CN100387377C - Manufacturing technique of double-flange spheroidal graphite cast-iron pipe - Google Patents
Manufacturing technique of double-flange spheroidal graphite cast-iron pipe Download PDFInfo
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- CN100387377C CN100387377C CNB2006100482334A CN200610048233A CN100387377C CN 100387377 C CN100387377 C CN 100387377C CN B2006100482334 A CNB2006100482334 A CN B2006100482334A CN 200610048233 A CN200610048233 A CN 200610048233A CN 100387377 C CN100387377 C CN 100387377C
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Abstract
The invention relates to a method for producing dual-flange spheroidal graphite tube. Wherein, it comprises that first eccentrically casting single flange spheroidal graphite; casting the flange at another end; it uses section chamber with self sand as the section chamber of later casting flange; the end surface of flange has process ring, to mount the rigid sand section on another end of spheroidal graphite tube; the tube is heated at the part relative to the self rigid sand section via high-frequency sensor; when it is heated to 800-1050Deg. C, blocking the tube with core and irrigating the balled iron water at 1350-1450Deg. C on the section chamber to obtain blank; processing into final product. The invention combines high-frequency heating method and flange dual-phase smelting method, to combine the later casting flange and main body, to support 4MPa pressure, without leakage at later casting flange.
Description
Technical field
The present invention relates to the manufacture method of a kind of manufacture method of ductile iron pipe, particularly a kind of double-flange spheroidal graphite cast-iron pipe.
Background technology
Usually, sand casting double-flange spheroidal graphite cast-iron pipe or gray cast iron pipe, maximum length is no more than two meters; Adopting the manufacturing process of the two flange steel pipes of low-carbon steel material welding is to make flange and steel pipe respectively, afterwards that it is integrally welded.Though steel pipe can arbitrarily be made by the processor aspect size, in medium processes such as transporting water, mud, cement mortar, performance such as it is corrosion-resistant, wear-resisting is poor, and service life is low.CN1098971A discloses a kind of resin bonded sand mould and has produced ductile iron pipe, be to make resin bonded sand mould with the thermosetting centrifugal method, be about to the metal pipe die and be heated to 220～250 ℃, and be placed on the carrying roller and rotate, its speed is 45～180 rev/mins, add a certain amount of resin sand at sand arranging slot, make sand arranging vechicle with the walking of 10～14 meters/component velocity, sand arranging slot all is advanced in the metal pipe die, the rotation sand arranging slot, make the even cloth of resin sand at metal pipe die inwall with centrifugal method, thick 5～the 8mm that remains on of sand withdraws from sand arranging slot, behind overcuring, the metal pipe die is moved to the spheroidal graphite molten iron of casting on the centrifuge, and make the needed ductile iron pipe and the demoulding.This technology can not solve the processing problems of the double-flange spheroidal graphite cast-iron pipe of big length.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned prior art, a kind of manufacturing process of double-flange spheroidal graphite cast-iron pipe is provided, technical problem to be solved is after centrifugal casting goes out single flanged cast-iron pipe of big length (long as 6 meters), the flange of the other end (i.e. back casting orchid) in the founding how, make it to be fused into and be formed as one double-flange spheroidal graphite cast-iron pipe with main body, and can bear the pipeline pressure of 4MPa, under rated pressure, the blue part of back casting must not seepage.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
A kind of manufacturing process of double-flange spheroidal graphite cast-iron pipe, the single flange spheroidal graphite cast-iron pipe of centrifugal casting at first, after annealing, the flange of the other end in the founding again, in the founding before the flange of the other end earlier behind the outer round surface of this end the die cavity position of casting orchid process several grooves; The concrete manufacture method of the flange of the other end is to adopt the die cavity of the die cavity of self-curing mo(u)ld as back casting orchid in the founding, and at end face of flange increase technology ring, it forms the fuse that the die cavity of this technology ring is formed separately by the die cavity of self-curing mo(u)ld or made by the right mould and the self-hardening sand of self-curing mo(u)ld jointly from the part that the pore of cast iron pipe stretches out, self-curing mo(u)ld is assembled in advance on the other end of cast iron pipe, in the pore of this end with high-frequency inductor heating cast iron pipe with the corresponding position of self-curing mo(u)ld, when the temperature of the above-mentioned heating location of cast iron pipe reaches 800～1050 ℃, rapidly ready fuse is blocked the pore of cast iron pipe at this end, simultaneously that spheroidising is good temperature is that 1350～1450 ℃ molten iron in time is poured in the above-mentioned die cavity, the cast iron pipe of high temperature liquid iron and heating is combined together, promptly become the double-flange spheroidal graphite cast-iron pipe blank behind the molten steel solidification; Dead head, technology ring are removed in processing afterwards, and reprocessing two ends end face of flange, waterline, bolt hole promptly become two flange production tubes.
In the technique scheme, self-curing mo(u)ld can be resin bonded sand mould.The heating copper tube of high-frequency inductor can be 2～3 circles, and the power of high-frequency inductor can be 70kW, and be 40～50 seconds (through test, when heat time heating time was in this scope, the temperature of the above-mentioned heating location of cast iron pipe reached 900～1000 ℃) heat time heating time.The quantity of above-mentioned groove can be 1～4, or more than 4, can adopt the processing of turning or grinding or other method.Process several grooves and be used to increase the adhesion of cast iron pipe and back casting orchid.The die cavity of above-mentioned technology ring is preferably formed jointly by the part that the pore from cast iron pipe of the right mould of self-curing mo(u)ld and fuse stretches out, the die cavity of technology ring preferably is the annulus bodily form (also can be other shape), fuse is that diameter becomes big three variable cross-section cylinders (can be with endoporus also can not be with endoporus) successively from left to right, right mould has less inboard endoporus of diameter and the bigger outside endoporus of diameter, the inboard endoporus of right mould is connected with the die cavity of back casting orchid, the termination of this end of the founding upper flange of cast iron pipe puts in the inboard endoporus of right mould, when fuse is blocked the pore of cast iron pipe, the outside endoporus that a cylinder of its maximum gauge inserts right mould matches with it, and the pore of a cylinder insertion cast iron pipe of the minimum diameter of fuse is also unidirectional spacing by the end face of cast iron pipe in its shaft shoulder position, and the die cavity of technology ring is by the inboard inner hole wall of right mould, the corresponding inner face of inboard endoporus of the cylindrical and right mould of of the maximum gauge of fuse, cylindrical side, the centre of fuse forms jointly.Fuse can be made by resin sand, and fuse can become three variable cross-section cylinders big, the band endoporus successively for diameter from left to right.In the founding before the flange of the other end, preferably earlier single flange spheroidal graphite cast-iron pipe is carried out the water pressure test, qualified after the flange of the other end in the founding again; Before the end face of flange of processing two ends, preferably carry out the water pressure test once more, reprocessing two ends, qualified back end face of flange.Preferred 900～1000 ℃ of the temperature of the heating location of above-mentioned cast iron pipe, preferred 1400～1420 ℃ of the temperature of the molten iron that spheroidising is good.
How molten metal and the founding of cast iron pipe main body with high temperature is integral, and is the key problem in technology of two flanged cast-iron pipes.This high-melting-point nodular cast iron alloy solid, liquid two-phase founding all-in-one-piece technology, difficulty is big, poor operability, each procedure technology parameter necessary suitable, coupling, the especially pouring temperature of cast iron pipe heating-up temperature and iron liquid (molten iron), both must mate could guarantee that founding goes out certified products, otherwise, defectives such as two-layer skin, superfusion can occur, the seepage during water pressure test does not reach instructions for use.Cast iron pipe of the present invention is will cast than two flanged pipes of big length (long as 6 meters) earlier, reprocessing end face of flange, waterline, bolt hole, because workpiece is oversize, the processing flange needs special purpose machine tool, and the bolt hole that guarantees to process the flange two ends must be coaxial, both ends of the surface are parallel, and are vertical with cast tube, must adopt special-purpose boring, milling machine tool, special-purpose porous rig and special-purpose tire, jig could guarantee above-mentioned requirements.The present invention adopts the metallurgical binding method of high-frequency heating and the founding of flange two-phase and processing, the manufacture method of the two flanged pipes of overlength, make casting blue fusion the in back become one with main body, and can bear the pipeline pressure of 4MPa, and under rated pressure, the blue part ne-leakage of back casting.Cast iron pipe mechanical performance of the present invention is better than common steel tube, and corrosion resistance improves 2～4 times, and the life-span improves more than 2 times, will become the renewal product in the industry infrastructure construction, and economic and social benefit is remarkable.
Description of drawings
The structural representation of double-flange spheroidal graphite cast-iron pipe when the back casting is blue that Fig. 1 makes for adopting the present invention.
Fig. 2 is the structural representation of the double-flange spheroidal graphite cast-iron pipe (production tube) of employing the present invention manufacturing.
The specific embodiment
With reference to Fig. 1, Fig. 2, to make 6 meters long double-flange spheroidal graphite cast-iron pipes is example, the present invention is the single flange spheroidal graphite cast-iron pipe 1 of centrifugal casting at first, through annealing, the water pressure test qualified after, the die cavity position of casting orchid can adopt method for turning to process several (can be 1～4 behind the outer round surface of the other end, or more than 4, present embodiment is two) groove 11, again the flange 2 of this end in the founding '.Its concrete manufacture method is to adopt self-curing mo(u)ld (as resin bonded sand mould, waterglass sand mold, overlay film sand mold, dry sand mold etc., present embodiment is selected resin bonded sand mould for use) die cavity as the die cavity 2 of back casting orchid, and, the heat-retaining capacity of resin bonded sand mould (being self-curing mo(u)ld) is strengthened at end face of flange increase technology ring.Resin bonded sand mould divides left mould and right mould.The die cavity 4 of technology ring is formed separately by the die cavity of resin bonded sand mould or is formed jointly by the part that the pore from cast iron pipe of the right mould of resin bonded sand mould and fuse 5 stretches out, and the die cavity 4 of technology ring is formed jointly by the part that the pore from cast iron pipe of the right mould of resin bonded sand mould and fuse 5 stretches out in the present embodiment.The die cavity of technology ring is the annulus bodily form, fuse is that diameter becomes three big variable cross-section cylinders successively from left to right, right mould has less inboard endoporus of diameter and the bigger outside endoporus of diameter, the inboard endoporus of right mould is connected with the die cavity of back casting orchid, the termination of this end of the founding upper flange of cast iron pipe puts in the inboard endoporus of right mould, when fuse is blocked the pore of cast iron pipe, the outside endoporus that a cylinder of its maximum gauge inserts right mould matches with it, and the pore of a cylinder insertion cast iron pipe of the minimum diameter of fuse is also unidirectional spacing by the end face of cast iron pipe in its shaft shoulder position, and the die cavity of technology ring is by the inboard inner hole wall of right mould, the corresponding inner face of inboard endoporus of the cylindrical and right mould of of the maximum gauge of fuse, cylindrical side, the centre of fuse forms jointly.Fuse 5 is an overall structure, it is made (as being made by resin sand, water-glass sand, precoated sand, dry sand etc. by self-hardening sand, fuse is made by resin sand in the present embodiment), fuse 5 is that diameter becomes three variable cross-section cylinders big, the band endoporus successively from left to right, the weight of fuse alleviates to some extent like this, also have degassing function concurrently, certainly, fuse also can be with endoporus.Resin bonded sand mould (being self-curing mo(u)ld) is assembled on the other end of cast iron pipe in advance, in the pore of this end with high-frequency inductor heating cast iron pipe with the corresponding position of resin bonded sand mould, (coiling of individual layer hollow copper tubing spirality forms) can (present embodiment be selected 3 circles for use to the heating copper tube of high-frequency inductor for 2～3 circles, can certainly be some circles), it puts in and is in the pore and the corresponding position of resin bonded sand mould, when reaching 800～1050 ℃, the temperature of the above-mentioned heating location of cast iron pipe (for example can be 800 ℃ or 850 ℃ or 900 ℃ or 950 ℃ or 1000 ℃ or 1050 ℃, record from the inner surface of cast iron pipe) time, rapidly ready fuse 5 is blocked the pore of cast iron pipe at this end, simultaneously that spheroidising is good temperature is that the molten iron of 1350～1450 ℃ (for example can be 1350 ℃ or 1400 ℃ or 1410 ℃ or 1420 ℃ or 1450 ℃) in time is poured in the above-mentioned die cavity, the cast iron pipe interaction of high temperature liquid iron and heating is combined together, promptly become the double-flange spheroidal graphite cast-iron pipe blank behind the molten steel solidification.Clear up self-curing mo(u)ld and fuse afterwards, with diamond saw blade excision dead head 3 and technology ring, carry out the water pressure test once more, two ends end face of flange, the waterline of the special-purpose two flanged pipes of horizontal boring-mill work lathe (special purpose machine tool that machine tool plant designs as required, makes) processing are adopted in qualified back, and guarantee that the two ends end face of flange is vertical with pipe shaft; Process bolt hole on the flange with special-purpose porous rig more afterwards, and guarantee the bolt hole almost coaxial on two end flanges, promptly become two flange production tubes.The technology of two meters long double-flange spheroidal graphite cast-iron pipes of the technology of above-mentioned processing two ends end face of flange, waterline, bolt hole and existing processing or gray cast iron pipe is close.
The power of above-mentioned high-frequency inductor can be 70kW, and be 40～50 seconds heat time heating time.Machined grooves 11 is the adhesions that are used to increase cast iron pipe and back casting orchid.
Claims (9)
1. the manufacturing process of a double-flange spheroidal graphite cast-iron pipe, the single flange spheroidal graphite cast-iron pipe of centrifugal casting at first, after annealing, the flange of the other end in the founding is characterized in that the preceding elder generation of flange die cavity position of casting orchid behind the outer round surface of this end of the other end in the founding processes several grooves again; The manufacture method of the flange of the other end is to adopt the die cavity of the die cavity of self-curing mo(u)ld as back casting orchid in the founding, and at end face of flange increase technology ring, it forms the fuse that the die cavity of this technology ring is formed separately by the die cavity of self-curing mo(u)ld or made by the right mould and the self-hardening sand of self-curing mo(u)ld jointly from the part that the pore of cast iron pipe stretches out, self-curing mo(u)ld is assembled in advance on the other end of cast iron pipe, in the pore of this end with high-frequency inductor heating cast iron pipe with the corresponding position of self-curing mo(u)ld, when the temperature of the above-mentioned heating location of cast iron pipe reaches 800～1050 ℃, rapidly ready fuse is blocked the pore of cast iron pipe at this end, simultaneously that spheroidising is good temperature is that 1350～1450 ℃ molten iron in time is poured in the above-mentioned die cavity, the cast iron pipe of high temperature liquid iron and heating is combined together, promptly become the double-flange spheroidal graphite cast-iron pipe blank behind the molten steel solidification;
Dead head, technology ring are removed in processing afterwards, and reprocessing two ends end face of flange, waterline, bolt hole promptly become two flange production tubes.
2. manufacturing process according to claim 1 is characterized in that above-mentioned self-curing mo(u)ld is a resin bonded sand mould.
3. manufacturing process according to claim 1, the heating copper tube that it is characterized in that above-mentioned high-frequency inductor is 2～3 circles.
4. according to claim 1 or 3 described manufacturing process, the power that it is characterized in that above-mentioned high-frequency inductor is 70kW, and be 40～50 seconds heat time heating time.
5. manufacturing process according to claim 1, the die cavity that it is characterized in that above-mentioned technology ring is formed jointly by the part that the pore from cast iron pipe of the right mould of self-curing mo(u)ld and fuse stretches out, the die cavity of technology ring is the annulus bodily form, fuse is that diameter becomes three big variable cross-section cylinders successively from left to right, right mould has less inboard endoporus of diameter and the bigger outside endoporus of diameter, the inboard endoporus of right mould is connected with the die cavity of back casting orchid, the termination of this end of the founding upper flange of cast iron pipe puts in the inboard endoporus of right mould, when fuse is blocked the pore of cast iron pipe, the outside endoporus that a cylinder of its maximum gauge inserts right mould matches with it, and the pore of a cylinder insertion cast iron pipe of the minimum diameter of fuse is also unidirectional spacing by the end face of cast iron pipe in its shaft shoulder position, and the die cavity of technology ring is by the inboard inner hole wall of right mould, the corresponding inner face of inboard endoporus of the cylindrical and right mould of of the maximum gauge of fuse, cylindrical side, the centre of fuse forms jointly.
6. manufacturing process according to claim 1 or 5 is characterized in that above-mentioned fuse made by resin sand, and fuse becomes three variable cross-section cylinders big, the band endoporus successively for diameter from left to right.
7. manufacturing process according to claim 1, it is characterized in that the flange of the other end in the founding before, earlier single flange spheroidal graphite cast-iron pipe is carried out the water pressure test, qualified after the flange of the other end in the founding again; Before the end face of flange of processing two ends, carry out the water pressure test once more, reprocessing two ends, qualified back end face of flange.
8. manufacturing process according to claim 1, the temperature that it is characterized in that the heating location of above-mentioned cast iron pipe is 900～1000 ℃, the temperature of the molten iron that spheroidising is good is 1400～1420 ℃.
9. manufacturing process according to claim 1, the quantity that it is characterized in that above-mentioned groove is 1～4, adopts the method for turning or grinding to process.
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| CNB2006100482334A CN100387377C (en) | 2006-09-01 | 2006-09-01 | Manufacturing technique of double-flange spheroidal graphite cast-iron pipe |
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| CNB2006100482334A CN100387377C (en) | 2006-09-01 | 2006-09-01 | Manufacturing technique of double-flange spheroidal graphite cast-iron pipe |
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| CN100387377C true CN100387377C (en) | 2008-05-14 |
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