JPS6014477B2 - Manufacturing method of spiral sheathed heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a heating cooker that processes a sheathed rice cake into a spiral shape, presses one side of it to form a flat part, and then reloads a pot or the like on the flat part. This invention relates to a method of manufacturing a spiral sheathed heater used as a heating element, and in particular, it is intended to easily produce a spiral sheathed heater with stable quality at low cost.

Examples of the present invention will be described in detail below.

In FIGS. 1 and 2, 1 is a sheathed heater.

2 is a mold, which has a convex portion 3 in the center, a sheathed heater end insertion hole 4 and a pin insertion hole 5 at the winding end position.
has.

6 is a roller urged in the direction toward the convex portion 3.

Next, to explain the order of molding the sheathed heater 1 into a spiral shape using this mold, first, to explain the order of molding the sheathed heater 1 into a spiral shape, first, bend the end of the sheathed heater 1 in a substantially right angle direction, This bent end is inserted into the insertion hole 4.

After this, the mold 2 is rotated while pressing the roller 6 against it.
At this time, the sheathed heater 1 is wound around the convex portion 3 at the initial stage of rotation of the mold 2. After that, it is divided into a plurality of parts with a curvature corresponding to a predetermined winding interval, and each part has a substantially semicircular shape.
is attached to the outside of the sheathed heater 1, and the heater 1 is pressed against the outer periphery of the sheathed heater 1 with a roller 6, and the mold 2 is rotated. After winding around the outer periphery of the smoother 6, the smoother 8 is then attached.In this way, the smoothers are sequentially attached to perform spiral processing. When this spiral processing is completed, the pin 9 is inserted into the insertion hole 5 of the mold 2, and the other end of the sheathed heater small is pressed so that the spiral shape of the sheathed heater does not return.

Next, the biasing roller 6 is removed, the heater 1 is energized, and the pipe of the sheathed heater 1 is heat-treated to red heat in order to remove the residual stress generated due to the spiral processing. After cooling, the pin 9 is removed and the spiral shaped heater is removed from the mold 2 to complete the process. Therefore, the present invention uses a smoother having a curvature corresponding to a predetermined spiral spacing, and rotates the mold while pressing a heater against the smoother with a roller to form a spiral. After the spiral is completed, the roller 9 If the heater 1 is removed, the stress generated during processing remains in the heater 1, so it will return like a spring; however, after the attachment is completed, insert the pin 9 into the hole 5 provided in the mold 2 to prevent the spiral from returning. Therefore, the residual stress is removed by applying a weak electric current to the heater 1 and making it red hot, so that even if the pin 9 is subsequently removed, the spiral shape will not expand or collapse, and there is no need to correct the problem in the subsequent process. ,
Stable quality can also be obtained.

Note that the heater may be energized while the mold 2 is mounted on the rotary table, but if multiple molds 2 are prepared and the energization work is performed separately by removing them from the rotary table, it is possible to perform the energization work in parallel with the spiral machining. If carried out in this way, it can be carried out efficiently, and the same effect can be obtained even if the heat treatment is carried out in a conveyor furnace or a batch furnace.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view at the beginning of the manufacturing process for a sheathed machine, and FIG. 2 is a plan view at the end of the same manufacturing process. In addition, in the figure, 1 is a sheathed heater, 2 is a mold, 3 is a convex part, and 4
5 indicates an insertion hole, 6 indicates a loaf, 7 and 8 indicate a spacer, and 9 indicates a pin. Key figure Tanomasu

Claims (1)

[Claims] 1 Using a rotary mold that has a convex part in the center that serves as a winding start guide and a sheathed heater end insertion hole, insert the end of the sheathed heater into the insertion hole, and press the convex with a roller biased in the direction of the convex part. Bend the sheathed heater along the curve, attach a spacer corresponding to the winding interval of the sheathed heater to the outside of the winding start of the bent sheathed heater, and press the sheathed heater against the outer periphery of the spacer with the roller. A spiral sheathed heater characterized in that after the sheathed heater is formed into a spiral shape by sequentially performing the following steps, the other end of the winding end of the sheathed heater is supported in the mold, and then the sheathed heater is heat-treated by being energized. manufacturing method.