Flash-free forging method of cylinder lug

Abstract

The invention provides a flash-free forging method of a cylinder lug. The flash-free forging method employs special forging equipment and comprises the following specific steps of 1) a pre-forging process including that a heated round bar is symmetrically put in the die cavity of a lower pre-forging die, an upper pre-forging die and the lower pre-forging die are locked by a wedge die-locking mechanism of the special forging equipment after the upper pre-forging die and the lower pre-forging die are assembled, and then two upsetting mandrels are driven by a left electric screw mechanism and a right electric screw mechanism to extrude and upset the two ends of the round bar to form a pre-forged piece; and 2) a finish-forging process including that the pre-forged piece is put in the die cavity of a lower finish-forging die, an upper finish-forging die and the lower finish-forging die are locked by the wedge die-locking mechanism of the special forging equipment after the upper finish-forging die and the lower finish-forging die are assembled, and then two extruding mandrels are driven by the left electric screw mechanism and the right electric screw mechanism to extrude the pre-forged piece serving as a blank to fill the die cavity so as to obtain a finish-forged blank. Through the application of the flash-free forging method, during the forging process of the cylinder lug, no flash is generated, the weight of raw material can be reduced, and the purpose of reducing the consumption of the raw material is achieved.

Description

technical field [0001] The invention relates to a forging method of an oil cylinder lug, in particular to a flash-free forging method for an oil cylinder lug in an engineering hydraulic cylinder. Background technique [0002] Cylinder lugs are one of the main components of engineering hydraulic cylinders, currently such as figure 1 The forging process of the lifting lug of the oil cylinder shown: the upper die for the lifting lug of the oil cylinder installed on the slider of the forging press with a larger tonnage is under the vertical downward power of the forging press, and the pre-forging upper die of the lifting lug placed on the oil cylinder lifting lug is under the action of the vertical downward power of the forging press. The heated larger diameter round billet on the lower forging die applies pressure, and when the upper die and lower die are closed, the pre-forging is obtained; then the pre-forging is placed on the lower die for final forging, and then the final f...

AI Technical Summary

Problems solved by technology

This forging method for the cylinder lug blank is difficult to meet the requirements of forging enterprises for energy saving, cost reduction, and efficiency improvement. For production, the forging step is long, so more equipment needs to be invested, resulting in a large investment in equipment and power consumption; in order to ensure that the blank can fill the large diameter ring structure in the middle of the blank and the thinner round rod mold at both ends For the shape cavity, a thicker diameter round billet is selected for forging or a partial upsetting billet is added in the upsetting step, resulting in a low material utilization rate; currently, in the forging process of the oil cylinder lug, in order to facilitate demoulding, the ring inner wall of the forging is set larger Inclination, the blank is not only heavy, but also has a large processing allowance for the finished product in the later stage, and the production efficiency is particularly low

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