The application of coal technology cutting technology in the surface quality of coal mine machine equipment parts Wang Xiaoxiang, Weierbin University of Technology, Harbin 150000, and a series of advantages such as improving processing speed and processing flexibility, has many applications in industry. Firstly, the paper outlines the principle and characteristics of wire cutting technology. It discusses the application of wire cutting technology in coal mine machinery parts by fast wire cutting and rotating surface machining. Then it analyzes the application of wire cutting technology in the surface quality control of coal mine machinery parts. .
0 刖In the quality control of coal mine machinery and equipment parts, the existing cutting technology mainly includes laser cutting, electric spark cutting, plasma cutting, wire cutting, flame cutting and so on. In this paper, the application effect of wire cutting technology in the surface quality control of coal mine machinery and equipment parts is discussed in detail.
The actual needs. With the continuous development of complex, precise and long-life mold technology, the processing equipment of many mold enterprises has been updated, and the equipment update in the field of coal industry in China has accelerated, which also promoted the rapid development of medium-speed wire EDM machine tools. .
The application of 2-wire cutting technology in coal mine machinery and equipment parts The principle and characteristics of 1 wire cutting technology 1.1 Principle of wire cutting technology During the processing, the electrode wire is connected to the negative pole of the power supply, and the workpiece is connected to the positive pole. The wire is unidirectional or reciprocating along its axial direction at a certain speed. The machine control system controls the workpiece to move in a set manner in the machining plane, and a spark pulse discharge between the wire and the workpiece etches away excess material, thereby completing the entire process. Processing process.
1.2 Characteristics of Wire Cutting Technology In the past, the surface of the medium speed wire EDM wire cutting machine will produce a “deteriorating layer†that affects the life of the die. Now the medium speed wire EDM machine has eliminated the “deterioration layer†and its surface precision and surface roughness. The degree has been able to meet the requirements of the mold, and as the grinding process can be used as the means of final processing of precision molds. Due to the series of advantages of the medium-speed wire EDM machine, the development trend of “cutting and grinding†is becoming more and more obvious. At present, the medium-speed wire EDM wire cutting machine has become an indispensable important equipment in the mold processing. It can meet the equipment renewal and replacement in use. 2.1 The overall structure of the EDM wire cutting machine structure is more precise, in order to ensure high-precision machining, Many technical measures have been taken to improve the accuracy of the host. Control temperature: The rice water temperature cooling device makes the internal temperature of the machine tool the same as the water temperature, which reduces the thermal deformation of the machine tool. Linear motor, high responsivity, precise positioning can achieve 0.1m equivalent control, no vibration, no noise, increase the discharge frequency, maintain stable discharge, the specific composition is shown.
The hardware structure of the fast wire cutting rotary surface machining. Base 2. Workbench 3. Rotating spindle 4. Power and control device for rotating spindle motor 5. Electrode wire 6. Guide wheel 7. Storage tube 2.2 Cutting machine hardware Fast wire EDM wire cutting machine by coordinate table, bed Body, pulse power supply, wire movement system, working fluid circulation system, etc.
The bed part of the bed is made up of a wire-loading mechanism, a coordinate table and a wire frame.
The coordinate workbench part coordinate table is mainly composed of four parts: the carriage, the guide rail, the screw movement pair, the gear pair or the worm gear transmission pair. The carriage is mainly composed of a lower carriage, a middle carriage, an upper carriage and a workbench. The longitudinal and horizontal carriages of the coordinate table are reciprocated along the guide rails. Therefore, there is a high requirement for the accuracy, rigidity and wear resistance of the guide rail. In addition, the guide rails should make the carriage movement flexible and stable. Rolling guides are often used for wire cutting machines. The function of the screw drive pair is to change the rotational motion of the drive motor into a linear displacement of the carriage. In order to make the lead screw drive accurate, the lead screw and nut should be accurate, and should be guaranteed to be 6 or higher. The drive between the stepper motor and the lead screw is usually realized by a gear pair. Due to the influence of the flank clearance, the gap between the Shaft and the bearing, and the elastic deformation in the transmission chain, the transmission lost motion occurs when the driving gear on the stepping motor main shaft changes the transmission direction.
