U.S. patent application number 13/534857 was filed with the patent office on 2013-05-09 for mold for hot stamping.
This patent application is currently assigned to KIA MOTORS CORPORATION. The applicant listed for this patent is Seung Sang Lee. Invention is credited to Seung Sang Lee.
Application Number | 20130111965 13/534857 |
Document ID | / |
Family ID | 48129084 |
Filed Date | 2013-05-09 |
United States Patent
Application |
20130111965 |
Kind Code |
A1 |
Lee; Seung Sang |
May 9, 2013 |
MOLD FOR HOT STAMPING
Abstract
A mold for hot stamping is disclosed. The mold may include: a
base plate configured to receive and exhaust coolant; at least one
appearance block mounted at a surface of the base plate and
positioned along a shape of a product, the appearance block having
a mounting space therein; and an insert block inserted in the
mounting space so as to be fixed to the appearance block and
mounted at a surface of the base plate. The insert block is
provided with a plurality of passages in an exterior surface
thereof for circulating coolant, wherein the plurality of passages
are in fluidly communication with the base plate.
Inventors: |
Lee; Seung Sang; (Busan,
KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Lee; Seung Sang |
Busan |
|
KR |
|
|
Assignee: |
KIA MOTORS CORPORATION
Seoul
KR
HYUNDAI MOTOR COMPANY
Seoul
KR
|
Family ID: |
48129084 |
Appl. No.: |
13/534857 |
Filed: |
June 27, 2012 |
Current U.S.
Class: |
72/342.4 |
Current CPC
Class: |
B21D 37/16 20130101;
C21D 9/0068 20130101 |
Class at
Publication: |
72/342.4 |
International
Class: |
B21D 37/16 20060101
B21D037/16 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 7, 2011 |
KR |
10-2011-0115152 |
Claims
1. A mold for hot stamping, comprising: a base plate configured to
receive and exhaust coolant; at least one appearance block mounted
at a top outer surface of the base plate, the at least one
appearance block positioned along a shape of a product and having a
mounting space disposed therein; and an insert block inserted in
the mounting space, the insert block being fixed to the appearance
block, and being mounted at the outer surface of the base plate,
wherein the insert block is provided with a plurality of passages
at an exterior circumference thereof, the passages being configured
for circulating the coolant, and wherein the plurality of passages
are in fluid communication with the base plate.
2. The mold of claim 1, wherein the appearance block has a shape
substantially the same as the shape of the product, and the
mounting space has a shape similar to the shape of the appearance
block.
3. The mold of claim 2, wherein the insert block comprises: a body
portion having a shape that is the same as the shape of the
mounting space, the body portion being inserted in the mounting
space and being fixed to the appearance block; a pair of storing
recesses disposed in opposing sides of a lower portion of the body
portion, the recesses each along a length direction of the body
portion; and a plurality of coolant flowing grooves, each coolant
flowing groove extending between the pair of storing recesses, and
being formed in an exterior surface of the body portion along a
width direction thereof.
4. The mold of claim 3, wherein outer edges of the body portion are
rounded.
5. The mold of claim 3, wherein the plurality of coolant flowing
grooves are disposed spaced apart from each other along the length
direction of the body portion.
6. The mold of claim 3, wherein the body portion has a coolant
inflow hole and a coolant exhaust hole formed therein, the coolant
inflow hole and a coolant exhaust hole being in fluidly
communication with the base plate.
7. The mold of claim 6, wherein each of the pair of storing
recesses are connected to the coolant inflow hole and the coolant
exhaust hole respectively.
8. The mold of claim 1, wherein the base plate has a pair of first
coolant chambers for storing coolant, the pair of first coolant
chambers disposed at a bottom surface of the base plate along a
length direction thereof.
9. The mold of claim 8, wherein the base plate further has a pair
of second coolant chambers disposed at the bottom surface of the
base plate, and each of the second coolant chambers are in fluid
communication with a corresponding first coolant chamber.
10. The mold of claim 8, wherein the base plate further has a seal
cover mounted at the bottom surface, the seal cover corresponding
to each of the first coolant chambers.
11. The mold of claim 1, wherein the insert block is inserted in
the mounting space of the appearance block and is fixed to the
appearance block by welding.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority to and the benefit of
Korean Patent Application No. 10-2011-0115152 filed in the Korean
Intellectual Property Office on Nov. 7, 2011, the entire contents
of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] (a) Field of the Invention
[0003] The present invention relates to a mold for hot stamping.
