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14
2022
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07
Foundry - Process classification and elements of castings
People's lives can now get better and better. With the development of society, today's enterprises are also undergoing difficult transformations. Users of wear-resistant castings at home and abroad have increasingly higher requirements for the quality of wear-resistant castings, and market competition is becoming increasingly fierce, which has promoted the development of wear-resistant castings. New surface treatment technologies for various die-casting molds are constantly emerging. Below, let's take a look at the casting plant—casting process classification and elements.
People's lives can now get better and better. With the development of society, today's enterprises are also undergoing difficult transformations. Users of wear-resistant castings at home and abroad have increasingly higher quality requirements for wear-resistant castings, and market competition is becoming increasingly fierce, which has promoted the development of wear-resistant castings. New surface treatment technologies for various die-casting molds are constantly emerging. Below, let's take a look at the casting plant—casting process classification and elements.
1. Casting Plant—Casting Process Classification
(1) Traditional heat treatment process improvement technology;
(2) Surface modification technology, including surface thermal diffusion treatment, surface phase transformation strengthening, electric spark strengthening technology, etc.
(3) Coating process, including electroless plating, etc.
The traditional heat treatment process for die castings is quenching and tempering, and surface treatment technology is developed later. Since there are many types of materials available for die-casting, the same surface treatment technology and process will produce different effects when applied to different materials. Mold substrate pretreatment technology and surface treatment technology. On the basis of traditional technology, corresponding processing techniques are proposed for different mold materials to improve mold performance and extend mold life.
Another development direction for improving heat treatment technology is to combine traditional heat treatment technology with advanced surface treatment technology to extend the service life of die-casting molds. For example, combining chemical heat treatment methods such as carbonitriding and NQN (carbonitriding, quenching-carbonitriding) with conventional quenching and tempering processes not only obtains higher surface hardness, but also increases the effective depth of the hardened layer. The layer hardness gradient distribution is reasonable, and the tempering stability and corrosion resistance are improved, so that the die-casting mold can obtain a good core shape, and its surface quality and performance have been greatly improved.
2. Casting Plant—Casting Elements
(1) The selection of wear-resistant casting materials should be reasonable, should meet the wear-resistant characteristics, and the casting structure should be refined and evenly distributed (to ensure good mechanical properties).
(2) The metallurgical quality of castings should be pure and purified, especially the metallurgical quality of grain boundaries (to ensure uniform wear and clean and green castings).
(3) The casting should be close to purification, and the casting quality must be excellent (to ensure the quality of wear-resistant castings).
(4) The performance should be reliable, durable and economical (improve competitiveness, commodity value and economic benefits).
Product development is not possible overnight, but requires long-term theoretical innovation and practical accumulation to achieve breakthroughs. Simply put, it is a process of quantitative change leading to qualitative change. In the low-pressure casting process, a holding furnace is used. Holding furnaces have also been developed for a long time.
(1) Casting Plant—Iron Crucible Boiler
This is a practical furnace type in the early stage. It is easy to operate, so it is still widely used. However, because the molten iron will gradually increase the iron content, it must be coated regularly (1 week). In addition, it is not suitable for casting high-purity alloys.
(2) Casting Plant—Graphite Crucible Boiler
Because graphite crucibles cannot be directly pressed, they are pressurized furnaces. It has little corrosion and can be used continuously for about 90-120 days. However, the disadvantage is that sodium modification will shorten the life of the crucible.
(3) Casting Plant—Refractory Material Furnace
With the development of large-scale casting and multi-mold, the use of this type of furnace is gradually increasing. Due to the long life of the heating tube, inconvenient maintenance, and high cost, the popularity of use has been affected, but from the perspective of energy saving, it will soon become popular in the future. Therefore, it is necessary to develop a casting plan suitable for this equipment.
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