Cutter

Abstract

The utility model provides a cutter, which relates to the technical field of hardware tools and comprises a blade, a cutter bar and a fixing component, the blade is provided with a blade radial positioning surface and a blade axial interference surface, the cutter bar is provided with a blade groove for inserting the blade, and a cutter bar axial interference surface and a cutter bar radial positioning surface are arranged in the blade groove. The axial interference surface of the blade is in conical surface fit with the axial interference surface of the cutter bar, the radial positioning surface of the blade is in contact with the radial positioning surface of the cutter bar to realize in-place assembly, the fixing component is mounted on the cutter bar, and the fixing component is used for abutting against the blade for fixation. When the blade is installed, the interference face and the positioning face which are arranged on the blade and the cutter bar respectively are used for improving the clamping stability, the fixing effect of the blade is achieved in cooperation with abutting of the fixing assembly, the design of screw holes in the blade is reduced, and the strength and tipping resistance of the blade are greatly improved. Therefore, disassembly and assembly are more convenient, and the clamping efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of hardware tools, in particular to a cutting tool. Background Art

[0002] Among the disposable cutting tools replacing ordinary twist drills in the existing market, they are divided into a tool shank and a blade. The blade adopts an existing standard drill tip. Under normal conditions with medium cutting resistance, the cutting is relatively stable and the cutting effect is good. However, in places with poor working conditions and harsh environments, due to the insufficient strength of the blade, the phenomenon of blade breakage may occur, thus affecting production and processing. In view of the above defects, this application is proposed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a cutting tool, which improves the clamping stability, the strength of the blade itself and the resistance to edge chipping, and avoids the problem of blade breakage of traditional disposable cutting tools under poor working conditions.

[0004] To solve the above problems, the utility model provides a cutting tool, which is mainly applicable to drilling work in the mechanical processing industry. It includes a blade, a tool shank and a fixing component. A blade radial positioning surface and a blade axial interference surface are provided on the blade. A blade groove for inserting the blade is provided on the tool shank. A tool shank axial interference surface and a tool shank radial positioning surface are provided in the blade groove. When the blade is installed, the blade axial interference surface and the tool shank axial interference surface are in taper fit, and the difference between the taper angles of the blade axial interference surface and the tool shank axial interference surface > 0, so that a downward force is generated on the blade, and the blade radial positioning surface is in contact with the tool shank radial positioning surface to achieve assembly in place. Then, the blade is fixed by using the fixing component. The fixing method is to provide a fixing component on the tool shank, and the blade is tightly fixed by using the fixing component. There is no need to provide screw holes on the blade, which improves the strength of the blade itself and the resistance to edge chipping, and the clamping stability and clamping efficiency are improved.

[0005] According to an embodiment of the utility model, a positioning groove with one end open is provided on the blade. The blade radial positioning surface and the blade axial interference surface are both formed in the positioning groove. A positioning protrusion is provided on the inner wall of the blade groove. The tool shank axial interference surface and the tool shank radial positioning surface are both formed on the positioning protrusion. When the blade is installed, the positioning protrusion is inserted into the positioning groove.

[0006] According to an embodiment of the utility model, the blade radial positioning surface is formed at the end face of the positioning groove, the blade axial interference surface is formed at the bottom surface of the positioning groove, the tool shank axial interference surface is formed at the bottom surface of the positioning protrusion, and the tool shank radial positioning surface is formed at the end of the positioning protrusion.

[0007] Optionally, a positioning protrusion can be provided on the blade, and a positioning groove can be provided on the inner wall of the blade groove.

[0008] According to an embodiment of the present utility model, a blade bottom reference plane is provided on the blade, and a tool bar bottom reference plane is provided on the tool bar. After the blade is installed, the blade bottom reference plane is attached to the tool bar bottom reference plane.

[0009] According to an embodiment of the present utility model, the depth of the positioning groove < one-third of the blade thickness to ensure the strength of the blade.

[0010] According to an embodiment of the present utility model, the length of the positioning groove is greater than half of the blade width.

[0011] According to an embodiment of the present utility model, the axial interference amount between the blade and the tool bar is 0.03 - 0.2 mm.

[0012] According to an embodiment of the present utility model, the fixing component is a screw, and a tool bar screw hole is provided on the tool bar. The assembled blade is fixed by tightening with the screw.

[0013] According to an embodiment of the present utility model, the tool bar screw hole extends along the insertion direction of the blade.

[0014] According to an embodiment of the present utility model, a notch is provided at the bottom of the blade, and a blade screw clamping surface is formed in the notch for cooperation with the screw to achieve the tightening effect and avoid screw leakage at the same time.

[0015] The beneficial effects of the present utility model are as follows: When installing the blade, the clamping stability is improved by using the interference surface and the positioning surface respectively provided on the blade and the tool bar, and the fixing effect of the blade is achieved by tightening with the fixing component. The design of screw holes on the blade is reduced, greatly improving the strength and chipping resistance of the blade itself. Moreover, only one screw is used for fixing in this solution, making disassembly and assembly more convenient and the clamping efficiency higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 is the main assembly view of the tool of the present invention;

[0018] Figure 2 is Figure 1 the top view;

[0019] Figure 3 is Figure 2 the view A - A in

[0020] Figure 4 is the main view of the blade;

[0021] Figure 5 is the top view of the tool bar;

[0022] Figure 6 For Figure 5 View B-B in the figure;

[0023] Figure 7 For Figure 4 The left view of Specific implementation mode

[0024] The following description is only used to disclose the present utility model so that those skilled in the art can implement the present utility model. The embodiments in the following description are only for example, and those skilled in the art can think of other obvious deformations. The basic principles defined in the following description of the present utility model can be applied to other implementation schemes, deformation schemes, improvement schemes, equivalent schemes and other schemes that do not depart from the spirit and scope of the present utility model.

[0025]

Embodiment 1

[0026] A cutting tool, such as Figure 1 , includes a blade 1, a tool shank 2 and a fixing component.

[0027] Such as Figure 4 , a blade radial positioning surface 12 and a blade axial interference surface 11 are provided on the blade 1. Specifically, a positioning groove with one end open is provided on the blade 1. Both the blade radial positioning surface 12 and the blade axial interference surface 11 are formed in the positioning groove. The blade radial positioning surface 12 is formed on the end face of the positioning groove, and the blade axial interference surface 11 is formed on the bottom surface of the positioning groove. The blade axial interference surface 11 has a conical surface, and the conical surface angle is α.

[0028] Such as Figure 5 , Figure 6 , a blade groove for inserting the blade 1 is provided on the tool shank 2. A tool shank axial interference surface 21 and a tool shank radial positioning surface 22 are provided in the blade groove. Specifically, a positioning protrusion is provided on the inner wall of the blade groove. Both the tool shank axial interference surface 21 and the tool shank radial positioning surface 22 are formed on the positioning protrusion. When the blade is installed, the positioning protrusion is inserted into the positioning groove. The tool shank axial interference surface 21 is formed on the bottom surface of the positioning protrusion, and the tool shank radial positioning surface 22 is formed on the end of the positioning protrusion. The tool shank axial interference surface 21 has a conical surface, and the conical surface angle is β.

[0029] A blade bottom reference surface 13 is provided on the blade 1, and a tool shank bottom reference surface 23 is provided on the tool shank 2.

[0030] The difference between the taper angle of the blade axial interference surface 11 and the taper angle of the tool shank axial interference surface 21 > 0, that is, α - β > 0. Due to the different angles of the blade axial interference surface α and the tool shank axial interference surface β, a downward force is generated, making the blade bottom reference surface 13 and the tool shank bottom reference surface 23 fit firmly. Further, the axial interference amount L between the blade and the tool shank is 0.03 - 0.2 mm.

[0031] Such as Figure 3 , the fixing component is a screw 3. A tool shank screw hole 24 is provided on the tool shank 2. The assembled blade 1 is fixed by tightening with the screw 3. The tool shank screw hole 24 extends along the insertion direction of the blade 1. There is a notch at the bottom of the blade 1, and a blade screw clamping surface 14 is formed in the notch for cooperating with the screw 3 to tighten, while preventing the screw 3 from leaking out.

[0032] In this solution, only one screw design is adopted, making disassembly and assembly more convenient.

