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Sintered cutting plates
 
   Cutting plates for incisors with mechanical mounting of cutting plates made of material based on green rouge: "Bichromit-R" (а.с. USSR №175014, №1780284, №1676220), with high mechanical and cutting potential
 
Table 1. Basic physic-mechanical characteristics of "Bichromit-R" plates
Hardness, НRa 92 ... 93
Hardness, GPA 20 ... 21
Density, mg/m 5,6
Compressing Density, МPа 2600 ... 2800
Bending strength (Т=20...9000C), MPa 600 ... 800
Thermo conductivity, Vt/mK
at 220C 28
at 4000C 35
Elasticity coefficient 350
Stress intensity factor, K1c.Mn3/2 6,5 ... 8
 
    The tool equipped with these plates due to higher thermal and wearing endurance makes possible using higher cutting velocity. Plates have a slight trend to be wrapped with the processed material, but have a good abrasion-resistance and wearing endurance.


Таble 2. Comparative characteristics of cutting process with steel 45
Type
Producer
Cutting Modes
 V, m/min
S, mm/turn
t, mm
Т, min
CMI "Walter", Germany 300 0,075 0,5 35
CC620 "Coromant", Sweden 350 0,075 0,5 40
Bichromit "Cermet-U", Ukraine 350 0,075 0,5 38
ICM ICM Ukraine 400 0,1 0,5 35

 
 
Таble 3. Some tool materials stability dependence (Т,min) at steel ШХ15 (HRC 60..62) turning on the cutting velocity (V,m/min). Cutting Modes: S=0.075 mm/turn, t=0.2 mm.
Type Producer V, m/min
 50  100 150  300
CC620
"Coromant", Sweden
360 60 20 10 
ВОК71
ВНИИТС, Russia
260 120 40 28
Bichromit
"Cermet-U", Ukraine 
260 160 80 45
HCI
"Ceramik", Japan
280 175 60  30

    According to these tables one can see the comparative characteristics of "Bichromit-R" with other forms of plates during the processing of average hardness steels, and the significant advantage in steel processing at high cutting velocity, providing a high processing surface cleanness.

    Cutting plates are made in unreface plate form and have a shape and sizes according to the All- Union State Standards. Mounting method is mechanical, without holes. The plates can be produced according to the orderer's shape and sizes.
 
Conditions recommended for different materials cutting with the help of cutting plates made of "Bichromit-R" at:

1. Steel processing:
  • High-speed finishing, half-finishing, discrete turning of hardened chemically processed carbon alloyed stainless steels HRC 60-64.
    Cutting conditions:
               V=100-200 m/min, t=0,1-1 mm, s=0,07-0,11 mm/turn;
  • Ultraspeed steel turning HRC 50-54.
  • Cutting conditions:
               V=100-600 m/min, t=0,2-1,5 mm, s=0,07-0,11 mm/turn;
  • Roughing steel processing;
  • Finishing hardened steel processing Ra 0,63-0,7;
2. Cast iron processing including high-tensile white ones:
  • finishing processing.
    Cutting conditions:
    V=300-800 m/min, t=0,2-0,4 mm, s=0,07-0,11 mm/turn;
  • roughing processing.
    Cutting conditions:
    V=120-250 m/min, t=1-3 mm, s=0,2-0,5 mm/turn;
3. Surfacing processing (wire ПП-АН-100):
  • finishing.
    Cutting conditions:
    V=80-120 m/min, t=0,2-0,6 mm, s= 0,11 mm/turn;
    Nowadays we continue to improve the plates cutting characteristics due to the perfection of the producing technology of ''Bichromit-R'' made plates.

 

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