Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1997-12-17
1999-09-07
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72 91, B21H 502
Patent
active
059469595
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a method of making annular workpieces of metal, preferably steel with a profiled section and preferably with external angled teeth, wherein, starting from a blank whose outer diameter corresponds generally to the foot diameter of the teeth, the workpiece is forced to flow radially into a toothed die that forms together with a closing device a closed space and whereby the depth of the die corresponds to the tooth width. This invention also relates to an apparatus for carrying out the method.
BACKGROUND OF THE INVENTION
A method is known from German 3,718,884 wherein the workpieces are deformed purely by pressing. The large contact surfaces here subject the die to considerable wear which affects its service life (elastic deformation, bending, cracking). As a result it is necessary to prestress the die in an expensive setup. In addition with this pressing the necessary working procedures such as loading, knocking out, pivoting out, cleaning, lubricating, and cooling can only be done one after the other. This results naturally in a very long cycle time.
A method is known from German patent document 2,611,568 for producing annular workpieces with heavily profiled sections as well as a rolling facility for carrying out the method, with two oppositely movable and relatively angled rollers of which at least one which is a negative of the desired rolled profile is driven. With this so-called axial forging rolling (AFR) there is no way to produce an external or edge toothing and there is naturally no toothed die.
OBJECT OF THE INVENTION
It is an object of the invention to provide a method of the described type and an apparatus for carrying out the method wherein the high loads created during pressing are avoided and the cycle time can be increased.
SUMMARY OF THE INVENTION
This object is attained according to the invention in a system for forming external teeth on an annular metallic workpiece centered on a workpiece axis wherein the annular metallic workpiece is fitted to a die with internally directed teeth to form axially open and radially closed spaces between the workpiece and the die at the teeth and a pair of closing members are pressed axially oppositely against the die and workpiece to axially close the spaces. Then the fitted-together die, closing members, and workpiece are engaged between a pair of tools that are pressed together along a pressing axis generally parallel to the workpiece axis. The die, members and workpiece are synchronously rotated about the workpiece axis while the tools are rotated about respective tool axes each forming a small acute angle with the workpiece axis so as to locally compress the workpiece axially between the tools to deform the workpiece into the spaces. A bearing supports the die and workpiece while the workpiece is compressed between the tools.
The inventive use of the AFR method with opposite inclined tools to produce annular workpieces with outer or edge teeth makes it possible that on rolling only a portion of the annular surface of the workpiece is acted on so that relatively small pressing forces can be used. The teeth are produced in that the material is forced to flow radially into the toothed, independently journaled, and also rotating die. The tool profile does not contribute to the shaping of the teeth. The die is handled independently of the two rotating tools. It can according to the invention be fitted outside the pressing station with the blank of the workpiece and then transported between the two separated tools and, once the pressing operation is over and the tools have been retracted, it is taken together with the completed workpiece out of the working region of the rollers. It has been shown according to the invention as particularly advantageous to mount the die rotatably in an axially fixed journal and to arrange the journal on the pivot arm of a pivotal support so that the die can be moved by a simple pivotal movement into and out of the pressing station. It is preferable to provide three pi
REFERENCES:
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patent: 3611771 (1971-10-01), Ulrych
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patent: 4173877 (1979-11-01), Kreiskorte
patent: 4291559 (1981-09-01), Martin
Anderheyden Klaus-Peter
Siewert Frank
Dubno Herbert
Larson Lowell A.
WDB Ringwalztechnik GmbH
Wilford Andrew
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