မီးခိုးရောင် Cast Iron အစိတ်အပိုင်းများ

The basic characteristics of high-density shaped sand of gray iron castings are that the amount of pulverized coal is also low. Accordingly, should grasp the following points when matching sand.

① Clay content and mud content. The type of sand with high clay content also increases its strength with the specific pressure increase, and usually the effective bentonite is controlled at 7%~10%. The sum of the effective clay and the dead clay in the type sand is equivalent to the mud content, and the mud content is generally controlled at 12%~16%. Too high or too low mud content will affect the performance indexes of the type of sand.

② Shuifen. The moisture in the manufacturing sand is the main factor that determines the plasticity and bonding force of clay. When the water is too high, it is easy to cause the deterioration of the clay cohesion, the fluidity of the sand decreases, and the uniform casting density can not be obtained. When the moisture is too low, the sand is not easy to mix well, the sand has low strength, brittleness, poor mold, easy to produce sticky sand defects. General water should be controlled to be 10%~20% higher than the peak wet pressure strength.

The basic characteristics of high-density shaped sand of gray iron castings are that the amount of pulverized coal is also low. Accordingly, should grasp the following points when matching sand.

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