CN216000073U - Quick tool setting device for grinding internal thread of lead screw nut - Google Patents
Quick tool setting device for grinding internal thread of lead screw nut Download PDFInfo
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- CN216000073U CN216000073U CN202121921665.8U CN202121921665U CN216000073U CN 216000073 U CN216000073 U CN 216000073U CN 202121921665 U CN202121921665 U CN 202121921665U CN 216000073 U CN216000073 U CN 216000073U
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Abstract
The utility model relates to a lead screw nut internal thread grinding rapid tool setting device.A sound emission sensor consists of a rotating part and a stator part; the rotor part comprises a piezoelectric measuring head of the acoustic emission sensor and an electric signal transmission end, the rotor part is arranged in the grinding wheel spindle and rotates along with the grinding wheel spindle, and the piezoelectric measuring head of the acoustic emission sensor is close to one end of the grinding wheel; the stator part is arranged at one side close to the signal transmission end of the rotor part, and the acoustic emission sensor is connected with the numerical control system of the machine tool through a signal processor and is used for inputting acoustic emission signals into the numerical control system of the machine tool after passing through the signal processor. According to the utility model, the automatic and rapid tool setting in the grinding process of the internal thread of the screw nut is realized by measuring the acoustic emission signal in real time, the high-precision processing requirement of the screw nut can be met, and the method has important significance for improving the grinding efficiency and the grinding quality of the screw nut. The screw nut internal thread tool setting device has a good application effect in grinding and can also be applied to turning and milling.
Description
Technical Field
The utility model relates to a quick tool setting device for grinding internal threads of a lead screw nut.
Background
In recent years, with the development of grinding technology towards high precision and high efficiency, higher requirements on grinding tool setting are put forward to guarantee the grinding quality. Particularly, in the grinding process of the internal thread of the screw nut, if the grinding wheel is not well adjusted in tool relative to the internal thread of the screw nut, the processing allowances on the two side surfaces of the grinding wheel are unequal, and the large allowance side bears larger grinding force than the small allowance side during grinding, so that the grinding quality of the surface of a workpiece and the service life of the grinding wheel are seriously influenced. The traditional experience methods have the advantages that the detection precision is low by listening to grinding sound or seeing grinding sparks, and the experience methods are difficult to apply to the internal thread grinding tool setting process, so that how to effectively realize quick and high-precision tool setting of the lead screw nut internal thread grinding has important significance for improving the grinding efficiency and the grinding quality of the lead screw nut internal thread grinding tool setting. Acoustic Emission (AE) is a phenomenon in which energy is released in the form of elastic waves when a material is deformed or broken by an external or internal force. During grinding, when the grinding wheel is in contact with the workpiece, the contact state thereof can be reflected by the AE signal. Based on the principle, the utility model provides a quick tool setting device for grinding the internal thread of the screw nut. The device can automatically determine the center tool setting position of the grinding wheel and the internal thread of the screw nut, and obtains better application effect.
Disclosure of Invention
The utility model provides a quick tool setting device for grinding an internal thread of a lead screw nut, which aims to realize quick and high-precision tool setting in the process of grinding the internal thread of the lead screw nut, meet the high-precision processing requirement of the lead screw nut and effectively improve the grinding efficiency and the grinding quality of the internal thread of the lead screw nut.
In order to achieve the purpose, the utility model adopts the technical scheme that: a lead screw nut internal thread grinding rapid tool setting device comprises an acoustic emission sensor, wherein the acoustic emission sensor consists of a rotating part and a stator part; the rotor part comprises a piezoelectric measuring head of the acoustic emission sensor and an electric signal transmission end, and is arranged in the grinding wheel spindle and rotates along with the grinding wheel spindle, wherein the piezoelectric measuring head of the acoustic emission sensor is close to one end of the grinding wheel; the acoustic emission sensor is connected with the numerical control system of the machine tool through a signal processor and is used for inputting acoustic emission signals into the numerical control system of the machine tool after passing through the signal processor.
Further, the rotor part is connected with the grinding wheel spindle through threads.
Furthermore, the rotor part transmits the acoustic emission signals to the stator part in a wireless transmission mode, and the acoustic emission signals enter the control display device after being conditioned by the signal processor.
Further, the signal processor adopts a Chebyshev I-type digital filter to perform low-pass filtering processing on the acquired data.
Further, in the grinding tool setting process, once the grinding wheel contacts a workpiece and is ground, the acoustic emission sensor inputs a detected signal of which the change of the RMS value of the measured signal exceeds a preset threshold value H into a machine tool numerical control system, and the machine tool numerical control system outputs a control signal to the grinding feeding mechanism so that the grinding feeding mechanism immediately stops feeding movement in the X-axis direction.
