Four-edge woodworking gang drill

Abstract

The utility model belongs to the technical field of woodworking tools, and particularly relates to a four-edge woodworking gang drill. The peripheral surface of the drill bit is ground into a first peripheral chip removal section and a second peripheral chip removal section which are adjacently arranged and are of an inverted conical structure, and a drainage groove is formed. Compared with the prior art that a spirally extending groove is formed in the cylindrical side face of the drill bit, the chip removal effect can be further improved.

Description

Technical Field

[0001] This utility model belongs to the field of woodworking tool technology, specifically relating to a four-bladed woodworking drill. Background Technology

[0002] A wood drill is a tool used to drill holes in wood. When drilling, a wood drill produces a lot of sawdust, which, if not removed in time, can easily cause technical problems such as overheating and jamming of the drill bit.

[0003] Chinese patent document CN206484687U discloses a four-flute crown drill. The above technical solution involves setting a spirally extending groove on the cylindrical side of the drill bit, which is connected to an auxiliary chip removal groove, allowing some wood chips to be discharged through both the groove and the auxiliary chip removal groove. However, due to the relatively small chip removal capacity of the groove, there is a technical problem of unsatisfactory chip removal effect. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a four-blade woodworking drill to further improve the chip removal effect.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a four-blade woodworking drill, including a drill bit, a drill rod, and a drill shank, wherein the drill bit, drill rod, and drill shank are sequentially connected to form a whole; the main cutting edge of the drill bit and the slicing edge of the drill bit form a first platform on the circumferential plane of the drill bit; the outer surface of the slicing edge extends spirally to the platform around the drill bit axis and is arranged correspondingly to the auxiliary chip removal groove of the drill rod; the spiral extension direction of the outer surface of the slicing edge is consistent with the spiral extension direction of the auxiliary chip removal groove; characterized in that: the extension surface of the outer surface of the slicing edge forms the outer circumferential surface of the drill bit, and the outer circumferential surface of the drill bit includes a first outer circumferential chip removal section and a second outer circumferential chip removal section arranged adjacent to each other along the direction from the drill bit to the drill rod, wherein both the first outer circumferential chip removal section and the second outer circumferential chip removal section have an inverted conical structure. The cone angle α of the first outer peripheral chip removal section is smaller than the cone angle β of the second outer peripheral chip removal section; the slicing edge of the drill bit has an arc structure and is obliquely distributed on the first outer peripheral chip removal section of the outer peripheral surface of the drill bit; the end of the drill bit away from the drill rod forms a cylindrical drilling surface arranged coaxially with the drill bit; there is an auxiliary chip removal spacing between the outer peripheral surface of the drill bit and the drilling surface; the auxiliary chip removal spacing is connected to the auxiliary chip removal groove on the drill rod and increases along the direction from the drill bit to the drill rod; a drainage groove is provided on the outer side of the slicing edge, the drainage groove is consistent with the spiral extension direction of the outer side of the slicing edge, the slag inlet end of the drainage groove corresponds to and is connected to the edge of the first platform, and the slag outlet end of the drainage groove is located between the two ends in the height direction of the second outer peripheral chip removal section.

[0006] Furthermore, the cone angle α of the first outer peripheral chip removal section is 3 to 5°.

[0007] Furthermore, the cone angle α of the first outer peripheral chip removal section is 4°.

[0008] Furthermore, the cone angle β of the second outer peripheral chip removal section is 16–20°.

[0009] Furthermore, the cone angle β of the second outer peripheral chip removal section is 18°.

[0010] Furthermore, the drill bit is a cemented carbide product.

[0011] Furthermore, the drill bit and the drill rod are connected by brazing.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a four-blade woodworking drill bit, which further improves the chip removal effect. This is achieved by grinding the outer circumferential surface of the drill bit into adjacent, inverted conical chip removal sections (first and second outer circumferential sections) and by creating drainage grooves. Compared to the prior art where spirally extending grooves are created on the cylindrical side of the drill bit, this further improves the chip removal effect. Attached Figure Description

[0013] Figure 1 This is a perspective view of the present invention from one angle;

[0014] Figure 2 yes Figure 1 Enlarged view of part A in the image;

[0015] Figure 3 This is the front view of this utility model;

[0016] Figure 4 yes Figure 3 Enlarged view of part B in the image;

[0017] Figure 5 This is a perspective view of the present invention from another angle;

[0018] Figure label:

[0019] 1-Drill bit; 11-Drill tip; 12-Main cutting edge; 121-Main cutting edge end; 122-Main cutting edge tip; 123-Main cutting edge body; 13-Splitting edge; 131-Splitting edge end; 132-Splitting edge tip; 133-Splitting edge body; 134-First outer peripheral chip removal section; 135-Second outer peripheral chip removal section; 141-First platform; 142-Stepped platform; 15-Drilling surface; 151-Drill bit auxiliary chip removal spacing; 16-Drainage groove;

[0020] 2-Drill pipe; 21-Auxiliary chip removal flue; 22-Main chip removal flue;

[0021] 3-Drill shank; 31-Clamping plane; 32-Securing screw hole. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] As cited in the background section, Chinese patent document CN206484687U describes an existing four-flute woodworking drill bit, comprising a drill bit 1, a drill rod 2, and a drill shank 3, which are sequentially connected as a whole. The drill bit 1 has a centrally symmetrical structure, containing a drill tip 11, two main cutting edges 12, two scouring edges 13, and a step 142. The main cutting edges 12 and scouring edges 13 are alternately distributed at the bottom of the drill bit 1. The drill tip 11 has a pyramidal structure and is located at the center of the drill bit 1. The step 142 is located at the connection surface between the drill bit 1 and the drill rod 2. Two main cutting edges 12 are centrally symmetrically distributed at the bottom of the drill bit 1 with the drill tip 11 as the center. Each edge includes a main cutting end 121, a main cutting tip 122, and a main cutting body 123. The main cutting end 121 has an arc structure and extends outward from the drill tip 11 to the outer circumference of the drill bit 1. The main cutting tip 122 is located at the outermost end of the main cutting end 121, i.e., distributed on the outer circumference of the drill bit 1. The main cutting body 123 is connected to the main cutting end 121, and its outer surface extends spirally to the step 142. Two scouring edges 13 are centrally symmetrically distributed at the bottom of the drill bit 1 with the drill tip 11 as the center. Each edge includes a scouring end 131, a scouring tip 132, and a scouring body 133. The scouring tip 132 is located at the highest point of the scouring end 131. The scouring body 133 is connected to the scouring end 131, and its outer surface extends spirally around the drill bit 1 to the step 142. The main cutting edge 123 and the slicing edge 133 form a first platform 141 on the circumferential plane of the drill bit 1. The drill rod 2 is a rod structure containing two main chip removal grooves 22 and two auxiliary chip removal grooves 21, which are distributed alternately and spirally arranged. One end of the main chip removal groove 22 extends to the platform 142 and corresponds to the position of the main cutting edge 123, while the other end of the main chip removal groove 22 spirally extends to the bottom of the drill shank 3. One end of the auxiliary chip removal groove 21 extends to the platform 142 and corresponds to the slicing edge 133, while the other end of the auxiliary chip removal groove 21 spirally extends to the bottom of the drill shank 3. The drill shank 3 is a cylindrical structure containing a clamping plane 31 and a fastening screw hole 32. The clamping plane 31 is located on the cylindrical side of the drill shank 3 and is vertically distributed. The height of the clamping plane 31 is the same as the height of the drill shank 3 and the bottom is opposite to the end of one of the auxiliary chip removal grooves 21. The fastening screw hole 32 is located at the central axial position of the drill shank 3 and at the end of the drill shank 3 away from the drill rod 2.

[0024] The extended surface of the outer side of the cutting edge 133 forms the outer peripheral surface of the drill bit. The outer peripheral surface of the drill bit includes a first outer peripheral chip removal section 134 and a second outer peripheral chip removal section 135 arranged adjacent to each other along the direction from the drill bit 1 to the drill rod 2. Both the first outer peripheral chip removal section 134 and the second outer peripheral chip removal section 135 have an inverted conical structure. The cone angle α of the first outer peripheral chip removal section 134 is smaller than the cone angle β of the second outer peripheral chip removal section 135. The cutting edge 131 of the drill bit 1 has an arc structure and is obliquely distributed on the first outer peripheral chip removal section 134 of the outer peripheral surface of the drill bit. The end of the drill bit 1 away from the drill rod 2 is arranged coaxially with the drill bit 1. A cylindrical drilling surface 15 is provided. The outer peripheral surface of the drill bit and the drilling surface 15 have an auxiliary chip removal spacing 151. The auxiliary chip removal spacing 151 is connected to the auxiliary chip removal groove 21 on the drill rod 2 and increases along the direction from the drill bit 1 to the drill rod 2. A flow channel 16 is provided on the outer side of the cutting edge 133. The flow channel 16 is consistent with the spiral extension direction of the outer side of the cutting edge 133. The slag inlet end of the flow channel 16 corresponds to and is connected to the edge of the first platform 141. The slag outlet end of the flow channel 16 is located between the two ends in the height direction of the second outer peripheral chip removal section 135.

[0025] Both the first outer peripheral chip removal section 134 and the second outer peripheral chip removal section 135 have an inverted conical structure. Specifically, the diameter of the first outer peripheral chip removal section 134 near the drill pipe 2 is smaller than the diameter of the first outer peripheral chip removal section 134 away from the drill pipe 2, and the diameter of the second outer peripheral chip removal section 135 near the drill pipe 2 is smaller than the diameter of the second outer peripheral chip removal section 135 away from the drill pipe 2.

[0026] The slag discharge end of the diversion channel 16 is located between the two ends of the second outer peripheral chip removal section 135 in the height direction. Specifically, the slag discharge end of the diversion channel 16 is located between the two ends of the second outer peripheral chip removal section 135 along the axial direction of the drill bit 1.

[0027] Specifically, the cutting edge 131 is located at the end of the drill bit 1 away from the drill rod 2.

[0028] Because the cone angle α of the first outer peripheral chip removal section 134 is smaller than the cone angle β of the second outer peripheral chip removal section 135, the chip removal space of the section corresponding to the first outer peripheral chip removal section 134 in the drill bit auxiliary chip removal spacing 151 is smaller than the chip removal space of the section corresponding to the second outer peripheral chip removal section 135. The junction C between the first outer peripheral chip removal section 134 and the second outer peripheral chip removal section 135 is located between the slag inlet end and the slag outlet end of the diversion channel 16.

[0029] During drilling, wood chips are discharged in several ways: some are discharged through the main chip removal groove 22, some through the first outer peripheral chip removal section 134, the second outer peripheral chip removal section 135, the auxiliary chip removal groove 21, and the main chip removal groove 22; and some through the diversion groove 16, the second outer peripheral chip removal section 135, the auxiliary chip removal groove 21, and the main chip removal groove 22. By grinding the outer peripheral surface of the drill bit into adjacent, inverted conical structures for the first and second outer peripheral chip removal sections 134 and 135, and by creating the diversion groove 16, the chip removal efficiency is further improved compared to the prior art technique of creating spirally extending grooves on the cylindrical side of the drill bit.

[0030] Preferably, the cone angle α of the first outer peripheral chip removal section 134 is 3 to 5°. As a further preferred embodiment, the cone angle α of the first outer peripheral chip removal section 134 is 4°.

[0031] Preferably, the cone angle β of the second outer peripheral chip removal section 135 is 16-20°. As a further preferred embodiment, the cone angle β of the second outer peripheral chip removal section 135 is 18°.

[0032] Preferably, drill bit 1 is a cemented carbide product. As a further preferred option, the cemented carbide material used in drill bit 1 is mainly composed of tungsten carbide.

[0033] Preferably, the drill bit 1 and the drill rod 2 are connected by brazing. The brazing filler metal used is a copper-based and / or silver-based alloy.

[0034] Example 1: The cone angle α is 3°, β is 16°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 5500 holes.

[0035] Example 2: The cone angle α is 3°, β is 18°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 5800 holes.

[0036] Example 3: The cone angle α is 3°, β is 20°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 5500 holes.

[0037] Example 4: The cone angle α is 4°, β is 16°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 6000 holes.

[0038] Example 5: The cone angle α is 4°, β is 18°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 6200 holes.

[0039] Example 6: The cone angle α is 4°, β is 20°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 6000 holes.

[0040] Example 7: The cone angle α is 5°, β is 16°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 5500 holes.

[0041] Example 8: The cone angle α is 5°, β is 18°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 5800 holes.

[0042] Example 9: The cone angle α is 5°, β is 20°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 5500 holes.

[0043] The specific embodiments described are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. All equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A four-blade woodworking drill, comprising a drill bit (1), a drill rod (2), and a drill shank (3), wherein the drill bit (1), drill rod (2), and drill shank (3) are sequentially connected as a whole; the main cutting edge (123) of the drill bit (1) and the slicing edge (133) of the drill bit (1) form a first platform (141) on the circumferential plane of the drill bit (1); the outer surface of the slicing edge (133) extends spirally around the axial direction of the drill bit (1) to a platform (142), and is arranged correspondingly to the auxiliary chip removal groove (21) of the drill rod (2); the spiral extension direction of the outer surface of the slicing edge (133) is consistent with the spiral extension direction of the auxiliary chip removal groove (21); characterized in that: The extended surface of the outer side of the cutting edge (133) forms the outer peripheral surface of the drill bit. The outer peripheral surface of the drill bit includes a first outer peripheral chip removal section (134) and a second outer peripheral chip removal section (135) arranged adjacent to each other along the direction from the drill bit (1) to the drill rod (2). Both the first outer peripheral chip removal section (134) and the second outer peripheral chip removal section (135) have an inverted conical structure. The cone angle α of the first outer peripheral chip removal section (134) is smaller than the cone angle β of the second outer peripheral chip removal section (135). The cutting edge (131) of the drill bit (1) has an arc structure and is obliquely distributed on the first outer peripheral chip removal section (134) of the outer peripheral surface of the drill bit. The end of the drill bit (1) away from the drill rod (2) forms a circle arranged coaxially with the drill bit (1). A cylindrical drilling surface (15) is provided. The outer peripheral surface of the drill bit and the drilling surface (15) have a drill bit auxiliary chip removal spacing (151). The drill bit auxiliary chip removal spacing (151) is connected to the auxiliary chip removal groove (21) on the drill rod (2) and increases along the direction from the drill bit (1) to the drill rod (2). A flow channel (16) is provided on the outer side of the cutting edge (133). The flow channel (16) is consistent with the spiral extension direction of the outer side of the cutting edge (133). The slag inlet end of the flow channel (16) corresponds to and is connected to the edge of the first platform (141). The slag outlet end of the flow channel (16) is located between the two ends in the height direction of the second outer peripheral chip removal section (135).

2. The four-blade woodworking drill as described in claim 1, characterized in that: The cone angle α of the first outer peripheral chip removal section (134) is 3 to 5°.

3. The four-blade woodworking drill as described in claim 2, characterized in that: The cone angle α of the first outer peripheral chip removal section (134) is 4°.

4. The four-blade woodworking drill as described in any one of claims 1-3, characterized in that: The cone angle β of the second outer peripheral chip removal section (135) is 16-20°.

5. The four-blade woodworking drill as described in claim 4, characterized in that: The cone angle β of the second outer peripheral chip removal section (135) is 18°.

6. The four-blade woodworking drill as described in claim 1, characterized in that: The drill bit (1) is a cemented carbide product.

7. The four-blade woodworking drill as described in claim 1, characterized in that: The drill bit (1) and the drill rod (2) are connected by brazing.

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