A raw material cutting device for drill bit production

Abstract

The present application relates to drill bit processing technical field, specifically to a kind of raw material cutting device for drill bit production, including frame, the top of frame is equipped with lifting mechanism, the output end of lifting mechanism is equipped with disc cutter for cutting drill bit, the side of frame away from lifting mechanism is equipped with measuring mechanism for adjusting the length of drill bit, the side of measuring mechanism close to lifting mechanism is equipped with clamping mechanism for clamping drill bit, the side of measuring mechanism away from clamping mechanism is equipped with lubricating mechanism;Through fixed block drive contact plate sliding, further make straight rack slide in limiting groove, realize the cooperation of oil pipe and oil bag and take oil, use reset spring to realize automatic reset and stop taking oil, realize the automatic accurate lubrication of measuring mechanism, without manual addition of lubricant, reduce the labor intensity, avoid the lubrication deficiency or excess problem brought by artificial operation simultaneously, guarantee the stability of measuring mechanism operation, prolong the service life of equipment.

Description

Technical Field

[0001] This invention relates to the field of drill bit processing technology, and more specifically to a raw material cutting device for drill bit production. Background Technology

[0002] Drill bits are tools used to drill holes in metal workpieces. They are usually made of high-speed steel or cemented carbide and have specific geometries and sharp cutting edges. In the drill bit production process, raw material cutting is an important preliminary step.

[0003] A search revealed Chinese invention patent CN107891175B, which discloses a cutting device for producing electric hammer drill bits. This device uses a clamping mechanism to hold the drill bit components, preventing misalignment during cutting and improving cutting accuracy. By placing the drill bit components in the slot of the chuck, a second telescopic cylinder moves the chuck downwards, causing the two chuck rods to rotate in the same direction, thus pressing the drill bit components firmly and preventing them from loosening. This solves the problem of insecure clamping in existing electric hammer drill bit manufacturing processes.

[0004] However, in actual use, the connecting plate reciprocates along the first slide rod under the push and pull of the first cylinder. During the reciprocating motion, friction will occur continuously, which will easily lead to gradual wear of the surface metal, increasing the fit gap between the connecting plate and the first slide rod, and causing a decrease in the stability of the connecting plate's movement. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a raw material cutting device for drill bit production, which can effectively solve the problem that the connecting plate will continuously rub during the reciprocating motion, which will easily lead to the gradual wear of the surface metal, increase the fit clearance between the connecting plate and the first slide rod, and reduce the stability of the connecting plate's movement.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a raw material cutting device for drill bit production, including a frame, a lifting mechanism above the frame, a disc cutter for cutting drill bits at the output end of the lifting mechanism, a measuring mechanism for adjusting the length of the drill bit on the side of the frame away from the lifting mechanism, a clamping mechanism for holding the drill bit on the side of the measuring mechanism close to the lifting mechanism, a lubrication mechanism on the side of the measuring mechanism away from the clamping mechanism, and a fixing block for driving the lubrication mechanism to output oil on the other side of the measuring mechanism. The lubrication mechanism includes a contact plate that contacts the fixed block during use. A connecting plate is provided on the inner side of the contact plate. A sliding plate is provided at the end of the connecting plate away from the contact plate. A guide rail is provided on the side surface of the connecting plate near the lifting mechanism. The guide rail is inclined and forms an acute angle with the horizontal plane. A rack is provided on the side surface of the connecting plate near the lifting mechanism. A mating groove that cooperates with the guide rail is opened on the side surface of the rack near the connecting plate. An oil extraction pipe is provided through the rack. An oil reservoir is provided above the oil extraction pipe. The oil extraction pipe is connected to an outlet hole. The end of the outlet hole is connected to a measuring mechanism.

[0007] Furthermore, the contact plate is arc-shaped, and the end of the fixing block near the lubrication mechanism is provided with a protrusion for driving the contact plate to slide secondary.

[0008] Furthermore, a slot is provided on the side of the frame away from the lifting mechanism, and the sliding plate is slidably installed inside the slot, with the size of the sliding plate perfectly matching the size of the slot. A return spring is provided at the end of the sliding plate away from the contact plate to reset the lubrication mechanism.

[0009] Furthermore, the frame has a limiting groove inside for sliding of the rack, the bottom of the limiting groove is in the shape of an inverted frustum, and the frame has an air blowing mechanism on the side near the lubrication mechanism.

[0010] Furthermore, the air blowing mechanism includes a spur gear meshing with a rack and pinion, the spur gear being fixedly connected to a connecting shaft, the end of the connecting shaft being provided with a bevel gear set, the top of the bevel gear set being rotatably mounted with a first connecting rod, the end of the first connecting rod being rotatably mounted with a second connecting rod, the end of the second connecting rod being rotatably mounted on a drive rod, the output end of the drive rod being provided with an air blowing cylinder, the air blowing cylinder being fixedly mounted on a measuring plate, and the measuring plate being fixedly mounted on a frame.

[0011] Furthermore, the measuring mechanism includes a drive motor mounted on the side wall of the frame, the output end of the drive motor is provided with a one-way lead screw, the one-way lead screw is threadedly connected to a sliding frame, a fixing block is fixedly installed at the end of the sliding frame away from the lifting mechanism, and a clamping mechanism is fixedly installed at the end of the sliding frame close to the lifting mechanism.

[0012] Furthermore, the sliding frame is M-shaped, and a set of legs of the sliding frame away from the unidirectional lead screw is slidably connected to a guide rod. The upper surface of the frame is symmetrically provided with measuring grooves for the sliding of the two sets of legs of the sliding frame.

[0013] Furthermore, the lifting mechanism includes a lifting motor at the top of the fixed frame, a reciprocating lead screw on the output shaft of the lifting motor, a lifting block for supporting the disc cutter connected to the reciprocating lead screw, and a lifting groove for the lifting block to slide on the surface of the frame.

[0014] Furthermore, the lifting block is fixedly connected to a lifting rack, the lifting rack is engaged with a centering mechanism for centering the drill bit, and the lifting groove is provided with a sliding groove for the lifting rack to slide.

[0015] Furthermore, the frame surface has a cutting groove for the drill bit to pass through, and the cutting groove is connected to the sliding groove.

[0016] Beneficial effects The technical solution provided by this invention has the following advantages compared with the known prior art: 1. By driving the contact plate to slide through the fixed block, the rack slides within the limiting groove, enabling the oil pipe and oil tank to work together to extract oil. The return spring automatically resets and stops oil extraction, achieving automatic and precise lubrication of the measuring mechanism. This eliminates the need for manual lubrication, reducing labor intensity and avoiding insufficient or excessive lubrication caused by manual operation. It ensures the stability of the measuring mechanism's operation and extends the equipment's service life. Second, the up-and-down movement of the rack drives a series of components such as spur gears, connecting shafts, and bevel gear sets to achieve the air-blowing action of the air blower. This allows the blown air to diffuse along the inner wall of the measuring plate, effectively cleaning debris from the inner wall of the measuring plate and the cutting groove. At the same time, the cutting groove provides a clear cutting channel for the drill bit, reducing debris and sparks from splashing. It is also connected to the sliding groove and its bottom is open to the outside, facilitating the collection and cleaning of cutting debris below the frame, thus improving the efficiency of the cutting operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention; Figure 2 This is a schematic diagram of the normal operating state of the device of the present invention; Figure 3 This is a schematic diagram of the lifting mechanism structure of the present invention; Figure 4 This is a partial cross-sectional view of the framework of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 For the present invention Figure 4 Enlarged view of point B in the middle; Figure 7 This is an exploded view of the lubrication mechanism of the present invention.

[0019] Reference numerals: 1. Frame; 101. Slot; 102. Lifting slot; 103. Sliding slot; 104. Cutting slot; 105. Measuring plate; 106. Measuring slot; 2. Lifting mechanism; 201. Lifting motor; 202. Reciprocating lead screw; 203. Lifting block; 204. Circular cutting machine; 205. Lifting rack; 3. Measuring mechanism; 301. Drive motor; 302. One-way lead screw; 303. Sliding frame; 304. Fixing block; 305. Guide rod; 4. Lubrication mechanism; 40 1. Contact plate; 402. Connecting plate; 403. Guide rail; 404. Spur rack; 405. Mating groove; 406. Oil pipe; 407. Sliding plate; 408. Return spring; 409. Limiting groove; 410. Outlet hole; 412. Oil tank; 5. Air blowing mechanism; 501. Spur gear; 502. Connecting shaft; 503. Bevel gear set; 504. First connecting rod; 505. Second connecting rod; 506. Drive rod; 507. Air blower; 6. Centering mechanism; 7. Clamping mechanism. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments.

[0022] A raw material cutting device for drill bit production, as shown in the attached document. Figure 1-7 The system includes a frame 1, a lifting mechanism 2 on top of the frame 1, a disc cutter 204 for cutting drill bits at the output end of the lifting mechanism 2, a measuring mechanism 3 for adjusting the length of the drill bit on the side of the frame 1 away from the lifting mechanism 2, a clamping mechanism 7 for clamping the drill bit on the side of the measuring mechanism 3 close to the lifting mechanism 2, a lubrication mechanism 4 on the side of the measuring mechanism 3 away from the clamping mechanism 7, and a fixing block 304 for driving the lubrication mechanism 4 to output oil on the other side of the measuring mechanism 3. The lubrication mechanism 4 includes a contact plate 401 that contacts the fixing block 304 during use. The contact plate 401 is arc-shaped. One end of the fixing block 304 near the lubrication mechanism 4 has a protrusion for driving the contact plate 401 to slide secondary. When the fixing block 304 contacts the contact plate 401, it pushes the contact plate 401 to slide stably along the slot 101. When the protrusion contacts the contact plate 401, the contact plate 401 continues to slide. The protrusion increases the sliding stroke of the contact plate 401. A connecting plate 402 is provided on the inner side of the contact plate 401. The connecting plate 402 is located away from the contact plate 401. A sliding plate 407 is provided at one end. A slot 101 is provided on the surface of the frame 1 away from the lifting mechanism 2. The sliding plate 407 is slidably installed inside the slot 101, and the size of the sliding plate 407 perfectly matches the size of the slot 101. A return spring 408 is provided at the end of the sliding plate 407 away from the contact plate 401 for resetting the lubrication mechanism 4. The sliding plate 407 compresses the return spring 408, and the return spring 408 is compressed to store the reset force of the contact plate 401. Specifically, when the fixing block 304 moves away from the slot 101 and loses contact with the contact plate 401, the return spring 408... 08. The deformation is restored, and the contact plate 401 returns to its original position. A guide rail 403 is provided on the side surface of the connecting plate 402 near the lifting mechanism 2. The guide rail 403 is inclined and forms an acute angle with the horizontal plane. A rack 404 is provided on the side surface of the connecting plate 402 near the lifting mechanism 2. A mating groove 405 that cooperates with the guide rail 403 is opened on the side surface of the rack 404 near the connecting plate 402. An oil extraction pipe 406 is inserted through the rack 404. An oil tank 412 is provided above the oil extraction pipe 406. The oil extraction pipe 406 is connected to an outlet hole 410, from which oil flows out. The end of the hole 410 is connected to the measuring mechanism 3. The frame 1 has a limiting groove 409 for sliding the rack 404. The bottom of the limiting groove 409 is in the shape of an inverted truncated pyramid. The frame 1 has an air blowing mechanism 5 on the side near the lubrication mechanism 4. The limiting groove 409 limits the rack 404 to ensure the stability of the rack 404. The shape of the limiting groove 409 can prevent the dripping lubricant from accumulating inside the limiting groove 409. Specifically, due to the effect of gravity, the lubricant will flow naturally along these inclined surfaces to the edge of the limiting groove 409 and finally be discharged from the limiting groove 409.

