On-line automatic calibration method for active dynamometer on bearing grinder
By setting up a calibration station and an automatic switching mechanism on the bearing grinding machine, online automatic calibration of the active measuring instrument is achieved, which solves the problem of accuracy drift of the active measuring instrument during the processing, improves work efficiency, reduces costs, and maintains the stability of processing accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XINXIANG SUNRISE CNC BEARING EQUIP
- Filing Date
- 2024-11-19
- Publication Date
- 2026-06-26
AI Technical Summary
The active measuring instrument on existing bearing grinding machines cannot be automatically calibrated during continuous batch automatic machining, resulting in drift in the dimensional accuracy of the machined workpieces. Existing solutions are either inefficient or costly.
A calibration station is set up on the bearing grinding machine, and the active measuring instrument automatically switches between the grinding station and the calibration station through a rotation mechanism and a telescopic mechanism. Combined with a servo motor and an inductive switch, online automatic calibration is achieved. The measuring jaw of the active measuring instrument intermittently moves back and forth between the two stations and automatically adjusts to maintain accuracy.
It enables real-time autonomous calibration of active measuring instruments, reduces labor and equipment costs, maintains long-term stability of processing accuracy, breaks the traditional manual inspection or off-machine testing mode, and improves work efficiency.
Smart Images
Figure CN119141447B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the technical field of online workpiece dimension detection on bearing grinding machines, and specifically to an online automatic calibration method for an active measuring instrument on a bearing grinding machine. Background Technology
[0002] An active measuring instrument is an instrument that can detect the external dimensions of a workpiece. It can also communicate with the machine tool. During the machining process, it can send a marker signal to the machine tool based on real-time measurement data, enabling the machine tool to automatically jump to each step of the machining process. This controls the machine tool to process the part to the preset size. In other words, the final size of the workpiece is read and confirmed by the active measuring instrument, and the machine tool is controlled to stop the feed to complete the machining.
[0003] Currently, when using bearing grinding machines to process bearing workpieces, the machines are characterized by large batch sizes and high dimensional consistency, often requiring the use of active measuring instruments to control the machining process and meet accuracy requirements. However, during continuous batch automatic machining on bearing grinding machines, the active measuring instruments cannot automatically calibrate or zero, and their accuracy drifts after long-term operation, leading to dimensional deviations in the machined workpieces that result in scrapping. To solve this problem, there are currently two existing methods:
[0004] 1. Offline Manual Method: During operation, processed workpieces are manually sampled and compared with standard parts offline. Deviation values are calculated, and the main measuring instrument is then manually calibrated to eliminate dimensional deviations between the produced workpieces and the standard parts. Standard parts are reference parts used for comparison and measurement of parts, i.e., workpieces that meet customer requirements.
[0005] 2. External Inspection Machine Method: After a machine tool equipped with an active measuring instrument is installed, an external inspection machine is attached to replace the human to complete the sampling inspection of parts, calculate the deviation of dimensional values, and then feed the results back to the machine tool to correct the feed parameters and eliminate the dimensional deviation.
[0006] Of the two methods above, the former is less efficient and the quality is difficult to control; the latter is more efficient but more expensive. Summary of the Invention
[0007] To address the problems in the existing technology, this invention provides an online automatic calibration method for an active measuring instrument on a bearing grinding machine, aiming to improve work efficiency and reduce the calibration cost of the active measuring instrument.
[0008] An online automatic calibration method for an active measuring instrument on a bearing grinding machine includes a bearing grinding machine and an active measuring instrument mounted on the bearing grinding machine. The bearing grinding machine has a grinding station where it grinds the workpiece to be processed. The active measuring instrument is used to measure the workpiece. The online automatic calibration method includes the following steps:
[0009] Step 1: Set up a calibration station on the bearing grinding machine and fix a standard part in the calibration station;
[0010] Step 2: Movably mount the active measuring instrument on the bearing grinding machine, and move the measuring jaws of the active measuring instrument between the grinding station and the calibration station to measure the workpiece to be processed and the standard part in both stations respectively.
[0011] Step 3: Set the threshold for processing workpieces on the bearing grinding machine. When the count value of the processed workpiece has not reached the threshold, place the measuring jaw of the active measuring instrument at the grinding station and execute Step 4; when the count value of the processed workpiece has reached the threshold, place the measuring jaw of the active measuring instrument at the calibration station and execute Step 5.
[0012] Step 4: Measure the workpiece to be processed using an active measuring instrument and transmit the measurement data to the bearing grinding machine. The bearing grinding machine grinds the workpiece according to the measurement data and obtains the finished workpiece. Increment the count value of the processed workpiece by 1; Execute Step 3:
[0013] Step 5: Measure the standard workpiece using the active measuring instrument to obtain the measured value. Determine whether the measured value is consistent with the standard value. If yes, set the count value of the processed workpiece to zero and proceed to step 3; otherwise, set the drift of the active measuring instrument to zero and simultaneously set the count value of the processed workpiece to zero, and proceed to step 3.
[0014] Furthermore, the outer end faces of the standard part and the workpiece to be processed are located in the same plane.
[0015] Furthermore, a drive device is fixedly installed on the bearing grinding machine at the position corresponding to the active measuring instrument. The drive device includes a rotating mechanism and a telescopic mechanism that are connected to each other. The rotating mechanism is fixedly connected to the bearing grinding machine and is used to drive the telescopic mechanism to rotate. The body of the active measuring instrument is fixedly connected to the telescopic component of the telescopic mechanism. The rotating mechanism drives the active measuring instrument to oscillate back and forth intermittently between the grinding station and the calibration station through the telescopic mechanism. The measuring jaw of the active measuring instrument jumps into or out of the workpiece or standard part to be processed through the telescopic mechanism.
[0016] Furthermore, the rotating mechanism includes a rotating support sleeve and a servo motor, both fixedly connected to the bearing grinding machine. A rotating shaft is rotatably installed inside the rotating support sleeve, passing through the rotating support sleeve. One end of the rotating shaft is fixedly connected to a telescopic mechanism, and the active measuring instrument is fixedly connected to the telescopic mechanism. The other end of the rotating shaft is connected to a reducer, which is fixedly installed on the rotating support sleeve. The reducer is connected to the servo motor, and the servo motor drives the active measuring instrument to swing after passing through the reducer, the rotating shaft, and the telescopic mechanism in sequence.
[0017] Furthermore, the telescopic mechanism includes a fixed seat fixedly connected to the rotating shaft, a telescopic cylinder and a guide rod fixedly installed on the fixed seat, the telescopic direction of the telescopic cylinder and the long direction of the guide rod are both consistent with the axial direction of the swing of the active measuring instrument, the telescopic rod of the telescopic cylinder is fixedly connected to the fixed seat, the cylinder body of the telescopic cylinder is slidably set on the guide rod, and the active measuring instrument is fixedly connected to the cylinder body of the telescopic cylinder through a connecting plate.
[0018] Further, the first limit position is defined as the limit position at which the measuring claw of the active measuring instrument, driven by the telescopic cylinder, jumps into the limit position of the workpiece or standard part to be processed. A limiting rod is provided on the fixed seat to limit the first limit position. The limiting rod is located between the fixed seat and the connecting plate and stops on the connecting plate.
[0019] Furthermore, an induction switch is installed in the telescopic mechanism to sense that the telescopic cylinder is in the first limit position. The induction switch, the rotating mechanism, and the telescopic mechanism are all connected to the controller of the bearing grinding machine.
[0020] Furthermore, a V-groove for accommodating standard parts is provided on the panel of the bearing grinding machine. One end of the V-groove is slidably mounted on a positioning rod. A positioning screw is provided between the V-groove and the positioning rod. The positioning screw is used to position one end of the V-groove on the positioning rod. The longitudinal direction of the positioning rod is perpendicular to the axial direction of the active measuring instrument's swing. The opening of the V-groove faces upward.
[0021] Further, the threshold is set to 1, so that a calibration is performed after processing one workpiece.
[0022] Furthermore, the threshold is greater than 1, thus enabling interval calibration.
