CN110405023A - A kind of pipeline heat treatment process - Google Patents
A kind of pipeline heat treatment process Download PDFInfo
- Publication number
- CN110405023A CN110405023A CN201910775423.3A CN201910775423A CN110405023A CN 110405023 A CN110405023 A CN 110405023A CN 201910775423 A CN201910775423 A CN 201910775423A CN 110405023 A CN110405023 A CN 110405023A
- Authority
- CN
- China
- Prior art keywords
- tubing
- punching press
- nozzle
- curved
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
Abstract
The invention discloses a kind of pipeline heat treatment process, belong to pipeline processing technical field, specifically includes the following steps: pipe feeding, tubing carry out carrying out prebuckling after 450 DEG C of high tempering processing, repair curved punching press, 800 DEG C of normalized treatments, the punch forming of pipe nozzle, carburizing and quenching, high tempering, the present invention repairs the molding punching press of curved and pipe nozzle using pipeline heat treatment process combination pipeline, realize the processing of small crooked pipeline, thinning is smaller at pipe bending after processing, and thickness is met the requirements；High tempering is used before punching press, is reduced the internal stress generated inside tubing, is improved the moulding and toughness of tubing, improve its punching performance；And punch process has a pipe nozzle, and pipe nozzle is convenient for installing when pipeline use, enhances pipeline strength, and can reduce when quenching carburizing after punching press, prevents the pipeline amount of being deformed of being heated excessive.
Description
Technical field
The present invention relates to pipeline processing technology field, in particular to a kind of pipeline heat treatment process.
Background technique
It is different according to the processing method of pipe bending, cold bending and hot-bending bends can be divided into, cold bending is straight to production tube
Connect the angle that force bends to design requirement；And hot-bending bends are heated to steel pipe, are then carried out bending deformation, are reached design
It is required that bending angle, since hot procedure can effectively reduce influence of the bending deformation to steel tube performance, thus fire bending
For bend pipe more suitable for the manufacture of larger angle bend pipe, application range is more extensive.
In the prior art, be limited in using existing for cold bending technique, bending radius should be twice of pipe diameter with
On, for example, 90 degree of attainable minimum bending radius of institute of bending are about 20 ~ 30mm, when pipeline is straight when pipe diameter is 10mm
When diameter is 20mm, 90 degree of attainable minimum bending radius of institute of bending are about 40 ~ 50mm；I.e. caliber is bigger, and when bending can reach
The minimum bending radius arrived is bigger.In addition, also bond length influences by bending for pipe bending processing, bond length is shorter, due to
It is influenced by bending machine and clamping device, cannot achieve bending machining.
But in some special equipments, especially vehicle-mounted special equipment, such as fracturing unit truck etc., due to the limit of upper dress layout
System, excessive bending radius can occupy excessive space, are unable to satisfy medium conveying again using the less pipe of caliber and require.Therefore,
Such equipment needs a kind of caliber relatively large, the relatively small bend pipe of bending radius, and the bond length of bend pipe often compared with
It is short, processing difficulties.Existing cold bending and hot-bending bends can not produce such pipeline, and the prior art mostly uses greatly casting and welding
Method produce such pipeline, using casting since its die sinking is difficult, need to separately cast from central axes, then welded
Finishing etc. is connect, yield rate is extremely low, and production cost is very high, using progressive method, needs accurate blanking, each to make
Segment is linked to be satisfactory bend pipe, is welded easily in addition and there are the faults in material such as lack of penetration, and it is larger to scrap probability, time-consuming consumption
Power, blanking is processed when being suitble to the zero of single elbow.
Conventional pipeline due to being limited by angle pipe equipment, bond length it is shorter can not bending, and small radius bend can be made
At outside tube wall thinning 20% or more, it is unable to satisfy requirement, also rarely has the bender of small-bend radius pipeline in the prior art
Skill, the pipeline heat treatment process for especially punching press being combined to carry out to reduce the radius bend of tubing, and meet wall thickness and intensity is wanted
It asks.
Summary of the invention
In order to solve the problems in the existing technology, the present invention provides a kind of pipeline heat treatment process, it is intended to solve:
The technical solution adopted by the invention is as follows:
A kind of pipeline heat treatment process, which comprises the following steps:
Step 1: tubing raw material are completed blanking by cutting length interception by pipe feeding；
Step 2: blanking tubing is carried out in 450 DEG C of electric furnace high tempering processing, is rolled over again later by tubing prebuckling
Curved, shorter after bending is short side on one side；
Step 3: repairing curved punching press, and tubing is placed on punching press pedestal；Curved component is repaired in selection, is rushed to tubing short side knee
Pressure shortens the bending radius of tubing after punching press；
Step 4: normalized treatment, the tubing after brake forming keep the temperature 1 ~ 2 hour in electric furnace in 800 DEG C of electric furnace, it is laggard
Row is air-cooled；
Tubing short side is flared to pre-set dimension by step 5, pipe nozzle punch forming with nozzle component punching press tubing short side is expanded；With platform
Rank formed punch continues punching press tubing short side, tubing short side annular protrusion；With the convex annular of nozzle molding assembly punching press tubing short side again
It rises, increases tube annular protrusion, complete punch forming；
Step 6: tubing is warming up to 900 DEG C of progress carburizing and quenching processing by carburizing and quenching, wherein Quenching Oil when quenching is cooling
Slot stirring is in close state；
Step 7: high tempering after punching press, tubing is placed in 500 DEG C of electric furnace and keeps the temperature 1 ~ 2 hour, carried out later air-cooled.
Further, quenching oil employed in the step 6 is overspeed quenching oil, and overspeed quenching oil is at 40 DEG C
Kinematic viscosity is 13 ~ 21mm2/s.
Further, quenching oil of the overspeed quenching oil used in the step 6 in entire carburizing and quenching treatment process
Temperature is 20 ~ 80 DEG C.
Further, punching press pedestal described in step 3 includes support base, bend pipe mould and locating slot, the bend pipe mould
It is fixed on support base, the bend pipe mould upper end is provided with bend pipe type groove；It is described to repair curved component including repairing curved red seat, repairing curved mould
Have, repair curved inner punch and the first positioning column, it is described repair curved inner punch and be fixed on repair on curved red seat, the bending mould end face of repairing is provided with
Bore of the punch and semi-circular groove, it is described to repair curved inner punch across the bore of the punch, the semi-circular groove axis direction and formed punch hole axle
Line orthorhombic phase passes through, and mutually the place of passing through is circular arc；Described to repair curved red seat and be further fixed on two first positioning columns, the bending mould of repairing also is opened
There are two location hole, first positioning column passes through the location hole.
Further, described in step 5 expansion nozzle component include expand nozzle red seat, expand nozzle shell, expand nozzle inner punch and second
Positioning column, the expansion nozzle shell, which is set in, to be expanded on nozzle inner punch, and the expansion nozzle inner punch is cylinder step structure, and front end is equipped with
Annular protrusion.
Further, nozzle molding assembly described in step 5 includes molding red seat, molded housing, molding inner punch and third
Positioning column, the molded housing are set on molding inner punch, and the molding inner punch includes column core, is equipped on the outside of the column core
Guiding punching set, the guiding punching set internal diameter is greater than column core diameter, and guiding punching set internal diameter front end is equipped with chamfering.
The beneficial effects of the present invention are:
The present invention combines the scheme of punching press using heat treatment, realizes the processing of small crooked pipeline, becomes at pipe bending after processing
Thin amount is smaller, and thickness is met the requirements；High tempering is used before punching press, is reduced the internal stress generated inside tubing, is improved tubing
Moulding and toughness improve its punching performance；And punch process has pipe nozzle, and pipe nozzle is convenient for installing when pipeline use, enhances pipeline
Intensity, and can reducing when quenching carburizing after punching press prevents the pipeline amount of being deformed of being heated excessive.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is process flow diagram of the invention；
Fig. 2 is that the present invention repairs curved punching press associated component structural schematic diagram；
Fig. 3 is component infrastructure schematic diagram when the present invention has repaired punching press；
Fig. 4 repairs bending mould bottom substance schematic diagram for of the invention；
Fig. 5 is that the present invention expands nozzle punching press associated component structural schematic diagram；
Fig. 6 is structural schematic diagram of the present invention without the expansion nozzle component for expanding nozzle shell；
Fig. 7 is component infrastructure schematic diagram when the present invention expands nozzle punching press；
Fig. 8 is the structural schematic diagram of nozzle molding assembly of the present invention without molded housing；
Fig. 9 is component infrastructure schematic diagram when nozzle of the present invention forms punching press；
Figure 10 is the pipe structure schematic diagram after processing.
In figure, 1, punching press pedestal；1-1, support base；1-2, bend pipe mould；1-3, locating slot；2, curved component is repaired；2-1, it repairs
Curved red seat；2-2, bending mould is repaired；2-3, curved inner punch is repaired；2-4, the first positioning column；3, bore of the punch；4, semi-circular groove；5, it positions
Hole；6, expand nozzle component；6-1, expand nozzle red seat；6-2, expand nozzle shell；6-3, expand nozzle inner punch；6-4, the second positioning column；7, nozzle at
Type component；7-1, molding red seat；7-2, molded housing；7-3, molding inner punch；7-4, third positioning column；7-5, column core；7-6 is led
It is covered to punching.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
A kind of present invention pipeline heat treatment skill is described in detail below in conjunction with attached drawing.
As shown in Figure 1, the present invention provides a kind of pipeline heat treatment process, which comprises the following steps:
Step 1: tubing raw material are completed blanking by cutting length interception by pipe feeding；
Step 2: blanking tubing is carried out in 450 DEG C of electric furnace high tempering processing, is rolled over again later by tubing prebuckling
Curved, shorter after bending is short side on one side；The purpose of step 2 is to eliminate generation inside tubing in blanking and bending process
Internal stress improves the moulding and toughness of tubing, improves its punching performance.
Step 3: repairing curved punching press, and as shown in Figures 2 and 3, tubing is placed on punching press pedestal；Curved component is repaired in selection, to pipe
Material short side knee carries out punching press, shortens the bending radius of tubing after punching press；
Step 4: normalized treatment, the tubing after brake forming keep the temperature 1 ~ 2 hour in electric furnace in 800 DEG C of electric furnace, it is laggard
Row is air-cooled；Step 4 can make the material structure of tubing uniform, increase intensity and toughness.
With nozzle component punching press tubing short side is expanded, tubing short side is flared as illustrated in figs. 5-7 for step 5, pipe nozzle punch forming
To pre-set dimension；Continue punching press tubing short side, tubing short side annular protrusion with step formed punch；With nozzle molding assembly impact tube again
The annular protrusion of material short side increases tube annular protrusion, completes punch forming；
Step 6: tubing is warming up to 900 DEG C of progress carburizing and quenching processing by carburizing and quenching, wherein Quenching Oil when quenching is cooling
Slot stirring is in close state；Specifically, used quenching oil is overspeed quenching oil, movement of the overspeed quenching oil at 40 DEG C
Viscosity is 13 ~ 21mm2/s；Quenching oil temperature of the overspeed quenching oil in entire carburizing and quenching treatment process is 20 ~ 80 DEG C；
Oil groove stirring is in close state when quenching cooling, i.e., cooling by the way of being stirred when quenching cooling without oil groove
Even if period oil temperature increases, it is also able to satisfy the requirement that defined quenching oil temperature is 20~80 DEG C, does not influence the quenching quality of product,
Cooling velocity can also be slowed down, pipeline temperature distortion can be made to be greatly improved.
It needs to illustrate, quenching oil used in step 6 is overspeed quenching oil, and kinematic viscosity is 13 at 40 DEG C
~21mm2/ S, 21~29mm of relatively rapid quenching oil kinematic viscosity215~35mm of/S and conventional quenching oil kinematic viscosity2/ S is small very
It is more, that is to say, that under equal conditions, the overspeed quenching oil quenching intensity is big, i.e., cooling rate is fast.Cooling rate is too fast, generated thermal stress
Greatly, meanwhile, the asynchronism performance of each site tissue transformation of product becomes apparent, and structural stress is also big.Moreover, stirring power mentions
High quenching medium quenching intensity, i.e. cooling capacity, moreover, replacement quenching oil is at high cost, and uneconomical also there is no more
Good quenching oil is replaced, and is based on this, cold by the way of being stirred when quenching cooling without oil groove in the present embodiment
Even if oil temperature increases during but, it is also able to satisfy the requirement that navigation mark defined quenching oil temperature is 20~80 DEG C, does not influence quenching for product
Fiery quality can also slow down cooling velocity.
Step 7: high tempering after punching press, tubing is placed in 500 DEG C of electric furnace and keeps the temperature 1 ~ 2 hour, is carried out later empty
It is cold.
As shown in Fig. 2, the punching press pedestal 1 in step 3 includes support base 1-1, bend pipe mould 1-2 and locating slot 1-3, institute
It states bend pipe mould 1-2 to be fixed on support base 1-1, the upper end bend pipe mould 1-2 is provided with bend pipe type groove；
More specifically, as shown in Fig. 2, the curved component 2 of repairing in step 3 includes repairing curved red seat 2-1, repairing bending mould 2-2, repair in curved
Formed punch 2-3 and the first positioning column 2-4 is repaired on curved red seat 2-1 specifically, repairing curved inner punch 2-3 and being fixed on, as shown in figure 4, repairing curved
The end face mold 2-2 is provided with bore of the punch 3 and semi-circular groove 4, repairs curved inner punch 2-3 and passes through the bore of the punch 3 repaired on bending mould 2-2, institute
It states 4 axis direction of semi-circular groove mutually to pass through with 3 axis vertical take-off of bore of the punch, and mutually the place of passing through is circular arc；In addition, it is also solid to repair curved red seat 2-1
Surely there are two first positioning column 2-4, repair bending mould 2-2 and also open there are two location hole 5, repair the first positioning column 2-4 of curved red seat 2-1
It is inserted into the locating slot 1-3 on bend pipe mould 1-2 across the end of location hole 5, and the first positioning column 2-4.
Step 3 specifically includes following process: the good tubing of prebuckling (bending radius is larger) being placed on bend pipe mould first
In the bend pipe type groove of the upper end 1-2, it then will repair bending mould 2-2 and be placed on the top bend pipe mould 1-2, and the lower part curved red seat 2-1 will be repaired
Repair curved inner punch 2-3 and the first positioning column 2-4 is inserted into respectively in bore of the punch 3 and location hole 5, wherein the first end positioning column 2-4
In the locating slot 1-3 of end insertion punching press pedestal 1, as shown in figure 3, lower press-bending red seat 2-1, tubing is repairing curved component 2-3, is repairing curved mould
Have under the common extruding of 2-2 and bend pipe mould 1-2, completes the bending of small-bend radius tubing.It should be strongly noted that at it
In embodiment, according to the requirement of bending radius, repairing curved component 2-3, repairing bending mould 2-2 and bend pipe for different model may be selected
Mold 1-2 is used cooperatively, and completes different-diameter tubing, the requirement of differently curved radius.
As shown in Figure 5 and Figure 6, in step 5 expand nozzle component 6 include expand nozzle red seat 6-1, expand nozzle shell 6-2, expand nozzle in punching
Head 6-3 and the second positioning column 6-4 expands on nozzle inner punch 6-3 wherein expanding nozzle shell 6-2 and being set in, specifically, expanding nozzle inner punch 6-
3 be cylinder step structure, and front end is equipped with annular protrusion.It is specific expand on nozzle shell 6-2 also offer expand nozzle inner punch hole and
Location hole expands nozzle inner punch for accommodating as shown in fig. 7, wherein expanding nozzle inner punch hole is step type hole.
More specifically, it is flared tubing short side is bent to demand size as shown in fig. 7, expanding nozzle component 6；For subsequent processing pipe
Nozzle punching press is prepared.
As shown in figure 9, the nozzle molding assembly 7 in step 5 includes molding red seat 7-1, molded housing 7-2, molding inner punch
7-3 and third positioning column 7-4, wherein molded housing 7-2 is set on molding inner punch 7-3, on specific molded housing 7-2
Forming punching head hole and location hole are offered, as shown in figure 8, wherein forming punching head hole is also step type hole, for accommodating in molding
Formed punch 7-3.
As shown in figure 8, molding inner punch 7-3 includes column core 7-5, guiding punching set 7-6 is equipped on the outside of column core 7-5, and lead
It is greater than column core 7-5 diameter to punching set 7-6 internal diameter, guiding punching set 7-6 internal diameter leading portion is equipped with chamfering, when for the molding of pipe nozzle, carries out
Pipeline short side punching press guiding, prevents short side from deforming, conducive to the punch forming of pipe nozzle.It as shown in Figure 10, is the tubing shape after punching press
Shape；Specific process for stamping can refer to step 3.
The present invention combines the scheme of punching press using heat treatment, realizes the processing of small crooked pipeline, after processing is completed, carries out
Pipe bent position cutting measures pipe bent position pipe thickness with point micrometer, and thinning 6% meets the thinning of code requirement
It is required within 20%, that is, thinning is smaller at pipe bending after processing, and thickness is met the requirements；And punch process has pipe nozzle, pipe nozzle
Convenient for installing when pipeline use, when enhancing pipeline strength, and quenching, preventing can be excessive with the heated amount of being deformed of pipeline.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of pipeline heat treatment process, which comprises the following steps:
Step 1: tubing raw material are completed blanking by cutting length interception by pipe feeding；
Step 2: blanking tubing is carried out in 450 DEG C of electric furnace high tempering processing, is rolled over again later by tubing prebuckling
Curved, shorter after bending is short side on one side；
Step 3: repairing curved punching press, and tubing is placed on punching press pedestal；Curved component is repaired in selection, is rushed to tubing short side knee
Pressure shortens the bending radius of tubing after punching press；
Step 4: normalized treatment, the tubing after brake forming keep the temperature 1 ~ 2 hour in 800 DEG C of electric furnace, carry out later empty
It is cold；
Tubing short side is flared to pre-set dimension by step 5, pipe nozzle punch forming with nozzle component punching press tubing short side is expanded；With platform
Rank formed punch continues punching press tubing short side, tubing short side annular protrusion；With the convex annular of nozzle molding assembly punching press tubing short side again
It rises, increases tube annular protrusion, complete punch forming；
Step 6: tubing is warming up to 900 DEG C of progress carburizing and quenching processing by carburizing and quenching, wherein Quenching Oil when quenching is cooling
Slot stirring is in close state；
Step 7: high tempering after punching press, tubing is placed in 500 DEG C of electric furnace and keeps the temperature 1 ~ 2 hour, carried out later air-cooled.
2. pipeline heat treatment process according to claim 1, which is characterized in that quenching oil employed in the step 6
For overspeed quenching oil, kinematic viscosity of the overspeed quenching oil at 40 DEG C is 13 ~ 21mm2/s。
3. pipeline heat treatment process according to claim 2, which is characterized in that the hypervelocity quenching used in the step 6
Quenching oil temperature of the oil in entire carburizing and quenching treatment process is 20 ~ 80 DEG C.
4. pipeline heat treatment process according to claim 1, which is characterized in that punching press pedestal described in step 3 includes branch
Support seat, bend pipe mould and locating slot, the bend pipe mould are fixed on support base, and the bend pipe mould upper end is provided with bent tube type
Slot；Described to repair curved component include repairing curved red seat, repairing bending mould, repair curved inner punch and the first positioning column, and described to repair curved inner punch solid
Due to repairing on curved red seat, the bending mould end face of repairing is provided with bore of the punch and semi-circular groove, described to repair curved inner punch across the punching
Head bore, the semi-circular groove axis direction are mutually passed through with bore of the punch axis vertical take-off, and mutually the place of passing through is circular arc；It is described that repair curved red seat also solid
Surely there are two first positioning columns, the bending mould of repairing also is opened there are two location hole, and first positioning column passes through the location hole.
5. pipeline heat treatment process according to claim 1, which is characterized in that expansion nozzle component described in step 5 includes expanding
Nozzle red seat, expand nozzle shell, expand nozzle inner punch and the second positioning column, the expansions nozzle shell is set on expansion nozzle inner punch, the expansion
Nozzle inner punch is cylinder step structure, and front end is equipped with annular protrusion.
6. pipeline heat treatment process according to claim 1, which is characterized in that nozzle molding assembly described in step 5 includes
Red seat, molded housing, molding inner punch and third positioning column are formed, the molded housing is set on molding inner punch, described
Forming inner punch includes column core, and guiding punching set is equipped on the outside of the column core, and the guiding punching set internal diameter is greater than column core diameter, and institute
It states guiding punching set internal diameter front end and is equipped with chamfering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910775423.3A CN110405023B (en) | 2019-08-21 | 2019-08-21 | Pipeline heat treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910775423.3A CN110405023B (en) | 2019-08-21 | 2019-08-21 | Pipeline heat treatment process |
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| Publication Number | Publication Date |
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| CN110405023A true CN110405023A (en) | 2019-11-05 |
| CN110405023B CN110405023B (en) | 2021-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910775423.3A Active CN110405023B (en) | 2019-08-21 | 2019-08-21 | Pipeline heat treatment process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113462875A (en) * | 2021-06-02 | 2021-10-01 | 李志鹏 | Stainless steel bar heat treatment equipment |
| CN114433680A (en) * | 2022-04-11 | 2022-05-06 | 华博管业有限公司 | Nondestructive forming process for stainless steel elbow pipe fitting |
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| CN1139026A (en) * | 1995-04-14 | 1997-01-01 | 日本电装株式会社 | Method for producing pipe, apparatus therefor and joint connecting member |
| JP2002130561A (en) * | 2000-10-26 | 2002-05-09 | Ootsuka:Kk | Flange joint and method of manufacturing the same |
| CN202638993U (en) * | 2012-07-12 | 2013-01-02 | 刘晓辉 | Elbow forming device |
| CN108714639A (en) * | 2018-05-11 | 2018-10-30 | 无锡智高点技术研发有限公司 | A kind of bent tube technique |
| CN109182717A (en) * | 2018-08-29 | 2019-01-11 | 荆州市江汉众力实业有限公司 | A kind of aero-engine bracket pipe fitting bends heat treatment process |
| CN109500130A (en) * | 2019-01-22 | 2019-03-22 | 德新钢管（中国）有限公司 | A kind of manufacturing method of the long-tube trailer seamless steel pipe for gas cylinder of 920 ㎜ of diameter |
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2019
- 2019-08-21 CN CN201910775423.3A patent/CN110405023B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139026A (en) * | 1995-04-14 | 1997-01-01 | 日本电装株式会社 | Method for producing pipe, apparatus therefor and joint connecting member |
| JP2002130561A (en) * | 2000-10-26 | 2002-05-09 | Ootsuka:Kk | Flange joint and method of manufacturing the same |
| CN202638993U (en) * | 2012-07-12 | 2013-01-02 | 刘晓辉 | Elbow forming device |
| CN108714639A (en) * | 2018-05-11 | 2018-10-30 | 无锡智高点技术研发有限公司 | A kind of bent tube technique |
| CN109182717A (en) * | 2018-08-29 | 2019-01-11 | 荆州市江汉众力实业有限公司 | A kind of aero-engine bracket pipe fitting bends heat treatment process |
| CN109500130A (en) * | 2019-01-22 | 2019-03-22 | 德新钢管（中国）有限公司 | A kind of manufacturing method of the long-tube trailer seamless steel pipe for gas cylinder of 920 ㎜ of diameter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113462875A (en) * | 2021-06-02 | 2021-10-01 | 李志鹏 | Stainless steel bar heat treatment equipment |
| CN114433680A (en) * | 2022-04-11 | 2022-05-06 | 华博管业有限公司 | Nondestructive forming process for stainless steel elbow pipe fitting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110405023B (en) | 2021-06-15 |
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