Leakage of cooling water from injection molds is a common occurrence. There are many reasons. There are mainly the following aspects:
1 The most occurred in the joints of the mold cooling water pipe. If any water leakage is found, a 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 inside the mold will be damaged, and the O-shaped waterproof rubber ring will be hardened and cracked, leading to water leakage. Some waterproof rings will also cause seal failure due to poor installation. Generally, it is necessary to regularly check the installation of the seal ring. Position and sealing performance.
3 The wall of the cooling water hole is damaged. This happens frequently when trying new molds. The wall thickness is sufficient for design, but the hole wall is worn out due to machining error or post-processing. In most cases, the water hole is leaking. Can not be used again.
4Cooling water hole inspection and maintenance. Cooling water hole is easy to generate scale, hinder heat transfer, in case of serious water route, need regular maintenance. For straight water hole, you can insert a 0.5mm smaller diameter than the cooling water hole, with Hammer strike to remove scale and rust. For cooling water pipes embedded in the mold, the mold should be disassembled to remove rust.
After the maintenance, a leakage test shall be carried out. A hand pump shall be used to fill the water hole, and the pressure shall be maintained for 5 minutes under a pressure of 2 MPa. It shall be judged whether the water hole is leaking by observing whether the water pressure is reduced. The leakage part may use rubber, cork and other elastic materials to mechanically The method of fastening is blocked, and normal temperature curing silicone can also be used as a plugging material.
5 Periodically overhaul the heating pipe, the decompression pump and the use. The heating pipe is an effective heat transfer element, and it is very effective for core cooling of deep structure. In the part where the cooling water is easy to pass, one-way heating pipe can be installed to reduce water leakage. , The use of vacuum pump cooling water, but also to prevent cooling water leakage.