CN101767131A - Hot-press molding method for thick-walled elbow without inner core - Google Patents
Hot-press molding method for thick-walled elbow without inner core Download PDFInfo
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- CN101767131A CN101767131A CN201010107966A CN201010107966A CN101767131A CN 101767131 A CN101767131 A CN 101767131A CN 201010107966 A CN201010107966 A CN 201010107966A CN 201010107966 A CN201010107966 A CN 201010107966A CN 101767131 A CN101767131 A CN 101767131A
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Abstract
The invention relates to a hot-press molding method for a thick-walled elbow without an inner core, which is used for the hot-press molding of the thick-walled elbow of an industrial metal pipe. The method comprises the following technological processes: selecting a seamless pipe, cutting the seamless pipe in accordance with the required lengths and squashing a pipe blank into an ellipse on a hydraulic press, and heating the pipe blank; putting the heated pipe blank on a lower molding die in the minor axis horizontal direction of the ellipse, and placing a horse hoof die on two sides of the pipe blank; pressing the pipe blank in the descending direction by the upper molding die, during the pressing process of pressing to the elbow outer diameter in the macro axis direction of the ellipse, the pressure is transmitted to the lower part by the rigidity of the thick-walled steel pipe through the upper part of the pipe blank, thereby molding the lower part of the pipe blank along the cavity of the lower molding die, simultaneously the lower two ends of the pipe blank is pressed and the circular degree of the inner diameter of the two ends is kept by the horse hoof die until that the thick-walled elbow is pressed to a mold after the die assembly of the upper molding die and the lower molding die; and lifting the upper molding die, removing the thick-walled elbow from the lower die, thereby finishing the pressing process. The invention has the advantages of simple process, easy operation, decreases the work intensity, and improves the molding quality.
Description
(1) technical field
The present invention relates to a kind of hot-press molding method for thick-walled elbow without inner core.Be used for the hot-forming of Industrial Metal pipeline thick-wall elbow.Metal conduit connector production technical field.
(2) background technology
In industrial pipeline, adopting the thick-wall elbow of seamless steel pipe manufacturing is a kind of pipe fitting that is used for high pressure and super-pressure operating mode.Its hot-press molding method in the past is to adopt inner core hot-forming: choose seamless steel pipe consistent with the thick-wall elbow external diameter, that wall thickness is slightly larger than the elbow wall thickness, length cuts into pipe 1 on request, as depicted in figs. 1 and 2, in heating furnace, pipe 1 is heated to the forming temperature of technological requirement; The pipe 1 the longest end that heats is placed in down downwards on the finishing die 2, water chestnut mould 3 is placed on pipe 1 two ends after interior core 7 being inserted the middle part of pipe 1, as Fig. 3; Last finishing die 4 is descending to be suppressed pipe 1, exert pressure in the middle part, bottom of pressure 7 pairs of pipes 1 of core in the top of pipe 1 is transmitted to, meanwhile, water chestnut mould 3 keeps the internal diameter circularity at both ends in compacting pipe 1 bottom two-end part, behind upper and lower finishing die matched moulds with thick-wall elbow 5 press formings; Last finishing die 4 liftings, take off take out as early as possible behind the water chestnut mould 3 in core 7; Thick-wall elbow 5 from finishing die 2 taking-ups down, is finished compacting work, as Fig. 4.Its shortcoming is:
1) bottom of interior core will be made into the shape consistent with the interior diameter and arc surface of thick-wall elbow outer arc, and processing is difficulty;
When 2) interior core is inserted the medium position of pipe must with the equidistant centering in pipe both sides, the time of finding accurately is long;
3) the core card is pressed in the elbow middle part in behind the thick-wall elbow press forming, and difficult the taking-up particularly reduced in temperature and caused that elbow shrinks the back and takes out difficulty more, and the labour intensity of core is bigger in getting;
4) the supporting role meeting because of interior core top causes the thick-wall elbow inwall that contacts with interior core top the pit impression to occur, needs follow-up polishing finishing; When pit depth surpasses the minimum wall thickness (MINI W.) of thick-wall elbow regulation, will cause the defective of heavy wall hot-pressed elbow.
(3) summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, provide a kind of technology simple, easy to operate, reduce labour intensity, improve the hot-press molding method for thick-walled elbow without inner core of forming quality.
The object of the present invention is achieved like this: a kind of hot-press molding method for thick-walled elbow without inner core, described method comprises following technical process: choose external diameter and wall thickness respectively greater than the seamless steel pipe of thick-wall elbow external diameter and wall thickness 3～7%, after the length cutting pipe is flattened on hydraulic press to ellipticity on request, the long axis of ellipse direction is respectively the longest end and the shortest end of pipe length, and oval minor axis length is less than the elbow external diameter; In heating furnace with the forming temperature of heating of pipe blank to technological requirement; The pipe that heats is placed in down on the finishing die by the ellipse short shaft horizontal direction, and the water chestnut mould is placed on the pipe two ends; Last finishing die is descending to be suppressed pipe, be compressed to along the transverse direction in the pressing process of elbow external diameter, the rigidity of thick walled steel tube itself is transmitted to the bottom with pressure through the top of pipe, the bottom that makes pipe is along finishing die inner chamber shaping down, meanwhile, the water chestnut mould keeps the internal diameter circularity at both ends in the two-end part of compacting pipe bottom, behind upper and lower finishing die matched moulds with the thick-wall elbow press forming; Last finishing die lifting is taken out thick-wall elbow from counterdie, finish compacting work.
Hot-press molding method for thick-walled elbow without inner core of the present invention utilizes the deformation characteristics press forming of pipe itself by changing pipe diameter and shape, and technology is simple, and is easy to operate, reduced labour intensity, improved forming quality.
The invention has the beneficial effects as follows:
1) need not in the processing and fabricating of core, reduce die cost;
2) save the time of laying and taking out interior core, simple to operate, reduced labour intensity;
3) the thick-wall elbow inner wall smooth does not have impression, and forming quality is good, has saved the work of polishing inwall, has improved the qualification rate of hot pressing thick-wall elbow.
(4) description of drawings
Fig. 1 in the past on request length cut into the pipe schematic diagram.
Fig. 2 is the side view of Fig. 1.
Fig. 3 was for there was the preceding schematic diagram of inner core heat pressing and molding mold moulding in the past.
Fig. 4 was for there was schematic diagram after the moulding of inner core heat pressing and molding mold in the past.
Fig. 5 for the present invention on request length cut into the pipe schematic diagram.
Fig. 6 is the side view of Fig. 5.
Fig. 7 has schematic diagram before the moulding of inner core heat pressing and molding mold for the present invention.
Fig. 8 has schematic diagram after the moulding of inner core heat pressing and molding mold for the present invention.
Reference numeral among the figure:
(5) specific embodiment
Hot-press molding method for thick-walled elbow without inner core of the present invention, described method comprises following technical process: choose external diameter and wall thickness respectively greater than the seamless steel pipe of thick-wall elbow external diameter and wall thickness 3～7%, after the length cutting pipe 1 is flattened on hydraulic press to ellipticity on request, the long axis of ellipse direction is respectively the longest end and the shortest end of pipe 1 length, oval minor axis length is less than the elbow external diameter, as shown in Figure 5 and Figure 6; In heating furnace, pipe 1 is heated to the forming temperature of technological requirement; The pipe 1 that heats is placed in down on the finishing die 2 by the ellipse short shaft horizontal direction, water chestnut mould 3 is placed on pipe 1 two ends, as Fig. 7; Last finishing die 4 is descending to be suppressed pipe 1, be compressed to along the transverse direction in the pressing process of elbow external diameter, the rigidity of thick walled steel tube itself is transmitted to the bottom with pressure through the top of pipe 1, the bottom that makes pipe 1 is along finishing die 2 inner chambers shaping down, meanwhile, water chestnut mould 3 keeps the internal diameter circularity at both ends in compacting pipe 1 bottom two-end part, behind upper and lower finishing die matched moulds with thick-wall elbow 5 press formings; Last finishing die 4 liftings are taken out thick-wall elbow 5 from counterdie 2, finish compacting work, as Fig. 8.
Claims (1)
1. hot-press molding method for thick-walled elbow without inner core, it is characterized in that described method comprises following technical process: choose external diameter and wall thickness respectively greater than the seamless steel pipe of thick-wall elbow external diameter and wall thickness 3～7%, after the length cutting pipe is flattened on hydraulic press to ellipticity on request, the long axis of ellipse direction is respectively the longest end and the shortest end of pipe length, and oval minor axis length is less than the elbow external diameter; In heating furnace with the forming temperature of heating of pipe blank to technological requirement; The pipe that heats is placed in down on the finishing die by the ellipse short shaft horizontal direction, and the water chestnut mould is placed on the pipe two ends; Last finishing die is descending to be suppressed pipe, be compressed to along the transverse direction in the pressing process of elbow external diameter, the rigidity of thick walled steel tube itself is transmitted to the bottom with pressure through the top of pipe, the bottom that makes pipe is along finishing die inner chamber shaping down, meanwhile, the water chestnut mould keeps the internal diameter circularity at both ends in the two-end part of compacting pipe bottom, behind upper and lower finishing die matched moulds with the thick-wall elbow press forming; Last finishing die lifting is taken out thick-wall elbow from counterdie, finish compacting work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010107966A CN101767131A (en) | 2010-02-03 | 2010-02-03 | Hot-press molding method for thick-walled elbow without inner core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010107966A CN101767131A (en) | 2010-02-03 | 2010-02-03 | Hot-press molding method for thick-walled elbow without inner core |
Publications (1)
| Publication Number | Publication Date |
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| CN101767131A true CN101767131A (en) | 2010-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010107966A Pending CN101767131A (en) | 2010-02-03 | 2010-02-03 | Hot-press molding method for thick-walled elbow without inner core |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102240716A (en) * | 2011-06-03 | 2011-11-16 | 燕山大学 | Bending and horizontal type reshaping method of high-pressure bend |
| CN102240698A (en) * | 2011-06-03 | 2011-11-16 | 燕山大学 | Reducing and hot-pressing formation method for high-pressure bend elliptical pipe billet |
| CN103394547A (en) * | 2013-07-30 | 2013-11-20 | 西安优耐特容器制造有限公司 | Elbow forming method |
| CN108889792A (en) * | 2018-05-25 | 2018-11-27 | 无锡市新峰管业有限公司 | A kind of super wall thickness seamless elbow pipe fitting forming technique of heavy caliber |
| CN110216233A (en) * | 2019-05-21 | 2019-09-10 | 渤海重工管道有限公司 | A kind of production method of heavy wall seamless elbow |
| CN112780865A (en) * | 2021-01-15 | 2021-05-11 | 蓬莱水城铸石管道阀门有限公司 | Manufacturing method of cast stone composite elbow and cast stone composite elbow |
-
2010
- 2010-02-03 CN CN201010107966A patent/CN101767131A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102240716A (en) * | 2011-06-03 | 2011-11-16 | 燕山大学 | Bending and horizontal type reshaping method of high-pressure bend |
| CN102240698A (en) * | 2011-06-03 | 2011-11-16 | 燕山大学 | Reducing and hot-pressing formation method for high-pressure bend elliptical pipe billet |
| CN102240698B (en) * | 2011-06-03 | 2013-01-30 | 燕山大学 | Reducing and hot-pressing formation method for high-pressure bend elliptical pipe billet |
| CN102240716B (en) * | 2011-06-03 | 2013-07-03 | 燕山大学 | Bending and horizontal type reshaping method of high-pressure bend |
| CN103394547A (en) * | 2013-07-30 | 2013-11-20 | 西安优耐特容器制造有限公司 | Elbow forming method |
| CN108889792A (en) * | 2018-05-25 | 2018-11-27 | 无锡市新峰管业有限公司 | A kind of super wall thickness seamless elbow pipe fitting forming technique of heavy caliber |
| CN108889792B (en) * | 2018-05-25 | 2020-03-17 | 无锡市新峰管业有限公司 | Forming process of large-caliber super-wall-thickness seamless elbow pipe fitting |
| CN110216233A (en) * | 2019-05-21 | 2019-09-10 | 渤海重工管道有限公司 | A kind of production method of heavy wall seamless elbow |
| CN112780865A (en) * | 2021-01-15 | 2021-05-11 | 蓬莱水城铸石管道阀门有限公司 | Manufacturing method of cast stone composite elbow and cast stone composite elbow |
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Open date: 20100707 |