Multi-Stage Forging Apparatus for Self-Piercing Nut Uniformity
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Solution Overview
Problem
Current methods for producing self-piercing and clinch nuts lack efficiency in forming uniform flanges and ribs, leading to inconsistent securing strength and flatness of the nut's outer surfaces.
Innovation Solution
The apparatus employs a multi-stage forging process using three forging die assemblies and a transfer mechanism, with each stage forming specific features such as flanges, ribs, and a through hole, ensuring uniform thickness and flatness by controlling the movement and pressure of punches and pins within defined processing spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-stage forging process is used, then the manufacturing process is simple, but the uniformity of flange thickness and rib formation is poor
Solution Approach 1:
The forging process is divided into three distinct stages: first forging to form flanges, second forging to form ribs, and third forging to form the through hole. Each stage uses dedicated dies and processing parameters optimized for that specific feature, enabling precise control over flange thickness uniformity and rib formation while maintaining a systematic manufacturing approach.
2Manufacturing precision
If multi-stage forging is used, then the uniformity of flange thickness and rib formation is improved, but the device complexity increases
Solution Approach 1:
The three forging operations are integrated into a single press through a transfer mechanism that moves the workpiece between different die assemblies. The controller coordinates all three stages automatically, combining multiple complex operations into one unified device that achieves high precision without requiring separate machines or manual repositioning.
3Productivity
If conventional forging is used, then the production process is fast, but the securing strength is inconsistent
Solution Approach 1:
Each forging stage applies localized pressure and deformation control specific to the feature being formed. The first stage optimizes flange thickness distribution, the second stage controls rib geometry and engagement, and the third stage creates the through hole. This localized control ensures consistent material flow and deformation, resulting in uniform securing strength across all produced nuts while maintaining high production speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process enhances the securing strength of the self-piercing and clinch nuts by ensuring uniform thickness and flatness of the flanges and pilot portion, improving their overall performance.
Implementation Method 1
clamping the blank in the first processing space by the first pin and the first punch so as to preliminarily form the pilot portion from part of the blank that is pressed from the first movement hole side to the first fitting hole side
Implementation Method 2
the blank is clamped by the second pin and the second punch and the second die is moved relative to the second pin in the second movement direction so as to press the ribs, which have been formed in the first clamping step, into the second processing grooves
Implementation Method 3
an inner surface of the third die that faces the third fitting hole, and a terrace surface of the fourth punch side press the pilot portion and the ribs so as to flatten an end surface of the pilot portion on the terrace surface side and to incline outer surfaces of the pilot portion
Data Source
AI summary
An apparatus to produce a self-piercing and clinch nut includes a first forging die assembly, a second forging die assembly, a third forging die assembly, a transfer mechanism, and a controller. The first forging die assembly subjects a blank to first processing. The second forging die assembly is adjacent to the first forging die assembly, and subjects the blank, which has undergone the first processing in the first forging die assembly, to second processing. The third forging die assembly is adjacent to the second forging die assembly, and subjects the blank, which has undergone the second processing in the second forging die assembly, to third processing. The transfer mechanism transfers the blank between two adjacent forging die assemblies among the first to third forging die assemblies. The controller controls operations of the first to third forging die assemblies and the transfer mechanism.