JPS62148040A - Joining device for metallic sheet - Google Patents

Abstract

PURPOSE:To join firmly a metallic sheet by a simple device by energizing a movable die piece in an annular supporting member of an elastic material, and fitting and supporting it, when bringing plural pieces of superposed metallic sheets to an upsetting deformation by a punch and a die. CONSTITUTION:Two pieces of metallic sheets 1a, 1b are pressed by a punch 3, in a superposed state, and pressed against the upper end face of a die body 4. In this case, the die body 4 is constituted of plural pieces of movable pieces 4a-4d, energized toward the center of a die hole 2 in the inside of an annular supporting member 7 consisting of an elastic material (urethane rubber, etc.), and fitted, installed and supported. By pushing in the punch 3, a pressure receiving part of the sheets 1a, 1b becomes a bottomed cylindrical projecting part 8, made to stand still by a static pressure receiving surface 5, and thereafter, furthermore bulged in the radial direction of the die hole 2, and the projecting part 8 is formed integrally in one body structure and upset, and joined firmly. In the end of this joining operation, the movable die pieces 4a-4d are brought to a diameter expansion in the radial direction of the die hole 2 against anergizing of the annular supporting member 7, the bottom end part of the projecting part 8 is made to overhang, and the metallic sheets 1a, 1b are joined integrally in one body structure.

Description

[Detailed Description of the Invention] The present invention relates to a joining device for thin metal plates, and more specifically, for joining a laminate of two or more thin metal plates into an integral structure by swaging. The present invention relates to a swaging processing device that has a simple structure.

Jubeiza and■ Methods such as riveting, fastening with bolts or nands, welding, and gluing are used to join two or more laminated thin metal plates. However, when tightening with rivets or bolts and nuts, holes must be drilled into the thin metal plate for the rivets or bolts, which reduces the mechanical strength of the joint, and when welding or gluing, there are limitations due to the material. There were problems such as the need for special equipment.

On the other hand, for example, in Japanese Patent Publication No. 42-14680 and Japanese Patent Publication No. 41-5589, a cap-like protrusion is formed on each thin metal plate when joining two thin metal plates,
It is described that a coupling structure having excellent leak-proof properties is formed by fitting these protrusions into each other and expanding the free ends of the fitted remanufactured parts in the radial direction. In this method, the process of forming camp-shaped protrusions on a thin metal plate and the process of fitting the protrusions together and expanding the free ends of the side protrusions in the radial direction must be performed separately. However, the problem arises that equipment costs and operating costs rise.

As a solution to the problems recognized in the above conventional technology,
For example, Japanese Patent Application Laid-Open No. 56-1) 4536 discloses a punch, a die having a die hole whose diameter gradually increases in the direction of entry of the punch, and a state in which the die is fitted into the axial center of the die. A plate joining device has been proposed which includes a movable swaging table that functions as a pressure receiving member for the punch.

The metal thin plate joining apparatus described in Japanese Unexamined Patent Publication No. 1983-4536 is a highly productive joining method that replaces joining methods such as riveting, bolting, or welding. However, on the other hand, it has some practical problems. Namely, the diameter of the enlarged diameter part of the die hole depends on the thickness and material of the metal sheets to be joined, especially the plastic deformability. The size and shape must be changed, and the travel stroke of the movable swaging table must also be adjusted if the dimensions of the die hole are changed.For these reasons, the overall joining equipment The structure becomes extremely complicated, and the expected effect on improving productivity cannot be achieved.

A main object of the present invention is to provide a metal sheet joining apparatus having novel structural features that can solve the above-mentioned problems found in conventional metal sheet joining apparatuses.

In view of this purpose, the present invention provides a punch (3) that applies a pushing force into the die hole (2) on two or more stacked metal thin plates (LA) (LB)-; A thin metal plate (l) is pressed into the die hole (2) in cooperation with the punch.
a) A die body (4) consisting of a plurality of movable die pieces (4a), (4b), etc. that cause swaging deformation in (lb)--; A stationary pressure-receiving surface (
5), and the movable die pieces (4a), (4b), etc. are arranged inside an annular support member (7) formed from an elastic material. The gist of the present invention is a welding device for joining thin metal plates, which is fitted and supported in a biased state toward the center of a hole (2).

Two or more thin metal plates (LA) (LB) are stacked and pressed by a punch (3), and pushed into the die hole (2) formed at the upper end of the die body (4). . Thin metal plate (la) pushed into the die hole (2)
The lower surface of the protrusion (8) of (lb) is attached to the punch (3,)
At the end of the downward stroke of the annular pressure receiving member (6), the ring-shaped pressure receiving member (6) comes to rest against the stationary pressure receiving surface (5) formed at the upper end, and in this state, the protruding portion is pressed against the stationary pressure receiving surface (5) formed at the upper end of the annular pressure receiving member (6). bulges out in the radial direction of the die hole (2) while reducing the laminated thickness. As a result, a thin metal plate (l
a) The protrusion (8) of (lb) is swaged into an integral structure, and the thin metal plates (la) and (lb) are firmly joined together.

Implementation 2 FIG. 1A is a partially sectional front view of a thin metal plate joining apparatus according to the present invention, and FIG. 1B is a plan view thereof. 2 to 5 are explanatory views of the operating state of the device of the present invention.

As can be seen in these figures, the device according to the invention has a diameter d
Punch (3) with =2 (tt +t2) (+/-20%) and [)=d+0.8 (tt+t2)
A plurality of movable die pieces (4a
) (4b)..., and an annular pressure-receiving member (6) forming a stationary pressure-receiving surface (5) at the lower end of the die hole (2). The punch (3) is joined to a stroke-adjustable ram device (not shown) in order to make it possible to adjust the joining strength between the gold MWi plates (la) and (lb). The die body (4) places the movable die pieces (4a) (4b) - into the center of the die hole (2) inside an annular support member (7) made of an elastic material such as urethane rubber. A pressure receiving device is constituted by fitting and supporting the opposite side in a biased state. Hereinafter, the operating state of the device of the present invention will be explained based on FIGS. 2 to 5. First, as shown in FIG. 2, two metal thin plates to be joined, for example, cold rolled steel plates (1a)
) are pressed against the upper end surface of the die body (4) by being pressed by the punch (3) in the overlapping state. At the beginning of this pushing operation, various movable die pieces (4a)
(4b) does not open in the direction of diameter expansion, so the die hole (2
) also does not change. When the pushing stroke of the punch (3) further increases, the metal sheet (la) (lb)
The pressure-receiving portion bulges out in the direction of pressure applied by the punch (3) and is formed at the upper end of the die body (4), forming a bottomed cylindrical protrusion (8) as shown in FIG. is pushed into the die hole (2).

After this, the lower surface of the bottomed cylindrical protrusion (8)
As seen in the figure, at the end of the downward stroke of the punch (3), the shaft-shaped pressure receiving member (6) is pressed against a stationary pressure receiving surface (5) formed at the upper end and comes to rest. In this state, the protrusion (8) expands in the radial direction of the die hole (2) while reducing the laminated thickness from (tl+t2) to t3 by further lowering the punch (3). As a result, the protrusion (8) of the thin metal plate (la) (lb) is inserted into the die hole (2).
), and the two gold MWI plates (la) and (lb) are firmly joined. At the end of the joining operation, the movable die pieces (4a) (4b), which constitute the die body (4), move toward the center of the die hole (2) by the annular support member (7). The diameter of the protruding portion (8) expands in the radial direction against the bias of the sheet metal plate (la) (lb
) are joined into a monolithic structure. After this, as shown in Fig. 5, the punch (3) is returned to its original position, and the protrusion (8) of the joined thin metal plates (la) (lb) is inserted into the die hole (2) with an enlarged diameter. The joining operation of the two thin metal plates (la) and (lb) is completed by pulling them out. After the protrusion (8) has been extracted, the die body (4) automatically shrinks in diameter and returns to its original shape due to the restoring force of the annular support member (7), and is ready for the primary joining operation. Go into a state of preparation.

As can be understood from the above explanation, by using the device of the present invention, no suitable joining method other than riveting, bolting, welding, or adhesive has hitherto been found. According to the present invention, which allows thin metal plates to be joined into an integral structure by swaging forming, there is no need to drill rivet holes, bolt holes, etc. in the metal thin plates, so the mechanical strength of the joint part is significantly improved. do.

In addition, by adjusting the stroke of the ram device that drives the punch and the elastic deformability of the annular support member, and changing the crushing thickness of the bottom of the protrusion, it is possible to freely adjust the bonding strength between the two thin metal plates. Therefore, a wide range of bonding conditions can be selected, ranging from a completely integrally bonded condition to a relatively strong bonded condition that allows mutual rotation between the thin metal plates around the protrusion. Furthermore, since the device of the present invention has an extremely simple overall structure, the number of joining processes that do not require the drilling of rivet holes or bolt holes is reduced, and this also contributes to improved productivity. It is possible to achieve an effect that is significantly higher than the level of conventional equipment.

[Brief explanation of drawings]

FIG. 1A is a partially sectional front view of a metal sheet joining apparatus according to the present invention, and FIG. 1B is a plan view thereof. 2 to 5 are explanatory views of the operating state of the device of the present invention. (la) (lb) - thin metal plate, (2) - die hole, (3) - punch, (4)
-Dice body, (5)...Stationary pressure receiving surface, (6) -Annular pressure receiving member, (7)...Annular support member.

Claims (1)

[Claims] (1) A punch that applies pushing force into the die hole on two or more stacked metal thin plates, and a punch that works together with the punch to cause swaging deformation in the metal thin plate pushed into the die hole. It is composed of a die body made up of a plurality of movable die pieces, and a shaft-like pressure receiving member that forms a stationary pressure receiving surface of a constant height at the lower end of the die hole formed in the upper end of the die body, and A joining apparatus for joining thin metal plates, characterized in that the movable die piece is fitted and supported inside an annular support member made of an elastic material in a state where it is urged toward the center of the die hole.