CN104330183A - Method and device for measuring transient milling temperature of semi-artificial thermocoupler - Google Patents
Method and device for measuring transient milling temperature of semi-artificial thermocoupler Download PDFInfo
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- CN104330183A CN104330183A CN201410648514.8A CN201410648514A CN104330183A CN 104330183 A CN104330183 A CN 104330183A CN 201410648514 A CN201410648514 A CN 201410648514A CN 104330183 A CN104330183 A CN 104330183A
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Abstract
The invention provides a method and a device for measuring transient milling temperature of a semi-artificial thermocouple. The method includes steps of a, implanting thermocouple wires into workpieces to be measured along the horizontal direction; b, arranging insulation parts between the workpieces to be measured and the thermocouple wires; c, connecting the workpieces to be measured and the thermocouple wires to a data acquiring device by leads; d, milling the workpieces to be measured along the direction parallel to the thermocouple wires; 3, acquiring and recording thermoelectric signals generated during milling. The thermocouple wires are horizontally arranged between the workpieces along the direction parallel to the milling and feeding direction, the thermoelectric signals can be continuously and stably generated during milling, and milling temperature signals can be more accurately and quickly obtained. The problem that the thermoelectric signals are uncontinuous and unstable due to the fact that the milling and feeding direction is perpendicular to the thermocouple wires by a general semi-artificial thermocouple method for measuring temperature is solved, and under lab and work site condition, the transient milling temperature can be quickly and accurately measured at low cost.
Description
Technical field
The present invention relates to the method and apparatus that Semi-artifical thermocouple transient state Milling Temperature is measured, for the on-line measurement of the Milling Temperature in metal cutting research.
Background technology
Milling Temperature is an Important Problems of technical study, and the real time dynamic measurement of measured point temperature is its gordian technique.What the method being used for measuring Milling Temperature at present in experimentation was commonly used mainly contains: optical heat radiation method, structure method, thermocouple method etc.
The principle adopting optical heat radiation method to measure Milling Temperature is: cutter, chip and the workpiece material Shi Douhui that is heated produces light, the heat radiation of some strength, and radiation intensity raises with temperature and strengthens.But the method is only limited to the temperature measuring cutter or outer surface of workpiece, cannot measure Tool in Cutting sword and rear knife face temperature.Corresponding structure at high temperature can be there is and change this principle and carry out thermometric in structure method based on metal material.The method judges the change of cutting temperature by the change observing metallographic structure before and after cutter or workpiece cutting, mainly be applicable to high-speed steel tool, because when temperature is more than 600 DEG C, the red hardness of high-speed steel declines, there is a series of change in institutional framework, checks that its metallographic structure changes by the microsection after polishing, corrosion.But the range of application of this method is confined to the cutter that metal material is made, and only has and at high temperature just can observe the obvious changes in microstructure of material; In addition, the workload of observation and analysis is also larger.Thermocouple method can be subdivided into following several: (1) natural thermocouple method.This method is reliably easy, machining condition (as cutting speed, the amount of feeding etc.) can be studied easily on the impact of cutting temperature, but the method can only measure the medial temperature of cutting zone, the temperature of cutting region specified point cannot be recorded, simultaneously, when after cutter material or workpiece material conversion, the pyroelecthc properties curve of thermopair also must be demarcated again; (2) artifical Thermocouple method.Artifical Thermocouple method can be used for the temperature measuring specified point on cutter, chip and workpiece, and can record the position of Temperature Distribution field and maximum temperature point.Its major advantage is: only need demarcate once for specific artifical Thermocouple material, thermocouple material can be selected flexibly.But more difficult owing to artifical Thermocouple being imbedded in ultrahard cutting tool material (as pottery, PCBN (polycrystalline cubic boron nitride), PCD (polycrystalline diamond) etc.), because which limit applying of the method.(3) Semi-artifical thermocouple method.This method is combined into by natural thermocouple method and artifical Thermocouple method.But when the Semi-artifical thermocouple method that milling uses usually measures transient state Milling Temperature, direction of feed is vertical with thermocouple wire, and pyroelectric signal can not be continual and steady, and the precision causing Milling Temperature to be measured greatly declines.Therefore, in the urgent need to solution problems of taking measures on customs clearance, to improve the measuring accuracy of Milling Temperature.
Summary of the invention
The object of the invention is to the method and apparatus proposing the measurement of a kind of Semi-artifical thermocouple transient state Milling Temperature, measuring cutting temperature by implanting thermocouple wire within the workpiece, directly can making in laboratory and working site environment for realizing quick, low cost, accurately transient state Milling Temperature measurement.
According to an aspect of the present invention, a kind of method providing Semi-artifical thermocouple transient state Milling Temperature to measure, comprising:
A, in measured workpiece, implant thermocouple wire in the horizontal direction;
B, between measured workpiece and described thermocouple wire, arrange insulating element;
Described measured workpiece and described thermocouple wire are connected to data acquisition equipment by c, use lead-in wire respectively;
D, along being parallel to the direction milling measured workpiece of described thermocouple wire;
E, the pyroelectric signal produced in milling process to be gathered and record.
According to a kind of embodiment, described measured workpiece is two workpiece by clamp, arranges insulating element between described fixture and described measured workpiece.
According to another aspect of the present invention, provide the device that a kind of Semi-artifical thermocouple transient state Milling Temperature is measured, it comprises: thermocouple wire, and it is located between two measured workpieces by clamp in the horizontal direction; Insulating element, it is arranged between described thermocouple wire and described measured workpiece, and between described measured workpiece and described fixture; Data acquisition equipment, it is connected to described measured workpiece and described thermocouple wire via lead-in wire, for the pyroelectric signal gathered when milling tool edge is parallel to the direction milling measured workpiece of described thermocouple wire and record produces.
Preferably, the material of described thermocouple wire is the tinsel different with the material of described measured workpiece, such as, comprises constantan wire, nickel filament.
Preferably, described insulating element comprises mica sheet.
Preferably, the length of described insulating element and width equal length and the width of described measured workpiece, and thickness is 0.01mm ~ 0.02mm.
Preferably, the length of described thermocouple wire equals the length of described measured workpiece, and diameter is 0.08 ~ 0.1mm.
The present invention by installing mica sheet, thermocouple wire, mica sheet successively between two measured workpieces, with fixture, workpiece, thermocouple wire, mica sheet are compressed again, connect workpiece and thermocouple wire respectively with two lead-in wires, form the device that Semi-artifical thermocouple transient state Milling Temperature is measured.Because milling feed direction is parallel with thermocouple wire direction, when cutting edge is through thermocouple wire, the mica sheet between thermocouple wire and workpiece is destroyed, and forms a transient heat contact, forms the hot junction of thermopair.Other one end of thermocouple wire and workpiece is due to comparatively far away apart from milling region, and temperature changes hardly, forms the cold junction of thermopair.So just constitute a thermopair by workpiece and thermocouple wire, and can continual and steady pyroelectric signal be formed.After workpiece material and thermocouple wire are demarcated, just can by the thermoelectrical potential between cold junction and hot junction and then the Milling Temperature measured at that time.
The invention has the beneficial effects as follows: during high-speed milling, cutter be in High Rotation Speed state and the cutting time of cutter very short, when adopting the Semi-artifical thermocouple measurement mechanism of thermocouple wire to measure Milling Temperature, thinner thermocouple wire can form less hot junction when cutting, improve the response speed of thermometric, directly can obtain the temperature of machined surface and the temperature of cutting edge, and parallel thermocouple wire direction, milling feed direction, continual and steady pyroelectric signal can be formed, more accurately and fast can obtain Milling Temperature signal.
Accompanying drawing explanation
Preferred implementation by describing in detail below in conjunction with accompanying drawing is understood by further feature of the present invention and advantage better, wherein:
Fig. 1 is the schematic diagram of the device according to Semi-artifical thermocouple transient state Milling Temperature measurement of the present invention;
Fig. 2 is thermocouple wire clamping schematic diagram in the device according to Semi-artifical thermocouple transient state Milling Temperature measurement of the present invention.
Embodiment
In the detailed description of following embodiment, 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.
Below in conjunction with Fig. 1 and Fig. 2, technical scheme of the present invention is described further.
According to technological parameter and process requirements, measured workpiece 4 and workpiece 12 are processed, and workpiece 4 and workpiece 12 are used for wired binding face polishing, with improve two workpiece in conjunction with precision.The tinsel (as constantan wire, nickel filament etc.) different with workpiece material is made length and workpiece is identical, thickness is the thermocouple wire 3 of 0.08 ~ 0.1mm.First mica sheet 10, thermocouple wire 3, second mica sheet 11 are installed successively between the first workpiece 4 and second workpiece 12, mica sheet thickness is 0.01 ~ 0.02mm, length and width are processed into the length and width that equal the first workpiece 4 and second workpiece 12 faying face, with fixture 2, first workpiece 4, first mica sheet 10, thermocouple wire 3, second mica sheet 11, second workpiece 12 are compressed again, be connected workpiece and thermocouple wire with the first lead-in wire 6 respectively with the second lead-in wire 9, form thermocouple assembly.Thermocouple assembly and fixture are arranged on milling machine table 1, the first lead-in wire 6 and the second lead-in wire 9 connection data collecting devices, such as data collecting card 7, and are connected with computing machine 8 by data collecting card 7.
