Custom Metal Machining Precision Aluminum Parts CNC Machining Mechanical Parts

Aluminum alloy CNC processing principle:

Aluminum alloy CNC machining principle is to use the automatic control system to install digital program flow command control CNC machine tool bearing automatic start and stop, reversing and speed change can select CNC blade and according to the CNC blade to change the amount of cutting and walking trajectory to complete the life processing of various auxiliary action required.

Aluminum alloy CNC processing advantages:

1. Aluminum alloy CNC processing can reduce the total number of tooling in large quantities, production, and processing of complicated parts, only need to change the processing procedure flow.

2. Aluminum alloy CNC processing is relatively stable, and will not let the human processing deviation, resulting in each aluminum alloy is not the same, even defective products.

3. CNC processing of aluminum alloy can produce complex aluminum parts, and even production and processing parts. Can also produce a variety of varieties, high production efficiency, save labor costs, and can realize a variety of products at the same time.

Operation skills for reducing deformation of aluminum parts

In addition to the above reasons, the operation method is also very important in the actual operation.

1. For parts with a large machining allowance, to provide better heat dissipation conditions and avoid heat concentration during machining, symmetrical machining should be adopted. If a 90mm thick plate needs to be processed to 60mm, if one side is milled and the other side is milled immediately and processed to the final size at one time, the flatness will reach 5mm; If repeated feed symmetrical machining is adopted, each side is processed twice to the final dimension, and the flatness can be guaranteed to reach 0.3mm.

2. If there are multiple cavities on the plate part, the sequential processing method of one cavity and one cavity should not be adopted during processing, which is easy to cause uneven stress on the part and deformation. The multi-layer processing is adopted, and each layer is processed to all cavities at the same time as possible, and then the next layer is processed so that the parts are uniformly stressed and the deformation is reduced.

3. Cutting force and cutting heat can be reduced by changing cutting parameters. Among the three elements of cutting parameters, the backdraft has a great influence on the cutting force. If the machining allowance is too large and the cutting force of the tool is too large, it will not only deform the parts but also affect the rigidity of the machine tool spindle and reduce the durability of the tool. If you reduce the number of back knives, the production efficiency will be greatly reduced. However, high-speed milling can overcome this problem in NC machining. While reducing the backdraft, as long as the feed is correspondingly increased and the rotation speed of the machine tool is increased, the cutting force can be reduced and the machining efficiency can be ensured.

4. Pay attention to the order of cutting. Rough machining emphasizes the improvement of machining efficiency and the pursuit of cutting rate per unit time. Generally, reverse milling can be used. That is, the excess material on the surface of the blank is cut off at the fastest speed and in the shortest time to form the geometric profile required for finishing. While finishing emphasizes high precision and high quality, it is appropriate to adopt forward milling. Because the cutting thickness of the cutter teeth gradually decreases from the maximum to zero during down milling, the work hardening degree is greatly reduced and the deformation degree of the parts is reduced.

5. It is difficult to avoid the deformation of thin-walled workpieces due to clamping during machining, even when finishing. To reduce the deformation of the workpiece to the minimum, before the finishing machining reaches the final size, loosen the pressing part to make the workpiece freely return to the original state, and then slightly press it, subject to the workpiece being clamped (completely by hand), to obtain the ideal processing effect. In short, the action point of the clamping force should be on the bearing surface, and the clamping force should act in the direction with good rigidity of the workpiece. On the premise of ensuring that the workpiece is not loose, the smaller the clamping force, the better.

6. When processing parts with cavities, try not to let the milling cutter directly plunge into the parts like a drill bit when processing the cavities, resulting in insufficient chip space for the milling cutter, unsmooth chip discharge, overheating, expansion of the parts, tool breakage, and other adverse phenomena. First, drill the cutter hole with a drill of the same size or larger than the milling cutter, and then mill with a milling cutter. Alternatively, the spiral cutting program can be produced with CAM software.