Induction heating device for mold

Patent metadata

Field	Value
Publication number	US-9849610-B2
Application number	US-201314420571-A
Country	US
Kind code	B2
Filing date	Aug 6, 2013
Priority date	Aug 8, 2012
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

For heating a mold efficiently and uniformly and for protecting an induction coil from corrosive gases, an upper plate that contacts an upper end face of a mold, and a lower plate that contacts a lower end face of the mold are provided, and an induction coil, provided to each plate, has a voltage applied by a commercial power supply. Each plate has a metal plate body in which a recessed housing portion that houses the induction coil is formed, and a cover that closes the recessed housing portion in a state where the induction coil is housed therein. A cover placement portion having a step that is greater than or equal to the thickness of the metal cover is formed in the metal plate body, and a plurality of jacket chambers in which a gas-liquid two phase heating medium is enclosed are formed in the metal plate body.

First claim

The invention claimed is:

1. A mold induction heating device for induction heating a mold that forms a hollow portion therein, comprising:
an upper plate that contacts an upper end face of the mold;
a lower plate that contacts a lower end face of the mold; and
an induction coil that is provided to each plate, and has a voltage applied thereto,
wherein each of the plates has a generally ring-shaped metal plate body in which is formed a recessed housing portion for housing the induction coil, and a metal cover that closes the recessed housing portion in a state where the induction coil is housed therein,
a cover placement portion is formed, and
a plurality of jacket chambers, in which a gas-liquid two phase heating medium is enclosed, are formed in the metal plate body,
wherein in the jacket chambers, a lower surface of a coil adjacent portion that is adjacent to the induction coil has a portion that is lower than a lower surface of portions other than the coil adjacent portion, and
the coil adjacent portions of the jacket chambers adjacent to each other are in communication with each other by a communication passage.

2. The mold induction heating device according to claim 1 ,
wherein the jacket chambers are provided in the metal plate body at an incline such that a liquid heating medium flows to the induction coil side.

3. The mold induction heating device according to claim 1 ,
wherein the metal cover that closes each of the recessed housing portions is divided into a plurality of portions or has a slit portion formed therein.

4. The mold induction heating device according to claim 1 ,
wherein the recessed housing portion formed in the upper plate or the lower plate is generally circular in a plan view,
the induction coil is generally ring-shaped, and
a magnetic iron core that has undergone division or slit machining is provided in a space that is formed in the recessed housing portion by a central portion of the induction coil in a state where the induction coil is housed in the recessed housing portion.

5. The mold induction heating device according to claim 1 ,
wherein the recessed housing portion formed in the upper plate or the lower plate is generally circular in a plan view, and
the induction coil is generally ring-shaped, and is disposed in a portion that is less than or equal to half of a size of the metal plate body in a diameter direction from a position of an innermost ring of the metal plate body in the diameter direction or a vicinity thereof.

6. The mold induction heating device according to claim 1 ,
wherein a short circuit part for conducting electricity and made of a nonmagnetic metal is provided on an inner surface of the recessed housing portions.

7. The mold induction heating device according to claim 1 ,
wherein the jacket chambers of the upper plate and the lower plate are formed radially from a central portion of the metal plate body.

8. The mold induction heating device according to claim 1 ,
wherein the mold is a mold for tire vulcanization.

Assignees

• Bridgestone Corp
• Tokuden Kk

Inventors

• Tonomura Toru
• Fujimoto Yasuhiro
• Yamamura Yoshihiko
• OSAMURA Hideyuki
• Hajikano Akihiko

Classifications

• H05B6/14

  Tools, e.g. nozzles, rollers, calenders · CPC title

• H05B6/108

  for heating a fluid · CPC title

• B29D2030/067

  the vulcanizing fluids being gases or vapours · CPC title

• H05B6/36

  Coil arrangements · CPC title

• B29C33/06 Primary

  using radiation {, e.g. electro-magnetic waves, induction heating} · CPC title