CN115256049A - Signal trigger stability measuring device and measuring method thereof - Google Patents

Abstract

The present invention provides a signal-triggered stability measurement device and a measurement method thereof, wherein the signal-triggered stability measurement device is used to detect a signal of a contact probe, including a fixing mechanism for vertically fixing the contact probe, and furthermore It includes: a support plate and a measuring mechanism, the support plate is arranged below the contact probe and is horizontally arranged, the measuring mechanism includes a reed, an adjustment table, a PZT piezoelectric ceramic and a displacement sensor, and the reed passes through the flexible The reed is connected to the support plate and is arranged relative to the contact probe, the spring plate is provided with a receiving groove along the horizontal direction, one end of the adjustment table is connected to the support plate, and the other end is inserted into the receiving plate. A groove, the PZT piezoelectric ceramic is arranged on the lifting end of the adjustment table and abuts against the inner wall of the accommodating groove. The signal trigger stability measuring device of the present invention can detect signals from different directions of the touch probe, so as to obtain the appropriate angle of the trigger stability signal of the touch probe.

Description

A signal trigger stability measuring device and its measuring method

technical field

The invention relates to the technical field of touch probes, in particular to a signal-triggered stability measurement device and a measurement method thereof.

Background technique

As an important part of the on-site measurement system of the machine tool, the contact probe is used to measure the geometric information of the workpiece. Its accuracy will directly affect the accuracy of the on-site measurement, and also directly affect the measurement accuracy, working performance, and use of precision measuring instruments. Efficiency and flexibility, whether precision measuring instruments can meet modern measurement requirements also depends on the continuous innovation and development of precision measuring head systems.

For example, the patent CN215035934U provides a contact-type one-way measuring device, which is composed of a support plate, an adapter plate, a guide rail, a slider, a sliding body, a pneumatic drive device, and a contact probe. The support plate is installed on the The moving component of the Z-axis of the machine tool can move up and down under the action of the Z-axis drive device; both the guide rail and the pneumatic drive device are installed on the support plate; the sliding body acts on the guide rail through the slider, and can move along the guide rail under the action of the pneumatic drive device. Move up and down; the touch probe is installed on the lower end of the sliding body, and can move up and down together with the sliding body; the touch probe is connected with the machine tool control device through the signal line, and transmits the measurement signal to the CNC system of the machine tool.

The touch probe is generally installed on the machine tool, which is similar to the above-mentioned patents. In actual use, when the installation position and direction of the touch probe are different, the displacement required to trigger the probe signal is also different. For some high For high-precision processing machine tools, it is necessary to ensure that the contact probe has high trigger accuracy and stability. However, because the pre-travel of the trigger signal of the probe is very small, it is difficult to measure with ordinary equipment. After that, the signal trigger accuracy and stability of the probe were not measured. Therefore, there is a need for a measuring device capable of measuring the trigger accuracy and trigger stability of the probe, so as to select the best measuring direction for the probe.

Contents of the invention

In view of this, it is necessary to provide a signal trigger stability measurement device and its measurement method, which solves the technical problem that the machine tool in the prior art cannot test the signal trigger accuracy and stability after the touch probe is installed.

In order to achieve the above technical objectives, the technical solution of the present invention provides a signal-triggered stability measuring device for detecting the signal of a touch probe, which includes: a support plate and a measuring mechanism, the support plate is set on the touch probe Below the probe and set horizontally, the measuring mechanism includes a reed, an adjustment table, a PZT piezoelectric ceramic and a displacement sensor, and the reed is connected to the support plate through a flexible piece and arranged relative to the contact probe. The reed is provided with an accommodation groove along the horizontal direction, one end of the adjustment platform is connected to the support plate, and the other end is inserted into the accommodation groove, and the PZT piezoelectric ceramic is arranged at the lifting end of the adjustment platform. In order for the adjustment table to drive the PZT piezoelectric ceramics to abut against the inner wall of the accommodation tank, the displacement sensor is connected to the support plate through the adjustment member and abuts against the bottom of the reed, and after the adjustment parts can adjust the position of the displacement sensor, so that the displacement sensor and the touch probe are arranged coaxially;

The reed can be lifted by the PZT piezoelectric ceramic until the touch probe outputs a stable signal, so that the displacement required by the touch probe to trigger the stable signal can be obtained through the displacement sensor.

