Coating process for band saw blade

Abstract

The invention relates to a band saw blade coating process which comprises the following operations: passivating a band saw blade to be coated, cleaning the band saw blade after passivating, drying the band saw blade after cleaning, and assembling the band saw blade after drying on a clamp. And after assembly treatment, the band saw blade is conveyed into coating equipment for coating treatment, and passivating treatment is used for passivating tooth tips of sawteeth on the band saw blade. According to the technical scheme, the hardness of the sawteeth can be effectively improved, the service life of the band saw blade is prolonged, and the sawing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of saw blade production, and particularly to a coating process for band saw blades. Background Art

[0002] A bimetal band saw blade is a strip-shaped saw blade composed of a spring steel back material and a high-speed steel tooth tip material. Due to the different metal components of the back material and the tooth tip material, this strip-shaped saw blade is called a "bimetal" band saw blade. Strictly speaking, bimetal band saw blades are divided into high-speed steel bimetal band saw blades and alloy bimetal band saw blades. Bimetal band saw blades can be widely used in cutting various metal materials, wood, plastics, etc., and have the advantages of high cutting efficiency, large size, neat cut, low cost, etc.

[0003] The tooth tip material of the bimetal band saw blade is generally M42 or M51 high-speed steel, with a hardness of about HV940. The coating of the saw blade is generally prepared by multi-arc ion plating technology. The hardness of the conventional coating is HV2500 - 4000. Coating the tooth tip is like putting on a layer of armor on the surface, which significantly improves the sawing life of the bimetal band saw blade, especially when sawing super-hard materials such as die steel, duplex stainless steel, and superalloy. In addition, after coating, the tooth tip of the saw blade is not easily worn and becomes sharper, and the sawing efficiency can be increased by 10% - 20%. The improvement of the life and sawing efficiency can reduce the time of changing the saw blade, which plays a good role in reducing costs and increasing efficiency in the production process. At present, domestic coating treatment of band saw blades can be achieved, but the quality of the coating treatment is uneven, and even negative effects may be brought after coating. Therefore, it is necessary to provide a more reliable coating process for saw blades. Summary of the Invention

[0004] The purpose of the present invention is to provide a coating process for band saw blades, which can effectively improve the performance of the saw blades.

[0005] The technical solution adopted by the present invention is as follows.

[0006] A coating process for band saw blades, characterized by including the following operations: subjecting the band saw blade to be coated to passivation treatment, washing the band saw blade after the passivation treatment, drying the band saw blade after the washing treatment, assembling the dried band saw blade on a fixture, and then sending it into a coating device for coating treatment. The passivation treatment is used to make the tooth tips of the saw teeth on the band saw blade passivated.

[0007] A further solution is that during the passivation treatment, washing treatment, and drying treatment, the band saw blade is conveyed in a state where the back of the tooth is in front and the tooth tip is behind along the conveying direction.

[0008] The band saw blade is passivated by sandblasting process. The sandblasting material used during passivation is 60-320# white fused alumina or brown fused alumina; the mass ratio of water to sand is 5:1 to 10:1; the sandblasting pressure is 0.2-0.6 MPa; the linear speed of the band saw blade conveying is 0.5-10 m / min.

[0009] Set the number of spray guns to 2-6, the number of forward spray guns to 1-3; the number of reverse spray guns to 1-3, the distance between the spray gun and the saw teeth is 50-200 mm; the spray gun angle is 30-90 degrees.

[0010] The band saw blade is cleaned by spray process. The cleaning process includes chemical cleaning treatment and pure water cleaning treatment carried out in sequence.

[0011] The cleaning solution used for chemical cleaning treatment is an aqueous solution containing 1% NaOH by mass percentage and 0.2% Anticorr PLUS rust inhibitor by mass percentage, and the temperature of the cleaning solution is 55-65 °C.

[0012] First, weld a section of auxiliary leading tape at the front end of the band saw blade, and then convey the band saw blade for passivation treatment after welding the auxiliary leading tape.

[0013] The thickness of the auxiliary leading tape is the same as that of the band saw blade, the height is 2-3 mm lower than the height of the band saw blade, and the material is stainless steel or spring steel.

[0014] The winding and assembling process includes winding the accompanying tape and the band saw blade into a disk shape on the coating disk, and fixing the tails of the accompanying tape and the band saw blade through a fixing component. After winding and forming, the saw teeth of the band saw blade are arranged away from the coating disk, and the accompanying tape and the coated band saw blade are arranged in an interval and staggered shape from the inside to the outside. The height of the accompanying tape is 2-4 mm lower than the height of the tooth tip. The material of the accompanying tape is stainless steel or carbon steel. The band saw blade is composed of a blade body part and saw teeth on the blade body part, and the accompanying tape wraps the blade body part of the band saw blade.

[0015] The coating treatment is ion plating. The coating film layer includes superhard TiN, AlCrN, AlTiN, TiSiN, TiAlSiN, TiCrAlSiN, DLC, with a hardness of HV2500-HV4000 and a film thickness of 2-6 μm.

[0016] The above technical solution provided by the present invention can effectively improve the hardness of the saw teeth and improve the service life and sawing efficiency of the band saw blade. Brief Description of the Drawings

[0017] Figure 1 It is a process schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the saw tooth orientation when the band saw blade is conveyed.

[0019] Figure 3It is a structural schematic diagram of forward spraying and reverse spraying.

[0020] Figure 4 It is a partial structural schematic diagram after the band saw blade and the coating companion tape are wound. Specific embodiments

[0022] In order to make the purpose and advantages of the present invention more clear, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention, and does not strictly limit the scope of protection specifically claimed by the present invention.

[0023] As used herein, terms such as "parallel", "perpendicular", etc. are not limited to their strict geometric definitions, but include tolerances for machining or human errors that are reasonable and inconsistent.

[0024] The quality of the coating treatment of the band saw blade is closely related to the pretreatment process and the coating process before the vacuum coating of the bimetal band saw blade. The pretreatment of the bimetal band saw blade can remove the oxides and contaminants on the surface, which is a necessary condition for improving the bonding force of the coating. Through passivation treatment, the tooth tips can be passivated, so that the saw blade is evenly stressed during cutting, reducing the probability of chipping, and having an obvious effect on improving the service life of the saw blade. In addition, the integrity of the tooth tips should be ensured throughout the pretreatment process, and the requirements for the operation process are relatively high. The present invention mainly focuses on the improvement and research and development of the pretreatment before coating, and the equipment and operation parameters used for the coating treatment can be the same as the existing implementation manners.

[0025] The coating process of the band saw blade provided by the present invention specifically includes the following operations.

[0026] Incoming material inspection: Use a 5~40× magnifying glass with a lamp to check the state of the tooth tips of the incoming band saw blade. The inspection items include the chipping and rusting state of the incoming edge. The upper limit of the chipping amount of the tooth tip is 0.2 mm, and the number of chipped teeth cannot exceed 5% of the total number of teeth. For band saw blades with floating rust on the surface and no obvious damage to the substrate, there is no need for control. The chipping of the band saw blade will affect the stability of sawing, resulting in excessive resistance causing the band to break or uneven stress causing skewed cutting, and it is difficult to play a good role after coating. Therefore, the control of incoming materials is particularly crucial. The floating rust on the surface of the band saw blade with no obvious damage to the substrate can be removed by sandblasting in the later stage, which has no impact on the coating.

[0027] Rewinding: For the movement direction of the saw blade, there are generally two forms of the coiling of the saw blade, which are divided into "tooth tip forward" and "tooth back forward", as Figure 1As shown in the figure. During the sandblasting passivation, cleaning, and drying processes of the saw blade, if the tooth tips face forward, when the saw blade passes through the slit of the sandblasting, cleaning, and drying line, the cutting edge will hit the side wall of the slit, causing jams in the production line, chipping of the saw blade cutting edge, or damage to the slit. This should be avoided during the production process. If the tooth backs face forward, there will be no cutting tendency, and no damage will be caused to the saw blade or the production line, so there is no need for a rewinding process. For saw blades with tooth tips facing forward in the incoming material, a rewinding process is required to make the tooth backs face forward, that is, by using two working disks to swap the head and tail positions of the saw blade. The rewinding process can make the tooth backs of the saw blade face forward, and there will be no cutting tendency when passing through the production line, avoiding damage to the saw blade and the production line.

[0028] Leading strip welding: To maintain the consistency of saw blade production and prevent situations such as missed spraying, over-spraying, or uneven sandblasting, after rewinding and before sandblasting passivation, a 10 - 15m long leading strip (ensuring the length exceeds the total length of the production line) needs to be welded to the front end of the saw blade. After the equipment starts running, it will not directly spray onto the saw blade first, but onto the leading strip. The thickness of the leading strip is the same as that of the saw blade, the height is 2 - 3mm lower than that of the saw blade, and the material is stainless steel or spring steel. The leading strip first passes through the sandblasting line, cleaning line, and drying line, which can avoid missed spraying, over-spraying, or uneven sandblasting of the front-end saw blade. Additionally, when winding on the coating disk, the leading strip will wind around the innermost circle of the coating disk, forming a certain thickness and providing a certain buffer for the inner saw blade, avoiding excessive deformation and over-plating of the saw blade.

[0029] Sandblasting passivation: Adjust the left and right guide wheels of the sandblasting machine according to the height of different saw blades to ensure that the tooth tips are completely exposed on the sandblasting platform. The sandblasting material is 60 - 320# white fused alumina or brown fused alumina; the maximum water-sand mass ratio is 10:1, and the minimum is 5:1; the sandblasting pressure is 0.2 - 0.6 MPa; the saw blade linear speed is 0.5 - 10 m / min; the number of spray guns is 2 - 6; the number of positive spray guns (specified as the spray gun facing the tooth tip direction, as shown below Figure 2 shown) is 1 - 3; the number of reverse spray guns (specified as the spray gun facing away from the tooth tip direction, or facing the tooth back direction, as shown below Figure 2 shown) is 1 - 3; the gun base distance is 50 - 200 mm; the spray gun angle is 30 - 90 degrees; according to the different quantities of saw blades sandblasted, the water-sand replacement cycle is 3 - 5 days. The sandblasting passivation process can remove oxides and contaminants. Through the combination of sandblasting material, number of spray guns, spray gun angle, positive and reverse spraying, sandblasting pressure, and gun base distance, different degrees of passivation effects of the saw blade can be achieved, enabling the saw blade to wear evenly during the working cutting process, reducing the risk of chipping. Additionally, it provides a guarantee for the bonding force of the subsequent coating process.

[0030] Spray cleaning: Sandblasting passivation, spraying, and drying are combined lines. After the sandblasting passivation process is completed, the saw blade immediately passes through the spray line, which includes a chemical spray tank and two pure water spray tanks to remove residual sand and pollutants on the surface. Chemical ratio: 1% NaOH + 0.2% Anticorr PLUS rust inhibitor; temperature: 55-65℃; the line speed of the saw blade is the same as that of sandblasting passivation. After the chemical spraying, two pure water sprays are used to make the saw blade cleaner. After sandblasting passivation, there are a small amount of sand and pollutants remaining on the surface of the saw blade, which can be removed and rust-proofed in a short time through the spray cleaning process, providing good bonding force for the coating.

[0031] Drying treatment: After spray cleaning, the saw blade passes through the drying tank, and high-temperature and high-speed wind cutting removes surface moisture. The temperature is 100-150℃, the wind speed is 20-60m / s, the outlet width is 2mm, and the number of wind knives is 6. High-temperature and high-speed wind cutting removes surface moisture and dries the saw blade quickly.