[0033] When installing the blade 1, first align the directions of the blade screw clamping surface 14 and the tool shank screw hole 24, then align the blade bottom reference surface 13 and the tool shank bottom reference surface 23. Push the blade 1 into the blade groove. When it reaches the interference surface contact, use the screw 3 to continue pushing until the blade radial positioning surface 12 and the tool shank radial positioning surface 22 are in contact. The assembly is completed, and at this time, the positioning groove and the positioning protrusion achieve an interference fit.

[0034] The blade axial interference surface 11 and the tool shank axial interference surface 21 are in a taper fit. The difference between the taper angle of the blade axial interference surface 11 and the taper angle of the tool shank axial interference surface 21 > 0, generating a downward force on the blade 1. After the blade radial positioning surface 12 contacts the tool shank radial positioning surface 22, the blade is assembled in place at this time.

[0035] The clamping stability is improved through the above-mentioned interference surfaces and positioning surfaces, and the screw hole design is reduced, greatly improving the strength and chipping resistance of the blade itself.

[0036] Preferably, such as Figure 7 , to ensure the strength of the blade, the depth t of the positioning groove < one-third of the blade thickness T, that is, t < 1 / 3 * T.

[0037] Preferably, the length of the positioning groove is greater than half of the width of the blade 1.

[0038] Those skilled in the art should understand that the above description and the embodiments of the present invention shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The function and structural principle of the present invention have been shown and explained in the embodiments. Without departing from the said principle, the embodiments of the present invention can have any deformation and modification.

Claims

1. A cutting tool, characterized in that: It includes a blade (1), a tool shank (2) and a fixing component. A blade radial positioning surface (12) and a blade axial interference surface (11) are provided on the blade (1). A blade groove for inserting the blade (1) is provided on the tool shank (2). A tool shank axial interference surface (21) and a tool shank radial positioning surface (22) are provided in the blade groove. When the blade (1) is installed, the conical surfaces of the blade axial interference surface (11) and the tool shank axial interference surface (21) are in conical surface fit, and the difference between the conical surface angles of the blade axial interference surface (11) and the tool shank axial interference surface (21) > 0, so that a downward force is generated on the blade (1) to make the blade radial positioning surface (12) contact with the tool shank radial positioning surface (22) to achieve assembly in place. The fixing component is installed on the tool shank (2), and the blade (1) is fixed by pressing the blade (1) with the fixing component.

2. The cutting tool according to claim 1, wherein: A positioning groove with one end open is provided on the blade (1). Both the blade radial positioning surface (12) and the blade axial interference surface (11) are formed in the positioning groove. A positioning protrusion is provided on the inner wall of the blade groove. Both the tool shank axial interference surface (21) and the tool shank radial positioning surface (22) are formed on the positioning protrusion. When the blade is installed, the positioning protrusion is inserted into the positioning groove.

3. The tool according to claim 2, characterized in that: The blade radial positioning surface (12) is formed on the end face of the positioning groove, the blade axial interference surface (11) is formed on the bottom surface of the positioning groove, the tool shank axial interference surface (21) is formed on the bottom surface of the positioning protrusion, and the tool shank radial positioning surface (22) is formed on the end of the positioning protrusion.

4. The cutting tool according to claim 3, wherein: A blade bottom reference surface (13) is provided on the blade (1), and a tool shank bottom reference surface (23) is provided on the tool shank (2). After the blade (1) is installed, the blade bottom reference surface (13) is in fit with the tool shank bottom reference surface (23).

5. The cutting tool according to any one of claims 2 to 4, characterized in that: The depth of the positioning groove < one-third of the blade thickness.

6. The cutting tool according to claim 5, wherein: The length of the positioning groove is greater than half of the width of the blade (1).

7. The cutting tool according to claim 5, characterized in that: The axial interference amount between the blade (1) and the tool shank (2) is 0.03 - 0.2 mm.

8. The cutting tool according to claim 6 or 7, characterized in that: The fixing component is a screw (3). A tool shank screw hole (24) is provided on the tool shank (2), and the assembled blade (1) is fixed by pressing with the screw (3).

9. The cutting tool according to claim 8, characterized in that: The tool shank screw hole (24) extends along the insertion direction of the blade (1).

10. The cutting tool according to claim 9, characterized in that: A notch is provided at the bottom of the blade (1), and a blade screw clamping surface (14) is formed in the notch for cooperation with the screw (3) to prevent the screw (3) from leaking out.

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