CN111203693B - Manufacturing process and production line of bimetal composite steel strip - Google Patents
Manufacturing process and production line of bimetal composite steel strip Download PDFInfo
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- CN111203693B CN111203693B CN202010063676.0A CN202010063676A CN111203693B CN 111203693 B CN111203693 B CN 111203693B CN 202010063676 A CN202010063676 A CN 202010063676A CN 111203693 B CN111203693 B CN 111203693B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 225
- 239000010959 steel Substances 0.000 title claims abstract description 225
- 239000002131 composite material Substances 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 59
- 238000000137 annealing Methods 0.000 claims abstract description 149
- 238000000227 grinding Methods 0.000 claims abstract description 104
- 238000003466 welding Methods 0.000 claims abstract description 83
- 239000002994 raw material Substances 0.000 claims abstract description 41
- 238000005096 rolling process Methods 0.000 claims abstract description 34
- 241000270295 Serpentes Species 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 58
- 230000008569 process Effects 0.000 claims description 39
- 230000006698 induction Effects 0.000 claims description 24
- 238000005498 polishing Methods 0.000 claims description 16
- 229910000997 High-speed steel Inorganic materials 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 10
- 229910000639 Spring steel Inorganic materials 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 3
- 241000610743 Psathyrotes ramosissima Species 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 16
- 239000000047 product Substances 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 8
- 238000007688 edging Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000011324 bead Substances 0.000 description 6
- 238000003801 milling Methods 0.000 description 6
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 238000009966 trimming Methods 0.000 description 4
- 238000003698 laser cutting Methods 0.000 description 3
- 238000007517 polishing process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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- 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
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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
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Abstract
The invention relates to a manufacturing process and a production line of a bimetal composite steel strip, wherein a raw material steel strip is ground by a forming grinding wheel to obtain a steel strip with at least one right-angle edge; after welding a steel wire on a right-angle edge of the steel strip, sequentially carrying out primary annealing and secondary annealing to obtain a steel strip rough blank with the weld hardness not higher than 600 HV; respectively grinding 2 surfaces of the steel belt rough blank to ensure that the thickness of the steel belt rough blank after grinding is 92-98% of the thickness of the steel belt rough blank before grinding; and rolling and straightening the rough steel strip blank to obtain a finished bimetal composite steel strip. The manufacturing process improves the production efficiency, reduces the production cost and stabilizes the product quality; in addition, the deformation problems of the turtle back, the snake bend, the knife bend and the like of the bimetal composite steel strip caused by annealing can be solved, and the precision of the bimetal composite steel strip is greatly improved.
Description
Technical Field
The invention relates to a manufacturing process and a production line of a bimetal composite steel strip, belonging to the field of band saw blade manufacturing.
Background
A bimetal composite steel strip is a composite steel strip in which high speed steel and spring steel are joined together by welding, and is generally used as a raw material for various bimetal cutting tools, such as: bimetallic band saw blade, bimetallic hole saw, bimetallic reciprocating saw, bimetallic band knife and other tools. For example, US3315548 discloses a method for manufacturing a bimetallic band saw blade starting from a high speed steel wire and a spring steel strip, wherein the processing of the bimetallic composite strip is performed by the steps of strip edging, wire trimming, degreasing the steel wire and the strip, welding, leveling, annealing, flattening, etc. In patent CN108838633B, a method for processing a bimetal composite steel strip is disclosed, in which steel wires are welded to both sides of the steel strip simultaneously, and then the bimetal composite steel strip is processed through the procedures of slitting, trimming and the like. However, in the above two patents, the bimetal composite steel strip needs to be annealed for a long time, which is mainly because the welding adopted for manufacturing the bimetal composite steel strip is high energy density welding, usually laser welding or electron beam welding, and a welding seam with a width of 0.2-0.6 mm is formed at the joint between the steel strip and the rectangular steel wire after welding, and the welding seam has the following problems: welding stress exists, and welding cracks can be formed after the welding stress is placed for a long time; secondly, the hardness of the welding seam area is very high and can reach 900HV at most, and carbides in the welding seam are in a net shape, the welding seam formed by the combination is very brittle, the welding seam of the bimetal composite steel strip is rolled subsequently, the welding seam can be processed simultaneously when a milling method is adopted for sawtooth forming, the milling cutter and the roller can be abraded too fast or even cannot be processed due to the too high hardness, and the welding seam can be cracked. Therefore, annealing is required after welding to relieve welding stress, reduce weld hardness (usually to below 400 HV), and spheroidize carbides in the structure, thereby eliminating brittleness.