Further, it also includes a lifting mechanism, the lifting mechanism is arranged between the support plate and the adjustment platform, and is used to adjust the height of the adjustment platform, the lifting mechanism includes a lifting frame, a horizontal plate and a driving end, The lifting frame is connected to the support plate, one end of the horizontal plate is connected to the lifting frame, and the other end is connected to the adjustment platform, and the driving end is arranged on the support plate and connected to the lifting frame , used to drive the elevating frame to drive the horizontal plate and the adjusting platform up and down.

Further, the adjustment platform is a micro-movement measurement platform.

Further, it also includes a support column, the support column is arranged vertically and is located between the flexible member and the support plate, and is used to support the reed and keep the reed in a suspended state.

Further, the flexible member is a double-arc flexible hinge, one end of the double-arc flexible hinge is connected to the support column, and the other end is connected to the reed, which is used to drive the reed to move along the vertical direction. move.

Further, the displacement sensor is a contact digital sensor.

Further, the adjustment member includes a fixed rod and a connecting rod, the fixed rod is vertically arranged on the support plate, one end of the connecting rod is provided with a fixing sleeve, and the other end is provided with a clamping part, and the connecting rod One end is rotatably connected to the fixed rod through the fixing sleeve, and the other end is detachably and fixedly connected to the touch digital sensor through the clamping part, so as to adjust the position and height of the touch digital sensor.

Further, the fixing rod is a screw rod, and the inner wall of the fixing sleeve is provided with an internal thread corresponding to the screw rod, so that the connecting rod is screwed to the screw rod.

The present invention also includes a signal-triggered stability measurement method, which includes the above-mentioned signal-triggered stability measurement device, and also includes the following steps:

Step 1. Adjust the position of the contact probe and the displacement sensor so that the measuring ball of the contact probe just touches the reed and is in a non-triggered state, so that the displacement sensor touches the lower surface of the reed and the displacement sensor The measuring direction is on the same axis as the measuring ball of the touch probe;

Step 2. Carry out the signal trigger test of the contact probe, drive the PZT piezoelectric ceramic and the reed to rise and produce contact displacement with the ball of the contact probe, and observe the signal triggering situation of the contact probe in real time until the touch probe triggers The signal is stable, and the data of the displacement sensor at the trigger time is recorded for backup;

Step 3, adjust the position of the touch probe and its corresponding displacement sensor, repeat the experimental operation of the above step 1 and step 2 and record the data;

Step 4: Analysis and processing of measurement data. Through data analysis of the stability of the triggering of the touch probe and the stability of the touch distance of the probe at different angles, the measurement angle with the best trigger stability is found, and this direction is recommended as the measurement angle. The installation direction when the head is detected.

Further, in step 1, the relative positions of the displacement sensor and the touch probe can be set according to Abbe's error principle.

Compared with the prior art, the beneficial effects of the present invention include: the measuring device of the present invention can be used to detect the stability of the trigger signal of the touch probe, and at the same time, the displacement sensor can detect when the touch probe triggers the stable signal. the amount of displacement required;

The measurement method provided by the present invention can quickly judge whether the contact probe meets the accuracy requirements through signal detection, so as to quickly find out the measurement direction with the highest precision, and use the optimal measurement angle of the contact probe to work effectively. Improve the measurement accuracy of the on-site measurement system of the machine tool, improve the efficiency of processing and product quality.

Description of drawings

Fig. 1 is the embodiment provided by the present invention-the assembly diagram of signal trigger stability measuring device;

Fig. 2 is an embodiment provided by the present invention - a schematic structural view of a signal trigger stability measurement device;

Fig. 3 is the embodiment provided by the present invention - the schematic structural view of the regulator in the signal trigger stability measurement device;

Fig. 4 is a schematic diagram of the operation flow of the signal trigger stability measurement method provided by the present invention.

Detailed ways

Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.

