CN102120227A - Improved cold drawing mould of seamless steel pipe and cold drawing process thereof - Google Patents
Improved cold drawing mould of seamless steel pipe and cold drawing process thereof Download PDFInfo
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- CN102120227A CN102120227A CN 201110042164 CN201110042164A CN102120227A CN 102120227 A CN102120227 A CN 102120227A CN 201110042164 CN201110042164 CN 201110042164 CN 201110042164 A CN201110042164 A CN 201110042164A CN 102120227 A CN102120227 A CN 102120227A
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Abstract
The invention discloses an improved cold drawing mould of a seamless steel pipe and a cold drawing process thereof. The improved cold drawing mould comprises a cold drawing inner mould and a cold drawing outer mould, wherein a drawhole is formed on the cold drawing outer mould; the cold drawing inner mould is sequentially divided into a guide section, a conical wall-reduction section and a cylindrical uniform-wall section along the steel pipe drawing direction; and the entire structural strength of the cold drawing mould is improved. By adopting the cold drawing mould provided by the invention to draw a GCr15 bearing steel seamless steel pipe, the extension coefficient mu[sigma] of single-pass drawing of the pipe blank can be increased; and as the extension coefficient of single-pass drawing is increased, the drawing passes for drawing the seamless steel pipe of the same specification are reduced, the drawing yield is increased, the production period is shortened, and the production cost is lowered.
Description
Technical field
The invention belongs to metal drawing mould and drawing moulding technology field thereof, relate in particular to a kind of cold-drawing seamless tube mould and improve and cold-drawing technology.
Background technology
As shown in Figure 1, the cold drawing die that is adopted in the tradition high-carbon-chromium bearing steel cold-drawing seamless tube technology is included as a cylindrical internal mold 02 and a taper external mold 01, form the processing that the distortion section is used for steel pipe is subtracted wall, tube reducing between cylindrical internal mold 02 outer wall and taper external mold 01 inwall, in the steel pipe Cold Drawing Process, cylindrical internal mold need fix the operating position by a stretching bar, and it is remained in the distortion section.Adopt existing cylindrical internal mold that the shortcoming that the high-carbon-chromium bearing steel seamless steel pipe carries out drawing processing is: because the high-carbon-chromium bearing steel steel pipe is big in drawing deformation process resistance of deformation, when using the drawing of plain cylindrical form internal mold, the draw percentage elongation is a bit larger tham μ ∑ 1.30 will produce phenomenon of rupture, it is higher to facts have proved that steel pipe pulls off rate, this just means that the steel pipe that will obtain designated length must increase the draw passage, makes the production cycle extend; And the drawing process steel pipe ruptures easily, and the operator joins the internal mold location difficulty, the length that expends time in, thus cause producing render a service low, cost is high, the production development of enterprise is had a strong impact on.
Summary of the invention
Problem to be solved by this invention just provides a kind of cold-drawing seamless tube mould and improves and cold-drawing technology, the cold drawing die overall construction intensity improves, simplify cold-drawing technology, reduce the steel pipe drawing passage to reach, shorten the production cycle, improve the purpose that production is renderd a service, energy-saving and emission-reduction reduce production costs, alleviate operator's labour intensity.
For solving the problems of the technologies described above, the present invention has at first proposed a kind of cold-drawing seamless tube mould and has improved, comprise cold-drawn internal mold and cold-drawn external mold, have draw hole on the cold-drawn external mold, it is characterized in that: described cold-drawn internal mold is divided into the equal wall section of guide section, circular cone wall-reducting section and cylinder successively along the steel pipe drawing direction.
Guide section plays the effect of stablizing draw and protection cold-drawn internal mold operate as normal; The circular cone wall-reducting section realizes that the tube reducing of steel pipe subtracts wall; The equal wall section of cylinder realizes the equal wall finishing of steel pipe; The reaction force of cold-drawn internal mold by with the frictional force of steel pipe and pipe deformation the time reaches a poised state, uses the steel pipe length of this cold-drawn internal mold drawing significantly to increase.
Further, described circular cone wall-reducting section is divided into first wall-reducting section and second wall-reducting section, and first wall-reducting section is connected with guide section, and second wall-reducting section is connected with the equal wall section of cylinder; The axial tapering of described second wall-reducting section is less than the axial tapering of first wall-reducting section.In process of tube plug drawing mill, steel pipe subtract the wall tube reducing be divided into two the step carry out, first wall-reducting section plays and once subtracts the wall effect, second wall-reducting section plays secondary and subtracts the wall effect; Compare existing cold-drawn internal mold, the tube reducing wall-reducting section length of steel pipe increases, and the impulsive force when reducing the cold-drawn internal mold and nipping avoids steel pipe once to be out of shape excessive and fracture that cause, improves the stability of steel pipe drawing; And the wearing and tearing of cold-drawn internal mold have also been reduced to a certain extent.
Further, described guide section one end and the equal wall Duan Yiduan of cylinder are equipped with the chamfering of C1～C2.Offer chamfering, make the draw of steel pipe more smooth and easy.
Further, be coated with screw rod in the described cold-drawn internal mold, cold-drawn internal mold two ends are fastened on the screw rod by strengthening pad.Cold-drawn internal mold overall construction intensity improves, and the cold-drawn internal mold is cracky not, and increase service life, reduces the production auxiliary materials cost.
Further, described cold-drawn internal mold adopts G15 tungsten alloy steel to make.This trade mark material hardness height, appearance is greasy smooth, and cold-drawn internal mold undergauge has not guaranteed to have improved the steel pipe sizes precision with the wall thickness scattered error of pipe and unit-frame steel pipe in actual the use.
The invention allows for a kind of technology of utilizing above-mentioned cold drawing die to carry out cold-drawing seamless tube, it is characterized in that comprising the steps:
1) pipe is taken the lead successively, annealing, pickling, phosphatization, saponification handles;
2) by the stretching bar cold-drawn internal mold is pushed the end of taking the lead of pipe, and send in the draw hole on the cold-drawn external mold together with the end of taking the lead of pipe;
3) the hauling machine clamping pipe end of taking the lead moves forward pipe is stretched, and that realizes pipe successively under the acting in conjunction of cold-drawn internal mold outer wall and draw hole inwall subtracts wall, tube reducing and Jun Bi, finishes the draw of first passage;
4) repeating step 1)-step 3) finishes the multi-pass draw of pipe, and the size of cold-drawn internal mold reduces with the increase of draw passage, goes out size up to specification and shape until the pipe draw.
Further, the lengthening coefficient μ ∑ in each passage draw of pipe is 1.35-1.60.
Beneficial effect of the present invention:
1, during the drawing steel pipe, the cold-drawn internal mold rear end bar that can stretch rigidly fixes, and the reaction force of cold-drawn internal mold by with the frictional force of steel pipe and pipe deformation the time reaches a poised state, stably remains on the distortion section; The stretching bar only plays the effect of cold-drawn internal mold to the working region that promote, and the bar that therefore stretches is stressed little, is difficult for breaking, and helps saving material cost;
2, cold-drawn internal mold position can be controlled and align automatically, has guaranteed that process of tube plug drawing mill is stable and carries out normally, has effectively prevented to pull off the appearance of abnormalities such as steel pipe, size fluctuation;
When 3, using existing cold drawing die drawing steel pipe, need regulate the work zone of internal mold and external mold, otherwise stress is concentrated or lengthening coefficient is excessive, the phenomenon of appearance " empty sinking or pull off " steel pipe.And cold drawing die provided by the present invention is after preparing cold-drawn external mold, cold-drawn internal mold by manufacturing technique requirent, need not specifically regulate the active section length of internal mold and external mold, can shorten the time that the operative employee adjusts mould, reduce requirement, thereby improve operating rate operative employee's drawing technique;
4, adopt cold drawing die drawing GCr15 bearing steel seamless steel pipe provided by the present invention, can increase the lengthening coefficient μ ∑ of pipe single pass draw, generally between 1.35-1.60, select, owing to increased the lengthening coefficient of single pass draw, the drawing passes of the same specification seamless steel pipe of draw reduces, and has improved the drawing lumber recovery, shortens the production cycle, has reduced production costs;
To sum up, by above-mentioned technology contents as can be known, the present invention has reached minimizing steel pipe drawing passage, has shortened the production cycle, has improved the purpose that production is renderd a service, energy-saving and emission-reduction reduce production costs, alleviate operator's labour intensity.
Description of drawings
The present invention is described further below in conjunction with accompanying drawing:
Fig. 1 is the fundamental diagram of existing cold drawing die;
Fig. 2 is the work schematic diagram of cold drawing die of the present invention;
Fig. 3 carries out the technological process table of cold-drawing seamless tube for adopting existing cold drawing die;
Fig. 4 carries out the technological process table of cold-drawing seamless tube for adopting cold drawing die of the present invention.
The specific embodiment
With reference to Fig. 2, the present invention is that a kind of cold-drawing seamless tube mould improves, comprise cold-drawn internal mold 2 and cold-drawn external mold 1, have draw hole 11 on the cold-drawn external mold 1, described cold-drawn internal mold 2 is divided into the equal wall section 24 of guide section 21, circular cone wall-reducting section and cylinder successively along steel pipe 6 drawing directions.The circular cone wall-reducting section is divided into first wall-reducting section 22 and second wall-reducting section, 23, the first wall-reducting sections 22 are connected with guide section 21, and second wall-reducting section 23 is connected with the equal wall section 24 of cylinder; The axial tapering of described second wall-reducting section 23 is less than the axial tapering of first wall-reducting section 22.In process of tube plug drawing mill, steel pipe subtract the wall tube reducing be divided into two the step carry out, first wall-reducting section 22 plays and once subtracts the wall effect, second wall-reducting section 23 plays secondary and subtracts the wall effect; Compare existing cold-drawn internal mold 2, the tube reducing wall-reducting section length of steel pipe increases, and the impulsive force when reducing cold-drawn internal mold 2 and nipping avoids steel pipe once to be out of shape excessive and fracture that cause, improves the stability of steel pipe drawing; And the wearing and tearing of cold-drawn internal mold 2 have also been reduced to a certain extent.Equal wall section 24 1 ends of guide section 21 1 ends and cylinder are equipped with the chamfering 25 of C1～C2, make the draw of steel pipe 6 more smooth and easy.Be coated with screw rod 3 in the cold-drawn internal mold 2, cold-drawn internal mold 2 two ends are fastened on the screw rod 3 by strengthening pad 4, and cold-drawn internal mold 2 is cracky not, has improved the service life of cold-drawn internal mold 2, reduces the production auxiliary materials cost.Cold-drawn internal mold 2 adopts G15 tungsten alloy steels to make, this trade mark material hardness height, and appearance is greasy smooth, and cold-drawn internal mold 2 undergauge has not guaranteed to have improved the steel pipe sizes precision with the wall thickness scattered error of pipe and unit-frame steel pipe in actual the use.
Cold-drawing seamless tube technology provided by the present invention comprises the steps:
1) pipe is taken the lead successively, annealing, pickling, phosphatization, saponification handles;
2) by the stretching bar cold-drawn internal mold is pushed the end of taking the lead of pipe, and send in the draw hole on the cold-drawn external mold together with the end of taking the lead of pipe;
3) the hauling machine clamping pipe end of taking the lead moves forward pipe is stretched, and that realizes pipe successively under the acting in conjunction of cold-drawn internal mold outer wall and draw hole inwall subtracts wall, tube reducing and Jun Bi, finishes the draw of first passage;
4) repeating step 1)-step 3) finishes the multi-pass draw of pipe, and the size of cold-drawn internal mold reduces with the increase of draw passage, goes out size up to specification and shape until the pipe draw.
In the pipe process of tube plug drawing mill, cold-drawn internal mold 2 bar 5 that need not to stretch rigidly fixes, and each axial force that acts on during the steel pipe draw on the cold-drawn internal mold 2 can balance each other certainly, and cold-drawn internal mold 2 just stably remains in the distortion section;
Act on the power on first wall-reducting section, the 22 surface unit areas, normal pressure P1 is arranged, frictional force r1; In process of tube plug drawing mill, first wall-reducting section 22 plays and once subtracts the wall effect;
Act on the power on second wall-reducting section, the 23 surface unit areas, normal pressure P2 is arranged, frictional force r2; In process of tube plug drawing mill, second wall-reducting section 23 plays secondary and subtracts the wall effect;
Act on the power on the equal wall section 24 surface unit areas of cylinder, normal pressure P is arranged, frictional force r; In process of tube plug drawing mill, the equal wall section 24 of cylinder plays finishing, all wall effects;
21 of guide sections have played the effect of stable draw and protection cold-drawn internal mold 2 operate as normal.
After finishing draw, pipe generally also needs through physics and chemistry test, carries out inside as the metal defect detection instrument and detects a flaw, and aligns afterwards, operation such as cutting, obtains production tube at last.
Contrast the characteristics that technology of the present invention is described below by a concrete draw technological process:
Fig. 3 adopts existing cold drawing die (cylindrical internal mold) to carry out the technological process table of cold-drawing seamless tube, and Fig. 4 is the technological process table that employing cold drawing die of the present invention carries out cold-drawing seamless tube, selects the pipe of same size for use, and draw is to identical process; 150 of draw quantity;
Draw result statistics:
The technology drawing fracture quantity that adopts existing cold drawing die to carry out cold-drawing seamless tube is 19, accounts for drawing lumber recovery 87.333% 12.667%, one time, internal diameter size precision scattered error 0.05mm～0.17mm, the maximum technological requirement 0.02mm that surpasses;
The technology drawing fracture quantity that adopts cold drawing die of the present invention to carry out cold-drawing seamless tube is 2 only, accounts for 1.333%, drawing lumber recovery and reaches 98.667%, and internal diameter size precision scattered error 0.03mm～0.08mm does not exceed technological requirement.
Because the high-carbon-chromium bearing steel steel pipe is big in drawing deformation process resistance of deformation, the characteristic of fracture easily, when adopting existing cold drawing die drawing, often the draw percentage elongation will produce phenomenon of rupture slightly greatly, and it is higher to facts have proved that steel pipe pulls off rate.Therefore, existing its maximum single track cold-drawn lengthening coefficient μ ∑ of cold drawing die drawing high-carbon-chromium bearing steel steel tube technology generally is no more than 1.35; Adopt cold drawing die drawing high-carbon-chromium bearing steel seamless steel pipe provided by the present invention, can increase the lengthening coefficient μ ∑ of pipe single pass draw, generally between 1.35-1.60, select, owing to increased the lengthening coefficient of single pass draw, the drawing passes of the same specification seamless steel pipe of draw reduces, and has improved the drawing lumber recovery, shortens the production cycle, has reduced production costs.
From above-mentioned contrast as can be known, through the improvement of cold drawing die and cold-drawing technology thereof, the pipe drawing passes reduces pipe lumber recovery, production tube dimensional accuracy all to be had significantly and improves, shortened the production cycle, improved produce render a service, reduction reduces production costs.
Above-mentioned test data only is not construed as limiting characteristics of the present invention for explaining and illustrating to protection domain of the present invention; The present invention also has other embodiment, and those skilled in the art can make various changes and distortion according to the present invention, only otherwise break away from spirit of the present invention, all should belong to the defined scope of claims of the present invention.
Claims (8)
1. a cold-drawing seamless tube mould improves, comprise cold-drawn internal mold (2) and cold-drawn external mold (1), have draw hole (11) on the cold-drawn external mold (1), it is characterized in that: described cold-drawn internal mold (2) is divided into the equal wall section of guide section (21), circular cone wall-reducting section and cylinder (24) successively along steel pipe (6) drawing direction.
2. a kind of cold-drawing seamless tube mould according to claim 1 improves, it is characterized in that: described circular cone wall-reducting section is divided into first wall-reducting section (22) and second wall-reducting section (23), first wall-reducting section (22) is connected with guide section (21), and second wall-reducting section (23) is connected with the equal wall section of cylinder (24); The axial tapering of described second wall-reducting section (23) is less than the axial tapering of first wall-reducting section (22).
3. a kind of cold-drawing seamless tube mould according to claim 2 improves, and it is characterized in that: equal wall section (24) one ends of described guide section (21) one ends and cylinder are equipped with the chamfering (25) of C1～C2.
4. improve according to claim 1 or 2 or 3 described a kind of cold-drawing seamless tube moulds, it is characterized in that: be coated with screw rod (3) in the described cold-drawn internal mold (2), cold-drawn internal mold (2) two ends are fastened on the screw rod (3) by strengthening pad (4).
5. improve according to claim 1 or 2 or 3 described a kind of cold-drawing seamless tube moulds, it is characterized in that: described cold-drawn internal mold (2) adopts G15 tungsten alloy steel to make.
6. a kind of cold-drawing seamless tube mould according to claim 4 improves, and it is characterized in that: described cold-drawn internal mold (2) adopts G15 tungsten alloy steel to make.
7. a technology of utilizing cold drawing die according to claim 1 to carry out cold-drawing seamless tube is characterized in that comprising the steps:
1) pipe is taken the lead successively, annealing, pickling, phosphatization, saponification handles;
2) by the stretching bar cold-drawn internal mold is pushed the end of taking the lead of pipe, and send in the draw hole on the cold-drawn external mold together with the end of taking the lead of pipe;
3) the hauling machine clamping pipe end of taking the lead moves forward pipe is stretched, and that realizes pipe successively under the acting in conjunction of cold-drawn internal mold outer wall and draw hole inwall subtracts wall, tube reducing and Jun Bi, finishes the draw of first passage;
4) repeating step 1)-step 3) finishes the multi-pass draw of pipe, and the size of cold-drawn internal mold reduces with the increase of draw passage, goes out size up to specification and shape until the pipe draw.
8. a kind of cold-drawing seamless tube technology according to claim 7 is characterized in that: the lengthening coefficient μ ∑ in each passage draw of pipe is 1.35-1.60.
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| CN 201110042164 CN102120227A (en) | 2011-02-22 | 2011-02-22 | Improved cold drawing mould of seamless steel pipe and cold drawing process thereof |
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| CN 201110042164 CN102120227A (en) | 2011-02-22 | 2011-02-22 | Improved cold drawing mould of seamless steel pipe and cold drawing process thereof |
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| CN102513388A (en) * | 2011-11-30 | 2012-06-27 | 常州盛德无缝钢管有限公司 | Manufacture method for inner-threaded steel pipe applied to supercritical or ultra supercritical fossil power unit |
| 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 |
| CN104384227A (en) * | 2014-11-06 | 2015-03-04 | 芜湖鑫力管道技术有限公司 | One-step inner molding die tooling assembly for composite copper pipe |
| CN104985010A (en) * | 2015-07-09 | 2015-10-21 | 张家港市圣鼎源制管有限公司 | Internal mould for high-pressure oil pipe |
| CN105251791A (en) * | 2015-11-04 | 2016-01-20 | 衡阳鸿源管业有限公司 | Tube drawing mold |
| CN105344814A (en) * | 2015-11-13 | 2016-02-24 | 重庆市迈鸿食品有限公司 | Pipe die structure |
| CN105344815A (en) * | 2015-11-13 | 2016-02-24 | 重庆市迈鸿食品有限公司 | Die |
| CN107710525A (en) * | 2015-12-31 | 2018-02-16 | 深圳市大富方圆成型技术有限公司 | A kind of apparatus and method for manufacturing flat metal tube |
| CN108126994A (en) * | 2017-07-27 | 2018-06-08 | 中国航发哈尔滨东安发动机有限公司 | A kind of thin-wall aluminum alloy tube-drawing mold |
| CN108971248A (en) * | 2018-09-10 | 2018-12-11 | 江阴市洪腾机械有限公司 | A kind of inner die for cold-drawn process for eliminating steel pipe inside spin |
| CN112620369A (en) * | 2020-12-01 | 2021-04-09 | 上海浦营金属科技有限公司 | Processing device for high-performance stainless steel seamless steel pipe |
| CN112692086A (en) * | 2020-12-28 | 2021-04-23 | 东莞市竹菱铜业有限公司 | High-precision wall-reducing and diameter-reducing disc drawing machine |
| CN113351664A (en) * | 2021-06-03 | 2021-09-07 | 无锡广兴东茂科技有限公司 | Special-shaped steel drawing method and drawing device |
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| CN116511272A (en) * | 2023-03-13 | 2023-08-01 | 苏州华创特材股份有限公司 | Cold drawing die and cold drawing production process for seamless special-shaped tube |
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| CN102513388A (en) * | 2011-11-30 | 2012-06-27 | 常州盛德无缝钢管有限公司 | Manufacture method for inner-threaded steel pipe applied to supercritical or ultra supercritical fossil power unit |
| 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 |
| CN104384227A (en) * | 2014-11-06 | 2015-03-04 | 芜湖鑫力管道技术有限公司 | One-step inner molding die tooling assembly for composite copper pipe |
| CN104985010A (en) * | 2015-07-09 | 2015-10-21 | 张家港市圣鼎源制管有限公司 | Internal mould for high-pressure oil pipe |
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| CN105344815A (en) * | 2015-11-13 | 2016-02-24 | 重庆市迈鸿食品有限公司 | Die |
| CN107710525B (en) * | 2015-12-31 | 2019-06-21 | 深圳市大富方圆成型技术有限公司 | A kind of device and method manufacturing flat metal tube |
| CN107710525A (en) * | 2015-12-31 | 2018-02-16 | 深圳市大富方圆成型技术有限公司 | A kind of apparatus and method for manufacturing flat metal tube |
| CN108126994A (en) * | 2017-07-27 | 2018-06-08 | 中国航发哈尔滨东安发动机有限公司 | A kind of thin-wall aluminum alloy tube-drawing mold |
| CN108971248A (en) * | 2018-09-10 | 2018-12-11 | 江阴市洪腾机械有限公司 | A kind of inner die for cold-drawn process for eliminating steel pipe inside spin |
| CN112620369A (en) * | 2020-12-01 | 2021-04-09 | 上海浦营金属科技有限公司 | Processing device for high-performance stainless steel seamless steel pipe |
| CN112692086A (en) * | 2020-12-28 | 2021-04-23 | 东莞市竹菱铜业有限公司 | High-precision wall-reducing and diameter-reducing disc drawing machine |
| CN112692086B (en) * | 2020-12-28 | 2024-04-09 | 广东大竹菱新材料科技有限公司 | High-precision wall-reducing and diameter-reducing disc drawing machine |
| CN113351664A (en) * | 2021-06-03 | 2021-09-07 | 无锡广兴东茂科技有限公司 | Special-shaped steel drawing method and drawing device |
| CN113452215A (en) * | 2021-08-09 | 2021-09-28 | 永济德耐电气机械有限公司 | Preparation method of stator punching sheet fixing key of direct-drive wind driven generator |
| CN113452215B (en) * | 2021-08-09 | 2022-08-19 | 永济德耐电气机械有限公司 | Preparation method of stator punching sheet fixing key of direct-drive wind driven generator |
| CN116511272A (en) * | 2023-03-13 | 2023-08-01 | 苏州华创特材股份有限公司 | Cold drawing die and cold drawing production process for seamless special-shaped tube |
| CN116511272B (en) * | 2023-03-13 | 2023-10-20 | 苏州华创特材股份有限公司 | Cold drawing die and cold drawing production process for seamless special-shaped tube |
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Application publication date: 20110713 |