Injection mold design: exhaust system
author: Universe Plastic
2024-07-04
The exhaust system of the injection mold is very important in the injection molding process. It can prevent air and gas from accumulating in the mold cavity and ensure smooth flow of plastic melt in the mold cavity during injection, thereby improving product quality.
Regarding the design and manufacturing of injection mold exhaust systems, Universe Plastics Engineers shared the following key knowledge points:
Exhaust system type design
1. Exhaust slot The exhaust slot is generally designed at the last location where the melt reaches or where air easily accumulates. The width and depth of the exhaust groove should be moderate, with the width usually between 3-5 mm and the depth between 0.02-0.04 mm.
2. Vent The exhaust hole is usually designed at the highest point of the cavity or the position where the material finally flows, and the diameter is generally between 0.3-0.8 mm.
3. Vacuum exhaust system It is connected to the mold cavity through a vacuum pump, and the air in the mold cavity is extracted before injection molding to ensure that no gas remains.
4. Micro exhaust technology Through tiny exhaust holes and high-precision processing technology, more efficient exhaust is achieved.
Exhaust system manufacturing
1. Design stage According to the product design and mold structure, the appropriate exhaust method, location, size, etc. are selected according to the exhaust volume and exhaust area. Computer injection molding simulation can be used to optimize the design of the exhaust system to ensure that the gas can be discharged smoothly.
2. Processing stage It is recommended to use CNC machine tools for precision machining of exhaust grooves. For complex exhaust grooves and exhaust holes, electrical discharge machining technology can be used to achieve high-precision machining. It is recommended to use laser processing to make tiny exhaust holes to ensure the efficiency of the exhaust system.
3. Fine processing Polish the exhaust grooves and exhaust holes to reduce surface roughness and ensure smooth exhaust. For tiny vent holes, high-precision tools are used for micro-machining to ensure accuracy in size and position.
4.Quality control Use high-precision inspection equipment such as a three-dimensional coordinate measuring machine (CMM) to inspect the exhaust system of the mold to ensure the accuracy of size and position.
5. Post-assembly testing Before the mold is officially produced, an exhaust test must be performed to check the exhaust effect and ensure that there are no pores blocked.
Exhaust system maintenance
1. Clean the vent grooves and vent holes regularly. They are easily blocked by melt residue during injection molding production.
2. The exhaust grooves and exhaust holes may become worn after long-term use and require regular inspection and repair.
Advantages of Injection Molding for Exhaust Systems
1. The exhaust system can discharge the gas in the mold cavity in time to avoid the formation of injection bubbles and reduce plastic burns.
2. The exhaust system can make the product surface smooth and defect-free, improving the quality of injection molded products.
3. The exhaust system can reduce injection pressure, reduce machine load, and improve production efficiency.
Summarize
By learning the above injection mold exhaust system types and manufacturing processes, injection molding production efficiency and product quality can be effectively improved, and the defective product rate and production costs can be reduced. Dongguan
Dongguan Universe Plastic Factory has more than 15 years of experience in manufacturing injection molds and has rich experience in the design and manufacturing of mold exhaust systems. If you have injection mold manufacturing needs or questions, please feel free to contact us at any time.
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