JP2022007259A - Cutting liquid tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more effectively prevent sludge from accumulating in a wide range in a tank body while suppressing an increase in cutting fluid temperature and an increase in power consumption.
SOLUTION: A cutting fluid tank 1 is provided in a tank main body 10 and a cutting fluid inflow portion 2 in which sludge-containing cutting fluid discharged from a machining portion of a machine tool flows into a predetermined inflow portion of the tank main body 10. A cutting fluid supply unit 7 provided at a predetermined pumping point of the tank body 10 for pumping the cutting fluid stored in the tank body 10 and supplying it to the machining unit, a cutting fluid inflow unit 2 and a cutting fluid supply unit 7 are provided. The cutting fluid flow path P formed in the tank body 10 so as to be connected and the sludge-containing cutting fluid are temporarily pumped from the cutting fluid flow path P to remove sludge, and the cleaned cutting fluid is returned to the cutting fluid flow path. It is equipped with a cutting fluid cleaning device 4 that returns to P.
[Selection diagram] Fig. 1

Description

The present invention relates to a cutting fluid tank used in a machine tool such as a machining center or a lathe.

For example, in machine tools that perform cutting such as machining centers and lathes, cutting fluid (coolant) is generally used for the purpose of lubricating and cooling tools and discharging sludge.
The cutting fluid discharged from the cutting fluid supply pump toward the machining chamber (machining section) of the machine tool where the machining of the workpiece is performed is discharged from the machining section together with sludge such as chips scraped from the workpiece. After the relatively large sludge mixed in the discharged cutting fluid is separated and removed by a chip conveyor or filter, it flows into the tank body of the cutting fluid tank and is temporarily stored, and the cutting fluid is temporarily stored from here. It is supplied to the processing section again by the supply pump.
Here, relatively small sludge that could not be separated and removed by the chip conveyor or filter flows into the tank body together with the cutting fluid, but the cutting fluid with the sludge mixed in flows into equipment such as the cutting fluid supply pump. If sucked, not only the equipment may be damaged or malfunctioned, but also if the cutting fluid containing sludge is supplied to the machined portion, there is a risk of machining defects.
In addition, sludge mixed in the cutting fluid may accumulate on the bottom of the tank body, which may reduce the effective volume of the tank body, that is, the volume for storing the cutting fluid itself, and the cutting fluid may rot and work environment. Was at risk of being damaged.
Furthermore, since sludge precipitates and accumulates at the bottom of the tank body, it is difficult to grasp the state and amount of accumulation at first glance, and the work of removing the accumulated sludge also requires a great deal of time and effort. rice field.

Therefore, for example, as described in Patent Documents 1 and 2 below, a cutting fluid tank is provided in which a screw for stirring the cutting fluid is installed in the tank body of the cutting fluid tank to prevent sludge from accumulating on the bottom of the tank body. Are known.

Japanese Unexamined Patent Publication No. 2004-114221 Japanese Unexamined Patent Publication No. 2-106248

However, when a screw is installed in the tank body as in the cutting fluid tanks of Patent Documents 1 and 2, the effect is limited to a certain range in the tank body, and sludge accumulates in a wide range in the tank body. It could not be effectively prevented. In addition, there are problems such as an increase in the cutting fluid temperature and an increase in power consumption due to the drive of the motor and the rotation of the screw.

An object of the present invention has been made in view of the above problems, and it is more effective to deposit sludge over a wide area in the tank body while suppressing an increase in cutting fluid temperature and an increase in power consumption. The purpose is to provide a cutting fluid tank that can be prevented.

The present invention comprises the following aspects in order to achieve the above object.

1) The tank body and
A cutting fluid inflow section provided at a predetermined inflow point of the tank body and into which sludge-containing cutting fluid discharged from the machining section of the machine tool flows.
A cutting fluid supply unit provided at a predetermined pumping point of the tank body and pumping the cutting fluid stored in the tank body and supplying it to the processing unit.
A cutting fluid flow path formed in the tank body so as to connect the cutting fluid inflow portion and the cutting fluid supply portion, and the cutting fluid flow path.
A cutting fluid tank equipped with a cutting fluid cleaning device that temporarily pumps sludge-containing cutting fluid from the cutting fluid flow path, removes sludge, and returns the cleaned cutting fluid to the cutting fluid flow path again. ..

2) The cutting fluid supply unit has a first pump for pumping cutting fluid from the pumping point.
The cutting fluid purifying device is connected to a second pump that temporarily pumps sludge-containing cutting fluid from the cutting fluid flow path, and a base end connected to the second pump, and the tip of the cutting fluid flow path in the cutting fluid flow path. The above-mentioned having a bypass flow path provided with a first discharge section for discharging the purified cutting fluid at a position on the downstream side of the second pump, and a sludge removing section provided in the middle of the bypass flow path. The cutting fluid tank described in 1).

3) The cutting fluid tank according to 2) above, wherein a sludge removing filter is provided between the second pump and the first discharge portion in the cutting fluid flow path.

4) Further, the cutting fluid cleaning device branches from a portion downstream of the sludge removing portion in the bypass flow path, and a second discharge portion that discharges the cleaned cutting fluid to the pumping portion is provided at the tip. The cutting according to 2) or 3) above, which has a branch flow path for backwashing and a flow path switching means for switching the flow of the cleaned cutting fluid to the bypass flow path or the branch flow path for backwashing. Liquid tank.

According to the cutting fluid tank of 1) above, the cutting fluid containing sludge flowing in the cutting fluid flow path in the tank body is pumped up and once taken out of the cutting fluid flow path to remove sludge and clean the cutting fluid. By returning to the cutting fluid flow path again, the amount of sludge contained in the cutting fluid flowing through the cutting fluid flow path is reduced, and sludge can be effectively prevented from accumulating in a wide range in the tank body. The amount of sludge contained in the cutting fluid supplied to the machined portion is also reduced. Further, since it is not necessary to install a motor or a screw on the tank body, it is possible to effectively suppress an increase in the cutting fluid temperature and an increase in power consumption.

According to the cutting fluid tank in 2) above, the cutting fluid purifier connects to the second pump that pumps sludge-containing cutting fluid from the cutting fluid flow path and the second pump at the base end, and the cutting fluid at the tip. By having a bypass flow path provided with a first discharge portion located on the downstream side of the second pump of the flow path and a sludge removing section provided on the bypass flow path, the cutting fluid containing sludge can be reliably removed. It is possible to remove sludge and prevent sludge from accumulating in the tank body more effectively. In addition to the above configuration of the cutting fluid cleaning device, since the cutting fluid supply unit has the first pump, it is possible to effectively suppress an increase in the cutting fluid temperature and an increase in power consumption.

According to the cutting fluid tank in 3) above, the sludge-containing cutting fluid that could not be pumped by the second pumping pump is removed because the filter is provided between the second pumping pump and the first discharging portion of the cutting fluid flow path. Even if it flows to the first discharge portion side, it is possible to prevent sludge from being mixed in the cleaned cutting fluid.

According to the cutting fluid tank of 4) above, the cutting fluid cleaning device branches from the downstream side of the sludge removing portion of the bypass flow path, and discharges the cleaned cutting fluid to the pumped portion at the tip. By having a backwash branch flow path having a portion and a flow path switching means for switching the flow of the cleaned cutting fluid to a bypass flow path or a backwash branch flow path, the second discharge section can be used. Not only is the sludge accumulated near the pumping point washed away by the discharged cutting fluid, but the flow is opposite to the flow for supplying the cutting fluid in the cutting fluid flow path to the machining section (flow during normal use of the cutting fluid tank). Flow is generated, and sludge accumulated by the flow during normal use is washed away in the entire cutting fluid flow path. Then, the washed-out sludge is pumped up together with the cutting fluid by the second pumping pump, and is removed by the sludge removing portion in the bypass flow path. This makes it possible to more effectively prevent sludge from accumulating over a wide area in the tank body.

It is a schematic diagram which shows the flow of the cutting fluid at the time of normal use of the cutting fluid tank which concerns on embodiment of this invention. It is a schematic diagram which shows the flow of the cutting fluid at the time of backwashing of the cutting fluid tank which concerns on embodiment of this invention.

Hereinafter, the cutting fluid tank according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

As shown in FIG. 1, the cutting fluid tank (1) includes a tank body (10) for storing the cutting fluid. A cutting fluid inflow section (2) is provided at a predetermined inflow point of the tank body (10), and sludge-containing cutting fluid discharged from a machining section of a machine tool (not shown) is tanked from the cutting fluid inflow section (2). It is flowing into the main body (10). In addition, a cutting fluid supply section (7) for pumping the cutting fluid stored in the tank body (10) and supplying it to the machining section is provided at a predetermined pumping point of the tank body (10) for cutting. The liquid supply unit (7) has one or more (three in this embodiment) first pump (70) for pumping the cutting fluid. A cutting fluid flow path (P) is formed in the tank body (10) so as to connect the cutting fluid inflow section (2) and the cutting fluid supply section (7) (first pump (70)). When supplying the cutting fluid to the machining section (during normal use), the sludge-containing cutting fluid that has flowed in from the cutting fluid inflow section (2) draws the cutting fluid flow path (P) into the first pump of the cutting fluid supply section (7). It flows toward (70). The number of the first pumps (70) is not particularly limited, and may be appropriately changed depending on the size and shape of the tank body (10).

Further, the cutting fluid tank (1) temporarily pumps the sludge-containing cutting fluid from the cutting fluid flow path (P), removes the sludge, and returns the cleaned cutting fluid to the cutting fluid flow path (P) again. , Equipped with a cutting fluid cleaning device (4).

The details of the cutting fluid cleaning device (4) will be described below. The upstream and downstream in the following description are the flow of the cutting fluid formed in the cutting fluid flow path (P) during normal use of the cutting fluid tank (1), that is, when the cutting fluid is supplied to the machining portion. The cutting fluid inflow section (2) is on the upstream side, and the cutting fluid supply section (7) is on the downstream side.

The cutting fluid cleaning device (4) is provided in the vicinity of the cutting fluid inflow portion (2) in the cutting fluid flow path (P), and is one that temporarily pumps sludge-containing cutting fluid from the cutting fluid flow path (P). It has the above (one in this embodiment) second pump (41). The installation position of the second pump is preferably on the upstream side, more preferably near the cutting fluid inflow portion (2), but is not limited to this, and may be a position avoiding interference with other components. It is also possible to dare to install it in a place where sludge is likely to accumulate so that sludge can be sucked up effectively. Further, the number of the second pumps (41) is not particularly limited, and may be appropriately changed depending on the size and shape of the tank body (10).

The cutting fluid cleaning device (4) is further connected to the second pump (41) at the base end, and is cleaned at the tip on the downstream side of the second pump (41) in the cutting fluid flow path (P). It has a bypass flow path (C1) provided with a first discharge portion (43) for discharging the converted cutting fluid. The location where the purified cutting fluid is discharged from the first discharge portion (43) in the cutting fluid flow path (P) is preferably near the second pump (41), but downstream of the second pump (41). If there is no particular limitation, it may be installed in a place where sludge is likely to accumulate to suppress sludge accumulation.

A sludge removing portion (42) is provided in the middle of the bypass flow path (C1), and is pumped from the cutting fluid flow path (P) by the second pump (41) and taken out to the bypass flow path (C1). The sludge-containing cutting fluid is cleaned by removing sludge. As the sludge removing unit (42), a filter having a function of removing only sludge from the sludge-containing cutting fluid, for example, is used.

Further, the cutting fluid cleaning device (4) branches from a portion downstream of the sludge removing portion (42) in the bypass flow path (C1), and is near the pumping portion at the tip, that is, the first pump (70). A branch flow path for backwashing (C2) having a second discharge portion (44) for discharging the cleaned cutting fluid in the vicinity of the above, and the bypass flow path (C1) or the bypass flow path (C1) for flowing the cleaned cutting fluid. A flow path switching means for switching to the backwash branch flow path (C2) (in this embodiment, an on-off valve (45) provided in the middle of each of the branched bypass flow path (C1) and the backwash branch flow path (C2). ) (46)) and. The on-off valves (45) and (46) are controlled by a control device (not shown). The flow path switching means is not limited to the on-off valve (45) (46), and for example, a two-way switching valve may be provided at the branch point of the bypass flow path (C1) and the backwash branch flow path (C2). ..

As described above, the cutting fluid cleaning device (4) of this embodiment has a second pump (41), a sludge removing section (42), a first discharging section (43), a second discharging section (44), and opening / closing. It consists of a valve (45) (46), a bypass flow path (C1) and a backwash branch flow path (C2).

Further, a sludge removing filter is provided between the second pump (41) and the first discharge portion (43) in the cutting fluid flow path (P).

Next, in the use of the cutting fluid tank (1) according to this embodiment, when the cutting fluid is supplied to the machine tool machine tool (during normal use), and by the flow of the cutting fluid in the direction opposite to that during normal use. The flow of cutting fluid in each case of washing away sludge accumulated on the bottom of the tank body (10) during normal use (during backwashing) will be described.

[Normal use]
First, the flow of the cutting fluid during normal use will be described with reference to the arrows in FIG.

The sludge-containing cutting fluid discharged from the machining section of the machine tool flows into the tank body (10) from the cutting fluid inflow section (2) and flows through the cutting fluid flow path (P) toward the first pump (70). It flows. Then, the sludge-containing cutting fluid is pumped by the second pump (41) provided in the middle of the cutting fluid flow path (P), and is temporarily taken out to the bypass flow path (C1). The sludge-containing cutting fluid taken out to the bypass flow path (C1) is cleaned by removing sludge at the sludge removing section (42). Then, the on-off valve (45) is opened and the on-off valve (46) is closed by the control device, and the cleaned cutting fluid passes through the on-off valve (45) and passes through the bypass flow path (C1). The flow flows and is discharged from the first cutting fluid discharge port (43) to the cutting fluid flow path (P). The purified cutting fluid returned to the cutting fluid flow path (P) flows through the cutting fluid flow path (P), is pumped by the first pump (70), and is supplied to the machining section.

The sludge-containing cutting fluid that has flowed in from the cutting fluid inflow portion (2) is cleaned in the bypass flow path (C1) and returned to the cutting fluid flow path (P) again. Even if the entire amount of sludge-containing cutting fluid cannot be pumped by the second pump (41) and some of the sludge-containing cutting fluid flows directly through the cutting fluid flow path (P), the second pumping fluid is pumped. Cleaning discharged from the first cutting fluid discharge port (43) because sludge is removed when passing through the filter (8) provided between the pump (41) and the first cutting fluid discharge port (43). No sludge is mixed in the cutting fluid.

When the flow rate of the purified cutting fluid in the cutting fluid flow path (P) downstream from the first cutting fluid discharge port (43) increases, the cutting fluid discharged from the first cutting fluid discharge port (43) A part of it becomes surplus, but the surplus cutting fluid passes through the filter (8), is pumped again by the second pump (41), and is taken out to the bypass flow path (C1). Therefore, the discharge of the cutting fluid from the first discharge portion (43) and the flow of the cutting fluid toward the first pump (70) are not obstructed by the excess cutting fluid.

As described above, during normal use of the cutting fluid tank, the cutting fluid flows from the cutting fluid inflow part (2) → the cutting fluid flow path (P) → the second pump (41) → the bypass flow path (C1) → sludge removal. Part (42) → Bypass flow path (C1) → First cutting fluid discharge port (43) → Cutting fluid flow path (P) → First pump (70).

[At the time of backwash]
Next, the flow of the cutting fluid during backwashing will be described with reference to the arrows in FIG. The process from the cutting fluid inflow section (2) to the cleaning of the sludge-containing cutting fluid flowing into the cutting fluid flow path (P) by the sludge removing section (42) is the same as in normal use, so it is omitted. ..

The on-off valve (45) is closed and the on-off valve (46) is opened by the control device. The cutting fluid cleaned by the sludge removing portion (42) passes through the on-off valve (46), flows through the backwash branch flow path (C2), and flows from the second cutting fluid discharge port (44) to the cutting fluid flow path (44). It is discharged to the vicinity of the first pump (70) of P). The purified cutting fluid discharged from the second cutting fluid discharge port (44) to the vicinity of the first pump (70) is used for normal use after washing away sludge accumulated in the vicinity of the first pump (70). Flows in the direction opposite to the flow of the cutting fluid in the cutting fluid flow path (P), and flows to the second pump (41) while washing away the sludge accumulated in the entire cutting fluid flow path (P) during normal use. It flows toward. The cutting fluid containing the washed-out sludge is pumped by the second pump (41) after the sludge is removed when passing through the filter (8) provided in front of the second pump (41). It is taken out to the bypass flow path (C1). The cutting fluid taken out to the bypass flow path (C1) is further sludge-removed by the sludge removing portion (42).

As described above, when the cutting fluid tank is backwashed, the cutting fluid flows from the cutting fluid inflow part (2) → the cutting fluid flow path (P) → the second pump (41) → the bypass flow path (C1) → sludge removal. After passing through the same flow as in normal use called part (42), sludge removal part (42) → backwash branch flow path (C2) → second cutting fluid discharge port (44) → cutting fluid flow path (P) → Filter (8) → 2nd pump (41) → Bypass flow path (C1) → Sludge removal part (42) can be looped.

After cleaning the cutting fluid flow path (P) by backwashing, the on-off valve (45) is opened and the on-off valve (46) is closed by the control device, and the cutting fluid tank (1) is used again normally. Returned to.

In normal use, the cutting fluid tank (1) pumps up the sludge-containing cutting fluid flowing through the cutting fluid flow path (P) in the tank body (10), temporarily takes it out of the cutting fluid flow path (P), and sludge. By removing the cutting fluid and returning the cleaned cutting fluid back to the cutting fluid flow path (P), the amount of sludge contained in the cutting fluid flowing through the cutting fluid flow path (P) is reduced, and the tank body (10). ) Can effectively prevent sludge from accumulating in a wide range, and the amount of sludge contained in the cutting fluid supplied to the machined portion is also reduced. Furthermore, during backwashing, not only the sludge accumulated near the pumping point is washed away, but also the sludge accumulated in the cutting fluid flow path (P) during normal use is washed away by the flow in the opposite direction to the flow during normal use. The washed-out sludge is reliably removed by the filter (8) and the sludge remover (42). In this way, it is possible to more effectively prevent sludge from accumulating in a wide range in the tank body (10), and at the time of normal use after backwashing, the amount of sludge contained in the cutting fluid supplied to the machined portion can be reduced. It can be reduced more reliably.

According to the above embodiment, it is possible to more effectively prevent sludge from accumulating in a wide range in the tank body (10) while suppressing an increase in the cutting fluid temperature and an increase in power consumption.

INDUSTRIAL APPLICABILITY The present invention is suitably used for a machine tool in which a cutting fluid is used for the purpose of lubricating / cooling a tool and discharging sludge, for example.

(1): Cutting fluid tank
(10): Tank body
(2): Cutting fluid inflow part
(4): Cutting fluid purifier
(41): Second pump
(42): Sludge remover (filter)
(43): First discharge port
(44): Second discharge port
(45), (46): Flow path switching means (on-off valve)
(7): Cutting fluid supply unit
(70): First pump
(8): Filter
(P): Cutting fluid flow path
(C1): Bypass flow path
(C2): Backwash branch flow path

Claims (4)

With the tank body
A cutting fluid inflow section provided at a predetermined inflow point of the tank body and into which sludge-containing cutting fluid discharged from the machining section of the machine tool flows.
A cutting fluid supply unit provided at a predetermined pumping point of the tank body and pumping the cutting fluid stored in the tank body and supplying it to the processing unit.
A cutting fluid flow path formed in the tank body so as to connect the cutting fluid inflow portion and the cutting fluid supply portion, and the cutting fluid flow path.
A cutting fluid tank equipped with a cutting fluid cleaning device that temporarily pumps sludge-containing cutting fluid from the cutting fluid flow path, removes sludge, and returns the cleaned cutting fluid to the cutting fluid flow path again. .. The cutting fluid supply unit has a first pump for pumping cutting fluid from the pumping point.
The cutting fluid purifying device is connected to a second pump that temporarily pumps sludge-containing cutting fluid from the cutting fluid flow path, and a base end connected to the second pump, and the tip of the cutting fluid flow path in the cutting fluid flow path. A claim having a bypass flow path provided with a first discharge section for discharging the purified cutting fluid at a location on the downstream side of the second pump, and a sludge removing section provided in the middle of the bypass flow path. Item 1. The cutting fluid tank according to Item 1. The cutting fluid tank according to claim 2, wherein a sludge removing filter is provided between the second pump and the first discharge portion in the cutting fluid flow path. Further, the reverse cutting fluid cleaning device has a second discharge portion that branches from a portion downstream of the sludge removing portion in the bypass flow path and discharges the cleaned cutting fluid to the pumping portion at the tip. The cutting fluid tank according to claim 2 or 3, further comprising a washing branch flow path and a flow path switching means for switching the flow of the cleaned cutting fluid to the bypass flow path or the backwash branch flow path.

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