Online automatic calibration method for active measuring instrument on bearing grinding machine

Abstract

The invention provides an on-line automatic calibration method for an active measuring instrument on a bearing grinding machine, the bearing grinding machine and the active measuring instrument installed on the bearing grinding machine are included, a grinding station is arranged on the bearing grinding machine, the bearing grinding machine grinds a workpiece to be machined in the grinding station, the active measuring instrument is used for measuring the workpiece to be machined, and the active measuring instrument is used for measuring the workpiece to be machined. An existing active measuring instrument is utilized, a calibration station for containing standard parts is additionally arranged near a grinding station, the active measuring instrument is automatically switched between the grinding station and the calibration station, and machining and calibration are alternately carried out; only software of the active measuring instrument needs to be locally modified according to requirements, and the received signal can be automatically zeroed, so that the defects of the existing method are effectively overcome; according to the invention, an active measuring instrument can be automatically corrected in a full-time manner, the size drift of the instrument caused by factors such as temperature change and measuring claw wear can be corrected, and long-term stable measurement and control of a to-be-processed workpiece can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of online detection of workpiece dimensions on a bearing grinder, and in particular to an online automatic calibration method for an active measuring instrument on a bearing grinder. Background Art

[0002] An active measuring instrument is an instrument that can detect the external dimensions of a workpiece. At the same time, the instrument can communicate with the machine tool. During the processing, it can send a mark signal to the machine tool based on the real-time measurement data, so that the machine tool can automatically jump to each step to complete, thereby controlling the machine tool to process the parts to a preset size. That is, the final size of the workpiece is read and confirmed by the active measuring instrument, and the machine tool is controlled to stop feeding and complete the processing.

[0003] At present, when bearing grinders are used to process bearing workpieces, bearing grinders have the characteristics of large batches and high dimensional consistency. They often need to cooperate with active measuring instruments to control the processing process to meet the processing accuracy requirements. The active measuring instruments used on bearing grinders cannot be automatically calibrated and zeroed during the continuous batch automatic processing of machine tools. After long-term work, their accuracy will drift, resulting in the size of the processed workpieces changing beyond the tolerance and being scrapped. To solve this problem, there are currently two existing methods: 1. Offline manual method: During work, it is necessary to manually sample the processed workpieces, compare them with the standard parts offline, calculate the deviation value, and then manually adjust the active measuring instrument to eliminate the dimensional deviation between the produced workpieces and the standard parts. The standard parts are used as reference parts for comparison and measurement of parts, that is, the workpieces that meet customer requirements.

[0004] 2. External inspection machine method: An external inspection machine is installed behind the machine tool with active measuring instrument to complete the random inspection of parts and the calculation of dimensional deviation instead of people, and then feedback is given to the machine tool to correct the feed parameters and eliminate the dimensional deviation.

[0005] Of the above two methods, the former has low work efficiency and the quality is difficult to control; the latter has high work efficiency but high cost. Summary of the invention

[0006] In view of the problems in the prior art, the present invention provides an online automatic calibration method for an active measuring instrument on a bearing grinder, aiming to improve work efficiency and reduce the calibration cost of the active measuring instrument.

[0007] An online automatic calibration method for an active measuring instrument on a bearing grinder comprises a bearing grinder and an active measuring instrument installed on the bearing grinder. A grinding station is arranged on the bearing grinder, the bearing grinder grinds a workpiece to be processed in the grinding station, and the active measuring instrument is used to measure the workpiece to be processed. The online automatic calibration method comprises the following steps: Step 1: Set up a calibration station on the bearing grinder and fix the standard parts in the calibration station; Step 2: Actively install the active measuring instrument on the bearing grinder, so that the measuring claw of the active measuring instrument moves between the grinding station and the calibration station and measures the workpiece to be processed and the standard part in both stations respectively; Step 3: Set a threshold value for the workpieces processed by the bearing grinder. When the count value of the processed workpiece does not reach the threshold value, place the measuring claw of the active measuring instrument at the grinding station and execute step 4. When the count value of the processed workpiece reaches the threshold value, place the measuring claw of the active measuring instrument at the calibration station and execute step 5. Step 4: Measure the workpiece to be processed by the active measuring instrument, and transmit the measurement data to the bearing grinder. The bearing grinder grinds the workpiece to be processed according to the measurement data, obtains the processed finished workpiece, and adds 1 to the count value of the processed workpiece; execute step 3: Step 5: Measure the standard workpiece through the active measuring instrument to obtain the measurement value, and determine whether the measurement 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 to zero and set the count value of the processed workpiece to zero at the same time, and execute step 3.

[0008] Further, the outer end faces of the standard part and the workpiece to be processed are located in the same plane.

[0009] Further: a driving device is fixedly installed at a position corresponding to the active measuring instrument on the bearing grinder, and the driving device includes a rotating mechanism and a telescopic mechanism that are connected to each other. The rotating mechanism is fixedly connected to the bearing grinder, and the rotating mechanism 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; wherein the rotating mechanism drives the active measuring instrument to intermittently swing back and forth between the grinding station and the calibration station via the telescopic mechanism, and the measuring claw of the active measuring instrument is made to jump into or out of the workpiece to be processed or the standard part through the telescopic mechanism.

[0010] Further: the rotating mechanism includes a rotating support sleeve and a servo motor both of which are fixedly connected to the bearing grinder, a rotating shaft is rotatably installed in the rotating support sleeve, the rotating shaft passes through the rotating support sleeve, one end of the rotating shaft is fixedly connected to the telescopic mechanism, and the active measuring instrument is fixedly connected to the telescopic mechanism; the other end of the rotating shaft is connected to the reducer, the reducer 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 through the reducer, the rotating shaft and the telescopic mechanism in turn.

[0011] Further: the telescopic mechanism includes a fixed seat fixedly connected to the rotating shaft, a telescopic cylinder and a guide rod are fixedly installed on the fixed seat, the telescopic direction of the telescopic cylinder and the long direction of the guide rod are 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.

[0012] Further: the limit position where the measuring claw of the active measuring instrument is driven by the telescopic cylinder to jump into the workpiece to be processed or the standard part is the first limit position, and a limit rod for limiting the first limit position is arranged on the fixed seat, and the limit rod is located between the fixed seat and the connecting plate and is stopped on the connecting plate.

[0013] Furthermore, a sensing switch for sensing that the telescopic cylinder is at the first limit position is arranged in the telescopic mechanism, and the sensing switch, the rotating mechanism and the telescopic mechanism are all connected to the controller of the bearing grinder.

[0014] Further: a V-shaped groove body for accommodating standard parts is arranged on the panel of the bearing grinder, one end of the V-shaped groove body is slidably arranged on the positioning rod, a positioning screw is arranged between the V-shaped groove body and the positioning rod, the positioning screw is used to position one end of the V-shaped groove on the positioning rod, the long direction of the positioning rod is arranged perpendicular to the axial direction of the swing of the active measuring instrument, and the opening of the V-shaped groove body is arranged upward.

[0015] Further, the threshold value is 1, so that a calibration is performed after processing a workpiece to be processed.

[0016] Further, the threshold value is greater than 1, so that interval calibration is performed.

[0017] The beneficial effects of the present invention are as follows: by utilizing the existing active measuring instrument, a calibration station for placing standard parts is added near the grinding station, so that the active measuring instrument can automatically switch between the grinding station and the calibration station to realize alternating processing and calibration; it is only necessary to partially modify the software of the active measuring instrument as required, and it can automatically reset to zero when receiving a signal, which effectively overcomes the shortcomings of the existing methods; the present invention can autonomously calibrate the active measuring instrument full-time, correct the dimensional drift of the instrument due to factors such as temperature changes and wear of the measuring claws, and can realize long-term stable measurement and control of the workpiece to be processed, so that the active measuring instrument itself forms a new fully closed-loop processing mode of processing + measurement + calibration + automatic control, breaking the traditional mode of manual inspection or external detection machine monitoring size, reducing labor and equipment costs, and the processing accuracy can also be maintained for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the bearing grinder in the present invention; Figure 2 It is a schematic diagram of the structure of the bearing grinder located at the calibration station; Figure 3 It is a cross-sectional structural schematic diagram of the driving device in the present invention; Figure 4 This is a diagram showing the coordination relationship among the driving device, active measuring instrument and workpiece in the present invention. DETAILED DESCRIPTION

