JP5378851B2 - Metal ring drawing method and drawing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for pulling out metal rings from an alignment stocker capable of automatically executing the heat treatment of a large amount of the metal rings. <P>SOLUTION: In the method, the metal ring is pulled out from spaces of a plurality of shelf members having an opening part in which the total of the length of ridges thereof is larger than the length of an outer circumference of each metal ring, and provided parallel to each other at the predetermined spacing in the vertical direction, preventing a fore end of the metal ring in the pulling-out direction from being raised when a rear end in the pulling-out direction of the metal ring passes above the opening part. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for automatically and massively heat treating a metal ring in an endless metal belt used in a continuously variable transmission (CVT) or the like.

  A continuously variable transmission used as a transmission for an automobile or the like includes an endless belt-like metal belt that is wound around a pair of pulleys. This endless belt-like metal belt uses a pair of laminated metal rings obtained by laminating a plurality of endless belt-like metal rings having different circumferential lengths in the thickness direction, and by engaging these pair of laminated metal rings from the width direction, This is a configuration in which a large number of plate-like elements are arranged in an annular shape in the thickness direction.

  Said metal ring is manufactured as follows. First, both ends of a thin plate of a steel material such as maraging steel or stainless steel are welded so as to be cylindrical. At this time, since a part of the steel material is hardened by the heat of welding, the cylindrical steel material is solutionized and homogenized. Next, this solution-formed cylindrical steel material is cut into a predetermined width to form an endless belt-like ring, and then rolled to a predetermined thickness. Since the metal structure is deformed by the rolling, the rolled ring is again formed into a solution to recrystallize the metal structure. After that, the solution ring is corrected to a predetermined peripheral length, and metal rings with different peripheral lengths are manufactured little by little, and further, aging treatment and nitriding treatment are performed to improve hardness and wear resistance. .

  As the nitriding treatment, there are known a gas nitriding method, a gas soft nitriding method, a salt bath nitriding method, and the like for holding a metal ring in a predetermined atmosphere for a predetermined time. In this gas nitriding method or gas soft nitriding method, it is preferable that the entire metal ring is exposed to the atmosphere, whereby the metal ring is uniformly nitrided.

  In such a nitriding treatment of a metal ring, a jig is used that can hold a large number of metal rings and nitride them at a time. Specifically, a metal ring nitriding jig for suspending a metal ring in a vertical direction from the inner peripheral surface side to a pair of upper and lower suspension means has been reported (for example, see Patent Document 1). However, in this nitriding jig, since the metal ring is suspended, the metal ring is unstable in the heating furnace, and the filling rate of the metal ring in the heating furnace is low. There was a problem that the weight of the hitting jig was large and the thermal efficiency during heat treatment was poor. Furthermore, there is a problem that the load is concentrated on the metal ring that is in contact with the upper suspension means, and deformation of the metal ring occurs when nitriding is performed.

  Also, a frame that can be inserted in the radial direction of the metal ring is provided, and the metal ring is pressed from the outer peripheral surface side and held in an elliptical shape by a plurality of holding members provided in the frame. A nitriding jig for a metal ring has been reported (for example, see Patent Document 2). However, even in this nitriding jig, since the metal ring is held in an elliptical shape in the vertical direction, problems such as deformation of the metal ring due to nitriding have not been solved. In addition, the above-described deformation and the like may be corrected together with the correction of the peripheral length in the peripheral length correction process. However, when the deformation or the like is large, in order to correct this deformation together with the correction of the peripheral length. There is a problem that it takes too much time.

  Therefore, to solve this problem, three or more parallel rods are erected in the vertical direction, and a number of double conical ring seats protruding in the horizontal direction are provided on the rods. A metal ring transport rack has been reported in which a metal ring is sandwiched from an outer peripheral surface side into a V-shaped recess formed by an inclined surface of an adjacent ring seat when a ring is inserted (for example, Patent Documents). 3).

  However, since the attachment and removal of the metal rings to and from the transport rack are all performed manually, a large amount of time is required to attach or remove a large amount of metal rings, and the number of production is limited. In addition, even if the metal ring mounting and removal operations are automated in the conventional technology as described above, if each metal ring is processed one by one, it takes a long time to finish processing all of the large number of metal rings. As a result, it was necessary to limit the number of production or increase the number of devices.

JP 2002-161314 A Japanese Patent No. 4219186 JP 2008-240085 A

  Accordingly, in view of the above problems, an object of the present invention is to provide a metal ring drawing method and a drawing device from an alignment stocker that can automatically and massively heat-treat a metal ring.

  The method for pulling out the metal ring of the present invention includes an opening having a longer total length of sides than the outer periphery of the metal ring, and between the plurality of shelf members provided in parallel and at a constant interval in the vertical direction. A method for pulling out the metal ring, wherein the metal ring is prevented from being lifted when the rear end of the metal ring in the drawing direction passes over the opening.

Further, pull-out device of the metal ring of the present invention, an alignment stocker comprises a ring transfer table, and a ring out mechanism, the alignment stocker has a plurality of shelf members are supported in parallel and regular intervals, the A moving means for moving the shelf member in the vertical direction so as to be flush with the ring delivery table, the shelf member has an opening having a total length of sides longer than the outer periphery of the metal ring , The ring pull-out mechanism includes a workpiece drop prevention member disposed so as to cover the upper surface of the end portion of the metal ring, and a workpiece hook that is disposed at the tip end portion of the workpiece drop prevention member and hooks on the inner peripheral surface of the metal ring. provided, is characterized in that to draw out the metal ring to the ring transfer table from the shelf member of said alignment stocker.

  According to the present invention, it is possible to automatically extract a large amount of metal rings from the alignment stocker, thereby realizing an automatic and large amount of heat treatment of the metal rings. In addition, when comparing the polygon and the circle, when the circumference is the same, the area of the shape formed by each of the circles is larger than the polygon, the shelf member of the alignment stocker, An opening corresponding to the shape deformed and clamped by the alignment ring transfer robot hand is provided to realize loading and unloading from above.

It is a conceptual diagram which shows one Embodiment of the automatic heat processing method of the metal ring using the pulling-out method of the metal ring of this invention. It is the front view which showed one Embodiment of the alignment stocker in this invention. It is the top view which showed one Embodiment of the alignment stocker in this invention. It is the conceptual diagram which showed arrangement | positioning with the opening part and metal ring of the alignment stocker in this invention. It is sectional drawing which showed the pushing process of the metal ring to an alignment stocker. It is the top view which showed the pushing process of the metal ring to the alignment stocker. It is the top view which showed the pushing process of the metal ring to the alignment stocker. It is the front view which showed one Embodiment of the alignment ring transfer robot hand. It is the bottom view which showed one Embodiment of the alignment ring transfer robot hand. It is the bottom view which showed the state which inserted the alignment ring transfer robot hand in the metal ring. It is the bottom view which showed the state which expanded the alignment ring transfer robot hand in a metal ring. It is a top view which shows one Embodiment of the heat processing jig | tool of a metal ring. It is a front view which shows one Embodiment of the heat processing jig | tool of a metal ring. It is a top view which shows the state which inserted the metal ring by which the deformation | transformation clamp was carried out to the heat processing jig | tool of a metal ring. It is a top view which shows the state which decompress | restored the deformation | transformation clamp metal ring inserted in the heat processing jig | tool of a metal ring to substantially circular shape. It is sectional drawing which showed the drawing-out process of the metal ring from the alignment stocker in this invention.

  Hereinafter, embodiments of a metal ring automatic heat treatment method using a metal ring drawing method of the present invention and a metal ring drawing device of the present invention will be specifically described with reference to the drawings. FIG. 1 is a conceptual diagram showing an embodiment of a metal ring automatic heat treatment method using the metal ring drawing method of the present invention. In this metal ring automatic heat treatment method, first, as shown in FIG. 1, the metal ring 1 is transferred to the ring delivery table 3 by the metal ring transfer conveyor 2. The metal ring 1 conveyed to the ring delivery table 3 is loaded on the alignment stocker 5 by the ring alignment mechanism 4. The metal rings 1 aligned and loaded on the alignment stocker 5 are transferred and attached to the heat treatment jig 7 by the alignment ring transfer robot hand 6 in this arrangement state.

