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The Use and Characteristics of Alloy Die Casting Process Products

The Use and Characteristics of Alloy Die Casting Process Products

Product Usage Aluminum alloy die-casting products are mainly used in electronics, automobiles, motors, household appliances, and some communication industries. Some high-performance, high-precision, and high toughness excellent aluminum alloy products are also used in industries with high requirements such as large aircraft and ships. The main use is still in the parts of some instruments. Characteristics of Die Casting 1. Wide range of die-casting 2. High dimensional accuracy of castings with low surface roughness 3. High productivity 4. High metal utilization 5. High strength and surface hardness of castings

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Precautions for die-casting forming conditions

Precautions for die-casting forming conditions

压铸机、压铸合金与压铸模具是压铸生产的三大要素，缺一不可。所谓压铸工艺就是将这三大要素有机地加以综合运用，使能稳定地有节奏地和效果好地Die casting machines, die-casting alloys, and die-casting molds are the three essential elements of die-casting production, and none of them are indispensable. The so-called die casting process is the organic and comprehensive application of these three elements, so as to produce qualified castings with good appearance, internal quality, and dimensions that meet the requirements of the drawing or agreement in a stable, rhythmic and effective manner, and even excellent castings. Material melting temperature, mold temperature during injection molding, and melt temperature; Then, the condition of the die-casting product needs to be adjusted in order to obtain a complete product. The selection principle of working temperature for die-casting molds: 1) The mold temperature is too low, the internal structure of the casting is loose, and it is difficult to discharge air, making it difficult to form; 2) The mold temperature is too high, and the internal structure of the casting is dense, but the casting is prone to "welding" and sticking to the mold cavity, making it difficult to remove the casting. At the same time, excessively high temperatures can cause the mold itself to expand, affecting the dimensional accuracy of the casting. 3) The temperature of the mold should be selected within an appropriate range. Generally, after appropriate testing, constant temperature control is preferred. The precautions for die-casting forming conditions can be simply summarized into the following two aspects: *Material melting temperature, mold temperature during injection molding, and melt temperature;生产出外观、内在质量好的、尺寸符合图样或协议规定要求的合格铸件，甚至优良铸件。

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Die casting mold requirements

Die casting mold requirements

① The entrance of the transverse sprue of a cold horizontal mold should generally be located at the upper part of the pressure chamber with an inner diameter of more than 2/3, to prevent the metal liquid in the pressure chamber from entering the transverse sprue prematurely under the action of gravity and starting to solidify earlier. ② The cross-sectional area of the transverse sprue should gradually decrease from the vertical sprue to the inner sprue. In order to increase the cross-sectional area, negative pressure will occur when the metal liquid flows through, which can easily suck in gas on the parting surface and increase the vortex entrapment in the metal liquid flow. The cross-section at the outlet is generally 10-30% smaller than that at the inlet. ③ The horizontal pouring channel should have a certain length and depth. The purpose of maintaining a certain length is to stabilize and guide the flow. If the depth is not enough, the metal liquid will cool down quickly. If the depth is too deep, the condensation will be too slow, which not only affects productivity but also increases the amount of return material used. ④ The cross-sectional area of the transverse gate should be greater than that of the inner gate to ensure the speed of molten metal entering the mold. The cross-sectional area of the main runner should be greater than the cross-sectional area of each branch runner. ⑤ The bottom two sides of the transverse runner should be rounded to avoid early cracks, and a slope of about 5 ° can be made on both sides. The surface roughness of the transverse runner is ≤ Ra0.4 μ M.

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The characteristics of pressure casting

The characteristics of pressure casting

Pressure casting, also known as die casting, is a casting method in which molten alloy liquid is poured into a pressure chamber to fill the cavity of a steel mold at high speed, and the alloy liquid solidifies under pressure to form a casting. The main characteristics that distinguish die-casting from other casting methods are high pressure and high speed. ① Metal liquid fills the mold cavity under pressure and crystallizes and solidifies at higher pressures, commonly ranging from 15-100 MPa. ② Metal liquid fills the mold cavity at high speed, usually between 10-50 meters per second, and some can even exceed 80 meters per second (the linear speed of the mold cavity introduced through the internal gate - the internal gate speed). Therefore, the filling time of the metal liquid is extremely short, about 0.01-0.2 seconds (depending on the size of the casting), and the mold cavity can be filled. Die casting is a precision casting method that produces die castings with very small dimensional tolerances and high surface accuracy. In most cases, die castings can be assembled and applied without the need for turning, and threaded parts can also be directly cast. Small parts such as cameras, typewriters, electronic calculators, and decorations, as well as complex parts of transportation vehicles such as cars, motorcycles, and airplanes, are mostly manufactured using die casting.

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What are the advantages and disadvantages of die casting?

What are the advantages and disadvantages of die casting?

advantage The advantages of die casting include that the castings have good dimensional accuracy. Usually, this depends on the casting material, with a typical error of 0.1 millimeters for a 2.5 centimeter size, and an increase of 0.002 millimeters for every 1 centimeter increase in error. Compared to other casting processes, its casting surface is smooth and the fillet radius is approximately 1-2.5 microns. Compared to sandbox or mold casting methods, castings with a wall thickness of approximately 0.75 millimeters can be manufactured. It can directly cast internal structures, such as wire sleeves, heating elements, and high-strength load-bearing surfaces. Other advantages include its ability to reduce or avoid secondary mechanical processing, fast production speed, casting tensile strength up to 415 megapascals, and the ability to cast high fluidity metals. shortcoming The disadvantage of die casting is its high cost. Casting equipment, molds, and related components are relatively expensive compared to other casting methods. Therefore, it is more economical to produce large quantities of products when manufacturing die castings. Other drawbacks include that this process is only suitable for metals with high fluidity, and the casting quality must be between 30 grams and 10 kilograms. In typical die casting, the subsequent batch of castings will always have pores. Therefore, no heat treatment or welding can be carried out because the gas inside the gap will expand under the action of heat, resulting in internal micro defects and surface peeling.

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Equipment for die-casting

Equipment for die-casting

Die casting machines can be mainly divided into two different types: hot chamber die casting machines and cold chamber die casting machines. The difference lies in how much force they can withstand, with a typical pressure range of 400 to 4000 tons.

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