CN102673281A - Direct drive numerical control rotary table for engraving machine - Google Patents
Direct drive numerical control rotary table for engraving machine Download PDFInfo
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- CN102673281A CN102673281A CN201210125682XA CN201210125682A CN102673281A CN 102673281 A CN102673281 A CN 102673281A CN 201210125682X A CN201210125682X A CN 201210125682XA CN 201210125682 A CN201210125682 A CN 201210125682A CN 102673281 A CN102673281 A CN 102673281A
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Abstract
The invention relates to a numerical control rotary table for driving a workpiece or a processing device to rotate, which is suitable for an engraving machine. Due to the adoption of a direct drive stepping motor and a high subdivision stepping driver, a stepping motor rotor is directly connected with the workpiece, and no any transmission mechanism exits, so that no reverse gap and no mechanical abrasion exist; and the rotary resolution of the direct drive stepping motor is far smaller than a gap of a worm gear speed reducer and is also far smaller than the return difference of a synchronous belt reducer, so that the precision is high, and meanwhile, the tracking performance is excellent, thereby being beneficial to greatly improving the engraving fine degree and the surface quality of a handicraft, Moreover, the maintenance is free, the reliability is high, and the service life is long. The low-speed large-torque dense direct drive stepping motor provided by the invention has the advantages that when the motor is matched with the 250 subdivision stepping diver, the resolution of less than 1/1000 NM can be achieved, and the output toque can reach 50-1000 NM.
Description
Technical field: the present invention relates to a kind of numerical control rotating platform, especially a kind ofly be used to drive digital-controlled carving machine workpiece or the rotating numerical control rotating platform that directly drives of processing unit (plant), belong to technical field of engraving.
Background: digital-controlled carving machine is the nearly fast-developing during the last ten years a kind of automation cutting machines that gets up, with Metal Cutting Machine Tool similarly, rotary cutter capable of using or other instrument carry out 3 to workpiece; 4,5 processing, but different with Metal Cutting Machine Tool; Materials such as digital-controlled carving machine is mainly processed bamboo and wood, moulded, brick, greenwave, jade, aluminium, copper, cutting force is less, and processing object is main with handicraft, advertisement and identifier, furniture; Required precision is not high, but mostly finished surface is complicated embossment, to institute's processing curve quality requirement; And to process velocity, the requirement of production efficiency is also higher than Metal Cutting Machine Tool, and equipment uses on-the-spot dust pollution serious; The equipment operation does not stop more than 24 hours continuously, and operating personnel do not have mechanical equipment use experience more, so very high to the reliability requirement of equipment yet; And that the price of equipment requires is lower, and these are to the moving component of digital-controlled carving machine, particularly turn round driver part design special requirement proposed.
How existing digital-controlled carving machine drives workpiece or main shaft gyration with the driven by servomotor worm type of reduction gearing; Because of there being big gap between worm and gear, forward and reverse processing does not overlap, and institute's workpiece surface quality is relatively poor; And operation hours is long; Wearing and tearing comparatively fast make the worm and gear gap increasing in the use, and the engraving quality worse and worse.The digital-controlled carving machine that has adopts servomotor or slows down or directly slow down with synchronous toothed belt through decelerator with stepper motor and drives one or more workpiece revolutions; Transmission rigidity is very poor, and it is big to add the vibration in man-hour, and return difference is big simultaneously; Positive and negative processing does not overlap seriously; The permanent-magnet synchronous type that is useful on Metal Cutting Machine Tool directly drives numerical control rotating platform, because of its price is very expensive, can't accept for the engraving machine user.
The objective of the invention is to: a kind of driving workpiece of suitable digital-controlled carving machine or the numerical control rotating platform of main shaft gyration are provided; This numerical control rotating platform does not have the gap, does not have wearing and tearing, can guarantee the coincidence in forward and reverse engraving path for a long time; Realize the high-quality processing of engraving surface of the work, and cost is lower.
