CN106987770A - A kind of small-bore deep tube cavity processing technology - Google Patents
A kind of small-bore deep tube cavity processing technology Download PDFInfo
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- CN106987770A CN106987770A CN201710258102.7A CN201710258102A CN106987770A CN 106987770 A CN106987770 A CN 106987770A CN 201710258102 A CN201710258102 A CN 201710258102A CN 106987770 A CN106987770 A CN 106987770A
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- China
- Prior art keywords
- pipe
- pipe fitting
- processing technology
- small
- tube cavity
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention proposes a kind of small-bore deep tube cavity processing technology, comprises the following steps：S1：From pipe：From including following weight/mass percentage composition composition C：0.03‑0.1%、Si：0.2‑0.45%、Mn：0.5‑0.8%、P：＜ 0.02%, S：＜ 0.01%, Cu：2‑2.5%、Ni：0.12‑0.35%、Cr：0.05‑0.12%、Mo：The pipe that 0.3 0.6% melting makes；S2：Heat treatment, pipe is put into heating in sloping hearth furnace, enters 700 800 DEG C of furnace temperature, heating-up temperature is at 1,200 1250 DEG C, and insulation carries out hot piercing, forms steel pipe, pipe fitting produced by the invention, surface is fine and smooth, and intensity is big, and without chatter mark after internal diameter processing, can have good intensity, toughness, plasticity, elongation percentage, indices comply fully with requirement, bear pressure greatly, flawless.
Description
Technical field
The present invention relates to pipe fitting processing technology field, more particularly, to the small-bore deep tube cavity processing technology of one kind.
Background technology
Seamless steel pipe has hollow section, and a large amount of pipelines for being used as trandfer fluid, seamless steel pipe is to use steel ingot or solid tubes
Hollow billet is made in base perforated, and then hot rolled, cold rolling or cold group is made, wherein the steel pipe of automobile engine fuel feeding, generally
Using small-bore high-pressure oil pipe, the high pressure during use is still suffered from, the general length of present oil pipe is 4m, diameter 1.8m,
Wall thickness 5mm, for such pipe fitting, if internal diameter is processed using traditional mode, can produce substantial amounts of chatter mark and wound of uttering a sound or a word
The content of the invention
In order to solve the above technical problems, the present invention proposes a kind of small-bore deep tube cavity processing technology, including following step
Suddenly：
S1：From pipe：From including following weight/mass percentage composition composition C：0.03-0.1%, Si：0.2-0.45%,
Mn：0.5-0.8%, P：＜ 0.02%, S：＜ 0.01%, Cu：2-2.5%, Ni：0.12-0.35%, Cr：0.05-0.12%,
Mo：The pipe that 0.3-0.6% meltings make；
S2：Heat treatment, pipe is put into heating in sloping hearth furnace, and insulation carries out hot piercing, forms steel pipe；
S3：Heat treatment is taken out after finishing and is placed into cold rinse bank in pipe, 30s and is cooled down rapidly；
S4:Steel pipe raw material is carried out using high-accuracy hydraulic pressure cold drawing machine to set standard core inside accurate cold-drawn, steel pipe raw material,
Internal diameter, external diameter reach requirement after cold-drawn；
S3：Electrobrightening, the pipe fitting in S2 is taken out and is positioned in electrolytic cell, the bright and clean pipe fitting in inner chamber is obtained；
S4：Pipe fitting is fixed on fixed mount, columnar member is inserted in pipe fitting, columnar member is fitted with pipe fitting inner wall, uses height
Columnar member is carried out punching press back and forth in pipe fitting and rotated by pressure stamping machine, and shaping is carried out to pipe fitting inner wall；
S4：Inner diameter measurement, inside pipe fitting defect is checked using x-ray detection detection；
S5：Coding, packaging, storage.
It is preferred that, heating and temperature control is in 60 DEG C, voltage 9-12V, electric current 120-130A, electrolysis time in the electrolytic cell
For 5 minutes.
It is preferred that, after S2 steps, steel pipe is aligned using straightener.
It is preferred that, the sloping hearth furnace enters 700-800 DEG C of furnace temperature, and heating-up temperature is at 1200-1250 DEG C.
It is preferred that, the punching press intensity of the high pressure stamping machine is 1000MPa-2000MPa.
It is preferred that, the component of the pipe, which includes selecting, includes following weight/mass percentage composition composition C：0.02%th, Si:
0.3%th, Mn:0.6%th, P：0.01、S：0.01%th, Cu：2.25%th, Ni：0.15%th, Cr:0.1%th, Mo:0.5%.
It is preferred that, the steel pipe raw material obtains length for 4m after cold-drawn, and tube wall is 5mm, and internal diameter is 1.8m.
It is preferred that, in addition to spray painting step is carried out to pipe fitting internal diameter, take strip to spray tool and stretch in pipe fitting, rotate strip
Spray tool, is uniformly painted to inwall.
Small-bore deep tube cavity processing technology proposed by the present invention has following beneficial effect：Pipe fitting produced by the invention, table
Face is fine and smooth, and intensity is big, and without chatter mark after internal diameter processing, can have good intensity, toughness, plasticity, elongation percentage, indices
Requirement is complied fully with, pressure is born greatly, flawless.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
Embodiment 1
The present invention proposes a kind of small-bore deep tube cavity processing technology, comprises the following steps：
S1：From pipe：From including following weight/mass percentage composition composition C：0.1%th, Si：0.45%th, Mn：0.8%th, P：
0.02%th, S：0.01%th, Cu：2.5%th, Ni：0.35%th, Cr：0.12%th, Mo：The pipe that 0.6% melting makes；
S2：Heat treatment, pipe is put into heating in sloping hearth furnace, enters 700 DEG C of furnace temperature, heating-up temperature at 1200 DEG C, be incubated into
Row hot piercing, forms steel pipe；
S3：Heat treatment is taken out after finishing and is placed into cold rinse bank in pipe, 30s and is cooled down rapidly；
S4:Steel pipe raw material is carried out using high-accuracy hydraulic pressure cold drawing machine to set standard core inside accurate cold-drawn, steel pipe raw material,
Internal diameter, external diameter reach requirement after cold-drawn；
S3：Electrobrightening, the pipe fitting in S2 is taken out and is positioned in electrolytic cell, the bright and clean pipe fitting in inner chamber, the electrolytic cell
Interior heating and temperature control is at 60 DEG C, and voltage 9V, electric current 120A, electrolysis time are 5 minutes；
S4：Pipe fitting is fixed on fixed mount, columnar member is inserted in pipe fitting, columnar member is fitted with pipe fitting inner wall, uses height
Columnar member is carried out punching press back and forth by pressure stamping machine in pipe fitting, and shaping is carried out to pipe fitting inner wall；
S4：Inner diameter measurement, inside pipe fitting defect is checked using x-ray detection detection；
S5：Coding, packaging, storage.
Embodiment 2
The present invention proposes a kind of small-bore deep tube cavity processing technology, comprises the following steps：
S1：From pipe：From including following weight/mass percentage composition composition C：0.03%th, Si：0.2%th, Mn：0.5%th, P：
0.01%th, S：0.01%th, Cu：2%th, Ni：0.12%th, Cr：0.05%th, Mo：The pipe that 0.3% melting makes；
S2：Heat treatment, pipe is put into heating in sloping hearth furnace, enters 700 DEG C of furnace temperature, heating-up temperature at 1200 DEG C, be incubated into
Row hot piercing, forms steel pipe；
S3：Heat treatment is taken out after finishing and is placed into cold rinse bank in pipe, 30s and is cooled down rapidly；
S4:Steel pipe raw material is carried out using high-accuracy hydraulic pressure cold drawing machine to set standard core inside accurate cold-drawn, steel pipe raw material,
Internal diameter, external diameter reach requirement after cold-drawn；
S3：Electrobrightening, the pipe fitting in S2 is taken out and is positioned in electrolytic cell, the bright and clean pipe fitting in inner chamber, the electrolytic cell
Interior heating and temperature control is at 60 DEG C, and voltage 10V, electric current 130A, electrolysis time are 5 minutes；
S4：Pipe fitting is fixed on fixed mount, columnar member is inserted in pipe fitting, columnar member is fitted with pipe fitting inner wall, uses height
Columnar member is carried out punching press back and forth by pressure stamping machine in pipe fitting, and shaping is carried out to pipe fitting inner wall；
S4：Inner diameter measurement, inside pipe fitting defect is checked using x-ray detection detection；
S5：Coding, packaging, storage.
Embodiment 3
The present invention proposes a kind of small-bore deep tube cavity processing technology, comprises the following steps：
S1：From pipe：From including following weight/mass percentage composition composition C：0.05%th, Si：0.2%th, Mn：0.5%th, P：
0.01%th, S：0.01%th, Cu：2%th, Ni：0.3%th, Cr：0.08%th, Mo：The pipe that 0.5% melting makes；
S2：Heat treatment, pipe is put into heating in sloping hearth furnace, enters 800 DEG C of furnace temperature, heating-up temperature at 1200 DEG C, be incubated into
Row hot piercing, forms steel pipe；
S3：Heat treatment is taken out after finishing and is placed into cold rinse bank in pipe, 30s and is cooled down rapidly；
S4:Steel pipe raw material is carried out using high-accuracy hydraulic pressure cold drawing machine to set standard core inside accurate cold-drawn, steel pipe raw material,
Internal diameter, external diameter reach requirement after cold-drawn；
S3：Electrobrightening, the pipe fitting in S2 is taken out and is positioned in electrolytic cell, the bright and clean pipe fitting in inner chamber, the electrolytic cell
Interior heating and temperature control is at 60 DEG C, and voltage 12V, electric current 130A, electrolysis time are 5 minutes；
S4：Pipe fitting is fixed on fixed mount, columnar member is inserted in pipe fitting, columnar member is fitted with pipe fitting inner wall, uses height
Columnar member is carried out punching press back and forth by pressure stamping machine in pipe fitting, and shaping is carried out to pipe fitting inner wall；
S4：Inner diameter measurement, inside pipe fitting defect is checked using x-ray detection detection；
S5：Coding, packaging, storage.
In three above embodiment, the blank tube material intensity used is big and smooth, and obtained pipe fitting endurance is strong, and
Coordinate high-pressure unit to carry out flinging shaping vertically to pipe fitting inner wall using columnar member, effectively prevent the generation of chatter mark, production efficiency is high.
A variety of modifications to embodiment will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, originally
Invention is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty
Consistent most wide scope.
Claims (8)
1. a kind of small-bore deep tube cavity processing technology, it is characterised in that comprise the following steps：
S1：From pipe：From including following weight/mass percentage composition composition C：0.03-0.1%, Si：0.2-0.45%, Mn：
0.5-0.8%, P：＜ 0.02%, S：＜ 0.01%, Cu：2-2.5%, Ni：0.12-0.35%, Cr：0.05-0.12%, Mo：
The pipe that 0.3-0.6% meltings make；
S2：Heat treatment, pipe is put into heating in sloping hearth furnace, and insulation carries out hot piercing, forms steel pipe；
S3：Heat treatment is taken out after finishing and is placed into cold rinse bank in pipe, 30s and is cooled down rapidly；
S4:Steel pipe raw material is carried out using high-accuracy hydraulic pressure cold drawing machine to set standard core, cold-drawn inside accurate cold-drawn, steel pipe raw material
Internal diameter, external diameter reach requirement afterwards；
S3：Electrobrightening, the pipe fitting in S2 is taken out and is positioned in electrolytic cell, the bright and clean pipe fitting in inner chamber is obtained；
S4：Pipe fitting is fixed on fixed mount, columnar member is inserted in pipe fitting, columnar member is fitted with pipe fitting inner wall, rushed using high pressure
Columnar member is carried out punching press back and forth in pipe fitting and rotated by press, and shaping is carried out to pipe fitting inner wall；
S4：Inner diameter measurement, inside pipe fitting defect is checked using x-ray detection detection；
S5：Coding, packaging, storage.
2. small-bore deep tube cavity processing technology according to claim 1, it is characterised in that the electrolytic cell Nei Jiarewen
Degree control is at 60 DEG C, and voltage 9-12V, electric current 120-130A, electrolysis time are 5 minutes.
3. small-bore deep tube cavity processing technology according to claim 2, it is characterised in that after S2 steps, using strong
Straight machine is aligned to steel pipe.
4. small-bore deep tube cavity processing technology according to claim 1, it is characterised in that the sloping hearth furnace enters furnace temperature
700-800 DEG C of degree, heating-up temperature is at 1200-1250 DEG C.
5. small-bore deep tube cavity processing technology according to claim 1, it is characterised in that the high pressure stamping machine is rushed
Compressive Strength is 1000MPa-2000MPa.
6. small-bore deep tube cavity processing technology according to claim 1, it is characterised in that the component of the pipe includes
From including following weight/mass percentage composition composition C：0.02%th, Si:0.3%th, Mn:0.6%th, P：0.01、S：0.01%th, Cu：
2.25%th, Ni：0.15%th, Cr:0.1%th, Mo:0.5%.
7. small-bore deep tube cavity processing technology according to claim 1, it is characterised in that the steel pipe raw material is through supercooling
Length is obtained after pulling out for 4m, tube wall is 5mm, and internal diameter is 1.8m.
8. small-bore deep tube cavity processing technology according to claim 7, it is characterised in that also including entering to pipe fitting internal diameter
Row spray painting step, takes strip to spray tool and stretches in pipe fitting, rotates strip spray tool, inwall is uniformly painted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710258102.7A CN106987770B (en) | 2017-04-19 | 2017-04-19 | A kind of small-bore deep tube cavity processing technology |
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| CN201710258102.7A CN106987770B (en) | 2017-04-19 | 2017-04-19 | A kind of small-bore deep tube cavity processing technology |
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| CN106987770A true CN106987770A (en) | 2017-07-28 |
| CN106987770B CN106987770B (en) | 2018-08-14 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1149083A (en) * | 1995-10-20 | 1997-05-07 | 化学工业部湘东化工机械厂 | Low alloyed wear-resistant cast steel pipes and its casting process |
| JP2001138066A (en) * | 1999-11-17 | 2001-05-22 | Sumitomo Metal Ind Ltd | Method for producing high workability carbon steel pipe for hydroforming |
| CN101333911A (en) * | 2007-06-28 | 2008-12-31 | 张二建 | Small caliber cold-drawing oil conduit and its processing method |
| JP4281213B2 (en) * | 2000-05-11 | 2009-06-17 | 住友金属工業株式会社 | Seamless steel pipe for machine structures with excellent machinability, hot workability and toughness |
| CN101633999A (en) * | 2009-05-26 | 2010-01-27 | 山西太钢不锈钢股份有限公司 | Austenitic stainless steel, steel tube thereof and manufacturing method thereof |
| CN104962838A (en) * | 2015-06-18 | 2015-10-07 | 宝山钢铁股份有限公司 | High-strength steel, high-strength plastic seamless steel pipe for automotive driver shafts and manufacturing method of high-strength plastic seamless steel pip |
| CN104988428A (en) * | 2015-07-09 | 2015-10-21 | 张家港市圣鼎源制管有限公司 | Small-caliber high-pressure oil pipe machining process |
| JP2017008391A (en) * | 2015-06-24 | 2017-01-12 | 新日鐵住金株式会社 | Flexure electroseamed steel pipe for boiler excellent in corrosion resistance |
-
2017
- 2017-04-19 CN CN201710258102.7A patent/CN106987770B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1149083A (en) * | 1995-10-20 | 1997-05-07 | 化学工业部湘东化工机械厂 | Low alloyed wear-resistant cast steel pipes and its casting process |
| JP2001138066A (en) * | 1999-11-17 | 2001-05-22 | Sumitomo Metal Ind Ltd | Method for producing high workability carbon steel pipe for hydroforming |
| JP4281213B2 (en) * | 2000-05-11 | 2009-06-17 | 住友金属工業株式会社 | Seamless steel pipe for machine structures with excellent machinability, hot workability and toughness |
| CN101333911A (en) * | 2007-06-28 | 2008-12-31 | 张二建 | Small caliber cold-drawing oil conduit and its processing method |
| CN101633999A (en) * | 2009-05-26 | 2010-01-27 | 山西太钢不锈钢股份有限公司 | Austenitic stainless steel, steel tube thereof and manufacturing method thereof |
| CN104962838A (en) * | 2015-06-18 | 2015-10-07 | 宝山钢铁股份有限公司 | High-strength steel, high-strength plastic seamless steel pipe for automotive driver shafts and manufacturing method of high-strength plastic seamless steel pip |
| JP2017008391A (en) * | 2015-06-24 | 2017-01-12 | 新日鐵住金株式会社 | Flexure electroseamed steel pipe for boiler excellent in corrosion resistance |
| CN104988428A (en) * | 2015-07-09 | 2015-10-21 | 张家港市圣鼎源制管有限公司 | Small-caliber high-pressure oil pipe machining process |
Non-Patent Citations (1)
| Title |
|---|
| 钟倩霞等: ""我国不锈钢管市场需求及国内外不锈钢管生产技术发展趋势"", 《钢管》 * |
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