How many degrees of knives are used to process pure aluminum

When turning aluminum parts, you can use a large front angle chip groove of 12-16 degrees, but the width of the groove should be determined according to the cutting parameters, generally take 3-5mm degree part r for 3-4mm, and also need kerosene to cool and lubricate, and then with reasonable cutting parameters (cutting speed, depth and pass) can add bright and precise aluminum parts.

Processing this kind of material with low hardness and certain toughness, the entering angle of the tool has no effect, mainly because the angle of the rake face should be large, so that the tool is sharp and easy to cut the material. The chipbreaker should be easy to break, or the cutting edge should be made serrated to facilitate chip breaking. The cutting speed should be high, so that it is not easy to produce built-up edge.

If you choose a convertible insert, there are inserts that specialize in aluminium alloy, so you don't have to sharpen your own knives.

First of all, to correct the concept that there is no real pure aluminum in practical materials, and it is like there is no pure iron, which you are talking about in general called "soft aluminum". To know the geometric angle of the tool when turning, you must know the cutting performance of this type of material, which is characterized by the following characteristics: low hardness, good toughness and other characteristics. The surface is easy to tear, and it is not easy to reduce the surface roughness.

Therefore, the tool should be sharp, that is, the rake angle is large, it is best to have a chip breaker, the cutting speed is not easy to be high, and the processing is fully poured coolant.

There are carbide inserts that are specifically used for machining aluminum, and the rake angle of the blade is particularly large, and the rake corner finish is particularly shiny. It should be used to process aluminum without burrs and have a high finish. Aluminum processing characteristics; The material is soft, but it is relatively sticky, and it is easy to produce built-up edge compared to other materials such as steel.

Therefore, there are special requirements for processing aluminum alloys, and pure tungsten and cobalt carbide with fine grains is generally used, and there is no coating. The cutting edge is sharp and the surface is ground to achieve a low coefficient of friction, reduce the generation of built-up edge, and add kerosene to the cutting effect during processing.

When turning die-cast aluminum parts with diamond tools:

It should be high speed and low feed. Kerosene can be used as cutting fluid.

Rough turning, cutting speed is not more than 3000m min, feed.

Fine turning, cutting speed in 800 1400m min, feed due to cast aluminum strength and hardness is relatively low, plasticity is small, tool wear is small, is easy to process materials, with diamond tool processing is suitable for high-speed cutting. However, the melting point of aluminum alloy is low, the plasticity increases after the temperature increases, and under the action of high temperature and high pressure, the friction of the cutting interface is very large, and it is easy to stick to the tool. During machining, it is necessary to flexibly select the cutting speed according to the material in order to improve the finish of the workpiece.

Increase the number of workpiece revolutions and reduce the amount of feed.

Increase the rotational speed and reduce the feed.

What is the diameter of the inner circle? This is critical. The linear speed can be hit to 1000m min, according to v=3,14*n*d.

Finishing aluminum alloy can only use white steel cutters (that is, high-speed steel turning tools).

The best grades to choose are W18Cr4V, W6Mo5Cr4V2. Two types of high-speed steel as fine turning tools.

The white steel knife has the advantages of high heat dissipation, sharp cutting edge, and easy grinding edge. Its disadvantage is that the wear resistance is poor during use, and the cutting edge needs to be sharpened in time.

In addition, kerosene should be added as coolant to process aluminum alloy, which can greatly improve the surface finish of parts.

Aluminum alloy finishing pursues high precision and high finish, and the diamond (PCD) cutter is used for fine turning, which can achieve an almost mirror surface, because the PCD cutter has strong wear resistance in addition to its heat dissipation is also excellent, so the surface finish is high. If the machine tool is fine, the accuracy will naturally be high.

If you want to say that the roughness of the tool processing is good, it should be that the roughness of the high-speed steel tool is better than the roughness of the cemented carbide tool. Among the tungsten carbide tools, YG tools are suitable for processing non-ferrous metal materials. For example, yg6, yg8, yg6a, yg3x.

Domestic YT cemented carbide blades can be, imported ones are generally used for cutting steel parts, mainly the geometry of the blade should be sharp, and the front and rear angles should be larger.

1. Aluminum alloy has low hardness.

Compared to titanium alloys and quenched steels, aluminum alloys have a lower hardness, of course, heat treated, or die-cast aluminum alloys are also very hard. The HRC hardness of ordinary aluminum plate is generally below HRC 40 degrees. Therefore, when machining aluminum alloys, the load on the tool is small.

And because the thermal conductivity of aluminum alloy is better, the cutting temperature of milling aluminum alloy is relatively low, which can improve its milling speed.

2. Aluminum alloy has low plasticity.

Aluminum alloys have low plasticity and low melting points. When processing aluminum alloy, the problem of sticking knives is serious, the chip removal performance is poor, and the surface roughness is relatively high. In fact, the processing of aluminum alloy is mainly due to the poor effect of sticking knives and roughness.

As long as the two major problems of sticky knife and processing surface quality are solved, the problem of aluminum alloy processing will be solved.

3. The cutter is easy to wear.

Because of the use of unsuitable tool materials, when machining aluminum alloy, the tool wear is often accelerated due to problems such as sticking knives and chip removal.