CN104764527A - Thermal error measuring device for workpiece machining - Google Patents
Thermal error measuring device for workpiece machining Download PDFInfo
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- CN104764527A CN104764527A CN201510145703.8A CN201510145703A CN104764527A CN 104764527 A CN104764527 A CN 104764527A CN 201510145703 A CN201510145703 A CN 201510145703A CN 104764527 A CN104764527 A CN 104764527A
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Abstract
The invention discloses a thermal error measuring device for workpiece machining. The thermal error measuring device for the workpiece machining comprises a workpiece surface temperature field real-time measuring module, a data collecting and processing module and a thermal error calculating module. Output of the workpiece surface temperature field real-time measuring module is accessed into the thermal error calculating module through the data collecting and processing module; real-time measuring is carried out on workpiece surface temperature by the workpiece temperature field real-time measuring module during the machining process, real-time collecting is carried out on measured temperature data by the data collecting and processing module, after the processing is carried out, the temperature data are input to the thermal error calculating module, a thermal error prediction model which is pre-implanted in the thermal error calculating module is combined, and a thermal error value during the workpiece machining process is calculated in the thermal error calculating module. According to the thermal error measuring device for the workpiece machining, thermal error online measuring for the workpiece machining can be achieved, the device can be used for aspects such as workpiece surface error monitoring and real-time error compensation.
Description
Technical field
The present invention relates to a kind of workpiece cut Thermal Error measurement mechanism.
Background technology
Can produce a large amount of heat in metal cuttings in process of metal working, wherein a part of heat in metal cutting imports workpiece into, makes workpiece produce thermal expansion deformation.In Precision Machining field, the Thermal Distortion on Machining Precision impact of workpiece is very large, and thus this workpiece thermal deformation caused by heat in metal cutting under many circumstances cannot be out in the cold.Usual employing measurement method or be that the numerical computation method of representative is to obtain work pieces process Thermal Error with finite element analysis.Measurement method obtains Thermal Error value the most directly method, but in the actual mismachining tolerance of workpiece except the thermal deformation errors caused by heat in metal cutting, also comprise the error etc. of error and the lathe caused by cutting force itself, measurement method is difficult to thermal deformation errors single area to separate.Finite element method is numerical computation method the most frequently used at present, effectively can instruct processing, but because analytical model has done a large amount of simplification on the basis of reality processing operating mode, its accuracy and precision are difficult to ensure, finite element analysis is difficult to accomplish real-time in addition.
Summary of the invention
The present invention solves the technical matters existed in above-mentioned prior art, and the advantage of comprehensive measurement method and finite element method, provides a kind of workpiece cut Thermal Error measurement mechanism.Use temperature measurer to measure in real time workpiece temperature field in process, in conjunction with Thermal Error computation model, calculate Thermal Error value in workpiece process.
For achieving the above object, design of the present invention is as follows:
A kind of workpiece cut Thermal Error measurement mechanism, for measuring the workpiece thermal deformation errors caused by heat in metal cutting in process.Described workpiece cut Thermal Error measurement mechanism comprises workpiece surface temperature field real-time measurement module, data acquisition and procession module, Thermal Error forecast model and Thermal Error computing module.Described workpiece surface temperature field real-time measurement module is measured in real time to workpiece surface temperature in working angles.Described data acquisition and procession module carries out Real-time Collection to the temperature data measured, and inputs described Thermal Error computing module after suitably processing.In described Thermal Error computing module, in conjunction with described Thermal Error forecast model, calculate Thermal Error value in workpiece process.
According to foregoing invention design, the present invention adopts following technical proposals:
A kind of workpiece cut Thermal Error measurement mechanism, comprise workpiece surface temperature field real-time measurement module, data acquisition and procession module and Thermal Error computing module, is characterized in that: the output of described workpiece surface temperature field real-time measurement module is through data acquisition and procession module access Thermal Error computing module; Described workpiece temperature field real-time measurement module is measured in real time to workpiece surface temperature in working angles, described data acquisition and procession module carries out Real-time Collection to the temperature data measured, and input described Thermal Error computing module after treatment, in described Thermal Error computing module, in conjunction with the Thermal Error forecast model implanted in advance wherein, calculate Thermal Error value in workpiece process.
Described workpiece surface temperature field real-time measurement module comprises infrared thermometer, scanning topworks, motion-control module.Described infrared thermometer is installed in described scanning topworks, and described scanning topworks can be straight line slide unit or tilting mechanism.Described motion-control module drives the motion of described scanning topworks, and then drives described infrared thermometer to carry out scanning survey temperature data to surface of the work.Scan the kinetic characteristic of topworks described in described moving control module for controlling, thus realize carrying out described temperature measurer measuring position and sweep velocity etc. accurately controlling.
Described workpiece surface temperature field real-time measurement module can realize two kinds of temperature survey modes: 1) for comparatively machining long workpieces, straight line slide unit can be utilized to realize fast reciprocating rectilinear scanning and measure; 2) for comparatively casual labourer's part or measure curved surface, tilting mechanism can be utilized to realize fast reciprocating oscillatory scanning and to measure.
The present invention compared with prior art, has following apparent outstanding substantive distinguishing features and conspicuousness technical progress:
In technical solution of the present invention, because in working angles, the change of workpiece temperature field directly results in workpiece thermal deformation, workpiece surface temperature field measured and temperature data is substituted into the method for Thermal Error computation model, can effectively Thermal Error and other forms of error be made a distinction.Meanwhile, temperature measurer, to the scanning survey of temperature data and collection, has very strong real-time.A kind of workpiece temperature field measurement method proposed, can carry out the measurement in temperature field, have good versatility for dissimilar part.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of Thermal Error measurement mechanism system of the present invention.
Fig. 2 is workpiece surface temperature field real-time measurement module diagram.
Fig. 3 and Fig. 4 is straight line slide unit and tilting mechanism two kinds of form structure schematic diagram of scanning topworks respectively.
Fig. 5 is temperature measurer scanning motion schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are elaborated: following embodiment is implemented under premised on technical solution of the present invention; give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment one:
See Fig. 1 ~ Fig. 4, this workpiece cut Thermal Error measurement mechanism, comprise workpiece surface temperature field real-time measurement module (1), data acquisition and procession module (2) and Thermal Error computing module (4), is characterized in that: the output of described workpiece surface temperature field real-time measurement module (1) is through data acquisition and procession module (2) access Thermal Error computing module (4); Described workpiece temperature field real-time measurement module (1) is measured in real time to workpiece surface temperature in working angles, described data acquisition and procession module (2) carries out Real-time Collection to the temperature data measured, and input described Thermal Error computing module (4) after treatment, in described Thermal Error computing module (4), in conjunction with the Thermal Error forecast model implanted in advance wherein, calculate Thermal Error value in workpiece process.
Embodiment two:
The present embodiment is substantially identical with embodiment one, and special feature is as follows:
As shown in Figure 2, described workpiece temperature field real-time measurement module (1) comprises infrared thermometer 5, scanning topworks 6 and motion-control module 7, described infrared thermometer 5 is installed in described scanning topworks 6, and described scanning topworks 6 is straight line slide unit or tilting mechanism.Described motion-control module 7 drives described scanning topworks 6 to move, and then drives described infrared thermometer 5 pairs of workpiece 9 surfaces to carry out scanning survey temperature data; Described motion-control module 7 controls the kinetic characteristic of described scanning topworks 6, thus realizes carrying out described infrared thermometer 5 measuring position and sweep velocity accurately controlling.
Described workpiece surface temperature field real-time measurement module (1) can realize two kinds of temperature survey modes: 1) for comparatively machining long workpieces, straight line slide unit can be utilized to realize fast reciprocating rectilinear scanning and measure; 2) for comparatively casual labourer's part or measure curved surface, tilting mechanism can be utilized to realize fast reciprocating oscillatory scanning and to measure.
Embodiment three:
As shown in Figure 1, this workpiece cut thermal error compensating device by workpiece surface temperature field real-time measurement module (1), data acquisition and procession module (2), Thermal Error forecast model (3), Thermal Error computing module (4).Described workpiece surface temperature field real-time measurement module (1) is measured in real time to workpiece surface temperature in working angles.Described data acquisition and procession module (2) carries out Real-time Collection to the temperature data measured, and inputs described Thermal Error computing module (4) after suitably processing.In described Thermal Error computing module, the temperature data that data acquisition and procession module (2) inputs is substituted into described Thermal Error forecast model (3), calculates Thermal Error value in workpiece process in real time.
As shown in Figure 2, workpiece temperature field real-time measurement module diagram, scans topworks here for straight line slide unit, but scans topworks in the present invention and be not limited to straight line slide unit.In actual cut process, cutter 8 makes axial feed motion along workpiece 9.Infrared thermometer 5 is installed on the slide block 6 ' of slide unit 6, and slide block 6 ' is installed on slide unit guide rail 6 " above also can be reciprocating along guide rail, thus drive infrared thermometer 5 pairs of workpiece to carry out surface sweeping thermometric.Slide unit 6 is driven by motion-control module 7 and controls, and can realize the various characteristics of motion set.
As Fig. 3 and Fig. 4 illustrate respectively as described in scanning topworks have straight line slide unit 6(a) with tilting mechanism 6(b) two kinds of forms, thus two kinds of temperature survey modes can be realized: 1) for comparatively machining long workpieces, straight line slide unit can be utilized to realize fast reciprocating rectilinear scanning and measure; 2) for comparatively casual labourer's part or measure curved surface, tilting mechanism can be utilized to realize fast reciprocating oscillatory scanning and to measure.
Described slide unit can be nc sliding table, or other form slide units.
