CN115464530A - Online monitoring device and monitoring method for wire bow in mechanical cutting of flexible abrasive particles - Google Patents
Online monitoring device and monitoring method for wire bow in mechanical cutting of flexible abrasive particles Download PDFInfo
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- CN115464530A CN115464530A CN202211173528.XA CN202211173528A CN115464530A CN 115464530 A CN115464530 A CN 115464530A CN 202211173528 A CN202211173528 A CN 202211173528A CN 115464530 A CN115464530 A CN 115464530A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
- B24B27/0633—Grinders for cutting-off using a cutting wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/06—Grinders for cutting-off
- B24B27/0683—Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/10—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
- B24B49/105—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means using eddy currents
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- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The scheme of the invention provides an online monitoring device and an online monitoring method for wire bow in mechanical cutting of flexible abrasive particles, which can accurately monitor the angle of the wire bow online in real time according to the electromagnetic induction principle of an eddy current sensor, are suitable for cutting and processing of all flexible abrasive particle wire saws with metal as cutting tool substrates, meet the requirements of various industries on processing materials, and greatly reduce the processing cost brought by the forms of manual observation, photographing and the like. Compared with a distance sensor monitoring mode, the stability in the online monitoring process is improved, and the full-data monitoring of the angle of the wire arch in the cutting process is guaranteed.
Description
Technical Field
The invention relates to the field of flexible abrasive particle machining, in particular to a device and a method for monitoring a wire bow in flexible abrasive particle mechanical cutting on line.
Background
The flexible abrasive particle mechanical cutting technology has the advantages of high processing efficiency, small incision loss, no restriction of the size of workpiece materials and the like, and is widely applied to cutting of brittle and hard materials such as sapphire, silicon carbide, stone and the like. During the cutting process, contact force exists between the workpiece and the flexible abrasive grain tool, so that the cutting tool can be bent to a certain degree to form a wire bow phenomenon.
The phenomenon of wire bow in the cutting process can reappear on the surface of a workpiece, so that saw marks with the same shape as the wire bow appear on the surface of the workpiece, and the surface quality of the workpiece is influenced. When the wire bow angle is too large, it can result in breakage of the cutting tool, resulting in loss of material. In addition, since the contact position of the workpiece and the flexible abrasive tool cannot reach the set coordinate point, the shape accuracy of the workpiece varies.
Li Zhen et al, in the invention patent "an apparatus and method for monitoring wire bow of wire net of multi-wire cutting machine on line" (publication No. CN 106313353A), it is proposed to measure the wire saw offset distance by using distance sensors such as ultrasonic distance sensor and laser distance sensor, and calculate the wire bow angle by trigonometric function relationship. However, for a cutting tool with a small diameter, when the cutting process vibrates, the laser distance sensor cannot accurately project on the cutting tool, so that the monitoring is difficult.
Qu Dong L et al in the invention patent "method and apparatus for detecting wire bow in photovoltaic silicon wafer cutting process" (publication No. CN 107672071) proposes that the wire bow angle is obtained by geometric angle calculation by observing the longitudinal height of a wire saw through a telescopic lens with a transparent scale, and the center of the lens is provided with a cross mark. The observation method cannot obtain real-time wire bow data on line, and the labor cost is high.
In the invention patent of 'control method and control system for cutting crystal bar by diamond wire' (publication number CN 111923261A), a wire bow angle is obtained by surveying and mapping in a visual photographing or projection imaging mode and automatic calculation, and whether the wire bow height is higher than a threshold value is judged by calculating the wire bow height, and if so, the wire bow is retreated for a certain distance. The visual shooting mode can not obtain real-time line bow data on line, and the visual processing process is time-consuming.
In the invention patent "a wire bow parameter detection device for a multi-wire saw" (publication number CN113665009 a), it is proposed to measure the three-dimensional force applied to a material and the tension change of a diamond wire in a cutting process by using a three-dimensional force measuring part and a tension measuring part. However, compared with the numerical value of the bow angle of the wire which is directly monitored, the method for representing the wire bow through the three-dimensional force of the material is not intuitive and accurate.
From the above, when the brittle and hard materials are mechanically cut by the flexible abrasive particles, the line bow phenomenon affects the surface quality and the shape precision of the cut workpiece, and when the line bow angle is too large, the line is broken, so that the material loss is caused. The common line bow monitoring technology mainly comprises modes such as a laser distance sensor, visual photographing observation and mechanical characterization, and has the problems of difficult monitoring, high labor cost, incapability of obtaining real-time line bow angle data on line and the like.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art, and provides the online monitoring device and the monitoring method for the wire bow mechanically cut by the flexible abrasive particles, so that the processing cost caused by manual observation, photographing and other forms is greatly reduced, the stability in the online monitoring process is improved, and the full-data monitoring of the wire bow angle in the cutting process is ensured.
The invention adopts the following technical scheme:
an on-line monitoring device of a wire bow for mechanical cutting of flexible abrasive particles, the on-line monitoring device comprising: the device comprises a fixed supporting seat, an eddy current sensor, an extension cable, an oscillator, a charge amplifier, a power supply and a wire bow data acquisition system; the eddy current sensor is fixed on the machine tool body through the fixed support seat, and the probe head of the eddy current sensor is close to the cutting tool and is parallel to the feeding direction; the oscillator emits high-frequency oscillation current which flows into the eddy current sensor probe through the extension cable, and an alternating magnetic field is generated in a coil at the head of the probe; the eddy current sensor is connected with the charge amplifier to amplify and output a monitored charge signal to the wire bow data acquisition system.
In particular, the flexible abrasive grain machine includes, but is not limited to, a fixed abrasive grain wire saw, a free abrasive grain wire saw, or a wire saw, in which the matrix is metal.
Specifically, the eddy current sensor is connected with a fixed support seat through a round nut to adjust the horizontal position of the eddy current sensor and the distance between the eddy current sensor and a measured metal tool; the fixed supporting seat is connected with the machine tool body through a bolt to adjust the vertical position of the eddy current sensor.
In the above device for monitoring a wire bow in online mechanical cutting with flexible abrasive particles, the method for monitoring a wire bow in online comprises:
step A: installing a workpiece; the cutting workpiece is adhered on the workbench by glue, and the horizontal distance L from the edge of the cutting workpiece to the guide wheel is reserved;
and B, step B: installing a wire bow online monitoring device; the eddy current sensor is arranged on a machine tool body through a fixed support seat by utilizing a screw and a nut, so that the cross section of a probe of the eddy current sensor is ensured to be parallel to the feeding direction, a metal tool to be measured is positioned in the center of the probe, and the distance between the metal probe and the metal tool to be measured is proper;
and C: calibrating and calculating output charges and a line bow angle; the calibration process of the output charge and the wire bow angle is carried out in a non-cutting machining state, the feeding movement of the workbench is controlled, and the relation between the output charge and the movement time is monitored; by the speed of movement V f Obtaining the relation between the feeding displacement and the moving time, and calculating the relation between the line bow angle theta and the moving time t according to the trigonometric function relation:
calculating the mathematical relation between the line bow angle and the output charge according to the mathematical relation between the output charge and the moving time and the mathematical relation between the line bow angle and the moving time;
step D: displaying a line bow angle in real time; and starting cutting, wherein an acting force exists between the cutting tool and the workpiece, so that the cutting tool is bent to form a line bow angle, the eddy current sensor monitors the change of the surface current of the cutting tool, the output charge is obtained through the charge amplifier, and the size of the real-time line bow angle is obtained on line through calculation of the embedded mathematical model.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
the scheme of the invention provides an online monitoring device and an online monitoring method for wire bow in mechanical cutting of flexible abrasive particles, which can accurately monitor the angle of the wire bow online in real time according to the electromagnetic induction principle of an eddy current sensor, are suitable for cutting and processing of all flexible abrasive particle wire saws with metal as cutting tool substrates, meet the requirements of various industries on processing materials, and greatly reduce the processing cost brought by the forms of manual observation, photographing and the like. Compared with a distance sensor monitoring mode, the stability in the online monitoring process is improved, and the full-data monitoring of the angle of the wire arch in the cutting process is guaranteed.
Drawings
FIG. 1 is a schematic view of a wire bow monitoring device installation;
FIG. 2 is a block diagram of a wire bow monitoring device;
FIG. 3 is a schematic view of a wire bow monitoring device;
FIG. 4 is a graphical illustration of the mathematical relationship of output charge to time;
FIG. 5 is a graphical illustration of the mathematical relationship of line bow angle and time;
FIG. 6 is a graphical illustration of the mathematical relationship between the wire bow angle and the output charge;
fig. 7 is a schematic view of on-line monitoring of the process line bow angle.
The invention is described in further detail below with reference to the figures and specific examples.
Detailed Description
The scheme of the invention provides an online monitoring device and an online monitoring method for wire bow in mechanical cutting of flexible abrasive particles, which can accurately monitor the angle of the wire bow online in real time according to the electromagnetic induction principle of an eddy current sensor, are suitable for cutting and processing of all flexible abrasive particle wire saws with metal as cutting tool substrates, meet the requirements of various industries on processing materials, and greatly reduce the processing cost brought by the forms of manual observation, photographing and the like. Compared with a distance sensor monitoring mode, the stability in the online monitoring process is improved, and the full-data monitoring of the angle of the wire arch in the cutting process is guaranteed.
As shown in fig. 1-2, the present embodiment provides an online monitoring device for a wire bow in mechanical cutting with flexible abrasive particles, which includes a fixed support, an eddy current sensor, an extension cable, an oscillator, a charge amplifier, a power supply, and a wire bow data acquisition system. The eddy current sensor is fixed on the machine tool body through the fixed supporting seat, and the probe head of the eddy current sensor is close to the cutting tool and is parallel to the feeding direction. The oscillator emits a high frequency oscillating current through the extension cable into the eddy current sensor probe, generating an alternating magnetic field in a coil at the probe head. The eddy current sensor is connected with the charge amplifier to amplify and output a monitored charge signal to the wire bow data acquisition system.
The flexible abrasive grain machine comprises a fixed abrasive grain wire saw, a free abrasive grain wire saw or a wire saw, wherein the base body of the fixed abrasive grain wire saw, the free abrasive grain wire saw or the wire saw is made of metal.
As shown in fig. 2, the eddy current sensor is connected with the support base through a round nut, so that the horizontal position of the eddy current sensor and the distance between the eddy current sensor and the metal tool to be measured can be adjusted. The supporting seat is connected with the machine tool body through a bolt, so that the vertical position of the eddy current sensor can be adjusted.
As shown in FIG. 3, the monitoring principle of the eddy current sensor is that when the chord length of the metal tool to be measured passing through the cross section of the probe of the eddy current sensor is changed, the induced current generated on the surface of the metal tool is changed, and simultaneously, the generated alternating magnetic field opposite to the head direction changes, and the charge signal output by the charge amplifier flows through the charge amplifier.
As shown in fig. 4-7, the present embodiment provides a method for monitoring a wire bow in an online manner, including the steps of
Step A: and (5) mounting the workpiece. The cutting workpiece is glued on the worktable by glue, and the horizontal distance L from the edge of the workpiece to the guide wheel is measured.
And B: and (5) installing a wire bow online monitoring device. The eddy current sensor is arranged on a machine tool body through a support seat by utilizing a screw and a nut, the cross section of a probe of the eddy current sensor is ensured to be parallel to the feeding direction, a measured metal tool is positioned in the center of the probe, and the distance between the metal probe and the measured metal tool is proper.
Step C: output charge andand (5) calibrating and calculating the wire bow. The calibration process of the output charge and the wire bow angle is carried out in a non-cutting machining state, the feeding movement of the workbench is controlled, and the moving speed is V f And monitoring the mathematical relation between the output charge and the moving time, taking the single-wire reciprocating cutting of the fixed abrasive particle diamond wire saw as an example, when the horizontal distance L of the workpiece is 285mm, the feeding speed V is f Fig. 4 shows a mathematical relationship between the monitored output charge and the moving time when the speed is 5 mm/min. By the speed of movement V f Obtaining the mathematical relationship between the feeding amount and the moving time, and calculating the mathematical relationship between the line bow angle and the moving time according to the trigonometric function relationship, as shown in FIG. 5, the line bow angle is
The mathematical relationship between the line bow angle and the output charge is fit and calculated according to the mathematical relationship between the output charge and the moving time and the mathematical relationship between the line bow angle and the moving time, as shown in fig. 6.
Step D: and displaying the line bow angle in real time. Cutting processing is started, acting force exists between the cutting tool and a workpiece, so that the cutting tool bends to form a linear bow angle, the eddy current sensor monitors the change of the surface current of the cutting tool, output charges are obtained through the charge amplifier, and the size of the linear bow angle in real time is obtained through calculation of the embedded mathematical model, as shown in fig. 7.
The scheme of the invention provides an online monitoring device and an online monitoring method for a wire bow for mechanical cutting of flexible abrasive particles, which can accurately monitor the angle of the wire bow online in real time according to the electromagnetic induction principle of an eddy current sensor, are suitable for cutting and processing of all flexible abrasive particle wire saws with metal cutting tool matrixes, meet the requirements of various industries on processing materials, and greatly reduce the processing cost brought by forms of manual observation, photographing and the like. Compared with a distance sensor monitoring mode, the stability in the online monitoring process is improved, and the full-data monitoring of the angle of the wire arch in the cutting process is guaranteed.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using this concept shall fall within the scope of the present invention.
Claims (4)
1. An on-line monitoring device of a wire bow for flexible abrasive grain mechanical cutting, the on-line monitoring device comprising: the device comprises a fixed supporting seat, an eddy current sensor, an extension cable, an oscillator, a charge amplifier, a power supply and a wire bow data acquisition system; the eddy current sensor is fixed on the machine tool body through the fixed support seat, and the probe head of the eddy current sensor is close to the cutting tool and is parallel to the feeding direction; the oscillator emits high-frequency oscillation current which flows into the eddy current sensor probe through the extension cable, and an alternating magnetic field is generated in a coil at the head of the probe; the eddy current sensor is connected with the charge amplifier to amplify and output a monitored charge signal to the wire bow data acquisition system.
