CN111961820A - Method for reducing internal stress of product by using high-temperature oven - Google Patents
Method for reducing internal stress of product by using high-temperature oven Download PDFInfo
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- CN111961820A CN111961820A CN202010709054.0A CN202010709054A CN111961820A CN 111961820 A CN111961820 A CN 111961820A CN 202010709054 A CN202010709054 A CN 202010709054A CN 111961820 A CN111961820 A CN 111961820A
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- temperature
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- internal stress
- temperature oven
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a method for reducing internal stress, and discloses a method for reducing internal stress of a product by using a high-temperature oven, which comprises three to four steps, wherein the first step is an adaptation process, the temperature is increased to 150 ℃ by adopting a gradual increase mode, the adaptation process of the temperature is given to the product, the second step is to increase the temperature to the required high temperature and keep the temperature at the high temperature for 5 minutes for heating so as to reduce the internal stress of the product, and the third step is to take out and cool the product with the stress removed; in addition, if the internal stress is required to be removed to a greater extent, a fourth step is added, the cooled product is put into the oven again, the temperature is rapidly raised to 500 ℃, and the product is kept for a certain time to remove the internal stress again; the nitrogen is flushed into the oven in the whole heating process, so that the influence of moisture and other components in the air in the heating process is avoided, and compared with a common constant-temperature aging method, the method has the advantages of good internal stress removing effect, high speed and high efficiency.
Description
Technical Field
The invention belongs to a method for reducing internal stress, and particularly relates to a method for reducing internal stress of a product by using a high-temperature oven.
Background
At present, in the casting process, raw materials generate stress, the stress can cause the cast product to generate larger deformation and influence the precision and quality of the product, therefore, stress removal becomes more important, the existing constant temperature aging method is generally adopted, the mechanism of the constant temperature aging method is to relax the stress through plastic deformation, the stress reduction speed is higher at the beginning of the method, and then the stress reduction speed is reduced; the higher the heating temperature and the longer the heating time, the more obvious the stress reduction effect is, but the too long heating time causes low production efficiency and greatly increases the cost.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides a method for reducing the internal stress of a product by using a high-temperature oven, and solves the problems in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of reducing internal stress in a product using a high temperature oven, comprising the steps of: a, placing the cast product into a high-temperature oven to be heated from room temperature to 150 ℃ for 1min, wherein the temperature of the high-temperature oven is gradually increased in the process; b, keeping the temperature of the high-temperature oven at the temperature for 2 min; c, directly increasing the temperature of the high-temperature oven to 400 ℃, and keeping the temperature for heating for 5 min; d, taking out the product from the high-temperature oven, and cooling the product in an environment at the temperature of 20-40 ℃; in the step A, after the product is placed in a high-temperature oven, nitrogen is firstly filled into the high-temperature oven, and then heating is carried out.
Preferably, nitrogen is flushed until the air in the high temperature oven is evacuated.
Preferably, the method further comprises a step E of putting the cooled product into a high-temperature oven again, rapidly heating to 500 ℃, keeping for 3min, taking out the product, and cooling to normal temperature at normal temperature; the oven was also flushed with nitrogen during this process.
Compared with the prior art, the invention provides a method for reducing the internal stress of a product by using a high-temperature oven, which has the following advantages: the method comprises three to four steps, wherein the first step is an adaptation process, the temperature is increased to 150 ℃ by adopting a gradual increase mode, the adaptation process of the temperature is provided for a product, the second step is to increase the temperature to the required high temperature and keep the temperature at the high temperature for 5 minutes for heating so as to reduce the internal stress of the product, and the third step is to take out and cool the product with the stress removed; in addition, if the internal stress is required to be removed to a greater extent, a fourth step is added, the cooled product is put into the oven again, the temperature is rapidly raised to 500 ℃, and the product is kept for a certain time to remove the internal stress again; nitrogen is filled into the oven in the whole heating process, so that the influence of moisture and other components in the air in the heating process is avoided; compared with the common constant-temperature aging method, the method has the advantages of good internal stress removing effect, high speed and high efficiency.
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, but the present invention is not limited to these embodiments.
A method of reducing internal stress in a product using a high temperature oven, comprising the steps of: a, placing the cast product into a high-temperature oven to be heated from room temperature to 150 ℃ for 1min, wherein the temperature of the high-temperature oven is gradually increased in the process; b, keeping the temperature of the high-temperature oven at the temperature for 2 min; c, directly increasing the temperature of the high-temperature oven to 400 ℃, and keeping the temperature for heating for 5 min; d, taking out the product from the high-temperature oven, and cooling the product in an environment at the temperature of 20-40 ℃; in the step A, after the product is placed in a high-temperature oven, nitrogen is firstly filled into the high-temperature oven, and then heating is carried out.
Preferably, nitrogen is flushed until the air in the high temperature oven is evacuated.
Preferably, the method further comprises a step E of putting the cooled product into a high-temperature oven again, rapidly heating to 500 ℃, keeping for 3min, taking out the product, and cooling to normal temperature at normal temperature; the oven was also flushed with nitrogen during this process.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (3)
1. A method of reducing internal stress in a product using a high temperature oven, comprising the steps of: a, placing the cast product into a high-temperature oven to be heated from room temperature to 150 ℃ for 1min, wherein the temperature of the high-temperature oven is gradually increased in the process; b, keeping the temperature of the high-temperature oven at the temperature for 2 min; c, directly increasing the temperature of the high-temperature oven to 400 ℃, and keeping the temperature for heating for 5 min; d, taking out the product from the high-temperature oven, and cooling the product in an environment at the temperature of 20-40 ℃; in the step A, after the product is placed in a high-temperature oven, nitrogen is firstly filled into the high-temperature oven, and then heating is carried out.
2. A method of reducing stress in a product using a high temperature oven according to claim 1, wherein: the nitrogen gas was flushed until the air in the high temperature oven was evacuated.
3. A method of reducing stress in a product using a high temperature oven according to claim 1, wherein: step E, putting the cooled product into a high-temperature oven again, rapidly heating to 500 ℃, keeping for 3min, taking out the product, and cooling to normal temperature at normal temperature; the oven was also flushed with nitrogen during this process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010709054.0A CN111961820A (en) | 2020-07-22 | 2020-07-22 | Method for reducing internal stress of product by using high-temperature oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010709054.0A CN111961820A (en) | 2020-07-22 | 2020-07-22 | Method for reducing internal stress of product by using high-temperature oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111961820A true CN111961820A (en) | 2020-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010709054.0A Pending CN111961820A (en) | 2020-07-22 | 2020-07-22 | Method for reducing internal stress of product by using high-temperature oven |
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| CN (1) | CN111961820A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030050727A (en) * | 2001-12-19 | 2003-06-25 | 현대자동차주식회사 | Treatment method for welding portion of the bumper cover mold |
| CN101698898A (en) * | 2009-11-10 | 2010-04-28 | 贵州大学 | Method for removing stress by using variable-frequency electromagnetic pulses |
| CN104805261A (en) * | 2015-04-02 | 2015-07-29 | 苏州市鑫渭阀门有限公司 | Destressing method of high-precision valve body |
| CN104889695A (en) * | 2015-06-17 | 2015-09-09 | 沈阳飞机工业（集团）有限公司 | Large composite material curved surface tool stress release process method |
| CN107119245A (en) * | 2017-03-23 | 2017-09-01 | 中南大学 | A kind of multistage annealing process of the strong big ingot blank of high temperature resistant magnesium alloy of superelevation |
| CN107557560A (en) * | 2017-09-25 | 2018-01-09 | 西安长峰机电研究所 | A kind of stress relief annealing method of thin-wall barrel girth joint |
| CN108676973A (en) * | 2018-06-08 | 2018-10-19 | 铃木加普腾钢丝（苏州）有限公司 | A kind of method of oil-temper spring steel wire destressing |
| CN112111679A (en) * | 2020-09-16 | 2020-12-22 | 宁波锦越新材料有限公司 | High-quality aluminum alloy for semiconductor and preparation method thereof |
| CN113025800A (en) * | 2021-03-03 | 2021-06-25 | 哈尔滨工业大学 | Stress relieving method of electrically-propelled hollow cathode heating wire |
-
2020
- 2020-07-22 CN CN202010709054.0A patent/CN111961820A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030050727A (en) * | 2001-12-19 | 2003-06-25 | 현대자동차주식회사 | Treatment method for welding portion of the bumper cover mold |
| CN101698898A (en) * | 2009-11-10 | 2010-04-28 | 贵州大学 | Method for removing stress by using variable-frequency electromagnetic pulses |
| CN104805261A (en) * | 2015-04-02 | 2015-07-29 | 苏州市鑫渭阀门有限公司 | Destressing method of high-precision valve body |
| CN104889695A (en) * | 2015-06-17 | 2015-09-09 | 沈阳飞机工业（集团）有限公司 | Large composite material curved surface tool stress release process method |
| CN107119245A (en) * | 2017-03-23 | 2017-09-01 | 中南大学 | A kind of multistage annealing process of the strong big ingot blank of high temperature resistant magnesium alloy of superelevation |
| CN107557560A (en) * | 2017-09-25 | 2018-01-09 | 西安长峰机电研究所 | A kind of stress relief annealing method of thin-wall barrel girth joint |
| CN108676973A (en) * | 2018-06-08 | 2018-10-19 | 铃木加普腾钢丝（苏州）有限公司 | A kind of method of oil-temper spring steel wire destressing |
| CN112111679A (en) * | 2020-09-16 | 2020-12-22 | 宁波锦越新材料有限公司 | High-quality aluminum alloy for semiconductor and preparation method thereof |
| CN113025800A (en) * | 2021-03-03 | 2021-06-25 | 哈尔滨工业大学 | Stress relieving method of electrically-propelled hollow cathode heating wire |
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Application publication date: 20201120 |
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