How does the design of plastic pipe mold affect the dimensional accuracy and appearance quality of pipes?
Publish Time: 2024-08-10
The design of plastic pipe mold determines the dimensional accuracy and appearance quality of pipes to a large extent.
First of all, the cavity size design of the mold is directly related to the dimensional accuracy of the pipe. If the cavity size is inaccurate, the diameter, wall thickness and other dimensions of the produced pipe will be deviated. For example, if the cavity diameter is designed to be too large, the outer diameter of the pipe will be too large, which may cause the pipe to be unable to match the corresponding pipe fittings. When designing, the cavity size should be accurately calculated and processed according to the standard size requirements of the pipe, and the shrinkage rate of the plastic material during the molding process should be taken into account. Reasonable compensation measures should be taken to ensure the accuracy of the final pipe size.
The runner design of the mold also has an important influence on the dimensional accuracy of the pipe. A good runner design can ensure that the plastic melt flows evenly in the mold and avoid the situation where the local flow rate is too fast or too slow. If the runner design is unreasonable, it may cause uneven wall thickness of the pipe. For example, the cross-sectional shape and size of the runner should be optimized according to the characteristics of the plastic and the specifications of the pipe, so that the melt can smoothly fill the cavity, thereby ensuring the consistent wall thickness of each part of the pipe.
For the appearance quality, the surface finish of the mold plays a key role. The rough surface of the mold will cause scratches, pitting and other defects on the surface of the pipe. The high-quality mold surface is finely processed and polished, which can make the surface of the produced pipe smooth and bright. In addition, the exhaust design of the mold is also very important. If the gas in the mold cannot be discharged in time, pores, bubbles and other defects will be formed on the surface of the pipe. Reasonable setting of exhaust grooves and exhaust holes can effectively remove gas and improve the appearance quality of the pipe. In addition, the cooling system design of the mold will also affect the appearance quality. Uniform cooling can prevent the pipe from deformation, warping and other problems due to uneven cooling, and ensure the regular shape and good appearance of the pipe. In short, through scientific and reasonable mold design, optimization from multiple aspects such as cavity size, runner, surface finish, exhaust and cooling can significantly improve the dimensional accuracy and appearance quality of plastic pipes.
