CN107620017A - A kind of Technology for Heating Processing of aluminium alloy castings - Google Patents
A kind of Technology for Heating Processing of aluminium alloy castings Download PDFInfo
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- CN107620017A CN107620017A CN201710924510.1A CN201710924510A CN107620017A CN 107620017 A CN107620017 A CN 107620017A CN 201710924510 A CN201710924510 A CN 201710924510A CN 107620017 A CN107620017 A CN 107620017A
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Abstract
The invention discloses a kind of Technology for Heating Processing of aluminium alloy castings, it is related to metal casting technique field, it comprises the following steps：（1）Vacuum homogenizes the pre-heat treatment；（2）Normalizing；（3）Secondary normalizing；（4）High tempering；（5）Vacuum hardening；（6）Annealing.The aluminium alloy castings Technology for Heating Processing of the present invention is abundant so as to enable aluminum alloy to the structural transformation of casting by properly increasing heating-up temperature and extending soaking time, effectively improves its mechanical performance and impact flexibility, suitable popularization and application.
Description
Technical field
The present invention relates to metal casting technique field, and in particular to a kind of Technology for Heating Processing of aluminium alloy castings.
Background technology
Cast aluminium alloy gold, due to the features such as its density is small, specific strength is high, is widely used in as traditional metal material
The every profession and trades such as space flight, aviation, automobile, machinery, and with the development of modern industry and casting technology, to cast aluminium alloy gold demand
Measure increasing.Simultaneously with the development of high-performance aerospace aircraft, its internals is also towards large scale, required precision
The high direction of high, complicated, metallurgical mechanical property requirements is developed, to the integrated of all kinds of aluminium alloy elements, lightweight, reliable
Property proposes higher requirement.Conventional aluminium alloy due to Technology for Heating Processing flow and the chemical composition element accounting of itself not
Together, and then cause the aluminium alloy castings mechanical performance of finished product insufficient, especially widely used automotive material field, its impact resistance
There is potential safety hazard in property, can not meet functional need, therefore, it is necessary to improve.
The content of the invention
For problems of the prior art, the invention provides a kind of Technology for Heating Processing of aluminium alloy castings, this kind
Technology for Heating Processing is by properly increasing heating-up temperature and extending soaking time, so as to enable aluminum alloy to the structural transformation of casting
Fully, its mechanical performance and impact flexibility, suitable popularization and application are effectively improved.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of Technology for Heating Processing of aluminium alloy castings, is followed the steps below：
（1）Vacuum homogenizes the pre-heat treatment：Aluminium alloy castings after casting is placed in high-temperature vacuum furnace and homogenizes preheating
Handle 2.5-4h；
The aluminium alloy castings includes following composition by weight percentage：C 0.48-1.20%, Fe 3.20-4.80%, Si
1.45-2.65%, Mn 3.35-5.05%, Cu 2.10-3.20%, Mg 1.70-2.50%, Zn 2.70-4.30%, Ni 0.24-
0.60%, Ti 0.28-0.44%, Sb 0.15-0.30%, surplus are Al and not removable trace element；
（2）Normalizing；Aluminium alloy castings after the pre-heat treatment is delivered to normalizing furnace and carries out a normalized treatment, the normalizing
The heating rate of stove is 15-25 DEG C/min；
（3）Secondary normalizing；Aluminium alloy castings after normalizing is delivered to normalizing furnace and carries out secondary normalizing processing, the normalizing
The heating rate of stove is 20-30 DEG C/min；
（4）High tempering：Aluminium alloy castings after normalized treatment is delivered in the tempering furnace that temperature is 380-420 DEG C and dropped naturally
Warm 0.5-1.5h, continue heating afterwards and carry out high tempering processing；
（5）Vacuum hardening：Aluminium alloy castings after temper is delivered in vacuum quencher, is first warming up to 480~520
DEG C, after being incubated 60-80min, then hardening heat is warming up to as 580~620 DEG C, come out of the stove after insulation 2-3h air-cooled to room temperature；
（6）Annealing：Aluminium alloy castings is delivered in Muffle furnace, temperature is risen to 420 with 10-20 DEG C/min heating rate~
460 DEG C, after being incubated 2-3h, then 540~580 DEG C of annealing temperature is warming up to 15-25 DEG C/min heating rate, is incubated 1-3h,
Finally room temperature is air-cooled to stove.