[0032] Winding of the tape: The staff wears masks, dust-free gloves and head covers. After the sandblasting machine has been running for 5 minutes, set the saw blade linear speed to 0.5-10m / min according to the pre-treatment sandblasting process sheet, click the counterclockwise or clockwise speed tracking on the linear speed meter, and the saw blade and the tape are synchronously wound on the coating disk one layer of saw blade and one layer of tape. During the operation, ensure that the saw blade and the tape are close to the disk. After winding, use steel wire to tie the tape and saw blade tightly at 5cm from the tail of the tape. Figure 3 As shown, the tail end of the saw blade is prevented from spreading and hitting the furnace wall, causing a short circuit inside the coating furnace. The installed saw blade is fixed with the large plate fixing screw and the saw blade fixing screw to prevent gaps inside the saw blade from causing overflow plating. The coating on the back of the saw blade teeth will affect the sawing fatigue life. The function of the accompanying belt is to fix the coating area on the tip of the saw blade to prevent plating on the back of the teeth. With a special fixing fixture, the saw blade can be prevented from spreading or generating gaps during the coating heating process.

[0033] Coating treatment: After exhaust, heating, ion cleaning, metal etching, base layer, transition layer, and functional layer, the saw blade edge is coated with super-hard TiN, AlCrN, AlTiN, TiSiN, TiAlSiN, TiCrAlSiN, DLC and other coatings with a hardness range of HV2500-4000 and a film thickness of 2~6μm. Super-hard coatings can improve the wear resistance and heat insulation of saw blades, reduce the friction coefficient, and provide certain anti-corrosion properties, thereby improving the cutting efficiency and life of saw blades. The specific coating treatment can be operated according to the existing coating treatment implementation methods and parameters.

[0034] Example 1: AlTiN coating is prepared on a 54 1.4 / 2 tooth bimetallic band saw blade, which is suitable for cutting hard materials such as die steel and alloy steel.

[0035] Use a 10× magnifying glass with a light to check the tip status of the incoming band saw blade. The inspection items include chipping and rusting of the incoming edge. The upper limit of the chipping amount at the tip is 0.2 mm, and the number of chipped teeth shall not exceed 5% of the total number of teeth. For band saw blades with floating rust on the surface and no obvious damage to the base material, no control is required.

[0036] For the movement direction of the saw blade, the coiled belt of the saw blade generally has two forms, namely "tip forward" and "back forward". When the saw blade is in the processes of sandblasting passivation, cleaning, and drying, if the tip is forward, when the saw blade passes through the slit of the sandblasting, cleaning, and drying line, the edge will hit the side wall of the slit, causing jamming of the production line, chipping of the saw blade edge, or cutting the slit, which should be avoided during the production process. If the back is forward, there will be no cutting tendency, and it will not damage the saw blade and the production line, so no rewinding process is required. For the incoming saw blade with the tip forward, a rewinding process is required to make the back forward, that is, use two working disks to swap the head and tail positions of the saw blade.

[0037] In order to maintain the consistency of saw blade production and avoid situations such as missed spraying, overspraying, or uneven sandblasting, after rewinding and before sandblasting passivation, a 12m long guiding belt should be welded to the front end of the saw blade. After the equipment runs, it will not directly spray on the saw blade first, but on the guiding belt. The thickness of the guiding belt is the same as that of the saw blade, the height is 3mm lower than that of the saw blade, and the material is stainless steel or spring steel.

[0038] Adjust the left and right guide wheels of the sandblasting machine according to the height of different saw blades to ensure that the tips are completely exposed on the sandblasting platform. The sandblasting material is 120# white corundum; the mass ratio of water to sand is 10:1; the sandblasting pressure is 0.35 MPa; the linear speed of the saw blade is 3 m / min; the number of spray guns is 4; the number of forward spray guns is 2; the number of reverse spray guns is 2; the gun base distance is 90 mm; the spray gun angle is 45 degrees; the replacement cycle of water and sand is 3 days.

