Fluid discharge system

Abstract

The purpose of the present disclosure is to make it possible to change a position where a fluid is blown without providing a nozzle movable mechanism. The fluid discharge system blows fluid to a predetermined position at a processing site where a workpiece is processed by a tool attached to the main shaft of a machine tool. The fluid discharge system comprises a flow path including a first flow path and a second flow path. The flow path is configured such that fluid is supplied to the inflow part of the first flow path and the inflow part of the second flow path, and the fluid discharged from the outflow part of the first flow path merges with the fluid discharged from the outflow part of the second flow path. The fluid after merging is blown to a predetermined position.

Description

Fluid Dispensing System

[0001] The present disclosure relates to a fluid discharge system that discharges a predetermined fluid, such as cutting coolant, to a predetermined position at a machining site where a workpiece is machined by a tool attached to a spindle of a machine tool.

[0002] In cutting processes, in which workpieces such as metals are cut using machine tool tools, fluids such as cutting coolant are often sprayed onto the tools and the workpiece to improve the quality of the processed area, increase processing efficiency, and extend the tool's lifespan.

[0003] Patent No. 7274673

[0004] According to the above configuration, the cutting coolant cools down the heat generated at the machining point, which is the contact point between the tool and the workpiece, removes chips generated at the machining point, and improves lubrication at the machining point. For this reason, it is desirable to spray the cutting coolant aimed at the machining point.

[0005] However, since machine tools are typically used by switching between different tools, optimizing the position where cutting coolant is sprayed for a specific tool may mean that the cutting coolant cannot be sprayed at the machining point for other tools.

[0006] One possible solution to this problem is to provide multiple nozzles and use each nozzle to spray cutting coolant at each position that could potentially become a machining point depending on the tool selected. However, this solution requires multiple nozzles. In addition, since cutting coolant is sprayed at positions that are not currently machining points, it wastes a lot of power.

[0007] Another possible solution is to provide a nozzle moving mechanism that can change the nozzle direction, allowing the nozzle to be changed to suit the individual tool being used. However, this solution requires the nozzle moving mechanism to be installed close to the nozzle. This raises the risk of the nozzle moving mechanism being splashed with cutting coolant or chips, which could damage the nozzle moving mechanism.

[0008] Another possible solution is to install the nozzle and nozzle moving mechanism away from the machining point. This would reduce the amount of coolant and chips that splash back onto the nozzle moving mechanism. However, this solution requires increasing the pressure of the coolant supplied to the nozzle, which increases power consumption.

[0009] Although the above has been described using the example of spraying cutting coolant onto the machining point, similar problems can also occur when spraying cutting coolant or other liquids or gases onto the machining point or other locations.

[0010] The present disclosure has been made in consideration of the above circumstances, and aims to make it possible to change the position where a fluid such as cutting coolant is sprayed without providing a nozzle moving mechanism.

[0011] The present disclosure relates to a fluid ejection system that sprays a fluid onto a predetermined position at a machining site where a workpiece is machined by a tool attached to a spindle of a machine tool, the fluid ejection system comprising a flow path including a first flow path and a second flow path, the flow paths being configured such that a fluid is supplied to an inlet of the first flow path and an inlet of the second flow path, and the fluid ejected from the outlet of the first flow path and the fluid ejected from the outlet of the second flow path merge together, and the merged fluid is sprayed onto the predetermined position.

[0012] FIG. 1 is a schematic diagram showing a fluid ejection system of a first embodiment; FIG. 2 is a front cross-sectional view showing a flow path and its periphery; FIG. 3 is a perspective view showing a flow path member; FIG. 4 is a front cross-sectional view showing a nozzle of a comparative embodiment and its periphery; FIG. 5 is a perspective view showing a flow path member of a second embodiment; FIG. 6 is a perspective view showing a flow path member of a third embodiment; FIG. 7 is a perspective view showing a flow path member of a fourth embodiment; FIG. 8 is a perspective view showing a flow path member of a fifth embodiment; FIG. 9 is a perspective view showing a flow path member of a sixth embodiment; and FIG. 10 is a schematic diagram showing a fluid ejection system of a seventh embodiment.

[0013] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, the present disclosure is not limited to the following embodiments and can be appropriately modified and implemented within the scope of the present disclosure.

[0014] First Embodiment As shown in Fig. 1, a machine tool 100 includes a spindle 20, a tool changer 30, a moving device 40, a fluid discharge system 80, and a control device 90. Hereinafter, as shown in Fig. 2, three mutually orthogonal directions will be referred to as the "X-axis direction," "Y-axis direction," and "Z-axis direction." "X" in the figure indicates the X-axis direction, "Y" in the figure indicates the Y-axis direction, and "Z" in the figure indicates the Z-axis direction. In this embodiment, the Z-axis direction is the up-down direction, and the X-axis and Y-axis directions are horizontal directions. Hereinafter, the axis of the spindle 20 will be referred to as the spindle axis Az.

[0015] The spindle 20 extends in the Z-axis direction and is configured to be rotatable around the Z-axis. Therefore, the length direction of the spindle axis Az is the Z-axis direction. A tool T is attached to the lower end of the spindle 20 on the spindle axis Az. Hereinafter, the point of contact between the tool T and the workpiece W will be referred to as the "machining point Po." Note that the "machining point Po" may also be read as the "predetermined position."

[0016] The tool changer 30 shown in FIG. 1 is configured to be able to change the tool T attached to the lower end of the spindle 20 with another tool T.

[0017] The fluid discharge system 80 discharges a predetermined liquid, cutting coolant CL. Hereinafter, as shown in Fig. 2, the position onto which the cutting coolant CL discharged from the fluid discharge system 80 is sprayed will be referred to as a "coolant spray position P." The control device 90 shown in Fig. 1 controls the fluid discharge system 80 so that the coolant spray position P shown in Fig. 2 coincides with the machining point Po. Details of this will be described later.

[0018] 1 is configured to be able to move the tool T and the workpiece W relatively. Specifically, the movement device 40 is configured to be able to move the tool T and the workpiece W relatively in five axial directions, for example, the X-axis direction, the Y-axis direction, the Z-axis direction, the direction around the X-axis, and the direction around the Y-axis. However, depending on the application of the machine tool 100, the movement device 40 may be configured to be able to move the tool T and the workpiece W relatively only in predetermined four axial directions, three axial directions, or two axial directions.

[0019] A machining program 91 is input to the control device 90. The control device 90 controls the spindle 20, the tool changer 30, and the moving device 40 in accordance with the machining program 91, thereby performing predetermined machining on the workpiece W.

[0020] Hereinafter, an embodiment in which the fluid discharge system 80R shown in FIG. 4 is installed instead of the fluid discharge system 80 of the present embodiment shown in FIG. 1 will be referred to as a "comparative embodiment." The fluid discharge system 80R of this comparative embodiment includes a nozzle 81 and a nozzle moving mechanism 85. The nozzle 81 discharges cutting coolant CL. The nozzle moving mechanism 85 is configured to change the orientation of the nozzle 81. Therefore, by using this nozzle moving mechanism 85, the orientation of the nozzle 81 can be controlled to the machining point Po in accordance with each individual tool T that is attached to the spindle 20 and used.

[0021] Next, the problems with this comparative example will be described. In this comparative example, the nozzle moving mechanism 85 needs to be installed near the nozzle 81. As a result, there is a risk that the nozzle moving mechanism 85 will be splashed with the cutting coolant CL or chips. This could result in damage to the nozzle moving mechanism 85.

[0022] One possible solution to this problem is to position the nozzle 81 and the nozzle moving mechanism 85 away from the machining point Po. This solution can reduce the amount of rebounded cutting coolant CL and chips that come into contact with the nozzle moving mechanism 85. However, this solution requires increasing the pressure of the cutting coolant CL supplied to the nozzle 81, which increases power consumption.

