【Illustration】Why do aluminum alloy processing need surface treatment? Common understandings of aluminum profile processing

Many people have some understanding of our Shenzhen parts processing, etc., and also introduced auto parts processing to everyone, and today I will introduce to you "Why aluminum alloy processing needs surface treatment, common understanding of aluminum profile processing" Misunderstanding", I hope it can help everyone.

Aluminum is a light metal with silver-white luster, and its corrosion resistance has the following two characteristics:

1. The higher the purity, the better the corrosion resistance. As we all know, pure aluminum reacts with oxygen in the air to produce a thin and dense natural oxide film on the surface of aluminum, which is faster and faster than other metal oxide films. It is much thicker, which prevents the corrosion of harmful gases and moisture in the air and plays a protective role;

2. Although pure aluminum has good corrosion resistance, it has poor mechanical strength, which restricts the application of aluminum to a certain extent. Therefore, people add appropriate amounts of magnesium, copper, zinc and other metals to aluminum to make various types The mechanical strength of aluminum alloy is high, which greatly improves the mechanical strength of aluminum, and the application range is greatly expanded. Although aluminum alloy has high mechanical strength, its corrosion resistance is worse than that of pure aluminum, so it may be corroded due to oxidation. This requires powder coating to protect aluminum alloy profiles. Aluminum alloys have been widely used in building doors, windows, curtain walls and other products for many years because of their small specific gravity, easy processing, and high mechanical strength. ,

Therefore, in the process of aluminum alloy processing, the surface treatment of aluminum materials is carried out. Aluminum profiles have many advantages such as high corrosion resistance, diversified colors, and good surface texture. They correspond to different architectural exterior wall coatings. Why is aluminum alloy processed? Surface treatment is required to create colorful buildings.

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1) Fast forward and work advance

In the aluminum profile processing program, G00 and G01 can define the linear motion of the tool, but their functions are very different, and beginners are easy to confuse.

The feedrate of work-feeding commands (G01, G02, G03, etc.) is determined by the F command in the program; the feedrates of fast-forwarding commands (G00 and part of the zero return command) are not specified in the machining program, but when setting the machine parameters It is saved in the CNC system as machine parameters.

Work advance instructions not only must ensure the accuracy of the processing end point, but also the accuracy of the processing path and feed rate. This is achieved by microscopic interpolation calculations and dynamic control. The purpose of fast forward instructions is to minimize the idle travel time. When multi-axis linkage, the motion trajectory is unpredictable. Therefore, fast forward instructions cannot be used for processing feeds.

2) Positioning accuracy and repeated positioning accuracy

Machining center manufacturers often only give repeated positioning accuracy but not positioning accuracy indicators in promotional materials, which makes some users accept the common misunderstanding of aluminum alloy aluminum profile processing and misunderstand the repeated positioning accuracy as the main indicator that determines the machining accuracy of parts. . In fact, high repeat positioning accuracy does not mean high parts processing accuracy. Positioning accuracy is the main indicator that determines the machining accuracy of parts. Repeated positioning accuracy reflects the ability of the machine tool to return to the same position multiple times. The measuring method is to fix a dial indicator, press the head of the indicator on the main shaft, and calibrate the dial indicator zero point. Move the main shaft to any position and then return it to the calibrated coordinate position just now, and read the error of the dial indicator. After multiple round-trip readings, the maximum error obtained is the repeat positioning accuracy. According to the current level of numerical control technology and the typical mechanical and electrical matching of machining centers, that is, servo motor, rotary encoder, ball screw or rack and pinion repeated positioning error is generally not more than 2 pulse equivalent, far less than 0.01mm.

Positioning accuracy refers to the ability to accurately move a specified distance on the full stroke of the machine tool. The maximum stroke of the aluminum profile processing center can reach 7 meters, and the positioning accuracy measurement generally uses laser interference

Instrument. The positioning accuracy is mainly affected by the guide rail shape and position error, mechanical clearance, screw/rack error, mechanical deformation and electrical following error. The error data measured by the laser interferometer is input into the numerical control system, and high positioning accuracy can be obtained through the error compensation function of the numerical control system.

“Why do aluminum alloy processing require surface treatment, common misunderstandings in aluminum profile processing” and another article Shenzhen Parts Processing will provide you with some help. We will carefully prepare more details about why aluminum alloy processing needs surface treatment in the follow-up. If you don’t want to miss it, bookmark our website!

Keywords in this article: machining aluminum alloy precision positioning error instruction