A countersinking and scraping tool

Abstract

The utility model discloses a countersinking reverse scraping tool, which includes a tool holder and a blade. A connecting hole for connecting a tool rod is provided at the central axis of the tool holder. Two cutting grooves are provided at one axial end of the tool holder. The two cutting grooves are evenly arranged along the circumference of the tool holder. There are two blades, and the blades and the cutting grooves are arranged one by one. Each cutting groove includes a mounting surface for mounting the blade and a chip guide surface for discharging the cut workpiece. The mounting surface is connected to the chip guide surface. The two blades are centrally symmetrical about the central axis of the tool holder. The blade includes an adjacent first end and a second end. The first end of the blade protrudes from one axial end of the tool holder, and the second end of the blade protrudes from the outer peripheral surface of the tool holder. In the utility model, when processing the reverse countersink of the through hole, the two blades are symmetrically arranged, which ensures that the tool and the workpiece are uniformly stressed during cutting, thereby improving the cutting efficiency and cutting accuracy. At the same time, the wear of the blade and the tool holder is reduced, and the service life of the tool is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of countersink processing tools, in particular to a countersink reverse scraping tool. Background Art

[0002] In the processing of countersinking of mechanical parts, a tool bar machine is now mostly used for positioning. After the front end of the guide rod passes through the hole, a reverse scraper is manually installed at the front end of the tool bar to process the countersinking. However, the existing reverse scrapers all have a blade set on one side of the tool holder. Although it can successfully complete the processing of the countersinking, it is prone to uneven cutting after long-term use, and the blade and the tool holder are prone to wear. Utility Model Content

[0003] The main purpose of the utility model is to provide a countersink reverse scraper tool to solve the problems of uneven cutting after long-term use and easy wear of the blade and the tool seat in the existing countersink reverse scraper.

[0004] To solve the above problems, the utility model is achieved as follows:

[0005] A countersinking reverse scraping tool comprises a tool holder and a blade, a connecting hole for connecting a tool rod is provided at the central axis of the tool holder, two cutting grooves are provided at one axial end of the tool holder, and the two cutting grooves are evenly arranged along the circumference of the tool holder. There are two blades, and the blades are arranged in a one-to-one correspondence with the cutting grooves. Each of the cutting grooves comprises a mounting surface for mounting the blade and a chip guide surface for discharging the cut workpiece, and the mounting surface is connected to the chip guide surface. The two blades are centrally symmetrical about the central axis of the tool holder, and the blade comprises adjacent first and second ends. The first end of the blade protrudes from one axial end of the tool holder, and the second end of the blade protrudes from the outer peripheral surface of the tool holder.

[0006] Wherein, the blade is a cemented carbide blade.

[0007] Wherein, the blade is fixedly arranged on the mounting surface of the cutting groove by brazing.

[0008] Among them, a key groove is provided on the hole wall of the connecting hole, the number of the key grooves is two, the axial ends of the key groove are respectively flush with the axial corresponding ends of the connecting hole, and the two key grooves are centrally symmetrical about the central axis of the connecting hole.

[0009] Among them, the tool holder is provided with at least one group of positioning holes along the axial direction, and the number of positioning holes in each group is two. The two positioning holes in the same group are relatively arranged at the radial ends of the tool holder, and the axial direction of the positioning hole is perpendicular to the axial direction of the connecting hole. The positioning hole is a through hole, and one end of the positioning hole passes through the outer peripheral side of the tool holder, and the other end of the positioning hole is connected to the connecting hole.

[0010] Wherein, in the projection of the tool holder on the cross section, the angle between the positioning hole and the keyway ranges from 30° to 45°.

[0011] Wherein, the angle between the positioning hole and the keyway of the connecting hole is 40°.

[0012] Wherein, the outer peripheral surface of the knife seat is a circular surface.

[0013] Wherein, in the projection of the tool holder on the cross section, a surface of the insert away from the mounting surface of the cutting groove is perpendicular to the chip guide surface.

