The device can also be used for disassembling other similar parts, which has a very good promotion value. (: 2012-10 Preliminary Study on the Anti-sticking Sand Process of china Copper elbow Lost Foam Casting Wang Lingjun Liu Xiaojun Guo Qingjie 12 (1. Zhengzhou Golden Century Machinery Co., Ltd., Dengfeng 452473, Henan; 2. Daping Coal Mine of Zhengzhou Coal Group, Dengfeng 452473, Henan) Since the invention of the lost foam casting process, the coal mine electromechanical bookmark3 has been widely used because of its advantages of high production efficiency, low investment, low consumption, easy to master process technology, and low labor intensity. However, in use, the problem of sand sticky castings often affects The appearance quality of the product will cause the casting to be scrapped when serious, and cause a certain economic loss to the enterprise.
Therefore, it is of great significance to solve the problem of anti-sticking sand for castings. The vinyl plastic mold replaces the casting mold for modeling. The model is a solid mold. The vacuum negative pressure is used to solidify the dry sand and pour into the metal liquid to vaporize the model and replace the two to obtain an ideal casting. It is a molding method. The process is divided into the production of the model, the application of hanging paint, the drying of the model, the vibration modeling, the vacuum negative pressure pouring, the box cleaning, etc. Links. The sticky sand of castings is mainly mechanical sticky sand and chemical sticky sand. The reason for its formation mainly involves the following process links in the production of castings. The preparation of paint.
The mismatch between the water-resistant aggregate and the metal liquid causes chemical stickiness Sand; water-resistant aggregates are not water-resistant enough to resist the heat effect of the metal liquid. The water-resistant aggregates shrink greatly, and the paint has poor resistance to cold shock heat. Shedding or cracking when heated will cause the metal liquid to contact with the dry sand; The layer is too thin to effectively isolate the penetration of the metal liquid; the model is not dry when it is dried, or is placed improperly, so that the model regains moisture; the coating strength is not enough when spraying, or the coating peels off and not reapplied when packing. Cause mechanical sticky sand. Excessive vibration force or long vibration time will also cause the coating to peel off. High vacuum negative pressure will cause serious sand sticking. The degree of metal liquid penetration is proportional to the pouring temperature speed and pressure. The higher the temperature , The higher the speed, the higher the pressure, the easier it is to stick sand. The sand has a large particle size and poor thermal conductivity, and it is also prone to sticking sand. Improper setting of the riser will cause sticking when local overheating occurs Sand. 2 Anti-sticking sand process measures The formulation of anti-sticking sand measures involves all aspects of the production process and process performance. The selection of process parameters needs to take into account all process performances. The various processes on site production need to be closely coordinated before they can be done. The need for anti-sticking sand. This will not affect the other properties of the product, and can produce high-quality castings.
wormbushing 