mid-speed wire cutting machine supply refers to the processing of forming and blanking tools, in addition to shearing dies and die-cutting dies. Usually, the mold consists of upper mold and lower mold. The steel plate is placed between the upper and lower molds, and the material is formed under the action of the press. When the press is opened, the workpiece determined by the shape of the mold will be obtained or the corresponding waste material will be removed. Workpieces as small as electronic connectors and as large as automobile dashboards can be formed using molds. A progressive die refers to a set of molds that can automatically move workpieces from one station to another, and obtain molded parts at the last station.

Cutting process of cemented carbide toothed punch:

1. Under normal circumstances

When the shape of the punch is regular, wire cutting processing often leaves the reserved connection part (pause point, that is, a small section of the cutting trajectory line reserved to prevent the workpiece from being separated from the blank after the first rough cutting) on the plane. In terms of position, after most of the precision cutting is completed, only one cut is made to the reserved connection part, which will be smoothed by a fitter later. This can reduce the processing cost of the punch in the middle wire cutting. Due to the high hardness of the material and the long and narrow shape of the cemented carbide punch, the processing speed is slow and it is easy to deform. Especially when the shape is irregular, the grinding of the reserved connection part brings great difficulty to the fitter. Therefore, the process can be appropriately adjusted during the wire cutting process stage to ensure that the dimensional accuracy meets the requirements, eliminating the need for the fitter to grind the pause points before assembly. Due to the high hardness of cemented carbide and the large cutting thickness, the processing speed is slow and the torsional deformation is serious. Most of the shape processing and reserved connection parts (pause points) are processed in 4 cuts, and the cutting parameters and offsets of the two parts are The offset is the same. The offset of the electrode wire (molybdenum wire) for the first cutting is increased to 0.15-0.18mm, so that the workpiece can fully release the internal stress and prevent torsional deformation. In the next three times, there will be enough margin for precision cutting, which can make The final dimensions of the workpiece are guaranteed.

The specific process analysis is as follows:

(1) Use a punch or EDM machine to process a Φ1.0-Φ1.5mm threading hole at the appropriate position of the blank in advance. The length of the incoming cutting line segment between the center of the threading hole and the contour line of the punch is selected to be 5-10mm.

(2) The width of the contour line of the punch and the edge of the blank should be at least 1/5 of the thickness of the blank.

(3) The connection part (pause point) reserved for subsequent cutting should be selected close to the center of gravity of the workpiece blank, and the width should be 3-4mm (depending on the size of the workpiece).

(4) In order to compensate for torsional deformation, leave most of the residual deformation in the first rough cutting stage and increase the offset to 0.15-0.18mm. Precision cutting was used for the next three times. Due to the small cutting allowance, the deformation also became smaller.

(5) After 4 cuttings of most shapes are completed, blow dry the workpiece with compressed air, clean the end face of the blank with alcohol solution, dry it, and then use adhesive or liquid quick-drying glue (usually 502 quick-drying glue) Glue) Glue the metal sheet with a thickness of about 0.3mm that has been ground by a grinder to the blank, and then cut the reserved connection part of the workpiece according to the original 4 offsets (note: do not drip glue onto the reserved part of the workpiece on the connecting part to avoid being non-conductive and unable to be processed).

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