JP5959975B2 - Metal ring manufacturing method and manufacturing apparatus thereof - Google Patents

Description

  The present invention relates to a metal ring manufacturing method and a manufacturing apparatus therefor, in which a metal cylindrical workpiece is cut to obtain a plurality of metal rings.

  As a power transmission belt employed in a continuously variable transmission of an automobile, a laminated ring in which a plurality of metal rings are laminated is used. The metal ring constituting this type of laminated ring is, for example, first held by inserting a workpiece holding member into a cylindrical drum (cylindrical workpiece) formed by welding both end edges of a rectangular metal thin plate. In this state, the cylindrical workpiece is produced by cutting into a circular shape for each predetermined width (see, for example, Patent Document 1).

  By the way, since the drum is formed of a relatively thin metal plate, the drum is likely to be bent by its own weight when it is not held by the holding member. That is, the cross-sectional shape may be elliptical.

  On the other hand, the work holding member is formed in a substantially circular cross section in order to hold the drum in a perfect circle and obtain a metal ring with high accuracy. Therefore, when the drum has an elliptical cross section as described above and its short diameter is smaller than the diameter of the workpiece holding member, the workpiece holding member may interfere with the drum when trying to insert the workpiece holding member into the drum. . At this time, since the insertion operation cannot be performed smoothly, there is a concern that the drum may be damaged in the case of the interference.

  In view of this, the present applicant has proposed a correcting means for correcting the drum into a substantially circular shape in Patent Document 2 so that the workpiece holding member can be smoothly inserted into the drum. Specifically, the straightening means has a pair of straightening members that can be divided and opened and become cylindrical when closed, and the inner diameter when closed closes the drum into a substantially circular shape. The outer diameter is set to be approximately the same as the outer diameter. That is, when the correcting member is divided and opened, and the drum is disposed inside, the drum is closed and the peripheral wall of the drum is pressed by the inner surface of the correcting member. In other words, a load is applied to the drum. When the peripheral length of the drum is within an appropriate range, the drum is corrected to a substantially perfect circle shape by this load, so that the workpiece holding member is smoothly inserted.

JP 2005-297074 A JP 2004-122308 A

  In some cases, after the welding, a solution treatment may be performed for the purpose of improving the quality of the drum. That is, since the drum is manufactured through a heating process such as welding or solution treatment, the diameter, and hence the circumference, varies due to thermal deformation or the like.

  For example, a drum with a large circumference tends to be a vertically long oval even when a load is applied, while a drum with a small circumference tends to be a horizontally long oval. In either case, if the short diameter is smaller than the diameter of the work holding member, it is difficult to insert the work holding member and there is a concern that the drum may be damaged.

  That is, there is a problem that it is not easy to correct all the drums into a substantially circular shape only by applying a constant load to drums having various circumferential lengths (diameters).

  The present invention has been made to solve the above-described problems, and it is possible to correct the drum into a substantially perfect circle shape. For this purpose, the work holding member can be smoothly inserted into the drum. In addition, an object of the present invention is to provide a metal ring manufacturing method and a manufacturing apparatus capable of efficiently obtaining a highly accurate metal ring.

In order to achieve the above-described object, the present invention provides a metal ring for obtaining a metal ring by mounting a metal drum having a corrected shape on the outer peripheral surface of a work holding member and then cutting it along the circumferential direction. A method,
By bringing a pair of correction members close to each other, the drum is held between the recesses formed in each of the correction members, and a correction load is applied to the drum so that the drum approaches a perfect circle shape. Correcting, and
Inserting the workpiece holding member into the corrected through-hole of the drum;
Cutting the drum mounted on the workpiece holding member along a circumferential direction to obtain a metal ring;
It is characterized by having.

  In the present invention, for example, even when the circumference of the drum varies due to thermal deformation or the like, a correction load having a size capable of making the entire drum into a substantially circular shape is applied to the drum. Can do. That is, the work holding member can be inserted in a state where each of the drums having various circumferential lengths is corrected into a substantially circular shape. Accordingly, it is possible to avoid the drum and the work holding member from interfering with each other, so that the work for inserting the work into the drum can be smoothly performed. Furthermore, since deformation of the drum due to the interference can be avoided, a highly accurate metal ring can be obtained efficiently.

  The workpiece holding member can be reduced in diameter and expanded, and before the correcting step, a step of setting a minimum clearance between the outer peripheral surface of the reduced workpiece holding member and the inner peripheral surface of the drum It is preferable to carry out.

