1. Most of them occur at the joint of the mold cooling water pipe, if water leakage is found, the sealing tape should be wrapped on the thread of the pipe joint, and then tightened.
2. Due to long-term molding conditions, the waterproof ring in the mold will be damaged, and the O-shaped waterproof rubber ring is easy to harden and crack, resulting in water leakage. Some waterproof rings are poorly installed and can also cause sealing failure. Generally, the installation position and sealing performance of the sealing ring should be checked regularly.
3. The hole wall of the cooling water hole is damaged. This often happens when trying out new molds, where the wall thickness of the design is adequate, but the hole wall is punctured due to machining errors or post-machining. In most cases, leaky holes can no longer be used.
4. Regularly overhaul the heating pipe and pressure reducing pump and utilization. The heating tube is the heat transfer element. In areas where cooling water is easy to pass, a one-way heating tube can be installed to reduce water leakage. In addition, the use of a pressure reducing pump to suck cooling water is also a method to prevent cooling water leakage.
5. Overhaul of cooling water holes. It is easy to scale in the cooling water hole, hinder heat transfer, and in severe cases, the waterway is impassable and needs regular maintenance. For straight water holes, a steel rod 0.5mm smaller than the diameter of the cooling water hole can be inserted and struck with a hammer to remove scale and rust. For the cooling water pipe buried in the mold, the mold should be disassembled to remove the rust.
After maintenance, a water leakage test should be carried out, and a hand pressure pump should be used to fill the water hole with water, and it should be maintained at 2MPa pressure for 5min, and whether the water hole is leaking by observing whether the water pressure is reduced. Water leaks can be blocked by mechanical tightening of elastic materials such as rubber and cork, and room temperature curing silicone can also be used as a plugging material.
