U.S. patent application number 15/560038 was filed with the patent office on 2018-03-15 for multi-station continuous hot stamping production line and method.
This patent application is currently assigned to WUHAN UNIVERSITY OF TECHNOLOGY. The applicant listed for this patent is WUHAN UNIVERSITY OF TECHNOLOGY. Invention is credited to Dingguo DAI, Lin HUA, Jue LU, Yuhan SHEN, Yanli SONG, Genpeng ZHU.
Application Number | 20180071806 15/560038 |
Document ID | / |
Family ID | 54984618 |
Filed Date | 2018-03-15 |
United States Patent
Application |
20180071806 |
Kind Code |
A1 |
SONG; Yanli ; et
al. |
March 15, 2018 |
MULTI-STATION CONTINUOUS HOT STAMPING PRODUCTION LINE AND
METHOD
Abstract
A production line sequentially includes a feeding platform, a
feeding robot, a pressing unit, a conveying robot, a quenching
device, a discharging robot, and a conveyor belt. The pressing unit
includes a heating device, a die device, and at least one press
used for mounting the die device. The heating device is used for
wholly or partially heating the preformed blank to produce a hot
blank, and the die device is used for stamping the hot blank,
holding the hot blank at a certain pressure, and shaving and
punching the hot blank, so as to produce a hot stamped part. The
production line can continuously achieve rapid heating, stamping,
pressure holding, shaving, punching, and quenching. Heating
efficiency is improved, and a transferring process before stamping
the hot blank is avoided.
Inventors: |
SONG; Yanli; (WUHAN, HUBEI,
CN) ; HUA; Lin; (WUHAN, HUBEI, CN) ; SHEN;
Yuhan; (WUHAN, HUBEI, CN) ; DAI; Dingguo;
(WUHAN, HUBEI, CN) ; ZHU; Genpeng; (WUHAN, HUBEI,
CN) ; LU; Jue; (WUHAN, HUBEI, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
WUHAN UNIVERSITY OF TECHNOLOGY |
WUHAN, HUBEI |
|
CN |
|
|
Assignee: |
WUHAN UNIVERSITY OF
TECHNOLOGY
WUHAN, HUBEI
CN
|
Family ID: |
54984618 |
Appl. No.: |
15/560038 |
Filed: |
July 5, 2016 |
PCT Filed: |
July 5, 2016 |
PCT NO: |
PCT/CN2016/088614 |
371 Date: |
September 20, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B21D 37/16 20130101;
B21D 43/05 20130101; B21D 22/022 20130101; B21D 35/005 20130101;
B21D 53/88 20130101; B21D 43/105 20130101; C21D 9/0018 20130101;
C21D 9/00 20130101; C21D 1/673 20130101 |
International
Class: |
B21D 22/02 20060101
B21D022/02; B21D 37/16 20060101 B21D037/16; B21D 43/10 20060101
B21D043/10 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 29, 2015 |
CN |
201510715632.0 |
Claims
1. A multi-station continuous hot stamping production line,
characterized in that the production line sequentially comprises a
feeding platform, a feeding robot, a pressing unit, a conveying
robot, a quenching device, a discharging robot, and a conveyor
belt, wherein: the feeding platform is used for placing a preformed
blank, the feeding robot is used for transferring the preformed
blank to the pressing unit, the pressing unit includes a heating
device, a die device, and at least one press used for mounting the
die device, wherein the heating device is used for wholly or
partially heating the preformed blank to produce a hot blank, and
the die device is used for stamping the hot blank, holding the hot
blank at a certain pressure, and shaving and punching the hot
blank, so as to produce a hot stamped part, the conveying robot is
used for conveying the hot stamped part to the quenching device,
the quenching device is used for quenching the hot stamped part,
and the discharging robot is used for transferring a quenched
workpiece to the conveyor belt.
2. The production line according to claim 1, characterized in that
the heating device is an electrical heating device which comprises
a power supply, electrodes, and insulating members, wherein: the
electrodes are mounted on the insulating members and are located at
upper and lower sides of the preformed blank, and portions of the
electrodes located at either the lower side or the upper side of
the preformed blank are connected with the power supply, wherein in
a power-on state, the power supply, the electrodes, and the
preformed blank together form an electrically conductive loop, and
a current flows through the preformed blank and produces joule heat
which heats the preformed blank.
3. The production line according to claim 1, characterized in that
the heating device is a laser heating device which comprises a
laser head, and a laser that is connected with the laser head,
wherein: the laser head is used to produce a high-energy laser beam
to heat the preformed blank.
