CN102862028A - Processing method of special-shaped seamless steel tube for railway maintenance locomotive frame - Google Patents
Processing method of special-shaped seamless steel tube for railway maintenance locomotive frame Download PDFInfo
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- CN102862028A CN102862028A CN2012103504858A CN201210350485A CN102862028A CN 102862028 A CN102862028 A CN 102862028A CN 2012103504858 A CN2012103504858 A CN 2012103504858A CN 201210350485 A CN201210350485 A CN 201210350485A CN 102862028 A CN102862028 A CN 102862028A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000003672 processing method Methods 0.000 title claims abstract description 17
- 230000003137 locomotive effect Effects 0.000 title claims abstract description 16
- 238000012423 maintenance Methods 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000010622 cold drawing Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention provides a processing method of a special-shaped seamless steel tube for a railway maintenance locomotive frame, wherein the processing method comprises the following steps of: hammering the head of the steel tube; step 2. cold drawing the steel tube; and step 3. normalizing the steel tube. The processing method can effectively improve the working efficiency, reduce the rejection rate and improve the yield. Furthermore, the processing method can improve the tensile strength, the yield strength and the specific elongation of the finished product so as to improve the quality of the deformed seamless steel tube.
Description
Technical field
The present invention relates to the processing method of special-shaped seamless steel pipe, be specifically related to the processing method that railway maintenance locomotive frame uses the special-shaped seamless steel pipe.
Background technology
The special-shaped seamless steel pipe is the general name of the seamless steel pipe of other cross sectional shape except pipe, the wall thickness special-shaped seamless steel pipe such as can be divided into again, do not wait wall thickness special-shaped seamless steel pipe, straighten footpath special-shaped seamless steel pipe by the difference of steel tube section geomery.The special-shaped seamless steel pipe is widely used in various structural members, instrument and component of machine, compares with pipe, and the special-shaped seamless steel pipe generally has larger the moment of inertia and modulus of section, and larger bending resistance anti-twisting property is arranged, and can greatly alleviate construction weight, saving steel.Railway maintenance locomotive frame need to adopt the special-shaped seamless steel pipe, existing manufacturer is when making railway maintenance locomotive frame with the special-shaped seamless steel pipe, usually adopt the folding head of S type or ω type during tup, but need like this main equipment, and so folding head wears only empty sinking mould, must continue processing, be exactly that so folding head is relatively wasted the head raw material in addition, reduce operating efficiency, improved scrappage, reduced yield rate; Behind Tube Drawing, usually adopt tempering process, so that the tensile strength of special-shaped seamless steel pipe, yield strength, percentage elongation are all lower, greatly reduced the quality of special-shaped seamless steel pipe.
Summary of the invention
Technical problem to be solved by this invention is to provide the processing method of railway maintenance locomotive frame with the special-shaped seamless steel pipe, can effectively increase work efficiency, reduce scrappage, improve yield rate, and can improve tensile strength, yield strength and the percentage elongation of finished product, thereby improve the quality of special-shaped seamless steel pipe.
For solving above-mentioned existing technical problem, the invention provides following scheme: the railway maintenance locomotive frame processing method of special-shaped seamless steel pipe may further comprise the steps:
Step 1: steel pipe tup;
Step 2: Tube Drawing;
Step 3: steel pipe normalizing.
As preferably, adopt in the described step 1 Methods of OFC-A on a distolateral wall of round seamless steel pipe centered by diameter the line symmetry cut off two U-shaped blooms that grade is large, make an end of steel pipe form in the circumferential direction of the circle two U-shaped breach, adopt press that the bottom of the U-shaped breach of steel pipe is pressed into the formation groove, steel pipe rotary 90 degree, be pressed into two between two U-shaped breach of the steel tube end part heads that remain blooms horizontal with press again, the afterbody of residue bloom is arc structure, then two U-shaped blooms is flattened and are welded on the head of horizontal residue bloom.The folding head of this structure has utilized raw material, has increased length, and the clamping of flat-nose pliers has improved operating efficiency when being conducive to cold-drawn, has reduced scrappage, has improved yield rate.
As preferably, the round seamless steel pipe after adopting the cold-drawn machine drawing with tup in the described step 2 is drawn into the special-shaped seamless steel pipe that the cross section is rectangle, adopts special-shaped outer mold to carry out an empty sinking moulding during cold-drawn.Namely increased operating efficiency and also controlled processing cost, so that antitorque, measuring body performance is better than steel tubes and the solid square steel of solder type, weight also is lighter than solid square steel greatly.
As preferably, special-shaped seamless steel pipe after adopting heat-treatment furnace at the bottom of 32 meters Continuous Roller to cold-drawn in the described step 3 carries out normalized treatment, 880 ~ 920 ℃ of steel pipe heat tracing temperature, heat insulating coefficient is 0.4 ~ 0.5min/mm, go out furnace temperature＞=850 ℃, behind heat-treatment furnace, install large blower fan additional air-cooled, and install the water smoke device for cooling additional and accelerate cooling, so that steel pipe is cooled to 700 ± 20 ℃, finish processing.Tensile strength, yield strength and the percentage elongation of finished product have been improved.
As preferably, steel pipe heat tracing temperature adopts 880 ℃ in the described step 3.Shorten the interval of chilling temperature, improved the efficient of cooling.
Beneficial effect:
The present invention adopts technique scheme that the processing method of railway maintenance locomotive frame with the special-shaped seamless steel pipe is provided, effectively improved operating efficiency, reduced scrappage, improved yield rate, and improved tensile strength, yield strength and the percentage elongation of finished product, thereby improved the quality of special-shaped seamless steel pipe.
The specific embodiment
The railway maintenance locomotive frame processing method of special-shaped seamless steel pipe may further comprise the steps:
Step 1: steel pipe tup;
Step 2: Tube Drawing;
Step 3: steel pipe normalizing.
Adopt in the described step 1 Methods of OFC-A on a distolateral wall of round seamless steel pipe centered by diameter the line symmetry cut off two U-shaped blooms that grade is large, make an end of steel pipe form in the circumferential direction of the circle two U-shaped breach, adopt press that the bottom of the U-shaped breach of steel pipe is pressed into the formation groove, steel pipe rotary 90 degree, be pressed into two between two U-shaped breach of the steel tube end part heads that remain blooms horizontal with press again, the afterbody of residue bloom is arc structure, then two U-shaped blooms is flattened and are welded on the head of horizontal residue bloom.Round seamless steel pipe after adopting the cold-drawn machine drawing with tup in the described step 2 is drawn into the special-shaped seamless steel pipe that the cross section is rectangle, adopts special-shaped outer mold to carry out an empty sinking moulding during cold-drawn.Special-shaped seamless steel pipe after adopting heat-treatment furnace at the bottom of 32 meters Continuous Roller to cold-drawn in the described step 3 carries out normalized treatment, 880 ℃ of steel pipe heat tracing temperature, heat insulating coefficient is 0.4 ~ 0.5min/mm, go out furnace temperature＞=850 ℃, behind heat-treatment furnace, install large blower fan additional air-cooled, and install water smoke device for cooling acceleration cooling additional, so that steel pipe is cooled to 700 ± 20 ℃, finish processing.Effectively improve operating efficiency, reduced scrappage, improved yield rate, and improved tensile strength, yield strength and the percentage elongation of finished product, thereby improved the quality of special-shaped seamless steel pipe.
Round seamless steel pipe is selected material selection specification 267*16mm, trimmed size 250*150*16mm, and its chemical composition forms satisfy Q345D.
U-shaped notch length in the step 1 from the end to the bottom＞=30cm, the opening arc width 22 ± 2cm of U-shaped breach, bottom arc width 20 ± 1cm; In the step 1 bottom of the U-shaped breach of steel pipe be pressed into form groove be pressed into Shen Du＞=8cm; The head of residue bloom is pressed into horizontal horizontal length 15 ~ 20cm in the step 1.Because the wall thickness of steel pipe is 16mm, cooling velocity reaches 1 ℃/second in the step 3.
Railway maintenance locomotive frame requires with the apparent size of special-shaped seamless steel pipe: Wan Qu Du＜=2mm/m, total Wan Qu Du＜=0.1%, the Zhi of reversing＜=2.0mm/m, the concavo-convex Du in limit＜=0.40%, bull nose R＜=2.5 times wall thickness, limit Chui Zhi Du＜=1mm; It requires far above national standard.Mechanical property requirements: tensile strength R
m＞=490Mpa, yield strength R
E1＞=345Mpa, percentage elongation A＞=24%, the subzero 20 ℃ of impact absorption energy＞=100J of low temperature, the grain size number of steel pipe is 8 ~ 9 grades, metallographic structure is ferrite and pearlite.
