Venting of parting surface
The exhaust slot on the parting surface is easy to clean and processing, also not easy to be blocked, and has a good exhaust effect, it is the main area where the gas is exhausted, so the exhaust from the parting surface is very popular by injection mold factory and injection molding plant. If the parting surface is curved or inclined, CNC machining, electrode processing or wire cutting is generally used, the roughness of the parting surface after processing is relatively high, Ra is generally 1.6~6.3μm, and the exhaust slot is generally processed directly by CNC. If the parting surface is flat, it is usually processed by a grinding. The roughness of the parting surface after the grinding machine is low, Ra is 0.2~0.8 μm, the parting surface is tightly fitted, and the gas in the cavity is not easy to discharge. In this case, an exhaust slot must be opened on the parting surface on one side of the cavity. There are two ways to open the exhaust slot on the parting surface: one is to open the exhaust slot locally, and the other is to open the exhaust slot around the part.

1.Parting surface with partial exhaust slot: this is the most commonly used method of exhaust, the method is to open the exhaust slot where the air is trapped. The position of the exhaust slot is generally combined with the mold flow analysis report based on experience. Determine its final trapped position. This type of venting has less damage to the parting surface of the mold, and it is more flexible and convenient to change the back mold, the specific form is shown in picture 2.
2. Exhaust slot are opened around the parting surface: when the air trap is particularly serious, a large area of exhaust slot can be used to exhaust, as shown in picture 2. If the parting surface of this kind of exhaust slot is flat, it is usually processed with a flat-bottom milling cutter. If the parting surface is curved, it is usually processed with an R-shaped ball cutter, this type of exhaust slot is divided into a first-level exhaust slot, a second-level exhaust slot and a third-level exhaust slot, the depth of which is different.


Side gate of plastic injection mold runner system design
Jan 23, 2022In order to get the best injection quality, the gate type must be selected carefully, the coommon gate tyeps are: direct gate, side gate, pin-point gate, sub gate,valve gate of hot runner etc. Among...view
Unique Solutions Mold Profile
Dec 27, 2021USM (UNIQUE SOLUTIONS MOLD LIMITED) was founded in 2012 and is located in Dongguan City, Guangdong Province, a famous mold manufacturing province in China, the plant covers an area of 3500 square...view
Water assisted injection molding introduction
May 11, 2022Like the gas-assisted injection molding process, water-assisted injection molding injects a piece of plastic into the mold cavity and core firstly, and then injects water to squeeze the melt plastic...view
Well-ventilated steel of venting design for molded parts
Mar 14, 2022Well-ventilated steel is a sintered alloy, iIt is a porous material sintered with spherical particle alloys, the pore size is 7-10μm and the strength is poor, but the texture is loose which allow the...view
Classification of side parting and core pulling mechanism
Jul 17, 2022According to the structural characteristics of plastic moulding, the side core-pulling mechanisms are divided into the following six categories: 1. The side core-pulling mechanism of "slider + guide...view
Plastic molding shrinkage rate
Dec 30, 2021Plastic parts getting smaller by shrink, due to the temperature decrease during the molding process, and the shrinkage is expressed by the shrinkage rate, it is common plastic shrinkage rates are...view
English
русский



