CN113579136B - Pipe fitting processing equipment - Google Patents
Pipe fitting processing equipment Download PDFInfo
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- CN113579136B CN113579136B CN202110728703.6A CN202110728703A CN113579136B CN 113579136 B CN113579136 B CN 113579136B CN 202110728703 A CN202110728703 A CN 202110728703A CN 113579136 B CN113579136 B CN 113579136B
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- die
- oil cylinder
- pipe
- pipe fitting
- shaping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/14—Recontouring
Abstract
The invention relates to the field of pipe fitting machining, and discloses pipe fitting machining equipment which comprises an end part shaping die (1) located at a first station and an end part fine upsetting die (10) located at a second station, wherein the pipe fitting machining equipment can firstly carry out primary end part shaping on a pipe fitting through the end part shaping die (1), and then carry out fine upsetting on the end part of the pipe fitting through the end part fine upsetting die (10) so as to manufacture an end part fine ruler pipe fitting. Through above-mentioned technical scheme, only process the tip of pipe fitting through tip plastic mould and tip smart heading mould to make the pipe fitting that tip size is accurate, satisfy with the connection requirement of other pipe fittings or joints, need not do the smart chi processing to the part outside the tip, reduced manufacturing procedure and processing cost, improved machining efficiency.
Description
Technical Field
The invention relates to the field of pipe fitting machining, in particular to pipe fitting machining equipment.
Background
At present, the fine drawing seamless steel pipe in the market is applied to a hydraulic fluid connection process and has the following four forms: the metal sealing ferrule nut, the elastic sealing pipeline forming and the 37-degree flaring can only be matched with the finish drawing seamless steel pipe, and the price of the finish drawing seamless steel pipe is exponentially higher than that of the seamless steel pipe.
At present, a seamless tube blank is subjected to cold drawing for multiple times, and finally, a high-precision die is used for finish drawing to obtain a finish-drawn seamless tube. With the development of industry, the influence of material cost on product price is larger and larger, and the current process cannot meet the cost requirement in the industry.
Disclosure of Invention
The invention aims to provide pipe fitting machining equipment to solve the problem that machining cost of a precisely drawn seamless steel pipe is high.
In order to achieve the above object, an aspect of the present invention provides a pipe processing apparatus, wherein the pipe processing apparatus includes an end shaping die at a first station and an end fine upsetting die at a second station, and the pipe processing apparatus is capable of primarily shaping an end of a pipe by the end shaping die and then fine upsetting an end of the pipe by the end fine upsetting die to manufacture an end fine rule pipe.
Optionally, the pipe machining equipment comprises a die oil cylinder capable of driving the end shaping die and the end fine upsetting die to open and close synchronously.
Alternatively, the pipe can be inserted into the end shaping die and the end finish heading die, respectively, in a first direction, and the end shaping die and the end finish heading die are aligned in a second direction perpendicular to the first direction.
Optionally, the pipe machining equipment comprises clamps arranged at the first station and the second station, a clamp oil cylinder used for driving the clamps, and a feeding oil cylinder used for driving the pipe to move from the first station to the second station.
Optionally, the end shaping die comprises a die expanding mandrel, and the pipe machining device comprises a shaping oil cylinder driving the die expanding mandrel to move along the first direction.
Optionally, the end fine upsetting die comprises an upsetting die core rod, and the pipe machining device comprises a fine upsetting oil cylinder for driving the end fine upsetting die to move along the first direction.
Optionally, the pipe fitting processing equipment comprises a support frame for respectively supporting the end part shaping die and the end part fine upsetting die, and the die oil cylinder can drive the support frame to deform so as to respectively drive the end part shaping die and the end part fine upsetting die to open and close.
Optionally, the pipe fitting processing equipment comprises a hydraulic driving mechanism, and the hydraulic driving mechanism is provided with an oil tank, an oil pump, the die oil cylinder, the clamp oil cylinder, the feeding oil cylinder, the shaping oil cylinder and the fine upsetting oil cylinder.
