JPH1110266A - Method for shaping edging part of wire netting material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily shape an edging part by forming the reinforcing edging part on the outer edge side of a material of a wire netting with a single pressing. SOLUTION: After a wire netting material 8 is shaped in a circular shape from a wire netting blank in a shaping process, a bending part 8A is formed by vertically bending the outer edge part of the wire netting material 8 in the bending process. Further, in the edging process, by deforming with compressing this bending part 8A to the vertical direction so as to execute buckling, a thick wall edging part 8B is shaped on the outer edge part of the wire netting material 8. Then, these shaping process, bending process and edging process are practised with the continuous press working of one time. Further, a filter element of a flow detector, etc., is formed with this wire netting material 8 and the rigidity is kept surely at the edging part 8B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for shaping a wire mesh material, which is preferably used for a filter element for removing dust from air, for example.

[0002]

2. Description of the Related Art Generally, an automobile engine or the like is provided with a flow rate detecting device for detecting an intake air amount. The flow rate detecting device is provided in a cylindrical housing and provided in the housing. And a filter element (mesh-like screen plate) provided in the housing and located in the housing at a position upstream of the detection section. I have.

[0003] A filter element provided in this type of conventional flow rate detecting device is formed by shaping a wire mesh material formed by weaving a plurality of metal wires or the like in a lattice shape into a circular shape. It is composed of a mesh portion that allows the intake air and the like of the engine to flow therethrough and captures dust and the like contained in the air, and a ring-shaped outer frame portion that is caulked and fixed to the outer peripheral side of the mesh portion. .

Here, the outer frame of the filter element is
For example, an annular plate made of a metal material such as aluminum is plastically deformed into a substantially U-shaped cross section, and is folded over the entire outer periphery of the mesh portion to form an edge portion of the mesh portion. It is configured to reinforce the mesh part from the outside.

The filter element is fixed to the housing of the flow rate detecting device by fixing the outer frame portion to the housing or the like so as to prevent the filter element from coming off. The filter element rectifies the intake air flowing in the housing by the mesh part, stabilizes the flow of the intake air, and captures and removes dust and the like in the intake air, thereby protecting the flow rate detection element from dust and the like. It is.

[0006]

However, in the above-mentioned prior art, in order to increase the rigidity of the filter element,
For example, since the outer frame portion made of an aluminum plate or the like is fixed to the outer edge side of the mesh portion by caulking or the like, the number of parts of the filter element increases, extra labor is required for parts management, and at the time of assembly, Post-processing for caulking and fixing the outer frame portion to the outer edge portion side of the mesh portion is required, and there is a problem that workability during assembly is reduced.

The present invention has been made in view of the above-mentioned problems of the prior art. In the present invention, a reinforcing rim can be formed on the outer edge side of a wire mesh material by a single pressing operation, and the shaping of the rim can be easily performed. It is another object of the present invention to provide a method of shaping a wire mesh material in which a sufficient rigidity can be ensured by a border even when the filter element is formed only of a wire mesh material, and an apparatus therefor.

[0008]

In order to solve the above-mentioned problems, a method for shaping a wire mesh material employed in the invention according to claim 1 is a method for shaping a wire mesh material into a predetermined plane shape. Forming a bent portion on the outer edge side of the shaped wire mesh material, bending the outer edge portion of the wire mesh material substantially vertically, and buckling the bent portion of the wire mesh material. In the vertical direction as described above to form a thick rim on the outer edge side of the wire mesh material.

Thus, after forming a bent portion on the outer edge side of the wire mesh material formed into a predetermined planar shape, the bent portion is vertically compressed and deformed so as to buckle. A thick edge portion can be formed on the outer edge side of the wire mesh material, and at least the bending step and the edge step can be performed by a continuous pressing operation.

[0010] In a second aspect of the present invention, there is provided an apparatus for shaping a wire mesh material, wherein the wire mesh material is sandwiched between a lower mold supporting the wire mesh material from below and the lower mold. An upper die for forming a thick edging portion on the outer edge side of the wire mesh material, wherein the lower die is formed in a stepped cylindrical shape and the upper end side is a thin-walled receiving portion, and a fixed cylinder inside the fixed cylinder. A movable table having an upper end surface movably provided up and down and protruding above a receiving portion of the fixed cylinder and having a supporting surface made of a wire mesh material; A first biasing means for allowing the base to be displaced from a raised position to a lowered position, wherein the upper die is formed in a stepped cylindrical shape having an inner diameter corresponding to an outer periphery of a receiving portion of the fixed cylinder, and has a lower end. Side is a pressing surface that bends the outer edge side of the wire mesh material downward with the outer periphery of the bearing surface of the movable table. A bending punch having a pressing shape, wherein the pressing punch is provided in the bending punch so as to be able to move up and down and has a lower end surface serving as a pressing surface for holding the wire mesh material between the supporting surface of the movable table and the pressing punch; A second urging means for urging the pressing punch downward with a lower urging force than the first urging means and allowing the pressing punch to move up and down with respect to the bending punch. doing.

