CN104440386A - Machine tool - Google Patents
Machine tool Download PDFInfo
- Publication number
- CN104440386A CN104440386A CN201410455670.2A CN201410455670A CN104440386A CN 104440386 A CN104440386 A CN 104440386A CN 201410455670 A CN201410455670 A CN 201410455670A CN 104440386 A CN104440386 A CN 104440386A
- Authority
- CN
- China
- Prior art keywords
- workpiece
- threshold
- maintaining part
- servo motor
- axle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q15/00—Automatic control or regulation of feed movement, cutting velocity or position of tool or work
- B23Q15/20—Automatic control or regulation of feed movement, cutting velocity or position of tool or work before or after the tool acts upon the workpiece
- B23Q15/22—Control or regulation of position of tool or workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/22—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring existing or desired position of tool or work
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Numerical Control (AREA)
- Turning (AREA)
Abstract
The invention relates to a machine tool which performs positioning of a holding part which holds a workpiece. When difference between the position of a rotary table which is set at a variable P and the position of the rotary table which is detected by an encoder is smaller than a first threshold value (a position deviation of the workpiece does not exceed the first threshold value) and exceeds a second threshold which is smaller than the first threshold value, the machine tool starts a servo motor, and releases braking of a breaking part. The workpiece moves towards the position of the variable P. The machine tool can eliminate the position deviation of the workpiece without interruption in machining, and thus manufacturing efficiency can be improved and a drop of machining precision can be prevented.
Description
Technical field
The present invention relates to a kind of lathe that the maintaining part of holding workpiece is positioned.
Background technology
Workpiece is held on workbench by lathe, and carries out the processing of workpiece with the instrument being installed on main shaft.Lathe comprises main tapping, Z axis mobile device, XY shaft moving device, main shaft driving device.Main shaft support becomes can rotate by main tapping.Z axis mobile device makes main tapping move along vertical (Z-direction).Both direction (X-axis and the Y direction) motion that XY shaft moving device makes main tapping interior along the horizontal plane respectively.Main shaft driving device drive shaft rotates.
Japanese Laid-Open Patent Publication 6-161527 publication discloses a kind of lathe comprising workbench, rotating shaft, servo motor.Servo motor countershaft supply revolving force.Rotating shaft makes workpiece worktable rotary.Workpiece support becomes can rotate by workbench.Workpiece rotates around the axle parallel with the axle (such as Z axis) of regulation.By main axle moving, workpiece is rotated, can more complicated machining be carried out.
Clamping plate are installed on rotating shaft.Rotating shaft is contained in shell.Clamping plate contact shell, countershaft is braked.
When positioning workpiece, clamping plate leave shell.Control part starts servo motor.Detected value is fed back to control part by the position detector of servo motor.Thus, make workpiece movable to the position of regulation.Afterwards, control part makes servo motor stop.Clamping plate contact shell, stops the rotation of workpiece.
The processing of workpiece carries out under the state of clamping plate prevention workpiece rotation.When instrument contact workpiece, have larger power and instantaneously act on workpiece.Therefore, even if clamping plate are braked, rotating shaft also can rotate a little, causes the position of workpiece to depart from assigned position.When the bias of workpiece is larger than permissible value, alarm work, processing is interrupted.
Japanese Laid-Open Patent Publication 6-187043 publication discloses a kind of lathe comprising saddle, lead screw shaft, servo motor.Saddle is installed processing head.The nut portions of lead screw shaft and saddle screws togather.Lead screw shaft is rotated by the rotation of servo motor.Saddle slides over the guide.When servo motor rotates to target location, saddle is moved by lead screw shaft.After saddle moves, because the frictional resistance etc. of saddle and guide can cause the driving mechanisms such as lead screw shaft to produce elastic deformation.The rotating shaft of servo motor returns a little.Therefore, the back amount of control part computing servo motor, deducts back amount from above-mentioned target location, the value after deducting is reset as new target location.Servo motor stops at new target location.When not resetting the value after above-mentioned deducting, servo motor continues to rotate for eliminating back amount.Lathe prevents servo motor from rotating between withholding period, to cut down power consumption.
When carrying out multiple Drilling operation to workpiece, carry out Drilling operation, the position of workpiece will be departed from a little at every turn.Servo motor stops.Clamping plate countershaft is braked.Therefore, workpiece stops at the position of departing from.The positional offset amount of workpiece becomes large because of repeatedly Drilling operation gradually.Therefore, carrying out above-mentionedly adding man-hour, the alarm of above-mentioned lathe can work.Processing is interrupted, and manufactures efficiency and declines.When having carried out repeatedly adding man-hour (when such as having carried out Drilling operation and tapping processing etc. in the same area of workpiece) to workpiece in identical position, also same problem can be produced.The saddle of above-mentioned lathe moves towards the position different from initial target location, and therefore, machining accuracy declines.
Summary of the invention
The position that the object of the invention is to eliminate workpiece is departed from, and improves and manufactures efficiency and prevent machining accuracy from declining.
The lathe of technical scheme 1 comprises: maintaining part, servo motor, braking parts, storage part, control part, position detection part, operational part and detection unit, above-mentioned maintaining part can rotate, and the workpiece processed with instrument is kept, above-mentioned servo motor makes above-mentioned maintaining part rotate, above-mentioned braking parts is braked maintaining part, the order of maintaining part position in a rotational direction and processing work is stored by above-mentioned storage part, above-mentioned control part reads the order that storage part stores, and the driving of servo motor and the action of braking parts are controlled, above-mentioned position detection part detects maintaining part position in a rotational direction, difference between the position of the maintaining part that above-mentioned operational part computing storage part stores and the position of maintaining part detected with position detection part, above-mentioned detection unit judges whether the difference calculated with operational part is less than the first threshold preset.Servo motor stops, and braking parts is braked maintaining part.Difference between the maintaining part that operational part computing storage part stores position in a rotational direction and the position detected with position detection part, detection unit is after being judged to be that this differential ratio first threshold is little, be judged to be this differential ratio be less than the Second Threshold preset of first threshold large time, control part starts servo motor, the braking in brake off portion, the position making maintaining part move to storage part to store.
The first threshold that differential ratio between the position of the maintaining part that storage part stores and the position of maintaining part detected with position detection part presets little while not exceeding first threshold (position of workpiece depart from) and this difference exceedes the Second Threshold less than first threshold time, lathe starts servo motor, the braking in brake off portion.Before the position of workpiece is departed from and exceeded first threshold, workpiece is made to be back to stored position.Therefore, the position that lathe can eliminate workpiece is departed from, and processing can not be interrupted, and therefore, can improve and manufactures efficiency and prevent machining accuracy from declining.
After detection unit is judged to be that above-mentioned differential ratio first threshold is little, when control part has read the order of the position positioning the maintaining part stored to storage part and this differential ratio Second Threshold is large, the lathe of technical scheme 2 starts servo motor, the braking in brake off portion, the order read-out by execution.
When the position of workpiece depart from be no more than first threshold and workpiece towards the position identical with the position that storage part stores move, when the position departure ratio Second Threshold of workpiece is large, lathe started servo motor before workpiece movable, the braking in brake off portion.In existing lathe, when workpiece moves towards the position identical with the position of locating (position that storage part stores), lathe is shorten the location of omitting workpiece process time.When eliminating the location of workpiece, the position of workpiece in preceding working procedure can be remained and depart from.When workpiece moves towards the position identical with the position of locating, the present invention carries out the location of workpiece again, departs from the position of eliminating workpiece.At the position departure ratio Second Threshold hour of workpiece, the position of workpiece is departed from and is characteristic etc. because of position detector and the position produced is departed from and maybe can not be departed from the micro-locality that the machining accuracy of workpiece impacts.
Stop at servo motor, braking parts is braked maintaining part and after detection unit is judged to be that differential ratio first threshold is little, when control part reads the order different from the order positioned maintaining part and the differential ratio Second Threshold calculated with operational part is large, the control part of the lathe of technical scheme 3 starts servo motor, the braking in brake off portion, the position making maintaining part move to storage part to store.
Depart from the position of workpiece and do not exceed first threshold, lathe read be different from the order of Workpiece fixing and the position departure ratio Second Threshold of workpiece is large time, lathe starts servo motor, the braking in brake off portion.When having read the order being different from Workpiece fixing (movement directive of such as main shaft or tool changing order), lathe has positioned workpiece.Confirm in the operation of lathe outside the manufacturing procedure of workpiece and revise the position of workpiece to depart from, therefore, lathe while the order carrying out being different from Workpiece fixing, the process that the position carrying out confirming and revise workpiece is departed from.Therefore, lathe can avoid the cycle time of work pieces process elongated.
Accompanying drawing explanation
Fig. 1 is the stereogram of lathe.
Fig. 2 is the front view of lathe.
Fig. 3 is the right view of lathe.
Fig. 4 is the stereogram of the lathe eliminating the cover etc. covering guide rail.
Fig. 5 is the face side stereogram of workpiece support device.
Fig. 6 is the rear side stereogram of workpiece support device.
Fig. 7 is the vertical profile front view of turntable and C axle drive division.
Fig. 8 is the sectional view after being exaggerated piston and peripheral part thereof.
Fig. 9 is the block diagram of the structure represented near control part.
Figure 10 is the flow chart that the process departed from the position confirmed and revise workpiece is described.
Detailed description of the invention
Below, be described according to the accompanying drawing of the lathe 100 representing embodiment of the present invention.Use upper and lower, the left and right shown in the arrow in figure and front and back in the following description.Operator, at front operation lathe 100, carries out the mounting or dismounting of workpiece.Lathe 100 comprises base 10, Y-direction mobile device 20, X-direction mobile device 21, column 22, Z-direction mobile device 23, main tapping (machining spindle device) 25, workpiece support device 30 etc.Lathe 100 workpiece support device 30 supports workpiece (work piece), and with being installed on instrument 26 processing work of main tapping 25.Instrument 26 is installed on the bottom of main tapping 25 in the mode that can install and remove.Instrument 26 is changed by tool replacing apparatus (not shown).Main tapping 25 can in X direction, Y-direction and Z-direction move.Workpiece can rotate around two axles.When workpiece rotates around the axle parallel with each axle of X, Y, Z, the rotating shaft of workpiece and each axle of X, Y, Z are called A axle, B axle, C axle accordingly.Workpiece support device 30 makes workpiece rotate around A axle by the swing of pendular body 40.Workpiece is rotated around C axle by C axle drive division 60 (with reference to Fig. 5).C axle drive division 60 is fixed on pendular body 40.Base 10 comprises stand 11, main shaft base station 13, each workpiece base station 14 etc.Roughly rectangular-shaped longer in fore-and-aft direction of stand 11.Four foots 12 of height can be regulated to be located at four corners of stand 11 bottom.Stand 11 comprises base plate 11a, side plate 11b, upper plate 11c, and comprises a pair gripper shoe 11d etc. therein.Base plate 11a overlooks rectangular.Side plate 11b is connected with four limits of base plate 11a, and surrounds base plate 11a all around.Upper plate 11c overlooks rectangular dark plate-like, and its four limit is fixed in the inner peripheral surface of side plate 11b upper part.Upper plate 11c has through hole 11e at the lower position of workpiece support device 30.The chip produced in processing, cleaning fluid etc., through through hole 11e, utilize retracting device (not shown) to reclaim.Each gripper shoe 11d erects upward from base plate 11a.Each gripper shoe 11d parallel with the side plate 11b of left and right and each other left and right separate.The upper end of each gripper shoe 11d abuts with the bottom surface of upper plate 11c, supports upper plate 11c.
Roughly rectangular-shaped longer in fore-and-aft direction of main shaft base station 13, and be configured at the rear quadrate part on upper plate 11c.Main shaft base station 13 has two brace table 13a at an upper portion thereof.Each brace table 13a is longer in the longitudinal direction and parallel to each other.Each brace table 13a supporting guide 20a.About two workpiece base stations 14 are configured at the front on upper plate 11c.Each workpiece base station 14 comprises the brace table 14a of front side and the brace table 14b of rear side.Each brace table 14a, 14b are column, and surface is provided with workpiece support device 30 thereon.
Y-direction mobile device 20 comprises pair of guide rails 20a parallel to each other, multiple block 20b, Y-direction travelling carriage 20c, Y-direction CD-ROM drive motor 20d (with reference to Fig. 9).Guide rail 20a is located at the upper surface of brace table 13a.Guide rail 20a extends along the longitudinal direction.Block 20b is the mode of movement along the longitudinal direction can embed each guide rail 20a.Y-direction travelling carriage 20c is fixed on block 20b.Move along the longitudinal direction under the driving of Y-direction travelling carriage 20c CD-ROM drive motor 20d in the Y direction.X-direction mobile device 21 comprises pair of guide rails 21a parallel to each other, multiple block 21b, column platform 21c and X-direction CD-ROM drive motor 21d (with reference to Fig. 9).Guide rail 21a is located at the upper surface of Y-direction travelling carriage 20c in the empty mode opening appropriate intervals in the longitudinal direction.Guide rail 21a extends in left-right direction.Block 21b is the mode of movement in left-right direction can embed each guide rail 21a.Column platform 21c is fixed on block 21b.Column platform 21c moves in left-right direction under the driving of X-direction CD-ROM drive motor 21d.Column 22 is fixed on column platform 21c.Column 22 is moved with left and right directions respectively along the longitudinal direction by Y-direction mobile device 20 and X-direction mobile device 21.Column 22 and column platform 21c are one.Z-direction mobile device 23 comprises pair of guide rails 23a parallel to each other, multiple block 23b, main shaft caster bed 23c, Z-direction CD-ROM drive motor 23d (with reference to Fig. 9).Each guide rail 23a is located at the front surface of column 22 in the empty mode opening appropriate intervals in the lateral direction.Guide rail 23a extends along the vertical direction.Block 23b is the mode of movement along the vertical direction can embed each guide rail 23a.Main shaft caster bed 23c is fixed on the front-surface side of block 23b.Main shaft caster bed 23c moves along the vertical direction under the driving of Z-direction CD-ROM drive motor 23d.Main tapping 25 is fixed on main shaft caster bed 23c.When X-direction CD-ROM drive motor 21d, Y-direction CD-ROM drive motor 20d, Z-direction CD-ROM drive motor 23d drive, main tapping 25 carries out all around and moves up and down.It is inner that the main shaft extended along the vertical direction (not shown) is held in forward portion 25a in revolvable mode by main tapping 25.Instrument 26 is kept in the mode that can install and remove by main shaft bottom.Main shaft is connected with the Spindle Motor 25b being located at main tapping 25 upper end.When main shaft is rotated around axle center by the rotation of Spindle Motor 25b, the instrument 26 being installed on main shaft bottom rotates, and carries out machining to the workpiece being fixed on workpiece support device 30.
Workpiece support device 30 comprises gear-box 31, bearing housing 34, A axle motor 36, pendular body 40, turntable 50, C axle drive division 60 etc.Axle portion 41 on the right side of pendular body 40 is accommodated in the mode that can rotate around X-axis by gear-box 31.In the following description, the central shaft in axle portion 41 is denoted as A axle.A axle is the axle parallel with X-axis, and is the swinging axle of workpiece support device 30.A axle motor 36 is installed on the front side of gear-box 31, and gear-box 31 inside is stretched in the rotating shaft (not shown) of A axle motor 36.The rotating shaft of A axle motor 36, when Y-axis rotates, drives the gear be connected with its cephalic par.Gear is such as made up of known roller-dear axle and cam-follower, and the rotation around Y-axis is converted to the rotation around orthogonal A axle by it.Roller-dear axle is coaxially connected with the rotating shaft of A axle motor 36.Multiple cam-follower is positioned on the periphery, end in axle portion 41.Roller-dear axle has the cam engaged with cam-follower.This cam is such as globoid cam.Globoid cam does not only produce backlash in stopped process, in rotary course, also do not produce backlash.In its underpart, four corners have mount pad 31a to gear-box 31, and utilize screw etc. to be fixed on the workpiece base station 14 on right side.Axle portion 41 on the left of pendular body 40 is accommodated in the mode that can rotate around A axle by bearing housing 34.Mount pad 34a is located at the front and back of bearing housing 34 bottom.Mount pad 34a utilizes screw etc. to be fixed on the workpiece base station 14 in left side.Pendular body 40 is connected with each axle portion 41 of left and right.Pendular body 40 has substrate portion.The substantial middle fixation of C axle drive division 60 of substrate portion between each axle portion 41.Each axle portion 41 cylindrically.The axle portion 41 on right side is supported in gear-box 31 in the mode that can rotate around A axle.The axle portion 41 in left side is supported in bearing housing 34 in the mode that can rotate around A axle.Each axle portion 41 configures coaxially to each other.Pendular body 40 is configured with turntable 50 above aforesaid substrate part, and is configured with C axle drive division 60 in the below of aforesaid substrate part.C axle drive division 60 comprises shell 61, C axle motor 79, rotating shaft 80, encoder 81 etc.Shell 61 comprises main part 62, base plate 63, bearing keeper 64, upper plate 65 etc., and in bottomed cylindrical.Main part 62 cylindrically.Radiating fin is formed at the periphery of main part 62.Stator 79a is fixed on the inner circumferential of main part 62.Base plate 63 is fixed on the lower surface of main part 62.Upper plate 65 is fixed on the upper surface of main part 62 by bearing keeper 64.Base plate 63, in circular, has axis hole.Bearing 76 embeds the inner peripheral surface of base plate 63.Main part 62 is fixed in the edge, periphery of base plate 63.Bearing keeper 64 comprises the cylindrical portions of downward-extension, circular flange part.Flange part extends from the bottom of cylindrical portions towards radial outside.Bearing 75 embeds the inner side of cylindrical portions.Bearing 75,76 is inserted in rotating shaft 80.Rotating shaft 80 supports to and can rotate around C axle by bearing 75,76.C axle is the axis direction of rotating shaft 80, and is the axle parallel with Z axis.Because pendular body 40 swings, therefore C direction of principal axis is change.Turntable 50 is fixed on the upper surface of rotating shaft 80.Turntable 50 rotates around C axle together with rotating shaft 80.Rotor 79b is fixed on the outer peripheral face of the above-below direction mid portion of rotating shaft 80.C axle motor 79 is made up of stator 79a and rotor 79b.Rotor 79b is fixed on rotating shaft 80.Electric power is supplied to C axle motor 79 by power line 82, and rotor 79b and rotating shaft 80 are rotated.
Upper plate 65 is in roughly circular.Axis hole is located at the central authorities of upper plate 65.Rotating shaft 80 is through axis hole.Turntable 50 covers this axis hole.The upper surface 50a holding workpiece of turntable 50.The circular labyrinth 66 concentric with rotating shaft 80 is formed between the outer surface 65a towards turntable 50 of upper plate 65 and the lower surface relative with this outer surface 65a of turntable 50.The air Injection room 67 of the cylindrical shape concentric with rotating shaft 80 is formed at the inner side (private side of shell 61) of labyrinth 66.The wall of upper plate 65 covers the upper end of air Injection room 67.The upper end of air Injection room 67 is narrower, and is communicated with the inner side of labyrinth 66.Oil sealing 68 is configured at the bottom of air Injection room 67, and air can not leak downward.Stream 69 is formed at upper plate 65.Stream 69 runs through from the periphery wall level of the outer circumferential air Injection room 67 of upper plate 65.Compressor C, stream 69, air Injection room 67 are communicated with by the adjusting valve V1 of energy opening and closing with the gap of labyrinth 66.
Arrestment mechanism (braking parts) is located at the lower face side of upper plate 65.Upper plate 65 comprises discoid wall portion, the first cylindrical portion, flange part, the second cylindrical portion.Wall portion is in being the discoid of axis with above-below direction.The upper surface of wall portion is outer surface 65a.First cylindrical portion extends downward from the outer rim of wall portion.Flange part extends from the lower end of the first cylindrical portion towards radial outside.Second cylindrical portion extends downward from the outer rim of flange part.Rotating shaft 80 has flange 80a at the outer peripheral face of turntable 50 side end.Keep plate 70 is fixed on flange 80a with screw etc.Keep plate 70 is in the form of annular discs.Keep plate 70 has the hole passed for rotating shaft 80.Piston 71 is configured at the outer peripheral face of the cylindrical portions of bearing keeper 64.
