An auxiliary tool for machining eccentric shaft workpieces

Abstract

This utility model discloses an auxiliary tooling for machining eccentric shaft-type workpieces, used to adjust and orient the position of the eccentric shaft-type workpiece on a machine tool spindle. It includes: a locking assembly, mounted on the machine tool spindle and located on one side of the spindle, detachably connected to the spindle; and a chuck assembly, mounted on the locking assembly and detachably connected to it. The workpiece is clamped in the clamping cavity formed by the chuck assembly. The chuck assembly limits the radial displacement of the workpiece along the machine tool spindle. The locking assembly retracts the chuck assembly to clamp the workpiece. The eccentricity angle of the chuck assembly cancels out the eccentricity angle of the workpiece, initially clamping the workpiece to ensure accurate identification of its eccentric position, allowing it to rotate in a normal state. The locking assembly then retracts the chuck assembly to clamp the workpiece, ensuring machining accuracy and significantly reducing the time spent finding specific positions when machining such eccentric shaft-type workpieces.

Description

Technical Field

[0001] This utility model relates to the field of machining eccentric shaft workpieces, and in particular to an auxiliary tooling for machining eccentric shaft workpieces. Background Technology

[0002] An eccentric shaft is a workpiece in which the outer circle is parallel to but does not coincide with the axis of the central shaft. The distance between the outer circle and the axis of the central shaft is called the eccentricity.

[0003] For CNC machine tools, machining this workpiece requires mounting it on the machine spindle using a fixture. During this mounting process, a specific eccentric position needs to be found on the workpiece. The process involves first adjusting the chuck jaws, then using a dial indicator to find the specific position where the workpiece is in rotational equilibrium on the machine spindle. This balance process allows for proper mounting of the workpiece in that specific position. However, the dial indicator process requires constant adjustments, making it complex and time-consuming. It involves considering various factors, making it difficult to accurately mount the workpiece at the required eccentric position and ensuring machining accuracy.

[0004] Furthermore, since the eccentricity of the two outer circles of the eccentric shaft workpiece is required to differ by 180°, the above processing steps need to be repeated, and it is difficult to guarantee that the eccentricity difference is 180°. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides an auxiliary tooling for machining eccentric shaft workpieces, which adjusts the eccentric position of the workpiece by driving the chuck assembly to move through the locking assembly.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] An auxiliary tooling for machining eccentric shaft-type workpieces includes:

[0008] The locking assembly is mounted on the machine tool spindle, located on one side of the machine tool spindle, and is detachably connected to the machine tool spindle.

[0009] The chuck assembly is mounted on the locking assembly and is detachably connected to the locking assembly. The workpiece is clamped in the clamping cavity formed by the chuck assembly. The chuck assembly is used to limit the workpiece's deviation displacement along the radial direction of the machine tool spindle. The locking assembly is used to drive the chuck assembly to retract through an action to clamp the workpiece.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] The workpiece is clamped in the chuck assembly. The eccentric clamping of the chuck assembly enables the machine tool to machine an eccentric wheel and keeps the workpiece in a balanced state during rotation. Then, the locking assembly drives the chuck assembly to retract and clamp the workpiece. This directly eliminates the trouble of using a dial indicator to find a specific position, ensuring the machining accuracy of the workpiece and greatly reducing the time spent finding a specific position before machining such eccentric shaft workpieces.

[0012] More preferably, the locking assembly includes:

[0013] The locking flange is mounted on the machine tool spindle, with one side wall connected to the machine tool spindle.

[0014] The locking sleeve is located on the other side wall of the locking flange, and one side of it is detachably connected to the locking flange. The clamp assembly is embedded in the locking sleeve.

[0015] The tie rod linkage is installed on the outer wall of the machine tool tie rod, located on one side of the machine tool spindle, and is screwed to the machine tool tie rod.

[0016] The pull ring flange is located inside the locking sleeve and is coaxial with the pull rod connecting ring. There is a gap between its end face and the end face of the pull rod connecting ring. It is connected to the locking sleeve by screws, and the pull rod connecting ring is located on one side of the pull ring flange.

[0017] The clamping ring is located on the other side of the pull ring flange, with a gap between it and the flange. Its inner wall at the end is fitted to the clamping assembly. The clamping ring and the pull rod move synchronously in a linked manner.

[0018] Using the above technical solution, the pull rod link, pull ring flange, and chuck pull ring are installed in the locking sleeve. The chuck pull ring is installed together with the chuck assembly. The action of the locking assembly drives the action of the chuck assembly, thereby achieving the purpose of clamping or releasing the workpiece.

[0019] More preferably, the locking assembly further includes:

[0020] The connecting column slides through the pull ring flange and connects to the tie rod link and the clamp pull ring respectively.

[0021] A positioning plate is formed on the pull ring flange, and a positioning pin is connected to the positioning plate. The positioning pin is located between the positioning plate and the chuck assembly and is adapted to the positioning plate. The positioning pin is used to limit the clamping depth of the workpiece in the chuck assembly.

[0022] Using the above technical solution, the connecting column connects the tie rod link, the pull ring flange, and the chuck pull ring together. When the machine tool tie rod moves, the tie rod link moves along with the machine tool tie rod and drives the connecting column to move. The connecting column drives the chuck pull ring to move in the same direction, realizing a linkage action. The positioning plate is installed together with the positioning column. The positioning column forms an abutment relationship with the workpiece, thereby limiting the position of the workpiece within the chuck assembly and ensuring the clamping depth of the workpiece within the chuck assembly.

[0023] More preferably, the chuck assembly includes:

[0024] A first chuck, a second chuck, and a third chuck are arranged in a ring and one end is fastened to a chuck pull ring. The first chuck, the second chuck, and the third chuck form a clamping cavity in which the workpiece is located. Driven by the chuck pull ring, the first chuck, the second chuck, and the third chuck can move closer to each other or further away to clamp or release the workpiece.

[0025] Using the above technical solution, as the first, second, and third chucks approach each other, they gradually clamp the workpiece, thus achieving workpiece installation. Conversely, as the first, second, and third chucks move away from each other, they gradually release the workpiece, thus achieving workpiece disassembly.

[0026] Further optimization involves having the first and second chucks have the same structure, while the third chuck has a different structure from both the first and second chucks.

[0027] Using the above technical solution, after the first chuck, the second chuck and the third chuck hold the workpiece, the third chuck will limit the workpiece to a specific position to ensure that the eccentric wheel can be successfully machined.

[0028] Further optimization includes the following on the third chuck:

[0029] The screw hole is a through hole that passes through the locking sleeve and the third chuck in sequence, and is perpendicular to the axis of the workpiece.

[0030] The set screw is located inside the screw hole, and its working end passes through the screw hole and abuts against the roller tooth groove on the workpiece to define the position of the workpiece.

[0031] The spring is mounted on the set screw and located inside the screw hole, with its bottom end abutting against the set screw.

[0032] The clamping screw, located in the screw hole, abuts against the top of the spring and is used to rotate within the screw hole to clamp or release the spring.

[0033] Using the above technical solution, the clamping screw compresses the spring by rotating inside the screw hole. After the spring is compressed, it pushes the set screw toward the end of the screw hole. The end of the set screw passes through the bottom of the screw hole and is inserted into the roller tooth groove, preventing the workpiece from rotating inside the chuck assembly. This serves to limit the position and thus confine the workpiece to a specific position in a balanced state.

[0034] Further optimization involves the following openings within the locking sleeve:

[0035] The first locking cavity corresponds to the position of the chuck assembly, and its inner wall is in contact with the side wall of the first chuck, the side wall of the second chuck, and the side wall of the third chuck.

[0036] The second locking cavity is located in the middle area of ​​the locking sleeve, communicates with the first locking cavity, and is connected to the collet pull ring by screws.

[0037] The third locking chamber is connected to the second locking chamber, is adapted to the pull ring flange, and is connected to the locking flange by screws.

[0038] By adopting the above technical solution, the chuck assembly, chuck pull ring, and pull ring flange are locked on the locking sleeve to prevent them from moving freely. Then, the locking sleeve connects the frame assembly, pull ring flange, and chuck pull ring to the machine tool spindle, so as to perform the purpose of clamping or releasing the workpiece along with the machine tool spindle.

[0039] Further optimization involves grooves being provided at the base of the first, second, and third clamps, which are then engaged with the locking sleeve.

[0040] By adopting the above technical solution, the first chuck, the second chuck, and the third chuck can move on the locking sleeve to adjust the position of the workpiece in the cavity and find a specific position where the workpiece is in a balanced state.

[0041] Further optimization involves providing flat grooves on the side walls of both the first and second chucks.

[0042] By adopting the above technical solution, the sidewalls of the first chuck and the second chuck are made to directly contact the guide screw through a certain plane, so that the first chuck and the second chuck can move within a certain range within the locking sleeve.

[0043] A further preferred embodiment includes an error-proof pressure cover with an error-proof hole; the error-proof pressure cover is located upstream of the chuck assembly and is connected to the locking sleeve on the locking assembly by screws.

[0044] Using the above technical solution, when clamping the workpiece on the second machine tool, after the anti-misalignment cover and locking sleeve are connected by screws, the workpiece passes through the anti-misalignment hole and contacts the positioning pin in the clamping cavity. The anti-misalignment hole ensures that the workpiece can be fully inserted into the clamping cavity within the eccentricity range, and also ensures that the included angle between the two eccentric wheels after machining is 180°. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of this embodiment.

[0046] Figure 2 This is a schematic diagram of the internal structure of this embodiment.

[0047] Figure 3 This is a schematic diagram of the anti-misoperation cover in this embodiment.

[0048] Figure 4 This is a schematic diagram of the locking sleeve in this embodiment.

[0049] Figure 5 This is a partial structural diagram of this embodiment.

[0050] Figure 6 This is a schematic diagram of the cross-sectional structure in this embodiment.

[0051] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0052] Figure 8 This is a schematic diagram of the positioning column in this embodiment.

[0053] Figure 9 This is a schematic diagram of the linkage structure of the tie rod in this embodiment.

[0054] Figure 10 This is a schematic diagram of the trench structure in this embodiment.

[0055] Figure 11 This is a cross-sectional structural diagram of the connection between the locking flange and the screw in this embodiment.

[0056] Figure 12 This is a schematic cross-sectional view of the sleeve in this embodiment.

[0057] Figure 13 This is a schematic diagram of the structure of the first clamp, the second clamp, and the third clamp in this embodiment.

[0058] Figure 14 This is a schematic diagram of the workpiece before and after processing in this embodiment.

[0059] Figure reference numerals: 1-Chuck assembly; 10-Anti-misalignment cover; 100-Anti-misalignment hole; 101-Snap groove; 11-First chuck; 12-Second chuck; 13-Third chuck; 130-Groove; 131-Screw hole; 132-Setting screw; 133-Spring; 134-Clamping screw; 135-Flat groove; 14-Guide screw; 2-Machine tool tie rod; 3-Machine tool spindle; 4-Locking assembly; 40-Sleeve; 41-Locking method 42-Locking sleeve; 421-First locking cavity; 422-Second locking cavity; 423-Third locking cavity; 43-Pull rod link; 44-Pull ring flange; 45-Clamping pull ring; 46-Connecting column; 47-Positioning column; 48-Positioning disc; 5-Workpiece; 51-Roller tooth groove; 502-Central shaft; 5021-First outer circle; 5022-Second outer circle; 503-First eccentric wheel; 504-Second eccentric wheel. Detailed Implementation

[0060] The following is in conjunction with the appendix Figures 1-14 This utility model will be described in further detail.

[0061] For ease of description, this embodiment first introduces the state of the eccentric shaft workpiece (hereinafter referred to as workpiece 5) before and after machining, such as... Figure 14 The state of workpiece 5 before processing is shown in Figure a. Figure 14 The workpiece 5 shown in b has been processed into a central shaft 502 with a roller tooth groove 51 at one end, and a first outer circle 5021 and a second outer circle 5022 that are co-centered with the central shaft 502 and spaced apart. After processing, the first outer circle 5021 and the second outer circle 5022 respectively form a first eccentric wheel 503 and a second eccentric wheel 504. At this time, the eccentricity of the first eccentric wheel 503 and the second eccentric wheel 504 relative to the central shaft 502 is opposite, that is, the eccentricity of the first eccentric wheel 503 and the second eccentric wheel 504 is 180° apart.

[0062] An auxiliary tooling for machining eccentric shaft-type workpieces 5, such as Figure 1 As shown, it includes:

[0063] The locking assembly 4 is mounted on the machine tool spindle 3, located on one side of the machine tool spindle 3, and is detachably connected to the machine tool spindle 3.

[0064] The chuck assembly 1 is mounted on the locking assembly 4 and is detachably connected to the locking assembly 4. The workpiece 5 is clamped in the clamping cavity formed by the chuck assembly 1. The chuck assembly 1 is used to limit the deviation displacement of the workpiece 5 along the radial direction of the machine tool spindle. The locking assembly 4 is used to drive the chuck assembly 1 to retract through an action to clamp the workpiece 5.

[0065] The workpiece 5 is clamped in the chuck assembly 1. The eccentric clamping of the chuck assembly 1 enables the machine tool to machine an eccentric wheel and keeps the workpiece 5 in a balanced state during rotation. Then, the locking assembly 4 drives the chuck assembly 1 to retract and clamp the workpiece 5. This directly eliminates the trouble of using a dial indicator to find a specific position, ensuring the machining accuracy of the workpiece 5 and greatly reducing the time spent finding a specific position before machining this type of eccentric shaft workpiece 5.

[0066] Specifically, such as Figure 1 , Figure 2 , Figure 5 as well as Figure 11 As shown, the locking component 4 in this embodiment includes:

[0067] Locking flange 41 is mounted on machine tool spindle 3, and one side wall of it is connected to machine tool spindle 3.

[0068] The locking sleeve 42 is located on the other side wall of the locking flange 41, and one side of it is detachably connected to the locking flange 41. The clamp assembly 1 is embedded in the locking sleeve 42.

[0069] The tie rod link 43 is set on the outer wall of the machine tool tie rod 2, located on one side of the machine tool spindle 3, and is screwed to the machine tool tie rod 2.

[0070] The pull ring flange 44 is located inside the locking sleeve 42 and is coaxial with the pull rod connecting ring 43. There is a gap between its end face and the end face of the pull rod connecting ring 43. It is connected to the locking sleeve 42 by screws 49. The pull rod connecting ring 43 is located on one side of the pull ring flange 44. Specifically: Figure 11 As shown, screw 49 is mounted on pull ring flange 44, and its end passes through pull ring flange 44 and is screwed into locking sleeve 42, thereby fixing pull ring flange 44 inside locking sleeve 42.

[0071] The clamping ring 45 is located on the other side of the ring flange 44 and there is a gap between it and the ring flange 44. Its end inner wall is connected to the clamping assembly 1. The clamping ring 45 moves synchronously with the pull rod link 43.

[0072] The pull rod link 43, the pull ring flange 44, and the chuck pull ring 45 are installed in the locking sleeve 42. The chuck pull ring 45 is installed together with the chuck assembly 1. The action of the locking assembly 4 drives the action of the chuck assembly 1, thereby achieving the purpose of clamping or releasing the workpiece 5.

[0073] Specifically, such as Figure 6 , Figure 8 , Figure 9 as well as Figure 12 As shown, the locking component 4 in this embodiment further includes:

[0074] The connecting column 46 slides through the pull ring flange 44 and is connected to the pull rod link 43 and the clamp pull ring 45 respectively.

[0075] A positioning plate 48 is formed on the pull ring flange 44, and a positioning pin 47 is connected to the positioning plate 48. The positioning pin 47 is located between the positioning plate 48 and the chuck assembly 1 and is adapted to the positioning plate 48. The positioning pin 47 is used to limit the clamping depth of the workpiece 5 in the chuck assembly 1.

[0076] The connecting column 46 connects the tie rod link 43, the pull ring flange 44, and the chuck pull ring 45 together. When the machine tool tie rod 2 moves, the tie rod link 43 moves along with the machine tool tie rod 2 and drives the connecting column 46 to move. The connecting column 46 drives the chuck pull ring 45 to move in the same direction, realizing a linkage action. The positioning plate 48 is installed together with the positioning column 47. The positioning column 47 forms an abutment relationship with the workpiece 5, thereby limiting the position of the workpiece 5 in the chuck assembly 1, thus ensuring the clamping depth of the workpiece 5 in the chuck assembly 1.

[0077] The connection method between the connecting post 46, the pull rod link 43, and the clamp pull ring 45 can be as follows: Figure 6 and Figure 12As shown, the locking assembly 4 also includes a sleeve 40 sleeved outside the connecting post 46. The length of the sleeve 40 is greater than the thickness of the pull ring flange 44, and it slides out of the pull ring flange 44. The connecting post 46 passes through the rear end of the sleeve 40 and is threadedly connected to the collet pull ring 45, so that both ends of the sleeve 40 provide support for the collet pull ring 45 and the pull rod link 43 respectively, connecting the collet pull ring 45, the pull rod link 43 and the connecting post 46 together.

[0078] Of course, in this embodiment, it is not necessary to set up the sleeve 40. Instead, the connecting post 46 can be directly threaded to the pull rod ring 43 and the clamp ring 45 respectively, which can also achieve relative fixation of the clamp ring 45, the pull rod ring 43 and the connecting post 46.

[0079] like Figure 1 , Figure 3 , Figure 5 , Figure 6 as well as Figure 7 As shown, the chuck assembly 1 in this embodiment includes a first chuck 11, a second chuck 12, and a third chuck 13 arranged in a ring and fastened at one end to a chuck pull ring 45. The first chuck 11, the second chuck 12, and the third chuck 13 form a clamping cavity, in which the workpiece 5 is located. Driven by the chuck pull ring 45, the first chuck 11, the second chuck 12, and the third chuck 13 can move closer to or further away from each other to clamp or release the workpiece 5.

[0080] As the first chuck 11, the second chuck 12, and the third chuck 13 approach each other, they gradually clamp the workpiece 5, thus achieving the installation of the workpiece 5. Conversely, as the first chuck 11, the second chuck 12, and the third chuck 13 move away from each other, they gradually release the workpiece 5, thus achieving the disassembly of the workpiece 5.

[0081] Specifically, such as Figure 5 and Figure 13 As shown, in this embodiment, the first chuck 11 and the second chuck 12 have the same structure, while the third chuck 13 has a different structure from the first chuck 11 and the second chuck 12. The first chuck 11, the second chuck 12, and the third chuck 13 are pre-milled with a certain eccentric angle, so that the center line of the clamping cavity formed by the clamping surfaces of the third chuck 13, the first chuck 11, and the second chuck 12 is not coaxial with the axis of the machine tool spindle 3, thus forming an eccentric angle. When clamping the workpiece 5, this eccentric angle cancels out the eccentric angle of the workpiece 5 itself, so that the eccentric shaft-type workpiece 5 is clamped on this fixture in a normal balanced rotational state.

[0082] In addition, to facilitate the assembly of the chuck assembly and the locking assembly, in this embodiment, guide screws 14 are screwed onto the locking sleeve 42 corresponding to the first chuck 11 and the second chuck 12. The guide screws 14 pass through the inside of the locking sleeve 42 and have flat grooves 135 on both the first chuck 11 and the second chuck 12. The guide screws 14 and flat grooves 135 abut against each other, thereby guiding the installation of the first chuck 11 and the second chuck 12.

[0083] On the second machine tool, after the first chuck 11, the second chuck 12 and the third chuck 13 clamp the workpiece 5, the third chuck 13 limits the workpiece 5 to a specific position to ensure that the eccentric wheel can be successfully machined.

[0084] Specifically, such as Figure 7 As shown, the third chuck 13 in this embodiment is provided with:

[0085] The screw hole 131 is a through hole that passes through the locking sleeve 42 and the third chuck 13 in sequence, and is perpendicular to the axis of the workpiece 5.

[0086] The set screw 132 is set in the screw hole 131, and its working end passes through the screw hole 131 and abuts against the roller tooth groove 51 on the workpiece 5 to limit the position of the workpiece 5.

[0087] Spring 133 is mounted on set screw 132 and located inside screw hole 131, with its bottom end abutting against set screw 132.

[0088] A clamping screw 134 is disposed in a screw hole 131 and abuts against the top of a spring 133. It is used to rotate in the screw hole 131 to clamp or release the spring 133.

[0089] The clamping screw 134 compresses the spring 133 by rotating within the screw hole 131. After being compressed, the spring 133 pushes the set screw 132 toward the end of the screw hole 131. The end of the set screw 132 passes through the bottom of the screw hole 131 and is inserted into the roller tooth groove 51, preventing the workpiece 5 from rotating within the chuck assembly 1, thus limiting its position and thereby confining the workpiece 5 to a specific position in a balanced state.

[0090] Specifically, such as Figure 1 and Figure 4 As shown, in this embodiment, the locking sleeve 42 has the following openings:

[0091] The first locking cavity 421 corresponds to the position of the chuck assembly 1, and its inner wall is in contact with the side wall of the first chuck 11, the side wall of the second chuck 12 and the side wall of the third chuck 13.

[0092] The second locking cavity 422 is located in the middle region of the locking sleeve 42, communicates with the first locking cavity 421, and is connected to the clamp pull ring 45 by screws.

[0093] The third locking cavity 423 communicates with the second locking cavity 422, is adapted to the pull ring flange 44, and is connected to the locking flange 41 by the through screw 49.

[0094] The chuck assembly 1, chuck pull ring 45, and pull ring flange 44 are locked onto the locking sleeve 42 to prevent them from moving freely. Then, the frame assembly, pull ring flange 44, and chuck pull ring 45 are connected to the machine tool spindle 3 through the locking sleeve 42, so as to perform the purpose of clamping or releasing the workpiece 5 along with the machine tool spindle 3 changing its movements.

[0095] Specifically, such as Figure 6 and Figure 10 As shown, in this embodiment, the roots of the first chuck 11, the second chuck 12, and the third chuck 13 are all provided with grooves 130. The grooves 130 are engaged with the locking sleeve 42, so that the first chuck 11, the second chuck 12, and the third chuck 13 can move on the locking sleeve 42 to adjust the position of the workpiece 5 in the clamping cavity and find a specific position where the workpiece 5 is in a balanced state.

[0096] Combination Figures 1-12 In the machining process of the first eccentric wheel 503, firstly, the chuck pull ring 45, pull ring flange 44, and pull rod connecting ring 43 are tightened into the locking sleeve 42 with screws. The positioning pin 47 is installed into the positioning plate 48. The connecting pin 46 connects the pull rod connecting ring 43 and the chuck pull ring 45 through the pull ring flange 44. Next, the locking flange 41 is tightened onto the machine tool spindle 3 with screws. After the threads on the pull rod connecting ring 43 are tightened with the threads on the machine tool pull rod 2, the locking sleeve 42 is tightened onto the locking flange 41 with screws. Then, the set screw 132, spring 133, and spring compression screw 134 are pressed into the third chuck 13. The first chuck 11, second chuck 12, and third chuck 13 are embedded into the locking sleeve 42 through the groove 130. The workpiece 5 is loaded into the clamping cavity formed by the first chuck 11, second chuck 12, and third chuck 13 and abuts against the positioning pin 47. Rotate the spring screw 134 to compress the spring 133, so that the spring 133 pushes the set screw into the roller tooth groove 51 on the workpiece 5.

[0097] With the tooling relaxed, stepping on the machine tool pedal or clicking the control panel causes the machine tool spindle 3 to change its movement. The machine tool drawbar 2 drives the drawbar linkage 43 to move towards the machine tool spindle. The drawbar linkage 43 drives the connecting column 46 to move in the same direction, and the connecting column 46 pushes the chuck pull ring 45 to move. Driven by the chuck pull ring 45, the first chuck 11, the second chuck 12, and the third chuck 13 move closer to each other and gradually tighten until the drawbar linkage 43 is close to the pull ring flange 44, at which point the action stops. At this time, the first chuck 11, the second chuck 12, and the third chuck 13 together completely clamp the workpiece 5, completing the installation of the workpiece 5. At this time, the first outer diameter 5021 can be machined to form the first eccentric wheel 503.

[0098] Only after the first eccentric wheel 503 has been machined can the second eccentric wheel 504 be machined, such as... Figure 3 As shown, in order to ensure that the second eccentric wheel 504 is 180° away from the first eccentric wheel after processing, this embodiment also includes an anti-misalignment cover 10 with an anti-misalignment hole 100. The diameter of the anti-misalignment hole 100 is equal to the diameter of the first eccentric wheel 503, and it is set in a specific radial offset from the clamping cavity. When the workpiece 5 is inserted along the anti-misalignment hole 100, the first eccentric wheel 503 is inserted into the anti-misalignment hole 100 first. If the second eccentric wheel 504 does not meet the requirement of being 180° away from the first eccentric wheel 503 after processing, the central shaft 502 cannot be inserted into the clamping cavity. At this time, it is necessary to press and rotate the workpiece 5 at the same time until the central shaft is just inserted into the clamping hole. At this time, the second eccentric wheel 504 just meets the requirement of being 180° away from the first eccentric wheel 503 after processing.

[0099] In this embodiment, the anti-misalignment cover 10 is located upstream of the clamp assembly 1 and is connected to the locking sleeve 42 by screws. Specifically, as shown... Figure 1 and Figure 3 As shown, the inner wall of the anti-mistake cover 10 in this embodiment is provided with a snap groove 101. The anti-mistake cover 10 is pressed onto the locking sleeve 42 through the snap groove 101, and then the anti-mistake cover 10 is connected to the locking sleeve 42 by screws.

[0100] In actual processing, the first eccentric wheel 503 and the second eccentric wheel 504 can be processed sequentially on the same equipment, but the anti-error cover needs to be disassembled periodically. In order to improve processing efficiency, two equipments are usually used as a processing unit. This processing unit only needs to install the anti-error cover on one of the equipments. The process flow is as follows: the equipment without the anti-error cover processes the first eccentric wheel 503. After processing, the workpiece is disassembled. Then, the equipment with the anti-error cover is used to process the second eccentric wheel 504.

[0101] After the first eccentric wheel of workpiece 5 is machined, the workpiece 5 is removed from the chuck assembly 1 in the reverse of the above installation process. Specifically, with the tool clamped, the machine tool pedal is stepped on to change the spindle movement. The machine tool drawbar 2 drives the drawbar link 43 to move away from the chuck assembly 1. The drawbar link 43 drives the connecting column 46 to move. The connecting column 46 pulls the chuck pull ring 45 to move towards the machine tool drawbar 2. The chuck pull ring 45 drives the first chuck 11, the second chuck 12, and the third chuck 13 to move. At this time, the first chuck 11, the second chuck 12, and the third chuck 13 are gradually released outward until the action stops when the drawbar chuck pull ring 45 is close to the pull ring flange 44. The set screw 132 separates from the roller tooth groove 51, the chuck assembly 1 releases the workpiece 5, and the workpiece 5 can be removed. Then repeat the above installation process, clamp the workpiece 5 on the second machine tool, pass the workpiece 5 through the anti-misalignment hole 100 and clamp it in the chuck assembly 1, then process the second eccentric wheel, and then obtain two eccentric wheels with an included angle of 180°, thus completing the processing of the eccentric shaft workpiece 5.

[0102] In summary, the auxiliary tooling consisting of locking assembly 4 and chuck assembly 1 can easily determine the eccentric position of workpiece 5, saving time and improving machining accuracy.

[0103] This specific embodiment is merely an explanation of the utility model and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of protection of this utility model.

Claims

1. An auxiliary jig for machining eccentric shaft workpieces, characterized by, include: The locking assembly (4) is mounted on the machine tool spindle (3), located on one side of the machine tool spindle (3), and is detachably connected to the machine tool spindle (3); A chuck assembly (1) is disposed on the locking assembly (4) and detachably connected to the locking assembly (4). The workpiece (5) is clamped in the clamping cavity formed by the chuck assembly (1). The chuck assembly (1) is used to limit the deviation displacement of the workpiece (5) along the radial direction of the machine tool spindle. The locking assembly (4) is used to drive the chuck assembly (1) to retract through an action to clamp the workpiece (5).

