JP2001179366A - Clamping method for plate member and clamping device for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the exact clamping of a second plate member especially among two and more members securing a big clamping strength, even if the clamping process is conducted in a narrow and limited domain. SOLUTION: After a peripheral part of a processing hole 1A of a first plate member 1 is expanded and hugged to a clamping hole of a second plate member 2 at a straight part 5A of a punch 5, an expanded part 5B is pushed into the further outer peripheral part of the processing hole 1A. The outer peripheral part of the processing hole 1A to which the expanded part 5B of the first plate member 1 is pushed in is bent. The bent part is hugged to an internal periphery of the clamping holes 2A, 3A of the second plate members 2, 3. Then the first plate member 1 and the second plate member, at least not less than one members 2, 3 are unitedly clamped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening method for a plate-like member for integrally fastening a plurality of plate-like members in a superposed state, and a fastening device used for the fastening method.

[0002]

2. Description of the Related Art For example, as a method of integrally fastening two plate-like members in a state where they are superposed on each other, see Japanese Patent Application Laid-Open No. 5-1.
A method using a burring process as described in JP-A-61930 and JP-A-11-179452 is known.

Normally, such a fastening method is, as described in the above-mentioned publication, for example, in FIG. 6, two metal plate-like members having an opened hole, that is, a first fastening member. The second plate member 101 to be fastened and the second plate member 101 to be fastened are overlapped, and a processing hole 100A of the first plate member 100 is pierced by a punch 102 with a pressing means such as a press machine (not shown).
As a result, the periphery of the processing hole 100A is bent, and the bent portion is connected to the fastening hole 101A of the second plate-like member 101.
The first plate-shaped member 100 and the second plate-shaped member 101 are integrally fixed and fastened.

[0004]

In this fastening method, the amount of a portion (hereinafter referred to as a bent portion) to be processed for the first plate-like member 100 in order to secure a reliable fastening state. Is preferably ensured as much as possible.
That is, the larger the amount of the bent portion, the more the punch 102
Δ (hereinafter, referred to as a gap Δ) between the outer diameter X of the second plate member 101 and the inner diameter Y of the fastening hole 101A of the second plate-shaped member 101, that is, the gap Δ =
This is because Y-X can be secured large (thick).

[0005] However, there are cases where the area to be bent is necessarily narrowed due to, for example, the installation space of the mounted components. In this case, an outer diameter of the punch 102 is naturally small. On the other hand, regarding the processing hole 100A of the first plate-shaped member 100, the minimum value of the inner diameter is limited, and a certain size is required. For this reason,
It is difficult to secure a large area between the outer periphery of the punch 102 and the inner periphery of the processing hole 100A, that is, the bent portion δ (see FIG. 6).

As a result, the following inconveniences occur. When the amount δ of the bent portion is small, the bent portion of the first plate-shaped member 100 is thinned and easily torn during the processing, and there is a possibility that the processing is difficult or the processing cannot be performed. In particular, in the region where the space is limited, for example, if a large bent portion is secured, the gap Δ is reduced, and conversely, the ironing rate (the thickness of the straight portion with respect to the first plate-shaped member 100 is small). Causes the same inconvenience. Further, when the plurality of second plate-like members 101 are fastened to the first plate-like member 100, if the gap Δ is small,
A fastening strength against pull-out force for separating the second plate-like members 101 or lateral shearing force cannot be obtained. Further, for example, when using a thick second fastening member 101 or fastening two or more second plate members 101 to the first plate member 100, the amount of bent portions is insufficient. , The fastening hole 10 of the second plate-shaped member 101
There is also a problem that it is not possible to cover and process the entire 1A, and there is a possibility that the fastening can be performed only halfway.

In view of the above-mentioned circumstances, the invention according to claim 1 or 9 has, for example, not only the fact that the bent portion is not thinned and torn and the processing is not difficult, but also the limited narrow portion. It is an object of the present invention to secure a large fastening strength even in the case of performing a fastening process in a region, and particularly to enable secure fastening even with two or more second plate-shaped members.

Another object of the present invention is to enable a smooth fastening operation to be performed during machining.

It is another object of the present invention to prevent the bent portion of the first plate-like member from being torn at the time of processing and to perform a smooth fastening operation. .

A fifth object of the present invention is to enable the innermost second plate member to be fastened to the first plate member without play.

[0011] It is an object of the invention according to claim 6 to provide a more reliable fastening method that can increase the fastening strength and maintain a more reliable fastening state.

An object of the invention according to claim 7 is to enable not only fastening but also cushioning properties to be provided.

The invention according to claim 8 or 10 can maintain a high fastening state for a long period of time with a stronger fastening force, and can realize a more reliable one.

[0014]

Therefore, in the fastening method according to the first aspect, a first plate-like member for fastening and a second plate-like member for fastening are overlapped, and the second plate is provided. A part of the first plate-shaped member is bent by punching a portion corresponding to the fastening hole of the plate-shaped member with a punch, and the bent portion is held by a hole edge of the fastening hole. In the fastening method of the plate-shaped member for fastening the second plate-shaped member, the inner diameter of the bent portion is made uniform at the straight portion at the tip of the punch, while the inner diameter of the bent portion is larger than the straight portion, and at the base of the straight portion. The formed enlarged portion cuts into the first plate-shaped member, and the cut portion is also bent.

According to a second aspect of the present invention, in the first aspect of the present invention, when the first plate-like member and the second plate-like member are overlapped with each other, A hole for burring is formed in a portion corresponding to the fastening hole of the second plate-shaped member.

The invention according to claim 3 is the invention according to claim 1 or 2
In the invention described in (1), the first plate-shaped member is provided with the second
And a plurality of the plate-like members are overlapped and fastened.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the second innermost superimposed one of the plurality of fastening holes of the second plate-shaped member is the innermost one. The hole diameter of the fastening hole of the plate member is formed to be the largest.

According to a fifth aspect of the present invention, in the third aspect of the present invention, a chamfer is provided on a side of the first plate-like member of a fastening hole of the second plate-like member superposed on the innermost side. Or it is obtained by performing a curved surface processing.

According to a sixth aspect of the present invention, in the third aspect of the present invention, the openings of the fastening holes of the plurality of second plate-like members are chamfered or curved. Things.

According to a seventh aspect of the present invention, in the third aspect of the present invention, the second plate-like member provided inside is formed of an elastic material.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the bent portion protrudes from the hole edge of the fastening hole after the bent portion is held by the hole edge of the fastening hole. Is folded back outward.

According to a ninth aspect of the present invention, there is provided the plate-like member fastening device,
The first plate-like member for fastening and the second plate-like member for fastening are overlapped, and a portion corresponding to the fastening hole of the second plate-like member is punched with a punch to form the first plate-like member. In the plate member fastening device, a part of the member is bent, the bent portion is held by a hole edge of the fastening hole, and the second plate member is fastened to the first plate member. A straight portion having a uniform inner diameter of the bent portion, and an enlarged portion having a diameter larger than that of the straight portion, formed at the base of the straight portion, bite into the first plate-like member, and bend this portion. It is provided.

According to a tenth aspect of the present invention, in the invention according to the ninth aspect, the bent portion protrudes from the hole edge of the fastening hole after the bent portion is held by the hole edge of the fastening hole. And an ejector which is turned back outward from the punch.

[0024]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a fastening device for a plate-shaped member according to the present invention. The fastening device includes an upper die A disposed on the upper side, a lower die B disposed immediately below the upper die A,
A first plate-like member 1 and a second plate-like member 1 to be integrally fastened between the upper and lower molds.
The plate-like members 2 and 3 have holes 1A,
The layers are stacked such that the central axes of 2A and 3A coincide.

The first plate-like member 1 is made of a metal plate, for example, a drawing material having better drawing characteristics than a general material, and
ECE material (Electro galvanized steel sheet, drawn type) or SP
Using a CE material (cold rolled steel plate) or the like, a perfect circular processing hole 1A smaller than the fastening holes 2A, 3A of the second plate members 2, 3 is opened. In general, the first plate-like member 1 of this example is likely to break if the inner diameter is not larger than the plate thickness. Therefore, the first plate-shaped member 1 has a margin of 0.2 mm, the plate thickness is 1.6 mm, and the inner diameter of the processing hole. Is 1.8 mm.

An upper second plate-like member 2 (corresponding to the innermost second plate-like member in the present invention) in contact with the first plate-like member 1 has a lower second plate-like member. A fastening hole 2A having an opening (inner diameter D2) larger than the fastening hole 3A of the member 3 (corresponding to the outermost second plate-shaped member in the present invention) is formed. The upper second plate-like member 2 includes:
The edges of the opening portions opened above and below the fastening hole 2A are each subjected to a curved surface processing (hereinafter, referred to as R processing) (or may be chamfered) having a substantially circular arc cross section.

When at least two or more second plate-like members 2 and 3 are fastened as in this example, the upper and lower openings of the fastening holes 2A of the innermost second plate-like member are used. It is sufficient that the processing is performed only on the edge 2C at least in the upper opening, and the processing is not particularly required on the edge in the lower opening.

The lower second plate-like member 3 has an edge portion of an opening portion opened above and below the fastening hole 3A.
Edge 3D of upper opening except for edge 3C of lower opening
Are subjected to R processing (or chamfering may be performed). Note that, in this example, these second plate members 2, 3
Uses a normal SECC material (electrogalvanized steel sheet, general type).

The upper die A includes a first guide member 4 fixed in an immovable state at the time of fastening processing, and a punch 5 that moves forward and backward along a guide hole 4A provided in the guide member 4.

The punch 5 has an outer diameter smaller than the inner diameter (D2) of the fastening hole 2A of the upper second plate-shaped member 2 and larger than the inner diameter (D1) of the processed hole 1A of the first plate-shaped member 1. Diameter (D
5) Straight portion 5A having a straight outer periphery in 5)
And the inner diameter (D5) of the fastening hole 2A of the upper second plate-like member 2 which is larger than the outer diameter (D5) of the straight portion 5A.
And an enlarged portion 5B having an outer diameter (D5 ') smaller than 2).

In particular, the enlarged portion 5B is provided with a step-shaped stepped portion whose peripheral edge forms a right angle and protrudes one step from the straight portion 5A, and a peripheral portion of the processing hole 1A of the first plate-shaped member 1. Among them, particularly, a portion which is bent by the straight portion 5A is further cut into an outer portion to be bent. As a result, a larger volume of the portion to be subjected to the fastening process, that is, the bent portion can be ensured. Therefore, the bent portion bent deeper and deeper from the fastening hole 2A of the upper second plate-shaped member 2 becomes the lower portion. Second
The tabular member 3 is held and filled so as to cover the inner peripheral surface of the fastening hole 3A.

On the other hand, the lower die B is provided with a second guide member 6 provided in a stationary state, and a front-rear direction along a guide hole 6A provided in the second guide member 6 so as to face the punch 5 of the upper die A. And an ejector 7 that moves forward and backward.

The ejector 7 moves the bent portion 1B (see FIG. 3) protruding from the lower second plate-like member 3 by the upward moving operation of the pressing means to the lower second plate-like member 3. The outer surface 3B is folded back.

The pressing means is for pushing the punch 5 and the ejector 7 toward the first plate-like member 1 and the second plate-like members 2, 3 with a strong force. In this example, Each press is used.

Next, a method for fastening a plate-like member according to the present invention using the fastening device of the above example will be described. at first,
The first plate-shaped member 1 is opened through the processing hole 1A, and the second plate-shaped members 2, 3 are opened with fastening holes 2A, 3A. The inner diameters of these holes are as shown in FIG.
The fastening holes 2A (inner diameter D2) of the upper second plate-like member 2, the fastening holes 3A (inner diameter D3) of the lower second plate-like member 3, and the first plate-like member 1 are arranged in this order from the larger one. Processing hole 1A
(Inner diameter D1), and is formed in a magnitude relation of D1 <D3 <D2.

Next, as shown in FIG. 1, the first plate-like member 1 and the second plate-like members 2, 3 are aligned and laminated so that the central axes C of the respective holes coincide with each other. In addition, each fastening hole 2
A, 3A, the edge of the opening (the lower second
(Except the edge of the lower opening portion of the plate-shaped member 3) is rounded or chamfered, so that the center axis C of each of these holes and the center axis C of the straight portion 5A of the punch 5 are centered. It is preferable that the axes match as much as possible,
It may be slightly shifted. This is because the edge of the opening portion of each hole is rounded or chamfered, so that the processed edge of the second plate-shaped member 2, 3 that contacts the outer surface of the straight portion 5A of the punch 5 This is because the lower surface of the straight portion 5A appropriately moves along the radial direction of the hole in the direction of absorbing the displacement by the lowering operation of the straight portion 5A, and the center axis naturally matches. However, in order to perform such self-correction, it is necessary to reduce the clamping force between the upper and lower dies A and B to some extent.

The first plate-like member 1 and the second plate-like members 2, 3, which have been aligned and laminated, are fixed by a first guide member 4 and a second guide member 6 which are guide fixing means. Hold it from both upper and lower sides and fix.

Thus, a straight portion 5A having a smaller diameter than the fastening holes 2A, 3A of the second plate-like members 2, 3 and a larger diameter than the processing hole 1A of the first plate-like member 1, A punch 5 having a larger diameter than step 5A and having a step-shaped stepped enlarged portion 5B is arranged in a state facing directly above processing hole 1A of first plate-shaped member 1.

Next, the punch 5 is inserted into the guide hole 4A using a press machine.
, And the straight portion 5A is inserted into the processing hole 1A and pushed. As a result, the peripheral portion of the processing hole 1A of the first plate-shaped member 1 is bent, and starts to be held on the inner wall surface of the fastening hole 2A. That is, when the portion pressed against the straight portion 5A in the peripheral portion of the processing hole 1A of the first plate-shaped member 1 comes into contact with the edge of the upper opening portion of the upper second plate-shaped member 2, The bending stress is maximized, and further lowering of the punch 5 causes plastic deformation around the processing hole 1A into which the straight portion 5A is pushed. Then, the plastically deformed portion of the first plate member 1, that is, the bent portion, is formed between the outer peripheral surface of the straight portion 5A of the punch 5 and the inner wall surfaces of the fastening holes 2A, 3A of the second plate members 2, 3. Squeezed,
It is pushed down.

As a result, as shown in FIG. 2, the edge 2E of the lower opening portion of the fastening hole 2A of the upper second plate-like member 2,
A space near the edge 3D of the upper opening of the fastening hole 3A of the lower second plate-shaped member 3 is filled with a bent portion deformed in accordance with this shape. Note that up to this point, the bent portion has not reached the lower opening portion of the lower second plate-shaped member 3. In other words, the bent portion has insufficient capacity to penetrate through the fastening hole 3A of the lower second plate member 3 and protrude to the outside. Cannot be fastened. That is, in this state, the fastening operation stops in the middle of the fastening hole 3A.

Here, the lowering operation of the punch 5 by the press machine further causes the enlarged portion 5B to bite into the peripheral portion of the processing hole 1A of the first plate-like member 1, as shown in FIG. The bent part also bends and moves downward.

That is, when the enlarged portion 5B of the punch 5 is further pushed into the peripheral edge of the processing hole 1A of the first plate-like member 1 by a press machine, as shown in FIG.
The original bent portion is further pushed downward by the amount of the volume of the portion where B has bitten. Thereby, the original bent portion extruded into the fastening hole 3 </ b> A becomes the second plate-shaped member 2,
3 are tightly held on the inner peripheral surfaces of the fastening holes 2A and 3A, and are pressed down further to move downward from the fastening holes 3A. Then, the tip of the original bent portion that has passed through the fastening hole 3A of the lower second plate-shaped member 3 and moved downward and outward changes its course from the lower side to the side, and It goes around the lower surface side of the shaped member 3.

Thereafter, as shown in FIG. 4, the punch 5 rises and retreats, and the ejector 7
Is raised while being guided by the guide hole 6A of the second guide member 6, and the upper part of the ejector 7 presses the bent portion projecting downward from the lower second plate-shaped member 3, so that the ejected part is protruded. The bent portion is the lower second plate-like member 3.
Folded back to the outer surface of the Thereby, as shown in FIG. 5, the first plate-like member 1 and the second plate-like members 2, 3 are integrally fastened with a strong fastening force.

[0044]

As described above, according to the present invention, not only the straight portion but also the first plate-like member can be processed by the enlarged portion provided at the base of the straight portion at the tip of the punch. It is designed to further bite into the peripheral portion of the hole, and a larger amount of bent portion is formed on the inner peripheral surface of the fastening hole of the second plate-like member by the amount of the enlarged portion as compared with the conventional fastening method. Because it can be hugged, for example, the bent portion becomes thin and does not break or becomes difficult to process, and the first and second plate members are firmly and reliably connected. Fastening can be performed integrally, and a strong fastening strength can be obtained. In particular, two or more second plate members can be securely and integrally fastened to the first plate member.

Further, according to the second aspect of the present invention, when the first plate-like member and the second plate-like member are overlapped,
A processing hole for burring is formed in a portion of the first plate-shaped member corresponding to the fastening hole of the second plate-shaped member, and the straight portion of the punch penetrates while being guided along the hole. Therefore, smooth fastening processing can be realized.

Further, according to the fourth aspect of the present invention, of the diameters of the fastening holes of the plurality of superposed second plate members, the diameter of the fastening hole of the innermost second plate member is superimposed. Since the hole diameter is formed to be the largest, abrupt load stress does not act during the plastic working of the first plate-like member by the punch, and the amount of bending becomes larger, so that the first plate-like member is bent at the first plate-like member. There is no danger of tearing occurring at the boundary between the bent part and the part that was not bent,
The punch can be pressed in a smooth and stable state, and a more reliable fastening method can be realized.

According to the fifth aspect of the present invention, a chamfer is provided or a curved surface is formed on the first plate-like member side of the fastening hole of the second plate-like member superposed on the innermost side. Even when the innermost second plate-shaped member and the punch are fastened in a state where their central axes are not aligned, the opening of the innermost second plate-shaped member is chamfered or curved. Along the outer peripheral surface of the tip of the punch,
The central axis of the fastening hole of the innermost second plate-shaped member moves in a direction to absorb the deviation from the central axis of the punch, that is, moves in the radial direction. As a result, the center axis of the fastening hole coincides with the center axis of the punch, so that the first plate-shaped member and the innermost second plate-shaped member are fastened without loosening or rattling. The fastening state can be further stabilized.

According to the sixth aspect of the present invention, the openings of the fastening holes of the plurality of second plate-like members are chamfered or curved so that the second plate-like members have the same shape. Since the bent portion of the first plate-shaped member enters into and bends the chamfered or curved surface of the shaped member, the fastening strength is increased by that amount, and a more secure fastening state can be maintained. A highly reliable fastening method can be provided.

Further, according to the seventh aspect of the present invention, the second plate-shaped member provided inside is formed of an elastic material, that is, the portion serving as the spacer is formed of, for example, a rubber material. If a material is used for the spacer, cushioning properties can be imparted.

Further, according to the eighth or tenth aspect of the present invention, after the bent portion is held at the hole edge of the fastening hole, the tip of the bent portion protruding from the hole edge of the fastening hole is turned outward. Since the bent portion protruding from the fastening hole of the outermost second plate-like member is folded back to the outer surface and locked on the outer surface, a stronger fastening force is generated, so that the high fastening state is maintained for a long period of time. And a more reliable fastening method can be realized.

[Brief description of the drawings]

FIG. 1 is a process diagram showing a method for fastening a plate-like member according to the present invention.

FIG. 2 is a view showing the same process.

FIG. 3 is a view showing the same process.

FIG. 4 is a view showing the same step.

FIG. 5 is a cross-sectional view showing a fastening state between the first plate member and the second plate member fastened by the fastening method.

FIG. 6 is an explanatory diagram showing a relationship between an inner diameter of a fastening hole of a second plate-shaped member and an outer diameter of a punch.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st plate-shaped member 1A Processing hole 2 2nd plate-shaped member (innermost 2nd plate-shaped member) 2A Fastening hole 2C (upper) opening edge 2E (lower) opening edge 3 2nd plate -Shaped member (outermost second plate-shaped member) 3A fastening hole 3B outer surface 3C (upper) opening edge 3E (lower) opening edge 4 first guide member 4A guide hole 5 punch 5A straight portion 5B enlarged portion 6th 2 Guide member 6A Guide hole 7 Ejector A Upper die B Lower die

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Nishio 2-13-13 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture Inside Ricoh Elemex Co., Ltd. (72) Inventor Junichi Ichikawa 2-2-2 Nishiki, Naka-ku, Nagoya City, Aichi Prefecture No. 13 Ricoh Elemex Co., Ltd.

Claims (10)

[Claims] 1. A first plate-like member for fastening and a second plate-like member for fastening are overlapped, and a portion corresponding to a fastening hole of the second plate-like member is punched with a punch to pierce said part. A part of the first plate-like member is bent, the bent part is held by the hole edge of the fastening hole, and the plate-like member is fastened to the first plate-like member to fasten the second plate-like member. In the method, the inner diameter of the bent portion is made uniform at the straight portion at the tip of the punch, while the enlarged portion formed at the base of the straight portion has a larger diameter than the straight portion and bites into the first plate-shaped member. A method of fastening a plate-like member, wherein the cut-in portion is also bent. 2. A portion of the first plate member corresponding to a fastening hole of the second plate member when the first plate member and the second plate member are overlapped. 2. The method for fastening a plate-like member according to claim 1, wherein a processing hole for burring is formed in the plate. 3. The device according to claim 1, wherein a plurality of the second plate-shaped members are overlapped and fastened to the first plate-shaped member.
The method for fastening a plate-shaped member according to the above. 4. The hole diameter of the fastening hole of the second innermost plate-shaped member, which is the largest among the diameters of the fastening holes of the second laminated plate-shaped member, is formed. The method for fastening a plate-shaped member according to claim 3. 5. The plate according to claim 3, wherein a chamfer is provided or a curved surface is provided on a side of the first plate-like member of a fastening hole of the second plate-like member which is superimposed on the innermost side. Method of fastening the shaped member. 6. The fastening method for a plate-like member according to claim 3, wherein a chamfer is provided or a curved surface is formed at an opening of each of the fastening holes of the second plate-like member that is overlapped by a plurality of pieces. 7. The method for fastening plate members according to claim 3, wherein the second plate members provided inside are formed of an elastic material. 8. The plate according to claim 1, wherein the bent portion is held by a hole edge of the fastening hole, and then a tip of the bent portion protruding from the hole edge of the fastening hole is turned outward. Method of fastening the shaped member. 9. A first plate-like member for fastening and a second plate-like member for fastening are overlapped, and a portion corresponding to a fastening hole of the second plate-like member is punched with a punch to pierce said portion. A part of the first plate-like member is bent, the bent part is held by the hole edge of the fastening hole, and the plate-like member is fastened to the first plate-like member to fasten the second plate-like member. In the apparatus, the punch has a straight portion having a uniform inner diameter of the bent portion, and an enlarged portion formed at the base of the straight portion and having a diameter larger than that of the straight portion and biting into the first plate-shaped member to be bent. And a fastening device for a plate-shaped member. 10. An ejector facing the punch after the bent portion is held by the hole edge of the fastening hole, and the tip of the bent portion protruding from the hole edge of the fastening hole is turned outward. The plate-shaped member fastening device according to claim 9, comprising: