A flash-free hot die forging process for front shell forgings of automobile differential

Abstract

The invention discloses a non-flash hot die forging process for forgings of the front shell of an automobile differential, including process forming steps: blank—primary upsetting—secondary upsetting—final forging; the blank is put into a primary upsetting die Among them, the forming rod of the blank is put into the lower mold cavity of the primary upsetting mold, and the head of the blank is put into the upper mold cavity of the primary upsetting mold. The forming rod of the blank basically does not participate in the upsetting, and the head of the blank The part is upset, and the blank is upset to form a first upsetting piece; the second upsetting is to continue upsetting the first upsetting piece, put the first upsetting piece into the secondary upsetting mold, and then upset the first upsetting piece Forming the secondary upsetting parts; final forging is to put the secondary upsetting parts into the final forging die, and upsetting the secondary upsetting parts to form forgings; the present invention adopts two-step forming upsetting to realize the forming and material distribution of forgings According to the requirements, the flash-free forging of larger shells with more complex shapes is realized. The die structure of this forming process is simple, the forgings are well filled, there are no defects such as folding and errors, and the operation is convenient.

Description

Technical field [0001] The invention belongs to the field of forging technologies involving a non-fly-free thermometer forging process for automotive shaft differential front shell forgings. Background technique [0002] Process Steps to Refer to Process for the Heat Model Forging Process of Front Shell Forgings figure 1 Looking: Blank - Upset - Prevision (with Flying Edge) - Final Forging (with Flying Edge) - Try. [0003] The existing defects existing in the forming process are: [0004] 1 The forgings are full of defects; [0005] 2, the upper mold cavity is shallow, check the disruptive disadvantage, and the forgings are prone to defects, easy to make a bad product; [0006] 3. This process uses open forging (with flying edge), the rod is completely extruded, and the lower end of the forgings is full, so the small steps of the rod cannot be precisely formed; [0007] 4, low production efficiency: weight, manual operation slow; also need to be cut, low production efficiency. ...

AI Technical Summary

Problems solved by technology

[0004] 1. The positioning from upsetting to pre-forging is inaccurate, and the material is easily deflected during forming. There will be more material on one side (more material is discharged into the flash), and less material on one side, resulting in less material on the side Forgings have filling and dissatisfaction defects;

[0005] 2. The cavity of the upper mold is shallow, it is difficult to check the error of forgings, forgings are prone to error defects, and defective products are easy to be produced;

[0006] 3. This process adopts open forging (with flash), the rod is completely formed by extrusion, and the lower end of the forged rod is full of difficulties, so the small steps of the rod cannot be accurately formed;

[0007] 4. Low production efficiency: heavy parts, slow manual operation; edge trimming is required, low production efficiency

Images