Reason: Under the influence of internal and external heat sources, various components of the gantry milling machine will undergo varying degrees of thermal deformation, causing the relative motion relationship between the workpiece and the tool to be disrupted. For gantry milling machines, because the entire machining process is controlled by computational instructions, the impact of thermal deformation is even more severe.

In order to reduce thermal deformation, the following measures are usually adopted in the structure of gantry milling machines.

1: After taking a series of measures to reduce heat sources to control temperature rise, the situation of thermal deformation will be improved. But it is usually very difficult, even impossible, to completely eliminate the internal and external heat sources of gantry milling machines. So it is necessary to control the temperature rise through good heat dissipation and cooling to reduce the influence of heat sources. One of the more effective methods is to forcibly cool the heating part of the gantry milling machine, or to heat the low-temperature part of the gantry milling machine to make the temperature of each point of the gantry milling machine tend to be consistent, which can reduce the warping deformation caused by temperature difference.

2: The main heat source that causes thermal deformation during internal heating of the gantry milling machine should be separated from the main machine as much as possible to reduce heat generation.

3: The improvement of the spindle box for gantry milling machines should try to make the thermal deformation of the spindle occur in the vertical direction of the tool cutting. This can minimize the impact of spindle thermal deformation on the machining diameter. In terms of structure, the distance between the center of the main shaft and the ground should be minimized as much as possible to reduce the total amount of thermal deformation. At the same time, the temperature rise of the front and rear of the main shaft box should be consistent to avoid tilting after deformation of the main shaft.

4: Improving the gantry milling machine mechanism also has a significant impact on thermal deformation under the same heating conditions. The single column mechanism used by gantry milling machines in the past may be replaced by a double column mechanism. Due to left-right symmetry, the main axis of the double column mechanism undergoes minimal deformation in all directions except for vertical translation when heated, and the vertical axis movement can be easily compensated for with a coordinate correction.

For more detailed information, please consultLarge gantry boring and milling machine manufacturer-Wuxi Changcheng Machinery Manufacturing Co., Ltd.