FIELD: mining.
SUBSTANCE: gear of a drill bit consists of a shank with a convex generatrix and a convex rock-breaking part. The convex shank generatrix is designed so that the center of the shank has a diameter D exceeding the diameters at its ends by an amount δ=(0.3-0.4)Δ, where Δ - the calculated diametrical tightness of the shank of the tooth in the slot of the cutter. The convex shank generatrix can be made along a certain arc of a circle, a broken line or a logarithmic curve.
EFFECT: uniform distribution of contact pressures along the entire shank of the gear, reducing the crushing-shearing surface of the socket when pressing the gear.
2 dwg, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| RELLER BIT PICK | 2015 |
|
RU2633847C2 |
| DRILLING BIT WITH HARD-ALLOY CUTTING STRUCTURE | 2004 |
|
RU2270318C1 |
| METHOD FOR FASTENING AND REMOVING TEETH FROM WORN-OUT ROCK-BREAKING TOOL | 1991 |
|
RU2023851C1 |
| DEVICE FOR HARD-ALLOY DRILLING BIT CUTTER TESTING | 2006 |
|
RU2321839C1 |
| HARD-ALLOY ROCK-BREAKING CUTTING BIT OF CONE DRILL BIT | 1998 |
|
RU2166609C2 |
| METHOD FOR PRESSING OF BITS IN BODY OF ABRASION WHEEL | 2017 |
|
RU2654100C1 |
| ROTARY CUTTING BIT OF THREE-CONE DRILL BIT | 1992 |
|
RU2006566C1 |
| ROCK-BREAKING TOOTH OF DRILL BIT | 0 |
|
SU1344888A1 |
| METHOD FOR FIXING INSERTIBLE ROCK BREAKING TEETH | 0 |
|
SU1008402A1 |
| ROCK CUTTING TOOTH OF DRILLING BIT | 1998 |
|
RU2161685C2 |
