JP4446380B2 - Metal bag manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a metal bag having a thin and compact shape.

  Vehicles are equipped with steering wheels, dashboards, and the like that protect the occupant from the impact generated during the collision. This type of airbag is generally made of cloth, and starts to contract almost immediately after inflating instantaneously and serving as a soft cushion.

  By the way, although the occupant can be protected from an impact by the airbag at the time of a vehicle collision, the occupant wearing the waist belt moves forward due to inertia and slides under the waist belt at the time of the collision. This phenomenon occurs.

  Therefore, in order to prevent the occurrence of the above phenomenon, various safety devices have been proposed in which a plastically deformable metal bag is contained in the seat in a contracted state, and the metal bag is inflated in the event of a collision to prevent the passenger from moving forward. (For example, see Patent Documents 1 to 4). In addition, since the metal bag is excellent in energy absorption performance, it is also used for other purposes such as protection of passengers and pedestrians at the time of collision and reduction of vehicle damage.

Japanese National Patent Publication No. 10-512210 JP 2004-001691 A Special table 2003-517966 gazette JP-T-2004-500204 gazette

  By the way, a conventional metal bag is formed by forming a plurality of corrugated bent portions on one or both of two metal plates by, for example, drawing and joining the peripheral portions of both metal plates by welding or the like. Therefore, there was a problem that the volume at the time of installation before expansion becomes relatively large, the installation space becomes large, and a large expansion allowance cannot be secured.

  The present invention has been made in view of the above problems, and the object of the present invention is to manufacture a metal bag capable of reducing installation space and securing a large expansion allowance by forming a thin and compact shape. It is to provide a method that can do this.

In order to achieve the above object, the invention according to claim 1
1) A cylindrical main body member formed into a shape in which the left and right side surface portions of the cylindrical shape have concave and convex folded portions ;
A member that closes the opening of the main body member, and the left and right side end surfaces are formed in accordance with the shape of the left and right side surface portions of the main body member, and are arranged in parallel in the vertical direction on a plane portion surrounded by four rounds. A fold shape formed by a plurality of broken lines and a plurality of broken lines obliquely intersecting these broken lines, a side member provided with R at the top of each broken line ;
A single product molding process in which each is formed into a semi-deployed shape by press molding of a metal plate,
2) A joining step of joining the side member to the peripheral edge of the opening of the main body member formed by the single product forming step to obtain a semi-deployed metal bag;
3) A crushing step of crushing a semi-deployed shape metal bag obtained by the joining step into a folded shape by pressing .
It is characterized by obtaining the metal bag of the shape folded through.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the number of steps of the folding portion is set in accordance with the developed height of the folded metal bag.

  According to the invention of claim 1, in order to finish the metal bag once formed into a semi-deployed shape by crushing it with a press or the like and folding it into a folded shape, the metal bag as a final product becomes thin and compact, The installation space can be small, and a large expansion allowance can be secured to perform the intended function.

Further , when a metal bag once formed into a semi-deployed shape is crushed in the crushing process, the side members are folded in an orderly manner with a small crushing force along the fold line formed on the metal bag. In other words, the side member is not damaged. As a result, when the metal bag is inflated (deployed), the metal bag does not crack or perforate, or the metal bag bursts, and the metal bag exhibits impermeableness and expands. The shape of the time can be maintained and the desired function can be sufficiently performed. In addition, since the deformation resistance due to wrinkle overlap is suppressed to a small level when the metal bag is deployed (inflated), the metal bag is deployed (inflated) with a small pressure (internal pressure), and the deployment (inflation) speed is increased. Enhanced. Furthermore, since the damage which generate | occur | produces in a side member is small, even if it is a high height semi-deployment-shaped metal bag, this can be folded compactly in multiple steps.

In addition , since R is provided at the top of the fold line of the crease shape formed on the side member, the crease shape can absorb the deviation due to the difference in shape between the molding of the side member and the expansion by R at the top of the fold line, Unreasonable deformation of the side member is prevented.

Furthermore , since the main body member is folded in an orderly manner along the folding portion provided on the main body member, wrinkles are not overlapped on the main body member, and no portion of the main body member is damaged. As a result, when the metal bag is inflated (deployed), the metal bag does not crack or perforate, or the metal bag bursts, and the metal bag exhibits impermeableness and expands. The shape of the time can be maintained and the desired function can be sufficiently performed.