[0039] The sandblasting passivation, spraying, and drying are a combined line. After the sandblasting passivation process is completed, the saw blade immediately passes through the spraying line, which includes a pharmaceutical spraying tank and two pure water spraying tanks to remove the residual sand grains and pollutants on the surface. Pharmaceutical ratio: 1% NaOH + 0.2% Anticorr PLUS rust inhibitor; temperature: 58°C; the linear speed of the saw blade passing through is the same as that of sandblasting passivation. After pharmaceutical spraying, 2 pure water sprayings are used to make the saw blade cleaner.

[0040] The saw blade after spray cleaning passes through the drying tank, and the surface moisture is removed by high-temperature and high-speed air shearing. The temperature is 120°C, the wind speed is 60 m / s, the outlet width is 2 mm, and the number of air knives is 6.

[0041] Workers wear masks, dust-free gloves and headgear. After the sandblasting machine runs for 5 minutes, set the saw blade linear speed at 3 m / min according to the pretreatment sandblasting process sheet, click the counterclockwise or clockwise speed tracking on the linear speed meter, and the saw blade and the accompanying tape are wound around the coating disk synchronously layer by layer, with one layer of saw blade and one layer of accompanying tape. During the operation, ensure that the saw blade and the accompanying tape are closely attached to the large disk.

[0042] After the winding is completed, tie the accompanying tape and the saw blade tightly with steel wire at 5 cm from the tail of the accompanying tape to prevent the end of the saw blade from spreading and touching the furnace wall, resulting in a short circuit inside the coating furnace. Fix the installed saw blade with the large disk fixing screws and special saw blade fixing screws to prevent gaps inside the saw blade from causing overplating.

[0043] In the coating process, after evacuation, heating, ion cleaning, metal etching, primer layer, transition layer, and functional layer, a superhard AlTiN coating is deposited on the cutting edge of the saw blade, with a hardness range of HV3000 - 3500 and a film thickness of 6 μm.

[0044] Example 2: Prepare a DLC coating on a 41 2 / 3 - tooth bimetal band saw blade, which is suitable for cutting sticky materials such as copper alloys and aluminum alloys.

[0045] Use a 10× magnifying glass with a light to check the tip state of the incoming band saw blade. The inspection items include the chipping and rusting state of the incoming cutting edge. The upper limit of the chipping amount at the tip is 0.2 mm, and the number of chipped teeth cannot exceed 5% of the total number of teeth. For band saw blades with floating rust on the surface and no obvious damage to the substrate, no control is required.

[0046] For the movement direction of the saw blade, the coiling of the saw blade generally has two forms, namely "tooth tip forward" and "tooth back forward". When the saw blade undergoes sandblasting passivation, cleaning, and drying processes, if the tooth tip is forward, when the saw blade passes through the slit of the sandblasting, cleaning, and drying line, the cutting edge will hit the side wall of the slit, causing jamming of the production line, chipping of the saw blade cutting edge, or cutting the slit, which should be avoided during the production process. If the tooth back is forward, there will be no cutting tendency and no damage to the saw blade and the production line, and no rewinding process is required. For the incoming saw blade with the tooth tip forward, a rewinding process is required to make the tooth back forward, that is, use two working disks to swap the head and tail positions of the saw blade.

[0047] In order to maintain the consistency of saw blade production and avoid situations such as missed spraying, overspraying, or uneven sandblasting, after rewinding and before sandblasting passivation, weld a 10 - m long leading tape to the front end of the saw blade. After the equipment runs, it will not directly spray on the saw blade first, but on the leading tape. The thickness of the leading tape is the same as that of the saw blade, the height is 2.5 mm lower than that of the saw blade, and the material is stainless steel or spring steel.

