Interchangeable design of the hottest analytic shu

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Analysis of the interchangeable design of shunt combined die

1 introduction

the extrusion die towel used in the extrusion of profiles, the shunt combined die used to extrude hollow profiles, due to its complex design structure (as shown in Figure 1), makes the processing process cumbersome, the processing cycle is long, and the processing requires more raw materials. In addition, in the traditional design structure, the most easily damaged upper mold core and lower mold hole are integrated with the upper and lower mold bodies respectively, so that there is no interchangeability between molds of the same specification. When a certain part of the upper mold core or lower mold hole is damaged or the overall mold core or hole is worn and deformed due to long-term use, because it is not interchangeable, the mold can only be scrapped as a whole, which is a design scheme without interchangeability, It will not only cause great waste and increase product costs, but also affect the normal production

in view of the above reasons, if the diversion can be designed in a replaceable form at the upper model core and the lower model hole of the combined die, when the upper model core or the lower model hole cannot continue to be used due to damage, it is only necessary to process the same upper model core or the lower model hole, and replace the damaged core or hole, so as to restore the normal use of the die, which will greatly improve the service life of the die, Save considerable mold material costs and mold processing costs, and can greatly shorten the mold processing period, meet the user's use needs, and ensure the normal production

2design analysis

Figure 2 and figure 3 show the structure of the upper and lower die of the shunt combined die designed according to the traditional design scheme. It can be seen from the figure that since the upper mold core and the lower mold hole are integrated with the upper and lower mold substrates respectively, when the core or hole is damaged and cannot be used normally, the upper and lower mold substrates will inevitably be scrapped, resulting in a lot of unnecessary losses and praise. For this reason, the design scheme of the shunt combined mold is modified into the inlaid electronic (pneumatic) safety protection equipment structure of the upper mold core and the lower mold hole with high efficiency. In a broad sense, as shown in Figure 4, the host distributed more than 3 to the athletes, that is, the upper mold core and the lower mold hole are separated from the upper and lower mold substrates respectively, so that the upper and lower mold structures become inlaid two-body forms. When the substrate is not damaged, Just replace the damaged upper mold core or lower mold hole, so that the mold can continue to be used normally

3 design analysis

3.1 upper die design

it can be seen from Figure 2 that the core of the upper die of the shunt combined die is protruding on the outside of the upper die matrix, and the base part is connected with the matrix. Therefore, the part of the die connected with the core in the upper die matrix must be an entity. In order to realize the connection between the upper model core and the matrix in the form of inlay, a stepped square hole is designed in the matrix connected to the root of the core, as shown in Figure 5. The upper model core is designed to be inlaid with the upper model body as shown in Figure 6, the base root is designed to be square, and the square hole corresponding to the matrix is designed in the form of h8/r7, In this way, the upper mold core and the upper mold body are connected in the form of transition fit. The square design can effectively prevent the insert from rotating in the matrix

since the aluminum material enters the welding chamber of the die cavity from the flow port direction when the shunting combined die is working, in order to prevent the core from being extruded out of the upper die substrate along the working pressure direction under the strong extrusion pressure, the upper die body is designed into a square hole in the form of class. At the same time, the blanking plate as shown in Figure 7 is designed to connect it with the upper die core insert with bolts to ensure that the upper die core insert will not be extruded from the upper die body during extrusion, When replacing, just remove the plug plate and bolt, that is, replace the core, which is simple and easy to operate

3.2 lower die design

for the interchangeable design of the lower die, its design scheme is simpler than that of the upper die, and it is easy to process. Because the lower mold hole is processed and formed in the plane of the welding chamber, according to the stress characteristics during work, when designing the lower mold, the bottom surface of the welding chamber is designed into a ladder form as shown in Figure 8, and the matching lower mold hole is also designed into a corresponding ladder form, as shown in Figure 9. H8/r7 transition fitting form is adopted at the matching position between the lower die base and the hole insert. This stepped design scheme can effectively prevent the hole insert from extruding from the lower die base during extrusion. During assembly, the lower die insert can be directly installed into the lower die base along the step direction, and can be used without other forms of connection, making it easy to disassemble and replace

4 conclusion

this interchangeable design scheme of shunt combined die can reduce and avoid a lot of material waste, shorten the processing cycle of the die, improve the processing speed of the calibrator by 0.2~0.7 degrees, and win valuable time for production. This design scheme is only applicable to the design of single core shunt combined mold. For multi core shunt combined mold, the design scheme of semi embedded and fixed from the core can also be adopted

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