JPH0716743B2 - Manufacturing equipment for laminated metal wire compacts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is combined with a gas generator such as an airbag for an automobile, an injection device for an emergency escape seat of an aircraft, an emergency opening / closing device for a valve, and a buoyancy generator for a ship. The present invention relates to an apparatus for manufacturing a gas wire laminated compression body such as a gas filter and its spring material.

(Prior Art) As a gas generator of this type, a method of using a high-temperature gas generated by burning explosive is widely adopted, but gas cooling for avoiding damage to a bag and harmful components in the gas are used. It is necessary to use a gas filter to remove the. As the gas filter for this purpose, a laminate of a plurality of stainless steel wire nets, a metal foam, a metal baffle plate, or the like is used.

However, since the conventional gas filters as described above have insufficient elasticity, a gap is generated when they are housed in the casing, and high-temperature gas easily short-passes. However, many problems remain such that the gas filter itself is non-homogeneous, short-circuiting of high-temperature gas is likely to occur, and it takes a lot of trouble to load the gas into the casing.

Therefore, the inventors of the present invention first preliminarily formed a wavy wire obtained by stretching a coiled metal wire into a ring shape, and further pressing the wire wire into a compressed metal wire rod gas filter. We have developed a manufacturing method for, but many of the problems are that wire rods with stretched coils tend to twist and are difficult to handle, the process is complicated and automation is difficult, and the mold for compression molding is easily damaged. Problem was left.

Further, there is a spring material in which an external force is applied to the entire wire material to give a “twist” to bend the wire material, and then the wire material is laminated and pressure-molded.
No. 63-93440. However, this is because the bent shape of the wire is simple and regular, so the entanglement between the wires is low, and the self-holding property of the shape is relatively low even after it is laminated and pressed into a spring material, and vibrations during use and other There is a high possibility that they will gradually fall apart due to the application of external force, and the places where they will be used are limited. That is, it is desirable that the place where the spring material is placed is a closed space, and that there is a condition where the shape of the spring material can be maintained by external regulation.

In addition, the latter method as a wire shape processing method requires tension to be applied to the entire wire in order to give "twist", and there is a possibility of cutting the wire due to adjustment, making adjustment difficult and making the device itself complicated and expensive. There was a drawback that

Further, a disc spring-shaped spring material for stably supporting explosives and the like is used in the gas generator as described above, but this spring material is also required to be formed by a metal wire laminated compression body. However, there is a problem similar to the above in the production thereof.

(Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, and even if the place of use is not a closed space, the self-holding property of the shape is high, so that the present invention can be used at any place. Can be easily filled into the casing, and it is difficult to create a gap between the casing and
Efficient and easy manufacturing of metal wire laminated compression bodies such as gas filters and spring materials, which are easy to process thick metal wire and are not easily melted, and which are themselves homogeneous and do not cause short-pass of high-temperature gas. It has been completed in order to provide a manufacturing apparatus capable of manufacturing.

(Means for Solving the Problems) The present invention made to solve the above problems includes a feeder for a metal wire rod, a pair of first gears that bend the supplied metal wire rod in a wavy manner on one plane, And a pair of second gears having a smaller module than the first gear that bends the metal wire supplied from the first gear while regulating the direction by a guide, and bends the metal wire in a direction different from the plane. Mechanism, a tension adjusting mechanism for the bent metal wire, a winding mechanism for the metal wire with a uniform winding guide, and a compression molding machine for the wound metal wire. This can be solved by the manufacturing device of the compressed body.

Hereinafter, the present invention will be described in more detail with reference to Examples.

(Embodiment) FIG. 1 shows an embodiment of the present invention. (1) is a feeder for a metal wire, (2) is a bending mechanism for the metal wire, (3)
Is a tension adjusting mechanism for the metal wire, (4) is a cutting mechanism for the metal wire, and (5) is a winding mechanism for the metal wire.

When manufacturing a gas filter, a heat-resistant metal wire material such as stainless steel is used as a material. If the wire diameter of the metal wire is too thin, it may melt due to contact with high-temperature gas, and if it is too thick, it becomes difficult to process and the gas passage becomes large and the function as a gas cooling and filter deteriorates. Therefore, the wire diameter is 0.1 ~
Heat resistant steel wire of about 1.5 mm is preferable.

The feeder (1) has a wire rod drum (7) supported on two rollers (6). The metal wire rod is drawn downward so as not to jump out of the roller (6), and a bending mechanism ( Enter 2). In addition, in order to prevent the wire rod drum (7) from rotating and the excess metal wire rod being fed due to inertia when stopped, one side of the roller (6) has an electromagnetic brake (8).
Is preferably provided.

The bending mechanism (2) is composed of a pair of first gears (9), (9) meshing with each other and a pair of second gears (10), (10) having a smaller module. In order to avoid breakage of the metal wire in the bending process, the tension of the metal wire is kept constant with the diameters of the first gear (9) and the second gear (10) being the same. Also, due to the difference in module between the first gear (9) and the second gear (10),
If both are rotated at the same speed, there will be a slight difference in the feed speed, which will cause wire breakage. Therefore, if a rotation speed adjusting mechanism such as a conical belt type or a variable pitch pulley type is interposed between both gears, disconnection can be reliably prevented.

First, the metal wire rod is bent in a wavy shape (planar wavy) on one plane at a constant pitch while passing between the first gears (9) and (9). This first gear (2) has its module 4.0-1.0
Spur gears are suitable. Next, guide the metal wire (1
It passes between the pair of second gears (10), (10) which are meshed with each other while being regulated in direction. Second gear (1
When entering the (0), the metal wire is naturally twisted so that the curved surface of the first gear (9) is parallel to the tooth surface of the second gear (10), but between the second gear (10) and (10). When passing through, a concavo-convex (three-dimensional waveform) that is bent in a three-dimensional wave shape in different directions with respect to this bending surface is formed. The second gear (10) is a spur gear whose module is 2.0 to 0.5, and thus the first gear is
By changing the module of the gear (9) and the module of the second gear (10), it is possible to obtain a metal wire rod that is bent in a wavy shape at different pitches in different directions.

Here, the module of the second gear (10) is made smaller than the module of the first gear (9), if this module is kept the same, the wire rod twisted by the guide (11) is elastic due to its elasticity. This is because the bent shape formed by entering the second gear (10) along the tooth profile formed by (9) and eventually being the same as the shape formed by the first gear (9). The module of the second gear (10)
The ratio of the module M1 of the first gear (9) to M2 is M1 / M
It is preferable that 2 = 1.5 to 2.5. In this embodiment, the bending pitch is 5 to 10 mm and the wave height is 3 to 6 mm, but the wave height and the feed rate can be changed by adjusting the axial distance between the pair of gears. The first gear (9) and the second gear (10) are driven by a brake motor with an electromagnetic magnet, and the acceleration and deceleration of the gear are controlled by inverter control to strictly control the weight of the metal wire to be sent. It is preferable.

The tension adjusting mechanism (3) for the metal wire rod has a pulley (13) attached to the tip of the balance rod (12) and a weight (14) attached to the other end thereof to keep the tension of the metal wire rod constant. When the tension becomes excessive, the balance bar (12) rises to come into contact with the sensor (15), and the drive motor of the bending mechanism (2) increases the number of rotations so that excess metal wire can be sent out.

The metal wire cutting mechanism (4) is provided with an air-driven cutter (17) between a pair of front and rear air clamps (16), and clamps the metal wire after the metal wire of a predetermined length is delivered. , Disconnect. A cushioning material such as rubber is attached to the contact portion of the air clamp (16) to prevent the bent metal wire from being deformed. Also, the operation of the cutter (17) is delayed by a timer from the operation of the air clamp (16) by one second or more, so that the metal wire rod can be reliably clamped.

The metal wire winding mechanism (5) includes a winding roller (19) which is rotated by a motor (18) whose rotation speed is adjustable, and a uniform winding guide (20) which is interlocked with the winding roller (19). The uniform winding guide (20) is reciprocated by the feed screw (21), and the roller (22) at the end of the feed screw (21) is connected to the shaft of the winding roller (19) via a bevel gear. The feed screw (21) is rotated in both forward and reverse directions by bringing it into contact with either of the pair of drive discs (23) and (24), and the uniform winding guide (20) is reciprocated. Take-up roller (19)
When is rotated a predetermined number of times, a cylinder (not shown) pushes a drum having drive discs (23) and (24) so that the drive disc (23) comes into contact with the roller (22), and the take-up roller (19) moves. When the cylinder is further rotated a predetermined number of times, the cylinder retracts and the drum provided with the drive disks (23) and (24) returns by the force of the spring (25), and the drive disk (24) and the roller (22) as shown in the figure.
Are in contact with each other. In this way, the metal wire is evenly wound around the winding roller (19) while being guided by the uniform winding guide (20). When the winding of a certain amount of metal wire is completed, the cutting mechanism (4)
Ends are cut by.

The wound metal wire rod is fixed as it is or around its periphery with a metal fastening wire rod (26) as shown in FIG. 2 and then pressed into a predetermined shape by a compression molding machine (27). The compression molding machine (27) has an annular molding punch (2
8), a core die (29), an outer die (30), and a protrusion die (31). The wound metal wire is manually pushed into the space between the core die (29) and the outer die (30) and pressed by the forming punch (28), but the metal wire sticks out from the gap. In order to avoid scratching the mold, the hardness of 60 to 10
It is preferable to apply compression molding by applying an elastic ring (32) made of urethane rubber or the like having a tensile strength of 200 to 450 kg / cm ^{2 and} the like. As a result, it is possible to prevent the metal wire rod from protruding from the gap between the molds and damaging the mold, or causing defective products. The bulk specific gravity after compression molding is preferably 1.0 to 3.0.

FIG. 4 is a view showing a modified example of the compression molding machine (27), in which an upper press head (33) is provided with a metal wire rod pushing punch (34) and a molding punch (28). is there. It is preferable that the pushing punch (34) is smaller than the outer diameter of the forming punch (28) by 1 mm or more and the inner diameter thereof is 1 mm or more. The upper press head (33) can move in the horizontal direction. First, the push-in punch (34) is positioned directly above the core die (29) and the outer die (30) to remove the wound metal wire. Lightly press it between the core mold (29) and the outer mold (30), and then insert the molding punch (28) into the core mold (29) and the outer mold (30).
The press molding is performed by arranging it just above. This can reduce the manual pushing work. The lower press head may be slid to sequentially move the lower mold below the pushing punch (34) and the forming punch (28). In this way, the desired gas filter, a laminated metal wire rod compression body such as a spring material, and the like can be obtained.

FIG. 5 shows a usage example in which the metal wire laminated compression body F obtained by the manufacturing apparatus of the present invention is incorporated in a gas generator for an air bag of an automobile. In the figure, (35) is a casing, and the outer and inner metal wire rod laminated compressed bodies F, F are loaded on both sides of the partition wall (36) inside thereof. Ignition chamber (3
The inside of 7) is loaded with an igniter (38) and an ignition powder such as phosphorus nitride that is easy to burn.
Explosives such as sodium azide (Na ₂ N) in 9) explosively burned to generate a large amount of high-temperature gas (nitrogen gas) at 1000 to 1200 ° C, and this high-temperature gas was filled in the lower part. Removal of harmful components in the gas and cooling of the high-temperature gas are performed while sequentially passing through the inner and outer metal wire rod laminated compacts F, F. Then, the appropriately cooled gas is supplied to the gas utilization side such as an airbag.

Further, the gas generator of FIG. 5 incorporates a metal wire laminated compression body S which is a disc spring-shaped spring material obtained by the manufacturing apparatus of the present invention, and elastically supports the explosive in the explosive chamber (39). is doing.

(Effects of the Invention) As described above, the metal wire rod laminated compression body manufacturing apparatus of the present invention includes the pair of first gears and the first gears that bend the metal wire rods supplied from the feeder into a wavy shape on one plane. Since the bending process is performed in a three-dimensional wave shape by the bending mechanism including the pair of second gears having a module smaller than the first gear that bends the supplied metal wire rod while controlling the direction by the guide from the first gear, The metal wire rod laminated compressed body obtained by compression molding this metal wire rod is intimately entangled with each other and has a high self-holding property, so there is no limitation in the place of use, and it is homogeneous and has a short gas path inside. The structure is such that the path is difficult to form. Moreover, since this metal wire laminated compression body has an appropriate elasticity, it can be easily loaded into the casing, and no gap is formed between the casing and the casing. Further, the apparatus for manufacturing a laminated body of compressed metal wire of the present invention comprises a tension adjusting mechanism for a bent metal wire and a winding mechanism for a metal wire provided with a uniform winding guide.
The bent metal wire can be wound with a uniform tension and a uniform density, which is suitable for producing a uniform compressed metal wire laminate. Further, the apparatus for producing a compressed metal wire laminate according to the present invention is equipped with a compression molding machine for wound metal wire and can press it into a predetermined shape. A compressed body can be manufactured.

As described above, the present invention is a device for manufacturing a laminated body of metal wire rods that solves the conventional problems. Therefore, for example, a metal that can be used as a gas filter or a spring material used in a gas generator for an airbag of an automobile. The laminated wire compact can be manufactured easily and efficiently, which greatly contributes to the development of the industry.

[Brief description of drawings]

1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view showing a wound metal wire, FIG. 3 is a sectional view showing a compression molding machine, and FIG. 4 is a modification thereof. FIG. 5 is a cross-sectional view showing a usage state of the obtained metal wire rod laminated compressed body. (1): feeder, (2): bending mechanism, (3): tension adjusting mechanism, (5): winding mechanism, (9): first gear, (1
0): Second gear, (20): Uniform winding guide, (27):
Compression molding machine, (28): Punch for molding, (32): Elastic ring, (34): Punch for pushing

Claims (4)

[Claims] 1. A feeder (1) for supplying a metal wire, a pair of first gears (9) for bending the supplied metal wire into a wavy shape on one plane, and a guide (11) from the first gear (9). Bending of the metal wire comprising a pair of second gears (10) having a smaller module than the first gear (9) that bends the supplied metal wire in a direction different from the plane while controlling the direction by Mechanism (2), tension adjusting mechanism (3) for bent metal wire, winding mechanism (5) for metal wire provided with uniform winding guide (20), and compression molding for wound metal wire And a machine (27). 2. The metal wire rod laminated compression according to claim 1, wherein the bending mechanism (2) of the metal wire rod has a rotation speed adjusting mechanism between the first gear (9) and the second gear (10). Body manufacturing equipment. 3. The apparatus for manufacturing a metal wire laminated compression body according to claim 1, wherein the metal wire compression molding machine (27) presses the metal wire through the elastic ring (32). 4. The metal wire rod laminated compression body according to claim 1, wherein the metal wire rod compression molding machine (27) includes a metal wire rod pushing punch (34) and a molding punch (28). Manufacturing equipment.