CN1436621A - Production process of steel flange blank - Google Patents
Production process of steel flange blank Download PDFInfo
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- CN1436621A CN1436621A CN 03113013 CN03113013A CN1436621A CN 1436621 A CN1436621 A CN 1436621A CN 03113013 CN03113013 CN 03113013 CN 03113013 A CN03113013 A CN 03113013A CN 1436621 A CN1436621 A CN 1436621A
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Abstract
The production process of steel flange blank includes the following steps: analyzing and blending the material including pig iron, waste steel and leftover and feeding the material into steel-making furnace; heating to 1500-1600 deg.c for 1-1.5 hr to obtain molten steel; pouring molten steel into casting ladle; preheating, painting and stoving cast mold before casting; casting, demolding and cleaning up cast blank; rolling with one pair of rolls in roller and cooling. The said process is suitable for large scale production of flange blank with compact structure and high strength.
Description
Technical field
Disclosed by the invention is a kind of steel flange blank manufacturing process, especially a kind of plane face flange, W.N flange, pile for prestressed pipe end plate flanges blank manufacturing process.
Background technology
Known, flange is a requisite connector on the various pipelines such as water delivery, gas transmission, oil transportation, chemical industry.Steel flange particularly is because it has characteristics such as intensity height, weldability are good, high pressure resistant, shock-resistant, easy for installation, so purposes more and more widely.The steel flange blank that prior art is produced, general Q235 steel and No. 20 steels of adopting are made, its technology is: forge into blank with the direct cutting stock of steel plate or with round steel after cutting off, then, carry out machining, make the steel flange blank with this kind technology, because of stock utilization is low, the technology circuit is long and cause flange cost height.
88106817.9 number Chinese patent application discloses a kind of new method of making steel flange, it is that the molten steel of the chemical analysis that meets required material that melting is obtained is poured under 1420～1480 ℃ in the steel flange mold that is installed on the centrifugal casting machine; When centrifugal casting machine rotate to drive the rotation of steel flange mold, melting and the pouring molten steel for preparing to the steel flange mold; Treat to shut down when foundry goods is cooled to below 700 ℃, on centrifugal casting machine, take off mold, take out foundry goods, obtain the steel flange blank; Obtain the finished steel flange through normalizing, conventional machined.This manufacture method perhaps has its alleged low strong point of utilization rate of raw materials height, processing cost for traditional steel plate such as worker's method and forging processing method.But the deficiency that they exist also is conspicuous: at first, because it is to adopt centrifugal casting, its tissue still is the as-cast condition tissue, and crystal grain is thick when solidifying, and causes the comprehensive mechanical intensity shortcoming of steel flange, can't be applied to the demanding occasion of strength of flange; Also have, in centrifugal casting process, all conditions are harsh, and the motor speed that pours into mold, centrifugal casting machine as molten steel with the speed of 0.5～1 Kilograms Per Second is fast or the like by reaching slowly; More and, a steel flange blank of spun casting required time is longer, accelerates to 750 rev/mins as motor speed from 600 rev/mins and will cause production efficiency very low through three fens clock times at least.
97103564.4 number patent disclosure a kind of technological process of manufacturing steel flange blank, it is through steel-making, casting, cleaning, heating, forges the final flange blank that becomes.This patented technology to a large amount of wastes of avoiding material, reduce machine-finish allowance, weak pointization process time, reduction flange cost aspect has certain contribution.But, also there is following problem objectively in this manufacturing process: 1, the manufacturing scope of flange blank is restricted, in promptly only making, the flange blank of small dimension size, and can not make such as the blank of diameter in 500mm and the above size of 500mm thereof, unless be equipped with the forging equipment of suitable specification, and to be equipped with the forging equipment of flange blank that adapt to make 500mm and above size thereof, then because of investing huge but not medium-sized and small enterprises can bear; 2, the flange blank of excellent suitability for press forming is poor because of its dense structure's degree, and comprehensive mechanical intensity is difficult to be guaranteed; 3, obtain flange blank because it is forged by die forging or cover, therefore make inefficiency; 4, owing to be that die forging or cover are forged, determined that just the environment in its operation place is greatly very abominable because of noise.
Summary of the invention
The objective of the invention is to provide a kind of and can not only make small dimension, and can make diameter muting in 500mm and the big specification more than the 500mm thereof, that mechanical strength is good, that density is high, manufacture process, make the high steel flange blank manufacturing process of efficient.
The objective of the invention is to reach like this, a kind of steel flange blank manufacturing process, it may further comprise the steps: (1) carries out analysis of components with the steel cuttings that cutting in the pig iron, steel scrap, leftover pieces or the metalworking produces, and prepares burden in proportion, and the material that proportioning is good adds intermediate frequency converter or electrical arc furnace; (2) the electric furnace furnace temperature rises to 1500 ℃～1600 ℃, and the time is 1～1.5 hour, makes to be melted into molten steel, and molten steel is done the chemical composition rapid analysis, presses steel grade and adds required element, makes it meet required steel grade chemical composition index; (3) in the time of will refining good liquid steel temperature and be controlled at 1450 ℃～1500 ℃, pour casting ladle into, send the casting line; (4) before casting also promptly steel-making in, the casting of metals mould is carried out preheating, preheat temperature is 300 ℃～400 ℃, and to spray paint in the mold, dries to be poured; (5) molten steel in the casting ladle is poured the casting of metals mould into, waits to solidify the back die sinking, takes out foundry goods, and foundry goods is cleared up, and obtains strand; (6) strand is delivered to roller through raceway, roll, obtain the steel flange blank after the cooling by a pair of milling roller of roller.
The strand temperature of delivering to roller of the present invention is 500 ℃～1200 ℃, and the rotating speed of milling roller is 50 to change～110 rev/mins, and the time of rolling was 10 second～20 seconds.
Roller of the present invention is awl roller roller.
Advantage of the present invention is: the diameter that can produce big specification is at 500mm and the flange blank more than the 500mm thereof; The institutional framework good compactness of the flange blank of grinding forming, intensity height; Owing to be to roll, foundry goods and milling roller contact-making surface are little, and the contact-making surface unit pressure increases, so less demanding to equipment; Production efficiency height and noiseless.
Accompanying drawing and drawing explanation
The process chart that Fig. 1 makes for steel flange blank of the present invention.
Fig. 2 is the principle schematic that rolls of the present invention.
Fig. 8 rolls the schematic diagram of principle through the pile for prestressed pipe end plate flanges blank 19 of a, the acquisition of b two steps for what the present invention gave an example according to Fig. 2.
Among the figure: 1,2 milling rollers, 3 outer cover dies, 4 cores, 5 strands, 6 movable mold base plates, 7 die holders, 8 oil cylinders, 9 oil cylinder piston posts, 10 bearing blocks, 11 bearings, 12 rotary disks, 13 guide pillars, 14 motors, 15 belt pulleys, 16 main shafts, 17 frames, 18, die holder frame, 19 pile for prestressed pipe end plate flanges blanks.
Specific embodiment embodiment 1:
To make PC400 pile for prestressed pipe end plate flanges blank is example, and material is ZG200-400.The thickness that will obtain through (1) to (5) step is 40mm, external diameter is 288mm, internal diameter is 180mm, temperature is 850 ℃ strand 5 is delivered to 200 tons of pressure through raceway an awl roller roller, and enter in the mould, place motor 14 work on the frame 17 of roller, drive belt pulley 15, main shaft 16 rotations, rotary disk 12 revolutions, make by bearing block 10, bearing 11 and be installed on a pair of milling roller 1 on the rotary disk 12,2 rotations, when milling roller 1, during 2 contact strands 5, a pair of milling roller 1,2 have just entered the rotation status while rolling to strand 5, its rotating speed is 90 rev/mins, work by oil cylinder 8, oil cylinder piston post 9 acts on die holder frame 18, die holder frame 18 is risen along guide pillar 13, drive die holder 7, cover die 3, core 4, strand 5 is simultaneously toward rising, while rising by a pair of taper milling roller 1 of roller, 2 is thin with strand 5 stone rollers, in this process, in the strand 5, external diameter changes respectively, through 10 seconds, be full of mold cavity, roll end, transverse saddle 18 descends, eject movable mold base plate 6, flange blank behind grinding forming also is ejected thereupon, obtains thickness therefrom, external diameter, internal diameter is respectively 18mm, 400mm, the pile for prestressed pipe end plate flanges blank 19 of 220mm.Embodiment 2:
To make PC500 pile for prestressed pipe end plate flanges blank is example, material is ZG200-400, the thickness that will obtain through (1) to (5) step is that 40mm, external diameter are that 345mm, internal diameter are that 200mm, temperature are 550 ℃ strand 5 is delivered to 500 tons of pressure through raceway awl roller roller, rolling method and principle are with embodiment 1, the rotating speed of only a pair of roller 1,2 is that 55 rev/mins, the time of rolling were 15 seconds, obtains the pile for prestressed pipe end plate flanges blank 19 that thickness, external diameter, internal diameter are respectively 20mm, 500mm, 300mm therefrom.Embodiment 3:
To make PC600 pile for prestressed pipe end plate flanges blank is example, material is ZG200-400, the thickness that will obtain through (1) to (5) step is that 40mm, external diameter are that 408mm, internal diameter are that 240mm, temperature are 700 ℃ strand 5 is delivered to 350 tons of pressure through raceway awl roller roller, rolling method and principle are with embodiment 1, the rotating speed of only a pair of roller 1,2 is that 70 rev/mins, the time of rolling were 18 seconds, obtains the pile for prestressed pipe end plate flanges blank 19 that thickness, external diameter, internal diameter are respectively 20mm, 600mm, 380mm therefrom.Embodiment 4:
The plane face flange blank of using with the manufacturing pipeline is an example, and material is the Q235 steel, and die change becomes to make the mould of plane face flange blank.The thickness that will obtain through (1) to (5) step is that 70mm, external diameter are that 575mm, internal diameter are that 450mm, temperature are 1150 ℃ strand 5 is delivered to 200 tons of pressure through raceway awl roller roller, rolling method and principle are with embodiment 1, only, a pair of milling roller 1,2 is that 100 rev/mins, the time of rolling were 20 seconds, and obtaining thickness therefrom is that 36mm, external diameter are that 860mm, internal diameter are the pipeline plane face flange blank of 700mm.Embodiment 5:
The plane face flange blank of using with the manufacturing pipeline is an example, and material is ZG200-400, and mould is for making the mould of plane face flange blank.The thickness that will obtain through (1) to (5) step is that 80mm, external diameter are that 560mm, internal diameter are that 350mm, temperature are 1000 ℃ strand 5 is delivered to 350 tons of pressure through raceway awl roller roller, rolling method and principle are with embodiment 1, only, a pair of milling roller 1,2 is that 60 rev/mins, the time of rolling were 13 seconds, and obtaining thickness therefrom is that 44mm, external diameter are that 860mm, internal diameter are the pipeline plane face flange blank of 600mm.Embodiment 6:
With the raised face welding neck flange is example, and material is 20
#Steel, die change becomes to make the mould of raised face welding neck flange blank.The thickness that will obtain through (1) to (5) step is that 100mm, external diameter are that 790mm, flange hole are that the temperature of 710mm is 1000 ℃ strand 5 is delivered to 200 tons of pressure through raceway an awl roller roller, rolling method and principle are with embodiment 1, the rotating speed of different is a pair of milling roller 1,2 is that 70 rev/mins, the time of rolling were 13 seconds, and obtaining thickness therefrom is that 26mm, external diameter are that 850mm, total height are the raised face welding neck flange blank of 70mm.
Claims (3)
1, a kind of steel flange blank manufacturing process, it is characterized in that it may further comprise the steps: (1) carries out analysis of components with the steel cuttings that cutting in the pig iron, steel scrap, leftover pieces or the metalworking produces, prepare burden in proportion, the material that proportioning is good adds intermediate frequency converter or electrical arc furnace; (2) the electric furnace furnace temperature rises to 1500 ℃～1600 ℃, and the time is 1～1.5 hour, makes to be melted into molten steel, and molten steel is done the chemical composition rapid analysis, presses steel grade and adds required element, makes it meet required steel grade chemical composition index; (3) in the time of will refining good liquid steel temperature and be controlled at 1450 ℃～1500 ℃, pour casting ladle into, send the casting line; (4) before casting also promptly steel-making in, the casting of metals mould is carried out preheating, preheat temperature is 300 ℃～400 ℃, and to spray paint in the mold, dries to be poured; (5) molten steel in the casting ladle is poured the casting of metals mould into, waits to solidify the back die sinking, takes out foundry goods, and foundry goods is cleared up, and obtains strand; (6) strand is delivered to roller through raceway, roll, obtain the steel flange blank after the cooling by a pair of milling roller of roller.
2, steel flange blank manufacturing process according to claim 1, the strand temperature that it is characterized in that delivering to roller is 500 ℃～1200 ℃, and the rotating speed of milling roller is 50 to change～110 rev/mins, and the time of rolling was 10 second～20 seconds.
3, steel flange blank manufacturing process according to claim 1 and 2 is characterized in that roller is an awl roller roller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03113013 CN1436621A (en) | 2003-03-21 | 2003-03-21 | Production process of steel flange blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03113013 CN1436621A (en) | 2003-03-21 | 2003-03-21 | Production process of steel flange blank |
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| Publication Number | Publication Date |
|---|---|
| CN1436621A true CN1436621A (en) | 2003-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03113013 Pending CN1436621A (en) | 2003-03-21 | 2003-03-21 | Production process of steel flange blank |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008095446A1 (en) * | 2007-02-08 | 2008-08-14 | Chengxiang Fan | A method for making ring forging component |
| CN101974720A (en) * | 2010-11-03 | 2011-02-16 | 重庆市美中汽车配件有限公司 | Method for manufacturing spring steel |
| CN102416557A (en) * | 2011-10-25 | 2012-04-18 | 马鞍山市威龙科工贸有限公司 | Integrated production technology for ring cast forging |
-
2003
- 2003-03-21 CN CN 03113013 patent/CN1436621A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008095446A1 (en) * | 2007-02-08 | 2008-08-14 | Chengxiang Fan | A method for making ring forging component |
| CN101974720A (en) * | 2010-11-03 | 2011-02-16 | 重庆市美中汽车配件有限公司 | Method for manufacturing spring steel |
| CN102416557A (en) * | 2011-10-25 | 2012-04-18 | 马鞍山市威龙科工贸有限公司 | Integrated production technology for ring cast forging |
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