Abstract: A rotary cutter includes a shaft adapted to be mounted on a support and defining a longitudinal axis. The shaft includes a bore extending inwardly into the shaft, and a channel extending into the shaft and intersecting the bore. A roller body, having cutting elements, is mounted on the shaft for rotation relative thereto about the axis. Bearings are disposed between the roller body and the shaft, the bearings communicating with the bore. The cutter is lubricated by inserting a filling plug into the bore and forcing lubricant therethrough and into the bearings. The filling plug is then removed from the bore, leaving the bore generally free of lubricant. A hollow cylindrical member and a flexible diaphragm are inserted into the bore, and a nozzle is inserted through the channel for introducing lubricant into the bore. The nozzle is then removed from the channel, and the channel is plugged. The diaphragm flexes inwardly and outwardly in response to variations in external and internal pressures.

Abstract: An overburden drilling device includes a drill bit body, a percussion element for applying impacts to the body, and a casing attached to the body. The casing is connected to the drill bit body by a casing shoe which comprises semi-cylindrical halves which are held together by a circular ring that is welded to the halves. The casing shoe and the drill bit body are interconnected by radially overlapping walls so that the drill bit body pulls the casing along during a drilling operation.

Abstract: A wear resistant, diamond enhanced cutting tool for excavating is disclosed. The cutting tool includes a cutting insert having a diamond coated cutting tip brazed to the cutting insert. The cutting tool is formed by brazing the insert to a tool body with a braze alloy by heating the insert and tool body to a temperature at which the braze alloy melts. The insert and tool body are then cooled to solidify the braze alloy and quenched to cause a martensitic transformation. Finally, the diamond enhanced tip is brazed to the insert while the temperature of the tool body is maintained below a temperature at which the tool body would soften. According to this method, the cutting tool is formed without creating a tempered zone of reduced hardness.

Abstract: A body is disclosed with a coating comprising one or more refractory layers of which one layer is an outermost smooth, shiny 110-textured .alpha.-Al.sub.2 O.sub.3 layer. Said A1.sub.2 0.sub.3 layer has a surface appearance almost like a polished A1.sub.2 0.sub.3 layer. Coated tools show improved tool lives compared to prior art tools when used for machining steel or cast iron material preferably for near net shape machining.

Abstract: A bandsaw blade includes recurring groups of cutting tooth structures which are of progressively shorter height from a leading tooth structure to a trailing tooth structure. Each of the tooth structures is either: (A) a single, straight tooth, or (B) a pair of equal-height set teeth which are set to respective sides of the blade. The leading tooth structure consists of a single straight tooth having relatively large chamfers. The last tooth structure consists of a pair of non-chamfered set teeth. The next-to-last tooth structure is either a straight, chamfered tooth or a pair of chamfered, set teeth.

Abstract: A new austenitic stainless steel comprising in % by weight:C: <0.12,Si: <1.0,Cr: 16-22,Mn: <2.0,Ni: 8-14,Mo: <1.0,either Ti: >4% by weight of C and <0.8 or Nb: 8% by weight of C and <1.0,S: <0.03,O: <0.03,N: <0.05,REM: .ltoreq.0.30 and >0.10, and the remainder Fe and normally occurring impurities, REM being one or more of the elements Ce, La, Pr and Nd. The new steel is particularly suitable as a superheater steel and a heat exchanger steel.

Abstract: A drilling tool for drilling in metals has in its front part cutting insert-carrying cartridges, for instance 3, 5 or 7 in number. The peripheral cartridge (6) carries a peripheral cutting insert (7). This peripheral cartridge is fastened in the drill by a locking screw (16) that extends in a slot (17) in the drillhead. Radially inside of the peripheral cartridge is a wedge (15) which can be displaced axially and thereby regulate the radial position of the peripheral cartridge and cutting insert and, thereby, the cutting diameter. When the desired radial adjustment has been attained, the peripheral cutting insert is fixed by the locking screw (16). In this way, a very exact adjustment of the cutting diameter is obtained.

Abstract: There is now provided a method of machining and shaping a through opening in a fiber-reinforced composite material starting from a preformed hole. At least one rotation symmetrical milling body with a substantially smaller diameter than that of the preformed hole is placed in that hole and the opening is machined and shaped by the milling body partly rotating around its own axis, partly by a translational movement relative to the edge of the opening. According to the method, the fiber-reinforced material is oriented in such a way that the axis of rotation of the milling body is essentially perpendicular to the longitudinal direction of the fibers at the edge of the opening. The size and/or form of the finished opening differs significantly from that of the preformed hole. The radial spread of the damages and/or the defects define a lower limit for the amount of material removed.

Abstract: A metal cutting insert comprises a carbide substrate, and at least one body of superhard abrasive material, such as PCD or PCBN, bonded to an edge surface of the substrate and extending from one side surface to the other side surface of the substrate. There can be a plurality of superhard bodies disposed at respective corners of the substrate. The abrasive material is applied to the substrate in a container and then sintered and simultaneously bonded to the substrate by an elevated pressure/temperature step. Inserts can be made in rod form (i.e., in one piece) and then the rod can be transversely sliced into thin inserts; or the inserts can be made in separate pieces, with or without separators within the container.

Abstract: An indexable cutting insert comprises an upper surface, a bottom surface and side surface extending between said two surfaces. Between two adjacent cutting corners, a rake surfaces is formed such that the rake angle decreases with increasing cutting depth. In this way the cutting edge is reinforced towards a maximal cutting depth. This configuration is favorable, for example, at the machining of materials with a tendency of surface hardening.

