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Operational techniques to reduce the deformation of aluminum parts

Admin: MXG Date: 2024-02-06

1.For parts with large machining allowance,in order to make them have better heat dissipation conditions during aluminum processing,avoid heat concentration,and symmetrical processing should be used during processing.If a piece of 90 mm thick sheet needs to be machined to 60 mm,if the other side is milled and the other side is milled,the flatness is 5 mm at one time.If it is processed by repeated infeed,each side is divided into two.Secondary processing to the final size to ensure a flatness of 0.3 mm

2.If there are multiple cavities on the plate parts,it is not advisable to use a cavity and a cavity order processing method during processing,which is easy to cause deformation of the parts due to uneven force.Multi-layer processing is used,each layer is processed into all the cavities at the same time,and then the next layer is processed to make the parts evenly stressed and reduce the deformation.

3.Reduce the cutting force and heat by changing the amount of cutting.Among the three factors of cutting amount,the amount of backing knife has a great influence on the cutting force.If the machining allowance is too large,the cutting force of one pass will be too large,which will not only deform the parts,but also affect the rigidity of the machine spindle and reduce the durability of the tool.If you reduce the amount of back-to-back knives,it will greatly reduce production efficiency.However,high-speed milling in CNC machining can overcome this problem.While reducing the amount of back-feeding,as long as the feed is increased accordingly and the speed of the machine tool is increased,the cutting force can be reduced and the machining efficiency can be ensured.

4.The order of the knife must also pay attention to.Roughing emphasizes the improvement of processing efficiency and the pursuit of resection rate per unit time.Generally,up-cut milling can be used.That is to remove the excess material on the surface of the blank at the fastest speed and in the shortest time,basically forming the geometric contour required for finishing.The finishing work emphasizes high precision and high quality,and it is recommended to use down milling.Because the cutting thickness of the cutters gradually decreases from the maximum to zero during the milling,the degree of work hardening is greatly reduced,and the degree of deformation of the parts is alleviated.

5.Thin-walled workpieces are deformed due to the clamping during processing,even finishing is difficult to avoid.In order to minimize the deformation of the workpiece,the pressing piece can be loosened before the finishing is reached to the final size,so that the workpiece can be freely restored to its original shape,and then slightly pressed,just to clamp the workpiece.According to the feel,this can achieve the desired processing results.In short,the point of application of the clamping force is preferably on the bearing surface,and the clamping force should be applied to the direction of the rigidity of the workpiece.Under the premise of ensuring that the workpiece is not loose,the clamping force is as small as possible.

6.When processing the cavity parts,when processing the cavity,try not to let the milling cutter directly into the part like a drill bit,resulting in insufficient space of the milling cutter chip,the chip removal is not smooth,causing overheating,expansion and collapse of the parts.Unfavorable phenomena such as knives and broken knives.First drill the hole with a drill of the same size or larger size as the milling cutter,and then mill with a milling cutter.Alternatively,the CAM software can be used to produce a spiral undercut program.

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