Coated band saw blade

Abstract

The coating band saw blade comprises a band body, sawteeth and a coating, the sawteeth are arranged on the band body and comprise tooth parts and tooth grooves, the tooth grooves are formed between every two adjacent tooth parts, and the coating is formed on the surface of each tooth part; the coating is selected from one or more of a WC-Co layer, a WC-Co-Cr layer, a WC-Ni layer and a WC-CrC-Ni layer; the total thickness of the coating is 3 [mu] m-120 [mu] m. According to the coating band saw blade, the coatings are arranged on the surfaces of the tooth parts and the tooth grooves, the strength and toughness of the sawteeth are cooperatively improved, the strength of the cutting edge is improved, cutting abrasion can be remarkably reduced, the service life is prolonged, and the cutting efficiency is improved; the structure and the thickness of the coating are designed according to the cutting working condition of micro vibration of the band saw blade, the coating has hardness and toughness, is resistant to abrasion and friction, high in cutting rate and long in service life, can be used for saw cutting machining of materials such as metal materials, wood and high-molecular polymers, and is low in comprehensive coating cost and high in product cost performance.

Description

Technical Field

[0001] The present application relates to the technical field of saw blades, and in particular to a coated band saw blade. Background Art

[0002] Band saw blades are one of the most widely used cutting tools in the manufacturing industry. They process a wide range of materials, including nearly all metals, as well as non-metallic materials such as wood and polymers. During the sawing process, tooth wear can lead to band saw blade failure, resulting in significant waste of workpiece material and a significant increase in processing costs. Carbide coatings, with their high hardness and wear resistance, can significantly reduce tool wear, extending tool life and cutting efficiency.

[0003] Currently, coated band saw blades are primarily produced using physical vapor deposition (PVD). This coating requires high temperature and high vacuum conditions, resulting in high single-furnace time and cost, making it incompatible with the in-line production model for band saw blades. Thermal spraying, laser cladding, and electrospark deposition technologies have fewer substrate material limitations and place minimal demands on the substrate's condition, pretreatment, or vacuum environment. They can produce large-area coatings at high deposition rates and can be incorporated into existing in-line band saw blade production processes as a manufacturing process. Utility Model Content

[0004] The utility model provides a coated band saw blade to solve the technical problem in the prior art that the band saw blade is easily worn during the cutting process.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is as follows:

[0006] In a first aspect of the present invention, a coated band saw blade is provided, comprising a band body, saw teeth and a coating, wherein the saw teeth are arranged on the band body, the saw teeth include tooth portions and tooth grooves, the tooth grooves are formed between two adjacent tooth portions, and the coating is formed on the surface of the tooth portion; the coating is selected from one or more of a WC-Co layer, a WC-Co-Cr layer, a WC-Ni layer, and a WC-CrC-Ni layer; the total thickness of the coating is 3 μm to 120 μm.

[0007] Furthermore, the coating is formed on the surface of the tooth groove.

[0008] Furthermore, the total thickness of the coating is 10 μm to 30 μm.

[0009] Furthermore, the coating includes WC-Ni layers and WC-Co-Cr layers alternately arranged from the serrations outward, and the total number of layers of the coating is 2 to 10 layers.

[0010] Furthermore, the coating includes WC-Ni layers and WC-CrC-Ni layers alternately arranged from the serrations outwards, and the total number of layers of the coating is 2 to 10 layers.

[0011] Furthermore, the coating includes WC-Co layers and WC-Co-Cr layers alternately arranged from the serrations outward, and the total number of layers of the coating is 2 to 10 layers.

[0012] Furthermore, the coating includes WC-Co layers and WC-CrC-Ni layers alternately arranged from the serrations outward, and the total number of layers of the coating is 2 to 10 layers.

[0013] Furthermore, the coating comprises WC-CrC-Ni layers and WC-Co-Cr layers that are alternately arranged in sequence, and the total number of layers of the coating is 2 to 10 layers.

[0014] Furthermore, the total thickness of the coating is 6 μm to 100 μm.

[0015] Furthermore, the coating includes WC-Ni layers, WC-Co layers and WC-Co-Cr layers that are alternately arranged from the serrations outward, and the total number of layers of the coating is 3 to 9 layers.

[0016] Furthermore, the coating includes WC-Ni layers, WC-Co layers and WC-CrC-Ni layers that are alternately arranged from the serrations outward, and the total number of layers of the coating is 3 to 9 layers.

[0017] Furthermore, the coating includes a WC-Ni layer, a WC-Co-Cr layer and a WC-CrC-Ni layer which are alternately arranged from the sawtooth outward, and the total number of layers of the coating is 3 to 9 layers.

[0018] Furthermore, the coating includes WC-Ni layers, WC-CrC-Ni layers and WC-Co-Cr layers that are alternately arranged from the serrations outward, and the total number of layers of the coating is 3 to 9 layers.

[0019] Furthermore, the coating includes WC-Co layers, WC-Co-Cr layers and WC-CrC-Ni layers that are alternately arranged from the serrations outward, and the total number of layers of the coating is 3 to 9 layers.

[0020] Furthermore, the coating includes WC-Co layers, WC-CrC-Ni layers and WC-Co-Cr layers that are alternately arranged from the serrations outward, and the total number of layers of the coating is 3 to 9 layers.

[0021] Furthermore, the total thickness of the coating is 9 μm to 90 μm.

[0022] Furthermore, the material of the belt body is selected from carbon steel or spring steel, and the material of the teeth is selected from carbon steel, high-speed steel or cemented carbide.

[0023] Furthermore, the belt body has a width of 5 mm to 100 mm and a thickness of 0.5 mm to 1.6 mm.

[0024] Furthermore, the cutting edge of the tooth portion is an arc cutting edge, provided with a front angle and a back angle, and the blunting radius of the cutting edge is 5μm to 50μm; the front angle is 0° to 20°, and the back angle is 10° to 45°.

[0025] The coated band saw blade provided by the utility model is provided with a coating on the surface of the teeth and the tooth grooves, which synergistically improves the strength and toughness of the saw teeth, improves the strength of the cutting edge, can significantly reduce cutting wear, extend the service life, and improve cutting efficiency; the above-mentioned coating structure and thickness are designed for the cutting conditions of the band saw blade with slight vibration, and have both hardness and toughness, wear resistance and friction reduction, high cutting rate and long service life, can be used for sawing processing of materials such as metal materials, wood and high molecular polymers, and the comprehensive coating cost is low, and the product has high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of the structure of the coated band saw blade in the embodiment of the present invention.

[0028] Reference numerals:

[0029] 1. Belt body; 2. Tooth; 3. Tooth groove. DETAILED DESCRIPTION

[0030] In order to help those skilled in the art better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0031] It should be noted that when an element is referred to as being “fixed on” or “set on” another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being “connected to” another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout the description of this application, "plurality" or "several" means two or more, unless otherwise specifically defined.

[0034] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

[0035] An embodiment of the present application provides a coated band saw blade, comprising a band body, saw teeth and a coating, wherein the saw teeth are arranged on the band body, the saw teeth include tooth portions and tooth grooves, the tooth grooves are formed between two adjacent tooth portions, and a coating is formed on the surface of the tooth portion; the coating is selected from one or more of a WC-Co layer, a WC-Co-Cr layer, a WC-Ni layer, and a WC-CrC-Ni layer; the total thickness of the coating is 3 μm to 120 μm.

[0036] At present, the thickness of tungsten carbide-based ceramic coating on the surface of band saw blades is generally greater than 150μm. However, since band saw blade sawing is a typical micro-vibration cutting condition, the blunt radius of the saw tooth edge is concentrated in 5μm to 50μm. Tungsten carbide-based ceramic coating with a thickness of more than 150μm will not only cause the geometric dimensions of the saw tooth edge to become blunt and lose its cutting ability, but also the thicker single-layer coating has greater internal stress and poorer toughness, and is only mechanically bonded to the tooth part. Under the above-mentioned vibration cutting condition, the coating is easy to peel off quickly, and the peeled coating may even become abrasive particles to accelerate the wear of the saw teeth.

[0037] In addition, for tungsten carbide-based ceramic coated band saw blades with a thickness greater than 150μm, calculated based on a 41mm specification band saw blade, the preparation cost of the tungsten carbide-based ceramic coating per meter of the band saw blade is high, and the total cost of coating preparation is close to or even exceeds that of PVD coatings with better performance, which cannot meet the end customers' demand for cost-effective coated band saw blades.

[0038] The coated band saw blade of the embodiment of the present application has a plurality of saw teeth formed on the band body, tooth grooves are formed between adjacent teeth of the saw teeth, and the coating is provided on the surface of the tooth portion. Furthermore, a coating is formed on the surface of the tooth groove. The coating on the surface of the above-mentioned teeth or the teeth and tooth grooves may be a single layer or a multilayer. The coating may include a WC-Co layer, a WC-Co-Cr layer, a WC-Ni layer, or a WC-CrC-Ni layer. The total thickness of the coating is relatively thin, ranging from 3μm to 120μm. Furthermore, the total thickness of the coating is 10μm to 30μm.

[0039] The coated band saw blade of the embodiment of the present application is provided with a coating on the surface of the teeth or the teeth and tooth grooves, which synergistically improves the strength and toughness of the saw teeth, improves the strength of the cutting edge, can significantly reduce cutting wear, extend the service life, and improve cutting efficiency; the above-mentioned coating structure and thickness are designed for the cutting conditions of the band saw blade with slight vibration, and have both hardness and toughness, wear resistance and friction reduction, high cutting rate and long service life. It can be used for sawing processing of materials such as metal materials, wood and high molecular polymers, and the overall coating cost is low, and the product has high cost performance.

[0040] As a surface treatment technology, coating can reduce tool wear, improve tool service life and cutting efficiency because it can act as a chemical barrier and thermal barrier, effectively hindering the diffusion of elements and chemical hardening between the tool and the workpiece during the cutting process, while also having the advantages of high hardness and friction reduction.

[0041] The key to the coating's ability to play a role in cutting is not only that the coating's own mechanical properties and high-temperature properties are sufficiently excellent, but more importantly, that the coating can be tightly bonded to the tool substrate to avoid early peeling failure during the cutting process, which can lead to the inability to play a barrier role. The peeled coating may even act as hard abrasive particles to accelerate tool wear.

[0042] As for the tool body, the geometric dimensions of the tool are the key to achieving processing quality, processing efficiency and tool life. Through long-term application and research, it has been found that for different cutting materials and cutting conditions, there is an optimal value or optimal range for the geometric dimensions of the tool. When preparing a coating on the tool surface, the coating cannot affect or destroy the optimal geometric dimensions of the tool, so the thickness of the coating also needs to be controlled within a reasonable range. Currently, the surface coating thickness of commercial physical vapor deposition coated tools, such as turning tools, end mills and hobs, is generally within 10μm. The surface coating thickness of commercial chemical vapor deposition coated tools, such as turning tools and end mills, is generally between 10μm and 20μm.

[0043] Specifically speaking of band saw blades, the sawing process of band saw blades has its own particularities. Unlike traditional turning, the front angle of the band saw tooth edge is small, the radius of the blade tip is large, the sawing depth is small, the cutting layer is thin, and there is strong extrusion friction between the saw teeth and the processed material. In order to reduce vibration and noise and improve cutting efficiency, the band saw tooth edge adopts a variable tooth and split tooth design. The size parameters of different tooth blades are not uniform. Affected by the blade angle, tooth pitch, and tooth depth, the force form and damage failure are complex and changeable; in addition, the band saw teeth are subjected to high-frequency impact loads, and the poor chip removal further aggravates wear. The applicant's preliminary research shows that the common failure form of band saw blades during use is the wear and chipping of the tooth edge coating, which leads to premature failure of cutting ability. Therefore, in addition to the basic hardness, wear resistance and high temperature performance, the band saw tooth edge coating must also have excellent strength and toughness matching and wide-range tooth profile parameter adaptability to improve its performance and life under complex and harsh working conditions.

[0044] For example, the 41mm 2 / 3 TPI, one of the most widely used blades on the market, consists of five teeth arranged in a central-left-right-left-right pattern. The blade edge radius is 10-20μm, and the tooth height difference is ±25μm (the acceptable standard is ±40μm). If a tungsten carbide ceramic coating greater than or equal to 150μm is applied to the surface of a band saw blade, only approximately 30% of the teeth actually participate in the cutting process during the initial stages of cutting due to the 50μm height difference of the teeth. Consequently, these few teeth experience heavy cutting loads due to the thermal-mechanical coupling load, making them susceptible to premature tooth chipping and failure.

[0045] The cutting depth of a turning tool's edge ranges from 100 to 700 μm. In comparison, a single tooth in a band saw blade only cuts about 20 to 50 μm. Tungsten carbide ceramic coatings thicker than or equal to 150 μm cause the edge radius to change, reducing the sharpness of the teeth and resulting in a loss of cutting penetration. The coating crumbles under the pressure of the band saw blade's teeth and the workpiece, resulting in a sudden loss of 150 μm in height. This leads to a sudden change in the tooth height difference, which in turn changes the teeth involved in the cutting process. This 150 μm height change actually exceeds the acceptable height difference standard for the band saw blade by 87.5% to 150%. This excessive height difference further accelerates the cutting load on the teeth, leading to more coating delamination and tooth failure. Furthermore, because coating thicknesses greater than 150 μm reduce the tooth groove chip size by 3% to 5%, the delaminated coating becomes difficult to evacuate, and the hard abrasive particles further accelerate wear, dramatically increasing the probability of catastrophic failure of the band saw blade early in the cutting process.

[0046] This application targets the unique sawing conditions of band saw blades, and preferably has a coating thickness of 10μm to 30μm, which does not affect the edge size of the band saw blade. For the micro-vibration cutting conditions of band saw blades, the advantages of microstructure and multi-components are combined to achieve a synergistic improvement in the strength and toughness of the saw teeth, thereby improving the strength of the edge, significantly reducing cutting wear, extending service life, and improving cutting efficiency. The performance of the coated band saw blade is greater than or equal to tungsten carbide coated band saw blades with a coating thickness of 150μm, which has obvious performance advantages.

[0047] The coating of the coated band saw blade in the embodiment of the present application can be prepared by a thermal spraying method, which has little limitation on the base material and does not have excessively high requirements on the base material state, pretreatment, and vacuum environment of the parts. It can achieve a high deposition rate to complete the production of large-area coatings; and can be incorporated into the existing band saw blade in-line production mode as part of the manufacturing process, without the need for additional processes such as ultrasonic cleaning before spraying, dry sandblasting surface treatment, and post-spraying treatment, thereby achieving high production efficiency.

[0048] In some embodiments, the coating comprises WC-Ni layers and WC-Co-Cr layers alternately arranged from the serrations outward, and the total number of layers of the coating is 2 to 10. Preferably, the number of layers is 2 to 8.

[0049] In some other embodiments, the coating includes WC-Ni layers and WC-CrC-Ni layers alternately arranged from the serrations outward, and the total number of layers of the coating is 2 to 10 layers.

[0050] In an embodiment of the present application, the coating is provided on the surface of the tooth portion or the tooth portion and the tooth groove. From the surface of the tooth portion or the tooth groove, a WC-Ni layer and a WC-Co-Cr layer are arranged in sequence outward, or a WC-Ni layer and a WC-CrC-Ni layer are arranged in sequence, and the two coatings are arranged alternately. The number of coatings is up to 10 layers. Furthermore, the total thickness of the coating is 6μm to 100μm. Preferably, the thickness of each coating layer is 5μm. The overall thickness of the coating is 10μm to 40μm.

[0051] In some embodiments, the coating includes WC-Co layers and WC-Co-Cr layers alternately arranged from the serrations outward, with the number of layers ranging from 2 to 10. Preferably, the number of layers ranges from 2 to 8.

[0052] In some other embodiments, the coating includes WC-Co layers and WC-CrC-Ni layers alternately arranged from the serrations outward, with the number of layers ranging from 2 to 10. Preferably, the number of layers ranges from 2 to 8.

[0053] In an embodiment of the present application, the coating is provided on the surface of the tooth portion or the tooth portion and the tooth groove. From the surface of the tooth portion or the tooth groove, a WC-Co layer and a WC-Co-Cr layer are arranged in sequence outward, or a WC-Co layer and a WC-CrC-Ni layer are arranged in sequence, and the two coatings are arranged alternately. The number of coatings is up to 10 layers. Furthermore, the total thickness of the coating is 6μm to 100μm. Preferably, the thickness of each coating layer is 5μm. The overall thickness of the coating is 10μm to 40μm.

[0054] In some embodiments, the coating comprises alternating WC-CrC-Ni layers and WC-Co-Cr layers, with the total number of coating layers ranging from 2 to 10. The maximum number of coating layers is 10. Furthermore, the total thickness of the coating is 6 μm to 100 μm. Preferably, each coating layer has a thickness of 5 μm. The overall thickness of the coating is 10 μm to 40 μm.

[0055] In the embodiment of the present application, WC-CrC-Ni layers and WC-Co-Cr layers are alternately arranged on the surface of the saw teeth. The WC-CrC-Ni coating has good toughness and is suitable as a bonding layer with the saw teeth. The WC-Co-Cr has a high hardness and is responsible for providing wear resistance. These two coatings are alternately arranged to obtain a coating system with both strength and toughness, which is suitable for trace and vibration cutting conditions of band saw blades.

[0056] In some embodiments, the coating includes WC-Ni layers, WC-Co layers, and WC-Co-Cr layers alternately arranged from the serrations outward, with the total number of layers of the coating being 3 to 9. Preferably, the total thickness of the coating is 9 μm to 90 μm.

[0057] In other embodiments, the coating includes WC-Ni layers, WC-Co layers, and WC-CrC-Ni layers arranged alternately from the serrations outward, with the total number of layers of the coating being 3 to 9. Preferably, the total thickness of the coating is 9 μm to 90 μm.

[0058] In an embodiment of the present application, the coating is provided on the surface of the tooth portion or the tooth portion and the tooth groove. From the surface of the tooth portion or the tooth groove, a WC-Ni layer, a WC-Co layer and a WC-Co-Cr layer are arranged in sequence outward, or a WC-Ni layer, a WC-Co layer and a WC-CrC-Ni layer are arranged in sequence, and the three coatings are arranged alternately. The number of coatings is up to 9 layers. Furthermore, the total thickness of the coating is 9μm to 90μm. Preferably, the thickness of each coating layer is 7μm. The overall thickness of the coating is 21μm to 63μm.

[0059] In some embodiments, the coating includes WC-Ni layers, WC-Co-Cr layers, and WC-CrC-Ni layers that are alternately arranged from the serrations outward, and the total number of layers of the coating is 3 to 9 layers.

[0060] In other embodiments, the coating includes WC-Ni layers, WC-CrC-Ni layers and WC-Co-Cr layers arranged alternately from the serrations outward, and the total number of layers of the coating is 3 to 9 layers.

[0061] In some embodiments, the coating includes WC-Co layers, WC-Co-Cr layers, and WC-CrC-Ni layers that are alternately arranged from the serrations outward, and the total number of layers of the coating is 3 to 9 layers.

[0062] In some other embodiments, the coating includes WC-Co layers, WC-CrC-Ni layers and WC-Co-Cr layers arranged alternately from the serrations outward, and the total number of layers of the coating is 3 to 9 layers.

[0063] In an embodiment of the present application, the coating is arranged in sequence from the surface of the tooth portion or tooth groove to the outside, namely, a WC-Ni layer, a WC-Co-Cr layer and a WC-CrC-Ni layer, or a WC-Ni layer, a WC-CrC-Ni layer and a WC-Co-Cr layer, or a WC-Co layer, a WC-Co-Cr layer and a WC-CrC-Ni layer, or a WC-Co layer, a WC-CrC-Ni layer and a WC-Co-Cr layer, and the three coatings are arranged alternately. The number of coating layers is up to 9 layers. Furthermore, the total thickness of the coating layer is 9 μm to 90 μm. Preferably, the thickness of each coating layer is 7 μm. The overall thickness of the coating layer is 21 μm to 63 μm.

[0064] Band saw blades are designed to process a wide range of materials, including almost all metal materials, as well as non-metallic materials such as wood and polymers. To meet the demands of processing materials of different materials and sizes, band saw blades are available in a variety of specifications and tooth shapes. Similarly, there is currently no universal coating that can achieve efficient, long-lasting, and stable sawing of different processed materials. Therefore, the various coating compositions and structural designs proposed in the embodiments of this application are precisely tailored to the sawing needs of different processed materials.

[0065] Among the WC-Co, WC-Co-Cr, WC-Ni, and WC-CrC-Ni coatings, the WC-Ni coating, while having a lower hardness than the other four coatings, exhibits superior toughness and, in particular, excellent chemical stability, with a maximum service temperature of 500°C. The WC-Co coating exhibits moderate hardness and toughness, intermediate between the WC-Co-Cr and WC-Ni coatings, with a maximum service temperature of 500°C. Compared to the WC-Co and WC-Ni coatings, the WC-Co-Cr coating exhibits higher hardness and better wear resistance, but moderate toughness, with a maximum service temperature of 500°C. The WC-CrC-Ni coating exhibits similar hardness and wear resistance to the WC-Co-Cr coating, but exhibits better toughness, high-temperature oxidation resistance, and chemical stability, with a maximum service temperature of 750°C. Under certain high-speed, high-efficiency operating conditions with poor cooling conditions or even dry cutting, the WC-CrC-Ni coating exhibits superior high-temperature performance compared to the WC-Co-Cr coating. Therefore, the coating composition and structure can be adjusted in a targeted manner for different materials and sizes of processed materials:

[0066] 1. When there is no demand for high efficiency but only the desire to appropriately extend the sawing life, when processing ordinary mold steel, stainless steel, carbon steel and other materials, single-layer WC-Co-Cr coating or single-layer WC-CrC-Ni coating can be selected; when processing non-ferrous metals such as aluminum and copper and wood, single-layer WC-Co-Cr coating or single-layer WC-Co coating can be selected; when processing polymer materials with corrosive binders, WC-Ni coating or WC-CrC-Ni coating can be selected.

[0067] 2. On the basis of the above, if you want to further improve the cutting efficiency, you can choose WC-Ni layers and WC-Co-Cr layers, or WC-Ni layers and WC-CrC-Ni layers, which are arranged alternately from the saw teeth to the outside, with the number of layers being 2 to 10 layers, or WC-Co layers and WC-Co-Cr layers, or WC-Co layers and WC-CrC-Ni layers, which are arranged alternately from the saw teeth to the outside, with the number of layers being 2 to 10 layers.

[0068] 3. Furthermore, if the processed material is a difficult-to-process material such as high-hardness die steel, precipitation-hardened stainless steel or high-alloy steel, you can choose WC-Ni layer, WC-Co layer and WC-Co-Cr layer, or WC-Ni layer, WC-Co layer and WC-CrC-Ni layer, or WC-Ni layer, WC-Co-Cr layer and WC-CrC-Ni layer, or WC-Ni layer, WC-CrC-Ni layer and WC-Co-Cr layer, or WC-CrC-Ni layer, WC-Ni layer and WC-Co-Cr layer, or WC-CrC-Ni layer, WC-Ni layer and WC-Co-Cr layer, or WC-Co-Cr layer, WC-Ni layer and WC-CrC-Ni layer, and the number of layers is 3 to 9.

[0069] This application is aimed at sawing conditions with high efficiency, long life and difficult-to-process materials. By constructing a multi-component and multi-layer structure, the coated band saw blade can deflect cracks at the interface under the complex thermal-mechanical coupling conditions of vibration cutting, thereby delaying or preventing failure cracks from penetrating the entire coating and causing coating failure.

[0070] In addition, components with different compositions, different hardnesses and different toughnesses not only constitute WC-Ni layers and WC-Co-Cr layers, or WC-Ni layers and WC-CrC-Ni layers, or WC-Co layers and WC-Co-Cr layers, or WC-Co layers and WC-CrC-Ni layers, or WC-CrC-Ni layers, WC-Ni layers and WC-Co-Cr layers, or WC-Co-Cr layers, WC-Ni layers and WC-CrC-Ni layers, but also constitute WC-Ni layers, WC-Co layers and WC-Co-Cr layers, or WC-Ni layers, WC-Co layers and WC-CrC-Ni layers, which are alternately arranged in sequence from the teeth or tooth grooves with a hardness and toughness gradient outward. Through the transition of mechanical properties, the bonding strength between the coating and the band saw blade can also be improved, thereby achieving stable service of the coating.

[0071] In the embodiments of the present application, the material of the belt body is selected from carbon steel or spring steel, and the material of the teeth is selected from carbon steel, high-speed steel, or cemented carbide. The width of the belt body is 5 mm to 100 mm, and the thickness is 0.5 mm to 1.6 mm. Preferably, the width of the belt body is 13 mm to 80 mm. The saw teeth include multiple teeth, and several teeth form a tooth group. The number of teeth in a single tooth group is 3 to 7. With a unit length of 25.4 mm, the number of teeth per unit length is 0.5 to 6. The pitch of adjacent saw teeth can be unequal to improve cutting vibration.

[0072] In the embodiment of the present application, the tip of the tooth portion is a circular arc cutting edge, with a rake angle and a clearance angle. The blunt radius of the cutting edge is 5μm to 50μm; the rake angle is 0° to 20°, and the clearance angle is 10° to 45°. Preferably, the blunt radius of the cutting edge is 10μm to 35μm; the rake angle is 7° to 15°, and the clearance angle is 25° to 45°. The above-mentioned angle settings of the rake angle and clearance angle give the sawtooth good cutting performance; the setting of the circular arc cutting edge and its blunt radius makes the cutting edge sharp and has good anti-collision performance.

[0073] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other unless there is a conflict. The specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention.

[0074] Example 1

[0075] A coated band saw blade comprises a band body 1 and saw teeth. The saw teeth are arranged on the band body 1 and include teeth 2, tooth grooves 3, and a coating formed on the surfaces of the teeth 2 and the tooth grooves 3. The tooth grooves 3 are formed between adjacent teeth 2. The coating is a single layer of WC-10Co-4Cr with a thickness of 20 μm. The coating is produced by thermal spraying.

[0076] The belt body 1 is made of spring steel, and the teeth 2 are made of high-speed steel. The belt body 1 is 34mm wide and 1.1mm thick. Each tooth group 2 has seven teeth 2, with a unit length of 25.4mm. The number of teeth 2 per unit length is three, and the pitch between adjacent teeth can vary. The tooth tip of the tooth 2 is a circular arc edge with a rake angle and a clearance angle. The blunting radius of the edge is 15±3μm; the rake angle is 11°, and the clearance angle is double, with one rake angle of 30° and the other rake angle of 38°.

[0077] Example 2

[0078] This embodiment is basically the same as embodiment 1, except that the coating is a WC-10Co layer.

[0079] Example 3

[0080] This embodiment is basically the same as embodiment 1, except that the coating is a WC-10Ni layer.

[0081] Example 4

[0082] This embodiment is basically the same as embodiment 1, except that the coating is a WC-20Cr3C2-7Ni layer.

[0083] Example 5

[0084] This embodiment is basically the same as embodiment 1, except that the coating is a WC-10Ni layer and a WC-10Co-4Cr layer arranged alternately, each layer is 5 μm thick, a total of 4 layers are provided, and the total coating thickness is 20 μm.

[0085] Example 6

[0086] This embodiment is basically the same as embodiment 1, except that the coating is composed of WC-10Ni layers and WC-20Cr3C2-7Ni layers arranged alternately, each layer is 5 μm thick, and a total of 4 layers are provided, with a total coating thickness of 20 μm.

[0087] Example 7

[0088] This embodiment is basically the same as embodiment 1, except that the coating is composed of alternating WC-10Co layers and WC-10Co-4Cr layers, each layer is 5 μm thick, and a total of 4 layers are provided, with a total coating thickness of 20 μm.

[0089] Example 8

[0090] This embodiment is basically the same as embodiment 1, except that the coating is composed of WC-10Co layers and WC-20Cr3C2-7Ni layers arranged alternately, each layer is 5 μm thick, and a total of 4 layers are provided, with a total coating thickness of 20 μm.

[0091] Example 9

[0092] This embodiment is basically the same as embodiment 1, except that the coating is composed of WC-20Cr3C2-7Ni layers and WC-10Co-4Cr layers arranged alternately, each layer is 5 μm thick, and a total of 4 layers are provided, with a total coating thickness of 20 μm.

[0093] Example 10

[0094] This embodiment is basically the same as embodiment 1, except that the coating is composed of WC-10Ni layer, WC-10Co layer, and WC-10Co-4Cr layer arranged alternately, each layer is 7 μm thick, and a total of 3 layers are provided, with a total coating thickness of 21 μm.

[0095] Example 11

[0096] This embodiment is basically the same as embodiment 1, except that the coating is composed of WC-10Ni layer, WC-10Co layer, and WC-20Cr3C2-7Ni layer arranged alternately, each layer is 7 μm thick, and a total of 3 layers are provided, with a total coating thickness of 21 μm.

[0097] Example 12

[0098] This embodiment is basically the same as embodiment 1, except that the coating is composed of WC-10Ni layer, WC-20Cr3C2-7Ni layer, and WC-10Co-4Cr layer arranged alternately, each layer is 7 μm thick, and a total of 3 layers are provided, with a total coating thickness of 21 μm.

[0099] Example 13

[0100] This embodiment is basically the same as embodiment 1, except that the coating is composed of WC-10Ni layer, WC-10Co-4Cr layer, and WC-20Cr3C2-7Ni layer arranged alternately, each layer is 7 μm thick, and a total of 3 layers are provided, with a total coating thickness of 21 μm.

[0101] Example 14

[0102] This embodiment is basically the same as embodiment 1, except that the coating is composed of WC-10Co layers, WC-20Cr3C2-7Ni layers, and WC-10Co-4Cr layers arranged alternately, each layer is 7 μm thick, and a total of 3 layers are provided, with a total coating thickness of 21 μm.

[0103] Example 15

[0104] This embodiment is basically the same as embodiment 1, except that the coating is composed of WC-10Co layers, WC-10Co-4Cr layers, and WC-20Cr3C2-7Ni layers arranged alternately, each layer is 7 μm thick, and a total of 3 layers are provided, with a total coating thickness of 21 μm.

[0105] Comparative Example 1

[0106] This comparative example is basically the same as Example 1, except that the coating is a single-layer WC-6Co-4Cr layer with a coating thickness of 180 μm.

[0107] Comparative Example 2

[0108] This comparative example is basically the same as Example 1, except that no coating is provided on the tooth surface and the tooth groove surface.

[0109] The thickness, nanoindentation hardness, elastic modulus and H / E* ratio of the coatings in Examples 1 to 15 and Comparative Example 1 are shown in Table 1. Nanoindentation hardness and elastic modulus were characterized using a TTX-NHT equipped with a Berkovich diamond indenter produced by Anton Paar. 2 A nanoindenter was used with a maximum load of 10.0 mN, ensuring that the maximum indentation depth was less than 1 / 10 of the coating thickness. The hold time was 10.0 s, and both the loading and unloading rates were 20.0 mN / min. Each sample was tested 12 times. The maximum and minimum values ​​were removed from the final test result, and the remaining 10 results were averaged to ensure data validity.

[0110] From the results in Table 1, it can be seen that the hardness and H / E of Examples 5 to 15 are * The ratio is significantly higher than that of the coating in Comparative Example 1, which shows that the coating technology solution of the present application can achieve both excellent hardness and toughness.

[0111] Table 1 Test results of coatings in Examples 1 to 15 and Comparative Example 1

[0112]

[0113] The coated band saw blades of Examples 1 to 15 and Comparative Examples 1 to 2 were used to saw SUS304L stainless steel bars. The service life of the coated band saw blades is shown in Table 2. SUS304L stainless steel bars with a diameter of 200 mm were used for sawing. The hardness of the workpiece material was 271 HV. The sawing machine used was Chenlong G330. The constant efficiency mode was selected. The sawing linear speed was 28 m / min and the sawing efficiency was 20 cm. 2 / min. A band saw blade failure criterion was defined as a surface straightness exceeding 1.4 mm after sawing. Two band saw blades were tested for each example and comparative example, and the average sawing life was calculated.

[0114] As can be seen from the results in Table 2, the sawing lifespans of Examples 1 to 15 of the present application are all longer than those of Comparative Examples 1 and 2, especially Examples 5 to 15. The coated band saw blade of Comparative Example 1 does not have a significant lifespan advantage over the uncoated band saw blade of Comparative Example 2. This demonstrates that the present invention's coating technology, combining excellent hardness and toughness, can significantly extend the service life of coated band saw blades.

[0115] Table 2 Test results of band saw blades of Examples 1 to 15 and Comparative Examples 1 to 2

[0116]

[0117] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coated band saw blade, characterized in that: The invention comprises a belt body, saw teeth and a coating, wherein the saw teeth are arranged on the belt body, the saw teeth include tooth portions and tooth grooves, the tooth grooves are formed between two adjacent tooth portions, and the coating is formed on the surface of the tooth portions; the coating is selected from one or more of a WC-Co layer, a WC-Co-Cr layer, a WC-Ni layer, and a WC-CrC-Ni layer; and the total thickness of the coating is 3 μm to 120 μm.

2. The coated band saw blade according to claim 1, characterized in that The coating is formed on the surface of the tooth groove.

3. The coated band saw blade according to claim 1, characterized in that The total thickness of the coating is 10 μm to 30 μm.

4. The coated band saw blade according to claim 1, characterized in that The coating comprises WC-Ni layers and WC-Co-Cr layers which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 2 to 10 layers.

5. The coated band saw blade according to claim 1, characterized in that The coating comprises WC-Ni layers and WC-CrC-Ni layers which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 2 to 10 layers.

6. The coated band saw blade according to claim 1, characterized in that The coating comprises WC-Co layers and WC-Co-Cr layers which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 2 to 10 layers.

7. The coated band saw blade according to claim 1, characterized in that The coating comprises WC-Co layers and WC-CrC-Ni layers which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 2 to 10 layers.

8. The coated band saw blade according to claim 1, wherein: The coating comprises WC-CrC-Ni layers and WC-Co-Cr layers which are alternately arranged in sequence, and the total number of layers of the coating is 2 to 10 layers.

9. The coated band saw blade according to any one of claims 4 to 8, characterized in that The total thickness of the coating is 6 μm to 100 μm.

10. The coated band saw blade according to claim 1, wherein The coating comprises a WC-Ni layer, a WC-Co layer and a WC-Co-Cr layer which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 3 to 9 layers.

11. The coated band saw blade according to claim 1, wherein The coating comprises a WC-Ni layer, a WC-Co layer and a WC-CrC-Ni layer which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 3 to 9 layers.

12. The coated band saw blade according to claim 1, wherein The coating comprises a WC-Ni layer, a WC-Co-Cr layer and a WC-CrC-Ni layer which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 3 to 9 layers.

13. The coated band saw blade according to claim 1, wherein The coating comprises a WC-Ni layer, a WC-CrC-Ni layer and a WC-Co-Cr layer which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 3 to 9 layers.

14. The coated band saw blade according to claim 1, wherein The coating comprises a WC-Co layer, a WC-Co-Cr layer and a WC-CrC-Ni layer which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 3 to 9 layers.

15. The coated band saw blade according to claim 1, wherein The coating comprises a WC-Co layer, a WC-CrC-Ni layer and a WC-Co-Cr layer which are alternately arranged outward from the saw teeth, and the total number of layers of the coating is 3 to 9 layers.

16. The coated band saw blade according to any one of claims 10 to 15, characterized in that The total thickness of the coating is 9 μm to 90 μm.

17. The coated band saw blade according to claim 1, wherein The material of the belt body is selected from carbon steel or spring steel, and the material of the teeth is selected from carbon steel, high-speed steel or cemented carbide.

18. The coated band saw blade according to claim 17, wherein: The belt body has a width of 5mm to 100mm and a thickness of 0.5mm to 1.6mm.

19. The coated band saw blade according to claim 17, wherein: The tip of the tooth portion is an arc cutting edge with a front angle and a back angle. The blunting radius of the cutting edge is 5 μm to 50 μm; the front angle is 0° to 20°, and the back angle is 10° to 45°.

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