WO2019100271A1

WO2019100271A1 - Band saw blade and manufacturing method therefor

Info

Publication number: WO2019100271A1
Application number: PCT/CN2017/112454
Authority: WO
Inventors: 海顿⋅罗伯特; 贾寓真; 郭喜如; 余畅
Original assignee: 湖南泰嘉新材料科技股份有限公司
Priority date: 2017-11-23
Filing date: 2017-11-23
Publication date: 2019-05-31
Also published as: CN109311107A; CN109311107B

Abstract

A band saw blade and a manufacturing method therefor. The band saw blade comprises a saw blade body and saw teeth; the saw teeth are repeatedly arranged according to a plurality of main loops, each main loop being formed by a plurality of arranged sub-tooth sub-loops, and the main loop also follows the arrangement rule of the plurality of geometric sub-loops; each sub-tooth sub-loop includes at least three sub-teeth, and the orders of the sub-teeth in every two adjacent sub-teeth sub-loops are different; each geometric sub-loop comprises a plurality of sub-teeth, and the spacing between saw teeth in the same geometric sub-loop are different. The band saw blade has a prolonged service life, reduces noise and vibration, and ensures smoothness and flatness of the surface of a cut workpiece.

Description

Band saw blade and manufacturing method thereof

Technical field

The invention relates to a band saw blade and a manufacturing method thereof, and belongs to the field of band saw design and manufacture.

Background technique

Band saw blades have been used for the machining of difficult-to-cut materials such as tool steel, die steel and bearing steel. Compared with the circular saw, its main advantage is that it is thinner than the circular saw, so it is more material-saving. However, when the feed resistance of the cutting edge is large, the band saw blade will lose its torsional rigidity, which limits the application of the band saw blade. This condition will cause the band saw blade to flex, as if it were treated as a beam, the edge of the serrated side will be subjected to compressive stress. When this compressive stress is offset by the tensile stress formed when the saw blade is tensioned, the torsional rigidity of the saw blade will be greatly reduced. This means that the toothed arrangement is designed to reduce the feed force and other component forces that cause the band saw blade to twist. Designed like this, some of the straight teeth are higher than the split teeth of the band saw blade, and the height and width of the teeth are not equal, the so-called "three-chip" tooth profile.

The effective way to reduce the lateral force of the band saw blade is to have the left and right teeth appear in pairs, so that the larger lateral forces cancel each other out. If the distance between them is small enough, the lateral forces between them can be mutually constrained when in the cutting state. However, a small distance means that more teeth will be cut at the same time when cutting the workpiece, resulting in a larger feed force, which is not desirable. In addition, it is not advisable to have only a small feed force on each tooth, which means lower cutting efficiency and at the same time aggravate the wear of the tooth tip.

Another problem is that when many feed forces work at the same time, because of the low section stiffness, there is a high risk of vibration when cutting at equal distances, which causes vibration, noise, rough cut surface, and lower belt. Saw blade life. The reduction in the life of the band saw blade is caused by vibration causing damage to the tip of the tooth. Into. If only a few teeth are cut at the same time, the lateral forces will not be balanced, causing the surface of the workpiece that has been cut to be corrugated. There is an experience for this: at least three sawtooth teeth involved in cutting are in contact with the workpiece at the same time.

The above problems have led to the design of an ideal band saw blade suitable for sawing workpieces of different thicknesses, hardnesses and shapes. This situation suggests a very long tooth cycle. High and low tooth profiles can be used not only to guide lateral forces, but also to maintain reasonable cutting efficiency when sawing difficult materials, while still having more sawtooth participation when sawing soft materials. Sawing.

The variable pitch can be used to avoid the occurrence of resonance, and the left and right teeth are paired and are of equal height. The variable tooth amount is able to divide the kerf width into more chips, thereby improving chip formation and increasing chip thickness. The conventional splitting tooth has three serrations of "left split tooth - no split tooth - right split tooth", but 5 or more saw teeth are also one cycle of split teeth, and the low tooth splitting amount is larger than The amount of teeth of the high teeth.

