What is the common basic knowledge of mold design and the basic knowledge of mold structure

The basic knowledge of mold structure is as follows:1. The resistance of plastic flow in the mold is large, and it will be difficult to form with complex shapes.

2. Set the fillet (r position) to increase the strength, so that the plastic parts will not be deformed or cracked.

3. In order to ensure the strength and rigidity of the product, and not to make the wall thickness of the plastic parts, the reinforcing ribs can be set at the appropriate parts of the plastic parts.

Prevents deformation and, in some cases, improves the flow of plastic in molding.

4. Special attention should be paid to the strength of the hole and the size of the hole diameter. If the hole diameter is too large, there will be slippage after driving into the screw, and if the hole diameter is too small, there will be failure to penetrate the screw or burst the screw post.

5. The depth of the aperture should not exceed 8 times of the aperture diameter.

There are many types of molds, which can be divided into according to the processing object and processing technology: Molds for processing metal. Machining molds for non-metallic and powder metallurgy.

According to the molded'Different materials, molds can be divided into hardware molds, plastic molds, and their special molds. According to the structural characteristics, the mold can be divided into a flat punching die and a cavity die with space. So what are the key points of mold design?

I'm going to tell you about that.

1.Generally, the finished flat product should not be glued in the middle to prevent bending and deformation.

2.In normal cases, STP is directly below RP.

3.When the mold base is large, the interval of STP is 150--200mm.

4.The screw interval between the upper and lower ejector plates of the lock is 150-200mm.

5.When there is a thimble below the slider or the oblique tip is broken, the upper and lower ejection plates should be equipped with a forced return mechanism.

6.The draft slope of the finished product is based on glue reduction.

7.When designing the waterway, try not to use the water pipe to directly connect to the mold kernel, but to use the mold inlet pipe"o"Ring coupling mold kernel.

Try to make its diameter as large as possible and arrange it below the orthographic area of the finished product.

9.Three Principles of Cooling Channels aRapid cooling bUniform mold temperature cEasy to process.

10.The bevel tip should be rounded from the center of the mold.

The hole is eccentric with the eccentricity of the injection bushing, and the maximum inclination angle of the injection bushing shall not be greater than 15°.

12.For the parting stroke between the fixed plate and the female template on the two-piece half-mold, the parting stroke should be controlled by the mechanism, and the LP must have an injection guide bushing on the male platen, and generally need to have a LK opener.

13.The method of dealing with the inner barb can generally be used oblique tip, inner slider, peeling plate (ejection middle plate), ejector tip should be avoided under the slider as much as possible, so as not to collide or interfere.

14.Generally, the mold kernel exceeds the finished product contour by 20-30mm, and the mold center should be rounded, and the template is 20-30mm away from the mold kernel frame. ;