JP6025579B2 - How to attach clinch stud to metal plate - Google Patents

Description

  The present invention relates to a method for attaching a clinch stud to a metal plate material for fitting and fixing the clinch stud to a mounting hole provided in the metal plate material by press fitting.

  The clinch stud is a so-called caulking bolt that is also called a clinch stud. The clinch stud is easily and firmly fixed to the metal plate material by press-fitting into a mounting hole provided in the metal plate material. Thereby, the fastening structure of a clinch stud and a metal plate material is obtained, and the troublesome trouble by welding is unnecessary. As an example of clinch stud, as shown in Fig. 1 and Fig. 2, the product Strax Clinch Stud (Strax is Acquired Intellectual Properties LLC, a registered trademark owned by Yamashina Co., Ltd.) is known. ing. This clinch stud 10 is a disc-shaped retaining ring that extends slightly outward in the radial direction from the screw body 12 between the disk-shaped head 11 and the rod-shaped screw body 12 in this order. 13, a holding groove 14 slightly recessed in the radial direction from the screw body 12, and a mountain shape radially outward at six circumferential positions of the holding groove 14 disposed on the holding groove 14 side of the head 11. And a non-rotating protrusion (pushing lobe) 15 extending in the direction. The diameter of the mounting hole of the flat metal plate material into which the clinch stud 10 is fitted is slightly larger than the outer diameter so that the screw body 12 can be fitted, and the outer diameter so that the holding ring 13 cannot pass through. It has been made slightly smaller.

  The procedure for attaching the clinch stud 10 to the attachment hole 2 of the metal plate 1 is performed as shown in FIG. First, a metal plate 1 is placed on a receiving die 4 having a through hole 5 having substantially the same diameter as the mounting hole 2 with the mounting hole 2 aligned with the through hole 5, and a clinch stud 10 is fitted into the mounting hole 2. (See FIG. 8 (a)). In this state, when a pressing force P is applied from the head 11 side, the holding ring 13 is press-fitted into the mounting hole 2 to expand the mounting hole 2 (see FIG. 8B). Further, when the clinch stud 10 is press-fitted, the holding ring 13 penetrates the mounting hole 2, and the metal plate 1 is crushed in a state of being sandwiched between the holding ring 13, the head 11, and the anti-rotation protrusion 15. The compression ring is disposed between the holding ring 13 and the anti-rotation projection 15 and the head 11 (see FIG. 8C). As a result, the metal plate 1 is fixed in a state of being bitten into the holding ring 13 and the rotation-preventing protrusion 15, and the periphery of the mounting hole 2 is firmly pressed against the holding groove 14 side.

  Since the clinch stud 10 is firmly attached to the metal plate 1 in this way, a high unloading load and idling torque can be obtained. Therefore, when the mating member is screwed to the screw body 12 of the clinch stud 10, the clinch stud 10 The rotation is suppressed and a stable screwing operation is ensured. For example, according to data provided by the manufacturer on the Internet, etc., clinch stud: M5 × 0.8 and metal plate material thickness 1.0-2.3mm, idling torque is 8N · m, clinch stud : When M6 × 1.0 and the plate thickness of the metal plate material is 1.0 and 1.6 to 3.0 mm, the idling torque is 11 N · m and 18 N · m, respectively. However, this data is in a stable state when the area of the metal plate 1 is infinite. That is, when the holding ring 13 is press-fitted into the mounting hole 2, the mounting hole 2 is pushed and widened, but if the width of the metal plate 1 is wide, the diameter of the mounting hole 2 can be suppressed from the surroundings. The area of the metal plate 1 is infinite means a range in which the pressing force on the holding groove 14 side around the mounting hole 2 is not reduced.

  By fastening the clinch stud and the metal plate material, the assembly accuracy of both is high, and the secrecy of the assembly part is obtained, and welding for attaching the clinch stud is unnecessary, so there is no generation of welding flaws and rust, and no rework is necessary. . Furthermore, since welding is not required, it can be assembled to plated parts, and a combination of an aluminum product and a non-weldable material such as a stainless steel stud is also possible. In addition, a lot of effects are obtained such that the equipment necessary for the fastening work between the clinch stud and the metal plate material is simple and excellent in energy saving, and the mounting condition can be visually inspected. As a result, as a component in which the clinch stud is fastened to the metal plate material as described above, for example, as shown in Patent Document 1 (described in the same document as “Strax Bolt”), an airbag apparatus for an automobile is used. The air bag case is attached to the air bag case and used in a large amount for applications such as fixing the air bag case to the vehicle body.

JP 2009-18714 A

  By the way, in the case of the conventional fastening structure of clinch studs to a metal plate material, the diameter of the mounting hole provided in the metal plate material is inevitably slightly larger than the outer diameter of the screw body, and the outer diameter of the retaining ring. It has been made slightly smaller. Therefore, when the clinch stud retaining ring penetrates the mounting hole and the metal plate is squeezed between the retaining ring, the head and the non-rotating protrusion, the amount of pressing of the metal plate into the retaining groove Therefore, there is a limit that the detachment load and idling torque of the clinch stud are physically limited to the above-mentioned data, and no further characteristics can be obtained. Nevertheless, when the area of the metal plate is infinite, that is, within a range not affected by the diameter of the mounting hole, the size of the data is secured.

  However, the width at the mounting hole position of the metal plate material is narrow, for example, about 15 to 20 mm, for example, when it is arranged in a narrow space where many other members are arranged, such as a member used in a vehicle. Limited to value. Therefore, when the retaining ring of the clinch stud passes through the mounting hole, the deformation of the metal plate material causes the plastic deformation state to spread on the outer edge side of the metal plate material, and is then sandwiched between the holding ring and the non-rotating protrusion. When the metal plate material is crushed, the plate material around the mounting hole cannot be fully returned into the holding groove. Therefore, when the metal plate material is fixed in a state where it bites into the holding ring and the rotation preventing projection, the pressing force from the mounting hole side to the holding groove side is reduced. As a result, in the case of a narrow metal plate material, the unloading load and idling torque after attaching the clinch stud are greatly reduced compared to the above data, and the mating member is screwed onto the clinch stud attached to the metal plate material. Since the clinch stud easily rotates when being attached, there is a problem that the stable screwing operation of the mating member is impaired.

  SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problem, and to easily and inexpensively obtain a highly reliable mounting structure that ensures a high pull-out load and idling torque when mounting clinch studs to mounting holes of metal plate materials. It is an object of the present invention to provide a method for attaching clinch studs to a metal plate that can be used.

In order to achieve the above-mentioned object, the structural feature of the present invention is that a slightly radial direction from a screw body arranged in order from the screw body side between a disk-shaped head and a rod-like screw body. A disk-shaped retaining ring that extends outward, a retaining groove that is slightly recessed in the radial direction from the screw body, and a detent protrusion that extends radially outward at multiple locations in the circumferential direction of the retaining groove Fit the clinch stud formed on the flat plate into the mounting hole of a flat metal plate having a mounting hole slightly larger than the outer diameter of the screw body and slightly smaller than the outer diameter of the retaining ring. A method of attaching a clinch stud to a metal plate material in which the metal plate material is fixed in a compressed state between the head and the non-rotating protrusion and the retaining ring by applying a pressing force from the head side, and the mounting hole for the metal plate material width at the position is 15~20mm, chestnut Before mating to Chisutaddo of the mounting hole, the periphery of the mounting hole of the metal plate, in the provision of the protrusion protruding from the flat surface of the metal plate by bending a metal plate into mating side of the clinch stud. The shape of the protruding portion is not limited to a flat surface or a curved surface, but may be any shape that protrudes from the flat surface. Moreover, although it is preferable that it is an annular | circular shape provided along the perimeter of the attachment hole about the protrusion part, you may be provided in a part of periphery of the attachment hole.

  In the present invention configured as described above, when the clinch stud is fitted into the mounting hole of the metal plate material and a pressing force is applied from the head side, the holding ring is press-fitted into the mounting hole, and the protrusion around the mounting hole is formed. Push out. Further, when the clinch stud is press-fitted, the holding ring penetrates the mounting hole, and the metal plate material is crushed in a state of being sandwiched between the head and the holding ring. At the time of this crushing, the anti-rotation protrusion crushes the metal plate material and bites into the metal plate material, and the protruding portion around the mounting hole is pushed and crushed from the head side and is pushed radially inward. Therefore, the protrusion is pressed against the holding groove relatively inward in the radial direction compared to the conventional metal plate material, and the tightening force by which the protective groove side is tightened is significantly larger than that of the conventional flat metal plate material. Increased value. As a result, according to the present invention, in the structure for attaching the clinch stud to the metal plate material, a significantly higher unloading load and idling torque can be obtained than before, so that when the mating member is screwed onto the screw body of the clinch stud, the clinch Stud rotation is suppressed, and a stable screwing operation is ensured.

In particular, in the present invention, when the width of the mounting hole position of the metal plate material is as narrow as 15 to 20 mm, and the retaining ring of the clinch stud penetrates the mounting hole, both sides in the width direction are caused by plastic deformation around the mounting hole of the metal plate material. It caused the spread to be, when the metal sheet is crushed in a state sandwiched between the retaining ring and the head and the detent projection, protrusion of metal sheet is sufficiently pressed against the retaining groove. As a result, in the present invention, even in the case of a narrow metal plate material, the unloading load and idling torque after attaching the clinch stud are greatly increased as compared with the conventional case, so the screw body portion of the clinch stud attached to the metal plate material When the mating member is screwed together, rotation of the clinch stud is reliably suppressed, and a stable screwing operation is ensured.

In the present invention, before the clinch stud is press-fitted into the mounting hole of the metal plate material, by providing a protrusion around the mounting hole of the metal plate material, the clinch stud is press-fitted and the protective ring penetrates the mounting hole, When the plate material is crushed in a state sandwiched between the head and the detent projection and the retaining ring, the tightening force for tightening the protective groove side by the protruding part is higher than that of the conventional metal plate material around the mounting hole is flat It will be much larger. As a result, in the present invention, since a high pull-out load and idling torque in the structure for attaching the clinch stud to the metal plate material can be obtained, the work of screwing the mating member to the screw body of the clinch stud is ensured. In particular, in the present invention, even if the width at the mounting hole position of the metal plate material is as narrow as 15 to 20 mm, the unloading load and idling torque after mounting the clinch stud are greatly improved as compared with the conventional case. The reliability of attachment to the metal plate is sufficiently secured.

It is a front view which shows the clinch stud used in the Example of this invention. It is a top view which shows the clinch stud. It is a partially broken sectional view which shows the metal plate material used in the Example. It is a top view which shows the metal plate material. It is sectional drawing which shows the state immediately after the clinch stud was inserted in the attachment hole of a metal plate material. It is sectional drawing which shows roughly the process in which the clinch stud is press-fitted in the attachment hole of a metal plate material. It is a partially broken sectional view which shows the metal plate material which is another example. It is a partially broken sectional view which shows roughly the formation process of the attachment structure to the metal plate material of the clinch stud which is a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a partially broken cross-sectional view of a flat metal plate used for carrying out the method of attaching the clinch stud to the metal plate according to the embodiment. The metal plate 20 is an annular protrusion which is an annular protrusion that is bent conically from the flat plate surface around the mounting hole 21 to the fitting side of the clinch stud 10 (upward in FIG. 3) and protrudes conically. It becomes part 22. The inclination angle of the annular protrusion 22 is about 30 °, which is the most preferable. The relationship between the clinch stud 10 and the clinch stud 10 and the mounting hole 21 of the metal plate 20 is as described above.

Next, a method for attaching the clinch stud 10 to the metal plate 20 will be described.
As shown in FIG. 5, when the clinch stud 10 is fitted into the mounting hole 21 of the metal plate 20 from the screw body 12 side and a pressing force P is applied from the head 11 side, as shown in FIG. 13 is press-fitted into the mounting hole 21 to expand the mounting hole 21. Further, when the clinch stud 10 is press-fitted, the holding ring 13 passes through the mounting hole 21, and the metal plate 20 is crushed in a state of being sandwiched between the head 11, the anti-rotation protrusion 15 and the holding ring 13. The state is the same as shown in FIG. At the time of this crushing, as shown in FIG. 6, the annular projecting portion 22 around the mounting hole 21 is pushed from the head 11 side, bent inward in the radial direction, and crushed. Therefore, the annular protrusion 22 is pressed in a relatively large amount inward in the radial direction as compared with the conventional metal plate material, and the tightening force by which the protective groove 14 side is tightened is markedly greater than that of the conventional flat metal plate material. growing.

  As a result, in the present embodiment, the unloading load and idling torque in the structure for attaching the clinch stud 10 to the metal plate material 20 is 50% or more higher than that of the conventional metal plate material having a flat mounting hole periphery. Since the rotation of the clinch stud 10 is suppressed when a mating member (not shown) is screwed to the screw body 12 of the clinch stud 10, the stability of the mating operation of the mating member is ensured. .

  In particular, when the retaining ring 13 of the clinch stud 10 penetrates the mounting hole 21 as in the case of a narrow metal plate 20 having a width of about 15 to 20 mm at the position of the mounting hole 21 such as an air bag case for an automobile. In addition, the annular protrusion 22 is sandwiched between the holding ring 13, the head 11, and the anti-rotation protrusion 15 even in an application in which plastic deformation around the mounting hole 21 of the metal plate material 20 causes expansion on both sides in the width direction. The ring-shaped protrusion 22 is sufficiently pressed against the holding groove 14 when being crushed by. As a result, in the present embodiment, even in the case of the narrow metal plate material 20, the unloading load and idling torque after the clinch stud 10 is attached are greatly improved compared to the conventional case, and the clinch stud 10 is attached to the metal plate material 20. Is sufficiently strong. Therefore, when the mating member is screwed to the screw body 12 of the clinch stud 10, the rotation of the clinch stud 10 is suppressed, and the stability and reliability of the mating operation of the mating member are ensured.

  Next, specific examples will be described. This is a case where the width of the metal plate 20 around the mounting hole 22 is 15 to 20 mm. Clinch stud: When the thickness of the metal plate 20 was M5 × 0.8 and the plate thickness was 1.0 to 2.3 mm, the idling torque was 9 N · m or more. Further, in the case of clinch stud: M6 × 1.0 and the thickness of the metal plate 20 was 1.0, the idling torque was 12 N · m or more. In addition, when the clinch stud was M6 × 1.0 and the plate thickness was 1.6 to 3.0 mm, the idling torque was 19 N · m or more. About the result of these Examples, it is a value higher than the data obtained when the metal plate material was infinitely wide as described in the background art section (see paragraph 0004).

  As for the annular protrusion provided around the mounting hole 21 of the metal plate member 20, as shown in FIG. 7 as another embodiment, the inclined shape may be a curved annular protrusion 24, or other metal What is necessary is just to protrude from the flat surface of a board | plate material, and it is not limited to a specific shape. In the above embodiment, the annular protrusions 22 and 24 are provided along the entire circumference of the attachment hole 21, but instead, the protrusion is provided at a part of the periphery of the attachment hole. It may be what was made. In addition, the structure of the clinch stud used in the above embodiment and the annular protrusion of the metal plate material is an example, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Clinch stud, 11 ... Head, 12 ... Screw body part, 13 ... Protection ring, 14 ... Protection groove, 15 ... Anti-rotation protrusion, 20 ... Metal plate material, 21 ... Mounting hole, 22, 24 ... Annular protrusion part.

Claims (1)

A disc-shaped retaining ring that is disposed between the disc-shaped head portion and the rod-shaped screw barrel portion in order from the screw barrel portion, and extends slightly radially outward from the screw barrel portion; A clinch stud having coaxially provided holding grooves that are slightly recessed in the radial direction from the portion and rotation-preventing protrusions extending radially outward at a plurality of locations in the circumferential direction of the holding grooves . A flat metal plate having a mounting hole having a diameter slightly larger than the outer diameter and slightly smaller than the outer diameter of the retaining ring is fitted into the mounting hole from the screw body side, and a pressing force is applied from the head side. A method of attaching a clinch stud to a metal plate material, wherein the metal plate material is fixed in a compressed state between the head and the detent projection and the retaining ring by adding,
The width at the mounting hole position of the metal plate material is 15 to 20 mm,
Prior to fitting the clinch stud to the mounting hole, a protruding portion that protrudes from the flat surface of the metal plate material by bending the metal plate material to the fitting side of the clinch stud around the mounting hole of the metal plate material A method of attaching clinch studs to a metal plate material, characterized by comprising:

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