JPH04135138A - Supply device for cutting liquid - Google Patents

Abstract

PURPOSE:To enable the unmanned operation of a machine tool for a long time, by automatically driving a mixing machine with the reduction of the cutting liquid of a cutting liquid tank being detected, and making the cutting liquid with the solution for cutting liquid being mixed with a pressurized water. CONSTITUTION:When a cutting liquid in cutting liquid tanks 41-43 is reduced more than the specified quantity, detection mechanisms 44-46 detect this, the detection signal is fed to a control mechanism 9, water side, solution side valve mechanisms 6, 7 are opened by the command of this control mechanism 9, a pressurized water is fed as a driving fluid to the jet pump of a mixing machine 3, and the solution for cutting liquid is fed to the jet pump as the fluid to be moved from a solution tank 4. The cutting liquid is then made with the pressurized water and the solution for cutting liquid being mixed in this pump, and it is fed to the cutting liquid tanks 41-43 of a machine tool through a cutting liquid supply piping 35. Consequently the necessary cutting liquid can be automatically supplied into the cutting liquid tanks 41-43 of the machine tool, and the long time unmanned operation of the machine tool can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cutting fluid replenishment device that automatically replenishes cutting fluid to machine tools such as machining centers and lathe-grinding machines.

[Conventional technology]

In the above-mentioned machine tools, the amount of cutting fluid decreases when machining a workpiece continues for a long time, so it becomes necessary to replenish the cutting fluid in the cutting fluid tank of the machine tool. In this case, conventionally, upon receiving notification of the decrease in t+J cutting fluid, the operator manually drives a mixing device, and the mixing device mixes water and stock solution for cutting fluid to create cutting fluid.
This is used to replenish the cutting fluid tank of the machine tool when the cutting fluid level has decreased.

[Problem to be solved by the invention]

The conventional replenishment of cutting fluid mentioned above requires human labor, so
There have been problems in that machine tools cannot be operated unattended for long periods of time, and that the burden on workers increases when a large number of machine tools are operated for long periods of time.

This invention solves the above-mentioned problems by detecting a decrease in cutting fluid in the cutting fluid tank of a machine tool and automatically driving a mixer to uniformly disperse the stock solution for cutting fluid in pressurized water. It is possible to create cutting fluid and replenish it in the required amount without the need for human intervention.It is also possible to replenish cutting fluid into the cutting fluid tanks of several machine tools with one machine, allowing unattended operation of machine tools for long periods of time. The purpose of the present invention is to provide an automatic cutting fluid replenishment device that enables the automatic replenishment of cutting fluid.

[Means for Solving the Problems] The cutting fluid replenishment device according to the present invention includes a jet pump and a mixer having a swirling vane fixed in the inner cylinder of the pump, and a cutting fluid replenishment device in an outer box of the device body. a stock solution tank containing stock solution; a water-side valve mechanism provided in a water pipe that supplies pressurized water from outside the device main body to the jet pump as a driving fluid; The cutting fluid supply pipe connected to the discharge side of the jet pump is opened to the cutting fluid tank of the machine tool, and the amount of cutting fluid in the cutting fluid tank is adjusted. A detection mechanism is provided in the cutting fluid tank to detect a decrease in the amount of water and open the water side and undiluted solution side valve mechanisms via a control mechanism, and when replenishment of the cutting fluid is completed, the control mechanism opens the water and undiluted solution side valve mechanisms. It was designed to be closed.

[For production]

In the cutting fluid replenishment device according to the present invention, when the cutting fluid in the cutting fluid tank decreases to a predetermined amount or more, the detection mechanism detects this and sends a detection signal to the control mechanism. , the raw liquid side valve mechanism is opened, pressurized water is supplied as a driving fluid to the jet pump of the mixer, and the raw liquid for cutting fluid is sent from the raw liquid tank to the jet pump as a driven fluid, and the pressurized water and the raw liquid for cutting fluid are mixed in this pump. The cutting fluid can be mixed with the water to produce cutting fluid, which can be supplied to the cutting fluid tank of the machine tool from the cutting fluid supply pipe, and when the cutting fluid supply is completed, the water side is controlled by the control mechanism.

By closing the liquid side valve mechanism, the required amount of cutting fluid can be automatically replenished into the cutting fluid tank of the machine tool without the need for human intervention, allowing long-term unattended operation of the machine tool. . Furthermore, it is possible to supply cutting fluid to several machine tools from one supply device when necessary with a relatively simple structure. Furthermore, since a swirling vane is provided in the inner cylinder of the jet pump, the pressurized water becomes a swirling flow when passing through the vane, and the stock solution for cutting fluid can be uniformly dispersed in this with a simple structure.

(Example) An example of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is the main body of the device, and inside the outer box 2 of the main body 1 are a mixer 3, which will be described later, a stock solution tank 4, a water pipe 6 having a water side valve mechanism 5, and a stock solution side valve. A stock solution piping 8 having a mechanism 7 and a control mechanism 9 are provided.

As shown in FIGS. 2 to 5, the mixer 3 is provided with a jet pump 2 at the top of a body 11.

In the jet pump I2, a fitting hole 13 is formed in the upper part of the fuselage structure 1 and extends horizontally in the left-right direction in FIG. The inner cylinder 1 is attached to the large diameter part provided at the right end of the fitting hole 13 in FIG.
The large-diameter flange portion 14a provided at the base end of the fuselage II is fitted, and this flange portion 14a is pressed against the step of the fitting hole 3 by the holding metal fitting 15, and the holding metal fitting 15 is attached to the fuselage II with the bolt 2.
9, the inner cylinder 14 is fitted into the fitting hole 3.
It is fixed concentrically within the fuselage Il. A rotating plate 6 is fitted and fixed in a position near the tip of the inner cylinder 14, and this rotating plate 16 has an appropriate number of inclined rotating blades l116 such as 8 pieces.
b project radially from the center plate cane portion 16a. As shown in FIG. 2, the base end of a nozzle 17 is fitted and fixed to the left end of the body 11, and the nozzle 17 has a tapered hole 17a formed coaxially with the fitting hole 13 and the inner cylinder 14. A base hole 17b tapered in the opposite direction is formed at the base end of the tapered hole 17a.

The tip 14b of the inner cylinder 14 is loosely inserted into the base hole 17b, and the spout 14d provided at the tip of the inner cylinder 14 is connected to the taper hole 17.
A supply port 1 opened at the base end of a and provided at the base end of the inner cylinder 14
4c is connected to a pressurized water supply source (not shown) via the hole 15a of the presser fitting 15 and the water pipe 6 (see FIG. 1).

A cutting fluid supply gap 18 is formed between the outer peripheral surface of the inner cylinder 14 and the hole wall of the fitting hole 13, and the tip of this gap 18 is connected to the outer peripheral surface of the tip 14b of the inner cylinder 14 and the nozzle 17. The base hole 17b is opened into the gap 18a between the hole wall and the base hole 17b. A supply channel 19 for the stock solution for cutting fluid whose tip communicates with the supply gap 18 is formed in the machine body 11, and the supply channel 19 is connected to the second
As shown in the figure, it is composed of a horizontal upstream flow path 19a and a vertical downstream flow path 19b, and a variable flow valve 20, which will be described later, is disposed between the upstream flow path 19a and the downstream flow path 19b. There is. The supply flow path 19 is the base end opening 19 of the upstream flow path 19a.
c is located below the outer periphery of the inner cylinder 14 and is disposed at the bottom of the body 11, and the base end opening 19c is connected to the stock solution tank 4 (see FIG. 1) via the stock solution piping 8.

The variable flow valve 20 is constructed as follows. That is, the body 11 is provided with a valve body housing hole 21 that communicates with the upstream flow path 19a and the downstream flow path 19b of the supply flow path 19 in a perpendicular axial direction. It is shaped like a table. A truncated conical valve body 22 is fitted into the accommodation hole 21 so as to be rotatable around an axis.
An operating shaft 23 is provided on the large-diameter end surface coaxially with this. The operating shaft 23 covers the accommodation hole 21 and is attached to the body 11 with a screw 2.
It is inserted through a hole cover 25 fixed at 4, and its tip protrudes outside the body 11, and a knob 26 is fitted and fixed to this protrusion. A spring 27 is interposed between the hole cover 25 and the large diameter end face of the valve body 22, and the valve body 22 is urged in the opposite direction to the operating shaft 23 by the spring 27, so that the valve body 22 is housed. It is supported by the hole wall of the hole 21. A communication hole 28 is formed in the outer circumferential surface of the valve body 22, located at the center in the axial direction, and allows communication between the upstream flow path 19a and the downstream flow path 19b. The communication hole 28 is formed at an angle slightly smaller than 180° in the axial direction of the outer peripheral surface of the valve body 22, and has a constant groove width so that the groove bottom 28a forms a smooth curve that deepens from one end to the other. By cutting the valve body 22, the cross-sectional area is changed in the circumferential direction in proportion to the rotation angle of the valve body 22.

Further, as shown in FIG. 1, the water side valve mechanism 5 has a first valve installed in series with the water pipe 6. The stock solution side valve mechanism 7 is composed of a check valve 33 on the stock solution tank 4 side of the stock solution pipe 8 and a third electromagnetic valve 34 on the mixer 3 side.

The base end of a cutting fluid replenishment pipe 35 connected to the taper hole 17a of the mixer 3 is fitted and fixed to the tip of the nozzle 17 of the mixer 3, and the first. Second. The third branch pipes 36, 37, and 38 for replenishment are branched, and a cutting fluid replenishment valve 39.40 consisting of a three-way solenoid valve is provided at the branched portion. The supply branch pipes 36, 37, and 38 are connected to first pipes attached to three machine tools (not shown), respectively. Second. It opens into the third cutting fluid tank 41, 42, 43.

These cutting fluid tanks 41, 42, 43 are provided with detection mechanisms 44, 45, 46, respectively.
5.46 are each composed of a level sensor 47 and a float switch 48.

The control mechanism 9 includes a control circuit 49 that receives detection signals from the level sensor 47 and float switch 48 of the detection mechanisms 44, 45, 46, and a control circuit 49 that operates according to a command from the circuit 49 and operates the first and third electromagnetic circuits for a set time. A timer 50 for operating the valves 31, 34 is provided, and the second electromagnetic valve 32 and the replenishment valve 39, 40 are configured to operate in response to a command from the control circuit 49.

Further, a display 53 is provided above the outer box 2, and the display 53 is provided with red and blue lamps 54, 55 and a buzzer 56, and the stock solution tank 4 is provided with a level sensor 57. . Note that an indicator 51 is provided protruding from the knob 26 of the variable flow rate valve 20 provided in the mixer 3, and a scale plate 52 is provided on the surface of the outer box 2.

In the cutting fluid replenishment device according to the embodiment configured as described above, when the cutting fluid is at a predetermined level or higher in the cutting fluid tanks 41, 42, 43, the first . The third solenoid valve 31.34 and the replenishment valve 39.40 are closed, and only the second solenoid valve 32 is open, and in this state, the jet pump 12 of the mixer 3 is not driven.

When the cutting fluid in the first cutting fluid tank 41 decreases and the cutting fluid level drops below a predetermined level, the level sensor 47 provided in the first cutting fluid tank 41 detects the decrease in cutting fluid, and sends a detection signal to the control circuit. 49, and according to a command from the control circuit 49, the first . At the same time as the third solenoid valve 31.34 is opened, the replenishment valve 39 is activated and the first
Only the supply branch pipe 36 is communicated with the cutting fluid supply pipe 35.

Therefore, water that is pressurized to a predetermined pressure and becomes a driving fluid is supplied into the inner cylinder 14 from the supply port 14c of the inner cylinder 14 through the hole 15a of the presser metal fitting 15 and the water pipe 6. The supplied water is squeezed by the tip 14b of the inner cylinder 14 and ejected to the base end of the taper hole 17a of the nozzle 17, and the gap 18a, the supply gap 18, and the supply channel 19 become under negative pressure. Therefore, when the valve body 22 of the variable flow rate valve 20 is opened to the required opening degree, the water-soluble cutting fluid that becomes the driven fluid flows from the inner cylinder of the stock solution tank 4 through the stock solution piping 8 and the base end opening 19c of the supply channel 19. The stock solution for liquid is supplied to the upstream flow path 19a of the supply flow path 19.

Communication groove 28 of valve body 22. Downstream flow path 19b, supply gap 1
8 and the tapered hole 17a of the nozzle 17 through the gap 18a.
It is sucked into the proximal end and supplied to the proximal end. The supplied stock solution for cutting fluid is mixed with water in the tapered hole 17a, and the cutting fluid that is a mixture of both is sent out from the tip of the nozzle 17 to the supply pipe 35.