For conventional production, the serrations are arranged in a regular pattern, corresponding to the cycle of grinding, milling, stamping and splitting dies. Long cycle cycles require larger tools and machinery that are expensive and difficult to obtain. There is a special case in which a band saw blade is invented in the U.S. Patent No. 2004/0255749 A1, the cycle of the split tooth cycle and the geometry of the groove are different.

In most of the patents, many of the splitting methods, including the varying teeth, are not mentioned in themselves, but are also included in the patent as part of a particular splitting geometry. These declared tooth profiles achieve a limited number of main cycles of sawing teeth through a combination of different tooth heights, pitches and teeth, the length of which is limited by the sawtooth shaping and the tooth splitting device. In the 19th right description of the US Pat. No. 4,727,788 and the US Pat. No. 5,410,935, a set of teeth has only 5 serrations. For band saw blades with a large pitch, this limits the maximum length of the sawtooth cycle to only about 5 inches.

Summary of the invention

The invention aims to provide a band saw blade and a manufacturing method thereof, which are not limited by the conventional process when milling and dividing teeth, and the purpose thereof is only to improve the life of the band saw blade, reduce noise, reduce vibration, and make after cutting. The surface of the workpiece is smooth and flat. Especially in the sawing of large workpieces with a size of 500mm or more, there is a significant advantage.

In order to achieve the above object, the technical solution adopted by the present invention is:

A band saw blade, comprising a saw blade body and a saw tooth; the structural feature is that the saw teeth are repeatedly arranged according to a plurality of main loops, each main loop is arranged by a plurality of sub-tooth sub-cycles, and the main loop also follows multiple The arrangement of the geometric sub-cycles; each sub-tooth sub-cycle includes at least three partial teeth, and the order of the teeth in the adjacent two sub-tooth sub-cycles is different, and the teeth of the teeth outside the saw blade body are larger than the teeth near the inner side. The amount of teeth; each geometry sub-cycle includes a plurality of teeth, and the pitch of the teeth in the same geometric sub-cycle is different; the number of teeth in the geometric sub-cycle is not between the number of teeth in the sub-circle Form an integral multiple.

Thus, the saw teeth of the band saw blade of the present invention are arranged and circulated in a certain order within one main cycle. Each main cycle includes multiple geometric sub-cycles and sub-tooth sub-cycles, that is, the main cycle can be regarded as being arranged by multiple geometric sub-cycles, or as a plurality of sub-sub-cycles. Made. At the same time, the number of teeth in the geometric sub-cycle does not form an integral multiple with the number of teeth in the sub-circle, that is to say the geometric (referring to the geometry of the groove) sub-circulation and the division (including the amount of teeth and the height of the sawtooth) The number of repetitions of the loop is different. The invention reduces the cutting force, so that the saw blade is always kept tight and avoids the skew.

According to an embodiment of the present invention, the present invention can be further optimized, and the following is a technical solution formed after optimization:

According to an embodiment of the present invention, a sub-tooth sub-cycle in the main loop is a set of five teeth, and the order of the teeth is: no split teeth, half split teeth left split teeth, half split teeth right split teeth, standard Left and standard right-toothed, or non-separating, semi-fractional right-handed, half-partial left-handed, standard right-handed and standard left-handed; said standard left and standard right The amount of teeth is larger than the number of teeth of the semi-fractional and semi-fractional right-handed teeth; preferably, the standard left-toothed and standard right-splitting teeth have a torsion angle of 5.5°-6.5°, standard left and standard right The pitch angle of the split teeth is 6.5°-7.5°. More preferably, the non-separating, semi-fractional, and left-handed teeth have the same tip height and are higher than the tip height of the standard left and standard right-toothed teeth.

