With Means To Dampen Vibration Patents (Class 409/141)
  • Patent number: 10857599
    Abstract: A tool for a boring machine includes an elongated elongated body extending longitudinally from a proximal end to a distal end, the distal end being shaped to receive a cutting tip, and a cavity inside the body. The tool includes a lattice provided within the cavity and a powder provided in the cavity with the lattice.
    Type: Grant
    Filed: January 15, 2019
    Date of Patent: December 8, 2020
    Assignee: Caterpiller Inc.
    Inventors: Thierry A. Marchione, Kevin L. Martin, Rohit A. Bhapkar
  • Patent number: 10836011
    Abstract: The present application discloses a single-point diamond dresser for a grinding wheel based on acoustic emission online monitoring, which includes a support module, an anti-interference module, a compression cooling module and an acoustic emission online monitoring module. An acoustic emission sensor monitors the dressing state of the grinding wheel online; a damping sheet and a damping interlayer greatly reduce external noise interference; a high pressure coolant causes an upward elastic deformation of an elastic spacer and the damping sheet, enlarging a contact force between the acoustic emission sensor and the core and moreover improving a sensitivity of the acoustic emission sensor; the coolant flows through the coolant passages in the core to cool a dressing area; current limiting passages, pressure relief cavities and perforated pressure-relief plates limit flow and reduce a pressure of the coolant, reducing the interference of the coolant on the grinding wheel dressing.
    Type: Grant
    Filed: January 11, 2020
    Date of Patent: November 17, 2020
    Assignee: Changsha University of Science and Technology
    Inventors: Cong Mao, Yongle Hu, Linfeng Xiao, Kun Tang, Mingjun Zhang, Zhikang Zhang, Lairong Yin
  • Patent number: 10802461
    Abstract: A controller for a machine tool is configured to shred chips in thread cutting. The controller includes a processor that calculates an oscillation amplitude and an oscillation direction for shredding the chips from lathe-turning machining. The chip shredding is based on an infeed amount in a radial direction of a work and a shift amount in a circumferential direction of the work relative to a last machining path of a tool used for the lathe-turning machining on the work. The processor also calculates an oscillation command for causing the work and the tool to oscillate relative to each other based on the calculated oscillation amplitude and the oscillation direction. The processor then adds a movement command for moving the work and the tool relative to each other for the machining and the oscillation command.
    Type: Grant
    Filed: April 8, 2019
    Date of Patent: October 13, 2020
    Assignee: FANUC CORPORATION
    Inventor: Kenta Yamamoto
  • Patent number: 9833868
    Abstract: A chatter avoidance method and device is provided, including steps of: providing a stable operating condition plot; partially removing a first layer of a workpiece with a predetermined first removal depth according to a safe removal depth of the stable operating condition plot and sensing a chatter caused by the removal operation; if no chatter is sensed, completing the removal operation, otherwise, continuing to partially remove the first layer with a second removal depth less than the predetermined first removal depth; and determining a minimum removal depth according to the removal operation, and removing a last layer of the workpiece with a last removal depth less than or equal to the minimum removal depth, allowing the workpiece to have a target thickness. The disclosure prevents a chatter from continuously occurring without requiring a shut-down and thereby maintains a desired production rate.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: December 5, 2017
    Assignee: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Tsung-Ling Hwang, Chin-Te Lin, Shuo-Peng Liang, Ta-Jen Peng, Jen-Ji Wang, Tzuo-Liang Luo
  • Patent number: 9588512
    Abstract: Disclosed is a setting method of revolutions per minute on a real time of a rotating cutting tool, and a control device, and more particularly, a vibration characteristic is consistently evaluated and analyzed when a cutting process is in progress to suppress and avoid suppression.
    Type: Grant
    Filed: June 10, 2014
    Date of Patent: March 7, 2017
    Assignee: Doosan Machine Tools Co., Ltd.
    Inventors: Kang Jae Lee, Jin Suk Song
  • Patent number: 9382805
    Abstract: A balanced rotor comprising a circumferential slot and a plurality of aerofoils each secured in the slot by a respective root, the root having a root block having circumferentially facing flanks and a seal wing extending circumferentially from one of the flanks, characterized in that the seal wing has a notch engaging a balance weight positioned between adjacent roots.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: July 5, 2016
    Assignee: ROLLS-ROYCE plc
    Inventor: Alexander Lewis Shaw
  • Patent number: 9085081
    Abstract: A representative machine comprises a non-rigid robotic device having a tool head; and a rigid inertial stiffening system that is part of a tool head and includes a mass to provide precise position of the tool head. The rigid inertial stiffening system achieves high positional precision of the tool head, in the face of large disturbing forces by locally accelerating the mass to counter the disturbing forces.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: July 21, 2015
    Inventor: Stephen Lang Dickerson
  • Patent number: 9027720
    Abstract: A vibration damping mechanism allows increase of an absorption amount of vibration energy, with less possibilities of increase in the manufacture cost of a vibration damping weight and of reduction in the strength of a shaft section. Within a cylindrical hollow portion formed inside the shaft section, there are accommodated a plurality of weight members divided from each other along the circumferential direction about the axis of the hollow portion. An urging member is provided for urging the weight members toward the axis such that dividing faces of adjacent weight members are brought into surface contact with each other.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: May 12, 2015
    Assignee: Daishowa Seiki Kabushiki Kaisha
    Inventor: Tatsuya Ogata
  • Patent number: 9016988
    Abstract: To provide a tool holder that is capable of exerting a vibration-minimizing effect in a reliable manner using a simple configuration and that is extremely useful for practical application.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: April 28, 2015
    Assignee: Yukiwa Seiko Kabushiki Kaisha
    Inventors: Kazuo Sakamaki, Koichi Takizawa, Tomokazu Seki, Isao Sakamaki
  • Patent number: 9011052
    Abstract: In a machine tool having a rotary shaft for use in rotating a tool or a workpiece, a plurality of stable rotation speeds at which the chatter vibrations are expected to be suppressed, and at least one switching rotation speed across which a dynamic characteristic of a rotary shaft system changes are stored. The plurality of stable rotation speeds may be determined from chatter vibrations detected using a vibration detection unit. Optimum rotation speed that is a rotation speed to which a rotation speed of the rotary shaft is changeable without crossing the switching rotation speed is selected from the plurality of stable rotation speeds, and the rotation speed of the rotary shaft is changed to the optimum rotation speed. Thus, chatter vibrations generated during rotation of the rotary shaft can be suppressed effectively.
    Type: Grant
    Filed: September 26, 2011
    Date of Patent: April 21, 2015
    Assignee: Okuma Corporation
    Inventor: Hiroshi Ueno
  • Patent number: 8967927
    Abstract: The table on which a workpiece is put can travel on a guide rail mechanism relative to a working head with a cutting tool mounted thereon. The table is connected through a nut to a ball screw part to move in an axial direction thereof as the ball screw part rotates. One end of the ball screw part is supported by a bearing and the other end is connected to a servomotor to be rotationally driven. A hollow part is provided in the table to receive therein a damper mechanism part, which comprises a spring, a damper, and a weight, the table and the weight being arranged to enable traveling separately on guide rails. Thereby, even when the workpiece is heavy, the weight can move relative to the table to effectively damp vibrations of the table in a feed direction.
    Type: Grant
    Filed: July 2, 2010
    Date of Patent: March 3, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Hideaki Onozuka, Koji Utsumi, Toshio Yamanaka, Masayuki Kyoi
  • Patent number: 8959766
    Abstract: In a method for machining grooves, especially fir-tree grooves (13), which are provided for accommodating blades (19), on a rotor (10) of a turbine, especially a low-pressure steam turbine, great simplification and high flexibility is achieved by the fact that in the grooves, or fir-tree grooves (13), material is removed by a program-controlled milling device, wherein the milling device is inserted into the groove, or fir-tree groove (13), with a milling tool (20) which is guided along the places in the groove, or fir-tree groove (13), which are to be machined, by a milling tool positioning device, which is freely movable in space.