Further, in step（1）In, the preheating temperature of the high-temperature vacuum furnace is 240-320 DEG C, pre-heating temperature elevation speed
For 10-20 DEG C/min.
Further, the aluminium alloy castings includes following composition by weight percentage：C 0.60-1.00%, Fe
3.60-4.40%, Si 1.80-2.20%, Mn 3.95-4.25%, Cu 2.50-2.70%, Mg 2.00-2.20%, Zn 3.15-
3.65%, Ni 0.36-0.48%, Ti 0.32-0.38%, Sb 0.15-0.25%, surplus are Al and not removable trace element.
Further, the aluminium alloy castings includes following composition by weight percentage：C 0.80%, Fe 4.00%,
Si 2.00%, Mn 4.15%, Cu 2.60%, Mg 2.10%, Zn 3.40%, Ni 0.42%, Ti 0.35%, Sb 0.20%, surplus
For Al and not removable trace element.
Further, not removable trace element≤0.01%.
Further, in step（2）In, the temperature of a normalized treatment is 640-680 DEG C, soaking time 1.5-
2.5h。
Further, in step（3）In, the temperature of the secondary normalizing processing is 680-720 DEG C, soaking time 1-
2h。
As a kind of prioritization scheme of the present invention, in step（4）In, the temperature of the high tempering is 600~700 DEG C,
Temperature is adjusted to 120-160 DEG C with 10-20 DEG C/min rate of temperature fall after insulation 1.5-2.5h, 40- is incubated in tempering furnace
60min。
The present invention has following beneficial effect：The aluminium alloy castings Technology for Heating Processing of the present invention is by rationally controlling aluminium to close
Golden casting chemical element content so that the mechanical strength of finished product cast improves, and next has properly increased adding in heat treatment process
Hot temperature and extension soaking time, so as to make the tissue of casting produce fully transformation, effectively improve mechanical performance and punching
Toughness is hit, the last strict control type of cooling and method, ensure that the enough quenching degree of alloy and the complete transformation of tissue, and enter
The every mechanical performance test of row, especially impact test, it is qualified that all technical reaches 100%；In addition, the Technology for Heating Processing
Step is simple and easy, and technological parameter is reasonable, easy to spread and use.The Technology for Heating Processing of the present invention is using homogenization preheating+two
The technological process of secondary normalizing+high tempering+vacuum hardening+annealing, compared with traditional Technology for Heating Processing, its advantage is further
Refinement and even grained, grain size is farthest improved, and prepare good organization condition for the heat treatment of postorder.
Embodiment
The embodiment of the present invention is further described with reference to embodiment, following examples are only used for more
Clearly demonstrate technical scheme, and can not be limited the scope of the invention with this.
Embodiment 1
A kind of Technology for Heating Processing of aluminium alloy castings, is followed the steps below：
（1）Vacuum homogenizes the pre-heat treatment：Aluminium alloy castings after casting is placed in high-temperature vacuum furnace and homogenizes preheating
2.5h is handled, preheating temperature is controlled at 240 DEG C, and pre-heating temperature elevation speed is set as 10 DEG C/min；
Above-mentioned aluminium alloy castings includes following composition by weight percentage：C 0.48%, Fe 3.20%, Si 1.45%, Mn
3.35%, Cu 2.10%, Mg 1.70%, Zn 2.70%, Ni 0.24%, Ti 0.28%, Sb 0.15%, surplus Al, wherein can not
Micronutrient levels≤0.01% of removal；
（2）Normalizing；Aluminium alloy castings after the pre-heat treatment is delivered to normalizing furnace and carries out a normalized treatment, above-mentioned normalizing
The heating rate of stove is 15 DEG C/min, and the temperature control of a normalized treatment, at 640 DEG C, soaking time is set as 1.5h；
（3）Secondary normalizing；Aluminium alloy castings after normalizing is delivered to normalizing furnace and carries out secondary normalizing processing, above-mentioned normalizing
The heating rate of stove is 20 DEG C/min, and the temperature of secondary normalizing processing is 680 DEG C, soaking time 1h；
（4）High tempering：Aluminium alloy castings after normalized treatment is delivered to Temperature fall in the tempering furnace that temperature is 380 DEG C
0.5h, continue to be heated to 600 DEG C of progress high tempering processing afterwards, be incubated temperature after 1.5h with 10 DEG C/min rate of temperature fall
120 DEG C are adjusted to, 40min is incubated in tempering furnace；
（5）Vacuum hardening：Aluminium alloy castings after temper is delivered in vacuum quencher, is first warming up to 480 DEG C, insulation
After 60min, then hardening heat is warming up to as 580 DEG C, come out of the stove after insulation 2h air-cooled to room temperature；
（6）Annealing：Aluminium alloy castings is delivered in Muffle furnace, temperature is risen to 420 DEG C with 10 DEG C/min heating rate, protected
After warm 2h, then 540 DEG C of annealing temperature is warming up to 15 DEG C/min heating rate, is incubated 1h, is finally air-cooled to room temperature i.e. with stove
Can.
