CN-121972699-A - Inner star wheel quick-change high-precision clamp

CN121972699ACN 121972699 ACN121972699 ACN 121972699ACN-121972699-A

Abstract

The invention belongs to the technical field of inner star wheel clamps, in particular to an inner star wheel quick-change high-precision clamp which comprises a clamping shell, wherein a clamping part is arranged in the clamping shell and comprises a quick-change clamping block, and the quick-change clamping block clamps an inner star wheel. This high smart anchor clamps of interior star gear quick change through setting up clamping part and drive part, through the slope sliding fit of chute and diagonal bar, and promote the conical surface drive of taper sleeve counter-insert pole upper roller, innovatively with the single axial motion of drive pneumatic cylinder, the synchronous decomposition and turn into three clamping jaw and have radial shrink and axial compressed combined motion concurrently, this structure makes anchor clamps when the centre gripping work piece excircle, can initiatively, reliably retrain the axial degree of freedom of work piece to overcome the weak defect of traditional three-jaw chuck axial restraint. The direct effect of the method is that firstly, the machine tool is allowed to process by adopting larger cutting depth and feeding rate, the processing efficiency is obviously improved, and the service life of the cutter is prolonged.

Inventors

LI KE
YUAN ZHAN
LI DEJIN
ZHU MINGJIE
ZHU YICHAO
QU JUNMEI
Fang Zhaoqian

Assignees

浙江康普瑞汽车零部件有限公司

Dates

Publication Date: 20260505
Application Date: 20260113

Claims (10)

