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Cooperate With Strong Magnets To Help Clamp Thin Plate Milling
Nov 24, 2018

Cooperate with strong magnets to help clamp thin plate milling


Clamping is an important part of machining. For CNC milling of thin aluminum and thin copper parts, if the clamping method is improper, it will result in insufficient holding force or deformation of the parts. After research and practice,


The use of magnet-assisted clamping can effectively solve this problem.


Defects of traditional clamping methods for thin-plate parts


When processing thin-plate parts, the traditional method of clamping is to use a combination of pliers, horns and iron. Due to the thin thickness of the middle part of the part, and the high plasticity of the material and the low tensile strength, the clamping deformation is very likely to occur.


When the clamping force is too large, the billet will be raised in the middle, and the processed parts will be thick on both sides and thin in the middle; when the clamping force is insufficient, the parts will be displaced, affecting the processing precision and even causing the parts to be scrapped. Therefore, the clamping force must be just right.

Vacuum adsorption is also a viable clamping method with high clamping accuracy. However, such fixtures are also costly, and are also affected by CNC machining fluids, causing damage, and are therefore not ideal for clamping.


Analysis of strong magnet clamping method


A strong magnetic NdFeB magnet is used as an auxiliary clamping device to clamp thin plate parts. The neodymium iron boron magnet is the strongest permanent magnet of the magnetic force, and can absorb the weight equivalent to 640 times its own weight, especially suitable for the clamping of small volume and large magnetic force.

When clamping, the middle position of the thin plate is placed according to the actual situation, and the strong magnet of appropriate size and quantity is matched with the flat pliers, the iron and the horn, and the horn is adsorbed to firmly adhere to the thin plate workpiece without generating Uplift. This type of clamping can not only


Provides sufficient clamping force and is not prone to clamping deformation.


After comparison, the processing is performed by means of magnet-assisted clamping, and the thickness tolerance of the workpiece is about 90% lower than that of the workpiece processed by the ordinary clamping method, and the machining accuracy of the part is significantly improved.

Strong magnet clamping precautions


When using a strong magnet to assist in the clamping method, there are several problems that require special attention:


First of all, when using the iron-clamping clamp, it is necessary to first process the periphery of the thin plate and then machine the intermediate part, so that the clamping precision of the extruded iron can be effectively ensured.

Secondly, since the accuracy of the horn and the pliers directly affects the machining accuracy of the workpiece, the flatness must generally be higher than the accuracy of the workpiece. In general, flat jaws and horns have the highest flatness if the workpiece requires a machining accuracy of 0.05 mm.


Can not exceed 0.02 mm.

Next, it should be noted that the distribution of strong magnets does not have a certain rule, and can be flexibly arranged according to the actual processing conditions. The magnets can be placed according to the size of the part and the processing position, and multiple magnets of different sizes can be placed to ensure that the sheet is in close contact with the horn. necessary

At the time, it is possible to pause during the machining process, and then adjust the position of the magnet before performing the subsequent processing.

Then pay attention to the influence of the magnet on the tool, especially for milling cutters with very small diameters or long suspensions. It is necessary to make the processing path of the magnet's position prevention principle.

Finally, it should be noted that when the tool is milled, a certain lifting force is generated, which affects the firmness of the clamping. Therefore, it is necessary to analyze the milling force of the tool according to the milling depth of the thin plate processing, and whether the clamping force is exceeded. When necessary,


Small-diameter end mills, small spiral angle cutters, layered milling and reduced width can be used to reduce the cutting force.