  Next, the heat treatment jig 7 loaded with the metal ring 1 is stacked on a jig loading pallet 9 by a jig transfer robot 8. This jig loading pallet 9 is conveyed into a heat treatment furnace by a pallet conveyer 10 and a predetermined heat treatment is performed on a large number of loaded metal rings 1.

  And the metal ring 1 which finished heat processing traces the previous process reversely, and is made into one metal ring 1 each. That is, the jig loading pallet 9 after the heat treatment is transported from the heat treatment furnace by the pallet transport conveyor 11. The heat treatment jig 7 stacked on the jig loading pallet 9 is lowered from the jig loading pallet 9 by the jig transfer robot 12. The metal rings 1 aligned and stacked on the heat treatment jig 7 are removed from the heat treatment jig 7 by the alignment ring transfer robot hand 13 in this arrangement state and transferred to the alignment stocker 14.

  Thereafter, the transferred metal ring 1 is pushed out from the alignment stocker 14 by the extrusion cylinder 15, and then pulled out from the alignment stocker 14 onto the ring delivery table 17 by the ring drawing mechanism 16. The drawn metal ring 1 is transported by the metal ring transport conveyor 18. In this way, a large amount of the metal ring 1 is automatically jigged and heat treated. Hereinafter, each of these steps will be described in detail.

1. Metal Ring Alignment Step In this step, the metal ring 1 conveyed to the ring delivery table 3 by the metal ring conveyance conveyor 2 is loaded on the alignment stocker 5 by the ring alignment mechanism 4. Here, the metal ring 1 in the present invention is for welding both ends of a thin plate of a steel material such as maraging steel and stainless steel so as to be cylindrical, and for homogenizing a portion hardened by heat of welding. After solution treatment, the metal ring is cut into a predetermined width to form an endless band-shaped metal ring, and after rolling the metal ring to a predetermined thickness, solution treatment is performed to recrystallize the metal structure. Accordingly, circumference correction is performed. The metal ring 1 has a substantially annular shape when no external force is applied.

The alignment stocker 5 according to the present invention is a structure in which a large number of metal rings can be stacked in a vertical direction and stacked in parallel, and two such configurations can be rotated in parallel. One configuration is shown in FIGS. As shown, a plurality of shelf members 101 are supported at a constant interval in parallel with the upper plate member 102 and the lower plate member 103 by a plurality of support members 104 to 109 between the upper plate member 102 and the lower plate member 103 . . The interval between the plurality of shelf members 101 is substantially equal to the interval between a plurality of metal rings loaded on a heat treatment jig to be described later, and the alignment stocker 5 is configured to move up and down by this interval. The shelf members 101 can be controlled to be at the same height as the ring delivery table 3, whereby the metal rings 1 can be loaded between all the shelf members 101. 2 is a front view showing an embodiment of an alignment stocker according to the present invention, and FIG. 3 is a top view thereof.

  Further, the support members 104 and 109 are separated from the diameter of the metal ring, and the support members 105 to 108 are configured to contact the outer peripheral portion of the metal ring when the metal ring is loaded. Accordingly, when the metal ring is pushed in from the front in FIG. 2 or the lower side in FIG. 3, the metal ring passes between the support members 104 and 109 and is inserted until the outer peripheral portion of the metal ring contacts the support members 105 to 108. .

  Further, the upper plate member 102 and the shelf member 101 are provided with hexagonal openings 110 having a total side length longer than the outer periphery of the metal ring. This opening 110 is used when transferring a metal ring to a heat treatment jig to be described later, and there is no problem when the metal ring is completely inserted, but as shown in FIG. When the metal ring is pushed in from the bottom of the drawing and inserted with a dotted line, a one-dot chain line, and a two-dot chain line, the end of the metal ring opens in the region from the position indicated by the dotted line to the position indicated by the one-dot chain line. There is a problem that it enters into the section 110 at an angle.

