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KR20140087807A - System and method supplying cutting oil - Google Patents

System and method supplying cutting oil Download PDF

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Publication number
KR20140087807A
KR20140087807A KR1020120158482A KR20120158482A KR20140087807A KR 20140087807 A KR20140087807 A KR 20140087807A KR 1020120158482 A KR1020120158482 A KR 1020120158482A KR 20120158482 A KR20120158482 A KR 20120158482A KR 20140087807 A KR20140087807 A KR 20140087807A
Authority
KR
South Korea
Prior art keywords
pressure
coolant
cutting oil
coolant supply
supply pump
Prior art date
Application number
KR1020120158482A
Other languages
Korean (ko)
Inventor
홍순기
이종만
장현중
Original Assignee
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR1020120158482A priority Critical patent/KR20140087807A/en
Publication of KR20140087807A publication Critical patent/KR20140087807A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3006—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being actuated by the pressure of the fluid to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING 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 METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/10—Arrangements for cooling or lubricating tools or work
    • B23Q11/1038—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality
    • B23Q11/1046—Arrangements for cooling or lubricating tools or work using cutting liquids with special characteristics, e.g. flow rate, quality using a minimal quantity of lubricant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING 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 METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/14—Methods or arrangements for maintaining a constant temperature in parts of machine tools
    • B23Q11/145—Methods or arrangements for maintaining a constant temperature in parts of machine tools using a jet of gas or cutting liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING 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 METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
    • B23Q15/007—Automatic control or regulation of feed movement, cutting velocity or position of tool or work while the tool acts upon the workpiece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
    • F15B7/04—In which the ratio between pump stroke and motor stroke varies with the resistance against the motor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Auxiliary Devices For Machine Tools (AREA)

Abstract

The present invention relates to an apparatus and a method for supplying cutting oil for a machine tool and, more specifically, to an apparatus and a method for supplying cutting oil, which can consistently maintain the pressure of cutting oil supplied to the inside of a machine tool, according to the number of operating cutting tools, in order to save electric power and to provide high efficiency operation. The apparatus for supplying cutting oil for a machine tool for saving energy comprises: a cutting oil supply pump which pumps and discharges cutting oil in a cutting oil tank; a pressure sensor which measures the cutting oil supply pressure at a discharge path on the cutting oil supply pump; a variable motor which operates the cutting oil supply pump; and an inverter which controls the variable motor according to a measured pressure signal of the pressure sensor in order to variably control the cutting oil discharge pressure discharged from the cutting oil supply pump.

Description

TECHNICAL FIELD [0001] The present invention relates to a cutting apparatus,

The present invention relates to an apparatus and a method for supplying cutting oil for a machine tool, and more particularly, to a cutting apparatus for supplying cutting oil to a cutting tool, Apparatus and method.

In general, frictional heat generated when cutting a workpiece using a machine tool has a negative effect on the durability of the cutting tool and the accuracy of the workpiece to be cut. In order to prevent this, the machine tool is provided with a coolant supply device. The coolant supply device supplies the coolant to the portion where the frictional heat is generated by progressing the cutting process, cooling and lubricating the cutting tool and the workpiece, And clean the finish surface of the workpiece.

These machine tools are composed of various components. Among them, the power consumption of the coolant supply pump for supplying the coolant oil accounts for the largest portion of the power consumption of the machine tool.

1 is a schematic diagram showing a conventional coolant supply device.

1, a conventional coolant supply device includes a coolant tank 10 for storing coolant, a coolant supply pump 20 for pumping coolant from the coolant tank 10, And a relief valve 40 for draining a cutting oil having a pressure higher than a required pressure.

Such a conventional coolant supply device is operated by using a fixed-rotation type coolant supply pump 20. However, since the coolant supply is continuously supplied regardless of whether the MCC (MOTOR CONTROL CENTER) is operated or not, there is a problem that excessive power consumption is caused have.

Further, the conventional coolant supply apparatus forms more than necessary cutting oil pressure by continuous operation. At this time, since the cutting oil having the rated discharge pressure or higher can not be used, the cutting oil exceeding the required amount is drained through the relief valve, The rotation rate of the cutting oil is increased, and further, the continuous operation lowers the service life and causes a trouble bundle.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described above, and it is an object of the present invention to provide a cutting tool, which detects a pressure of cutting oil supplied to a cutting tool of a machine tool by a pressure sensor, And an object of the present invention is to provide an energy saving type coolant supply apparatus and method for variable control of a pump.

According to an aspect of the present invention, there is provided a cutting apparatus including: a coolant supply pump for pumping and discharging coolant from a coolant tank; A pressure sensor for measuring a coolant supply pressure in a discharge path of the coolant supply pump; A variable motor for operating the coolant supply pump; And an inverter for controlling the variable motor in accordance with the measured pressure signal of the pressure sensor to variably control the discharge pressure of the coolant discharged from the coolant supply pump.

In the embodiment of the present invention, the automatic operation valves connected to each other in parallel are connected to the discharge path of the coolant supply pump, and each automatic operation valve is connected to each machining spindle of the MCC to supply a predetermined pressure of the coolant.

The present invention also provides a process for detecting a coolant supply pressure formed in a discharge path of a coolant supply pump to form a measured pressure signal; Calculating a pressure deviation by comparing the measured pressure signal with a set pressure signal, and variably controlling a rotating operation of the variable motor using the pressure deviation; Wherein the controller controls the supply of the coolant supply pressure to the MCC through the process of forming the coolant discharge pressure of the coolant supply pump by the rotation operation of the variable motor.

At this time, the coolant supply pressure supplied to the MCC is controlled by a proportional integral control method in accordance with the number of movable spindles.

The apparatus and method for supplying coolant according to the present invention have the following advantages.

1. Variable operation using proportional integral control method maintains proper cutting oil supply pressure to prevent unnecessary power loss, thereby enabling power saving and high efficiency operation, thereby reducing production cost.

2. It is possible to omit the existing relief valve for draining more coolant than necessary, thereby minimizing the occurrence of frictional heat and suppressing the rise of the cutting oil temperature, as well as reducing the cutting oil rotation rate and operating noise, can do.

3. It is possible to extend the service life of machine tools related to cutting oil such as coolant supply pump and variable motor, and the maintenance cost is reduced.

1 is a schematic diagram showing a conventional coolant supply device
2 is a schematic diagram showing a coolant supply device of the present invention
3 is a graph showing test results of the coolant supply device according to the present invention
4 is a graph showing a cutting oil supply pressure according to the number of movable spindles of an MCC connected to a coolant supply device according to the present invention.

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.

The present invention relates to an energy saving type coolant supply apparatus that prevents unnecessary power loss by optimally operating a tool according to the conditions required by the machine tool, thereby enabling high efficiency operation. The present invention relates to an energy saving type coolant supply apparatus, Spindle) is maintained at an appropriate pressure to keep the power consumption at a minimum, thereby achieving high-efficiency operation. In addition, by eliminating the conventional relief valve, the occurrence of frictional heat is minimized to reduce the rotation rate of the coolant.

FIG. 2 is a schematic configuration diagram showing a coolant supply device according to the present invention.

2, the coolant supply device of the present invention includes a coolant tank 1 for storing coolant, a coolant supply pump 2 for pumping coolant from the coolant tank 1, A pressure sensor 5 for measuring the coolant supply pressure at the discharge path (or output end) 4 of the supply pump 2 and a pressure sensor 5 for measuring the pressure of the coolant supplied to the pressure sensor 5 And an inverter (6) for controlling the drive of the variable motor (3).

The coolant supply pump 2 is a variable pump or an inverter pump driven by an inverter attaching type motor. The coolant supply pump 2 operates according to the number of revolutions of a variable motor controlled according to a signal received from the inverter 6, and discharges coolant.

The variable motor 3 is an inverter type motor and is connected to a coolant supply pump 2 to drive the supply pump 3 and is rotationally driven in accordance with a control signal of the inverter 6 to generate power.

The pressure sensor 5 is connected to the discharge path 4 of the coolant supply pump 2 and measures the discharge path pressure of the supply pump 2, that is, the coolant supply pressure, .

In other words, the pressure sensor 5 is connected to the discharge path 4 of the coolant supply pump 2 and the pressure gauge 7 provided in the discharge path 4 to measure the pressure of the coolant supplied to the MCC.

For example, as the pressure sensor 5, a process type of manometer may be used. As is known, the process-type manometer detects a coolant supply pressure formed in the discharge path 4 of the coolant supply pump 2, and at the same time, has a switching function capable of changing the switching state when the set limit value is exceeded or exceeded Can be implemented.

The inverter 6 controls the operation of the variable motor 3 in accordance with the measured pressure signal received by the pressure sensor 5 and controls the operation of the variable-motor 3 based on the coolant supply pressure (the coolant supply pump and the MCC The control of the turning operation of the variable motor 3 in accordance with the related signal is performed to adjust the power supplied to the coolant supply pump 2, And controls the coolant supply pressure formed in the discharge path 4 of the coolant supply pump 2 (or the coolant pipe connected between the coolant supply pump and the MCC).

In other words, the inverter 6 at this time is a controller for controlling the variable motor 3 in proportional integral (PI) control or synchronous control mode in accordance with the number of movable spindles of the MCC, And the pressure difference is calculated by comparing this signal (measured pressure signal) with the set pressure signal, and using this pressure deviation, The rotation of the variable motor is controlled by calculating the coolant discharge pressure of the supply pump so that the coolant discharge pressure is formed in accordance with the pressure deviation to be formed in the discharge passage 4 of the coolant supply pump 2, It is possible to control the cutting oil supply pressure to be constant at a predetermined pressure.

That is, the inverter 6 compares the measured pressure signal detected by the pressure sensor 5 with the set pressure signal, and supplies a feedback signal corresponding to the pressure deviation to the variable motor 3 to change the coolant supply pump 2 to a variable So that the coolant supply pressure to be supplied to the MCC is controlled to be kept constant according to the number of movable spindles.

2, a check valve 8 for preventing backflow and automatic operation valves 9 connected in parallel to each other are provided in the discharge path 4 of the coolant supply pump 2.

The check valve 8 is installed in the coolant pipe between the coolant supply pump 2 and the automatic operation valve 9, that is, the discharge passage 4.

Each of the automatic operation valves 9 is automatically controlled to open and close the valve so as to maintain the pressure at the valve outlet at a predetermined pressure. The automatic operation valve 9 is connected to each machining spindle (or cutting tool) So that the machining spindle can supply the machining spindle with the machining spindle.

For example, a solenoid valve may be used as the automatic operation valve 9.

As described above, the coolant supply device of the present invention is provided with the pressure sensor 5 connected to the discharge passage 4 of the coolant supply pump 2 and the pressure sensor 5 using the signal of the pressure sensor 5, The supply pressure of the coolant of the supply pump 2 is variably controlled so that the coolant supply pressure supplied to the MCC is constantly controlled in accordance with the number of movements of the movable spindle.

The coolant supply device controls the coolant supply pressure and the supply flow rate in synchronism with each other according to the number of machining spindles operated by the MCC, so that power can be saved by controlling only the appropriate pressure necessary for operation of each machining spindle. Since the variable operation is performed so as to supply only the required cutting oil pressure, it is possible to minimize the frictional heat generated at the time of machining, thereby reducing the rotation rate of the cutting oil.

Such a coolant supply device is formed by optimizing the discharge pressure of the coolant supply pump by using a variable rotation type inverter pump that uses a pressure signal from a pressure sensor, so that cutting oil having a rated discharge pressure or higher can be used.

