JP3100223U - Nut-integrated plate-shaped parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut-integrated plate-shaped part with increased indentation load strength and torque load strength required for a nut, and to meet a demand for weight reduction of a nut-shaped plate-shaped part.
SOLUTION: A plate-shaped bracket (a plate-shaped component integrally formed with a nut) W is formed by forging a relatively thin sheet metal made of a material, and integrally projecting a nut 11 to a main body plate 10. A nut is formed integrally with the main body plate by providing a taper 12 having a burring portion formed gradually thicker toward the main body plate with respect to the screw center line S.
[Selection diagram] Fig. 1

Description

The present invention relates to a nut-integrally formed plate-shaped part obtained by processing a sheet metal as a material and projecting a nut integrally with a main body plate, among various plate-shaped parts such as a plate-shaped mounting bracket for a door hinge for an automobile.

2. Description of the Related Art Conventionally, for example, a plate-like component in which a nut is integrated with a main body plate in an automobile part generally has a main body plate 1 and a nut 2 which are separate from each other and a base main body plate as shown in FIG. A hole 1a is made in the hole 1 and a nut 2 having a welding protrusion on one side is welded to one side in accordance with the center line of the hole 1a.

However, in this case, since a separate welding step is required, conventionally, a sheet metal of a material is pressed and, for example, as shown in FIG. There has been proposed a nut-integrated molded plate-shaped part which is formed by integrally molding to omit a welding process.

However, in the case of a conventional nut-integrated plate-shaped part, a thin sheet metal is used as a processing material in recent years as the weight of the part is strongly demanded, but the burring portion 4a of the nut 4 has a small thickness. The thickness of the main body plate 3 is formed so as to be approximately the same as the thickness of the main body plate 3. Therefore, the thin burring portion 4 a causes the nut 4 to have a required strength, for example, an axial pushing load strength or a torque load strength. There was a problem that was not obtained.

Therefore, in order to solve the above-mentioned problem, the invention according to claim 1 is, for example, as shown in the following illustrated embodiment, forging a relatively thin sheet metal of a material and integrally forming a nut 11 with the main body plate 10. The burring portion 11a of the nut 11 is provided with a taper 12 on the outer periphery of the burring portion 11a, the burring portion 11 being gradually thicker toward the main body plate 10 side with respect to the screw center line S, thereby providing the nut 11 with the main body. It is characterized by being formed integrally with the plate 10.

According to a second aspect of the present invention, in the nut-integrated plate-shaped part according to the first aspect, for example, the burring portion 11a is increased with respect to the thickness D of the main body plate 10 as shown in the following embodiment. The thickness ratio is substantially doubled.

According to the invention as set forth in claim 1, even if the main body plate side is a thin plate, an axial pushing load strength and a torque load strength required for the nut by the amount that the burring portion is formed thicker by the tapered shape. Therefore, it is possible to meet the demand for weight reduction of the plate-shaped component with the nut. In addition, the range of guarantee of the required strength of the nut is expanded, and as a result, the effect that the strength tuning corresponding to the strength of the part where the plate part with the nut is used can be achieved can be achieved.

In addition, according to the invention of claim 2, as the thickening rate in the burring portion increases, the axial indentation load strength and torque load strength required for the nut further increase, thereby expanding the strength assurance range. Can be done.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The nut-integrated plate-shaped component according to the present invention has the purpose of increasing the indentation load strength and torque load strength required for the nut and guaranteeing it, while also meeting the demand for weight reduction of the nut-mounted plate-shaped component. Forging a relatively thin sheet metal without using a thick sheet metal, and providing a taper on the outer periphery of the burring part of the nut to gradually form a thicker burring part toward the body plate side with respect to the screw center line, It was realized by molding.

1 and 2 show an example of the nut-integrated molded plate-shaped part of the present invention. FIG. 1 is a longitudinal sectional view showing a nut-integrated plate-shaped part at a nut position, and FIG. 2 is a perspective view. In the illustrated example, a plate-shaped bracket W attached to a door hinge for a mini vehicle will be described as an example of a plate-shaped component integrally formed with a nut.

The plate-shaped bracket W is formed by a sheet metal forging method using a relatively thin sheet metal having a thickness of, for example, 1.2 t (mm) to 2.0 t (mm) as a processing material. Then, as shown in FIG. 2, a slightly elongated body plate 10 and nuts 11 for screwing bolts are integrally protruded near both ends of the body plate 10. In particular, when forging a material sheet metal, the nut 11 has a taper on the outer periphery of the burring portion 11a to gradually increase the thickness of the burring portion 11a toward the main body plate 10 with respect to the screw center line S as shown in FIG. 12 and is formed integrally with the main body plate 10.

Therefore, in the plate-shaped bracket W to be forged, the main body plate 10 is formed as it is as a thin plate having a thickness of 1.2 to 2.0 mm, while the nut 11 has the burring portion 11a on the main body plate 10 side. The taper angle α gradually increases and the wall thickness is increased by an amount corresponding to the wall thickness, and the strength is accordingly increased to form a substantially conical shape. In the illustrated example, assuming that the thickness of the main body plate 10 is D and the thickness of the burring portion 11a of the nut 11 (the distance from the midpoint between the thread and the valley to the outer surface at right angles) is T, It is formed so that the thickness ratio (T / D) of the burring portion 11a of the nut 11 becomes approximately twice the thickness D. In addition, the nut 11 is formed to have an increased wall thickness at the burring portion 11a and, as shown in FIG. 1, has a height at which the number of effective threads in the screw hole 11b is large (in the illustrated example, six threads are formed). The burring portion 11a is formed so as to have the same height as the burring portion 11a.

Therefore, the applicant applied a screw load of the nut 11 to the plate-shaped bracket W in which a nut 11 having a screw hole diameter of M8 × 1.25 according to JIS was integrally formed on a main body plate 10 having a plate thickness of, for example, 1.2 t. A strength test was performed.

First, as shown in FIG. 3 (A), a bolt 12 is screwed into the screw hole of the nut, and an indentation load strength test (JIS standard B1052) is performed when the bolt 13 is broken by applying an axial load. Was. As a result, a high measured value of the indentation load strength of 43 to 46 kN was obtained, and the NUT strength category 12 (42.5 kN) could be cleared. In addition, a test result that the strength guarantee range of the indentation load strength was also expanded was obtained. At the same time, as shown in FIG. 3 (B), a maximum torque load strength test when the bolt 13 was broken by applying a torque. As a result, a high measured value with a torque load strength of 73 to 76 N · m was obtained. In addition, it was possible to obtain a test result that the range of guaranteed torque load strength was also expanded.

In the illustrated example, a plate-shaped bracket W of a door hinge for a mini vehicle is illustrated as an example of a plate-shaped component integrally formed with a nut. It is needless to say that the present invention can be applied to various plate-like parts with nuts, such as parts and front panel parts.

1 is a longitudinal sectional view showing a nut-integrated plate-shaped part according to the present invention at a nut position. It is an external appearance perspective view of a nut integral molding plate-shaped part. (A) is an explanatory view of a nut pushing load strength test, and (B) is an explanatory view of a nut torque load strength test. (A) is a longitudinal cross-sectional view showing the structure of a conventional plate member with a welded nut, and (B) is a longitudinal sectional view showing the structure of a conventional press-molded plate member with a nut.

Explanation of reference numerals

D Body plate thickness W Plate bracket (Integrally molded plate part)
S Screw center line T Thickness of burring part 10 Body plate 11 Nut 11a Burring part 12 Taper

Claims (2)

A relatively thin sheet metal is forged and a nut is integrally protruded from the main body plate, and the burring part is gradually thickened toward the main body plate side with respect to the center line of the screw around the burring part of the nut. A nut-integrated molded plate-shaped part, wherein the nut is integrally molded with the main body plate with a formed taper. The nut-integrated molded plate-shaped part according to claim 1, wherein a thickness increase rate of the burring portion is approximately doubled with respect to a thickness of the main body plate.

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