Bimetal band saw blade

Abstract

The utility model discloses a bimetal band saw blade which comprises a saw blade main body and a sawtooth structure, the sawtooth structure is fixedly connected to one edge of the saw blade main body through a welding seam, the sawtooth structure comprises a plurality of tooth sets, the tooth sets are continuously arranged to form a sawtooth period, tooth grooves are formed in the sawtooth main body and the sawtooth structure, and the tooth grooves are formed in the sawtooth main body and the sawtooth structure. The tooth set is provided with first sawteeth and second sawteeth, and the second sawteeth are located behind the first sawteeth in the cutting direction. By designing the special tooth shape and sawtooth arrangement mode, the band saw blade is not prone to tooth broaching, tooth collapsing and saw inclination, the saw cutting efficiency is higher when bundled materials are sawn, tooth top damage caused by excessive deep cutting or vibration is reduced, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting tools, in particular to a bimetallic band saw blade. Background Art

[0002] Bimetallic band saw blades refer to band saw blades whose tooth tips and tooth backs are made of different materials, and the tooth tips are welded to the tooth backs. Usually, the tooth tip material is high-speed steel, and the tooth back material is spring steel. The tooth material has high hardness, high wear resistance and high red hardness, making bimetallic band saw blades suitable for almost all types of metal sawing. They are often used to cut structural steel, alloy steel, bearing steel, stainless steel, mold steel, alloy steel and aluminum alloy. When dealing with different sawing materials and material structures, the sawing efficiency can be improved by changing the tooth tip structure and tooth tip arrangement, and problems such as broken teeth, pulled teeth and sawing bevel during the sawing process can be avoided.

[0003] Chinese patent number CN201620971260.8 provides a discontinuous sawing and strengthening tensile resistance type band saw blade, including a saw blade body and a plurality of saw teeth fixed on the saw blade body; the saw teeth are arranged in groups along the length direction of the saw blade body, and the corresponding saw teeth in each group have the same shape and arrangement order; there are three saw teeth in each group; compared with the prior art, the utility model has a simple and reasonable structure, the saw blade body and the saw teeth are fixedly connected, and the overall firmness of the band saw blade is increased; a discontinuous sawing and strengthening tensile resistance type band saw blade is provided; it is an ideal saw blade suitable for sawing steel and thin-walled round tubes; and the sawing accuracy and service life are improved. The utility model designs a discontinuous sawing and strengthening tensile resistance type band saw blade with a special tooth shape to reduce the tooth breakage and saw blade consumption caused by the band saw blade when sawing steel and thin-walled round tubes. With the above technical solution, under the high load environment of sawing bundled materials, the teeth of a single metal band saw blade are prone to breakage, causing great wear and tear on the saw blade. In addition, sawdust is not easy to remove during the sawing process, resulting in severe heat accumulation in the band saw blade, which reduces its service life. Utility Model Content

[0004] In view of the problems of tooth pulling, tooth chipping and sawing bevel that are easy to occur when using a single metal band saw blade to saw bundled materials in the prior art, the utility model proposes a bimetal band saw blade that is not prone to tooth pulling, tooth chipping and sawing bevel, has higher cutting efficiency when sawing bundled materials, avoids damage to the tooth tip caused by excessive cutting depth or vibration, and has a longer service life.

[0005] The specific technical solution of the utility model is:

[0006] A bimetallic band saw blade comprises a saw blade body and a sawtooth structure, wherein the sawtooth structure is fixedly connected to an edge of the saw blade body by a weld, the sawtooth structure comprises a plurality of tooth groups, wherein the plurality of tooth groups are arranged continuously to form a sawtooth period, the sawtooth body and the sawtooth structure are provided with tooth grooves, the tooth group is provided with a first sawtooth and a second sawtooth, and the second sawtooth is located behind the first sawtooth in the sawing direction. The sawtooth structure is composed of the tooth groups arranged continuously in a period, and the sawtooth mechanism is fixedly connected to the saw blade body by the weld. The tooth group is composed of two front and rear sawtooths, namely the first sawtooth and the second sawtooth, and the first sawtooth is located in front of the second sawtooth in the sawing direction.

[0007] Further, the tooth group includes a periodic tooth group and an interval tooth group, the interval tooth group is arranged at the head end and / or tail end of the sawtooth period, at least three periodic tooth groups are arranged in the same period, the tooth groove includes a periodic tooth groove arranged at the front side of the periodic tooth group along the sawing direction, an interval tooth groove arranged at the front side of the interval tooth group along the sawing direction, and a small tooth groove arranged between the first saw tooth and the second saw tooth, and the tooth groove is an arc or an arc and a straight line. The interval tooth groove is arranged at the head end or tail end of the sawtooth period, and can also be arranged at both the head end and the tail end.

[0008] Furthermore, the periodic tooth groove includes a first tooth groove located in the first position in the same periodic sawing direction, a second tooth groove located in the second position in the same periodic sawing direction, and a third tooth groove located in the third position in the same periodic sawing direction. The first tooth groove is composed of a circular arc, the second tooth groove and the third tooth groove are composed of a straight line located in the valley and two circular arcs, the spaced tooth groove is composed of a circular arc, and the widths of the first tooth groove, the second tooth groove and the third tooth groove increase successively, and the depth of the first tooth groove is less than or equal to the second tooth groove, the third tooth groove and the spaced tooth groove.

[0009] Furthermore, the valleys of the periodic tooth grooves and the spaced tooth grooves are located on the side of the weld away from the sawtooth structure, and the valleys of the small tooth grooves are located on the side of the weld away from the saw blade body. The depths of the periodic tooth grooves and the spaced tooth grooves exceed the weld, i.e., they are milled through during milling; the depth of the small tooth grooves does not exceed the weld, i.e., they are not milled through during milling.

[0010] Optionally, the depth range of the first tooth groove is 0.6 mm to 1.0 mm, the depth range of the spaced tooth groove, the second tooth groove and the third tooth groove is 1.0 to 1.5 mm, and the depth range of the small tooth groove is 0.4 mm to 0.6 mm.

[0011] Preferably, the height of the first sawtooth is in the range of 1.0 mm to 1.5 mm, the first sawtooth is higher than the second sawtooth, and the height difference between the first sawtooth and the second sawtooth is in the range of 0.08 mm to 0.12 mm.

[0012] Further, the rake face of the first sawtooth includes a first rake face that is an inclined straight line, a first arc that is an arc-shaped, the first rake face is connected to the first arc, the first arc is connected to the arc line of the previous tooth groove through a transition arc located on the weld, the back face of the first sawtooth is a first rake face that is an inclined straight line, the rake face of the second sawtooth is a second rake face that is a straight line, the back face of the second sawtooth includes a second rake face and a third rake face that are inclined straight lines and connected to each other, the third rake face is connected to the arc line of the next tooth groove through a transition straight line.

[0013] Preferably, the angle range of the first rake face is 5°~7°, the angle range of the first back face is 27°~32°, the second rake face is vertical, the angle range of the second back face is 27°~32°, and the angle range of the third back face is 56°~64°. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The front view of the bimetal band saw blade.

[0015] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0016] Figure 3 It is a schematic diagram of the first embodiment.

[0017] Figure 4 for Figure 1 The partial enlarged view at A in the figure is a schematic diagram of the first embodiment.

[0018] Figure 5 This is the first schematic diagram in the second embodiment.

[0019] Figure 6 This is the second schematic diagram in the second embodiment.

[0020] 1. Saw blade body; 2. Sawtooth structure; 21. Tooth group; 3. Welding seam; 4. Tooth groove; 211. Periodic tooth group; 212. Interval tooth group; 22. First saw tooth; 23. Second saw tooth; 221. First rake face; 222. First arc; 223. First back face; 231. Second rake face; 232. Second back face; 233. Third back face; 41. Periodic tooth groove; 42. Interval tooth groove; 43. Small tooth groove; 411. First tooth groove; 412. Second tooth groove; 413. Third tooth groove. DETAILED DESCRIPTION

[0021] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] The utility model provides a bimetallic band saw blade. The preferred embodiments of the bimetallic band saw blade are described below.

[0023] Embodiment 1

[0024] like Figure 1 and Figure 2 As shown, the bimetallic band saw blade is divided into two parts as a whole, the saw blade body 1 as the main body, and the sawtooth structure 2 fixedly connected to the saw blade body 1 by a weld 3, the sawtooth structure 2 includes a plurality of tooth groups 21, and the plurality of tooth groups 21 are arranged continuously to form the sawtooth structure 2, and the plurality of continuously arranged tooth groups 21 form a sawtooth cycle. A plurality of tooth grooves 4 are milled on the saw blade body 1 and the sawtooth structure 2. The sawtooth structure 2 includes two teeth, a first tooth 22 located at the front side of the sawing direction of the band saw blade and a second tooth 23 located at the rear side of the sawing direction of the band saw blade. The sawtooth structure 2 is made of different metal materials from the saw blade body. The sawtooth structure 2 can be made of high-speed steel to improve the wear resistance and high red hardness of the tooth tip, and has higher strength to improve the service life of the band saw blade. The saw blade body 1 can be made of spring steel. 3 / 4T variable teeth and 4 / 6T variable teeth are often used in actual sawing scenarios. The variable teeth mentioned in the utility model make up for the gap in the arrangement size of variable tooth band saw blades. At the same time, variable tooth band saw blades perform well in actual applications. Compared with single metal band saw blades, bimetallic band saw blades have better wear resistance, less hardness change in high temperature environment, and the tooth tip is less likely to break, and has a longer service life.

[0025] In the first embodiment, three periodic tooth groups 211 are arranged in each sawtooth period, which are the first tooth groove 411, the second tooth groove 412 and the third tooth groove 413 in sequence, and the size of the periodic tooth group 211 and the spaced saw teeth 22 are the same. The periodic tooth group 41 is arranged at the front end along the sawing direction of the band saw blade in each sawtooth period, and the spaced tooth groove 42 is arranged at the rear of the spaced tooth group 212 in the opposite direction of the sawing direction of the band saw blade. The valleys of the first tooth groove 411 and the spaced tooth groove 42 are arcs, and the arcs of the valleys are connected with the transition straight line of the tooth group before the sawing direction to form the first tooth groove. The valleys of the second tooth groove 412 and the third tooth groove 413 are composed of two arcs and a straight line between the two, and the previous arc in the sawing direction of the valley is connected with the transition straight line of the tooth group before the sawing direction to form the above two tooth grooves. The valleys of the periodic tooth groove 41 and the spaced tooth groove 42 are located below the weld 3, that is, they are milled through during milling. The widths of the first tooth groove 411, the second tooth groove 412 and the third tooth groove 413 increase successively, and the width of the interval tooth groove 42 is between the first tooth groove 411 and the second tooth groove 412. The depth of the first tooth groove 411 is less than that of the other tooth grooves, and the depths of the second tooth groove 412, the third tooth groove 413 and the interval tooth groove 42 are the same. The effect of the depth of the first tooth groove 411 being less than that of the other tooth grooves is to make the tooth group in front of the first tooth groove 411 have higher strength. The tooth grooves with increasing widths can reduce the vibration and resonance of the saw blade during the sawing process of the band saw blade, improve the stability of the saw blade during the sawing process, and make the chip removal smoother. At the same time, the versatility of the saw blade is also enhanced, and the size range of the materials to be sawed is larger, and it can be used flexibly in different sawing scenarios. The bimetallic band saw blade proposed by the utility model is used to cut bundles of threaded steel bars and square pipes. Such materials to be sawed vibrate greatly during sawing, and the design of different tooth groove widths, that is, the design of variable teeth can better adapt to such sawing scenarios.

[0026] The depth of the first tooth groove 411 is in the range of 0.6 mm to 1.0 mm, and the depth of the interval tooth groove 42, the second tooth groove 412 and the third tooth groove 413 is in the range of 1.0 to 1.5 mm. Figure 3 As shown, in the first embodiment, the depth of the first tooth groove 411 is 0.93 mm, and the depths of the second tooth groove 412, the third tooth groove 413 and the spacer tooth groove are 1.1 mm.

[0027] like Figure 2As shown, the sawtooth structure 2 includes a first sawtooth 22, a second sawtooth 23, and a small tooth groove 43 between the two. The valley of the small tooth groove 43 is an arc, and the valley is located above the weld 3, that is, it is milled through during milling. The front cutting surface of the first sawtooth 22 is composed of a first front cutting surface 221 in an inclined straight line and a first arc 222, and the first arc 222 is connected to the arc of the previous tooth groove in the sawing direction. The back cutting surface of the first sawtooth 22 is a first back cutting surface 223 in an inclined straight line, and the first back cutting surface 223 intersects with the first front cutting surface 221 to form the tooth tip of the first sawtooth 22, and the first back cutting surface 223 extends in the opposite direction of the sawing direction and connects with the arc of the valley of the small tooth groove 43. The rake face of the second sawtooth 23 is a vertical straight line, connected with the arc of the valley of the small tooth groove 43. The second back face 232 and the third back face 233 are both inclined straight lines, and the two intersect to form the raised back angle of the second sawtooth 23. The second rake face 241231 intersects with the second back face 232 to form the tooth tip of the second sawtooth 23. The third back face 233 extends in the opposite direction of the sawing direction through a transition straight line and connects with the arc of the tooth groove 4 behind the tooth group 21. The tooth tip height of the first sawtooth 22 is slightly higher than the tooth tip height of the second sawtooth 23, that is, the first sawtooth 22 serves as the main sawing tooth of the saw blade during sawing, and the second sawtooth 23 serves as the auxiliary sawtooth.

[0028] The depth of the small tooth groove 43 is in the range of 0.4mm~0.6mm, the height of the first sawtooth 22 is in the range of 1.0mm~1.5mm, the height difference between the first sawtooth 22 and the second sawtooth 23 is in the range of 0.08mm~0.12mm, the angle of the first front cutting edge 221 is in the range of 5°~7°, the angle of the first back cutting edge 223 is in the range of 27°~32°, the angle of the second back cutting edge 232 is in the range of 27°~32°, and the angle of the third back cutting edge 233 is in the range of 56°~64°. The width of the weld 3 is 1 / 3 of the thickness of the saw blade body 1, and the length of the weld 3 of each group of teeth 21 is in the range of 2.5~3.2mm. Figure 4As shown, the front angle of the first saw tooth 22 is α, and α is equal to 6°, the back angle is β, and β is equal to 29°; the front angle of the second saw tooth 23 is vertically 0°, the first back angle is γ, and γ is equal to 29°, the second back angle is θ, and θ is equal to 60°, and the length of the weld 3 of each tooth group 21 is 2.7 mm. The width and length of the weld 3 affect the strength of the tooth group 21. The longer length of the weld 3 makes the tooth group 21 have better impact resistance and is not easy to fall off in a high-load sawing scenario. Currently, 3 / 4T or 4 / 6T variable-tooth band saw blades with a front angle of 5° or 7° are common on the market. Such saw blades have low sawing efficiency when sawing bundles of threaded steel bars or bundles of square tubes, and are prone to tooth breakage, tooth pulling or sawing, which affects the life of the band saw blade. The first embodiment of the utility model is a 4 / 5T variable tooth bimetallic band saw blade, and the rake angle of the first saw tooth 22 is designed to be 6°. After a large number of tests, it is found that when the first saw tooth 22 has a rake angle of 6°, the sawing efficiency and durability of the variable tooth band saw blade are relatively better. In addition, the second saw tooth 23 can increase the stress that the first saw tooth 22 can withstand during the sawing process, and the tooth back formed by the second back blade surface 232 and the third back blade surface 233 can improve the strength of the second saw tooth 23. At the same time, the small tooth groove 43 between the first saw tooth 22 and the second saw tooth 23 can accommodate coolant, which plays a role in cooling during the sawing process. The tooth height of the first saw tooth 22 is 1.05mm, and the tooth height of the second saw tooth 23 differs from the tooth height of the first saw tooth 22 by 0.08mm. The second saw tooth 23 is slightly smaller than the first saw tooth 22 in tooth height, which is beneficial to the removal of sawdust during sawing. The raised back angle of the second saw tooth 23 forms a protective step, which improves the tensile strength of the second saw tooth 23, thereby enhancing the tensile strength of the tooth group 21 and preventing excessive sawing, which is more suitable for the scenario of bundle sawing. After a large number of tests, it was found that when the first back angle γ (the inclination angle of the second back blade surface 232) of the second saw tooth 23 is 29° and the second back angle θ (the inclination angle of the third back blade surface 233) is 60°, the tensile strength of the second saw tooth 23 and the tooth group 21 is relatively better.

[0029] The movement process of the band saw blade in the first embodiment is described below:

[0030] The band sawing machine with the band saw blade installed is started, and the sawtooth structure 2 arranged in a periodic and continuous manner on the saw blade body 1 moves in the sawing direction. During the sawing process, the tooth tips of the first saw teeth 22 of the plurality of tooth groups 21 form a first sawing line, and the plurality of second saw teeth 23 form a second sawing line. The object to be sawed is sawed along the first sawing line and the second sawing line, wherein the sawdust cut by the first saw teeth 22 in the sawing state falls into the tooth groove 4 before the sawing direction, and the sawdust cut by the second saw teeth 23 in the sawing state falls into the small tooth groove 43, and is sawed and discharged after leaving the sawing state. At the same time, the tooth groove 4 and the small tooth groove 43 can accommodate part of the coolant to cool the tooth group 21 of the saw blade body 1. Due to the arrangement of the variable teeth of the sawtooth structure 2, the sawing process has less noise and vibration than that of a single metal equal-tooth band saw blade.

[0031] Embodiment 2

[0032] like Figure 5 As shown, the bimetallic band saw blade is divided into two parts as a whole, the saw blade body 1 as the main body, and the sawtooth structure 2 fixedly connected to the saw blade body 1 by a weld 3, the sawtooth structure 2 includes a plurality of tooth groups 21, and the plurality of tooth groups 21 are arranged continuously to form the sawtooth structure 2, and the plurality of continuously arranged tooth groups 21 form a sawtooth cycle. A plurality of tooth grooves 4 are milled on the saw blade body 1 and the sawtooth structure 2. The sawtooth structure 2 includes two saw teeth, a first saw tooth 22 located at the front side of the sawing direction of the band saw blade and a second saw tooth 23 located at the rear side of the sawing direction of the band saw blade. The sawtooth structure 2 can be made of high-speed steel, and the saw blade body 1 can be made of spring steel. The difference from the first embodiment is that in each sawtooth period in the second embodiment, three periodic tooth groups 211 are provided, which are the first tooth groove 411, the second tooth groove 412 and the third tooth groove 413, respectively, and the sizes of the periodic tooth groups 211 and the spaced saw teeth 22 are the same, and the periodic tooth groups 41 are provided at the front and rear ends of each sawtooth period, and the spaced tooth grooves 42 are provided behind the spaced tooth groups 212 in the opposite direction of the sawing direction of the band saw blade. Compared with the arrangement of the tooth groups 21 in the first embodiment, the advantage of providing the spaced tooth groups 212 at the head and tail ends of each sawtooth period is that the spaced tooth groups 212 account for a larger proportion in the sawtooth structure 2, the force on the material to be sawed during the sawing process is more uniform, the sawing plane is relatively flat, and it is suitable for sawing bundles of small-diameter materials, such as bundles of threaded steel bars.

[0033] like Figure 6As shown, the depth of the first tooth groove 411 given in the second embodiment is 0.93mm, the depth of the second tooth groove 412, the third tooth groove 413 and the interval tooth groove is 1.1mm, and the length of the weld 3 is 2.5mm. The angle of the first sawtooth 22 with the second sawtooth 23 refers to the first embodiment, the front angle of the first sawtooth 22 is 6°, the back angle β is 29°, the front angle of the second sawtooth 23 is 0° vertically, the first back angle γ is 29°, and the second back angle θ is 60°. Compared with the first embodiment, the weld 3 is slightly reduced, thereby reducing the spacing of each group of tooth groups 21, and the arrangement of the sawtooth structure 2 is more dense, which is more suitable for sawing bundles of small-diameter materials.

[0034] In summary, in order to cope with the problems of easy tooth breakage, tooth pulling and sawing skewness in the bimetallic band saw blades of the prior art when sawing bundled materials, the bimetallic saw blade proposed in the utility model is designed with a special tooth angle and tooth arrangement, so that the teeth of the band saw blade have good strength and impact resistance, which effectively reduces the above-mentioned problems, and has low noise and relatively high sawing efficiency.

[0035] In addition to the above-mentioned embodiments, within the scope disclosed in the claims and the specification of the utility model, the technical features of the utility model can be reselected and combined to form new embodiments, which can be achieved by those skilled in the art without creative work. Therefore, these embodiments that are not described in detail in the utility model should also be regarded as specific embodiments of the utility model and within the protection scope of the utility model.

Claims

1. A bimetallic band saw blade, comprising a saw blade body and a saw tooth structure, characterized in that: The sawtooth structure is fixedly connected to an edge of the saw blade body by a weld, the sawtooth structure includes a plurality of tooth groups, and the plurality of tooth groups are continuously arranged to form a sawtooth period, tooth grooves are provided on the sawtooth body and the sawtooth structure, the tooth group is provided with a first sawtooth and a second sawtooth, and the second sawtooth is located behind the first sawtooth in the sawing direction.

2. A bimetallic band saw blade according to claim 1, characterized in that: The tooth group includes a periodic tooth group and an interval tooth group. The interval tooth group is arranged at the head end and / or the tail end of the sawtooth period. At least three periodic tooth groups are arranged in the same period. The tooth groove includes a periodic tooth groove arranged at the front side of the periodic tooth group along the sawing direction, an interval tooth groove arranged at the front side of the interval tooth group along the sawing direction, and a small tooth groove arranged between the first saw tooth and the second saw tooth. The tooth groove is arc-shaped or formed by splicing an arc and a straight line.

3. A bimetallic band saw blade according to claim 2, characterized in that: The periodic tooth grooves include a first tooth groove located at the first position in the same periodic sawing direction, a second tooth groove located at the second position in the same periodic sawing direction, and a third tooth groove located at the third position in the same periodic sawing direction. The valley of the first tooth groove is an arc, the valleys of the second tooth groove and the third tooth groove are formed by splicing straight lines and arcs, the valley of the spaced tooth groove is an arc, and the widths of the first tooth groove, the second tooth groove and the third tooth groove increase sequentially.

4. A bimetallic band saw blade according to claim 3, characterized in that: The valleys of the periodic tooth grooves and the spaced tooth grooves are located on a side of the weld away from the sawtooth structure, and the valleys of the small tooth grooves are located on a side of the weld away from the saw blade body.

5. A bimetallic band saw blade according to claim 3, characterized in that: The depth range of the first tooth groove is 0.6 mm to 1.0 mm, the depth range of the spacer tooth groove, the second tooth groove and the third tooth groove is 1.0 to 1.5 mm, and the depth range of the small tooth groove is 0.4 mm to 0.6 mm.

6. A bimetallic band saw blade according to claim 1, characterized in that: The height of the first sawtooth is in the range of 1.0 mm to 1.5 mm, the first sawtooth is higher than the second sawtooth, and the height difference between the first sawtooth and the second sawtooth is in the range of 0.08 mm to 0.12 mm.

7. A bimetallic band saw blade according to any one of claims 1 to 4, characterized in that: The rake face of the first sawtooth includes a first rake face that is an inclined straight line and a first arc that is an arc. The first rake face is connected to the first arc. The first arc is connected to the arc line of the previous tooth groove through a transition arc located on the weld. The back face of the first sawtooth is a first rake face that is an inclined straight line. The rake face of the second sawtooth is a second rake face that is a straight line. The back face of the second sawtooth includes a second rake face and a third rake face that are inclined straight lines and connected to each other. The third rake face is connected to the arc line of the next tooth groove through a transition straight line.

8. A bimetallic band saw blade according to claim 7, characterized in that: The angle range of the first rake face is 5°~7°, the angle range of the first flank face is 27°~32°, the second rake face is vertical, the angle range of the second flank face is 27°~32°, and the angle range of the third flank face is 56°~64°.

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