JPH04237536A - Method for rivetting - Google Patents

Abstract

PURPOSE:To make the machining needless and to easily realize such structure as not to appear the rivet head on the front surface of the pallet by forming the seating surface for housing the head part of rivet simultaneously with piercing in the stepped form provided to the piece punch. CONSTITUTION:The seating surface 8 is formed at the upper part of the rivet hole 4 by pressurizing the press so that the bottom dead center of the press reaches the definite depth from the front surface 6 of the blank stock 1 at the time that rivet hole 4 is pierced with the stepped piercing punch 7 of the press. By the rivet 12 whose head shape 12a is the same as the seating surface 8 the other member 11 are tightened. At this time, the heat part 12a of the rivet 12 is positioned in the seating surface 8 and made to the flat surface shape so as no to project from the front surface 6 of the blank stock 1.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention involves forming a bearing surface for housing a rivet head at the same time as piercing a rivet hole in a blank material.
The present invention relates to a rivet fastening method in which the rivet head is not protruded from the seat surface when the rivet is fastened.

0002

2. Description of the Related Art Conventionally, for example, in a truck frame, a cross member is fastened to a flange surface of a side member using a rivet, and at this time, a fastening method is used in which the rivet head protrudes from the flange surface.

0003

[Problems to be Solved by the Invention] When fastening a rivet in the frame, the rivet head is fastened with the rivet head protruding from the flange surface, so the rivet head is covered by the joist on the flange surface, and furthermore, the rivet head is covered by the joist on the flange surface. The cargo platform will now be on board. Therefore, in the above-mentioned fastening method, the structure must take into consideration the escape of the protruding rivet head. Therefore, the design is cumbersome and the structure and assembly are complicated.

0004

[Means for Solving the Problems] The present invention involves forming a seat surface for housing the rivet head at the same time as piercing a rivet hole in a blank material, and when fastening the rivet to this seat surface, the rivet head protrudes. The present invention provides a rivet fastening method for fastening such that the rivet is not damaged.

[0005]

[Operation] The present invention punches a blank material 1 for a side member using a punch 2 for punching rivet holes and a button die 3, and also punches a stepped piercing punch on the outside of a portion corresponding to a loading platform to be placed on a flange surface 6 of a side member 5. 7 and pressurized to a certain depth to form a seat surface 8 on the top of the rivet hole 4. The blank material 1 with the seat surface 8 formed thereon is formed into a U-shape to form the side member 5. The head 1 is adapted to the seat surface 8 provided on the flange surface 6 of the side member 5 by combining the side member 5 configured in this way and the reinforcing plate 11 attached to the end of the cross member 9.
The rivet 12 having the rivet 2a is crimped by an upper snap 14a having a flat surface and a lower snap 14b having a concave shape attached to the riveter yoke 14. At that time, Rivet 1
The head 12a of 2 has a planar shape that does not protrude beyond the flange surface 6 on the seat surface 8, and the inside of the flange surface 6 has a lower snap 14b.
It is tightened by the molded head 12b which is molded in a concave shape.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the rivet fastening method according to the present invention, which will be explained below in accordance with the drawings. 1 is a cut blank material for a side member, and a required number of rivet holes 4 are punched out using a rivet hole punch 2 and a button die 3 applied to the blank material 1.

Furthermore, when the blank material 1 is bent and formed into a U-shape to form the side member 5, a rivet hole 4 is formed by pressing with a stepped piercing punch 7 in a portion corresponding to the outside of the flange surface 6 on which the loading platform rests. At the same time as piercing, the flange surface 6 is pressurized to a certain depth at the bottom dead center of the press to form a seat surface 8 on the upper part of the rivet hole 4.

Further, the blank material 1 on which the seat surface 8 has been formed is bent into the above-mentioned U shape to form the side member 5. The side member 5 has a seat surface 8 inserted into the rivet hole 4 formed in the seat surface 8 of the flange surface 6 of the side member 5 so as to be combined with the reinforcing plate 11 attached to the end of the cross member 9 via a rivet 10. Rivet 12 having a head 12a similar to the shape
and also into the rivet holes 13 bored in the reinforcing plate 11. The rivets 12 inserted into the rivet holes 4 and 13 are crimped by an upper snap 14a having a flat surface and a lower snap 14b having a concave shape attached to the riveter yoke 14. At this time, the head 12a of the rivet 12 is located within the seat surface 8 and has a planar shape that does not protrude beyond the flange surface 6.

[0009]

[Effects of the Invention] As explained above, in the rivet fastening method of the present invention, in the rivet hole piercing process, the bearing surface for housing the rivet head is formed by a press using the stepped part provided on the piercing punch at the same time as the piercing. The rivet fastening process is characterized by fastening the rivet so that the rivet head does not protrude.As mentioned above, everything from piercing to forming the seat is done in one step, and the seat is press-formed. It requires no machining and is easy to work with.

Furthermore, in conventional rivet fastening, the rivet head protrudes from the flange surface of the frame, so it is necessary to design a design that takes into account the amount of rivet head protrusion. Since there is no need for a design that takes this consideration into consideration, the troublesomeness is eliminated. In addition, since it is possible to directly place the loading platform on the flange surface of the frame, the structure is simplified, which not only simplifies design and assembly, but also reduces the weight of the vehicle by eliminating parts.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a frame side member blank of the present invention.

FIG. 2 is a sectional view of the piercing process of the present invention.

FIG. 3 is a sectional view of the seat molding.

FIG. 4 is a perspective view of a blank material of a frame side member after being pierced.

FIG. 5 is a perspective view of the frame side member after molding.

FIG. 6 is an assembled perspective view of a side member, a cross member, and a reinforcing plate.

FIG. 7 is a cross-sectional view when a rivet is inserted.

FIG. 8 is a cross-sectional view of the rivet in a crimped state.

FIG. 9 is a sectional view after rivet crimping.

FIG. 10 is a perspective view of the side member, cross member, and reinforcing plate after riveting.

[Explanation of symbols]

1 Blank material for side member 2
Rivet hole punch 3 Button die 4 Rivet hole 5 Side member 6 Flange surface 7 Stepped earring punch 8 Seat surface 9 Cross member 10 Rivet 11 Reinforcement plate 12 Rivet 12a Rivet head 12b Rivet head 13 Rivet hole 14 Riveter yoke 14a Flat surface Upper snap 14b having a concave shape Lower snap 14b having a concave shape

Claims (1)

[Claims] Claim 1: In the rivet hole piercing process, a seating surface for housing the rivet head is press-formed at the same time as the piercing using a stepped part provided on the piercing punch, and the rivet head does not protrude from this seating surface during the rivet fastening process. A rivet fastening method characterized by fastening.