How to shrink the outer circle of ring forging to the inner circle as much as possible through heat treatment?
Release time：
2020-10-26 17:26
Source：
In modern pressure processing, for the production of large round forgings, roll rolling mill (reamer) can be used for roll forging forming, which has the advantages of accurate size, high production efficiency, good quality of forgings, etc. In the absence of production conditions for roll forging, it can be formed by expanding holes on a free forging hammer or hydraulic press with a horse stand. In fact, the roll forging L process is also developed on the basis of the horse rack reaming process, that is, it is an I process method to expand the diameter of forgings by local deformation and reducing the cross section. Two practical methods are introduced; The forming technology and operation method of large ring shaped forging horse frame reaming.
Generally, the heating speed is about 2 hours, which is heated and maintained in the furnace, and then cooled down to 500 ℃ for air cooling. If a specific data is required, the heating speed shall not exceed 200 ℃/hour, and the cooling speed shall not exceed 100 ℃/hour. The process curve is a bottomless trapezoid, the left bevel is a heating wire, the middle horizontal wire is an insulating wire, and the right bevel is a cooling wire. Record the automatic recording curve on the instrument, and the cooling mode is furnace cooling. If the general temperature of medium carbon steel is lower than 840-880 °, we can see what the material turnover manual is. The heat treatment process is annealing, and the specific process shall be based on the material.
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