Plastic molds may fail in many ways during use, which will affect the performance and life of the molds.

 

What are the Failure Forms of Plastic Molds?

 

Plastic molds may fail in many ways during use, which will affect the performance and life of the molds. The failure modes mainly include wear failure, fatigue failure, corrosion failure, thermal fatigue failure, adhesion failure, and deformation failure.

 

 

The following are six common types of plastic mold failure modes:

(1) Wear failure: Wear is one of the common forms of mold failure. During the contact and friction between the mold and the plastic material, the mold surface will be worn. Long-term wear will cause the mold size to change and the surface roughness to increase, thus affecting the quality and precision of the product.

 

(2) Fatigue failure: Fatigue failure is caused by crack propagation and fracture of the mold under long-term cyclic loading. Plastic molds undergo repeated stress loading during use. If the fatigue limit of the material is exceeded, fatigue failure will occur. Fatigue failure is usually manifested as cracks, fractures or deformation.

 

(3) Corrosion failure: Corrosion refers to the failure caused by the erosion of the mold surface by chemical substances. Plastic molds may come into contact with some chemical substances, such as acids and alkalis, which will cause corrosion on the mold surface. Corrosion can make the mold surface rough and even produce holes, affecting the service life of the mold and product quality.

 

(4) Thermal fatigue failure: Thermal fatigue is the failure of the mold caused by long-term high temperature environment. Plastic molds need to withstand high temperature cooling cycles during the injection molding process, which will cause thermal expansion and contraction of the mold material, thereby causing thermal fatigue failure. Thermal fatigue failure usually manifests as cracks, deformation or fracture.

 

(5) Adhesion failure: Adhesion refers to the adhesion of plastic materials to the mold surface during the injection molding process. As the number of injection molding increases, it will cause adhesion failure on the mold surface. Adhesion will make the mold surface rough, affecting the appearance and dimensional accuracy of the product.

 

(6) Deformation failure: Plastic molds will be subject to large injection pressure and temperature changes during the injection molding process, which may cause deformation failure of the mold. The deformation of the mold will make the product size inaccurate, the appearance poor, or even unable to be used normally.

 

The above are some common forms of plastic mold failure, each of which will have different degrees of impact on the performance and life of the mold. In order to extend the service life of plastic molds, proper maintenance measures need to be taken, and factors such as material selection, processing technology and stress analysis should be considered during the design and manufacturing process.