JPS62148038A - Joining device for metallic sheet - Google Patents

Abstract

PURPOSE:To firmly join a metallic sheet by a device having a simple structure, by providing an up-opened die hole diameter expanding mechanism on a die body of a split die, 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 state that they have been superposed, and pressed against the upper end face of a die body 4. In this case, the die body 4 is constituted by attaching integrally plural movable dies 4a, 4b as one body structure by a coil spring 7, and by a hinge pin 9 which has been provided on its lower end part, an up-opened die hole diameter expanding mechanism is formed. By pushing in the punch 3, a pressure receiving part of the metallic sheets 1a, 1b becomes a bottomed cylindrical projecting part 8, made to stand still by a static pressure receiving surface 5, and thereafter, bulged against a coil spring 7 in the radial direction of a die hole 2, upset and joined firmly. In the end of this joining operation, when the projecting part 8 is bulged, the movable die pieces 4a, 4b are opened in the radial direction in an up-opened state by using the hinge pin 9 as the center of oscillation, and promotes a crush of the projecting part 8.

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 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 thin metal plates stacked one on top of the other. 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 camp-shaped protrusion on the golden slope 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. In addition, 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.

The metal thin plate joining apparatus described in the above-mentioned Japanese Unexamined Patent Publication No. 56-114536 is a highly productive joining method that replaces joining methods such as riveting, bolting, or welding. However, on the other hand, there are some practical problems inherent in the method. The dimensions and shape of the die hole 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 structure of the bonding device becomes extremely complicated, and the expected effects in terms of 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.

+1 In view of the above-mentioned purpose, the present invention provides a punch that applies a pushing force into the die hole (2) on two or more thin metal plates (la) (lb) -- which are suspended together. (3), and a thin metal plate (
la) A die body (4) that causes swaging deformation in (lb)-, and a stationary pressure receiving surface (5) that is integrally structured with the die body and has a constant height at the lower end of the die hole (2).
The die body (6) is constructed by fastening a plurality of movable die pieces (4a), (4b), etc. into an integral structure with a coil spring (7). The gist of item 4) is a thin metal plate welding device that is provided with a die hole diameter expanding mechanism that opens upward with a hinge pin (9) provided at its lower end as a pivot center.

Two or more thin metal plates (LA) (LB) are pressed together with a punch (3) and pushed into the die hole (2) formed at the upper end of the die body (4). It will be done. Thin metal plate (la) pushed into the die hole (2)
At the end of the downward stroke of the punch (3), the lower surface of the protruding portion (8) of (lb) is pressed against the stationary pressure receiving surface (5) formed at the upper end of the shaft-shaped pressure receiving member (6) and comes to rest.

In this state, the protruding portion expands in the radial direction of the die hole (2) against the tightening force of the coil spring (7) while reducing the laminated thickness by the additional downward stroke of the punch (3). . As a result, the metal sheet (la) (lb)
The protruding part (8) is swaged into an integral structure, and the metal i
The slopes (la> (lb) are firmly joined together.

Actual View 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 1) = a + 0.8 (tt + t2)
A plurality of movable die pieces (4a
) (4b) It is constituted by a die main body (4) consisting of --, 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 connected to a ram device (not shown) whose stroke can be adjusted in order to adjust the bonding strength between the thin metal plates (la) and (lb). The movable die piece (4
a) The lower end of the die body (4), which is formed by tightening (4b)- with a coil spring (7), is formed with a die hole diameter expanding mechanism that opens upward about the hinge pin (9). There is. At the lower end of each movable die piece (4a) (4b) constituting the die body (4),
When expanding the diameter of the die hole (2), the movable die piece (4a)
(4b) - Notch (10) so that they do not interfere with each other
is provided. 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 thin metal plates, such as cold rolled steel plates (
la) (lb) is a punch (3
) and 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)---- are not displaced in the radial expansion direction,
Therefore, the diameter of the die hole (2) does not change, and the punch (
When the pushing stroke of 3) increases further, the thin metal plate (
la) The pressure-receiving part (lb) bulges in the direction of pressure applied by the punch (3), forming a bottomed cylindrical protrusion (8) as shown in FIG. It is pushed into the die hole (2) formed in the upper end. After this,
The lower surface of the bottomed cylindrical protrusion (8) forms a stationary pressure receiving surface formed at the upper end of the shaft-shaped pressure receiving member (6) at the end of the downward stroke of the punch (3), as shown in FIG. (5)
It is pressed to a standstill. In this state, the protrusion (8) is further lowered by the punch (3) to increase the lamination thickness (1,
+12) to t3, while coil spring (7
) against the clamping force of the die hole (2). As a result, the protruding portions (8) of the metal thin plates (la) (lb) are swaged into an integral structure, and the two metal thin plates (la) (lb) are firmly joined.

At the final stage of the joining operation, the individual movable die pieces (4a) (4b) constituting the die body (4)---
- As seen in FIG. 4, as the protrusion (8) bulges in the radial direction, the protrusion (8) opens radially in an upwardly opened state with the hinge pin (9) as a pivot center. promotes crushing. After this, punch (3) as shown in Figure 5.
returned to its original position, and the above-mentioned thin metal plate (la) was joined.
The protrusion (8) of (lb) is expanded in diameter from the die hole (2).
) by pulling out two thin metal plates (la)
The joining operation of (lb) is completed.

After the protrusion (8) has been extracted, the die body (4) returns to its original shape by reducing its diameter around the hinge pin (9) by the elastic restoring force of the coil spring (7), and
Enters the preparation state for the next joining operation.

[Y] Four 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 adhesion has been found until now. 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 spring constant of the coil spring 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. A wide range of bonding conditions can be selected from a completely integrally bonded condition to a relatively strong bonded condition that allows mutual rotation between the thin metal plates about 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)--Dice hole, (3)--Punch, (4)--Die body, (5)-Static pressure receiving surface, (6') - Shaft-shaped pressure receiving member, (7) - Coil spring, (8) - Protrusion, (9) - Hinge bin, (
10) - Notch.

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. Consists of a die body and a shaft-shaped pressure receiving member that is integrally constructed with the die body and forms a stationary pressure receiving surface of a constant height at the lower end of the die hole, and a plurality of movable die pieces are fastened by coil springs. 2. A joining apparatus for joining thin metal sheets, wherein the die body is provided with a die hole diameter expanding mechanism that opens upward with a hinge pin provided at a lower end thereof as a pivot center.