Spinning forming device

A spinning forming device comprising:

• a receiving jig supporting a central portion of a plate to be formed;
• a rotating shaft to which the receiving jig is attached;
• a processing tool that presses a transform target portion of the plate to transform the plate;
• and
• a front-side heater 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, the coil portion extending in a circumferential direction of the rotating shaft and having a doubled circular-arc shape facing one surface of the plate,
• a first core opposing the one surface and covering an inner circular-arc portion of the coil portion from a side of the coil portion opposite to the one surface of the plate, and
• a second core opposing the one surface and covering an outer circular-arc portion of the coil portion from the side of the coil portion opposite to the one surface of the plate;
• and
• at least a part of an inner wall portion of the first core 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 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.

A spinning forming device comprising:

• a receiving jig supporting a central portion of a plate to be formed;
• a rotating shaft to which the receiving jig is attached;
• processing tool that presses a transform target portion of the plate to transform the plate;
• a rear-side heater that locally heats the transform target portion by induction heating and is disposed at an opposite side of the processing tool across the plate;
• and
• a front-side heater that locally heats the transform target portion by the induction heating and is disposed at a same side as the processing tool relative to the plate, wherein:
• each of the rear-side heater and the front-side heater includes an electric conducting pipe in which a cooling liquid flows;
• the electric conducting pipe includes
• a coil portion extending in a circumferential direction of the rotating shaft and having a doubled circular-arc shape facing the plate and
• a pair of lead portions extending from the coil portion outward in a radial direction of the rotating shaft;
• a position of a center of the coil portion of the front-side heater is displaced from a position of a center of the coil portion of the rear-side heater outward in the radial direction of the rotating shaft by a predetermined distance;
• and
• a formula “0.5S ≤Ru −Rb ≤1.5S” is satisfied, where S denotes the predetermined distance, Ru denotes a curvature radius of the center of the coil portion of the front-side heater, and Rb denotes a curvature radius of the center of the coil portion of the rear-side heater.

A spinning forming device comprising:

• a receiving jig supporting a central portion of a plate to be formed;
• a rotating shaft to which the receiving jig is attached;
• a processing tool that presses a transform target portion of the plate to transform the plate;
• a front-side heater 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;
• a rear-side heater that locally heats the transform target portion by the induction heating and is disposed at an opposite side of the processing tool across the plate;
• an axial direction movement mechanism that moves the front-side heater and the rear-side heater in an axial direction of the rotating shaft;
• a first radial direction movement mechanism that moves the rear-side heater in a radial direction of the rotating shaft;
• and
• a second radial direction movement mechanism that moves the front-side heater in the radial direction of the rotating shaft at a speed higher than a speed at which the rear-side heater moves, wherein
• each of the front-side heater and the rear-side heater includes
• an electric conducting pipe in which a cooling liquid flows, the electric conducting pipe including a coil portion, 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 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.