    Type: Grant
    Filed: March 10, 2010
    Date of Patent: February 24, 2015
    Assignee: Alstom Technology Ltd
    Inventors: Wilfried Storch, Stephan Fiedler, Björn Heucke, Michael Schwaar, Thomas Jaehnert, Günter Gnirss
  • Patent number: 8956092
    Abstract: Device and method for milling of materials including a milling cutter body including a first end portion and an opposite second end portion. The first end portion is connected to a rotatable spindle and the second end portion is provided with at least one cutting edge. The milling cutter body defines a longitudinal axis and is provided with an axial recess, wherein at least one mass element is arranged in the recess. The axial position of the mass element in relation to the milling cutter body is tuned by use of tuning members included in the device for the tuning of the natural frequency of the device. The mass element is axially locked in relation to the milling cutter body by use of lock members included in the device, in order to optimize the natural frequency of the device for the milling operation in question.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: February 17, 2015
    Assignee: Sandvik Intellectual Property AB
    Inventors: Mikael Lundblad, Anders Liljerehn
  • Patent number: 8914957
    Abstract: A capsule type reconfigurable multifunctional machining apparatus is disclosed. A capsule type reconfigurable multifunctional machining apparatus includes a rotating frame in which a plurality of processing modules may be installed to face an object to be machined disposed in a capsule type body and whose machining position and pose are controlled by rotation, a top frame for rotatably supporting the rotating frame, a bottom frame that is combined with the top frame under the top frame to support the top frame and in which vibration proof members are installed in positions where the bottom frame contacts the top frame, and a stage unit fixedly inserted into the internal center of the top frame to settle the object to be machined so that the height of the settled object to be machined may be controlled and in which an X-Y stage or a rotary stage may be selectively mounted.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: December 23, 2014
    Assignee: Korea Institute of Machinery & Materials
    Inventors: Jong-Kweon Park, Sung Cheul Lee, Byung-Sub Kim, Seung Kook Ro, Sung Kwon Jang
  • Patent number: 8899890
    Abstract: Disclosed is a 3D reconfigurable machining system including a support frame spaced apart from the ground, a circular pivoting frame pivotably installed at the support frame, a slide member slidably installed on the circumferential portion of the pivoting frame, and a main spindle installed vertically at the slide member and being rotatable along the pivoting frame, so that a workpiece can be three-dimensionally machined with a considerably simple structure.
    Type: Grant
    Filed: May 12, 2011
    Date of Patent: December 2, 2014
    Assignee: Korea Institute of Machinery & Materials
    Inventors: Jong-Kweon Park, Seung-Kook Ro, Byung-Sub Kim, Gyung-Ho Khim, Sung-Cheul Lee, Hyeon-Hwa Lee, Byung-In Kim
  • Patent number: 8895160
    Abstract: The present invention provides an appliance for chip removal applications comprising a vibration-damping material wherein the vibration-damping material is a material arranged by nano-dimensional cluster form. The present invention additionally provides a method for manufacturing said appliance. The present invention provides also an appliance obtainable by said method. Additionally the present invention provides an article or work piece for use in an appliance for chip removal applications. Also a computer program is provided for controlling the above method.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: November 25, 2014
    Assignee: Mircona AB
    Inventors: Ragnhild Mihic, Peter Mihic
  • Patent number: 8874255
    Abstract: A method of control of rotation of a spindle device and a control system of a machine tool which enable machining without generation of chatter vibration without using special tools of variable pitch cutting edges or chatter vibration detecting means. The method of control of rotation of a spindle device and control system of a machine tool according to the present invention store spindle rotational speed change data, which determines how to change a rotational speed of a spindle in accordance with an instructed speed, linked with machining conditions and stability limit data, select, from an instructed spindle rotational speed and machining conditions and the stored stability limit data, spindle rotational speed change data giving less vibration, and use the selected spindle rotational speed change data as the basis to change the rotational speed of the spindle.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: October 28, 2014
    Assignee: Makino Milling Machine Co., Ltd.
    Inventors: Ryoichi Miyamoto, Haruka Nagahara, Sumie Nagahara, Osamu Nagahara
  • Patent number: 8845245
    Abstract: A dampened spindle cartridge and a dampened spindle adaptor are provided for damping tool vibrations during operation of a machine tool. Damping media is arranged inside a cavity formed within the spindle adaptor or the spindle cartridge. The damping media may be a solid aggregate, such as steel shot or sand, or a viscous fluid, such as oil. The damping media attenuates and/or converts tool vibrations into friction and heat, thereby dissipating vibration energy generated during cutting operations performed by the machine tool and prevents reinforcement of the forced vibration.
    Type: Grant
    Filed: September 8, 2010
    Date of Patent: September 30, 2014
    Assignee: Haas Automation, Inc.
    Inventors: Gene F. Haas, Fred G. Eubanks, Peter A. Kiss, Curt J. Gelderman
  • Patent number: 8827609
    Abstract: The damping property of a rear rolling bearing (133) is adjusted by controlling a damping force that is applied by damping application means (5, 134) based on, for example, the type of a tool (T). Thus, it is possible to provide the optimum damping properties for various tools that differ in natural vibration, and to suppress the generation of chattering of the various tools. As a result, it is possible to increase the cut amount per unit time to increase the productivity.
