Today, Xiaobian brought you the key points of mold design. Let's have a look!



1、 Design points of die cooling system



1. The distance between the cooling water channel and the forming surface shall be equal, and its arrangement method shall be consistent with the shape of the forming surface.



2. The function of the cooling water channel is to cool the surface of the formed parts, keep the temperature of the mold uniform, and avoid the deformation of the product.




3. In general, the distance between the cooling water hole and the cavity needs to be kept at about 15-25mm. If the distance is too close, it will easily lead to uneven cooling temperature, and if the distance is too far, it will easily lead to low cooling efficiency.



4. When the diameter of the cooling water hole is designed to be 8-12mm, the cooling effect can be guaranteed.



5. If the mold adopts the circulating cooling method, the cooling process in the water channel shall be equal. The cooling water channel shall first pass through the gate and then flow in the direction of material flow, that is, from the area with high mold temperature to the area with low mold temperature.



6. In the design process of cooling water channel, the possibility of welding mark of plastic parts should be avoided as far as possible.



7. The sealing of cooling water channel shall be considered, waterproof measures shall be taken, and sealing rings shall be installed to reduce water leakage.




8. In order to avoid the interference between the cooling water nozzle and the guide column of the injection molding machine, it should be set on the left and right sides of the mold.



9. A separate cooling system can be set for the moving and fixed mold, which is conducive to regulating and controlling the production of plastic parts and avoiding deformation defects.




The cooling of the cavity of the plastic injection mold is completed by the cooling water channel on the fixed template. The injection mold core is internally provided with a cooling water hole, which is separated by a water baffle. The cooling water enters from the cooling water hole on the support plate, rises to the upper part of the core along one side of the water baffle, turns over the water baffle, flows into the other side, and then flows back to the cooling water hole on the support plate. Then continue to cool the second core, and finally flow out of the injection mold through the cooling water hole on the support plate.





The design of plastic injection mold cooling system directly affects the production efficiency of injection mold and the quality of plastic parts. The cooling effect of the cooling system determines the cooling time, and the cooling time of injection mold accounts for about 2 / 3 of the whole injection cycle. A perfect cooling system can significantly reduce the cooling time, so as to improve the production efficiency of injection mold.



The deformation and internal residual thermal stress of plastic parts are often caused by uneven cooling. Using CAE technology for analysis, we can obtain economic cooling time, reasonable injection mold cooling pipe size and layout, and make the plastic parts cool evenly as much as possible.



The purpose of designing cooling system for plastic injection mold is to maintain proper and efficient cooling of the mold. The cooling duct shall be of standard size to facilitate processing and assembly. When designing the cooling system, the mold designer must determine the following design parameters according to the meat thickness and volume of the plastic part: the position and size of the cooling channel, the length of the channel, the type of channel, the configuration and connection of the channel, as well as the flow rate and heat transfer properties of the coolant.



The above is the analysis of why the cooling system design of plastic injection mold is very important introduced by SINSA mold. I hope it can provide you with reference.



Suzhou SINSA mold manufacturing, focusing on two-color molds for 10 years, is engaged in the R & D, design and manufacturing of precision plastic molds, and is committed to providing customers with one-stop services from product design, mold manufacturing, molding production to assembly