{"id":203,"date":"2025-01-07T15:28:17","date_gmt":"2025-01-07T07:28:17","guid":{"rendered":"http:\/\/www.1.com\/?p=201"},"modified":"2025-02-03T11:21:50","modified_gmt":"2025-02-03T03:21:50","slug":"about-detail-1","status":"publish","type":"post","link":"https:\/\/www.hexinmusu.com\/en\/about-detail-1.html","title":{"rendered":"Low Pressure Die Casting Principles and Applications"},"content":{"rendered":"

What is low pressure die casting?<\/h2>\n\n\n\n

Aluminum low pressure die casting (LPDC) is to make liquid metal under pressure to complete the filling cavity and solidification process two get casting a casting method. Due to the existence of a certain pressure but far lower than the pressure of high-pressure die casting pressure (the highest pressure is only for high-pressure die casting 1%), low-pressure die casting pressure range in (20 ~ 60kPa), with its role in the pressure of small slow, but also be able to manufacture a more complex internal hollow products (the hollow part of the need for the sand core subsequent to the removal of the so-called low-pressure sand casting), and the principle of its role is closer to the aluminum Casting, so it is also called aluminum low-pressure casting.<\/p>\n\n\n\n

Low pressure die casting process<\/strong>In the impermeable crucible, through the pipe into the compressed dry gas, molten aluminum liquid under the action of gas pressure, along the rising liquid pipe (crucible pipe) through the mold gate smoothly into the cavity, keep the gas pressure on the liquid surface in the crucible, maintain a certain period of time pressure, such as low-pressure mold cavity solidification of the product, and then lifting the crucible on the liquid surface of the gas pressure, so that the rising liquid pipe in the un-solidified metal Then the gas pressure on the liquid surface in the crucible is lifted, so that the unsolidified metal in the liquid ascending tube flows back to the crucible, and the low-pressure aluminum casting is taken out by opening the mold through the low-pressure casting machine. As the casting direction of low pressure casting is inverse gravity casting, it is also called anti-gravity low pressure casting.<\/p>\n\n\n\n

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History of Low Pressure Casting<\/h2>\n\n\n\n

At the beginning of the twentieth century, there have been countries have begun to study the low-pressure casting process, the British E.H. Lake is the first registered on the aluminum alloy low-pressure casting patents of the company, the French first in the aluminum alloy casting production in the promotion and use.<\/p>\n\n\n\n

After the outbreak of the Second World War, aviation military industry and other manufacturing industries have further development, should be widely used in the low-pressure casting process for high-demand aircraft engine system aluminum alloy parts, mass production of aluminum alloy castings, North America the use of low-pressure aluminum alloy casting technology is widely used in automotive parts, motor shell and other castings manufacturing. In this way, the low pressure casting process quickly spread to the field of general machinery, textile machinery, instruments and commercial products.<\/p>\n\n\n\n

China began to study low-pressure casting from the 1950s, but the development has been relatively slow. With the development of the automobile industry, and the adoption of a large number of new technologies, at the end of the last century and the beginning of this century, low-pressure casting in China has been the rapid development of domestic low-pressure casting machine function and performance, and the use of the stability and reliability of the machine has been close to or reached the international advanced level, is used in a large number of automobile wheel hubs, automobile cylinder heads and other castings production.<\/p>\n\n\n\n

Low pressure die casting mold material selection<\/h2>\n\n\n\n

Low pressure die casting mold is also known as low pressure permanent mold, the use of metal cavity manufacturing molds, can be used to turn the sand mold (ductile iron), mold steel mold (p20, #45, H13 and other heat-resistant mold steel), production. Different molds have different mold life, ordinary sand mold life is about 2000-5000 mold, modulation of #45 life can be done 5000-10000 + mold, ordinary have done a vacuum heat treatment of h13 can reach 30000 mold life. The better ones can even reach 50,000 molds or even 100,000 molds.<\/p>\n\n\n\n

Advantages and disadvantages of low pressure die casting<\/h2>\n\n\n\n

Advantages of low-pressure casting<\/strong><\/p>\n\n\n\n