Combined drill bit

Abstract

The utility model discloses a combined drill bit which comprises a tool bit, a drill handle and a drill rod which are coaxially and integrally connected, the tool bit is coaxially fixed at the other end of the drill rod, a first discharging groove is formed in the side face of the tool bit, a second discharging groove matched with the first discharging groove is formed in the drill rod, and a receding groove and a cutting face which are connected with each other are arranged on the side face of the tool bit. The cutting face is arranged between the receding groove and the first discharging groove, the diameter of the cutting face is larger than that of the bottom of the receding groove, and the diameter of the bottom of the receding groove is not smaller than that of the drill rod. The receding groove and the cutting face are arranged on the tool bit, the diameter of the cutting face is larger than that of the bottom of the receding groove, and the diameter of the bottom of the receding groove is not smaller than that of the drill rod, so that in the machining process of the drill bit, the drill rod cannot make contact with the hole wall of wood, friction force does not exist between the drill rod and the hole wall, and heat generated in the use process of the drill bit can be effectively reduced; and the processing quality can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of drill bits, in particular to a combined drill bit. Background Art

[0002] A drill is generally used for drilling holes in wood. However, in the prior art, the diameter of the drill head and the middle shaft are the same. During the drilling process, there is a large friction between the shaft and the hole in the wood, which reduces the drilling speed of the drill, ultimately reducing the drilling efficiency and the quality of the drilling. Utility Model Content

[0003] The utility model aims to overcome the deficiencies of the prior art and provide a combined drill bit.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A combined drill bit comprises a drill shank, a drill rod and a cutter head, wherein the drill shank is coaxially connected to the drill rod, the cutter head is coaxially fixed to the other end of the drill rod, a first material discharge groove is arranged on the side of the cutter head, a second material discharge groove cooperating with the first material discharge groove is arranged on the drill rod, and mutually connected air avoidance grooves and cutting surfaces are arranged on the side of the cutter head, the cutting surface is arranged between the air avoidance groove and the first material discharge groove, the diameter of the cutting surface is larger than the diameter of the bottom of the air avoidance groove, and the bottom diameter of the air avoidance groove is not smaller than the diameter of the drill rod.

[0006] Furthermore, a spherical groove is provided at the end of the drill rod, and a spherical end head matching with the spherical groove is provided at the end of the cutter head.

[0007] Furthermore, the spherical groove and the spherical end head are fixedly connected by welding.

[0008] Furthermore, the first discharge groove and the second discharge groove are both spiral grooves.

[0009] Furthermore, the surface where the air-avoiding groove is located and the surface where the cutting surface is located are both cylindrical surfaces, and the air-avoiding groove and the cutting surface are coaxially arranged.

[0010] Furthermore, at least two of the first discharge grooves are evenly arranged on the side surface of the cutter head.

[0011] Furthermore, a positioning plane is provided on the side surface of the drill shank.

[0012] Furthermore, a transition slope is provided between the avoidance groove and the cutting surface.

[0013] Furthermore, the end of the cutter head is provided with a discharge end face, a connecting end face and a cutting end face, the connecting end face is connected between the discharge end face and the connecting end face, the cutting face cooperates with the cutting end face, and the discharge end face and the connecting end face both cooperate with the air avoidance groove.

[0014] Furthermore, the inclination angle of the connecting end face is greater than that of the cutting end face and smaller than that of the discharging end face.

[0015] The beneficial effects of the utility model are:

[0016] 1) In this technology, an air avoidance groove and a cutting surface are set on the cutter head. The diameter of the cutting surface is larger than the diameter of the bottom of the air avoidance groove, and the bottom diameter of the air avoidance groove is not smaller than the diameter of the drill rod. In this way, during the processing of the drill bit, the drill rod will not contact the hole wall of the wood, and there is no friction between the two. The heat generated during the use of the drill bit can be effectively reduced, and the processing quality can be guaranteed.

[0017] 2) In the present technology, both the first discharge chute and the second discharge chute are spiral chute, which is convenient for quickly discharging wood chips during processing.

[0018] 3) In this technology, the drill rod and the cutter head are connected by welding, which facilitates the processing and manufacturing of the entire drill head. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The three-dimensional structure of this drill bit Figure 1 ;

[0020] Figure 2 The three-dimensional structure of this drill bit Figure 2 ;

[0021] Figure 3 This is a structural diagram of the drill rod and cutter head being separated;

[0022] Figure 4 This is a side view of the drill bit;

[0023] In the figure, 1-drill handle, 2-drill rod, 3-cutter head, 4-first discharge groove, 5-second discharge groove, 6-avoidance groove, 7-cutting surface, 8-spherical groove, 9-spherical end, 10-positioning plane, 11-transition slope, 12-discharge end face, 13-connecting end face, 14-cutting end face. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-Figure 4 , the utility model provides a technical solution:

[0026] A combined drill bit includes a drill shank 1, a drill rod 2 and a cutter head 3. The drill shank 1 is coaxially connected to the drill rod 2, and the cutter head 3 is coaxially fixed to the other end of the drill rod 2. A first discharge groove 4 is provided on the side of the cutter head 3, and a second discharge groove 5 cooperating with the first discharge groove 4 is provided on the drill rod 2. An air avoidance groove 6 and a cutting surface 7 connected to each other are provided on the side of the cutter head 3. The cutting surface 7 is provided between the air avoidance groove 6 and the first discharge groove 4. The diameter of the cutting surface 7 is greater than the diameter of the bottom of the air avoidance groove 6, and the bottom diameter of the air avoidance groove 6 is not less than the diameter of the drill rod 2. Both the first discharge groove 4 and the second discharge groove 5 are spiral grooves. Among them, the diameter of the cutting surface 7 in the present technology is greater than the diameter of the air avoidance groove 6, and the diameter of the air avoidance groove 6 is greater than the diameter of the drill rod 2. The first discharge groove 4 is used to discharge wood chips, and a side cutting edge is formed between the first discharge groove 4 and the cutting surface 7, and the cutting edge processes the side wall of the hole. The wood chips in the first discharge groove 4 are discharged to the outside through the second discharge groove 5.

[0027] In some embodiments, the end of the drill rod 2 is provided with a spherical groove 8, and the end of the cutter head 3 is provided with a spherical end head 9 that matches the spherical groove 8. The spherical groove 8 and the spherical end head 9 are fixedly connected by welding. Among them, the separate design of the drill rod 2 and the cutter head 3 has three advantages. First, it is convenient for each part to be processed and manufactured; second, when the cutter head 3 is broken, the broken cutter head 3 can be removed from the drill rod 2 and replaced with a new cutter head 3; third, the performance requirements of the drill rod 2 and the cutter head 3 are different. For example, the toughness requirement of the drill rod 2 is better, and the tolerance requirement of the cutter head 3 is higher. In this way, the drill rod 2 and the cutter head 3 can be produced with different materials and then welded, which can better meet the performance requirements of the drill bit.

[0028] In some embodiments, the surface where the air-avoiding groove 6 is located and the surface where the cutting surface 7 is located are both cylindrical surfaces, and the air-avoiding groove 6 is coaxially arranged with the cutting surface 7. Among them, the outer surface of the air-avoiding groove 6 is a cylindrical surface, the outer surface of the cutting surface 7 is a cylindrical surface, the air-avoiding groove 6 is coaxially arranged with the cutting surface 7, and the air-avoiding groove 6 is coaxially arranged with the drill rod 2.

[0029] In some embodiments, at least two first discharge grooves 4 are evenly arranged on the side of the cutter head 3. The number of the first discharge grooves 4 can be two, three, or four, but at least one is arranged, and too many cannot be arranged. If too many are arranged, it will be difficult to discharge the wood chips. The drill rod 2 is provided with the same number of second discharge grooves 5 that match the number of first discharge grooves 4 arranged on the cutter head 3.

[0030] In some embodiments, a positioning plane 10 is provided on the side of the drill handle 1. The positioning plane 10 facilitates the installation and clamping of the drill bit by the equipment using the drill bit, and also prevents the drill bit from rotating on the clamping equipment during the processing, thereby avoiding the drill bit from being unable to process normally.

