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K20 ( Mining Bits )

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Type K20

Type K20 for making chisel and X-shaped cemented carbide drill bits.

Unit: mm

TypeDimension
LHSRαe
K20-9100210.013.08.020.02o30'1.0
K201212.012.016.03o
K201313.0
K201414.017.0
K201515.020.0
K201616.014.0
K20-9650116.522.013.026.0
K201717.014.08.020.0
K201919.022.0
K202020.016.010.023.01.5
K202222.025.0
K20-9650223.023.013.032.51.0
K202424.016.010.027.01.5
K202626.029.0
K202828.031.0
K203030.012.035.0
K2032B32.016.010.031.01.0
K203218.012.038.02.0
K203535.020.015.045.0
K204141.022.017.051.0
K204545.025.019.057.5
K205353.020.059.0

Technical Requirements

Allowable deviation in the size and shape of the cemented mining bits should be comply with following:

a. The flatness of the blank supporting plane should not more than 0.1mm, and flatness of non supporting plane should comply with the following:
    Unit: mm
ThicknessLength
10~20>20~40>40
Flatness
60.120.250.30
>6~100.100.200.25
>10~200.080.150.20

b. The allowable deviation of the length (L), height (H), diameter (D) should comply with the following. Among which, the allowable deviation of the length (L) of Model K10 is 0~+1.0mm; the allowable deviation of the height (H) of Model K10, K20, K21, K23 is -0.8~+0mm, and for the thickness (S) is -0.5~0mm; the allowable deviation of the height (H) of Model K0, K20, K21, K23 is -0.5~+0.2mm, and for the thickness (S) is -0.6~0mm.

    Unit: mm
Basic DimensionAllowable Deviation
Ordinary GradeAdvanced Grade
>5.0~11.0±0.25 
>11.0~18.0±0.50±0.35
>18.0~26.0±0.60±0.40
>26.0~34.0±0.80±0.45
>34.0~45.0±1.00±0.50
>45.0~55.0±1.10±0.60

The allowable deviation of the angle of the mining bits should comply with the following:  
 
AngleAllowable Deviation
≤5o0o~+1o
>5o~15o±1o
>15o±2o
 

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