[0014] Among them, the chip guide surface includes a first chip guide surface and a second chip guide surface, one end of the first chip guide surface is flush with the axial corresponding end of the tool seat, and the other end is connected to one end of the second chip guide surface, and the other end of the second chip guide surface extends to the outer peripheral surface of the tool seat; the first chip guide surface is a plane, and the second chip guide surface is an arc surface.

[0015] The beneficial effects of the utility model are:

[0016] When using the utility model, firstly, the front end of the tool bar is passed through the through hole to be processed, and then the tool holder 1 of the utility model is fixedly sleeved on the front end of the tool bar, and the end of the tool holder with the blade installed faces the through hole to be processed. When processing the countersink on the reverse side of the through hole, the two blades are symmetrically arranged, which ensures that the tool and the workpiece are uniformly stressed during cutting, and improves the cutting efficiency and cutting accuracy. At the same time, the wear of the blade and the tool holder is also reduced, and the service life of the tool is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 yes Figure 1 A structural diagram of a perspective;

[0020] Figure 3 yes Figure 1 A structural diagram from another perspective;

[0021] Figure 4 It is a structural schematic diagram of the relative positions of the keyway and the positioning hole;

[0022] Figure 5 yes Figure 1 A stereogram from another perspective.

[0023] Description of Reference Numerals

[0024] 1. Tool holder; 2. Blade; 21. First end; 22. Second end; 3. Connecting hole; 4. Cutting groove; 41. Mounting surface; 421. First chip guide surface; 422. Second chip guide surface; 5. Keyway; 6. Positioning hole. DETAILED DESCRIPTION

[0025] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0026] like Figure 1 As shown, a countersink reverse scraping tool of the utility model includes a tool holder 1 and a blade 2. The tool holder 1 is an axial structure. In this embodiment, the outer peripheral surface of the tool holder 1 is a circular surface. A connecting hole 3 for connecting the tool rod is provided at the central axis of the tool holder 1. Two cutting grooves 4 are provided at one axial end of the tool holder 1. The two cutting grooves 4 are evenly arranged along the circumference of the tool holder 1. There are two blades 2. The blades 2 are arranged one by one with the cutting grooves 4. Each cutting groove 4 includes a mounting surface 41 for mounting the blade 2 and a chip guide surface for discharging the cut workpiece. The mounting surface 41 is connected to the chip guide surface. The two blades 2 are centrally symmetrical about the central axis of the tool holder 1. The blade 2 includes an adjacent first end 21 and a second end 22. The first end 21 of the blade 2 protrudes from one axial end of the tool holder 1, and the second end 22 of the blade 2 protrudes from the outer peripheral surface of the tool holder 1.

[0027] When using the utility model, firstly, the front end of the tool bar is passed through the through hole to be processed, and then the tool holder 1 of the utility model is fixedly sleeved on the front end of the tool bar, and the end of the tool holder 1 with the blade 2 installed faces the through hole to be processed. When processing the countersink on the reverse side of the through hole, the two blades 2 are symmetrically arranged, which ensures that the tool and the workpiece are uniformly stressed during cutting, and improves the cutting efficiency and cutting accuracy. At the same time, it also reduces the wear of the blade and the tool holder, and increases the service life of the tool.