Keep plate 70 is relative with inner surface (lower surface) 65b of upper plate 65.Piston 71 comprises cylindrical portions, circular flange part.Cylindrical portions using above-below direction as axis.Flange part is outstanding from the lower end of cylindrical portions towards radial outside.The inner peripheral surface 71a of the cylindrical portions of piston 71 is relative with the outer peripheral face 64a of the cylindrical portions of bearing keeper 64.The outer peripheral face 71c of the cylindrical portions of piston 71 is relative with the inner peripheral surface 65c of the cylindrical portion of upper plate 65.The inner peripheral surface 65c of the upper plate 65 and outer peripheral face 64a of bearing keeper 64 forms the cylinder inserted for piston 71.The upper surface 71b of the cylindrical portions of piston 71 is relative with the lower surface of keep plate 70.The outer peripheral face 71d of the flange part of piston 71 is relative with the inner peripheral surface 65d of the cylindrical portion of upper plate 65.The lower surface 71e of piston 71 is relative with the upper surface 64e of the flange part of bearing keeper 64.Braking compression chamber is formed between the upper surface 64e of the lower surface 71e of piston 71 and the flange part of bearing keeper 64.The upper surface 71f of the flange part of piston 71 is relative with the lower surface 65f of the flange part of upper plate 65.Brake release compression chamber is formed between upper surface 71f and lower surface 65f.
In order to make braking compression chamber, brake release compression chamber become closed structure, between the inner peripheral surface 71a and the outer peripheral face 64a of bearing keeper 64 of piston 71, between the outer peripheral face 71c of the piston 71 and inner peripheral surface 65c of upper plate 65, between the outer peripheral face 71d of the piston 71 and inner peripheral surface 65d of upper plate 65, D shape ring 74 is installed.Stream 72 is communicated with brake release compression chamber.Stream 72 runs through upper plate 65 from outer circumferential side.Stream 73 is communicated with braking compression chamber.Stream 73 to be accepted insurance gripping member 64 from outer circumferential side through-shaft.When valve V2 (with reference to Fig. 7) opens, the air from compressor C flows through stream 72, and to brake release, pressurize in compression chamber.When valve V3 opens, the air from compressor C flows through stream 73, and to braking, pressurize in compression chamber.Piston 71 is moved up and down by the pressurization to brake release compression chamber or braking compression chamber, carries out brake release action and braking maneuver.Valve V1 ~ V3 is the valve of electromagnetic type.
As shown in Figure 7, roughly circular substrate 77 is fixed on the bottom of rotating shaft 80.Substrate 77 is configured to the axis hole covering base plate 63, and has the opposite face relative with the lower surface of base plate 63.Sealing 78 comprises labyrinth 78a, 78b, seals the gap between the outer surface of base plate 63 and the opposite face of substrate 77.Labyrinth 78a comprises the circular raised line concentric with rotating shaft at the opposite face of substrate 77.Circular groove is formed at the lower surface of base plate 63.Raised line embeds the groove of base plate 63.Labyrinth 78b comprises the circular raised line concentric with rotating shaft at the outer surface of base plate 63.Circular groove is formed at the opposite face of substrate 77.Raised line embeds the groove of substrate 77.Encoder 81 is angle detectors of optical profile type or magnetic-type.Encoder 81 comprises detected body 81a, detecting element 81b.Detected body 81a is disc etc., is configured at rotary side.Detecting element 81b is configured at fixation side.Detecting element 81b detects detected body 81a to detect angle.Detected body 81a is fixed on the outer peripheral face of substrate 77.Substrate 77 rotates together with rotating shaft 80.Detecting element 81b is fixed on the lower surface of base plate 63.Sealing 78 such as prevents the lubricant leaked from bearing 76 from infiltrating in encoder 81.
When workpiece under the driving at C axle drive division 60 rotates, valve V3 closes, valve V2 opens, and the air from compressor C flows through stream 72, pressurizes to brake release compression chamber (space between the upper surface 71f of the lower surface 65f of the flange part of upper plate 65 and the flange part of piston 71).Depressed by piston 71 pressurization of brake release compression chamber, keep plate 70 leaves from the inner surface 65b of upper plate 65.Therefore, brake release, rotating shaft 80 becomes and can rotate.When forbidding that workpiece rotates around C axle, valve V2 closes, valve V3 opens, and the air from compressor C flows through stream 73, pressurizes to braking compression chamber (space between the upper surface 64e of the lower surface 71e of piston 71 and the flange part of bearing keeper 64).Lift on piston 71 pressurization of braking compression chamber, keep plate 70 is pressed in the inner surface 65b of upper plate 65 by the upper surface 71b of piston 71.Therefore, keep plate 70 countershaft 80 is braked.C axle drive division 60 also can be provided with the mechanism of decompressor.Now, the side in shutoff valve V2, V3, and make the stream 72 or 73 be connected with valve V2 or V3 do not closed be connected to the mechanism of decompressor.Therefore, the mechanism of decompressor can reduce pressure to uninflated brake release compression chamber or braking compression chamber, and piston 71 is moved.
