CN113001412B - Grinding fluid filtering device for grinding machine - Google Patents

Grinding fluid filtering device for grinding machine Download PDF

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Publication number
CN113001412B
CN113001412B CN202011508841.5A CN202011508841A CN113001412B CN 113001412 B CN113001412 B CN 113001412B CN 202011508841 A CN202011508841 A CN 202011508841A CN 113001412 B CN113001412 B CN 113001412B
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China
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grinding
grinding fluid
grinding machine
liquid
fluid
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CN202011508841.5A
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Chinese (zh)
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CN113001412A (en
Inventor
平田隆幸
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Noritake Co Ltd
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Noritake Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
    • B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/92—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging filtrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B01D37/04—Controlling the filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/02—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant
    • B24B55/03—Equipment for cooling the grinding surfaces, e.g. devices for feeding coolant designed as a complete equipment for feeding or clarifying coolant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Auxiliary Devices For Machine Tools (AREA)

Abstract

The invention provides a grinding fluid filter device for grinding machine, which does not need a pump for conveying grinding fluid output from a cyclone separator to the grinding machine. The grinding machine liquid feeding pump (P2) supplies the grinding liquid (F) from which the chips are removed by the magnetic separator (40) continuously removing the chips from the grinding liquid (F) discharged from the precision grinding machine (14) to the through cyclone (32) connected to the pipe, and also supplies the grinding liquid to the precision grinding machine (14) connected to the through cyclone (32). This eliminates the need for a pump as compared with a case where the grinding fluid (F) output from the output-release type normal cyclone is fed to a precision grinder or the like by using the pump.

Description

Grinding fluid filtering device for grinding machine
Technical Field
The present invention relates to a grinding fluid filter device for a grinding machine that filters and recirculates grinding fluid recovered from a grinding machine to the grinding machine, and more particularly, to a technology for supplying grinding fluid in a clean tank (english: clean tank) to a cyclone by 1 pump and simultaneously to the grinding machine.
Background
There has been proposed a grinding fluid filter device for a grinding machine, which filters a grinding fluid discharged from a grinding machine to clean the grinding fluid and supplies the grinding fluid to the grinding machine again. For example, the grinding fluid filter device for a grinding machine described in patent document 1 is such a device.
In this grinding fluid filter device for a grinding machine, the grinding fluid discharged from the grinding machine is supplied to a magnetic separator (English: magnetic separator) functioning as a filter, and the grinding fluid from which chips are magnetically removed in the magnetic separator is supplied to an annular intermediate container and temporarily stored therein. Then, the grinding fluid in the intermediate tank is purified by the cyclone separator with the output released during the pressure-feeding from the filter pump to the cleaning tank, and then stored in the cleaning tank, and the grinding fluid cooled to a predetermined temperature by the cooler provided in the cleaning tank is supplied to the grinding machine by the intermediate pump.
According to the grinding fluid filter device for a grinding machine, there is no need for a recovery tank for receiving the grinding fluid discharged from the grinding machine and a pump for conveying the grinding fluid from the recovery tank to the magnetic separator, and accordingly, there is an advantage in that the grinding fluid filter device is miniaturized.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2019-181612
Disclosure of Invention
Problems to be solved by the invention
In the grinding fluid filter device for a grinding machine, since the cyclone for purifying the grinding fluid is an output release type in which the output side is set to the atmospheric pressure, there is a problem in that a pump for feeding the grinding fluid output from the cyclone to the grinding machine or the like is required in addition to a pump for feeding the grinding fluid to the cyclone.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a grinding fluid filter device for a grinding machine, which does not require a pump for feeding grinding fluid output from a cyclone to the grinding machine or the like.
The present inventors have repeatedly conducted various studies in the background of the above-described situation, and as a result, have found the following facts: by connecting the output side of the cyclone to a pipe and connecting the output side of the cyclone to a grinding fluid supply pipe to the grinding machine, a predetermined pressure difference is formed between the input side and the output side of the cyclone so as to output the connected cyclone, and the grinding fluid is supplied from the input side of the cyclone by using a pump, the grinding fluid can be supplied to the grinding machine without using a pump on the output side of the cyclone while ensuring the cleaning function of the cyclone. The present invention has been completed based on this finding.
Means for solving the problems
That is, the gist of the present invention is (a) a grinding fluid filter device for a grinding machine that purifies a grinding fluid discharged from a grinding machine and resupplies the grinding fluid to the grinding machine, the grinding fluid filter device comprising: (b) A magnetic separator that continuously removes chips from the grinding fluid discharged from the grinding machine; and (c) a grinder liquid feeding pump for feeding the grinding liquid from which the chips are removed by the magnetic separator to the grinder through an output-connected through cyclone (english).
ADVANTAGEOUS EFFECTS OF INVENTION
According to the grinding fluid filter device for a grinding machine of the present invention, (a) a grinding fluid filter device for a grinding machine that purifies a grinding fluid discharged from a grinding machine and resupplies the grinding machine with the grinding fluid, the grinding fluid filter device for a grinding machine comprising: (b) A magnetic separator that continuously removes chips from the grinding fluid discharged from the grinding machine; and (c) a grinding machine liquid feeding pump that feeds the grinding liquid from which the chips are removed by the magnetic separator to the output-connected through cyclone and also feeds the grinding liquid to the grinding machine by the through cyclone, so that there is no need for a pump for feeding the grinding liquid output from the output-release cyclone to the grinding machine or the like, as compared with a case where the grinding liquid output from a normal output-release cyclone is fed to the grinding machine or the like by using a pump.
Here, it is preferable that (a) the grinding machine includes: a receiving pipe that receives the grinding fluid having passed through the through cyclone; and a grinding machine side electromagnetic on-off valve that opens and closes the receiving pipe in conjunction with the operation of the grinding machine, wherein (b) a filter device side electromagnetic on-off valve that opens and closes the liquid feeding pipe in conjunction with the grinding machine side electromagnetic on-off valve is provided in the liquid feeding pipe that feeds grinding liquid from the through cyclone to the receiving pipe. Accordingly, since the grinding fluid fed from the grinder fluid feed pump to the grinder through the through cyclone is stopped in conjunction with the rest of the grinder, the grinding fluid having high accuracy (degree of purification) can be immediately fed to the grinder at the start of feeding to the grinder, as compared with the case where the through cyclone is operated in a state of being deviated from the purification condition determined by the differential pressure thereof and the grinding fluid having low accuracy (degree of purification) is continuously fed. Such a configuration can provide a remarkable effect on the precision grinding machine.
In addition, it is preferable that the present invention further comprises: (a) A dirty tank (english: dirty tank) that receives the grinding fluid discharged from the grinding machine; and (b) a dirty liquid pump that delivers grinding fluid within the dirty container to the magnetic separator. In this way, compared with the case where the grinding fluid from the grinding machine is received by the magnetic separator at an unstable flow rate, the grinding fluid is fed from the dirty liquid pump so that the original chip removing capability of the magnetic separator can be exhibited regardless of the reduction in the return flow rate of the grinding fluid from the grinding machine, and the reduction in the filtering capability can be suppressed.
Further, it is preferable that (a) the dirty tank includes a stirrer having a stirring blade driven to rotate for stirring the grinding fluid in the dirty tank. This reduces heat generation of the grinding fluid, and therefore, energy is saved, and a cooler described later is also miniaturized, as compared with a case where stirring is performed by using a jet flow output from a dirty liquid pump that sends the grinding fluid from a dirty container, for example.
Further, it is preferable that (a) the grinding machine further comprises a cooling vessel for storing the grinding fluid cooled by the cooler and supplying the grinding fluid to the dirty vessel, (b) the grinding machine liquid-feeding pump continuously supplies a part of the grinding fluid from which the chips are removed by the magnetic separator to the cooling vessel, and (c) the grinding fluid in the cooling vessel flows back into the dirty vessel by gravity. Thus, even if the grinding fluid fed from the grinder fluid feed pump to the grinder through the through cyclone is stopped, for example, due to the rest of the grinder, the through cyclone is maintained in the purge condition determined by the differential pressure thereof, for example, so that the grinding fluid with high accuracy (purge degree) can be immediately fed to the grinder at the start of the feeding to the grinder. Such a configuration can provide a remarkable effect on the precision grinding machine.
In addition, it is preferable that the present invention further comprises: (a) A dirty tank that receives the grinding fluid discharged from the grinding machine; (b) A cooling container that stores the grinding fluid cooled by the cooler and supplies the grinding fluid to the dirty container; (c) A liquid feed pipe that feeds the grinding liquid output from the through cyclone to the grinding machine; (d) A 1 st return pipe branching from the liquid feed pipe and guiding a part of the grinding liquid output from the straight cyclone to the cooling vessel; and (e) a 2 nd return pipe that guides a part of the grinding fluid pumped from the grinding machine to the cooling reservoir. Thus, the 2 nd return pipe functioning as a bypass flow path is formed in parallel with the through cyclone separator and the 1 st return pipe, and therefore, by adjusting the flow rate of the 2 nd return pipe, the liquid surface of the dirt container is maintained within a predetermined range regardless of the flow rate of the grinding fluid pumped from the grinder.
Drawings
Fig. 1 is a front view illustrating a configuration of a grinding fluid filter device for a grinding machine according to an embodiment of the present invention.
Fig. 2 is a plan view of the grinding fluid filter device for the grinding machine of fig. 1.
Fig. 3 is a piping circuit diagram illustrating the flow of the grinding fluid in the grinding fluid filter device for a grinding machine of fig. 1.
Fig. 4 is a diagram for explaining a structure and an operation of a groove of the grinding fluid filter device for a grinding machine in which the grinding fluid discharged from the grinding machine is guided to the grinding fluid filter device for a grinding machine in fig. 1.
Fig. 5 is a diagram for explaining a structure of a groove of a conventional grinding fluid filter device for guiding a grinding fluid discharged from a grinding machine to the grinding machine.
Fig. 6 is a diagram showing a piping connection state of a through cyclone and a waste liquid tank (english) in the grinding fluid filter device for a grinding machine of fig. 1.
Fig. 7 is a diagram showing essential parts of the magnetic filter device in the grinding fluid filter device for a grinding machine of fig. 1.
