Inner hole fine boring cutter

Abstract

The utility model discloses an inner hole fine boring cutter, which belongs to the technical field of machine part processing and comprises a boring cutter rod and a cutter handle, a boring cutter blade is mounted on the boring cutter rod, a connecting block is fixedly connected to the top end of the boring cutter rod, a connecting cylinder matched with the connecting block is fixedly connected to the bottom end of the cutter handle, and a fixing component is arranged on the connecting cylinder. According to the scheme, a user can complete assembly, disassembly and replacement of the boring cutter rod by rotating the limiting ring and sliding the fixing block, the process is simple and convenient, tedious steps are avoided, external tools are not needed, the positioning blocks at the outer ends of the limiting columns can tightly abut against the inner wall of the connecting hole, and therefore the boring cutter rod can be conveniently assembled and disassembled. Therefore, a gap possibly existing between the limiting column and the inner wall of the connecting hole is eliminated, the stability of the limiting column located in the inner cavity of the connecting hole is effectively improved, the situation that in the long-term use process, the fixing stability of the boring cutter rod is lowered due to abrasion of the surface of the limiting column and the inner wall of the connecting hole is avoided, and then the cutting precision of the boring cutter blade is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of machine part processing, and more specifically, to an internal hole fine boring tool. Background Technique

[0002] A fine boring tool is a tool used to ensure the accuracy of the hole diameter, position degree, roughness, roundness, etc. When fine boring an internal hole, generally, one fine boring tool holder is configured with one fine boring tool bar, and the boring inserts for cutting are installed on the fine boring tool bar. However, due to actual processing requirements, different boring inserts are needed, and the existing fine boring tool holders are not convenient for the fine boring tool bar.

[0003] Chinese Patent Authorization Publication No.: CN215431570 provides a replaceable internal hole fine boring tool body device. This solution realizes the replacement of the boring tool by only rotating the turntable through adding a fixing mechanism, a co-directional transmission gear, a reverse transmission gear, a first direction-changing gear, a second direction-changing gear, and a turntable, which is more rapid and convenient in use, thus improving the processing efficiency.

[0004] However, this solution fixes the boring tool bar by docking the fixing block with the hole position on the boring tool bar, and at the same time facilitates the installation, disassembly, and replacement of the boring tool bar. However, during long-term use, the fixing block and the hole position rub against each other repeatedly, which easily causes wear on the surface of the fixing block and the inner wall of the hole position, resulting in a gap between the fixing block and the hole position during docking, thereby reducing the stability of the boring tool bar fixation and possibly causing a decline in the cutting accuracy of the boring insert. Therefore, an internal hole fine boring tool is proposed for the above problems. Content of the Utility Model

[0005] 1. Technical Problems to be Solved

[0006] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide an internal hole fine boring tool. In this solution, the user can complete the installation, disassembly, and replacement of the boring tool bar by rotating the limit ring and sliding the fixing block. The process is simple and convenient, without cumbersome steps, and no external tools are needed. The multiple positioning blocks at the outer end of the limit post can be in close contact with the inner wall of the connection hole, thereby eliminating the possible gap between the limit post and the inner wall of the connection hole, effectively improving the stability of the limit post when it is located in the inner cavity of the connection hole, avoiding the decline in the fixing stability of the boring tool bar caused by the wear of the surface of the limit post and the inner wall of the connection hole during long-term use, and further ensuring the cutting accuracy of the boring insert.

[0007] 2. Technical Solution

[0008] To solve the above problems, the utility model adopts the following technical solutions.

[0009] Internal hole fine boring tool, including a boring tool rod and a tool holder. A boring blade is installed on the boring tool rod, and a connecting block is fixedly connected to the top end of the boring tool rod. A connecting cylinder matching the connecting block is fixedly connected to the bottom end of the tool holder. A fixing component is arranged on the connecting cylinder. The fixing component includes a pair of symmetrically arranged limiting columns. A pair of connecting holes matching the limiting columns are opened on the connecting block. Multiple positioning blocks are arranged at the outer end of the limiting column, and the multiple positioning blocks are arranged in a cross shape.

[0010] Furthermore, a pair of symmetrically arranged limiting holes are opened on the connecting cylinder. The limiting column is arranged in the inner cavity of the limiting hole, and a first spring is sleeved on the outer end of the limiting column. The first spring is located outside the connecting cylinder, and both ends of the first spring are fixedly connected to the limiting column and the connecting cylinder respectively.

