JPH0829378B2 - Tal coil spring manufacturing equipment - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil spring having a conical winding portion formed at one end thereof and a similar conical winding portion formed at the other end thereof. The present invention relates to an apparatus for manufacturing a coil spring having a "shape" shape.

Prior Art As shown in FIG. 1, the center of the body has a maximum diameter d,
A coil spring 10 wound so as to gradually converge into a conical shape toward both ends in the axial direction is preferably used as a chassis spring for independent suspension of an automobile or the like.
Strictly speaking, the winding portions formed respectively at both ends of the coil spring are, in a strict sense, a truncated cone shape whose tip is cut perpendicularly to the axis or a bullet-shaped shape that converges in a curvilinear manner. It has a "tal" shape or a "spindle" shape. Therefore, in the present specification, the coil spring wound so as to gradually converge into a conical shape toward the both ends will be referred to as a "tal-shaped coil spring" hereinafter.

Problems to be Solved by the Invention As a method of manufacturing this tal-shaped coil spring, various means have been proposed in the past, but in any case, the number of molding steps increases and the structure itself of the manufacturing apparatus becomes complicated,
In addition, it was not possible to perform winding forming at a desired lead angle and pitch, and there was a problem that the finished shape of a product was varied. That is, since the both ends of the tal shaped coil spring are convergently wound in a conical shape,
As in the case of forming a normal cylindrical coil spring, it is difficult to complete all winding forming in one step using a cored bar (mandrel).

In this regard, the invention described in JP-A-57-11743 and the corresponding invention disclosed in U.S. Pat. No. 4,424,695 have a forming member 18 in which a conical spiral step portion is formed with a required number of windings. Is provided in the apparatus, the molding member 18 is inserted into the gap in the cylindrical winding portion of the coil spring, and then the coil wire is forcibly wound around the conical spiral step portion, so that the cylindrical portion of the coil spring is conical. It has been proposed to form a coiled winding. However, according to the device according to this proposal, the forming member 18 having the conical spiral step described above is
The size of the coil spring is limited to such a size that it can be inserted into the gap in the cylindrical winding portion of the coil spring. Therefore, there is a problem in that it is possible to form only a conical winding portion having about two to two and a half turns.

SUMMARY OF THE INVENTION Therefore, according to the present invention, a coil spring in which a first conical winding portion is formed at one end and the other winding portions extend in parallel with a maximum diameter is first manufactured in a separate process. The second conical portion can be suitably formed on the other end side of this unfinished coil spring (hereinafter referred to as "half-finished coil spring"), and the forming jig used is a cylindrical winding portion. There is provided a device for manufacturing a tall coil spring, which is not limited to the size that can be inserted into the gap of the second conical portion, and in which the number of windings of the second conical portion can be easily set to three or more as desired. The purpose is to do.

Means for Solving the Problems In order to overcome the above problems and preferably achieve an intended purpose, the present invention has a first conical winding part formed at one end, and the other winding parts are maximum. A semi-finished coil spring extending in parallel with a diameter, which is a device for manufacturing a tal coil spring by forming a second conical part on the parallel winding part, which is composed of a pair of horizontal rollers arranged in parallel. Spring supporting means capable of supporting the semi-finished coil spring between the rollers, and the spring supporting means are disposed laterally of the spring supporting means at substantially the same level,
With respect to the parallel winding portion of the semi-finished product coil spring extending from the horizontal roller, a clamp means for releasably grasping the forming start portion of the second conical portion, and a slidable arrangement on the fixed frame of the coil spring manufacturing apparatus. A forward / backward frame that is driven forward / backward in a direction parallel to the central axis of the semi-finished product coil spring supported by the spring support means; and a slide frame disposed slidably on the forward / backward frame and substantially horizontal in a direction crossing the central axis of the semi-finished product coil spring. A horizontally movable frame that is driven forwards and backwards, a vertically movable frame that is slidably disposed on the horizontally movable frame and is vertically driven forward and backward in a direction crossing the central axis of the semi-finished product coil spring. The semi-finished coil spring is rotatably supported substantially horizontally and abuts from the inside of a portion of the semi-finished product coil spring that passes through a required lead to form the semi-finished product. A first roller that is rotationally driven in the winding direction of the product coil spring; and a vertically movable body that is vertically movable in the movable frame and abuts from outside the portion of the semi-finished coil spring that passes through the required lead from the clamp portion, It comprises a freely rotatable second roller and a third roller for pinching the semi-finished product coil spring together with the first roller, and the clamping means grips the forming start portion of the semi-finished product coil spring supported by the spring support means. At the same time, the second roller and the third roller are lowered toward the first roller to clamp the portion of the semi-finished coil spring that passes through the required lead from the molding start portion, and the first roller is wound in the semi-finished coil spring winding direction. To move the movable frame up and down substantially vertically in a direction traversing the central axis of the semi-finished coil spring while being driven to rotate. By applying a planar spiral motion to the first roller, and at the same time, driving the advancing / retreating frame backward in a direction parallel to the central axis of the semi-finished coil spring, thereby imparting a conical spiral motion to the first roller as a whole. It is characterized in that it is configured to.

Similarly, in order to overcome the above problems and preferably achieve the intended purpose, another invention of the present application is that a first conical winding portion is formed at one end, and the other winding portions are parallel with a maximum diameter. An apparatus for producing a tall coil spring by forming a second conical portion on a parallel winding portion of a semi-finished coil spring extending in a vertical direction, comprising a pair of horizontal rollers arranged in parallel. A spring support means capable of supporting the semi-finished product coil spring, and a spring support means disposed laterally of the spring support means at substantially the same level;
With respect to the parallel winding portion of the semi-finished product coil spring extending from the horizontal roller, a clamp means for releasably grasping the forming start portion of the second conical portion, and a slidable arrangement on the fixed frame of the coil spring manufacturing apparatus. A forward / backward movement frame that is driven forward / backward in a direction parallel to the central axis of the semi-finished product coil spring supported by the spring support means; A horizontally movable frame that is driven forwards and backwards, a vertically movable frame that is slidably disposed on the horizontally movable frame and is vertically driven forward and backward in a direction crossing the central axis of the semi-finished product coil spring. The semi-finished coil spring is rotatably supported substantially horizontally and abuts from the inside of a portion of the semi-finished product coil spring that passes through a required lead to form the semi-finished product. A winding guide member that is rotationally driven in the winding direction of the product coil spring, and a vertically movable body that is vertically movable in the movable frame and that contacts the portion of the semi-finished coil spring that passes through the required lead from the outside. A freely rotatable second portion for pressing the semi-finished product coil spring with the winding guide member
A semi-finished product coil spring supported by the spring supporting means, the clamping start portion is gripped by the clamping means, and the second roller and the third roller are lowered toward the winding guide member. , A portion of the semi-finished coil spring that passes through a required lead from the molding start portion is clamped, and while the winding guide member is rotationally driven in the winding direction of the semi-finished coil spring, the lifting / lowering movable frame moves the central axis of the semi-finished coil spring. By advancing in a direction substantially perpendicular to the direction, the synthetic spiral motion is imparted to the winding guide member, and at the same time, the advancing / retreating frame is driven backward in the direction parallel to the central axis of the semi-finished product coil spring, In addition, the winding guide member is configured to give a conical spiral motion.

EXAMPLES Next, a device for manufacturing a tall coil spring according to the present invention will be described with reference to the accompanying drawings, with reference to preferred examples. 2 to 5 show a preferred first embodiment of the manufacturing apparatus according to the present invention. That is, the illustrated tal-shaped coil spring manufacturing apparatus has a spring supporting means 18 composed of a pair of horizontal rollers 16 and 16 arranged in parallel, and on this spring supporting means 18, a first conical winding is formed at one end described above. Part 12
The semi-finished product coil spring 14, which has been preformed, can be placed. Further, at substantially the same level as the spring supporting means 18, a clamping means 20 for strongly gripping the wire of the semi-finished product coil spring 14 so as to be released and held is disposed at the right side position in the drawing. When the semi-finished product coil spring 14 is placed on the spring supporting means 18, a portion (hereinafter referred to as "parallel winding portion") 14a extending in parallel with its maximum diameter extends from the right end portion of the roller 16. At the position and at the required portion P _{1 where} the molding of the second conical portion should be started, it is gripped by the clamping means 20 as described below.

Further, on the right side of the spring supporting means 18 and the clamping means 20 in the drawing, a molding jig 22 capable of pinching the parallel winding portion 14a of the semi-finished product coil spring 14 and the molding jig 22 as described later.
Drive means 24 for imparting a conical spiral movement are respectively arranged in a required relationship. For example, as shown in FIG. 2 (b), the molding jig 22 used in the apparatus according to the first embodiment is
The semi-finished product is composed of a first roller R ₁ capable of rotating inside the parallel winding portion 14a of the coil spring 14, and a second roller R ₂ and a third roller R ₃ capable of being driven to rotate outside the parallel winding portion 14a. As described later, the forming jig 22 performs a conical spiral motion,
When performing centripetal movement toward the central axis C of the coil spring 14,
These two second and third rollers R ₂ , R ₃ are
It can be moved toward the roller R ₁ to reduce its axial distance.