Description of the reference numerals
10: filter equipment (grinding fluid filter for grinder)
12: output pipe
14: precision grinding machine (grinder)
15: grinder side electromagnetic opening and closing valve
17: receiving tube
18: dirty container (receiving container)
20: connecting groove
20a: bottom wall
20h: horizontal wall portion
20v: vertical wall portion
22: discharge outlet
24: receiving opening
26: step part
28: spray nozzle (English: sweeping nozzle)
30: magnetic filter
32: straight-through cyclone separator
36: cooling device
38: cooling container
40: magnetic separator
90: stirring vane
94: mixer
72: electromagnetic on-off valve for filter device
75: liquid feeding pipe 2 (liquid feeding pipe)
78: 1 st return pipe
82: 2 nd return pipe
P1: 1 st pump
P2: no. 2 pump
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the following examples, the drawings are simplified or modified as appropriate for the purpose of illustration, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily accurately drawn.
[ example ]
Fig. 1 and 2 show a front view and a plan view of a grinding fluid filter device (hereinafter referred to as a filter device) 10 for a grinding machine as an embodiment of the present invention, and fig. 3 shows a piping circuit diagram illustrating the flow of the grinding fluid in the filter device 10. In fig. 1 to 3, the grinding fluid F purified by the filter device 10 is supplied to a precision grinding machine 14 such as a continuous generation gear grinding machine, for example, via an output pipe 12 functioning as a grinding fluid supply line. The supplied grinding fluid F is supplied to a grinding point between a grinding wheel, not shown, and a workpiece, not shown, through a receiving pipe (grinding fluid receiving line) 17 having a grinding-side electromagnetic opening/closing valve 15 that is opened during grinding and closed during non-machining in conjunction with the grinding operation of the precision grinding machine 14, and a nozzle, not shown. The grinding fluid F used in the grinding process is received on the inclined receiving surface 16a of the bed (english: bed) 16. The grinding fluid F contains foreign substances such as chips (magnetic powder) that are removed from the workpiece by grinding, abrasive grains contained in the grinding wheel, and inorganic powders such as ceramic bond.
The dirty tank 18 functioning as a receiving tank of the filter apparatus 10 is connected to the base 16 via a connecting groove 20 arranged in the horizontal direction, and the dirty grinding fluid F received on the inclined receiving surface 16a of the base 16 flows back into the dirty tank 18 through the connecting groove 20 having a vertically long rectangular flow cross section. The base 16 and the dirt container 18 are provided with a discharge port 22 and a receiving port 24 which are rectangular in length, and both end surfaces of the rectangular in length of the connecting groove 20 are respectively fastened and connected to the discharge port 22 and the receiving port 24 in a fluid-tight manner.
Fig. 4 is a schematic view showing a configuration in which the dirt container 18 of the filter device 10 and the base 16 of the precision grinder 14 are connected by the connecting groove 20 in the present embodiment. As shown in fig. 4, the height AL1 of the lower side 24d of the receiving port 24 of the dirt container 18 from the floor surface FL and the height BL1 of the lower side 22d of the discharge port 22 from the floor surface FL are sufficiently lower than the height LL of the liquid surface (at maximum) of the grinding fluid F in the dirt container 18 from the floor surface FL. The height AH1 of the upper side 24u of the receiving port 24 from the floor surface FL and the height BH1 of the upper side 22u of the discharge port 22 from the floor surface FL are each set to be higher than the height LL of the liquid surface (at the time of maximum) of the grinding fluid F in the dirt container 18. Accordingly, the liquid surface in the connecting groove 20 is the same as the liquid surface in the dirty tank 18, and therefore, the chips floating on the liquid surface of the grinding fluid F are easily moved into the dirty tank 18. In addition, even if the height of the bed 16 of the precision grinding machine 14 is lower than the surface of the grinding fluid F in the dirty tank 18, the grinding fluid can be set so that no chip is retained and/or deposited, and the setting of the precision grinding machine 14 is not restricted.
A stepped portion 26 including a vertical wall portion 20v and a horizontal wall portion 20h curved in the horizontal direction from the upper end of the vertical wall portion 20v toward the discharge port 22 is formed at the end portion on the discharge port 22 side in the bottom wall 20a of the connection groove 20, and a blast nozzle 28 for suppressing the retention and/or accumulation of chips in the connection groove 20 by blasting the grinding fluid along the bottom wall 20a toward the receiving port 24 of the dirt container 18 is provided in the vertical wall portion 20 v. For example, the grinding fluid F in the dirty tank 18 output from the 1 st pump P1 functioning as a dirty liquid pump or the grinding fluid F in the clean tank 42 output from the 2 nd pump P2 functioning as a grinder liquid pump is continuously pumped to the purge nozzle 28 through a pipe not shown.
The height BL1 of the lower side 22d of the discharge port 22 is higher than the height AL1 of the lower side 24d of the receiving port 24, and is equal to the horizontal wall portion 20h of the step portion 26 formed at the bottom wall 20a of the connecting groove 20. The horizontal wall portion 20h, which is the portion of the bottom wall 20a of the connecting groove 20 closer to the discharge port 22 than the step portion 26, is horizontal, and the portion of the bottom wall 20a of the connecting groove 20 closer to the receiving port 24 than the step portion 26 is equal in height to the lower edge 24d of the receiving port 24 and is horizontal.
Conventionally, as shown in fig. 5, the lower side 124d of the receiving port 124 of the dirty container 118 is set to a height AL2 equal to or greater than the level LL of the grinding fluid F in the dirty container 118 (at the time of maximum), and in order to form an inclination that suppresses the retention and/or accumulation of chips on the bottom wall surface 120a of the connecting groove 120, the height BL2 of the lower side 122d of the discharge port 122 of the base 116 needs to be sufficiently larger than the height AL2, that is, BL2 > AL2. Therefore, since the height position of the discharge port 122 of the precision grinder 14 is required, there is a limitation on the structure of the precision grinder 14 connected to the filter device 110.
Returning to fig. 1 to 3, the filter device 10 includes: a dirty tank 18, the dirty tank 18 receiving, for example, a water-soluble grinding fluid F discharged from the bed 16 of the precision grinder 14; a magnetic filter device 30, wherein the magnetic filter device 30 is arranged on the dirt container 18 in a state of being overlapped with each other through a frame (skeleton) 11, and magnetically adsorbs and removes the chips in the grinding fluid F; a through cyclone 32, wherein the through cyclone 32 is vertically arranged above the dirt container 18, and foreign matter is removed by utilizing the centrifugal force of the swirling flow generated during the inflow of the grinding fluid F; a waste liquid tank 34, wherein the waste liquid tank 34 receives a contaminated grinding fluid F containing a large amount of foreign matters from the through cyclone 32; and a cooling container 38, wherein the cooling container 38 is provided with a cooler 36 for cooling the stored grinding fluid F. As shown in fig. 3, a partition plate 38a is fixedly provided in the cooling container 38 so that the grinding fluid F exceeding the partition plate 38a flows out from the outflow port 38b to the dirt container 18. The through cyclone 32 and the waste liquid tank 34 are arranged as shown in fig. 6, in which the peripheral pipes are laid out on the same plane.
As shown in detail in fig. 7, the magnetic filter device 30 is integrally provided with a magnetic separator 40 and a cleaning container 42. The magnetic separator 40 is constituted by a reservoir tank 44, a drum 46 rotatably supported in the reservoir tank 44 and driven to rotate by a motor 45, a guide plate 50 for guiding the grinding fluid F to a narrow space S1 between a cylindrical outer peripheral surface 48 of the drum 46 and the guide plate 50, an inflow port 52 provided in the reservoir tank 44, an outflow port 54 provided in the reservoir tank 44, a scraping plate 56 for scraping magnetic powder attached to the outer peripheral surface 48 of the drum 46 by a permanent magnet provided in the interior of the drum 46 from the outer peripheral surface 48 of the drum 46, and the like. The magnetic powder scraped by the scraping plate 56 is collected in a receiving box 58 shown in fig. 3.
A partition plate 62 for setting an overflow surface 60, which is a liquid surface of the grinding fluid F stored in the cleaning container 42, is fixedly provided in the cleaning container 42 integrally provided directly below the storage tank 44 of the magnetic separator 40, and the overflow surface 60 is set higher than the outflow port 54 of the storage tank 44. This suppresses bubbles that adhere to the chips and float the chips on the surface of the grinding fluid F stored in the cleaning container 42.
The grinding fluid F supplied from the dirt container 18 to the reservoir tank 44 of the magnetic separator 40 by the 1 st pump P1 is removed of magnetic powder while passing through the narrow space S1 between the outer peripheral surface 48 of the drum 46 of the magnetic separator 40 and the guide plate 50, and then is stored in the cleaning container 42 through the outflow port 54. The grinding fluid F stored in the cleaning vessel 42 is fed to the precision grinding machine 14 by the 1 st fluid feed pipe 68, the through-type cyclone 32, the 2 nd fluid feed pipe 75, and the output pipe 12 by the 2 nd pump P2 as shown in fig. 3, the 1 st fluid feed pipe 68 has the 1 st adjustment valve 64 and the 1 st pressure gauge 66, the base end is connected to the 2 nd pump P2 and the tip end is connected to the input side of the through-type cyclone 32, the 2 nd fluid feed pipe 75 has the 2 nd pressure gauge 70, the filter device side electromagnetic on-off valve 72, and the 2 nd adjustment valve 74 in series, and the base end is connected to the output side of the through-type cyclone 32 and the tip end is connected to the output pipe 12, and the output pipe 12 is connected to the tip end of the 2 nd fluid feed pipe 75. The 1 st trim valve 64 is manually adjusted to send a flow to the straight through cyclone 32 that is well in excess of the flow required in the precision grinder 14.
A 1 st return pipe 78 having a 3 rd regulator valve 76 is provided between the filter-device-side electromagnetic on-off valve 72 and the 2 nd regulator valve 74 of the 2 nd liquid feed pipe 75 and between the cooling vessel 38. The 2 nd and 3 rd adjusting valves 74 and 76 are manually adjusted so that the differential pressure between the input side and the output side of the through cyclone 32 is maintained at an optimum differential pressure, for example, 0.1 to 0.2MPa, when the filter-side electromagnetic opening/closing valve 72 is opened, and the flow rate of the through cyclone 32 can be maintained, whereby part or all of the grinding fluid F output from the through cyclone 32 is returned to the cooling tank 38 through the 1 st return pipe 78.
Between the 2 nd pump P2 and the cooling reservoir 38, a 2 nd return line 82 with a 4 th regulator valve 80 is provided. The flow rate of the grinding fluid F output from the 2 nd pump P2 to the through cyclone 32 is manually adjusted by the 1 st and 4 th adjusting valves 64 and 80, and a part of the grinding fluid F output from the 2 nd pump P2 is bypassed (english: bypass) to the cooling tank 38 by the 2 nd return pipe 82.
