CN101704055A - Hot pressing forming mould and hot pressing forming method of super long branch pipe three-way pipe fitting - Google Patents
Hot pressing forming mould and hot pressing forming method of super long branch pipe three-way pipe fitting Download PDFInfo
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- CN101704055A CN101704055A CN200910253921A CN200910253921A CN101704055A CN 101704055 A CN101704055 A CN 101704055A CN 200910253921 A CN200910253921 A CN 200910253921A CN 200910253921 A CN200910253921 A CN 200910253921A CN 101704055 A CN101704055 A CN 101704055A
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Abstract
The invention relates to a hot pressing forming mould of a super long branch pipe three-way pipe fitting, comprising a first upper die, a second upper die, a first lower die, a second lower die, a third lower die, a fourth lower die and a draw bar. A primary forming mould consists of the first upper die and the first lower die; a secondary forming mould consists of the first upper die and the second lower die; a third forming mould consists of the first upper die and the third lower die; and a final forming mould consists of the second upper die, the fourth lower die and the draw bar. The invention also relates to a hot pressing forming method which adopts the mould to manufacture the super long branch pipe three-way pipe fitting. Two upper dies and four lower dies are adopted by the invention to be drawn and extruded step by step into a super long branch pipe; in each hot pressing forming process, the tensile deformation of the materials is ensured to be within the tensile rate limit by controlling the root R and the outer diameter D of the branch pipe to be decreased successively, thereby solving the forming problem of super long branch pipe tee (M>1.5C).
Description
Technical field
The present invention relates to pipe fitting process equipment field, especially the mould of hot forming tee pipe fitting and manufacturing process.
Background technology
The extensive use tee pipe fitting carries out the pipeline connection in the pipeline.Hot press forming method commonly used is made the seam-less T-joint pipe fitting of major diameter and thick tube wall in the production, hot press forming method forms in mould after being meant a heating of pipe blank, because adopt the pipe after the heating to suppress, material forming devices needed tonnage demand can reduce.As shown in Figure 1, the length M of seam-less T-joint arm 1 equals to be responsible for 2 length C in the CNS, hot forming for the seam-less T-joint of this GB, concrete technology such as Fig. 2, shown in Figure 3: earlier will be greater than the pipe 4 of threeway diameter, flatten approximately to the size of threeway diameter, open a hole 6 at the position of stretching arm; With pipe 4 heating, put between the patrix 3 and counterdie 7 of hot forming mould, and the pull bar 5 of the stretching arm of in the hole 6 of pipe 4, packing into; Forcing press drives the patrix 3 descending matched moulds that carry out as shown in Figure 3, and by radial compression, according to the constancy of volume principle, the pipe metal flows to the arm direction pipe 4 in the process of radial compression under the effect of pressure, forms arm 1 simultaneously under the stretching of pull bar 5.The forming process of arm is that the stretching by pipe radial compression and arm position is shaped, and arm is that the radial motion by blank tube material compensates, so be also referred to as radial compensation technology.
Along with the development of pipe technology, need a kind of arm length M greater than being responsible for the seam-less T-joint of length C more than 50%, hereinafter referred to as the threeway of overlength arm.If produce according to above-mentioned once-forming technology for the threeway of this overlength arm, long because of arm one-off drawing deflection, material deformation has surmounted the extensibility limit, causes forming quality defective, can't direct forming.
Summary of the invention
The applicant can not make the shortcoming of super long branch pipe three-way pipe fitting at above-mentioned existing production technology and mould, a kind of hot forming mould and hot press forming method of super long branch pipe three-way pipe fitting are provided, thereby on existing equipment, can make super long branch pipe three-way pipe fitting.
The technical solution adopted in the present invention is as follows:
A kind of hot forming mould of super long branch pipe three-way pipe fitting comprises upper die and lower die and pull bar, specifically comprises first patrix, second patrix, first counterdie, second counterdie, the 3rd counterdie, the 4th counterdie, pull bar; The original formation mould is made up of first patrix and first counterdie: the straight length die cavity diameter of first patrix is D1; The straight length die cavity diameter of first counterdie is D1, and a pipeline section die cavity diameter is D1, and straight tube and arm transition position radius of corner are R1; The secondary forming mould is made up of first patrix and second counterdie: the straight length die cavity diameter of second counterdie is D1, and a pipeline section die cavity diameter is D1, and straight tube and arm transition position radius of corner are R2; No. three times shaping dies is made up of first patrix and the 3rd counterdie: the straight length die cavity diameter of the 3rd counterdie is D1, and a pipeline section die cavity diameter is D2, and straight tube and arm transition position radius of corner are R2; Final shaping dies is made up of second patrix, the 4th counterdie and pull bar: the straight length die cavity diameter of second patrix is D3; The straight length die cavity diameter of the 4th counterdie is D3, and a pipeline section die cavity diameter is D3, and straight tube and arm transition position radius of corner are R3.Each size relationship is: R3=R, R2=R3/ α, R1=R2/ β; D3=S * D, D2=D3+ (5～10) mm, D1=D2/ γ; Wherein D is the threeway diameter, and R is three-way straight pipe and arm transition position radius of corner, and S is a material known hot forming shrinkage factor, and the α value is 65%～75%, is preferably 70%; The β value is 65%～75%, is preferably 70%; The γ value is 81%～91%, is preferably 86%.
Adopt the hot press forming method of the super long branch pipe three-way pipe fitting of above-mentioned hot forming mould, may further comprise the steps:
The first step, base: carry out the blanking of straight tube pipe according to product specification, straight tube pipe diameter D0 is greater than 50%～60% of threeway diameter D.
In second step, flatten for the first time: the pipe diameter is flattened die cavity diameter dimension D1 to first counterdie with hydraulic press, can be less than D1 3～5mm, pipe in the middle of first is shaped.
The 3rd step, heating for the first time: utilize Frequency Induction Heating, a control side pipe base to the arm that will be shaped carries out local heat, makes arm side material be easy to flow toward mould arm place and form arm.
The 4th step, hot forming for the first time: pipe is put between the original formation mould of being made up of first patrix and first counterdie and is suppressed in the middle of first, suppresses a segment distance H1, and the second middle pipe is shaped.
The 5th step, heating for the second time: utilize Frequency Induction Heating, control is only carried out local heat to a side pipe base of the arm that will be shaped.
The 6th step, hot forming for the second time: pipe is put between the secondary forming mould of being made up of first patrix and second counterdie and is suppressed in the middle of second, suppresses a segment distance H2, and the 3rd middle pipe is shaped.
The 7th step, heating for the third time; Utilize Frequency Induction Heating, control is only carried out local heat to a side pipe base of the arm that will be shaped.
The 8th step, hot forming for the third time: pipe is put between No. three shaping dies of being made up of first patrix and the 3rd counterdie and is suppressed in the middle of the 3rd, suppresses a segment distance H3, and the 4th middle pipe is shaped.
In the 9th step, flatten: pipe in the middle of the 4th behind the hot forming is for the third time flattened die cavity diameter D3 size to the 4th counterdie with hydraulic press, can be less than D3 3～5mm, the 5th middle pipe is shaped.
The tenth step, the 4th heating: whole heating in electric furnace.
In the 11 step, the 4th hot forming: the 5th middle pipe is put between the final shaping dies of being made up of second patrix, the 4th counterdie, and second patrix presses down compacting one segment distance H4, and the 6th middle pipe is shaped.
The 12 step, pipe tube end cutting perforate in the middle of the 6th: remove arm hat head with the cutting cutting.
In the 13 step, final arm stretches: with Frequency Induction Heating to pipe arm one side local heat in the middle of six after, pipe is put into the 4th counterdie, again pack into the perforate of pipe of counterdie pull bar, with second Ccope closing machine, by the stretching of counterdie pull bar to the arm position, the threeway product is shaped.
The present invention adopts two patrixes and four counterdies, and progressively stretching has squeezed out the overlength arm; In each hot forming, successively decrease successively by the size of control arm root R and arm outer diameter D, guarantee that material tensile deformation within the extensibility limit, has solved the shaping problem of the overlength arm threeway of M＞1.5C.
Description of drawings
Fig. 1 is the product cross section figure of seam-less T-joint pipe fitting;
Fig. 2 is the hot forming schematic diagram of existing seam-less T-joint, and this is state before being shaped;
Fig. 3 is the hot forming schematic diagram of existing seam-less T-joint, and this is the back state that is shaped;
Fig. 4 is the front view of original formation mould of the present invention, state before the work;
The same Fig. 4 of Fig. 5 is the back state of working;
Fig. 6 is the left view of Fig. 5;
Fig. 7 is the front view of secondary forming mould of the present invention, state before the work;
The same Fig. 7 of Fig. 8 is the back state of working;
Fig. 9 is the left view of Fig. 8;
Figure 10 is the front view of No. three shaping dies of the present invention, state before the work;
The same Figure 10 of Figure 11 is the back state of working;
Figure 12 is the left view of Figure 11;
Figure 13 is the front view of final shaping dies of the present invention, state before the work;
The same Figure 13 of Figure 14 is the back state of working;
Figure 15 is the left view of Figure 14;
Figure 16 is the front view of final shaping dies of the present invention, work back state.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described.
To shown in Figure 16, the hot forming mould of super long branch pipe three-way pipe fitting of the present invention comprises first patrix 11, second patrix 19, first counterdie 13, second counterdie 15, the 3rd counterdie 17, the 4th counterdie 20, pull bar 22 as Fig. 4.As Fig. 4, Fig. 5, shown in Figure 6, the original formation mould is made up of first patrix 11 and first counterdie 13: the straight length die cavity diameter of first patrix 11 is D1; The straight length die cavity diameter of first counterdie 13 is D1, and a pipeline section die cavity diameter is D1, and straight tube and arm transition position radius of corner are R1.As Fig. 7, Fig. 8, shown in Figure 9, the secondary forming mould is made up of first patrix 11 and second counterdie 15: the straight length die cavity diameter of second counterdie 15 is D1, and a pipeline section die cavity diameter is D1, and straight tube and arm transition position radius of corner are R2.As Figure 10, Figure 11, shown in Figure 12, No. three times shaping dies is made up of first patrix 11 and the 3rd counterdie 17: the straight length die cavity diameter of the 3rd counterdie 17 is D1, and a pipeline section die cavity diameter is D2, and straight tube and arm transition position radius of corner are R2.As Figure 13, Figure 14, Figure 15, shown in Figure 16, final shaping dies is made up of with pull bar 22 second patrix 19, the 4th counterdie 20: the straight length die cavity diameter of second patrix 19 is D3; The straight length die cavity diameter of the 4th counterdie 20 is D3, and a pipeline section die cavity diameter is D3, and straight tube and arm transition position radius of corner are R3; Pull bar 22 head diameters are identical with a bore, and the structure of pull bar 22 is identical with the pull bar of assembly method and prior art.For producing the threeway of the overlength arm of M＞1.5C as shown in Figure 1, the product diameter is D, and straight tube and arm knuckle are R, and then the relation of each size is as follows: R3=R, R2=R3/ α, R1=R2/ β; D3=S * D, D2=D3+ (5～10) mm, D1=D2/ γ; Wherein the α value is 65%～75%, is preferably 70%; The β value is 65%～75%, is preferably 70%; The γ value is 81%～91%, is preferably 86%; S is a material known hot forming shrinkage factor.
Adopt hot forming die forming super long branch pipe three-way pipe fitting of the present invention, need to adopt following processing step:
The first step, base: carry out the blanking of straight tube pipe according to product specification, straight tube pipe diameter D0 is greater than 50%～60% of threeway diameter D.
In second step, flatten for the first time: the pipe diameter is flattened die cavity diameter dimension D1 to first counterdie 13 with hydraulic press, can be less than D1 3～5mm, pipe 12 in the middle of first is shaped.
The 3rd step, heating for the first time: utilize Frequency Induction Heating, a control side pipe base to the arm that will be shaped carries out local heat, makes arm side material be easy to flow toward mould arm place and form arm.
The 4th step, hot forming for the first time: as Fig. 4, Fig. 5, shown in Figure 6, the first middle pipe 12 is put between the original formation mould of being made up of first patrix 11 and first counterdie 13 and is suppressed, and suppresses a segment distance H1, and the second middle pipe 14 is shaped.At this moment: 1. fits fully with patrix in the material of pipe patrix side distortion back, the 2. pipe arm root part of R1 that is shaped, 3. the arm diameter size of D1 that is shaped.
The 5th step, heating for the second time: utilize Frequency Induction Heating, control is only carried out local heat to a side pipe base of the arm that will be shaped.
The 6th step, hot forming for the second time: as Fig. 7, Fig. 8, shown in Figure 9, the second middle pipe 14 is put between the secondary forming mould of being made up of first patrix 11 and second counterdie 15 and is suppressed, and suppresses a segment distance H2, and the 3rd middle pipe 16 is shaped.At this moment: 1. fits fully with patrix in the material of pipe patrix side distortion back, 2. the pipe arm root R2 part that is shaped.
The 7th step, heating for the third time; Utilize Frequency Induction Heating, control is only carried out local heat to a side pipe base of the arm that will be shaped.
The 8th step, hot forming for the third time: as Figure 10, Figure 11, shown in Figure 12, the 3rd middle pipe 16 is put between No. three shaping dies of being made up of first patrix 11 and the 3rd counterdie 17 and is suppressed, and suppresses a segment distance H3, and the 4th middle pipe 18 is shaped.At this moment: the 1. pipe arm root R2 part that is shaped, 2. the arm diameter D2 size that is shaped.
In the 9th step, flatten: pipe 18 usefulness hydraulic presses in the middle of the 4th behind the hot forming are for the third time flattened die cavity diameter D3 size to the 4th counterdie 20, can be less than D3 3～5mm, the 5th middle pipe 18 ' is shaped.
The tenth step, the 4th heating: whole heating in electric furnace.
The 11 step, the 4th hot forming: as Figure 13, Figure 14, shown in Figure 15, pipe 18 ' is put between the final shaping dies of being made up of second patrix 19, the 4th counterdie 20 in the middle of the 5th, and second patrix 19 presses down compacting one segment distance H4, and the 6th middle pipe 21 is shaped.At this moment: 1. fit the 2. pipe arm root R3 part that is shaped, 3. the arm diameter D3 size that is shaped behind the material deformation of pipe patrix side fully with patrix.
The 12 step, pipe 21 tube ends cutting perforate in the middle of the 6th: remove arm hat head with the cutting cutting.
The 13 step, final arm stretches: as shown in figure 16, with Frequency Induction Heating to pipe 21 arms one side local heat in the middle of the 6th after, pipe is put into the 4th counterdie 20, again pack into the perforate of pipe 21 of counterdie pull bar 22, with second patrix, 19 matched moulds, by the stretching at 22 pairs of arm positions of counterdie pull bar, a length of tube is met the demands, and threeway product 23 is shaped; Patrix is not suppressed in this step process, and the extensional motion of pull bar 22 is only arranged.
After the product depanning, the dimensional contraction process that also has stress release and the hot pyrocondensation of rising to cause.Shrinkage factor has designed in the size of final mould.After the material contraction was stable, the diameter of three-way straight pipe Duan Yuzhi pipeline section was D, just the desired size of drawing.
More than describing is explanation of the invention, not that institute of the present invention restricted portion is referring to claim, under the situation of spirit of the present invention to the qualification of invention, the present invention can do any type of modification, for example regulates shaping number of times and die size according to concrete material.
Claims (2)
1. the hot forming mould of a super long branch pipe three-way pipe fitting comprises upper die and lower die and pull bar, it is characterized in that: specifically comprise first patrix, second patrix, first counterdie, second counterdie, the 3rd counterdie, the 4th counterdie, pull bar; The original formation mould is made up of first patrix and first counterdie: the straight length die cavity diameter of first patrix is D1; The straight length die cavity diameter of first counterdie is D1, and a pipeline section die cavity diameter is D1, and straight tube and arm transition position radius of corner are R1; The secondary forming mould is made up of first patrix and second counterdie: the straight length die cavity diameter of second counterdie is D1, and a pipeline section die cavity diameter is D1, and straight tube and arm transition position radius of corner are R2; No. three times shaping dies is made up of first patrix and the 3rd counterdie: the straight length die cavity diameter of the 3rd counterdie is D1, and a pipeline section die cavity diameter is D2, and straight tube and arm transition position radius of corner are R2; Final shaping dies is made up of second patrix, the 4th counterdie and pull bar: the straight length die cavity diameter of second patrix is D3; The straight length die cavity diameter of the 4th counterdie is D3, and a pipeline section die cavity diameter is D3, and straight tube and arm transition position radius of corner are R3.Each size relationship is: R3=R, R2=R3/ α, R1=R2/ β; D3=S * D, D2=D3+ (5～10) mm, D1=D2/ γ; Wherein D is the threeway diameter, and R is three-way straight pipe and arm transition position radius of corner, and S is a material known hot forming shrinkage factor; The α value is 65%～75%, is preferably 70%; The β value is 65%～75%, is preferably 70%; The γ value is 81%～91%, is preferably 86%.
2. adopt the hot press forming method of the super long branch pipe three-way pipe fitting of the described hot forming mould of claim 1, it is characterized in that, may further comprise the steps:
The first step, base: carry out the blanking of straight tube pipe according to product specification, straight tube pipe diameter D0 is greater than 50%～60% of threeway diameter D.
In second step, flatten for the first time: the pipe diameter is flattened die cavity diameter dimension D1 to first counterdie with hydraulic press, can be less than D1 3～5mm, pipe in the middle of first is shaped.
The 3rd step, heating for the first time: utilize Frequency Induction Heating, a control side pipe base to the arm that will be shaped carries out local heat, makes arm side material be easy to flow toward mould arm place and form arm.
The 4th step, hot forming for the first time: pipe is put between the original formation mould of being made up of first patrix and first counterdie and is suppressed in the middle of first, suppresses a segment distance H1, and the second middle pipe is shaped.
The 5th step, heating for the second time: utilize Frequency Induction Heating, control is only carried out local heat to a side pipe base of the arm that will be shaped.
The 6th step, hot forming for the second time: pipe is put between the secondary forming mould of being made up of first patrix and second counterdie and is suppressed in the middle of second, suppresses a segment distance H2, and the 3rd middle pipe is shaped.
The 7th step, heating for the third time; Utilize Frequency Induction Heating, control is only carried out local heat to a side pipe base of the arm that will be shaped.
The 8th step, hot forming for the third time: pipe is put between No. three shaping dies of being made up of first patrix and the 3rd counterdie and is suppressed in the middle of the 3rd, suppresses a segment distance H3, and the 4th middle pipe is shaped.
In the 9th step, flatten: pipe in the middle of the 4th behind the hot forming is for the third time flattened die cavity diameter D3 size to the 4th counterdie with hydraulic press, can be less than D3 3～5mm, the 5th middle pipe is shaped.
The tenth step, the 4th heating: whole heating in electric furnace.
In the 11 step, the 4th hot forming: the 5th middle pipe is put between the final shaping dies of being made up of second patrix, the 4th counterdie, and second patrix presses down compacting one segment distance H4, and the 6th middle pipe is shaped.
The 12 step, pipe tube end cutting perforate in the middle of the 6th: remove arm hat head with the cutting cutting.
In the 13 step, final arm stretches: with Frequency Induction Heating to pipe arm one side local heat in the middle of six after, pipe is put into the 4th counterdie, again pack into the perforate of pipe of counterdie pull bar, with second Ccope closing machine, by the stretching of counterdie pull bar to the arm position, the threeway product is shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009102539218A CN101704055B (en) | 2009-12-01 | 2009-12-01 | Hot pressing forming mould and hot pressing forming method of super long branch pipe three-way pipe fitting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102539218A CN101704055B (en) | 2009-12-01 | 2009-12-01 | Hot pressing forming mould and hot pressing forming method of super long branch pipe three-way pipe fitting |
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| CN101704055A true CN101704055A (en) | 2010-05-12 |
| CN101704055B CN101704055B (en) | 2011-06-15 |
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| CN102029312A (en) * | 2010-11-23 | 2011-04-27 | 江阴中南重工股份有限公司 | Metal concentrated pipe downwards-drawing device |
| CN102049441A (en) * | 2010-11-23 | 2011-05-11 | 江阴中南重工股份有限公司 | Production device for downwardly drawing of metal manifold |
| CN102284671A (en) * | 2010-06-21 | 2011-12-21 | 中国石油天然气集团公司 | Manufacturing process method for high-steel-grade large-aperture thick-wall tee joint |
| CN102320149A (en) * | 2011-05-31 | 2012-01-18 | 四川泰鑫实业发展有限责任公司 | Shaping technology and shaping device for large-diameter PE (poly ethylene) reduced tee joint branch pipe |
| CN102773675A (en) * | 2012-08-14 | 2012-11-14 | 河南光大管业有限公司 | Molding process of header body |
| CN103028647A (en) * | 2012-12-25 | 2013-04-10 | 黄山鼎奇链传动有限公司 | Machining method for high-strength transverse 8-shaped part |
| CN104942135A (en) * | 2015-06-19 | 2015-09-30 | 沧州隆泰迪管道科技有限公司 | Y-shaped seamless tee pressing technology |
| CN106944495A (en) * | 2017-03-03 | 2017-07-14 | 江苏兴洋管业股份有限公司 | A kind of oversize two phase stainless steel threeway integral forming method |
| CN107052080A (en) * | 2017-03-09 | 2017-08-18 | 江苏兴洋管业股份有限公司 | A kind of hot-pressed three-way pipe fitting pipe partition heating temperature controlling instruments and its heated for controlling temperature method |
| CN109016425A (en) * | 2018-06-28 | 2018-12-18 | 云南联塑科技发展有限公司 | A kind of PE plumbing dimensions production control method |
| CN115475850A (en) * | 2022-08-31 | 2022-12-16 | 河北沧海核装备科技股份有限公司 | Forming process and equipment of three-way pipe for pipeline engineering |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102284671A (en) * | 2010-06-21 | 2011-12-21 | 中国石油天然气集团公司 | Manufacturing process method for high-steel-grade large-aperture thick-wall tee joint |
| CN102029312A (en) * | 2010-11-23 | 2011-04-27 | 江阴中南重工股份有限公司 | Metal concentrated pipe downwards-drawing device |
| CN102049441A (en) * | 2010-11-23 | 2011-05-11 | 江阴中南重工股份有限公司 | Production device for downwardly drawing of metal manifold |
| CN102320149B (en) * | 2011-05-31 | 2014-07-09 | 四川泰鑫实业发展有限责任公司 | Shaping technology and shaping device for large-diameter PE (poly ethylene) reduced tee joint branch pipe |
| CN102320149A (en) * | 2011-05-31 | 2012-01-18 | 四川泰鑫实业发展有限责任公司 | Shaping technology and shaping device for large-diameter PE (poly ethylene) reduced tee joint branch pipe |
| CN102773675A (en) * | 2012-08-14 | 2012-11-14 | 河南光大管业有限公司 | Molding process of header body |
| CN102773675B (en) * | 2012-08-14 | 2014-09-10 | 河南光大管业有限公司 | Molding process of header body |
| CN103028647A (en) * | 2012-12-25 | 2013-04-10 | 黄山鼎奇链传动有限公司 | Machining method for high-strength transverse 8-shaped part |
| CN103028647B (en) * | 2012-12-25 | 2015-04-08 | 黄山鼎奇链传动有限公司 | Machining method for high-strength transverse 8-shaped part |
| CN104942135A (en) * | 2015-06-19 | 2015-09-30 | 沧州隆泰迪管道科技有限公司 | Y-shaped seamless tee pressing technology |
| CN106944495A (en) * | 2017-03-03 | 2017-07-14 | 江苏兴洋管业股份有限公司 | A kind of oversize two phase stainless steel threeway integral forming method |
| CN106944495B (en) * | 2017-03-03 | 2018-10-02 | 江苏兴洋管业股份有限公司 | A kind of oversize two phase stainless steel threeway integral forming method |
| CN107052080A (en) * | 2017-03-09 | 2017-08-18 | 江苏兴洋管业股份有限公司 | A kind of hot-pressed three-way pipe fitting pipe partition heating temperature controlling instruments and its heated for controlling temperature method |
| CN109016425A (en) * | 2018-06-28 | 2018-12-18 | 云南联塑科技发展有限公司 | A kind of PE plumbing dimensions production control method |
| CN115475850A (en) * | 2022-08-31 | 2022-12-16 | 河北沧海核装备科技股份有限公司 | Forming process and equipment of three-way pipe for pipeline engineering |
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| CN101704055B (en) | 2011-06-15 |
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Address after: Hu Dai Industrial Park, No. 136 vibration Binhu District 214161 Jiangsu province Wuxi City Hu Road extension area Patentee after: Wuxi City Xinfeng Pipe Co., Ltd. Address before: 214064 Jiangsu province Binhu District of Wuxi City Qian Rong Lu No. 54 Patentee before: Wuxi Xinfeng Pipe-Fitting Co., Ltd. |