According to invention of Claim 2, the number of steps of the folding part provided in the main body member is set according to the developed height (height during inflation) of the metal bag (for example, the higher the developed height of the metal bag, By increasing the number of folding sections, any metal bag having a low to high height when inflated can be manufactured according to its application.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The metal bag manufacturing method according to the present invention is a method of manufacturing a folded metal bag through 1) a single product forming step, 2) a joining step, and 3) a crushing step. explain.

1) Single item molding process:
In the single-piece forming step, a thin metal plate such as an iron plate or an aluminum plate is press-formed to form a cylindrical main body member 1 as shown in FIG. It is the process of shape | molding.

Here, the upper surface 1a and the bottom surface 1b of the main body member 1 are formed in a flat plane shape, and the edges of the metal plate are opened on the upper surface 1a to form an opening 1a-1. Further, the left and right side surface portions 1c and 1d of the main body member 1 are formed into a corrugated shape by two folds of concave and convex portions, whereby the main body member 1 is formed into a semi-deployed shape.

  On the other hand, each of the side members 2 is formed into a substantially rectangular shape, and upper and lower end surfaces 2a and 2b thereof are formed into a flat plane following the flat upper and lower surfaces 1a and 1b of the main body member 1, and left and right side end surfaces 2c and 2d. Is shaped into a waveform following the waveform shape of the left and right side portions 1c, 1d of the main body member 1. And, as shown in detail in FIG. 2, the plane portion (center portion) 2e surrounded by the four circumferences (upper and lower end surfaces 2a and 2b and left and right side surfaces 2c and 2d) of the side member 2 is parallel to the vertical direction. It is formed by three horizontal broken lines a, b, c arranged in total and eight broken lines d, e, f, g, h, i, j, k that cross these broken lines a-c diagonally. A crease shape is provided, and R is provided at the top of each of the polygonal lines a to k as shown in FIG. FIG. 3 is an enlarged cross-sectional view taken along line AA in FIG. 2, and only the top of the broken line k is shown in this figure.

2) Joining process:
As shown in FIG. 4, the joining step is a step of obtaining the semi-deployed metal bag 10 ′ by joining the side members 2 to the peripheral edges of both openings of the main body member 1 formed by the single product forming step. Specifically, the outer peripheral edge of each side member 2 is fitted into the peripheral edge of each opening portion of the main body member 1, the fitting portion is welded, and the edges of the metal plates constituting the main body member 1 are butted together and welded. Thus, a semi-deployed metal bag 10 'is obtained.

  In the present embodiment, welding (brazing welding, laser welding, seam welding, etc.) is employed as the joining means, but mechanical joining means such as hem, caulking, curl, etc. may be used instead. Depending on the case, a sealant may be used in combination.

3) Crushing process:
The crushing step is a step of crushing the metal bag 10 ′ having a semi-deployed shape obtained by the joining step with a press so as to be folded into a thin and compact shape. The semi-developed shape shown in FIG. When the metal bag 10 'is crushed by a press, as shown in FIGS. 5 (b) and 5 (c), the main body member 1 has a small crushing force along the folded portions provided on both side surface portions 1c and 1d. Similarly, each side member 2 is folded in an orderly manner with a small crushing force along the fold lines a to k formed therein, and finally folded thinly and compactly as shown in FIG. 5 (d). A metal bag 10 is obtained.

  Next, a usage pattern of the metal bag 10 (see FIG. 5D) manufactured through the above steps is shown in FIG.

  That is, FIG. 6 is a side view of the front portion of the automobile 20, and the thin and compact metal bag 10 manufactured by the method of the present invention is incorporated in the front bumper 21 of the automobile 20. In FIG. 6, 22 is a vehicle body, 23 is a front wheel, and 24 is a windshield.

  Thus, when a strong impact force acts on the front bumper 21 due to a collision of the automobile 20 or the like, a sensor (not shown) detects this and activates a gas generator (inflator) (not shown). Gas is instantaneously supplied into the metal bag 10. As a result, the metal bag 10 is instantly expanded (expanded) by the gas pressure as indicated by a broken line in FIG. 6, and absorbs an impact at the time of collision to alleviate this. Once the metal bag 10 is expanded (expanded), even when the gas inside is released, the metal bag 10 maintains its shape when expanded due to plastic deformation of the metal.

  Here, the state change in the process in which the folded and set metal bag 10 is expanded (expanded) is shown in FIGS. 7A to 7C, and the metal bag 10 in the set state shown in FIG. Is expanded (expanded) as shown in (c) through the process shown in (b) of FIG.

  As described above, in the manufacturing method according to the present invention, the metal bag 10 ′ once formed into a semi-deployed shape is crushed by a press or the like and finished into a folded shape. It is thin and compact, requires only a small installation space, and secures a large expansion allowance to achieve its intended function.

  Further, when the metal bag 10 ′ once formed into a semi-deployed shape is crushed in the crushing step, the side member 2 is folded in an orderly manner with a small crushing force along the fold lines a to k formed on the metal bag 10 ′. Since they are folded in an orderly manner along the folding portion provided therein, wrinkles are not overlapped, and the side member 2 and the body member 1 are not damaged. As a result, when the metal bag 10 is inflated (deployed), the metal bag 10 is not cracked or perforated, or the metal bag 10 bursts, and the metal bag 10 has high permeability. The shape at the time of expansion can be maintained, and the intended function can be sufficiently achieved.

  Furthermore, since the deformation resistance due to wrinkles overlap is suppressed to a small level when the metal bag 10 is expanded (inflated), the metal bag 10 is expanded (inflated) with a small pressure (internal pressure), and the expansion (inflated). Speed is increased.

  In addition, since R is provided at the top of the fold-shaped fold lines a to k formed on the side member 2, the crease shape is displaced due to the difference in shape between the molding and unfolding of the side member 2 at the top of the fold lines a to k. It can be absorbed by R, and the excessive deformation of the side member 2 is prevented.

  By the way, the number of folding portions provided in the semi-deployed metal bag 10 ′ can be set according to the developed height of the folded metal bag 10, specifically, the developed height of the metal bag 10. By increasing the number of steps of the folding portion as the height is higher, any metal bag 10 having a low to high height when inflated can be manufactured according to its application.

  For example, as shown in FIG. 8, the body member 1 of the semi-deployed metal bag 10 ′ is provided with a large number of folding portions corresponding to the height thereof, and is crushed in a crushing step, thereby FIG. The metal bag 10 folded as shown in FIG. 9C can be obtained by crushing through the process shown in FIG. In this case, since the damage generated on the side member 2 is small as described above, even the metal bag 10 ′ having a high height and semi-deployed shape can be folded in a multi-stage compact manner. And the metal bag 10 obtained in this way can expand | deploy (expand) through the process shown to Fig.10 (a)-(c), and can perform the function intended.

  The metal bag manufactured by the method of the present invention is housed in a side airbag that protects an occupant from an impact from the outside of the door by being incorporated in a door of an automobile, a hood, etc. Other safety devices that reduce damage to passengers as an auxiliary device for seat belts, safety devices that are built into seats to prevent passengers from moving forward in the event of a collision, and other arbitrary devices such as disposable jacks Can be used for applications.

It is a perspective view of a main body member and a side member obtained by a single article molding process in the method of the present invention. It is a perspective view of the side member obtained by the single-piece molding process in the method of the present invention. It is an AA line expanded sectional view of FIG. It is a perspective view of the semi-deployed shape metal bag obtained by the joining process in the method of the present invention. (A)-(d) is a perspective view which shows the crushing process of the metal bag in the crushing process in this invention method in order. It is a side view of the front part of a car showing the usage pattern of the metal bag manufactured by the method of the present invention. (A)-(c) is a perspective view which shows the expansion | deployment (expansion) process of the metal bag manufactured by this invention method in the order. It is a perspective view which shows the other form of the metal bag of a half expansion | deployment shape. (A)-(c) is a perspective view which shows the crushing process of the metal bag shown in FIG. 8 in order. (A)-(c) is a perspective view which shows the expansion | deployment (expansion) process of the metal bag shown in FIG.9 (c) in that order.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body member 2 Side member 10 Folded metal bag 10 'Semi-deployed shape metal bag ak Polygonal line

Claims (2)

1) A cylindrical main body member formed into a shape in which the left and right side surface portions of the cylindrical shape have concave and convex folded portions ;
A member that closes the opening of the main body member, and the left and right side end surfaces are formed in accordance with the shape of the left and right side surface portions of the main body member, and are arranged in parallel in the vertical direction on a plane portion surrounded by four rounds. A fold shape formed by a plurality of broken lines and a plurality of broken lines obliquely intersecting these broken lines, a side member provided with R at the top of each broken line ;
A single product molding process in which each is formed into a semi-deployed shape by press molding of a metal plate,
2) A joining step of joining the side member to the peripheral edge of the opening of the main body member formed by the single product forming step to obtain a semi-deployed metal bag;
3) A crushing step of crushing a semi-deployed shape metal bag obtained by the joining step into a folded shape by pressing .
The metal bag manufacturing method characterized by obtaining the metal bag of the shape folded through. The number of stages of the folding unit, folded method of producing metal bag according to claim 1, wherein the set according to the height expansion of the metal bag.

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