Bian Xiao made an inquiry through the architectural knowledge column of the construction industry encyclopedia website Construction Network, and sorted out the basic information about the demoulding inclination of plastic molds. The basic contents are as follows:
Inclination angle of demoulding: In order to facilitate demoulding, the wall surface of plastic products should have an inclination angle α in the demoulding direction, and its value is expressed in degrees.
Key points of determining demoulding slope
(1) The higher the product precision requirement, the smaller the demoulding slope should be.
(2) For larger products, smaller demoulding inclination should be adopted.
(3) If the product shape is complex and demoulding is difficult, a larger slope should be selected.
(4) The shrinkage rate of the product is large, and the inclination should also be increased.
(5) Reinforced plastics should have a large inclination, and plastics containing self-lubricating agents can have a small inclination.
(6) The product has a large wall thickness and a large slope.
(7) the direction of the slope. The inner hole shall be subject to the small end, meet the requirements of pattern size, and obtain the slope in the development direction; The shape is subject to the big end, which meets the requirements of the pattern and obtains the slope in a smaller direction. Generally speaking, the demoulding slope. Not limited by the product tolerance zone, the demoulding slope of high-precision plastic products should be within the tolerance zone.
Related contents of demoulding inclination of plastic mould:
The demoulding inclination of plastic parts is related to the performance, shrinkage, friction coefficient, wall thickness and geometry of plastic parts. Hard plastic has a larger demoulding slope than soft plastic; Plastic parts with complex shapes or many molding holes have a large demoulding inclination; If the height of plastic parts is large, the hole is deep and the demoulding slope is small; With the increase of wall thickness, the force of inner hole wrapping the core is large, and the demoulding slope is also larger. Sometimes, in order to keep the plastic parts in the concave mold or core, the slope of the side surface will be intentionally reduced or the hypotenuse will be increased.
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