CN101797593A - Vertical axial extrusion process and device of high-temperature and high-pressure seamless tee joint - Google Patents
Vertical axial extrusion process and device of high-temperature and high-pressure seamless tee joint Download PDFInfo
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- CN101797593A CN101797593A CN200910007333A CN200910007333A CN101797593A CN 101797593 A CN101797593 A CN 101797593A CN 200910007333 A CN200910007333 A CN 200910007333A CN 200910007333 A CN200910007333 A CN 200910007333A CN 101797593 A CN101797593 A CN 101797593A
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Abstract
The invention discloses a technical scheme and a device for forming a seamless tee joint by using a tube through hot extrusion, which are used for producing high-temperature seamless tee joints and high-temperature and high-pressure seamless tee joints for pipelines of the power and petrochemical industries. The technical scheme is mainly characterized in that the specification and the process of raw materials can be integrally optimized and a reasonable flow of the materials in the forming process can be realized by combining three heating number processes of radial extrusion, axial vertical extrusion and supporting tube expanding and using a device (a device for realizing the axial line vertical extrusion and supporting tube expanding on a general vertical press machine) for realizing the process, so that the invention overcomes the defect that the shoulder part is thinned in the forming process by using the traditional radial extrusion method, saves raw materials by 20-30 percent as comparison with the traditional radial extrusion method, avoids the weld and the repair of the inner wall of the shoulder part, and improves the safety. The traditional pipe manufacturing factory realizes the vertical axial extrusion in mold on the general press machine by using the traditional press machine and die without setting a transverse hydraulic cylinder so as to reduce the investment and improve the production efficiency.
Description
Technical field
Threeway with the technical program manufacturing is with the tubing electric power that is used for by hot extrusion molding, the high pressure of petroleum and petrochemical industry and chemical industry and HTHP seam-less T-joint.
Background technology
Existing China most of pipe fitting manufactory HTHP threeway manufacture method is radial compensation method (tubing is through many fire time radially hot extrusions), its shortcoming is to make the shoulder inwall be subjected to action of pulling stress to make shoulder thickness that attenuate trend be arranged in pressing process, the moulding of shoulder inwall can not be satisfied design thickness, can only compensate by caliber and the thickness that increases mother tube in order to obtain enough arm height and shoulder thickness like this, and can't limit to be responsible for to thicken making the primary branch wall thickness excessive, allowance is big and two ends otch surplus is big.Even so most of threeway shoulder inwall also needs repair welding to thicken, this position Non-Destructive Testing is difficult to carry out the technology that can only depend on the welder, and potential safety hazard can't be eliminated.Cause following shortcoming like this: 1. stock utilization low (stock utilization 60%), owing to most ofly cause the high waste of cost big for expensive imported material.2. fire causes efficient low (the heavy wall threeway needs 7-8 fire) more.3. the shoulder moulding does not meet design requirement, poor stability (the repair welding metal thickness that has reaches more than the 100mm).The intrinsic defective (material flows unreasonable) of this technology itself makes and must overcome by simple improvement on this basis, and long-term facts have proved can not (can't further be optimized materials).
The axial compression method that also has the similar U.S. CE of the makers' manufacture method of fraction company in addition, CE company is a three-dimensional substep Loading Method.This method Forming Quality can meet design requirement (shoulder thickness is out of question), but they are provided with two horizontal squeeze cylinders (youngster's kiloton) in vertical UP machine both sides, the equipment complexity, and investment is big, and the cycle is long, the cost height.Especially domestic this sub-fraction manufactory lacks global optimization technology (material and technology), makes the stock utilization increase rate little.And want to carry out the transition to this kind axial compression method one for the manufactory of the most of radial compensation method of China is to lack due technology and experience, the 2nd, grope because material expensive will be paid great cost price by long-term test and practice, and prolonged application radial compensation method all makes all moulds and accessory at this method, and this reality causes for a long time that technical matters does not break through.
Summary of the invention
The technical program purpose is at the defective that prior art exists global optimization technology (material, technology, device) overcomes, adopt the implementation of simple possible and device to make the existing pipe fitting manufactory can be with low cost (utilizing the mould and the press of radial compensation method), transition (1 to 2 months) fast, bring benefits rapidly and (save material 28%～31% than the radial compensation method during by the computer simulation optimization, the special circumstances threeway is responsible for and an identical or close material saved 20%～24% of thickness of pipe wall in addition), the shoulder moulding can meet design requirement again, and it is inferior to raise the efficiency that whole forming process is reduced to 3 fire.To the producer that does not possess this condition also very smooth and easy (also can simultaneously mould be optimized design at the technical program).
