CN111496059A - Hydraulic forming process for locking pipe fitting or profile by flexible cross beam type oil cylinder - Google Patents
Hydraulic forming process for locking pipe fitting or profile by flexible cross beam type oil cylinder Download PDFInfo
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- CN111496059A CN111496059A CN201910032931.2A CN201910032931A CN111496059A CN 111496059 A CN111496059 A CN 111496059A CN 201910032931 A CN201910032931 A CN 201910032931A CN 111496059 A CN111496059 A CN 111496059A
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- die
- cylinder
- pipe fitting
- hydraulic
- oil cylinder
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- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/039—Means for controlling the clamping or opening of the moulds
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/045—Closing or sealing means
-
- 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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
Abstract
The invention provides a hydraulic forming process for a flexible cross beam type oil cylinder locking pipe fitting or a section, which comprises the following process flows of: the upper die and the equipment beam are driven by the lifting hydraulic cylinder to rapidly descend, and the beam reaches a bottom dead center; the die assembly locking pin is driven by a cylinder, an oil cylinder or a motor to lock the upper dead point of the upward floating beam; the force application oil cylinder extends by taking the cross beam as a base and contacts with the bottom surface of the upper die to complete forming, water injection and die assembly; after the die is closed to the end, the internal pressurization system works under the coordination of the action of the die, and the hydraulic bulging of the workpiece is completed by the equipment beam and the movable workbench together; after the internal pressurization system and the force application oil cylinder of the hydraulic station release pressure, the die closing locking pin exits from the working position; the equipment beam and the upper die move upwards quickly to complete the hydraulic forming of the pipe fitting or the section. The invention provides the locking force of the pipe fitting or section hydraulic forming die through the force application oil cylinder, thereby realizing the light weight of the hydraulic forming equipment and the die, having lower cost and higher efficiency and ensuring the product quality.
Description
Technical Field
The invention mainly relates to the technical field of hydraulic forming, in particular to a hydraulic forming process for a flexible cross beam type oil cylinder locking pipe fitting or sectional material.
Background
The hydroforming technology is also called internal high pressure forming technology, and depends on that fluid medium (such as water) generates huge pressure under the action of high pressure to serve as a male die (or a female die) of a die, so that the plate, the pipe fitting or the profile is attached to the female die (or the male die), and a workpiece is subjected to plastic forming to obtain a component with a required shape. The hydraulic forming is adopted, the workpiece is formed under the action of hydrostatic pressure stress, the forming property is good, deep drawing bulging can be carried out, the stress of a component is the pressure stress, the rebound quantity is small, the forming size is accurate and stable, and the forming technology is an important forming technology for realizing the forming of complex workpieces.
However, the main body of the hydraulic forming equipment is a large-tonnage hydraulic press, the liquid bulging pressure is usually 150-. By combining the factors, the hydraulic forming press has the requirements of good rigidity, long stroke, large tonnage and very large investment, and is a main source of the hydraulic forming production cost of large-scale components.
The published Chinese invention patent, application number CN200710019709.6, patent name: an internal high pressure forming method of a tubular part with a special-shaped section is disclosed in the application date: 20070206, the invention relates to and discloses an internal high pressure forming method of a tubular part with a special-shaped section, which comprises the following steps: firstly, placing a metal pipe blank in a mould, and forming a sealed cavity by a pressure head, a mould cavity and a pipe cavity of the blank after mould assembly; filling the sealed cavity with a liquid medium; the two pressure heads extrude inwards, simultaneously high-pressure liquid medium is injected into the tube blank, and the metal tube blank generates plastic deformation under the combined action of liquid pressure and axial feeding thrust and is finally attached to the inner wall of the die cavity; pressure is removed after the pressure is maintained for a certain time; and (5) obtaining the required tubular part with the special-shaped section after die parting. Compared with the traditional stamping and welding process, the process can reduce the weight of parts and save materials; the strength and the rigidity of the part are improved; the number of parts is reduced, and the cost of the die is saved; the production flow is simplified, and the production efficiency and the product quality are improved; improve the gas flow characteristic in the pipe fitting or the section bar, the structural shape design is more flexible and optimized.
Disclosure of Invention
The invention provides a hydraulic forming process for a flexible crossbeam type oil cylinder locking pipe fitting or a section bar, aiming at the defects in the prior art, the invention provides the hydraulic forming process for the flexible crossbeam type oil cylinder locking pipe fitting or the section bar, which comprises the following process steps:
s1: the upper die 8 and the equipment beam 2 are driven by the lifting hydraulic cylinder 6 to rapidly move downwards, and the beam 2 reaches a bottom dead center; the die assembly locking pin 3 locks the upper dead point of the upward floating of the beam 2 under the driving of a cylinder, an oil cylinder or a motor;
s2: the force application oil cylinder 1 extends by taking the cross beam 2 as a base under the matching of a mold and a rapid water injection system, contacts the bottom surface of the upper mold 8, applies force to drive the upper mold 8 to overcome the forming resistance of a workpiece, and completes forming, water injection and mold assembly;
s3: after the die is closed to the end, the inner pressurization system works under the coordination of the action of the die, and the equipment beam 2 and the movable workbench 7 provide die locking force to jointly complete hydraulic bulging of a workpiece;
s4: after the internal pressurization system and the force application oil cylinder are decompressed, the mold closing locking pin 3 is withdrawn from the working position;
s5: and the lifting hydraulic cylinder 6, the cylinder or the motor drives the equipment beam 2 and the upper die 8 to rapidly move upwards, the die is opened to take away the workpiece, and the hydraulic forming of the pipe fitting or the section 11 is completed.
Preferably, in step S1, there is a gap of 0 to 150mm from the bottom surface of the upper mold 8 depending on the preset gap between the beam 2 and the mold.
Preferably, in step S2, the upward movement range of mold clamping beam 2 is 1-150 mm.
Preferably, in step S2, the working stroke of the force application cylinder is 0-150mm and is greater than the upward movement distance of the mold clamping beam 2, and the force provided by the force application cylinder is 800-.
Preferably, in step S2, after the rapid water injection system is started, the air inside the pipe or the section bar 11 is exhausted along with the pre-forming and mold-closing processes.
Preferably, in steps S2 and S3, in cooperation with the rapid water injection, the hydraulic system connected to the axial cylinder 4 is activated and the sealing head is moved axially along the tube or section 11, sealing the two ends of the tube or section 11.
Preferably, in step S3, near the end of the hydraulic bulging, the punching energy storage system is activated, and the punching cylinder 10 is moved to complete the punching of the pipe or the section bar 11.
Preferably, in step S3, the lower deflection of the cross beam 2 when fully loaded is 1/1000-1/8000.
Preferably, in step S3, the force application cylinders 1 are horizontally arranged in several rows, and the load formed by the force application cylinders 1 is uniformly distributed on the entire table surface of the cross beam 2.
Preferably, in the steps S1 and S5, the lifting hydraulic cylinder 6, the cylinder or the motor drives the upper mold 8 to move, the moving speed of the mold opening and closing is 0-1200m/S, and the stroke is 400-1800 mm.
The invention has the beneficial effects that: the locking force required by the hydroforming is provided by the locking of the oil cylinder. The hydraulic forming of complex workpieces, particularly large-sized pipe fittings or profiles, can be realized, the tonnage of a press required by the hydraulic forming is reduced, and the lightweight design of the die is realized. Meanwhile, the investment cost of equipment and a die is lower, the production beat is faster, and the product quality is also ensured.
Drawings
FIG. 1 is a block diagram of a hydraulic station apparatus and mold suitable for use in the present invention;
in the figure, the position of the upper end of the main shaft,
1. a force application oil cylinder; 2. a cross beam; 3. a mold closing locking pin; 4. an axial cylinder; 5. a mold clamping device; 6. a lifting hydraulic cylinder; 7. moving the working table; 8. an upper die; 9. a lower die; 10. punching an oil cylinder; 11. a pipe or a profile.
Detailed Description
As shown in fig. 1, the present invention comprises the following process flow:
s1: the upper die 8 and the cross beam 2 of the equipment are driven by the lifting hydraulic cylinder 6 to rapidly descend, and the cross beam 2 reaches a bottom dead center; the die assembly locking pin 3 locks the upper dead point of the upward floating of the beam 2 under the driving of a cylinder, an oil cylinder or a motor;
s2: the force application oil cylinder 1 extends by taking the cross beam 2 as a base under the matching of a mold and a rapid water injection system, contacts the bottom surface of the upper mold 8, applies force to drive the upper mold 8 to overcome the forming resistance of a workpiece, and completes forming, water injection and mold assembly;
s3: after the die is closed to the end, the inner pressurization system works under the coordination of the action of the die, and the equipment beam 2 and the movable workbench 7 provide die locking force to jointly complete hydraulic bulging of a workpiece;
s4: after the pressure of the internal pressurization system and the force application oil cylinder 1 of the hydraulic station is relieved, the die closing locking pin 3 is withdrawn from the working position;
s5: and the lifting hydraulic cylinder 6, the cylinder or the motor drives the equipment beam 2 and the upper die 8 to rapidly move upwards, the die is opened to take away the workpiece, and the hydraulic forming of the pipe fitting or the section 11 is completed.
In the present embodiment, it is preferable that in step S1, the beam 2 has a gap of 0 to 150mm from the bottom surface of the upper mold 8 in the mold-opened state, depending on the difference between the beam 2 and the mold gap set in advance.
The process is realized by means of the die clamper 5, and the die assembly locking pin 3 can smoothly reach the upper dead point of the upward floating of the beam 2 without interference; meanwhile, the pre-forming of the pipe fitting or the section bar 11 with a certain shape is completed by utilizing the ejection function of the force application oil cylinder 1.
In this embodiment, it is preferable that the range of upward movement of the mold clamping beam 2 in step S2 be 0 to 150 mm.
By the aid of the process, under the action of the force application oil cylinder 1, early-stage plastic forming of the workpiece and die assembly of the die are completed until the cross beam 2 is attached to the die locking cross pin, and then locking force is provided for hydraulic forming of the pipe fitting or the sectional material.
In the present embodiment, preferably, in step S2, the working stroke of the force application cylinder 1 is 0-150mm, and is greater than the upward movement distance of the mold clamping beam 2, and the force that can be provided is 800-.
By adopting the process, the working stroke of the force application oil cylinder 1 is greater than the upward moving distance of the mold locking cross beam 2, and the force application oil cylinder 1 effectively applies pressure to the bottom surface of the upper mold 8 by taking the cross beam 2 as a base. The amount and time of the applied pressure can be controlled by the hydraulic system.
In this embodiment, it is preferable that in the step S2, after the rapid water injection system is started, the air inside the pipe or the section bar 11 is exhausted along with the pre-forming and mold-closing processes.
By the aid of the process, in the pipe fitting or sectional material pre-forming and die assembling process, the rapid water injection system is started to exhaust air in the pipe fitting or sectional material 11, the water injection process is completed, and production takt is improved.
In this embodiment, preferably, in steps S2 and S3, in conjunction with the rapid water injection process, the hydraulic control system connected to the axial cylinder 4 is activated and the sealing head is moved axially along the tube or profile 11 to seal the ends of the tube or profile 11.
By adopting the process, in the die closing process, the axial cylinder 4 moves along the axial direction of the pipe fitting or the section bar 11 in a matched manner to realize rapid water injection action, so that the two ends of the pipe fitting or the section bar 11 are sealed, and the production takt is greatly improved.
In the present embodiment, preferably, in step S3, near the end of the hydraulic bulging, the punching energy storage system is activated, and the punching cylinder 10 is moved to complete the punching of the pipe or the profile 11.
In the present embodiment, preferably, in S3, the lower deflection of the cross beam 2 when fully loaded is 1/1000-1/8000 under the action of the force application cylinder 1.
By adopting the process, the deformation of the cross beam 2 is ensured to be within the elastic deformation range under the action of the force application oil cylinder 1, so that the service life of the equipment is prolonged; simultaneously, compare ordinary press formula mode locking, it is lower to the rigidity requirement of hydraulic pressure station equipment and mould, is favorable to realizing the lightweight of hydraulic pressure station.
In the present embodiment, preferably, in step S3, the force application cylinders 1 are horizontally arranged in several rows, and the load formed by the force application cylinders 1 is uniformly distributed on the entire table surface of the cross beam 2.
By adopting the process, the mold locking force is directly applied to the mold, and even if the ejection force of the force application oil cylinder 1 is larger, the mold locking force applied to the mold cannot be influenced by the deformation of the cross beam 2 within the elastic range.
Preferably, in the steps S1 and S5, the lifting hydraulic cylinder 6, the cylinder or the motor drives the upper mold 8 to move, the moving speed of the mold opening and closing is 0-1200m/S, and the stroke is 400-1800 mm;
by adopting the process, the lifting hydraulic cylinder 6 does not provide the mold locking force, the opening and closing speed of the mold can reach 0-1200m/s, the stroke is 400-1800mm, the production takt is greatly improved, and the application range of the hydraulic station is expanded.
The above-described embodiments are merely illustrative of the principles and utilities of the present patent application and are not intended to limit the present patent application. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of this patent application. Therefore, it is intended that all modifications and variations which may occur to those skilled in the art without departing from the spirit and scope of the disclosure herein be covered by the appended claims.
Claims (10)
1. A hydraulic forming process for a flexible cross beam type oil cylinder locking pipe fitting or a section is characterized by comprising the following process flows of:
s1: the upper die (8) and the equipment beam (2) are driven by the lifting hydraulic cylinder (6) to rapidly move downwards, and the beam (2) reaches a bottom dead center; the die assembly locking pin (3) is driven by a cylinder, an oil cylinder or a motor to lock the upper dead point of the upward floating of the beam (2);
s2: the force application oil cylinder (1) extends by taking the cross beam (2) as a base under the matching of the die and the rapid water injection system, contacts the bottom surface of the upper die (8), applies force to drive the upper die (8) to overcome the forming resistance of a workpiece, and completes forming, water injection and die assembly;
s3: after the die is closed to the bottom, the inner pressurization system works under the coordination of the action of the die, and the equipment beam (2) and the movable workbench (7) provide die locking force to jointly complete the hydraulic bulging of the workpiece;
s4: after the pressure of the internal pressurization system and the force application oil cylinder (1) of the hydraulic station is relieved, the die assembly locking pin (3) is withdrawn from the working position;
s5: and the lifting hydraulic cylinder (6), the cylinder or the motor drives the equipment beam (2) and the upper die (8) to rapidly move upwards, the die is opened to take away the workpiece, and the hydraulic forming of the pipe fitting or the section bar (11) is completed.
2. The flexible beam cylinder locking pipe fitting or profile hydroforming process according to claim 1, characterized in that: in the step S1, a gap of 0-150mm is reserved from the bottom surface of the upper die (8) according to the difference of the preset gaps between the beam (2) and the die.
3. The flexible beam cylinder locking pipe fitting or profile hydroforming process according to claim 1, characterized in that: in the step S2, the upward movement range of the mold clamping beam (2) is 1-150 mm.
4. The flexible beam cylinder locking pipe fitting or profile hydroforming process according to claim 3, characterized in that: in the step S2, the working stroke of the force application cylinder (1) is 0-150mm and is greater than the upward movement distance of the mold locking beam (2), and the force can be provided by 800-.
5. The flexible beam cylinder locking pipe fitting or profile hydroforming process according to claim 1, characterized in that: in the step S2, after the rapid water injection system is started, the air inside the pipe or the section (11) is exhausted along with the pre-forming and mold-closing processes.
6. The flexible beam cylinder locking pipe fitting or profile hydroforming process according to claim 1, characterized in that: in the steps S2 and S3, the hydraulic system connected with the axial cylinder (4) is started in cooperation with the rapid water injection, and the sealing head moves axially along the pipe or the section bar (11) to seal the two ends of the pipe or the section bar (11).
7. The flexible beam cylinder locking pipe fitting or profile hydroforming process according to claim 1, characterized in that: in the step S3, when the hydraulic bulging is close to the end, the punching energy storage system is started, and the punching oil cylinder (10) moves to complete punching on the pipe fitting or the section bar (11).
8. The flexible beam cylinder locking pipe fitting or profile hydroforming process according to claim 1, characterized in that: in the step S3, the lower deflection of the cross beam (2) when being fully loaded is 1/1000-1/8000.
9. The flexible beam cylinder locking pipe fitting or profile hydroforming process according to claim 8, wherein: in the step S3, the force application oil cylinders (1) are horizontally arranged in rows, and the load formed by the force application oil cylinders (1) is uniformly distributed on the table surface of the whole cross beam (2).
10. The flexible beam cylinder locking pipe fitting or profile hydroforming process according to claim 1, characterized in that: in the steps S1 and S5, the lifting hydraulic cylinder (6), the air cylinder or the motor drives the upper die (8) to move, the moving speed of the opening and closing of the die is 0-1200m/S, and the stroke is 400-1800 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910032931.2A CN111496059A (en) | 2019-01-14 | 2019-01-14 | Hydraulic forming process for locking pipe fitting or profile by flexible cross beam type oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910032931.2A CN111496059A (en) | 2019-01-14 | 2019-01-14 | Hydraulic forming process for locking pipe fitting or profile by flexible cross beam type oil cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN111496059A true CN111496059A (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910032931.2A Withdrawn CN111496059A (en) | 2019-01-14 | 2019-01-14 | Hydraulic forming process for locking pipe fitting or profile by flexible cross beam type oil cylinder |
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| Country | Link |
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| CN (1) | CN111496059A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1544243A (en) * | 2003-11-20 | 2004-11-10 | 哈尔滨工业大学 | Inside high pressure forming machine with an inhead type short runs mode locking oil cylinder |
| CN101454093A (en) * | 2006-02-15 | 2009-06-10 | 西德科汽车座椅技术有限责任公司 | Method and device for producing a cutout or aperture in the wall of a component formed according to the hydroforming process |
| CN102172704A (en) * | 2011-01-21 | 2011-09-07 | 西安交通大学 | Large-tonnage pipe internal high-pressure forming device |
| CN104338818A (en) * | 2013-08-01 | 2015-02-11 | 浙江摩多巴克斯汽配有限公司 | Internal high pressure forming equipment |
| CN107052126A (en) * | 2017-04-17 | 2017-08-18 | 无锡朗贤汽车组件研发中心有限公司 | Fittings hydraulic formation equipment |
-
2019
- 2019-01-14 CN CN201910032931.2A patent/CN111496059A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1544243A (en) * | 2003-11-20 | 2004-11-10 | 哈尔滨工业大学 | Inside high pressure forming machine with an inhead type short runs mode locking oil cylinder |
| CN101454093A (en) * | 2006-02-15 | 2009-06-10 | 西德科汽车座椅技术有限责任公司 | Method and device for producing a cutout or aperture in the wall of a component formed according to the hydroforming process |
| CN102172704A (en) * | 2011-01-21 | 2011-09-07 | 西安交通大学 | Large-tonnage pipe internal high-pressure forming device |
| CN104338818A (en) * | 2013-08-01 | 2015-02-11 | 浙江摩多巴克斯汽配有限公司 | Internal high pressure forming equipment |
| CN107052126A (en) * | 2017-04-17 | 2017-08-18 | 无锡朗贤汽车组件研发中心有限公司 | Fittings hydraulic formation equipment |
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Application publication date: 20200807 |
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