4. The production line according to claim 1, characterized in that
the heating device is an induction heating device which comprises
an induction coil, and an iron core disposed in the induction coil,
wherein: in a power-on state, the induction coil and the iron core
produce an alternating magnetic field, and the preformed blank
generates an induced current in presence of the alternating
magnetic field and is thus heated.
5. The production line according to claim 1, characterized in that
the die device comprises a stamping-shaving punching progressive
die, and provided is one press which is called press A, wherein:
the stamping-shaving punching progressive die is mounted on the
press A.
6. The production line according to claim 1, characterized in that
the die device comprises a hot forming die and a shaving punching
die, and provided are two presses which are press B and press C,
respectively, wherein: both the hot forming die and the heating
device are mounted on the press B, and the shaving punching die is
mounted on the press C, and the press B and the press C are
provided therebetween with a robot.
7. The production line according to claim 1, characterized in that
the quenching device includes a quenching chamber, and a movable
clamping member and a spraying member that are provided in the
quenching chamber, wherein: the movable clamping member is mounted
slidably at top of the quenching chamber and is used to transfer
the hot stamped part grasped by the conveying robot to the
discharging robot, and the spraying member is used to spray a
quenching medium onto the hot stamped part in motion.
8. The production line according to claim 1, characterized in that
the quenching device includes a quenching bath which is provided
therein with a quenching medium.
9. The production line according to claim 1, characterized in that
the preformed blank is made of a material selected from a group
including, but not limited to, ultra-high-strength sheet steel,
high-strength sheet steel, sheet metal of aluminum alloy, or sheet
metal of titanium alloy.
10. A multi-station continuous hot stamping method, characterized
in that the method comprises: a heating step S1, during which a
feeding robot grasps a preformed blank from a feeding platform and
places the preformed blank on a die device, and then the preformed
blank is immediately heated wholly or partially by a heating device
to a stamping temperature to produce a hot blank; a stamping and
pressure holding step S2, during which the die device stamps the
hot blank and holds the hot blank at a certain pressure for 2 s to
5 s, so as to obtain a hot stamped part; a shaving and punching
step S3, during which the die device shaves and punches the hot
stamped part; a quenching step S4, during which a conveying robot
grasps the hot stamped part and transfers the hot stamped part to a
quenching device in which the hot stamped part is quenched; and a
cooling step S5, during which a discharging robot transfers a
quenched hot stamped part to a conveyor belt and the hot stamped
part is then cooled in air.
Description
FIELD OF THE INVENTION
[0001] The present disclosure relates generally to the technical
field of hot stamping, and in particular, to a multi-station
continuous hot stamping production line and a method of operating
the same.
BACKGROUND OF THE INVENTION
[0002] Hot stamping is a new technology for forming light-weight
and high-strength parts. It has advantages of being able to produce
stamped parts having small springback ratio, good fittability and
high dimensional accuracy. Use of stamped car parts made of
light-weight and high-strength sheet materials can help to improve
safety performance of cars and reduce weight of cars, thereby
contributing to achievement of light weight of cars.
[0003] In a traditional hot stamping process, a preformed blank
made of a light-weight and high-strength sheet material is first
heated to a hot stamping temperature; then the heated blank is
rapidly transferred to a die, immediately stamped, held at a
pressure, and quenched to complete a structural transformation
thereof; after that, the hot stamped part is cooled at room
temperature, and finally cut by a laser to produce a product.
[0004] A hot stamping production line generally comprises a feeding
platform, a manipulator, a heating furnace, a transmission system,
a press, and a laser cutting system. At present, hot stamping
technologies studied in China are mainly used on
ultra-high-strength sheet steel. Existing hot stamping production
lines have the following problems. First, because a blank of
ultra-high-strength sheet steel is usually heated in a roller
hearth heating furnace, a large amount of heat can be lost in a
shaft and in air, which may decrease the heating efficiency.
Second, transferring process of the blank prolongs the production
period, and meanwhile the hot blank is contacted with air, which
results in great heat loss and oxidation (oxidation is particularly
true of bare sheets that are widely used in China). An oxide
coating formed on the sheet can easily wear a surface of the
stamping die. Third, the quenched hot stamped part has an
ultra-high strength and rigidity and is usually cut using a laser
in practice which is very time-consuming and costing. For bare
sheet hot stamping, a subsequent shot peening operation is
required. In other countries, researches are also being done of hot
stamping of aluminum alloy sheets, which, however, has same
problems such as low heating efficiency, time-consuming hot blank
transferring, rapid cooling of the hot blank, etc. It is urgent to
solve these problems in order to improve production efficiency and
achieve continuous, rapid, and stable production.
