Three-edge gang drill tool for woodworking

Abstract

The utility model discloses a three-edge gang drill tool for woodworking, belongs to the technical field of plate machining tools, and solves the problems that an existing gang drill tool is poor in chip removal performance and short in service life. The spiral drill comprises a cutter handle, a spiral cutting part and a drill tip, wherein the spiral cutting part comprises three groups of spiral cutting edges and spiral chip grooves; the drill tip comprises three groups of chisel edges and side edges and a central tool nose, the central tool nose is positioned on the central line of the gang drill tool, the end part of each group of spiral chip removal grooves corresponds to one group of chisel edges, and the end part of each group of spiral cutting edges corresponds to one group of side edges; the inner side face of each side edge comprises a chip removal plane, a chip removal arc face and a side edge chip removal face, the side edge chip removal faces, the chip removal arc faces and the chip removal planes are sequentially arranged in the rotating direction of the gang drill tool, the chip removal planes are tangent to the chip removal arc faces, and the chip removal arc faces are tangent to the side edge chip removal faces. According to the three-edge gang drill tool, the chip removal performance can be effectively improved, the service life of the tool is prolonged, and meanwhile burrs of drilled holes can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to plate processing cutter, more specifically, it relates to a three -edge gang drill bit for woodworking. BACKGROUND

[0002] In the processing of plate, gang drill for woodworking is usually used, and gang drill for woodworking uses gang drill bit. The traditional gang drill bit is usually two -edge cutter, and the gang drill for woodworking has poor stability during actual drilling, is easy to produce irregular vibration in radial direction, and has low service life, therefore, three -edge gang drill bit is gradually used instead.

[0003] Such as the publication number for: CN 213674574 U, the disclosure of a three -edge gang drill for blind hole for woodworking, the three -edge gang drill for blind hole for woodworking is equipped with the drill tip, the spiral cutting portion and the shank that are connected in turn. The drill tip is equipped with three groups of edge blades and cross blades that are rotationally symmetric about the center axis; the spiral cutting portion is equipped with three groups of spiral cutting blades and spiral cutting grooves that are rotationally symmetric about the center axis. The gang drill is supported in three different directions during work, effectively inhibits its radial vibration, improves the cylindricity and surface finish of the processed hole and the service life of the gang drill, each group of spiral cutting blades or edge blades has smaller cutting amount, and the generated iron filings are also smaller and easy to discharge, further improving its service life. The bottom of the shank is equipped with a threaded blind hole, and a matching adjusting screw is arranged during processing, and the height of each drill tip can be adjusted by adjusting the screwing depth of the adjusting screw, thereby solving the problem that the processing hole depth is different due to inconsistent wear degree of each drill tip after long time wear.

[0004] The above-mentioned existing gang drill bit, the inner side surface of the edge blade is a plane, so that the edge of the edge blade is a sharp structure, in the actual processing process, the sharp edge blade is easy to damage, and the chip removal is not ideal.

[0005] Therefore, a new three -edge gang drill bit for woodworking is proposed to solve the above problems. UTILITY MODEL CONTENT

[0006] The utility model solves the technical problem of the prior art, provides a three -edge gang drill bit for woodworking, which can effectively improve the chip removal performance, prolong the service life of the cutter, and reduce the burr of the drilled hole.

[0007] The utility model discloses a technical scheme is as follows: a three blade gang drill bit for woodworking, including handle, spiral cutting part and drill tip, the drill tip and handle are located at the both ends of spiral cutting part respectively, spiral cutting part includes three groups of spiral cutting edges and spiral chip flute, and one group of spiral chip flute corresponds to the one side of each group of spiral cutting edges, the drill tip includes three groups of cross blade and side blade and a center blade, the center blade is located on the center line of gang drill bit, and the end of each group of spiral chip flute corresponds to one group of cross blade, and the end of each group of spiral cutting edges corresponds to one group of side blade, the inner side of side blade includes chip plane, chip arc surface and side blade chip surface, and the side blade chip surface, chip arc surface, chip plane are sequentially arranged along the rotation direction of gang drill bit, and the chip plane is tangent to chip arc surface, and the chip arc surface is tangent to side blade chip surface.

[0008] As further improvement, the center blade is a triangular pyramid.

[0009] Further, the three angles of the bottom surface of the center blade are respectively aligned with the groove bottoms of the three groups of spiral chip flutes.

[0010] Further, the circumferential length of the side blade chip surface is greater than the circumferential length of the chip plane and the chip arc surface.

[0011] Further, the diameter of the spiral cutting edge close to the end of the drill tip is greater than the diameter away from the end of the drill tip.

[0012] Further, the height of the center blade in the feeding direction is greater than the height of the cross blade and the side blade in the feeding direction.

[0013] Further, the depth of the spiral chip flute gradually deepens along the end of the drill tip.

[0014] Further, the three groups of spiral cutting edges and spiral chip flutes, and the three groups of cross blades and side blades are uniformly distributed around the center line of the gang drill bit.

[0015] Further, the handle is provided with a flat position, and the end of the handle away from the drill tip is provided with a screw hole.

[0016] Further, the maximum diameter of the spiral cutting edge is 6mm-45mm.

[0017] Beneficial effects

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1. The three-blade gang drill cutter of the utility model, adopts the structure of three blades, can improve the stability of cutter processing, prolong the service life of the cutter, and the inner side surface of the side blade is composed of three different surfaces of chip removal plane, chip removal arc surface and side blade chip removal surface, in the process of cutting, the wood chips cut down by the side blade are guided in turn by the chip removal plane, chip removal arc surface and side blade chip removal surface, and can be better collected in the inner side of the cutter end and discharged to the spiral chip removal groove, effectively improve the chip removal performance, at the same time, the end of the side blade surface towards the rotation direction of the gang drill cutter is non-sharp structure, which is not easy to break under the cutting force, further prolongs the service life of the cutter, and can reduce the burr of the drilling hole.

[0020] 2. The three-blade gang drill cutter of the utility model, the depth of the spiral chip removal groove gradually deepens along one end of the drill tip, can greatly increase the chip removal capacity of one end of the drill tip, the wood chips cut down can be quickly discharged through the chip removal groove, further improve the chip removal effect, and the structural strength of the whole gang drill cutter is better. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0022] Figure 2 It is Figure 1 It is a structure enlarged schematic view of A in the middle;

[0023] Figure 3 It is a front view structure schematic view of the utility model;

[0024] Figure 4 It is a top view structure enlarged schematic view of the utility model;

[0025] Figure 5 It is a bottom view structure enlarged schematic view of the utility model.

[0026] Wherein: 1 - handle, 2 - spiral cutting part, 3 - drill tip, 4 - flat position, 5 - screw hole, 21 - spiral cutting edge, 22 - spiral chip removal groove, 31 - cross blade, 32 - side blade, 33 - center drill tip, 34 - chip removal plane, 35 - chip removal arc surface, 36 - side blade chip removal surface. DETAILED DESCRIPTION

[0027] The utility model will be further explained in combination with specific embodiments in the drawings.

[0028] Refer to Figures 1-5The utility model discloses a three blade gang drill bit for woodworking, including handle 1, spiral cutting portion 2 and drill tip 3, wherein, drill tip 3 and handle 1 are located at both ends of spiral cutting portion 2 respectively, spiral cutting portion 2 includes three groups of spiral cutting edges 21 and spiral chip flute 22, and one group of spiral chip flute 22 corresponds to the side of each group of spiral cutting edges 21, and the wood chips cut down can directly enter spiral chip flute 22, which is convenient for wood chip discharge.

[0029] The three blade gang drill bit has the advantages of the following: the three blade structure can improve the stability of tool machining, prolong the service life of the tool, the inner side surface of the edge blade is composed of three different surfaces of the chip removal plane, the chip removal arc surface and the edge blade chip removal surface, the wood chips cut down by the edge blade can be better collected on the inner side of the end of the tool and discharged to the spiral chip flute in the process of cutting, the chip removal performance is effectively improved, the end of the edge blade surface facing the rotating direction of the gang drill bit is a non-sharp structure, the edge blade surface is not easy to break under the cutting force, the service life of the tool is further prolonged, and the burr of the drilling hole can be reduced.

[0030] Preferably, the center blade tip 33 is a triangular pyramid, the edges of the triangular pyramid can be used as the cutting edge to further improve the cutting efficiency. Further, the three angles of the bottom surface of the center blade tip 33 are respectively aligned with the groove bottoms of the three groups of spiral chip flutes 22, and the wood chips cut down by the triangular pyramid can directly enter the spiral chip flutes 22, further improving the chip removal effect.

[0031] Preferably, the circumferential length of the edge blade chip removal surface 36 is greater than the circumferential length of the chip removal plane 34 and the chip removal arc surface 35, and the shorter chip removal plane 34 and the chip removal arc surface 35 can more quickly guide the wood chips to the edge blade chip removal surface 36.

