Different manufacturing methods of stainless steel spheres
1. Stainless steel ball casting method: This is also a traditional processing method, which requires a complete set of smelting, pouring and other machinery and equipment, as well as a large industrial plant and many employees. The project investment is large, the process flow is multiple, the production process is complicated, and the environmental pollution is high. The technical strength of the employees in each process can directly affect the quality of the equipment. The problem of water leakage from the skin pores of the ball cannot be completely eliminated. The rough processing capacity is large and the consumption is high. It is usually found that it is damaged due to defects during the entire processing. The Jingmen series bearings increase the cost of stainless steel balls.
2. Stainless steel sphere forging method: This is also another method adopted by many valve companies in China. There are two processing methods: one is to use circular steel to break and heat forge into a spherical solid core blank, and then carry out mechanical equipment processing. The second method is to mold the stainless steel plate that is cut into a ring shape on a large and medium-sized stamping machine to obtain a hollow hemispherical blank, and then carry out mechanical equipment processing on the welded spherical blank. This method has a high utilization rate of raw materials, but requires a high-power stamping machine, heat treatment furnace, and argon arc welding machine equipment. It is estimated that the project investment must be 3 million yuan to produce production efficiency.
3. Stainless steel ball spinning method: Metal material spinning method is an excellent low cutting and non cutting processing method, belonging to a new branch of working pressure processing. It combines the processing characteristics of forging, extrusion, rolling and extrusion forming, and has a high utilization rate of raw materials (up to 80-90%), saving a lot of processing time (1-5 minutes for forming). After spinning, the compressive strength of raw materials can be doubled. Because during spinning, the spinning wheel comes into contact with a small total area of the product workpiece, and the metal material is subjected to two-way or three-way pressure, which facilitates deformation. With a small driving force, a high enterprise contact pressure (up to 25-35Mpa) can be obtained. Therefore, the machine equipment is lightweight and requires a small total output power (less than 1/5-1/4 of the stamping machine). It has been recognized by the overseas valve field as an environmentally friendly and energy-saving ball processing technology plan, Jingmen series bearing scheme, and is also suitable for processing other hollow rotating body parts. Spinning technology has gained widespread application and rapid development trend overseas, with complete and stable processing technology and machinery equipment.
4. Process standards for spinning stainless steel ball blanks: Based on the production and manufacturing requirements of our factory and the integration of spinning deformation special Jingmen series bearings, the following technical standards are formulated: raw materials and forms of spinning stainless steel ball blanks: seamless Jingmen series bearing steel pipes or thick steel plates of 1Gr18Nr9Tr and 2Gr13.
5. Spinning forming plan: Stainless steel ball spinning has different actual effects due to the different blank forms used.
6. Seamless steel pipe diameter reduction spinning method This plan is divided into three steps: the first step is to disconnect the seamless steel pipe according to the specifications of the Jingmen series bearing, clamp it in the spindle chuck of the spinning lathe, and rotate it together with the machine spindle. The spinning wheel uses hydraulic press imitation equipment to spin the pipe material many times, gradually reducing its diameter and edge, producing a semi-circular sphere; The second step is to cut off the established spherical part and process the electric welding seam; The third step is to use argon arc welding to weld the two hemispheres together with the required hollow spherical blanks.
