Cutter

Abstract

The utility model discloses a cutter which is used for chamfering an orifice of a machining hole of a workpiece. The mandrel comprises a positioning part and a connecting part which are coaxially arranged along the central axis of the mandrel. The diameter of the section, perpendicular to the central axis, of the positioning part is larger than that of the section, perpendicular to the central axis, of the connecting part. The size of the positioning part is matched with the size of the machining hole, and an abutting face is arranged at the connecting position of the positioning part and the connecting part. And the knife sleeve is sleeved on the connecting part. The cutter sleeve comprises a cutting part, and the cutting part is connected to the abutting face in an abutting mode. The positioning part is arranged to be inserted into the machining hole, and the cutter sleeve is arranged to rotate around the central axis relative to the connecting part so that the cutting part can conduct chamfering machining on an orifice of the machining hole. The cutter is favorable for improving the positioning precision.

Description

Technical Field

[0001] The present application relates to the field of machining technology, and in particular to a cutting tool. Background Art

[0002] When chamfering the opening of a workpiece's machining hole, the tool is usually aligned with the opening of the machining hole by visual observation, which can easily cause a deviation between the center axis of the tool and the hole axis of the machining hole, resulting in poor concentricity between the tool and the machining hole and the tool is prone to wobble during rotation, resulting in poor positioning accuracy. Utility Model Content

[0003] In view of the above situation, the present application provides a tool that is conducive to improving positioning accuracy.

[0004] An embodiment of the present application provides a tool for chamfering the opening of a machining hole of a workpiece. The tool includes a mandrel and a tool sleeve. The mandrel includes a positioning portion and a connecting portion coaxially arranged along its central axis. The diameter of the cross section of the positioning portion perpendicular to the central axis is greater than the diameter of the cross section of the connecting portion perpendicular to the central axis. The size of the positioning portion is adapted to the size of the machining hole, and the connection between the positioning portion and the connecting portion has an abutment surface. The tool sleeve is sleeved on the connecting portion. The tool sleeve includes a cutting portion, and the cutting portion abuts against the abutment surface. The positioning portion is configured to be inserted into the machining hole, and the tool sleeve is configured to rotate relative to the connecting portion around the central axis so that the cutting portion can chamfer the opening of the machining hole.

[0005] In some embodiments of the present application, the tool further includes a limiting member, which is connected to the connecting portion and abuts against the tool sleeve so that the tool sleeve is clamped between the limiting member and the positioning portion.

[0006] In some embodiments of the present application, the limiting member and the connecting portion are provided with a communicating limiting hole, and the hole axis of the limiting hole is perpendicular to the central axis. The tool further includes a limiting pin, and the limiting pin is inserted into the limiting hole.

[0007] In some embodiments of the present application, the cutting portion includes a first conical surface, the first conical surface is provided with multiple cutting edges and multiple chip grooves, the multiple cutting edges are distributed at equal intervals on the first conical surface around the central axis, and each chip groove is located on one side of one of the cutting edges.

[0008] In some embodiments of the present application, the knife sleeve further includes a first end surface, the first end surface is located on one side of the first conical surface, and the connecting portion passes through the first end surface. The abutting surface abuts the first end surface, and the abutting surface and the first end surface are respectively perpendicular to the central axis.

[0009] In some embodiments of the present application, the tool sleeve further comprises a first outer wall arranged around the central axis, the first outer wall being located on a side of the first conical surface away from the first end surface. One end of the chip removal groove extends to the first end surface, and the other end of the chip removal groove extends to the first outer wall.

[0010] In some embodiments of the present application, when viewed along a direction perpendicular to the central axis, an angle between the first conical surface and the central axis is an acute angle.

[0011] In some embodiments of the present application, the positioning portion further includes a first outer peripheral surface, and along a direction perpendicular to the central axis, the first outer peripheral surface is configured to have a gap with the hole wall of the processed hole that is less than or equal to 0.015 mm.

