A deburring tool for orifice

Abstract

The application discloses a hole burr removing and polishing tool, which comprises a clamping assembly and a polishing sandpaper sheet. The clamping assembly comprises a clamping mandrel, a clamping nut and a bearing push piece. The clamping mandrel is provided with a through groove and a slit. The slit is communicated with the through groove, and the lower part of the clamping mandrel is divided into two parts by the slit. The bearing push piece and the polishing sandpaper sheet are arranged in the through groove in a top-to-bottom relationship. The upper end of the bearing push piece is abutted against the top of the through groove, the lower end of the bearing push piece is abutted against the upper end of the polishing sandpaper sheet, and the lower end of the polishing sandpaper sheet is abutted against the bottom of the through groove. The clamping mandrel is threadedly connected with the clamping nut. When the clamping mandrel and the clamping nut are screwed together, the through groove is reduced, and the bearing push piece and the polishing sandpaper sheet are clamped. The clamping assembly is installed on the main shaft of a machine tool after clamping the polishing sandpaper sheet. The polishing sandpaper sheet is driven to rotate at a high speed by the high-speed rotation of the main shaft of the machine tool, and the hole burr is polished and removed without reducing the surface roughness of the hole wall from which the burr is removed.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and specifically to a polishing tool for removing burrs from orifices. Background Technology

[0002] Currently, in machining, after the holes on a workpiece are machined, slight burrs often remain at the hole openings. These burrs are usually removed using tools such as abrasive brushes, cutting tools, and drill bits. For example, the invention patent with publication number CN103111665A discloses a modified tool for removing burrs from hole openings. It includes a tool shank composed of a drill bit body extending forward and backward. The rear end of the tool shank is a clamping end for mounting on a drill chuck of a drilling machine. The front end of the tool shank is a thin neck section that is thinner than the front end of the tool shank. The outer peripheral surface of the thin neck section transitions to the outer peripheral surface of the front end of the tool shank through a head step surface. The head step surface is provided with an inner burr cutting edge facing backward for removing burrs from the inner hole openings of the workpiece. The head step surface is a chamfered surface, a right-angled surface, or a rounded concave surface. The tail step surface is also a chamfered surface, a right-angled surface, or a rounded concave surface. There is a gap between the head and tail step surfaces to correspond to the hole depth on the workpiece. In this existing technology, the tool holder is clamped onto the drill chuck of a drilling machine via the clamping end, and the tip of the tool holder extends through the inner hole of the part. By feeding the tool holder radially and rotating it relative to the part, the inner burr-cutting edge cuts the burrs on the edge of the inner hole, thus removing the burrs. However, for surfaces requiring high surface roughness, this modified tool scratches the hole wall surface while removing burrs, worsening the surface roughness of the hole wall.

[0003] Therefore, it is necessary to improve existing technologies. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a polishing tool for removing burrs from orifices. After the polishing sandpaper is clamped by a clamping assembly and mounted on the machine tool spindle, the high-speed rotation of the machine tool spindle drives the polishing sandpaper to rotate at high speed. When the polishing sandpaper slightly enters the orifice for pre-polishing and burr removal, the high-speed rotating polishing sandpaper polishes and removes the burrs without reducing the surface roughness of the orifice wall. Its structure is simple, and it is very convenient to install, remove, and operate.

[0005] To achieve the above objectives, the technical solution applied in this invention is as follows:

[0006] A tool for removing burrs from orifices and polishing includes a clamping assembly and a polishing sandpaper. The clamping assembly includes a clamping mandrel, a clamping nut, and a support pusher. The clamping mandrel has a through groove and a slit, which communicates with the through groove. The lower part of the clamping mandrel is cut into two halves. The support pusher and the polishing sandpaper are positioned vertically within the through groove. The upper end of the support pusher abuts against the top of the through groove, and the lower end of the support pusher abuts against the upper end of the polishing sandpaper. The lower end of the polishing sandpaper abuts against the bottom of the through groove. The clamping mandrel and the clamping nut are threadedly connected. When the clamping mandrel and the clamping nut are tightened together, the through groove is reduced, thereby clamping the support pusher and the polishing sandpaper.

[0007] According to the above scheme, the clamping mandrel includes a stepped shaft with a tapered surface. The clamping mandrel is provided with a machine tool chuck clamping part, an external thread part, an external tapered part and a polishing sandpaper clamping part from top to bottom. The upper end of the through groove is located at the external thread part, and the lower end of the through groove is located at the polishing sandpaper clamping part. The slit is located at the lower end of the through groove and communicates with the through groove. The external thread part and the external tapered part are respectively engaged with the inner hole of the clamping nut.

[0008] According to the above scheme, the clamping nut includes an external hexagonal nut. The interior of the clamping nut is provided with an internal threaded hole and an internal conical hole arranged in an upper and lower relationship. The internal conical hole and the internal threaded hole are coaxially arranged. The internal threaded hole and the external threaded part of the clamping mandrel are threadedly engaged. The internal conical hole and the external conical part of the clamping mandrel are conically engaged.

[0009] According to the above scheme, the width of the polishing sandpaper clamping part is at least 1.2 mm smaller than the diameter of the hole for pre-polishing to remove burrs, and the two sides of the polishing sandpaper clamping part are milled flat.

[0010] According to the above scheme, the through groove includes a T-shaped groove, and the width of the through groove is equal to twice the thickness of the polishing sandpaper sheet being held.

[0011] According to the above scheme, the width of the slit is 0.2 mm.

[0012] According to the above scheme, the bearing pusher includes a T-shaped thin plate, and the bearing pusher is provided with a large end and a small end. The width of the large end is smaller than the diameter of the internal thread hole of the clamping nut, and the width of the small end is smaller than the diameter of the small end of the internal conical hole of the clamping nut.

[0013] According to the above scheme, the thickness of the small end is less than the width of the through groove of the clamping mandrel, and it is thicker at the top and thinner at the bottom.

[0014] According to the above scheme, the combined length of the bearing pusher and the polishing sandpaper is equal to the length of the through groove.

[0015] According to the above scheme, the polishing sandpaper includes a first polishing sandpaper and a second polishing sandpaper, which are cut into small rectangles from sandpaper of appropriate grit. The back sides of the first polishing sandpaper and the second polishing sandpaper are placed against each other in the through groove. The length of the polishing sandpaper is 3mm-6mm longer than the diameter of the hole to be pre-polished to remove burrs.

[0016] Beneficial effects of this invention:

[0017] This invention employs a structure in which a polishing sandpaper sheet is clamped by a clamping assembly and mounted on a machine tool spindle. The high-speed rotation of the machine tool spindle drives the polishing sandpaper sheet to rotate at high speed. When the polishing sandpaper sheet approaches or slightly enters the hole for pre-polishing to remove burrs, the high-speed rotating polishing sandpaper sheet polishes and removes the burrs without reducing the surface roughness of the hole wall where the burrs are removed. The structure is simple, and loading, unloading, and operation are very convenient. Attached Figure Description

[0018] Figure 1 This is an elevation view of the overall structure of the invention;

[0019] Figure 2 This is a front view of the overall structure of the present invention;

[0020] Figure 3 yes Figure 2 Sectional view at position AA;

[0021] Figure 4 This is an elevation view of the clamping mandrel of the present invention;

[0022] Figure 5 This is a front view of the clamping mandrel of the present invention;

[0023] Figure 6 This is an elevation view of the clamping nut of the present invention;

[0024] Figure 7 This is a cross-sectional view of the clamping nut of the present invention;

[0025] Figure 8 This is an elevation view of the bearing pusher plate of the present invention;

[0026] Figure 9 This is a side view of the bearing pusher of the present invention.

[0027] In the diagram: 1. Clamping mandrel; 2. Clamping nut; 3. Bearing pusher; 4. Polishing sandpaper; 11. Machine tool chuck clamping part; 12. External thread part; 13. External tapered part; 14. Polishing sandpaper clamping part; 15. Through groove; 16. Slit; 21. Internal threaded hole; 22. Internal tapered hole; 31. Large end; 32. Small end. Detailed Implementation

[0028] The technical solution of the present invention will be described below with reference to the accompanying drawings and embodiments.

[0029] like Figures 1 to 9 As shown, the present invention discloses a polishing tool for removing burrs from orifices, comprising a clamping assembly and a polishing sandpaper 4. The clamping assembly includes a clamping mandrel 1, a clamping nut 2, and a bearing pusher 3. The clamping mandrel 1 is provided with a through groove 15 and a slit 16, which are connected to the through groove 15. The lower part of the clamping mandrel 1 is cut into two halves. The bearing pusher 3 and the polishing sandpaper 4 are arranged vertically within the through groove 15. The upper end of the bearing pusher 3 abuts against the top of the through groove 15, and the lower end of the bearing pusher 3 abuts against the upper end of the polishing sandpaper 4. The lower end of the polishing sandpaper 4 abuts against the bottom of the through groove 15. The clamping mandrel 1 and the clamping nut 2 are threadedly connected. When the clamping mandrel 1 and the clamping nut 2 are tightened together, the through groove 15 is reduced, thereby clamping the bearing pusher 3 and the polishing sandpaper 4.

[0030] In this embodiment, the clamping mandrel 1 includes a stepped shaft with a tapered surface. The clamping mandrel 1 is provided with a machine tool chuck clamping part 11, an external thread part 12, an external tapered part 13 and a polishing sandpaper clamping part 14 from top to bottom. The upper end of the through groove 15 is located at the external thread part 12, and the lower end of the through groove 15 is located at the polishing sandpaper clamping part 14. The slit 16 is located at the lower end of the through groove 15 and communicates with the through groove 15. The external thread part 12 and the external tapered part 13 respectively cooperate with the inner hole of the clamping nut 2.

