CN101875103A - Manufacture method of large 90-degree double-bearing T shaped nodular cast iron bent pipe - Google Patents
Manufacture method of large 90-degree double-bearing T shaped nodular cast iron bent pipe Download PDFInfo
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- CN101875103A CN101875103A CN2009102373706A CN200910237370A CN101875103A CN 101875103 A CN101875103 A CN 101875103A CN 2009102373706 A CN2009102373706 A CN 2009102373706A CN 200910237370 A CN200910237370 A CN 200910237370A CN 101875103 A CN101875103 A CN 101875103A
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Abstract
The invention provides a manufacture method of a large 90-degree double-bearing T shaped nodular cast iron bent pipe and belongs to the technical field of bent pipe manufacture. The manufacture method comprises the steps of: die making, molding flask making, core box making, dovetail groove fixing device making, core iron making, typecasting core box making, application of water glass organic fat self-hardening sand, quality test on a manufactured pressure test equipment product, lining coating and preservation. The manufacture method solves the technical problems of difficult size control and difficult equipment manufacture due to no use of process holes, tools and dies in the manufacture process, can be used for manufacturing large 90 degree bent pipes and has the advantages of simple manufacture process, high product quality and high comprehensive yield.
Description
Technical field
The invention belongs to the manufacturing technology field of bend pipe, particularly relate to a kind of manufacture method of large 90-degree double-bearing T shaped nodular cast iron bend pipe.
Background technology
DN1600 * 90 a ° double-bearing T shaped nodular cast iron bent pipe is and the matching used pipe fitting of pipe, product is in strict accordance with GB13295-2003 (standard that my company works out) and ISO2531-1998 standard, satisfying under user's contract requirement situation, the workmanship standard is not less than national standard and produces.The nodular cast iron pipe fittings of company is not only supplied Taiyuan and is drawn domestic large-scale water delivery engineerings such as yellow engineering, Wuhan row's stain engineering, 78 countries and regions such as also large quantities of outlet Spain, Cyprus, Cambodia, Kuwait, Bangladesh, Syria, Egypt.DN1600 * 90 ° double-bearing T shaped nodular cast iron bent pipe, nominal dimension are DN1600, and interface type is a T type bellmouth, and castings material is 90 ° of spheroidal graphite cast-iron, and the foundry goods kind is 90 ° of bend pipes, and it plays junction line, and make pipeline that 90 ° deflection take place.This pipe fitting interface shape and size are that my company oneself designs, and use in international and domestic multinomial engineering, and the pipeline operation is normal.The wall thickness of bend pipe calculates according to formula in the ISO2531-1998 standard, and e=K (0.5+0.001DN) is in the formula: e-standard wall thickness, mm; The DN-nominal diameter, mm; K-wall thickness classification coefficient is got a series of integers: 7,8,9,10,11,12 ..., K gets 12 in the bend pipe, and calculating wall thickness e is 25.2mm.Bend pipe negative common difference thickness calculates-3.9mm according to formula [(2.3+0.001DN)] in the ISO2531-1998 standard.Bend pipe weight is according to the BS4772:1989 standard design, and Lu is 1630mm, and calculated weight is 3683kg; According to GB13295-2003 (this standard is that emerging cast tube group writes) standard design, Lu is 1290mm, and calculated weight is 2564kg, makes DN1600 * 90 ° double-bearing T shaped nodular cast iron bent pipe size according to user's needs, and this bend pipe is seen shown in Figure 1.General enterprise produces 90 ° of bend pipe specifications below DN1200, and specification surpasses more than the DN1200, is subjected to product technology, moulding moulds of industrial equipment, suppresses the restriction of conditions such as equipment and product comprehensive qualified rate, and the manufacturing of large 90-degree bend pipe is difficulty more.
Summary of the invention
The object of the present invention is to provide a kind of manufacture method of large 90-degree double-bearing T shaped nodular cast iron bend pipe, overcome manufacture craft without problems such as the bad control of fabrication hole, frock and die size, equipment making difficulties, can make the large 90-degree bend pipe, and manufacturing process is fairly simple, good product quality, the comprehensive qualified rate height.