[0011] Furthermore, the fixing component further includes a limiting ring. The limiting ring is rotatably connected to the connecting cylinder, and a pair of arc-shaped grooves are opened at the inner end of the limiting ring. The pair of arc-shaped grooves are centrosymmetric.

[0012] Furthermore, the end of the limiting column located outside the connecting cylinder is arranged inside the arc-shaped groove, and one end of the limiting column abuts against the inner wall of the arc-shaped groove.

[0013] Furthermore, multiple positioning grooves matching the positioning blocks are opened at the outer end of the limiting column. The positioning blocks are slidably connected to the inner wall of the positioning groove, and the shape of the end of the positioning block close to the inner side of the connecting cylinder is arc-shaped. A second spring is arranged in the positioning groove, and both ends of the second spring are fixedly connected to the positioning block and the inner wall of the positioning groove respectively.

[0014] Furthermore, the fixing component further includes a fixing block. The fixing block is slidably connected to the connecting cylinder, and a fixing hole matching the fixing block is opened on the limiting ring.

[0015] 3. Beneficial effects

[0016] Compared with the prior art, the advantages of the present utility model are as follows:

[0017] In this solution, the user can complete the installation, disassembly and replacement of the boring tool rod by rotating the limiting ring and sliding the fixing block. The process is simple and convenient, without cumbersome steps, and no external tools are required. The multiple positioning blocks at the outer end of the limiting column can be closely abutted against the inner wall of the connecting hole, thereby eliminating the possible gaps between the limiting column and the inner wall of the connecting hole, effectively improving the stability of the limiting column in the inner cavity of the connecting hole, and avoiding the decline of the fixing stability of the boring tool rod caused by the wear of the surface of the limiting column and the inner wall of the connecting hole during long-term use, and further ensuring the cutting accuracy of the boring blade. Brief description of the drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0019] Figure 2 This is a schematic structural diagram of the boring blade of the present utility model;

[0020] Figure 3 This is a schematic structural diagram of the explosion of the present utility model;

[0021] Figure 4 This is a schematic cross-sectional structural diagram of the connecting cylinder of the present utility model;

[0022] Figure 5 This is a schematic cross-sectional structural diagram of the limit post of the present utility model.

[0023] Explanation of the reference numerals in the figure:

[0024] 1. Boring tool bar;

[0025] 2. Boring blade;

[0026] 3. Connecting block;

[0027] 4. Connecting hole;

[0028] 5. Tool handle;

[0029] 6. Connecting cylinder;

[0030] 7. Fixing assembly; 701. Limit ring; 702. Arc groove; 703. Limit post; 704. First spring; 705. Positioning groove; 706. Positioning block; 707. Second spring; 708. Fixing hole; 709. Fixing block;

[0031] 8. Limit hole. Specific embodiments

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Embodiment:

[0036] Please refer to Figures 1-4 , the internal hole fine boring tool includes a boring tool bar 1 and a tool holder 5. A boring blade 2 is installed on the boring tool bar 1, and a connecting block 3 is fixedly connected to the top end of the boring tool bar 1. A connecting cylinder 6 matching the connecting block 3 is fixedly connected to the bottom end of the tool holder 5. A fixing component 7 is provided on the connecting cylinder 6. The fixing component 7 includes a pair of symmetrically arranged limiting columns 703. A pair of connecting holes 4 matching the limiting columns 703 are opened on the connecting block 3. A plurality of positioning blocks 706 are arranged at the outer end of the limiting column 703, and the plurality of positioning blocks 706 are arranged in a cross shape.

[0037] The fine boring tool is a tool whose function is to ensure the aperture accuracy, ensure the position degree, roughness, roundness, etc. When fine boring the internal hole, generally, a fine boring tool holder is configured with a fine boring tool bar, and the boring blade for cutting is installed on the fine boring tool bar. However, due to actual processing needs, different boring blades are to be used. In this solution, the cutting edge of the boring blade 2 is set to an obtuse angle, which helps to reduce slag adhesion during cutting. When the user needs to install the boring tool bar 1 on the tool holder 5, the connecting hole 4 needs to be inserted into the inside of the connecting cylinder 6 from the bottom end of the connecting cylinder 6. When the top end of the tool holder 5 abuts against the top end of the inner cavity of the connecting cylinder 6, a pair of limiting columns 703 will be aligned with the connecting hole 4. The user controls a pair of limiting columns 703 to enter the inside of the connecting hole 4 by rotating the limiting ring 701, thereby realizing the fixation of the boring tool bar 1. A plurality of positioning blocks 706 at the outer end of the limiting column 703 are tightly abutted against the inner wall of the connecting hole 4 under the elastic force of the second spring 707, thereby eliminating the possible gap between the limiting column 703 and the inner wall of the connecting hole 4, and effectively improving the stability of the limiting column 703 when it is located in the inner cavity of the connecting hole 4.