Optionally, the feeding oil cylinder, the shaping oil cylinder and the fine upsetting oil cylinder are respectively connected to an oil inlet pipe and an oil return pipe through three first reversing valves.
Optionally, the mold cylinder and the clamp cylinder are connected in parallel to an oil inlet pipe and an oil return pipe through a second reversing valve, wherein a sequence valve is arranged on a pipeline of a rod cavity of the mold cylinder, and a sequence valve is arranged on a pipeline of a rodless cavity of the clamp cylinder; or a sequence valve is arranged on a rodless cavity pipeline of the mold oil cylinder, and a sequence valve is arranged on a rod cavity pipeline of the clamp oil cylinder.
Through above-mentioned technical scheme, only process the tip of pipe fitting through tip plastic mould and tip smart heading mould to make the pipe fitting that tip size is accurate, satisfy with the connection requirement of other pipe fittings or joints, need not do the smart chi processing to the part outside the tip, reduced manufacturing procedure and processing cost, improved machining efficiency.
Drawings
Fig. 1 is a schematic structural view of a pipe machining apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hydraulic circuit according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of an end shaping mold according to an embodiment of the present invention;
fig. 4 is a schematic structural view of an end fine upsetting die according to an embodiment of the invention.
Description of the reference numerals
1-end shaping die, 2-clamp, 3-support frame, 4-die oil cylinder, 5-clamp oil cylinder, 6-feeding oil cylinder, 7-shaping oil cylinder, 10-end fine upsetting die, 11-fine upsetting oil cylinder, 12-fine upsetting core rod, 13-die expanding core rod, 14-electromagnetic induction coil heating device, 30-pipe fitting, 61-oil tank, 62-oil pump, 63-motor, 64-overflow valve, 65-first reversing valve, 66-second reversing valve, 67-sequence valve and 68-hydraulic lock.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The precise ruler is used for machining a blank pipe fitting into a pipe fitting with precise size and small error, and the precise size machining is realized.
The invention provides a pipe fitting machining device which comprises an end part shaping die 1 located at a first station and an end part fine upsetting die 10 located at a second station, wherein the pipe fitting machining device can firstly perform primary end part shaping on a pipe fitting through the end part shaping die 1 and then perform fine upsetting on the end part of the pipe fitting through the end part fine upsetting die 10 to manufacture an end part fine ruler pipe fitting.
The pipe machining apparatus can perform end machining on a pipe, particularly for metal pipes such as steel pipes, and can perform drawing (e.g., cold drawing) on the pipe multiple times and blanking at the end before machining the pipe by using the pipe machining apparatus.
The existing application of the finish-drawn seamless steel pipe in carrying hydraulic fluid has high requirements on the size of the end of a raw material, but has no requirements on the size of the middle of a pipeline, and the finish-drawn seamless steel pipe is used in the whole process, so that the material waste is large and the processing time is long; the price of the fine drawing seamless steel tube is exponentially higher than that of the seamless steel tube, and the product cost is high.
The pipe fitting machining equipment comprises an end part shaping die 1 and an end part fine upsetting die 10, wherein the end part shaping die 1 can carry out primary shaping on the end part of the pipe fitting, so that the end part of the pipe fitting is preliminarily formed into a target shape (for example, shaped into a standard circle) and is closer to a target size; then, the end of the preliminarily shaped pipe fitting is subjected to finish rule machining (namely, precise dimension machining) through the end fine upsetting die 10, so that the dimension of the end is more precise and meets the target dimension, namely, the end of the pipe fitting is machined into the target dimension in a fine upsetting mode.
In this scheme, only process the tip of pipe fitting through tip plastic mould and tip smart heading mould to make the pipe fitting that tip size is accurate, satisfy with the connection requirement of other pipe fittings or joints, need not do smart chi processing to the part outside the tip, reduced manufacturing procedure and processing cost, improved machining efficiency.
In addition, the pipe fitting machining equipment comprises a die oil cylinder 4 which can drive the end shaping die 1 and the end fine upsetting die 10 to open and close. The end shaping die 1 and the end fine upsetting die 10 can open and close the dies in a specific direction respectively, the dies need to be closed before the end of the pipe is machined, and the dies need to be opened to draw out the pipe after the end of the pipe is machined. In the pipe fitting processing equipment of this scheme, the direction of opening and shutting of setting up tip plastic mould 1 and tip finish upsetting mould 10 to keep unanimous to can connect two moulds through the linkage, and drive two moulds through single mould hydro-cylinder 4 and open and shut in step, make the pipe fitting 30 of first station and second station can carry out the tip processing in step.
Wherein the pipe can be inserted into the end shaping die 1 and the end finish heading die 10 in a first direction, respectively, and the end shaping die 1 and the end finish heading die 10 are arranged in a second direction perpendicular to the first direction. Referring to fig. 1, the left-right direction is a first direction, and the up-down direction is a second direction. The pipe 30 extends in a first direction and is movable in the first direction relative to the end sizing die 1 and the end finish heading die 10 to insert or remove from the corresponding dies to effect machining of the ends of the pipe.
In addition, the pipe fitting machining equipment comprises a clamp 2 arranged at the first station and the second station, a clamp oil cylinder 5 used for driving the clamp 2, and a feeding oil cylinder 6 used for driving a pipe fitting to move from the first station to the second station. The first station and the second station can be respectively provided with a clamp 2 for clamping the pipe 30 positioned on the first station or the second station, and the clamp oil cylinder 5 can drive the clamp 2 to open and close so as to release and clamp the pipe 30. In some embodiments, the first and second stations of the gripper 2 and 2 may be connected by a linkage to open and close synchronously and driven by a single gripper cylinder 5; of course, the first station gripper 2 and the second station gripper 2 may be independent of each other and driven by different gripper cylinders 5. The feed cylinder 6 can drive the tube 30 from the first station to the second station in a direction corresponding to the second direction.
In addition, the end shaping die 1 includes a die expanding mandrel 13, and the pipe machining apparatus includes a shaping cylinder 7 that drives the end shaping die 1 to move in the first direction. As shown in fig. 3, the end shaping die 1 includes two openable and closable die halves and a die expanding mandrel 13 clamped between the die halves, and the die expanding mandrel 13 can be inserted into an end of the pipe 30 to expand an inner diameter thereof to a target size, and particularly, can form an inner circumferential surface of the pipe 30 into a circular shape. Wherein, the pipe fitting 30 clamped and fixed by the clamp 2 can be fixed at the first station, and the shaping oil cylinder 7 drives the die expanding mandrel 13 (or the whole end shaping die 1) to move towards the pipe fitting 30 so as to insert the die expanding mandrel 13 into the end of the pipe fitting to realize the primary shaping. The outer diameter of the die expanding mandrel 13 may be greater than the inner diameter of the end of the pipe to be swaged.
Wherein, tip finish-heading mould 10 includes heading die plug 12, the pipe fitting processing equipment is including the drive tip finish-heading mould 10 is followed the finish-heading hydro-cylinder 11 that first direction removed. As shown in fig. 4, the end fine upsetting die 10 comprises two openable half dies and an upsetting die core rod 12, the upsetting die core rod 12 is partially clamped between the two half dies and partially surrounded by the two half dies to form a fine upsetting cavity, and the fine upsetting oil cylinder 11 drives the end fine upsetting die 10 to move to allow the end of the pipe to be inserted into the fine upsetting cavity to realize fine upsetting.
