JPH0254769B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of molding a rotary plate for mounting a turntable placed in a heating chamber of a cooking device.

Conventionally, this type of rotary plate, as shown in Fig. 1,
A pair of molds 4, 5 for anti-axial molding and axial molding are used to form a disc material 3 in which main resin flow holes 1 and sub-resin flow holes 2 are formed at approximately the center and at equal intervals in the circumferential direction around the center.
Resin is supplied from a resin supply passage 6 facing the main resin flow hole 1 formed in the mold 4 for anti-shaft molding, and passes through the main resin flow hole 1 and the auxiliary resin flow hole 2 for shaft molding. A molding method was adopted in which the resin flowed into the shaft mold hole 7 of the mold 5 and fixed the resin shaft to the disc material 3.

However, in the conventional method described above, since the diameter of the main resin flow hole 1 is considerably smaller than the diameter of the shaft-shaped hole 7 of the shaft fixed to the disk material 3, the differential pressure between the front and rear of the main resin flow hole 1 is In the worst case, the peripheral end of the main resin flow hole 1 may be deformed as shown by the dotted line.

The present invention has been made in view of the above points, and by making the diameter of the hole opened approximately at the center of the plate material, that is, the main resin flow hole, substantially the same as the axis fixed to the plate material, the main resin This problem is solved by reducing the pressure difference between the front and rear of the flow hole.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 and 3. Incidentally, the same elements as those in the conventional example are given the same reference numerals and the explanation thereof will be omitted. Reference numeral 11 denotes a resin shaft fixed to the disc material 3, that is, a main resin flow hole opened approximately at the center of the disc material 3 with approximately the same diameter as the inner diameter a of the shaft mold hole 7 of the mold 5 for molding the shaft; Reference numeral 12 denotes a hole opened in the disc material 3 for relaxing thermal stress.

When the disc material 3 having such a configuration is used, the resin supplied from the resin supply passage 6 formed in the mold 4 for anti-axial molding hardly collides with the periphery of the main resin flow hole 11 of the disc material 3. The resin passes approximately through the main resin flow hole 11 and flows into the shaft mold hole 7 of the mold 5 for shaft molding. When the entire shaft-shaped hole 7 is filled with resin, the resin supplied from the resin supply passage 6 collides with the resin and flows into both sides of the disc material 3, causing a fluid impact to the periphery of the main resin flow hole 7. Resin is supplied throughout with almost no force acting on it.

Therefore, the resin shaft can be fixed to the disc material 3 without deforming it.

As explained above, according to the present invention, the rotary plate for mounting the turntable placed in the heating chamber is
A plate material having resin flow holes at the center of the shaft and at multiple locations around the center is held between a pair of molds, and resin is supplied from a mold for anti-shaft molding toward the approximate center of the sheet material. In the method for molding a rotary plate of a heating cooker, the resin is supplied into a mold for molding a shaft through the resin flow hole, and a resin shaft is fixed and molded to the plate material, approximately at the center of the plate material. Since the diameter of the resin flow hole in the plate is made to be approximately the same as the inner diameter of the shaft mold of the mold for shaft molding, the supplied resin almost collides with the peripheral edge of the resin flow hole formed approximately at the center of the plate material. The resin can flow into the mold without causing any deformation of the plate, and the resin shaft can be fixed to the plate without deforming the plate.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional configuration diagram showing conventional rotary plate molding, FIG. 2 is a schematic cross-sectional configuration diagram showing rotary plate molding according to an embodiment of the present invention, and FIG. 3 is the same as above. It is a front view of a disk material. 2... Sub-resin flow hole, 3... Disc material, 4... Mold for anti-shaft molding, 5... Mold for shaft molding, 6...
Resin supply passage, 7... shaft-shaped hole, 11... main resin distribution hole.

Claims (1)

[Claims] 1. A rotary plate for mounting a turntable placed in a heating chamber is sandwiched between a pair of molds by a plate material having resin circulation holes at approximately the center and at multiple locations around the center, and anti-axially molded. Supplying resin from a mold for use toward the approximate center of the plate material, supplying the resin into the shaft molding mold through the resin flow hole, fixing the resin shaft to the plate material, and molding. A method for molding a rotary plate for a heating cooker, characterized in that the diameter of the resin flow hole in the approximate center of the plate material is approximately the same as the inner diameter of the shaft mold of the mold for molding the shaft. molding method.