SUMMARY OF THE INVENTION
[0005] The objective of the present disclosure is to provide a
multi-station continuous stamping production line and method, which
can continuously achieve rapid heating, stamping, pressure holding,
shaving, punching, and quenching, and enhance production
efficiency. Heating efficiency is improved, and a transferring
process before stamping the hot blank is avoided. For a hot stamped
part made of sheet steel, punching and shaving thereof at high
temperature avoids an increase of cutting difficulty caused by
formation of martensites at normal temperatures. Punching and
shaving forces are decreased and desired cutting edges can be
obtained.
[0006] In order to achieve the above objective, the present
disclosure provides the following technical solutions.
[0007] A multi-station continuous hot stamping production line is
provided. The production line sequentially comprises a feeding
platform, a feeding robot, a pressing unit, a conveying robot, a
quenching device, a discharging robot, and a conveyor belt. The
feeding platform is used for placing a preformed blank. The feeding
robot is used for transferring the preformed blank to the pressing
unit. The pressing unit includes a heating device, a die device,
and at least one press used for mounting the die device, wherein
the heating device is used for wholly or partially heating the
preformed blank to produce a hot blank, and the die device is used
for stamping the hot blank, holding the hot blank at a certain
pressure, and shaving and punching the hot blank, so as to produce
a hot stamped part. The conveying robot is used for conveying the
hot stamped part to the quenching device. The quenching device is
used for quenching the hot stamped part, and the discharging robot
is used for transferring a quenched workpiece to the conveyor
belt.
[0008] According to the above technical solution, the heating
device is an electrical heating device which comprises a power
supply, electrodes, and insulating members. The electrodes are
mounted on the insulating members and are located at upper and
lower sides of the preformed blank, and portions of the electrodes
located at either the lower side or the upper side of the preformed
blank are connected with the power supply. In a power-on state, the
power supply, the electrodes, and the preformed blank together form
an electrically conductive loop, and a current flows through the
preformed blank and produces joule heat which heats the preformed
blank.
[0009] According to the above technical solution, the heating
device is a laser heating device which comprises a laser head, and
a laser that is connected with the laser head. The laser head is
used to produce a high-energy laser beam to heat the preformed
blank.
[0010] According to the above technical solution, the heating
device is an induction heating device which comprises an induction
coil, and an iron core disposed in the induction coil. In a
power-on state, the induction coil and the iron core produce an
alternating magnetic field, and the preformed blank generates an
induced current in presence of the alternating magnetic field and
is thus heated.
[0011] According to the above technical solution, the die device
comprises a stamping-shaving punching progressive die, and provided
is one press which is called press A. The stamping-shaving punching
progressive die is mounted on the press A.
[0012] According to the above technical solution, the die device
comprises a hot forming die and a shaving punching die, and
provided are two presses which are press B and press C,
respectively. Both the hot forming die and the heating device are
mounted on the press B, and the shaving punching die is mounted on
the press C. The press B and the press C are provided therebetween
with a robot.
[0013] According to the above technical solution, the quenching
device includes a quenching chamber, and a movable clamping member
and a spraying member that are provided in the quenching chamber.
The movable clamping member is mounted slidably at top of the
quenching chamber and is used to transfer the hot stamped part
grasped by the conveying robot to the discharging robot, and the
spraying member is used to spray a quenching medium onto the hot
stamped part in motion.
[0014] According to the above technical solution, the quenching
device includes a quenching bath which is provided therein with a
quenching medium.
[0015] According to the above technical solution, the preformed
blank is made of a material selected from a group including, but
not limited to, ultra-high-strength sheet steel, high-strength
sheet steel, sheet metal of aluminum alloy, or sheet metal of
titanium alloy.
[0016] The present disclosure further provides a multi-station
continuous hot stamping method, which comprises:
[0017] a heating step S1, during which a feeding robot grasps a
preformed blank from a feeding platform and places the preformed
blank on a die device, and then the preformed blank is immediately
heated wholly or partially by a heating device to a stamping
temperature to produce a hot blank;
[0018] a stamping and pressure holding step S2, during which the
die device stamps the hot blank and holds the hot blank at a
certain pressure for 2 s to 5 s, so as to obtain a hot stamped
part;
[0019] a shaving and punching step S3, during which the die device
shaves and punches the hot stamped part;
[0020] a quenching step S4, during which a conveying robot grasps
the hot stamped part and transfers the hot stamped part to a
quenching device in which the hot stamped part is quenched; and
[0021] a cooling step S5, during which a discharging robot
transfers a quenched hot stamped part to a conveyor belt and the
hot stamped part is then cooled in air.
[0022] The present disclosure achieves the following beneficial
effects. By providing the heating device on the press, the
preformed blank can be rapidly heated and then stamped at a same
place, which achieves a high heating efficiency and speed. In this
way, a transferring process before stamping of the hot blank and a
transferring device are avoided. Besides, heat loss and air
oxidation are reduced. This greatly improves energy utilization and
heating efficiency, and ensures surface quality of the hot blank.
In addition, in the present disclosure, punching and shaving of the
hot stamped part are performed prior to pressure holding and
quenching when the strength and rigidity of punching and shaving
areas are low, by way of which punching and shaving forces can be
reduced and service life of the punching shaving die can be
prolonged, and at the same time, a laser cutting process is not
used and the production cost is decreased. Furthermore, because a
metal material can bear a larger shear force at high temperature
due to its improved plasticity, punching and shaving at high
temperature can ensure quality of the punching and shaving, and
obtain desired cutting edges. Geometrical shapes and dimensional
accuracy of hot stamped part can thus be ensured. While decreasing
the production cost, the present disclosure also greatly shortens
the production time, thereby improving production efficiency.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The present disclosure will be described in a more detailed
way below in conjunction with the accompanying drawings and
embodiments.
[0024] FIG. 1 schematically shows structure of a first embodiment
of the present disclosure.
[0025] FIG. 2 schematically shows structure of a second embodiment
of the present disclosure.
[0026] FIG. 3 schematically shows structure of a third embodiment
of the present disclosure.
[0027] FIG. 4 schematically shows structure of a fourth embodiment
of the present disclosure.
[0028] FIG. 5 schematically shows a flow chart of an embodiment of
the present disclosure.
[0029] FIG. 6 schematically shows structure of an electrical
heating device of an embodiment of the present disclosure.
[0030] FIG. 7 schematically shows structure of a laser heating
device of an embodiment of the present disclosure.
[0031] FIG. 8 schematically shows structure of an induction heating
device of an embodiment of the present disclosure.
LIST OF REFERENCES
[0032] 1--preformed blank; 2--feeding platform; 3--feeding robot;
4--press A; 5--conveying robot; 6--quenching chamber; 61--movable
clamping member; 62--spraying member; 7--discharging robot;
8--conveyor belt; 9--press B; 10--robot; 11--press C; 12--quenching
bath; 13--bracket; 14--forming concave die; 15--forming convex die;
16--shaving concave die; 17--punching convex die; 18--power supply;
19--electrode; 20--insulating member; 21--laser beam; 22--laser
head; 23--laser; 24--induction coil; 25--iron core.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0033] The present disclosure will be further explained below in
connection with the accompanying drawings and embodiments so that
the objectives, the technical solutions, and advantages of the
present disclosure can be clearer. It should be appreciated that
the specific embodiments described below are intended only for
explaining, rather than, limiting the present disclosure.
[0034] As shown in FIGS. 1 to 5, a multi-station continuous hot
stamping production line comprises a feeding platform 2, a feeding
robot 3, a pressing unit, a conveying robot 5, a quenching device,
a discharging robot 7, and a conveyor belt 8. The feeding platform
2 is used for placing a preformed blank 1 after blanking. The
feeding robot 3 is used for transferring the preformed blank 1 to
the pressing unit. The pressing unit includes a heating device, a
die device, and at least a press used for mounting the die device.
The heating device is used for wholly or partially heating the
preformed blank to produce a hot blank. The die device is used for
stamping the hot blank, holding the hot blank at a certain
pressure, and shaving and punching the hot blank, so as to produce
a hot stamped part. The conveying robot 5 is used for conveying the
stamped part to the quenching device. The quenching device is used
to quenching the hot stamped part. The discharging robot 7 is used
for transfer a quenched workpiece to the conveyor belt 8.
[0035] In a preferred embodiment of the present disclosure, as
shown in FIG. 6, the heating device is an electrical heating device
which comprises a power supply 18, electrodes 19, and insulating
members 20. The electrodes 19 are mounted on the insulating members
20 and are located at upper and lower sides of the preformed blank.
