Oversized machine tool bed castings can be produced by splicing, and the castings can be cast separately. During machining, the entire piece is processed as a whole, ensuring the installation and usage precision of the bed castings.

The CNC gantry milling machine features a closed hydrostatic system for the worktable bed guideways and a hydrostatic worm gear pair for the worktable feed. During operation, the worktable feed speed is unstable, exhibiting tremors, which requires detection, analysis, and modification. The machine tool bed castings are produced using a resin sand production line and cast via the lost foam process. The advantages of this process are: 1. The production process is pollution-free and environmentally friendly. 2. The surface smoothness is close to precision casting, with a stable internal structure that eliminates or reduces casting defects such as sand holes and porosity. 3. The castings have high dimensional accuracy, uniform consistency, no need for box shaking, and are free of flash or burrs.

Principles for casting machine tool bed castings: 1. Use sand casting. Sand casting is cost-effective, simple in process, and has a short production cycle. When sand casting cannot meet requirements, a new model can be promptly adopted. 2. The casting method should correspond proportionally to the production batch. Based on the cost of equipment and molds, reasonably apply casting methods to determine product output. 3. The molding method should suit the factory conditions. Enterprises should rationally select product development according to their own production conditions.

Machine tool castings include the bed, worktable, column, gantry top, and connecting beam. The material is high-quality, fine gray cast iron HT200-HT300, with precise ratios and higher tensile and bending strength. Internationally popular heat treatment processes minimize stress deformation in the castings, ensuring long-term stability during use.