CN102904399B - Rotary device, manufacturing method thereof and assembling apparatus thereof - Google Patents
Rotary device, manufacturing method thereof and assembling apparatus thereof Download PDFInfo
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- CN102904399B CN102904399B CN201210274400.2A CN201210274400A CN102904399B CN 102904399 B CN102904399 B CN 102904399B CN 201210274400 A CN201210274400 A CN 201210274400A CN 102904399 B CN102904399 B CN 102904399B
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Abstract
The invention discloses a manufacturing method of a rotary device (1). The rotary device (1) comprises a rotor (6) for carrying recording discs (8); a base (4) having a bearing hole using a rotating shaft of the rotor (6) as a center and an annular wall portion (4e) using the bearing hole as a center; a bearing unit (12) which rotatably supports the rotor with respect to the base (4)and adhesively fixed in the bearing hole (4h); a core body (40) having an annular portion (40a) and a convex pole (40b) fixed on the annular wall portion (4e); and a coil (42) wound around the convex pole (40b). The manufacturing method comprises steps of: fitting the bearing unit (12) and the bearing hole (4h) of the base (4), spreading curable resin (54) all around peripheries of the edges of the bearing unit (12) and the bearing hole (4h), respectively irradiating ultraviolet beams to a plurality of ultraviolet light irradiation regions located at different positions along a circumferential direction of existing areas with the curable resin (54).
Description
Technical field
The present invention relates to the slewings such as a kind of hard disc drive unit and manufacture method thereof and apparatus for assembling.
Background technology
The slewings such as hard disc drive unit have the demand of slimming.Such as recite in patent documentation 1 and bearing unit to be fitted together to the dead eye of pedestal and the fixing slewing that bondd.In order to make above-mentioned slewing thinner, there is the method that bearing unit is shortened relative to the chimeric distance of pedestal.
[background technology document]
[patent documentation]
[patent documentation 1] Japanese Patent Laid-Open 2011-8851 publication
But if make bearing unit shorten relative to the chimeric distance of pedestal, then the bearing unit be arranged on pedestal easily produces inclination relative to pedestal.If installation shaft bearing unit obliquely, then the gradient being positioned in the epitrochanterian record video disc supported by bearing unit becomes large.If the gradient of record video disc is comparatively large, then the read-write error of data increases.
In the manufacture method of the slewing described in patent documentation 1, it is made to harden to the hardening resin irradiation ultraviolet radiation exposed to the end face of dead eye and bearing unit.But the method is to the hardening resin exposed irradiation ultraviolet radiation in the broader context, therefore, can produce the situation that this hardening of resin is insufficient.If maintain the state that sclerosis is insufficient, then when applying inclined load to rotor in the operation manufacturing slewing, the possibility that the bearing unit of support rotor tilts uprises.If in order to promote that sclerosis makes the time of irradiation ultraviolet radiation elongated, then the activity duration is elongated, thus operating efficiency reduces.
Summary of the invention
Under above-mentioned background, recognize that problem is to provide a kind of suppression to be arranged on the inclination of the bearing unit on the pedestal of slewing, even and if slimming also can alleviate the slewing of the reduction of the installation accuracy of bearing unit.
[inventing problem to be solved]
The present invention completes in view of the foregoing, and its object is to provides a kind of slewing reducing the read-write error of data.
[technological means of dealing with problems]
In order to solve above-mentioned problem, in the manufacture method of the slewing of the first technical scheme of the present invention, this slewing comprises: rotor, for mounting record video disc; Pedestal, has the dead eye centered by the rotating shaft of above-mentioned rotor and the annular wall centered by above-mentioned dead eye; Bearing unit, rotatably supports above-mentioned rotor relative to said base, and is bonded and fixed in above-mentioned dead eye; Core body, has the annular portion and the salient pole outstanding from above-mentioned annular portion towards radial direction that are fixed on above-mentioned annular wall; And coil, coiled wire on above-mentioned salient pole and being formed.And, the principal character of the manufacture method of this slewing is to comprise the following steps: make above-mentioned bearing unit chimeric with the above-mentioned dead eye of said base, and makes hardening resin spread all over the periphery at the edge of the lower surface of above-mentioned bearing unit and the above-mentioned dead eye of said base; And in the domain of the existence to exist at above-mentioned hardening resin, the circumferential direction along this domain of the existence is positioned to multiple Ultraviolet radiation regions irradiation ultraviolet radiation light beam respectively of diverse location.
In addition, the slewing of the second technical scheme of the present invention comprises: rotor, for mounting record video disc; Pedestal, the dead eye centered by the rotating shaft of above-mentioned rotor and the annular wall centered by above-mentioned dead eye; Bearing unit, rotatably supports above-mentioned rotor relative to said base, and is bonded and fixed in above-mentioned dead eye; Core body, has the annular portion and the salient pole outstanding from above-mentioned annular portion towards radial direction that are fixed on above-mentioned annular wall; And coil, coiled wire on above-mentioned salient pole and being formed.And, the principal character of this slewing is: above-mentioned bearing unit is entrenched in the above-mentioned dead eye of said base, hardening resin is there is throughout the edge of the above-mentioned dead eye of the lower surface of above-mentioned bearing unit and said base, and in above-mentioned hardening resin, along the above-mentioned end face of above-mentioned bearing unit edge illumination ultraviolet beam and the region of hardening and UV cured portion are configured in the diverse location of circumferential direction, and be at least formed in three positions.
