A drill bit

Abstract

This utility model discloses a drilling tool, including a cutting head, a shank, and a positioning element. The cutting head has a protrusion that protrudes beyond its end face. The shank has a receiving groove on its peripheral wall, extending axially through the end of the shank facing the cutting head. The receiving groove corresponds to the protrusion, which is located within the receiving groove and abuts against one side wall of the receiving groove extending axially along the shank. A gap exists between the protrusion and the other side wall of the receiving groove extending axially along the shank. The positioning element is located within the gap and abuts against both the protrusion and the other side wall of the receiving groove extending axially along the shank. With this structure, by positioning the protrusion within the receiving groove, the connection position between the cutting head and the shank is positioned. The positioning element, located within the gap formed by the protrusion and the receiving groove, ensures a tight fit between the cutting head and the shank, thereby increasing the connection strength between them.

Description

Technical Field

[0001] This utility model relates to the field of machining tool technology, and in particular to a drilling tool. Background Technology

[0002] Drilling tools consist of a cutting head and a shank. The cutting head is used for drilling, and the shank is used to mount the cutting head. In existing drilling tools, the fixing between the cutting head and the shank is unstable, which can easily lead to misalignment between the cutting head and the shank, posing a safety hazard.

[0003] A utility model patent with authorization announcement number CN207239235U discloses a drilling tool, which includes a tool holder, a cutting head fixedly connected to the tool holder by a first bolt, and a cutting blade fixedly connected to the cutting head. The cutting head has a positioning element that abuts against the first bolt, and a positioning groove for placing the positioning element. An elastic contact element is provided at the end of the positioning element away from the first bolt, and a fixing block that threadedly engages with the positioning groove is provided at the end of the elastic contact element away from the positioning element. When the cutting head is securely fixed to the tool holder, the positioning element pops out of the positioning groove and abuts against the side of the first bolt away from the tool holder.

[0004] The above technical solution uses the combination of positioning components and arc grooves to connect and fix the cutter head and the cutter shank. Although it can increase the firmness of the connection between the cutter head and the cutter shank, the overall structure is complex and inconvenient to install and disassemble. Utility Model Content

[0005] In view of this, the present invention proposes a drilling tool with a simple structure that can achieve a stable connection between the cutting head and the tool holder, so as to solve the problems of complex assembly structure and inconvenient disassembly and assembly in the existing solution.

[0006] The technical solution of this utility model is achieved as follows: This utility model provides a drilling tool, including a tool head, a tool holder, and a positioning element; wherein,

[0007] The cutter head is provided with a protrusion that protrudes beyond the end face of the cutter head;

[0008] The tool holder has a receiving groove on its peripheral wall, which extends through the end of the tool holder towards the tool tip along the axial direction of the tool holder.

[0009] The receiving groove and the protrusion are correspondingly provided. The protrusion is located in the receiving groove and abuts against one side wall of the receiving groove that extends along the axial direction of the tool holder. A gap is left between the protrusion and the other side wall of the receiving groove that extends along the axial direction of the tool holder.

[0010] The positioning element is located within the gap, and it abuts against the protrusion and the other side wall of the receiving groove that extends along the axial direction of the tool holder.

[0011] Based on the above technical solutions, preferably, the tool holder has a first connecting hole, which extends radially along the tool holder;

[0012] The positioning component has a second connecting hole, which corresponds to the first connecting hole. The first and second connecting holes are connected to the same fastener so that the positioning component is fixedly connected to the tool holder.

[0013] Based on the above technical solutions, the preferred positioning component is a four-sided pyramidal structure with rounded chamfered edges.

[0014] Based on the above technical solutions, preferably, the two side walls of the positioning member along the circumference of the tool holder abut against the side wall of the receiving groove along the circumference of the tool holder and the end face of the cutting head facing the tool holder.

[0015] Based on the above technical solutions, preferably, the side of the protrusion away from the cutter head abuts against the groove wall of the receiving groove arranged circumferentially along the cutter handle.

[0016] Based on the above technical solutions, preferably, the tool holder is provided with a boss, the boss is provided in the receiving groove and protrudes from the groove wall corresponding to the peripheral wall of the tool holder, and the boss is provided in correspondence with the positioning element.

[0017] Based on the above technical solutions, preferably, the tool holder is provided with a positioning groove, the positioning groove is located in the receiving groove, the positioning groove and the boss are distributed along the circumference of the tool holder, and the positioning groove and the boss are correspondingly set.

[0018] The protrusion is located in the positioning groove to position the circumferential connection between the cutter head and the cutter shank.

