Gantry machining center is an important working machine in mechanical processing, which is widely used in mechanical manufacturing and machining. The high accuracy of the gantry machining center itself is the accuracy guarantee of other products that need to be processed. The basic accuracy and deformation difference of gantry are very demanding. Then how to ensure the accuracy of the gantry and reduce the deformation of the gantry itself? The cross beam is the key part of the gantry machining center, which is the bridge connecting the Y and Z axis parts. Its design accuracy and processing accuracy directly affect the geometric accuracy and position accuracy of the machine tool. In fixed beam gantry milling machine, the accuracy of beam guide rail is the most important. How to reduce the deformation of beam guide rail in design and parts processing is the key to ensure the accuracy of machine tool. The following Kunshan Duyang CNC will share with you how to reduce the deformation of the beam guide rail. 1. Manual aging treatment After the completion of the casting and roughing, the beam castings have accumulated a lot of stress, which is slowly released over time, causing the size of the beam to be unstable and the straightness to change. Therefore, it is necessary to annealing the beam after the completion of casting to eliminate the casting stress; After roughing, secondary annealing or vibration aging treatment to eliminate processing stress; After stabilizing the size of the beam, the grinding guide rail is finished to ensure the accuracy and stability of the guide rail. 2. Clamping process of milling grinding The clamping method of milling grinding processing is also the key, during the clamping process, can not be used to press clamping, otherwise it is easy to be distorted by the height of the clamping position, resulting in the distortion of the beam after clamping, or after pressing, temperature changes will also make the beam distorted. Therefore, only the bottom surface (that is, behind the beam) can be placed flat, and the four sides can be positioned against it. If the bottom surface is uneven, a gasket of appropriate thickness needs to be inserted and then processed. Cut can not use the press block to press down on the side round hole, push the beam down. 3. The precision of guide rail after grinding is subject to ambient temperature and grinding amount The temperature change will have an impact on the machining accuracy, ensuring that the temperature change before and after the clamping and processing is small. When clamping with fixed downward pressure, the temperature difference will cause the deformation of the beam, and the computer software analysis will cause the deformation of the temperature difference of 10℃, and the concave of the guide rail surface is about 0.06mm. In the actual grinding test, the beam guide rail is concave, and after grinding, the guide rail will be convex deformation of about 0.06mm after thermal balance. It is basically consistent with the actual situation. In order to solve this problem, the beam from the outdoor to the grinding machine workshop must be cooled to reach a thermal balance equal to the indoor temperature before clamping and processing, requiring the coolant to be basically consistent with the room temperature.