In addition, in the manufacture method of the slewing of the 3rd technical scheme of the present invention, this slewing comprises: rotor, for mounting record video disc; Pedestal, has the dead eye centered by the rotating shaft of above-mentioned rotor; And bearing unit, rotatably support above-mentioned rotor relative to said base, and be bonded and fixed in above-mentioned dead eye.The feature of this manufacture method is to comprise the following steps: make above-mentioned bearing unit chimeric with the above-mentioned dead eye of said base, and makes hardening resin spread all over the periphery at the edge of the lower surface of above-mentioned bearing unit and the above-mentioned dead eye of said base; And with the mode irradiation ultraviolet radiation light beam of the centre in Ultraviolet radiation region in the midway of the domain of the existence of above-mentioned hardening resin.
In addition, the apparatus for assembling of the 4th technical scheme of the present invention is the apparatus for assembling of the slewing assembling the second technical scheme of the present invention, it is characterized in that comprising: core body press section, the annular portion of above-mentioned core body is pressurizeed and the annular portion of above-mentioned core body is combined with the annular wall of said base; Coil press section, pressurizeing with the first surface of above-mentioned rotor subtend to above-mentioned coil when present dynasty's said base presses down above-mentioned core body press section; And limiting mechanism, be configured between above-mentioned core body press section and above-mentioned coil press section, in order to limit the plus-pressure that above-mentioned coil press section applies the first surface of above-mentioned coil, and this plus-pressure be limited in the scope of 3 ~ 10N.
In addition, by the combination in any of above inscape, inscape of the present invention or be expressed in phase double replacement between method, product, manufacture method etc. and person also can be effective as kenel of the present invention.
[effect of invention]
According to the present invention, due to the inclination of the bearing unit be arranged on the pedestal of slewing can be suppressed, even if so can provide a kind of and carry out slimming and also can alleviate the reduction of the installation accuracy of bearing unit and then the slewing of read-write error of data can be reduced.
Accompanying drawing explanation
Fig. 1 is the stereogram of the slewing representing embodiments of the present invention.
Fig. 2 is the A-A line profile of the slewing of Fig. 1.
Fig. 3 is the major part amplification stereogram represented the bearing unit of Fig. 2 and the step of pedestal irradiation ultraviolet radiation light beam.
Fig. 4 A is the major part amplification view represented the bearing unit of Fig. 2 and the step of pedestal irradiation ultraviolet radiation light beam, and Fig. 4 B is the B-R-B line profile of Fig. 4 A.
Fig. 5 is the major part amplification stereogram of the step represented the bearing unit of Fig. 2 and the comparative example of pedestal irradiation ultraviolet radiation light beam.
Fig. 6 A is the major part amplification view of the step represented the bearing unit of Fig. 2 and the comparative example of pedestal irradiation ultraviolet radiation light beam, and Fig. 6 B is the C-C line profile of Fig. 6 A.
Fig. 7 A ~ 7C represents the major part amplification profile core body of the coil with Fig. 2 being fixed on the step on pedestal.
Fig. 8 is the curve chart of the inclination of the rotor representing the slewing utilizing the manufacture method of embodiments of the present invention to manufacture.
[explanation of symbol]
Embodiment
Below, based on preferably execution mode and with reference to graphic, the present invention will be described.To each graphic shown same or equal inscape, component mark prosign, and suitably the repetitive description thereof will be omitted.In addition, in order to easy understand, each graphic in the size of component suitably amplified, reduce and represent.In addition, each graphic in be omitted in and illustrate that a part for unessential component represents in execution mode.
The slewing of execution mode can preferably be used as video disc drive unit, especially carry the hard disk drives of the record video disc of magnetically record data.
Fig. 1 is the stereogram representing slewing 100.In FIG, in order to represent the formation of the inner side of slewing 100, and represent the state of unloading except top cover (not shown).Slewing 100 comprises pedestal 4, rotor 6, record video disc 8 and digital independent/write section 10.
Below, relative to pedestal 4, the side of carrying rotor 6 is set to upside and is described.
2.5 inch type record video discs of record video disc 8 to be such as diameter the be glass of 65mm, the diameter of its medium pore is such as 20mm, and thickness is such as 0.65mm.
Record video disc 8 is positioned on rotor 6, and rotates along with the rotation of rotor 6.Rotor 6 rotatably installs relative to pedestal 4 via bearing unit 12 not shown in Fig. 1.
The framework portion that pedestal 4 comprises the bottom forming slewing 100 and the periphery wall portion formed along the periphery of framework portion.Periphery wall portion is that the mode of surrounding the mounting region of recording video disc 8 is arranged.The upper surface of surrounding wall portion arranges screw outside.Pedestal 4 is such as formed by following methods.First, be required shape by die casting by the alloy forming of aluminium.Secondly, by the surface of the coating molding things such as epoxy resin.Thereafter, by a part for cut removing coating.
Digital independent/write section 10 comprises landmark (record-reproduce head) (not shown), swing arm 14, voice coil motor 16 and pivot 18.Landmark is arranged on the leading section of swing arm 14, data is recorded in record video disc 8, and reads data from record video disc 8.Pivot 18 swings freely support swing arm 14 relative to pedestal 4 around magnetic head rotating shaft S.Voice coil motor 16 makes swing arm 14 swing around magnetic head rotating shaft S, and make landmark move to record video disc 8 upper surface on desired location.Voice coil motor 16 and pivot 18 utilize the known technology of the position of control head and form.
Fig. 2 is the A-A line profile of Fig. 1.Slewing 100 also comprises core body 40 and coil 42.Core body 40 comprises annular portion 40a and from this annular portion 40a towards such as 12 salient pole 40b of radial direction (namely orthogonal with rotating shaft R direction) lateral expansion, and is fixed on the upper surface side of pedestal 4.Core body 40 is such as lamination 4 thin electromagnetic steel plates and is integrally formed by holding back conjunction.The surface of core body 40 is implemented to the insulation coating utilizing electro dipping or powder body coating etc. to carry out.Each salient pole 40b has coil 42.Coil 42 is such as that the metal wire surface at copper cash with the insulating barrier of urethane resin etc. reels and formed.By 3 phases roughly sinuous drive a current through this coil 42 and along salient pole 40b produce drive magnetic flux.At the upper surface of pedestal 4, the circular annular wall 4e centered by the rotating shaft R of rotor 6 is set.Core body 40 is by annular portion 40a press-in being fixed on pedestal 4 to the outer peripheral face of annular wall 4e.Also can between annular portion 40a and annular wall 4e coated with adhesive.
