Pre-distributed material concentrated forming cross wedge rolling technique

Abstract

The invention relates to a pre-distributed material concentrated forming cross wedge rolling technique. The cross wedge rolling forming technique comprises the following process steps that a bar is put into a mold material waiting area after the bar is heated to a rolling temperature; a rolling mill is started, then a mold is driven by the rolling mill to rotate, and under the action of the friction force, the mold drives the bar to rotate and performs rolling; a pre-distributed material section of a diameter-2 is wedged; the pre-distributed material section of the diameter-2 is broadened; thepre-distributed material section of the diameter-2 is formed; the pre-distributed material sections of a disk-1 and a disk 2 are formed; the pre-distributed material sections of the diameter-1 and adiameter-3 are wedged; the pre-distributed material sections of the diameter-1 and the diameter-3 are broadened; the pre-distributed material sections of the diameter-1 and the diameter-3 are head-cutand overturned; the pre-distributed material sections of the diameter-1 and the diameter-3 are formed; the pre-distributed material sections of the diameter-1, the diameter-2 and the diameter-3 are wedged; the pre-distributed material sections of the diameter-1, the diameter-2 and the diameter-3 are broadened, and the pre-distributed material sections of the disk-1 and the disk-2 are stacked; thepre-distributed material sections of the diameter-1, the disk-1, the diameter-2, the disk-2 and the diameter-3 are subjected to concentrated forming; and the blanking and rolling of a product are completed. According to the technique, the shortcomings of the prior art are overcome, material distribution is uniform, materials are saved, the quality is improved, the machining is convenient, and thematerial utilization rate is improved.

Description

technical field [0001] The invention relates to the technical field of cross-wedge rolling, in particular to a cross-wedge rolling technology for centralized forming of pre-divided materials. Background technique [0002] When the existing multi-step shaft parts are rolled by cross wedge rolling, the forming process is formed from the middle to both ends one by one. The forming of each step has its own position in the circumferential direction of the roll. It can also be said that each step It is formed in different circumferential directions of the roll. During the rolling process, the temperature of the billet is gradually decreasing, that is to say, the temperature of the billet is different when it is formed at various stages in the circumferential direction of the roll during the rolling process. From the principle of thermal expansion and cold contraction, different temperatures have the same size The size of the hot billet is different when it is cooled to the same t...

AI Technical Summary

Problems solved by technology

[0004] Since the forming process is formed from the middle to both ends one by one, the cost of the mold occupying a long roller surface is high, and the processing capacity of the equipment is limited

Since the position of each step forming stage is different in the circumferential direction of the roll, the difference in the circumferential position of the mold itself is directly reflected on the product, resulting in the geometric difference of each shaft diameter of the product. At the same time, the requirements for the rolling equipment are also high, and the adjustment is difficult. , the dimensional stability of the product is poor, and cross-wedge rolling will produce material bumps when the two ends are finally formed, which will inevitably cause material waste. In view of the above problems, it is urgent to improve

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