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Because the material itself will have stress, cutting will definitely break the balance of the original stress and reach a new balance, but the stress will vary from large to small, and the deformation will vary in size. This is like splitting a piece of bamboo in the middle. All bend, most of the curve is less, and the other half is much more curved. Wire cutting is the same thing, but the deformation is small enough to be within the final accuracy range, and the processing is completed. Stress is an inherent elasticity that is inherent in the material and increases with the increase in strength and hardness and temporarily balances it. So the harder the hardened material, the greater the deformation. Such materials require repeated forging prior to quenching and uniform organization. And a large amount of machining allowances and large pieces of scrap are removed before quenching, that is, the part of the stress that has been temporarily balanced during quenching is basically removed. What is cut off after quenching is the small part that reaches the balance of stress. This will cause much less distortion due to wire cutting. When the quenching process is not done and the margin is not removed, what does it take to obtain a solid material with strong and complete stress? Then we have to rely on our wire cutting to eliminate stress and remove excess. That is rough, calculate the amount of retention, set a good chuck, and remove most of the margin. Get a shape that is very close to the final workpiece, new hair that does not have much deformability. If you add a high-low temperature aging treatment, material deformation can be completely resolved.
Second, the shape problem:
The above is mainly the material deformation, because the special slender shape parts will also be deformed, such as the punch of the clock of the clock of the clock, the die and the punch of the punch of the spring clip, they will be cut a small narrow because of the big hair. The article removes the unrecognizable parts, not to mention the fact that a few μ can only allow more than a dozen μs. This type of part that is easily deformed due to its shape can be pretreated only with rough raw material, and processed into a semi-finished product with a very small margin before quenching. During the quenching process, the workpiece is fully deformed, and the cutting path and clip are selected when cutting. The position of the head is sure to get qualified parts.
Third, the cutting entrance problem Material deformation will also have a prominent phenomenon, that is, cutting the entrance can not be closed, this is mostly because the pressure plate pressure is not in the right place, did not crushed the entrance, in the cutting process, the entrance has been deformed Displacement occurred. Even though the coordinates returned to their original positions, the entrance had already run away, causing the entrance to step on the wrong side. It took a long time to obtain a waste product. This depends on the full understanding of the material deformation, the corresponding measures taken earlier, cutting also take the appropriate method, the so-called cutting experience is also here.
First, raw material issues: