A Method for Determining the Shape and Dimensions of Claw-pole Multi-step Hot Die Forging Pre-forging

Abstract

The invention relates to a method for determining the claw pole multi-step hot die forging pre-forged piece shape and size. (1) the initial shape and size are determined; (2) shape and size modification is carried out on claw part characteristic units; (3) shape and size modification is carried out on boss characteristic units; (4) shape and size modification is carried out on base characteristic units; and (5) local shape and size completion and complete digital-analog construction are carried out. By means of the method, the sizes of different parts of a pre-forged piece can be accurately allocated, a cavity can be filled with materials at different positions at the same time when claw pole final forging is carried out, and various forging defects in the final forging forming process are effectively avoided; and meanwhile, deformation force of different steps can be balanced, and the service life of a die and the equipment is prolonged.

Description

technical field [0001] The invention relates to the field of claw pole processing and manufacturing, in particular to a method for determining the shape and size of a claw pole multi-step hot die forging pre-forging. Background technique [0002] The claw pole is the core part of the rotor assembly of the automotive alternator. Its main function is to convert the axial magnetic field generated by the excitation coil in the rotor into a radial magnetic field, so that the rotor can obtain an alternating magnetic field distributed along the three-dimensional space when it rotates. The alternating magnetic field moves relative to the stator to generate alternating current, so the claw poles of automobile generators are sometimes also called magnetic poles of automobile generators. [0003] At present, there are many manufacturing processes for claw pole parts. For example, Jiangsu Longcheng Precision Forging Co., Ltd. discloses a claw pole for automobile generators and its manuf...

AI Technical Summary

Problems solved by technology

In the multi-step hot die forging process, the determination of the shape and size of the pre-forging is the most critical part, and it is also one of the difficulties in the design of the current multi-step hot die forging process. If the shape and size design of the pre-forging is unreasonable, Then forging defects such as fullness, turbulence, and folding are prone to occur in the final final forging forming step, which cannot guarantee the quality of the produced product, and also greatly reduces the service life of the mold, which will greatly increase the production cost. It wastes limited resources. In severe cases, the deformation force overload or imbalance caused by the unreasonable design of the shape and size of the pre-forging will also cause damage to the processing equipment, which poses a great potential threat to the personal safety of on-site operators and interrupts production. , affecting the production schedule and bringing huge losses to the company

[0005] At present, most of the existing methods for determining the shape and size of multi-step hot die forging pre-forgings adopt the principle of equal volume for roughly volume distribution. In the forging process, the requirement for a reasonable allocation of pre-forging volume makes it impossible to ensure that the materials at different positions of the claw poles can fill the cavity at the same time during the subsequent forming process, and various forging defects will appear during the final forging forming process, breaking the gap between different working steps. The balance of deformation force greatly reduces the service life of forming molds and equipment and increases the cost in the production process

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