Modular metal drill with easy assembly and disassembly

Abstract

The utility model discloses a module type metal drilling tool convenient to assemble and disassemble, including tool bit, tool bar and screw or screw plug, one end of tool bar is equipped with the installation groove and with this end as upper end, and the lower end of tool bit is placed in the installation groove, is equipped with the blocking portion on tool bit, and the upper end of tool bar is equipped with tool bar screw hole, and screw or screw plug is connected with tool bar screw hole and contacts with blocking portion to block tool bit and moves upward. The utility model discloses the screw (or screw plug) connecting structure between tool bit and tool bar is improved from the traditional built-in mode to the external mode, and through the blocking portion on tool bit and tool bar screw hole on tool bar and screw, the screw connection function between tool bit and tool bar can be realized by assembling and disassembling the screw from the top of tool bit, the operation is very convenient, and the tool bar does not need to be taken out from the handle clamping hole, and the assembling and disassembling efficiency is improved.

Description

Technical Field

[0001] This utility model relates to a metal drilling tool, and more particularly to a modular metal drilling tool that is easy to assemble and disassemble. Background Technology

[0002] The basic structure of modular metal drilling tools includes interconnected tool holders and tool heads. Depending on the connection method of the tool holder and tool head, they can generally be divided into self-locking structures without fasteners such as screws, screw-locking connections, and dual connection structures that have both self-locking and screw-locking connections. Each structure has its own advantages and disadvantages.

[0003] In traditional screw-connected structures, the screws are often internal, meaning the stud passes through the through hole in the shank and connects to the screw hole on the cutter head. While this structure offers a stable and reliable connection, it suffers from several drawbacks: The long shank requires a long wrench to be inserted into it for screw installation and removal, making the process time-consuming and laborious. Furthermore, the difficulty in visual inspection further complicates the operation. If the wrench cannot be inserted into the end of the shank, the shank must be removed from the clamping hole in the shank, further complicating the process and reducing efficiency. Additionally, existing self-locking connection structures often have a limited range of self-locking surfaces, leading to insufficient connection reliability. Utility Model Content

[0004] The purpose of this invention is to provide a modular metal drilling tool with external screws that is easy to install and remove in order to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions: A modular metal drilling tool that is easy to assemble and disassemble includes a cutting head and a cutting shank. One end of the cutting shank is provided with a mounting groove, and the lower end of the cutting head is placed in the mounting groove. The modular metal drilling tool also includes a screw or a plug. The cutting head is provided with a blocking part, and the upper end of the cutting shank is provided with a cutting shank screw hole. The screw or plug is connected to the cutting shank screw hole and contacts the blocking part to prevent the cutting head from moving upward.

[0006] Preferably, to achieve a more reliable screw connection and facilitate assembly and disassembly, the cutter head has a first vertical plane on each side, and the mounting groove of the cutter bar has a first vertical plane on each side. The two first vertical planes of the cutter head are in close contact with the two first vertical planes of the cutter bar and are interference-fitted. The upper part of the first vertical plane of the cutter head is concave to form a cutter head groove that is open at the top and laterally arc-shaped. The bottom of the cutter head groove forms the blocking part. The upper ends of the mounting grooves of the cutter bar have a cutter bar groove that is open at the top. The two cutter bar grooves are laterally connected to the cutter head grooves, and the bottom of the cutter bar grooves is located below the bottom of the cutter head groove. The vertical screw holes of the cutter bar are located at the bottom of the cutter bar grooves. The lower ends of the studs of the two vertical screws are connected to the two screw holes of the cutter bar, and a portion of the nuts of the two screws are placed in the two cutter head grooves.

[0007] Preferably, to achieve better positioning and connection, the cutter head has a second vertical plane on each side. The first and second vertical planes on the same side have an angle greater than 90° and less than 180° between them. The first and second vertical planes on the same side together form a first "V" shaped surface of the cutter head. The two first "V" shaped surfaces rotate around the center line of the cutter head to form an asymmetrical structure. The mounting groove of the cutter bar has a second vertical plane on each side. The first and second vertical planes on the same side have an angle greater than 90° and less than 180° between them. The two vertical planes of the tool holder have an angle greater than 90° and less than 180°. The first vertical plane and the second vertical plane of the tool holder, located on the same side, together form the first "V" shaped surface of the tool holder. The two first "V" shaped surfaces of the tool holder rotate around the center line of the tool holder to form an asymmetrical structure. The two second vertical planes of the cutter head are in close contact with the two second vertical planes of the tool holder and are interference-fitted. At the same time, because the two first vertical planes 11 of the cutter head are also in close contact with the two first vertical planes 21 of the tool holder and are interference-fitted, a transverse over-positioning connection function parallel to the first vertical plane of the cutter head is realized.

