Things to keep in mind when CNC machining aluminum parts

Aluminum precision parts and product technology are popular for their light weight and exquisite appearance, and are widely used in industry and daily necessities. With the continuous progress of science and technology, people's demand for product diversity is getting stronger and stronger. Therefore, the process of aluminum alloy products can be more and more demanding, and the market demand is also higher and higher.cnc aluminum parts In order to meet people's demand for aluminum alloy shell product diversity and high quality, aluminum alloy CNC machining manufacturer summarizes the process skills ability in the process of machining and processing, as well as aluminum CNC machining process need to pay attention to the problem.

1. Select the appropriate processing method

CNC machine cutting is a streamlined cutting processing method and a common process for aluminum precision machining. The use of end mills has multi-directional cutting capabilities, helical cutting interpolation, and contour cutting interpolation.aluminum t profile Process fewer holes with fewer tools.

2. Ball end mills can be used with helical interpolation for continuous machining of tapered holes

Ball end mills and helical interpolation drills can be used for drilling and chamfering. End mills can be used with contour cutting interpolation for semi-finishing of holes and machining of precision parts.led panel aluminum frame End mills for threading can be used with helical interpolation to machine a wide range of threaded holes.

Highly efficient aluminum alloy precision parts can be machined in a variety of precision holes of different sizes using tool interpolation. The load on each tooth is relatively light, especially when using high-speed milling machines. Therefore, the same coated carbide end mill can be used for a variety of processing technology material aspects of high-speed high-precision drilling.

3. Choose the right amount of cutting

Workers can choose the cutting speed used according to the material being processed, hardness, cutting conditions, material type and depth of cut. These conditions are necessary to effectively reduce machine wear.

4. Select the right tool.

Front Angle:The front angle should be correctly selected while maintaining the strength of the cutting edge. One side can sharpen the cutting edge, reduce cutting deformation, discharge chips more smoothly, and reduce cutting resistance and cutting heat. Never use a tool with a negative rake angle.

Back Angle: The size of the back angle directly affects the wear of the back angle surface and the quality of the machined surface. Cutting thickness is an important basis for selecting the back angle. When roughing, the feed is large, the cutting load is large and the heat is high, so the tool is required to have good heat dissipation conditions. Therefore, you should choose a smaller back angle. When finishing on a milling machine, you need to sharpen the edges, reduce the friction between the back tool face and the machined surface, and reduce the elastic deformation. Therefore, you should choose a larger back angle.

Helix angle:The helix angle should be as large as possible to make the milling machine smooth and reduce the force on the milling machine.

Approach angle:Appropriate reduction of the approach angle can effectively improve the heat dissipation conditions and reduce the average temperature of the treatment area.

Reduce the number of milling teeth to increase the chip removal space.

Due to the large plasticity of aluminum alloy material, large cutting deformation, large chip removal clearance, the bottom radius of chip clamping slot must be large, and the number of milling teeth must be small.

Precision grinding of the teeth: The roughness value of the tooth edges should be less than ra = 0.4 μm. Before using a new cutter, the front and back sides should be gently polished with a pebble in order to remove burrs or slight serrations left by the grinding process. This not only reduces the cutting heat, but also the cutting deformation is relatively small.

Strictly control the tool wear standard. With tool wear, the surface roughness of the workpiece increases, the cutting temperature rises, and the workpiece deformation increases. Therefore, in addition to selecting tool materials with good abrasion resistance, the wear standard should not exceed 0.2 mm, otherwise it is easy to produce chip tumors. Cutting, the workpiece temperature should generally not exceed 100 ℃ to prevent deformation.

5. Choose a reasonable fixture.

Parts must fully meet the needs of the machine to reduce unnecessary positioning system errors, and should choose a special clamp tool.

6. Determine a reasonable machining route.

Try to keep the machining route as short as possible to minimize machine wear.

In high-speed cutting, the machining allowance is large, the cutting is intermittent, so the milling machine processing will produce vibration, affecting the accuracy and surface roughness. Therefore, CNC high-speed machining can generally be divided into roughing-semi-finishing, gap machining, finishing and other processes.

For parts requiring high precision, a second semi-finishing process may be required before finishing. After rough machining, the parts are naturally cooled to eliminate internal stresses and reduce deformation. The margin left after rough machining should be larger than the deformation (generally 1-2mm). In the finishing process, the finishing surface of the part should maintain a uniform machining tolerance. 0.2-0.5mm is generally good. This keeps the tool stable during machining and significantly reduces cutting deformation. Obtain good surface finish quality and ensure product accuracy.