  Further, before the correcting step, it is preferable to perform a step of obtaining a minimum diameter of an inscribed circle inscribed in the drum when the minimum clearance is obtained over the entire circumference of the drum.

  Furthermore, before the step of correcting, a step of obtaining a correction load capable of correcting the drum so that the drum has a substantially circular shape having an inscribed circle having a diameter equal to or larger than the minimum diameter. Preferably, the correcting load is applied to the drum in the correcting and correcting step.

  That is, first, with respect to the clearance between the outer peripheral surface of the reduced diameter workpiece holding member and the inner peripheral surface of the drum, when the workpiece holding member is inserted into the drum, the minimum clearance to be ensured over the entire circumference is set. Find the size (minimum clearance). Next, when the minimum clearance is obtained over the entire circumference of the drum, the minimum dimension (minimum diameter) of the diameter of the inscribed circle inscribed in the drum is obtained.

  Then, a correction load capable of correcting the drum is obtained so as to have a shape having an inscribed circle equal to or larger than the minimum diameter (substantially perfect circle shape), and the correction load is applied to the drum.

  As described above, even when the peripheral lengths of the drums are different, the workpiece holding member can be inserted in a state of being corrected to a substantially perfect circle shape. At this time, the minimum clearance is ensured, so that the drum is prevented from interfering with the work holding member. Therefore, the work holding member can be smoothly inserted into the drum.

  Moreover, the concern that the drum may be damaged can be eliminated. Although it is not possible to cut out a site where a scratch has occurred to obtain a product (metal ring), according to the present invention, since the generation of a scratch is avoided, the yield of the metal ring is improved.

  Furthermore, in the present invention, since the drum is corrected to a substantially perfect circle shape, a highly accurate metal ring can be obtained efficiently.

Further, the present invention provides a metal ring for obtaining a metal ring by cutting a metal drum whose shape is corrected on the outer peripheral surface of a work holding member capable of reducing and expanding the diameter along the circumferential direction. Manufacturing equipment,
A set of correction members having an arcuate inner wall, and load applying means for applying a correction load by bringing the inner wall into contact with the outer peripheral surface of the drum by relatively moving the set of correction members. Having a correction mechanism;
A moving mechanism for relatively moving the corrected drum and the reduced diameter work holding member and inserting the work holding member into the drum;
Control means for controlling the load applying means and the moving mechanism;
With
The control means can obtain a clearance equal to or larger than a preset minimum clearance between the diameter of an inscribed circle inscribed in the drum and the outer peripheral surface of the work holding member over the entire circumference of the drum. The load applying means is controlled so as to apply a load for correcting to a perfect circle shape to the drum.

  That is, in the present invention, the load applying means is controlled by the control means so that an appropriate correction load is applied to the drum. For this reason, it is possible to correct the drum to have a substantially circular shape and a size that does not interfere with the workpiece holding member, regardless of variations in diameter (peripheral length).

  Therefore, the work of inserting the work holding member into the drum proceeds smoothly. At this time, since the drum is prevented from interfering with the work holding member for the reason described above, the work holding member can be smoothly inserted into the drum and the drum can be prevented from being damaged. it can.

  According to the present invention, an appropriate correction load is applied to the drum. For this reason, the drum can be corrected so as to have a substantially perfect circular shape and have an inner diameter with a dimension that avoids interference with the work holding member. Accordingly, the workpiece holding member can be smoothly inserted into the drum, and the concern that the drum is damaged is eliminated. For this reason, a yield improves.

  In addition, since the drum is corrected to a substantially perfect circle shape, a highly accurate metal ring can be obtained efficiently.

It is a principal part schematic perspective view of the manufacturing apparatus of the metal ring which concerns on embodiment of this invention. It is a schematic front view of the correction member shown in FIG. It is a schematic front view which shows the state which has arrange | positioned the drum in which the deformation | transformation produced to the said correction member. It is a schematic front view which shows the state which penetrated the workpiece | work holding member to the said drum corrected. It is a graph which shows the relationship between the minimum diameter of the inscribed circle of the said drum, and the correction load. It is a principal part front view which shows the state which provided the correction load to the said drum through the said correction member.

  Hereinafter, a metal ring manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings by giving preferred embodiments in relation to a metal ring manufacturing apparatus for carrying out the method.

  FIG. 1 is a schematic perspective view of a main part of a metal ring manufacturing apparatus (hereinafter also referred to as “ring manufacturing apparatus”) 10 according to the present embodiment. The ring manufacturing apparatus 10 is for obtaining a metal ring (not shown) from a metal drum 12, and a correction mechanism 14 for correcting the drum 12 and a drum after correction on an outer peripheral surface 16 a of the work holding member 16. And a cutting mechanism 18 that cuts along the circumferential direction in a state where 12 is mounted.

  The correction mechanism 14 includes correction members 20 and 22 and an air chuck 24 (load applying unit) for opening and closing the correction members 20 and 22. In the correction member 20, a semi-cylindrical recess 26 is recessed and formed on the upper end surface. On the other hand, a semi-cylindrical recess 28 corresponding to the recess 26 is recessed and formed on the lower end surface of the correction member 22. The That is, the correction members 20 and 22 have inner walls (concave portions 26 and 28) having an arc shape.

  As will be described later, the concave portions 26 and 28 are portions for correcting the drum 12, and the length direction (arrow A direction in FIG. 1) of the concave portions 26 and 28 is substantially the same as the longitudinal direction size of the drum 12. Set to be equivalent. Of course, the concave portions 26 and 28 are formed with a curvature that enables the drum 12 to be corrected to a substantially circular shape. In addition, a groove 30 for imparting flexibility to the correction member 22 is provided above the recess 28 of the correction member 22.

  The air chuck 24 is supported by a support column (not shown), and is attached to a pair of piston rods 31 and 31 that expand and contract in synchronization with each other in the opposite directions by the action of air pressure, and to the tips of the piston rods 31 and 31, respectively. A pair of arms 32 and 32 are provided.

  The arms 32 and 32 are connected to the correction members 20 and 22, respectively, and follow the expansion and contraction of the piston rods 31 and 31, thereby displacing the correction members 20 and 22 in a direction approaching or separating from each other.

  Further, between the piston rod 31 and the arm 32, a load cell (not shown) capable of measuring the load applied to the correction members 20 and 22 by the air chuck 24 is disposed.

  The correction mechanism 14 configured in this manner is installed on a base (not shown), for example. The base is provided on a rail (not shown) provided along the axial direction of the workpiece holding member 16, and the workpiece holding member is guided by the rail under the action of a moving mechanism (not shown) such as a cylinder. It is displaced in a direction approaching or separating from 16.

  The cutting mechanism 18 including the workpiece holding member 16 is a known mechanism described in Japanese Patent Application Laid-Open No. 2011-167702. Therefore, in this specification, only the outline will be described, and details will be omitted.

  Inside the work holding member 16, a hollow cylindrical pressing member (not shown) is accommodated which is contracted or expanded under the action of a cam. The workpiece holding member 16 is reduced in diameter or increased in size as the pressing member is reduced in diameter or increased in diameter.

  The cutting mechanism 18 further includes a spindle inserted into the pressing member, a motor for rotationally biasing the spindle, and a processing head (none of which is not shown) for cutting the drum 12 at a predetermined position. Among these, the processing head is composed of laser light irradiation means and irradiates the drum 12 with laser light. The machining head may be provided with a cutting blade that cuts in contact with a predetermined position of the drum 12 instead of the laser beam irradiation means.

  In the above configuration, the air chuck 24, the moving mechanism, the motor, the load cell, and the machining head are electrically connected to a control circuit 34 (control means). That is, the air chuck 24, the moving mechanism, the motor, the load cell, and the machining head are energized and deenergized under the control action of the control circuit 34.

  The ring manufacturing apparatus 10 according to the present embodiment is basically configured as described above. Next, the function and effect thereof are related to the metal ring manufacturing method according to the present embodiment. explain. 2 to 4 and 6, only a part of the arms 32 and 32 in the configuration of the air chuck 24 is shown, and the other illustrations are omitted.

  First, the piston rods 31 and 31 of the air chuck 24 are extended to separate the arms 32 and 32 from each other, and the correction members 20 and 22 are separated from each other as shown in FIG. In this state, as shown in FIG. 3, the drum 12 obtained through welding, solution treatment, or the like is placed on the concave portion 26 of the correction member 20. At this time, the drum 12 does not form a perfect circle.

  Next, the drum 12 is corrected. Here, in the present embodiment, the control circuit 34 controls the pressing force of the air chuck 24 so that the correction load applied to the drum 12 is within a predetermined range. The correction load is a size that allows the drum 12 to be corrected so that the drum 12 has a substantially circular shape and the work holding member 16 having a reduced diameter is prevented from interfering with the drum 12. .

  This correction load is obtained in advance as follows.

  First, in order to avoid the work holding member 16 from interfering with the drum 12, as shown in FIG. 4, the work holding member 16 has a reduced diameter between the outer peripheral surface 16 a of the work holding member 16 and the inner peripheral surface 12 a of the drum 12. The minimum clearance L is obtained by a preliminary test. The minimum clearance L is the minimum separation distance between the outer peripheral surface 16 a of the work holding member 16 and the inner peripheral surface 12 a of the drum 12 that should be ensured over the entire periphery of the drum 12.

  The minimum clearance L may be set according to the outer diameter Rb of the work holding member 16 and the outer diameter of the drum 12. For example, when the outer diameter Rb of the workpiece holding member 16 after the diameter reduction is 118 mm and the drum 12 is corrected into a substantially perfect circle shape having an outer diameter of 121 mm, the appropriate minimum clearance L is 0.5 mm. . That is, in this case, the outer peripheral surface 16 a of the work holding member 16 and the inner peripheral surface 12 a of the drum 12 are separated by 0.5 mm or more over the entire circumference of the drum 12.

  Then, the minimum diameter Ra of the inscribed circle inscribed in the drum 12 when such a minimum clearance L is obtained is obtained. Simply, it may be a total obtained by adding the minimum clearance L to the outer diameter Rb of the workpiece holding member 16 after the diameter reduction, but taking into account the tolerance of the dimensions of the recesses 26 and 28 and the inevitable deviation of the center position of the arc. A slightly larger value is preferable. For example, in the above case, 120 mm is appropriate for the minimum diameter Ra of the inscribed circle.

  FIG. 5 shows a change in the diameter of the inscribed circle of the drum 12 when a correction load of 0 to 500 N is applied to the drum 12. The correction load is adjusted by controlling the pressing force of the air chuck 24.

  From FIG. 5, it can be seen that by applying a correction load of 400 N or less, the diameter of the inscribed circle becomes 120 mm. Therefore, in order to set the minimum diameter Ra to 120 mm, the correction load may be 400 N or less.

  Here, when the correction load is less than 100 N, it is not easy to bring the drum 12 into close contact with the concave portion 26 of the correction member 20, that is, to make the drum 12 into a perfect circle shape. Therefore, the minimum clearance L can be obtained between the drum 12 and the outer peripheral surface 16a of the work holding member 16 over the entire circumference by setting the correction load applied to the drum 12 within the range of 100N to 400N. It becomes possible to correct to a substantially circular shape.

  Based on the result of the preliminary test, the control circuit 34 controls the pressing force of the air chuck 24 so that a correction load of 100N to 400N is applied to the drum 12. That is, the piston rods 31, 31 of the air chuck 24 are measured by the load cell, in other words, the correction load is measured, and contracted by a stroke amount that can apply the correction load of 100N to 400N to the drum 12. As a result, as the arms 32 and 32 approach each other, the correction member 20 and the correction member 22 approach each other, and as shown in FIG. A correction load of 100 N to 400 N is applied to the drum 12. At this time, an inscribed circle having a diameter of Ra or more is formed on the drum 12.

  When the drum 12 is corrected to a perfect circle shape by the correction mechanism 14 described above, it is generally assumed that the positions of the correction members 20 and 22 during correction are constant. However, in this case, if the circumferential length of the drum 12 varies, a sufficient load is not applied when the circumferential length is large, and a vertically long oval shape is applied. When the circumferential length is small, a load exceeding an appropriate range is applied and the landscape is long. It becomes an oval shape. In either case, when the short diameter is smaller than the diameter of the workpiece holding member 16, the work of inserting the workpiece holding member 16 does not proceed smoothly.

  On the other hand, in this embodiment, a correction load within a predetermined range is applied. For this reason, when the circumference of the drum 12 varies, the positions of the correction members 20 and 22 change.

  Thus, the minimum clearance L is set, the correction load that ensures the minimum clearance L is obtained in advance, and the correction load is applied to the drum 12 during the actual correction operation. In addition, the inner peripheral surface 12a can be corrected so as to be sufficiently separated from the outer peripheral surface 16a of the work holding member 16.