Described infrared thermometer 5 can adopt infrared point temperature instrument, also can adopt thermal infrared imager.According to sweep length, temperature measurer temperature data sample frequency, and tool feeding speed determines the scanning motion characteristic of infrared thermometer.Be illustrated in figure 5 the reciprocating formula scanning of interval, its transverse axis is workpiece thermometric length, and the longitudinal axis is time shaft, t
nrepresented for the n-th scan period, in the scan period, comprise sweep time and stand-by time.Enough in short-term when sweep time, can be similar to and think that scanning result is a certain moment workpiece temperature field.
Described data acquisition and procession module (2) carries out Acquire and process to temperature data, according to the surface of the work point for measuring temperature quantity chosen and position, and Thermal Error forecast model version, generate following temperature vector:
Wherein,
when representing infrared thermometer i-th scanning survey workpiece temperature field, the n-th point for measuring temperature temperature value.
Described Thermal Error forecast model (3), can be obtained by test or cae analysis, its expressing character is as follows:
Described Thermal Error computing module (4) is made up of a set of calculation procedure, can read observed temperature data array, when calculating the Thermal Error of i-th cutting point, is multiplied by the i-th row in described Thermal Error forecast model matrix by the temperature data vector of i-th scanning temperature measuring:
Wherein,
represent the heat distortion amount of i-th cutting point.
Claims (3)
1. a workpiece cut Thermal Error measurement mechanism, comprise workpiece surface temperature field real-time measurement module (1), data acquisition and procession module (2) and Thermal Error computing module (4), is characterized in that: the output of described workpiece surface temperature field real-time measurement module (1) is through data acquisition and procession module (2) access Thermal Error computing module (4); Described workpiece temperature field real-time measurement module (1) is measured in real time to workpiece surface temperature in working angles, described data acquisition and procession module (2) carries out Real-time Collection to the temperature data measured, and input described Thermal Error computing module (4) after treatment, in described Thermal Error computing module (4), in conjunction with the Thermal Error forecast model (3) implanted in advance wherein, calculate Thermal Error value in workpiece process.
2. workpiece cut Thermal Error measurement mechanism according to claim 1, it is characterized in that, described workpiece temperature field real-time measurement module (1) comprises infrared thermometer (5), scanning topworks (6) and motion-control module (7), described infrared thermometer (5) is installed on described scanning topworks (6), described scanning topworks (6) is straight line slide unit or tilting mechanism, described motion-control module (7) drives described scanning topworks (6) to move, and then drive described infrared thermometer (5) to carry out scanning survey temperature data to workpiece (9) surface, described motion-control module (7) controls the kinetic characteristic of described scanning topworks (6), thus realizes carrying out described infrared thermometer (5) measuring position and sweep velocity accurately controlling.
3. workpiece cut Thermal Error measurement mechanism according to claim 2, it is characterized in that, described workpiece surface temperature field real-time measurement module (1) can realize two kinds of temperature survey modes: 1) for comparatively machining long workpieces, straight line slide unit can be utilized to realize fast reciprocating rectilinear scanning and measure; 2) for comparatively casual labourer's part or measure curved surface, tilting mechanism can be utilized to realize fast reciprocating oscillatory scanning and to measure.
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| CN105798695A (en) * | 2016-04-18 | 2016-07-27 | 安徽省捷甬达智能机器有限公司 | Temperature rise compensation method for machine tool |
| CN106404177A (en) * | 2016-08-23 | 2017-02-15 | 合肥金星机电科技发展有限公司 | Infrared scanning measured temperature correcting method |
| CN107907216A (en) * | 2017-11-09 | 2018-04-13 | 中国航发湖南动力机械研究所 | Brush seal dynamic temperature field measurement device |
| CN108803486A (en) * | 2018-08-16 | 2018-11-13 | 重庆理工大学 | Numerical control machining tool heat error prediction based on deep learning network in parallel and compensation method |
| TWI652560B (en) | 2017-09-15 | 2019-03-01 | 葉美蓉 | Automatic compensation system and method for thermal deformation of cnc machine tool |
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| TWI652560B (en) | 2017-09-15 | 2019-03-01 | 葉美蓉 | Automatic compensation system and method for thermal deformation of cnc machine tool |
| CN107907216A (en) * | 2017-11-09 | 2018-04-13 | 中国航发湖南动力机械研究所 | Brush seal dynamic temperature field measurement device |
| CN107907216B (en) * | 2017-11-09 | 2019-06-07 | 中国航发湖南动力机械研究所 | Brush seal dynamic temperature field measurement device |
| CN108803486A (en) * | 2018-08-16 | 2018-11-13 | 重庆理工大学 | Numerical control machining tool heat error prediction based on deep learning network in parallel and compensation method |
| CN108803486B (en) * | 2018-08-16 | 2021-02-02 | 重庆理工大学 | Numerical control machine tool thermal error prediction and compensation method based on parallel deep learning network |
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