Product Introduction

_{Lost casting}

Lost mold castings are easy to achieve mechanized automatic production line, the production line is flexible, and the production of different alloys, different shapes and different sizes of castings can be achieved on a production line.

1. The size and shape of the casting are accurate, the repeatability is good, and it has the characteristics of precision casting.

2. High surface finish of castings;

3. The lost mold eliminates the sand mold and the core making section, and eliminates the casting defects and waste products caused by core making and core cutting.

4. No box, no mold, greatly simplify the molding process, eliminate the casting defects and waste caused by mold taking and box closing;

5. The lost mold adopts dry sand modeling without binder, moisture and any additives, which eliminates various casting defects and waste products caused by moisture, additives and binders.

6. The lost mold greatly simplifies the sand treatment system, the molding sand can be reused, and the molding sand preparation department and the waste sand treatment department are eliminated.

Seven. Shakeout is extremely easy, which greatly reduces the workload and labor intensity of shakeout;

8. The casting has no flash burr, so that the cleaning and grinding work can be reduced by more than 50%;

9. Can be set in the ideal position of reasonable shape of the gate, free from the constraints of traditional factors such as parting, mold taking, reduce the internal defects of castings;

10. The negative pressure casting of the lost mold is more conducive to the filling and shrinkage of the liquid metal, and the microstructure density of the casting is improved.

11. Combined casting, a box of many pieces, greatly improve the casting process yield and production efficiency;

12. The machining allowance is reduced and the machining cost is reduced.

_{Defect type}

Carburizing defect

Causes of carburization defects

a. In the casting process, the amount of gas generated by the decomposition of the lost mold is too much and urgent, the casting exhaust speed can not catch up with, and the vacuum pump is insufficient, which is easy to lead to the collapse and collapse of the cast;

b. The "flash flow" of metal liquid is one of the causes of the collapse defect. The so-called "flash flow" of metal liquid is that in the pouring, part of the metal liquid that has flowed into the position of filling the lost mold pattern is changed to other parts under the external action, so that the original replaced position is not occupied by metal liquid or metal filling. This kind of problem mostly occurs in the top casting, the casting has a large plane, one type and many shapes;

c. If the buoyancy of the metal liquid is too large, it will make the upper part of the mold sand easy to deform, which may lead to local collapse; Under normal circumstances, the sand intake at the top of the mold is small, and the negative pressure is not enough, which may cause the casting to be poorly formed or even unable to be formed;

d. The refractoriness and high temperature strength of the paint are not enough, and it is very easy to produce the collapse defect of the lost mold casting. The lost mold has the function of buffering the metal filling and cooling during the casting process, and can weaken the metal washing mold. When the liquid metal replaces the mold pattern and fills the cavity, the dry sand mainly relies on the support of the paint coating. When the coating strength is not enough or the refractoriness is not enough, the local mold will collapse and collapse, especially the collapse above the runner in the large part is very easy to occur.

Detection Systems

Copper Silica Sol Investment Casting

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