According to an embodiment of the present invention, a certain six-tooth set in a sub-tooth cycle in the main loop, the order of the teeth is: a first split-free, a half-split left split, a half-split right split , second split tooth, standard left split and standard right split, or first split split, half split split right split, half split split left split, second split split, standard right split and standard The left splitting teeth; the standard left splitting teeth and the standard right splitting teeth are larger than the semi-fractional left splitting teeth and the semi-fractional right splitting teeth; preferably the standard left splitting teeth and the standard right splitting teeth The torsion angle is 5.5°-6.5°, and the inclination angle of the standard left and standard right teeth is 6.5°-7.5°. More preferably, the first non-separating, semi-fractional left-tooth, half-to-right-right and second-non-toothed teeth have the same height and are higher than the standard left and standard right-tooth. Tip height.

According to an embodiment of the invention, a sub-tooth sub-cycle in the main loop is a set of seven teeth, and the order of the teeth is: no split teeth, small split teeth left split teeth, small split teeth right split teeth , half-toothed left-toothed, half-segmented right-splitting, standard left-segment and standard right-segment, or no-tooth, small-segment right-segment, small-segment left-tooth, half-segment right Split tooth, half split tooth left split tooth, standard right split tooth and standard left split tooth; the standard left split tooth and standard right split tooth have larger split teeth than half split teeth left split and half The amount of teeth of the right-toothed teeth of the right-toothed teeth is larger than that of the small-toothed-toothed-toothed-toothed-toothed-toothed-toothed-toothed-toothed-toothed-tooth Preferably, the standard left splitting teeth and the standard right splitting teeth have a torsion angle of 5.5°-6.5°, and the standard left splitting teeth and the standard right splitting teeth have an edge inclination angle of 6.5°-7.5°. More preferably, the non-separating, small-toothing left-toothed, small-segmented right-toothed, half-segmented left-toothed, and half-segmented right-handed teeth have the same tooth height, and are higher than the standard Tip height of the left and standard right teeth.

In the present invention, the standard left and the right right teeth mean that the amount of teeth is the same as or similar to the amount of teeth of the standard bimetal band saw blade.

Based on the same inventive concept, the present invention also provides a method for manufacturing the band saw blade, which comprises the following steps:

a) machining the band saw blade into a geometric sub-circle sawtooth;

b) quenching and tempering the processed band saw blade;

c) the quenched and tempered band saw blade is used to grind the rake face of the sawtooth, and the rake saw blade front angle formed by the machining is 0°-20°;

d) grinding the serrated flank surface, that is, the top grinding, the rear corner of the sawtooth saw blade after grinding is 25°-35°;

e) According to the rule of the serrations, the individual serrations are divided according to the rule of the subtooth cycle, that is, the band saw blade is formed.

In the manufacturing method of the present invention, the quenching and tempering treatments are carried out using standard processes and will not be described again.

The band saw blade is a bi-metal band saw blade.

The saw teeth of the band saw blade are processed by laser cutting or milling. Therefore, the invention is further unique in that the sawtooth of the band saw blade is processed by laser cutting or milling, and then face grinding and top grinding are respectively performed, and then the teeth are divided. The tooth splitting direction and the number of teeth of each tooth have compared with the conventional split teeth. Larger blade inclination.

Preferably, the band saw blade has a length of at least 150 meters.

Compared with the prior art, the invention has the beneficial effects that the saw blade of the band saw blade is processed by laser cutting or milling, and then separately ground and top-grinded, and then divided. The tooth splitting direction and the splitting amount of each tooth have a larger blade inclination than conventional split teeth.

Another advantage of the present invention is the ability to improve the geometry of the teeth. In the present invention, a single serrated tooth is used, and the torsion angle and the blade inclination angle of the serration after the tooth division are larger (as shown in Fig. 4), thereby reducing the lateral force of the sharp edge position of the saw blade, and ensuring that the band saw blade remains at the center of the saw seam when sawing. on-line. The standard splitting teeth of the band saw blade of the present invention have a torsion angle of 6 ± 0.5°, while the conventional band saw blade has a torsion angle of 4 ± 0.5°. The standard splitting of the band saw blade of the present invention has an edge inclination of 7 ± 0.5°, while the conventional band saw blade has a blade inclination of 5 ± 0.5°. The increase in these two angles reduces the side wear of the teeth and reduces the effective lateral force, which in turn increases the life of the band saw blade.

