CN201161255Y - Mould for internal thread steel tube for manufacturing high pressure boiler - Google Patents
Mould for internal thread steel tube for manufacturing high pressure boiler Download PDFInfo
- Publication number
- CN201161255Y CN201161255Y CNU2007200982975U CN200720098297U CN201161255Y CN 201161255 Y CN201161255 Y CN 201161255Y CN U2007200982975 U CNU2007200982975 U CN U2007200982975U CN 200720098297 U CN200720098297 U CN 200720098297U CN 201161255 Y CN201161255 Y CN 201161255Y
- Authority
- CN
- China
- Prior art keywords
- internal
- die
- mould
- pressure boiler
- good
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Metal Extraction Processes (AREA)
Abstract
The utility model provides a die used for manufacturing an internal thread steel tube of a high-pressure boiler. The die comprises an internal die and an external die, wherein, the external die is divided into an internal hollow cylindrical transitional sleeve and an internal hollow cylindrical mold core which is closely matched with the internal hollow part of the transitional sleeve, the internal hollow part of the mold core comprises a taper internal periphery and a calibrating strap, the cone angle of the taper internal periphery is 11 degrees, the two ends of the internal hollow part of the internal die are provided with a chamfer angle; the internal die is a front, middle and rear stepped cylinder, the front part of the internal die is provided with a spiral step concave groove which has four to eight heads, and a circular chamfer angle is arranged at the internal die end part. The die has the advantages that the physical dimension of the die with the structure has high accuracy, the service life is long and the economical benefits are good. The internal die has high surface finish quality so that the die has long service life, and the steel tube has good surface quality, surface hardness and degree of finish; the manufactured internal thread tube has good internal surface convex rib height and good shape quality; every performance meets the requirements of a seamless pipe of the standard GB/T20409-2006 high-pressure boiler.
Description
Technical field
The utility model provides a kind of mould, particularly a kind of mould that is suitable for producing high-pressure boiler usefulness inner thread steel pipe.
Background technology
High-pressure boiler with riffled tube draw forming process in, steel pipe is not only arranged with respect to the moving of interior external mold, and also has internal mold to rotate with respect to the dead axle of steel pipe, compare with common short plug draw steel pipe, in the deformed area metal flow more complicated.Analysis to inner thread steel pipe draw forming process belongs to the elastoplasticity large deformation problem in theory, and because contact condition changes the problem of also having brought contact nonlinear; Inner thread steel pipe not only has the variation of diameter and wall thickness in forming process, and also has the generation of spiral convex rib at inside pipe wall, so the theory analysis of cold-drawn steel tube with internal thread forming process is very difficult.In actual production process, because the complexity of distortion, the distortion of interior muscle screw thread is inevitable.Add because that mould is made is unreasonable, technical parameters such as the riffled tube thread depth that causes producing, width can not meet the demands, and the life-span of mould is also lower.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the purpose of this utility model provides a kind of mould of high-pressure boiler with inner thread steel pipe that be suitable for producing, be beneficial to reduce muscle screw thread distortion in the steel pipe, improve die life, simultaneously the internal thread high-pressure boiler tube surface quality of producing is obviously improved.
For achieving the above object, the technical solution adopted in the utility model provides a kind of mould of high-pressure boiler with inner thread steel pipe that be suitable for producing, this mould comprises interior external mold, wherein: in described external mold is divided into the hollow cylindrical spacer shell and with described spacer shell in hollow friction tight in hollow cylindrical core rod two parts form, the interior hollow of described core rod comprises taper inner peripheral surface and calibrating strap, the cone angle of taper inner peripheral surface is 11 degree angles, and the interior hollow bulb two ends of described core rod are provided with chamfering; Described internal mold is the notch cuttype cylinder of a preceding posterior segment, is provided with the helical form trapezoidal groove that has rounded corner of 4-8 head on the leading portion periphery of described internal mold, is provided with rounded corner at the two ends of described internal mold.
The lead angle of described helical form trapezoidal groove is 30 degree angles.
Effect of the present utility model is mould size precision height, the long service life, good in economic efficiency of this structure.Internal mold reaches higher surface smoothness through operations such as machined, heat treatment, polishings, make mould that be arranged good service life, and make the steel pipe after the processing have surface quality preferably, case hardness and fineness are very high, reduce draw power, the comprehensive process cost of product is lower.Because bright and clean no burr steel pipe internal-surface fin height of internal mold surface groove and shape quality are good, every performance all satisfies the requirement of standard GB/T20409-2006 seamless steel tubes and pipes for high pressure boiler.
Description of drawings
Fig. 1 is the side view of external mold of the present utility model;
Fig. 2 is the cutaway view of the utility model external mold;
Fig. 3 is the structural representation of the utility model internal mold;
Fig. 4 is the A-A cutaway view of Fig. 3.
Among the figure:
1, spacer shell 2, core rod 3, groove
The specific embodiment
Reaching embodiment in conjunction with the accompanying drawings is suitable for producing high-pressure boiler and is illustrated with the mould structure of inner thread steel pipe of the present utility model.
Shown in Fig. 1-4, it is of the present utility model that to be suitable for producing high-pressure boiler be that this mould comprises interior external mold with the mould structure of inner thread steel pipe, described external mold is divided into interior hollow cylindrical spacer shell 1 and forms with friction tight interior hollow cylindrical core rod 2 two parts of described spacer shell 1 interior hollow, it is pyramidal structure that described core rod 2 is participated in flow of metal directly, described outside spacer shell mainly is fixing core rod, in use play shock absorbing power, prevent the core rod cracking.The interior hollow bulb of described core rod 2 comprises taper inner peripheral surface and calibrating strap h
1, the cone angle of taper inner peripheral surface is 11 degree angles, the interior hollow bulb two ends of described core rod 2 are provided with chamfering; Described internal mold is the notch cuttype cylinder of a preceding posterior segment, on the leading portion periphery of described internal mold, be provided with the helical form trapezoidal groove 3 that has rounded corner of 4-8 head, two ends at described internal mold are provided with rounded corner, to guarantee that when the draw internal mold can be brought deformed area and rotation smoothly into.The lead angle of described helical form trapezoidal groove 3 is 30 degree angles, satisfies the requirement of riffled tube lead angle.
It is of the present utility model that to be suitable for producing high-pressure boiler be to realize like this with the mould of steel pipe.
The mould of this structure is by the use of actual mould on drawbench, and effect proves that this utility model can produce the high-pressure boiler riffled tube.
The mould external mold of this structure: because internal thread steel draw double thread height has certain requirement, and the draw resistance is very big, and therefore the external mold that adopts is the inner cone pattern, as shown in Figure 2, the size of cone angle directly has influence on the size of draw power and the thread depth of riffled tube, pull out in the process in examination, the cone angle of external mold is big more, and the wall thickness reduction amount is serious more, thread depth is low more, through repeatedly experiment, getting the α value is 11 °, sizing section h
1Bigger than general tapered external mold, be beneficial to the formation of thread depth, the concrete value mould technical parameter table of regarding sb. as an outsider, the core rod material is selected carbide alloy YG 8 for use, and case hardness and fineness are very high, reduce draw power, improve the outer tube surface quality.
External mold technical parameter table (unit: mm)
Aperture core rod die sleeve calibrating strap
d
1 d
2 h
2 d
3 h
3 h
1
28～48 80 45 195 80 5
48～64 110 50 230 90 8
64～76 120 55 260 100 12
The mould inner mould of this structure: riffled tube draw, internal mold is the instrument of most critical, shown in Fig. 3,4, calculate definite relevant physical dimension parameter through corresponding theory, the margin of tolerance of mode diameter, length, recess width, Side limit angle, Side limit chamfering, termination chamfering and parameters in determining respectively, and the specification requirement of finished product moulds such as definite hardness, fineness.Final definite mold material is Cr12MoV, adopt and forge steel billet, numerically controlled lathe machined, salt bath quenching, hardening heat is 950 ℃, is incubated 2-3 hour, nitriding was handled 1.5-2.5 hour, operations such as mirror special purpose machine tool polishing obtain high-precision physical dimension, and Δ=0.03-0.05mm, high rigidity are the finished product mould of HRC=64-68, high surface finish.Characteristics are geometric accuracy height, long service life, good in economic efficiency.Internal mold reaches higher surface smoothness through operations such as machined, heat treatment, polishings, makes mould that be arranged good service life, and makes the steel pipe after the processing have surface quality preferably, and the comprehensive process cost of product is lower.
Use this mould to produce the internal thread high-pressure boiler tube of steel grade ASME 213 T12 specification 51*5.7,63.5*11 etc., steel pipe sizes and surface quality all satisfy standard-required.
Claims (2)
1, a kind of being suitable for produced the mould that high-pressure boiler is used inner thread steel pipe, and this mould comprises interior external mold, it is characterized in that:
Described external mold is divided into interior hollow cylindrical spacer shell (1) and forms with friction tight interior hollow cylindrical core rod (2) two parts of the interior hollow of described spacer shell (1), and the interior hollow bulb of described core rod (2) comprises taper inner peripheral surface and calibrating strap (h
1), the cone angle of taper inner peripheral surface (α) is 11 degree angles, the interior hollow bulb two ends of described core rod (2) are provided with chamfering; Described internal mold is the notch cuttype cylinder of a preceding posterior segment, is provided with the helical form trapezoidal groove (3) that has rounded corner of 4-8 head on the leading portion periphery of described internal mold, is provided with rounded corner at the two ends of described internal mold.
2, according to claim 1 being suitable for produced the mould that high-pressure boiler is used inner thread steel pipe, it is characterized in that: the lead angle of described helical form trapezoidal groove (3) is 30 degree angles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200982975U CN201161255Y (en) | 2007-12-04 | 2007-12-04 | Mould for internal thread steel tube for manufacturing high pressure boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200982975U CN201161255Y (en) | 2007-12-04 | 2007-12-04 | Mould for internal thread steel tube for manufacturing high pressure boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201161255Y true CN201161255Y (en) | 2008-12-10 |
Family
ID=40182199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200982975U Expired - Lifetime CN201161255Y (en) | 2007-12-04 | 2007-12-04 | Mould for internal thread steel tube for manufacturing high pressure boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201161255Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102837285A (en) * | 2011-06-24 | 2012-12-26 | 周水生 | Broken head pulling device of water pipe |
| CN105251791A (en) * | 2015-11-04 | 2016-01-20 | 衡阳鸿源管业有限公司 | Tube drawing mold |
| CN106001144A (en) * | 2016-05-31 | 2016-10-12 | 宁波德创复冷机械有限公司 | Mold and device used for producing long splines and using method |
-
2007
- 2007-12-04 CN CNU2007200982975U patent/CN201161255Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102837285A (en) * | 2011-06-24 | 2012-12-26 | 周水生 | Broken head pulling device of water pipe |
| CN105251791A (en) * | 2015-11-04 | 2016-01-20 | 衡阳鸿源管业有限公司 | Tube drawing mold |
| CN106001144A (en) * | 2016-05-31 | 2016-10-12 | 宁波德创复冷机械有限公司 | Mold and device used for producing long splines and using method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101462225B (en) | Technique for processing honing tube | |
| CN102527900B (en) | Precision forging die of gear shaft and molding method of precision forging die | |
| CN102764841B (en) | Core mold and shaping method for shaping strip annular internal reinforced rib rotary body thin-wall part | |
| CN105563046B (en) | The processing technology of accurate valve core of the electromagnetic valve | |
| CN102601151B (en) | Method for manufacturing precision combined dies by involute spline open extrusion | |
| CN101332489B (en) | Cold-forging precise forming technique of gear sleeve | |
| CN110102589B (en) | Method and apparatus for machining gear | |
| JP5296083B2 (en) | Forging a precise internal shape with a core rod | |
| CN105710273A (en) | Method for determining rotary swaging circle-feeding technological parameters of constant velocity shaft of car | |
| CN201161255Y (en) | Mould for internal thread steel tube for manufacturing high pressure boiler | |
| CN108311620B (en) | Cold rotary forging precision forming method for thin-wall deep narrow groove part | |
| CN201376007Y (en) | Cold-drawing mold for refining crystalline grains on internal surface of steel pipe | |
| CN202741657U (en) | Core mold for forming band annular internal reinforcement rib revolving thin-wall part | |
| CN203886955U (en) | Cold-drawing inner die and cold-drawing die of seamless steel pipe | |
| CN102172627B (en) | Composite insulator hardware helical groove skew rolling roll groove design method | |
| CN108607946A (en) | A kind of big specification straight bevel gear study on precision forging technology | |
| CN105499418B (en) | The reducing device and its application process of ultra-thin-wall cylindrical part | |
| CN114082803B (en) | Production process of ribbed thin-wall cladding tube and cold drawing die | |
| CN207195485U (en) | New-energy automobile slidably engages set and its back extrusion concave | |
| CN106862449B (en) | The closed die forging forging method of complete-section tunnel boring machine hobboing cutter cutter ring | |
| CN112548492B (en) | Method for manufacturing inner sleeve for fixing chassis of vehicle | |
| CN108273953A (en) | Automobile DCT speed changers input outer shaft deep hole cold forging base forming technology | |
| CN210586977U (en) | Cold-heading mould for flat-head support hexagon screw | |
| CN206604887U (en) | High accuracy, the cold-drawing molding die of the flat ellipse shape heat absorption plate core structure of high intensity | |
| CN106424490A (en) | Cold-rolling thread forming cutter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081210 |
|
| CX01 | Expiry of patent term |