CN106363071A - Method for precise forming of valve rupture film - Google Patents
Method for precise forming of valve rupture film Download PDFInfo
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- CN106363071A CN106363071A CN201510425889.2A CN201510425889A CN106363071A CN 106363071 A CN106363071 A CN 106363071A CN 201510425889 A CN201510425889 A CN 201510425889A CN 106363071 A CN106363071 A CN 106363071A
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Abstract
The invention discloses a method for precise forming of a 1mm-thick pure-aluminum valve rupture film of a carrier rocket and belongs to the field of metal forming. The valve rupture film is an important part of a pressure valve of a storage box pipeline of the carrier rocket and plays an important role in pipeline communicating. Traditional production of the rupture film always relies on experience to determine a forming sequence and forming technological parameters, so that film products have a long production cycle and a low percent of pass. According to the invention, corresponding methods such as raw material screening, forming parameter mold testing and laser damage-free measurement are designed based on key features of the valve rupture film, so that the problem about the percent of pass of the rupture film can be solved.
Description
Technical field
The invention belongs to metal molding field is and in particular to the accurate forming method of valve rupture disc.
Background technology
Rupture disc is carrier rocket tank line pressure valve strength member, carries the important function of pipeline connection.Rocket engine relies on diaphragm assembly to separate fuel tank and pressure charging system before starting, and after rocket firing starts, makes rupture of diaphragm, first use by the effect of pressurization gas pressure, reliability requirement is high.The key characteristic of rupture disc is its fracture pressure value, after rupture disc loads pressure valve assembly housing, rupture disc no indentation one side is passed through compressed air positive pressure 0.6mpa, pressurize 3min, answers crack-free, gas leakage, keeps positive pressure, again from there being indentation face to be slowly introducing compressed air, until rupturing at diaphragm indentation, buffer brake should be 1.0 ± 0.1mpa, answers indentation total length to rupture after taking out diaphragm.
By analyzing to rupture disc technical specification, its material property, width of nick are the important parameters of impact rupture disc fracture pressure, and in entire block, material property, the concordance of width of nick are the key factors affecting membrane products qualification rate by the gross.
Rupture disc traditional mode of production often relies on empirically determined forming sequence and forming parameters, membrane products long the production cycle, when carrying out bulk sampling test after the completion of production, if occurring a piece of rupture disc fracture pressure exceeded, then need by the gross to scrap, again suppress, therefore qualification rate is extremely low, taking active service model carrier rocket rupture disc as a example, the qualified rupture disc generally producing a batch needs the time of 2 months, and the production qualification rate of diaphragm is less than 5% in process of production, lead to diaphragm production cost high, seriously constrain carrier rocket entirety development and production progress.
New generation's carrier rocket valve rupture disc is nervous due to the development and production cycle, and task amount weight proposes requirements at the higher level to diaphragm reliability, dimensional accuracy etc., substantially cannot meet the Project R＆D progress of anxiety using simple test method.In the urgent need to, on the basis of grasping rupture disc key characteristic, the corresponding raw material of design shines the methods such as choosing, forming sequence, die trial forming parameter, selective mechanisms, solves the problems, such as rupture disc qualification rate.
Content of the invention
Deficiency for said method, the technical problem to be solved is based on valve rupture disc key characteristic, design corresponding raw material and shine choosing, the method such as die trial forming parameter, laser nondestructive measurement, this method solve traditional diaphragm and produce the low problem of qualification rate.
The present invention is to realize the precision form of valve rupture disc by the following method: comprises the steps:
1) raw material screening: material elongation percentage, tensile strength should reach corresponding requirement；
2) blanking screening: according to indentation mould, be sized shearing blanking；
3) die trial indentation: again membrane surface quality, material thickness are screened after blanking, and by sequence number numbering, packaging, state of hydraulic machine should be confirmed before pressure testing, mould closure should be observed during pressure testing, whether have metal fillings to be confirmed, record pressing speed, pressing pressure, dwell time, money advanced for somebody to be paid back later thickness parameter；
4) die trial blanking: adopt blanking die to be punched External Shape after indentation, and be confirmed whether have aluminium skimmings etc. to produce, the important parameter such as record blanking pressure, dwell time；
5) width of nick measurement and bulge test: using laser nondestructive measurement instrument, width of nick being measured, and adjust pad thickness, after indentation thickness meets requirement, carry out bulge test, if suppress to be unsatisfactory for requiring, according to deviation situation, indentation pressure being adjusted；
6) batch products produce: formally produce product by die trial recording parameterses；
7) sampling examination: the product groups of samples of extraction 30% is high and low, Pressure of Ambient Temperature verification experimental verification.
Compared with prior art, present invention key innovation is to suppress the key characteristic of pressure according to diaphragm, required by raw material screening, die trial process is combined using laser nondestructive measurement and bulge test and fast and accurately determines forming parameter, the batch concordance producing guarantee important parameter and die trial parameter, verified finally by sampling test, the method effectively increases rupture disc and produces qualification rate, has important engineering application value.
Brief description
Fig. 1 is the typical pressure diaphragm figure of the embodiment of the present invention；
Fig. 2 is the a-a diagram of Fig. 1；
Fig. 3 is the original plate figure of the embodiment of the present invention；
Fig. 4 is 1 diaphragm sheet material figure after the shearing blanking of the embodiment of the present invention；
Fig. 5 is that the indentation of the embodiment of the present invention shapes (wherein 1 is adjustment cushion block)；
Fig. 6 is the punching diaphragm profile of the embodiment of the present invention；
Fig. 7 is the laser nondestructive measurement diaphragm width of nick of the embodiment of the present invention；
Fig. 8 is the bulge test figure of the embodiment of the present invention；
Fig. 9 is the accurate forming method flow chart of valve rupture disc of the present invention.
Specific embodiment
The present invention, based on valve rupture disc key characteristic, devises the methods such as corresponding raw material screening, die trial forming parameter, laser NDT, solves the problems, such as rupture disc qualification rate.Its step is as follows: the 1) protection of material surface quality; because whether diaphragm width of nick, gas leakage etc. have scuffing, corrosion etc. to have strict demand on raw material surface; therefore raw material must be screened, in forming process, the raw material qualified to screening is protected.2) material property, the material property of every batch products must is fulfilled for certain technical specification.3), before every batch produces, pad thickness, forming pressure etc. need to carry out die trial determination as key index, and the method being combined using laser nondestructive measurement and bulge test can quickly, accurately determine parameter value.4) formal production process need to keep all parameters and die trial to determine the concordance of parameter.5) by sampling no less than 30% packet is high and low, Pressure of Ambient Temperature verification experimental verification product is qualified.
Specific embodiment as shown in Fig. 1 ~ Fig. 9, the preferred embodiment of the present invention provide valve rupture disc accurate forming method, comprise the steps:
1) raw material screening: σ selected by fine aluminiumb=(79～85) mpa, elongation percentage δ are more than 28%, plate surface should no salt made from earth containing a comparatively high percentage of sodium chloride trace, crackle, corrosion pit, peeling metal and nonmetallic press-in thing, surface is not allow for pinaster shape decorative pattern, bubble and scuffing and impression；
2) blanking screening: whole 1200mm × 1200mm sheet material rejects the surplus of surrounding 100mm not as product material, by 60 × 60 shearing blankings, diaphragm anhydrous alcohol cleans up, check blank surface quality, plate surface allows slight scratch and scratches defect, but defect should no substantially sense of touch or depth be not more than 0.05mm.Miking material thickness should meet 1 ± 0.03mm, sealed, numbered with fair and clear soft paper bag；
3) die trial indentation: be not more than 0.02mm with the dial gauge measurement press upper/lower die working region table top depth of parallelism before compacting；During indentation, all limited blocks of mould should be of completely closed；Observe whether compacting membrane surface has aluminium skimmings, again use alcohol washes if any aluminium skimmings reply mould, blown off with compressed air；Indentation speed is 0.5mm/s；Pressure f is 80kn；Dwell time 2s；Pad thickness should be by theoretical closure high computational incision diaphragm 0.9mm.
4) die trial blanking: be not more than 0.05mm with dial gauge measurement press upper/lower die working region table top is parallel before compacting；Observe whether compacting membrane surface has aluminium skimmings, again use alcohol washes if any aluminium skimmings reply mould, blown off with compressed air；Blanking pressure 30kn；Dwell time 1s.
5) width of nick measurement and bulge test: width of nick is measured using laser nondestructive measurement instrument, if width of nick reaches 0.01mm with the difference of 0.08mm, then adjustment pad thickness carries out die trial by step 3 and 4 again, if width of nick reaches 0.08mm, carries out room temperature bulge test.If bulge test pressure value is unsatisfactory for design objective, indentation pressure is finely tuned with each 5kn power, suppressing buffer brake more low then indentation pressure should be less, otherwise indentation pressure is bigger.When reversely suppressing pressure and reaching between 0.95-1.0mp, then complete die trial, record relevant parameter.
6) batch products produce: by the indentation speed of record, pressure, dwell time, pad thickness, blanking pressure, the dwell time, starts formal product and produces, should observe during production and have or not metal fillings generation, every 10 blow down mould once with alcohol washes and compressed air.
7) sampling examination: batch products produce and complete, then inspect each 10% quantity diaphragm by random samples, diaphragm is loaded bulge test frock, empirically temperature is after 2 hours, carry out 40 DEG C of high temperature, room temperature, -40 degrees Celsius of low temperature bulge tests, be satisfied by design objective, then this batch products completes to produce.
In the present invention, because membrane surface prescription is strict, therefore whole operation process contacts diaphragm after being both needed to wear the first set of clean calico in addition to cleaning diaphragm, and batch products production process should strictly monitor hydraulic press, mold work state it is ensured that homogeneity of product.
Above the specific embodiment of the present invention is described.It is to be appreciated that the invention is not limited in above-mentioned particular implementation, those skilled in the art can make various modifications or modification within the scope of the claims, and this has no effect on the flesh and blood of the present invention.
Claims (8)
1. a kind of accurate forming method of valve rupture disc is it is characterised in that comprise the steps:
1) raw material screening: material elongation percentage, tensile strength should reach corresponding requirement；
2) blanking screening: according to indentation mould, be sized shearing blanking；
3) die trial indentation: again membrane surface quality, material thickness are screened after blanking, and by sequence number numbering, packaging, state of hydraulic machine should be confirmed before pressure testing, mould closure should be observed during pressure testing, whether have metal fillings to be confirmed, record pressing speed, pressing pressure, dwell time, money advanced for somebody to be paid back later thickness parameter；
4) die trial blanking: adopt blanking die to be punched External Shape after indentation, and be confirmed whether have aluminium skimmings to produce, record important parameter；
5) width of nick measurement and bulge test: using laser nondestructive measurement instrument, width of nick being measured, and adjust pad thickness, after indentation thickness meets requirement, carry out bulge test, if suppress to be unsatisfactory for requiring, according to deviation situation, indentation pressure being adjusted；
6) batch products produce: formally produce product by die trial recording parameterses；
7) sampling examination: the product groups of samples of extraction 30% is high and low, Pressure of Ambient Temperature verification experimental verification.
2. valve according to claim 1 rupture aluminium film piece accurate forming method it is characterised in that: in described step 1), σ selected by fine aluminiumb=79～85mpa, elongation percentage δ are more than 28%, plate surface should no salt made from earth containing a comparatively high percentage of sodium chloride trace, crackle, corrosion pit, peeling metal and nonmetallic press-in thing, surface is not allow for pinaster shape decorative pattern, bubble and scuffing and impression.
3. valve according to claim 1 ruptures aluminium film piece accurate forming method, it is characterized in that: described step 2) in, whole material rejects the surplus of surrounding 100mm not as product material, by 60 × 60 shearing blankings, diaphragm anhydrous alcohol cleans up, check blank surface quality, plate surface allows slight scratch and scratches defect, but defect should no obvious sense of touch or depth≤0.05mm；Miking material thickness should meet 1 ± 0.03mm, sealed, numbered with fair and clear soft paper bag.
4. valve according to claim 1 rupture aluminium film piece accurate forming method it is characterised in that: in described step 3), with the dial gauge measurement press upper/lower die working region table top depth of parallelism≤0.02mm before compacting；During indentation, all limited blocks of mould should be of completely closed；Observe whether compacting membrane surface has aluminium skimmings, again use alcohol washes if any aluminium skimmings reply mould, blown off with compressed air；Indentation speed is 0.5mm/s；Pressure f is 80kn；Dwell time 2s；Pad thickness should be by theoretical closure high computational incision diaphragm 0.9mm.
5. valve according to claim 1 rupture aluminium film piece accurate forming method it is characterised in that: in described step 4), before compacting with dial gauge measurement press upper/lower die working region table top parallel≤0.05mm；Observe whether compacting membrane surface has aluminium skimmings, again use alcohol washes if any aluminium skimmings reply mould, blown off with compressed air；Blanking pressure 30kn；Dwell time 1s.
6. valve according to claim 1 ruptures aluminium film piece accurate forming method, it is characterized in that: in described step 5), using laser nondestructive measurement instrument, width of nick is measured, if the difference of width of nick h and 0.08mm reaches 0.01mm, then adjustment pad thickness carries out die trial by step 3 and 4 again, if width of nick reaches 0.08mm, carry out room temperature bulge test；If bulge test pressure value is unsatisfactory for design objective, indentation pressure is finely tuned with each 5kn power, suppressing buffer brake more low then indentation pressure should be less, otherwise indentation pressure is bigger；When reversely suppressing pressure and reaching between 0.95-1.0mp, then complete die trial, record relevant parameter.
7. valve according to claim 1 ruptures aluminium film piece accurate forming method, it is characterized in that: in described step 6), by the indentation speed of record, pressure, dwell time, pad thickness, blanking pressure, dwell time, start formal product to produce, should observe during production and have or not metal fillings generation, every 10 blow down mould once with alcohol washes and compressed air.
8. valve according to claim 1 ruptures aluminium film piece accurate forming method, it is characterized in that: in described step 7), batch products produce and complete, then inspect each 10% quantity diaphragm by random samples, diaphragm is loaded bulge test frock, empirically temperature, after 2 hours, carries out 40 DEG C of high temperature, room temperature, -40 degrees Celsius of low temperature bulge tests, it is satisfied by design objective, then this batch products completes to produce.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510425889.2A CN106363071B (en) | 2015-07-20 | 2015-07-20 | A kind of accurate forming method of valve rupture disc |
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| CN201510425889.2A CN106363071B (en) | 2015-07-20 | 2015-07-20 | A kind of accurate forming method of valve rupture disc |
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| CN106363071A true CN106363071A (en) | 2017-02-01 |
| CN106363071B CN106363071B (en) | 2019-07-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113857684A (en) * | 2021-11-01 | 2021-12-31 | 西安航天动力研究所 | Picosecond laser etching processing method for omega-shaped nicks of metal membrane |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101522332A (en) * | 2006-10-04 | 2009-09-02 | 本田技研工业株式会社 | Shaping condition deciding method, and shaping condition deciding system |
| CN103846340A (en) * | 2012-11-29 | 2014-06-11 | 上海航天设备制造总厂 | Precision forming die group for valve pressure diaphragm and application method thereof |
| CN205085227U (en) * | 2015-11-04 | 2016-03-16 | 重庆戴卡捷力轮毂制造有限公司 | Heavy gauge aluminium alloy plate material blanking mould of little deformation |
| CN205519133U (en) * | 2016-01-29 | 2016-08-31 | 温岭市职业中等专业学校 | Car door plant indentation device |
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2015
- 2015-07-20 CN CN201510425889.2A patent/CN106363071B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101522332A (en) * | 2006-10-04 | 2009-09-02 | 本田技研工业株式会社 | Shaping condition deciding method, and shaping condition deciding system |
| CN103846340A (en) * | 2012-11-29 | 2014-06-11 | 上海航天设备制造总厂 | Precision forming die group for valve pressure diaphragm and application method thereof |
| CN205085227U (en) * | 2015-11-04 | 2016-03-16 | 重庆戴卡捷力轮毂制造有限公司 | Heavy gauge aluminium alloy plate material blanking mould of little deformation |
| CN205519133U (en) * | 2016-01-29 | 2016-08-31 | 温岭市职业中等专业学校 | Car door plant indentation device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113857684A (en) * | 2021-11-01 | 2021-12-31 | 西安航天动力研究所 | Picosecond laser etching processing method for omega-shaped nicks of metal membrane |
| CN113857684B (en) * | 2021-11-01 | 2024-03-01 | 西安航天动力研究所 | Picosecond laser etching processing method for omega-shaped notch of metal diaphragm |
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