JP2013055791A - Rotary apparatus and method of manufacturing rotary apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid enlargement of a device used in an adhesion step of an adhesion part of a rotary apparatus while improving manufacturing efficiency.SOLUTION: The rotary apparatus includes a first member and a second member fixed to each other by adhesion. A method of manufacturing the rotary apparatus includes the steps of: forming the first member and the second member; interposing an adhesive to be cured faster at a higher temperature between the first member and the second member; making the temperature of the adhesive higher than an atmospheric temperature by bringing a heating member which is not a part of the rotary apparatus into contact with the first member, the second member or both of them; and assembling the rotary apparatus by using the first member and the second member bonded to each other.

Description

  The present invention relates to a rotating device and a method for manufacturing the same.

  Disk drive devices such as hard disk drives are becoming smaller and larger in capacity, and are mounted on various electronic devices. In particular, the mounting of disk drive devices in portable electronic devices such as notebook computers and portable music playback devices is advancing. Conventionally, for example, a disk drive device described in Patent Document 1 has been proposed.

  A disk drive generally has an adhesive location that is secured using an adhesive. In order to cure such an adhesive in the manufacturing process of the disk drive device, batch processing using a high-temperature tank such as a burning furnace has been conventionally performed. In this batch process, for example, several hundred units are put together in a high-temperature tank, the inside of the tank is kept at a temperature higher than the atmospheric temperature outside the tank, and a few hours are waited. This accelerates the curing of the adhesive.

JP 2007-198555 A

Yoichi Namiki, Curing rate measurement and practice of chemically reactive resins (UV curing, heat curing, moisture curing), Information Technology Corporation, May 2009

  In order to increase production efficiency, it is desirable that more units can be processed in a high-temperature bath at once. On the other hand, the larger the number of units to be processed at a time, the larger the high temperature bath is required. Since the disk drive device dislikes dust and dust, its manufacture is generally performed in a clean room. Therefore, the high-temperature tank is also arranged in the clean room. However, when the high-temperature tank is enlarged, it is often necessary to enlarge the clean room accordingly. This is disadvantageous in terms of manufacturing equipment size and cost.

  Such a problem can occur not only in the disk drive device but also in other types of rotating equipment.

  The present invention has been made in view of such a situation, and the object thereof is to manufacture a rotating device capable of avoiding an increase in the size of a device used in the bonding step of the bonding portion of the rotating device while improving the manufacturing efficiency. The provision of technology.

  One embodiment of the present invention relates to a method for manufacturing a rotating device. The manufacturing method is a manufacturing method of a rotating device including a first member and a second member fixed to each other by bonding, a step of forming the first member and the second member, a first member and a second member In addition, a step of interposing an adhesive that cures faster as the temperature is higher, and a heating member that is not a part of the rotating device are brought into contact with the first member, the second member, or both, to thereby control the temperature of the adhesive. And a step of assembling the rotating device using the first member and the second member bonded to each other.

  According to this aspect, the adhesive is heated by heat conduction between the heating member and the first member, the second member, or both.

  Another aspect of the present invention is a rotating device. This rotating device includes a hub on which a recording disk is to be placed, and a base that rotatably supports the hub via a bearing unit. The bearing unit includes a housing having a recess with the rotation axis as the center, and a sleeve that is inserted into and fixed to the recess. The adhesive interposed between the housing and the sleeve is heated and cured by bringing a heating member that is not a part of the rotating device into contact with the housing and / or the sleeve.

  Note that any combination of the above-described constituent elements, and those obtained by replacing the constituent elements and expressions of the present invention with each other among methods, apparatuses, systems, etc. are also effective as an aspect of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the enlargement of the apparatus used at the adhesion process of the adhesion location of rotary equipment can be avoided, aiming at the improvement of manufacturing efficiency.

FIGS. 1A and 1B are a top view and a side view showing a rotating device manufactured by the manufacturing method according to the embodiment. It is the sectional view on the AA line of Fig.1 (a). It is a schematic diagram which shows the flow of the process in the adhesion | attachment process of the manufacturing method which concerns on embodiment. It is sectional drawing which shows typically the structure of the heating-cooling channel of FIG. It is the enlarged view to which the part enclosed with the broken line of FIG. 4 was expanded. FIG. 5 is a graph showing temperature changes of nine assemblies obtained by an experiment of heating and cooling the assembly using the heating and cooling channel of FIG. 4. FIG. It is sectional drawing which shows the structure for test | inspecting the extraction force of the assembly manufactured through the adhesion process of the manufacturing method which concerns on embodiment. It is a graph which shows the relationship between target hardening temperature and extraction force. It is a graph which shows the relationship between heating time and extraction force.

  Hereinafter, the same or equivalent components and members shown in the respective drawings are denoted by the same reference numerals, and repeated descriptions thereof are omitted as appropriate. In addition, the dimensions of the members in each drawing are appropriately enlarged or reduced for easy understanding. Also, in the drawings, some of the members that are not important for describing the embodiment are omitted.

  Typical adhesion points of rotating devices such as hard disk drives include between the hub and the shaft, between the bearing unit and the base, and between the housing and the sleeve in the bearing unit. These members are generally formed of a material having a relatively high thermal conductivity such as a metal.

  According to the method for manufacturing a rotating device according to the embodiment, in a bonding process of these members (hereinafter referred to as bonded members) fixed by bonding, the heating member is brought into contact with at least one of the bonded members. Thus, the uncured adhesive interposed between the adherend members is heated. In the adherend member, the location where the heating member comes in contact is different from the location where the adhesive is applied, but the thermal conductivity of the adherend member is relatively high, so the adhesive is made more efficient by the heat applied from the heating member. Can be heated. Thereby, the temperature (henceforth a hardening temperature) of the adhesive agent at the time of hardening an adhesive agent can be made higher in a short time. By using this technique in combination with an adhesive that cures faster as the curing temperature is higher, the time required to sufficiently cure the adhesive (hereinafter referred to as curing time) can be shortened.

  The “uncured” state of the adhesive is a state where the adhesive is not sufficiently cured, and the adhesive strength may be smaller than the nominal value at the time of curing. The “uncured” state may include a state in which the adhesive is partially cured, a state in which the adhesive is slightly cured, or a so-called temporary cured state. Alternatively, the “uncured” state may be a state in which the curing rate of the adhesive measured by, for example, the measuring method described in Non-Patent Document 1 is smaller than a predetermined value.

(Rotating equipment)
1A and 1B are a top view and a side view showing a rotating device 1 manufactured by the manufacturing method according to the embodiment. FIG. 1A is a top view of the rotating device 1. FIG. 1A shows a state in which the top cover 2 is removed in order to show the inner configuration of the rotating device 1. The rotating device 1 includes a base 4, a rotor 6, a magnetic recording disk 8, a data read / write unit 10, and a top cover 2. The rotating device 1 is a hard disk drive that rotates the magnetic recording disk 8.
Hereinafter, the side on which the rotor 6 is mounted with respect to the base 4 will be described as the upper side.
For example, in a hard disk drive, in order to ensure a high recording density, it is desired to reduce the inclination of the rotating portion with respect to the non-rotating portion, and the non-rotating portion and the adherend constituting the rotating portion have an accuracy of 10 μm or less, for example May be required to be combined.

The magnetic recording disk 8 is a glass 2.5-inch magnetic recording disk having a diameter of 65 mm, and the diameter of the hole in the center is 20 mm and the thickness is 0.65 mm.
The magnetic recording disk 8 is placed on the rotor 6 and rotates as the rotor 6 rotates. The rotor 6 is rotatably attached to the base 4 via a bearing unit 12 (not shown in FIG. 1A).

  The base 4 is formed by molding an aluminum alloy by die casting. The base 4 has a bottom plate portion 4 a that forms the bottom portion of the rotating device 1, and an outer peripheral wall portion 4 b that is formed along the outer periphery of the bottom plate portion 4 a so as to surround the mounting area of the magnetic recording disk 8. Six screw holes 22 are provided in the upper surface 4c of the outer peripheral wall 4b.

  The data read / write unit 10 includes a recording / reproducing head (not shown), a swing arm 14, a voice coil motor 16, and a pivot assembly 18. The recording / reproducing head is attached to the tip of the swing arm 14, records data on the magnetic recording disk 8, and reads data from the magnetic recording disk 8. The pivot assembly 18 supports the swing arm 14 so as to be swingable around the head rotation axis S with respect to the base 4. The voice coil motor 16 swings the swing arm 14 around the head rotation axis S and moves the recording / reproducing head to a desired position on the upper surface of the magnetic recording disk 8. The voice coil motor 16 and the pivot assembly 18 are configured using a known technique for controlling the position of the head.

  FIG. 1B is a side view of the rotating device 1. The top cover 2 is fixed to the upper surface 4 c of the outer peripheral wall portion 4 b of the base 4 using six screws 20. The six screws 20 correspond to the six screw holes 22, respectively. In particular, the top cover 2 and the upper surface 4c of the outer peripheral wall 4b are fixed to each other so that no leakage occurs from the joint portion to the inside of the rotating device 1. Here, specifically, the inside of the rotating device 1 is a clean space 24 surrounded by the bottom plate portion 4 a of the base 4, the outer peripheral wall portion 4 b of the base 4, and the top cover 2. This clean space 24 is designed so as to be sealed, that is, to prevent leak-in from the outside or leak-out to the outside. The clean space 24 is filled with clean air from which particles have been removed.

  FIG. 2 is a cross-sectional view taken along line AA in FIG. The rotating device 1 further includes a laminated core 40 and a coil 42. The laminated core 40 has an annular portion and twelve salient poles extending outward in the radial direction (that is, the direction orthogonal to the rotation axis R), and is fixed to the upper surface 4 d side of the base 4. The laminated core 40 is formed by laminating four thin electromagnetic steel plates and integrating them by caulking. An insulating coating such as electrodeposition coating or powder coating is applied to the surface of the laminated core 40. A coil 42 is wound around each salient pole. When a three-phase substantially sinusoidal drive current flows through the coil 42, a drive magnetic flux is generated along the salient poles. On the upper surface 4 d of the base 4, an annular annular wall 4 e centering on the rotation axis R of the rotor 6 is provided. The laminated core 40 is press-fitted into the outer peripheral surface 4g of the annular wall portion 4e or bonded and fixed by a clearance fit.

The base 4 is provided with a through hole 4 h centering on the rotation axis R of the rotor 6. The bearing unit 12 includes a housing 44 and a sleeve 46 and rotatably supports the rotor 6 with respect to the base 4. The housing 44 has a bottomed cup shape in which a cylindrical portion and a bottom portion are integrally formed. That is, the housing 44 has a recess 44a that opens upward with the rotation axis R as the center. The housing 44 is fixed to the through-hole 4h of the base 4 by bonding with the bottom part facing down. The housing 44 is formed by cutting a raw material brass into a predetermined shape and applying nickel plating.
As will be described later, the adhesive interposed between the housing 44 and the base 4 is heated and cured by bringing a heating member that is not a part of the rotating device 1 into contact with the housing 44 and / or the base 4.
A thermosetting conductive resin 52 is applied from the base 4 to the housing 44 at the lower edge of the through hole 4 h.

  The sleeve 46 is a cylindrical member that is inserted into the concave portion 44 a of the housing 44 and fixed by adhesion. At the upper end of the sleeve 46, an overhanging portion 46a is formed projecting outward in the radial direction. This overhanging portion 46 a limits the movement of the rotor 6 in the direction of the rotation axis R in cooperation with the flange 30. The sleeve 46 is formed by cutting a raw material brass into a predetermined shape and applying nickel plating.

  As will be described later, the adhesive interposed between the housing 44 and the sleeve 46 is heated and cured by bringing a heating member that is not a part of the rotating device 1 into contact with the housing 44 and / or the sleeve 46.

The shaft 26 is accommodated in the sleeve 46. A lubricant 48 is injected into the space between the shaft 26, the hub 28, the flange 30 and the bearing unit 12.
On the inner peripheral surface of the sleeve 46, a pair of herringbone-shaped radial dynamic pressure grooves 50 spaced apart in the vertical direction are formed. A herringbone-shaped first thrust dynamic pressure groove (not shown) is formed on the lower surface of the flange 30 facing the upper surface of the housing 44. A herringbone-shaped second thrust dynamic pressure groove (not shown) is formed on the upper surface of the flange 30 facing the lower surface of the overhanging portion 46a. When the rotor 6 rotates, the rotor 6 is supported in the radial direction and the rotation axis R direction by the dynamic pressure generated in the lubricant 48 by these dynamic pressure grooves.

A pair of herringbone-shaped radial dynamic pressure grooves may be formed in the shaft 26. Further, the first thrust dynamic pressure groove may be formed on the upper surface of the housing 44, and the second thrust dynamic pressure groove may be formed on the lower surface of the overhanging portion 46a.
In a rotating device equipped with a member to be bonded formed with a radial dynamic pressure groove, it may be required to suppress deformation of the member to be bonded formed with a radial dynamic pressure groove to, for example, 1 μm or less in order to ensure performance. .

  The rotor 6 includes a shaft 26, a hub 28, a flange 30, and a cylindrical magnet 32. The magnetic recording disk 8 is mounted on the disk mounting surface 28 a of the hub 28. Three disk fixing screw holes 34 are provided around the rotation axis R of the rotor 6 at intervals of 120 degrees on the upper surface 28 b of the hub 28. The clamper 36 is pressure-bonded to the upper surface 28b of the hub 28 by three disk-fixing screws 38 screwed into the three disk-fixing screw holes 34, and the magnetic recording disk 8 is pressure-bonded to the disk mounting surface 28a of the hub 28. Let

  The hub 28 is made of a steel material such as SUS430F having soft magnetism. The hub 28 is formed by, for example, pressing or cutting a steel plate, and is formed in a substantially cup-shaped predetermined shape. As the steel material of the hub 28, for example, stainless steel having a trade name of DHS1 supplied by Daido Steel Co., Ltd. is preferable because it has less outgas and is easy to process. Similarly, stainless steel of the product name DHS2 supplied by the company is more preferable in terms of further excellent corrosion resistance.

The shaft 26 is fixed to a hole 28c provided in the center of the hub 28 and provided coaxially with the rotation axis R of the rotor 6 in a state where press-fitting and adhesion are used in combination. The shaft 26 is formed of a steel material such as SUS420J2 that is harder than the raw material of the hub 28.
As will be described later, the adhesive interposed between the hub 28 and the shaft 26 is heated and cured by bringing a heating member that is not a part of the rotating device 1 into contact with the hub 28 and / or the shaft 26.
The flange 30 has an annular shape, and the flange 30 has an inverted L-shaped cross section. The flange 30 is fixed to the inner peripheral surface 28e of the hanging part 28d of the hub 28 by adhesion.

  The cylindrical magnet 32 is bonded and fixed to a cylindrical inner peripheral surface 28 f corresponding to the cylindrical surface inside the substantially cup-shaped hub 28. The cylindrical magnet 32 is formed of a rare earth material such as neodymium, iron, or boron, and faces the 12 salient poles of the laminated core 40 in the radial direction. The cylindrical magnet 32 is magnetized for driving with 16 poles in the circumferential direction (tangential direction of a circle with the rotation axis R as the center and perpendicular to the rotation axis R). The surface of the cylindrical magnet 32 is rust-proofed by electrodeposition coating or spray coating.

(Production method)
The manufacturing method according to the embodiment is a method of manufacturing a rotating device. The rotating device is, for example, a disk drive device, particularly a hard disk drive on which a magnetic recording disk is mounted. Hereinafter, a case where a rotating device similar to the rotating device 1 described above is manufactured will be described as an example.

  The rotating device includes a set of a shaft and a hub, a set of a bearing unit and a base, a set of a housing and a sleeve, and the like as a set of members fixed to each other by adhesion. Hereinafter, the manufacturing method according to the present embodiment will be described focusing on the adhesion between the housing and the sleeve. However, it will be apparent to those skilled in the art who have touched the present specification that the technical idea according to the present embodiment can be applied to a group of other members fixed together by bonding.

  The manufacturing method according to the present embodiment uses a step of forming a member of a rotating device including a housing and a sleeve, a bonding step of bonding and fixing the housing and the sleeve, and a housing, a sleeve, and other members that are bonded and fixed. And a step of assembling the rotating device and a step of inspecting the appearance, operation, function and the like of the assembled rotating device. The step of forming the member of the rotating device may be configured using a known processing technique such as cutting or casting. The assembly process may be configured using known assembly techniques. The step of inspecting may be configured using a known inspection technique.

  FIG. 3 is a schematic diagram showing a processing flow in the bonding step. The adhering step includes a step of placing the sleeve 146 on a jig, that is, the unit base 124, an adhesive applying step of applying an adhesive into the concave portion 144a of the housing 144, and an insertion of the sleeve 146 into the concave portion 144a of the housing 144. An insertion step for performing the curing step, and a curing step for curing the adhesive.

In the adhesive application step, the adhesive is applied to the annular adhesive application region 192 defined on the inner peripheral surface of the recess 144a. This adhesive is an adhesive that cures faster as the temperature is higher, for example, a thermosetting adhesive. Instead of the adhesive application region 192, an adhesive may be applied to the outer peripheral surface 146a of the sleeve 146 that should face the inner peripheral surface of the recess 144a. Alternatively, an adhesive may be applied to both the adhesive application region 192 and the outer peripheral surface 146a.
The adhesive used in the adhesive application step may be any adhesive that cures faster as the temperature is higher. For example, an adhesive containing an epoxy resin as a main component can be used. It is preferable in terms of high heat resistance.

In the insertion step, first, the sleeve 146 is inserted into the flange 130, and then the sleeve 146 with the flange 130 attached is inserted into the recess 144 a of the housing 144. As a result, the uncured adhesive is interposed between the sleeve 146 and the housing 144. That is, the outer peripheral surface 146a of the sleeve 146 and the peripheral surface of the concave portion 144a are at least partially opposed via the adhesive. Through this insertion process, an assembly in which the sleeve 146 is inserted into the recess 144a of the housing 144 is manufactured.
The adhesive application step and the insertion step together constitute a step of interposing the adhesive in the housing 144 and the sleeve 146 in an uncured state.

  In the curing step, the heating / cooling device 100 according to the present embodiment is used. The heating and cooling apparatus 100 has two heating and cooling channels 102 and 104 for heating and cooling the adhesive of the assembly. Each heating and cooling channel can process one assembly at a time. The heating / cooling device 100 indicated by a broken line in FIG. 3 indicates that two more heating / cooling devices 100 may be provided in parallel.

  In the curing process, the operator 106 operates the heating / cooling device 100 to bring the heating unit push rod into contact with the assembly while the assembly is still mounted on the unit table 124. As a result, the temperature of the uncured adhesive becomes higher than the ambient temperature. Further, in the curing step, after the temperature of the adhesive is made higher than the ambient temperature, the temperature of the adhesive is lowered by bringing a cooling unit push rod into contact with the assembly. The heating unit push rod and the cooling unit push rod are both part of the heating / cooling apparatus 100 and are not part of the assembly or the rotating device. In the present embodiment, the cooling unit push rod is a member different from the unit base 124 on which the assembly 126 is placed. The ambient temperature is the temperature around the assembly, and may be, for example, the temperature of the atmosphere around the assembly.

  FIG. 4 is a cross-sectional view schematically showing the configuration of the heating / cooling channel 102. FIG. 5 is an enlarged view of a portion surrounded by a broken line in FIG. The heating and cooling channel 102 is configured to move the assembly between the heating unit 136 that heats the assembly through mechanical contact, the cooling unit 138 that cools the assembly through mechanical contact, and the heating unit 136 and the cooling unit 138. Part 140.

  The moving unit 140 includes a unit table 124, a work table 128, and a slide cylinder 131. The assembly 126 to be heated and cooled is placed on the unit table 124 with the bottom of the housing 144 facing up. The unit base 124 includes a first base member 132 formed of a material having a relatively high thermal conductivity such as a metal, and a second base member 134 formed of a material having a relatively low thermal conductivity such as a resin. Have. For example, the first base member 132 is made of stainless steel, and the second base member 134 is made of PEEK (polyetheretherketone) resin.

  The first table member 132 contacts the assembly 126, and the second table member 134 contacts the work table 128 but does not contact the assembly 126. The portion of the unit base 124 that contacts the assembly 126 is preferably made of metal because it can be formed with high precision and has excellent durability. On the other hand, if the entire unit base 124 is made of metal, the heating target of the heating unit 136 is substantially the combination of the assembly 126 and the unit base 124, so that the rate of temperature rise can be reduced. Similarly, the rate of temperature drop by the cooling unit 138 can also be reduced. Therefore, in the heating / cooling device 100 according to the present embodiment, the unit base 124 includes the second base member 134 formed of resin, so that the proportion of the portion formed of metal in the unit base 124 is reduced. As a result, the heating unit 136 can raise the temperature of the assembly 126 faster, and the cooling unit 138 can lower the temperature of the assembly 126 faster.

  The unit table 124 is placed on a work table 128 made of a resin such as PEEK resin. The slide cylinder 131 positions the assembly 126 placed on the unit table 124 at a heating position vertically below the heating unit 136, and then positions the assembly 126 at a cooling position vertically below the cooling unit 138.

The heating unit 136 includes a heating cylinder 108, a heating unit cover 112, a heating plate 114, a heating spring 116, a heating unit push rod 118, a heater, that is, an electric heater 120, and a temperature sensor 122. .
When the assembly 126 is positioned at the heating position by the slide cylinder 131, the heating cylinder 108 pushes down the heating unit cover 112 that has been waiting at the standby position in the vertical direction. When the lower end of the heating unit push rod 118 hits the bottom of the housing 144, the heating unit cover 112 is further lowered by a predetermined distance from there and stopped. In this state, the heating unit push rod 118 is urged vertically downward by an elastic member, that is, a heating spring 116. By this urging force, the lower end of the heating unit push rod 118 is pressed against the bottom of the housing 144, and the assembly 126 is pressed against the unit base 124.

  A heating / cooling control unit (not shown) supplies a heating current to the electric heater 120 while the heating unit push rod 118 and the assembly 126 are in contact with each other. Then, the heat generated in the electric heater 120 flows from the contact portion between the heating unit push rod 118 and the housing 144 to the housing 144 via the heating plate 114 and the heating unit push rod 118. Thus, the heat flowing into the assembly 126 raises the temperature of the entire assembly 126 including the uncured adhesive above the ambient temperature. During this temperature increase, the temperature of the assembly 126, ie, the temperature of the adhesive, reaches a temperature in the range of 100 degrees Celsius to 170 degrees Celsius. For example, the upper limit of the temperature of the assembly 126 may be set to a temperature lower than the temperature at which the adhesive used starts to denature and deteriorate. The heating / cooling control unit controls the heating current based on the temperature indicated by the temperature sensor 122. The heating / cooling control unit stops the heating current when a predetermined heating time elapses after the heating current starts to flow through the electric heater 120. The heating cylinder 108 raises the heating unit cover 112 to the standby position.

  The heating plate 114 of the heating unit 136 may have a larger heat capacity than the heat capacity of the assembly 126. For example, the heat capacity of the heating plate 114 can be 10 times or more that of the assembly 126. Thereby, even when the heating current fluctuates, the fluctuation of the temperature of the adhesive can be suppressed. Therefore, it is possible to reduce the possibility that the temperature of the adhesive fluctuates excessively to cause modification and deterioration. In addition, when the heat capacity of the heating plate 114 is too large, the heating unit 136 can be enlarged. When the heat capacity of the heating plate 114 is 10,000 times or less than the heat capacity of the assembly 126, the heating unit 136 can be configured with a size that does not cause a problem in practice.

  The main factor that determines the length of the period during which the heating unit push rod 118 and the assembly 126 are in contact is the heating time. In the present embodiment, the length of the contact period is set in the range of 23 seconds to 280 seconds. From the viewpoint of work efficiency, it is desirable that the length of the contact period is set in the range of 23 to 60 seconds.

  The cooling unit 138 includes a cooling cylinder 150, a cooling unit cover 154, a cooling plate 156, a cooling spring 158, and a cooling unit push rod 160. After the heating process in the heating unit 136, the assembly 126 is positioned at the cooling position by the slide cylinder 131. The cooling cylinder 150 pushes down the cooling unit cover 154 waiting at the standby position in the vertical direction. The flow from when the cooling unit push rod 160 hits the bottom of the housing 144 until the cooling unit cover 154 stops is the same as that of the heating unit 136.

  A heating / cooling control unit (not shown) continues the state where the cooling unit push rod 160 and the assembly 126 are in contact with each other for a predetermined cooling time. Before the contact, the temperature of each member of the cooling unit 138 is about the ambient temperature, so heat is transferred from the assembly 126 to the cooling unit push rod 160 and the cooling plate 156 through the contact portion between the cooling unit push rod 160 and the housing 144. Flowing. At this time, the cooling plate 156 is a member having a relatively large heat capacity and functions as a heat bath. As a result, the temperature of the entire assembly 126 decreases toward the ambient temperature. When the cooling time has elapsed, the heating / cooling control unit drives the cooling cylinder 150 to raise the cooling unit cover 154 to the standby position.

  The cooling plate 156 of the cooling unit 138 may have a heat capacity that is greater than the heat capacity of the assembly 126. For example, the heat capacity of the cooling plate 156 can be greater than or equal to 10 times the heat capacity of the assembly 126. In this case, since the temperature lowering speed becomes relatively high, the working time can be further shortened.

FIG. 6 is a graph showing the temperature change of nine assemblies obtained by experiments in which the assembly is heated and cooled using the heating and cooling channel of FIG. In the graph of FIG. 6, the horizontal axis represents time, and the vertical axis represents assembly temperature. The graph of FIG. 6 shows a case where the ambient temperature is 20 degrees and the target value of the curing temperature in the heating and cooling control unit is set to 155 degrees Celsius. The left half of the graph of FIG. 6 shows the relationship between time and temperature during heating. As understood from this graph, for the assembly used in the experiment, the heating time is about 23 seconds, and the average temperature of the assembly reaches the target curing temperature of 155 degrees. Thus, the heating time was determined to be 24 seconds in consideration of the margin. Further, in about 12 seconds, which is about half of the heating time, the average temperature of the assembly reaches 140 degrees which is 15 degrees lower than the target curing temperature. That is, when the heating time is 24 seconds, the high temperature maintaining time during which the assembly temperature is maintained at a high temperature of the target curing temperature minus 15 degrees or more is 12 seconds.
The right half of the graph in FIG. 6 shows the relationship between time and temperature during cooling. As understood from this graph, in any assembly used in the experiment, the cooling time drops to about 40 degrees, which is about 14 seconds and 20 degrees higher than the ambient temperature. If it is about 40 degree | times, there will be no special difficulty for an operator to handle. For this reason, the cooling time was set to 14 seconds.

  According to the method for manufacturing a rotating device according to the present embodiment, it is possible to locally heat the adhesive to be cured. Thereby, since the temperature of an uncured adhesive can be made higher in a shorter time, the curing time can be shortened. As a result, the time spent in the bonding process can be shortened and the production efficiency can be increased.

  Further, since the curing time can be shortened, the possibility that the relative position between the housing 144 and the sleeve 146 is shifted before the adhesive is cured and the resin is cured as it is can be reduced. Furthermore, shortening the curing time contributes to a reduction in the dripping of the adhesive.

  Moreover, in the manufacturing method according to the present embodiment, a large number of assemblies are placed in a high-temperature bath at a time, and the number of processes per unit time is not increased, but the assemblies are processed one by one at a high speed. Increase the number of processes. Since the assembly is processed individually, the size of the heating and cooling device 100 is smaller than that of the hot bath. Therefore, the ratio of the apparatus for the bonding process in the clean room of the factory can be reduced, and the precious clean room space can be used more effectively.

  In the conventional method using only a high-temperature tank for promoting the curing of the adhesive, it may be possible to raise the temperature in the tank from the current one, but in this case, the members to be bonded are pressed against each other. Everything in the tank, including the jigs, must be hot. Therefore, the power consumption is increased as compared with the method according to the present embodiment in which necessary portions are concentrated and heated. Moreover, a high temperature tank is comparatively large, and it is unpreferable on the working environment of a factory that the inside of such a large high temperature tank becomes high temperature exceeding 100 degree centigrade.

There are at least the following two relationships between the production line of rotating equipment in a factory and the bonding process.
(1) Batch processing In the bonding process, each assembly is heated and cooled by a heating and cooling channel separately from the other assemblies. Each heating and cooling channel 102 processes one assembly at a time. Here, when the time spent in the bonding process greatly exceeds the line tact time of the other processes, the bonding process is separated from the main manufacturing line and performed independently.

(2) Inline In this embodiment, the time spent in the bonding process can be shortened, and depending on the setting, the line tact time can be reduced. For example, when the line tact time is 50 seconds, in this embodiment, the time spent in the bonding process can be about 40 seconds. Alternatively, when the line tact time is 25 seconds and the time spent in the bonding process is about 40 seconds, two sets of bonding processes may be connected in parallel. Alternatively, when the line tact time is 8 seconds and the time spent in the bonding process is about 40 seconds, six sets of bonding processes may be connected in parallel. In other words, the numerical value obtained by multiplying the line tact time by the number of sets that connect the bonding processes in parallel may be larger than the numerical value of the time spent in the bonding process.

  If the time spent in the bonding process is less than or equal to the line tact time, the bonding process can be part of the main production line, i.e. inline. In this case, it is not necessary to store the work such as the housing and the sleeve before and after the bonding process as in the case of the conventional batch processing using a high-temperature tank, so that the residence in the entire manufacturing process is reduced and the manufacturing efficiency is improved. Further, when the workpiece is collected, there is a possibility that the workpiece is scratched or foreign matter while the workpiece is collected, but such possibility can be reduced in-line. Further, the in-line operation reduces the time and labor for carrying the work and eliminates the need for a space for storing the work.

  FIG. 7 is a cross-sectional view showing a configuration for inspecting the pulling force of the assembly manufactured through the bonding process. The removal force is a force necessary to remove the sleeve 146 from the housing 144. In order to inspect the removal force, first, a screw is cut on the inner peripheral surface of the sleeve 146 of the assembly manufactured through the bonding process to obtain a female screw 146b. Next, the external thread 162 a at one end of the removal jig 162 is screwed with the female thread 146 b of the sleeve 146. Next, the removal jig 162 is pulled while the flange 130 is hooked on the fixing jig 164. When the pulling force of the pulling jig 162 reaches the pulling force, the bonding between the sleeve 146 and the housing 144 is broken, and the sleeve 146 is pulled out.

In order to examine the relationship between the target curing temperature and the extraction force set for the heating / cooling control unit and the relationship between the heating time and the extraction force, the present inventor will be described with reference to FIG. An experiment was conducted to measure the removal force by the method.
FIG. 8 is a graph showing the relationship between the target curing temperature and the removal force. The horizontal axis of the graph in FIG. 8 indicates the target curing temperature, and the vertical axis indicates the extraction force. The heating time and cooling time were set to 24 seconds and 14 seconds, respectively.
FIG. 9 is a graph showing the relationship between the heating time and the extraction force. The horizontal axis of the graph in FIG. 9 indicates the heating time, and the vertical axis indicates the extraction force. The target curing temperature and cooling time were set to 155 degrees Celsius and 14 seconds, respectively.

  As these graphs show, by properly setting the target curing temperature, heating time, and cooling time, the extraction force (about 500 N) achieved by the conventional method can be reduced while reducing the time spent in the bonding process. An unrivaled removal force can be achieved. For example, according to FIG. 8, the removal force becomes maximum when the target curing temperature is around 160 degrees Celsius. In addition, according to FIG. 9, in general, the extraction force increases as the heating time increases. Accordingly, by setting the target curing temperature at around 160 degrees Celsius where the removal force is maximized or maximized, a higher removal force can be obtained if the heating time is the same. Also, if the required removal force is the same, the heating time can be shortened.

  In the method for manufacturing a rotating device according to the present embodiment, after heating the assembly in the bonding step, the assembly is cooled by bringing the cooling unit push rod 160 into contact with the assembly. This allows the assembly to cool faster than otherwise. That is, the time required for cooling the assembly can be shortened. As a result, the time spent in the bonding process can be further shortened.

  The method for manufacturing the rotating device according to the embodiment has been described above. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to the combination of each component, and such modifications are also within the scope of the present invention.

  In the embodiment, the case where the rotating device 1 that is a hard disk drive is manufactured has been described. However, the manufacturing target is not limited to the hard disk drive. For example, the technical idea of the embodiment can be applied to a manufacturing method of an arbitrary rotating device including two members fixed to each other by adhesion.

In the embodiment, the case where the assembly is heated by heating the heating unit push rod 118 in contact with the assembly with the electric heater 120 has been described. However, the present invention is not limited to this. Other heating methods for the assembly include microwave heating and induction heating (IH). Alternatively, a configuration in which a heater is not provided and the heating unit push rod is made to stand by in a high temperature bath instead is also possible.
In the embodiment, the case where the heating unit push rod 118 is heated by supplying a heating current to the electric heater 120 while the heating unit push rod 118 is in contact with the assembly 126 has been described. Not limited. For example, before the heating unit push rod 118 comes into contact with the assembly 126, heating of the heating unit push rod 118 may be started by supplying a heating current to the electric heater 120. In this case, the time required for raising the temperature of the assembly 126 can be shortened.

  In the embodiment, the case where the assembly is cooled by bringing the cooling unit push rod 160 into contact with the assembly and releasing the heat of the assembly has been described. However, the present invention is not limited to this. For example, a configuration in which the cooling unit 138 is not provided and the system waits for natural cooling is also possible. Other cooling methods for the assembly include natural air cooling with fins, forced air cooling with fans, liquid cooling (water cooling), heat pipes, and combinations thereof. Alternatively, electrical cooling with Peltier elements may be used. Alternatively, a configuration in which the cooling unit push rod is made to stand by in the low temperature bath is also possible.

  In the embodiment, the case where both the heating unit push rod 118 and the cooling unit push rod 160 are in contact with the bottom of the same housing 144 has been described. However, the present invention is not limited to this, and the assembly in which the heating unit push rod 118 is in contact. May be different from the assembly location where the cooling unit push rod 160 contacts.

  Although the case where the cooling unit push rod 160 is a member different from the unit base 124 has been described in the embodiment, the present invention is not limited to this. For example, instead of providing the cooling unit 138, a configuration for forcibly cooling the unit base 124 may be provided.

  In the manufacturing method according to the embodiment, after the step of bringing the heating member into contact to raise the temperature of the adhesive to be higher than the ambient temperature, a step of additionally placing the assembly or the rotating device in a high-temperature tub is provided. Also good.

  1 rotating device, 2 top cover, 4 base, 6 rotor, 8 magnetic recording disk, 10 data read / write section, 28 hub.

Claims (9)

A method of manufacturing a rotating device including a first member and a second member fixed to each other by bonding,
Forming a first member and a second member;
A step of interposing an adhesive that cures faster as the temperature is higher between the first member and the second member;
A step of bringing the temperature of the adhesive higher than the ambient temperature by bringing a heating member that is not part of the rotating device into contact with the first member or the second member or both,
And a step of assembling the rotating device using the first member and the second member bonded to each other.   The method further includes the step of lowering the temperature of the adhesive by bringing the first member and / or the second member into contact with a cooling member that is not part of the rotating device after the temperature of the adhesive is higher than the ambient temperature. The manufacturing method of Claim 1 characterized by the above-mentioned.   3. The method according to claim 1, wherein the temperature of the adhesive reaches a temperature in the range of 100 degrees Celsius to 170 degrees Celsius in the step of raising the temperature of the adhesive to be higher than the ambient temperature.   In the step of making the temperature of the adhesive higher than the ambient temperature, the length of the period in which the first member and / or the second member are in contact with the heating member is in the range of 23 seconds to 280 seconds. The manufacturing method according to any one of claims 1 to 3.   The manufacturing method according to claim 1, wherein the heating member is heated by an electric heater.   The time spent in the step of interposing the adhesive and the step of raising the temperature of the adhesive above the ambient temperature is set to be equal to or shorter than the line tact time of the other steps. The manufacturing method as described.   The rotating device has a hub on which the recording disk is to be placed and a base that rotatably supports the hub via the bearing unit. The bearing unit is inserted into the housing having a recess centered on the rotating shaft and the recess. The manufacturing method according to claim 1, wherein the first member is a housing and the second member is a sleeve. The process of interposing the adhesive is
Placing either the housing or the sleeve on a jig;
Applying an adhesive to the inner peripheral surface of the concave portion of the housing or the outer peripheral surface of the sleeve to be opposed to the inner peripheral surface, or both;
Inserting a sleeve into the recess of the housing,
The process of making the temperature of the adhesive higher than the ambient temperature is
The manufacturing method according to claim 7, further comprising a step of bringing a heating member into contact with the assembly in which the sleeve is inserted into the concave portion of the housing while the assembly is placed on the jig. A hub on which the recording disk should be placed;
A base that rotatably supports the hub via a bearing unit,
The bearing unit includes a housing having a recess centered on the rotating shaft, and a sleeve that is inserted into and fixed to the recess.
A rotating device characterized in that the adhesive interposed between the housing and the sleeve is heated and cured by bringing a heating member that is not a part of the rotating device into contact with the housing and / or the sleeve.

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