A New Type of Precision Casting Process

Abstract

The invention discloses a novel precision casting process. A high temperature resistant coating comprises 5-10% of rare earth, 70-80% of refractory mortar, 5-10% of silica sol, 5% of curing agent and a certain amount of water; the high temperature resistant coating and an AB type two-component polyurethane coating in the proportion of 1:1 are sequentially sprayed on a plastics absorbing mould. Through usage of the high temperature resistant coating and the AB type two-component polyurethane coating and the process that a moulding flask cooperates with micro-vibration, the surface of the product is smooth and free of burrs, the plastic mould is simple in production process and reusable, cost is lowered greatly, labor is reduced greatly, but yield is increased by two to three times, the plastic mould is needless of evacuation and free of pollution by the design, and cost is lowered greatly.

Description

technical field [0001] The invention relates to the field of precision casting of metals, in particular to a novel precision casting process. Background technique [0002] At present, the traditional domestic precision casting, also known as lost wax casting, mainly has the following problems: 1. The traditional precision casting has great pollution to the surrounding environment, mainly including ammonia water, paint slurry, quartz sand ash and other polluting raw materials, which are harmful to the human body It is very large, and the untreated sewage after losing wax flows into the river, causing great harm to surrounding crops and downstream residents; [0003] 2. The main defects of traditional precision casting: low density, rough surface, and pores, especially the pores invisible to the naked eye. After the casting is processed, the coating is not resistant to temperature enough, especially stainless steel, resulting in batch scrapping of products; [0004] 3. In the...

AI Technical Summary

Problems solved by technology

[0002] At present, the traditional domestic precision casting, also known as lost wax casting, mainly has the following problems: 1. The traditional precision casting has great pollution to the surrounding environment, mainly including ammonia water, paint slurry, quartz sand ash and other polluting raw materials, which are harmful to the human body It is very large, and the untreated sewage after losing wax flows into the river, causing great harm to surrounding crops and downstream residents;

[0003] 2. The main defects of traditional precision casting: low density, rough surface, and pores, especially the pores invisible to the naked eye. After the casting is processed, the coating is not resistant to temperature enough, especially stainless steel, resulting in batch scrapping of products;

[0004] 3. In the traditional precision casting method, due to the insufficient temperature resistance of the coating, the first layer of mortar particles are coarse, the particle density is not enough, it is easy to crack, and the dryness is not enough, it must be baked before casting; if the casting is not completed in time after baking, the Casting after a period of time due to strong water absorption will cause the product to be scrapped;

[0005] 4. To make a new product, you must first open the steel mold. The size of the product is different, and the price is different. There is a steel mold cost of 500-10,000. The molding process is complicated, the cost is high, and the pollution is large;

[0006] 5. Traditional crafts require a lot of labor, generally 50 workers;

[0007] 6. The domestic traditional craft is to use hot forging (copper), the density and smoothness can be achieved. There are three, five, and ten forged water dividers, each of which is arranged in sequence with ball valves, but the forged water dividers are all It is solid and cannot be drilled, but the consumables are labor-intensive, a large amount of equipment is required, and there is a lot of recycling waste; in addition, brass stays in the water for a long time, causing copper rust, and copper rust water causes human injury;

[0008] 7. The water separator produced by traditional stainless steel can only be welded with stainless steel, but the appearance of the welded product is poor, the cost is increased, and there will be some leakage, causing quality problems;

[0009] 8. The traditional lost wax casting process is too complicated. (1) The white wax needs to be melted. (2). Soaking slurry, (4), pouring fine sand to the first slurry, (5), repeatedly pouring sand, (6), waiting for soaking slurry and splashing sand, hang dry, remove, (7), water temperature at 90°C-100°C Start to lose wax, (8) hang to dry after losing wax, (9), dry in the drying tunnel after drying, (10), carry out casting