Cutter with replaceable blade

Abstract

The utility model provides a cutter with a replaceable blade, which relates to the technical field of hole machining cutters and comprises the blade, a cutter bar and a pressing plate. The blade is provided with a cutting edge, side end faces and convex dovetail positioning faces, and the convex dovetail positioning faces are arranged on the side end faces on the two sides. The cutter bar comprises a blade part and a handle part, a blade mounting position is arranged at the end part of the blade part, the blade mounting position comprises a concave dovetail positioning surface and an axial supporting surface, and when the blade is mounted at the blade mounting position, the convex dovetail positioning surface on one side is in contact with the concave dovetail positioning surface. And more stable and reliable processing can be realized through the design of a dovetail positioning surface and a side pressure structure. Due to the centrally symmetrical design of the dovetail face, axial force is centrally stressed, the strength of the cutter bar is improved, it is guaranteed that the blade has good rotation precision after being installed, radial displacement of the blade can be effectively resisted in the drilling process, and it is guaranteed that stable, safe and reliable machining is kept in the high-speed drilling process.

Description

Technical Field

[0001] The utility model relates to the technical field of hole processing tools, in particular to a tool with a replaceable blade. Background Art

[0002] Currently, the commonly used carbide twist drills are all small in size. The large-sized ones are expensive and difficult to process with integral ones. In addition, the welded carbide twist drills are complicated to process and have a short service life. Therefore, for larger deep holes, there is an urgent need for a tool that is simple to clamp and has replaceable blades. Utility Model Content

[0003] The utility model aims to provide a tool with a replaceable blade, which has the advantages of convenient clamping, reliable use and good impact resistance, and solves the problems of short service life and high cost of traditional carbide twist drills.

[0004] In order to solve the above problems, the utility model provides a tool with replaceable blade, including a blade, a tool rod and a pressure plate; the blade is provided with a cutting edge, a side end face, and a convex dovetail positioning surface, and the convex dovetail positioning surface is provided at the side end faces on both sides; the tool rod includes a blade portion and a handle portion, and the end position of the blade portion is provided with a blade mounting position, and the blade mounting position includes a concave dovetail positioning surface and an axial support surface, and when the blade is installed in the blade mounting position, the convex dovetail positioning surface on one side contacts the concave dovetail positioning surface, and the axial support surface contacts the blade; the pressure plate can be connected to the blade mounting position and contact the convex dovetail positioning surface on the other side of the blade to press and fix it.

[0005] According to an embodiment of the present invention, a threaded hole is provided at the blade mounting position, a pressure plate screw hole is provided on the pressure plate, and the pressure plate is connected to the blade mounting position by a fixing screw.

[0006] Optionally, the pressure plate may be fixed by one or several fixing screws.

[0007] According to an embodiment of the present invention, a chip removal guide surface is further provided on the pressure plate, which is conducive to smooth chip removal.

[0008] According to an embodiment of the present invention, the blade is further provided with a chisel edge and a chisel edge chip surface, and the cutting position of the blade has shapes such as a chisel edge, a cutting edge, and an outer circular land, which can make the tool processing range wider.

[0009] Furthermore, a chisel edge avoidance surface is also provided at the blade mounting position.

[0010] According to an embodiment of the present invention, a pressure plate anti-rotation groove is further provided at the blade mounting position, and the pressure plate is at least partially located in the pressure plate anti-rotation groove.

[0011] Furthermore, the threaded hole is arranged in the anti-rotation groove of the pressure plate, the anti-rotation groove of the pressure plate is a long strip groove, and a protrusion that matches the shape of the anti-rotation groove of the pressure plate is arranged at the bottom of the pressure plate.

[0012] According to one embodiment of the present invention, the blade is provided with a primary and secondary chip flute. The primary chip flute utilizes an unequal spiral groove design to effectively enhance the toolholder strength, reduce torsional deformation during drilling, and avoid problems such as blade breakage, poor hole roughness, and poor drilling accuracy caused by toolholder deformation. The secondary chip flute design also facilitates smoother chip removal, reduces chip deformation, and ultimately produces chips of optimal shape.

[0013] According to an embodiment of the present invention, the convex dovetail positioning angle of the convex dovetail positioning surface and the concave dovetail positioning angle of the concave dovetail positioning surface are equal.