3 is a graph showing test results of a coolant supply device according to the present invention.

As a result of the test using the test tool using a predetermined program, the automatic operation valve connected to each machining spindle of the MCC is sequentially opened and the coolant pressure supplied to each machining spindle of the MCC It was confirmed that the value (pressure measurement value) was maintained almost equal to the set pressure value (pressure setting value).

In addition, FIG. 4 shows the cutting oil supply pressure according to the number of movable spindles of the MCC connected to the coolant supply device according to the present invention. As shown in FIG. 4, even when the number of operating spindles is increased, It can be seen that the pressure is kept constant.

As described above, according to the present invention, the coolant supply pressure to be supplied to the MCC side is formed and kept constant as required according to the number of the operating spindles to be operated, thereby enabling the optimum high-efficiency operation.

1: Coolant tank
2: Coolant supply pump
3: Variable motor
4: Coolant supply pump Discharge line (or coolant piping)
5: Pressure sensor
6: Inverter
9: Automatic operation valve

Claims (5)

A coolant supply pump for pumping and discharging coolant from the coolant tank;
A pressure sensor for measuring a coolant supply pressure in a discharge path of the coolant supply pump;
A variable motor for operating the coolant supply pump;
An inverter for controlling the variable motor to vary the coolant discharge pressure discharged from the coolant supply pump according to a measured pressure signal of the pressure sensor;
And an energy-saving coolant supply device.
The method according to claim 1,
Wherein an automatic operation valve connected to each other in parallel is connected to the discharge path of the coolant supply pump and each automatic operation valve is connected to each machining spindle of the MCC to supply a cutting oil of a predetermined pressure. Device.
The method according to claim 1 or 2,
And a check valve for preventing backflow is installed in the discharge path of the coolant supply pump.
Detecting a coolant supply pressure formed in a discharge path of the coolant supply pump to form a measured pressure signal;
Calculating a pressure deviation by comparing the measured pressure signal with a set pressure signal, and variably controlling a rotating operation of the variable motor using the pressure deviation;
A process of forming a coolant discharge pressure of the coolant supply pump by the rotation operation of the variable motor;
Wherein the supply of the coolant to the MCC is controlled so as to be maintained constant.
The method of claim 4,
Wherein the cutting oil supply pressure supplied to the MCC is controlled in a proportional integral control manner according to the number of movable spindles.
KR1020120158482A 2012-12-31 2012-12-31 System and method supplying cutting oil KR20140087807A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120158482A KR20140087807A (en) 2012-12-31 2012-12-31 System and method supplying cutting oil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120158482A KR20140087807A (en) 2012-12-31 2012-12-31 System and method supplying cutting oil

Publications (1)

Publication Number Publication Date
KR20140087807A true KR20140087807A (en) 2014-07-09

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KR1020120158482A KR20140087807A (en) 2012-12-31 2012-12-31 System and method supplying cutting oil

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160138628A (en) 2015-05-26 2016-12-06 정유철 Pump Apparatus Having Pressure Switch, And Driving Method For Pump Apparatus
CN110539199A (en) * 2019-08-07 2019-12-06 太仓志霖液压机械有限公司 Servo-driven spray pressure adjusting device with pressure sensor for hydraulic pump station
KR20210129408A (en) 2020-04-20 2021-10-28 두산공작기계 주식회사 Coolant supply device for machine tools

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160138628A (en) 2015-05-26 2016-12-06 정유철 Pump Apparatus Having Pressure Switch, And Driving Method For Pump Apparatus
CN110539199A (en) * 2019-08-07 2019-12-06 太仓志霖液压机械有限公司 Servo-driven spray pressure adjusting device with pressure sensor for hydraulic pump station
KR20210129408A (en) 2020-04-20 2021-10-28 두산공작기계 주식회사 Coolant supply device for machine tools

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E902 Notification of reason for refusal
E601 Decision to refuse application