[0023] The beneficial effects of this invention are as follows: By utilizing existing active measuring instruments, a calibration station for placing standard parts is added near the grinding station, allowing the active measuring instrument to automatically switch between the grinding and calibration stations, realizing alternating processing and calibration; only local modifications are needed to the active measuring instrument's software as required, enabling it to automatically zero upon receiving a signal, effectively overcoming the shortcomings of existing methods; this invention can autonomously calibrate the active measuring instrument in real time, correcting dimensional drift caused by factors such as temperature changes and wear of the measuring jaws, and can achieve long-term stable measurement and control of the workpiece to be processed. In this way, the active measuring instrument itself forms a new closed-loop processing mode of processing + measurement + calibration + automatic control, breaking the traditional mode of manual inspection or external inspection machine monitoring of dimensions, reducing labor and equipment costs, and maintaining processing accuracy over a long period of time. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the bearing grinding machine in this invention;
[0025] Figure 2 This is a schematic diagram of the structure located at the calibration station on a bearing grinding machine.
[0026] Figure 3 This is a cross-sectional view of the driving device in this invention;
[0027] Figure 4 This is a diagram showing the coordination relationship between the driving device, the active measuring instrument, and the workpiece in this invention. Detailed Implementation
[0028] The present invention will now be described in detail with reference to the accompanying drawings. Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The directional terms such as left, center, right, top, and bottom in the embodiments of the present invention are only relative concepts or referenced to the normal use state of the product, and should not be considered restrictive.
[0029] An online automatic calibration method for an active measuring instrument on a bearing grinding machine, such as... Figure 1 As shown, the device includes a bearing grinding machine 1 and an active measuring instrument 2 mounted on the bearing grinding machine 1. A grinding station 11 is provided on the bearing grinding machine 1. The bearing grinding machine 1 grinds the workpiece 5 to be processed in the grinding station 11. The active measuring instrument 2 is used to measure the workpiece 5 to be processed. The online automatic calibration method includes the following steps:
[0030] Step 1: Set up a calibration station 12 on the bearing grinding machine 1, and fix a standard part 4 in the calibration station 12, ensuring that the outer end face of the standard part 4 and the workpiece 5 to be processed are in the same plane; combined with Figure 2 As shown, a V-groove 41 for accommodating the standard part 4 is provided on the panel 13 of the bearing grinding machine 1. One end of the V-groove 41 is slidably mounted on the positioning rod 42. A positioning screw (not shown in the figure) is provided between the V-groove 41 and the positioning rod 42. The positioning screw is used to position one end of the V-groove 41 on the positioning rod 42. The longitudinal direction of the positioning rod 42 is perpendicular to the axial direction of the swing of the active measuring instrument 2. The opening of the V-groove 41 is facing upward.
[0031] Step 2: Movably mount the active measuring instrument 2 on the bearing grinding machine 1, and combine... Figure 4 As shown, the measuring jaw 21 of the active measuring instrument 2 moves between the grinding station 11 and the calibration station 12 and measures the workpiece 5 to be processed and the standard part 4 in both stations respectively.
[0032] Step 3: Set the threshold for the workpiece to be processed by bearing grinding machine 1. The threshold is a positive integer. When the count value of the processed workpiece has not reached the threshold, place the measuring jaw 21 of the active measuring instrument 2 at the grinding station 11 and execute step 4. When the count value of the processed workpiece reaches the threshold, place the measuring jaw 21 of the active measuring instrument 2 at the calibration station 12 and execute step 5.
[0033] Step 4: The active measuring instrument 2 measures the workpiece 5 to be processed and transmits the measurement data to the bearing grinding machine 1. The bearing grinding machine 1 grinds the workpiece 5 to be processed based on the measurement data and obtains the processed finished workpiece. The count value of the processed workpiece is incremented by 1; Execute step 3:
[0034] Step 5: Measure the standard workpiece 4 using the active measuring instrument 2 to obtain the measured value. Determine whether the measured value is consistent with the standard value. If yes, set the count value of the processed workpiece to zero and execute step 3; otherwise, set the drift of the active measuring instrument 2 to zero and set the count value of the processed workpiece to zero, and execute step 3.
[0035] In this embodiment, when the threshold is 1, a calibration is performed after processing one workpiece 5; in other embodiments, when the threshold is greater than 1, interval calibration is performed.
[0036] Among them, a drive device 3 is fixedly installed on the bearing grinding machine 1 at the position corresponding to the active measuring instrument 2, combined with Figure 3 and Figure 4As shown, the drive device 3 includes a rotating mechanism and a telescopic mechanism connected to each other. The rotating mechanism is fixedly connected to the bearing grinding machine 1 and is used to drive the telescopic mechanism to rotate. The main body of the active measuring instrument 2 is fixedly connected to the telescopic component of the telescopic mechanism. The rotating mechanism drives the active measuring instrument 2 to intermittently oscillate between the grinding station 11 and the calibration station 12 via the telescopic mechanism. The telescopic mechanism causes the measuring jaw 21 of the active measuring instrument 2 to jump into or out of the workpiece 5 or standard part 4 to be processed. The rotating mechanism includes a rotating support sleeve 33 and a servo motor 31, both fixedly connected to the bearing grinding machine 1. A rotating shaft 39 is rotatably installed inside the rotating support sleeve 33, passing through the rotating support sleeve 33. One end of the rotating shaft 39 is fixedly connected to the telescopic mechanism. The active measuring instrument 2 is fixedly connected to the telescopic component. The rotating shaft 39 is fixedly connected to the telescopic mechanism; the other end of the rotating shaft 39 is connected to the reducer 32, which is fixedly mounted on the rotating support sleeve 33. The reducer 32 is connected to the servo motor 31, which drives the active measuring instrument 2 to swing through the reducer 32, the rotating shaft 39 and the telescopic mechanism in sequence. The telescopic mechanism includes a fixed seat 38 fixedly connected to the rotating shaft 39. A telescopic cylinder 34 and a guide rod 37 are fixedly mounted on the fixed seat 38. The telescopic direction of the telescopic cylinder 34 and the long direction of the guide rod 37 are both consistent with the axial direction of the swing of the active measuring instrument 2. The telescopic rod of the telescopic cylinder 34 is fixedly connected to the fixed seat 38, and the cylinder body of the telescopic cylinder 34 is slidably mounted on the guide rod 37. The active measuring instrument 2 is fixedly connected to the cylinder body of the telescopic cylinder 34 through the connecting plate 35. To limit the depth to which the measuring claw 21 jumps into the standard part 4 and the workpiece 5 to be processed, the limit position at which the measuring claw 21 of the active measuring instrument 2 driven by the telescopic cylinder 34 jumps into the workpiece 5 or the standard part 4 is defined as the first limit position. A limiting rod 36 is provided on the fixed seat 38 to limit the first limit position. The limiting rod 36 is located between the fixed seat 38 and the connecting plate 35 and is stopped on the connecting plate 35. An induction switch 341 is provided in the telescopic mechanism to sense that the telescopic cylinder 34 is in the first limit position. The induction switch 341, the rotating mechanism and the telescopic mechanism are all connected to the controller of the bearing grinding machine 1.
[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. An online automatic calibration method for an active measuring instrument on a bearing grinding machine, comprising a bearing grinding machine and an active measuring instrument mounted on the bearing grinding machine, wherein a grinding station is provided on the bearing grinding machine, the bearing grinding machine grinds the workpiece to be processed in the grinding station, and the active measuring instrument is used to measure the workpiece to be processed, characterized in that: The online automatic calibration method includes the following steps: Step 1: Set up a calibration station on the bearing grinding machine and fix a standard part in the calibration station; Step 2: Movably mount the active measuring instrument on the bearing grinding machine, and move the measuring jaws of the active measuring instrument between the grinding station and the calibration station to measure the workpiece to be processed and the standard part in both stations respectively. Step 3: Set the threshold for processing workpieces on the bearing grinding machine. When the count value of the processed workpiece has not reached the threshold, place the measuring jaw of the active measuring instrument at the grinding station and execute Step 4; when the count value of the processed workpiece has reached the threshold, place the measuring jaw of the active measuring instrument at the calibration station and execute Step 5. Step 4: Measure the workpiece to be processed using an active measuring instrument and transmit the measurement data to the bearing grinding machine. The bearing grinding machine grinds the workpiece according to the measurement data and obtains the finished workpiece. Increment the count value of the processed workpiece by 1; Execute Step 3: Step 5: Measure the standard workpiece using the active measuring instrument to obtain the measured value. Determine whether the measured value is consistent with the standard value. If yes, set the count value of the processed workpiece to zero and proceed to step 3; otherwise, set the drift of the active measuring instrument to zero and simultaneously set the count value of the processed workpiece to zero, and proceed to step 3.
2. The online automatic calibration method for the active measuring instrument on a bearing grinding machine according to claim 1, characterized in that: Ensure that the outer end faces of the standard part and the workpiece to be processed are in the same plane.
3. The online automatic calibration method for the active measuring instrument on a bearing grinding machine according to claim 1 or 2, characterized in that: A drive device is fixedly installed on the bearing grinding machine at the position corresponding to the active measuring instrument. The drive device includes a rotating mechanism and a telescopic mechanism that are connected to each other. The rotating mechanism is fixedly connected to the bearing grinding machine and is used to drive the telescopic mechanism to rotate. The body of the active measuring instrument is fixedly connected to the telescopic component of the telescopic mechanism. The rotating mechanism drives the active measuring instrument to oscillate back and forth intermittently between the grinding station and the calibration station through the telescopic mechanism. The measuring jaw of the active measuring instrument jumps into or out of the workpiece or standard part to be processed through the telescopic mechanism.
4. The online automatic calibration method for the active measuring instrument on a bearing grinding machine according to claim 3, characterized in that: The rotating mechanism includes a rotating support sleeve and a servo motor, both fixedly connected to the bearing grinding machine. A rotating shaft is rotatably installed inside the rotating support sleeve, passing through the rotating support sleeve. One end of the rotating shaft is fixedly connected to a telescopic mechanism, and the active measuring instrument is fixedly connected to the telescopic mechanism. The other end of the rotating shaft is connected to a reducer, which is fixedly installed on the rotating support sleeve. The reducer is connected to the servo motor, and the servo motor drives the active measuring instrument to swing after passing through the reducer, the rotating shaft, and the telescopic mechanism in sequence.
5. The online automatic calibration method for the active measuring instrument on a bearing grinding machine according to claim 4, characterized in that: The telescopic mechanism includes a fixed base fixedly connected to the rotating shaft. A telescopic cylinder and a guide rod are fixedly installed on the fixed base. The telescopic direction of the telescopic cylinder and the longitudinal direction of the guide rod are both consistent with the axial direction of the swing of the active measuring instrument. The telescopic rod of the telescopic cylinder is fixedly connected to the fixed base. The cylinder body of the telescopic cylinder is slidably mounted on the guide rod. The active measuring instrument is fixedly connected to the cylinder body of the telescopic cylinder through a connecting plate.
6. The online automatic calibration method for the active measuring instrument on a bearing grinding machine according to claim 5, characterized in that: The first limit position is defined as the limit position where the measuring claw of the active measuring instrument, driven by the telescopic cylinder, jumps into the limit position of the workpiece or standard part to be processed. A limit rod is provided on the fixed base to limit the first limit position. The limit rod is located between the fixed base and the connecting plate and stops on the connecting plate.
7. The online automatic calibration method for the active measuring instrument on a bearing grinding machine according to claim 6, characterized in that: An inductive switch is installed in the telescopic mechanism to sense when the telescopic cylinder is in the first limit position. The inductive switch, the rotating mechanism, and the telescopic mechanism are all connected to the controller of the bearing grinding machine.
8. The online automatic calibration method for the active measuring instrument on a bearing grinding machine according to claim 3, characterized in that: The bearing grinding machine has a V-groove for accommodating standard parts on its panel. One end of the V-groove is slidably mounted on a positioning rod. A positioning screw is provided between the V-groove and the positioning rod to position one end of the V-groove on the positioning rod. The longitudinal direction of the positioning rod is perpendicular to the axial direction of the active measuring instrument's swing. The opening of the V-groove faces upward.
9. The online automatic calibration method for the active measuring instrument on a bearing grinding machine according to claim 1, characterized in that: The threshold is set to 1, so that a calibration is performed after processing one workpiece.
10. The online automatic calibration method for the active measuring instrument on a bearing grinding machine according to claim 1, characterized in that: The threshold is greater than 1, thus enabling interval calibration.