[0028] like Figure 1 , Figure 2 , Figure 3As shown, the blade 2 is a carbide blade. The carbide blade has good wear resistance, high cutting speed, and can be re-grinded many times, which reduces the cost invisibly. The carbide material can be any carbide currently available on the market, such as tungsten-cobalt carbide, tungsten-titanium-tantalum carbide or tungsten-beryllium-cobalt carbide. The blade 2 is fixedly mounted on the mounting surface 41 of the slot 4 by brazing. The connection stability between the blade 2 and the tool holder 1 can be improved, and displacement between the blade and the tool during the cutting process can be avoided, which affects the cutting quality, and at the same time, excessive wear between the blade and the tool during the cutting process can be avoided. In order to further increase the connection strength between the blade 2 and the tool holder, in this embodiment, the mounting surface 41 is a plane, which is parallel to the axial direction of the tool holder 1. A groove for embedding the blade 2 is provided on the mounting surface 41, and the blade 2 is fixedly connected by brazing after being embedded in the groove, which further improves the connection strength. Among them, in the projection of the tool holder 1 on the cross section, the side of the blade 2 away from the mounting surface 41 of the slot 4 is perpendicular to the chip guide surface, so that the tool holder 2 can provide strong support for the blade 2. The second end 22 of the blade 2 is provided with a cutting edge on one side facing the cutting groove 4, and the axial direction of the cutting edge is parallel to the central axis of the blade holder 2. In this embodiment, the cutting edges of the two blades 2 are symmetrical about the central axis of the blade holder 2, which can ensure the cutting quality of the countersunk hole and make the two cutting edges evenly stressed. Figure 5 The first end 21 has an inclined end surface, which is inclined downward in a direction away from the cutting groove 4. During the cutting process, part of the cutting debris can be discharged along the inclined end surface to prevent the debris from accumulating on the blade and damaging the blade. Figure 2 The second end 22 also has a bevel, the side of the bevel away from the blade is closer to the central axis of the blade seat 1 than the side of the bevel located at the blade. This arrangement can also allow some cutting debris to be discharged along the inclined end surface, avoiding the accumulation of debris on the blade and damaging the blade.

[0029] like Figure 1 , Figure 2 , Figure 4As shown, the wall of the connecting hole 3 is provided with a keyway 5, the number of the keyway 5 is two, the axial ends of the keyway 5 are respectively flush with the axial corresponding ends of the connecting hole 3, and the two keyways 5 are centrally symmetrical about the central axis of the connecting hole 3. The tool holder 1 is provided with at least one group of positioning holes 6 along the axial direction, the number of each group of positioning holes 6 is two, and the two positioning holes 6 in the same group are relatively arranged at the radial ends of the tool holder 1, the axial direction of the positioning holes 6 is perpendicular to the axial direction of the connecting hole 3, the positioning holes 6 are through holes, one end of the positioning holes 6 passes through the outer peripheral side of the tool holder 1, and the other end of the positioning holes 6 is connected to the connecting hole 3. The axial direction of the keyway 5 is parallel to the axial direction of the connecting hole 3. Among them, in the projection of the tool holder 1 on the cross section, the angle between the positioning hole 6 and the keyway 5 is between 30° and 45°. In this embodiment, the angle between the positioning hole 6 and the keyway 5 of the connecting hole 3 is 40°. This angle setting can further ensure the connection strength between the tool holder 2 and the tool rod. When installing the tool holder 2, multiple groups of positioning holes can be set, and the axial number of positioning holes 6 can be increased according to different processing depths to achieve multiple positioning dimensions of various tool holders and tool rods, and preliminarily achieve simple and reliable positioning of the tool holder 1 and the tool rod. Then, the tool holder 2 can be further connected to the tool rod through the keyway 5 and the key to strengthen the connection strength. The symmetrical keys transmit torque, the force is stable and the torque is large, which reduces the wear and deformation of the tool holder.

[0030] In this embodiment, the chip guide surface includes a first chip guide surface 421 and a second chip guide surface 422. One end of the first chip guide surface 421 is flush with the axial corresponding end of the tool holder 1, and the other end is connected to one end of the second chip guide surface 422. The other end of the second chip guide surface 422 extends to the outer peripheral surface of the tool holder 1. The first chip guide surface 421 is a plane, and the second chip guide surface 422 is an arc surface. The end of the second chip guide surface 422 connected to the first chip guide surface 421 is closer to the first end 21 of the blade 2 than the end of the second chip guide surface 422 connected to the outer peripheral surface of the tool holder 1. The setting of the first chip guide surface 421 provides sufficient installation space for the blade 1, and at the same time can ensure that most of the cutting chips are discharged smoothly along the first chip guide surface 421 and the second chip guide surface 422 in sequence, avoiding the accumulation of cutting chips at the cutting point between the blade and the workpiece, thereby extending the service life of the tool. In this embodiment, the portion of the blade 2 located in the cutting groove 4 is provided with an arc surface to prevent cutting debris from accumulating at the junction of the blade and the mounting surface 41 .

