Band saw blade manufacturing method and band saw blade

Abstract

The invention relates to the technical field of saw blade manufacturing, and discloses a band saw blade manufacturing method and a band saw blade. Step S2, tooth shape forming; s3, heat treatment strengthening; s4, composite straightening is carried out; s5, high-frequency welding is conducted; step S6, rolling and strengthening in different areas; s7, self-adaptive finish machining is carried out; step S8, closed-loop quality regulation and control; the saw tooth part is formed by brazing a hard alloy tool bit on a tooth support, and the multiple parallel rolling belts are formed by rolling and strengthening in different areas. The number and the width of rolling areas are dynamically configured according to the width of the band saw blade through matching of partitioned rolling strengthening and self-adaptive finish machining, reasonable isolation areas are arranged between adjacent rolling belts, local strengthening is achieved, and the bending strength and the fatigue resistance of tooth roots are enhanced; a process route is selected according to tooth pitches, rolling strengthening is conducted firstly, then tooth grinding is conducted, or tooth grinding is conducted firstly, then rolling is conducted, and the safe distance between a roller working area and a tooth root is reasonably controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of saw blade manufacturing, in particular to a band saw blade manufacturing method and a band saw blade. Background Art

[0002] Bimetallic band saw blades are widely used in the field of metal and non-metallic cutting. Due to changes in market and customer demand, customers' requirements for sawing efficiency and sawing life are constantly increasing. Generally, the manufacturing process route of existing high-speed sawing bimetallic band saw blades generally includes edge trimming, leveling and straightening, fixed-length material preparation, tooth milling, heat treatment, one-stage roller straightening, blade welding, tooth grinding, two-stage roller straightening and other processes.

[0003] During the research and development and implementation of the band saw blade manufacturing process, it was found that for band saw blades of different specifications, there were no clear setting rules for the number, position and size of the rolling areas, which could easily lead to uneven improvement in the rigidity of the backing material and even cause local stress concentration, affecting the sawing performance and life; there was also a contradiction between the order of the rolling treatment and the tooth grinding process. Rolling first and then grinding would interfere with the tooth grinding accuracy, while grinding first and then rolling might damage the tooth tip. Based on this, the present invention designed a band saw blade manufacturing method to solve the above problems. Summary of the Invention

[0004] The object of the present invention is to provide a band saw blade manufacturing method and a band saw blade, which solve the problems in the background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A method for manufacturing a band saw blade comprises the following steps: Step S1: precision edge trimming, using a double-disc vertical edge trimming machine to simultaneously process the two edges of the raw steel strip in the thickness direction to form right-angled edges with a verticality of ≤0.05mm; Step S2, tooth profile forming: the steel strip is straightened to a flatness of ≤0.15 mm / m by a seven-roll straightening unit, and then a forming milling cutter is used to mill equidistant tooth supports on the continuously fed steel strip; Step S3, heat treatment strengthening, quenching and tempering treatment is performed in a protective atmosphere continuous furnace, and rapid cooling is performed at a cooling rate of ≥80°C / s after quenching; Step S4: composite straightening, firstly using a roller straightening machine to eliminate macro deformation, then using a planetary surface grinder to perform precision grinding on the back of the strip, controlling the bottom edge S-bend to ≤0.08mm / 450mm; Step S5, high-frequency welding, brazing the carbide tip to the tooth holder by high-frequency induction heating to form a rough band saw blade; Step S6: Zoning roller strengthening, dynamically configuring the roller zone according to the width of the band saw blade: when the band width W is less than or equal to 30 mm, three parallel roller zones are set between the tooth groove and the bottom edge; when 30 mm < W < 50 mm, four parallel roller zones are set; when W is greater than or equal to 50 mm, five parallel roller zones are set; the roller zone width is (0.06-0.08) W, and an isolation zone with a width of ≥ 1.2 times the roller zone width is reserved between adjacent roller zones; Step S7, adaptive finishing, select the process route according to the tooth pitch: when the tooth pitch P≤4.0mm, first roll-hardening and then diamond grinding; when the tooth pitch P>4.0mm, first grind and then roll, and maintain a safety distance ≥(P+0.5mm) between the roller working area and the tooth root.

