First, the thickness of the mold kernel
The determination of the thickness of the mold kernel needs to consider the basic thickness required after adding the cooling water pipe and the thickness to maintain the strength of the mold kernel. The main consideration of mold kernel strength is to withstand the injection pressure, so as not to deform the template due to the injection pressure, which in turn causes the product to produce burr. Mold kernel strength design needs to be taken into account
a. Injection pressure
b. Product projection area
c. Product height
d. Product thickness
e. Product appearance
f. Product projection appearance
g. Total number of cavitys.
Second, the mold kernel safety size design
The number of holes and the configuration of the runner, the safety distance between the cavity, and the safety distance from the cavity to the edge of the mold kernel are as follows:
The safety distance Sa & Sb is able to resist the lateral force applied by the injection pressure on the sidewalls of the mold during molding.
Product (part) width + 2 Sa = mold width
Product (part) length + 2 Sb = mold length
Third, the mold kernel safety size reference table
Note: When the mold is designed, the designer will be required to take the mold kernel size as an integer, so the safety distance is not a fixed value; it can be adjusted according to the size of the product (part).
Fourth, the mold kernel safety size setting
1. When designing the mold, first estimate the size of the mold kernel, and then estimate the size of the mold base (mold base).
2. The focus of estimating the size is how to determine the safety distance. The choice of safety distance has a great impact on the cost of the mold!
3. According to the size characteristics of the product and the preparation of the product to determine the size and thickness of the mold kernel, according to the width of the mold kernel must be placed between the two mold feet, the length of the mold kernel as far as possible does not exceed the distance of the back to the position to determine the size of the mold base.
Fifth, from the product (parts) size to estimate the thickness of the mold kernel
Sixth, the determination of the height of the inner mold
The front inner mold does not burst, can pass the water and the screw is as thin as possible, and the rear inner mold is as conservative as possible to prevent deformation
Note: 1. Rear inner mold height: minimum glue level to rear mold bottom Y= X + (10-20)
2. The front and rear mold boxes are generally integers
3. The front mold can be low or low, and the back mold can be thick
7. Factors to consider in the choice of mo ren
1. Generally speaking, after the product projection area (including the cavity) is determined, the projection width is unilaterally added 20mm ~ 50mm for the recommended size of the mold kernel; after the size of the mold kernel is known, the width after the mold kernel width + ( 0 ~ 10) is about the pitch spacing of the mold foot, and the size of the mold base is determined accordingly.
2. The consideration of the size of the mold base is whether the mold base will be deformed due to excessive injection pressure during the molding process. Therefore, when the product is thinner and the number of mold holes is larger, the size of the mold kernel should be larger (such as 50mm on the one side of the projection). The product is thicker, and when the mold kernel is single,The mold kernel can be closer to the product size (such as 25mm on the one side of the projection).
3. If the mold base has a slider or a slant, the size of the slider and the slant must be taken into account.
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UG 3D modeling, assembly design, engineering drawing, motion simulation, reverse design, finite element analysis