JP2714752B2 - Method for caulking orthogonal plate material and method for assembling fan casing using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for caulking an orthogonal plate material, that is, a method for caulking a plate material and a plate material which is in contact with the periphery of the plate material at right angles. The invention relates to a caulking method in which a rectangular tongue piece is caulked into a rectangular mounting hole formed in the other plate material. The present invention also relates to a method for assembling a fan casing using this method.

[0002]

2. Description of the Related Art As shown in FIGS. 1 to 3, a fan casing for an air supply fan or the like is composed of a pair of side plates (1a) and (1b) having mutually symmetric outer shapes, and a band-shaped body connecting between the side plates. (2a). Rectangular tongue pieces (21) (21) for caulking are arranged at a predetermined pitch at the edge of the body plate (2a), and the other side plates (1a) (1
In b), caulking holes (11) (11) corresponding to the tongue pieces (21) (21) are formed near the outer peripheral edge. When assembling the fan casing, as shown in FIG.
Insert the tongue pieces (21) and (21) into the caulking holes (11) and (11) so that the side plates (1a) and (1b) are perpendicular to the
1) A pair of crimping blades (31) (31) having a mountain-shaped cross section of a crimping type (3) are vertically struck against the end surfaces of the tongue pieces (21) and (21) from (11). . Then, as shown in FIGS. 5 and 6, the press-down recesses (23) and (23) are formed at positions corresponding to the swaging blade portions (31) and (31) of the tongue piece (21), and the tongue piece (21) is formed. The side caulking pieces (24) and (24) protrude in the plate thickness direction, and the end caulking pieces (22) and (22) are expanded in the longitudinal direction of the tongue piece (21). ) (24) and end caulking pieces (22) (22) and caulking holes
The periphery of (11) is engaged. That is, the side plate (1a) (1b) and the body plate (2a) are caulked by plastically deforming the protruding portion of the tongue piece (21) from the caulking hole (11).
It is assembled in a fan casing like the one described above. This has the advantage that the fan casing can be assembled without using mounting parts such as screws.

However, in this case, the tongue piece (21)
There is a problem that the crimping strength with the peripheral portion of the crimping hole (11) is insufficient. This is for the following reason. Recently, the thickness of the plate member constituting the fan casing has been reduced due to demands for cost reduction and weight reduction. Therefore, the tongue piece (21) has a weak waist. Also, the swaging hole (11) into which the tongue piece (21) is inserted has a narrow width corresponding to the small thickness of the tongue piece (21).

[0004] The caulking hole (11) is formed by punching using a mold. However, since it is difficult to machine a narrow width hole due to a problem such as the strength of the mold, the dimensional accuracy of the caulking hole (11) is sufficient. It does not become something. Therefore, in the case of the fan casing, it is necessary to provide a sufficient fitting allowance between the two sets of the caulking hole (11) and the tongue piece (21) in order to ensure the fitting. is there.

On the other hand, since the tongue piece (21) is thin and the waist is weak, the caulking mold (3) is used to drive the end caulking pieces (22) and (22), so that the crimping strength is insufficient and the side part is weakened. The amount of protrusion of the swaging pieces (24) and (24) is also small. Therefore,
These end crimping pieces (22) (22) and side crimping pieces (24) (24)
Therefore, the degree of engagement with the periphery of the caulking hole (11) is not sufficient, and the caulking strength between the side plates (1a) (1b) and the body plate (2a) is insufficient.

[Problem] The present invention has been made in view of the above point, and is based on a method of caulking by attaching one of the plate materials (2) to the other mounting plate (1) in an orthogonal state. Then, the plate material is inserted into the caulking hole (11) provided in the mounting plate (1).
Insert the tongue piece (21) protruding from the edge of (2) and crimp the blade of the crimping type (3) against the protruding end face of the tongue piece (21) from the attached plate (1). Part (31) in the vertical direction, the projecting portion of the tongue piece (21) is plastically deformed to caulk an orthogonal plate material '', the thin plate material (2) and the attached plate ( Even in the case of 1), it is an object of the present invention to crimp the tongue piece (21) and the periphery of the crimping hole (11) with sufficient strength.

[0007]

The technical means of the present invention for solving the above-mentioned problem is as follows: "The direction in which the cutting edge of the caulking blade portion (31) is continuous extends in a plane parallel to the end face of the protruding portion. The crimping blade (31) is struck in an oblique direction with respect to the plate thickness direction to form a pressing recess (23) on the end face of the projecting portion of the tongue piece (31). "

[0008]

The above technical means operates as follows. In order to caulk the other mounting plate (1) with respect to the one plate material (2), a caulking mold (3) is formed on the protruding end face of the tongue piece (21) from the mounting plate (1). Is crimped in the vertical direction. At this time, this caulking blade (3
The posture of the tongue piece (21) in 1) is such that the direction in which the cutting edge of the swaging blade part (31) is continuous is oblique to the thickness direction of the tongue piece (21) in a plane parallel to the end face of the protruding part. Direction is set. Then, on the end face of the protruding portion of the tongue piece (21), a depression (23) is formed which is oblique to the thickness direction thereof.

A crimping piece is formed on both sides of the tongue piece (21) with the pressing recess (23) interposed therebetween.
In the forming process, the portion corresponding to the caulking piece is bent obliquely outward by the caulking blade portion (31) to form the final caulking piece. That is, the caulking piece equivalent portion is twisted by the driving force of the caulking blade portion (31) to form a caulking piece. And these caulking pieces and caulking holes (11)
The plate (2) and the attached plate (1) are caulked by the engagement with the peripheral edge of the plate.

The deformation of the caulking piece due to the torsion action is greater than the deformation of the caulking piece by the conventional method in which the caulking piece is bent only in the longitudinal direction of the tongue piece (21). The degree of engagement with the hole (11) is larger than that of the conventional one. At the same time, the pressing recess (2
Needless to say, the side caulking pieces similar to the conventional one protrude from both ends of 3), and these side caulking pieces also exhibit caulking strength.

[0011]

[Effect] The degree of deformation of the swaging piece formed at both ends in the longitudinal direction of the tongue piece (21) is larger than that of the conventional one, that is, the degree of engagement between the swaging piece and the swaging hole (11) is also increased. As a result, the crimping strength between the plate (2) and the plate (1) to be mounted is improved as compared with the conventional one.

Therefore, the thin plate to be mounted (2) and the plate material
(1) It can be used for mutual caulking.

[0013]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. The embodiment shown in FIGS. 7 to 11 is an embodiment in which the present invention is applied to a fan casing of an air supply fan. This embodiment has a pair of side plates (1a ) (1b) and a band-shaped shell plate (2a) connecting them
(See FIGS. 1 and 2). The trunk plate (2a) is formed in a belt-like body in which only the bent portion (K) near the outlet of the air supply fan is bent in advance to the final finished shape, as indicated by the imaginary line in FIG. I have. In this embodiment, the side plates (1a) (1b) have a thickness of about 0.8 mm, and the body plate (2
The thickness of a) is set to about 0.8 mm.

[About the swaging hole (11) and the tongue piece (21)] Rectangular tongue pieces (21) and (21) for swaging are arranged at a predetermined pitch at the edge of the body plate (2a). The other side plate (1a) (1b) has a caulking hole (11) near the outer peripheral edge thereof corresponding to the tongue pieces (21) (21).
(11) is drilled. In this embodiment, the tongue piece is
The protrusion length of (21) is about 0.8 mm, and its longitudinal dimension is about 7 mm. As shown in FIG. 10, the fitting allowance between the swaging hole (11) and the tongue piece (21) is , Its longitudinal margin (δ) is set to 0.2 mm, and its width margin (ε) is set to 0.1 mm.

The side plates (1a) and (1b) and the body plate (2a)
The caulking mold (3) for caulking is provided with a pair of caulking blades (31) and (31). The caulking blades (31) and (31) are as shown in FIGS. 8 and 9. In addition, the tongue piece (21) has a chevron-shaped cross-section that extends obliquely in a straight line from one side in the longitudinal direction to the other side opposite to the tongue. The caulking blade (31)
The inclination angle of the direction in which the cutting edge of (31) is continuous is the tongue piece (2).
15 ° to 75 ° (45 ° in this embodiment) in a plane parallel to the end face of the protruding portion of the tongue piece (21) with respect to the thickness direction of 1).
Degree), and the distance (L) between one end of the pressing recess (23) formed in the tongue piece (21) and the longitudinal end of the tongue piece (21) is determined by the tongue piece (21). ) Is set to about twice to three times the plate thickness (see FIG. 10).

When assembling the fan casing, first, one side plate (1a) is attached to the body plate (2a) in an orthogonal state, and the tongue piece (K) on the bent portion (K) side of the body plate (2a) is attached. By inserting the body plate (2a) into the shape of the periphery of the side plate (1a) by inserting the body plate (2a) into the caulking hole (11) in order from 21), the body plate (2a) and the side plate are formed.
(1a) is temporarily assembled. Then, the caulking hole of the other side plate (1b)
(11) Insert the tongue pieces (21) and (21) into (11) and temporarily assemble the side plate (1b) to complete a temporary assembly of the entire fan casing. Then, as shown in FIG. 7, the caulking table (T) provided with a concave portion capable of accommodating the protruding portion of the tongue pieces (21) (21) protruding from the caulking holes (11) (11). The assembled fan casing is placed, and a caulking mold (3) is attached to each of the protrusions by the side plates (1a) (1).
b) When the surface of the tongue piece (21) coincides with the caulking blades (31) and (31) is plastically deformed as shown by the imaginary line in FIG. (23) is formed. At this time, the disposition posture of the caulking blades (31) and (31) is set obliquely with respect to the thickness direction of the tongue piece (21), and the cross-sectional shape is an angled cross-section. Recess (23)
(23) is formed in a V-shaped cross section so as to run obliquely.

At this time, the width (W) of the pressing recesses (23) (23) is about 1.5 times the plate thickness (t) of the tongue piece (21) and the depth thereof is about 0.5 mm of the plate thickness. The cross-sectional shape of the swaging blades (31) and (31) and the driving pressure of the swaging die (3) are set to predetermined values so as to be about eight times. Then, both ends of the tongue piece (21) are bent obliquely outward by the pressing force from the caulking blades (31) and (31), and the end caulking pieces (22) and (22) are formed at this portion. At the same time, the side caulking pieces (2
4) (24) protrudes. On the other hand, the pressing force acts as a bending force on both ends of the intermediate member (25) between the depressions (23) and (23) in the tongue piece (21). Since the directions of the bending forces are opposite to each other with respect to the longitudinal direction of the tongue piece (21), they act as a couple on the intermediate member (25).
Accordingly, both side portions of the intermediate member (25) protrude outward in the width direction of the caulking hole (11), and this protruding portion forms the intermediate caulking piece (25).
a) It will function as (25a). By these, the side caulking pieces (24) (24), end caulking pieces (22) (22), intermediate caulking pieces (25a) (25a), and the periphery of the caulking hole (11) are engaged, The fan casing will be assembled.

The caulking blades 31 of the caulking mold 3 may be formed so as to have a "C" shape. In this case, by the same caulking as in the above embodiment, as shown in FIG. 11, the intermediate member (2
A bending force in the same direction acts on both ends of 5), whereby the intermediate member (25) is bent and protrudes outside the caulking hole (11), and also in this case, the intermediate member (25) is Swaging piece (25
a) will function.

In the above-described embodiment, the two tongue recesses (23) are formed in the tongue piece (21).
A depression portion (23) may be formed at a location.

[Brief description of the drawings]

FIG. 1 is a plan view of a fan casing.

FIG. 2 is a side view of this.

FIG. 3 is an explanatory view of a conventional example in a state where a tongue piece (21) is inserted into a caulking hole (11).

Fig. 4 Side plate (1a) (1b) and body plate of conventional caulking die (3)
Explanatory drawing of the state before caulking (2a)

FIG. 5 is a plan view showing a state after the caulking.

FIG. 6 is a side view of this.

FIG. 7 is an explanatory view of the embodiment of the present invention in a state where the temporarily assembled fan casing is mounted on a caulking stand (T).

FIG. 8 is an explanatory view of a face to which a crimping die (3) according to an embodiment of the present invention is applied;

FIG. 9 is a side plate (1a) (1) of a caulking mold (3) according to the embodiment of the present invention.
Explanatory drawing of a state before caulking b) and body plate (2a)

FIG. 10 is an explanatory diagram of a state after the caulking thereof.

FIG. 11 is an explanatory diagram of a state after caulking when the caulking blades (31) and (31) are formed in a “C” shape.

[Explanation of symbols]

 (1) ... Plate to be attached (2) ... Plate (21) ... Tongue piece (23) ... Depressed recess (3) ... Crimping type (31) ... Crimping blade

Claims (2)

(57) [Claims] 1. A method for crimping one plate member (2) with the other attached plate (1) in an orthogonal state, comprising a crimping hole (11) provided in the attached plate (1). A tongue piece (21) protruding from the edge of the plate (2) is inserted into the crimping mold (3) with respect to the end face of the protrusion of the tongue piece (21) from the attached plate (1). ) Crimping blade (31)
In a method of caulking an orthogonal plate material in which the protruding portion of the tongue piece (21) is plastically deformed by caulking in the vertical direction, the direction in which the cutting edge of the caulking blade portion (31) is continuous is defined by the protruding portion. The caulking blade portion (31) is struck in a position oblique to the thickness direction of the tongue piece (21) in a plane parallel to the end face, and a pressing-down concave portion (31) is formed on the protruding end face of the tongue piece (31). 23) A method for crimping an orthogonal plate material, wherein 2. A method of assembling a fan casing using the caulking method according to claim 1, wherein the attached plate (1) is a pair of side plates (1a) (1b) constituting the fan casing, A body plate (2) connecting the plate material (2) between the side plates (1a) (1b).
a) How to assemble the fan casing.