[0023] In the above technical solution, when the measuring mechanism 3 needs to be lubricated, the position of the fixed block 304 is moved and inserted into the slot 101. The fixed block 304 pushes the contact plate 401 to slide along the inner extension direction of the slot 101. During this process, the return spring 408 is pushed by 407, causing the return spring 408 to be compressed and deformed. At the same time, with the cooperation of the guide rail 403 and the mating groove 405, the rack 404 moves vertically upward along the limiting groove 409. The rack 404 drives the oil pipe 406 to move upward and insert into the oil bag 412 to realize the oil taking action. When the fixed block 304 moves away from the slot 101, the return spring 408 drives 401 back to its original position. At this time, the oil pipe 406 returns to its original position, stopping the oil taking action, reducing labor intensity, and avoiding insufficient or excessive lubrication caused by human operation error.

[0024] Furthermore, a limiting groove 409 is provided inside the frame 1 for the rack 404 to slide. The bottom of the limiting groove 409 is in the shape of an inverted frustum. An air blowing mechanism 5 is provided on the side of the frame 1 near the lubrication mechanism 4. The limiting groove 409 limits the rack 404 to ensure the stability of the rack 404. The shape of the limiting groove 409 can prevent the dripping lubricant from accumulating inside the limiting groove 409. Specifically, due to the effect of gravity, the lubricant will flow naturally along these inclined surfaces to the edge of the limiting groove 409 and finally be discharged from the limiting groove 409.

[0025] Furthermore, the air blowing mechanism 5 includes a spur gear 501 meshing with a rack 404. The spur gear 501 is fixedly connected to a connecting shaft 502. A bevel gear set 503 is located at the end of the connecting shaft 502. A first connecting rod 504 is rotatably mounted on the top of the bevel gear set 503. A second connecting rod 505 is rotatably mounted on the end of the first connecting rod 504. The end of the second connecting rod 505 is rotatably mounted on a drive rod 506. An air blowing cylinder 507 is located at the output end of the drive rod 506. The air blowing cylinder 507 is fixedly mounted on a measuring plate 105, which is fixedly mounted on a frame 1. When the rack 404 moves downwards, the spur gear 501 meshes with the rack 404. 1. Rotate, and make the connecting shaft 502 rotate synchronously. The connecting shaft 502 drives the bevel gear set 503 to rotate, which in turn makes the first connecting rod 504 rotate. The first connecting rod 504 drives the drive rod 506 to move linearly through the second connecting rod 505. The end of the drive rod 506 is fixedly connected to the piston inside the air blower 507, thereby realizing the air intake action. When the rack 404 moves upward, the above-mentioned components move in opposite directions, realizing the air blowing action. The blown gas diffuses along the inner wall extension direction of the measuring plate 105, effectively reducing the loss after the gas is blown out, thereby realizing the cleaning of debris on the inner wall of the measuring plate and the cutting groove 104.

[0026] In addition, the measuring mechanism 3 includes a drive motor 301 mounted on the side wall of the frame 1. The output end of the drive motor 301 is provided with a one-way lead screw 302. The one-way lead screw 302 is threadedly connected to a sliding frame 303. A fixing block 304 is fixedly installed at the end of the sliding frame 303 away from the lifting mechanism 2, and a clamping mechanism 7 is fixedly installed at the end of the sliding frame 303 close to the lifting mechanism 2. The clamping mechanism 7 is a three-jaw chuck. After the drill bit is fixed by the clamping mechanism 7, the position of the sliding frame is changed by starting the drive motor 301, thereby determining the cutting length of the drill bit. Specifically, by controlling the rotation direction of the output shaft of the drive motor 301, the output shaft drives the one-way lead screw 302 to rotate. Through the threaded action between the one-way lead screw 302 and the sliding frame 303, the sliding frame 303 slides stably along the measuring groove 106, thereby meeting the measurement and cutting needs of different drill bits.