[0032] Preferably, the diameter of the spiral cutting edge 21 close to one end of the drill tip 3 is greater than the diameter away from the other end of the drill tip 3, the spiral cutting edge 21 structure with the head diameter greater than the tail diameter is adopted, which is convenient for the feed and retreat of the gang drill bit. The maximum diameter of the spiral cutting edge 21 is 6mm-45mm.

[0033] Preferably, the height of the center tip 33 in the feeding direction is greater than the height of the chisel edge 31 and the edge 32 in the feeding direction, so as to ensure that the center tip 33 can be positioned to the workpiece.

[0034] Preferably, the depth of the spiral chip flute 22 gradually increases along one end of the drill tip 3.

[0035] In the embodiment, the depth of the spiral chip flute 22 gradually increases along one end of the drill tip, which can greatly increase the chip removal capacity of the one end of the drill tip, and the cut wood chips can be quickly removed through the chip flute, thereby further improving the chip removal effect and the structural strength of the whole drill.

[0036] Preferably, the three groups of spiral cutting edges 21 and spiral chip flutes 22, and the three groups of chisel edges 31 and edge 32 are uniformly distributed around the center line of the drill, so that the stress of the whole tool is more uniform, thereby further prolonging the service life of the tool.

[0037] Preferably, the shank 1 is provided with a flat position 4, and a screw hole 5 is formed in the end of the shank 1 away from the drill tip 3, so as to facilitate the clamping and fixing of the drill.

[0038] The preferred embodiments of the utility model are described above, and it should be pointed out that for those skilled in the art, without departing from the structure of the utility model, a number of modifications and improvements can be made, which will not affect the effect and practicality of the utility model.

Claims

1. A three-lip wood drill comprising a shank (1), a helical cutting portion (2) and a tip (3), said tip (3) and shank (1) being located at opposite ends of the helical cutting portion (2), characterised in that, The spiral cutting part (2) comprises three groups of spiral cutting edges (21) and spiral flutes (22), one side of each group of spiral cutting edges (21) corresponds to one group of spiral flutes (22); the drill tip (3) comprises three groups of chisel edges (31) and edge edges (32), and a center cutting edge (33), the center cutting edge (33) is located on the center line of the core drill, the end of each group of spiral flutes (22) corresponds to a group of chisel edges (31), and the end of each group of spiral cutting edges (21) corresponds to a group of edge edges (32); the inner side of the edge edge (32) comprises a chip removal plane (34), a chip removal arc surface (35) and an edge chip removal surface (36), the edge chip removal surface (36), the chip removal arc surface (35) and the chip removal plane (34) are sequentially arranged in the rotation direction of the core drill, and the chip removal plane (34) is tangent to the chip removal arc surface (35), and the chip removal arc surface (35) is tangent to the edge chip removal surface (36).

2. A three-lip gang drill for wood working according to claim 1, wherein The center cutting edge (33) is a triangular pyramid.

3. A three-lip gage drill for wood-working according to claim 2, characterized in that, The three corners of the bottom surface of the center cutting edge (33) are respectively aligned with the groove bottoms of the three groups of spiral flutes (22).

4. The three-lip gage drill for wood working according to claim 1, wherein, The circumferential length of the edge chip removal surface (36) is greater than the circumferential length of the chip removal plane (34) and the chip removal arc surface (35).

5. The three-lip gage drill for wood working according to claim 1, wherein, The diameter of the spiral cutting edge (21) near one end of the drill tip (3) is greater than the diameter away from one end of the drill tip (3).

6. A three-lip gang drill for wood working according to claim 1, wherein The height of the center cutting edge (33) in the feed direction is greater than the height of the chisel edge (31) and the edge edge (32) in the feed direction.

7. The three-lip gage drill for wood working according to claim 1, wherein The depth of the spiral flute (22) gradually deepens along one end of the drill tip (3).

8. A three-lip gage drill for wood working according to any one of claims 1 to 7, characterized in that, The three groups of spiral cutting edges (21) and spiral flutes (22), and the three groups of chisel edges (31) and edge edges (32) are uniformly distributed around the center line of the core drill.

9. A three-lip gage drill for wood-working according to claim 8, characterized in that, The shank (1) is provided with a flat position (4), and a screw hole (5) is formed at one end of the shank (1) away from the drill tip (3).

10. The three-lip gage drill for wood working according to claim 1, wherein, The maximum diameter of the spiral cutting edge (21) is 6mm-45mm.

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