| Keep BMF | Hello! Welcome to BMF Hardware！ Log in | Register |

Conducting wire cutting, how to ensure the quality of wire cutting mold machining of great concern . Generally, line cutting should pay attention to the following aspects .

( 1 ) selection of a suitable mold material
Line cutting is usually carried out after the blank hardened , such as the use of T8A, T10A and other carbon tool steel, due to the difficulty hardenability , hardened layer shallow, after grinding through use may be worn while the hardness of the hardened layer decreased significantly. In order to improve the life of the wire die cutting and processing accuracy, excellent hardenability used tool steel or carbide alloy manufactured from these materials from the surface to the center hardness without significantly reduced.
( 2 ) improve the mechanical transmission accuracy
Mechanical transmission accuracy great influence on the machining accuracy , precision and table displacement motion precision wire electrode directly affect machining accuracy. As table movement driven by a plurality of sub- transmission , such as gears , screw nut , etc. , and their direct impact on driving accuracy machining accuracy . Wire motion accuracy to be affected by the guide wheel rotation accuracy , idler pulley uneven wear , slack wire and other effects as well. Thus, the mechanical transmission accuracy is not high quality and have a greater impact on the processing .

( 3 ) reduce the residual stresses
In a line cutting , it will cut off large pieces of metal , cause the material 's internal residual stress relative equilibrium is damaged, the stress will be re- distributed . Material sometimes more than the residual stress factors such as machine precision machining precision is also a serious , can reach macroscopic deformation degree visible , even in the process of cutting material will rupture. In order to reduce the residual stress caused by the deformation , should take appropriate measures, such as heat treatment specifications should be the right choice ; workpiece blank contour should be away from the edge of 8-100mm; online before cutting , can be aging treatment ; be pre-processed before quenching , remove most of the margin ; perform line cutting, using secondary cutting method , the first rough -cut holes , until the stress reaches a new equilibrium again when fine cutting shaped hole ; choose the correct cutting sequence and so on. The above measures to reduce the residual stress material good.

( 4 ) reduce the surface roughness
The surface roughness of the mold cavity level of quality plastic parts have a greater impact in the time of cutting should find ways to reduce the surface roughness . Therefore, we should take the relevant measures, such as electrode wire tension is not enough, the tension should always be ; feed rate should be adjusted appropriately to avoid fluctuations in speed ; mechanical transmission gap is too big too easy to make wire shaking, plus the roughness large , this should promptly adjust the tightness of mechanical transmission parts ; correct choice electrical parameters, avoiding a single pulse is too large. In addition, the wire electrode wire walking too fast or the occurrence of jitter, will also affect the parts of the surface roughness . They are unfavorable for quality improvement .