CN210439971U - One-step formed hole drilling bit - Google Patents
One-step formed hole drilling bit Download PDFInfo
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- CN210439971U CN210439971U CN201920920695.3U CN201920920695U CN210439971U CN 210439971 U CN210439971 U CN 210439971U CN 201920920695 U CN201920920695 U CN 201920920695U CN 210439971 U CN210439971 U CN 210439971U
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- reaming
- cutting blade
- cutting
- hole
- blade
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Abstract
The utility model discloses a one-time forming tapping drill bit, which comprises a drill rod and a one-time tapping cutting tool, wherein a reaming cutter holder is welded on the drill rod and is connected with the one-time tapping cutting tool; a secondary reaming cutting blade and a final forming cutting blade are welded on the reaming cutter seat; the secondary reaming cutting insert is located between the primary hole cutting insert and the final form cutting insert. The secondary reaming cutting blade is used for further reaming of the primary drilled hole, and the final forming blade is used for final forming of the pilot hole. The utility model discloses the increase influence of reaming cutting blade and the blade holder of increase to drill bit weight itself is little. And the drill bits are distributed in a step shape, so that the drill bits cannot generate the phenomena of deviation or hole channeling and the like during drilling, and the stability of drilling is effectively ensured. The coal seam underground mining method solves the problems that in the prior art, when a fire guide hole is drilled, drill bits with different hole diameters need to be frequently replaced, and the reaming action is repeatedly carried out for many times, so that the working time is shortened, and the investment of manpower and equipment is reduced.
Description
Technical Field
The utility model relates to a reaming drill bit especially relates to a one-time fashioned trompil drill bit of colliery underground mining.
Background
In the process of underground mining of the coal seam, a fire guide hole needs to be drilled when the coal seam is burnt, a fire guide pipe is arranged in the fire guide hole, and the fire guide pipe is made of spiral net pipes. For the drilling of the pilot hole with larger aperture, because the power of the drill motor is small, the motor can not be driven when the drill which meets the installation requirement of the diameter of the spiral net pipe is directly used for one-time drilling. In the prior art, during reaming construction, after a primary hole opening drill bit is adopted for drilling, secondary reaming is carried out by adopting a secondary reaming drill bit, and finally, the drill bit meeting the installation requirement of the spiral net pipe is adopted for carrying out three or more times of reaming to finally form, so that the reaming forming efficiency is low. The weight of reaming bit is too heavy again, and the drill bit is single-edged blade moreover, and stability during reaming is poor, can drill towards the drilling bottom plate after the reaming once during secondary reaming, leads to the reaming failure.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the utility model provides a one shot forming trompil drill to use a plurality of reamer bits to carry out reaming many times and the problem that the reaming success rate is low among the prior art is solved.
The technical scheme of the utility model is that:
the one-time forming tapping drill bit comprises a drill rod and a one-time tapping cutting tool, wherein a reaming cutter holder is welded on the drill rod and is connected with the one-time tapping cutting tool; a secondary reaming cutting blade and a final forming cutting blade are welded on the reaming cutter seat; the secondary reaming cutting insert is located between the primary hole cutting tool and the final form cutting insert.
The cutting edges of the secondary reaming cutting blade and the final forming cutting blade are alloy sheets.
The alloy sheet is WC-Co hard alloy.
The cutting diameter of the secondary reaming cutting blade is smaller than that of the final forming cutting blade and is larger than that of the primary opening cutting blade; the three blades are distributed in a step shape along the axial direction of the drill rod.
The primary tapping cutting blade, the secondary reaming cutting blade and the final forming cutting blade are of three-fork type structures, and chip discharge grooves among the cutter sets are distributed in a spiral shape.
The utility model discloses beneficial effect:
a one-step forming drill bit is light in weight and has blades distributed in a step shape. During reaming, the drill bit can not deviate to the drilling bottom plate due to overlarge weight of the drill bit, so that reaming failure is caused, and the drilling success rate is greatly improved. The cutting blades of the drill include a primary hole-opening blade, a secondary hole-enlarging blade and a final-formed blade. And the three blades are distributed in a step shape along the axial direction of the drill rod, so that the tapping, the reaming and the forming of the fire guide hole are completed in one step, and the drilling stability is high. The time for carrying out multiple chambering by replacing different chambering drills is shortened, and the drilling efficiency is greatly improved. Thereby achieving the purpose of reducing the consumption of manpower and material resources.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a top view of fig. 1.
Detailed Description
A one-time forming tapping drill bit comprises a drill rod 1 and a one-time tapping cutting tool 2, wherein a reaming cutter holder 3 is welded on the drill rod 1 and is connected with the one-time tapping cutting tool 2; a secondary reaming cutting blade 4 and a final forming cutting blade 5 are welded on the reaming cutter seat 3; a secondary reaming cutting insert 4 is located between the primary hole cutting tool 2 and the final form cutting insert 5.
The cutting edges of the secondary reaming cutting blade 4 and the final forming cutting blade 5 are alloy sheets, and the alloy sheets are made of WC-Co hard alloy. The alloy sheet is welded on one side of the cutting surface of the cutter holder 2, so that the strength requirement of the blade during cutting work is ensured.
The cutting diameter of the secondary reaming cutting blade 4 is smaller than that of the cutting blade 5 which is finally formed and is larger than that of the primary tapping cutting blade 2, and the three groups of blades are integrally distributed in a step shape along the axial direction of the drill rod 1; the whole weight of the drill bit after welding is light, and the drill bit can not deviate when drilling, so that the drilling success rate is improved.
The primary tapping cutting blade 2, the secondary reaming cutting blade 4 and the final forming cutting blade 5 are of a three-fork structure, and chip discharge grooves among the cutter sets are distributed in a spiral shape, so that the drill bit can discharge cut slag chips conveniently.
Claims (4)
1. One shot forming's trompil drill bit, it includes drilling rod (1) and a trompil cutting tool (2), its characterized in that: the reaming cutter holder (3) is welded on the drill rod (1) and is connected with the primary tapping cutting tool (2); a secondary reaming cutting blade (4) and a final forming cutting blade (5) are welded on the reaming tool holder (3); the secondary reaming cutting blade (4) is positioned between the primary hole opening cutting tool (2) and the final forming cutting blade (5), the cutting diameter of the secondary reaming cutting blade (4) is smaller than that of the final forming cutting blade (5) and larger than that of the primary hole opening cutting tool (2), and the three blades are distributed in a step shape along the axial direction of the drill rod.
2. The one-shot drill bit as recited in claim 1, wherein: the cutting edges of the secondary reaming cutting blade (4) and the final forming cutting blade (5) are alloy sheets.
3. The one-shot drill bit as recited in claim 2, wherein: the alloy sheet is WC-Co hard alloy.
4. The one-shot drill bit as recited in claim 1, wherein: the primary hole-opening cutting tool (2), the secondary hole-expanding cutting blade (4) and the final-forming cutting blade (5) are of a three-fork structure, and chip-discharging grooves among the cutter sets are distributed in a spiral shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920920695.3U CN210439971U (en) | 2019-06-19 | 2019-06-19 | One-step formed hole drilling bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920920695.3U CN210439971U (en) | 2019-06-19 | 2019-06-19 | One-step formed hole drilling bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210439971U true CN210439971U (en) | 2020-05-01 |
Family
ID=70403616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920920695.3U Active CN210439971U (en) | 2019-06-19 | 2019-06-19 | One-step formed hole drilling bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210439971U (en) |
-
2019
- 2019-06-19 CN CN201920920695.3U patent/CN210439971U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |