Cnc grinding and precision machining of aerospace aluminum materials

As an aluminum alloy for precision grinding of aerospace aluminum materials, it is comparable to the strength of steel plates, but the density of aluminum alloys is only 1/3 of that of stainless steel. This lightweight, strong and tough aerospace grade metal is more than 3C industry at home and abroad. It is first used in the middle of the mobile phone to better protect the solidity and toughness of the fuselage. The workpiece is made by precision cutting and grinding with a CNC machine tool. The surface has been sandblasted. It is worth mentioning that the middle frame of both is made of aluminum-magnesium alloy. So how do you polish the precision aerospace aluminum material aluminum alloy?

Precision grinding and precision machining of aerospace aluminum materials.

Current precision and ultra-precision machining precisions range from micron to sub-micron, and even nano, and are widely used in automotive, home appliances, IT electronic information high-tech fields, and military and civilian industries. At the same time, the development of precision and ultra-precision machining technology has also promoted the development of machinery, molds, hydraulics, electronics, semiconductors, optics, sensors and measurement technology and metal processing industries.

Concepts and categories of precision and ultra-precision machining

Generally, machining is divided into three stages: general machining, precision machining, and ultra-precision machining. At present, precision machining means that the machining accuracy is 1~0. 1? ;m, surface roughness is Ra0. 1~0. 01? m processing technology, but this limit is constantly changing with the advancement of processing technology, today's precision machining may be the general processing of tomorrow.

The problems to be solved by precision machining are: machining accuracy, including geometrical tolerance, dimensional accuracy and surface condition; second, processing efficiency, some machining can achieve better machining accuracy, but it is difficult to achieve high machining efficiency. Precision machining includes micromachining, ultra-fine processing, finishing processing and other processing technologies. Traditional precision machining methods include abrasive belt grinding, precision cutting, honing, precision grinding and polishing.

1. Precision cutting, also known as diamond tool cutting (SPDT), is processed by high-precision machine tools and single crystal diamond tools. It is mainly used for precision machining of soft metals such as copper and aluminum, which are not suitable for grinding, such as magnetic for computers. Drums, magnetic disks and metal mirrors for high-power lasers are 1 to 2 grades higher than general cutting precision.
2. Honing, the honing head consisting of oil stone sand bar reciprocates along the surface of the workpiece under a certain pressure, and the surface roughness after processing can reach Ra0. 4~0. ;m, better to Ra0.025? ;m, mainly used for processing cast iron and steel, not suitable for processing non-ferrous metals with low hardness and good toughness.
3. The precision grinding of the abrasive belt is to grind the workpiece with the abrasive cloth with the abrasive. It belongs to the scope of the grinding of the coated abrasive. It has the characteristics of high productivity, good surface quality and wide application range.
4. Polishing is a kind of micro-machining of the surface of the workpiece by mechanical, chemical and electrochemical methods. It is mainly used to reduce the surface roughness of the workpiece. Commonly used methods are: manual or mechanical polishing, ultrasonic polishing, chemical polishing, electrochemical polishing and Electrochemical mechanical composite processing. After the manual or mechanical polishing process, the surface roughness Ra of the workpiece is ≤0.05. ;m, can be used for polishing of planes, cylinders, surfaces and mold cavities. Ultrasonic polishing processing accuracy of 0. 01 ~ 0. 02? ;m, surface roughness Ra0. 1? ;m. The surface roughness of chemical polishing is generally Ra ≤ 0. 2? ;m. Electrochemical polishing can be increased to Ra0.1~0.08? m.
5. Precision grinding and polishing through the abrasive and machining fluid between the workpiece and the tool, the workpiece and the lap are mechanically rubbed together to achieve the required size and precision of the workpiece. Precision grinding and polishing can achieve the precision and surface roughness that can not be achieved by other processing methods for metal and non-metal workpieces. The roughness of the surface to be polished is Ra≤0.025? ;m processing metamorphic layer is small, high surface quality, precision grinding equipment is simple, mainly used for processing of flat, cylindrical surface, gear tooth surface and sealing parts with sealing requirements, can also be used for gauges, gauge blocks, fuel injectors , the valve body and the valve core finishing
   

Ultra-precision machining is the processing of extremely high shape accuracy and surface finish on ultra-precision machine tools by using the strictly constrained relative motion generated between the part and the tool. The current ultra-precision machining means that the dimensional accuracy of the machined part is higher than 0.1 μm, the surface roughness Ra is less than 0.025 μm, and the resolution and repeatability of the machine tool positioning accuracy is higher than 0. 01 μm. It is a sub-micron processing technology and is developing into nanoscale processing technology.

Precision grinding and precision machining of super aerospace aluminum materials. Precision machining includes micromachining, ultra-fine machining, finishing, finishing and other processing technologies. Micro-machining technology refers to the processing technology for manufacturing small-sized parts; ultra-fine processing technology refers to the processing technology for manufacturing ultra-small-sized parts. They are proposed for the manufacturing requirements of integrated circuits. Due to the small size, the precision is cut off. The value of the dimension is expressed instead of the ratio of the processed dimension to the dimensional error. Finishing generally refers to a processing method that reduces the surface roughness and improves the mechanical properties of the surface layer. It does not focus on improving the processing accuracy. Typical processing methods include honing, grinding, super finishing and chipless processing. In fact, these processing methods not only improve the surface quality, but also improve the processing accuracy. Finishing is a new term that has been proposed in recent years. It corresponds to finishing, which means reducing the surface roughness and improving the mechanical properties of the surface layer, as well as improving the machining accuracy (including size, shape, Positioning accuracy).

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