[0023] In order to solve the above problems, the fluid discharge system 80 of this embodiment shown in Figure 1 is configured as follows: That is, the fluid discharge system 80 includes a flow path 70, a pump 50, and a valve 60, which are described below.

[0024] The flow path 70 includes an upstream flow path 73, a branch point 74, a first flow path 75, and a second flow path 76. The upstream end of the upstream flow path 73 is connected to a pump 50. The pump 50 supplies cutting coolant CL to the upstream flow path 73. The pump 50 is controlled by a control device 90.

[0025] Hereinafter, the inlet portion of the first flow path 75 will be referred to as the "first inlet portion 75i," and the inlet portion of the second flow path 76 will be referred to as the "second inlet portion 76i." The downstream end of the upstream flow path 73 is connected to the first inlet portion 75i and the second inlet portion 76i via a branch point 74. Therefore, cutting coolant CL is supplied from the pump 50 to the first inlet portion 75i and the second inlet portion 76i.

[0026] The valve 60 is provided at the branch point 74. Therefore, the valve 60 is provided for both the first inlet portion 75i and the second inlet portion 76i. A valve drive device 65 that moves the valve 60 is provided for the valve 60. The valve drive device 65 is controlled by the control device 90. Therefore, the control device 90 is configured to be able to control the valve 60.

[0027] When the valve 60 moves toward the first inlet 75i, the passage to the first inlet 75i is narrowed and the passage to the second inlet 76i is widened, thereby decreasing the flow rate of the cutting coolant CL supplied to the first inlet 75i and increasing the flow rate of the cutting coolant CL supplied to the second inlet 76i.

[0028] On the other hand, when the valve 60 moves toward the second inlet 76i, the passage to the second inlet 76i is narrowed and the passage to the first inlet 75i is widened, thereby decreasing the flow rate of the cutting coolant CL supplied to the second inlet 76i and increasing the flow rate of the cutting coolant CL supplied to the first inlet 75i.

[0029] Hereinafter, the balance between the flow rate of the cutting coolant CL supplied to the first inlet 75i and the flow rate of the cutting coolant CL supplied to the second inlet 76i will be simply referred to as the “flow rate balance.” The control device 90 is configured to be able to control the flow rate balance by controlling the valve 60.

[0030] The downstream portion of the first flow path 75 and the downstream portion of the second flow path 76 each branch into multiple branches. Each downstream portion of the first flow path 75 is paired with a corresponding downstream portion of the second flow path 76. While the number of sets is two in FIG. 1 , it may be three, four, or more. It may also be one set.

[0031] 2, the first flow path 75 is provided inside a predetermined first flow path member 70a, and the second flow path 76 is provided inside a predetermined second flow path member 70b. The downstream portion of the first flow path member 70a and the downstream portion of the second flow path member 70b extend along the principal axis Az. Hereinafter, the outlet portion of the first flow path 75 will be referred to as the "first outlet portion 75o," and the outlet portion of the second flow path 76 will be referred to as the "second outlet portion 76o."

[0032] 3, the first flow path member 70a and the second flow path member 70b are each tubular. The second flow path member 70b is located farther from the main axis Az than the first flow path member 70a. The first outlet portion 75o and the second outlet portion 76o are both nozzle-shaped.

[0033] As shown in Fig. 2, the cutting coolant CL is discharged from the first outlet 75o substantially directly downward. On the other hand, the cutting coolant CL is discharged from the second outlet 76o in a direction inclined toward the main axis Az from directly downward. As a result, the cutting coolant CL discharged from the first outlet 75o and the cutting coolant CL discharged from the second outlet 76o merge in mid-air. The merged cutting coolant CL is sprayed onto the machining point Po.