[0012] In some embodiments of the present application, the positioning portion further comprises a guide surface, which is located on a side of the first peripheral surface away from the abutting surface along the axial direction of the central axis. The guide surface is arranged in a conical surface and is configured to guide the first peripheral surface into the processing hole.

[0013] In some embodiments of the present application, the knife sleeve is provided with a sleeve hole extending axially along the central axis, and the connecting portion passes through the sleeve hole. The connecting portion includes a second outer peripheral surface, and along a direction perpendicular to the central axis, a gap between the second outer peripheral surface and a hole wall of the sleeve hole is less than or equal to 0.01 mm.

[0014] In the above-mentioned tool, the mandrel includes a positioning part and a connecting part coaxially arranged along the central axis, the size of the positioning part is adapted to the size of the processing hole, and the positioning part is inserted into the processing hole so that the central axis is coaxially arranged with the hole axis of the processing hole. The tool sleeve is arranged on the connecting part, and the cutting part abuts against the abutting surface. The cutting part is used to chamfer the orifice of the processing hole. The tool sleeve drives the cutting part to rotate around the central axis to improve the concentricity of the cutting part and the processing hole and reduce the risk of the tool swinging during the rotation process, thereby improving the positioning accuracy of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of a tool processing product in one embodiment of the present application.

[0016] Figure 2 It is a schematic diagram of the structure in which a tool and a product are separated in one embodiment of the present application.

[0017] Figure 3 yes Figure 1 Sectional view along section line III-III.

[0018] Figure 4It is a schematic diagram of the disassembled structure of a tool in an embodiment of the present application.

[0019] Figure 5 It is a schematic diagram of the structure of a knife sheath of a knife in one embodiment of the present application.

[0020] Main component symbols

[0021] Knife 100

[0022] Mandrel 10

[0023] Center axis L

[0024] Positioning unit 11

[0025] The first outer peripheral surface 111

[0026] Guide surface 112

[0027] Connecting part 12

[0028] The second outer peripheral surface 121

[0029] Abutment surface 13

[0030] Knife set 20

[0031] Socket hole 20a

[0032] Cutting part 21

[0033] First cone surface 211

[0034] First boundary line 211a

[0035] Second boundary line 211b

[0036] Blade 212

[0037] The first reference line S

[0038] Chip groove 213

[0039] First wall 213a

[0040] Second wall 213b

[0041] First end surface 22

[0042] First outer wall 23

[0043] Second outer wall 24

[0044] Limiting piece 30

[0045] Connection hole 30a

[0046] Limiting hole 30b

[0047] Limit pin 40

[0048] Workpiece 90

[0049] Processing hole 91

[0050] Orifice 911

[0051] First direction Z

[0052] The following specific implementation methods will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0054] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centrally disposed element at the same time. When an element is considered to be "disposed" on another element, it may be directly disposed on the other element or there may be a centrally disposed element at the same time.

[0055] The term "perpendicular" is used to describe the ideal state between two components. In actual production or use, there may be a state that is approximately perpendicular between the two components. For example, combined with numerical descriptions, perpendicularity can refer to the angle between two straight lines being between 90°±10°, perpendicularity can also refer to the dihedral angle between two planes being between 90°±10°, and perpendicularity can also refer to the angle between a straight line and a plane being between 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0057] The embodiments of the present application are further described below in conjunction with the accompanying drawings.

[0058] Please also read Figure 1 and Figure 2 An embodiment of the present application provides a tool 100 for chamfering an opening 911 of a machining hole 91 of a workpiece 90. Optionally, the machining hole 91 is a through hole or a blind hole.

[0059] The tool 100 includes a mandrel 10 and a tool sleeve 20. The mandrel 10 is used to be inserted into the processing hole 91 to improve the positioning accuracy of the tool sleeve 20 and the processing hole 91. The tool sleeve 20 is used to rotate relative to the mandrel 10 to chamfer the orifice 911 of the processing hole 91.