[0027] The sliding frame 303 is M-shaped. A set of legs of the sliding frame 303 away from the one-way lead screw 302 is slidably connected to a guide rod 305. The upper surface of the frame 1 is symmetrically provided with measuring grooves 106 for sliding the two sets of legs of the sliding frame 303. The M-shaped sliding frame 303 has two sets of support points. During the movement of the sliding frame 303, the length of the drill bit can be determined more accurately through the measuring plate 105. The guide rod 305 provides precise guidance for the movement of the sliding frame 303, ensuring that the sliding frame 303 moves along a predetermined straight line under the drive of the one-way lead screw 302, avoiding deviation, shaking or rotation of the sliding frame 302 during the movement, thereby ensuring the accuracy of the drill bit length measurement and the precision of the cutting position.

[0028] Furthermore, the lifting mechanism 2 includes a lifting motor 201 fixed at the top of the frame 1. The output shaft of the lifting motor 201 is equipped with a reciprocating lead screw 202. The reciprocating lead screw 202 is threadedly connected to a lifting block 203 for supporting the disc cutter 204. The surface of the frame 1 is provided with a lifting groove 102 for the lifting block 203 to slide. By controlling the rotation of the lifting motor 201, the cutting and resetting of the drill bit by the disc cutter 204 can be achieved. Specifically, when the lifting motor 201 is turned on, it drives the reciprocating lead screw 202 to rotate through its output shaft. Through the thread action, the lifting block 203 always makes a reciprocating linear motion in the vertical direction along the lifting groove 102. At the same time, the lifting block 203 drives the disc cutter 204 to make synchronous motion. By setting the distance between the disc cutter 204 and the cutting groove 104, the pre-cutting time of the next set of drill bits is controlled, thereby realizing continuous cutting of the drill bit.

[0029] It is worth noting that the lifting block 203 is fixedly connected to the lifting rack 205, which is engaged with the centering mechanism 6 for centering the drill bit. The lifting groove 102 has a sliding groove 103 for the lifting rack 205 to slide. The centering mechanism 6 consists of a base, a ring rack, three sets of positioning arms, and springs. The ends of the three sets of positioning arms are rotatably connected to rollers. Specifically, when the drill bit is cutting, the lifting block 203 moves downward, driving the lifting rack 205 to move downward synchronously. Through the engagement of the lifting rack 205 and the ring rack, the three sets of positioning arms of the centering mechanism 6 rotate and center and clamp the drill bit. After the cutting operation is completed, the lifting block 203 is reset by the lifting rack 205 to prepare for the next cutting operation. Throughout the process, the springs play a buffering role in the positioning process, ensuring the stability and reliability of the positioning. The arrangement of the three sets of positioning arms and rollers avoids deformation caused by uneven force on the drill bit during the cutting process, thereby further improving product quality.

[0030] In addition, the surface of the frame 1 is provided with a cutting groove 104 for the drill bit to pass through. The cutting groove 104 is connected to the sliding groove 103. The cutting groove 104 provides a clear cutting channel for the drill bit, reducing the splashing of debris and sparks generated during the cutting process. The bottom of the sliding groove 103 is connected to the outside. The debris that falls into the cutting groove 104 during the cutting process will fall below the frame 1, making it easy to collect and clean the debris generated during cutting.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A raw material cutting device for a drill bit production, characterized by, The system includes a frame (1), a lifting mechanism (2) is provided above the frame (1), a disc cutter (204) for cutting drill bits is provided at the output end of the lifting mechanism (2), a measuring mechanism (3) for adjusting the length of the drill bit is provided on the side of the frame (1) away from the lifting mechanism (2), a clamping mechanism (7) for clamping the drill bit is provided on the side of the measuring mechanism (3) close to the lifting mechanism (2), a lubrication mechanism (4) is provided on the side of the measuring mechanism (3) away from the clamping mechanism (7), and a fixing block (304) for driving the lubrication mechanism (4) to output oil is provided on the other side of the measuring mechanism (3). The lubrication mechanism (4) includes a contact plate (401) that contacts the fixed block (304) during use. A connecting plate (402) is provided on the inner side of the contact plate (401). A sliding plate (407) is provided at one end of the connecting plate (402) away from the contact plate (401). A guide rail (403) is provided on the side surface of the connecting plate (402) near the lifting mechanism (2). The guide rail (403) is inclined and forms an acute angle with the horizontal plane. The connecting plate (402) is close to the lifting mechanism. A rack (404) is provided on one side of the structure (2). A mating groove (405) that cooperates with the guide rail (403) is opened on the surface of the rack (404) near the connecting plate (402). An oil extraction pipe (406) is provided inside the rack (404). An oil bag (412) is provided above the oil extraction pipe (406). An outlet hole (410) is connected to the oil extraction pipe (406). The end of the outlet hole (410) is connected to the measuring mechanism (3).