  After the above correction is completed, the control circuit 34 energizes the moving mechanism. Along with this, the base and the correction mechanism 14 are displaced so as to approach the work holding member 16 while being guided by the rail, and eventually the work holding member 16 is inserted into the drum 12. Since the drum 12 is corrected so that the minimum clearance L is formed with respect to the workpiece holding member 16 as described above, the drum 12 is prevented from interfering with the workpiece holding member 16. Therefore, the insertion work proceeds smoothly. Moreover, the concern that the drum 12 is damaged is also eliminated.

  After the work holding member 16 is inserted into the drum 12, as described in detail in Japanese Patent Application Laid-Open No. 2011-167702, the diameter of the work holding member 16 is expanded under the action of the cam. As a result, the outer peripheral surface 16 a of the work holding member 16 comes into contact with the inner peripheral surface 12 a of the drum 12. That is, the drum 12 is mounted and held on the work holding member 16.

  Next, the control circuit 34 issues a command signal for re-biasing the air chuck 24. Upon receiving this signal, the air chuck 24 extends the piston rods 31, 31. As a result, the correction member 22 and the correction member 20 are displaced in a direction away from each other, and the drum 12 is detached from the correction members 20 and 22.

  The control circuit 34 further energizes the motor. As a result, the spindle is urged to rotate, and the work holding member 16 rotates. Of course, the drum 12 held by the workpiece holding member 16 also rotates following this.

  In this state, the processing head is energized and the rotating drum 12 is irradiated with laser light. In the drum 12, the part irradiated with the laser light is removed and finally the part is cut. As a result, the metal ring is cut out. As described above, when the machining head includes a cutting blade instead of the laser beam irradiation means, the drum 12 is cut and cut by the cutting blade, and as a result, the metal ring is cut out.

  Since the drum 12 is corrected into a substantially perfect circle shape by the correction members 20 and 22, the metal ring also has a substantially perfect circle shape. That is, according to the present embodiment, a highly accurate metal ring can be obtained.

  Note that the present invention is not particularly limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 10 ... Ring manufacturing apparatus 12 ... Drum 14 ... Correction mechanism 16 ... Work holding member 18 ... Cutting mechanism 20, 22 ... Correction member 24 ... Air chuck 26, 28 ... Recess 30 ... Groove 31 ... Piston rod 32 ... Arm 34 ... Control circuit

Claims (5)

A metal ring manufacturing method for obtaining a metal ring by cutting a metal drum having a corrected shape on the outer peripheral surface of a work holding member and then cutting the drum along the circumferential direction,
By bringing a pair of correction members close to each other, the drum is held between the recesses formed in each of the correction members, and a correction load is applied to the drum so that the drum approaches a perfect circle shape. Correcting, and
Inserting the workpiece holding member into the corrected through-hole of the drum;
Cutting the drum mounted on the workpiece holding member along a circumferential direction to obtain a metal ring;
A method for producing a metal ring, comprising: In the manufacturing method of the metal ring of Claim 1,
The workpiece holding member can be reduced in diameter and expanded, and before the correcting step, a minimum clearance between the outer peripheral surface of the reduced workpiece holding member and the inner peripheral surface of the drum is set. A method of manufacturing a metal ring, comprising a step. In the manufacturing method of the metal ring of Claim 2,
Before the correcting step, the method includes the step of determining a minimum diameter of an inscribed circle inscribed in the drum when the minimum clearance is obtained over the entire circumference of the drum. In the manufacturing method of the metal ring of Claim 3,
Before the correcting step, the method includes a step of obtaining a correction load capable of correcting the drum into a substantially circular shape having an inscribed circle having a diameter equal to or larger than the minimum diameter, and the correcting step includes: A method of manufacturing a metal ring, wherein a correction load is applied to the drum. A metal ring manufacturing apparatus that cuts a metal drum having a corrected shape on the outer peripheral surface of a work holding member capable of reducing and expanding the diameter along the circumferential direction to obtain a metal ring. ,
A set of correction members having an arcuate inner wall, and load applying means for applying a correction load by bringing the inner wall into contact with the outer peripheral surface of the drum by relatively moving the set of correction members. Having a correction mechanism;
A moving mechanism for relatively moving the corrected drum and the reduced diameter work holding member and inserting the work holding member into the drum;
Control means for controlling the load applying means and the moving mechanism;
With
The control means can obtain a clearance equal to or larger than a preset minimum clearance between the diameter of an inscribed circle inscribed in the drum and the outer peripheral surface of the work holding member over the entire circumference of the drum. An apparatus for manufacturing a metal ring, wherein the load applying means is controlled so as to apply a load for correcting to a perfect circle shape to the drum.

Images