The vacuum forming method mainly includes the vacuum forming of the concave mould, the vacuum forming of the punch mould, the vacuum forming of the concave and convex mold, and the vacuum forming of the blowing bubble.
Plunger push down vacuum molding and other methods.
1. Mold vacuum forming.
The outer surface dimension of the plastic parts of concave mould vacuum forming is high, which is generally used for molding parts with small depth. If the plastic parts are very deep,
Especially small plastic parts, its bottom corner will be significantly thinner. The vacuum forming of the cavity of the multi-cavity cavity is less than that of the same number.
Type saving material, because the distance between the die cavity can be smaller, using the same area of plastic plate, can be processed more plastic parts.
2. Convex mold vacuum forming.
Some requirements of the thickness of the bottom thickness of the plastic parts, can be using the convex mold vacuum forming. The pressed plastic plate is softened by the heater.
Then the softening plate is moved down, and the heated plate is first exposed to the convex mold, which is to be cooled and lose the ability of thinning. The clamping
The material continues to move down until it is fully exposed to the punch mold. Then the vacuum, the edge and all around are reduced and formed.
The convex mould vacuum forming is mainly used for the thin-walled plastic parts with convex shape, and the inner surface dimensions of the forming parts are high.
3. The concave and convex mold has been vacuum-shaped successively.
First, the plastic plate clamping is fixed on the die to heat; When the plate is softened, remove the heater and blow into the compressed air through the punch mold.
And the concave die vacuum makes the plastic sheet bulge; The final punch is inserted into the bulging plastic sheet and a vacuum is drawn from it, while the die is concave.
Through the compressed air, the plastic sheet is attached to the outer surface of the punch mold.
This kind of forming method, because the plastic sheet that will soften is blown, make sheet material extends after forming, so wall thickness is more even, usable.
Plastic parts in moulded deep cavity.
4. Bubble vacuum forming.
Some require the wall thickness to be roughly uniform, and also can be blown bubble vacuum molding. Use the convex molding in the closed box. First of all,
The plastic sheet is fastened to the mould frame and heated by the heater. When the plastic is heated and softened, remove the heater and close it.
In the box, the compressed air is blown in, and the plastic sheet (sheet) is blown up to raise the punch mold, forming an airtight state between the plate and the plate. Stop blowing
The air is drawn from the air hole on the punch mold, and the plastic sheet is attached to the punch mold.
This kind of forming method USES air to blow up sheet material, make its each part reduce thin at the same time, the aviation plastic cup that is formed is basically consistent.
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