2. The raw material cutting device for drill bit production according to claim 1, characterized in that, The contact plate (401) is arc-shaped, and the fixing block (304) has a protrusion at one end near the lubrication mechanism (4) for driving the contact plate (401) to slide twice.

3. The raw material cutting device for drill bit production according to claim 1, characterized in that, The frame (1) has a slot (101) on the side surface away from the lifting mechanism (2). The sliding plate (407) is slidably installed inside the slot (101), and the size of the sliding plate (407) perfectly matches the size of the slot (101). The end of the sliding plate (407) away from the contact plate (401) is provided with a reset spring (408) for resetting the lubrication mechanism (4).

4. The raw material cutting device for drill bit production according to claim 1, characterized in that, The frame (1) has a limiting groove (409) inside for sliding of the straight rack (404). The bottom of the limiting groove (409) is in the shape of an inverted truncated pyramid. The frame (1) has an air blowing mechanism (5) on the side near the lubrication mechanism (4).

5. The raw material cutting device for drill bit production according to claim 4, characterized in that, The air blowing mechanism (5) includes a spur gear (501) meshing with a rack (404). The spur gear (501) is fixedly connected to a connecting shaft (502). The end of the connecting shaft (502) is provided with a bevel gear set (503). The top end of the bevel gear set (503) is rotatably mounted with a first connecting rod (504). The end of the first connecting rod (504) is rotatably mounted with a second connecting rod (505). The end of the second connecting rod (505) is rotatably mounted on a drive rod (506). The output end of the drive rod (506) is provided with an air blowing cylinder (507). The air blowing cylinder (507) is fixedly mounted on a measuring plate (105). The measuring plate (105) is fixedly mounted on a frame (1).

6. The raw material cutting device for drill bit production according to claim 1, characterized in that, The measuring mechanism (3) includes a drive motor (301) mounted on the side wall of the frame (1). The output end of the drive motor (301) is provided with a one-way lead screw (302). The one-way lead screw (302) is threadedly connected to a sliding frame (303). A fixing block (304) is fixedly installed at the end of the sliding frame (303) away from the lifting mechanism (2). A clamping mechanism (7) is fixedly installed at the end of the sliding frame (303) close to the lifting mechanism (2).

7. The raw material cutting device for drill bit production according to claim 6, characterized in that, The sliding frame (303) is M-shaped. A set of legs of the sliding frame (303) away from the one-way lead screw (302) is slidably connected to a guide rod (305). The upper surface of the frame (1) is symmetrically provided with measuring grooves (106) for sliding the two sets of legs of the sliding frame (303).

8. A raw material cutting device for drill bit production according to claim 1, characterized in that, The lifting mechanism (2) includes a lifting motor (201) at the top of the fixed frame (1). The output shaft of the lifting motor (201) is provided with a reciprocating screw (202). The reciprocating screw (202) is threadedly connected to a lifting block (203) for carrying the disc cutter (204). The surface of the frame (1) is provided with a lifting groove (102) for the lifting block (203) to slide.

9. A raw material cutting device for drill bit production according to claim 8, characterized in that, The lifting block (203) is fixedly connected to a lifting rack (205), and the lifting rack (205) is engaged with a centering mechanism (6) for centering the drill bit. The lifting groove (102) has a sliding groove (103) inside for the lifting rack (205) to slide.

10. A raw material cutting device for drill bit production according to claim 1, characterized in that, The frame (1) has a cutting groove (104) on its surface for the drill bit to pass through, and the cutting groove (104) is connected to the sliding groove (103).

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