CN103286133A - Perforated molybdenum piercing head structural member - Google Patents
Perforated molybdenum piercing head structural member Download PDFInfo
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- CN103286133A CN103286133A CN2013102659057A CN201310265905A CN103286133A CN 103286133 A CN103286133 A CN 103286133A CN 2013102659057 A CN2013102659057 A CN 2013102659057A CN 201310265905 A CN201310265905 A CN 201310265905A CN 103286133 A CN103286133 A CN 103286133A
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Abstract
The invention relates to the seamless steel tube production equipment and discloses a perforated molybdenum piercing head structural member. The perforated molybdenum piercing head structural member comprises a piercing head and a connecting joint; the piercing head is formed by a piercing area, a roll-off area and an adhering to round area; the length of the roll-off area is 75 to 90 % length of the piercing area; the connecting joint is in a hollow shape; one end of the connecting joint is a blind hole and a middle section of the connecting joint is provided with steps which are radially provided with cooling water outlet holes; the blind hole end of the connecting joint is in internal thread connection with the piercing head; the other end of the connecting joint is in internal thread connection with a piercing rod; and an inner hole is provided with a cooling pipe. The perforated molybdenum piercing head structural member has the advantages of enabling internal surface quality of a capillary pipe to be good, enabling surface fracturing and surface sticking which are generated on a full molybdenum piercing head to be reduced, improving the service life by four times and greatly decreasing workloads and auxiliary material consumption in artificial polishing and changing.
Description
Technical field
The present invention relates to the seamless steel pipe manufacturing equipment, particularly a kind of perforation molybdenum plug structural member.
Background technology
Fast development along with power industry, boiler industry has proposed requirements at the higher level to used seamless steel pipe with material, because standard ASME SA-213/SA-213M " boiler in 2010 editions " ASME boiler and pressure vessel standard " II roll of material A piece of writing irons that Sinopec publishing house publishes and distributes, superheater and heat exchanger are with seamless ferrite and austenitic alloy steel pipe " the T91 trade mark and ASME SA-335/SA-335M " high temperature with seamless ferritic alloyed steel nominal pipe " P91 trade mark high-strength seamless steel pipe has favorable manufacturability energy and mechanical performance, obtained widely using at boiler industry, exploitation T91 and P91 trade mark seamless steel pipe become a kind of trend of domestic and international seamless steel pipe manufacturer.
The kind of perforating head has much on the market at present, is mainly traditional oxide-film top (20CrNiSiW steel), H13 steel (edge molybdenum, weldering molybdenum, compound) top, full molybdenum plug, existing top 1 ' be shaped as no nose sphere, as shown in Figure 1.Oxide-film top and H13 steel top are applied in carbon steel, low-alloy steel seamless tube blank production field, and full molybdenum plug then uses at steel alloy and stainless seamless tube blank production field.
Because T91 and P91 trade mark steel belong to steel alloy, steel grade intensity height, deformation temperature interval are narrow, and the technological requirement of pipe drilling/rolling can not effectively be satisfied with H13 steel (edge molybdenum, weldering molybdenum, compound) top in traditional oxide-film top (20CrNiSiW steel).Wherein: traditional oxide-film top is in perforation procedure, and a hollow billet can only be worn in each top, if wear more than two, and existing top punch block L
1' head the top layer metal accumulation will occur, subside, ftracture, and causes accidents such as rolling card, bag push rod; H13 steel top series existing top punch block L all occurs in perforation procedure
1The molybdenum post of ' head composite welding comes off, and causes the top to lose efficacy, serious then bag top; Though and but still there is following problem in rolling 80 of present full molybdenum plug average energy in perforation procedure: (1) is because existing top backing district L
2' too short, be coniform, because backing not exclusively causes hollow billet inner surface quality defective, to declare uselessly, lumber recovery is low; (2) cooling water directly contacts full molybdenum plug, and full molybdenum plug easily produces surface checking under anxious heat (during perforation) operating mode of chilling (before and after the perforation), needs often to change; (3) because cooling water directly contacts full molybdenum plug, the sticking iron in existing top 1 ' surface is serious in the rapid heat cycle perforation procedure, the clean drilling/rolling again of reconditioning progressively after the sticking iron in surface occurring, not only staff labor intensity increases, and needing The pre-heat treatment again after the 1 ' surface temperature reduction of existing top, supplementary product onsumption increases.
The problem of above-mentioned existence causes oxide-film, H13 steel, these three kinds tops of full molybdenum to reduce service life, and the artificial frequency of changing increases, Ding Tou consumption height not only, and owing to backing not exclusively causes hollow billet inner surface quality defective, declare useless very highly, the once lumber-preserving rate is low.
Summary of the invention
At the problems referred to above, technical problem to be solved by this invention is by improving the structure of full molybdenum plug, to reduce the product manufacturing defect service life of effectively improving full molybdenum plug, the raising lumber recovery.
For achieving the above object, the present invention takes following technical scheme, a kind of perforation molybdenum plug structural member, it comprises top and jointing, described top is made of punch block, backing district and circle gauging zone, it is characterized in that, the backing section length is 75%～90% of punch block length; Jointing is hollow shape, and an end is blind hole, and the stage casing is provided with step, and the step place radially is provided with the cooling water apopore; Jointing blind hole end is connected with the top internal thread, and the other end is connected with the push rod internal thread, and endoporus arranges cooling water pipe.
The termination that described cooling water pipe puts in jointing is the inclined-plane.
When the present invention uses, at first the top is carried out the The pre-heat treatment on surface, when the seamless circular pipe from stove in rollgang is transferred to perforation foreground blow tank the time, antioxidant glass dust is smeared on the surface, top that preheating is good uniformly, and open inner cooling water water inlet in the piercer roll set of surfaces is disperseed the spray cooling, at this moment the top enters the drilling/rolling distortion that punch begins pipe, thereby realizes this process of seamless circular pipe hollow billet from solid to hollow.
The present invention compared with prior art, its advantage is:
(1) change backing section length and punch block length composition, expand to 75%～90% by existing less than 40%, backing is abundant, has improved the hollow billet inner surface quality, the lumber recovery height;
(2) the directly full molybdenum plug of contact of cooling water has been avoided in jointing one end blind hole design, and resistant to elevated temperatures full molybdenum plug own has been avoided contacting the surface checking that produces because of cooling water behind the perforation procedure rapid heat cycle; Step place, jointing stage casing radially arranges the cooling water apopore, has accelerated the front end cooling, avoids the screw thread of high temperature damage jointing, the service life of having improved the molybdenum plug structural member;
(3) owing to avoided the directly full molybdenum plug of contact of cooling water, in the perforation procedure, the sticking iron in surface, top reduces the corresponding workload that has reduced artificial reconditioning, replacing, and the corresponding supplementary product onsumption that has reduced full molybdenum plug preheating.
Description of drawings
Fig. 1 is the geometrical form schematic diagram of existing full molybdenum plug.
Fig. 2 is that the present invention improves back perforation molybdenum plug structural member structural representation.
Among the figure: 1, top, 2, jointing, 3, cooling water pipe, 4, the cooling water apopore, 5, push rod, L
1, the punch block, L
2, the backing district, L
3, circle gauging zone, 1 ', existing top, L
1', punch block, existing top, L
2', backing district, existing top.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples, referring to Fig. 2, and a kind of perforation molybdenum plug structural member, it comprises top 1 and jointing 2, described top 1 is by punch block L
1, backing district L
2With circle gauging zone L
3Constitute, it is characterized in that backing district L
2Length is punch block L
175%～90% of length; Jointing 2 is hollow shape, and an end is blind hole, and the stage casing is provided with step, and the step place radially is provided with cooling water apopore 4; Jointing 2 blind hole ends are connected with top 1 internal thread, and the other end is connected with push rod 5 internal threads, and endoporus arranges cooling water pipe 3.
The termination that described cooling water pipe 3 puts in jointing 2 is the inclined-plane.
Embodiment 1: the hollow billet of production diameter of phi 78mm, wall thickness 7.25mm, corresponding perforation molybdenum plug structural member is produced as follows:
1) top 1 is that full Mo is made: diameter of phi 59mm, and length is 160mm, than the length lengthening 10mm of existing top;
2) the punch block L of top 1
1Length is decided to be 80mm, backing district L
2Length is decided to be 70mm, backing district L
2Length/punch block L
1Length ratio is 87.5%, circle gauging zone L
3Length is 10mm.Punch block L
1Profile be taper, backing district L
2Profile be cylindric.Comparison diagram 1 comes directly towards 1 punch block L
1Length obviously shortens, and " tripe shape " increased, and has increased the wearing and tearing thickness that comes directly towards 1 top layer virtually, has also obtained increase the service life of top 1 undoubtedly.Backing district L
2Length increases, and the lengthening of length is conducive to the prolongation of table crushing process time in the hollow billet in the drilling/rolling deformation process, and the uniformity that improves hollow billet inner surface quality and wall thickness has been played better action.The big improvement that comes directly towards 1 geometry has obtained beyond thought promising result;
3) improvement of jointing 2 internal structures: jointing 2 blind hole ends are connected with top 1 internal thread, and the other end is connected with push rod 5 internal threads, and endoporus arranges cooling water pipe 3.Jointing 2 is the straight connector of an end band blind hole, and namely jointing 2 does not drill through with top 1 contact jaw reservation 3mm, cecum, and all the other are through hole.The directly full molybdenum plug 1 of contact of cooling water has been avoided in this design, prevents that the rapid heat cycle perforation procedure from producing the be full of cracks on full molybdenum plug surface, improves the sticking iron in surface, top simultaneously.Consider that jointing 2 is concentric reducer, should guarantee section intensity, also will guarantee the cooling of self, its endoporus divides two sections through holes of making different inner diameters, and step place in stage casing radially is provided with cooling water apopore 4, accelerates front end high temperature intensity of cooling, avoids high temperature to damage the screw thread of jointing 2.The distance that cooling water pipe 3 puts in jointing 2 endoporus is 40mm, cools off front end earlier, back cooling push rod 5, and the face foremost that puts in must sawing become the inclined-plane, should guarantee enough inflows, guarantees to have the backwater amount of some again, strengthens flowability.
Embodiment 2:The hollow billet of production diameter of phi 102mm, wall thickness 7.5mm, corresponding perforation molybdenum plug structural member is produced as follows:
1) top 1 is that full Mo is made: diameter of phi 80mm, and length is 190mm, than the length lengthening 10mm of existing top;
2) the punch block L of top 1
1Length is decided to be 100mm, backing district L
2Length is decided to be 75mm, backing district L
2Length/punch block L
1Length ratio is 75%, circle gauging zone L
3Length is 15mm.Punch block L
1Profile be taper, backing district L
2Profile be cylindric;
3) internal structure of jointing 2: jointing 2 is the straight connector of an end band blind hole, and namely jointing 2 does not drill through with top 1 contact jaw reservation 4mm, cecum, and all the other are through hole.Because jointing 2 be concentric reducer, its endoporus divides two sections through holes of making different inner diameters, and step place in stage casing radially is provided with cooling water apopore 4, accelerates the front end high-temperature water and flows out fast, takes away heat, the threaded connection place temperature of reduction jointing 2.The distance that cooling water pipe 3 puts in jointing 2 endoporus is 40mm.The face foremost that puts in is the inclined-plane, has guaranteed existing enough inflows, has guaranteed to have the backwater amount of some again, with cooling push rod 5.
Embodiment 3:The hollow billet of production diameter of phi 170mm, wall thickness 8mm, corresponding perforation molybdenum plug structural member is produced as follows:
1) top 1 is that full Mo is made: diameter of phi 130mm, and length is 270mm, than the length lengthening 20mm of existing top;
2) the punch block L of top 1
1Length is decided to be 131.5mm, backing district L
2Length is decided to be 118.5mm, backing district L
2Length/punch block L
1Length ratio is 90%, circle gauging zone L
3Length is 20mm.Punch block L
1Profile be taper, backing district L
2Profile be cylindric;
3) internal structure of jointing 2: jointing 2 is the straight connector of an end band blind hole, and namely jointing 2 does not drill through with top 1 contact jaw reservation 5mm, cecum, and all the other are through hole.Because jointing 2 be concentric reducer, its endoporus divides two sections through holes of making different inner diameters, and step place in stage casing radially is provided with cooling water apopore 4, accelerates the front end high-temperature water and flows out fast, takes away heat, the threaded connection place temperature of reduction jointing 2.The distance that cooling water pipe 3 puts in jointing 2 endoporus is 40mm.The face foremost that puts in is the inclined-plane, has guaranteed existing enough inflows, has guaranteed to have the backwater amount of some again, with cooling push rod 5.
The actual use of the present invention case, produce T91 or the P1 trade mark hollow billet of Φ 78 * 7.25 at Φ 89 units with the perforation molybdenum plug structural member of Φ 59mm, because the architecture advances of full molybdenum plug structural member, reduce full molybdenum plug and produced the sticking iron of surface checking and surface, rolling 320 of full molybdenum plug average energy in perforation procedure improves 4 times of service lifes, and the hollow billet inner surface quality is good, the once lumber-preserving rate improves 40%, and production efficiency improves greatly.620 hollow billets are produced in per tour, and full molybdenum plug consumption is reduced to 1.5 by original 6, has reduced the workload of artificial reconditioning, replacing significantly, and corresponding the minimizing significantly comes directly towards the supplementary product onsumption that 1 usefulness oxygen, acetylene heat.
The present invention is by improving contour structures and the jointing structure of perforation molybdenum plug structural member top 1, the cost of seamless steel pipe manufacturing is reduced significantly, inner surface quality is stablized good, not only reduces personnel labor, and has improved greatly and come directly towards 1 cost performance.
Claims (2)
1. perforation molybdenum plug structural member, it comprises top and jointing, and described top is made of punch block, backing district and circle gauging zone, it is characterized in that, and the backing section length is 75%～90% of punch block length; Jointing is hollow shape, and an end is blind hole, and the stage casing is provided with step, and the step place radially is provided with the cooling water apopore; Jointing blind hole end is connected with the top internal thread, and the other end is connected with the push rod internal thread, and endoporus arranges cooling water pipe.
2. a kind of perforation molybdenum plug structural member according to claim 1 is characterized in that, the termination that described cooling water pipe puts in jointing is the inclined-plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102659057A CN103286133A (en) | 2013-06-28 | 2013-06-28 | Perforated molybdenum piercing head structural member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102659057A CN103286133A (en) | 2013-06-28 | 2013-06-28 | Perforated molybdenum piercing head structural member |
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| Publication Number | Publication Date |
|---|---|
| CN103286133A true CN103286133A (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102659057A Pending CN103286133A (en) | 2013-06-28 | 2013-06-28 | Perforated molybdenum piercing head structural member |
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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 |
| CN112676350A (en) * | 2020-12-23 | 2021-04-20 | 大冶特殊钢有限公司 | Ejector rod for perforation and preparation method of ejector rod |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06210321A (en) * | 1993-01-14 | 1994-08-02 | Nkk Corp | Plug for rolling seamless steel tube with descaling brush |
| CN201470677U (en) * | 2009-09-01 | 2010-05-19 | 宜兴市和平冷拔模具有限公司 | Composite piercing plug |
| CN102247990A (en) * | 2011-05-27 | 2011-11-23 | 江苏武进不锈钢管厂集团有限公司 | Molybdenum-based tappet |
| CN102463261A (en) * | 2010-11-19 | 2012-05-23 | 无锡市晟元金属制品有限公司 | Piercing plug |
| CN203437410U (en) * | 2013-06-28 | 2014-02-19 | 新余钢铁集团有限公司 | Perforated molybdenum piercing mandrel structural assembly |
-
2013
- 2013-06-28 CN CN2013102659057A patent/CN103286133A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06210321A (en) * | 1993-01-14 | 1994-08-02 | Nkk Corp | Plug for rolling seamless steel tube with descaling brush |
| CN201470677U (en) * | 2009-09-01 | 2010-05-19 | 宜兴市和平冷拔模具有限公司 | Composite piercing plug |
| CN102463261A (en) * | 2010-11-19 | 2012-05-23 | 无锡市晟元金属制品有限公司 | Piercing plug |
| CN102247990A (en) * | 2011-05-27 | 2011-11-23 | 江苏武进不锈钢管厂集团有限公司 | Molybdenum-based tappet |
| CN203437410U (en) * | 2013-06-28 | 2014-02-19 | 新余钢铁集团有限公司 | Perforated molybdenum piercing mandrel structural assembly |
Cited By (3)
| 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 |
| CN112676350A (en) * | 2020-12-23 | 2021-04-20 | 大冶特殊钢有限公司 | Ejector rod for perforation and preparation method of ejector rod |
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Application publication date: 20130911 |