CN101954389A - Metal elbow cold extrusion molding device - Google Patents
Metal elbow cold extrusion molding device Download PDFInfo
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- CN101954389A CN101954389A CN 201010282349 CN201010282349A CN101954389A CN 101954389 A CN101954389 A CN 101954389A CN 201010282349 CN201010282349 CN 201010282349 CN 201010282349 A CN201010282349 A CN 201010282349A CN 101954389 A CN101954389 A CN 101954389A
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Abstract
The invention relates to a metal elbow cold extrusion molding device for processing metal pipe fittings. The invention solves the defects of serious loss of filters, long process time and high bending cost of pipe fittings in the traditional pipe bending technology which needs filling. The metal elbow cold extrusion molding device comprises an extrusion mold core which can be inserted into a mold cavity and a core pushing stick for pushing the pipe fittings to be processed. The extrusion mold core comprises a basic shaft and a working end. The basic shaft is adapted to the inner diameter of the mold cavity, at least one gap equal with the wall thickness of the pipe fitting is arranged between the working end and the inner wall of the mold cavity, the projection of the working end along with the axial direction of the basic shaft is of a round shape, and the round shape is consistent with the inner diameter of the pipe fitting to be processed. The axial projection of the working end is of the round shape, then the pipe fitting can be repaired when the working end exits, the end part of the pipe fitting is of the round shape, the pipe fitting is formed by extruded and bended one-step molding and does not need cooling, the bending time is short, the operation is simple, the efficiency is high, the shape of the end part of the final pipe fitting is more in line with requirements, and the precision is higher.
Description
Technical field
The present invention relates to a kind of metal pressurizing unit, especially a kind of metal bends cold extruding and forming device that is used for the processing metal pipe fitting.
Background technology
Traditional bent tube technique uses bending machine, and by the guiding of bending machine, pipe fitting is bent, still, this technology, in the pipe fitting bending, the position easy deformation of pipe fitting bending, may become flat-shaped, cumbersome in the pipe fitting butt joint like this, and also the docking site is also than being easier to cause leakage.Therefore in the existing pipe fitting bending method, use a kind of technology of filling, in pipe fitting, fill, such as irritating plumbous, irritating wax or steel ball etc., what irritate plumbous employing is at inner adding of pipe fitting and the suitable lead of pipe fitting internal diameter volume, needs process blanking, molten lead, irritates lead, moulding, deleading, scarfing 6 procedures, and the pipe fitting surface also needs to remove the residual lead of pipe fitting inner wall through the mode of overpickling, be engaged in plumbous work for a long time, all can cause bigger harm the environment of plant and workman; Irritate wax with irritate plumbous the same also will be through 6 procedures, the forming method of irritating plumbous and irritating wax needs that the chien shih pipe fitting cools off when a large amount of, will cause the production cycle prolongation of pipe fitting bending like this; The method of steel ball need be added steel ball repeatedly in forming process, needing more after moulding, exchange device carries out the steel ball shaping again, cause whole activity time long, the equipment that needs is also more, and it is also bigger to the wearing and tearing of core rod, pipe fitting is also wrinkling easily, and these fillers in use can reduce or loss, and the cost of pipe fitting bending is higher.
Patent Office of the People's Republic of China has announced a CN201436097U patent on April 7th, 2010, name is called the mandrel that is used for the metal tube bending tube forming, the front end of mandrel is coniform, its cone tip part is provided with respect to the central axis of mandrel is eccentric, and deflection bend pipe inboard, the cone tip part rounding off, on the cross section of the front end of mandrel, little towards the cross section of bend pipe inboard camber ratio towards the cross section radian in the bend pipe outside, be provided with grease channel in the mandrel, one end perforate of nozzle opening is in the front end of grease channel, its other end perforate is in the front end outer radius of mandrel, and an end perforate of fuel feed hole is in the rear end of grease channel, and its other end perforate is in the rear end of mandrel outer radius, the rear end of mandrel is provided with the internal thread hole identical with grease channel, and an end perforate of fuel feed hole is in internal thread hole.When but pipe fitting is used the bending machine bending, the end of pipe fitting can be identical with the leading section of mandrel gradually, the cross sectional shape of pipe fitting can deform, the crooked position of final bend pipe just is not circular, connect miscellaneous part if desired herein, then also need shaping is carried out at the bend pipe position, increased operation, also increased operation easier.
Summary of the invention
The invention solves to need in traditional pipe bending technique to fill causes the filler loss serious, and activity time is long, the high shortcoming of the crooked cost of pipe fitting, a kind of use cold-stamped processing mode is provided, can repeat to use continuously, activity time is short, crooked lower-cost metal bends cold extruding and forming device.
The present invention has also solved the mandrel that uses in the prior art need be equipped with shaping tool separately, has increased operation, also increases the shortcoming of operation easier, a kind of once just energy moulding is provided, and in the end one going on foot the metal bends cold extruding and forming device that carries out shaping, activity time is few, and is simple to operate.
The technical solution adopted for the present invention to solve the technical problems is: a kind of metal bends cold extruding and forming device, comprise mould by two mutual amalgamations of template, be provided with in the mould and the suitable die cavity of finished product elbow shape, the exterior of die cavity and mould, shaped device also comprises the extruding core rod that can insert die cavity and is used to promote the plug that pushes away of the interior pipe fitting to be processed of die cavity, the extruding core rod comprises standard shaft and working end, the internal diameter of standard shaft and die cavity is suitable, a gap that equates with tube wall thickness is left at least with the inwall of die cavity in the working end, the working end along standard shaft axial be projected as circle, internal diameter circular and pipe fitting to be processed matches.Pipe fitting to be processed pushes by pushing away plug from an end of die cavity, the end of pipe fitting is nested into the working end of extruding core rod gradually, lead to pipe fitting in the working end, the inwall of working end and die cavity mutually combines and limits the curved course of pipe fitting, gap between mould intracavity wall and the working end guarantees that pipe fitting has enough spaces to extend, after the pipe fitting bending, core rod will withdraw from, the internal diameter of standard shaft and die cavity matches and makes standard shaft not withdraw from smoothly deflection can to occur, thereby can guarantee between working end and the mould intracavity wall the gap consistently, the axis projection of working end is circular, can repair pipe fitting after the working end is withdrawed from like this, makes the end of pipe fitting be circle; End with pipe fitting is squeezed into a specific shape if desired, axis projection shape by changing the working end just can well be in the end one goes on foot and repairs, the end of guaranteeing pipe fitting finally meets the requirements, mould is made up of two templates, can pipe fitting be taken out die sinking after making things convenient for the pipe fitting bending, the shape of the die cavity in the mould can be multiple, such as right angle or obtuse angle, also may form the acute angle bending sometimes; Pipe fitting pushes crooked one-shot forming, does not need cooling, and the crooked time is few, simple to operate, the efficient height, and also finally the shape of the end of pipe fitting relatively meets the requirements, and precision is higher.
As preferably, the working end is surrounded by many curved surfaces, the working end comprises transition part that links to each other with standard shaft and the introduction part that is connected by turnover face with transition part, introduction part be provided with the suitable first surface of the lateral surface of bend pipe crooked position and with the second suitable curved surface of medial surface of bend pipe bending, second curved surface increases to the distolateral radial dimension of work gradually from the standard shaft side.When pipe fitting is crooked, two actions will be finished in the working end of core rod, pipe fitting to be imported and forms a preliminary crooked shape earlier, then core rod can withdraw from, at this moment, the working end need be repaired the crooked position of bend pipe, make being of the required size of pipe fitting bending part, bending radius such as bend pipe, the bending end diameter of bend pipe, finishing to bend pipe spare when the axis projection of work just can guarantee that for circle core rod withdraws from adheres to specification, the first surface of working end and second curved surface are consistent with the crooked position of bend pipe respectively, make the size conforms designing requirement of crooked position of bend pipe, the former straight tube before this of pipe fitting along first surface and the bending gradually of second curved surface, forms the lateral surface position and the medial surface position of bend pipe bending; When pipe fitting passes through the core rod bending, introduction part can play the effect of guiding, crooked gradually along the first surface and second curved surface, and the shape at the shape of the first surface and second curved surface and the corresponding position of bend pipe matches, bend pipe is not easy distortion in bending like this, the variation of the radial dimension of second curved surface can prevent the localized cracks that the quick bending of pipe fitting causes, and plays the effect of a buffering; Turnover face is the position that the radial dimension of working end from excessive portion to introduction part changes from small to big from large to small again and change herein.
As preferably, the edge of turnover face and the radial dimension at the corresponding position of bend pipe curved interior face less than with the radial dimension at the corresponding position of bend pipe curved outer.In the time of the pipe fitting bending, the bending radius of the medial surface of crooked position is less than the bending radius of lateral surface, therefore the curvature of medial surface changes the curvature variation greater than the outside, the radial dimension at the corresponding position of turnover face medial surface is less than the actual size of pipe fitting crooked position medial surface, by the variation herein of turnover face, can prevent that bend pipe from crackle taking place herein so that there is the buffering of a radian at the position of turnover face both sides.
As preferably, the working end is provided with introduction part, and introduction part is provided with the 3rd curved surface, and the 3rd curved surface is a symmetrical structure, and the line of symmetry of the 3rd curved surface is parallel with the axis of core rod.Core rod is when bending pipe fitting, use parts pipe fitting is pushed into introduction part, the 3rd curved surface is over against the end face of the relative introduction part of pipe fitting, the line of symmetry of the 3rd curved surface is parallel with the axis of core rod to make that this headed into parts when pipe fitting imported and is placed restrictions on by the 3rd curved surface, and the 3rd curved surface is returned pipe fitting and entered introduction part and play guide effect simultaneously.
As preferably, the face of cylinder of the 3rd curved surface for matching with bend pipe end inner surface, the 3rd curved surface is corresponding with first surface, and the 3rd curved surface is connected with the edge of second curved surface, is provided with fillet surface between the 3rd curved surface and the first surface.The 3rd curved surface is the face of cylinder, effect is better when the extruding core rod withdraws from finishing, precision is higher, fillet surface connects first surface and the 3rd curved surface, also can play guide effect to pipe fitting, fillet surface makes that the connecting portion between first surface and the 3rd curved surface is a rounding off, can not have the sword limit, therefore can not cause cut to the inner surface of pipe fitting.
As preferably, the working end comprises transition part, transition part comprise with the corresponding inner transition curved surface of bend pipe curved interior and with the corresponding outside of bend pipe curved outside fillet surface, the inner transition curved surface increases to turnover face N-Side surf radian gradually from the standard shaft side.Pipe fitting begins bending when introduction part imports, consider that quick crooked meeting cause crackle to pipe fitting, in bending, to there be the position of a buffering to prevent quick bending, transition part just can play buffering in the pipe fitting bending, pipe fitting is expanded by transition part gradually through behind the turnover face, and moves closer to final shape, withdrawing shaping by the working end at last, by the expansion of transition part, the working end shaping is just than being easier to, and resistance ratios is less.
As preferably, the outside fillet surface of transition part is the structure of indent at the position near the standard shaft side, and outside fillet surface becomes big at the indent position gradually to the radial dimension between the turnover face; The inner transition curved surface is a symmetrical structure, and line of symmetry is on the axial vane surface of core rod.The indent position becomes the position of outside fillet surface radial dimension minimum, and by outside fillet surface, the lateral surface location bending to the inside that makes the pipe fitting bending carries out shaping by the working end when core rod withdraws from, thus the resistance that reduces to withdraw from; Core rod generally scribbles lubricating oil in order to reduce resistance in to the pipe fitting bending.
As preferably, the angle of bend of die cavity is 90 °, and the end of standard shaft is provided with boss, and the boss outside is the end of thread, is provided with escape between the end of thread and the boss.Core rod is connected with power set by screw thread, drives the core rod motion by power set, can control the thrust of core rod motion simultaneously.
As preferably, the small cylinder of the end that pushes away plug for matching with the pipe fitting internal diameter pushes away the large cylinder that the middle part of plug matches for the diameter with die cavity, and the tail end that pushes away plug is provided with boss, the boss outside is the end of thread, is provided with escape between the end of thread and the boss.Small cylinder is inserted into pipe fitting end pipe fitting is pushed into die cavity, by pushing away plug pipe fitting is cooperated the formation bend with the extruding core rod inward gradually, the end of thread can be connected with power set, is driven by power set and pushes away plug, can control simultaneously to push away plug and retreat.
The invention has the beneficial effects as follows: the axis projection of working end is for circular, can repair pipe fitting after the working end is withdrawed from like this, make the end of pipe fitting be circle, pipe fitting pushes crooked one-shot forming, does not need cooling, and the crooked time is few, simple to operate, the efficient height, and finally the shape of the end of pipe fitting relatively meets the requirements, and precision is higher.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is a kind of perspective view of pushing core rod of the present invention;
Fig. 3 is the upward view of the present invention's extruding core rod shown in Figure 2;
Fig. 4 is the side view of the present invention's extruding core rod shown in Figure 3;
Fig. 5, be a kind of structural representation that pushes away plug of the present invention;
Fig. 6 is the cutaway view of a kind of pipe fitting of the present invention;
Fig. 7 is the view that a kind of pipe fitting of the present invention enters introduction part;
Fig. 8 is the view of a kind of pipe fitting bending of the present invention;
To be that the present invention is a kind of push the view that core rod withdraws from finishing to Fig. 9;
Among the figure: 1, standard shaft, 2, the working end, 3, transition part, 4, introduction part, 5, the 3rd curved surface, 6, fillet surface, 7, first surface, 8, second curved surface, 9, turnover face, 10, the inner transition curved surface, 11, outside fillet surface, 13, boss, 14, the end of thread, 15, joint face, 16, the extruding core rod, 17, template, 18, push away plug, 19, die cavity, 20, small cylinder, 21, large cylinder, 22, pipe fitting, 23, the inclined-plane.
The specific embodiment
Below by specific embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: a kind of metal bends cold extruding and forming device (referring to accompanying drawing 1), comprise mould by the 17 mutual amalgamations of two templates, be provided with in the mould and the suitable die cavity 19 of finished product elbow shape, be inserted with extruding core rod 16 in the die cavity 19 and push away plug 18.
The extruding core rod comprises that standard shaft 1 and working end 2(are referring to accompanying drawing 2 accompanying drawings 3 Fig. 4), extruding core rod integral body is cylindrical, working end 2 is an eccentric structure, the tail end of standard shaft 1 is provided with boss 13, boss 13 outsides are the end of thread 14, be provided with escape between the end of thread 14 and the boss 13, working end 2 is divided into transition part 3 that is connected with standard shaft and the introduction part 4 that is connected by turnover face 9 as end and transition part, working end 2 is surrounded by many curved surfaces, working end 2 is circular along the axis projection of standard shaft, circular diameter and bend pipe internal diameter are suitable, transition part 3 comprise with the corresponding inner transition curved surface of bend pipe curved interior 10 and with the corresponding outside of bend pipe curved outside fillet surface 11, inner transition curved surface 10 increases to turnover face N-Side surf radian gradually from the standard shaft side, inner transition curved surface 10 is a symmetrical structure, line of symmetry is on the axial vane surface of extruding core rod 16, outside fillet surface 11 radially projectings are drops (referring to accompanying drawing 3), outside fillet surface 11 is the structure of indent at the position near the standard shaft side, outside fillet surface becomes big at the indent position gradually to the radial dimension between the turnover face, introduction part 4 comprise with the suitable first surface of the lateral surface of bend pipe crooked position 7 and with the second suitable curved surface 8 of medial surface of bend pipe bending, second curved surface 8 increases to the distolateral radial dimension of work gradually from the standard shaft side, the radial dimension at the edge of turnover face 9 and the corresponding position of bend pipe curved interior face less than with the radial dimension at the corresponding position of bend pipe curved outer, introduction part 4 is provided with and first surface 7 corresponding the 3rd curved surfaces 5, the 3rd curved surface 5 is connected with the edge of second curved surface 8, the 3rd curved surface 5 is a symmetrical structure, the line of symmetry of the 3rd curved surface 5 is parallel with the axis of core rod, the 3rd curved surface 5 is the suitable arc surface of R in the elbow with pipe, is provided with fillet surface 6 between the 3rd curved surface and the first surface.
Push away plug 18(referring to accompanying drawing 5) the small cylinder 20 of end for matching with the pipe fitting internal diameter, the large cylinder 21 that the middle part that pushes away plug matches for the diameter with die cavity, the tail end that pushes away plug is provided with boss 13, and the boss outside is the end of thread 14, is provided with escape between the end of thread and the boss.
Pipe fitting 22(to be processed is referring to accompanying drawing 6) axial cross section be trapezoidal, the two ends of pipe fitting are inclined-plane 23, the length of corresponding crooked position inboard is distorted the length in the outside, position on the pipe fitting less than correspondence.
The procedure of processing of pushing bend pipe (referring to accompanying drawing 7 accompanying drawings 8 accompanying drawings 9): the inlet of earlier pipe fitting 22 being put into die cavity, the small cylinder that pushes away plug is inserted into the end of pipe fitting, the extruding core rod inserts from the other end of die cavity, promotion pushes away plug, the crooked position that pushes away the past die cavity of plug promotion pipe fitting moves, pipe fitting is nested into the introduction part of pressurization core rod gradually, the corresponding site of pipe fitting is respectively along the first surface and the second curved surface bending, pipe fitting has been the portion of crossing and expansion gradually through entering behind the turnover face, control well and push away the length that plug enters die cavity, after arriving correct position, push away plug and stop, then pushing core rod and withdraw from, the extruding core rod is in the process that withdraws from, repair the crooked position of pipe fitting the working end, finally obtains satisfactory metal bends, and the shape at the two ends of metal bends all is circular.
Above-described embodiment is a kind of preferred version of the present invention, is not the present invention is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim puts down in writing.
Claims (9)
1. metal bends cold extruding and forming device, comprise mould by two mutual amalgamations of template, be provided with in the mould and the suitable die cavity of finished product elbow shape, it is characterized in that, the exterior of die cavity and mould, shaped device also comprises the extruding core rod that can insert die cavity and is used to promote the plug that pushes away of the interior pipe fitting to be processed of die cavity, the extruding core rod comprises standard shaft and working end, the internal diameter of standard shaft and die cavity is suitable, a gap that equates with tube wall thickness is left at least with the inwall of die cavity in the working end, the working end along standard shaft axial be projected as circle, internal diameter circular and pipe fitting to be processed is wanted to coincide.
2. metal bends cold extruding and forming device according to claim 1, it is characterized in that the working end is surrounded by many curved surfaces, the working end comprises transition part that links to each other with standard shaft and the introduction part that is connected by turnover face with transition part, introduction part be provided with the suitable first surface of the lateral surface of bend pipe crooked position and with the second suitable curved surface of medial surface of bend pipe bending, second curved surface increases to the distolateral radial dimension of work gradually from the standard shaft side.
3. metal bends cold extruding and forming device according to claim 2, the edge that it is characterized in that the face of transferring and the radial dimension at the corresponding position of bend pipe curved interior face less than with the radial dimension at the corresponding position of bend pipe curved outer.
4. according to claim 1 or 2 or 3 described metal bends cold extruding and forming devices, it is characterized in that the working end is provided with introduction part, introduction part is provided with the 3rd curved surface, and the 3rd curved surface is a symmetrical structure, and the line of symmetry of the 3rd curved surface is parallel with the axis of core rod.
5. metal bends cold extruding and forming device according to claim 4, it is characterized in that the 3rd curved surface is the face of cylinder that matches with bend pipe end inner surface, the 3rd curved surface is corresponding with first surface, the 3rd curved surface is connected with the edge of second curved surface, is provided with fillet surface between the 3rd curved surface and the first surface.
6. according to claim 1 or 2 or 3 described metal bends cold extruding and forming devices, it is characterized in that the working end comprises transition part, transition part comprise with the corresponding inner transition curved surface of bend pipe curved interior and with the corresponding outside of bend pipe curved outside fillet surface, the inner transition curved surface increases to turnover face N-Side surf radian gradually from the standard shaft side.
7. metal bends cold extruding and forming device according to claim 6 is characterized in that the outside fillet surface of transition part is the structure of indent at the position near the standard shaft side, and outside fillet surface becomes big at the indent position gradually to the radial dimension between the turnover face; The inner transition curved surface is a symmetrical structure, and line of symmetry is on the axial vane surface of core rod.
8. metal bends cold extruding and forming device according to claim 1, the angle of bend that it is characterized in that die cavity is 90 °, and the end of standard shaft is provided with boss, and the boss outside is the end of thread, is provided with escape between the end of thread and the boss.