In the cleaning tank 42 of the magnetic filter device 30, the grinding fluid F overflowed beyond the partition plate 62 flows back to the dirt tank 18 by gravity through the overflow outlet 84 and the 3 rd return pipe 86 connected thereto. Accordingly, even if the output of the grinding fluid F to the precision grinder 14 is interrupted during the grinding interruption of the precision grinder 14, the grinding fluid F not fed to the precision grinder 14 by the 2 nd pump P2 is returned to the dirty tank 18, and therefore, the flow rate of the grinding fluid F fed from the 1 st pump P1 to the magnetic separator 40 is not affected, and the filtering operation by the magnetic separator 40 is continued all the time in the full operation state.
The dirt container 18 is provided with a stirrer 94 having stirring blades 90 and a motor 92 for driving the stirring blades 90 to rotate. Thus, the chips floating in the grinding fluid F flowing back from the precision grinding machine 14 are mixed into the grinding fluid F. In addition, foreign matter such as chips contained in the grinding fluid F flowing back from the precision grinding machine 14, chips (magnetic powder) removed from the workpiece by grinding, and/or broken abrasive grains from the grinding wheel, inorganic powder such as ceramic bond, etc. are suppressed from precipitating and/or accumulating in the dirt container 18. Further, in order to make manual adjustment easier by the 1 st and 4 th adjustment valves 64 and 80, a liquid level gauge 96 for detecting and displaying the liquid level of the grinding liquid F in the dirty tank 18 is provided in the dirty tank 18. As shown in fig. 1, a control box 88 for housing control components such as a switch, a relay, and a controller is disposed above the cooling container 38.
In the filter device 10 configured as described above, the grinding fluid F discharged from the precision grinder 14 is returned to the dirt container 18 and then pumped by the 1 st pump P1 to the inflow port 52 of the magnetic separator 40. In the magnetic separator 40, the grinding fluid F is removed of the magnetic powder while passing through the space S1, which is the gap between the cylindrical outer peripheral surface 48 of the drum 46 and the guide plate 50, and then flows out from the outflow port 54 of the reservoir 44 to the cleaning container 42. The grinding fluid F in the cleaning vessel 42 is pumped by the 2 nd pump P2 to the precision grinder 14 through the 1 st fluid feed pipe 68, the through cyclone 32, the 2 nd fluid feed pipe 75, and the output pipe 12, and the grinding fluid F purified by the through cyclone 32 is pumped.
The pump capacity, the 1 st adjustment valve 64, the 4 th adjustment valve 80, and the like are set so that the amount of the grinding fluid F pumped by the 1 st pump P1 is larger than the amount of the grinding fluid F pumped by the 2 nd pump P2, whereby the liquid surface of the dirty tank 18 is maintained within a predetermined range even when the grinding fluid F is supplied to the precision grinder 14. The liquid surface of the dirty tank 18 varies within a predetermined range according to the supply amount of the grinding fluid F in the precision grinder 14.
As described above, the filter device 10 of the present embodiment is a grinding fluid filter device 10 for a grinding machine that purifies a grinding fluid F discharged from a precision grinding machine 14 and resupplies the grinding fluid F to the precision grinding machine, and includes: a dirty tank 18, the dirty tank 18 receiving the grinding fluid F discharged from the precision grinder 14; a magnetic filter device 30, wherein the magnetic filter device 30 comprises a magnetic separator 40 for continuously removing chips from the grinding fluid F conveyed from the dirt container 18 by the 1 st pump P1; and a 2 nd pump P2, wherein the 2 nd pump P2 supplies the grinding fluid F from which the chips are removed by the magnetic separator 40 to the precision grinding machine 14. As a result, the grinding fluid F in the dirt container 18 can be sufficiently supplied from the 1 st pump P1 so that the original chip removing capability of the magnetic separator 40 can be exhibited irrespective of the decrease in the return flow rate of the grinding fluid F from the precision grinder 14, and the decrease in the filtering capability of the magnetic separator 40 can be suppressed. Further, since the grinding fluid F can be purified and supplied to the precision grinding machine 14 by using 2 pumps, i.e., the 1 st pump P1 and the 2 nd pump P2, the filter device 10 can be miniaturized.
In the present embodiment, the precision grinding machine 14 includes: a through cyclone 32 connected to the output, wherein the through cyclone 32 continuously purifies the grinding fluid F from which the chips are removed by the magnetic separator 40; a receiving pipe 17, wherein the receiving pipe 17 receives grinding fluid passing through the through cyclone 32; and a grinding machine side electromagnetic opening/closing valve 15, wherein the grinding machine side electromagnetic opening/closing valve 15 opens and closes the receiving pipe 17 in linkage with the operation of the precision grinding machine 14, and a filter device side electromagnetic opening/closing valve 72 that opens and closes the 2 nd liquid feeding pipe 75 in linkage with the grinding machine side electromagnetic opening/closing valve 15 is provided in the 2 nd liquid feeding pipe 75 that feeds the grinding liquid F from the through cyclone 32 to the receiving pipe 17. Accordingly, the filter-side electromagnetic on-off valve 72 is closed in conjunction with the grinding-machine-side electromagnetic on-off valve 15 that closes the valve at the time of the stop of the operation of the precision grinding machine 14, and the line on the output side of the through cyclone 32 is closed, so that it is possible to suppress the grinding fluid F that is insufficient in the filtering process due to the differential pressure between the input side and the output side of the through cyclone 32 being deviated from the predetermined value for maintaining the filtering accuracy from being fed to the precision grinding machine 14 at the time of restarting the grinding.