Because long-time annealing is needed when the hardness of a welding seam is reduced below the required hardness, and online annealing cannot be adopted due to too long time, the existing process usually comprises the steps of coiling a welded bimetal composite steel strip and then integrally annealing. However, since the bimetal composite steel strip is annealed in a coiled shape, various deformations including transverse straightness deformation, snake bend deformation, knife bend deformation, twisting deformation and the like are inevitably generated after annealing. However, the bimetal cutting tool processed by the bimetal composite steel strip has high requirements on the size, and the tolerance requirements of transverse straightness, snake bending, knife bending, twisting and bending deformation are clearly specified in GB/T25369-2010. In the actual production of the bimetal band saw blade, the condition of scrapping caused by the fact that the size of a product is out of tolerance often occurs, and the main reason is that the deformation formed after the bimetal composite band is annealed can not be eliminated in the production of the subsequent working procedures. Therefore, if the annealing process can be cancelled or other online continuous annealing modes are adopted to replace the overall annealing of the coiled metal, the dimensional accuracy of the bimetal composite steel strip can be effectively improved, and the dimensional accuracy of the processed sawing product is further improved.
As mentioned above, the key to simplifying annealing is: the rolling procedure can have other replacement processes, and the purpose of rolling, namely eliminating weld bead bulges, is realized by adopting a non-pressure processing method; and the sawtooth forming process can adopt other processes to replace cutting processing methods such as milling and the like.
Patent US6736029B2 discloses a method for removing weld bead protrusions of a bimetal composite steel strip, which replaces rolling by grinding or grinding plus polishing. If the method of the patent is adopted to eliminate the weld bead bulge, the welding can be carried out even if the weld bead hardness is high (such as 400 HV-600 HV). Furthermore, it is pointed out in patent US6736029B2 that grinding or grinding + polishing instead of rolling also avoids the risk of weld craters forming during rolling, which weld craters would affect the weld strength and increase the risk of weld failure during use of the sawing tool being machined.
Both patent CN102145412B and patent CB104014938B disclose a method for processing sawtooth shapes by laser cutting, which can replace a milling method to realize sawtooth forming, and the laser cutting is not sensitive to weld hardness, that is, if the sawtooth forming is realized by replacing milling teeth by the laser cutting, the sawtooth forming can be carried out even if the weld hardness is high (such as 400 HV-600 HV).
Therefore, the rolling and the milling of the saw teeth have corresponding alternative processes, and the alternative processes are not sensitive to the hardness of the welding seam. Yet another problem is whether the weld hardness and weld structure after annealing will affect the weld strength after final quenching and tempering. The document "influence of annealing process on quenching and tempering hardness and sawing life of machine saw blades" (tool technology, 2001, 35 (8): 18-19) states that annealing has no significant influence on both quenching and tempering hardness and sawing life of machine saw blades. The document "study of the influence of the structure of the bimetal band saw blade on the annealing cooling mode" (welding machine, 2019, 49 (8): 99-103) states that the annealing cooling mode has no obvious influence on the structure of the bimetal band saw blade. The inventors have also found in tests that similar phenomena, quench and temper weld hardness and strength, are insensitive to annealing. Therefore, the hardness and the structure of the weld joint after annealing do not influence the strength of the weld joint after final quenching and tempering. Thus, it is possible to use a more simplified annealing process.
