Leakage of cooling water from injection molds is a frequent occurrence for many reasons, mainly in the following areas:
1 The most occurred in the joints of the mold cooling water pipe. If water leakage is found, the sealing tape should be wound on the thread of the pipe joint and then tightened.
2 Because of the long-term molding conditions, the waterproof ring in the mold will be damaged, and the O-shaped waterproof rubber ring will be hardened and cracked, resulting in water leakage. Some poor installation of waterproof ring can also cause seal failure. It is generally necessary to regularly check the sealing ring installation position and sealing performance.
3 The wall of the cooling water hole is broken. This often happens when a new trial mold design thickness is sufficient, but due to post-processing or machining error caused by rupturing the cell walls. In most cases, leaking water holes can no longer be used.
4 cooling water hole overhaul. In the cooling water hole, it is easy to get scale, hinder heat transfer, and in case of serious water route, it needs regular maintenance. For straight water holes, insert a steel rod 0.5mm smaller than the diameter of the cooling water hole and strike with a hammer to remove scale and rust. For the cooling water pipe embedded in the mold, the mold should be disassembled to remove rust.
After the leak test should be carried out inspection using the hand pump water to the water-filled pores, a 5min at 2MPa pressure, water pressure is reduced by observation to determine whether the water leakage hole. Leaks can be mechanically fastened clogging may try room temperature curable silicone rubber as a sealing material, elastic material such as cork.
5 Regularly overhaul the heating pipe and the decompression pump and use. The heating tube is an effective heat transfer element, and it is very effective for the core cooling of the deep structure. In locations where cooling water can easily pass through, one-way heating pipes can be installed to reduce water leakage. In addition, the use of vacuum pump cooling water, but also to prevent cooling water leakage method.