Improved cold reducing die for precisely-forged channels of bell housing

Abstract

The invention discloses an improved cold reducing die for precisely-forged channels of a bell housing, and relates to the field of dies. The improved cold reducing die for the precisely-forged channels of the bell housing is based on the metal flow formation rule and is used for forgings through the warm forging and cold forging combined plastic forming technique. The improved cold reducing die for the precisely-forged channels of the bell housing comprises a finishing punch, wherein a base and a punch main body of the finishing punch are of an integrated structure. The upper end of the finishing punch is evenly divided into six petals, and the depth of each cutting groove is half to five sixths the overall height of the finishing punch. The improved cold reducing die for the precisely-forged channels of the bell housing has the following advantages that the finishing punch is integrated and thus is better than a split type finishing punch; after a mandrel is ejected to the working position, the punch does not warp, and the mandrel can be tightly wrapped with the punch; in the working process, the six petals of the punch do not deviate, the location degree is good, and thus it is guaranteed that the six channels of an inner cavity are evenly distributed after finishing is completed; the diameters of the channels of the inner cavity can be controlled easily, and the size can be adjusted freely within a certain range; the machining difficulty of the die is lower than that of the die of the split type structure, and the precision can be guaranteed more easily; and the die is easy and convenient to assemble and easy to operate and adjust.

Description

technical field [0001] The invention relates to a die, in particular to an improved bell-shaped shell precision forging groove cold shrinking die which adopts warm forging and cold forging combined forging plastic forming technology forgings according to the metal flow forming rule. Background technique [0002] The precision forging of the bell-shaped shell belongs to the cup-rod automobile forging. The structure of the cup is very complicated. The surface of the inner cavity is a spherical surface. Strong rotational torque, in addition, there is a certain eccentric distance between the spherical surface and the center of the spherical raceway. When the car is running, the matching accuracy of the bell-shaped shell raceway and the steel ball is directly related to the stability and durability of the car, so its dimensional accuracy is very high. After the forging is completed, only 0.2mm~ 0.3mm tiny grinding amount. The specific structure is as Figure 1-2 Shown is a sche...

AI Technical Summary

Problems solved by technology

The reason may be that the punch needs to shrink back and forth, which requires a certain gap between the punch base and the platen, and it is this gap that causes the warpage to occur

[0007] (2) In the process of reducing the diameter, the six petals of the punch will be slightly offset, so that the six grooves of the inner cavity after finishing are not evenly distributed, and the centers are not on the same axis

[0008] (3) The channel diameter is not easy to control, and it is easy to exceed the tolerance range allowed by the size

[0010] (5) Burrs are prone to appear in the gap position of the six petals, which affects the shrinkage of the punch

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