CN102837162B - Method for producing thick-wall hollow valve cores of large-scale ball valves - Google Patents
Method for producing thick-wall hollow valve cores of large-scale ball valves Download PDFInfo
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Abstract
The invention discloses a method for producing thick-wall hollow valve cores of large-scale ball valves. The method comprises the following specific steps of: a. selecting a steel plate as a material; b. rolling the thick steel plate selected in the step a into a circular pipe shape so as to finally obtain a thick-wall seamed steel pipe; c. respectively chamfering the outer walls of two orifices of the steel pipe obtained in the step b into circular conical surfaces; d. pre-pressing the outer walls of the two orifices of the steel pipe obtain in the step c into arc-shaped surfaces; and e. arranging an upper die and a lower die on a press, placing the steel pipe obtained in the step d in the lower die, and combining and pressurizing the upper and lower dies to obtain a finished thick-wall hollow valve core. According to the method, the complicated computing and lofting are not required and the splicing and the welding are also not required, so that the process is markedly simplified, the process difficulty is reduced, the product precision is reliably ensured, the processing cost is reduced, and excellent technological and economical values are provided, so that the method is suitable to large-scale popularization and application.
Description
Technical field
The invention belongs to large-scale ball valve element and manufacture field, specifically, relate to a kind of method of producing large-scale ball valve thick-wall hollow spool.
Background technology
Large-scale ball valve generally refers to the valve of latus rectum DN >=300mm, and it is widely used in the fields such as petroleum transportation circuit, chemical industry, power equipment.Thick-wall hollow spool is the vitals of large-scale ball valve, and it is for the flow regime of control valve in-core fluid.At present, the thick-wall hollow spool producing large-scale ball valve generally adopts following steps: first carry out calculating on steel plate, setting-out, secondly on press according to the parts of the data mart modeling multi-disc melon flap-type of setting-out, then the parts of multi-disc melon flap-type are stitched together, form the shape of thick-wall hollow spool, finally the parts of adjacent two panels melon flap-type are welded and fixed, finally obtain thick-wall hollow spool finished product.
In process of production, we find that the production technology of existing thick-wall hollow spool is comparatively complicated, need to carry out miscellaneous calculating and setting-out, and operation is many, the precision of product is difficult to obtain Reliable guarantee, and production cost is also higher in addition, needs badly for this reason and solves the problems of the technologies described above.
Summary of the invention
Technical problem to be solved by this invention is the thick-wall hollow spool production method providing a kind of large-scale ball valve, with Simplified flowsheet, and ensures the precision of product.
Technical scheme of the present invention introduces a kind of thick-wall hollow spool production method of large-scale ball valve, and its concrete step is as follows:
A, selection, material is steel plate, and the thickness of steel plate is 50 ~ 200mm;
B, pipe crimping, the steel plate selected by step a by large-scale veneer reeling machine is rolled into circular tube shaped, then the gap at butt welding place, finally obtains heavy wall seamed steel pipe, and the latus rectum DN >=2.6m of steel pipe;
Two mouth of pipe outer walls of step b gained steel pipe are changed into taper seat by c, the rounding conical surface respectively;
D, precompressed, be first heated to 850 DEG C ~ 900 DEG C by a mouth of pipe of step c gained steel pipe, then on forcing press, the outer wall of this mouth of pipe be pressed into arcwall face; Then steel pipe is commutated, another mouth of pipe of step c gained steel pipe is heated to 850 DEG C ~ 900 DEG C, then on forcing press, the outer wall of this mouth of pipe is also pressed into arcwall face;
E, shaping, first counterdie is set on the table top of forcing press, and patrix is fixed on pressure head, and upper die and lower die are hemispherical shell structure, then the steel pipe that steps d is obtained is put into counterdie, the thick-wall hollow spool of finished product is obtained after the pressurization of upper die and lower die matched moulds, and the latus rectum DN >=500mm of gained thick-wall hollow spool, and the wall thickness of thick-wall hollow spool is 50 ~ 200mm.
Because the seamless steel pipe latus rectum DN that can buy on the market is now smaller, and generally≤800mm, so first need to obtain the satisfactory steel pipe of latus rectum.In above-mentioned processing method, the steel plate that step a selects by step b is rolled into seamed steel pipe, and obtained steel pipe drift-diameter DN >=2.6m.It should be noted that at this, do not need when manufacturing small-sized thin-walled hollow spool to adopt step a and b, only can need process purchasing on the market a ready-made seamless steel pipe.
They be then carrying out smoothly for the ease of steps d as step c, and two of steel pipe mouth of pipe outer wall chamfering taperings can at 30 ° between 45 ° and 60 °, this taper seat plays guiding, transmission of pressure.
Steps d first by two of steel pipe the mouth of pipe roughly precompressed camber faces, obtains finished product thick-wall hollow spool finally by step e.
compared with existing production technology, this production method need not carry out numerous and diverse calculating, setting-out, also need not splice and weld, so just simplify technique significantly, reduce technology difficulty, and reliably can ensure the precision of product, cut down finished cost, there is good technology and economic worth, be suitable for large-scale promotion and use.
In the present invention, in described steps d and e, the pressure of forcing press used is preferably 2000T ~ 8000T, and the pressure ratio of forcing press used is more moderate, can work the work piece into type, can avoid again that pressure is excessive causes unnecessary waste.
In above production method, step c completes on lathe or emery wheel grinding machine or beveler, and two of steel pipe mouth of pipe outer wall chamfering taperings are 30 ° to 45 °.
Certainly, under the prerequisite meeting processing request, we also can carry out completing steps c according to existing equipment at hand.In addition, two mouth of pipe outer wall chamfering tapering size to fits of steel pipe, this taper seat can play the effect of guiding, transmission of pressure well.
In the present invention, described material is preferably corrosion resistant plate.
beneficial effect: this production method need not carry out numerous and diverse calculating, setting-out, also need not splice and weld, and so just simplifies technique significantly, reduce technology difficulty, and reliably can ensure the precision of product, cut down finished cost, there is good technology and economic worth, be suitable for large-scale promotion and use.
Accompanying drawing explanation
Fig. 1 is by the change in shape schematic diagram of raw material to finished product when adopting this production method production thick-wall hollow spool.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described:
With reference to Fig. 1, a kind of thick-wall hollow spool production method of large-scale ball valve, its step is as follows successively:
A, selection, material is steel plate, and this steel plate is preferably corrosion resistant plate, and the thickness of steel plate is 50 ~ 200mm, and the latus rectum DN of the length of steel plate steel pipe needed for step b determines.
B, pipe crimping, the steel plate selected by step a by large-scale veneer reeling machine is rolled into circular tube shaped, then the gap at butt welding place, finally obtains heavy wall seamed steel pipe, and the latus rectum DN >=2.6m of steel pipe.
C, the rounding conical surface, respectively two mouth of pipe outer walls of step b gained steel pipe are changed into taper seat, and the tapering of taper seat is preferably 30 ° to 45 °.In addition, step c completes on lathe or emery wheel grinding machine or beveler.
D, precompressed, be first heated to 850 DEG C ~ 900 DEG C by a mouth of pipe of step c gained steel pipe, then on forcing press, the outer wall of this mouth of pipe be pressed into arcwall face in heating furnace.Then steel pipe is commutated, in heating furnace, another mouth of pipe of step c gained steel pipe is heated to 850 DEG C ~ 900 DEG C, then on forcing press, the outer wall of this mouth of pipe is also pressed into arcwall face.In addition, the pressure >=2000T of institute's employing forcing press in steps d.
E, shaping, first counterdie is set on the table top of forcing press, and fixes patrix on pressure head, and upper die and lower die are hemispherical shell structure.Then, a mouth of pipe of steps d gained steel pipe is put into counterdie, obtain the thick-wall hollow spool of finished product after the pressurization of upper die and lower die matched moulds, this thick-wall hollow spool is spherical shape structure, and center has via hole.Latus rectum DN >=the 500mm of above-mentioned gained thick-wall hollow center spool place via hole, and the wall thickness of thick-wall hollow spool is 50 ~ 200mm.In addition, the pressure >=2000T of forcing press used in described step e.
The foregoing is only preferred embodiment of the present invention, is not restriction with the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a thick-wall hollow spool production method for large-scale ball valve, its step is as follows:
A, selection, material is steel plate, and the thickness of steel plate is 50 ~ 200mm;
B, pipe crimping, the steel plate selected by step a by large-scale veneer reeling machine is rolled into circular tube shaped, then the gap at butt welding place, finally obtains heavy wall seamed steel pipe, and the latus rectum DN >=2.6m of steel pipe;
Two mouth of pipe outer walls of step b gained steel pipe are changed into taper seat by c, the rounding conical surface respectively;
D, precompressed, be first heated to 850 DEG C ~ 900 DEG C by a mouth of pipe of step c gained steel pipe, then on forcing press, the outer wall of this mouth of pipe be pressed into arcwall face; Then steel pipe is commutated, another mouth of pipe of step c gained steel pipe is heated to 850 DEG C ~ 900 DEG C, then on forcing press, the outer wall of this mouth of pipe is also pressed into arcwall face;
E, shaping, first counterdie is set on the table top of forcing press, and patrix is fixed on pressure head, and upper die and lower die are hemispherical shell structure, then the steel pipe that steps d is obtained is put into counterdie, the thick-wall hollow spool of finished product is obtained after the pressurization of upper die and lower die matched moulds, and the latus rectum DN >=500mm of gained thick-wall hollow spool, and the wall thickness of thick-wall hollow spool is 50 ~ 200mm.
2. the thick-wall hollow spool production method of large-scale ball valve according to claim 1, is characterized in that: the pressure >=2000T of forcing press used in described steps d and e.
3. the thick-wall hollow spool production method of large-scale ball valve according to claim 1 or 2, it is characterized in that: step c completes on lathe or emery wheel grinding machine or beveler, and two of steel pipe mouth of pipe outer wall chamfering taperings is 30 ° to 45 °.
4. the thick-wall hollow spool production method of large-scale ball valve according to claim 1, is characterized in that: described material is corrosion resistant plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210362575.9A CN102837162B (en) | 2012-09-26 | 2012-09-26 | Method for producing thick-wall hollow valve cores of large-scale ball valves |
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| CN201210362575.9A CN102837162B (en) | 2012-09-26 | 2012-09-26 | Method for producing thick-wall hollow valve cores of large-scale ball valves |
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| CN102837162B true CN102837162B (en) | 2014-12-17 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103934630B (en) * | 2013-01-18 | 2016-09-21 | 佛山市榕达厨具五金有限公司 | A kind of manufacture method of the valve body that ventilates |
| DE102013210897A1 (en) * | 2013-06-11 | 2014-12-11 | Mahle International Gmbh | Method for producing a built-up hollow valve of an internal combustion engine |
| CN103846630B (en) * | 2014-03-26 | 2016-04-06 | 中国工程物理研究院激光聚变研究中心 | A kind of thin walled metallic materials hemispherical Shell manufacture method with seam |
| CN105458627B (en) * | 2015-12-12 | 2017-12-22 | 贵州凯星液力传动机械有限公司 | A kind of processing method of high-quality interchangeability thin-walled valve element |
| CN107717345B (en) * | 2017-09-29 | 2019-03-19 | 广州小出钢管有限公司 | A kind of technique generating steel pipe of the both ends of the surface with 0.5MM or less chamfering |
| CN111015110B (en) * | 2019-12-23 | 2021-01-08 | 西部金属材料股份有限公司 | Preparation method of metal pipe fitting difficult to deform |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383944A (en) * | 2001-04-29 | 2002-12-11 | 陈鸿茂 | Ball valve forming process |
| CN101224536A (en) * | 2007-12-28 | 2008-07-23 | 浙江东南网架股份有限公司 | Processing technique of crown scraped hollow sphere |
| CN101234465A (en) * | 2008-01-22 | 2008-08-06 | 西安交通大学 | Ball valve core expansion method |
| CN102032359A (en) * | 2011-01-25 | 2011-04-27 | 张轩 | Valve core of ball valve and processing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4398897B2 (en) * | 2005-04-14 | 2010-01-13 | 株式会社勇鉄工所 | Ball valve ball manufacturing method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383944A (en) * | 2001-04-29 | 2002-12-11 | 陈鸿茂 | Ball valve forming process |
| CN101224536A (en) * | 2007-12-28 | 2008-07-23 | 浙江东南网架股份有限公司 | Processing technique of crown scraped hollow sphere |
| CN101234465A (en) * | 2008-01-22 | 2008-08-06 | 西安交通大学 | Ball valve core expansion method |
| CN102032359A (en) * | 2011-01-25 | 2011-04-27 | 张轩 | Valve core of ball valve and processing method thereof |
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