Injection mold cooling water leakage failure and troubleshooting methods

Injection mold cooling water leakage is often occurring for many reasons, mainly in the following areas.

1. the most occurring at the joints of the cooling water pipes of the mold, if the leakage is found, the sealing tape should be wrapped around the threads of the pipe joints and then tightened.

2. Due to the long-term molding conditions, the waterproof ring inside the mold will be broken, in the O-shaped waterproof rubber ring is easy to harden and crack, resulting in water leakage. Some poor installation of the waterproof ring can also cause seal failure. Generally need to regularly check the installation position and sealing performance of the seal ring.



3. The whole wall of the cooling water hole is broken. This often happens when trying out a new mold, where the designed wall thickness is adequate, but the whole wall is worn through due to processing errors or post-processing. In most cases, the leaking water hole can not be used again.

4. Cooling water hole maintenance. The cooling water hole is easy to scale, obstructing the heat transfer, serious when the water circuit does not work, the need for regular maintenance. For straight water holes, insert a steel rod with a diameter of 0.5mm smaller than that of the cooling water hole, and hit it with a hammer to remove scale and rust. For the cooling water pipe buried in the mold, the mold should be decomposed to remove the rust.

After inspection and repair should be carried out a leak test, using the hand pump to fill the water hole, keep 5min under 2MPa pressure, and judge whether the water hole is leaking by observing whether the water pressure is reduced. Leakage can be used rubber, cork, and other elastic materials to mechanical fastening method of blocking, but also can try room temperature curing type silica gel as a sealing material.

5. Regular maintenance of the heating pipe and decompression pump with the use of. The heating tube is an effective heat transfer element and is very effective in cooling the core of the fine and deep structure. In the part where cooling water can easily pass, setting a one-way heating pipe can reduce leakage. In addition, the use of a reduced pressure pump to suck cooling water is also a way to prevent cooling water leakage.