The present invention solves the technical scheme that its technical problem takes:
1, makes mould: die cavity epimorph, intermediate die are fixed on the base plate mould; The k type that is shaped as, T type or socket iron sample or the wooden model sample of external form mould, intermediate die be shaped as wooden model, cement-like or iron sample, the base plate mould be shaped as wooden model or swage sample.
2, make sandbox: go up drag box adopt mold thickness 80-140mm with the molding sand case, last nowel size is respectively 3450mm * 3450mm * 1120mm, sandbox is welded by the steel plate of 20-30mm, last drag box is shown in 10 among Fig. 3.Assurance is controlled at 60-100mm with the mold thickness between molding sand case and the frock, sand using amount and assurance molding sand integral intensity when reducing moulding.
3, make core box: core box adopts steel construction base and magnesium iron material (QT420-5) half module basic structure design, and hand screw device is adopted in the folding of half module, and alignment pin is adopted in the location of half module.Adopt the core box of furan resin-sand technology and suitable dimension to make bell socket sand core, the bellmouth size for connection directly casts out, and need not process, and the bell socket sand core that core box is made is seen shown in 2 among Fig. 3;
4, make the dovetail groove fixture: fixture is that the Q235 steel plate of 100mm is made by thickness, fixture is made two covers, fixed form between fixture and the core iron adopts dovetail groove to fix, guarantee that the rigging error between fixture and the core iron is 1-3mm, concrete assembling connects to be seen among Fig. 3 shown in 6;
5, make core iron: adopt mold thickness 60-120mm with core iron, core iron is that the Q235 steel plate of 15-30mm forms according to the weldering of figure paper roll by thickness, guarantee core iron with type, could guarantee the mold thickness uniformity on core iron both sides, offer the venthole of Φ 10mm on the core iron, be made into 90 ° of toroidals, concrete shape is seen shown in 4 among Fig. 3.
6, make the typefounding core box: the carpenter makes with core box, the word of carving with rubber is put into core box made with the type resin sand core, puts into the die cavity moulding again, and it is beautiful, attractive in appearance and generous to cast out typefounding;
7, utilization waterglass alicyclic organic self-hardening sand (modified water glass: alicyclic organic: sand=3.0-4.0: 0.5-0.7: 100) explained hereafter DN1600 * 90 ° double-bearing T shaped nodular cast iron bent pipe sand bond height, the bend pipe presentation quality is good;
8, pressure testing equipment (production finish after quality inspection) is made and utilization: take different pressure testing modes at different requirements, the small quantities of pressure rating requirement of first single-piece is low, and production efficiency is fast, sees Fig. 4; The first in batches big pressure rating requires high, and production efficiency is fast, sees Fig. 5; Every bend pipe test pressure 1.2Mpa, the dwell time is 1 minute (ISO2531 standard-required test pressure 1.0MPa, the dwell time is 30 seconds), concrete pressure testing process is seen Figure 4 and 5;
9, be coated with lining and health.
The present invention has following advantage: 1, make 90 ° of nodular cast iron bent pipes that nominal dimension surpasses DN1400; 2, grasped utilization waterglass alicyclic organic self-hardening sand explained hereafter DN1600 * 90 ° of double-bearing T shaped nodular cast iron bent pipe sand bond height, the bend pipe presentation quality is good; 3, employing with the molding sand case with moulding of core core iron and system intermediate core, reduces mold thickness and reduces production costs up and down; 4, adopt the fixing middle core iron of dovetail groove fixture, convenient disassembly is enhanced productivity, and guarantees that intermediate core is not floating, bend pipe wall thickness uniformity; 5, take different pressure testing modes at different requirements, the small quantities of pressure rating of first single-piece requires low, and production efficiency is fast; The first in batches big pressure rating requires high, and production efficiency is fast; 6, adopt the core box of furan resin-sand technology and suitable dimension to make bell socket sand core, the bellmouth size for connection directly casts out, and need not process; 7, employing reasonably is coated with the lining craft, is coated with lining thickness and guarantees technological requirement, and it is solid to be coated with lining, not from rousing and coming off; 8, adopt rubber to carve characters to put into core box and make with the molding sand core, put into die cavity again, it is beautiful, attractive in appearance and generous to cast out typefounding.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is DN1600 of the present invention * 90 ° double-bearing T shaped nodular cast iron bent pipe schematic diagrames.
Fig. 2 is a production heavy caliber nodular cast iron pipe fittings process chart of the present invention.
Fig. 3 is DN1600 of the present invention * 90 ° double-bearing T shaped nodular cast iron bent pipe mould assembling schematic diagrames.Wherein, 5,2 of waterglass organic ester self-hardening sands 1 in the sandbox, bellmouth resin sand 2, core iron self-hardening sand 3, core iron 4, insulated feeder, 7,2 of dovetail groove fixture 6, running gate systems, the permanent core iron 8 of bellmouth, die cavity form bend pipe 9, with molding sand case 10.
Fig. 4 is a heavy caliber nodular cast iron pipe fittings pressure testing schematic diagram of the present invention.Wherein, drift 11, pressure testing lid 12, water-in flange 13, the flange 14 of giving vent to anger, adapter 15, adpting flange 16, hose 17, hydraulic press 18, bend pipe 19.
Fig. 5 is a heavy caliber nodular cast iron pipe fittings pressure testing schematic diagram of the present invention.Wherein, pillar 20, pressing plate 21, parallels 22, bend pipe 19, structure for pressure test 23, platform 24, hydraulic system 25.
The specific embodiment
The present invention includes the following step:
1, makes mould: die cavity epimorph, intermediate die are fixed on the base plate mould; The T type that is shaped as of external form mould, the shape cement-like of intermediate die, the base plate mould be shaped as the swage sample.
2, make sandbox: go up drag box and adopt with the molding sand case, last nowel size is respectively 3450mm * 3450mm * 1120mm, and sandbox is welded by the steel plate of 20mm, and last drag box is shown in 10 among Fig. 3.Last drag box weight respectively is 3 tons, guarantees to be controlled at 80mm with the mold thickness between molding sand case and the frock sand using amount and assurance molding sand integral intensity when reducing moulding.
3, make core box: core box adopts steel construction base and magnesium iron material (QT420-5) half module basic structure design, and hand screw device is adopted in the folding of half module, and alignment pin is adopted in the location of half module.Adopt the core box of furan resin-sand technology and suitable dimension to make bell socket sand core, the bellmouth size for connection directly casts out, and need not process, and the bell socket sand core that core box is made is seen shown in 2 among Fig. 3;
4, make the dovetail groove fixture: fixture is that the Q235 steel plate of 100mm is made by thickness, fixture is made two covers, fixed form between fixture and the core iron adopts dovetail groove to fix, and guarantees that the assembling core iron does not float, and plays the fixedly effect of core iron.The dovetail groove of front end and core iron bearing is made very crucial, it guarantees that the rigging error between fixture and the core iron is 2mm, making overproof needs adjusts repeatedly, also to guarantee enough intensity herein, through using repeatedly, defectives such as distortion, distortion and fracture can not occur, otherwise be difficult for assembling, even easily go wrong after assembling yet; The fit-up gap will be provided with rationally, and excesssive gap slides easily, and core iron is easily floating; The gap is little, extremely difficult assembling, and installation time is long, and behind the casting complete, dismounting need expend the plenty of time.Concrete assembling connects sees that the fixture of dovetail groove shown in 6 among Fig. 3 is connected with dovetail groove between the middle core iron.
5, make core iron: adopt mold thickness 80mm with the core iron core iron, core iron is that the Q235 steel plate of 20mm forms according to the weldering of figure paper roll by thickness, guarantee core iron with type, could guarantee the mold thickness uniformity on core iron both sides, otherwise cause the mold thickness uneven phenomenon easily, occur running problems such as iron easily; The core iron gas permeability is offered the venthole of Φ 10mm on the core iron, guarantee that the gas in the core sand spreads to both sides by the air-vent in the core iron, and air-vent must evenly distribute on the core iron, otherwise causes core floatation because gas permeability is smooth easily; The core iron connectivity, the core iron two ends are provided with the dovetail groove that connects with fixture, this is contemplated that key assumption, can play the balance that connects and fix whole core iron, concrete shape sees that core iron shown in 4 among Fig. 3 is that the steel plate of 20mm is rolled into 90 ° of annulus that diameter is 1440mm by thickness, the annulus two ends are welded into the right-angled intersection reinforcement, and infall processes the dovetail groove device and fixture is assembled well.
6, make the typefounding core box: the carpenter makes with core box, the word of carving with rubber is put into core box made with the type resin sand core, puts into the die cavity moulding again, and it is beautiful, attractive in appearance and generous to cast out typefounding;
7, utilization waterglass alicyclic organic self-hardening sand (modified water glass: alicyclic organic: explained hereafter DN1600 * 90 ° double-bearing T shaped nodular cast iron bent pipe sand bond height sand=3.3: 0.6: 100), the bend pipe presentation quality is good;
8, pressure testing equipment making and utilization: take different pressure testing modes at different requirements, the small quantities of pressure rating of first single-piece requires low, and production efficiency is fast, sees Fig. 4; The first in batches big pressure rating requires high, and production efficiency is fast, sees Fig. 5; Every bend pipe test pressure 1.2Mpa, the dwell time is 1 minute (ISO2531 standard-required test pressure 1.0MPa, the dwell time is 30 seconds), concrete pressure testing process is seen Figure 4 and 5;
9, be coated with lining and health: material quality requirement, cement: not out of date 425#, 325#; River sand: granularity is at the 40-70 order, and content is more than 80%; Glue: polyvinyl alcohol: water=1: 20 is made into the aqueous solution.Boiling of glue, polyvinyl alcohol siccative and water are put into container in 1: 20 ratio, and steam pipe is fed heating, treat that siccative melts fully can use.River sand sieve choosing is put into 70 purpose iron with river sand and is sieved, removing greater than 70 purpose coarse sands and clod.The proportioning of material, sand: cement: glue=2: 1: 0.25.Prime cement preparation, the cement water-soaked, it is stand-by to add an amount of glue furnishing pasty state.Stir the material program, 100 kilograms of fine sands and 50 kilograms of cement add in the Mill with roller jointly, continue to stir 2 minutes, and the glue that adds 10 kilograms again continues to stir 3 minutes, and the material that stirs is placed in the fixing container, and material must use up in 2 hours.Be coated with the lining program, earlier pipe fitting inner wall cleaned out, prime cement is spread upon on the inwall at twice, the wadding that is coated with that stirs is evenly spread out, it is sliding it to be compressed and repaiies floating lay the grain with instrument, after having served as a contrast bellmouth is cleaned out.Be coated with the check of lining thickness, on the mortar that newly is coated with lining, insert the thickness that a steel nail is checked liner, or on the mortar that solidifies, check the thickness of liner, be coated with lining thickness and meet the ISO4179 standard-required with non-destructive method.The health program when temperature during greater than 25 ℃, left standstill after cement lining is finished 1.5 hours, with special-purpose sprayer to the liner natural curing of sprinkling water, maintenance in two hours once, curing time was greater than six hours; Use steam curing when temperature is lower than 25 ℃, conditioned time must surpass two hours, and natural Health preservation is four hours again.The liner cement mortar should meet the GB/T17457 requirement, and the cement mortar liner is not less than 50MPa in the regulation that the compression strength of health after 28 days should meet GB/T 17671.
Claims (2)
1. the manufacture method of a large 90-degree double-bearing T shaped nodular cast iron bend pipe is characterized in that, processing step is
(1) makes mould: die cavity epimorph, intermediate die are fixed on the base plate mould; The k type that is shaped as, T type or socket iron sample or the wooden model sample of external form mould, intermediate die be shaped as wooden model, cement-like or iron sample, the base plate mould be shaped as wooden model or swage sample;
(2) make sandbox: go up drag box adopt mold thickness 80-140mm with the molding sand case, last drag box guarantees to be controlled at 60-100mm with the mold thickness between molding sand case and the frock, sand using amount and assurance molding sand integral intensity when reducing moulding;
(3) make core box: core box adopts steel construction base and magnesium iron material half module basic structure design, and hand screw device is adopted in the folding of half module, and alignment pin is adopted in the location of half module; Adopt furan resin-sand technology and core box to make bell socket sand core, the bellmouth size for connection directly casts out;
(4) make the dovetail groove fixture: fixture is that the Q235 steel plate of 100mm is made by thickness, fixture is made two covers, fixed form between fixture and the core iron adopts dovetail groove to fix, and guarantees that the rigging error between fixture and the core iron is 1-3mm;
(5) make core iron: adopt mold thickness 60-120mm with core iron, core iron is that the Q235 steel plate of 15-30mm forms according to the weldering of figure paper roll by thickness, guarantee core iron with type, could guarantee the mold thickness uniformity on core iron both sides, offer the venthole of Φ 10mm on the core iron, be made into 90 ° of toroidals;
(6) make the typefounding core box: the carpenter makes with core box, the word of carving with rubber is put into core box made with the type resin sand core, puts into the die cavity moulding again;
(7) utilization waterglass alicyclic organic self-hardening sand explained hereafter DN1600 * 90 ° of double-bearing T shaped nodular cast iron bent pipe sand bond height;
(8) quality inspection after the pressure testing device product completes;
(9) be coated with lining and health.
2. manufacture method according to claim 1 is characterized in that, the composition of waterglass alicyclic organic self-hardening sand is: modified water glass: alicyclic organic: sand=3.0-4.0: 0.5-0.7: 100.
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| CN2009102373706A CN101875103A (en) | 2009-11-16 | 2009-11-16 | Manufacture method of large 90-degree double-bearing T shaped nodular cast iron bent pipe |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014219A (en) * | 2012-11-13 | 2013-04-03 | 南通宏德机电有限公司 | Control method of as-cast condition heavy section ferrite-based nodular iron casting graphite nodule and matrix structure |
| CN103056182A (en) * | 2013-01-24 | 2013-04-24 | 太原科技大学 | Method for producing heavy-caliber thick-walled seamless steel pipe by casting extrusion composite molding |
| CN104858372A (en) * | 2015-05-14 | 2015-08-26 | 辽宁福鞍重工股份有限公司 | Casting method for thermal power generation super-critical bend |
| CN106825437A (en) * | 2017-03-02 | 2017-06-13 | 佛山市恒学科技服务有限公司 | A kind of single bend pipe mould |
| CN108818907A (en) * | 2018-07-21 | 2018-11-16 | 厦门三航混凝土有限公司 | Section of jurisdiction conserves intelligent temperature control system and section of jurisdiction maintenance process |
| CN111390120A (en) * | 2020-05-09 | 2020-07-10 | 大连华锐重工铸业有限公司 | Core making method of middle hole sand core of large injection molding machine template casting |
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2009
- 2009-11-16 CN CN2009102373706A patent/CN101875103A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103014219A (en) * | 2012-11-13 | 2013-04-03 | 南通宏德机电有限公司 | Control method of as-cast condition heavy section ferrite-based nodular iron casting graphite nodule and matrix structure |
| CN103056182A (en) * | 2013-01-24 | 2013-04-24 | 太原科技大学 | Method for producing heavy-caliber thick-walled seamless steel pipe by casting extrusion composite molding |
| CN104858372A (en) * | 2015-05-14 | 2015-08-26 | 辽宁福鞍重工股份有限公司 | Casting method for thermal power generation super-critical bend |
| CN106825437A (en) * | 2017-03-02 | 2017-06-13 | 佛山市恒学科技服务有限公司 | A kind of single bend pipe mould |
| CN108818907A (en) * | 2018-07-21 | 2018-11-16 | 厦门三航混凝土有限公司 | Section of jurisdiction conserves intelligent temperature control system and section of jurisdiction maintenance process |
| CN111390120A (en) * | 2020-05-09 | 2020-07-10 | 大连华锐重工铸业有限公司 | Core making method of middle hole sand core of large injection molding machine template casting |
| CN111390120B (en) * | 2020-05-09 | 2021-04-23 | 大连华锐重工铸业有限公司 | Core making method of middle hole sand core of large injection molding machine template casting |
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Open date: 20101103 |