The present invention realizes goal of the invention with following technical scheme:
Engraving machine of the present invention directly drives numerical control rotating platform; Comprise turntable housing (1), direct driving motor (2), direct driving motor driver (3); One of following parts: a directly is installed on said direct driving motor (2) output shaft; Work holder (5) b, one or more identical or different processing unit (plant)s (6), processing unit (plant) (6) is 90 degree or 45 degree with the angle of numerical control rotating platform axis; C, second numerical control rotating platform, two numerical control turret axis angles are 90 degree or 45 degree;
Said numerical control rotating platform housing (1) is fixed on one of the following parts: a, and on the engraving machine lathe bed or the x of engraving machine, y; On the rectilinear motion moving component of one of z, numerical control rotating platform axis and x, y; The angle of the linear motion axis of one of z is 0 degree or 45 degree, and b is on the output shaft of second numerical control rotating platform; Two numerical control turret axis angles are 90 degree or 45 degree, and characteristics of the present invention are:
Said direct driving motor (2) is a stepper motor, and said direct driving motor driver (3) is a segmentation step actuator.Like this, between said stepping motor rotor and the workpiece, have no transmission mechanism, therefore do not have backlass, also do not have mechanical wear, its rotating accuracy is only determined by the angle of revolution of stepping motor rotor.Segment step actuator owing to adopt, be set to 256 segmentations like driver, stepper motor adopts two phases, 50 utmost point stepper motors that extensively adopt on the market; Pulse of every input, stepping motor rotor rotate 1/51200 to be changeed, and converts on the circumference of diameter 200mm; Circumferential displacement is 0.00613mm only, and such resolution ratio is much smaller than the gap of worm reducer; Also, help improving greatly the fine degree and the surface quality of handicraft engraving much smaller than the return difference of synchronous band decelerator.The stepper motor of segmentation highly, when workpiece or processing unit (plant) during at high-speed cruising, motor is under lower-speed state, to move in fact, so have tracking performance preferably.
One of shortcoming of stepper motor is a limited torque output; Maybe step-out when receiving big resistance; But make the minor diameter bamboo and wood for being mainly used in, mould, the engraving machine of aluminium, copper artware, as long as select the stepper motor of suitable moment of torsion, can satisfy reliability requirement.For the cylinder engraving machine that needs the big cutting-in of high efficiency processing large-diameter workpiece, or processing metal and require to reach degree of precision, the stepper motor on the above-mentioned market just can not meet the demands.
The present invention releases the close stepper motor that extremely directly drives of following low-speed big can satisfy above requirement, and this motor is by shell (2a), bearing (2b), stator core (2C), stator winding (2d), rotor core (2e), rotor magnetic steel (2f), armature spindle (2h), bottom (2i), formation.The rotor core number of poles is the 100-1500 utmost point, and said bearing is one of following:
A, radial-axial roller (YRT) bearing;
B, four-point-contact bearing;
C, decussation roller formula bearing;
D, opposite two angular contact bearings installing;
When stator core is two 16 grooves mutually, the rotor core number of poles is 360 utmost points and when matching with the step actuator of 250 segmentations, and this directly drives stepper motor resolution ratio is 1/1000 degree, i.e. 360,000 step/commentaries on classics, and this resolution ratio assurance 2/1000 is spent with interior high repeatable accuracy.Its moment can reach 50-1000NM according to the diameter and the length of rotor.
Two of the shortcoming of stepper motor is that the manufacturing calibration of electric machine rotor iron core and stator core magnetic pole has certain error, and in each segmentation cycle, per corresponding corner of step also is uneven; Its error can be much larger than 1/1000 degree, and this is little to handicraft processing influence, if but be used for mould or precision workpiece processing; Has high absolute fix precision with regard to the revolution that requires numerical control rotating platform; To this requirement, said stepper motor (2) should have a high-resolution encoder, and the signal of this encoder is received the encoder closed loop feedback port of said driver (3); Or receive digital control system; Realize closed-loop control, and utilize the pitch compensation function of digital control system, thereby can reach absolute fix precision near 2/1000 degree.
For the application scenario that will after workpiece or processing unit (plant) are carried out precision indexing, bear big cutting moment, should go up at stepper motor (2) braking mechanism is installed.
Said braking mechanism can be made up of brake rim (2j), hydraulic expanding cover (2k); Brake rim (2j) directly is fixed on the output shaft (2h) of stepper motor (2); Keep certain interval between brake rim under the normality (2j) and the hydraulic expanding cover (2k) and do not contact; When in hydraulic expanding cover (2k), importing hydraulic oil, hydraulic expanding cover (2k) will expand and compress brake rim (2j), realize braking;
Once process the engraving machine of N cylindrical workpiece simultaneously for needs; N the said platform that directly turns is made up of N said stepper motor (2) and N said segmentation step actuator (3); The control signal of N said segmentation step actuator is in series or in parallel with each other; Or connection in series-parallel, and an amplifier of warp (15) connects digital control system motion control signal output.
The invention advantage;
Engraving machine of the present invention directly drives numerical control rotating platform does not have backlass, and resolution ratio is high, can realize the processing of high-quality embossment, and not have wearing and tearing, the long-life, non-maintaining, highly reliable.As adopt two-phase 50 utmost point stepper motors to cooperate 250 subdivision drivers, can reach the resolution ratio of 1/50000 commentaries on classics.As adopt 360 very big moment of torsion stepper motors to cooperate 250 subdivision drivers, and can reach the resolution ratio of 1/360000 commentaries on classics or 1/1000 degree, output torque can reach 50-1000NM as required.
Description of drawings:
Fig. 1, engraving machine of the present invention directly drive numerical control rotating platform and directly drive workpiece revolution sketch map.
Fig. 2 drives the rotating engraving machine of the present invention of workpiece and directly drives numerical control rotating platform, and its housing is contained in second and directly drives sketch map on the numerical control rotating platform output shaft, two turret axis angles, 90 degree.
Fig. 3 drives the rotating engraving machine of the present invention of workpiece and directly drives numerical control rotating platform, and its housing is contained in second and directly drives sketch map on the numerical control rotating platform output shaft, two turret axis angles, 45 degree.
Directly drive numerical control rotating platform shown in Fig. 3 a, its two are directly driven the numerical control rotating platform output shaft and return the turnback sketch map.
Fig. 4, engraving machine of the present invention directly drives numerical control rotating platform and directly drives the processing unit (plant) sketch map.
Fig. 4 a, engraving machine of the present invention directly drive numerical control rotating platform and directly drive a plurality of different processing unit (plant) sketch mapes, are distributed with high speed finishing impression main shaft, tool holder, high pulling torque around axis among Fig. 4 b and open thick main shaft, laser beam emitting head.
Fig. 5 drives the rotating engraving machine of the present invention of processing unit (plant) and directly drives numerical control rotating platform, and its housing is contained in second and directly drives sketch map on the numerical control rotating platform output shaft, two turret axis angles, 90 degree.
Fig. 6 drives the rotating engraving machine of the present invention of processing unit (plant) and directly drives numerical control rotating platform, and its housing is contained in second and directly drives sketch map on the numerical control rotating platform output shaft, two turret axis angles, 45 degree.
Fig. 6 a, the rotating numerical control rotating platform output shaft that directly drives of driving processing unit (plant) shown in Figure 6 returns the turnback sketch map.
Fig. 7, the axial cutaway view of the close utmost point stepper motor of low-speed big.
Fig. 7 a, the close utmost point stepper motor of low-speed big A-A is to cutaway view.
Fig. 7 b, the close utmost point stepper motor of low-speed big A place partial enlarged drawing.
Fig. 8, most control turntable electrical connection diagrams.
Drawing reference numeral explanation: one of 1 turntable seat, 2 direct driving motors, 2a motor housing, 2b bearing, 2c stator core, 2d stator winding, 2e rotor core, 2f rotor magnetic steel, 2h armature spindle, 2g magnetic shield, 2i bottom, 2j brake rim, 2k hydraulic expanding cover, 3 segmentation step actuators, 4 workpiece, 5 work holders, 6 processing unit (plant)s, 6a high-speed electric main shaft, 6b high pulling torque main shaft, 6c tool holder, 6d laser beam emitting head, 8 engraving machine lathe beds or X, Y, Z moving component, 11 encoders, 15 amplifiers.
The specific embodiment: ginseng Fig. 1-Fig. 7; Engraving machine of the present invention directly turns platform with numerical control; Be made up of turntable shell (1), a stepper motor (2) and a segmentation step actuator (3), stepper motor (2) is the close stepper motor that extremely directly drives of low-speed big, also can adopt existing stepper motor.Said directly driving directly is equipped with one of following parts on stepper motor (2) output shaft:
A, work holder (5) is like Fig. 1, Fig. 2, Fig. 3, Fig. 3 a;
B, one or more identical or different processing unit (plant)s (6), processing unit (plant) (6) is 90 degree or 45 degree with the angle of numerical control rotating platform axis, like Fig. 4, Fig. 4 a, Fig. 4 b, Fig. 5, Fig. 6, Fig. 6 a;
C, second numerical control rotating platform, two numerical control turret axis angles are 90 degree or 45 degree, like Fig. 2, Fig. 3, Fig. 3 a, Fig. 5, Fig. 6, Fig. 6 a;
Said numerical control rotating platform housing (1) is fixed on one of the following parts:
A, the x of engraving machine lathe bed or engraving machine, y, on the rectilinear motion moving component (8) of one of z, numerical control rotating platform axis and x, y, the angle of the linear motion axis of one of z are 0 degree or 45 degree, like Fig. 1-Fig. 6 a;
B is on the output shaft of second numerical control rotating platform; Two numerical control turret axis angles are 90 degree or 45 degree, like Fig. 2, Fig. 3, Fig. 3 a, Fig. 5, Fig. 6, Fig. 6 a.
Like this, stepping motor rotor and output shaft and by between the workpiece of driving rotational or the processing unit (plant) have no transmission mechanism, therefore do not have backlass, also do not have mechanical wear, and its rotating accuracy is only determined by the angle of revolution of stepping motor rotor.Owing to having adopted the segmentation step actuator, be set to 256 segmentations like driver, stepper motor adopts two phases, 50 utmost point stepper motors that extensively adopt on the market; Pulse of every input, stepping motor rotor rotate 1/51200 to be changeed, and converts on the circumference of diameter 200mm; Circumferential displacement is 0.00613mm only, and such resolution ratio is much smaller than the gap of worm reducer; Also, help improving greatly and improving for a long time the fine degree and the surface quality of handicraft engraving much smaller than the return difference of synchronous band decelerator.Owing to adopt highly segmentation, when workpiece during at high-speed cruising, motor is under lower-speed state, to move in fact, so have tracking performance preferably.
One of shortcoming of stepper motor is a limited torque output, maybe step-out when receiving big resistance, mainly be applicable to make the minor diameter bamboo and wood, mould, the engraving machine of aluminium, copper artware, as long as select the stepper motor of suitable moment of torsion, can satisfy reliability requirement.
For the cylinder engraving machine that needs the big cutting-in processing of high efficiency large-diameter workpiece; Or processing metal also requires to reach degree of precision; Existing stepper motor just can not meet the demands on the market; Fig. 7 is the close stepper motor that extremely directly drives of a kind of low-speed big of the present invention, and this motor is by shell (2a), bearing (2b), stator core (2C), stator winding (2d), rotor core (2e), rotor magnetic steel (2f), armature spindle (2h), magnetic shield (2g), bottom (2i), formation.The rotor core number of poles is the 100-1500 utmost point, and said bearing is one of following:
A, radial-axial roller (YRT) bearing;
B, four-point-contact bearing;
C, decussation roller formula bearing;
D, opposite two angular contact bearings installing;
When stator core is two 16 grooves mutually, the rotor core number of poles is 360 utmost points and when matching with the step actuator of 250 segmentations, and this directly drives stepper motor resolution ratio is 1/1000 degree, i.e. 360,000 step/commentaries on classics, and this resolution ratio can guarantee the 2/1000 high repeatable accuracy spent.Its moment can reach 50-1000NM according to the diameter and the length of rotor.
Two of the shortcoming of stepper motor is that the manufacturing calibration of electric machine rotor iron core and stator core has certain error, and in each segmentation cycle, per corresponding corner of step also is uneven; Its error can be much larger than 1/1000 degree; This is little to handicraft processing influence, if but be used for mould or precision workpiece processing, require the revolution of numerical control rotating platform to have high absolute fix precision; Above-mentioned stepper motor (2) should have a high-resolution encoder (11); The signal of this encoder is received the encoder closed loop feedback port of said driver (3), or receives digital control system, realizes closed-loop control; And utilize the pitch compensation function of digital control system, thereby can reach absolute fix precision near 2/1000 degree.
For the application scenario that will after workpiece or processing unit (plant) are carried out precision indexing, bear big cutting moment, should go up at stepper motor (2) braking mechanism is installed.
Said braking mechanism can be made up of brake rim (2j), hydraulic expanding cover (2k); Brake rim (2j) directly is fixed on the output shaft (2h) of stepper motor (2); Newspaper is held certain interval and is not contacted between brake rim under the normality (2j) and the hydraulic expanding cover (2k); When in hydraulic expanding cover (2k), importing hydraulic oil, hydraulic expanding cover (2k) will expand and compress brake rim (2j), realize braking;
Said processing unit (plant) (6) is one of following: a, high-speed main spindle; B, laser beam emitting head; C, flame cutting head; D, the plasma cutting head; E, water jet cutter; F, electronic or Pneumatic immpacting is carved; G, electronic or pneumatic slotting head; H, lathe tool; I, line carver.
Once process the cylinder engraving machine of N workpiece simultaneously for needs; N said numerical control rotating platform is by N said work holder (5); N said stepper motor (2) and N said segmentation step actuator (3) constitute; In series or in parallel with each other or the connection in series-parallel of control signal of N said segmentation step actuator directly or through an amplifier (15) connects digital control system motion control signal output.
Claims (6)
1. an engraving machine directly drives numerical control rotating platform, comprises housing (1), direct driving motor (2), direct driving motor driver (3), and one of following parts directly are installed on said direct driving motor (2) output shaft:
A, work holder (5);
B, one or more identical or different processing unit (plant)s (6), processing unit (plant) (6) is 90 degree or 45 degree with the angle of numerical control rotating platform axis;
C, second numerical control rotating platform, two numerical control turret axis angles are 90 degree or 45 degree;
Said numerical control rotating platform housing (1) is fixed on one of the following parts:
A, the x of engraving machine lathe bed or engraving machine, y, on the rectilinear motion moving component (8) of one of z, numerical control rotating platform axis and x, y, the angle of the linear motion axis of one of z are 0 degree or 45 degree
B is on the output shaft of second numerical control rotating platform; Two numerical control turret axis angles are 90 degree or 45 degree,
It is characterized in that: said direct driving motor (2) is a stepper motor, and said direct driving motor driver (3) is the segmentation step actuator.
2. directly drive numerical control rotating platform by the said engraving machine of claim 1; It is characterized in that: said stepper motor is the close utmost point stepper motor of low-speed big; By shell (2a), bearing (2b), stator core (2C), stator winding (2d), rotor core (2e), rotor magnetic steel (2f), armature spindle (2h), bottom (2i), constitute, said bearing is one of following:
A, radial-axial roller (YRT) bearing;
B, four-point-contact bearing;
C, decussation roller formula bearing;
D, opposite two angular contact bearings installing.
3. directly drive numerical control rotating platform by the said engraving machine of claim 1, it is characterized in that: said stepper motor has encoder (11).
4. directly drive numerical control rotating platform by the said engraving machine of claim 1, it is characterized in that: said stepper motor has braking mechanism, and it is made up of brake rim (2j), hydraulic expanding cover (2k).
5. directly drive numerical control rotating platform by the said engraving machine of claim 1, it is characterized in that: said processing unit (plant) (6) is one of following: a, high-speed main spindle; B, laser beam emitting head; C, flame cutting head; D, the plasma cutting head; E, water jet cutter; F, electronic or Pneumatic immpacting is carved; G, the slotting cutter; H, lathe tool; I, line carver.
6. directly drive numerical control rotating platform by the said engraving machine of claim 1; It is characterized in that: N said numerical control rotating platform is made up of N said stepper motor (2) and N said segmentation step actuator (3), and is direct or connect digital control system motion control signal output through amplifier (15) after the in series or in parallel with each other or connection in series-parallel of the control signal of N said segmentation step actuator.
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| CN201210125682XA CN102673281A (en) | 2012-04-19 | 2012-04-19 | Direct drive numerical control rotary table for engraving machine |
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| CN201210125682XA CN102673281A (en) | 2012-04-19 | 2012-04-19 | Direct drive numerical control rotary table for engraving machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105500090A (en) * | 2016-01-22 | 2016-04-20 | 朱光波 | Mechanical device with high-torsion plate |
| CN107294280A (en) * | 2017-05-23 | 2017-10-24 | 湖北富升智能装备股份有限公司 | A kind of three axles directly turn platform |
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| CN201346705Y (en) * | 2009-01-24 | 2009-11-18 | 苏州江南电梯(集团)有限公司 | Direct-drive double shaft precision rotary table |
| CN202573579U (en) * | 2012-04-19 | 2012-12-05 | 邵文远 | Carving machine straight drive numerical control (NC) rotary table |
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2012
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN87211543U (en) * | 1987-08-07 | 1988-02-03 | 北京电加工机床厂 | Spindle feed attachment of electric spark machine |
| CN1185682A (en) * | 1996-12-20 | 1998-06-24 | 多摩川精机株式会社 | compounded step-by-step motor |
| US20020008343A1 (en) * | 2000-05-25 | 2002-01-24 | Opticlip Ltd. | Devices for exactly positioning a workpiece and a tool machining the workpiece |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105500090A (en) * | 2016-01-22 | 2016-04-20 | 朱光波 | Mechanical device with high-torsion plate |
| CN107294280A (en) * | 2017-05-23 | 2017-10-24 | 湖北富升智能装备股份有限公司 | A kind of three axles directly turn platform |
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Application publication date: 20120919 |