Medical Injection Mold Processing Ideas

Generally speaking, the requirements for medical injection molds are relatively strict. When making goods and processing, we should also look for experienced manufacturers. Today, the editor will share with you some medical injection mold processing ideas:

1. If the injection molding is a two-color part, the structure should be simplified as much as possible, and the complicated part should be on the top of the mating part. The width of the rib of the non-transparent part should be 0.5-0.6mm as much as possible to avoid shrinkage.

2. The mold base guide post and guide sleeve must be symmetrical up and down, and the front and back molds must be symmetrical.

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

4. The product spacing must be based on the spacing of the nozzles of the injection molding machine. The nozzle spacing of some foreign two-color injection molding machines is adjustable, some are not adjustable, and the domestic one is not.

5. Two independent ejector systems and two ejector rods. The two products of the back mold are the same, and the thimble is the same. It is a rotation relationship, and it must not be made into a translation relationship.

6. The thimble plate can only be reset with a spring, and a screw cannot be used for forced reset, because the rear mold needs to rotate.

7. The side locks must be on the four sides of the center of the mold, and the front and rear molds are symmetrical. Otherwise, it will be bad if the rear mold does not align with the front mold after rotating 180 degrees.

8. If the distance between the glue feeding point and the nozzle of the injection molding machine is different, the top rod hole should be made into a waist shape, because the top rod spacing of the injection molding machine is not adjustable. Note that most injection nozzles of domestic two-color injection molding machines are not adjustable.

9. Note 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 the product ranking.

10. The direction of the water in and out of the water must be on the side of the sky and the earth, and each circulating water must be on the same surface. The water can not enter the sky and the water outlet is on the ground side, because the back mold must be rotated 180 degrees. Pay attention to the mold base The size cannot exceed the height of the water outlet of the injection molding machine, otherwise the water cannot be transported.

11. The product for the first injection should be placed on the non-operating side, because after the first injection, the product has to be rotated 180 degrees for the second injection, and it just turns to the operating side for easy access to the product.

12. The code position of the export mold should be on the operating side and the non-operating side, not on the world side, because their products must be fully automatic.

13. Precautions for parting surface: The parting surface of the rear mold must be the back mold after the two products are merged; the parting surface of the front mold must be a single product, and the merged product is not acceptable. Parting surface.

14. The tolerance of the front and rear flanges is minus 0.05mm, the tolerance of the distance between the two flanges is plus or minus 0.02mm, the gap between the top rod and the top rod hole is 0.1mm on one side, and the center distance tolerance of the front and rear mold guide bushes is positive and negative. 0.01, the four sides and depth of the mold frame must be added with tolerance, otherwise when the back mold is rotated 180 degrees, the height will be inconsistent and cause a sharp edge. The frame depth tolerance is minus 0.02mm.

15. If the mold embryo has been processed in the mold embryo factory, when the factory wants to process the nozzle and the top pin hole, the number should be taken based on the spacing center of the 4 guide post and guide sleeve holes, otherwise the deviation is too large and it is easy to get stuck. Die. When ordering the mold blank, it is necessary to indicate that it is a two-color mold blank, the four guide posts and guide sleeves are symmetrical to the frame, and the rear mold can be matched with the front mold after rotating 180 degrees.

16. If it is a two-color rotation of the back mold, it is much simpler.. The two front mold cores are the same...After the hard rubber is injected on one side. Rotate 180 degrees (note that the product cannot fall when it is rotated, and the gate can be automatically separated ), turn to the other side and then inject the soft rubber...Inject hard rubber without arranging the thimble...Just arrange the mold core on the soft rubber side...In addition, pay attention to the shrinkage...If the soft rubber is completely used If the hard glue is entangled.. Just put the hard glue to shrink... If the outline is connected, the hard glue and soft glue will shrink.

17. If it is a two-color mold of a set of molds, it is a straight barrel and a 90-degree barrel to shoot glue. It does not need to be rotated. Only one mold core is needed. The separation method of soft and hard glue depends on the position sealing. glue.