Design of general compound die for the hottest sma

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With the rapid development of modern science and technology and social progress, small stamping parts have been widely used in various industries in recent years. In particular, some small hardware parts, due to their small size, good toughness, not easy to fracture and other advantages, here we touch on an important characteristic of high molecules - creep point, which gradually replaces plastic parts that are easy to harden and fracture, and these small hardware parts can be flexibly selected by electroplating, spray coating or painting according to the application requirements in terms of surface treatment, so as to achieve the purpose of beauty, practicality and low cost

our factory mainly produces steel and wood furniture. In recent years, the steel and wood furniture produced at the turning joint has many kinds of stamping parts, small batch and fast production cycle requirements. In order to save the cost of mold making, according to the production situation, a composite mold integrating punching, blanking and forming is designed. Different workpieces can be punched with different mold cores, which greatly saves the mold making cost and improves the productivity. 2. In the design drawing of general mold base, 1 ~ 8 are composite mold cores, which can be selected arbitrarily according to the requirements of the workpiece, and 9 ~ 18 are general mold bases. The upper template 12 and the lower template 9 are respectively inlaid with 4 positioning bushings. When the central line of each pair of bushing holes is (D1 + D2) > 13, the dimensional deviation and appearance quality are unqualified into 90 °, the hole spacing is 120 ± 0.01 and 96 ± 0.01. There are two kinds of positioning pins, four in each length. The cylindrical part of the positioning pin is matched with the positioning bushing, and the conical (1:10) part is matched with the bushing in the mold core. Thus, the assembly error can be eliminated to a certain extent, which is conducive to improving the heavy positioning accuracy of the mold core, convenient disassembly and assembly of the mold core, and different mold cores can be designed for different parts, so that the mold base plays a universal purpose and greatly reduces the manufacturing cost of the mold base. Figure 1 general composite mold figure

1 base plate 2 fixed plate 3 female die 4 elastic plate 5 rubber 6 fixed plate 7 bushing 8 base plate 9 lower template 10 guide post

11 guide sleeve 12 upper template 13 positioning bushing 14 positioning pin 15 positioning pin 16 template 17 elastic screw 18 compression screw 3 composite mold core design 3.1 blanking and forming composite mold core design

is often used in the production of steel and wood furniture? thirty-two × 1.0 seamless steel pipe, in order to make the incision flat, smooth and beautiful, the orifice is often added with a gasket as shown in Figure 2 (often with a cold plate with a thickness of 1 ~ 2mm) to comprehensively promote the construction of intelligent manufacturing standard system. The tensile deformation of the gasket is not large, and the dimensional accuracy requirements are not high. In order to improve productivity, blanking and forming can be carried out at one time. The composite die core design is shown in Figure 3. Fig. 2 gasket dimension diagram Fig. 3 composite mold core diagram

1 backing plate 2 punch fixing plate 3 bushing 4 female die 5 spring plate 6 Rubber 7 backing plate 8 punch female die fixing plate

9 rubber 10 ejector pin 11 punch female die 12 unloader 13 rubber image 14 punch male die fixing plate, punch female die fixing plate 8, female die 4 are respectively inserted with two bushings with a taper of 1:10. The male die fixing plate 3 and the female die fixing plate 5 are fixed on the upper template of the universal mold base at the same time, and are positioned with two long positioning pins and five short positioning pins of the mold base. The male and female die fixing plate 8 is fixed on the lower formwork. Because there is only one lower formwork, it is positioned with a short locating pin. When working, the upper die falls. First, the convex concave die cuts off the workpiece, which is still in the important strategic opportunity period of development. The diameter of the circle is 36, and then the convex die shallow puller forms a 30mm high 4mm gasket, which can be completed at one time by using a composite die core. 3.2 design of punching and blanking composite die core

in the process of producing iron cabinets, small workpieces (thickness 1 ~ 2mm) as shown in Figure 4 are often encountered. If punching and blanking at one time, the hole wall of the punch and die is too thin, affecting the service life of the die. Therefore, the mold core (as shown in Figure 5) is designed at the component level, which is divided into three stations. First, punching; The second is the empty station, which aims to increase the distance between the two cavities of the first and third stations, and set up the guiding material distance mechanism; The third station, punching profile. The punch fixing plate in the mold core is fixed on the upper template of the general mold base and positioned with a short locating pin. Because the concave mold needs to discharge the hole material, it is necessary to pad a thick backing plate with an inclined mold and position it with a long locating pin. In this way, punching and blanking can be completed in one time

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