Specific embodiment described herein only is to the explanation for example of the present invention's spirit, those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (5)
1. railway maintenance locomotive frame is characterized in that: may further comprise the steps with the processing method of special-shaped seamless steel pipe:
Step 1: steel pipe tup;
Step 2: Tube Drawing;
Step 3: steel pipe normalizing.
2. railway maintenance according to claim 1 locomotive frame is with the processing method of special-shaped seamless steel pipe, it is characterized in that: adopt in the described step 1 Methods of OFC-A on a distolateral wall of round seamless steel pipe centered by diameter the line symmetry cut off two U-shaped blooms that grade is large, make an end of steel pipe form in the circumferential direction of the circle two U-shaped breach, adopt press that the bottom of the U-shaped breach of steel pipe is pressed into the formation groove, steel pipe rotary 90 degree, be pressed into two between two U-shaped breach of the steel tube end part heads that remain blooms horizontal with press again, the afterbody of residue bloom is arc structure, then two U-shaped blooms is flattened and are welded on the head of horizontal residue bloom.
3. railway maintenance according to claim 1 locomotive frame is with the processing method of special-shaped seamless steel pipe, it is characterized in that: the round seamless steel pipe after adopting the cold-drawn machine drawing with tup in the described step 2 is drawn into the special-shaped seamless steel pipe that the cross section is rectangle, adopts special-shaped outer mold to carry out an empty sinking moulding during cold-drawn.
4. railway maintenance according to claim 1 locomotive frame is with the processing method of special-shaped seamless steel pipe, it is characterized in that: the special-shaped seamless steel pipe after adopting heat-treatment furnace at the bottom of 32 meters Continuous Roller to cold-drawn in the described step 3 carries out normalized treatment, 880 ~ 920 ℃ of steel pipe heat tracing temperature, heat insulating coefficient is 0.4 ~ 0.5min/mm, go out furnace temperature＞=850 ℃, behind heat-treatment furnace, install large blower fan additional air-cooled, and install the water smoke device for cooling additional and accelerate cooling, so that steel pipe is cooled to 700 ± 20 ℃, finish processing.
5. railway maintenance according to claim 4 locomotive frame is with the processing method of special-shaped seamless steel pipe, and it is characterized in that: steel pipe heat tracing temperature adopts 880 ℃ in the described step 3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103504858A CN102862028A (en) | 2012-09-20 | 2012-09-20 | Processing method of special-shaped seamless steel tube for railway maintenance locomotive frame |
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| CN2012103504858A CN102862028A (en) | 2012-09-20 | 2012-09-20 | Processing method of special-shaped seamless steel tube for railway maintenance locomotive frame |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108315532A (en) * | 2018-01-12 | 2018-07-24 | 湖北新冶钢特种钢管有限公司 | Steel pipe water fog cooling means |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201161253Y (en) * | 2008-03-13 | 2008-12-10 | 朱国良 | Technique head of cold drawing steel tube |
| CN101353948A (en) * | 2007-07-27 | 2009-01-28 | 张二建 | 25Mn2 small diameter oil conduit for waste oil well secondary development and its processing method |
| CN102367550A (en) * | 2011-10-28 | 2012-03-07 | 内蒙古包钢钢联股份有限公司 | Rare-earth-containing wet H2S corrosion resisting steel pipe used in heat exchanger, and production method thereof |
| 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 |
| JP2012170982A (en) * | 2011-02-22 | 2012-09-10 | Jfe Steel Corp | Method and equipment for expanding and processing steel tube |
-
2012
- 2012-09-20 CN CN2012103504858A patent/CN102862028A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353948A (en) * | 2007-07-27 | 2009-01-28 | 张二建 | 25Mn2 small diameter oil conduit for waste oil well secondary development and its processing method |
| CN201161253Y (en) * | 2008-03-13 | 2008-12-10 | 朱国良 | Technique head of cold drawing steel tube |
| JP2012170982A (en) * | 2011-02-22 | 2012-09-10 | Jfe Steel Corp | Method and equipment for expanding and processing steel tube |
| CN102367550A (en) * | 2011-10-28 | 2012-03-07 | 内蒙古包钢钢联股份有限公司 | Rare-earth-containing wet H2S corrosion resisting steel pipe used in heat exchanger, and production method thereof |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108315532A (en) * | 2018-01-12 | 2018-07-24 | 湖北新冶钢特种钢管有限公司 | Steel pipe water fog cooling means |
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Application publication date: 20130109 |