[0031] In some embodiments, a transition slope 11 is provided between the air-avoiding groove 6 and the cutting surface 7. The transition slope 11 is used to connect the air-avoiding groove 6 and the cutting surface 7, which can effectively prevent wood chips from getting stuck at the transition slope 11.

[0032] In some embodiments, the end of the cutter head 3 is provided with a discharge end face 12, a connection end face 13 and a cutting end face 14, the connection end face 13 is connected between the discharge end face 12 and the connection end face 13, the cutting face 7 cooperates with the cutting end face 14, and the discharge end face 12 and the connection end face 13 both cooperate with the air avoidance groove 6. The inclination angle of the connection end face 13 is greater than the inclination angle of the cutting end face 14 and less than the inclination angle of the discharge end face 12. Among them, two first discharge grooves 4 are arranged on the cutter head 3, the cutting end face 14 cooperates with one first discharge groove 4, the discharge end face 12 cooperates with the other first discharge groove 4, the connecting end face 13 is arranged between the discharge end face 12 and the connecting end face 13, the tip of the cutter head 3 is arranged on the axis of the cutter head 3 and protrudes outward from the end, the inclination angles of the discharge end face 12, the connecting end face 13 and the cutting end face 14 refer to the angles between the discharge end face 12, the connecting end face 13 and the cutting end face 14 and the end face of the cutter head 3 respectively, and the end face of the cutter head 3 is perpendicular to the axis of the cutter head 3. The cutting end face 14 forms an end cutting edge with the first discharge groove 4 and the discharge end face 12.

[0033] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation", "hinge" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0035] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A combined drill bit, characterized in that: The drill shank (1), a drill rod (2) and a cutter head (3), wherein the drill shank (1) is coaxially connected to the drill rod (2), the cutter head (3) is coaxially fixed to the other end of the drill rod (2), a first material discharge groove (4) is arranged on the side of the cutter head (3), a second material discharge groove (5) cooperating with the first material discharge groove (4) is arranged on the drill rod (2), and a mutually connected air avoidance groove (6) and a cutting surface (7) are arranged on the side of the cutter head (3), the cutting surface (7) is arranged between the air avoidance groove (6) and the first material discharge groove (4), the diameter of the cutting surface (7) is larger than the diameter of the bottom of the air avoidance groove (6), and the bottom diameter of the air avoidance groove (6) is not smaller than the diameter of the drill rod (2).

2. A combined drill bit according to claim 1, characterized in that: The end of the drill rod (2) is provided with a spherical groove (8), and the end of the cutter head (3) is provided with a spherical end head (9) that matches the spherical groove (8).

3. A combined drill bit according to claim 2, characterized in that: The spherical groove (8) and the spherical end head (9) are fixedly connected by welding.

4. A combined drill bit according to any one of claims 1 to 3, characterized in that: The first discharge groove (4) and the second discharge groove (5) are both spiral grooves.

5. A combined drill bit according to any one of claims 1 to 3, characterized in that: The surface where the air-avoiding groove (6) is located and the surface where the cutting surface (7) is located are both cylindrical surfaces, and the air-avoiding groove (6) and the cutting surface (7) are coaxially arranged.

6. A combined drill bit according to any one of claims 1 to 3, characterized in that: At least two first discharge grooves (4) are evenly arranged on the side surface of the cutter head (3).

7. A combined drill bit according to any one of claims 1 to 3, characterized in that: A positioning plane (10) is provided on the side surface of the drill shank (1).

8. A combined drill bit according to any one of claims 1 to 3, characterized in that: A transition slope (11) is provided between the avoidance groove (6) and the cutting surface (7).

9. A combined drill bit according to any one of claims 1 to 3, characterized in that: The end of the cutter head (3) is provided with a discharge end face (12), a connection end face (13) and a cutting end face (14); the connection end face (13) is connected between the discharge end face (12) and the connection end face (13); the cutting face (7) cooperates with the cutting end face (14); and the discharge end face (12) and the connection end face (13) both cooperate with the air avoidance groove (6).

10. A combined drill bit according to claim 9, characterized in that: The inclination angle of the connecting end surface (13) is greater than the inclination angle of the cutting end surface (14) and smaller than the inclination angle of the discharge end surface (12).

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