Different process methods, in different applications may have different advantages. Slow walking wire processing process affects the main factors of product performance are process, materials, use and other aspects. So, what is the slow-walking processing of the examination? Let's take a look at the following introduction.
What are the considerations of slow-walking processing
(1) the choice of suitable mold materials
Slow wire processing is generally in the blank hardened, such as the use of T8A, T10A and other carbon tool steel, due to the difficulty of quenching, hardened layer shallow, by using the repair and grinding may be hardened layer worn off and a significant drop in hardness. In order to improve the service life and processing accuracy of wire-cutting tooling, should choose to use good hardenability of alloy tool steel or carbide to manufacture, these materials from the surface to the center of the hardness does not significantly reduce.
(2) Improve the mechanical transmission accuracy
The accuracy of mechanical transmission has a great impact on machining accuracy, the accuracy of table displacement and the accuracy of electrode wire movement both directly affect machining accuracy. As the movement of the table is driven by several transmission subsets, such as gear subsets, screw nut subsets, etc., their transmission accuracy directly affects the machining accuracy. The movement accuracy of the electrode wire is affected by the rotation accuracy of the guide wheel, the uneven wear of the guide wheel and the slackness of the electrode wire. It can be seen that the mechanical transmission accuracy is not high to have a greater impact on the processing quality.
(3) Reduce residual stress
In the wire cutting process, large pieces of metal will be cut off, which will cause the relative balance of internal residual stresses in the material to be disrupted, and the stresses will be redistributed. The residual stress in the material is sometimes more serious than the impact of machine accuracy and other factors on the machining accuracy, can make the deformation to a macroscopic degree visible, even during the cutting process the material will break. In order to reduce the deformation caused by residual stresses, measures should be taken, such as the correct choice of heat treatment specifications; workpiece profile should be 8-100mm from the edge of the blank; before wire cutting, aging treatment can be carried out; pre-machining before quenching to remove a large part of the residual; wire cutting, the use of secondary cutting method, the first rough cut type hole, to reach a new balance of stresses and then fine cutting type hole; choose the correct The above measures are important to reduce the residuals in the material. The above measures are very beneficial to reduce the residual stress in the material.
(4) Reduce the surface roughness
The surface roughness of the mold cavity has a great impact on the quality of the plastic parts, and should be thought of ways to reduce the surface roughness during the cutting process. For this reason, relevant measures should be taken, such as the electrode wire tension is not enough, should always be tightened; feed speed should be adjusted appropriately to avoid fluctuations in speed; mechanical transmission gap is too large is also easy to make the electrode wire shake, so that the roughness increases, to adjust the mechanical transmission part of the tightness in a timely manner; the correct choice of electrical parameters, to avoid a single pulse is too large. In addition, the electrode wire walking speed is too fast or shaking, will also affect the surface roughness of the parts. They are not good for quality improvement.
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