WO2020152834A1

WO2020152834A1 - Machine tool

Info

Publication number: WO2020152834A1
Application number: PCT/JP2019/002345
Authority: WO
Inventors: 合津秀雄
Original assignee: 株式会社Ｆｕｊｉ
Priority date: 2019-01-24
Filing date: 2019-01-24
Publication date: 2020-07-30
Also published as: CN113226636B; JP7132361B2; CN113226636A; JPWO2020152834A1

Abstract

A machine tool which is unlikely to clog, the machine tool having a machining device for machining a workpiece inside a machining chamber, a storage tank for retaining a coolant and machining waste produced from the workpiece, a coolant supply circuit through which the coolant inside the storage tank is delivered to the machining chamber side by means of a coolant pump; a filter mesh that is located inside the storage tank and attached at a position corresponding to the intake port of the coolant pump; and a relief circuit which branches off from the secondary side of the coolant pump in the coolant supply circuit and is provided with a first spray port for spraying coolant on the inside of the filter mesh.

Description

Machine Tools

The present invention relates to a machine tool adapted to prevent clogging of a mesh net provided in a storage tank corresponding to a coolant suction port.

In a machine tool, chips and chips generated from a machined work are washed away with coolant, stored in a storage tank below the machine, and discharged outside the machine by a conveyor. Further, in the machine tool, the coolant stored in the storage tank is sucked up by the pump and is repeatedly fed to the processing chamber side. In such a case, it is necessary to remove chips and the like from the coolant, and a removing member such as a filter or a strainer is used, but then clogging of the filter or the like becomes a problem. In this regard, Patent Document 1 below discloses a technique for preventing clogging of a filter element in an industrial liquid filtering device.

In the filtration device, the cleaning liquid sent from the supply pump is filtered by flowing from the outer peripheral side to the inner side of the filter element. Therefore, foreign matter adheres to the outer peripheral surface of the filter element when the cleaning liquid flows inward from the outer peripheral side. In the conventional example, a cleaning structure using a drain circuit is provided in order to eliminate clogging that occurs on the outer peripheral side of the filter element. Specifically, the flow path that has been blocked by the electromagnetic on-off valve communicates, the cleaning liquid flows back to the liquid storage tank side of the supply pump, and the flow of the cleaning liquid cleans the filter element outer peripheral side. ing.

Utility Model Registration No. 3182493

The conventional clogging prevention technology is designed to clean the filter element by opening the electromagnetic on-off valve. Therefore, during the normal operation when the electromagnetic opening/closing valve is closed, the clogging is progressing, and the suction capability is reduced as time passes. Further, when the conventional technique is replaced with a machine tool, it is difficult to adopt a structure in which the normal flow is switched to the flow for eliminating clogging. Even if the chips and the like clogged in the storage tank are removed, there is no method for positively discharging the chips and the like. Therefore, unless it is carried out of the machine along with the chips by the conveyor, it will ride on the flow of the coolant again and return to the filter or the like.

Therefore, an object of the present invention is to provide a machine tool that is unlikely to cause clogging in order to solve such problems.

A machine tool according to an aspect of the present invention includes a processing device that performs processing on a work in a processing chamber, a storage tank that stores coolant together with processing waste generated from the work, and a coolant pump for the coolant in the storage tank by the processing chamber. To the side of the coolant pump, a mesh net attached to the suction port of the coolant pump located in the storage tank, and a branch on the secondary side of the coolant pump in the coolant supply circuit, And a relief circuit provided with a first ejection port for ejecting the coolant inside the net.

According to the above configuration, in the coolant supply circuit, the coolant in the storage tank is sent to the processing chamber side by the coolant pump, and at that time, chips and the like are filtered by the mesh net at the position where the coolant flows into the suction port of the coolant pump. However, the coolant from the relief circuit branched on the secondary side of the coolant pump is ejected from the first ejection port inside the stiffness net, and clogging of the stiffness net is less likely to occur.

It is a perspective view of the internal structure which showed the machining center. It is the circuit diagram which simplified and showed the coolant device of a machining center. It is a perspective view showing a part of coolant device.

An embodiment of a machine tool according to the present invention will be described below with reference to the drawings. In this embodiment, a machining center will be described as an example of a machine tool. FIG. 1 is a perspective view of the internal structure showing the machining center. The machining center 1 is wholly covered with a machine body cover, and a machining chamber 10 shown by a chain line for executing cutting work of a work is formed therein. The machining center 1 is assembled on a movable bed 11 and has a structure capable of moving in the front-rear direction on a base 3. In the present embodiment, the vertical direction parallel to the main axis will be described as the Z-axis direction, the longitudinal direction of the machine body as the Y-axis, and the width direction as the X-axis.

The machining center 1 is provided with a spindle head 12 for holding a tool in the front part. The spindle head 12 includes a spindle chuck 13 to which a tool such as a drill can be attached and detached, and the attached tool is rotated by a spindle motor 14. The spindle head 12 is mounted on the machining drive device 5 so that it can be moved in the three axial directions in accordance with machining, parts replacement, and the like. In the processing drive device 5, an X-axis slide 22 is mounted on the Y-axis slide 21, and a Z-axis slide 23 is sequentially mounted on the X-axis slide 22. The movement of each slide is configured so that the rotation output of the servo motor is converted into a linear movement by the ball screw mechanism.

A chuck device 15 that rotatably holds a work is provided below the spindle head 12 that is moved by the processing drive device 5. A tool magazine 18 is incorporated inside the chuck device 15 in the machine. The tool magazine 18 stores a plurality of tools between the chuck device 15 and the spindle head 12, and an automatic tool changer is incorporated inside the opening/closing door. Further, the machining center 1 is equipped with a spindle head 12, a chuck device 15, a machining drive device 5, and a control device 7 for controlling the drive of a tool magazine 18 and the like.

The base 3 of the machining center 1 is provided with a storage tank 24 for receiving chips generated in the processing chamber 10 and injected coolant. Lubrication for processing and washing of chips are performed in the processing chamber 10, and the washed chips enter the input port 241 and are stored in the storage tank 24. A screw conveyor is incorporated in the storage tank 24, and the chips accumulated in the storage tank 24 are discharged backward by the rotation of the screw, so that the chips can be collected outside the machine body.

On the other hand, the machining center 1 is provided with a coolant device so that the used coolant accumulated in the storage tank 24 is repeatedly fed to the machining chamber 10 side. FIG. 2 is a circuit diagram showing a simplified coolant device of the machining center 1. The coolant device 9 is configured to use the coolant for lubrication and flushing of chips, and also for spraying from a jet port at the tip of a gun drill mounted on the spindle chuck 13.

The coolant device 9 has a first pump 31 and a second pump 32, and a coolant supply circuit that sucks up the coolant and sends it to the processing chamber 10 is configured in each. The machining center 1 is capable of drilling while injecting a coolant at high pressure during machining through a center hole formed in a drill, and the first pump 31 is a high-pressure pump therefor. The second pump 32, which has a lower pressure than that of the first pump 31, is for flushing chips generated during machining, and for feeding a coolant used for lubrication and flushing of a machining point of a workpiece.

Here, FIG. 3 is a perspective view showing a part of the coolant device 9. A coolant suction chamber 25 is formed on the rear side of the storage tank 24, and a first coolant pipe 41 connected to the high-pressure first pump 31 and a second coolant pipe 42 connected to the second pump 32 are suctioned therein. The mouth is inserted. In particular, a columnar strainer 26 is provided in the suction chamber 25, and the suction port of the first coolant pipe 41 is connected thereto. On the other hand, in the second coolant pipe 42, the cyclone filter 33 (see FIG. 2) is provided on the secondary side of the second pump 32.

The strainer 26 is made of punching metal with a hole having a diameter of 3 mm, and prevents chips and the like from entering the first coolant pipe 41. However, the chips and the like removed by a certain amount of use cause the strainer 26 to be clogged. Therefore, the strainer 26 needs to be cleaned in order to maintain its function. However, since the strainer 26 is incorporated in the suction chamber 25, it cannot be easily cleaned. This is because the suction chamber 25 and the machining center 1 located thereabove must be moved or disassembled for cleaning. Therefore, the machining center 1 has a structure for preventing the strainer 26 from being clogged.