More particularly, the present invention relates to a mold through
which a coolant can be smoothly flowed to improve cooling speed and
cooling performance, such that a super high strength product is
manufactured at a high temperature.
[0004] (b) Background Art
[0005] Generally, molds are divided into three types: an injection
mold for manufacturing plastic products, a press mold for
manufacturing products by using steel plates, and a die casting
mold for manufacturing products by melting metals and injecting the
molten metal into the die casting mold. Typically, such molds
include a movable mold and a fixed mold which make the
manufacturing process run more smoothly.
[0006] Recently there has been an increase in the use of molds for
manufacturing products used in vehicles (i.e. various vehicle
components). Accordingly, there is a need to properly design these
molds in order to produce high quality products which posses
desired properties and specifications.
[0007] Improving collision performance and securing safety are two
main concerns of vehicle industries. In order to provide a
lightweight vehicle with a strong vehicle body, motor companies
typically use materials such as TRIP steel, DP steel, aluminum
alloy steel, and magnesium alloy steel to produce various vehicle
parts, or investigate new technologies such as tailed welding blank
(TWB), hydroforming and hot stamping.
[0008] As used herein, a hot stamping process is a process for
forming a structure (such as a vehicle panel) at a high temperature
so as to reduce the weight thereof while maintaining the strength,
and is particularly used with reference to manufacturing a vehicle
body. In general, after a material is heated to the high
temperature, the material is pressed in a mold and the mold itself
is cooled so as to manufacture high strength products.
[0009] The hot stamping process includes heating a blank to a
temperature higher than the Ac3 transformation point (i.e. the
temperature at which transformation of ferrite into austenite is
completed) so as to austenitize the blank completely, and forming
and quickly cooling the blank in the mold so as to transform the
blank into high strength martensite.
[0010] The components of the vehicle body manufactured by the hot
stamping have high tensile strength, particularly tensile strengths
higher than or equal to 1500 MPa. Therefore, collision performance
of the vehicle may be improved and high safety of occupants may be
provided.
[0011] In a conventional hot stamping process and device, coolant
is supplied into the mold through coolant holes directly formed in
the mold. However, it is very difficult to form the coolant holes
in the mold, particularly when manufacturing products of complex
shapes, and much time is necessary for forming the coolant
holes.
[0012] Further, if a large number of coolant holes are formed in
the mold so as to cool the mold more quickly, strength of the mold
may be deteriorated using the conventional hot stamping process and
device. This decrease in strength can result in cracks or damage to
the mold, particularly due to contraction or deformation of the
mold during quick temperature changes. As a result, the coolant
flowing through the mold may leak.
[0013] Since design, manufacture, and verification of coolant flow
lines in the mold is achieved based on an actual model, initial
investment and time for developing the products may increase.
Therefore, it is preferable to develop the optimal cooling method
for the mold at a design step of new products.
[0014] The above information disclosed in this Background section
is only for enhancement of understanding of the background of the
invention and therefore it may contain information that does not
form the prior art that is already known in this country to a
person of ordinary skill in the art.
SUMMARY OF THE INVENTION
[0015] The present invention has been made in an effort to provide
a mold for hot stamping that is capable of quickly cooling a
structure, particularly a panel, when manufacturing the structure
by a hot stamping process.
[0016] In addition, the present invention has been made in an
effort to provide a mold for hot stamping that has improved
durability, particularly by preventing, in advance, the potential
for the occurrence of deformations and cracks in the mold which can
result from temperature fluctuations (e.g. when cooling a product).
The present invention has further been made in an effort to provide
a mold and method that produces a flawless product and improves
productivity by achieving uniform cooling.
[0017] According to one aspect, the present invention provides a
mold for hot stamping that may include: a base plate configured to
receive and exhaust coolant; at least one appearance block mounted
at a surface of the base plate in a shape of a product to be
formed, and having a mounting space formed therein; and an insert
block disposed in the mounting space so as to be fixed to the
appearance block and mounted at a surface of the base plate.
According to various embodiments, the insert block is provided with
a plurality of passages for circulating coolant. The plurality of
passages can be formed at an exterior circumference thereof close
to the appearance block where the insert block is fixed to the
appearance block. The plurality of passages can be in fluid
communication with the base plate.
[0018] According to various embodiments, the shape of the
appearance block may be substantially the same as that of the
product. Further, and the mounting space may have a shape similar
to the shape of the appearance block.
