CN113102545A - Production process of inner diameter protection type hot-rolled seamless steel tube - Google Patents
Production process of inner diameter protection type hot-rolled seamless steel tube Download PDFInfo
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- CN113102545A CN113102545A CN202110187008.3A CN202110187008A CN113102545A CN 113102545 A CN113102545 A CN 113102545A CN 202110187008 A CN202110187008 A CN 202110187008A CN 113102545 A CN113102545 A CN 113102545A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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Abstract
The invention discloses a production process of an inner diameter protection type hot-rolled seamless steel tube, belonging to the field of seamless steel tubes, and the production process of the inner diameter protection type hot-rolled seamless steel tube comprises the following steps: pretreating a tube blank; preparing a core rod; perforating; separating the core rod; tube rolling: reheating; determining (reducing) the diameter; cooling and separating; straightening and cutting; and (2) inspecting and warehousing, wherein an auxiliary support structure is bonded at the rear end of the mandrel, so that when the mandrel is used for perforating the tube blank, the auxiliary support structure expands under the influence of the heat of the tube blank and is supported on the inner side of the tube blank to support the inner diameter of the tube blank, so that the inner diameter of the pipeline is effectively supported in the tube rolling and diameter fixing (reducing) processes, the roundness of the inner diameter is improved, the deformation of the inner diameter in the production process is reduced, the production quality of the hot-rolled seamless steel tube is improved, the mandrel can be taken out by using a perforating machine after perforation, the subsequent rod removing process is effectively reduced, the equipment investment is reduced, and the production cost is reduced.
Description
Technical Field
The invention relates to the field of seamless steel pipes, in particular to a production process of an inner diameter protection type hot-rolled seamless steel pipe.
Background
Seamless steel pipes are steel pipes which are punched by a whole round steel and have no welding seams on the surface, and are called seamless steel pipes. The seamless steel pipe may be hot-rolled, cold-drawn, extruded, pipe-jacked, etc., depending on the production method. The seamless steel pipe is divided into a round shape and a special shape according to the shape of a section, and the special-shaped pipe has various complex shapes such as a square shape, an oval shape, a triangular shape, a hexagonal shape, a melon seed shape, a star shape and a pipe with fins. The maximum diameter is up to 900mm and the minimum diameter is 4 mm. Depending on the application, there are thick-walled seamless steel pipes and thin-walled seamless steel pipes. The seamless steel pipe is mainly used as a petroleum geology drill pipe, a cracking pipe, a boiler pipe and a bearing pipe for petrochemical industry, and a high-precision structural steel pipe for automobiles, tractors and aviation.
Hot rolling the seamless steel pipe: hot rolling is a rolling performed at a recrystallization temperature or lower, as compared with cold rolling, which is a rolling performed at a recrystallization temperature or higher. The hot rolling seamless steel pipe can destroy the casting structure of steel ingots, refine the crystal grains of steel and eliminate the defect of microscopic structure, thereby leading the steel structure to be compact and improving the mechanical property. The improvement is mainly achieved in the rolling direction, so that the steel is no longer isotropic to some extent; bubbles, cracks and porosity formed during casting can also be welded under the action of high temperature and pressure.
The existing production process of hot-rolled seamless steel tubes is perforation → tube rolling → diameter fixing (reducing), after a blank is perforated by using a mandrel, the mandrel can carry out a rolling process along with a hollow billet, the wall thickness of a pipeline is reduced, the mandrel needs to be pulled away after rolling is finished, then the diameter fixing (reducing) process is carried out, the outer diameter of a pierced billet is rounded, and the roundness of the outer diameter of the pipeline is improved.
Disclosure of Invention
1. Technical problem to be solved
In view of the problems in the prior art, an object of the present invention is to provide a process for producing an inner diameter protective hot-rolled seamless steel tube, in which an auxiliary support structure is bonded to the rear end of a mandrel, so that when the mandrel is used to pierce a tube blank, the auxiliary support structure expands due to the heat of the tube blank and is supported on the inner side of the tube blank to support the inner diameter of the tube blank, thereby effectively supporting the inner diameter of the tube during tube rolling and diameter fixing (reducing) processes, improving the roundness of the inner diameter, reducing the deformation of the tube during production, improving the production quality of the hot-rolled seamless steel tube, and taking out the mandrel by using a piercing machine after piercing, effectively reducing the subsequent rod-stripping processes, reducing the equipment investment, and reducing the production cost.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A production process of an inner diameter protection type hot-rolled seamless steel pipe comprises the following steps:
s1, preprocessing a pipe blank: cutting and heating the qualified tube blank;
s2, core rod preparation: the rear end of the core rod is bonded with an auxiliary supporting structure by hot-melt glue to form a protective core rod;
s3, perforating: conveying the heated pipe blank to a perforating machine, and perforating the pipe blank by using a protective mandrel;
s4, mandrel separation: after the mandrel completely penetrates through the tube blank, the auxiliary supporting structure is separated from the mandrel due to thermal deformation of the auxiliary supporting structure, and the auxiliary supporting structure is supported at the inner hole of the tube blank;
s5, pipe rolling: the method comprises the following steps of conveying a tubular billet with an auxiliary supporting structure to a tube rolling mill, reducing the wall thickness of the tubular billet, supporting the inner diameter of the tubular billet by the auxiliary supporting structure, reducing the deformation of the tubular billet, and forming a pierced billet;
s6, reheating: conveying the pierced billets to auxiliary heating equipment for reheating treatment;
s7, diameter determination (reduction): conveying the reheated pierced billet into a diameter fixing (reducing) machine to round the outer diameter of the pierced billet, and enabling an auxiliary support structure to continuously support the inner diameter;
s8, cooling and separating: conveying the rounded pipeline into a cooling separation line to cool the pipeline, enabling an auxiliary supporting structure to be cooled and contracted, separating the pipeline, and recycling the auxiliary supporting structure;
s9, straightening and cutting: moving the cooled pipeline to a straightening device for straightening, and cutting off two ends of the pipeline by a cutting machine to obtain a hot-rolled seamless steel pipe;
s10, inspecting and warehousing: and (4) inspecting and detecting the processed hot-rolled seamless steel pipe, and warehousing and storing the qualified hot-rolled seamless steel pipe. The auxiliary support structure is bonded at the rear end of the mandrel, so that when the mandrel is used for perforating a pipe blank, the auxiliary support structure expands under the influence of the heat of the pipe blank and is supported on the inner side of the pipe blank to support the inner diameter of the pipe blank, the inner diameter of a pipeline is effectively supported in the pipe rolling and diameter fixing (reducing) processes, the roundness of the inner diameter is improved, the deformation of the pipe blank in the production process is reduced, the production quality of a hot-rolled seamless steel pipe is improved, the mandrel can be taken out by using a perforating machine after perforation, the subsequent bar stripping process is effectively reduced, the investment of equipment is reduced, and the production cost is reduced.
Further, the plug including the plug cylinder, with plug cylinder right-hand member fixed connection's direction centrum and with plug cylinder left end fixed connection's connecting rod, supplementary bearing structure is including heat sensitivity sleeve pipe and heat conduction scroll cover, plug cylinder outer end cover is equipped with stable form inlayer pipe, stable form inlayer pipe outer end cover is equipped with heat conduction scroll cover, heat conduction scroll cover outer end cover is equipped with heat sensitivity sleeve pipe, the equal fixedly connected with location platform in both ends about the heat sensitivity sleeve pipe, location platform and the equal fixed connection of heat conduction scroll cover and stable form inlayer pipe are located the right side the location platform bonds with the plug cylinder, the heat sensitivity sleeve pipe is the frustum body, and the minor diameter end is located the right side. The heat-sensitive sleeve, the positioning table and the heat-conducting spiral sleeve are expanded by the heat of the tube blank, so that the volume of the heat-sensitive sleeve is increased, the heat-sensitive sleeve is in contact with the inner wall of a pipeline, the stable inner-layer tube supports the heat-sensitive sleeve, the pipeline is effectively supported under the condition that the core rod is taken out, a thin-wall seamless steel tube is convenient to produce, the production efficiency is improved, the production quality of the hot-rolled seamless steel tube is improved, and the economic benefit of the thin-wall seamless steel tube is improved.
Further, the heat conduction spiral sleeve is spirally arranged along the taper of the heat-sensitive sleeve and is matched with the stable inner-layer pipe. The heat conduction helical casing is arranged along the taper of the heat-sensitive casing, when the core rod cylinder perforates the tube blank, the heat-sensitive casing, the heat conduction helical casing and other components close to one side of the core rod cylinder are enlarged in the thermal expansion range, the contact time of other hole walls is prolonged, and the auxiliary supporting structure is effectively guaranteed to completely move in the pipeline hole.
Furthermore, a plurality of deformation support balls are fixedly connected to the heat conduction spiral sleeve, the deformation support balls are arranged at equal intervals, and support memory metal clusters are filled in the deformation support balls. Support memory metal group and be heated and produce memory deformation, enlarge the volume of deformation support ball, supplementary stable form inlayer pipe supports the pipeline inner wall, cushion rolling and decide (subtract) the pressure that the footpath made the production, reduce the probability that the hole produced deformation, improve the circularity of pipeline hole.
Furthermore, a plurality of cylindrical heat conducting metal wires are filled in the heat conducting spiral sleeve, and the cylindrical heat conducting metal wires are woven into strips by adopting a twist winding method.
Furthermore, elastic heat conducting particles located on the peripheral side of the support memory metal cluster are filled in the support memory metal cluster, and the cylindrical heat conducting metal wire extends into the support memory metal cluster and is matched with the elastic heat conducting particles. The strip column-shaped heat conducting metal wire and the elastic heat conducting particles are matched with each other to effectively transfer heat, so that the support memory metal cluster can effectively absorb heat and generate memory deformation to support the inner wall.
Furthermore, the outer end of the heat-sensitive sleeve is fixedly connected with a plurality of heat-sensitive expansion rings, and the taper of the heat-sensitive expansion rings is matched with that of the heat-sensitive sleeve.
Furthermore, the thermosensitive expansion ring is internally filled with thermosensitive expansion filler, and the thermosensitive expansion filler is flexible spherical filler. The heat-sensitive expansion ring and the heat-sensitive expansion filler are heated to expand and form an annular support, so that the deformation of the heat-sensitive sleeve and the heat-conducting spiral sleeve is controlled, the inner hole of the pipeline is circularly supported, the pressure of the inner hole caused by thermal expansion is reduced while the pressure generated in the production process is buffered, the deformation uniformity of crystal grains of the steel pipe in the rolling process is improved, the compactness among the crystal grains is improved, and the performance of the hot-rolled seamless steel pipe is improved.
Furthermore, the maximum diameter of the heat-sensitive sleeve is 0.8-0.7 times of the diameter of the mandrel cylinder, and the diameter of the outer circle of the positioning table is equal to the diameter of the mandrel cylinder. Deformation gaps are reserved for all parts of the auxiliary supporting structure, so that the auxiliary supporting structure can effectively support the air passage, the processing stress is effectively buffered, and the deformation is reduced.
Further, the maximum value of the diameter of the outer circle of the heat-sensitive expansion ring is equal to the diameter of the mandrel cylinder.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) according to the scheme, the auxiliary supporting structure is bonded at the rear end of the mandrel, so that when the mandrel is used for perforating a tube blank, the auxiliary supporting structure expands under the influence of the heat of the tube blank and is supported on the inner side of the tube blank to support the inner diameter of the tube blank, the inner diameter of a pipeline is effectively supported in the tube rolling and diameter fixing (reducing) processes, the roundness of the inner diameter is improved, the deformation of the inner diameter is reduced in the production process, the production quality of a hot-rolled seamless steel tube is improved, the mandrel can be taken out by using a perforating machine after perforation, the subsequent rod stripping process is effectively reduced, the investment of equipment is reduced, and the production cost is reduced.
(2) The heat-sensitive sleeve, the positioning table and the heat-conducting spiral sleeve are expanded by the heat of the tube blank, so that the volume of the heat-sensitive sleeve is increased, the heat-sensitive sleeve is in contact with the inner wall of a pipeline, the stable inner-layer tube supports the heat-sensitive sleeve, the pipeline is effectively supported under the condition that the core rod is taken out, a thin-wall seamless steel tube is convenient to produce, the production efficiency is improved, the production quality of the hot-rolled seamless steel tube is improved, and the economic benefit of the thin-wall seamless steel tube is improved.
(3) The heat conduction helical casing is arranged along the taper of the heat-sensitive casing, when the core rod cylinder perforates the tube blank, the heat-sensitive casing, the heat conduction helical casing and other components close to one side of the core rod cylinder are enlarged in the thermal expansion range, the contact time of other hole walls is prolonged, and the auxiliary supporting structure is effectively guaranteed to completely move in the pipeline hole.
(4) Support memory metal group and be heated and produce memory deformation, enlarge the volume of deformation support ball, supplementary stable form inlayer pipe supports the pipeline inner wall, cushion rolling and decide (subtract) the pressure that the footpath made the production, reduce the probability that the hole produced deformation, improve the circularity of pipeline hole.
(5) The strip column-shaped heat conducting metal wire and the elastic heat conducting particles are matched with each other to effectively transfer heat, so that the support memory metal cluster can effectively absorb heat and generate memory deformation to support the inner wall.
(6) The heat-sensitive expansion ring and the heat-sensitive expansion filler are heated to expand and form an annular support, so that the deformation of the heat-sensitive sleeve and the heat-conducting spiral sleeve is controlled, the inner hole of the pipeline is circularly supported, the pressure of the inner hole caused by thermal expansion is reduced while the pressure generated in the production process is buffered, the deformation uniformity of crystal grains of the steel pipe in the rolling process is improved, the compactness among the crystal grains is improved, and the performance of the hot-rolled seamless steel pipe is improved.
(7) Deformation gaps are reserved for all parts of the auxiliary supporting structure, so that the auxiliary supporting structure can effectively support the air passage, the processing stress is effectively buffered, and the deformation is reduced.
Drawings
FIG. 1 is a schematic diagram of the process flow structure of the present invention;
FIG. 2 is a schematic axial view of the mandrel cylinder of the present invention;
FIG. 3 is a schematic view of the production frame structure of the present invention;
FIG. 4 is a schematic view of the cross-sectional axial structure of the heat sensitive sleeve of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4;
FIG. 6 is a schematic view of the internal structure of the deformable support ball of the present invention;
FIG. 7 is a schematic axial view of the mandrel cylinder of the present invention;
FIG. 8 is a schematic view of a heat sensitive quill configuration of the present invention;
FIG. 9 is a schematic axial view of the heat-conducting spiral sleeve of the present invention;
FIG. 10 is a schematic view of the heat sensitive sleeve of the present invention expanded and disengaged from the mandrel cylinder;
fig. 11 is a front view schematically illustrating a conventional mandrel cylinder according to the present invention.
The reference numbers in the figures illustrate:
1 core rod cylinder, 101 guide cone, 102 connecting rod, 2 heat-sensitive sleeve, 201 heat-sensitive expansion ring, 202 positioning table, 203 heat-sensitive expansion filler, 204 stable inner tube, 3 heat-conducting spiral sleeve, 301 deformation support ball and 302 support memory metal mass.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1 to 11, a production process of an inner diameter protective hot-rolled seamless steel tube includes the following steps:
s1, preprocessing a pipe blank: cutting and heating the qualified tube blank;
s2, core rod preparation: the rear end of the core rod is bonded with an auxiliary supporting structure by hot-melt glue to form a protective core rod;
s3, perforating: conveying the heated pipe blank to a perforating machine, and perforating the pipe blank by using a protective mandrel;
s4, mandrel separation: after the mandrel completely penetrates through the tube blank, the auxiliary supporting structure is separated from the mandrel due to thermal deformation of the auxiliary supporting structure, and the auxiliary supporting structure is supported at the inner hole of the tube blank;
s5, pipe rolling: the method comprises the following steps of conveying a tubular billet with an auxiliary supporting structure to a tube rolling mill, reducing the wall thickness of the tubular billet, supporting the inner diameter of the tubular billet by the auxiliary supporting structure, reducing the deformation of the tubular billet, and forming a pierced billet;
s6, reheating: conveying the pierced billets to auxiliary heating equipment for reheating treatment;
s7, diameter determination (reduction): conveying the reheated pierced billet into a diameter fixing (reducing) machine to round the outer diameter of the pierced billet, and enabling an auxiliary support structure to continuously support the inner diameter;
s8, cooling and separating: conveying the rounded pipeline into a cooling separation line to cool the pipeline, enabling an auxiliary supporting structure to be cooled and contracted, separating the pipeline, and recycling the auxiliary supporting structure;
s9, straightening and cutting: moving the cooled pipeline to a straightening device for straightening, and cutting off two ends of the pipeline by a cutting machine to obtain a hot-rolled seamless steel pipe;
s10, inspecting and warehousing: and (4) inspecting and detecting the processed hot-rolled seamless steel pipe, and warehousing and storing the qualified hot-rolled seamless steel pipe. The auxiliary support structure is bonded at the rear end of the mandrel, so that when the mandrel is used for perforating a pipe blank, the auxiliary support structure expands under the influence of the heat of the pipe blank and is supported on the inner side of the pipe blank to support the inner diameter of the pipe blank, the inner diameter of a pipeline is effectively supported in the pipe rolling and diameter fixing (reducing) processes, the roundness of the inner diameter is improved, the deformation of the pipe blank in the production process is reduced, the production quality of a hot-rolled seamless steel pipe is improved, the mandrel can be taken out by using a perforating machine after perforation, the subsequent bar stripping process is effectively reduced, the investment of equipment is reduced, and the production cost is reduced.
Example 2:
referring to fig. 1 to 11, wherein the same or corresponding components as those in embodiment 1 are designated by the same reference numerals as those in embodiment 1, only the points different from embodiment 1 will be described below for the sake of convenience. This example 2 differs from example 1 in that: referring to fig. 2 and 4, the mandrel includes a mandrel cylinder 1, a guiding cone 101 fixedly connected to the right end of the mandrel cylinder 1, and a connecting rod 102 fixedly connected to the left end of the mandrel cylinder 1, the auxiliary supporting structure includes a heat-sensitive sleeve 2 and a heat-conducting spiral sleeve 3, a stable inner tube 204 is sleeved on the outer end of the mandrel cylinder 1, a heat-conducting spiral sleeve 3 is sleeved on the outer end of the stable inner tube 204, a heat-sensitive sleeve 2 is sleeved on the outer end of the heat-conducting spiral sleeve 3, positioning tables 202 are fixedly connected to the left and right ends of the heat-sensitive sleeve 2, the positioning tables 202 are fixedly connected to the heat-conducting spiral sleeve 3 and the stable inner tube 204, the positioning tables 202 on the right side are bonded to the mandrel cylinder 1, the heat-sensitive sleeve 2 is a cone, and the. The heat-sensitive sleeve 2, the positioning table 202 and the heat-conducting spiral sleeve 3 are expanded by the heat of the tube blank, so that the volume of the heat-sensitive sleeve is increased, the heat-sensitive sleeve is in contact with the inner wall of a pipeline, the stable inner-layer tube 204 supports the heat-sensitive sleeve, the pipeline is effectively supported under the condition that the core rod is taken out, a thin-wall seamless steel tube is convenient to produce, the production efficiency is improved, the production quality of the hot-rolled seamless steel tube is improved, and the economic benefit of the thin-wall seamless steel tube is improved.
Referring to fig. 2, the heat conductive screw sleeve 3 is spirally disposed along the taper of the heat sensitive sleeve 2 and is matched with the stable inner tube 204. The heat conduction helical casing 3 is arranged along the taper of the heat-sensitive sleeve 2, when the pipe blank is perforated by the core rod cylinder 1, the heat-sensitive sleeve 2 and the heat conduction helical casing 3 which are close to one side of the core rod cylinder 1 are heated to expand in a range, the contact time of other hole walls is increased, and the auxiliary supporting structure is effectively guaranteed to completely move in the pipeline hole.
Referring to fig. 5, a plurality of deformation support balls 301 are fixedly connected to the heat conducting spiral casing 3, the plurality of deformation support balls 301 are arranged at equal intervals, and the deformation support balls 301 are filled with support memory metal clusters 302. The support memory metal group 302 is heated to generate memory deformation, the size of the deformation support ball 301 is enlarged, the auxiliary stable inner-layer pipe 204 supports the inner wall of the pipeline, the pressure generated by buffer rolling and diameter fixing (reducing) is reduced, the probability of deformation of an inner hole is reduced, and the roundness of the inner hole of the pipeline is improved.
Referring to fig. 6, a plurality of cylindrical heat conducting wires are filled in the heat conducting spiral sleeve 3, and the plurality of cylindrical heat conducting wires are woven into strips by a twist winding method.
Referring to fig. 6, the supporting memory metal clusters 302 are filled with elastic heat-conducting particles located around the supporting memory metal clusters 302, and the cylindrical heat-conducting wires extend into the supporting memory metal clusters 302 and are matched with the elastic heat-conducting particles. The strip column-shaped heat conducting metal wires and the elastic heat conducting particles are matched with each other to effectively transfer heat, so that the support memory metal clusters 302 can effectively absorb heat and generate memory deformation to support the inner wall.
Referring to fig. 2 and 4, a plurality of thermal expansion rings 201 are fixedly connected to the outer end of the thermal sleeve 2, and the thermal expansion rings 201 are matched with the taper of the thermal sleeve 2.
Referring to fig. 3, the heat-sensitive expansion ring 201 is filled with a heat-sensitive expansion filler 203, and the heat-sensitive expansion filler 203 is a flexible spherical filler. The heat-sensitive expansion ring 201 and the heat-sensitive expansion filler 203 are heated to expand and form an annular support, so that the deformation of the heat-sensitive sleeve 2 and the heat-conducting spiral sleeve 3 is controlled, a circular support is formed for the inner hole of the pipeline, the pressure brought to the inner hole by heat expansion is reduced while the pressure generated in the production process is buffered, the deformation uniformity of crystal grains of the steel pipe in the rolling process is improved, the compactness among the crystal grains is improved, and the performance of the hot-rolled seamless steel pipe is improved.
Referring to fig. 2, the maximum diameter of the heat-sensitive sleeve 2 is 0.8 to 0.7 times the diameter of the mandrel cylinder 1, and the outer diameter of the positioning table 202 is equal to the diameter of the mandrel cylinder 1. Deformation gaps are reserved for all parts of the auxiliary supporting structure, so that the auxiliary supporting structure can effectively support the air passage, the processing stress is effectively buffered, and the deformation is reduced.
Referring to fig. 2, the maximum value of the outer diameter of the thermal expansion ring 201 is equal to the diameter of the mandrel cylinder 1.
Referring to fig. 1-11, the method of use: before punching, the auxiliary support structure is sleeved outside the connecting rod 102 through the stable inner layer pipe 204 in advance, and the positioning table 202 is bonded with the mandrel cylinder 1 by using hot melt glue (see fig. 2); when a piercing machine drives a mandrel to pierce a tube blank, a guide cone 101 is in contact with the tube blank in advance to guide the piercing of a mandrel cylinder 1 and an auxiliary support structure, the guide cone 101 and the mandrel cylinder 1 continuously enter the tube blank to gradually form an inner hole inside the tube blank, the auxiliary support structure moves with a connecting rod 102 and the mandrel cylinder 1 to enter the inner hole, the auxiliary support structure is in contact with the wall of the inner hole along with a heat-sensitive sleeve 2, a heat-sensitive expansion ring 201, a heat-sensitive expansion filler 203, a heat-conductive spiral sleeve 3, a deformation support ball 301 and a support memory metal cluster 302 on one side close to the mandrel cylinder 1, the auxiliary support structure is heated and expanded in advance, the diameter of the auxiliary support structure is small, the auxiliary support structure is not in contact with the wall of the hole during the piercing process, when the guide cone 101 completely penetrates out of the tube blank, the hot-melt glue is dissolved to separate the positioning table 202 from, The outer ends of the thermal-sensitive expansion ring 201 and the positioning table 202 are tightly attached to the hole wall through expansion support of the deformation support ball 301, the thermal-sensitive expansion ring and the positioning table are supported through the stable inner-layer tube 204 and the support memory metal cluster 302 in an expansion mode, the mandrel cylinder 1 is separated and extracted from the inner hole and the stable inner-layer tube 204 (see the figure 10), the capillary with the auxiliary support structure enters the next procedure for production and processing, the thermal-sensitive expansion ring 201 and the thermal-sensitive sleeve 2 effectively absorb and relieve production stress in the processing process, and the deformation amount of the inner hole is reduced. The auxiliary support structure is bonded at the rear end of the mandrel, so that when the mandrel is used for perforating a pipe blank, the auxiliary support structure expands under the influence of the heat of the pipe blank and is supported on the inner side of the pipe blank to support the inner diameter of the pipe blank, the inner diameter of a pipeline is effectively supported in the pipe rolling and diameter fixing (reducing) processes, the roundness of the inner diameter is improved, the deformation of the pipe blank in the production process is reduced, the production quality of a hot-rolled seamless steel pipe is improved, the mandrel can be taken out by using a perforating machine after perforation, the subsequent bar stripping process is effectively reduced, the investment of equipment is reduced, and the production cost is reduced.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (10)
1. A production process of an inner diameter protection type hot-rolled seamless steel pipe is characterized by comprising the following steps: the method comprises the following steps:
s1, preprocessing a pipe blank: cutting and heating the qualified tube blank;
s2, core rod preparation: the rear end of the core rod is bonded with an auxiliary supporting structure by hot-melt glue to form a protective core rod;
s3, perforating: conveying the heated pipe blank to a perforating machine, and perforating the pipe blank by using a protective mandrel;
s4, mandrel separation: after the mandrel completely penetrates through the tube blank, the auxiliary supporting structure is separated from the mandrel due to thermal deformation of the auxiliary supporting structure, and the auxiliary supporting structure is supported at the inner hole of the tube blank;
s5, pipe rolling: the method comprises the following steps of conveying a tubular billet with an auxiliary supporting structure to a tube rolling mill, reducing the wall thickness of the tubular billet, supporting the inner diameter of the tubular billet by the auxiliary supporting structure, reducing the deformation of the tubular billet, and forming a pierced billet;
s6, reheating: conveying the pierced billets to auxiliary heating equipment for reheating treatment;
s7, diameter determination (reduction): conveying the reheated pierced billet into a diameter fixing (reducing) machine to round the outer diameter of the pierced billet, and enabling an auxiliary support structure to continuously support the inner diameter;
s8, cooling and separating: conveying the rounded pipeline into a cooling separation line to cool the pipeline, enabling an auxiliary supporting structure to be cooled and contracted, separating the pipeline, and recycling the auxiliary supporting structure;
s9, straightening and cutting: moving the cooled pipeline to a straightening device for straightening, and cutting off two ends of the pipeline by a cutting machine to obtain a hot-rolled seamless steel pipe;
s10, inspecting and warehousing: and (4) inspecting and detecting the processed hot-rolled seamless steel pipe, and warehousing and storing the qualified hot-rolled seamless steel pipe.
2. The production process of the inner diameter protective hot-rolled seamless steel tube according to claim 1, characterized in that: the core rod comprises a core rod cylinder (1), a guide cone body (101) fixedly connected with the right end of the core rod cylinder (1) and a connecting rod (102) fixedly connected with the left end of the core rod cylinder (1), the auxiliary supporting structure comprises a heat-sensitive sleeve (2) and a heat-conducting spiral sleeve (3), the outer end of the core rod cylinder (1) is sleeved with a stable inner-layer tube (204), the outer end of the stable inner-layer tube (204) is sleeved with the heat-conducting spiral sleeve (3), the outer end of the heat-conducting spiral sleeve (3) is sleeved with the heat-sensitive sleeve (2), the left end and the right end of the heat-sensitive sleeve (2) are fixedly connected with positioning tables (202), the positioning tables (202) are fixedly connected with the heat-conducting spiral sleeve (3) and the stable inner-layer tube (204) and are fixedly connected with each other, the positioning tables (202) are bonded with the core rod cylinder (1, and the small diameter end is located on the right side.
3. The production process of the inner diameter protective hot-rolled seamless steel tube according to claim 2, characterized in that: the heat conduction spiral sleeve (3) is spirally arranged along the taper of the heat-sensitive sleeve (2) and is matched with the stable inner-layer tube (204).
4. The production process of the inner diameter protective hot-rolled seamless steel tube according to claim 2, characterized in that: the heat conduction spiral shell (3) are fixedly connected with a plurality of deformation supporting balls (301) in a plurality of equidistant settings of the deformation supporting balls (301), and the deformation supporting balls (301) are filled with supporting memory metal clusters (302).
5. The production process of the internal diameter protected hot-rolled seamless steel tube according to claim 4, characterized in that: the heat conduction spiral sleeve (3) is filled with a plurality of cylindrical heat conduction metal wires which are woven into strips by adopting a twist winding method.
6. The production process of the internal diameter protected hot-rolled seamless steel tube according to claim 5, characterized in that: elastic heat conduction particles located on the peripheral side of the support memory metal cluster (302) are filled in the support memory metal cluster (302), and the cylindrical heat conduction metal wire extends into the support memory metal cluster (302) and is matched with the elastic heat conduction particles.
7. The production process of the inner diameter protective hot-rolled seamless steel tube according to claim 2, characterized in that: the outer end of the heat-sensitive sleeve (2) is fixedly connected with a plurality of heat-sensitive expansion rings (201), and the tapers of the heat-sensitive expansion rings (201) are matched with the tapers of the heat-sensitive sleeve (2).
8. The production process of the inner diameter protective hot-rolled seamless steel tube according to claim 7, characterized in that: the heat-sensitive expansion ring (201) is filled with heat-sensitive expansion filler (203), and the heat-sensitive expansion filler (203) is flexible spherical filler.
9. The production process of the inner diameter protective hot-rolled seamless steel tube according to claim 2, characterized in that: the maximum diameter of the heat-sensitive sleeve (2) is 0.8-0.7 times of the diameter of the mandrel cylinder (1), and the excircle diameter of the heat-sensitive expansion ring (201) is equal to the diameter of the mandrel cylinder (1).
10. The production process of the inner diameter protective hot-rolled seamless steel tube according to claim 2, characterized in that: the maximum value of the diameter of the outer circle of the heat-sensitive expansion ring (201) is equal to the diameter of the mandrel cylinder (1).
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| CN202110187008.3A CN113102545A (en) | 2021-02-09 | 2021-02-09 | Production process of inner diameter protection type hot-rolled seamless steel tube |
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| CN202110187008.3A CN113102545A (en) | 2021-02-09 | 2021-02-09 | Production process of inner diameter protection type hot-rolled seamless steel tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600909A (en) * | 2021-07-26 | 2021-11-05 | 上海拓天动力技术有限公司 | Hydraulic pipe cutting equipment and hydraulic pipe production process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113600909A (en) * | 2021-07-26 | 2021-11-05 | 上海拓天动力技术有限公司 | Hydraulic pipe cutting equipment and hydraulic pipe production process |
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Application publication date: 20210713 |