JPH11197765A - Die for joining sheet materials and joining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the joining of sheet materials without damaging the coating material on the surface by arranging plural enlarging members fitted to a die on the outer periphery of the die body and shifting so as to be freely opened/ closed outwards in the horizontal direction without shifting in the axial direction and pressing one pair of sheet materials with a punch and the die. SOLUTION: One pair of metallic sheet materials 6, 7 are laid on the tip surface of the enlarging members 2. The punch 4 is lowered to form recessed parts in the sheet materials 6, 7. Further, the punch is lowered. Then, the bottom parts of the recessed parts are thinned and the material is shifted to the peripheral edge. At this time, the enlarging part 2 is shifted outward in the radial direction. The enlarge-deformed part is formed in the peripheral edge in the bottom part of the recessed part and the sheet materials 6, 7 are prevented from getting out and fixed. The punch 4 is elevated and separated from the sheet materials 6, 7 to complete the joining of the sheet materials 6, 7. It is desirable that an annular elastic body 3 is fitted on the outer periphery of the enlarging part material 2 so as to energize the enlarging member 2 in the axial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining die for securely joining two metal plates by press working and a joining apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, metal parts such as spot welding and rivets have been used to partially join two metal plates.

[0003]

When two metal plates are joined by spot welding or the like, sparks and noise are involved, and there is a disadvantage that the working environment is deteriorated. In addition, when metal fittings such as rivets are used, since a through hole is formed in a pair of metal plates, there is a possibility that water leakage or air leakage may occur from the through hole. Further, in any case, there is a possibility that the coating material for rust prevention on the surface of the metal plate is damaged. Accordingly, it is an object of the present invention to provide a joining die and a joining device for partially joining a pair of metal plates by a press that does not generate a through-hole, eliminating these drawbacks.

[0004]

According to the present invention, a die for bonding a sheet material includes a die body 1 arranged to face a punch 4.
And the tip surface 2a is slightly fitted to the outer periphery of the die body 1 in the axial direction slightly more than the tip surface 1a of the die body 1.
And a plurality of expanding members 2 which are opened and closed radially outward without moving in the axial direction with respect to the die body 1. According to this joining die, when the pair of sheet members 6 and 7 are pressed by the punch 4 and sandwiched between the punch 4 and the expanding member 2 to be crushed and deformed, the crushed portions are radially crushed by crushing. Is allowed to move, and the plurality of expanding members 2 move outward in the radial direction, so that the bottom peripheral edge depressed by the press moves in the circumferential direction to form an expanding deformation portion 11 therein. As a result, the two sheet members 6 and 7 are joined together to prevent them from coming off.

[0005] Next, according to a second aspect of the present invention, in the first aspect, an annular elastic body 3 is fitted on the outer periphery of the plurality of expanding members 2 so that each expanding member 2 extends in the axial direction. This is a joining die for the energized sheet material. According to this joining die, since each of the expanding members 2 is urged by the annular elastic body 3, the expanding members 2 are held before the crushing step, whereby the pair of sheet members 6, 7 , A recess can be formed. Further, after all the processes by crushing are completed, a joining die with good workability can be formed which can automatically return the expanding member 2 moved radially outward to the center side with a simple structure.

Next, a sheet material joining apparatus according to the present invention is provided with a punch 4 disposed opposite to a tip of a sheet material joining die according to claim 1, and fitted around an outer periphery of the punch 4. Punch housing 5 for sandwiching a pair of sheet members 6 and 7 between tip surface 5a and tip surface 2a of expanding member 2
And a spring 8 for urging the punch housing 5 in the axial direction. The punch housing 5 is provided with the sheet material 6, 7 before the punch 4 contacts the sheet material 6, 7.
Is pressed and held between the expanding member 2 and the held state is maintained even when the punch 4 separates from the die body 1.

According to this joining apparatus, since the punch 4 presses and holds the sheet members 6 and 7 by the punch housing 5 and the expanding member 2 before contacting the sheet members 6 and 7, the punch 4 surely holds the sheet members 6 and 7 together. A recess can be formed. When the pair of sheet members 6 and 7 are crushed by the tip of the punch 4 and the die body 1, the plurality of expanding members 2
Can be radially outwardly expanded, and an expanded deformation portion 11 is formed at the bottom peripheral edge of the concave portion, so that the pair of sheet materials 6 and 7 can be joined and prevented from falling off. Then, when the punch 4 is separated from the die body 1 after the joining, since the two sheet materials 6 and 7 are sandwiched, the concave portion does not deform when the punch 4 is removed.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a die for joining sheet materials according to the present invention, FIG. 2 is a plan view showing an assembled state thereof, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIG. FIG. 5 is a longitudinal sectional view showing a first step of the sheet material joining apparatus, FIG. 5 is a longitudinal sectional view showing the second step, and the punch housing 5 is omitted, and FIG. FIG. As shown in FIG. 6, this sheet joining device partially joins a pair of sheet materials 6 and 7 made of a pair of metal plates, and a concave portion is formed in the pair of sheet materials 6 and 7 in an overlapped state. The sheet material 6, 7 is securely fixed to the sheet members 6 and 7 by forming the expanded deformed portion 11 by plastically deforming the bottom of the sheet material 12 radially outward.

FIG. 1 shows a die for joining sheet materials for this purpose.
3 is configured as shown in FIG. That is, in this example, the base 1
The die main body 1 is integrally protruded and fixed on the base b. The die body 1 has a truncated cone and a short column. An annular groove 13 is formed between the truncated cone and the base 1b as shown in FIG. In this example, three expanding members 2 are fitted on the outer periphery of the die body 1. Each of the expanding members 2 is aligned with the outer periphery of the die body 1 and is attached within a range of 120 ° around the outer periphery thereof.
As a result, the entire outer periphery of the die main body 1 is fitted, and the entire die body 1 has an inverted funnel shape. A protruding portion 2 b is protruded from the inner peripheral edge of the lower end of the expanding member 2 and fits into the annular groove 13 of the die body 1. Further, the outer peripheral surface of the expanding member 2 is formed in a truncated cone shape, and flange portions are protrudingly provided on outer peripheries at both upper and lower ends in the axial direction.

An annular elastic body 3 made of a rubber material is fitted between the flange portions, and urges the three expanding members 2 toward the axis. The axial length of the expanding member 2 is formed larger than that of the die main body 1, and the front end surface 2 a protrudes above the front end surface 1 a of the die main body 1. Next, FIG.
As shown in FIG.
Is disposed. The diameter of the punch 4 is smaller than that of the tip surface 1 a of the die body 1. The punch 4 is provided inside the punch housing 5 so as to be vertically movable. The punch housing 5 and the punch 4 are respectively attached to a punch body (not shown) so as to be vertically movable. Further, a spring 8 is provided between the punch housing 5 and the punch body via a spring seat 9, thereby biasing the punch housing 5 downward. When the diameter of the punch 4 is changed, the spring seat 9 also needs to be changed.

[0011]

Next, a description will be given of a method of joining a pair of sheet materials 6 and 7 using such a joining die for sheet material and a joining apparatus. First, a pair of metallic sheet materials 6 and 7 are placed on the distal end surface 2a of the expanding member 2, and the start button of the present apparatus is turned on. Then, first, the punch housing 5 descends to sandwich the pair of sheet materials 6 and 7 as shown in FIG. At this time, the punch 4 is in an upper position. Next, the punch 4 descends to form a concave portion 12 in the pair of sheet materials 6 and 7. When the punch 4 further descends, the sheet materials 6 and 7 at the bottom of the concave portion 12 have a small thickness and are plastically deformed, and the material moves correspondingly to the bottom periphery. At this time, the respective expanding members 2 move radially outward. Then, as shown in FIG.
Is formed, whereby the pair of sheet members 6 and 7 are prevented from falling off and fixed. Next, the punch 4 moves up. At this time, the punch housing 5 is at the position shown in FIG. As a result, as the punch 4 rises, the sheet material 6, 7
There is no danger of being lifted. The punch 4 is separated from the sheet materials 6 and 7. Thus, the joining of the pair of sheet materials 6 and 7 is completed.

[0012]

According to the sheet material joining die and the joining apparatus of the present invention, the punch 4 has a pair of sheet materials 6 and 6.
Until the sheet 7 is pressed and reaches the tip end surface 1a of the die body 1, the sheet members 6, 7 are restrained by the plurality of expanding members 2, and they are deformed by depression. Next, when the punch 4 further approaches the distal end surface 1a of the die body 1, the pair of sheet materials 6 and 7 are pinched and crushed between them, and the crushed portion moves in the circumferential direction. At this time, since the expanding member 2 is configured to expand outward in the radial direction, the expanding deformation portion 11 is formed at the inner peripheral edge of the bottom of the sheet materials 6 and 7, and the pair of sheet materials 6 and 7 is removed. Stopped and fixed. Thus, the two metal sheet materials 6 and 7 are joined by pressing. Moreover, since the sheet material is not penetrated without using a rivet or the like, there is no occurrence of water leakage or air leakage. In addition, unlike spot welding, it does not generate sparks, noise, etc.
The working environment can be kept clean.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a die for joining sheet materials according to the present invention.

FIG. 2 is a plan view showing an assembled state of the die.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a longitudinal sectional view showing a first step of the sheet material joining apparatus of the present invention.

FIG. 5 is a longitudinal sectional view showing the second step, in which the punch housing 5 is omitted.

FIG. 6 is a cross-sectional perspective view of a joined portion joined by the sheet material joining apparatus of the present invention.

[Explanation of symbols]

 Reference Signs List 1 die body 1a distal end surface 1b base 2 expanding member 2a distal end surface 2b convex portion 3 annular elastic body 4 punch 5 punch housing 5a distal end surface 6,7 sheet material 8 spring 9 spring seat 11 expanding deformation portion 12 concave portion 13 annular Groove

Claims (3)

[Claims] 1. A die body 1 disposed to face a punch 4 and a distal end surface 2a which is fitted on the outer periphery of the die body 1 and is slightly axially smaller than a distal end surface 1a of the die main body 1. And a plurality of expanding members 2 which are protrudingly provided, and are opened and closed radially outward without moving in the axial direction with respect to the die body 1. 2. The sheet joining device according to claim 1, wherein an annular elastic body is fitted on the outer periphery of the plurality of expanding members, whereby each expanding member is urged in the axial direction. Die. 3. A punch 4 disposed opposite to a tip of the bonding die for sheet material according to claim 1; The punch housing 5 includes a pair of sheet members 6 and 7 sandwiched between the front end surface 2a and a spring 8 for urging the punch housing 5 in the axial direction.
Before contacting the sheet materials 6,7,
And a sheet material joining device configured to hold the pressing member between the die member 1 and the pressing member while pressing the pressing member with the expanding member 2.