[0031] In this embodiment, the clamping nut 2 includes an external hexagonal nut. The interior of the clamping nut 2 has an internally threaded hole 21 and an internally tapered hole 22 arranged vertically. The internally tapered hole 22 and the internally threaded hole 21 are coaxially aligned. The internally threaded hole 21 engages with the externally threaded portion 12 of the clamping mandrel 1 via a threaded pair, and the internally tapered hole 22 engages with the externally tapered portion 13 of the clamping mandrel 1 via a tapered surface. This allows the through-groove 15 to shrink when the clamping mandrel 1 and the clamping nut 2 are tightened, thanks to the engagement of the internally tapered hole 22 and the externally tapered portion 13.

[0032] In this embodiment, the width of the polishing sandpaper clamping part 14 is at least 1.2 mm smaller than the diameter of the hole for pre-polishing and deburring the orifice, and the two sides of the polishing sandpaper clamping part 14 are milled flat. This facilitates the polishing sandpaper clamping part 14 entering the orifice for pre-polishing and deburring the orifice.

[0033] In this embodiment, the through groove 15 includes a T-shaped groove, and the width of the through groove 15 is equal to twice the thickness of the polishing sandpaper 4 being held. In the initial state, this facilitates the loading and unloading of the polishing sandpaper 4 into the through groove 15.

[0034] In this embodiment, the width of the slit 16 is 0.2 mm. This is used to control the clamping displacement of the lower end of the through groove 15.

[0035] In this embodiment, the bearing pusher 3 includes a T-shaped thin sheet. The bearing pusher 3 has a large end 31 and a small end 32. The width of the large end 31 is smaller than the diameter of the internal threaded hole 21 of the clamping nut 2, and the width of the small end 32 is smaller than the diameter of the small end of the internal tapered hole 22 of the clamping nut 2. This allows the bearing pusher 3 to be placed in the through groove 15 without interfering with the clamping nut 2.

[0036] In this embodiment, the thickness of the small end 32 is less than the width of the through groove 15 of the clamping mandrel 1, and it is thicker at the top and thinner at the bottom. This allows the through groove 15 to clamp the bearing push plate 3 and the polishing sandpaper plate 4 when it is reduced and closed.

[0037] In this embodiment, the combined length of the bearing pusher 3 and the polishing sandpaper 4 is equal to the length of the through groove 15. After the bearing pusher 3 and the polishing sandpaper 4 are placed in the through groove 15, the upper end of the bearing pusher 3 abuts against the top of the through groove 15, the lower end of the bearing pusher 3 abuts against the upper end of the polishing sandpaper 4, and the lower end of the polishing sandpaper 4 abuts against the bottom of the through groove 15, resulting in a compact structure.

[0038] In this embodiment, the polishing sandpaper 4 includes a first polishing sandpaper slab and a second polishing sandpaper slab cut into small rectangles from sandpaper of a suitable grit. The back sides of the first and second polishing sandpaper slabs are placed against each other in the through groove 15. The length of the polishing sandpaper slab 4 is 3mm-6mm greater than the diameter of the hole to be pre-polished to remove burrs. When the polishing sandpaper slab 4 approaches or slightly enters the hole to be pre-polished to remove burrs, the burrs can be removed by the high-speed rotating polishing sandpaper slab 4 without reducing the surface roughness of the hole wall to which the burrs are removed.

[0039] Working principle of the invention:

[0040] Place the bearing pusher 3 into the through groove 15 of the clamping mandrel 1, with the upper end of the bearing pusher 3 abutting against the top of the through groove 15. Then place two back-to-back polishing sandpaper pieces 4 into the through groove 15 of the clamping mandrel 1, with the upper end of the polishing sandpaper pieces 4 abutting against the bearing pusher 3 and the lower end of the polishing sandpaper pieces 4 abutting against the bottom of the through groove 15. Then fit the clamping mandrel 1 with the clamping nut 2. When the clamping mandrel 1 is tightened clockwise, the conical surface of the inner conical hole 22 of the clamping nut 2 presses against the outer conical surface 13 of the clamping mandrel 1, causing the lower part of the clamping mandrel 1, which is divided into two halves, to contract inward, thereby firmly clamping the bearing pusher 3 and the two back-to-back polishing sandpaper pieces 4 located in the through groove 15. The machine tool chuck clamping part 11, which is installed on the machine tool spindle, clamps the clamping mandrel 1, and the polishing tool can then be installed on the machine tool. When the machine tool spindle rotates at high speed, the polishing tool drives the two back-to-back polishing sandpaper discs 4 clamped on it to rotate at high speed. The two back-to-back high-speed rotating polishing sandpaper discs 4 enter the hole to be polished and deburred, thus removing the burrs from the hole and polishing the hole. By selecting polishing sandpaper discs of appropriate grit, the burrs at the hole opening can be removed without reducing the surface roughness of the hole wall. When the clamping mandrel 1 is loosened counterclockwise, the conical surface of the inner conical hole 22 of the clamping nut 2 will loosen and the outer conical surface 13 of the clamping mandrel 1, which is in conical contact with it, will be released. This will cause the lower part of the clamping mandrel 1, which is cut into two halves, to open outward. The bearing pusher 3 and the two back-to-back polishing sandpaper discs 4 placed in the through groove 15 can be removed and replaced with new polishing sandpaper discs 4. Its structure is simple and its loading, unloading and operation are very convenient.

[0041] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other modifications under the guidance of the present invention without departing from the spirit and scope of the claims. All of these modifications are within the scope of protection of the present invention.

Claims

1. A deburring tool for removing burrs from an orifice, the deburring tool comprising: The device includes a clamping assembly and a polishing sandpaper disc (4). The clamping assembly includes a clamping mandrel (1), a clamping nut (2), and a bearing pusher (3). The clamping mandrel (1) has a through groove (15) and a slit (16). The slit (16) communicates with the through groove (15) to cut the lower part of the clamping mandrel (1) into two halves. The bearing pusher (3) and the polishing sandpaper disc (4) are arranged vertically within the through groove (15). The upper end of the plate (3) abuts against the top of the through groove (15), the lower end of the bearing push plate (3) abuts against the upper end of the polishing sandpaper plate (4), the lower end of the polishing sandpaper plate (4) abuts against the bottom of the through groove (15), the clamping spindle (1) is threadedly connected to the clamping nut (2), when the clamping spindle (1) and the clamping nut (2) are tightened together, the through groove (15) can be reduced, thereby clamping the bearing push plate (3) and the polishing sandpaper plate (4); The bearing pusher (3) includes a T-shaped thin sheet. The bearing pusher (3) has a large end (31) and a small end (32). The width of the large end (31) is smaller than the diameter of the internal thread hole (21) of the clamping nut (2). The width of the small end (32) is smaller than the diameter of the small end of the internal tapered hole (22) of the clamping nut (2). The thickness of the large end (31) is the same as the width of the through groove (15) of the clamping mandrel (1), and the thickness of the small end (32) is less than the width of the through groove (15) of the clamping mandrel (1), and it is thicker at the top and thinner at the bottom.

2. A deburring tool according to claim 1, wherein: The clamping mandrel (1) includes a stepped shaft with a tapered surface. The clamping mandrel (1) is provided with a machine tool chuck clamping part (11), an external thread part (12), an external tapered surface part (13), and a polishing sandpaper clamping part (14) from top to bottom. The upper end of the through groove (15) is located at the external thread part (12), and the lower end of the through groove (15) is located at the polishing sandpaper clamping part (14). The slit (16) is located at the lower end of the through groove (15) and communicates with the through groove (15). The external thread part (12) and the external tapered surface part (13) respectively cooperate with the inner hole of the clamping nut (2).

3. A deburring tool according to claim 2, wherein: The clamping nut (2) includes an external hexagonal nut. The interior of the clamping nut (2) is provided with an internal threaded hole (21) and an internal conical hole (22) arranged in an upper and lower relationship. The internal conical hole (22) is coaxially arranged with the internal threaded hole (21). The internal threaded hole (21) is threadedly engaged with the external threaded part (12) of the clamping mandrel (1). The internal conical hole (22) is conically engaged with the external conical part (13) of the clamping mandrel (1).

4. A deburring tool according to claim 2, wherein: The width of the polishing sandpaper clamping part (14) is at least 1.2 mm smaller than the diameter of the hole for pre-polishing to remove burrs, and the two sides of the polishing sandpaper clamping part (14) are milled flat.

5. A deburring tool according to claim 2, wherein: The through groove (15) includes a T-shaped groove, the width of which is equal to twice the thickness of the clamped polishing sandpaper sheet (4).

6. A deburring tool according to claim 2, wherein: The width of the slit (16) is 0.2 mm.

7. The deburring tool of claim 1, wherein: The combined length of the bearing pusher (3) and the polishing sandpaper (4) is equal to the length of the through groove (15).

8. The deburring tool of claim 1, wherein: The polishing abrasive paper sheet (4) comprises first and second polishing abrasive paper sheets cut into small rectangles from abrasive paper of suitable granularity, the back surfaces of the first and second polishing abrasive paper sheets abutting in the through slot (15), the length of the polishing abrasive paper sheet (4) being greater than the aperture diameter of 3-6 mm of the pre-polishing aperture burr removing hole.

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