Analysis of the whole process of stainless steel casting processing: from mold design to finished product processing
Stainless steel casting processing is a common metal forming process, widely used in machinery manufacturing, chemical equipment, medical equipment and other fields. This article will introduce in detail the entire process of stainless steel casting processing, including mold design, smelting pouring, post-processing and other key links to help readers understand its process characteristics and technical points.
1. Mold design and production
Mold is the basis of casting, and its quality directly affects the dimensional accuracy and surface quality of castings. Commonly used mold types for stainless steel casting include sand molds, metal molds and investment casting molds.
sand casting: Suitable for castings with complex structure and large size, with low cost but relatively poor surface finish.
Metal mold casting: Suitable for mass production, long mold life, and relatively stable casting dimensions.
Investment casting (lost wax casting): Suitable for stainless steel castings with complex shapes and high precision requirements, but the cost is high.
Factors such as shrinkage rate, draft angle, gating system, etc. need to be considered when designing the mold to ensure the quality of casting molding.
2. Smelting and pouring
The main components of stainless steel are iron, chromium, nickel and other elements. The melting temperatures of different grades (such as 304, 316) vary, usually between 1500 degrees Celsius and 1600 degrees Celsius.
Raw material selection: Use scrap steel that meets the standards and alloy elements for proportioning to ensure that the chemical composition meets the standards.
Melting control: Use electric arc furnace or intermediate frequency furnace for smelting, and strictly control the temperature to avoid oxidation and gas inclusion.
Pouring process: Pouring speed, temperature and gate design will all affect the quality of castings. Defects such as cold shuts and pores need to be avoided.
3. Casting cleaning and post-processing
After cooling, the castings need to be cleaned and subsequently processed to improve their performance and appearance quality.
Go to the riser:Remove excess by cutting or tapping.
surface treatment: Use sandblasting, shot blasting and other methods to clean the surface oxide scale and residual sand.
heat treatment:Solution treatment can improve the corrosion resistance of stainless steel and eliminate casting stress.
machining: Carry out finishing processing such as turning and milling when necessary to ensure that the dimensions meet the requirements.
4. Quality inspection and FAQ
The quality inspection of stainless steel castings includes dimensional inspection, non-destructive testing (such as X-ray, ultrasonic testing) and chemical composition analysis. Common casting defects include:
stomata(The gas is not completely discharged during smelting)
Shrinkage(Caused by uneven cooling shrinkage)
crack(Caused by stress concentration or excessive cooling)
By optimizing process parameters and strict quality control, the defect rate can be effectively reduced.
Stainless steel casting processing involves many key links, and each step needs to be strictly controlled to ensure that the performance of the casting meets the usage requirements. Selecting the appropriate casting process, optimizing the mold design, controlling the melting quality, and cooperating with appropriate post-processing can produce stainless steel castings that meet the standards.