[0019] Based on the above technical solutions, preferably, the tool holder and the tool head are coaxially arranged, and the end face of the tool holder facing the tool head abuts against the end face of the tool head facing the tool holder.

[0020] Based on the above technical solutions, preferably, the protrusions are configured as multiple protrusions, which are distributed along the circumference of the cutter head;

[0021] Multiple receiving slots are provided, and these multiple receiving slots are distributed along the circumference of the tool holder;

[0022] Multiple positioning elements are provided, and these positioning elements are distributed along the circumference of the tool holder;

[0023] Positioning elements, receiving grooves, and protrusions are set in a one-to-one correspondence.

[0024] Based on the above technical solutions, preferably, there is a gap between two adjacent protrusions along the circumference of the cutter head, so that the two adjacent protrusions together define the mating part;

[0025] The adjacent receiving grooves together define the insertion part, and when the protrusion is provided in the receiving groove, the insertion part is provided in the mating part.

[0026] The drilling tool of this utility model has the following advantages over the prior art:

[0027] (1) A positioning element is set in the gap formed by the protrusion and the receiving groove. The positioning element abuts against the protrusion and the side wall of the receiving groove. Under the action of the positioning element, the cutting head and the tool holder are tightly matched, thereby increasing the connection between the cutting head and the tool holder and preventing the cutting head from circumferentially shaking relative to the tool holder. The positioning element is connected to the tool holder by fasteners such as bolts or screws. The fixing method of the positioning element is simple and easy to operate.

[0028] (2) By designing the positioning component as a four-sided pyramid structure and rounding the edges of the positioning component, the positioning component can better squeeze the cutter head and the cutter handle when it is locked by bolts, thereby improving the locking effect. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the drilling tool of this utility model;

[0031] Figure 2 This is a schematic diagram of the structure of the drilling tool of this utility model without the positioning component;

[0032] Figure 3 This is a schematic diagram of the structure of the knife handle of this utility model;

[0033] Figure 4 This is a schematic diagram of the assembly of the tool holder and the positioning component of this utility model;

[0034] Figure 5 This is a schematic diagram of the cutter head of this utility model;

[0035] Figure 6 This is a schematic diagram of the positioning component of this utility model;

[0036] In the figure: 1. Tool holder; 101. Receiving groove; 102. Positioning groove; 103. First connecting hole; 11. Boss; 12. Insertion part; 2. Tool head; 201. Mating part; 21. Protrusion; 3. Positioning element; 301. Second connecting hole; 4. Gap. Detailed Implementation

[0037] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0038] As attached Figures 1-6 As shown in an illustrative embodiment of the drilling tool of this utility model, the drilling tool includes a cutting head 2, a shank 1, and a positioning member 3; one end of the cutting head 2 contacts the part to be drilled, and the other end of the cutting head 2 is provided with a protrusion 21, which protrudes from the end face of the cutting head 2; a receiving groove 101 is formed on the peripheral wall of the shank 1, which extends along the axial direction of the shank 1 and passes through the shank 1 towards the end of the cutting head 2, and the receiving groove 101 corresponds to the protrusion 21. The protrusion 21 is disposed in the receiving groove 101 so that the cutting head 2 is connected to the cutting handle 1; the protrusion 21 is disposed in the receiving groove 101 and abuts against one side wall of the receiving groove 101 extending axially along the cutting handle 1, and a gap 4 is left between the protrusion 21 and the other side wall of the receiving groove 101 extending axially along the cutting handle 1; the positioning member 3 is disposed in the gap 4, and the positioning member 3 abuts against the protrusion 21 and the other side wall of the receiving groove 101 extending axially along the cutting handle 1 respectively.

[0039] As described above, by providing a protrusion 21 on the cutting head 2 and a receiving groove 101 on the cutting handle 1, the protrusion 21 is placed in the receiving groove 101 to position the connection between the cutting head 2 and the cutting handle 1, thereby achieving rapid preliminary positioning of the cutting head 2 and the cutting handle 1.

[0040] A positioning element 3 is provided within the gap 4 formed by the protrusion 21 and the receiving groove 101. The positioning element 3 abuts against the sidewalls of the protrusion 21 and the receiving groove 101, ensuring a tight fit between the cutting head 2 and the tool holder 1. This increases the connection strength between the cutting head 2 and the tool holder 1, preventing the cutting head 2 from wobbling relative to the tool holder 1. The positioning element 3 is connected to the tool holder 1 by fasteners such as bolts or screws, making the fixing method of the positioning element 3 simple and easy to operate.

[0041] This drilling tool design not only has a simple overall structure and is easy to assemble, but also features easy and simple installation and disassembly of the tool head 2, and a strong connection between the tool head 2 and the tool holder 1.

[0042] like Figure 1 and Figure 2As shown, the side of the protrusion 21 away from the cutter head 2 abuts against the groove wall of the receiving groove 101 arranged circumferentially along the handle 1, so that the handle 1 axially constrains the cutter head 2 and prevents the cutter head 2 from moving relative to the handle 1 axially.

[0043] like Figure 3 As shown, the tool holder 1 is provided with a boss 11. The boss 11 is located in the receiving groove 101 and protrudes from the groove wall corresponding to the peripheral wall of the tool holder 1. The boss 11 is corresponding to the positioning member 3 and is used to radially limit the positioning member 3.

[0044] like Figure 3 As shown, the tool holder 1 has a positioning groove 102, which is located in the receiving groove 101. The positioning groove 102 and the boss 11 are distributed along the circumference of the tool holder 1. The positioning groove 102 and the protrusion 21 are correspondingly arranged. The protrusion 21 is located in the positioning groove 102 to position the circumferential connection between the tool head 2 and the tool holder 1.

[0045] The handle 1 and the cutter head 2 are coaxially arranged. The end face of the handle 1 facing the cutter head 2 and the end face of the cutter head 2 facing the handle 1 abut against each other, so that the handle 1 constrains the cutter head 2 along the axial direction and prevents the handle 1 and the cutter head 2 from moving relative to each other along the axial direction.

[0046] like Figure 3 and Figure 4 As shown, the tool holder 1 has a first connecting hole 103, which is arranged radially along the tool holder 1 and is located in the receiving groove 101; the positioning member 3 has a second connecting hole 301, which is arranged correspondingly to the first connecting hole 103. The first connecting hole 103 and the second connecting hole 301 are connected to the same fastener so that the positioning member 3 is fixedly connected to the tool holder 1.

[0047] Specifically, fasteners are components such as bolts or screws.

[0048] like Figure 5 As shown, there is a distance between two adjacent protrusions 21 along the circumference of the cutter head 2, so that the two adjacent protrusions 21 together define the mating part 201; as Figure 3 As shown, adjacent receiving grooves 101 together define an insertion portion 12. When the protrusion 21 is provided in the receiving groove 101, the insertion portion 12 is provided in the mating portion 201. By making the insertion portion 12 and the mating portion 201 cooperate with each other, the positioning effect of the tool holder 1 and the tool head 2 is further enhanced.

[0049] like Figure 6As shown, the positioning element 3 has a four-sided pyramidal structure, allowing it to move radially along the handle 1. The contact effect between the positioning element 3 and the protrusion 21 and the sidewall of the receiving groove 101 varies depending on how it moves radially. The closer the positioning element 3 is to the axis of the handle 1, the better its contact effect with the protrusion 21 and the sidewall of the receiving groove 101, resulting in a stronger connection between the cutting head 2 and the handle 1. When the positioning element 3 is tightened by bolts, it can better compress the cutting head 2 and the handle 1, improving the tightening effect.

[0050] Specifically, in some embodiments, the two side walls of the receiving groove 101 extending along the axial direction of the tool holder 1 are designed with different shapes. The protrusion 21 is adapted to the shape of the corresponding side wall of the receiving groove 101, and the positioning member 3 is adapted to the shape of the corresponding side wall of the receiving groove 101. On the one hand, the two side walls can be distinguished so that the protrusion 21 can abut against the corresponding side wall of the receiving groove 101. On the other hand, the abutment effect between the protrusion 21 and the corresponding side wall of the receiving groove 101 can be increased.

[0051] like Figure 1 As shown, the two side walls of the positioning member 3 extending axially along the handle 1 abut against the side walls of the protrusion 21 and the receiving groove 101, respectively. The two side walls of the positioning member 3 arranged circumferentially along the handle 1 abut against the side walls of the receiving groove 101 arranged circumferentially along the handle 1 and the end face of the cutting head 2 facing the handle 1, so that the positioning member 3 applies force to the cutting head 2 and the handle 1, thereby axially positioning the cutting head 2 and the handle 1.

[0052] Multiple protrusions 21 are provided, and the multiple protrusions 21 are distributed along the circumference of the cutter head 2; multiple receiving grooves 101 are provided, and the multiple receiving grooves 101 are distributed along the circumference of the cutter shank 1; multiple positioning members 3 are provided, and the multiple positioning members 3 are distributed along the circumference of the cutter shank 1; the positioning members 3, the receiving grooves 101 and the protrusions 21 are provided in a one-to-one correspondence.

