CN114192603A - Method for controlling interlayer redundancy and eliminating interlayer gap of multilayer metal corrugated pipe - Google Patents
Method for controlling interlayer redundancy and eliminating interlayer gap of multilayer metal corrugated pipe Download PDFInfo
- Publication number
- CN114192603A CN114192603A CN202111530217.XA CN202111530217A CN114192603A CN 114192603 A CN114192603 A CN 114192603A CN 202111530217 A CN202111530217 A CN 202111530217A CN 114192603 A CN114192603 A CN 114192603A
- Authority
- CN
- China
- Prior art keywords
- corrugated pipe
- interlayer
- pipe
- eliminating
- blank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 66
- 239000011229 interlayer Substances 0.000 title claims abstract description 38
- 239000002184 metal Substances 0.000 title claims abstract description 17
- 239000010410 layer Substances 0.000 claims abstract description 41
- 238000003466 welding Methods 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 239000002356 single layer Substances 0.000 claims abstract description 13
- 238000003754 machining Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/124—Making tubes or metal hoses with helically arranged seams the tubes having a special shape, e.g. with corrugated wall, flexible tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The embodiment of the invention provides a method for controlling surplus objects among layers of a multilayer metal corrugated pipe and eliminating interlayer gaps, which is characterized by comprising the following steps: manufacturing a plurality of single-layer tube blanks with different diameters; combining a plurality of the single-layer tube blanks into a multi-layer tube blank; respectively roll-welding and sealing two ends of the multilayer tube blank; assembling a multi-layer pipe blank with a corrugated pipe forming die, wherein the corrugated pipe forming die is provided with a process wave forming structure and is arranged outside straight pipe sections at two ends of the corrugated pipe, and a gap is formed between the corrugated pipe forming die and the pipe blank to perform integral hydraulic bulging or successive single-wave hydraulic bulging of the corrugated pipe; performing secondary roll welding at positions needing to be cut at two ends of the corrugated pipe on the inner side of the process wave; and machining and removing allowance at the secondary roll welding position. The method controls the interlayer clearance and the excess of the multilayer metal corrugated pipe, ensures the mechanical property and the fatigue life of the corrugated pipe, and solves the problem of preventing the excess from entering while discharging the air between the layers of the pipe blank in the forming process.
Description
Technical Field
The invention belongs to the technical field of machine manufacturing, and relates to a method for controlling surplus materials among layers of a multilayer metal corrugated pipe and eliminating a gap between the layers.
Background
The multilayer corrugated pipe product is widely applied to high-reliability occasions such as aviation and aerospace, and the use of the multilayer corrugated pipe often involves severe working conditions such as high pressure, high and low temperature change and the like, so that high requirements on the performance and the fatigue life of the corrugated pipe are provided, and meanwhile, high requirements on control of redundancy among layers of the multilayer corrugated pipe are provided. The large gaps exist among the layers of the corrugated pipes, so that the multilayer corrugated pipes can generate a layering phenomenon in the working process, and the pressure bearing capacity and the fatigue life of the corrugated pipes are reduced; the liquid and particle in the bellows layer is remained, because the liquid in the bellows layer is solidified or evaporated in the high and low temperature changing process, the pressure bearing capacity and fatigue life of the bellows can be obviously reduced along with the fatigue process, and the product quality is greatly influenced. Therefore, the interlayer clearance is reduced or eliminated while the surplus among corrugated pipe layers is controlled, and the method plays an important role in controlling the quality of high-performance corrugated pipe products.
In the conventional process of forming the multilayer corrugated pipe, interlayer excess is not controlled generally, air between pipe blank layers is naturally discharged from the port of the pipe blank when the corrugated pipe is formed, but forming media such as water, oil and the like also enter the pipe blank layers. In the occasions with high reliability requirements such as aerospace and the like, the method needs to prevent and control the excess from entering the tube blank layers by means of blocking the tube openings and the like, and needs to control the gaps among the layers of the multi-layer corrugated tubes and discharge the air among the layers, so that the method is difficult to realize in the conventional production operation or the realization process is complicated. Patent document CN105458058B (application No. 201410459818.X) discloses a method for reducing or eliminating the interlayer gap of a multilayer corrugated pipe, in which a die is sleeved outside a pipe blank, and the multilayer pipe blank is subjected to bulging and die-attaching by using an electromagnetic forming method, but the content of the excess control is not involved, and other patents aiming at the excess control of the corrugated pipe are not searched.
Disclosure of Invention
The invention provides a method for controlling the interlayer surplus of a multilayer metal corrugated pipe and eliminating an interlayer gap, which is used for improving the mechanical property of the corrugated pipe and ensuring the product quality.
The technical scheme of the invention is a method for controlling the excess among the layers of the multilayer metal corrugated pipe and eliminating the interlayer gap, in the occasions with high reliability requirements such as aerospace and the like, the excess is required to be prevented and controlled from entering the interlayer of the pipe blank by means of pipe orifice blocking and the like, the interlayer gap of the multilayer corrugated pipe is required to be controlled and interlayer air is discharged, and the method is difficult to realize in the conventional production operation. The invention can prevent and control the excess in the production process of the multilayer corrugated pipe from entering the pipe blank layers, can discharge air between the product layers to joint the multilayer pipe blanks, integrates a plurality of processes of preventing and controlling the excess and eliminating the interlayer clearance into the forming process of the corrugated pipe, ensures the product quality and enables the production process to be efficient and convenient. The method specifically comprises the following steps:
step 1: manufacturing a plurality of single-layer tube blanks with different diameters;
step 2: sleeving a plurality of single-layer tube blanks to form a multi-layer tube blank;
and step 3: performing sealing seam welding on two ends of the multilayer tube blank respectively;
and 4, step 4: assembling a multi-layer tube blank with a corrugated tube forming die, wherein the die is provided with a process wave structure, a certain gap is arranged between the die and the tube blank, and then performing hydraulic forming on the corrugated tube;
and 5: performing secondary roll welding at positions (located at the inner sides of the two process waves) to be cut at the two ends of the corrugated pipe;
step 6: and machining and removing allowance at the secondary roll welding position.
Preferably, the unilateral clearance of the multiple single-layer tube blank sets in the steps 1 and 2 is generally not more than 0.5 times of the wall thickness of the material.
Preferably, the excess on the inner surface and the outer surface of each layer of the tube blank is removed completely before the multiple layers of the tube blanks are sleeved in the step 2.
Preferably, the process wave structure of the mold in step 4 is formed at two ends of the outer side of the corrugated pipe respectively.
Preferably, the unilateral clearance between the die and the tube blank in the step 4 is not more than 2 times of the wall thickness of the material, and the amount of thinning of the forming is calculated to meet the design requirement.
Preferably, the corrugated pipe hydroforming in the step 4 can adopt an integral hydraulic bulging or a single-wave hydraulic successive bulging mode.
Preferably, the bellows with smaller size and smaller forming pressure adopts integral hydraulic bulging; aiming at the corrugated pipe with larger size and larger required forming pressure, a single-wave successive bulging mode is adopted to reduce the pressure bearing requirement of equipment, and when the single-wave successive bulging is carried out, a water injection head is adopted to move from the center to the left end and the right end in sequence to carry out bulging, so that interlayer gas is pressed to process waves at the two ends.
Preferably, the machining allowance removal in the step 6 can be selected from turning, wire cutting and the like.
The technical scheme of the invention is a method for controlling the excess among the layers of the multilayer metal corrugated pipe and eliminating the interlayer gap, in the occasions with high reliability requirements such as aerospace and the like, the excess is required to be prevented and controlled from entering the interlayer of the pipe blank by means of pipe orifice blocking and the like, the interlayer gap of the multilayer corrugated pipe is required to be controlled and interlayer air is discharged, and the method is difficult to realize in the conventional production operation. The invention can prevent and control the excess in the production process of the multilayer corrugated pipe from entering the pipe blank layers, can discharge air between the product layers to joint the multilayer pipe blanks, integrates a plurality of processes of preventing and controlling the excess and eliminating the interlayer clearance into the forming process of the corrugated pipe, ensures the product quality and enables the production process to be efficient and convenient. The invention does not need to set a special procedure for eliminating the interlayer clearance, eliminates the clearance by using the forming pressure in the forming process of the corrugated pipe, controls the excess, solves the problem of preventing the entry of the excess such as water and the like while discharging the air between the layers of the pipe blank in the forming process, and has the advantages of high efficiency and convenience.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention does not need to set a special procedure for eliminating the interlayer gap, eliminates the gap by using the molding pressure in the corrugated pipe molding process, controls the redundant substances and has the characteristics of high efficiency and convenience.
(2) The method for preventing and controlling the excess between the layers is arranged while the interlayer clearance is eliminated, and the product quality is effectively guaranteed while the method has higher efficiency.
Drawings
FIG. 1 is a schematic diagram of a bellows redundancy control method according to an embodiment of the present invention;
FIG. 2 is a schematic view of an integral hydroformed bellows and a process wave forming process according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a single-wave progressive hydroformed bellows and a process wave forming process according to an embodiment of the present invention;
FIG. 4(a) is a schematic diagram of a process margin removal method for an integral hydroformed bellows according to an embodiment of the present invention;
fig. 4(b) is a schematic diagram of a process margin removing manner of the single-wave successive hydroformed bellows according to the embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides a method for controlling interlayer surplus of a multilayer metal corrugated pipe and eliminating interlayer gaps, which is characterized by comprising the following steps of:
step 1: manufacturing a plurality of single-layer tube blanks with different diameters;
step 2: sleeving a plurality of single-layer tube blanks to form a multi-layer tube blank;
and step 3: performing sealing seam welding on two ends of the multilayer tube blank respectively;
and 4, step 4: assembling the multilayer tube blank with a corrugated tube forming die, wherein the corrugated tube forming die is provided with a process wave structure, a gap is arranged between the corrugated tube forming die and the tube blank, and then performing hydraulic forming on the corrugated tube;
and 5: performing secondary roll welding at positions needing to be cut at two ends of the corrugated pipe;
step 6: and machining and removing allowance at the secondary roll welding position.
According to one embodiment of the invention, the unilateral clearance of the multiple single-layer tube blank sets in the steps 1 and 2 is not more than 0.5 times of the material wall thickness.
According to one embodiment of the invention, the excess on the inner surface and the outer surface of each layer of tube blank is cleaned before the multiple layers of tube blanks are sleeved in the step 2.
According to an embodiment of the present invention, the process wave structure of the mold in step 4 is formed on both ends of the outer side of the corrugated pipe.
According to one embodiment of the invention, the unilateral clearance between the die and the tube blank in the step 4 is not more than 2 times of the material wall thickness, and the amount of thinning of the forming is calculated to meet the design requirement.
According to an embodiment of the present invention, the hydraulic forming of the corrugated pipe in step 4 may adopt an integral hydraulic bulging or a single-wave hydraulic successive bulging manner: the bellows with smaller size and smaller forming pressure adopts integral hydraulic bulging; aiming at the corrugated pipe with larger size and larger required forming pressure, a single-wave successive bulging mode is adopted to reduce the pressure bearing requirement of equipment, and when the single-wave successive bulging is carried out, a water injection head is adopted to move from the center to the left end and the right end in sequence to carry out bulging, so that interlayer gas is pressed to process waves at the two ends.
According to an embodiment of the present invention, the machining allowance removal in step 6 may be selected from a turning and a wire cutting manner.
Referring to fig. 1, fig. 2, fig. 3, fig. 4(a), and fig. 4(b), the method for controlling the excess between the layers of the multilayer metal corrugated pipe and eliminating the interlayer gap includes the following steps:
step 1: and manufacturing a plurality of single-layer tube blanks by means of plate rolling welding or seamless tube blanking and the like. Wherein the diameter of the manufactured single-layer tube blanks meets the condition that the unilateral clearance of the tube blanks is 0.5 times of the wall thickness when the tube blanks are sequentially sleeved from inside to outside.
Step 2: the excess materials on the inner and outer surfaces of the tube blank are removed by acid cleaning, alkali cleaning, gasoline cleaning, gas blowing and the like, and then the multi-layer tube blank is sleeved from inside to outside.
And step 3: and immediately performing one-time roll welding and sealing on two ends of the multilayer tube blank after the sheathing is finished, and avoiding the entry of redundant materials, as shown in figure 1.
And 4, step 4: and assembling the multilayer tube blank subjected to roll welding and sealing with a corrugated tube forming die, wherein the die has a process wave forming structure and is symmetrically arranged on the outer sides of straight tube sections on two sides of the corrugated tube. The clearance between the inner diameter of the die and the outer diameter of the tube blank is 1 time of the wall thickness. After assembly, the corrugated pipe is integrally formed by hydraulic pressure (figure 2) or is formed by single-wave hydraulic pressure in a successive mode (figure 3).
And 5: and (3) performing roll welding on the straight pipe sections at two ends of the corrugated pipe, and showing fig. 4(a) or fig. 4 (b).
Step 6: and removing the structures such as the process waves on the two sides along the center of the seam welding to obtain the multilayer corrugated pipe, which is shown in figure 3.
According to the invention, the clearance and the surplus objects between the layers of the corrugated pipe are controlled by the ways of setting the sleeving clearance and the diameter of the pipe blank, roll-welding and sealing, adding a process wave structure on the corrugated pipe mould and the like, and the two methods are organically integrated in the forming process of the corrugated pipe, so that the quality is ensured and the efficiency is higher.
It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A method for controlling the excess among the layers of a multilayer metal corrugated pipe and eliminating the interlayer clearance is characterized by comprising the following steps:
step 1: manufacturing a plurality of single-layer tube blanks with different diameters;
step 2: sleeving a plurality of single-layer tube blanks to form a multi-layer tube blank;
and step 3: performing sealing seam welding on two ends of the multilayer tube blank respectively;
and 4, step 4: assembling the multilayer tube blank with a corrugated tube forming die, wherein the corrugated tube forming die is provided with a process wave structure, a gap is arranged between the corrugated tube forming die and the tube blank, and then performing hydraulic forming on the corrugated tube;
and 5: performing secondary roll welding at positions needing to be cut at two ends of the corrugated pipe;
step 6: and machining and removing allowance at the secondary roll welding position.
2. A method for controlling the interlayer surplus and eliminating the interlayer gap of the multilayer metal corrugated pipe according to claim 1, wherein the unilateral gap of the sleeving of the single-layer pipe blanks in the steps 1 and 2 is not more than 0.5 times of the wall thickness of the material.
3. A method for controlling the excess between layers and eliminating the gap between layers of multi-layer metal corrugated pipe according to claim 1, wherein the excess on the inner and outer surfaces of each layer of pipe is removed before the multi-layer pipe is sleeved in step 2.
4. A method for controlling the interlayer redundancy and eliminating the interlayer gap of the multi-layer metal corrugated pipe according to claim 1, wherein the process wave structure of the mold in step 4 is formed on both ends of the outer side of the corrugated pipe.
5. A method for controlling the interlayer surplus and eliminating the interlayer clearance of the multilayer metal corrugated pipe as claimed in claim 1, wherein the unilateral clearance between the die and the pipe blank in the step 4 is not more than 2 times of the wall thickness of the material, and the amount of the reduction of the forming should be calculated to meet the design requirement.
6. A method for controlling the interlaminar redundancies and eliminating the interlaminar gaps of the multilayer metal corrugated pipe according to claim 1, wherein in the step 4, the hydraulic forming of the corrugated pipe adopts an integral hydraulic bulging or a single-wave hydraulic successive bulging mode.
7. A method for controlling the interlayer redundancy and eliminating the interlayer gap of the multilayer metal corrugated pipe according to claim 6, wherein the machining for removing the allowance in the step 6 can be selected from turning and linear cutting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111530217.XA CN114192603A (en) | 2021-12-14 | 2021-12-14 | Method for controlling interlayer redundancy and eliminating interlayer gap of multilayer metal corrugated pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111530217.XA CN114192603A (en) | 2021-12-14 | 2021-12-14 | Method for controlling interlayer redundancy and eliminating interlayer gap of multilayer metal corrugated pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114192603A true CN114192603A (en) | 2022-03-18 |
Family
ID=80653753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111530217.XA Pending CN114192603A (en) | 2021-12-14 | 2021-12-14 | Method for controlling interlayer redundancy and eliminating interlayer gap of multilayer metal corrugated pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114192603A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10277660A (en) * | 1997-04-11 | 1998-10-20 | Hitachi Ltd | Method and device for hydrostatic forming, manufacture of bellows, and tubular structure |
| CN1383943A (en) * | 2002-06-14 | 2002-12-11 | 张凯锋 | Superplastic forming process of titanium alloy corrugated pipe |
| CN101537460A (en) * | 2009-04-17 | 2009-09-23 | 秦皇岛北方管业有限公司 | Thin-walled multiply bellows straight-side port closing device |
| CN105458058A (en) * | 2014-09-11 | 2016-04-06 | 首都航天机械公司 | Method for decreasing or eliminating interlayer gaps of multi-layer corrugated pipe |
| CN105642728A (en) * | 2015-12-08 | 2016-06-08 | 中国重型机械研究院股份公司 | Device and method for shaping double-metal composite pipe by liquid expansion of elastic material |
| CN109834150A (en) * | 2019-01-08 | 2019-06-04 | 上海航天精密机械研究所 | More wave duct hydraulic expanding-forming forming devices and method |
| CN112903174A (en) * | 2020-12-30 | 2021-06-04 | 南京晨光东螺波纹管有限公司 | Corrugated pipe for nuclear fusion and manufacturing process thereof |
-
2021
- 2021-12-14 CN CN202111530217.XA patent/CN114192603A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10277660A (en) * | 1997-04-11 | 1998-10-20 | Hitachi Ltd | Method and device for hydrostatic forming, manufacture of bellows, and tubular structure |
| CN1383943A (en) * | 2002-06-14 | 2002-12-11 | 张凯锋 | Superplastic forming process of titanium alloy corrugated pipe |
| CN101537460A (en) * | 2009-04-17 | 2009-09-23 | 秦皇岛北方管业有限公司 | Thin-walled multiply bellows straight-side port closing device |
| CN105458058A (en) * | 2014-09-11 | 2016-04-06 | 首都航天机械公司 | Method for decreasing or eliminating interlayer gaps of multi-layer corrugated pipe |
| CN105642728A (en) * | 2015-12-08 | 2016-06-08 | 中国重型机械研究院股份公司 | Device and method for shaping double-metal composite pipe by liquid expansion of elastic material |
| CN109834150A (en) * | 2019-01-08 | 2019-06-04 | 上海航天精密机械研究所 | More wave duct hydraulic expanding-forming forming devices and method |
| CN112903174A (en) * | 2020-12-30 | 2021-06-04 | 南京晨光东螺波纹管有限公司 | Corrugated pipe for nuclear fusion and manufacturing process thereof |
Non-Patent Citations (3)
| Title |
|---|
| 王文芳: "外压非平衡直管式波纹管", 材料开发与应用, no. 06, pages 35 - 41 * |
| 简翰鸣等: ""薄壁多层不锈钢波纹管整体成形工艺"", 《锻压技术》, vol. 46, no. 4, pages 81 - 88 * |
| 简翰鸣等: "薄壁多层不锈钢波纹管整体成形工艺", 锻压技术, vol. 46, no. 04, pages 81 - 88 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101052740B (en) | Tubular target | |
| CN111438223B (en) | Integral forming method for rectangular metal corrugated pipe | |
| CN108580622B (en) | Design method of in-mold radial extrusion forming process of I-shaped longitudinal rib ring piece | |
| CN106090091B (en) | Metal-rubber joint radial direction limit method and metal-rubber joint assembly | |
| CN110479841B (en) | Multi-pass multi-directional rotary rolling forming method for large transverse high-rib thin-wall ring piece | |
| CN105598265A (en) | Overall forming method of small-relative-bending-radius and large-diameter-thickness-ratio thin-walled bent pipe fitting | |
| CN105312372A (en) | Car auxiliary frame and forming method | |
| CN103464986B (en) | A kind of method manufacturing automobile air conditioner silencer | |
| CN105583252A (en) | Hydroforming method of axis continuous bending special-shaped pipe fitting | |
| CN113020423A (en) | Forming method of dissimilar metal laminated thin-wall cylindrical part | |
| CN103920765B (en) | Thin metallic tubd pushes away o ing method | |
| CN102756033B (en) | The quick liquid-filling shaping method and system of multilayer pipe | |
| CN105598248A (en) | Device for increasing pipe wall thickness through internal high pressure forming and process thereof | |
| US11034073B2 (en) | Method for forming inline triple wall coupling connector | |
| CN114192603A (en) | Method for controlling interlayer redundancy and eliminating interlayer gap of multilayer metal corrugated pipe | |
| CN102091746A (en) | Compound molding process of integral automobile body metal stamping part | |
| CN1440842A (en) | Inner high pressure and reducing formation process of automobile axle shell | |
| CN113680932A (en) | Near-net composite rolling forming method for large-sized outer contour abrupt cross-section ring piece | |
| CN107931963B (en) | A method of manufacture TC4 titanium alloy bores barrel-shaped multilayered structure | |
| CN113909385B (en) | Production mold and production method of corrugated pipe with uniform wall thickness | |
| CN110666022B (en) | Preparation method of high-temperature alloy semi-closed double-layer thin-wall-structure adapter tube | |
| CN113927257B (en) | Processing method of spiral baffle | |
| CN207486256U (en) | A kind of Novel metal pipe | |
| CN112453091B (en) | Undulating surface mold core for dissimilar metal co-extrusion, extrusion mold and extrusion method | |
| CN111992592A (en) | Double-flow regulation and control pressure forming equipment, system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |