Cutting device for metal sleeves and method of operation thereof
By designing a metal sleeve cutting device with an offset module and a tool mounting unit, the problems of tool length limitation and angle adjustment were solved, enabling deep machining of tapered inner holes and automatic chip removal, ensuring machining accuracy and practicality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NINGBO LEZHI ELECTRONIC TECH CO LTD
- Filing Date
- 2026-03-13
- Publication Date
- 2026-05-12
AI Technical Summary
In existing cutting machine tools, the tool length limits the machining depth of tapered inner holes, and the fixed angle adjustment of the tool is difficult, which affects the machining accuracy, makes manufacturing difficult, and makes waste chip disposal inconvenient.
A metal sleeve cutting device was designed, which adopts an offset module and a tool loading unit. The strip cutter is inserted into the conical inner hole by using an extension sleeve, and the angle is adjusted by linkage transmission. Combined with compressed air, the waste chips are automatically cleaned up.
Breakthroughs in the machining depth limitation of conical inner holes with low material costs, reduce the difficulty of angle adjustment, ensure machining accuracy, and achieve automatic chip removal, thereby improving practicality.
Smart Images
Figure CN121820708B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cutting equipment technology, and in particular to a cutting device for metal sleeves and its operating method. Background Technology
[0002] Metal sleeves are sleeve-type parts made of metal materials, widely used in mechanical connections, building structures, tool systems and many other fields. Currently, the processing of metal sleeves is mainly accomplished by cutting machine tools.
[0003] In existing cutting machine tools, the cutting tools are directly fixed to the moving frame via a tool holder. Due to the short length of the cutting tools and the inability of the tool holder to extend into the metal sleeve, the machining depth of the tapered inner hole is limited by the tool length. Furthermore, the material cost for manufacturing these tools is high. While increasing the tool length could overcome the machining depth limitation, it also increases material costs. Simultaneously, the tool's fixed angle adjustment mechanism is directly located between the tool and the tool holder, resulting in high sensitivity in the relative positional relationship between them. This makes manual adjustment difficult and cannot be accurately determined by the naked eye, thus affecting machining accuracy. Moreover, if the tapered inner hole to be machined has multiple angles, even if a tool is added so that its cutting edge can extend into the tapered inner hole, other parts of the tool may interfere or collide with the previously machined inner wall. This necessitates abandoning the conventional straight-bar structure of the tool and adopting a curved shape, but this is difficult to manufacture and lacks practicality, requiring urgent solutions. Summary of the Invention
[0004] In view of the current state of the prior art, the technical problem to be solved by the present invention is to provide a cutting device and its operating method for a metal sleeve that breaks through the limitation of the machining depth of the tapered inner hole while ensuring low material cost, reduces the difficulty of manually adjusting the tilt angle of the strip cutter to ensure machining accuracy, reduces the manufacturing difficulty of the tool, and automatically discharges waste chips to improve practicality.
[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: a cutting device for a metal sleeve, comprising a frame and a main unit disposed on the top left side of the frame; the main unit includes a power head and a chuck concentrically disposed on the output shaft of the power head, the output shaft of the power head being arranged laterally to the right and capable of driving the chuck to rotate, characterized in that:
[0006] It also includes a tool holder located on the top of the frame and on the right side of the main unit. The tool holder includes a movable seat movably connected to the frame to have left and right translation function, a traction seat movably connected to the top of the movable seat to have front and back translation function, and an offset module located on the frame and connected to the traction seat.
[0007] The offset module includes a reference plate and an adjustment plate fixed horizontally to the top of the frame and respectively positioned to the left and right; a scale rod horizontally and rotatably connected to the reference plate; a sliding sleeve movably sleeved outside the scale rod to allow it to move back and forth along the length of the scale rod; and a connecting rod horizontally fixed to the traction seat and located above the scale rod. The end of the scale rod is detachably fixed to the adjustment plate and can be swung to adjust its fixed position to change the inclination of the scale rod. The end of the connecting rod is rotatably connected to the sliding sleeve.
