JPH0313931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a double coil torsion spring and an apparatus for manufacturing the same, for example, as shown in FIG.
The winding direction is different, which is used when the keyhole 24 of the automobile door 23 is pivoted on the shaft support 26 to prevent water such as rain from entering from inside the door 23 and the lid 25 is constantly pressed by elastic force. A double coil torsion spring 27 consisting of two concentrically formed coil parts and an intermediate locking part for utilizing the torsional resiliency of the coil parts is continuously manufactured from a long wire material. The present invention also relates to a method for manufacturing a double coil torsion spring that can be produced at high speed, and an apparatus for manufacturing the same.

(Prior Art) Conventionally, manufacturing equipment used to manufacture double coil torsion springs has a shape that consists of two concentric coil parts with different winding directions, and a torsional elastic force of the coil parts. The spring wire is cut to an expanded length, bent from the center to form a U-shape as the intermediate locking part, and then wound on the left and right sides at the same time to create a double coil. Molded torsion spring. Therefore, a special machine for manufacturing double coil torsion springs must be used for this molding, resulting in an enormous amount of equipment costs.

Therefore, an attempt has been made to manufacture a double coil spring by intermittently forming a large number of coil springs using the apparatus for manufacturing a connected coil spring proposed in Japanese Utility Model Publication No. 54-28427.

(Problem to be Solved by the Invention) However, this device has a guide groove that is located on the opposite side of the guide roller to the guide tube for the wire rod and engages with the wire rod fed out from the guide tube.
A switching guide body capable of switching and feeding the wire rod engaged with the guide groove by rotation to one side and the other side, which are the directions intersecting the direction of the wire rod fed out from the guide tube, is arranged, and the guide tube A left-hand coiling device section and a right-hand coiling device section are arranged separately on both sides of the tip, and in left-hand winding, coiling is performed on one side, and in right-hand winding, coiling is performed on the other side, so it has a guide groove. By rotating the switching guide body, the direction of the guide groove is changed to manufacture left-handed and right-handed coil springs, so the guide grooves are located on the same plane when manufacturing left-handed and right-handed coil springs. Although it is possible to intermittently mold a large number of coil springs with an appropriate number of turns, it is difficult to mold a left-handed coil spring and a right-handed coil spring concentrically. Therefore, with this device, it has been impossible to manufacture a double coil torsion spring that requires a left-handed coil spring and a right-handed coil spring arranged concentrically.
In other words, this device was simply a device for manufacturing long coil springs by preventing twisting when forming a large number of coil springs intermittently.

Therefore, the present invention was created in view of the above, and was created with the object of making it possible to manufacture coil springs using conventional coil spring manufacturing machines as they are.

(Means for Solving the Problems) The present invention has a manufacturing method including two coil portions formed concentrically with different winding directions, and a coil disposed between these coil portions to provide torsional elasticity of the coil portion. In the manufacturing method of a double coil spring, which consists of an intermediate locking part bent into a roughly U-shape to utilize force, in step (a), first, a left-handed coil spring and a right-handed coil spring are connected to each other, where the spring wire comes into contact. A winding tool having winding grooves arranged in an eight-shaped planar shape is arranged so that the fed-out spring wire comes into contact with one of the winding grooves, and By bringing the spring wire into contact with the groove, an appropriate number of turns can be wound (see Figures 2A and 2B). In the step (b), after winding, the winding tool is retreated, and the wire is is sent out to form a straight part (see Fig. 2 C), and in step (c), the inner bending tool and the outer bending tool are brought into contact with the straight part to form a substantially U-shape. An intermediate locking portion is formed by bending the coiled spring so that the end of the coiled spring and the beginning of the coiling of the next coiled spring are on the same line in the axial direction of these springs. Figure 2 D, E and F
(see), as the step (d), next, the winding tool is advanced again and the sent-out spring wire is arranged so as to come into contact with the other winding groove of the winding tool,
By bringing the spring wire into contact with this winding groove, an appropriate number of turns are wound concentrically with the winding wire in the opposite direction (see Figures 2G and 2H). The above-mentioned problem is solved by cutting the coiled spring after winding is completed from the unwound spring wire using a cutting tool (see Fig. 2 I). By bringing the spring wire into contact with the feed roll that feeds out the spring wire, the winding groove that winds the wire and forcibly adds a pitch is formed into a winding groove that is inclined at an appropriate angle with respect to the direction in which the spring wire is fed. One wire for left-handed winding and one for right-handed winding are provided on each side in a V-shape planar shape, and the fed-out spring wire is movable so as to selectively contact either one of the winding grooves, so that it can be moved for left-handed winding, and one for right-handed winding. A winding tool capable of concentrically winding both right-handed windings; an inner bending tool that abuts the spring wire to form an intermediate locking portion by bending the spring wire into a substantially U-shape; and a folding tool. It consists of a bending part consisting of an outer bending tool, and a cutting tool for cutting the completed spring from the wire rod, and the winding tool is brought into contact with the wire rod when winding the wire rod, and the intermediate locking portion The above-mentioned problem is solved by making it possible to retract and retract when forming.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

That is, 1 in the figure is a main part 1 of a coil spring manufacturing machine, and a spring wire 2 is sent out by a feed roll 4 via a wire guide 3.

Then, the fed-out spring wire 2 is wound by bringing the spring wire 2 into contact with the winding groove, and the winding groove for forcibly adding a pitch is appropriately set relative to the feeding direction of the spring wire 2. One groove for left-hand winding and one groove for right-hand winding 6 on one surface tilted at an angle.
As shown in FIGS. 2A and 2B, each winding tool 7 is brought into contact with the left-handed winding groove 5, which is one of the winding grooves in the winding tool 7, to form a left-handed coil portion 13. . Further, as shown in FIG. 3, the winding groove of the winding tool 7 has a V-shaped planar shape with a left-handed winding groove 5 and a right-handed winding groove 6, and the winding groove of the winding tool 7 has a left-handed winding groove 5 and a right-handed winding groove 6. When it comes into contact with the right-hand winding groove 5, a pitch is forcibly added following the left-hand winding groove 5, and it is wound to form a left-hand winding coil part 13, and the spring wire 2 is brought into contact with the right-hand winding groove 6. If so, a right-handed coil portion 14 is similarly formed concentrically with the left-handed coil portion 13. Further winding tool 7
is the main body of the coil spring manufacturing machine (not shown), for example,
It is attached to a coil spring manufacturing machine known from Japanese Patent Publication No. 56-12379, Utility Model Application Publication No. 54-29137, etc., and the wire rod 2 is attached to the coil spring manufacturing machine known in Japanese Patent Publication No. 56-12379, Utility Model Application Publication No. 54-29137, etc., and the wire rod 2 is placed in contact with the winding groove during winding. Position it in front of guide 3,
In addition, when forming the intermediate locking part 10 to be described later, it is provided so as to be retractable and retractable, and one of the left-hand winding groove 5 and the right-hand winding groove 6 is used as the winding groove. It is attached so that it can be moved so that it can be selected as appropriate so as to come into contact with the spring wire rod 2.

Next, the spring wire 2 that has come into contact with the left-handed winding groove 5 of the winding tool 7 and is wound with an appropriate number of turns to form the left-handed coil portion 13 is wound as shown in C, D, and E in FIG. A straight part is formed by retracting the turning tool 7, and the bending part 17, which is made up of the inner bending tool 8 and the outer bending tool 9, is brought into contact with the straight part and bent into a substantially U-shape. and the left-handed coil portion 1
The end of winding 3 and the right-handed coil part 1 that will be discussed from now on
The intermediate locking portion 10 is formed by aligning the winding beginnings of the springs 4 and 4 on the same line in the axial direction of these springs.
That is, the inner bending tool 8 and the outer bending tool 9 are used when forming the intermediate locking part 10.
is brought into contact with the spring wire 2 by a cam (not shown) or the like. The shape of the abutting part is as shown in FIGS. 4 and 2, D and E. When bending the intermediate locking portion 10 into a substantially U-shape, taking into account the back, the bending angle should be slightly more obtuse than a right angle with respect to the surface 18 that is in contact with the spring wire 2. The shape has a bending surface 20 that can be bent. Moreover, the base 19 of the contact portion 12 is connected to the intermediate locking portion 10.
The left-handed coil portion 13 is shaped to have a relief so that it does not get caught during formation. On the other hand, the outer bending tool 9 has a shape in which a contact protrusion 11 is provided on the side of the tip, and the surface 18 of the inner bending tool 8 that is brought into contact with the spring wire 2 is brought into contact with the spring wire 2. When brought into contact with each other, the opposite surface 21 of the abutment protrusion 11 on the outer bending tool 9 is formed into a shape that swells slightly in the shape of a mountain from approximately the middle portion of the outer bending tool 9 in the axial direction, and the opposite surface 21 The roller 22 is brought into contact with the outer bending tool 9, and the roller 22 presses the contact protrusion 11 more strongly during the latter half of the operation of the outer bending tool 9.
is brought into contact with the bending surface 20 and the outside bending tool 9 is actuated to follow the bending surface 20. By repeating this operation twice, the bending tool 9 is made into a substantially U-shape and the left-handed coil portion 13 is wound. End and right-handed coil part 1
An intermediate locking portion 10 is formed so that the winding start of No. 4 is on the same line in the axial direction of these coil portions.

Therefore, as shown in F, G, and H in Figure 2,
After forming the left-handed coil portion 13 and the intermediate locking portion 10, the winding tool 7 is positioned in front of the wire guide 3 so as to come into contact with the spring wire 2 again, and the other winding groove of the winding tool 7 is The spring wire 2 is brought into contact with the right-handed winding groove 6. Moreover, the right-handed coil portion 14 formed by winding the spring wire 2 an appropriate number of times is formed so as to be positioned concentrically and symmetrically with the left-handed coil portion 13 with the intermediate locking portion 10 as a boundary. . Finally, as shown in Fig. 2, cut the spring with the cutting tool 1.
5 from the spring wire 2.

In each of the above-mentioned steps, the spring wire 2 is sent out from the wire guide 3 by the feed roll 4.
may be fed out continuously, or may be fed out intermittently by controlling and driving the feed roll 4 by a servo motor (not shown) or the like.
Additionally, as shown in Figure 1, by numerically controlling the entry and exit of the tools 7, 8, 9, and 15 using a computer, etc., it is possible to automate the process as a series, resulting in even faster processing. The production of double coil torsion springs 27 can be carried out continuously. On the other hand, there are four types of tools used in the above-mentioned embodiment, and if each tool is arranged in the same way, it is actually possible to set up about eight types of tools, and therefore, it is possible to set the tools to be operated in a manner different from that described above. By attaching an additional tool (not shown), a double coil torsion spring 27 in which the intermediate locking portion 10 has a different U-shape can also be manufactured with the same set.

Double coil torsion spring 2 formed in this way
7, for example, as shown in FIG. 5, a keyhole 24 of a car door 23 is pivoted on a shaft support 26 to prevent rain or other water from entering from inside the door 23, and the lid is constantly repelled. When pressing the lid 25, the open ends of each end are locked to the door 23, and the lid 25 is pressed by the torsional elastic force of the coil part by the intermediate locking part.

(Effects of the invention) Therefore, compared to the conventional manufacturing of double coil torsion springs, it is possible to feed out the long wire as it is without cutting the spring wire 2 to the developed length of the double coil torsion spring. Because it can be manufactured,
Without using a dedicated double coil torsion spring manufacturing machine, it can be easily produced by simply modifying a conventional coil spring manufacturing machine, and the above-mentioned parts 16, 17, feed roll 4, and cutting tool can be easily manufactured. If steps 15 and the like are numerically controlled by various computers and automated as a series of continuous steps, the double coil torsion spring 27 can be manufactured continuously at high speed.

That is, by bringing the spring wire material 2 into contact with the feed roll 4 that feeds out the spring wire material 2, a winding groove that winds the wire material 2 and forcibly adds a pitch is created. One wire for left-handed winding and one for right-handed winding are provided in a V-shaped planar shape on one surface inclined at an appropriate angle with respect to the direction, and the sent-out spring wire 2 is selectively placed in either one of the winding grooves. Since a winding tool 7 is provided which is movable so as to make contact so as to be able to wind both left-handed and right-handed winding concentrically, the spring wire 2 can be wound in the winding groove 5 for left-handed winding and right-handed winding. By selectively contacting one of the coil springs 6, coil springs with different winding directions can be manufactured concentrically and continuously as appropriate.

Furthermore, a bending section is provided, which includes an inner bending tool 8 and an outer bending tool 9, which abut the spring wire 2 to form an intermediate locking section 10 by bending the spring wire 2 into a substantially U-shape. and a cutting tool 15 for cutting the completed spring from the wire rod 2, so that when concentrically and continuously manufacturing coil springs with different winding directions, left-handed coil springs and right-handed coil springs can be separated. The intermediate locking part 10 can be formed between the spring wire 2 and the coil spring by bending the spring wire 2 into a substantially U-shape using the bending part, and the spring wire 2 can be automatically folded at the completion stage. It can be cut and completed.

Therefore, if steps (a), (b), (c), (d), and (e) are sequentially performed as a manufacturing method for a double coil torsion spring,
It is possible to manufacture the double coil torsion spring 27 in a continuous process, which was impossible with the conventional connected coil spring manufacturing apparatus described above. Therefore, it is possible to simplify the mechanism and reduce equipment costs associated with it. Moreover, even when forming the intermediate locking part 10, there is no waste in the process, making it very suitable for mass production. In addition, various tools can be added, so it can be used for high-variety, low-volume production. is also suitable.

Also, the length of each coil spring and the intermediate locking portion 10
Even if the shape, etc. of
It is possible to easily manufacture the double coil torsion spring 27 with the required dimensions without any shortage or surplus.

As explained above, the present invention provides a double coil torsion spring having two concentric coil parts with different winding directions and an intermediate locking part for utilizing the torsional elastic force of the coil parts. It enables continuous and high-speed production from long wire materials, and can also be used to manufacture coil springs as conventional equipment, reducing equipment costs, and further shortening processing steps and material collection. This has excellent effects such as being able to eliminate waste.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic perspective view of the main parts, FIG. 2 is a manufacturing process diagram shown in a plan view and a side view, and FIG. 3 is a perspective view of a winding tool.
FIG. 4 is a perspective view of the inner and outer bending tools, and FIG. 5 is a perspective view of the main parts showing the state in which the double coil torsion spring is used. 1...Main parts of coil spring manufacturing machine, 2...Wire rod for spring, 3...Wire guide, 4...Feed roll, 5...
...Groove for left-handed winding, 6... Groove for right-hand winding, 7... Winding tool, 8... Inner tool for bending, 9... Outer tool for bending, 10... Intermediate locking part, 11... Contact projection, 12... Contact portion, 13... Left-handed coil part, 14... Right-handed coil part, 15... Cutting tool, 16... Winding part, 17... Bending part, 18...
Surface, 19... Base, 20... Bent surface, 21... Opposite surface, 22... Roller, 23... Door, 24...
...keyhole, 25...lid, 26...shaft support, 27...
Double coil torsion spring.

Claims (1)

[Claims] 1. Two coil parts 13 and 14 formed concentrically with different winding directions, and these coil parts 1
In the method for manufacturing a double coil spring, the intermediate locking portion 10 is arranged between the coil portions 13 and 14 and is bent into a substantially U-shape to utilize the torsional elastic force of the coil portions 13 and 14. ) First, the sent-out spring wire 2 is passed through a winding tool 7 in which left-handed winding grooves and right-handed winding grooves 5 and 6 are arranged in a figure-eight planar shape, with which the spring wire 2 comes into contact. The spring wire material 7 is arranged so as to be in contact with one of the winding grooves 5 and 6, and the spring wire material 7 is brought into contact with this winding groove 5, thereby winding the wire material with an appropriate number of turns. After winding, the winding tool 7 is retreated and the wire 2 is sent out to form a straight section; (c) Then, the inner bending tool 8 and the outer bending tool 9 are brought into contact with the straight section; The coil spring is bent into a substantially U-shape, and the end of the wound coil spring and the beginning of the coil spring to be wound next are on the same line in the axial direction of these springs, and the intermediate locking is performed. (d) Next, the winding tool 7 is advanced again and the sent-out spring wire 2 is arranged so as to come into contact with the other winding groove 6 of the winding tool 7. By bringing the spring wire 7 into contact with the winding groove 6, an appropriate number of turns are wound in a reverse and concentric manner with the wound spring wire 2. A method for producing a double coil torsion spring characterized by cutting an unwound spring wire 2 by a method 15. 2 By bringing the spring wire material 2 into contact with the feed roll 4 that sends out the spring wire material 2, the winding grooves 5 and 6 that wind the wire material 2 and forcibly add a pitch are formed in the spring wire material 2. One wire for left-handed winding and one for right-handed winding are provided in a V-shaped planar shape on one surface inclined at an appropriate angle with respect to the feeding direction, and the fed spring wire 2 is placed in one of the winding grooves 5 and 6. A winding tool 7 is movable so as to selectively abut on one side and can be wound concentrically on both the left and right windings; It consists of a bending part consisting of an inner bending tool 8 and an outer bending tool 9 that come into contact with the wire 2 to form a stop part, and a cutting tool 15 that cuts the completed spring from the wire 2, A double coil torsion spring characterized in that the winding tool 7 is made to come into and out so as to be in contact with the wire rod 2 when winding the wire rod 2 and to be retracted when forming the intermediate locking part. manufacturing equipment.