CN105403048A - Long-time continuous working heating furnace used for creep endurance testing machine - Google Patents
Long-time continuous working heating furnace used for creep endurance testing machine Download PDFInfo
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- CN105403048A CN105403048A CN201510927674.0A CN201510927674A CN105403048A CN 105403048 A CN105403048 A CN 105403048A CN 201510927674 A CN201510927674 A CN 201510927674A CN 105403048 A CN105403048 A CN 105403048A
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- furnace
- silk
- heating furnace
- heating
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/02—Furnaces of a kind not covered by any preceding group specially designed for laboratory use
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/10—Monolithic linings; Supports therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/02—Ohmic resistance heating
Abstract
The invention relates to a long-time continuous working heating furnace used for a creep endurance testing machine, and the long-time continuous working heating furnace is applied to long-time creep endurance performance testing and service evaluating of metal materials. The long-time continuous working furnace is characterized in that the design of double furnace wires is adopted for the heating furnace; two sets of heating wires are independently wound on a furnace tube at intervals; and due to the design of a control system, when a working furnace wire set is subjected to heating interruption due to faults, a standby furnace wire set is switched and started, the problem that testing is interrupted due to faults of the furnace wires of the heating furnace in the creep endurance performance testing process of the metal materials is solved, and the long-time continuous service life of the heating furnace is prolonged. A method is simple and easy to implement and is easily achieved in high-temperature heating furnaces for creep endurance testing machines and other electric heating wire heating equipment, and industrial production can be achieved.
Description
Technical field
The invention belongs to metal material mechanics performance test analysis particularly long time creep rupture performance test analysis field, be specifically related to a kind of creep and stress rupture test machine continuous operation heating furnace time long.
Background technology
At a certain temperature, when keeping stress constant, the phenomenon that strain extends in time and increases is called creep to solid material.The creep behaviour of material is time, stress, the coefficient result of temperature, as long as the time long enough of effect, creep also can occur much smaller than during elastic limit at stress.Equally, the creep behaviour of material also can occur at low temperatures, but only reaches certain temperature and just can become remarkable, and this temperature is called the creep temperature of material.It is fusion temperature that the creep temperature of various metal material is about 0.3Tm(Tm, represents with thermodynamic temperature), for some low-melting-point metals as lead, tin etc., under greenhouse, will creep be there is.Therefore, the component worked under high temperature loaded condition time long for the energy, petrochemical industry, aerospace field, creep impairment is its main failure mode, and the creep life of material is one of basic mechanical behavior under high temperature of the necessary reference of material development, member designs, life prediction and reliability assessment.
1905 Britain's Karen Phillips (F.Philips) first observe creep wiry, but until after nineteen twenty-two Britain's Dickenson (Dickenson) delivered the creep experiments of steel, people just start to recognize that creep all can occur high temperature carrying lower hardware, from then on creep test research come into one's own, and by 10
5stress corresponding during h creep rupture, is called creep rupture strength or the stress-rupture strength limit of material, specifies its foundation designed for high-temperature structural material.But in the thirties in 20th century, the creep rupture test under material uniform temperature can not carry out 10 continuously
5h, the stress-rupture strength limit of material is difficult to be obtained by test actual measurement.Therefore, researcher proposes various high-temperature structural material creep rupture strength Extrapolation method successively, and these are exactly the prototype of high-temperature structural material Life Assessment Technology.Along with the development of science and technology, a large amount of 10
5h even 2 × 10
5the appearance of h creep rupture data, scientific research personnel especially engineers and technicians has carried out continuous inspection, analysis and summary and optimization to Extrapolation method, define existing high-temperature structural material appraisal procedure creep life system: creep rupture strength model (isothermal Extrapolating model, Time-temperature parameter model, Robinson life consumption model), deformation of creep model (θ predicted method, creep curve extrapolate) and based on the creep impairment cracking of fracture mechanics and crack propagation model.
According to the regulation of international standard, when utilizing Extrapolating model to carry out the assessment of metal material creep life, minimum test duration lower than 1/3 of extrapolation life-span, that is: should will not obtain material creep fracture strength or stress-rupture strength limit, minimum creep and stress rupture test when needing to carry out 3300 hours long.In the course of work of creep and stress rupture test machine high temperature high temperature when long, because constant temperature is higher, the reasons such as stove silk and electrode loose contact, can cause the stove silk oxidation of high temperature furnace to disconnect.Once certain section of stove silk of high temperature furnace disconnects, the temperature of this section will decline at once, high-temerature creep test just cannot proceed, the test error caused thus has irrecoverability, the performance data of material just needs to restart assessment, cause the significant wastage of resource, therefore, when ensureing creep and stress rupture test machine heating-furnace silk long, continuous operation has great significance to creep rupture performance test during metal material long.
