Wuxi IDEAL Machinery Manufacturing Co., Ltd. is discussing with you about the manufacturer of shot blasting machine:Test method for residual stress of hook casting of shot blasting machine.

The production of the casting stress of the shot blasting machine manufacturer is mainly due to the different temperature difference of different parts, the different cooling speed, the casting method, aggregate, the shortening of the casting system and other factors. In order to reduce the casting stress of the hook casting, various methods should be adopted to reduce the internal temperature difference of the casting and improve the inclination of the casting and the core during the cooling process. First, reduce the temperature difference of each part of the casting. During the casting process, speed up the thickness cooling of the mouth and chill iron to make the casting form and solidify together.

Reduce the thickness difference of castings, loose or reduce the thermal connection, and satisfy the application requirements. The invention can be widely used in metal and melt casting. Increase the production of casting cores and cores. You can use some methods to control the appropriate type, compact center, add better franchise materials (such as sawdust), or use early box or loose sand to reduce shortening.

Select small elastic modulus and shortening coefficient α To satisfy the casting function. Even if the above method is adopted, the method of eliminating casting stress cannot eliminate the stress in the casting process. The remaining stress in the casting process can be eliminated by the following methods. This method is to heat the casting to TK, even if the casting is within the plastic temperature range. At this temperature, keep it for a certain time to make the temperature of all parts of the casting uniform and the stress disappear, and then gradually cool down with the furnace to avoid the formation of new stress from scratch, which is usually called artificial aging (also called thermal aging, internal stress relief annealing, etc.).

Price of shot blasting machine

A series of process parameters, such as heating speed, heating temperature, holding time and cooling speed, are confirmed, and are related to alloy function, casting structure and cooling conditions. The invention has the advantages of stress relief, short cycle, small floor area, wide production and use, but the disadvantages are high fuel consumption, easy to produce oxide layer and particle size changes, and high cost. Natural aging.

This is to place the casting with residual stress in the open air for several months or longer. With the change of natural temperature for a long time, the casting deformation is very slow, and then the residual stress is removed. The invention has the characteristics of low cost, long construction period, large floor area, low output power, stress relief, etc. Therefore, it is rarely used in modern production. The invention is a method of vibration casting for 10~60min under resonance (400~6000Hz) to eliminate residual stress.

Its advantages are: short time, low equipment cost, light structure, no oxide skin, no change of casting size, no restriction of casting size, saving labor and fuel, easy to produce mechanization and automation. There are many remaining stress test methods (including electromechanical test, stress specification, open-loop method, semi-circle method, etc.), but the basic principles are the same. In other words, the internal tension and compression of the sample are damaged by two kinds of equilibrium stress (or sample deformation) to measure the remaining stress.

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