Process for forming generator claw pole of vehicle

Abstract

The invention relates to a process for forming a generator claw pole of a vehicle, and the process provided by the invention comprises the following steps: firstly baiting; then heating; performing radial upsetting extrusion so as to form a middleware; reversely extruding a claw part into a final forging; and finally machining and preparing the forging into an end product workpiece, wherein the radial upsetting extrusion and the reverse extruding forming are realized by using a radial upsetting extrusion mould and a reverse extruding mould. According to the invention, the forging processing process is simplified, so the process provided by the invention has the advantages that the process is simple, the production period is short, the use ratio of materials is high, and the product precision is high.

Description

technical field [0001] The invention relates to the technical field of precision forging of automobile claw poles, in particular to a forming process for automobile claw poles of generators. Background technique [0002] At present, the claw pole forming processes of automobile generators at home and abroad include: 1. Machining process after precision casting. The claws produced by this process are extremely prone to defects such as looseness, shrinkage, inclusions, and chemical composition instability, resulting in magnetic resistance. Increase, poor electromagnetic performance, which affects the power of the generator; 2. Sheet metal stamping, the process flow is: blanking ~ finishing R ~ punching ~ bending ~ claw finishing ~ overall finishing, during the punching process The selected plate thickness is the thickness of the claw pole parts required by the design. The production process steps are simple, and the requirements for workshops and machining equipment are not hi...

AI Technical Summary

Problems solved by technology

[0002] At present, the claw pole forming processes of automobile generators at home and abroad include: 1. Machining process after precision casting. The claws produced by this process are extremely prone to defects such as looseness, shrinkage, inclusions, and chemical composition instability, resulting in magnetic resistance. Increase, poor electromagnetic performance, which affects the power of the generator; 2. Sheet metal stamping, the process flow is: blanking ~ finishing R ~ punching ~ bending ~ claw finishing ~ overall finishing, during the punching process The selected plate thickness is the thickness of the claw pole parts required by the design. The production process steps are simple, and the requirements for workshops and machining equipment are not high, but this process can only be used for claw poles without a magnetic collector core, that is, there is no boss in the middle In the production of claw poles, the material utilization rate is low during blanking, the precision is not high, and the economic benefit is poor. In addition, the anisotropy of the rolled plate will also affect the performance of the claw poles of the alternator; 3. Cold extrusion forming, its The technological process is: blanking ~ annealing ~ phosphating saponification ~ forward extrusion ~ correction ~ annealing ~ phosphating saponification ~ piercing ~ punching ~ trimming ~ annealing ~ phosphating saponification ~ bending ~ the first precision pressing ~ the second time Fine pressing, because electromagnetic pure iron is sensitive to work hardening, severe work hardening will occur in the cold extrusion process. Phosphating saponification has been used many times to reduce friction

There are many processes in this process, and the pre-forging produced in the previous process is required to be accurately positioned in the mold cavity of the subsequent process. In actual production, a large number of equipment, many operators, large investment, and high production costs are required; 4. Hot forging and cold precision Whole forming, its technological process is: blanking ~ forging heating to 1100 ℃ ~ primary preforming ~ secondary preforming ~ final forming ~ punching and trimming ~ annealing ~ phosphating saponification ~ finishing

The effect of annealing and phosphating and saponification is the same as that used in cold forming, which is used to reduce friction and reduce forming force. The forging heating temperature is about 1100°C. Due to the complex shape of the claw poles, secondary preforming is used in forming, which is different from cold forming. Compared with hot forging and cold finishing, extrusion forming has fewer working steps, and the plasticity is improved when the metal is heated, and the deformation force is greatly reduced, which avoids work hardening and is conducive to the improvement of workpiece performance. However, hot forging needs to remove flash, Material utilization is lower than cold extrusion

[0003] The above-mentioned processes all have the disadvantages of complicated procedures, long production cycle and low material utilization rate.

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