CN117161476A

CN117161476A - Non-tooth band saw blade

Info

Publication number: CN117161476A
Application number: CN202311300694.6A
Authority: CN
Inventors: 余畅
Original assignee: Hunan Taijia Intelligent Technology Co ltd
Current assignee: Hunan Taijia Intelligent Technology Co ltd
Priority date: 2023-10-09
Filing date: 2023-10-09
Publication date: 2023-12-05

Abstract

The application discloses a non-tooth band saw blade, comprising: the saw blade comprises a saw blade body and saw teeth positioned on the saw blade body; wherein a plurality of adjacent sawteeth which are sequentially arranged form a tooth arrangement period, and both sides of each sawtooth are provided with chamfers; each tooth arrangement period comprises a symmetrical sawtooth group and an asymmetrical sawtooth group, wherein the asymmetrical sawtooth group comprises a first asymmetrical tooth and a second asymmetrical tooth, and the transverse cutting forces of the first asymmetrical tooth and the second asymmetrical tooth are equal and opposite. Compared with the prior art, the non-tooth band saw blade provided by the application can reduce the vibration of the saw blade in the sawing process and simultaneously improve the surface roughness of workpiece sawing.

Description

Non-tooth band saw blade

Technical Field

The application relates to the technical field of sawing metal cutters, in particular to a non-tooth band saw blade.

Background

The application scale of aluminum alloy materials is rapidly increased, so that the cutting processing requirements of aluminum materials are increasingly large. Compared with steel, the aluminum alloy material has high strength, low melting point (659 ℃) and high finish requirements of a processing surface, and has high linear speed required by sawing aluminum materials and high requirements on processing cutters. From the development of hard alloy products, two main types of tooth-separated type and non-tooth-separated type hard alloy band saw blades exist at present. The hard alloy saw blade without tooth separation is mainly applied to high-speed sawing of nonferrous metals such as aluminum alloy, copper alloy and the like, and has the advantages of high sawing speed, high sawing efficiency, good quality of cut surfaces and the like.

Generally, when sawing with a carbide band saw blade, the sawing speed is required to exceed 600m/min. When the bi-metal band saw blade is adopted for sawing, the sawing speed is not lower than 300m/min generally, but when the bi-metal band saw blade is used for sawing on a special vertical high-speed sawing machine, the linear speed is even higher than 2500m/min and is more than 30 times of the processing efficiency of a common carbon steel saw blade. Aluminum can form aluminum oxide after being heated in air, and the aluminum oxide has great grinding capability on hard alloy or high-speed steel tooth tips.

The current saw blade mainly has the following problems in high-speed cutting of aluminum: on one hand, the vibration is large in the sawing process of the existing saw blade, on the other hand, the surface of a workpiece after sawing of the existing saw blade is rough, and the saw cutting knife lines are deeper.

Accordingly, there is a need for a non-tooth band saw blade that improves the surface roughness of a workpiece saw while reducing vibration of the blade during the sawing process.

Disclosure of Invention

In order to solve the technical problems of large vibration and poor quality of a machined surface when a workpiece (particularly an aluminum alloy) is cut at a high speed, the application provides a non-tooth-separation band saw blade, which can reduce the vibration of the saw blade in the sawing process and improve the surface roughness of sawing of the workpiece.

The technical scheme provided by the application is as follows:

a non-tooth band saw blade comprising: the saw blade comprises a saw blade body and saw teeth positioned on the saw blade body;

wherein,

a plurality of adjacent sawteeth which are sequentially arranged form a tooth arrangement period, and both sides of each sawtooth are provided with chamfers; each tooth arrangement period comprises a symmetrical sawtooth group and an asymmetrical sawtooth group, wherein the asymmetrical sawtooth group comprises a first asymmetrical tooth and a second asymmetrical tooth, and the transverse cutting forces of the first asymmetrical tooth and the second asymmetrical tooth are equal and opposite.

Preferably, the first asymmetric tooth is equal in height to the second asymmetric tooth.

Preferably, at least two asymmetric sawtooth groups are provided, and the two asymmetric sawtooth groups have a height difference.

Preferably, ten adjacent and sequentially arranged sawteeth form one tooth arrangement period, in one tooth arrangement period, the grinding teeth of the first, second, fourth, eighth, sixth and tenth sawteeth are of symmetrical structures, and the third, fifth, seventh and ninth sawteeth are of asymmetrical structures.

Preferably, the heights of the first, ninth, fifth, tenth and eighth serrations decrease in sequence, and the heights of the ninth and seventh serrations are the same, the heights of the fifth and third serrations are the same, the tenth and sixth serrations are the same, and the heights of the eighth, second and fourth serrations are the same.

Preferably, the chamfer angle of each serration is the same.

Preferably, a front angle formed between a front side surface of each of the serrations and a vertical direction is 10 ° to 20 °, and a rear angle formed between a rear side surface of each of the serrations and a cutting feed direction is 10 ° to 30 °.

Preferably, a front angle formed between a front side surface of each of the serrations and a vertical direction is 10 °, and a rear angle formed between a rear side surface of each of the serrations and a cutting feed direction is 20 °.

Preferably, the radial and tangential angles of each of said serrations are 8 °.

Preferably, the serrations comprise cutting edges formed from cemented carbide.

The non-tooth-dividing band saw blade comprises a saw blade body and saw teeth, wherein a plurality of saw teeth which are adjacently and sequentially arranged form a tooth arrangement period, and in the process of sawing a workpiece, the band saw blade has high linear speed and large cutting amount of tooth tips, so that the shake of the saw blade body in the sawing process is easily caused, the cutting quality and the service life of the saw blade are affected, and in order to solve the problem, chamfer angles are arranged on two side surfaces of each saw tooth, so that the risk of tipping caused by concentrated stress of the tooth tips can be reduced, the cutting amount of the tooth tips during cutting can be reduced, and the cutting resistance and the feeding resistance can be reduced; and secondly, each tooth arrangement period comprises a symmetrical sawtooth group and an asymmetrical sawtooth group, the asymmetrical sawtooth group comprises a first asymmetrical tooth and a second asymmetrical tooth, the transverse cutting forces of the first asymmetrical tooth and the second asymmetrical tooth are equal and opposite, the cutting forces on the cutting edges of the first asymmetrical tooth and the second asymmetrical tooth in the asymmetrical sawtooth group can be decomposed into transverse cutting component force and longitudinal cutting component force, the transverse cutting component force of the first asymmetrical tooth and the transverse cutting component force of the second asymmetrical tooth can be mutually offset, the transverse vibration of the band saw blade in the high-speed cutting process can be well restrained, the risks of tipping, tooth beating and tooth pulling of tooth tips are reduced, and the sawing surface quality is further improved. Therefore, compared with the prior art, the non-tooth-division band saw blade in the embodiment of the application can reduce vibration of the saw blade in the sawing process and improve the surface roughness of workpiece sawing.

Drawings

In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a tooth pattern diagram of a non-split band saw blade according to an embodiment of the present application;

FIG. 2 is a schematic view of a first asymmetric tooth cutting provided in an embodiment of the present application;

FIG. 3 is a schematic cutting view of a second asymmetric tooth structure according to an embodiment of the present application;

FIG. 4 is a schematic illustration of a cutting tip of a non-split band saw blade according to an embodiment of the present application;

FIG. 5 is a tooth profile height view of a non-split band saw blade according to an embodiment of the present application;

FIG. 6 is a schematic view of radial and tangential angles of serrations provided by an embodiment of the present application;

FIG. 7 is a view showing a front elevation view of ten teeth in a tooth arrangement cycle (as viewed along the length of a band saw blade) in accordance with one embodiment of the present application.