[0019] The present invention is described in detail below in conjunction with the accompanying drawings. The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention. The directional terms such as left, middle, right, top, and bottom in the embodiments of the present invention are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0020] An online automatic calibration method for active measuring instruments on bearing grinding machines, such as Figure 1 As shown, it includes a bearing grinder 1 and an active measuring instrument 2 installed on the bearing grinder 1. A grinding station 11 is provided on the bearing grinder 1. The bearing grinder 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: Step 1: A calibration station 12 is set on the bearing grinder 1, and a standard part 4 is fixedly set in the calibration station 12, and the standard part 4 and the outer end surface of the workpiece 5 to be processed are located in the same plane; Figure 2 As shown, a V-shaped groove 41 for accommodating the standard part 4 is provided on the panel 13 of the bearing grinder 1, one end of the V-shaped groove 41 is slidably arranged on the positioning rod 42, a positioning screw (not shown in the figure) is arranged between the V-shaped groove 41 and the positioning rod 42, and the positioning screw is used to position one end of the V-shaped groove 41 on the positioning rod 42, the long direction of the positioning rod 42 is perpendicular to the axial direction of the swing of the active measuring instrument 2, and the opening of the V-shaped groove 41 is arranged upward; Step 2: Install the active measuring instrument 2 on the bearing grinder 1 and Figure 4 As shown, the measuring claw 21 of the active measuring instrument 2 is moved between the grinding station 11 and the calibration station 12 to measure the workpiece 5 to be machined and the standard part 4 in both stations respectively; Step 3: Set a threshold value for the workpiece processed by the bearing grinder 1, which is a positive integer. When the count value of the processed workpiece does not reach the threshold value, place the measuring claw 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 value, place the measuring claw 21 of the active measuring instrument 2 at the calibration station 12, and execute step 5; Step 4: The workpiece 5 to be processed is measured by the active measuring instrument 2, and the measurement data is transmitted to the bearing grinder 1. The bearing grinder 1 grinds the workpiece 5 to be processed according to the measurement data, obtains the processed finished workpiece, and adds 1 to the count value of the processed workpiece; execute step 3: Step 5: Measure the standard workpiece 4 through the active measuring instrument 2 to obtain the measurement value, and determine whether the measurement 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 amount of the active measuring instrument 2 to zero, and set the count value of the processed workpiece to zero at the same time, and execute step 3.

[0021] In this embodiment, when the threshold is 1, a calibration is performed after processing a workpiece 5 to be processed; in other embodiments, when the threshold is greater than 1, an interval calibration is performed.

[0022] Among them, a driving device 3 is fixedly installed on the bearing grinder 1 at the position corresponding to the active measuring instrument 2, combined with Figure 3 and Figure 4As shown, the driving device 3 includes a rotating mechanism and a telescopic mechanism connected to each other, the rotating mechanism is fixedly connected to the bearing grinder 1, the rotating mechanism is used to drive the telescopic mechanism to rotate, and the body of the active measuring instrument 2 is fixedly connected to the telescopic component of the telescopic mechanism; wherein, the rotating mechanism drives the active measuring instrument 2 to intermittently swing back and forth between the grinding station 11 and the calibration station 12 through the telescopic mechanism, and the measuring claw 21 of the active measuring instrument 2 jumps into or out of the workpiece 5 to be processed or the standard part 4 through the telescopic mechanism; the rotating mechanism includes a rotating support sleeve 33 and a servo motor 31, both of which are fixedly connected to the bearing grinder 1, a rotating shaft 39 is rotatably installed in the rotating support sleeve 33, the rotating shaft 39 passes through the rotating support sleeve 33, one end of the rotating shaft 39 is fixedly connected to the telescopic mechanism, and the active measuring instrument 2 is fixedly connected to the telescopic assembly of the telescopic mechanism. The other end of the rotating shaft 39 is connected to the reducer 32, the reducer 32 is fixedly mounted on the rotating support sleeve 33, the reducer 32 is connected to the servo motor 31, and the servo motor 31 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 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, the cylinder body of the telescopic cylinder 34 is slidably arranged on the guide rod 37, and the active measuring instrument 2 is fixedly connected to the cylinder body of the telescopic cylinder 34 through the connecting plate 35. In order to limit the depth of the measuring claw 21 jumping into the standard part 4 and the workpiece 5 to be processed, the limit position at which the telescopic cylinder 34 drives the measuring claw 21 of the active measuring instrument 2 to jump into the workpiece 5 to be processed or the standard part 4 is recorded as the first limit position, and a limit rod 36 for limiting the first limit position is arranged on the fixed seat 38. The limit 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 for sensing that the telescopic cylinder 34 is in the first limit position is arranged in the telescopic mechanism, and the induction switch 341, the rotating mechanism and the telescopic mechanism are all connected to the controller of the bearing grinder 1.

[0023] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An online automatic calibration method for an active measuring instrument on a bearing grinder, comprising a bearing grinder and an active measuring instrument installed on the bearing grinder, wherein a grinding station is provided on the bearing grinder, the bearing grinder grinds a workpiece to be processed in the grinding station, and the active measuring instrument is used to measure the workpiece to be processed, and the method is characterized in that: The online automatic calibration method includes the following steps: Step 1: Set up a calibration station on the bearing grinder and fix the standard parts in the calibration station; Step 2: Actively install the active measuring instrument on the bearing grinder, so that the measuring claw of the active measuring instrument moves between the grinding station and the calibration station and measures the workpiece to be processed and the standard part in both stations respectively; Step 3: Set a threshold value for the workpieces processed by the bearing grinder. When the count value of the processed workpiece does not reach the threshold value, place the measuring claw of the active measuring instrument at the grinding station and execute step 4. When the count value of the processed workpiece reaches the threshold value, place the measuring claw of the active measuring instrument at the calibration station and execute step 5. Step 4: Measure the workpiece to be processed by the active measuring instrument, and transmit the measurement data to the bearing grinder. The bearing grinder grinds the workpiece to be processed according to the measurement data, obtains the processed finished workpiece, and adds 1 to the count value of the processed workpiece; execute step 3: Step 5: Measure the standard workpiece through the active measuring instrument to obtain the measurement value, and determine whether the measurement 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 to zero and set the count value of the processed workpiece to zero at the same time, and execute step 3.

2. The online automatic calibration method of the active measuring instrument on the bearing grinding machine according to claim 1 is characterized in that: Make the outer end faces of the standard part and the workpiece to be processed in the same plane.

3. The online automatic calibration method of the active measuring instrument on the bearing grinding machine according to claim 1 or 2, characterized in that: A driving device is fixedly installed at a position corresponding to the active measuring instrument on the bearing grinder, and the driving device includes a rotating mechanism and a telescopic mechanism that are connected to each other. The rotating mechanism is fixedly connected to the bearing grinder, and the rotating mechanism is used to drive the telescopic mechanism to rotate. The main body of the active measuring instrument is fixedly connected to the telescopic component of the telescopic mechanism; wherein the rotating mechanism drives the active measuring instrument to intermittently swing back and forth between the grinding station and the calibration station through the telescopic mechanism, and the measuring claw of the active measuring instrument jumps into or out of the workpiece to be processed or the standard part through the telescopic mechanism.

4. The online automatic calibration method of the active measuring instrument on the bearing grinding machine according to claim 3 is characterized in that: The rotating mechanism includes a rotating support sleeve and a servo motor, both of which are fixedly connected to the bearing grinder. A rotating shaft is rotatably installed in the rotating support sleeve, and the rotating shaft passes through the rotating support sleeve. One end of the rotating shaft is fixedly connected to the telescopic mechanism, and the active measuring instrument is fixedly connected to the telescopic mechanism; the other end of the rotating shaft is connected to the reducer, and the reducer 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 through the reducer, the rotating shaft and the telescopic mechanism in turn.

5. The online automatic calibration method of the active measuring instrument on the bearing grinding machine according to claim 4 is characterized in that: The telescopic mechanism includes a fixed seat fixedly connected to the rotating shaft, on which a telescopic cylinder and a guide rod are fixedly installed. The telescopic direction of the telescopic cylinder and the long direction of the guide rod are 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, and the cylinder body of the telescopic cylinder is slidably arranged 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 of the active measuring instrument on the bearing grinding machine according to claim 5 is characterized in that: The limit position where the measuring claw of the active measuring instrument is driven by the telescopic cylinder to jump into the workpiece to be processed or the standard part is the first limit position. A limit rod for limiting the first limit position is arranged on the fixed seat. The limit rod is located between the fixed seat and the connecting plate and is stopped on the connecting plate.

7. The online automatic calibration method of the active measuring instrument on the bearing grinding machine according to claim 6 is characterized in that: An induction switch for sensing that the telescopic cylinder is at the first limit position is arranged in the telescopic mechanism. The induction switch, the rotating mechanism and the telescopic mechanism are all connected to the controller of the bearing grinder.

8. The online automatic calibration method of the active measuring instrument on the bearing grinding machine according to claim 3 is characterized by: A V-shaped groove body for accommodating standard parts is arranged on the panel of the bearing grinder, one end of the V-shaped groove body is slidably arranged on the positioning rod, a positioning screw is arranged between the V-shaped groove body and the positioning rod, the positioning screw is used to position one end of the V-shaped groove on the positioning rod, the long direction of the positioning rod is arranged perpendicular to the axial direction of the swing of the active measuring instrument, and the opening of the V-shaped groove body is arranged upward.

9. The online automatic calibration method of the active measuring instrument on the bearing grinding machine according to claim 1 is characterized in that: The threshold value is 1, so that a calibration is performed after processing a workpiece to be processed.

10. The online automatic calibration method of the active measuring instrument on the bearing grinding machine according to claim 1, characterized in that: The threshold is greater than 1, so that interval calibration is performed.

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