Joining method, punch riveting device, die, and punch riveting tool

By combining rivets and collars, and applying radial forging force after stamping using the mating surface of the die, the problems of high axial force and insufficient strength in the prior art are solved, achieving a high-strength connection without the need for pre-drilling, which is suitable for workpieces made of a variety of materials.

CN122121964APending Publication Date: 2026-05-29NEWFREY LLC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NEWFREY LLC
Filing Date
2024-10-16
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing stamping riveting technology requires high axial force when connecting workpieces, and the strength of rivets without retaining rings is insufficient. It is particularly difficult to connect effectively when the accessibility of the joint is limited. In addition, traditional methods require pre-drilling, which limits the scope of application.

Method used

The combination structure of rivets and collars is adopted. The radial groove of the rivet is filled by the support of the collar and the combination of rotary forging force, avoiding pre-drilling. The radial rotary forging force is applied after the stamping step by utilizing the mating surface of the die, reducing the force required for connection.

Benefits of technology

It offers higher connection strength and security, reduces the force required for connection, eliminates the need for pre-drilling, and is suitable for a variety of materials and workpieces, including metals and composites.

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Abstract

A method for joining at least two workpieces (181, 182) using a stamping riveting device (20) comprising a rivet (22) and a collar (40), wherein the rivet (22) has at least one radial groove (28), comprising the steps of: (i) placing the rivet (22) on a first side (161) of a workpiece constituting a stacked workpiece assembly (16); (ii) placing the collar (40) on a die (14) arranged on a second side (162) of the workpiece assembly (16); and (iii) stamping the rivet (22) through the workpiece in the axial direction (L) with a stamping force (FP). The device (16) wherein the workpiece device (16) is supported by a support surface (46) of a collar (40), and wherein the collar (40) is supported by a first engagement surface (56) of a die (14); and (iv) the collar (40) is modified by applying a modification force (FM) to the collar (40), wherein the modification force (FM) is higher than the punching force (FP), and wherein the modification of the collar (40) allows the second engagement surface (58) of the die (14) to apply a radial forging force (FSr) to the collar (40), such that material of the collar (40) flows into at least one radial groove (28) of the rivet (22).
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