JP5976205B2 - Cushion spring manufacturing method and cushion spring - Google Patents

Description

  The present invention relates to a method for manufacturing a cushion spring made of a spring wire supported by a seat frame or a backrest frame in an automobile seat, and a cushion spring that can be preferably manufactured by this manufacturing method.

  In order to enhance cushioning, the seat surface and backrest of automobile seats contain a cushioning material made of urethane foam or other material in the form of a panel, and below it is a straight spring wire. A planar cushion spring (see, for example, Patent Documents 1 and 2) in which a plurality of spring materials in which a plurality of Z-shaped bent portions are repeatedly formed is connected is provided. With this cushion spring, it becomes possible to support the cushion material with an appropriate elastic force, and it is possible to prevent the sinking of the cushion material and provide a good sitting comfort.

  However, in the conventional method of manufacturing a cushion spring, the spring wire is fed one by one at a bending angle (overbend angle) with a large bending angle (overbend angle) in consideration of the springback amount (angle). The spring material was molded while removing the influence. For this reason, at the time of the bending, the spring wire rod on the tip side from the currently bent portion is largely swung to the left and right around the bent portion. Therefore, it is difficult to reduce the size of the bending apparatus.

  In addition, in recent years, in order to improve the sitting comfort of the seat, the spring characteristics of the cushion spring are changed depending on the location. In this case, it was necessary to change the bending radius of the spring wire depending on the location. For this reason, the setup time is increased by switching the dies according to different bending radii, the processing speed is reduced, and another bending device needs to be prepared.

JP 2009-172025 A JP 2010-259665A

  The present invention has been made to solve the above-mentioned problems, and when bending the spring wire forming the spring material of the cushion spring, the bending is performed so that the tip side of the spring wire is not swung left and right. It is an object of the present invention to provide a method of manufacturing a cushion spring that can increase the processing speed, reduce the size of a bending device, and perform bending with high accuracy. It is also an object of the present invention to provide a cushion spring that can be suitably manufactured by this manufacturing method and whose spring characteristics can be easily changed depending on the location.

The above issues
A bending step of forming a spring material by sequentially connecting a plurality of Z-shaped bent portions having a left bent portion and a right bent portion to a linear spring wire;
A method of manufacturing a cushion spring that undergoes a connecting step of connecting a plurality of spring materials to form a planar cushion spring,
In the bending process, by bending the left bent portion and the right bent portion at the same time for each Z-shaped bent portion, a spring wire positioned outside the left bent portion and a spring wire positioned outside the right bent portion This is solved by providing a method of manufacturing a cushion spring characterized in that the parallel positional relationship is maintained at the time of bending.

  Here, the “Z-shaped bent portion” is composed of “two bent portions (left bent portion and right bent portion) bent in opposite directions and a pair of substantially parallel rods on both sides thereof. It means "part", and the bending angle of the two bent portions is not limited to an acute angle. Further, the form of the pair of rod-shaped portions is not limited to a straight line shape, but also includes an arc shape.

  In the cushion spring manufacturing method of the present invention, in the bending step, the respective Z-shaped bent portions are formed so that the bending radii of the left bent portion and the right bent portion are equal for each Z-shaped bent portion. It is preferable. In the bending step, it is also preferable to form a plurality of Z-shaped bent portions from both ends of one linear spring wire toward the center.

  In addition, the above-described problem is a cushion spring that is formed into a planar shape by connecting a plurality of spring materials formed by sequentially connecting a plurality of Z-shaped bent portions having a left curved portion and a right curved portion to a linear spring wire. The left and right bent portions have the same bending radius for each Z-shaped bent portion, while the shape of one Z-shaped bent portion and the other Z-shaped bent portion is different. This can also be solved by providing a cushion spring characterized in that the spring characteristics are different depending on the type.

  As described above, according to the present invention, when the spring wire forming the spring material of the cushion spring is bent, the tip end side of the spring wire is not swung left and right to prevent deformation and increase the bending speed. It is possible to provide a method for manufacturing a cushion spring that can reduce the size of the folding device. In addition, it is possible to provide a cushion spring that can be suitably manufactured by this manufacturing method and whose spring characteristics can be easily changed depending on the location.

It is the top view which showed an example of the cushion spring which concerns on this invention. It is sectional drawing which showed the state which cut | disconnected the state which has formed the Z-shaped bending part in the spring wire with the manufacturing method of the cushion spring which concerns on this invention in the horizontal surface containing the centerline of a spring wire. It is the top view which showed a mode that several Z type bending part was formed toward the center from the both ends of a spring wire with the manufacturing method of the cushion spring which concerns on this invention. It is the top view which showed the other example of the cushion spring which concerns on this invention. It is the top view which showed another example of the cushion spring which concerns on this invention.

