CN104805261A - Destressing method of high-precision valve body - Google Patents
Destressing method of high-precision valve body Download PDFInfo
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- CN104805261A CN104805261A CN201510153750.7A CN201510153750A CN104805261A CN 104805261 A CN104805261 A CN 104805261A CN 201510153750 A CN201510153750 A CN 201510153750A CN 104805261 A CN104805261 A CN 104805261A
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Abstract
The invention discloses a destressing method of a high-precision valve body. The destressing method comprises the following steps: 1) preheating a tempering furnace: preheating the tempering furnace to 200-250 DEG C; 2) feeding the valve body into the furnace: feeding a valve blank to be processed into the preheated tempering furnace; 3) heating and preserving heat in the furnace: when the temperature rise speed of the tempering furnace in heating is smaller than or equal to 80 DEG C/hour, heating the tempering furnace to 600-620 DEG C and preserving heat for a certain time; when the temperature rise speed of the tempering furnace in heating is larger than 80 DEG C/hour, firstly, heating the tempering furnace to 280-320 DEG C and preserving heat for a certain time, secondly heating to 380-420 DEG C and preserving heat for a certain time, thirdly heating to 480-520 DEG C and preserving hat for a certain time, and fourthly heating to 560-600 DEG C and preserving heat for a certain time; 4) discharging and cooling; 5) testing and warehousing. Through the way, the deformation coefficients during the machining process of the valve body can be reduced greatly, and the precision of the valve body is improved.
Description
Technical field
The present invention relates to valve body processing technique field, particularly relate to a kind of method for removing stress of high precision valve body.
Background technology
Existing valve body complete processing comprises roughing and precision work.At present, domestic valve body working accuracy lags behind external advanced country for a long time, and grade level is also poor external a lot of.
Because metallic substance can leave residual stress because of the ununiformity of distortion itself in machining process in material, and there is the situation of residual stress particularly drawing stress on surface in material internal, in materials'use process or the postorder course of processing, surperficial tensile stress can be residued in by early damage, be equivalent to additional external force and equally produce harm.In the course of processing, much stress can be gathered in metallic substance inside, and it can change the performance of metal, affects precision.
Summary of the invention
The technical problem that the present invention mainly solves is: for the deficiencies in the prior art, provides a kind of method for removing stress of high precision valve body, significantly can reduce the deformation coefficient of valve body in machining process, improves the precision of valve body.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: the method for removing stress providing a kind of high precision valve body, comprises the following steps:
1) tempering stove preheating: first tempering stove is preheated to 200-250 DEG C;
2) valve body enters stove: then send in preheated tempering stove by pending valve body blank;
3) heating and thermal insulation in stove:
If heat-up rate during tempering stove heating is less than or equal to 80 DEG C/h, then the tempering stove adding valve body blank is heated to 600-620 DEG C and held for some time;
If heat-up rate during tempering stove heating is greater than 80 DEG C/h, then first the tempering stove adding valve body blank is heated to 280-320 DEG C of insulation for some time, then 380-420 DEG C of insulation for some time is heated to, reheat to 480-520 DEG C of insulation for some time, be then heated to 560-600 DEG C of insulation for some time;
4) to come out of the stove cooling: then the valve body blank after heating and thermal insulation is shifted out tempering stove, and naturally cooling;
5) check, put in storage.
In a preferred embodiment of the present invention, if when the heat-up rate in described step 3) during tempering stove heating is less than or equal to 80 DEG C/h, its soaking time is: the net thickness × time coefficient of valve body blank.
In a preferred embodiment of the present invention, described time coefficient is 2.4min/mm.
In a preferred embodiment of the present invention, described soaking time is more than 4 hours.
In a preferred embodiment of the present invention, if when the heat-up rate in described step 3) during tempering stove heating is greater than 80 DEG C/h, be specially: first the tempering stove adding valve body blank is heated to 300 DEG C of insulations 1.5 hours, then 400 DEG C of insulations 1 hour is heated to, reheat to 500 DEG C of insulations 1 hour, be then heated to 580 DEG C of insulations 1 hour.