    Type: Grant
    Filed: October 6, 2010
    Date of Patent: September 9, 2014
    Assignee: JTEKT Corporation
    Inventors: Kazunari Ogura, Nobumitsu Hori, Kunimichi Nakashima, Yuji Okawa, Takamasa Shibata
  • Patent number: 8820496
    Abstract: A damper includes at least one substantially longitudinal damping body with two end surfaces and one substantially longitudinal surface between. The damping body is placed in a substantially longitudinal cavity, which includes a cavity surface, with a damping fluid that includes a liquid and a gas. At least one of the cavity surface, end surfaces or longitudinal surface is broken, and the damping body can pulsate in the cavity when the damper is in operation.
    Type: Grant
    Filed: September 5, 2007
    Date of Patent: September 2, 2014
    Assignee: Teeness ASA
    Inventors: Anders Digernes, Arne Martin Nordmark, Roger Olsen
  • Patent number: 8801345
    Abstract: A tool main spindle, whose cutting angle can be changed, is translated by an X-axis moving mechanism portion on an X-axis provided in a plane perpendicular to an axis of a work; and is translated on a Y-axis by a Y-axis moving mechanism portion. Cutting of the work is performed by setting the cutting angle of the tool main spindle to an angle of the cutting tool at which the work has large dynamic rigidity, and causing an axis of a cutting tool to cross the work axis, and cutting the work with the cutting tool toward the axis of the work by cooperatively operating the X-axis moving mechanism portion and the Y-axis moving mechanism portion.
    Type: Grant
    Filed: June 11, 2009
    Date of Patent: August 12, 2014
    Assignee: Okuma Corporation
    Inventor: Kiyoshi Yoshino
  • Patent number: 8784016
    Abstract: A rotary cutting tool includes a cutter body having a head, a shank, and a cavity extending along a central, longitudinal axis of the cutter body. The head includes at least one cutting insert mounted in a pocket adjacent to a chip groove. A vibration damping device is disposed within the cavity. The vibration damping device includes a stop member, a threaded fastener, weight elements, and a biasing member. At least one, if not all of the weight elements have different outside diameters to cause the weight elements to vibrate in the cavity at different frequencies. At least some of the frequencies of the weight elements are different than a fundamental chatter frequency of the cutting tool, thereby dampening vibration of the rotary cutting tool during a machining operation.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: July 22, 2014
    Assignee: Kennametal Inc.
    Inventor: Kevin Michael Gamble
  • Patent number: 8776342
    Abstract: A module for on-line vibration detection and adjustment and machining center using the same are provided in the present invention, wherein the module is disposed at the machining center having an interface of feedrate override and an interface of spindle override and the inverter. The module comprises at least one vibration sensor for detecting the vibrating status of the machining center, thereby generating corresponding at least one sensing signal and a processor for processing the at least one sensing signal so as to generate a spindle adjusting signal for the interface of spindle override and the inverter and a feedrate adjusting signal for the interface of the federate override. The computer numerical controller receives the spindle adjusting signal and the feedrate adjusting signal from the interface of the spindle override and federate override respectively and accordingly controls the feedrate and spindle rate of the machining center.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: July 15, 2014
    Assignee: Industrial Technology Research Institute
    Inventors: Tzu-Hsin Kuo, Chun-Hung Huang
  • Patent number: 8734070
    Abstract: A toolholder includes a body portion having an exterior surface and a dynamic absorber mounted on the exterior surface of the body portion. The dynamic absorber includes a rigid support member, a cover member, and an absorber mass disposed within a cavity formed by the rigid support member and the cover member. A first resilient support member is disposed between the rigid support member and the absorber mass, and a second resilient support member is disposed between the cover member and the absorber mass. The dynamic absorber is tuned by moving the cover member relative to the rigid support member. A method of suppressing vibrations of the toolholder includes externally mounting the dynamic absorber on the exterior surface of the toolholder.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: May 27, 2014
    Assignee: Kennametal Inc.
    Inventor: Ruy Frota De Souza Filho
  • Patent number: 8708620
    Abstract: A tool holder is provided that prevents chattering in a large-sized cutting tool. A tool holder 1 includes an anti-vibration device provided in a radially outer portion of a body. The anti-vibration device has a ring-shaped first anti-vibration member and a second anti-vibration member. The anti-vibration device is fixed to the body together with a cutting tool T1 by means of a bolt. Four O-rings are arranged on both sides of the first anti-vibration member, and the damper property is adjusted by pressing a pressing plate with adjuster bolts. An appropriate gap is formed between the first anti-vibration member and the body and between the first anti-vibration member and the second anti-vibration member.
    Type: Grant
    Filed: December 1, 2009
    Date of Patent: April 29, 2014
    Assignee: Yamazaki Mazak Corporation
    Inventors: Takaaki Sasaki, Tsunekazu Ishida
  • Patent number: 8708622
    Abstract: Gearwheel cutting machine for machining the tooth flanks of gearwheels (1), comprising chucking means (20) for chucking a workpiece (1) to be machined; a gear cutting tool; and a flat, ring-shaped vibration-damping element (21) insertable in the area of the chucking means (20) during the chucking of the workpiece (1) to be machined, the ring-shaped vibration-damping element (21) being provided in order to suppress or damp vibrations.
    Type: Grant
    Filed: June 2, 2010
    Date of Patent: April 29, 2014
    Assignee: Klingelnberg AG
    Inventor: Jürgen Weber
  • Publication number: 20140105701
    Abstract: An anti-vibration member is provided which includes a member main body having rubber elasticity or viscoelasticity and can be mounted on an outer surface of a tool main body by a frictional force against the outer surface.
    Type: Application
    Filed: July 13, 2012
    Publication date: April 17, 2014
    Inventors: Kazuya Matano, Rimpei Kawashita
  • Publication number: 20140093322
    Abstract: The invention relates to a device (1) and a method, comprising a workpiece-receiving portion (2) for receiving a workpiece (28) to be mechanically machined. At least one vibrating device (9) is connected to the workpiece-receiving portion (2), and the vibrating device (9) causes the workpiece-receiving portion (2) to vibrate, the vibration of the workpiece-receiving portion (2) having a frequency that is lower than the frequency of ultrasound. The vibrating device (9) has a vibrating body (8) to which a compensating mass (7) that vibrates in the opposite direction is associated.
    Type: Application
    Filed: May 18, 2012
    Publication date: April 3, 2014
    Applicant: TECHNISCHE UNIVERSITAT WIEN
    Inventors: Friedrich Bleicher, Johannes Bernreiter
  • Publication number: 20130309034
    Abstract: An apparatus includes an external input device that allows setting of the amount of runout and the phase of each cutting edge, a computation device that acquires the rotational phase of a tool and that computes the angular velocity and the phase of vibration of two, X-axis and Y-axis, feed shafts on the basis of the input amount of runout and angular velocity of each cutting edge to generate a feed shaft control signal, and a numerical control device that controls feed in the X-axis and the Y-axis directions. The numerical control device relatively vibrates a workpiece in synchronization with the angular velocity of the tool on the basis of the results of computation performed by the computation device.
    Type: Application
    Filed: March 11, 2013
    Publication date: November 21, 2013
    Applicant: OKUMA CORPORATION
    Inventors: Hiroshi INAGAKI, Toshiya SHIKAMA
  • Patent number: 8579562
    Abstract: A tool holder (10) for a tool which can rotate about an axis of rotation (D) comprises a clamping shank (18) which, in an end shank region, has a clamping formation (14) with an accommodating opening (16) which is central in relation to the axis of rotation (D) and is intended for accommodating a retaining shank of the tool, there being provided, on the lateral circumference of the accommodating opening (16), at least one clamping surface for securing the retaining shank of the tool with press-fit action. According to the invention, on an axial section which forms an axial bracing section (VA), the tool holder (10) has a bracing arrangement (20) which, at least during operation of the tool holder (10), subjects the tool holder (10) to a bracing force (Vk) with a bracing force component (Vk) acting in the axial direction.
