Abstract: A rotationally symmetrical tool assembly includes a first component constituted by a tool holder; a second component constituted by a tool head and being removably attached to the first component such that engagement faces of the first and second components are in a contacting relationship with one another and are oriented perpendicularly to the rotary axis of the tool assembly. A fitting bore is provided in one of the components and a guide bore is provided in the other of the components. A securing pin projects from the fitting bore and extends into the guide bore for determining and maintaining a desired angular position of the second component relative to the first component.

Abstract: A steep angle conveyor for conveying bulk materials from a lower level to an upper level, the conveyor including: a one-piece bridge structure having two opposed ends each arranged to be disposed at a respective one of the levels; an endless conveyor extending along the bridge structure; a first intermediate frame to which is articulated that one of the ends which is arranged to be disposed at the lower level; a second intermediate frame to which is articulated that one of the ends which is arranged to be disposed at the upper level; an adjusting device connected for adjusting the position of the first intermediate frame in a vertical direction; first and second supporting devices each arranged to support a respective one of the intermediate frames while permitting each of the intermediate frames to be rotatable relative to its associated supporting device; and a member supporting the first intermediate frame on the first supporting device for permitting the first intermediate frame to be displaceable relativ

Abstract: A high strength austenitic steel having a yield strength above 600 N/mm.sup.2 at 02% permanent strain, containing about 0.5 to 1.5% by weight of nitrogen, about 6 to 12% by weight cobalt, and less than 5% by weight nickel. The steel is treated at about 1050.degree. C. to 1200.degree. C. and then quenched in water.

Abstract: An apparatus for receiving a tool carrier comprises a tool holder defining a receiving bore adapted to receive a portion of the tool carrier, an arrangement for supplying pressurized fluid to the receiving bore of the tool holder to clean adjacent surfaces of the tool holder and the tool carrier during insertion of the tool carrier into the receiving bore; and an arrangement for detecting the pressure of the fluid supplied to the tool holder for ascertaining whether correct operational positioning of the tool carrier exists with respect to the tool holder.

Abstract: A tool changing device for tool systems in which a tool head and a tool holder are connected with one another by means of an automatic clamping mechanism which includes an integrated clamping screw. The tool changing device includes a lifting carriage which is movable on several axes and a rotatably mounted, motor driven pivot arm which is mounted on the lifting carriage. The pivot arm has a free end which is equipped with a gripper holder having at least four tool locations and an integrated clamping shaft. Both ends of the clamping shaft are provided with profiles which permit transfer of torques. The clamping shaft can be moved axially in such a manner that it can be coupled with the clamping screw of a tool holder either from the left or from the right.

Abstract: A bucket conveyor including self-scooping bucket elements, a support structure, and a mechanism for displacing the elements over a closed path along the support structure for conveying bulk material from a region below the structure to a region in the vicinity of the top of the support structure, the closed path having two substantially parallel reaches, each reach having a vertical portion. The support structure includes: a vertically oriented upper member extending from the region of the top of the support structure; a lower member connected to the upper member for pivotal movement relative to the upper member; and a base member connected to the lower member for pivotal movement relative to the lower member and having a longitudinal dimension which is inclined to the vertical and protrudes laterally from the structure.

Abstract: Particles are sinter-fused onto the surface of a prosthesis shaft of titanium or titanium alloys. Before sinter-fusing, a coating material which forms below the .alpha.-.beta.-transition temperature a liquid phase with the material of the prosthesis and particles is applied to provide a coating between the shaft and particles.

Abstract: A protective device for a submersible lance to be used in a vessel of molten material, such as steel, prevents undesirable deposition of the material at the juncture of lance and probe by having in the lance a channel for gas, and by having between the lance and the probe a gas-conducting disk which projects this gas circumferentially onto the lower surface of the lance.

Abstract: A dental prosthesis including a secondary member coupled to at least one prosthetic tooth suitable for being effectively mounted onto or readily removed from a primary member coupled to a remaining tooth or implant. A bar member is accommodated inside a common bore in the primary and secondary members for coupling thereof. An arresting disc member is introduced into a recess inside the prosthetic toth to block off a leading shaft portion of the bar member having the largest cross-section and preventing the bar member from falling out. The entire bar member is suitable for freely moving along the bores of the primary and secondary members. Between an intermediate portion of the bar member and the recess inside the prosthetic tooth is a space which is filled with plastic material. A trailing head portion of the bar member is ground off to correspond with the buccal exterior surface of the prosthetic tooth.

Abstract: A process of producing iron from fine-grained iron ore by direct reduction, which includes adding oxygen, sponge iron and at least one of coal fines and low-temperature carbonized coal to an iron bath in a melt gasifier to produce a reducing gas, regulating the temperature of the reducing gas by blowing coal fines into it to produce a cooled reducing gas and a low-temperature carbonized coal, separating the low-temperature carbonized coal from the cooled reducing gas in order to use the separated low-temperature carbonized coal in the melt gasifier, preheating a fine-grained iron ore with a used reducing gas containing carbon monoxide to a temperature from 450.degree. to 700.degree. C., and reducing the preheated fine-grained iron ore with the cooled reducing gas at a temperature from 700.degree. to 1100.degree. C.

Abstract: A process of manufacturing a roll suitable for use in a rolling mill, the roll having a cylindrical barrel middle section and a neck at each end of the barrel, wherein the barrel and necks are of different material compositions, by remelting an electrode having a central region corresponding in mass and composition of materials to that desired for the barrel of the roll, two end regions corresponding in mass and composition of materials to that desired for the necks of the roll and a transition region disposed between the central region and each end region, each transition region including the material of the barrel and at least one further material. An electroslag remelting process is used in a water cooled mold. The mold is composed of at least two parts and defines a cavity approximating the final outlines of the roll. The mold has tapered transition regions between a part of the cavity corresponding to the barrel and the constricted cavity regions corresponding to the necks.

Abstract: An extrusion tool includes an end plate, a plate holder cassette seating the end plate and having opposite first and second faces; an extrusion head seating the cassette, and a first clamping device having an operative position for pressing the cassette and the end plate as a unit against the extrusion head by engaging an outer face of the end plate. The first clamping device further has a withdrawn position in which it permits a removal of the end plate from the cassette and a removal of the cassette from the extrusion head. There is a further provided a second clamping device for pressing, in a clamping position thereof, the cassette against the extrusion head by engaging a front face of the cassette externally of the end plate, whereby the end plate is, in the withdrawn position of the first clamping device, removable from the cassette while the cassette remains pressed against the extrusion head by the second clamping device.

Abstract: An extrusion tool for making a drill bit blank provided with an internal rinsing bore extending helically in a longitudinal direction of the drill bit blank, includes a nozzle having an inner wall defining a throughgoing axial bore through which a malleable material is passed in a direction of extrusion parallel to the tool axis. The axial bore forms an inlet portion and a mold chamber adjoining the inlet portion downstream thereof as viewed in the direction of extrusion. There is further provided a mandrel situated in the inlet portion; a resiliently deformable wire supported by the mandrel and projecting into the mold chamber; and a helical device provided on the inner wall in the mold chamber for twisting the malleable material as it passes through the mold chamber. There is further provided a clamping device having a tightened state for immobilizing the nozzle and the mandrel with respect to one another during extrusion operation.

Abstract: An alloy for producing dental castings comprises 26.5 to 27.5% Cr, 4.5 to 5.5% Mo, 0.65 to 0.8% Mn, 0.4 to 0.5% Si, up to 1% Fe, up to 0.05% C, and the balance Co.

Abstract: To make a container with a butt welded longitudinal seam, the side edges of a preformed blank are guided by straight grooves so that the side edges converge at an acute angle. At the point of convergence the side edges are heated to at least to the forging temperature, preferably by a focused laser beam. The side edges are then tangentially compressed before they cool.

Abstract: Process for separating solid substances from liquid mixtures of substances, wherein the liquid substances contained in the mixture are separated from the solid substances by countercurrent extraction with a solvent which, during the extraction process, is in a liquid or supercritical state and which, under standard conditions, is gaseous. The solvent is fed to a cylindrical extraction chamber at the lowest point of the extraction chamber. The solvent leaves the nozzles with a Reynold's number of 40,000 and flows upward in the extraction chamber with a Reynold's number of 2,700 to 8,000.

Abstract: The extruder head has a hydraulic cylinder for the movable upper head member and/or the movable lower head member attached to each side of a stationary head member rigidly whose piston rod is extendable in the direction of the movable head member. Between the free ends of the piston rods and the associated movable head member there is provided a releasable connection means under tension. This connection means comprises at least two radial projections on the piston rod distributed uniformly about the circumference of the piston rod and a passage corresponding to the shape of the projection with a contacting surface in and/or on the associated head member. To loosen or release the connection means the piston rod is rotated about half a partial angle determined by the number of projections.

Abstract: In a combination including a tool head and a tool holder of a machine tool, the tool head having a shank and an outwardly radially projecting contact collar carried by the shank and the tool holder being formed to have a receiving bore which provides a counterface disposed to cooperate with the contact collar, the combination further including clamping structure for locking the tool head to the tool holder with the contact collar bearing against a selected portion of the counterface, the contact collar and the selected portion of the counterface are cylindrical and, when the contact collar is out of engagement with the counterface, the contact collar has an outer diameter which is slightly greater than the diameter of the selected portion of the counterface for effecting secure clamping of the tool head to the tool holder.

Abstract: A power supply for a three-phase plasma heating unit includes a three-phase transformer having a primary winding group with taps which are switched under load. The transformer also has secondary winding groups which are offset by a 60.degree. phase angle, the secondary winding groups being connected to the three-phase plasma heating unit. Converter units are also connected to the secondary winding groups. Each converter unit includes a three-phase thyristor bridge and a choke connected to the bridge. Another embodiment employs two three-phase transformers. The first transformer has a secondary winding group with taps which are switched under load. The second transformer has a primary winding group which is connected to the secondary winding group of the first transformer. The second transformer also has secondary winding groups which are offset by a 60.degree. phase angle, the secondary winding groups being connected to the three-phase plasma heating unit.

Abstract: A process for continuous dextrose-monohydrate crystallization whereby an evaporated concentrated liquor is mixed with a recirculated dilute phase to form a feeding liquor. At least a portion of this feeding liquor is fed through the shearing zone of a homogenizer. The sheared mother liquor is then fed to a vertical cooling-crystallizer to form a suspension. The suspension is separated into a concentrated phase and a dilute phase. The dilute phase separated from the suspension is employed as the dilute phase which is mixed with the evaporated concentrated liquor.