CN102896225A - Self-centering seal head stamping die, process and seal head turning alignment tool - Google Patents
Self-centering seal head stamping die, process and seal head turning alignment tool Download PDFInfo
- Publication number
- CN102896225A CN102896225A CN2012103844629A CN201210384462A CN102896225A CN 102896225 A CN102896225 A CN 102896225A CN 2012103844629 A CN2012103844629 A CN 2012103844629A CN 201210384462 A CN201210384462 A CN 201210384462A CN 102896225 A CN102896225 A CN 102896225A
- Authority
- CN
- China
- Prior art keywords
- end socket
- seal head
- centering
- center
- collet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Punching Or Piercing (AREA)
Abstract
The invention discloses a self-centering seal head stamping die, a seal head stamping process and a seal head turning alignment tool. A punch mark is formed at the center point of a seal head, and the seal head is aligned by taking the punch mark as a reference during machining, so that the problem that the quality of a weld joint and the internal stress distribution of a container are influenced because large and small openings of the turned seal head are incompletely coaxial and have a large roundness difference. A cushion plate (12), a cover plate (11), a bottom support (9) and a center (14) are added on the basis of the conventional seal head stamping die; the cushion plate (12) is in threaded connection with a female die base (8) and bears the weight of the cover plate (11) and the bottom support (9); a hole is formed in the dead center of the bottom support (9) and used for storing the center (14); and a center hole is formed in the surface of the seal head when a male die (2) is attached to the bottom support (9) during stamping. By the self-centering seal head stamping die, the seal head stamping process and the seal head turning alignment tool, manual alignment operation errors are reduced, the requirement on skills of workers is obviously reduced, the production efficiency of a product is improved, and the quality of the product is greatly improved.
Description
Technical field
The present invention relates to a kind of sealing head processing mold and processing technology thereof, be specifically related to a kind of diel and head pressing, end socket turning centering frock.
Background technology
At present, domestic end socket turning processing centering is generally take the end socket straightway as benchmark, and employing vertical lathe four paws tightens the straightway of the end socket after the punching press, and then large mouthful of turning end socket turns over end socket take the large mouthful of method as benchmark turning end socket osculum.So just have the center of vertical lathe and the axis runout of end socket, the end socket size openings place after the turning processing is not exclusively coaxial, the poor shortcoming such as large of large osculum opening part circularity.Thereby cause end socket and joint, end socket and cylinder joint gap inhomogeneous, the welding seam misalignment amount is larger, thereby affects weldquality, affects the hidden danger of quality such as internal tank stress distribution.Therefore developed this cover self-centering head pressing mould, head pressing technique and end socket turning process have been improved, utilize this cover self-centering head pressing mould and improve after head pressing, the large osculum axiality of end socket of turning process production, circularity obviously improve, effect is good.
Summary of the invention
Technical problem to be solved by this invention: a kind of head pressing mould is provided, in manufacturing procedure, fix the centering benchmark for end socket turning manufacturing procedure, solve the large osculum circularity of turning rear head poor, large osculum disalignment affects the hidden danger of quality of welding quality and internal tank stress distribution.
The technical solution adopted in the present invention:
A kind of end socket self-centering diel comprises formpiston, former, former seat and blank holder.Increase backing plate, cover plate, collet, top on the basis of untouched stamping die.Backing plate is connected with screw with the former seat, bears the weight of cover plate, collet, is convenient to transportation, and the vertical lathe push rod passes from the hole during punching press of backing plate center drilling, supports on the cover board by cover plate collet jack-up, finishes the demoulding thereby make end socket be ejected former.Cover plate is connected with the collet screw, moves up and down with collet, bears the ejecting force of push rod, and the transmission ejecting force ejects former to collet with end socket and finishes the demoulding.The perforate of collet center is deposited top, when mould is pasted in punching press the end socket surface is extruded a center hole, the center centering benchmark when described center hole is used for end socket turning.
Screwed hole is arranged on top, be screwed in the screwed hole top taking-up with corresponding screw after the punching press.
Collet adopts steel-casting.
Top employing high strength steel, Quenching Treatment hardness number are HRC40～44.This self-centering diel can automatic capturing end socket central point, and gets the sample dotting punch at the end socket central point.Turning adds carries out centering processing end socket man-hour take this sample dotting punch as benchmark, make the end socket size openings place after the machining fully coaxial, and really be on the axis of end socket.
The present invention also provides a kind of head pressing technique that adopts above-mentioned self-centering diel, comprises step:
1, blanking, with the circle shearing machine that plate cutting is circular;
2, punching press I is placed on circular plate on the former, is about to head pressing under the formpiston to certain depth (such as 200mm);
3, annealing, the semi-finished product end socket carries out annealing in process;
Whether 4, punching press II is stamped into workpiece the depth dimensions of requirement, and formpiston and collet are thoroughly fitted when making head pressing, toply ejects an obvious center hole at the end socket center, and relevant each size of end socket is detected, check simultaneously center hole clear.
The present invention improves former method with end socket overlap centering thoroughly, and a kind of end socket turning centering frock is provided again.This frock comprises inner pressure ring, outer press ring, guide collar, jack, centering parts.Guide collar is placed on vertical lathe platform center, its center has aperture, place the centering parts in this aperture, outer press ring is inboard fits with the guide collar external diameter, can slide up and down in guide collar, four jack of symmetrical placement under the outer press ring, inner pressure ring are placed on the inboard of end socket to be play a part to compress end socket, and end socket can vibration during the large opening of turning end socket.During work, end socket aligns with the centering parts with the overhead traveling crane center hole of slinging, and adjusts four jack and makes outer press ring stretching end socket outer wall, measures the outer press ring upper surface on same level, and difference in height is placed on side compression end socket in the end socket less than 0.1mm with inner pressure ring.The large mouth of turning end socket, the end socket that overturns is placed on large mouth on the platform, uses the rear turning osculum of corresponding device compression take large mouth as benchmark.
Described centering parts can adopt top in the aforementioned end socket self-centering diel.
Distinguishing feature of the present invention is that end socket turning benchmark is by the diel automatic capturing, overcome the error that artificial centering and clamping end socket straightway place centering cause, large end opening and small end opening axiality are high after the turning processing, and with the end socket dead in line, satisfy the requirement of follow-up erection welding operation fully.
Beneficial effect of the present invention: reduced the error of artificial centering operation, the craftsmanship is required that obvious reduction has been arranged, improved production efficient, increased substantially product quality.
Description of drawings
Fig. 1 self-centering head pressing mould structure schematic diagram comprises transportation pin 1, formpiston 2, transition ring 3, flanging ring support 4, soket head cap screw I5, blank holder 6, former 7, former seat 8, collet 9, soket head cap screw II 10A, soket head cap screw III 10B, cover plate 11, backing plate 12, alignment pin 13, top 14.
Fig. 2 end socket turning centering tool structure schematic diagram comprises inner pressure ring 15, outer press ring 16, guide collar 17, jack 18, centering parts 19.
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples:
A kind of self-centering head pressing mould has increased backing plate 12, cover plate 11, collet 9, top 14 on the basis of untouched stamping die as shown in Figure 1.Backing plate 12 is connected with former seat 8 by soket head cap screw III 10B, bears the weight of cover plate 11, collet 9, convenient lifting in the transportation.The vertical lathe push rod passes from the hole during backing plate 12 center drilling punching press, is supported on the cover plate 11, with collet 9 jack-up, thereby makes end socket be ejected former 7, finishes the demoulding.Cover plate 11 is connected with collet 9 by soket head cap screw II 10A, moves up and down with collet 9, and the transmission ejecting force ejects former to collet 9 with end socket and finishes the demoulding.Collet 9 adopts steel-casting, and collet 9 center perforates deposit top 14.Top 14 adopt high strength steels, and the Quenching Treatment hardness number is HRC40～44, are placed in the hole of the center of collet 9 opening, and when mould is pasted in punching press the end socket surface are extruded a center hole.
As shown in Figure 2, a kind of end socket turning centering frock comprises inner pressure ring 15, outer press ring 16, guide collar 17, jack 18, centering parts 19.Guide collar 17 is placed on vertical lathe platform center, and guide collar 17 centers have aperture, places centering parts 19 in the described aperture.Outer press ring 16 inboard and guide collar 17 external diameters applyings can slide up and down in guide collar 17, four jack 18 of 16 times symmetrical placements of outer press ring.Inner pressure ring 15 is placed on the inboard of end socket to be play a part to compress end socket, and end socket can vibration during the large opening of turning end socket.During work, end socket aligns with centering parts 19 with the overhead traveling crane center hole of slinging, and adjusts four jack 18 and makes outer press ring 16 stretching end socket outer walls, measures outer press ring 16 upper surfaces on same level, difference in height is placed on side compression end socket in the end socket less than 0.1mm with inner pressure ring 15.The large mouth of turning end socket, the end socket that overturns is placed on large mouth on the platform, uses the rear turning osculum of corresponding device compression take large mouth as benchmark.
Adopt above-mentioned self-centering head pressing mould punching end socket and carry out the concrete steps of turning as follows:
Elder generation's blanking, with the circle shearing machine that plate cutting is circular; Carry out punching press I, circular plate is placed on the former, be about to head pressing under the formpiston to certain depth (such as 200mm); With after annealing, the semi-finished product end socket carries out annealing in process; Carry out at last punching press II operation.When carrying out punching press II operation, when formpiston 2 comes downwards to former 7 endoporus, formpiston 1 and former 7 automatic capturings, former seat 8 has very high axiality with former 7 by alignment pin 13 and a straight mouthful centering, collet 9 is positioned at former seat 8 and has high axiality with former seat 8, collet 9 has high axiality with top 14 of its inside, and top like this 14 are located on the axis of former 7, formpiston 2, former seat 8, collet 9, just is ejected a center hole on the end socket when formpiston 2 continues descending and collet 9 is fitted.This center hole can be used as the benchmark of turning processing fully, turning adds man-hour centering parts 19 and aligns with center hole on the end socket, adjust four jack 18 and make outer press ring 16 stretching end socket outer walls, measure outer press ring 16 on same level, difference in height is less than 0.1mm, inner pressure ring 15 is placed on side compression end socket in the end socket, the large opening of turning end socket, and just the axis with end socket is vertical for large opening.
Above-mentioned is the special description that the present invention is made.For a person skilled in the art, any improvement that does not break away from spirit of the present invention reaches to substitute and all falls within the scope of protection of the present invention.For example, the connected mode between the structure member of the present invention is replaced, all belong to protection scope of the present invention.Protection scope of the present invention is limited with its claim.
Claims (7)
1. self-centering head pressing mould, comprise formpiston (2), former (7), former seat (8) and blank holder (6), it is characterized in that: on the basis of untouched stamping die, increase backing plate (12), cover plate (11), collet (9), top (14); Backing plate (12) is threaded with former seat (8), bear the weight of cover plate (11), collet (9), backing plate (12) center drilling, the vertical lathe push rod passes from the hole during punching press, be supported on cover plate (11) upper with collet (9) jack-up, thereby make end socket be ejected former (7), finish the demoulding; Cover plate (11) is threaded with collet (9), moves up and down with collet (9), transmits ejecting force to collet (9); Top (14) are deposited in collet (9) center perforate, when mould is pasted in punching press the end socket surface are extruded a center hole, the center centering benchmark when described center hole is used for end socket turning.
2. mould according to claim 1 is characterized in that: on top (14) screwed hole is arranged.
3. mould according to claim 1 and 2 is characterized in that: collet (9) employing steel-casting.
4. mould according to claim 1 and 2 is characterized in that: top (14) adopt high strength steel, and the Quenching Treatment hardness number is HRC40～44.
5. the employing head pressing technique of arbitrary described mould according to claim 1-4 comprises the steps:
1) blanking
With the circle shearing machine that plate cutting is circular;
2) punching press I
Circular plate is placed on the former (7), is about to head pressing under the formpiston (2) to certain depth;
3) annealing
The semi-finished product end socket that is stamped into certain depth is carried out annealing in process;
4) punching press II
Workpiece is stamped into the depth dimensions of requirement, formpiston when making head pressing (2) is thoroughly fitted with collet (9), whether top (14) eject an obvious center hole at the end socket center, relevant each size of end socket is detected, check simultaneously center hole clear.
6. an end socket turning centering frock is characterized in that: comprise inner pressure ring (15), outer press ring (16), guide collar (17), jack (18), centering parts (19); Guide collar (17) is placed on vertical lathe platform center, and guide collar (17) center has aperture, places centering parts (19) in the described aperture; Outer press ring (16) is inboard fits with guide collar (17) external diameter, can slide up and down in guide collar (17) lower symmetrical four jack (18) of placing of outer press ring (16); The inboard that inner pressure ring (15) is placed on end socket plays a part to compress end socket, and end socket can vibration during the large opening of turning end socket; During work, end socket is sling with overhead traveling crane the end socket center hole is alignd with the centering parts, adjusts four jack and makes outer press ring stretching end socket outer wall, measures the outer press ring upper surface on same level, difference in height is placed on side compression end socket in the end socket less than 0.1mm with inner pressure ring.The large mouth of turning end socket, the end socket that overturns is placed on large mouth on the platform, uses the rear turning osculum of corresponding device compression take large mouth as benchmark.
7. centering frock according to claim 6 is characterized in that: top (14) described in described centering parts (19) the employing claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103844629A CN102896225A (en) | 2012-09-25 | 2012-09-25 | Self-centering seal head stamping die, process and seal head turning alignment tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103844629A CN102896225A (en) | 2012-09-25 | 2012-09-25 | Self-centering seal head stamping die, process and seal head turning alignment tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102896225A true CN102896225A (en) | 2013-01-30 |
Family
ID=47568880
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103844629A Pending CN102896225A (en) | 2012-09-25 | 2012-09-25 | Self-centering seal head stamping die, process and seal head turning alignment tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102896225A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108043969A (en) * | 2017-11-10 | 2018-05-18 | 武汉船用机械有限责任公司 | A kind of processing unit (plant) and processing method of gas turbine rectification cover wall |
| CN108180691A (en) * | 2018-02-09 | 2018-06-19 | 新乡学院 | A kind of rhone and its stamping die and Sheet Metal Forming Technology |
| CN109175050A (en) * | 2018-09-29 | 2019-01-11 | 张化机（苏州）重装有限公司 | The pressing tool of nuclear power safety injection tank end socket |
| CN111014489A (en) * | 2019-12-31 | 2020-04-17 | 河南神州精工制造股份有限公司 | High-forming-precision end socket flanging positioning tool and positioning method using same |
| CN113894219A (en) * | 2021-09-30 | 2022-01-07 | 中国航发动力股份有限公司 | Stamping device and stamping method for machining plate with air film hole |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB693958A (en) * | 1950-01-18 | 1953-07-08 | Pierce John B Foundation | Improvement in snap springs |
| SU550198A1 (en) * | 1974-11-27 | 1977-03-15 | Центральное конструкторское бюро нефтеаппаратуры | Stamp for stretching the bottom |
| CN2142763Y (en) * | 1992-12-23 | 1993-09-29 | 王淑义 | Drawing die without mould |
| US6339949B1 (en) * | 1999-07-30 | 2002-01-22 | Tutomu Takamatu | Deep drawing method |
| CN101049621A (en) * | 2007-05-16 | 2007-10-10 | 河南科隆石化装备有限公司 | Spinner |
| CN101157175A (en) * | 2007-11-20 | 2008-04-09 | 中国航天科技集团公司第五研究院第五一○研究所 | A processing method of titanium alloy closing end |
| CN101745811A (en) * | 2009-12-10 | 2010-06-23 | 武汉重工铸锻有限责任公司 | Mechanical processing method of distance-adjusting oar blade root flange and dedicated fixture therefor |
| CN201677193U (en) * | 2010-04-26 | 2010-12-22 | 天津赛瑞机器设备有限公司 | Portable fixture |
| CN101987333A (en) * | 2009-08-07 | 2011-03-23 | 上海重型机器厂有限公司 | Punch forming method for large seal head of pressure vessel of nuclear power equipment |
| CN102161064A (en) * | 2011-01-06 | 2011-08-24 | 新乡中联石化封头锻压有限公司 | Molding die and molding process of thick-wall spherical seal head for hydrogenation reactor |
| CN201940828U (en) * | 2010-11-22 | 2011-08-24 | 国营红阳机械厂 | Clamp for processing large-sized thin-wall taper cylindrical workpiece end face |
| CN102248376A (en) * | 2011-06-28 | 2011-11-23 | 湖北三江航天江北机械工程有限公司 | Machining method of porous thin-wall protective tube with large length-diameter ratio |
| CN102248362A (en) * | 2011-04-30 | 2011-11-23 | 泰安广大化工机械有限公司 | Method for manufacturing end socket of voltage stabilizer for nuclear power |
| CN202087664U (en) * | 2011-05-23 | 2011-12-28 | 吴胜伟 | Hydraulic seal head die |
| CN102319803A (en) * | 2011-08-22 | 2012-01-18 | 亿森（上海）模具有限公司 | A kind of process and mould thereof that draws the flange moulding |
| CN102451918A (en) * | 2010-10-27 | 2012-05-16 | 北京新风机械厂 | Clamping and aligning method for turning cylindrical part and special tool |
| CN202433255U (en) * | 2011-12-22 | 2012-09-12 | 宝山钢铁股份有限公司 | Locating device of test specimen on die |
| CN203197097U (en) * | 2012-09-25 | 2013-09-18 | 内蒙古航天红岗机械有限公司 | Self-centering head punching die |
-
2012
- 2012-09-25 CN CN2012103844629A patent/CN102896225A/en active Pending
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB693958A (en) * | 1950-01-18 | 1953-07-08 | Pierce John B Foundation | Improvement in snap springs |
| SU550198A1 (en) * | 1974-11-27 | 1977-03-15 | Центральное конструкторское бюро нефтеаппаратуры | Stamp for stretching the bottom |
| CN2142763Y (en) * | 1992-12-23 | 1993-09-29 | 王淑义 | Drawing die without mould |
| US6339949B1 (en) * | 1999-07-30 | 2002-01-22 | Tutomu Takamatu | Deep drawing method |
| CN101049621A (en) * | 2007-05-16 | 2007-10-10 | 河南科隆石化装备有限公司 | Spinner |
| CN101157175A (en) * | 2007-11-20 | 2008-04-09 | 中国航天科技集团公司第五研究院第五一○研究所 | A processing method of titanium alloy closing end |
| CN101987333A (en) * | 2009-08-07 | 2011-03-23 | 上海重型机器厂有限公司 | Punch forming method for large seal head of pressure vessel of nuclear power equipment |
| CN101745811A (en) * | 2009-12-10 | 2010-06-23 | 武汉重工铸锻有限责任公司 | Mechanical processing method of distance-adjusting oar blade root flange and dedicated fixture therefor |
| CN201677193U (en) * | 2010-04-26 | 2010-12-22 | 天津赛瑞机器设备有限公司 | Portable fixture |
| CN102451918A (en) * | 2010-10-27 | 2012-05-16 | 北京新风机械厂 | Clamping and aligning method for turning cylindrical part and special tool |
| CN201940828U (en) * | 2010-11-22 | 2011-08-24 | 国营红阳机械厂 | Clamp for processing large-sized thin-wall taper cylindrical workpiece end face |
| CN102161064A (en) * | 2011-01-06 | 2011-08-24 | 新乡中联石化封头锻压有限公司 | Molding die and molding process of thick-wall spherical seal head for hydrogenation reactor |
| CN102248362A (en) * | 2011-04-30 | 2011-11-23 | 泰安广大化工机械有限公司 | Method for manufacturing end socket of voltage stabilizer for nuclear power |
| CN202087664U (en) * | 2011-05-23 | 2011-12-28 | 吴胜伟 | Hydraulic seal head die |
| CN102248376A (en) * | 2011-06-28 | 2011-11-23 | 湖北三江航天江北机械工程有限公司 | Machining method of porous thin-wall protective tube with large length-diameter ratio |
| CN102319803A (en) * | 2011-08-22 | 2012-01-18 | 亿森（上海）模具有限公司 | A kind of process and mould thereof that draws the flange moulding |
| CN202433255U (en) * | 2011-12-22 | 2012-09-12 | 宝山钢铁股份有限公司 | Locating device of test specimen on die |
| CN203197097U (en) * | 2012-09-25 | 2013-09-18 | 内蒙古航天红岗机械有限公司 | Self-centering head punching die |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108043969A (en) * | 2017-11-10 | 2018-05-18 | 武汉船用机械有限责任公司 | A kind of processing unit (plant) and processing method of gas turbine rectification cover wall |
| CN108180691A (en) * | 2018-02-09 | 2018-06-19 | 新乡学院 | A kind of rhone and its stamping die and Sheet Metal Forming Technology |
| CN109175050A (en) * | 2018-09-29 | 2019-01-11 | 张化机（苏州）重装有限公司 | The pressing tool of nuclear power safety injection tank end socket |
| CN111014489A (en) * | 2019-12-31 | 2020-04-17 | 河南神州精工制造股份有限公司 | High-forming-precision end socket flanging positioning tool and positioning method using same |
| CN113894219A (en) * | 2021-09-30 | 2022-01-07 | 中国航发动力股份有限公司 | Stamping device and stamping method for machining plate with air film hole |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102896225A (en) | Self-centering seal head stamping die, process and seal head turning alignment tool | |
| CN201012375Y (en) | Eyelet punching flanging composite mold | |
| CN104128510A (en) | Punching, trimming and correcting composite die | |
| CN105251867A (en) | Rear axle locking gasket die capable of punching 24 holes in two steps and machining process of die | |
| CN203197097U (en) | Self-centering head punching die | |
| CN203853457U (en) | Material ejection type material falling punching composite mold | |
| CN103084488A (en) | Two-way blank pressing drawing and coining integration die | |
| CN213451964U (en) | Blank before three-piece type ball valve cover forging is rolled | |
| CN205147022U (en) | Rear axle locking packing ring dashes 24 casement utensils for two steps | |
| CN203236263U (en) | Sealing head turning and alignment tool | |
| CN205887842U (en) | Automobile component stamping die | |
| CN101015849B (en) | Tyre die forging-demoulding device | |
| CN112059088B (en) | Multi-station die holder for punch press | |
| CN210877129U (en) | One-time simultaneous blanking-punching manufacturing two-piece composite die for automobile rear axle refueling plug seat | |
| CN201988629U (en) | Forming mould of thick-wall spherical seal head for hydrogenation reactor | |
| CN105251897B (en) | The flaring die and its processing technology of a kind of automobile front axle sleeve pipe two pieces two ends enlarging simultaneously | |
| CN208555690U (en) | A kind of disjunctor shaping dies | |
| CN213002438U (en) | Multi-station die holder for punch press | |
| CN201684833U (en) | Mould for punching eccentric hole-flanging on fuel dispensing pipe | |
| CN104827330A (en) | Automated glass die machining, clamping and positioning auxiliary device | |
| CN103302182A (en) | Sizing die structure for holder | |
| CN205043002U (en) | Die for turning -up edge | |
| CN103786046A (en) | Turning tool structure for thin-walled work-piece | |
| CN104475454B (en) | For interior frock of establishing high annular boss ring forging to forge | |
| CN103056229B (en) | A kind of for die for stamping large-diameter small-height bushes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130130 |