  Therefore, in the ring alignment mechanism 4, as shown in FIG. 5, in addition to the cylinder 111 and the work pusher 112 for pushing the metal ring 1 from the ring delivery table 3 into the shelf member 101 of the alignment stocker 5, the above problem A workpiece fall prevention member 113 is provided for solving the above. As shown in FIGS. 5 and 6, the work drop prevention member 113 is configured to be pushed out to the alignment stocker 5 side by the cylinder 111 together with the work pusher 112, and the end of the metal ring 1 with which the work pusher 112 abuts. It arrange | positions so that the upper surface of a part may be covered.

  When the metal ring 1 is pushed into the alignment stocker 5 by the ring alignment mechanism 4, the end of the metal ring 1 tries to enter the opening 110 and is opposite to the end on the opening 110 side. , That is, the end in contact with the work pusher 112 starts to float. However, since the workpiece drop prevention member 113 is provided on the upper surface of the end portion that has started to float, the metal ring 1 end portion is prevented from being lifted, and the metal ring is maintained in a state parallel to the shelf member 101. 1 is pushed between the shelf members 101.

  Thereafter, when the metal ring 1 passes through the region where the end portion enters the opening 110, the workpiece drop prevention member 113 comes into contact with the shelf member 101 as shown in FIGS. Since the member 113 is provided on the cylinder 111 via the spring 114, the movement of the workpiece drop prevention member 113 stops after contacting the shelf member 101, and the outer periphery of the metal ring 1 is supported only by the workpiece pusher 112. It is pushed in until it contacts the members 105-108.

  Then, the alignment stocker 5 moves upward or downward by the interval between the adjacent shelf members 101 so that the shelf member 101 into which the metal ring 1 is not pushed is flush with the ring delivery table 3 in the vertical direction. A moving means for moving the metal ring 1 is pushed into the empty shelf member 101, and a large amount of the metal ring 1 is loaded on the alignment stocker 5 by repeating this operation. Align in the direction. Next, the alignment stocker 5 in which the metal rings are stacked and aligned between all the shelf members 101 as described above is rotated, and a large amount of the metal rings 1 are similarly loaded and aligned in the parallel alignment stocker. Align.

2. Transfer process to heat treatment jig In this process, a large number of metal rings 1 aligned and loaded on the alignment stocker 5 are transferred to the heat treatment jig 7 in this arrangement state by the alignment ring transfer robot hand 6. And attach. As shown in FIGS. 8 and 9, the alignment ring transfer robot hand 6 is provided with finger members 202 that are expanded in three directions by a driving mechanism provided in the base portion 201. Two protrusions 203 are provided on the. FIG. 8 is a front view showing an embodiment of the alignment ring transfer robot hand, and FIG. 9 is a bottom view thereof.

  As shown in FIG. 10, the alignment ring transfer robot hand 6 having such a configuration is formed at the radial center of a large number of substantially circular metal rings 1 aligned in the vertical direction in the alignment stocker 5. The finger members 202 can be inserted vertically from above through the hexagonal openings 110 in the upper plate member 102 and the shelf member 101. Next, by extending the finger members 202 inserted into the center of the metal ring 1 in three directions, as shown in FIG. 11, the protrusions 203 extend outward from the inner peripheral surface of a large amount of the metal ring 1. The metal ring 1 is spread and clamped in a hexagonal shape.

  As described above, since the total sum of the sides of the opening 110 is longer than the outer periphery of the metal ring 1 deformed and clamped in the hexagonal shape, a large amount of the metal ring 1 is clamped. By pulling the finger member 202 upward, all of the aligned large number of metal rings 1 can be taken out at once in the aligned state.

  Moreover, it is preferable to provide a cushion mechanism in the contact part with the metal ring 1 in the projection part 203 of one of the three finger members 202, and thereby the metal ring 1 having a different peripheral length can be provided. Even if it is used, the difference can be absorbed.