1. The inner star wheel quick-change high-precision clamp comprises a clamping shell (1) and is characterized in that a clamping part is arranged in the clamping shell (1), the clamping part comprises a quick-change clamping block (23), and the quick-change clamping block (23) clamps the inner star wheel; The lower surface of the clamping shell (1) is provided with a driving part, the driving part comprises a pushing taper sleeve (33), and the quick-change clamping block (23) is pushed to move by lifting of the pushing taper sleeve (33); the intelligent early warning system comprises a monitoring system, a control unit and a control unit, wherein the monitoring system comprises a synchronous error detection unit, an automatic calibration unit, an intelligent early warning unit, a remote monitoring unit and a predictive maintenance unit.
2. The inner star wheel quick-change high-precision clamp disclosed in claim 1, wherein the clamping component further comprises a chute (2), the chute (2) is arranged on the inner wall of the clamping shell (1), the three chute (2) are distributed in an annular array, the inner wall of the chute (2) is slidably inserted with a chute rod (21), the top end of the chute rod (21) is fixedly provided with a female claw (22) through a bolt, the inner wall of the female claw (22) is in threaded connection with a locking bolt (24), the inner wall of the female claw (22) is slidably inserted with the outer surface of the quick-change clamping block (23), one end of the locking bolt (24) is in threaded connection with the inner wall of the quick-change clamping block (23), and the upper surface of the clamping shell (1) is fixedly provided with a positioning frame (25).
3. The quick-change high-precision clamp for the inner star wheel is characterized in that the driving part comprises a driving shell (3), the outer surface of the driving shell (3) is fixedly installed with the outer surface of the clamping shell (1), a pushing hydraulic cylinder (31) is fixedly installed on the lower surface of the driving shell (3), a fixing rod (32) is fixedly installed at one end of a piston rod of the pushing hydraulic cylinder (31), one end of the fixing rod (32) is in sliding connection with the inner wall of the pushing taper sleeve (33), a limiting ring (34) is sleeved on the outer surface of the fixing rod (32) in a sliding manner, and a locking nut (35) is connected to the outer surface of the fixing rod (32) in a threaded manner.
4. The quick-change high-precision clamp for the inner star wheel is characterized in that a pushing groove body (4) is slidably inserted into the inner wall of the pushing taper sleeve (33), the upper surface of the limiting ring (34) is in contact with the lower surface of the pushing groove body (4), one end of the inclined rod (21) is slidably inserted into an inserting rod (41) through a mounting frame, the mounting frame is fixedly mounted at one end of the inclined rod (21) through a bolt, one end of the inserting rod (41) is rotatably connected with a pushing roller (42) through a bearing, two opposite inserting rods (41) are slidably inserted into each other, the outer surface of the pushing roller (42) is in contact with the inner wall of the pushing groove body (4), a reset spring (43) is fixedly mounted on the outer surface of the inclined rod (21), and one end of the reset spring (43) is fixedly mounted with the inner wall of the inclined groove (2).
5. The quick-change high-precision clamp for the inner star wheel of claim 4, wherein an auxiliary groove (44) is formed in the inner wall of the pushing groove, an auxiliary roller (45) is rotatably connected to one end of the inserting rod (41), the outer surface of the auxiliary roller (45) is in contact with the inner wall of the auxiliary groove (44), a connecting spring (46) is fixedly arranged on the outer surface of one inserting rod (41), and one end of the connecting spring (46) is fixedly arranged on one end of the other inserting rod (41).
6. The quick-change high-precision clamp for the inner star wheel according to claim 5, wherein the synchronous error detection unit comprises a sensor group, a data acquisition module, an error calculation module and a threshold judgment module; The sensor group comprises a laser displacement sensor (5) assembly, a film pressure sensor and a temperature sensor, wherein the film pressure sensor is fixedly arranged on an axial supporting surface of the inserting and connecting rod (41), and the temperature sensor is arranged on the inner side wall of the driving shell (3) and is respectively used for collecting axial displacement data, contact pressure data and environmental temperature data of each clamping jaw; the data acquisition module is used for synchronously acquiring data of the sensor group; The error calculation module is used for calculating synchronous error values among the clamping jaws according to the collected displacement data and calculating pressure imbalance according to the pressure data; the threshold judging module is used for comparing the synchronization error value with a preset multilevel threshold value and judging a synchronization state level; The laser displacement sensor (5) assembly comprises a laser displacement sensor (5), a limiting guide rail (51), a sliding block (52), a spherical supporting seat (53), a spherical target surface (54), a connecting rod (55) and a connecting frame (56), wherein the laser displacement sensor (5) is fixedly installed on the inner bottom wall of a driving shell (3), the limiting guide rail (51) is fixedly installed on the inner bottom wall of the driving shell (3), the sliding block (52) is slidingly inserted into the inner wall of the limiting guide rail (51), the spherical supporting seat (53) is fixedly installed on the lower surface of the sliding block (52), the spherical target surface (54) is rotationally connected with the inner wall of the spherical supporting seat (53), the connecting frame (56) is fixedly installed on the outer surface of the inclined rod (21), two ends of the connecting rod (55) are hinged with the upper surface of the sliding block (52) and one end of the connecting frame (56) respectively through pin shafts, the connecting frame (56) is fixedly installed on the outer surface of the inclined rod (21), and the laser displacement sensor (5) is located under the spherical target surface (54).
7. The quick-change high-precision clamp for the inner star wheel according to claim 6, wherein the automatic calibration unit comprises a calibration flow control module, a parameter learning module and a compensation updating module; The calibration flow control module is used for controlling the clamp to execute no-load reciprocating motion so as to acquire sensor reference data; The parameter learning module is used for calculating zero offset, gain coefficient and temperature compensation curve of the sensor according to the reference data; The compensation updating module is used for updating the learned parameters to the system database and verifying the calibrated measurement accuracy.
8. The quick-change high-precision clamp for the inner star wheel of claim 7, wherein the intelligent early-warning unit comprises a multistage response module and a notification module; The multistage response module executes corresponding automatic response measures according to the synchronous state grade, including normal recording, visual/audible prompting, processing speed reduction, safe shutdown and emergency locking; the notification module is used for sending early warning or alarm information to appointed personnel through a short message, application pushing or Internet of things platform.
9. The quick-change high-precision clamp for the inner star wheel of claim 8, wherein the remote monitoring unit comprises an equipment positioning module, a data communication module and an internet of things platform interaction module; The equipment positioning module is used for acquiring geographic position information of the clamp or the detection system; the data communication module is used for uploading displacement, pressure and temperature data acquired in real time and the system state; The Internet of things platform interaction module is used for establishing connection with the cloud Internet of things platform to achieve remote visualization, historical query and remote diagnosis of data.
10. The quick-change high-precision clamp for the inner star wheel of claim 9, wherein the predictive maintenance unit comprises a service life calibration module, a state monitoring module and a health analysis module; The service life calibration module is used for carrying out initial calibration on service life of key moving parts and sensors The state monitoring module is used for recording the accumulated working time, the load cycle times and the performance attenuation data of each component in real time; the health degree analysis module is used for predicting the residual service life based on the historical data and the calibration data and generating maintenance reminding before performance degradation; The system comprises a user interaction unit, a control unit and a control unit, wherein the user interaction unit comprises a local human-computer interface module and a mobile terminal application module, the local human-computer interface module is used for displaying real-time waveforms, error values and system states on site and providing parameter setting and manual control inlets, and the mobile terminal application module provides remote monitoring and control functions corresponding to the local human-computer interface module; Each unit of the monitoring system is integrated in an embedded main control platform, and the platform has multichannel synchronous data acquisition, real-time algorithm processing and wired/wireless network communication capacity and performs signal interaction with a driving control system of the clamp so as to realize closed loop of monitoring and control.

