Structure and material of casting bed

Machining centers are divided into horizontal and vertical machining centers according to the position relationship between the spindle and the worktable.This lathe body is used as a vertical machining center bed, which mainly bears the main components such as the head box and worktable of the lathe. It provides running track and good precision service for various movements of the lathe. It requires high load-bearing and stability. Cast iron is mostly used in the lathe body.

Various movements can produce vibration of different sizes and frequencies. In order to keep the accuracy of the machine tool free from various vibrations, the machine body bears the function of vibration absorption and stabilization.In this paper, CREO is used to build three-dimensional model of the lathe body, ProCast software is used to simulate the casting process, predict the casting defects, and determine the best casting process route to obtain the best casting quality.

The three-dimensional entity of this part is shown in the figure.The overall structure of the part is complex. There are many threaded holes and holes. The structure is symmetrical with each other. The inner part has ribs and many cavities. The two guide rails on the upper surface of the part are important machined surfaces, which require high casting quality.

The overall contour size is 1985 mm x 1650 mm x 460 mm, the minimum wall thickness is 18 mm, the main wall thickness is 25mm, and the wall thickness is relatively uniform.Using CREO measurement function, the metal density is 7.3 g/cm3 energy, the metal density is 7.3 g/cm3, 3, and the total mass of the part is 1762.75 kg.

Casting material is HT250, pearlite type grey cast iron. Grey cast iron has good flowability, small volume and line shrinkage, easy to cast, and can cast complex-shaped castings with good wear resistance and vibration absorption. Cast iron has large internal friction and strong damping effect, so it is a traditional bed structure material with good dynamic rigidity.