Watch bearing axial clearance dynamic measuring instrument and measuring method

Abstract

The invention belongs to the field of watch miniature bearing measuring instruments, particularly relates to a watch bearing axial clearance dynamic measuring instrument and a measuring method, and aims to overcome the defects in the background technology and improve the reliability of bearing quality detection. According to the technical scheme, the watch bearing axial clearance dynamic measuring instrument is characterized by comprising a main shaft module used for locking a positioning column and installing a bearing and an automatic hammer; the driving module is used for driving the main shaft module to rotate so as to realize processing of the positioning column and accelerated running-in of the bearing; the machining module is used for precisely machining the positioning column and guaranteeing the rotation precision of the bearing; the measuring module is used for detecting the axial clearance variation of the bearing; the time control module is used for controlling the working time of the driving module; the machine frame is used for installing the main shaft module, the driving module, the machining module, the measuring module and the time control module.

Description

Technical Field

[0001] The invention belongs to the field of watch micro bearing measuring instruments, and in particular relates to a watch bearing axial clearance dynamic measuring instrument and a measuring method. Background Art

[0002] The watch bearing is a functional component in the automatic watch movement. Its main function is to support the rotation of the watch's automatic hammer, reduce the friction coefficient during the movement of the automatic hammer, ensure its rotation accuracy, and control the axial position of the automatic hammer. The axial clearance between the inner and outer rings of the watch bearing directly determines the working state of the automatic hammer in the watch. If the clearance is too large, the automatic hammer will interfere with the movement, causing the automatic hammer to rotate inflexibly, abnormal noise and other faults, which will eventually affect the accuracy of the mechanical watch and may even stop running.

[0003] The common practice at present is to fix the inner ring or outer ring of the watch bearing, and then move the unfixed side of the bearing axially. The amount of movement is the axial clearance, which is used to judge the quality of the bearing.

[0004] However, bearings are movable parts, and existing testing methods can only determine the quality of the axial clearance of bearings when they leave the factory, ensuring that there are no problems with the bearings in the early stages of watch use. As bearings are used for longer, the bearings, balls, inner rings, outer rings and other components wear out due to running-in, causing changes in the axial clearance between the inner ring and the outer ring. Existing testing methods cannot effectively evaluate the reliability of bearings throughout their life cycle.

[0005] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies in the above-mentioned background technology and to provide a watch bearing axial clearance dynamic measuring instrument and a measuring method so as to improve the reliability of bearing quality detection.

[0007] The technical solution of the present invention is:

[0008] A dynamic measuring instrument for the axial clearance of a watch bearing, characterized in that: the measuring instrument comprises

[0009] Spindle module, used to lock the positioning column and install the bearing and automatic hammer;

[0010] The drive module is used to drive the spindle module to rotate, so as to realize the machining of the positioning column and the accelerated running-in of the bearing;

[0011] Processing module, used for precision machining of positioning columns to ensure bearing rotation accuracy;

[0012] Measuring module for detecting the deterioration of the axial clearance of the bearing;

[0013] The time control module is used to control the working time of the driving module;

[0014] The rack is used to install the spindle module, drive module, processing module, measurement module and timing control module.

[0015] The spindle module comprises a spindle rotatably positioned on a frame, a spring chuck inserted at the right end of the spindle, a locking shaft inserted at the left end of the spindle and threadedly connected to the spring chuck, and a handle fixed to the locking shaft.

[0016] The main shaft is rotatably positioned on the frame through a shaft sleeve; the main shaft axially passes through the shaft sleeve, and the main shaft is axially fixed to the shaft sleeve through the cooperation of the step surface and the locking nut.

[0017] The measuring module includes a limit seat and a meter seat installed on the frame, a limit bolt threadedly connected to the limit seat for controlling the distance between the limit seat and the meter seat, a micrometer installed on the meter seat, and an adjusting screw threadedly connected to the limit seat and the meter seat for adjusting the position of the meter seat.

[0018] The processing module comprises a processing seat mounted on a frame, a tool holder with a tool, and a transverse adjustment mechanism and a longitudinal adjustment mechanism arranged between the processing seat and the tool holder for adjusting the transverse position and the longitudinal position of the tool respectively.

[0019] The driving module comprises a motor, a driving wheel driven by the motor, a driven wheel connected to the main shaft, and a belt.

[0020] The time control module includes a time relay, and the time of main shaft rotation is controlled by the time relay.

[0021] The frame comprises a bottom plate, a base fixed on the bottom plate, a slide fixed to the base, and a protective cover.

[0022] The driving module and the timing control module are installed on the bottom plate, the spindle module is rotatably positioned on the base, and the processing module and the measuring module are installed on the slide; the protective cover surrounds the spindle module, the driving module, the processing module, and the measuring module.

[0023] A measuring method of a watch bearing axial clearance dynamic measuring instrument comprises the following steps:

[0024] S1. Processing positioning column

[0025] 1) Place the positioning column into the spring chuck;

[0026] 2) Turn the handle so that the spring collet clamps the positioning column;

[0027] 3) Install the processing module on the slide;

[0028] 4) The motor is started, and a positioning boss is processed on the positioning column using a processing module;

[0029] 5) Remove the processing module;

[0030] S2. First measurement

[0031] 1) Install the bearing, automatic hammer and locking bolt on the positioning column in sequence;

[0032] 2) Install the measuring module on the slide and adjust the base to return the micrometer to zero:

[0033] 3) Remove the micrometer;

[0034] S3. Running-in test

[0035] 1) Cover the protective cover and start the motor for testing;

[0036] 2) After the test is completed, open the protective cover;

[0037] S4. Second measurement

[0038] Move the gauge seat to the left and use the micrometer to measure the fluctuation value of the axial clearance between the inner and outer rings of the bearing before and after the test.

[0039] The beneficial effects of the present invention are:

[0040] 1. The present invention can provide high-speed rotation test conditions, simulate the working state of the bearing inside the watch, so as to accelerate the running-in, realize the monitoring of the axial clearance condition of the watch bearing after a period of use or during the entire life cycle, help to optimize the product design in the early stage of development, and verify the processing quality of the bearing during mass production, so as to ensure the reliability of the watch bearing;

[0041] 2. The present invention drives the bearing to rotate at high speed by arranging a motor, so as to accelerate the running-in of the bearing components and the test process, thereby shortening the life test time of the product. It can provide a basis for the design optimization of the bearing in the early stage of development, and can also be used for quality control of the production process, and finally produce products that meet the standard requirements;

[0042] 3. The present invention realizes multi-level speed adjustment of the driving module by providing a driven wheel with multiple grooves, and can select a suitable speed according to the use conditions of the watch bearing to meet the requirements of different working conditions, making the test more practical;

[0043] 4. The present invention provides a spring chuck on the main shaft, and only needs to replace the positioning column for different bearings, which has a wide range of applications, reliable positioning and simple operation;

[0044] 5. The present invention processes a positioning boss for mounting the bearing on the positioning column by setting a processing module, controls the rotation accuracy of the bearing positioning column within 2 microns, reduces abnormal wear caused by system deviation, and ensures more accurate test results;

[0045] 6. The present invention can set the time control module to accurately determine the test time to seconds, thus ensuring the consistency of the test conditions;

[0046] 7. The present invention measures the change in axial clearance of the watch bearing before and after the accelerated wear test by setting a measuring module, thereby reflecting the reliability of the watch bearing during use; and the measuring module controls the position of the micrometer through a rigid structure to ensure the consistency of the position before and after the test, so that the test data is accurate and the operation is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a three-dimensional structural schematic diagram of the present invention (processing state).

[0048] Figure 2 It is a schematic diagram of the main structure of the present invention (processing state).

[0049] Figure 3 It is a left-side structural schematic diagram of the present invention (processing state).

[0050] Figure 4 It is a schematic diagram of the top structure of the present invention (processing state).

[0051] Figure 5 It is a schematic diagram of the three-dimensional structure of the present invention (measurement state).

[0052] Figure 6 It is a schematic diagram of the main structure of the present invention (measurement state).

