CN105930558B - A kind of acquisition methods of the first and second deformed area of high-speed cutting temperature - Google Patents
A kind of acquisition methods of the first and second deformed area of high-speed cutting temperature Download PDFInfo
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Abstract
The present invention relates to High-speed Machining Technology fields, disclose a kind of acquisition methods of the first and second deformed area of high-speed cutting temperature.The temperature history of cutting tools measurement point in cutting process is obtained by artifical Thermocouple method first；Wherein corresponding cutting temperature of any one time point as cutting tools measurement point temperature and is obtained into the temperature curve of measurement point when cutting temperature is stablized in the corresponding period according to the temperature history；The Three-dimensional Heat-transfer model for establishing cutter is emulated and obtains heat analysis result；Analysis obtains cutting tools measurement point temperature and second deformation zone temperature, obtains corresponding relationship between the two, in conjunction with the temperature curve of the measurement point, obtains second deformation zone temperature curve；Two-dimensional cutting simulation model is established, cutting simulation result is obtained；Analysis obtains the corresponding relationship under cutting temperature stable state between the first and second deformed area temperature, and then obtains primary deformation zone temperature curve.The present invention is simple, reliable and applicability is wide.
Description
Technical field
The present invention relates to High-speed Machining Technology fields, more specifically, in particular to a kind of high-speed cutting first and second
The acquisition methods of deformed area temperature.
Background technique
High-speed cutting is using high-intensitive cutter, by improving cutting speed and feed speed, come improve material-removal rate,
The quality of machining accuracy and finished surface is a kind of advanced manufacturing technology with high efficiency, high quality and low cost.
It in view of the advantage of high-speed cutting processing, furthers investigate high speed machining mechanism and is of great significance, cutting temperature is high
The important component of fast cutting scheme.All the time, cutting temperature is a fuzzy concept: cutting heat is in the form of field
It is distributed on workpiece, on cutter, in chip and in cutting region, however every place's temperature is all referred to as cutting temperature.Actually workpiece
On upper, cutter, the temperature in chip and cutting region be different, although region area is small, there are high gradient, therefore basis
The difference of research object needs to treat respectively.
The big basic act of the two of high-speed machining process has shearing slip deformation and knife-bits friction, and wherein shearing slip deforms
The primary deformation zone of workpiece Yu chip junction is occurred mainly in, knife-bits friction occurs in cutter rake face and chip compressive plane
The second deformation zone of contact position.When studying shearing slip deformation and knife-bits friction behavior, the acquisition for being directed to temperature is asked
Topic, that is to say, that need to obtain the temperature of the first and second deformed areas.
Acquisition towards cutting temperature, common methods have natural thermocouple method, artifical Thermocouple and radiant heat method etc., wherein
Temperature obtained by natural thermocouple is the maximum temperature of entire cutting region and the difference of environment temperature, is a kind of temperature difference, can not be thin
Point；Artifical Thermocouple method can only obtain workpiece or cutting tools measurement point temperature, cannot obtain the first and second deformed area temperature；Hot spoke
The method of penetrating can obtain temperature field, but because cutting region area is small, cannot carefully distinguish microcell high gradient temperature field.
Summary of the invention
Based on this, the present invention obtains the reality of measurement point temperature using thermocouple for uncomfortable problem of the existing technology
Proved recipe method provides a kind of deformation of high-speed cutting first and second in conjunction with the emulation mode that can carefully distinguish microcell high gradient temperature field
The acquisition methods of area's temperature.The technical solution adopted by the present invention are as follows:
The acquisition methods of a kind of the first and second deformed area of high-speed cutting temperature, it is characterised in that: this method includes following
Step:
Step 1: the temperature history of cutting tools measurement point in cutting process is obtained by artifical Thermocouple method；
Step 2: according to the temperature history, when cutting temperature is stablized in the corresponding period, when will be wherein any one
Between put corresponding cutting temperature as cutting tools measurement point temperature, obtain the temperature curve of measurement point；
Step 3: establishing the Three-dimensional Heat-transfer model of cutter, emulated simultaneously in the thermal force that cutting zone applies from low to high
Obtain different heat analysis results；
Step 4: according to the different heat analysis as a result, obtaining a series of corresponding with time point described in step 2 three
Cutting tools measurement point temperature and rake face temperature (i.e. second deformation zone temperature) in heat transfer model are tieed up, is obtained therebetween by fitting
Functional relation, change linearly rule, as the formula (1), and in conjunction with the temperature curve of the measurement point, obtain the second deformation
Area's temperature curve；
(1)
In formula,For second deformation zone temperature,For measurement point temperature,WithFor constant, the knife that experiment is obtained
Tool measurement point temperature is brought into formula (1), and second deformation zone temperature can be calculated；
Step 5: establishing two-dimensional cutting simulation model, obtain cutting simulation result；
Step 6: according to the cutting simulation as a result, analysis obtain under cutting temperature stable state second deformation zone temperature with
Corresponding relationship between primary deformation zone temperature, as the formula (2), exponentially function changing rule, deforms in conjunction with described second
Area's temperature curve, and then obtain primary deformation zone temperature curve；
(2)
In formula,For primary deformation zone temperature,、WithFor constant, the second deformation that will be acquired by formula (1)
Area's temperature is brought into formula (2), and primary deformation zone temperature can be calculated.
In the step 1, K-type thermocouple is arranged in the measurement point below cutter rake face, to obtain the survey
Temperature history of the amount point under different cutting parameters.
In the step 3, the Three-dimensional Heat-transfer model of cutter is established using Ansys Workbench software.
In the step 5, the two-dimensional cutting simulation model is established using Advantedge FEM simulation software.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention solves the problems, such as that temperature difficulty in cutting region obtains for many years in high-speed cutting field.Cutting region has area micro-
It is the characteristics of small and high gradient Temperature Distribution, hard to work using the first and second deformed area temperature of conventional temperature-measurement method acquisition, this
Invention will acquire process and be divided into three steps, and the experiment of reasonable utilization thermocouple temperature measurement obtains the substantivity and reliability of measurement point temperature,
Receive finite element simulation method to the accuracy and high information quantity of tiny area solution of Temperature.
2, the process of present invention acquisition deformed area temperature is succinctly effective.Artifical Thermocouple method belongs in cutting temperature measurement
In mature technology, it is easy to accomplish；Cutter heat transmits finite element model and cutting physics Building of Simulation Model process and uncomplicated, tool
Have the characteristics that at low cost and quick；It combines both, the acquisition of local film micro area cutting temperature may be implemented.
3, the applicability of acquisition methods of the present invention is good.The present invention is suitable for complete the plastic metal of chip forming procedure
Material, nonmetallic materials；The present invention be suitable for chip on, on workpiece, in flank etc. other region cutting temperatures acquisition；This
Invention is suitable for the measurement occasion of other plastic deformation heats, such as rolling, forging and stamping, punching press deformation occasion.
Detailed description of the invention
Fig. 1 is the flow chart of the first and second deformed area of high-speed cutting of the present invention method for acquiring temperature.
Fig. 2 is cutting experiment schematic diagram of the present invention.
Fig. 3 is temperature thermocouple location arrangements figure of the present invention.
Fig. 4 is that the present invention passes through thermocouple cutting tools measurement point Temperature history obtained.
Fig. 5 is the cutting tools measurement point temperature curve that the cutting temperature that the present invention chooses stablizes the moment.
Fig. 6 is the thermo parameters method figure for the three-dimensional cutter heat transfer model that present invention emulation obtains.
Fig. 7 is the corresponding relationship of the measurement point temperature that the present invention obtains and second deformation zone temperature.
Fig. 8 is the second deformation zone temperature curve that the present invention acquires.
Fig. 9 is obtained the first and second deformed area thermo parameters method figures by present invention emulation.
Figure 10 is the corresponding relationship for the first and second deformed area temperature that the present invention obtains.
Figure 11 is the primary deformation zone temperature curve that the present invention obtains.
Description of symbols: 1- workpiece, 2- cutter, I- primary deformation zone, II- second deformation zone.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give presently preferred embodiments of the present invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is make to understand the disclosure it is more thorough complete
Face.
Unless otherwise defined, all technical and scientific terms used herein and the technology for belonging to technical field
The normally understood meaning of personnel is identical.Term as used herein in the specification of the present invention is intended merely to describe specific reality
Apply the purpose of example, it is not intended that in the limitation present invention.
The present embodiment is by taking Ti-6Al-4V titanium alloy high speed orthogonal cutting as an example, by the first, second deformed area in cutting process
Mean temperature represent shear-deformable temperature and knife-bits friction temperature.Wherein, primary deformation zone is workpiece and chip junction
The deformed area of shearing slip occurs, second deformation zone is the deformed area of cutter rake face and chip compressive plane contact position.
As shown in fig.1, a kind of acquisition methods of the first and second deformed area of high-speed cutting provided by the invention temperature, it should
Method the following steps are included:
Step 1: the temperature history of cutting tools measurement point in cutting process is obtained by artifical Thermocouple method, i.e., by K-type thermoelectricity
It is occasionally arranged in the measurement point (with reference to shown in Fig. 3) of cutting tool, to obtain measurement point described in multiple groups in different cutting parameters
Under temperature history.
In the present embodiment, cutting experiment is carried out using orthogonal cutting method, experiment schematic diagram is as shown in Figure 2.Cutting system
System uses 400 lathe of DMG-NEF, and SECO-SCACL1616H09 and material are the knife bar of No. 45 steel normalizings, blade SECO-
CCMT09T302-F2-HX(anterior angle is 0 °, and relief angle is 7 °, and material is close to domestic YG6).Temp measuring system uses K-type thermocouple
(heating wire diameter 0.5mm, length 100mm；0-1300 DEG C of temperature-measuring range), HT-901 digital displaying meter；The orthogonal cutting of setting is real
Testing parameter cutting speed is 10-160m/min, and amount of feeding 0.07mm/r, 0.09 mm/r and 0.11 mm/r, cutting width are
3mm.The temperature history of acquired measurement point is as shown in Figure 4.
Step 2: according to the temperature history, when cutting temperature is stablized in the corresponding period, when will be wherein any one
Between put corresponding cutting temperature as cutting tools measurement point temperature and obtain the temperature curve of measurement point.
In the present embodiment, cutting tools measurement point temperature when the corresponding cutting temperature of 6s being taken to stablize as cutting temperature, finally
The temperature curve of cutting tools measurement point is as shown in Figure 5 when the cutting temperature of acquisition is stablized.
Step 3: establishing the Three-dimensional Heat-transfer model of cutter, emulated simultaneously in the thermal force that cutting zone applies from low to high
Obtain different heat analysis results.
In the present embodiment, the Three-dimensional Heat-transfer model of cutting tool is established using Ansys Workbench software, wherein workpiece
Material is Ti-6Al-4V, thermal coefficient 6.8W/m2DEG C, specific heat be 661J/Kg DEG C, density 4440Kg/m3；Cutter material
For hard alloy, thermal coefficient is 71 W/m2DEG C, J/Kg DEG C of specific heat 452,15600 Kg/m of density3；Arbor material is No. 45
Steel, thermal coefficient are 70 W/m2DEG C, specific heat be 419 J/Kg DEG C, density is 7800 Kg/m3.The cell type of setting is
Solid70, analysis mode be heat-transient fashion, setting initially and 20 DEG C of reference temperature, and participate in cut rake face on apply
Add thermal force from low to high, and loads cross-ventilation load in other faces.Emulation obtains the temperature field under a certain cutting parameter
Distribution is as shown in Figure 6.
Step 4: according to the different heat analysis as a result, obtaining a series of corresponding with time point described in step 2 three
Cutting tools measurement point temperature and rake face temperature (i.e. second deformation zone temperature) in heat transfer model are tieed up, is obtained therebetween by fitting
Functional relation obtain second deformation zone temperature curve and in conjunction with the temperature empirical curve of the measurement point.
In the present embodiment, the rake face temperature is that the thermal force of cutting zone, the cutting tools measurement are applied to when emulation
Point temperature is the mean temperature of the cutting tools measurement point taken out from simulation result, temperature value and corresponding relationship such as Fig. 7 institute of the two
Show, the corresponding relationship of the two can be parsed, such as formula (3):
(3)
The second deformation zone temperature curve finally obtained is as shown in Figure 8.
Step 5: establishing two-dimensional cutting simulation model, obtain cutting simulation result.
In the present embodiment, the two-dimensional cutting simulation model is established using Advantedge FEM simulation software.It emulated
The setting of journey includes material model, cutter material model, tool geometrical parameter, cutting parameter and grid dividing parameter etc..Wherein
0 ° of tool orthogonal rake, 7 ° of relief angle, cutting edge radius is 0.02mm, and material uses hard alloy, rake face length and flank length
It is 2mm；Cutting speed is 10-160m/min, amount of feeding 0.07-0.11mm/r；Workpiece size is 4mmx1mm；Workpiece with
The minimum grid division of cutter uses software default parameter having a size of 0.005mm, coefficient of friction.In calculated result, cutting speed
The first and second deformed area thermo parameters methods under the conditions of 160m/min and amount of feeding 0.07mm/r are as shown in Figure 9.
Step 6: according to the cutting simulation as a result, analysis obtain under cutting temperature stable state primary deformation zone temperature with
Corresponding relationship between second deformation zone temperature in conjunction with the second deformation zone temperature curve, and then obtains primary deformation zone temperature
It writes music line.
In the present embodiment, the corresponding relationship between primary deformation zone temperature and second deformation zone temperature is as shown in Figure 10, solution
It separates out such as formula (4):
(4)
The primary deformation zone temperature curve finally obtained is as shown in figure 11.
The present invention is based on the thermally conductive inverse estimation method of finite element by thermocouple measuring temperature, and corresponding is a kind of heat biography
Indirect problem, the i.e. temperature and its rule that changes with time of the certain point on inside known object or surface or several points are led, by asking
Heat Conduction Differential Equations are solved, heat flow density, temperature or the thermal physical property parameter at object edge interface or the convection transfer rate on surface are found out,
Entire method for acquiring temperature is simple, reliable, it is easy to accomplish.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (4)
1. a kind of acquisition methods of the first and second deformed area of high-speed cutting temperature, it is characterised in that: this method includes following step
It is rapid:
Step 1: the temperature history of cutting tools measurement point in cutting process is obtained by artifical Thermocouple method；
Step 2:, will wherein any one time point when cutting temperature is stablized in the corresponding period according to the temperature history
Temperature of the corresponding cutting temperature as cutting tools measurement point, obtains the temperature curve of measurement point；
Step 3: establishing the Three-dimensional Heat-transfer model of cutter, emulated and obtained in the thermal force of cutting zone application from low to high
Different heat analysis results；
Step 4: according to the different heat analysis as a result, obtaining a series of three-dimensional biographies corresponding with time point described in step 2
Cutting tools measurement point temperature and second deformation zone temperature in thermal model obtain functional relation between the two by fitting, linearly
Changing rule obtains second deformation zone temperature curve as shown in formula (1), and in conjunction with the temperature curve of the measurement point；
Tp=a1Tc+b1 (1)
In formula, TpFor second deformation zone temperature, TcFor measurement point temperature, a1And b1For constant, the cutting tools measurement point that experiment is obtained
Temperature is brought into formula (1), and second deformation zone temperature can be calculated；
Step 5: establishing two-dimensional cutting simulation model, obtain cutting simulation result；
Step 6: according to the cutting simulation as a result, analysis obtains second deformation zone temperature and first under cutting temperature stable state
Corresponding relationship between deformed area temperature, as shown in formula (2), exponentially function changing rule, in conjunction with the second deformation zone temperature
It writes music line, and then obtains primary deformation zone temperature curve；
In formula, TsFor primary deformation zone temperature, a2、b2And c2For constant, the second deformation zone temperature acquired by formula (1) is brought into
In formula (2), primary deformation zone temperature can be calculated.
2. the acquisition methods of the first and second deformed area of high-speed cutting according to claim 1 temperature, it is characterised in that: institute
It states in step 1, K-type thermocouple is arranged in the measurement point below cutter rake face, to obtain the measurement point in difference
Temperature history under cutting parameter.
3. the acquisition methods of the first and second deformed area of high-speed cutting according to claim 1 or 2 temperature, feature exist
In: in the step 3, the Three-dimensional Heat-transfer model of cutter is established using Ansys Workbench software.
4. the acquisition methods of the first and second deformed area of high-speed cutting according to claim 3 temperature, it is characterised in that: institute
It states in step 5, the two-dimensional cutting simulation model is established using Advantedge FEM simulation software.
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| CN107977528B (en) * | 2017-12-18 | 2020-03-13 | 重庆大学 | Temperature prediction method for lead screw cyclone milling area |
| CN108595877B (en) * | 2018-05-09 | 2022-08-30 | 中国工程物理研究院激光聚变研究中心 | Method for measuring KDP crystal cutting temperature |
| CN109359335B (en) * | 2018-09-14 | 2023-04-18 | 中国林业科学研究院木材工业研究所 | Method for predicting critical temperature load of outer edge of woodworking circular saw blade |
| CN109732407B (en) * | 2019-03-11 | 2019-12-20 | 广东工业大学 | Ultra-precise cutting temperature prediction method and system |
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