Aluminum parts processing difficulties how to solve?
On the
aluminum alloy parts processing difficulties how to solve this problem, I believe that many people engaged in the
machining industry friends want to know, to help you solve this problem, the following Xiaobian summed up some of the past experience, to give you a simple Of the narrative: non-standard parts processing
Aluminum alloy parts processing difficulties sometimes make our operators particularly helpless, the following to aluminum alloy thin-walled parts processing as an example for everyone to introduce:
In the machining process due to the deformation of the parts of the size, shape and position of the problem of tolerance to high speed, low feed, low cutting depth of the processing method, through a clamping all parts of the associated size of the processing, thereby reducing the parts in the process Deformation caused by excessive cutting force, to avoid the processing of the benchmark and the design of the benchmark can not coincide with the error, improve the dimensional accuracy of parts and shape and position accuracy.
1, the question raised:
In the mechanical processing of parts, often due to internal stress and deformation, especially colored light metals such as aluminum, magnesium alloy processing. Internal stress caused by warping, bending and twisting and other forms of deformation occur frequently, will seriously affect the processing of parts quality and processing efficiency, especially for thin-walled, thin sheet parts are particularly prominent. How to minimize or eliminate the deformation of parts to ensure product quality and production efficiency, over the years has been our research topic.
2, the reasons for analysis:
In order to improve the processing and use of aluminum alloy, before processing through the heat treatment (quenching + aging treatment) approach to improve the strength. The material produces a large internal stress during the quenching process, and the aging process can not completely release the internal stress generated during the quenching process.
In the subsequent machining process, the new cutting stress is generated, and as the material is continuously removed, the equilibrium state of the internal stress is broken and the internal stress is redistributed until a new equilibrium process is achieved and the parts are lost due to the processing Accuracy. And when the part of the surface stress exceeds the strength limit of the material, it will produce cracks.
3, the solution:
For the above reasons, for the aluminum thin-walled, thin plate parts using "casing" method for processing. "Set material" method is a clamping to complete all the size of processing, and then parts from the rough out of the processing method.
The process includes the milling of the above → rough milling cavity → rough milling shape → fine milling shape → fine milling cavity → finishing bottom → point (drilling) hole → cutting and other processes.
Since the entire process is done in a single clamping, the internal stress does not cause a large deformation of the part due to the fact that the part is connected to the bottom of the blank material before cutting, and the part size is stable throughout the process.
At the time of cutting, the blank material and the part material are allowed to have a 0.1 mm adhesion on the bottom to ensure that the parts have sufficient strength to resist the cutting stress generated during the entire process. Non-standard parts processing
After the parts are cut from the blank, the parts are deformed due to the stress release, but the relative dimensions on the parts do not change, and only the calibration process needs to be increased. All dimensions and shapes can be restored correctly.
