KR20130130489A - Coolant supply device of machine tools for automatic coolant supplement - Google Patents

Abstract

The present invention provides a cutting oil supply apparatus capable of automatic supplementation of cutting oil in machine tools that automatically supplies supplementation of cutting oil evaporated and lost using a dual storage tank and prevents splattering of the cutting oil by forming an air curtain film around the injected cutting oil. According to an appropriate embodiment of the present invention, a cutting oil supply apparatus is provided to supply cutting oil to a cutting tool mounted on a spindle through a cutting oil injection nozzle, and is characterized by comprising; a cutting oil separation barrel to recover supplied cutting oil; and a circulation pump connected to the cutting oil separation barrel; and a cutting oil storage tank connected between the circulation pump and the cutting oil injection nozzle; and a supplementary cutting oil tank positioned in the upper part of the cutting oil storage tank to additionally supply insufficient cutting oil according to an oil level height of the cutting oil storage tank; and an electronic valve to open and close an outlet of the supplementary cutting oil tank; and a controller to control actions of the electronic valve.

Description

Coolant supply device for automatic coolant supplement for machine tools {Coolant supply device of machine tools for automatic coolant supplement}

The present invention relates to a cutting oil supply device for a machine tool, and in particular, to automatically supply cutting oil by using a double storage tank, and to form an air curtain film around the cutting oil to be sprayed to prevent cutting oil. The present invention relates to a coolant supply device capable of automatically refilling coolant in a machine.

Spindles on CNC machine tools rotate at high speeds (above 7,000 RPM per minute), which generates enormous frictional heat on the tool and workpiece. Spray coolant to remove friction heat and smooth cutting. However, a large problem occurs when the cutting debris interrupts the circulation cycle of the cutting oil and fails to supply the cutting oil in time due to evaporation or loss during processing.

If a problem occurs in the coolant supply, a fire of the machine may occur due to overheating of the spindle as well as damage to the tool and the workpiece due to overheating. Therefore, if the cutting oil is insufficient in the cutting oil storage tank due to the circulation problem caused by the loss of cutting oil and cutting debris is required.

In addition, the coolant is generated by the rotational centrifugal force of the tool when the cutting oil contacts the tool, thereby promoting the loss of the cutting oil and natural evaporation.

As a background technology of the present invention, Korean Patent Registration No. 10-1051795 discloses an automatic cutting oil dilution and supply device. It consists of an automatic cutting oil dilution and supply device for automatically mixing cutting oil and water to supply the mixed oil diluted with the cutting oil to the mixed oil storage tank, which is a cutting oil mixing tank for mixing the cutting oil and water at a predetermined ratio. And cutting oil pumping means for pumping cutting oil into the cutting oil mixing tank quantitatively, water supply control means for supplying the water to the cutting oil mixing tank quantitatively, and the mixed oil mixed with the cutting oil and the water in the cutting oil mixing tank When the high water level is reached, the mixed oil supply control means 6 for controlling the supply by air pressure to the mixed oil storage tank, and installed inside the cutting oil mixing tank to detect the cutting oil supply level, the lowest level of the mixed oil, and the full level of the mixed oil, respectively. Characterized in that the sensing means is installed.

However, in the background, there is no alternative to compensate for the evaporation or loss of cutting oil. In addition, there is no suggestion of splashing of coolant when it comes into contact with the tool.

Korean Laid-Open Patent Publication No. 2001-0052402 Korean Laid-Open Patent Publication No. 10-2012-0049489

The present invention automatically supplies replenishment of oil coolant lost and evaporated by using a dual storage tank, and automatically replenishes cutting oil of a machine tool to prevent cutting oil by forming an air curtain film around the injected cutting oil. The object is to provide a possible coolant supply.

According to a preferred embodiment of the present invention,

In the coolant supply device for supplying the coolant to the cutting tool mounted on the spindle through the coolant injection nozzle,

A cutting oil separation passage for recovering the supplied cutting oil;

A circulation pump connected to the cutting oil separator;

A cutting oil storage tank connected between the circulation pump and the cutting oil injection nozzle;

A cutting oil auxiliary tank positioned at an upper portion of the cutting oil storage tank and additionally supplying a cutting oil that is insufficient depending on a height of a surface of the cutting oil storage tank;

An solenoid valve for opening and closing an outlet of the cutting oil auxiliary tank; And

It characterized in that it comprises a controller for controlling the operation of the solenoid valve.

In addition, the controller is connected to the storage tank sensor for detecting the oil level of the cutting oil storage tank to control the opening and closing operation of the solenoid valve.

In addition, if the signal detected by the level auxiliary tank sensor of the cutting oil auxiliary tank is determined to be a supplementary signal, characterized in that the warning speaker is connected to the controller so that an alarm sound is generated.

In addition, the cutting oil auxiliary tank is characterized in that it is made of a transparent synthetic resin material so that it is easy to visually check the remaining amount of the stored cutting oil.

In addition, the cutting oil injection nozzle is composed of a nozzle body having a plurality of air curtain holes around the cutting oil injection hole and the cutting oil injection hole formed in the center, and an air housing having an air chamber in communication with the injection hole is coupled to the nozzle body ;

An air compressor for supplying compressed air to the air chamber;

It further comprises an air valve for controlling the amount of compressed air supplied to the air chamber.

Cutting oil supply device capable of automatically refilling the cutting oil of the machine tool according to the present invention, when the replenishment of the cutting oil is detected in the cutting oil storage tank is automatically refueling of the cutting oil stored in the auxiliary tank to make up the evaporated and lost cutting oil to supplement the tool and the workpiece In addition to preventing damage, overheating of the spindle can be prevented.

In addition, the cutting of the coolant can be prevented by the air curtain film, so that the loss of the coolant can be reduced to a minimum.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.
1 is a conceptual diagram of a cutting oil supply device capable of automatically replenishing cutting oil of a machine tool according to the present invention.
Figure 2 is a cross-sectional view of the cutting oil jet nozzle applied to the present invention.
3 is a side view of FIG. 2;
Figure 4 is a control flow diagram of the coolant supply apparatus capable of automatically replenishing the cutting oil of the machine tool according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

As shown in FIG. 1, a cutting oil supply device for supplying cutting oil to a cutting tool 12 mounted on the spindle 10 through a cutting oil injection nozzle 14 includes a cutting oil separation cylinder 16 for recovering the supplied cutting oil. do. The cutting oil separator 16 is disposed on one side of the transfer table 2 for transferring the work 1. The cutting oil separator 16 is provided with a known scraper, a filtration filter, and the like to separate chips and cutting oil introduced during cutting of the workpiece.

The cutting oil separated from the cutting oil separator 16 is supplied to the cutting oil storage tank 20 through a circulation pump 18 connected to the cutting oil separator 16 via a pipe. The coolant auxiliary tank 22 is connected between the circulation pump 18 and the coolant injection nozzle 14 via a pipe. The coolant storage tank 20 is preferably located above the outlet side of the coolant injection nozzle 14.

The cutting oil auxiliary tank 22 is connected to the cutting oil storage tank 20. Preferably the outlet of the coolant auxiliary tank 22 is located above the oil level in the coolant storage tank 20. The cutting oil storage tank 20 serves to additionally supply the cutting oil that is insufficient due to evaporation or disappearance according to the oil level of the cutting oil storage tank 20 to the cutting oil storage tank 20. The cutting oil auxiliary tank 22 is preferably made of a transparent material so that it is easy to visually check the remaining amount of the stored cutting oil. The cutting oil auxiliary tank 22 is more preferably made of synthetic resin such as acrylic, which is less likely to be damaged.

The solenoid valve 24 which electrically opens and closes is provided in the exit of the cutting oil auxiliary tank 22. As shown in FIG. The solenoid valve 24 is electrically connected to the controller 30 which controls its operation.

The controller 30 is connected to the storage tank sensor 32 for detecting the oil level of the cutting oil storage tank 20 to control the opening and closing operation of the solenoid valve 24. Here, the storage tank sensor 32 may be a known level sensor, a near infrared sensor, a sensor using a float, or the like.

In addition, when the signal detected by the auxiliary tank sensor 23 of the cutting oil auxiliary tank 22 is determined as a supplementary signal, a warning speaker 34 is connected to the controller 30 to generate an alarm sound. At this time, the warning speaker 34 may output a warning message of the voice stored in the memory.

On the other hand, the present invention further includes means for preventing splashing by the air curtain after the cutting oil supplied from the cutting oil injection nozzle 14 contacts the tool.

That is, as shown in FIGS. 2 and 3, the cutting oil injection nozzle 14 has a nozzle body 141 having a plurality of air curtain holes 141b around the cutting oil injection hole 141a and the cutting oil injection hole 141a formed at the center thereof. ), And an air chamber 142 having an air chamber 142a in communication with the injection hole 141a and coupled to the nozzle body 141, and an air compressor for supplying compressed air to the air chamber 142a. 143 is connected, and further comprises an air valve 144 for controlling the amount of compressed air supplied to the air chamber (142a).

The plurality of air curtain holes 141b are disposed at the same radius in the center of the injection hole 141a as shown in FIG. 3. The air curtain hole 141b may be configured in a circular shape but preferably has a long hole shape.

The operation of this embodiment configured as described above will be described with reference to FIG.

First, the cutting oil stored in the cutting oil separation tank 16 is driven into the cutting oil storage tank 20 by the driving S10 of the circulation pump 18. The cutting oil introduced into the cutting oil storage tank 20 is supplied to the injection nozzle 14 by potential energy and sprayed to the cutting tool 12.

