Mold device for hot stamping

Patent metadata

Field	Value
Publication number	US-10022767-B2
Application number	US-201514825658-A
Country	US
Kind code	B2
Filing date	Aug 13, 2015
Priority date	Apr 29, 2015
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

The present invention relates to a mold device for hot stamping, and includes: a hot stamping mold that molds an ultra-high strength steel plate and has a softening part; and a block heater part that is inserted into a lower portion of the softening part of the hot stamping mold to soften the ultra-high strength steel plate, in order to maintain a uniform temperature distribution of the softening part of the hot stamping mold and improve the temperature management and the maintenance performance of the softening part by providing a segmented structure for inserting the block heater part into the softening part of the hot stamping mold.

First claim

What is claimed is:

1. A mold device for hot stamping, comprising:
a hot stamping mold configured to mold a steel plate, the hot stamping mold having a softening part provided at a portion thereof; and
a block heater part configured to be connected to a lower portion of the softening part of the hot stamping mold to soften the steel plate,
wherein the block heater part includes at least a block mold segmented into five block molds; and a plurality of block heaters configured to be inserted into the block molds to uniformly heat the block molds and the softening part of the hot stamping mold.

2. The mold device for hot stamping according to claim 1 , wherein the block heater part includes:
a plurality of block molds configured to be vertically assembled to the softening part of the hot stamping mold.

3. The mold device for hot stamping according to claim 2 , further comprising a plate arranged at a lower portion of the block molds so as to fix the plurality of block heaters.

4. The mold device for hot stamping according to claim 3 , wherein a lower portion of the plate is provided with an insulating base to minimize heat loss between the block molds and the softening part of the hot stamping mold.

5. The mold device for hot stamping according to claim 2 , wherein the plurality of block molds is five block molds that correspond to a shape of the softening part of the hot stamping mold so as to minimize a deformation due to thermal expansion.

6. The mold device for hot stamping according to claim 2 , wherein the block heaters are formed in a protrusion shape having a predetermined height, and an outer circumferential surface of each of the block heaters is provided with a coil to generate heat.

7. The mold device for hot stamping according to claim 6 , wherein the coil of each of the block heaters is supplied with power from outside to generate heat.

8. The mold device for hot stamping according to claim 1 , wherein a heating temperature of the block heater part applied to the softening part of the hot stamping mold is set to be about 420° C.

9. The mold device for hot stamping according to claim 8 , wherein a high strength part except the softening part of the hot stamping mold is provided with a cooling water passage of which a temperature is set to be about 20° C.

10. A mold device for hot stamping, comprising:
a hot stamping mold configured to mold a steel plate, provided with a high strength part, and including a softening part provided at a portion thereof; and
a block heater part configured to include a plurality of block molds vertically assembled to the softening part of the hot stamping mold, and a plurality of block heaters inserted into the block molds to uniformly heat the block molds and the softening part of the hot stamping mold and provided with a coil, a plate, which fixes the block heaters, provided at a lower portion of the block molds, and an insulating base to minimize heat loss between the block molds and the softening part of the hot stamping mold to soften the steel plate,
wherein the block heater part includes at least a block mold segmented into five block molds; and a plurality of block heaters configured to be inserted into the block molds to uniformly heat the block molds and the softening part of the hot stamping mold.

Assignees

• Kia Motors Corp

Inventors

• Kang Jae Bum
• Kim Tae Wan

Classifications

• B21D37/16

  Heating or cooling · CPC title

• B21D22/022 Primary

  by heating the blank or stamping associated with heat treatment (C21D takes precedence) · CPC title

• B21D37/04

  Movable or exchangeable mountings for tools · CPC title