CN104608008B  A kind of acquisition methods of lathe main power system load loss coefficient  Google Patents
A kind of acquisition methods of lathe main power system load loss coefficient Download PDFInfo
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 CN104608008B CN104608008B CN201510092816.6A CN201510092816A CN104608008B CN 104608008 B CN104608008 B CN 104608008B CN 201510092816 A CN201510092816 A CN 201510092816A CN 104608008 B CN104608008 B CN 104608008B
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 B—PERFORMING OPERATIONS; TRANSPORTING
 B23—MACHINE TOOLS; METALWORKING NOT OTHERWISE PROVIDED FOR
 B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METALWORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
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Abstract
The present invention proposes a kind of load loss coefficient acquisition methods set up according to lathe main power system energy loss mathematical model.The method sets up input, the output power model of converter, mair motor and machine driven system first respectively, and it has been derived there rated power based on converter, rated power loss, radiator rated power, the main power system load loss systemcomputed model of the underlying parameter such as the quantity of every kind of transmission and load to weight ratio in efficiency under noload power under the rated power of mair motor, rated speed, rated speed, rated speed, and machine tool mechanical drive system.Only the lathe main power system noload power of underlying parameter and power measurement instruments measurement need to be input to the load loss coefficient that just can get lathe main power system in computation model above during Practical Calculation.This coefficient for the analysis of lathe energy expenditure, efficiency rating and part prediction and can optimize the important support of offer.
Description
Technical field
The present invention relates to machinery manufacturing technology field, more particularly to a kind of lathe main power system load loss coefficient
Acquisition methods.
Background technology
Manufacture system power consumption state analysis and its efficiency assess be manufacture system reduce energy expenditure, improve energy efficiency
Basis.Just rapidly growing in the world for the research of this manufacture system energy efficiency evaluation problem.Lathe is the equipment base of manufacture system
Plinth, its efficiency evaluation is the importance of manufacture system efficiency evaluation.At present, load loss coefficient can divide for lathe energy expenditure
Analysis, energy efficiency evaluation and the prediction of workpiece energy efficiency and optimization provide important support.
Hu Shaohua etc. is in paper《Characteristics of Additional Load Losses of Spindle
System of Machine Tools》In have studied in detail lathe main power system load energy loss and cutting power, main shaft
Rule between rotating speed and torque, is that lathe Energy Efficiency Analysis have established certain basis.But it does not have to load loss coefficient
Acquisition methods are made an explanation.
During existing research lathe energy efficiency evaluation problem, it is all to obtain lathe main power system load damage by testing measurement
Consumption coefficient.As disclosed in CN102179727A《Main transmission system of machine tool course of processing consumption information online test method》Propose
The method that load loss coefficient is obtained by cutting experiment.But, this method needs to do chip experiment on every lathe,
Experimentation is very loaded down with trivial details.And, cutting instrument price general charged is costly it is ensured that highprecision measurement process is also relatively more multiple
Miscellaneous.In addition, it is just infeasible for the lathe that a few thing platform cannot install cutting instrument.
Content of the invention
For deficiencies of the prior art, it is an object of the invention to provide one kind is according to lathe main power system energy
The load loss coefficient acquisition methods of amount loss Mathematical Models, solve the acquisition of lathe main power system load loss coefficient tired
Difficult problem.
For realizing above goal of the invention, the technical solution used in the present invention is as follows：
A kind of acquisition methods of lathe main power system load loss coefficient are it is characterised in that comprise the steps：
1) obtain the underlying parameter required for lathe main power system load figure of loss：Specified including converter
Power P_{1N}, rated power loss P_{veN}, radiator rated power P_{r}, the rated power P of mair motor_{N}, rated speed n_{N}, rated speed
Under noload power P_{0}(n_{N}), the efficiency eta under rated speed_{N}, and in machine tool mechanical drive system every kind of transmission quantity N
With load to weight ratio η '_{k}；
Wherein, the input of converter, output power model are rated power based on converter, rated power loss, dissipate
The power module of the underlying parameters such as hot device rated power, its expression formula is：P_{in}(n)=(1+b_{f}b_{u})P_{1}(n)+P_{r}
Wherein b_{u}=(P_{veN}P_{r})/P_{1N}, n≤n_{N}When,n≥n_{N}When, b_{f}=1, n_{N}Based on Rated motor rotating speed, n is
Mair motor rotating speed, P_{1}N () is the output of converter；
2) input underlying parameter：Input underlying parameter P_{1N}、P_{veN}、P_{r}, according to formula b_{u}=(P_{veN}P_{r})/P_{1N}Calculate frequency conversion
Device energy loss parameter b_{u}；Input underlying parameter P_{N}、P_{0}(n_{N})、η_{N}, according to formulaCalculate main electricity
Machine energy loss parameter b_{m}；Input underlying parameter N, η '_{k}, according to formulaCalculating machine drive system energy loss
Parameter alpha_{m}；Input underlying parameter n_{N}, according to formulaCalculate rotary speed parameter b_{f}Expression formula；
3) input is using the lathe main power system noload power P of power measurement instruments measurement_{inu}N (), calculates machine tool mechanical and passes
The noload power loss power P of dynamic system_{2u}(n)；
Wherein, the noload power loss power P of the machine tool mechanical drive system of machine tool_{2u}N the computing formula of () is：
The noload power loss power P of the machine tool mechanical drive system of frequency control lathe_{2u}N the computing formula of () is：
4) according to 2) 3) in data, the load loss coefficient a, b of automatic computing engine bed main power system.
Further, when lathe is machine tool, load figure of loss a, the computing formula of b is：
Further, when lathe is frequency control lathe, load figure of loss a, the computing formula of b is：
Further, when ignoring the machine driven system of frequency control lathe, the calculating of load figure of loss a, b is public
Formula is：
B=b_{f}b_{u}.
The present invention passes through theory analysis, and the input of converter, output power model are rated power based on converter, volume
Determine the power module of the underlying parameters such as power attenuation, radiator rated power, its expression formula is：
P_{in}(n)=(1+b_{f}b_{u})P_{1}(n)+P_{r}
Wherein b_{u}=(P_{veN}P_{r})/P_{1N}, n≤n_{N}When,n≥n_{N}When, b_{f}=1.
The input of mair motor, output power model are based on the noload power under rated power, rated speed, rated speed
Under the underlying parameter such as efficiency power module, its expression formula is：
Wherein,
According to document《Machining system energy response and its application》In based on every kind of biography in machine tool mechanical drive system
Move the input of the machine driven system of underlying parameter, the output power models such as secondary quantity and load to weight ratio, its expression formula is：P_{2}
(n)=α_{m}P_{c}+K_{n}N, wherein,
Finally, obtain lathe main power system cutting power P_{c}With input power P_{in}N the functional relationship of () is：Thus obtaining load loss coefficient a, the expression formula of b.
Compared to existing technology, the invention has the advantages that：
1st, the present invention saves and installs cutting instrument it is not necessary to measure the cutting power of lathe；Only need installation power measuring instrument,
The noload power of measurement lathe main power system.Easy enforcement easy and simple to handle.
2nd, the present invention need underlying parameter by check machine specifications, converter and motor nameplate or to motor produce
Producer's consulting obtains.After setting up a series of noload power data base of lathe main power systems, needing to obtain can during loading coefficient
Directly quote.The method is simple and practical, it is possible to resolve cannot obtain machine because cutting power measurement is numerous and diverse inaccurate in production process
Overall this difficult problem of energy consumption of bed.
3rd, compared with the cutting power of actual measurement, relative error range all exists the cutting power being obtained by the present invention
In 6%, therefore there is in real work preferable referential.
4th, the present invention obtains main transmission system of machine tool load loss coefficient, for research lathe entirety energy consumption, lathe energy consumption
Quota customizes and improves lathe energy efficiency and has broad application prospects.
Brief description
Fig. 1 is machine tool main power system sketch.
Fig. 2 is frequency control lathe main power system sketch.
Specific embodiment
With reference to the accompanying drawings and examples technical scheme is further described.
Frequency control lathe main power system is made up of converter, mair motor and machine driven system three part, and common
Lathe does not have converter link.As depicted in figs. 1 and 2, P_{in}For the input power of main power system, P_{1}Total for input mair motor
Power, P_{2}For the input power of machine driven system, P_{c}Input general power for system of processing.Main axis transmission system is by mair motor
Energy transmission to system of processing, promote executive component (cutter or workpiece) move.System of processing refers to be made up of cutter, workpiece etc.
System, the course of processing refers to the process of that system of processing is processed to workpiece, and this process can cause the energy of main transmission
Amount loss changes.
The present invention proposes a kind of acquisition methods of main transmission system of machine tool load loss coefficient, comprises the steps：
1) by checking machine specifications, converter and motor nameplate or to the consulting of motor manufacturer, obtaining lathe master
Basic data required for dynamical system load figure of loss：Rated power P including converter_{1N}, rated power loss
P_{veN}, radiator rated power P_{r}, the rated power P of mair motor_{N}, rated speed n_{N}, the noload power P under rated speed_{0}(n_{N})、
Efficiency eta under rated speed_{N}, and quantity N of every kind of transmission and load to weight ratio η ' in machine tool mechanical drive system_{k}；
2) input underlying parameter：Input underlying parameter P_{1N}、P_{veN}、P_{r}, according to formula b_{u}=(P_{veN}P_{r})/P_{1N}Calculate frequency conversion
Device energy loss parameter b_{u}；Input underlying parameter P_{N}、P_{0}(n_{N})、η_{N}, according to formulaCalculate main electricity
Machine energy loss parameter b_{m}；Input underlying parameter N, η '_{k}, according to formulaCalculating machine drive system energy loss
Parameter alpha_{m}；Input underlying parameter n_{N}, according to formulaCalculate rotary speed parameter b_{f}Expression formula；
3) input, using the lathe main power system noload power of power measurement instruments measurement, calculates lathe machine driven system
Noload power loss power P_{2u}(n).Wherein, the noload power loss power P of the machine tool mechanical drive system of machine tool_{2u}
N the computing formula of () is：
The noload power loss power P of the machine tool mechanical drive system of frequency control lathe_{2u}N the computing formula of () is：
4) according to step 2) and 3) in data, calculate obtain lathe main power system load figure of loss a, b.
During machine tool, load figure of loss a, the computing formula of b is：
Frequency control lathe main power system load figure of loss a, the computing formula of b is：
Frequency control machine tool mechanical drive mechanism due to having is very simple, and motor output shaft is directly output to processing system
System.When ignoring the machine driven system of frequency control lathe, frequency control lathe main power system load figure of loss
The computing formula of a, b is：
B=b_{f}b_{u}.
To sum up, the present invention sets up the input of converter, mair motor and machine driven system, output mould first respectively
Type, and be derived there rated power based on converter, rated power loss, radiator rated power, mair motor specified
Every in efficiency under noload power under power, rated speed, rated speed, rated speed, and machine tool mechanical drive system
Plant the main power system load loss systemcomputed model of the underlying parameters such as quantity and the load to weight ratio of transmission.The method is actual
Save the cutting instrument of installation during calculating it is not necessary to the cutting power of measurement lathe, only need to measure the sky of lathe main power system
Carry the load loss coefficient that power just can obtain lathe main power system according to computation model above.
Embodiment：
On Milling Machining Center PL700 lathe, damaged using the main power system load that the inventive method obtains in PL700
Consumption coefficient, its process is as follows：
1st, obtain basic data.
By checking machine specifications, converter and motor nameplate, and to the consulting of motor manufacturer, obtain milling and add
The basic data of work center PL700 lathe is as shown in table 1.
Table 1 Milling Machining Center PL700 machine tool basic data
2nd, basic data, calculating parameter are inputted.
Table 2 Milling Machining Center PL700 lathe parameter
3rd, error experiments.
The sky of different rotating speeds lower main axis on Milling Machining Center PL700 lathe, is measured with HIOKI3390C power instrument
Carry performance number.For clearly observational error experiment effect, using the thought of control variable, make lathe respectively in difference
Contrast error experiments under the speed of mainshaft, different cuttingin and the different amount of feeding.Experiment parameter is as shown in table 3.
Table 3 Milling Machining Center PL700 lathe experiment parameter
By contrasting error experiments, obtain load loss coefficient and relative error table, as shown in table 4.
Table 4 load loss coefficient and relative error：
By error experiments it can be seen that：Compared with the cutting power that the cutting power that the present invention obtains is measured with reality, phase
To range of error all in ± 6%, therefore there is in real work preferable referential.
Finally illustrate, above example only in order to technical scheme to be described and unrestricted, although with reference to relatively
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the technology of invention
Scheme is modified or equivalent, the objective without deviating from technical solution of the present invention and scope, and it all should be covered at this
In the middle of bright right.
Claims (1)
1. a kind of acquisition methods of lathe main power system load loss coefficient are it is characterised in that comprise the steps：
1) obtain the underlying parameter required for lathe main power system load figure of loss：Rated power including converter
P_{1N}, rated power loss P_{veN}, radiator rated power P_{r}, the rated power P of mair motor_{N}, rated speed n_{N}, under rated speed
Noload power P_{0}(n_{N}), the efficiency eta under rated speed_{N}, and quantity N of every kind of transmission and load in machine tool mechanical drive system
Lotus efficiency eta '_{k}；
Wherein, the input of converter, output power model are rated power based on converter, rated power loss, radiator
The power module of the underlying parameters such as rated power, its expression formula is：P_{in}(n)=(1+b_{f}b_{u})P_{1}(n)+P_{r}
Wherein b_{u}=(P_{veN}P_{r})/P_{1N}, n≤n_{N}When,n≥n_{N}When, b_{f}=1；n_{N}Based on Rated motor rotating speed, electricity based on n
Machine rotating speed, P_{1}N () is the output of converter；
2) input underlying parameter：Input underlying parameter P_{1N}、P_{veN}、P_{r}, according to formula b_{u}=(P_{veN}P_{r})/P_{1N}Calculate frequency converter energy
Loss parameter b_{u}；Input underlying parameter P_{N}、P_{0}(n_{N})、η_{N}, according to formulaCalculate mair motor energy
Loss parameter b_{m}；Input underlying parameter N, η '_{k}, according to formulaCalculating machine drive system energy loss parameter
α_{m}；Input underlying parameter n_{N}, according to formulaCalculate rotary speed parameter b_{f}Expression formula；
3) input is using the lathe main power system noload power P of power measurement instruments measurement_{inu}N (), calculates lathe mechanical drive train
The noload power loss power P of system_{2u}(n)；
Wherein, the noload power loss power P of the machine tool mechanical drive system of machine tool_{2u}N the computing formula of () is：
The noload power loss power P of the machine tool mechanical drive system of frequency control lathe_{2u}N the computing formula of () is：
4) according to 2) 3) in data, calculate lathe main power system load loss coefficient a, b；
When lathe is machine tool, load figure of loss a, the computing formula of b is：
When lathe is frequency control lathe, load figure of loss a, the computing formula of b is：
When ignoring the machine driven system of frequency control lathe, load figure of loss a, the computing formula of b is：
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CN102179727A (en) *  20110415  20110914  重庆大学  Online detection method of energy consumption information in machining process of main drive system of machine tool 
CN102637014A (en) *  20120427  20120815  重庆大学  Method for obtaining energy efficiency of main electromechanical driving system in machining process of numericallycontrolled machine tool 
CN102744649A (en) *  20120711  20121024  浙江大学  Noncutting energy obtaining method for main transmission system of numerically controlled lathe 
CN103235554A (en) *  20130329  20130807  重庆大学  Numerically controlled lathe processing workpiece energy consumption acquiring method based on NC (numerical control) codes 
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CN102179727A (en) *  20110415  20110914  重庆大学  Online detection method of energy consumption information in machining process of main drive system of machine tool 
CN102637014A (en) *  20120427  20120815  重庆大学  Method for obtaining energy efficiency of main electromechanical driving system in machining process of numericallycontrolled machine tool 
CN102744649A (en) *  20120711  20121024  浙江大学  Noncutting energy obtaining method for main transmission system of numerically controlled lathe 
CN103235554A (en) *  20130329  20130807  重庆大学  Numerically controlled lathe processing workpiece energy consumption acquiring method based on NC (numerical control) codes 
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