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Difficulties in the Processing of Automotive Precision Parts

October 28, 2022

Improvement method of automobile parts stamping process:
1. When designing the structure and shape of automobile stamping parts, Shenzhen Precision Parts Processing Factory suggests to use simple and reasonable surfaces and their combinations, and at the same time, it should try to minimize the number of machined surfaces and the processing area.

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2. The materials used for automobile stamping parts should not only meet the technical requirements of product design, but also meet the requirements of stamping process and the processing requirements of cutting, electroplating, cleaning and other processes after stamping.

3. Requirements for automobile stamping formability For the forming process, in order to facilitate stamping deformation and improve the quality of parts, materials should have good plasticity, small yield strength ratio, large plate thickness directivity coefficient, small plate plane directivity coefficient, and small ratio of material yield strength to elastic modulus. For the separation process, it is not necessary for the material to have good plasticity, but it should have a certain plasticity. The better the plasticity is, the harder it is to separate the material.

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4. Select a reasonable method for preparing blanks in mechanical manufacturing, which can directly use profiles, casting, forging, stamping and welding. The selection of blank is related to the specific production technical conditions, and generally depends on the production batch, material properties and processing possibilities.

5. Specify the processing cost of parts with appropriate manufacturing accuracy and surface roughness. The processing cost of metal stamping parts will increase with the improvement of precision, so the surface roughness of metal stamping parts should also be properly specified according to the actual needs of mating surfaces.

6. The stamping oil used in the processing of automobile parts shall meet the process requirements. The special stamping oil with excellent performance can significantly improve the processing environment and improve the precision of the workpiece.

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Four elements of mold processing accuracy:
1. Dimensional accuracy refers to the degree of conformity between the actual size of the part after the mold processing and the tolerance zone center of the part size. Dimensional accuracy is controlled by dimensional tolerance. The dimensional tolerance is the allowable variation of part size in die processing. When the basic dimensions are the same, the smaller the dimensional tolerance and, the higher the dimensional accuracy.
2. Shape accuracy refers to the degree to which the actual geometric shape of the part surface after the mold processing is consistent with the ideal geometric shape.

3. Position accuracy refers to the actual position accuracy difference between the relevant surfaces of the parts after machining of Huangjiang die. The items for evaluating the position accuracy include parallelism, perpendicularity, inclination, coaxiality, symmetry, position, circular runout and total runout. The position accuracy is controlled by the position tolerance, and the position tolerance of each project is also divided into 12 accuracy levels.
4. The relationship among dimension precision, shape precision and position precision. Generally, when designing machine parts and specifying the machining accuracy of parts, attention should be paid to controlling the shape error within the position tolerance, and the position error should be less than the size tolerance. That is, the shape accuracy of precision parts or important surfaces of parts shall be higher than the position accuracy, and the position accuracy shall be higher than the dimension accuracy.