Disposable cutting drill bit for numerical control deep hole machining

Abstract

The utility model discloses a disposable cutting drill bit for numerical control deep hole machining, which comprises a tool handle, a tool body and a cutting tool bit, the cutting tool bit is detachably mounted at the front end of the tool body, and the cutting tool bit comprises a front edge, a first rear edge, a second rear edge, a first chip groove and a second chip groove. The front edge comprises a cutting front angle, a first cutting rear angle and a second cutting rear angle, the cutting front angle and the first cutting rear angle are connected to form a first cutting knife, the cutting front angle and the second cutting rear angle are connected to form a second cutting knife, and the first cutting knife and the second cutting knife are the same in size and are symmetrically arranged with the cutting front angle as the boundary; a first chip groove is formed in the inner side face of the first cutter, a second chip groove is formed in the outer side face of the second cutter, a first rear edge is arranged on the upper edge of the first chip groove, and a second rear edge is arranged on the upper edge of the second chip groove. The drill bit is simple in structure, high in scrap discharging efficiency and high in machining efficiency, the drill bit is not prone to damage, the cutting tool bit is fast and convenient to replace, and a good practical effect is achieved.

Description

Technical Field

[0001] The utility model relates to a metal cutting tool for mechanical processing, in particular to a discarded cutting drill bit for numerical control deep hole processing. Background Art

[0002] A deep hole drill is a drill specially used for processing deep holes. A carbide deep hole drill is an effective deep hole processing tool with a wide processing range. Existing deep hole drills are generally welded to drill rods. When drilling deep holes, only the feed rate of the drill can be controlled, that is, the drill is withdrawn from the workpiece to remove chips after drilling a certain distance. The deeper the hole, the greater the friction resistance between the tool rod and the hole wall, and the adhered waste chips are not easy to break. This type of deep hole drill has difficulty in chip removal during processing, has low processing efficiency, is easily damaged, and has a single processing function, which cannot meet the processing needs of various parts. The entire drill needs to be replaced after the tool head is worn or reaches its service life. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a disposable cutting drill bit for CNC deep hole machining which not only has high waste chip discharge efficiency and high machining efficiency during machining, but also ensures that the drill bit is not easily damaged, and the cutting bit can be replaced when machining different types of parts and when the cutting bit is worn or reaches the end of its service life.

[0004] In order to solve the above technical problems, the utility model adopts such a discarded cutting drill for CNC deep hole processing, comprising a shank, a cutter body and a cutting bit arranged at the front end of the cutter body, the cutting bit, the cutter body and the shank are arranged in sequence in a straight line, the shank and the cutter body are made in one piece, the cutting bit can be detachably mounted on the front end of the cutter body, the cutting bit comprises a front edge, a first rear edge, a second rear edge, a first chip groove and a second chip groove, the front edge comprises a cutting front angle, a first cutting back angle and a second cutting back angle, the cutting front angle is arranged at the center of the front end of the cutting bit, the first cutting The back angle and the second cutting back angle are symmetrically arranged on the two outer edges of the cutting head away from the cutting front angle and lower than the cutting front angle, the cutting front angle and the first cutting back angle are connected to form a first cutting tool, the cutting front angle and the second cutting back angle are connected to form a second cutting tool, the first cutting tool and the second cutting tool are the same size and are symmetrically arranged with the cutting front angle as the boundary, a first chip groove is arranged on the inner side surface of the first cutting tool, a second chip groove is arranged on the outer side surface of the second cutting tool, a first back edge is arranged on the upper edge of the first chip groove, and a second back edge is arranged on the upper edge of the second chip groove.

[0005] As a preferred embodiment of the utility model, a threaded fixing hole is opened in the center of the bottom of the cutting bit, and a through hole is opened in the center of the shank and the knife body axis. The through hole penetrates the shank and the knife body and matches the fixing hole. The cutting bit is installed on the knife body by screwing a fastening screw from the through hole into the fixing hole.

[0006] As a preferred embodiment of the utility model, two tool body chip grooves which are parallel to each other and are spiral are arranged on the tool body, and the front parts of the two tool body chip grooves are arranged corresponding to the rear parts of the first chip groove and the second chip groove respectively.

