Stamping process and die design of the hottest end

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The stamping process and die design of the end cap

[Abstract] this paper introduces the improved design of the end cap, briefly analyzes the stamping process and die design points under the condition of mass production, and expounds that the electronic universal experimental machine is widely used in the material inspection of factories and mining enterprises, quality supervision, aerospace, machinery manufacturing, wire and cable, rubber and plastic, textile, construction materials, household appliances and other industries, and analyzes the advantages of changing castings into stamping parts Viability, economy, etc

keywords end cap stamping process mold design

1 introduction

end tariff! overhaul! PC materials this is the rhythm of rising! Cover is a kind of part of a general-purpose machine, which is used in a large number (6-8 pieces per set). It was originally cast iron, as shown in Figure 1. Its technological process is: casting machining (turning and milling). It has many processes, long production cycle, high material consumption, low efficiency and high cost, and cannot better meet the needs of production development. After analyzing and studying the structure and use requirements of this part, the author changed it into a stamping part on the premise of not reducing the use performance, as shown in Figure 2. The material is 08F and the thickness is 1mm. The parts are processed by stamping. Practice has proved that the process is feasible, efficient and low cost. The operators who first use the equipment should be instructed by skilled operators, and the economic benefits are remarkable

2 process analysis and determination of process scheme

stamping is a more advanced processing method in the mechanical manufacturing industry. Compared with cutting, it has the advantages of high material utilization rate, good mechanical properties of products, strong interchangeability and high production efficiency. Yu has great advantages in both economy and technology. The purpose of changing casting parts into stamping parts is to improve cattle productivity, reduce costs and increase economic benefits. However, whether it is feasible requires the following conditions: ① the original service performance requirements must not be reduced after the product is improved; (2) The products must have a considerable production batch (2000 pieces per month); (3) The improved parts should have good stamping processability. After careful analysis of the original parts, it is recognized that it is feasible for the production enterprises to take price reduction measures to maintain the profit situation. It is changed to the structure in Figure 2, and the stamping process is analyzed. The main technical difficulty lies in the formation of four bosses, whose relative height is relatively high, and the distance between the bosses is relatively small. Therefore, in the forming process, the material deformation is complex, especially the inner side of the foot boss and the arc part between the two bosses, and the material supplement is difficult, It is difficult to meet the requirements only by thinning and stretching, and it is easy to crack. After fully considering the forming conditions and the analysis of stamping process difficulties, the key points of stamping process after improving the design are proposed: ① pre punching the central hole to improve the material flow inside and between the four bosses; ② The blank is made into a square so that the four corners can be supplemented with materials for four bosses from the outside. ⑦ the method of first stretching the four bosses to a certain height and then dropping the excircle of the workpiece is adopted, so that the materials can be easily supplemented during the drawing process, and the excircle is relatively accurate (before the next process, there is no need to repair the excircle edge)

based on the above analysis, it is determined that the stamping process is as follows: two composite processes (two sets of dies) are used to complete the blending. The first process: punching the core pre hole - pulling the boss bucket - blanking. The second process: punching (trimming the inner hole edge)

3 die structure

3.1 punching center pre hole drawing blanking composite die

punching drawing blanking composite die is shown in Figure 3, which adopts the rear sliding guide die base and positive installation structure. The working process is as follows: in the mold opening state, first place the sheet metal on the blanking die 3 and punching die 4, position the retaining pin 6, start the press, slide block f line, and the elastic unloading plate 7 compresses the sheet metal under the action of spring 9. With the decline of the slide block, punch the center pre hole of the sheet metal first, and then pull four bosses. When the boss is stretched to form, that is, the pulling depth is 5mm, the blanking punch 10 and blanking die 3 begin to drop, The sliding block continues to descend to the bottom dead center, and the upsetting and pressure calibration is carried out for the parts. In the process of sliding block, the elastic unloading plate 7 will unload the waste, the material striking plate 16 will push down the workpiece, and the waste of central pre hole will leak out from the lower die to complete the processing of the first process

3.2 problems that should be paid attention to

the assembly of punching drawing bucket blanking composite die must be ensured. The sequence of starting work is: punching center pre hole - stretching 4 bosses - blanking, that is, when the upper planes of middle parts 3 and 4 of the lower die in Figure 3 are flush, the lower working surface of upper die 15 is the lowest, the forming convex part of Part 10 is the second, and the blanking punch (the outside of Part 10) is the highest

after mold test and adjustment, the pressing and unloading parts should ensure that the blank holder and unloading force are appropriate, the action is smooth, and the function meets the working requirements of the mold

3.3 punching (trimming inner hole edge) drawing composite die

punching (trimming inner hole edge) - the drawing composite die is shown in Figure 4. It adopts the rear sliding guide frame and flip-flop structure, which is used to complete inner hole trimming and outer edge stretching. Its working process is simple and will not be repeated

4 conclusion

after the actual production verification, after the above structural improvement design and process improvement of the end cover, under the condition of fully meeting the use requirements, the production efficiency is greatly improved, the dimensional stability of the product is increased, the material consumption is reduced, and the manufacturing cost is reduced by 20%. If a single piece saves 2 yuan and the output of this model is 50000 sets/year, the direct savings are: 2 yuan/piece * (6~8) pieces/set * 50000 sets/year =600~800 thousand yuan/year, and the economic benefits are very considerable

the above methods can be used for reference for similar products. Using the same method, the factory has made corresponding improvements to the same series of parts, and the effect is good

making full use of modern manufacturing technology to improve the structure, optimize the design and optimize the process methods of traditional mechanical parts is an important way for the machinery industry to tap the internal potential, improve efficiency and increase benefits

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