Description

Inner star wheel quick-change high-precision clamp Technical Field The invention relates to the technical field of inner star wheel clamps, in particular to an inner star wheel quick-change high-precision clamp. Background The inner star wheel is used as a key transmission part and is widely applied to the fields of automobile differentials, precision reducers and the like. The dimensional accuracy and the position accuracy (especially the concentricity of the ball channel) and the surface quality of the ball channel (or the ball channel) directly influence the transmission stability, the noise service life and the bearing capacity of the assembly. Therefore, when the inner star wheel is subjected to finish machining such as turning, grinding and the like on the numerical control machine tool, extremely high requirements are placed on positioning and clamping of the workpiece. Currently, common three-jaw chucks (or similar three-jaw self-centering clamps) are commonly used for clamping the inner star wheel in the industry. The working principle of the clamp is that three clamping jaws are driven to synchronously move radially through planar threads or bevel gear transmission on the end face of the chuck, so that the outer cylindrical surface of a workpiece is clamped. Although the conventional clamping method has mature structure and wide application, the following inherent defects are gradually exposed when dealing with the processing of the inner star wheel with high precision and high efficiency: The axial positioning capability is insufficient, the machining efficiency and the service life of the tool are limited, when a common three-jaw chuck clamps, the radial freedom degree of the workpiece is mainly limited, the constraint capability on the axial freedom degree of the workpiece is very weak and basically in a failure state, when the characteristics of a ball channel, an end surface and the like of an inner star wheel are machined, particularly when high-speed cutting or strong grinding with large cutting depth and large feeding is performed, the workpiece is easy to generate tiny play or vibration in the axial direction due to huge axial cutting force; Based on the standard error of outer diameter clamping, the high concentricity requirement is difficult to ensure, one of the machining core requirements of the inner star wheel is concentricity of a plurality of ball channels relative to a central hole of a workpiece (the requirement is less than or equal to 0.1mm in general and the high precision requirement is even lower than 0.03 mm), the common three-jaw chuck is positioned by clamping the outer circle of the workpiece, the positioning precision is directly limited by the manufacturing precision (roundness and cylindricity) of the outer circle of the workpiece and the contact state of jaw jaws and the outer circle of the workpiece, and the shape error of any outer circle, uneven abrasion of the jaws or inconsistent clamping force can be converted into the positioning error of the workpiece and directly reflected on the concentricity of the machined ball channels. The mode of processing the fine features (ball tracks) by the rough reference (excircle) ensures that the control of the concentricity of the ball tracks has congenital deficiency, and the high-precision index less than or equal to 0.1mm is difficult to stably and reliably reach, so that the increasingly-improved ultrahigh-precision processing requirement is more difficult to meet; The change of the shape and adjustment are tedious and time-consuming, and the production flexibility and the comprehensive efficiency are affected, namely, corresponding claws or jaws need to be replaced when inner star wheels of different types are processed in mass production. After each change of shape, in order to ensure the centering accuracy of the clamping (i.e. the runout is within the allowable range), the three jaws usually need to be subjected to repeated cyclic debugging of clamping, trial cutting, measuring, disassembly and trimming (such as scraping the back of the jaw). The process has the advantages of high labor intensity, high requirements on the skills of operators, extremely time consumption, serious influence on the production efficiency of the production line and the equipment comprehensive utilization rate (OEE), and becomes one of the main bottlenecks for realizing quick die change (SMED) and flexible production. Disclosure of Invention Based on the technical problems that the existing inner star wheel clamp has insufficient axial positioning capability, limits machining efficiency and cutter service life, is difficult to ensure high concentricity requirement and complicated and time-consuming in mold changing and adjustment and affects production flexibility and comprehensive efficiency due to reference errors based on outer diameter clamping, the invention provides an inner star wheel quick-change high-precision clamp. The invention