U.S. patent application number 17/288030 was filed with the patent office on 2021-10-07 for method and apparatus for synchronously melting and preparing alloy.
The applicant listed for this patent is SHANGHAI JIAOTONG UNIVERSITY. Invention is credited to Qing Dong, Tao Liu, Baode Sun, Jiao Zhang.
Application Number | 20210310101 17/288030 |
Document ID | / |
Family ID | 1000005707939 |
Filed Date | 2021-10-07 |
United States Patent
Application |
20210310101 |
Kind Code |
A1 |
Zhang; Jiao ; et
al. |
October 7, 2021 |
METHOD AND APPARATUS FOR SYNCHRONOUSLY MELTING AND PREPARING
ALLOY
Abstract
An apparatus for synchronously melting and preparing alloy, the
alloy to be added is made into wire in advance, and the wire
feeding speed required for the preparation of the alloy with a
specific composition is calculated according to the flow rate of
raw molten aluminum in the launder. In the continuous ingot casting
process, the wire is continuously and stably fed into the launder
of the raw molten aluminum at the wire feeding speed, and the alloy
preparation is formed in real time, which is able to avoid specific
gravity segregation caused by the long-term standing of melt, and
realize the preparation of gradient materials while significantly
improving the alloying efficiency. The present disclosure also
relates to a method for synchronously melting and preparing
alloy.
Inventors: |
Zhang; Jiao; (Shanghai,
CN) ; Sun; Baode; (Shanghai, CN) ; Liu;
Tao; (Shanghai, CN) ; Dong; Qing; (Shanghai,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SHANGHAI JIAOTONG UNIVERSITY |
Shanghai |
|
CN |
|
|
Family ID: |
1000005707939 |
Appl. No.: |
17/288030 |
Filed: |
October 22, 2019 |
PCT Filed: |
October 22, 2019 |
PCT NO: |
PCT/CN2019/112402 |
371 Date: |
April 23, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C22C 1/026 20130101;
C22C 1/03 20130101; B22D 41/015 20130101; B22D 11/16 20130101; B22D
1/00 20130101; B22D 7/005 20130101; B22D 21/005 20130101; B22D
11/108 20130101; B22D 21/007 20130101; B22D 21/002 20130101; B22D
11/003 20130101 |
International
Class: |
C22C 1/02 20060101
C22C001/02; B22D 1/00 20060101 B22D001/00; B22D 11/00 20060101
B22D011/00; B22D 7/00 20060101 B22D007/00; C22C 1/03 20060101
C22C001/03 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 14, 2019 |
CN |
201910513397.7 |
Claims
1. A method for synchronously melting and preparing alloy, wherein
an alloy to be added is made into a wire in advance, and a wire
feeding speed required for preparing an alloy with a specific
composition is calculated according to a flow rate of raw molten
aluminum in a launder, wherein in a continuous ingot casting
process, the wire was continuously and stably fed into the launder
of the raw molten aluminum at the wire feeding speed, thereby
real-time forming an alloy preparation.
2. The method for synchronously melting and preparing alloy melting
according to claim 1, wherein the wire is an alloy wire or a pure
metal wire; and an alloy with a high melting point refers to an
alloy with a melting point higher than that of pure aluminum.
3. The method for synchronously melting and preparing alloy
according to claim 1, wherein an alloy with a high melting point
refers to Al--Mn, Al--Fe and Al--Cr.
4. The method for synchronously melting and preparing alloy
according to claim 1, wherein the wire feeding speed Vwire is
determined according to a flow rate V1 of the raw molten aluminum
in the launder, wherein Vwire=kV1, where k is a fixed constant.
5. The method for synchronously melting and preparing alloy
according to claim 1, wherein the real-time forming refers to: in
order to make the wire quickly be dissolved into the raw molten
aluminum, a method of high-frequency instantaneous heating is
applied to melt an alloy with a high melting point while the wire
is being fed, so that a melted alloy is able to be guided and
diverted into the raw molten aluminum, so as to enable rapid mixing
to realize a required concentration of alloying elements.
6. An apparatus for realizing the method according to claim 1,
comprising: a launder for molten aluminum and at least one guiding
tube, which has a wire feeding device and is disposed in the
launder for molten aluminum, wherein the wire feeding device is
disposed at an inlet end of the at least one guiding tube and is
connected with a movement control device, so as to adjust a feeding
speed of the wire, and a temperature control device is disposed at
an outlet end of the at least one guiding tube, so as to adjust a
temperature of the wire when the wire enters the launder for molten
aluminum; and the at least one guiding tube is a hollow curved
tube, with the wire arranged inside, and a bending direction of the
at least one guiding tube is the same as a flow direction of the
molten aluminum in the launder for molten aluminum.
7. The apparatus according to claim 6, wherein a depth of the at
least one guiding tube located inside the launder for molten
aluminum is 1/2.about.2/3 of a depth of the launder.
8. The apparatus according to claim 6, wherein the temperature
control device comprises an electric temperature transmitter
module, an electronic potentiometer module, an electric controller
module and a silicon controlled rectifier voltage regulator module,
wherein a temperature change is measured by a thermocouple, and
converted into 0.about.10 mA of a DC current signal, which is a
standard signal of a model meter, through an electric temperature
transmitter, and the DC current signal is transmitted to an
electronic potentiometer and an electric controller, respectively,
wherein the electric controller outputs 0.about.10 mA of the DC
current signal based on a calculation pursuant to a predetermined
control rule, according to a magnitude and direction of a bias, and
transmits the DC current signal to a silicon controlled rectifier
voltage regulator, thereby adjusting an AC voltage to realize an
automatic control.
9. The method for synchronously melting and preparing alloy
according to claim 2, wherein an alloy with a high melting point
refers to Al--Mn, Al--Fe and Al--Cr.
10. The apparatus according to claim 6, wherein the wire is an
alloy wire or a pure metal wire; and an alloy with a high melting
point refers to an alloy with a melting point higher than that of
pure aluminum.
11. The apparatus according to claim 6, wherein an alloy with a
high melting point refers to Al--Mn, Al--Fe and Al--Cr.
12. The apparatus according to claim 6, wherein the wire feeding
speed Vwire is determined according to a flow rate V1 of the raw
molten aluminum in the launder, wherein Vwire=kV1, where k is a
fixed constant.
13. The apparatus according to claim 6, wherein the real-time
forming refers to: in order to make the wire quickly be dissolved
into the raw molten aluminum, a method of high-frequency
instantaneous heating is applied to melt an alloy with a high
melting point while the wire is being fed, so that a melted alloy
is able to be guided and diverted into the raw molten aluminum, so
as to enable rapid mixing to realize a required concentration of
alloying elements.
Description
TECHNICAL FIELD
[0001] The present disclosure relates to a technology in the field
of alloy manufacturing, and in particular to a method and an
apparatus for synchronously melting and preparing alloy.
BACKGROUND ART
[0002] Generally, aluminum alloys contain a variety of alloying
elements, and corresponding alloy components need to be added to
the raw molten aluminum during the preparation process. The alloy
components can be added in the form of pure metals (such as Mg, Zn,
Cu and Si, among others) or master alloys (such as Al--Fe, Al--Ni,
Al--Zr and Al--Sr, among others). In actual production, all the
alloys are often added in the holding furnace, melted and left to
stand before the casting process. The existing major problem is
that due to the different densities of different types of added
elements, adding alloying elements is likely to cause specific
gravity segregation in a large holding furnace. For instance, Cu
and Zn, which are elements with higher density, concentrate at the
lower part of the holding furnace, while elements with lower
density such as Mg and Li concentrate at the upper part of the
holding furnace. Strong stirring is required to keep the melt
uniform. Notwithstanding, it is still highly likely that the
substandard chemical composition or uneven composition takes place,
resulting in the alloy after melting and preparing with unqualified
quality.
SUMMARY
[0003] In light of the current problems that specific gravity
segregation and uneven distribution of elements is highly likely to
occur in the alloy after melting and preparing in the large holding
furnace, the present disclosure proposes a method and an apparatus
for synchronously melting and preparing alloy, which is able to
avoid specific gravity segregation caused by the long-term standing
of melt, and thus realize the preparation of gradient materials
while significantly improving the alloying efficiency.
[0004] The present disclosure is realized through the following
technical solutions.
[0005] The present disclosure relates to a method for synchronously
melting and preparing alloy. The alloy to be added is made into
wire in advance, and the wire feeding speed required for the
preparation of the alloy with a specific composition is calculated
according to the flow rate of raw molten aluminum in the launder.
In the continuous ingot casting process, the wire is continuously
and stably fed into the launder of the raw molten aluminum at the
wire feeding speed, thereby real-time forming the alloy
preparation.
[0006] The wire is alloy wire or pure metal wire.
[0007] As for the wire feeding speed, the wire feeding speed
V.sub.wire is determined according to the flow rate V.sub.1 of the
molten aluminum in the launder, i.e., V.sub.wire=kV.sub.1, where k
is a fixed constant.
[0008] The real-time forming refers to: in order to make the wire
quickly be dissolved into the raw molten aluminum, the method of
high-frequency instantaneous heating is applied to melt the alloy
with high melting point while the wire is being fed, so that the
melted alloy can be guided and diverted into the molten aluminum to
enable rapid mixing to realize the required concentration of the
alloying elements.
[0009] The alloy with high melting point refers to an alloy with a
melting point higher than that of pure aluminum, such as Al--Mn,
Al--Fe, Al--Cr and the like.
[0010] The present disclosure relates to an apparatus for realizing
the above method, comprising: a launder for molten aluminum and at
least one guiding tube having a wire feeding device disposed in the
launder for molten aluminum, wherein the wire feeding device is
disposed at the inlet end of the guiding tube and is connected with
a movement control device, so as to adjust the feeding speed of the
wire, and a temperature control device is disposed at the outlet
end of the guiding tube, so as to adjust the temperature of the
wire when the wire enters the launder for molten aluminum.
[0011] The guiding tube is a hollow curved tube, with the wire
arranged inside, and the bending direction of the guiding tube is
the same as the flow direction of the molten aluminum in the
launder for molten aluminum.
[0012] The depth of the guiding tube inside the launder for molten
aluminum is determined according to the depth of the launder, and
is preferably 1/2.about.2/3 of the depth of the launder.
[0013] The movement control device comprises: a movement controller
module, and a driver module, an execution module and a feedback
sensor module, which are connected to the movement controller
module, respectively, wherein the driver module converts the
control command from the movement controller into a current or
voltage to control electrical level, and the feedback sensor module
outputs the position of the execution module to the movement
controller.
[0014] The temperature control device comprises: an electric
temperature transmitter module, an electronic potentiometer module,
an electric controller module and a silicon controlled rectifier
voltage regulator module, wherein the temperature change is
measured by a thermocouple, and converted into 0-10 mA of DC
current signal, which is standard signal of model meter, through
the electric temperature transmitter; then the DC current signal is
transmitted to the electronic potentiometer for recording, and at
the same time transmitted to the electric controller, wherein the
controller outputs a 0.about.10 mA of DC current signal and
transmits the same to the silicon controlled rectifier voltage
regulator after a calculation, which is according to the magnitude
and direction of the bias and pursuant to the predetermined control
rule. Then AC voltage is adjusted to realize automatic control.
BRIEF DESCRIPTION OF DRAWINGS
[0015] FIG. 1 is a schematic diagram of the apparatus of the
present disclosure;
[0016] where 1 wire feeding device, 2 wire, 3 ceramic guiding tube,
4 high frequency induction coil, 5 launder, 6 movement control
device, 7 temperature control device, 8 molten drop, 9 raw molten
aluminum.
DETAILED DESCRIPTION OF EMBODIMENTS
Embodiment 1
[0017] As indicated in FIG. 1, the present embodiment relates to
the synchronously melting and preparing alloy, comprising: several
sets of guiding tube 3 having wire feeding device 1, wherein the
outlet end of each of the guiding tubes 3 is disposed in the
launder 5 and outlet end of each of the guiding tubes 3 is provided
with a high frequency induction coil 4 connected to the temperature
control device 7. The wire feeding device 1 is connected to the
movement control device 6, so as to control the speed of the wire 2
entering the launder 5, and the outlet end of the guiding tube 3,
heated by the high frequency induction coil 4, melts the wire 2
into molten drops 8 and introduces the same into the raw molten
aluminum 9.
[0018] The guiding tubes 3 are immersed in the raw molten aluminum
9.
[0019] During the alloying process, the raw molten aluminum flows
stably in the launder at the speed of v.sub.L (<3 m/s); the
alloy wire required to be added, which has a diameter of d.sub.1,
d.sub.2, d.sub.3 (<30 mm), respectively, is fed into the ceramic
guiding tubes through the wire feeding devices at the speed of
v.sub.1, v.sub.2, v.sub.3 (<5 m/s), respectively. The wire
feeding speed is correlated with the concentration level of this
element in the ingot to be prepared, and is controlled by the
movement control device. Driven by the wire feeding device, the
alloy wire moves downward in the ceramic guiding tube. The high
frequency induction coils are controlled by the temperature control
device to heat the corresponding local areas up to the temperatures
of T.sub.1, T.sub.2, T.sub.3 (>melting point of the alloy wire),
respectively, such that the alloy wire is rapidly melted to form
molten drops, and the formed molten drops continue to enter into
the raw molten aluminum along the ceramic guiding tubes, thereby
achieving the alloying and uniform distribution along with the
movement of the raw molten aluminum.
[0020] The guiding tube 3 having the wire feeding device 1 may be
determined according to the number of elements to be added, and
multiple sets can work simultaneously to achieve the online
alloying of multiple alloying elements at the same time. After the
alloying is completed, the alloy melt can enter the casting
apparatus for casting to form an ingot.
[0021] In this embodiment, the Al--Mg--Si alloy was prepared by the
above-mentioned apparatus: the raw molten aluminum was controlled
to flow stably in the launder at the speed of 0.22 m/s, and the
pure magnesium wire with a diameter of 1.8 mm and the Al-20Si alloy
wire with a diameter of 3.0 mm were fed into the ceramic guiding
tubes by the wire feeding devices at speeds of 1.8 cm/s and 2.6
cm/s, respectively. Driven by the wire feeding devices, the alloy
wire moved downward in the ceramic guiding tubes. The high
frequency induction coils were controlled by the temperature
control device to heat the corresponding local areas up to the
temperatures of 700.degree. C. and 720.degree. C., respectively,
such that the alloy wire was rapidly melted to form molten drops,
and the formed molten drops continued to enter into the raw molten
aluminum along the ceramic guiding tubes, thereby achieving the
alloying and uniform distribution along with the movement of the
raw molten aluminum. The alloy melt entered the casting apparatus
for casting to form Al--Mg--Si alloy ingot.
Embodiment 2
[0022] In this embodiment, the Al--Zn--Mg--Cu alloy with
composition gradient was prepared by the above-mentioned apparatus:
the raw molten aluminum was controlled to flow stably in the
launder at the speed of 0.28 m/s, and pure zinc wire with a
diameter of 4.0mm, pure magnesium wire with a diameter of 1.8mm,
and an Al-20 Cu alloy wire with a diameter of 1.5 mm were fed into
the ceramic guiding tubes by the wire feeding devices at speeds of
2.2 cm/s, 2.5 cm/s and 1.8 mm/s, respectively. Driven by the wire
feeding devices, the alloy wire moved downward in the ceramic
guiding tubes. The high frequency induction coils were controlled
by the temperature control device to heat the corresponding local
areas up to the temperatures of 460.degree. C., 700.degree. C. and
740.degree. C., respectively, such that the alloy wire was rapidly
melted to form molten drops, and the formed molten drops continued
to enter into the raw molten aluminum along the ceramic guiding
tubes, thereby achieving the alloying and uniform distribution
along with the movement of the raw molten aluminum. The alloy melt
entered the casting apparatus for casting to form Al--Zn--Mg--Cu
alloy ingot. During the preparation process, the wire feeding speed
of the pure zinc wire was uniformly reduced (wherein the wire
feeding speed is reduced by 0.1 cm/s every 5 minutes), and the wire
feeding speed of the pure zinc wire was reduced to 1.0 cm/s after
the casting was completed. Tests indicate that the zinc content of
the prepared alloy was 6.5% at the head of the ingot and 3% at the
tail of the ingot, with a uniform gradient change from the head to
the tail of the ingot.
[0023] The specific embodiments above may be partially adjusted by
those skilled in the art in different ways without departing from
the principle and purpose of the present disclosure. The protection
scope of the present disclosure should be subject to the claims and
is not limited by the specific embodiments above. All
implementation solutions within the scope thereof are bound by the
present disclosure.
* * * * *