The core of the technical program is: 1. adopt the mother tube specification optimized by material flowing law, reasonably the process sequence combination and for this reason the custom-designed implement device of process combination in forming process, control the material Rational flow, make moulding meet the three-way shape characteristics (thickening the position that should not thicken according to the threeway designing requirement position that this thickens in forming process reduces thick) and the strength character requirement of domestic and international standard, reduce allowance and improve stock utilization, stop the shoulder repair by welding and improve security.2. be implementation procedure apparatus structure reasonable in design according to existing pipe fitting factory technology and equipment condition, make its simple transition reduce cost of investment and raise the efficiency.
The elaborating of technical scheme (in conjunction with the accompanying drawings by expecting that from former the process for making of finished product sets forth in proper order):
One. raw material tubing dimensionally-optimised.Through 2000 multimachine computer-chronographs simulations find that its carbon steel and steel alloy mother tube specification (caliber, thickness, length) flow with the extrusion process material and finished product threeway size between relation and while match with pressing process and choose needed raw material tubing specification.Its primary election rule is: (symbol for dimensioning is seen Fig. 1, Fig. 2.What Fig. 1 marked is the specification of threeway, and wherein δ 1 is the design minimum wall thickness (MINI W.) with δ 2.What Fig. 2 marked is the specification of the selected raw material tubing of threeway (Fig. 1).)
1(δ1/δ2)≥1.35～1.45
S＝0.93δ2；L＝l*(δ1/S+0.05)；D＝H+0.42d1。
2(δ1/δ2)≥1.25～1.35
S＝0.93δ2；L＝l*(δ1/S+0.08)；D＝H+0.44d1。
3(δ1/δ2)≥1.15～1.25
S＝0.93δ2；L＝l*(δ1/S+0.11)；D＝H+0.46d1。
4(δ1/δ2)≥1.00～1.15
S＝0.93δ2；L＝l*(δ1/S+0.14)；D＝H+0.48d1。
The formula application process illustrates: the first step is calculated D earlier by top formula primary election specification, by the caliber (GB or ASME) of immediate standard or the caliber of forging pipe, calculates S again after D determines and rounds, and then calculate L with the S after rounding, and rounds then.Second step is according to the specification of primary election, accurately simulate the final raw material specification of determining by computer, can only more existing radial compensation extrusion save material 16%～28% as not simulating direct utilization by the material specification of formula primary election, if then can save material 28%～31% (the special circumstances threeway is responsible for and an identical or close material saved 20%～24% of thickness of pipe wall in addition) by Computer Simulation Optimization.Analogy method is that threeway mould tap is provided with (the high DH=H+2S/3 in the center at this end at the bottom of in second fiery time axial compression operation, be part 7 circular shim among Fig. 4, to axially further specify in the extrusion process at second fire), so that being squeezed, the circular arc top of axial compression final stage arm primary branch is thickened simultaneously and arm arc top extrusion chain-wales, this chain-wales the 3rd fire time develop arm the time extremely important arm and the shoulder of can further making thicken, the seamless cooperation of these three fire time operation can make arm meet the requirements of thickness separately and allowance is evenly reasonable with being responsible for.The center height (DH=H+2S/3 sees Fig. 4) bottom fine setting can make axial compression power not exceed the pressure limit of forcing press in the simulation process when the wall thickness of P91 steel mother tube is big.
Two. hot extrusion molding (needs a cover vertical die, can utilize the final pressure mould of radial compensation method, need not die change.)
1. first fire time (radial compression) comprising: heating-flattening-radial compression (bulge)-polishing burr.
Flatten one-time-reach-place, flatten height=d1-2 (external diameter is responsible in the d1=threeway), radially pressing one-time is finished.Radial compression can unstability when the ratio that flattens back straight section length and its wall thickness as can be known by computer simulation was not more than 5 (Fig. 3 is seen in LH/ δ≤5).So generally be no more than 3 because the 2nd fire is the axial compression first fire time radial compression LH/ δ.This also is different with existing radial compensation method, and existing radial compensation method is to flatten the many fire of 51mm to finish at every turn.
2. second fiery time (axial compression)
Second fire time comprises: removing surface (acid washing phosphorization)-outer surface is coated with paste glass lubricant-heating-workpiece and comes out of the stove into mould matched moulds-go into locked mode cover-upset (make threeway be responsible for the axle center and become vertical by level)-pretension-adjustments liftout tank (pushing the low punch contact workpiece)-compress axially (master cylinder work)-drill drift-be turned into level-go out cover-die sinking taking-up workpiece-next workpiece to come out of the stove.
The axial compression device is seen Fig. 4, Fig. 5, Fig. 6.Fig. 5 goes into the mould matched moulds after workpiece is come out of the stove, Fig. 6 is the state of axial compression device when entering the locked mode cover behind matched moulds, the state that Fig. 4 is the axial compression device when axial vertical extruding beginning.The press and the device on Fig. 5 dolly the right omit (not drawing among the figure) same Fig. 6.Fig. 4, Fig. 5, Fig. 6 are axially vertical three different duties of pressurizing unit, part and mark complete unity, and wherein the forcing press parts are all signal.Pressing the work step order below describes in detail.
(1). device is prepared: the come out of the stove preparation of front mold and device of workpiece, (use same set of mould with reference to Fig. 5 threeway upper and lower mould with the first fire time radial compression, the reconditioning that can extend earlier reaches requirement as curtailment) each fastens by convex-concave structure with three blocks of taper liner plates (seeing part 9 among Fig. 4, part 16, part 35, part 36), fix with dormant bolt then and (do not draw among the dormant bolt figure, rely on the self-locking of mill sassafras during axial compression between mould and the backing plate, not relative slip when only not playing out cover and going into to overlap) by bolting.Fasten (not drawing among the figure) by the convex-concave structure on the skew back backing plate equally between the upper and lower mould, not relative slip when using cover and going into to overlap.The locked mode cover is all general part with the taper liner plate in addition, and all the other are all general part except that the quick change drift.All specification threeway moulds are divided into two groups, greater than φ 457 is one group, is one group smaller or equal to φ 457, shared respectively two locked mode covers that vary in size, method be between taper liner plate and threeway mould with flat bolster adjustment (fastening) with concaveconvex structure, rely on friction self-locking during axial compression.Other one group of flat bolster also can general (having introduction in description of drawings and the embodiment).Original threeway mould matched moulds is packed into, and axial line is responsible in locked mode cover back and will there be higher perpendicularity locked mode cover baseplane.Locked mode cover baseplane is coated with common lubricant.
The adjustment of device before workpiece is come out of the stove: just in time be the needed stroke of axial compression with low punch height in the steel washer adjustment before workpiece is come out of the stove, and will go up low punch (Fig. 4 spare 15, part 26) and locked mode cover centering and fix.When calculating axial compression in advance movable platform (Fig. 4 spare 25) and on the weight of all parts, adjust press liftout tank pressure and sweep and be a bit larger tham this weight, purpose is to promote the weight that movable platform (Fig. 4 spare 31) balances the locked mode cover, mould, backing plate and the switching mechanism that are pressed on the movable platform with liftout tank by push rod to make the extruding force at two ends near equating.Dolly (parts 34) is put press dead ahead correct position again and fixed (axis is seen Fig. 6 with locked mode cover axis near overlapping), the threeway counterdie is placed on it, and this moment, Fig. 6 was seen in locked mode cover position.
(2). the preparation before the workpiece heating: workpiece acid washing phosphorization, purpose are that greasy dirt, dirt are cleaned out the raising lubricant effect with the floating rust on surface. outer surface is coated with paste glass lubricant (the heating-up temperature scope according to workpiece material has different glass lubricants).If corner angle appear in threeway person in charge two ends in addition or the two ends shape is asymmetric, make the two ends symmetry for avoiding side force and moment of torsion can go out facet to the two ends reconditioning too greatly.Put in the stove then and heat.
(3). workpiece was come out of the stove into mould matched moulds (60 seconds, relevant with the preparation before coming out of the stove), come out of the stove with reference to Fig. 5, Fig. 6 workpiece and to place that (the threeway counterdie is positioned on the dolly that fixes in advance in the threeway counterdie, and placed suitable circular shim according to DH=H+2S/3 threeway counterdie tap bottom, with reference to 7 circular shim of the part among Fig. 4), the threeway patrix is closed (available dedicated lifting device lifting patrix is to save time).
(4). go into locked mode cover (30 second), see that threeway and the mould after Fig. 6 will fasten drawn in the locked mode cover with overhead traveling crane (workpiece should be ready to before coming out of the stove) by fixed block.
(5). upset (30 second), turning device hydraulic cylinder works make threeway be responsible for the axle center to become vertical (see figure 4) by level, remove the interim cushion block below the movable platform.Adjusting liftout tank makes extruding low punch contact workpiece (just contact to well, should calculate the adjustment height of movable platform (Fig. 4 spare 25) in advance.
(6). pretension, when axial compression power reaches 6000 tons～6500 tons of the bloated type Li Keda of 5000 ton hours, at this moment because the strain 2.0mm～2.5mm (having considered Temperature Influence) of locked mode cover both direction, threeway mold charge internal diameter increases 2.0mm～2.5mm, can be used as threeway external diameter surplus and does not consider pretension.Threeway mold charge internal diameter increases 3mm when bloated type power reaches more than 7000 tons, at this moment can consider pretension.Pre-clamping method is to add interim cushion block (Fig. 4 spare 1) below movable platform, adds interim cushion block (Fig. 4 spare 42) forcing press and depress 20mm above the taper liner plate, and pretightning force can reach more than 6000 tons, removes interim cushion block then rapidly.Available mechanical mechanism realizes that interim cushion block is shifted rapidly and resets (this mechanism's this programme does not carry out specific design)
(7). axial compression (30 second～60 second), the moving crossbeam of press master cylinder work press is depressed.Between locked mode cover turning cylinder and the axle bed with big matched in clearance so that can do the slip (locked mode overlaps the baseplane and is coated with common lubricant) of small (2mm) between locked mode cover and the movable platform.Alleviate the side force that knock-pin is subjected to.
(8). drill drift, after axial compression finishes press is moved crossbeam rising 20mm～30mm, above the locked mode cover, add interim cushion block (Fig. 4 spare 41) press and depress 20mm (second step of low punch just in time withstood the threeway mould when axial compression stroke finished) again, with the enough height of the moving crossbeam rising of press, drill drift is finished again.
(9). upset, adjust upward movable platform with liftout tank earlier and exceed low punch, the upset hydraulic cylinder works makes the locked mode cover rotate 90 ° (with reference to figure 6) and with going into the identical method of locked mode cover mould is moved on the dolly, takes out the workpiece axial compression and finishes.
3. the 3rd fire time (developing arm)
The purpose that develops arm is to be full of mould below making the arm shoulder, simultaneously arm and shoulder is thickened.Method and process be with reference to figure 7, cuts a hole (φ C≤expect thick S) on the chain-wales (chain-wales that extrudes during axial compression) at tee branch fox top.Part among Fig. 71, part 2, part 3, part 4, part 5 are installed and adjusted.Device among shared Fig. 4 of device below the movable platform (movable platform Fig. 7 spare 5), method are that movable platform among Fig. 4 and top device are removed the movable platform of changing among Fig. 7 (Fig. 7 spare 5).
Workpiece (threeway) is come out of the stove into mould (with reference to figure 7), forcing press is depressed and Fig. 7 spare 4 (conical taper was greater than 1: 3) straight section has just been compressed into tee branch both can, Fig. 7 spare 4 straight section length FH=1.1*S (S is the wall thickness of mother tube), diameter is φ (W-10), φ W is the tee branch maximum inner diameter.The threeway patrix rises then, and liftout tank ejects the movable platform rising makes Fig. 7 spare 4 withdraw from arm.Take out workpiece.Adjust in addition more than the liftout tank pressure to 500 ton and prevent to be responsible for distortion to generate mold clamping force.
Three. the outer surface sandblast
This process comprises: whether sandblast (removing the glass lubricant of outer surface)-cut off arm redundance (being responsible for does not need scarfing), detecting each position has enough surpluses.
Four. heat treatment
Five. machined
This process comprises: line-machined (by circle and groove in the drawing turning primary branch)-polishing (it is slick and sly that outer surface and shoulder inwall become)-surperficial Non-Destructive Testing defectives such as () requirement surfaces externally and internally flawlesses.
Description of drawings
(1) Fig. 1 mark is the specification of threeway.
(2) Fig. 2 mark is the specification of the selected raw material tubing of threeway (Fig. 1).
(3) Fig. 3 is the radial compression state.
(4) Fig. 4 is the axially vertical pressurizing unit (axial compression initial state) of threeway, and wherein press parts (comprising part 10, part 11, part 12, part 14, part 30, part 31) are signal, and all the other parts all in proportion.Be Fig. 4 parts list below.
(5) Fig. 5 is that workpiece is packed into.
(6) Fig. 6 is the axially vertical pressurizing unit of threeway (a threeway workpiece pack into the state of back matched moulds when going into the locked mode cover).Fig. 4, Fig. 5, Fig. 6 are axially vertical three different duties of pressurizing unit, part and mark complete unity, and wherein the forcing press parts are all signal.Fig. 4 view C C remaining parts is omitted only draw locked mode cover, mould, backing plate, workpiece, locked mode sleeve and axle bed, and remaining parts is omitted.Fig. 4 view E to (1) and view E to (2) when being turning device in axial vertical extruding each the position relation and the threeway matched moulds after when going into the locked mode cover position of each concern.
(7) Fig. 7 is that arm develops device.Part 1 threeway patrix, part 2 is threeway workpiece, and part 3 is threeway counterdies, and part 4 is tapered drifts, and part 5 is movable platforms.With Fig. 4 be shared same set of device, just movable platform and above part are removed and are refilled another movable platform.
(8) the axially vertical pressurizing unit main parts size Analysis and design main points of Fig. 4 threeway: except the remaining parts of quick change drift (part 15) is all general part (comprise the locked mode cover, shared two the locked mode covers of all specification threeways are seen the explanation in the embodiment).
1. locked mode cover (part 6) size of giving in Fig. 4 is by φ 711 (minimum wall thickness (MINI W.) 128mm) P91 design of tee joint, the three-way valve mold lateral edges thickness B H=100 (BH sees Fig. 3 and Fig. 5) that it is packed into. Bear 6000 tons swollen type power (having considered temperature effect) strain 2mm when flexibility analysis compresses axially, swollen type power 8000 ton hour local yielding strain 3mm are so be maximum the carrying with 6000 tons swollen type masterpiece. Appearance and size can strengthen according to die size but wall thickness and bevel angle are constant. Alleviate the side force that knock-pin is subjected to big matched in clearance so that can do the slip of small (2mm) between locked mode cover and the movable platform between locked mode cover turning cylinder and the axle bed.
2. the quick change drift is that each threeway specification is made two (about the branch). The design main points be punch holder than quick change punch diameter I with general, links by cone pin after the quick change drift inserts. The quick change punch diameter is advisable than the little 2mm of three-way valve mold internal diameter, excessive friction mold damage when avoiding not overlapping with mold axis.
3. upset hydraulic cylinder (Fig. 4 spare 21) is bidirectional buffering hydraulic cylinder piston throw of lever 905mm, pressure 15Mpa, diameter of piston rod φ 70mm～φ 80mm, cylinder diameter φ 120mm～φ 160mm.
4. upset dwang (Fig. 4 spare 22) is selected the material of modulus 210Gpa.
The specific embodiment
Mode one: to possessing the pipe fitting factory of radial compression method threeway manufacturing capacity, original threeway mould can be rough milled processing to its profile, the need lengthening that has.All specification threeway moulds are divided into two groups (greater than φ 457 is first group, is second group smaller or equal to φ 457) and prepare two locked mode covers as general part with the method in the specification then.Prepare two groups of general taper liner plates then.Prepare two groups of general flat bolsters by the statistics all size.First group of general locked mode can satisfy the manufacturing of maximum specification threeway when overlapping highly for 2600mm.Prepare two movable platforms.Specification need satisfy the optimization criterion (four groups of formula) that provides in this programme when buying raw material.Content in the by specification just can the smooth implementation the technical program like this.
Mode two:, also can implement this programme to originally not possessing the producer that the HTHP threeway is created conditions.Can settle at one go during mould in preparation, need in addition more than 4500 tons, open height is greater than 5 meters press.Other is with mode one.
