CN112518240A - Production method of stainless steel composite billet - Google Patents
Production method of stainless steel composite billet Download PDFInfo
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- CN112518240A CN112518240A CN202011297470.0A CN202011297470A CN112518240A CN 112518240 A CN112518240 A CN 112518240A CN 202011297470 A CN202011297470 A CN 202011297470A CN 112518240 A CN112518240 A CN 112518240A
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 134
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 134
- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 116
- 239000010959 steel Substances 0.000 claims abstract description 116
- 238000005452 bending Methods 0.000 claims abstract description 33
- 238000001125 extrusion Methods 0.000 claims abstract description 28
- 238000005498 polishing Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000007493 shaping process Methods 0.000 claims abstract description 5
- 238000009966 trimming Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims description 32
- 238000003466 welding Methods 0.000 claims description 28
- 239000011248 coating agent Substances 0.000 claims description 19
- 238000000576 coating method Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 17
- 238000005253 cladding Methods 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 239000011247 coating layer Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 229910000975 Carbon steel Inorganic materials 0.000 description 6
- 239000010962 carbon steel Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
Abstract
The invention discloses a production method of a stainless steel composite billet, which comprises the following steps: s101, calculating the size value of a target stainless steel plate; s102, polishing and trimming a steel core to be coated and a target stainless steel plate; s103, pre-bending the corrected target stainless steel plate; s104, heating to a target temperature; s105, combining the fixedly connected steel core to be coated with the arc-shaped curved surface ring heated to the target temperature to form a primary blank assembly; s106, extruding the primary blank assembly through an extrusion die, and combining the semi-circular curved surface ring and the steel core to be coated to form a middle-grade blank assembly; s107, shaping and extruding the intermediate-level blank assembly to form an incomplete blank assembly; and S108, sealing the opening seam of the wrapping ring of the incomplete billet assembly to form the target composite billet. The production method of the stainless steel composite billet directly combines the steel core to be coated with the stainless steel coating layer physically through the die, and has good combination effect.
Description
Technical Field
The invention relates to the technical field of preparation processes of stainless steel composite billets, in particular to a production method of a stainless steel composite billet.
Background
The stainless steel composite material is prepared by taking stainless steel as a clad material, taking plain carbon steel or common low alloy steel as a base material and adopting a metallurgical bonding mode. In recent years, some other types of stainless steel composite materials are produced as well, because the stainless steel composite materials have incomparable cost performance compared with common steel materials and all stainless steel materials.
The composite stainless steel billet is used as main material for producing composite stainless steel product in steel plant and consists of steel core of plain carbon steel and outer stainless steel sleeve. The typical process for assembling the composite steel billet at present comprises the following steps: surface treatment of stainless steel blank and carbon steel blank → penetration of the carbon steel blank into a stainless steel sleeve → end welding → heating and rolling to form a material. In the existing preparation process of the composite steel billet, the assembly difficulty is high, the assembly efficiency is low, meanwhile, because the inner surface of the formed stainless steel pipe is difficult to treat, impurities are easy to remain on the joint surface, and a large-area un-compounded area possibly exists between the stainless steel coating and the carbon steel substrate, so that the joint effect is influenced.
Disclosure of Invention
The invention provides a production method of a stainless steel composite billet, which aims to solve the technical problem of poor bonding effect between a stainless steel coating and a carbon steel substrate in the existing preparation process of the composite billet because the inner surface of a formed stainless steel pipe is difficult to treat.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a production method of stainless steel composite billets comprises the following steps: s101, calculating the size value of a target stainless steel plate for coating the steel core to be coated according to the size value of the steel core to be coated; s102, polishing and trimming a steel core to be coated and a target stainless steel plate; s103, pre-bending the corrected target stainless steel plate to enable the target stainless steel plate to be bent in the width direction and reach a required curvature so as to form an arc-shaped curved surface ring with an opening; s104, heating the arc-shaped curved surface ring to a target temperature; s105, loading the steel core to be coated into the arc-shaped curved ring heated to the target temperature, fixedly connecting the steel core to be coated with the arc-shaped curved ring heated to the target temperature by adopting a spot welding fixing method, and combining the fixedly connected steel core to be coated with the arc-shaped curved ring heated to the target temperature to form a primary blank assembly; s106, extruding the primary blank assembly through an extrusion die, so that the outer wall surface of the bent part of the arc-shaped curved surface ring of the primary blank assembly is matched with the extrusion die, the inner wall surface of the bent part of the arc-shaped curved surface ring is matched with the steel core to be coated, further, the arc-shaped curved surface is extruded and processed into a semi-circular curved surface ring coated with the steel core to be coated, and the semi-circular curved surface ring and the steel core to be coated are combined to form a middle-grade blank assembly; s107, shaping and extruding the intermediate blank assembly by using a bending forming die to enable the semi-circular curved surface ring of the intermediate blank assembly to be extruded to a coating ring which is completely attached to the outer wall surface of the steel core to be coated and has an opening seam, and meanwhile, the coating ring and the steel core to be coated form an incomplete blank assembly, and the circular runout of the incomplete blank assembly is not more than 0.2 mm; and S108, sealing the opening seam of the wrapping ring of the incomplete billet assembly to form the target composite billet.
Further, the shape of the target stainless steel plate is a block, and the step S101 specifically includes: calculating the width value of the target stainless steel plate according to the diameter of the steel core to be coated and the thickness value of the target stainless steel plate, reserving a machining allowance of 5 mm for the width value of the target stainless steel plate, calculating the length value of the target stainless steel plate according to the length value of the steel core to be coated and the thickness value of the target stainless steel plate, and reserving a machining allowance of 1-3 mm for the length value of the target stainless steel plate.
Further, respectively milling grooves on the side wall surfaces of two sides of the target stainless steel plate, wherein the grooves are inclined surfaces distributed along the width direction of the target stainless steel plate; respectively polishing the upper surface and the lower surface of the target stainless steel plate and removing burrs; and polishing the circumferential outer wall surface of the steel core to be coated and removing burrs.
Further, the groove is a slope of 30 to 45 degrees, and the groove is inclined outward in a direction from the upper surface toward the lower surface of the target stainless steel plate.
Further, step S103 specifically includes: and pre-bending the corrected target stainless steel plate to ensure that the target stainless steel plate is bent along the width direction to reach the required curvature to form an arc-shaped curved ring with an opening, wherein the lower surface of the arc-shaped curved ring is contacted with the steel core to be coated when the arc-shaped curved ring coats the steel core to be coated, and the arc-shaped curved ring and the steel core to be coated are coaxially arranged.
Further, the arc-shaped curved surface ring is placed in a heating furnace to be heated to 300 ℃.
Further, extrusion die includes the forming bottom plate and the pressfitting mother board that set up relatively in the direction of height, but the pressfitting mother board is at direction of height reciprocating motion, and the forming bottom plate is concave on the surface towards the pressfitting mother board to be equipped with the shaping recess that is used for holding the arc curved surface ring, and the pressfitting mother board is concave on the surface towards the forming bottom plate to be equipped with the directional guide recess that is used for guiding and extrudeing and treats the cladding steel core: step S105 specifically includes: placing the primary blank assembly on a forming groove of a forming bottom plate, and enabling an opening of an arc-shaped curved surface ring of the primary assembly to face a pressing mother plate and be correspondingly arranged; moving the pressing mother board towards the forming bottom board and attaching the pressing mother board to the outer wall surface of the steel core to be coated to extrude the steel core to be coated of the primary blank assembly, and pressing the arc-shaped curved ring and the steel core to be coated into the forming groove and carrying out extrusion forming; the outer wall surface of the bending part of the arc-shaped curved surface ring of the primary blank assembly is attached to the groove wall surface of the forming groove, the inner wall surface of the bending part of the arc-shaped curved surface ring is attached to the steel core to be coated, the arc-shaped curved surface is extruded and processed into a semi-circular curved surface ring which coats the steel core to be coated, and the semi-circular curved surface ring and the steel core to be coated are combined to form the intermediate-grade blank assembly.
Further, the gap between the outer wall surface of the curved portion of the arcuate curved ring of the primary blank assembly and the groove wall surface of the forming groove is set to be not more than 10 mm.
Furthermore, the bending forming die comprises a feeding frame and an upper clamping roller which are oppositely arranged in the height direction, the upper clamping roller can reciprocate towards the feeding frame, a supporting groove for supporting a semicircular curved ring of the middle-grade blank assembly is concavely arranged on the surface of the feeding frame towards the upper clamping roller, and a pressing groove for pressing an opening of the middle-grade blank assembly is concavely arranged on the surface of the upper clamping roller towards the feeding frame; the bending forming die also comprises side clamping rollers which are respectively arranged at two sides of the upper clamping roller and are provided with side wall pressing surfaces, the two side clamping rollers are oppositely arranged, the two side clamping rollers synchronously move to laterally extrude and position a middle-grade blank assembly arranged on the feeding frame, and simultaneously, the extrusion necking is carried out under the auxiliary action of the upper clamping rollers; step S107 specifically includes: arranging the intermediate-grade blank assembly in a support groove of a feeding frame along the axial direction; starting the side clamping rollers to enable the two side clamping rollers to be synchronously close to the side surface of the middle-stage blank assembly to clamp and extrude, and starting the upper clamping roller to extrude and reduce the extruded middle-stage blank assembly; and then the semi-circle curved surface ring of the intermediate blank assembly is extruded to the cladding ring which is completely attached to the outer wall surface of the steel core to be clad and has an opening seam, meanwhile, the cladding ring and the steel core to be clad form an incomplete blank assembly, and the circular runout of the incomplete blank assembly is not more than 0.2 mm.
Further, S107 specifically includes: sealing the opening seam of the wrapping ring of the incomplete blank assembly, and then sending the opening seam into a vacuum welding machine for welding, wherein the welding current is kept at 150A during welding, and the welding speed is 80-100 mm/min, so that the target composite billet is formed after welding.
The invention has the following beneficial effects:
the production method of the stainless steel composite billet comprises the steps of cleaning, polishing and finishing the surfaces of a target stainless steel plate and a steel core to be coated, extruding the target stainless steel plate by adopting an extrusion die, and performing sizing extrusion by adopting a bending forming die to enable a target stainless steel coating material to be tightly attached to the surface of the steel core to be coated to form the target composite billet, wherein the circular runout of the target composite billet is not more than 0.2mm, and the target composite billet is formed on a production line by adopting mechanical processing and one-step forming, so that the operation is simple. Meanwhile, the steel core to be coated and the stainless steel coating are directly and physically combined through a die, and the combined surface of the steel core to be coated and the stainless steel coating is tightly combined in an extrusion mode, so that the process is simple, the combined surface is purer, fewer impurities exist, and the combination effect is good.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method of producing a composite stainless steel blank according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural view of an extrusion die used in the method for producing a stainless steel composite billet according to the preferred embodiment of the present invention;
fig. 3 is a schematic structural view of a bending mold used in the method for producing a stainless steel composite slab according to the preferred embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
FIG. 1 is a flow chart of a method of producing a composite stainless steel blank according to a preferred embodiment of the present invention; fig. 2 is a schematic structural view of an extrusion die used in the method for producing a stainless steel composite billet according to the preferred embodiment of the present invention; fig. 3 is a schematic structural view of a bending mold used in the method for producing a stainless steel composite slab according to the preferred embodiment of the present invention.
As shown in fig. 1, the method for producing a stainless steel composite billet of the present embodiment includes the following steps: s101, calculating the size value of a target stainless steel plate for coating the steel core to be coated according to the size value of the steel core to be coated; s102, polishing and trimming a steel core to be coated and a target stainless steel plate; s103, pre-bending the corrected target stainless steel plate to enable the target stainless steel plate to be bent in the width direction and reach a required curvature so as to form an arc-shaped curved surface ring with an opening; s104, heating the arc-shaped curved surface ring to a target temperature; s105, loading the steel core to be coated into the arc-shaped curved ring heated to the target temperature, fixedly connecting the steel core to be coated with the arc-shaped curved ring heated to the target temperature by adopting a spot welding fixing method, and combining the fixedly connected steel core to be coated with the arc-shaped curved ring heated to the target temperature to form a primary blank assembly; s106, extruding the primary blank assembly through an extrusion die, so that the outer wall surface of the bent part of the arc-shaped curved surface ring of the primary blank assembly is matched with the extrusion die, the inner wall surface of the bent part of the arc-shaped curved surface ring is matched with the steel core to be coated, further, the arc-shaped curved surface is extruded and processed into a semi-circular curved surface ring coated with the steel core to be coated, and the semi-circular curved surface ring and the steel core to be coated are combined to form a middle-grade blank assembly; s107, shaping and extruding the intermediate blank assembly by using a bending forming die to enable the semi-circular curved surface ring of the intermediate blank assembly to be extruded to a coating ring which is completely attached to the outer wall surface of the steel core to be coated and has an opening seam, and meanwhile, the coating ring and the steel core to be coated form an incomplete blank assembly, and the circular runout of the incomplete blank assembly is not more than 0.2 mm; and S108, sealing the opening seam of the wrapping ring of the incomplete billet assembly to form the target composite billet.
The production method of the stainless steel composite billet comprises the steps of cleaning, polishing and finishing the surfaces of a target stainless steel plate and a steel core to be coated, extruding the target stainless steel plate by adopting an extrusion die, and performing sizing extrusion by adopting a bending forming die to enable a target stainless steel coating material to be tightly attached to the surface of the steel core to be coated to form the target composite billet, wherein the circular runout of the target composite billet is not more than 0.2mm, and the target composite billet is formed on a production line by adopting mechanical processing and one-step forming, so that the operation is simple. Meanwhile, the steel core to be coated and the stainless steel coating are directly and physically combined through a die, and the combined surface of the steel core to be coated and the stainless steel coating is tightly combined in an extrusion mode, so that the process is simple, the combined surface is purer, fewer impurities exist, and the combination effect is good.
Further, in order to reduce consumables and simultaneously enable the target stainless steel plate to completely cover the steel core to be coated, the target stainless steel plate is in a block shape, and the step S101 specifically includes: calculating the width value of the target stainless steel plate according to the diameter of the steel core to be coated and the thickness value of the target stainless steel plate, reserving a machining allowance of 5 mm for the width value of the target stainless steel plate, calculating the length value of the target stainless steel plate according to the length value of the steel core to be coated and the thickness value of the target stainless steel plate, and reserving a machining allowance of 2-3 mm for the length value of the target stainless steel plate. In the invention, the split target stainless steel plate and the steel core to be coated are adopted, the target stainless steel plate is in a rectangular block shape, so that the target stainless steel plate and the steel core to be coated are respectively conveniently and respectively polished, the surface roughness of the matching surface of the target stainless steel plate and the steel core to be coated is kept in a target range, and a subsequent hot rolling process provides a clean interface environment to ensure the metallurgical bonding of the two materials.
Further, respectively milling grooves on the side wall surfaces of two sides of the target stainless steel plate, wherein the grooves are inclined surfaces distributed along the width direction of the target stainless steel plate; respectively polishing the upper surface and the lower surface of the target stainless steel plate and removing burrs; and polishing the circumferential outer wall surface of the steel core to be coated and removing burrs.
More preferably, the bevel is a slope of 30 to 45 degrees, and the bevel is inclined outward in a direction from the upper surface toward the lower surface of the target stainless steel plate. Preferably, in the invention, the groove is a slope of 45 degrees, and the grooves are milled on the side wall surfaces of the two sides of the target stainless steel plate respectively, so that when the incomplete blank assembly is subjected to necking, the bending forming die is favorably guided, and further, the semi-circular curved surface ring of the middle-stage blank assembly is extruded to be completely attached to the outer wall surface of the steel core to be coated.
Further, step S103 specifically includes: and pre-bending the corrected target stainless steel plate to ensure that the target stainless steel plate is bent along the width direction to reach the required curvature to form an arc-shaped curved ring with an opening, wherein the lower surface of the arc-shaped curved ring is contacted with the steel core to be coated when the arc-shaped curved ring coats the steel core to be coated, and the arc-shaped curved ring and the steel core to be coated are coaxially arranged. And pre-bending the corrected target stainless steel plate by a pre-bending mechanism to ensure that the arc-shaped curved surface ring is fed and the steel core to be coated is coaxially arranged, so that the coating gap of the target stainless steel plate is favorably reduced in subsequent processing.
Further, in order to facilitate the formation of the target stainless steel plate, the arc-shaped curved ring was placed in a heating furnace and heated to 300 ℃.
As shown in fig. 2, further, the extrusion die includes a forming bottom plate and a pressing mother plate oppositely arranged in the height direction, the pressing mother plate is reciprocally movable in the height direction, a forming groove for accommodating the arc-shaped curved ring is concavely provided on the surface of the forming bottom plate facing the pressing mother plate, and an orientation guide groove for guiding and extruding the steel core to be coated is concavely provided on the surface of the pressing mother plate facing the forming bottom plate: step S105 specifically includes: placing the primary blank assembly on a forming groove of a forming bottom plate, and enabling an opening of an arc-shaped curved surface ring of the primary assembly to face a pressing mother plate and be correspondingly arranged; moving the pressing mother board towards the forming bottom board and attaching the pressing mother board to the outer wall surface of the steel core to be coated to extrude the steel core to be coated of the primary blank assembly, and pressing the arc-shaped curved ring and the steel core to be coated into the forming groove and carrying out extrusion forming; the outer wall surface of the bending part of the arc-shaped curved surface ring of the primary blank assembly is attached to the groove wall surface of the forming groove, the inner wall surface of the bending part of the arc-shaped curved surface ring is attached to the steel core to be coated, the arc-shaped curved surface is extruded and processed into a semi-circular curved surface ring which coats the steel core to be coated, and the semi-circular curved surface ring and the steel core to be coated are combined to form the intermediate-grade blank assembly.
Preferably, in order to increase the tightness of the abutment of the semicircular curved ring against the steel core to be coated and of the abutment of the semicircular curved ring against the forming groove, the curved surfaces of the forming groove and of the directional guide groove are positioned on a concentric circle in order to be loaded on the centre of the steel core to be coated inside the extrusion die.
Further, in order to make the gap between the outer wall surface of the curved portion of the arcuate curved ring of the primary blank assembly and the groove wall surface of the forming groove directly be not more than 10 mm.
As shown in fig. 3, further, the bending mold includes a feeding frame and an upper nip roller arranged oppositely in the height direction, the upper nip roller can move reciprocally in the direction of the feeding frame, a support groove for supporting the semicircular curved ring of the middle-grade blank assembly is concavely arranged on the surface of the feeding frame facing the upper nip roller, and a pressing groove for pressing the opening of the middle-grade blank assembly is concavely arranged on the surface of the upper nip roller facing the feeding frame; the bending forming die also comprises side clamping rollers which are respectively arranged at two sides of the upper clamping roller and are provided with side wall pressing surfaces, the two side clamping rollers are oppositely arranged, the two side clamping rollers synchronously move to laterally extrude and position a middle-grade blank assembly arranged on the feeding frame, and simultaneously, the extrusion necking is carried out under the auxiliary action of the upper clamping rollers; step S107 specifically includes: arranging the intermediate-grade blank assembly in a support groove of a feeding frame along the axial direction; starting the side clamping rollers to enable the two side clamping rollers to be synchronously close to the side surface of the middle-stage blank assembly to clamp and extrude, and starting the upper clamping roller to extrude and reduce the extruded middle-stage blank assembly (extruding and reducing); and then the semi-circle curved surface ring of the intermediate blank assembly is extruded to the cladding ring which is completely attached to the outer wall surface of the steel core to be clad and has an opening seam, meanwhile, the cladding ring and the steel core to be clad form an incomplete blank assembly, and the circular runout of the incomplete blank assembly is not more than 0.2 mm.
Preferably, in order to accurately control the combination gap between the semicircular curved ring of the incomplete blank assembly and the steel core to be coated, the curved surfaces of the supporting groove, the pressing groove and the side wall pressing surface are positioned on a concentric circle loaded on the center of the steel core to be coated in the bending forming die.
Further, S107 specifically includes: sealing the opening seam of the wrapping ring of the incomplete blank assembly, and then sending the opening seam into a vacuum welding machine for welding, wherein the welding current is kept at 150A during welding, and the welding speed is 80-100 mm/min, so that the target composite billet is formed after welding.
The invention provides a specific implementation mode as follows: calculating the size value of a target stainless steel plate for coating the steel core to be coated according to the size value of the steel core to be coated, wherein in the embodiment, the calculated width value of the target stainless steel plate is 470 mm, the calculated length value of the target stainless steel plate is 6 m, meanwhile, a 5 mm allowance is reserved in the width direction, a 3 mm allowance is reserved in the length direction, and the calculated target stainless steel plate is a long steel plate with a length value of 603 mm and a width value of 475; polishing the coated steel core and the target stainless steel plate: polishing and trimming the cut target stainless steel plate and the steel core to be coated, removing burrs, and milling a 30-degree groove on the target stainless steel plate; pretreatment: bending a target stainless steel plate along the axis direction by using a prebending machine so as to conveniently place a steel billet, and then putting the bent target stainless steel plate into a heating furnace to heat to 300 ℃; pretreatment: placing a target stainless steel plate heated to 300 ℃ on a production line, wherein the axis of the target stainless steel plate needs to be aligned with the center line of a mold as much as possible, placing a steel core to be coated in the bending side of the target stainless steel plate and keeping the same axis, and then fixing the steel core to be coated and the bent target stainless steel plate by spot welding; and (3) secondary extrusion: firstly, extruding a steel core to be coated and a target stainless steel plate together through a pressing mother board until the distance between the lower bottom surface of the stainless steel plate and the bottom of a groove of a die is less than 10 mm; extrusion molding: the stainless steel plate enters a bending forming die, the left part and the right part of the stainless steel plate are extruded and formed through a left clamping roller and a right clamping roller, the stainless steel plate is extruded until the stainless steel plate is completely attached to a steel billet, the circular runout of the pipe wall is ensured to be less than 0.2mm, and then the opening of the pipe barrel is closed through an extruding device above the steel billet; welding: and (3) seaming the opening of the pipe barrel and conveying the pipe barrel into a vacuum welding machine for welding, wherein the welding current is kept at 150A, and the welding speed is 80-100 mm/min.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to 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 (10)
1. The production method of the stainless steel composite billet is characterized by comprising the following steps:
s101, calculating the size value of a target stainless steel plate for coating the steel core to be coated according to the size value of the steel core to be coated;
s102, polishing and trimming the steel core to be coated and the target stainless steel plate;
s103, pre-bending the corrected target stainless steel plate to enable the target stainless steel plate to be bent in the width direction and reach a required curvature so as to form an arc-shaped curved surface ring with an opening;
s104, heating the arc-shaped curved surface ring to a target temperature;
s105, loading the steel core to be coated into the arc-shaped curved ring heated to the target temperature, fixedly connecting the steel core to be coated with the arc-shaped curved ring heated to the target temperature by adopting a spot welding fixing method, and combining the fixedly connected steel core to be coated with the arc-shaped curved ring heated to the target temperature to form a primary blank assembly;
s106, extruding the primary blank assembly through an extrusion die, so that the outer wall surface of the bent part of the arc-shaped curved surface ring of the primary blank assembly is matched with the extrusion die, the inner wall surface of the bent part of the arc-shaped curved surface ring is matched with the steel core to be coated, further, the arc-shaped curved surface is extruded and processed into a semicircular curved surface ring which coats the steel core to be coated, and the semicircular curved surface ring and the steel core to be coated are combined to form a middle-grade blank assembly;
s107, performing shaping extrusion on the intermediate blank assembly by using a bending forming die to ensure that the semicircular curved surface ring of the intermediate blank assembly is extruded to a cladding ring which is completely attached to the outer wall surface of the steel core to be clad and has an opening seam, and meanwhile, the cladding ring and the steel core to be clad form an incomplete blank assembly, and the circular runout of the incomplete blank assembly is not more than 0.2 mm;
and S108, sealing the opening seam of the covering ring of the incomplete billet assembly to form a target composite billet.
2. The method of producing a stainless steel composite billet according to claim 1,
the target stainless steel plate is in a block shape, and the step S101 specifically includes:
calculating the width value of the target stainless steel plate according to the diameter of the steel core to be coated and the thickness value of the target stainless steel plate, and reserving a machining allowance of 5 mm for the width value of the target stainless steel plate,
and calculating the length value of the target stainless steel plate according to the length value of the steel core to be coated and the thickness value of the target stainless steel plate, and reserving a machining allowance of 1-3 mm for the length value of the target stainless steel plate.
3. The method of producing a stainless steel composite billet according to claim 2,
respectively milling grooves on the side wall surfaces of two sides of the target stainless steel plate, wherein the grooves are inclined surfaces distributed along the width direction of the target stainless steel plate;
respectively polishing the upper surface and the lower surface of the target stainless steel plate and removing burrs;
and polishing the circumferential outer wall surface of the steel core to be coated and removing burrs.
4. The method of producing a stainless steel composite billet according to claim 3,
the groove is a slope of 30 to 45 degrees, and the groove is inclined outward in a direction from the upper surface to the lower surface of the target stainless steel plate.
5. The method of producing a stainless steel composite billet according to claim 1,
step S103 specifically includes: and pre-bending the corrected target stainless steel plate to ensure that the target stainless steel plate is bent along the width direction to reach the required curvature to form an arc-shaped curved ring with an opening, wherein the lower surface of the arc-shaped curved ring is in contact with the steel core to be coated when the steel core to be coated is coated by the arc-shaped curved ring, and the arc-shaped curved ring and the steel core to be coated are coaxially arranged.
6. The method of producing a stainless steel composite billet according to claim 1,
and putting the arc-shaped curved surface ring into a heating furnace to be heated to 300 ℃.
7. The method of producing a stainless steel composite billet according to claim 1,
the extrusion die comprises a forming bottom plate and a pressing mother plate which are oppositely arranged in the height direction, the pressing mother plate can move in the height direction in a reciprocating manner, the forming bottom plate faces the surface of the pressing mother plate and is concavely provided with a forming groove used for accommodating an arc-shaped curved surface ring, and the pressing mother plate faces the surface of the forming bottom plate and is concavely provided with a directional guide groove used for guiding and extruding the steel core to be coated:
step S105 specifically includes: placing the primary blank assembly on the forming groove of the forming bottom plate, and enabling an opening of an arc-shaped curved surface ring of the primary assembly to face the pressing mother plate and be correspondingly arranged; moving the pressing mother board towards the forming bottom board and attaching the pressing mother board to the outer wall surface of the steel core to be coated to extrude the steel core to be coated of the primary blank assembly, and pressing the arc-shaped curved ring and the union of the steel core to be coated into the forming groove and carrying out extrusion forming; and the outer wall surface of the bending part of the arc-shaped curved surface ring of the primary blank assembly is attached to the groove wall surface of the forming groove, the inner wall surface of the bending part of the arc-shaped curved surface ring is attached to the steel core to be coated, the arc-shaped curved surface is extruded to form a semicircular curved surface ring which coats the steel core to be coated, and the semicircular curved surface ring and the steel core to be coated are combined to form a medium-grade blank assembly.
8. The method of producing a stainless steel composite billet according to claim 7,
the gap between the outer wall surface of the curved portion of the arcuate curved ring of the primary blank assembly and the groove wall surface of the forming groove is set to be not more than 10 mm.
9. The method of producing a stainless steel composite billet according to claim 1,
the bending forming die comprises a feeding frame and an upper clamping roller which are oppositely arranged in the height direction, the upper clamping roller can move in a reciprocating manner towards the feeding frame, a supporting groove for supporting a semicircular curved ring of the middle-grade blank assembly is concavely arranged on the surface of the feeding frame facing the upper clamping roller, and a pressing groove for pressing an opening of the middle-grade blank assembly is concavely arranged on the surface of the upper clamping roller facing the feeding frame; the bending forming die also comprises side clamping rollers which are respectively arranged at two sides of the upper clamping roller and are provided with side wall pressing surfaces, the two side clamping rollers are oppositely arranged, the two side clamping rollers synchronously move to laterally extrude and position the middle-grade blank assembly arranged on the feeding frame, and meanwhile, the extrusion necking is carried out under the auxiliary action of the upper clamping roller;
step S107 specifically includes: arranging the intermediate blank assembly in the support groove of the feeding frame along the axial direction; starting the side clamping rollers to enable the two side clamping rollers to be close to the side faces of the middle-grade blank assembly to clamp and extrude the side faces, and starting the upper clamping roller to extrude and reduce the extruded middle-grade blank assembly; and then the semi-circular curved surface ring of the intermediate blank assembly is extruded to a coating ring which is completely attached to the outer wall surface of the steel core to be coated and has an opening seam, meanwhile, the coating ring and the steel core to be coated are combined to form an incomplete blank assembly, and the circular runout of the incomplete blank assembly is not more than 0.2 mm.
10. The method of producing a stainless steel composite billet according to claim 1,
s107 specifically comprises the following steps: sealing the opening seam of the wrapping ring of the incomplete blank assembly, and then sending the opening seam into a vacuum welding machine for welding, wherein the welding current is kept at 150A during welding, and the welding speed is 80-100 mm/min, so that the target composite billet is formed after welding.
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Denomination of invention: Production method of stainless steel composite billets Granted publication date: 20220415 Pledgee: China Construction Bank Co.,Ltd. Loudi branch Pledgor: HUNAN 3T NEW MATERIAL Co.,Ltd. Registration number: Y2021430000063 |