Drill Manufacturing Process

Our drills are completely made by UnionTool's own equipment. For high quality products and stable supply, we have several inspection processes in our drill manufacturing system.
Within this content, you can see the manufacturing process of under cut drills (UC type) for an example.

1. Incoming inspection (Tungsten carbide rod)

Check point in this process     TRS strength test (Fig.1) Removal of defective rod (Visual inspection)         SPC method     Check sheet Inspection sheet

2. Cutting process of carbide rod

Check point in this process       Length of carbide chip (Fig.2)         SPC method     Cut-off check sheet

3. Plunging process of carbide chip

Check point in this process       Overall length (Fig.3) Shank to body concentricity Tensile strength         SPC method     Assembly check sheet

4. Manufacturing process of drill blank

Check point in this process   * "Drill blank" means the material befor cut flute     Diameter Undercut diameter Shank diameter Cylindricity Shank to body concentricity         SPC method       Blank check sheet

5. Intermidiate inspection of blank

Check point in this process       Diameter (1) Undercut diameter (2) Shank diameter (3) Appearance         SPC method     Blank inspection report

6. Cutting process of flute, relief and point

Check point in this process       Web thickness Body clearance Margin width Margin length Helix angle Point angle Primary angle Secondary angle Overall length Flute land ratio Flute length Body length Chisel point inconcentricity Web taper                 SPC method       Check sheet

7. Cleaning process

Check point in this process       No dust. No cutting oil.             SPC method       Cleaning solution check sheet

8. Final inspection of drill (Automatic AOI)

Check point in this process       Flute length Overall length Margin width Margin length Chisel point inconcentricity Body clearance Web thickness Helix angle Point angle Body length Gap, Overlap Primary flare, Primary taper Chipping Appearance           SPC method       Inspection sheet Inspection report

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