CN215549431U

CN215549431U - Composite woodworking drill bit

Info

Publication number: CN215549431U
Application number: CN202121773455.9U
Authority: CN
Inventors: 黄林森
Original assignee: Yueqing Hengcang Tools Co ltd
Current assignee: Yueqing Hengcang Tools Co ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2022-01-18
Anticipated expiration: 2031-07-29

Abstract

The utility model provides a composite woodworking drill bit which comprises a drill body and a drill handle, wherein two spiral grooves are formed in 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. The metal nail cutting machine has the advantages of high structural strength, good wear resistance and long service life, and can effectively protect the main cutting edge and cut off the metal nail when the metal nail is drilled.

Description

Composite woodworking drill bit

Technical Field

The utility model relates to the field of woodworking drills, in particular to a composite woodworking drill.

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 above problems, the utility model aims to provide a composite wood drill which has high structural strength, good wear resistance and long service life, and can effectively protect a main cutting edge and cut off a metal nail when the metal nail is drilled.

Aiming at the problems, the following technical scheme is provided: the utility model provides a compound carpenter's drill bit, includes the drill stem that bores the body and be located drill body rear end, be equipped with two helicla flutes that set up along drill body circumferential direction interval 180 degrees each other on the drill body, the helicla flute is the dextrorotation, drill body front end center is equipped with the head of attacking one's head, the helicla flute is equipped with main cutting edge towards the cell wall of direction of rotation one side and drill body front end juncture, main cutting edge forms through rake face and back knife face butt joint, the main cutting edge that rake face and back knife face butt joint formed is a straight line, the rake face is parallel with the drill body axis, main cutting edge uses the drill body axis to form a circular plane and makes this circular plane and drill body axis perpendicular as the rotation of center, main cutting edge is equipped with the enhancement sword of connecting vice cutting edge and main cutting edge towards the one end of drill body outer cylinder wall, it is parallel with the drill body axis to strengthen the sword line.

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 as to ensure the flatness of the bottom of the hole; the reinforcing blade can replace the secondary 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 utility model is further arranged that the included angle between the flank face and the rake face is between 60 degrees and 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, that is, the clearance angle of the flank face is 5 to 30 degrees, so that the strength and rigidity of the main cutting edge can be effectively ensured.

The utility model is further arranged that the diameter ratio of the pitch of the spiral groove to the drill body is 3: 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 is further provided that the tapping head is provided with tapping threads.

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 is further provided that the rear half section of the drill handle, which is far away from the drill body, is provided with a hexagonal clamping part.

In the structure, the hexagonal clamping part is convenient for the drill chuck to clamp.

The utility model has the beneficial effects 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 secondary 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.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention when two main cutting edges are disposed at 180 degrees.

Fig. 2 is a schematic front projection structure view of the main cutting edge of fig. 1.

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 overall structure of the present invention when the main cutting edge is a single line.

Fig. 5 is a schematic view of an orthographic projection of the main cutting edge of fig. 4 according to the present invention.

Fig. 6 is an enlarged schematic view of the part B of fig. 4 according to the present invention.

FIG. 7 is a schematic view of the angle and relief structure of FIG. 6 according to 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 embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

Referring to fig. 1 to 7, a composite wood drill shown in fig. 1 to 7 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 flutes 11 spaced 180 degrees apart from each other along the circumferential direction of the drill body 10, the spiral flutes 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 provided at the boundary between the flute wall of one side of the spiral flute 11 facing the rotation direction and the front end of the drill body 10, the main cutting edge 13 is formed by abutting a rake surface 14 and a flank surface 15, the main cutting edge 13 formed by abutting 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 about the axis of the drill body 10 to form a circular plane and make the circular plane 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 auxiliary cutting edge 16 and the main cutting edge 13, the edge line of the reinforced edge 17 is parallel to the axis of the drill body 10.

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 to enhance the strength of the tip 18 formed at the joint of the main cutting edge 13 and the reinforcing edge 17.

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 wedge angle β in the technical term) between the flank face and the rake face is 60 to 85 degrees, that is, the clearance angle a2 of the flank face 15 is 5 to 30 degrees, 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, one flank surface 15 'is shifted toward the drill shank 20 and forms a turning edge 19 at the boundary between the flank surface 15 and the outer cylindrical wall of the drill body 10, and the position of the nose 18' at the boundary between the turning edge 19 and the reinforcing edge 17 and the nose 18 at the boundary between the other main cutting edge 13 and the reinforcing edge 17 are in the same turning plane.

In the above structure, the rotary blade 19 is used for cutting and trimming the hole wall during drilling, and the 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 rotary blade can play a role in trimming the hole wall,

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 beneficial effects 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 to enhance the strength of the tip 18 formed at the joint of the main cutting edge 13 and the reinforcing edge 17.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and those modifications and variations assumed in the above are also considered to be within the protective scope of the present invention.

Claims

1. The utility model provides a compound carpenter's drill bit, includes bores the body and is located the drill handle 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 is equipped with self-tapping head, its characterized in that: the cell wall of helicla flute one side is equipped with main cutting edge with boring body front end juncture towards direction of rotation, main cutting edge forms through rake face and back knife face butt joint, the main cutting edge that rake face and back knife face butt joint formed is a straight line, the rake face is parallel with boring body axis, main cutting edge uses boring body axis to form a circular plane and makes this circular plane perpendicular with boring body axis as the rotation of center, 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, it is parallel with boring body axis to strengthen sword line.

2. A composite woodworking drill bit as claimed in claim 1, wherein: the included angle between the rear cutter face and the front cutter face is 60-85 degrees.

3. A composite woodworking drill bit as claimed in claim 1, wherein: the diameter ratio of the spiral groove pitch to the drill body is 3: 0.5-1.5.

4. A composite woodworking drill bit as claimed in claim 1, wherein: and the self-tapping head is provided with self-tapping threads.

5. A composite woodworking drill bit as claimed in claim 1, wherein: the drill handle is provided with a hexagonal clamping part at the rear half section far away from the drill body.