[0038] Please refer to Figures 4-5, a pair of symmetrically arranged limiting holes 8 are formed in the connecting cylinder 6. The limiting post 703 is arranged in the inner cavity of the limiting hole 8, and a first spring 704 is sleeved on the outer end of the limiting post 703. The first spring 704 is located outside the connecting cylinder 6, and both ends of the first spring 704 are fixedly connected to the limiting post 703 and the connecting cylinder 6 respectively. The fixing assembly 7 further includes a limiting ring 701. The limiting ring 701 is rotatably connected to the connecting cylinder 6, and a pair of arc-shaped grooves 702 are formed in the inner end of the limiting ring 701. The pair of arc-shaped grooves 702 are centrosymmetric. The end of the limiting post 703 located outside the connecting cylinder 6 is arranged inside the arc-shaped groove 702, and one end of the limiting post 703 abuts against the inner wall of the arc-shaped groove 702. A plurality of positioning grooves 705 matching the positioning blocks 706 are formed in the outer end of the limiting post 703. The positioning blocks 706 are slidably connected to the inner walls of the positioning grooves 705, and the shape of the end of the positioning block 706 close to the inner side of the connecting cylinder 6 is arc-shaped. A second spring 707 is arranged in the positioning groove 705, and both ends of the second spring 707 are fixedly connected to the positioning block 706 and the inner wall of the positioning groove 705 respectively.

[0039] When the user rotates the limiting ring 701, the inner wall of the arc-shaped groove 702 will squeeze the limiting post 703, causing the limiting post 703 to move towards the inner side of the connecting cylinder 6, and at the same time squeezing the first spring 704, thereby causing the limiting post 703 to enter the inner cavity of the connecting hole 4. Since one end of the plurality of positioning blocks 706 is arranged in an arc shape, when the limiting post 703 enters the inner cavity of the connecting hole 4, the positioning blocks 706 will be squeezed by the edge position of the connecting hole 4 and move towards the inside of the positioning groove 705, and squeeze the second spring 707. After the limiting post 703 completely enters the connecting hole 4, the plurality of positioning blocks 706 will be in close contact with the inner wall of the connecting hole 4 under the elastic force of the second spring 707.

[0040] Please refer to Figures 3-4 , the fixing assembly 7 further includes a fixing block 709. The fixing block 709 is slidably connected to the connecting cylinder 6, and a fixing hole 708 matching the fixing block 709 is formed in the limiting ring 701.

[0041] When the limit post 703 completely enters the connection hole 4, the fixing hole 708 on the limit ring 701 will also rotate to the lower side of the fixing block 709. At this time, the user can slide the fixing block 709 and insert the fixing block 709 into the fixing hole 708, so as to limit the limit ring 701 through the fixing block 709, prevent the rotation of the limit ring 701, and then position a pair of limit posts 703. To avoid the displacement of the limit post 703 caused by the shaking of the limit ring 701 during the high-speed rotation of the boring bar 1 and the tool holder 5. Similarly, when the user needs to replace the boring bar 1, take out the fixing block 709 from the fixing hole 708, then rotate the limit ring 701 in the reverse direction, and a pair of limit posts 703 will be reset under the elastic force of the first spring 704 and disengage from the connection hole 4, thus releasing the fixing of the connecting cylinder 6 to the tool holder 5. At this time, the user can remove the boring bar 1 and replace it. The installation and removal process of the boring bar 1 is simple and convenient, without cumbersome steps and without borrowing external tools.

