CN105352631A - Method for measuring proportion of frictional heat in total cutting heat in machining process - Google Patents
Method for measuring proportion of frictional heat in total cutting heat in machining process Download PDFInfo
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- CN105352631A CN105352631A CN201510704385.4A CN201510704385A CN105352631A CN 105352631 A CN105352631 A CN 105352631A CN 201510704385 A CN201510704385 A CN 201510704385A CN 105352631 A CN105352631 A CN 105352631A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K17/00—Measuring quantity of heat
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Abstract
The invention aims to provides a method for measuring the proportion of frictional heat in total cutting heat in a machining process, solves the problem that sources of cutting heat are different to determine, and provides a basis for effectively lowering a cutting temperature. In the prior art, only the temperature generated in the cutting machining process can be obtained, and the sources of the temperature are hard to effectively distinguish. A frictional heat detection method is adopted, and the frictional heat and the cutting heat in the machining process are separated, so that the comparison of the two kinds of heat is realized. According to the invention, the cutting temperature and the frictional temperature generated by the friction between a cutter and a machined material in a routine hole preparing process are compared, the proportion of the frictional heat in the cutting heat can be accurately judged; in addition, the sources of the cutting heat are accurately measured, so that the rapid optimization of a cutter material and cutting parameters in the practical machining process is facilitated.
Description
Technical field
The present invention relates to material processing research field, be specifically related to the assay method that heat of friction in a kind of process accounts for overall heat in metal cutting ratio.
Background technology
In material processing, usually produce a large amount of heat in metal cuttings.The mensuration in heat in metal cutting source is most important for attenuating cutting temperature.Only on the basis of heat in metal cutting origin, the method effectively reducing cutting temperature could be proposed.In material processing, be one of important sources of heat in metal cutting by the elastic properties of materials heat of friction of being out of shape between caused cutter and machined material.
In plastic material process, the plastic yield of material is the important sources of heat in metal cutting.But, in the working angles of hard brittle material, because the plastic deformation ability of hard brittle material is less, namely in less plastic yield situation, just the phenomenons such as broken are produced, therefore the heat in metal cutting caused by plastic yield in hard brittle material working angles is usually less, and the heat of friction between cutter and machined material is the main source of heat in metal cutting.Particularly in drilling process, because cutting zone is semiclosed form, heat in metal cutting is difficult to effectively and the external world carries out heat interchange, and cause the temperature of cutting zone higher, the impact of heat of friction on cutting temperature is larger.Can how effectively to judge that in material removal process, heat of friction accounts for the ratio of overall heat in metal cutting, be the key factor that effectively reduce cutting temperature, is also the important foundation of the research such as cutting tool choice, process optimization.
Summary of the invention
In view of the defect that prior art exists, the invention provides the assay method that heat of friction in a kind of material removal process accounts for overall heat in metal cutting ratio, thus solution heat in metal cutting source is difficult to clear and definite problem, basis can be provided for effectively reducing cutting temperature, being also conducive to the research of cutting tool choice, process optimization.
For the technical solution adopted in the present invention that achieves the above object is the assay method that in a kind of material removal process, heat of friction accounts for overall heat in metal cutting ratio, it comprises the steps:
(1) cutter rotating speed and the amount of feeding are set, carry out drilling test, detect the temperature in drilling process, and record the cutting time;
(2) adopt identical cutter rotating speed and the amount of feeding to carry out the test of drilling again, when drilling is to the certain thickness of machined material, stop the motion of cutter;
(3) after the machined material in step (2) cools completely, arrange the rotating speed consistent with step (1), amount of feed is zero simultaneously, and cutter is rotated;
(4) when in step (3), the rotational time of cutter is consistent with the cutting time of recording in step (1), detected temperatures;
(5) ratio of the middle temperature variation of calculation procedure (1) and the middle temperature variation of step (4), obtains the ratio that heat of friction accounts for heat in metal cutting.
The detection of temperature described in step (1) adopts infrared thermometer.
Preferably, step (2) carries out the test of drilling again for adopting identical cutter rotating speed and the amount of feeding, when drilling is to a half of machined material thickness, stops the motion of cutter.Reason is that the temperature value that 1/2nd places of material are measured is the most accurate.Because the area of dissipation of material surface is large, the temperature of material surface is lower, and the temperature that measurement obtains and actual cut temperature spread are comparatively large, and after being machined to material internal certain depth, the temperature that measurement obtains is closer to actual cut temperature.
The detection of temperature described in step (4) adopts infrared thermometer.
Detect described in step (1) and be consistent with the position of the measurement point detected described in step (4).
Beneficial effect of the present invention: the existing measurement to cutting temperature only can obtain the temperature produced in cutting process, is difficult to the source effectively distinguishing cutting temperature; The present invention, by contrasting the cutting temperature and cutter and the fricative friction temperature of machined material that produce in conventional drilling process, can judge the ratio in heat in metal cutting shared by heat of friction comparatively accurately; By the Accurate Determining of originating to heat in metal cutting, be conducive to the rapid Optimum realizing cutter material in process, cutting parameter.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is described further:
Fig. 1 is cut schematic diagram;
Fig. 2 is the change of cutting temperature in process;
Fig. 3 is friction temperature change.
In figure: 1, cutter, 2, machined material.
Embodiment
For in research process, heat of friction accounts for the ratio of overall heat in metal cutting, carbide-tipped tool is adopted to carry out drilling test to carbon fibre composite.In material removal process, heat of friction accounts for an assay method for overall heat in metal cutting ratio, it is characterized in that comprising the steps:
(1) to arrange cutter rotating speed be 5000r/min and the amount of feeding is 30mm/min, compound substance thickness of slab is 12mm, tool diameter Φ 5mm, carry out cutting test, infrared thermometer is adopted to detect processing temperature, and to record the cutting time be 24s, result shows that the temperature in process first rises and declines afterwards.This is that adding man-hour to compound substance, temperature rises gradually because composite panel has certain thickness; After cutter bores compound substance, namely temperature declines gradually.Meanwhile, can find out that processing T.T. is 24s, when process time is 17s, processing temperature is up to 230 DEG C.
(2) carbide-tipped tool is adopted again to carry out drilling test to carbon fibre composite, compound substance thickness of slab is 12mm, adopt machined parameters to be cutter rotating speed 5000r/min, tool feeding amount 30mm/min carries out drilling processing, and drilling stops tool feeding and main shaft to rotate after being about 6mm.
(3) treat the machined material cooling 15min in step (2), thus make workpiece return to environment temperature.
(4) arrange the rotating speed 5000r/min consistent with step (1), amount of feed is zero simultaneously, and cutter is rotated
, and adopt infrared thermometer to detect temperature, continue 120s.Result shows, As time goes on, fricative temperature raises gradually.
(5) ratio between the temperature measured in the temperature measured in calculation procedure (1) and step (4), obtains the ratio that heat of friction accounts for heat in metal cutting.
Detect described in step (1) and be consistent with the position of the measurement point detected described in step (4).
According to the change of temperature in drilling process and the change of friction temperature, when can obtain different time points, heat of friction accounts for the ratio of overall heat in metal cutting.Such as, when the time is 17s, drilling temperature reaches mxm. 230 DEG C, and friction temperature is 101.5 DEG C simultaneously.The ratio of friction temperature and drilling temperature is the ratio that heat of friction accounts for drilling heat.Therefore, when the time is 17s, the ratio that heat of friction accounts for overall heat in metal cutting is 101.5/230 × 100%=44.1%.
The same time in Fig. 2 and Fig. 3, the temperature value one_to_one corresponding measured, within the overall cut time, can calculate the ratio of 0-24s, thus obtains the ratio that heat of friction accounts for overall heat in metal cutting, but the value at 17s place is the most accurate.