[0060] Please also read Figure 3 , the mandrel 10 has a central axis L extending along a first direction Z. The mandrel 10 includes a positioning portion 11 and a connecting portion 12 coaxially arranged along the central axis L. Along the first direction Z, the projection of the connecting portion 12 is located within the projection range of the positioning portion 11, so as to facilitate the connection of the tool sleeve 20. Specifically, the positioning portion 11 is cylindrical, and the connecting portion 12 is rod-shaped. The diameter of the cross section of the positioning portion 11 perpendicular to the central axis L is greater than the diameter of the cross section of the connecting portion 12 perpendicular to the central axis L. The size of the positioning portion 11 is adapted to the size of the machining hole 91, and the positioning portion 11 is configured to be inserted into the machining hole 91 so that the central axis L is coaxially arranged with the hole axis of the machining hole 91.

[0061] The connection between the positioning portion 11 and the connecting portion 12 has a supporting surface 13. Specifically, along the first direction Z, the projection of the connecting portion 12 is circular, the central axis L passes through the center of the circle, and the projection of the supporting surface 13 is an annular shape concentric with the circle.

[0062] The knife sleeve 20 is sleeved on the connecting portion 12. Specifically, the knife sleeve 20 is provided with a sleeve hole 20a penetrating along the first direction Z. The connecting portion 12 passes through the sleeve hole 20a, and the knife sleeve 20 can rotate around the central axis L relative to the connecting portion 12.

[0063] The tool sleeve 20 includes a cutting portion 21, the cutting portion 21 abuts against the abutting surface 13, and the cutting portion 21 is adjacent to the positioning portion 11 in the first direction Z. The abutting surface 13 is used to support the tool sleeve 20 in the first direction Z. The tool sleeve 20 is configured to rotate relative to the connecting portion 12 around the central axis L so that the cutting portion 21 performs chamfering on the orifice 911 of the processing hole 91.

[0064] In the above-mentioned tool 100, the core shaft 10 includes a positioning portion 11 and a connecting portion 12 coaxially arranged along the central axis L. The size of the positioning portion 11 is adapted to the size of the processing hole 91. The positioning portion 11 is inserted into the processing hole 91 so that the central axis L is coaxially arranged with the hole axis of the processing hole 91. The tool sleeve 20 is sleeved on the connecting portion 12, and the cutting portion 21 abuts against the abutting surface 13. The cutting portion 21 is used to chamfer the orifice 911 of the processing hole 91. The tool sleeve 20 drives the cutting portion 21 to rotate around the central axis L to improve the concentricity of the cutting portion 21 and the processing hole 91 and reduce the risk of the tool 100 generating a wobble during the rotation process, thereby improving the positioning accuracy of the tool 100.

[0065] When the tool 100 is used, the positioning portion 11 is first inserted into the processing hole 91; the connecting portion 12 is then pushed along the first direction Z to make the cutting portion 21 contact the orifice 911 of the processing hole 91; the tool sleeve 20 is driven by an external force to rotate relative to the connecting portion 12 around the central axis L so that the cutting portion 21 cuts the orifice 911 of the processing hole 91; the connecting portion 12 is then pushed along the first direction Z to control the moving distance of the cutting portion 21 relative to the processing hole 91 so that the orifice 911 of the processing hole 91 forms a chamfered surface of a preset length. The tool 100 can solve the problems of uneven size, knife marks or burrs on the chamfered surface.

[0066] It is understandable that during the use of the tool 100, the positioning portion 11 moves relative to the processing hole 91 in the first direction Z, but remains stationary relative to the processing hole 91 in other directions. For example, it does not rotate relative to the processing hole 91, so as to reduce the risk of the positioning portion 11 damaging the hole wall of the processing hole 91.

[0067] Please also read Figure 3 and Figure 4 In some embodiments, the positioning portion 11 also includes a first outer peripheral surface 111. Along a direction perpendicular to the central axis L (i.e., a direction perpendicular to the first direction Z), the first outer peripheral surface 111 is configured to have a gap with the hole wall of the processing hole 91 that is less than or equal to 0.015 mm, so that the size of the positioning portion 11 is compatible with the size of the processing hole 91, and it is convenient for the positioning portion 11 and the processing hole 91 to meet the processing tolerance requirements.