After grinding, the smoothness of the rake face of the saw blade is significantly improved, which greatly reduces the "sticky" phenomenon of the rake face during sawing, that is, the formation of "built-up edge". If a built-up edge is formed, the surface of the cut surface will be rough.

Further advantages of the invention are embodied in the embodiments.

DRAWINGS

Figure 1 is a schematic structural view of an embodiment of the present invention;

Figure 2 is a partial plan view of Figure 1;

Figure 3 is a schematic view of the teeth in a component tooth cycle of the present invention;

Figure 4 is a schematic illustration of the torsion angle and the cutting angle of the present invention.

Detailed ways

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present invention and the features in the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left", and "right" appear below, and only indicate the same as the upper, lower, left, and right directions of the drawing itself, and do not limit the structure.

The band saw blade of the present invention consists of a steel band and a saw tooth. As shown in Figure 1, the teeth are repeatedly arranged in a regular main loop, with each set of main loops containing repeated geometric sub-cycles and sub-tooth sub-cycles. The geometric sub-cycle consists of 3 or more different saw teeth and different grooves. Each component tooth cycle contains at least 5 types, namely standard left splitting, half splitting left splitting, no splitting, half splitting right splitting and standard right splitting, and repeat the above scores in one cycle. Tooth mode. The tip heights of the split and split teeth are the same and are higher than the tip height of the standard split teeth (see Figures 2 and 3). The 5-tooth or 6-tooth set of split teeth includes five different types of split teeth. The 7-tooth set of teeth includes 7 types of split teeth, namely standard left split teeth, half split teeth left split teeth, small split teeth left split teeth, no split teeth, small split teeth right split teeth, Half-toothed right-handed teeth, standard right-handed teeth. The standard split teeth are actually the same split teeth, the split teeth of the half split teeth are smaller than the standard split teeth, and the split teeth of the small split teeth are smaller than the half split teeth.

Each set of main loops consists of a geometric sub-cycle and a split-tooth sub-cycle, and the number of two sub-cycle repetitions cannot be a multiple relationship, that is, a 5-tooth set of sub-tooth sub-cycles, and the geometric sub-cycle may contain 4, 6, 7 8,8, but not 5 or 10. The main loop consisting of a 5-tooth set of sub-tooth sub-cycles and a 6-tooth set of geometric sub-cycles consists of 30 teeth (Fig. 1), correspondingly, a 5-tooth set of sub-tooth sub-cycles and a 7-tooth set The main loop of the geometric sub-cycle consists of 35 teeth.

For a 5-tooth set of sub-tooth sub-cycles, the first tooth is not divided, and then the teeth are divided as follows: half The splitting amount is the left splitting tooth, the half splitting tooth right dividing tooth, the standard left splitting tooth and the standard right splitting tooth. The order of the 6-tooth and one-component tooth cycle is: the first non-separating tooth, the semi-dividing tooth left-dividing tooth, the half-dividing tooth right-dividing tooth, the second non-dividing tooth, the standard left-division tooth, the standard right-division tooth . The order of the teeth of a group of 7 teeth is: the first one is not divided, the small is the left, the small is the right, the half is the left, the half is the right, the standard is the left. Tooth, standard right tooth. In general, the greater the number of teeth, the greater the number of high teeth. The tooth height and the amount of the teeth are inversely related, that is, the lower the tooth, the larger the amount of the tooth. The direction of the teeth of the split teeth can be changed. For example, the left split teeth become the right split teeth, and the corresponding right split teeth become the left split teeth.

