CN114700475A - Flexible die-casting process of thin-wall shell casting - Google Patents
Flexible die-casting process of thin-wall shell casting Download PDFInfo
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- CN114700475A CN114700475A CN202210253923.2A CN202210253923A CN114700475A CN 114700475 A CN114700475 A CN 114700475A CN 202210253923 A CN202210253923 A CN 202210253923A CN 114700475 A CN114700475 A CN 114700475A
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- 238000004512 die casting Methods 0.000 title claims abstract description 102
- 238000005266 casting Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000000265 homogenisation Methods 0.000 claims abstract description 18
- 238000004381 surface treatment Methods 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims description 19
- 230000032683 aging Effects 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000005868 electrolysis reaction Methods 0.000 claims description 10
- 239000001307 helium Substances 0.000 claims description 10
- 229910052734 helium Inorganic materials 0.000 claims description 10
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 3
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
Abstract
The invention discloses a flexible die-casting process of a thin-wall shell casting, which relates to the technical field of die-casting, and specifically comprises the following steps: s01: treating raw materials; s02: processing a mould; s03: die casting; s04: homogenizing; s05: cooling; s06: and (6) surface treatment. The process flow is simple to operate, the cost is low, the difficulty is low, the die casting process is suitable for die casting of the thin-wall shell, the thin-wall shell casting prepared by the flexible die casting process is uniform in wall thickness, not prone to cracking and high in yield, stress concentration in the crystallization process is reduced through two-stage homogenization heat treatment, the crystal structure of the casting is improved, the density and the mechanical property of the die casting are improved, the requirement on the skill of workers is low, the die casting process is suitable for large-scale production, and the problems that the existing die casting process flow is complex to operate, high in difficulty and high in cost, the prepared die casting is poor in density and mechanical property, the phenomena of insufficient pouring, cracking and the like are prone to occurring, and the yield is low are solved.
Description
Technical Field
The invention relates to the technical field of die casting, in particular to a flexible die casting process of a thin-wall shell casting.
Background
Die casting is a metal casting process, is a precise casting method for forcibly pressing molten metal into a metal mold with a complex shape by using high pressure, and is widely applied to various industries.
In the prior art, a thin-wall casting is high in research and development cost, long in period, high in operation difficulty and high in requirement on the skill level of field workers in the molding process, and meanwhile, due to the fact that the wall thickness is thin, the size of the product is difficult to control, the size error is large, and the qualified rate of the finished product is low.
The defects of the prior art are as follows: the flexible die casting process flow of the existing thin-wall shell casting is complex in operation, high in difficulty and high in cost, the density and the mechanical property of the prepared die casting are poor, and the phenomena of insufficient pouring, cold shut, cracking, uneven wall thickness and the like are prone to occurring when the thin-wall shell casting is cast, so that the quality of a finished product is affected. Accordingly, those skilled in the art have provided a flexible die casting process for thin wall shell castings that addresses the problems set forth in the background above.
Disclosure of Invention
The invention aims to provide a flexible die-casting process of a thin-wall shell casting, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a flexible die-casting process of a thin-wall shell casting specifically comprises the following steps:
s01: raw material treatment: putting the metal raw material into a crucible furnace, heating until the raw material is completely melted at the temperature of 790-820 ℃ to obtain a metal raw material melt;
s02: treating the die: preparing and cleaning a die-casting die, preheating the die-casting die, and spraying paint into the die after preheating;
s03: die casting: injecting the molten metal raw material into a die of a die casting machine through a flexible channel, and performing thin-wall die casting treatment to obtain a die casting;
s04: homogenizing: homogenizing the die casting;
s05: and (3) cooling: carrying out heat treatment on the die casting subjected to the homogenization treatment, then carrying out cooling treatment, and taking out the casting to obtain a thin-wall shell casting blank;
s06: surface treatment: and (3) putting the thin-wall shell casting blank into an electrolytic bath, performing surface pretreatment, and polishing the electrolyzed casting blank to obtain a thin-wall shell casting finished product.
As a further scheme of the invention: and refining the molten metal raw material in the S01 by rotationally blowing high-purity helium for 25-35 min.
As a still further scheme of the invention: the mass purity of the high-purity helium gas is 99%.
As a still further scheme of the invention: and preheating the die casting mold in the S02 at 200-210 ℃, and keeping the temperature for 12-18 min.
As a still further scheme of the invention: in the S03 medium-pressure casting process, the fast injection speed is 3-5 m/S, the slow injection speed is 0.4-0.6 m/S, the molten liquid with the molten state temperature of 760-800 ℃ is poured into a die-casting die under the condition that the fast injection point is 280-340 mm, the die-casting die is molded under the low pressure of 0.03-0.05 MPa, the pressure is maintained for 10-20S, and the die is stopped from being heated.
As a still further scheme of the invention: the homogenization treatment in S04 adopts two-stage homogenization treatment at 300 ℃/60h +320 ℃.
As a still further scheme of the invention: and the cooling mode in the S05 is an air cooling mode, and the casting is cooled to 60-90 ℃.
As a still further scheme of the invention: the heat treatment in the step S05 is to perform an aging treatment on the die casting.
As a still further scheme of the invention: the temperature of the aging treatment is 0.2-0.4 Tg, the time is 0.5-6 h, and the aging treatment is carried out in the environment of 0.2-0.3 MPa.
As a still further scheme of the invention: the electrolysis temperature in the S06 is 65-75 ℃, and the current is 5-10A/dm2The electrolysis time is 20-30 s.
Compared with the prior art, the invention has the beneficial effects that: the invention discloses a flexible die-casting process of a thin-wall shell casting, which has the advantages of simple process flow operation, lower cost and small difficulty, is suitable for die-casting of the thin-wall shell, and the thin-wall shell casting prepared by the flexible die-casting process has uniform wall thickness, difficult cracking and high yield, and reduces stress concentration in the crystallization process through two-stage homogenization heat treatment, improves the crystal structure of the casting, improves the density and the mechanical property of the die casting, the invention has lower requirement on the skill of workers and is suitable for large-scale production, solves the problems of complex operation, high difficulty and higher cost of the die casting process flow in the prior art, the prepared die casting has poor density and mechanical property, and the problems of poor casting, cold shut, cracking, uneven wall thickness and the like easily occur when casting a thin-wall shell casting, so that the quality of a finished product is influenced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, the first and second substrates,
example 1
A flexible die-casting process of a thin-wall shell casting specifically comprises the following steps:
s01: treating raw materials: putting the metal raw material into a crucible furnace, heating until the raw material is completely melted at the temperature of 790 ℃, and obtaining a metal raw material melt;
s02: treating the die: preparing and cleaning a die-casting die, preheating the die-casting die, and spraying coating to the interior of the die after preheating;
s03: die casting: injecting the molten metal raw material into a die of a die casting machine through a flexible channel, and performing thin-wall die casting treatment to obtain a die casting;
s04: homogenizing: homogenizing the die casting;
s05: and (3) cooling: carrying out heat treatment on the die casting subjected to the homogenization treatment, then carrying out cooling treatment, and taking out the casting to obtain a thin-wall shell casting blank;
s06: surface treatment: and (3) putting the thin-wall shell casting blank into an electrolytic bath, performing surface pretreatment, and polishing the electrolyzed casting blank to obtain a thin-wall shell casting finished product.
Further, the molten metal material in S01 was refined by blowing high-purity helium gas by rotation for 25 min.
Still further, the mass purity of the high-purity helium gas is 99%.
Further, in S02, the preheating temperature of the die casting mould is 200 ℃, and the temperature is kept for 12 min.
And further, in the process of pressure casting in the step S03, the fast injection speed is 3m/S, the slow injection speed is 0.4m/S, the molten liquid with the molten state temperature of 760 ℃ is poured into a die-casting die under the conditions that the fast injection point is 280mm, the die-casting die is molded under the low pressure of 0.03MPa, the pressure is maintained for 10S, and the die is stopped from being heated.
Still further, the homogenization treatment in S04 employs two-stage homogenization treatment at 300 ℃/60h +320 ℃.
And further, the cooling mode in the S05 is an air cooling mode, and the casting is cooled to 60 ℃.
Still further, the heat treatment in S05 is an aging treatment of the die cast article.
Still further, the temperature of the aging treatment is 0.2Tg, the time is 0.5h, and the aging treatment is carried out in the environment of 0.2 MPa.
Still further, the electrolysis temperature in S06 was 65 ℃ and the current was 5A/dm2The electrolysis time was 20 s.
Example 2
A flexible die-casting process of a thin-wall shell casting specifically comprises the following steps:
s01: raw material treatment: putting the metal raw material into a crucible furnace, and heating until the raw material is completely melted at 820 ℃ to obtain a metal raw material melt;
s02: treating the die: preparing and cleaning a die-casting die, preheating the die-casting die, and spraying paint into the die after preheating;
s03: die casting: injecting the molten metal raw material into a die of a die casting machine through a flexible channel, and performing thin-wall die casting treatment to obtain a die casting;
s04: homogenizing: homogenizing the die casting;
s05: and (3) cooling: carrying out heat treatment on the die casting subjected to the homogenization treatment, then carrying out cooling treatment, and taking out the casting to obtain a thin-wall shell casting blank;
s06: surface treatment: and (3) putting the thin-wall shell casting blank into an electrolytic bath, performing surface pretreatment, and polishing the electrolyzed casting blank to obtain a thin-wall shell casting finished product.
Further, the molten metal material in S01 was refined by blowing high-purity helium gas by rotation for 35 min.
Still further, the mass purity of the high-purity helium gas is 99%.
Further, in S02, the preheating temperature of the die casting mould is 210 ℃, and the temperature is kept for 18 min.
And further, in the process of pressure casting in S03, the fast injection speed is 5m/S, the slow injection speed is 0.6m/S, the melt with the melting state temperature of 800 ℃ is poured into a die-casting die under the conditions that the fast injection point is 340mm, the die-casting die is molded under the low pressure of 0.05MPa, the pressure is maintained for 20S, and the die is stopped from being heated.
Still further, the homogenization treatment in S04 employs two-stage homogenization treatment at 300 ℃/60h +320 ℃.
Further, the cooling in S05 is carried out by air cooling, and the casting is cooled to 90 ℃.
Still further, the heat treatment in S05 is an aging treatment of the die cast article.
Still further, the temperature of the aging treatment is 0.4Tg, the time is 6h, and the aging treatment is carried out in the environment of 0.3 MPa.
Still further, the electrolysis temperature in S06 was 75 ℃ and the current was 10A/dm2The electrolysis time was 30 s.
Example 3
A flexible die-casting process of a thin-wall shell casting specifically comprises the following steps:
s01: raw material treatment: putting the metal raw material into a crucible furnace, and heating until the raw material is completely melted at the temperature of 805 ℃ to obtain a metal raw material melt;
s02: treating the die: preparing and cleaning a die-casting die, preheating the die-casting die, and spraying paint into the die after preheating;
s03: die casting: injecting the molten metal raw material into a die of a die casting machine through a flexible channel, and performing thin-wall die casting treatment to obtain a die casting;
s04: homogenizing: homogenizing the die casting;
s05: and (3) cooling: carrying out heat treatment on the die casting subjected to the homogenization treatment, then carrying out cooling treatment, and taking out the casting to obtain a thin-wall shell casting blank;
s06: surface treatment: and (3) putting the thin-wall shell casting blank into an electrolytic bath, performing surface pretreatment, and polishing the electrolyzed casting blank to obtain a thin-wall shell casting finished product.
Further, the molten metal material in S01 is refined by blowing high purity helium gas in a rotating manner for 30 min.
Still further, the mass purity of the high-purity helium gas is 99%.
Further, in S02, the preheating temperature of the die casting mould is 205 ℃, and the temperature is kept for 15 min.
And further, in the S03 medium-pressure casting process, the fast injection speed is 4m/S, the slow injection speed is 0.5m/S, the fast injection point is 310mm, the melt with the molten state temperature of 780 ℃ is poured into a die-casting die, the die-casting die is formed under the low pressure of 0.04MPa, the pressure is maintained for 15S, and the die is stopped from being heated.
Still further, the homogenization treatment in S04 employs two-stage homogenization treatment at 300 ℃/60h +320 ℃.
Further, the cooling in S05 is carried out by air cooling, and the casting is cooled to 75 ℃.
Still further, the heat treatment in S05 is an aging treatment of the die cast article.
Still further, the temperature of the aging treatment is 0.3Tg, the time is 3h, and the aging treatment is carried out in the environment of 0.3 MPa.
Still further, the electrolysis temperature in S06 was 70 ℃ and the current was 7A/dm2The electrolysis time was 25 s.
The process flow is simple to operate, the cost is low, the difficulty is low, the die casting process is suitable for die casting of the thin-wall shell, the wall thickness of a thin-wall shell casting prepared by the flexible die casting process is uniform, the thin-wall shell casting is not prone to cracking, the yield is high, stress concentration in the crystallization process is reduced through two-stage homogenization heat treatment, the crystal structure of the casting is improved, the density and the mechanical property of the die casting are improved, the requirement on the skill of workers is low, and the die casting process is suitable for large-scale production.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A flexible die-casting process of a thin-wall shell casting is characterized in that: the die-casting process specifically comprises the following steps:
s01: raw material treatment: putting the metal raw material into a crucible furnace, heating until the raw material is completely melted at the temperature of 790-820 ℃ to obtain a metal raw material melt;
s02: treating the die: preparing and cleaning a die-casting die, preheating the die-casting die, and spraying paint into the die after preheating;
s03: die casting: injecting the molten metal raw material into a die of a die casting machine through a flexible channel, and performing thin-wall die casting treatment to obtain a die casting;
s04: homogenizing: homogenizing the die casting;
s05: and (3) cooling: carrying out heat treatment on the die casting subjected to the homogenization treatment, then carrying out cooling treatment, and taking out the casting to obtain a thin-wall shell casting blank;
s06: surface treatment: and (3) putting the thin-wall shell casting blank into an electrolytic bath, performing surface pretreatment, and polishing the electrolyzed casting blank to obtain a thin-wall shell casting finished product.
2. A flexible die casting process of a thin walled shell casting according to claim 1 wherein: and refining the molten metal raw material in the S01 by rotationally blowing high-purity helium for 25-35 min.
3. The flexible die casting process of a thin-walled shell casting of claim 2, wherein: the mass purity of the high-purity helium gas is 99%.
4. The flexible die casting process of a thin-walled shell casting of claim 1, wherein: and preheating the die casting mold in the S02 at 200-210 ℃, and keeping the temperature for 12-18 min.
5. The flexible die casting process of a thin-walled shell casting of claim 1, wherein: in the S03 medium-pressure casting process, the fast injection speed is 3-5 m/S, the slow injection speed is 0.4-0.6 m/S, the molten liquid with the molten state temperature of 760-800 ℃ is poured into a die-casting die under the condition that the fast injection point is 280-340 mm, the die-casting die is molded under the low pressure of 0.03-0.05 MPa, the pressure is maintained for 10-20S, and the die is stopped from being heated.
6. The flexible die casting process of a thin-walled shell casting of claim 1, wherein: the homogenization treatment in S04 adopts two-stage homogenization treatment at 300 ℃/60h +320 ℃.
7. The flexible die casting process of a thin-walled shell casting of claim 1, wherein: and the cooling mode in the S05 is an air cooling mode, and the casting is cooled to 60-90 ℃.
8. The flexible die casting process of a thin-walled shell casting of claim 1, wherein: the heat treatment in the step S05 is to perform an aging treatment on the die casting.
9. The flexible die casting process of a thin-walled shell casting of claim 8, wherein: the temperature of the aging treatment is 0.2-0.4 Tg, the time is 0.5-6 h, and the aging treatment is carried out under the environment of 0.2-0.3 MPa.
10. The flexible die casting process of a thin-walled shell casting of claim 1, wherein: the electrolysis temperature in the S06 is 65-75 ℃, and the current is 5-10A/dm2The electrolysis time is 20-30 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210253923.2A CN114700475A (en) | 2022-03-15 | 2022-03-15 | Flexible die-casting process of thin-wall shell casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210253923.2A CN114700475A (en) | 2022-03-15 | 2022-03-15 | Flexible die-casting process of thin-wall shell casting |
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| CN114700475A true CN114700475A (en) | 2022-07-05 |
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| CN202210253923.2A Withdrawn CN114700475A (en) | 2022-03-15 | 2022-03-15 | Flexible die-casting process of thin-wall shell casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117587217A (en) * | 2024-01-18 | 2024-02-23 | 安百拓(张家口)建筑矿山设备有限公司 | Drill rod heat treatment air cooling device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB505403A (en) * | 1937-05-27 | 1939-05-10 | Karl Friedrich Wagner | Improvements in or relating to the casting of easily oxidisable metals |
| CN101113504A (en) * | 2007-09-06 | 2008-01-30 | 北京有色金属研究总院 | Heat conductive magnesium alloy and method for preparing same |
| CN102861895A (en) * | 2011-07-07 | 2013-01-09 | 吴玉荣 | Ultra-large type thin-wall complex part die-casting process |
| CN104736271A (en) * | 2012-10-26 | 2015-06-24 | 株式会社Uacj | Al alloy cast impeller for compressor and process for producing same |
| CN104874766A (en) * | 2015-05-21 | 2015-09-02 | 凤冈县凤鸣农用机械制造有限公司 | Low-pressure casting method of thin-wall aluminum alloy part |
| CN112247105A (en) * | 2020-09-27 | 2021-01-22 | 浙江鑫泰阀门科技有限公司 | Process for die casting valve member |
-
2022
- 2022-03-15 CN CN202210253923.2A patent/CN114700475A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB505403A (en) * | 1937-05-27 | 1939-05-10 | Karl Friedrich Wagner | Improvements in or relating to the casting of easily oxidisable metals |
| CN101113504A (en) * | 2007-09-06 | 2008-01-30 | 北京有色金属研究总院 | Heat conductive magnesium alloy and method for preparing same |
| CN102861895A (en) * | 2011-07-07 | 2013-01-09 | 吴玉荣 | Ultra-large type thin-wall complex part die-casting process |
| CN104736271A (en) * | 2012-10-26 | 2015-06-24 | 株式会社Uacj | Al alloy cast impeller for compressor and process for producing same |
| CN104874766A (en) * | 2015-05-21 | 2015-09-02 | 凤冈县凤鸣农用机械制造有限公司 | Low-pressure casting method of thin-wall aluminum alloy part |
| CN112247105A (en) * | 2020-09-27 | 2021-01-22 | 浙江鑫泰阀门科技有限公司 | Process for die casting valve member |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117587217A (en) * | 2024-01-18 | 2024-02-23 | 安百拓(张家口)建筑矿山设备有限公司 | Drill rod heat treatment air cooling device and method |
| CN117587217B (en) * | 2024-01-18 | 2024-05-07 | 安百拓(张家口)建筑矿山设备有限公司 | Drill rod heat treatment air cooling device and method |
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Application publication date: 20220705 |