With reference to Fig. 1, the present invention provides a kind of signal triggering stability measurement device, is used for detecting the signal of touch probe 10, and it comprises: support plate 1 and measuring mechanism 2, and described support plate 1 is arranged on described touch probe Below the measuring head and set horizontally, the measuring mechanism 2 includes a reed 21, an adjustment platform 22, a PZT piezoelectric ceramic 23 and a displacement sensor 24, and the reed 21 is connected to the support plate 1 through a flexible piece 20 and is opposite to the The touch probe 10 is provided, the reed 21 is provided with an accommodation groove 211 along the horizontal direction, one end of the adjustment platform 22 is connected to the support plate 1, and the other end is inserted into the accommodation groove 211, the The PZT piezoelectric ceramic 23 is arranged on the lifting end of the adjustment platform 22, so that the adjustment platform 22 drives the PZT piezoelectric ceramic 23 to abut against the inner wall of the accommodation groove 211, and the displacement sensor 24 passes through the adjustment member 30 Connected to the support plate 1 and abutted against the bottom of the reed 21, the position of the displacement sensor 24 can be adjusted through the adjustment member 30, so that the displacement sensor 24 and the touch probe 10 axis settings. Among them, the touch probe 10 mainly includes a probe body, a stylus and a measuring ball. The stylus is fixed on the stylus, and the stylus is connected to the stylus body. When the workpiece has a certain displacement, the touch probe will send out a pulse signal. The touch probe is a common structure in the prior art, and will not be repeated here.

The touch probe 10 can be fixed vertically by a three-jaw chuck, and the measuring device is set relative to the measuring ball of the touch probe 10. The measuring mechanism 2 is installed on the support plate 1, and the reed can be lifted by PZT piezoelectric ceramics , until the touch probe 10 outputs a stable signal, then the displacement required for the touch probe 10 to trigger the stable signal is obtained through the displacement sensor 24, and the position of the probe is adjusted through the three-jaw chuck, and the displacement sensor 24 in the measuring mechanism Then the position can be adjusted by the adjusting member 30 so that the displacement sensor 24 is coaxially arranged with the measuring head, and then the measuring direction with the highest precision of the touch measuring head 10 can be found through multiple measurements at different angles.

In the embodiment provided by the present invention, the displacement sensor 24 is a contact digital sensor for measuring the displacement of the reed 21 .

In the embodiment provided by the present invention, the measuring device further includes a lifting mechanism 3, and the lifting mechanism 3 is arranged between the support plate 1 and the adjustment platform 22, and is used to adjust the height of the adjustment platform 22, so The lifting mechanism 3 includes a lifting frame 31, a horizontal plate 32 and a driving end (not shown in the figure), the lifting frame 31 is connected to the support plate 1, and one end of the horizontal plate 32 is connected to the lifting frame 31 , the other end is connected to the adjustment platform 22, the driving end is arranged on the support plate 1 and connected to the lifting frame 31, and is used to drive the lifting frame 31 to drive the horizontal plate 32 and the adjusting platform 22 lifting, used to cooperate with the adjustment platform 22 to complete the preliminary adjustment of the height of the PZT piezoelectric ceramics (this is the height adjustment in the macroscopic sense), so that the subsequent PZT piezoelectric ceramics can be connected to the external power supply to complete high-precision displacement adjustment (this is the microscopic sense) height adjustment above). Wherein, the adjustment table 22 is a micro-movement measuring bench, which is used to realize the height adjustment of the PZT piezoelectric ceramic 23 in the vertical direction. The micro-moving measuring bench is a common device in the prior art, and will not be repeated here.

In the embodiment provided by the present invention, the measuring device further includes a support column 4, which is vertically arranged and located between the flexible member 20 and the support plate 1, for supporting the reed 21 and Make the reed 21 in a suspended state. Wherein, the flexible member 20 is a double-arc flexible hinge, one end of the double-arc flexible hinge 20 is bolted to the support column 4, and the other end is connected to the reed 21 through a pin, which is used to drive the spring. The sheet 21 moves in the vertical direction.

In the embodiment provided by the present invention, the adjustment member 30 includes a fixed rod 301 and a connecting rod 302, the fixed rod 301 is vertically arranged on the support plate 1, and one end of the connecting rod 302 is provided with a fixing sleeve 3021, The other end is provided with a clamping portion 3022, one end of the connecting rod 302 is rotatably connected to the fixed rod 301 through the fixing sleeve, and the other end is detachably and fixedly connected to the contact digital sensor through the clamping portion 24, in order to adjust the position and height of the touch digital sensor 24. Among them, the fixed sleeve 3021 is used to adjust the position of the touch-type digital sensor 24 in the horizontal direction, and the clamping part 3022 can clamp and fix different positions of the touch-type digital sensor 24 according to needs, and is used to adjust the position of the touch-type digital sensor 24 in the vertical direction. The upper position, so as to keep the measurement direction of the touch digital sensor 24 and the measuring ball of the touch probe 10 on the same axis.

