CN112359300A - Method for reducing quenching residual stress of die forging - Google Patents
Method for reducing quenching residual stress of die forging Download PDFInfo
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- CN112359300A CN112359300A CN202011060743.XA CN202011060743A CN112359300A CN 112359300 A CN112359300 A CN 112359300A CN 202011060743 A CN202011060743 A CN 202011060743A CN 112359300 A CN112359300 A CN 112359300A
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- 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
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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Abstract
The invention discloses a method for reducing quenching residual stress of a die forging, which relates to the technical field of aluminum alloy material processing, and specifically comprises S1, deep cooling treatment of the forging; s2, slow heating and S3, low-temperature remelting, and the method for reducing the quenching residual stress of the die forging comprises the steps that the forging rotates above liquid nitrogen to generate cyclone to accelerate the attraction of cold air to the surface of the forging, so that the cooling speed of the forging is accelerated, the original 1-3h deep cooling treatment time is shortened to 0.5-1.5 h, the cooled forging is placed in normal-temperature water to be slowly heated, the residual stress is slowly eliminated, meanwhile, the rapid thermal expansion and cold contraction of the forging are prevented from generating embrittlement, the forging can be heated by normal-temperature water through stirring, the time required for remelting the forging heated by the normal-temperature water is shortened, the time required for eliminating the residual stress is shortened, and the processing efficiency of the forging is improved.
Description
Technical Field
The invention relates to the technical field of aluminum alloy material processing, in particular to a method for reducing quenching residual stress of a die forging.
Background
The 7050 aluminum alloy has good comprehensive properties such as high strength, high toughness, corrosion resistance and the like, is a common metal material in the field of aviation, needs to be subjected to solid-liquid treatment at a high temperature of about 470 ℃, and is subjected to man-hour effective treatment after quenching so as to obtain excellent comprehensive properties, but in the quenching and cooling process, the difference between the surface of a forged piece and the internal temperature is large, so that the surface of the forged piece generates compressive stress, the internal of the forged piece generates tensile stress, and finally, the subsequent processing of the forged piece is easy to cause the deformation of parts and the service life of a finished part product is greatly shortened, so that the quenching residual stress of the forged piece needs to be eliminated, the existing quenching residual stress eliminating method of the forged piece generally adopts a cryogenic treatment method, and the principle is that the quenched forged piece is placed at the temperature of-120 ℃ for heat preservation for 1-3 hours so as to ensure that the core, and then taking out the forging to carry out furnace returning and heating for about 1h, and generating thermal stress in the opposite direction through the transformation of rapid cooling and rapid heating, thereby offsetting the residual stress of the forging.
The existing method for processing the forged piece deeply needs to change the forged piece from extreme cold to extreme heat, and the surface of the forged piece is easy to embrittle due to rapid expansion with heat and contraction with cold, so that the forged piece is easy to crack in the later processing process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for reducing the quenching residual stress of a die forging, and solves the problems that the existing deep cooling treatment method of the forging needs to rapidly change the forging from extreme cold to extreme heat, and the surface of the forging is easily embrittled due to rapid thermal expansion and cold contraction, so that the forging is easily cracked in the later processing process.
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for reducing the quenching residual stress of a die forging comprises the following operation processes:
s1, cryogenic treatment of the forged piece:
placing the quenched forging into a cooling liquid tank for cryogenic treatment;
s2, slow warming:
placing the forging subjected to cryogenic treatment into normal-temperature water, wherein the temperature of the normal-temperature water is increased in a gradient manner;
s3, low-temperature furnace returning:
and (4) placing the forging heated by the normal temperature water into a heating furnace for remelting and heating.
Optionally, the cooling liquid in the step S1 is liquid nitrogen, and the temperature of the liquid nitrogen is-110 to-125 ℃.
Optionally, in the step S1, the forged piece is placed between the top of the inner wall of the coolant tank and liquid nitrogen through the mechanical claw without contact, the forged piece is driven by the mechanical claw to rotate to generate cyclone, the rotation speed is 1100 rpm, and the time of the cryogenic treatment of the forged piece is 0.5 to 1.5 hours.
Optionally, the initial temperature of the normal temperature water in the S2 step is 20 ℃, and the normal temperature water is increased at 3 ℃/min until the temperature of the normal temperature water reaches 50 to 60 ℃.
Optionally, the normal temperature water in the step S2 is stirred at a stirring speed of 2 rpm, and the forging piece vertically enters the normal temperature water from the shorter side of the forging piece.
Optionally, the temperature of the heating furnace in the step S3 is 120 to 130 ℃, and the time for returning the forging is 1 to 1.5 hours.
The invention provides a method for reducing quenching residual stress of a die forging, which has the following beneficial effects:
this method for reducing die forging quenching residual stress, the forging is rotatory to be produced the cyclone and can attract air conditioning to press close to the forging surface with higher speed in the liquid nitrogen top, thereby accelerate forging cooling rate, 1 to 3 h's original cryrogenic processing time shortens to 0.5 to 1.5h, and the forging after the cooling is placed in normal atmospheric water and is heated slowly, avoid the forging to expand with heat rapidly and contract with cold and take place the embrittlement when slowly eliminating residual stress, and normal atmospheric temperature water can make the forging be heated through the stirring, and the forging time of going back to the stove through normal atmospheric temperature water heating also can shorten, thereby shorten the required time that residual stress eliminated, the machining efficiency of forging is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
The invention provides a technical scheme that: a method for reducing the quenching residual stress of a die forging comprises the following operation processes:
s1, cryogenic treatment of the forged piece:
placing the quenched forging into a cooling liquid tank for cryogenic treatment;
s2, slow warming:
placing the forging subjected to cryogenic treatment into normal-temperature water, wherein the temperature of the normal-temperature water is increased in a gradient manner;
s3, low-temperature furnace returning:
and (4) placing the forging heated by the normal temperature water into a heating furnace for remelting and heating.
The cooling liquid in the step S1 is liquid nitrogen, and the temperature of the liquid nitrogen is-110 to-125 ℃.
In the step S1, the forge piece is placed between the top of the inner wall of the cooling liquid tank and liquid nitrogen through the mechanical claw without contact, the forge piece is driven by the mechanical claw to rotate to generate cyclone, the rotating speed is 1100 r/min, and the time of the deep cooling treatment of the forge piece is 0.5-1.5 h.
The initial temperature of the normal temperature water in the S2 step is 20 deg.c, and the normal temperature water is increased at 3 deg.c/min until the temperature of the normal temperature water reaches 50 to 60 deg.c.
And (S2) stirring the normal-temperature water at the stirring speed of 2 r/S, and vertically feeding the forging into the normal-temperature water from the shorter side of the forging.
The temperature of the heating furnace in the step S3 is 120-130 ℃, and the time for returning the forge piece is 1-1.5 h.
The invention provides a method for reducing quenching residual stress of a die forging, which has the following beneficial effects:
the forging rotates above liquid nitrogen to generate cyclone to attract cold air to be close to the surface of the forging in an accelerating mode, so that the cooling speed of the forging is accelerated, the original 1 to 3h deep cooling treatment time is shortened to 0.5 to 1.5h, the cooled forging is placed in normal-temperature water to be heated slowly, the forging is prevented from being subjected to rapid thermal expansion and cold contraction to generate embrittlement while residual stress is eliminated slowly, the forging can be heated by normal-temperature water through stirring, the time required for returning the forging heated by the normal-temperature water to the furnace can be shortened, the time required for eliminating the residual stress is shortened, and the processing efficiency of the forging is improved.
In conclusion, the method for reducing the quenching residual stress of the die forging comprises the following operation processes:
s1, cryogenic treatment of the forged piece: placing the quenched forging into a cooling liquid tank for cryogenic treatment;
s2, slow warming: placing the forging subjected to cryogenic treatment into normal-temperature water, wherein the temperature of the normal-temperature water is increased in a gradient manner;
s3, low-temperature furnace returning: placing the forge piece heated by the normal temperature water into a heating furnace for remelting and heating;
this method for reducing die forging quenching residual stress, the forging is rotatory to be produced the cyclone and can attract air conditioning to press close to the forging surface with higher speed in the liquid nitrogen top, thereby accelerate forging cooling rate, 1 to 3 h's original cryrogenic processing time shortens to 0.5 to 1.5h, and the forging after the cooling is placed in normal atmospheric water and is heated slowly, avoid the forging to expand with heat rapidly and contract with cold and take place the embrittlement when slowly eliminating residual stress, and normal atmospheric temperature water can make the forging be heated through the stirring, and the forging time of going back to the stove through normal atmospheric temperature water heating also can shorten, thereby shorten the required time that residual stress eliminated, the machining efficiency of forging is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A method for reducing the quenching residual stress of a die forging is characterized by comprising the following steps: comprises the following steps:
s1, cryogenic treatment of the forged piece:
placing the quenched forging into a cooling liquid tank for cryogenic treatment;
s2, slow warming:
placing the forging subjected to cryogenic treatment into normal-temperature water, wherein the temperature of the normal-temperature water is increased in a gradient manner;
s3, low-temperature furnace returning:
and (4) placing the forging heated by the normal temperature water into a heating furnace for remelting and heating.
2. The method for reducing the quenching residual stress of the die forging according to claim 1, characterized in that: the cooling liquid in the step S1 is liquid nitrogen, and the temperature of the liquid nitrogen is-110 to-125 ℃.
3. The method for reducing the quenching residual stress of the die forging according to claim 1, characterized in that: and in the step S1, the forge piece is placed between the top of the inner wall of the cooling liquid tank and liquid nitrogen through the mechanical claw without contact, the forge piece is driven by the mechanical claw to rotate to generate cyclone, the rotating speed is 1100 r/min, and the time of the deep cooling treatment of the forge piece is 0.5-1.5 h.
4. The method for reducing the quenching residual stress of the die forging according to claim 1, characterized in that: the initial temperature of the normal temperature water in the S2 step is 20 ℃, and the normal temperature water is increased at 3 ℃/min until the temperature of the normal temperature water reaches 50 to 60 ℃.
5. The method for reducing the quenching residual stress of the die forging according to claim 1, characterized in that: and stirring the normal-temperature water in the step S2 at the stirring speed of 2 r/S, and vertically feeding the forging into the normal-temperature water from the shorter side of the forging.
6. The method for reducing the quenching residual stress of the die forging according to claim 1, characterized in that: the temperature of the heating furnace in the step S3 is 120-130 ℃, and the time for returning the forge piece is 1-1.5 h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113186377A (en) * | 2021-04-26 | 2021-07-30 | 二重（德阳）重型装备有限公司 | Heat treatment method for reducing residual stress of forging |
| CN114657485A (en) * | 2022-04-06 | 2022-06-24 | 苏州镭翼精工科技有限公司 | Aluminum alloy super-deep cooling stress removing method |
| CN114807547A (en) * | 2022-05-25 | 2022-07-29 | 江苏明越精密高温合金有限公司 | Method for reducing quenching residual stress of die forging |
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| CN1352320A (en) * | 2001-10-16 | 2002-06-05 | 甘肃工业大学 | Cryogenic treatment process for copper alloy band |
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2020
- 2020-09-30 CN CN202011060743.XA patent/CN112359300B/en active Active
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| CN1352320A (en) * | 2001-10-16 | 2002-06-05 | 甘肃工业大学 | Cryogenic treatment process for copper alloy band |
| CN104999242A (en) * | 2013-12-12 | 2015-10-28 | 安徽力源数控刃模具制造有限公司 | Machining method for upper die of special bending machine die for special Z-shaped workpieces |
| CN105200286A (en) * | 2015-11-07 | 2015-12-30 | 李白 | Small wind power generator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113186377A (en) * | 2021-04-26 | 2021-07-30 | 二重（德阳）重型装备有限公司 | Heat treatment method for reducing residual stress of forging |
| CN113186377B (en) * | 2021-04-26 | 2022-02-01 | 二重（德阳）重型装备有限公司 | Heat treatment method for reducing residual stress of forging |
| CN114657485A (en) * | 2022-04-06 | 2022-06-24 | 苏州镭翼精工科技有限公司 | Aluminum alloy super-deep cooling stress removing method |
| CN114807547A (en) * | 2022-05-25 | 2022-07-29 | 江苏明越精密高温合金有限公司 | Method for reducing quenching residual stress of die forging |
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