As such, the coolant circulates through the coolant separator 16, the circulation pump 18, the coolant storage tank 20, and the injection nozzles 14, thereby causing natural evaporation and loss.

Therefore, the oil level in the cutting oil storage tank 20 is gradually lowered, and the storage tank sensor 32 measures and detects (S11) it. The signal detected by the storage tank sensor 32 is determined by the controller 30 (S12).

When the oil level in the cutting oil storage tank 20 becomes low enough to be replenished, the controller 30 checks the replenishment through the storage tank sensor 32 to open the solenoid valve 24 (S13).

Therefore, the replenishment cutting oil stored in the cutting oil auxiliary tank 22 is supplied to the cutting oil auxiliary tank 22 via the open solenoid valve 24 (S14). When the oil level rises by replenishing the cutting oil required for the cutting oil auxiliary tank 22, the solenoid valve 24 is closed again by the controller 30 through the detection of the storage tank sensor 32.

In this way, it is possible to prevent the overheating of the tool and the damage of the workpiece because the cutting oil required for cutting is evaporated or lost during processing.

On the other hand, when the oil level of the cutting oil auxiliary tank 22 is the lowest, the auxiliary tank sensor 23 detects this and the controller 30 determines the replenishment (S16) to generate an alarm sound through the warning speaker 34 (S17). )do. The alarm sound means that the message "Needs coolant needs to be filled" or various types of "beep" sounds that can be recognized by the operator. Therefore, the operator can immediately stop the machining (S18) and replenish the cutting oil to eliminate it by any chance to prevent the occurrence of mechanical fire.

In addition, the operator can visually check the remaining amount in the coolant auxiliary tank 22 from time to time to replenish the coolant at any time, thereby preventing damage to the tool and the workpiece.

On the other hand, in the cutting oil injection nozzle 14, the cutting oil is injected to the tool side through the cutting oil injection hole (141a). At this time, the air compressed by the air compressor 143 is injected at a high pressure through the plurality of air curtain holes (141b) via the air valve 144. At this time, the air injected into the air curtain hole (141b) is wrapped around the cutting oil and injected to form a long cylindrical air curtain film. Therefore, the cutting oil collided on the tool side is captured by the air curtain film that has passed through the air curtain hole 141b, thereby reducing the crushing phenomenon. Therefore, the loss of coolant can be reduced as much as splash prevention.

On the other hand, when the machining program ends (S19), the circulation pump 18 is stopped (S20) and the cutting operation is finished.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

10: spindle
14: coolant spray nozzle
16: coolant separator
18: circulation pump
20: coolant storage tank
22: coolant auxiliary tank
23: auxiliary tank sensor
24: solenoid valve
30: Controller
32: storage tank sensor
34: Warning Speaker

Claims (5)

In the cutting oil supply device for supplying the cutting oil to the cutting tool 12 mounted on the spindle 10 through the cutting oil injection nozzle 14,
A cutting oil separator (16) for recovering the supplied cutting oil;
A circulation pump (18) connected to the cutting oil separator (16);
A cutting oil storage tank 20 connected between the circulation pump 18 and the cutting oil injection nozzle 14;
A cutting oil auxiliary tank 22 which is positioned above the cutting oil storage tank 20 and additionally supplies the cutting oil that is insufficient according to the oil surface height of the cutting oil storage tank 20;
Solenoid valve 24 for opening and closing the outlet of the cutting oil auxiliary tank 22; And
Cutting oil supply device capable of automatically replenishing the cutting oil of the machine tool, characterized in that it comprises a controller (30) for controlling the operation of the solenoid valve (24). The method of claim 1,
The controller 30 is connected to a storage tank sensor 32 for detecting the oil level of the cutting oil storage tank 20 to control the opening and closing operation of the solenoid valve 24. Coolant supply with automatic refill. The method of claim 1,
When the signal detected by the level auxiliary tank sensor 23 of the cutting oil auxiliary tank 22 is determined to be a supplementary signal, a warning speaker 34 is connected to the controller 30 to generate an alarm sound. Coolant supply to automatically refill coolant in the machine. The method of claim 1,
The cutting oil auxiliary tank 22 is a cutting oil supply device capable of automatically replenishing cutting oil of a machine tool, which is made of a transparent synthetic resin material so as to make it easy to visually check the remaining amount of stored cutting oil. The method of claim 1,
The cutting oil injection nozzle 14 has a nozzle body 141 having a plurality of air curtain holes 141b around the cutting oil injection hole 141a and the cutting oil injection hole 141a formed at the center, and the injection hole 141a. An air housing 142 having an air chamber 142a in communication with and connected to the nozzle body 141;
An air compressor (143) for supplying compressed air to the air chamber (142a);
Cutting oil supply device capable of automatically replenishing the cutting oil of the machine tool, characterized in that it further comprises an air valve (144) for controlling the amount of compressed air supplied to the air chamber (142a).

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