FIG. 4 shows a schematic structure of the driving means 24.
The first roller R ₁ is rotatably and horizontally rotatably supported by the vertically movable frame F ₁ via a rotary shaft 26 provided integrally with the first roller R ₁ from a second motor M ₂ fixed to the frame F _1. Is transmitted to the rotary shaft 26 via the gears 28 and 30, so that the coil spring 14 is rotationally driven in the winding direction. Further, as shown in FIG. 5, the second roller R ₂ and the third roller R ₃ each having an arcuate groove formed around each circumferential surface are freely rotatable by a required distance from the supporting member 32 having the illustrated shape. Is pivoted to. The supporting member 32 can be vertically moved up and down by an appropriate movable supporting means (a guide bar and a groove for allowing the fitting thereof, etc. are proposed for the frame F ₁ but not shown because they have known configurations). It is supported and is driven up and down by a first motor M ₁ arranged vertically to the frame. Ie motor M ₁
When the motor is driven, the screw shaft 31 provided in the motor and the nut 33 fixed to the support member 32 cooperate with each other to move the second
And the third rollers R ₂ and R ₃ are close to the first roller R ₁ .
It can move away from one another.

The vertically movable frame F ₁ is supported by the horizontally movable frame F _{2 so as} to be vertically movable by appropriate movable supporting means. And the frame F ₁ is the horizontal movable frame.
Under the cooperation of the screw shaft 34 provided on the third motor M ₃ arranged on F ₂ and the nut 36 fixed on the frame F ₁ , the elevation drive control is performed at a required timing.

Further, the horizontally movable frame F ₂ will be described later, for example, via a dovetail groove structure, so that the horizontally movable frame F ₂ can move in a direction transverse to the central axis C of the semi-finished product coil spring 14 (mounted on the spring supporting means 18). It is supported by the forward / backward frame F ₃ . Then, by applying a driving force by the illustrated fourth motor M ₄ , the horizontally movable frame F ₂ is moved in a direction horizontal to the advancing / retreating frame F ₃ and transverse to the central axis C of the semi-finished product coil spring 14. It can be done.

Further, the advancing / retreating frame F ₃ is suspended and supported by a frame F ₄ forming a part of the main body of the apparatus through an appropriate movable supporting means, and is advanced in a direction parallel to the central axis C of the semi-finished product coil spring 14 (direction of arrow A). And can move backward (direction of arrow B). That is, the fifth motor fixed to the frame F ₄
Screw shaft 38 on M ₅ and nut fixed on frame F ₃
Under the cooperative action of 40, it is possible to move back and forth in the direction of arrow A or in the direction of arrow B at the required timing.

The first motor M ₁ to the fifth motor M ₅ described above are individually controlled to rotate and stop by a required timing command obtained from a control circuit (not shown). The individual items are as follows.

First motor M ₁ : The second roller R ₂ and the third roller R ₃ are moved toward the first roller R ₁ at a required timing.

Second motor M _2: a first roller R _1, imparts rotation to the winding direction of the semi-finished products coil spring 14.

Third motor M ₃ and a fourth motor M _4: the first roller R _1, planar spiral (point to pivot about a point on the plane, occur curve by moving away from the center continuously) movement Synthesis is added.

Fifth motor M ₅ : The forming jig 22 is provided with a reciprocating movement in the axial direction parallel to the central axis C of the semi-finished product coil spring 14.

Therefore, when the third motor M ₃ to the fifth motor M ₅ are driven synchronously, the above-mentioned motions in and are combined,
A conical helix (a solid curve generated by the point of turning on the conical surface about the axis of the cone moving away from the vertex of the cone continuously) is imparted to the center of rotation of the first roller R _1. Will be appreciated.

Next, FIGS. 6 to 8 show a manufacturing apparatus according to another invention of the present application, and the configuration of the molding jig 22 is different from that of the apparatus shown in FIGS. 2 to 5. . That is, the molding jig 22 is composed of a winding guide member 42 that can rotate on the inner side of the semi-finished coil spring 14 and two rollers R ₂ and R ₃ that can be driven and rotated on the outer side of the coil spring 14. The parallel winding portion 14a of the coil spring 14 can be pressed by the winding guide member 42 and the two rollers R ₂ and R ₃ . For example, in the forming jig 22 according to the second embodiment shown in FIG. 6, the winding guide member 42 forming a part of the forming jig 22 is a conical member having a conical surface formed with a spiral step portion 42a. The conical member 42 is designed to be inserted into the coil spring 14 with its conical end directed toward the first conical portion 12 side of the semi-finished coil spring 14. In this inserted state, the central axis C ₂ of the conical member 42 is parallel to the central axis C of the semi-finished coil spring 14,
In addition, they are separated by a distance α. The conical member 42 is connected to the rotary shaft 26 of the driving means 24 and imparts a rotation motion.

Further, in the forming jig 22 according to the third embodiment of FIG. 7, the winding guide member 42 is made of a cylindrical member having a required spiral groove 42b formed on the outer periphery thereof, and the cylindrical member 42 in the inserted state. The central axis C _{3 of the} is parallel to the central axis C of the semi-finished product coil spring 14 and is separated by a distance α. This cylindrical member 42 is also connected to the rotary shaft 26 of the driving means 24 and is given a rotation motion. The semi-finished product coil spring 14 is applied to the spiral groove 42b of the cylindrical member 42 and two It is pinched by rollers R ₂ and R ₃ .

Further, in the fourth embodiment of FIG. 8, the winding guide member 42 constituting the forming jig 22 is formed of a shell-shaped conical member, and the conical member 42 has a rotation center C ₄ of the semi-finished coil spring 14 Inclining with respect to the central axis C by a required angle β,
It can be inserted into the parallel winding portion 14a of the coil spring 14. The conical member 42 is also connected to the rotary shaft 26 of the driving means 24, and the second motor M ₂ imparts a rotation motion.

Next, FIGS. 9 (a) and 9 (b) show a schematic configuration of an apparatus according to another invention of the present application, in which the first clamping means is used.
20 can move horizontally between the first gripping position P ₁ and the third gripping position P _{3 on} the left side of the spring supporting means 18 in the drawing. Further, the molding jig 22 has a large diameter portion 22a and a small diameter portion 2 whose end faces are inclined at a required angle with respect to the central axis.
2b, and can be inserted into the parallel winding portion 14a of the semi-finished product coil spring 14 at its large diameter portion 22a. At this time, the molding jig 22 is inserted with its central axis C ₅ parallel to the central axis C of the semi-finished product coil spring 14 and at a distance from the required distance. Further, the molding jig 22 is provided with a second clamp means 44 as shown in the drawing, and the second clamp means 44 is provided on either the peripheral surface of the large diameter portion 22a or the peripheral surface of the small diameter portion 22b. The parallel winding portion 14a of the semi-finished product coil spring 14 can be releasably held. The forming jig 22 moves in a plane spiral (a curve generated when a point that revolves around a single point on the plane is away from the center) during its operation, and finally its central axis C ₅ Is controlled to be aligned with the central axis C of the semi-finished product coil spring 14.

Next, the operation of the manufacturing apparatus constructed as described above, particularly in the first embodiment, will be described. First, as shown in FIG. 2 (a), a semi-finished product coil spring 14 having a first conical portion 12 wound around one end thereof is placed on a spring supporting means 18 provided in the apparatus. At this time, the semi-finished product coil spring 14 is quenched in the previous step, heated to about 850 to 900 ° C., and waits for the next hot working. Further, the semi-finished product coil spring 14 is axially and circumferentially restricted in position on the spring supporting means 18 by means not shown, and in this state, the parallel winding portion 14a of the coil spring has the right end of the spring supporting means 18 in the figure. It extends horizontally to the right for the required distance from the section.

Then, the parallel winding portion 14a of the semi-finished coil spring 14 has the clamping means at the portion P _{1 where} the formation of the second conical portion should be started (this is different depending on the design specifications of the individual tall coil springs). It is strongly gripped by 20 and fixed so that it cannot move axially and circumferentially. Then the first
The forming jig 22 composed of the roller R ₁ to the third roller R ₃ passes through a required position of the parallel winding portion 14 a, that is, a position P after passing a required lead (advance for one rotation of the spiral) from a portion gripped by the clamp means 20. Clamp ₂ Specifically, the first motor M ₁ shown in FIG. 4 operates to temporarily separate the _two rollers R ₂ and R ₃ provided on the support member 32 from the first roller R ₁ so that the coil spring 14 faces each other. The two rollers R ₂ and R ₃ are interposed between the two opposing rollers, and then the two rollers R ₂ and R ₃ are moved closer to the first roller R ₁ to perform a required pinching pressure.

When the pressing force on the semi-finished product coil spring 14 by the forming jig 22 is completed, the second motor M ₂ is energized to
The rotating roller R ₁ is rotated in the winding direction of the semi-finished product coil spring 14. The third motor M ₃ ~ fifth motor M ₅ is also synchronously rotated. That is, the frame F ₁ is driven by the third motor M _3.
Starts descending at the required speed for frame F ₂ ,
The fourth motor M ₄ causes the frame F ₂ to start moving horizontally relative to the frame F _{3 in} a direction transverse to the central axis C of the semi-finished coil spring 14. The first roller by combining both movements
The plane spiral motion described above is applied to R ₁ . Furthermore, the fifth
The motor M ₅ causes the frame F ₃ to move forward in the direction of arrow A with respect to the frame F ₄ . That is, the third motor
Movement giving respectively to each member by M ₃ ~ fifth motor M ₅ are synthesized in the first roller R _1, conical spiral movement described above is applied to the first roller R _1. Thus when the first roller R ₁ performs a conical spiral movement, as shown in FIG. 2 (b) and FIG. 10, the center axis C ₁ of the first roller R ₁
Is finally controlled so as to be aligned and aligned with the central axis C of the coil spring 14.

Further, as the first roller R ₁ makes a conical spiral motion as a whole, the motor M ₁ is driven to drive the second and third rollers.
R ₂ and R ₃ move closer to the first roller R ₁ . That first roller R ₁ of the center C ₁ and the second and third roller R _2, R ₃
The distance S (θ ₀ ) from the center of the coil spring 14 gradually approaches as the conical spiral motion toward the central axis C of the coil spring 14 progresses, and S (θ ₀ )> S (θ ₁ )> S (θ ₂ ). > S
The relationship of (θ ₃ )> S (θ ₄ ) is held. As a result, at the other end of the semi-finished product coil spring 14, as shown in FIGS.
As shown in, the second conical portion 46 is roll-formed.

In this way, when the second conical portion 46 is roll-formed,
The reason why the second and third rollers R ₂ , R ₃ are moved closer to each other toward the first roller R ₁ is that the parallel winding portion in the region sandwiched by the _three roller groups R ₁ , R ₂ , R ₃ is used. This is because the curvature of 14a gradually increases with the progress of the winding molding. That is, the curvature in the region where the parallel winding portion 14a is sandwiched by the three roller groups is, for example, the state shown in FIG. 11 (a) before the start of winding, but the winding forming proceeds. As shown in FIGS. 11 (b) and 11 (c),
Its curvature gradually decreases. Therefore, at the time of roll-forming the second conical portion 46, the second and third rollers R ₂ , R ₃ are moved toward the first roller R ₁ at a required speed so that the three roller groups R ₁ , R ₂ are always , R ₃ is designed to reveal a state in which the coil wire of the parallel winding portion 14a is pinched.

(Operation of Second Embodiment) Next, the operation of the apparatus according to the second embodiment shown in FIG. 6 will be described. In this device, as described above, the conical member 42 having the spiral step portion 42a is inserted into the semi-finished product coil spring 14 such that both central axes C ₂ and C are parallel to each other. Then, the winding start portion P ₁ of the parallel winding portion 14a of the coil spring 14 is
After gripping by the clamp means 20, the clamp part
At a position P ₂ advanced by a required lead from P ₁ , the coil wire is pinched by both rollers R ₂ and R ₃ forming the molding jig 22 and the conical member 42.

At this time, the rollers R ₂ and R ₃ are elastically pressed by, for example, an appropriate compression spring (not shown), and have a force larger than the plastic deformation force applied to the coil wire at the time of roll-forming, so that the conical member 42 is always provided. It is designed to be pressed against. Also by the operation of the fifth motor M ₅ of the drive mechanism 24 described above, but the rollers R _2, R ₃ is axially movable together with the conical members 42, further the roller R _2, R ₃ is conical member For 42,
It can move in the axial direction relatively. this is,
For example, if a sixth motor is added to the support member 32 of the drive mechanism 24 shown in FIG. 4 so that both rollers R ₂ and R ₃ independently advance and retreat in the axial direction with respect to the conical member 42. Good. Therefore, when the conical member 42 is rotationally driven by the driving means 24 and moves in the direction of arrow A, the second conical member 46 is formed on the parallel winding portion 14a on the right side of the pressing portion P ₂ .

That is, as the conical member 42 performs the above-mentioned conical spiral motion and advances to the right, the coil wire is settled on the conical spiral step portion 42a, and both rollers R ₂ , R ₃ and the spiral step portion 42a It is pressed against between. Moreover, both rollers R ₂ , R ₃
Are axially movable relative to the conical member 42 as described above, these rollers R ₂ and R ₃ are conical members.
While moving along with the movement of 42 to the right, it relatively moves to the left with respect to the conical member 42. As a result, the coil wire of the parallel winding portion 14a is gradually flattened in the converging direction of the spiral step portion 42a, and finally the formation of the second conical portion 46 is completed.

(Operation of Third Embodiment) Next, the operation of the apparatus according to the third embodiment shown in FIG. 7 will be described. The operation of this device is substantially the same as that of the device according to the second embodiment described above. That is, also in this apparatus, the cylindrical member 42 having the spiral groove 42b is inserted into the semi-finished product coil spring 14 in such a relationship that both central axes C ₃ and C are parallel to each other. Then, after the winding start portion P ₁ of the parallel winding portion 14a of the coil spring 14 is gripped by the clamp means 20, the forming jig 22 is formed at the position P ₂ advanced from the clamp portion P ₁ by a required lead. Both rollers R ₂ , R ₃ and cylindrical member
42 and pinch the coil wire. Both rollers R ₂ and R ₃
Similar to the second embodiment, it is elastically pressed by an appropriate compression spring and is constantly pressed against the cylindrical member 42 with a force larger than the plastic deformation force applied to the coil wire at the time of winding forming. Both rollers R ₂ and R ₃ are axially movable together with the cylindrical member 42, but the rollers R ₂ and R ₃ are cylindrical members.
Even with respect to 42, it can move relative to the axial direction.

Then, as the cylindrical member 42 performs the above-mentioned conical spiral motion and advances to the right, the coil wire is settled in the spiral groove 42b, and a pressing force is exerted between the rollers R ₂ and R ₃ and the spiral groove 42b. Be pressed against. Moreover, since both rollers R ₂ and R ₃ are axially movable relative to the cylindrical member 42 as described above, these rollers R ₂ and R ₃ move the cylindrical member 42 to the right. While moving along with the movement, it moves relatively to the left with respect to the cylindrical member 42. As a result, the parallel winding portion 14a
The coil wire is gradually flattened into the spiral groove 42b, and finally the second conical portion 46 is formed.

(Operation of Fourth Embodiment) Next, the operation of the apparatus according to the fourth embodiment shown in FIG. 8 will be described. The operation of this device is substantially the same as that of the device according to the second embodiment described above. That is, in this device, a shell-shaped conical member 42 forming a part of the molding jig 22.
Indicates that the center of rotation C ₄ is inclined by a required angle β with respect to the central axis C of the semi-finished coil spring 14,
It is inserted in 14a. Then, after the winding start portion P ₁ of the parallel winding portion 14a is gripped by the clamp means 20, at a position P ₂ advanced by a required lead from the clamp portion P _1, both rollers forming the forming jig 22. The coil wire is sandwiched between R ₂ , R ₃ and the conical member 42.

As in the second embodiment, the rollers R ₂ and R ₃ are also elastically pressed by an appropriate compression spring and have a force larger than the plastic deformation force applied to the coil wire at the time of roll forming, and are always conical members. It is pressed against 42. Further, both rollers R ₂ and R ₃ are movable in the inclination direction together with the conical member 42, but the rollers R ₂ and R ₃ can also be moved in the axial direction relative to the conical member 42 itself. It is like this.

Then, as the conical member 42 performs the above-mentioned conical spiral motion and moves forward obliquely to the right, the coil wire of the parallel winding portion 14a moves toward the conical end of the conical member 42. Moreover, since both rollers R ₂ and R ₃ are axially movable relative to the conical member 42 as described above, these rollers R ₂ and R ₃ are not movable.
R ₂ and R ₃ move relative to the conical member 42 in the leftward direction while moving along with the movement of the conical member 42 in the diagonally forward right direction. As a result, the coil wire of the parallel winding portion 14a is gradually flattened on the conical surface of the conical member 42, and finally the second conical portion 46 is formed.

(Regarding Operation of Another Invention) Next, the operation of another invention shown in FIGS. 9 (a) to 9 (d) will be described. The parallel winding part 14a of the semi-finished product coil spring 14,
Grasped by the first clamp means 20 at the position P ₁ ,
Further, the large diameter portion 22a of the molding jig 22 is inserted into the parallel winding portion 14a. At this time, the coil wire is placed at a position P ₂ where a required lead is passed from the clamp portion P ₁ , and the second clamp means 44 makes the large diameter portion.
It is held between 22a. In this state, the required drive mechanism is urged to give the forming jig 22 a plane spiral motion toward the central axis C of the semi-finished product coil spring 14. As a result, the part of the coil wire which is respectively gripped by the first clamping means 20 and the second clamping means 44 is partially wound along a curve forming a part of a cone.

Then, the holding of the coil wire by the first clamp means 20 at the position P ₁ is once released, and the first clamp means 20 is advanced to the position P ₃ as shown in FIG. Grasp the part of the wire where the previous partial winding is completed. Further, the small diameter portion 22b of the forming jig 22 is inserted into the parallel winding portion 14a (the portion where the conical portion is not yet formed) located on the right side of this portion, and the second clamp means 44 and this small diameter portion are placed. The open end of the coil wire is gripped by 22b.
In this state, the forming jig 22 is given the same planar spiral motion as above to move the center C ₅ of the forming jig 22 toward the central axis C of the coil spring 14. Thereby, the first clamp means 20 and the second clamp means 20
The coil wires gripped by the clamping means 44 and the coil wire are respectively partially wound along a curve having a smaller diameter and forming a part of a cone (see FIG. 9 (c)). That is, as shown in FIG. 9D, a tall coil spring in which the second conical portion 46 is molded as a whole is obtained.

EFFECTS OF THE INVENTION As described above, according to the present invention, the first conical winding part is formed at one end, and the other winding parts extend in parallel with the maximum diameter. When molding the second conical portion in the turning portion, the molding start portion of the second conical portion is clamped, and the semi-finished product coil spring is clamped by the molding jig at the portion passing through the required lead from the clamp portion. By imparting a conical spiral motion to this forming jig and forcibly moving the forming jig toward the central axis of the semi-finished product coil spring, an accurate second winding having a desired pitch in the parallel winding part of the semi-finished product coil spring is obtained.
The conical portion can be shaped. Moreover, there is an advantage that highly accurate molding can be economically performed with a simple mechanism. Further, the molding jig used in the device according to the present invention is not limited to a size that can be inserted into the spring gap in the parallel winding portion, so by appropriately controlling the winding time, The number of windings of the second conical portion can be increased as desired, and it is possible to promptly meet a wide range of requests from users.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the external configuration of a tall coil spring,
2 to 5 show a preferred first embodiment of the device according to the present invention, and FIG. 2 (a) shows that a semi-finished product coil spring is placed at a fixed position on a spring supporting means, A schematic side view showing a state immediately before forming the second conical portion on the parallel winding portion, and FIG. 2 (b) is an explanation in which the semi-finished product coil spring in the state shown in FIG. 2 (a) is observed from the axial direction. Figure, Figure 3 (a)
Is an explanatory view immediately after the formation of the second conical portion on the other end of the semi-finished coil spring is finished, FIG. 3 (b) is an explanatory view of the tal shaped coil spring after the formation is observed from the axial direction, and FIG. Explanatory diagram showing an example of a schematic structure of a means for driving a molding jig,
FIG. 5 is a front view of a molding jig according to an example, FIG. 6 (a) is a schematic configuration diagram of an apparatus according to the second embodiment, and FIG. 6 (b) is an explanatory view showing movement of the molding jig. FIG. 7 is a schematic configuration diagram of an apparatus according to the third embodiment, FIG. 8 is a schematic configuration diagram of an apparatus according to the fourth embodiment, and FIGS. 9 (a) to 9 (d) are according to an apparatus according to another invention. FIG. 10 is an explanatory view showing the molding state with time, FIG. 10 is an explanatory view showing the movement trajectory of the molding jig given by the apparatus according to the first embodiment in the axial direction, and FIGS. 11 (a) to 11 (c) are It is explanatory drawing which shows the movement of the roll group which concerns on 1 Example. 12 …… First conical winding section, 14 …… Semi-finished coil spring 14a …… Parallel winding section, 18 …… Spring support means 20 …… Clamping means, 22 …… Molding jig 24 …… Conical spiral motion imparting means (driving mechanism) 42 ...... winding guide member (conical member, cylindrical member) 42a ...... spiral stepped portion, the required lead from 42b ...... spiral groove P ₁ ...... clamping portion P ₂ ...... clamping portion Passed part R ₁ ...... First roller, R ₂ ...... Second roller R ₃ ...... Third roller

Claims (5)

[Claims] 1. A semi-finished coil spring (14) in which a first conical winding part (12) is formed at one end, and the other winding parts extend in parallel with a maximum diameter. A device for manufacturing a tall coil spring by molding a second conical part (46) on a turning part (14a), comprising a pair of horizontal rollers (16, 16) arranged in parallel,
Between these rollers (16,16) the semi-finished coil spring (1
4) A spring supporting means (18) capable of supporting the spring supporting means (18), and a semi-finished coil spring (14) which is disposed on the side of the spring supporting means (18) at substantially the same level and extends from the horizontal roller (16, 16) thereof. The parallel winding part (14a) of
Clamping means (20) for releasably gripping the forming start portion (P ₁ ) of the conical portion (46) and slidably disposed on the fixed frame (F ₄ ) of the coil spring manufacturing apparatus, the spring supporting means. A semi-finished product coil spring (14) supported on (18) is moved forward and backward in a direction parallel to the central axis (C) of the semi-finished product (F ₃ ), and is slidably arranged on the forward and backward movement frame (F ₃ ). A horizontally movable frame (F ₂ ) which is driven to move back and forth substantially horizontally in a direction crossing the central axis (C) of the semi-finished coil spring (14); and a horizontally movable frame (F ₂ ) slidably disposed on the horizontally movable frame (F ₂ ). A vertically movable frame (F ₁ ) that is driven to move back and forth substantially vertically in a direction crossing the central axis (C) of the semi-finished product coil spring (14), and is rotatably and substantially pivotally supported by the vertically movable frame (F ₁ ). required from the clamp portion of the semi-finished product coil spring (14) (P ₁₎ And from the inside to the site through the lead (P ₂₎ in contact, with the first roller (R ₁₎ which is rotated in the winding direction of the semi-finished product coil spring (14), vertical lift to the lift movable frame (F ₁₎ The semi-finished product coil spring (14) comes into contact with the portion (P ₂ ) passing through the required lead from the clamp portion (P ₁ ) of the semi-finished product coil spring (14) from the outside, and between the first roller (R ₁ ). Freely rotatable second roller (R ₂ ) that clamps the semi-finished product coil spring (14)
And a third roller (R ₃ ), which holds the molding start portion (P ₁ ) of the semi-finished product coil spring (14) supported by the spring support means (18) by the clamp means (20) and A part where the 2nd roller (R ₂ ) and the 3rd roller (R ₃ ) are lowered toward the 1st roller (R ₁ ) to pass a required lead from the forming start part (P ₁ ) of the semi-finished product coil spring (14). (P ₂ ) is squeezed and the first roller (R ₁ ) is driven to rotate in the winding direction of the semi-finished product coil spring (14), while the movable frame (F ₁ ) is moved up and down.
By advancing the semi-finished product coil spring (14) substantially perpendicularly to the direction crossing the central axis (C) of the semi-finished coil spring (14), a plane spiral motion is synthetically imparted to the first roller (R ₁ ), and at the same time, the forward / backward movement frame (F ₃ ) Semi-finished coil spring (1
4) A device for manufacturing a tall coil spring, which is configured to impart a conical spiral motion to the first roller (R ₁ ) as a whole by being driven backward in a direction parallel to the central axis (C) of 4). . 2. A semi-finished coil spring (14) in which a first conical winding part (12) is formed at one end and the other winding parts extend in parallel with a maximum diameter. A device for manufacturing a tall coil spring by molding a second conical part (46) on a turning part (14a), comprising a pair of horizontal rollers (16, 16) arranged in parallel,
Between these rollers (16,16) the semi-finished coil spring (1
4) A spring supporting means (18) capable of supporting the spring supporting means (18), and a semi-finished coil spring (14) which is disposed on the side of the spring supporting means (18) at substantially the same level and extends from the horizontal roller (16, 16) thereof. The parallel winding part (14a) of
Clamping means (20) for releasably gripping the forming start portion (P ₁ ) of the conical portion (46) and slidably disposed on the fixed frame (F ₄ ) of the coil spring manufacturing apparatus, the spring supporting means. A semi-finished product coil spring (14) supported on (18) is moved forward and backward in a direction parallel to the central axis (C) of the semi-finished product (F ₃ ), and is slidably arranged on the forward and backward movement frame (F ₃ ). A horizontally movable frame (F ₂ ) which is driven to move back and forth substantially horizontally in a direction crossing the central axis (C) of the semi-finished coil spring (14); and a horizontally movable frame (F ₂ ) slidably disposed on the horizontally movable frame (F ₂ ). A vertically movable frame (F ₁ ) that is driven to move back and forth substantially vertically in a direction crossing the central axis (C) of the semi-finished product coil spring (14), and is rotatably and substantially pivotally supported by the vertically movable frame (F ₁ ). required from the clamp portion of the semi-finished product coil spring (14) (P ₁₎ From the inside to the site through the lead (P ₂₎ in contact, semi the winding guide member in the winding direction is rotation of the finished product the coil spring (14) (42), vertical lift to the lift movable frame (F ₁₎ The semi-finished product coil spring (14) comes into contact with the portion (P ₂ ) passing through the required lead from the clamp portion (P ₁ ) of the semi-finished product coil spring (14) from the outside, and between the winding guide member (42). Forming in the semi-finished product coil spring (14), which is composed of a freely rotatable second roller (R ₂ ) and a third roller (R ₃ ) that press the semi-finished product coil spring (14), and is supported by the spring support means (18). The starting portion (P ₁ ) is gripped by the clamping means (20), and the second roller (R ₂ ) and the third roller (R ₃ ) are lowered toward the winding guide member (42) to produce the semi-finished product. Required lead from the molding start part (P ₁ ) of the coil spring (14) The portion (P ₂ ) that has passed through is squeezed to rotate the winding guide member (42) in the winding direction of the semi-finished product coil spring (14) while moving the movable frame (F ₁ ) up and down the semi-finished product coil spring (14). ) By advancing in a direction substantially perpendicular to the central axis (C), a plane spiral motion is synthetically imparted to the winding guide member (42), and at the same time, the advancing / retreating frame (F ₃ ) is moved to the semi-finished coil spring ( 1
4) A device for manufacturing a tall coil spring, which is configured to impart a conical spiral motion to the winding guide member (42) as a whole by being driven backward in a direction parallel to the central axis (C). . 3. A winding guide member (42) rotatably driven inside the semi-finished product coil spring (14) comprises a conical member having a spiral step (42a) formed therein. The apparatus for manufacturing a tall coil spring according to claim _{2, wherein the} center of rotation (C ₂ ) is set parallel to the central axis (C) of the semi-finished coil spring (14). 4. A winding guide member (42), which is rotationally driven inside the semi-finished product coil spring (14), comprises a cylindrical member having a spiral groove (42b) formed therein, and the cylindrical member (42) rotates. The center (C ₃ ) is the center axis (C) of the semi-finished product coil spring (14)
The apparatus for manufacturing a tall coil spring according to claim 2, wherein the apparatus is set in parallel with. 5. A winding guide member (42) which is driven to rotate inside the semi-finished product coil spring (14) is a conical member,
The center of rotation of the conical member (42) (C ₄₎ is a semi-finished product coil spring (14) required angle inclined to have manufacturing apparatus barrel-shaped coil spring of claim 2, wherein with respect to the central axis (C) of.