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4817411 Manufacture of metal extrusions
New Patents
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4817411
4818635
MANUFACTURE OF METAL EXTRUSIONS
NITRIDE-BASED CERAMIC MATERIAL
Walter Bennett, Peter G Eden, Farnborough, United Kingdom assigned to Alcan International Limited
Thommy C Ekstrom, Nils A Ingelstrom, Stockholm, Sweden assigned to Santrade Ltd
A method of and apparatus for the manufacture of metal extrusions is disclosed in which the metal is extruded through a die having, preferably, a single extrusion aperture. The leading end of the extruded section is gripped and pulled away from the die by a puller 11, and the section is at the same time rapidly and uniformly cooled in a tunnel 8 as extrusion proceeds. When the puller reaches a predetermined distance from the die, the puller and extrusion are stopped simultaneously. The extruded section is then gripped in a device 12 including a pair of gripping jaws adjacent the die and shearing means by which the section is cut through at a location between this pair of jaws and the die. The puller is then operated to move it to stretch the extruded section while the section remains gripped by the gripping jaws of device 12 and in alignment with the die.
The present invention relates to a sintered nitride-based ceramic material, where the presence of polytype of Si-AI-O-N together with beta' and/or alpha' Si-AI-O-N constitutes the main components. It also contains an intergranular phase and depending on the composition crystalline AIN or A1203. The properties of the material, such as the wear resistance and toughness behaviour, can be improved by adding hard refractory principles and/or fine whisker like fibers. Coating with hard, inert and wear resistant layers is another alternative. The material is suitable to use where the demands of resistance to thermal shocks, high mechanical strength or high heat conductivity are great. It has turned out to be especially suitable for cutting tools but also other applications are possible, e.g. as engine components, wear parts, heat exchangers or as substrate material in the electronic industry. 4819474
4818336 METHOD OF MAKING METAL MOLDS AND DIES James J Rossetti assigned to Advanced Tool Technologies Incorporated A method of forming a metal mold or die from a model of the mold contours. A workpiece for the mold is coated with a material which is resistant to an acidic etchant and which has a melting temperature sufficiently elevated such that the coating is generally solid. The coated workpiece is then immersed in an etchant, and a heated template is pressed against the coated workpiece, melting any portions of the coating contacted by the template. The melted portions of the coating are displaced until the template contacts the surface of the workpicce. The template is then withdrawn to permit solidification of the coating, the etchant etches any portions of the workpiece exposed by displacement of the coating, and the ' process is repeated until the surface of the workpiece conforms to any contouring of the surface of the template.
METAL FORMING MACHINE HAVING A STROKE POSITION ADJUSTING ASSEMBLY Norber Gober, Leverkusen, Federal Republic Of Germany assigned to Eumuco Aktiengesellschaft fur Maschinenbau The stroke position adjusting assembly adjusts the stroke position of a pressing rod for a ram of a forging press. The pressing rod is arranged between the crank drive and the ram and includes an eccentric bushing. Adapting pieces rest against the perimeter of the bushing and are connected to tie-rods operable by a piston cylinder unit.
4819476 TOOLING FOR FORMING MACHINES HAVING IMPROVED GUIDANCE, TOOL MOUNTING, AND PILOT PIN SYSTEMS Johannes C W Bakermans, Dimitry Grabbe assigned to AMP Incorporated
iii
4817411
4818635
MANUFACTURE OF METAL EXTRUSIONS
NITRIDE-BASED CERAMIC MATERIAL
Walter Bennett, Peter G Eden, Farnborough, United Kingdom assigned to Alcan International Limited
Thommy C Ekstrom, Nils A Ingelstrom, Stockholm, Sweden assigned to Santrade Ltd
A method of and apparatus for the manufacture of metal extrusions is disclosed in which the metal is extruded through a die having, preferably, a single extrusion aperture. The leading end of the extruded section is gripped and pulled away from the die by a puller 11, and the section is at the same time rapidly and uniformly cooled in a tunnel 8 as extrusion proceeds. When the puller reaches a predetermined distance from the die, the puller and extrusion are stopped simultaneously. The extruded section is then gripped in a device 12 including a pair of gripping jaws adjacent the die and shearing means by which the section is cut through at a location between this pair of jaws and the die. The puller is then operated to move it to stretch the extruded section while the section remains gripped by the gripping jaws of device 12 and in alignment with the die.
The present invention relates to a sintered nitride-based ceramic material, where the presence of polytype of Si-AI-O-N together with beta' and/or alpha' Si-AI-O-N constitutes the main components. It also contains an intergranular phase and depending on the composition crystalline AIN or A1203. The properties of the material, such as the wear resistance and toughness behaviour, can be improved by adding hard refractory principles and/or fine whisker like fibers. Coating with hard, inert and wear resistant layers is another alternative. The material is suitable to use where the demands of resistance to thermal shocks, high mechanical strength or high heat conductivity are great. It has turned out to be especially suitable for cutting tools but also other applications are possible, e.g. as engine components, wear parts, heat exchangers or as substrate material in the electronic industry. 4819474
4818336 METHOD OF MAKING METAL MOLDS AND DIES James J Rossetti assigned to Advanced Tool Technologies Incorporated A method of forming a metal mold or die from a model of the mold contours. A workpiece for the mold is coated with a material which is resistant to an acidic etchant and which has a melting temperature sufficiently elevated such that the coating is generally solid. The coated workpiece is then immersed in an etchant, and a heated template is pressed against the coated workpiece, melting any portions of the coating contacted by the template. The melted portions of the coating are displaced until the template contacts the surface of the workpicce. The template is then withdrawn to permit solidification of the coating, the etchant etches any portions of the workpiece exposed by displacement of the coating, and the ' process is repeated until the surface of the workpiece conforms to any contouring of the surface of the template.
METAL FORMING MACHINE HAVING A STROKE POSITION ADJUSTING ASSEMBLY Norber Gober, Leverkusen, Federal Republic Of Germany assigned to Eumuco Aktiengesellschaft fur Maschinenbau The stroke position adjusting assembly adjusts the stroke position of a pressing rod for a ram of a forging press. The pressing rod is arranged between the crank drive and the ram and includes an eccentric bushing. Adapting pieces rest against the perimeter of the bushing and are connected to tie-rods operable by a piston cylinder unit.
4819476 TOOLING FOR FORMING MACHINES HAVING IMPROVED GUIDANCE, TOOL MOUNTING, AND PILOT PIN SYSTEMS Johannes C W Bakermans, Dimitry Grabbe assigned to AMP Incorporated