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Enterprise name: Zongsheng Precision Mould Co., Ltd. 

Contact: Mr. Nie 13923298099 (Wechat same number). 

Miss Jia 15820657628 (Wechat same number). 

Tel: 0757 2226 9630. 

0757 color 22269276. 

Email: 261909968@qq.com. 

QQ:261909968. 

Fax: 0757 2226 9631 22269276. 

Web site: en.fszongsheng.com. 

Add: no. 1, Rongye 6 road, Fengxiang industrial zone, Daliang, Shunde district, Foshan city, Guangdong province


What is the significance of improving the quality of the machined surface of professional PET injection moulds

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What is the significance of improving the quality of the machined surface of professional PET injection moulds

Release date:2019-05-14 Author: Click:

The surface features of the products produced by plastic bottle cap mold are imitated by the surface of the mold. 

Therefore, the surface roughness of the plastic bottle cap mold is directly reflected in the surface roughness of the products. 

The smaller the surface roughness value of the custom mold is, the smaller the surface roughness value of the product is. 

Therefore, the quality of the machined surface has an impact on the function of the plastic bottle cap mold, as follows. 

The main results are as follows: (1) the influence of mold surface roughness on the demoulding of products. 

When the plastic bottle cap mold is manufactured, in order to facilitate the demoulding of the product, the demoulding angle is often created when machining the working surface of the mold. 


The smaller the mold surface roughness value is, the simpler the product demoulding is, the smaller the demoulding slope is; the larger the mold surface roughness value is, the more difficult the product demoulding is, and the greater the demoulding angle is. 

When the demoulding angle of the mold is small, the surface roughness of the mold should be small enough, and the direction of polishing lines should be common with the demoulding direction, otherwise the surface of the product will be simply pulled, resulting in severe failure of demoulding and damage to the product and core. this problem is particularly prominent in the manufacture of metal die-casting moulds.

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(2) the influence of the surface quality of the die parts on the fatigue strength of the parts. 

Under the action of alternating load, the uneven grooves on the surface and the defects of the surface layer briefly cause stress convergence and fatigue cracks, resulting in fatigue damage of the parts. 

The work hardening of the plastic bottle cap mold surface layer can improve the wear resistance of the plastic bottle cap mold surface and prevent the appearance of fatigue cracks on the surface layer. 

However, if the degree of cold hardness of the surface layer of the part is too large, it is easy to crack, so the degree of cold hardness and hardening depth of the part should be controlled within a certain range. 

The residual stress of the surface layer also has a great influence on the fatigue strength of the parts. 

When there is residual compressive stress in the surface layer of professional PET injection mold, it can postpone the propagation of fatigue crack and advance the fatigue strength of the part; when there is residual tensile stress in the surface layer, it can simply cause cracks on the surface of the part and reduce its fatigue strength.

专业PET注塑模具

  

(3) the influence of the surface roughness of the die parts on the corrosion resistance function of the parts. 

The corrosion resistance of the parts depends to a large extent on the surface roughness of the parts. 

The rougher the surface of the part is, the easier it is to accumulate corrosive materials, and the deeper the depression is, the stronger the penetration and corrosion will be. 

Therefore, reducing the surface roughness of the parts can improve the corrosion resistance function of the parts. 


(4) the influence of the surface roughness of die parts on the cooperative properties. 

For the cooperative parts with relative motion requirements, the standard of the parts will be changed due to wear, which will affect the cooperative properties of the parts. 

If the surface roughness of the part is not selected properly, the wear speed of the part will be accelerated, the reasonable space obtained by the device will be sensitively increased, and a new set of plastic bottle cap mold will soon lose its normal working ability. 


Therefore, when it is required to cooperate with moulds with very small open space, we should not only ensure the standard and accuracy of the cooperation surface, but also ensure a certain surface roughness. 

In the same interference cooperation, if the surface of the part is rough, the convex peak of the cooperation surface after the device is flattened, the useful interference between the cooperation parts is reduced, the connection strength between the cooperation parts is reduced, and the reliability of the cooperation is affected. 

Therefore, for surfaces with cooperation requirements, it is necessary to regulate smaller surface roughness. 

In short, the quality of the mold processing surface is very important for the use of the plastic bottle cap mold and the life of the plastic bottle cap mold.


URL of this article:http://en.fszongsheng.com/news/393.html

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Foshan Shunde Zongsheng Precision Mould Co., Ltd. 

Tel: 0757 Tel: 22269630 / 13923298099 (Mr. Nie). 

Web site: www.fszongsheng.com. 

Add: no. 1, Rongye 6 road, Fengxiang industrial zone, Daliang, Shunde district, Foshan, Guangdong


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