Present position : Home>Index>PCB Tools>Drill Manufacturing Process

Techical Database

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 Fig.1
    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  Fig.2
    Length of carbide chip (Fig.2)
     
  SPC method
    Cut-off check sheet
     

3. Composite process of carbide chip

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

4. Manufacturing process of drill blank

  Check point in this process  Fig.4
* "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  Fig.5
    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
       
Fig.6
     
  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
 
       


Menu

  • Company Profile
  • Recruitment
  • Product Information
  • Technical Information
  • Event/Exhibition
  • IR Information
  • Community Service