[0008] Preferably, to achieve better positioning and connection, the lower end of the cutter head is provided with a second "V" shaped surface of the cutter head, which is formed by the intersection of the first inclined plane and the second inclined plane of the cutter head and is concave upward. The included angle between the first inclined plane and the second inclined plane of the cutter head is greater than 90° and not greater than 180°. The bottom of the mounting groove of the cutter bar is provided with a second "V" shaped surface of the cutter bar, which is formed by the intersection of the first inclined plane and the second inclined plane of the cutter bar and is convex upward. The included angle between the first inclined plane and the second inclined plane of the cutter bar is greater than 90° and not greater than 180°. The second "V" shaped surface of the cutter head and the second "V" shaped surface of the cutter bar are in close contact and are interference-fitted.

[0009] Preferably, to accommodate the lateral assembly and disassembly requirements of some applications, the cutter head is provided with a first vertical plane on both sides, and the mounting groove of the cutter bar is provided with a first vertical plane on both sides. The two first vertical planes of the cutter head are in close contact with the two first vertical planes of the cutter bar. A transverse and tapered positioning blind hole is provided on the first vertical plane of the cutter head. The hole wall of the positioning blind hole forms the blocking part. The mounting groove of the cutter bar is provided with transverse screw holes on both sides. The two screw plugs are installed in the two screw holes of the cutter bar, and the cone at one end of each plug is placed in the two positioning blind holes.

[0010] The beneficial effects of this utility model are as follows: This invention improves the screw (or plug) connection structure between the cutter head and the cutter shank from the traditional built-in method to an external method. By using the blocking part on the cutter head, the screw hole on the cutter shank, and the screw together, the screw connection between the cutter head and the cutter shank can be achieved by simply installing and removing the screw from the top of the cutter head. The operation is very convenient, and there is no need to remove the cutter shank from the clamping hole of the cutter shank, which improves the efficiency of installation and removal. By integrating the surface contact over-positioning connection structure with the screw connection structure, a multi-connection structure is formed, which further improves the connection reliability between the cutter head and the cutter shank. Attached Figure Description

[0011] Figure 1 This is a top-view three-dimensional structural diagram of the modular metal drilling tool described in Embodiment 1 of this utility model before assembly; Figure 2 This is a schematic diagram of the main structure of the modular metal drilling tool described in Embodiment 1 of this utility model before assembly; Figure 3 This is a bottom-view three-dimensional structural diagram of the modular metal drilling tool described in Embodiment 1 of this utility model before assembly; Figure 4 This is a top-view three-dimensional structural diagram of the modular metal drilling tool that is easy to assemble and disassemble, as described in Embodiment 1 of this utility model. Figure 5 This is a top-view three-dimensional structural diagram of the modular metal drilling tool described in Embodiment 2 of this utility model before assembly; Figure 6 This is a top-view three-dimensional structural diagram of the modular metal drilling tool described in Embodiment 3 of this utility model before assembly; Figure 7 This is a top-view three-dimensional structural diagram of the modular metal drilling tool described in Embodiment 4 of this utility model before assembly; Figure 8This is a top-view three-dimensional structural diagram of the modular metal drilling tool described in Embodiment 5 of this utility model before assembly. Detailed Implementation

[0012] The present invention will be further described below with reference to the embodiments and accompanying drawings: Example

[0013] like Figures 1-4 As shown, a modular metal drilling tool that is easy to assemble and disassemble includes a tool head 1, a tool shank 2, and a screw 3. One end of the tool shank 2 is provided with a mounting groove (not marked in the figure) and the upper end is the same end. The lower end of the tool head 1 is placed in the mounting groove. The tool head 1 is provided with a blocking part (the structure of which is described below). The upper end of the tool shank 2 is provided with a tool shank screw hole 29. The screw 3 is connected to the tool shank screw hole 29 and contacts the blocking part to prevent the tool head 1 from moving upward.