Control part 90 (with reference to Fig. 9) exports control signal towards A axle motor 36 and C axle motor 79.The rotating shaft of A axle motor 36 rotates according to this control signal, and the revolving force of A axle motor is passed to the axle portion 41 in gear-box 31 by the gear be contained in gear-box 31.Therefore, pendular body 40 rotates around A axle.The workpiece that turntable 50 supports is swung by the rotation in axle portion 41.When the normal direction state upward (state such as shown in Fig. 5) of the upper surface 50a by turntable 50 is set to 0 degree, axle portion 41 can go to arbitrary angle in the scope inward turning of+90 degree to-90 degree and stop around A axle.Rotating shaft 80 is rotated by the rotation of C axle motor 79.Because turntable 50 is connected with rotating shaft 80, the workpiece that therefore turntable 50 supports can rotate around C axle.It is arbitrarily angled that workpiece can stop at around C axle.By the combination around the rotation of C axle and the swing of pendular body 40, workpiece becomes the posture of regulation.When workpiece is under the driving of C axle motor 79 during High Rotation Speed, instrument 26 pairs of workpiece carry out turnery processing.
Lathe 100 comprises control part 90.Control part 90 comprises CPU91, ROM92, RAM93 etc.ROM92 stores the control program of lathe 100.Control program is read out to RAM93 from ROM92 by CPU91, and is controlled as operating area lathe 100 by RAM93.RAM93 reads the procedure that external memory (not shown) stores.Procedure comprises multiple order, and order reads and performed by CPU91 successively.RAM93 storage of variables P, variable E, first threshold, Second Threshold.Variable P represents the position of workpiece.Specifically, variable P is the position after the location of turntable 50 is terminated.In this position, control part 90 makes piston 71 action brake turntable 50, and therefore, this position is application position.Variable E represents variable P and difference between the position of turntable 50 detected with encoder 81.Second Threshold is less than first threshold.Also the storage medium that EEPROM, EPROM, HD etc. are erasable can be used, to replace ROM92.ROM92 and RAM93 works as storage part.
Control part 90 exports control signal by output interface towards Spindle Motor 25b, X-direction CD-ROM drive motor 21d, Y-direction CD-ROM drive motor 20d, Z-direction CD-ROM drive motor 23d, A axle motor 36, C axle motor 79, valve V1, V2, V3.Lathe 100 comprises buzzer 95.Control part 90 exports control signal by output interface towards buzzer 95.Control part 90 obtains the positional information around C axle of turntable 50 from encoder 81 by input interface.Control part 90 controls according to the rotation of the positional information got from encoder 81 to C axle motor 79, makes workpiece movable to target location.The detected value of encoder 81 is carried out SERVO CONTROL as feedback information by C axle motor 79.C axle motor 79 and encoder 81 work as servo motor.Lathe 100 also can be provided with position detection part outside encoder 81, that detect the position of turntable 50.
As shown in Figure 10, the process that the position that lathe 100 carries out confirming and revise workpiece is departed from.This process is connected at power supply, initialization performs by specified period after terminating.The process reading the order of procedure is undertaken by not shown main program.Control part 90 confirms that the position of workpiece is departed from.Such as confirm to depart from around the position of C axle.In an initial condition, lathe 100 unprocessed workpiece, control part 90 countershaft 80 is braked, and C axle motor 79 is stopped, thus stops the function as servo motor.The target location determined according to procedure of turntable 50 is set in variable P by CPU91.When power supply is connected, the origin position of turntable 50 is not determined, therefore, after returning initial point process, origin position is set in variable P.CPU91 obtains the position P1 (step S1) around C axle of turntable 50 from encoder 81, the difference E (step S2) between the P1 that union obtains and variable P.Whether CPU91 is that more than first threshold judges (step S3) to difference E.When difference E is more than first threshold (step S3: yes), CPU91 exports opening signal (step S10) towards buzzer 95, ends process.When difference E is more than first threshold, the position being set in variable P is significantly departed from the position of turntable 50, therefore, opens buzzer 95, so that this situation is notified operator.In addition, when buzzer 95 is opened, turntable 50 stops.When difference E is less than first threshold (step S3: no), CPU91 judges (step S4) the positioning instruction around C the axle whether order of the procedure read is turntable 50.When the order of the procedure read is the positioning instruction around C axle of turntable 50 (step S4: yes), whether the position of CPU91 to instruction is that the position being set in variable P judges (step S5).When the position indicated is not the position being set in variable P (step S5: no), the position of instruction is set in variable P (step S6) by CPU91.CPU91 removes the braking of turntable 50 and starts C axle motor 79 (step S7).CPU91 makes turntable 50 be positioned the position (step S8) of variable P.After turntable 50 completes towards the location of position of instruction, CPU91 brakes turntable 50 and C axle motor 79 is stopped, and removes SERVO CONTROL (step S9), and makes process be back to step S1.When the order of the procedure read is not the positioning instruction around C axle of turntable 50 (step S4: no), whether the order of CPU91 to the procedure read is that other positioning instruction (positioning instruction of the X ~ Z-direction of such as main shaft) judges (step S11).When the order of the procedure read is not other positioning instruction (step S11: no), CPU91 makes process be back to step S1.When the order of the procedure read is other positioning instruction (step S11: yes), whether CPU91 is that more than Second Threshold judges (step S12) to difference E.When difference E is less than Second Threshold (step S12: no), CPU91 makes process be back to step S1.When difference E is more than Second Threshold (step S12: yes), CPU91 makes process advance to step S7.In step s 5, when the position indicated is the position being set in variable P (step S5: yes), CPU91 makes process advance to step S12.
