A good way to using medium frequency furnace smelting foundry casting

by:Hengyang Furnace     2020-04-07
Using the intermediate frequency furnace smelting with sand mold casting according to the statistics, our country or the world, in all the intermediate frequency furnace casting production, 60 to 70% of the casting is made of sand mold production, and about 70% of them are using clay sand mold production. The main reason is that sand mold casting compared with other casting method of low cost, simple production process, short production cycle. So like a car engine cylinder block, cylinder head, crankshaft, etc are of clay green sand casting process. When wet can't meet the requirements to consider using clay sand table dry sand, dry sand mold or other mould. Coatings for green sand mold casting can be from a few kilograms to tens of kilograms of weight, and clay dry production castings can weigh up to dozens of tons. Adopt the good method of intermediate frequency furnace smelting foundry casting in general, for medium and large casting, iron castings can be used resin self-hardening sand mold casting parts can be production of water glass sand mold, can obtain precise dimension, smooth surface castings, but the cost is higher. Of course, the sand mold casting production of precision castings, surface finish, the density of material and microstructure and mechanical properties are often poor, so when casting these performance requirements higher, other casting method should be used, such as casting ( 2. Intermediate frequency furnace casting method with the production batch to accommodate such as sand casting, mass production of the factory should create conditions for the modelling of advanced technology, core making method. Old jar type or shock squeeze moulding machine production line productivity is not high, workers labor intensity, large noise, not adapt to the requirement of mass production, shall be modified step by step. For small castings, can use horizontal parting or vertical parting flaskless type high pressure molding machine production line, solid modeling and production efficiency is high, covers an area of less; For the thing that can be used in various cases of high pressure molding machine production lines, air impact molding line, in order to adapt to the requirement of fast, high precision molding production lines, core making method can be used: cold core box, hot core box, shell core efficient core method, etc. Medium batch of large castings can consider application self-hardening resin sand molding and core making. Sheet small batch production of heavy castings, manual modeling is still the important method, manual can meet the requirements of various complex is more flexible, does not require a lot of process equipment. Can be used sodium silicate sand, sodium silicate sand mold VRH law, organic ester sodium silicate self-hardening sand, clay self-hardening sand mould and dry type, resin cement sand mold, etc. ; For a single production of heavy castings, pit modelling method of low cost, fast production. Batch production or long-term production of finalize the design product box, split box shape modelling method is appropriate, although high mould and sand box to start investing, but from compensated save modelling cycle time, improve the quality of its products. Low pressure casting, die casting, centrifugal casting and other casting method, for equipment and mold is expensive, so only suitable for mass production. Using medium frequency furnace smelting method should be suitable for conditions such as modelling also is the production of large machine tool bed casting, generally USES the core modelling method, don't make shape and sand box, core in a hole in the ground; While other factories use sand box modelling method, production. Different enterprise production conditions ( Including equipment, sites, staff quality, etc. ) , production habits, accumulated the experience of each different, what should be considered according to these conditions suitable for products and is not suitable for ( Or can't) What to do.
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