The traditional process flow of the existing bimetal composite steel strip is as follows: raw material steel strip-edging-welding-annealing-welding line rolling-leveling-straightening.
Wherein, the raw material steel strip is provided by a supplier and is a steel strip with required width obtained after the wide plate is cut. Such as: using 270mm wide plates, the supplier can cut 10 rolls of 26mm wide steel strip, leaving 5mm of scrap on each side to be discarded. The purpose of the beveling is to trim the edges of the steel strip. Since the raw material steel strip is a slit steel strip, the edge has deformation after shearing and burrs (see fig. 1), which cannot meet the requirement of welding in the next process, and needs to be trimmed. One side of the steel wire is usually trimmed to form a right-angle side (see fig. 2) for welding high-speed steel wires, and the other side of the steel wire is required to be chamfered (see fig. 3) to serve as a bottom edge of a final product, so that the initiation of cracks can be delayed, and the service life of the product can be prolonged. The welding is to weld the edge-chamfered steel belt and the high-speed steel wire together by adopting high-energy density welding (electron beam welding or laser welding), wherein the high-speed steel wire is welded on one side of the square edge of the steel belt. The purpose of the annealing is to eliminate welding stress at the time of welding, reduce the hardness of the weld, and simultaneously transform the structure of the weld into globular pearlite (see fig. 4). The weld flattening is to reduce the thickness of the welded composite steel strip by a certain amount by a rolling method, wherein the reduction rate is smaller and is about 2-8% of the thickness. The main reason is that the welded seam has a small projection (see fig. 5), which is not large, usually not more than 0.1mm, but which affects the subsequent processing and the use of the final product, and needs to be flattened (see fig. 6). The leveling and straightening aims to adjust the longitudinal straightness and the transverse unevenness of the steel strip and eliminate the plate shape defects such as wave bending and the like.
In summary, the existing manufacturing method of the bimetal composite steel strip has the following disadvantages:
1) the existing method for producing the bimetal composite steel strip needs a plurality of procedures to be completed, wherein the light annealing procedure needs 1 to 2 days. The production cycle is long and the production efficiency is not high.
2) The bimetal composite steel strip is placed in an annealing furnace for integral annealing in a coiled shape, the coiled shape is retained during annealing, the bimetal composite steel strip is deformed after annealing, such as transverse straightness deformation, knife bending deformation, snake bending deformation and the like, the deformation causes the dimensional accuracy of the bimetal composite steel strip to be out of tolerance, and if the bimetal composite steel strip cannot be solved in subsequent processes, the problems can be retained in a final sawing tool product, so that the product is unqualified.
3) In the existing method for manufacturing the bimetal composite steel strip, a depression is easily formed at the welding seam position in the rolling process, and the depression can have adverse effect on the welding seam strength.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a manufacturing process and a production line of a bimetal composite steel strip, so as to realize the online short-flow manufacturing of the bimetal composite steel strip.
The applicant has found that in the above-mentioned conventional process flow, if an in-line short-flow manufacturing of the bimetal composite steel strip is to be realized, the edging and annealing are bottlenecks. The adjustable range of the speed of welding is not large, but the speed of rolling and leveling can be adjusted in a large range with less influence on the product quality, so that the speed of rolling and leveling can be adapted to the speed of welding. If the bottleneck of trimming and annealing processes can be solved, the online short-flow manufacturing of the bimetal composite steel strip can be completely realized. The applicant, when studying the annealing process, found that after induction annealing was introduced, it was possible to achieve a reduction of the weld hardness to below 600HV within 2 minutes. Moreover, the annealing process can greatly reduce or even eliminate welding stress and convert the reticular structure into an intermittent shape (the reticular structure cannot be converted into a spherical shape in a short time), so the annealing process can also improve the brittleness of the welding seam to a certain extent.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a manufacturing process of a bimetal composite steel strip comprises the following steps:
s1, providing a raw material steel strip;
s2, grinding the side edge of the raw material steel strip through a forming grinding wheel to obtain a steel strip with at least one right-angle edge;
s3, welding a rectangular steel wire (namely, a steel wire with a rectangular cross section, specifically, a steel wire used in the existing composite steel strip manufacturing process can be adopted) on a right-angle edge of the steel strip obtained in the step S2, and then sequentially carrying out primary annealing and secondary annealing to obtain a steel strip rough blank with the weld hardness not higher than 600 HV; further, the weld hardness is 400-600 HV;
wherein the first annealing is induction annealing, and after the first annealing, the temperature of the steel strip is not lower than 700 ℃, and further is 700-800 ℃; during the second annealing, the annealing temperature is controlled to be 750-850 ℃, the annealing time is not less than 3min, and further 3-10 min; in the two annealing processes, the steel belt is kept in a tensioning state;
s4, grinding 2 surfaces of the steel strip rough blank obtained in the S3 respectively to ensure that the thickness of the steel strip rough blank after grinding is 92-98% of the thickness of the steel strip rough blank before grinding; or respectively and sequentially grinding and polishing 2 surfaces of the steel strip rough blank obtained in the step S3 to ensure that the thickness of the steel strip rough blank after treatment is 92-98% of the thickness of the steel strip rough blank before treatment;
and S5, rolling and straightening the rough steel strip blank processed in the S4 to obtain a finished bimetal composite steel strip.
In the present invention, grinding is used in step S2 instead of conventional edging. The traditional edge cutting process has requirements on speed, the generally adopted edge cutting speed is 60-200 m/min, and the problems of edge burrs and tearing can be caused if the speed is too low. However, the welding speed is 8-20 m/min, so the trimming speed cannot be matched with the welding speed. If grinding is adopted to replace edge cutting, the grinding speed can be changed in a large range through parameters such as the rotating speed of the formed grinding wheel, the grinding quantity of a single formed grinding wheel and the like, so that the bottleneck of the edge cutting process in the online short-process manufacturing of the bimetal composite steel strip is solved.
In step S3, the welding process may be performed according to the prior art, such as cn201811053630. x.
Alternatively, in S3, a tension is applied to the steel strip during annealing. The annealing atmosphere conditions may be selected as necessary.
Generally, the tension can be applied to the steel strip by a magnetic powder brake, and the method can be specifically carried out by referring to the prior art or the prior production line.
Preferably, in S3, the second annealing is in-line annealing, i.e. the steel strip is kept under tension through an annealing furnace.
Preferably, in S3, the time interval between the first annealing and the second annealing is not more than 10S, and further, not more than 3S. Therefore, the time interval between the first annealing and the second annealing is short, the condition that the temperature of the steel strip is reduced too much and needs to be heated again is prevented, and the annealing time can be further saved.
And S3, replacing the original integral annealing by the primary annealing and the secondary annealing, and keeping the steel strip in a tensioning state in the annealing process. The purpose of the first annealing (induction annealing) is to rapidly raise the temperature of the steel strip to the desired temperature, which greatly shortens the subsequent holding time. The temperature and time of the second annealing ensure that the welding stress of the welding seam is well eliminated, and fuse the net-shaped carbide to be in an intermittent state, so that the brittleness of the welding seam can be well improved. The bottleneck of the annealing process in the online production can be solved by adopting the first annealing and the second annealing, the annealing speed and the welding speed are matched, and the second annealing time can be controlled by the size of the annealing furnace.
In the invention, the basic principle of induction annealing is as follows: when the induction coil passes through an alternating current with a certain frequency, an alternating magnetic field is formed in the coil. If a conductive material, such as a metal material, is placed in the coil, the material will form a high density current inside the material under the action of electromagnetic induction, and the current density will be larger toward the surface. The electric energy of the high-density current on the surface layer of the workpiece is converted into heat energy under the action of the material resistance, so that the temperature of the material is increased.
Optionally, the weld hardness of the steel strip rough blank is 500-560 HV.
In S4, the grinding and polishing process can be performed by referring to US6736029B 2. In the traditional manufacturing process of the bimetal composite steel strip, integral annealing is adopted, the hardness of a welding seam after annealing is below 400HV, and rolling can be adopted for plastic deformation. However, in the invention, the hardness after annealing can reach as high as 600HV by adopting the induction annealing and the second annealing, and if rolling is adopted, on one hand, the roller can be damaged due to the overhigh hardness of the welding seam, and on the other hand, the welding seam can be cracked. Therefore, the rolling is replaced by the double-side grinding or the double-side grinding plus polishing process, so that the problems can be solved. Moreover, the speed of double-side grinding or double-side grinding plus polishing can be changed in a larger range through the rotating speed of the grinding wheel and can be completely matched with the welding speed, so that online short-flow manufacturing is realized. In addition, it is also mentioned in patent US6736029B2 that weld bead recession can be eliminated by double side grinding or double side grinding plus polishing process, thereby improving weld bead strength.
And S5, rolling straightening is adopted to replace the traditional leveling straightening (namely, the steel strip is integrally straightened, and the welding seam is also included). However, in the invention, induction annealing and online annealing are adopted, the hardness after annealing can reach 600HV at most, and if leveling and straightening are adopted, the welding seam is easy to crack. And the rolling and straightening only processes the steel strip part of the bimetal composite steel strip, and the welding seam does not bear pressure, so that the welding seam can not crack. Compared with leveling and straightening, rolling and straightening can only correct knife bending and snake bending, and wave bending, transverse bending and the like cannot be processed. However, the induction annealing and the online annealing are adopted to replace the original integral annealing, and the tension is borne in the annealing, so that the deformation of the bimetal composite steel strip in the integral annealing cannot occur in the invention, the problems of wave bending, transverse bending and the like of the steel strip cannot occur, and the rolling and straightening can completely meet the requirements.
Further, in S2, at the time of grinding treatment, the formed grinding wheels are arranged in pairs or alternately on both sides in the width direction of the raw material steel strip; the number of the formed grinding wheels on each side of the raw material steel strip is at least 2, the grinding amount of the last formed grinding wheel on the right-angle side of the raw material steel strip is less than 0.1mm when viewed along the moving direction of the raw material steel strip, and the grinding amount of other formed grinding wheels on the right-angle side of the raw material steel strip is less than 0.2 mm.
Further, in S2, the steel strip has a right-angled edge and a chamfered edge; during grinding treatment, the last formed grinding wheel corresponding to the chamfer edge only processes the chamfer, and the grinding amount of other formed grinding wheels at the edge is less than 0.2 mm.
Optionally, the shape of the chamfer edge may be a rounded corner or a chamfer of 45 degrees, and optionally, the width of the chamfer is 0.1-0.3 mm.
Further, before S3, a step of cleaning the steel strip and the steel wire is further included.
Further, in S3, the welding method is laser welding.
Further, in S3, the steel strip passes through the induction coil to perform induction annealing.
Further, in S4, the grinding process is performed by a grinding wheel.
Further, the raw material steel strip is made of spring steel.
Further, the steel wire is made of high speed steel.
The invention adopts induction annealing and secondary annealing to replace integral annealing, adopts edging to replace edging, adopts double-sided grinding to replace rolling, and carries out online production of a plurality of processes of edging, cleaning, welding, annealing, double-sided grinding and the like, thereby realizing online short-flow manufacturing of the bimetal composite steel strip. The method for manufacturing the bimetal composite steel strip in the online short process improves the production efficiency, reduces the production cost and stabilizes the product quality; in addition, the deformation problems of the turtle back, the snake bend, the knife bend and the like of the bimetal composite steel strip caused by annealing can be solved, and the precision of the bimetal composite steel strip is greatly improved.
Based on the same invention concept, the invention also provides a production line of the bimetal composite steel strip, which comprises
The grinding unit is used for grinding the raw material steel strip to obtain a steel strip with at least one right-angle side;
the welding unit is used for welding the steel wire to the right-angle side of the steel belt;
the first annealing unit is used for rapidly heating the steel strip to a target temperature and carrying out first annealing on the steel strip;
the second annealing unit is used for carrying out secondary annealing on the steel strip to obtain a steel strip rough blank;
the grinding/polishing unit is used for respectively grinding and/or polishing 2 surfaces of the steel belt rough blank;
the rolling and straightening unit is used for rolling and straightening the rough steel strip blank to form a finished bimetal composite steel strip product;
the device comprises a grinding unit, a welding unit, a first annealing unit, a second annealing unit, a grinding/polishing unit and a rolling straightening unit, wherein the grinding unit, the welding unit, the first annealing unit, the second annealing unit, the grinding/polishing unit and the rolling straightening unit are sequentially arranged in the output direction from the input of a raw material steel strip to a bimetal composite steel strip.
Compared with the prior art, the invention has the following beneficial effects:
1) the process flow is short, the processing cycle is short, the production of the bimetal composite steel strip can be completed through one production line, and the production efficiency is high.
2) The online production is easy to realize, and a large amount of processes of feeding, blanking and material transferring are omitted.
3) Each meter of the bimetal composite steel strip is queued to enter a production line, and the quality stability of the product is greatly improved.
4) The problems of transverse bending, wave bending, snake bending, knife bending out-of-tolerance and the like of the bimetal composite steel strip are solved.
5) The problem of weld seam sinking is solved.
Drawings
FIG. 1 is a schematic view showing a cross-sectional structure of a raw material steel strip before edging.
FIG. 2 is a schematic view showing the cross-sectional structure of the right-angle side after the edge cutting of the raw material steel strip (2 pieces of raw material steel strip are involved).
FIG. 3 is a schematic cross-sectional view of a chamfered side of a steel strip as a raw material after the chamfering.
Fig. 4 is a sectional SEM picture (left) after welding and a sectional SEM picture after annealing of the raw material steel strip and the high speed steel.
FIG. 5 is a sectional view showing the structure of a raw material steel strip and a high-speed steel strip after they are combined and before the weld is flattened (2 raw material steel strips are referred to).
FIG. 6 is a sectional view showing a flattened weld after the combination of a raw material steel strip and a high speed steel.
Fig. 7 is a flow chart of a process for manufacturing a bimetallic composite steel strip in accordance with the present invention.
Fig. 8 is a schematic view (in a plan view) of the structure of the second annealing unit in the manufacturing process of the present invention.
Fig. 9 is a schematic view (side view direction) of the structure of the second annealing unit in the manufacturing process of the present invention.
FIG. 10 is a metallographic image of a cross section of a weld after annealing.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 7, a manufacturing process of a bimetal composite steel strip includes the following steps:
s1, providing a raw material steel strip;
s2, grinding the raw material steel strip through a forming grinding wheel to obtain a steel strip with a right-angled edge and a chamfered edge;
s3, welding a rectangular steel wire on a right-angle edge of the steel strip obtained in the step S2, and then sequentially carrying out primary annealing and secondary annealing to obtain a steel strip rough blank with the weld hardness not higher than 600 HV;
wherein the first annealing is induction annealing, and the temperature of the steel strip is not lower than 750 ℃ after the first annealing; during the second annealing, the annealing temperature is controlled to be 800-820 ℃, and the annealing time is 6 min; in the two annealing processes, the steel belt is kept in a tensioning state;
s4, grinding 2 surfaces of the steel strip rough blank obtained in the S3 respectively to enable the thickness of the steel strip rough blank after grinding to be 96% of the thickness of the steel strip rough blank before grinding; or, grinding and polishing 2 surfaces of the steel strip rough blank obtained in the step S3 in sequence respectively so that the thickness of the steel strip rough blank after treatment is 96% of the thickness of the steel strip rough blank before treatment;
and S5, rolling and straightening the rough steel strip blank processed in the S4 to obtain a finished bimetal composite steel strip.
In S2, when grinding, the formed grinding wheels are arranged on two sides of the width direction of the raw material steel strip in pairs or alternatively, wherein one side is a right-angle side, and the other side is a chamfer side; the number of the formed grinding wheels on each side of the raw material steel strip is 4, the grinding amount of the last formed grinding wheel on the right-angle side of the raw material steel strip is 0.05-0.08mm when viewed along the moving direction of the raw material steel strip, and the grinding amount of other formed grinding wheels on the side is less than 0.2 mm.
In S2, during the grinding process, the last formed grinding wheel corresponding to the chamfered edge is used to process only the chamfered edge, and the grinding amount of the other formed grinding wheels is less than 0.2 mm.
Before S3, the method further comprises the step of cleaning the steel strip and the steel wire.
In S3, the welding method is laser welding.
In S3, the steel strip is passed through an induction coil to effect induction annealing.
In S4, the grinding process is performed by a grinding wheel.
The raw material steel strip is made of spring steel. The steel wire is made of high speed steel.
A production line of a bimetal composite steel strip comprises
The grinding unit 5 is used for grinding the raw material steel strip to obtain a steel strip with at least one right-angle side;
the cleaning unit 6 is used for cleaning the steel belt and the rectangular steel wire;
a welding unit 7 for welding the rectangular steel wire to the right-angled side of the steel strip;
the first annealing unit 8 is used for rapidly heating the steel strip to a target temperature and carrying out first annealing on the steel strip;
the second annealing unit 9 is used for annealing the steel strip for the second time to obtain a steel strip rough blank;
a grinding/polishing unit 10 for respectively grinding and/or polishing 2 surfaces of the steel strip rough blank;
the rolling straightening unit 11 is used for rolling and straightening the steel strip rough blank to form a finished product of the bimetal composite steel strip;
the grinding unit 5, the cleaning unit 6, the welding unit 7, the first annealing unit 8, the second annealing unit 9, the grinding/polishing unit 10 and the rolling straightening unit 11 are sequentially arranged according to the output direction of the raw material steel strip input to the bimetal composite steel strip.
The cleaning unit 6 may be referred to as a cleaning unit on an existing production line, and generally includes cleaning, rinsing, and drying functions.
The first annealing unit is an induction annealing unit, an induction coil is arranged in the first annealing unit, and the steel strip is rapidly heated in the process of passing through the induction coil.
Referring to fig. 8 and 9, the second annealing unit includes a furnace body 1, two rows of guide posts 2 are arranged in the furnace body 1, the steel strip in the furnace body 1 sequentially bypasses each guide post 2 and is arranged in a serpentine shape in the furnace body 1, so that on-line annealing can be realized (the process that each section of the steel strip enters the furnace body 1 and bypasses each guide post 2 and then comes out of the furnace body 1 is the second annealing process); a plurality of thermocouples 3 are arranged in the furnace body 1 and distributed around the position where the steel strip passes in the furnace body 1, so that the annealing temperature can be conveniently controlled. Optionally, the annealing furnace is a resistance furnace.
The distance from the material discharging end to the material receiving end is about 100-150 m. In the production process, the moving speed of the bimetal composite steel strip is determined by welding, and the speeds of stations in other working procedures are matched with the welding speed. If calculated according to the distance of 150m, 8 rolls of the bimetal composite steel strip with the length of 500m and the specification of 27 x 0.9 are processed, the welding speed is 15m/min, and if the feeding and discharging time is calculated, the production time is shortened to be within 6 hours. The existing processing technology at least needs more than 72 hours, and the production efficiency of the invention has obvious advantages.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (6)
1. The on-line manufacturing process of the bimetal composite steel strip is characterized by comprising the following steps:
s1, providing a raw material steel strip;
s2, grinding the side edge of the raw material steel strip through a forming grinding wheel to obtain a steel strip with at least one right-angle edge;
wherein, during the grinding treatment, the formed grinding wheels are arranged on two sides of the width direction of the raw material steel strip in pairs or alternatively; the number of the formed grinding wheels on each side of the raw material steel strip is at least 2, the grinding amount of the last formed grinding wheel on the right-angle side of the raw material steel strip is less than 0.1mm when viewed along the moving direction of the raw material steel strip, and the grinding amount of other formed grinding wheels on the side is less than 0.2 mm;
s3, welding a rectangular steel wire on a right-angle edge of the steel strip obtained in the step S2, and then sequentially carrying out primary annealing and secondary annealing to obtain a steel strip rough blank with the weld hardness of 500-600 HV;
wherein the first annealing is induction annealing, and the temperature of the steel strip is not lower than 700 ℃ after the first annealing; the steel strip passes through the induction coil to realize induction annealing; during the second annealing, the annealing temperature is controlled to be 750-850 ℃, and the annealing time is not less than 3 min; in the two annealing processes, the steel belt is kept in a tensioning state; the second annealing is online annealing; the time interval between the first annealing and the second annealing is not more than 10 s; matching the grinding processing speed with the welding speed in S2;
s4, grinding 2 surfaces of the steel strip rough blank obtained in the S3 respectively to ensure that the thickness of the steel strip rough blank after grinding is 92-98% of the thickness of the steel strip rough blank before grinding; or respectively and sequentially grinding and polishing 2 surfaces of the steel strip rough blank obtained in the step S3 to ensure that the thickness of the steel strip rough blank after treatment is 92-98% of the thickness of the steel strip rough blank before treatment;
wherein the grinding treatment is carried out by a grinding wheel; the grinding speed and the welding speed in the S4 are matched;
s5, rolling and straightening the steel strip rough blank processed in the S4 to obtain a finished product of the bimetal composite steel strip;
when rolling and straightening are carried out, only the steel strip part of the bimetal composite steel strip is processed, and a welding seam does not bear pressure.
2. The on-line manufacturing process according to claim 1, wherein in S2, the steel strip has a right-angled edge and a chamfered edge; during grinding treatment, the last formed grinding wheel corresponding to the chamfer edge only processes the chamfer, and the grinding amount of other formed grinding wheels at the edge is less than 0.2 mm.
3. The on-line manufacturing process as claimed in claim 1, wherein the step of cleaning the steel strip and the steel wire is further included before S3.
4. The in-line manufacturing process of claim 1, wherein in S3, the welding mode is laser welding.
5. The on-line manufacturing process according to any one of claims 1 to 4, wherein the raw-material steel strip is made of spring steel; the rectangular wire is made of high-speed steel.
6. A production line of a bimetal composite steel strip is characterized by comprising
A grinding unit (5) for grinding the side edges of the strip of raw material to obtain a strip having at least one right-angled edge;
a welding unit (7) for welding the rectangular steel wire to the right-angled side of the steel strip;
the first annealing unit (8) is used for rapidly heating the steel strip to a target temperature and annealing the steel strip for the first time;
the second annealing unit (9) is used for annealing the steel strip for the second time to obtain a steel strip rough blank;
a grinding/polishing unit (10) for respectively grinding and/or polishing 2 surfaces of the steel strip rough blank;
the rolling straightening unit (11) is used for rolling and straightening the steel strip part of the steel strip rough blank to form a finished product of the bimetal composite steel strip;
the device comprises a grinding unit (5), a welding unit (7), a first annealing unit (8), a second annealing unit (9), a grinding/polishing unit (10) and a rolling straightening unit (11), wherein the grinding unit, the welding unit, the first annealing unit (8), the second annealing unit and the rolling straightening unit are sequentially arranged in the output direction of a raw material steel strip from the input to a bimetal composite steel strip; the first annealing unit is an induction annealing unit, an induction coil is arranged in the first annealing unit, and the steel strip is rapidly heated in the process of passing through the induction coil to realize induction annealing; the second annealing unit comprises a furnace body (1), two rows of guide columns (2) are arranged in the furnace body (1), the steel belt positioned in the furnace body (1) bypasses all the guide columns (2) in sequence, and the steel belt is distributed in a snake shape in the furnace body (1) to realize online annealing.
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