What experience do you have in the design of two-color injection mold? Let me take a look at it for you! Welcome everyone to have a look!

1. Basic principles of two-color injection mold design;

(1) hard rubber 1 time, soft rubber twice;

(2) Transparent 1 time, opaque for 2 times;

(3) The plastic with high injection temperature is 1 time, and the plastic with low injection temperature is 2 times;

2. The guide post and guide sleeve of the mold blank must be symmetrical up and down, left and right, and the front and rear molds must be symmetrical.

3. The back mold should rotate 180 degrees, and the front mold should not move.

4. The product spacing must be based on the spacing of injection molding machine nozzles. Some of the nozzle spacing of foreign two-color injection molding machines is adjustable, some are not, and neither are domestic ones.

5. There are two independent ejection systems and two ejector pins. The two products of the back mold are the same, and the thimble is the same. It is a rotating relationship and must not be translated.

6. The ejector plate can only be reset by spring, and cannot be forcibly reset by screw, because the rear die will rotate.

7. Side locks must be at the four sides of the center of the mold, and the front and rear molds are symmetrical. Otherwise, when the rear die rotates 180 degrees, it will be broken if it cannot be centered with the front die.

8. If the distance between the glue inlet points is different from that between the nozzles of the injection molding machine, then the holes of the ejector pins should be waist-shaped, because the distance between the ejector pins of the injection molding machine is not adjustable. Note: Most injection nozzles of domestic two-color injection molding machines are not adjustable.

9. Pay attention to the fact that the injection molding machine provided by the customer is parallel to the nozzle direction, whether it is the X axis or the Y axis, so as to determine the layout of product ranking.

65438+

1 1. The product injected for the first time should be placed on the non-operating side, because after the first injection, the product should be rotated by 180 degrees for the second injection, just turning to the operating side, which is convenient for taking the product.

12. The code location of export molds should be on the operating surface and non-operating surface, not on the side of heaven and earth, because their products should be fully automatic.

13. Notes on parting surface: The parting surface of the back mold should be the back mold after the merger of two products; The parting surface of the front mold should be a single product, and the parting surface of the combined product is unacceptable.

14. The tolerance of front and rear flanges is 0.05mm, the tolerance of distance between two flanges is 0.02mm, the gap between ejector pin and ejector pin hole is 0.65438±0mm, the tolerance of center distance between guide posts of front and rear modules is 0.065438 0, and the four sides and depth of formwork should be tolerance. Otherwise, when the rear die rotates 180 degrees, the depth tolerance of the frame is negative 0.02 mm.

15. If the mold blank has been processed by the mold blank factory, the distance center of the four guide post guide sleeve holes should be taken as the benchmark when the factory processes the nozzle and ejector pin holes, otherwise the deviation is too large and the mold is easy to get stuck. When ordering the mold blank, it should be indicated that it is a two-color mold blank, and the four guide posts, guide sleeves and frame are symmetrical. After rotating 180 degrees, the rear mold can match the front mold.

16. If it's a set of two-color molds, it's a straight barrel with a 90-degree' gun barrel. It doesn't need to be rotated, but only needs a mold core. The separation method of soft glue and hard glue depends on the line position to seal the glue.

17. The two shapes of the cavity are different and form a product respectively, while the two shapes of the core are complete.

18. The front and rear dies of the mold rotate around the center 180? After that, they must match. This check must be performed at design time.

19. Pay attention to the position of the pinhole at the top, and the minimum interval is 210 mm. For large molds, the number of ejector pin holes should be appropriately increased, and because the ejector pin attached to the injection molding machine itself is not long enough, our mold needs to design an extended ejector pin, and the ejector pin extends out of the bottom plate of the mold blank by about150 mm.

20. Two locating rings must be designed on the bottom plate of the rear die.

2 1. The total thickness of the front template panel and A plate shall not be less than 170 mm ... Please carefully check other reference data of this type of injection molding machine, such as maximum mold thickness, minimum mold thickness, ejection hole spacing, etc.

22. The depth of the front sprue should not exceed 65 mm. The distance from the top of the upper sprue to the center of the blank should not be less than150 mm.

23. When designing the cavity for the second injection molding, in order to prevent the cavity from being inserted into (or rubbing against) the glue position of the first molded product, local gaps can be designed.

24. During injection molding, the size of the product molded by the first injection molding can be slightly larger, so that it can be pressed more tightly with another cavity during the second molding to achieve the function of sealant.

25. The water delivery arrangement of the two cavities and cores should be as full and balanced as possible.

26. Two-color injection mold, you must carefully choose the gate position. It is best to choose latent gluing for primary products, so that the product and the flow channel can be automatically cut off. When it is impossible to use the submerged glue feed, three-plate mold or hot runner mold can be considered. If the primary material is a point gate, it should be wavy to avoid touching the secondary material because of the residual primary material.

27. Two-color injection mold often adopts rotary injection mold. The punch/die in two positions of the rotary injection mold should be consistent in size and accuracy, and should be well matched with the die/punch. When the ejection and demoulding mechanism on the two-color injection molding machine cannot be used, a hydraulic ejection and demoulding mechanism must be set on the turntable.

28. Two-color injection mold Injection molding usually uses the same plastic with different colors or two different plastic raw materials. At this time, it is necessary to consider the interface effect, shrinkage difference and processing parameters of the two materials.

29. Generally speaking, the shrinkage rate of two-color mold depends on the main material. Because the primary material has supported the contour of the plastic product, the secondary material will not shrink any more. As for how to determine the primary and secondary materials, there are many factors to be considered, such as the fluidity of raw materials, the shape of plastic products and so on.

30. Pay attention to the positioning of the front and rear dies. The clearance between all inserts and the inclined plane of the section should be as large as possible, which should be greater than 0.1mm ..;