[0053] Specifically, the corners of the protrusion 21, the groove wall of the receiving groove 101, the boss 11, and the positioning part 3 are all rounded. This can prevent assembly workers from being cut and reduce wear at the connection.

[0054] Specific implementation steps:

[0055] The protrusion 21 is placed in the corresponding receiving groove 101, so that the groove wall of the receiving groove 101 extending circumferentially along the tool holder 1 abuts against the end of the protrusion 21 away from the tool head 2, and the protrusion 21 abuts against one side of the groove wall of the receiving groove 101 extending axially along the tool holder 1, so that the protrusion 21 and the receiving groove 101 together define a gap 4. Then, the positioning member 3 is placed in the gap 4, so that the second connecting hole 301 and the first connecting hole 103 are aligned with each other. Fasteners such as bolts or screws are sequentially placed in the second connecting hole 301 and the first connecting hole 103, so that the positioning member 3 is fixedly connected to the tool holder 1.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A drill bit, characterized by: It includes a cutter head (2), a cutter holder (1), and a positioning component (3); among which, The cutting head (2) is provided with a protrusion (21), which protrudes from the end face of the cutting head (2); The circumferential wall of the handle (1) is provided with a receiving groove (101), which is provided along the axial direction of the handle (1) and extends through one end of the handle (1) toward the blade (2). The receiving groove (101) is correspondingly provided with the protrusion (21). The protrusion (21) is located in the receiving groove (101) and abuts against one side wall of the receiving groove (101) extending axially along the handle (1). A gap (4) is left between the protrusion (21) and the other side wall of the receiving groove (101) extending axially along the handle (1). The positioning element (3) is located in the gap (4), and the positioning element (3) abuts against the protrusion (21) and the receiving groove (101) on the other side wall extending along the axial direction of the handle (1).

2. The hole cutting tool as described in claim 1, characterized in that: The handle (1) is provided with a first connecting hole (103), which extends radially along the handle (1); The positioning member (3) has a second connecting hole (301), which is corresponding to the first connecting hole (103). The first connecting hole (103) and the second connecting hole (301) are connected to the same fastener so that the positioning member (3) is fixedly connected to the tool holder (1).

3. The drilling tool as described in claim 1, characterized in that: The positioning element (3) has a four-sided pyramidal structure with rounded and chamfered edges.

4. The drilling tool as described in claim 1, characterized in that: The two side walls of the positioning member (3) arranged around the handle (1) respectively abut against the side wall of the receiving groove (101) arranged around the handle (1) and the end face of the cutter head (2) facing the handle (1).

5. The drilling tool as described in claim 1, characterized in that: The side of the protrusion (21) away from the blade (2) abuts against the groove wall of the receiving groove (101) arranged circumferentially along the handle (1).

6. The drilling tool as described in claim 1, characterized in that: The tool holder (1) is provided with a boss (11), which is located in the receiving groove (101) and protrudes from the receiving groove (101) and is provided with the groove wall corresponding to the peripheral wall of the tool holder (1). The boss (11) is provided with the positioning member (3).

7. The drilling tool as described in claim 6, characterized in that: The tool holder (1) is provided with a positioning groove (102), which is located in the receiving groove (101). The positioning groove (102) and the boss (11) are distributed along the circumference of the tool holder (1), and the positioning groove (102) is correspondingly provided with the protrusion (21). The protrusion (21) is provided in the positioning groove (102) to position the circumferential connection between the cutter head (2) and the cutter handle (1).

8. The drilling tool as described in claim 1, characterized in that: The handle (1) and the blade (2) are coaxially arranged, and the end face of the handle (1) facing the blade (2) abuts against the end face of the blade (2) facing the handle (1).

9. The drilling tool as described in claim 1, characterized in that: The protrusions (21) are provided in multiple ways, and the multiple protrusions (21) are distributed along the circumference of the cutter head (2); The receiving groove (101) is provided in multiple ways, and the multiple receiving grooves (101) are distributed along the circumference of the tool holder (1); Multiple positioning elements (3) are provided, and the multiple positioning elements (3) are distributed along the circumference of the tool holder (1); The positioning element (3), the receiving groove (101), and the protrusion (21) are provided in a one-to-one correspondence.

10. The drilling tool as described in claim 9, characterized in that: There is a gap between two adjacent protrusions (21) along the circumference of the cutter head (2) so that the two adjacent protrusions (21) together define a mating part (201). The adjacent receiving grooves (101) together define an insertion part (12), and when the protrusion (21) is provided in the receiving groove (101), the insertion part (12) is provided in the mating part (201).

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