Different PDC sheet thicknesses have different effects on residual thermal stress(The thickness ratio of the PCD layer to the cemented carbide base layer in the PDC sheet is5:6, with the thickness of the PCD layer as a change factor). Brazing seam and PDCThe side of the sheet welding interface is mainly tensile stress, which is easy to cause PDC tool production.

Defects such as cracks, the influence trend is shown in Figure 3 and Figure 4. Residual in the pictureThe trend of residual thermal stress indicates that as the thickness of PDC increases,Straight to the welding joint between the brazing seam and the PDC sheet)The tendency to decrease after adding, when the thickness of the PCD layer is about 0.9 mmThe peak value is about 40MPa; the Y direction (parallel to the brazing seam and PDC)The welding interface direction) tensile stress is gradually increasing, themaximum valueIt is about 55MPa; the Z-direction shear stress tends to decrease gradually.

From the average value and the maximum value, the residual thermal stress increases with the thickness of the PCD layer.

The increase of the degree, the trend of increasing first and then decreasing, the thickness of the PCD layerWhen the degree is about 1.3 mm, it reaches a peak value of about 80 MPa.