JP2595275Y2 - Die for caulking - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caulking die used for connecting frame materials by caulking when manufacturing an iron frame or the like used as a building material.

[0002]

2. Description of the Related Art An iron frame used as a building material is connected to each other by caulking in order to improve the bonding strength. The caulking process is usually performed by punching using a punch and a die so that a pair of frame materials overlapped with each other is depressed in a concave shape, and caulking a portion protruding to the opposite side with a die. The frame members are connected to each other.

[0003] Japanese Patent Application Laid-Open No. 5-5230 discloses that a rubber sleeve is fitted to a plurality of blades each having an opening portion into which a swaged portion can be pressed by a punch, and the blades are used to move each blade inward. An energizing caulking die is disclosed.

[0004]

In the caulking dice having such a configuration, each of the blades is fitted with a rubber sleeve, and each of the blades is only urged by the sleeve. There is a possibility that a sufficient urging force is not applied to the blade, and a caulked portion that fits into the opening cannot be caulked sufficiently. In addition, the sleeve fitted to each blade may be easily lost from each blade and may be lost.

The present invention is intended to solve such a problem. The purpose of the present invention is to prevent the sleeve fitted to the blade from falling off and to force the blade inward by the elastic force of the sleeve. An object of the present invention is to provide a caulking die that can be biased.

[0006]

The caulking dice of the present invention are inserted through a cylindrical die body and an axial center of the die body such that one end of the die extends from the die body. Around the end of the anvil and the anvil extending from the die body, the anvil is attached to the die body so as to be rotatable inward and outward. A plurality of blades formed in the portion, an elastic sleeve fitted to the outside of each blade and the die body to urge each blade inward, and pressed against the elastic sleeve over the entire circumference.
The elastic sleeve is fitted outside the elastic sleeve
Caulking so that it is integrated with the die body via the leave
And an outer cylinder having a given rigidity.

[0007]

In the caulking die of the present invention, when the portion to be caulked by the punch is pushed into the opening formed by each blade, the portion to be caulked by each blade urged inward by the sleeve. Is caulked. Because a rigid outer cylinder is fitted to the sleeve, when the part to be caulked fits into the opening,
A strong urging force is applied inward by the sleeve, and that portion is securely caulked. There is no danger that the sleeve fitted into the rigid outer cylinder will fall off.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of a caulking die of the present invention, and FIG. 2 is an explanatory view of the operation thereof. As shown in FIG. 2, the caulking dice of the present invention are formed such that when the frame members 31 and 32 of an iron frame are caulked and joined together, a punch 40 is used to form a concave shape, and a portion protruding to the opposite side is caulked. Used to

As shown in FIG. 1, the caulking die 10 includes a cylindrical die body 12 and a die body 12.
And an anvil 13 which is attached to the die body 12 by passing through the inner shaft. The upper end of the anvil 13 through which the die body 12 is inserted extends above the die body 12. Around the anvil 13 extending above the die body 12, three blades 14 each having a shape in which a cylindrical body whose upper part is gradually narrowed are equally divided into three in the circumferential direction are arranged. Each blade 14 is opened so that a circular opening is formed in the upper end surface, and each lower end is diced by a pin 15 so that the upper end rotates inward and outward of the die body 12. It is attached to the inner peripheral surface of the main body 12.

A groove 12a is formed substantially all around the center of the die body 12 in the vertical direction.

A rubber sleeve 16 is fitted to the die body 12 and each of the cylindrical blades 14. The sleeve 16 has elasticity, and the upper part fitted to each blade 14 is thicker toward the upper side so as to correspond to the outer peripheral shape of each blade 14. Each blade 14 is urged inward by the elastic force of the upper part of the sleeve 16, and the portions around the opening of each blade 14 are in close contact with each other.

Further, the outer cylinder 1 made of copper is
7 are fitted. The outer cylinder 17 prevents the outer peripheral surface of the sleeve 16 from spreading outward. Outer cylinder 17
Are caulked inwardly by a center punch or the like at equal positions in the circumferential direction at positions corresponding to the grooves 12a formed in the die body 12, whereby the outer cylinder 17 falls off the sleeve 16. Is preventing that.

The caulking dice 10 having such a configuration is used as follows. The frame members 31 and 32 constituting the iron frame are placed on a circular opening formed at the upper end of each blade 14 in an overlapping state, and a punch 40 is hit from above the opening. As a result, each of the frame members 31 and 32 is recessed and protrudes to the opposite side, and the protruding portion fits into the upper end opening of each blade 14. At this time, when the protrusion is fitted into the opening, each blade 14 is pressed inward by the elastic sleeve 16 fitted in the copper outer cylinder 17 to caulk.

Since the sleeve 16 for urging the blade 14 inward is fitted in the rigid outer cylinder 17, the sleeve 16 does not have the possibility of spreading outward.
4 is strongly pushed inward. The outer cylinder is attached so as not to fall off from the sleeve 16 because it is depressed inward and caulked.

[0016]

[Effects of the Invention] In the caulking dice of the present invention, since the rigid outer cylinder is fitted to the elastic sleeve that urges the blade inward, the sleeve expands outward. There is no danger, and the sleeve applies a strong biasing force to the blade. Moreover, the outer cylinder prevents the sleeve fitted to the blade from falling off, and there is no risk of the sleeve being lost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a caulking die of the present invention.

FIG. 2 is an explanatory view of the operation of the caulking dice.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Die for caulking 12 Die body 13 Anvil 14 Blade 16 Sleeve 17 Outer cylinder

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor: Kazu Nishino 1-88, Oyodonaka, Kita-ku, Osaka-shi, Osaka Sekisui House Co., Ltd. (56) References JP-A-62-244533 (JP, A) Kaihei 5-5230 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B21D 39/03

Claims (1)

(57) [Scope of request for utility model registration] [1 claim: a cylindrical die body, in such a manner that one end is extending from the die body, die
Around the end of the anvil that extends from the die body and the anvil that passes through the shaft center of the die body, it is attached to the die body so that it can rotate inward and outward. a plurality of blades formed on the end portion of the opening to be pushed by a resilient sleeve for biasing to the fitted to each blade outside inwards of each blade and the die body, the entire circumference with respect to the elastic sleeve To be pressed across
Is fitted on the outside of the elastic sleeve,
Caulked so that it is integrated with the die body
A die for caulking, comprising: an outer cylinder having rigidity.