CN1093444C - Process for expanding end of large diameter thick wall steel pipe - Google Patents
Process for expanding end of large diameter thick wall steel pipe Download PDFInfo
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- CN1093444C CN1093444C CN99117003A CN99117003A CN1093444C CN 1093444 C CN1093444 C CN 1093444C CN 99117003 A CN99117003 A CN 99117003A CN 99117003 A CN99117003 A CN 99117003A CN 1093444 C CN1093444 C CN 1093444C
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- steel pipe
- workpiece
- thick wall
- expanding
- large diameter
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Abstract
The present invention relates to a technical method for expanding the end of a steel pipe with a large caliber and a thick wall, which adopts a technology of intermediate-frequency heating roller forming to solve the making problem of a socket bell mouth of a steel pipe with a large caliber and a thick wall and exactly control the length of the socket bell mouth, the expanding diameter of the bell mouth and the transition length of the bell mouth and a straight section. Compared with a traditional pipe expanding mode, the technical method has the advantages of simple making requirements, low production cost and stable quality.
Description
The present invention relates to process for expanding end of large diameter thick wall steel pipe.
Adopt steel pipe socket horn mouth structure, the advantage that tool is easy for installation, circulation medium is unobstructed.Usually the preparation method of steel pipe enlarging is the cold conditions mechanical swelling, and the most frequently used cold conditions preparation method is that the mould extruding is expanded the mouth of pipe and rolled the enlarging of mould extruding pipe end about adopting.Before a kind of method except that must being equipped with the large-tonnage hydraulic press, the cost of manufacture height of mould, and be not suitable for the expanding end of larger caliber thick walled steel tube; A kind of method in back then only is applicable to the expanding end of more small-bore thin-wall steel tube.
The objective of the invention is at the problems referred to above, propose a kind of process for expanding end of large diameter thick wall steel pipe, it can accurately control diameter, length and the transition section length of thick walled steel tube expanding end, and expense is low, simple for production.
The present invention at first utilizes Frequency Induction Heating with the end of steel pipe, and heating and temperature control adopts special-purpose pipe expander to expand system at 850 degree～900 degree then.
During expander of the present invention, adopt the workpiece rotation, roll the mold pressing head, form the port expansion the workpiece roll extrusion.
The present invention adopts the heating in medium frequency rolling technology, and equipment, mould are less demanding, and single mold can be used for 1 meter to 5 meters of diameter of steel tube, the thickness expanding end smaller or equal to 65 millimeters various thickness steel pipes; Suitable equally greater than 65 millimeters steel pipe expanding end for diameter greater than 5 meters, thickness.The present invention greatly reduces production cost, and simple for production, easy for installation.
Now the present invention is further described:
Main technical requirements of the present invention:
Intermediate frequency (1000KW or 500KW) eddy-current heating;
The control of far infrared temperature, the control temperature is 850 ℃～900 ℃;
Power lathe drives workpiece (1～1.5r/min) rotation at a slow speed;
Roll extrusion die head (contacting with steel tube end part) presses down and with the equidirectional rotation of workpiece;
Hydraulic feed;
Spacing control puts in place;
Air cooling
Following embodiment is the detailed description that φ 2032～φ 3870 feed pipes are made:
1. important technological parameters: workload: 21320t;
The minimum thickness of pipe: 12.5mm;
The maximum thickness of pipe: 42mm;
Its enlarging requires as shown in Figure 1, and 3 is workpiece (steel pipe);
2. main production equipments:
(1) face lathe C6031A
The C6031A lathe is placed on the special stand platform, makes it to satisfy maximum pipe fitting rotation and bears the needs of workpiece peak torque; Be equipped with chuck special, the workpiece of easy to setup and various different tube diameters, and be connected and fixed.
The effect of this lathe is the clamping pipe fitting, and drives the workpiece rotation, and the parts that are connected with workpiece are chuck specials.
(2) 1000KW heating in medium frequency power supply
Experimental stage uses the 500KW intermediate frequency as heating power supply, and it is slower to heat up, and time-consuming efficient is low; Through the measuring and calculating workload, customized again 1000KW intermediate frequency power supply, efficient has improved, and quality also is guaranteed.
As shown in Figure 3, intermediate frequency power supply voltage is 380V, and the output bus is connected with heat induced circle 7, and induction coil 7 is from the about 30mm of workpiece 3 distances, induction coil 7 and output bus water flowing (pressure is 0.15Mpa) cooling.
The effect of intermediate frequency power supply is to provide energy source to the heat induced circle.
(3) induction heating circle
Induction heating circle 7 connects intermediate frequency power supply, to workpiece 3 horn mouth roll extrusion place heating, but must not contact with rotational workpieces; The type of cooling is identical with power supply output bus.
(4) special-purpose extension fixture
Form by rolling mold pressing head, 12MPa hydraulic system, adjustable support roller and stopping means, as loudspeaker roll extrusion schematic diagram as shown in Figure 4,1 is power lathe, and 2 is chuck, and 4 are the roll extrusion oil cylinder, and 5 is the carry oil cylinder, and 6 is roller, and 8 is stopping means, and 9 is support wheel.
Roll mold pressing 6 and be the requirement design that adds the characteristics of thermal enlargement and BS534 according to port, directly contact with workpiece 3 and constantly roll extrusion downwards, the formation port is expanded; Design advances mould horizontal feed and two hydraulic systems of vertical feed, adopts solenoid control, handled easily and assurance safety, and mold pressing head location is rolled in horizontal feed control, and vertical feed mechanism drives the exposure level that rolls mold pressing head and workpiece, forces the port expansion; Support roller 9 holds up workpiece 3 and offsets major part and roll the mold pressing head and press down stressed: can be by regulating the distance between support roller 9 and the port, control horn mouth and straight length transition section length; Stopping means 8 can be observed the forming process of port and the prompting or stop vertical feed automatically of putting in place intuitively, and it is spacing to guarantee that pipe end horn mouth expansion roll extrusion puts in place, meets BS534 standard or owner's requirement.
(5) lifting appliance
Lifting workpiece, tool and mould.
3. port is expanded technical process
(1) preparation before the expansion
Steel pipe rolls;
The welding of single-unit steel pipe longitudinal seam;
Need the interior longitudinal seam of expansion port 250mm to polish;
350mm place, steel pipe two ends with stay tube reinforce, the campus;
The welded and installed connecting plate;
Clamping workpiece;
Adjust support roller 9 positions (look transition section length and determine) as accompanying drawing 2;
Check whether each joint of output line is loosening, and check its insulation situation;
The roof pressure pressure fuel pump is 12MPa, checks oil circuit whether unimpeded (closing then);
Warning region is set;
C6031A lathe preliminary operation, oil pressure is adjusted to 3Mpa, rotating speed 1.2r/min;
Adjust the induction coil position, make tube wall and the about 30mm in induction coil gap;
Induction coil water flowing 0.15-0.2Mpa test, water-tight, insulate.
(2) operation principle
According to steel pipe port expansion requirement, regulate support roller, the spacing and position (level) of rolling the mold pressing head, starting intermediate frequency power supply is heated evenly it to expanding the port heating and starting lathe simultaneously, when port is heated to 850 ℃～900 ℃, starting the roll extrusion oil pump makes and rolls the mold pressing head and vertically downward the steel pipe port is pressurizeed, steel pipe and pressure head be stressed to be contacted, equidirectional rotation, realizes the expansion to the steel pipe port.
(3) course of work
Start intermediate frequency power supply, and start 3 rotations of lathe 1 driving workpiece simultaneously;
Increase heating in medium frequency power to 550～700KW step by step, steel pipe expansion place is progressively heated up
During to 800 ℃～850 ℃, suitably reduce heating in medium frequency power;
When temperature reached 850 ℃～900 ℃, starting roll extrusion oil pump made and rolls mold pressing 6 and steel
Side contacts and to its downward pressurization in the pipe, the speed of pressing down is 3～5mm/min;
Roll extrusion is during to spacing position, and feed-disabling, lathe are rotated further three minutes, stop intermediate frequency
Heating also retracts the roll extrusion assembly;
When horn mouth temperature air cooling to about 300 ℃ the time, can dismantle workpiece and test, so far
Making work is finished.
Claims (2)
1, a kind of large diameter thick wall steel pipe end process for expanding, it is characterized in that: the end with steel pipe utilizes Frequency Induction Heating earlier, heating-up temperature is 850 degree～900 degree, adopts then by rolling the special-purpose pipe expander that mold pressing head, 12Mpa hydraulic system, adjustable support roller and stopping means form and expands system.
2, expanding end of large diameter thick wall steel pipe technology according to claim 1, it is characterized in that: lathe chuck clamping work (3) → face lathe 1 drives the inducement rotation, drives workpiece (3) rotation → Frequency Induction Heating roll extrusion workpiece end → driving oil cylinder (5) adjusting steel tube end part length → roll extrusion oil cylinder (4), support wheel (9) and stopping means (8) and accurately locatees extension mouth → roll mold pressing head (6) to workpiece (3) rolling forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99117003A CN1093444C (en) | 1999-07-23 | 1999-07-23 | Process for expanding end of large diameter thick wall steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99117003A CN1093444C (en) | 1999-07-23 | 1999-07-23 | Process for expanding end of large diameter thick wall steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1248501A CN1248501A (en) | 2000-03-29 |
| CN1093444C true CN1093444C (en) | 2002-10-30 |
Family
ID=5279652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99117003A Expired - Fee Related CN1093444C (en) | 1999-07-23 | 1999-07-23 | Process for expanding end of large diameter thick wall steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1093444C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102189189B (en) * | 2011-04-15 | 2013-04-10 | 湘潭华进科技有限公司 | High-precision thermal expanding method for high-strength steel pipes |
| CN102878355A (en) * | 2012-10-24 | 2013-01-16 | 珠海格力电器股份有限公司 | Reducing pipeline part of air conditioning system |
| CN106825271B (en) * | 2016-12-23 | 2019-01-29 | 内蒙古北方重工业集团有限公司 | The processing method that heavy caliber thick wall squeezes cast pipe mold flaring |
| CN107175287B (en) * | 2017-06-22 | 2018-12-25 | 南京理工大学 | A kind of tubular part inner circle single-point progressive molding processing unit (plant) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030036A (en) * | 1987-06-25 | 1989-01-04 | 卢成尧 | Change the hot-working method of inner and outer diameters of seamless seamless steel pipe |
| CN1042673A (en) * | 1988-11-12 | 1990-06-06 | 哈尔滨工业大学 | Large-diameter steel pipe pipe-end straightening method and device |
-
1999
- 1999-07-23 CN CN99117003A patent/CN1093444C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030036A (en) * | 1987-06-25 | 1989-01-04 | 卢成尧 | Change the hot-working method of inner and outer diameters of seamless seamless steel pipe |
| CN1042673A (en) * | 1988-11-12 | 1990-06-06 | 哈尔滨工业大学 | Large-diameter steel pipe pipe-end straightening method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1248501A (en) | 2000-03-29 |
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