[Experience] Misunderstanding of aluminum profile processing How to reduce defective products in aluminum alloy processing

Aluminum alloy processing factory company is a professional copier parts processing, aluminum alloy processing factory company, today our experts will bring you “a misunderstanding of aluminum profile processing how to reduce defective products in aluminum alloy processing”, We hope that through our introduction, you will have a deeper understanding of how to reduce defective products in aluminum alloy processing.

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 repeat positioning accuracy but not positioning accuracy indicators in promotional materials, which makes it easy for some users to misunderstand repeat 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 for processing, and the misunderstanding of aluminum profile processing can obtain high positioning accuracy through the error compensation function of the numerical control system.

Welcome to read: The essentials and precautions for the operation of CNC machine tools

Under the current situation, whether it is for automobiles, mechanical protection, and railways, the demand for industrial aluminum profiles is increasing. This naturally thinks of the dual problems of cost and resource utilization. Therefore, how to improve the yield of industrial aluminum profiles has become a top priority and measures to increase productivity. Many, this article mainly talks about two measures that are relatively more specific and practical.

1. Advanced equipment and high-quality workers are the prerequisites for increasing output

To increase the output of extrusion products, advanced equipment, high-quality workers, and modern scientific management play a vital role. Among the more than 2500 industrial aluminum extrusion presses in our country, only about 25 are up to the international level, or about 1%. my country's aluminum extrusion industry is in the stage of structural adjustment, and low-level duplication should be avoided. Introducing and constructing, it is better to transform the existing industrial aluminum extrusion press with value into modern high-level industrial aluminum extrusion press.

2. The relationship between temperature control and increased output

Generally, if there is no unscheduled downtime, the maximum output is mainly determined by the extrusion speed, and the latter is subject to four factors, three of which are fixed and the other is variable. The first factor is the extrusion force of the industrial aluminum profile extruder. The larger extrusion force can be smoothly extruded when the ingot temperature is low; the second factor is the die design, the metal and the die wall during extrusion Friction can usually increase the temperature of the passing aluminum alloy by 35～62℃; the third factor is the characteristics of the alloy being extruded, which is an uncontrollable factor that limits the extrusion speed. The exit temperature of the profile should generally not exceed 540℃, otherwise , The surface quality of the material will be reduced, the mold marks will be significantly heavier, and even aluminum sticking, gravure, micro cracks, tearing, etc. will appear. The last factor is temperature and its degree of control.

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