The main function of the wire movement system wire frame is to support the electrode wire when the wire wire moves at a given linear velocity. The wire frame wire-traveling mechanism and the guide wheel mechanism constitute the movement system of the wire electrode. Maintain a constant geometric angle between the plane of the wire table and the working part. The guide wheel is located at the end of the cantilever of the wire frame, and the wire frame supports the electrode wire through the guide wheel. The wire frame can be divided into fixed type, lift type and offset type according to functions, and can be divided into cantilever type and gantry type according to the structure.
2.2.4 Working fluid circulation system In the online cutting process, the working fluid system can be used to realize the electric spark wire cutting, and the working medium-working fluid with a certain insulating property can be used to cool the workpiece and the electrode wire to eliminate the influence of the electrolytic corrosion product. This will ensure the sustainable operation of the spark discharge.
2.2.5 Pulse power supply EDM wire cutting pulse power supply is the main component of CNC EDM wire cutting machine tool, usually called high frequency power supply, which is one of the important factors affecting the wire cutting process index. The wire-cut pulse power supply consists of a pulse generator, a push stage, a power amplifier and a DC power supply.
Application of 3-wire cutting technology in surface quality control of coal mine machinery and equipment parts 3.1 Graphic programming program First call gettfiledO function to create an NC file (the file has a .3B extension), then use ssgetG function to define the entity selection set (by the user The processing order is selected. After being smashed, it becomes two types of Line and Arc. (The research found that the v12.0 graphic entity is decomposed to the end and is Line and Arc. For example, the Fit fitted pline is Arc, spline. The fitted pline is broken and then line, etc.). So the core of the program is based on line and Arc. The program is transferred to the next entity to determine whether it is line or Arc. After the split, the geometric data is extracted according to the group code of line or Arc, and finally a string "BXXB YYBGZ is formed, and the character is added to the NC file, and then Then call an entity to perform a loop calculation, so that the NC file is incremented line by line until the entity is edited. For a line, the start and end coordinates can be extracted with 10 and 11 groups of codes, and then the origin is changed to the starting point. XX and YY are the coordinates of the end point. Let dxl and dx2 take the center, radius, starting angle and ending angle respectively.
3.2 Material erosion amount EDM wire cutting Rotating surface processing, the excess workpiece material is completely etched, so the amount of material erosion is the main method to measure the amount of processing. The amount of processing is determined by the size of the blank and the shape of the workpiece. The amount of material erosion is calculated by the volume of the etched material. 3.3 Processing Speed ​​In the normal wire cutting process, the machining speed is calculated by the cross-sectional area of ​​the workpiece swept by the wire per unit time. However, in the processing of the rotating surface, since the processing is performed by completely removing the excess material, the method of calculating the processing speed by the swept cross-sectional area is no longer applicable. Therefore, in the online cutting rotary surface machining, the processing speed is measured by the volume of the material etched per unit time.
3.4 Energy consumption analysis Because the machining current and pulse energy of the wire in the finishing section are very small, the wire loss of the finishing section and the electric etch pit of the surface are also very small, so that the surface of the wire can be maintained after a long time of processing. Very good roughness and roundness. The conventional machine tool roughing, semi-finishing, and finishing share a piece of electrode wire. It takes a long time to use the wire loss and the surface roughness changes greatly, which not only reduces the precision of the machined parts, but also deteriorates the degree of roughness. The cutting method compensates for the lack of filling of the conventional reciprocating wire cutting machine due to the long-term processing loss of the electrode wire, and the reduction of the precision of the workpiece and the surface roughness. The traditional reciprocating wire EDM machine has a running cost of only 10,000 to 15,000 a year, while the running cost of a slow wire requires 60,000 to 100,000 a year. The annual operating cost is about 1/6 of the slow wire. (Does not include electricity, staff, depreciation, etc.). However, the slow wire has the advantages of good processing roughness and high processing precision, which is impossible for the conventional fast wire machine.
4 Conclusion The current EDM wire cutting technology has been widely used in the field of coal processing. Since the wire cutting process has no macroscopic force and is not affected by the hardness of the workpiece material, it can process a variety of difficult-to-machine materials, complex surfaces and parts with special requirements. In this paper, the application of wire cutting technology in the surface quality control of coal mine machinery and equipment parts is analyzed. Finally, the line cutting and curve profiling of the workpiece is carried out by wire cutting technology, and good results are obtained.
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