CN114074157B - Forging process of high-strength ZK60A magnesium alloy round bar - Google Patents
Forging process of high-strength ZK60A magnesium alloy round bar Download PDFInfo
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- CN114074157B CN114074157B CN202010814766.9A CN202010814766A CN114074157B CN 114074157 B CN114074157 B CN 114074157B CN 202010814766 A CN202010814766 A CN 202010814766A CN 114074157 B CN114074157 B CN 114074157B
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- forging
- magnesium alloy
- round bar
- zk60a
- hammer head
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- 238000005242 forging Methods 0.000 title claims abstract description 72
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 37
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 11
- 238000003825 pressing Methods 0.000 claims abstract description 8
- 238000000265 homogenisation Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 9
- 238000007670 refining Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 238000007514 turning Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 4
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 3
- 229910001093 Zr alloy Inorganic materials 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- QRNPTSGPQSOPQK-UHFFFAOYSA-N magnesium zirconium Chemical compound [Mg].[Zr] QRNPTSGPQSOPQK-UHFFFAOYSA-N 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 235000015842 Hesperis Nutrition 0.000 description 1
- 235000012633 Iberis amara Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- 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
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
A forging process of a high-strength ZK60A magnesium alloy round bar comprises the following steps: casting of round bars, homogenization heat treatment of the round bars, heat treatment of the round bars before forging and rolling, and forging and pressing; the invention has simple and easy process, can fully meet various performance indexes of ZK60A forging and rolling products, can improve the yield of the products to more than 96 percent, and reduces the cost of ZK60A magnesium alloy products.
Description
Technical Field
The invention relates to the technical field of magnesium alloy forging and rolling, in particular to a forging process of a high-strength ZK60A magnesium alloy round bar.
Background
The ZK60A magnesium alloy material not only has excellent organic matter resistance and corrosion resistance, but also has high specific strength, large specific elastic modulus, good heat dissipation, good compression resistance and anti-seismic performance, higher compression strength and yield strength and good formability and weldability, and can bear impact load capacity larger than that of aluminum alloy. At present, the material is commonly used for manufacturing robots, unmanned aerial vehicles, aircraft skins, cabin doors, rocker arms of operating systems, supports, spacecraft, rockets, missile structural members and the like. However, in actual production, if the alloy is directly rolled by a hot rolling mill, the yield is extremely low, and the outstanding performance of the alloy cannot reach the optimal state, so that the requirement of the current manufacturing field cannot be met, and the requirement of multi-field manufacturing can be met only by improving the density and strength of the ZK60A magnesium alloy through a forging and rolling process. The whole forging and rolling process comprises the steps of casting, turning and milling, flaw detection, heat treatment, re-turning and milling, bar preheating temperature, heat preservation time, forging and rolling temperature, forging and rolling speed, modification direction, specification and size of the round bar and the like of the ZK60A round bar, and the existing forging and rolling process of the magnesium alloy ZK60A round bar is lagged, has low forging and rolling yield and unstable performance, and is in urgent need of improvement.
For the above reasons, a forging process of a high-strength ZK60A magnesium alloy round bar has been developed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a forging process of a high-strength ZK60A magnesium alloy round bar, which is simple and easy, can fully meet various performance indexes of a ZK60A forging product, can improve the yield of the product to more than 96%, and reduces the cost of the ZK60A magnesium alloy product.
In order to achieve the above purpose, the invention adopts the following technical scheme: a forging process of a high-strength ZK60A magnesium alloy round bar comprises the following steps: casting of round bars, homogenization heat treatment of round bars, heat treatment of round bars before forging and rolling, and forging and pressing.
Firstly, casting a round bar: placing 1.48-1.52 tons of magnesium ingots with the magnesium content of 99.93-99.97% into a melting furnace crucible with the diameter of 1000 x being 160mm, adding 23-27kg of No. two solvents, heating and melting by adopting an electric furnace, adding 33-37kg of magnesium-zirconium alloy with the zirconium content of 28-32% when the temperature is raised to 730-770 ℃, stirring for 20 minutes by argon, cooling to 680-700 ℃, adding 78-82kg of zinc ingots with the zinc content of 97-99%, stirring for 10-20 minutes again, performing chemical component assay, adding 15-25kg of refining agent for refining for 15-25 minutes after the components are qualified, then standing for 35-45 minutes, starting a casting machine and a cooling water jacket, adding 15-25kg of No. five refining agent, and manufacturing a round ZK60A magnesium alloy rod with the diameter of 500 mm;
secondly, homogenizing heat treatment of the round bar: sawing a ZK60A magnesium alloy cast rod with the diameter of 500mm, wherein the sawing length is as follows: each section 890-910mm is milled to form a magnesium alloy round bar, and after digital ultrasonic flaw detection and defect removal, the magnesium alloy round bar is put into a resistance furnace for homogenization heat treatment, wherein the heat treatment time is 10-14 hours, and the specific steps are as follows: heating the furnace hearth to 280-320 ℃ within 280-320min, preserving heat for 100-140min, heating the furnace hearth to 350-410 ℃ within 40-80min, preserving heat for 220-260min, closing a power supply of the resistance furnace, naturally cooling for 280-320min, opening a furnace cover, naturally cooling to normal temperature, removing the round rod out of the furnace hearth, and processing the round rod in the next step;
thirdly, heat treatment of the round bar before forging: firstly, placing a magnesium alloy round bar in a natural gas heating furnace before forging and rolling, and carrying out temperature rise heat treatment for 20-24 hours, wherein the specific steps are as follows: heating the hearth to 300-400 ℃ within 340-380min and preserving heat, heating the hearth to 340-440 ℃ within 450-520min and preserving heat, heating the hearth to 360-460 ℃ within 450-530min and preserving heat, and discharging to forge and roll;
fourth, forging and pressing: heating the forging pad to 240-280 ℃, moving a magnesium alloy round bar which is kept at 400-420 ℃ to the upper part of the forging pad through a mechanical pliers, vertically placing the magnesium alloy round bar at a position corresponding to a hammer head of a forging mill, wherein the forging mill is 3000 tons, the hammer head of the forging mill is rectangular, then descending the hammer head of the forging mill at a speed of 130-180mm/min, quickly lifting the magnesium alloy round bar every time the hammer head is forged, placing the magnesium alloy round bar in a side-turning manner through the mechanical pliers, descending the hammer head at a speed of 100-140mm/min after the magnesium alloy round bar is placed in a stable manner, forging the magnesium alloy round bar into a hexagonal shape, and so on, wherein the temperature of the magnesium alloy round bar cannot be lower than 360-390 ℃ in the forging process, otherwise, the magnesium alloy round bar needs to be forged by reheating;
and (3) vertically and stably placing the forged hexagonal magnesium alloy ingot above the forging pad by using a mechanical pliers, aligning the forging pad with the position of the hammer head, keeping the temperature of the magnesium alloy ingot above 360 ℃, forging the hexagonal magnesium alloy with the hammer head at the speed of 140-180mm/min, and continuously adjusting the position of the magnesium alloy ingot by using the mechanical pliers until the magnesium alloy ingot is forged into the required magnesium alloy forging specification.
The beneficial effects of the invention are as follows: the process is simple and feasible, can fully meet various performance indexes of the ZK60A forging and rolling product, can improve the yield of the product to more than 96%, and reduces the cost of the ZK60A magnesium alloy product.
Detailed Description
The invention is further described in detail below with reference to examples and embodiments:
example 1
Putting 1500kg of magnesium ingots with 99.95% of magnesium content into a melting furnace crucible, adding 25kg of second solvent, heating and melting by adopting an electric heating furnace, adding 35kg of magnesium-zirconium alloy with 30% of zirconium content when the temperature is raised to 750 ℃, stirring for 20 minutes by argon, cooling to 700 ℃, adding 80kg of zinc ingots with 99% of zinc content, stirring for 15 minutes again, performing chemical component assay, adding 20kg of refining agent for refining for 20 minutes after the components are qualified, then standing for 40 minutes, starting a casting machine and a cooling water jacket, adding 20kg of fifth refining agent, and manufacturing a ZK60A magnesium alloy casting rod with the diameter of 500 mm;
secondly, homogenizing heat treatment of the round bar: sawing a ZK60A magnesium alloy cast rod with the diameter of 500mm, wherein the sawing length is as follows: 900mm, milling to form a magnesium alloy round bar with phi 420 mm and 900mm, carrying out digital ultrasonic flaw detection to remove defects, and then placing the magnesium alloy round bar into a resistance furnace for homogenizing heat treatment, wherein the heat treatment time is 12 hours, and the specific steps are as follows: raising the temperature of the hearth to 300 ℃ within 300min, preserving heat for 120min, raising the temperature of the hearth to 380 ℃ within 60min, preserving heat for 120min, closing a power supply of the resistance furnace, naturally cooling for 300min, opening a furnace cover, naturally cooling to normal temperature, removing the round rod out of the hearth, and processing the round rod in the next step;
thirdly, heat treatment of the round bar before forging: before forging, firstly placing the magnesium alloy round bar in a natural gas heating furnace, and carrying out heating treatment for 22 hours, wherein the specific steps are as follows: heating the hearth to 350 ℃ and preserving heat in 360min, heating the hearth to 390 ℃ and preserving heat in 480min, heating the hearth to 410 ℃ and preserving heat in 480min, and discharging the hearth for forging;
fourth, forging and pressing: heating the forging pad to 260 ℃, moving a magnesium alloy round bar with the temperature of 410 ℃ to the upper part of the forging pad through a mechanical pliers, vertically placing the magnesium alloy round bar at a position corresponding to a hammer head of a forging mill, wherein the forging mill is 3000 tons, the hammer head of the forging mill is rectangular, then descending the hammer head of the forging mill at a speed of 150mm/min, pressing down the magnesium alloy round bar, quickly lifting the hammer head every time the forging is finished, laterally turning over the magnesium alloy round bar by the mechanical pliers, placing stably, descending the hammer head at a speed of 120mm/min, forging the magnesium alloy round bar, and so on, forging the magnesium alloy round bar into a hexagonal prism, wherein the temperature of the magnesium alloy round bar cannot be lower than 380 ℃ in the forging process, and otherwise, the magnesium alloy round bar needs to be heated again for forging;
and (3) vertically and stably placing the forged hexagonal magnesium alloy ingot above the forging pad by using a mechanical pliers, aligning the forging pad with the position of the hammer head, keeping the temperature of the magnesium alloy ingot above 370 ℃, forging the hexagonal magnesium alloy with the hammer head at the speed of 160mm/min, and continuously adjusting the position of the magnesium alloy ingot by using the mechanical pliers until the magnesium alloy ingot is forged into the required magnesium alloy forging specification.
Claims (1)
1. A forging process of a high-strength ZK60A magnesium alloy round bar is characterized by comprising the following steps of: the process flow comprises the following steps: casting of round bars, homogenization heat treatment of the round bars, heat treatment of the round bars before forging and rolling, and forging and pressing;
casting the round bar: placing 1.48-1.52 tons of magnesium ingots with the magnesium content of 99.93-99.97% into a melting furnace crucible with the diameter of 1000 x being 160mm, adding 23-27kg of No. two solvents, heating and melting by adopting an electric heating furnace, adding 33-37kg of magnesium-zirconium alloy with the zirconium content of 28-32% when the temperature is raised to 730-770 ℃, stirring for 20 minutes by argon, cooling to 680-700 ℃, adding 78-82kg of zinc ingots with the zinc content of 97-99%, stirring for 10-20 minutes again, performing chemical component assay, adding 15-25kg of refining agent for refining for 15-25 minutes after the components are qualified, then standing for 35-45 minutes, starting a casting machine and a cooling water jacket, adding 15-25kg of No. five refining agent, and manufacturing a ZK60A magnesium alloy casting rod with the diameter of 500 mm;
homogenizing heat treatment of the round bar: sawing a ZK60A magnesium alloy cast rod with the diameter of 500mm, wherein the sawing length is as follows: each section 890-910mm, milling to form a magnesium alloy round bar, and placing the magnesium alloy round bar into a resistance furnace for homogenizing heat treatment after digital ultrasonic flaw detection without defects, wherein the specific steps are as follows: heating the furnace hearth to 280-320 ℃ within 280-320min, preserving heat for 100-140min, heating the furnace hearth to 350-410 ℃ within 40-80min, preserving heat for 220-260min, closing a power supply of the resistance furnace, naturally cooling for 280-320min, opening a furnace cover, naturally cooling to normal temperature, removing the round rod out of the furnace hearth, and processing the round rod in the next step;
the forging and pressing working procedure comprises the following steps: heating the forging pad to 240-280 ℃, moving a magnesium alloy round bar which is kept at 400-420 ℃ to the position above the forging pad through a mechanical pliers, vertically placing the magnesium alloy round bar at the position corresponding to a hammer head of a forging mill, wherein the forging mill is 3000 tons, the hammer head of the forging mill is rectangular, then descending the hammer head of the forging mill at the speed of 130-180mm/min, pressing down the magnesium alloy round bar, quickly lifting the hammer head every time the forging is completed, placing the magnesium alloy round bar in a side-turning manner through the mechanical pliers, descending the hammer head at the speed of 100-140mm/min after the placing is stable, forging the magnesium alloy round bar, and so on, and forging the magnesium alloy round bar into a hexagonal shape;
and (3) vertically and stably placing the forged hexagonal magnesium alloy ingot above the forging pad by using a mechanical pliers, aligning the forging pad with the position of the hammer head, keeping the temperature of the hexagonal magnesium alloy ingot above 360 ℃, forging the hexagonal magnesium alloy ingot by using the hammer head at the speed of 140-180mm/min, and continuously adjusting the position of the hexagonal magnesium alloy ingot by using the mechanical pliers until the hexagonal magnesium alloy ingot is forged into the required magnesium alloy forging specification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010814766.9A CN114074157B (en) | 2020-08-13 | 2020-08-13 | Forging process of high-strength ZK60A magnesium alloy round bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010814766.9A CN114074157B (en) | 2020-08-13 | 2020-08-13 | Forging process of high-strength ZK60A magnesium alloy round bar |
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| Publication Number | Publication Date |
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| CN114074157A CN114074157A (en) | 2022-02-22 |
| CN114074157B true CN114074157B (en) | 2024-02-02 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581058A (en) * | 2012-02-27 | 2012-07-18 | 江苏诚德钢管股份有限公司 | Production method for forging magnesium alloy plate under conditions of temperature reduction and large pressing quantity |
| CN104313522A (en) * | 2014-09-28 | 2015-01-28 | 洛阳镁鑫合金制品有限公司 | Homogenization treatment process of ZK61M magnesium alloy slab ingots |
| CN104384409A (en) * | 2014-09-28 | 2015-03-04 | 洛阳镁鑫合金制品有限公司 | Process for heating ZK61M magnesium alloy slab ingot before forge rolling |
| CN104384411A (en) * | 2014-09-28 | 2015-03-04 | 洛阳镁鑫合金制品有限公司 | Magnesium alloy slab ingot forging and rolling process |
| CN104438996A (en) * | 2014-09-28 | 2015-03-25 | 洛阳镁鑫合金制品有限公司 | ZK61M magnesium alloy slab ingot forging and rolling process |
| CN104438995A (en) * | 2014-09-28 | 2015-03-25 | 洛阳镁鑫合金制品有限公司 | Process for forging and rolling ZK61M magnesium alloy slab ingot |
| CA2955324A1 (en) * | 2016-01-28 | 2017-07-28 | Daido Steel Co., Ltd. | Method for manufacturing alloy ingot |
| EP3650567A1 (en) * | 2018-11-08 | 2020-05-13 | Citic Dicastal Co., Ltd. | High-strength and high-toughness magnesium alloy and preparation method thereof |
-
2020
- 2020-08-13 CN CN202010814766.9A patent/CN114074157B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102581058A (en) * | 2012-02-27 | 2012-07-18 | 江苏诚德钢管股份有限公司 | Production method for forging magnesium alloy plate under conditions of temperature reduction and large pressing quantity |
| CN104313522A (en) * | 2014-09-28 | 2015-01-28 | 洛阳镁鑫合金制品有限公司 | Homogenization treatment process of ZK61M magnesium alloy slab ingots |
| CN104384409A (en) * | 2014-09-28 | 2015-03-04 | 洛阳镁鑫合金制品有限公司 | Process for heating ZK61M magnesium alloy slab ingot before forge rolling |
| CN104384411A (en) * | 2014-09-28 | 2015-03-04 | 洛阳镁鑫合金制品有限公司 | Magnesium alloy slab ingot forging and rolling process |
| CN104438996A (en) * | 2014-09-28 | 2015-03-25 | 洛阳镁鑫合金制品有限公司 | ZK61M magnesium alloy slab ingot forging and rolling process |
| CN104438995A (en) * | 2014-09-28 | 2015-03-25 | 洛阳镁鑫合金制品有限公司 | Process for forging and rolling ZK61M magnesium alloy slab ingot |
| CA2955324A1 (en) * | 2016-01-28 | 2017-07-28 | Daido Steel Co., Ltd. | Method for manufacturing alloy ingot |
| EP3650567A1 (en) * | 2018-11-08 | 2020-05-13 | Citic Dicastal Co., Ltd. | High-strength and high-toughness magnesium alloy and preparation method thereof |
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| CN114074157A (en) | 2022-02-22 |
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