Today I will show you a DFM report.
1. The first is product information. This page tells about the names of the parts that need to be placed in a set of molds, and the front and back screenshots.
2. This page is the mold information, including the material of plastic parts, surface treatment, number of mold holes, mold core material, finished product size, and mold form.
A few points to note: the number of mold cavities is related to the total demand, the greater the demand, the more the better the number of cavities; generally the best mold core material is S136; the mold base model has two boards For molds and three-plate molds, those that need to automatically drop the nozzle are designed as three-plate molds. The cost of the mold will be relatively higher, but the labor cost of a single piece is saved without cutting the nozzle.
3. The key points of the product include which surfaces need to be polished and which surfaces need to be textured. Whether the design involving the draft angle is reasonable, especially the exterior surface.
4. The parting line on this page mainly describes the parting of the front and rear molds. Generally choose to design the parting line in a relatively obscure place (secondary appearance surface). If it cannot be hidden, it is necessary to make a straight line or a curve close to a straight line as much as possible, so as not to complicate the mold processing. Although there is no undercut on the side of this part, it is necessary to make side sliders for parting. The reason is that no draft angle is allowed on the side, which will affect the assembly. This is the most important thing.
5. This is what the parting line looks like from another page.
6. This picture is the parting line of another part. The side holes all need to make outer sliders or inclined roofs to release the mold.
7. This page focuses on the parting line of this inclined roof.
8. Selection of glue inlet point: to ensure the best size and minimum deformation. Generally, long strip parts will be glued at 1/3. The advantage of this is that there will be no problem of size. The so-called size head means that the size of the end close to the gate is large, because the pressure loss of injection molding is small, and the pressure loss of the end far away from the gate is large, and the size will be smaller. Such problems are very harmful to both assembly and appearance. As for why it is not placed in the middle, it is because there is a risk of breaking easily.
9. The glue feeding method of the two parts is basically the same.
10. There are three points to pay attention to in the design of the water delivery hole. The first is that for high-gloss parts, the master mold side needs to be transported directly to the top, which is most helpful for the high-gloss effect; the second is that the diameter of the water control should not be too small, so as not to cause insufficient water temperature and the mold temperature cannot reach; third. That is, the design of water transportation needs to consider future design changes. Generally, wire cutting inserts are required for glue reduction. If the wire cutting will damage the waterway, it will bring great trouble to the mold repair.
11. Here is the water delivery on the male side.
12. The design of thimbles: first, it should not be too small. Insufficient number of thimbles will cause difficulty in demoulding, and the finished product will stay in the male mold The second is that the thimble cannot be designed in the part where the wall thickness is too thin, which will easily cause thimble marks on the back, and the latter is a phenomenon of partial bursting.
13. The thimble arrangement of another hole.
14. Analysis of draft angle. The draft angle of the exterior surface needs to be evaluated at the initial stage of product development, otherwise it will easily cause major changes later and affect the delivery date.
15. Analysis of the mold release angle of the outer slider.
16. Analysis of the mold release angle on the appearance surface.
17. Analysis of the mold release angle of the rear mold.
18. Analysis of the mold release angle of the slider in another hole.
19. Thickness analysis is mainly to check the hidden dangers of thick and thin printing and shrinkage. If there is a partial thickness, it is necessary to remove the glue as much as possible to make it even.
20. The red part is generally a thicker place, and you should pay attention to a large area of red.
Complete report.
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