During milling, when milling cutter 5 cuts through thermocouple assembly, workpiece and thermocouple wire overlap mutually, form thermal cross, loop conducting, due to workpiece and thermocouple wire material properties different, milling temperature rise can produce pyroelectric signal, pyroelectric signal is by lead-in wire 6 and 9, and soldier inputs computing machine 8 and records and display in real time after data collecting card 7.By this way, according to the demarcation of workpiece material and thermocouple wire, transient state Milling Temperature when can obtain milling.
Technology contents of the present invention and technical characterstic have disclosed as above, should be understood that, above-mentioned embodiment exists many alter modes, and these modes are clearly concerning various equivalent modifications.These amendment/modification fall into association area of the present invention, also should be included in the scope of appended claim.
Claims (11)
1. a method for Semi-artifical thermocouple transient state Milling Temperature measurement, is characterized in that, comprising:
A, in measured workpiece, implant thermocouple wire in the horizontal direction;
B, between measured workpiece and described thermocouple wire, arrange insulating element;
Described measured workpiece and described thermocouple wire are connected to data acquisition equipment by c, use lead-in wire respectively;
D, along being parallel to the direction milling measured workpiece of described thermocouple wire;
E, the pyroelectric signal produced in milling process to be gathered and record.
2. method according to claim 1, is characterized in that, the material of described thermocouple wire is the tinsel different with the material of described measured workpiece.
3. method according to claim 2, is characterized in that, described measured workpiece is two workpiece by clamp, arranges insulating element between described fixture and described measured workpiece.
4. the method according to aforementioned arbitrary claim, is characterized in that, the length of described insulating element and width equal length and the width of described measured workpiece.
5. the method according to aforementioned arbitrary claim, is characterized in that, the length of described thermocouple wire equals the length of described measured workpiece.
6. a device for Semi-artifical thermocouple transient state Milling Temperature measurement, is characterized in that, comprising:
Thermocouple wire, it is located between two measured workpieces by clamp in the horizontal direction;
Insulating element, it is arranged between described thermocouple wire and described measured workpiece, and between described measured workpiece and described fixture;
Data acquisition equipment, it is connected to described measured workpiece and described thermocouple wire via lead-in wire, for the pyroelectric signal gathered when milling tool edge is parallel to the direction milling measured workpiece of described thermocouple wire and record produces.
7. device according to claim 6, is characterized in that, the material of described thermocouple wire is the tinsel different with the material of described measured workpiece.
8. device according to claim 7, is characterized in that, described thermocouple wire comprises constantan wire, nickel filament.
9. device according to claim 6, is characterized in that, described insulating element comprises mica sheet.
10. device according to claim 6, is characterized in that, the length of described insulating element and width equal length and the width of described measured workpiece, and thickness is 0.01mm ~ 0.02mm.
11. devices according to claim 6, is characterized in that, the length of described thermocouple wire equals the length of described measured workpiece, and diameter is 0.08 ~ 0.1mm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104889820A (en) * | 2015-06-12 | 2015-09-09 | 济南大学 | Novel method for measuring drilling and cutting temperature |
| CN104924154A (en) * | 2015-06-10 | 2015-09-23 | 华中科技大学 | Method for measuring temperature values at different depths below surface of workpiece machined by machine tool |
| CN106271880A (en) * | 2016-09-20 | 2017-01-04 | 天津大学 | A kind of measurement milling process milling cutter and the measurement system of workpiece temperature simultaneously |
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| CN202066612U (en) * | 2011-05-26 | 2011-12-07 | 长沙理工大学 | Grindable semi-artifical thermocouple measurement device for grinding surface temperature |
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2014
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| SU773453A1 (en) * | 1978-05-15 | 1980-10-23 | Украинский Государственный Проектно- Технологический И Экспериментальный Институт "Укроргстанкинпром" | Method of measuring surface temperature at grinding |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104924154A (en) * | 2015-06-10 | 2015-09-23 | 华中科技大学 | Method for measuring temperature values at different depths below surface of workpiece machined by machine tool |
| CN104889820A (en) * | 2015-06-12 | 2015-09-09 | 济南大学 | Novel method for measuring drilling and cutting temperature |
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| CN106271880A (en) * | 2016-09-20 | 2017-01-04 | 天津大学 | A kind of measurement milling process milling cutter and the measurement system of workpiece temperature simultaneously |
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