CN213436317U - Novel blank - Google Patents
Novel blank Download PDFInfo
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- CN213436317U CN213436317U CN202021981800.3U CN202021981800U CN213436317U CN 213436317 U CN213436317 U CN 213436317U CN 202021981800 U CN202021981800 U CN 202021981800U CN 213436317 U CN213436317 U CN 213436317U
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Abstract
The utility model provides a novel blank, its characterized in that: one end of the blank is a biting end, and the other end of the blank is a feeding end; a conical groove for inserting the top head is formed on the biting end; a through hole for punching is formed on the feeding end; the inner cavity of the through hole is communicated with the inner cavity of the conical groove; the through hole is connected with the conical groove through an arc. The utility model discloses a mode of machine tooling is to blank processing, but makes blank internal surface smooth transition, can not have the step, can reduce the damage of rolling in-process blank metal to the top surface, has improved hollow billet internal surface quality.
Description
Technical Field
The utility model relates to a novel blank, mainly used high alloy seamless pipe's production.
Background
The steel tube factory can produce medium and thick wall seamless steel tubes of carbon steel, low alloy steel, medium alloy steel, high alloy steel and the like by using a rolling mill set. The billet (generally solid) needs to be shaped in the piercing process, i.e. the rolling section is circular. The equipment adopted by the steel pipe factory is a two-roller skew rolling puncher, conical rollers are used, round billets are used as blanks, and a universal bullet head type top head is used.
When a high alloy steel (generally, alloy mass percent is more than or equal to 5%) seamless steel tube is produced, in order to ensure that better material structure and performance requirements of finished products are obtained, the rolling temperature is required to be controlled at low temperature (the material temperature generally requires about 1190 ℃), meanwhile, because of the material characteristics of the high alloy steel, the high alloy steel has higher strength than that of the common alloy steel, the deformation resistance in the rolling process is large, and the front clamping caused by the unsmooth secondary biting of blanks is easy to occur in the punching process, so that the blanks are scrapped, and the blanks are clamped in a puncher to cause production interruption. At present, the production of high alloy steel generally adopts a method of pretreating a blank with a full-length through hole to reduce the deformation resistance of the blank in a biting stage and the axial deformation resistance of the whole rolling process, and a puncher adopts a molybdenum-based plug (preheating the molybdenum-based plug before punching) during production.
With the increase of the content of high alloy steel alloy (the mass percent of the alloy is more than or equal to 20%) and the characteristics of steel grades with different components, the lower rolling temperature (the material temperature is less than or equal to 1180 ℃) is required to be controlled, the deformation resistance in the perforating process is further increased, the loss of the molybdenum-based plug is increased, and even a through hole blank can not be bitten smoothly.
SUMMERY OF THE UTILITY MODEL
The inventor finds that, for the blank pretreatment method, if the conventional method is adopted to modify the puncher matched with the blank pretreatment method, the technical bottlenecks in the following aspects exist, specifically: 1) the equipment has a complex structure, belongs to the proprietary technology of equipment suppliers, and has no technical improvement capability; 2) at present, the applicant does not have matched molybdenum-based plug preheating equipment, the existing equipment design cannot meet the loading and unloading requirements of the preheating plug, the existing equipment site setting limitation and the equipment itself do not have the equipment improvement technical capability, and the molybdenum-based plug cannot be used; 3) in contrast, the novel blank pretreatment method can be redesigned to meet the use requirement. But there are several limitations that prevail: a) obvious steps cannot be formed between the tapered groove machined at the biting end of the blank and the original through hole end of the blank, and if the steps exist, the defects of folding or cracking and the like exist on the inner wall of the perforated capillary tube, so that the quality of the inner surface is influenced; b) under the condition that other parameters are not changed, when a common forging top head is used, the surface of the top head is scraped to cause the rejection of the top head due to the shape of a tapered groove machined at a blank biting end and the surface quality of the groove wall; c) when the blank is pierced and rolled, the space between the blank and the plug is increased when the metal enters the deformation zone (after the primary biting), so that the blank has enough time to complete at least one circle of rotation before contacting the plug to obtain enough axial pushing force, thereby improving the secondary biting of the blank and successfully completing the piercing and rolling of the blank.
From the above analysis, it was determined that solving the bite problem for high alloy billets had to be undertaken from billet preparation redesign.
Therefore, the inventor develops a novel blank and a pretreatment method thereof through research, and solves the technical problems that the loss of the plug is increased and the through hole blank cannot be smoothly bitten.
In order to achieve the above object, the present invention provides the following technical solutions: the utility model discloses a first aspect provides a novel blank, its characterized in that: one end of the blank is a biting end, and the other end of the blank is a feeding end; a conical groove for inserting the top head is formed on the biting end; a through hole for punching is formed on the feeding end; the inner cavity of the through hole is communicated with the inner cavity of the conical groove; the through hole is connected with the conical groove through an arc.
In the blank as described above, it is preferable that: the axis of the through hole and the axis of the conical groove are the same straight line.
In the blank as described above, it is preferable that: one end of the conical groove and the biting end are on the same horizontal plane, and the other end of the conical groove is connected with the through hole through the circular arc; the diameter of one end of the tapered groove is larger than that of the other end of the tapered groove.
In the blank as described above, it is preferable that: the circle center of the arc is not positioned in a plug cavity formed by the through hole inner cavity and the conical groove inner cavity; the roughness of the conical groove is not more than Ra12.5.
In the blank as described above, it is preferable that: the length range of the blank is 1-8 m; the length range of the tapered groove is 100-400 mm.
In the blank as described above, it is preferable that: the diameter range of one end of the conical groove is 100-500 mm; the ratio of the diameter of the blank to the diameter of one end of the conical groove is 1.2-2.5.
In the blank as described above, it is preferable that: the diameter range of the through hole is 30-300 mm; the ratio of the diameter of the through hole to the diameter of the blank is 0.1-0.25.
In the blank as described above, it is preferable that: the conical angle range of the conical groove is 7-45 degrees; the radius range of the arc is 80-135 mm; the conical angle is an included angle between a generatrix of the conical groove and an extension line of the generatrix of the through hole.
A second aspect of the present invention relates to a method for pretreating the blank material, comprising the steps of; machining the end face of the feeding end of the blank to a part of the area inside the blank by adopting a machining mode to form the through hole based on the first aspect of the utility model; machining the end face of the biting end of the blank to the other part of the area inside the blank by adopting a machining mode to form a conical groove based on the first aspect of the utility model; the through-hole with the mode processing that the junction of bell jar adopted machining is based on the utility model discloses the first aspect the circular arc.
In the above-described billet pretreatment method, preferably, the inner surface of the tapered groove is machined by machining a tapered surface.
The utility model discloses an "adopt two segmentation" structures, do not change the appearance and the size of original blank full length through-hole part, only process the blank and sting the terminal surface and partly regional tapered groove that forms of inside of blank, adopt the slick and sly transition of machining mode between former through-hole part and tip tapered groove in the blank. The inner surface of the area between the end face of the blank biting end and the original through hole of the blank is processed in a mode of processing the conical surface, so that the inner surface of the whole conical groove can be in smooth transition, no step exists, the damage of the blank metal to the surface of the plug in the rolling process can be reduced, and the sufficient length of the end conical groove effectively reduces the deformation resistance of the puncher during secondary biting, reduces the friction stress of the surface of the plug in the blank biting process, reduces the loss of the plug, ensures that the common forged plug can also produce a high-alloy seamless pipe, and effectively reduces the production cost.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged view of a structure of fig. 1 at a part a.
Description of reference numerals: the device comprises a blank 1, a through hole 2, a tapered groove 3, an arc 4, a biting end 5 and a feeding end 6.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Each example is provided by way of explanation of the invention and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected", "connected" and "disposed" used in the present invention should be understood in a broad sense, and may be, for example, either fixedly connected or detachably connected; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
As shown in fig. 1 to 2, according to the embodiment of the present invention, the present invention provides a novel blank, one end of the blank 1 is a biting end 5, and the other end is a feeding end 6; sting and being formed with on the end 5 and being used for top male bell jar 3, be formed with simultaneously on sending into end 6 and be used for fenestrate through-hole 2 to the inner chamber of through-hole 2 is connected with bell jar 3's inner chamber and is communicated with each other, makes the utility model provides a loss of top increases to and the technical problem that the through-hole blank also can't be bitten into smoothly, also make blank 1 when perforating rolling, blank 1 has enough time to accomplish the rotation of at least a week before the contact top and has obtained sufficient axial thrust, bites into with the secondary that improves the blank, accomplishes the perforation rolling of blank smoothly. The through hole 2 is connected with the conical groove 3 through the circular arc 4, so that the joint of the conical groove 3 and the through hole 2 is in gentle transition, no step exists, and the damage of blank metal to the surface of the top in the rolling process can be reduced.
In the embodiment of the present invention, the axis of the through hole 2 and the axis of the conical groove 3 are the same straight line, i.e. the straight line EF in fig. 1, so that the utility model discloses a significant dislocation can not be formed between the conical groove 3 and the through hole 2, and the loss of the plug is also reduced simultaneously.
In the embodiment of the utility model, one end of the conical groove 3 and the biting end 5 are on the same horizontal plane, the other end is connected with the through hole 2 through the circular arc 4, and the diameter of one end of the conical groove 3 is larger than that of the other end of the conical groove 3; so that no obvious step can be formed between the tapered groove 3 and the through hole 2, and the loss of the plug is reduced.
The utility model discloses an in the embodiment, circular arc 4 has following two kinds of circumstances, and the first condition is that the centre of a circle of circular arc 4 is arranged in the top chamber that 2 inner chambers of through-hole and 3 inner chambers of tapered groove are constituteed, and the second condition is that the centre of a circle of circular arc 4 is not arranged in the top chamber that 2 inner chambers of through-hole and 3 inner chambers of tapered groove are constituteed, in this embodiment, the utility model discloses a circular arc 4 preferred choice second condition, under the second condition the utility model discloses a can not form obvious step between tapered groove 3 and the through-hole 2, also reduce the loss of top simultaneously. The roughness of the taper groove 3 is not more than Ra12.5, in this embodiment, the roughness of the taper groove 3 can be set to Ra5 or Ra6 or Ra7 or Ra8 or Ra9 or Ra10 or Ra11 or Ra12 or Ra12.5, so that the utility model discloses under the condition that other parameters are not changed, when using ordinary forging top, the internal surface of taper groove 3 can not cause the top surface scratch to lead, increases the life of top, reduces the loss of top.
In the embodiment of the present invention, the length (L in fig. 1) of the blank 1 ranges from 1 to 8m, in the embodiment, the length (L in fig. 1) of the blank 1 is set to 1m, and in other embodiments, the length (L in fig. 1) of the blank 1 can also be set to 8 m. The length scope of bell jar 3 is 100 ~ 400mm, and in this embodiment, the length of bell jar 3 sets up to 100mm or 400mm, and in other embodiments, the length of bell jar 3 can also set up to 200mm or 300mm, makes the utility model discloses a bell jar has sufficient length, can show to reduce the blank secondary and bite in-process top to the resistance of blank, has effectively reduced the deformation resistance when the piercing mill secondary bites, has reduced the blank and has bitten in-process top surface friction atress, has reduced the top loss for ordinary forging top also can produce high alloy seamless pipe, has effectively reduced manufacturing cost.
In the embodiment of the present invention, the diameter range of one end of the tapered groove 3 is 100-500 mm, in this embodiment, the diameter of one end of the tapered groove 3 (D1 in fig. 1) is set to 100mm, and in other embodiments, the diameter of one end of the tapered groove 3 (D1 in fig. 1) can also be set to 200mm or 300mm or 400mm or 500 mm. The ratio of the diameter of the blank 1 (D2 in FIG. 1) to the diameter of one end of the tapered slot 3 is 1.2-2.5, in this embodiment, the ratio of the diameter of the blank 1 to the diameter of one end of the tapered slot 3 is set to be 1.2, in other embodiments, the ratio of the diameter of the blank 1 to the diameter of one end of the tapered slot 3 can also be set to be 1.3, 1.5, 1.7, 1.9, 2.1, 2.3, or 2.5, so as to ensure that when blanks of different specifications are produced, the blank obtains a sufficient rolling force before contacting the top, which is convenient for the blank to be successfully bitten into for the second time.
In the embodiment of the present invention, the diameter of the through hole 2 ranges from 30mm to 300 mm; in this embodiment, the diameter of the through hole 2 (D3 in FIG. 1) is set to 30mm, and in other embodiments, the diameter of the through hole 2 (D3 in FIG. 1) can also be set to 500mm or 600mm or 800mm or 1000mm or 1200mm or 1400mm or 1600mm or 180mm or 220mm or 240mm or 280mm or 300 mm. The diameter ratio of the through hole 2 to the blank 1 is 0.1-0.25, in the embodiment, the diameter ratio of the through hole 2 to the blank 1 is set to be 0.1, in other embodiments, the diameter ratio of the through hole 2 to the blank 1 can also be set to be 0.15 or 0.2 or 0.25, the through hole 2 can eliminate the defect of a blank core part, the inner surface quality of a finished steel pipe is improved, and the deformation resistance in the blank punching process is reduced.
In the embodiment of the present invention, the taper angle (α in fig. 1) of the tapered groove 3 ranges from 7 ° to 45 °; in this embodiment, the degree of the cone angle may be 9 ° or 11 ° or 15 ° or 17 ° or 20 ° or 22 ° or 24 ° or 26 ° or 28 ° or 30 ° or 33 ° or 35 ° or 37 ° or 41 ° or 43 ° or 45, and the like. The radius range of the circular arc 4 is 80-135 mm, in the embodiment, the radius of the circular arc 4 is set to 80mm, in other embodiments, the radius of the circular arc 4 can also be set to 90mm or 100mm or 110mm or 120mm or 135mm, and the conical angle is an included angle between a generatrix of the conical groove 3 and an extension line of the generatrix of the through hole 2, namely an angle alpha in fig. 1; wherein, the generatrix of the taper groove 3 is a line segment GH in the figure 1, and the generatrix of the through hole 2 is a line segment HJ in the figure 1.
In an embodiment of the present invention, there is provided a blank pretreatment method, including the following steps: step S11: machining the end face of the feeding end 6 of the blank 1 to a part of the area inside the blank 1 by adopting a machining mode to form the through hole 2; step S22: machining the end face of the biting end 5 of the blank 1 to the other part of the area inside the blank 1 by adopting a machining mode to form the tapered groove 3; step S33: the circular arc 4 is machined at the joint of the through hole 2 and the tapered groove 3.
The utility model processes the blank in a machining mode, so that the inner surface of the blank can be in smooth transition without steps, and the damage of the blank metal to the top surface in the rolling process can be reduced; if the step exists, the defects of folding or cracking and the like exist on the inner wall of the perforated capillary, and the quality of the inner surface of the capillary is influenced.
The utility model discloses an in the embodiment, 3 internal surfaces of tapered groove adopt the mode of processing conical surface to process, make 3 internal surfaces of tapered groove smooth, reduce the damage of 3 internal surfaces of tapered groove to the top surface in the rolling process.
The utility model discloses the first novel blank pretreatment method is used for the rolling of high alloy seamless steel pipe. The steel is easy to clamp or cannot be produced when the high alloy steel with the alloy content of more than 20% (the alloy mass percentage is more than or equal to 20%) is punched, the total amount of the high alloy steel pipes is 40 tons every year (2019 data in 460 factories), the profit of each ton of steel is 20.5 ten thousand yuan/ton, and the sales profit is 40 x 20.5 to 820 ten thousand yuan/year; 26.7 ten thousand yuan/ton molybdenum-based plug, 3 ten thousand yuan/ton common forging plug, high alloy contract plug all the year round consumes about 2 tons, use common forging plug production can reduce the cost: (26.7-3) × 2 ═ 47.4 ten thousand yuan, annual efficacy 820+47.4 ═ 867.4 ten thousand yuan.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A novel blank is characterized in that:
one end of the blank is a biting end, and the other end of the blank is a feeding end;
a conical groove for inserting the top head is formed on the biting end;
a through hole for punching is formed on the feeding end;
the inner cavity of the through hole is communicated with the inner cavity of the conical groove;
the through hole is connected with the conical groove through an arc.
2. A blank as claimed in claim 1, wherein:
the axis of the through hole and the axis of the conical groove are the same straight line.
3. A blank as claimed in claim 1, wherein:
one end of the conical groove and the biting end are on the same horizontal plane, and the other end of the conical groove is connected with the through hole through the circular arc;
the diameter of one end of the tapered groove is larger than that of the other end of the tapered groove.
4. A blank as claimed in claim 1, wherein:
the circle center of the arc is not positioned in a plug cavity formed by the through hole inner cavity and the conical groove inner cavity;
the roughness of the conical groove is not more than Ra12.5.
5. A blank as claimed in claim 1, wherein:
the length range of the blank is 1-8 m;
the length range of the tapered groove is 100-400 mm.
6. A blank as claimed in claim 3, wherein:
the diameter range of one end of the conical groove is 100-500 mm;
the ratio of the diameter of the blank to the diameter of one end of the conical groove is 1.2-2.5.
7. A blank as claimed in claim 1, wherein:
the diameter range of the through hole is 30-300 mm;
the ratio of the diameter of the through hole to the diameter of the blank is 0.1-0.25.
8. A blank as claimed in claim 1, wherein:
the conical angle range of the conical groove is 7-45 degrees;
the radius range of the arc is 80-135 mm;
the conical angle is an included angle between a generatrix of the conical groove and an extension line of the generatrix of the through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021981800.3U CN213436317U (en) | 2020-09-11 | 2020-09-11 | Novel blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021981800.3U CN213436317U (en) | 2020-09-11 | 2020-09-11 | Novel blank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213436317U true CN213436317U (en) | 2021-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021981800.3U Active CN213436317U (en) | 2020-09-11 | 2020-09-11 | Novel blank |
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| CN (1) | CN213436317U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112108521A (en) * | 2020-09-11 | 2020-12-22 | 大冶特殊钢有限公司 | Novel blank and pretreatment method thereof |
-
2020
- 2020-09-11 CN CN202021981800.3U patent/CN213436317U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112108521A (en) * | 2020-09-11 | 2020-12-22 | 大冶特殊钢有限公司 | Novel blank and pretreatment method thereof |
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