Pedestal 4 arranges the dead eye 4h centered by the rotating shaft R of rotor 6.Bearing unit 12 comprises shell 44 and axle sleeve 46, and relative to pedestal 4 rotatably support rotor 6.Shell 44 is such as fixed on by boning in the dead eye 4h of pedestal 4.What shell 44 had that cylindrical portion and bottom form as one has end cup-shaped, makes to be bonded and fixed on pedestal 4 downwards bottom it.
Shell 44 is such as formed by copper alloy, and implements nickel plating to its outer peripheral face.Axle sleeve 46 is components of the cylindrical shape on the side of the inner side being bonded and fixed at shell 44.To be formed in the upper end of axle sleeve 46 towards diametric(al) protuberance protruding outside.This protuberance cooperates with flange 30 direction of principal axis of restrict rotor 6 and the movement in rotating shaft R direction.
Axle 26 is accommodated in axle sleeve 46.Lubricant 48 is injected into axle 26, propeller boss 28 and the space between flange 30 and bearing unit 12.
At the inner peripheral surface of axle sleeve 46, the position separated up and down is formed with the radial dynamic pressure groove (not shown) of 1 group of chevron shape.First thrust dynamic pressure grooves (not shown) of chevron shape is formed at the lower surface of the flange 30 of the upper surface subtend with shell 44.Second thrust dynamic pressure grooves (not shown) of chevron shape is formed at the upper surface of the flange 30 of the lower surface subtend of the protuberance with axle sleeve 46.When rotor 6 rotates, by the dynamic pressure making lubricant 48 produce by these dynamic pressure grooves in radial direction and rotating shaft R direction support rotor 6.
In addition, the radial dynamic pressure groove of 1 group of chevron shape also can be formed on axle 26.In addition, also the first thrust dynamic pressure grooves can be formed in the upper surface of shell 44, also the second thrust dynamic pressure grooves can be formed in the lower surface of the protuberance of axle sleeve 46.
Rotor 6 comprises axle 26, propeller boss 28, flange 30 and cylinder-shaped magnet 32.Put video disc 8 is uploaded at the video disc mounting surface 28a of propeller boss 28.In arranging screw 26a coaxially with rotating shaft R on the upper surface of axle 26.Clamper 36 is crimped on the upper surface 28b of propeller boss 28 by the video disc fixing screw 38 that screws togather with screw 26a, and makes record video disc 8 be crimped on the video disc mounting surface 28a of propeller boss 28.
Propeller boss 28 is formed by ferrous materials such as the such as SUS430F with soft magnetism.Propeller boss 28 is by such as carrying out press process or cut to steel plate and being formed, and is formed as the given shape of roughly cup-shaped.
Axle 26 be and be fixed under press-in and the state that bonds the center being arranged on propeller boss 28 hole and in the propeller boss hole arranged coaxially with the rotating shaft R of rotor 6.Flange 30 has toroidal, and the section of flange 30 has inverted L-shaped shape.Flange 30 is such as fixed on the inner peripheral surface of the dip portion of propeller boss 28 by boning.
Cylinder-shaped magnet 32 is bonded and fixed at the inner peripheral surface of the cylindrical shape suitable with the barrel surface of the roughly inner side of the propeller boss 28 of cup-shaped.Cylinder-shaped magnet 32 is the rare earth element magnet formed by materials such as neodymium, iron, boron.This cylinder-shaped magnet 32 in diametric(al) with 12 of core body 40 salient pole 40b subtends.Cylinder-shaped magnet 32 is implemented to the driving magnetization of 16 poles along its circumferential direction.The surface of cylinder-shaped magnet 32 is implemented to the antirust treatment undertaken by electro dipping or injection application etc.
(manufacture method)
Below, the summary of the manufacture method of the slewing 100 of above-mentioned execution mode is described.
First, prepare to be injected with between axle sleeve 46 and axle 26 bearing unit 12 of lubricant 48, there is the core body 40 of coil 42, comprise the propeller boss 28 of the magnet 32 with particular magnetic polarity.Secondly, by the method hereafter described in detail, core body 40 is combined with pedestal 4.Secondly, utilize the method hereafter described in detail that bearing unit 12 is combined with pedestal 4.Secondly, axle 26 is entrenched in the hole of propeller boss, and propeller boss 28 is combined with bearing unit 12.Such as can utilize press-in fit, bonding or its etc. combination combine.Secondly, carry out supplemental lubrication agent 48 from the aperture be arranged on pedestal 4 (not shown) insertion fine needle and cram this aperture.Secondly, in order to ensure the conducting of pedestal 4 with bearing unit 12, and the electroconductive resin 52 of the edge of the downside of dead eye 4h and the lower end coating thermmohardening type of bearing unit 12 is spread all over.Secondly, the high-temperature process of the sclerosis promoting hardening resin 54 or electroconductive resin 52 and specific performance checking is performed.Then, propeller boss 28 carries record video disc 8, other components such as digital independent/write section 10 grade are combined with pedestal 4, thereafter, complete slewing 100 through other performance checkings.Above-mentioned steps performs in dust free room.
Secondly, the step that the core body 40 with coil 42 is combined with pedestal 4 is described.When salient pole 40b metal wire being wound on core body 40 forms coil 42, coil 42 is formed in the protrusion swelled around salient pole 40b.If there is protrusion, then the gap of the upper surface of coil 42 and the lower surface of propeller boss 28 and winding space reduce.If winding space reduces, then there is the possibility that coil 42 contacts with the lower surface of propeller boss 28.If coil 42 contacts with the lower surface of propeller boss 28, then send grating when propeller boss 28 rotates.In the worst case, coil 42 breaks and hinders normal rotation sometimes.In addition, if winding space is less, even if then do not contact after fabrication, sometimes because being subject to vibration in rheological parameters' change with time or transmission, impacting and cause coil 42 to contact with the lower surface of propeller boss 28.Therefore, the method that winding space is broadened can be considered, but slewing can be made so overall thickening and run counter to the requirement of slimming.
In addition, after can considering to be formed with coil 42 on core body 40, along the vertical direction precharge pressure is applied to coil 42 and axially flattens the method for protrusion.But core body 40 is fixed on the position of the top side of pedestal 4 sometimes because of the core body alignment error manufactured.Therefore, in order to maintain specific winding space, and all coils 42 is flattened into the thinness corresponding with core body alignment error.In order to press thinner, and apply larger precharge pressure.When considering core body alignment error to greatest extent, show that the precharge pressure applied coil 42 becomes the result of study of greatly 2000N.If precharge pressure becomes large, then the metal wire adjacent up and down in coil 42 contacts consumingly each other and causes insulating barrier to destroy, produces metal wire conducting and the bad possibility rising of so-called layer short circuit each other in this part.In addition, in the worst case, also broken string is produced sometimes.Experimentally, when applying the precharge pressure of 2000N to coil 42, in 10000 bench teat sample numbers, having observed 6, layer short circuit is bad and 1 broken string is bad.
With this problem accordingly, in embodiments, make core body 40 and pedestal 4 in conjunction with time, coil 42 is applied to the plus-pressure F of the scope hereafter describing its value in detail.In the method, as long as the protrusion of coil 42 lights below specific height from the benchmark pedestal 4, just winding space can be guaranteed.Therefore, except in fact core body alignment error is comparatively large and the height of the protrusion of coil 42 reaches except the situation of the upper limit of foozle, the winding space suppressing coil 42 to the contact of propeller boss 28 can be guaranteed with less plus-pressure F.Its result, can reduce the bad or bad possibility that breaks of the layer short circuit of generating coil 42.
Fig. 7 A ~ C represents the major part amplification profile core body 40 with coil 42 being fixed on the step 700 on pedestal 4.Use has sectional fixture (apparatus for assembling) 702, and this sectional fixture (apparatus for assembling) 702 comprises: the core body press section 702a pressurizeed to the annular portion 40a of core body 40; To the coil press section 702b that the upper surface of coil 42 pressurizes; And limiting coil press section 702b is to the limiting mechanism 702c of the plus-pressure F that coil 42 applies.Core body press section 702a and coil press section 702b is formed as the concentric toroidal in short transverse with jump respectively.This jump is set to maximum height allowed from the upper surface of the core body 40 of coil 42.Coil press section 702b is combined with core body press section 702a via limiting mechanism 702c.The plus-pressure F applied coil 42 is restricted to below specific higher limit by limiting mechanism 702c.There is no particular restriction for the formation of limiting mechanism 702c, such as, can comprise the elastomers such as helical spring.
The core body 40 comprising coil 42 is kept by core body maintaining part 702d.In this condition, coil press section 702b contacts with coil 42, and core body press section 702a contacts with annular portion 40a hardly (with reference to Fig. 7 A).If core body 40 moves downwards, then the upper end of the first periphery of the EDGE CONTACT annular wall 4e of the inner circumferential of the lower surface of the annular portion 40a of core body 40.If press down sectional fixture 702 further, then core body press section 702a contacts with annular portion 40a (with reference to Fig. 7 B).If press down sectional fixture 702 further, then core body press section 702a presses the periphery that annular portion 40a, annular portion 40a are press-fit into annular wall 4e.Till annular portion 40a is press-fit into the position that lower end contacts with pedestal 4 (with reference to Fig. 7 C).
During this period, coil 42 applies plus-pressure F by coil press section 702b and forms pressurization part 42a.Owing to keeping lower by limiting mechanism 702c by plus-pressure F, therefore between generating layer, the possibility of poor short circuit reduces.Experimentally, when the higher limit of plus-pressure F is restricted to 20N, in 10000 bench teat sample numbers, observed 1 layer short circuit bad, layer short circuit is bad to be greatly improved.And then, when the higher limit of plus-pressure F is constrained to 10N, in 10000 bench teat sample numbers, do not observe layer short circuit bad.In addition, if plus-pressure F is too low, then coil 42 can not get abundant shaping, thus produces highly bad possibility rising.When the higher limit of plus-pressure F is restricted to 3N, the height not observing coil 42 in every 10000 bench teat sample numbers is bad.Therefore, by plus-pressure F is limited in the scope of 3 ~ 10N, can while by level no problem in practical application for bad for the height of coil 42 suppression, poor short circuit between lower layer.
Pedestal 4 and core body 40 except above-mentioned press-in, also by combining the periphery of annular wall 4e and the inner circumferential coated with adhesive of annular portion 40a.In the reduction of the adhesion like this after can suppressing thermal shock test advantageously.
Next, the step 500 that bearing unit 12 is fixed on pedestal 4 is described to comparative example 1.Fig. 5 is the major part amplification stereogram of the step 500 represented bearing unit 12 and pedestal 4 irradiation ultraviolet radiation light beam 502.In order to easy understand, Fig. 5 be describe ultraviolet the end of a thread 510 be positioned at from bearing unit 12 extremely away from position.Fig. 6 A is the major part amplification view of the step 500 represented bearing unit 12 and pedestal 4 irradiation ultraviolet radiation light beam 502.Fig. 6 B is the C-C line profile of Fig. 6 A.
