Method for manufacturing a band saw blade and band saw blade

Abstract

The present application relates to saw blade manufacturing technical field, and discloses a band saw blade manufacturing method and band saw blade, and the manufacturing method comprises the following steps: step S1, precision edge cutting;Step S2, tooth profile forming;Step S3, heat treatment strengthening;Step S4, composite straightening;Step S5, high-frequency welding;Step S6, partition roller pressing strengthening;Step S7, adaptive finishing;Step S8, closed-loop quality control;Band saw blade, hard alloy cutter head brazing is formed in the sawtooth part of tooth holder, and the multiple parallel roller pressing bands formed by partition roller pressing strengthening;Through the cooperation of partition roller pressing strengthening and adaptive finishing, the number and width of roller pressing areas are dynamically configured according to the width of band saw blade, reasonable isolation zones are set between adjacent roller pressing bands, local strengthening is realized, and the bending strength and fatigue resistance of tooth root are enhanced;According to the pitch, the process route is selected, and the tooth is ground after roller pressing strengthening or the tooth is ground before roller pressing, and the safety distance of roller working area and 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] In the research and development and implementation of band saw blade manufacturing processes, the following problems exist: first, for band saw blades of different specifications, there is a lack of clear setting rules for the number, position and size of the rolling areas, which can easily lead to uneven improvement in the rigidity of the backing material and even cause local stress concentration, affecting the sawing performance and life; second, there is a contradiction between the order of rolling treatment and tooth grinding process. Rolling first and then grinding will interfere with the tooth grinding accuracy, while grinding first and then rolling may damage the tooth tip. Based on this, the present invention designs a band saw blade manufacturing method and a band saw blade 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 solves the problem of uneven setting of rolling areas of band saw blades of different specifications in the background art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A method for manufacturing a band saw blade comprises the following steps:

[0007] 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;

[0008] 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;

[0009] 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;

[0010] 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;

[0011] Step S5, high-frequency welding, by high-frequency induction heating, the hard alloy head is brazed to the tooth holder to form a band saw blade rough blank;

[0012] Step S6, partition roller strengthening, according to the width of the band saw blade, the roller pressing area is dynamically configured: when the band width W≤30mm, 3 parallel roller pressing bands are arranged between the tooth groove and the bottom edge; when 30mm<W≤50mm, 4 parallel roller pressing bands are arranged; when W>50mm, 5 parallel roller pressing bands are arranged; wherein the roller pressing band width is (0.06-0.08)W, and the width of the isolation area between adjacent roller pressing bands is ≥1.2 times the roller pressing band width;

[0013] Step S7, adaptive finishing, according to the pitch, the process route is selected: when the pitch P≤4.0mm, the roller strengthening is carried out first and then the diamond grinding wheel is used for grinding; when the pitch P>4.0mm, the grinding is carried out first and then the roller pressing, the working area of the roller and the tooth root keep a safety distance of ≥(P+0.5mm).

[0014] Preferably, the heat treatment strengthening process in step S3 includes the following steps: step S3.1, quenching temperature 1020-1040℃, holding for 3-4 minutes, using PAG aqueous solution spray cooling;

[0015] Step S3.2, the tempering process is segmented at 620-640℃, and the total time is ≥8 minutes.

[0016] Through the above technical solution, in the tooth profile forming stage, the seven-roller straightening machine set first corrects the flatness of the steel strip, so that the flatness reaches micron-level precision, ensuring that the steel strip maintains a stable form in subsequent processing, and then a forming milling cutter mills equidistant tooth holders on the continuously fed steel strip.

[0017] The heat treatment strengthening process is a key link, quenching-tempering treatment is carried out in a continuous furnace in a protective atmosphere, rapid cooling during quenching causes the internal organization of the steel strip to change, obtaining high-hardness martensite organization; tempering is through segmented holding, making the organization tempering sorbite, eliminating quenching stress;

[0018] Preferably, the composite straightening process of step S4 includes the following steps: step S4.1, the back grinding adopts cross-axis grinding method, and the grinding wheel feeding amount per stroke is ≤0.005mm;

[0019] Step S4.2, the surface roughness Ra of the ground strip body is ≤0.4μm.

[0020] Through the above technical scheme, it can be seen that: during the composite straightening, the roller straightening machine first eliminates the macroscopic deformation and preliminarily corrects the overall shape of the band saw blade; then the planetary surface grinding machine precisely grinds the back of the strip, strictly controls the grinding wheel feed amount of each stroke by using the cross-axis grinding method, realizes high-precision back grinding, controls the bottom edge S bending in a very small range, and further improves the flatness and geometric precision of the band saw blade.

[0021] Preferably, the rolling process of step S6 includes the following steps: step S6.1, rolling line pressure 1.8-2.2 MPa, roller surface plated with hard chromium treatment, hardness≥HRC62;

[0022] Step S6.2, the running speed of the band saw blade during rolling is 15-25 m / min, and the tension control is 15%-20% of the yield strength.

[0023] Preferably, the step S6 further includes bottom edge polishing, including the following steps: step S6.3, using a floating abrasive belt polisher to perform mirror surface treatment on the bottom edge, polishing contact pressure 0.5-1.0 N / mm²;

[0024] Step S6.4, surface roughness detection is performed to make the surface roughness Ra≤0.1 μm after polishing.

[0025] Preferably, the partitioned rolling strengthening process of step S6 specifically includes: the center line of the first rolling strip is 2.4-2.6 mm away from the tooth groove, and the center line of the last rolling strip is 2.4-2.6 mm away from the bottom edge;

[0026] The center line of the middle rolling strip is deviated from the tooth groove-bottom edge bisector by ≤±0.2 mm;

[0027] A differential rolling system is adopted, and the diameter of the middle roller is 0.08-0.12 mm larger than that of the edge roller.

[0028] Through the above technical scheme, it can be seen that: the partitioned rolling strengthening dynamically configures the rolling area according to the width of the band saw blade, different widths correspond to different numbers of parallel rolling strips, and reasonable isolation zones are set between adjacent rolling strips. The accurate control of the rolling line pressure, the roller surface treatment, and the running speed of the band saw blade during rolling realizes the strengthening treatment of the local area of the band saw blade and enhances the bending strength and fatigue resistance of the key parts such as the tooth root.

[0029] Preferably, the process of grinding teeth first and then rolling in step S7 includes the following steps: step S7.1, the cup-shaped diamond grinding wheel is used in the tooth grinding process, and the axial swing amplitude of the grinding wheel is ≤0.05 mm;

[0030] Step S7.2, the minimum distance between the rolling area boundary and the tooth groove is controlled to be max(2.5 mm, 0.1W).

[0031] Preferably, the method further comprises a step S8 of closed-loop quality control, in which the online laser scanner monitors the S-bend value after rolling, and if the S-bend value is greater than 0.10 mm / 450 mm, a rolling pressure compensation program is triggered to increase the rolling pressure by 30-50% for secondary rolling.

[0032] The step S8 further comprises a rolling pressure compensation program, which comprises the following steps: step S8.1, the number of times of rolling pressure compensation is not more than 2, and the rolling speed is reduced by 20-30% each time; and step S8.2, if the S-bend value is still greater than 0.10 mm / 450 mm after rolling pressure compensation, the product is automatically sorted as unqualified.

[0033] Preferably, the quenching process in the step S3 adopts a multi-stage cooling mode: after holding at the quenching temperature, the steel strip is first rapidly cooled to 300-400℃ at a cooling rate of ≥60℃ / s, and then slowly cooled at a cooling rate of 10-20℃ / s in a pre-cooling zone at a temperature of 200-300℃.

[0034] According to a second aspect of the present application, a band saw blade is also provided, which comprises:

[0035] The band saw blade manufacturing method realizes that the hard alloy tool bit is brazed to the formed sawtooth part of the tooth holder, and a plurality of parallel rolling bands are formed by zonal rolling strengthening.

[0036] Compared with the prior art, the present application has the following beneficial effects:

[0037] 1. According to the present application, the number and width of the rolling regions are dynamically configured according to the width of the band saw blade by the cooperation of zonal rolling strengthening and adaptive finishing, a reasonable isolation zone is arranged between adjacent rolling bands to realize local strengthening and enhance the bending strength and fatigue resistance of the tooth root; the process route is selected according to the pitch, the tooth is ground after rolling strengthening or the tooth is rolled after grinding, the safety distance between the rolling wheel working area and the tooth root is reasonably controlled to avoid damage to the tooth root and ensure the integrity and cutting performance of the tooth part, and the overall performance of the saw blade is optimized.

[0038] 2. According to the present application, the two sides of the steel strip are simultaneously machined by a double-cutter vertical edge cutting machine to form a highly vertical right-angle edge, which provides a regular initial shape for subsequent processes; after the straightness is corrected by a seven-roller straightening machine, an equal-pitch tooth holder is milled by a forming milling cutter to ensure the flatness of the steel strip and the uniformity of the tooth holder, improve the production efficiency and precision, and lay a foundation for manufacturing high-quality saw blades.

[0039] 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

[0040] Figure 1 Create an overall flow chart for band saw blade manufacturing;

[0041] Figure 2 Detailed flow chart for heat treatment enhancement;

[0042] Figure 3 It is a detailed flow chart of zoned roller strengthening;

[0043] Figure 4 Detailed flow chart of adaptive finishing. DETAILED DESCRIPTION

[0044] 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. Example

[0045] See also Figures 1-4 In an embodiment of the present invention, a method for manufacturing a band saw blade includes the following steps:

[0046] 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;

[0047] 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;

[0048] 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;

[0049] 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;

[0050] Step S5, high-frequency welding, by high-frequency induction heating, the hard alloy head is brazed to the tooth holder to form a band saw blade rough blank;

[0051] Step S6, partition rolling reinforcement, according to the width of the band saw blade, dynamically configure the rolling area: when the band width W≤30mm, 3 parallel rolling bands are arranged between the tooth groove and the bottom edge; when 30mm<W≤50mm, 4 parallel rolling bands are arranged; when W>50mm, 5 parallel rolling bands are arranged; wherein the rolling band width is (0.06-0.08)W, and the width of the isolation area between adjacent rolling bands is ≥1.2 times the width of the rolling band.

[0052] Step S7, adaptive finishing, according to the pitch, select the process route: when the pitch P≤4.0mm, first roll and then grind with diamond grinding wheel; when the pitch P>4.0mm, first grind and then roll, the working area of the roller and the tooth root keep a safety distance of ≥(P+0.5mm).

[0053] The heat treatment reinforcement process in step S3 includes the following steps: step S3.1, quenching temperature 1020-1040℃, holding for 3-4 minutes, using PAG water solution spray cooling; step S3.2, the tempering process is segmented at 620-640℃, the total time is ≥8 minutes. The composite straightening process of step S4 includes the following steps: step S4.1, the back grinding adopts cross-axis grinding method, the grinding wheel feeding amount per stroke is ≤0.005mm; step S4.2, the surface roughness of the grinding belt is Ra≤0.4μm. The rolling process of step S6 includes the following steps: step S6.1, the rolling line pressure is 1.8-2.2MPa, the roller surface is plated with hard chromium, and the hardness is ≥HRC62; step S6.2, the running speed of the band saw blade during rolling is 15-25m / min, and the tension control is 15%-20% of the yield strength. Step S6 also includes bottom edge polishing, including the following steps: step S6.3, using a floating abrasive belt polishing machine to polish the bottom edge to mirror surface, the polishing contact pressure is 0.5-1.0N / mm²; step S6.4, surface roughness detection is carried out, so that the surface roughness after polishing is Ra≤0.1μm.

[0054] The working principle of the embodiment of the application is: in the manufacturing process of the band saw blade, each step realizes efficient and accurate production of the band saw blade. In the precise edge cutting link, the double-cutter-plate vertical edge cutting machine simultaneously processes both sides of the raw steel belt, so that the straight edges with high perpendicularity are formed, and a regular initial shape is provided for the subsequent process.

[0055] The tooth forming stage, the straightening machine first corrects the flatness of the steel strip to micron level precision, ensures the stability of the steel strip in the subsequent processing, and then the forming milling cutter mills out equidistant teeth on the continuously fed steel strip. Quenching and tempering treatment is carried out in a continuous furnace in a protective atmosphere. Rapid cooling during quenching causes a change in the internal organization of the steel strip, resulting in high hardness martensite organization; tempering is carried out by segmental heat preservation, which makes the organization tempering sorbite, and eliminates the quenching stress.

[0056] During composite straightening, the roller straightening machine first eliminates macroscopic deformation and preliminarily corrects the overall shape of the band saw blade; then the planetary surface grinder precisely grinds the back of the strip, uses cross-axis grinding method, strictly controls the feed amount of each stroke of the grinding wheel, realizes high-precision back grinding, controls the bottom edge S-bend in a very small range, and further improves the flatness and geometric accuracy of the band saw blade.

[0057] High-frequency welding uses high-frequency induction heating principle to accurately braze the carbide tool bit to the tooth holder to form a band saw blade roughcast. It has fast heating speed and small heat affected zone, which can ensure the firm combination between the tool bit and the steel strip body, and provides a reliable structural basis for subsequent tooth reinforcement and finishing.