Embodiment 2
A kind of Technology for Heating Processing of aluminium alloy castings, is followed the steps below：
（1）Vacuum homogenizes the pre-heat treatment：Aluminium alloy castings after casting is placed in high-temperature vacuum furnace and homogenizes preheating
3h is handled, preheating temperature is controlled at 260 DEG C, and pre-heating temperature elevation speed is set as 15 DEG C/min；
Above-mentioned aluminium alloy castings includes following composition by weight percentage：C 0.60%, Fe 3.60%, Si 1.80%, Mn
3.95%, Cu 2.50%, Mg 2.00%, Zn 3.15%, Ni 0.36%, Ti 0.32%, Sb 0.15%, surplus Al, wherein can not
Micronutrient levels≤0.01% of removal；
（2）Normalizing；Aluminium alloy castings after the pre-heat treatment is delivered to normalizing furnace and carries out a normalized treatment, above-mentioned normalizing
The heating rate of stove is 20 DEG C/min, and the temperature control of a normalized treatment, at 650 DEG C, soaking time is set as 1.5h；
（3）Secondary normalizing；Aluminium alloy castings after normalizing is delivered to normalizing furnace and carries out secondary normalizing processing, above-mentioned normalizing
The heating rate of stove is 20 DEG C/min, and the temperature of secondary normalizing processing is 690 DEG C, soaking time 1h；
（4）High tempering：Aluminium alloy castings after normalized treatment is delivered to Temperature fall in the tempering furnace that temperature is 390 DEG C
0.8h, continue to be heated to 620 DEG C of progress high tempering processing afterwards, be incubated temperature after 1.8h with 10 DEG C/min rate of temperature fall
130 DEG C are adjusted to, 45min is incubated in tempering furnace；
（5）Vacuum hardening：Aluminium alloy castings after temper is delivered in vacuum quencher, is first warming up to 490 DEG C, insulation
After 65min, then hardening heat is warming up to as 590 DEG C, come out of the stove after insulation 2h air-cooled to room temperature；
（6）Annealing：Aluminium alloy castings is delivered in Muffle furnace, temperature is risen to 430 DEG C with 10 DEG C/min heating rate, protected
After warm 2h, then 550 DEG C of annealing temperature is warming up to 15 DEG C/min heating rate, is incubated 1.5h, is finally air-cooled to room temperature with stove
.
Embodiment 3
A kind of Technology for Heating Processing of aluminium alloy castings, is followed the steps below：
（1）Vacuum homogenizes the pre-heat treatment：Aluminium alloy castings after casting is placed in high-temperature vacuum furnace and homogenizes preheating
3.5h is handled, preheating temperature is controlled at 280 DEG C, and pre-heating temperature elevation speed is set as 15 DEG C/min；
Above-mentioned aluminium alloy castings includes following composition by weight percentage：C 0.80%, Fe 4.00%, Si 2.00%, Mn
4.15%, Cu 2.60%, Mg 2.10%, Zn 3.40%, Ni 0.42%, Ti 0.35%, Sb 0.20%, surplus Al, wherein can not
Micronutrient levels≤0.01% of removal；
（2）Normalizing；Aluminium alloy castings after the pre-heat treatment is delivered to normalizing furnace and carries out a normalized treatment, above-mentioned normalizing
The heating rate of stove is 20 DEG C/min, and the temperature control of a normalized treatment, at 660 DEG C, soaking time is set as 2h；
（3）Secondary normalizing；Aluminium alloy castings after normalizing is delivered to normalizing furnace and carries out secondary normalizing processing, above-mentioned normalizing
The heating rate of stove is 25 DEG C/min, and the temperature of secondary normalizing processing is 700 DEG C, soaking time 1.5h；
（4）High tempering：Aluminium alloy castings after normalized treatment is delivered to Temperature fall in the tempering furnace that temperature is 400 DEG C
1h, continue to be heated to 650 DEG C of progress high tempering processing afterwards, be adjusted to temperature with 15 DEG C/min rate of temperature fall after being incubated 2h
140 DEG C, 50min is incubated in tempering furnace；
（5）Vacuum hardening：Aluminium alloy castings after temper is delivered in vacuum quencher, is first warming up to 500 DEG C, insulation
After 70min, then hardening heat is warming up to as 600 DEG C, come out of the stove after insulation 2.5h air-cooled to room temperature；
（6）Annealing：Aluminium alloy castings is delivered in Muffle furnace, temperature is risen to 440 DEG C with 15 DEG C/min heating rate, protected
After warm 2.5h, then 560 DEG C of annealing temperature is warming up to 20 DEG C/min heating rate, is incubated 2h, is finally air-cooled to room temperature with stove
.
Embodiment 4
A kind of Technology for Heating Processing of aluminium alloy castings, is followed the steps below：
（1）Vacuum homogenizes the pre-heat treatment：Aluminium alloy castings after casting is placed in high-temperature vacuum furnace and homogenizes preheating
4h is handled, preheating temperature is controlled at 300 DEG C, and pre-heating temperature elevation speed is set as 20 DEG C/min；
Above-mentioned aluminium alloy castings includes following composition by weight percentage：C 1.00%, Fe 4.40%, Si 2.20%, Mn
4.25%, Cu 2.70%, Mg 2.20%, Zn 3.65%, Ni 0.48%, Ti 0.38%, Sb 0.25%, surplus Al, wherein can not
Micronutrient levels≤0.01% of removal；
（2）Normalizing；Aluminium alloy castings after the pre-heat treatment is delivered to normalizing furnace and carries out a normalized treatment, above-mentioned normalizing
The heating rate of stove is 25 DEG C/min, and the temperature control of a normalized treatment, at 670 DEG C, soaking time is set as 2.5h；
（3）Secondary normalizing；Aluminium alloy castings after normalizing is delivered to normalizing furnace and carries out secondary normalizing processing, above-mentioned normalizing
The heating rate of stove is 30 DEG C/min, and the temperature of secondary normalizing processing is 710 DEG C, soaking time 2h；
（4）High tempering：Aluminium alloy castings after normalized treatment is delivered to Temperature fall in the tempering furnace that temperature is 410 DEG C
1.5h, continue to be heated to 680 DEG C of progress high tempering processing afterwards, be incubated temperature after 2.5h with 20 DEG C/min rate of temperature fall
150 DEG C are adjusted to, 55min is incubated in tempering furnace；
（5）Vacuum hardening：Aluminium alloy castings after temper is delivered in vacuum quencher, is first warming up to 510 DEG C, insulation
After 75min, then hardening heat is warming up to as 610 DEG C, come out of the stove after insulation 3h air-cooled to room temperature；
（6）Annealing：Aluminium alloy castings is delivered in Muffle furnace, temperature is risen to 450 DEG C with 20 DEG C/min heating rate, protected
After warm 3h, then 570 DEG C of annealing temperature is warming up to 25 DEG C/min heating rate, is incubated 3h, is finally air-cooled to room temperature i.e. with stove
Can.
Embodiment 5
A kind of Technology for Heating Processing of aluminium alloy castings, is followed the steps below：
（1）Vacuum homogenizes the pre-heat treatment：Aluminium alloy castings after casting is placed in high-temperature vacuum furnace and homogenizes preheating
4h is handled, preheating temperature is controlled at 320 DEG C, and pre-heating temperature elevation speed is set as 20 DEG C/min；
Above-mentioned aluminium alloy castings includes following composition by weight percentage：C 1.20%, Fe 4.80%, Si 2.65%, Mn
5.05%, Cu 3.20%, Mg 2.50%, Zn 4.30%, Ni 0.60%, Ti 0.44%, Sb 0.30%, surplus Al, wherein can not
Micronutrient levels≤0.01% of removal；
（2）Normalizing；Aluminium alloy castings after the pre-heat treatment is delivered to normalizing furnace and carries out a normalized treatment, above-mentioned normalizing
The heating rate of stove is 25 DEG C/min, and the temperature control of a normalized treatment, at 680 DEG C, soaking time is set as 2.5h；
（3）Secondary normalizing；Aluminium alloy castings after normalizing is delivered to normalizing furnace and carries out secondary normalizing processing, above-mentioned normalizing
The heating rate of stove is 30 DEG C/min, and the temperature of secondary normalizing processing is 720 DEG C, soaking time 2h；
（4）High tempering：Aluminium alloy castings after normalized treatment is delivered to Temperature fall in the tempering furnace that temperature is 420 DEG C
1.5h, continue to be heated to 700 DEG C of progress high tempering processing afterwards, be incubated temperature after 2.5h with 20 DEG C/min rate of temperature fall
160 DEG C are adjusted to, 60min is incubated in tempering furnace；
（5）Vacuum hardening：Aluminium alloy castings after temper is delivered in vacuum quencher, is first warming up to 520 DEG C, insulation
After 80min, then hardening heat is warming up to as 620 DEG C, come out of the stove after insulation 3h air-cooled to room temperature；
（6）Annealing：Aluminium alloy castings is delivered in Muffle furnace, temperature is risen to 460 DEG C with 20 DEG C/min heating rate, protected
After warm 3h, then 580 DEG C of annealing temperature is warming up to 25 DEG C/min heating rate, is incubated 3h, is finally air-cooled to room temperature i.e. with stove
Can.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention is described in detail, for those skilled in the art, it still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic.All essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (8)
1. a kind of Technology for Heating Processing of aluminium alloy castings, it is characterised in that comprise the following steps：
（1）Vacuum homogenizes the pre-heat treatment：Aluminium alloy castings after casting is placed in high-temperature vacuum furnace and homogenizes preheating
Handle 2.5-4h；
The aluminium alloy castings includes following composition by weight percentage：C 0.48-1.20%, Fe 3.20-4.80%, Si
1.45-2.65%, Mn 3.35-5.05%, Cu 2.10-3.20%, Mg 1.70-2.50%, Zn 2.70-4.30%, Ni 0.24-
0.60%, Ti 0.28-0.44%, Sb 0.15-0.30%, surplus are Al and not removable trace element；
Normalizing；Aluminium alloy castings after the pre-heat treatment is delivered to normalizing furnace and carries out a normalized treatment, the normalizing furnace
Heating rate be 15-25 DEG C/min；
Secondary normalizing；Aluminium alloy castings after normalizing is delivered to normalizing furnace and carries out secondary normalizing processing, the normalizing furnace
Heating rate be 20-30 DEG C/min；
（4）High tempering：Aluminium alloy castings after normalized treatment is delivered in the tempering furnace that temperature is 380-420 DEG C and dropped naturally
Warm 0.5-1.5h, continue heating afterwards and carry out high tempering processing；
（5）Vacuum hardening：Aluminium alloy castings after temper is delivered in vacuum quencher, is first warming up to 480~520
DEG C, after being incubated 60-80min, then hardening heat is warming up to as 580~620 DEG C, come out of the stove after insulation 2-3h air-cooled to room temperature；
（6）Annealing：Aluminium alloy castings is delivered in Muffle furnace, temperature is risen to 420 with 10-20 DEG C/min heating rate~
460 DEG C, after being incubated 2-3h, then 540~580 DEG C of annealing temperature is warming up to 15-25 DEG C/min heating rate, is incubated 1-3h,
Finally room temperature is air-cooled to stove.
2. the Technology for Heating Processing of a kind of aluminium alloy castings according to claim 1, it is characterised in that in step（1）In, institute
The preheating temperature for stating high-temperature vacuum furnace is 240-320 DEG C, and pre-heating temperature elevation speed is 10-20 DEG C/min.
A kind of 3. Technology for Heating Processing of aluminium alloy castings according to claim 1, it is characterised in that the aluminium alloy castings
Including following composition by weight percentage：C 0.60-1.00%, Fe 3.60-4.40%, Si 1.80-2.20%, Mn 3.95-
4.25%, Cu 2.50-2.70%, Mg 2.00-2.20%, Zn 3.15-3.65%, Ni 0.36-0.48%, Ti 0.32-0.38%,
Sb 0.15-0.25%, surplus are Al and not removable trace element.
A kind of 4. Technology for Heating Processing of aluminium alloy castings according to claim 3, it is characterised in that the aluminium alloy castings
Including following composition by weight percentage：C 0.80%, Fe 4.00%, Si 2.00%, Mn 4.15%, Cu 2.60%, Mg
2.10%, Zn 3.40%, Ni 0.42%, Ti 0.35%, Sb 0.20%, surplus are Al and not removable trace element.
5. the Technology for Heating Processing of a kind of aluminium alloy castings according to claim 1, it is characterised in that described not removable
Trace element≤0.01%.
6. the Technology for Heating Processing of a kind of aluminium alloy castings according to claim 1, it is characterised in that in step（2）In, institute
The temperature for stating a normalized treatment is 640-680 DEG C, soaking time 1.5-2.5h.
7. the Technology for Heating Processing of a kind of aluminium alloy castings according to claim 1, it is characterised in that in step（3）In, institute
The temperature for stating secondary normalizing processing is 680-720 DEG C, soaking time 1-2h.
8. the Technology for Heating Processing of a kind of aluminium alloy castings according to claim 1, it is characterised in that in step（4）In, institute
The temperature for stating high tempering is 600~700 DEG C, is adjusted to temperature with 10-20 DEG C/min rate of temperature fall after being incubated 1.5-2.5h
120-160 DEG C, 40-60min is incubated in tempering furnace.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710924510.1A CN107620017A (en) | 2017-09-30 | 2017-09-30 | A kind of Technology for Heating Processing of aluminium alloy castings |
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| CN201710924510.1A CN107620017A (en) | 2017-09-30 | 2017-09-30 | A kind of Technology for Heating Processing of aluminium alloy castings |
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Family
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| CN110760641A (en) * | 2019-11-15 | 2020-02-07 | 和县华顺铸造有限公司 | Casting method for preparing corner fitting by recycling scrap iron |
| WO2021056806A1 (en) * | 2019-09-23 | 2021-04-01 | 圆融金属粉末股份有限公司 | Aluminum alloy powder and manufacturing method therefor, and aluminum alloy product and manufacturing method therefor |
| CN113927013A (en) * | 2021-09-08 | 2022-01-14 | 慈溪市龙山汽配有限公司 | Forming method of U-shaped bracket for automobile |
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| CN103469017A (en) * | 2013-09-22 | 2013-12-25 | 苏州华宇精密铸造有限公司 | Aluminum alloy for precision casting and casting method thereof |
| CN105586514A (en) * | 2014-10-23 | 2016-05-18 | 无锡华冶钢铁有限公司 | Turbo machine blade machining technology with Al-Mn-Pb-Mg-Ti series high-strength aluminum alloy as material |
| CN105986206A (en) * | 2015-01-30 | 2016-10-05 | 重庆金亚模具制造有限公司 | Aluminum alloy castings heat treatment technology |
| CN107190130A (en) * | 2017-06-14 | 2017-09-22 | 合肥博创机械制造有限公司 | A kind of engine shroud Technology for Heating Processing |
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| CN103469017A (en) * | 2013-09-22 | 2013-12-25 | 苏州华宇精密铸造有限公司 | Aluminum alloy for precision casting and casting method thereof |
| CN105586514A (en) * | 2014-10-23 | 2016-05-18 | 无锡华冶钢铁有限公司 | Turbo machine blade machining technology with Al-Mn-Pb-Mg-Ti series high-strength aluminum alloy as material |
| CN105986206A (en) * | 2015-01-30 | 2016-10-05 | 重庆金亚模具制造有限公司 | Aluminum alloy castings heat treatment technology |
| CN107190130A (en) * | 2017-06-14 | 2017-09-22 | 合肥博创机械制造有限公司 | A kind of engine shroud Technology for Heating Processing |
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| WO2021056806A1 (en) * | 2019-09-23 | 2021-04-01 | 圆融金属粉末股份有限公司 | Aluminum alloy powder and manufacturing method therefor, and aluminum alloy product and manufacturing method therefor |
| CN110760641A (en) * | 2019-11-15 | 2020-02-07 | 和县华顺铸造有限公司 | Casting method for preparing corner fitting by recycling scrap iron |
| CN110760641B (en) * | 2019-11-15 | 2022-04-05 | 和县华顺铸造有限公司 | Casting method for preparing corner fitting by recycling scrap iron |
| CN113927013A (en) * | 2021-09-08 | 2022-01-14 | 慈溪市龙山汽配有限公司 | Forming method of U-shaped bracket for automobile |
| CN113927013B (en) * | 2021-09-08 | 2023-04-07 | 慈溪市龙山汽配有限公司 | Forming method of U-shaped bracket for automobile |
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Application publication date: 20180123 |