In this case, the variable flow valve 20 is controlled by the knob 2 from outside the fuselage 11.
6, the valve body 22 rotates around the axis via the operation shaft 23, and the communication groove 2 rotates in proportion to the rotation angle of the valve body 22.
8 changes the cross-sectional area of the portion of the supply flow path 19 that communicates the upstream flow path 19a and the downstream flow path 19b, and the communication groove 2
The flow rate of the other liquid flowing into the downstream flow path 19b via 8 changes. That is, when the variable flow rate valve 20 is fully closed as shown in FIG. 2 and FIG. Therefore, the other liquid flows into the upstream flow path 19a.
It does not flow from the flow path 19b to the downstream flow path 19b.

Then, when the knob 26 is manually rotated, the operating shaft 2
3, the valve body 22 rotates, and the valve body 22 rotates as shown in FIG. 6(a).
When the communication groove 28 is rotated counterclockwise by 45° from the same figure [existed]), (C), (d), and (e), the portion where the cross-sectional area of the communication groove 28 increases sequentially in proportion to the rotation angle becomes downstream. Side channel 1
It communicates with the upstream end of 9b. For this reason, the upstream flow path 19a
The other liquid flowing from the communication groove 28 to the downstream flow path 19b is throttled according to the cross-sectional area of the communication groove 28 at the communication portion between the communication groove 28 and the upstream end of the downstream flow path 19b. The flow rate of the other liquid increases in proportion to the rotation angle of the valve body 22 from FIG. 6(b) to FIG. 6(e). Therefore, by rotating the valve body 22 by a required angle from the fully closed state shown in FIG. 6(a), the required flow rate of the stock solution for cutting fluid can flow from the upstream flow path 19a to the downstream flow path 19b. .

Note that an indicator 51 is provided on the knob 26 of the variable flow rate valve 20,
By using the scale plate 52 provided on the outer box 2 on the side of the device main body 1, the flow rate of the stock solution for cutting fluid can be obtained according to the rotation angle of the operating shaft 23. With this, the rotation angle of the valve body 22 and the flow rate of the stock solution for cutting fluid can be visually checked from outside the main body 1 of the apparatus.

In addition, water, which is the driving fluid, passes between the inclined swirling vanes 16b of the rotating plate 16 fitted and fixed in the inner cylinder 14, and becomes a swirling flow from the tip of the inner cylinder 14 narrowed to a small diameter. Since it is ejected into the base end of the tapered hole 17a of the nozzle 17, the stock solution for cutting fluid can be drawn into the water from the outer peripheral side and uniformly dispersed and mixed.

Note that when the downstream flow path 19b of the supply flow path 19 has a rectangular cross section such as a square or a rectangle, the flow path of the liquid flowing into the downstream flow path can be controlled with particularly high precision.

The cutting fluid, which is a mixture of water and the stock solution for cutting fluid, is supplied from the supply pipe 35 to the first cutting fluid tank 41 via the first supply branch pipe 36. During this state, the blue lamp 55 of the display 53 is blinking.

When the supply of cutting fluid is completed and the set time has elapsed, timer 5
1st by 0. The third electromagnetic valves 31, 34 are closed, and the supply of pressurized water as the driving fluid is stopped, so that the driving of the jet pump 12 is also stopped.

At this time, the blue lamp 55 is turned on. If the timer 50 or the first solenoid valve 31 stops operating due to a failure, the first
Although the cutting fluid level in the cutting fluid tank 41 rises above the reference position, the float switch 48 provided in the first cutting fluid tank 41 detects this and closes the second solenoid valve 32 according to a command from the control circuit 49. , the pressurized water does not flow into the jet pump 12, and this stops, cutting fluid replenishment also stops, and the replenishment valve 39 closes, and the first cutting fluid tank 4
To prevent the level of the first cutting fluid from rising above a reference position and overflowing from the first cutting fluid tank 41.

In this state, in response to a command from the control circuit 9, the red lamp on the display 53 lights up and the buzzer 56 operates to issue an alarm.

The second solenoid valve 32 automatically closes in the event of a power outage, cutting off the water supply source and preventing water supply.

In addition, when the cutting fluid in the second cutting fluid tank 42 decreases and the level of the cutting fluid drops below a predetermined position, the cutting fluid is removed from the second cutting fluid tank 42.
The level sensor 47 of the cutting fluid tank 42 detects it and sends a detection signal to the control circuit 9, and the replenishment valves 39 and 40 operate in response to a command from the control circuit 9 to replenish only the second replenishment branch pipe 37. When the cutting fluid in the third cutting fluid tank 43 decreases and the level of the cutting fluid drops below a predetermined position, the level sensor 4 of the third cutting fluid tank 42 communicates with the piping 35.
7 is detected, the control circuit 9 operates the replenishment valves 39 and 40, and only the third replenishment branch pipe 38 is communicated with the replenishment pipe 35, thereby cutting into the first cutting fluid tank 41 described above. The second step is done in the same way as replenishing the liquid. The third cutting fluid tank 42, 43 can be replenished with cutting fluid.

In addition, if the cutting fluid in another cutting fluid tank decreases while replenishing cutting fluid to one cutting fluid tank, after replenishing cutting fluid to this cutting fluid tank is completed, continue to the other cutting fluid tank. The cutting fluid is replenished and the level sensor performs detection with a margin of this waiting time.

Further, when the stock solution for cutting fluid in the stock solution tank 4 decreases and the level of this stock solution drops below a predetermined position, a level sensor 57 provided in the stock solution tank 4 detects this and sends this detection signal to the control circuit 9. , the red lamp 54 of the display 53 lights up according to a command from the control circuit 9, and the buzzer 56 turns on.
issues an alarm.

Therefore, in this case, the operator replenishes the stock solution for cutting fluid into the stock solution tank 4 by appropriate means, and when the supply is completed, the red lamp 54 goes out and the alarm from the buzzer 46 also stops.

FIG. 7 shows another embodiment of the invention. This example is 1
This is a case where cutting fluid is supplied to two cutting fluid tanks 41 by one supply device, and the cutting fluid is supplied from the discharge side of the jet pump of the mixer 3 without providing a supply branch pipe or a supply valve in the supply piping 37. This embodiment is the same as the embodiment shown in FIGS. 1 to 5 described above, except that the fluid tank 41 is supplied with a cutting fluid that is a mixture of water and a stock solution for cutting fluid. In addition,
The same reference numerals in FIG. 7 as in FIG. 1 indicate corresponding parts. In the second embodiment described above, when the valve body 22 of the variable flow rate valve 20 provided in the mixer 3 is rotated from outside the device main body 1, the valve body 22
The cross-sectional area of the communication groove 28 at the portion where the downstream side of the supply flow path 19 from the valve body 22 communicates with the communication groove 28 of the valve body 22 continuously changes in proportion to the rotation angle of the valve body 22. By rotating by a required angle, the supply amount of the stock solution for cutting fluid can be controlled with high accuracy, and the mixing ratio of water and the stock solution can be set to a required value (in the range of 0 to 30%).

In addition, water, which is the driving fluid, passes between the inclined swirl vanes 16b of the swirl plate 16 fitted and fixed in the inner cylinder 14, and becomes a swirling flow from the tip of the inner cylinder 14 to the nozzle 17.
With a simple structure, the cutting fluid can be drawn into the spouting water from the outer circumferential side and dispersed uniformly.

Further, detection mechanisms 44, 45 . Replenishment of the cutting fluid is started upon detection by the level sensor 47 installed in the '46, and replenishment is continued for the time set by the timer 50. If the timer 50 or the first solenoid valve 31 malfunctions, the cutting fluid may enter the cutting fluid tank. When it rises above the reference position, the detection mechanism 44.45 detects this.
．． The float switch 48 installed in the cutting fluid tank detects this, closes the second solenoid valve 32, and stops the supply of pressurized water.As a result, the cutting fluid level in the cutting fluid tank rises abnormally and the cutting fluid flows outside the cutting fluid tank. It is possible to reliably prevent water from overflowing and contaminating the area around the tank.

(Effects of the Invention) As explained above, the cutting fluid replenishment device according to the present invention includes a jet pump and a mixer having a swirling vane fixed in the inner cylinder of the pump, and a stock solution tank containing a stock solution for liquid; a water-side valve mechanism provided on a water pipe for supplying pressurized water from outside the device main body to the jet pump as a driving fluid; A stock solution side valve mechanism is provided on the stock solution pipe that supplies the stock solution for cutting fluid, and the cutting fluid supply pipe connected to the discharge side of the jet pump is opened to the cutting fluid tank of the machine tool, and the cutting fluid in the cutting fluid tank is A decrease in the amount of fluid is detected and the control mechanism opens the water side and undiluted solution side valve mechanisms (a detection mechanism is provided in the cutting fluid tank, and when the supply of cutting fluid is completed, the control mechanism opens the water side and undiluted solution side valve mechanisms). Since the valve mechanism is closed, the following effects can be obtained.

