CN108787753A - Mannesmann piercing mill comes directly towards and Mannesmann piercing mill - Google Patents
Mannesmann piercing mill comes directly towards and Mannesmann piercing mill Download PDFInfo
- Publication number
- CN108787753A CN108787753A CN201810765102.0A CN201810765102A CN108787753A CN 108787753 A CN108787753 A CN 108787753A CN 201810765102 A CN201810765102 A CN 201810765102A CN 108787753 A CN108787753 A CN 108787753A
- Authority
- CN
- China
- Prior art keywords
- piercing mill
- mannesmann piercing
- nose
- section
- interior cold
- 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
- 239000000498 cooling water Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims description 18
- 230000002787 reinforcement Effects 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 10
- 239000010959 steel Substances 0.000 abstract description 10
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 230000035882 stress Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermotherapy And Cooling Therapy Devices (AREA)
Abstract
The present invention provides a kind of Mannesmann piercing mill tops, belong to technical field of ferrous metallurgy, including come directly towards ontology and be arranged intrinsic for accommodating cold cavity in cooling water in top；Top ontology includes nose, the perforated section that is used to connect and smoothly transit with nose, the equal wall section that is used to connect with perforated section and smoothly transit and with inverted cone section that wall section is connected and smoothly transitted；The first end of interior cold cavity extends to top ontology and is located on the end face of one end of inverted cone section, and the second end of interior cold cavity extends to the inside of perforated section；The end face of nose is circular flat, and circular flat is smoothly transitted with perforated section by arc surface and connect.Mannesmann piercing mill uses Mannesmann piercing mill top.Mannesmann piercing mill top provided by the invention and Mannesmann piercing mill, the end face of nose is circular flat, and the thermal capacity of nose is increased under the premise of ensureing thickness of steel pipe precision, nose can be effectively prevent to melt, greatly improve top service life.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, are to be related to a kind of Mannesmann piercing mill top and adopt more specifically
The Mannesmann piercing mill come directly towards with the Mannesmann piercing mill.
Background technology
In oblique milling seamless steel tube production, top is one of maximum main tool and mould of consumption.In perforation procedure, because
It is in direct contact with 1200 DEG C or more of high temperature pipe, and top local environment is the most severe, be subjected to it is huge it is radial, cut
To and roll line direction stress, be also subjected to internal high pressure water cooling and mandril retract after external water cooling caused by
Internal-external temperature difference thermal stress, while also subject to the fatigue stress caused by alternation shearing stress, being pushed up under the complexing action of a variety of stress
Head it is easily cracking, collapse nose the problem of.
Invention content
The purpose of the present invention is to provide a kind of Mannesmann piercing mill tops, it is intended to solve solve tradition top it is easy to crack,
Collapse nose the problem of.
To achieve the above object, the technical solution adopted by the present invention is：A kind of Mannesmann piercing mill top, including top are provided
Head ontology and setting are in the intrinsic interior cold cavity in top；
The top ontology includes nose, the perforated section that is used to connect and smoothly transit with the nose, is used for and described
Perforated section connection and the equal wall section to smoothly transit and the inverted cone section for connecting and smoothly transitting with the equal wall section；
The first end of the interior cold cavity extends to the top ontology and is located at the end face close to one end of the inverted cone section
On, the second end of the interior cold cavity extends to the inside of the perforated section；
The end face of the nose is circular flat, and the circular flat is smoothly transitted company by arc surface and the perforated section
It connects.
Further, at the second end of the interior cold cavity be equipped with for be connected to the interior cold cavity and along the top
The reinforcement cooling hole of the axis direction setting of head ontology.
Further, the cooling hole of reinforcing extends to the inside of the perforated section and is arranged with nose location interval.
Further, the interior cold cavity is the conical cavity that busbar is evagination camber line, and the reinforcement cooling hole is located at taper
At the vertex of a cone of chamber.
Further, the cylindrical cavity for being connected to the interior cold cavity is additionally provided at the second end of the interior cold cavity,
The cylindrical cavity extends to the top ontology and is located on the end face of one end of the inverted cone section.
Further, the cross-sectional area of the cylindrical cavity is greater than or equal to the maximum cross-section area of the interior cold cavity.
Further, the 18%~20% of a diameter of pipe diameter of the circular flat.
Further, the axis of the circular flat and the top ontology is vertically arranged.
Further, the top ontology includes the component of following mass percent：
C：0~0.25%, Si：0.20%~0.50%, Mn：0.30%~0.50%, P：0~0.025%, S：0~
0.025%, Cr：1.20%~2.00%, Ni：2.50%~3.50%, Mo：0~0.50%, W：0~0.50%, Fe surpluses.
The advantageous effect of Mannesmann piercing mill top provided by the invention is：Compared with prior art, by that will come directly towards
Ontology is divided into four parts from front to back：Nose, perforated section, equal wall section, inverted cone section, the four portion smooths transition, reduce friction
The end face of resistance, nose is circular flat, and the thermal capacity of nose is increased under the premise of ensureing thickness of steel pipe precision, can be effective
It prevents nose from melting, shortens the maximum distance between nose and interior cold cavity, after being passed through cooling water in cold cavity inside
It can effectively contain that nose local temperature quickly increases, and greatly improves top service life.
The present invention also provides a kind of Mannesmann piercing mill, the Mannesmann piercing mill includes the above-mentioned Mannesmann piercing mill of any one
With top.
The advantageous effect of Mannesmann piercing mill provided by the invention is：It is come directly towards, is reduced by using the Mannesmann piercing mill
The end face of frictional resistance, nose is circular flat, increases the thermal capacity of nose under the premise of ensureing thickness of steel pipe precision,
Nose can be effectively prevent to melt, shorten the maximum distance between nose and interior cold cavity, it is cold by being passed through in cold cavity inside
But it can effectively contain that nose local temperature quickly increases, and greatly improves top service life after water.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description be only the present invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the structural schematic diagram of Mannesmann piercing mill provided in an embodiment of the present invention top.
In figure：1, ontology is come directly towards；11, nose；12, perforated section；13, equal wall section；14, inverted cone section；15, reinforce cooling hole；
16, interior cold cavity；17, cylindrical cavity.
Specific implementation mode
In order to make technical problems, technical solutions and advantages to be solved be more clearly understood, tie below
Accompanying drawings and embodiments are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is not intended to limit the present invention.
It should be noted that when element is referred to as " being fixed on " or " being set to " another element, it can be directly another
On one element or it is connected on another element.When an element is known as " being connected to " another element, it can
To be directly to another element or be indirectly connected on another element.
It is to be appreciated that term " length ", " width ", "upper", "lower", "front", "rear", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is that orientation based on ... shown in the drawings or position are closed
System, is merely for convenience of description of the present invention and simplification of the description, not indicating or implying the indicated device or element must have
Specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
Also referring to Fig. 1, now Mannesmann piercing mill provided by the invention top is illustrated.The Mannesmann piercing mill
It is used to accommodate cold cavity 16 in cooling water with what is be arranged in the ontology 1 of top with top, including top ontology 1；Come directly towards ontology 1
Including nose 11, be used for and nose 11 connection and smoothly transit perforated section 12, be used for and perforated section 12 connection and smoothly transit
Equal wall section 13 and connected with equal wall section 13 and the inverted cone section 14 that smoothly transits；The first end of interior cold cavity 16 extends to top
Ontology 1 is located on the end face of one end of inverted cone section 14, and the second end of interior cold cavity 16 extends to the inside of perforated section 12；Nose
The end face of point 11 is circular flat, and circular flat is smoothly transitted with perforated section 12 by arc surface and connect.
Mannesmann piercing mill top provided by the invention, compared with prior art, is divided from front to back by that will come directly towards ontology 1
For four parts：Nose 11, perforated section 12, equal wall section 13, inverted cone section 14, the four portion smooths transition, reduce frictional resistance, nose
The end face of point 11 is circular flat, and the thermal capacity of nose is increased under the premise of ensureing thickness of steel pipe precision, can be effectively prevent
Nose melts, and can effectively contain 11 part of nose by being passed through after cooling water in cold cavity 16 inside and reinforcement cooling hole 15
Temperature quickly increases, and greatly improves top service life.
Further, referring to Fig. 1, a kind of specific embodiment party come directly towards as Mannesmann piercing mill provided by the invention
Formula is equipped at the second end of interior cold cavity 16 for be connected to interior cold cavity 16 and be arranged along the axis direction for coming directly towards ontology 1
Reinforcement cooling hole 15.Interior cold cavity 16 is similar with external surface shape, is also in bullet-shaped, to improve the cooling at 11 position of nose
Intensity, in inner cavity, the position of face nose 11, which opens up, reinforces cooling hole 15, and reinforcement cooling hole 15 is blind hole, is entered for cooling water
Nose 11 is cooled down.
Further, referring to Fig. 1, a kind of specific embodiment party come directly towards as Mannesmann piercing mill provided by the invention
Formula reinforces cooling hole 15 and extends to the inside of perforated section 12 and be arranged with 11 location interval of nose.It can effectively shorten and nose
11 distance improves cooling efficiency, prevents 11 heating temperature of nose excessively high and melt.
Further, referring to Fig. 1, a kind of specific embodiment party come directly towards as Mannesmann piercing mill provided by the invention
Formula, interior cold cavity 16 are the conical cavity that busbar is evagination camber line, reinforce cooling hole 15 and are located at the vertex of a cone of conical cavity, convenient to add
Work, and positioned at the axial location of nose 11 and perforated section 12, uniformly nose 11 and perforated section 12 can be cooled down.
Further, referring to Fig. 1, a kind of specific embodiment party come directly towards as Mannesmann piercing mill provided by the invention
Formula, the cylindrical cavity 17 for being connected to interior cold cavity 16 is additionally provided at the second end of interior cold cavity 16, and cylindrical cavity 17 extends to top
Head ontology 1 is located on the end face of one end of inverted cone section 14.It is convenient to be installed to top by the way that cylindrical cavity 17 is arranged.
Further, referring to Fig. 1, a kind of specific embodiment party come directly towards as Mannesmann piercing mill provided by the invention
Formula, the cross-sectional area of cylindrical cavity 17 are greater than or equal to the maximum cross-section area of interior cold cavity 16.Facilitate processing and cooling water
Flowing.
Further, referring to Fig. 1, a kind of specific embodiment party come directly towards as Mannesmann piercing mill provided by the invention
Formula, the 18%~20% of a diameter of pipe diameter of circular flat.A kind of thermal capacity at 11 position of method increase nose is provided.
11 position of nose is designed to that one is a diameter ofCircular flat,Size determined by following methods：It is oblique according to two rollers
Punch deformation principle is pricked, after pipe enters punch pass, under compression and the shearing stress effect of reciprocal alternation in pipe
Non-densified regions are formed centrally, the size in the region is about the 15%-20% of pipe diameter, to ensure hollow billet wall thickness accuracy,No
Energy is more than the 20% of pipe diameter, andIt is too small, it is easy the nose 11 that collapses, thereforeThe 18%-20% of pipe diameter is taken to be
Most preferably.Plane determine after, with top 12 curve negotiating rounded corner transition of perforated section, the thermal capacity at 11 position of nose increases
Greatly, under inner cold water continuous action and after punch off under the action of outer cold water, it can effectively contain 11 local temperature of nose
It quickly increases, to solve the problems, such as the nose 11 that collapses.
Further, referring to Fig. 1, a kind of specific embodiment party come directly towards as Mannesmann piercing mill provided by the invention
The axis of formula, circular flat and top ontology 1 is vertically arranged.Ensure that circular flat can be contacted with pipe simultaneously when in use,
The wear extent of nose 11 is reduced, and ensures that hollow billet can be uniformly located at the periphery of top ontology 1 at the time of molding.
Further, a kind of specific implementation mode as Mannesmann piercing mill provided by the invention top comes directly towards ontology 1
Include the component of following mass percent：
C：0~0.25%, Si：0.20%~0.50%, Mn：0.30%~0.50%, P：0~0.025%, S：0~
0.025%, Cr：1.20%~2.00%, Ni：2.50%~3.50%, Mo：0~0.50%, W：0~0.50%, Fe surpluses.
While the material uses Cr-Ni alloys, it is added to Mo and W elements.Mo elements are mainly the heat for improving top
Epistasis makes steel have more stable hardness at high temperature, increases the drag to deformation, cracking, abrasion etc..W is remarkably improved
C in the red hardness and heat resistance, with steel of top forms the wearability that refractory carbides improve top.Addition Mo, W element can have
Effect solves the damage of the forms such as top cracking, steel bonding, and alleviates the damage for 11 form of nose of collapsing to a certain extent.In the material
In, precious metal Ni, Mo, W alloy content are relatively low, and top cost can be effectively controlled while ensureing top performance,
Reach best cost performance.
Mannesmann piercing mill top of the present invention is cooled down in perforation using inner cold water, and punch off top has been retracted with mandril
Increase outer cold water cooling behind beginning position.Top 1 service life of ontology significantly improves, and is specifically shown in Table 1.Mannesmann piercing mill top of the present invention
Head is compared with tradition comes directly towards, and service life significantly improves, and cracking, steel bonding, 11 3 kinds of damage type proportions of nose of collapsing are apparent
It reduces.
Following table is Mannesmann piercing mill of the present invention top and the service condition comparison of tradition top：
The present invention also provides a kind of Mannesmann piercing mill, Mannesmann piercing mill includes the above-mentioned Mannesmann piercing mill top of any one
Head.
Mannesmann piercing mill provided by the invention is divided into four parts from front to back by that will come directly towards ontology 1：Nose 11, perforation
Section 12, equal wall section 13, inverted cone section 14, the four portion smooths transition reduce frictional resistance, and the end face of nose 11 is circular flat
Face reduces the contact area with pipe, and nose 11 can be effectively prevent to melt while ensureing thickness of steel pipe precision, shortened
Maximum distance between nose 11 and interior cold cavity 16, by can effectively contain after being passed through cooling water in cold cavity 16 inside
11 local temperature of nose quickly increases, and greatly improves top service life.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
1. Mannesmann piercing mill comes directly towards, which is characterized in that intrinsic for holding in the top including top ontology and setting
Receive the interior cold cavity of cooling water；
The top ontology includes nose, the perforated section that is used to connect and smoothly transit with the nose, is used for and the perforation
Section connection and the equal wall section to smoothly transit and the inverted cone section for connecting and smoothly transitting with the equal wall section；
The first end of the interior cold cavity extends to the top ontology and is located on the end face of one end of the inverted cone section, institute
The second end for stating interior cold cavity extends to the inside of the perforated section；
The end face of the nose is circular flat, and the circular flat is smoothly transitted with the perforated section by arc surface and connect.
2. Mannesmann piercing mill top as described in claim 1, which is characterized in that be equipped at the second end of the interior cold cavity
Reinforcement cooling hole for axis direction setting being connected to the interior cold cavity and along the top ontology.
3. Mannesmann piercing mill top as claimed in claim 2, which is characterized in that the reinforcement cooling hole extends to described wear
The inside of hole section and with nose location interval be arranged.
4. Mannesmann piercing mill top as claimed in claim 2, which is characterized in that it is outer convex arc that the interior cold cavity, which is busbar,
The conical cavity of line, the reinforcement cooling hole are located at the vertex of a cone of conical cavity.
5. the Mannesmann piercing mill top as described in claim 1-4 any one, which is characterized in that the of the interior cold cavity
It is additionally provided with the cylindrical cavity for being connected to the interior cold cavity at two ends, the cylindrical cavity, which extends to the top ontology and is located at, to be leaned on
On the end face of one end of the nearly inverted cone section.
6. Mannesmann piercing mill as claimed in claim 5 top, which is characterized in that the cross-sectional area of the cylindrical cavity be more than or
Equal to the maximum cross-section area of the interior cold cavity.
7. as described in claim 1-4 any one Mannesmann piercing mill top, which is characterized in that the circular flat it is straight
Diameter is the 18%~20% of pipe diameter.
8. Mannesmann piercing mill top as described in claim 1, which is characterized in that the circular flat and the top ontology
Axis be vertically arranged.
9. Mannesmann piercing mill top as described in claim 1, which is characterized in that the top ontology includes following quality hundred
Divide the component of ratio：
C：0~0.25%, Si：0.20%~0.50%, Mn：0.30%~0.50%, P：0~0.025%, S：0~
0.025%, Cr：1.20%~2.00%, Ni：2.50%~3.50%, Mo：0~0.50%, W：0~0.50%, Fe surpluses.
10. Mannesmann piercing mill, it is characterised in that：Including the Mannesmann piercing mill top described in 1-9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810765102.0A CN108787753A (en) | 2018-07-12 | 2018-07-12 | Mannesmann piercing mill comes directly towards and Mannesmann piercing mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810765102.0A CN108787753A (en) | 2018-07-12 | 2018-07-12 | Mannesmann piercing mill comes directly towards and Mannesmann piercing mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108787753A true CN108787753A (en) | 2018-11-13 |
Family
ID=64075029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810765102.0A Pending CN108787753A (en) | 2018-07-12 | 2018-07-12 | Mannesmann piercing mill comes directly towards and Mannesmann piercing mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108787753A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110116137A (en) * | 2019-06-13 | 2019-08-13 | 南通市嘉业机械制造有限公司 | A kind of piercing plug for seamless steel tubes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2021045C1 (en) * | 1992-10-12 | 1994-10-15 | Уральский научно-исследовательский институт трубной промышленности | Piercing mill mandrel |
| CN101947551A (en) * | 2010-08-18 | 2011-01-19 | 衡阳华菱钢管有限公司 | Plug for large-hole series medium- and thick-wall capillaries |
| CN202824109U (en) * | 2012-09-24 | 2013-03-27 | 聊城鑫鹏源金属制造有限公司 | One time piercing head for universal roll piercing mill |
| CN203591996U (en) * | 2013-10-25 | 2014-05-14 | 江苏南山冶金机械制造有限公司 | Ejector head |
| CN103962379A (en) * | 2013-01-29 | 2014-08-06 | 黄石成大精密机械制造有限公司 | Pressure-equalized piercing point |
| CN204503758U (en) * | 2015-03-16 | 2015-07-29 | 江苏南山冶金机械制造有限公司 | A kind of combined puncturing top |
| CN107824616A (en) * | 2017-11-03 | 2018-03-23 | 于佳 | A kind of perforating head |
-
2018
- 2018-07-12 CN CN201810765102.0A patent/CN108787753A/en active Pending
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|---|---|---|---|---|
| RU2021045C1 (en) * | 1992-10-12 | 1994-10-15 | Уральский научно-исследовательский институт трубной промышленности | Piercing mill mandrel |
| CN101947551A (en) * | 2010-08-18 | 2011-01-19 | 衡阳华菱钢管有限公司 | Plug for large-hole series medium- and thick-wall capillaries |
| CN202824109U (en) * | 2012-09-24 | 2013-03-27 | 聊城鑫鹏源金属制造有限公司 | One time piercing head for universal roll piercing mill |
| CN103962379A (en) * | 2013-01-29 | 2014-08-06 | 黄石成大精密机械制造有限公司 | Pressure-equalized piercing point |
| CN203591996U (en) * | 2013-10-25 | 2014-05-14 | 江苏南山冶金机械制造有限公司 | Ejector head |
| CN204503758U (en) * | 2015-03-16 | 2015-07-29 | 江苏南山冶金机械制造有限公司 | A kind of combined puncturing top |
| CN107824616A (en) * | 2017-11-03 | 2018-03-23 | 于佳 | A kind of perforating head |
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| Title |
|---|
| 冶金部钢铁研究院加工室钢管组: "《钢管生产与研究 第1集》", 31 December 1976 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110116137A (en) * | 2019-06-13 | 2019-08-13 | 南通市嘉业机械制造有限公司 | A kind of piercing plug for seamless steel tubes |
| CN110116137B (en) * | 2019-06-13 | 2024-03-22 | 南通市嘉业机械制造有限公司 | Seamless steel tube perforating plug |
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Application publication date: 20181113 |
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| RJ01 | Rejection of invention patent application after publication |