CN106424347A - Rounding and sizing processing mould for pipe fittings - Google Patents
Rounding and sizing processing mould for pipe fittings Download PDFInfo
- Publication number
- CN106424347A CN106424347A CN201610359518.3A CN201610359518A CN106424347A CN 106424347 A CN106424347 A CN 106424347A CN 201610359518 A CN201610359518 A CN 201610359518A CN 106424347 A CN106424347 A CN 106424347A
- Authority
- CN
- China
- Prior art keywords
- core
- mold
- rises
- mould
- pipe fitting
- 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
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Classifications
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
-
- 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
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/18—Lubricating, e.g. lubricating tool and workpiece simultaneously
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention relates to a rounding and sizing processing mould for pipe fittings. The rounding and sizing processing mould comprises a cap, an expanding core, mould pieces, a cover plate, a mould base and an expanding core base, wherein a ring-shaped cavity is arranged on the top of the mould base; a mounting slot is formed in the bottom of the mould base; through holes are formed inside the cap and the expanding core; a drawbar is arranged in the through holes; an oil injecting hole is formed in the top of the drawbar; a regulating gasket is arranged in front of the expanding core base and the expanding core; edges of cross sections of the plurality of mould pieces are arc-shaped, and are on the same circle D; a first elastic ring is arranged between the outer walls of the mould pieces and the mould base; the inner walls of the mould pieces are in clearance fit with conical surfaces of the expanding core; second limiting slots are formed in the inner walls of the mould pieces; limiting slide blocks are arranged between the second limiting slots and first limiting slots; and second elastic rings are arranged in grooves of the plurality of the mould pieces. The rounding and sizing processing mould is precise in structure, is reasonable in design, is convenient to dismount and maintain, can be used for simultaneously carrying out sizing, rounding and processing on pipe fittings, is stable in sizing, rounding and processing quality, is convenient and quick in oil injecting and lubricating, and is beneficial for improving processing efficiency and prolonging the service life of the mould.
Description
Technical field
The present invention relates to a kind of pipe fitting full circle sizing processing mold, belong to auto parts and components processing technique field.
Background technology
With the fast development of China's automobile industry, engineering construction technology, the quality requirements more and more higher to pipe fitting for the market,
Thus promoting the fast development of pipe fitting processing mold.Traditional pipe fitting sizing die is typically only capable to carry out simple enlarging sizing, by
Having, in flaring die, the core that rises is many valve structures, and it is poor that the product after enlarging has a circularity dimensional accuracy, have impact on product matter
Amount, the tube outer diameter size after processing is difficult to accurately ensure, simultaneously mechanical oil injecting lubricating inconvenience, easily causes the mobile clamping stagnation of cooperation existing
As thus affecting working (machining) efficiency and die life.
Content of the invention
The purpose of the present invention is the defect for prior art, provides a kind of pipe fitting full circle sizing processing mold, can be to pipe
Part carries out sizing full circle processing simultaneously, and oil injecting lubricating is convenient and swift, beneficial to raising working (machining) efficiency and die life.
The present invention is achieved by the following technical solutions：
A kind of pipe fitting full circle sizing processing mold, including simultaneously cap, the core that rises, mold section, cover plate, mold base and the core print seat that rises, wherein, described
Mold base top is provided with annular housing, and described mold base bottom is provided with mounting groove, and described mounting groove is connected with annular housing, described
The core that rises is in the positive polygonal pyramid physique structure standing upside down, described rise core top with and cap be connected, described and cap is equipped with the core inner that rises
Through hole, is provided with pull bar in described through hole；
Described pull bar top is connected with the core that rises, and described pull bar top is provided with oil filler point, and described pull bar is provided with some first lubrications
Oilhole, described first oilhole is connected with oil filler point, and described pull bar bottom passes through annular housing and mounting groove and the core print seat phase that rises
Even, described rise by core print seat with the core that rises before be provided with adjustment packing ring, described adjustment packing ring bottom is provided with bulge loop, described bulge loop and mounting groove
Cooperation；
The described core that rises is provided with some second oilholes, described second oilhole respectively with the first oilhole and rising outside core
Wall connects, and the described outer core that rises includes several conical surfaces, and the described conical surface is provided with the first stopper slot；
Described mold section has several, the ringwise uniform intervals distribution of some mold sections, and the cross-sectional edge of some mold sections is arc, and
On same circle D, some mold section bottoms are placed in the annular housing of mold base, set between described mold section outer wall and mold base
There is the first elastic ring, described mold section inwall is coordinated with the conical surface gap of the core that rises, and is provided with the second stopper slot, described second stopper slot
It is provided with position limiting slide block and the first stopper slot between, some mold section side roof parts are provided with groove, are provided with the second elastic ring in described groove,
Described cover plate is connected through mold section with mold base.
A kind of above-mentioned pipe fitting full circle sizing processing mold, wherein, described rise core and and cap between be provided with some pin-and-holes.
A kind of above-mentioned pipe fitting full circle sizing processing mold, wherein, described and cap inwall is equipped with internal thread, outside described pull bar
Wall is equipped with external screw thread, by internal thread and external screw thread cooperation, realizes pull bar top and is connected with the core that rises.
A kind of above-mentioned pipe fitting full circle sizing processing mold, wherein, the V-shaped structure of described second oilhole shaft section, and
Each two second oilhole is arranged on the same conical surface.
A kind of above-mentioned pipe fitting full circle sizing processing mold, wherein, the number of described mold section and the conical surface is eight.
A kind of above-mentioned pipe fitting full circle sizing processing mold, wherein, described cover plate is provided with some fastening installing holes, some tight
Gu installing hole ringwise uniform intervals distribution, described fastening is installed in the hole and is provided with bolt, passes through mold base by bolt, realizes lid
Plate is connected with mold base.
Beneficial effects of the present invention are：
To rise by core print seat upwardly, and drive the core that rises to move up by pull bar, because the core that rises is in the positive polygonal pyramid body knot standing upside down
Structure, during upper shifting, makes some mold sections inwardly tighten up under the deformation compression of the first elastic ring and the second elastic ring, circle
Shape diameter D reduces, and when round diameter is less than pipe fitting internal diameter, pipe fitting is packed into mold section；The core print seat that subsequently will rise moves down, and draws
The dynamic core that rises moves down, and so that mold section is outwards expanded, and round diameter D increases, until during the theoretical value of pipe fitting internal diameter, now circular
Diameter D is equal with the theoretical value of pipe fitting, reaches the purpose to pipe fitting full circle sizing.
Only need during lubrication with oil syringe from simultaneously cap through hole filling lubricating oil to oiling in the hole, from the first oilhole and second
Oilhole flows out to mold section and the core matching surface that rises, you can realize each mold section and the lubrication rising between core, play prevent bite,
Corrosion is it is ensured that the effect of processing stability and fluency.
The present invention adopts pin-and-hole, screw thread cooperation and bolt this demountable structure of fastening it is ensured that device maintenance and installation is changed
Convenient；By bulge loop and mounting groove cooperation spacing to realize pull bar ejection be now spacing, by position limiting slide block in the first stopper slot and
Move in second stopper slot, realization is risen, and core movement is spacing, convenient and reliable, and mold section expansion simultaneously is shunk mold section expansion contraction movement and led
Tropism it is ensured that mold section curved edge circularity, thus improving crudy；Using eight mold sections it is ensured that full circle processing circularity, hold
Pressure property and smoothness；By the tightening force of elastic ring it is ensured that mold section and the core fitment stability that rises.
To sum up, present configuration is accurate, reasonable in design, and detachable maintaining is convenient, can carry out sizing full circle to pipe fitting simultaneously add
Work, sizing full circle crudy is stable, and oil injecting lubricating is convenient and swift, beneficial to raising working (machining) efficiency and die life.
Brief description
Fig. 1 is present configuration figure.
Fig. 2 is front view of the present invention.
Fig. 3 is main view AA generalized section of the present invention.
Fig. 4 is main view AA section B portion of the present invention enlarged diagram.
Fig. 5 is main view CC generalized section of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described further.
A kind of pipe fitting full circle sizing processing mold, including simultaneously cap 1, the core 2 that rises, mold section 3, cover plate 4, mold base 5 and the core print seat that rises
6, wherein, described mold base 5 top is provided with annular housing 7, and described mold base 5 bottom is provided with mounting groove 8, described mounting groove 8 with
Annular housing 7 connects, described rise core 2 be in stand upside down positive polygonal pyramid physique structure, described rise core 2 top with and cap 1 be connected, described
Rise core 2 and and cap 1 between be provided with some pin-and-holes 9, be equipped with through hole 10 inside described and cap 1 and the core 2 that rises, set in described through hole 10
There is pull bar 11；
Described and cap 1 inwall is equipped with internal thread 12, and described pull bar 11 outer wall is equipped with external screw thread 13, by internal thread 12 with outward
Screw thread 13 coordinates, and realizes pull bar 11 top and is connected with the core 2 that rises, and described pull bar 11 top is provided with oil filler point 14, on described pull bar 11
It is provided with some first oilholes 15, described first oilhole 15 is connected with oil filler point 14, described pull bar 11 bottom passes through ring
Shape cavity 7 is connected with the core print seat 6 that rises with mounting groove 8, described rise by core print seat 6 with the core 2 of rising before be provided with adjustment packing ring 16, described adjusting pad
Enclose 16 bottoms and be provided with bulge loop 17, described bulge loop 17 and mounting groove 8 coordinate spacing；
The described core 2 that rises is provided with some second oilholes 18, described second oilhole 18 respectively with the first oilhole 15
Core 2 outer wall connects with rising, and described core 2 outer wall that rises includes several conical surfaces 19, the V-shaped knot of described second oilhole 18 shaft section
Structure, and each two the second oilhole 18 is arranged on the same conical surface 19, the described conical surface 19 is provided with the first stopper slot 20；
The number of described mold section 3 and the conical surface 19 is eight, and ringwise uniform intervals are distributed the horizontal stroke of eight mold sections 3 for eight mold sections 3
Section edges are arc, and on same circle D, eight mold section 3 bottoms are placed in the annular housing 7 of mold base 5, described mould
It is provided with the first elastic ring 21, described mold section 3 inwall is coordinated with the conical surface 19 gap of the core 2 that rises between lobe 3 outer wall and mold base 5, and
It is provided with the second stopper slot 22, between described second stopper slot 22 and the first stopper slot 20, be provided with position limiting slide block 23, eight mold section 3 sides
Top is provided with groove 24, is provided with the second elastic ring 25 in described groove 24, and described cover plate 4 is provided with some fastening installing holes 26,
Some fastening installing hole 26 ringwise uniform intervals distributions, are provided with bolt 27 in described fastening installing hole 26, are worn by bolt 27
Cross mold base, realize cover plate 4 and be connected with mold base 5 through mold section 3.
The working method of the present invention is：
To rise by core print seat upwardly, and drive the core that rises to move up by pull bar, because the core that rises is in the positive polygonal pyramid body knot standing upside down
Structure, during upper shifting, makes some mold sections inwardly tighten up under the deformation compression of the first elastic ring and the second elastic ring, circle
Shape diameter D reduces, and when round diameter is less than pipe fitting internal diameter, pipe fitting cylinder 28 is packed into mold section；The core print seat that subsequently will rise is downward
Mobile, pull the core that rises to move down, so that mold section is outwards expanded, round diameter D increases, until during the theoretical value of pipe fitting internal diameter, this
When round diameter D equal with the theoretical value of pipe fitting, reach the purpose to pipe fitting full circle sizing.
Only need during lubrication with oil syringe from simultaneously cap through hole filling lubricating oil to oiling in the hole, from the first oilhole and second
Oilhole flows out to mold section and the core matching surface that rises, you can realize each mold section and the lubrication rising between core, play prevent bite,
Corrosion is it is ensured that the effect of processing stability and fluency.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in,
All should cover within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection domain of claims
It is defined.
Claims (6)
1. a kind of pipe fitting full circle sizing processing mold, including simultaneously cap, the core that rises, mold section, cover plate, mold base and the core print seat that rises, its feature
For described mold base top is provided with annular housing, and described mold base bottom is provided with mounting groove, and described mounting groove is with annular housing even
Logical, the described core that rises is in the positive polygonal pyramid physique structure standing upside down, described rise core top with and cap be connected, described and cap and the core inner that rises
It is equipped with through hole, in described through hole, be provided with pull bar；
Described pull bar top is connected with the core that rises, and described pull bar top is provided with oil filler point, and described pull bar is provided with some first lubrications
Oilhole, described first oilhole is connected with oil filler point, and described pull bar bottom passes through annular housing and mounting groove and the core print seat phase that rises
Even, described rise by core print seat with the core that rises before be provided with adjustment packing ring, described adjustment packing ring bottom is provided with bulge loop, described bulge loop and mounting groove
Cooperation；
The described core that rises is provided with some second oilholes, described second oilhole respectively with the first oilhole and rising outside core
Wall connects, and the described outer core that rises includes several conical surfaces, and the described conical surface is provided with the first stopper slot；
Described mold section has several, the ringwise uniform intervals distribution of some mold sections, and the cross-sectional edge of some mold sections is arc, and
On same circle D, some mold section bottoms are placed in the annular housing of mold base, set between described mold section outer wall and mold base
There is the first elastic ring, described mold section inwall is coordinated with the conical surface gap of the core that rises, and is provided with the second stopper slot, described second stopper slot
It is provided with position limiting slide block and the first stopper slot between, some mold section side roof parts are provided with groove, are provided with the second elastic ring in described groove,
Described cover plate is connected through mold section with mold base.
2. a kind of pipe fitting full circle sizing processing mold as claimed in claim 1, it is characterized by, described rise core and and cap between set
There are some pin-and-holes.
3. a kind of pipe fitting full circle sizing processing mold as claimed in claim 1, it is characterized by, in described and cap inwall is equipped with
Screw thread, described pull bar outer wall is equipped with external screw thread, by internal thread and external screw thread cooperation, realizes pull bar top and is connected with the core that rises.
4. a kind of pipe fitting full circle sizing processing mold as claimed in claim 1, it is characterized by, described second lubricating oil hole axle is cut
The V-shaped structure in face, and each two second oilhole is arranged on the same conical surface.
5. a kind of pipe fitting full circle sizing processing mold as claimed in claim 1, it is characterized by, the number of described mold section and the conical surface
It is eight.
6. a kind of pipe fitting full circle sizing processing mold as claimed in claim 1, it is characterized by, described cover plate is provided with some tight
Gu installing hole, the ringwise uniform intervals distribution of some fastening installing holes, described fastening is installed in the hole and is provided with bolt, worn by bolt
Cross mold base, realize cover plate and be connected with mold base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610359518.3A CN106424347A (en) | 2016-05-27 | 2016-05-27 | Rounding and sizing processing mould for pipe fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610359518.3A CN106424347A (en) | 2016-05-27 | 2016-05-27 | Rounding and sizing processing mould for pipe fittings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106424347A true CN106424347A (en) | 2017-02-22 |
Family
ID=58183175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610359518.3A Pending CN106424347A (en) | 2016-05-27 | 2016-05-27 | Rounding and sizing processing mould for pipe fittings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106424347A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107042249A (en) * | 2017-06-20 | 2017-08-15 | 凯龙高科技股份有限公司 | A kind of multistation trimmer for short thin-walled tubes part |
| CN107583971A (en) * | 2017-10-17 | 2018-01-16 | 柳州北斗星液压科技有限公司 | Device for finishing steel ring |
| CN107649574A (en) * | 2017-09-21 | 2018-02-02 | 佛山市汉道金属制品有限公司 | Centrifugal wind wheel mould |
| CN108405737A (en) * | 2018-03-21 | 2018-08-17 | 芜湖得瑞精密机械有限公司 | Sizing mill |
| CN109013936A (en) * | 2018-07-20 | 2018-12-18 | 中北大学 | Large-size cylinder body workpiece realizes the mold of whole necking down process |
| CN109277437A (en) * | 2018-10-10 | 2019-01-29 | 中国航发哈尔滨东安发动机有限公司 | Bind round circle device in a kind of thin-wall tube shaft end portion |
| CN109530491A (en) * | 2018-12-19 | 2019-03-29 | 浙江振兴阿祥集团有限公司 | A kind of non-lubricating rises type rounding die |
| CN109591132A (en) * | 2019-01-30 | 2019-04-09 | 湖南银山竹业有限公司 | A kind of expansion circle method and apparatus of thick bamboo tube |
| CN110802139A (en) * | 2019-11-15 | 2020-02-18 | 西安西电开关电气有限公司 | Plastic roundness correction device |
| CN111151597A (en) * | 2020-02-07 | 2020-05-15 | 东莞市豪准金属制品有限公司 | Inner diameter expander |
| CN112958768A (en) * | 2021-01-29 | 2021-06-15 | 向朝霞 | Manufacturing process for producing bimetallic sliding bearing by adopting radial reaming method |
| CN113921335A (en) * | 2021-10-09 | 2022-01-11 | 安徽中骄智能科技有限公司 | Sealing structure and sealing method for plastic sealing new energy high-voltage direct-current relay |
| CN114472719A (en) * | 2022-01-21 | 2022-05-13 | 广州铮高精密机械有限公司 | Pipe expanding die with die sheet adjusting structure and adjusting method thereof |
| CN115815376A (en) * | 2022-12-09 | 2023-03-21 | 江苏中通管业有限公司 | Roundness correction device and steel pipe production process |
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| JPH04238628A (en) * | 1991-01-09 | 1992-08-26 | Sumitomo Metal Ind Ltd | Method and device for straightening dimension of large diameter tube |
| CN2749596Y (en) * | 2004-11-25 | 2006-01-04 | 西北有色金属研究院 | Metal pipe straightening die set |
| CN202207724U (en) * | 2011-08-31 | 2012-05-02 | 西部钛业有限责任公司 | Sag repair device for thin-wall metal tube |
| CN103008486A (en) * | 2012-12-03 | 2013-04-03 | 镇江市恒源汽车零部件有限公司 | Pipe fitting flaring sizing mill |
| CN103447399A (en) * | 2013-09-05 | 2013-12-18 | 无锡双友石化机械有限公司 | Oil way system of lubricating ring of hole enlarging head |
| CN205763344U (en) * | 2016-05-27 | 2016-12-07 | 镇江市恒源汽车零部件有限公司 | A kind of pipe fitting full circle sizing processing mold |
-
2016
- 2016-05-27 CN CN201610359518.3A patent/CN106424347A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04238628A (en) * | 1991-01-09 | 1992-08-26 | Sumitomo Metal Ind Ltd | Method and device for straightening dimension of large diameter tube |
| CN2749596Y (en) * | 2004-11-25 | 2006-01-04 | 西北有色金属研究院 | Metal pipe straightening die set |
| CN202207724U (en) * | 2011-08-31 | 2012-05-02 | 西部钛业有限责任公司 | Sag repair device for thin-wall metal tube |
| CN103008486A (en) * | 2012-12-03 | 2013-04-03 | 镇江市恒源汽车零部件有限公司 | Pipe fitting flaring sizing mill |
| CN103447399A (en) * | 2013-09-05 | 2013-12-18 | 无锡双友石化机械有限公司 | Oil way system of lubricating ring of hole enlarging head |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107042249A (en) * | 2017-06-20 | 2017-08-15 | 凯龙高科技股份有限公司 | A kind of multistation trimmer for short thin-walled tubes part |
| CN107649574A (en) * | 2017-09-21 | 2018-02-02 | 佛山市汉道金属制品有限公司 | Centrifugal wind wheel mould |
| CN107649574B (en) * | 2017-09-21 | 2019-01-29 | 佛山市顺德区容齐五金电器有限公司 | Centrifugal wind wheel molding die |
| CN107583971A (en) * | 2017-10-17 | 2018-01-16 | 柳州北斗星液压科技有限公司 | Device for finishing steel ring |
| CN108405737A (en) * | 2018-03-21 | 2018-08-17 | 芜湖得瑞精密机械有限公司 | Sizing mill |
| CN109013936A (en) * | 2018-07-20 | 2018-12-18 | 中北大学 | Large-size cylinder body workpiece realizes the mold of whole necking down process |
| CN109277437A (en) * | 2018-10-10 | 2019-01-29 | 中国航发哈尔滨东安发动机有限公司 | Bind round circle device in a kind of thin-wall tube shaft end portion |
| CN109530491B (en) * | 2018-12-19 | 2024-06-07 | 浙江振兴阿祥集团有限公司 | Lubrication-free expansion rounding die |
| CN109530491A (en) * | 2018-12-19 | 2019-03-29 | 浙江振兴阿祥集团有限公司 | A kind of non-lubricating rises type rounding die |
| CN109591132A (en) * | 2019-01-30 | 2019-04-09 | 湖南银山竹业有限公司 | A kind of expansion circle method and apparatus of thick bamboo tube |
| CN110802139B (en) * | 2019-11-15 | 2022-03-18 | 西安西电开关电气有限公司 | Plastic roundness correction device |
| CN110802139A (en) * | 2019-11-15 | 2020-02-18 | 西安西电开关电气有限公司 | Plastic roundness correction device |
| CN111151597A (en) * | 2020-02-07 | 2020-05-15 | 东莞市豪准金属制品有限公司 | Inner diameter expander |
| CN111151597B (en) * | 2020-02-07 | 2024-05-17 | 东莞市豪准金属制品有限公司 | Inner diameter expander |
| CN112958768A (en) * | 2021-01-29 | 2021-06-15 | 向朝霞 | Manufacturing process for producing bimetallic sliding bearing by adopting radial reaming method |
| CN113921335A (en) * | 2021-10-09 | 2022-01-11 | 安徽中骄智能科技有限公司 | Sealing structure and sealing method for plastic sealing new energy high-voltage direct-current relay |
| CN114472719A (en) * | 2022-01-21 | 2022-05-13 | 广州铮高精密机械有限公司 | Pipe expanding die with die sheet adjusting structure and adjusting method thereof |
| CN114472719B (en) * | 2022-01-21 | 2024-01-26 | 广州铮高精密机械有限公司 | Pipe expanding die with die sheet adjusting structure and adjusting method thereof |
| CN115815376A (en) * | 2022-12-09 | 2023-03-21 | 江苏中通管业有限公司 | Roundness correction device and steel pipe production process |
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Application publication date: 20170222 |