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 extension surface of the outer side surface of the cutting edge body defines a drill bit peripheral surface, the drill bit peripheral surface is of an inverted conical structure, and the cutting edge end of the drill bit is of an arc structure and is obliquely distributed on the drill bit peripheral surface; a cylindrical drilling machining face coaxial with the drill bit is formed at the end, away from the drill rod, of the drill bit, a drill bit auxiliary chip removal space is formed between the outer side face of the cutting edge body and the drilling machining face, the drill bit auxiliary chip removal space is communicated with an auxiliary chip removal groove in the drill rod, and the drill bit auxiliary chip removal space is gradually increased in the direction from the drill bit to the drill handle. One part of wood chips generated in the drilling machining process are discharged through the main chip discharging groove, and the other part of the wood chips are discharged through the drill bit auxiliary chip discharging space and the auxiliary chip discharging groove. Compared with the prior art that a spirally extending groove is formed in the cylindrical side face of the drill bit, the machining difficulty of grinding the peripheral face of the drill bit into the inverted-cone-shaped structure is lower. The machining difficulty of the drill bit is reduced on the premise that the good chip removal effect is guaranteed.

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 creating a spirally extending groove on the cylindrical side of the drill bit, which connects to an auxiliary chip removal groove, allowing some wood chips to be discharged. However, in actual machining, creating a spirally extending groove on the cylindrical side of the drill bit presents certain machining challenges. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a four-blade woodworking drill bit that reduces the processing difficulty of the drill bit while ensuring good 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 connected in sequence to form a whole; the outer surface of the slicing edge of the drill bit extends spirally around the drill bit axis to a step, 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; the extension surface of the outer surface of the slicing edge forms the outer circumferential surface of the drill bit, the outer circumferential surface of the drill bit has an inverted conical structure, and the slicing edge of the drill bit has an arc structure and is obliquely distributed on the outer circumferential 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, and there is an auxiliary chip removal distance between the outer surface of the slicing edge and the drilling surface, the auxiliary chip removal distance of the drill bit is connected to the auxiliary chip removal groove on the drill rod, and gradually increases along the direction from the drill bit to the drill shank.

[0006] Furthermore, the cone angle α of the outer circumference of the drill bit is 4 to 6°.

[0007] Furthermore, the cone angle α of the outer circumference of the drill bit is 5°.

[0008] Furthermore, the drill bit is a cemented carbide product.

[0009] Furthermore, the drill bit and the drill rod are connected by brazing.

[0010] Compared with the prior art, the beneficial effects of this utility model are: this utility model provides a four-blade woodworking drill, which reduces the processing difficulty of the drill bit while ensuring good chip removal effect. Attached Figure Description

[0011] Figure 1 This is a perspective view of the present invention from one angle;

[0012] Figure 2 This is a perspective view of the present invention from another angle;

[0013] Figure 3 This is the front view of this utility model;

[0014] Figure 4 yes Figure 3 Enlarged view of part A in the image;

[0015] Figure 5 This is a top view of the present invention;

[0016] Figure label:

[0017] 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; 141-First platform; 142-Stepped platform; 15-Drilling surface; 151-Drill bit auxiliary chip removal spacing;

[0018] 2-Drill pipe; 21-Auxiliary chip removal flue; 22-Main chip removal flue;

[0019] 3-Drill shank; 31-Clamping plane; 32-Securing screw hole. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] 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.

[0022] The extended surface of the outer side of the slicing body 133 forms the outer peripheral surface of the drill bit. The outer peripheral surface of the drill bit has an inverted conical structure. The slicing end 131 of the drill bit 1 has an arc structure and is obliquely distributed on the outer peripheral surface of the drill bit. The end of the drill bit 1 away from the drill rod 2 forms a cylindrical drilling surface 15 arranged coaxially with the drill bit 1. There is a drill bit auxiliary chip removal spacing 151 between the outer side of the slicing body 133 and the drilling surface 15. The drill bit auxiliary chip removal spacing 151 is connected to the auxiliary chip removal groove 21 on the drill rod 2 and gradually increases along the direction from the drill bit 1 to the drill shank 3.

[0023] The outer circumference of the drill bit has an inverted conical structure, specifically meaning that the diameter of the end of the drill bit 1 connected to the drill rod 2 is small, and the diameter of the end of the drill bit 1 away from the drill rod 2 is large.

[0024] Specifically, the cutting edge 131 is located at the end of the drill bit 1 away from the drill rod 2.

[0025] The maximum width of the drill bit auxiliary chip removal spacing 151 is 0.2mm.

[0026] During drilling, some of the wood chips are discharged through the main chip removal groove 22, while the rest are discharged through the auxiliary chip removal spacing 151 and the auxiliary chip removal groove 21. In other words, the remaining wood chips naturally enter the auxiliary chip removal groove 21 through the tapered slope formed on the outer side of the cutting edge 133. Compared to the prior art where spiral grooves are created on the cylindrical side of the drill bit, grinding the outer circumference of the drill bit into an inverted conical structure is less difficult. This reduces the machining difficulty of the drill bit while ensuring good chip removal performance.

[0027] Preferably, the cone angle α of the outer circumferential surface of the drill bit is 4 to 6°. As a further preferred embodiment, the taper of the cone surface is 5°.

[0028] 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.

[0029] 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.

[0030] Example 1: The cone angle α is 4°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 4500 holes.

[0031] Example 2: The cone angle α is 5°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 5000 holes.

[0032] Example 3: The cone angle α is 6°, the wood being processed is particleboard, the drilling depth is 20mm, and the drill bit life is 4500 holes.

[0033] 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 outer side of the slicing body (133) of the drill bit (1) extends spirally around the drill bit (1) axial direction to a step 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 side of the slicing body (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 slicing body (133) forms the outer peripheral surface of the drill bit. The outer peripheral surface of the drill bit has an inverted conical structure. The slicing end (131) of the drill bit (1) has an arc structure and is obliquely distributed on the outer peripheral surface of the drill bit. The end of the drill bit (1) away from the drill rod (2) forms a cylindrical drilling surface (15) arranged coaxially with the drill bit (1). There is a drill bit auxiliary chip removal spacing (151) between the outer side of the slicing body (133) and the drilling surface (15). The drill bit auxiliary chip removal spacing (151) is connected to the auxiliary chip removal groove (21) on the drill rod (2) and gradually increases along the direction from the drill bit (1) to the drill shank (3).

2. The four-blade woodworking drill as described in claim 1, characterized in that: The cone angle α of the outer circumference of the drill bit is 4 to 6°.

3. The four-blade woodworking drill as described in claim 2, characterized in that: The cone angle α of the outer circumference of the drill bit is 5°.

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

5. 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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