9. according to claim 1 or 2 or 3 or 8 described metal bends cold extruding and forming devices, the small cylinder of the end that it is characterized in that pushing away plug for matching with the pipe fitting internal diameter, the large cylinder that the middle part that pushes away plug matches for the diameter with die cavity, the tail end that pushes away plug is provided with boss, the boss outside is the end of thread, is provided with escape between the end of thread and the boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102823490A CN101954389B (en) | 2010-09-16 | 2010-09-16 | Metal elbow cold extrusion molding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102823490A CN101954389B (en) | 2010-09-16 | 2010-09-16 | Metal elbow cold extrusion molding device |
Publications (2)
| Publication Number | Publication Date |
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| CN101954389A true CN101954389A (en) | 2011-01-26 |
| CN101954389B CN101954389B (en) | 2012-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102823490A Expired - Fee Related CN101954389B (en) | 2010-09-16 | 2010-09-16 | Metal elbow cold extrusion molding device |
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| CN (1) | CN101954389B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102537536A (en) * | 2012-02-09 | 2012-07-04 | 三一重工股份有限公司 | Composite bending-straight tube, concrete pump truck and manufacture method of composite bending-straight tube |
| CN102699161A (en) * | 2012-06-12 | 2012-10-03 | 湖州剑力金属制品有限公司 | Workpiece rotating stamping die |
| CN102886391A (en) * | 2012-11-06 | 2013-01-23 | 中国矿业大学 | Method for preparing small-aperture magnesium alloy pipe fitting |
| CN106552848A (en) * | 2016-11-14 | 2017-04-05 | 芜湖通和汽车管路系统股份有限公司 | For the core muscle of automobile pipeline bending |
| CN110756633A (en) * | 2018-07-25 | 2020-02-07 | 丛华 | Combined mold core structure for cold-push forming of straight pipe elbow |
| CN112474874A (en) * | 2020-11-09 | 2021-03-12 | 乐清市如意紧固件有限公司 | Metal pipe fitting extrusion forming method and forming system |
| CN112705602A (en) * | 2020-12-08 | 2021-04-27 | 浙江嘉达机械制造有限公司 | Bent pipe machining process |
| CN112893557A (en) * | 2021-02-25 | 2021-06-04 | 南京工程学院 | Copper pipe bending device based on lead pouring process and pipe bending method thereof |
| CN113145704A (en) * | 2020-01-22 | 2021-07-23 | 双叶产业株式会社 | Bent pipe manufacturing device and bent pipe manufacturing method |
| CN114147135A (en) * | 2020-12-04 | 2022-03-08 | 日升工业株式会社 | Method for manufacturing bent pipe |
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| CN110369541B (en) * | 2019-08-05 | 2020-06-23 | 燕山大学 | Axial and radial alternating equal-channel extrusion die and using method thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102537536A (en) * | 2012-02-09 | 2012-07-04 | 三一重工股份有限公司 | Composite bending-straight tube, concrete pump truck and manufacture method of composite bending-straight tube |
| CN102699161A (en) * | 2012-06-12 | 2012-10-03 | 湖州剑力金属制品有限公司 | Workpiece rotating stamping die |
| CN102699161B (en) * | 2012-06-12 | 2014-09-24 | 湖州剑力金属制品有限公司 | Workpiece rotating stamping die |
| CN102886391A (en) * | 2012-11-06 | 2013-01-23 | 中国矿业大学 | Method for preparing small-aperture magnesium alloy pipe fitting |
| CN102886391B (en) * | 2012-11-06 | 2014-11-05 | 中国矿业大学 | Method for preparing small-aperture magnesium alloy pipe fitting |
| CN106552848A (en) * | 2016-11-14 | 2017-04-05 | 芜湖通和汽车管路系统股份有限公司 | For the core muscle of automobile pipeline bending |
| CN110756633A (en) * | 2018-07-25 | 2020-02-07 | 丛华 | Combined mold core structure for cold-push forming of straight pipe elbow |
| CN110756633B (en) * | 2018-07-25 | 2024-03-29 | 丛华 | Combined mold core structure for cold-pushing forming straight pipe elbow |
| CN113145704A (en) * | 2020-01-22 | 2021-07-23 | 双叶产业株式会社 | Bent pipe manufacturing device and bent pipe manufacturing method |
| CN113145704B (en) * | 2020-01-22 | 2022-11-08 | 双叶产业株式会社 | Bent pipe manufacturing device and bent pipe manufacturing method |
| CN112474874A (en) * | 2020-11-09 | 2021-03-12 | 乐清市如意紧固件有限公司 | Metal pipe fitting extrusion forming method and forming system |
| CN114147135A (en) * | 2020-12-04 | 2022-03-08 | 日升工业株式会社 | Method for manufacturing bent pipe |
| CN112705602A (en) * | 2020-12-08 | 2021-04-27 | 浙江嘉达机械制造有限公司 | Bent pipe machining process |
| CN112893557A (en) * | 2021-02-25 | 2021-06-04 | 南京工程学院 | Copper pipe bending device based on lead pouring process and pipe bending method thereof |
Also Published As
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| CN101954389B (en) | 2012-08-29 |
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