In a preferred embodiment of the present invention, described step 2) in send in tempering stove containing more than 20mm between adjacent two valve body blanks gap.
The invention has the beneficial effects as follows: by the method for removing stress of reasonably optimizing valve body, valve body deformation coefficient in machining process own is significantly declined, thus making the valve body precision after finally machining higher, the comparable valve body not doing destressing process improves more than 4 times.
Accompanying drawing explanation
Fig. 1 is the schema of the method for removing stress of a kind of high precision valve body of the present invention.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Embodiment one
A method for removing stress for high precision valve body, refers to Fig. 1, and it comprises the following steps:
1) tempering stove preheating: first tempering stove is preheated to 200-250 DEG C, is preferably 250 DEG C, can not more than 250 DEG C;
2) valve body enters stove: then sent in preheated tempering stove by pending valve body blank, and should contain the gap of more than 20mm between adjacent two valve body blanks, can stack by plug hole, but will strengthen the gap between valve body blank, to ensure that furnace gas is unimpeded;
3) heating and thermal insulation in stove: then the tempering stove adding valve body blank is heated to 600-620 DEG C with the heat-up rate of 75-80 DEG C/h, described heat-up rate is less than or equal to 8080 DEG C/h, is preferably 80 DEG C/h; Then make the tempering stove inside holding certain hour that valve body blank is heating, described soaking time is: the net thickness × time coefficient of valve body blank, and wherein: described time coefficient is 2.4min/mm, described soaking time should more than 4 hours;
4) to come out of the stove cooling: then the valve body blank after insulation is shifted out tempering stove, and naturally cooling;
5) check, put in storage.
Through the valve body blank of destressing process of the present invention, after roughing, be natural aging 10-12 hour again, and then do semi-finishing, then natural aging 10-12 hour is again, precision work again, can realize high precision object, and the comparable valve body not doing destressing process of its precision improves more than 4 times.
Embodiment two
A method for removing stress for high precision valve body, refers to Fig. 1, and it comprises the following steps:
1) tempering stove preheating: first tempering stove is preheated to 200-250 DEG C, is preferably 250 DEG C, can not more than 250 DEG C;
2) valve body enters stove: then sent in preheated tempering stove by pending valve body blank, and should contain the gap of more than 20mm between adjacent two valve body blanks, can stack by plug hole, but will strengthen the gap between valve body blank, to ensure that furnace gas is unimpeded;
3) heating and thermal insulation in stove: when heat-up rate during tempering stove heating is more than 80 DEG C/h, first the tempering stove adding valve body blank is heated to 280-320 DEG C of insulation for some time, then 380-420 DEG C of insulation for some time is heated to, reheat to 480-520 DEG C of insulation for some time, be then heated to 560-600 DEG C of insulation for some time; Be preferably: first the tempering stove adding valve body blank is heated to 300 DEG C of insulations 1.5 hours, be then heated to 400 DEG C of insulations 1 hour, reheat to 500 DEG C of insulations 1 hour, be then heated to 580 DEG C of insulations 1 hour;
4) to come out of the stove cooling: then the valve body blank after insulation is shifted out tempering stove, and naturally cooling;
5) check, put in storage.
Through the valve body blank of destressing process of the present invention, after roughing, be natural aging 10-12 hour again, and then do semi-finishing, then natural aging 10-12 hour is again, precision work again, can realize high precision object, and the comparable valve body not doing destressing process of its precision improves more than 4 times.
Present invention is disclosed a kind of method for removing stress of high precision valve body, by the method for removing stress of reasonably optimizing valve body, valve body deformation coefficient in machining process own is significantly declined, thus making the valve body precision after finally machining higher, the comparable valve body not doing destressing process improves more than 4 times.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification sheets of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. a method for removing stress for high precision valve body, is characterized in that, comprises the following steps:
1) tempering stove preheating: first tempering stove is preheated to 200-250 DEG C;
2) valve body enters stove: then send in preheated tempering stove by pending valve body blank;
3) heating and thermal insulation in stove:
If heat-up rate during tempering stove heating is less than or equal to 80 DEG C/h, then the tempering stove adding valve body blank is heated to 600-620 DEG C and held for some time;
If heat-up rate during tempering stove heating is greater than 80 DEG C/h, then first the tempering stove adding valve body blank is heated to 280-320 DEG C of insulation for some time, then 380-420 DEG C of insulation for some time is heated to, reheat to 480-520 DEG C of insulation for some time, be then heated to 560-600 DEG C of insulation for some time;
4) to come out of the stove cooling: then the valve body blank after heating and thermal insulation is shifted out tempering stove, and naturally cooling;
5) check, put in storage.
2. the method for removing stress of high precision valve body according to claim 1, is characterized in that, if when the heat-up rate in described step 3) during tempering stove heating is less than or equal to 80 DEG C/h, its soaking time is: the net thickness × time coefficient of valve body blank.
3. the method for removing stress of high precision valve body according to claim 2, is characterized in that, described time coefficient is 2.4min/mm.
4. the method for removing stress of high precision valve body according to claim 2, is characterized in that, described soaking time is more than 4 hours.
5. the method for removing stress of high precision valve body according to claim 1, it is characterized in that, if when the heat-up rate in described step 3) during tempering stove heating is greater than 80 DEG C/h, be specially: first the tempering stove adding valve body blank is heated to 300 DEG C of insulations 1.5 hours, then 400 DEG C of insulations 1 hour is heated to, reheat to 500 DEG C of insulations 1 hour, be then heated to 580 DEG C of insulations 1 hour.
6. the method for removing stress of high precision valve body according to claim 1, is characterized in that, described step 2) in send in tempering stove containing more than 20mm between adjacent two valve body blanks gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510153750.7A CN104805261A (en) | 2015-04-02 | 2015-04-02 | Destressing method of high-precision valve body |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510153750.7A CN104805261A (en) | 2015-04-02 | 2015-04-02 | Destressing method of high-precision valve body |
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| CN104805261A true CN104805261A (en) | 2015-07-29 |
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| CN201510153750.7A Pending CN104805261A (en) | 2015-04-02 | 2015-04-02 | Destressing method of high-precision valve body |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724806A (en) * | 2019-10-17 | 2020-01-24 | 江苏福旺重工科技有限公司 | Destressing processing technology for reinforcing plate processing |
| CN111961820A (en) * | 2020-07-22 | 2020-11-20 | 金华浩翔汽配有限公司 | Method for reducing internal stress of product by using high-temperature oven |
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| JP2000042922A (en) * | 1998-07-29 | 2000-02-15 | Suncall Corp | Surface treatment method for spring |
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| CN102453919A (en) * | 2010-10-21 | 2012-05-16 | 徐金兰 | Nitrogen treatment and destressing process |
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| WO2014129034A1 (en) * | 2013-02-21 | 2014-08-28 | Ｊｆｅスチール株式会社 | Production method for semi-processed non-oriented electromagnetic steel sheet exhibiting superior magnetic properties |
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2015
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| JP2000042922A (en) * | 1998-07-29 | 2000-02-15 | Suncall Corp | Surface treatment method for spring |
| CN101906523A (en) * | 2009-06-02 | 2010-12-08 | 上海重型机器厂有限公司 | Heat treatment process of nuclear power reactor pressure vessel reactor core cylinder forgings |
| CN102453919A (en) * | 2010-10-21 | 2012-05-16 | 徐金兰 | Nitrogen treatment and destressing process |
| WO2014129034A1 (en) * | 2013-02-21 | 2014-08-28 | Ｊｆｅスチール株式会社 | Production method for semi-processed non-oriented electromagnetic steel sheet exhibiting superior magnetic properties |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724806A (en) * | 2019-10-17 | 2020-01-24 | 江苏福旺重工科技有限公司 | Destressing processing technology for reinforcing plate processing |
| CN111961820A (en) * | 2020-07-22 | 2020-11-20 | 金华浩翔汽配有限公司 | Method for reducing internal stress of product by using high-temperature oven |
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