In addition, the pipe fitting processing equipment comprises a support frame 3 which supports the end part shaping die 1 and the end part fine upsetting die 10 respectively, and the die oil cylinder 4 can drive the support frame 3 to deform so as to drive the end part shaping die 1 and the end part fine upsetting die 10 to open and close respectively. As shown in fig. 1, the supporting frame 3 includes an L-shaped connecting rod and a lever, one end of the connecting rod is connected to the lever, the other end of the connecting rod is connected to one half die, the other end of the lever is connected to the other half die, the connecting rod, the lever and the die enclose a quadrilateral, and at this time, the connecting rod, the lever and the die are in a die closing state, when the die cylinder 4 drives the connecting rod to move along the second direction, the lever and the connecting rod rotate around a fulcrum, and the two half dies are relatively far away from each other, so that the die opening is realized.
In addition, as shown in fig. 1, an electromagnetic induction coil heating device 14 is located in front of (or only in front of) the end shaping die 1 and the end finish heading die 10, and the pipe can be moved through the electromagnetic induction coil heating device 14 to electromagnetically induction heat the end of the pipe before the pipe 30 enters the dies.
Particularly, when the pipe enters the electromagnetic induction coil heating device 14, the induction coil is electrified, and after the pipe is heated for a preset time, the induction coil is powered off; wherein the current frequency is 3-5 KHZ. The heat time of pipe fitting is confirmed according to the wall thickness of pipe fitting, the unit of getting the wall thickness is the numerical value l of millimeter, the unit of heat time is the numerical value t of second, then t is 22.5l +37.5, can calculate the required heat time of pipe fitting of different wall thicknesses according to this formula of calculating, make the temperature after the pipe fitting heating be in comparatively stable scope, it is corresponding, the physical properties of pipe fitting is also comparatively stable, the difference of different pipe fittings is less, be convenient for process out the performance, the same accurate chi pipe fitting of technical index basic.
Wherein the electromagnetic induction coil heating device 14 comprises an electromagnetic induction coil into which the end of the pipe can be inserted to achieve induction heating; the electromagnetic induction coil is electrically connected with the time relay, and the time relay can be set to be disconnected after being communicated for fixed time, so that the electromagnetic induction coil is powered off after being powered on for fixed time, correspondingly, the pipe fitting can be heated and fixed for a long time, and the heating time of each pipe fitting is guaranteed to be the same.
The wall thickness of the pipe fitting is 1-5mm, and correspondingly, the heating time is 60-150 s.
In addition, the pipe fitting processing equipment comprises a hydraulic driving mechanism, wherein the hydraulic driving mechanism is provided with an oil tank 61, an oil pump 62, the die oil cylinder 4, the clamp oil cylinder 5, the feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11. As shown in fig. 2, the die cylinder 4, the clamp cylinder 5, the feeding cylinder 6, the shaping cylinder 7 and the fine upsetting cylinder 11 are arranged in the same hydraulic pipeline and are hydraulically driven by the same oil pump 62, and the oil pump 62 is in transmission connection with a motor 63 and is driven by the motor 63 to operate. The oil inlet pipe of the oil pump 62 is provided with a one-way valve, and is connected with an overflow pipe, and an overflow valve 64 is arranged on the overflow pipe.
The feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11 are respectively connected with an oil inlet pipe and an oil return pipe through three first reversing valves 65. The feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11 are connected in parallel and are mutually independent, a pipeline where each oil cylinder is located is provided with a first reversing valve 65, and the first reversing valves 65 realize the cutting, communication and reversing of the pipelines so as to control the extension and retraction of the corresponding oil cylinders. When the pipe fitting processing equipment runs, the feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11 can be respectively and independently controlled.
And hydraulic locks 68 are arranged on pipelines of the feeding oil cylinder 6, the shaping oil cylinder 7 and the fine upsetting oil cylinder 11 respectively. The hydraulic lock 68 is arranged on the oil inlet pipe and the oil return pipe, and can disconnect or connect pipelines, so that the safety is improved.
In addition, the mold cylinder 4 and the clamp cylinder 5 are connected in parallel to an oil inlet pipe and an oil return pipe through a second reversing valve 66, wherein a sequence valve 67 is arranged on a pipeline of a cavity with a rod of the mold cylinder 4, and a sequence valve 67 is arranged on a pipeline without a rod of the clamp cylinder 5; or a sequence valve 67 is arranged on the rodless cavity pipeline of the mold oil cylinder 4, and a sequence valve 67 is arranged on the rod cavity pipeline of the clamp oil cylinder 5. The mold cylinder 4 and the clamp cylinder 5 are connected in parallel with each other, and the rodless cavity of the mold cylinder 4 communicates with the rodless cavity of the clamp cylinder 5, and the rod cavity of the mold cylinder 4 communicates with the rod cavity of the clamp cylinder 5.
In one embodiment, a sequence valve 67 is arranged on the rodless cavity pipeline of the mold cylinder 4, a sequence valve 67 is arranged on the rod cavity pipeline of the clamp cylinder 5, when the second reversing valve 66 enables the oil inlet pipe to be communicated with the rod cavity pipeline of the mold cylinder 4 and the rod cavity pipeline of the clamp cylinder 5, the mold cylinder 4 extends out, the clamp cylinder 5 is kept static, when the mold cylinder 4 extends completely, the sequence valve 67 on the rod cavity pipeline of the clamp cylinder 5 starts to be communicated under higher oil pressure, and the clamp cylinder 5 starts to extend; when the second direction change valve 66 causes the oil feed pipe to communicate with the rodless chamber line of the mold cylinder 4 and the rodless chamber line of the jig cylinder 5, the jig cylinder 5 starts to retract while the mold cylinder 4 remains stationary, and when the jig cylinder 5 is completely retracted, the sequence valve 67 on the rod chamber line of the mold cylinder 4 starts to communicate at a greater oil pressure. In this embodiment, the mold cylinder 4 extends out of the clamp cylinder 5 and then extends out, and the clamp cylinder 5 retracts back after retracting the mold cylinder 4, so that the mold is closed first and then the pipe 2 is clamped by the clamp 2, and then the clamp 2 releases the pipe mold and opens the mold.
In another embodiment, the pipe line of the rod cavity of the mold cylinder 4 is provided with a sequence valve 67, and the pipe line of the rodless cavity of the clamp cylinder 5 is provided with a sequence valve 67, which is the same as the principle of the above embodiment, and the mold and the clamp can be opened and closed according to a specific sequence, which will not be repeated herein.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the specific features in any suitable way, and the invention will not be further described in relation to the various possible combinations in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (1)
1. A pipe machining device is characterized by comprising an end shaping die (1) located at a first station and an end fine upsetting die (10) located at a second station, wherein the pipe machining device can firstly perform primary end shaping on a pipe through the end shaping die (1) and then perform fine upsetting on the end of the pipe through the end fine upsetting die (10) to manufacture an end fine pipe;
the pipe fitting machining equipment comprises a die oil cylinder (4) capable of driving the end shaping die (1) and the end fine upsetting die (10) to open and close synchronously;
the pipe fitting is insertable into the end shaping die (1) and the end finish heading die (10) in a first direction, respectively, and the end shaping die (1) and the end finish heading die (10) are aligned in a second direction perpendicular to the first direction;
the pipe fitting machining equipment comprises a clamp (2) arranged at the first station and the second station, a clamp oil cylinder (5) used for driving the clamp (2), and a feeding oil cylinder (6) used for driving a pipe fitting to move from the first station to the second station;
the end shaping die (1) comprises a die expanding mandrel (13), and the pipe fitting machining equipment comprises a shaping oil cylinder (7) for driving the die expanding mandrel (13) to move along the first direction;
the end part fine upsetting die (10) comprises an upsetting die core rod (12), and the pipe fitting machining equipment comprises a fine upsetting oil cylinder (11) for driving the end part fine upsetting die (10) to move along the first direction;
the pipe fitting machining equipment comprises a support frame (3) which supports the end part shaping die (1) and the end part fine upsetting die (10) respectively, and the die oil cylinder (4) can drive the support frame (3) to deform so as to drive the end part shaping die (1) and the end part fine upsetting die (10) to open and close respectively;
the pipe fitting machining equipment comprises a hydraulic driving mechanism, and the hydraulic driving mechanism is provided with an oil tank (61), an oil pump (62), the die oil cylinder (4), the clamp oil cylinder (5), the feeding oil cylinder (6), the shaping oil cylinder (7) and the fine upsetting oil cylinder (11);
the feeding oil cylinder (6), the shaping oil cylinder (7) and the fine upsetting oil cylinder (11) are respectively connected with an oil inlet pipe and an oil return pipe through three first reversing valves (65);
the mould oil cylinder (4) and the clamp oil cylinder (5) are connected in parallel with an oil inlet pipe and an oil return pipe through a second reversing valve (66), wherein,
a sequence valve (67) is arranged on a pipeline with a rod cavity of the mold oil cylinder (4), and a sequence valve (67) is arranged on a pipeline without the rod cavity of the clamp oil cylinder (5); or
A sequence valve (67) is arranged on a rodless cavity pipeline of the mold oil cylinder (4), and a sequence valve (67) is arranged on a rod cavity pipeline of the clamp oil cylinder (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728703.6A CN113579136B (en) | 2021-06-29 | 2021-06-29 | Pipe fitting processing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728703.6A CN113579136B (en) | 2021-06-29 | 2021-06-29 | Pipe fitting processing equipment |
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| Publication Number | Publication Date |
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| CN113579136A CN113579136A (en) | 2021-11-02 |
| CN113579136B true CN113579136B (en) | 2022-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110728703.6A Active CN113579136B (en) | 2021-06-29 | 2021-06-29 | Pipe fitting processing equipment |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60211204A (en) * | 1984-02-27 | 1985-10-23 | ウエスチングハウス エレクトリック コ−ポレ−ション | Remotely controlled pipe expander and sleeping method |
| CN200960539Y (en) * | 2006-10-27 | 2007-10-17 | 张海勇 | Pipe-expanding mechanism |
| CN101468364A (en) * | 2007-12-29 | 2009-07-01 | 付朋 | Thermal expansion machine for producing stainless steel tube |
| CN202037265U (en) * | 2011-03-10 | 2011-11-16 | 广州粤研液压机电有限公司 | Pipe expander |
| KR20140055597A (en) * | 2012-10-31 | 2014-05-09 | 이종태 | Coupling pipe forming apparatus and the method thereof |
| CN104985043A (en) * | 2015-01-30 | 2015-10-21 | 西北工业大学 | Electromagnetic induction heating bulging apparatus and shaping method for metal conductor pipe |
| CN206643235U (en) * | 2017-03-01 | 2017-11-17 | 上海成美塑料制品有限公司 | Double pier head machine |
-
2021
- 2021-06-29 CN CN202110728703.6A patent/CN113579136B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60211204A (en) * | 1984-02-27 | 1985-10-23 | ウエスチングハウス エレクトリック コ−ポレ−ション | Remotely controlled pipe expander and sleeping method |
| CN200960539Y (en) * | 2006-10-27 | 2007-10-17 | 张海勇 | Pipe-expanding mechanism |
| CN101468364A (en) * | 2007-12-29 | 2009-07-01 | 付朋 | Thermal expansion machine for producing stainless steel tube |
| CN202037265U (en) * | 2011-03-10 | 2011-11-16 | 广州粤研液压机电有限公司 | Pipe expander |
| KR20140055597A (en) * | 2012-10-31 | 2014-05-09 | 이종태 | Coupling pipe forming apparatus and the method thereof |
| CN104985043A (en) * | 2015-01-30 | 2015-10-21 | 西北工业大学 | Electromagnetic induction heating bulging apparatus and shaping method for metal conductor pipe |
| CN206643235U (en) * | 2017-03-01 | 2017-11-17 | 上海成美塑料制品有限公司 | Double pier head machine |
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| CN113579136A (en) | 2021-11-02 |
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