JP4913703B2 - Coil spring manufacturing machine and coil spring manufacturing method - Google Patents

Description

  The present invention relates to a coil spring manufacturing machine that forms a coil spring by abutting a wire fed forward from a wire guide with a forming tool, and more specifically, a wire that is abutted against a tool and bent in the forming direction of the coil spring. The present invention relates to a coil spring manufacturing machine that is pushed out by a pressing tool.

  As a conventional technique, for example, the coiling machine disclosed in Patent Document 1 includes a pair of rolls arranged opposite to each other as a wire feeding means, and a bending die is disposed on the front side of each roll in the wire feeding direction. In addition, a wire guide member (corresponding to the wire guide of the present application) is provided between the bending die and the feeding means. The bending die (corresponding to the forming tool of the present application) shifts the wire contact position on the wire contact surface in the coil spring forming direction with respect to the wire exit position on the guide member, and winds the wire in the direction opposite to the coil spring forming direction. It is installed. Further, a core for cutting the wire (corresponding to the core of the present application) is disposed between the guide member and the bending die at a position facing the bending die, and guides the surface of the bending die against the wire. A pitch tool that pushes the wire wound in the direction opposite to the coil spring forming direction to the outer side of the core bar located on the member side and in front of the wire feeding direction from the wire contact position (the press of the present application) (Corresponding to a tool) is provided so as to be retractable in the direction opposite to the forming direction with respect to the wire.

  In this coiling machine, the wire is inserted into the guide member, and then pressed against the bending die to be formed. At this time, the wire is coiled with respect to the position of the guide member at the wire contact surface of the bending die. Since the wire is wound in contact with the wire contact position at a position displaced in the forming direction, the wire is wound in the direction opposite to the coil spring forming direction. When the pitch tool is protruded to some extent in the coil spring forming direction and the wire is pushed in the forming direction, the wire having the initial tension in the direction opposite to the forming direction is wound at zero pitch, and the flat portion is formed. Furthermore, the winding direction of the wire can be freely set at an arbitrary position and not only in the forming direction but also in the reverse direction. As a result, only the stepwise pressing of the pitch tool to the wire is performed in one direction. Thus, a coil spring having a wound flat portion that is flat on both ends in the length direction can be manufactured at a lower cost by a simpler process than in the prior art.

  However, when this coiling machine forms the end winding part, when the remaining wire after the formed coil spring is cut is further fed to the wire and pressed against the bending die, the pitch tool Until it is pushed out, it is wound in the direction opposite to the coil spring forming direction. The flat part can be formed only after being pushed out by the pitch tool, and the part before being pushed out by the pitch tool remains a spiral bent part 101a in the direction opposite to the coil spring forming direction. It is up to. Therefore, when the flat portion 101b following the spiral bent portion 101a in the direction opposite to the forming direction is formed, for example, in the case of a compression spring, as shown in FIG. 20, in the end turn portion 101, the bent portion 101a and the continuation thereof. A crescent-shaped gap 101c is generated between the flat portions 101b.

  In recent years, there are many situations in which the spring accuracy is strictly required, but a coil spring having an accurate shape is required to cope with the severe accuracy. For this reason, for example, in a compression spring, a spiral bend in the direction opposite to the molding direction remains in the end winding portion of the wire, and the spring seat surface does not become flat due to a gap 101c formed in the end winding portion. As a result, the accuracy of the spring is improved. There was a problem such as not.

  Further, in the spring manufacturing apparatus disclosed in Patent Document 2, the coil portion is in contact with a wire (corresponding to the wire rod of the present application) wound spirally in the vicinity of the point tool (corresponding to the forming tool of the present application). A pitch tool (corresponding to the pressing tool of the present application) for setting the pitch is provided. This pitch tool can be moved parallel to the spring growth direction by a pitch tool drive motor and can be rotated at a predetermined angle around a rotation axis parallel to the spring growth direction (corresponding to the coil spring forming direction of the present application). A coil spring having a desired pitch is formed by controlling the pitch tool drive motor.

However, in the spring manufacturing apparatus disclosed in Patent Document 2, for example, in the formation of a compression spring, when the position of the point tool is set so as to form a wire in a spiral shape in the direction opposite to the coil spring forming direction, When forming, a spiral bend wound in the direction opposite to the coil spring forming direction remains, and a gap is formed between the flat portion and the spring seat surface, which does not become flat. As a result, there are problems such as inaccuracy of the spring.
JP-A-8-99142 (paragraphs 0020 to 0022, FIGS. 1 and 2) JP 2004-330209 A (paragraph 0025 and FIG. 1)

  The problem to be solved by the present application is a wire rod that has been sent so as to be spirally curved in a direction opposite to the coil spring forming direction in order to closely attach the end winding portion and stabilize the pitch width of the pitch winding portion. When the pitch tool (the pressing tool of the present application) pushes out the coil spring in the coil spring forming direction to form the flat part, the next flat part is formed by the spiral bending in the direction opposite to the coil spring forming direction left in the vicinity of the wire rod tip. A crescent-shaped gap is formed between the two and the conventional problems such as the spring seat surface not being flat in the end portion of the compression spring are solved. For example, no end portion is generated in the end portion of the compression spring. It is an object of the present invention to provide a coil spring manufacturing machine and a coil spring manufacturing method that make it possible to form such an accurate coil spring.

  The coil spring manufacturing machine according to claim 1 of the present invention forms a coil spring by abutting a wire rod fed from a wire rod guide to a molding region with a molding tool, and cooperates with the cutting tool and the mandrel to form the coil spring. A coil spring manufacturing machine that separates the wire from the wire rod, the wire rod feeding means for feeding the wire from the wire rod guide toward the forming region, and the wire rod fed from the wire rod guide closer to the coil spring forming direction than the wire rod outlet position of the wire rod guide. A molding tool that collides at the abutting point with the wire provided at the position and forms the wire along the periphery of the mandrel in a direction opposite to the coil spring molding direction, and the first servo motor in the coil spring molding direction. A pressing tool that is driven reciprocally and is driven to rotate around an axis parallel to the coil spring forming direction by a second servo motor is provided on the front surface of the base, and collides with the wire of the forming tool. The wire in the forward feeding of the wire along the pressing capable and wires from the most important feature in that a control unit for rotatably controlling the position pressing tool.

  The coil spring manufacturing machine according to claim 2 of the present invention is the coil spring manufacturing machine according to claim 1, wherein the pressing tool is provided so as to penetrate the base perpendicular to the feeding axis of the wire rod. It is attached to the front end of the pressing tool shaft supported in the through hole so as to be movable in the front-rear direction and to be rotatable around the through hole.

  The coil spring manufacturing machine according to claim 3 of the present invention is the coil spring manufacturing machine according to claim 2, wherein a first spur gear is coaxially attached to the pressing tool shaft, and the first spur gear and the axial direction are attached. A second servomotor having a second spur gear meshing with the output shaft attached to the output shaft is attached to the base, and the pressing tool shaft is driven to rotate by the second servomotor. .

  The coil spring manufacturing machine according to claim 4 of the present invention is the coil spring manufacturing machine according to claims 2 to 3, wherein the pressing tool shaft is restricted in relative movement in the axial direction from the pressing tool shaft. A connecting plate that rotatably supports the pressing tool shaft is provided, and the connecting plate is connected to a first servo motor that drives the connecting plate to reciprocate in the axial direction of the pressing tool shaft.

  The coil spring manufacturing machine according to claim 5 of the present invention is the coil spring manufacturing machine according to any of claims 2 to 4, wherein one end of the first spring motor is rotatably attached to the connecting plate. An eccentric plate is mounted so that the other end of the connected connecting rod can be rotated to an eccentric position. By rotating the first servo motor, the connecting plate is reciprocated in the axial direction together with the pressing tool shaft via the eccentric plate and the connecting rod. It is made to move.

  The coil spring manufacturing machine according to claim 6 of the present invention is the coil spring manufacturing machine according to any of claims 3 to 5, wherein the pressing tool shafts are provided in pairs at symmetrical positions with respect to the center line of the wire guide, The two servo motors and the first servo motor are characterized in that each pressing tool shaft can be driven to rotate or reciprocate simultaneously.

  The coil spring manufacturing method according to claim 7 of the present invention is a coil spring manufacturing method for forming a coil spring by abutting a wire rod fed from a wire rod guide to a molding region with a molding tool, wherein the coil spring is molded from the wire rod guide to the molding region. The wire rod fed toward the wire is collided with a forming tool provided with an abutting point with the wire rod at a position in front of the wire rod exit position of the wire rod guide and near the coil spring forming direction, and the wire rod is coiled around the mandrel. While forming in a curve in the direction opposite to the forming direction, the standby pressing tool advances in the vicinity of the forward direction of the wire feed of the forming tool, and the wire is formed in a curve in the direction opposite to the coil spring forming direction and sent out. The process of positioning the flat end winding part at a position where it can be formed by pressing the tip of the wire spring in the coil spring forming direction, and feeding the pressing tool while forming the wire flat while feeding the wire Rotating to the coil spring direction and moving forward to the coil spring forming direction to move the flat portion to the end winding position where the flat portion can be formed and forming the front flat end winding portion, and the pressing tool from the end winding position to the pitch winding position. After the wire rod has been moved forward, a predetermined amount of wire is fed out, a step of forming a pitch winding portion having a predetermined pitch and length, and a wire rod after the pressing tool has been retracted from the pitch winding position to the end winding position opposite to the coil spring forming direction. A step of forming a flat end winding portion on the rear side of the delivery, and a coil spring formed by cooperation of the cutting blade of the mandrel and the cutting tool of the cutting tool as the cutting tool reciprocates toward the mandrel And the step of moving the pressing tool in the direction opposite to the coil spring forming direction and rotating the pressing tool in the direction after the wire rod is fed out to return to the original position.

  In the coil spring manufacturing machine or the coil spring manufacturing method according to claims 1 and 7 of the present application, a coil spring is formed by abutting a wire rod fed from a wire rod guide to a molding region with a molding tool, and a cutting tool and the core After separating the coil spring from the wire in cooperation with gold, in order to form the next coil spring, the wire is further fed from the wire guide to the forming region, and the wire is brought into contact with the forming tool and formed into a curve. The leading portion of the wire that has been fed out from the forming tool is pressed in the coil spring forming direction by a standby pressing tool in the vicinity of the forming tool in the forward direction of the wire feeding, and the pressing tool is moved along with the movement of the wire in the feeding direction. It is possible to control the position of rotating while following the movement.

  In addition, in order to form a tightly wound end winding portion, the wire rod feeding direction from the abutting point with the wire rod of the forming tool is used for the leading portion of the wire rod that has been bent and sent in the direction opposite to the coil spring forming direction. In the vicinity of the front, it becomes possible to press in the coil spring forming direction with a pressing tool, and a flat end winding portion can be formed. At the same time, since the pressing tool can be rotated and positioned at a position away from the forming tool, the distance between the position where the wire rod collides with the forming tool and the position where the pressing tool presses the wire rod in the coil spring forming direction is increased. As a result, the amount of pressing to the wire that is pressed with the contact point of the forming tool with the wire as a fulcrum is increased. As a result, the adjustment range of the return amount in the coil spring forming direction of the wire rod that has been bent and sent in the direction opposite to the coil spring forming direction is increased, and the pitch width of the pitch winding portion is adjusted more accurately. be able to. Therefore, it is possible to form a coil spring in which the end winding portion is flat and the pitch width of the pitch portion is accurate.

  In the coil spring manufacturing machine according to the second aspect of the present invention, the pressing tool is attached to the front end of the pressing tool shaft that is movable in the front-rear direction through the base and supported by rotation around the through hole. Therefore, the pressing tool can move in the front-rear direction and rotate around the pressing tool axis. The pressing tool can be pressed in the coil spring forming direction and can be controlled to rotate while the pressing tool is attached to the wire as the wire moves in the feeding direction.

  The coil spring manufacturing machine according to the third aspect of the present invention can control the rotation of the pressing tool around the pressing tool axis by the second servomotor even when the pressing tool moves in the coil spring forming direction. As a result, it is possible to control the position of rotating the pressing tool along the wire.

  In the coil spring manufacturing machine according to the fourth and fifth aspects of the present invention, even when the pressing tool rotates around the pressing tool axis, the pressing tool is reciprocated in the axial direction of the pressing tool axis by the first servo motor. Can do. As a result, it is possible to control the position of rotating the pressing tool along the wire.

  In the coil spring manufacturing machine according to the sixth aspect of the present invention, each pressing tool shaft can be driven to rotate or reciprocate simultaneously by the second servo motor and the first servo motor. Even if the tool is attached, the forward / backward movement and rotation control of the pressing tool can be performed by a pair of the first servo motor and the second servo motor. As a result, it is possible to control the position of rotating the pressing tool along the wire.

  An embodiment of a coil spring manufacturing machine and a coil spring manufacturing method according to the present invention will be described in detail with reference to FIGS. In the following description, the vertical and horizontal directions refer to the vertical and horizontal directions in FIG. Moreover, the front means the front side with respect to the paper surface of FIG.

  As shown in FIGS. 1, 2, 3, and 4, the coil spring manufacturing machine 10 according to the present embodiment includes a plate-like front plate 11 </ b> A that stands vertically, and a rear plate 11 </ b> B that is provided on the rear side in opposition thereto. The wire rod feeding device 20, the forming tool driving devices 30a and 30b, the wire rod cutting device 40, the pressing tool driving device 50, and the mandrel 42 are assembled to the base 11 provided with. Hereinafter, each part will be specifically described.

  The wire feeder 20 is provided with a pair of feed rollers 21 and 21 that sandwich a wire 90 that is a material of a coil spring in the vertical direction. The upper and lower feed rollers 21 and 21 are rotated symmetrically with respect to the axis of the wire rod 90 to be fed (hereinafter referred to as the feed shaft L), thereby feeding the wire rod 90 toward the molding space R. Or it can be pulled back. Since the feed rollers 21 and 21 are driven by a feed roller 21 motor, which is a servo motor (not shown), the feeding amount of the wire 90 to the forming space R can be controlled.

  Further, a wire guide 13 is disposed between the feed rollers 21 and 21 and the forming space R in the feed path of the wire 90. A guide path through which the wire 90 can be inserted is formed in the wire guide 13, and the wire 90 is fed to the forming space R through the guide path.

  Two forming tool driving devices 30 a and 30 b are arranged symmetrically with respect to the feeding axis L of the wire 90. One molding drive device 30a is disposed on the front plate 11A of the base 11 obliquely downward with respect to the feed shaft L of the wire rod 90 via a fixed base 31a, and the other molding drive device 30b is fixed. It is disposed obliquely upward with respect to the feeding axis L of the wire 90 via the base 31b.

  On the fixed bases 31a and 31b, sliders 32a and 32b are engaged with the molding space R so as to be linearly movable, and molding tool driving motors 34a and 34b, which are servo motors, are provided on the opposite side of the molding space R. ing. Forming tools 35a and 35b for forming the wire rod 90 to be fed are provided on the forming space R side of the sliders 32a and 32b, and the forming tool driving motor 34a is provided on the opposite side by ball screw mechanism portions 33a and 33b. , 34b.

  By forming the forming tool driving devices 30a and 30b as described above, the forming tools 35a and 35b are driven obliquely from the lower right side with respect to the forming space R by the driving of the forming tool driving motors 34a and 34b. The advancing and retreating operation is performed, and the other forming tool 35b moves back and forth from the upper right side with respect to the forming space R.

  As shown in FIG. 4, the pressing tool driving device 50 includes a pair of pressing tool shafts 51, 51 provided so as to protrude symmetrically from the front plate 11 </ b> A of the base 11 with the wire guide 13 interposed therebetween. The pressing tool 14 attached to the tip of the pressing tool shaft 51 toward the molding space R via the pressing tool mounting block 14A, and a pressing tool shaft rotation drive motor 54 of the servo motor described later (the second servo motor of the present invention) ) And a servo motor pressing tool shaft back-and-forth motion drive motor 59 (first servo motor of the present invention). The pressing tool shafts 51, 51 are movable in the front-rear direction through the bearings 11b, 11b in the through holes 11a, 11a provided symmetrically through the front plate 11A and the rear plate 11B of the base 11. The wire 90 is supported so as to be rotatable around the through hole, and is provided perpendicular to the feed shaft L of the wire 90.

  The pressing tool shafts 51 and 51 also protrude to the rear side of the rear plate 11B, and spur gears 52 and 52 are fixedly attached to the rear end sides of the pressing tool shafts 51 and 51, respectively. A wide spur gear 53 that meshes with both the spur gears 52 and 52 is attached to a pressing tool shaft rotation drive motor 54 that is attached to the rear of the rear plate 11B via a bracket 54A via a speed reducer 54B. The wide spur gear 53 meshes with both the spur gears 52 and 52 and can move relative to the spur gears 52 and 52 in the axial direction.

  A connecting plate 56 that supports the pressing tool shafts 51, 51 so as not to be relatively movable in the axial direction and to be rotatable is attached across the pressing tool shafts 51, 51 at an intermediate position between the pressing tool shafts 51, 51. Yes. One end of a connecting rod 57 is attached to an intermediate position portion of the connecting plate 56 between the pressing tool shafts 51 and 51 so as to be rotatable about the pin 55 as a fulcrum. The other end of the connecting rod 57 is rotatably attached to a protruding cylindrical portion 58A provided at an eccentric position of an eccentric plate 58 attached to a pressing tool shaft longitudinal movement drive motor 59 described later via a speed reducer 59A. . The pressing tool shaft forward / backward drive motor 59 and the speed reducer 59A attached to the output side thereof are attached to the rear plate 11B via the bracket 59B with the axis thereof being perpendicular to the pressing tool shafts 51 and 51.

  The pressing tool driving device 50 has such a configuration, and the rotational direction position of the pressing tool shafts 51 and 51 is controlled by the rotation control of the pressing tool shaft rotation driving motor 59, and the pressing tool shaft forward / backward driving motor 59 is controlled. The front-rear direction position of the pressing tool shafts 51 and 51 is controlled by the rotation control. Note that the pressing tool 14 is attached to the upper pressing tool shaft 51 in the case of a right-handed spring and to the lower pressing tool shaft 51 in the case of a left-handed spring. By controlling the rotational direction position and the front-rear direction position, the pressing tool 14 can control the position in the front-rear direction and the rotational direction position about the pressing tool shaft 51.

  The wire rod cutting device 40 is attached to the front plate 11 </ b> A of the base 11 above the mandrel 42. A cutting tool driving servomotor 41, which is a driving source of the cutting tool 47, is attached to the rear of the front plate 11A via a speed reducer. An eccentric disk 42 having a central axis in the front-rear direction is attached to the output shaft of the speed reducer, and an eccentric column 42A having a circular cross section is erected forward at a position eccentric from the center of the eccentric disk 42. Has been.

  On the other hand, a linear guide rail 43 is fixed to the front surface of the base 11 with a bolt (not shown). The linear motion guide rail 43 is provided so as to extend in the vertical direction, and a slider 45 is provided on the linear motion guide rail 43 so as to be movable back and forth with respect to the molding space R. A cutting tool 47 having a prismatic shape is fixed to the slider 45 at the end on the molding space R side with the longitudinal direction directed toward the molding space R.

  In addition, a support pin 45A is erected on the slider 45 from substantially the center in parallel with the eccentric support 42A. The support pin 45 </ b> A is connected to the eccentric support 42 </ b> A via the link member 46. The link member 46 has through holes 46A and 46B formed at both ends thereof, and an eccentric support 42A is fitted into one through hole 46A through a bearing, and a support pin 45A is fitted into the other through hole 46B. Is fitted.

  The eccentric support 42A, the link member 46, the slider 45, and the like constitute a crank mechanism, and the rotation operation of the cutting tool driving motor 41 is converted into a linear operation of the cutting tool 47. Then, the cutting tool 47 moves forward and backward toward the forming space R along with the forward and backward movement of the slider 45. Thereby, after the coil spring of a predetermined shape is formed, when the cutting tool 47 enters the forming space R side, the wire 90 is cut between the edge of the cutting tool 47 and the edge of the mandrel tool 42, and the coil The spring is cut off from the subsequent wire 90.

  FIG. 8 is an electrical configuration diagram of the coil spring manufacturing machine 10. As described above, the feed roller 21, the forming tools 35a and 35b, the cutting tool 47, and the pressing tool 14 are the feed roller 21 motor, the forming tool driving motors 34a and 34b, the cutting tool driving motor 41, and the pressing tool, respectively. The shaft rotation drive motor 54 and the pressing tool shaft forward / backward drive motor 59 operate as drive sources. Servo amplifiers 80A, 80B, 80C, 80D, 80E, and 80F of these motors are housed in the control panel 87 together with the main control circuit 85. A display 88 and a keyboard 89 are connected to the main control circuit 85.

  The main control circuit 85 storing the operation sequence program obtains input signals from various sensors (not shown) and issues operation commands to the servo amplifiers 80A, 80B, 80C, 80D, 80E, and 80F. Based on this command, the servo amplifiers 80A, 80B, 80C, 80D, 80E, and 80F include a feed roller 21 motor, molding tool drive motors 34a and 34b, a cutting tool drive motor 41, a pressing tool shaft rotation drive motor 54, Further, the driving power is supplied to the pressing tool shaft longitudinal movement drive motor 59. The display 88 displays the current number of coil springs produced, the type of coil springs being produced, and the like. In addition, by operating the keyboard 89, the start and stop of production of the coil spring manufacturing machine 10, switching between manual / automatic operation, input of the target number of production, and the type, such as the shape and length of the coil spring to be produced. A control program can be input and stored in the main control circuit.

Hereinafter, the operation of the coil spring manufacturing machine 10 configured as described above will be described.
The feed rollers 21 and 21, the wire guide 13, the forming tools 35 a and 35 b, the core 42, the cutting tool 47, and the pressing tool 14 are selected by setting up in advance according to the wire diameter and outer diameter of the coil spring to be formed, Or the position is positioned. In the case of FIG. 1, the layout is a case of forming a right-handed coil spring, and the case of forming a right-handed coil spring will be described below. In the case of a left-handed coil spring, it is necessary to replace the forming tools 35a and 35b, the mandrel 42, and the pressing tool 14 at positions symmetrical with respect to the feeding axis L of the wire 90.

  When the coil spring manufacturing machine 10 is activated, the feed rollers 21 and 21 sandwiching the wire rod 90 are rotated in a symmetrical direction by driving the motor for the feed roller 21 and the wire rod 90 is fed out toward the right molding space R in FIG. It is. The fed wire rod 90 is sequentially brought into contact with the forming tools 35a and 35b, curved around the mandrel 42 to the upper side of the feed shaft L of the wire rod 90, and a coil spring having a set outer diameter is formed. The outer diameter of the coil spring is set by advancing and retracting the forming tools 35a and 35b toward the forming space R by driving the forming tool driving motors 34a and 34b.

  The forming tools 35a and 35b have a positional relationship between the wire guide 13 and the forming tools 35a and 35b in order to bring the end winding portion into close contact with each other and to stabilize the pitch width of the pitch winding portion. The position (abutting point) is deviated in the coil spring forming direction with respect to the wire outlet position in the wire guide 13, and the wire is formed in the direction opposite to the coil spring forming direction. For this reason, the wire rods fed from the wire rod guides sequentially to the contact positions of these wire rods, and the wire rods are spirally bent in the direction opposite to the coil spring forming direction. The pressing tool 14 stands by in the vicinity of the forming tool 35b in the front of the wire feeding direction after abutting against the forming tool 35b.

  5, 6 and 7 are enlarged perspective views in the vicinity of the molding space R. FIG. The wire rod 90 delivered from the wire rod guide 13 abuts on the forming tools 35a and 35b and is formed into a spiral shape. FIG. 5 shows a state in which the pressing tool 14 is at an initial setting position on the counterclockwise side around the rear end in the front-rear direction and the pressing tool shaft 51. FIG. 6 shows that the pressing tool 14 can move forward and backward by a predetermined amount with the rotation direction about the pressing tool shaft 51 as it is, press the sent wire 90, and form the wire 90 into a flat spiral shape. Shown when in proper position. FIG. 7 shows a state in which the pressing tool 14 is further advanced by a predetermined amount in the front-rear direction and is rotated clockwise by a predetermined amount about the pressing tool shaft 51 to be in a pitch winding position where a coil having a predetermined pitch can be formed. Indicates.

  As shown in FIGS. 5, 6, and 7, wire rod sliding grooves 39 a and 39 b are formed on the tip surfaces of the prismatic forming tools 35 a and 35 b so as to follow the wire rod formed in a spiral shape. The wire 90 fed to the forming space R is pressed against the inner surfaces of the wire sliding contact grooves 39a and 39b of the forming tools 35a and 35b, and is plastically deformed in an arc shape to form a coil spring. In FIG. 5, the pressing tool 14 is retracted to a position where it does not come into contact with the wire rod 90. When the wire rod 90 is fed into the forming space R in this state, the wire rod 90 is pressed against the inner surfaces of the wire rod sliding contact grooves 39a and 39b. In addition, like a wire 90a ′ indicated by a two-dot chain line, the wire is bent in a spiral shape in the direction opposite to the coil spring forming direction.

  When the coil spring formed in the previous cycle is cut, the remaining wire 90 remains in contact with the forming tools 35a and 35b as indicated by 90a in FIG. At this time, the remaining head portion of the wire 90 is a part of a flat portion formed so that the end winding portion of the coil spring becomes flat in the previous cycle as will be described later. A flat spiral is formed from the abutting point 35b to the wire tip 90a (FIG. 5). At this time, the pressing tool 14 is retracted to a position where it does not contact the wire 90.

  When the wire 90 is fed out and the leading portion 90a of the wire 90 comes to the position of the standby pressing tool 14 in the vicinity of the forming tool 35b, the pressing tool 14 is displaced in the coil spring forming direction by the control of the pressing tool shaft longitudinal drive motor 59. Further, in synchronization with the movement of the wire 90 from the abutting point of the forming tool 35b, the pressing tool shaft is rotated while the pressing tool 14 is displaced in the coil spring forming direction under the control of the pressing tool shaft forward / backward drive motor 59. The pressing tool 14 is rotated around the pressing tool shaft 51 parallel to the coil spring forming direction by the drive motor 54, and the pressing tool 14 is moved to the end winding position shown in FIG. It moves so as to follow the wire 90 while pressing the portion 90a in the coil spring forming direction. As a result, the wire rod sent so as to be spirally bent in the direction opposite to the coil spring forming direction is pressed back by the pressing tool 14 with its leading portion 90a being pressed in the coil spring forming direction. As the wire is fed, the wire 90 is formed to be a flat surface perpendicular to the coil spring forming direction, and a part of the flat portion 91b of the coil spring shown in FIG. 19 is formed (FIG. 7). After that, the pressing tool 14 positioned at the end winding position presses the wire 90 sent out, the remaining flat portion 91b is formed, and the front end winding portion 91a is formed. Thereafter, the pressing tool 14 is displaced in the coil spring forming direction under the control of the pressing tool shaft back and forth drive motor 59, and the pitch portion 91c having a predetermined pitch is moved to a pitch winding position where it can be formed.

  Or you may make it shape | mold the end winding part 91a as follows. When the wire 90 is fed out and the leading portion 90a of the wire 90 reaches the position of the standby pressing tool 14 in the vicinity of the forming tool 35b, the pressing tool 14 moves forward by a predetermined amount under the control of the pressing tool shaft longitudinal drive motor 59, The leading portion is pressed in the coil spring forming direction. As a result, the wire rod sent so as to be spirally bent in the direction opposite to the coil spring forming direction is pressed back by the pressing tool 14 with its leading portion 90a being pressed in the coil spring forming direction. As the wire is subsequently fed out, the wire 90 is formed to be a flat surface perpendicular to the coil spring forming direction, and the flat portion 91b of the front end portion of the coil spring shown in FIG. 19 is formed (FIG. 6). ). Further, the front end turn portion 91a is formed along with the subsequent feeding of the wire. After that, while the pressing tool 14 is displaced in the coil spring forming direction by the control of the pressing tool shaft back and forth drive motor 59, the pressing tool shaft 51 is parallel to the coil spring forming direction by the pressing tool shaft rotation driving motor 54. The pressing tool 14 may be moved to a pitch winding position where the pitch portion 91c having a predetermined pitch can be formed.

  And after the pressing tool 14 moves to a pitch winding position, the wire 90 is sent out in the state which pressed the wire 90 with the pressing tool 14, and the pitch winding part 91c of a predetermined pitch is shape | molded. When the pitch winding portion 91c is formed, the pressing tool 14 is displaced to the opposite side to the coil spring forming direction by the control of the pressing tool shaft longitudinal movement drive motor 59 while feeding the wire 90, and is positioned at the end winding position. In the state where the pressing tool 14 is in this end winding position, the wire rod 90 is further fed out, and the rear end winding portion 91d is formed flat.

  The diameter of the coil spring can be adjusted by driving the forming tool driving motors 34a and 34b and moving the forming tools 35a and 35b forward and backward relative to the forming space R.

  When the rear end turn portion 91d is formed, the cutting tool 47 waiting on the upper side is lowered, and the coil spring is separated from the wire 90 by the cutting blade and the cutting blade of the mandrel 42. At this time, since the remaining leading portion 90a of the wire rod 90 is a part of the flat portion formed so that the end winding portion on the back side of the coil spring is flat, the wire rod tip 90a from the contact point of the forming tool 35b. Until then, it is a flat spiral shape (FIG. 5).

  Hereinafter, an example of a method of manufacturing a coil spring using the coil spring manufacturing machine 10 configured as described above will be described in detail with reference to FIGS. (A) of each figure is a top view, (b) is a front view.

  When the coil spring formed in the previous cycle is cut and cut from the wire rod 90 by the cutting tool 47 and the mandrel 42, the cutting tool 47 rises to the retracted position and is fed out from the wire rod guide 13, and the wire rod is formed into the forming tool. It remains around the mandrel 42 in a curved state in contact with 35a and 35b. The pressing tool 14 is waiting at a standby position in the vicinity of the feeding direction after the forming tool 35b is abutted. At this time, the angle formed by the axis of the pressing tool 14 and the feeding axis L is α1. At this time, the wire 90 is curved flatly around the mandrel 42, and is flat and spiral from the contact point of the forming tool 35b to the wire tip 90a (FIGS. 9 and 5).

  In this state, the wire 90 is fed while sequentially abutting against the forming tools 35a and 35b by driving the motor for the feed roller 21, and when the leading portion 90a of the wire 90 reaches the front surface of the pressing tool 14, the pressing tool 14 is moved by a predetermined amount. It moves to move forward (FIG. 10). The pressing tool 14 is positioned at a position where the end turn portion can be formed flat, and feeds the wire 90. The wire 90 is sent out while being curved in the delivery direction of the wire 90 so as to become flat after the springback (FIG. 11). In synchronization with the movement of the wire 90 in the feeding direction, the pressing tool 14 is moved by the pressing tool shaft rotation drive motor 54 while the pressing tool 14 is displaced in the coil spring forming direction by the control of the pressing tool shaft forward / backward drive motor 59. It rotates around an axis parallel to the molding direction and moves the pressing tool 14 to the end winding position. During this movement, the pressing tool 14 moves so as to follow the wire 90 while pressing the leading portion 90a of the wire 90 in the coil spring forming direction, and forms a part of the flat portion 90b of the coil spring. By this movement, the angle formed by the axis of the pressing tool 14 and the feeding axis L becomes α2. (FIG. 12, FIG. 7).

  Thereafter, the pressing tool 14 at the end winding position presses the wire 90 being fed out, the remaining flat portion 90b is formed, and the front end winding portion 91a is formed (FIG. 13). Thereafter, the pressing tool 14 is displaced in the coil spring forming direction under the control of the pressing tool shaft longitudinal movement drive motor 59, and the pitch portion 91c having a predetermined pitch is moved to a pitch winding position where it can be formed (FIG. 14). The wire rod 90 is sent out in a state where the wire rod 90 is pressed by the pressing tool 14 moved to the pitch winding position, and a pitch winding portion 91c having a predetermined pitch is formed (FIG. 15). When the pitch winding portion 91c is formed, the pressing tool 14 is displaced to the opposite side to the coil spring forming direction under the control of the pressing tool shaft longitudinal movement drive motor 59 while feeding the wire 90 (FIG. 16). In the state where the pressing tool 14 is in the end winding position, the wire rod 90 is further fed to form the end winding portion 91d (FIG. 16). When the rear end turn portion 91d is formed, the cutting tool 47 waiting on the upper side is lowered, and the coil spring 91 is separated from the wire rod 90 by the cutting blade and the cutting blade of the mandrel 42 (FIG. 17). ). The cutting tool 47 rises to the retracted position and is fed out from the wire guide 13, and the wire remains in the periphery of the mandrel 42 in a state of being abutted and curved with the forming tools 35a and 35b (FIG. 18). The pressing tool 14 stands by at a standby position near the feeding direction from the abutting point of the forming tool 35b (FIG. 9).

  As described above, the pressing tool 14 is positioned in the vicinity of the forming tool by the positioning in the front-rear direction of the pressing tool 14 and the rotational positioning control around the pressing tool shaft 51 parallel to the coil spring forming direction, and the end turn is in close contact. In order to form the portion and to obtain a stable pitch width, the pressing tool 14 presses the leading portion 90a of the wire 90 that has been bent and sent in the direction opposite to the coil spring forming direction in the coil spring forming direction. By doing so, it is possible to form a portion of the wire that is later formed and sent out from the point of contact with the wire of the forming tool 35b into a flat end winding portion from the beginning, and no gap is generated in the end winding portion of the compression spring. An accurate coil spring can be formed. After forming the second coil spring, when forming the end winding portion 91d on the rear side of the coil spring formed in the previous cycle, from the point of contact with the wire rod of the forming tool to the leading portion 90a of the wire rod already. Is shaped flat. Therefore, the end winding portions at both ends can be formed flat after the second coil spring is formed.

At the same time, by rotating the pressing tool 14 to a position away from the forming tool 35b, a position where the wire 90 abuts the forming tool 35b and a position where the pressing tool 14 presses the wire 90 in the coil spring forming direction. , And the pressing amount to the wire 90 that is pressed with the contact point of the forming tool 35b with the wire 90 as a fulcrum is increased. As a result, the adjustment width of the return amount in the coil spring forming direction of the wire 90 which has been bent and sent in the direction opposite to the coil spring forming direction is increased, and the pitch width of the pitch winding portion 91c is more accurately determined. Can be adjusted.
Therefore, there is an effect that a coil spring with a high pitch width of the pitch portion can be formed.

[Other Embodiments]
In this embodiment, when the leading portion 90a of the wire rod 90 reaches the front surface of the pressing tool 14, the pressing tool 14 is moved forward by a predetermined amount, the end winding portion is positioned at a position where it can be formed flat, and the feeding direction of the wire rod 90 In synchronization with the movement, while the pressing tool 14 is moved to the end winding position, after forming a part of the flat portion 90b of the coil spring, the pressing tool 14 at the end winding position presses the wire 90 that is sent out, The remaining flat portion 90b is formed and the front end turn portion 91a is formed. However, after the press tool 14 forms the end turn portion 91a in a position where the end turn portion can be formed flat, press The tool 14 may be moved to the pitch winding position to form the pitch portion 91c.

In the present embodiment, a forming tool in which an abutting point with the wire rod 90 is provided in a position forward of the wire rod outlet position of the wire rod guide 13 and closer to the coil spring forming direction on the wire rod 90 fed from the wire rod guide 13 toward the forming region R. 35a and 35b are brought into contact with each other, and the wire rod 90 is bent along the periphery of the mandrel 42 in a direction opposite to the coil spring forming direction, but the wire rod sliding contact formed on the forming tools 35a and 35b is performed. By changing the inclination of the grooves 39a and 39b, the wire may be formed into a curve in the direction opposite to the coil spring forming direction.
The coil spring manufacturing machine and the coil spring manufacturing method according to the present invention are not limited to the embodiments described above, and can be configured in various forms without departing from the gist of the present invention. it can.

Front view of the coil spring manufacturing machine of the present invention AA sectional view of FIG. B arrow view of FIG. Molding space R neighborhood view Enlarged perspective view near molding space R Enlarged perspective view near molding space R Enlarged perspective view near molding space R Electrical configuration diagram Operation explanation Operation explanation diagram Operation explanation diagram Operation explanation Operation explanation diagram Operation explanation Operation explanation diagram Operation explanation diagram Operation explanation Operation explanation diagram External view of coil spring according to the embodiment External view of coil spring according to conventional technology

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Coil spring manufacturing machine 11 Base 13 Wire rod guide 14 Press tool 20 Wire rod feeder 21 and 21 Feed roller 30a, 30b Molding tool drive 34a, 34b Molding tool drive motor 35a, 35b Molding tool 40 Wire rod cutting device 41 Cutting Tool drive motor 42 Mandrel 47 Cutting tool 50 Press tool drive device 51, 51 Press tool shaft 54 Press tool shaft rotation drive motor (second servo motor)
59 Press tool shaft longitudinal drive motor (first servo motor)
90 Wire R Forming space

Claims (7)

A coil spring manufacturing machine that forms a coil spring by abutting a wire rod fed from a wire rod guide to a molding region with a molding tool, and separates the coil spring from the wire rod in cooperation with a cutting tool and a mandrel,
Wire rod feeding means for feeding the wire rod from the wire guide toward the forming region;
The wire rod fed from the wire rod guide is brought into contact with the wire rod provided at a position closer to the coil spring forming direction than the wire rod outlet position of the wire rod guide, and the wire rod is placed around the mandrel. A forming tool for forming a curve in a direction opposite to the forming direction;
A pressing tool that is reciprocally driven in the coil spring forming direction by the first servo motor and is rotated around an axis parallel to the coil spring forming direction by the second servo motor;
A control unit is provided that controls the position of the pressing tool so that the wire can be pressed in the forward direction of the wire from the contact point of the forming tool with the wire and can be rotated along the wire. Coil spring making machine.     The pressing tool includes a pressing tool shaft supported in a through hole provided through the base perpendicularly to a wire feeding axis so as to be movable in the front-rear direction and rotatable about the through hole. The coil spring manufacturing machine according to claim 1, wherein the coil spring manufacturing machine is attached to a front end.   A first spur gear is coaxially attached to the pressing tool shaft, and a second servo motor is attached to the output shaft with a second spur gear meshing with the first spur gear so as to be relatively movable in the axial direction. The coil spring manufacturing machine according to claim 2, wherein the coil spring manufacturing machine is attached to a table, and the pressing tool shaft is rotationally driven by the second servomotor.   The pressing tool shaft is provided with a connecting plate that is restricted from relative movement in the axial direction of the pressing tool shaft and rotatably supports the pressing tool shaft, and the connecting plate includes the connecting plate. 4. The coil spring manufacturing machine according to claim 2, wherein the first servo motor that reciprocates in the axial direction of the pressing tool shaft is connected.   An eccentric plate is attached to the output shaft of the first servomotor so that the other end of the connecting rod, one end of which is rotatably attached to the connecting plate, can be rotated to an eccentric position. 5. The coil spring manufacturing machine according to claim 2, wherein the connecting plate is reciprocated in the axial direction together with the pressing tool shaft through the eccentric plate and the connecting rod by rotation of a motor. . The pressing tool shafts are provided in pairs at symmetrical positions with respect to the center line of the wire guide,
6. The coil spring manufacturing machine according to claim 3, wherein the second servo motor and the first servo motor are capable of simultaneously rotating or reciprocating the pressing tool shafts. A coil spring manufacturing method for forming a coil spring by abutting a wire rod fed from a wire rod guide to a molding region with a molding tool,
The wire rod fed from the wire rod guide toward the forming region is abutted with the forming tool provided with an abutting point with the wire rod at a position forward of the wire rod outlet position of the wire rod guide and closer to the coil spring forming direction, While the wire rod is bent in the direction opposite to the coil spring forming direction around the mandrel, a standby pressing tool advances in the vicinity of the wire feed forward direction of the forming tool, and the coil spring forming direction A step of pressing the tip of the wire that is shaped and sent out in the opposite direction to the coil spring in the coil spring molding direction and positioning the flat end winding portion at a position where it can be molded,
While the wire rod is being fed, the pressing tool is rotated in the wire rod feed direction while the wire rod is being flatly formed and moved forward to the coil spring molding direction to move the flat portion to the end winding position where the flat portion can be formed. A step of forming the end turn part,
A step of advancing the pressing tool from the end winding position to the pitch winding position and then feeding the wire a predetermined amount to form a pitch winding portion having a predetermined pitch and a predetermined length;
Forming the flat end winding portion on the rear side by feeding the wire after the pressing tool is retracted from the pitch winding position to the end winding position opposite to the coil spring forming direction;
A step of reciprocating a cutting tool toward the mandrel and separating the formed coil spring from the wire in cooperation with the cutting blade of the mandrel and the cutting blade of the cutting tool;
And a step of moving the pressing tool in the direction opposite to the coil spring forming direction and rotating the wire rod from the forming tool in a backward direction to return to the original position. .

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