The equipment needed for the basic process of stainless steel precision casting are: precision casting wax spraying machine, ice water machine and air conditioner; Pulp dipping – pulp barrel, floating sand machine, air conditioner, dewaxing furnace, dehumidifier, dewatering barrel and static barrel. Mechanical arm and automatic centralized wax supply system can also be selected for pulp dipping; Gold melting sintering furnace, high frequency furnace and shell shaker; Post treatment – cutting machine, grinding machine, sand blasting machine, sand cleaning machine, heat treatment furnace and punch; Maintenance – pneumatic grinder, argon welding machine and grinding machine; Quality assurance – spectrometer, three-dimensional element, etc. These are common. If necessary, vacuum casting furnace, vacuum heat treatment furnace or X-ray are also required.
A. Tempering treatment of stainless steel precision casting
The purpose of tempering treatment of stainless steel precision casting: one is to eliminate the stress generated during quenching; The two feet promote the decomposition and transformation of metastable microstructure of martensite and retained austenite after quenching. The tempering temperature is usually below the eutectoid transformation temperature, about 650 ℃, and the holding time is not less than 2H. With the increase of tempering temperature, martensite precipitates carbon from the supersaturated state of carbon to form dispersed and fine carbides, and martensite finally forms massive ferrite.
1. Low temperature tempering: the tempering temperature is 150 ~ 250 ℃, and the microstructure obtained is the same fire martensite, that is, part of carbon precipitates from supersaturated martensite and forms carbides around martensite. This kind of steel has little carbon content and less supersaturated carbon in martensite. Therefore, tempered martensite itself has good toughness, carbide precipitation and stabilization, which further improves the strength and hardness of the steel.
2. Medium temperature tempering: the tempering temperature is 350 ~ 500 ℃, and the tempering structure is tempered troostite, which has good strength and toughness. This tempering process is widely used in low alloy cast steel.
3. High temperature tempering: the tempering temperature is 500 ~ 650 ℃, and the tempering structure is dispersed and granular sorbite. The treatment process of quenching + high temperature tempering is called quenching and tempering treatment. It is suitable for low alloy steel with multi-component strong carbide forming elements and has high strength and toughness.
B. Difficulties in precision casting of stainless steel
1. The work hardening of stainless steel precision casting is serious: when cutting, the work hardening tendency is large, and the tool cuts in the work hardening area, which shortens the service life of the tool.
2. Large cutting force and high cutting temperature: this type of material has high strength, large tangential stress and plastic deformation during cutting, so the cutting force is large. In addition, the thermal conductivity of the material is very poor, and the high temperature is often concentrated in the narrow and long area near the cutting edge of the tool, which speeds up the wear of the tool.
3. Stainless steel precision casting is easy to stick the knife: no matter any stainless steel, it has the characteristics of strong and tough chips and high cutting temperature. When the strong chips flow through the rake face, the tool wear will be accelerated.
4. The tool wear is accelerated. The material generally contains high melting point elements, high plasticity and high cutting temperature, which accelerates the tool wear and frequently sharpens and changes the tool, which affects the production efficiency and improves the tool use cost.
Stainless steel precision casting is an upgraded version of precision casting. The upgraded version of precision casting has a layer of shiny silver white skin, which is stainless steel. The reason why stainless steel precision casting was born is that in the last century, due to the construction of aviation jet, it had a function of isolating light and heat on the basis of precision casting.
Hebei Junya Precision Machinery Co., Ltd., founded in 2017, is a high-tech enterprise integrating product design, mold development, casting, processing, surface treatment, testing and inspection and sales services. The factory covers an area of 5000 square meters and is located in Huanghua economic and Technological Development Zone, Hebei Province. The company has superior geographical location and convenient transportation. After years of development, the company has introduced advanced production equipment and management experience in various industries, and trained dozens of excellent professional R & D and technical talents.
At present, the company has more than 100 employees and more than 20 technical and R & D personnel. The company’s main products are stainless steel cast pipe fittings, quick connectors, ball valves, check valves, precision accessories, marine hardware, cast auto parts, etc. The product material is mainly 304 304L 316 316L CF8M WCB 1.4408, etc. The company prepared for the formal certification of the iso949 quality system in 2020 and passed the iso949 certification. With its good product quality and reputation, the company has become more and more prominent in the international market, with partners all over the world.
In 2020, the export volume accounted for more than 70% of the total sales, and has established long-term and stable cooperative relations with many enterprises in Europe, the United States and Japan. The company always adheres to the business philosophy of heart, innovation and ingenuity. Based on the principle of seeking development from R & D, meeting opportunities in development, building trust in opportunities and consolidating contacts in trust, we look forward to cooperating with you. For details, please contact 18902146189
Post time: Apr-15-2022