[0048] Adjust the left and right guide wheels of the sandblasting machine according to the height of different saw blades to ensure that the tooth tips are completely exposed above the sandblasting platform. The sandblasting material is 120# white fused alumina; the mass ratio of water to sand is 10:1; the sandblasting pressure is 0.5 MPa; the linear speed of the saw blade is 5 m / min; the number of spray guns is 6; the number of forward spray guns is 3; the number of reverse spray guns is 3; the gun base distance is 110 mm; the spray gun angle is 45 degrees; the replacement cycle of water and sand is 3 days.

[0049] Sandblasting passivation, spraying, and drying are combined in a production line. After the sandblasting passivation process is completed, the saw blade immediately passes through the spraying line, which includes one chemical spraying tank and two pure water spraying tanks to remove residual sand grains and pollutants on the surface. Chemical ratio: 1% NaOH + 0.2% Anticorr PLUS rust inhibitor; temperature: 55 °C; the linear speed of the saw blade passing through is the same as that of sandblasting passivation. After chemical spraying, two pure water sprayings are used to make the saw blade cleaner.

[0050] The saw blade after spray cleaning passes through the drying tank, and the moisture on the surface is removed by high-temperature and high-speed air cutting. The temperature is 110 °C, the wind speed is 50 m / s, the width of the air outlet is 2 mm, and the number of air knives is 6.

[0051] Workers wear masks, dust-free gloves, and headgear. After the sandblasting machine runs for 5 minutes, set the linear speed of the saw blade to 5 m / min according to the pretreatment sandblasting process sheet, and click the counterclockwise or clockwise speed tracking on the linear speed meter. The saw blade and the accompanying tape are wound around the coating disk synchronously layer by layer, with one layer of saw blade and one layer of accompanying tape. During the operation, ensure that the saw blade and the accompanying tape are tightly attached to the large disk.

[0052] After the winding is completed, tie the accompanying tape and the saw blade tightly with a steel wire at 5 cm from the tail of the accompanying tape to prevent the end of the saw blade from spreading and touching the furnace wall, causing a short circuit inside the coating furnace. The installed saw blade is fixed with large disk fixing screws and special saw blade fixing screws to prevent gaps inside the saw blade from causing overcoating.

[0053] The coating process includes evacuation, heating, ion cleaning, metal etching, primer layer, transition layer, and functional layer. A super-hard DLC coating with a hardness range of HV2500 - 3000 and a film thickness of 6 μm is coated on the cutting edge of the saw blade.

[0054] Example 3: Prepare an AlTiN coating on a 34 2 / 3 - tooth bimetal band saw blade, which is suitable for cutting materials such as die steel and bearing steel.

[0055] Use a 20× magnifying glass with a light to check the tooth tip state of the incoming band saw blade. The inspection items include the chipping and rusting state of the incoming cutting edge. The upper limit of the chipping amount at the tooth tip is 0.2 mm, and the number of chipped teeth cannot exceed 5% of the total number of teeth.

[0056] For the movement direction of the saw blade, there are generally two forms of the saw blade's coil, namely "tooth tip forward" and "tooth back forward". When the saw blade goes through the processes of sandblasting passivation, cleaning, and drying, if the tooth tip is forward, when the saw blade passes through the slit of the sandblasting, cleaning, and drying line, the cutting edge will hit the side wall of the slit, resulting in jamming of the production line, chipping of the saw blade's cutting edge, or cutting damage to the slit, which should be avoided during the production process. If the tooth back is forward, there will be no cutting tendency and no damage to the saw blade and the production line, and no rewinding process is required. For the saw blade with the tooth tip forward in the incoming material, a rewinding process is needed to make the tooth back forward, that is, two working disks are used to swap the head and tail positions of the saw blade.

[0057] In order to maintain the consistency of saw blade production and avoid situations such as missed spraying, over-spraying, or uneven sandblasting, after rewinding and before sandblasting passivation, a 10m-long guiding tape needs to be welded to the front end of the saw blade. After the equipment starts running, it will not directly spray on the saw blade first, but on the guiding tape. The thickness of the guiding tape is the same as that of the saw blade, the height is 2.5mm lower than the height of the saw blade, and the material is stainless steel or spring steel.

[0058] Adjust the left and right guide wheels of the sandblasting machine according to the height of different saw blades to ensure that the tooth tips are completely exposed on the sandblasting platform. The sandblasting material is 320# white corundum; the mass ratio of water to sand is 10:1; the sandblasting pressure is 0.55MPa; the linear speed of the saw blade is 5m / min; the number of spray guns is 6; the number of positive spray guns is 3; the number of reverse spray guns is 3; the gun base distance is 100mm; the spray gun angle is 45 degrees; according to the different quantities of saw blade sandblasting, the water-sand replacement cycle is 3 days.

[0059] The sandblasting passivation, spraying, and drying are a combined line. After the sandblasting passivation process is completed, the saw blade immediately passes through the spraying line, which includes a pharmaceutical spraying tank and two pure water spraying tanks to remove the remaining sand grains and pollutants on the surface. Pharmaceutical ratio: 1% NaOH + 0.2% Anticorr PLUS rust inhibitor; temperature: 65°C; the linear speed of the saw blade passing through is the same as that of sandblasting passivation. After pharmaceutical spraying, 2 pure water sprayings are used to make the saw blade cleaner. After sandblasting passivation, there are a small amount of sand grains and pollutants remaining on the surface of the saw blade, which can be removed cleanly and rust-proofed for a short time through the spraying and cleaning process, providing a good bonding force for the coating.

[0060] The saw blade after spraying and cleaning passes through the drying tank, and high-temperature and high-speed air knives are used to remove the surface moisture. The temperature is 100°C, the wind speed is 60m / s, the width of the air outlet is 2mm, and the number of air knives is 6. The high-temperature and high-speed air knives remove the surface moisture, making the saw blade dry quickly.

[0061] The staff wear masks, dust-free gloves and headgear. After the sandblasting machine has been running for 5 minutes, set the saw blade linear speed at 5 m / min according to the pretreatment sandblasting process sheet. Click the counterclockwise or clockwise speed tracking on the linear speed meter. The saw blade and the accompanying belt are wound around the coating disc synchronously, with one layer of saw blade and one layer of accompanying belt. During the operation, ensure that the saw blade and the accompanying belt are tightly attached to the large disc. After the winding is completed, tie the accompanying belt and the saw blade tightly with a steel wire at a position 5 cm from the tail of the accompanying belt, as Figure 4 shown, to prevent the end of the saw blade from spreading and touching the furnace wall, causing a short circuit inside the coating furnace. Fix the installed saw blade with the large disc fixing screws and the saw blade fixing screws to prevent gaps from forming inside the saw blade, which may cause overplating. After coating the back of the saw blade teeth, it will affect the sawing fatigue life. The role of the accompanying belt is to fix the coated area at the tip of the saw blade teeth, preventing coating on the back of the teeth. With a special fixing fixture, it can prevent the saw blade from spreading or forming gaps during the coating heating process.

[0062] In the coating process, after evacuation, heating, ion cleaning, metal etching, the bottom layer, the transition layer, and the functional layer, a superhard AlTiN coating is deposited on the saw blade edge, with a hardness range of HV2600 - 3500 and a film thickness of 6 μm. The superhard coating can improve the wear resistance, heat insulation ability, reduce the friction coefficient, and provide a certain degree of corrosion resistance of the saw blade, thereby improving the cutting efficiency and life of the saw blade. The specific coating treatment can be operated according to the existing implementation methods and parameters of the coating treatment.

[0063] Detect the performance of the uncoated band saw blade and the coated band saw blade in Example 3. The results are shown in the following table.

[0064] Table 1 Comparison results of performance parameters Saw blade type Passivation method Coating type and performance parameters Sawing cutting speed Sawing feed Sawing material Diameter of sawing material (mm) Hardness of sawing material (HRC) Average sawing life (blade) Single-pass sawing time (min) 34 2 / 3 teeth Naked saw No coating 50m / min 25mm / min 45# steel 110 38 (core) + 60 (outer ring) 2.5 4.4 34 2 / 3 teeth Sandblasting passivation AlTiN, HV3000, 6μm 50m / min 25mm / min 45# steel 110 38 (core) + 60 (outer ring) 6 4 As can be seen from the above, although the ordinary band saw blade (bare saw) has a low production cost, its cutting life for hard materials is short. The coated band saw blade has a cutting life 2.4 times that of the ordinary band saw blade, and the cutting efficiency has increased by 9%.

[0065] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specifically stated and limited, are implemented according to the conventional means in the art.

Claims

1. A band saw blade coating process, characterized in that, Including the following operations: The band saw blade to be coated is passivated. After passivation, the band saw blade is cleaned. After cleaning, the band saw blade is dried. The dried band saw blade is assembled on a fixture. After assembly, it is sent into a coating equipment for coating. The passivation treatment is used to blunt the tips of the saw teeth on the band saw blade.

2. The band saw blade coating process according to claim 1, characterized in that: During the passivation treatment, cleaning treatment and drying treatment, the band saw blade is conveyed with the back of the teeth in the front and the tips of the teeth in the back along the conveying direction.

3. The band saw blade coating process according to claim 1, characterized in that: The band saw blade is passivated by a sandblasting process. The sandblasting material used during passivation is 60-320# white fused alumina or brown fused alumina; the mass ratio of water to sand is 5:1 - 10:1; the sandblasting pressure is 0.2 - 0.6 MPa; the linear speed of the band saw blade conveyance is 0.5 - 10 m / min.

4. The band saw blade coating process according to claim 3, wherein: The number of spray guns is set to 2 - 6, the number of forward spray guns is 1 - 3; the number of reverse spray guns is 1 - 3. The distance between the spray gun and the saw teeth is 50 - 200 mm; the spray gun angle is 30 - 90 degrees.

5. The band saw blade coating process according to claim 1, characterized in that: The band saw blade is cleaned by a spraying process. The cleaning treatment includes a chemical cleaning treatment and a pure water cleaning treatment carried out in sequence.

6. The band saw blade coating process according to claim 5, characterized in that: The cleaning solution used for the chemical cleaning treatment is an aqueous solution containing 1% NaOH and 0.2% Anticorr PLUS rust inhibitor, and the temperature of the cleaning solution is 55 - 65°C.

7. The band saw blade coating process according to claim 1, characterized in that: First, a section of auxiliary leading tape is welded to the front end of the band saw blade. After welding the auxiliary leading tape, the band saw blade is conveyed for passivation treatment.

8. The band saw blade coating process according to claim 7, characterized in that: The thickness of the auxiliary leading tape is the same as that of the band saw blade, the height is 2 - 3 mm lower than the height of the band saw blade, and the material is stainless steel or spring steel.

9. The band saw blade coating process according to claim 1, wherein: The assembly treatment includes winding the coating companion tape and the band saw blade into a disk shape on a coating disk, and fixing the tails of the coating companion tape and the band saw blade through a fixing component. After winding and forming, the saw teeth of the band saw blade are arranged away from the coating disk, and the coating companion tape and the coated band saw blade are arranged in an alternating and spaced pattern from the inside to the outside. The band saw blade consists of a blade body part and saw teeth on the blade body part, and the coating companion tape wraps the blade body part of the band saw blade.

10. The band saw blade coating process according to claim 8, characterized in that: The coating treatment is vacuum coating. The coating film layer includes superhard TiN, AlCrN, AlTiN, TiSiN, TiAlSiN, TiCrAlSiN, DLC, with a hardness of HV2500 - HV4000 and a film thickness of 2 - 6 μm.

Images