WO2011027823A1 - 搬送ラック、金属リングの保持方法及び熱処理方法 - Google Patents
搬送ラック、金属リングの保持方法及び熱処理方法 Download PDFInfo
- Publication number
- WO2011027823A1 WO2011027823A1 PCT/JP2010/065024 JP2010065024W WO2011027823A1 WO 2011027823 A1 WO2011027823 A1 WO 2011027823A1 JP 2010065024 W JP2010065024 W JP 2010065024W WO 2011027823 A1 WO2011027823 A1 WO 2011027823A1
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- Prior art keywords
- holding
- metal ring
- metal rings
- transport rack
- holding shafts
- Prior art date
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0025—Supports; Baskets; Containers; Covers
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/12—Travelling or movable supports or containers for the charge
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D5/00—Supports, screens, or the like for the charge within the furnace
Definitions
- the present invention relates to a transport rack for transporting a metal ring that is preferably used as a belt for a continuously variable transmission (CVT), a method of holding a metal ring using the same, and a heat treatment method.
- CVT continuously variable transmission
- a belt composed of a laminated ring in which a plurality of metal rings are laminated is responsible for power transmission.
- the metal ring is generally solution-treated, aged, or nitrided to a preform formed by cutting a cylindrical drum made of maraging steel into a predetermined width.
- Etc. are produced by performing predetermined
- the conveyance rack described in JP-A-2007-191788 has a plurality of holding shafts erected on a base, and on each of the holding shafts, a plurality of ring seats forming an abacus piece shape are attached Be In such a configuration, a metal ring is interposed between adjacent ring seats as shown in FIG. 4 of the Japanese Patent Application Laid-Open No. 2007-191788.
- JP-A-10-251741 a plurality of frame members are provided on each of a plurality of holding shafts, and adjacent frame members sandwich an intermediate substrate to be an aluminum substrate for a magnetic disk.
- the piece shape of the abacus can be locally approximated to the protrusion 1 of the triangular prism shape shown in FIG.
- Reference numeral 2 in FIG. 39 indicates a holding shaft provided on a base not shown.
- the holding shaft 2 has a substantially rectangular parallelepiped shape, and the protrusions 1 are provided on the short side of the holding shaft 2 so as to be separated at a predetermined interval along the axial direction of the holding shaft 2 There is.
- FIG. 40 is a front view with the viewpoint at the center of the metal ring 3
- FIG. 41 is a side view along the axial direction of the protrusion 1. As shown in FIG. 40 and FIG. 41, the metal ring 3 is sandwiched by the adjacent projections 1 and 1.
- the top of the protrusion 1 is directed to the center of the metal ring 3, so the lower end face of the metal ring 3 is placed on the upper inclined surface of the lower protrusion 1 while the lower portion of the upper protrusion 1 is The upper end surface of the metal ring 3 abuts on the side inclined surface (see FIG. 41). Both the lower end surface and the upper end surface of the metal ring 3 are in line contact with the respective inclined surfaces of the protrusions 1 (see particularly FIG. 40).
- the line contact between the metal ring 3 and the protrusions 1 and 1 is maintained. That is, the contact point between the metal ring 3 and the protrusions 1 is relatively large in area.
- the heat of the metal ring 3 is deprived by the projections 1 and 1 from the contact area between the large-area metal ring 3 and the projections 1 and 1. Therefore, the temperature of the metal ring 3 is not sufficiently raised, and there is a concern that the nitriding may not proceed sufficiently.
- the nitriding gas does not contact the contact area between the large-area metal ring 3 and the protrusion 1. Therefore, there is a concern that the degree of nitriding may be uneven.
- the main object of the present invention is to provide a transport rack which can avoid taking heat away from the metal ring.
- Another object of the present invention is to provide a transport rack capable of avoiding the occurrence of unevenness in the degree of heat treatment.
- Another object of the present invention is to provide a method of holding a metal ring using the above-described transport rack.
- Still another object of the present invention is to provide a heat treatment method of a metal ring using the above-mentioned transport rack.
- a transport rack for holding and transporting a plurality of metal rings having elastic resilience comprising: The foundation, A plurality of holding shafts which are erected on the base and extend in parallel with each other, and on the side walls of which a plurality of projections are provided to abut the lower end surface of the metal ring; Equipped with The projection may be in contact with a lower end surface of the metal ring in a point contact manner.
- the metal ring is held by the holding shaft in a state of being in point contact with the projection. Because of the point contact, the contact area between the protrusion and the metal ring is extremely small. For this reason, the restraining force of the protrusion with respect to the metal ring is also reduced.
- the metal ring when the metal ring is subjected to heat treatment, the metal ring can be thermally expanded to approach the holding shaft without being blocked by the projection. In other words, since the suppression of the thermal expansion of the metal ring is avoided, the concern that the metal ring is distorted may be eliminated.
- the contact area between the protrusion and the metal ring is extremely small, heat transfer between the protrusion and the metal ring is minimized, and various gases such as a nitriding gas can easily flow around. For this reason, the temperature of the metal ring is substantially uniform throughout, and various gases contact substantially the entire metal ring.
- the heat treatment can be performed substantially uniformly over the entire metal ring. That is, for example, the nitriding treatment can be performed uniformly.
- the protrusion can be configured as, for example, a tapered reduced diameter portion in which the diameter of the portion in contact with the metal ring decreases in a tapered manner as the portion approaches the metal ring.
- a suitable example of such a projection part a cone-shaped body, a truncated cone shape body, etc. are mentioned.
- the protrusion may be a triangular prism-shaped body having an inclined surface which is directed vertically downward as the metal ring is approached.
- the inclined surface abuts on the lower end surface of the metal ring.
- the top of the protrusion may be directed in a direction other than the center of the metal ring.
- the protrusion may be a cylindrical body.
- the diameter of the cylindrical body may be set so as to be in point contact with the metal ring.
- a blocking projection that is interposed between the adjacent protrusions and that abuts on the side wall of the metal ring.
- the locking projection presses the metal ring inward in the diameter direction. That is, the metal ring is pressed by the blocking projection in a state in which the expansion force is generated, and is held in this state.
- the above-mentioned projection part can be made into the thing of not only the primary role for holding a metal ring but an auxiliary role for preventing that a metal ring falls. Therefore, since the contact area between the metal ring and the projection can be made as small as possible, the above-mentioned effects can be obtained more easily.
- two or more rows of metal rings may be held by one transport rack.
- the plurality of holding shafts may be arranged so as to be able to hold the metal rings in a state in which two or more rows of metal rings are arranged in tandem.
- a connecting disc which is disposed apart from the base and to which the ends of all the holding shafts are connected. This prevents the holding shaft holding the metal ring from tilting. Therefore, it is possible to prevent the metal ring from falling off due to the tilt of the holding shaft.
- the holding shaft is preferably made of nickel or a nickel base alloy.
- a nickel or nickel-based alloy film may be formed on the surface.
- Nickel functions as a barrier to the diffusion of the constituent elements of the holding shaft into the metal ring during various heat treatments such as nitriding treatment. Therefore, a metal ring having a good appearance (excellent in appearance) can be easily obtained.
- the base may be configured to displace at least a portion of the plurality of holding shafts in the direction in which the diameter of the inscribed circle formed by the holding shafts increases or decreases. It is preferable to set it up. In this case, by displacing the holding shaft so that the diameter of the inscribed circle is appropriately changed, the diameter of the metal ring to be subjected to various heat treatments such as nitriding can be accommodated. That is, it is possible to hold metal rings of various diameters.
- the base may be bent due to heat generated during heat treatment.
- the base and the coupling plate tend to bend in a direction approaching each other. If such a situation occurs, there is a concern that the holding shaft may be pinched between the bent base and the coupling board, making it difficult to displace.
- the base and the connecting board bend so as to approach each other as they are connected to the holding shaft. Therefore, after the heat treatment is completed, when the base and the connecting disc are separated from the holding shaft that holds only one row of metal rings, the base and the connecting disc are elastically separated from the holding shaft that holds only one row of metal rings Do.
- the holding shaft holding only one row of metal rings is released from the restraint by the base and the coupling plate. Therefore, the holding shaft can be easily displaced.
- all of the plurality of holding shafts may be provided so as to be displaceable.
- one row may hold small diameter metal rings while the other row may hold large diameter metal rings. Is possible. That is, it is possible to simultaneously hold the metal rings having different diameters and to perform the above-described heat treatment.
- the connecting disc is a substantially H-shaped body having two long bar portions extending in parallel to one another and one short bar portion connecting the long bar portions, and It is preferable that the two long bars have a substantially C-shape when their tips approach each other. By setting it as such a shape, a lightweight connection board can be comprised. Moreover, it becomes easy to hold the metal ring on the holding shaft.
- a plurality of holding shafts are provided standing on a base and extending in parallel with each other to perform heat treatment on a plurality of metal rings having elastic resilience.
- a holding method of a metal ring is provided in which the protrusion is brought into point contact with the lower end surface of the metal ring.
- the holding projections be in contact with the side walls of the metal ring using a holding shaft in which the holding projections are further provided between the adjacent projections.
- the temperature of the metal ring at the time of heat treatment becomes substantially uniform throughout, and various heat treatment gases such as nitriding gas are brought into contact with substantially the entire metal ring.
- various heat treatment gases such as nitriding gas are brought into contact with substantially the entire metal ring.
- the heat treatment can be applied uniformly.
- At least a part of the plurality of holding shafts be displaceable in the direction in which the diameter of the inscribed circle formed by the holding shafts becomes larger or smaller.
- the holding shaft when at least a part of the holding shaft is erected on the base so as to be displaceable, the holding shaft is displaced so that the diameter of the inscribed circle is appropriately changed, the diameter of the metal ring to be subjected to heat treatment It can correspond. That is, by changing the position of the holding shaft, it is possible to hold metal rings of various diameters.
- a plurality of holding shafts are arranged so as to be able to be held in a state in which metal rings are arranged in two or more rows in a row, and when the coupling plate is provided, the holding shafts hold both of two adjacent rows of metal rings. Is fixed while the holding shaft holding only one row of metal rings is displaceable, and the axial dimension of the fixed holding shaft is compared with the displaceable holding shaft. It is preferable to set a large size. Then, only the displacing holding shaft may be displaced after being released from the restraint on the base.
- this makes it possible to easily displace the holding shaft. At the same time, it is also possible to improve the processing efficiency of the metal ring.
- a heat treatment method of a metal ring which is heat-treated in a state where a plurality of metal rings having elastic resilience are held by a transport rack, It is a columnar member which is erected on a base constituting the transport rack and extends in parallel with one another and whose horizontal cross section is a polygonal shape, and one of its side faces the metal ring, and further, the metal ring Holding the metal ring on the transport rack by bringing the lower end surface of the metal ring into point contact with the projections with respect to a plurality of holding shafts in which a plurality of projections are provided only on the side surface facing; Carrying the metal ring together with the transport rack into a heat treatment furnace and subjecting the metal ring to the heat treatment; A method of heat treating a metal ring is provided.
