Induction Coil Layout in Spinning Forming to Prevent Plate Contact
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Solution Overview
Problem
Conventional spinning forming devices face challenges in preventing the plate and heater from contacting each other, particularly due to deformation of the peripheral edge portion of the plate, which can lead to contact with the heater's lead portions or core during the spinning forming process.
Innovation Solution
The spinning forming device employs a receiving jig to support the central portion of the plate, with a front-side heater using an electric conducting pipe having a doubled circular-arc coil portion and cores that collect magnetic flux, and lead portions are designed to retract from the plate to prevent contact, ensuring a non-contact state between the plate and heater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the plate is heated by induction heating during spinning forming, then the plate can be transformed into a final shape in the atmosphere without using the mandrel, but the plate and heater may contact each other causing deformation issues
Solution Approach 1:
The patent introduces a receiving jig that supports the plate from below while the heater operates from above, creating a vertical separation that prevents contact between the plate and heater during the spinning forming process
Solution Approach 2:
The receiving jig acts as an intermediary between the plate and the heating system, providing structural support and maintaining the plate in a stable position while allowing the heater to operate independently without direct contact
2Productivity
If the peripheral edge portion of the plate deforms during spinning forming, then the plate may contact the heater's lead portions or core, but preventing this contact requires additional structural constraints
Solution Approach 1:
The patent employs a receiving jig with a structure that can accommodate plate deformation while maintaining support, allowing the system to handle peripheral edge deformation without requiring overly complex rigid constraints
Solution Approach 2:
The heater is designed with separate functional components (coil portion, cores, lead portions) that can be independently positioned and configured, allowing the lead portions to be retracted or positioned away from the plate while maintaining heating effectiveness
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 configuration effectively prevents the plate's peripheral edge from contacting the heater, maintaining a non-contact state and ensuring accurate shaping without deformation-related issues, allowing for efficient spinning forming without mandrel pressure.
Implementation Method 1
a front-side heater that locally heats the transform target portion by induction heating
Implementation Method 2
the electric conducting pipe including a coil portion
Implementation Method 3
a cooling liquid flows through the electric conducting pipe
Implementation Method 4
a first core covering an inner circular-arc portion of the coil portion from an opposite side of the plate, and a second core covering an outer circular-arc portion of the coil portion from the opposite side of the plate
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The spinning forming device (11) according to the invention comprises a receiving jig (22) supporting a central portion of a plate (9) to be formed; a rotating shaft (21) to which the receiving jig is attached; a processing tool (8) that presses a transform target portion of the plate to transform the plate; and a front-side heater (5) that locally heats the transform target portion by induction heating and is disposed at a same side as the processing tool relative to the plate, wherein: the front-side heater includes an electric conducting pipe in which a cooling liquid flows, the electric conducting pipe including a coil portion (54), the coil portion extending in a circumferential direction of the rotating shaft and having a doubled circular-arc shape facing the plate, a first core (57) covering an inner circular-arc portion of the coil portion from an opposite side of the plate, and a second core (58) covering an outer circular-arc portion of the coil portion from the opposite side of the plate; and at least a part of an inner wall portion (57a) of the first core (57) has a shape that tapers toward a tip end of the inner wall portion, the inner wall portion being located at a radially inner side of the inner circular-arc portion, or at least the part of the inner wall portion of the first core is thinner than an outer wall portion of the first core, the outer wall portion being located at a radially outer side of the inner circular-arc portion.