CN105234244A - Hydraulic control tee joint rigid-plastic compounded bulging equipment - Google Patents

Hydraulic control tee joint rigid-plastic compounded bulging equipment Download PDF

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Publication number
CN105234244A
CN105234244A CN201510347595.2A CN201510347595A CN105234244A CN 105234244 A CN105234244 A CN 105234244A CN 201510347595 A CN201510347595 A CN 201510347595A CN 105234244 A CN105234244 A CN 105234244A
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CN
China
Prior art keywords
bulging
push rod
drift
cylinder
forming cavity
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Pending
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CN201510347595.2A
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Chinese (zh)
Inventor
刘胜利
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XINCHANG HANGDA MACHINERY MANUFACTURING Co Ltd
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XINCHANG HANGDA MACHINERY MANUFACTURING Co Ltd
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Priority to CN201510347595.2A priority Critical patent/CN105234244A/en
Publication of CN105234244A publication Critical patent/CN105234244A/en
Pending legal-status Critical Current

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Abstract

Hydraulic control tee joint rigid-plastic compounded bulging equipment comprises an upper half die and a lower half die, wherein a forming cavity is arranged between the upper half die and the lower half die. The two ends of the forming cavity are each provided with a bulging squeezing punch head. The lower half die is provided with an axis branch pipe forming cavity, and a balance punch head is installed in the branch pipe forming cavity. A rigid bulging inner die is arranged between the two bulging squeezing punch heads and comprises push rods located at the two ends respectively, and a forming inner die block used for driving a pipe blank to bulge and deform is arranged between the two push rods. The forming inner die block is connected with the two push rods through a double-hinge connecting rod. The opposite ends of the two push rods are provided with connecting grooves facing an opening of the branch pipe forming cavity, and a limiting structure is arranged in each connecting groove. The push rods are installed in the corresponding bulging squeezing punch heads respectively in a sliding fit mode. A bulging liquid inlet and a bulging liquid outlet are formed in each bulging squeezing punch head. One push rod is provided with a rapid detachment and connection structure. Thrust devices are arranged at the two ends of the forming cavity respectively, and each thrust device comprises a hydraulic cylinder meeting the requirement.

Description

Hydraulically-controlled type three-way pipe firm plastic composite bulging equipment
Technical field
The invention belongs to tubing without Machining Technology for Cutting field, be specifically related to a kind of hydraulically-controlled type three-way pipe firm plastic composite bulging equipment.
Background technology
The kind of tube bulge is a lot, is mainly divided into rigidity bulging and soft mode bulging two class.Rigidity punch bulging is only applicable to the bulging processing of form and dimensional precision less demanding axial symmetry bulging part.When utilizing liquid, gas or elastomer to carry out bulging as transmission medium, be commonly referred to as soft mode bulging.Liquid usable oils, emulsion or water, elastomer adopts polyurethane rubber or natural rubber usually.Paraffin is easy in solid or liquid unique features owing to having, and recyclable recycling, also it can be used as bulging transmission medium, and achieve good technique effect aborning.Therefore, according to the difference of transmission medium, soft mode bulging can be divided into again hydraulic expanding-forming, barometric pressure load, rubber bulging and paraffin bulging etc.Soft mode bulging is compared with rigid mould bulging, is particularly suitable for various complex-shaped pipe fitting processing, has obvious technical economic benefit.
In three-way pipe bulging process, internal surface of bloom need act on very large bulging pressure.According to the production method of bulging pressure and the number of bulging drift and the difference of structure, the method for three-way pipe Plastic Forming can be divided into three kinds accordingly: liquid medium Extrusion bulging, plastic medium compound punch Extrusion bulging and plastic medium separate punches Extrusion bulging three kinds.
As shown in Figure 1, be the structural representation of existing a kind of three-way pipe liquid medium Extrusion bulging mould.This three-way pipe liquid medium Extrusion bulging mould is made up of two-half die, pipe is placed in one, inner liquid provides interior pressure by special pressure charging system, the motion of size and left and right two drifts of its force value has nothing to do, extruding force is provided by left and right drift, balance drift provides the equilibrant force of a tube end, by the coordinative role of these three power, can make pipe expansion forming under super-pressure hydrostatic pressure.The method due to bulging pressure field distribution the most uniform and stable, product quality formed thereby is best, but required bulging pressure is larger, need hundreds if not thousands of MPas, and Normal hydraulic pump can only produce the pressure of about 30MPa, therefore need pressure charging system be configured, also very high to the requirement of control technology, equipment is costly.In addition, liquid medium Extrusion bulging is shaped and can not be applied to as medium carbon steel, large scale heavy section casting etc. need heating to improve plasticity, to reduce the bulging processing of drag.
As shown in Figure 2, be the structural representation of existing a kind of plastic medium compound punch Extrusion bulging mould.The drift of this expanding die is a terraced structure, can exert pressure respectively to medium and tube wall two ends.During Extrusion bulging, first punch head enters in pipe and exerts pressure to plastic medium, makes the corresponding tube wall protuberance of arm die cavity produce bulging, when drift step contacts with pipe, produce extruding force, pipe produces plastic deformation under the acting in conjunction of interior pressure and extruding force, and arm is constantly increased.
This expansion forming method, except having that punch structure is simple, except equipment needed thereby and the advantage such as device is less, operation is convenient, also has the advantage that wall ratio is more uniform and stable, amplitude of variation is little of product.Because the size relationship extruding drift, die, pipe and bulging medium decides the initial pressure of bulging, therefore in forming process, the adjustment of bulging pressure is comparatively difficult, can only carry out within the specific limits, is mainly realized by the structure of extruding drift of asking permission to absent oneself briefly.Therefore, comparatively strict to the requirement of the aspects such as the size of pipe, material and mould, there is significant limitation in using.
As shown in Figure 3, be the structural representation of existing a kind of plastic medium separate punches Extrusion bulging mould.The interior pressure of this expanding die is produced by bulging drift Extrusion bulging medium, and its numerical value has nothing to do with extruding drift and determined by the motion of bulging drift.The mechanism of production of bulging pressure is shaped similar to plastic medium compound punch Extrusion bulging, and the difference of the two is mainly whether extruding drift and bulging drift are integrated.In plastic medium separate punches extrusion forming method, extruding drift and bulging drift are driven by composite oil cylinder, realize being separated.
Compared with being shaped with plastic medium compound punch Extrusion bulging, the structure of the bulging drift of plastic medium separate punches Extrusion bulging mould and motion are comparatively complicated, and need increase a set of driving bulging and rush cephalomotor mechanism.
Compared with liquid medium Extrusion bulging mode, although the motion of plastic medium separate punches Extrusion bulging drift is comparatively complicated, but avoid expensive hydraulic pressure boosting system, therefore there is equipment investment less, and the advantage that productivity ratio is high, forming effect is good, but it also exists that the service life of drift is lower, mould structure is more complicated and can not be applied to the too little occasion of tube blank size.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of hydraulically-controlled type three-way pipe firm plastic composite bulging equipment, the expansion forming requirement of three-way pipe can not only be met, and simultaneously in conjunction with rigidity bulging and hydraulic expanding-forming, the overall process of three-way pipe bulging distortion can be controlled preferably.
For achieving the above object, the invention provides following technical scheme:
A kind of hydraulically-controlled type three-way pipe firm plastic composite bulging equipment, comprise upper mold section and female die, cylindrical shaping die cavity is provided with between described upper mold section and female die, the two ends of described shaping die cavity are separately installed with the bulging extruding drift be slidably matched with it, described female die is provided with the arm forming cavity of the intersect vertical axis of axis and described shaping die cavity, in described arm forming cavity, balance drift is installed, rigidity bulging internal mold is provided with between two described bulging extruding drifts, described rigidity bulging internal mold comprises the push rod laying respectively at two ends, be provided with between two described push rods and coordinate with described arm forming cavity and shaping inner module for driving pipe bulging to be out of shape, be connected by two hinge bar between described shaping inner module with two described push rods, two described push rod one end are in opposite directions provided with the link slot towards arm forming cavity opening, are provided with the position limiting structure of the dead in line for preventing two described pair of hinge bars in described link slot, the axis of described push rod and the axis being parallel of described shaping die cavity are also slidably installed respectively and extrude in drift at corresponding described bulging, bulging liquid entrance and the outlet of bulging liquid is provided with in described bulging extruding drift, wherein a push rod is provided with quick-detachment syndeton, and the two ends of described shaping die cavity are respectively equipped with the thrust device for driving described bulging extruding drift to slide in described shaping die cavity and for driving described push rod to slide in described bulging extruding drift,
Described thrust device comprises composite hydraulic cylinder, described composite hydraulic cylinder comprises outer cylinder body, the center of described outer cylinder body is provided with the inner cylinder body coaxial with it, be provided with in described inner cylinder body and be slidably matched and the inner piston rod be connected with corresponding described push rod with it, be provided with in described outer cylinder body and be slidably matched with it and extrude with corresponding described bulging the outer piston bar that drift is fixedly connected with, described outer piston bar is slidably matched and is sleeved on described inner cylinder body.
Further, described push rod and described bulging extrude between drift and are provided with high pressure seal structure.
Further, the described push rod split being provided with described quick-detachment syndeton is set to two sections, wherein the end face center of one section of described push rod is provided with a taper combined hole, the end face center of another section of described push rod is provided with the taper joint head coordinated with described taper combined hole, and is provided with antislip body between the end face of two sections of described push rods.
Further, the bottom land of described link slot is in the inclined ramp of dead in line preventing two described pair of hinge bars, or described position limiting structure comprises and to be arranged in described link slot and for preventing the limited block of the dead in line of two described pair of hinge bars.
Further, described bulging liquid entrance and the outlet of bulging liquid are separately positioned in two described bulging extruding drifts.
Beneficial effect of the present invention is:
Hydraulically-controlled type three-way pipe of the present invention firm plastic composite bulging equipment, by arranging rigidity bulging internal mold between two bulging extruding drifts, during use, pipe is placed in shaping die cavity, rigidity bulging internal mold correspondence is arranged in pipe, the two ends of pipe utilize bulging to extrude drift press seal respectively, and fill liquid medium in pipe; During bulging, utilize thrust device driving bulging extruding drift to apply axial extruding force to pipe, accurately can be controlled the pressure of liquid medium in shaping die cavity by bulging liquid entrance and the outlet of bulging liquid, and then the accurate liquid bulging pressure controlling pipe and be subject to; In addition, the motion of push rod also can drive shaping inner module to the motion of arm forming cavity, and shaping inner module applies rigidity bulging power to the bulging deformed region of pipe, under the acting in conjunction of rigidity bulging power and liquid bulging pressure, drive the distortion of pipe bulging, and then be configured as three-way pipe; Link slot is set by the end at push rod, and position limiting structure is set in link slot, the dead in line of two two hinge bars can be prevented, avoid occurring dead point, namely can guarantee that push rod pushes shaping inner module to arm forming cavity; Owing to have employed rigidity bulging internal mold, rigidity bulging power is applied to pipe, suitably can reducing the size of liquid medium to the liquid bulging pressure that pipe applies, thus can reducing the cost because arranging supercharging equipment; And the movement rate of shaping inner module and stroke all can by the motion controls of push rod, thus, hydraulically-controlled type three-way pipe of the present invention firm plastic composite bulging equipment can control the overall process of three-way pipe bulging distortion preferably; In addition, by arranging bulging liquid entrance and the outlet of bulging liquid in bulging extruding drift, the amount of the liquid medium in adjustable forming recess, do not mate between the space preventing the forming recess space increments because push rod occupies and the distortion of pipe bulging from increasing and liquid bulging pressure oscillation that the liquid medium that causes exports, make expansion forming process more stable; And under the effect of liquid bulging pressure, pipe is in expansion forming process, and its inwall all can be subject to the effect of liquid bulging pressure, can fit with the inwall of shaping die cavity and arm forming cavity after pipe distortion, forming quality is better.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the structural representation of existing a kind of three-way pipe liquid medium Extrusion bulging mould;
Fig. 2 is the structural representation of existing a kind of plastic medium compound punch Extrusion bulging mould;
Fig. 3 is the structural representation of existing a kind of plastic medium separate punches Extrusion bulging mould;
Fig. 4 is the structural representation of hydraulically-controlled type three-way pipe of the present invention firm plastic composite bulging apparatus embodiments;
Fig. 5 is the A detail drawing of Fig. 4;
Fig. 6 is the B detail drawing of Fig. 4.
Description of reference numerals:
1-upper mold section; 2-female die; 3-shaping die cavity; 4-bulging extruding drift; 5-arm forming cavity; 6-balances drift; 7-pipe; 8-push rod; 9-shaping inner module; The two hinge bar of 10-; 11-taper combined hole; 12-taper joint head; 13-antislip body; 14-outer cylinder body; 15-inner cylinder body; 16-inner piston rod; 17-outer piston bar; 18-link slot; 19-inclined ramp; 20-bulging liquid entrance; 21-bulging liquid exports.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described, can better understand the present invention and can be implemented, but illustrated embodiment is not as a limitation of the invention to make those skilled in the art.
As shown in Figure 4, be the structural representation of hydraulically-controlled type three-way pipe of the present invention firm plastic composite bulging apparatus embodiments.The hydraulically-controlled type three-way pipe firm plastic composite bulging equipment of the present embodiment, comprise upper mold section 1 and female die 2, cylindrical shaping die cavity 3 is provided with between upper mold section 1 and female die 2, the two ends of shaping die cavity 3 are separately installed with the bulging extruding drift 4 be slidably matched with it, female die 1 is provided with the arm forming cavity 5 of the intersect vertical axis of axis and shaping die cavity 3, the inwall of arm forming cavity 5 is cylindrical, balance drift 6 is installed in arm forming cavity 5, rigidity bulging internal mold is provided with between two bulging extruding drifts 4, rigidity bulging internal mold comprises the push rod 8 laying respectively at two ends, be provided with between two push rods 8 and coordinate with arm forming cavity 5 and shaping inner module 9 for driving pipe 7 bulging to be out of shape, by two hinge bar 10 between shaping inner module 9 and two push rods 8, namely be connected by two hinge bar 10 between push rod 8 with shaping inner module 9, two push rod 8 one end are in opposite directions provided with the link slot 18 towards arm forming cavity 5 opening, the position limiting structure of the dead in line for preventing two two hinge bars 10 is provided with in link slot 18.The bottom land of the link slot 18 of the present embodiment in the inclined ramp 19 of dead in line preventing two two hinge bars 10, as shown in Figure 6.Certainly, position limiting structure also can adopt other versions, as position limiting structure comprise be arranged on as described in link slot 18 and for preventing the limited block of the dead in line of two two hinge bars 10, its principle is suitable, is not repeated.
The axis of push rod 8 and the axis being parallel of shaping die cavity 3 are also slidably installed respectively and extrude in drift 4 at corresponding bulging, namely two push rods 8 are slidably installed respectively in two bulging extruding drifts 4, be provided with bulging liquid entrance 20 and bulging liquid outlet 21 in bulging extruding drift 4, the bulging liquid entrance 20 of the present embodiment and bulging liquid outlet 21 are separately positioned in two bulging extruding drifts 4.Wherein a push rod 8 is provided with quick-detachment syndeton, push rod 8 split that the present embodiment is provided with quick-detachment syndeton is set to two sections, wherein the end face center of one section of push rod 8 is provided with a taper combined hole 11, the end face center of another section of push rod 8 is provided with the taper joint head 12 coordinated with taper combined hole 11, and be provided with antislip body 13 between the end face of two sections of push rods 8, because push rod 8 is only subject to the effect of axial thrust, thus utilize taper combined hole 11 and taper joint head 12 can separation fast between sight line two ends push rod 8 and combination.By arranging quick-detachment syndeton, pipe 7 can be made to be sleeved on rigidity bulging internal mold from the push rod 8 be separated.
The two ends of shaping die cavity 3 are respectively equipped with the thrust device for driving bulging extruding drift 4 to slide in shaping die cavity 3 and for driving push rod 8 to slide in bulging extruding drift 4.The thrust device of the present embodiment comprises composite hydraulic cylinder, this composite hydraulic cylinder comprises outer cylinder body 14, the center of outer cylinder body 14 is provided with the inner cylinder body 15 coaxial with it, be provided with in inner cylinder body 15 and be slidably matched and the inner piston rod 16 be connected with corresponding push rod 8 with it, be provided with in outer cylinder body 14 and be slidably matched with it and extrude with corresponding bulging the outer piston bar 17 that drift 4 is fixedly connected with, outer piston bar 17 is slidably matched and is sleeved on inner cylinder body 15.So, the two ends that outer piston bar 17 just can be utilized to drive bulging to extrude drift 4 pairs of pipes 7 apply extruding force effect respectively, inner piston rod 16 is utilized to drive push rod to slide in bulging extruding drift 4, and then making the liquid medium being full of pipe 7 inside apply liquid bulging pressure to pipe 7 and drive shaping inner module 9 to move to arm forming cavity 5, the bulging deformed region to pipe 7 applies rigidity bulging power.Certainly, the Driven by Hydraulic Cylinder bulging of other versions also can be adopted to extrude drift 4 for thrust device and push rod 8 moves, move as adopted a center Driven by Hydraulic Cylinder push rod 8, move at the uniform multiple outer Driven by Hydraulic Cylinder bulging extruding drift 4 of central liquid cylinder pressure outer ring again, its principle is suitable, is not repeated.Preferably, the push rod 8 of the present embodiment and bulging extrude between drift 4 and are provided with high pressure seal structure, certainly, be also provided with hermetically-sealed construction, can prevent liquid medium from leaking between bulging extruding drift 4 and the inwall of shaping die cavity 3.In addition, after outer piston bar 17 bounces back, quick-detachment syndeton can be outside exposed, is convenient to install pipe 7 and the three-way pipe after taking off shaping.
The hydraulically-controlled type three-way pipe firm plastic composite bulging equipment of the present embodiment, by arranging rigidity bulging internal mold between two bulging extruding drifts 4, during use, pipe 7 is placed in shaping die cavity 3, rigidity bulging internal mold correspondence is arranged in pipe 7, the two ends of pipe 7 utilize bulging to extrude drift 4 press seal respectively, and fill liquid medium in pipe 7; During bulging, composite hydraulic cylinder is utilized to drive bulging extruding drift 4 pairs of pipes 7 to apply axial extruding force, the pressure of liquid medium in shaping die cavity accurately can be controlled by bulging liquid entrance 20 and bulging liquid outlet 21, and then the accurate liquid bulging pressure controlling pipe and be subject to; In addition, the motion of push rod 8 also can drive shaping inner module 9 to move to arm forming cavity 5, and shaping inner module 9 applies rigidity bulging power to the bulging deformed region of pipe 7, under the acting in conjunction of rigidity bulging power and liquid bulging pressure, drive the distortion of pipe 7 bulging, and then be configured as three-way pipe.By arranging link slot 18 in the end of push rod 8, and position limiting structure being set in link slot 18, the dead in line of two two hinge bars 10 can being prevented, avoid occurring dead point, namely can guarantee that push rod 8 pushes shaping inner module 9 to arm forming cavity 5.Owing to have employed rigidity bulging internal mold, rigidity bulging power is applied to pipe, suitably can reducing the size of liquid medium to the liquid bulging pressure that pipe 7 applies, thus can reducing the cost because arranging supercharging equipment; And the movement rate of shaping inner module 9 and stroke all can by the motion controls of push rod 8, thus, the present embodiment hydraulically-controlled type three-way pipe firm plastic composite bulging equipment can control the overall process of three-way pipe bulging distortion preferably; In addition, by arranging bulging liquid entrance 20 and bulging liquid outlet 21 in bulging extruding drift 4, the amount of the liquid medium in adjustable forming recess 3, do not mate between the space preventing the forming recess space increments because push rod 8 occupies and the distortion of pipe 7 bulging from increasing and liquid bulging pressure oscillation that the liquid medium that causes exports, make expansion forming process more stable; And under the effect of liquid bulging pressure, pipe 7 is in expansion forming process, and its inwall all can be subject to the effect of liquid bulging pressure, pipe 7 can be fitted with the inwall of shaping die cavity 3 and arm forming cavity 5 after being out of shape, and forming quality is better.
The above embodiment is only that protection scope of the present invention is not limited thereto in order to absolutely prove the preferred embodiment that the present invention lifts.The equivalent alternative or conversion that those skilled in the art do on basis of the present invention, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.

Claims (5)

1. a hydraulically-controlled type three-way pipe firm plastic composite bulging equipment, comprise upper mold section and female die, cylindrical shaping die cavity is provided with between described upper mold section and female die, the two ends of described shaping die cavity are separately installed with the bulging extruding drift be slidably matched with it, described female die is provided with the arm forming cavity of the intersect vertical axis of axis and described shaping die cavity, in described arm forming cavity, balance drift is installed, it is characterized in that: between two described bulging extruding drifts, be provided with rigidity bulging internal mold, described rigidity bulging internal mold comprises the push rod laying respectively at two ends, be provided with between two described push rods and coordinate with described arm forming cavity and shaping inner module for driving pipe bulging to be out of shape, be connected by two hinge bar between described shaping inner module with two described push rods, two described push rod one end are in opposite directions provided with the link slot towards arm forming cavity opening, are provided with the position limiting structure of the dead in line for preventing two described pair of hinge bars in described link slot, the axis of described push rod and the axis being parallel of described shaping die cavity are also slidably installed respectively and extrude in drift at corresponding described bulging, bulging liquid entrance and the outlet of bulging liquid is provided with in described bulging extruding drift, wherein a push rod is provided with quick-detachment syndeton, and the two ends of described shaping die cavity are respectively equipped with the thrust device for driving described bulging extruding drift to slide in described shaping die cavity and for driving described push rod to slide in described bulging extruding drift,
Described thrust device comprises composite hydraulic cylinder, described composite hydraulic cylinder comprises outer cylinder body, the center of described outer cylinder body is provided with the inner cylinder body coaxial with it, be provided with in described inner cylinder body and be slidably matched and the inner piston rod be connected with corresponding described push rod with it, be provided with in described outer cylinder body and be slidably matched with it and extrude with corresponding described bulging the outer piston bar that drift is fixedly connected with, described outer piston bar is slidably matched and is sleeved on described inner cylinder body.
2. hydraulically-controlled type three-way pipe according to claim 1 firm plastic composite bulging equipment, is characterized in that: described push rod and described bulging extrude between drift and be provided with high pressure seal structure.
3. hydraulically-controlled type three-way pipe according to claim 1 firm plastic composite bulging equipment, it is characterized in that: the described push rod split being provided with described quick-detachment syndeton is set to two sections, wherein the end face center of one section of described push rod is provided with a taper combined hole, the end face center of another section of described push rod is provided with the taper joint head coordinated with described taper combined hole, and is provided with antislip body between the end face of two sections of described push rods.
4. hydraulically-controlled type three-way pipe according to claim 1 firm plastic composite bulging equipment, it is characterized in that: the bottom land of described link slot is in the inclined ramp of dead in line preventing two described pair of hinge bars, or described position limiting structure comprises and to be arranged in described link slot and for preventing the limited block of the dead in line of two described pair of hinge bars.
5. the hydraulically-controlled type three-way pipe firm plastic composite bulging equipment according to any one of claim 1-4, is characterized in that: described bulging liquid entrance and the outlet of bulging liquid are separately positioned in two described bulging extruding drifts.
CN201510347595.2A 2015-06-19 2015-06-19 Hydraulic control tee joint rigid-plastic compounded bulging equipment Pending CN105234244A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106984688A (en) * 2017-05-31 2017-07-28 佛山市南海鼎标精工机械有限公司 A kind of three-way pipe water swelling mould

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CN103920789A (en) * 2014-05-06 2014-07-16 哈尔滨工业大学 Internal high pressure forming die and method of elbow T-branch pipe
CN104084469A (en) * 2014-06-25 2014-10-08 温州蓝天管件阀门有限公司 Tee pipe hydraulic molding device
CN203917556U (en) * 2014-06-25 2014-11-05 温州蓝天管件阀门有限公司 A kind of automatic pressure relief device of hydraulic extrusion press for three-way pipe fitting

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Publication number Priority date Publication date Assignee Title
JP2006000870A (en) * 2004-06-15 2006-01-05 Toyota Motor Corp Hydraulic forming apparatus and fluid pressure control method therefor
CN203316638U (en) * 2013-06-06 2013-12-04 重庆科技学院 Automobile drive axle integral combination external driving type bulging device
CN103920789A (en) * 2014-05-06 2014-07-16 哈尔滨工业大学 Internal high pressure forming die and method of elbow T-branch pipe
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106984688A (en) * 2017-05-31 2017-07-28 佛山市南海鼎标精工机械有限公司 A kind of three-way pipe water swelling mould

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Application publication date: 20160113