Claims (4)
1. the technical scheme of a cover HTHP seam-less T-joint extrusion modling is characterized in that the technology of order below carrying out:
(1) raw material is selected carbon steel and the steel alloy tubing of optimizing by following formula for use:
1) (δ 1/ δ 2) 〉=1.35～1.45 o'clock,
S＝0.93δ2，L＝l×(δ1/S+0.05)，D＝H+0.42d1；
2) (δ 1/ δ 2) 〉=1.25～1.35 o'clock,
S＝0.93δ2，L＝l×(δ1/S+0.08)，D＝H+0.44d1；
3) (δ 1/ δ 2) 〉=1.15～1.25 o'clock,
S＝0.93δ2，L＝l×(δ1/S+0.11)，D＝H+0.4δd1；
4) (δ 1/ δ 2) 〉=1.00～1.15 o'clock,
S=0.93 δ 2, L=l * (δ 1/S+0.14), D=H+0.48d1; More than in four groups of formula l be that length is responsible in threeway, δ 1, δ 2 are minimal design wall thickness of the threeway person in charge and arm, d1 is a threeway person in charge external diameter, H is a tee branch center height; S, L, D are respectively wall thickness, length, the external diameter of selected tubing; Calculate D earlier,, calculate S again after D determines and round, and then calculate L, round then with the S after rounding by the caliber (GB or ASME) of immediate standard or the caliber of forging pipe;
(2) heating---radial compression (bulge);
(3) phosphatization------heating---going into mould matched moulds locked mode---vertical axial extruding (thickening shoulder also thickens ratio and prop up a length of tube by distance (DH) the control primary branch of planchet plate with person in charge's axis) that it is lubricated crowded to be coated with paste glass;
(4) propping up tube end cuts hole (φ C)≤material thick (S)---heating---and develops arm (increase arm further thicken shoulder);
(5) blast cleaning glass is lubricated squeezes---the arm scarfing;
(6) heat treatment;
(7) pen machine processing internal diameter and groove---polishing.
2. require the method for regulation according to right 1, it is characterized in that on the general-purpose vertical press, realizing form by push rod that is fixed on band shoulder on the firm banking and straight section tapered punch, promotes by liftout tank and movable platform and by liftout tank generation mold clamping force with move back the device that is used for developing tee branch of mould power.
3. require the method for regulation according to right 1, it is characterized in that being used in pressurizing unit in the cover vertical axial mould of realizing on the vertical press, this covering device is touched cover, taper liner plate, switching mechanism, push rod, movable platform, is formed with the last low punch of two steps by lock.
4. require the device of regulation according to right 3, it is characterized in that having used the pressure that comes equilibrium single cylinder vertically to push two ends through push rod promotion movable platform to the mould applied pressure by the adjustment liftout tank to realize the method for vertical extruding in the two-way equipotential shifting formwork.
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| CN200910007333A CN101797593A (en) | 2009-02-11 | 2009-02-11 | Vertical axial extrusion process and device of high-temperature and high-pressure seamless tee joint |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699657A (en) * | 2012-06-19 | 2012-10-03 | 浙江嘉兴亚达不锈钢制造有限公司 | Multi-way pipe connecting method |
| CN103394881A (en) * | 2013-08-15 | 2013-11-20 | 北京隆盛泰科石油管科技有限公司 | Novel hot extrusion tee joint forming process |
| CN105057558A (en) * | 2015-07-07 | 2015-11-18 | 河南锦源精密机械制造有限公司 | Big-end multi-step hollow shaft forging piece moulding method and vertical-horizontal dual-purpose swing rolling machine |
| CN105689432A (en) * | 2014-11-26 | 2016-06-22 | 河北汇中管道装备有限公司 | Bimetal composite tee cold extrusion technology |
| CN115591965A (en) * | 2022-12-08 | 2023-01-13 | 江苏新恒基特种装备股份有限公司（Cn） | Cold extrusion method and system for increasing branch pipe drawing height and storage medium |
-
2009
- 2009-02-11 CN CN200910007333A patent/CN101797593A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102699657A (en) * | 2012-06-19 | 2012-10-03 | 浙江嘉兴亚达不锈钢制造有限公司 | Multi-way pipe connecting method |
| CN103394881A (en) * | 2013-08-15 | 2013-11-20 | 北京隆盛泰科石油管科技有限公司 | Novel hot extrusion tee joint forming process |
| CN103394881B (en) * | 2013-08-15 | 2016-12-28 | 北京隆盛泰科石油管科技有限公司 | A kind of hot extrusion three-way forming technique |
| CN105689432A (en) * | 2014-11-26 | 2016-06-22 | 河北汇中管道装备有限公司 | Bimetal composite tee cold extrusion technology |
| CN105057558A (en) * | 2015-07-07 | 2015-11-18 | 河南锦源精密机械制造有限公司 | Big-end multi-step hollow shaft forging piece moulding method and vertical-horizontal dual-purpose swing rolling machine |
| CN115591965A (en) * | 2022-12-08 | 2023-01-13 | 江苏新恒基特种装备股份有限公司（Cn） | Cold extrusion method and system for increasing branch pipe drawing height and storage medium |
| CN115591965B (en) * | 2022-12-08 | 2023-03-10 | 江苏新恒基特种装备股份有限公司 | Cold extrusion method and system for increasing branch pipe drawing height and storage medium |
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Application publication date: 20100811 |