JP4974244B2 - Spring forming machine and spring forming method - Google Patents

Description

  The present invention relates to a spring forming machine and a spring forming method for manufacturing a coil spring in which an end-side spring end extending in parallel with a central axis of a coil portion is bent and raised from the end of the coil portion.

As a conventional spring forming machine of this type, after forming a coil portion from a linear wire fed from a wire feeding device, the coil portion is gripped by a first gripping means to constitute the entire coil spring. The coil spring material to be cut is separated from the subsequent wire, and then the separated coil spring material is transferred to the raising forming position while being held by the first holding means, and then the coil spring material is held by the second holding means at the raising forming position. It is known to form a bent raised portion between a coil portion and a terminal-side spring end portion at a raising forming position after reworking.
Japanese Patent Application Laid-Open No. 11-244974 ([Claim 1], [0035] to [0038], FIGS. 8 and 22)

  However, in the above-described conventional spring forming machine, before forming the bent raised portion between the coil portion and the terminal spring end, the coil spring material is separated from the wire, and the coil spring material is raised and transferred to the forming position. Then, the bending raising portion of the end side spring end is formed. Therefore, vibration and impact during transfer, and further, the coil portion rotates in the circumferential direction when re-gripping (passing) from the first gripping means to the second gripping means at the raising position, and the coil at the raising position The posture of the spring material varies in the circumferential direction of the coil part. As a result, there has been a problem that the relative position between the bent-up portion of the end spring end and the starting end of the coil portion varies in the circumferential direction of the coil portion.

  The present invention has been made in view of the above circumstances, and manufactures a coil spring with stable quality performance by suppressing variation in the relative position between the bent-up portion of the end side spring end and the start end of the coil portion. An object of the present invention is to provide a spring forming machine and a spring forming method.

  In order to achieve the above object, a spring forming machine according to the invention of claim 1 forms a coil portion from a linear wire, and then bends the end of the coil portion so as to be parallel to the central axis of the coil portion. A spring molding machine for forming a coil spring having a coil part and a terminal side spring end part by forming a terminal end spring end that extends and collides with a linear wire fed from a wire feeding device A forming tool for forming the coil portion from the wire, a coil holding tool for holding the coil portion formed by the forming tool, a mandrel for positioning the terminal end of the coil portion, and a forming tool, A tool fixing table in which the coil unit holding tool and the mandrel are fixed, and the tool fixing table can be rotated and linearly moved to be controlled at an arbitrary position, and the coil unit is held by the coil holding tool, and The coil part Having said tool fixed table around the mandrel while positioning the end in mandrel at which a rotatable tool driving mechanism.

  Here, “the end of the coil portion” in the present invention does not include “the straight end portion extending in the tangential direction of the curved portion of the wire constituting the coil portion” and “the narrow end of the coil portion” and “the coil portion” And “a linear end portion extending in the tangential direction of the curved portion of the wire portion constituting the“ coil portion ”in a broad sense.

  According to a second aspect of the present invention, in the spring forming machine according to the first aspect, the coil part holding tool includes a pair of sandwiching walls facing each other with the coil part sandwiched in the radial direction, and an opposing direction of the pair of sandwiching walls. And a coil side surface support wall addressed to the coil portion in a direction perpendicular to the coil portion.

  According to a third aspect of the present invention, in the spring molding machine according to the second aspect, the coil side surface support wall is formed with an arc surface corresponding to the side surface of the coil portion, and the arc surface is adjacent to the coil portion. It is characterized in that an uneven engaging portion that engages with the uneven formed on the outer surface of the coil portion is formed by the wire.

  According to a fourth aspect of the present invention, in the spring molding machine according to the third aspect, the tool driving mechanism is provided with a rotating shaft for rotationally driving the tool fixing table, and a forming tool is provided at one end of the rotating shaft. A tool fixing table to which the coil part holding tool and the mandrel are fixed is provided, and a tool fixing subtable to which the coil part holding tool and the mandrel are fixed is provided at the other end, and is fixed to the tool fixing table. The concave / convex engaging portion formed on one of the coil holding tool and the coil holding tool fixed to the tool fixing sub-table is engaged with the concave / convex on the outer surface of the right-handed coil portion. The concavo-convex engaging portion formed on the other side is characterized in that it is configured to engage with the concavo-convex on the outer surface of the left-handed coil portion.

  According to a fifth aspect of the present invention, in the spring molding machine according to any one of the second to fourth aspects, the coil portion projects outward from the end surfaces of the pair of sandwiching walls on the side opposite to the coil side surface support wall. A pressing plate that abuts a portion of the coil portion that protrudes outward from the end surfaces of the pair of holding walls and allows the tool fixing table to rotate, and a pressing plate that reciprocates with respect to the coil holding tool. It is characterized in that an auxiliary drive mechanism for moving is provided.

  The invention of claim 6 is characterized in that, in the spring forming machine according to claim 1, the coil part holding tool includes a coil part insertion shaft that can be inserted inside the coil part.

  According to a seventh aspect of the present invention, in the spring forming machine according to the sixth aspect, the outer surface of the coil portion insertion shaft is engaged with the concavities and convexities formed on the inner surface of the coil portion by adjacent wires constituting the coil portion. It has the feature in which the uneven | corrugated engaging part which forms is formed.

  In the spring forming method according to the invention of claim 8, after forming the coil portion from a linear wire, the end of the coil portion is bent and the end-side spring end extending parallel to the central axis of the coil portion is formed. A spring forming method for manufacturing a coil spring having a coil portion and a terminal end spring end, a forming tool for forming a wire, a coil portion holding tool for holding a coil portion, and a coil portion And a mandrel for positioning the end of the tool is fixed to the tool fixing table, and a tool driving mechanism capable of controlling the positioning to an arbitrary position by rotating and moving the tool fixing table is provided. After forming the coil part with the forming tool, hold the coil part with the coil holding tool and position the end of the coil part with the mandrel. The pivots have characterized a bent portion between the coil portion and the terminal-side spring end at the molding.

[Invention of Claims 1, 2, 6, 8]
According to the invention according to claims 1 and 8 configured as described above, after forming a wire rod into a coil portion with a forming tool, the wire rod is not cut and continuously between the coil portion and the terminal spring end portion. Mold the bent part.

  Here, the forming tool is fixed to a tool fixing table, and a mandrel and a coil portion holding tool are fixed to the tool fixing table in addition to the forming tool. The tool fixing table is rotated and linearly moved by the tool drive mechanism and can be positioned and controlled at any position, and the mandrel and coil holding tool fixed to the tool fixing table can be positioned at any position. By controlling, the bend raising part between the coil part and the terminal side spring end part is formed as follows.

  That is, after forming the coil part with the forming tool, the tool fixing table together with the coil part around the core metal in the state where the coil part is held by the coil part holding tool and the end of the coil part is positioned with the core metal Rotate. Then, the space between the coil portion and the subsequent wire at the end thereof is bent along the mandrel (following), and a bent portion between the coil portion and the end side spring end is formed.

  As described above, according to the spring forming machine and the spring forming method of the present invention, before the wire constituting the entire coil spring is separated from the subsequent wire, the bending raising portion between the coil portion and the terminal spring end portion is provided. Therefore, it is possible to suppress or eliminate the relative positional variation between the bent-up portion of the end-side spring end and the start end of the coil portion as compared with the prior art, and manufacture a coil spring with stable quality performance. It becomes possible.

  Here, the coil part holding tool includes a pair of sandwiching walls facing each other with the coil part sandwiched in the radial direction, and a coil side support wall that is directed to the coil part in a direction perpendicular to the opposing direction of the pair of sandwiching walls. It is good also as a structure which hold | maintains a coil part from the outside (invention of Claim 2), and is equipped with the coil part insertion shaft which can be inserted in the inside of a coil part, and is a structure which supports a coil part from the inside ( Invention of Claim 6).

[Inventions of Claims 3 and 4]
According to the invention of claim 3, since the concave and convex engaging portion formed on the arc surface of the coil side support wall engages with the concave and convex formed on the outer surface of the coil portion by the adjacent wire of the coil portion. The coil part held by the coil part holding tool is prohibited from moving in the central axis direction.

  Here, the unevenness formed on the outer surface of the coil portion by the adjacent wires of the coil portion differs in shape when the coil portion is left-handed and when the coil portion is right-handed. On the other hand, according to the invention of claim 4, a coil holding tool provided with a tool fixing table and a tool fixing sub-table, and having a concavo-convex engaging portion for a right-handed coil portion, and a left-handed coil Since the coil part holding tool provided with the concave / convex engaging part for the part is fixed, even if the winding direction of the coil part is either right-handed or left-handed, the concave / convex on the outer surface thereof is either It can be engaged with the concavo-convex engaging part of the coil part holding tool.

[Invention of claim 5]
According to the invention of claim 5, when the coil portion is held by the coil portion holding tool, the side surface of the coil portion protrudes outward from the end surfaces of the pair of holding walls, and the pressing plate abuts on the protruding portion. . When the tool fixing table is rotated in this state, relative rotation of the tool fixing table with respect to the pressing plate is allowed because the side surface of the coil portion is in sliding contact with the pressing plate. And since a coil part is pinched and hold | maintained between a coil part holding tool and a pressing board, the movement to the radial direction of a coil part is prohibited. Thereby, dropping of the coil part from the coil part holding tool can be prevented.

[Invention of Claim 7]
According to the seventh aspect of the present invention, the concavo-convex engaging portion formed on the outer surface of the coil portion insertion shaft engages with the concavo-convex formed on the inner surface of the coil portion by the adjacent wire material of the coil portion. The coil portion held by the portion holding tool is prohibited from moving in the central axis direction.

[First Embodiment]
Hereinafter, a first embodiment of a spring forming machine 100 according to the present invention will be described with reference to FIGS. As shown in FIG. 1, the spring forming machine 100 includes a wire rod feeding device 11 at the top of a base 10, and a tool driving mechanism 20 is attached to a front wall 10 </ b> A of the base 10.

  The wire rod feeding device 11 includes a box-shaped device housing 12 integrally provided on the upper portion of the base 10, and a wire rod feeding mechanism (not shown) for feeding the wire rod WR is accommodated inside the device housing 12. At the same time, auxiliary tool drive mechanisms 12A and 12B for directly moving the cutting tool 94 and the holding plate tool 95 are provided on the front surface of the apparatus housing 12.

  The wire rod feed mechanism includes at least a pair of wire rod feed rollers that sandwich and feed the wire rod WR, a servo motor that drives the wire rod feed roller, and a gear mechanism that transmits the power to the wire rod feed roller. A quill 13 that guides the wire rod WR fed by the wire rod feed roller through the front is attached to the front surface. The wire WR in the present embodiment has, for example, a circular cross section, and the quill 13 is formed with a wire insertion hole 13A having a circular cross section corresponding to the cross sectional shape of the wire WR (see FIG. 3). The wire WR is fed to the front molding space R1 through the wire insertion hole 13A. Further, the movement of the wire WR to the side is restricted by the quill 13, and the wire WR is fed only to the molding space R1. Here, the quill 13 is rotatable on the front surface of the apparatus housing 12 around the wire insertion hole 13A as a rotation axis.

  The auxiliary tool drive mechanisms 12A and 12B are provided above and below the quill 13 on the front surface of the apparatus housing 12, and the tools 94 and 95 are arranged in the vertical direction perpendicular to the feeding direction of the wire WR from the quill 13. Direct movement is possible. In the apparatus housing 12, a servo motor (not shown) for driving these auxiliary tool driving mechanisms 12A and 12B and a gear mechanism for transmitting the power to the auxiliary tool driving mechanisms 12A and 12B are provided. The servomotors of the wire rod feeding mechanism and the auxiliary tool driving mechanisms 12A and 12B are controlled by an NC control unit (not shown).

  That is, the auxiliary tool drive mechanism 12A that linearly moves the cutting tool 94 retracts the cutting tool 94 below the forming space R1 while the coil spring W1 is being formed from the wire WR, and the coil spring W1 is formed. After completion, the cutting tool 94 is raised to enter the forming space R1, and the coil spring W1 is separated from the subsequent wire WR.

  The holding plate tool 95 has a flat plate shape with the lower end portion being horizontal, and the auxiliary tool drive mechanism 12B advances and retracts the holding plate tool 95 from above the forming space R1 at a predetermined timing in the forming process of the coil spring W1. The pressing plate tool 95 corresponds to the “pressing plate” of the present invention, and the auxiliary tool driving mechanism 12B corresponds to the “auxiliary driving mechanism” of the present invention. The operation of the pressing plate tool 95 will be described later.

  The tool driving mechanism 20 includes a tool fixing table 68 on which a plurality of tools 90 to 93 are fixed, the Y axis direction perpendicular to the wire feeding direction in the vertical direction, and X perpendicular to the wire feeding direction in the horizontal direction. The shaft is linearly moved in the Z-axis direction parallel to the wire feeding direction and parallel to the wire feeding direction, and the first rotation axis J1 parallel to and parallel to the wire feeding direction and perpendicular to the first rotation axis J1. The tool 90 is configured to rotate around the two rotation axes J2, and the tools 90 to 93 can be positioned at arbitrary positions together with the tool fixing table 68.

  Hereinafter, the tool driving mechanism 20 will be described in detail. A Y-axis moving base 21 is attached to the front wall 10 </ b> A of the base 10. The Y-axis moving base 21 has an L-shaped cross-section integrally including a side plate 21A parallel to the front wall 10A and a horizontal top plate 21B orthogonal to the upper side of the side plate 21A. The side plate 21A and the front wall 10A Is provided with a Y-axis linear motion mechanism 30 for linearly moving the Y-axis moving base 21 in the Y-axis direction. More specifically, a Y-axis mount 31 is attached to the front wall 10A of the base 10, and a ball screw shaft 34A is provided at the front of the Y-axis mount 31 at the center in the left-right direction in FIG. It is attached with its axis line oriented vertically. A pair of bearing stands 32 and 33 are provided on the front surface of the Y-axis mount 31 so as to be separated from each other in the vertical direction, and both ends of the ball screw shaft 34A can be rotated by the rolling ball bearings of the bearing stands 32 and 33. It is supported by.

  An output shaft of a Y-axis servo motor 35 fixed to the front surface of the Y-axis mount 31 is connected to a lower end portion of the ball screw shaft 34A through a joint 36. A ball screw nut 34B is screwed into a portion of the ball screw shaft 34A sandwiched between the bearing bases 32 and 33, and the ball screw nut 34B can be moved straight up and down by driving the Y-axis servo motor 35. ing.

  As shown in FIG. 2, linear guide rails 37 </ b> A and 37 </ b> A are attached in parallel to the ball screw shaft 34 </ b> A at the left and right positions of the ball screw shaft 34 </ b> A on the front surface of the Y-axis mount 31. Two sliders 37B and 37B are movably engaged with each of the linear guide rails 37A and 37A (see FIG. 1). The ball screw nut 34B and the two sliders 37B and 37B engaged with the linear guide rails 37A and 37A are fixed to the side plate 21A of the Y-axis moving table 21, and the Y-axis moving table 21 is fixed to the Y-axis moving table 21. The servomotor 35 linearly moves in the Y-axis direction perpendicular to the wire feeding direction (left direction in FIG. 1) in the vertical direction. The Y-axis moving base 21 is reinforced by triangular walls 21R and 21R passed between the side plate 21A and the top plate 21B.

  An X-axis moving table 22 is attached to the top surface of the top plate 21B of the Y-axis moving table 21, and the X-axis moving table 22 is placed directly in the X-axis direction between the top plate 21B and the X-axis moving table 22. An X-axis linear movement mechanism 40 is provided for movement. More specifically, at the upper surface of the top plate 21B of the Y-axis moving base 21, the ball screw shaft 44A has its axis line oriented in the horizontal direction orthogonal to the wire feed direction at the center in the left-right direction in FIG. It is attached in a state. As shown in FIG. 2, a pair of bearing bases 42 and 43 are provided on the upper surface of the top plate 21B so as to be separated in a horizontal direction orthogonal to the wire feeding direction, and the rolling balls of these bearing bases 42 and 43 are provided. Both ends of the ball screw shaft 44A are rotatably supported by the bearing.

  An output shaft of an X-axis servomotor 45 fixed to the top plate 21B is connected to one end portion (left end portion in FIG. 2) of the ball screw shaft 44A through a joint 46. A ball screw nut 44B is screwed into a portion of the ball screw shaft 44A sandwiched between the bearing bases 42 and 43, and the ball screw nut 44B is orthogonal to the wire feeding direction by driving the X-axis servo motor 45. It is possible to move linearly in the horizontal direction (left and right direction shown in FIG. 2).

  As shown in FIG. 1, a pair of sills 21C and 21C extend in parallel with the ball screw shaft 44A at both side positions on the top plate 21B with the ball screw shaft 44A interposed therebetween. Each of these thresholds 21C and 21C protrudes from the upper surface of the top plate 21B, and linear guide rails 47A and 47A are fixed to the upper surfaces of the thresholds 21C and 21C. Two sliders 47B and 47B are movably engaged with the linear guide rails 47A and 47A, respectively (see FIG. 2). A ball screw nut 44B and two sliders 47B and 47B are fixed to the lower surface of the X-axis moving table 22, and the X-axis moving table 22 is orthogonal to the wire feeding direction by the X-axis servo motor 45. Is moved in the X-axis direction.

  A main body 60 having a tool fixing table 68 is attached to the upper surface of the X-axis moving table 22, and the main body 60 is placed directly in the Z-axis direction between the X-axis moving table 22 and the main body 60. A Z-axis linear motion mechanism 50 is provided for movement. More specifically, the ball screw shaft 54A is attached to the upper surface of the X-axis moving table 22 at the center in the left-right direction in FIG. 2 in a state where its axis is oriented in a horizontal direction parallel to the wire feeding direction. ing. As shown in FIG. 1, bearing tables 52 and 53 are provided on the upper surface of the X-axis moving table 22 so as to be separated in a horizontal direction parallel to the wire feeding direction. Thus, both end portions of the ball screw shaft 54A are rotatably supported.

  An output shaft of a Z-axis servomotor 55 fixed to the X-axis moving base 22 is connected to a joint 56 at an end portion (left end portion in FIG. 1) opposite to the wire rod feeding device 11 of the ball screw shaft 54A. It is connected through. A ball screw nut 54B is screwed into a portion of the ball screw shaft 54A sandwiched between the bearing bases 52 and 53. When the Z-axis servo motor 55 is driven, the ball screw nut 54B is parallel to the wire feeding direction. In addition, it can move directly in the horizontal Z-axis direction.

  Straight travel guide rails 57A and 57A are provided in parallel to the ball screw shaft 54A at both side positions (on the left and right sides in FIG. 2) of the X-axis moving table 22 with the ball screw shaft 54A interposed therebetween. Two sliders 57B and 57B are movably engaged with the linear guide rails 57A and 57A, respectively. A ball screw nut 54B and two sliders 57B and 57B are fixed to the lower surface of the main body 60. The main body 60 can be moved linearly in the Z-axis direction by the Z-axis servomotor 55.

  That is, the main body 60 and the tool fixing table 68 are moved in the three axis (X, Y, Z axis) directions orthogonal to each other by the Y axis linear motion mechanism 30, the X axis linear motion mechanism 40, and the Z axis linear motion mechanism 50 described above. Direct movement is possible. The tool fixing table 68 can be rotated around a first rotation axis J1 and a second rotation axis J2 that are orthogonal to each other by a first rotation mechanism 71 and a second rotation mechanism 72 described below.

  The configuration of the first rotation mechanism 71 is as follows. That is, as shown in FIG. 3, a cylindrical shaft 61 extending parallel to the wire feeding direction is rotatably supported by the main body 60 by bearings 61B and 61B. A rotary head 63 is fixed to the end of the cylindrical shaft 61 on the quill 13 side, and a flat gear 61G is integrally fixed to the opposite end. A first rotary shaft servomotor 71M, which is a drive source of the first rotation mechanism 71, is attached to the rear surface of the main body 60 opposite to the quill 13, and an output rotary shaft of the first rotary shaft servomotor 71M. And the cylindrical shaft 61 are connected via a reduction gear 71D and flat gears 71G and 61G. Thus, the first rotation mechanism 71 is configured, and when the cylindrical shaft 61 is rotationally driven by the first rotation axis servomotor 71M, the rotation head 63 is parallel to the wire feed direction and is parallel to the first rotation axis J1 ( It rotates in conjunction with the cylindrical shaft 61).

  The configuration of the second rotation mechanism 72 is as follows. That is, as shown in FIG. 3, the inner shaft 62 is inserted inside the cylindrical shaft 61. The inner shaft 62 is supported so as to be rotatable relative to the cylindrical shaft 61 by bearings 62 </ b> B and 62 </ b> B fitted to both ends of the cylindrical shaft 61. In addition, a swivel support base 65 protrudes toward the quill 13 from an outer edge portion of the rotary head 63 that is offset outward from the first rotational axis J1 (shifted outward from the rotation center of the cylindrical shaft 61). A first relay shaft 64 that rotates about an axis orthogonal to the first rotation axis J1 is provided inside the rotary head 63, and an axis parallel to the first relay shaft 64 is provided inside the turning support base 65. A second relay shaft 66 and a driven shaft 67 that rotate around are provided.

  The inner shaft 62 and the first relay shaft 64 are connected by a pair of bevel gears 62G and 64G1, and the first relay shaft 64 and the second relay shaft 66 are located inside the turning support base 65. The second relay shaft 66 and the driven shaft 67 are connected by the flat gears 66G and 67G inside the turning support base 65.

  As shown in FIG. 3, on the rear surface side of the main body 60, a second rotary shaft servomotor 72 </ b> M that is a drive source of the second rotary mechanism 72 is attached above the first rotary shaft servomotor 71 </ b> M. The second rotary shaft servomotor 72M is mounted on the same axis as the inner shaft 62, and the output rotary shaft of the second rotary shaft servomotor 72M and one end of the inner shaft 62 are connected via a speed reducer 72D. . Thus, the second rotating mechanism 72 is configured, and when the second rotating shaft servomotor 72M rotates the inner shaft 62, the first and second relay shafts 64 and 66 rotate in conjunction with each other within the rotating head 63, and the first The second rotation axis J2 (driven shaft 67) orthogonal to the rotation axis J1 rotates about the rotation center.

  The driven shaft 67 passes through the turning support base 65 and protrudes toward the first rotation axis J1 (rotation center of the rotation head 63), and a tool fixing table 68 is fixed to the protruding end portion. That is, the tool fixing table 68 is rotated around the first rotation axis J1 together with the rotary head 63 and the turning support base 65, and around the second rotation axis J2 orthogonal to the first rotation axis J1 around the driven shaft 67. Is driven to rotate.

  As shown in FIG. 4A, the tool fixing table 68 has a circular planar shape, for example, and the protruding end portion of the driven shaft 67 is fixed at the center of the back surface thereof, and the first rotation axis J1 side (see FIG. 4A). All the tools 90 to 93 are fixed to the tool fixing surface 68P facing upward (in FIG. 3).

  The spring forming machine 100 is provided with an NC control unit (not shown) that performs NC control of the servo motors 35, 45, 55, 71M, and 72M. When this NC control unit executes the NC program, the coil spring W1 shown in FIG. 5 is manufactured. That is, the tool fixing table 68 is positioned at an arbitrary position by the Y-axis, X-axis, and Z-axis moving mechanisms 30, 40, and 50, and the first and second rotating mechanisms 71 and 72, and the wire rod is formed in the forming space R1. The tools 90 to 93 that come into contact with the WR are sequentially changed. Thereby, the linear wire WR fed to the forming space R1 is formed in order from the first hook portion Wf1 toward the second hook portion Wf2, and the coil spring W1 shown in FIG. 5 is formed. After forming the two hook portions Wf2, the coil spring W1 is separated from the subsequent wire WR by the cutting tool 94. Hereinafter, the coil spring W1 is continuously manufactured from the wire WR by repeatedly executing this NC program.

  Here, the coil spring W1 is formed by bending the first straight portion Ws1 and the second straight portion Ws2 from the start and end of the right-handed coil portion Wc formed by winding the wire WR, and the central axis of the coil portion Wc. Further, a first hook portion Wf1 and a second hook portion Wf2 are provided at the ends of the first straight portion Ws1 and the second straight portion Ws2, respectively. Here, the second straight line portion Ws2 and the second hook portion Wf2 that follows the second straight portion Ws2 correspond to the “end-side spring end portion” of the present invention.

  Of the tools 90 to 95 used for forming the coil spring W1, the tools 90 to 93 fixed to the tool fixing table 68 will be described with reference to FIG. The tool 90 is a tool for mainly forming curved portions such as the first and second hook portions Wf1 and Wf2 and the coil portion Wc of the coil spring W1. The tool 90 extends radially outward from the center portion of the tool fixing table 68, and the tip portion protrudes to the side of the tool fixing table 68. As shown in FIG. 4 (A), the tip of the tool 90 has a right triangle shape as viewed from the direction of the second rotation axis J2, and the slope corresponding to the hypotenuse of the right triangle has a wire WR and A wire sliding contact groove 90A for abutting and guiding is formed.

  The tool 91 is a tool for forming the first bending raising portion Wb1 by bending at a right angle mainly between the first straight portion Ws1 and the starting end of the coil portion Wc. The tool 91 extends from the center portion of the tool fixing table 68 in the direction opposite to the tool 90, and the tip portion protrudes to the side of the tool fixing table 68. A step surface 91A is provided near the tip of the tool 91, and the tip side of the step surface 91A is a hill portion 91B. Note that a wire holding groove 91 </ b> C extending in the longitudinal direction of the tool 91 is recessed in the hill portion 91 </ b> B.

  The tool 93 positions the end of the coil part Wc while the coil part Wc is held by the tool 92 described below, and rotates the coil part Wc together with the tool fixing table 68 on the second rotation axis J2. The tool 92 is a tool for forming the second bending raising portion Wb2 between the coil portion Wc and the second linear portion Ws2 in cooperation with the tool 92. The tool 93 has a cylindrical shape standing upright from the rotation center of the tool fixing table 68. That is, the tool 93 is erected on the same axis as the second rotation axis J2 (driven shaft 67).

  The tool 92 holds the coil portion Wc from the outer side in the radial direction, rotates it around the second rotation axis J2 together with the tool fixing table 68, and forms the second bending raising portion Wb2 in cooperation with the tool 93. Is a tool. The tool 92 is provided eccentrically on the tool 91 side from the rotation center of the tool fixing table 68. As shown in FIGS. 4B and 12, the tool 92 includes a pair of clamping walls 92 </ b> A and 92 </ b> A that stand up from the tool fixing surface 68 </ b> P of the tool fixing table 68 and extend parallel to the tool 91. Further, the tool 92 has a reference line in which an intermediate line L2 parallel to the clamping walls 92A and 92A passes through the center of rotation of the tool fixing table 68 and is parallel to the clamping walls 92A and 92A, just between the pair of clamping walls 92A and 92A. The line L1 is arranged so as to be shifted in parallel by a predetermined dimension Q1. Specifically, the rotation of the tool fixing table 68 when forming the second bending raising portion Wb2 by the dimension Q1 in which the intermediate line L2 is the sum of the radius of the tool 93 and the radius of the wire WR with respect to the reference line L1. It is arranged so as to be shifted in parallel to the rear side (downward in FIG. 4A, rightward in FIG. 12) in the direction (clockwise direction in FIG. 4A).

  Of the sandwiching walls 92A and 92A, the portion close to the tool fixing surface 68P is connected by a coil side support wall 92E. A circular arc surface 92C corresponding to the outer surface of the coil portion Wc is formed on the coil side surface support wall 92E, and both of the pair of sandwiching walls 92A and 92A separated by a distance slightly larger than the outer diameter of the coil portion Wc. A coil portion receiving groove 92B having a substantially U-shaped cross section is continuously formed between the opposing surfaces by the arc surface 92C. In the coil portion receiving groove 92B, the boundary portion between the opposing surfaces of the pair of sandwiching walls 92A and 92A and the arc surface 92C is an inclined surface, so that the coil portion Wc smoothly enters the arc surface 92C. ing.

  An uneven engagement portion 92D is formed on the arc surface 92C. The concave / convex engaging portion 92D is configured to engage with the concave / convex formed on the outer surface of the coil portion Wc by, for example, adjacent wires of the right-handed coil portion Wc. When the portion Wc is received, the coil portion Wc is prohibited from moving in the axial direction. Here, the depth of the coil portion receiving groove 92B is smaller than the diameter of the coil portion Wc. When the coil portion Wc is received in the coil portion receiving groove 92B, the outer surface of the coil portion Wc is clamped by a pair. It is comprised so that it may protrude outside from the front end surface of wall 92A, 92A (refer FIG.11 and FIG.12).

  Hereinafter, when these tools 90 to 93 are distinguished, they are referred to as “bending tool 90”, “bending tool 91”, “coil portion holding tool 92”, and “mandrel tool 93”. Further, the bending tool 90 and the bending tool 91 correspond to the “forming tool” of the present invention, and the mandrel tool 93 corresponds to the “mandrel” of the present invention.

  The above is the description regarding the configuration of the spring forming machine 100 of the present embodiment. Next, a method of forming the coil spring W1 by the spring forming machine 100 will be described with reference to FIGS.

  First, each of the tools 90 to 93 provided in each tool fixing table 68, the cutting tool 94, and the pressing plate tool 95 are arranged at a retracted position retracted from the forming space R1, and the wire rod feeding device 11 has a predetermined length. The wire WR is fed to the molding space R1.

  Next, the tool fixing table 68 is formed by the Z-axis linear motion mechanism 50 with the tool fixing surface 68P of the tool fixing table 68 facing the X-axis direction and the bending tool 90 facing the quill 13 (forming space R1) side. Advancing toward the space R1.

  Next, the tool fixing table 68 is rotated around the second rotation axis J2, and the inclined surface of the bending tool 90 is pressed against the wire WR protruding from the quill 13. Then, the wire WR protruding from the quill 13 is bent downward.

  Next, in a state where the wire WR is abutted against the slope of the bending tool 90, the wire WR is fed by a predetermined length. 6A, the wire WR is guided by the wire sliding contact groove 90A of the bending tool 90 and plastically deformed into an arc shape, and the first hook portion Wf1 in the coil spring W1 is formed.

  Next, the tool fixing table 68 is retracted in the Z-axis direction so that the tools 90 to 93 are in the retracted position, and in this state, the wire WR is fed by the length of the first linear portion Ws1. Thereby, the 1st linear part Ws1 is provided following the 1st hook part Wf1 (refer FIG.6 (B)).

  Next, the tool fixing table 68 is rotated 180 degrees about the second rotation axis J2, and the bending tool 91 is directed to the quill 13 side, as shown in the change from FIG. 7 (A) to FIG. 7 (B). The wire rod WR is fed from the wire rod feeder 11 by a set amount while pressing the bending tool 91 against the first straight portion Ws1 from the horizontal direction (X-axis direction) orthogonal to the wire rod feed direction. Then, the rear end of the first straight portion Ws1 is bent at a substantially right angle, the first bent raised portion Wb1 in the coil spring W1 is formed, and the first straight portion Ws1 is substantially perpendicular to the wire feeding direction. Become. In FIG. 7A, for convenience of explanation, only the coil portion holding tool 92 is shown by a two-dot chain line.

  Next, the tool fixing table 68 is retracted in the Z-axis direction to set the tools 90 to 93 to the retracted position, where the tool fixing table 68 is rotated 180 degrees about the second rotation axis J2, and the bending tool 90 is moved to the quill 13 side. Turn to. In this state, the tool fixing table 68 is advanced in the Z-axis direction, and the wire sliding contact groove 90A of the bending tool 90 is made to stand by at a position directly in front of the quill 13 (front in the wire feeding direction).

  Next, the wire rod WR is fed from the wire rod feeder 11, and the wire rod WR is brought into contact with the wire rod sliding contact groove 90 </ b> A of the bending tool 90. Then, as shown in the change from FIG. 8 (A) to FIG. 9 (B) and FIG. 9, the wire WR is wound clockwise with the winding axis perpendicular to the wire feeding direction (parallel to the X-axis direction). It is wound in a coil shape. As a result, a right-handed coil portion Wc having a central axis that is continuous with the first straight line portion Ws1 and parallel to the first straight line portion Ws1 is formed via the first bending raising portion Wb1.

  Next, the tool fixing table 68 is retracted in the Z-axis direction to set the tools 90 to 93 to the retracted position, where the tool fixing table 68 is rotated 90 degrees about the second rotation axis J2, and the rotary head 63 is rotated first. The tool fixing surface 68P is rotated upward by the axis J1, and the coil receiving groove 92B of the coil holding tool 92 is set in the X-axis direction, that is, parallel to the central axis of the coil Wc.

  Further, while the tool fixing table 68 is performing the posture changing operation described above, the wire rod feeding device 11 feeds the wire WR for a predetermined length to the forming space R1, and at the end of the coil portion Wc. A second linear portion Ws2 that is continuous and extends linearly is provided. At this time, the second straight portion Ws2 is perpendicular to the central axis of the coil portion Wc.

  Next, the tool fixing table 68 is advanced in the Z-axis direction, and the coil portion holding tool 92 is put on standby at a position directly below the coil portion Wc (see FIG. 10).

  Next, as shown in FIG. 11A, the tool fixing table 68 is raised in the Y-axis direction, the coil portion holding tool 92 is brought closer from below the coil portion Wc, and the coil portion Wc is placed in the coil portion receiving groove 92B. At the same time, the holding plate tool 95 is lowered from above the coil portion Wc, and the coil portion Wc is sandwiched and held between the coil portion holding tool 92 and the holding plate tool 95 (see FIG. 12). .

  At this time, the tip end of the mandrel tool 93 is inserted into a support hole 95A formed in the presser plate tool 95, and both ends in the axial direction of the mandrel tool 93 are both supported by the presser plate tool 95 and the tool fixing table 68. Is done.

  Further, when the coil portion Wc is received in the coil portion receiving groove 92B, the second straight portion Ws2 following the coil portion Wc is passed through the gap between the mandrel tool 93 and the coil portion holding tool 92, The terminal end of the coil part Wc is positioned by the mandrel tool 93.

  Next, as shown in the change from FIG. 11A to FIG. 11B, the tool fixing table 68 is rotated about 90 degrees about the second rotation axis J2, and the central axis of the coil portion Wc is fed to the wire rod. The coil portion Wc is rotated so as to be parallel to the direction, and the wire rod WR is fed from the wire rod feeder 11 by a set amount. Then, the mandrel tool 93 is pressed against the end of the coil part Wc, and the second straight line part Ws2 is bent and raised from the coil part Wc at a substantially right angle along (following) the mandrel tool 93. That is, the second bending raising portion Wb2 that is curved at a substantially right angle is formed between the coil portion Wc and the second straight portion Ws2, and the second straight portion Ws2 is parallel to the central axis of the coil portion Wc.

  Here, since the coil portion Wc is sandwiched and held between the coil portion holding tool 92 and the pressing plate tool 95 in the vertical direction, the coil portion Wc becomes a coil portion in the process of forming the second bending raising portion Wb2. It is prevented from falling off the holding tool 92. Further, since the unevenness formed on the outer surface of the coil part Wc by the adjacent wire rod of the coil part Wc is engaged with the unevenness engaging part 92D formed on the arc surface 92C of the coil part holding tool 92, In the process of forming the second bent portion Wb2, the coil portion Wc is prevented from moving in the central axis direction.

  When the formation of the second bending raising portion Wb2 is completed, as shown in FIG. 13, the tool fixing table 68 and the presser plate tool 95 are moved linearly apart to release the holding of the coil portion Wc.

  Next, the tool fixing table 68 is rotated about the first rotation axis J1 and the second rotation axis J2, so that the tool fixing surface 68P of the tool fixing table 68 faces the X axis direction and the bending tool 90 faces the quill 13 side. In this state, the tool fixing table 68 is advanced in the Z-axis direction (see FIG. 14A). Then, as shown in the change from FIG. 14A to FIG. 14B, the tool fixing table 68 is lowered in the Y-axis direction to bring the bending tool 90 into contact with the wire WR protruding from the quill 13. A set amount of wire rod WR is fed. Then, a curved portion between the second straight portion Ws2 and the second hook portion Wf2 is formed (see FIG. 14B).

  Then, the wire WR is fed by a predetermined length in a state where the bending portion between the second straight portion Ws2 and the second hook portion Wf2 is abutted and pushed and bent into the wire sliding contact groove 90A of the bending tool 90. Thus, as shown in the change from FIG. 14B to FIG. 15, the second hook portion Wf2 continuous to the second linear portion Ws2 is obtained by plastically deforming the wire WR subsequent to the second linear portion Ws2 in an arc shape. Is formed. Thus, the entire coil spring W1 is formed.

  Finally, the tool fixing table 68 is retracted to retract the tools 90 to 93 from the forming space R1, and in this state, the cutting tool 94 is entered into the forming space R1, and the coil spring W1 is separated from the subsequent wire WR. .

  One coil spring W1 is manufactured by the above series of operations, and the coil spring W1 is continuously manufactured by repeating this series of operations. In the above description, the operation of the quill 13 has not been described, but it does not interfere with coil springs in the middle of molding and movable parts such as the tools 90 to 95, the tool drive mechanism 20, and the auxiliary tool drive mechanisms 12A and 12B. Similarly, the quill 13 also rotates around the wire insertion hole 13A in the molding process.

  Thus, according to the spring forming machine 100 and the spring forming method of the present embodiment, after forming the first bent raised portion Wb and the coil portion Wc, the coil portion holding tool 92 holds the coil portion Wc and By rotating the tool fixing table 68 together with the coil part Wc around the mandrel tool 93 with the end of the coil part Wc positioned by the mandrel tool 93, the coil part Wc and the second linear part Ws2 are rotated. A second bent raised portion Wb2 is formed. That is, before separating the wire constituting the entire coil spring W1 from the subsequent wire WR, the first bent portion Wb1 between the coil portion Wc and the first straight portion Ws1, the coil portion Wc, and the second straight portion. The second bend raising part Wb2 between Ws2 is molded together. Therefore, it is possible to suppress or eliminate a variation in the relative position between the first bent raised portion Wb1 (starting end portion of the coil portion Wc) and the second bent raised portion Wb2 in the circumferential direction of the coil portion Wc as compared with the conventional case. It becomes possible to manufacture the coil spring W1 having the quality performance.

[Second Embodiment]
A second embodiment of the present invention is shown in FIGS. 16 to 18, and the arrangement of the tools 90, 91, 920, 930 fixed to the tool fixing table 68 and the structure of the coil portion holding tool 920 are as described above. Different from the first embodiment. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to the same configurations, and duplicate descriptions are omitted.

  Tool fixing grooves 68M are recessed in the tool fixing surface 68P at a position where the tool fixing table 68 is equally arranged in the circumferential direction, and the bending tool 90 and the folding tool 90 are folded in two of the tool fixing grooves 68M. A bending tool 91 is fitted and fixed.

  The coil portion holding tool 920 of the present embodiment includes a first base 921 fixed to the tool fixing surface 68P, and a second base 922 fixed to the first base 921 in an overlapping manner.

  A step is provided at an intermediate position in the longitudinal direction on the upper surface of the first base 921, and a high floor portion 921A and a low floor portion 921B are provided with the step as a boundary. A pair of parallel side walls 921C and 921C are formed upright on both side edges in the short direction of the first base 921 on the upper surface of the high floor portion 921A.

  The second base 922 has a rectangular parallelepiped shape. The second base 922 is screwed to the high floor portion 921A by a bolt 923 penetrating the second base 922 while being placed on the high floor portion 921A of the first base 921, and is paired with a pair of side walls 921C and 921C. Rotation around the bolt 923 is prohibited. The bolt insertion hole 922A of the second base 922 is a long hole extending in the longitudinal direction, and the fixing position of the second base 922 with respect to the first base 921 can be adjusted in the longitudinal direction.

  As shown in FIG. 16B, a wire rod sandwiching space 924 is formed between the upper surface of the low floor portion 921 </ b> B of the first base 921 and the lower surface of the second base 922. A tip end portion of the mandrel tool 930 that protrudes from the rotation center of the tool fixing table 68 and penetrates the low floor portion 921 </ b> B of the first base 921 protrudes from the wire pinching space 924. The mandrel tool 930 (corresponding to “the mandrel” of the present invention) has a cylindrical shape and is abutted against the lower surface of the second base 922.

  Now, the second base 922 is integrally provided with a coil portion insertion shaft 925 according to the present invention. The coil portion insertion shaft 925 protrudes from the side surface of the second base 922 and extends in a direction perpendicular to the axis (second rotation axis J2) of the mandrel tool 930. Specifically, it extends in parallel and in the same direction as the bending tool 91. The coil portion insertion shaft 925 includes a pair of flat surface portions 925A and 925A whose side surfaces parallel to the axial direction are flush with the upper surface and the lower surface of the second base 922, and a pair of arc surface portions 925B and 925B. The tip is tapered in a tapered shape. Further, of the pair of arcuate surface portions 925B and 925B, one arcuate surface portion 925B (on the front side in the rotation direction of the tool fixing table 68 when forming the second bending raising portion Wb2 described later (in FIG. 16B) A concave / convex engaging portion 925C is formed on the arcuate surface portion 925B) disposed on the left side). The concave / convex engaging portion 925 </ b> C is configured to engage with the concave / convex formed on the inner surface of the coil portion Wc by, for example, an adjacent wire rod of the right-handed coil portion Wc. The surface opposite to the circular arc surface portion 925B on which the concave and convex engaging portion 925C is formed does not need to be an arc surface and may be a flat surface.

  Next, a method for forming the coil spring W1 by the spring forming machine 100 of the present embodiment will be described. In addition, since it is the same as that of the said 1st Embodiment about the shaping | molding method of parts other than the 2nd raising part Wb2 among coil spring W1, description is abbreviate | omitted.

  After the coil portion Wc is formed, the tool fixing table 68 is then retracted in the Z-axis direction to hold the tools 90, 91, 920, and 930 in the retracted positions, where the tool fixing table 68 is moved to the second rotation axis J2. And the rotary head 63 is rotated about the first rotation axis J1 so that the tool fixing surface 68P faces upward and the coil portion insertion shaft 925 of the coil portion holding tool 920 is parallel to the X-axis direction. Then, after the tool fixing table 68 is advanced in the Z-axis direction, it is moved in the X-axis direction as shown in FIG. 17B, and the coil portion insertion shaft 925 is moved from the terminal side of the coil portion Wc to the coil portion Wc. It inserts inside (state of FIG. 18 (A) and FIG. 18 (B)). At this time, the end of the coil part Wc is positioned by the mandrel tool 930.

  Next, as shown in the change from FIG. 17B to FIG. 17C, the tool fixing table 68 is rotated about 90 degrees around the second rotation axis J2, and the central axis of the coil portion Wc is adjusted. The coil portion Wc is rotationally moved so as to be parallel to the wire feeding direction. Then, as shown in a change from FIG. 18A to FIG. 18C, the mandrel tool 93 is pressed against the end of the coil portion Wc, and the second straight line is followed (followed) along the mandrel tool 93. The portion Ws2 is bent up at a substantially right angle from the coil portion Wc. That is, the second bend raising portion Wb2 between the coil portion Wc and the second straight portion Ws2 is formed, and the second straight portion Ws2 is bent and raised in parallel with the central axis of the coil portion Wc. When the tool fixing table 68 is rotated, an arcuate surface portion 925B provided on the front side of the coil portion insertion shaft 925 in the rotation direction of the tool fixing table 68 (clockwise direction when viewed from the tool fixing surface 68P side) is the coil portion Wc. Since the concave and convex engaging portion 925C is pressed against the inner side surface and engages with the concave and convex portions formed on the inner side surface of the coil portion Wc, the displacement of the coil portion Wc is prevented. As described above, this embodiment also has the same effect as the first embodiment.

[Third Embodiment]
A third embodiment of the present invention is shown in FIGS. 19 to 27, and includes a tool fixing sub-table 69 in addition to the tool fixing table 68, which are provided back-to-back on the front and back surfaces of the swivel support base 65. This is different from the first embodiment. Since other configurations are the same as those in the first embodiment, the same reference numerals are given to the same configurations, and duplicate descriptions are omitted.

  As shown in FIG. 19, the driven shaft 67 (corresponding to the “rotary shaft” of the present invention) provided in the main body 60 passes through the turning support base 65, and the first rotation axis J <b> 1 (the rotation center of the rotation head 63). The tool fixing subtable 69 is fixed to the protruding end portion so as to be integrally rotatable. In other words, the tool driving mechanism 20 moves the tool fixing sub-table 69 into the Y-axis direction perpendicular to the wire feeding direction in the vertical direction, the X-axis direction perpendicular to the wire feeding direction in the horizontal direction, and the wire feeding. Rotate around the first rotation axis J1 parallel to the wire feed direction and around the second rotation axis J2 orthogonal to the first rotation axis J1. The tool fixing subtable 69 and the tools 90 to 93 fixed thereto can be positioned at arbitrary positions.

  As shown in FIG. 20, the tool fixing sub-table 69 has, for example, a circular planar shape, the protruding end portion of the driven shaft 67 is fixed at the center of the back surface thereof, and is opposite to the first rotation axis J1 side. The same tools 90 to 93 as the tools 90 to 93 fixed to the tool fixing table 68 are fixed to the tool fixing surface 69P facing (downward in FIG. 19). Here, the bending tool 90, the bending tool 91, the coil portion holding tool 92, and the mandrel tool 93 fixed to the tool fixing sub-table 69 are symmetrical to the same tools 90 to 93 fixed to the tool fixing table 68. Has been placed. In other words, as shown in FIGS. 4A and 20B, the arrangement of the tools 90 to 93 on the tool fixing table 68 when viewed from the tool fixing surface 68P side (upper side in FIG. 19), The arrangement of the tools 90 to 93 in the tool fixing sub-table 69 when viewed from the tool fixing surface 69P side (lower side in FIG. 19) is a mirror image relationship just like the relationship between the right hand and the left hand.

  Further, the concave and convex engaging portion 92D of the coil portion holding tool 92 fixed to the tool fixing table 68 is configured so that the concave and convex portions on the outer surface of the right-handed coil portion are engaged with the concave and convex portions. The concave and convex engaging portion 92D of the coil portion holding tool 92 fixed to the table 69 is configured such that the concave and convex portions on the outer surface of the left-handed coil portion are engaged with the concave and convex portions. Therefore, when the coil portion of the coil spring W1 is right-handed, the coil portion is held by the coil-portion holding tool 92 of the tool fixing table 68. When the coil portion of the coil spring W1 is left-handed, the tool fixing sub The coil portion is held by the coil portion holding tool 92 of the table 69.

  Further, in the spring molding machine 100 of the present embodiment, not only the general coil spring W1 shown in FIG. 5 but also a double torsion type coil spring W2 shown in FIG. 21 can be molded. The coil spring W2 includes, in order from one end side, a first hook portion Wf1, a first straight portion Ws1, a first bend raising portion Wb1, a right-handed coil portion Wc1, a second bend raising portion Wb2, an intermediate straight portion Ws3, and a third bend. A raising portion Wb3, a left-handed coil portion Wc2, a fourth bending raising portion Wb4, a second straight portion Ws2, and a second hook portion Wf2 are provided. The right-handed coil portion Wc1 and the left-handed coil portion Wc2 are wound around the same central axis, and the first straight portion Ws1, the second straight portion Ws2, and the intermediate straight portion Ws3 are the center axes of the coil portions Wc1, Wc2. It extends in parallel. Here, the intermediate straight portion Ws3 corresponds to the “terminal end spring end” of the present invention with respect to the right-handed coil portion Wc1, and the second straight-line portion Ws2 and the second hook portion Wf2 subsequent thereto are the left-handed coil portion Wc2. This corresponds to the “terminal end spring end” of the present invention.

  Now, the coil spring W2 shown in FIG. 21 is shape | molded as follows. In other words, from the first hook portion Wf1 to the second bend raising portion Wb2, as described in the first embodiment, the tool fixing table 68 is rotated and linearly moved to be positioned at an arbitrary position, and the tool is fixed. Each tool 90 to 93 fixed to the table 68 and the pressing plate tool 95 are molded (see FIGS. 6 to 8 and FIGS. 22 to 24). During this time, the tools 90 to 93 fixed to the tool fixing sub-table 69 are not involved in molding.

  When the second bending raising portion Wb2 is formed, each tool fixed to the tool fixing sub-table 69 is controlled by rotating and linearly moving the tool fixing sub-table 69 instead of the tool fixing table 68 and controlling the positioning to an arbitrary position. 90 to 93 and the presser plate tool 95 are used to form the subsequent portion of the intermediate straight portion Ws3 of the coil spring W2, that is, the third bent portion Wb3 to the second hook portion Wf2. Specifically, after the third bending raising portion Wb3 is formed by the bending tool 91 of the tool fixing subtable 69 and the left-handed coil portion Wc2 is formed by the bending tool 90 of the tool fixing subtable 69, as shown in FIG. In addition, the left-handed coil portion Wc2 is sandwiched and held between the coil-portion holding tool 92 and the pressing plate tool 95 of the tool fixing subtable 69 from above and below, and the end of the left-handed coil portion Wc2 is positioned at the center of the tool fixing subtable 69. With the gold tool 93 positioned, in this state, as shown in FIG. 26, the tool fixing sub-table 69 is rotated about 90 degrees about the second rotation axis J2, and the fourth bending raising portion Wb4 is formed. Next, the holding of the left-handed coil portion Wc2 is released, the tool fixing subtable 69 is positioned, and the second hook portion Wf2 is formed by the bending tool 90 of the tool fixing subtable 69. As described above, in the coil spring W <b> 2, after the third bending raising portion Wb <b> 3, molding is performed by the molding tools 90 to 93 and the pressing plate tool 95 fixed to the tool fixing table 69, and the tool fixing table 68 is The fixed tools 90 to 93 are not involved in molding.

  Here, since the concavo-convex shape of the outer surface is different between the right-handed coil portion Wc1 and the left-handed coil portion Wc2, the coil-portion holding tool 92 that engages the concavo-convexities of the outer-side surface and the concavo-convex members is also the left-handed coil portion Wc1. A special one is required for the coil portion Wc2. On the other hand, of the coil spring W2, the third bending raising part Wb3, the left-handed coil part Wc2, and the second hook part Wf2 are curved fixed to the tool fixing table 68 by changing the program of the NC control part. The tool 90 and the bending tool 91 can also be molded. Therefore, portions of the coil spring W2 other than the fourth bending raising portion Wb4 are formed by the tools 90 to 93 of the tool fixing table 68 and the pressing plate tool 95, and the tool fixing sub-table 69 includes: As shown in FIG. 27, only the coil part holding tool 92 and the mandrel tool 93 corresponding to the left-handed coil part Wc2 may be fixed.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the first embodiment, the coil portion holding tool 92 is configured to hold the coil portion Wc from below, and the pressing plate tool 95 is configured to press the coil portion Wc from above. May hold the coil portion Wc from above, and the pressing plate tool 95 may be configured to hold the coil portion Wc from below. For this purpose, the arrangement of the pressing plate tool 95 and the cutting tool 94 on the front surface of the apparatus housing 12 may be reversed from that in the first embodiment.

  (2) In the above-described embodiment, the entire structure from the first hook portion Wf1 to the second hook portion Wf2 of the coil spring W1 is formed and then separated from the subsequent wire WR. In the coil spring W1, only the second hook portion Wf2 or the portions other than both hook portions Wf1, Wf2 are formed, and the second hook portion Wf2 or both hook portions Wf1, Wf2 are separated from the subsequent wire WR. Later, it may be molded separately.

  (3) In the first embodiment, the coil portion receiving groove 92B of the coil portion holding tool 92 has a U-shaped cross section. However, as shown in FIG. It may be.

  (4) In the first embodiment, the first bent raised portion Wb1 of the coil spring W1 is formed only by the bending tool 91. However, the mandrel tool and the mandrel tool are provided on the front surface of the apparatus housing 12. An auxiliary tool drive mechanism that reciprocates may be provided, and the first bending raising portion Wb1 may be formed by the bending tool 91 such that the end of the first straight portion Ws1 follows the mandrel tool.

  (5) In the first embodiment, the manufacturing example of the coil spring W1 having the first straight portion Ws1 and the second straight portion Ws2 parallel to the central axis of the coil portion Wc has been exemplified. It is also possible to manufacture a coil spring that is not provided by the spring forming machine of the above embodiment. In addition, the “terminal end of the coil portion” in the present invention does not include “the linear portion extending in the tangential direction of the curved portion of the wire constituting the coil portion” (for example, FIG. 13, 21) and “a broad end of the coil portion” including “a linear portion extending in the tangential direction of the curved portion of the wire constituting the coil portion” as shown in FIG. In the case of forming the bent raised portion at the “end in the broad sense of the coil portion”, the fixing position of the coil portion holding tool 92 on the tool fixing surfaces 68P and 69P shown in FIGS. 4 (A) and 20 (B) is Each may be shifted to the reference line L1 side. Then, the fixing position of the coil portion holding tool 92 can be changed in a direction orthogonal to the reference line L1 on the tool fixing surfaces 68P and 69P, and “in the tangential direction of the curved portion of the wire constituting the coil portion”. You may enable it to change the length of "the extended straight part".

  (6) The spring forming machine 100 and the spring forming method of the present invention are used for forming various coil springs such as a tension coil spring, a compression coil spring, a torsion coil spring, and a protective coil spring covering the outside of a cable or the like. be able to.

  (7) In the above-described embodiment, the cutting tool 94 is configured to advance and retract in the molding space R1 in the Y-axis direction. However, the cutting tool 94 may be configured to advance and retract in the molding space R1 from the X-axis direction.

The partial sectional side view of the spring molding machine which concerns on 1st Embodiment of this invention. B arrow view of the spring forming machine in FIG. AA sectional view in FIG. (A) Top view and (B) Perspective view of tool fixing table and each tool Coil spring side view (A) The perspective view which shows the shaping | molding operation | movement of a 1st hook part, (B) The perspective view of the state in which the 1st linear part was provided The perspective view which shows the shaping | molding operation | movement of a 1st bending raising part. The perspective view which shows the shaping | molding operation | movement of a coil part A perspective view of a state where molding of the coil portion is completed The perspective view which shows the state just before holding | maintaining a coil part. The perspective view which shows the shaping | molding operation | movement of a 2nd bending raising part. C arrow view in FIG. The perspective view of the state where the holding of the coil part was released The perspective view which shows the shaping | molding operation | movement of a 2nd hook part. A perspective view of a state in which molding of the second hook portion is completed (A) Perspective view of tool fixing table and tools according to second embodiment, (B) side view The perspective view which shows the shaping | molding operation | movement of a 2nd bending raising part. The figure which shows the shaping | molding operation | movement of a 2nd raising part Sectional drawing of the spring molding machine which concerns on 3rd Embodiment (A) perspective view and (B) plan view of the tool fixing sub-table and each tool Perspective view of coil spring A perspective view of a state where the right-handed coil portion is formed The perspective view of the state where the right-handed coil part is held by the coil part holding tool The perspective view of the state where the 2nd bending raising part was fabricated The perspective view of the state before a left-handed coil part is hold | maintained with a coil part holding tool The perspective view in the state where the 4th bend raising part was fabricated (A) perspective view, (B) plan view of a tool fixing sub-table and each tool according to a modified example The perspective view of the coil part holding tool which concerns on a modification (3) Perspective view of coil spring according to modification (5)

Explanation of symbols

11 Wire feeder 12B Auxiliary tool drive mechanism (auxiliary drive mechanism)
20 Tool drive mechanism 67 Driven shaft (Rotating shaft)
68 Tool fixing table 69 Tool fixing sub-table 90 Curving tool (molding tool)
91 Bending tool (forming tool)
92,920 Coil portion holding tool 92A, 92A Holding wall 92C Arc surface 92D Concavity and convexity engagement portion 92E Coil side surface support wall 93,930 Core metal tool (metal core)
95 Presser plate tool (presser plate)
100 Spring forming machine 925 Coil part insertion shaft 925C Uneven engaging part W1, W2 Coil spring WR Wire Wb1 First bending part Wb2 Second bending part Wb3 Third bending part Wb4 Fourth bending part Wc Coil part Wc1 Right Winding coil part Wc2 Left-handed coil part Ws1 First straight line part Ws2 Second straight line part Ws3 Intermediate straight line part

Claims (8)

After forming the coil portion from a linear wire, the terminal end of the coil portion is bent and raised to form a terminal end spring end extending parallel to the central axis of the coil portion, and the coil portion and the terminal end spring end are formed. A spring forming machine for manufacturing a coil spring having a portion,
A molding tool that abuts against a linear wire fed from a wire feeding device and molds the coil portion from the wire,
A coil part holding tool for holding the coil part molded by the molding tool;
A mandrel for positioning the terminal end of the coil part;
A tool fixing table to which the forming tool, the coil part holding tool, and the mandrel are fixed;
A state in which the tool fixing table can be rotated and linearly moved and controlled to be positioned at an arbitrary position, the coil portion is held by the coil holding tool, and the end of the coil portion is positioned by the mandrel. And a tool driving mechanism capable of rotating the tool fixing table around the mandrel.   The coil part holding tool includes a pair of sandwiching walls facing each other with the coil part sandwiched in the radial direction, and a coil side surface support that is directed to the coil part in a direction perpendicular to the opposing direction of the pair of sandwiching walls. The spring forming machine according to claim 1, further comprising a wall.   The coil side surface support wall is formed with an arc surface corresponding to the side surface of the coil part, and the arc surface has irregularities formed on the outer side surface of the coil part by adjacent wires constituting the coil part. The spring forming machine according to claim 2, wherein a concavo-convex engaging portion is formed to engage with the spring. The tool driving mechanism is provided with a rotating shaft for rotationally driving the tool fixing table, and the forming tool, the coil portion holding tool, and the mandrel are fixed to one end of the rotating shaft. The tool fixing table is provided, and a tool fixing subtable in which the coil part holding tool and the mandrel are fixed to the other end is provided,
The concavo-convex engaging portion formed on one of the coil part holding tool fixed to the tool fixing table and the coil part holding tool fixed to the tool fixing sub-table is the right-handed The concave / convex engaging portion formed on the other side is configured to engage with the concave / convex on the outer surface of the coil part, and is configured to engage with the concave / convex on the outer side of the left-handed coil part. The spring forming machine according to claim 3. The coil portion is configured to protrude outward from the end surfaces of the pair of sandwiching walls on the side opposite to the coil side surface support wall,
A pressing plate that abuts against a portion of the coil portion that protrudes outward from the end surface of the pair of clamping walls and allows the tool fixing table to rotate, and the pressing plate is brought into contact with and separated from the coil portion holding tool. The spring forming machine according to any one of claims 2 to 4, further comprising an auxiliary drive mechanism for reciprocally moving.   The spring forming machine according to claim 1, wherein the coil part holding tool includes a coil part insertion shaft that can be inserted inside the coil part.   The outer surface of the coil portion insertion shaft is formed with an uneven engagement portion that engages with the unevenness formed on the inner surface of the coil portion by adjacent wires constituting the coil portion. Item 7. The spring forming machine according to Item 6. After forming the coil portion from a linear wire, the terminal end of the coil portion is bent and raised to form a terminal end spring end extending parallel to the central axis of the coil portion, and the coil portion and the terminal end spring end are formed. A spring forming method for manufacturing a coil spring having a portion,
A tool for forming the wire, a coil part holding tool for holding the coil part, and a mandrel for positioning the terminal end of the coil part are fixed to a tool fixing table, and the tool A tool drive mechanism that can rotate and move the fixed table and control positioning at an arbitrary position is prepared.
After forming the wire into the coil part by the forming tool, the coil part is held by the coil holding tool and the end of the coil part is positioned by the core metal, with the core metal being the center. A spring forming method, wherein the tool fixing table is rotated together with the coil part to form a bent portion between the coil part and the terminal end spring end.

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