  As shown in FIGS. 12 and 13, the heat treatment jig 7 is vertical so that three or more parallel metal ring holding members 303 are in contact with the outer periphery of the metal ring 1 between the lid 301 and the bottom 302. The lid 301 is provided with an opening 304 that is longer in the total length of the sides than the outer periphery of the deformed and clamped metal ring 1. Further, the metal ring holding member 303 is provided with projections 305 at regular intervals only on the surface facing the metal ring 1. The protrusion 305 has an inclined surface. When the outer periphery of the metal ring 1 is inserted between two adjacent protrusions 305, the outer peripheral edge of the metal ring 1 abuts on the inclined surface. It is a configuration. Further, the metal ring holding member 303 is configured such that when three or more of them are erected in parallel, the respective protrusions are formed at the same height, and the metal ring is held between these adjacent protrusions. When 1 is inserted, the metal ring 1 is held horizontally. 12 is a top view showing an embodiment of a heat treatment jig for a metal ring, and FIG. 13 is a front view thereof.

  In the heat treatment jig 7 having such a configuration, as shown in FIG. 14, the finger member having the large number of metal rings 1 clamped as described above is inserted into the opening 304 from above and placed. Alignment is performed so that the outer periphery of the metal ring 1 and the recessed portion of each metal ring holding member 303 to be placed are at the same height. When the finger member is reduced, the shape of the metal ring 1 deformed and clamped in a hexagonal shape is restored to a substantially circular shape by an elastic force, and the outer peripheral edge of the metal ring 1 is made of metal as shown in FIG. It is clamped by the recess of the ring holding member 303, and all of the large number of metal rings 1 are held horizontally at once.

3. Heat treatment step of metal ring In this step, heat treatment jig 7 loaded with a large amount of metal ring 1 is stacked on jig loading pallet 9 by jig transfer robot 8, and this jig loading pallet is moved by pallet conveyor 10. After transporting 9 into the heat treatment furnace, a predetermined heat treatment is performed on the large number of loaded metal rings 1. Here, in the present invention, it is preferable that the jig loading pallet 9 is configured to stack a total of 20 heat treatment jigs 7 in 5 columns, 2 rows and 2 stages. According to such a configuration, the metal in the heating furnace is stacked. The ring filling rate is high, and heat treatment can be performed efficiently at low cost.

4). Metal ring drawing process In this process, after the heat treatment is completed, the jig loading pallet 9 heat-treated by the pallet carrying conveyor 11 is conveyed from the heat treatment furnace, and the heat treatment jig 7 stacked by the jig transfer robot 12 is cured. Remove from the component loading pallet 9. Then, the alignment ring transfer robot hand 13 removes the metal ring 1 aligned and stacked on the heat treatment jig 7 from the heat treatment jig 7 in this arrangement state, and transfers it to the alignment stocker 14. About these operation | movement, since each process of the transfer to the heat processing jig | tool from said alignment stocker and heat processing is traced reversely, detailed description is abbreviate | omitted.

  Next, after the metal ring 1 transferred to the alignment stocker 14 is pushed out of the alignment stocker 14 by the extrusion cylinder 15, the metal ring 1 is pulled out from the alignment stocker 14 onto the ring delivery table 17 by the ring pull-out mechanism 16, and is next processed by the transport conveyor 18. It is conveyed to.

  Here, the drawing process of the metal ring from the alignment stocker in the present invention will be described in more detail. First, as shown in FIG. 1, the metal ring 1 transferred to the alignment stocker 14 is moved by the extrusion cylinder 15. Extrude from alignment stocker 14 Thereby, the edge part of the metal ring 1 can be extruded from between the adjacent shelf members 401 of the alignment stocker 14, and the metal ring 1 in the next process can be pulled out.

Next, the workpiece hook 405 is hooked on the inner peripheral surface of the metal ring 1 pushed out between the adjacent shelf members 401. As shown in FIG. 16A, the ring drawing mechanism 16 is disposed so as to cover the tip surface 402 that contacts the end of the metal ring 1 and the upper surface of the end of the metal ring 1 that contacts. The workpiece drop prevention member 403 is provided, and the cylinder 404 is slidable on the ring delivery table 17 toward the metal ring 1 pushed into the alignment stocker 14. Further, the work drop prevention member 403 is pushed up at the tip end only in the pulling-out direction of the metal ring 1 and passes above the end of the metal ring 1 in the pushed-up state. A claw-like work hook 405 configured to drop inside the ring 1 is provided. Furthermore, the length of the lower surface of the workpiece drop prevention member 403 is longer than the length of the workpiece hook 405, and even when the metal ring 1 is pushed up in the pulling direction, the tip of the workpiece hook 405 and the tip of the ring pulling mechanism The distance from the surface 402 is larger than the thickness of the metal ring 1.

  Then, as shown in FIG. 16 (b), the tip of the ring pulling mechanism 16 is brought close to the end of the metal ring 1 by the cylinder 404, and the workpiece hook 405 is applied to the end of the metal ring 1. When contacted, the workpiece hook 405 is pushed up above the end of the metal ring 1. Further, when the ring pulling mechanism 16 is further brought closer to the metal ring 1 with the workpiece hook 405 being pushed up, as shown in FIG. 16C, the tip of the pushed workpiece hook 405 is moved. Enters the inside of the metal ring 1, then the tip of the work hook 405 falls and the work hook 405 is hooked inside the metal ring 1.

  Thereafter, the metal ring 1 is pulled out to the ring delivery table 14 by moving the ring pulling mechanism 16 in the pulling direction by the cylinder 404. At this time, in the opening provided in the shelf member 401 of the ring alignment stocker 14, As the end of the metal ring 1 tries to enter, the end opposite to the end on the opening side, that is, the end in contact with the front end surface 402 of the ring pull-out mechanism 16 begins to rise. However, since the work drop prevention member 403 is provided on the upper surface of the end portion that has started to float, the metal ring 1 end portion is prevented from being lifted, and the metal ring is maintained in a state parallel to the shelf member 401. 1 is pulled out from between the shelf members 401.

  Next, as shown in FIGS. 16D and 16E, the ring delivery table 14 is configured to be inclined in a direction orthogonal to the pull-out direction. Therefore, by tilting the ring delivery table 14, the workpiece hook 405 is detached from the inside of the metal ring 1, and the metal ring 1 slides down to the metal ring transport conveyor 18 and is transported to the next process by the conveyor 18.

1 ... Metal ring, 2 ... Metal ring conveyor, 3 ... Ring delivery stand,
4 ... Ring alignment mechanism, 5 ... Alignment stocker, 6 ... Alignment ring transfer robot hand,
7 ... Heat treatment jig, 8 ... Jig transfer robot, 9 ... Jig loading pallet 9

Claims (4)

A method of pulling out the metal ring from between a plurality of shelf members provided with an opening having a longer total length of sides than the outer periphery of the metal ring, and provided in parallel and at regular intervals in the vertical direction,
A method of pulling out a metal ring, wherein the metal ring is prevented from being lifted when the rear end of the metal ring in the pull-out direction passes over the opening. An alignment stocker, a ring delivery stand, and a ring pull-out mechanism are provided.
The alignment stocker has a plurality of shelf members supported in parallel and at regular intervals, and includes moving means for moving the shelf members in the vertical direction so as to be flush with the ring delivery table,
The shelf member has an opening having a longer total sum of side lengths than the outer periphery of the metal ring ,
The ring pull-out mechanism includes a workpiece drop prevention member disposed so as to cover the upper surface of the end portion of the metal ring, and a workpiece hook disposed on the tip end portion of the workpiece drop prevention member and hooked on the inner peripheral surface of the metal ring. the equipped, pull-out device of the metal ring, wherein the from the shelf member of said alignment stocker score pull out the metal ring to the ring transfer table.   The workpiece hook is pushed up only in the pulling-out direction of the metal ring, passes above the end of the metal ring in the pushed-up state, and drops to the inside of the metal ring after the end passes. The metal ring drawing device according to claim 2, wherein the metal ring drawing device is provided. The workpiece drop prevention member has a lower surface length longer than the workpiece hook length, and the workpiece hook tip and the ring even in a state in which the workpiece hook is pushed up in the drawing direction of the metal ring. The metal ring drawing device according to claim 3 , wherein the metal ring is spaced apart from the leading end surface of the drawing mechanism to be larger than the thickness of the metal ring.

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