Violet Series, High Precision Drills for Counter Boring VA-PDS-CB. Regrinding Manual. July 23, 2010

Transcription

1 Violet Series, High Precision Drills for Counter Boring VA-PDS-CB Regrinding Manual July 23, 2010 MITSUBISHI MATERIALS CORPORATION Carbide & Tools Division

2 Preliminary note Check wear condition and damage to the cutting edge. Please pay attention to the grinding temperature because high grinding temperatures cause a grinding crack or loss of hardness. primary relief face method of VA-PDS-CB and general drills (Conical point, 4 facet point) 140 grinding (shown as below diagram) is used for VA-PDS-CB. pass is same as that for grinding of facet point (first relief face of 4 facet point). The case that your machine is capable to grind with only side of cup (Case A of below diagram), program of X shinning can be substitute for that of primary relief. 140 Cup CASE A General drill VA-PDS-CB Shape of grinding Over Dx0.5 Over Dx0.2 (D:drill diameter) 140 CBN Grain size:#200~

3 Position and method (primary relief face) Set the drill as the line connecting the shoulder of both sides is aligned horizontally (Fig. 1). 2. Rotate the drill counter clockwise 20 when viewed from the top (Fig. 1). Fig. 1 Point This line becomes vertical X Y direction L 1 83 Fig. 2 L 1 =0.5 Max. diameter x (1-sin7 ) + Drill diameter x sin X A Fig. 3 (View from Y) Fig. 4 (View from X) 3. Get the inclined 2.5 (Fig. 3). Align the position that the distance from center of drill to the corner of is 0.5 x A (Fig. 3). Value of A is listed on page Set the height so that the center line of the drill is located higher than the bottom of the edge by L 1. L 1 is calculated by the formula in Fig Grind primary relief face in the direction shown by the arrowhead of Fig. 4.

4 thinning face method of VA-PDS-CB and general drills (Conical point, 4 facet point) method is same as that for X thinning of general drill. Shape of grinding Over Dx0.6 (D:drill diameter) 110 CBN Grain size:#200~

5 Position and method (thinning face) 70 Fig X B X L 2 70 direction Fig. 6 L 2 =0.5 Max. diameter x (1-cos35 ) + width x tan20 x cos x C Fig. 7 (View from X) 1. Set the drill as the line connecting the shoulder of both sides is aligned horizontally (figure 5). 2. Rotate the drill counter clockwise 70 when viewed from the top (figure 6). Align the position that the distance from center of drill to the side of is 0.5 x B (figure 6). Value of B is listed on page Set the height so that the center line of the drill is located higher than the bottom of the edge by L 2. L 2 is calculated by the formula in Fig Grind thinning face in the direction shown by the arrowhead of Fig. 7. Note Point Connect cutting edge of thinning and valley line of primary face in this point.

6 Honing It is not necessary to hone. Point to be checked There is no damage left on the cutting edge. There is no regrinding burr. Reference : Image of grinding primary relief face direction thinning face

7 Reference : Shape of point : Part of grinding first relief face 160 : Part of grinding thinning face 110 B Basis of measurement of angle is the line connecting the shoulder of both sides. A C 7 55 Unit: mm Drill diameter (D 1 ) A B C 3.0 D 1 < D 1 < D 1 < D 1 < D 1 < D 1 < D 1 < D 1 < D 1 < D