[0014] This embodiment also discloses the following more optimized specific structures: To achieve a more reliable screw connection and facilitate assembly and disassembly, the cutter head 1 has a first vertical plane 11 on each side, and the mounting groove of the cutter shank 2 has a first vertical plane 21 on each side of the groove. The two first vertical planes 11 of the cutter head are in close contact with the two first vertical planes 21 of the cutter shank and are interference-fitted. The upper part of the first vertical plane 11 of the cutter head is concave to form a cutter head groove 18 that is through at the upper end and laterally arc-shaped. The bottom of the cutter head groove 18 forms a... The blocking part has a tool holder groove 28 with a through upper end on the upper end of the groove wall on both sides of the mounting groove of the tool holder 2. The two tool holder grooves 28 are respectively transversely connected to the tool head groove 18 and the bottom of the tool holder groove 28 is located below the bottom of the tool head groove 18. The vertical tool holder screw hole 29 is provided at the bottom of the tool holder groove 28. The lower ends of the studs of the two vertical screws 3 are respectively connected to the two tool holder screw holes 29. Part of the nuts of the two screws 3 are respectively placed in the two tool head grooves 18.

[0015] To achieve better positioning and connection, the cutter head 1 has a second vertical plane 12 on each side. The first vertical plane 11 and the second vertical plane 12 on the same side have an angle greater than 90° and less than 180°, approximately 160° in the figure. The first vertical plane 11 and the second vertical plane 12 on the same side together form a first "V" shaped surface of the cutter head. The two first "V" shaped surfaces of the cutter head rotate around the center line of the cutter head 1 to form an asymmetrical structure. The mounting groove of the cutter bar 2 has a second vertical plane 22 on each side of the groove wall. The first vertical plane 21 and the second vertical plane 22 on the same side have a second vertical plane 22 on each side of the groove wall. The two vertical planes 22 have an angle greater than 90° and less than 180°, approximately 160° in the figure. The first vertical plane 21 and the second vertical plane 22 of the tool holder, located on the same side, together form the first "V" shaped surface of the tool holder. The two first "V" shaped surfaces of the tool holder rotate around the center line of the tool holder 2 to form an asymmetrical structure. The two second vertical planes 12 of the tool head are in close contact with the two second vertical planes 22 of the tool holder and are interference-fitted. At the same time, because the two first vertical planes 11 of the tool head are also in close contact with the two first vertical planes 21 of the tool holder and are interference-fitted, a transverse over-positioning connection function parallel to the first vertical plane 11 of the tool head is realized.

[0016] To achieve better positioning and connection, the lower end of the cutter head 1 is provided with a second "V" shaped surface of the cutter head, which is formed by the intersection of the first inclined plane 13 and the second inclined plane 14 of the cutter head and is concave upward. The included angle between the first inclined plane 13 and the second inclined plane 14 of the cutter head is greater than 90° and not greater than 180°, and is about 100° in the figure. The bottom of the mounting groove of the cutter bar 2 is provided with a second "V" shaped surface of the cutter bar, which is formed by the intersection of the first inclined plane 23 and the second inclined plane 24 of the cutter bar and is convex upward. The included angle between the first inclined plane 23 and the second inclined plane 24 of the cutter bar is greater than 90° and not greater than 180°, and is about 100° in the figure. The second "V" shaped surface of the cutter head and the second "V" shaped surface of the cutter bar are in close contact and are interference-fitted.

[0017] Figure 1 , Figure 2 and Figure 4 The back face 19 provided on the cutter head 1 is also shown. Figures 1-3 The back of the cutting edge 17, which is provided on the cutting head 1, is also shown. Figures 1-4 Also shown are the cutting edge 16 and chip removal spiral groove 15 on the cutting head 1, and the cutting edge 26, cutting edge back 27 and chip removal spiral groove 25 on the cutting shank 2. These structures are all conventional and adaptable structures.

