JPS62148035A - Joining device for metallic thin sheet - Google Patents

Abstract

PURPOSE:To strongly join metallic thin sheets by a simple device by employing a side opening method on the die main body in case of deforming overlapped plural metal thin sheets by upsetting by a punch and die. CONSTITUTION:Two sheets of metallic thin sheets 1a, 1b are pressed to the upper end face of the main body 4 of a die by pressing it by a punch 3 in the overlapping state. A bottomed cylindrical projecting part 8 is further formed by bulging the pressure receiving part of the metal thin sheets 1a, 1b in the pressure direction by increasing the pushing in stroke of the punch 3 and pushed into a die hole 2. This die main body 4 is composed of the two pieces of movable die pieces 4a, 4b which are energized in closing direction always by a pressure spring 7, and the projecting part 8 bulges in the radial direction of the die hole 2 against the energizing of the movable die pieces 4a, 4b when reaching to the still pressure receiving face 5 at the upper end of an axial pressure receiving member 6. In this way the projecting part 8 of the metal thin sheets 1a, 1b is swaged in an integral structure and the metal thin sheets 1a, 1b are strongly joined.

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for joining 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 an excellent simple structure.

Conventionally, methods such as riveting, fastening with bolts and nuts, welding, and gluing have been adopted as means for joining 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 these protrusions are fitted into each other and the free ends of the fitted side protrusions are expanded in the radial direction to form a coupling structure with excellent leak-proof properties. In this method, the process of forming a cap-shaped protrusion 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 conventional technology as described above, for example, Japanese Patent Application Laid-open No. 114536/1983 discloses a method that includes a punch and a die hole whose diameter gradually increases in the direction of entry of the punch. A plate joining device has been proposed that includes a die and a movable swaging table that is fitted onto the axis of the die and functions as a pressure-receiving member for the punch.

(From the above) The metal thin plate joining apparatus described in the above-mentioned Japanese Patent Application Laid-Open No. 56-114536 provides 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 size 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 shape must be changed, and if the dimensions of the die hole are changed, the travel stroke of the movable swaging table must also be adjusted.For these reasons, the overall structure of the joining device is It becomes extremely complicated and cannot produce the expected effect in terms of improving operability.

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 objective, 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 side-opening die body (4) that is constantly biased toward the closing direction by a spring (7) that causes swaging deformation in (lb)..., and a die body (4) formed at the upper end of the die body. A stationary pressure-receiving surface (5) at a constant height is placed at the lower end of the die hole (2) while being fitted into the die hole (2).
The gist of the present invention is to provide a joining device for thin metal plates, which comprises a shaft-shaped pressure-receiving member (6).

Sakuri Two or more thin metal plates (Ia) (lb) --- are pressed by a punch (3) in an overlapping state, and a die hole (2) is formed at the upper end of the die body (4). Pushed inside. The lower surface of the protrusion (8) of the thin metal plate (la) (1bL-) pushed into the die hole (2) is exposed to the shaft-shaped pressure receiving member (
6) is pressed against the stationary pressure-receiving surface (5) formed at the upper end and stands still, and in this state the protrusion (8) is pressed against the punch (8).
The additional downward stroke of step 3) reduces the laminated thickness while resisting the pressing force of the spring (7) to open the die hole (
2) bulges in the radial direction. As a result, a thin metal plate (la
) (lb) - The protruding portions (8) of - are swaged into an integral structure, and the thin metal plates (la) (1bL-) are firmly joined together.

Figure 1A is a partially sectional front view of the apparatus of the present invention, and Figure 1B is a plan view thereof.

FIG. 1C is a plan view illustrating a second embodiment of the invention. Further, FIGS. 2 to 5 are explanatory diagrams of the operating state of the apparatus of the present invention.

As can be seen in these figures, the device according to the invention has a diameter d
= 2 (tl + tt) (+/-20%) and a die hole diameter of D = d + 0.8 (tx + t2) (where tl and t2 are the thicknesses of the metal sheets to be joined) It is composed of a side-opening die body (4) and a shaft-shaped pressure receiving member (6) forming a stationary pressure receiving surface (5) at the lower end of the die hole (2).

The punch (3) is attached to a ram device (not shown) that can open the stroke in order to reduce the bonding strength between the thin metal plates (la) and (lb). On the other hand, the die body (4) has two movable die pieces (4a) which are always urged in the closing direction by a pressure spring (7).
(4b). These movable die pieces (4a) (4b) are joined or placed opposite each other by a pin (4c) or a guide rail (4d), so that they can simultaneously approach each other or move against the pressing force of the pressure spring (7). It forms a side-opening die device that separates at the same time.

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 (LA) (LB)
are pressed by a punch (3) in an overlapping state,
It is pressed against the upper end surface of the die body (4). At the beginning of this pushing operation, the movable die pieces (4a) (4b) constituting the die body (4) do not move in the separating direction, and therefore the diameter of the die hole (2) does not change. When the pushing stroke of the punch (3) further increases, the pressure-receiving area of the thin metal plate (la) (lb) swells in the pressing direction of the punch (3), resulting in a bottomed cylindrical protrusion as seen in Figure 3. It is pushed into the die hole (2) formed at the upper end of the die body (4) while forming the part (8). After this, the lower surface of the bottomed cylindrical protrusion (8) is exposed to
A stationary pressure receiving surface (5) formed at the upper end of the shaft-shaped pressure receiving member (6).
) and stands still, and in this state the protrusion (8
) is increased by the additional lowering of the punch (3).
tl+t2) is decreased to t3, the movable die pieces (4a) (4b) are bulged in the radial direction of the die hole (2) against the urging force in the closing direction by the pressurizing spring (7). As a result, the protrusions (
8) is installed as an integral structure, and two thin metal plates (
la) (Ib) is firmly bonded. At the final stage of the joining operation, the movable die pieces (4a) (4b)
As seen in FIG. 3, the metal thin plate (1a
) (1b) and the pressure from the lateral direction by the pressure spring (7), and move in the separating direction. 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 expanded die hole (2). 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) returns to its original shape by bringing the movable die pieces (4a) (4b) closer together by the elastic restoring force of the pressurizing spring (7), and then returns to its original shape. It enters the preparation state for the joining operation.

Temperature Generation I and KuguriAs can be understood from the above explanation, by using the device of the present invention, no suitable joining means other than re-tightening, bolting, welding, or adhesion has been found so far. Sheet metal sheets can be joined into a monolithic structure by swaging. According to the present invention, since there is no need to drill rivet holes, bolt holes, etc. in the thin metal plates, the mechanical strength of the joint portion is significantly improved.

In addition, by adjusting the stroke of the ram device that drives the punch and the pressing force of the pressure spring, and changing the pressing thickness of the bottom of the protrusion, the strength of the bond between the two thin metal plates can be freely adjusted. Therefore, a wide range of bonding conditions can be selected from a completely integrally bonded state to a relatively strong bonded state that allows mutual rotation between the thin metal plates around the protrusion. The device of the present invention also has a very simple overall structure, which reduces the number of joining processes without requiring the drilling of rivet holes or bolt holes, and contributes to improved productivity. It is also possible to achieve an effect that is significantly higher than that 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. FIG. 1C is a plan view illustrating a second embodiment of the invention. Further, FIGS. 2 to 5 are explanatory diagrams of the operating state of the apparatus of the present invention. (la) (lb)--Thin metal plate, (2)-Dice hole, (3)-Punch, (4)-Die body, (4a) (4b)--Movable die piece, (5)- −・
Stationary pressure receiving surface, (6) - shaft-shaped pressure receiving member, (7) - spring.

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. A side-opening type die body is always biased toward the closing direction by a spring, and a certain amount is attached to the lower end of the die hole when the die body is fitted into the die hole formed at the upper end of the die body. 1. An apparatus for joining thin metal plates, comprising: a shaft-like pressure receiving member forming a stationary pressure receiving surface of a certain height;