Hereinafter, preferred embodiments of the cushion spring and the manufacturing method thereof according to the present invention will be described more specifically with reference to the drawings. FIG. 1 is a plan view showing an example of a cushion spring 1 according to the present invention. The cushion spring 1 shown in FIG. 1 is formed by connecting four spring materials 11 (more precisely, two sets of two sets) to form a plane, and its front end and rear end Is mounted on the seating surface of the seat by being hooked on the seat plate frame 100 and fixed. The cushion spring 1 includes a straight spring wire 10, a left curved portion A ₁ (a portion indicated by hatching on the lower side in the enlarged frame in FIG. 1) and a right curved portion A ₂ (in the enlarged frame in FIG. 1). In this example, a bending process is performed by forming a plurality of Z-shaped bent portions A having a portion having a hatched area on the upper side in order to form a spring material 11 and a surface by connecting the plurality of spring materials 11 together. It is manufactured by passing through a connecting step to form a cushion spring 1 having a shape.

Folding step, as shown in FIG. 2, is performed by folding the same time the left curved portion A ₁ and the right curved portion A ₂ for each Z-shaped bent portion A. FIG. 2 is a cross-sectional view showing a state in which the Z-shaped bent portion A is formed in the spring wire 10 by the method for manufacturing the cushion spring 1 according to the present invention, cut along a horizontal plane including the center line of the spring wire 10. FIG. Thus, when each Z-shaped bent portion A is formed, the left bent portion A ₁ and the right bent portion A ₂ are bent at the same time, whereby the left bent portion A ₁ and the right bent portion A ₂ are bent. At this time, the rod-like portion A ₃ located outside the left curved portion A _{1 in} the spring wire 10 and the rod-like portion A ₄ located outside the right curved portion A ₂ in the spring wire 10 are maintained in a parallel positional relationship. It is possible to do. That is, it is the tip side spring wire 10 than locations folded, as indicated by the arrow V ₅ in FIG. 2, only translating the slight width diagonally, to form a Z-shaped bent portion A Is possible. For this reason, not only is the product accuracy improved by suppressing the deformation of the spring wire 10 where the Z-shaped bent portion has already been formed, but also the speed of the bending process is increased, and the bending device such as the NC bender is miniaturized. It is also possible to reduce the number of production lines.

In the example shown in FIG. 2, the left bent portion A ₁ and the right bent portion A ₂ are bent at the same time by the positioning pin 51 and the positioning pin 52, and the right bending center pin 53 (fixed die) and the right bending portion. The right turning pin 55 (turning die) and the left turning center pin 56 (fixed) with respect to the distal end side of the spring wire 10 that is positioned with a predetermined portion held between the fixing pin 54 (clamp). Die), left turn turning pin 57 (turning die), and left turn fixed piece 58 (clamp) from the position shown in FIG. 2A to the position shown in FIG. 2B, respectively. It is done by moving. That is, the right turn pin 55 (turning die), the left turn center pin 56 (fixed die), and the left turn pin 57 (turning die) are the right turn center pin 53 (fixed die). Rotating and moving in the directions of arrows V ₁ , V ₂ , and V ₃ , respectively, with the center line L ₁ as the center of rotation, and the left curved fixed piece 58 (clamp) is translated in the direction of the arrow V ₄ ing. These operations are performed in conjunction with each other by incorporating a parallel movement mechanism such as a parallel link. These die members 51 to 58 are in a state of being refrained from the front side or the back side in FIG. (Hereinafter, description of parentheses on the die member is omitted.)

Here, the right music for the central pin 53 is a die member folding for regulating the bending radius r ₂ of the right curved portion A _{2 (Fig.} 2) abuts from the inside to the right curved portion A _2. The right song fixing pin 54, when bending the right curved portion A _2, the rod-shaped portion A ₄ abuts from the outside to the rod portion A ₄ is a die member for preventing spread outward. Furthermore, the right music for the pivot pin 55, when bending the right curved portion A _2, a die member for bending and rotational movement while being in contact with the outer right curved portion A _2. On the other hand, the left tracks for the central pin 56 is a die member for restricting the bending radius r ₁ of the left curved portion A ₁ from the inside to the left curved portion A ₁ in contact _(Fig. 2). Further, the left music for the pivot pin 57, when folding the left curved portion A _1, a die member for bending and rotational movement while being in contact with the outside on the left curved portion A _1. Further, the fixing piece 58 for the left song, when bending the left curved portion A _1, the rod-shaped portion A ₃ abuts from the outside to the rod portion A ₃ is a die member for preventing spread outward.

Incidentally, at the time of folding of the left curved portion A ₁ and the right curved portion A _2, to the rod portion A ₃ and the rod section A ₄ is to keep the parallel positional relationship, each Z-shaped bent portion A in, formed between the bending angle (rod portion a ₃ and the bar portion a ₅ is angle formed) and the bending angle of the right curved portion a ₂ (rod portion a ₄ and the rod portion a ₅ of the left curved portion a ₁ angle ) and well if so as to coincide, it is not necessary to match the bending radius r ₁ of the left curved portion a _{1 (FIG.} 2) and the right curved portion a ₂ of the bending radius r _{2 (Figure} 2) I think. However, by setting the bending radius r ₁ and the bending radius r ₂ equal for each Z-shaped bending portion A, the amount of spring back at the bending portion A ₁ and the spring at the bending portion A ₂ are set. The back amount becomes equal. Therefore, adjustment of the folding angle corresponding to the amount of spring back of the left curved portion A ₁ and the right curved portion A ₂ can be at the same time, it is possible to improve the accuracy of shortening the bending angle of the setup time. The bending radius r ₁ and the bending radius r ₂ may be made to coincide with each other for each Z-shaped bent portion A, and between one Z-shaped bent portion A and another Z-shaped bent portion A. Then there is no need to match. From this, it is possible to freely select one Z-shaped bent portion A and other Z-shaped bent portions A, and the spring characteristics of the cushion spring 1 can be freely set for each place.

Hereinafter, by sequentially performing the folding operation of the Z-shaped bent portions A, continuous multiple Z-shaped bent portion A of the straight spring wire 10 having a Hidarikyoku portion A ₁ and the right curved portion A ₂ A spring material 11 is formed. The die members 51 to 58 may be shared when forming different Z-shaped bent portions A. However, when the shape of the Z-shaped bent portion A is changed for each Z-shaped bent portion A and the spring characteristics of the cushion spring 1 are changed depending on the location, the arrangement and the shape of the bent die members 51 to 58 are changed. These differ depending on the Z-shaped bent part A to be processed. For this reason, in the folding device (machine), the die members 51 to 58 include different folding dies for each Z-shaped folding part A.

  In the bending step, the spring material 11 may be formed by performing the bending step while intermittently feeding the spring wire 10 from one end side to the other end side. However, as shown in FIGS. 3A to 3I, it is preferable to form a pair of Z-shaped bent portions A in order from both ends of one spring wire 10 toward the center. As a result, when determining the position of the next Z-shaped bent portion A, the length of the unprocessed central straight portion is measured, so that positioning with high accuracy can be performed and the dimensional accuracy of the spring material 11 can be improved. become. FIG. 3 is a plan view showing how a plurality of Z-shaped bent portions A are formed from both ends of the spring wire 10 toward the center. Here, in FIG. 3I, one spring wire 10 having a plurality of Z-shaped bent portions A formed on both sides thereof is folded back 180 degrees at the center to form a set of two spring members 11. Yes. This folding is incorporated into a folding apparatus (machine) as a final process.

  This makes it possible to halve the time required for processing one spring material 11 as compared to the case where one Z-shaped bent portion A is formed on each spring wire 10 one by one. In addition, if the bending dies are arranged in the order indicated by the thick arrows in FIG. 3 and an intermittent feeding device (feeding device (not shown) that performs parallel movement) of the spring wire 10 is prepared, FIG. Forming in the order shown in (i) becomes possible by simultaneous operation of one process of one machine. That is, when the processing of FIG. 3 (i) is performed on a certain spring wire 10, the other seven spring wires 10 are applied to FIGS. 3 (h), (g), (f), (e), ( It becomes possible to perform the processing of d), (c), and (b) simultaneously, and the productivity of the spring material 11 is dramatically increased. Specifically, if it takes 5 seconds to process each of FIGS. 3B to 3I, one spring material 11 can be completed every time (5 seconds) required for one process. It becomes possible. In this case, the intermittent feed may be a three-dimensional transfer feed. However, if the folding die is protruded from the table only at the time of folding, a simple one-way intermittent feed can be selected while feeding the center of the spring wire 10. Possible and reasonable.

Although the manufacturing method demonstrated above is what was excellent in productivity, not only that but provision of the cushion spring 1 excellent in cushion performance is enabled. That is, in the seat cushion, it is preferable to set the amount of sinking and the hardness in the front-rear direction and the left-right direction as viewed from the center. In the present invention, this is very easy. Specifically, each form of one Z-shaped folded part A and another Z-shaped folded part A (folded radii r ₁ , r ₂ , left curved part A ₁ or right curved part A ₂ is folded. By setting the bending angle and the lengths of the rod-like portions A ₃ , A ₄ , A ₅ , etc.), different characteristics can be set according to the location. For example, in the cushion spring 1 shown in FIG. 1, the second spring material 11 and the third spring material 11 from the left side have the same form in all the Z-shaped bent portions A, but the leftmost spring material 11 The material 11 and the rightmost spring material 11 change the form of the Z-shaped bent portion A depending on the location. Thereby, the seating comfort of a seat can be improved.

  FIG. 4 is a plan view showing another example of the cushion spring 1 according to the present invention. FIG. 5 is a plan view showing still another example of the cushion spring 1 according to the present invention. In the examples shown in FIGS. 4 and 5, the shape of the Z-shaped bent portion is changed depending on the location in all the spring materials 11. Further, in the example of FIG. 5, each spring material 11 is connected by a plurality of connecting members 20 made of synthetic resin. The connecting member 20 is provided with an attachment hole 21 for attaching a seating sensor or the like. In the cushion spring 1 according to the present invention, since it is easy to change the form of the Z-shaped bent portion depending on the location, it is easy to set the location where the attachment hole 21 is provided.

  Although the use of the cushion spring 1 according to the present invention is not limited, the cushion spring 1 is particularly preferably used as a cushion spring for supporting a cushion material accommodated in a seat surface or a backrest of an automobile seat. it can.

DESCRIPTION OF SYMBOLS 1 Cushion spring 10 Spring wire 11 Spring material 20 Connecting member 21 Mounting hole 51 Positioning pin 52 Positioning pin 53 Center pin for right bending (fixing die)
54 Fixing pin for right turn (clamp)
55 Right turn pivot pin (rotation die)
56 Left turn center pin (fixed die)
57 Turning pin for turning left (turning die)
58 Fixed piece for left turn (clamp)
DESCRIPTION OF SYMBOLS 100 Seat plate frame A Z-shaped bending part A ₁ Left-curved part A ₂ Right-curved part A ₃ Rod-shaped part located in the outer side of the left-curved part in ₃ spring wire A ₄ Rod-shaped part located in the outer side of the right-curved part in ₄ spring wire A ₅ Bar-shaped part located between left and right curved parts L ₁ Center line of right curved center pin V ₁ Direction of rotation of right turning pin V ₂ Left curved center pin is rotated and moved orientation direction V ₃ pivot pin for the left track to be the front end side is translated than locations pivot pin orientation V ₄ left tracks the rotating movement is bent in the direction V ₅ spring wire moves parallel

Claims (3)

A bending step of forming a spring material by sequentially connecting a plurality of Z-shaped bent portions having a left bent portion and a right bent portion to a linear spring wire;
A method of manufacturing a cushion spring that undergoes a connecting step of connecting a plurality of spring materials to form a planar cushion spring,
In the bending process, by bending the left bent portion and the right bent portion at the same time for each Z-shaped bent portion, a rod-like portion continuous to one end in the longitudinal direction of the left bent portion in the spring wire, and a right bent portion in the spring wire and the rod portion continuous to the other end side in the longitudinal direction of the section is, as well as to keep the parallel positional relationship via the at folding of the Z-type folding unit,
The left curve
A center pin for the left turn for inscribed in the portion forming the left turn portion in the spring wire to regulate the bending radius of the left turn portion;
A left-curved fixed piece for circumscribing the rod-shaped portion continuous to one end side in the longitudinal direction of the portion forming the left-curved portion in the spring wire, so that the rod-shaped portion does not spread outward;
A left turn pin for rotating while circumscribing a portion forming the left turn portion in the spring wire; and
Formed with
The right part
A center pin for a right turn for inscribing a portion that forms the right turn portion with respect to the spring wire and restricting the bending radius of the right turn portion;
A right-turn fixing pin for circumscribing the rod-shaped portion continuous to the other end in the longitudinal direction of the portion forming the right-curved portion in the spring wire so that the rod-shaped portion does not spread outward;
A right-turning rotation pin for rotating and moving while circumscribing a portion forming the right-turned portion in the spring wire,
A method of manufacturing a cushion spring, characterized by comprising:   The method of manufacturing a cushion spring according to claim 1, wherein in the bending step, each Z-shaped bent portion is formed so that the bending radii of the left bent portion and the right bent portion are equal for each Z-shaped bent portion. . In the bending step, Z-shaped bent portions are successively formed at N locations (N is an integer of 2 or more) from both ends of one linear spring wire toward the center,
The N-shaped bent die members are arranged in the order of forming, and the Z-shaped bent portions at N places are processed simultaneously in one stroke of a single machine equipped with an intermittent feeding device for spring wire. 2. A method for producing a cushion spring according to 2.

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