Nested Riveting Structure for Smooth Workpiece Fixation

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Solution Overview

Problem

The existing riveting structures produce containments and pollutants on the outer surface of the rivet sleeve, making it difficult to achieve a smooth finish when combining workpieces.

Innovation Solution

The proposed riveting structure involves a first and second riveting member with coaxial head and riveting portions, where the second riveting member extends into a blind riveting hole of the first member, forming a receiving chamber and expanding the riveting portion to create an interference fit with the workpieces, ensuring a secure and smooth fixation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a traditional rivet sleeve with resisting portion is used, then the workpieces can be fixed together securely, but containments and pollutants are produced on the outer surface making it difficult to achieve a smooth finish

Engineering Contradiction:

Improvesurface finish qualityVSAvoidcontainments and pollutants on outer surface

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The riveting system is divided into two separate members: a first riveting member that passes through both workpieces, and a second riveting member that is inserted into a blind riveting hole of the first member. This segmentation allows the expansion action to occur internally within the blind hole, preventing surface contaminants from being generated on the outer surface of the visible rivet head.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second riveting member is nested within the first riveting member during the riveting process. The second member is inserted into the blind riveting hole of the first member, and its expansion occurs inside this nested structure. This nesting arrangement contains the expansion action and prevents the generation of surface pollutants that would otherwise occur with traditional single-piece rivet sleeves.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Strength

If the rivet core pulling rod breaks to form a flared portion, then the workpieces are fixed together, but the breaking process generates containments and pollutants

Engineering Contradiction:

Improvefixation strengthVSAvoidcontainments from breaking process

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The harmful breaking process is extracted and relocated from the visible outer surface to an internal blind hole. The second riveting member's expansion occurs inside the blind riveting hole of the first member, separating the strength-generating action from the surface finish area. This extraction eliminates the generation of containments on the outer surface while maintaining the necessary fixation strength.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The blind riveting hole acts as an intermediary space that contains the expansion action. By providing this intermediate cavity, the system allows the second riveting member to expand and create the necessary fixation strength without directly impacting the outer surface quality. The intermediary space captures all breaking debris and contaminants.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If a single rivet sleeve with resisting portion is used, then the structure is simple, but the outer surface cannot achieve a smooth finish due to containments

Engineering Contradiction:

Improveriveting structure simplicityVSAvoidouter surface smoothness

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The solution moves the expansion action from a two-dimensional surface level to a three-dimensional internal space. By utilizing the blind riveting hole as an internal cavity, the system performs the riveting function in a different spatial dimension, away from the critical surface finish area. This dimensional transition allows for better surface quality without significantly increasing overall structural complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 method effectively secures the workpieces together while minimizing surface contaminants, resulting in a smoother finish and improved assembly quality.

Implementation Method 1

expanding the riveting portion to create an interference fit with the workpieces

Methodology Applied

Scientific EffectInterference fit: Friction

Data Source

PatentUS8764363B2Riveting structure and riveting method for combining two workpieces

Publication Date: 2014.07.01 SHENZHENSHI YUZHAN PRECISION TECH CO LTD

AI summary

A riveting structure includes a first workpiece defining a first fixing hole, a second workpiece defining a second fixing hole, a first riveting member and a second riveting member. The first riveting member includes a first head portion and a first riveting portion, the first riveting member defines a riveting hole on the first riveting portion, the first riveting portion extends into the second fixing hole and the first fixing hole. The second riveting member includes a second head portion and a second riveting portion. The second riveting portion extends into the riveting hole of the first riveting member in an interference fit, such that the first workpiece and the second workpiece are fixed together, a receiving chamber is formed between the second head portion and the first riveting portion. The present invention further discloses a riveting method thereof.