[0014] Optionally, the convex dovetail positioning angle and the concave dovetail positioning angle range from 60° to 170°.

[0015] According to an embodiment of the present invention, a cooling channel is provided in the tool rod, and a cooling hole connected to the cooling channel is provided at the end of the blade.

[0016] Optionally, two or more cooling holes are provided.

[0017] According to an embodiment of the present invention, the pressure plate wedge angle of the pressure plate, the convex dovetail wedge angle of the convex dovetail positioning surface, and the concave dovetail wedge angle of the concave dovetail positioning surface are equal.

[0018] Optionally, the angle range of the pressure plate wedge angle, the convex dovetail wedge angle and the concave dovetail wedge angle is 30° to 85°.

[0019] The beneficial effect of this utility model is that the dovetail positioning surface and side pressure structure design can achieve more stable and reliable processing. The centrally symmetrical design of the dovetail surface allows axial force to be applied centrally, improving the strength of the tool bar and ensuring good rotational accuracy of the blade after installation. It can effectively resist radial displacement of the blade during drilling, ensuring stable, safe and reliable processing even during high-speed drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 Schematic diagram of the overall structure of a tool with replaceable blades;

[0022] Figure 2 A partial schematic diagram of a tool with a replaceable blade;

[0023] Figure 3 A schematic diagram of the end structure of a tool with a replaceable blade;

[0024] Figure 4 This is a schematic diagram of the chip groove structure of a tool with replaceable inserts;

[0025] Figure 5 Schematic diagram of the blade structure;

[0026] Figure 6 Schematic diagram of the blade as a whole;

[0027] Figure 7 A schematic diagram of the structure of the installation position of the blade of a tool with replaceable blade;

[0028] Figure 8 Schematic diagram of the cooling channels in a tool with replaceable inserts. DETAILED DESCRIPTION

[0029] The following description is intended only to disclose the present invention and to enable those skilled in the art to implement the present invention. The embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not depart from the spirit and scope of the present invention.

[0030] Example 1:

[0031] A tool with a replaceable blade, such as Figure 1 , including a blade 1, a knife rod 2 and a pressure plate 3.

[0032] like Figure 1 、 Figure 5-Figure 6 The blade 1 is provided with a chisel edge 5, a chisel edge chip surface 9, a cutting edge 10, a side end surface 12, and a convex dovetail positioning surface 13. The convex dovetail positioning surface 13 is provided at the side end surfaces 12 on both sides. The angle range of the convex dovetail positioning angle 14 of the convex dovetail positioning surface 13 is A1:D 60°~170°.

[0033] The convex dovetail positioning surfaces 13 on both sides of the blade can be well positioned on the blade body, and the symmetrical centering design can be used to bear force in the center.

[0034] like Figure 1-Figure 4 The tool bar 2 includes a blade 20 and a handle 30. The end of the blade 20 is provided with a blade mounting position. The blade 20 is provided with a main chip groove 208 and a secondary chip groove 209. Figure 2The blade mounting position includes a concave dovetail positioning surface 217, an axial support surface 202, a rotation stop surface 201, a transverse blade avoidance surface 212 and a pressure plate rotation stop groove 214. The threaded hole 204 is set in the pressure plate rotation stop groove 214. The pressure plate rotation stop groove 214 is a long strip groove. When the blade 1 is installed in the blade mounting position, the convex dovetail positioning surface 13 on one side contacts the concave dovetail positioning surface 217, and the axial support surface 202 contacts and supports the bottom position of the blade 1. The angle of the concave dovetail positioning angle 203 of the concave dovetail positioning surface 217 is equal to the angle of the convex dovetail positioning angle 14, and the angle A2 of the concave dovetail positioning angle 203 is in the range of: 60°~170°.

[0035] The center of the screw hole 204 is at an angle to the blade axis, such as Figure 8 , V3 angle range is 5~30°, which can achieve better fixing effect,

[0036] like Figure 1 、 Figure 7 The pressure plate 3 can be connected to the blade mounting position and contact the convex dovetail positioning surface 13 on the other side of the blade 1 for pressing and fixing. The pressure plate 3 is provided with a pressure plate screw hole 303 and a chip guide surface 302, which is conducive to smooth chip removal. The bottom of the pressure plate 3 is provided with a protrusion that matches the shape of the pressure plate anti-rotation groove 214. The pressure plate 3 is connected to the blade mounting position by a fixing screw 4.

[0037] It is fixed with 1 fixing screw and 4 screws. There is no installation skill required. You only need to put the blade into the blade slot correctly, fit the locking block to the blade through the screw, and fix the blade with the downward pressure generated by the screw. The structure is simple, safe and reliable, and it is very convenient to disassemble and assemble.

[0038] In this solution, the blade adopts a double-sided dovetail groove side pressure structure design, which uses side pressure to position and fix the blade. The clamping is convenient and firm, and the cross-section of the chip groove is enlarged, which prolongs the service life of the tool and reduces the cost.

[0039] The pressure plate wedge angle 301 angle V2 of the pressure plate 3, the convex dovetail wedge angle 101 angle V1 of the convex dovetail positioning surface 13 and the concave dovetail wedge angle 213 angle V4 of the concave dovetail positioning surface 217 are equal, and the angle range is 30°~85°.

[0040] Example 2:

[0041] On the basis of Example 1, Figure 8 A cooling channel 206 is provided in the tool rod 2, and a cooling hole 205 connected to the cooling channel 206 is provided at the end of the blade 20.

[0042] In this embodiment, two cooling holes 205 are provided, such as Figure 1 , cooling holes 205 are respectively arranged on both sides of the blade.

[0043] The tool bar adopts internal cooling hole design to extend tool life and improve chip removal performance.

[0044] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations and modifications may be made to the embodiments of the present invention without departing from the principles described.

Claims

1. A tool with a replaceable blade, characterized in that: The present invention comprises a blade (1), a shank (2) and a pressure plate (3); the blade (1) is provided with a cutting edge (10), a side end surface (12) and a convex dovetail positioning surface (13), and the convex dovetail positioning surface (13) is provided at the side end surfaces (12) on both sides; the shank (2) comprises a blade portion (20) and a shank portion (30), and a blade mounting position is provided at the end position of the blade portion (20), and the blade mounting position comprises a concave dovetail positioning surface (217) and an axial support surface (202), and when the blade (1) is mounted at the blade mounting position, the convex dovetail positioning surface (13) on one side contacts the concave dovetail positioning surface (217), and the axial support surface (202) contacts the blade (1); the pressure plate (3) can be connected to the blade mounting position and contact the convex dovetail positioning surface (13) on the other side of the blade (1) to press and fix it.

2. The tool with replaceable blade according to claim 1, characterized in that: A threaded hole (204) is provided at the blade mounting position, a pressure plate screw hole (303) is provided on the pressure plate (3), and the pressure plate (3) is connected to the blade mounting position via a fixing screw (4).

3. The tool with replaceable blade according to claim 1, characterized in that: A chip removal guide surface (302) is also provided on the pressing plate (3).

4. The tool with replaceable blade according to any one of claims 1 to 3, characterized in that: The blade (1) is also provided with a chisel edge (5) and a chisel edge chip surface (9).

5. The tool with replaceable blade according to claim 4, characterized in that: A transverse edge avoidance surface (212) is also provided at the blade installation position.

6. The tool with replaceable blade according to any one of claims 1 to 3, characterized in that: A pressure plate anti-rotation groove (214) is also provided at the blade mounting position, and the pressure plate (3) is at least partially located in the pressure plate anti-rotation groove (214).

7. The tool with replaceable blade according to claim 6, characterized in that: The blade portion (20) is provided with a main chip removal groove (208) and a secondary chip removal groove (209).

8. The tool with replaceable blade according to claim 1 or 7, characterized in that: The convex dovetail positioning angle (14) of the convex dovetail positioning surface (13) and the concave dovetail positioning angle (203) of the concave dovetail positioning surface (217) are equal in angle, ranging from 60° to 170°.

9. The tool with replaceable blade according to claim 1 or 7, characterized in that: A cooling channel (206) is provided in the shank (2), and a cooling hole (205) connected to the cooling channel (206) is provided at the end of the blade (20).

10. The tool with replaceable blade according to claim 8, characterized in that: The pressing plate wedge angle (301) of the pressing plate (3), the convex dovetail wedge angle (101) of the convex dovetail positioning surface (13), and the concave dovetail wedge angle (213) of the concave dovetail positioning surface (217) are equal in angle and range from 30° to 85°.

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