JP2003290860A - Method and device for forming coil spring end - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form an end winding part converging towards the center axial line of a cylindrical winding part, in a simple structure without using a forming fixture. <P>SOLUTION: A winding means 20 arranged in a main body 18 is rotated in the forward and reverse directions by a driving motor 22. The winding means 20 is equipped with a clamp member 26 for clamping the open end 12a of the cylindrical winding part 12 in a semi-finished spring 14. In front of the main body 18, there is arranged a placing base 36 on which the semi-finished spring 14 can be horizontally placed. The placing base 36 is structured in the manner capable of moving close to or away from the winding means 20 in the axial direction of the semi-finished spring 14 and also moving vertically. Further, a conical winding part is formed by moving the placing base 36 vertically and in a receding manner while the winding means 20 is rotated, which is clamping the open end 12a of the semi-finished spring 14. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil spring end portion forming method and apparatus for forming a conical winding portion on an end portion of a coil spring.

[0002]

2. Description of the Related Art For example, a coil spring preferably used as a chassis spring for independent suspension of an automobile or the like has a cylindrical winding portion extending substantially in parallel with a required diameter at one end or both ends thereof. A conical winding portion is formed that converges in a conical shape toward the central axis of the winding portion or an axis parallel to the central axis.

As a method of forming the conical winding portion, a forming jig having a conical spiral step portion for a required number of windings is inserted into a gap in the cylindrical winding portion of the coil spring, and then the coil is wound. The conical winding portion is formed at the end of the cylindrical winding portion by forcibly winding the wire around the conical spiral step portion.

[0004]

However, in the above-described forming method, the forming jig is limited in size so that it can be inserted into the gap in the cylindrical winding portion of the coil spring, and accordingly, the conical winding portion is formed. There is a problem that the number of turns is limited. In addition, a means for moving the molding jig into and out of the gap in the cylindrical winding part is required, which complicates the structure and increases the cost, and the molding jig take-out process causes a long time required for molding. is there. Moreover, it is pointed out that molding jigs must be prepared in accordance with different specifications such as leads and pitches of the conical winding part to be molded, resulting in increased cost and complicated storage / management.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems inherent in the prior art, and has been proposed in order to solve this problem. It is an object of the present invention to provide a coil spring end forming method and apparatus capable of forming an end winding portion that converges toward a central axis or an axis parallel to the central axis with a simple configuration.

[0006]

In order to solve the above problems and achieve the intended object, a method for forming an end portion of a coil spring according to the present invention is a cylindrical winding portion extending substantially in parallel with a required diameter. In a semi-finished product spring, the end forming part of a coil spring is formed at the end part of the cylindrical winding part, the end winding part converging toward the central axis of the cylindrical winding part or an axis parallel to this. A method, wherein the open end located above the cylindrical winding portion is releasably clamped by clamping means in a state where the semi-finished product spring is mounted on a mounting table,
The position of the end portion of the semi-finished product spring to be wound is regulated in the radial direction by the first regulation device, and the axial movement of the semi-finished product spring with respect to the mounting table is regulated by the second regulation device. The clamping means or the mounting table so as to rotate and move the open end of the cylindrical winding portion inward in the radial direction toward the central axis of the semi-finished spring or an axis parallel thereto and along the central axis. Forming the end winding portion by relatively moving the first restricting means with respect to the open end along a spiral imparted to the end winding portion as Is characterized by.

In order to achieve the intended purpose, an end forming device for a coil spring according to another invention of the present application is a semi-finished product spring having a cylindrical winding portion extending substantially in parallel with a required diameter. An end forming device for a coil spring, which forms an end winding part that converges toward the central axis of the cylindrical winding part or an axis parallel to this at the end part of the cylindrical winding part. Clamping means for releasably clamping the open end of the cylindrical winding part, and a mounting table on which the semi-finished product spring is horizontally mounted and which can move close to and away from the clamping means and can be moved up and down. A first restricting means disposed on the mounting table for restricting a radial position of an end winding planned portion of the semi-finished product spring, and a second restricting means for restricting axial movement of the semi-finished product spring with respect to the mounting table. , The rotating means for forcibly rotating the clamping means in the winding direction of the semi-finished product spring, and the open end of the cylindrical winding part located on the upper side of the semi-finished product spring placed on the mounting table are clamped by the clamping means. In this state, the central axis of the cylindrical winding portion is forced along the central axis direction of the semi-finished product spring and the first moving means for forcibly raising the mounting table so as to move toward the rotation center of the clamping means. It is characterized in that it is constituted by a second moving means for forcibly moving the mounting table.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a method and apparatus for forming an end portion of a coil spring according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments.

FIG. 1 shows a schematic structure of an end forming device for a coil spring capable of carrying out the end forming method according to the present invention. The end forming device 10 extends in parallel with a required diameter. Semi-finished product spring 14 consisting of a cylindrical winding part 12
In, the end of the cylindrical winding portion 12 is provided with a winding having a gradually decreasing diameter (spiral winding), and the conical winding portion 16 (see FIG. 6) as the end winding portion is provided. It is what is molded.

A winding means 20 projecting from a front end surface of the main body 18 shown in FIG. 1 is rotatably arranged, and the winding means 20 is a first drive motor 22 arranged inside the main body.
Is configured to rotate forward and backward. The winding means 20 includes a conical winding portion 16 formed on the semi-finished product spring 14.
A guide member 24 for guiding the starting end in the winding direction of (1) and a clamp member (clamping means) 26 for cooperating with the guide member 24 and clamping the open end 12a of the semi-finished product spring 14 are provided. Further, around the outer periphery of the guide member 24, an extruding member 28 that rotates integrally with the guide member 24 and is capable of moving forward and backward in the axial direction is provided, and after the formation of the conical winding portion 16 is completed, By moving the pushing member 28 forward by an operating means (not shown), the conical winding part 16 is wound up by the winding means 20.
Configured to be spaced apart from. As shown in FIG. 3, a stopper portion 30 protruding in the radial direction is provided on the outer periphery of the guide member 24. The stopper portion 30 receives the open end portion 12a of the semi-finished product spring 14 as described later. It functions to regulate the direction. Further, the front end surface of the pushing member 28 also functions as a receiving surface of the open end 12a of the semi-finished product spring 14.

The push-out member 28 fitted on the guide member 24 has a passage 2 extending in the diametrical direction of the guide member 24.
8a is formed in the passage 28a so that the clamp member 26 can be moved along the passage 28a by a mechanism (not shown).
Is inserted through. The clamp member 26 is configured to be movable in the radial direction toward and away from the guide member 24, and clamps the open end 12a of the semi-finished product spring 14 between the clamp member 26 and the outer peripheral surface of the guide member 24 when the clamp member 26 approaches the guide member 24. To be done. In the embodiment, as shown in FIG. 3, the position facing the clamp member 26 directly above the guide member 24 is the standby position of the winding means 20, and the standby position is set according to the number of turns of the conical winding portion 16. The winding means 20 is set to rotate clockwise from the position at a predetermined angle. The rotation angle of the winding means 20 can be appropriately set and changed according to the number of turns of the conical winding portion 16 and the like.

As shown in FIG. 2, a detection cylinder 32 is disposed on one side of the main body 18, and a detection member 34 is provided at the tip of the rod of the cylinder 32 which points the winding means 20.
Is provided. The detection member 34 is located at the standby position, where the detection member 34 faces the clamp position of the open end 12a of the semi-finished product spring 14 by the clamp member 26 and the guide member 24, and the hoisting means 20. Is configured to move between the retracted position and the retracted position. Further, a detection means (not shown) is connected to the detection member 34, and the semi-finished product spring 1 is attached to the detection member 34 facing the detection position.
When the open end 12a of No. 4 contacts, the open end 12a
It is set to detect that a has reached the clamp position.

A mounting table 36 on which the semi-finished product spring 14 can be horizontally mounted is disposed in front of the main body 18. As shown in FIG. 2, a pair of parallel support rollers 38, 38 are rotatably supported on the mounting table 36 so as to be separated from each other in the left-right direction horizontally orthogonal to the central axis of the winding means 20. The support rollers 38, 38 are rotated in the same direction by a rotation motor 40 provided on the mounting table 36. Then, as will be described later, the semi-finished product spring 14 is placed on the support rollers 38, 38, and the semi-finished product spring 14 is also rotated by the rotation of the support rollers 38, 38 to move the open end 12a to the clamp position. It is configured to be positioned. Both support rollers 38, 3
In a state where the semi-finished product spring 14 is horizontally mounted on the plate 8, the semi-finished product spring 14 is positioned so that the central axis line of the winding means 20 faces the vertical line intersecting the central axis line of the cylindrical winding portion 12 of the semi-finished product spring 14. The support roller 38,
Numeral 38 is adjusted to be moved toward and away from the right and left in accordance with a change in diameter of the cylindrical winding portion 16 in the semi-finished product spring 14,
The semi-finished product spring 14 can be stably placed.

The mounting table 36 is constructed so as to be able to move up and down in a horizontal posture, and the both supporting rollers 38, 38 are moved by an elevating mechanism (not shown) using the first drive motor 22 as a drive source.
A stand-by position in which the open end 12a of the semi-finished product spring 14 placed on 38 is brought to a level at which it can be clamped by the guide member 24 and the clamp member 26;
The central axis of the semi-finished product spring 14 mounted on the shaft 38 or an arbitrary axis parallel to and separated from the central axis is the winding means 2.
It is set to move up and down between the central axis of 0 and the operating position to be matched. Also, by changing the order of the coil spring (product) to be manufactured, the cylindrical winding portion 1 in the semi-finished product spring 14 is
When the diameter of No. 2 and the axial line position that coincides with the central axial line of the winding means 20 are changed, the moving amount between the standby position and the operating position can be changed according to the diameter or the axial line position. In addition, in the embodiment, the first drive motor 22 is configured so as to serve as both a rotating means for forcibly rotating the clamp member 26 and a first moving means for forcibly raising the mounting table 36.

On the mounting table 36, both supporting rollers 38,
A first cylinder 42 is disposed upward at a position facing between 38, and a guide pin 44 is attached to a rod pointing above the cylinder 42. Then, the first cylinder 42
By the forward and reverse biasing of
Cylindrical winding part 12 of semi-finished product spring 14 mounted on
It is configured to move between a retracted position (FIG. 1) that does not contact the shaft and a guide position (FIG. 4) that contacts the axial surface of the cylindrical winding portion 12. That is, by rotating the support rollers 38, 38 with the guide pin 44 positioned at the guide position and in contact with the semi-finished product spring 14,
Since the spiral shape is a feed screw and the guide pin 44 functions as a nut, the semi-finished product spring 14 is contacted and guided by the guide pin 44 and rotates while moving in the axial direction along the lead. In addition, a guide pin 44 (first cylinder 4
2) is configured to be movable and adjustable in the approaching / separating direction with respect to the winding means 20 (the approaching / separating direction in the axial direction of the semi-finished product spring 14), and the shaft is provided along the lead attached to the cylindrical winding portion 12. Open end 12 of semi-finished spring 14 moving in the direction
It is set so that a can reach the clamp position by the clamp member 26 and the guide member 24.

The mounting table 36 is configured so as to be movable toward and away from the winding means 20 along the central axis of the semi-finished product spring 14 in a horizontal posture, and serves as the second moving means shown in FIG. A horizontal movement mechanism (not shown) using the second drive motor 23 as a drive source is configured to move between a standby position close to the hoisting means 20 and an operation position separated therefrom. That is, the semi-finished product spring 14 whose open end 12a is clamped by the clamp member 26 and the guide member 24 is separated from the winding means 20 at the time of forming the end portion, so that the pitch in the conical winding portion 16 is formed. Are set to be even. The mounting table 36
Regarding the amount of movement from the standby position to the operating position in
The conical winding portion 16 is configured to be changeable according to the number of windings and the like.

A second cylinder 46 is provided on the side of the mounting table 36.
Is disposed upward, and a regulation pin is disposed via a bracket 48 on a rod pointing upward of the cylinder 46.
(Second restricting means) 50 faces between the support rollers 38, 38 as shown in FIG. The restriction pin 50 is moved by the forward and reverse biasing of the second cylinder 46, and
8 and 38, the retracted position of the semi-finished product spring 14 that does not come into contact with the cylindrical winding portion 12 (FIG. 4), and the regulation position that comes into contact with the axial surface of the cylindrical winding portion 12 (see FIG. 5). ) Is configured to move between. The regulating pin 50 is, as shown in FIG. 6, a cylindrical winding in the vicinity of the forming start portion of the conical winding portion 16 in the semi-finished product spring 14 in which the open end 12a is clamped by the clamp member 26 and the guide member 24. With respect to the turning portion 12, it functions to contact the surface separated from the winding means 20 and regulate the movement of the semi-finished product spring 14 in the axial direction.

A third cylinder 54 is arranged via a mounting member 52 on one side of the mounting table 36 facing the opposite side of the stopper portion 30 with the clamp member 26 of the hoisting means 20 facing the standby position interposed therebetween. At the same time, a supporting member 56 is rotatably disposed on the mounting member 52. A holding roller 58 as a first restricting means is rotatably arranged at one end of the supporting member 56 that faces the winding means 20, and the rod of the third cylinder 54 is connected to the other end thereof. By urging the third cylinder 54 forward and backward, the holding roller 58 is
The semi-finished product spring 14 is configured to move between a restricting position in which the end part of the semi-finished product spring 14 is abutted on a predetermined part to be wound and restricts the position of the spring 14 in the radial direction, and a retracted position separated from the winding means 20. The holding roller 58 moves with respect to the open end 12a along the spiral imparted to the conical winding portion 16 by the vertical movement and horizontal movement of the mounting table 36, whereby the conical winding portion 16a. It functions to prevent the harmful radial deformation of 16 from occurring. The holding roller 58 is configured to be swingable with respect to the support member 56 in accordance with the lead applied to the conical winding portion 16.

[0019]

Next, the operation of the end forming apparatus according to the embodiment will be described in relation to the end forming method. The hoisting means 20 stands by at a standby position where the clamp member 26 is separated from the guide member 24, and the mounting table 36 faces the standby position in the ascending / descending direction and the approach / separate direction. There is.

In this state, as shown in FIG. 4, when the semi-finished product spring 14 composed of the cylindrical winding portion 12 extending in parallel with the required diameter is placed on the support rollers 38, 38, the detection is performed. The cylinder 32 is urged to face the detection member 34 in the retracted position to the detection position, and
The cylinder 42 is urged to move the guide pin 44 at the retracted position to the guide position. Further, when the rotation motor 40 is driven and the support rollers 38, 38 rotate in a predetermined direction (clockwise direction in FIG. 2), the semi-finished product spring 14 also rotates. At this time, when the semi-finished product spring 14 comes into contact with the guide pin 44, the spring 14 rotates while contacting the guide pin 44, whereby the spring 14 moves in the axial direction by the lead, and the open end 12a of the spring 14 is pushed out. The position comes into contact with the front surface of the member 28 and with the stopper portion 30 of the guide member 24 (see FIG. 3). At this time, the open end 12a of the semi-finished product spring 14 comes into contact with the detection member 34, whereby the detection means detects the arrival of the open end 12a at the clamp position, whereby the rotation motor 40 is stopped. The support rollers 38, 38 and the semi-finished product spring 14 also stop rotating and the positioning of the open end 12a is completed. Further, the first cylinder 42 and the detection cylinder 32 are reversely biased, and the corresponding guide pin 44 and the corresponding detection member 34 are moved to the retracted position.

Next, the clamp member 26 is guided by the guide member 2.
4, the open ends 12a of the semi-finished product springs 14 are clamped by the two members 26, 24. Further, as shown in FIG. 5, the second cylinder 46 is urged to move the restriction pin 50 from the retracted position to the operating position, and restricts the movement of the semi-finished product spring 14 on the support rollers 38, 38 in the axial direction. Further, by urging the third cylinder 54 to move the holding roller 58 from the retracted position to the restricted position, the roller 58 comes into contact with the end winding planned portion of the semi-finished product spring 14 and radially outward. Regulate the movement of.

In this state, the winding means 20 is rotationally driven in a predetermined direction (clockwise direction in FIG. 2) by the first drive motor 22, and the mounting table is set by the first drive motor 22 and the second drive motor 23. 36 moves up and moves horizontally from the standby position to the operating position. As a result, the open end portion 12a of the cylindrical winding portion 12 of the semi-finished product spring 14 is
Is forcibly rotated, and the open end 12 is moved from the position where it abuts against the regulation pin 50 when the mounting table 36 rises.
A winding motion toward the central axis of the spring 14 is applied to the cylindrical winding portion 12 up to a. At this time, no rotation is applied to the cylindrical winding portion 12 on the side opposite to the contact portion of the regulation pin 50 (the side separated from the winding means 20). As a result, a conical winding portion 16 is formed at the end of the cylindrical winding portion 12 so as to converge at a required pitch toward the central axis of the cylindrical winding portion 12. Moreover, the pitch of the conical winding part 16 becomes uniform because the mounting table 36 moves upward while moving horizontally. Further, the holding roller 58 in the regulated position is moved with respect to the open end portion 12a along the spiral imparted to the conical winding portion 16 by the upward movement and horizontal movement of the mounting table 36, thereby forming a conical shape. Winding part 1
No harmful radial deformations are generated in No. 6.

When the forming of the conical winding portion 16 is completed, the clamping by the clamping member 26 and the restriction by the holding roller 58 are released, and then the pushing member 28 is moved forward to obtain the coil spring. Is separated from the winding means 20. Also, the winding means 20
And the mounting table 36 returns to the original standby position,
The supply of the next semi-finished product spring 14 is awaited.

In the end forming apparatus 10 of the embodiment, the winding means 20 in which the open end 12a of the semi-finished product spring 14 is clamped.
Since the conical winding portion 16 can be formed on the cylindrical winding portion 12 only by rotating and rotating the placing table 36 on which the semi-finished product spring 14 is placed with respect to the winding means 20 and moving the same horizontally. The number of windings of the conical winding portion 16 is not limited due to the forming jig, and it is possible to easily meet a wide range of requests from users. Further, since no molding jig is used, the time required for molding can be shortened, and the time required for setup change when changing the order of the coil spring to be manufactured can be shortened, and the manufacturing efficiency can be improved. Moreover, it is not necessary to prepare molding jigs according to different specifications such as the lead and pitch of the conical winding part 16 to be molded, so that the cost can be kept low and storage and management are not necessary.

When various conditions such as the diameter of the semi-finished product spring 14 to be molded and the number of turns of the conical winding portion 16 are changed by changing the order, the rotation angle of the winding means 20 and the amount of elevation of the mounting table 36 are changed. The amount of horizontal movement and the like can be dealt with only by changing the setting according to the specifications, and the time required for setup change can be shortened. Further, since a forming jig is not used, it is possible to attach the open end of the conical winding portion to the inside of the coil spring or attach the lead in the opposite direction. Further, the conical winding is moved by moving the clamping means or the mounting table so that the open end of the cylindrical winding portion moves inward in the radial direction toward an arbitrary parallel axis which is separated from the central axis of the semi-finished product spring. It is possible to manufacture a coil spring in which the central axis of the winding portion on the open end side is deviated from the central axis of the cylindrical winding portion.

In the embodiment, the open end of the semi-finished product spring is moved toward the central axis of the cylindrical winding portion by raising the mounting table with respect to the winding means (clamp member). A configuration may be adopted in which the hoisting means (clamp member) is lowered with respect to the table. Further, instead of horizontally moving the mounting table in order to make the pitch of the conical winding portion uniform,
The winding means (clamp member) may be moved in the axial direction. That is, any configuration may be used as long as the winding means (clamp member) and the mounting table can be moved relative to each other.

Further, in the embodiment, the rotation of the hoisting means (clamp member), the raising and lowering and the horizontal movement of the mounting table have been described in the case where the two driving motors are used as the drive sources. The driving means for the horizontal movement is not limited to the motor, and other means such as a linear actuator such as a fluid pressure cylinder can be appropriately adopted.

[0028]

As described above, according to the method and apparatus for forming an end portion of a coil spring according to the present invention, the end winding portion is provided on the cylindrical winding portion of the semi-finished product spring without using a forming jig. Since it can be molded, the number of windings of the end winding portion is not limited due to the molding jig. That is, regarding the specifications of the end winding portion, it is possible to promptly meet a wide range of requests from users.

Further, since a molding jig is not used, the time required for molding can be shortened, and the time required for the setup change of the device due to the change of the order of the coil spring to be manufactured can be shortened, thereby improving the manufacturing efficiency. obtain. Moreover, it is not necessary to prepare molding jigs according to different specifications such as the lead and pitch of the end winding portion to be molded, the cost can be kept low, and storage / management is not necessary.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of an end forming apparatus according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional side view showing a schematic configuration of an end forming apparatus according to an embodiment.

FIG. 3 is a side view of the essential parts showing the winding means of the end forming apparatus according to the embodiment.

FIG. 4 is a schematic view showing a forming step by the end forming apparatus according to the embodiment, showing a state in which a semi-finished product spring is placed on a support roll.

FIG. 5 is a schematic view showing a forming process by the end forming apparatus according to the embodiment, showing a state in which the open end of the semi-finished product spring is clamped.

FIG. 6 is a view showing a forming step by the end forming apparatus according to the embodiment, in which the conical winding portion is formed at the end of the semi-finished product spring by rotating the winding means and moving the mounting table upward and forward. It is a schematic diagram showing a state of molding.

[Explanation of symbols]

12 Cylindrical winding part 12a open end 14 Semi-finished product spring 16 Conical winding part (end winding part) 22 First drive motor (rotating means, first moving means) 23 Second drive motor (second moving means) 26 Clamping member (clamping means) 36 table 50 Control pin (2nd control means) 58 Holding roller (first restricting means)

Claims (2)

[Claims] 1. A semi-finished product spring (14) having a cylindrical winding portion (12) extending substantially in parallel with a required diameter, wherein the cylindrical winding portion (12) has an end portion having the cylindrical winding portion (12). End winding that converges toward the central axis of the part (12) or an axis parallel to it
A method of forming an end portion of a coil spring for forming (16), wherein the semi-finished product spring (14) is placed on a placing table (36) and is positioned above the cylindrical winding portion (12). Open end (12a)
Is releasably clamped by the clamping means (26), the radial position of the end winding planned portion of the semi-finished product spring (14) is regulated by the first regulation means (58), and the semi-finished product spring (14) The clamp means (26) is rotated while the axial movement of the mounting table (36) is restricted by the second restricting means (50), and the open end (12a) of the cylindrical winding part (12) is also rotated. ) Is moved so as to move inward in the radial direction toward the central axis of the semi-finished product spring (14) or an axis parallel to the central axis, and along the central axis.
6) Or as the above-mentioned stand (36) is moved relatively,
Forming the end winding portion (16) by moving the first restricting means (58) relative to the open end portion (12a) along the spiral imparted to the end winding portion (16). A method for forming an end portion of a coil spring, comprising: 2. A semi-finished product spring (14) having a cylindrical winding portion (12) extending substantially in parallel with a required diameter, wherein the cylindrical winding portion (12) is provided at the end thereof. End winding that converges toward the central axis of the part (12) or an axis parallel to it
A coil spring end forming device for forming (16), which is a clamp means (26) for releasably clamping the open end (12a) of the cylindrical winding part (12) of the semi-finished product spring (14).
And the semi-finished product spring (14) is placed horizontally, and the clamping means
A mounting table (36) that can move close to and away from (26) and that can move up and down, and is disposed on the mounting table (36) described above, and the end winding scheduled portion of the semi-finished product spring (14) is First to regulate the position in the radial direction
A second restricting means (50) for restricting the axial movement of the restricting means (58) and the semi-finished product spring (14) with respect to the mounting table (36), and the clamping means (26) for the winding direction of the semi-finished product spring (14). The rotating means (22) for forced rotation to the above, and the open end (12a) of the cylindrical winding part (12) located on the upper side of the semi-finished product spring (14) mounted on the mounting table (36) are described above. Forcibly forcing the mounting table (36) so that the central axis of the cylindrical winding part (12) moves toward the center of rotation of the clamping means (26) while being clamped by the clamping means (26). It is characterized by comprising a first moving means (22) for raising and a second moving means (23) for forcibly moving the mounting table (36) along the central axis direction of the semi-finished product spring (14). Coil spring end forming device.