[0031] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

Claims

1. A countersinking reverse scraping tool, characterized in that: It includes a tool holder and a blade. A connecting hole for connecting a tool rod is provided at the central axis of the tool holder. Two cutting grooves are provided at one axial end of the tool holder. The two cutting grooves are evenly arranged along the circumference of the tool holder. There are two blades. The blades are arranged in a one-to-one correspondence with the cutting grooves. Each of the cutting grooves includes a mounting surface for mounting the blade and a chip guide surface for discharging the cut workpiece. The mounting surface is connected to the chip guide surface. The two blades are centrally symmetrical about the central axis of the tool holder. The blade includes an adjacent first end and a second end. The first end of the blade protrudes from one axial end of the tool holder, and the second end of the blade protrudes from the outer peripheral surface of the tool holder.

2. The countersink reverse scraper tool according to claim 1, characterized in that: The blade is a cemented carbide blade.

3. The countersink reverse scraper tool according to claim 1, characterized in that: The blade is fixedly arranged on the mounting surface of the cutting groove by brazing.

4. The countersink reverse scraper tool according to claim 1, characterized in that: A keyway is provided on the hole wall of the connecting hole. There are two keyways. Both axial ends of the keyway are flush with the corresponding axial ends of the connecting hole respectively. The two keyways are centrally symmetrical about the central axis of the connecting hole.

5. The countersink reverse scraper tool according to claim 1, characterized in that: The tool holder is provided with at least one group of positioning holes along the axial direction, each group of positioning holes has two positioning holes, the two positioning holes in the same group are relatively arranged at the radial ends of the tool holder, the axial direction of the positioning hole is perpendicular to the axial direction of the connecting hole, the positioning hole is a through hole, one end of the positioning hole passes through the outer peripheral side of the tool holder, and the other end of the positioning hole is connected to the connecting hole.

6. The countersink reverse scraper tool according to claim 4, characterized in that: The tool holder is provided with at least one group of positioning holes along the axial direction, each group of positioning holes has two positioning holes, the two positioning holes in the same group are relatively arranged at the radial ends of the tool holder, the axial direction of the positioning hole is perpendicular to the axial direction of the connecting hole, the positioning hole is a through hole, one end of the positioning hole passes through the outer peripheral side of the tool holder, and the other end of the positioning hole is connected to the connecting hole.

7. The countersink reverse scraper tool according to claim 6, characterized in that: In the projection of the tool holder on the cross section, the angle between the positioning hole and the keyway is in the range of 30°-45°.

8. The countersink reverse scraper tool according to claim 7, characterized in that: The angle between the positioning hole and the keyway of the connecting hole is 40°.

9. The countersink reverse scraper tool according to claim 1, characterized in that: The outer peripheral surface of the knife seat is a circular surface.

10. The countersink reverse scraper tool according to claim 1, characterized in that: In the projection of the tool seat on the cross section, a surface of the insert away from the mounting surface of the cutting groove is perpendicular to the chip guide surface.

11. A countersink reverse scraper according to claim 1 or 10, characterized in that: The chip guide surface includes a first chip guide surface and a second chip guide surface. One end of the first chip guide surface is flush with the axial corresponding end of the tool seat, and the other end is connected to one end of the second chip guide surface. The other end of the second chip guide surface extends to the outer peripheral surface of the tool seat. The first chip guide surface is a plane, and the second chip guide surface is an arc surface.

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