[0053] Figure 7 It is a left-side structural schematic diagram (measurement state) of the present invention.

[0054] Figure 8 It is a schematic diagram of the top structure of the present invention (measurement state).

[0055] Fig. 9 It is a three-dimensional structural schematic diagram of the processing module of the present invention.

[0056] Fig.10 It is a three-dimensional structural schematic diagram of the measurement module of the present invention.

[0057] Fig.11 It is a schematic cross-sectional structure diagram of the spindle module of the present invention.

[0058] Fig.12 It is a schematic diagram of the connection relationship between the positioning column, the bearing, the automatic hammer and the screw of the present invention.

[0059] Fig.13 yes Fig.12 Exploded diagram.

[0060] Fig.14It is a three-dimensional structural schematic diagram of the positioning column of the present invention.

[0061] Fig.15 It is a schematic diagram of the measurement method of the present invention.

[0062] Fig.16 It is an exploded view of the present invention.

[0063] Reference numerals:

[0064] Spindle module 1, spindle 11, chuck seat 11-1, spring chuck 12, locking shaft 13, handle 14, sleeve 15, locking nut 16;

[0065] Driving module 2, motor 21, driving wheel 22, driven wheel 23, belt 24;

[0066] Processing module 3, processing seat 31, processing seat slide hole 31-1, tool 32, tool holder 33, lateral adjustment mechanism 34, longitudinal adjustment mechanism 35, processing seat bolt 36;

[0067] Measuring module 4, limit seat 41, limit seat sliding hole 41-1, table seat 42, table seat sliding hole 42-1, limit bolt 43, micrometer 44, table head 44-1, adjusting screw 45, limit seat bolt 46, table seat bolt 47;

[0068] Time control module 5, frame 6, bottom plate 61, base 62, slide 63, protective cover 64;

[0069] Positioning column 71, positioning boss 71-1, positioning screw hole 71-2, positioning step surface 71-3, outer circumferential surface of the column 71-4, bearing 72, automatic hammer 73, locking bolt 74. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0071] like Figure 1 As shown, a watch bearing axial clearance dynamic measuring instrument includes a spindle module 1, a drive module 2, a processing module 3, a measuring module 4, a time control module 5, and a frame 6. Among them:

[0072] The spindle module, drive module, processing module, time control module and measurement module are all installed on the rack;

[0073] The spindle module is used to lock the positioning column 71, and the automatic hammer 73 is installed on the positioning column through the bearing 72 and fixed with the locking bolt 74;

[0074] The drive module is used to drive the spindle module to rotate, so as to realize the machining of the positioning column and the accelerated running-in of the bearing;

[0075] Processing module, used for precision machining of positioning columns to ensure bearing rotation accuracy;

[0076] Measuring module for detecting the deterioration of the axial clearance of the bearing;

[0077] The timing control module is used to control the working time of the driving module.

[0078] The method of using the measuring instrument is: first use the processing module to precisely process the positioning column and install the bearing, then use the measuring module to perform the first measurement, then perform accelerated running-in of the bearing, and finally use the measuring module to perform the second measurement to obtain the axial clearance deterioration.

[0079] like Fig.12 and Fig.13 As shown, the positioning column is provided with a positioning boss 71-1 and a positioning screw hole 71-2, the inner ring of the bearing is mounted on the positioning boss, the automatic hammer is mounted on the outer ring of the bearing, and then the locking bolt is installed into the positioning screw hole to tighten and fix the bearing. The positioning boss of the positioning column is obtained by precision machining of the machining module.

[0080] frame

[0081] The frame includes a bottom plate 61, a base 62, a slide 63, and a protective cover 64. The base is fixed on the bottom plate, and the slide is transversely fixed to the side of the base. The drive module and the time control module are installed on the bottom plate, the spindle module is installed on the base, and the processing module and the measurement module are installed on the slide and can adjust the transverse position ( Figure 1 The protective cover surrounds the spindle module, the drive module, the processing module, and the measuring module, and the timing control module is located outside the protective cover.

[0082] Spindle module

[0083] The spindle module includes a spindle 11 , a spring chuck 12 , a locking shaft 13 , and a handle 14 .

[0084] like Fig.11 As shown, the spindle is provided with an axially extending center hole, the right end of the spindle is a chuck seat 11-1 with an inner conical surface, the spring chuck is inserted in the chuck seat, the spring chuck is provided with an outer conical surface matching the inner conical surface, the locking shaft extends from the left end of the spindle into the center hole, the right end of the locking shaft is threadedly connected with the left end of the spring chuck, and the left end of the locking shaft extends out of the spindle and is fixed to the handle.

[0085] When the handle is turned, the locking shaft applies tension to the spring chuck through the thread to make it move axially. The outer conical surface of the spring chuck cooperates with the inner conical surface of the chuck seat to make the spring chuck produce a slight elastic deformation in the radial direction, thereby centering and clamping the positioning column.

[0086] The main shaft is rotatably positioned on the base through a shaft sleeve 15. Fig.11 As shown, two sleeves are rotatably positioned on the base, and the spindle passes through the two sleeves axially. The step surface of the chuck seat at the right end of the spindle abuts against the end surface of the right sleeve, and the locking nut 16 is threadedly connected to the left end of the spindle and the locking nut abuts against the end surface of the right sleeve. The spindle and the sleeve are axially fixed by the step surface of the chuck seat and the axial limitation of the locking nut.

[0087] Driver module

[0088] The driving module comprises a motor 21, a driving wheel 22, a driven wheel 23, and a belt 24. The motor is fixed on a bottom plate, the driving wheel is coaxially connected to the motor shaft, the driven wheel is coaxially connected to the main shaft, and the belt is mounted on the driving wheel and the driven wheel.

[0089] The power of the motor is transmitted to the main shaft through the driving wheel, the belt and the driven wheel in sequence, thereby driving the main shaft to rotate, so as to achieve the precision processing of the positioning column and the accelerated wear of the bearing.

[0090] The outer circumference of the driven wheel is provided with a plurality of annular speed grooves of different outer diameters, and the belt is installed in one of the speed grooves to adjust the speed of the main shaft. Fig.11 As shown, there are three speed grooves on the driven wheel, and the corresponding spindle speeds are 4000r / min, 5000r / min, and 6500r / min respectively.

[0091] Processing module

[0092] The processing module includes a processing seat 31 , a tool 32 , a tool holder 33 , a transverse adjustment mechanism 34 , and a longitudinal adjustment mechanism 35 .

[0093] The processing seat is mounted on the slide, and the processing seat can slide horizontally along the slide. The processing seat is fixed to the slide by a processing seat bolt 36, and the processing seat is provided with a processing seat slide hole 31-1 that matches the slide. The tool is fixed to the tool holder, and a horizontal adjustment mechanism and a vertical adjustment mechanism are provided between the tool holder and the processing seat, which are used to adjust the horizontal position and the vertical position of the tool respectively, so that the tool holder has feeding motion in the X-axis direction and the Z-axis direction.

[0094] Measurement module

[0095] The measuring module includes a limit seat 41 , a gauge seat 42 , a limit bolt 43 , a micrometer 44 , and an adjusting screw 45 .

[0096] The limit seat and the meter seat are both installed on the slide, and both the limit seat and the meter seat can slide horizontally along the slide. The limit seat is fixed to the slide by a limit seat bolt 46, and the meter seat is fixed to the slide by a meter seat bolt 47. The limit seat is provided with a limit seat sliding hole 41-1 that cooperates with the slide, and the meter seat is provided with a meter seat sliding hole 42-1 that cooperates with the slide.

[0097] The limit seat is arranged close to the main shaft, and the meter seat is arranged far from the main shaft. The limit bolt is installed on the side of the limit seat facing the meter seat. The limit bolt is used to control the distance between the limit seat and the meter seat. The meter seat is provided with a limit screw hole for threaded connection with the limit bolt. The adjustment screw rod is installed on the connection between the limit seat and the meter seat at the same time. The adjustment screw rod is used to adjust the position of the meter seat. The limit seat and the meter seat are provided with an adjustment screw hole for threaded connection with the adjustment screw rod.

[0098] Time control module

[0099] The time control module comprises a time relay, which is electrically connected to the motor. The time of the bearing rotation is controlled by the time relay, and the time relay uses seconds as the timing unit.

[0100] A measuring method of a watch bearing axial clearance dynamic measuring instrument comprises the following steps:

[0101] S1. Processing positioning column

[0102] 1) According to the bearing model to be measured, such as "2824 bearing", select the appropriate locating column and put the locating column into the spring chuck;

[0103] 2) Turn the handle so that the spring chuck clamps the outer circumferential surface 71-4 of the positioning column;

[0104] 3) Install the processing module on the slide; move the processing seat to the appropriate position and tighten the processing seat bolts;

[0105] 4) The motor is started, the spindle drives the positioning column to rotate, and the tool of the processing module is used to process the positioning step surface 71-3 on the positioning column, thereby obtaining a positioning boss to facilitate the subsequent installation of the bearing;

[0106] Since a certain amount of machining allowance is reserved for the locating column, the machining module can be used to machine the locating boss, thereby ensuring that the rotation center of the bearing equipped with an automatic hammer is consistent with the locating center when rotating at high speed; bearings of the same model can share a locating column, but the locating column removed from the spindle cannot be reused and can only be replaced with a new one for re-machining;

[0107] 5. After processing is completed, remove the processing module;

[0108] S2. First measurement

[0109] 1) First install the bearing on the positioning column, then install the automatic hammer on the bearing, and finally tighten it with the locking bolt.

[0110] 2) Install the measurement module on the slide:

[0111] a) Move the limit seat and the meter seat to the appropriate position and tighten the limit seat bolts and the meter seat bolts;

[0112] b) If Figure 6 As shown, rotating the adjusting screw drives the meter seat to move leftward (the meter seat moves toward the bearing);

[0113] like Fig.13 As shown, after the meter head 44-1 of the micrometer presses the outer ring of the bearing, continue to rotate the adjusting screw to ensure that the pointer of the micrometer rotates one circle (after the bearing clearance becomes larger, the meter head can still press the outer ring of the bearing);

[0114] c) Adjust the limit bolt so that it rests against the meter seat;

[0115] d) The micrometer pointer returns to zero and the outer ring of the bearing returns to its initial state;

[0116] 3) Turn the adjusting screw to move the meter base to the right, so that the micrometer moves to a safe position;

[0117] 4) According to technical requirements, adjust the running time of the time control module (such as 120S) and put the belt into the appropriate speed slot, as shown in the figure below (such as 5000r / min);

[0118] S3. Running-in test

[0119] 1) Cover the protective cover, start the motor for testing, the main shaft drives the positioning column and the inner ring of the bearing to rotate, and the outer ring of the bearing and the automatic hammer do not move;

[0120] 2) After the test is completed, open the protective cover;

[0121] S4. Second measurement

[0122] 1) Turn the adjusting screw to move the micrometer to the left until the micrometer head contacts the bearing;

[0123] 2) Record the pointer reading of the micrometer to obtain the fluctuation value of the axial clearance between the inner ring and the outer ring of the bearing before and after the test.

[0124] To sum up, the watch bearing axial clearance dynamic measuring instrument provided by the present invention can simulate the assembly and movement form of the watch bearing in a mechanical watch, realize the dynamic test of the watch bearing axial clearance, so as to achieve the accelerated running-in of the test watch bearing, and accurately measure the fluctuation value of the axial clearance before and after the test, that is, the axial clearance state of the watch bearing during the entire use cycle, so as to quickly, conveniently and practically confirm its reliability, provide a basis for the design optimization of the bearing, and also be used for quality control of the production process, so as to finally produce products that meet the standard requirements, which plays a vital role in improving the overall quality of the product and the wearing effect.

[0125] It should be understood that the above description is only a preferred embodiment of the present invention and is not sufficient to limit the technical solution of the present invention. For ordinary technicians in this field, within the spirit and principles of the present invention, additions, substitutions, changes or improvements can be made according to the above description, and all these additions, substitutions, changes or improved technical solutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A watch bearing axial clearance dynamic measuring instrument, characterized in that: The measuring instrument includes The spindle module (1) is used to lock the positioning column and install the bearing and the automatic hammer; A drive module (2) is used to drive the spindle module to rotate, so as to achieve the machining of the positioning column and the accelerated running-in of the bearing; A processing module (3) is used for precision processing of the positioning column to ensure the rotation accuracy of the bearing; A measuring module (4) for detecting the deterioration of the axial clearance of the bearing; A time control module (5), used for controlling the working time of the driving module; The frame (6) is used for installing the spindle module, the drive module, the processing module, the measuring module and the time control module.

2. A watch bearing axial clearance dynamic measuring instrument according to claim 1, characterized in that: The spindle module comprises a spindle (11) rotatably positioned on a frame, a spring chuck (12) inserted at the right end of the spindle, a locking shaft (13) inserted at the left end of the spindle and threadedly connected to the spring chuck, and a handle (14) fixed to the locking shaft.

3. The dynamic measuring instrument for axial clearance of watch bearings according to claim 1, characterized in that: The main shaft is rotatably positioned on the frame through a shaft sleeve (15); the main shaft axially passes through the shaft sleeve, and the main shaft is axially fixed to the shaft sleeve through the cooperation of the step surface and the locking nut (16).

4. The watch bearing axial clearance dynamic measuring instrument according to claim 1, characterized in that: The measuring module comprises a limit seat (41) and a meter seat (42) mounted on a frame, a limit bolt (43) threadedly connected to the limit seat for controlling the distance between the limit seat and the meter seat, a micrometer (44) mounted on the meter seat, and an adjusting screw (45) threadedly connected to the limit seat and the meter seat for adjusting the position of the meter seat.

5. The watch bearing axial clearance dynamic measuring instrument according to claim 1, characterized in that: The processing module comprises a processing base (31) mounted on a frame, a tool holder (33) with a tool (32), and a transverse adjustment mechanism (34) and a longitudinal adjustment mechanism (35) arranged between the processing base and the tool holder for respectively adjusting the transverse position and the longitudinal position of the tool.

6. The watch bearing axial clearance dynamic measuring instrument according to claim 1, characterized in that: The driving module comprises a motor (21), a driving wheel (22) driven by the motor, a driven wheel (23) connected to the main shaft, and a belt (24).

7. The watch bearing axial clearance dynamic measuring instrument according to claim 1, characterized in that: The time control module includes a time relay, and the time of main shaft rotation is controlled by the time relay.

8. The watch bearing axial clearance dynamic measuring instrument according to claim 1, characterized in that: The frame comprises a bottom plate (61), a base (62) fixed on the bottom plate, a slide (63) fixed to the base, and a protective cover (64).

9. The watch bearing axial clearance dynamic measuring instrument according to claim 1, characterized in that: The driving module and the timing control module are installed on the bottom plate, the spindle module is rotatably positioned on the base, and the processing module and the measuring module are installed on the slide; the protective cover surrounds the spindle module, the driving module, the processing module, and the measuring module.

10. A measuring method of a watch bearing axial clearance dynamic measuring instrument, comprising the following steps: S1. Processing positioning column 1) Place the positioning column into the spring chuck; 2) Turn the handle so that the spring collet clamps the positioning column; 3) Install the processing module on the slide; 4) The motor is started, and a positioning boss is processed on the positioning column using a processing module; 5) Remove the processing module; S2. First measurement 1) Install the bearing, automatic hammer and locking bolt on the positioning column in sequence; 2) Install the measuring module on the slide and adjust the base to return the micrometer to zero: 3) Remove the micrometer; S3. Running-in test 1) Cover the protective cover and start the motor for testing; 2) After the test is completed, open the protective cover; S4. Second measurement Move the gauge seat to the left and use the micrometer to measure the fluctuation value of the axial clearance between the inner and outer rings of the bearing before and after the test.

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