Abstract: A metal cutting insert is directly mounted on a support surface formed either by an insert holder, or by a shim interposed between the insert and insert holder. The insert includes a bottom surface having grooves and planar surface portions disposed between the grooves. The support surface includes ribs which fit into respective grooves of the insert. Some of the planar surface portions of the insert bear against a planar, rib-free portion of the support surface.

Abstract: A drill includes a shank having a tip with two cutting inserts located in a main plane. The cutting inserts have short central cutting edges oriented in a secondary plane. The edges form a pointed center cutting edge for the purpose of entering a workpiece and thereby centering the drill. In the shank two helical flutes are provided, the flutes extending from the tip to the base end. The flutes are located diametrically opposite each other and are separated by two helical lands. The flutes lie in a flute plane that extends at an angle of 90.degree. to the land plane. The secondary plane forms an angle of about 90.degree. to the orientation of the land plane when viewed at the base end of the shank.

Abstract: A loading/unloading belt movement monitoring device includes magnets integral with the transportation carriage for providing a magnetic field which changes in time as a function of the speed of the loading/unloading belt and sensors on the machine frame for generating a signal indicative of the changing magnetic field, and used to monitor the movement of the loading/unloading belt.

Abstract: A drive mechanism for a chain saw has a minimal vertical height. The drive mechanism is particularly useful for timber harvesting vehicles, and includes a drive motor, a holder with a clamping mechanism for clamping a chain saw guide bar, a bearing assembly allowing the holder to rotate in relation to the motor and a swivel device to convey liquid from the motor to the guide bar through closed channels and grooves. The bearing assembly and the swivel device have openings having sufficiently large inner diameters such that the bearing assembly and the swivel device fit around the motor, thereby avoiding the need for mounting those elements on top of one another.

Abstract: In a method for use in dry, rotary, crushing full-area drilling, use is made of suction air alone for removing cuttings produced during drillings. To carry out the method, two suction nozzles (13) are arranged on the underside of a cutterhead (1). These nozzles together have a substantially diametrical extent and the length of a radius on the cutterhead and are provided with suction intakes (14A) in the vicinity of the periphery of the cutterhead. The suction intakes (14A) are connectible a common suction channel (11) in the drill string (6) of the cutterhead. The suction channel (11) has substantially constant diameter.

Abstract: A new chemical reaction container (43) is provided which is suitable for a process plant the production of sulfuric acid according to the contact process. It comprises a cylindrical envelope surface and is divided by vertical separation walls into at least two sections, usually three. Each section has an inlet and an outlet, the separation walls at their bottom parts having one or several openings for making contact possible between the different sections. The advantage of this is that both the drying of the process gas, the interpass absorption step and the final absorption step may be conducted in one and the same reactor, instead of three separate reactors, as done previously. This saves both space and material. Further are provided a plant and a process for the production of sulfuric acid according to the contact process, which plant and which process comprise the above reactor container.

Abstract: The present invention relates to CVD-coated cemented carbide tool used for chip forming machining. More particularly, it relates to a coating with an intermediate layer acting as a diffusion barrier thus influencing the coating structure and coating adhesion of the following layer.

Abstract: A chain saw guide bar is formed of a middle plate and a pair of side plates affixed on opposite sides of the middle plate. One (or both) of the side plates carries nozzles for emitting liquid dyes of different respective colors. Channels for conducting liquid dyes to the respective nozzles are formed by grooves cut in the interface between the middle plate and a side plate. Each channel is surrounded by a laser weld which completely isolates the channels from one another to avoid mixing the colors. The laser welds also secure the middle and side plates together. Additional laser welds secure the middle and side plates together, the additional laser welds being discontinuous.

Abstract: The presently claimed invention relates to a method of producing, in large volumes and at low cost, transition metal carbide, nitride or carbonitride whiskers, preferably submicron, having excellent reinforcing properties. These whiskers are suitable for use as a reinforcement in a wide range of materials, including metals, intermetallics, plastics, ceramics and metallic bonded hard material. The basic idea is the use of a carbon source with a volatile part which volatiles at temperatures up to 1000.degree. C. Transition metal oxide or alkali compounds thereof in amounts to satisfy the stoichiometric requirements of the desired carbide or nitride is mixed with the carbon powder along with an alkali metal chloride powder as a volatilization agent for the metal and a catalyst for the whisker growth such as Ni or Co. The reactant powders are blended in some typical manner using a high speed blender so as to intimately mix them.

Abstract: A blade-type holder for a cutting insert includes a blade body having front and rear slots. The front slot is closed at its rear end and open at its front end for receiving a cutting insert. The rear slot has a closed front end spaced rearwardly of the closed rear end of the front slot so that a portion of the blade body disposed between those closed ends defines a spring hinge. The spring hinge interconnects a base and camping portion of the blade body. The base portion is disposed below the slots, and the clamping portion is disposed above the slot. An operator employs a tool to manually apply a downward force to the clamping portion at location rearwardly of the spring hinge to cause the front end of the clamping portion to swing upwardly about the spring hinge, to widen the front slot. After a cutting insert has been replaced, the manual force is released, whereupon the front end is swung downwardly into clamping engagement with the cutting insert by the restoring force of the spring hinge.