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   BORING - HARDENED STEEL

 

     Internal Grinding is time consuming and expensive. For small bores David Richards provide a simple solution

    - Hard Boring.

 

    For bores down to 10 mm David Richards provide cost effective triangular cutting tool inserts with 3 PCBN edges in
    grades DR-50/450 and a range of boring bar tool holders to suit - steel shank boring bars for bore depths up to
    2 times shank diameter and heavy metal for bore depths up to 4 times shank diameter.

 

 

 
     For ‘Back Boring’, stepped bores and other applications which do not accommodate the standard products,
     David Richards manufacture tool holders to suit.
 
     If distortion and size variation as a result of heat treatment places unreasonable constraints on ‘Soft Stage’ machining,
     ‘Hard Boring’ will provide a cost effective, scrap reducing alternative. Turn a lathe into a universal grinding machine
     and a machining centre into a jig grinder. Combine internal and external grinding operations - even grooving -
     and replace grinding minutes with Hard Turning’ seconds.
     BORING - SMALL BORES - HARDENED STEEL

    

     For Bore sizes smaller than 8 mm in diameter, it is not possible to use PCBN tipped cutting tool inserts.
     In order to put a PCBN tip into the carbide insert, material must be removed. This makes the insert weak and prone to      breakage when it is clamped into the boring bar.
 
     At the same time, clamping of small inserts into small boring bars becomes progressively more difficult as the bore size      reduces.Top clamps trap swarf and, in order to fit inside the bore, become too small to exert enough clamping pressure.      Screw locked inserts, while leaving space for swarf, require sufficient material under the insert for the thread of the
     clamping screw.
 
     These problems are overcome by using brazed tools. The PCBN tip is brazed directly to a tungsten carbide shank
     providing a rigid boring tool capable of remarkable surface finishes and providing a highly productive alternative to
     internal grinding.
 
     David Richards provide boring tools, supplied from stock in a range of standard sizes.
 
     For Bore sizes smaller than 8 mm in diameter, it is not possible to use PCBN tipped cutting tool inserts. In order to put a     PCBN tip into the carbide insert, material must be removed. This makes the insert weak and prone to breakage when it is     clamped into the boring bar.
    
    At the same time, clamping of small inserts into small boring bars becomes progressively more difficult as the bore size     reduces. Top clamps trap swarf and, in order to fit inside the bore, become too small to exert enough clamping pressure.
    Screw locked inserts, while leaving space for swarf, require sufficient material under the insert for the thread of the
    clamping screw.
 
    These problems are overcome by using brazed tools. The PCBN tip is brazed directly to a tungsten carbide shank
    providing a rigid boring tool capable of remarkable surface finishes and providing a highly productive alternative to
    internal grinding.
 
     David Richards provide boring tools, supplied from stock in a range of standard sizes.

     Corner radii are 0.2 - 0.4 mm depending on bore depth/bore length ratio.
     All tools are tipped with grade DR-50.

Shank Diameter Ømm
Minimum Bore Diameter Ømm
Maximum Bore Length L mm
DR Part No.
8
8
24
C8B(8x24)
8
8
16
C8B(8X16)
8
7
21
C8B(7X21)
8
7
14
C8B(7X14)
6
6
18
C6B(6X18)
6
6
12
C6B(6X12)
6
5
15
C6B(5X15)
6
5
10
C6B(5X10)
6
4
12
C6B(4x12)
6
4
8
C6B(4X8)
6
3
9
C6B(3X9)
6
3
6
C6B(3X6)

  

     Specials can be designated by shank size and require Bore Ø x Bore Depth.
     ie. C6B (4 x 14) DR-50 will be 6mm Ø shank Boring 4mm Ø x 14mm deep in Grade DR-50.

 

 

 

 

© David Richards Engineering  2008