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Working principle of slow wire processing

 Slow wire walking, also called low-speed wire walking, is a kind of CNC machining machine tool that uses continuously moving fine metal wire as an electrode to pulse spark discharge on the workpiece to generate a high temperature of over 6000 degrees, ablate metal and cut into a workpiece. The principle of wire processing is the phenomenon that there is a gap between the wire electrode and the workpiece, and the metal is removed by continuous discharge. Since the slow-moving wire cutting machine adopts the method of wire electrode continuous feeding, that is, the wire electrode is processed during the movement, so even if the wire electrode is worn out, it can be continuously supplemented, so it can improve the machining accuracy of the parts and slow the wire. The surface roughness of the workpiece processed by the cutting machine can usually reach Ra=0.8μm and above, and the roundness error, linear error and dimensional error of the slow-moving wire cutting machine are much better t

Classification of CNC Machining Occupation Levels

1. Blue-collar layer:   That is, CNC machining operation technicians, proficient in machining and CNC machining process knowledge, proficient in the operation and manual programming of CNC machine tools (attributes: automated machine tools), understand automatic programming and simple maintenance of CNC machine tools (attributes: automated machine tools), such There is a large market demand for personnel, and they are suitable for operating workers of CNC machine tools (attributes: automated machine tools) in the workshop, but due to their single knowledge, their wages will not be much higher.   2. Gray collar layer:   One, CNC machining programmer:   Master the knowledge of 5 Axis CNC machining Aluminum   technology and the operation of CNC machine tools (attributes: automated machine tools), be familiar with the design and manufacturing expertise of complex molds (title: mother of industry), and be proficient in 3D CAD/CAM software, such as UG, GOOGLE PRO/E, etc. ; Familiar with CNC

Elimination of Gear Backlash in CNC Machining Feed System

Elimination of Gear Backlash in CNC Machining Feed System   The transmission gear in the feed system of the CNC machining machine tool must eliminate the transmission gap between the meshing gears as much as possible, otherwise the motion will lag behind the command signal after each reversal of the feed system, which will affect the machining accuracy (accuracy) ). There are the following two common methods for CNC machining machine tools to eliminate the transmission gear gap.   1. Rigidity adjustment method   The rigid adjustment method is an adjustment method that cannot be automatically compensated for the tooth side clearance after adjustment. Therefore, the pitch tolerance and tooth thickness of the gear must be strictly controlled, otherwise the flexibility of the transmission will be affected. This adjustment method has a relatively simple structure and a better transmission rigidity.   (1) Eccentric shaft adjustment method   As shown in Figure 610, the gear 1 is mounted on th

What are the main causes of errors in the machining of mechanical parts?


Machining accuracy refers to the degree of conformity between the actual geometric parameters (size, shape and position) of the mechanical parts after machining and the ideal geometric parameters. In the machining of mechanical parts, errors are inevitable, but the errors must be within the allowable range. Passing errors Analyze and master the basic laws of its changes, so as to take corresponding measures to reduce machining errors and improve machining accuracy.

  • 1. Spindle rotation error. Spindle rotation error refers to the variation of the actual rotation axis of the spindle relative to its average rotation axis at each moment. The main reasons for the radial rotation error of the spindle are: the coaxiality error of the spindle journals and bearings Various errors in itself, coaxiality errors between bearings, spindle deflection, etc.
  • 2. Guide rail error. The guide rail is the benchmark for determining the relative position relationship of the machine tool components on the machine tool, and also the benchmark for machine tool movement. The uneven wear and installation quality of the guide rail are also important factors that cause the guide rail error.
  • 3. Transmission chain error. The transmission error of the transmission chain refers to the error of the relative movement between the first and last ends of the transmission chain in the internal connection. The transmission error is caused by the manufacturing and assembly errors and the use process of each component of the transmission chain. Caused by wear and tear.
  • 4. The geometric error of the tool. Any tool will inevitably be worn during the cutting process, and this will cause the size and shape of the workpiece to change.
  • 5. Positioning error. The first is the error that the reference does not coincide. The reference used to determine the size and position of a certain surface on the part drawing is called the design reference. It is used on the process drawing to determine the size of the processed surface of the process The datum on which the position is based is called the process datum. When processing the workpiece on the machine tool, several geometric elements on the workpiece need to be selected as the positioning datum during processing. If the selected positioning datum does not coincide with the design datum, a datum will be generated. Non-coincidence error. The second is the inaccurate error of positioning pair manufacturing.
  • 6. The error caused by the force deformation of the process system. The first is the rigidity of the workpiece. In the process system, if the rigidity of the workpiece is relatively low relative to the machine tool, tool, and fixture, under the action of the cutting force, the deformation of the workpiece due to insufficient rigidity is The impact of machining accuracy is relatively large. The second is tool rigidity. The rigidity of the external turning tool in the normal direction of the machining surface is very large, and its deformation can be ignored. Boring an inner hole with a small diameter, the rigidity of the tool bar is very poor, The force and deformation of the rod have a great influence on the accuracy of hole machining. The third is the stiffness of machine tool components. The machine tool components are composed of many parts. There is no suitable simple calculation method for the stiffness of machine tools. At present, experimental methods are mainly used to determine the stiffness of machine tools.
  • 7. Errors caused by thermal deformation of the process system. The thermal deformation of the process system has a relatively large impact on the machining accuracy, especially in precision machining and large-scale processing. The machining error caused by thermal deformation can sometimes account for 50% of the total error of the workpiece. .
  • 8. Adjustment error. In each process of machining, the process system must be adjusted in one way or another. Since the adjustment cannot be absolutely accurate, adjustment errors occur. In the process system, the workpiece and the tool are in the machine tool The mutual position accuracy of the above is ensured by adjusting the machine tool, tool, fixture or workpiece. When the original accuracy of the machine tool, tool, fixture and workpiece blank meets the process requirements without considering dynamic factors, the influence of adjustment error , Plays a decisive role in processing accuracy.
  • 9. Measurement error. When measuring mechanical parts during processing or after processing, the measurement accuracy is directly affected by the measurement method, the accuracy of the measuring tool, the workpiece and the subjective and objective factors.

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