Further, when the numerical control system of the machine tool executes a quick tool setting function, the grinding wheel (5) moves to a position H away from the bottom end of the nut thread in the X-axis negative direction, the numerical control system of the machine tool inputs a control signal obtained by carrying out digital filtering on an acoustic emission signal acquired in real time and comparing the signal with a set RMS threshold value H to the grinding feeding mechanism, and the grinding feeding mechanism drives the grinding wheel to move in the Z-axis positive direction until the grinding wheel contacts the right side surface of the thread in the workpiece to grind.
Further, when the acoustic emission sensor detects that the change of the RMS value of the measured signal exceeds a preset threshold value H, the machine tool numerical control system outputs a control signal to the grinding and feeding mechanism, so that the grinding and feeding mechanism immediately stops feeding movement in the Z-axis direction, and the coordinates of the point are recorded: x1, Z1.
Further, when the grinding wheel moves towards the Z-axis negative direction until the grinding wheel is in contact with the left side surface of the thread in the workpiece to be ground, and the acoustic emission sensor detects that the change of the RMS of the measured signal exceeds a preset threshold value H, the machine tool numerical control system outputs a control signal to the grinding feeding mechanism, so that the grinding feeding mechanism immediately stops the feeding motion in the Z-axis direction, and the coordinates of the point are recorded: x1, Z2.
The utility model has the beneficial effects that:
according to the utility model, the automatic and rapid tool setting in the grinding process of the internal thread of the screw nut is realized by measuring the acoustic emission signal in real time, the high-precision processing requirement of the screw nut can be met, and the method has important significance for improving the grinding efficiency and the grinding quality of the screw nut. The screw nut internal thread tool setting device has a good application effect in grinding and can also be applied to turning and milling.
Drawings
FIG. 1 is a composition diagram of an acoustic emission sensor;
FIG. 2 is a schematic view of grinding of the internal threads of the lead screw nut and sensor installation;
FIG. 3 is a schematic view of rapid tool setting for thread grinding;
in the figure: 1-acoustic emission sensor rotor part, 2-acoustic emission sensor stator part, 3-spindle housing, 4-grinding wheel spindle, 5-grinding wheel, 6-grinding workpiece screw nut, 7-workpiece fixture, 8-workpiece spindle, 9-acoustic emission signal processor, 10-machine tool numerical control system.
Detailed Description
The utility model is further described with reference to the following figures and examples.
The utility model provides a lead screw nut internal thread grinding rapid tool setting device, wherein an acoustic emission sensor is used, as shown in figure 1, and consists of a rotating part 1 and a stator part 2; the rotor part 1 of the acoustic emission sensor comprises a piezoelectric measuring head 1-1 of the acoustic emission sensor and an electric signal transmission end 1-2, acoustic emission is transmitted to a stator part 2 of the acoustic emission sensor in a wireless transmission mode, and then the acoustic emission signal enters a control display device after being conditioned by a signal processor. As shown in fig. 2, the rotor part 1 of the acoustic emission sensor is installed in the grinding wheel spindle and rotates along with the grinding wheel spindle through threads Ma8 and Ma10 in the acoustic emission sensor, wherein a piezoelectric measuring head of the acoustic emission sensor is close to one end of the grinding wheel; the acoustic emission sensor stator part 2 is then mounted close to the signal transmission end side at the acoustic emission sensor rotor part 1. The acoustic emission signal enters a machine tool numerical control system 10 after passing through a signal processor 9.
In order to remove the influence of high-frequency interference signals such as environment temperature, electromagnetic environment and the like on experimental measurement results, the utility model uses a Chebyshev I-type digital filter to perform low-pass filtering processing on the acquired data.
Based on the acoustic emission signal Root Mean Square (RMS) tool setting principle: during grinding, when the grinding wheel is in contact with a workpiece, the contact state of the grinding wheel can be reflected by an acoustic emission signal. In order to realize micron-level and submicron-level tool setting accuracy, the utility model presets the RMS threshold value H of an acoustic emission signal at different grinding depths; in the grinding tool setting process, once the grinding wheel 5 contacts the workpiece (6) for grinding, when the acoustic emission sensor detects that the change of the RMS value of a measured signal exceeds a preset threshold value H, the numerical control system immediately stops the feed motion in the X-axis direction, namely, the grinding wheel is considered to be in contact with the workpiece. Due to the structural characteristics of the screw threads of the screw rod and the nut, the method for realizing high-precision tool alignment comprises the following steps: when the numerical control system executes the quick tool setting function, as shown in fig. 3, the grinding wheel 5 moves to a position H away from the bottom end of the nut thread in the X negative direction by F (mm/min), and the tool setting subroutine acquires an acoustic emission signal in real time, performs digital filtering and compares the acoustic emission signal with a set RMS threshold value H; then the grinding wheel 5 moves in the positive Z direction at the speed of F1(mm/min) until the grinding wheel 5 contacts the right side surface of the thread in the workpiece 6 and grinding occurs, and when the acoustic emission sensor detects that the change of the RMS value of the measured signal exceeds a predetermined threshold value H, the numerical control system immediately stops the feed motion in the Z direction and records the coordinates of the point (X1, Z1). In the same way, the grinding wheel 5 moves towards the negative Z direction at the speed F1(mm/min) until the grinding wheel 5 contacts the left side surface of the thread in the workpiece 6 and grinding occurs, and when the acoustic emission sensor detects that the change of the measured signal RMS value exceeds the preset threshold value H, the numerical control system immediately stops the feed motion in the Z direction and records the coordinates of the point (X1, Z2). Finally, the tool setting subroutine calculates the position of the center of the grinding wheel tool setting: and Z0 is (Z1+ Z2)/2, the grinding wheel moves to a coordinate position (X1, Z0) at a speed F1(mm/min), namely the tool setting center coordinate of the grinding wheel is obtained, and the automatic tool setting process of the grinding wheel is finished.
The specific embodiment of the utility model:
1) the acoustic emission sensor used in the present embodiment, as shown in fig. 1, is composed of a rotating portion 1 and a stator portion 2; the rotor part 1 of the acoustic emission sensor comprises a piezoelectric measuring head of the acoustic emission sensor and an electric signal transmission end, acoustic emission is transmitted to the stator part 2 of the acoustic emission sensor in a wireless transmission mode, and then the acoustic emission signal enters the control display device after being conditioned by the signal processor.
As shown in fig. 2, the rotor part 1 of the acoustic emission sensor is installed in the grinding wheel spindle and rotates along with the grinding wheel spindle through threads Ma8 and Ma10 in the acoustic emission sensor, wherein a piezoelectric measuring head of the acoustic emission sensor is close to one end of the grinding wheel; the acoustic emission sensor stator part 2 is then mounted close to the signal transmission end side at the acoustic emission sensor rotor part 1. The acoustic emission signal enters a machine tool numerical control system 10 after passing through a signal processor 9.
2) Acoustic emission signal preprocessing: setting the sampling frequency of the signal to fsAnd the whole measuring device is ensured to work normally after debugging. After the experiment begins, the grinding carriage spindle is started to rotate at a rotating speed Vs(r/min) rotating at a workpiece rotating speed of Vw(r/min). In order to remove the influence of high-frequency interference signals such as environment temperature, electromagnetic environment and the like on experimental measurement results, the utility model uses a Chebyshev I-type digital filter to perform low-pass filtering processing on acquired data, and the specific method principle is as follows.
The n-order magnitude square function of the Chebyshev type I filter is as follows (1)
Wherein:
|ε|<1, representing the degree of amplitude fluctuation within the pass band; omega0Is the passband cutoff frequency; while
Is the filter at the cut-off frequency omega0The magnification of (3).
determining the cut-off frequency omega of the low-pass filter by analyzing the frequency components of the acquired displacement signal and force signal0Parameter epsilon and order n.
3) Based on the acoustic emission signal Root Mean Square (RMS) tool setting principle: during grinding, when the grinding wheel is in contact with a workpiece, the contact state of the grinding wheel can be reflected by an acoustic emission signal. In order to realize micron-level and submicron-level tool setting accuracy, the utility model sets the RMS threshold value H of the acoustic emission signal at different grinding depths in advance; in the grinding tool setting process, once the grinding wheel 5 contacts the workpiece 6 for grinding, when the acoustic emission sensor detects that the change of the RMS value of the measured signal exceeds a preset threshold value H, the numerical control system immediately stops the feed motion in the X-axis direction, namely, the grinding wheel is considered to contact the workpiece.
4) Due to the structural characteristics of the screw threads of the screw rod and the nut, the method for realizing high-precision tool alignment comprises the following steps: when the numerical control system executes the quick tool setting function, as shown in fig. 3, the grinding wheel 5 moves to a position H away from the bottom end of the nut thread in the X negative direction by F (mm/min), and the tool setting subroutine acquires an acoustic emission signal in real time, performs digital filtering and compares the acoustic emission signal with a set RMS threshold value H; then the grinding wheel 5 moves in the positive Z direction at the speed of F1(mm/min) until the grinding wheel 5 contacts the right side surface of the thread in the workpiece 6 and grinding occurs, and when the acoustic emission sensor detects that the change of the RMS value of the measured signal exceeds a predetermined threshold value H, the numerical control system immediately stops the feed motion in the Z direction and records the coordinates of the point (X1, Z1). In the same way, the grinding wheel 5 moves towards the negative Z direction at the speed F1(mm/min) until the grinding wheel 5 contacts the left side surface of the thread in the workpiece 6 and grinding occurs, and when the acoustic emission sensor detects that the change of the measured signal RMS value exceeds the preset threshold value H, the numerical control system immediately stops the feed motion in the Z direction and records the coordinates of the point (X1, Z2). Finally, the tool setting subroutine calculates the position of the center of the grinding wheel tool setting: and Z0 is (Z1+ Z2)/2, the grinding wheel moves to a coordinate position (X1, Z0) at a speed F1(mm/min), namely the tool setting center coordinate of the grinding wheel is obtained, and the automatic tool setting process of the grinding wheel is finished.