In the embodiment provided by the present invention, the fixing rod 301 is a screw rod, and the inner wall of the fixing sleeve 3021 is provided with an internal thread corresponding to the screw rod 301 , so that the connecting rod 302 is screwed to the screw rod 301 .

The present invention also includes a signal-triggered stability measurement method, which includes the above-mentioned signal-triggered stability measurement device, and also includes the following steps:

Step 1. Adjust the position of the contact probe and the displacement sensor so that the measuring ball of the contact probe just touches the reed and is in a non-triggered state, so that the displacement sensor touches the lower surface of the reed and the displacement sensor The measurement direction is on the same axis as the measuring ball of the touch probe; specifically, before the experiment starts, the touch probe and the measuring device are installed and fixed in sequence, and the lifting mechanism and the micro-motion measuring bench are used to adjust the position of the reed. position, so that the measuring ball of the contact probe just touches the reed and is in the state of no triggering, the movement displacement required by the micro-motion measuring bench is the theoretical movement distance, and then adjust the position of the displacement sensor so that the displacement sensor touches the The lower surface of the reed produces a certain displacement value, ensuring that the displacement value is greater than the displacement value required when the touch probe is triggered. It can make the measurement direction of the displacement sensor and the measurement direction of the touch probe according to the principle of the minimum Abbe error. The balls are on the same axis.

Step 2. Carry out the signal trigger test of the contact probe. The PZT piezoelectric ceramic drives the reed to rise and generate contact displacement with the ball of the contact probe, and observe the signal triggering situation of the contact probe in real time until the contact probe is triggered. The signal is stable, and the data of the displacement sensor at the trigger time is recorded for backup; specifically, the reed is driven up by the micro-motion measurement bench to generate a contact displacement with the measuring ball, and the reed realizes the synchronization of the upper and lower surfaces through the small deformation of the double-arc flexible hinge itself Displacement, the lower surface of the reed rises, so that the displacement data of the displacement sensor decreases slowly. When the PZT piezoelectric ceramic is driven, observe the signal triggering of the contact probe in real time. When the signal of the contact probe is triggered, stop driving and wait for a few seconds. Finally, observe whether the trigger signal of the contact probe is stable. If the trigger signal of the probe is stable, record the displacement sensor data at this time and reset the macro-motion experimental platform; if the trigger signal of the contact probe is unstable, continue to generate displacement through the PZT piezoelectric ceramic Until the trigger signal is stable, when the probe trigger signal is stable, record the data of the displacement sensor at the trigger time for future use.

Step 3: Adjust the position of the touch probe and its corresponding displacement sensor, and clamp and loosen the touch probe through the three-jaw chuck, so that the touch probe can rotate in the horizontal direction. The primary rotation angle is 20°-40°. After each rotation of the touch probe, repeat the experimental operation of the above step 1 and step 2 and record the data.

Step 4: Analysis and processing of measurement data. Through data analysis of the stability of the triggering of the touch probe and the stability of the touch distance of the probe at different angles, the measurement angle with the best trigger stability is found, and this direction is recommended as the measurement angle. The installation direction when the head is detected. Specifically, record the data of the displacement sensor before the experiment as x ₁ , and the data of the displacement sensor when the trigger signal of the touch probe is stable is x ₂ , and the difference between the two (x ₁ -x ₂ ) is the signal of the touch probe The displacement required for stable triggering, multiple repeated experimental data measured in different directions of the probe is a group, and the data of multiple measurements are calculated by formulas (1), (2) and (3) after removing data outliers The range, variance and standard deviation of the data in this group.

R＝x _max -x _min (1)

Among them, x represents the average number of samples, n represents the number of samples, xi represents the individual, and the data in other directions measured by the probe are processed in the same way to obtain the range, variance and standard deviation. By comparing the data in different directions, the optimal measurement angle of the probe can be found, and this direction is recommended as the installation direction of the probe during detection.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of changes or modifications within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention.