[0019] According to various embodiments, the insert block may
include: a body portion having a shape that is the similar to or
the same as the shape of the mounting space, and it may be fixed to
the appearance block when it is disposed in the mounting space; a
pair of storing recesses (although it is understood that any number
of storing recesses could also be provided at various desired
locations) formed respectively at opposite sides of a lower portion
of the body portion along a length direction of the body portion,
and configured so as to store the coolant therein; and a plurality
of coolant flowing grooves adapted to provide a connection between
the pair of storing recesses, formed at an exterior circumference
of the body portion along a width direction thereof, and defining
the plurality of passages.
[0020] According to various embodiments, edges of the body portion
may be formed to be rounded.
[0021] According to various embodiments, the plurality of coolant
flowing grooves may be disposed spaced apart from each other along
the length direction of the body portion.
[0022] According to various embodiments, the body portion may have
a coolant inflow hole and a coolant exhaust hole formed therein and
fluidly connected to the base plate.
[0023] According to various embodiments, a pair of storing recesses
may be connected to the coolant inflow hole and the coolant exhaust
hole respectively.
[0024] According to various embodiments, the base plate may have a
pair of first coolant chambers formed at both sides of the other
surface (the appearance block(s) mounted at one surface of the base
plate, and the coolant chambers formed at a different "other
surface", e.g. see FIG. 5) along a length direction thereof, and
the coolant may be stored in each of the first coolant chamber.
[0025] According to various embodiments, the base plate may further
have a pair of second coolant chambers formed at both side portions
of the surface (i.e. a common surface as the appearance block)
thereof, and each of the second coolant chambers may store coolant
therein and may be fluidly connected to a corresponding first
coolant chamber.
[0026] According to various embodiments, the base plate may further
have a seal cover mounted at the other surface (i.e. the same
surface as the first and second coolant chambers) corresponding to
each of the first coolant chambers.
[0027] According to various embodiments, the insert block may be
fixed to the appearance block by welding when it is inserted in the
mounting space of the appearance block.
[0028] It is understood that the term "vehicle" or "vehicular" or
other similar term as used herein is inclusive of motor vehicles in
general such as passenger automobiles including sports utility
vehicles (SUV), buses, trucks, various commercial vehicles,
watercraft including a variety of boats and ships, aircraft, and
the like, and includes hybrid vehicles, electric vehicles, plug-in
hybrid electric vehicles, hydrogen-powered vehicles and other
alternative fuel vehicles (e.g. fuels derived from resources other
than petroleum). As referred to herein, a hybrid vehicle is a
vehicle that has two or more sources of power, for example both
gasoline-powered and electric-powered vehicles.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029] FIG. 1 is a perspective view of a mold for hot stamping
according to an exemplary embodiment of the present invention.
[0030] FIG. 2 is an enlarged perspective view of "A" portion in
FIG. 1.
[0031] FIG. 3 is an exploded perspective view of a mold for hot
stamping according to an exemplary embodiment of the present
invention.
[0032] FIG. 4 is a perspective view showing flow direction of
coolant supplied to a mold for hot stamping according to an
exemplary embodiment of the present invention.
[0033] FIG. 5 is a cross-sectional view taken along the line B-B in
FIG. 4.
TABLE-US-00001 <Description of symbols> 10: base plate 11:
nipple 13: first coolant chamber 15: second coolant chamber 20:
appearance block 21: mounting space 30: insert block 31: body
portion 33: storing recess 35: coolant flowing groove 37: coolant
inflow hole 39: coolant exhaust hole
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0034] An exemplary embodiment of the present invention will
hereinafter be described in detail with reference to the
accompanying drawings.
[0035] Exemplary embodiments described in this specification and
drawings are just exemplary embodiments of the present invention.
It is to be understood that there can be various modifications and
equivalents included in the spirit of the present invention at the
filing of this application.
[0036] FIG. 1 is a perspective view of a mold for hot stamping
according to an exemplary embodiment of the present invention; FIG.
2 is an enlarged perspective view of "A" portion in FIG. 1; FIG. 3
is an exploded perspective view of a mold for hot stamping
according to an exemplary embodiment of the present invention; FIG.
4 is a perspective view showing flow direction of coolant supplied
to a mold for hot stamping according to an exemplary embodiment of
the present invention; and FIG. 5 is a cross-sectional view taken
along the line B-B in FIG. 4.
[0037] Referring to drawings, a mold 1 for hot stamping according
to an exemplary embodiment of the present invention is adapted to
quickly cool a product, such as a panel, when manufacturing the
product by the hot stamping. In particular, the mold is designed
such that hydraulic lines for flowing coolant are formed in the
mold. As such, the coolant may flow smoothly and cooling
performance may be improved.
[0038] In addition, deformation and cracks occurring in the mold
when the mold is cooled is prevented in advance. In particular,
because the present invention does not directly form coolant flow
lines in the mold but, rather, forms these coolant flow lines in
the exterior surface of an insert block which is subsequently
disposed in the appearance block, the durability of the mold may be
improved and such deformation and cracking can be prevented. In
addition, according to the present invention, product defects may
be reduced or even eliminated and productivity may be improved by
achieving uniform cooling of the mold.
[0039] For this purpose, the mold 1 for hot stamping according to
an exemplary embodiment of the present invention, as shown in FIG.
1 to FIG. 3, includes a base plate 10. The base plate 10 includes
at least one appearance block 20 and an insert block 30.
[0040] A nipple 11 is mounted at a side of the base plate 10. The
nipple 11 is adapted to supply the coolant to the base plate 10
and/or exhaust the coolant from the base plate 10.
[0041] Coolant lines (not shown) connected to the nipple 11 are
formed in the base plate 10. Therefore, the coolant flowing into
the base plate 10 through the nipple 11 circulates along the
coolant lines, and thereafter t is exhausted through the nipple
11.
[0042] In this exemplary embodiment, a plurality of appearance
blocks 20 is provided. As shown in FIG. 1, five appearance blocks
20 are provided. However, it is understood that any number of
appearance blocks 20 can be provided. The plurality of appearance
blocks 20 together (or alternatively a single appearance block)
form the same shape as that of the product so as to form the shape
of the product during hot stamping. Each appearance block 20 is
mounted at a surface of the base plate 10 and has a mounting space
21 formed therein. In other words, the each appearance block 20 is
hollow, thus providing a mounting space 21 therein.
[0043] The appearance blocks 20 are mounted along the base plate
10, such as along the length as shown in FIG. 1, according to the
shape of the product.
[0044] Herein, the shape of the appearance block 20 is the same as
that of the product, and a shape of the mounting space 21 is
similar to that of the appearance block 20. Because the mounting
space 21 is within the appearance block, the size of the mounting
space 21 is slightly smaller than that of the appearance block 20.
As such, the coolant can flow along the shape of the product (e.g.
panel) close to the product. According to various embodiments the
product forms at a location outside of the appearance block.
Therefore, cooling performance may be improved.
[0045] According to various embodiments, the insert block 30 is
adapted to supply the coolant in the mounting space 21 of the
appearance block 20. As shown, the insert block 30 is disposed in
the mounting space 21 and is coupled to the appearance block
20.
[0046] As shown in FIG. 5, the insert block 30 is mounted between
the base plate 10 and the appearance block 20.
[0047] The insert block 30 can be fixedly mounted to the appearance
block 20 through any suitable means, such as welding, when the
insert block is inserted in the mounting space 21 of the appearance
block 20.
[0048] The insert block 30, as shown in FIG. 3 to FIG. 5, includes
a body portion 31, a storing recess 33, and a coolant flowing
groove 35.
[0049] As shown in FIGS. 2, 3 and 5, the shape of the body portion
31 is the same as that of the mounting space 21. Therefore, the
body portion 31 can be fixedly mounted at the appearance block 20
through welding or other suitable means when it is inserted in the
mounting space 21.
[0050] in particular, the body portion 31 can be inserted in the
mounting space 21 such that an exterior circumference of the body
portion 31 is disposed within the mounting space 21, and contacts
an interior surface of the appearance block 20.
[0051] As shown in the figures, according to preferred embodiments
outer edges of the body portion 31 are rounded to prevent damage
and breakage that can occur when the body portion 31 is inserted in
the mounting space 21 and the edge portions of the body portion 31
contact the interior surface of the appearance block 20. The
rounded edge portions, further, allow for more smooth insertion of
the body portion 31 in the mounting space 21.
[0052] As shown in FIG. 5, a pair of storing recesses 33 are formed
respectively at a opposite sides of a lower portion of the body
portion 31 close to the base plate 10. These storing recesses 33
may, as shown in FIG. 2, run along the length direction of the body
portion 31. The coolant supplied from the base plate 10 is adapted
to be stored in the storing recess 33. In particular, the storing
recess 33 may be adapted, as shown, to store the coolant supplied
to or exhausted from the base plate 10 between the interior of the
appearance block and the exterior of the body portion 31.
[0053] As shown in FIG. 5, the pair of storing recesses 33 are
connected to a coolant inflow hole 37 and a coolant exhaust hole 39
formed in the body portion 31, respectively.
[0054] In other words, the one of the storing recesses 33 is
connected to the coolant inflow hole 37 so as to store the coolant
received through the coolant inflow hole 37, while the other of the
storing recesses 33 is connected to the coolant exhaust hole 39 so
as to store the coolant that has circulated through the coolant
flowing groove 35.
[0055] Meanwhile, first coolant chambers 13 for storing the coolant
can be further formed respectively at both sides of the other
surface of the base plate 10 (i.e. wherein a "top surface" is a
surface on which the appearance block 20 is provided, and the
"other surface" is a lower "interior" surface as shown in FIG. 5 on
which the coolant chambers 13 are mounted). The coolant chambers 13
may run along the length direction of the base plate 10, as shown
in FIG. 5. Second coolant chambers 15 can further be provided in
connection with the first coolant chambers 13 for storing coolant.
The second coolant chambers 15 can be formed at a surface of the
base plate 10, such as an upper interior surfaced as shown in FIG.
5. As shown in FIG. 5, the second coolant chambers 15 can be
disposed at two locations along the length of the base plate 10,
such that they are aligned with the coolant inflow hole 37 and
coolant exhaust hole 39. Each of the second coolant chambers 15 is
further in connection with each of the storing recesses 33.
[0056] As shown in FIG. 5, the first coolant chambers 13 and the
second coolant chambers 15 are formed at positions where the
coolant flows or is exhausted, and are configured so as to store
the inflow or exhaust coolant.
[0057] As further shown in FIG. 5, seal covers 17 corresponding to
the first coolant chambers 13 can further be mounted at the other
surface of the base plate 10. The seal covers 17 are adapted to
prevent leakage of the coolant stored in the first coolant chamber
13 to the exterior of the base plate 10.
[0058] According to the described embodiment, the coolant flowing
into the nipple 11 is primarily stored in the one of the pair of
the first coolant chambers 13, and the coolant stored in the first
coolant chamber 13 is secondarily stored in the corresponding
second coolant chamber 15 which is in connection with the first
coolant chamber 13. After the coolant has flowed through the
coolant line, it passes through the coolant exhaust hole 39. Before
it is exhausted through the nipple 11, it is primarily stored in
the other of the first coolant chambers 13, and is secondarily
stored in the second corresponding coolant chamber 15 which is in
connection with the other of the first coolant chambers 13. The
coolant stored in the second coolant chamber 15 connected to the
other of the first coolant chamber 13 is subsequently exhausted
from the base plate 10 through the nipple 11.
[0059] As shown, one of the pair of the second coolant chambers 15
is in connection with the coolant inflow hole 37 of the body
portion 31 so as to supply the coolant to the storing recess 33
connected to the coolant inflow hole 37. The other of the pair of
the second coolant chambers 15 is in connection with the coolant
exhaust hole 39 of the body portion 31 so as to store the coolant
exhausted from the storing recess 33 connected to the coolant
exhaust hole 39.
[0060] In an exemplary embodiment of the present invention, at
least one coolant flowing groove 35 is formed in the body portion
and connects the pair of storing recesses 33 disposed on opposing
sides of the body portion.
[0061] As shown in the FIG. 3 embodiment, each coolant flowing
groove 35 is extends along a width direction of the body portion
31, and in particular, extends along an outer surface of the body
portion 31 along the width thereof. In addition, a plurality of
coolant flowing grooves 35 can be disposed spaced apart from each
other in the length direction of body portion 31. In one or more
exemplary embodiments, the plurality of coolant flowing grooves 35
are disposed spaced apart from each other at an even distance. As
further shown in FIG. 3, according to a variety of embodiments, the
plurality of coolant flowing grooves 35 run parallel to each other
along the width of the body portion 31.
[0062] The coolant flowing grooves 35 form hydraulic lines through
which the coolant can flows between the interior surface of the
appearance block 20 and the body portion 31 (i.e. within the
mounting space 21). In other words, the coolant flowing grooves 35
may be defined as a space between the appearance block 20 inner
surface and the outer "recessed" surface of the body portion 31,
wherein the outer surface of the body portion 31 at the position of
the coolant flowing grooves 35 is recessed as shown in FIG. 3).
Therefore, the coolant flows smoothly along the width direction of
the body portion 31 through the coolant flowing grooves 35 formed
between the exterior recessed surface of the body portion 31 and
the interior surface of the appearance block 20.
[0063] According to embodiments of the present invention, since the
coolant supplied through or exhausted through the nipple 11 of the
base plate 10 can be stored in the first and second coolant
chambers 13 and 15 and the storing recesses 33, the coolant can
flow through the coolant flowing grooves 35 continuously.
[0064] It is noted that while the coolant flowing grooves 35 are
depicted in the figures and described herein as being formed along
the exterior circumference of the body portion 31 spaced apart with
an even distance therebetween, the present invention is not limited
to this configuration and spacing. For example, as one of skill in
the art would appreciate, the number of and distances between the
coolant flowing grooves 35 can be changed taking into account of
the shape and the size of the product and desired flow of the
coolant.
[0065] An assembly process and function of the mold for hot
stamping according to an exemplary embodiment of the present
invention will now be described in detail with reference to FIG. 4
and FIG. 5.
[0066] The exterior circumference of the appearance block 20 is
formed so as to have a shape that is the same as that of the
product (e.g. panel), and the mounting space 21 is formed at the
interior circumference of the appearance block 20. In particular,
the appearance block 20 is formed hollow such that the interior
surface of the appearance block 20 corresponds to the outer shape
of the appearance block 20. In addition, the insert block 30 is
formed to have a shape also corresponding to that of the appearance
block 20, with storing recesses 33 and a plurality of coolant
flowing grooves 35 formed at the exterior circumference of the body
portion 31. The insert block 30 thus formed is inserted in the
mounting space 21 of the appearance block 20 and is fixed to
appearance block 20 through suitable fixation means, such as
welding.
[0067] According to the exemplary embodiment, the insert block 30
is mounted on the appearance block 20 such that the exterior
circumference of the body portion 31 is in disposed within the
mounting space 21, particularly wherein the exterior surface of the
body portion 31 is in contact with the interior surface of the
appearance block 20.
[0068] After assembling of the appearance block 20 and the insert
block 30, the coolant inflow hole 37 and the coolant exhaust hole
39 of the insert block 30 are provided at positions corresponding
to the pair of the second coolant chambers 15 formed in the base
plate 10, and the plurality of appearance blocks 20 are mounted to
the base plate 10 so as to complete assembling of the mold 1.
[0069] As shown in FIG. 4, if the coolant is supplied to the base
plate 10 through the nipple 11, the coolant flows along the length
direction of the base plate 10 and flows into each appearance block
20.
[0070] In this case, as shown in FIG. 5, the coolant is primarily
stored in the one of the first coolant chambers 13 and is supplied
to the second coolant chamber 15 connected thereto.
[0071] The coolant stored in the second coolant chamber 15 is then
supplied to the coolant inflow hole 37 of the insert block 30, and
is stored in the one of the storing recesses 33.
[0072] The coolant stored in the one of the storing recesses 33
flows along the interior circumference of the mounting space 21
through the coolant flowing grooves 35 formed in the body portion
31 of the insert block 30.
[0073] After the coolant flows through the coolant flowing grooves
35, it passes to the other of the storing recesses 33 where it is
stored and is then exhausted to the second coolant chamber 15
connected to the coolant exhaust hole 39. After that, the coolant
is stored in the other of the first coolant chambers 13, and is
subsequently exhausted to the exterior of the base plate 10 through
the nipple 11.
[0074] According to an exemplary embodiment of the present
invention, coolant flow lines for flowing the coolant are not
directly formed at the mold 1 but, rather, are formed in the
exterior surface of the insert block 30 which is then disposed and
assembled in the appearance block 20. Therefore, degree of freedom
in mold design may be improved and cooling performance of the mold,
which is a major factor of hot stamping, may be enhanced.
[0075] In addition, deformation and cracking of the mold when the
mold is cooled is prevented in advance. Therefore, durability may
be improved. In addition, a product may be manufactured without
defects, and productivity may be improved by achieving uniform
cooling of the panel.
[0076] While this invention has been described in connection with
what is presently considered to be practical exemplary embodiments,
it is to be understood that the invention is not limited to the
disclosed embodiments, but, on the contrary, is intended to cover
various modifications and equivalent arrangements included within
the spirit and scope of the appended claims.
* * * * *