Large scale machine tool castings

Large machine tool castings are made of resin sand and lost foam solid casting, with a single piece weighing over 40 tons. The machine tool castings include the machine tool bed, worktable, column, crossbeam, and gantry top connecting beam. The bed body castings have good shock absorption properties; Low melting point, good fluidity, and small shrinkage rate; The material is made of cast iron HT250-300, which has a long service life.

Large machine tool castings have good process performance. Due to their manufacture of gray cast iron, which has a high carbon content and is close to eutectic composition, the melting point is relatively low, the flowability is good, and the shrinkage rate is small. Therefore, they are suitable for casting complex or thin-walled castings. Similarly, due to the ease of chip formation during cutting caused by graphite, the machinability of gray cast iron is superior to that of steel.

Characteristics of castings

(1) Disappearing mold castings have good shock absorption properties. Due to the favorable lubrication and oil storage properties of graphite in cast iron. Similarly, due to the superior shock absorption properties of graphite compared to steel.

(2) Good process performance. Due to its high carbon content and eutectic composition, gray cast iron has a relatively low melting point, good flowability, and low shrinkage rate, making it suitable for casting complex or thin-walled castings. In addition, due to the tendency of graphite to form chips during cutting, the machinability of gray cast iron is superior to that of steel.

The quality management of a foundry includes two parts: casting quality control and casting methods. Is he implementing a quality system in the factory under the premise of reasonable technical requirements for castings. For the foundry industry, its characteristics are a quality system implemented in factories under the premise of standardized and reasonable casting technology requirements. For the foundry industry, this is reflected in the causes of defects. Therefore, for defect control in casting quality management, prevention should be given top priority, and continuous research should be conducted to solve various quality problems. We also need to actively conduct market research, constantly grasp the quality requirements of consumers or users, and provide serious after-sales service to ensure market quality. Quality management is the sum of activities that integrate production inspection and sales services.