JP5363513B2 - Wire bending method and apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a method and a device for bending a wire rod by which the generation of wrinkles on the inner peripheral surface of the bent part of the wire rod is prevented. <P>SOLUTION: In the method and the device for bending the wire rod by which the wire rod 121 is bent, by bringing the wire rod 121 into contact with the outer peripheral surface of a round punch 145c in the state where the wire rod is crossed with the center axis of a round punch 145c and pressing the wire rod 121 on the side of the round punch 145c so that the wire rod 121 is wound around the outer peripheral surface of the round punch 145c, the round punch 145c is supported to be rotatable to its center axis. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  In the present invention, the wire rod is brought into contact with the outer peripheral surface of the round punch in a state intersecting the central axis of the round punch, and the wire rod is pressed toward the round punch side so that the wire is wound around the outer peripheral surface of the round punch. The present invention relates to a wire bending method and apparatus for bending a wire.

  A conventional spiral spring manufacturing method and apparatus in which an inner hook is formed on the inner end side and an outer hook is formed on the outer end side will be described with reference to FIGS.

  In FIG. 11, an inner hook forming groove 5 is formed in the mandrel 3 around which the wire 1 is wound around the outer peripheral surface from the outer peripheral surface toward the inside. The mandrel 3 is provided with a lower blade 9 having a wire holding surface 7 for holding the wire 1 through a space. Reference numeral 11 denotes wire rod feeding means for feeding the wire rod 1 toward the mandrel 3 through the wire rod holding surface 7. A cutting means 15 is provided between the wire holding surface 7 and the mandrel 3, which includes a lower blade 9 and an upper blade 13, and cuts the wire 1 positioned between the wire holding surface 7 and the mandrel 3. . Between the cutting means 15 and the mandrel 3, there is provided an outer hook forming means 21 which is composed of a die 17 and a punch 19 and forms an outer hook on the wire 1.

And the control part which drives the mandrel 3, the wire rod delivery means 11, the cutting means 15, and the outer hook formation means 21 performs the following operations.
(1) As shown in FIG. 11, the inner hook forming groove 5 formed from the outer peripheral surface of the mandrel 3 toward the inside is positioned on the same plane as the wire holding surface 7 holding the wire 1 to be fed out. The mandrel 3 is positioned, the wire feeding means is driven, and the wire 1 is inserted into the inner hook forming groove 5 of the mandrel 3 (first step).
(2) As shown in FIG. 12, the mandrel 3 is rotated in one direction around the central axis to form the inner hook 25, and the wire 1 is wound around the outer periphery of the mandrel 3. When the winding around the mandrel 3 is completed, the mandrel 3 is rotated in the other direction around the central axis to prevent spring back (second step).
(3) As shown in FIG. 13, the cutting means 15 is driven to cut the wire 1 positioned in the space between the wire holding surface 7 and the mandrel 3 (third step).
(4) As shown in FIG. 14, the outer hook forming means 21 is driven to form the outer hook 23 on the wire located in the space between the wire holding surface 7 and the mandrel 3 (fourth step) ( For example, see Patent Document 1).

JP 2006-26737 A (FIGS. 2 to 5)

The above-described spiral spring manufacturing method and apparatus have the following problems.
As shown in FIG. 14, the outer hook 23 is formed in one step using the outer hook forming means 21. Therefore, the shape of the outer hook is not stable.

  Further, when wear of the punch 19 of the outer hook forming means 21 progresses, there is a problem that wrinkles occur on the inner surface side of the formed outer hook 23.

  The present invention has been made in view of the above-mentioned problems, particularly in the latter bending process, and an object of the present invention is to realize a wire bending method and apparatus that does not cause wrinkles on the inner peripheral surface of the bending part of the wire. It is what.

In the invention according to claim 1 for solving the above-mentioned problem, the wire rod is brought into contact with the outer circumferential surface of the round punch so as to intersect the central axis of the round punch, and the wire rod is wound around the outer circumferential surface of the round punch. In the method of forming a wire by bending the wire by pressing the wire to the round punch side, the round punch is supported so as to be rotatable with respect to its central axis, and passes through the central axis of the round punch, In addition, one side of the wire is bent at a plane along the pressing direction of the wire, and the invention according to claim 2 passes through the central axis of the round punch. And, with the plane along the pressing direction of the wire rod as a boundary, the other side of the wire rod is bent and formed, and then one side of the wire rod is bent and formed.

According to a fourth aspect of the present invention, there is provided a wire bending apparatus, wherein the round punch is oriented in a direction in which the central axis of the round punch intersects the wire, and the round punch is rotatably supported. Of the punch part, the forming die part facing the forming round punch part through the insertion space of the wire, and the wire shaft in contact with the outer peripheral surface of the round punch from the forming die part side , the central axis of the round punch And one side of the wire rod is pressed against the round punch side by the forming die portion with a plane along the pressing direction of the wire rod as a boundary, and is wound around the outer peripheral surface of the round punch. in, which is characterized in that a control unit forming bending該線material, the invention according to claim 5, wherein the control unit passes through the central axis of the round punch, and, of the wire On which a plane along the pressure direction as a boundary to form bent the other side of the wire, the one side of the wire, is pressed against the round punch side by the forming die section, the outer peripheral surface of the round punch It is characterized in that the wire is bent by being wound around.

According to the first to sixth aspects of the invention, when the wire is bent, the wire is bent while moving in the bending direction by the component force in the longitudinal (bending) direction of the load applied to the wire. That is, bending is performed while extending the inner surface side of the bent portion of the wire, so that no wrinkle is generated in the bent portion of the wire.

It is a block diagram explaining the state of the 1st process of the manufacturing apparatus of the spiral spring which employ | adopted the bending method of this invention. It is a block diagram explaining the state of the 2nd process of the manufacturing apparatus of the spiral spring of FIG. It is a block diagram explaining the state of the 3rd process of the manufacturing apparatus of the spiral spring of FIG. It is a block diagram explaining the state of the 4th process of the manufacturing apparatus of the spiral spring of FIG. It is a block diagram explaining the state of the 5th process of the manufacturing apparatus of the spiral spring of FIG. It is a block diagram explaining the state of the 6th process of the manufacturing apparatus of the spiral spring of FIG. It is a figure explaining the spiral spring manufactured with the manufacturing apparatus of the spiral spring of FIG. It is a block diagram explaining the electrical connection of the manufacturing apparatus of the spiral spring of FIG. It is a flowchart explaining the action | operation of the control part of FIG. It is an A direction arrow directional view of the upper forming part of FIG. It is a block diagram explaining the state of the 1st process of the manufacturing apparatus of the conventional spiral spring. It is a block diagram explaining the state of the 2nd process of the manufacturing apparatus of the spiral spring of FIG. It is a block diagram explaining the state of the 3rd process of the manufacturing apparatus of the spiral spring of FIG. It is a block diagram explaining the state of the 4th process of the manufacturing apparatus of the spiral spring of FIG.

  Embodiments of the present invention will be described below. The spiral spring manufacturing apparatus incorporating the bending method and apparatus of the present invention can manufacture a spiral spring as shown in FIG. In FIG. 7, a spiral spring 101 formed by forming a wire in a spiral shape has an inner hook 103 formed at an inner end portion thereof and an outer hook 105 formed at an outer end portion thereof.

  Next, a spiral spring manufacturing apparatus according to this embodiment will be described with reference to FIG. The mandrel 111 is driven to rotate about a central axis (axis O perpendicular to the paper surface), and is further driven in the vertical direction. A wire rod 121 is wound around the outer peripheral surface of the mandrel 111, and an inner hook forming groove 113 is formed from the outer peripheral surface toward the inside.

  A lower jig 131 is disposed adjacent to the mandrel 111. The lower jig 131 has a wire holding surface 133 that holds the wire 121. Above the lower jig 131, an upper moving body 141 driven in the vertical direction is disposed.

  The upper moving body 141 includes a cutting upper blade portion 143 capable of contacting the wire holding surface 133 in the vicinity of the surface 135 of the lower jig 131 facing the mandrel 111, a surface of the lower jig 135 facing the mandrel 111, and a mandrel. An upper forming round punch portion (forming round punch portion) 145 that can be in contact with the wire rod 121 between them is provided.

  As shown in FIG. 10, the upper forming round punch part 145 is provided with brackets 145a and 145b along the winding direction of the wire 121 on both sides of the lower part. A round punch 145c is rotatably attached to the brackets 145a and 145b. That is, the round punch 145c is provided so as to be rotatable about an axis that is parallel to the wire holding surface 133 and orthogonal to the feeding direction of the wire 121.

  A lower moving body 151 driven in the vertical direction is disposed between the mandrel 111 and the surface 135 of the lower jig 131 facing the mandrel 111 and below the lower jig 131. The lower moving body 151 moves while sliding in contact with the surface 135 of the lower jig 131 facing the mandrel 111 and cooperates with the cutting upper blade portion 143 to cut the wire 121, and the upper moving blade 151 A lower forming die portion (forming die portion) 155 that forms the outer hook 105 on the wire 121 in cooperation with the round punch 145c of the forming round punch portion 145 is provided.

  Then, the upper forming round punch portion 145 of the upper moving body 141 presses the wire 121 located in the space between the wire holding surface 133 and the mandrel 111 from above, so that the space between the wire holding surface 133 and the mandrel 111 is increased. It is a pressing means for prohibiting the wire 121 located in the space from moving upward from the same plane as the wire holding surface 133.

  Further, a cutting means for cutting the wire 121 located in the space between the wire holding surface 133 and the mandrel 111 with the cutting upper blade 143 of the upper moving body 141 and the cutting lower blade 153 of the lower moving body 151. It has become.

  Further, the outer hook 105 is formed on the wire 121 located in the space between the wire holding surface 133 and the mandrel 111 by the upper forming round punch portion 145 of the upper moving body 141 and the lower forming die portion 155 of the lower moving body 151. The outer hook forming means. The portion constituting the outer hook forming means is a portion for performing the bending method of the present invention, and corresponds to an embodiment of the bending device of the present invention.

  In the above manufacturing apparatus, the upper moving body 141 is lowered and the lower moving body 151 is raised to cut the wire 121 and form the outer hook 105. However, the wire 121 is first cut. Next, the upper forming round punch portion 145, the cutting upper blade portion 143, the lower forming die portion 155, and the cutting lower blade portion 153 of the lower moving body 151 are formed so that the outer hook 105 is formed. ing.

  The wire 121 is fed toward the mandrel 111 via the wire holding surface 133 by a pair of feed rollers 161 as wire rod feeding means. Then, as shown in FIG. 8, the upper moving body 141 and the lower moving body 151 constituting the mandrel 111, the feeding roller 161 that is the wire feeding means, the pressing means, the cutting means, and the outer hook forming means are controlled by the control unit 201. Control driven.

Next, the operation of the control unit 201 will be described with reference to FIGS. 9 and 1 to 6.
(1) As shown in FIG. 1, the inner hook forming groove 113 formed from the outer peripheral surface of the mandrel 111 toward the inside is positioned on the same plane as the wire holding surface 133 holding the wire 121 to be fed out. The mandrel 111 is positioned, and the feed roller 161 which is a wire feed unit is driven to insert the wire 121 into the inner hook forming groove 113 of the mandrel 111 (first step).
(2) As shown in FIG. 2, the mandrel 111 is rotated approximately 90 ° in one direction around the central axis O, and the wire 121 located in the space between the wire holding surface 133 and the mandrel 111 is held by the wire. The mandrel 111 is lowered so as to be positioned on the same plane as the surface 133 to form the inner hook 103 (second step).
(3) As shown in FIG. 3, the mandrel 111 is rotated in one direction about the central axis O while the wire 121 is fed by driving the feed roller 161 as the wire feeding means, and the wire is placed on the outer periphery of the mandrel 111. While winding 121, the mandrel 111 is lowered so that the wire 121 located in the space between the wire holding surface 133 and the mandrel 111 is located on the same plane as the wire holding surface 133.

  Then, when the winding of the wire 121 around the mandrel 111 is finished, the upper moving body 141 having the upper forming round punch portion 145 that is the pressing means is lowered, and the wire forming surface 133 and the mandrel 111 are separated by the upper forming round punch portion 145. The wire 121 located in the space between is pressed from above, and the wire 121 located in the space between the wire holding surface 133 and the mandrel 111 is prohibited from moving upward from the same plane as the wire holding surface 133 (third) Process).

In addition, by lowering the upper moving body 141, the cut upper blade portion 143 of the upper moving body 141 also comes into contact with the wire 121 on the wire holding surface 133 of the lower jig 131.
(4) As shown in FIG. 4, the mandrel 111 is raised, the wire 121 located in the space between the wire holding surface 133 and the mandrel 111 is subjected to bending deformation with the forming round punch 145 as a fulcrum, and the outer hook The preliminary bending is performed (fourth step).
(5) As shown in FIG. 5, the mandrel 111 is rotated in the other direction around the central axis O to prevent spring back (fifth step).
(6) As shown in FIG. 6, the lower moving body 151 is raised. First, the wire 121 is cut so that the pre-bending portion is on the wire 121 side wound around the mandrel 111 with the cutting upper blade portion 143 and the cutting lower blade portion 153. Next, in a state where the wire 121 is movable in the bending direction, an outer hook 105 is formed on a portion where the wire 121 is pre-bently formed by the upper forming round punch portion 145 and the lower forming die portion 155, whereby a spiral spring is formed. 101 is manufactured (sixth step).

Such a spiral spring manufacturing method and apparatus can provide the following effects.
(1) In the fourth step, the mandrel 111 is raised, and the outer hook is pre-bently formed on the wire 121 located in the space between the wire holding surface 133 and the mandrel 111, and then in the sixth step, By forming the outer hook 105 in the pre-bent portion, the shape of the outer hook 105 is stabilized.
(2) The round punch 145c of the upper forming round punch portion 145 is provided to be rotatable around an axis that is parallel to the wire holding surface 133 and orthogonal to the feeding direction of the wire 121. For this reason, when forming the outer hook 105 in the pre-bending portion of the wire 121 in the sixth step, the wire rod is caused by the component force in the longitudinal (bending) direction of the load applied to the wire 121 by the round punch 145c. 121 is bent while moving in the bending direction. That is, the bending process is performed while extending the inner surface side of the outer hook 105. Thereby, wrinkles do not occur on the inner surface side of the outer hook 105.
(3) When the winding of the wire 121 to the mandrel 111 is completed in the third step, the upper moving body 141 having the upper forming round punch portion 145 that is a pressing means is lowered, and the upper forming round punch portion 145 holds the wire. The wire 121 located in the space between the surface 133 and the mandrel 111 is pressed from above, and the wire 121 located in the space between the wire holding surface 133 and the mandrel 111 moves upward from the same plane as the wire holding surface 133. In the fifth step, even if the mandrel 111 is rotated in the other direction around the central axis in the fifth step, the pre-bending portion of the outer hook formed in the fourth step is formed in the upper forming circle. Since it abuts on the punch portion 145 and does not move upward or in the wire direction, the position of the outer hook is determined when the outer hook 105 is formed in the sixth step. .
(4) The upper moving body 141 having the cutting upper blade portion 143 and the upper forming round punch portion 145, the cutting lower blade portion 153 that cuts the wire 121 in cooperation with the cutting upper blade portion 143, and the upper forming circle The upper forming punch, the lower forming die, and the cutting upper blade are configured by driving the lower moving body 151 having the lower forming die portion 155 that forms the outer hook 105 on the wire 121 in cooperation with the punch portion 145. Compared to the configuration in which the part and the cutting lower blade are driven, the configuration is simple.
(5) When rotating the mandrel 111 in the second step and the third step, the wire 121 located in the space between the wire holding surface 133 and the mandrel 111 is positioned on the same plane as the wire holding surface 133. Thus, by lowering the mandrel 111, the bending force does not act on the wire 121 located in the space between the wire holding surface 133 and the mandrel 111, and deformation can be prevented.

  In the spiral spring manufacturing apparatus, the upper moving body 141 is provided with a forming round punch portion, and the lower moving body 151 is provided with a forming die portion. However, the upper moving body 141 is provided with a forming die portion, and the lower moving body 151 is provided with a forming punch portion. May be provided.

  The present invention also relates to a method and an apparatus for bending a wire, and is applicable to a method other than the method and apparatus for manufacturing a spiral spring.

105 Outer hook 111 Mandrel 121 Wire material 133 Wire material holding surface 145 Upper forming round punch part (forming round punch part)
145c Round punch 155 Lower forming die part (forming die part)

Claims (6)

By bringing the wire into contact with the outer peripheral surface of the round punch in a state intersecting the central axis of the round punch, and pressing the wire toward the round punch so that the wire is wound around the outer peripheral surface of the round punch, In the method of bending a wire to bend the wire,
The round punch is supported rotatably about its central axis;
A method of bending a wire, wherein one side of the wire is bent at a plane passing through the central axis of the round punch and along the pressing direction of the wire. The other side of the wire is bent and formed on the other side of the wire with a plane passing through the central axis of the round punch and along the pressing direction of the wire, and one side of the wire is bent and formed. The method for forming a wire rod according to claim 1.   3. The wire bending method according to claim 1, wherein the wire is a wire forming a spring. A forming round punch portion for directing the round punch in a direction in which the central axis of the round punch intersects the wire and rotatably supporting the round punch;
A forming die part facing the forming round punch part through a wire insertion space;
Among the wires that are in contact with the outer peripheral surface of the round punch from the forming die portion side, one of the wires passes through the central axis of the round punch and along a plane along the pressing direction of the wire . A wire bending apparatus comprising: a control section configured to bend the wire by pressing the side toward the round punch by the forming die portion and winding the wire around the outer peripheral surface of the round punch. The controller is
Through the center axis of the round punch, and, in a plane along the pressing direction of the wire on the border after having formed bent the other side of the wire, the one side of the wire, by the shaping die unit 5. The wire bending apparatus according to claim 4, wherein the wire is bent by being pressed toward the round punch and wound around an outer peripheral surface of the round punch.   6. The wire bending apparatus according to claim 4, wherein the wire is a wire forming a spring.

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