CN215999763U - Workpiece rigidity online measuring device in excircle plunge grinding - Google Patents
Workpiece rigidity online measuring device in excircle plunge grinding Download PDFInfo
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- CN215999763U CN215999763U CN202121919062.4U CN202121919062U CN215999763U CN 215999763 U CN215999763 U CN 215999763U CN 202121919062 U CN202121919062 U CN 202121919062U CN 215999763 U CN215999763 U CN 215999763U
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Abstract
The utility model relates to an online measuring device for workpiece rigidity in excircle plunge grinding, wherein a three-way force sensor is arranged in a tailstock center, the tailstock center is arranged in a tailstock of a machine tool, two eddy current displacement sensors are respectively arranged at a position h away from a contact area between a grinding wheel and a workpiece by using a magnetic gauge stand and are mutually vertical, and the eddy current displacement sensors and the three-way force sensor are respectively connected with an A/D acquisition card and a computer after passing through an eddy current sensor signal processor and a force sensor signal processor. The utility model can measure the rigidity of the workpiece at any time in the excircle plunge grinding process in real time. The rigidity of the workpiece is measured through experiments, so that the center clamping force, the rigidity of the machine tool headstock and the rigidity of the machine tool tailstock can be guided to be adjusted to meet the machining production requirements, and in the actual grinding process, grinding process parameters can be optimized according to measured data, so that the method has important significance for improving the grinding efficiency and the grinding quality.
Description
Technical Field
The utility model relates to an online measuring device for workpiece rigidity in cylindrical plunge grinding.
Background
In recent years, with the development of grinding technology toward high precision and high efficiency, higher requirements are put on the rigidity of a grinding workpiece for ensuring the grinding quality. Particularly in the excircle grinding processing, a plurality of grinding workpiece clamping modes are realized by two centers, and the rigidity of the grinding workpiece is influenced by the rigidity of the two centers and the magnitude of the jacking force and also influenced by the rigidity of a machine tool headstock and a machine tool tailstock. The rigidity of the grinding workpiece directly affects the final processing quality of the workpiece, and the grinding processing flutters and even damages a machine tool when the rigidity is serious. Due to the characteristics of the excircle plunge type grinding process, the rigidity of the workpiece in the grinding process is difficult to realize on-line measurement. Therefore, how to effectively measure the rigidity of the excircle cut-in type grinding workpiece on line has important significance for improving the grinding efficiency and the grinding quality. The utility model can accurately measure the rigidity of the excircle plunge type grinding workpiece on line by using the high-precision eddy current sensor and the three-way force sensor, obtains good effect and provides reliable data for the structural design of a machine tool and the adjustment of grinding process parameters.
Disclosure of Invention
In order to realize the online measurement device of the rigidity of the workpiece in the cylindrical plunge grinding, provide measurement data for the structural design of a machine tool and the adjustment of grinding process parameters, and effectively improve the grinding efficiency and the grinding quality, the utility model provides the online measurement device of the rigidity of the workpiece in the cylindrical plunge grinding.
In order to achieve the purpose, the utility model adopts the technical scheme that: the device comprises a three-way force sensor, an eddy current displacement sensor signal processor, an A/D acquisition card and a computer, wherein the three-way force sensor is installed in a tailstock center, the tailstock center is installed in a tailstock of a machine tool, the two eddy current displacement sensors are installed at a position h away from a contact area of a grinding wheel and a workpiece by magnetic gauge stands respectively, the two eddy current displacement sensors are perpendicular to each other, and the eddy current displacement sensor and the three-way force sensor are connected with the A/D acquisition card and the computer after passing through the eddy current sensor signal processor and the force sensor signal processor respectively.
Furthermore, one eddy current displacement sensor is parallel to the feeding direction of the grinding wheel, and the other eddy current displacement sensor is perpendicular to the worktable of the machine tool.
Furthermore, the measurement accuracy of the eddy current displacement sensor is less than 0.1um and the protection grade is more than IP 65.
Further, the eddy current sensor signal processor and the force sensor signal processor adopt a Chebyshev I-type digital filter to perform low-pass filtering processing on the acquired data.
The utility model has the beneficial effects that:
the utility model can measure the rigidity of the workpiece at any time in the excircle plunge grinding process in real time. The rigidity of the workpiece is measured through experiments, so that the center clamping force, the rigidity of the machine tool headstock and the rigidity of the machine tool tailstock can be guided to be adjusted to meet the machining production requirements, and in the actual grinding process, grinding process parameters can be optimized according to measured data, so that the method has important significance for improving the grinding efficiency and the grinding quality.
Drawings
FIG. 1 is a schematic diagram of a grinding workpiece stiffness measurement;
in the figure: 1-grinding wheel, 2-grinding wheel spindle, 3-grinding wheel spindle box, 4-workpiece, 5-machine tool headstock, 6-headstock finial, 7-tailstock finial, 8-force sensor, 9-machine tool tailstock, 10-eddy current sensor, 11-signal processor, 12-signal processor, 13-A/D acquisition card, 14-computer, 15-eddy current displacement sensor and 16-grinding wheel flange.
Detailed Description
The utility model is further described with reference to the following figures and examples.
The three-way force sensor used in the utility model is a transducer which converts force into charge by utilizing the piezoelectric effect of quartz crystal, the charge generated by the sensor is in direct proportion to the external force to be measured, the charge is converted into voltage in proportion by a charge amplifier, and the size and the change of the voltage are read by other displays. Since quartz is very rigid and the displacement under force is small, typically within a few microns, this measurement with almost no displacement has very little error for slow quasi-static processes. For measurements with fast processes, the advantages of quartz are incomparable with other measurement methods due to its high stiffness and the high natural frequency associated with it. Therefore, the sensor is very suitable for measuring quasi-static force and dynamic force on various mechanical equipment.
The online measuring device for the rigidity of the workpiece in the excircle plunge grinding of the embodiment specifically combines and applies the following methods:
1) as shown in figure 1, a machine tool tailstock center 7 needs to be modified, a three-way force sensor 8 is installed in the tailstock center 7, and then the tailstock center 7 is installed in a machine tool tailstock 9. Selecting an eddy current displacement sensor with the measurement accuracy of less than 0.1um and the protection level of IP65 (waterproof) or more, installing the eddy current sensor 10 and the eddy current displacement sensor 15 to a contact area close to a grinding wheel and a workpiece by using a magnetic gauge stand, enabling the eddy current sensor 10 and the eddy current displacement sensor 15 to be perpendicular to each other, wherein the eddy current sensor 10 is parallel to the feeding direction of the grinding wheel and the direction of the eddy current displacement sensor 15 to be perpendicular to a machine tool workbench, and finally adjusting the distance between a measuring head of the eddy current displacement sensor and the surface of the workpiece, as shown in figure 1, the magnetic gauge stand is adsorbed on the machine tool workbench. The eddy current sensor 10, the eddy current displacement sensor 15 and the three-way force sensor 8 are respectively connected with an A/D acquisition card 13 and a computer 14 after passing through an eddy current sensor signal processor 11) and a force sensor signal processor 12.
2) Data acquisition: as shown in FIG. 1, the sampling frequency of the sensor signal A/D acquisition card 13 is set to be fsAnd the whole measuring device is ensured to work normally after debugging. After the experiment begins, the grinding wheel frame spindle 2 is started to rotate at the rotating speed N (r/min), the rotating speed of the workpiece is W (r/min), and the initial values of signals of the eddy current sensor 10 and the eddy current displacement sensor 1) are recorded
And
three direction signal initial value normal direction of force sensor 8
Tangential direction Ft 0And axial direction
Then setting the feeding speed of the machine tool to be P (mm/min) to carry out a cut-in type grinding experiment, and recording the signal value of the eddy current displacement sensor at any time t in the grinding process
And
three direction signal values of sum force sensor
Ft tAnd
3) and (3) data filtering processing: 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.
4) Through the analysis and processing of the experimental data, the workpiece rigidity K at any moment t in the grinding process can be calculatedwSize. First, each party of the workpiece can be calculatedThe amount of change in the direction of the deformation and the force sensor is shown by the following equation:
ΔFt t＝Ft t-Ft 0 (7)
the total deformation amount Δ δ and the grinding force Δ F of the workpiece at an arbitrary time t can be expressed by the following equations:
workpiece rigidity K at any time t in grinding processwAnd can be represented by the following formula (10):
from the above (10), the workpiece rigidity K at any time t in the grinding process can be calculatedwThe rigidity of the workpiece is tested and compared by adjusting the clamping force of the centre, the rigidity of the headstock of the machine tool and the rigidity of the tailstock of the machine tool, so that the rigidity meets the processing requirements. During the actual grinding process, the rigidity K of the workpiece can be usedwThe grinding process parameters are adjusted according to the size, so that the grinding efficiency and the grinding quality of the processed workpiece are improved.
Claims (4)
1. The utility model provides a work piece rigidity on-line measuring device in grinding is cut into to excircle which characterized in that: the device comprises a three-way force sensor, an eddy current displacement sensor signal processor, an A/D acquisition card and a computer, wherein the three-way force sensor is arranged in a tailstock center, the tailstock center is arranged in a tailstock of a machine tool, the two eddy current displacement sensors are respectively arranged at a position h away from a contact area of a grinding wheel and a workpiece by a magnetic gauge stand and are perpendicular to each other, and the eddy current displacement sensor and the three-way force sensor are respectively connected with the A/D acquisition card and the computer after passing through the eddy current sensor signal processor and the force sensor signal processor.
2. The device for online measurement of workpiece stiffness in cylindrical plunge grinding according to claim 1, characterized in that: one eddy current displacement sensor is parallel to the feeding direction of the grinding wheel, and the other eddy current displacement sensor is perpendicular to the worktable of the machine tool.
3. The device for online measurement of workpiece stiffness in cylindrical plunge grinding according to claim 1, characterized in that: the measurement accuracy of the eddy current displacement sensor is less than 0.1um and the protection grade is more than IP 65.
4. The device for online measurement of workpiece stiffness in cylindrical plunge grinding according to claim 1, characterized in that: the eddy current sensor signal processor and the force sensor signal processor adopt Chebyshev I-type digital filters to perform low-pass filtering processing on the acquired data.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121919062.4U CN215999763U (en) | 2021-08-16 | 2021-08-16 | Workpiece rigidity online measuring device in excircle plunge grinding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121919062.4U CN215999763U (en) | 2021-08-16 | 2021-08-16 | Workpiece rigidity online measuring device in excircle plunge grinding |
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| CN215999763U true CN215999763U (en) | 2022-03-11 |
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| CN202121919062.4U Active CN215999763U (en) | 2021-08-16 | 2021-08-16 | Workpiece rigidity online measuring device in excircle plunge grinding |
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2021
- 2021-08-16 CN CN202121919062.4U patent/CN215999763U/en active Active
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