CN201376007Y - Cold-drawing mold for refining crystalline grains on internal surface of steel pipe - Google Patents
Cold-drawing mold for refining crystalline grains on internal surface of steel pipe Download PDFInfo
- Publication number
- CN201376007Y CN201376007Y CN200920069016U CN200920069016U CN201376007Y CN 201376007 Y CN201376007 Y CN 201376007Y CN 200920069016 U CN200920069016 U CN 200920069016U CN 200920069016 U CN200920069016 U CN 200920069016U CN 201376007 Y CN201376007 Y CN 201376007Y
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- steel pipe
- mold
- cold
- diameter cylinder
- cylinder core
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 238000010622 cold drawing Methods 0.000 title claims abstract description 26
- 238000007670 refining Methods 0.000 title abstract description 6
- 239000013078 crystal Substances 0.000 claims description 14
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005097 cold rolling Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000010137 moulding (plastic) Methods 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 abstract 1
- 238000007254 oxidation reaction Methods 0.000 abstract 1
- 230000003026 anti-oxygenic effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The utility model relates to a cold-drawing steel pipe mold, belonging to the cold-rolling/cold-drawing seamless steel pipe production of the metal plastic molding field. A cold-drawing mold for refining crystalline grains on the internal surface of the steel pipe comprises an external mold and an internal mold, wherein one end of the internal mold is fixedly connected with a pull rod; the internal surface of the external mold consists of a round table shape and a straight hole shape, and the small hole end of the round table shape is connected with the straight hole shape; the external surface of the internal mold consists of a big-diameter cylinder core rod, a small-diameter cylinder core rod and a step; the step is connected with the two cylinder core rods with different diameters, and the step is in arc connection with the two cylinder core rods; the small-diameter cylinder core rod is fixedly connected with the pull rod; and the diameter of the straight hole shape of the external mold is bigger that that of the big-diameter cylinder core rod of the internal mold. For the cold-drawing steel pipe mold, the internal surface of the steel pipe is largely deformed, and the refining effect of the crystalline grains on the internal surface of the steel pipe, so as to improve the oxidation resistance and the vapor corrosion resistance of the steel pipe product.
Description
Technical field
The utility model relates to a kind of cold drawing steel tube mould, belongs to the cold rolling/solid drawn tube production of field of metal plastic shaping.
Background technology
For the steel pipes that the table antioxygenic property has high requirements in steel pipe such as boiler tube, inner surface has fine grained texture, is very favorable for the antioxygenic property and the anti-steam corrosion performance that improve product.At present in order to show crystal grain in the refinement, thereby improve table antioxygenic property in the steel pipe, can be by the such mechanical processing method of interior peening, but ball blasting method can only be at the lower steel grade of intensity, and complex process, production efficiency is low, cost is high.
Produce for solid drawn tube, existing cold drawing steel tube mould has two kinds.A kind of is general formula steel pipe cold drawing die, and it is made up of taper external mold and cylindricality plug, thus the big refinement appearance crystal grain of steel pipe appearance deformation rate in Cold Drawing Process, interior table deformation rate is very little, and interior table crystal grain does not almost change.Another kind is the Chinese style cold drawing die, it is made up of arc external mold and conic mandrel bar, steel pipe is in process of tube plug drawing mill, interior table can obtain certain machining deformation, but for table crystal grain DeGrain in the refinement steel pipe, its drawbench load is big simultaneously, and internal mold is easy to generate fracture, and the maximum percentage elongation of Chinese style cold drawing die draw steel pipe is less simultaneously.
The utility model content
The purpose of this utility model is to provide the cold drawing die of table crystal grain in a kind of refinement steel pipe, this cold drawing die is by carrying out large deformation to the steel pipe endosexine, the table grain refining effect is obvious in the steel pipe, thereby the antioxygenic property and the anti-steam corrosion performance of tube product have been improved, simultaneously with respect to traditional Chinese style cold drawing die, can increase the maximum percentage elongation of steel pipe, improve die life.
The utility model is achieved in that the cold drawing die of table crystal grain in a kind of refinement steel pipe, comprises external mold and internal mold, the affixed pull bar of internal mold one end, and described external mold inner surface is made up of truncated cone-shaped and straight hole shape, and the truncated cone-shaped small bore end connects straight hole shape; The internal mold outer surface is made up of major diameter cylinder plug, minor diameter cylinder plug and step, and step connects the cylinder plug of two sections different-diameters, and between step and two the cylinder plugs for the circular arc connection, at the affixed pull bar of minor diameter cylinder plug end; External mold straight hole shape diameter is greater than the diameter of internal mold major diameter cylinder plug.
Described step is round table-like, and the step angle is between 30～60 degree, and shoulder height is 0.3～1mm.
The utility model makes steel pipe in cold-drawn by changing the structure of existing cold drawing die, and the thick layer generation large deformation of table 0.5mm-1.5mm obtains certain thickness grain refinement layer in the steel pipe, thereby improves the antioxygenic property of table in the steel pipe.
Cold drawing die of the present utility model is compared with existing general formula mould, increasing angle on the internal mold between 30～60 degree, it highly is the step of 0.3～1mm, large deformation is carried out in the steel pipe endosexine, table obtains the thin crystal layer that thickness is 30-300 μ m in making, thereby improves the antioxygenic property and the anti-steam corrosion performance of product.Compare with existing Chinese style mould, the utility model has increased the drawbench load limitedly, reached the effect of table crystal grain in the refinement, and it is because very big in the thick layer deformation rate of interior table 0.5mm-1.5mm, grain refining effect is more obvious, with respect to the Chinese style cold drawing die, increase the maximum percentage elongation of steel pipe simultaneously, improved die life.
Description of drawings
Fig. 1 is the cold drawing die structural representation of table crystal grain in the utility model refinement steel pipe;
Fig. 2 is the cold drawing die internal mold step place structure enlarged diagram among Fig. 1;
Fig. 3 shows metallograph in the steel pipe after embodiment 1 cold-drawn.
Among the figure: 1 external mold, 2 internal molds, 3 pull bars, 4 steel pipes, 21 major diameter cylinder plugs, 22 minor diameter cylinder plugs, 23 steps.
The specific embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, Fig. 2, the cold drawing die of table crystal grain comprises external mold 1 and internal mold 2 in a kind of refinement steel pipe, and external mold 1 inner surface is made up of truncated cone-shaped and straight hole shape, and the truncated cone-shaped small bore end connects straight hole shape, and the junction is an arc-shaped transition; Internal mold 2 outer surfaces are made up of major diameter cylinder plug 21, minor diameter cylinder plug 22 and step 23, step 23 connects the cylinder plug 21,22 of two sections different-diameters, and between step 23 and two the cylinder plugs 21,22 for circular arc connects, at the affixed pull bar 3 of minor diameter cylinder plug 22 ends; External mold 1 straight hole shape diameter is greater than the diameter of internal mold 2 major diameter cylinder plugs 21.Described step 23 is round table-like, and step 23 angles are between 30～60 degree, and step 23 highly is 0.3～mm.It below is a specific embodiment.
The utility model is by carrying out large deformation to the steel pipe endosexine, and the table grain refining effect is obvious in the steel pipe, thereby has improved the antioxygenic property and the anti-steam corrosion performance of tube product, has increased the maximum percentage elongation of steel pipe simultaneously, has improved die life.
Claims (2)
1, the cold drawing die of table crystal grain in a kind of refinement steel pipe comprises external mold and internal mold, and the affixed pull bar of internal mold one end is characterized in that: the external mold inner surface is made up of truncated cone-shaped and straight hole shape, and the truncated cone-shaped small bore end connects straight hole shape; The internal mold outer surface is made up of major diameter cylinder plug, minor diameter cylinder plug and step, and step connects the cylinder plug of two sections different-diameters, and between step and two the cylinder plugs for the circular arc connection, at the affixed pull bar of minor diameter cylinder plug end; External mold straight hole shape diameter is greater than the diameter of internal mold major diameter cylinder plug.
2, the cold drawing die of table crystal grain in the refinement steel pipe according to claim 1, it is characterized in that: described step is round table-like, and the step angle is between 30～60 degree, and shoulder height is 0.3～1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920069016U CN201376007Y (en) | 2009-03-18 | 2009-03-18 | Cold-drawing mold for refining crystalline grains on internal surface of steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920069016U CN201376007Y (en) | 2009-03-18 | 2009-03-18 | Cold-drawing mold for refining crystalline grains on internal surface of steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201376007Y true CN201376007Y (en) | 2010-01-06 |
Family
ID=41516101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920069016U Expired - Fee Related CN201376007Y (en) | 2009-03-18 | 2009-03-18 | Cold-drawing mold for refining crystalline grains on internal surface of steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201376007Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823083A (en) * | 2010-04-29 | 2010-09-08 | 浙江伦宝金属管业有限公司 | External mould assembly for cold-drawing pipes |
| CN102423770A (en) * | 2011-11-22 | 2012-04-25 | 西北工业大学 | A pipe drawing forming method and forming die |
| CN102632093A (en) * | 2012-04-01 | 2012-08-15 | 徐州徐工液压件有限公司 | Steel pipe cold-drawing mould with twice-reducing and twice-shaping functions |
| WO2013053003A1 (en) * | 2011-10-11 | 2013-04-18 | Monash University | Strengthened metal tubes |
| CN109070166A (en) * | 2016-02-01 | 2018-12-21 | 日进制钢株式会社 | Drawing mandrel |
-
2009
- 2009-03-18 CN CN200920069016U patent/CN201376007Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823083A (en) * | 2010-04-29 | 2010-09-08 | 浙江伦宝金属管业有限公司 | External mould assembly for cold-drawing pipes |
| WO2013053003A1 (en) * | 2011-10-11 | 2013-04-18 | Monash University | Strengthened metal tubes |
| CN102423770A (en) * | 2011-11-22 | 2012-04-25 | 西北工业大学 | A pipe drawing forming method and forming die |
| CN102423770B (en) * | 2011-11-22 | 2013-07-17 | 西北工业大学 | Tube drawing forming method and forming mould |
| CN102632093A (en) * | 2012-04-01 | 2012-08-15 | 徐州徐工液压件有限公司 | Steel pipe cold-drawing mould with twice-reducing and twice-shaping functions |
| CN102632093B (en) * | 2012-04-01 | 2014-11-26 | 徐州徐工液压件有限公司 | Steel pipe cold-drawing mould with twice-reducing and twice-shaping functions |
| CN109070166A (en) * | 2016-02-01 | 2018-12-21 | 日进制钢株式会社 | Drawing mandrel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100106 Termination date: 20160318 |