Claims (8)
1. The utility model provides a quick tool setting device of lead screw nut internal thread grinding which characterized in that: the device comprises an acoustic emission sensor, wherein the acoustic emission sensor consists of a rotating part and a stator part; the rotor part comprises a piezoelectric measuring head of the acoustic emission sensor and an electric signal transmission end, and is arranged in the grinding wheel spindle and rotates along with the grinding wheel spindle, wherein the piezoelectric measuring head of the acoustic emission sensor is close to one end of the grinding wheel; the acoustic emission sensor is connected with the numerical control system of the machine tool through a signal processor and is used for inputting acoustic emission signals into the numerical control system of the machine tool after passing through the signal processor.
2. The lead screw nut internal thread grinding rapid tool setting device of claim 1, characterized in that: the rotor part is connected with the grinding wheel spindle through threads.
3. The lead screw nut internal thread grinding rapid tool setting device of claim 1, characterized in that: the rotor part transmits acoustic emission signals to the stator part in a wireless transmission mode, and the acoustic emission signals enter the control display device after being conditioned by the signal processor.
4. The lead screw nut internal thread grinding rapid tool setting device of claim 3, characterized in that: and the signal processor adopts a Chebyshev I-type digital filter to perform low-pass filtering processing on the acquired data.
5. The lead screw nut internal thread grinding rapid tool setting device of claim 1, characterized in that: in the grinding tool setting process, once a grinding wheel contacts a workpiece and is ground, the acoustic emission sensor inputs a detected signal of which the change of the RMS value of the measured signal exceeds a preset threshold value H into a machine tool numerical control system, and the machine tool numerical control system outputs a control signal to a grinding feeding mechanism to enable the grinding feeding mechanism to immediately stop feeding movement in the X-axis direction.
6. The lead screw nut internal thread grinding rapid tool setting device of claim 1, characterized in that: when a machine tool numerical control system executes a quick tool setting function and a grinding wheel (5) rapidly moves to a position H away from the bottom end of a nut thread in the X-axis negative direction, the machine tool numerical control system carries out digital filtering on an acoustic emission signal acquired in real time and inputs a control signal after comparison and calculation with a set RMS threshold value H to a grinding feeding mechanism, and the grinding feeding mechanism drives the grinding wheel to move in the Z-axis positive direction until the grinding wheel contacts the right side surface of the thread in a workpiece to be ground.
7. The lead screw nut internal thread grinding rapid tool setting device of claim 1, characterized in that: when the acoustic emission sensor detects that the change of the measured signal RMS value exceeds a preset threshold value H, the machine tool numerical control system outputs a control signal to the grinding feeding mechanism, so that the grinding feeding mechanism immediately stops feeding movement in the Z-axis direction, and the coordinates of the point are recorded: x1, Z1.
8. The lead screw nut internal thread grinding rapid tool setting device of claim 1, characterized in that: when the grinding wheel moves towards the Z-axis negative direction until the grinding wheel is in contact with the left side surface of the thread in the workpiece and is ground, and the acoustic emission sensor detects that the change of the RMS of the measured signal exceeds a preset threshold value H, the machine tool numerical control system outputs a control signal to the grinding feeding mechanism, so that the grinding feeding mechanism immediately stops feeding movement in the Z-axis direction, and the coordinates of the point are recorded: x1, Z2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121921665.8U CN216000073U (en) | 2021-08-16 | 2021-08-16 | Quick tool setting device for grinding internal thread of lead screw nut |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121921665.8U CN216000073U (en) | 2021-08-16 | 2021-08-16 | Quick tool setting device for grinding internal thread of lead screw nut |
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| CN216000073U true CN216000073U (en) | 2022-03-11 |
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| CN202121921665.8U Active CN216000073U (en) | 2021-08-16 | 2021-08-16 | Quick tool setting device for grinding internal thread of lead screw nut |
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- 2021-08-16 CN CN202121921665.8U patent/CN216000073U/en active Active
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