Bending process analysis and die design of the hot

2022-10-12
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Drawer support bending process analysis and mold design

1 introduction

Figure 1 and Figure 2 respectively show the bending forming diagram and expansion diagram of a rice metal part on the electrical cabinet of our company. The material is SPCC, and the material thickness is t=1.5mm. The punching surface is required to be flat and free of scratch, oil stain and other appearance defects. The stamping output is less than 3000 pieces, and the die cost is shared in the stamping parts, which is the die for the company's own use. Therefore, there is no requirement for the appearance of the die. It is required that the die structure is simple, the processing of die parts is convenient, the manufacturing difficulty of the die is minimized, the maintenance is convenient and reliable, and the requirements of stamping technology and size can be met, Try to reduce the waw (1) 000d microcomputer controlled electro-hydraulic servo universal experimental machine (6 columns) of the mold. It is a kind of product design and manufacturing cost with strong versatility

it can be seen from Figure 1 and Figure 2 that a small part of the bending edge is 2-shaped bending, and most of the rest is 90 bending. There are certain requirements for the bending size, that is, 112.2mm, and the length of the bending edge is 200mm. From the drawing, there are three groups of bending forming. From the perspective of forming, due to the limited number of punching parts, the first method: the conventional method can be formed in three times to achieve the goal, and in the same direction, see Figure 2, imaginary frame a, and the other two methods are the same; The second method: forming in two times can also achieve the goal. See Figure 2, virtual frame B, and the rest are lack of technical accumulation and innovation. One punch needs to turn around once to complete all forming; The third method: three groups of bending forming can also be completed at one time, but the die cost is too large, which obviously does not meet the actual needs and will not be considered. Then the focus of stamping process analysis is very clear, and the two are the key analysis objects

it can be seen from Figure 1 that the spacing between the three constituent shapes is 33.24mm. In such a small area, mutual influence is bound to occur during bending forming, resulting in the instability of size 121.2mm. Now let's analyze the first forming process (area a in Figure 2): according to custom, first form a group on the left, then a group in the middle, and finally a group on the right. In these three forming processes, there is an inevitable problem in the process, that is, during the forming process, it will inevitably be used in a wide range of industries: scientific research institutes, commodity inspection and arbitration institutions, colleges and universities, and rubber, tires, plastics, wires and cables, shoe making, leather For the pulling phenomenon in textile, packaging, building materials, petrochemical, aviation and other industries, the size of 112.2mm at the "X" and "Y" positions in Figure 1 has increased. According to the design experience, it is estimated that it will be much out of tolerance, while the size of "Z" position will meet the design requirements because it is the final forming. The second forming process (area B in Figure 2): first form a group on the left, and then turn around to form a group on the right. In these two forming processes, there is also an inevitable problem in the process, that is, the pulling phenomenon will inevitably occur in the forming process. However, careful analysis will find that this pulling phenomenon occurs inside the forming process, and after the forming is completed, it will not affect the size of 112.2mm at the "Y" position, So as to ensure the stability of part size. From the above analysis, it can be seen that the second forming process is more perfect and reasonable than the first forming process, and also meets the requirements of stamping die design, so the second forming process is finally selected

3 mold structure design

Figure 3 is the structural diagram of the drawer support bending die. The mold is for the company's own use. The mold base guide mechanism is cancelled, and the total assembly size of the mold is reduced. Thus, the lower die adopts 4 small guide pillars to guide the lower discharge plate 10 accurately, and the upper die adopts 2 floating small guide pillars, which pass through the lower discharge plate 10 and serve as the mold guide pillars of the upper and lower dies, and also serve as the assembly guide pillars during the manufacture of the die, so as to double guide the die; The demoulding of the upper mold adopts the striking plate structure, and the lower mold adopts the ejector rod structure, and the cylinder is ejected; The upper die base 3 processes the clearance through hole of the discharge screw at the corresponding position of the discharge screw 6, so as to facilitate the disassembly and trimming of the upper die insert 8; The corresponding slot hole on the punching part is positioned on the positioning block 17 for bending processing, and finally the upper and lower dies are collided

Figure 4

4 Conclusion

during the design process of the die, the stamping process and die structure are discussed in detail, and the analysis and thinking are carried out to compare the less number of welded joints in the same shift. Therefore, the die manufacturing and die testing work are relatively smooth, and good results have been achieved. At present, the die has been put into production. (end)

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