In Figures 1-3, the first two digits represent the subtooth cycle, where the first number represents the sequence of the subtooth cycle, such as 2 for the second subtooth cycle; the second number represents the sub The sawtooth sequence in the cycle, where 1 means no teeth, high teeth, 2 means half-toothed left-toothed, high-toothed, 3 means half-toothed right-toothed, high-toothed, 4 means standard left-toothed, low-toothed, 5 indicates standard right splitting teeth and low teeth. The last two letters represent the geometry sub-cycle, where the first letter represents the sequence of the geometry sub-loop, and the second letter represents the zigzag sequence in the sub-cycle, such as cd representing the fourth sawtooth in the third geometry sub-loop . For example, 51dc represents the non-divided and high-tooth of the fifth sub-tooth sub-cycle, and is the third sawtooth in the fourth geometric sub-cycle. For example, 32bf represents the semi-divided amount of the third sub-tooth sub-circle. The tooth, the high tooth, and the fifth sawtooth in the second geometric sub-cycle, and so on, will not be described again.

The production process of the band saw blade of the present invention comprises the following operations:

a) By laser cutting or milling into a preliminary geometric sub-cycle, the processed bi-metal band saw blade can be up to 150 meters in length.

b) The treated bi-metal band saw blade is subjected to quenching and tempering treatment.

c) The bi-metal band saw blade after quenching and tempering is used to grind the serrated rake face with CBN grinding wheel, and the rake angle formed by the processing is 0°-20°.

d) Grind the serrated flank with a CBN grinding wheel, ie top grinding, after grinding, the back angle is 25°-35°.

e) The individual serrations are divided according to the law of the sub-tooth cycle.

In addition to surface treatment and packaging, the above steps substantially complete the production process.

The first advantage of grinding is the higher precision compared to conventional milling. The precision of milling can only reach ±0.025mm, and the precision of grinding can reach ±0.005mm. Moreover, the surface finish of the grinding is higher, and the sharp edge of the saw blade is sharper after the teeth are divided, thereby reducing the lateral force during cutting and improving the cutting performance. The reduction of the lateral force ensures that the band saw blade is always in the middle of the kerf when sawing, thus reducing the occurrence of the slanting.

The width of the band saw blade is much larger than its thickness, but it still follows the deflection of the beam. As the cutting force increases, the band saw blade will flex as a beam, causing compressive stress on the serrated edges. However, due to the tension of the saw wheel, the band saw blade will form tensile stress. The tensile stress will remain until the compressive stress exceeds the tensile stress. When the compressive stress exceeds the tensile stress, the serrated edge will lose tension and will not remain at the centerline of the kerf, resulting in easy skewing.

The main object of the invention is therefore to reduce the cutting forces as much as possible so that the saw blade is always kept tight and avoids skewing.

Another advantage is the ability to improve the geometry of the teeth. In the present invention, a single serrated tooth is used, and the torsion angle and the blade inclination angle of the serration after the tooth division are larger (as shown in Fig. 4), thereby reducing the lateral force of the sharp edge position of the saw blade, and ensuring that the band saw blade remains at the center of the saw seam when sawing. on-line. The standard tooth of the conventional belt of the present invention has a torsion angle of 6 ± 0.5°, while the conventional band saw blade has a torsion angle of 4 ± 0.5°. The standard splitting of the conventional belt of the present invention has an edge inclination of 7 ± 0.5°, while the conventional band saw blade has an edge inclination of 5 ± 0.5°. The increase in these two angles reduces the side wear of the teeth and reduces the effective lateral force, which in turn increases the life of the band saw blade.

The sharpness of the rake face of the saw blade is significantly improved after grinding, which reduces the “stickiness” of the rake face during sawing. Phenomenon, the formation of "built-up edge". If a built-up edge is formed, the surface of the cut surface will be rough. The above-described embodiments are to be understood as being illustrative only and are not intended to limit the scope of the present invention. Modifications are intended to fall within the scope defined by the appended claims.

