Abstract: Functional blocks (a numerical control unit 22, servo control unit 26, PLC control unit 24, sizing control unit 23, sampling control unit 25, and display control unit 21) carry out their respective functions of control processing. Numerical control data, PLC control data, and sizing data as details of numerical control processing, PLC control processing, and sizing processing, respectively, are sampled and recorded by sampling control processing. The three kinds of recorded data are displayed together on one display unit 80 by display control processing when a display instruction is given by an operator of a control system 10 through an input control unit 90. Thus, an operator of the control system 10 can carry out the work of tracing the cause of the trouble of a machine tool 70 and of examining efficient machining processes of the machine tool 70 by simultaneously watching the control data displayed on one display unit 80. This provides a control system of the machine tool that can improve workability.

Abstract: Functional blocks (a numerical control unit 22, servo control unit 26, PLC control unit 24, sizing control unit 23, sampling control unit 25, and display control unit 21) carry out their respective functions of control processing. Numerical control data, PLC control data, and sizing data as details of numerical control processing, PLC control processing, and sizing processing, respectively, are sampled and recorded by sampling control processing. The three kinds of recorded data are displayed together on one display unit 80 by display control processing when a display instruction is given by an operator of a control system 10 through an input control unit 90. Thus, an operator of the control system 10 can carry out the work of tracing the cause of the trouble of a machine tool 70 and of examining efficient machining processes of the machine tool 70 by simultaneously watching the control data displayed on one display unit 80. This provides a control system of the machine tool that can improve workability.

Abstract: A numerical controller for a grinding machine, wherein one of plural reference sizing points is selected according to the contents of a numerical control program. Measured analog data indicating the diameter of a workpiece is received continuously to determine if the size of the machined workpiece coincides with the selected reference sizing point. Upon the coincidence of the size of the machined workpiece with the reference sizing point, a sizing signal is provided, and then machining control is changed in response to the sizing signal. An analog signal provided by a measuring device is sampled at a predetermined interval in a predetermined time. The analog signal is tested to see if the analog signal is in a predetermined range, which is decided based upon the temperature variation or vibrations of the grinding machine. And the result of the test is displayed to facilitate checking the output characteristics of the measuring device.

Abstract: An apparatus capable of automatically determining grinding wheel dressing timing for dressing a grinding wheel. The apparatus estimates the abrasion of the grinding wheel in a grinding cycle on the basis of machining data and grinding conditions, and divides the grinding cycle into a plurality of stages according to the estimated abrasion to carry out grinding wheel dressing after the completion of every stage of the grinding cycle. In grinding a workpiece having a plurality of ground sections, the abrasion of the grinding wheel in grinding each ground section is estimated, and the abrasion is accumulated in accordance with grinding sequence. A ground section after grinding which grinding wheel dressing is to be carried out is determined on the basis of the cumulative abrasion. Similarly, the abrasions are accumulated for each of workpieces. A grinding wheel dressing is carried out after the completion of grinding a workpiece so that the cumulative abrasion may not exceed a predetermined value.

Abstract: A data input-output device for an interactive numerical controller includes a key board having a set of numerical keys arranged to input data used for machining operations of a machine tool into a memory device, a first group of selection keys in the form of normal operation keys arranged to correct the input data in accordance with a workpiece to be machined, a second group of selection keys in the form of set-up change keys arranged to change process management data of the machining operations, a mode switch arranged to instruct the operation of the numerical controller, and a permission switch arranged to be turned on only by using an authorized key, and a central processing unit programmed to disable data input by manipulation of the second group of selection keys in a condition where the first group of selection keys is being manipulated and to permit the data input by manipulation of the second group of selection keys in a condition where the permission switch is turned on after the mode switch has been

Abstract: A grinding method for grinding non-circular workpiece such as a cam. The grinding wheel is moved according to the profile data defining profile generating movement of grinding wheel and cut-in feed data defining cut-in feed movement of the grinding wheel. In a part of each revolution of the workpiece, where the acceleration of the profile generating movement become zero or a negative value, the profile generating movement according to the profile data and the cut-in feed movement according to the cut-in feed data are executed simultaneously. Then, in the remainder of each revolution, the profile generating movement is executed without cut-in feed. The above-mentioned process is repeated alternately until the total amount of cut-in feed reaches a predetermined value.

Abstract: A numerical controller is provided wherein each time one data block of a numerical control program is transferred from a second buffer register to an active register, another data block successive thereto is transferred from a data storage device to a first buffer register and wherein a plunge infeed between a cylindrical workpiece and a grinding wheel of a grinding machine is effected in accordance with data block being stored in the active register. The numerical controller halts an automatic machining operation in response to a halt command of a data block in the active register. Compensation data is input during the halt of the automatic machining operation whereafter a restart command is input. The numerical controller modified feed command data of the numerical control program stored in the data storage device, based upon the compensation data.

