KR20210123514A - Coolant supply improving device of machine tool - Google Patents

Abstract

The present invention relates to an apparatus for improving coolant supply for a machine tool. According to the present invention, the apparatus for improving coolant supply for a machine tool comprises: a spindle for rotating a tool or workpiece; a coolant supply unit for supplying coolant to the tip of the spindle; and an air supply unit for supplying air to the coolant supply unit. When the operation of the coolant supply unit is stopped and the coolant supply to the spindle from the coolant supply unit is stopped, the air supply unit operates to discharge the coolant remaining in the coolant supply unit.

Description

Coolant supply improving device of machine tool

The present invention relates to an apparatus for improving the coolant supply of a machine tool, and more particularly, prevents the coolant from flowing down due to its own weight when the coolant supply to the processing part of the workpiece is stopped and, at the same time, by supplying air The present invention relates to an apparatus for improving the coolant supply of a machine tool, which can improve the productivity of the machine tool by rapidly discharging the coolant remaining in the coolant supply line using pneumatic pressure.

In general, a machine tool refers to a machine used for the purpose of processing a metal/non-metal workpiece into a desired shape and size using an appropriate tool by various cutting or non-cutting methods.

Various types of machine tools, including turning centers, vertical/horizontal machining centers, door machining centers, Swiss turns, electric discharge machines, horizontal NC boring machines, and CNC lathes, are widely used in various industrial sites for their respective purposes.

In general, various types of machine tools currently used have an operation panel to which numerical control (NC) or computerized numerical control (CNC) technology is applied. Such an operation panel is provided with various function switches or buttons and a monitor.

In addition, the machine tool includes a table on which a workpiece material is seated and transferred for processing the workpiece, a pallet for preparing the workpiece before processing, a spindle that rotates when a tool or workpiece is combined, a tailstock for supporting the workpiece, etc. during processing, a vibration isolator etc. are provided.

In general, in a machine tool, a table, a tool rest, a main shaft, a tailstock, a vibration isolator, etc. are provided with a conveying unit which conveys along a conveying axis in order to perform various processing.

In addition, in general, a machine tool uses a plurality of tools for various processing, and a tool magazine or a turret is used as a tool storage place for storing and storing a plurality of tools.

Such a machine tool uses a plurality of tools for various processing, and a tool magazine is used in the form of a tool storage place storing a plurality of tools.

In addition, in general, a machine tool is provided with an automatic tool changer (ATC, Automatic Tool Changer) for withdrawing a specific tool from the tool magazine or receiving it again according to the command of the numerical control unit in order to improve the productivity of the machine tool.

In addition, in general, a machine tool is provided with an automatic pallet changer (APC, Automatic Palette Changer) in order to minimize the non-working time. The automatic pallet changer (APC) automatically exchanges pallets between the workpiece machining area and the workpiece installation area. Pallets may be loaded with workpieces.

In general, a machine tool supplies a liquid such as a coolant to a spindle or a tool and a workpiece in order to increase the cutting effect and lubricate and cool it, and the coolant is recovered and circulated after use. Chips generated during cutting are mixed with the recovered coolant and recovered. After separating the coolant from the chips using a purification device, the coolant is circulated again.

In particular, the main shaft (spindle) of the machine tool is supplied with a flood coolant to reduce friction between the tool and the workpiece during cutting, cool the tool and the workpiece, and facilitate chip evacuation. That is, the processing precision is improved by spraying the fluid coolant on the processing part when processing the workpiece, cooling is promoted, and chip discharging is facilitated.

In general, the coolant supply device of a machine tool stops the coolant supply when processing is interrupted as necessary, such as a workpiece replacement or a tool replacement.

However, the coolant supply device of the conventional machine tool has a problem in that even when coolant supply is stopped, the residual amount of coolant remaining in the coolant pipe continues to flow down by its own weight, causing inconvenience to the operator.

In addition, in the coolant supply device of the conventional machine tool, even when the coolant supply is stopped, the remaining coolant in the coolant pipe continues to flow down by its own weight until the remaining coolant stops flowing down. There was a problem in that the non-working time increases as the operator waits, and the productivity of the machine tool decreases as the non-working time increases.

