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news
2021.12.9
With the continuous development of die-casting technology towards digital and intelligent direction, die-casting machine has made great progress in this direction, and die-casting mold is obviously backward in intelligent and digital control, especially in the application of intelligent control of die heat balance. High pressure water cooling control technology can realize the improvement of heat balance and local pore defects of zinc alloy die casting mold.
Die casting industry has become one of the important industries in China, which is inseparable from the transfer of foreign die casting industry. At the same time, foreign zinc alloy die castings have more stringent requirements on die casting technology and more stringent quantitative quality requirements for zinc alloy die castings, so we must be in die casting equipment, mold design, mold temperature intelligent control, etc, meet the technical requirements of die castings.
In the production of zinc alloy die casting, the control of die casting mold surface temperature directly affects the product porosity and local porosity defects. A set of high-pressure water cooling control system with scientific design and obvious and controllable cooling effect is very important.
At present, the surface temperature of die-casting mold is mainly controlled by introducing heat exchange media such as oil or water into the cooling channel of die-casting mold. The traditional method of domestic zinc alloy die casting plants is to continuously connect the cooling water with the pressure of 0.2-0.3mpa into the mold cooling channel, and the opening, closing and flow of cooling water are controlled by manual valve. Its disadvantage is that the control of die surface temperature depends on the experience of operators and repeated adjustment, which is difficult to operate. The surface temperature of local areas is difficult to control, resulting in serious shrinkage and porosity defects of die castings, low qualification rate of zinc alloy die castings and low production efficiency.
The simple description of high-pressure water cooling control technology is to achieve intelligent control of mold heat balance through digital management of mold cooling water. Its core is high-pressure cooling water control technology and mold temperature zoning control. Through practical application, this technology can effectively control the surface temperature of die-casting part, so as to reduce the porosity and local porosity defects of zinc alloy die-casting parts and improve the qualified rate of products.
Pressurize the cooling water of the mold to 0.6-1.2mpa. While the mold is filled with alloy material, quickly pass it into the mold cooling water channel to cool the mold. When the cooling time is up, stop the water supply, blow compressed air into the cooling channel and remove the residual cooling water in the cooling channel.
The high-pressure point cooler provides up to 6 groups separately controllable water supply and blowing circuits; The mold temperature control can be divided into different areas. Each area can independently control the opening time and water supply time of cooling water and cleaning gas, so as to control the temperature of different areas of the mold and realize the heat balance of the overall mold temperature.
– High pressure point cooler is mainly used for high-pressure point cooling of die core pin. It is generally used for point cooling pipe with diameter of 0.85-2.5mm, and the pressure of cooling water is about 1MPa; through high-pressure and high-speed cooling water heat exchange, the temperature of local points of die can be quickly controlled to eliminate casting heat shrinkage or heat crack defects caused by local overheating of die.
– The high-pressure point cooler is used in combination with the header and distribution box for single point controllable and return water monitoring super point cooling. It can also be used alone for single channel controllable
– The high-pressure die cooler is mainly used for cooling the die core, insert and core pulling slider. It is generally used for the spot cooling pipe with a diameter of more than 3mm or the main cooling channel of the die. The pressure of cooling water is about 0.6MPa
– High pressure point cooler and high pressure die cooler are generally used together to control different parts of the die respectively, so as to more accurately realize the heat balance of the die.
Main functions of high pressure point cooler:
– Automatic control of water storage level, low water outlet level and high temperature alarm.
– Pipeline overpressure safety control and alarm
– Backwater monitoring and alarm
– PLC control and color touch screen operation
– Chinese and English operation interface, graphical real-time display
– 20 sets of mold menu storage and recall.
– Fault diagnosis and alarm history.