What are the points to pay attention to in the design and manufacture of SMC molds


The main points of SMC mold design and manufacturing co […]

The main points of SMC mold design and manufacturing cover SMC mold product classification, processing accuracy, demoulding, cutting edge, fillet, heating method, mold material, surface treatment and other common problems, etc. Some small details of SMC mold design are for everyone That is very important.
1. SMC mold ejector plate thickness
The thickness of the ejector plate should be determined according to the size, shape and weight of the mold, and its thickness is generally not less than 30mm, otherwise problems such as ejector plate deformation are prone to occur.

2. SMC mold heating hole distribution
SMC mold heating hole distribution requirements are that the heating hole should not be too close to the cavity, nor too far away, it is best to keep 40~80mm; the distribution of heating holes should be thin in the middle and dense at both ends; if the SMC mold uses electric heating, the heating holes That is, the number of electric heating tubes is preferably a multiple of 3 to facilitate the connection of electricity, and the electric heating tubes at both ends must be a certain distance beyond the edge of the cavity; d) The distribution of heating holes should follow the shape of the mold.
3. SMC mold side drawing mechanism
When the side of the product has holes or convex and concave sides, a side-molded core must be used to meet the requirements of the product. The side core must be drawn out before the product is demolded. SMC mold should avoid side core pulling mechanism as far as possible. If side core pulling cannot be avoided, make core pulling as short as possible.

4. SMC mold ejection method
The selection of the SMC mold ejection system is mainly to separate the product from the mold when the press is turned on after the product is formed, so as to facilitate the removal of the product. The ejector rod is located in the SMC mold and is driven by some mechanical (or hydraulic) means. These systems include hydraulic systems and mechanical action systems. There are two types of commonly used hydraulic systems, one is the hydraulic system inside the press, and the other is the hydraulic system that is separately connected to the ejector plate on the mold. Among them, when the oil cylinder is installed on the mold ejector plate, the ejection imbalance will often occur. The solution is to connect a gear oil separator. The above two systems are very suitable and have good effects. Each production unit can choose a suitable ejection method according to its actual situation.