DETAILED EXPLANATION OF SAND-COATED IRON MOLD PRODUCTION LINE TECHNOLOGY
Throughout the production of wear-resistant ball casting from forging, sand casting, iron mold casting to the current sand-coated iron casting, each is a qualitative leap. With the development of new technology, there is still a small proportion of wear-resistant steel balls in the mining market because of their advantages in impact toughness, but the market is still shrinking due to the inability to break through the shackles of material quality and hardenability It will take more effort from colleagues to make a big leap. Sand casting finished the transformation of wear-resistant steel ball from common white iron to alloy white iron. Iron Die Casting, because of its unique cooling characteristics, can refine the grain of wear-resistant steel balls, significantly improve the wear resistance of wear-resistant casting balls, and has been sought after by the market, with the advent of combined iron mold, simplified the production of wear-resistant casting balls Increased the production of wear-resistant steel balls, so these 20 years with the combination of iron mold production of wear-resistant cast ball has dominated the market position.
Sand-coating in the iron mold is a new technology of wear-resistant casting in recent years. It has the advantages of iron mold and sand mold. It has the characteristics of chilling in an iron mold, small casting stress and good toughness This is a very big breakthrough for the production of wear-resistant steel balls. In addition, coated sand is widely used in automatic production because of its good fluidity, filling ability and good appearance, which will lead to a new revolution in the production history of wear-resistant steel ball —— automatic production of wear-resistant casting ball.
The automatic production of wear-resistant steel balls has always been the dream of the wear-resistant ball production enterprises because the wear-resistant ball production environment is the very mode of production, the working site temperature is high, and the casting mold is relatively unwieldy It’s also dangerous. In order to produce good products, people’s physical quality and technical quality are required to be very high. front-line technicians have always been a bottle-neck problem troubling the wear-resistant cast ball production enterprises, and with the improvement of living standards, this problem of employment will be even more acute. This is also the wear-resistant cast ball enterprises cannot be the rapid growth of the main reasons.
Through more than ten years’efforts, our company has successfully developed a fully automatic production line of sand-coated iron mold and the semi-automatic production line of water glass sand mold. Now the automatic ball casting production line has been successfully applied to more than 100 units and extended to wear-resistant ball casting outside the foundry enterprises, for the industrialization of these enterprises provide a strong support. We have not only successfully applied sand coating process in iron mold, but also made a revolutionary change in the weakness of the too large heat preservation area in the manual iron mold, and reduced the crystal grain gradient of the wear resistant ball to the maximum extent Make wear-resistant ball out of the round probability from the process has been very human changes. The appearance of the products is different as shown in the figure below. We can clearly see that the products produced by the production line of wear-resistant casting balls have no heat preservation area except the gate.
On the left is a cast ball produced in the normal way, and on the right is a cast ball production line. In order to ensure that the wear-resistant ball has not only the cooling advantage of iron mold but also the characteristics of sand mold casting, such as low stress and good toughness, we systematically do the software simulation and practical experiments on the size of the wear-resistant ball and the sand-coated thickness of the Iron Mold A large number of comparative experiments were done and the optimized results were applied to the production of the cast. The impact toughness of high chromium ball is between 4.5 – 5.5J/cm², which is relative to the impact value of 2.5J/cm² produced by common iron mold Impact toughness is up to 50 %. It provides a good production platform for ball mill with high-quality chromium ball to a larger size.