Multi-specification bar automatic centering chuck and using method thereof

Abstract

The invention discloses a multi-specification bar automatic centering chuck and a using method thereof, and relates to the technical field of chucks. The multi-specification bar automatic centering chuck comprises a mounting frame, the mounting frame is provided with a rotating eccentric mechanism, the rotating eccentric mechanism is connected with the automatic centering chuck, the automatic centering chuck is provided with a protective shell, the front end face of the protective shell is provided with three centering sliding blocks, the rear ends of the centering sliding blocks are provided with centering blocks, and the centering blocks are connected with the rotating eccentric mechanism. The centering block is connected with a centering ring, the centering ring is arranged in the rotary centering disc, the rear portion of the rotary centering disc is connected with an automatic centering ring, the automatic centering ring is provided with three spring connecting bases, the spring connecting bases are connected with extension springs, and an inner ring of the protective shell is connected with three spring fixing bases. The spring fixing seat is connected with the other end of the extension spring, and the rear portion of the automatic centering ring is connected with a rotary control disc.

Description

Technical Field

[0001] This invention relates to the field of chuck technology, specifically to an automatic centering chuck for multi-specification bar stock and its usage method. Background Technology

[0002] The chuck is one of the key components used to secure workpieces in machining. In actual machining processes, the chuck not only needs to firmly clamp the workpiece but also ensure its stability during machining, preventing vibration or loosening from affecting machining quality. The performance of the chuck directly determines the accuracy and efficiency of machining. A well-designed, well-manufactured, and properly used chuck can significantly improve the stability and accuracy of the machining process, thereby increasing production efficiency and ensuring product quality. Therefore, selecting a suitable chuck and maintaining it properly is particularly important in machining.

[0003] For example, patent number CN 213496568 U relates to a clamping chuck. An automatic centering three-jaw chuck includes a chuck body and a drive disc mounted within the chuck body. Several movable clamping parts are mounted within the chuck body, each with a guide thread formed at its rear end. The bottom of the drive disc has a helical groove that mates with the guide thread. A rotating shaft and planetary gears meshing with the rotating shaft are mounted on the drive disc. A rim fixed to the chuck body surrounds the planetary gears. The rotating shaft drives the planetary gears to rotate within the rim, which in turn drives the drive disc to rotate. The drive disc then moves the clamping parts back and forth. By driving the rotating shaft to rotate the planetary gears, which in turn drives the drive disc to rotate, the three jaws simultaneously clamp the shaft parts, ensuring their concentricity, reducing runout errors, and achieving high-precision centering clamping. This solves the problem of low machining accuracy caused by unstable clamping in three-jaw chucks.

[0004] For example, patent number CN 215144795 U relates to an automatic opening and closing self-centering six-jaw chuck mechanism, including a chuck platform plate and a telescopic cylinder. The bottom end of the chuck platform plate is equipped with a chuck base, a slewing support bearing, a six-gear transmission mechanism, and a first support seat. The outer gear ring of the slewing support bearing meshes with the driven gear in the gear transmission mechanism. The top end of the chuck platform plate is equipped with a jaw mechanism, and the rack in the jaw mechanism meshes with the drive gear in the gear transmission mechanism. A rotating plate is installed at the bottom end of the outer ring of the slewing support bearing, and a second support seat is installed at the bottom end of the rotating plate. The front end of the telescopic cylinder is hinged to the second support seat, and the rear end of the telescopic cylinder is hinged to the first support seat. The beneficial effect is that a single driving device drives six jaws to move simultaneously, achieving automatic opening and closing and self-centering functions, ensuring the synchronicity of the movement of the six jaws, and meeting the requirements for high-precision automated workpiece clamping.

[0005] While the two patents mentioned above offer certain advantages in achieving automatic centering, their centering adjustment range and automation adaptability remain limited. For example, neither patent's clamping plate can automatically grip the bar stock, requiring manual adjustment when dealing with bars of different diameters, thus affecting processing efficiency. Furthermore, the lack of adjustment for bar stock eccentricity prevents the processing of irregular shafts such as crankshafts, further restricting the processing range. Summary of the Invention

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an automatic centering chuck for multi-specification bar stock and its usage method. This solves the problems of the aforementioned automatic centering chucks requiring manual adjustment of the clamping plates when dealing with bar stock of different diameters, being unable to automatically clamp the bar stock, and lacking the function of adjusting the eccentric position of the bar stock, which leads to low processing efficiency and limited processing range.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: an automatic centering chuck for multi-specification bar stock and its method of use, comprising a mounting frame, wherein the mounting frame is provided with a rotating eccentric mechanism, the rotating eccentric mechanism is connected to an automatic centering chuck, the automatic centering chuck is provided with a protective shell, the front end face of the protective shell is provided with three centering sliders, the rear end of the centering sliders is provided with a centering block, the centering block is connected to a centering ring, the centering ring is placed inside a rotating centering disk, and the automatic centering ring is connected to the rear of the rotating centering disk. The device is equipped with three spring connecting seats, each connected to a tension spring. The inner ring of the protective shell is connected to three spring fixing seats, each connected to the other end of a tension spring. A rotary control disk is connected to the rear of the automatic centering ring, and the rotary control disk is connected to three rotary control fixing frames. A cover plate is provided at the rear end of the protective shell. A connecting rod is provided in the middle of the protective shell, and a fixing nut is provided at the rear end of the connecting rod to connect it to the cover plate. A fixing ring is provided at the rear end of each rotary control fixing frame, passing through the cover plate, to fix the position of the centering slider.

[0008] Preferably, a connecting plate is connected to the front end of the centering slider, and a clamping plate is provided below the connecting plate.

[0009] Preferably, the rotary eccentric mechanism is provided with a movable disk, which is connected to the cover plate. A worm sleeve is provided behind the movable disk, and a worm is connected to the worm sleeve. The worm is placed inside the rotary disk.

[0010] Preferably, the rear end of the rotating disk is connected to an inner bearing ring, the outer side of the inner bearing ring is connected to 22 rollers, the outer side of the rollers is connected to an outer bearing ring, a cage is provided between the rollers, and a rotating spindle is provided inside the inner bearing ring.

[0011] Preferably, the mounting bracket is provided with a frame, the upper part of which is connected to the outer ring of the bearing, and a motor is provided at the rear of the frame. The motor is connected to a drive pulley, the drive pulley is connected to a transmission belt, and the other end of the transmission belt is connected to a driven pulley, which is connected to the rotating main shaft.

[0012] Preferably, the front end of the frame is provided with a sliding groove, the sliding groove is connected to a movable frame, the upper end of the movable frame is provided with a bar top rod, and the lower left and right sides of the movable frame are provided with fixing bolts. The frame can be equipped with a tool feed post according to the user's needs.

[0013] Preferably, the equipment is specifically designed for the electric vehicle manufacturing industry and is capable of producing various types of shaft parts efficiently and precisely. It possesses superior processing capabilities, meeting the high-quality requirements of key components in electric vehicles and providing a reliable guarantee for the overall manufacturing of electric vehicles.

[0014] A method for using a multi-specification bar stock automatic centering chuck, including the aforementioned multi-specification bar stock automatic centering chuck, is as follows: Step S1: First, insert a tool into the adjustment hole above the rotary control mounting bracket and rotate the rotary control disk clockwise. At this time, the rotary control disk drives the automatic centering ring to rotate synchronously. Since the automatic centering ring is connected to the rotary centering disk, the rotary centering disk rotates accordingly. Under the action of the arc groove of the rotary centering disk, the centering ring inside drives the centering block and the centering slider to move outward along the radial groove of the protective shell, thereby increasing the distance between the three clamping plates to allow the bar stock to be processed to be placed in.

[0015] Step S2: Place one end of the bar stock between the three clamping plates, then loosen the connection between the tool and the rotary control fixing frame. Since the two ends of the tension spring are respectively connected to the spring connecting seat of the automatic centering ring and the spring fixing seat of the inner ring of the protective shell, the automatic centering ring will drive the rotary centering disk to rotate in the opposite direction under the action of the tension spring's rebound force. The reverse rotation of the rotary centering disk causes the centering ring inside it to pull the centering block and centering slider towards the center under the action of the arc-shaped inclined groove, thereby driving the three clamping plates to move synchronously towards the center until they tightly hold the bar stock, achieving automatic centering and clamping of the bar stock.

[0016] Step S3: By rotating the control frame, the rear end passes through the fixing ring set on the cover plate, which can stably fix the position of the centering slider, ensuring that the clamping force of the clamping plate on the bar stock remains stable during the processing, and preventing the bar stock from shifting during processing. The other end is supported by the bar stock push rod on the moving frame. According to the length of the bar stock, loosen the fixing bolts under the moving frame, adjust the moving frame to the appropriate position along the slide groove at the front end of the frame, and then tighten the fixing bolts again to fix it.

[0017] Step S4: If eccentric machining of the bar stock is required, the worm gear is driven to rotate by an external control device. The worm gear meshes with the worm sleeve, causing the worm sleeve and the connected moving disc to move eccentrically. Since the moving disc is connected to the cover plate of the automatic centering chuck, the automatic centering chuck as a whole adjusts its eccentric position along with the moving disc.

[0018] Step S5: The motor starts, driving the drive pulley to rotate. The drive pulley drives the driven pulley to rotate via the transmission belt, which in turn drives the rotary spindle to rotate. The rotary spindle drives the rotary disk to rotate through a bearing structure consisting of an inner bearing ring, rollers, and an outer bearing ring. The rotary disk then transmits the rotational power to the automatic centering chuck through components such as the moving disc and cover plate of the rotary eccentric mechanism, causing the clamped bar stock to rotate together with the automatic centering chuck, thereby cooperating with the tool post to complete eccentric machining or conventional coaxial machining.

[0019] (III) Beneficial Effects This invention provides an automatic centering chuck for multi-specification bar stock and its usage method. It has the following beneficial effects: This automated centering and clamping system for multi-specification bar stock eliminates the need for manual adjustment of the clamping plates. Through the cooperation of the centering slider, centering block, centering ring, and rotating centering disk, along with the restoring force provided by the tension spring, the centering slider automatically moves radially according to the bar stock diameter when it is placed in, achieving adaptive clamping for bars of different diameters. This effectively improves clamping efficiency and reduces manual intervention time. Furthermore, the addition of a rotary eccentric mechanism allows the chuck to not only perform conventional coaxial centering machining but also adjust the eccentric position of the automatic centering chuck, thereby meeting the machining needs of irregular shaft parts such as crankshafts and significantly expanding the equipment's processing range.

[0020] This device is based on an improvement of existing equipment, so the improvement cost is relatively low and it will not cause a large amount of existing equipment to be discarded. It ensures the processing effect while reducing the investment in improvement costs, making it suitable for large-scale production. Attached Figure Description

[0021] Figure 1 Side sectional view of an automatic centering chuck for multi-specification bar stock; Figure 2 3D model of an automatic centering chuck for multi-specification bar stock; Figure 3 BB cross-sectional view of an automatic centering chuck for multi-specification bar stock; Figure 4 CC cross-sectional view of an automatic centering chuck for multi-specification bar stock; Figure 5 DD cross-sectional view of an automatic centering chuck for multi-specification bar stock; Figure 6 EE cross-sectional view of an automatic centering chuck for multi-specification bar stock; Figure 7 FF cross-sectional view of an automatic centering chuck for multi-specification bar stock; Figure 8 This is a schematic diagram of the rotating centering disk structure; Figure 9 This is a schematic diagram of the automatic centering ring structure; Figure 10 This is a schematic diagram of the rotary control panel structure. Figure 11 This is a schematic diagram of the cover plate structure.

[0022] In the diagram: 1. Automatic centering chuck; 101. Protective shell; 102. Centering slider; 103. Centering block; 104. Rotary centering disc; 105. Centering ring; 106. Automatic centering ring; 107. Spring connecting seat; 108. Tension spring; 109. Spring fixing seat; 110. Rotary control disc; 111. Rotary control fixing frame; 112. Cover plate; 113. Connecting rod; 114. Fixing nut; 115. Connecting plate; 116. Clamp Plate; 117. Fixed ring; 2. Rotary eccentric mechanism; 21. Moving disc; 22. Worm sleeve; 23. Worm; 24. Rotary disc; 25. Inner bearing ring; 26. Roller; 27. Outer bearing ring; 28. Cage; 29. ​​Rotary spindle; 3. Mounting bracket; 31. Frame; 32. Motor; 33. Drive pulley; 34. Transmission belt; 35. Driven pulley; 36. Moving frame; 37. Bar ejector rod; 38. Fixing bolt; 39. Slide groove. Detailed Implementation

[0023] 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 embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-11This invention provides a technical solution: an automatic centering chuck for multi-specification bar stock and its usage method, comprising a mounting frame 3, wherein the mounting frame 3 is provided with a frame 31, the upper part of the frame 31 is connected to a bearing outer ring 27, a motor 32 is provided at the rear of the frame 31, the motor 32 is connected to a drive pulley 33, the drive pulley 33 is connected to a transmission belt 34, the other end of the transmission belt 34 is connected to a driven pulley 35, the driven pulley 35 is connected to a rotating main shaft 29, a sliding groove 39 is provided at the front end of the frame 31, the sliding groove 39 is connected to a moving frame 36, a bar stock push rod 37 is provided at the upper end of the moving frame 36, and the lower left and right sides of the moving frame 36 are provided with The frame 31 is equipped with fixing bolts 38. A tool feed post can be added to the frame 31 according to user needs. The mounting frame 3 is equipped with a rotary eccentric mechanism 2, which includes a movable disk 21 connected to a cover plate 112. A worm sleeve 22 is located behind the movable disk 21, and a worm 23 is connected to the worm sleeve 22. The worm 23 is housed within a rotating disk 24. A bearing inner ring 25 is connected to the rear end of the rotating disk 24. Twenty-two rollers 26 are connected to the outer side of the bearing inner ring 25, and an outer bearing ring 27 is connected to the outer side of each roller. A retainer 28 is provided between the rollers 26. A rotating spindle 29 is located inside the bearing inner ring 25. The rotary eccentric mechanism 2 is connected to an automatic centering chuck 1. The automatic centering chuck 1 is equipped with a protective shell 101. Three centering sliders 102 are provided on the front end face of the protective shell 101. A connecting plate 115 is connected to the front end of each centering slider 102. A clamping plate 116 is provided below the connecting plate 115. A centering block 103 is provided at the rear end of each centering slider 102. A centering ring 105 is connected to the centering block 103. The centering ring 105 is placed inside a rotary centering disk 104. An automatic centering ring 106 is connected to the rear of the rotary centering disk 104. The automatic centering ring 106 is equipped with three spring connecting seats 107. The spring connecting seats 107 are connected to... The device includes a tension spring 108. Three spring fixing seats 109 are connected to the inner ring of the protective shell 101. Each spring fixing seat 109 is connected to the other end of the tension spring 108. A rotary control disk 110 is connected to the rear of the automatic centering ring 106. Three rotary control fixing brackets 111 are connected to the rotary control disk 110. A cover plate 112 is provided at the rear end of the protective shell 101. A connecting rod 113 is provided in the middle of the protective shell 101. A fixing nut 114 is provided at the rear end of the connecting rod 113 to connect with the cover plate 112. A fixing ring 117 is provided at the rear end of the rotary control fixing bracket 111, passing through the cover plate 112, to fix the position of the centering slider 102. This equipment is specifically designed for the electric vehicle manufacturing field and can efficiently and accurately produce various shaft parts. It possesses excellent processing capabilities, meeting the high-quality requirements of key components for electric vehicles and providing a reliable guarantee for the overall manufacturing of electric vehicles.

[0025] A method for using a multi-specification bar stock automatic centering chuck, including the aforementioned multi-specification bar stock automatic centering chuck, is as follows: Step S1: First, insert a tool into the adjustment hole above the rotary control fixing frame 111, and rotate the rotary control disk 110 clockwise. At this time, the rotary control disk 110 drives the automatic centering ring 106 to rotate synchronously. Since the automatic centering ring 106 is connected to the rotary centering disk 104, the rotary centering disk 104 rotates accordingly. Under the action of the arc-shaped inclined groove of the rotary centering disk 104, the centering ring 105 inside it drives the centering block 103 and the centering slider 102 to move outward along the radial groove of the protective shell 101, thereby increasing the distance between the three clamping plates 116 so as to put in the bar stock to be processed.

[0026] Step S2: Place one end of the bar stock between the three clamping plates 116, then loosen the connection between the tool and the rotation control fixing frame 111. Since the two ends of the tension spring 108 are respectively connected to the spring connecting seat 107 of the automatic centering ring 106 and the spring fixing seat 109 of the inner ring of the protective shell 101, under the action of the rebound force of the tension spring 108, the automatic centering ring 106 will drive the rotating centering disk 104 to rotate in the opposite direction. The reverse rotation of the rotating centering disk 104 causes the centering ring 105 inside it to pull the centering block 103 and the centering slider 102 towards the center under the action of the arc inclined groove, thereby driving the three clamping plates 116 to move towards the center synchronously until they tightly hold the bar stock, realizing the automatic centering and clamping of the bar stock.

[0027] Step S3: By rotating the control frame 111, the rear end of the fixed frame 111 passes through the fixed ring 117 set in the cover plate 112, the position of the centering slider 102 can be firmly fixed, ensuring that the clamping force of the clamping plate 116 on the bar stock remains stable during the processing, preventing the bar stock from shifting during processing. The other end is supported by the bar stock push rod 37 on the moving frame 36. According to the length of the bar stock, loosen the fixing bolt 38 below the moving frame 36, adjust the moving frame 36 to a suitable position along the slide groove 39 at the front end of the frame 31, and then tighten the fixing bolt 38 to fix it.

[0028] Step S4: If eccentric machining of the bar stock is required, the worm 23 is driven to rotate by an external control device. The worm 23 meshes with the worm sleeve 22, causing the worm sleeve 22 and the connected moving disk 21 to move eccentrically. Since the moving disk 21 is connected to the cover plate 112 of the automatic centering chuck 1, the automatic centering chuck 1 as a whole adjusts its eccentric position along with the moving disk 21.

[0029] Step S5: The motor 32 starts, driving the drive pulley 33 to rotate. The drive pulley 33 drives the driven pulley 35 to rotate via the transmission belt 34, which in turn drives the rotating spindle 29 to rotate. The rotating spindle 29 drives the rotating disk 24 to rotate via a bearing structure composed of the inner bearing ring 25, roller 26, and outer bearing ring 27. The rotating disk 24 then transmits the rotational power to the automatic centering chuck 1 via the moving disk 21 and cover plate 112 of the rotating eccentric mechanism 2, so that the clamped bar stock rotates together with the automatic centering chuck 1, thereby cooperating with the feed post to complete eccentric machining or conventional coaxial machining.

[0030] In summary, this automated centering and clamping system for multi-specification bar stock eliminates the need for manual adjustment of the clamping plates. Through the cooperation of the centering slider, centering block, centering ring, and rotating centering disk, along with the restoring force provided by the tension spring, the centering slider automatically moves radially according to the bar stock diameter when it is placed in, achieving adaptive clamping for bars of different diameters. This effectively improves clamping efficiency and reduces manual intervention time. Furthermore, the addition of a rotary eccentric mechanism allows the chuck to not only perform conventional coaxial centering machining but also adjust the eccentric position of the automatic centering chuck, thereby meeting the machining needs of irregular shaft parts such as crankshafts and significantly expanding the equipment's processing range.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic centering chuck for multi-specification bar stock, comprising a mounting frame (3), wherein the mounting frame (3) is provided with a rotary eccentric mechanism (2), and the rotary eccentric mechanism (2) is connected to an automatic centering chuck (1), characterized in that: The automatic centering chuck (1) is provided with a protective shell (101). Three centering sliders (102) are provided on the front end of the protective shell (101). A centering block (103) is provided at the rear end of each centering slider (102). A centering ring (105) is connected to the centering block (103). The centering ring (105) is placed inside a rotating centering disk (104). An automatic centering ring (106) is connected to the rear of the rotating centering disk (104). The automatic centering ring (106) is provided with three spring connecting seats (107). Tension springs (108) are connected to the spring connecting seats (107). Three spring fixing seats (108) are connected to the inner ring of the protective shell (101). 9) The spring fixing seat (109) is connected to the other end of the tension spring (108). The automatic centering ring (106) is connected to a rotary control disk (110). The rotary control disk (110) is connected to three rotary control fixing brackets (111). The protective shell (101) is provided with a cover plate (112) at the rear end. The protective shell (101) is provided with a connecting rod (113) in the middle. The connecting rod (113) is provided with a fixing nut (114) at the rear end to achieve connection with the cover plate (112). The rotary control fixing bracket (111) is provided with a fixing ring (117) through the cover plate (112) at the rear end to achieve fixation of the centering slider (102).

2. The automatic centering chuck for multi-specification bar stock according to claim 1, characterized in that: The centering slider (102) is connected to a connecting plate (115) at its front end, and a clamping plate (116) is provided below the connecting plate (115).

3. The automatic centering chuck for multi-specification bar stock according to claim 1, characterized in that: The rotary eccentric mechanism (2) is provided with a movable disk (21), which is connected to the cover plate (112). A worm sleeve (22) is provided behind the movable disk (21), and a worm (23) is connected to the worm sleeve (22). The worm (23) is placed inside the rotary disk (24).

4. The automatic centering chuck for multi-specification bar stock according to claim 3, characterized in that: The rear end of the rotating disk (24) is connected to a bearing inner ring (25), and 22 rollers (26) are connected to the outside of the bearing inner ring (25). The outside of the rollers (26) is connected to a bearing outer ring (27). A cage (28) is provided between the rollers (26), and a rotating spindle (29) is provided inside the bearing inner ring (25).

5. The automatic centering chuck for multi-specification bar stock according to claim 1, characterized in that: The mounting bracket (3) is provided with a frame (31), the upper part of which is connected to the outer ring (27) of the bearing. A motor (32) is provided behind the frame (31), the motor (32) is connected to a drive pulley (33), the drive pulley (33) is connected to a transmission belt (34), the other end of the transmission belt (34) is connected to a driven pulley (35), and the driven pulley (35) is connected to the rotating spindle (29).

6. The automatic centering chuck for multi-specification bar stock according to claim 5, characterized in that: The frame (31) is provided with a slide groove (39) at the front end, and a movable frame (36) is connected to the slide groove (39). A bar top rod (37) is provided at the upper end of the movable frame (36), and fixing bolts (38) are provided on the left and right sides below the movable frame (36). The frame (31) can be equipped with a feed post according to the user's needs.

7. The automatic centering chuck for multi-specification bar stock according to claim 1, characterized in that: This equipment is specifically designed for the electric vehicle manufacturing industry and can efficiently and precisely produce various types of shaft parts. It possesses superior machining capabilities, meeting the high-quality requirements of key components in electric vehicles and providing a reliable guarantee for the overall manufacturing of electric vehicles.

8. A method for using an automatic centering chuck for multi-specification bar stock, characterized in that: The automatic centering chuck for multi-specification bar stock, including any one of claims 1-11, operates as follows: Step S1: First, insert a tool into the adjustment hole above the rotary control fixing frame (111) and rotate the rotary control disk (110) clockwise. At this time, the rotary control disk (110) drives the automatic centering ring (106) to rotate synchronously. Since the automatic centering ring (106) is connected to the rotary centering disk (104), the rotary centering disk (104) rotates accordingly. The centering ring (105) inside it, under the action of the arc groove of the rotary centering disk (104), drives the centering block (103) and the centering slider (102) to move outward along the radial groove of the protective shell (101), so that the distance between the three clamping plates (116) increases, so as to put the bar stock to be processed.

9. Step S2: Place one end of the bar stock between the three clamping plates (116), and then loosen the connection between the tool and the rotation control fixing frame (111). Since the two ends of the tension spring (108) are respectively connected to the spring connecting seat (107) of the automatic centering ring (106) and the spring fixing seat (109) of the inner ring of the protective shell (101), under the action of the rebound force of the tension spring (108), the automatic centering ring (106) will drive the rotating centering disk (104) to rotate in the opposite direction. The reverse rotation of the rotating centering disk (104) causes the centering ring (105) inside it to pull the centering block (103) and the centering slider (102) towards the center under the action of the arc inclined groove, thereby driving the three clamping plates (116) to move towards the center synchronously until they tightly hold the bar stock, thus realizing the automatic centering and clamping of the bar stock.

10. Step S3: By rotating the control frame (111) through the fixing ring (117) set in the cover plate (112), the position of the centering slider (102) can be fixed in place, ensuring that the clamping force of the clamping plate (116) on the bar stock remains stable during the processing, preventing the bar stock from shifting during processing. The other end is supported by the bar stock push rod (37) on the moving frame (36). According to the length of the bar stock, loosen the fixing bolt (38) below the moving frame (36), adjust the moving frame (36) to a suitable position along the slide groove (39) at the front end of the frame (31), and then tighten the fixing bolt (38) again to fix it.

11. Step S4; If eccentric machining of the bar stock is required, the worm (23) is driven to rotate by an external control device. The worm (23) meshes with the worm sleeve (22), driving the worm sleeve (22) and the moving disk (21) connected to it to move eccentrically. Since the moving disk (21) is connected to the cover plate (112) of the automatic centering chuck (1), the automatic centering chuck (1) as a whole adjusts its eccentric position with the moving disk (21).

12. Step S5; The motor (32) starts, driving the drive pulley (33) to rotate. The drive pulley (33) drives the driven pulley (35) to rotate through the transmission belt (34), thereby driving the rotating spindle (29) to rotate. The rotating spindle (29) drives the rotating disk (24) to rotate through the bearing structure composed of the inner bearing ring (25), roller (26) and outer bearing ring (27). The rotating disk (24) then transmits the rotational power to the automatic centering chuck (1) through the moving disk (21) and cover plate (112) of the rotating eccentric mechanism (2), so that the clamped bar rotates together with the automatic centering chuck (1), thereby cooperating with the feed post to complete eccentric machining or conventional coaxial machining.

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