Large-scale gantry milling aluminium parts because of its relatively soft materials, resulting in chip removal difficulties, aluminium parts are easy to be cut because of high temperature oxidation, so it is difficult to cut, will also cause workpiece deformation:
Small Skills in Milling Aluminum Parts with Large Gantry
Reasons for deformation of aluminium workpiece in large gantry milling process:
In the process of blank manufacturing and cutting, the workpiece undergoes heat treatment. Because of the uneven heating, the workpiece’s internal residual stress is generated. In the process of online cutting, the workpiece material is cut off in large quantities. With the passage of time, the workpiece is deformed.
Deformation solutions:
1. Processing of piercing holes
Outer contour processing is often used in large-scale gantry milling. This method can easily cause stress release in materials, resulting in deformation and reduce the accuracy of parts processing. At this time, we can adopt the method of piercing to keep the blank contour closed, reduce the stress and deformation in the process of processing, and avoid and reduce the deformation of the workpiece.
2. Multiple Cutting
When processing parts with high precision, the multi-cutting method can be used to make the large gantry milling process meet the accuracy requirements of the parts.
3. Stress Removal
Before large gantry milling, heat treatment is preferred to eliminate the internal stress of materials, so that the stress and deformation of WEDM machine tools can be reduced and the size of materials can be stabilized.
When cutting aluminium parts, we can adjust the position of upper and lower wire racks and conductive blocks to prevent wire breakage easily. Now large gantry milling machine tools are equipped with aluminium cutting device, which is usually more convenient.