Rolling blank making method for automobile transmission gear ring

Abstract

The invention discloses a rolling blank making method for an automobile transmission gear ring by taking round steel as a blank. The method comprises the processes of blanking, heating, upsetting, blind hole punching, performing, wad punching, end surface pressing, ring-rolling forming, shaping, normalizing, shot blasting and the like, and is characterized in that: the section of the cavity formed by the moulds used in the steps of performing and blind hole punching is approximately same as the circular inner cavity with different inner and outer diameters corresponding to the blank of the automobile transmission gear ring; when the ring-rolling forming is finished, the section of the cavity formed by a rolling wheel and a rolling shaft is completely the same as the circular inner cavity with different inner and outer diameters corresponding to the blank of the automobile transmission gear ring; the outer circle of the rolling wheel and the outer circle of the top wheel are meshed with the outer circle of the blank respectively; and meanwhile, the part with a large deformation difference in the ring-rolling forming is subjected to ring rolling in advance. According to the invention, the ring-rolling processing technology is smartly applied to the transmission gear ring which is an asymmetric ring blank, the subsequent machining quantity is reduced to the greatest degree, the material consumption is reduced, and the service life of the product is prolonged.

Description

technical field [0001] The invention belongs to the technical field of automobile transmissions, and in particular relates to a rolling blank method of an automobile transmission ring gear. Background technique [0002] my country's automotive transmission ring gear blanks have been made by traditional forging and pressing methods to make round steel billets through blanking, heating, piercing, pressing, punching and skinning. Since the ring gear blank has a large pressing plane area, a thin plane part, and a taller and thinner corrugated ring, the external dimensions of each part are required to be accurate, and the forging pressure during closed pressing is very large, so a large tonnage of pressure must be used. The machine can be pressed and formed, so the configuration and use of equipment is large, and the energy consumption of the equipment is high. Due to the large diameter of the inner hole of the ring gear, the weight of the skin removed by punching after forging ...

AI Technical Summary

Problems solved by technology

Since the ring gear blank has a large pressing plane area, a thin plane part, and a taller and thinner corrugated ring, the external dimensions of each part are required to be accurate, and the forging pressure during closed pressing is very large, so a large tonnage of pressure must be used. The machine can be pressed and formed, so the configuration and use of equipment is large, and the energy consumption of the equipment is high

Due to the large diameter of the inner hole of the ring gear, the weight of the skin removed by punching after forging is large, and the material consumption is high.

[0003] The rolling and expanding processing method adopted by the rolling blank method of the synchronous sliding sleeve of the automobile transmission is limited to the manufacture of symmetrical circular ring blanks similar to the synchronous sliding sleeve blanks. If the synchronous sliding sleeve rolling billet method is used for pressing, when the billet is made in the billet making process, it cannot be pressed to meet the preformed size of the ring gear blank part during the rolling of the ring rolling machine, and the billet is simply formed during the billet making The workpiece is pressed into a straight ring. Since the width ratio and thickness ratio of each part of the ring gear blank are very different, the deformation difference of each part when rolling with the straight ring blank (deformation difference = the corresponding position before rolling The difference between the outer diameter and the inner diameter - the difference between the outer diameter and the inner diameter at the corresponding position after rolling) is very different, when the part with a large difference between the inner and outer diameters (that is, the blank is very thick) has been pressed to reach the finished size and shape When required, the part with a small difference between the inner and outer diameters (that is, the blank is very thin) cannot meet the external dimensions required by the finished product at all

Since it is impossible to preform the thick and narrow part of the ring gear in advance, it is difficult to extrude into the deep and narrow cavity of the rolling wheel due to the influence of poor metal fluidity and high deformation resistance during rolling. A blank that meets the requirements of the finished product shape and size is formed in the groove

If it uses the automobile transmission synchronous sliding sleeve rolling blank method to carry out two-piece symmetrical pressing, then it will inevitably cause material waste when it is divided into two pieces

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