[0068] Optionally, the first outer peripheral surface 111 is configured to have a gap with the wall of the processed hole 91 of 0, 0.001mm, 0.002mm, 0.003mm, 0.004mm, 0.005mm, 0.006mm, 0.007mm, 0.008mm, 0.009mm, 0.010mm, 0.011mm, 0.012mm, 0.013mm, 0.014mm, 0.015m, and any other value in the range of 0 to 0.015mm.

[0069] In some embodiments, the positioning portion 11 also includes a guide surface 112, which is located on the side of the first outer peripheral surface 111 away from the connecting portion 12 along the axial direction of the center axis L (i.e., the first direction Z). The guide surface 112 is arranged in a conical surface and is configured to guide the first outer peripheral surface 111 into the processing hole 91.

[0070] Optionally, the included angle between the guide surface 112 and the central axis L may be one of other angles such as 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0071] Please also read Figure 3 and Figure 4In some embodiments, the connecting portion 12 includes a second outer peripheral surface 121, and along a direction perpendicular to the central axis L, a gap between the second outer peripheral surface 121 and the hole wall of the sleeve hole 20a is less than or equal to 0.01 mm, so as to limit the concentricity of the cutting portion 21 and the processing hole 91 to within 0.02 mm, and facilitate the connection portion 12 and the sleeve hole 20a to meet the processing tolerance requirements.

[0072] Optionally, the gap between the second outer peripheral surface 121 and the hole wall of the sleeve hole 20a can be 0, 0.001mm, 0.002mm, 0.003mm, 0.004mm, 0.005mm, 0.006mm, 0.007mm, 0.008mm, 0.009mm, 0.01mm, and any other value in the range of 0 to 0.01mm.

[0073] Furthermore, the clearance between the second outer peripheral surface 121 and the hole wall of the sleeve hole 20a is 0.008 mm to 0.01 mm, so as to further facilitate the connection portion 12 and the sleeve hole 20a to meet the processing tolerance requirements. In addition, it is helpful to reduce the friction between the second outer peripheral surface 121 and the hole wall of the sleeve hole 20a when the knife sleeve 20 rotates relative to the connection portion 12, and improve the stability of the knife sleeve 20 rotating relative to the connection portion 12.

[0074] It can be understood that in other embodiments, the gap between the second outer peripheral surface 121 and the hole wall of the sleeve hole 20a is filled with lubricant to reduce the friction between the second outer peripheral surface 121 and the hole wall of the sleeve hole 20a when the tool sleeve 20 rotates relative to the connecting part 12, thereby improving the stability of the rotation of the tool sleeve 20 relative to the connecting part 12.

[0075] Please also read Figure 4 and Figure 5 In some embodiments, the cutting portion 21 includes a first conical surface 211, and the first conical surface 211 is provided with a plurality of blades 212 and a plurality of chip grooves 213. The plurality of blades 212 are distributed at equal intervals on the first conical surface 211 around the central axis L to improve the cutting stability. Each chip groove 213 is located on one side of a blade 212, and the chip groove 213 is used to discharge the debris generated by the corresponding blade 212 during the cutting process.

[0076] Specifically, the chip groove 213 includes a first wall 213a and a second wall 213b that are oppositely arranged. The first wall 213a is arranged in a plane, and the blade 212 is formed at the end of the first wall 213a so that the blade 212 contacts the orifice 911 of the processing hole 91. The second wall 213b is arranged in an arc surface so as to gather and discharge the chips.

[0077] In some embodiments, the number of the cutting edges 212 is four, and the number of the corresponding chip flutes 213 is also four.

[0078] Optionally, the number of the blades 212 may also be 1, 2, 3, 5, 6, etc., and correspondingly, the number of the chip grooves 213 is equal to the number of the blades 212.

[0079] In some embodiments, when viewed along a direction perpendicular to the central axis L, the included angle between the first conical surface 211 and the central axis L is an acute angle, so as to form a chamfered surface on the orifice 911 of the processed hole 91 .