[0018] like Figures 1-4As shown, during assembly, first place the lower end of the cutter head 1 into the mounting groove at the upper end of the cutter shank 2, and slowly move it downwards. With the cooperation of multiple "V" shaped surfaces, the cutter head 1 adaptively rotates at a small angle until the multiple sets of "V" shaped surfaces of the cutter head 1 and the cutter shank 2 cooperate with each other and form an interference fit. At this time, the self-locking connection process between the cutter head 1 and the cutter shank 2 is completed. Then, place two screws 3 from top to bottom into the two screw holes 29 of the cutter shank and tighten them until the nuts of the screws 3 press against the bottom of the groove 18 of the cutter head, completing the screw connection process between the cutter head 1 and the cutter shank 2. During assembly, first place the lower end of the cutter head 1 into the mounting groove at the upper end of the cutter shank 2, and slowly move it downwards. With the tight fit between the first "V" shaped surface of the cutter head and the first "V" shaped surface of the cutter shank, a transverse over-positioning connection parallel to the first vertical plane 11 of the cutter head is achieved between the cutter head 1 and the cutter shank 2. Then, place two screws 3 from top to bottom into the two screw holes 29 of the cutter shank and tighten them until the nuts of the screws 3 press against the bottom of the groove 18 of the cutter head, so that the second "V" shaped surface of the cutter head is in close contact with the second "V" shaped surface of the cutter shank. At the same time, the two first vertical surfaces 11 of the cutter head are also in close contact with the two first vertical surfaces 12 of the cutter shank, achieving a transverse over-positioning connection perpendicular to the first vertical plane 11 of the cutter head. This completes the screw connection and stable over-positioning process between the cutter head 1 and the cutter shank 2. Example

[0019] like Figure 5 As shown, based on Embodiment 1, the following related structures are retained: The cutter head 1 has a first vertical plane 11 on each side; the mounting groove of the cutter shank 2 has a first vertical plane 21 on each side of the groove; the two first vertical planes 11 of the cutter head are in close contact with the two first vertical planes 21 of the cutter shank. The following related structures are changed: the cutter head groove 18 on the cutter head 1 and the cutter shank groove 28 on the cutter shank 2 are removed and replaced with a transverse and tapered positioning blind hole 10 on the first vertical plane 11 of the cutter head. The hole wall of the positioning blind hole 10 forms the blocking part in Embodiment 1. A transverse screw hole 20 is provided on each side of the mounting groove of the cutter shank 2 to replace the cutter shank screw hole 29 in Embodiment 1. Two screw plugs 4 are respectively installed in the two transverse screw holes 20, and the cone at one end of each plug is placed in the two positioning blind holes 10. To maintain a vertical force on the cutter head 1, the center line of the screw plug 4 is slightly lower than the center line of the positioning blind hole 10. Other structures are the same as in Embodiment 1.

[0020] In this embodiment, the difference lies in the change of the screw connection structure between the cutter head 1 and the cutter shank 2. A transverse screw plug 4, a transverse positioning blind hole 10, and a transverse screw hole 20 are used in combination to achieve a transverse threaded connection structure, replacing the vertical screw connection structure of Embodiment 1. The assembly process of this embodiment is similar to that of Embodiment 1. Example

[0021] like Figure 6As shown, this embodiment uses a cylindrical cutter head 5 with a connecting cylinder 52 at the lower end and a cylindrical slotted cutter bar 6 with a cylindrical mounting groove 62 at the upper end. The connecting cylinder 52 is placed in the cylindrical mounting groove 62 to achieve a concentric connection. Positioning slots 51 are provided on both sides of the cylindrical cutter head 5, and screw hole slots 61 are provided on both sides of the upper part of the cylindrical slotted cutter bar 6. Screw holes 63 are provided at the bottom of the screw hole slots 61. The studs of two screws 3 are connected to the two screw holes 63 respectively, and the nuts of the two screws 3 press against the bottom of the two positioning slots 51 respectively. Compared with Embodiment 1, this embodiment mainly changes the concentric connection structure. Example

[0022] like Figure 7 As shown, in this embodiment, the vertical screw connection structure in embodiment 3 is changed to a horizontal screw plug connection structure. That is, positioning grooves 53 are provided on both sides of the connecting cylinder 52, and horizontal connecting screw holes 64 are provided on both sides of the groove wall of the cylindrical grooved cutter bar 6. Two screw plugs 4 are respectively installed in the two connecting screw holes 64, and the conical end of one end of each screw plug is placed in the two positioning grooves 53. The center line of the screw plug 4 is slightly lower than the center line of the positioning groove 53. Under the extrusion force of the screw plug 4, the lower conical surface of the screw plug 4 applies pressure to the lower inclined surface of the positioning groove 53, so that the cutter head 5 and the cutter bar 6 are in close vertical contact. Example

[0023] like Figure 8 As shown, in this embodiment, the vertical screw connection structure in embodiment 3 is changed to an oblique screw plug connection structure, that is: a positioning ring groove 54 is provided on the connecting cylinder 52, and oblique screw holes 65 are respectively provided on the two sides of the groove wall of the cylindrical grooved tool 6. Two columnar screw plugs 7 are respectively installed in the two oblique screw holes 65 and one end of them is placed in the positioning ring groove 54.

[0024] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A modular metal drilling tool that is easy to assemble and disassemble, comprising a tool head and a tool shank, wherein one end of the tool shank is provided with a mounting groove and the upper end is located at that end, and the lower end of the tool head is placed in the mounting groove, characterized in that: The modular metal drilling tool that is easy to assemble and disassemble also includes a screw or plug. The cutting head is provided with a blocking part, and the upper end of the cutting shank is provided with a cutting shank screw hole. The screw or plug is connected to the cutting shank screw hole and contacts the blocking part to prevent the cutting head from moving upward.

2. The modular metal drilling tool that is easy to assemble and disassemble according to claim 1, characterized in that: The cutter head has a first vertical plane on each side, and the mounting groove of the cutter bar has a first vertical plane on each side. The two first vertical planes of the cutter head are in close contact with the two first vertical planes of the cutter bar and are interference-fitted. The upper part of the first vertical plane of the cutter head is concave to form a cutter head groove that is open at the top and laterally arc-shaped. The bottom of the cutter head groove forms the blocking part. The upper ends of the mounting grooves of the cutter bar have a cutter bar groove that is open at the top. The two cutter bar grooves are laterally connected to the cutter head grooves, and the bottom of the cutter bar grooves is located below the bottom of the cutter head groove. The vertical screw hole of the cutter bar is located at the bottom of the cutter bar groove. The lower ends of the studs of the two vertical screws are connected to the two screw holes of the cutter bar, and a portion of the nuts of the two screws is placed in the two cutter head grooves.

3. The modular metal drilling tool that is easy to assemble and disassemble according to claim 2, characterized in that: The cutter head has two second vertical planes on its two sides. The first and second vertical planes on the same side have an angle greater than 90° and less than 180°. The first and second vertical planes on the same side together form a first "V" shaped surface of the cutter head. The two first "V" shaped surfaces rotate around the center line of the cutter head to form an asymmetrical structure. The mounting groove of the cutter bar has two second vertical planes on its two sides. The first and second vertical planes on the same side have an angle greater than 90° and less than 180°. The first and second vertical planes on the same side together form a first "V" shaped surface of the cutter bar. The two first "V" shaped surfaces rotate around the center line of the cutter bar to form an asymmetrical structure. The two second vertical planes of the cutter head are in close contact with the two second vertical planes of the cutter bar and are interference-fitted.

4. The modular metal drilling tool that is easy to assemble and disassemble according to any one of claims 1-3, characterized in that: The lower end of the cutter head is provided with a second "V" shaped surface of the cutter head, which is formed by the intersection of the first inclined plane of the cutter head and the second inclined plane of the cutter head and is concave upward. The included angle between the first inclined plane of the cutter head and the second inclined plane of the cutter head is greater than 90° and not greater than 180°. The bottom of the mounting groove of the cutter bar is provided with a second "V" shaped surface of the cutter bar, which is formed by the intersection of the first inclined plane of the cutter bar and the second inclined plane of the cutter bar and is convex upward. The included angle between the first inclined plane of the cutter bar and the second inclined plane of the cutter bar is greater than 90° and not greater than 180°. The second "V" shaped surface of the cutter head and the second "V" shaped surface of the cutter bar are in close contact and are interference-fitted.

5. The modular metal drilling tool that is easy to assemble and disassemble according to claim 1, characterized in that: The cutter head has a first vertical plane on each side, and the mounting groove of the cutter bar has a first vertical plane on each side. The two first vertical planes of the cutter head are in close contact with the two first vertical planes of the cutter bar. The first vertical plane of the cutter head has a transverse and conical positioning blind hole. The wall of the positioning blind hole forms the blocking part. The mounting groove of the cutter bar has a transverse screw hole on each side. The two screw plugs are installed in the two screw holes of the cutter bar, and the cone at one end of each plug is placed in the two positioning blind holes.

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