CN101549466A

CN101549466A - Machine tool

Info

Publication number: CN101549466A
Application number: CNA2009101332681A
Authority: CN
Inventors: 子安隆幸
Original assignee: Brother Industries Ltd
Current assignee: Brother Industries Ltd
Priority date: 2008-03-31
Filing date: 2009-03-31
Publication date: 2009-10-07
Anticipated expiration: 2029-03-31
Also published as: TWI371336B; KR101053720B1; JP2009241186A; TW200948529A; CN101549466B; KR20090104709A

Abstract

A machine tool stores the time for determining the clogging status of the filter. A control device performs tool replacement to the tool replacement device for a longer time only if the pass time is long from the stored time of the time storing section. A pressure difference detecting sensor accurately detects the fore-and-after pressure difference of the filter in the longer replacement time. A judgement section accurately determines the clogging of the filter based on the exact pressure difference detected by the pressure difference detecting sensor. The longer replacement action of the tool replacement device is performed only after a preset-time is passed after the last clogging judgement has been performed. The production efficiency of the machine tool is scarcely declined.

Description

Lathe

Technical field

The present invention relates to a kind of lathe, this lathe comprises: change the tool replacing apparatus of instrument and cleaning device that instrument that this tool replacing apparatus is changed cleans between holding tools portion and main shaft.

Background technology

Machining center (Machining Centre) is a lathe of carrying out multiple processing such as Milling Process, boring processing, tapping processing by automatic tool exchange.Machining center comprises: holding tools portion and tool replacing apparatus.Multiple instrument has been taken in by holding tools portion, with the regulation order they is sent towards changing the position.Tool replacing apparatus is being changed the instrument that reception is sent by holding tools portion on the position.The instrument that the tool replacing apparatus carrying is received is installed in it on main shaft.Simultaneously, tool replacing apparatus is pulled down the instrument that uses from main shaft.Tool replacing apparatus is carried the instrument of pulling down towards changing the position, it is returned holding tools portion.

Instrument remains on the tool retainer.Instrument is installed on the main shaft by tool retainer.Tool retainer comprises: conical blind rivet portion and the shank that is arranged on the front end of this blind rivet portion.Blind rivet portion comes orientation tool by being embedded in the bellmouth of being located at main shaft.The buckle of the snap device of shank by being arranged on the main shaft inboard prevents that instrument from coming off.

Have at the periphery of the main shaft of erecting tools and to add the smear metal that produce man-hour.On the instrument that smear metal is changed attached to tool replacing apparatus sometimes.Smear metal can be present in this blind rivet portion and is arranged between the bellmouth on the main shaft when being attached to the blind rivet portion of tool retainer.The existence of smear metal can produce the obstruction instrument the location, make more problems such as main shaft and tool retainer be impaired.

The lathe of putting down in writing in 2000 No. 52185 communique of day disclosure special permission communique has the tool cleaning device with the action interlock of tool replacing apparatus.Tool cleaning device has the washer jet that is configured near the annular of main shaft.Tool cleaning device cleans the instrument before being installed on the main shaft from washer jet jet cleaning liquid.Instrument can be installed on the main shaft under the state of having removed smear metal.Tool cleaning device can be eliminated the problems referred to above that exist smear metal to produce because of between tool retainer and the main shaft.

Washer jet is connected with the closed circuit of the cooling fluid (Coolant) that the Chao Jia Ministry of worker supplies with.Tool cleaning device can be realized purpose with simple structure by using as cleaning fluid in the cooling fluid of the internal flow of closed circuit.Add the cooling fluid of using man-hour and generally after use, reclaim, and after returning closed circuit, re-use.The cooling fluid of retrieving contains foreign matters such as smear metal, dust.Tool cleaning device has the filter that is configured in the washer jet upstream side.Filter separates the foreign matter in the cooling fluid, remove, and clean cooling fluid (cleaning fluid) is supplied with towards washer jet.

The filter that is configured in the washer jet upstream side stops up because of cleaning repeatedly slowly.Plugged sereen causes bigger resistance can for the cooling fluid that flows through this filter.Washer jet becomes and be difficult to spray cooling water, and it is not enough that cooling water becomes, and existence is the problem of cleaning means and tool retainer fully.