That is, in the cutting fluid replenishment device according to the present invention, when the cutting fluid in the cutting fluid tank decreases to a predetermined amount or more, the detection mechanism detects this and sends a detection signal to the control mechanism. Water side.

The stock solution side valve mechanism is opened, pressurized water is supplied as a driving fluid to the jet pump of the mixer, and the stock solution for cutting fluid is sent from the stock solution tank to the jet pump as a driven fluid, and the pressurized water and stock solution for cutting fluid are mixed in this pump. can be mixed to produce cutting fluid, which can be supplied to the cutting fluid tank of the machine tool from the cutting fluid supply pipe, and when the supply of cutting fluid is completed, the water side and raw solution side valve mechanisms are closed by the control mechanism,
The required amount of cutting fluid can be automatically replenished into the cutting fluid tank of a machine tool without the need for human intervention, enabling long-term unmanned operation of the machine tool. Furthermore, it is possible to supply cutting fluid to several machine tools from one supply device when necessary with a relatively simple structure.

Furthermore, since a swirling vane is provided in the inner cylinder of the jet pump, the pressurized water becomes a swirling flow when passing through the vane, and the stock solution for cutting fluid can be uniformly dispersed in this with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing a cutting fluid replenishment device according to an embodiment of the present invention, and FIG. 2 is a fourth diagram showing a mixer of the same embodiment.
3 is a sectional view taken along line AA in the figure, FIG. 3 is a sectional view taken along line BB in FIG. 5, FIGS. 4 and 5 are side and rear views,
Figures (a) to (e) are cross-sectional views showing the valve body and the surrounding area of the valve body of a variable flow valve when the valve body is rotated in the same direction at different angles, and Fig. FIG. 1 is a schematic configuration diagram showing a cutting fluid replenishment device according to an embodiment. 1... Device body, 2... Outer box, 3... Mixer, 4
... Raw solution tank, 5: Water side valve mechanism, 6: Water piping, 7: Raw solution side valve mechanism, 8: Raw solution piping, 9...
・Control mechanism, 11...Mixing body, 12...Jet pump, 14...Inner cylinder, 16...Swivel plate, 16b・
...Swirling vane, 17... Nozzle, 1 day... Supply gap, Work 9... Supply channel, 20... Variable flow rate valve, 22...
... Valve body, 23 ... Operating shaft, 28 ... Communication groove, 35
... Cutting fluid supply pipe, 36, 37. 38 ... Supply branch pipe, 39.40 ... Cutting fluid supply valve, 41, 42゜4
3... Cutting fluid tank, 44, 45.46... Detection mechanism. Figure B Figure

Claims (2)

[Claims] (1) A mixer having a jet pump and a swirling vane fixed in the inner cylinder of the pump in the outer box of the device body;
a stock solution tank containing stock solution for cutting fluid; a water side valve mechanism provided on a water pipe for supplying pressurized water from outside the device main body to the jet pump as a driving fluid; and the stock solution tank as a driven fluid to the jet pump. A undiluted solution side valve mechanism is installed on the undiluted solution piping that supplies undiluted cutting fluid from the jet pump, and the cutting fluid replenishment piping connected to the discharge side of the jet pump is opened to the cutting fluid tank of the machine tool. The cutting fluid tank is provided with a detection mechanism that detects a decrease in the amount of cutting fluid and opens the water side and stock solution side valve mechanisms via a control mechanism, and when the supply of cutting fluid is completed, the control mechanism opens the water side and stock solution side valve mechanisms. A cutting fluid replenishment device characterized by a valve mechanism that closes. (2) The cutting fluid replenishment piping is opened to the cutting fluid tanks of multiple machine tools through multiple replenishment branch pipes equipped with cutting fluid replenishment valves, and the amount of cutting fluid is maintained in each cutting fluid tank. A detection mechanism is provided to detect a decrease in the amount of cutting fluid, and when the detection mechanism detects a decrease in the amount of cutting fluid, the control mechanism opens the cutting fluid replenishment valve of the replenishment branch pipe that opens to the cutting fluid tank where the amount of cutting fluid has decreased. 2. The cutting fluid replenishing device according to claim 1, wherein the valve mechanisms are opened on the water side and the raw solution side.