Summary of the invention
The present invention proposes a kind of creep and stress rupture test machine continuous operation heating furnace time long, continuous operation during by the design of twin furnace silk to ensure heating furnace long.
A kind of creep and stress rupture test machine continuous operation heating furnace time long, is characterized in that, described heating furnace by the design of twin furnace silk to ensure heating furnace long time continuous operation.
Further, described heating furnace body is straight barrel type structure, described heating furnace comprises: boiler tube, furnace lining, end cap, cover plate, stove silk assembly and furnace shell, the upper and lower two ends of described boiler tube all arrange described end cap, described boiler tube is arranged within described furnace lining, described furnace shell is coated on described furnace lining surface, and described stove silk assembly is connected with described boiler tube, and described cover plate is connected with described end cap by hex screw.
Further, described furnace lining comprises: convected air layer and heat-insulation layer, described heat-insulation layer is near described boiler tube, described convected air layer is near described furnace shell, described heat-insulation layer is high temperature fiber insulation material, described convected air layer is cavity, is provided with interior lining panel between described convected air layer and heat-insulation layer, and upper and lower both sides, described furnace shell side are provided with convected air mouth.
Further, described boiler tube side is provided with double spiral groove.
Further; described stove silk assembly comprises: working furnace silk, standby boiler silk, stove silk binding post, electrode fixed head and power connection protective cover; described heating furnace is upper, middle and lower Three-section type heating; upper, middle and lower portion working furnace silk and the standby boiler silk described in coiling respectively of described boiler tube, described working furnace silk group and standby boiler silk group unique spacer are wound in the double spiral groove of boiler tube side.
Further; described electrode fixed head is fixed on described furnace shell; described stove silk binding post is fixed on described electrode fixed head; described working furnace silk, standby boiler silk two ends connect with corresponding stove silk binding post respectively; described power connection protective cover is arranged on described furnace shell, and described working furnace silk, standby boiler silk, stove silk binding post, electrode fixed head are all contained in described power connection protective cover.
Compared with existing heating furnace, feature of the present invention is, can working furnace silk group break down add thermal break time, start fast standby boiler silk group, in the temperature fluctuation range of standard-required, ensure the continuous operation of heating furnace, the working life of heating furnace can be made theoretically to double.
Accompanying drawing explanation
Fig. 1 is heating furnace vertical section structure schematic diagram of the present invention;
Fig. 2 is heating furnace cross-sectional structure schematic diagram of the present invention;
Fig. 3 is the temperature curve in the embodiment of the present invention 1 heating furnace mariages handoff procedure.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is explained in further detail.Should be appreciated that specific embodiment described herein only for explaining the present invention, being not intended to limit the present invention.
On the contrary, the present invention is contained any by the substituting of making on marrow of the present invention and scope of defining of claim, amendment, equivalent method and scheme.Further, in order to make the public have a better understanding to the present invention, in hereafter details of the present invention being described, detailedly describe some specific detail sections.Do not have the description of these detail sections can understand the present invention completely for a person skilled in the art yet.