The lathe of putting down in writing in 2004 No. 74380 communique of day disclosure special permission communique has differential pressure switch, and this differential pressure switch detects the pressure differential of the front and back of the filter on the closed circuit that is arranged on cooling fluid.Resistance when the pressure differential that differential pressure switch detects flows through filter with cooling fluid is corresponding.Therefore, can detect the obstruction of filter according to the testing result of differential pressure switch.

The detection method of the obstruction of above-mentioned filter can be applicable to the obstruction of the filter that is configured in the washer jet upstream side is detected.Generally speaking, after giving the tool changing instruction, the action meeting of tool replacing apparatus was finished in the short actuation time about the hundreds of millisecond.The detection of the pressure differential of the front and back of filter, need with the cleaning action of the synchronous cleaning device of tool replacing apparatus in wait for that pressure differential is stable and implement again.Therefore, the detection of the obstruction of the filter that carries out according to the pressure differential of the front and back of filter can't be implemented in the actuation time of tool replacing apparatus.

When detecting plugged filter, tool replacing apparatus need prolong original actuation time and move.The production efficiency of lathe is because of decline to a great extent the actuation time of carrying out tool changing and all will prolong tool replacing apparatus at every turn.

Summary of the invention

The objective of the invention is to, in lathe, can under the situation that production efficiency is descended, detect the obstruction that is arranged on the filter on the cleaning device reliably.

The lathe of technical scheme 1, comprise: at the tool replacing apparatus of changing instrument between holding tools portion and the main shaft device, come the cleaning device that the instrument that is installed on this main shaft device is cleaned and be configured in filter on the loop of supplying with cleaning fluid towards described washer jet from being arranged on washer jet jet cleaning liquid on the described main shaft device, described lathe comprises: the differential pressure pick-up of pressure differential that detects the front and back of described filter; Read in by the detected pressure differential of this differential pressure pick-up and judge the detection unit of the blocked state of described filter; Store this detection unit and implement to stop up the storage part in time in the time of judging; The elapsed time operational part in the elapsed time in the time of computing in being stored in storage part in described time when the action of described tool replacing apparatus; And than the stipulated time action of described tool replacing apparatus is carried out in the elapsed time that this elapsed time operational part calculates in the very first time, be the control device that the stipulated time action of described tool replacing apparatus is carried out in second time longer than the described very first time in the described elapsed time.

Storage part will judge that stored the time of the blocked state of filter in time.From time storage portion stores time elapsed time than the stipulated time in short-term, control device carries out tool changing in the short time (very first time).From elapsed time in time when longer than the stipulated time of storage portion stores in time, control device carries out tool changing in the time (second time) longer than the very first time.The differential pressure detecting sensor detects pressure differential accurately in second time.Detection unit is judged the obstruction of filter exactly according to the detected pressure differential accurately of differential pressure detecting sensor.The action of the tool replacing apparatus in second time is only just implemented during through the stipulated time after judging having implemented to stop up last time.Can prevent that the production efficiency of lathe from descending by the abundant prolongation stipulated time.

In the lathe of technical scheme 2, described second time is that described differential pressure detecting sensor detects the required time of described pressure differential.

Implementation tool is between the stage of replacement in second time, and differential pressure pick-up detects the pressure differential of the front and back of filter exactly.Detection unit is judged the obstruction of filter exactly according to the pressure differential of reading in.

In the lathe of technical scheme 3, described control device is carried out the action of the described tool replacing apparatus in described second time by suspending described tool replacing apparatus.

Tool replacing apparatus is by suspending the action that is implemented in than in second time of very first time length in the way of action.Differential pressure pick-up detects pressure differential exactly under the situation of the responsiveness that does not change tool replacing apparatus.Detection unit is judged the obstruction of filter exactly according to the pressure differential of reading in.

Description of drawings

Fig. 1 is the front view of machining center.

Fig. 2 is the stereogram of the machine body of machining center.

Fig. 3 is the front view of the periphery of spindle nose and tool replacing apparatus.

Fig. 4 is the vertical view from the periphery of beneath tool replacing apparatus.

Fig. 5 is the block diagram of numerical control device.

Fig. 6 is a structure chart of supplying with the loop of cooling fluid towards cleaning device.

Fig. 7 is the flow chart of the step of the control carried out when being illustrated in the replacing instrument.

Fig. 8 is the flow chart of the step of the control carried out when being illustrated in the replacing instrument.

The specific embodiment

Accompanying drawing below with reference to the expression preferred forms describes the present invention in detail.

As shown in Figure 1, machining center 1 (lathe of the present invention) comprising: the base station 2 of cast iron and the protection baffle plate 4 that covers the top of this base station 2.The outside that protection baffle plate 4 will be arranged on the machine body 3 (with reference to Fig. 2) on the base station 2 surrounds.

As shown in Figure 1 and Figure 2, base station 2 is the long rectangular-shaped casting product of Y direction (fore-and-aft direction).Base station 2 is arranged on the floor by the 2a of foot, and the 2a of foot is arranged on four corners of bottom.The adjustable height of the 2a of foot.The height of the 2a of foot is regulated for the upper surface with the workbench 10 (with reference to Fig. 2) of machine body 3 is held in level and is implemented.

As shown in Figure 1, protection baffle plate 4 is chests of cuboid.On the front surface of protection baffle plate 4, but two

fan door

5,6 freely openable

ground configurations.Door

5,6 can be along the left and right

directions slippage.Door

5,6 comprises: windowpane 5a, 6a and handle 5b, 6b.The operator makes

door

5,6 slippages open and close the front surface of protection baffle plate 4 by grabbing handle 5b, 6b.The operator opens

door

5,6, installs and removes workpiece on the workbench 10 of machine body 3.Workpiece on the workbench 10 is processed under

door

5,6 pent states.The operator can see through the windowpane 5a that is arranged on the

door

5,6, the machining state that 6a confirms workpiece.

The guidance panel 80 that machining center 1 is operated is arranged on the right side front surface of protection baffle plate 4.Guidance panel 80 comprises: operating portion 81 and display part 82.Operating portion 81 is the keyboards with the numerical key of setting various numerical value and using, operated key of the various operation usefulness of indication etc.Display part 82 is the displays in the content of operation of screen displayed operating portion 81, running status etc.The operator is by while the demonstration operating operation portion 81 of seeing display part 82, specify workpiece procedure, need the kind of the instrument 26 (with reference to Fig. 3) that uses etc.

As shown in Figure 5, the operating portion 81 of guidance panel 80 is connected with the input interface 54 of numerical control device 50.Numerical control device 50 is the microcomputers that comprise CPU51, ROM52 and RAM53.The CPU51 of numerical control device 50 reads in the content of operation of operating portion 81 by input interface 54.CPU51 is with reference to the content of operation of operating portion 81, and moves according to the control program that is stored in the ROM52, thus machining center 1 controlled.

The display part 82 of guidance panel 80 drives loop 65 by display part and is connected with the output interface 55 of numerical control device 50.The CPU51 of numerical control device 50 gives display part by output interface 55 with action command and drives loop 65.Display part 82 carries out the demonstration of needs by the action that display part drives loop 65.

As shown in Figure 2, machine body 3 comprises: be arranged on workbench 10 in the upper face center portion of base station 2 and the pillar 16 that is arranged on workbench 10 rear sides.

Workbench 10 is supported on the top of base station 2 by the brace table 12 with rectangular shape.Brace table 12 has at an upper portion thereof along the X-axis of X-direction (left and right directions) extension sends guide (not shown) to.X-axis is sent guide support table 10 to, and it can be moved.By the rotation of X-axis motor 71 (with reference to Fig. 5), workbench 10 is sent guide to along X-axis and is moved up at right and left.

Base station 2 has at an upper portion thereof along the Y-axis of Y direction (fore-and-aft direction) extension sends guide (not shown) to.Brace table 12 is supported on Y-axis and sends on the guide.By the rotation of Y-axis motor 72 (with reference to Fig. 5), brace table 12 and workbench 10 are sent guide to along Y-axis and are moved up in front and back.

The top of sending guide in X-axis to is coated with lid 13,14.

Lid

13,14 is connected with side surface about workbench 10.

Lid

13,14 moves along X-direction by workbench 10 and stretches, and covers the top that Y-axis is sent guide to all the time.

The preceding upper lateral part of sending guide in Y-axis to is coated with front cover body 15.Front cover body 15 is connected with the front surface of brace table 12.Front cover body 15 moves along Y direction by brace table 12 and workbench 10 and stretches.The back upper lateral part that Y-axis is sent guide to is coated with rear cover body 15a.The leading section of rear cover body 15a is connected with the rear surface of brace table 12.The rearward end of rear cover body 15a runs through the bottom of pillar 16 and extends towards the rear.Rear cover body 15a moves and moves up in front and back along Y direction by brace table 12 and workbench 10.Front cover body 15 and rear cover body 15a cover the top that Y-axis is sent guide to all the time.

The smear metal that

lid

13,14 and front cover body 15, rear cover body 15a prevent to produce in the machining area of the workpiece on workbench 10, cooling fluid sends guide to attached to X-axis and Y-axis is sent on the guide.Workbench 10 can be sent guide to along X-axis and move swimmingly.Workbench 10 and brace table 12 can be sent guide to along Y-axis and move swimmingly.

The form that pillar 16 is upwards erect with vertical is provided with present portion 23, and this one 23 is arranged on the base station 2.Pillar 16 has in its place ahead along the Z axle of Z-direction (above-below direction) extension sends guide (not shown) to.The Z axle is sent guide to spindle nose 7 is supported.Spindle nose 7 is sent guide by the rotation of Z axle motor 73 (with reference to Fig. 5) to along the Z axle and is risen and descend.

Spindle nose 7 has the main shaft device 9 that is provided with the form outstanding towards the below.Main shaft device 9 is upper and lower to long cylindrical shape, and having with the vertical axis in inside is the main shaft 9a (with reference to Fig. 4) that the center is rotated.By drive shaft motor 8 (with reference to Fig. 2, Fig. 5), the main shaft 9a of main shaft device 9 rotation.As shown in Figure 2, Spindle Motor 8 is installed in the top of spindle nose 7.The main shaft 9a of main shaft device 9 has tool mounting hole 29 (with reference to Fig. 4) in its bottom.The shape that tool mounting hole 29 has towards the below, the diameter taper enlarges.

As shown in Figure 5, X-axis motor 71 is connected with the output interface 55 of numerical control device 50 by X-axis driving loop 61.Y-axis motor 72 drives loop 62 by Y-axis and is connected with the output interface 55 of numerical control device 50.Z axle motor 73 drives loop 63 by the Z axle and is connected with the output interface 55 of numerical control device 50.Spindle Motor 8 is connected with the output interface 55 of numerical control device 50 by main shaft drives loop 64.

The CPU51 of numerical control device 50 gives X-axis respectively with action command and drives loop 61, Y-axis driving loop 62, Z axle driving loop 63 and main shaft drives loop 64 by output interface 55.X-axis motor 71 is rotated by the action that X-axis drives loop 61.Y-axis motor 71 is rotated by the action that Y-axis drives loop 62.Z axle motor 73 is rotated by the action that the Z axle drives loop 63.Spindle Motor 8 is rotated by the action in main shaft drives loop 64.

Rear side at pillar 16 is supported with control cabinet 19.Control cabinet 19 is chests of taking in numerical control device 50.Pillar 16 is supported on the right side with tool replacing apparatus 20.Tool replacing apparatus 20 comprises: tool storage room 21 (being equivalent to holding tools portion) and replacing arm 22.

Tool storage room 21 will add the multiple instrument that uses man-hour and be taken in.Tool storage room 21 is sent the instrument of expectation according to the instruction of numerical control device 50 towards changing the position.As shown in Figure 3, tool storage room 21 is configured in the right side of spindle nose 7.The front end height of the corresponding main shaft device 9 in the replacing position of tool storage room 21 is set.Change between the front end that arm 22 is configured in the replacing position of tool storage room 21 and main shaft device 9.

Change the lower end that arm 22 is installed in the arm axle 22a that extends along the vertical direction.Changing arm 22 rotates in horizontal plane by the rotation of arm axle 22a.Replacing arm 22 moves vertically by arm axle 22a and rises and descend.As shown in Figure 4, change arm 22 and have

crawl section

22b, 22b at the front end of two arms that extend from arm axle 22a towards opposite directions.

Crawl section

22b, 22b alternately are positioned at the replacing position of the lower position and the tool storage room 21 of main shaft device 9 by the rotation of changing arm 22.Be positioned at the crawl section 22b that changes the position and grasp the instrument of being sent by tool storage room 21 26.The crawl section 22b that is positioned at the lower position of main shaft device 9 grasps the instrument 26 that is installed in tool mounting hole 29.The

instrument

26,26 that crawled 22b, 22b are grabbing leaves towards the below from tool storage room 21 and main shaft device 9 by the decline of changing arm 22.

Instrument

26,26 after leaving is reversing of position by changing arm 22 Rotate 180s °.Change arm 22 and behind Rotate 180 °, rise, thus one in the

instrument

26,26 is installed on the main shaft device 9, and make in the

instrument

26,26 another return tool storage room 21.

Tool replacing apparatus 20 is by changing the set that comprises above-mentioned decline, rotation and rising of arm 22, replacing instrument 26 between tool storage room 21 and main shaft device 9.The action of replacing arm 22 was finished in the short actuation time about the hundreds of millisecond.

As shown in Figure 3, instrument 26 remains on the tool retainer 60.Tool retainer 60 comprises: 60a of blind rivet portion and shank 60b.The 60a of blind rivet portion is the cone shape that dwindles towards front end, diameter taper.Shank 60b is the pole that is fixed on the shaft core position of the 60a of blind rivet portion front end.The crawl section 22b, the 22b that change arm 22 come gripping tool keeper 60 with 60a of blind rivet portion and shank 60b form up.The 60a of blind rivet portion is close to main shaft 9a by being embedded in the tool mounting hole 29 of being located at main shaft 9a, and tool retainer 60 and instrument 26 are positioned.Shank 60b is by the buckle of the snap device on the extension that is arranged on tool mounting hole 29 (not shown), thereby prevents that tool retainer 60 and instrument 26 from coming off.

As shown in Figure 4, main shaft device 9 has washer jet 32.Washer jet 32 with surround tool mounting hole 29 around form opening annularly.As shown in Figure 6, washer jet 32 is connected with the discharge line 79 of coolant pump 78 by detergent line 84.Coolant pump 78 is in order to be provided with towards the Workpiece supply cooling fluid of processing on workbench 10.

As shown in Figure 5, coolant pump 78 is connected with the output interface 55 of numerical control device 50 by pump driving loop 68.The CPU51 of numerical control device 50 gives pump with action command and drives loop 68 by output interface 55.Coolant pump 78 rotates by the action that pump drives loop 68.The cooling fluid of coolant pump 78 suction tank for coolant (not shown) storages is sent it towards discharge line 79.

The discharge line 79 of coolant pump 78 is bifurcated into cooling line 83 and detergent line 84.Detergent line 84 comprises: filter 85, differential pressure pick-up 86 and transfer valve 87.Filter 85 is configured in the dead ahead of the washer jet 32 of detergent line 84 ends.86 pairs of pressure differentials that produce in the front and back of filter 85 of differential pressure pick-up detect.

Transfer valve 87 is arranged on the branched portion of cooling line 83 and detergent line 84.As shown in Figure 5, transfer valve 87 is connected with the output interface 55 of numerical control device 50 by valve driving loop 88.The CPU51 of numerical control device 50 gives valve with action command and drives loop 88 by output interface 55.Transfer valve 87 carries out change action by the action in valve driving loop 88 between cool position and cleaning positions.

When transfer valve 87 was positioned at cool position, the cooling fluid that coolant pump 78 is sent flowed in cooling line 83.Cooling line 83 cools off this workpiece towards the Workpiece supply cooling fluid of just processing on workbench 10.When transfer valve 87 was positioned at cleaning positions, the cooling fluid that coolant pump 78 is sent flowed in detergent line 84 and sprays from washer jet 32.The cooling fluid of washer jet 32 ejections is cleaned instrument 26 and the tool retainer 60 that is positioned at main shaft device 9 belows in order to carry out tool changing.The foreign matters such as smear metal that filter 85 contains cooling fluid separate to be removed.Washer jet 32 will not contain the clean cooling fluid ejection of foreign matter.Instrument 26 and tool retainer 60 can obtain by the flushing of clean cooling fluid cleaning reliably.

86 pairs of differential pressure pick-ups detect in the pressure differential that the front and back of this filter 85 produce because of cleaning fluid flows through filter 85.What differential pressure pick-up 86 detected pressure differentials and filter 85 were given cleaning fluid passes through the big or small corresponding of resistance.When filter 85 stopped up because of the separated foreign matter of removing, the resistance that passes through of filter 85 increased.Differential pressure pick-up 86 detected pressure differentials are corresponding with the chocking-up degree of filter 85.

As shown in Figure 5, differential pressure pick-up 86 is connected with the input interface 54 of numerical control device 50.The CPU51 of numerical control device 50 reads in by differential pressure pick-up 86 detected differential pressure data by input interface 54.CPU51 judges the blocked state (being equivalent to detection unit) of filter 85 according to differential pressure data.

Below with reference to the flow chart of Fig. 7 and Fig. 8, the control action when numerical control device 50 is carried out tool changing describes.Si among the figure (i=1,2 ...) be the step number of the action step of expression CPU51.

The CPU51 of numerical control device 50 numbers n with program block and sets 1 (S1) for, and according to procedure, the control of beginning machining center 1.The CPU51 of numerical control device 50 reads in n number program block, interpretative order content (S2).

Whether the CPU51 of numerical control device 50 is that (S3) judged in the EP (end of program) instruction to program block.(S3 when being the EP (end of program) instruction; Be), the CPU51 finishing control action of numerical control device 50.

(S3 when not being the EP (end of program) instruction; ), whether the CPU51 of numerical control device 50 is not that (S4) judged in the tool changing instruction to the program block that reads in.(S4 when being the tool changing instruction; Be), the CPU51 of numerical control device 50 begins tool changing action (S5).

(S4 when not being the tool changing instruction; ), the CPU51 of numerical control device 50 does not carry out processing according to the program block that reads in and handles (step S19).It is that combination drives X-axis motor 71, Y-axis motor 72, Z axle motor 73 and Spindle Motor 8 that processing is handled, and the processing that the workpiece on the workbench 10 is processed.When processing work, CPU51 switches to cool position with above-mentioned transfer valve 87, and cooling fluid towards Workpiece supply, is cooled off workpiece.

After the tool changing action beginning, the CPU51 of numerical control device 50 carries out computing (S6) to elapsed time Δ t (differential pressure of t1-last time in=current time detects t0 in time).The action of the CPU51 of S6 is equivalent to the elapsed time operational part.The differential pressure detection t0 in time of last time was stored in the RAM53 when differential pressure detects in last time.RAM53 is equivalent to the storage part in time.

The CPU51 of numerical control device 50 compares (S7) with elapsed time Δ t and the setting-up time that calculates.Setting-up time pre-determines and is stored in the RAM53.Setting-up time for example is 24 hours.

At elapsed time Δ t than setting-up time (S7 in short-term; Not), the CPU51 of numerical control device 50 only carries out instrument cleaning treatment (S20).The instrument cleaning treatment is the processing that transfer valve 87 is switched to cleaning positions, also comes cleaning means 26 and tool retainer 60 with the cooling fluid of washer jet 32 ejections.The instrument cleaning treatment continues to carry out, till the tool changing release.The cleaning of instrument 26 and tool retainer 60 was finished in the short time (hundreds of millisecond) till tool replacing apparatus 20 finishes tool changing.

At elapsed time Δ t is setting-up time (S7 when above; Be), the CPU51 of numerical control device 50 picks up counting (S8) built-in timer, and stops tool changing action (S9).Built-in timer carries out timing detection time to predefined differential pressure.Differential pressure be detection time till differential pressure pick-up 86 detected pressure differentials are stable the required time.Differential pressure detection time for example is 2 seconds.

The CPU51 of numerical control device 50 carries out instrument cleaning treatment (S10).The CPU51 of numerical control device 50 continues to carry out the instrument cleaning treatment, (S11 till the timing of built-in timer finishes; Be).The cleaning of instrument 26 and tool retainer 60 continues to carry out, up to pass through the differential pressure detection time of setting (for example 2 second time) in built-in timer till.

(S11 when the timing of built-in timer finishes; Be), the CPU51 of numerical control device 50 is stored in (S12) in the RAM53 with current time as differential pressure detection t0 in time.The CPU51 of numerical control device 50 carries out differential pressure and detects processing (S14) after stopping the timing of built-in timer (S13).Differential pressure detects and handles is the processing of reading in differential pressure pick-up 86 detected differential pressure data and calculating the pressure differential of filter 85 front and back.The CPU51 of numerical control device 50 judges the blocked state (S15) of filter 85 according to the pressure differential that calculates.By carrying out the processing from step S8 to step S15, the CPU51 of numerical control device 50 carries out the calculating of pressure differential waiting for till stable through above-mentioned differential pressure detection time, differential pressure pick-up 86 detected pressure differentials.Therefore, the CPU51 of numerical control device 50 can judge the blocked state of filter 85 exactly.(S15 when being judged to be the generation obstruction; Be), the CPU51 of numerical control device 50 gives display part 82 (S16) with idsplay order.According to idsplay order, display part 82 is display filter 85 these situations of obstruction in display part 82 for example, report the operator thus.When obstruction was remarkable, the CPU51 of numerical control device 50 also can stop the action of machining center 1.The stopping of machining center 1 carried out by the driving that stops X-axis motor 71, Y-axis motor 72, Z axle motor 73 and Spindle Motor 8.Step S15 be "No" or carried out step S16 after, the CPU51 of numerical control device 50 restarts tool changing action (S17).Afterwards, the CPU51 of numerical control device 50 adds 1 (S18) on program block numbering n, step S2 is transferred in processing, repeats above-mentioned action.In S15, (S15 when being judged to be generation obstruction; ), the CPU51 of numerical control device 50 does not restart tool changing action (S17).

Carry out differential pressure and detect when handling, the replacing time of instrument 26 becomes than not carrying out differential pressure detects the long time of time (hundreds of millisecond: be equivalent to the very first time) when handling (roughly 2 second time: be equivalent to for second time).It is that setting-up time is just carried out when above that differential pressure only detect to be handled at the elapsed time Δ t that step S6 calculates.Setting-up time is sufficiently long time (for example 24 hours).Need the tool changing of second time only to carry out through under the replacing chance of setting-up time every.Other tool changing of changing under the chance was finished in the very first time (hundreds of millisecond).Therefore, cause big influence can for the production efficiency of machining center 1.Machining center 1 can detect the obstruction of the filter 85 of cleaning device reliably under the situation that production efficiency does not descend.

Below to partial alteration the variation of embodiment described above describe.

1) differential pressure detect to be handled (S14) and instrument cleaning treatment (S10) also can be implemented before the tool changing action beginning of S5, rather than enforcement after tool changing action beginning.

2) in the above-described embodiment, differential pressure detection processing and instrument cleaning treatment are implemented in the action that suspends tool replacing apparatus 20.In variation, differential pressure detects processing and the instrument cleaning treatment also can be under the situation of the action that does not suspend tool replacing apparatus 20, to carry out than common slow-footed speed (low speed).Slow speed set for tool changing is finished in differential pressure detects the required time.

By top detailed description as can be known, lathe of the present invention will judge that be stored in the storage part in time the time of the blocked state of filter.Operational part is according to the elapsed time of the computing in time of storing from the blocked state judgement of last time.Control device only just prolongs the tool changing time in the elapsed time when longer.Differential pressure pick-up detects pressure differential accurately in the long replacing time.Detection unit is accurately judged the obstruction of filter according to pressure differential accurately.The judgement of stopping up is only just being implemented when the elapsed time of the judgement of last time is longer than the stipulated time.By prolonging the stipulated time, the production efficiency that can suppress lathe descends.

Claims

1. lathe comprises:

Tool replacing apparatus, this tool replacing apparatus is the replacing instrument between holding tools portion and main shaft device;

Cleaning device, this cleaning device cleans the instrument that is installed on this main shaft device from being arranged on the washer jet jet cleaning liquid on the described main shaft device; And

Filter, this filter deployment is being supplied with towards described washer jet on the loop of cleaning fluid,

It is characterized in that, comprising:

Differential pressure pick-up, this differential pressure pick-up detects the pressure differential of the front and back of described filter;

Detection unit, this detection unit read in by the detected pressure differential of described differential pressure pick-up, judge the blocked state of described filter;

Time storage part, the described detection unit of storage portion stores in this is implemented to stop up the time of judging in time;

The elapsed time operational part, when the action of described tool replacing apparatus, the elapsed time in the time of described elapsed time operational part computing in being stored in storage part in described time; And

Control device, elapsed time that described elapsed time operational part calculates than the stipulated time in short-term, described control device carries out the action of described tool replacing apparatus in the very first time, in the described elapsed time is stipulated time when above, and described control device carries out the action of described tool replacing apparatus in second time longer than the described very first time.

2. lathe as claimed in claim 1 is characterized in that, described second time is that described differential pressure detecting sensor detects the required time of described pressure differential.

3. lathe as claimed in claim 1 or 2 is characterized in that, described control device is carried out the action of the described tool replacing apparatus in described second time by suspending described tool replacing apparatus.