First, dead eye 4h coating is had to the hardening resin 54 of anaerobism hardening and UV cured property.As hardening resin 54, as long as be aqueous resin, be just not particularly limited.In execution mode, the TB1354 such as using threebond joint-stock company to manufacture etc. take acrylate as the fluid resin of principal component.The fluid resin taking acrylate as principal component is less owing to shrinking, so not easily produce gap at contact site (joint portion), prevent the sealing effectiveness of air leakage higher in better.The lower surface of bearing unit 12 is embedded in the dead eye 4h of pedestal 4.Standing special time is after such as 180 seconds, and the clearance portion hardening resin 54a anaerobism be present in the gap of the radial direction of dead eye 4h and bearing unit 12 is hardened.To the end gardening resin 54b irradiation ultraviolet radiation light beam 502 (with reference to Fig. 5) exposed on the edge of dead eye 4h.Specifically, end gardening resin 54b exists along the band shape that the circle that the external diameter of the lower surface of bearing unit 12 is 11.5mm is the wide circle of 1 ~ 2mm.Ultraviolet beam 502 is irradiated by 1 ultraviolet the end of a thread 510.The scope existing for range of exposures 502a tipping hardening resin 54b of ultraviolet beam 502.Range of exposures 502a is set to the circle that diameter is about 15mm.The center 502b of ultraviolet beam 502 is roughly positioned on rotating shaft R.End gardening resin 54b realizes Surface hardened layer after irradiating 60 seconds by ultraviolet beam 502.Thus, prevent end gardening resin 54b to the attachment of manufacturing equipment.That is, in comparative example 1, bearing unit 12 is that the clearance portion hardening resin 54a hardened by anaerobism in the gap of bearing unit 12 with the radial direction of dead eye 4h is guaranteed relative to the bond strength in manufacturing step of pedestal 4.
In comparative example 1, such as, when the manufacture interval of slewing 100 is 5 seconds, in order to ensure the time of repose of 180 seconds, the equipment that at least simultaneously can leave standstill 36 workpiece must be used.Therefore, there is the maximization of manufacturing equipment and the problem of great number.In addition, in comparative example 1, owing to being expose to wider scope from 1 ultraviolet the end of a thread 510, so the light quantity of per unit area is lower.In addition, ultraviolet beam 502 is that the light quantity of the central part of circle is maximum, and the light quantity of periphery is reduced to about 50% of central part.End gardening resin 54b is positioned at the lower periphery of light quantity compared with the central part of range of exposures 502a.Therefore, even if end gardening resin 54b is subject to irradiating for 60 seconds, the bond strength of bearing unit 12 and pedestal 4 is almost helpless to its case-hardened degree.
According to the result of comparative example 1, recognize maximization and the great number in order to suppress manufacturing equipment, problem is to make the end gardening resin 54b between bearing unit 12 and the lower surface of pedestal 4 harden at short notice to guarantee bond strength.
Inventor draws following opinion by research, and namely in order to make end gardening resin 54b firmly harden at short notice, following method or formation are comparatively effective, by being used alone or in combination these methods, can solve above-mentioned problem.
(1) method of multiple ultraviolet beam is irradiated from multiple ultraviolet the end of a thread.
(2) multiple Ultraviolet radiation region is divided into carry out the method for irradiation ultraviolet radiation light beam.
(3) method of the central part of ultraviolet beam is utilized.
(4) method of the reduced cross-sectional area of ultraviolet beam is made.
(5) make the central shaft of ultraviolet beam close to the method in the direction vertical with shadow surface.
(6) the polygonal area of delimiting with multiple hardening region becomes the method that large mode irradiates multiple ultraviolet beam.
Secondly, the step 300 that bearing unit 12 is fixed on pedestal 4 is described to execution mode.Fig. 3 is the major part amplification stereogram of the step 300 represented bearing unit 12 and pedestal 4 irradiation ultraviolet radiation light beam 302.In order to easy understand, Fig. 3 be describe ultraviolet the end of a thread 310 be positioned at from bearing unit 12 extremely away from position.Fig. 4 A is the major part amplification view of the step 300 represented bearing unit 12 and pedestal 4 irradiation ultraviolet radiation light beam 302.Fig. 4 B is the B-R-B line profile of Fig. 4 A.First, dead eye 4h coating is had to the hardening resin 54 of anaerobism hardening and UV cured property.The lower surface of bearing unit 12 is embedded in the dead eye 4h of pedestal 4.In this condition, end gardening resin 54b spreads all over the periphery at the edge of the end face arranging the opposition side of the side of rotor 6 of bearing unit 12 and the dead eye 4h of pedestal 4.End gardening resin 54b also can expose the edge being present in dead eye 4h, in addition, also can add on the edge being coated in dead eye 4h.In execution mode, step 300 performs before being the clearance portion hardening resin 54b anaerobism sclerosis in the gap being present in radial direction.Owing to saving the time of anaerobism sclerosis, so activity duration shortening.
The band shape that end gardening resin 54b is the wide circle of 1 ~ 2mm along the circle that the external diameter of the lower surface of bearing unit 12 is 11.5mm exists.If the excessive height of end gardening resin 54b, then make the irradiation time of internal stiffening required ultraviolet beam 302 elongated, if the height of end gardening resin 54b is too low, then bond strength reduces.In execution mode, the height of end gardening resin 54b is set to the scope of 0.2 ~ 0.4mm.In the scope of the level no problem in practical application of irradiation time, required bond strength can be obtained.
Ultraviolet beam 302 separately exposes to multiple Ultraviolet radiation region 302a, 302b, 302c along the circumferential direction of end gardening resin 54b.Ultraviolet beam 302 irradiates in the mode making the center of Ultraviolet radiation region 302a, 302b, 302c and be included in the existence range of banded end gardening resin 54b.Thus, due to the sclerosis making the maximum central part of the light quantity of ultraviolet beam 302 act on end gardening resin 54b, so firm time can be made to shorten.When irradiation ultraviolet radiation light beam 302, utilize pressing fixture (not shown) pressing axis bearing unit 12.Thus the buoyance lift of bearing unit 12 can be prevented.