According to the above configuration, for example, when the entire upper die is driven toward the lower die while the wire mesh material is placed on the movable base (supporting surface) of the lower die, the pressing surface of the upper die has a pressing surface of the lower die. And the second urging means is bent and deformed by the reaction force at this time while holding the wire mesh material between the movable table and the bearing surface of the movable table. As a result, the pressing surface of the pressing punch recedes above the pressing surface of the bending punch, and the pressing surface of the bending punch folds the outer edge side of the wire mesh material downward with the outer periphery of the support surface of the movable table. By bending, a bent portion is formed on the outer peripheral side of the wire mesh material.

If the driving of the upper die is further continued in this state, the movable base of the lower die is displaced from the raised position to the lowered position by the driving force at this time against the first urging means. . With this, the upper die continues to press the pressing surface of the pressing punch toward the support surface of the movable base while displacing the bending punch downward along the outer periphery of the receiving portion of the fixed cylinder, so that the wire mesh material is bent. The part is sandwiched between the outer circumference of the support surface of the movable base and the bending punch, and is vertically compressed and deformed so as to be buckled between the outer circumference of the pressing surface of the pressing punch and the receiving part of the fixed cylinder. Then, the bent portion of the wire mesh material can be shaped as a thick rim.

Further, in the invention of claim 3, the lower die is formed in a ring shape with an inner diameter corresponding to the outer periphery of the pressing surface of the bending punch, and the wire mesh material is formed between the lower die and the bending punch. The configuration is such that a shaping die for shaping in a circular shape is provided.

Thus, for example, when the entire upper die is driven toward the lower die with the wire netting material placed on the bearing surface of the movable base, the gap between the pressing surface of the pressing punch and the bearing surface of the movable base is established. With the wire mesh material sandwiched, the pressing surface of the bending punch is pressed downward along the inner periphery of the shaping die, and the wire mesh material is shaped into an outer diameter corresponding to the inner diameter of the shaping die. In addition, the outer peripheral side of the wire mesh material can be bent downward between the outer peripheral side of the movable table and the outer peripheral surface of the movable table by the pressing surface of the bending punch.

[0015]

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

FIGS. 1 to 11 show an example in which the apparatus for shaping a wire mesh material according to an embodiment of the present invention is used for forming a filter element for a flow rate detecting device. .

In the drawing, reference numeral 1 denotes a flow detecting device for an automobile engine, 2 denotes a housing of the flow detecting device 1, and the housing 2 is formed in a stepped cylindrical shape from a heat-resistant resin material or the like, and an intake pipe of the engine is provided. (Not shown) are provided on the way. The housing 2 is formed integrally with the cylindrical portion 3 having an inner peripheral side serving as a flow path of intake air sucked toward a combustion chamber (not shown) of the engine, and is formed integrally with the cylindrical portion 3. And a circuit housing 4 having a substantially rectangular box shape.

As shown in FIG. 3, the cylindrical portion 3 of the housing 2 has a thin-walled open end 3B whose diameter is increased through an annular step 3A at the upstream end thereof. A concave groove 3C for mounting a filter element 6 described later is formed over the entire circumference. As shown in FIG. 2, a total of four caulked portions 3D, 3D,... Are formed at intervals of, for example, about 90 ° on the outer peripheral side of the concave groove portion 3C. The groove 3C
It is fixed inside.

On the other hand, a signal processing circuit (not shown) and the like are housed in a circuit housing section 4 of the housing 2, and this signal processing section amplifies a detection signal from a detection section 5 described later, and
It performs signal processing such as waveform shaping. As shown in FIG. 1, a connector portion 4A is integrally provided on the outer surface of the circuit housing portion 4, and the connector portion 4A transmits a processing signal from the signal processing portion to an external control unit (not shown) or the like. Output.

Reference numeral 5 denotes a detecting portion provided in the cylindrical portion 3 of the housing 2. The detecting portion 5 is provided with a flow detecting element (not shown) made of a heat-sensitive resistor or the like. By detecting the flow rate of the intake air as a flow rate by contacting the intake air flowing through the cylindrical portion 3, the detection signal is output to the signal processing unit side.

Reference numeral 6 denotes a filter element provided on the side of the opening end 3B of the cylindrical portion 3. The filter element 6 is formed from a wire mesh material 7 shown in FIG. After shaping the material 8, the wire mesh material 8 is formed by shaping a later-described edge portion 8 </ b> B as shown in FIG. 11.

Here, as shown in FIG. 3, the filter element 6 has an outer diameter slightly smaller than the open end 3B of the tubular portion 3. The outer periphery of the filter element 6 is formed as an outer frame 6A formed of a rim 8B of the wire mesh material 8, and the inner periphery of the outer frame 6A has an intake air flow from the upstream side to the downstream side of the cylindrical portion 3 as indicated by an arrow. The mesh portion 6B allows distribution in the direction of.

The outer frame 6A of the filter element 6
In the state fitted in the concave groove 3C formed in the annular step portion 3A of the cylindrical portion 3, each caulking portion 3D is heat caulked as shown in FIG. It is fixed by caulking. As shown in FIG. 3, the mesh portion 6B of the filter element 6 stabilizes the flow of the intake air by flowing the intake air through the inside of the cylindrical portion 3 in the direction of the arrow, and the dust mixed in the air. By trapping such foreign substances, the foreign substances are prevented from entering the downstream side (detection section 5), and the flow rate detecting element and the like of the detection section 5 are protected from the foreign substances.

Next, with reference to FIGS. 4 to 9, the shaping process of the edging portion 8B for the wire mesh material 8 will be described.

In FIG. 4, reference numeral 11 denotes a shaping machine as an apparatus for shaping a wire mesh material formed of a press machine or the like. As shown in FIGS. 4 to 7, the shaping machine 11 holds the wire mesh material 8 from below. A lower mold 12 to be supported and an upper mold 13 for forming a thick rim 8B on the outer edge side of the wire mesh material 8 while holding the wire mesh material 8 between the lower mold 12 and the upper mold 13 Is composed of an upper mold plate 24, a bending punch 28, a pressing punch 29, and respective holding springs 30 which will be described later.

Reference numeral 14 denotes a lower die plate serving as a base of the lower die 12, reference numeral 15 denotes a die holder positioned on the lower die plate 14 via a fixing ring 16, and the die holder 15 is formed in a stepped cylindrical shape. The shape is such that a later-described crush ring 17 is retained from the outer peripheral side in a retaining state. The die holder 15 is formed with a predetermined height (length in the axial direction), and holds a shaping die 23 to be described later on the upper end side. The fixing ring 16 is positioned on the lower mold plate 14 via a pin or the like, and restricts the die holder 15 from being displaced in the radial direction on the lower mold plate 14.

Reference numeral 17 denotes a crush ring as a fixed cylinder fitted and fixed to the inner peripheral side of the die holder 15, and the crush ring 17 is formed in a stepped cylindrical shape as shown in FIG.
It is positioned on the lower mold plate 14 via a die holder 15. The upper end side of the crush ring 17 serves as a receiving portion 17A and is formed in a thin cylindrical shape.
The upper end surface of 7A is a receiving surface for compressing and deforming a bent portion 8A of the wire mesh material 8 described later with the pressing punch 29 in the axial direction.

Reference numeral 18 denotes a work holder as a movable table slidably disposed on the inner peripheral side of the crush ring 17, and the work holder 18 is formed as a stepped cylindrical block as shown in FIG. An annular protrusion 1 is provided on the outer periphery of the lower end side.
8A are formed. The work holder 18 is held at a raised position by a support spring 19 described later. At this raised position, the protrusion 18A is engaged with the inner peripheral side of the crush ring 17 and is held in a retaining state.

The work holder 18 has an axial dimension (height dimension) longer than the crush ring 17 by a certain dimension.
The upper end surface thereof is a support surface 18B of the flat wire mesh material 8. When the work holder 18 is displaced to the lowered position shown in FIG. 7, the support surface 18B of the work holder 18
The upper end of the receiving portion 17A and the pressing punch 29
This ensures that the edge 8B of the wire mesh material 8 is shaped to be thick.

Reference numeral 19 denotes a support spring which is provided between the work holder 18 and the spring receiver 20 and constitutes a first urging means.
The support spring 19 is, for example, 200 to 500 kg / cm ^2.
Is set to a relatively high spring force.
Is always urged upward, and the work holder 18 is allowed to be displaced to the lowered position shown in FIG. The spring support 20 is screwed into a screw hole 14A formed in the center of the lower die plate 14, and variably adjusts the spring force of the support spring 19 according to the screwing position.

Are push pins inserted in the work holder 18 so as to be able to move up and down at regular intervals.
The push pin 21 is constantly urged upward by each weak spring 22, and the upper end thereof is supported by a support surface 18 </ b> B of the work holder 18.
Slightly projecting from When the wire mesh material 8 is held between the work holder 18 and the pressing punch 29 of the upper mold 13, each pushing pin 21 is pressed down against each weak spring 22 by the holding force at this time, and FIG. As shown in FIG. 7, the state is kept pressed down into the work holder 18.

Reference numeral 23 denotes a shaping die fixed to the upper end of the die holder 15 via bolts or the like. The shaping die 23 has a ring shape having an inner diameter corresponding to the outer periphery of a pressing surface 28A of a bending punch 28 described later. Is formed. Then, as shown in FIG.
8 is pressed downward, the bending punch 28
The wire mesh material 8 is formed in a circular shape from the wire mesh material 7 shown in FIG.

Next, reference numeral 24 denotes an upper plate serving as a support portion of the upper die 13, and 25 denotes an upper fixing ring positioned on the outer peripheral side of the upper plate 24 via a pin or the like. It is hung downward from the upper die plate 24 and holds a pressing ring 26 described later in a retaining state.

An upper pressing ring 26 is provided on the inner peripheral side of the fixing ring 25 so as to be movable up and down.
Numeral 6 is formed in a stepped cylindrical shape, and is constantly urged downward by a spring 27 with a spring force of, for example, about 40 to 80 kg / cm ² . The pressing ring 26 is shown in FIG.
As shown in FIG. 7, the wire mesh material 7 is sandwiched between the shaping die 23 and regulates the displacement of the wire mesh material 7 when the wire mesh material 8 is shaped by the bending punch 28.

Reference numeral 28 denotes a bending punch located on the inner peripheral side of the pressing ring 26 and fixed to the upper die plate 24 with bolts or the like. The bending punch 28 has an inner diameter corresponding to the outer periphery of the receiving portion 17A of the crush ring 17. It is formed in a stepped cylindrical shape with dimensions, and hangs downward from the upper die plate 24. Then, the lower end surface of the bending punch 28 becomes an annular pressing surface 28A, and the pressing surface 28A is the upper die 13 shown in FIG.
At the standby position, the extension extends to a position corresponding to the lower end surface of the pressing ring 26.

Here, the pressing surface 28A of the bending punch 28
When the entire upper die 13 is pressed downward as shown in FIG. 6, the space between the work holder 18 of the lower die 12 and the shaping die 23 is pressed toward the outer peripheral side of the receiving portion 17A of the crush ring 17, Outer peripheral side of pressing surface 28A and shaping die 23
Of the wire mesh material 8 is formed between the inner peripheral side of the wire mesh material 8 and the outer peripheral side of the wire mesh material 8 between the inner peripheral side of the pressing surface 28A and the outer peripheral surface of the work holder 18. .

Reference numeral 29 denotes a pressing punch slidably disposed in the bending punch 28. The pressing punch 29 has a stepped circle having an outer diameter slightly larger than that of the work holder 18, as shown in FIG. It is formed as a columnar block, and an annular protrusion 29A is formed on the outer periphery on the upper end side. The pressing punch 29 is at the standby position shown in FIG.
A is engaged with the inner peripheral side of the bending punch 28, and is held by the bending punch 28 in a retaining state. Further, a shallow recess 29B is formed in the center of the lower end surface of the pressing punch 29, and the periphery of the recess 29B is formed on the bearing surface 18 of the work holder 18.
An annular pressing surface 29 </ b> C for holding the wire mesh material with B is formed.

Are holding springs which constitute second urging means disposed between the pressing punch 29 and each spring support 31. Each holding spring 30 is a supporting spring on the lower mold 12 side. 19
Is set to a weak spring force (e.g. 50~120kg / cm ² or so) than the pressing as the pressing surface 29C protrudes into slightly lower than the bending punch 28 is at the standby position of the upper mold 13 shown in FIG. 5 The punch 29 is urged downward.

Each holding spring 30 is provided with a pressing punch 29.
When is pressed toward the work holder 18, a clamping force against the wire mesh material 8 is applied to the pressing punch 29, and the pressing punch 29 is allowed to move up and down with respect to the bending punch 28. It has become. In addition, each spring support 31
Is screwed into each screw hole 24A formed in the upper die plate 24, and the spring force of each holding spring 30 is variably adjusted according to the screwing position.

A mounting shaft 32 is screwed to the center of the upper die plate 24. The mounting shaft 32 projects upward from the upper die plate 24, and its protruding end has a movable part (see FIG. (Not shown) are connected. The entire upper die 13 is moved up and down together with the mounting shaft 32 between the standby position shown in FIG. 5 and the pressed position shown in FIG.

The flow rate detecting device 1 and the shaping machine 11 for the wire mesh material 8 according to the present embodiment have the above-described configuration. Next, the shaping portion 8B for the wire mesh material 8 using the shaping machine 11 is formed. 5 to 11 for the method
This will be described with reference to FIG.

First, in order to form the wire mesh material 8 from the long wire mesh material 7 shown in FIG. 10 into a circular shape, the wire mesh material 7 is placed on the work holder 18 of the lower mold 12 as illustrated in FIG. Place. At this stage, the push-out pins 21 slightly protrude from the support surface 18B of the work holder 18, thereby holding the wire mesh material 7 slightly separated from the support surface 18B, and holding the wire mesh material 8 on the left and right of the wire mesh material 8. Both ends protrude radially outward from the shaping die 23.

Next, in this state, the upper die 13 is pressed by a press machine.
When the whole is pressed in the direction indicated by the arrow A in FIG. 5, the pressing punch 29 of the upper die 13 is pressed onto the wire mesh material 7 via the pressing surface 29C, and each push pin 21 is pressed into the work holder 18. Meanwhile, the wire mesh material 7 is clamped from above and below between the support surface 18B of the work holder 18 and the work. At this time, the pressing punch 29 is displaced relative to the bending punch 28 by bending each of the holding springs 30 so that the pressing surface 29C of the pressing punch 29 is higher than the pressing surface 28A of the bending punch 28. To retreat.

The pressing ring 26 of the upper die 13 is indicated by an arrow A.
When pressed in the direction, the wire mesh material 7 is held between the shaping die 23 and the wire mesh material 7 together with the pressing punch 29.
The position of the camera. At this time, the bending punch 28 presses the pressing surface 28A between the work holder 18 of the lower die 12 and the shaping die 23 in the direction of arrow A, and the outer peripheral side of the pressing surface 28A and the shaping die 23 The shaping of the wire mesh material 8 with the inner peripheral side is performed as illustrated in FIG.

That is, the wire mesh material 7 is formed as a hoop material extending in a band shape with a fixed width as shown in FIG. 10, and is moved on the work holder 18 of the lower mold 12 by an arrow B in FIG.
It is transported at a constant pitch in the direction. Then, while moving the upper die 13 up and down between the standby position shown in FIG. 5 and the pressed position shown in FIG. 7, the wire mesh material 7 is transferred at a constant pitch in the direction of arrow B in FIG. As a result, a circular punched hole 7A is formed in the wire mesh material 7 between the outer peripheral side of the pressing surface 28A and the inner peripheral side of the shaping die 23, whereby the circular wire mesh material 8 is formed. (Shaping step in FIG. 11).

Next, when the pressing of the upper die 13 is further continued in this state, the pressing punch 29 is pushed onto each of the holding springs 30 until the upper end surface thereof comes into contact with the lower surface of the upper die plate 24 as shown in FIG. The pressing surface 28A of the bending punch 28 moves downward between the work holder 18 of the lower die 12 and the shaping die 23 toward the outer peripheral side of the receiving portion 17A of the crush ring 17.

As a result, as shown in FIG. 8, the outer edge of the wire netting material 8 formed into a circular shape as described above has a pressing surface 28.
A is bent vertically downward between the inner peripheral side of A and the outer periphery of the bearing surface 18B of the work holder 18, and a ring-shaped bent portion 8A is formed on the outer edge side of the wire mesh material 8 with a predetermined folding allowance. Is formed (bending step in FIG. 11).

Next, when the pressing of the upper mold 13 is further continued in this state, the pressing punch 29 pushes the work holder 18 downward through the wire mesh material 8 so that the work holder 18 resists the support spring 19. 7 and the lower surface thereof abuts on the lower die plate 14, and the support surface 18B of the work holder 18 is higher than the upper end of the receiving portion 17A of the crush ring 17 by a certain distance. Is held. The pressing surface 28A of the bending punch 28 comes into sliding contact with the outer peripheral side of the receiving portion 17A of the crush ring 17, as shown in FIG.

Thus, the bent portion 8A of the wire mesh material 8
Is a bearing surface 18B of the work holder 18 as shown in FIG.
With the lower end of the bent portion 8A abutting on the upper end of the receiving portion 17A of the crush ring 17 while being sandwiched between the outer peripheral side and the inner peripheral surface of the bending punch 28, the bent portion 8
The upper end side of A is pressed downward by the pressing surface 29C of the pressing punch 29. Thereby, the bent portion 8 of the wire mesh material 8
A is compressed and deformed in the vertical direction (axial direction) so as to buckle between the upper end of the receiving portion 17A and the pressing surface 29C, and a thick rim 8B is formed on the outer edge side of the wire mesh material 8. (Bordering step in FIG. 11).

Here, the bent portion 8 is formed on the outer edge side of the wire mesh material 8.
A is formed and the bent portion 8A of the wire mesh material 8 is formed while the bent portion 8A is formed into a thick rim 8B.
As shown in FIGS. 8 and 9, the flat portion 8 </ b> C inside the (edge portion 8 </ b> B) is strongly clamped from above and below between the support surface 18 </ b> B of the work holder 18 and the pressing surface 29 </ b> C of the pressing punch 29. Therefore, the pressing force of the bending punch 28 and the pressing punch 29 does not reach the flat portion 8C,
The mesh portion 6B of the filter element 6 shown in FIG. 3 can be maintained in a uniform lattice shape by the flat portion 8C.

The wire mesh material 8 has a thick rim 8B.
After molding, the entire upper die 13 is raised again to the standby position shown in FIG. 5, and at this time, each push-out pin 21 of the work holder 18 slightly protrudes from the bearing surface 18B, so that the wire mesh material 8 is removed. It is pushed up so as to remove the mold from the work holder 18. As a result, the wire mesh material 8 formed with the rim 8B can be easily taken out from the work holder 18, and the wire mesh material 7 is transferred at a constant pitch in the direction indicated by the arrow B in FIG. 7A (FIG. 10)
The wire mesh material 8 is formed from the wire mesh material 7 at a position (indicated by an imaginary line).

When the wire mesh material 8 formed with the thick rim 8B as described above is used as the filter element 6 of the flow rate detecting device 1 shown in FIG. 1, the outer frame of the filter element 6 is used. The portion 6A is a rim 8 of the wire mesh material 8.
B can be used as it is, and the entire flat portion 8C located inside the rim portion 8B can be used as the mesh portion 6B of the filter element 6.

The outer frame portion 6A of the filter element 6 composed of the rim portion 8B surrounds the outer peripheral side of the mesh portion 6B over the entire circumference, and the weight is reduced in a state where the thin metal wires of the wire mesh material 8 are densely packed. Since the mesh portion 6B through which the intake air or the like flows is reliably formed from the outside, the mesh portion 6B through which the intake air or the like flows can be reliably reinforced, and high rigidity can be given to the entire filter element 6.

When the filter element 6 is mounted on the housing 2 of the flow detecting device 1, the outer frame 6A of the filter element 6 is fitted into the concave groove 3C of the cylindrical portion 3 as shown in FIG. In the combined state, each caulked portion 3D is bent radially inward by thermally deforming the caulked portion 3D using a means such as ultrasonic caulking, and the outer frame portion 6A of the filter element 6 is formed into a concave groove portion of the cylindrical portion 3. Swage and fix in 3C.

At this time, the outer frame 6A of the filter element 6 made of the wire mesh material 8 is
The filter element 6 can be firmly fixed to the opening end 3B of the cylindrical portion 3 via the respective caulked portions 3D by being caulked and fixed so as to be melted around the metal wire of A (edge portion 8B). Filter element 6
And the reliability can be improved.

Further, the outer frame 6 of the filter element 6
Since the A and the mesh portion 6B are formed only by a single wire mesh material 8, there is no need to configure the filter element 6 with two members as in the prior art, so that the number of parts is reduced and the filter element 6 is easily formed. Can be done.

The wire mesh material 8 has a thick rim 8B.
When the (outer frame portion 6A) is formed, the pressing force is prevented from being applied to the inner flat portion 8C (mesh portion 6B) as described above. Housing 2
The flow of the intake air flowing through the cylindrical portion 3 can be stabilized by the filter element 6, and the detection accuracy of the air flow rate by the detecting portion 5 can be favorably maintained for a long time.

Therefore, according to the present embodiment, the wire mesh material 8 is formed in a circular shape from the wire mesh material 7 and the bent portion 8A is formed on the outer edge side of the wire mesh material 8, and then the bent portion 8A is formed.
By vertically compressing and deforming so as to buckle, the thick rim 8B on the outer edge side of the wire mesh material 8 can be automatically shaped, and the shaping, bending and framing steps shown in FIG. It can be performed by one continuous pressing operation.

The reinforcing edge 8B can be formed on the outer edge side of the wire mesh material 8 by a single pressing operation.
B can be easily formed, and the filter element 6 of the flow rate detecting device 1 can be formed only of the wire mesh material 8, and sufficient rigidity can be secured by the rim portion 8B.

In the above embodiment, the shaping, bending, and edging steps of the wire mesh material 8 are performed by a single pressing operation using the shaping machine 11, but the present invention is not limited to this. The present invention is not limited to this. For example, after forming the wire mesh material 8 in a separate process from the wire mesh material 7 shown in FIG. 10, while forming the bent portion 8 </ b> A on the outer edge side of the wire mesh material 8 using the shaping machine 11. Alternatively, the bent portion 8A may be buckled to form a thick rim portion 8B. In this case, the shaping die 23 and the like of the shaping machine 11 may be omitted.

In the above embodiment, the circular wire mesh material 8 is cut from the wire mesh material 7. However, the present invention is not limited to this. For example, the wire mesh material to be processed may be an ellipse or a square. It is good also as a structure which shapes in the planar shape of this.

Further, in the above-described embodiment, the case where the wire mesh material 8 is used as the filter element 6 of the flow rate detecting device 1 has been described as an example. However, the present invention is not limited to this. The present invention may be applied to a gas filter element for removing water, a liquid filter element for removing foreign matter from a liquid such as hydraulic oil, or the like.

[0063]

As described in detail above, according to the first aspect of the present invention, after the wire mesh material is formed into a predetermined planar shape in the shaping process, the outer edge of the wire mesh material is bent in the bending process. The wire mesh material is bent substantially vertically to form a bent portion, and in a subsequent edging step, the bent portion of the wire mesh material is vertically compressed and deformed so as to buckle, and a thick rim is formed on the outer edge side of the wire mesh material. Since the edge portion is formed, a reinforcing edge portion can be formed on the outer edge side of the wire mesh material by a single press operation, and the edge portion can be easily shaped, and the bending step and the edge portion can be formed. The process can be performed by continuous press work, and the workability during shaping can be greatly improved.

According to the second aspect of the present invention, the wire mesh material is sandwiched between the lower mold and the upper mold, and the thick mesh portion is formed on the outer edge side of the wire mesh material. For molding, a movable base having an upper end surface serving as a supporting surface of a wire mesh material is provided in the lower fixed cylinder, and the movable base is constantly urged toward the ascending position by the first urging means. The upper die has a cylindrical bending punch having a pressing surface for bending the outer edge side of the wire mesh material downward between the outer periphery of the support surface of the movable table, and a lower end surface supporting the movable table. And a second urging means for urging the pressing punch downward with an urging force smaller than that of the first urging means. Since the wire mesh material is placed on the lower movable table (bearing surface), for example, By driving toward the body in the lower mold, it can be automatically formed to the bent portion to the outer edge side of the wire mesh material between the pressing surface and the bearing surface outer periphery of the movable table folding punch.

Further, the bent portion can be vertically compressed and deformed so as to buckle between the outer peripheral side of the pressing surface of the pressing punch and the receiving portion of the fixed cylinder. It can be shaped as a border. Therefore,
A rim for reinforcement can be formed on the outer edge side of the wire mesh material by a single press work, and the shaping of the rim can be easily performed, for example, a filter element or the like can be formed only of the wire mesh material, Sufficient rigidity can be given to the filter element and the like by the rim.

In the third aspect of the present invention, a shaping die is provided in the lower die, and the wire mesh material is shaped in a circular shape between the shaping die and the bending punch. A state in which the wire mesh material is sandwiched between the pressing surface of the pressing punch and the supporting surface of the movable base when the entire upper mold is driven toward the lower mold while the wire mesh material is placed on the support surface of the movable base. In this way, the wire mesh material can be shaped to an outer diameter corresponding to the inner diameter of the shaping die, and the outer peripheral side of the wire mesh material is bent downward by the pressing surface of the bending punch between the outer peripheral side of the movable table and the outer periphery of the movable table. The shaping, bending, and edging steps of the wire mesh material can be performed by one continuous pressing operation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a flow rate detection device using a wire mesh material as a filter element according to an embodiment of the present invention.

FIG. 2 is a front view of the flow detection device shown in FIG.

FIG. 3 shows an arrow in FIG. 2 showing a filter element and the like.
It is the expanded sectional view seen from the -III direction.

FIG. 4 is a plan view showing the entire shaping machine for shaping a rim on the outer edge side of the wire mesh material.

FIG. 5 is a cross-sectional view showing the shaping machine as viewed from a direction indicated by arrows VV in FIG. 4;

FIG. 6 is a cross-sectional view similar to FIG. 5, showing a state in which the upper die is pressed down to the bending position of the wire mesh material.

FIG. 7 is a cross-sectional view similar to FIG. 5, showing a state in which the upper die has been pressed down to the trimming position of the wire mesh material.

FIG. 8 is an enlarged sectional view showing a main part in FIG. 6;

FIG. 9 is an enlarged sectional view showing a main part in FIG. 7;

FIG. 10 is a perspective view showing a state where a wire mesh material is formed from a wire mesh material.

FIG. 11 is a cross-sectional view showing a shaping step, a bending step, and a trimming step of the wire mesh material.

[Explanation of symbols]

 Reference Signs List 6 Filter element 7 Wire mesh material 8 Wire mesh material 8A Bent portion 8B Edge portion 11 Shaping machine (edge portion shaping device) 12 Lower die 13 Upper die 14 Lower die plate 15 Die holder 17 Crash ring (fixed cylinder) 18 Work holder (movable) 19) Supporting spring (first biasing means) 21 Extrusion pin 23 Shaping die 24 Upper die plate 26 Pressing ring 28 Bending punch 28A Pressing surface 29 Pressing punch 29C Pressing surface 30 Holding spring (second biasing means) ) 32 Mounting shaft

Claims (3)

[Claims] 1. A shaping step of shaping a wire mesh material into a predetermined planar shape, and forming a bent portion on an outer edge side of the shaped wire mesh material, thereby forming an outer edge of the wire mesh material substantially. A wire mesh comprising: a bending step of bending vertically; and a bordering step of vertically compressing and deforming the bent portion of the wire mesh material so as to buckle to form a thick border portion on the outer edge side of the wire mesh material. How to shape the edge of the material. 2. A lower mold for supporting a wire mesh material from below, and an upper mold for molding a thick rim on the outer edge of the wire mesh material while holding the wire mesh material between the lower mold. The lower die is formed in a stepped cylindrical shape and has a thin receiving portion on the upper end side, and is provided in the fixed cylinder so as to be movable up and down and above the receiving portion of the fixed cylinder. A movable table having an upper end surface protruding from the upper surface serving as a bearing surface of a wire mesh material; and a first support for constantly biasing the movable table toward the ascending position to allow the movable table to be displaced from the ascending position to the descending position. The upper die is formed in a stepped cylindrical shape having an inner diameter corresponding to an outer periphery of a receiving portion of the fixed cylinder, and a lower end of the upper die is provided between the outer periphery of the supporting surface of the movable base and the outer periphery of the wire mesh material. A cylindrical bending punch with a pressurized surface that bends the edge side downward, and is provided in the bending punch so that it can move up and down A pressing punch having a lower end surface serving as a pressing surface for holding the wire mesh material between the supporting surface of the movable platform and a pressing force lower than the first pressing means; And a second urging means for allowing the pressing punch to move up and down with respect to the bending punch. 3. The lower die is formed in a ring shape with an inner diameter corresponding to the outer periphery of the pressing surface of the bending punch, and the wire mesh material is formed in a circular shape between the lower die and the bending punch. 3. The apparatus according to claim 2, further comprising a die.