Claims (5)
1. in material removal process, heat of friction accounts for an assay method for overall heat in metal cutting ratio, it is characterized in that comprising the steps:
(1) cutter rotating speed and the amount of feeding are set, carry out drilling test, detect the temperature in drilling process, and record the cutting time;
(2) adopt identical cutter rotating speed and the amount of feeding to carry out the test of drilling again, when drilling is to machined material certain thickness, stop the motion of cutter;
(3) after the machined material in step (2) cools completely, arrange the rotating speed consistent with step (1), amount of feed is zero simultaneously, and cutter is rotated;
(4) when in step (3), the rotational time of cutter is consistent with the cutting time of recording in step (1), detected temperatures;
(5) ratio of the middle temperature variation of calculation procedure (1) and the middle temperature variation of step (4), obtains the ratio that heat of friction accounts for heat in metal cutting.
2. in a kind of material removal process according to claim 1, heat of friction accounts for the assay method of overall heat in metal cutting ratio, it is characterized in that: the detection of temperature described in step (1) adopts infrared thermometer.
3. in a kind of material removal process according to claim 1, heat of friction accounts for the assay method of overall heat in metal cutting ratio, it is characterized in that: step (2) carries out the test of drilling again for adopting identical cutter rotating speed and the amount of feeding, when drilling is to a half of machined material thickness, stop the motion of cutter.
4. in a kind of material removal process according to claim 1, heat of friction accounts for the assay method of overall heat in metal cutting ratio, it is characterized in that: the detection of temperature described in step (4) adopts infrared thermometer.
5. in a kind of material removal process according to claim 1, heat of friction accounts for the assay method of overall heat in metal cutting ratio, it is characterized in that: detect described in step (1) and be consistent with the position of the measurement point detected described in step (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510704385.4A CN105352631B (en) | 2015-10-27 | 2015-10-27 | Frictional heat accounts for the assay method of overall cutting heat ratio in a kind of process |
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| CN201510704385.4A CN105352631B (en) | 2015-10-27 | 2015-10-27 | Frictional heat accounts for the assay method of overall cutting heat ratio in a kind of process |
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| CN105352631A true CN105352631A (en) | 2016-02-24 |
| CN105352631B CN105352631B (en) | 2017-11-10 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694406A (en) * | 2009-10-09 | 2010-04-14 | 南京林业大学 | Device for testing cutting temperature of wood cutting tool |
| US20130195143A1 (en) * | 2012-01-31 | 2013-08-01 | Toshiba Kikai Kabushiki Kaisha | Method of measuring temperature in cutting process |
| CN103927450A (en) * | 2014-01-22 | 2014-07-16 | 黑龙江科技大学 | Cutting parameter determining method for combined machining of cutting tool and high-temperature alloy |
| CN104515714A (en) * | 2015-01-07 | 2015-04-15 | 北京林业大学 | High-speed high-temperature hydraulic load-adjustable knife-chip friction device and friction measuring method |
| CN104615876A (en) * | 2015-01-28 | 2015-05-13 | 大连理工大学 | Calculation method for cutting heat distribution coefficients of composite material |
-
2015
- 2015-10-27 CN CN201510704385.4A patent/CN105352631B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101694406A (en) * | 2009-10-09 | 2010-04-14 | 南京林业大学 | Device for testing cutting temperature of wood cutting tool |
| US20130195143A1 (en) * | 2012-01-31 | 2013-08-01 | Toshiba Kikai Kabushiki Kaisha | Method of measuring temperature in cutting process |
| CN103927450A (en) * | 2014-01-22 | 2014-07-16 | 黑龙江科技大学 | Cutting parameter determining method for combined machining of cutting tool and high-temperature alloy |
| CN104515714A (en) * | 2015-01-07 | 2015-04-15 | 北京林业大学 | High-speed high-temperature hydraulic load-adjustable knife-chip friction device and friction measuring method |
| CN104615876A (en) * | 2015-01-28 | 2015-05-13 | 大连理工大学 | Calculation method for cutting heat distribution coefficients of composite material |
Non-Patent Citations (1)
| Title |
|---|
| 李延铎 等: "对金属切削中温升的探究", 《天津理工学院学报》 * |
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