Abstract: A computerized numerical controller for a grinding machine is provided with a memory device for storing a plurality of remachining operation programs and first and second data. Each of the operation programs in the memory device defines a grinding cycle pattern in which a tool support and a work table are to be moved for remachining one of previously finished portions of a workpiece rotatably carried on the work table. When the remachining of one portion of the workpiece is to be done for the purpose of correcting the dimension of the one portion, a manual data input device is manipulated to input the first data designating one of the remachining operation programs in addition to the second data indicative of feed amounts and rates through and at which the tool support and the work table are to be moved in accordance with one of the remachining operation programs designated by the first data.

Abstract: A numerical controller for a grinding machine composed of a central processing unit (CPU), which is programmed to read out a numerical control program block by block from a memory device and to control a pulse generation circuit to generate pulses of such number and frequency as determined by the read-out data block, for supply to feed servomechanisms of the grinding machine. The CPU is also programmed to execute a trouble identification routine and a trouble processing routine at predetermined time intervals. The trouble identification routine enables the CPU to identify the kinds of troubles occurring in the grinding machine and to assort the troubles into a number of trouble modes.

Abstract: An interactive data input device for a numerical control grinding machine is provided with a key board for inputting data which defines the shapes of a number of machining portions formed on a cylindrical workpiece and a central processing unit for controlling a display controller to display on a screen of a cathode ray tube (CRT) display unit the profile as taken along the workpiece axis, of each machining portion based upon the shape data input by the key board. The central processing unit is programmed to display, in addition to the profiles of the machining portions, the profile of a non-machining portion formed between two machining portions based upon the shape data for the two machining portions.

Abstract: A numerically controlled grinding machine equipped with two registers in which data concerning the positions of the cylindrical and shoulder grinding surfaces of a grinding wheel is stored. A reference point is established on the wheel spindle stock. A reference member having two reference surfaces is disposed on the worktable. The machine further includes a manual pulse generator for moving the grinding wheel head and the worktable, detectors for detecting the distances traveled by the wheel head and the worktable, a data entry device, an arithmetic processing unit, and a memory.

Abstract: A numerical controller for a grinding machine is provided with a memory device, a data processor, a data input device, a display device and a manual pulse generator. After the setting positions of a grinding wheel carrier, a tail stock and the like of the grinding machine are changed in connection with the replacement of a grinding wheel with new one and the change in kind of workpieces, the input device is manipulated to display a desired one of images on the display device. The manual pulse generator is then operated to move components such as the grinding wheel carrier and a work table to a state indicated by the displayed image, and a storage command switch of the input device is depressed. In response to this depression, the data processor reads the present positions of the components in the state displayed on the display device and calculates based upon the read present positions data which is used in numerically controlling a machining operation of the grinding machine.

Abstract: A feed control apparatus for a numerically controlled grinding machine having a work table movable in a first axis direction, a wheel head provided thereon with a grinding wheel of the angular type and movable in a second axis direction perpendicular to the first axis, wherein the feed control apparatus comprises a memory for storing an instruction for effecting relative movement between the work table and the wheel head, and command data indicative of a movement amount of the wheel head in the second axis direction, a computer for reading out the stored instruction and command data to calculate a movement amount of the work table on a basis of the read out command data and for producing first and second output signals respectively indicative of the movement amount of the wheel head and the calculated movement amount of the work table, and a feed mechanism responsive to the output signals from the computer for effecting the relative movement between the work table and the wheel head to move the grinding wheel

Abstract: In a numerical control grinding machine, movements of a wheel head and a work table respectively in first and second directions perpendicular to each other are controlled by reference to first and second present position registers which respectively represent positions of cylindrical and shoulder grinding surfaces of a grinding wheel rotatably carried on the work head. A reference member is secured to the work table, and a wheel head reference point is defined on the wheel head. A memory device stores data which represents positions in the first and second directions, of the wheel head reference point relative to a workpiece rotational axis and the reference member when the wheel head and the work table are at respective original positions. The memory device further stores data which represents positions in the first and second directions, of the cylindrical and shoulder grinding surfaces relative to the wheel head reference point.

Abstract: A method of grinding a curved corner portion of a workpiece by a grinding wheel having a curved edge surface whose radius is smaller than that of said curved corner portion. The grinding wheel is movable along a path extending at an acute angle to the axis of rotation of the workpiece. First, the grinding wheel is relatively moved to a first grinding start position. Then, the grinding wheel is moved inwardly to an advanced position along the path so as to perform a plunge grinding operation, and is subsequently retracted to the grinding start position. After that, the grinding wheel and the workpiece are relatively moved so as to move the grinding start position to the next grinding start position along a curved arc which is in parallel with the curved corner portion of the workpiece. The above plunge grinding operation is repeatedly performed from each grinding start position thereby grinding the curved corner position.

Abstract: A numerical controller for an angular slide grinding machine capable of controlling movement of a work table with a dressing tool in a machine coordinate system in a dressing operation and a workpiece coordinate system in a grinding operation. When the work table is initially moved to such a position as to bring the dressing tool into slight contact with an end surface of a grinding wheel carried by a wheel head, the numerical controller calculates and stores a dressing reference value indicating a positional relation between a fixed machine origination position and the dressing tool in the machine coordinate system. Prior to grinding operations for each workpiece, the work table is moved under the control of a sizing device to such a position as to present a reference surface of the workpiece to a predetermined positional relation with the original machine position.