CN218748342U - Single-blade composite woodworking drill bit - Google Patents
Single-blade composite woodworking drill bit Download PDFInfo
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- CN218748342U CN218748342U CN202121755859.5U CN202121755859U CN218748342U CN 218748342 U CN218748342 U CN 218748342U CN 202121755859 U CN202121755859 U CN 202121755859U CN 218748342 U CN218748342 U CN 218748342U
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Abstract
The utility model provides a compound carpenter's drill bit of single-blade, including boring body and drill handle, be equipped with two helicla flutes on the boring body, boring body front end center is equipped with the self-tapping head, helicla flute and boring body front end juncture are equipped with the main cutting edge, the main cutting edge is formed through preceding, back knife face butt joint, the main cutting edge is a straight line, the rake face is parallel with boring body axis, the main cutting edge is rotatory and is formed a circular plane and make this circular plane perpendicular with boring body axis as the center, the main cutting edge is equipped with the enhancement sword of connecting vice cutting edge and main cutting edge towards the one end of boring body outer cylinder wall, enhancement sword line is parallel with boring body axis; one of the rear cutter faces is deviated towards one side of the drill shank and forms a rotary blade at the junction of the rear cutter face and the outer cylindrical wall of the drill body. The utility model has the advantages of structural strength is high, and the wearability is good, long service life, can effectively protect the main cutting edge when meetting the metal peg during drilling and cut off the metal peg.
Description
Technical Field
The utility model relates to a carpenter's drill bit field, concretely relates to compound carpenter's drill bit of single-blade.
Background
The woodworking drill bit generally includes the drill body, be located the drill handle of drill body rear end to and set up the helicla flute constitution on the drill body, but the main cutting edge of current woodworking drill bit generally is that direct back knife face handing-over through helicla flute and drill body front end forms, consequently main cutting edge often is the arc on the projection plane of direction of feed, the anterior angle of its rake face often equals the helix angle of helicla flute, so its anterior angle is positive, though comparatively sharp, but in case when meetting the hardblock or the metal peg in the timber, main cutting edge damages extremely easily, is unfavorable for punching on the timber of hidden metal peg.
SUMMERY OF THE UTILITY MODEL
Based on the problem, the utility model aims to provide a compound carpenter's drill bit of single-edged that cuts off the metal peg when can effectively protect the main cutting edge when meetting the metal peg during drilling that structural strength is high, and the wearability is good, long service life.
Aiming at the problems, the following technical scheme is provided: a single-edge composite woodworking drill comprises a drill body and a drill handle positioned at the rear end of the drill body, wherein two spiral grooves which are arranged at intervals of 180 degrees are formed in the drill body along the circumferential direction of the drill body, the spiral grooves are right-handed, a self-tapping head is arranged in the center of the front end of the drill body, a main cutting edge is arranged at the junction of the groove wall of one side, facing the rotating direction, of each spiral groove and the front end of the drill body, the main cutting edge is formed by butting a front cutter face and a rear cutter face, the main cutting edge formed by butting the front cutter face and the rear cutter face is a straight line, the front cutter face is parallel to the axis of the drill body, the main cutting edge rotates by taking the axis of the drill body as the center to form a circular plane, the circular plane is perpendicular to the axis of the drill body, a reinforcing edge for connecting an auxiliary cutting edge and the main cutting edge is arranged at one end, facing the outer cylindrical wall of the drill body, of the main cutting edge, and the reinforcing edge line is parallel to the axis of the drill body; one of the rear cutter faces is deviated towards one side of the drill shank and forms a rotary blade at the junction of the rear cutter face and the outer cylindrical wall of the drill body, and the position of a tool nose at the junction of the rotary blade and the reinforcing blade and the position of a tool nose at the junction of the other main cutting blade and the reinforcing blade are in the same rotary plane.
In the structure, the structure that the existing drill directly takes a spiral groove as a front cutter face is cancelled, the front cutter face is additionally arranged on the spiral groove and is arranged to be parallel to the axis of the drill body, namely the front angle is set to be 0 degree, so that the strength of the main cutting edge is enhanced, the sharpness is ensured, and the cutting resistance of the main cutting edge can be reduced by the main cutting edge with a linear structure; the main cutting edge rotates by taking the axis of the drill body as a center to form a circular plane, and the circular plane is perpendicular to the axis of the drill body, so that the flatness of the bottom of the hole can be ensured; the reinforcing blade can replace the auxiliary cutting blade of the existing drill so as to enhance the strength of a tool nose formed at the joint of the main cutting blade and the reinforcing blade; the rotary blade is used for cutting and trimming the hole wall during drilling, wood in the hole wall is cut and separated before the main cutting blade cuts, so that the main cutting blade can conveniently cut and remove chips, and the hole wall can be trimmed.
The utility model discloses further set up as, the contained angle between back knife face and the rake face is between 60 degrees-85 degrees.
In the above structure, the included angle (referred to as wedge angle β in the technical term) between the flank face and the rake face is 60 to 85 degrees, i.e., the included angle is equal to the clearance angle of the flank face being 5 to 30 degrees, so that the strength and rigidity of the main cutting edge can be effectively ensured.
The utility model discloses further set up to, helicla flute pitch is 3 with boring body diameter ratio: 0.5-1.5.
In the structure, the ratio of the pitch of the spiral groove to the diameter of the drill body is preferably 3:1.
the utility model discloses further set up as, the gyration sword is kept away from the one end of strengthening the sword and is toward drillstock lopsidedness.
In the above-mentioned structure, can reduce the cutting resistance of gyration sword, make the cutting more smooth and easy.
The utility model discloses further set up to, self tapping is overhead to be equipped with self tapping screw.
In the structure, the self-tapping thread can provide axial feeding force when the drill bit rotates, and can play a role in centering and stabilizing the drill feeding posture.
The utility model discloses further set up to, the latter half section that bores the body is kept away from to the drillstock is equipped with the hexagon clamping part.
In the structure, the hexagonal clamping part is convenient for the drill chuck to clamp.
The utility model has the advantages that: the existing drill is cancelled to directly use a spiral groove as a front cutter face, the front cutter face is additionally arranged on the spiral groove and is arranged to be parallel to the axis of the drill body, and the front angle is equal to 0 degree, so that the strength of the main cutting edge is enhanced, the sharpness is ensured, and the cutting resistance of the main cutting edge can be reduced by the main cutting edge with a linear structure; the main cutting edge rotates by taking the axis of the drill body as a center to form a circular plane, and the circular plane is perpendicular to the axis of the drill body so as to ensure the flatness of the bottom of the hole; the reinforcing blade can replace the auxiliary cutting blade of the existing drill so as to enhance the strength of a tool nose formed at the joint of the main cutting blade and the reinforcing blade; the rotary blade is used for cutting and trimming the hole wall during drilling, wood within the hole wall is cut and separated before the main cutting blade cuts, so that the main cutting blade can conveniently cut and remove chips, and the effect of trimming the hole wall can be achieved.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is the orthographic projection structure diagram of the main cutting edge of the present invention.
Fig. 3 is an enlarged schematic view of a portion a of fig. 1 according to the present invention.
Fig. 4 is a schematic view of the angle and relief angle structure of the present invention.
The reference numbers in the figures mean: 10-drilling a body; 11-a helical groove; 12-self-tapping head; 121-self-tapping threads; 13-a main cutting edge; 14-a rake face; 15. 15' -flank face; 16-a minor cutting edge; 17-a reinforcing edge; 18. 18' -a blade tip; 19-a rotating blade; 20-a drill shank; 21-a hexagonal clamping portion; a 1-included angle; a 2-relief angle.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 1 to 4, the single-edge composite woodworking drill shown in fig. 1 to 4 includes a drill body 10 and a drill shank 20 located at the rear end of the drill body 10, the drill body 10 is provided with two spiral grooves 11 arranged at an interval of 180 degrees along the circumferential direction of the drill body 10, the spiral grooves 11 are right-handed, the center of the front end of the drill body 10 is provided with a self-tapping head 12, a main cutting edge 13 is arranged at the junction of the groove wall of one side of the spiral groove 11 facing the rotation direction and the front end of the drill body 10, the main cutting edge 13 is formed by butting a rake surface 14 and a flank surface 15, the main cutting edge 13 formed by butting the rake surface 14 and the flank surface 15 is a straight line, the rake surface 14 is parallel to the axis of the drill body 10, the main cutting edge 13 rotates around the axis of the drill body 10 to form a circular plane and the circular plane is perpendicular to the axis of the drill body 10, one end of the main cutting edge 13 facing the outer cylindrical wall of the drill body 10 is provided with a reinforcing edge 17 connecting the secondary cutting edge 16 and the main cutting edge 13, and the reinforcing edge 17 line is parallel to the axis of the drill body 10; one flank face 15 'is deviated towards one side of the drill shank 20 and forms a rotary blade 19 at the junction of the flank face 15 and the outer cylindrical wall of the drill body 10, and the position of a tool nose 18' at the junction of the rotary blade 19 and the reinforcing blade 17 and the position of a tool nose 18 formed at the junction of the other main cutting edge 13 and the reinforcing blade 17 are in the same rotary plane.
In the structure, the structure that the existing drill directly uses the spiral groove 11 as a rake face is eliminated, the rake face 14 is additionally arranged on the spiral groove 11, the rake face 14 is arranged to be parallel to the axis of the drill body 10, and the rake angle is equal to 0 degree, so that the strength of the main cutting edge 13 is enhanced, the sharpness is ensured, and the cutting resistance of the main cutting edge 13 can be reduced by the main cutting edge 13 with a linear structure; the main cutting edge 13 rotates by taking the axis of the drill body 10 as a center to form a circular plane, and the circular plane is perpendicular to the axis of the drill body 10, so that the flatness of the bottom of the hole can be ensured; the reinforcing edge 17 can replace the secondary cutting edge 16 of the existing drill so as to enhance the strength of a tool nose 18 formed at the joint of the main cutting edge 13 and the reinforcing edge 17; the rotary blade 19 is used for cutting and trimming the hole wall during drilling, and wood in the hole wall is cut and separated before the main cutting blade 13 cuts, so that the main cutting blade 13 can conveniently cut and remove chips, and the hole wall trimming function can be achieved.
In the embodiment, the included angle a between the flank surface 15 and the rake surface 14 is 60 degrees to 85 degrees.
In the above structure, the included angle a1 (referred to as a wedge angle β in the technical term) between the flank and the rake face is 60 to 85 degrees, that is, 5 to 30 degrees, which is equal to the clearance angle a2 of the flank face 15, so that the strength and rigidity of the main cutting edge 13 can be effectively ensured.
In this embodiment, the diameter ratio of the pitch of the spiral groove 11 to the drill body 10 is 3: 0.5-1.5.
In the structure, the diameter ratio of the pitch of the spiral groove 11 to the drill body 10 is preferably 3:1.
in this embodiment, the end of the turning edge 19 remote from the reinforcing edge 17 is inclined toward the drill shank 20.
With the above configuration, the cutting resistance of the rotary blade 19 can be reduced, and the cutting can be performed more smoothly.
In this embodiment, the self-tapping head 12 is provided with self-tapping threads 121.
In the above structure, the self-tapping thread 121 can provide an axial feed force when the drill bit is rotated, and can play a role in centering and stabilizing the drill feeding posture.
In this embodiment, the rear half section of the drill shank 20 away from the drill body 10 is provided with a hexagonal clamping portion 21.
In the structure, the hexagonal clamping part 21 is convenient for clamping by the drill chuck.
