Manufacturing process of high-strength round-link chain

Abstract

The invention relates to the field of round-link chains, and particularly discloses a manufacturing process of a high-strength round-link chain, which comprises the following steps of: 1) prefabricating a bar and manufacturing two ends into inclined surface ends, 2) pre-bending the bar into a special-shaped ring body comprising two U-shaped parts, 3) connecting the special-shaped ring body with an adjacent chain ring, twisting the two U-shaped parts to enable the two inclined surface ends to be locally lapped and propped, and 4) manufacturing the high-strength round-link chain. (4) welding the two inclined surface ends by utilizing flash butt welding to enable the two inclined surface ends to be matched and forged together to form a closed long circular chain ring, (5) carrying out surface treatment and heat treatment, and (6) carrying out post-treatment on the round-link chain after forming to obtain the high-strength round-link chain. Chain rings of the round-link chain manufactured through the technology are balanced in stress and low in abrasion efficiency, the effective welding area is increased, the connection strength is improved, finally, the strength, the service life and the transmission efficiency of the round-link chain are remarkably improved, the chain breakage situation is greatly reduced, upsetting allowance is not needed, the material cost of the round-link chain is reduced, and the production cost is reduced. And meanwhile, the power consumption of upsetting equipment is reduced.

Description

technical field [0001] The invention relates to the technical field of circular ring chains, in particular to a manufacturing process of a high-strength circular ring chain. technical background [0002] The circular chain is widely used in mining machinery, ships, lifting equipment and other fields. It is often used as a traction and transmission component of large power equipment. Once the chain is broken during its work, it will cause the equipment to fail to operate and affect the operation of the entire working face. The production process can even lead to safety accidents, so the ring chain has extremely high requirements for strength and safety. At present, the manufacturing process of high-strength circular chain is mostly the same. Usually, high-strength alloy steel is used to produce bar material, and a chain braiding machine is used to bend it into an oblong chain ring composed of two straight arms and two arc ends. It is woven into the chain, and finally the joi...

AI Technical Summary

Problems solved by technology

At present, the manufacturing process of high-strength round link chains is mostly the same. Usually, the high-strength alloy steel is used to cut the bar to make the bar, and the chain knitting machine is used to bend it into an oblong link composed of two straight arms and two arc-shaped ends. Into the chain, and finally use flash butt welding to weld the joints. In the above-mentioned existing manufacturing process, the chain link is usually bent from a bar to form a single joint structure. During the flash butt welding process The chain link will be shortened longitudinally by the upsetting force, and the two joints will have a certain material loss due to the extrusion of the molten material on the joint surface, and the other straight arm without the joint will be correspondingly deformed by plastic deformation. Shortening, there is no material loss, which leads to the unequal size and shape of the two straight arms of the formed link; at the same time, there is no balance of plastic deformation produced by the straight arms of the joint during the upsetting process It is difficult to pre-control, and there may even be significant uneven deformation such as local bending and local coarseness; in addition, during the upsetting process, the two arc-shaped ends are often compressed to a certain extent and the deformation state is difficult to control; the above factors lead to , the shape of the links of the round link chain produced by the existing technology is not standard and uniform, the force distribution of the links is not balanced during the working process, and the poor matching between the links and between the links and the sprockets is prone to occur. Unfavorable phenomena such as chain skipping, tooth beating, difficulty in tooth removal, etc., the wear rate is high, and eventually the working life of the round link chain is low, the transmission efficiency is poor, and the chain is easy to break during the working process

In addition, when using the existing technology to manufacture high-strength round link chains, it is necessary to drive the overall longitudinal shortening of the link chain during the upsetting link of flash butt welding. On the one hand, the manufacturing cost of the round link chain is increased due to the large material loss; The required upsetting force is relatively large, which increases the power consumption of production equipment

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