|Title||China cuts off the disc to prevent the rupture of the cutting blank|
Reasonable arrangement of machining process1) The size of the wire-cut workpiece blank should be determined according to the size of the part, and should not be too small. In general, the pattern should be located in the middle of the blank or at a position far from the edge of the blank and not easily deformed. Usually, the pattern should be taken to the blank margin of more than 10 mm; 2) Where a large cavity or a narrow and complex punch is used, the traditional solid sheet habit is changed when preparing the blank. Large frame cavity, narrow and long cavity and other easily deformable parts, the middle part should be hollowed out. In this way, the condition in the surface is improved when quenching, the temperature difference is small, the generated stress is small, and the volume to be cut at the time of cutting is small, and the stress is balanced and not damaged; 3) In the case where the mold is allowed to use, China cut off disc the corner of the large frame-shaped cavity part should be appropriately increased, or the blanking point should be drilled before the line cutting to alleviate the phenomenon of stress concentration; 4) For the punched part, before the quenching, the threading hole of the starting point of the shape should be drilled in the bump blank, so that the workpiece maintains the internal stress balance and is not damaged during cutting, so as to avoid cracking deformation from the outside of the material.
Optimize the process plan of wire cutting and select reasonable process parameters1) The traditional habit of changing the cutting position in one place is the coarse and fine secondary cutting, so that the deformation amount after the first rough cutting is corrected in time in the fine cutting. Generally,China cut off disc the cutting amount during fine cutting should be determined according to the amount of deformation after the first cutting, and generally takes about 0.5 mm. This method is often applied to parts with complex shapes that are bound to be deformed or molds that require high precision and small clearance; 2) The habit of changing the two-point clamping is single-point clamping, so that the deformation during the cutting process can be freely stretched, and the interference of the two-point clamping on the deformation is prevented, but it should be noted that the reasonable part of the single-point clamping is usually at the end program. Where. The deformation produced in this way only affects the scrap portion and avoids the influence on the molded portion; 3) For the easily deformed cutting parts, the starting point of the cutting, the program direction and the clamping position should be arranged according to the shape characteristics of the parts to reduce the deformation amount. Generally, the starting point of the line cutting should be set in a flat, finished or incompletely affected part of the workpiece.
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