CN109754332A - The energy consumption model modeling method of lathe Milling Processes based on cutting force - Google Patents
The energy consumption model modeling method of lathe Milling Processes based on cutting force Download PDFInfo
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Abstract
The technical issues of energy consumption model modeling method for the lathe Milling Processes based on cutting force that the invention discloses a kind of, the practicability is poor for solving existing numerically-controlled machine tool military service Process Energy consumption forecast method.Technical solution is that the energy consumption of lathe Milling Processes is divided into no-load power consumption, cutting energy consumption and extra load energy consumption, carries out modeling and forecasting to three classes energy consumption respectively, the total energy consumption for predicting lathe Milling Processes is calculated with this.It is simple and easy due to being modeled using the method for cutting power calculation extra load power using milling cutting power calculating cutting power, and have stronger applicability to Milling Process.Error between the actual consumption of total energy consumption and lathe that the present invention predicts is no more than 2%, and precision of prediction is high, there is good reference value in actual processing.The method of the present invention can also be used in the acquisition of lathe energy efficiency, the calibration of the energy efficiency evaluation in mechanical processing process, lathe energy consumption etc., have broad application prospects, practicability is good.
Description
Technical field
The present invention relates to a kind of numerically-controlled machine tool military service Process Energy consumption forecast methods, more particularly to one kind based on cutting
The energy consumption model modeling method of the lathe Milling Processes of power.
Background technique
Requirement with modern manufacturing industry to efficiency is higher and higher, and lathe energy consumption receives significant attention in recent years, for reality
Existing higher manufacture efficiency, reliable energy consumption modeling is prerequisite, because it is mentioned for any optimization relevant to efficiency
For basis.The complex parts of aerospace largely use the processing method of numerical control milling, and the requirement on machining accuracy of complex parts
Height, processing efficiency is low, results in the problems such as energy consumption is big, and energy efficiency is low.
Document " number of patent application is 201210131766.4 Chinese invention patent " discloses a kind of numerically-controlled machine tool military service
Process Energy consumption forecast method, this method establish based on starting, zero load and processing three classes subprocess energy consumption prediction
Numerically-controlled machine tool military service process energy consumption prediction model.It is solved, and obtained by the energy consumption prediction model respectively to every class subprocess
To the energy consumption prediction result of entire numerically-controlled machine tool military service process.However, the calculating of the cutting energy consumption in its process is to pass through
The calculated cutting force calculating of empirical equation is got, and this method calculates complexity, and various coefficients, index, penalty coefficient are various, this
The kind computationally intensive low efficiency of method, and its cutting power is directly obtained by cutting force multiplied by cutting speed, and this algorithm is only fitted
For relatively simple turnery processing, for more complicated Milling Process, this calculation method is obviously no longer applicable in.Cause
This realizes and carries out precisely to the energy consumption of Milling Processes it is necessary to find a kind of new energy consumption model modeling method
Prediction reduces Milling Process energy consumption to realize, realizes that high-effect Milling Process provides theory support.
Summary of the invention
In order to overcome the shortcomings of existing numerically-controlled machine tool military service Process Energy consumption forecast method, the practicability is poor, and the present invention provides
A kind of energy consumption model modeling method of the lathe Milling Processes based on cutting force.This method is by lathe Milling Processes
Energy consumption is divided into no-load power consumption, cutting energy consumption and extra load energy consumption, modeling and forecasting is carried out to three classes energy consumption respectively, in terms of this
Calculate the total energy consumption for predicting lathe Milling Processes.Due to calculating cutting power using milling cutting power, using cutting power
The method for calculating extra load power is modeled, simple and easy, and has stronger applicability to Milling Process.The present invention is pre-
Error between the total energy consumption of survey and the actual consumption of lathe is no more than 2%, and precision of prediction is high, has in actual processing very well
Reference value.The method of the present invention can also be used in the acquisition of lathe energy efficiency, the energy efficiency evaluation in mechanical processing process, lathe energy
Consumption calibration etc., has broad application prospects, practicability is good.
The technical solution adopted by the present invention to solve the technical problems is: a kind of lathe Milling Process mistake based on cutting force
The energy consumption model modeling method of journey, its main feature is that the following steps are included:
Step 1: lathe Milling Processes energy consumption is divided into no-load power consumption, cutting energy consumption and extra load energy consumption, respectively
Modeling and forecasting is carried out to three classes energy consumption, the total energy consumption for predicting lathe Milling Processes is calculated with this.Its prediction model
Are as follows:
Ptotal=Pidle+Pcutting+Padditional (1)
Wherein, PtotalIndicate the total energy consumption of Milling Processes, PidleIndicate the no-load power consumption in Milling Processes,
PcuttingIndicate the cutting energy consumption in Milling Processes, PadditionalIndicate the extra load energy consumption in Milling Processes.
Step 2: no-load power consumption of the measurement lathe under different rotating speeds under non-cutting state, the data obtained is fitted,
Establish no-load power consumption model:
Pilde=f (n) (2)
Wherein, n is machine spindle speed.
Step 3: the foundation of the cutting energy consumption model based on cutting force.
Establish the cutting Force Model of Milling Process:
Wherein, Ft、Fr、FaRespectively tangential, radial direction and axial cutting force, Ktc,Krc,Kac,Kte,Kre,KaeFor cutting force
Coefficient, stFor feed engagement, ψ is the instantaneous immersion angle of cutting edge, and dS is the minimum length of cutting edge, and dz is that axial differential is long
Degree.
Establish the cutting energy consumption model of Milling Process:
The instantaneous cutting energy consumption model of Milling Process are as follows:
Pcutting=Pn+Pf=∫ dPn+∫dPf=V ∫ dFt+f/60000·∫(-dFx) (4)
Wherein, V is cutting speed, dFx=dFtcosψ+dFrSin ψ, f are the amount of feeding.
The cutting energy consumption model of Milling Process are as follows:
WhereinFor average cutting energy consumption, φpFor cross-sectional angle φp=2 π/N, N are the number of teeth of cutter.
Step 4: establishing the extra load energy consumption model of Milling Process:
Wherein, C0、C1For the coefficient that experimental data obtains,For the quadratic function for cutting energy consumption.
Step 5: the no-load power consumption P in the Milling Processes that step 1 is obtainedidle, the milling that step 2 obtains adds
Cutting energy consumption P during workcutting, extra load energy consumption P in the Milling Processes that step 3 obtainsadditional, substitute into
Total energy consumption prediction model:
The beneficial effects of the present invention are: the energy consumption of lathe Milling Processes is divided into no-load power consumption, cutting energy by this method
Consumption and extra load energy consumption are carried out modeling and forecasting to three classes energy consumption respectively, are calculated with this and predict lathe Milling Process mistake
The total energy consumption of journey.Due to calculating cutting power using milling cutting power, using the method for cutting power calculation extra load power
It is modeled, it is simple and easy, and have stronger applicability to Milling Process.The reality of total energy consumption and lathe that the present invention predicts
Error between energy consumption is no more than 2%, and precision of prediction is high, there is good reference value in actual processing.The method of the present invention
It can also be used in the acquisition of lathe energy efficiency, the calibration of the energy efficiency evaluation in mechanical processing process, lathe energy consumption etc., there is wide answer
With prospect, practicability is good.
It elaborates With reference to embodiment to the present invention.
Specific embodiment
For the present embodiment by taking milling is slotted as an example, material is No. 45 steel；Cutter diameter is the flat-bottomed cutter of 12mm.Using
YHVT850Z numerical control machining center is processed.
The present invention is based on the energy consumption model modeling method of the lathe Milling Processes of cutting force, specific step is as follows:
Step 1: lathe Milling Processes energy consumption is divided into no-load power consumption, cutting energy consumption and extra load energy consumption, respectively
Modeling and forecasting is carried out to three classes energy consumption, the total energy consumption for predicting lathe Milling Processes is calculated with this.Its prediction model
Are as follows:
Ptotal=Pidle+Pcutting+Padditional
Wherein, PtotalIndicate the total energy consumption of Milling Processes, PidleIndicate the no-load power consumption in Milling Processes,
PcuttingIndicate the cutting energy consumption in Milling Processes, PadditionalIndicate the extra load energy consumption in Milling Processes.
Step 2: no-load power consumption of the measurement lathe under different rotating speeds under non-cutting state, the data obtained is fitted.
Establish no-load power consumption model:
Pilde=f (n)
Wherein, n is machine spindle speed.
Step 3: the foundation of the cutting energy consumption model based on cutting force.
Step 1 establishes the cutting Force Model of Milling Process:
dFt(ψ, z)=KtedS+Ktcstsinψdz
dFr(ψ, z)=KredS+Krcstsinψdz
dFa(ψ, z)=KaedS+Kacstsinψdz
Wherein, Ft、Fr、FaRespectively tangential, radial direction and axial cutting force, Ktc,Krc,Kac,Kte,Kre,KaeFor cutting force
Coefficient, stFor feed engagement, ψ is the instantaneous immersion angle of cutting edge, and dS is the minimum length of cutting edge, and dz is that axial differential is long
Degree.
Step 2 establishes the cutting energy consumption model of Milling Process:
The instantaneous cutting energy consumption model of Milling Process are as follows:
Pcutting=Pn+Pf=∫ dPn+∫dPf=V ∫ dFt+f/60000·∫(-dFx)
Wherein V is cutting speed, dFx=dFtcosψ+dFrSin ψ, f are the amount of feeding.
The cutting energy consumption model of Milling Process are as follows:
WhereinFor average cutting energy consumption, φpFor cross-sectional angle φp=2 π/N, N are the number of teeth of cutter.
Step 4: establishing the extra load energy consumption model of Milling Process:
Wherein C0、C1For the coefficient that experimental data obtains,For the quadratic function for cutting energy consumption.
Step 5: the no-load power consumption P in the Milling Processes that step 1 is obtainedidle, the milling that step 2 obtains adds
Cutting energy consumption P during workcutting, extra load energy consumption P in the Milling Processes that step 3 obtainsadditional, substitute into
Total energy consumption prediction model:
Application Example.Fluting processing is carried out to No. 40 Steel materials on YHVT850Z numerical control machining center, use is above-mentioned
Method verifies its milling process.
(1) no-load power consumption model is established:
No-load power consumption model foundation is carried out according to step 2, is measured under different rotating speeds respectively under lathe non-cutting state
Power, the Fitting Calculation go out no-load power consumption model:
Pidle=0.000007n2-0.0025n+913.83
(2) foundation of the cutting energy consumption model based on cutting force:
Cut force modeling and cutting energy consumption modeling respectively according to step 3.
According to experiment the data obtained, cutting Force Model are as follows:
dFt(ψ, z)=KtedS+Ktcstsinψdz
dFr(ψ, z)=KredS+Krcstsinψdz
dFa(ψ, z)=KaedS+Kacstsinψdz
Wherein, Ft、Fr、FaRespectively tangential, radial direction and axial cutting force, being computed Cutting Force Coefficient is Krc=
3363.358 Kre=62.784, Kte=51.262, Ktc=2004.509, since axial force is not done work, so Kac,,KaeIt is not necessarily to
It calculates, stFor feed engagement, ψ is the instantaneous immersion angle of cutting edge, and dS is the minimum length of cutting edge, and dz is that axial differential is long
Degree.
According to cutting Force Model, the instantaneous cutting energy consumption model of Milling Process is calculated are as follows:
Pcutting=Pn+Pf=∫ dPn+∫dPf=V ∫ dFt+f/60000·∫(-dFx)
Wherein V is cutting speed, dFx=dFtcosψ+dFrSin ψ, f are the amount of feeding.
The cutting energy consumption model of Milling Process are as follows:
Wherein,For average cutting energy consumption, φpFor cross-sectional angle φp=2 π/N, N are the number of teeth of cutter.
(3) the extra load energy consumption model of Milling Process is established:
The extra load energy consumption model that Milling Process is established according to step 4 is computed its extra load energy consumption model are as follows:
(4) total energy consumption prediction model is established:
Total energy consumption prediction model is established according to step 5, establishes total energy consumption prediction model are as follows:
The precision that the method for the present invention predicts numerically-controlled machine tool Milling Processes energy consumption is higher (being shown in Table 1).
Energy consumption error under 1 different machining parameters of table
As can be seen that the error of the energy consumption of the practical milling process gone out with actual measurement is less than 2%, it is therefore, practical
There is good reference value in work.
Claims (1)
1. a kind of energy consumption model modeling method of the lathe Milling Processes based on cutting force, it is characterised in that including following step
It is rapid:
Step 1: lathe Milling Processes energy consumption is divided into no-load power consumption, cutting energy consumption and extra load energy consumption, respectively to three
Class energy consumption carries out modeling and forecasting, and the total energy consumption for predicting lathe Milling Processes is calculated with this；Its prediction model are as follows:
Ptotal=Pidle+Pcutting+Padditional (1)
Wherein, PtotalIndicate the total energy consumption of Milling Processes, PidleIndicate the no-load power consumption in Milling Processes, Pcutting
Indicate the cutting energy consumption in Milling Processes, PadditionalIndicate the extra load energy consumption in Milling Processes；
Step 2: no-load power consumption of the measurement lathe under different rotating speeds under non-cutting state, the data obtained is fitted, is established
No-load power consumption model:
Pilde=f (n) (2)
Wherein, n is machine spindle speed；
Step 3: the foundation of the cutting energy consumption model based on cutting force；
Establish the cutting Force Model of Milling Process:
Wherein, Ft、Fr、FaRespectively tangential, radial direction and axial cutting force, Ktc,Krc,Kac,Kte,Kre,KaeFor cutting force system
Number, stFor feed engagement, ψ is the instantaneous immersion angle of cutting edge, and dS is the minimum length of cutting edge, and dz is that axial differential is long
Degree；
Establish the cutting energy consumption model of Milling Process:
The instantaneous cutting energy consumption model of Milling Process are as follows:
Pcutting=Pn+Pf=∫ dPn+∫dPf=V ∫ dFt+f/60000·∫(-dFx) (4)
Wherein, V is cutting speed, dFx=dFtcosψ+dFrSin ψ, f are the amount of feeding；
The cutting energy consumption model of Milling Process are as follows:
WhereinFor average cutting energy consumption, φpFor cross-sectional angle φp=2 π/N, N are the number of teeth of cutter；
Step 4: establishing the extra load energy consumption model of Milling Process:
Wherein, C0、C1For the coefficient that experimental data obtains,For the quadratic function for cutting energy consumption；
Step 5: the no-load power consumption P in the Milling Processes that step 1 is obtainedidle, Milling Processes that step 2 obtains
In cutting energy consumption Pcutting, extra load energy consumption P in the Milling Processes that step 3 obtainsadditional, substitute into formula
(7), total energy consumption prediction model is obtained:
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