[0007] As a preferred embodiment of the present invention, a third chip groove is arranged on the upper part of the first chip groove and on the inner side of the upper part of the first cutting blade and the inner end of the upper part of the second cutting blade, and the third chip groove is in the shape of an inclined circular arc. A fourth chip groove is arranged on the upper part of the second chip groove and on the outer side of the upper part of the second cutting blade and the inner end of the upper part of the first cutting blade, and the fourth chip groove is in the shape of an inclined circular arc. The upper and lower edges of the third chip groove are respectively set to the third rear edge cutting front angle and the third rear edge cutting back angle, and the upper and lower edges of the fourth chip groove are respectively set to the fourth rear edge cutting front angle and the fourth rear edge cutting back angle.

[0008] As a preferred embodiment of the utility model, a positioning shoulder is provided at the connection between the front end of the handle and the rear end of the knife body.

[0009] After adopting the above structure, the utility model has the following beneficial effects:

[0010] The utility model discloses a discard-type cutting drill for CNC deep hole processing, comprising a shank, a cutter body and a cutting bit arranged at the front end of the cutter body, wherein the cutting bit, the cutter body and the shank are arranged in sequence in a straight line, the shank and the cutter body are made in one piece, the cutting bit can be detachably mounted at the front end of the cutter body, the cutting bit comprises a front edge, a first rear edge, a second rear edge, a first chip removal groove and a second chip removal groove, the front edge comprises a cutting front angle, a first cutting back angle and a second cutting back angle, the cutting front angle is arranged at the center of the front end of the cutting bit, the first cutting back angle and the second cutting back angle The corners are symmetrically arranged on the two outer edges of the cutting head away from the cutting front angle and lower than the cutting front angle, the cutting front angle and the first cutting back angle are connected to form a first cutting tool, the cutting front angle and the second cutting back angle are connected to form a second cutting tool, the first cutting tool and the second cutting tool are the same size and are symmetrically arranged with the cutting front angle as the boundary, a first chip groove is arranged on the inner side surface of the first cutting tool, a second chip groove is arranged on the outer side surface of the second cutting tool, a first rear edge is arranged on the upper edge of the first chip groove, and a second rear edge is arranged on the upper edge of the second chip groove. The utility model adopts a split structure on the one hand, so that the tool body and the cutting head can be detached and disassembled. When the cutting head is worn or reaches the end of its service life, only the cutting head needs to be replaced, which reduces the use cost, saves replacement time, and is convenient for operation and maintenance. The utility model can also conveniently replace cutting heads with different functions according to the processing requirements of parts, reduces the number of times parts are disassembled and assembled, and improves the processing efficiency and processing accuracy of parts. On the other hand, the cutting head of the utility model adopts a front and rear edge structure, the front edge is used for drilling, and the rear edge is used for scraping away waste chips adhered to the hole wall during processing, reducing the wear and chipping of the cutting head. The scraping of waste chips by the rear edge, coupled with the use of the first chip removal groove and the second chip removal groove structure, can also improve the waste chip discharge efficiency and improve the smoothness of the hole wall.

[0011] The bottom center of the cutting head of the utility model is provided with a threaded fixing hole, the center of the handle and the cutter body axis is provided with a through hole, the through hole penetrates the handle and the cutter body and matches the fixing hole, and the cutting head is installed on the cutter body by screwing a fastening screw from the through hole into the fixing hole. Such a structure allows the cutter body and the cutting head to be quickly disassembled and separated, and facilitates the replacement of the cutting head.

[0012] The utility model provides two tool body chip removal grooves which are parallel and spiral in shape, and the front parts of the two tool body chip removal grooves are respectively arranged corresponding to the rear parts of the first chip removal groove and the second chip removal groove. In this way, waste chips can be better discharged through the tool body chip removal grooves during deep hole drilling.

[0013] The utility model provides a third chip groove on the upper part of the first chip groove and on the inner side of the upper part of the first cutting tool and the inner end of the upper part of the second cutting tool, the third chip groove is in the shape of an inclined arc, the second chip groove is provided on the upper part of the second cutting tool and on the outer side of the upper part of the second cutting tool and the inner end of the upper part of the first cutting tool, the fourth chip groove is in the shape of an inclined arc, the upper and lower edges of the third chip groove are respectively provided as the third rear edge cutting front angle and the third rear edge cutting back angle, the upper and lower edges of the fourth chip groove are respectively provided as the fourth rear edge cutting front angle and the fourth rear edge cutting back angle. The utility model can better scrape away waste chips adhering to the hole wall during processing and facilitate chip removal by providing the third chip groove, the fourth chip groove, the third rear edge cutting front angle, the third rear edge cutting back angle, the fourth rear edge cutting front angle and the fourth rear edge cutting back angle.

[0014] The connection between the front end of the handle and the rear end of the body is provided with a positioning shoulder, and such a structure can position the drilling depth of the cutting drill bit during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0016] Figure 1 The utility model is a schematic structural diagram of a discarded cutting drill bit for CNC deep hole processing.

[0017] Figure 2 for Figure 1 Schematic diagram of the structure of the cutting head.

[0018] Figure 3 It is a three-dimensional schematic diagram of the bottom structure of the cutting head of the utility model.

[0019] Figure 4 It is a three-dimensional schematic diagram of the structure of the cutting head of the utility model from another perspective. DETAILED DESCRIPTION

[0020] See also Figure 1 , Figure 2 , Figure 3 , Figure 4A discard-type cutting drill for CNC deep hole processing shown in the figure comprises a shank 1, a cutter body 2 and a cutting bit 3 arranged at the front end of the cutter body, the cutting bit 3, the cutter body 2 and the shank 1 are arranged in sequence in the same straight line, the shank 1 and the cutter body 2 are made as one piece, the cutting bit 3 is detachably mounted at the front end of the cutter body 2, the cutting bit 3 comprises a front edge 4, a first rear edge 5, a second rear edge 6, a first chip groove 7 and a second chip groove 8, the front edge 4 comprises a cutting front angle 4-1, a first cutting back angle 4-2 and a second cutting back angle 4-3, the cutting front angle 4-1 is arranged at the center of the front end of the cutting bit 3, the first cutting back angle 4-2 and the second cutting back angle 4-3 are arranged at the front end of the cutting bit 3, and the first cutting back angle 4-2 and the second cutting back angle 4-3 are arranged at the front end of the cutting bit 3. 3 are symmetrically arranged on the two outer edges of the cutting tool head 3 away from the cutting front angle 4-1 and lower than the cutting front angle 4-1, the cutting front angle 4-1 and the first cutting back angle 4-2 are connected to form a first cutting tool 9, the cutting front angle 4-1 and the second cutting back angle 4-3 are connected to form a second cutting tool 10, the first cutting tool 9 and the second cutting tool 10 are of the same size and are symmetrically arranged with the cutting front angle 4-1 as the boundary, a first chip groove 7 is arranged on the inner side surface of the first cutting tool 9, a second chip groove 8 is arranged on the outer side surface of the second cutting tool 10, a first rear edge 5 is arranged on the upper edge of the first chip groove 7, and a second rear edge 6 is arranged on the upper edge of the second chip groove 8.

[0021] As a preferred embodiment of the present invention, Figure 1 , 3 As shown, a threaded fixing hole 11 is opened at the center of the bottom of the cutting head 3, and a through hole 12 is opened at the center of the axis of the tool handle 1 and the tool body 2. The through hole 12 passes through the tool handle 1 and the tool body 2 and matches the fixing hole 11. The cutting head 3 is installed on the tool body 2 by screwing a fastening screw from the through hole 12 into the fixing hole 11.

[0022] As a preferred embodiment of the present invention, Figure 1 As shown, two tool body chip removal grooves 13 which are parallel to each other and are spiral are arranged on the tool body 2, and the front parts of the two tool body chip removal grooves 13 are arranged corresponding to the rear parts of the first chip removal groove 7 and the second chip removal groove 8 respectively.

[0023] As a preferred embodiment of the present invention, Figure 2 , 4As shown, a third chip groove 14 is arranged on the upper part of the first chip groove 7 and on the inner side of the upper part of the first cutting blade 9 and the inner end of the upper part of the second cutting blade 10, and the third chip groove 14 is in the shape of an inclined circular arc. A fourth chip groove 15 is arranged on the upper part of the second chip groove 8 and on the outer side of the upper part of the second cutting blade 10 and the inner end of the upper part of the first cutting blade 9, and the fourth chip groove 15 is in the shape of an inclined circular arc. The upper and lower edges of the third chip groove 14 are respectively arranged as a third rear edge cutting front angle 16 and a third rear edge cutting back angle 17, and the upper and lower edges of the fourth chip groove 15 are respectively arranged as a fourth rear edge cutting front angle 18 and a fourth rear edge cutting back angle 19.

[0024] As a preferred embodiment of the present invention, Figure 1 As shown, a positioning shoulder 20 is provided at the connection between the front end of the handle 1 and the rear end of the blade body 2.

[0025] When the utility model is working, the cutting front angle 4-1, the first cutting back angle 4-2 and the second cutting back angle 4-3 of the front edge 4 of the cutting head 3 are used for cutting and drilling, and the first back edge 5 and the second back edge 6 are used to scrape off the waste chips adhered to the hole wall during processing. The waste chips are discharged from the workpiece by the first chip groove 7 and the second chip groove 8 respectively through the two tool body chip grooves 13.

[0026] After trial, the utility model has been found to have a simple structure. It not only has a high waste chip discharge efficiency, which greatly improves the processing efficiency while ensuring that the drill bit is not easily damaged, but also is quick and convenient to replace the cutting head, saving the time for replacing the cutting head and reducing the cost of use. It is also very convenient to operate and maintain, and has achieved good practical results.

Claims

1. A discard-type cutting drill for CNC deep hole machining, comprising a shank (1), a cutter body (2) and a cutting head (3) arranged at the front end of the cutter body, wherein the cutting head (3), the cutter body (2) and the shank (1) are arranged in sequence in a straight line, and the shank (1) and the cutter body (2) are made in one piece, characterized in that: The cutting head (3) is detachably mounted on the front end of the tool body (2); the cutting head (3) comprises a front edge (4), a first rear edge (5), a second rear edge (6), a first chip removal groove (7) and a second chip removal groove (8); the front edge (4) comprises a cutting front angle (4-1), a first cutting back angle (4-2) and a second cutting back angle (4-3); the cutting front angle (4-1) is arranged at the center of the front end of the cutting head (3); the first cutting back angle (4-2) and the second cutting back angle (4-3) are symmetrically arranged at the cutting head (3) away from the cutting front angle (4-1) and lower than the cutting front angle (4-1). ), the cutting front angle (4-1) and the first cutting back angle (4-2) are connected to form a first cutting tool (9), the cutting front angle (4-1) and the second cutting back angle (4-3) are connected to form a second cutting tool (10), the first cutting tool (9) and the second cutting tool (10) are of the same size and are symmetrically arranged with the cutting front angle (4-1) as the boundary, a first chip groove (7) is arranged on the inner side surface of the first cutting tool (9), a second chip groove (8) is arranged on the outer side surface of the second cutting tool (10), a first rear edge (5) is arranged on the upper edge of the first chip groove (7), and a second rear edge (6) is arranged on the upper edge of the second chip groove (8).

2. The discard cutting drill bit for CNC deep hole machining according to claim 1, characterized in that: A threaded fixing hole (11) is formed at the center of the bottom of the cutting head (3); a through hole (12) is formed at the center of the shaft of the tool handle (1) and the tool body (2); the through hole (12) penetrates the tool handle (1) and the tool body (2) and matches the fixing hole (11); the cutting head (3) is mounted on the tool body (2) by screwing a fastening screw from the through hole (12) into the fixing hole (11).

3. The discard cutting drill bit for CNC deep hole machining according to claim 1, characterized in that: The tool body (2) is provided with two tool body chip removal grooves (13) which are parallel to each other and are in a spiral shape, and the front parts of the two tool body chip removal grooves (13) are respectively arranged corresponding to the rear parts of the first chip removal groove (7) and the second chip removal groove (8).

4. The discard cutting drill bit for CNC deep hole machining according to claim 1, characterized in that: A third chip groove (14) is provided on the upper part of the first chip groove (7) and on the inner side of the upper part of the first cutting blade (9) and on the inner end of the upper part of the second cutting blade (10), and the third chip groove (14) is in the shape of an inclined circular arc. A fourth chip groove (15) is provided on the upper part of the second chip groove (8) and on the outer side of the upper part of the second cutting blade (10) and on the inner end of the upper part of the first cutting blade (9), and the fourth chip groove (15) is in the shape of an inclined circular arc. The upper and lower edges of the third chip groove (14) are respectively provided as a third rear edge cutting front angle (16) and a third rear edge cutting clearance angle (17), and the upper and lower edges of the fourth chip groove (15) are respectively provided as a fourth rear edge cutting front angle (18) and a fourth rear edge cutting clearance angle (19).

5. The discard cutting drill bit for CNC deep hole machining according to claim 1, characterized in that: A positioning shoulder (20) is provided at the connection between the front end of the knife handle (1) and the rear end of the knife body (2).

Images