[0080] Optionally, the angle between the first conical surface 211 and the central axis L can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, and other acute angles.

[0081] In some embodiments, the knife sleeve 20 further includes a first end surface 22, the first end surface 22 is located on one side of the first conical surface 211, the sleeve hole 20a passes through the first end surface 22, and the connecting portion 12 passes through the first end surface 22. The abutting surface 13 abuts against the first end surface 22, and the abutting surface 13 and the first end surface 22 are respectively perpendicular to the central axis L, which is conducive to improving the stability of the abutting surface 13 supporting the knife sleeve 20 in the first direction Z, thereby improving the stability of the knife sleeve 20 rotating around the central axis L relative to the connecting portion 12.

[0082] It is understandable that in other embodiments, a bearing or a coating is provided between the abutting surface 13 and the first end surface 22 to reduce the friction between the abutting surface 13 and the first end surface 22 and improve the stability of the rotation of the tool sleeve 20 relative to the connecting portion 12 .

[0083] In some embodiments, the tool sleeve 20 also includes a first outer wall 23 arranged around the central axis L, and the first outer wall 23 is located on the side of the first conical surface 211 away from the first end surface 22. One end of the chip groove 213 extends to the first end surface 22, and the other end of the chip groove 213 extends to the first outer wall 23, so that the chip groove 213 can discharge debris from the first outer wall 23, thereby reducing the risk of debris interfering with the cutting part 21.

[0084] Please also read Figure 4 and Figure 5 In some embodiments, a first boundary line 211a is provided between the first conical surface 211 and the first end surface 22, and a second boundary line 211b is provided between the first conical surface 211 and the first outer wall 23. The blade 212 extends from the first boundary line 211a to the second boundary line 211b in a straight line direction. A first reference line S is defined to extend radially along the central axis L to the intersection of the blade 212 and the second boundary line 211b. The extension direction of the blade 212 is inclined relative to the extension direction of the first reference line S, so as to increase the length of the blade 212, thereby increasing the cutting area of ​​the cutting portion 21.

[0085] Optionally, the inclination angle of the extension direction of the blade 212 relative to the extension direction of the first reference line S can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 65° or other angles.

[0086] In some embodiments, the knife sleeve 20 also includes a second outer wall 24, which is located on the side of the first outer wall 23 away from the first conical surface 211. The second outer wall 24 is configured to rotate under the drive of an external force, thereby driving the knife sleeve 20 to rotate around the central axis L relative to the connecting portion 12.

[0087] Along the first direction Z, the projection of the first outer wall 23 is located within the projection of the second outer wall 24 to facilitate receiving external force. Specifically, along the first direction Z, the projection of the first outer wall 23 is a circle, the central axis L passes through the center of the circle, and the projection of the second outer wall 24 is a circle concentrically arranged with the circle.

[0088] In some embodiments, the tool 100 further includes a stopper 30. The stopper 30 is connected to the connection portion 12 and is spaced apart from the positioning portion 11. The tool sleeve 20 is clamped between the stopper 30 and the positioning portion 11 in the first direction Z, so as to limit the position between the tool sleeve 20 and the positioning portion 11 and improve the positioning accuracy of the tool 100.

[0089] Please also read Figure 1 and Figure 3 In some embodiments, the stopper 30 is provided with a connecting hole 30a extending along the first direction Z, the connecting portion 12 passes through the connecting hole 30a, the stopper 30 and the connecting portion 12 are provided with a stopper hole 30b, and the hole axis of the stopper hole 30b is perpendicular to the central axis L. The tool 100 further includes a stopper pin 40, which is inserted into the stopper hole 30b, so that the stopper 30 is detachably connected to the connecting portion 12, thereby facilitating the removal or replacement of the tool sleeve 20.

[0090] It is understandable that in other embodiments, the limiting member 30 is connected to the connecting portion 12 by means of snaps, threads, etc.

