CN108426796A - A method of Difference Calculation cutting process strain rate is flowed based on grid - Google Patents
A method of Difference Calculation cutting process strain rate is flowed based on grid Download PDFInfo
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- CN108426796A CN108426796A CN201810055025.XA CN201810055025A CN108426796A CN 108426796 A CN108426796 A CN 108426796A CN 201810055025 A CN201810055025 A CN 201810055025A CN 108426796 A CN108426796 A CN 108426796A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/58—Investigating machinability by cutting tools; Investigating the cutting ability of tools
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0053—Cutting or drilling tools
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0688—Time or frequency
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Abstract
The invention discloses a kind of methods flowing Difference Calculation cutting process strain rate based on grid, include the following steps：Upper grid is processed on detected materials surface, some region of grid crosses shear plane while being deformed after the sliding of a period of time t since skid wire, and the length in this time of examination network in the directions x changes, and determines its deformation in the directions x；The speed that the distance and chip moved in the x-direction according to grid is moved along rake face determines grid through the time used in cutting deformation, and then calculates strain rate distribution in the x-direction；It repeats the above process, calculates the shear strain rate in the y-direction.The present invention goes understanding cutting process from the angle of flowing, can preferably study the changing rule of all kinds of physical parameters of cutting process.
Description
Technical field
The present invention relates to a kind of methods flowing Difference Calculation cutting process strain rate based on grid.
Background technology
Correct description material deformation is the research contents of Solid Mechanics in the mechanical behavior of different strain rate, modeling
The cutting process of property material is the large deformation process of a high temperature, high strain-rate, correctly recognizes the changing rule of its strain rate, with
And influence of the strain rate to other physical parameters is particularly significant to understanding cutting process, however cutting process cutting speed is fast, temperature
Degree is high so that the measurement of strain rate and observation are very inconvenient.
When plus load is more than yield limit permanent deformation will occur for metal material, usually characterize material with flow stress
Macroscopic deformation resistance when material is plastically deformed, the flow stress of material can increase with the raising of strain rate, and here it is materials
The strain rate effect of material, influence of the strain rate to yield stress or the lower flow stress of certain strain, people are from macroscopically obtaining
Two class rules：Power law and log law increase to show that two strain-rate-sensitivity exponents (m, λ) are used for weighing strain rate
When material reinforcing tendency, wherein m be power function strain-rate-sensitivity exponent, measurement be material draw up part there is necking down
Ability, that is, superplasticity ability, Song Yuquan etc. propose the method and specification for measuring m values；λ is that logarithmic strain rate sensitivity refers to
Number, for weighing sensitivity of the material to strain rate, Zheng Jian and Sun Chengyou have studied the contact of this two class index, propose with answering
Variability transition method measures the size of λ value.However under high strain-rate, influence and low strain dynamic of the strain rate to material flow stress
Difference in the case of rate, Campbell and Ferguson think for the materials such as aluminium, copper, zinc, mild steel, are more than a certain specific
Strain rate (about 103s-1) after, material flow stress will be changed linearly with strain rate, Li research aluminium alloy 1100 and
Lee etc. has also discovered this linear approximate relationship when studying the dynamic characteristic of 7050 aluminium alloys.Exactly this linear relationship is
Foundation is provided from the angle research cutting process of flowing.
High-speed cutting is because many merits are widely studied, however this fast feature of cutting speed is also limited to cutting process
Understanding.
Invention content
The present invention is to solve the above-mentioned problems, it is proposed that a kind of to flow Difference Calculation cutting process strain rate based on grid
Method, the present invention can go understanding cutting process from the angle of flowing.
To achieve the goals above, the present invention adopts the following technical scheme that：
A method of Difference Calculation cutting process strain rate is flowed based on grid, is included the following steps：
(1) upper grid is processed on detected materials surface, some region of grid is since skid wire, through a period of time t's
Shear plane is crossed after sliding while being deformed, and the length in this time of examination network in the directions x changes, and determines it in x
The deformation in direction；
(2) speed that the distance and chip moved in the x-direction within the above-mentioned time according to grid is moved along rake face, really
Grid is determined through the time used in cutting deformation, and then calculates strain rate distribution in the x-direction；
(3) it repeats the above process, calculates the shear strain rate in the y-direction.
Further, what strain rate measured is chip simulation.
Further, in the step (1), processing grid method is using laser processing to nano-grade size.
Further, x is to for along the direction of rake face, and the y is to the direction for vertical rake face.
Further, in the step (1), the deformation in the directions x is：
Wherein, xn-1Length for initial time grid in the directions x, xnIt is grid after a period of time in the side x
To length.
xnAnd xn-1Length obtained by the length for measuring two neighboring grid.It is assumed that stable cutting process, material internal material
Matter is uniform, and from the point of view of flowing, after previous grid crosses shear surface, it is original that the latter grid will be moved to front grid
Position, the length for measuring adjacent mesh changes and strained accordingly.
Further, in the step (2), grid is represented by through time t used in cutting deformation：
In formula：LxThe distance moved in the x-direction within the t times for grid；VcFor the speed that chip is moved along rake face, φ
For the angle of shear；V is cutting speed；α is tool orthogonal rake.
Further, the distance that grid moves in the x-direction within the t times is ignoring the case where laser beam processes line width
Under, be approximately equal to first grid the directions x measurement length xn-1。
Further, the speed V that chip is moved along rake facecCalculation formula is
Further, in the step (2), strain rate distribution in the x-direction is
Further, in the step (3), in the y-direction on shear strain rate process and the directions x on shear strain
The process of rate is identical.
Compared with prior art, beneficial effects of the present invention are：
The present invention goes understanding cutting process from the angle of flowing, can preferably study all kinds of physical parameters of cutting process
Changing rule.
The present invention goes understanding cutting process from the angle of flowing, can obtain the regularity of distribution of cutting process strain rate, and energy
Accomplish more coarse quantitative study, although still need to a large amount of theories integration with it is experimentally confirmed that really being ground from qualitative for strain rate
Study carefully and is transitioned into quantitative study and provides thinking.
Description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the improper restriction to the application for explaining the application.
Fig. 1 is movement and the speed triangle schematic diagram of grid；
Fig. 2 is the deformation schematic diagram of grid.
Specific implementation mode：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific implementation mode, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this hair
Bright each component or component structure relationship and the relative of determination, not refer in particular to either component or element in the present invention, cannot understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " shall be understood in a broad sense, and indicate may be a fixed connection,
Can also be to be integrally connected or be detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the present invention as the case may be,
It is not considered as limiting the invention.
The method that Difference Calculation cutting process strain rate is flowed based on grid, is included the following steps：
The first step：Upper grid is processed on detected materials surface, some region of grid is since skid wire, through a period of time
Shear plane is crossed after the sliding of t while being deformed, length x of the examination network in the directions xn-1And xn.The then change in the directions x
The calculation formula of shape is：
Second step：Grid is represented by through time t used in cutting deformation
In formula：LxThe distance moved in the x-direction within the t times for grid；VcFor the speed that chip is moved along rake face, φ
For the angle of shear；V is cutting speed；α is tool orthogonal rake.
Third walks：Calculating strain rate distribution in the x-direction is
It can similarly obtain along the upward shear strain rates of y and be
What strain rate measured is chip simulation.
Grid method is processed using laser processing to nano-grade size, the smaller precision of size is higher, but unsuitable too small.
X is to for along the direction of rake face, and the y is to the direction for vertical rake face.
xn-1For the length in a grid at a time directions x, the xnTo move L in the x-direction after the t timesxDistance
Length afterwards.
xnAnd xn-1Length measurement method be the length for measuring two neighboring grid.
Measure xnAnd xn-1Principle be：It is assumed that stable cutting process, material internal is uniform in material, from the point of view of flowing,
After previous grid crosses shear surface, the latter grid will be moved to the original position of front grid, as long as therefore measuring phase
Corresponding strain just can be obtained in the length variation of adjacent grid.
LxFor ignore laser beam process line width in the case of, be approximately equal to first grid the directions x measurement length
xn-1, i.e. Lx=xn-1。
The speed V that chip is moved along rake facecCalculation formula is
Embodiment：
As shown in Figure 1, processing the grid of nano-grade size using femtosecond laser, measuring the angle of tool orthogonal rake α and cutting
The angle of corner cut φ, and measure cutting speed V；
It is put down as shown in Fig. 2, some region of grid since beginning skid wire, crosses shearing after the sliding of a period of time t
Face is deformed simultaneously, through measuring the length of xn-1 and xn, that is, measures the length in the directions x of two neighboring grid, then grid
Deformation in the directions x is：
Elapsed time t is：
Comprehensive (1) (2) two formula, obtain be along the strain rate distribution in rake face direction
Similarly can shear strain rate on shear surface direction is
The foregoing is merely the preferred embodiments of the application, are not intended to limit this application, for the skill of this field
For art personnel, the application can have various modifications and variations.Within the spirit and principles of this application, any made by repair
Change, equivalent replacement, improvement etc., should be included within the protection domain of the application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (10)
1. a kind of method flowing Difference Calculation cutting process strain rate based on grid, it is characterized in that：Include the following steps：
(1) upper grid is processed on detected materials surface, some region of grid is since skid wire, the sliding through a period of time t
After cross shear plane while deforming, the length in this time of examination network in the directions x changes, and determines it in the directions x
Deformation；
(2) speed that the distance and chip moved in the x-direction within the above-mentioned time according to grid is moved along rake face, determines net
Lattice calculate strain rate distribution in the x-direction through the time used in cutting deformation；
(3) it repeats the above process, calculates the shear strain rate in the y-direction.
2. a kind of method flowing Difference Calculation cutting process strain rate based on grid as described in claim 1, it is characterized in that：
What strain rate measured is chip simulation.
3. a kind of method flowing Difference Calculation cutting process strain rate based on grid as described in claim 1, it is characterized in that：
In the step (1), processing grid method is using laser processing to nano-grade size.
4. a kind of method flowing Difference Calculation cutting process strain rate based on grid as described in claim 1, it is characterized in that：
X is to for along the direction of rake face, and the y is to the direction for vertical rake face.
5. a kind of method flowing Difference Calculation cutting process strain rate based on grid as described in claim 1, it is characterized in that：
In the step (1), the deformation in the directions x is：
Wherein, xn-1Length for initial time grid in the directions x, xnIt is grid after a period of time in the directions x
Length.
6. a kind of method flowing Difference Calculation cutting process strain rate based on grid as described in claim 1, it is characterized in that：
xnAnd xn-1Length obtained by the length for measuring two neighboring grid, it is assumed that stable cutting process, material internal is uniform in material,
From the point of view of flowing, after previous grid crosses shear surface, the latter grid will be moved to the original position of front grid,
The length of measurement adjacent mesh changes to be strained accordingly.
7. a kind of method flowing Difference Calculation cutting process strain rate based on grid as described in claim 1, it is characterized in that：
In the step (2), grid is represented by through time t used in cutting deformation：
In formula：LxThe distance moved in the x-direction within the t times for grid；VcFor the speed that chip is moved along rake face, φ is to cut
Corner cut；V is cutting speed；α is tool orthogonal rake.
8. a kind of method flowing Difference Calculation cutting process strain rate based on grid as claimed in claim 7, it is characterized in that：
The distance that grid moves in the x-direction within the t times exists in the case where ignoring laser beam processing line width equal to first grid
The measurement length x in the directions xn-1；
The speed V that chip is moved along rake facecCalculation formula is。
9. a kind of method flowing Difference Calculation cutting process strain rate based on grid as described in claim 1, it is characterized in that：
In the step (2), strain rate distribution in the x-direction is
10. a kind of method flowing Difference Calculation cutting process strain rate based on grid as described in claim 1, feature
It is：In the step (3), in the y-direction on shear strain rate process it is identical as the process of the shear strain rate on the directions x.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1145758A1 (en) * | 1982-11-30 | 1986-08-15 | Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения | Device for testing composite cutting tools |
| CN103831588A (en) * | 2014-02-28 | 2014-06-04 | 华南理工大学 | Large-strain extruding and cutting preparation method for ultra-fine grain or nanocrystalline metallic material |
| CN105117547A (en) * | 2015-08-25 | 2015-12-02 | 大连理工大学 | Simulation method for residual stress prediction of micro-milling nickel-based superalloy |
| CN106156430A (en) * | 2016-07-06 | 2016-11-23 | 大连理工大学 | A kind of micro-milling force modeling method based on tool wear effect |
-
2018
- 2018-01-19 CN CN201810055025.XA patent/CN108426796A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1145758A1 (en) * | 1982-11-30 | 1986-08-15 | Краматорский Научно-Исследовательский И Проектно-Технологический Институт Машиностроения | Device for testing composite cutting tools |
| CN103831588A (en) * | 2014-02-28 | 2014-06-04 | 华南理工大学 | Large-strain extruding and cutting preparation method for ultra-fine grain or nanocrystalline metallic material |
| CN105117547A (en) * | 2015-08-25 | 2015-12-02 | 大连理工大学 | Simulation method for residual stress prediction of micro-milling nickel-based superalloy |
| CN106156430A (en) * | 2016-07-06 | 2016-11-23 | 大连理工大学 | A kind of micro-milling force modeling method based on tool wear effect |
Non-Patent Citations (1)
| Title |
|---|
| KEGUO ZHANG 等: "Method of strain-rate difference calculation in high-speed metal cutting", 《MEASUREMENT》 * |
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Application publication date: 20180821 |