[0008] The tool holder also includes a tool mounting unit located on top of the traction seat. The tool mounting unit includes a support plate that is horizontally fixed on the traction seat and can be horizontally adjusted in all directions; a V-shaped base that is horizontally fixed on top of the support plate; a first limiting arm that is rotatably connected to the right end of the V-shaped base; a second limiting arm that is rotatably connected to the middle of the V-shaped base; an internally threaded sleeve that is rotatably connected to the first limiting arm; an adjusting screw that is concentrically threaded into the internally threaded sleeve; and a tool module located between the first limiting arm and the second limiting arm. The front end of the adjusting screw is rotatably connected to the left end of the V-shaped base.
[0009] The cutting tool module includes a traction arm and an extension sleeve that are arranged laterally and fixed to each other, and a strip cutter that is detachably fixed to the extension sleeve. The two ends of the traction arm are rotatably connected to the ends of the first limiting arm and the second limiting arm, respectively. One end of the extension sleeve is closed and fixed to the end of the traction arm that is connected to the second limiting arm, and the other end of the extension sleeve is open. The strip cutter is detachably inserted and fixed laterally to the other end of the extension sleeve.
[0010] Preferably, an air inlet pipe that communicates with the interior of the extension sleeve is also sealed and inserted into one side of the closed end of the extension sleeve.
[0011] Preferably, the inner diameter of the extension sleeve is greater than the upper and lower thicknesses of the strip cutter.
[0012] Preferably, the offset module further includes a support shaft that is vertically and rotatably connected to the top outer wall of the sliding sleeve. The end of the connecting rod is provided with a slot. Correspondingly, the center of the end of the support shaft is formed with a vertically arranged convex shaft. The end of the convex shaft passes vertically through the slot and extends above the connecting rod. The end of the convex shaft is also fitted with a screw-on knob nut, which is pressed against the top outer wall of the connecting rod.
[0013] Preferably, the top of the adjusting plate has an arc-shaped scale area that is concentrically distributed with the rotation axis of the base of the scale rod and located to the right of the end of the scale rod. Correspondingly, the outer wall of the end of the scale rod has vertically distributed indicator teeth that cooperate with the arc-shaped scale area.
[0014] Preferably, a rectangular through hole is provided between the front and rear outer walls of the closed end of the extension sleeve, and the strip cutter is horizontally inserted into the rectangular through hole. A vertically arranged positioning screw is also inserted and screwed into the upper side of the closed end of the extension sleeve, and the threaded end of the positioning screw is pressed against the upper outer wall of the strip cutter.
[0015] Preferably, the upper outer wall of the strip cutter is provided with a plurality of transversely distributed grooves arranged sequentially along the length of the strip cutter, and the threaded end of the positioning screw is inserted into one of the grooves and pressed against the bottom of the groove to prevent the strip cutter from shifting laterally.
[0016] A method for operating a cutting device for a metal sleeve, characterized by comprising the following steps:
[0017] S1: Take a metal sleeve and drill a through hole between the centers of the outer walls of its two ends. Then fix the metal sleeve horizontally on the chuck and set one end of the metal sleeve with the opening facing to the right.
[0018] S2: Twist the handwheel by hand to drive the adjusting screw to rotate in the internal threaded sleeve. Then, based on the principle of screw connection and with the help of the internal threaded sleeve, drive the first limit arm to swing. Then, with the help of the traction arm, drive the second limit arm and the extension sleeve to swing simultaneously until the extension sleeve is adjusted to be parallel to the central axis of the metal sleeve.
[0019] S3: Operate the first and second manual slides to adjust the front, back, left and right positions of the tray laterally, and then adjust the position of the strip cutter with the help of the extension sleeve, so that the strip cutter extends into the interior of the through hole, and at the same time, the front or rear blade of the strip cutter is attached to the inner wall of the corresponding position of the through hole.
