U.S. patent application number 13/174535 was filed with the patent office on 2012-06-07 for press system.
This patent application is currently assigned to HYUNDAI MOTOR COMPANY. Invention is credited to Joo Suk Park.
Application Number | 20120137749 13/174535 |
Document ID | / |
Family ID | 46160939 |
Filed Date | 2012-06-07 |
United States Patent
Application |
20120137749 |
Kind Code |
A1 |
Park; Joo Suk |
June 7, 2012 |
PRESS SYSTEM
Abstract
Disclosed is a press system having advantages of preventing a
molded product panel from bursting or being torn due to a
difference in molding depth caused by a protrusion shape to improve
the moldability and marketability of the product panel when press
molding is performed on a material panel. An illustrative press
system comprises: a lower die punch provided on a bolster and
having a lower surface shape of a product panel; a blank holder
provided on the outside of the lower die punch and mounted on the
bolster through cushion pins; an upper die having an upper surface
shape of the product panel, mounted on the slider, and pressing a
material panel together with the lower die punch to mold the
product panel; and a sub blank holder unit provided inside the
lower die punch by performing the molding while holding a portion
of the material panel to be molded into a protrusion shape together
with the upper die such that a difference in molding depth is
compensated when molding is performed.
Inventors: |
Park; Joo Suk; (Ulsan,
KR) |
Assignee: |
HYUNDAI MOTOR COMPANY
Seoul
KR
|
Family ID: |
46160939 |
Appl. No.: |
13/174535 |
Filed: |
June 30, 2011 |
Current U.S.
Class: |
72/379.2 ;
72/414; 72/460 |
Current CPC
Class: |
B21D 22/06 20130101;
B21D 24/04 20130101 |
Class at
Publication: |
72/379.2 ;
72/414; 72/460 |
International
Class: |
B21D 22/06 20060101
B21D022/06; B21D 37/10 20060101 B21D037/10 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 6, 2010 |
KR |
10-2010-0123462 |
Claims
1. A press system comprising: a lower die punch provided on a
bolster and having a lower surface shape of a product panel; a
blank holder provided on the outside of the lower die punch and
mounted on the bolster through cushion pins; an upper die having an
upper surface shape of the product panel, mounted on a slider, and
configured to press a material panel together with the lower die
punch to mold the product panel, a portion of the material panel to
be molded into a protrusion shape; and a sub blank holder unit
provided inside the lower die punch and configured to hold the
portion of the material panel to be molded into the protrusion
shape together with the upper die such that a difference in molding
depth is compensated.
2. The press system of claim 1, wherein the sub blank holder unit
includes a mount plate mounted on one side of an upper portion of
the bolster, a sub blank holder provided inside the lower die punch
to be slidable and holding a portion of the material panel, and at
least one elastic member provided between the mount plate and the
sub blank holder and providing elastic force to the sub blank
holder.
3. The press system of claim 2, wherein the elastic member is made
of a gas-cylinder-type spring.
4. The press system of claim 2, wherein the elastic member is
provided in plural, and the plurality of elastic members are
mounted at equal intervals between the mount plate and the sub
blank holder.
5. A method, comprising: inserting a material panel on a blank
holder between a lower die punch and an upper die, the lower die
punch having a lower surface shape of a product panel, the blank
holder provided on the outside of the lower die punch, and the
upper die having an upper surface shape of the product panel;
pressing the material panel between the upper die and lower die
punch to mold the product panel, a portion of the material panel to
be molded into a protrusion shape; and compensating a difference in
molding depth between the upper die and lower die punch at the
protrusion shape using a sub blank holder unit provided inside the
lower die punch and configured to hold the portion of the material
panel to be molded into the protrusion shape together with the
upper die.
6. The method of claim 5, wherein the sub blank holder unit
includes a mount plate mounted on one side of an upper portion of
the bolster, a sub blank holder provided inside the lower die punch
to be slidable and holding a portion of the material panel, and at
least one elastic member provided between the mount plate and the
sub blank holder and providing elastic force to the sub blank
holder.
7. The method of claim 6, wherein the elastic member is made of a
gas-cylinder-type spring.
8. The method of claim 6, wherein the elastic member is provided in
plural, and the plurality of elastic members are mounted at equal
intervals between the mount plate and the sub blank holder.
9. A press system comprising: a lower die punch having a lower
surface shape of a product panel; a blank holder provided on the
outside of the lower die punch; an upper die having an upper
surface shape of the product panel and configured to press a
material panel together with the lower die punch to mold the
product panel, a portion of the material panel to be molded into a
protrusion shape; and a sub blank holder unit provided inside the
lower die punch and configured to hold the portion of the material
panel to be molded into the protrusion shape together with the
upper die such that a difference in molding depth is
compensated.
10. The press system of claim 9, wherein the lower die punch is
provided on a bolster, the blank holder is mounted on the bolster,
and the upper die is mounted on a slider.
11. The press system of claim 10, wherein the sub blank holder unit
includes a mount plate mounted on one side of an upper portion of
the bolster, a sub blank holder provided inside the lower die punch
to be slidable and holding a portion of the material panel, and at
least one elastic member provided between the mount plate and the
sub blank holder and providing elastic force to the sub blank
holder.
12. The press system of claim 11, wherein the elastic member is
made of a gas-cylinder-type spring.
13. The press system of claim 11, wherein the elastic member is
provided in plural, and the plurality of elastic members are
mounted at equal intervals between the mount plate and the sub
blank holder.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority to and the benefit of
Korean Patent Application No. 10-2010-0123462 filed in the Korean
Intellectual Property Office on Dec. 6, 2010, 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 press system, and more
particularly, to a press system preventing a molded product panel
from bursting or being torn due to a difference in molding depth
caused by a protrusion shape when a material panel is molded.
[0004] (b) Description of the Related Art
[0005] In general, a vehicle maker produces a vehicle by assembling
about 20000 to 30000 components through several assembly
processes.
[0006] Particularly, product panels are produced through various
kinds of press systems in the first stage of a vehicle
manufacturing process, and is transferred to a vehicle body factory
where each portion of the product panels is assembled to form a
vehicle body in body in white (B.I.W).
[0007] As described above, in order to mold a material panel into a
product panel, averagely, four press molding processes are
performed, including a draw molding process, a trimming and
piercing molding process, a cutting and piercing process, and a
flanging and piercing process. The draw molding process is a major
process which plastically processes a material according to product
data and determines 90% or more of the quality of a panel
component.
[0008] In a general press system applied to the draw molding
process, as shown in FIG. 1, a lower die punch 101 having a lower
end surface shape of a product panel is mounted on a lower bolster
103. On the outside of the lower die punch 101, a blank holder 107
is mounted on the bolster 103 through cushion pins 105.
[0009] Further, an upper die 111 having an upper end surface shape
of the product panel is mounted on an upper slider 109 over the
lower die punch 101, and a material panel 113 lies on the blank
holder 107 between the upper die 111 and the lower die punch 101
and is pressed to form a product panel.
[0010] That is, as shown in S1 of FIG. 1, first, the panel 113 is
inserted between the upper die 111 and the lower die punch 101 and
the panel 113 is put on the blank holder 107.
[0011] In this case, the upper die 111 descends such that the edge
of the panel 113 is held by a dieface surface of the upper die 111
and a dieface surface of the blank holder 107 as shown in S2 of
FIG. 1, and the upper die 111 and the blank holder 107 descend
together as shown in S3 of FIG. 3 so as to plastically process the
panel 113 into a product panel by press molding, as shown S4 of
FIG. 1.
[0012] However, the general press system has a problem in which the
product panel bursts or is torn at a portion molded in a protrusion
shape due to a difference in molding depth in a case of molding a
material panel integrally with a protrusion shape such as a spoiler
applied to a tail gate of a hatchback style vehicle or an RV
vehicle.
[0013] Therefore, the general press system involves problems in
which when a material panel is molded, the depth of the protrusion
shape is restricted to reduce moldability, a separate additional
structure should be mounted to implement the protrusion shape to
increase the cost, and the marketability of the molded product
panel is reduced.
[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 press system having advantages of preventing a molded product
panel from bursting or being torn due to a difference in molding
depth caused by a protrusion shape to improve the moldability and
marketability of the product panel when press molding is performed
on a material panel.
[0016] An exemplary embodiment of the present invention provides a
press system including: a lower die punch provided on a bolster and
having a lower surface shape of a product panel; a blank holder
provided on the outside of the lower die punch and mounted on the
bolster through cushion pins; an upper die having an upper surface
shape of the product panel, mounted on the slider, and pressing a
material panel together with the lower die punch to mold the
product panel; and a sub blank holder unit provided inside the
lower die punch by performing the molding while holding a portion
of the material panel to be molded into a protrusion shape together
with the upper die such that a difference in molding depth is
compensated.
[0017] The sub blank holder unit may include a mount plate mounted
on one side of an upper portion of the bolster, a sub blank holder
provided inside the lower die punch to be sildable and holding a
portion of the material panel, and at least one elastic member
provided between the mount plate and the sub blank holder and
providing elastic force to the sub blank holder.
[0018] The elastic member may be made of a gas-cylinder-type
spring.
[0019] The elastic member may be provided in plural, and the
plurality of elastic members may be mounted at equal intervals
between the mount plate and the sub blank holder.
[0020] According to the exemplary embodiments of the present
invention, it is possible to prevent a product panel from bursting
or being torn due to a difference in molding depth caused by a
protrusion shape when press molding is performed on a material
panel.
BRIEF DESCRIPTION OF THE DRAWINGS
[0021] FIG. 1 is a view illustrating operation states of a general
press system in stages.
[0022] FIG. 2 is a cross-sectional view of a press system according
to an exemplary embodiment of the present invention.
[0023] FIG. 3 is a view illustrating operation states of the press
system according to the exemplary embodiment of the present
invention in stages.
DESCRIPTION OF SYMBOLS
[0024] 1 . . . Lower die punch;
[0025] 3 . . . Bolster;
[0026] 5 . . . Cushion pin;
[0027] 7 . . . Blank holder;
[0028] 9 . . . Slider;
[0029] 11 . . . Upper die;
[0030] 20 . . . Sub blank holder unit;
[0031] 21 . . . Mount plate;
[0032] 23 . . . Sub blank holder;
[0033] 25 . . . Elastic member; and
[0034] P . . . Material panel.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0035] An exemplary embodiment of the present invention will
hereinafter be described in detail with reference to the
accompanying drawings.
[0036] Exemplary embodiments described in the present specification
and a configuration shown in the drawings are just an exemplary
embodiment of the present invention, but are not limited to the
spirit and scope of the present invention. Therefore, it should be
understood that there may be various equivalents and modifications
capable of replacing them at the time of filing of the present
application.
[0037] Also, 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.
[0038] FIG. 2 is a cross-sectional view of a press system according
to an exemplary embodiment of the present invention.
[0039] In the press system according to the exemplary embodiment of
the present invention, as shown in FIG. 2, a lower die punch 1
having a lower surface shape of a product panel is mounted on a
lower bolster 3. On the outside of the lower die punch 1, a blank
holder 7 is provided on the bolster 3 through cushion pins 5.
[0040] Further, an upper die 11 having an upper surface shape of
the product panel is mounted on an upper slider 9 over the lower
die punch 1, and a material panel P is put on the blank holder 7
and is pressed to form the product panel.
[0041] Here, the press system according to the exemplary embodiment
of the present invention includes a sub blank holder unit 20
provided inside the lower die punch 1.
[0042] The sub blank holder unit 20 is provided inside the lower
die punch 1 to perform the molding while holding a portion of the
material panel P to be molded into a protrusion shape together with
the upper die 11.
[0043] Each blank holder 7 holds the edge of the material panel P
and then the sub blank holder unit 20 performs the molding while
holding the portion to be molded into the protrusion shape together
with the upper die 11 descended by the slider 9.
[0044] That is, the sub blank holder unit 20 holds the portion of
the material panel P to be molded into the protrusion shape so as
to adjust an input amount of a material (the amount input when the
material is molded), thereby compensating a depth difference
between a deeply molded portion and a shallowly molded portion in a
product panel having a protrusion shape.
[0045] The sub blank holder unit 20 includes a mount plate 21, a
sub blank holder 23, and an elastic member 25.
[0046] First, the mount plate 21 is provided on the bolster 3.
[0047] The sub blank holder 23 is provided to be slidable upward
and downward in the lower die punch 1, and holds a portion of the
material panel P together with the upper die 11.
[0048] Further, at least one elastic member 25 is provided between
the mount plate 21 and the sub blank holder 23 and provides
elasticity to the sub blank holder 23.
[0049] Here, each elastic member 25 may be made of a
gas-cylinder-type spring.
[0050] Further, elastic members 25 are spaced apart from each other
at predetermined intervals and are mounted at equal intervals
between the mount plate 21 and the sub blank holder 23. In the
present exemplary embodiment, three elastic members are mounted at
equal intervals.
[0051] Hereinafter, the operation and effect of the press system
according to the exemplary embodiment of the present invention
configured as described above will be described in detail.
[0052] FIG. 3 is a view illustrating operation states of the press
system according to the exemplary embodiment of the present
invention in stages.
[0053] First, as shown in S10 of FIG. 3, the upper die 11 rises by
the slider 9 and both blank holders 7 rises from the lower die
punch 1 by the cushion pins 9,
[0054] In this case, the sub blank holder 23 of the sub blank
holder unit 20 maintains a state in which the sub blank holder 23
has risen from the lower die punch 1 together with each blank
holder 7 by the elastic member 25.
[0055] In this state, a material panel P is inserted between the
lower die punch 1 and the upper die 11 and is put on the blank
holders 7 and the sub blank holder 23.
[0056] Thereafter, the upper die 11 descends by the slider 9 and
thus the edge of the material panel P is held by a dieface surface
of the upper die 11 and a dieface surface of the blank holder 7 as
shown in S20 of FIG. 3.
[0057] In the state in which the edge of the material panel P is
held by the blank holders 7 and the upper die 11, the upper die 11
continuously descends. Here, the sub blank holder 23 holds a
portion of the material panel P to be molded into a protrusion
shape on the upper die 11 as shown in S30 of FIG. 3.
[0058] In this state, the upper die 11 and the blank holders 7
lower together to press the material panel P against a mold surface
of the lower die punch 1 as shown in S40 of FIG. 3. Therefore, the
material panel P is plastically processed into a product panel by
press molding, as shown in S50 of FIG. 3.
[0059] That is, the blank holders 7 and the sub blank holder 23
sequentially hold the material panel P on the upper die 11 so as to
adjust an input amount of a material before molding starts.
Therefore, a difference in molding depth in the material panel P is
compensated and moldability is secured through volume
securement.
[0060] Therefore, according to the press system according to the
exemplary embodiment of the present invention configured as
described above, it is possible to prevent a molded product panel
from bursting or being torn due to a difference in molding depth
caused by a protrusion shape when the material panel P is
pressed.
[0061] Further, the press system according to the exemplary
embodiment of the present invention holds one side of the material
panel P to be molded into a protrusion shape through the sub blank
holder unit 20 configured inside the lower die punch 1 so as to
perform the molding with a material input amount adjusted.
Therefore, the difference in molding depth caused by the protrusion
shape can be compensated so as to improve moidability and improve
the marketability of the molded product panel.
[0062] 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.
* * * * *