Repeatedly add man-hour in identical position to workpiece, such as, when the same area of workpiece has carried out Drilling operation and tapping processing etc., position is departed to be increased gradually, and therefore, the possibility that alarm work, processing occur to interrupt is higher.When the position of workpiece depart from (difference E) do not exceed permissible value and larger than Second Threshold (less than permissible value), when making workpiece move towards the position identical with the position being set in variable P, lathe 100 starts servo motor, the braking in brake off portion.Because the position of workpiece towards variable P is moved, the less position therefore eliminating workpiece is departed from, and improves the machining accuracy of workpiece.Lathe 100 can prevent alarm work and processing from interrupting, thus can avoid manufacturing efficiency reduction (with reference to step S5 ~ S9, S12).
When making workpiece move towards the position identical with the position being set in variable P, omit the location of workpiece to improve manufacture efficiency.But when eliminating the location of workpiece, the position that can remain workpiece in lower preceding working procedure is departed from.Lathe 100, when making workpiece move towards the position identical with the position being set in variable P, also carries out the location of workpiece, departs from the position of eliminating workpiece.At the position departure ratio Second Threshold hour of workpiece, characteristic etc. because of position detector can be thought and the position produced is departed from and maybe can not be departed from the micro-locality that the machining accuracy of workpiece impacts.Depart from the position of workpiece and do not exceed first threshold but larger than Second Threshold, and when having read the order being different from Workpiece fixing, lathe 100 starts servo motor, removes the braking to turntable 50.Workpiece is moved towards the position of variable P.When having read the order being different from Workpiece fixing, such as, when the movement directive reading main shaft or tool changing order, lathe 100 has performed the location of workpiece.In operation outside the manufacturing procedure of workpiece, lathe 100 is carrying out the order being different from Workpiece fixing while, and the confirmation that the position of carrying out workpiece is departed from and correction, therefore, can avoid the cycle time of work pieces process elongated.
Carry out the process departed from around the position of C axle confirming and revise turntable 50 above, but also can depart from the same process of application to the position around A axle or B axle of turntable 50.
Claims (3)
1. a lathe, comprise maintaining part, servo motor, braking parts, storage part and control part, described maintaining part can rotate, and the workpiece processed with instrument is kept, described servo motor makes described maintaining part rotate, described braking parts is braked described maintaining part, the order of the application position in a rotational direction of described maintaining part when having carried out braking to described maintaining part by described braking parts and processing work is stored by described storage part, described control part reads order that described storage part stores and controls the driving of described servo motor and the action of described braking parts, it is characterized in that,
Described lathe comprises:
Position detection part, this position detection part detects described maintaining part position in a rotational direction;
Operational part, the difference between the application position of the described maintaining part that storage part stores described in this operational part computing and the position of described maintaining part detected with described position detection part;
First detection unit, this first detection unit judges whether the described difference calculated with described operational part is less than the first threshold preset; And
Second detection unit, whether this second detection unit is less than described first threshold and judge greatly than the Second Threshold preset to the described difference calculated with described operational part,
When described first detection unit is judged to be that first threshold described in described differential ratio is little and described second detection unit is judged to be that described in described differential ratio, Second Threshold is large, described control part removes the braking of described braking parts, drive described servo motor, the application position making described maintaining part be positioned described storage part to store, afterwards, by described braking parts, described maintaining part is braked, and remove the control of described servo motor.
2. lathe as claimed in claim 1, it is characterized in that, be judged to be that first threshold described in described differential ratio is little and described second detection unit is judged to be that described in described differential ratio, Second Threshold is large at described first detection unit, described control part reads the order positioned described maintaining part, and this order is when being the application position stored towards described storage part mobile, described control part removes the braking of described braking parts, drive described servo motor, the application position making described maintaining part be positioned described storage part to store, afterwards, by described braking parts, described maintaining part is braked, and remove the control of described servo motor.
