Micro-diameter internal hole grooving tool

Abstract

This utility model provides a micro-diameter internal hole grooving tool, including a tool holder, a tool head at the front end of the tool holder, and a flat transition shank between the tool holder and the tool head. The tool head is a semi-cone, laterally positioned on the side of the front end of the transition shank. A cutting edge is provided on the large end of the tool head, and the large end face and the side of the transition shank form a rake face. The top surface of the transition shank forms a clearance angle face. The angle β1 between the intersection of the clearance angle face and the rake face and the radial direction is 5°. The angle β2 between the generatrix of the tool head side and the axial section is 4°. This utility model is designed for workpieces requiring grooving in small diameter holes, employing a targeted reinforced clearance design and a reinforced clearance angle configuration, suitable for machining and forming small-diameter internal holes.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a micro-diameter internal hole grooving tool. Background Technology

[0002] In the mechanical field, some parts with internal holes require grooving on the inner hole walls. Examples include precision shaft parts, electronic product components, and medical device parts. The inner hole size is generally <1.0mm, which is very small and requires the use of an internal grooving tool for machining. Existing internal grooving tools, such as the one disclosed in patent announcement number CN208408576U, have their cutting inserts directly mounted on one side of the front end of a prismatic tool holder. Due to the limitations of the tool holder size, this structure cannot meet the needs of grooving small-diameter internal holes. Therefore, it is necessary to improve the existing internal grooving tools to solve the above problems. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a micro-diameter internal hole grooving tool.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a micro-diameter internal hole grooving tool, including a tool holder, a tool head at the front end of the tool holder, a flat transition shank between the tool holder and the tool head, the tool head being a semi-cone, laterally disposed on the side of the front end of the transition shank, a cutting edge on the large end of the tool head, and the large end face forming a front cutting face with the side of the transition shank, the top surface of the transition shank forming a rear angle face, the rear angle face forming a radial angle β1 of 5°, and the angle β2 between the generatrix of the side of the tool head and the axial section of 4°.

[0005] Preferably, the blade width L4 is 0.6mm, the blade thickness is H2-H1=0.35mm, H1 is the thickness of the transition shank, and H2 is the total thickness of the transition shank and the large end of the blade head.

[0006] Preferably, the radius R2 of the blade is 0.3±0.02mm.

[0007] Furthermore, a tapered portion is provided between the transition shank and the tool holder, and the transition shank and the tapered portion are connected by an arc transition, with the included angle α1 between the outer side of the tapered portion and the axis being 60°. Preferably, the radius R1 of the arc used for the transition is 1.0 mm.

[0008] Furthermore, a chip removal groove is formed between the cutter head and the cutter shank.

[0009] Furthermore, the front end of the tool holder is radially inclined to form a beveled plane, and the front end of the beveled plane is axially cut to form an axial section. The sides of the beveled plane and the axial section together form a relief groove.

[0010] Preferably, the angle α2 between the oblique plane and the axial section is 45°.

[0011] Furthermore, the side of the tool holder is cut along the axial direction to form an anti-rotation surface, and the anti-rotation surface is connected to the inclined plane along the axial direction.

[0012] Furthermore, the rear corner face is triangular in shape, and the left side of the rear corner face includes a first side segment and a second side segment. The angle γ1 between the first side segment and the axial section is smaller than the angle γ2 between the second side segment and the axial section. The angle γ3 between the right side of the rear corner face and the axial section is smaller than the angle γ1 between the first side segment and the axial section.

[0013] The beneficial effects of this utility model are: (1) The semi-conical cutting head increases the back angle and has a reinforced back angle configuration, which is suitable for grooving of small diameter inner holes; (2) The conical structure of the cutter head also facilitates chip removal; (3) The rear corner face is inclined to form an angle with the radial direction, so that the rear end of the cutter head (i.e. the side away from the cutting edge) is higher than the cutting edge, thus avoiding the influence of the cutter head thickness on the groove shape and facilitating chip removal; (4) The tool relief groove is specially reinforced with a clearance design to facilitate machining and tool retraction; (5) Use circular arcs and tapered transitions to reduce stress concentration while ensuring rigidity; (6) A transition shank is added to the front end of the tool holder, which can reduce the radial dimension of the front end of the tool tip and meet the requirements for machining small internal holes. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a schematic diagram of the main structure of the micro-diameter inner hole grooving tool of this utility model.

[0016] Figure 2 yes Figure 1 Enlarged structural diagram of the middle cutter head position.

[0017] Figure 3 yes Figure 1 Enlarged structural diagram of the middle cutter head position.

[0018] Figure 4 This is a top view schematic diagram of the micro-diameter inner hole grooving tool of this utility model.

[0019] Figure 5 This is a right-side structural schematic diagram of the micro-diameter inner hole grooving tool of this utility model.

[0020] Figure 6This is a bottom view of the micro-diameter inner hole grooving tool of this utility model.

[0021] Figure 7 yes Figure 6 A magnified structural diagram of point A in the middle.

[0022] Figure 8 yes Figure 6 A magnified structural diagram of point A in the middle.

