Method for producing automobile rear side member semi-closed drawing die
A process method and semi-closed technology, applied in the direction of manufacturing tools, forming tools, metal processing equipment, etc., can solve the problems of difficult production and quality management, short service life, lag in production tact, and reduce product scrap rate, The effect of improving service life and reducing labor intensity
Active Publication Date: 2014-08-27
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology
[0004] (1) The product is easy to crack and wrinkle, and the surface quality is poor, which can only reach grade D;
[0005] (2) The product scrap rate reaches about 10%;
[0006] (3) The production beat is seriously lagging behind (in this industry, the general production beat of stamping production is 8 to 10 times, and the production beat in the current process is 3 to 3.7 times);
[0008] (5) The mold wears seriously, the maintenance frequency is high, and the service life is short;
[0009] (6) The material utilization rate is only 31%;
[0011] To sum up, the cost of automobile rear longitudinal beams manufactured by closed drawing dies is high, and the production and quality management are difficult, the production load carried by machine tools is large, and the labor intensity of workers is high; in addition, because automobile rear longitudinal beams are prone to appear Cracking, wrinkling and other bad defects, production support personnel and product inspection personnel and the frequency of inspection have greatly increased, increasing the difficulty and cost of production management
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[0040] Now in conjunction with accompanying drawing, the present invention is described in further detail:
[0041] see figure 1 , figure 2 with Figure 4 , the process method of manufacturing automobile rear longitudinal beam semi-closed drawing die of the present invention, its steps are as follows:
[0042] Step 1, build the process digital model of semi-closed drawing die 2;
[0043] Step 2: Analyze the defective products of the rear longitudinal beam of the automobile whose cross-section is "U" shaped mouth 1 manufactured by the existing closed drawing die 3, and determine the defective product of the "U" shaped mouth 1 of the rear longitudinal beam of the automobile. Springback value and twist value, and put the springback value and twist value in the process digital model of step 1 to repeatedly perform CAE simulation analysis, and repeatedly adjust the process rebound amount of "U"-shaped mouth 1 to control the process digital model The rebound amount is 0.1mm (t...
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The invention relates to a method for producing an automobile rear side member semi-closed drawing die. An existing process is analyzed by a computer aided engineering (CAE) analysis method, semi-closed drawing shape of the existing process is gradually analyzed, then a corresponding process digital model is established, scanning analysis is performed on a drawn product by means of a white light technology, the semi-closed drawing compensation dosage is still, and undesirable phenomena about product surface qualities, tolerance, resilience, distortion and the like are gradually eliminated. An automobile rear side member which is produced by the automobile rear side member semi-closed drawing die achieved by the method has the advantages that the resilience is small, problems of product wrinkle and cracking in the drawing process can be solved, meanwhile, the product rejection rate is reduced, the service life of the die is prolonged, and the material using ratio is increased.
Description
technical field [0001] The invention relates to a semi-closed drawing process method, in particular to a process method for manufacturing a semi-closed drawing die for an automobile rear longitudinal beam. Background technique [0002] In the process of automobile production, the rear longitudinal beam is made of high-tension laser welding plate (the yield strength of the plate reaches 440Mpa, and the elongation of the material is ≤18. The product itself requires: the surface quality reaches the B-level surface standard; the entire surface deformation control does not exceed 0.05 mm; springback control does not exceed 0.05mm; laser weld tolerance +3, -7mm; trimming line tolerance is ±0.25mm) for product design. [0003] Such as Figure 5 As shown, the closed drawing die 3 is used for forming, and the following problems are likely to occur in the product and production: [0004] (1) The product is easy to crack and wrinkle, and the surface quality is poor, which can only rea...
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IPC IPC(8): B21D37/20
Inventor 刘小军李栋
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD