Forming method for flashless forging of intermediate shaft forged pieces

Abstract

The invention discloses a forming method for flashless forging of intermediate shaft forged pieces. The forming method comprises the following steps: feeding of double pieces: selecting materials according to the standard that the diameters of bars are smaller than the maximum diameters of finally formed forged pieces, and carrying out feeding of the double pieces under the condition that the weights of the bars are twice the weights of the finally formed forged pieces; heating to the initial forging temperature; carrying out transverse rolling on the double pieces by using a transverse rolling die and automatically cutting the double pieces into two parts; and finish forging and forming: placing a transverse rolling blank in a finish forging lower die, driving the finish forging upper die to move downwards by a press to realize die closing, locking the finish forging upper die in the height direction, enabling an upper left sliding die and a lower left sliding die to move rightwards, and enabling an upper right sliding die and a lower right sliding die to move leftwards so as to rolling the transverse rolling blank into an intermediate shaft forged piece. The quality defects that the rolling ratio in transverse rolling is too large to cause core pressing and cutting-off of a large number of metal streamlines of a combined part of a toothed part and a shaft diameter are avoided; flash or tip cropping is avoided, and the utilization rate of materials is high; and processes are few, two workpieces can be formed at a time, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to a metal plastic forming process in the technical field of material processing, in particular to a flash-free forging forming method for intermediate shaft forgings. Background technique [0002] The intermediate shaft is the main part in the automobile transmission, figure 1 Shown is the intermediate shaft forging blank, the shank of which is used to machine the bull gear 1, the center double gear 2 and the pinion 3 sequentially from left to right. The current traditional die forging method has long process, low material utilization rate, low production efficiency and high manufacturing cost. The second is to completely use cross wedge rolling to roll the blank, and use large-size materials that meet the maximum outer circle of the teeth for rolling. Because the material heads at both ends need to be cut off, resulting in high material waste; Due to problems such as a large number of metal flow lines being cut off at the join...

AI Technical Summary

Problems solved by technology

[0005] (1) The process is long, the use of equipment and personnel is large, and the cost of fixed assets and labor is high;

[0006] (2) The blank has flash and needs to be trimmed;

[0007] (3) The waste of materials is serious, and the cut off flash becomes waste, and figure 1 Take the product as an example, the blanking weight of the traditional die forging forming method is 4.8Kg;

[0008] (4) Many tooling molds are used, and the cost of molds is high

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