Introduction of material and Technology for Cold forging of Zhangqiu Forgings
The size and quality of the blank for cold forging in Zhangqiu forging Plant should be controlled accurately and the end face should be straight.
For those with high requirements, the surface should be peeled, turned or ground.
The purpose of softening annealing is to reduce the strength of raw materials, ensure uniform properties and improve plasticity.
Low carbon steel is treated by common annealing, medium carbon steel and low alloy steel by spheroidizing annealing.
The lubrication of cold forgings is very important.
It can reduce the load of cold forgings and improve the life of dies and the quality of cold forgings.
Generally speaking, the lubrication treatment is to form a strong film on the blank surface in the cold forging process to reduce the friction resistance and cold forging force.
Before lubrication treatment, the blank surface should be cleaned, including washing alkali to remove oil, acid washing or shot peening to clean the oxide scale, cleaning the blank surface.
The shape of the preforging step directly affects the forming of the forging step.
The general principle of the design is that in order to ensure the final forging die cavity is full, the designed preforging billet should be thickened as much as possible in the final forging die cavity, that is, the pre-forging step height should be 6-8mm higher than the final forging step, and the diameter should be smaller than the final forging step 0.52mm.
There are different design characteristics for different types of forgings.
The distribution of punching times and depth.
The number of holes is determined by the ratio of hole depth to hole diameter.
The punch depth is configured as multiple punches, the first punch depth is shallow, and the other punch depths are basically the same because the first punch blank is unstable.
Die forging is a common forming method in the production of forgings, which is suitable for large quantities of processing.
Die forging process is the whole production process of forging blank through a series of processing procedures.
The die forging process includes the following steps.
Preparation process of Zhangqiu forgings: bucket holes are made according to the billet dimensions required by forging.
Heating process of Zhangqiu forging: the billet is heated according to the heating temperature required in the deformation process.
Forging process: can be divided into casting billet and die forging two processes (steps).
There are many ways to create blanks.
The die forging process includes pre-forging and final forging.
The deformation process is determined according to the type of forgings and the die forging equipment selected.
Post-forging process: the function of this process is to make up for the shortcomings of die forging and other pre-forging processes, so that forging can fully meet the requirements of forging drawings.
The post-forging process includes edge grinding, punching, heat treatment, correction, surface trimming, residual burr, fine pressing and so on.
Inspection process: including inter-process inspection and inspection.
Interprocess inspection is usually a spot check.
The inspection items include shape and size, surface quality, metallographic structure and mechanical properties, etc.
The specific inspection items are determined according to the requirements of forgings.
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