How much does wall thickness of plastic parts affect quality?

【Summary】:

The wall thickness of plastic parts processing has a great impact on quality. If the wall thickness is too small, the flow resistance is large, and it is difficult for large and complex plastic parts to fill the cavity. The minimum wall thickness of plastic parts processing should meet the following requirements: 1 It has sufficient strength and rigidity; 2.It can withstand the impact and vibration of the demolding mechanism when demoulding; 3.It can withstand the fastening force when assembling. The minimum thickness of plastic wall is required by the injection molding factory. The size of the product is different. Excessive wall thickness in the processing of plastic parts not only wastes raw materials, but also increases the molding time for thermoset plastic molding and is easy to manufacture.

The wall thickness of plastic parts processing has a great impact on quality. If the wall thickness is too small, the flow resistance is large, and large and complex plastic parts are difficult to fill the cavity. The minimum wall thickness of plastic parts processing should meet the following requirements:

1.Have sufficient strength and stiffness;

2.Can withstand the impact and vibration of the demoulding mechanism when demoulding;

3.It can bear the fastening force during assembly.

The minimum thickness of the wall is stipulated in the injection molding factory, which varies according to the variety, brand and size of the plastic parts. Excessive wall thickness in the processing of plastic parts not only wastes raw materials, but also increases the molding pressure for the thermosetting plastic molding process. Time, and it is easy to cause incomplete curing; for thermoplastics, it increases the cooling time. It also affects the quality of plastic parts processing, and the wall thickness of the same injection molded part should be as uniform as possible, otherwise it will be caused by cooling and Uneven curing speed creates additional stress.

It is important to properly determine the wall thickness of the plastic part. The wall thickness of plastic parts first depends on the use requirements of the plastic parts: including the strength, quality cost, electrical performance, dimensional stability, and assembly requirements of the parts. Generally, the wall thickness has empirical values, which can be determined by referring to similar (such as The thickness of the iron is generally 2mm, and the vacuum cleaner is generally 2.5mm. The points to note are as follows:

a. The wall thickness of the plastic parts should be as uniform as possible to avoid too thin, too thick and abrupt changes in wall thickness. If the plastic parts require wall thickness changes, a gradual or circular transition should be used, otherwise the plastic parts will be deformed due to uneven shrinkage. 2. Affecting molding process problems such as affecting the strength of plastic parts and affecting the fluidity during injection molding.

b. The wall thickness of plastic parts is generally in the range of 1-5mm. The most commonly used value is 2-3mm.

c. The minimum wall thickness of common plastic parts and recommended value of common wall thickness: (mm)

d. Try not to design the ribs and screw columns too thick. Generally, it is recommended to take half of the body wall thickness, otherwise it is easy to cause appearance problems such as microcosms.

e. Try not to design the part as a separate flat plate, the size is very small, otherwise the deformation will cause the part to be uneven.