The utility model has the advantages that: the structure that the existing drill directly takes a spiral groove 11 as a front cutter face is eliminated, the front cutter face 14 is additionally arranged on the spiral groove 11, the front cutter face 14 is arranged to be parallel to the axis of the drill body 10, and the front angle is equal to 0 degree, so that the strength of the main cutting edge 13 is enhanced, the sharpness is ensured, and the cutting resistance of the main cutting edge 13 can be reduced by the main cutting edge 13 with a straight line structure; the main cutting edge 13 rotates by taking the axis of the drill body 10 as a center to form a circular plane, and the circular plane is perpendicular to the axis of the drill body 10, so that the flatness of the bottom of the hole can be ensured; the reinforcing edge 17 can replace the secondary cutting edge 16 of the existing drill so as to enhance the strength of a tool nose 18 formed at the joint of the main cutting edge 13 and the reinforcing edge 17; the rotary blade 19 is used for cutting and trimming the hole wall during drilling, and wood in the hole wall is cut and separated before the main cutting blade 13 cuts, so that the main cutting blade 13 can conveniently cut and remove chips, and the hole wall trimming function can be achieved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations of the above assumption should also be regarded as the protection scope of the present invention.
Claims (6)
1. The utility model provides a compound carpenter's drill bit of single-blade, includes bores the body and is located the drill shank of boring body rear end, be equipped with two helicla flutes that set up along boring body circumferential direction interval 180 degrees each other on boring the body, the helicla flute is dextrorotation, bore body front end center and be equipped with self-tapping head, its characterized in that: a main cutting edge is arranged at the junction of the groove wall of one side of the spiral groove facing to the rotating direction and the front end of the drill body, the main cutting edge is formed by butting a front cutter face and a rear cutter face, the main cutting edge formed by butting the front cutter face and the rear cutter face is a straight line, the front cutter face is parallel to the axis of the drill body, the main cutting edge rotates by taking the axis of the drill body as a center to form a circular plane and enables the circular plane to be vertical to the axis of the drill body, a reinforcing edge for connecting the auxiliary cutting edge and the main cutting edge is arranged at one end, facing to the outer cylindrical wall of the drill body, of the main cutting edge, and the reinforcing edge line is parallel to the axis of the drill body; one of the rear cutter faces is deviated towards one side of the drill shank and forms a rotary blade at the junction of the rear cutter face and the outer cylindrical wall of the drill body, and the position of a tool nose at the junction of the rotary blade and the reinforcing blade and the position of a tool nose at the junction of the other main cutting blade and the reinforcing blade are in the same rotary plane.
2. The single-blade composite woodworking drill according to claim 1, wherein: the included angle between the rear cutter face and the front cutter face is 60-85 degrees.
3. The single-blade composite woodworking drill according to claim 1, wherein: the diameter ratio of the spiral groove pitch to the drill body is 3: 0.5-1.5.
4. The single-blade composite woodworking drill bit of claim 1, wherein: and one end of the rotary blade, which is far away from the reinforced blade, inclines towards one side of the drill shank.
5. The single-blade composite woodworking drill according to claim 1, wherein: and self-tapping threads are arranged on the self-tapping head.
6. The single-blade composite woodworking drill according to claim 1, wherein: the drill handle is provided with a hexagonal clamping part at the rear half section far away from the drill body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121755859.5U CN218748342U (en) | 2021-07-29 | 2021-07-29 | Single-blade composite woodworking drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121755859.5U CN218748342U (en) | 2021-07-29 | 2021-07-29 | Single-blade composite woodworking drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218748342U true CN218748342U (en) | 2023-03-28 |
Family
ID=85642526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121755859.5U Active CN218748342U (en) | 2021-07-29 | 2021-07-29 | Single-blade composite woodworking drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218748342U (en) |
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2021
- 2021-07-29 CN CN202121755859.5U patent/CN218748342U/en active Active
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