Basic Concepts of Precision Casting Parts
Release time:
2023-02-03
Precision casting parts include: investment casting, ceramic casting, metal casting, pressure casting, lost foam casting.
One of the more commonly used is investment casting, also known as lost wax casting: selection of suitable investment casting materials (such as paraffin wax) manufacturing mold; in the mold on the repeated dipping refractory coatings and sprinkle refractory sand process, hardening and drying of the shell; and then the internal melting mold melting away, access to the cavity; baking shell to obtain sufficient strength, and burn off the residual mold material; pouring of the required metal materials; solidification and cooling, after the shell clearing of sand, and thus obtain high-precision finished products. The result is a high precision finished product. According to the product needs or heat treatment and cold working and surface treatment.
1, the composition of the cost of precision casting process
The whole silica sol investment casting process can be divided into wax mold manufacturing, shell making, melting and pouring and post-treatment of four stages, we will serve for the four processes of inspection, equipment maintenance and other costs are categorized as auxiliary production costs. In the four production process of wax mold manufacturing, shell making, melting and pouring of the three stages of the costs incurred with the process output rate is closely related to the weight of casting accounting costs than directly with the weight of the casting more accurate accounting.
2, the main factors affecting the cost difference of castings
Strictly speaking, different castings in each process of manufacturing costs are not exactly the same, but there are small differences in the links can be accounted for in accordance with the average level, we need to pay attention to those factors that have a greater impact on the cost of castings. The main factors that lead to differences in casting process costs are as follows:
(1) process yield
Process yield rate, also known as the rate of receipt, is the actual weight of the casting weight of the casting weight of the percentage of the pouring, the specific casting process yield rate is equal to the same tree on the total weight of the casting of the tree weight percentage of the tree, which is related to the casting structure and tree grouping program, may be in the range of 30% to 60% of the range of changes, generally more between 40-50%.
(2) The number of shell layers
Due to the casting shape and structure of the different, the number of shell layers will be different. For example, castings with elongated holes or slots need to be done twice or even three times the surface layer; general castings to do two back layer is enough, while larger castings may need to do three or even more layers. The cost of making shells per kilogram of casting is about $5.9, of which material costs account for 67.8%, fuel and power account for 23.9%, and wages account for 13.3%. Of the $4/kg shell-making material cost, zirconia sand and zirconium powder consumed about 63%, accounting for 42.7% of the overall shell-making cost, and the cost of silica sol accounted for about 12.2% of the shell-making cost. Although zirconia sand and zirconium powder are only used for the top layer.
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How to choose the right material for precision casting parts?
The selection of materials for investment casting parts involves a number of factors, including performance requirements, cost, manufacturing process, and use environment. The following will introduce some common precision casting materials, and discuss how to choose the appropriate material according to different requirements.
What are the advantages of precision castings compared to traditional casting technology?
Precision castings offer many advantages over traditional casting techniques in many ways. The following are some of the main advantages: 1. Higher precision: Precision castings can provide higher precision and control of dimensions. Using CNC technology, more complex and precise parts can be produced to meet a variety of requirements. In contrast, the accuracy of traditional casting technology is limited by the accuracy of the models and molds produced, which usually makes it difficult to guarantee parts with high precision requirements.
Precision casting components and structure?
Precision casting parts are workpieces manufactured using the casting process with high precision, high surface flatness and complete internal structure. Their composition and structure vary depending on the type of workpiece.
Products involved in aviation, medical, automotive, agricultural machinery, ships, building hardware, industrial parts, decoration and crafts precision castings;
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