Coil Spring Shot Peening Using Coating Film Feedback
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Solution Overview
Problem
The high cost of determining propelling conditions for shot media in coil spring manufacturing due to the expense of stress measuring devices limits the efficient application of shot peening treatments for enhancing fatigue strength.
Innovation Solution
A method involving forming a coating film on a coil spring, performing shot peening treatment, and visually checking for coating film remnants to adjust conditions such as propelling speed, material, and particle diameter until the film does not remain, thereby determining optimal propelling conditions without expensive equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a stress measuring device is used to determine propelling conditions for shot medium, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces expensive, complex stress measuring devices with inexpensive coating films that are applied to the coil spring surface. The coating film serves as a temporary, disposable indicator that is removed by shot medium impact, providing measurement information without requiring costly equipment. This resolves the contradiction by achieving functional equivalence through a low-cost alternative.
Solution Approach 2:
The patent utilizes coating films with distinct colors or visual characteristics that change state when removed by shot medium impact. The visual detection of coating film removal patterns provides measurement information about shot medium propelling conditions, replacing complex instrumental measurement with simple visual observation. This resolves the contradiction by enabling precise measurement through aesthetic/visual property changes.
2Manufacturing precision
If shot medium propelling speed is increased to ensure even collision coverage, then manufacturing precision is improved, but loss of energy increases
Solution Approach 1:
The patent employs a feedback mechanism where the coating film removal pattern is observed and used to adjust shot medium propelling conditions. By monitoring whether the coating film is uniformly removed, operators can iteratively adjust propelling speed and other parameters to achieve optimal uniformity. This feedback loop enables precise control of collision uniformity while minimizing energy waste by avoiding excessively high speeds from the outset.
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 approach allows for the inexpensive determination of propelling conditions that ensure even collision of shot media with the coil spring, enhancing fatigue strength and reducing manufacturing costs.
Implementation Method 1
performing a shot peening treatment of propelling the shot medium onto the coil spring where the coating film is formed
Implementation Method 2
forming a coating film on a surface of a coil spring
Data Source
AI summary
The invention relates to a method for manufacturing a coil spring and for determining a propelling condition for a shot medium. In a case where it is confirmed that the coating film remains in a third step, at least one or more of conditions of the shot peening treatment including a propelling speed of the shot medium, a propelling time of the shot medium, a material of the shot medium, and an average particle diameter of the shot medium are changed and the second step and the third step are repeated until the coating film does not remain. In a case where it is confirmed that the coating film does not remain in the third step, the condition of the shot peening treatment in the second step in which the coil spring is obtained with no remaining coating film is determined as the propelling condition for the shot medium.