    Type: Grant
    Filed: January 14, 2005
    Date of Patent: November 12, 2013
    Assignee: Franz Haimer Maschinenbau KG
    Inventors: Franz Haimer, Josef Haimer, Hermann Kopp
  • Patent number: 8529173
    Abstract: A method to adjust a modal property of a material removal tool without changing a projection length of the material removal tool is disclosed. Adjusting substantially aligns a characteristic frequency of the material removal tool with a rotation speed of a spindle of a machine tool. A material removal tool employing the method and a method to machine metal are also disclosed.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: September 10, 2013
    Assignee: Valenite, LLC
    Inventor: Brian D. Hoefler
  • Patent number: 8522419
    Abstract: Techniques and apparatuses to provide vibration reduction of a workpiece when performing machining operations are disclosed. In various embodiments, a machine tool includes a shank having at least one end configured for engagement with a machine operable to rotate the shank. A cutting portion has a diameter defined by features used to remove material from a workpiece. The cutting portion is coupled to the shank. A vibration reduction dampener may be located between the shank and the workpiece.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: September 3, 2013
    Assignee: The Boeing Company
    Inventors: Jared L. Bolin, Ryan L. Hanks, Eric J. Stern
  • Patent number: 8439369
    Abstract: A shrink-fit chuck tool holder which comprises: clamping means which are provided centrally with respect to an axis of rotation of the tool holder for holding a shank of a rotary tool, and which define a receiving opening for the shank. The clamping means can be displaced in the radial direction between a release position for insertion or removal of the shank and a clamping position. The clamping means are assigned a clamping surface with a cylindrical contour which, in the clamping position, bears against the outer circumferential surface of the shank. The clamping surface has a helical groove surrounding the axis of rotation or a multiplicity of annular grooves surrounding the axis of rotation, which as seen in the direction of the axis of rotation project towards the axis of rotation and the roof surfaces of which form the clamping surface.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: May 14, 2013
    Inventor: Franz Haimer
  • Patent number: 8430610
    Abstract: Chattering suppression apparatus (10) comprises multiple bolt members (24a through 24d) for mounting boring bar (20) in the spindle (18). Inside the main body configuring bolt members (24a through 24d), a damper chamber (34) is formed and, inside the damper chamber (34), a friction damper section (36) that suppresses the vibration energy that can cause chatters during machining operation of workpiece W, through sliding friction, is housed in the movable state.
    Type: Grant
    Filed: January 26, 2007
    Date of Patent: April 30, 2013
    Assignee: NT Engineering Kabushiki Kaisha
    Inventor: Yasuhiro Komai
  • Patent number: 8398342
    Abstract: Techniques and apparatuses to provide vibration reduction of a workpiece when performing machining operations are disclosed. In various embodiments, a machine tool includes a shank having at least one end configured for engagement with a machine operable to rotate the shank. A cutting portion has a diameter defined by features used to remove material from a workpiece. The cutting portion is coupled to the shank. A vibration reduction dampener may be located between the shank and the workpiece.
    Type: Grant
    Filed: January 5, 2009
    Date of Patent: March 19, 2013
    Assignee: The Boeing Company
    Inventors: Jared L. Bolin, Ryan L. Hanks, Eric J. Stern
  • Patent number: 8374717
    Abstract: A vibration suppressing method and a vibration suppressing device are disclosed. After a tool is attached to a main spindle, a modal parameter of the tool or a workpiece is computed. Thereafter, a relation between chatter frequency and phase difference is calculated as an approximation formula based on the obtained modal parameter and machining conditions. If chatter vibration occurs after initiation of the machining, a chatter frequency corresponding to a target phase difference is obtained using the approximation formula, and based on the obtained chatter frequency, the number of tool flutes and the main spindle rotation speed, the optimum rotation speed is calculated. The rotation speed of the main spindle is then changed in accordance with the obtained optimum rotation speed.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: February 12, 2013
    Assignees: Okuma Corporation, National University Corporation Nagoya University
    Inventors: Norikazu Suzuki, Eiji Shamoto, Hiroshi Ueno
  • Patent number: 8360697
    Abstract: The invention relates to a method of reducing vibrations, occurring during a machining operation, of a machine element (7,8) and/or of a workpiece (5) in a machine tool, production machine and/or in a machine (1) designed as a robot, wherein an additional mass (9a, 9b, 9c) is attached to the machine element (7,8) and/or to the workpiece (5) in an automated manner, wherein the mass of the additional mass (9a, 9b, 9c) is adapted to the machining operation. Furthermore, the invention relates to a machine (1) in this respect. The invention enables vibrations, occurring during a machining operation, of a machine element (7,8) of a machine (1) and/or of a workpiece (5) to be reduced.
    Type: Grant
    Filed: October 19, 2006
    Date of Patent: January 29, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventors: Jens Hamann, Elmar Schäfers, Hans-Peter Tröndle, Bernd Wedel
  • Publication number: 20130004250
    Abstract: A rotary cutting tool includes a cutter body having a head, a shank, and a cavity extending along a central, longitudinal axis of the cutter body. The head includes at least one cutting insert mounted in a pocket adjacent to a chip groove. A vibration damping device is disposed within the cavity. The vibration damping device includes a stop member, a threaded fastener, weight elements, and a biasing member. At least one, if not all of the weight elements have different outside diameters to cause the weight elements to vibrate in the cavity at different frequencies. At least some of the frequencies of the weight elements are different than a fundamental chatter frequency of the cutting tool, thereby dampening vibration of the rotary cutting tool during a machining operation.
    Type: Application
    Filed: July 1, 2011
    Publication date: January 3, 2013
    Applicant: KENNAMETAL INC.
    Inventor: Kevin Michael Gamble
  • Patent number: 8317440
    Abstract: The invention relates to a method for optimizing vibration of a machine tool, in which a driven shaft is rotated, in which a speed range is subsequently passed through, wherein the vibrations occurring in said speed range are sensed and wherein an optimum speed having a minimized vibration is determined and adjusted.
    Type: Grant
    Filed: April 6, 2006
    Date of Patent: November 27, 2012
    Assignee: P & L GmbH & Co. KG
    Inventor: Jürgen Röders
  • Patent number: 8308404
    Abstract: The present invention relates to a tool holder, such as a reaming head (1), or a milling arbor, provided with a damping means (2) in the form of an elongated body, which is arranged in an end compartment (3) of the tool holder (1), which compartment is of appropriate shape and size, and closed at its end by a body (4) for receiving a reaming head or by a milling element. Tool holder characterized in that the damping means (2) is of the type presenting only radial absorption, and it is provided with at least one elastically deformable means (5), at least close to each end, where said elastically deformable means (5) extend between the envelope of the damping means (2) and the wall of the compartment (3) of the tool holder (1), and are clamped between the wall of the compartment (3) and the damping means (2), and where the ends of the damping means extend in the compartment (3) without stress.
    Type: Grant
    Filed: April 9, 2009
    Date of Patent: November 13, 2012
    Assignee: E.P.B.
    Inventors: Mathieu Ostermann, Alain Freyermuth
  • Patent number: 8308405
    Abstract: A cutter holder has a holder body and a sleeve. The holder body has a first end, a middle, an insert part and a mounting part. The insert part is formed on the first end. The mounting part is formed on the middle of the holder body and has an outer thread formed around the mounting part. The sleeve is mounted around the mounting part and has an inner thread, multiple screw holes and multiple setscrews. The inner thread is formed on an inner surface of the sleeve, is screwed with the outer thread of the mounting part. The screw holes are separately defined through the sleeve. The setscrews are mounted in the screw holes and abut the mounting part.
    Type: Grant
    Filed: July 23, 2009
    Date of Patent: November 13, 2012
    Inventor: Chin-Chiu Chen
  • Patent number: 8286972
    Abstract: The present invention relates to a low-vibration tool holder (1) with a tool holder base body (2, 3, 4, 6) and a tensioning arrangement (5) which provides axial tensioning of the tool holder base body (2, 3, 4, 6) and which is simultaneously tensioned in a radially flexible way with respect to the tool holder base body (2, 3, 4, 6). This tool holder (1) is less susceptible to vibration than previously known tool holders, which ensures better true running even during operation and in particular when heat-induced expansion of materials occurs, since the clamping arrangement (5) which is integrated in the tool holder (1) is continuously centered with respect to the tool holder base body (2, 3, 4, 6). Furthermore, such a tool holder (1), in particular within a modular design, can be adapted very flexibly to different types of tools and workpiece machining processes.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: October 16, 2012
    Assignee: Franz Haimer Maschinenbau KG
    Inventor: Franz Haimer
  • Patent number: 8256590
    Abstract: A vibration suppressing device and a vibration suppressing method that are capable of obtaining an accurate optimum rotation speed and shortening a time period from generation of chatter vibration to calculation of the optimum rotation speed are provided. The vibration suppressing device includes: vibration sensors for detecting time-domain vibrational accelerations of a rotary shaft in rotation; and a control device for calculating a chatter frequency and a frequency-domain vibrational acceleration of the rotary shaft at the chatter frequency on the basis of the time-domain vibrational accelerations detected by the vibration sensors, and when the calculated frequency-domain vibrational acceleration exceeds a predetermined threshold value, calculating an optimum rotation speed on the basis of a predetermined parameter, and rotating the rotary shaft at the calculated optimum rotation speed.
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: September 4, 2012
    Assignees: Okuma Corporation, National University Corporation Nagoya University
    Inventors: Norikazu Suzuki, Eiji Shamoto, Hiroshi Inagaki
  • Publication number: 20120207560
    Abstract: To provide a tool holder that is capable of exerting a vibration-minimizing effect in a reliable manner using a simple configuration and that is extremely useful for practical application.
    Type: Application
    Filed: October 19, 2010
    Publication date: August 16, 2012
    Applicant: YUKIWA SEIKO KABUSHIKI KAISHA
    Inventors: Kazuo Sakamaki, Akira Sakamaki, Isao Sakamaki, Koichi Takizawa, Tomokazu Seki
  • Patent number: 8240961
    Abstract: A tool holder 1 has a shaft 2 intended to be arranged in a tool holder in a manufacturing machine, a head 3 on which a cutter is intended to be arranged and a vibration-damping material 4 arranged between, and attached to, the shaft 2 and the head 3 such that the cutter is in contact with the manufacturing machine solely through the vibration-damping material 4, where the vibration-damping material is a metal or an alloy of metals selected from the group consisting of Cu, Ti, Zn, Al and Ni. A method for manufacturing a tool holder in which the surface covering of vibration-damping material is created by electrochemical pulse plating through the tool holder, when functioning as an electrode, being lowered into an electrolyte containing ions of at least one metal selected from the group consisting of Cu, Ti, Zn, Al and Ni.
    Type: Grant
    Filed: May 6, 2005
    Date of Patent: August 14, 2012
    Assignee: Mircona AB
    Inventor: Peter Mihic
  • Publication number: 20120121349
    Abstract: The present invention provides an appliance for chip removal applications comprising a vibration-damping material wherein the vibration-damping material is a material arranged by nano-dimensional cluster form. The present invention additionally provides a method for manufacturing said appliance. The present invention provides also an appliance obtainable by said method. Additionally the present invention provides an article or work piece for use in an appliance for chip removal applications. Also a computer program is provided for controlling the above method.
    Type: Application
    Filed: September 29, 2008
    Publication date: May 17, 2012
    Inventors: Ragnhild Mihic, Peter Mihic
  • Publication number: 20120099940
    Abstract: A toolholder includes a body portion having an exterior surface and a dynamic absorber mounted on the exterior surface of the body portion. The dynamic absorber includes a rigid support member, a cover member, and an absorber mass disposed within a cavity formed by the rigid support member and the cover member. A first resilient support member is disposed between the rigid support member and the absorber mass, and a second resilient support member is disposed between the cover member and the absorber mass. The dynamic absorber is tuned by moving the cover member relative to the rigid support member. A method of suppressing vibrations of the toolholder includes externally mounting the dynamic absorber on the exterior surface of the toolholder.
    Type: Application
    Filed: October 20, 2010
    Publication date: April 26, 2012
    Applicant: KENNAMETAL INC.
    Inventor: Ruy Frota de Souza Filho
  • Patent number: 8157252
    Abstract: The invention relates to a machine tool, wherein the machine tool has a workpiece clamping device (10) for clamping a workpiece (9), wherein the workpiece clamping device (10) and in this way the workpiece (9) can be moved by means of a piezoactuator (11a, 11b, 11c, 11d). The invention furthermore relates to a corresponding method. The invention provides a machine tool in which vibrations occurring during a machining operation are reduced.
    Type: Grant
    Filed: October 17, 2007
    Date of Patent: April 17, 2012
    Assignee: Siemens Aktiengesellschaft
    Inventors: Uwe Ladra, Gabriele Schmitt-Braess, Elmar Schäfers
  • Patent number: 8142118
    Abstract: The invention refers to a working machine with a machining tool which can be set in a spindle head of a working spindle. A monitoring unit is provided which monitors the shape of the spindle head.
    Type: Grant
    Filed: August 15, 2007
    Date of Patent: March 27, 2012
    Assignee: Grob-Werke GmbH & Co. KG
    Inventor: Knut Martens
  • Patent number: RE44056
    Abstract: An improved attenuator for damping vibrations and noise when disc brake rotors are being machined in a machining lathe. The improved attenuator has a handle comprised of a squared end with legs extending at angle of 100° to the squared end toward each other. Damping pads are mounted on the ends of the legs to press against the surfaces of the rotor being machined. The 100° angle of the legs toward each other improves the biasing force against the rotor surfaces. Additionally, the damping pads are provided with a notch that fits around and over the tips of cutting bits of the machining lathe to securely hold the pressure pads in place. Another improvement includes a fastening strap attached to the squared end of the handle that wraps around a biasing spring and the carriage on the machining lathe to securely hold and maintain the position of the attenuator.
    Type: Grant
    Filed: September 1, 2005
    Date of Patent: March 12, 2013
    Inventor: Brian K. Sipe