Casting method is commonly used sand mold casting, followed by special casting method, such as: metal mold casting, investment casting, plaster mold casting... And so on. Sand mould and sand mould casting can be divided into clay, and organic binder sand mold, resin self-hardening sand mold, mold and so on.
Casting method is commonly used sand mold casting, followed by special casting method, such as: metal mold casting, investment casting, plaster mold casting... And so on. Sand mould and sand mould casting can be divided into clay, and organic binder sand mold, resin self-hardening sand mold, mold and so on.
The principle of casting method choice:
1
Preferred sand mold casting, the main reason is sand mold casting compared with other casting method of low cost, simple production process, short production cycle. 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.
2 casting method with the production batch. Low pressure casting, die casting, centrifugal casting and other casting method, for equipment and mold is expensive, so only suitable for mass production.
3 modelling method should be suitable for factory conditions.
Also is the production of large machine tool lathe bed casting, such as, for example, 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 not) to do the product.
4 to casting accuracy requirement and cost.
Sand casting, production of castings in sand mold casting method. Steel, iron, and most of the sand mold casting method for nonferrous alloy casting are available. Because of sand mold casting molding materials used in the cheap, simple mould manufacturing, piece of casting production, the batch production and mass production are able to adapt to, for a long time, has been the basic technology of casting production.
The basic raw material is sand casting sand mold manufacture and sand binder. The most commonly used foundry sand is silica sand. Silica sand cannot satisfy the requirement of high temperature performance, the use of zircon sand and chromite sand, corundum sand and other special sand. Made for the sand mould and core has a certain strength, when handling, type and pouring liquid metal, without deformation or damage to the general to add sand binder in foundry, will become a sand loose sand bonded together. Is the most widely used sand binder clay, also can be used in a variety of drying oil or semidrying oil, water soluble silicate and phosphate and a variety of synthetic resin as a sand binder. Used in sand casting sand mold by sand binder used in the outside of the green sand mold and build strength in different ways into clay, dry clay sand mould and chemical hardening sand mold.
Sand mold casting of crusher wear parts for the [2] is very common in China, like jaw, high chromium plate hammer, crushing wall, rolling mortar wall and so on, because in crusher equipment, as a larger wear resistant castings, relatively accuracy is not high, especially such as jaw, out of the finished product is almost no lathe polishing, crushing wall, roller rolling mortar wall, is just like casting parts need lathe polishing, so especially suitable for use sand mold casting, because of the sand mold casting jaw plate, high chromium plate hammer, crushing wall rolling mortar wall, roller, leather and so on the crushing equipment of wear parts more durable than other products such as lost foam casting process more than 20%. But lost foam casting has high dimensional precision, small machining allowance, dry sand shakeout, convenient and clean up grind the workload is reduced by more than 50%, save labor cost, so the price of the epc is relatively low.
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