2. A flexible abrasive mechanical cutting wire bow on-line monitoring device according to claim 1, wherein: the flexible abrasive grain machinery includes, but is not limited to, a fixed abrasive grain wire saw, a free abrasive grain wire saw or a wire saw with a metal matrix.
3. A flexible abrasive mechanical cutting wire bow on-line monitoring device according to claim 1, wherein: the eddy current sensor is connected with the fixed support seat through a round nut to adjust the horizontal position of the eddy current sensor and the distance between the eddy current sensor and a measured metal tool; the fixed supporting seat is connected with the machine tool body through a bolt to adjust the vertical position of the eddy current sensor.
4. A device for monitoring the presence of a wire bow in a mechanical cut with flexible abrasive particles according to any one of claims 1 to 3, wherein: the on-line monitoring method of the wire bow comprises the following steps:
step A: installing a workpiece; the cutting workpiece is adhered on the workbench by glue, and the horizontal distance L from the edge of the cutting workpiece to the guide wheel is reserved;
and B: installing a wire bow online monitoring device; the eddy current sensor is arranged on a machine tool body through a fixed support seat by utilizing a screw and a nut, so that the cross section of a probe of the eddy current sensor is ensured to be parallel to the feeding direction, a metal tool to be measured is positioned in the center of the probe, and the distance between the metal probe and the metal tool to be measured is proper;
and C: calibrating and calculating output charges and a line bow angle; the calibration process of the output charge and the wire bow angle is carried out in a non-cutting machining state, the feeding movement of the workbench is controlled, and the relation between the output charge and the movement time is monitored; by the speed of movement V f Obtaining the relation between the feeding displacement and the moving time, and calculating the relation between the wire bow angle theta and the moving time t according to the trigonometric function relation:
calculating the mathematical relation between the line bow angle and the output charge according to the mathematical relation between the output charge and the moving time and the mathematical relation between the line bow angle and the moving time;
step D: displaying a line bow angle in real time; and starting cutting, wherein an acting force exists between the cutting tool and the workpiece, so that the cutting tool bends to form a linear bow angle, the eddy current sensor monitors the change of the surface current of the cutting tool, the output charge is obtained through the charge amplifier, and the size of the real-time linear bow angle is obtained on line through calculation of the embedded mathematical model.
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| CN202211173528.XA CN115464530A (en) | 2022-09-26 | 2022-09-26 | Online monitoring device and monitoring method for wire bow in mechanical cutting of flexible abrasive particles |
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| CN202211173528.XA CN115464530A (en) | 2022-09-26 | 2022-09-26 | Online monitoring device and monitoring method for wire bow in mechanical cutting of flexible abrasive particles |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104108138A (en) * | 2014-07-09 | 2014-10-22 | 华侨大学 | Rope saw wire arch angle control method and device |
| CN203994260U (en) * | 2014-07-09 | 2014-12-10 | 华侨大学 | A kind of control device of the sawline bow angle of restricting |
| CN106313353A (en) * | 2015-07-03 | 2017-01-11 | 天津职业技术师范大学 | Online monitoring device and method for wire bow of wire mesh of multi-wire sawing machine |
| CN113665009A (en) * | 2021-08-30 | 2021-11-19 | 燕山大学 | Wire bow parameter monitoring device for multi-wire cutting machine |
-
2022
- 2022-09-26 CN CN202211173528.XA patent/CN115464530A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104108138A (en) * | 2014-07-09 | 2014-10-22 | 华侨大学 | Rope saw wire arch angle control method and device |
| CN203994260U (en) * | 2014-07-09 | 2014-12-10 | 华侨大学 | A kind of control device of the sawline bow angle of restricting |
| CN106313353A (en) * | 2015-07-03 | 2017-01-11 | 天津职业技术师范大学 | Online monitoring device and method for wire bow of wire mesh of multi-wire sawing machine |
| CN113665009A (en) * | 2021-08-30 | 2021-11-19 | 燕山大学 | Wire bow parameter monitoring device for multi-wire cutting machine |
Non-Patent Citations (1)
| Title |
|---|
| "李静李静欢迎你": ""电涡流传感器"", pages 2, Retrieved from the Internet <URL:https://baike.baidu.com/item/%E7%94%B5%E6%B6%A1%E6%B5%81%E4%BC%A0%E6%84%9F%E5%99%A8?fromModule=lemma_search-box> * |
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