[0020] S4: Based on the design value of the tapered inner hole inclination and with the help of the interplay between the arc-shaped scale area on the adjustment plate and the indicator teeth, swing and adjust the fixed position of the end of the scale rod to determine the inclination angle of the scale rod; then loosen the knob nut and move the traction seat back and forth to adjust its front and back fixed position laterally, and tighten the knob nut after adjustment to complete the adjustment of the initial position of the traction seat.
[0021] S5: The power head is turned on to rotate the metal sleeve with the help of the chuck. The moving seat in the drive tool holder moves to the left gradually, and the tool loading unit moves synchronously with the help of the traction seat. Then, the sliding sleeve moves to the left along the scale rod with the help of the connecting rod in the offset module. Thus, with the help of the slope of the scale rod and the rotational connection between the support shaft and the sliding sleeve, the traction seat is forced to move forward or backward while moving to the left, which in turn drives the strip cutter to move at an angle, thereby gradually cutting a tapered countersunk hole on the inner wall of the through hole.
[0022] S6: During cutting, compressed air is connected to the end opening of the air inlet pipe, allowing the compressed air to enter the extension sleeve. Since the inner diameter of the extension sleeve is larger than the upper and lower thickness of the strip cutter, the compressed air is split into two streams by the strip cutter when it reaches the strip cutter. At the same time, the cross-sectional area of the extension sleeve is reduced by the strip cutter, thus the air pressure of the two streams is further enhanced. Finally, the air is blown out through the opening end of the extension sleeve. The blown air directly impacts the bottom of the conical countersunk hole, thereby quickly and thoroughly discharging the debris generated during the processing to achieve an automatic cleaning effect.
[0023] S7: If the inner wall of the above-mentioned conical countersunk hole has two or more different slopes, in order to avoid interference between the extension sleeve and the already processed conical inner wall, the extension sleeve needs to be adjusted to be inclined.
[0024] Preferably, step S7 includes the following steps:
[0025] S71: Turn off the power head and drive the moving seat to the right until the extension sleeve is completely away from the metal sleeve. Then, adjust the slope of the scale rod according to the design slope of the inner wall of the lower section of the conical countersunk hole.
[0026] S72: Twist the handwheel to adjust the tilt angle of the extension sleeve to match the slope of the inner wall of the tapered countersunk hole. Then, adjust the front, back, left and right positions of the traction seat by means of the first manual slide, the second manual slide and the knob nut.
[0027] S73: Drive the moving seat to move to the left again so that the extension sleeve extends into the bottom of the inner wall of the upper section of the tapered countersunk hole, until the front or rear end of the strip cutter is attached to the root edge of the inner wall of the upper section of the tapered countersunk hole. Then turn on the power head again to drive the metal sleeve to rotate, so that the tapered inner wall with different slopes in the lower section of the tapered countersunk hole can be processed with the help of the strip cutter.
[0028] Compared with the prior art, the advantages of the present invention are as follows:
[0029] This invention utilizes a tool mounting unit to fix a strip cutter onto an extension sleeve. By employing a shorter length, the strip cutter can extend into the metal sleeve via the extension sleeve and machine a tapered countersunk hole inside the metal sleeve. This overcomes the limitation of tapered inner hole machining depth while ensuring lower material costs. Simultaneously, an offset module is installed between the traction seat and the frame, amplifying the offset ratio of the traction seat using a linkage transmission principle. This reduces the sensitivity of the strip cutter's angle adjustment, thereby simplifying the manual adjustment of the strip cutter's tilt angle, allowing for precise visual adjustment. This ensures machining accuracy. Furthermore, when the taper of the tapered inner hole to be machined has more than one angle, the extension sleeve can be changed by means of the tool mounting unit so that the front or rear cutting edge of the strip cutter can smoothly extend into the tapered inner hole, while preventing the extension sleeve from interfering or colliding with the inner wall that has already been machined. This eliminates the need to modify the conventional structure of the tool, reducing the manufacturing difficulty of the tool and improving its practicality. In addition, the present invention can also blow compressed air into the interior of the tapered inner hole during the cutting process by means of the extension sleeve 497 to automatically discharge the waste chips, thereby further improving its practicality. Attached Figure Description
[0030] The above and other features, advantages, and aspects of the embodiments of this application will become more apparent when taken in conjunction with the accompanying drawings and the following detailed description; throughout the drawings, the same or similar reference numerals denote the same or similar elements; it should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale; in the drawings:
[0031] Figure 1 This is a top view of the right front side of the present invention;
[0032] Figure 2 This is a top view of the left rear side of the tool mounting unit of the present invention;
[0033] Figure 3 For the present invention Figure 2 A magnified view of the structure at point A. Detailed Implementation
[0034] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. The term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0035] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.
[0036] like Figures 1-3 As shown, a cutting device for a metal sleeve includes a frame 1 and a main unit 2 located on the top left side of the frame 1; the main unit 2 includes a power head 21 and a chuck 22 concentrically mounted on the output shaft of the power head 21. The output shaft of the power head 21 is arranged laterally to the right and can drive the chuck 22 to rotate. The above structure and principle are all existing technologies.
[0037] The present invention is characterized in that it also includes a tool holder 4 located on the top of the frame 1 and to the right of the host 2. The tool holder 4 includes a movable seat 41 movably connected to the frame 1 to have a left and right translation function, a traction seat 42 movably connected to the top of the movable seat 41 to have a front and back translation function, and an offset module located on the frame 1 and connected to the traction seat 42.
[0038] The offset module includes a reference plate 44 and an adjustment plate 43 that are horizontally fixed to the top of the frame 1 and respectively arranged on the left and right; a scale rod 45 that is horizontally and rotatably connected to the reference plate 44; a sliding sleeve 46 that is movably sleeved outside the scale rod 45 to allow it to move back and forth along the length of the scale rod 45; and a connecting rod 48 that is horizontally fixed to the traction seat 42 and located above the scale rod 45. The end of the scale rod 45 is detachably fixed to the adjustment plate 43 and can swing to adjust the fixed position to change the inclination of the scale rod 45. The end of the connecting rod 48 is rotatably connected to the sliding sleeve 46.
[0039] The tool holder 4 also includes a tool mounting unit 49 located on the top of the traction seat 42. The tool mounting unit 49 includes a support plate 4910 that is horizontally fixed on the traction seat 42 and can be horizontally adjusted in the front, back, left and right directions; a V-shaped base 491 that is horizontally fixed on the top of the support plate 4910; a first limiting arm 492 that is rotatably connected to the right end of the V-shaped base 491; a second limiting arm 493 that is rotatably connected to the middle of the V-shaped base 491; an internal threaded sleeve 496 that is rotatably connected to the first limiting arm 492; an adjusting screw 495 that is concentrically screwed into the internal threaded sleeve 496; and a tool module located between the first limiting arm 492 and the second limiting arm 493. The front end of the adjusting screw 495 is rotatably connected to the left end of the V-shaped base 491.
[0040] The cutting tool module includes a traction arm 494 and an extension sleeve 497 that are arranged laterally and fixed to each other, and a strip cutter 498 that is detachably fixed on the extension sleeve 497. The two ends of the traction arm 494 are rotatably connected to the ends of the first limiting arm 492 and the second limiting arm 493, respectively. One end of the extension sleeve 497 is closed and fixed to the end of the traction arm 494 that is connected to the second limiting arm 493. The other end of the extension sleeve 497 is open. The strip cutter 498 is detachably and laterally inserted and fixed to the other end of the extension sleeve 497.
[0041] An air inlet pipe 499, which communicates with the interior of the extension sleeve 497, is also sealed and inserted into one side of the closed end of the extension sleeve 497.
[0042] The inner diameter of the extension sleeve 497 is greater than the upper and lower thicknesses of the strip cutter 498.
[0043] The offset module also includes a support shaft 47 that is vertically and rotatably connected to the top outer wall of the sliding sleeve 46. The end of the connecting rod 48 is provided with a slot 481. Correspondingly, a vertically arranged convex shaft 471 is formed at the center of the end of the support shaft 47. The end of the convex shaft 471 passes vertically through the slot 481 and extends above the connecting rod 48. A knob nut 410 is also screwed onto the end of the convex shaft 471. The knob nut 410 is pressed against the top outer wall of the connecting rod 48.
[0044] The top of the adjustment plate 43 has an arc-shaped scale area 432 that is concentrically distributed with the rotation axis of the root of the scale rod 45 and located to the right of the end of the scale rod 45. Correspondingly, the outer wall of the end of the scale rod 45 has vertically distributed indicator teeth 451 that cooperate with the arc-shaped scale area 432.
[0045] The adjusting plate 43 has an arc-shaped groove 431 that is concentric with the rotation axis of the root of the scale rod 45. The end of the scale rod 45 is detachably fixed in the arc-shaped groove 431 and can swing along the direction of the arc-shaped groove 431 to adjust the fixed position.
[0046] A rectangular through hole 4971 is provided between the front and rear outer walls of the closed end of the extension sleeve 497. A strip cutter 498 is horizontally inserted into the rectangular through hole 4971. A vertically arranged positioning screw 4911 is also inserted and screwed into the upper side of the closed end of the extension sleeve 497. The threaded end of the positioning screw 4911 is pressed against the upper outer wall of the strip cutter 498.
[0047] The upper outer wall of the strip cutter 498 is provided with multiple transversely distributed toothed grooves 4981 arranged sequentially along the length of the strip cutter 498. The threaded end of the positioning screw 4911 is inserted into one of the toothed grooves 4981 and pressed against the bottom of the toothed groove 4981 to prevent the strip cutter 498 from shifting laterally.
[0048] The tool holder 4 also includes a first manual slide 4913 fixed to the top of the traction seat 42, a second manual slide 4914 fixed to the moving end of the first manual slide 4913 to enable forward and backward translation with the aid of the first manual slide 4913, and a support plate 4910 laterally fixed to the moving end of the second manual slide 4914 to enable left and right translation with the aid of the second manual slide 4914.
[0049] The end of the adjusting screw 495 is also fixed with a concentrically arranged handwheel 4912.
[0050] Operating method of a cutting device for metal sleeves:
[0051] S1: Take a metal sleeve 3 and drill a through hole 31 between the centers of the outer walls of its two ends. Then fix the metal sleeve 3 horizontally on the chuck 22 and set one end of the metal sleeve 3 with the opening facing to the right.
[0052] S2: Twist the handwheel 4912 by hand to drive the adjusting screw 495 to rotate in the internal threaded sleeve 496. Then, based on the principle of spiral connection and with the help of the internal threaded sleeve 496, drive the first limiting arm 492 to swing. Then, with the help of the traction arm 494, drive the second limiting arm 493 and the extension sleeve 497 to swing simultaneously until the extension sleeve 497 is adjusted to be parallel to the central axis of the metal sleeve 3.
[0053] S3: Operate the first manual slide 4913 and the second manual slide 4914 to adjust the front, back and left and right positions of the support plate 4910 laterally, and then adjust the position of the strip cutter 498 with the help of the extension sleeve 497, so that the strip cutter 498 extends into the interior of the through hole 31, and at the same time, make the front or rear blade of the strip cutter 498 fit against the inner wall of the corresponding position of the through hole 31.
[0054] S4: Based on the design value of the tapered inner hole slope and with the help of the interplay between the arc-shaped scale area 432 on the adjusting plate 43 and the indicator protrusion 451, swing and adjust the fixed position of the end of the scale rod 45 to determine the tilt angle of the scale rod 45; then loosen the knob nut 410 and move the traction seat 42 back and forth to adjust its front and back fixed position laterally, and tighten the knob nut 410 after adjustment to complete the adjustment of the initial position of the traction seat 42;
[0055] S5: The power head 21 is turned on to drive the metal sleeve 3 to rotate with the help of the chuck 22. The moving seat 41 in the drive tool holder 4 gradually moves to the left so as to drive the tool loading unit 49 to move synchronously with the help of the traction seat 42. Then, the sliding sleeve 46 moves to the left along the scale rod 45 with the help of the connecting rod 48 in the offset module. Thus, with the help of the slope of the scale rod 45 and the rotational connection between the support shaft 47 and the sliding sleeve 46, the traction seat 42 is forced to move forward or backward while moving to the left, thereby driving the strip cutter 498 to move at an angle synchronously, thereby gradually cutting a tapered countersunk hole on the inner wall of the through hole 31.
[0056] S6: During cutting, compressed air is connected to the end opening of the air inlet pipe 499, allowing the compressed air to enter the extension sleeve 497. Since the inner diameter of the extension sleeve 497 is larger than the upper and lower thicknesses of the strip cutter 498, when the compressed air reaches the strip cutter 498, it is divided into upper and lower airflows by the strip cutter 498. At the same time, since the cross-sectional area of the extension sleeve 497 is reduced by the strip cutter 498, the air pressure of the two airflows is further enhanced. Finally, the airflow is blown out through the opening end of the extension sleeve 497. The blown airflow directly impacts the bottom of the conical countersunk hole, thereby quickly and thoroughly discharging the debris generated during the processing to achieve the effect of automatic cleaning.
[0057] S7: If the inner wall of the above-mentioned conical countersunk hole has two or more different slopes, in order to avoid interference between the extension sleeve 497 and the already processed conical inner wall, the extension sleeve 497 needs to be adjusted to be inclined.
[0058] The adjustment steps are as follows:
[0059] First, shut down the power head 21 and drive the moving seat 41 to move to the right until the extension sleeve 497 is completely away from the metal sleeve 3. Then, adjust the slope of the scale rod 45 according to the design slope of the inner wall of the lower section of the conical countersunk hole.
[0060] Secondly, turn the handwheel 4912 to adjust the tilt angle of the extension sleeve 497 to match the slope of the inner wall of the tapered countersunk hole. Then, adjust the front, back, left and right positions of the traction seat 42 with the help of the first manual slide 4913, the second manual slide 4914 and the knob nut 410.
[0061] Finally, the drive moving seat 41 moves to the left again so that the extension sleeve 497 extends into the bottom of the inner wall of the upper section of the conical countersunk hole, until the front or rear end of the strip cutter 498 is attached to the root edge of the inner wall of the upper section of the conical countersunk hole. Then, the power head 21 is turned on again to drive the metal sleeve 3 to rotate, so that the lower section of the conical inner wall with different slopes can be processed with the help of the strip cutter 498.
[0062] This invention uses a tool mounting unit 49 to fix a strip cutter 498 onto an extension sleeve 497. By using a shorter length, the strip cutter 498 can extend into the metal sleeve via the extension sleeve 497 and machine a tapered countersunk hole inside the metal sleeve. This overcomes the limitation of tapered inner hole machining depth while ensuring low material costs. Simultaneously, an offset module is installed between the traction seat 42 and the frame 1, amplifying the offset ratio of the traction seat 42 using the principle of linkage transmission. This reduces the sensitivity of the strip cutter 498's angle adjustment, thereby lowering the difficulty of manually adjusting the tilt angle of the strip cutter 498, even with manual adjustment. The eye can accurately distinguish the angles, thus ensuring machining accuracy. Furthermore, when there is more than one type of slope for the tapered inner hole to be machined, the extension sleeve 497 can be changed by the tool mounting unit 49 so that the front or rear cutting edge of the strip cutter 498 can smoothly extend into the tapered inner hole, while preventing the extension sleeve 497 from interfering or colliding with the previously machined inner wall. This eliminates the need to modify the conventional structure of the tool, reducing the manufacturing difficulty of the tool and improving its practicality. In addition, the present invention can also blow compressed air into the interior of the tapered inner hole during the cutting process by means of the extension sleeve 497 to automatically discharge the waste chips, thereby further improving its practicality.
[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A cutting device for metal sleeves, comprising a frame and a main unit disposed on the top left side of the frame; the main unit includes a power head and a chuck concentrically disposed on the output shaft of the power head, the output shaft of the power head being arranged laterally to the right and capable of driving the chuck to rotate, characterized in that: It also includes a tool holder located on the top of the frame and on the right side of the main unit. The tool holder includes a movable seat movably connected to the frame to have left and right translation function, a traction seat movably connected to the top of the movable seat to have front and back translation function, and an offset module located on the frame and connected to the traction seat. The offset module includes a reference plate and an adjustment plate fixed horizontally to the top of the frame and respectively positioned to the left and right; a scale rod horizontally and rotatably connected to the reference plate; a sliding sleeve movably sleeved outside the scale rod to allow it to move back and forth along the length of the scale rod; and a connecting rod horizontally fixed to the traction seat and located above the scale rod. The end of the scale rod is detachably fixed to the adjustment plate and can be swung to adjust its fixed position to change the inclination of the scale rod. The end of the connecting rod is rotatably connected to the sliding sleeve. The tool holder also includes a tool mounting unit located on top of the traction seat. The tool mounting unit includes a support plate that is horizontally fixed on the traction seat and can be horizontally adjusted in all directions; a V-shaped base that is horizontally fixed on top of the support plate; a first limiting arm that is rotatably connected to the right end of the V-shaped base; a second limiting arm that is rotatably connected to the middle of the V-shaped base; an internally threaded sleeve that is rotatably connected to the first limiting arm; an adjusting screw that is concentrically threaded into the internally threaded sleeve; and a tool module located between the first limiting arm and the second limiting arm. The front end of the adjusting screw is rotatably connected to the left end of the V-shaped base. The cutting tool module includes a traction arm and an extension sleeve that are arranged laterally and fixed to each other, and a strip cutter that is detachably fixed to the extension sleeve. The two ends of the traction arm are rotatably connected to the ends of the first limiting arm and the second limiting arm, respectively. One end of the extension sleeve is closed and fixed to the end of the traction arm that is connected to the second limiting arm, and the other end of the extension sleeve is open. The strip cutter is detachably inserted and fixed laterally to the other end of the extension sleeve.
2. The cutting device for a metal sleeve according to claim 1, characterized in that, The closed end of the extension sleeve is also sealed with an air inlet pipe that communicates with the inside of the extension sleeve.
3. The cutting device for a metal sleeve according to claim 1, characterized in that, The inner diameter of the extension sleeve is greater than the upper and lower thicknesses of the strip cutter.
4. The cutting device for a metal sleeve according to claim 1, characterized in that, The offset module also includes a support shaft that is vertically and rotatably connected to the top outer wall of the sliding sleeve. The end of the connecting rod is provided with a slot. Correspondingly, the center of the end of the support shaft is formed with a vertically arranged convex shaft. The end of the convex shaft passes vertically through the slot and extends above the connecting rod. The end of the convex shaft is also fitted with a screw-on knob nut, which is pressed against the top outer wall of the connecting rod.
5. The cutting device for a metal sleeve according to claim 1, characterized in that, The top of the adjustment plate has an arc-shaped scale area that is concentric with the rotation axis of the base of the scale rod and located to the right of the end of the scale rod. Correspondingly, the outer wall of the end of the scale rod has vertically distributed indicator teeth that cooperate with the arc-shaped scale area.
6. The cutting device for a metal sleeve according to claim 1, characterized in that, A rectangular through hole is provided between the front and rear outer walls of the closed end of the extension sleeve. The strip cutter is horizontally inserted into the rectangular through hole. A vertically arranged positioning screw is also inserted and screwed into the upper side of the closed end of the extension sleeve. The threaded end of the positioning screw is pressed against the upper outer wall of the strip cutter.
7. The cutting device for a metal sleeve according to claim 6, characterized in that, The upper outer wall of the strip cutter is provided with multiple transversely distributed toothed grooves arranged sequentially along the length of the strip cutter. The threaded end of the positioning screw is inserted into one of the toothed grooves and pressed against the bottom of the toothed groove to prevent the strip cutter from shifting laterally.
8. The operating method of the cutting device for a metal sleeve according to claim 1, characterized in that, Includes the following steps: S1: Take a metal sleeve and drill a through hole between the centers of the outer walls of its two ends. Then fix the metal sleeve horizontally on the chuck and set one end of the metal sleeve with the opening facing to the right. S2: Twist the handwheel by hand to drive the adjusting screw to rotate in the internal threaded sleeve. Then, based on the principle of screw connection and with the help of the internal threaded sleeve, drive the first limit arm to swing. Then, with the help of the traction arm, drive the second limit arm and the extension sleeve to swing simultaneously until the extension sleeve is adjusted to be parallel to the central axis of the metal sleeve. S3: Operate the first and second manual slides to adjust the front, back, left and right positions of the tray laterally, and then adjust the position of the strip cutter with the help of the extension sleeve, so that the strip cutter extends into the interior of the through hole, and at the same time, the front or rear blade of the strip cutter is attached to the inner wall of the corresponding position of the through hole. S4: Based on the design value of the tapered inner hole inclination and with the help of the interplay between the arc-shaped scale area on the adjustment plate and the indicator teeth, swing and adjust the fixed position of the end of the scale rod to determine the inclination angle of the scale rod; then loosen the knob nut and move the traction seat back and forth to adjust its front and back fixed position laterally, and tighten the knob nut after adjustment to complete the adjustment of the initial position of the traction seat. S5: The power head is turned on to rotate the metal sleeve with the help of the chuck. The moving seat in the drive tool holder moves to the left gradually, and the tool loading unit moves synchronously with the help of the traction seat. Then, the sliding sleeve moves to the left along the scale rod with the help of the connecting rod in the offset module. Thus, with the help of the slope of the scale rod and the rotational connection between the support shaft and the sliding sleeve, the traction seat is forced to move forward or backward while moving to the left, which in turn drives the strip cutter to move at an angle, thereby gradually cutting a tapered countersunk hole on the inner wall of the through hole. S6: During cutting, compressed air is connected to the end opening of the air inlet pipe, allowing the compressed air to enter the extension sleeve. Since the inner diameter of the extension sleeve is larger than the upper and lower thickness of the strip cutter, the compressed air is split into two streams by the strip cutter when it reaches the strip cutter. At the same time, the cross-sectional area of the extension sleeve is reduced by the strip cutter, thus the air pressure of the two streams is further enhanced. Finally, the air is blown out through the opening end of the extension sleeve. The blown air directly impacts the bottom of the conical countersunk hole, thereby quickly and thoroughly discharging the debris generated during the processing to achieve an automatic cleaning effect. S7: If the inner wall of the above-mentioned conical countersunk hole has two or more different slopes, in order to avoid interference between the extension sleeve and the already processed conical inner wall, the extension sleeve needs to be adjusted to be inclined.
9. The operating method according to claim 8, characterized in that, Step S7 includes the following steps: S71: Turn off the power head and drive the moving seat to the right until the extension sleeve is completely away from the metal sleeve. Then, adjust the slope of the scale rod according to the design slope of the inner wall of the lower section of the conical countersunk hole. S72: Twist the handwheel to adjust the tilt angle of the extension sleeve to match the slope of the inner wall of the tapered countersunk hole. Then, adjust the front, back, left and right positions of the traction seat by means of the first manual slide, the second manual slide and the knob nut. S73: Drive the moving seat to move to the left again so that the extension sleeve extends into the bottom of the inner wall of the upper section of the tapered countersunk hole, until the front or rear end of the strip cutter is attached to the root edge of the inner wall of the upper section of the tapered countersunk hole. Then turn on the power head again to drive the metal sleeve to rotate, so that the tapered inner wall with different slopes in the lower section of the tapered countersunk hole can be processed with the help of the strip cutter.