Coil Spring End Forming Apparatus Pigtail Formation
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Solution Overview
Problem
Current coil spring end forming apparatuses are complex and require engaging structures for regulating movement, making it difficult to shorten the time from mounting to forming a pigtail portion, which hampers productivity.
Innovation Solution
A coil spring end forming apparatus using a pair of parallel rollers, a mandrel, a stopper, a clamp jig, and a pusher to form a pigtail portion without needing engaging structures for axial or radius direction movement regulation, allowing for efficient formation by positioning the mandrel between the rollers' axes and using a clamp portion to hold and rotate the spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If engaging structures are used to regulate movement of the semi-formed spring, then positioning accuracy is improved, but device complexity increases and productivity decreases
Solution Approach 1:
The semi-formed spring itself serves as the positioning element through its natural geometry. The spring's own structure provides the reference for positioning during pigtail formation, eliminating the need for external engaging structures that would add complexity to the device.
Solution Approach 2:
The patent removes the engaging structures for regulating movement from the device. By taking out these complex positioning mechanisms, the device becomes simpler while still achieving accurate pigtail formation through the spring's inherent geometric properties.
2Manufacturing precision
If engaging structures are used to regulate movement, then positioning control is improved, but time required for formation increases
Solution Approach 1:
The semi-formed spring's own geometry provides the positioning control needed for pigtail formation. This self-positioning capability eliminates time-consuming operations involving external engaging structures, thereby improving productivity while maintaining positioning accuracy.
3Manufacturing precision
If complex regulating mechanisms are used, then movement regulation is improved, but ease of operation deteriorates
Solution Approach 1:
By removing the complex regulating mechanisms for movement control, the device becomes easier to operate. The semi-formed spring's natural geometry takes over the regulation function, simplifying the operational process while maintaining precise movement control during pigtail formation.
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 reduces the time required for engaging structure movements, improves productivity by eliminating the need for complex regulation mechanisms, and allows for easy production of pigtail portions at various positions relative to the spring's axis, enhancing efficiency and versatility.
Implementation Method 1
a pair of parallel rollers rotated in the same direction on which is mounted a cylindrical coil shaped semi-formed spring
Implementation Method 2
a clamp portion which holds the end of the semi-formed spring
Implementation Method 3
a pusher that pushes the semi-formed spring toward the stopper on the parallel rollers
Implementation Method 4
a stopper that is provided coaxially and integrally with the mandrel and receives the one end of the semi-formed spring
Data Source
AI summary
A coil spring end forming apparatus is provided that includes a pair of horizontally disposed parallel rollers; a mandrel; a stopper that is provided adjacent to the circumferential surface of the mandrel and is moved up or down and rotated integrally with the mandrel; a clamp jig that is provided so as to be movable toward or away from the mandrel and that holds a semi-formed spring in cooperation with the mandrel, and a pusher for pushing the semi-formed spring toward the stopper, wherein in a state in which the axis of the mandrel is positioned between the axes of the parallel rollers and the semi-formed spring, a clamp portion holds the semi-formed spring at the inner side of a triangle formed by the axes of the parallel rollers and the semi-formed spring and rotates around the axis along the winding direction of the semi-formed spring to form a pigtail portion at one end of the semi-formed spring, and a coil spring end forming method is further provided.