Claims (10)

1. A signal-triggered stability measurement device, used to detect the signal of a touch probe, including a fixing mechanism for vertically fixing the touch probe, is characterized in that it also includes: a support plate and a measuring mechanism, the The support plate is arranged below the touch probe and arranged horizontally. The measuring mechanism includes a reed, an adjustment platform, a PZT piezoelectric ceramic and a displacement sensor. The reed is connected to the support plate through a flexible piece and is opposite to the The contact measuring head is set, the reed is provided with an accommodation groove along the horizontal direction, one end of the adjustment table is connected to the support plate, and the other end is inserted into the accommodation groove, and the PZT piezoelectric ceramic is arranged on the The lifting end of the adjustment platform, so that the adjustment platform drives the PZT piezoelectric ceramics to abut against the inner wall of the accommodating tank, and the displacement sensor is connected to the support plate through an adjustment piece and abuts against the spring The bottom of the sheet, the position of the displacement sensor can be adjusted through the adjustment member, so that the displacement sensor and the touch probe are arranged coaxially; The reed can be lifted by the PZT piezoelectric ceramic until the touch probe outputs a stable signal, so that the displacement required by the touch probe to trigger the stable signal can be obtained through the displacement sensor. 2. The signal-triggered stability measurement device according to claim 1, characterized in that: it also includes a lifting mechanism, and the lifting mechanism is arranged between the support plate and the adjustment table for adjusting the adjustment table The height of the lifting mechanism includes a lifting frame, a horizontal plate and a driving end, the lifting frame is connected to the support plate, one end of the horizontal plate is connected to the lifting frame, and the other end is connected to the adjustment table, The driving end is arranged on the supporting plate and connected to the lifting frame, and is used to drive the lifting frame to drive the horizontal plate and the adjusting table to rise and fall. 3 . The signal-triggered stability measurement device according to claim 2 , wherein the adjustment platform is a micro-motion measurement platform. 4 . 4. The signal-triggered stability measurement device according to claim 1, characterized in that: it also includes a support column, the support column is vertically arranged and located between the flexible member and the support plate, for supporting the Described reed and make described reed be in suspended state. 5. The signal-triggered stability measurement device according to claim 4, characterized in that: the flexible member is a double-arc flexible hinge, one end of the double-arc flexible hinge is connected to the support column, and the other end is connected to The reed is used to drive the reed to move vertically. 6. The signal-triggered stability measuring device according to claim 1, wherein the displacement sensor is a contact digital sensor. 7. The signal-triggered stability measurement device according to claim 1, characterized in that: the adjustment member includes a fixed rod and a connecting rod, the fixed rod is vertically arranged on the support plate, and one end of the connecting rod A fixed sleeve is provided, and the other end is provided with a clamping part. One end of the connecting rod is rotatably connected to the fixed rod through the fixed sleeve, and the other end is detachably fixedly connected to the contact type through the clamping part. digital sensor to adjust the position and height of the touch digital sensor. 8. The signal-triggered stability measurement device according to claim 7, characterized in that: the fixed rod is a screw, and the inner wall of the fixed sleeve is provided with an internal thread corresponding to the screw, so that the connecting rod threadedly connected to the screw. 9. A signal trigger stability measurement method, comprising the signal trigger stability measurement device according to claim 1-8, characterized in that: Including the following steps: Step 1. Adjust the position of the contact probe and the displacement sensor so that the measuring ball of the contact probe just touches the reed and is in a non-triggered state, so that the displacement sensor touches the lower surface of the reed and the displacement sensor The measuring direction is on the same axis as the measuring ball of the touch probe; Step 2. Carry out the signal trigger test of the contact probe, drive the PZT piezoelectric ceramic and the reed to rise and produce contact displacement with the ball of the contact probe, and observe the signal triggering situation of the contact probe in real time until the touch probe triggers The signal is stable, and the data of the displacement sensor at the trigger time is recorded for backup; Step 3, adjust the position of the touch probe and its corresponding displacement sensor, repeat the experimental operation of the above step 1 and step 2 and record the data; Step 4: Analysis and processing of measurement data. Through data analysis of the stability of the triggering of the touch probe and the stability of the touch distance of the probe at different angles, the measurement angle with the best trigger stability is found, and this direction is recommended as the measurement angle. The installation direction when the head is detected. 10 . The signal-triggered stability measurement method according to claim 9 , wherein in step 1, the relative positions of the displacement sensor and the touch probe can be set according to the Abbe error principle. 11 .

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