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Precision Components Of Medical Equipment refer to various parts used in the manufacture and maintenance of precision medical equipment. It can be manufactured by CNC engraving, sand casting, transparent acrylic(PMMA/PC) 3D Printing. These parts usually require features such as high precision, high reliability and durability to ensure the accuracy and stability of the equipment.
The basic raw materials for sand molding are casting sand and sand binder. The most commonly used casting sand is siliceous sand. When the high temperature performance of silica sand cannot meet the requirements of use, special sand such as zircon sand, chromite ore sand and corundum sand are used. In order to make the sand mold and core have a certain strength, in the handling, molding and pouring of liquid metal will not be deformed or damaged, generally in the casting sand binder, the loose sand bonded together to become sand. The most widely used binder for molding sand is clay, and various drying or semi-drying oils, water-soluble silicates or phosphates and various synthetic resins can also be used as molding sand binder. The outer sand used in sand casting can be divided into three types: clay wet sand type, clay dry sand type and chemical hardening sand type according to the binder used in sand casting and the way to build strength.
Clay wet sand
With clay and appropriate amount of water as the main binder of molding sand, the sand mold is made and directly molded and poured in wet state. Wet mold casting has a long history and is widely used. The strength of wet sand depends on the proportion of clay and water mixed to form a clay slurry. Once the molding sand is mixed well, it has a certain strength, and after ramming into sand shape, it can meet the requirements of forming and pouring. Therefore, the amount of clay and moisture in molding sand are very important process factors.
A casting method in which the mold is made from sand and core sand and the liquid metal is filled with the mold under gravity to produce the casting. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting. Because the molding materials used in sand casting are cheap and easy to obtain, the casting is simple to manufacture, and can adapt to the single production, batch production and mass production of castings, it has been the basic process in casting production for a long time.
The mold used in sand casting is generally composed of the outer sand mold and the core. In order to improve the surface quality of castings, a layer of paint is often brushed on the surface of sand mold and core. The main components of the coating are powder materials and binder with high fire resistance and good chemical stability at high temperature, in addition to carriers (water or other solvents) and various additives that are easy to apply.
The advantages of clay wet sand casting are: ① the clay is rich in resources and cheap. ② Most of the used clay wet sand can be recycled after proper sand treatment. (3) The manufacturing cycle of the mold is short and the efficiency is high. ④ The mixed molding sand can be used for a long time. ⑤ After sand ramming, it can still be subjected to a small amount of deformation without damage, which is very beneficial to the drawing and core. The disadvantages are: (1) When mixing sand, the viscous clay slurry should be coated on the surface of the sand, and the high-power sand mixing equipment with kneading effect should be used, otherwise it is impossible to get good quality sand. (2) Because the molding sand has a very high strength after mixing, the molding sand is not easy to flow, it is difficult to pound, manual modeling is laborious and requires certain skills, and the equipment is complex and huge when the machine is used. ③ The stiffness of the mold is not high, and the dimensional accuracy of the casting is poor. (4) Castings are prone to defects such as sand punching, sand clamping and porosity.
Clay dry sand type The wet sand used to make this type of sand has slightly higher water content than the wet type of sand.
Clay core A simple core made of clay sand.
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