Claims

A band saw blade, comprising a saw blade body and a saw tooth; wherein the saw tooth is repeatedly arranged according to a plurality of main loops, each main loop is arranged by a plurality of sub-tooth sub-cycles, and the main loop also follows a plurality of geometries Arrangement of sub-cycles;

Each of the sub-tooth sub-cycles includes at least three partial teeth, and the order of the teeth in the adjacent two-toothed sub-cycles is different, and the amount of teeth of the teeth outside the saw blade body is larger than the amount of teeth of the teeth near the inner side;

Each geometric sub-cycle includes a plurality of split teeth, and the pitch of the teeth of the tooth groove in the same geometric sub-cycle is different;

The number of teeth in the geometric sub-cycle does not constitute an integral multiple between the number of teeth in the sub-circle sub-cycle.
The band saw blade according to claim 1, wherein a sub-tooth sub-cycle in the main cycle is a set of five teeth, and the order of the teeth is: no split teeth, half split teeth left split teeth, half minutes Tooth right split, standard left split and standard right split, or split split, half split right split, half split left split, standard right split and standard left split; The tooth volume of the tooth and the standard right tooth are larger than the half tooth and the half tooth and the right tooth; the standard left tooth and the standard right tooth have a twist angle of 5.5°-6.5°. The standard left and the standard right teeth have a blade inclination of 6.5° to 7.5°.
The band saw blade according to claim 2, wherein the non-separating, semi-fractional, and left-handed teeth have the same tooth tip height and are higher than the standard left and standard right. The height of the tip of the tooth.
The band saw blade according to claim 1, wherein a plurality of sub-tooth cycles in the main cycle are a group of six teeth, and the order of the teeth is: first non-divided, half-divided left-toothed Half The split tooth amount right split tooth, the second split split tooth, the standard left split tooth and the standard right split tooth, or the first split tooth, the half split tooth right split tooth, the half split tooth left split tooth, the second split tooth, Standard right and standard left teeth; the standard left and standard right teeth are larger than the half and half of the right and the right and the right The torsion angle of the standard right and the standard right teeth is 5.5°-6.5°, and the angle of the standard left and standard right teeth is 6.5°-7.5°.
The band saw blade according to claim 4, wherein the first non-separating, half-dividing left-dividing, half-dividing right-division and second non-separating-toothed teeth have the same height and are both high The height of the tip of the standard left and standard right teeth.
The band saw blade according to claim 1, wherein a sub-tooth sub-cycle in the main cycle is a set of seven teeth, and the order of the teeth is: no teeth, small teeth, left teeth, Small split tooth right split tooth, half split tooth amount left split tooth, half split tooth right split tooth, standard left split tooth and standard right split tooth, or no split tooth, small split tooth right split tooth, small split tooth amount left Split tooth, half split tooth right split tooth, half split tooth left split tooth, standard right split tooth and standard left split tooth; the standard left split and standard right split teeth have larger split teeth than half split teeth left split And the splitting amount of the semi-fractional right splitting tooth, the splitting amount of the semi-fractional left splitting and the half-dividing right splitting teeth are larger than the small splitting amount of the left splitting tooth and the small splitting toothing of the right splitting tooth Tooth amount; preferably, the standard left and right standard teeth have a torsion angle of 5.5°-6.5°, and the standard left and standard right teeth have a blade inclination of 6.5°-7.5°.
The band saw blade according to claim 6, wherein the non-separating tooth, the small-tooth-to-spinning left-splitting tooth, the small-splitting-tooth-to-right-splitting tooth, the half-splitting-to-saw left-splitting tooth, and the half-severing tooth-right-splitting tooth The tip height is the same and is higher than the tip height of the standard left and standard right teeth.
A method of manufacturing a band saw blade according to any one of claims 1 to 7, comprising the steps of:

a) machining the band saw blade into a geometric sub-circle sawtooth;

b) quenching and tempering the processed band saw blade;

c) the quenched and tempered band saw blade is used to grind the rake face of the sawtooth, and the rake saw blade front angle formed by the machining is 0°-20°;

d) grinding the serrated flank surface, that is, the top grinding, the rear corner of the sawtooth saw blade after grinding is 25°-35°;

e) The individual serrations are toothed in accordance with the rule of the serrations, i.e. forming the band saw blade of any of claims 1-7.
The method of manufacturing a band saw blade according to claim 8, wherein the band saw blade is a bimetal band saw blade.
The method of manufacturing a band saw blade according to claim 8, wherein the sawtooth of the band saw blade is processed by laser cutting or milling.