A kind of creep and stress rupture test machine continuous operation heating furnace time long, described heating furnace by the design of twin furnace silk to ensure heating furnace long time continuous operation, described heating furnace body is straight barrel type structure, described heating furnace comprises: boiler tube 1, furnace lining 2, end cap 3, cover plate 4, stove silk assembly 5 and furnace shell 6, described boiler tube about 1 two ends all arrange described end cap 3, described boiler tube 1 is arranged within described furnace lining 2, described furnace shell 6 is coated on described furnace lining 2 surface, described stove silk assembly 5 is connected with described boiler tube 1, and described cover plate 4 is connected with described end cap 3 by hex screw.Described furnace lining 2 comprises: convected air layer 21 and heat-insulation layer 22, described heat-insulation layer 22 is near described boiler tube 1, described convected air layer 21 is near described furnace shell 6, described heat-insulation layer 22 is high temperature fiber insulation material, described convected air layer 21 is cavity, be provided with interior lining panel 23 between described convected air layer 21 and heat-insulation layer 22, upper and lower both sides, described furnace shell 6 side are provided with convected air mouth 61.Described boiler tube 1 side is provided with double spiral groove, and described boiler tube 1 can be muffle tube.Described stove silk assembly 5 comprises: working furnace silk 51, standby boiler silk 52, stove silk binding post 53, electrode fixed head 54 and power connection protective cover 55, described heating furnace is upper, middle and lower Three-section type heating, described boiler tube 1 upper, in, bottom is working furnace silk 51 and standby boiler silk 52 described in coiling respectively, described working furnace silk group and standby boiler silk group unique spacer are wound in the double spiral groove inside boiler tube 1, described electrode fixed head 54 is fixed on described furnace shell 6, described stove silk binding post 53 is fixed on described electrode fixed head 54, described working furnace silk 51, standby boiler silk 52 two ends connect with corresponding stove silk binding post 53 respectively, described power connection protective cover 55 is arranged on described furnace shell 6, described working furnace silk 51, standby boiler silk 52, stove silk binding post 53, electrode fixed head 54 is all contained in described power connection protective cover 55.Described stove silk binding post 53 adopts unique bushing type design, is connect, form stable syndeton by high temperature alloy welding wire and stove wire bond.Work and two cover heater strip for subsequent use form selectable closed loop configuration by control system, during on-test, first start work heater strip, when work heater strip breaks down and adds thermal break, switch heater strip, start standby boiler silk 52 groups and work on.
By system test and the accurately measurement of best temperature control parameter under work and standby boiler silk different temperatures, when 800 DEG C, standby boiler silk group is started after working furnace silk group fault, heating furnace can be stabilized to original target temperature within 5 minutes, and the temperature-averaging fluctuation in stabilization process is less than 5 DEG C, meets international standard ISO204-2009 and domestic standard GB2039-2-12 completely to the requirement of temperature fluctuation in creep and stress rupture test process.
[embodiment 1]the working furnace silk group of startup heating furnace, to be heated after target temperature 800 DEG C also stable rear cut-out working furnace silk group 5min, start standby boiler silk group; After cutting off standby boiler silk group 15min after Quadratic Stability, again start working furnace silk group for subsequent use; After again cutting off work heater strip 5min after stablizing for three times, start standby boiler silk group; After four stable rear final cutting standby boiler silk group 2min, start working furnace silk group.
Temperature variation curve as can be seen from the mariages heating-furnace silk handoff procedure that embodiment obtains, in the course of work, when working furnace silk group breaks down and adds thermal break, if staff or control system can in 5min in heater strip is switched to standby boiler silk group, in whole handoff procedure, the furnace temperature fluctuation of heating furnace upper, middle and lower segment can be controlled within 5 DEG C, and the full international standard ISO204-2009 and domestic standard GB2039-2-12 of this temperature fluctuation is to the requirement of temperature fluctuation in creep and stress rupture test process time long.
In sum, the theoretical life-span of creep rupture high-temperature heater can be enhanced about more than once in the temperature-controlled precision of at home and abroad standard-required by the present invention, effectively can ensure the stream time of heating furnace.
Compared with existing heating furnace, feature of the present invention is, can working furnace silk group break down add thermal break time, start fast standby boiler silk group, in the temperature fluctuation range of standard-required, ensure the continuous operation of heating furnace, the working life of heating furnace can be made theoretically to double.
Claims (6)
1. creep and stress rupture test machine continuous operation heating furnace time long, is characterized in that, described heating furnace by the design of twin furnace silk to ensure heating furnace long time continuous operation.
2. heating furnace according to claim 1, it is characterized in that, described heating furnace body is straight barrel type structure, described heating furnace comprises: boiler tube, furnace lining, end cap, cover plate, stove silk assembly and furnace shell, the upper and lower two ends of described boiler tube all arrange described end cap, and described boiler tube is arranged within described furnace lining, and described furnace shell is coated on described furnace lining surface, described stove silk assembly is connected with described boiler tube, and described cover plate is connected with described end cap by hex screw.
3. heating furnace according to claim 2, it is characterized in that, described furnace lining comprises: convected air layer and heat-insulation layer, described heat-insulation layer is near described boiler tube, described convected air layer is near described furnace shell, and described heat-insulation layer is high temperature fiber insulation material, and described convected air layer is cavity, be provided with interior lining panel between described convected air layer and heat-insulation layer, upper and lower both sides, described furnace shell side are provided with convected air mouth.
4. heating furnace according to claim 2, it is characterized in that, described boiler tube side is provided with double spiral groove.
5. heating furnace according to claim 2; it is characterized in that; described stove silk assembly comprises: working furnace silk, standby boiler silk, stove silk binding post, electrode fixed head and power connection protective cover; described heating furnace is upper, middle and lower Three-section type heating; upper, middle and lower portion working furnace silk and the standby boiler silk described in coiling respectively of described boiler tube, described working furnace silk group and standby boiler silk group unique spacer are wound in the double spiral groove of boiler tube side.
6. heating furnace according to claim 5; it is characterized in that; described electrode fixed head is fixed on described furnace shell; described stove silk binding post is fixed on described electrode fixed head; described working furnace silk, standby boiler silk two ends connect with corresponding stove silk binding post respectively; described power connection protective cover is arranged on described furnace shell, and described working furnace silk, standby boiler silk, stove silk binding post, electrode fixed head are all contained in described power connection protective cover.
Priority Applications (1)
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| CN201510927674.0A CN105403048A (en) | 2015-12-14 | 2015-12-14 | Long-time continuous working heating furnace used for creep endurance testing machine |
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| CN201510927674.0A CN105403048A (en) | 2015-12-14 | 2015-12-14 | Long-time continuous working heating furnace used for creep endurance testing machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403602A (en) * | 2016-09-12 | 2017-02-15 | 中国航空工业集团公司北京航空材料研究院 | Heating furnace for creeping and stress rupture test for muffle furnace structure |
| CN113358483A (en) * | 2021-05-25 | 2021-09-07 | 常州市华纺纺织仪器有限公司 | High-strength fibril temperature control creep value tester and working method thereof |
| CN115046843A (en) * | 2022-05-19 | 2022-09-13 | 中国科学院精密测量科学与技术创新研究院 | Metal zero-length spring normal-temperature creep batch rapid detection device |
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| US5015825A (en) * | 1990-03-19 | 1991-05-14 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | Furnace for tensile/fatigue testing |
| JP2000321187A (en) * | 1999-05-07 | 2000-11-24 | Shimadzu Corp | Compression creep-testing machine |
| CN101706213A (en) * | 2009-12-11 | 2010-05-12 | 中国航空工业集团公司北京航空材料研究院 | Heating furnace for creep and rupture life tester |
| CN204574795U (en) * | 2015-04-19 | 2015-08-19 | 长春机械科学研究院有限公司 | Two heating system atmospheric furnace device |
| CN205228147U (en) * | 2015-12-14 | 2016-05-11 | 北京科技大学 | Creep and stress rupture test machine long term continuous operation heating furnace |
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2015
- 2015-12-14 CN CN201510927674.0A patent/CN105403048A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5015825A (en) * | 1990-03-19 | 1991-05-14 | The United States Of America As Represented By The United States National Aeronautics And Space Administration | Furnace for tensile/fatigue testing |
| JP2000321187A (en) * | 1999-05-07 | 2000-11-24 | Shimadzu Corp | Compression creep-testing machine |
| CN101706213A (en) * | 2009-12-11 | 2010-05-12 | 中国航空工业集团公司北京航空材料研究院 | Heating furnace for creep and rupture life tester |
| CN204574795U (en) * | 2015-04-19 | 2015-08-19 | 长春机械科学研究院有限公司 | Two heating system atmospheric furnace device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403602A (en) * | 2016-09-12 | 2017-02-15 | 中国航空工业集团公司北京航空材料研究院 | Heating furnace for creeping and stress rupture test for muffle furnace structure |
| CN113358483A (en) * | 2021-05-25 | 2021-09-07 | 常州市华纺纺织仪器有限公司 | High-strength fibril temperature control creep value tester and working method thereof |
| CN115046843A (en) * | 2022-05-19 | 2022-09-13 | 中国科学院精密测量科学与技术创新研究院 | Metal zero-length spring normal-temperature creep batch rapid detection device |
| CN115046843B (en) * | 2022-05-19 | 2023-08-29 | 中国科学院精密测量科学与技术创新研究院 | Quick detection device in batches is creep of metal zero length spring normal atmospheric temperature |
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Application publication date: 20160316 |
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