CN208321615U - A kind of self-centering core pin of seamless steel pipe - Google Patents
A kind of self-centering core pin of seamless steel pipe Download PDFInfo
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- CN208321615U CN208321615U CN201820930914.1U CN201820930914U CN208321615U CN 208321615 U CN208321615 U CN 208321615U CN 201820930914 U CN201820930914 U CN 201820930914U CN 208321615 U CN208321615 U CN 208321615U
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- concave ring
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Abstract
The utility model relates to arrive a kind of self-centering core pin of seamless steel pipe, including bar body, bar body front end is coaxially connected with top, cooling main pipeline is axially provided in the bar body, the cooling concave ring of multiple tracks is disposed with along its axial direction in bar body, multiple cooling holes being connected to cooling main pipeline are circumferentially evenly equipped on the cooling concave ring of per pass, the aperture of each cooling hole is consistent.By the way that cooling concave ring is arranged in bar body, and multiple cooling holes being connected to cooling main pipeline are circumferentially evenly equipped on the cooling concave ring of per pass, the aperture of each cooling hole is consistent, it, can be by cooling hole spray cooling liquid, since the aperture of each cooling hole is consistent in this way in perforation procedure, therefore the pressure of coolant liquid is also consistent, when coolant liquid is injected on hollow billet inner wall, the reaction force of coolant liquid makes the rotation of bar body tend towards stability, and reduces the amplitude of swing or off-axis.
Description
Technical field:
The utility model relates to a kind of self-centering core pins of seamless steel pipe.
Background technique:
Need to use various production equipments in the production process of seamless steel pipe, punch is exactly to produce seamless steel pipe equipment
In highly important one kind.Effect of the punch in seamless steel tube production unit is by solid blank pierced billet into hollow hollow billet.
Perforation procedure is rotated by piercer roll, and mandrel trolley drives top, core bar to run to working position, and in the position by core bar
Trolley locking, the pipe heated are pushed into punch main engine bed by blank pushing machine, and pipe bites, perforates, after rolling, locking dress
Opening is set, and mandrel trolley moves to rear position, hollow billet and top is separated by de- pipe device.
For existing piercing mill of seamless steel tube in perforation procedure, core pin front end only relies on pipe and roll positioning, is wearing
When vent stem high speed rotation, due to the presence of inertia, core pin will appear swing or off-axis, when there is dancing
When, the internal diameter of hollow billet can be expanded, while deepening the spiral thread of hollow billet inner wall, subsequent cold-drawing technology is made to be affected, and work as and wear
When vent stem off-axis, it will cause hollow billet wall unevenness phenomenons.
Utility model content:
The technical problem to be solved by the utility model is to provide a kind of self-centering core pins of seamless steel pipe.
In order to solve the above technical problems, the technical solution adopted in the utility model is: a kind of self-centering perforation of seamless steel pipe
Bar, including bar body, bar body front end are coaxially connected with top, cooling main pipeline, bar sheet are axially provided in the bar body
Be disposed with the cooling concave ring of multiple tracks along its axial direction on body, be circumferentially evenly equipped on the cooling concave ring of per pass it is multiple with cool down what main pipeline was connected to
The aperture of cooling hole, each cooling hole is consistent.
As a preferred embodiment, the top is internally provided with cavity, and cavity is connected to cooling main pipeline, comes directly towards front end
It is opened up on tapered surface there are three spray hole extending obliquely forward, three spray holes are circumferentially evenly arranged on the front end tapered surface of top.
As a preferred embodiment, three diversion trenches are offered on the top outer wall, three diversion trenches are circumferentially distributed in
On top, three diversion trenches collect in top front end, and three spray holes are provided with correspondingly in three diversion trenches.
The beneficial effects of the utility model are: by the way that cooling concave ring is arranged in bar body, and in the cooling concave ring of per pass
Upper circumferential direction is evenly equipped with multiple cooling holes being connected to cooling main pipeline, and the aperture of each cooling hole is consistent, in this way in perforation procedure,
Can be by cooling hole spray cooling liquid, since the aperture of each cooling hole is consistent, the pressure of coolant liquid is also consistent, works as cooling
When liquid is injected on hollow billet inner wall, the reaction force of coolant liquid makes the rotation of bar body tend towards stability, and reduces swing or off-axis
The amplitude of line.
Detailed description of the invention:
Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawing, in which:
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the right view of Fig. 1.
In Fig. 1 and Fig. 2: 1, bar body, 2, top, 3, cooling main pipeline, 4, cooling concave ring, 5, cooling hole, 6, cavity, 7,
Spray hole, 8, diversion trench.
Specific embodiment:
With reference to the accompanying drawing, the specific embodiment of the utility model is described in detail.
As depicted in figs. 1 and 2, the self-centering core pin of a kind of seamless steel pipe, including bar body 1,1 front end of bar body coaxially connect
It is connected to top 2, cooling main pipeline 3 is axially provided in the bar body 1, multiple tracks is disposed with along its axial direction in bar body 1 and cools down
Concave ring 4, per pass, which cools down, is circumferentially evenly equipped with multiple cooling holes 5 being connected to cooling main pipeline 3, the aperture of each cooling hole 5 on concave ring 4
Unanimously.
By the way that cooling concave ring 4 is arranged in bar body 1, and be circumferentially evenly equipped on the cooling concave ring 4 of per pass it is multiple with it is cold
But the cooling hole 5 that main pipeline 3 is connected to, the aperture of each cooling hole 5 is consistent, in this way in perforation procedure, can be sprayed by cooling hole 5
Coolant liquid is penetrated, since the aperture of each cooling hole 5 is consistent, the pressure of coolant liquid is also consistent, when coolant liquid is injected in hollow billet
When on wall, the reaction force of coolant liquid makes the rotation of bar body 1 tend towards stability, and reduces the amplitude of swing or off-axis.
Meanwhile coolant liquid can be such that hollow billet inner wall is quickly cooled down, hardness fast lifting, such bar body 1 is threaded through hollow billet
It is interior, increased by hollow billet inner wall restraining force, also further limits the swing or off-axis phenomenon of core pin.
The top 2 is internally provided with cavity 6, and cavity 6 is connected to cooling main pipeline 3, comes directly towards and opens up on 2 front end tapered surfaces
There are three spray hole 7 extending obliquely forward, on the circumferential front end tapered surface for being evenly arranged on top 2 of three spray hole 7.
Spray hole 7 can spray coolant liquid in perforation procedure, and when core pin and roll are axially consistent, hollow billet tube wall is equal
Even, coolant liquid is also synchronous to the cooling of hollow billet tube wall, and when core pin off-axis, then hollow billet pipe thickness is uneven,
There is thickness to have thin, thicker side cooling velocity is slower, and relatively thin side cooling velocity is fast, then will appear relatively thin side tube wall ratio
It is big compared with the tube wall hardness of thick side, at this moment, then by the jet power of coolant liquid, gradually make top 2 as the softer side of tube wall is entangled
Partially, heart function is made by oneself to realize.
Three diversion trenches 8 are offered on 2 outer walls of the top, three diversion trenches 8 are circumferential to be distributed on top 2, and three are led
Chute 8 collects in 2 front ends of top, and three spray holes 7 are provided with correspondingly in three diversion trenches 8.
After the cooling liquid part gasification that spray hole 7 sprays, higher air pressure is formed in three diversion trenches 8, due to three
Diversion trench communicates, therefore the air pressure in three diversion trenches 8 is equal, after hollow billet inner wall cooling meat, hyperbar compacting top 2
So that its rotation is tended towards stability, reduces amplitude of fluctuation.
The principles and effects of the invention, and the embodiment that part uses only is illustrated in above-described embodiment,
And is not intended to limit the present invention；It should be pointed out that for those of ordinary skill in the art, not departing from the invention structure
Under the premise of think of, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Claims (3)
1. a kind of self-centering core pin of seamless steel pipe, including bar body (1), bar body (1) front end is coaxially connected with top (2),
It is disposed with it is characterized in that, be axially provided with cooling main pipeline (3) in the bar body (1), in bar body (1) along its axial direction more
Road is cooling concave ring (4), and multiple cooling holes (5) being connected to cooling main pipeline (3) are circumferentially evenly equipped on per pass cooling concave ring (4),
The aperture of each cooling hole (5) is consistent.
2. the self-centering core pin of a kind of seamless steel pipe according to claim 1, which is characterized in that the top (2) is internal
It is provided with cavity (6), cavity (6) is connected to cooling main pipeline (3), is come directly towards and is tilted towards there are three opening up on the tapered surface of (2) front end
The spray hole (7) of preceding extension, three spray holes (7) are circumferentially evenly arranged on the front end tapered surface of top (2).
3. the self-centering core pin of a kind of seamless steel pipe according to claim 2, which is characterized in that described top (2) outer wall
On offer three diversion trenches (8), three diversion trenches (8) are circumferentially distributed on top (2), and three diversion trenches (8) are in top (2)
Front end is collected, and three spray holes (7) are provided with correspondingly in three diversion trenches (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820930914.1U CN208321615U (en) | 2018-06-19 | 2018-06-19 | A kind of self-centering core pin of seamless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820930914.1U CN208321615U (en) | 2018-06-19 | 2018-06-19 | A kind of self-centering core pin of seamless steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208321615U true CN208321615U (en) | 2019-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820930914.1U Active CN208321615U (en) | 2018-06-19 | 2018-06-19 | A kind of self-centering core pin of seamless steel pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110153190A (en) * | 2019-06-13 | 2019-08-23 | 南通市嘉业机械制造有限公司 | A kind of high stable piercing plug for seamless steel tubes |
-
2018
- 2018-06-19 CN CN201820930914.1U patent/CN208321615U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110153190A (en) * | 2019-06-13 | 2019-08-23 | 南通市嘉业机械制造有限公司 | A kind of high stable piercing plug for seamless steel tubes |
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