- the holding shaft in which the protrusion is provided only on the side surface facing the metal ring, the holding shaft is small in size, light in weight and small in heat capacity. can get. Therefore, the metal ring and the transport rack can be easily transported, and the occurrence of unevenness in the heat treatment can be more easily avoided.
- FIG. 2 is a top plan view of the transport rack of FIG. 1; It is a longitudinal cross-section front view which shows the state which introduced the conveyance rack in the heat processing furnace.
- FIG. 12 is a top plan view of the transport rack of FIG. 11; It is a longitudinal cross-section front view which shows the state which introduced the conveyance rack in the heat processing furnace. It is a disassembled perspective view at the time of laminating
- FIG. 20 is an overall schematic perspective view showing a state in which the transport racks are stacked from FIG. 19; In 2nd Embodiment, it is a principal part front view from the center of the metal ring which shows the state which the lower end surface of the metal ring point-contacted to the holding projection part of another shape.
- FIG. 23 is a top plan view of the transport rack of FIG. 22. It is a longitudinal cross-section front view which shows the state which introduced the conveyance rack in the heat processing furnace. It is a disassembled perspective view at the time of laminating
- FIG. 34 is a longitudinal cross-sectional view in the vicinity of one end portion of the holding shaft when the holding shaft constituting the transport rack of FIG. 33 is located at the backward end.
- FIG. 35 is a longitudinal cross-sectional view in the vicinity of one end of the holding shaft when the holding shaft of FIG. 34 is displaced to the forward end.
- the axial dimension of the holding shaft holding both of the two rows of metal rings is made larger than that of the holding shaft holding only one of the two rows of metal rings.
- FIG. 36 is a front view showing a state in which the base and the coupling board are released from the restraint with respect to the holding shaft holding only one of the two rows of metal rings from FIG.
- FIG. 40 is a main part side view showing a state in which the metal ring is held between the protrusions shown in FIG. 39 along the axial direction of the protrusions.
- a transport rack having a holding shaft whose top has a protrusion facing the center of the metal ring and which has a tapered reduced diameter portion will be described as a first embodiment.
- FIG. 1 is an overall schematic perspective view of the transport rack 10 according to the first embodiment
- FIG. 2 is an overall schematic perspective view showing the transport rack 10 holding a metal ring R1, R2.
- the transport rack 10 is for holding and transporting a plurality of metal rings R1 as a first row L1 and a plurality of metal rings R2 as a second row L2.
- the base 12 and the base 12 stand upright.
- the ten holding shafts 14a to 14j and the connecting board 16 connected to all the ten holding shafts 14a to 14j.
- the metal rings R1 and R2 are given different reference numerals for convenience of explanation, the configurations of the metal rings R1 and R2 are the same. Further, in the holding shafts 14a to 14j, the holding shafts 14a to 14d and 14f to 14i have the same configuration, and the holding shafts 14e and 14j have the same configuration.
- the base 12 has a shape in which a right-angled isosceles triangle is cut out from the long side to the short side of the flat plate, and is thus formed into an octagonal shape.
- large circular openings 18a and 18b and small circular openings 20a and 20b for lightening are formed to penetrate. The formation of the large circular openings 18 a and 18 b and the small circular openings 20 a and 20 b reduces the weight of the base 12 and eventually contributes to the weight reduction of the transport rack 10.
- the base 12 has a holding shaft insertion recess 22, a bolt insertion hole 24 penetrating from the lower surface of the base 12 to the holding shaft insertion recess 22, and two connection pin insertion holes 26. Is formed.
- the lower ends of the holding shafts 14a to 14j are inserted into the holding shaft insertion recess 22 and connected to the base 12 by bolts 28 inserted into the bolt insertion holes 24.
- the holding shafts 14a to 14j are erected on the base 12.
- FIG.4 and FIG.5 The principal part longitudinal cross-sectional view of the holding shaft 14e and the principal part schematic perspective view are shown by FIG.4 and FIG.5, respectively.
- the holding shaft 14e is formed as a quadrangular prism and has a substantially conical holding projection (hereinafter simply referred to as a projection) on the two short side surfaces. ) 30 is a formed solid body.
- the holding shaft 14 j has the same configuration as the holding shaft 14 e.
- the remaining holding shafts 14a to 14d and 14f to 14i are configured in compliance with the holding shaft 14e except that the protrusion 30 is formed on only one of the two short side surfaces. There is.
- the protrusions 30 of the holding shafts 14a to 14d and 14f to 14i are provided such that the tops thereof are directed to the centers of the metal rings R1 and R2.
- the protrusions 30 of the holding shafts 14 e and 14 j extend such that the tops thereof are oriented in the longitudinal direction of the base 12 to face the metal rings R 1 and R 2.
- Each projection 30 is curved at the top of a conical shape so that the top surface of the truncated cone is raised.
- the tops of the protrusions 30 face the metal rings R1 and R2, and accordingly, the protrusions 30 taper in diameter from the holding shafts 14a to 14j toward the metal rings R1 and R2. That is, the protrusion 30 has a tapered reduced diameter portion 32.
- the metal rings R ⁇ b> 1 and R ⁇ b> 2 are sandwiched between the adjacent protrusions 30 and 30.
- the lower end surface of the metal ring R1 or R2 is placed on the projection 30 located below the metal ring R1 or R2, while the upper end surface of the projection 30 located on the upper side and the metal ring R1 or R2 You may make it space apart.
- the holding shafts 14a to 14j having such a shape can be manufactured, for example, by forming the projection 30 by cutting a solid square pole from the outer wall side.
- the quadrangular prism and the protrusion 30 are manufactured as separate members, and for example, a screw hole is formed on the short side surface of the quadrangular prism while the screw is formed on the bottom of the protrusion 30
- the screwed round rod may be provided, and the screwed round rod may be screwed into the screw hole.
- the holding shafts 14a to 14j are erected on the base 12 so that the positions of the protrusions 30 coincide with each other. Therefore, the metal ring R1 is interposed between the protrusions 30 of the holding shafts 14a to 14e and 14j, and the metal ring R2 is interposed between the protrusions 30 of the holding shafts 14e to 14j. That is, among the holding shafts 14a to 14j, two of the holding shafts 14e and 14j hold both of the metal rings R1 and R2 (the first row L1 and the second row L2).
- a nickel film is formed on the surfaces of the side walls of the holding shafts 14a to 14j, for example, by applying nickel plating.
- the holding shafts 14a to 14j may be made of nickel.
- the connecting board 16 has long bar portions 16a and 16b extending in parallel to one another, and short bar portions 17 bridged between the approximate middle portions of these long bar portions 16a and 16b, and therefore, substantially H-shaped Make a shape.
- the coupling board 16 having such a shape is extremely light in weight as compared to a flat plate. That is, by forming the connecting board 16 in a substantially H-shape, it is possible to further reduce the weight of the connecting board 16 and thus the transport rack 10.
- a substantially C-shape is formed by approximately half of the long bar portions 16 a and 16 b and the short bar portion 17. In other words, two substantially C-shaped openings are formed in the coupling plate 16.
- a holding shaft inserting recess 34 is formed on the lower surface of the connecting disc 16 at a position corresponding to the holding shaft inserting recess 22 in the base 12, while the connecting pin inserting hole 26 in the base 12 is formed on the upper surface.
- the connecting pin fixing hole 36 is formed at a position corresponding to the position of.
- bolt insertion holes 38 are formed through the upper end surface of the coupling board 16 to the holding shaft insertion concave portions 34. The upper end portions of the holding shafts 14a to 14j are connected to the connecting disc 16 by bolts 40 inserted into the holding shaft insertion recesses 34 and inserted into the bolt insertion holes 38.
- connection pin 42 having a screw formed on the side wall is screwed into the connection pin fixing hole 36.
- the connection pins 42 are inserted into the connection pin insertion holes 26 of the base 12 that constitutes the upper transport rack 10.
- the transport rack 10 according to the first embodiment is basically configured as described above, and next, regarding the function and effect of the metal rings R1 and R2 implemented using the transport rack 10 It will be described in relation to the heat treatment method.
- the metal rings R1 and R2 are held by the holding shafts 14a to 14j as the first row L1 and the second row L2.
- the holding shafts 14a to 14j are provided in advance on the base 12 via the bolts 28 inserted into the bolt insertion holes 24, respectively.
- the metal rings R1 and R2 are produced, for example, by cutting a cylindrical drum made of maraging steel into a predetermined width, and have an elastic restoring force against a pressing force. That is, when released from the pressing force, it returns to its original shape by its elastic action.
- a plurality of metal rings R1 configured in this way are gripped by a gripping device (not shown) from the outer peripheral wall side.
- a gripping force pressing force
- the metal ring R1 is held by the holding device in a state of being deformed into an elliptical shape or a substantially hexagonal shape.
- this deformation takes place within the elastic range of the metal ring R1.
- the plurality of metal rings R1 deformed into an elliptical shape or the like are transferred between the holding shafts 14a to 14e and 14j.
- the gripping device stops at a position where each of the metal rings R1 is disposed between the protrusions 30 adjacent in the height direction of the holding shafts 14a to 14e and 14j.
- each metal ring R1 is interposed between the protrusions 30 of the holding shafts 14a to 14e and 14j, and as a result, as shown in FIG. 2, the plurality of metal rings R1 are held as the first row L1. It is simultaneously held in 14a to 14e and 14j.
- the gripping device simultaneously grips the plurality of metal rings R2 and deforms into an elliptical shape or the like as described above, and in this state, transfers the metal rings R2 between the holding shafts 14e to 14j.
- all the metal rings R2 are gripped by the gripping device after the gripping device is stopped at a position where each of the metal rings R2 is disposed between the protrusions 30 of the holding shafts 14e to 14j in the same manner as described above. It is released simultaneously from the force. With this release, all the metal rings R2 return to a substantially perfect circular shape, and the outer walls thereof intervene between the protrusions 30 of the holding shafts 14e to 14j. Thereby, the metal rings R2 are held by the holding shafts 14e to 14j as the second row L2.
- the metal rings R1 and R2 are held in a staggered state to avoid interference with each other.
- the lower end surface of the metal ring R ⁇ b> 1 (R ⁇ b> 2) is in contact with the tapered reduced diameter portion 32 in the protrusion 30. Since the tapered reduced diameter portion 32 is a curved surface, the lower end surface of the metal ring R1 (R2) is in point contact with the tapered reduced diameter portion 32 at a point where the symbol x is attached. That is, the metal ring R1 (R2) and the protrusion 30 are in point contact with each other.