[0023] In the diagram: 1. Tool holder, 2. Beveled plane, 3. Anti-rotation surface, 4. Axial plane, 5. Transition shank, 6. Tool tip, 7. Cutting edge, 8. Rake face, 9. Clearance face, 91. First side section, 92. Second side section, 93. Right side, 10. Relief groove, 11. Chip removal groove, 12. Arc, 13. Tapered section. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figures 1-5As shown, this utility model discloses a micro-diameter internal hole grooving tool, including a handle 1. The side of the handle 1 is axially cut to form an anti-rotation surface 3, which is axially connected to a chamfered plane 2. A cutting head 6 is provided at the front end of the handle 1. A flat transition shank 5 is also provided between the handle 1 and the cutting head 6. The cutting head 6 is a semi-cone, laterally positioned on the side of the front end of the transition shank 5. A cutting edge 7 is provided on the large end of the cutting head 6, and the large end face and the side of the transition shank 5 form a front cutting face 8. The top surface of the transition shank 5 forms a back angle face 9. The front end of the handle 1 is radially inclined to form a chamfered plane 2. The front end of the handle 1 at the chamfered plane 2 is axially cut to form an axial section plane 4. The sides of the chamfered plane 2 and the axial section plane 4 together form a relief groove 10. A chip removal groove 11 is formed between the cutting head 6 and the handle 1.

[0028] like Figure 1 As shown, in this embodiment, the overall length L1 of the tool is 40mm, the length L2 from the axial section plane 4 to the top of the tool head 6 is 4.5mm, and the length L3 from the transition shank 5 to the top of the tool head 6 is 2.0mm. Figure 2 and Figure 3 As shown, the angle β1 between the intersection of the rear face 9 and the front face 8 and the radial direction is 5°, and the angle β2 between the generatrix of the side of the cutter head 6 and the axial section is 4°. Preferably, the blade width L4 of the cutting edge 7 is 0.6mm, the blade thickness of the cutting edge 7 is H2-H1=0.35mm, H1 is the thickness of the transition shank 5, and H2 is the total thickness of the transition shank 5 and the large end of the cutter head 6. Preferably, the radius R2 of the cutting edge 7 is 0.3±0.02mm. A tapered portion 13 is provided between the transition shank 5 and the cutter shank 1, and the transition shank 5 and the tapered portion 13 are connected by an arc 12. The angle α1 between the outer side of the tapered portion 13 and the axis is 60°. Preferably, the radius R1 of the arc 12 used for transition is 1.0mm. Preferably, the angle α2 between the oblique plane 2 and the axial section is 45°.

[0029] like Figures 6-8 As shown, the rear corner facet 9 is generally triangular in shape, and the left side of the rear corner facet 9 includes a first side 91 and a second side 92. The angle γ1 between the first side 91 and the axial section is smaller than the angle γ2 between the second side 92 and the axial section. The angle γ3 between the right side 93 and the axial section is smaller than the angle γ1 between the first side 91 and the axial section. Preferably, γ1 ranges from 10° to 14°, γ2 ranges from 15° to 20°, and γ3 ranges from 7° to 10°. In this embodiment, γ1 is 11°, γ2 is 17°, and γ3 is 9°. The height L5 of the first side 91 is 0.9 mm, and the height of the second side 92 is L6 - L5 = 1.67 mm - 0.9 mm = 0.77 mm, where L6 is the sum of the heights of the first side 91 and the second side 92.

[0030] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A micro-diameter internal hole grooving tool, characterized in that: The tool includes a handle, a cutting head at the front end of the handle, and a flat transition shank between the handle and the cutting head. The cutting head is a semi-cone, laterally positioned on the side of the front end of the transition shank. The large end of the cutting head has a cutting edge, and the large end face and the side of the transition shank form a front cutting face. The top surface of the transition shank forms a back angle face. The angle β1 between the intersection of the back angle face and the front cutting face and the radial direction is 5°. The angle β2 between the generatrix of the side of the cutting head and the axial section is 4°.

2. The micro-diameter internal hole grooving tool as described in claim 1, characterized in that: The blade width L4 is 0.6mm, and the blade thickness is H2-H1=0.35mm, where H1 is the thickness of the transition shank and H2 is the total thickness of the transition shank and the large end of the blade head.

3. The micro-diameter internal hole grooving tool as described in claim 2, characterized in that: The radius R2 of the blade is 0.3±0.02mm.

4. The micro-diameter internal hole grooving tool as described in claim 1, characterized in that: A tapered section is provided between the transition shank and the tool holder, and the transition shank and the tapered section are connected by an arc transition. The included angle α1 between the outer side of the tapered section and the axis is 60°.

5. The micro-diameter internal hole grooving tool as described in claim 1, characterized in that: A chip removal groove is formed between the cutter head and the cutter handle.

6. The micro-diameter internal hole grooving tool as described in claim 1, characterized in that: The front end of the tool holder is cut radially to form a beveled plane, and the front end of the beveled plane is cut axially to form an axial section. The sides of the beveled plane and the axial section together form a relief groove.

7. The micro-diameter internal hole grooving tool as described in claim 6, characterized in that: The angle α2 between the oblique plane and the axial section is 45°.

8. The micro-diameter internal hole grooving tool as described in claim 1, characterized in that: The side of the tool holder is cut along the axial direction to form an anti-rotation surface, and the anti-rotation surface is connected to the inclined plane along the axial direction.

9. The micro-diameter internal hole grooving tool as described in claim 1, characterized in that: The rear corner face is triangular in shape, and the left side of the rear corner face includes a first side and a second side. The angle γ1 between the first side and the axial section is smaller than the angle γ2 between the second side and the axial section. The angle γ3 between the right side of the rear corner face and the axial section is smaller than the angle γ1 between the first side and the axial section.

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