[0034] In other words, the stronger the force of the cutting coolant CL from the first outlet 75o, the further downward the direction of travel of the cutting coolant CL after the merging flows. Therefore, the coolant spray position P becomes further downward. On the other hand, the stronger the force of the cutting coolant CL from the second outlet 76o, the further toward the main axis Az the direction of travel of the cutting coolant CL after the merging flows. Therefore, the coolant spray position P becomes further upward.

[0035] The force of the cutting coolant CL from the first outlet 75o and the force of the cutting coolant CL from the second outlet 76o are determined by the flow rate balance. The control device 90 shown in Figure 1 controls the flow rate balance to adjust the coolant spray position P shown in Figure 2 to the machining point Po.

[0036] Specifically, as shown in Fig. 1, the control device 90 includes a storage unit 95. The storage unit 95 stores the numbers and specifications of tools T that can be attached to the spindle 20 by the tool changer 30. When the tool T attached to the spindle 20 is replaced with a predetermined tool T in accordance with the machining program 91, the control device 90 controls the valve 60 to change the flow rate balance based on the information about the predetermined tool T stored in the storage unit 95. This adjusts the direction of travel of the cutting coolant CL after merging as shown in Fig. 2, and adjusts the coolant spray position P to be the machining point Po of the tool T.

[0037] The configuration and effects of this embodiment are summarized below.

[0038] 2, the cutting coolant CL discharged from the first outlet 75o and the cutting coolant CL discharged from the second outlet 76o merge. Therefore, by simply adjusting the momentum of the cutting coolant CL from the first outlet 75o and the momentum of the cutting coolant CL from the second outlet 72o, the direction of travel of the cutting coolant CL after the merger can be adjusted, and the coolant spray position P can be adjusted to the machining point Po. Therefore, the coolant spray position P can be changed without providing a nozzle movable mechanism 85 as shown in the comparative example in FIG.

[0039] 1, the direction of travel of the cutting coolant CL after merging changes depending on the change in the flow rate balance, that is, the change in the balance between the flow rate of the cutting coolant CL supplied to the first inlet 75i and the flow rate of the cutting coolant CL supplied to the second inlet 76i. Therefore, the coolant spray position P can be adjusted to the machining point Po simply by adjusting the flow rate balance.

[0040] 1, a valve 60 is provided for the first inlet 75i and the second inlet 76i. Therefore, by controlling the valve 60, the flow rate balance can be adjusted and the coolant spray position P can be adjusted to the processing point Po.

[0041] 1 is configured to be able to control the flow rate balance in addition to controlling the machining of workpiece W by machine tool 100. Therefore, the flow rate balance can be adjusted in accordance with the machining by machine tool 100, and the coolant spray position P can be adjusted to the machining point Po.

[0042] Specifically, memory unit 95 of control device 90 registers the number and specifications of tool T. When tool changer 30 changes the tool T used by machine tool 100 to a specified tool T, control device 90 changes the flow rate balance based on the information about the specified tool T stored in memory unit 95. This allows coolant spray position P to be adjusted to the machining point Po of the specified tool T.

[0043] [Second embodiment] Next, a second embodiment will be described with reference to Fig. 5. Note that the following embodiment will be described based on a designated embodiment, focusing on differences from the designated embodiment, and descriptions of points that are the same as or similar to the designated embodiment will be omitted as appropriate.

[0044] In this embodiment, the downstream portion of the first flow path member 70a and the downstream portion of the second flow path member 70b are integrally formed as a single downstream portion 70c. As a result, the first flow path member 70a and the second flow path member 70b are integrated. As a result, the first outlet portion 75o and the second outlet portion 76o are provided in a single member.

[0045] According to this embodiment, the number of parts can be reduced by integrating the first flow path member 70a and the second flow path member 70b. Also, by providing the first outlet portion 75o and the second outlet portion 76o in a single member, the effort of adjusting the angle of the second outlet portion 76o relative to the first outlet portion 75o can be eliminated.

[0046] Third Embodiment Next, a third embodiment will be described with reference to Fig. 6. This embodiment will be described based on the first embodiment.

[0047] In this embodiment, a first annular portion 70aR is formed in a downstream portion of the first flow path member 70a, and a second annular portion 70bR is formed in a downstream portion of the second flow path member 70b. The first annular portion 70aR and the second annular portion 70bR are each annular and surround the principal axis Az around the principal axis Az.

[0048] The first outlet portion 75o is provided annularly around the principal axis Az along the first annular portion 70aR. The second outlet portion 76o is provided annularly around the principal axis Az along the second annular portion 70bR.

[0049] According to this embodiment, the first outflow section 75o and the second outflow section 76o are each arranged in a ring shape around the main axis Az, so that the cutting coolant CL can be sprayed onto the machining point Po from around the main axis Az.

[0050] [Fourth Embodiment] Next, a fourth embodiment will be described with reference to Fig. 7. This embodiment will be described based on the third embodiment.

[0051] In this embodiment, the first annular portion 70aR and the second annular portion 70bR of the third embodiment are integrally formed as a single annular portion 70R. As a result, the first flow path member 70a and the second flow path member 70b are integrated. As a result, the first outflow portion 75o and the second outflow portion 76o are provided in a single member.

[0052] According to this embodiment, it is possible to achieve both the effects of the third embodiment and the effects of the second embodiment. That is, as in the third embodiment, it is possible to spray the cutting coolant CL onto the machining point Po from around the main axis Az. Furthermore, as in the second embodiment, it is possible to reduce the number of parts and to eliminate the need to adjust the angle of the second outlet portion 76o relative to the first outlet portion 75o.

[0053] Fifth Embodiment Next, a fifth embodiment will be described with reference to Fig. 8. This embodiment will be described based on the first embodiment.

[0054] In this embodiment, the downstream portion of the first flow path member 70a and the downstream portion of the second flow path member 70b extend horizontally rather than vertically. Caps 70aC and 70bC are attached to the leading ends of the first flow path member 70a and the second flow path member 70b, respectively. The first outlet portion 75o and the second outlet portion 76o are provided to the sides of the major axis Az. The first outlet portion 75o is provided in a slit shape along the length of the first flow path member 70a. The second outlet portion 76o is provided in a slit shape along the length of the second flow path member 70b.

[0055] According to this embodiment, it can be suitably implemented in a situation where the downstream portion of the first flow path member 70a and the downstream portion of the second flow path member 70b cannot be extended in the vertical direction along the main axis Az.

[0056] Sixth Embodiment Next, a sixth embodiment will be described with reference to Fig. 9. This embodiment will be described based on the fifth embodiment.

[0057] In this embodiment, the downstream portion of the first flow path member 70a and the downstream portion of the second flow path member 70b are integrally formed as a single downstream portion 70c. As a result, the first flow path member 70a and the second flow path member 70b are integrated. As a result, the first outlet portion 75o and the second outlet portion 76o are formed in a single member.

[0058] According to this embodiment, it is possible to achieve both the effects of the fifth embodiment and the effects of the second embodiment. That is, as in the case of the fifth embodiment, this embodiment can be suitably implemented in a situation where the downstream portion of the first flow path member 70a and the downstream portion of the second flow path member 70b cannot be made to extend in the up-down direction along the main axis Az. Furthermore, as in the case of the second embodiment, it is possible to reduce the number of parts and to eliminate the need to adjust the angle of the second outlet portion 76o relative to the first outlet portion 75o.

[0059] Seventh Embodiment Next, a seventh embodiment will be described with reference to Fig. 10. This embodiment will be described based on the first embodiment. However, this embodiment may also be implemented based on the second to sixth embodiments.

[0060] The fluid discharge system 80 includes a first pump 50a and a second pump 50b instead of the valve 60 and the pump 50 of the first embodiment. Hereinafter, the first pump 50a and the second pump 50b will be simply referred to as "pumps 50a, 50b."

[0061] The first pump 50a supplies the cutting coolant CL to the first inlet 75i. The second pump 50b supplies the cutting coolant CL to the second inlet 76i. Both the first pump 50a and the second pump 50b are configured to be able to adjust the flow rate of the supplied coolant. However, instead of this, only one of the first pump 50a and the second pump 50b may be configured to be able to adjust the flow rate of the supplied coolant.

[0062] The first pump 50a and the second pump 50b are both controlled by the control device 90. Therefore, the control device 90 is configured to be able to control the flow rate balance by controlling the pumps 50a and 50b.

[0063] According to this configuration, the flow rate balance can be controlled by controlling the pumps 50a and 50b, and the coolant spray position P can be adjusted to the processing point Po.

[0064] Other Embodiments The above-described embodiment can be modified, for example, as follows. In Fig. 1, the valve 60 is provided for both the first inlet portion 75i and the second inlet portion 76i, but the valve 60 may be provided for only one of them. The coolant spray position P shown in Fig. 2 may be adjusted to a predetermined position other than the processing point Po at the processing site, such as a predetermined position on the tool T or a predetermined position on the workpiece W, instead of the processing point Po.

[0065] 1 may dynamically change the flow path balance to dynamically change the coolant spray position P. The fluid discharged by the fluid discharge system 80 may be a liquid other than the cutting coolant CL, or may be a gas such as air.

[0066] In the third embodiment shown in Fig. 6, the first outlet portion 75o and the second outlet portion 76o may be made to make one full revolution intermittently around the principal axis Az. In this case, the strength of the first annular portion 70aR and the strength of the second annular portion 70bR can be increased by being made to make one full revolution intermittently around the principal axis Az. Similarly, in the fourth embodiment shown in Fig. 7, the first outlet portion 75o and the second outlet portion 76o may be made to make one full revolution intermittently around the principal axis Az.

[0067] [Additional Notes] According to the above embodiment, the fluid ejection system (80) described in Additional Notes 1 to 8 below can be realized.

[0068] [Supplementary Note 1] A fluid discharge system (80) that sprays a fluid (CL) onto a predetermined position (Po) at a processing site where a workpiece (W) is machined by a tool (T) attached to a spindle (20) of a machine tool (100), the fluid discharge system (80) comprising a flow path (70) including a first flow path (75) and a second flow path (76), the flow path (70) being configured such that the fluid (CL) is supplied to an inlet portion (75i) of the first flow path (75) and an inlet portion (76i) of the second flow path (76), and the fluid (CL) discharged from an outlet portion (75o) of the first flow path (75) and the fluid (CL) discharged from an outlet portion (76o) of the second flow path (76) join together, the fluid (CL) after joining being sprayed onto the predetermined position (Po).

[0069] [Appendix 2] The fluid discharge system (80) described in Appendix 1, wherein the direction of travel of the fluid (CL) after the merging changes depending on a change in the flow rate balance between the flow rate of the fluid (CL) supplied to the inlet (75i) of the first flow path (75) and the flow rate of the fluid (CL) supplied to the inlet (76i) of the second flow path (76).

[0070] [Appendix 3] The fluid ejection system (80) described in Appendix 2, wherein a valve (60) is provided for at least one of the inlet portion (75i) of the first flow path (75) and the inlet portion (76i) of the second flow path (76), and the flow rate balance can be controlled by controlling the valve (60).

[0071] [Appendix 4] A fluid discharge system (80) according to Appendix 2, comprising a first pump (50a) that supplies a fluid (CL) to an inlet (75i) of the first flow path (75), and a second pump (50b) that supplies a fluid (CL) to an inlet (76i) of the second flow path (76), wherein at least one of the two pumps (50a, 50b), the first pump (50a) and the second pump (50b), is configured to be able to adjust the flow rate to be supplied, and wherein the flow rate balance is controllable by controlling the pumps (50a, 50b).

[0072] [Appendix 5] The fluid discharge system (80) according to any one of Appendices 2 to 4, wherein the machine tool (100) includes a control device (90) for controlling machining of the workpiece (W) by the machine tool (100), and the control device (90) is further configured to be able to control the flow rate balance.

[0073] [Appendix 6] The fluid discharge system (80) described in Appendix 5, wherein the control device (90) includes a memory unit (95) that registers the number and specifications of a tool (T), and when the tool (T) used by the machine tool (100) is replaced with a predetermined tool (T), the control device (90) changes the flow rate balance based on information about the predetermined tool (T) stored in the memory unit (95).

[0074] [Appendix 7] The fluid ejection system (80) according to any one of Appendices 1 to 6, wherein the outlet portion (75o) of the first flow path (75) and the outlet portion (76o) of the second flow path (76) are formed in one member.

[0075] [Appendix 8] The fluid discharge system (80) according to any one of Appendices 1 to 7, wherein the first flow path (75) and the second flow path (76) are each provided in an annular shape surrounding a main axis (Az) that is the axis of the main shaft (20) around the main axis (Az), an outlet portion (75o) of the first flow path (75) is provided around the main axis (Az) along the first flow path (75), and an outlet portion (76o) of the second flow path (76) is provided around the main axis (Az) along the second flow path (76).

[0076] DESCRIPTION OF SYMBOLS 20 Spindle 50a First pump 50b Second pump 60 Valve 70 Flow path 75 First flow path 75i First inlet portion (inlet portion of first flow path) 75o First outlet portion (outlet portion of first flow path) 76 Second flow path 76i Second inlet portion (inlet portion of second flow path) 76o Second outlet portion (outlet portion of second flow path) 80 Fluid discharge system 90 Control device 95 Memory unit 100 Machine tool Az Spindle line CL Cutting coolant (fluid) Po Machining point (predetermined position) T Tool W Workpiece

Claims

1. A fluid discharge system for spraying a fluid at a predetermined position in a machining site where a workpiece is machined by a tool attached to a spindle of a machine tool, the fluid discharge system comprising a flow path including a first flow path and a second flow path, the flow path being configured such that fluid is supplied to an inlet portion of the first flow path and an inlet portion of the second flow path, and the fluid discharged from an outlet portion of the first flow path and the fluid discharged from an outlet portion of the second flow path merge, and the merged fluid is sprayed at the predetermined position. Fluid discharge system.

2. The fluid discharge system according to claim 1, wherein a traveling direction of the fluid after merging changes due to a change in a flow rate balance between a flow rate of the fluid supplied to an inlet portion of the first flow path and a flow rate of the fluid supplied to an inlet portion of the second flow path.

3. A valve is provided for at least one of the inlet portion of the first flow path and the inlet portion of the second flow path, and the flow rate balance is configured to be controllable by controlling the valve. The fluid discharge system according to claim 2.

4. The fluid discharge system according to claim 2, further comprising a first pump for supplying fluid to an inlet portion of the first flow path and a second pump for supplying fluid to an inlet portion of the second flow path, wherein at least one of the two pumps, the first pump and the second pump, is configured to be able to adjust the flow rate to be supplied, and the flow rate balance is configured to be controllable by controlling the pump.

5. The machine tool includes a control device for controlling machining of the workpiece by the machine tool, and the control device is further configured to be able to control the flow rate balance. The fluid discharge system according to any one of claims 2 to 4.

6. The control device includes a storage unit for registering the number and specifications of the tool, and when the tool used by the machine tool is replaced with a predetermined tool, the control device changes the flow rate balance based on information about the predetermined tool stored in the storage unit. The fluid discharge system according to claim 5.

7. The fluid discharge system according to any one of claims 1 to 6, wherein an outlet portion of the first flow path and an outlet portion of the second flow path are formed in one member.

8. The first flow path and the second flow path are each provided in an annular shape surrounding the main axis line as the axis line of the main shaft around the main axis line. The outflow portion of the first flow path is provided around the main axis line along the first flow path. The outflow portion of the second flow path is provided around the main axis line along the second flow path. The fluid discharge system according to any one of claims 1 to 7.

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