Connecting Rod Fracture Splitting with Cross-Direction Precompression
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Solution Overview
Problem
The existing methods for fracture splitting connecting rods into rod and cap portions often result in degraded surface properties due to ductile fracture, leading to reduced alignment accuracy.
Innovation Solution
A manufacturing method that applies precompression in a cross direction to the connecting rod, ensuring brittle fracture by restraining slip deformation during fracture splitting, thereby maintaining surface properties of the fracture surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ductile fracture with plastic deformation is used to split the connecting rod, then the fracture splitting is achieved, but the surface properties of the fracture surfaces are degraded
Solution Approach 1:
The patent applies precompression in the cross direction before performing the fracture splitting in the longitudinal direction. This preliminary action of precompression restrains slip deformation during the subsequent fracture process, ensuring that the fracture surfaces maintain their surface properties while still achieving the desired splitting effect.
Solution Approach 2:
The patent changes the stress state parameters by applying precompression in the cross direction, which alters the fracture mechanism from ductile fracture with plastic deformation to brittle fracture with minimal plastic deformation. This parameter change ensures that the fracture surfaces are not degraded while still achieving effective splitting.
2Manufacturing precision
If precompression is applied in the cross direction, then slip deformation is restrained and brittle fracture is ensured, but the device complexity increases
Solution Approach 1:
The patent separates the precompression application into distinct components: insertion members that apply precompression in the cross direction, and a separate mechanism that applies the tensile load in the longitudinal direction. This segmentation allows each component to perform its specific function efficiently without unnecessary complexity.
Solution Approach 2:
The insertion members act as intermediaries that transmit the precompression force from the precompression mechanism to the connecting rod in the cross direction. These intermediaries enable the complex precompression function to be achieved through simple, well-defined mechanical components.
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 ensures the surface properties of the fracture surfaces, enhancing the alignment accuracy of the rod and cap portions by promoting brittle fracture instead of ductile fracture.
Implementation Method 1
Applying a tensile load to the end portion of the connecting rod as precompression in the cross direction that intersects with the longitudinal direction of the connecting rod results in a state where a compressive load along the longitudinal direction of the connecting rod acts on the end portion
Implementation Method 2
fracture splitting the end portion into a rod portion of the connecting rod and a cap portion of the connecting rod by applying a tensile load to the end portion in the longitudinal direction
Data Source
AI summary
A manufacturing method for a connecting rod includes applying a tensile load to an end portion of the connecting rod as precompression in a cross direction that intersects with a longitudinal direction, the end portion being an longitudinal end portion of the connecting rod and having a through-hole, and fracture splitting the end portion into a rod portion and a cap portion by applying a tensile load to the end portion in the longitudinal direction in a state where the precompression is applied to the end portion.