Moreover, the coolant supply device of the conventional machine tool is safe as the remaining coolant continues to flow down by its own weight and the processing area becomes dirty, resulting in poor hygiene and dangerous working environment due to the coolant. There was a problem with the increase in accidents.

In addition, the coolant supply device of the conventional machine tool has a problem in that the stability and reliability of the machine tool are reduced as the coolant continues to flow down by its own weight, resulting in user dissatisfaction.

Korean Patent Publication No. 10-2015-0074456 Korean Patent Laid-Open Publication No. 10-2008-0032737 Korean Patent Publication No. 10-2011-0062202

SUMMARY OF THE INVENTION The present invention is to solve the above problems, and an object of the present invention is to reduce the coolant to its own weight by the coolant control valve when the coolant control valve is closed and the coolant sprayed to the workpiece is stopped. At the same time, by opening the air control valve and supplying air to the coolant supply line, the coolant remaining in the coolant supply line between the coolant control valve and the coolant outlet is quickly removed using pneumatic pressure. to improve the productivity of machine tools by reducing non-working time, promote operator convenience, prevent safety accidents in advance by keeping the surrounding environment clean, and improve the stability and reliability of machine tools. An object of the present invention is to provide an apparatus for improving coolant supply for machine tools.

In order to achieve the object of the present invention, an apparatus for improving coolant supply of a machine tool according to the present invention includes: a spindle for rotating a tool or a workpiece; a coolant supply unit supplying coolant to the tip of the spindle; and an air supply unit for supplying air to the coolant supply unit, wherein the air is supplied when the operation of the coolant supply unit is stopped and the coolant supply from the coolant supply unit to the spindle is always stopped. As the unit operates, the coolant remaining in the coolant supply unit may be discharged.

Further, in another preferred embodiment of the apparatus for improving the coolant supply of a machine tool according to the present invention, the coolant supply unit of the apparatus for improving the coolant supply of a machine tool has one end connected to a coolant supply source, and the other end is coolant discharge a coolant supply line connected to the unit; and a coolant control valve installed on the coolant supply line to control the coolant supplied from the coolant supply source to the coolant discharge unit.

In addition, in another preferred embodiment of the apparatus for improving the coolant supply of a machine tool according to the present invention, the air supply unit of the apparatus for improving the coolant supply of a machine tool has one end connected to the air supply and the other end is connected to the air outlet an air supply line having an intersecting portion partially communicating with the coolant supply line; and an air control valve installed on the air supply line to control the air supplied from the air source to the air outlet.

Further, in another preferred embodiment of the apparatus for improving the coolant supply of a machine tool according to the present invention, the cross section of the apparatus for improving the coolant supply of a machine tool is the air supply line between the air control valve and the air outlet. The coolant supply line between the coolant control valve and the coolant discharge unit may cross and communicate with each other.

In addition, in another preferred embodiment of the apparatus for improving the coolant supply of a machine tool according to the present invention, the apparatus for improving the coolant supply of the machine tool may include the air control valve when the coolant control valve is closed and the coolant supply is stopped. may be opened to forcibly discharge the coolant remaining in the coolant supply line between the coolant control valve and the coolant discharge unit by pneumatic pressure.

Further, in another preferred embodiment of the apparatus for improving the coolant supply of a machine tool according to the present invention, the air supply unit of the apparatus for improving the coolant supply of a machine tool is disposed between the air supply source and the air control valve on the air supply line. It may further include; an air direction switching valve installed to change the direction of the air supplied from the air supply source.

Further, in another preferred embodiment of the apparatus for improving the coolant supply of a machine tool according to the present invention, the apparatus for improving the coolant supply of the machine tool includes a control unit for controlling the operation of the coolant control valve and the air control valve; can do.

The coolant supply improvement device for a machine tool according to the present invention prevents coolant from flowing down due to its own weight by the coolant control valve when the coolant control valve is closed and the coolant spraying to the workpiece is stopped At the same time, the air control valve is opened to supply air to the coolant supply line, and the coolant remaining in the coolant supply line between the coolant control valve and the coolant outlet is quickly discharged using pneumatic pressure to replace the workpiece. It has the effect of maximizing the productivity of the machine tool and reducing the processing cost by minimizing the non-working time.

In addition, the apparatus for improving the coolant supply of a machine tool according to the present invention automatically prevents the coolant remaining in the coolant supply line from flowing down and quickly discharges the coolant, thereby improving the convenience of the operator.

Furthermore, the apparatus for improving the coolant supply of a machine tool according to the present invention has the effect of improving worker satisfaction and preventing safety accidents in advance by simply and continuously maintaining the cleanliness of the processing area.

In addition, the apparatus for improving the coolant supply of a machine tool according to the present invention prevents the coolant from flowing down by its own weight stably through a simple operation, and improves the stability and reliability of the machine tool by discharging it quickly, and manufacturing cost has the effect of reducing

1 shows a conceptual diagram of an apparatus for improving coolant supply of a machine tool according to the present invention.
2 shows a circuit diagram of an apparatus for improving coolant supply of a machine tool according to the present invention.

Hereinafter, with reference to the drawings of the coolant supply improvement apparatus of the machine tool according to an embodiment of the present invention will be described in detail. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numbers refer to like elements throughout.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the art to which the present invention pertains It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. The sizes and relative sizes of layers and regions in the drawings may be exaggerated for clarity of description.

The terminology used herein is for the purpose of describing the embodiments, and thus is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprise” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

1 shows a conceptual diagram of an apparatus for improving coolant supply for a machine tool according to the present invention, and FIG. 2 shows a circuit diagram of an apparatus for improving coolant supply for a machine tool according to the present invention.

Definitions of terms used below are as follows. "Horizontal direction" means the horizontal direction in the same member, that is, the X-axis direction that is the left and right direction in FIG. It means an axial direction, and "height direction" means a vertical direction in the same member while perpendicular to the horizontal direction and the vertical direction, that is, the Z-axis direction, which is the vertical direction in FIG. 1 . In addition, upper (upper) means an upward direction in "height direction", that is, a direction upward in FIG. 1, and downward (lower) means a downward direction in "height direction", that is, a downward direction in FIG. 1 do. "One side (one end)" means any one end of the same member in a horizontal direction, a vertical direction, or a height direction, and "the other side (other end)" means a portion opposite to "one side (one end)" in the same member, that is, It means the other end of the horizontal direction, vertical direction, or height direction in the same member.

A coolant improving apparatus 1 of a machine tool according to the present invention will be described with reference to FIGS. 1 and 2 . 1 and 2 , the coolant improving apparatus 1 of a machine tool according to the present invention includes a spindle 10 , a coolant supply unit 20 , and an air supply unit 30 .

The spindle 10 clamps the tool or workpiece to the tip of the spindle through a device such as a chuck or collet and rotates the tool or workpiece. Also, as shown in FIG. 1 , the spindle 10 is installed in the spindle housing 11 . The spindle housing 11 surrounds the outside of the spindle to protect the spindle. Although not shown in the drawing, a servomotor is installed on one side of the spindle and rotates by the servomotor. Although not necessarily limited thereto, according to a preferred embodiment of the present invention, the spindle 10 is installed vertically.

The coolant supply unit 20 supplies the coolant to the tip of the spindle 10 . That is, the coolant supply unit 20 supplies the coolant to the workpiece or tool that is detachably mounted on the tip of the spindle 10 during processing of the workpiece.

The air supply unit 30 supplies air to the coolant supply unit 20 . In addition, although not shown in the drawings, the air supply unit 300 supplies air to the tip of the spindle as necessary to form an air curtain to prevent chips from flowing into the spindle, and to keep the surface of the workpiece as clean as possible during processing. can be maintained to improve processing precision.

When the coolant supply unit stops supplying the coolant from the coolant supply unit to the spindle, the air supply unit operates to discharge the coolant remaining in the coolant supply unit. That is, when the coolant supply is not required because the workpiece processing is stopped, such as a workpiece or tool replacement, or an emergency situation, the coolant supply unit stops, and accordingly, the coolant supply from the coolant supply unit to the spindle is stopped. . At the same time as the coolant supply unit is stopped, the air supply unit operates, and the residual amount of coolant remaining in the coolant supply unit is rapidly discharged to the outside of the coolant supply unit by pneumatic pressure through the air supply.

In this way, the coolant supply improving device for a machine tool according to the present invention automatically stops the coolant supply unit when the coolant supply unit is stopped because the processing of the workpiece does not proceed and the coolant supply to the workpiece processing part is stopped. to quickly discharge the remaining amount of coolant in the coolant supply unit using pneumatic pressure through air supply by operating Maximize productivity and reduce processing costs.

1 and 2, the coolant improving apparatus 1 of the machine tool according to the present invention may further include a control unit 40 and/or a manifold 50.

The control unit 40 controls the operation of the coolant control valve and the air control valve, which will be described later. That is, the control unit 40 transmits a signal to the coolant control valve and the air operation valve when the processing of the workpiece is stopped by a signal such as a workpiece processing program or PLC to close the coolant control valve 24 (close / off), the air control valve 35 is opened/on to supply air through the intersection of the coolant supply line, and the coolant remaining in the coolant supply line is rapidly discharged by pneumatic pressure. In addition, the control unit 40 transmits a signal to the coolant control valve and the air operation valve when the processing of the workpiece is in progress to open/on the coolant control valve 24 , and the air control valve 35 . to supply the coolant to the tip of the spindle from the coolant supply source and block the air supplied from the air supply source from flowing into the coolant supply line.

In addition, although not shown in the drawings, the coolant supply improvement device control unit of the machine tool according to the present invention includes a PLC for the workpiece cutting confirmation device.

The control unit includes NC (numerical control, NC) or CNC (computerized numerical control), and various numerical control programs are built-in. That is, the control unit includes an air supply source, a coolant supply source, a spindle, an air control valve, a coolant control valve, and a driving program of the air direction switching valve, and the program is automatically loaded and operated according to the operation of the control unit. In addition, the control unit communicates with the PLC and the air supply source, the coolant supply source, the air control valve, the coolant control valve, the air directional valve, and the spindle by a predetermined protocol.

In addition, although not shown in the drawings, according to a preferred embodiment of the present invention, the control unit includes a main operation unit, and the main operation unit includes a screen display program and a data input program according to screen display selection, and the screen display According to the output of the program, the software switch is displayed on the display screen, and the ON/OFF of the software switch is recognized to give input/output commands for machine operation.

In addition, although not necessarily limited thereto, the main operation unit includes a monitor that is installed on the housing, case, or one side of the machine tool to display various function switches or buttons and various information.

PLC (Programmable Logic Controller) communicates with the spindle, air supply source, coolant supply source, air control valve, coolant control valve, air direction control valve, etc. according to a predetermined protocol, and executes control commands through such communication. carry out That is, the PLC drives the spindle, the air supply source, and the coolant supply source according to the numerical control program of the control unit.

Therefore, the coolant supply improvement apparatus for a machine tool according to the present invention automatically controls the operation status and operation sequence of the coolant control valve, the air operation valve, the air directional control valve, the air supply source, and the coolant supply source depending on whether the workpiece is processed or not. As a result, the remaining amount of coolant on the coolant supply line is prevented from flowing down due to its own weight, and the remaining amount of coolant is quickly supplied in the coolant supply line by pneumatic pressure through air supply. By discharging to the outside of the line, it is possible to maximize productivity, promote operator convenience, and improve machine tool reliability by minimizing non-working time due to reduced waiting time for workers.

The manifold 50 is detachably installed outside the spindle housing 11 of the machine tool to bind the coolant supply unit and the air supply unit. Specifically, the manifold 50 is detachably installed on the outside of the spindle housing 11 to form an intersection where the air supply line and the coolant supply line intersect, and the coolant supply line and the air supply line are separated from other equipment. It can be installed reliably to prevent interference or interfering with other equipment.

In this way, the manifold achieves miniaturization and compactness of the machine tool supply improvement device according to the present invention, thereby maximizing the space utilization, reducing the manufacturing cost and installation cost, reducing the maintenance time and cost, and convenience can be achieved.

As shown in FIG. 2 , the coolant supply unit 20 of the apparatus 1 for improving the coolant supply of a machine tool according to the present invention includes a coolant supply line 22 and a coolant control valve 24 .

One end of the coolant supply line 22 is connected to the coolant supply source 21 , and the other end of the coolant supply line 22 is connected to the coolant discharge unit 23 . That is, the coolant supply line 22 is formed in the form of a hollow tube capable of supplying a fluid, such as a hose or a pipe, one end connected to the coolant supply source, and the other end connected to the coolant discharge unit, from the coolant supply source. The supplied coolant is discharged through the coolant outlet, and the coolant is sprayed on the tip of the spindle. Although not necessarily limited thereto, the coolant supply line 22 may be installed to extend in the vertical direction (Z-axis direction in FIG. 1 ) along the outside of the spindle or the spindle housing. Accordingly, the coolant moves downward by its own weight.

Although not necessarily limited thereto, the coolant supply source 21 is generally formed in a hexahedral or cylindrical shape so as to have a sufficient volume to store the coolant in order to supply the coolant to the processing part during processing of the workpiece under the control of the controller. keep the In addition, a circulation pump is installed in the coolant tank to generate power to supply the coolant stored in the coolant tank to the processing part of the workpiece to flow the coolant to the coolant supply line.

In addition, the coolant discharge unit 23 is installed adjacent to the tip of the spindle, and includes a nozzle or the like to spray the coolant with a predetermined pressure. In addition, the coolant discharge unit 23 is branched from the other end of the coolant supply line into a plurality to supply the coolant in various forms to the tip of the spindle in a balanced manner.

The coolant control valve 24 is installed on the coolant supply line 22 to control the supply of coolant supplied from the coolant supply source and discharged to the coolant discharge unit. That is, the coolant control valve controls supply and discharge of coolant by opening (open/on) or closing (close/off) the coolant supply line according to a control signal from the controller. Although not necessarily limited thereto, the coolant control valve may be formed of a solenoid valve or a check valve.

As shown in Figure 2, the air supply unit 30 of the coolant supply improvement apparatus 1 of the machine tool according to the present invention is an air supply line 32 and an air control valve 35, and / or air direction change. a valve 36 .

One end of the air supply line 32 is connected to the air supply 31 , and the other end of the air supply line 32 is connected to the air outlet 33 . In addition, the air supply line 32 has a cross section 34 through which a part of the air supply line intersects and communicates with the coolant supply line 22 . Although not necessarily limited thereto, the air supply line 32 may be installed to extend in the vertical direction (Z-axis direction in FIG. 1 ) along the outside of the spindle or the spindle housing so as to be adjacent to the coolant supply line. In addition, the cross section may be installed to be connected to the manifold. Accordingly, miniaturization and compactness can be achieved, and interference with other components can be minimized.

One end of the coolant supply line 32 is connected to the air supply 31 , and the other end of the air supply line 32 is connected to the air outlet 23 . That is, the air supply line 32 is formed in the form of a hollow tube capable of supplying a fluid such as a hose or a pipe, one end is connected to the air supply source, the other end is connected to the air discharge unit, and the intersection of the air supply line is cool. Part of the air supplied through the air supply line intersecting and communicating with the runt supply line is supplied to the coolant supply line, and the coolant remaining in the coolant supply line is quickly discharged through pneumatic pressure, and the remaining air is discharged through

Although not necessarily limited thereto, the air supply 31 is a pneumatic tank having a predetermined pressure capable of supplying air pressure for discharging the coolant remaining in the coolant supply line when the workpiece processing is stopped according to the control signal of the controller. Or it is formed as a compressor (compressor) to supply air.

In addition, the air discharge unit 33 may be installed adjacent to the tip of the spindle or installed to be spaced apart from the coolant discharge unit, and may include a nozzle or the like to spray air at a predetermined pressure. Accordingly, an air curtain is formed at the tip of the spindle to improve the processing precision of the workpiece, and it is possible to improve productivity by reducing the replacement time of the workpiece or tool.

The air control valve 35 is installed on the air supply line 32 to control the supply of air supplied from the air supply source 31 and discharged through the air discharge unit. That is, the air control valve controls the supply and discharge of air by opening (open/on) or closing (close/off) the air supply line according to the control signal of the control unit. Although not necessarily limited thereto, the air control valve may be formed of a solenoid valve or a check valve.

The air direction switching valve 36 is installed between the air supply source 31 and the air control valve 35 on the air supply line 32 to convert the direction of the air supplied from the air supply source. Although not necessarily limited thereto, the air directional valve may be formed as a solenoid valve.

That is, the pneumatic pressure through the air supplied from the air supply source is branched from the air direction switching valve and supplied to each part of the machine tool. For example, it is supplied to the spindle tool unclamp and the cam port of the automatic tool changing device to raise and lower the draw bar or the cam port when changing the tool. In addition, it can be supplied to a rotating union that allows the pallet to be exchanged automatically, and air pressure is supplied to the collet disposed inside the spindle to prevent foreign substances from entering the collet when the tool is exchanged. As such, the air direction switching valve determines the supply direction of each part through the control signal of the control unit when generating air pressure by supplying air supplied from the air supply source.

Specifically, the air direction switching valve operates by hydraulic pressure or pneumatic pressure to discharge the air generated from the air supply source to the air discharge unit via the air supply line when the coolant supply line is closed by the control signal of the control unit. Through the movement of the spool, the spool of the air directional selector valve moves to change the air supply direction. Then, the air control valve is opened (open/on) by the control signal of the control unit, and the air supplied from the air supply source flows through the air supply line, and some of it flows into the coolant supply line and remains in the coolant supply line. The coolant is discharged, and the remaining air flows to the air discharge unit and is discharged.

As shown in FIG. 2 , the intersection 34 of the air supply line of the air supply unit of the coolant supply improvement apparatus 1 of the machine tool according to the present invention includes an air control valve 35 and an air discharge unit 33 . An air supply line 32 therebetween crosses and communicates with the coolant supply line 22 between the coolant control valve 24 and the coolant discharge unit 23 . That is, the position at which the cross section 34 formed by the air supply line 32 intersecting and communicating with the coolant supply line 22 is formed extends between the air control valve 35 and the air discharge section 33 . The air supply line 32 to be used is formed to cross and communicate with any one of the coolant control valve 24 and the coolant discharge unit 23 on the coolant discharge line 22 .

As such, the air supply line 32 formed to extend between the air control valve 35 and the air discharge unit 33 at the position where the intersection 34 is formed is formed on the coolant discharge line 22 on the coolant control valve ( 24) and the coolant discharge part 23 are formed to cross and communicate with each other, and when the coolant control valve is closed and the coolant supply is stopped, the air control valve is opened, and the coolant control valve and the coolant It is possible to pneumatically discharge the coolant remaining inside the coolant supply line between the discharge parts.

Specifically, the air supply line 32 formed to extend between the air control valve 35 and the air discharge unit 33 at a position where the intersection is formed is necessarily formed on the coolant discharge line 22 on the coolant control valve 24 . As it is formed to cross and communicate between the coolant discharge part 23 and the workpiece or tool replacement, or when the workpiece processing is interrupted, such as in an emergency situation, the coolant supply is not required by the control signal of the controller. The operation of the runt supply stops, and the coolant control valve is closed (closed/off) to stop supplying the coolant to the spindle. At this time, the coolant on the coolant supply line between the coolant supply source and the coolant control valve is automatically blocked from being discharged by its own weight as the coolant control valve is closed. In addition, when the coolant control valve is closed, the air supply is operated by the control signal of the control unit, and the air direction switching valve is operated, so that air generated from the air supply is supplied to the air supply line. Also, at the same time, the air control valve is opened/on by the control signal of the control unit, and air is supplied through the air supply line. A part of the air flowing through the air supply line quickly and forcibly discharges the coolant remaining between the coolant control valve and the coolant discharge unit through the intersection to the coolant discharge unit by pneumatic force. In addition, among the air flowing through the air supply line, the remaining air that is not discharged to the coolant supply line through the intersection is discharged through the air discharge unit.

An operating principle of an apparatus for improving coolant supply of a machine tool according to the present invention will be described with reference to FIGS. 1 and 2 .

When the coolant supply is not required because the workpiece processing is stopped, such as a workpiece or tool replacement, or an emergency situation, the coolant supply stops by the control signal of the control unit and the coolant control valve closes (close/off) The coolant on the coolant supply line between the coolant supply and the coolant control valve is automatically blocked from being discharged by its own weight as the coolant control valve is closed.

In addition, when the coolant control valve is closed, the air supply is operated by the control signal of the control unit, and the air direction switching valve is operated, so that air generated from the air supply is supplied to the air supply line.