2. The auxiliary jig for machining an eccentric shaft workpiece according to claim 1, wherein The locking assembly (4) includes: A locking flange (41) is provided on the machine tool spindle (3), and one side wall of the flange is connected to the machine tool spindle. A locking sleeve (42) is provided on the other side wall of the locking flange (41), one side of which is detachably connected to the locking flange (41), and the clamp assembly (1) is embedded in the locking sleeve (42); The tie rod link (43) is set on the outer wall of the machine tool tie rod (2), located on one side of the machine tool spindle (3), and screwed to the machine tool tie rod (2); A pull ring flange (44) is disposed inside the locking sleeve (42) and is coaxial with the pull rod link (43). There is a gap between its end face and the end face of the pull rod link (43). It is connected to the locking sleeve (42) by screws (49). The pull rod link (43) is located on one side of the pull ring flange (44). A clamping ring (45) is disposed on the other side of the clamping ring flange (44) and there is a gap between it and the clamping ring flange (44). Its end inner wall is connected to the clamping assembly (1). The clamping ring (45) moves synchronously with the pull rod link (43).

3. The auxiliary jig for machining an eccentric shaft workpiece according to claim 2, wherein The locking assembly (4) further includes: The connecting column (46) slides through the pull ring flange (44) and is connected to the pull rod link (43) and the clamp pull ring (45) respectively; A positioning plate (48) is formed on the pull ring flange (44), and a positioning pin (47) is connected to the positioning plate (48). The positioning pin (47) is located between the positioning plate (48) and the chuck assembly (1) and is adapted to the positioning plate (48). The positioning pin (47) is used to limit the clamping depth of the workpiece (5) in the chuck assembly (1).

4. The auxiliary jig for machining an eccentric shaft workpiece according to claim 2, wherein The clamp assembly (1) includes: A first chuck (11), a second chuck (12), and a third chuck (13) are arranged in a ring and one end is fastened to the chuck pull ring (45). The first chuck (11), the second chuck (12), and the third chuck (13) form the clamping cavity, and the workpiece (5) is located in the clamping cavity. Driven by the chuck pull ring (45), the first chuck (11), the second chuck (12), and the third chuck (13) can move closer to or further away from each other to clamp or release the workpiece (5).

5. The auxiliary tooling for machining eccentric shaft type workpieces according to claim 4, characterized in that, The first clamp (11) has the same structure as the second clamp (12), and the third clamp (13) has a different structure from the first clamp (11) and the second clamp (12).

6. The auxiliary tooling for machining eccentric shaft type workpieces according to claim 5, characterized in that, The third chuck (13) is provided with: The screw hole (131) is a through hole that passes through the locking sleeve (42) and the third chuck (13) in sequence, and is perpendicular to the axis of the workpiece (5); A set screw (132) is provided in the screw hole (131), and its working end passes through the screw hole (131) and abuts against the roller tooth groove (51) on the workpiece (5) to limit the position of the workpiece (5); A spring (133) is disposed on the set screw (132) and located inside the screw hole (131), with its bottom end abutting against the set screw (132); A clamping screw (134) is disposed in the screw hole (131) and abuts against the top of the spring (133) for rotating in the screw hole (131) to clamp or release the spring (133).

7. The auxiliary tooling for machining eccentric shaft type workpieces according to claim 4, characterized in that, The locking sleeve (42) has the following openings: The first locking cavity (421) corresponds to the position of the chuck assembly (1), and its inner wall is in contact with the side wall of the first chuck (11), the side wall of the second chuck (12) and the side wall of the third chuck (13); The second locking cavity (422) is located in the middle region of the locking sleeve (42), communicates with the first locking cavity (421), and is connected to the clamp pull ring (45) by screws; The third locking cavity (423) communicates with the second locking cavity (422), is adapted to the pull ring flange (44), and is connected to the locking flange (41) by the screw (49).

8. The auxiliary tooling for machining eccentric shaft-type workpieces according to claim 4, characterized in that, The first clamp (11), the second clamp (12) and the third clamp (13) are all provided with grooves (130) at their roots, and the grooves (130) are engaged with the locking sleeve (42).

9. The auxiliary tooling for machining eccentric shaft type workpieces according to claim 4, characterized in that, Both the first chuck (11) and the second chuck (12) have flat grooves (135) on their side walls.

10. The auxiliary tooling for machining eccentric shaft type workpieces according to any one of claims 1-9, characterized in that, It also includes a mis-proof pressure cover (10) with a mis-proof hole (100); the mis-proof pressure cover (10) is located upstream of the clamp assembly (1) and is connected to the locking sleeve (42) on the locking assembly (4) by screws.

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