Specifically, a mesh net basket 27 is installed in front of the suction chamber 25 where the strainer 26 is located. The mesh net basket 27 is formed of an 18-mesh wire mesh of about 1 mm square in the shape of a rectangular cylinder, and is attached to the corner of the storage tank 24 so as to close the opening 251 of the suction chamber 25. The mesh net basket 27 directly closes the opening 251 of the suction chamber 25 by the surface on the short side (the surface that is paired with the second surface 272), and the space inside the mesh net 28 is formed in the front part thereof. Therefore, in the coolant sucked into the first pump 31 via the strainer 26, chips and the like are mainly filtered by the first surface 271 and the second surface 272 of the mesh net cage 27.

By the way, since the mesh net cage 27 uses a wire mesh with very fine mesh, it is apt to be clogged and if left as it is, the suction capacity of the coolant in the first and

second pumps

31 and 32 is deteriorated. .. On the other hand, even the mesh net basket 27 is located under the machining center 1, so cleaning it becomes a difficult task. In this respect, in the present embodiment, a configuration is adopted in which the mesh net cage 27 is less likely to be clogged, and in particular, the coolant device 9 originally included in the machining center 1 is used.

As shown in FIG. 2, the coolant device 9 includes a high-pressure side flow path in which a first coolant pipe 41 connected to a first pump 31 extends to the processing chamber 10 side, and a second coolant connected to a second pump 32. A pipe 42 extends to the processing chamber 10 via the cyclone filter 33 to form a coolant supply circuit by a low-pressure side flow path. Further, in the coolant device 9, the high pressure side relief flow path by the first relief pipe 43 branched from the first coolant pipe 41 and the second coolant pipe 42 are provided on the secondary side of the first pump 31 and the second pump 32. A relief circuit is formed by the second relief pipe 44 and the low-pressure side relief flow passage. In the relief circuit,

leaf valves

35 and 36 are arranged in the first and

second relief pipes

43 and 44, and extend into the storage tank 24.

By the way, the coolant is not always ejected on the processing chamber 10 side, and adjustment is performed by an electromagnetic opening/closing valve (not shown) provided in the Courant supply circuit. Still, while the machining center 1 is in operation, the first and

second pumps

31 and 32 are constantly driven to suck up the coolant in the storage tank 24. This is because the first and

second pumps

31 and 32 may be out of order if the drive is frequently switched according to the amount of coolant used. Therefore, an excessive amount of coolant is relieved, and the relieved coolant is almost always returned to the storage tank 24 side.

In the present embodiment, the coolant that has been simply returned to the storage tank 24 is used to prevent clogging of the newly provided mesh net cage 27. The coolant in the storage tank 24 enters the inside of the mesh net basket 27 from the outside and flows into the suction chamber 25. Therefore, chips and the like are filtered by the outer surface of the mesh net cage 27 facing the inside of the storage tank 24, that is, the first surface 271 and the second surface 272. Therefore, the relief coolant is configured to flow from the inside to the outside of the mesh net cage 27 so that the chips are unlikely to adhere to the outer surface of the mesh net basket 27.

Since the machining center 1 is provided with the high-pressure first pump 31, the ejection port 431 of the first relief pipe 43 is provided in the space 28 inside the mesh net inside the mesh net cage 27. The spout 431 is arranged at a position near the opening 251 of the suction chamber 25, and the spouting direction thereof faces the first surface 271 of the mesh net cage 27. Therefore, the backwash relief flow ejected from the ejection port 431 flows toward the first surface 271 as indicated by the arrow, and is particularly applied obliquely instead of directly in front. The backwash relief flow allows the coolant to flow into the suction chamber 25 and acts as a resistance to prevent chips and the like from sticking to the mesh net basket 27.

By the way, the coolant device 9 of the machining center 1 is provided with a high-pressure first pump 31, but there are machine tools without such a high-pressure pump. In that case, the ejection port 441 of the second relief pipe 44 connected to the second pump 32 is piped so as to be located in the space 28 in the net. Then, next, since the first pump 31 is provided in the present embodiment, the coolant sent from the second pump 32 is given another role, and the above-described function of the first pump 31 for preventing clogging in the backwash coolant. The configuration is taken to assist.

In this embodiment, the ejection port 441 of the second relief pipe 44 is provided outside the mesh net cage 27. In particular, the ejection port 441 is provided at a position close to the opening 251 of the suction chamber 25, and its ejection direction is substantially parallel to the first surface 271 and is provided laterally. Therefore, the auxiliary relief flow ejected from the ejection port 441 flows along the first surface 271 as indicated by the arrow. Such an auxiliary relief flow acts so as to disperse chips and the like whose sticking to the first surface 271 is stopped by the backwash relief flow from the first pump 31 from the spot.

Therefore, according to the machining center 1, the tool mounted on the spindle head 12 is rotated, and at the same time, the tool is moved in the three axis directions by the drive control of the machining drive device 5, and the workpiece gripped by the chuck device 15 is moved. Processing is performed on the other hand. In the meantime, the coolant sucked up by the second pump 32 is sent to the processing chamber 10 through the second coolant pipe 42 to lubricate or wash the work processing point, and after the processing, near the inlet 241. The coolant is flown from the nozzle, and the chips and the like remaining in the processing chamber 10 are washed off into the storage tank 24. On the other hand, in the drilling process by the high pressure injection of the coolant by the drill, the coolant is sent from the first pump 31 through the first coolant pipe 41.

During operation of the machining center 1, the first and

second pumps

31 and 32 are driven so that a coolant flows into the suction chamber 25 in the storage tank 24. However, since there is a fine mesh basket 27 in front of it, chips and the like are hardly filtered, and the strainer rarely reaches the strainer 26. Then, in the mesh net basket 27, the sticking of chips and the like is restricted by the backwash relief flow ejected from the ejection port 431, and the chips and the like are scattered from the spot by the auxiliary relief flow ejected from the ejection port 441. Therefore, the mesh net cage 27 is less likely to be clogged, and the chips floating in the storage tank 24 are discharged by the screw conveyor.

Although one embodiment of the present invention has been described above, the present invention is not limited to these, and various modifications can be made without departing from the spirit of the present invention.
For example, the position and direction of the ejection port of the relief pipe provided in the medium net space 28 may be appropriately changed depending on the characteristics of the coolant flow.

1... Machining center 5... Machining drive device 7... Control device 9... Coolant device 10... Machining room 24... Storage tank 26... Strainer 27... Mesh net basket 31... First pump 32... Second pump 33... Cyclone filter 41... First Coolant pipe 42...Second coolant pipe 43...First relief pipe 44...

Second relief pipe

35,36...Leaf valve

Claims

A processing device that performs processing on a workpiece in a processing chamber,
A storage tank that collects coolant together with the processing waste generated from the work,
A coolant supply circuit that sends the coolant in the storage tank to the processing chamber side by a coolant pump,
A mesh net attached corresponding to the suction port of the coolant pump located in the storage tank,
A relief circuit provided with a first ejection port that branches off on the secondary side of the coolant pump in the coolant supply circuit and ejects coolant inside the mesh net;
Machine tool having.
The machine tool according to claim 1, wherein the first ejection port of the relief circuit is installed so as to be applied from a direction facing the surface of the stiffness net.
The coolant supply circuit has a high pressure side flow passage in which a high pressure side coolant pump having a high discharge pressure is piped, and a low pressure side flow passage in which a low pressure side coolant pump whose discharge pressure is lower than the high pressure side coolant pump is piped. ,
In the relief circuit, the first ejection port is provided in a high-pressure side relief flow path branched from the high-pressure side flow path, and the low-pressure side relief flow path branched from the low-pressure side flow path is located outside the knot net. A second outlet for coolant is provided,
The machine tool according to claim 1 or 2.
The machine tool according to claim 3, wherein the second ejection port of the relief circuit is oriented in a direction along the surface of the stiffness net.