[0058] Zonal roller pressing reinforcement dynamically configures the roller pressing area according to the width of the band saw blade, and sets reasonable isolation zones between adjacent roller pressing zones. Precise control of rolling line pressure, roller surface treatment and running speed of the band saw blade during roller pressing realizes the reinforcement treatment of the local area of the band saw blade, and enhances the bending strength and fatigue resistance of the key parts such as the tooth root.

[0059] The adaptive finishing link selects different process routes according to the pitch. When the pitch is small, the teeth are ground after roller pressing to effectively improve the hardness and wear resistance of the teeth; when the pitch is large, the teeth are ground first and then rolled to ensure the tooth profile accuracy and strengthen the tooth root. The setting of the safe distance between the roller working area and the tooth root avoids damage to the tooth root during processing, and ensures the integrity and cutting performance of the tooth. EMBODIMENT

[0060] Please refer to Figures 1-4In the embodiment of the present application, the partition roller pressing strengthening process of step S6 specifically comprises: the center line of the first roller pressing strip is 2.4-2.6 mm away from the tooth groove, and the center line of the last roller pressing strip is 2.4-2.6 mm away from the bottom edge; the center line of the middle roller pressing strip is deviated from the tooth groove-bottom edge bisector by ≤±0.2 mm; a differential roller pressing system is adopted, and the diameter of the middle roller is 0.08-0.12 mm larger than that of the edge roller. The process of grinding teeth first and then pressing in step S7 comprises the following steps: in step S7.1, the cup-shaped diamond grinding wheel is adopted in the tooth grinding process, and the axial swing amplitude of the grinding wheel is ≤0.05 mm; in step S7.2, the minimum distance between the boundary of the roller pressing area and the tooth groove is controlled to be max (2.5 mm, 0.1 W), so as to balance the strength of the tooth root and the cutting performance.

[0061] Further comprising step S8, closed-loop quality control, the online laser scanner monitors the S-bend value after roller pressing in real time, if the S-bend value is >0.10 mm / 450 mm, the supplementary pressing program is triggered, the rolling pressure is increased by 30%-50% for secondary roller pressing; step S8 further comprises a supplementary pressing program, comprising the following steps: step S8.1, the supplementary pressing times are not more than 2, and the roller pressing speed is reduced by 20%-30% each time; step S8.2, when the S-bend value after supplementary pressing is still >0.10 mm / 450 mm, the product is automatically sorted as unqualified product. In the quenching process of step S3, a multi-stage cooling mode is adopted: after holding at the quenching temperature, first, the cooling rate is ≥60 ℃ / s to rapidly cool to 300-400 ℃, and then the temperature is transferred to the pre-cooling zone at 200-300 ℃, and the cooling rate is 10-20 ℃ / s for slow cooling.

[0062] A band saw blade is manufactured by the method, a hard alloy tool bit is brazed to a sawtooth part formed by a tooth holder, and a plurality of parallel roller pressing strips are formed by partition roller pressing strengthening.

[0063] The working principle of the embodiment of the present application is that: in the partition roller pressing link, the position of the roller pressing strip is precisely adjusted, the center lines of the first and last roller pressing strips are kept at a constant distance of 2.4-2.6 mm from the tooth groove and the bottom edge respectively, the center line of the middle roller pressing strip is deviated from the tooth groove-bottom edge bisector within ±0.2 mm, and the differential roller pressing system is used, that is, the diameter of the middle roller is 0.08-0.12 mm larger than that of the edge roller, so as to realize local strengthening while avoiding stress concentration, and effectively improve the bending strength and fatigue resistance of the saw blade.

[0064] In the process of grinding teeth first and then pressing, the axial swing amplitude of the cup-shaped diamond grinding wheel is ≤0.05 mm to ensure the tooth profile accuracy, and the minimum distance between the boundary of the roller pressing area and the tooth groove is controlled to be max (2.5 mm, 0.1 W), so as to balance the strength of the tooth root and the cutting performance.

[0065] When closed-loop quality control is performed, the online laser scanner monitors the S-bend value in real time in a non-contact manner. When the S-bend is greater than 0.10 mm / 450 mm, the rolling pressure is increased by 30%-50% through a pressure compensation program (the number of pressure compensation is not more than 2, and the rolling speed is reduced by 20%-30% each time) to perform secondary rolling. If the S-bend is still not qualified after pressure compensation, the strip is automatically sorted out, and intelligent quality control of the manufacturing process is realized.

[0066] Quenching is performed by multi-stage cooling. First, rapid cooling is performed at ≥60℃ / s to 300-400℃, and then slow cooling is performed at 10-20℃ / s in the pre-cooling zone. The microstructure is optimized, the quenching hardness and tempering toughness are optimally matched, and the comprehensive mechanical properties of the band saw blade are improved. Embodiment

[0067] Please refer to Figures 1-4 In this embodiment, a double-metal band saw blade with a width of 41 mm and a pitch of 3.5 mm is taken as the processing object. First, a double-cutter vertical edge trimming machine is used to precisely trim the thickness of both sides of the 1.33 mm thick spring steel raw material strip, forming a right-angle edge with a perpendicularity of 0.03 mm. Then, a seven-roll straightening machine is used to correct the flatness of the steel strip to 0.10 mm / m, and a hard alloy forming milling cutter is used to mill equidistant tooth supports with a depth of 0.65 mm on the continuously fed steel strip. The heat treatment process is performed in a nitrogen-protected continuous furnace. Quenching at 1030℃ for 3.5 minutes and cooling at a rate of 85℃ / s, followed by segmented tempering: 625℃ for 3 minutes, 635℃ for 5 minutes, total time 8 minutes, hardness after treatment reaches 455HV.

[0068] In the straightening stage, first, a nine-roll straightening machine is used to eliminate macro-deformation, and then a 500-mesh diamond grinding wheel planetary grinder is used to implement cross-axis grinding on the back of the strip, with a single stroke feed amount of 0.004 mm. Finally, a strip with a bottom edge S-bend of 0.06 mm / 450 mm and a surface roughness Ra of 0.35μm is obtained. H10F hard alloy tool bits are brazed to the tooth supports at 980℃ through high-frequency induction heating to form a band saw blade rough blank.

[0069] The roll strengthening stage sets 4 parallel roll strips according to the strip width of 41 mm, each roll strip width is 2.87 mm, and 3.50 mm isolation area is reserved between adjacent roll strips; the center of the first roll strip is 2.5 mm away from the tooth groove, the center of the last roll strip is 2.5 mm away from the bottom edge, and the center of the middle strip deviates from the tooth groove-bottom edge bisector by 0.15 mm. A differential roll system is adopted, the diameter of the middle roller is 0.10 mm larger than that of the edge roller, the rolling is completed under the conditions of 2.0 MPa linear pressure and 20 m / min strip speed, and then the bottom edge is mirror treated by a floating abrasive belt polishing machine to obtain a surface with Ra0.09μm. Since the pitch is 3.5 mm≤4.0 mm threshold, the roll strengthening and grinding process is adopted: the tooth is ground by using a cup-shaped diamond grinding wheel with an axial swing amplitude of 0.04 mm, the grinding depth is 25% of the height of the tool head, and the tooth tip forms an R0.05mm round.

[0070] The online laser scanning shows that the finished product S-bend value is 0.09 mm / 450 mm, the threshold value is 0.10 mm, the pressure compensation program is not triggered, the final band saw blade does not have abnormal vibration when sawing a 250 mm aluminum bar at a linear speed of 2800 m / min, the cutting noise is ≤45 dB(A), and the service life reaches 55 m2 / m2 sawing area, which is 42% higher than that of the traditional process.

[0071] Working principle: Through the close cooperation of each step, efficient and accurate production is realized. Precise edge cutting and tooth profile forming provide regular shape and accurate tooth support for subsequent processing. Heat treatment strengthening optimizes the metallographic structure of the steel strip through quenching-tempering, and improves the hardness and toughness. Compound straightening eliminates macro deformation and precisely grinds the back, improving flatness. High-frequency welding firmly combines the tool head with the tooth support. The dynamic adjustment of the partition roll strengthening according to the strip width enhances the strength of the key parts. Adaptive finishing selects the process route according to the pitch to ensure the performance of the tooth part. Embodiment 2 further refines the partition roll strengthening parameters, adopts a differential roll system to improve the bending strength and fatigue resistance. The tooth grinding process ensures the 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 the organization matching. The synergistic effect of each link realizes the refinement and intelligentization of the manufacturing process, and ensures efficient cutting and long-term stability of the product.

[0072] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A band saw blade manufacturing method characterized by, The method comprises the following steps: Step S1, precise edge cutting, using a double-cutter vertical edge cutting machine to simultaneously process the two edges of the raw steel strip in the thickness direction to form a right-angle edge with a perpendicularity of ≤0.05 mm; Step S2, tooth profile forming, correcting the flatness of the steel strip to ≤0.15 mm / m through a seven-roller straightening machine group, and then milling equidistant tooth supports on the continuously fed steel strip using a forming milling cutter; Step S3, heat treatment strengthening, carrying out quenching-tempering treatment in a continuous furnace in a protective atmosphere, and rapidly cooling at a cooling rate of ≥80 ℃ / s after quenching; Step S4, composite straightening, first eliminating macroscopic deformation through a roller straightening machine, and then precisely grinding the back of the strip using a planetary surface grinder to control the S bend of the bottom edge to ≤0.08 mm / 450 mm; Step S5, high-frequency welding, welding the carbide tool bit to the tooth support through high-frequency induction heating to form a band saw blade roughcast; Step S6, zonal rolling strengthening, dynamically configuring the rolling zones according to the width of the band saw blade: When the strip width W is ≤30 mm, three parallel rolling zones are arranged between the tooth groove and the bottom edge; When 30 mm < W ≤ 50 mm, four parallel rolling zones are arranged; When W > 50 mm, five parallel rolling zones are arranged; The width of each rolling zone is (0.06-0.08) W, and the width of the isolation zone between adjacent rolling zones is ≥1.2 times the width of the rolling zone; Step S7, adaptive finishing, selecting a process route according to the pitch: When the pitch P is ≤4.0 mm, first rolling strengthening and then diamond grinding wheel grinding are performed; When the pitch P is >4.0 mm, first grinding and then rolling are performed, and the safety distance between the rolling work area and the tooth root is ≥(P+0.5 mm).

2. The band saw blade manufacturing method according to claim 1, wherein The heat treatment strengthening process in step S3 comprises the following steps: Step S3.1, quenching at a temperature of 1020-1040 ℃ for 3-4 minutes, and spraying cooling using PAG aqueous solution; Step S3.2, tempering at a temperature of 620-640 ℃ in stages for a total time of ≥8 minutes.

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

4. The band saw blade manufacturing method according to claim 1, wherein The rolling process in step S6 comprises the following steps: Step S6.1, the rolling line pressure is 1.8-2.2 MPa, the roller surface is plated with hard chromium, and the hardness is ≥HRC62; Step S6.2, the running speed of the band saw blade during rolling is 15-25 m / min, and the tension control is 15%-20% of the yield strength.

5. The band saw blade manufacturing method according to claim 1, wherein The step S6 further comprises bottom edge polishing, comprising the following steps: Step S6.3, using a floating abrasive belt polishing machine to perform mirror surface treatment on the bottom edge, and the polishing contact pressure is 0.5-1.0 N / mm²; Step S6.4, surface roughness detection is performed to make the surface roughness Ra after polishing ≤0.1 μm.

6. The band saw blade manufacturing method according to claim 1, wherein The zonal rolling strengthening process in step S6 specifically comprises: The center line of the first rolling zone is 2.4-2.6 mm away from the tooth groove, and the center line of the last rolling zone is 2.4-2.6 mm away from the bottom edge; The center line of the intermediate rolling zone is deviated from the tooth groove-bottom edge bisector by ≤±0.2 mm. The differential roller system is adopted, and the diameter of the middle roller is 0.08-0.12mm larger than that of the edge roller.

7. The band saw blade manufacturing method according to claim 1, wherein The process of the step S7 includes the following steps: In the step S7.1, the cup-shaped diamond grinding wheel is adopted, and the axial swing amplitude of the grinding wheel is ≤0.05mm; In the step S7.2, the minimum distance between the boundary of the rolling area and the tooth groove is controlled as max(2.5mm, 0.1W).

8. The band saw blade manufacturing method according to claim 1, wherein The step S8 further includes the following steps: In the step S8.1, the number of the supplement rolling is not more than 2, and the rolling speed is reduced by 20%-30% each time. In the step S8.2, when the S-bend value after the supplement rolling is still >0.10mm / 450mm, the product is automatically sorted as unqualified product. In the quenching process of the step S3, the multi-stage cooling mode is adopted:

9. The band saw blade manufacturing method according to claim 1, wherein After the heat preservation at the quenching temperature, the product is firstly rapidly cooled to 300-400℃ at a cooling rate of ≥60℃ / s, and then slowly cooled at a cooling rate of 10-20℃ / s in the pre-cooling area with a temperature of 200-300℃. The sawtooth part is formed by brazing the hard alloy cutter head to the tooth holder, and the multiple parallel rolling bands are formed by the partition rolling strengthening.

10. A band saw blade produced by the method according to any one of claims 1 to 9, characterized in that ​

Images