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How To Solve The Difficulty Of Aluminum Alloy Parts Machining
Apr 18, 2018

How to solve the difficulty of aluminum alloy parts machining

On the difficulty of aluminum alloy parts machining how to solve this problem, I believe that many friends in the machining industry want to know, to help everyone solve this problem, the following NOBLE smart manufacturing technology summarizes some of the past experience, to everyone A simple description.

Difficulties in the machining of aluminum alloy parts sometimes make our operators particularly helpless. Here we will introduce the machining of aluminum alloy thin-wall parts as an example.

In the machining process, due to the influence of deformation on the size and shape and position tolerance of parts, high-speed, low-infeed, and low-cut-depth machining methods are used to complete the machining of all the parts' associated dimensions in one setup, thereby reducing the parts during machining. The deformation caused by the excessive cutting force avoids the error caused by the inconsistency between the machining reference and the design reference, and improves the dimensional accuracy and shape accuracy of the part.

1, the question is raised:

In the mechanical machining of parts, deformation is often caused by internal stress, especially the machining of colored light metals such as aluminum and magnesium alloys. The warpage, lateral bending and twisting caused by internal stress frequently occur in the form of deformation, which will seriously affect the machining quality and machining efficiency of parts, especially for thin-walled and thin-plate parts. How to minimize or eliminate the deformation of parts and ensure product quality and production efficiency has been the subject of our research for many years.

2. Reason analysis:

In order to improve the machining and use properties of aluminum alloys, it is necessary to increase the strength by heat treatment (quenching treatment + aging treatment) before machining. The material generates a large internal stress during the quenching process, and the aging process cannot completely release the internal stress generated during the quenching process.

In the subsequent machining process, a new cutting stress is generated. As the material is continuously removed, the equilibrium state of the internal stress is broken and the internal stress is redistributed until the new equilibrium process is reached and deformation occurs, causing the part to lose its proper machining precision. And when the stress on the surface of the part exceeds the strength limit of the material, cracks can also occur.

3, the solution:

For the above reasons, the aluminum alloy thin-walled and thin-plate parts are processed using the "kit" method. The "kit" method is a machining method in which all parts are machined at a time and then the parts are pulled out of the workblank.

Since the entire process is completed in a single clamping, the part is connected to the bottom surface of the workblank prior to cutting. Therefore, the generation of internal stress does not cause large deformation of the part, and the part dimensions are stable throughout the entire process.

In the cutting, the workblank material and the material of the part need to be adhered to the bottom surface with 0.1 mm, so as to ensure that the part has enough strength during the entire “package” process to resist the cutting stress generated during the machining.

After the part is cut from the workblank, although the part is deformed due to stress release, the relative sizes on the part do not change. Only the calibration process needs to be added to correct the bottom surface. All dimensions and shapes can be restored correctly.

By Nicole