초록 ▼

A self-piercing rivet setting apparatus (9) comprises a punch (14) and a die (18) for driving a self-piercing rivet into a plurality of workpieces including a receiving-side workpiece adjacent to the die. The self-piercing rivet has a large-diameter head and a hollowed leg. The leg is driven to pier

A self-piercing rivet setting apparatus (9) comprises a punch (14) and a die (18) for driving a self-piercing rivet into a plurality of workpieces including a receiving-side workpiece adjacent to the die. The self-piercing rivet has a large-diameter head and a hollowed leg. The leg is driven to pierce the workpieces while allowing the front end of the leg to be expanded and deformed in its radial outward direction and to be stayed in the receiving-side workpiece without passing therethrough, to connect the plurality of workpieces with each other by the expanded leg and the head. The die includes a first die member (26) having a first cavity (25), and a second die member (30) having a second cavity (27) and a protruding pin (29) provided at the center of the second cavity. The first cavity is adapted to allow the leg of the self-piercing to be driven into the workpieces in a straight direction when the self-piercing rivet is pressed by the punch (14). The second cavity and the protruding pin are adapted to allow the leg of the self-piercing rivet being piercing the workpieces to be expanded and deformed in its radial outward direction.

대표청구항 ▼

1. A self-piercing rivet setting apparatus comprising a punch and a die for driving a self-piercing rivet into a plurality of workpieces including a receiving-side workpiece adjacent to the die, the self-piercing rivet having a large-diameter head and a hollowed leg extending from the head, wherein

1. A self-piercing rivet setting apparatus comprising a punch and a die for driving a self-piercing rivet into a plurality of workpieces including a receiving-side workpiece adjacent to the die, the self-piercing rivet having a large-diameter head and a hollowed leg extending from the head, wherein when the self-piercing rivet is driven into the workpieces, the leg is driven to pierce the workpieces while allowing the front end of the leg to be expanded and deformed in its radial outward direction and to be stayed in the receiving-side workpiece adjacent to the die without passing therethrough to connect the plurality of workpieces with each other by the expanded leg and the head; andwherein the die includes a first die member having a first cavity, and a second die member having a second cavity and a protruding pin provided at the center of the second cavity, the first cavity being adapted to allow the leg of the self-piercing rivet to be driven into the workpieces in a straight direction when the self-piercing rivet is pressed against the first die member by the punch, and the second cavity and protruding pin of the second die member being adapted to allow the leg of the self-piercing rivet being piercing the workpieces to be expanded and deformed in its radial outward direction. 2. The apparatus as defined in claim 1, wherein the first die member is disposed at a position facing with the punch until the leg of the self-piercing rivet is driven into the workpieces in a straight direction and starts piercing the receiving-side workpiece adjacent to the first die member, and the second die member is disposed at the position facing with the punch in place of the first die member to allow the leg of the self-piercing rivet being piercing the receiving-side workpiece to be expanded and deformed in its radial outward direction when the leg of the self-piercing rivet starts piercing the receiving-side workpiece.3. The apparatus as defined in claim 2 further including a C-shaped frame, wherein the punch is attached to one of the ends of the C-shaped frame to be movable toward the other end of the C-shaped frame, and the first and second die members are attached to the other end of the C-shaped frame, and wherein the other end of the C-shaped frame is provided with a rotary table for supporting the first and second die members, the rotary table being operable to allow either one of the first and second die members to be selectively positioned at the position facing with the punch so as to receive the self-piercing rivet to be driven by the punch.4. The apparatus as defined in claim 1, which includes a plurality of die members to be replaceably used as at least one of the first and second die members, depending on a piercing depth of the leg of the self-piercing rivet with respect to the workpieces.5. A self-piercing rivet setting system having self-piercing rivet setting apparatuses each including a punch and a die for driving a self-piercing rivet into a plurality of workpieces having a receiving-side workpiece adjacent to the die, the self-piercing rivet having a large-diameter head and a hollowed leg extending from the head, wherein when the self-piercing rivet is driven into the workpieces, the leg is driven to pierce the workpieces while allowing the front end of the leg to be expanded and deformed in its radial outward direction and to be stayed in the receiving-side workpiece adjacent to the die without passing therethrough to connect the plurality of workpieces with each other by the expanded leg and the head; andwherein the self-piercing rivet setting system comprises a first self-piercing rivet setting apparatus including a first die which has a first cavity, the first cavity of the first die member being adapted to allow the leg of the self-piercing rivet to be driven into the workpieces in a straight direction when the self-piercing rivet is pressed against the first die by the punch; a second self-piercing rivet setting apparatus including a second die which has a second cavity and a protruding pin provided at the center of the second cavity, the second cavity and protruding pin of the second die member being adapted to allow the leg of the self-piercing rivet being piercing the workpieces to be expanded and deformed in its radial outward direction; and exchanging means for placing the first self-piercing rivet setting apparatus with respect to the workpieces until the leg of the self-piercing rivet is driven into the workpieces in a straight direction and starts piercing the receiving-side workpiece, and for placing the second self-piercing rivet setting apparatus with respect to the workpiece in place of the first self-piercing rivet setting apparatus to allow the leg of the self-piercing rivet being piercing the receiving-side workpiece to be expanded and deformed in its radial outward direction when the leg of the self-piercing rivet starts piercing the receiving-side workpiece.