End gardening resin 54b hardens and forms UV cured portion 54ba, 54bb, 54bc in Ultraviolet radiation region 302a, 302b, 302c.In execution mode, UV cured portion 54ba, 54bb, 54bc are circumferentially in the circumferential direction with the gap-forming of 120 degree.Part in the end gardening resin 54b of coating except UV cured portion 54ba, 54bb, 54bc is leak light by ultraviolet beam 302 and realizes Surface hardened layer.
Ultraviolet beam 302 such as can irradiate from multiple ultraviolet the end of a thread 310 (310a, 310b, 310c).Such as ultraviolet the end of a thread 310 comprises and sends ultraviolet LED (Light Emitting Diode, light-emitting diode), irradiates mouth and optical system.LED has in supply the ultraviolet sending specific wavelength during electric current.Optical system makes input ultraviolet be that given shape is assembled and exports ultraviolet beam 302.Optical system such as comprises convex lens and forms.Comprise ultraviolet the end of a thread 310a, 310b, 310c accordingly with each Ultraviolet radiation region 302a, 302b, 302c, each ultraviolet the end of a thread 310a, 310b, 310c export ultraviolet beam 302 respectively.Due to from multiple ultraviolet the end of a thread irradiation ultraviolet radiation, increase so irradiate light quantity corresponding to the quantity of ultraviolet the end of a thread.
The section shape of ultraviolet beam 302 is such as set to substantially elliptical (comprising circular) or substantially rectangular (comprising roughly square).Therefore, Ultraviolet radiation region 302a, 302b, 302c are set to substantially elliptical or substantially rectangular respectively.Ultraviolet radiation region 302a, 302b, 302c have the width dimensions W of the tangential direction centered by rotating shaft R and the width dimensions D of normal direction respectively.
Below, for by UV cured portion in the circumferential direction with the situation of the gap-forming of 180 degree on two positions (hereinafter referred to as test A), with the situation of the gap-forming of 120 degree on three positions (hereinafter referred to as test B), with the situation of the gap-forming of 90 degree on four positions (hereinafter referred to as test C), the bond strength in the direction of extracting bearing unit 12 from pedestal 4 is described.When this bond strength is more than 50N, even if carry out follow-up step continuously with the step of irradiation ultraviolet radiation light beam, such as make propeller boss 28 chimeric with bearing unit 12 and the step combined, it is no problem also to confirm in practical application.Therefore, test as follows under the such as condition of this bond strength as more than 50N.
The experimental condition shared: tangential direction width dimensions W is 6mm, and sample number is respectively 10, is fitted together to making both and after irradiation ultraviolet radiation, within 20 seconds, checks bond strength.
(1) A (UV cured portion is the situation at two positions, ultraviolet irradiation time=40 second) is tested
On average=95N
Maximum=135N
Minimum=65N
(2) B (UV cured portion is the situation at three positions, ultraviolet irradiation time=15 second) is tested
On average=358N
Maximum=680N
Minimum=140N
(3) C (UV cured portion is the situation at four positions, ultraviolet irradiation time=15 second) is tested
On average=360N
Maximum=700N
Minimum=180N
According to the above results, in test A ~ C, all required bond strength can be obtained in the short time below 40 seconds.In addition, required bond strength can be obtained in shorter 15 seconds in test B, C.In addition, the bond strength that comparatively test A is higher can be obtained in test B, C.Can think that its reason is, link adjacent UV cured portion each other and the polygonal larger area formed can obtain higher bond strength.According to foregoing, in test A ~ C, before can hardening in the clearance portion hardening resin 54a anaerobism between dead eye 4h and the outer peripheral face of bearing unit 12, carry out follow-up step.
Next, the focal length of adjustment lens makes the width dimensions W of the tangential direction in Ultraviolet radiation region change, and studies the irradiation time T of the hardness needs desired by end gardening resin 54b acquisition.
The experimental condition shared: ultraviolet the end of a thread 310 is 20mm with the distance L of end gardening resin 54b.
(1) when W=8mm, T=30 second.
(2) when W=6mm, T=15 second.
(3) when W=4mm, T=10 second.
According to the above results, width dimensions W smaller irradiation time T is shorter.In addition, the situation of W=6 is compared with the situation of W=8, and irradiation time T is obviously shorter.
Secondly, ultraviolet the end of a thread 310 is changed with the distance L of end gardening resin 54b, and studies the irradiation time T of the hardness needs desired by end gardening resin 54b acquisition.
The experimental condition shared: the width dimensions W of the tangential direction in Ultraviolet radiation region is 4mm.
(1) when L=10mm, T=15 second.
(2) when L=15mm, T=10 second.
(3) when L=20mm, T=10 second.
(4) when L=25mm, T=30 second.
According to the above results, time in the scope that distance L is 15 ~ 20mm, irradiation time T is the shortest.
Next, angle θ formed by the advance shaft of ultraviolet beam and the rotating shaft of bearing unit 12 is changed, and study the ratio of the width dimensions D of the normal direction in Ultraviolet radiation region and the width dimensions W of tangential direction and D/W ratio and end gardening resin 54b obtain desired by the irradiation time T that needs of hardness.
The experimental condition shared: the width dimensions W in Ultraviolet radiation region is 4mm, distance L is 20mm.
(1) when 0 °, D/W is than=1.00, T=10 seconds.
(2) when 10 °, D/W is than=1.02, T=10 seconds.
(3) when 20 °, D/W is than=1.06, T=10 seconds.
(4) when 30 °, D/W is than=1.15, T=15 seconds.
(5) when 40 °, D/W is than=1.31, T=15 seconds.
(6) when 50 °, D/W is than=1.56, T=20 seconds.
(7) when 60 °, D/W is than=2.00, T=20 seconds.
According to the above results, in the scope that angle θ is less than 20 °, the D in Ultraviolet radiation region is the circular roughly equal with the width dimensions W of tangential direction or roughly square, and irradiation time T is the shortest.That is, if the roughly equal angle θ of the width dimensions D in Ultraviolet radiation region and width dimensions W is the scope internal radiation ultraviolet beam of less than 20 °, then the required time of hardening shortens, thus operating efficiency promotes.
Fig. 8 is the curve chart of the inclination number of degrees distribution of the rotor 6 representing the slewing 100 utilizing the manufacture method of execution mode to manufacture.Be 15 and under the condition of width dimensions W=4mm, θ=20, angle °, distance L=20mm, irradiation time T=10 ~ 15 second at sample number, by UV cured portion in the circumferential direction with the gap-forming of 120 degree on three positions.As the gradient of rotor 6, and detect the difference of the maxima and minima of the height dimension of the video disc mounting surface 28a gained of the mounting record video disc 8 measuring propeller boss 28 in the circumferential direction.Measure under state before record video disc 8 is combined with propeller boss 28.In the curve chart of Fig. 8, transverse axis represents the size of the gradient of propeller boss 28, and the longitudinal axis represents the number of degrees.Such as, numeral " 1 " expression gradient above the numeral " 5 " of transverse axis is the number of degrees of 0 ~ 5 μm of person is 1.In addition, numeral " 5 " the expression gradient of numeral " 10 " top of transverse axis is the number of degrees of 6 ~ 10 μm of persons is 5.According to this curve chart, can be regarded as the maximum permissible value that is 50 μm relative to gradient, infer that fraction defective is fully lowly suppressed.
Above, be illustrated embodiments of the present invention, but it will be understood by those skilled in the art that above-mentioned execution mode is for illustrating, the combination of these each inscapes can have various variation, and these variation are also located within the scope of the invention.Or execution mode also can be combined each other.
In embodiments, the example that propeller boss 28 is combined with the bearing unit 12 be combined on pedestal 4 is illustrated, but is not limited thereto.The bearing unit 12 that such as propeller boss 28 also can be made to combine is combined with pedestal 4.It will be understood by those skilled in the art that such associated methods is also located within the scope of the invention.
In embodiments, all discontinuous example of the irradiation area of multiple ultraviolet beam is illustrated, but is not limited thereto.The irradiation area that such as may also be multiple ultraviolet beam is overlapping and continuously on periphery.In addition, the irradiation area that such as may also be ultraviolet beam presents roughly circular continuously.
In embodiments, the example vertical with tangential direction to the direction of ultraviolet beam is illustrated, but is not limited thereto.The direction of ultraviolet beam such as also can be made to tilt towards tangential direction.The width dimensions W of the tangential direction in Ultraviolet radiation region is elongated.In addition, the irradiation area of multiple ultraviolet beam can be connected to each other.
In embodiments, describe one side via limiting mechanism to coil and the face of rotor subtend pressurize the example simultaneously annular portion is pressed into annular wall, but be not limited thereto.Also can one side by the coil press section that maintains the jump of specific short transverse with core body press section to coil and the face of rotor subtend pressurize and simultaneously annular portion is pressed into annular wall.
In embodiments, the formation of so-called outer-rotor type is illustrated, but such as also can be the formation of so-called inner-rotor type.In embodiments, to using the formation of lamination core body to be illustrated, but core body also can not be lamination core body.In embodiments, epitrochanterian formation is fixed on to axle and is illustrated, but such as also can be as axle be fixed on pedestal as the formation of fixed shaft type.In embodiments, the formation that frame and pedestal form is illustrated, but such as also can be the formation that frame is combined with pedestal after being formed separately independent of pedestal.It will be understood by those skilled in the art that above-mentioned formation is also located within the scope of the invention.
Claims (10)
1. a manufacture method for slewing, this slewing comprises:
Rotor, for mounting record video disc;
Pedestal, has the dead eye centered by the rotating shaft of above-mentioned rotor and the annular wall centered by above-mentioned dead eye;
Bearing unit, rotatably supports above-mentioned rotor relative to said base, and is bonded and fixed in above-mentioned dead eye;
Core body, has the annular portion and the salient pole outstanding from above-mentioned annular portion towards radial direction that are fixed on above-mentioned annular wall; And
Coil, coiled wire on above-mentioned salient pole and being formed; And the feature of this manufacture method is to comprise the following steps:
Make above-mentioned bearing unit chimeric with the above-mentioned dead eye of said base, and make the circular band shape of hardening resin spread all over the periphery at the edge of the lower surface of above-mentioned bearing unit and the above-mentioned dead eye of said base; And
In the domain of the existence that above-mentioned hardening resin exists, pressing fixture pressing axis bearing unit, circumferential direction along this domain of the existence is positioned to multiple Ultraviolet radiation regions irradiation ultraviolet radiation light beam respectively of diverse location, the step of the above-mentioned ultraviolet beam of described irradiation performs in the mode of the centre of above-mentioned ultraviolet beam in the domain of the existence of the above-mentioned hardening resin of circular band shape.
2. the manufacture method of slewing according to claim 1, is characterized in that:
Simultaneously the step of irradiating above-mentioned ultraviolet beam irradiates above-mentioned ultraviolet beam from multiple ultraviolet the end of a thread corresponding with above-mentioned each Ultraviolet radiation region.
3. the manufacture method of slewing according to claim 1, is characterized in that:
The step of irradiating above-mentioned ultraviolet beam is when the rotating shaft of bearing unit is defined as center, be substantially equal to the mode of the width dimensions of tangential direction with the width dimensions of the normal direction in territory, above-mentioned ultraviolet radiation zone, adjust the angle of the advance shaft of above-mentioned ultraviolet beam and perform.
4. the manufacture method of slewing according to claim 2, is characterized in that:
The step of irradiating above-mentioned ultraviolet beam is when the rotating shaft of bearing unit is defined as center, be substantially equal to the mode of the width dimensions of tangential direction with the width dimensions of the normal direction in territory, above-mentioned ultraviolet radiation zone, adjust the angle of the advance shaft of above-mentioned ultraviolet beam and perform.
5. the manufacture method of slewing according to any one of claim 1 to 4, is characterized in that comprising the following steps:
One pressurizeing with the face of above-mentioned rotor subtend in the face of above-mentioned coil, one side is by above-mentioned annular portion press-in extremely above-mentioned annular wall.
6. a slewing, is characterized in that comprising:
Rotor, for mounting record video disc;
Pedestal, has the dead eye centered by the rotating shaft of above-mentioned rotor and the annular wall centered by above-mentioned dead eye;
Bearing unit, rotatably supports above-mentioned rotor relative to said base, and is bonded and fixed in above-mentioned dead eye;
Core body, has the annular portion and the salient pole outstanding from above-mentioned annular portion towards radial direction that are fixed on above-mentioned annular wall; And
Coil, coiled wire on above-mentioned salient pole and being formed; And
Above-mentioned bearing unit is entrenched in the above-mentioned dead eye of said base, and the circular band shape of hardening resin spreads all over the edge of the lower surface of above-mentioned bearing unit and the above-mentioned dead eye of said base,
In above-mentioned hardening resin, along the above-mentioned end face of above-mentioned bearing unit edge illumination ultraviolet beam and the region of hardening and UV cured portion are configured on the diverse location of circumferential direction, and to be at least formed on two positions.
7. slewing according to claim 6, is characterized in that:
In above-mentioned hardening resin, above-mentioned UV cured portion in the circumferential direction diverse location on be formed with three or everywhere.
8. the slewing according to claim 6 or 7, is characterized in that:
Above-mentioned coil to be included in when above-mentioned annular portion is press-fit into above-mentioned annular wall pair the pressurized plane flatly pressurizeed with the face of the lower surface subtend of above-mentioned rotor.
9. a manufacture method for slewing, this slewing comprises:
Rotor, for mounting record video disc;
Pedestal, has the dead eye centered by the rotating shaft of above-mentioned rotor; And
Bearing unit, rotatably supports above-mentioned rotor relative to said base, and is bonded and fixed in above-mentioned dead eye; And the feature of this manufacture method is to comprise the following steps:
Make above-mentioned bearing unit chimeric with the above-mentioned dead eye of said base, and make the circular band shape of hardening resin spread all over the periphery at the edge of the lower surface of above-mentioned bearing unit and the above-mentioned dead eye of said base; And
Pressing fixture pressing axis bearing unit, with the mode irradiation ultraviolet radiation light beam of the centre in Ultraviolet radiation region in the domain of the existence of above-mentioned hardening resin, above-mentioned hardening resin avoids the circular band shape in described bearing unit center.
10. an apparatus for assembling, in order to assemble slewing according to claim 6, is characterized in that comprising:
Core body press section, pressurizes to the annular portion of above-mentioned core body and the annular portion of above-mentioned core body is combined with the annular wall of said base;
Coil press section, when pressing down above-mentioned core body press section to said base, pressurizeing with the face of above-mentioned rotor subtend and first surface to above-mentioned coil; And
Limiting mechanism, is configured between above-mentioned core body press section and above-mentioned coil press section, in order to limit the plus-pressure that above-mentioned coil press section applies the first surface of above-mentioned coil, and is limited in the scope of 3 ~ 10N by this plus-pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011164373A JP2013030237A (en) | 2011-07-27 | 2011-07-27 | Rotation device and manufacturing method thereof |
| JP2011-164373 | 2011-07-27 |
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| Publication Number | Publication Date |
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| CN102904399A CN102904399A (en) | 2013-01-30 |
| CN102904399B true CN102904399B (en) | 2015-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210274400.2A Expired - Fee Related CN102904399B (en) | 2011-07-27 | 2012-07-25 | Rotary device, manufacturing method thereof and assembling apparatus thereof |
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| JP (1) | JP2013030237A (en) |
| CN (1) | CN102904399B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1930623A (en) * | 2004-03-08 | 2007-03-14 | 株式会社Kitano | Ultraviolet irradiation device for optical disk and ultraviolet irradiation method for optical disk |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6562176B2 (en) * | 1999-07-08 | 2003-05-13 | International Business Machines Corporation | Concentrated UV light curing of adhesive for pivot applications |
| JP4299926B2 (en) * | 1999-08-02 | 2009-07-22 | 関西ペイント株式会社 | Non-aqueous polymer dispersion and coating composition containing this polymer |
| JP2005114106A (en) * | 2003-10-09 | 2005-04-28 | Sankyo Seiki Mfg Co Ltd | Hydrodynamic bearing device, its manufacturing method and disc driving device |
| JP2007226083A (en) * | 2006-02-27 | 2007-09-06 | Epson Imaging Devices Corp | Method and apparatus for manufacturing electro-optic device |
| JP5519196B2 (en) * | 2009-06-24 | 2014-06-11 | サムスン電機ジャパンアドバンスドテクノロジー株式会社 | Disk drive |
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2011
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1930623A (en) * | 2004-03-08 | 2007-03-14 | 株式会社Kitano | Ultraviolet irradiation device for optical disk and ultraviolet irradiation method for optical disk |
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| JP2013030237A (en) | 2013-02-07 |
| CN102904399A (en) | 2013-01-30 |
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