3. lathe as claimed in claim 1 or 2, it is characterized in that, be judged to be that first threshold described in described differential ratio is little and described second detection unit is judged to be that described in described differential ratio, Second Threshold is large at described first detection unit, when described control part reads the order different from the order positioned described maintaining part, described control part removes the braking of described braking parts, drive described servo motor, the application position making described maintaining part be positioned described storage part to store, afterwards, by described braking parts, described maintaining part is braked, and remove the control of described servo motor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013198449A JP6303357B2 (en) | 2013-09-25 | 2013-09-25 | Machine Tools |
| JP2013-198449 | 2013-09-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104440386A true CN104440386A (en) | 2015-03-25 |
| CN104440386B CN104440386B (en) | 2017-04-12 |
Family
ID=52832580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410455670.2A Active CN104440386B (en) | 2013-09-25 | 2014-09-09 | Machine tool |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6303357B2 (en) |
| CN (1) | CN104440386B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107234485A (en) * | 2016-03-28 | 2017-10-10 | 兄弟工业株式会社 | The control method of lathe and lathe |
| CN109571101A (en) * | 2017-09-29 | 2019-04-05 | 兄弟工业株式会社 | Lathe |
| CN111716112A (en) * | 2019-03-22 | 2020-09-29 | 兄弟工业株式会社 | Numerical control device and machine tool |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6579708B2 (en) * | 2015-11-06 | 2019-09-25 | Dmg森精機株式会社 | Tool changer |
| JP6809343B2 (en) * | 2017-03-31 | 2021-01-06 | ブラザー工業株式会社 | Machine tools, machine tool control methods and computer programs |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1853856A (en) * | 2005-04-18 | 2006-11-01 | 发那科株式会社 | Machine tool |
| EP1938922A1 (en) * | 2006-12-29 | 2008-07-02 | VIGEL S.p.A. | Monitoring method and system for a tool-holding spindle |
| CN101226386A (en) * | 2006-08-09 | 2008-07-23 | 大隈株式会社 | Method for controlling parallel kinematic mechanism machine and control apparatus therefor |
| CN102640066A (en) * | 2009-12-25 | 2012-08-15 | 三菱重工业株式会社 | Control parameter adjustment method and adjustment device |
| CN103180790A (en) * | 2010-10-27 | 2013-06-26 | 株式会社牧野铣床制作所 | Numerical control method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2918732B2 (en) * | 1991-12-25 | 1999-07-12 | 株式会社牧野フライス製作所 | Monitoring method of feed axis position shift of NC machine tool |
| JPH06161527A (en) * | 1992-11-17 | 1994-06-07 | Brother Ind Ltd | Numerical controller |
| JP4193050B2 (en) * | 2003-07-16 | 2008-12-10 | 株式会社ジェイテクト | Servo drive device and control method thereof |
| JP2005222463A (en) * | 2004-02-09 | 2005-08-18 | Niigata Machine Techno Co Ltd | Operation control method and operation controller of machine tool at abnormal machining |
| JP4218054B1 (en) * | 2008-03-28 | 2009-02-04 | 株式会社ニイガタマシンテクノ | Machine tool control apparatus and method |
-
2013
- 2013-09-25 JP JP2013198449A patent/JP6303357B2/en active Active
-
2014
- 2014-09-09 CN CN201410455670.2A patent/CN104440386B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1853856A (en) * | 2005-04-18 | 2006-11-01 | 发那科株式会社 | Machine tool |
| CN101226386A (en) * | 2006-08-09 | 2008-07-23 | 大隈株式会社 | Method for controlling parallel kinematic mechanism machine and control apparatus therefor |
| EP1938922A1 (en) * | 2006-12-29 | 2008-07-02 | VIGEL S.p.A. | Monitoring method and system for a tool-holding spindle |
| CN102640066A (en) * | 2009-12-25 | 2012-08-15 | 三菱重工业株式会社 | Control parameter adjustment method and adjustment device |
| CN103180790A (en) * | 2010-10-27 | 2013-06-26 | 株式会社牧野铣床制作所 | Numerical control method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107234485A (en) * | 2016-03-28 | 2017-10-10 | 兄弟工业株式会社 | The control method of lathe and lathe |
| CN107234485B (en) * | 2016-03-28 | 2019-06-28 | 兄弟工业株式会社 | The control method of lathe and lathe |
| CN109571101A (en) * | 2017-09-29 | 2019-04-05 | 兄弟工业株式会社 | Lathe |
| CN109571101B (en) * | 2017-09-29 | 2021-02-12 | 兄弟工业株式会社 | Machine tool |
| CN111716112A (en) * | 2019-03-22 | 2020-09-29 | 兄弟工业株式会社 | Numerical control device and machine tool |
| CN111716112B (en) * | 2019-03-22 | 2022-04-12 | 兄弟工业株式会社 | Numerical control device and machine tool |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104440386B (en) | 2017-04-12 |
| JP6303357B2 (en) | 2018-04-04 |
| JP2015064763A (en) | 2015-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104440386A (en) | Machine tool | |
| US8172489B2 (en) | Machine tool, in particular for rim machining | |
| CN102791411B (en) | Gear processing machine | |
| US8882564B2 (en) | Gear grinding machine and method of dressing a grinding tool | |
| KR101114705B1 (en) | Tilt device | |
| CN107443145B (en) | Machine tool | |
| CN104785862A (en) | Gear machining device and gear machining method | |
| KR20030093119A (en) | Machining apparatus with pivotal workpiece holder | |
| JP2016137566A (en) | Gear or profile grinding machine and method for operation of the grinding machine | |
| WO2013059705A1 (en) | Systems and methods of wafer grinding | |
| CN106514290A (en) | Large-overturn-rigidity direct drive rotating table | |
| JP2011073082A (en) | Grinding machine | |
| JP6098332B2 (en) | Work support device and machine tool | |
| CN102873411B (en) | Gear machining equipment | |
| CN106272054A (en) | The grinding head device of five-shaft numerical control cutter and tool grinding machine | |
| CN106814691A (en) | Numerical control device and control method | |
| KR101485550B1 (en) | Clamping device for positioning control of machine tools equipped with rotary table | |
| CN101276776A (en) | Chuck worktable machanism | |
| CN101239441A (en) | A method and a device for effecting automatic centering of an annular workpiece on a rotating surface | |
| CN105431257A (en) | Machining centre with vertical support for long and flexible workpieces | |
| CN106272061A (en) | The clamping workpiece device of five-shaft numerical control cutter and tool grinding machine | |
| KR101609664B1 (en) | index table device for manufacturing a main bore of caliper housing | |
| JP2004082287A (en) | Rotary table device and machine tool | |
| CN105451932B (en) | Numerically-controlled machine tool with improved workbench | |
| JP4687181B2 (en) | Moving stop device for moving objects |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |