Dynamometer structure with piezoelectric sensors distributed laterally
A piezoelectric sensor and force measurement technology, which is applied in the field of sensor measurement and control, can solve the problems of fast change of cutting force and poor dynamic characteristics of strain-type dynamometer, and achieves increase of natural frequency, increase of main direction sensitivity, The effect of increasing the compactness of the structure
Inactive Publication Date: 2019-08-30
DALIAN UNIV OF TECH
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Problems solved by technology
The strain gauge dynamometer has high sensitivity, high precision, and good static characteristics, but the cutting force changes rapidly, and the dynamic characteristics of the strain gauge dynamometer are poor
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[0020] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.
[0021] First install the piezoelectric sensor 4 at the corresponding position inside the support frame 2, use the pre-tightening screw 5 to pass through the support frame 2, and then pass the piezoelectric sensor 4 to fix it on the side of the base 1 with the workbench, the piezoelectric sensor 4 The output terminals are placed opposite to each other. The signal output terminal 3 is screwed into the wire output threaded hole 7, and its output line is connected to the data charge amplifier through the wire output threaded hole 7 of the support frame 2 and the signal output terminal 3.
[0022] Since the piezoelectric sensor 4 requires that the direction of the maximum sensitivity of the chip be parallel to the direction of the unidirectional force, if the piezoelectric sensor 4 deviates during installation, ...
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The invention belongs to the field of sensing measurement and control, and provides a dynamometer structure with piezoelectric sensors distributed laterally, applicable to dynamic three-axis force measurement during a milling, drilling or cutting process. The dynamometer structure comprises a substrate with workbenches on lateral sides, a support frame, a signal output plug, a piezoelectric sensor, a pre-tightening bolt, a sealing cover, a wire output threaded hole, a support frame fixing threaded hole and a sealing gasket. A concave cavity for accommodating a sensor is machined on the inner side of the support frame frame; when in installation, the sensor is sealed in the concave cavity, so that the structure is compact, and the environmental interferences of humidity and dust are reduced. When the substrate with the workbenches is installed, the bottom of the substrate is suspended, the top of the substrate with the workbenches is higher than the support frame, and thus the application range of the dynamometer is increased. The structure adopts the four piezoelectric sensors, each two piezoelectric sensors are distributed on one lateral surface of the substrate with the workbenches and symmetrical with the other two, the sensors separately adopt a pre-tightening mode of independently pre-tightening by using the respective pre-tightening bolt, the dynamometer structure measures the main principle axis force via the shearing effect of the sensors, and the principle axis sensitivity of the dynamometer is increased.
Description
technical field [0001] The invention belongs to the technical field of sensor measurement and control, and relates to a cutting force testing structure based on a piezoelectric mechanism in cutting processing. The structure is suitable for accurate measurement of dynamic multi-directional cutting force in drilling and milling. Background technique [0002] Cutting force is an important physical quantity in the cutting process. The study of cutting force is of great significance for further clarifying the cutting mechanism, calculating power consumption, designing cutting tools, machine tool fixtures, selecting cutting parameters, and optimizing tool geometric parameters. With the development of modern cutting processing towards high-speed powerful cutting and precision ultra-precision machining, higher requirements are put forward for the monitoring of cutting force. In particular, the cutting force of difficult-to-machine materials is large and the vibration frequency is fa...
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IPC IPC(8): G01L1/16
CPCG01L1/16
Inventor 张军李新阳贾振元任宗金
Owner DALIAN UNIV OF TECH