[0091] In summary, in the above-mentioned tool 100, the core shaft 10 includes a positioning portion 11 and a connecting portion 12 coaxially arranged along the central axis L. The size of the positioning portion 11 is adapted to the size of the processing hole 91. The positioning portion 11 is inserted into the processing hole 91 so that the central axis L is coaxially arranged with the hole axis of the processing hole 91. The tool sleeve 20 is sleeved on the connecting portion 12, and the cutting portion 21 abuts against the abutting surface 13. The cutting portion 21 is used to chamfer the orifice 911 of the processing hole 91. The tool sleeve 20 drives the cutting portion 21 to rotate around the central axis L to improve the concentricity of the cutting portion 21 and the processing hole 91 and reduce the risk of the tool 100 generating a wobble during the rotation process, thereby improving the positioning accuracy of the tool 100.

[0092] In addition, those skilled in the art may also make other changes within the spirit of the present application. Of course, these changes made according to the spirit of the present application should be included in the scope disclosed in the present application.

Claims

1. A tool for chamfering the opening of a machining hole of a workpiece, characterized in that: The tool comprises: The mandrel comprises a positioning portion and a connecting portion coaxially arranged along the central axis thereof, the diameter of the cross section of the positioning portion perpendicular to the central axis being larger than the diameter of the cross section of the connecting portion perpendicular to the central axis, the size of the positioning portion being adapted to the size of the machined hole, and abutting surfaces being provided at the connection between the positioning portion and the connecting portion; The tool sleeve is sleeved on the connecting portion, the tool sleeve includes a cutting portion, the cutting portion abuts against the abutting surface, the positioning portion is configured to be inserted into the processing hole, and the tool sleeve is configured to rotate around the central axis relative to the connecting portion so that the cutting portion chamfers the opening of the processing hole.

2. The tool according to claim 1, characterized in that The tool further comprises a limiting member, wherein the limiting member is connected to the connecting portion and abuts against the tool sleeve, so that the tool sleeve is clamped between the limiting member and the positioning portion.

3. The tool according to claim 2, characterized in that The limiting member and the connecting portion are provided with a communicating limiting hole, and the hole axis of the limiting hole is perpendicular to the central axis; The tool also includes a limiting pin, and the limiting pin is inserted into the limiting hole.

4. The tool according to claim 1, characterized in that The cutting portion includes a first conical surface, the first conical surface is provided with a plurality of cutting edges and a plurality of chip removal grooves, the plurality of cutting edges are distributed on the first conical surface at equal intervals around the central axis, and each of the chip removal grooves is located on one side of one of the cutting edges.

5. The tool according to claim 4, characterized in that The knife sleeve further includes a first end surface, the first end surface is located on one side of the first conical surface, and the connecting portion passes through the first end surface; The abutting surface abuts against the first end surface, and the abutting surface and the first end surface are respectively perpendicular to the central axis.

6. The tool according to claim 5, characterized in that The tool sleeve also includes a first outer wall arranged around the central axis, the first outer wall is located on the side of the first conical surface away from the first end surface, one end of the chip groove extends to the first end surface, and the other end of the chip groove extends to the first outer wall.

7. The tool according to claim 4, characterized in that When viewed in a direction perpendicular to the central axis, the angle between the first conical surface and the central axis is an acute angle.

8. The tool according to claim 1, characterized in that The positioning portion further includes a first outer peripheral surface, and along a direction perpendicular to the central axis, the first outer peripheral surface is configured to have a gap with a hole wall of the processed hole that is less than or equal to 0.015 mm.

9. The tool according to claim 8, characterized in that The positioning portion further includes a guide surface, which is located on a side of the first outer peripheral surface away from the abutting surface along the axial direction of the central axis. The guide surface is arranged in a conical surface and is configured to guide the first outer peripheral surface into the processing hole.

10. The tool according to claim 1, characterized in that The knife sleeve is provided with a sleeve hole which penetrates axially along the central axis, and the connecting portion passes through the sleeve hole; The connecting portion includes a second outer peripheral surface, and along a direction perpendicular to the central axis, a gap between the second outer peripheral surface and a hole wall of the sleeve hole is less than or equal to 0.01 mm.

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