Portions of the electrodes 19 located at either the lower side or
the upper side of the preformed blank 1 are connected with the
power supply 18. In a power-on state, the power supply 18, the
electrodes 19, and the preformed blank together form an
electrically conductive loop. In this way, a current flows through
the preformed blank and produces joule heat which heats the
preformed blank.
[0036] In a preferred embodiment of the present disclosure, as
shown in FIG. 7, the heating device is a laser heating device which
comprises a laser head 22, and a laser 23 that is connected with
the laser head 22. The laser head 22 is configured to produce a
high-energy laser beam 21 which heats the preformed blank.
[0037] In a preferred embodiment of the present disclosure, as
shown in FIG. 8, the heating device is an induction heating device
which comprises an induction coil 24, and an iron core 25 that is
provided in the induction coil 24. In a power-on state, the
induction coil 24 and the iron core 25 produce an alternating
magnetic field, and the preformed blank generates an induced
current in presence of the alternating magnetic field. The
preformed blank is thus heated.
[0038] In a preferred embodiment of the present disclosure, as
shown in FIGS. 1, 3, and 5, the die device comprises a
stamping-shaving punching progressive die, and provided is one
press which is called press A4. The stamping-shaving punching
progressive die is mounted on the press A4 on which the heating
device is also mounted.
[0039] In a preferred embodiment of the present disclosure, as
shown in FIGS. 2, 4, and 5, the die device comprises a hot forming
die and a shaving punching die, and provided are two presses which
are press B9 and press C11, respectively. Both the hot forming die
and the heating device are mounted on the press B9, and the shaving
punching die is mounted on the press C11. The press B9 and the
press C11 are provided therebetween with a robot 10.
[0040] In a preferred embodiment of the present disclosure, as
shown in FIGS. 1 and 2, the quenching device includes a quenching
chamber 6, and a movable clamping member 61 and a spraying member
62 that are provided in the quenching chamber 6. The movable
clamping member 61 is mounted slidably at top of the quenching
chamber 6 and is used to transfer the hot stamped part grasped by
the conveying robot 5 to the discharging robot 7. The spraying
member 62 is used to spray a quenching medium to the hot stamped
part in motion.
[0041] In a preferred embodiment of the present disclosure, as
shown in FIGS. 3 and 4, the quenching device includes a quenching
bath 12 which is provided therein with a quenching medium.
[0042] In a preferred embodiment of the present disclosure, the
preformed blank is made of a material selected from a group
including, but not limited to, ultra-high-strength sheet steel,
high-strength sheet steel, sheet metal of aluminum alloy, or sheet
metal of titanium alloy.
[0043] Accordingly, the production line can continuously achieve
rapid heating, stamping, pressure holding, shaving, punching, and
quenching. Heating efficiency is improved, and a transferring
process before stamping the hot blank is avoided. For a hot stamped
part made of sheet steel, punching and shaving thereof at high
temperature avoids an increase of cutting difficulty caused by
formation of martensites at normal temperatures, and punching and
shaving forces are decreased and desired cutting edges can be
obtained.
[0044] The present disclosure further provides a multi-station
continuous hot stamping method, which comprises the following
steps.
[0045] Step S1: Heating
[0046] A feeding robot grasps a preformed blank from a feeding
platform and places the preformed blank on a die device. Then, the
preformed blank is immediately heated wholly or partially by a
heating device to a stamping temperature to produce a hot
blank.
[0047] Step S2: Stamping and Pressure Holding
[0048] The die device is used to stamp the hot blank and hold the
hot blank at a certain pressure for 2 s to 5 s, so as to obtain a
hot stamped part.
[0049] Step S3: Shaving and Punching
[0050] The die device is used to shave and punch the hot stamped
part.
[0051] Step S4: Quenching
[0052] A conveying robot grasps the hot stamped part and transfers
it to a quenching device in which the hot stamped part is
quenched.
[0053] Step S5: Cooling
[0054] A discharging robot transfers a quenched hot stamped part to
a conveyor belt where the hot stamped part is cooled in air.
[0055] Two solutions are provided for the die device. The number of
presses used matches the types of the die device. The quenching
device is used for quenching the hot stamped part through two
approaches, spraying and soaking. The present disclosure therefore
can at least provide four types of production lines.
[0056] As shown in FIG. 1, a multi-station continuous hot stamping
production line I sequentially comprises a feeding platform 2, a
feeding robot 3, a press A4, a conveying robot 5, a quenching
chamber 6, a discharging robot 7, and a conveyor belt 8. A heating
device and a stamping-shaving punching progress die are mounted on
the press A4.
[0057] As shown in FIG. 2, a multi-station continuous hot stamping
production line II sequentially comprises a feeding platform 2, a
feeding robot 3, a press B9, a robot 10, a press C11, a conveying
robot 5, a quenching chamber 6, a discharging robot 7, and a
conveyor belt 8. A heating device and a hot forming die are mounted
on the press B9. A shaving punching die is mounted on the press
C11.
[0058] As shown in FIG. 3, a multi-station continuous hot stamping
production line III sequentially comprises a feeding platform 2, a
feeding robot 3, a press A4, a conveying robot 5, a quenching bath
12, a discharging robot 7, and a conveyor belt 8. A heating device
and a stamping-shaving punching progress die are mounted on the
press A4.
[0059] As shown in FIG. 4, a multi-station continuous hot stamping
production line IV sequentially comprises a feeding platform 2, a
feeding robot 3, a press B9, a robot 10, a press C11, a conveying
robot 5, a quenching bath 12, a discharging robot 7, and a conveyor
belt 8. A heating device and a hot forming die are mounted on the
press B9. A shaving punching die is mounted on the press C11.
[0060] In the present disclosure, the heating device is used to
heat the performed blank wholly or partially. Heating methods may
include electrical heating, induction heating, laser heating, or
others. The stamping-shaving punching progressive die is used for
stamping the preformed blank, holding the hot stamped part at a
certain pressure, and shaving and punching the hot stamped part.
The hot forming die is used for stamping the preformed blank, and
holding the hot stamped part at a certain pressure. The shaving
punching die is used for shaving and punching the hot stamped part.
The quenching chamber is used for spray quenching, and is provided
therein with a movable clamping member and a spraying member. The
movable clamping member is used for clamping and moving the hot
stamped part, and the spraying member is used for spraying a
quenching medium onto a moving hot stamped part. The quenching bath
is used for soak quenching, and is provided therein with a
quenching medium into which a shaved and punched hot stamped part
is soaked to complete the quenching process. All the robots in the
present disclosure are multi-link manipulators or linear robots,
which are used for transferring, feeding, or discharging of
preformed blanks or hot stamped parts.
[0061] In the present disclosure, as shown in FIG. 5, the die
device includes a bracket 13, a forming concave die 14, and a
forming convex die 15 that matches the forming concave die 14, a
shaving concave die 16, and a punching convex die 17.
[0062] As shown in FIG. 5, the multi-station continuous hot
stamping method specifically comprises the following steps.
[0063] Step I: Heating
[0064] The feeding robot 3 grasps the preformed blank from the
feeding platform and places the preformed blank on the bracket 13.
Then, the preformed blank is immediately heated wholly or partially
by the heating device to a stamping temperature to produce a hot
blank.
[0065] Step II: Stamping and Pressure Holding
[0066] The forming concave die 14 descends to join the forming
convex die 15, so as to stamp the hot blank on the bracket 13 and
hold the hot blank at a certain pressure for 2 s to 5 s, thus
obtaining a hot stamped part.
[0067] Step III: Shaving and Punching
[0068] The shaving concave die 16 and the punching convex die 17
descend so as to shave and punch the hot stamped part.
[0069] Step IV: Quenching
[0070] The conveying robot grasps a shaved and punched hot stamped
part and placed the hot stamped part onto the movable clamping
member 61 in the quenching chamber. The movable clamping member 61
clamps the hot stamped part tightly and moves along a guiding rail.
The spraying member 62 quenches the hot stamped part in motion by
spraying a quenching medium. Alternatively, the conveying robot
grasps the shaved and punched hot stamped part and soaked the hot
stamped part in the quenching bath 12 for quenching.
[0071] Step VI: Cooling
[0072] The discharging robot 7 transfers the quenched hot stamped
part to the conveyor belt 8 for a subsequent process, and meanwhile
the hot stamped part is cooled in air.
[0073] The above steps altogether form an entire process.
Continuous production can be achieved by repeating these steps.
[0074] The present disclosure abandons processes in traditional hot
stamping technologies in which the three operations of sheet
material heating, forming and quenching, and shaving and punching
are separated, and achieves multi-station continuous production of
heating-forming-punching-quenching of hot stamped parts.
[0075] It should be appreciated that one skilled in the art can
make improvements on or variations to the present disclosure
according to the above description, but all such improvements or
variations shall fall within the protection scopes of the claims of
the present disclosure.
* * * * *