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Molded plastic mounting plate design

For molding plastic parts, plastic parts and to the flow direction and pressure in the same direction, to set the cavity at the bottom. So easy to feed, easy to plastic flow. Pressure through the die to the adhesive on the inside pieces of the direction of pressure, so easy to load plastic powder. And the pressure can be effectively used to facilitate the top of the molded part, to prevent deformation of plastic parts, simplified mold structure. 2005. No. 10 Total 55 r a 1l1r-| one. --- __ I, __ a J__ a l1 ----- 1. On the roof 2. Short push rod (on) 3. Long push rod (on) 4. Screw 5. Pin 6. Cover 7. Upper die 8. In the 3.6 Core (2) 9. Lower die 10. Under the guide post 11. The short end of mold 12 mandrel 13. Long push rod (below) 14. Under the roof 15. In the mold 16. Handle 17. Sleeve 18. Pin 19. In the 3-3 core (20) 20. Figure 2 on the guide post mounting plate molded plastic structure (2) in the mold cavity and the cavity is a common component feeding, so the open end of the module design is very important. Well designed, can make a smooth compression molding, plastics of good quality. Figure 3, the population in the mold design of a small fillet at R2, and some take 1 / 3 ~ 1/4H, height 12 1. Slope,[link widoczny dla zalogowanych], which played three roles: 1) to reduce mold and plastic parts on the top of the time and the friction between the side wall. 2) to enable easy access to the upper die. 3) facilitate the exhaust steam, waste steam can be discharged from the slope. So that a smooth plastic powder filled cavity under the model, the production does not bubble out of the plastic parts, burr thin plastic parts to ensure smooth surface. (3) forming part mainly by the upper, middle and lower core die and 3.6 (2), 3.3 Core (20) composition. Figures 3 and 4 is the upper and lower die components map directly determine the size of plastic parts,[link widoczny dla zalogowanych], so they determine their size, will be counted as shrinkage, shrinkage ratio is 0.9%. Upper and lower die size and in shape with sliding mode, the unilateral clearance to take 0.05-0.1 mm. On top of mold with the top and the mold to prevent the melt overflow, and a guide. The bottom of the forming parts,[link widoczny dla zalogowanych], on both sides of R3 Park Corner, take the child with ten stripping slope 1. And require sub-centers and take the corresponding hole under the center of the same mold. With these conditions, the upper and lower die with the suppression of plastic parts, the plastic powder flows more easily, in order to better suppress the plastic parts of the inner surface and the end. (4), the under part of the roughness in the cavity, determines the roughness of the surface of plastic parts. Also the surface roughness of plastic parts with the cavity one by one ll,, l ... r,, f Yuan. , ' RI Figure 3 mode}, l_,, twenty twenty twenty brother hopane: reduced wear. Therefore, to ensure the quality of plastic parts, we put up, down, in the model are used Crl2 material because Crl2 material is commonly used in high-carbon, high chromium tool steel, and has good hardenability, hardenability, wear resistance , anti-tempering stability and heat deformation small, etc., but the carbide segregation serious change after forging using effect was more significant. So we forged on through the re-processing before use. In order to improve the upper and lower, in the mode of mechanical properties and increase strength. Heat Treatment on the mode HRC55 ~ 60, lower die and the die HRC52 ~ 56. And using technology to processing of cutting, down,[link widoczny dla zalogowanych], in the cavity, leaving 0.05 ~ 0. O8 grinding margin, with research matte polished cavity, the cavity to ensure high accuracy and surface roughness. Polished,[link widoczny dla zalogowanych], hardened, the suppression of plastic flow easily when the plastic powder to prevent sticking plastic mold cavity mold and wear, improve die life. 3, molding process conditions a closed adhesive because it is mold, rough operation should be strictly controlled the weight, I plant is a good balance, said plastic powder weight. The first is preparation, forming when warm: mold preheating temperature is 90 ~ C ~ 100 ~ C, for 6 minutes to 15 minutes. Forming pressure> 250kg/cm; forming temperature 155 ~ C +5 ~ C, hold time 1-1.5min/mm. To maintain the time to mold. It is worth noting: the mold temperature on the fluidity of the larger, generally more than 160oC, the mobility decreased rapidly. 4 Conclusion The use of plastic molded into the years to produce the plastic parts smooth, flat; no bubble, no half-cooked, and only vertical fly edge (burr), remove the line. Fully meet the customer satisfaction requirements. ...''-2o a 11, an R1 of a ¨ 3'I one by one [f 『』 a l-second Ij_L; two -[_==-_ a I = IrjlI-I: 7f} J = f) · 545. . I2 a 60. sx4s. JiI - 2 a ¨ o7: Figure 5 under the model reference Plastic mold design manual. Beijing: China Machine Press, 1982.1 Wong

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