KR20160080978A - Energy Consumtion Evaluation Method For CNC - Google Patents

Energy Consumtion Evaluation Method For CNC Download PDF

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Publication number
KR20160080978A
KR20160080978A KR1020140193839A KR20140193839A KR20160080978A KR 20160080978 A KR20160080978 A KR 20160080978A KR 1020140193839 A KR1020140193839 A KR 1020140193839A KR 20140193839 A KR20140193839 A KR 20140193839A KR 20160080978 A KR20160080978 A KR 20160080978A
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South Korea
Prior art keywords
energy
axis
feed
machine tool
axis feed
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KR1020140193839A
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Korean (ko)
Inventor
윤여찬
안성훈
이장엽
김민수
신용준
윤해성
김은섭
김성용
조정훈
원재윤
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현대위아 주식회사
서울대학교산학협력단
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Priority to KR1020140193839A priority Critical patent/KR20160080978A/en
Publication of KR20160080978A publication Critical patent/KR20160080978A/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply

Abstract

Disclosed is a method of evaluating energy consumption of a machine tool capable of objectively and quickly evaluating energy consumption of a machine tool. The method of evaluating energy consumed in a machine tool includes: a step of calculating predetermined energy having a predetermined value by time; a step of calculating variable energy of which a value is changed by a variable other than time; and a step of calculating the total consumed energy by adding the predetermined energy and variable energy together.

Description

[0001] The present invention relates to an energy consumption evaluation method for a CNC machine tool,

The present invention relates to an energy consumption evaluation method capable of objectively and quickly evaluating energy consumption of a machine tool.

Machine tools, such as commonly used CNC (Computerized Numerical Control) lathes, have high energy consumption, so energy consumption can be considered as a standard for selecting manufacturers.

However, the standard for calculating energy consumption is not clear up to now. Especially, the method applied by Japan Machine Tool Manufacturing Association can not be judged to be objective because it is based on energy calculation when specimens are processed in specific form .

In addition, the German Machine Tool Association's method evaluates the evaluation score of the energy optimization module throughout the lifetime of the machine, so it can not be regarded as the accurate output of the consumed energy.

The present invention provides an energy consumption evaluation method that can objectively and quickly evaluate the energy consumption of a machine tool.

A method for evaluating energy consumption of a machine tool according to the present invention includes the steps of: calculating a constant energy having a constant value with time; Calculating a variable energy whose value is changed by a variable other than the time; And calculating total energy consumption by summing the constant energy and the variable energy.

Here, the step of calculating the constant energy may include calculating energy consumed in the chip conveyor; Calculating energy consumed by the coolant pump; And calculating energy consumed in the atmosphere.

And the energy consumed by the chip conveyor can be determined according to the following equation.

[Equation 1]

(E_chip conveyor = c_chip conveyor * t [WH] where c_chip conveyor is a constant according to the characteristics of the machine tool, and t is time.

The energy consumed by the coolant pump can be determined according to the following equation.

[Equation 2]

E_ coolant pump = c_ coolant pump * t [WH] (wherein, c_ coolant pump is a constant, t is the time according to the characteristics of the machine tool).

Further, the energy consumed in the atmosphere may be determined according to the following equation.

[Equation 3]

E_ air energy = energy c_ air * t [WH] (wherein, c_ air energy is constant in accordance with the characteristics of the machine tool, t is the time)

The step of calculating the variable energy may include calculating energy consumed during processing; Calculating energy consumed in the main shaft; And calculating energy consumed in the transfer axis.

Further, the energy consumed in the machining can be determined according to the following equation.

[Equation 4]

= E_ processing (processing C1_ * MRR + C2_ processing) * t [W] (wherein, C1_ processing and C2_ processing is constant in accordance with the characteristics of the machine tool)

In addition, the energy consumed in the main axis can be determined according to the following equation.

[Equation 5]

E_main axis = (c_main axis * rpm) * t [W] (where c_main axis is a constant according to the characteristics of the machine tool, rpm is the number of revolutions per minute of the material supply roller).

Further, the energy consumed in the transport axis can be determined according to the following equation.

[Equation 6]

E_transport axis = E_ + x axis feed + E_- x axis feed + E_z axis feed [W] where E_ + x axis feed , E_- x axis feed , E_z axis feed are + x axis, -x Axis and z-axis).

Further, the energy consumed during the transportation in the + x axis, the -x axis, and the z axis can be determined according to the following equation.

[Equation 7]

E_ + x axis feed = (C1_ + x axis feed * FEED + C2_ + x axis feed ) * t [W]

[Equation 8]

E_ -x axis feed = (C1_- x axis feed * FEED + C2_ -x axis feed ) * t [W]

[Equation 9]

E_z axis feed = (C1_z axis feed * FEED + C2_z axis feed ) * t [W] where C1_ + x axis feed , C2_ + x axis feed , C1_x axis feed , C2_x axis feed , C1_z axis feed and C2_z axis feed are constants that are determined by the characteristics of the machine tool, respectively).

The method of evaluating the machine tool energy consumption according to the present invention separates and functions the energy consumed by each machine tool, thereby objectifying the overall energy consumption evaluation and shortening the required time, thereby increasing the efficiency.

1 is a block diagram of an apparatus for evaluating machine tool energy consumption according to an embodiment of the present invention.
2 is a flowchart illustrating a method of evaluating machine tool energy consumption according to an embodiment of the present invention.
FIG. 3 is a graph showing a processed energy consumption amount with respect to a material removal rate in a method of evaluating machine tool energy consumption according to an embodiment of the present invention.
4 is a graph showing spindle energy consumption for rpm in a method of evaluating machine tool energy consumption according to an embodiment of the present invention.
FIG. 5A is a graph showing energy consumption of the transfer axis for x-axis supply in the method of evaluating machine tool energy consumption according to the embodiment of the present invention. FIG.
FIG. 5B is a graph showing the energy consumption of the transport axis for the z-axis feed in the method of evaluating machine tool energy consumption according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

1 is a block diagram of an apparatus for evaluating machine tool energy consumption according to an embodiment of the present invention.

Referring to FIG. 1, a system 100 for evaluating machine tool energy consumption according to an embodiment of the present invention includes a meter 110 coupled to a machine tool 10, And a control unit 120 for calculating an energy consumption amount of the battery.

First, the machine tool 10 refers to a computer numerically controlled machine such as a CNC (Computerized Numerical Control) machine that is commonly used. Since the machine tool 10 has energy consumption different from manufacturer to manufacturer, a method for evaluating machine tool energy consumption according to an embodiment of the present invention provides a prediction model for the energy consumption evaluation. In addition, the machine tool 10 may be inserted with a G code in order to perform the energy consumption evaluation according to the embodiment of the present invention.

The meter 110 may be connected to a No Fuse Break (NFB) terminal in the steel drum of the machine tool 10. [ The meter 110 measures the power in the plant machine 10 from the terminal. The meter 110 is formed in the black box type and can be installed in any equipment, thereby ensuring versatility. Also, the meter 110 measures the electric power and transmits the measured information to the controller 120.

The controller 120 is connected to the meter 110 and the machine tool 10. The controller 120 measures a voltage, a current, and a power factor through an internal program (for example, a laptop and a laptop). Also, as will be described later, the controller 120 extracts energy consumption using an internal program (for example, Matlab) through the information, and functions as a consumption pattern.

Hereinafter, a method for evaluating machine tool energy consumption according to an embodiment of the present invention will be described in detail.

2 is a flowchart illustrating a method of evaluating machine tool energy consumption according to an embodiment of the present invention.

Referring to FIG. 2, a method for evaluating machine tool energy consumption according to an embodiment of the present invention includes a chip conveyor energy calculating step S1, a cutting oil pump energy calculating step S2, an atmospheric energy calculating step S3, (S4), a main axis energy calculating step (S5), a feed axis energy calculating step (S6), and a total consumed energy calculating step (S7). Here, the previous steps S1 to S6 of the total consumption energy calculation step S7 are irrelevant to the order, and can be performed simultaneously or sequentially. Hereinafter, the respective steps of FIG. 2 will be described with reference to FIGS. 3 to 5 together.

The chip conveyor energy calculating step S1 is a step of calculating energy used in the chip conveyor in the machine tool 10. [ The chip conveyor means an operation for separating and transferring a chip, which is a byproduct generated in the course of processing the metal, separately. The chip conveyor operates on / off and consumes a certain amount of power. Therefore, the chip conveyor energy (E_ chip conveyor ) can be functionized as follows.

[Equation 1]

(E_ Chip Conveyor = c_ Chip Conveyor * t [WH]

Here, c_chip conveyor is a constant according to the characteristics of the machine tool 10, and t means time. For example, the value of the c_chip conveyor may be 252.05.

The cutting oil pump energy calculating step S2 is a step of calculating the energy used in the process for supplying the cutting oil from the coolant pump in the machine tool 10. [ In addition, the supply of the coolant supplies the cutting oil to the workpiece to increase the precision of the workpiece and to extend the service life of the tool, and consume a certain amount of electric power in operation, so that the energy of this step (E_cutter oil pump ) can be functioned as follows.

[Equation 2]

E_ Coolant pump = c_ Coolant pump * t [WH]

Here, c_ coolant pump is a constant according to the characteristics of the machine tool (10), t is the time. For example, the value of the c - coolant pump may be 1688.61.

The atmospheric energy calculating step S3 consumes a certain amount of electric power per hour as energy required during standby operation of the machine tool 10. [ Therefore, the atmospheric energy (E_air energy ) can be functioned as follows.

[Equation 3]

E_Air energy = c_Air energy * t [WH]

Here, c_air energy is also a constant according to the characteristics of the machine tool 10, and t means time. For example, the value of c_air energy may be 1380.68.

The values of the chip conveyor energy (E_ chip conveyor ), coolant pump energy (E_cutting oil pump ), and atmospheric energy (E_air energy ) are not changed by other variables except time. Accordingly, the energy can be defined as a constant energy.

FIG. 3 is a graph showing a processed energy consumption amount with respect to a material removal rate in a method of evaluating machine tool energy consumption according to an embodiment of the present invention.

Referring to Figure 3, the machining energy calculating step (S4), brown, green, and another machining energy (E_ processing) in three different machine tool 10 is shown with different colors of blue in the material removal rate (Material Removal Rate , And MRR), which are linearly related to each other.

[Equation 4]

= E_ processing (processing C1_ * MRR + C2_ processing) * t [W]

Here, C1_ is a constant in accordance with the characteristics of both the process and C2_ machining machine tool 10, for example, in the case of a machine tool 10, the graph indicated by the brown C1_ processing may be 0.017519 and C2_ processing 200.3364.

In addition, the material removal rate (MRR) can be summarized as follows.

[Equation 5]

MRR = v * A

= F rev * V c * d * (1-d / (2r))

? F rev * V c * d

Where v is the feed rate, A is the cross-sectional area, f rev is the feed per revolution, V c is the cutting speed, d is the cutting depth, and r is the radius.

4 is a graph showing spindle energy consumption for rpm in a method of evaluating machine tool energy consumption according to an embodiment of the present invention.

Referring to FIG. 4, the spindle energy consumption amount calculated in the spindle energy calculation step S5 tends to increase in proportion to the material supply amount. That is, it can be seen that the power consumed by the rpm of the roller for supplying the material in three different machine tools 10 shown in different colors of brown, green and blue is proportional.

Therefore, in the main axis energy calculating step S5, the main axis energy (E_ main axis ) can be functionized as follows.

[Equation 6]

E_ main axis = (c_ main axis * rpm) * t [W]

Here, the c_post axis is a constant according to the characteristics of the machine tool 10, and rpm is the number of revolutions per minute of the material supply roller. For example, the value of the c- major axis may be 0.5276 for the machine tool 10 shown in brown in the graph of FIG.

FIG. 5A is a graph showing energy consumption of the transfer axis for x-axis supply in the method of evaluating machine tool energy consumption according to the embodiment of the present invention. FIG. FIG. 5B is a graph showing the energy consumption of the transport axis for the z-axis feed in the method of evaluating machine tool energy consumption according to the embodiment of the present invention.

Referring to FIGS. 5A and 5B, the transfer axis energy calculating step S6 is a step of calculating an energy consumption amount according to the feeding during material supply. FIG. 5A shows the power when transporting along the positive and negative directions of the x-axis, and FIG. 5B shows the power when transporting along the positive and negative directions of the z-axis.

In the case of the x-axis in Fig. 5A, the consumption amount of energy is different depending on the direction, because the energy consumption is different when transporting in the direction opposite to that in the gravity direction. In the case of Fig. 5B, It can be seen that similar power is consumed without any power.

Accordingly, + x axis feed during energy (E_ + x-axis delivery), -x axis feed during energy (E_ -x-axis delivery), z-axis during the transfer of energy (E_ z-axis delivery), and the total energy feed shaft (feed shaft E_ ) Can be expressed as a graph of a linear function according to the feed amount FEED.

[Equation 7]

E_ + x axis feed = (C1_ + x axis feed * FEED + C2_ + x axis feed ) * t [W]

[Equation 8]

E_ -x axis feed = (C1_- x axis feed * FEED + C2_ -x axis feed ) * t [W]

[Equation 9]

E_z axis feed = (C1_z axis feed * FEED + C2_z axis feed ) * t [W]

[Equation 10]

E_Transport axis = E_ + X axis feed + E_- x axis feed + E_z axis feed [W]

Here, the C1_ + x axis feed , C2_ + x axis feed , C1_- x axis feed , C2_- x axis feed , C1_z axis feed , and C2_z axis feed are constants determined according to the characteristics of the machine tool 10 , For example 0.0321, 19.032, -0.0398, 5.8321, 0.024, -5.606, respectively.

The processing energy (E_ processing), the main shaft energy (E_ major axis) and the feed shaft energy (E_ transverse axis) can be changed by the value of the variables other than time. Therefore, the energies can be defined as variable energies.

Referring to Figure 2, made of a step of calculating a total consumed energy (E_ total) by summing all of the energy mentioned above in the final total energy consumption calculation step (S7).

[Fig. 10]

E_ total = Constant energy + variable energy

= (E_ chip conveyor + E_ coolant pump + E_ atmospheric energy ) + (E_ machining + E_ spindle + E_transport axis )

And, accordingly, the total consumption of energy (E_ total) for machine tools (10) is able to be calculated.

It is to be understood that the present invention is not limited to the above-described embodiment, and that various modifications, additions and substitutions are possible, without departing from the scope of the present invention as defined in the appended claims. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

100; An energy consumption evaluation system 110; Measuring instrument
120; A control unit 10; machine tool

Claims (10)

A method for evaluating energy consumed in a machine tool,
Calculating a constant energy having a constant value over time;
Calculating a variable energy whose value is changed by a variable other than the time; And
And calculating total energy consumption by summing the constant energy and the variable energy. The method according to claim 1,
The step of calculating the constant energy
Calculating energy consumed in the chip conveyor;
Calculating energy consumed by the coolant pump; And
And calculating the energy consumed in the atmosphere. 3. The method of claim 2,
Wherein the energy consumed in the chip conveyor is determined according to the following equation:
[Equation 1]
(E_chip conveyor = c_chip conveyor * t [WH] where c_chip conveyor is a constant according to the characteristics of the machine tool, and t is time. 3. The method of claim 2,
Wherein the energy consumed by the coolant pump is determined according to the following equation.
[Equation 2]
E_ coolant pump = c_ coolant pump * t [WH] (wherein, c_ coolant pump is a constant, t is the time according to the characteristics of the machine tool). 3. The method of claim 2,
Wherein the energy consumed in the atmosphere is determined according to the following equation.
[Equation 3]
E_ air energy = energy c_ air * t [WH] (wherein, c_ air energy is constant in accordance with the characteristics of the machine tool, t is the time) The method according to claim 1,
The step of calculating the variable energy
Calculating energy consumed in processing;
Calculating energy consumed in the main shaft; And
And calculating energy consumed in the transfer axis. The method according to claim 6,
Wherein the energy consumed in the machining is determined according to the following equation.
[Equation 4]
= E_ processing (processing C1_ * MRR + C2_ processing) * t [W] (wherein, C1_ processing and C2_ processing is constant in accordance with the characteristics of the machine tool) The method according to claim 6,
Wherein the energy consumed in the spindle is determined according to the following equation:
[Equation 5]
E_main axis = (c_main axis * rpm) * t [W] (where c_main axis is a constant according to the characteristics of the machine tool, rpm is the number of revolutions per minute of the material supply roller). The method according to claim 6,
Wherein the energy consumed in the transfer axis is determined according to the following equation.
[Equation 6]
E_transport axis = E_ + x axis feed + E_- x axis feed + E_z axis feed [W] where E_ + x axis feed , E_- x axis feed , E_z axis feed are + x axis, -x Axis and z-axis). 10. The method of claim 9,
Wherein the energy consumed during transportation in the + x axis, the -x axis, and the z axis is determined according to the following equation.
[Equation 7]
E_ + x axis feed = (C1_ + x axis feed * FEED + C2_ + x axis feed ) * t [W]
[Equation 8]
E_ -x axis feed = (C1_- x axis feed * FEED + C2_ -x axis feed ) * t [W]
[Equation 9]
E_z axis feed = (C1_z axis feed * FEED + C2_z axis feed ) * t [W] where C1_ + x axis feed , C2_ + x axis feed , C1_x axis feed , C2_x axis feed , C1_z axis feed and C2_z axis feed are constants that are determined by the characteristics of the machine tool, respectively).
KR1020140193839A 2014-12-30 2014-12-30 Energy Consumtion Evaluation Method For CNC KR20160080978A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112571151A (en) * 2020-10-21 2021-03-30 重庆工程职业技术学院 Device for measuring additional load loss coefficient of milling machine without cutting
KR20210067472A (en) * 2019-11-29 2021-06-08 한국생산기술연구원 Energy analysis method for machine tools and energy analysis system
KR20220072792A (en) * 2020-11-25 2022-06-02 연세대학교 산학협력단 Numerical control device and method for estimating energy consumption of machine tool at component level

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210067472A (en) * 2019-11-29 2021-06-08 한국생산기술연구원 Energy analysis method for machine tools and energy analysis system
CN112571151A (en) * 2020-10-21 2021-03-30 重庆工程职业技术学院 Device for measuring additional load loss coefficient of milling machine without cutting
CN112571151B (en) * 2020-10-21 2022-01-28 重庆工程职业技术学院 Device for measuring additional load loss coefficient of milling machine without cutting
KR20220072792A (en) * 2020-11-25 2022-06-02 연세대학교 산학협력단 Numerical control device and method for estimating energy consumption of machine tool at component level

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