- the projection 30 located on the upper end face side of the metal ring R1 (R2) is omitted for convenience, and only the lower end face side is described in detail, but the metal ring R1 (R2) Similarly, the upper end surface of the upper surface 30 is in point contact with the tapered reduced diameter portion 32 of the projection 30.
- the upper end portions of the holding shafts 14a to 14j are inserted into the holding shaft insertion concave portions 34 formed on the lower surface of the coupling plate 16. Thereafter, as shown in FIG. 7, upper end portions of the holding shafts 14a to 14j are connected to the connecting board 16 via the bolt 40 inserted into the bolt insertion hole 38 (note that FIG. 7 shows the base 12).
- FIG. 7 shows the base 12
- the illustration of the metal rings R1 and R2 is omitted). Furthermore, the connection pin 42 is screwed into the connection pin fixing hole 36 as necessary.
- connection plate 16 is connected to the holding shafts 14a to 14j, whereby the holding shafts 14a to 14j are inclined, and the inclination prevents the metal rings R1 and R2 from coming off the holding shafts 14a to 14j. .
- each upper end of the holding shafts 14a to 14j erected on the base 12 The metal rings R1 and R2 may be held by the holding shafts 14a to 14j after the coupling plate 16 is coupled to the part. In this case, the metal rings R1 and R2 may be inserted between two adjacent ones of the holding shafts 14a to 14j.
- the metal rings R1 and R2 may be gripped while being deformed into a substantially hexagonal shape within the elastic range by a gripping device (not shown).
- a gripping device not shown.
- the metal rings R1 and R2 are released from the holding device, the metal rings R1 and R2 restored by the elastic force are held by the holding shafts 14a to 14j.
- the metal rings R1 and R2 are transported together with the transport rack 10 to the inside of the heat treatment furnace 80 shown in FIG. 8 under the action of a transfer not shown.
- the large circular openings 18a and 18b and the small circular openings 20a and 20b are formed through the base 12 of the transport rack 10, while the coupling board 16 is substantially H-shaped. . Therefore, the transport rack 10 is lightweight compared to a transport rack having a flat base and a coupling board.
- the two central holding shafts 14e and 14i simultaneously hold both the first row L1 of the metal ring R1 and the second row L2 of the metal ring R2, an increase in the number of holding shafts is avoided. .
- the weight of the holding shafts 14a to 14j and hence the transport rack 10 can be greatly reduced.
- the transport rack 10 can be transported easily. In addition, it is possible to save power and the like required for transportation.
- the heat treatment furnace 80 is formed long along the transport direction of the transport rack 10, and heaters 86 and 88 are installed inward of the side walls 82 and 84, and a convection fan 92 is installed on the ceiling wall 90. It is configured.
- the transport rack 10 supported by the transfer via the mounting jig 94 is carried into the heat treatment furnace 80 together with the mounting jig 94.
- a nitriding gas such as ammonia, for example, is supplied into the heat treatment furnace 80 shown in FIG.
- the nitriding gas is raised to a predetermined temperature capable of nitriding the metal rings R1, R2 under the action of the heaters 86, 88, for example, about 500.degree.
- the metal rings R1 and R2 receive radiant heat and cause thermal expansion so as to approach the holding shafts 14a to 14j.
- the lower end surface and the upper end surface of the metal rings R1 and R2 are held in point contact with the protrusion 30 (see FIG. 6 for the lower end surface). Therefore, the restraint force of the protrusion 30 on the metal rings R1 and R2 is small. For this reason, the metal rings R1 and R2 can be thermally expanded without being blocked by the protrusions 30.
- the nitriding gas whose temperature has risen rises toward the ceiling wall 90 of the heat treatment furnace 80 (see FIG. 8).
- the convective fan 92 is driven to rotate the stirring blade 96 so that the nitriding gas is convected in the heat treatment furnace 80. Therefore, the nitriding gas descends along the side wall and then tries to rise again in the vicinity of the mounting jig 94 and thus the transport rack 10.
- the lower end surface and the upper end surface of the metal rings R1 and R2 are in point contact with the protrusion 30. That is, the contact area between the metal rings R1 and R2 and the protrusion 30 is extremely small. Therefore, the nitriding gas sufficiently flows around the contact portion between the metal rings R1 and R2 and the protrusion 30.
- the nitriding gas is in contact with substantially the entire metal rings R1 and R2.
- the temperature of the metal rings R1 and R2 becomes substantially uniform throughout. In other words, the temperature of the contact point between the holding shafts 14a to 14j and the metal rings R1 and R2 is substantially equal to the temperature of the other parts of the metal rings R1 and R2.
- nitriding proceeds substantially equally throughout the metal rings R1 and R2. That is, the occurrence of variations in the progress of nitriding is avoided, and therefore, the occurrence of variations in the thickness of the nitrided layer and hence the degree of curing is also avoided.
- the temperatures of the metal rings R1 and R2 are substantially equal throughout
- the nitriding gas can be brought into contact with substantially all of the metal rings R1 and R2. Accordingly, the metal rings R1 and R2 can be nitrided substantially uniformly throughout and thereby substantially uniformly cured.
- the nickel film is formed on the surface of the side walls of the holding shafts 14a to 14j, diffusion of the constituent elements of the holding shafts 14a to 14j to the metal rings R1 and R2 is avoided during the nitriding treatment. . That is, the nickel film functions as a barrier to diffusion of the constituent elements of the holding shafts 14a to 14j into the metal rings R1 and R2.
- the transport rack 10 is led out from the heat treatment furnace 80. Thereafter, the nut 48 is loosened, and the connecting plate 16 is removed from the holding shafts 14a to 14j to expose the metal rings R1 and R2.
- the exposed metal rings R1 and R2 are gripped by the gripping device and removed from the holding shafts 14a to 14j in a state of being deformed into an elliptical shape or the like and transported to a predetermined station or storage place.
- the metal rings R1 and R2 released from the gripping device return to a substantially perfect circular shape under the action of their own elasticity.
- the transport rack 10 including the holding shafts 14a to 14j manufactured as described above is repeatedly used.
- FIG. 8 shows the case where the transport rack 10 is carried into the heat treatment furnace 80 without being stacked, but when using a heat treatment furnace having a large capacity, as shown in FIG. 9 and FIG.
- the transport racks 10 may be stacked via the pins 42 and carried into the heat treatment furnace in this state.
- transport racks 10 may be stacked in three or more stages in the same manner.
- a transport rack provided with a holding shaft having a protrusion whose top faces a direction other than the center of the metal ring will be described as a second embodiment.
- the same referential mark is attached
- FIG. 11 is an overall schematic perspective view of the transport rack 210 according to the second embodiment
- FIG. 12 is an overall schematic perspective view showing the transport rack 210 holding the metal rings R1 and R2.
- the transport rack 210 is for holding and transporting a plurality of metal rings R1 as a first row L1 and a plurality of metal rings R2 as a second row L2.
- the base 12 and the base 12 are erected.
- the ten holding shafts 214a to 214j and the connecting plate 16 connected to all the ten holding shafts 214a to 214j.
- the holding shafts 214a to 214j have the same configuration, and the holding shafts 214e and 214j have the same configuration.
- the base 12 has a shape in which a right-angled isosceles triangle is cut out from the long side to the short side of the flat plate, and is thus formed into an octagonal shape.
- large circular openings 18a and 18b and small circular openings 20a and 20b for lightening are formed to penetrate. The formation of the large circular openings 18 a and 18 b and the small circular openings 20 a and 20 b reduces the weight of the base 12 and eventually contributes to the weight reduction of the transport rack 210.
- the centers of the large circular openings 18a and 18b coincide with the centers O1 and O2 of the first row L1 (metal ring R1) and the second row L2 (metal ring R2).
- the base 12 has a holding shaft insertion recess 22, a bolt insertion hole 24 penetrating from the lower surface of the base 12 to the holding shaft insertion recess 22, and two connection pin insertion holes 26. Is formed.
- the lower ends of the holding shafts 214a to 214j are inserted into the holding shaft insertion recess 22 and connected to the base 12 by bolts 28 inserted in the bolt insertion holes 24.
- the holding shafts 214a to 214j are erected on the base 12.
- FIGS. 14 and 15 show a longitudinal sectional view of the main part of the holding shaft 214 e and a schematic perspective view of the main part, respectively.
- the holding shaft 214e is formed as a quadrangular prism, and the holding projections of substantially triangular prism shape on the two short side surfaces (hereinafter, also simply referred to as the protrusions). ) 230 is a formed solid body.
- the holding shaft 214 j has the same configuration as the holding shaft 214 e.
- the remaining holding shafts 214a to 214d and 214f to 214i are configured in compliance with the holding shaft 214e except that the protrusion 230 is formed on only one of the two short side surfaces. There is.
- the holding shafts 214a to 214e and 214j are arranged to surround the first row L1, and the holding shafts 214e to 214j are arranged to surround the second row L2.
- the short side surfaces of the holding shafts 214a to 214j are provided to face away from the centers O1 and O2 of the metal rings R1 and R2, and therefore the tops of all the projecting portions 230 are also the metal rings R1 and R2. It faces away from the centers O1 and O2 of R2 (see arrows in FIGS. 11 and 17).
- each of the substantially triangular prism shaped projections 230 projects from the holding shafts 214a to 214j such that one side (apex) faces the metal rings R1 and R2. For this reason, the projection 230 is formed with an inclined surface 232 directed vertically downward and an inclined surface 233 directed vertically upward as the holding shafts 214a to 214j approach the metal rings R1 and R2.
- the metal rings R1 and R2 are adjacent to the protrusions 230, 230, specifically, the inclined surface 232 of the lower protrusion 230 and the inclined surface of the upper protrusion It is pinched by 233 and.
- the lower end surface of the metal rings R1 and R2 is placed on the inclined surface 232 of the protrusion 230 located below the metal rings R1 and R2, the inclined surface 233 of the protrusion 230 located above and the metal ring R1 , And R2 may be separated from each other.
- the holding shafts 214a to 214j having such shapes can be manufactured, for example, by forming the projection 230 by cutting a solid square pole from the outer wall side.
- the quadrangular prism and the projection 230 are manufactured as separate members, and for example, a screw hole is formed on the short side surface of the quadrangular prism while a screw is formed on the bottom of the projection 230
- the screwed round rod may be provided, and the screwed round rod may be screwed into the screw hole.
- the holding shafts 214a to 214j are erected on the base 12 such that the positions of the protrusions 230 coincide with each other. Therefore, the metal ring R1 is interposed between the protrusions 230 of the holding shafts 214a to 214e and 214j, and the metal ring R2 is interposed between the protrusions 230 of the holding shafts 214e to 214j. That is, among the holding shafts 214a to 214j, the two holding shafts 214e and 214j hold both of the metal rings R1 and R2 (first row L1 and second row L2).
- a nickel film is formed on the surfaces of the side walls of the holding shafts 214a to 214j, for example, by applying nickel plating.
- the holding shafts 214a to 214j may be made of nickel instead of forming a nickel film.
- the connecting board 16 has long bar portions 16a and 16b extending in parallel to one another, and short bar portions 17 bridged between the approximate middle portions of these long bar portions 16a and 16b, and therefore, substantially H-shaped Make a shape.
- the coupling board 16 having such a shape is extremely light in weight as compared to a flat plate. That is, by forming the connecting board 16 in a substantially H-shape, it is possible to further reduce the weight of the connecting board 16 and hence the transport rack 210.
- a substantially C-shape is formed by approximately half of the long bar portions 16 a and 16 b and the short bar portion 17. In other words, two substantially C-shaped openings are formed in the coupling plate 16.
- a holding shaft inserting recess 34 is formed on the lower surface of the connecting disc 16 at a position corresponding to the holding shaft inserting recess 22 in the base 12, while the connecting pin inserting hole 26 in the base 12 is formed on the upper surface.
- the connecting pin fixing hole 36 is formed at a position corresponding to the position of.
- bolt insertion holes 38 are formed through the upper end surface of the coupling board 16 to the holding shaft insertion concave portions 34. The upper end portions of the holding shafts 214a to 214j are connected to the coupling disc 16 by bolts 40 which are inserted into the holding shaft insertion recesses 34 and are inserted into the bolt insertion holes 38.
- connection pin 42 having a screw formed on the side wall is screwed into the connection pin fixing hole 36. As described later, when stacking the transport racks 210, the connection pin 42 is inserted into the connection pin insertion hole 26 of the base 12 that constitutes the upper transport rack 210.
- the transport rack 210 according to the second embodiment is basically configured as described above, and next, regarding the function and effect of the metal rings R1 and R2 implemented using the transport rack 210. It will be described in relation to the heat treatment method.
- the metal rings R1 and R2 are held by the holding shafts 214a to 214j as the first row L1 and the second row L2.
- the holding shafts 214a to 214j are provided in advance on the base 12 via the bolts 28 inserted into the bolt insertion holes 24, respectively.
- the metal rings R1 and R2 are produced, for example, by cutting a cylindrical drum made of maraging steel into a predetermined width, and have an elastic restoring force against a pressing force. That is, when released from the pressing force, it returns to its original shape by its elastic action.
- a plurality of metal rings R1 configured in this way are gripped by a gripping device (not shown) from the outer peripheral wall side.
- a gripping force pressing force
- the metal ring R1 is held by the holding device in a state of being deformed into an elliptical shape or a substantially hexagonal shape.
- this deformation takes place within the elastic range of the metal ring R1.
- the plurality of metal rings R1 deformed into an elliptical shape or the like are transferred between the holding shafts 214a to 214e and 214j.
- the gripping device stops at a position where each of the metal rings R1 is disposed between the protrusions 230 adjacent in the height direction of the holding shafts 214a to 214e and 214j.
- the metal rings R1 are simultaneously released from the gripping force by the gripping device, and in response to this, the metal rings R1 return to the original substantially round shape by the elastic restoring force.
- the metal rings R1 are interposed between the protrusions 230 of the holding shafts 214a to 214e and 214j, and as a result, as shown in FIG. 12, the plurality of metal rings R1 are held as the first row L1. It is simultaneously held in 214a to 214e, 214j.
- the gripping device simultaneously grips the plurality of metal rings R2 and deforms into an elliptical shape or the like as described above, and in this state, transfers the metal rings R2 between the holding shafts 214e to 214j.
- all the metal rings R2 are gripped by the gripping device after the gripping device is stopped at a position where each of the metal rings R2 is disposed between the protruding portions 230 of the holding shafts 214e to 214j as described above. It is released simultaneously from the force.
- all the metal rings R2 return to a substantially perfect circular shape, and the outer walls thereof intervene between the protrusions 230 of the holding shafts 214e to 214j.
- the metal rings R2 are held by the holding shafts 214e to 214j as the second row L2.
- the metal rings R1 and R2 are held in a staggered state to avoid interference with each other.
- the lower end surface of the metal ring R1 (R2) is in contact with the inclined surface 232 of the protrusion 230.
- the lower end surface of the metal ring R1 (R2) is a portion where the symbol X is attached to the inclined surface 232, since the top of the projection 230 faces in the direction away from the center O1 (O2) of the metal ring R1 (R2) Contact only at (dots). That is, the metal ring R1 (R2) and the protrusion 230 are in point contact with each other.
- the projection 230 located on the upper end face side of the metal ring R1 (R2) is omitted, and only the lower end face side is described in detail.
- the upper end surface of the) is in point contact with the inclined surface 233 of the projection 230 located above it.
- the upper end portions of the holding shafts 214a to 214j are inserted into the holding shaft inserting concave portions 34 formed on the lower surface of the coupling plate 16. Thereafter, as shown in FIG. 17, the upper end portions of the holding shafts 214a to 214j are connected to the connecting board 16 via the bolt 40 inserted into the bolt insertion hole 38 (note that FIG. 17 shows the base 12).
- the illustration of the metal rings R1 and R2 is omitted). Furthermore, the connection pin 42 is screwed into the connection pin fixing hole 36 as necessary.
- the metal rings R1 and R2 and the transport rack 210 are in the state shown in FIG.
- the connecting disc 16 By connecting the connecting disc 16 to the holding shafts 214a to 214j, the holding shafts 214a to 214j are inclined, and the inclination prevents the metal rings R1 and R2 from coming off the holding shafts 214a to 214j. .
- each upper end of the holding shafts 214a to 214j erected on the base 12 The metal rings R1 and R2 may be held by the holding shafts 214a to 214j after the connecting plate 16 is connected to the part. In this case, the metal rings R1 and R2 may be inserted between two adjacent ones of the holding shafts 214a to 214j.
- the metal rings R1 and R2 may be gripped while being deformed into a substantially hexagonal shape within the elastic range by a gripping device (not shown).
- a gripping device not shown.
- the metal rings R1 and R2 are released from the holding device, the metal rings R1 and R2 restored by the elastic force are held by the holding shafts 14a to 14j.
- the metal rings R1 and R2 are transported together with the transport rack 210 to the inside of the heat treatment furnace 80 shown in FIG. 18 under the action of a transfer not shown.
- the large circular openings 18a and 18b and the small circular openings 20a and 20b are formed through the base 12 of the transport rack 210, while the coupling board 16 is substantially H-shaped. . Therefore, the transport rack 210 is lightweight compared to a transport rack having a flat base and a coupling board.
- the central two holding shafts 214e and 214i simultaneously hold both the first row L1 of the metal ring R1 and the second row L2 of the metal ring R2, an increase in the number of holding shafts is avoided. .
- the weight of the holding shafts 214a to 214j and hence the transport rack 210 can be greatly reduced.
- the transport rack 210 can be transported easily. In addition, it is possible to save power and the like required for transportation.
- the heat treatment furnace 80 is formed long along the transport direction of the transport rack 210, and heaters 86 and 88 are installed inward of the side walls 82 and 84, and a convection fan 92 is installed on the ceiling wall 90. It is configured.
- the transport rack 210 supported by the transfer via the mounting jig 94 is carried into the heat treatment furnace 80 together with the mounting jig 94.
- a nitriding gas such as ammonia is supplied into the heat treatment furnace 80 shown in FIG.
- the nitriding gas is raised to a predetermined temperature capable of nitriding the metal rings R1, R2 under the action of the heaters 86, 88, for example, about 500.degree.
- the metal rings R1 and R2 receive radiant heat and cause thermal expansion so as to approach the holding shafts 214a to 214j.
- the lower end surface and the upper end surface of the metal rings R1 and R2 are held in point contact with the protrusion 230 (see FIG. 16 for the lower end surface). Therefore, the restraint force of the protrusion 230 on the metal rings R1 and R2 is small. For this reason, the metal rings R1 and R2 can be thermally expanded without being blocked by the protrusions 230.
- the suppression of the thermal expansion of the metal rings R1 and R2 can be avoided. Therefore, the concern that distortion will occur in the metal rings R1 and R2 is eliminated.
- the nitriding gas whose temperature has risen rises toward the ceiling wall 90 of the heat treatment furnace 80 (see FIG. 18).
- the convective fan 92 is driven to rotate the stirring blade 96 so that the nitriding gas is convected in the heat treatment furnace 80. Therefore, the nitriding gas descends along the side wall, and then tries to rise again in the vicinity of the mounting jig 94 and thus the transport rack 210.
- the lower end surface and the upper end surface of the metal rings R1 and R2 are in point contact with the protrusion 230. That is, the contact area between the metal rings R1 and R2 and the projection 230 is extremely small. Therefore, the nitriding gas sufficiently flows around the contact portion between the metal rings R1 and R2 and the protrusion 230.
- the nitriding gas contacts substantially the entire metal rings R1 and R2.
- the temperature of the metal rings R1 and R2 becomes substantially uniform throughout. In other words, the temperature of the contact point between the holding shafts 214a to 214j and the metal rings R1 and R2 is substantially equal to the temperature of the other parts of the metal rings R1 and R2.
- nitriding proceeds substantially equally throughout the metal rings R1 and R2. That is, the occurrence of variations in the progress of nitriding is avoided, and therefore, the occurrence of variations in the thickness of the nitrided layer and hence the degree of curing is also avoided.
- the metal rings R1 and R2 are the same as in the first embodiment.
- the metal rings R1 and R2 can be brought into contact with substantially the whole of the metal rings R1 and R2. Accordingly, the metal rings R1 and R2 can be nitrided substantially uniformly throughout and thereby substantially uniformly cured.
- the nickel film functions as a barrier to diffusion of the constituent elements of the holding shafts 214a to 214j into the metal rings R1 and R2.
- the transport rack 210 is led out from the heat treatment furnace 80. Thereafter, the nut 48 is loosened, and the coupling plate 16 is removed from the holding shafts 214a to 214j to expose the metal rings R1 and R2.
- the exposed metal rings R1 and R2 are gripped by the gripping device and removed from the holding shafts 214a to 214j in a state of being deformed into an elliptical shape or the like and transported to a predetermined station or storage place.
- the metal rings R1 and R2 released from the gripping device return to a substantially perfect circular shape under the action of their own elasticity.
- the transport rack 210 including the holding shafts 214a to 214j manufactured as described above is repeatedly used.
- FIG. 18 shows the case where the transport rack 210 is carried into the heat treatment furnace 80 without being stacked, but when the heat treatment furnace having a large capacity is used, as shown in FIG. 19 and FIG.
- the transport racks 210 and 210 may be stacked via the pins 42 and carried into the heat treatment furnace in this state.
- transport racks 210 may be stacked in three or more stages in the same manner.
- the connecting board 16 is used.
- the transport rack may be configured by only the base 12 and the holding shafts 214a to 214j.
- the metal rings R1 and R2 are held as the first row L1 and the second row L2 by ten holding shafts 214a to 214j.
- at least the holding shafts are at least one. Four is enough.
- metal rings R1 and R2 that become belts for CVT as workpieces are illustrated and nitriding processing is illustrated as the processing, workpieces and heat treatments are not particularly limited to these.
- a carburizing gas may be supplied instead of the above-mentioned nitriding gas.
- the metal rings R1 and R2 are not particularly required to be held between the adjacent protrusions 230 and 230, and as described above, with respect to the inclined surface 232 of the protrusions 230 located below the metal rings R1 and R2.
- the lower end surface of the lever may be point-contacted and supported by only this point-contact.
- the projection 230 it is only necessary for the projection 230 to have an inclined surface 232 directed vertically downward, and there is no particular need for the inclined surface 233 to be present. That is, for example, the lower end may be a projection provided so as to be orthogonal to the holding shafts 214a to 214j.
- the protrusion in the second embodiment is not particularly limited to the protrusion 230 formed of a triangular prism-shaped body having an inclined surface 232, and a truncated cone or a cone whose top faces the metal rings R1 and R2. It may be a shaped body.
- FIG. 21 shows a main portion of a holding shaft which is formed of a conical body and has a projection 252 having a tapered reduced diameter portion 250.
- the directions of the short side surfaces of the holding shafts 214a to 214j are set so that the tops of the protrusions 252 deviate from the centers O1 and O2 of the metal rings R1 and R2 (see FIG. 11).
- the metal rings R 1 and R 2 point-contact with the tapered reduced diameter portion 250 of the protrusion 252.
- a transport rack having a holding shaft on which a projecting portion made of a cylindrical body is formed will be described as a third embodiment.
- the same referential mark is attached
- FIG. 22 is an overall schematic perspective view of the transport rack 310 according to the third embodiment
- FIG. 23 is an overall schematic perspective view showing the transport rack 310 holding the metal rings R1 and R2.
- the transport rack 310 is for holding and transporting the plurality of metal rings R1 as the first row L1 and the plurality of metal rings R2 as the second row L2.
- the base 312 and the base 312 stand upright.
- the ten holding shafts 314a to 314j and the connecting disc 316 connected to all the ten holding shafts 314a to 314j.
- the holding shafts 314a to 314j In the holding shafts 314a to 314j, the holding shafts 314a to 314d and 314f to 314i have the same configuration, and the holding shafts 314e and 314j have the same configuration.
- the base 312 has a shape in which a right-angled isosceles triangle is cut out from the long side to the short side of the flat plate, and is thus formed into an octagonal shape.
- large circular openings 18a and 18b and small circular openings 20a and 20b for lightening are formed to penetrate.
- the formation of the large circular openings 18 a and 18 b and the small circular openings 20 a and 20 b reduces the weight of the base 312, which ultimately contributes to the weight reduction of the transport rack 310.
- the base 312 has a holding shaft insertion recess 22, a bolt insertion hole 24 penetrating from the lower surface of the base 312 to the holding shaft insertion recess 22, and two connection pin insertion holes 26. Is formed.
- the lower ends of the holding shafts 314a to 314j are inserted into the holding shaft insertion recess 22 and are connected to the base 312 by the bolts 28 inserted in the bolt insertion holes 24.
- the holding shafts 314 a to 314 j are erected on the base 312.
- FIG. 25 and FIG. 26 the principal part longitudinal cross-sectional view of the holding shaft 314e and the principal part schematic perspective view are shown, respectively.
- the holding shaft 314e is formed as a quadrangular prism, and has a substantially cylindrical mounting protrusion 330 and a locking protrusion 332 on the two short side surfaces. Is a medium entity in which a plurality of
- the holding shaft 314 j has the same configuration as the holding shaft 314 e. Further, the remaining holding shafts 314a to 314d and 314f to 314i are provided with the mounting protrusion 330 and the blocking protrusion 332 formed on only one of the two short side surfaces, It is comprised according to the holding shaft 314e.
- the mounting projections 330 of the holding shafts 314a to 314d and 314f to 314i are provided such that the top surfaces thereof are directed to the centers of the metal rings R1 and R2.
- the mounting projections 330 of the holding shafts 314 e and 314 j extend such that the top surfaces thereof are oriented in the longitudinal direction of the base 312 and face the metal rings R 1 and R 2.
- each mounting protrusion 330 is excessively large, the circumferential length of the mounting protrusion 330 becomes large, and the mounting protrusion 330 causes line contact with the metal rings R1 and R2. It will be. In order to avoid this, in the third embodiment, the diameter of each mounting projection 330 is set to a point contact with the metal rings R1 and R2.
- the hooking projections 332 are also formed as a cylindrical body, and the hooking projections 332 are disposed between the mounting projections 330 and 330 adjacent to each other. Further, the axial direction (dimension in the height direction) extending toward the metal rings R1 and R2 of the blocking projections 332 is set smaller than the mounting projections 330.
- the metal rings R1 and R2 are inserted between the adjacent mounting projections 330 and 330, but the mounting projections with their lower end surfaces located below It is only placed in a point contact state at 330, and the upper end face is separated from the mounting projection 330 located at the upper side. That is, the metal rings R1 and R2 do not abut on the mounting projection 330 positioned above.
- the side walls of the metal rings R1 and R2 are in contact with the top surfaces of the locking projections 332.
- the metal rings R1 and R2 press the blocking projection 332 toward the holding shafts 314a to 314j by the expansion force.
- the metal rings R1 and R2 are slightly shrunk inward in the diameter direction by being pressed from the respective holding projections 332 of the holding shafts 314a to 314j, and elastically deform to return to the original diameter. It is blocked by the blocking projection 332 in a state where a force (expansion force) is applied.
- the holding shafts 314a to 314j having such shapes can be manufactured, for example, by forming the mounting projections 330 by cutting a solid square pole from the outer wall side.
- the quadrangular prism body and the mounting protrusion 330 are manufactured as separate members, and for example, a screw hole is formed on the short side surface of the quadrangular prism while the mounting protrusion 330 is A screwing round rod having a screw portion formed on the bottom surface may be provided, and the screwing round rod may be screwed into the screw hole.
- the holding shafts 314a to 314j are erected on the base 312 such that the positions of the mounting projections 330 and the blocking projections 332 coincide with each other. Accordingly, the lower end surface of the metal ring R1 is mounted on the mounting projections 330 of the holding shafts 314a to 314e and 314j, and the metal ring R2 is mounted on the mounting projections 330 of the holding shafts 314e to 314j. Be placed. That is, among the holding shafts 314a to 314j, the two holding shafts 314e and 314j hold both of the metal rings R1 and R2 (the first row L1 and the second row L2).
- the blocking projections 332 provided on the holding shafts 314a to 314j abut the side walls of the metal rings R1 and R2.
- the diameter of the imaginary circle connecting the top surfaces of the locking projections 332 is smaller than the diameter of the metal rings R1 and R2, and therefore, the metal rings R1 and R2 are pressed by the locking projections 332 to have a diameter The direction is contracted slightly inward.
- a nickel film is formed on the surfaces of the side walls of the holding shafts 314a to 314j, for example, by applying nickel plating.
- the holding shafts 314a to 314j may be made of nickel.
- the connecting plate 316 has long bar portions 316a and 316b extending in parallel to one another, and short bar portions 317 bridged between the approximate middle portions of these long bar portions 16a and 16b, and therefore, substantially H-shaped Make a shape.
- the coupling disk 316 having such a shape is significantly lighter than a flat plate. That is, by forming the connecting board 316 in a substantially H-shape, it is possible to further reduce the weight of the connecting board 316 and hence the transport rack 310.
- a substantially C-shape is formed by approximately half of the long bar portions 316a and 316b and the short bar portion 317. In other words, two substantially C-shaped openings are formed in the coupling plate 316.
- a holding shaft inserting recess 34 is formed on the lower surface of the connecting plate 316 at a position corresponding to the holding shaft inserting recess 22 in the base 312, while the connecting pin inserting hole 26 in the base 312 is formed on the upper surface.
- the connecting pin fixing hole 36 is formed at a position corresponding to the position of.
- bolt insertion holes 38 are formed through the upper end surface of the coupling plate 316 to the holding shaft insertion recess 34.
- the upper end portions of the holding shafts 314a to 314j are connected to the coupling disc 316 by bolts 40 which are inserted into the holding shaft insertion recesses 34 and are inserted into the bolt insertion holes 38.
- connection pin 42 having a screw formed on the side wall is screwed into the connection pin fixing hole 36. As described later, when stacking the transport racks 310, the connection pin 42 is inserted into the connection pin insertion hole 26 of the base 312 which constitutes the upper transport rack 310.
- the transport rack 310 according to the third embodiment is basically configured as described above, and next, regarding the function and effect of the metal rings R1 and R2 implemented using the transport rack 310. It will be described in relation to the heat treatment method.
- the metal rings R1 and R2 are held by the holding shafts 314a to 314j as the first row L1 and the second row L2.
- the holding shafts 314a to 314j are provided in advance on the base 312 via the bolts 28 inserted into the bolt insertion holes 24, respectively.
- the metal rings R1 and R2 are produced, for example, by cutting a cylindrical drum made of maraging steel into a predetermined width, and have an elastic restoring force against a pressing force. That is, when released from the pressing force, it returns to its original shape by its elastic action.
- a plurality of metal rings R1 configured in this way are gripped by a gripping device (not shown) from the outer peripheral wall side.
- a gripping force pressing force
- the metal ring R1 is held by the holding device in a state of being deformed into an elliptical shape or a substantially hexagonal shape.
- this deformation takes place within the elastic range of the metal ring R1.
- the plurality of metal rings R1 deformed into an elliptical shape or the like are transferred between the holding shafts 314a to 314e and 314j.
- the gripping device stops at a position where each of the metal rings R1 is disposed between the mounting projections 330 adjacent in the height direction of the holding shafts 314a to 314e, 314j.
- each metal ring R1 is mounted in the projection part 330 for mounting located in the downward direction.
- the side wall of the metal ring R1 abuts on the blocking projection 332.
- the diameter of the imaginary circle connecting the top surfaces of the blocking projections 332 formed on the holding shafts 314a to 314e and 314j is smaller than the diameter of the metal ring R1. For this reason, the metal ring R1 is pressed from the blocking projection 332 and slightly contracted inward in the diameter direction.
- the plurality of metal rings R1 are simultaneously held by the holding shafts 314a to 314e and 314j as the first row L1.
- the gripping device simultaneously grips the plurality of metal rings R2 and deforms into an elliptical shape or the like as described above, and in this state, transfers the metal rings R2 between the holding shafts 314e to 314j.
- the holding device is stopped at the position where each of the metal rings R2 is disposed between the mounting projections 330 of the holding shafts 314e to 314j, all the metal rings R2 are held by the holding It is simultaneously released from the gripping force by the device. Along with this release, all the metal rings R2 return to a substantially perfect circular shape.
- each metal ring R2 is placed on the mounting projection 330 located below it, and at the same time, as shown in FIG.
- the side wall of the metal ring R2 abuts on the blocking projection 332 and is pressed from the blocking projection 332 so that it is slightly contracted radially inward.
- the metal rings R2 are held by the holding shafts 314e to 314j as the second row L2.
- the metal rings R1 and R2 are held in a staggered state to avoid interference with each other.
- the diameter of the mounting protrusion 330 is set to a size that allows point contact with the metal rings R1 and R2. Therefore, as shown in FIG. 27, the lower end surface of the metal ring R1 (R2) makes point contact with the curved side wall of the mounting protrusion 330 at the point where the symbol x is attached. That is, the metal ring R1 (R2) and the mounting protrusion 330 are in point contact with each other.
- the blocking projection 332 presses and holds the metal rings R1 and R2 in a state in which the expansion force is generated (see FIG. 28). Therefore, the mounting projection 330 is not the main role for holding the metal rings R1 and R2, but an auxiliary role for preventing the metal rings R1 and R2 from falling vertically downward. It can be For this reason, the contact area of metal ring R1, R2 and the projection part 330 for mounting can be made as small as possible.
- the upper end portions of the holding shafts 314a to 314j are inserted into the holding shaft inserting concave portions 34 formed on the lower surface of the coupling plate 316. Thereafter, as shown in FIG. 29, the upper end portions of the holding shafts 314a to 314j are connected to the connecting plate 316 via the bolt 40 inserted into the bolt insertion hole 38 (note that FIG. 29 shows the base 312).
- FIG. 29 shows the base 3112.
- the illustration of the metal rings R1 and R2 is omitted. Furthermore, the connection pin 42 is screwed into the connection pin fixing hole 36 as necessary.
- connection disc 316 is connected to the holding shafts 314a to 314j, whereby the holding shafts 314a to 314j are inclined, and the inclination prevents the metal rings R1 and R2 from coming off the holding shafts 314a to 314j.
- each upper end of the holding shafts 314a to 314j erected on the base 312 The metal rings R1 and R2 may be held by the holding shafts 314a to 314j after the coupling plate 316 is coupled to the part. In this case, the metal rings R1 and R2 may be inserted between two adjacent ones of the holding shafts 314a to 314j.
- the metal rings R1 and R2 may be gripped while being deformed into a substantially hexagonal shape within the elastic range by a gripping device (not shown).
- a gripping device (not shown).
- the gripping device is inserted from the substantially C-shaped opening in the connecting disc 316 Do.
- the metal rings R1 and R2 are released from the holding device, the metal rings R1 and R2 restored by the elastic force are held by the holding shafts 314a to 314j.
- the metal rings R1 and R2 are transported together with the transport rack 310 to the inside of the heat treatment furnace 80 shown in FIG. 30 under the action of a transfer not shown.
- the large circular openings 18a and 18b and the small circular openings 20a and 20b are formed through the base 312 of the transport rack 310, while the coupling plate 316 is substantially H-shaped. . Therefore, the transport rack 310 is lightweight compared to a transport rack having a flat base and a coupling board.
- the two central holding shafts 314e and 314i simultaneously hold both the first row L1 of the metal ring R1 and the second row L2 of the metal ring R2, an increase in the number of holding shafts is avoided. .
- the weight of the holding shafts 314a to 314j and hence the transport rack 310 can be greatly reduced.
- the transport rack 310 can be transported easily. In addition, it is possible to save power and the like required for transportation.
- the heat treatment furnace 80 is formed long along the transport direction of the transport rack 310, and heaters 86 and 88 are installed inward of the side walls 82 and 84, and a convection fan 92 is installed on the ceiling wall 90. It is configured.
- the transport rack 310 supported by the transfer via the mounting jig 94 is carried into the heat treatment furnace 80 together with the mounting jig 94.
- a nitriding gas such as ammonia is supplied into the heat treatment furnace 80 shown in FIG. 30, for example.
- the nitriding gas is raised to a predetermined temperature capable of nitriding the metal rings R1, R2 under the action of the heaters 86, 88, for example, about 500.degree.
- the metal rings R1 and R2 receive radiant heat and cause thermal expansion so as to approach the holding shafts 314a to 314j.
- the lower end surfaces of the metal rings R1 and R2 are held in point contact with the mounting protrusion 330 (see FIG. 6). Therefore, the restraining force of the mounting protrusion 330 with respect to the metal rings R1 and R2 is small. For this reason, the metal rings R1 and R2 can be thermally expanded without being blocked by the mounting protrusion 330.
- the suppression of the thermal expansion of the metal rings R1 and R2 can be avoided. Therefore, the concern that distortion will occur in the metal rings R1 and R2 is eliminated.
- the metal rings R1 and R2 are in point contact with the mounting protrusion 330, the contact area between them is small. Therefore, the amount of heat taken from the mounting projections 330 for the metal rings R1 and R2 is small. That is, the contact between the metal rings R1 and R2 and the mounting protrusion 330 is made point contact, and heat is transmitted from the metal rings R1 and R2 to the mounting protrusion 330 by reducing the contact area between each other. Can be suppressed.
- the metal rings R1 and R2 are easily heated. In other words, it is easy to raise the temperature to a temperature at which nitriding proceeds sufficiently.
- the nitriding gas whose temperature has risen rises toward the ceiling wall 90 of the heat treatment furnace 80 (see FIG. 30).
- the convection fan 92 is driven to rotate the agitating blades 96, thereby causing the nitriding gas to be convected in the heat treatment furnace 80. Therefore, the nitriding gas descends along the side wall and then tries to rise again in the vicinity of the mounting jig 94 and thus the transport rack 310.
- the lower end surfaces of the metal rings R1 and R2 are in point contact with the mounting projection 330 located below them. That is, the contact area between the metal rings R1 and R2 and the mounting protrusion 330 is extremely small. Therefore, the nitriding gas sufficiently flows around the contact portion between the metal rings R1 and R2 and the mounting protrusion 330.
- the nitriding gas contacts substantially the entire metal rings R1 and R2.
- the temperature of the metal rings R1 and R2 becomes substantially uniform throughout. In other words, the temperature of the contact point between the holding shafts 314a to 314j and the metal rings R1 and R2 is substantially equal to the temperature of the other parts of the metal rings R1 and R2.
- nitriding proceeds substantially equally throughout the metal rings R1 and R2. That is, the occurrence of variations in the progress of nitriding is avoided, and therefore, the occurrence of variations in the thickness of the nitrided layer and hence the degree of curing is also avoided.
- the temperatures of the metal rings R1 and R2 are all over It can be made substantially equivalent, and the nitriding gas can be brought into contact with substantially the whole of the metal rings R1, R2. Accordingly, the metal rings R1 and R2 can be nitrided substantially uniformly throughout and thereby substantially uniformly cured.
- the nickel film is formed on the surface of the side walls of the holding shafts 314a to 314j, diffusion of the constituent elements of the holding shafts 314a to 314j to the metal rings R1 and R2 is avoided during the nitriding treatment. . That is, the nickel film functions as a barrier to diffusion of the constituent elements of the holding shafts 314a to 314j into the metal rings R1 and R2.
- the transport rack 310 is led out from the heat treatment furnace 80. Thereafter, the nut 48 is loosened, and the coupling plate 316 is removed from the holding shafts 314a to 314j to expose the metal rings R1 and R2.
- the exposed metal rings R1 and R2 are gripped by the gripping device and removed from the holding shafts 314a to 314j in a state of being deformed into an elliptical shape or the like and transported to a predetermined station or storage place.
- the metal rings R1 and R2 released from the gripping device return to a substantially perfect circular shape under the action of their own elasticity.
- the transport rack 310 including the holding shafts 314a to 314j manufactured as described above is repeatedly used.
- FIG. 30 shows the case where the transport rack 310 is carried into the heat treatment furnace 80 without being stacked, but when using a heat treatment furnace having a large capacity, as shown in FIG. 31 and FIG.
- the transport racks 310 and 310 may be stacked via the pins 42 and carried into the heat treatment furnace in this state.
- transport racks 310 may be stacked in three or more stages in the same manner.
- each of the holding shafts 314a to 314j, 214a to 214j, 314a to 314j is inserted into the holding shaft inserting concave portion 22 formed in the base 12, 312 and held.
- the bolts 28 passed through the bolt insertion holes 24 are screwed into the bolt holes formed at the lower ends of the shafts 14a to 14j, 214a to 214j, 314a to 314j, whereby the holding shafts 14a to 14j, 214a to 214j, It is arranged to stand on the base 12, 312 in a state of positioning and fixing 314 a to 314 j (see FIG. 5, FIG. 15, FIG. 25). You may do so.
- this case will be described as a fourth embodiment. Note that, in the following, components having the same reference symbols as the reference symbols attached to the components shown in FIGS. 22 to 32 indicate that they are the same components. Therefore, the detailed description is omitted.
- FIG. 33 is a plan cross-sectional view of the transport rack 400 according to the fourth embodiment as viewed from the side of the base 402 forming the transport rack 400. As shown in FIG. Here, in FIG. 33, in order to clarify the positional relationship between the holding shafts 404a to 404j and the long hole bolt insertion holes 406a and 406b formed in the base 402, the base 402 is shown by a virtual line and long. The hole-shaped bolt insertion holes 406a and 406b are indicated by solid lines.
- the transport rack 400 has ten retaining shafts 404a to 404j arranged in the same manner as the retaining shafts 314a to 314j in the transport rack 310 according to the third embodiment. Then, the first row L3 (a plurality of metal rings R3) is held by six of the holding shafts 404a to 404e and 404j, and the second row L4 (a plurality of metal rings R4 is formed by six of the holding shafts 404e to 404j). Hold).
- the two holding shafts 404e and 404j have the same configuration as that of each of the holding shafts 314e and 314j in the third embodiment, but different reference numerals are given in the fourth embodiment for convenience of explanation.
- the two holding shafts 404e and 404j simultaneously holding the first row L1 and the second row L4 are the same as the holding shafts 314e and 314j in the third embodiment are connected to the base 312 via the bolts 28, It is connected to the base 402 via a bolt 28. That is, the holding shafts 404e and 404j are positioned and fixed by being connected to the base 402 by the same configuration as that shown in FIG.
- the remaining holding shafts 404a to 404d and 404f to 404i can be displaced so that the top surfaces of the respective mounting projections 330 approach or move away from the centers of the metal rings R3 and R4. It is set up.
- FIG. 34 which is a longitudinal cross-sectional view in the vicinity of one end portion of the holding shaft 404a, in the portion of the base 402 where the holding shaft 404a is erected, two long hole shaped bolt insertion holes 406a. 406b and a seating step 408 which is continuous with the elongated bolt insertion holes 406a and 406b and is slightly wider.
- bottomed bolt holes 410a and 410b are formed in the holding shaft 404a at positions overlapping with the long hole bolt insertion holes 406a and 406b, respectively.
- the long bolt insertion holes 406a and 406b can be threaded through the screw portions 414a and 414b of the holding bolts 412a and 412b, but are set narrower than the heads 416a and 416b. Therefore, when the screw portions 414a and 414b of the holding bolts 412a and 412b inserted into the long hole shaped bolt insertion holes 406a and 406b from the seating step portion 408 side are screwed into the bolt holes 410a and 410b, the head portion 416a, 416 b is seated on the seating step 408. By this seating, the further movement of the clamping bolts 412a and 412b is suppressed.
- the base 402 is firmly held between the heads 416a and 416b of the holding bolts 412a and 412b and the holding shaft 404a.
- the holding shaft 404a is positioned and fixed.
- the position shown in FIG. 34 corresponds to the position shown by the solid line in FIG.
- the holding shaft 404a is at a position at a maximum distance from the center of the metal ring R3. In other words, the holding shaft 404a is located at the reverse end.
- the holding shafts 404b to 404d and 404f to 404i are similarly positioned and fixed to the base 402. Therefore, as easily understood from FIG. 33, the diameters of the inscribed circle formed by the holding shafts 404a to 404e and 404j and the inscribed circle formed by the holding shafts 404e to 404j become maximum.
- the clamping bolts 412a and 412b are loosened, and the heads 416a and 416b of the clamping bolts 412a and 412b are separated from the seating step 408.
- the holding bolts 412a and 412b release the base 402 so that the holding shafts 404a to 404d and 404f to 404i can be displaced.
- the holding shafts 404a to 404d and 404f to 404i are displaced in a direction (advance end) approaching each other.
- the diameters of the inscribed circle formed by the holding shafts 404a to 404e and 404j and the inscribed circle formed by the holding shafts 404e to 404j are reduced. That is, the holding shafts 404a to 404d and 404f to 404i are displaced in the direction in which the diameter of the inscribed circle decreases.
- the clamping bolts 412a and 412b are retightened in the position shown in FIG. 35, that is, at the end (advancing end) of the long hole bolt insertion holes 406a and 406b, and the heads 416a and 416b of the clamping bolts 412a and 412b.
- the base 402 While being seated on the seating step 408, the base 402 is held between the heads 416a and 416b and the holding shafts 404a to 404j.
- the holding shafts 404a to 404d and 404f to 404i are positioned and fixed at the forward end.
- the holding shafts 404a to 404e and 404j may hold the first row L5, and the holding shafts 404e to 404j may hold the second row L6.
- the metal rings R3 and R4 and the metal rings R5 and R6 have various diameters. It is possible to hold the metal ring.
- the longitudinal direction dimensions of the long hole bolt insertion holes 406a and 406b according to the diameter of the metal ring R3 (R4) and the diameter of the metal ring R5 (R6).
- the measurement of the displacement distance of the holding shafts 404a to 404d and 404f to 404i is not performed each time until the diameter of the metal ring R3 (R4) and the appropriate position according to the diameter of the metal ring R5 (R6) This is because the holding shafts 404a to 404d and 404f to 404i can be displaced.
- the holding shafts 404a to 404d and 404f to 404i are positioned and fixed between the forward end position and the reverse end position, smaller in diameter than the metal rings R3 and R4, and larger in diameter than the metal rings R5 and R6. Needless to say, the metal ring may be held.
- the transport rack 400 is heated to a high temperature.
- This heat transfer causes the transport rack 400 to thermally expand, but in this case, the vicinity of the holding shafts 404e and 404j tends to expand more than the vicinity of the holding shafts 404a to 404d and 404f to 404i.
- the reason is that the holding shafts 404a to 404d and 404f to 404i hold only one of the first row L3 and the second row L4, whereas the holding shafts 404e and 404j have the first row L3 and the second row L4. It is inferred that in the holding shafts 404e and 404j, the amount of heat transferred from the metal rings R3 and R4 is larger than that of the holding shafts 404a to 404d and 404f to 404i. Ru.
- the base 402 and the coupling plate 316 sandwiching the holding shafts 404a to 404i may be bent so as to approach each other as they are closer to the end apart from the holding shafts 404e and 404j.
- the bending of the base 402 and the connecting plate 316 in this manner causes the holding shafts 404a to 404d and 404f to 404i to be firmly sandwiched by the base 402 and the connecting plate 316.
- holding shafts 404a to 404d and 404f to 404i are provided. Need to be displaced in the direction in which they approach each other. However, as described above, these holding shafts 404a to 404d and 404f to 404i are not easy to displace because they are held (restrained) by the base 402 and the coupling plate 316 bent so as to approach each other. .
- the dimensions in the height direction (axial dimension) of the holding shafts 404a to 404d and 404f to 404i are preferably smaller than the holding shafts 404e and 404j.
- the height dimension may be smaller as it is farther from the holding shafts 404e and 404j.
- FIG. 36 omits illustration of the metal rings R3 and R4 for the sake of easy understanding, and exaggerates differences in dimension in the height direction.
- the base 402 and the coupling plate 316 warp in the direction in which the holding shafts 404a to 404d and 404f to 404i are separated.
- the holding shafts 404a to 404d and 404f to 404i are released from the restraints of the base 402 and the coupling plate 316, so that the holding shafts 404a to 404d and 404f to 404i can be easily displaced.
- FIG. 37 shows the bolt 40 detached from the holding shafts 404a to 404d and 404f to 404i
- the holding shafts 404a to 404d and 404f to 404i are released from the restraint of the base 402 and the connecting plate 316. It is sufficient to loosen the bolt 40 to such an extent that it is not necessary to release it.
- the bolts 28 (see FIGS. 25 and 33) and the bolts 40 (see FIG. 22) are not loosened. Inevitably, there is no need to retighten the bolts 28, 40 to the holding shafts 404e, 404j. In this manner, the operation time for relaxation and retightening can be shortened by the amount by which the restraints of the base 402 and the coupling plate 316 with respect to the holding shafts 404e and 404j are not released.
- the position of the bolt insertion hole 38 (see FIG. 22) of the connection plate 316 and the position of the bolt holes formed on the tip end surfaces of the holding shafts 404a to 404d and 404f to 404i remain substantially matched.
- the holding shafts 404e and 404j are connected to the base 402 and the connection plate 316, it is possible to prevent the bolt insertion hole 38 and the bolt holes from being misaligned. Therefore, the operation time required for alignment can also be shortened.
- the dimension in the height direction of the holding shafts 404e and 404j for holding both of the two rows of metal rings R3 and R4 is either the metal ring R3 (R5) or the metal ring R4 (R6)
- the holding shafts 404a to 404d and 404f to 404i larger than the holding shafts 404a to 404d holding only one of them, it becomes easy to displace the holding shafts 404a to 404d and 404f to 404i, and the metal rings R3 and R4 can be set. It is possible to shorten the time from the release to the holding of the metal rings R5 and R6. Therefore, the processing efficiency of the metal rings R5 and R6 can be improved.
- the holding shafts 404 e and 404 j may also be set so as to be displaceable relative to the base 402.
- elongated bolt insertion holes 406a and 406b, and a seating step 408 (FIG. 34) in the portions of the base 402 where the holding shafts 404e and 404j are erected. And FIG. 35) may be formed.
- the screw portions 414a and 414b of the holding bolts 412a and 412b are screwed into the bolt holes 410a and 410b formed at the lower ends of the holding shafts 404e and 404j, and the head portions 416a and 416b are seated on the seating step 408 And the holding shafts 404 e and 404 j may hold the base 402. Thus, the holding shafts 404e and 404j are positioned and fixed.
- the base 402 When displacing the holding shafts 404e and 404j, the base 402 may be released by loosening the holding bolts 412a and 412b as described above.
- the metal ring R7 (first row L7) held by the holding shafts 404a to 404e and 404j and the metal ring R8 held by the holding shafts 404e to 404j It is possible to select two rows L8) having different diameters.
- the holding shafts 404a to 404j may be positioned and fixed between the forward end position and the reverse end position, if necessary.
- the metal rings R3 to R8 in the state in which the expansion force is generated are held by the blocking projections 332 while being pressed. Therefore, also in the fourth embodiment, as in the third embodiment, the effect of being able to avoid the occurrence of distortion in the metal rings R3 to R8 during the heat treatment can be obtained.
- the metal rings R1 to R8 may be held between the adjacent mounting protrusions 330, 330. Even in this case, the amount of heat transfer from the metal rings R1 to R8 to the mounting protrusion 330 is minimized by making the contact between the metal rings R1 to R8 and the mounting protrusions 330, 330 point contact. Can be suppressed.
- the bases 12, 312 and 402 and the holding shafts 14a to 14j, 214a to 214j, 314a to 314j, 404a to 404j are used without using the connecting plate 16, 316.
- the transport rack may be configured with only one.
- ten of the holding shafts 14a to 14j, 214a to 214j, 314a to 314j, and 404a to 404j include two of the metal rings R1 to R8 in the first row L1, Although two rows of the second row L2 are held, at least four holding shafts are sufficient for holding two rows as described above.
- the metal rings R1 to R8 which become belts for CVT are illustrated as the work and the nitriding treatment is exemplified as the treatment, the work and the heat treatment are not particularly limited thereto.
- a carburizing gas may be supplied instead of the above-mentioned nitriding gas.
- the holding shafts 14a to 14j, 214a to 214j, 314a to 314j, and 404a to 404j may be hollow bodies.
- the transport racks 10, 210, 310, 400 can be further reduced in weight.
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Abstract
Description
基盤と、
前記基盤に立設されて互いに平行に延在するとともに、その側壁に、前記金属リングの下端面に当接する突起部が複数個設けられた複数本の保持軸と、
を備え、
前記突起部は、前記金属リングの下端面に対して点接触で当接する搬送ラックが提供される。
前記突起部を、前記金属リングの下端面に対して点接触で当接させる金属リングの保持方法が提供される。
前記搬送ラックを構成する基盤に立設されて互いに平行に延在するとともに、水平方向断面が多角形状である柱状部材であり且つその側面の1つが前記金属リングに臨み、さらに、前記金属リングに臨む前記側面にのみ突起部が複数個設けられた複数本の保持軸に対し、前記金属リングの下端面を前記突起部に点接触させることで該金属リングを前記搬送ラックに保持する工程と、
前記金属リングを前記搬送ラックごと熱処理炉に搬入し、熱処理を施す工程と、
を有する金属リングの熱処理方法が提供される。
Claims (20)
- 弾性復元力を有する複数個の金属リング(R1、R2)を保持して搬送するための搬送ラック(10)であって、
基盤(12)と、
前記基盤(12)に立設されて互いに平行に延在するとともに、その側壁に、前記金属リング(R1、R2)の下端面に当接する突起部(30)が複数個設けられた複数本の保持軸(14a~14j)と、
を備え、
前記突起部(30)は、前記金属リング(R1、R2)の下端面に対して点接触で当接することを特徴とする搬送ラック(10)。 - 請求項1記載の搬送ラック(10)において、前記保持軸(14a~14j)は、水平方向断面が多角形状である柱状部材であり、且つその側面の1つが前記金属リング(R1、R2)に臨み、
前記金属リング(R1、R2)に臨む前記側面にのみ、前記突起部(30)が設けられていることを特徴とする搬送ラック(10)。 - 請求項1又は2記載の搬送ラック(10)において、前記突起部(30)は、前記金属リング(R1、R2)が接触する部位が該金属リング(R1、R2)に接近するに従ってテーパー状に縮径するテーパー状縮径部であるものであることを特徴とする搬送ラック(10)。
- 請求項1又は2記載の搬送ラック(10)において、前記突起部(230)は、前記金属リング(R1、R2)に接近するにつれて鉛直下方に向かう傾斜面(232)を有し且つ該傾斜面(232)が前記金属リング(R1、R2)の下端面に当接する三角柱形状体であり、
前記突起部(30)が、その頂部が前記金属リング(R1、R2)の中心(O1、O2)以外の方向に臨むことを特徴とする搬送ラック(10)。 - 請求項1又は2記載の搬送ラック(10)において、前記突起部(330)が円柱形状体として形成され、且つその直径が、前記金属リング(R1、R2)に対して点接触する寸法に設定されることを特徴とする搬送ラック(10)。
- 請求項1~5のいずれか1項に記載の搬送ラック(10)において、さらに、前記保持軸(314a~314j)に突出形成され、且つ隣接する前記突起部(330)同士の間に介在されて前記金属リング(R1、R2)の側壁に当接することで該金属リング(R1、R2)をその直径方向内方に押圧する堰止用突起部(332)を備えることを特徴とする搬送ラック(10)。
- 請求項1~6のいずれか1項に記載の搬送ラック(10)において、前記複数本の保持軸(14a~14j)が、前記金属リング(R1、R2)を2列以上に縦列配置した状態で保持可能に配置されていることを特徴とする搬送ラック(10)。
- 請求項1~7のいずれか1項に記載の搬送ラック(10)において、前記基盤(12)から離間して配置され、且つ全ての前記保持軸(14a~14j)の端部が連結された連結盤(16)をさらに有することを特徴とする搬送ラック(10)。
- 請求項1~8のいずれか1項に記載の搬送ラック(10)において、前記保持軸(14a~14j)がニッケル又はニッケル基合金からなるものであるか、又は、その表面にニッケル又はニッケル基合金の皮膜が形成されたものであることを特徴とする搬送ラック(10)。
- 請求項1~9のいずれか1項に記載の搬送ラック(400)において、前記複数本の保持軸(404a~404j)の中の少なくとも一部が、該保持軸(404a~404j)同士によって形成される内接円の直径が大きくなる方向又は小さくなる方向に変位可能に前記基盤(402)に立設されていることを特徴とする搬送ラック(400)。
- 請求項10記載の搬送ラック(400)において、前記複数本の保持軸(404a~404j)が、前記金属リング(R1、R2)を2列以上に縦列配置した状態で保持可能に配置され、且つ前記基盤(402)から離間して配置されて前記複数本の保持軸(404a~404j)の端部が連結された連結盤(316)をさらに有するとともに、隣接する2列の前記金属リング(R1、R2)の双方を保持する保持軸(404e、404j)が位置決め固定される一方、1列の前記金属リング(R1、R2)のみを保持する保持軸(404a~404d、404f~404i)が変位可能とされ、且つ位置決め固定された前記保持軸(404e、404j)の軸線方向寸法が、変位可能である前記保持軸(404a~404d、404f~404i)に比して大きく設定されることを特徴とする搬送ラック(400)。
- 請求項10記載の搬送ラック(400)において、前記複数本の保持軸(404a~404j)の全てが変位可能であることを特徴とする搬送ラック(400)。
- 請求項8~12のいずれか1項に記載の搬送ラック(10)において、前記連結盤(16)は、互いに平行に延在する2本の長バー部と、前記長バー部同士を連結する1本の短バー部とを有する略H字形状体であり、且つ前記2本の長バー部は、その先端が互いに接近することで略C字形状をなすことを特徴とする搬送ラック(10)。
- 弾性復元力を有する複数個の金属リング(R1、R2)に対して熱処理を施すために、基盤(12)に立設されて互いに平行に延在する複数本の保持軸(14a~14j)を具備するとともに、前記保持軸(14a~14j)の側壁に、前記金属リング(R1、R2)の下端面に当接する突起部(30)が複数個設けられた搬送ラック(10)で前記金属リング(R1、R2)を保持する金属リング(R1、R2)の保持方法であって、
前記突起部(30)を、前記金属リング(R1、R2)の下端面に対して点接触で当接させることを特徴とする金属リング(R1、R2)の保持方法。 - 請求項14記載の保持方法において、前記保持軸(14a~14j)を、水平方向断面が多角形状である柱状部材として設けるとともに、その側面の1つを前記金属リング(R1、R2)に臨ませ、
前記突起部(30)を、前記金属リング(R1、R2)に臨む前記側面にのみ設けて、前記金属リング(R1、R2)の下端面に当接させることを特徴とする金属リング(R1、R2)の保持方法。 - 請求項14又は15記載の保持方法において、前記保持軸(314a~314j)として、隣接する前記突起部(330)同士の間に堰止用突起部(332)がさらに設けられたものを用い、前記堰止用突起部(332)を前記金属リング(R1、R2)の側壁に当接させることを特徴とする金属リング(R1、R2)の保持方法。
- 請求項14~16のいずれか1項に記載の保持方法において、前記複数本の保持軸(404a~404j)の中の少なくとも一部を、該保持軸(404a~404j)同士によって形成される内接円の直径が大きくなる方向又は小さくなる方向に変位させることを特徴とする金属リング(R1、R2)の保持方法。
- 請求項17記載の保持方法において、前記複数本の保持軸(404a~404j)を、前記金属リング(R1、R2)を2列以上に縦列配置した状態で保持可能に配置し、且つ前記基盤(402)から離間して配置されて前記複数本の保持軸(404a~404j)の端部が連結された連結盤(316)を設けるとき、隣接する2列の前記金属リング(R1、R2)の双方を保持する保持軸(404e、404j)を位置決め固定する一方、1列の前記金属リング(R1、R2)のみを保持する保持軸(404a~404d、404f~404i)を変位可能とし、且つ位置決め固定された前記保持軸(404e、404j)の軸線方向寸法を、変位可能である前記保持軸(404a~404d、404f~404i)に比して大きく設定し、
変位可能である前記保持軸(404a~404d、404f~404i)のみを前記基盤(402)に対する拘束から解放した後に変位させることを特徴とする金属リング(R1、R2)の保持方法。 - 請求項18記載の保持方法において、前記複数本の保持軸(404a~404j)の全てを変位させることを特徴とする金属リング(R1、R2)の保持方法。
- 弾性復元力を有する複数個の金属リング(R1、R2)を搬送ラック(10)で保持した状態で熱処理を施す金属リング(R1、R2)の熱処理方法であって、
前記搬送ラック(10)を構成する基盤(12)に立設されて互いに平行に延在するとともに、水平方向断面が多角形状である柱状部材であり且つその側面の1つが前記金属リング(R1、R2)に臨み、さらに、前記金属リング(R1、R2)に臨む前記側面にのみ突起部(30)が複数個設けられた複数本の保持軸(14a~14j)に対し、前記金属リング(R1、R2)の下端面を前記突起部(30)に点接触させることで該金属リング(R1、R2)を前記搬送ラック(10)に保持する工程と、
前記金属リング(R1、R2)を前記搬送ラック(10)ごと熱処理炉(80)に搬入し、熱処理を施す工程と、
を有することを特徴とする金属リング(R1、R2)の熱処理方法。
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EP10813771.2A EP2505675A4 (en) | 2009-09-02 | 2010-09-02 | TRANSPORT SUPPORT, METAL RING RETENTION METHOD, AND THERMAL HEAT TREATMENT METHOD OF THE METAL RING |
US13/390,745 US8998004B2 (en) | 2009-09-02 | 2010-09-02 | Conveyance rack, method for retaining metal ring, and method for heat treatment of metal ring |
DE112010003545.8T DE112010003545B4 (de) | 2009-09-02 | 2010-09-02 | Transportgestell, Verfahren zurn Festhalten eines Metallringsund Verfahren zur Wärmebehandlung des Metallrings |
CN201080038898.1A CN102639724B (zh) | 2009-09-02 | 2010-09-02 | 传送架、用于保持金属环的方法 |
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JP2009202998A JP5290093B2 (ja) | 2009-09-02 | 2009-09-02 | 搬送ラック |
JP2009203004A JP5290094B2 (ja) | 2009-09-02 | 2009-09-02 | 搬送ラック |
JP2009-203004 | 2009-09-02 | ||
JP2009203008 | 2009-09-02 | ||
JP2009-203008 | 2009-09-02 | ||
JP2009-202998 | 2009-09-02 | ||
JP2010082969 | 2010-03-31 | ||
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JP2010-104881 | 2010-04-30 | ||
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US9073098B2 (en) * | 2012-05-16 | 2015-07-07 | Asml Netherlands B.V. | Light collector mirror cleaning |
US20170110353A1 (en) * | 2015-10-20 | 2017-04-20 | Taiwan Semiconductor Manufacturing Co., Ltd. | Wafer boat, annealing tool and annealing method |
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EP2505675A1 (en) | 2012-10-03 |
US8998004B2 (en) | 2015-04-07 |
CN102639724A (zh) | 2012-08-15 |
CN102639724B (zh) | 2013-11-06 |
DE112010003545T5 (de) | 2012-09-27 |
DE112010003545B4 (de) | 2014-07-31 |
EP2505675A4 (en) | 2013-10-23 |
US20120148968A1 (en) | 2012-06-14 |
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