At the same time, the air control valve is opened/on by the control signal of the controller, and air is supplied through the air supply line. A part of the air flowing through the air supply line is forced to rapidly discharge the coolant remaining between the coolant control valve and the coolant discharge unit through the intersection by pneumatic force to the coolant discharge unit, and flows through the air supply line The remaining air that is not discharged to the coolant supply line through the cross section is discharged through the air outlet.

Conversely, when it is necessary to supply coolant to the machining area such as the tip of the spindle during machining of the workpiece, the spool position of the air directional selector valve is changed according to the control signal of the control unit, so that air is supplied to another place or it is necessary to supply air. If not, stop the operation of the air supply.

In addition, at the same time, the air control valve is closed (close/off) to automatically block the supply of air from the air supply source to the coolant supply line through the intersection.

In addition, when the air control valve is closed, the coolant supply is operated according to the control signal of the control unit, and at the same time, the coolant control valve is opened/on by the control signal of the control unit, and the coolant is supplied through the coolant supply line. is supplied to the machining area through the coolant outlet.

Therefore, in the coolant supply improvement apparatus for a machine tool according to the present invention, when the coolant control valve is closed and the coolant supply to the processing part is stopped, the coolant does not flow down by its own weight by the coolant control valve At the same time, by opening the air control valve and supplying air to the coolant supply line, the coolant remaining in the coolant supply line between the coolant control valve and the coolant outlet is quickly discharged using pneumatic pressure. It is possible to maximize the productivity of the machine tool by minimizing the non-working time such as replacing the workpiece, reduce the machining cost, and improve the stability and reliability of the machine tool.

In addition, the coolant supply improvement apparatus for a machine tool according to the present invention automatically prevents the coolant remaining in the coolant supply line from flowing down, and quickly discharges it to promote operator convenience and simplify the cleanliness of the processing area. and continuous maintenance to improve worker satisfaction and prevent safety accidents in advance.

In the detailed description of the present invention described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those having ordinary knowledge in the technical field of the present invention described in the claims to be described later It will be understood that various modifications and variations of the present invention can be made without departing from the spirit and scope of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

1: Coolant supply improvement device,
10: spindle, 11: spindle housing,
20: coolant supply unit, 21: coolant supply,
22: coolant supply line, 23: coolant discharge part,
24: coolant control valve, 30: air supply unit,
31: air supply, 32: air supply line,
33: air exhaust, 34: intersection,
35: air control valve, 36: air directional valve,
40: control unit, 50: manifold.

Claims (7)

a spindle for rotating a tool or workpiece;
a coolant supply unit supplying coolant to the tip of the spindle; and
Including; an air supply unit for supplying air to the coolant supply unit;
The air supply unit operates to discharge the coolant remaining in the coolant supply unit when the operation of the coolant supply unit is stopped and the coolant supply to the spindle from the coolant supply unit is stopped. Coolant supply improvement device for machine tools.
According to claim 1,
The coolant supply unit,
a coolant supply line having one end connected to the coolant supply source and the other end connected to the coolant discharge unit; and
and a coolant control valve installed on the coolant supply line to control the coolant supplied from the coolant supply source to the coolant discharge unit.
3. The method of claim 2,
The air supply unit,
an air supply line having one end connected to the air supply source and the other end connected to the air discharge unit, and having a cross section in which a part crosses and communicates with the coolant supply line; and
and an air control valve installed on the air supply line to control the air supplied from the air source to the air outlet.
4. The method of claim 3,
The cross section of the machine tool, characterized in that the air supply line between the air control valve and the air discharge unit crosses the coolant supply line between the coolant control valve and the coolant discharge unit to communicate with each other. Coolant supply improver.
5. The method of claim 4,
When the coolant control valve is closed and the coolant supply is stopped, the air control valve is opened to pneumatically remove the coolant remaining in the coolant supply line between the coolant control valve and the coolant outlet. Coolant supply improvement device for machine tools, characterized in that forcible discharge.
4. The method of claim 3,
The air supply unit,
Coolant supply improvement apparatus of a machine tool, characterized in that it further comprises; installed between the air supply line and the air control valve on the air supply line, the air direction switching valve for switching the direction of the air supplied from the air supply source; .
4. The method of claim 3,
Coolant supply improvement apparatus for a machine tool, characterized in that it further comprises; a control unit for controlling the operation of the coolant control valve and the air control valve.

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