Analysis of Factors Affecting Surface Roughness of Machining Parts

The factors affecting the surface roughness of the machined parts are as follows: (1) The transmission gap of the table is too large, and when the bevel or the arc surface is cut, the zigzag shape will be generated; 2 the axial displacement of the guide wheel, the roundness of the guide wheel is not qualified, and the center line of the guide wheel is not On one plane, the axial movement of the wire barrel will cause the plane of the workpiece to be uneven, and the electrode wire will produce a stripe every time it is reversed. 3 The electrical erosion rate and the feed rate are not suitable. If the feed rate is too slow, the impact feed will occur; if the feed speed is too fast, a serious short-circuit waveform will occur, accompanied by streaks; 4 external vibration or chip feeding into the processing area will cause short circuit, pause, etc., which will cause cracking. Irregular streaks are produced on the surface; the coolant is too dirty to be stable and will produce streaks; when the commutation is not turned off, the high frequency or the backlash of the storage tube will also cause convex or concave streaks.

The factors affecting the broken wire are as follows: 1 The output power of the high-frequency power supply is low or the power supply frequency is too high, the chip removal is difficult during the cutting process, and the original cutting piece is easy to break, even at the touch of a finger. In addition, the wiring outside the power supply and the poor grounding will cause the power output to drop due to the broken wire; the pulse width interval is not suitable for parameter adjustment and the wire breakage is easy to occur; 2 the coolant grade or the matching concentration is incorrect and the corrosion in the coolant Too much product, etc., all affect the service life of the wire; 3 the reason of the wire itself. Such as: the wire diameter is not properly selected or the quality is unqualified; 4 due to the internal stress of the material being cut, the material deformation during processing will cause the wire to jam and cause the broken wire; 5 mechanical aspects. For example, the sway of the storage tube is too large; the V-shaped groove of the guide wheel is seriously worn; the gap of the sapphire is small or the wear of the wire rod (conductive block) is severe, and the electrical contact is bad or the insulation is broken, etc., which will cause broken wire. In order to avoid broken wire, the operation sequence must be carried out according to the regulations: when starting, start the storage tube first, then start the cooling pump motor, and finally start the high-frequency power supply; when stopping, stop the high-frequency power supply first, then stop the cooling pump motor, and finally stop Wire storage motor. (Finish)