Further, according to the filter device 10 of the present embodiment, the dirty tank 18 is provided with the agitator 94 having the agitating blade 90 that is driven to rotate in order to agitate the grinding fluid F in the dirty tank 18. This reduces heat generation of the grinding fluid, and thus saves energy and reduces the size of the cooler 36, as compared with a case where the interior of the dirty tank is stirred by using a jet flow output from a pump that sends the grinding fluid F out of the dirty tank 18, for example.
Further, according to the filter device 10 of the present embodiment, since the cooling vessel 38 storing the grinding fluid F cooled by the cooler 36 and supplied to the dirty vessel 18 is provided, and the 2 nd pump P2 continuously supplies the grinding fluid F from which the chips have been removed by the magnetic separator 40 to the cooling vessel 38, the temperature of the grinding fluid F fed to the precision grinder 14 is set to be equal to or lower than a predetermined temperature in the cooling vessel 38 and the dirty vessel 18. In this way, in the precision grinding machine 14 requiring high-precision grinding, the temperature rise of the grinding fluid associated with the grinding and filtering operations can be suppressed, and thus high-precision grinding can be performed.
Further, the filter device 10 according to the present embodiment includes: a cooling tank 38, the cooling tank 38 storing the grinding fluid F cooled by the cooler 36 and supplying the grinding fluid F to the dirty tank 18; a 2 nd liquid feed pipe 75, the 2 nd liquid feed pipe 75 feeding the grinding liquid F output from the through cyclone 32 to the precision grinding machine 14; a 1 st return pipe 78, the 1 st return pipe 78 branching from the 2 nd feed pipe 75 and guiding a part of the grinding fluid F output from the through cyclone 32 to the cooling reservoir 38; and a 2 nd return pipe 82, wherein the 2 nd return pipe 82 guides a part of the grinding fluid F sent from the 2 nd pump P2 to the cooling reservoir 38. Therefore, the 2 nd return pipe 82 functioning as a bypass flow path is provided in parallel with the through cyclone 32, the 2 nd liquid feed pipe 75 having the filter-side electromagnetic on-off valve 72, and the 1 st return pipe 78. Accordingly, since the grinding fluid F is circulated through the cooling tank 38 in the filter device 10 irrespective of the flow rate of the grinding fluid F fed to the precision grinding machine 14, the flow rate of the 2 nd return pipe 82 is adjusted, and the liquid surface of the dirty tank 18 is maintained within the predetermined range irrespective of the flow rate of the grinding fluid F returned from the precision grinding machine 14.
In the filter device 10 of the present embodiment, the receiving port 24 of the dirt container 18 functioning as a receiving container to which one end of the connecting groove 20 is connected has a lower side lower than the liquid level LL of the dirt container 18 and an upper side higher than the liquid level LL of the dirt container 18, the discharge port 22 of the base 16 to which the other end of the connecting groove 20 is connected has a lower side lower than the liquid level LL of the dirt container 18 and an upper side higher than the liquid level LL of the dirt container 18, and the connecting groove 20 is provided with the blast nozzle 28 for blasting the grinding fluid F along the bottom wall 20a of the connecting groove 20. Therefore, even if the precision grinding machine 14 including the base 16 having the discharge port 22 formed therein with the lower side lower than the liquid surface LL of the dirt container 18 is connected to the filter device 10 via the connection groove 20, the retention of chips caused by precipitation and/or floating in the connection groove 20 can be suppressed.
In addition, according to the filter device 10 of the present embodiment, the step portion 26 formed by the vertical wall portion 20v and the horizontal wall portion 20h curved from the upper end of the vertical wall portion 20v toward the discharge port 22 is formed in the bottom wall 20a at the discharge port side end portion of the connection groove 20, and the vertical wall portion 20v is provided with the blasting nozzle 28 for blasting the grinding fluid F toward the dirt container 18 side. Accordingly, the installation space of the blast nozzle 28 is ensured below the bottom wall 20a of the connecting groove 20, and the chips deposited in the connecting groove are easily moved into the dirt container 18 by the grinding fluid F ejected from the blast nozzle 28.
In addition, according to the filter device 10 of the present embodiment, the lower side 22d of the discharge port 22 is higher than the lower side 24d of the receiving port 24 by the same height as the stepped portion 26 formed at the bottom wall 20a of the connecting groove 20. Thus, chips on the inclined receiving surface 16a of the base 16 of the precision grinder 14 are easily moved toward the stepped portion 26 formed at the bottom wall 20a of the connecting groove 20.
In the filter device 10 according to the present embodiment, the portion of the bottom wall 20a of the connecting groove 20 closer to the receiving port 24 than the step portion 26 is horizontal and has the same height as the lower edge 24d of the receiving port 24. Thus, the chips deposited in the connecting groove are easily moved from the stepped portion 26 into the dirt container 18 by the grinding fluid F ejected from the brush nozzle 28.
In the filter device 10 according to the present embodiment, the portion of the bottom wall 20a of the connecting groove 20 closer to the receiving port 24 than the step portion 26 is horizontal and has the same height as the lower edge 24d of the receiving port 24. Since the step 26 is formed at the end of the connecting groove 20 on the side of the discharge port 22, the portion of the bottom wall 20a on the side of the discharge port 22 than the step 26 is shorter than the portion of the bottom wall 20a on the side of the receiving port 24 than the step 26 and is horizontal, and therefore, chips deposited in the connecting groove can easily reach the step 26 from the discharge port 22 and then easily move toward the dirt container 18 side by the grinding fluid F ejected from the sweeping nozzle 28.
In addition, according to the filter device 10 of the present embodiment, since the 2 nd pump (grinder liquid feeding pump) P2 supplies the grinding liquid F, from which the chips are removed by the magnetic separator 40 that continuously removes the chips from the grinding liquid F discharged from the precision grinder 14, to the precision grinder 14 through the output-connection-type through cyclone 32 connected to the pipe, the pump is not required as compared with the case where the grinding liquid F output from the output-release-type normal cyclone is supplied to the precision grinder 14 or the like by the pump.
In addition, according to the filter device 10 of the present embodiment, the precision grinder 14 includes: a receiving pipe 17, wherein the receiving pipe 17 receives the grinding fluid F passing through the through cyclone 32; and a grinder-side electromagnetic on-off valve 15, wherein the grinder-side electromagnetic on-off valve 15 opens and closes the receiving pipe 17, and a filter-side electromagnetic on-off valve 72 that opens and closes the 2 nd liquid feeding pipe 75 in conjunction with the grinder-side electromagnetic on-off valve 15 is provided in the 2 nd liquid feeding pipe 75 that feeds the grinding liquid F from the through cyclone 32 to the receiving pipe 17. Accordingly, since the grinding fluid F fed from the 2 nd pump (grinder feed pump) P2 to the precision grinder 14 through the through-cyclone 32 is stopped in conjunction with the stop of the grinding process of the precision grinder 14, the grinding fluid F having a high precision (degree of purification) can be immediately fed to the precision grinder 14 at the start of the feeding of the grinding fluid F to the precision grinder 14, as compared with the case where the through-cyclone 32 is operated in a state deviated from the purification condition determined by the differential pressure thereof and the grinding fluid having a low precision (degree of purification) is continuously fed. Such a configuration can provide a remarkable effect for precision grinding by the precision grinder 14.
Further, the filter device 10 according to the present embodiment includes: a dirty tank 18, the dirty tank 18 receiving the grinding fluid F discharged from the precision grinder 14; and a 1 st pump (dirty liquid pump) P1, wherein the 1 st pump P1 sends the grinding fluid F in the dirty tank 18 to the magnetic separator. As a result, compared with the case where the flux of the grinding fluid F from the precision grinder 14 is unstable by the magnetic separator 40, the grinding fluid F is sufficiently fed from the 1 st pump P1 so that the original chip removing capability of the magnetic separator 40 can be exhibited regardless of the decrease in the return flux of the grinding fluid F from the precision grinder 14, and the decrease in the filtering capability of the magnetic separator 40 can be suppressed regardless of the operation state of the precision grinder 14.
Further, according to the filter device 10 of the present embodiment, the dirty tank 18 is provided with the agitator 94 having the agitating blade 90 that is driven to rotate in order to agitate the grinding fluid F in the dirty tank 18. As a result, for example, compared with the case of stirring by using a jet flow output from a stirring pump that feeds the grinding fluid F from the dirt container 18, the stirring pump is not required, heat generation of the grinding fluid is reduced, energy is saved, and a cooler to be described later is also miniaturized.
Further, according to the filter device 10 of the present embodiment, the cooling vessel 38 for storing the grinding fluid F cooled by the cooler 36 and supplying the grinding fluid F to the dirty vessel 18 is provided, and the 2 nd pump (grinder feed pump) P2 continuously supplies a part of the grinding fluid F from which the chips are removed by the magnetic separator 40 to the cooling vessel 38, and the grinding fluid F in the cooling vessel 38 flows back into the dirty vessel 18 by gravity. Accordingly, even if the grinding fluid F fed from the 2 nd pump P2 to the precision grinding machine 14 through the through cyclone 32 is stopped, for example, due to the stoppage of the precision grinding machine 14, the through cyclone 32 is maintained in the purge condition determined by the differential pressure thereof, for example, so that the grinding fluid F having high precision (purge degree) can be immediately fed to the precision grinding machine 14 at the start of the feeding to the precision grinding machine 14.
Further, the filter device 10 according to the present embodiment includes: a dirty tank 18, the dirty tank 18 receiving the grinding fluid F discharged from the precision grinder 14; a cooling tank 38, the cooling tank 38 storing the grinding fluid F cooled by the cooler 36 and supplying the grinding fluid F to the dirty tank 18; a 2 nd liquid feed pipe 75, the 2 nd liquid feed pipe 75 feeding the grinding liquid F output from the through cyclone 32 to the precision grinding machine 14; a 1 st return pipe 78, the 1 st return pipe 78 branching from the 2 nd feed pipe 75 and guiding a part of the grinding fluid F output from the through cyclone 32 to the cooling reservoir 38; and a 2 nd return pipe 82, wherein the 2 nd return pipe 82 guides a part of the grinding fluid F sent from the 2 nd pump P2 to the cooling reservoir 38. Thus, the 2 nd return pipe 82 functioning as a bypass flow path is formed in parallel with the through cyclone 32 and the 1 st return pipe 78, and therefore, by adjusting the flow rate of the 2 nd return pipe 82, the liquid surface of the dirt container 18 is maintained within a predetermined range regardless of the flow rate of the grinding fluid F sent from the precision grinding machine 14.
Although one embodiment of the present invention has been described in detail with reference to the drawings, the present invention is not limited to this embodiment, and may be implemented in other modes.
For example, in the foregoing embodiment, the shower nozzle 28 is provided at the vertical wall portion 20v in the step portion 26, but may be provided at the vertical wall of the connection groove 20 connected to the discharge port 22, or may be fixed to the bottom wall 20a, without the step portion 26. In short, the blasting nozzle 28 may be provided to blast the grinding fluid F along the bottom wall 20a of the connecting groove 20.
In the above-described embodiment, the return destination of the grinding fluid F by the 1 st return pipe 78 and the 2 nd return pipe 82 is the cooling reservoir 38, but one direction of the 1 st return pipe 78 and the 2 nd return pipe 82 may be returned to the dirt reservoir 18.
In the above-described embodiment, the grinding fluid F overflowed from the cleaning tank 42 is returned to the dirty tank 18, but the grinding fluid F overflowed from the cleaning tank 42 may be returned to the cooling tank 38 by disposing the cleaning tank 42 above the cooling tank 38.
In the above-described embodiment, the grinding fluid F overflowed from the cooling tank 38 is returned to the dirty tank 18, but the grinding fluid F overflowed from the cooling tank 38 may be returned to the clean tank 42 by disposing the cooling tank 38 above the clean tank 42.
In the above-described embodiment, the number of the through-type cyclone separators 32 connected between the 1 st liquid feed pipe 68 and the 2 nd liquid feed pipe 75 is 1, but a plurality of the through-type cyclone separators may be arranged in parallel or in series as required. For example, the filter elements are arranged in series when the filter accuracy is to be improved, and are arranged in parallel when the filter capacity is to be increased.
In the above-described embodiment, the filter device 10 filters and supplies the grinding fluid F to the precision grinding machine 14 such as a continuous generation gear grinding machine, for example, but may be a grinding machine of another grinding system such as a surface grinding machine.
The present invention is not limited to the above-described embodiments, and various modifications and improvements can be made thereto without departing from the spirit of the present invention.

Claims (4)

1. A grinding fluid filter device for a grinding machine, which purifies a grinding fluid discharged from a grinding machine and resupplies the grinding fluid to the grinding machine, comprising:
a magnetic separator that continuously removes chips from the grinding fluid discharged from the grinding machine;
a grinder liquid feeding pump that supplies grinding liquid from which chips are removed by the magnetic separator to the grinder through an output-connected through cyclone;
a dirty tank that receives the grinding fluid discharged from the grinding machine;
a dirty liquid pump that conveys the grinding fluid in the dirty container to the magnetic separator; a kind of electronic device with high-pressure air-conditioning system
A cooling container for storing the grinding fluid cooled by the cooler and supplying the grinding fluid to the dirt container,
the grinding machine liquid feeding pump continuously supplies a part of the grinding liquid from which the chips are removed by the magnetic separator to the cooling container,
the grinding fluid in the cooling container flows back into the dirt container by gravity.
2. A grinding fluid filter device for a grinding machine according to claim 1, characterized in that,
the grinding machine is provided with: a receiving pipe that receives the grinding fluid having passed through the through cyclone; and a grinding machine side electromagnetic opening/closing valve for opening/closing the receiving pipe in linkage with the grinding machine,
a liquid feed pipe for feeding grinding liquid from the through cyclone to the receiving pipe is provided with a filter-side electromagnetic opening/closing valve for opening/closing the liquid feed pipe in conjunction with the grinder-side electromagnetic opening/closing valve.
3. A grinding fluid filter device for a grinding machine according to claim 1, characterized in that,
the dirt container is provided with a stirrer having stirring blades which are driven to rotate in order to stir the grinding fluid in the dirt container.
4. A grinding fluid filter device for a grinding machine, which purifies a grinding fluid discharged from a grinding machine and resupplies the grinding fluid to the grinding machine, comprising:
a magnetic separator that continuously removes chips from the grinding fluid discharged from the grinding machine;
a grinder liquid feeding pump that supplies grinding liquid from which chips are removed by the magnetic separator to the grinder through an output-connected through cyclone;
a dirty tank that receives the grinding fluid discharged from the grinding machine;
a cooling container that stores the grinding fluid cooled by the cooler and supplies the grinding fluid to the dirty container;
a liquid feed pipe that feeds the grinding liquid output from the through cyclone to the grinding machine;
a 1 st return pipe branching from the liquid feed pipe and guiding a part of the grinding liquid output from the straight cyclone to the cooling vessel; a kind of electronic device with high-pressure air-conditioning system
And a 2 nd return pipe for guiding a part of the grinding fluid pumped from the grinding machine to the cooling container.
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