Detailed Description

In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions of the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or be indirectly 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 be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" or "a number" means two or more, unless specifically defined otherwise.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the application to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the application, are included in the spirit and scope of the application which is otherwise, without departing from the spirit or scope thereof.

The embodiment of the application is written in a progressive manner.

As shown in fig. 1 to 7, an embodiment of the present application provides a non-divided band saw blade including: the saw blade comprises a saw blade body and saw teeth positioned on the saw blade body; wherein, a plurality of adjacent sawteeth which are sequentially arranged form a tooth arrangement period, and both sides of each sawtooth are provided with chamfers; each tooth arrangement period comprises a symmetrical sawtooth group and an asymmetrical sawtooth group, wherein the asymmetrical sawtooth group comprises a first asymmetrical tooth and a second asymmetrical tooth, and the transverse cutting forces of the first asymmetrical tooth and the second asymmetrical tooth are equal and opposite.

The band saw blade in the prior art mainly has the problems of large vibration and rough surface of a workpiece after sawing by a saw blade and deeper knife lines in high-speed cutting.

In order to solve the technical problem, the non-tooth-dividing band saw blade comprises a saw blade body and saw teeth, wherein a plurality of saw teeth which are adjacently and sequentially arranged form a tooth arrangement period, and in the process of sawing a workpiece, the band saw blade has high linear speed and large cutting quantity of tooth tips, so that the shake of the saw blade body in the sawing process is easily caused, the cutting quality and the service life of the saw blade are affected, and in order to solve the problem, chamfer angles are arranged on two side surfaces of each saw tooth, so that on one hand, the risk of tipping caused by stress concentration of the tooth tips can be reduced, on the other hand, the cutting quantity of the tooth tips during cutting can be reduced, and the cutting resistance and the feeding resistance can be reduced; and secondly, each tooth arrangement period comprises a symmetrical sawtooth group and an asymmetrical sawtooth group, the asymmetrical sawtooth group comprises a first asymmetrical tooth and a second asymmetrical tooth, the transverse cutting forces of the first asymmetrical tooth and the second asymmetrical tooth are equal and opposite, the cutting forces on the cutting edges of the first asymmetrical tooth and the second asymmetrical tooth in the asymmetrical sawtooth group can be decomposed into transverse cutting component force and longitudinal cutting component force, the transverse cutting component force of the first asymmetrical tooth and the transverse cutting component force of the second asymmetrical tooth can be mutually offset, the transverse vibration of the band saw blade in the high-speed cutting process can be well restrained, the risks of tipping, tooth beating and tooth pulling of tooth tips are reduced, and the sawing surface quality is further improved. Therefore, compared with the prior art, the non-tooth-division band saw blade in the embodiment of the application can reduce vibration of the saw blade in the sawing process and improve the surface roughness of workpiece sawing.

Specifically, as shown in fig. 2 and 3, fig. 2 and 3 are schematic diagrams showing the shape of two saw teeth combined by a group of asymmetric saw teeth, the saw teeth are in a hexagonal structure seen along the length direction of the band saw blade, two sides of the symmetric saw teeth are symmetric about the center line (the center plane along the length direction of the band saw blade), while the saw teeth in the asymmetric saw teeth group are in an asymmetric structure about the center line, the distance from the cutting surface participating in cutting to the center line is larger than the distance from the surface not participating in cutting to the center line for a single saw tooth, as shown in fig. 2, the first surface (L1) of the first asymmetric tooth (exemplified by the 9# tooth) participates in cutting, the second surface (L2) does not participate in cutting, the cutting force on the first surface is decomposed along the direction perpendicular to the center line and the direction parallel to the center line, as shown in fig. 3, the first surface (L3) of the second asymmetric tooth (for example, the 7# tooth) does not participate in cutting, the second surface (L4) participates in cutting, and the cutting component of the second surface of the second asymmetric tooth is decomposed to obtain a second transverse force and a second longitudinal force, wherein the first transverse force is equal to the second transverse force, and the directions are opposite, so that transverse vibration of the band saw blade in the high-speed cutting process can be well inhibited, the risks of chipping, tooth breaking and tooth pulling of the tooth tip are reduced, and the quality of the sawing surface is further improved.

In the above structure, as one implementation manner, the first asymmetric teeth and the second asymmetric teeth in the asymmetric teeth group in the embodiment of the present application are equal in height. The arrangement is such that the cutting force of the first asymmetric tooth is equal to the cutting force of the second asymmetric tooth, and the decomposed first and second lateral forces can cancel out to inhibit lateral vibration of the band saw blade during high-speed cutting.

In the above structure, as one implementation manner, at least two asymmetric saw tooth groups are provided in the embodiment of the present application, and a height difference is provided between the two asymmetric saw tooth groups, so that a position of each saw tooth for cutting a workpiece in a cutting process has a definite division of labor, and the purpose is to reduce a cutting force of a single saw tooth in the cutting process.

In the above structure, as one implementation manner, the symmetrical sawtooth group in the embodiment of the present application includes at least one symmetrical sawtooth.

In the above configuration, it is to be noted that "a plurality of teeth are adjacently and sequentially arranged to form one tooth arrangement period", and "a plurality of teeth" herein means three or more natural numbers. As a specific implementation manner, ten adjacent and sequentially arranged sawteeth in the embodiment of the present application form a tooth arrangement period, in one tooth arrangement period, the grinding teeth of the first, second, fourth, eighth, sixth and tenth sawteeth are specifically symmetrical structures, and the third, fifth, seventh and ninth sawteeth are specifically asymmetrical structures.

The prior art hard alloy saw blade without tooth separation mainly has three-chip standard type and multi-chip type from the tooth type design, wherein the multi-chip type has 7 chip types and 11 chip types. From the cutting force point of view, the cutting force of the multi-chip hard alloy is obviously lower than that of a three-chip standard type hard alloy in the sawing process, and the more chips are separated, the smaller the cutting force is.

Firstly, as shown in fig. 1, ten saw teeth are arranged in one tooth arrangement period of the non-tooth-dividing band saw blade provided by the application, as shown in fig. 4, the generated cutting chips are 15 chips per group, and the tooth design of 10 teeth/group is more slender and thinner than that of the conventional multi-chip band saw blade, and the cutting chips in the sawing process of the non-tooth-dividing band saw blade provided by the embodiment of the application can further reduce the cutting force. Secondly, in a tooth arrangement period, the grinding teeth of the first, second, fourth, eighth, sixth and tenth saw teeth are of symmetrical structures, the third, fifth, seventh and ninth saw teeth are of asymmetrical structures, vibration of the band saw blade in the sawing process can be reduced through the tooth type of the symmetrical structure and the tooth type of the asymmetrical structure, sawing surface quality is improved, and the anti-cutting-oblique capability of the saw blade in the running process is improved through the tooth type of the symmetrical structure, so that the service life of the band saw blade in the sawing process is guaranteed.

In the above-described structure, as a more preferable embodiment, as shown in fig. 5 and 7, the heights of the first, ninth, fifth, tenth and eighth serrations in the embodiment of the present application are sequentially reduced, the heights of the ninth and seventh serrations are the same, the heights of the fifth and third serrations are the same, the heights of the tenth and sixth serrations are the same, and the heights of the eighth, second and fourth serrations are the same. The application reduces the risk of cutting and tilting by setting the height difference of a plurality of grades.

In the above-described structure, as one of the embodiments, the chamfer of each serration in the embodiment of the present application is the same.

Specifically, a band saw blade with ten saw teeth in one tooth arrangement period is specifically described, as shown in fig. 4, the tooth 1 is a cutting tooth, and is also the highest tooth, and the two sides of the tooth 1 are chamfered, so that the cutting resistance and the feeding resistance during cutting are reduced, the formed chip is number 1, and the chip is thicker and takes a shape of a wire;

the teeth 2# and 4# are the lowest teeth, and the main function of the teeth is to form kerfs, namely the widths of the teeth 2# and 4# and 8# determine the widths of the kerfs during cutting, and the corresponding chips formed by the teeth 2# and 4# and 8# are 2, 3, 5, 6, 12 and 13 # 6 chips, and the chips are in a flake shape;

the teeth 3# and 5# and the teeth 7# and 9# are asymmetric teeth, and the asymmetric teeth refer to the shape of single teeth of the asymmetric teeth which are not completely left and right symmetric. Taking 7# teeth and 9# teeth as examples, in the sawing process, the side face cutting edge of the 9# teeth participating in cutting is L1, the cutting edge L2 of the other side face does not participate in cutting, at the moment, the cutting force of the L1 cutting edge can be decomposed into two transverse and longitudinal cutting component forces, and as the 9# teeth and the 7# teeth are mutually in a group, the 7# tooth side face cutting edge L4 can also be decomposed into two transverse and longitudinal cutting component forces, and the cutting forces of the 7# teeth and the 9# teeth in the transverse direction can be mutually offset, so that transverse vibration of the band saw blade in the high-speed cutting process can be well restrained, the risks of tipping, tooth beating and tooth pulling of the tooth tip can be reduced, and the sawing surface quality can be further improved;

the cuttings formed by the No. 6 teeth and the No. 10 teeth are 8, 9, 14 and 15 cuttings, and the cutting edges participating in cutting are relatively narrow, and the equal height gradient is relatively small, so that the cuttings are relatively narrow and thin. The 6# and 10# teeth are added on one hand to better reduce cutting force, and on the other hand share the cutting load of the 2# teeth, the 4# teeth and the 8# teeth, so as to better obtain cutting surface quality.

Further, the tooth form of the symmetrical structure and the tooth form of the asymmetrical structure in the embodiment of the present application are symmetrical about a center with respect to the tooth form of a single sawtooth, and as one implementation manner, the first asymmetrical tooth and the second asymmetrical tooth in the asymmetrical sawtooth group in the embodiment of the present application are symmetrically distributed in one tooth arrangement period.

For the band saw blade with ten saw teeth in one tooth arrangement period provided in the present technical solution, as shown in fig. 1, the 1# tooth is a cutting tooth, and is also the highest tooth, i.e. the first height tooth, the 7# tooth and the 9# tooth are asymmetric teeth, the 7# tooth and the 9# tooth are respectively arranged at two sides of the 1# tooth, the 7# tooth and the 9# tooth are second height teeth, the 3# tooth and the 5# tooth are asymmetric teeth, the 3# tooth and the 5# tooth are symmetrically arranged at two sides of the 1# tooth, the 3# tooth and the 5# tooth are second height teeth, the 6# tooth and the 10# tooth are third height teeth, the 2# tooth, the 4# tooth and the 8# tooth are fourth height teeth, wherein the first height is greater than the second height and the third height is greater than the fourth height.

As shown in fig. 5, a rake angle is formed between the front side surface of the saw tooth and the vertical direction, a relief angle is formed between the rear side surface of the saw tooth and the cutting feed direction, the rake angle is denoted by α, the relief angle is denoted by β, and the saw tooth rake angle α is mainly the cutting performance on the workpiece during the cutting process, and generally, the larger the rake angle is, the better the cutting performance is; the magnitude of the rake angle can improve the cutting force, and the larger the rake angle is, the smaller the cutting force is applied to the saw teeth in the cutting process. Alpha is typically in the range of-5 deg. to 20 deg., and in this embodiment, the rake angle alpha is 10 deg. to 20 deg..

The serration relief angle beta is mainly resistant to vibration and cutting forces in the feed direction during cutting. Generally, the larger the relief angle beta is, the poorer the vibration resistance is, and the smaller the cutting force is applied to the feeding direction; in addition, the larger the relief angle beta is, the smaller the friction between the rear cutter face and the workpiece is, and the cutting fluid can better enter between the tooth tip and the workpiece during sawing, so that the heat dissipation effect is better, the temperature of the tooth tip can be better reduced, and the abrasion of the cutting edge of the tooth tip is slowed down. The relief angle β typically ranges from 10 ° to 30 °, in this embodiment, from 10 ° to 30 °.

Still further, in the embodiment of the present application, the front angle α is preferably 10 °, and the rear angle β is preferably 20 °.

As shown in fig. 6, fig. 6 is a schematic view of radial angles and tangential angles of the saw teeth, wherein the radial angles are denoted by θ, and the tangential angles are denoted by γ. When the tooth tip side edge contacts with a workpiece for cutting, the contact area between the tooth tip side edge and the workpiece can be reduced by the large radial angle theta and the tangential angle gamma, and the original surface contact is changed into point contact, so that the abrasion of the tooth tip side edge is very small, the tension of the tooth tip edge can be maintained, and the cutting-skew phenomenon in the cutting process is prevented. The design angle of the radial angle theta and the tangential angle gamma in the prior art is 1-6 degrees, and the radial angle theta and the tangential angle gamma in the non-tooth-dividing band saw blade provided by the embodiment of the application are 8 degrees. Compared with the prior art, the radial angle theta and the tangential angle gamma are larger, and through the design of the large radial angle theta and the tangential angle gamma, the abrasion of the cutting edge of the tooth tip can be obviously reduced, the service life of the band saw blade is prolonged, and the cutting-slope risk of a workpiece is reduced.

In the above-described structure, as one specific embodiment, the serrations in the embodiment of the present application include a cutting edge formed of cemented carbide. The hard alloy material has high hardness, strength, wear resistance and corrosion resistance, and has longer service life.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A non-tooth band saw blade comprising: the saw blade comprises a saw blade body and saw teeth positioned on the saw blade body;

wherein,

2. The undivided band saw blade of claim 1, wherein,

the first asymmetric tooth is equal in height to the second asymmetric tooth.

3. The undivided band saw blade of claim 2, wherein,

the asymmetric sawtooth groups are at least provided with two groups, and the two asymmetric sawtooth groups have height differences.

4. A non-serrated band saw blade as claimed in any one of claims 1 to 3, wherein,

ten adjacent and orderly arranged sawteeth form a tooth arrangement period, grinding teeth of the first, second, fourth, eighth, sixth and tenth sawteeth are of symmetrical structures, and the third, fifth, seventh and ninth sawteeth are of asymmetrical structures.

5. A non-split band saw blade according to claim 4, wherein,

the heights of the first, ninth, fifth, tenth and eighth saw teeth are sequentially reduced, the heights of the ninth and seventh saw teeth are the same, the heights of the fifth and third saw teeth are the same, the heights of the tenth and sixth saw teeth are the same, and the heights of the eighth, second and fourth saw teeth are the same.

6. The undivided band saw blade of any one of claims 1, 2, 3, and 5,

the chamfer angle of each serration is the same.

7. The undivided band saw blade of any one of claims 1, 2, 3, and 5,

the front angle formed between the front side surface of each saw tooth and the vertical direction is 10-20 degrees, and the rear angle formed between the rear side surface of each saw tooth and the cutting feed direction is 10-30 degrees.

8. The undivided band saw blade of claim 7, wherein,

the front angle formed between the front side surface of each saw tooth and the vertical direction is 10 degrees, and the rear angle formed between the rear side surface of each saw tooth and the cutting feed direction is 20 degrees.

9. The undivided band saw blade of any one of claims 1, 2, 3, 5, 8,

the radial and tangential angles of each of the serrations are 8 °.

10. The undivided band saw blade of any one of claims 1, 2, 3, 5, 8,

the serrations include a cutting edge formed from cemented carbide.