Balford manages the complete product cycle: research and development, product design, tool design and manufacturing, and assembly and sale of the completed products. This allows Balford to have a superior control of quality and cost. Balford produces 80 percent of all solenoid valve and bearing components itself.
Balford has passed ISO9001 in 2017. We has over ten years experience on manufacturing motor, solenoid valve and bearing housing, focused on auto parts.Now Balford enter into solenoid valves and bearings industry that are mainly based on difficult deep drawing process.
For the forming of stainless steel stamping parts, the choice of mold material is crucial. Generally speaking, the performance of materials will affect the quality of stamping parts, which in turn affects the dimensional accuracy and surface roughness of the final product. If the mold material is improper, it will also have adverse effects on the product itself and subsequent processing. Therefore, when selecting the mold material, the appropriate mold type should be selected according to the characteristics of the stamping part itself. Specifically, it can be considered from the following aspects: appearance design, such as shape, shape, structure, etc.; cost control, including material cost, expense, etc.; shape and surface quality.
1. Thermoplastic mold materials
At present, stainless steel stampings mainly include HB335 (martensite), HB346 (austenite), HB310 (austenite), HB460 (martensite) and HB470 (austenite) four alloy varieties. They are mainly used for the forming of alloy stamping parts, such as
- HB335 is mainly used for copper casting stamping parts, HB470 is mainly used for stamping parts and casting parts forming;
- HB460 is mainly used for alloy stamping parts and casting parts forming, such as HB460 is used for die steel and casting parts forming ;
- HB470 is mainly used for casting stamping and casting molding. Thermoplastic mold materials can be divided into plastics and castings.
Due to the relatively poor performance of plastics, it is generally not used for stamping parts, but for casting stamping parts. In the stamping parts industry, plastic products are also important and widely used in the production of various metal stamping parts, including various alloys. Stamping parts and non-metallic stamping parts; sheet metal stamping parts are also a very important stamping tool used in mass production. Plastic stamping parts are mainly used in stamping and forming production process for stamping die manufacturing and processing, such as automotive plastic stamping parts and auto parts molding process. However, plastic molds have the following disadvantages:
- 1) Plastics cannot withstand deformation at high temperatures;
- 2) Plastic molds are easily damaged and have a short service life;
- 3) Plastic deformation is difficult to eliminate after molding;
- 4) Metals are susceptible to erosion and corrosion, resulting in material failure Or seriously affect the process or quality of plastic parts.
Therefore, various measures need to be taken to avoid its impact on the service life.
2. Carburizing mold material
The carburizing process plays an important role in the forming and product quality of stainless steel stampings, so there are many types of carburizing mold materials. Common ones are austenite and martensitic superhard structure with high hardenability and uniform martensitic structure. Carburizing mold materials have good wear resistance, corrosion resistance, etc.
But the surface hardness is low, and the carburizing agent remains on the surface layer, which will cause a large degree of surface hardening and make the quality of the parts unstable after processing. Therefore, the carburizing mold material should be made of materials with high hardness, wear resistance, good weldability, and low surface hardness. Cemented carbides such as Cr are mainly used as carburizing agents. There are many types of carburizing agents, among which common chromium, carbon steel with chromium content of 35% to 40%, uniform martensite structure, carbon content of less than 0.1% and solid content of less than 0.05%, etc. The method of use is mainly to use molten steel impregnated for cold drawing or hot rolling processing. If hardening treatment cannot be carried out in time after processing, it is used as a decarburizing agent.
3. Welding mold materials
Welding molds mainly include sand molds, tungsten argon arc welding molds, and titanium argon arc welding molds. For these types, we should choose according to the size, thickness, etc. of different workpieces. For example, on thicker workpieces, arc melting can be used for welding. After the arc melts, slag can be generated, and the workpiece can be welded or ground with a grinder.
For thinner workpieces, smelting welding can be used. For some workpieces that need to be welded and formed, stainless steel or aluminum alloy can be used instead of graphite as a heat source, and argon tungsten arc welding is used for welding.