CN114247754A - Telescopic pilger core rod - Google Patents
Telescopic pilger core rod Download PDFInfo
- Publication number
- CN114247754A CN114247754A CN202010990855.9A CN202010990855A CN114247754A CN 114247754 A CN114247754 A CN 114247754A CN 202010990855 A CN202010990855 A CN 202010990855A CN 114247754 A CN114247754 A CN 114247754A
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- China
- Prior art keywords
- section
- oil
- cavity
- oil return
- oil inlet
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- 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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- 230000007704 transition Effects 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000009785 tube rolling Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
- B21B25/04—Cooling or lubricating mandrels during operation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Actuator (AREA)
Abstract
The invention belongs to the technical field of cold pilger mills, and particularly relates to a telescopic pilger mandrel. The hydraulic support device comprises a capillary tube section, a transition section and a support section, wherein a threaded connecting block is arranged at the left end of the capillary tube section, an oil return cavity is formed in the right end face of the transition section, the threaded connecting block is in threaded connection with the oil return cavity, an oil inlet cavity is formed in the left end face of the transition section and is communicated with the oil return cavity, a limiting boss is arranged between the oil inlet cavity and the oil return cavity, the right end of the support section is arranged in the oil inlet cavity, the right end of the support section is connected with a limiting block through a connecting rod, and the limiting block is located in the oil return cavity.
Description
Technical Field
The invention belongs to the technical field of cold pilger mills, and particularly relates to a telescopic pilger mandrel.
Background
The seamless steel pipe industry in China has been the largest global seamless steel pipe producing country and consumer country after ten years of rapid development, and annual output accounts for 70% of the global proportion all the time. At present, China has built various advanced seamless steel pipe production lines with more than one strip, the total output can reach 4500 ten thousand tons, wherein the seamless steel pipes are mainly of a periodic pipe mill, and the number of the periodic pipe mill units is increased gradually at a higher speed every year.
At present, most of the mandrel bars of the periodic tube rolling mills at home and abroad adopt a solid structure, and the mandrel bars are rolled according to the reciprocating process of periodic rolling through a roller with a hole pattern with a section which is changed according to a certain rule. Once the solid core rod is in poor lubrication condition during rolling, the solid core rod is easy to seize, namely the solid core rod is commonly called as 'stuffy car', and the rolling efficiency is greatly reduced.
Disclosure of Invention
The invention provides a telescopic pilger mandrel aiming at the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
a telescopic pilger mandrel comprises a pilger section, a transition section and a support section, wherein a threaded connecting block is arranged at the left end of the pilger section, an oil return cavity is formed in the right end face of the transition section, the threaded connecting block is in threaded connection with the oil return cavity, an oil inlet cavity is formed in the left end face of the transition section and is communicated with the oil return cavity, a limiting boss is arranged between the oil inlet cavity and the oil return cavity, the right end of the support section is arranged in the oil inlet cavity, the inner diameter of the oil inlet cavity is the same as that of the support section, a limiting block is connected to the right end of the support section through a connecting rod and is positioned in the oil return cavity, the diameter of the limiting block is the same as that of the oil return cavity, an oil return channel communicated with the oil return cavity is arranged on the pilger section, and an oil inlet channel communicated with the oil inlet cavity is arranged on the support section, the oil return passage and the oil return passage are respectively provided with a switch valve, the oil inlet passage and the oil return passage are respectively connected with a three-position four-way reversing valve through an oil inlet pipe and an oil return pipe, the three-position four-way reversing valve is connected with a hydraulic pump through a pipeline, the hydraulic pump is connected with an oil tank through a pipeline, and an overflow valve is arranged between the three-position four-way reversing valve and the hydraulic pump.
Furthermore, the transition section consists of a connecting section and a deformation section, the connecting section is cylindrical, the diameter of the connecting section is the same as that of the tubular billet section, and the deformation section is arc-shaped and has the same shape as the pass of the roller groove.
Still further, the outer surface of the support section is plated with a hard alloy layer.
Compared with the prior art, the invention has the following advantages:
1. the support section is driven to stretch out and draw back in a hydraulic driving mode, so that the support section can be driven to retract through a hydraulic system under the condition that the cold and hot pilger rolled pipe blank is difficult to strip without influencing the normal work of a main rolling mill, and the smooth stripping is realized;
2. the invention can stretch out and draw back the supporting section, adjust the length of the supporting section to a certain extent, and improve the yield by changing the length of the supporting section according to the requirements of the actual production process, such as under the condition of changing the parameters of the material, the size and the like of the tube blank;
drawings
FIG. 1 is a schematic diagram of the present invention without hydraulic control;
FIG. 2 is a schematic diagram of the hydraulic control of the present invention;
in the figure, a capillary tube section-1, a transition section-2, a support section-3, a threaded connecting block-4, an oil return cavity-5, an oil inlet cavity-6, an oil inlet tube-7, an oil return tube-8, a three-position four-way reversing valve-9, an overflow valve-10, a hydraulic pump-11, an oil tank-12, a limiting boss-13, a connecting rod-14, a limiting block-15, an oil return channel-16, an oil inlet channel-17 and a switch valve-18.
Detailed Description
In order to further illustrate the technical solution of the present invention, the present invention is further illustrated by the following examples.
As shown in fig. 1 and 2, a telescopic pilger mandrel comprises a capillary section 1, a transition section 2 and a support section 3, wherein the transition section 2 is composed of a connection section and a deformation section, the connection section is cylindrical, the diameter of the connection section is the same as that of the capillary section 1, the deformation section is arc-shaped and has the same shape as that of a roll groove, a threaded connection block 4 is arranged at the left end of the capillary section 1, an oil return cavity 5 is arranged on the right end face of the transition section 2, the threaded connection block 4 is in threaded connection with the oil return cavity 5, an oil inlet cavity 6 is arranged on the left end face of the transition section 2, the oil inlet cavity 6 is communicated with the oil return cavity 5, a limit boss 13 is arranged between the oil inlet cavity 6 and the oil return cavity 5, the right end of the support section 3 is arranged in the oil inlet cavity 6, and the inner diameter of the oil inlet cavity 6 is the same as that of the support section 3, the outer surface of the supporting section 3 is plated with a hard alloy layer, the right end of the supporting section 3 is connected with a limiting block 15 through a connecting rod 14, the limiting block 15 is positioned in the oil return cavity 5, the diameter of the limiting block 15 is the same as the inner diameter of the oil return cavity 5, an oil return channel 16 communicated with the oil return cavity 5 is arranged on the capillary tube section 1, an oil inlet channel 17 communicated with the oil inlet cavity 6 is arranged on the support section 3, the outer ends of the oil return channel 16 and the oil inlet channel 17 are respectively provided with a switch valve 18, the oil inlet channel 17 and the oil return channel 16 are respectively connected with a three-position four-way reversing valve 9 through an oil inlet pipe 7 and an oil return pipe 8, the three-position four-way reversing valve 9 is connected with a hydraulic pump 11 through a pipeline, the hydraulic pump 11 is connected with an oil tank 12 through a pipeline, and an overflow valve 10 is arranged between the three-position four-way reversing valve 9 and the hydraulic pump 11.
While there have been shown and described what are at present considered to be the essential features and advantages of the invention, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. A retractable pilger mandrel, characterized in that: comprises a capillary tube section (1), a transition section (2) and a supporting section (3), wherein a threaded connecting block (4) is arranged at the left end of the capillary tube section (1), an oil return cavity (5) is formed in the right end face of the transition section (2), the threaded connecting block (4) is in threaded connection with the oil return cavity (5), an oil inlet cavity (6) is formed in the left end face of the transition section (2), the oil inlet cavity (6) is communicated with the oil return cavity (5), a limiting boss (13) is arranged between the oil inlet cavity (6) and the oil return cavity (5), the right end of the supporting section (3) is arranged in the oil inlet cavity (6), the inner diameter of the oil inlet cavity (6) is the same as the diameter of the supporting section (3), the right end of the supporting section (3) is connected with a limiting block (15) through a connecting rod (14), and the limiting block (15) is positioned in the oil return cavity (5), the diameter of stopper (15) is the same with the internal diameter that returns oil chamber (5) be provided with return oil passageway (16) with returning oil chamber (5) intercommunication on capillary section (1) be provided with oil feed passageway (17) with oil feed chamber (6) intercommunication on support section (3) the outer end of oil return passageway (16) and oil feed passageway (17) all is provided with switch valve (18), oil feed passageway (17) and oil return passageway (16) are connected with tribit four-way reversing valve (9) through advancing oil pipe (7) and returning oil pipe (8) respectively, tribit four-way reversing valve (9) are connected with hydraulic pump (11) through the pipeline, hydraulic pump (11) are connected with oil tank (12) through the pipeline be provided with overflow valve (10) between tribit four-way reversing valve (9) and hydraulic pump (11).
2. A telescopic pilger mandrel as claimed in claim 1, wherein: the transition section (2) is composed of a connecting section and a deformation section, the connecting section is cylindrical, the diameter of the connecting section is the same as that of the tubular billet section (1), and the deformation section is arc-shaped and has the shape the same as that of a pass of a roller groove.
3. A telescopic pilger mandrel as claimed in claim 1, wherein: the outer surface of the support section (3) is plated with a hard alloy layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010990855.9A CN114247754A (en) | 2020-09-19 | 2020-09-19 | Telescopic pilger core rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010990855.9A CN114247754A (en) | 2020-09-19 | 2020-09-19 | Telescopic pilger core rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114247754A true CN114247754A (en) | 2022-03-29 |
Family
ID=80788139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010990855.9A Pending CN114247754A (en) | 2020-09-19 | 2020-09-19 | Telescopic pilger core rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114247754A (en) |
-
2020
- 2020-09-19 CN CN202010990855.9A patent/CN114247754A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20220329 |
|
| WD01 | Invention patent application deemed withdrawn after publication |