[0042] Working principle:

[0043] When the user needs to install the boring bar 1 on the tool holder 5, first insert the connection hole 4 into the inside of the connecting cylinder 6 from the bottom end of the connecting cylinder 6. When the top end of the tool holder 5 abuts against the top end of the inner cavity of the connecting cylinder 6, a pair of limit posts 703 will be aligned with the connection hole 4. At this time, the user rotates the limit ring 701, and the inner wall of the arc-shaped groove 702 will squeeze the limit post 703, causing the limit post 703 to move towards the inner side of the connecting cylinder 6 and simultaneously squeezing the first spring 704, so that the limit post 703 enters the inner cavity of the connection hole 4. When the limit post 703 enters the inner cavity of the connection hole 4, the positioning block 706 will be squeezed by the edge position of the connection hole 4 and move into the positioning groove 705, and squeeze the second spring 707. When the limit post 703 completely enters the connection hole 4, multiple positioning blocks 706 will tightly abut against the inner wall of the connection hole 4 under the elastic force of the second spring 707, so as to eliminate the possible gap between the limit post 703 and the inner wall of the connection hole 4. When the limit post 703 completely enters the inside of the connection hole 4, the fixing hole 708 on the limit ring 701 will also rotate to the lower side of the fixing block 709. At this time, the user can slide the fixing block 709 and insert the fixing block 709 into the fixing hole 708, so as to limit the limit ring 701 through the fixing block 709 and prevent the rotation of the limit ring 701. When the user needs to replace the boring bar 1, take out the fixing block 709 from the fixing hole 708, then rotate the limit ring 701 in the reverse direction, and a pair of limit posts 703 will be reset under the elastic force of the first spring 704 and disengage from the connection hole 4, thus releasing the fixing of the connecting cylinder 6 to the tool holder 5. At this time, the user can remove the boring bar 1 and replace it.

[0044] The above are only the preferred specific embodiments of the present utility model; however, the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its improved conceptions, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. An inner hole fine boring tool, comprising a boring bar (1) and a tool handle (5), characterized in that: A boring blade (2) is mounted on the boring tool rod (1), and a connecting block (3) is fixedly connected to the top end of the boring tool rod (1), and a connecting tube (6) matching the connecting block (3) is fixedly connected to the bottom end of the tool handle (5), and a fixing assembly (7) is arranged on the connecting tube (6), and the fixing assembly (7) comprises a pair of mutually symmetrical limiting columns (703), and a pair of connecting holes (4) matching the limiting columns (703) are provided on the connecting block (3), and a plurality of positioning blocks (706) are arranged at the outer end of the limiting columns (703), and the plurality of positioning blocks (706) are arranged in a cross shape.

2. The inner hole fine boring tool according to claim 1, characterized in that: The connecting tube (6) is provided with a pair of mutually symmetrical limiting holes (8), the limiting column (703) is arranged in the inner cavity of the limiting hole (8), and the outer end of the limiting column (703) is sleeved with a first spring (704), the first spring (704) is located on the outer side of the connecting tube (6), and the two ends of the first spring (704) are respectively fixedly connected to the limiting column (703) and the connecting tube (6).

3. The inner hole fine boring tool according to claim 1, characterized in that: The fixing assembly (7) further comprises a limiting ring (701), the limiting ring (701) being rotatably connected to the connecting tube (6), and a pair of arc-shaped grooves (702) are formed at the inner end of the limiting ring (701), and the pair of arc-shaped grooves (702) are centrally symmetrical.

4. The inner hole fine boring tool according to claim 3, characterized in that: One end of the limiting column (703) located outside the connecting tube (6) is arranged inside the arc-shaped groove (702), and one end of the limiting column (703) abuts against the inner wall of the arc-shaped groove (702).

5. The inner hole fine boring tool according to claim 1, characterized in that: The outer end of the limiting column (703) is provided with a plurality of positioning grooves (705) matching the positioning block (706); the positioning block (706) is slidably connected to the inner wall of the positioning groove (705); and the shape of the positioning block (706) close to the inner end of the connecting tube (6) is set to be an arc; a second spring (707) is arranged in the positioning groove (705); and the two ends of the second spring (707) are respectively fixedly connected to the positioning block (706) and the inner wall of the positioning groove (705).

6. The inner hole fine boring tool according to claim 3, characterized in that: The fixing assembly (7) further comprises a fixing block (709), wherein the fixing block (709) is slidably connected to the connecting tube (6), and a fixing hole (708) matching the fixing block (709) is provided on the limiting ring (701).

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