[0006] Preferably, the heat treatment process in step S3 comprises the following steps: step S3.1, quenching at 1020-1040°C for 3-4 minutes, and cooling by spraying with a PAG aqueous solution; Step S3.2: Tempering process is carried out in stages at 620-640°C, with a total duration of ≥8 minutes.

[0007] The above technical solution shows that: during the tooth profile forming stage, the seven-roller straightening unit first corrects the flatness of the steel strip to achieve micron-level flatness, ensuring that the steel strip maintains a stable shape during subsequent processing. Subsequently, the forming milling cutter mills equidistant tooth supports on the continuously fed steel strip. The heat treatment strengthening process is the key link. The quenching and tempering treatment is carried out in a continuous furnace with a protective atmosphere. During quenching, rapid cooling causes the internal structure of the steel strip to transform, obtaining a high-hardness martensite structure. During tempering, the structure is tempered and sorbitized by segmented heat preservation, eliminating quenching stress. Preferably, the composite straightening process of step S4 comprises the following steps: step S4.1, back grinding adopts cross-axis grinding method, and the feed amount of grinding wheel per stroke is ≤0.005mm; Step S4.2: The surface roughness of the belt after grinding is Ra≤0.4μm.

[0008] The above technical solution shows that during compound straightening, the roller straightening machine first eliminates macroscopic deformation and performs preliminary correction on the overall shape of the band saw blade; then the planetary surface grinder performs precision grinding on the back of the strip, using the cross-axis grinding method to strictly control the feed rate of the grinding wheel per stroke to achieve high-precision back grinding, control the S-bend of the bottom edge within a very small range, and further improve the flatness and geometric accuracy of the band saw blade.

[0009] Preferably, the rolling process of step S6 comprises the following steps: step S6.1, rolling line pressure is 1.8-2.2 MPa, and the roller surface is hard chrome plated with a hardness ≥HRC62; Step S6.2: During rolling, the band saw blade runs at a speed of 15-25 m / min, and the tension is controlled to be 15%-20% of the yield strength.

[0010] Preferably, the step S6 further comprises polishing the bottom edge, comprising the following steps: step S6.3, using a floating belt polisher to perform mirror finishing on the bottom edge, with a polishing contact pressure of 0.5-1.0 N / mm²; Step S6.4: Surface roughness testing is performed to ensure that the surface roughness Ra after polishing is less than or equal to 0.1 μm.

[0011] Preferably, the zoned rolling in step S6 specifically includes: the center line of the first rolled belt is 2.4-2.6 mm away from the tooth groove, and the center line of the last rolled belt is 2.4-2.6 mm away from the bottom edge; Deviation between the center line of the middle roller belt and the tooth groove-bottom edge bisecting plane ≤±0.2mm; A differential roller pressing system is used, with the diameter of the middle roller being 0.08-0.12mm larger than that of the edge rollers.

[0012] The above technical solution demonstrates that zoned roll strengthening dynamically allocates rolling zones based on the width of the bandsaw blade. Different widths correspond to varying numbers of parallel roll zones, and appropriate isolation zones are established between adjacent roll zones. Precise control of parameters such as the rolling line pressure, roller surface treatment, and the blade's operating speed during rolling strengthens the blade in localized areas, enhancing the bending strength and fatigue resistance of key areas such as the tooth roots.

[0013] Preferably, the process of first grinding the teeth and then rolling the teeth in step S7 comprises the following steps: step S7.1, a cup-shaped diamond grinding wheel is used in the gear grinding process, and the axial swing amplitude of the grinding wheel is ≤0.05 mm; In step S7.2, the minimum distance between the rolling area boundary and the tooth groove is controlled to be max(2.5mm, 0.1W).

[0014] Preferably, the method further includes step S8, closed-loop quality control, wherein an online laser scanner monitors the S-bend value after rolling in real time. If the S-bend value is greater than 0.10 mm / 450 mm, a pressure supplementation program is triggered to increase the rolling pressure by 30%-50% for secondary rolling. The step S8 also includes a re-pressing procedure, including the following steps: step S8.1, the number of re-pressing times shall not exceed 2 times, and the rolling speed shall be reduced by 20%-30% each time; step S8.2, if the S-bend is still greater than 0.10mm / 450mm after re-pressing, it shall be automatically sorted as a defective product.

[0015] Preferably, the quenching process in step S3 adopts a multi-stage cooling method: after keeping warm at the quenching temperature, first quickly cool to 300-400°C at a cooling rate of ≥60°C / s, then transfer to a pre-cooling zone with a temperature of 200-300°C and slowly cool at a cooling rate of 10-20°C / s.

[0016] According to a second aspect of the present invention, a band saw blade as described above is also provided, comprising: The band saw blade manufacturing method realizes a saw tooth portion formed by brazing a carbide cutter head to a tooth support and a multi-pass parallel rolled band formed by partitioned rolling strengthening.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention combines zoned rolling strengthening with adaptive finishing, dynamically configures the number and width of rolling areas according to the width of the band saw blade, and sets reasonable isolation areas between adjacent rolling bands to achieve local strengthening and enhance the bending strength and fatigue resistance of the tooth root. The process route is selected according to the tooth pitch, and rolling strengthening is performed first and then grinding, or grinding is performed first and then rolling. The safe distance between the roller working area and the tooth root is reasonably controlled to avoid tooth root damage, ensure tooth integrity and cutting performance, and optimize the overall performance of the saw blade.

[0018] 2. The present invention uses a double-disc vertical edge trimming machine to simultaneously process both sides of the steel strip through the coordination of precision edge trimming and tooth profile forming, forming highly vertical right-angled edges, providing a regular initial shape for subsequent processes; after the seven-roller straightening unit corrects the flatness, the forming milling cutter mills out equidistant tooth supports, ensuring the flatness of the steel strip and the uniformity of the tooth supports, improving production efficiency and precision, and laying the foundation for the manufacture of high-quality saw blades.

[0019] 3. The present invention combines heat treatment strengthening with composite straightening, and the quenching-tempering treatment enables the steel strip to obtain high-hardness martensite and tempered sorbite structures, thereby eliminating quenching stress. After the roller straightening machine eliminates macroscopic deformation, the planetary surface grinder uses the cross-axis grinding method to precisely grind the back, strictly controlling the grinding wheel feed rate and controlling the S-bend of the bottom edge within a very small range, thereby improving the flatness and geometric accuracy of the band saw blade and enhancing its cutting performance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Create an overall flow chart for band saw blade manufacturing; Figure 2 Detailed flow chart for heat treatment enhancement; Figure 3 It is a detailed flow chart of zoned roller strengthening; Figure 4 Detailed flow chart of adaptive finishing. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Example 1

[0023] See also Figures 1-4 In an embodiment of the present invention, a method for manufacturing a band saw blade includes the following steps: Step S1: precision edge trimming, using a double-disc vertical edge trimming machine to simultaneously process the two edges of the raw steel strip in the thickness direction to form right-angled edges with a verticality of ≤0.05mm; Step S2, tooth profile forming: the steel strip is straightened to a flatness of ≤0.15 mm / m by a seven-roll straightening unit, and then a forming milling cutter is used to mill equidistant tooth supports on the continuously fed steel strip; Step S3, heat treatment strengthening, quenching and tempering treatment is performed in a protective atmosphere continuous furnace, and rapid cooling is performed at a cooling rate of ≥80°C / s after quenching; Step S4: composite straightening, firstly using a roller straightening machine to eliminate macro deformation, then using a planetary surface grinder to perform precision grinding on the back of the strip, controlling the bottom edge S-bend to ≤0.08mm / 450mm; Step S5, high-frequency welding, brazing the carbide tip to the tooth holder by high-frequency induction heating to form a rough band saw blade; Step S6: Zoning roller strengthening, dynamically configuring the roller zone according to the width of the band saw blade: when the band width W is less than or equal to 30 mm, three parallel roller zones are set between the tooth groove and the bottom edge; when 30 mm < W < 50 mm, four parallel roller zones are set; when W is greater than or equal to 50 mm, five parallel roller zones are set; the roller zone width is (0.06-0.08) W, and an isolation zone with a width of ≥ 1.2 times the roller zone width is reserved between adjacent roller zones; Step S7, adaptive finishing, select the process route according to the tooth pitch: when the tooth pitch P≤4.0mm, first roll-hardening and then diamond grinding; when the tooth pitch P>4.0mm, first grind and then roll, and maintain a safety distance ≥(P+0.5mm) between the roller working area and the tooth root.

[0024] The heat treatment process in step S3 includes the following steps: step S3.1, quenching at a temperature of 1020-1040°C for 3-4 minutes, followed by cooling with a PAG aqueous solution spray; step S3.2, tempering at 620-640°C in stages, with a total duration of ≥8 minutes. The composite straightening process in step S4 includes the following steps: step S4.1, back grinding using a cross-axis grinding method, with a grinding wheel feed rate of ≤0.005mm per stroke; step S4.2, ensuring the surface roughness of the strip after grinding is Ra ≤0.4μm. The rolling process in step S6 includes the following steps: step S6.1, rolling line pressure of 1.8-2.2MPa, with the roller surface hardened with chrome plating to a hardness of ≥HRC62; step S6.2, operating the band saw blade at a speed of 15-25m / min during rolling, with the tension controlled to 15%-20% of the yield strength. Step S6 also includes bottom edge polishing, including the following steps: step S6.3, using a floating belt polisher to perform mirror finishing on the bottom edge with a polishing contact pressure of 0.5-1.0N / mm²; step S6.4, performing surface roughness testing to ensure that the surface roughness Ra after polishing is ≤0.1μm.

[0025] The working principle of the embodiment of the present invention is as follows: During the manufacturing process of band saw blades, each step achieves efficient and accurate production of band saw blades. During the precision edge trimming process, a double-disc vertical edge trimming machine simultaneously processes both sides of the raw steel strip, forming highly vertical right-angled edges, providing a regular initial shape for subsequent processes.

[0026] During the tooth profile forming stage, a straightening unit first flattens the steel strip to micron-level accuracy, ensuring a stable shape during subsequent processing. The forming milling cutter then mills equidistant tooth supports onto the continuously fed strip. Quenching and tempering are performed in a continuous furnace with a protective atmosphere. During quenching, rapid cooling transforms the internal structure of the steel strip, resulting in a high-hardness martensitic structure. Tempering, through staged heat retention, tempers the structure into a sorbite structure, eliminating quenching stresses.

[0027] During compound straightening, the roller straightening machine first eliminates macro deformation and performs preliminary correction on the overall shape of the band saw blade; then the planetary surface grinder performs precision grinding on the back of the strip, using the cross-axis grinding method to strictly control the feed amount of each stroke of the grinding wheel to achieve high-precision back grinding, and control the S-bend of the bottom edge within a very small range, further improving the flatness and geometric accuracy of the band saw blade.

[0028] High-frequency welding utilizes high-frequency induction heating to precisely braze carbide tips to the tooth carrier, creating a rough band saw blade. Its rapid heating rate and minimal heat-affected zone ensure a secure bond between the tip and the steel strip, providing a reliable structural foundation for subsequent tooth strengthening and finishing.

[0029] Zoned roller strengthening dynamically configures the rolling zone based on the width of the bandsaw blade. Different widths correspond to different numbers of parallel rollers, and appropriate isolation zones are set between adjacent rollers. Precise control of parameters such as rolling line pressure, roller surface treatment, and blade speed during rolling strengthens the bandsaw blade in localized areas, enhancing the bending strength and fatigue resistance of key areas such as the tooth root.

[0030] Adaptive finishing processes select different process paths based on tooth pitch. For smaller pitches, rolling and strengthening are performed first, followed by grinding, effectively improving tooth hardness and wear resistance. For larger pitches, grinding is performed first, followed by rolling, ensuring tooth profile accuracy and strengthening the tooth root. A safe distance between the roller working area and the tooth root prevents damage during machining, ensuring tooth integrity and cutting performance.

[0031] Example 2

[0032] See also Figures 1-4 In this embodiment of the present invention, the zoned rolling process in step S6 specifically includes: the centerline of the first rolled belt is 2.4-2.6mm from the tooth groove, and the centerline of the last rolled belt is 2.4-2.6mm from the bottom edge; the deviation between the centerline of the intermediate rolled belt and the tooth groove-bottom edge bisector is ≤±0.2mm; a differential rolling system is used, and the diameter of the intermediate roller is 0.08-0.12mm larger than that of the edge rollers. The tooth grinding-before-rolling process in step S7 includes the following steps: step S7.1, the tooth grinding process uses a cup-shaped diamond grinding wheel with an axial swing amplitude of ≤0.05mm; step S7.2, the minimum distance between the rolling zone boundary and the tooth groove is controlled to max(2.5mm, 0.1W).

[0033] The system also includes step S8, a closed-loop quality control process. An online laser scanner monitors the S-bend value after rolling in real time. If it exceeds 0.10mm / 450mm, a re-rolling procedure is triggered, increasing the rolling pressure by 30%-50% for a second rolling. Step S8 also includes a re-rolling procedure, including the following steps: Step S8.1: The number of re-rolling attempts shall not exceed two, with the rolling speed reduced by 20%-30% each time; Step S8.2: If the S-bend value after re-rolling is still greater than 0.10mm / 450mm, the product is automatically sorted as defective. The quenching process in step S3 utilizes a multi-stage cooling method: after holding at the quenching temperature, the product is first rapidly cooled to 300-400°C at a cooling rate of ≥60°C / s, then transferred to a pre-cooling zone at 200-300°C and slowly cooled at a cooling rate of 10-20°C / s.

[0034] A band saw blade is manufactured by a method for manufacturing a band saw blade, wherein a carbide cutter head is brazed to a tooth support to form a saw tooth portion, and a plurality of parallel rolled belts are formed by zoned rolling strengthening.

[0035] The working principle of the embodiment of the present invention is: partitioned rolling link, by precisely adjusting the position of the rolling belt, the center lines of the first and last rolling belts maintain a constant distance of 2.4-2.6mm from the tooth groove and the bottom edge respectively, and the deviation between the center line of the middle rolling belt and the tooth groove-bottom edge bisector is controlled within ±0.2mm. With the help of the differential rolling system, that is, the diameter of the middle roller is 0.08-0.12mm larger than that of the edge roller, local strengthening is achieved while avoiding stress concentration, effectively improving the bending strength and fatigue resistance of the saw blade.

[0036] In the process of grinding teeth first and then rolling, the axial swing amplitude of the cup-shaped diamond grinding wheel is ≤0.05mm to ensure tooth profile accuracy, and the minimum distance between the boundary of the rolling area and the tooth groove is controlled to max (2.5mm, 0.1W) to ensure the balance between tooth root strength and cutting performance.

[0037] During closed-loop quality control, the online laser scanner monitors the S-bend value in real time in a non-contact manner. When the S-bend is greater than 0.10mm / 450mm, the rolling pressure is increased by 30%-50% through the pressure-replenishing program (the number of pressure-replenishing times does not exceed 2 times, and the rolling speed is reduced by 20%-30% each time) for secondary rolling. If the product is still unqualified after pressure-replenishing, it will be automatically sorted to realize intelligent quality control of the manufacturing process.

[0038] The quenching adopts multi-stage cooling, firstly rapidly cooling to 300-400℃ at ≥60℃ / s, and then transferring to the pre-cooling zone for slow cooling at 10-20℃ / s to optimize the metallographic structure, so that the quenching hardness and tempering toughness achieve the best match, and improve the comprehensive mechanical properties of the band saw blade.

[0039] Example 3

[0040] See also Figures 1-4 In this embodiment, a bimetallic band saw blade with a bandwidth of 41mm and a tooth pitch of 3.5mm is used as the processing object. First, a double-disc vertical edge trimming machine is used to precisely trim the thickness of the 1.33mm thick spring steel raw material strip on both sides to form a right-angle edge with a verticality of 0.03mm. Subsequently, the flatness of the steel strip is corrected to 0.10mm / m by a seven-roller straightening unit, and a carbide forming milling cutter is used to mill out equidistant tooth supports with a depth of 0.65mm on the continuously fed steel strip. The heat treatment process is carried out in a nitrogen-protected continuous furnace, quenching and holding at 1030°C for 3.5 minutes and cooling at a rate of 85°C / s, followed by segmented tempering: holding at 625°C for 3 minutes, holding at 635°C for 5 minutes, for a total of 8 minutes. The hardness after treatment reaches 455HV.

[0041] During the straightening phase, the strips are first straightened using a nine-roller straightening machine to eliminate macroscopic deformation. Cross-axis grinding is then performed on the back of the strips using a planetary grinder with a 500-grit diamond wheel and a single-stroke feed of 0.004mm. The resulting strips have an S-curve of 0.06mm / 450mm at the bottom edge and a surface roughness of Ra 0.35μm. The H10F carbide tips are brazed to the tooth holders at 980°C using high-frequency induction heating to form the rough band saw blades.

[0042] During the roller-pressing stage, four parallel roller belts were set up, each with a 2.87mm belt width, based on a 41mm belt width. A 3.50mm gap was maintained between adjacent belts. The center of the first roller belt was 2.5mm from the tooth groove, the last from the base edge, and the center of the middle belt was 0.15mm away from the tooth groove-base bisector. A differential roller system was used, with the diameter of the middle roller 0.10mm larger than that of the edge rollers. Rolling was completed under a line pressure of 2.0MPa and a belt speed of 20m / min. The base edge was then mirror-finished using a floating belt polisher to achieve a Ra 0.09μm surface finish. Due to the tooth pitch threshold of 3.5mm to 4.0mm, a rolling-first, then grinding process was employed: grinding was performed using a cup-shaped diamond grinding wheel with an axial oscillation amplitude of 0.04mm and a grinding depth of 25% of the cutter head height, resulting in a 0.05mm radius at the tooth tip.

[0043] Online laser scanning showed that the S-bend value of the finished product was 0.09mm / 450mm, the threshold was 0.10mm, and the pressure replenishment program was not triggered. Finally, the band saw blade had no abnormal jitter when sawing a 250mm aluminum bar at a linear speed of 2800m / min, the cutting noise was ≤45dB(A), and the service life reached 55m² / meter of cutting area, which is 42% higher than the traditional process.

[0044] Working principle: Efficient and precise production is achieved through close coordination of each step. Precision edge cutting and tooth forming provide regular shapes and precise tooth supports for subsequent processing. Heat treatment strengthening optimizes the metallographic structure of the steel strip through quenching and tempering to improve hardness and toughness. Composite straightening eliminates macro deformation and precision grinds the back to improve flatness. High-frequency welding firmly bonds the cutter head to the tooth support. Partitioned rolling strengthening is dynamically adjusted according to the bandwidth to enhance the strength of key parts. Adaptive finishing selects the process route according to the tooth pitch to ensure tooth performance. Example 2 further refines the partitioned rolling parameters and adopts a differential rolling system to improve bending strength and fatigue resistance. The process of grinding teeth first and then rolling ensures a balance between tooth profile accuracy and strength. Closed-loop quality control monitors the S-bend value in real time, and unqualified products are automatically sorted. Quenching adopts multi-stage cooling to optimize tissue matching. The synergistic effect of each link realizes the refinement and intelligence of the manufacturing process, ensuring efficient cutting and long-term stability of the product.

[0045] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for manufacturing a band saw blade, characterized in that: The following steps are involved: Step S1: precision edge trimming, using a double-disc vertical edge trimming machine to simultaneously process the two edges of the raw steel strip in the thickness direction to form right-angled edges with a verticality of ≤0.05mm; Step S2, tooth profile forming: the steel strip is straightened to a flatness of ≤0.15 mm / m by a seven-roll straightening unit, and then a forming milling cutter is used to mill equidistant tooth supports on the continuously fed steel strip; Step S3, heat treatment strengthening, quenching and tempering treatment is performed in a protective atmosphere continuous furnace, and rapid cooling is performed at a cooling rate of ≥80°C / s after quenching; Step S4: composite straightening, firstly using a roller straightening machine to eliminate macro deformation, then using a planetary surface grinder to perform precision grinding on the back of the strip, controlling the bottom edge S-bend to ≤0.08mm / 450mm; Step S5, high-frequency welding, brazing the carbide tip to the tooth holder by high-frequency induction heating to form a rough band saw blade; Step S6: Partitioned roller pressing and strengthening, dynamically configuring the roller pressing area according to the width of the band saw blade: When the width W is less than or equal to 30 mm, three parallel roller belts are set between the tooth groove and the bottom edge; When 30mm<W≤50mm, set 4 parallel roller belts; When W>50mm, set 5 parallel roller belts; The width of the roller belt is (0.06-0.08)W, and an isolation zone with a width ≥1.2 times the width of the roller belt is reserved between adjacent roller belts; Step S7, adaptive finishing, select the process route according to the tooth pitch: When the tooth pitch P≤4.0mm, first roll hardening and then diamond grinding wheel grinding; When the tooth pitch P>4.0mm, grind the teeth first and then roll them, and keep a safe distance of ≥(P+0.5mm) between the roller working area and the tooth root.

2. A method for manufacturing a band saw blade according to claim 1, characterized in that: The heat treatment process in step S3 includes the following steps: Step S3.1, quenching at 1020-1040°C for 3-4 minutes, and cooling by spraying with a PAG aqueous solution; Step S3.2: Tempering process is carried out in stages at 620-640°C, with a total duration of ≥8 minutes.

3. The method for manufacturing a band saw blade according to claim 1, wherein: The composite straightening process of step S4 comprises the following steps: Step S4.1: Back grinding adopts cross-axis grinding method, and the grinding wheel feed per stroke is ≤0.005mm; Step S4.2: The surface roughness of the belt after grinding is Ra≤0.4μm.

4. The method for manufacturing a band saw blade according to claim 1, wherein: The rolling process of step S6 includes the following steps: Step S6.1: rolling line pressure 1.8-2.2 MPa, roller surface hard chrome plating treatment, hardness ≥ HRC62; Step S6.2: During rolling, the band saw blade runs at a speed of 15-25 m / min, and the tension is controlled to be 15%-20% of the yield strength.

5. The method for manufacturing a band saw blade according to claim 1, wherein: The step S6 further includes bottom edge polishing, which includes the following steps: Step S6.3: Use a floating belt polisher to perform mirror finishing on the bottom edge, with a polishing contact pressure of 0.5-1.0 N / mm²; Step S6.4: Surface roughness testing is performed to ensure that the surface roughness Ra after polishing is less than or equal to 0.1 μm.

6. The method for manufacturing a band saw blade according to claim 1, wherein: The partition rolling in step S6 specifically includes: The center line of the first rolled belt is 2.4-2.6mm away from the tooth groove, and the center line of the last rolled belt is 2.4-2.6mm away from the bottom edge; Deviation between the center line of the middle roller belt and the tooth groove-bottom edge bisecting plane ≤±0.2mm; A differential roller pressing system is used, with the diameter of the middle roller being 0.08-0.12mm larger than that of the edge rollers.

7. The method for manufacturing a band saw blade according to claim 1, wherein: The process of first grinding the teeth and then rolling in step S7 includes the following steps: Step S7.1: Gear grinding process uses a cup-shaped diamond grinding wheel with an axial swing amplitude of ≤0.05 mm; In step S7.2, the minimum distance between the rolling area boundary and the tooth groove is controlled to be max(2.5mm, 0.1W).

8. The method for manufacturing a band saw blade according to claim 1, wherein: The process also includes step S8, closed-loop quality control, where an online laser scanner monitors the S-bend value after rolling in real time. If the S-bend value is greater than 0.10 mm / 450 mm, a pressure-enhancing procedure is triggered to increase the rolling pressure by 30%-50% for a second rolling process. The step S8 also includes a pressure replenishment procedure, including the following steps: Step S8.1: The number of times of re-pressing shall not exceed 2 times, and the rolling speed shall be reduced by 20%-30% each time; Step S8.2: After the pressure is applied, if the S-bend is still greater than 0.10mm / 450mm, the product will be automatically sorted as a defective product.

9. The method for manufacturing a band saw blade according to claim 1, wherein: The quenching process in step S3 adopts a multi-stage cooling method: After keeping at the quenching temperature, first cool rapidly to 300-400℃ at a cooling rate of ≥60℃ / s, then transfer to the pre-cooling zone with a temperature of 200-300℃ and slowly cool at a cooling rate of 10-20℃ / s.

10. A band saw blade manufactured by the band saw blade manufacturing method according to any one of claims 1 to 9, characterized in that: The carbide tip is brazed to the tooth base to form the serrated portion, and the multi-pass parallel rolled belt is formed by partitioned rolling strengthening.

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