CN112059299B

CN112059299B - Split-tooth type band saw blade

Info

Publication number: CN112059299B
Application number: CN202010909973.2A
Authority: CN
Inventors: 余畅
Original assignee: Bichamp Cutting Technology Hunan Co Ltd
Current assignee: Hunan Taijia Intelligent Technology Co ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2021-11-16
Anticipated expiration: 2040-09-02
Also published as: WO2022048340A1; CN112059299A

Abstract

The invention discloses a separated tooth type band saw blade, wherein 7 saw teeth which are continuously distributed form a period; before tooth separation, the tops of the first saw tooth and the third saw tooth incline to the left, the tops of the second saw tooth and the fourth saw tooth incline to the right, and chamfers are arranged on two sides of the top of the fifth saw tooth; the first saw tooth, the second saw tooth, the third saw tooth and the fourth saw tooth are the same in height and are larger than the fifth saw tooth in height; after tooth division, tooth division is carried out on the third sawtooth and the sixth sawtooth to the right, tooth division is carried out on the fourth sawtooth and the seventh sawtooth to the left, and the tooth division amount of the third sawtooth is smaller than that of the sixth sawtooth; the middle flush part of the top of the fifth sawtooth is higher than the middle part of the first sawtooth and the middle part of the second sawtooth. The invention can further reduce the cutting force; through the setting to each profile, make full use of the compensation of the blade part of different tooth to improve the blade utilization degree of each tooth as far as possible, can strengthen whole wear resistance, prolong the life of tooth portion.

Description

Split-tooth type band saw blade

Technical Field

The invention relates to a split-tooth type band saw blade, and belongs to the technical field of saw cutting.

Background

From the development of hard alloy products, at present, two main types of hard alloy band saw blades of a tooth dividing type and a non-tooth dividing type are mainly provided. For most workpieces, the saw cutting is mainly performed by hard alloy saw blades of a tooth dividing type.

The tooth-dividing type hard alloy saw blade mainly comprises a three-chip standard type and a multi-chip type from the viewpoint of tooth shape design, wherein the multi-chip type also comprises a 7-chip type and an 11-chip type. From the cutting force perspective, the cutting force of the multi-chip type hard alloy in the sawing process is obviously lower than that of the three-chip standard type, the cutting force is smaller when the chips are more divided, and the production cost and the quality of the band saw blade are more difficult to control.

At present, the domestic sawing machines are greatly improved compared with the prior sawing machines, but the simple sawing machines belong to old equipment in general, and the simple sawing machines do not have back pressure, so that the hard alloy band saw blades are easy to vibrate greatly in the process of using the hard alloy band saw blades, and the sawing sound is sharp and harsh. Particularly, the three-chip standard type hard alloy band saw blade is adopted, and because the number of teeth in each group is the minimum, the natural frequency is very low, the phenomenon of resonance is easily generated, so that the vibration is large, and the premature failure of the saw blade is easily caused by the resonance.

For a multi-chip type cemented carbide saw blade, although the resonance problem and the cutting force problem are greatly improved, because each group of the saw blade has a large number of teeth, the utilization degree of the cutting edge of a single tooth in each group of the teeth is not high, namely, the cutting edge of each single tooth which actually plays a cutting role is short, and therefore, for a single tooth, the shorter the cutting edge which plays a cutting role is, the larger the stress of the stressed cutting edge is, the more easily the cutting edge is worn, and the situations of saw immobility, low efficiency and the like occur.

Therefore, the problem to be solved is how to increase the utilization rate of the single-tooth edge on the basis of reducing the cutting force, and the multi-chip type hard alloy band saw blade is formed.

Disclosure of Invention

The invention provides a split-tooth type band saw blade, which aims to solve the problems that when a workpiece is sawed, the inherent frequency is low and vibration and screaming are easy to generate due to the fact that the number of teeth of each group is small, and the problems that cutting is immovable, sawing efficiency is low and sawing inclination is easy to generate due to the fact that single teeth are abraded too much in the sawing process. The specific technical scheme is as follows.

A kind of tooth separating band saw blade, including the saw blade body and sawtooth located on saw blade body, characterized by, 7 sawtooth distributed continuously form a cycle, 7 teeth in a cycle are the first sawtooth, second sawtooth, third sawtooth, fourth sawtooth, fifth sawtooth, sixth sawtooth, seventh sawtooth respectively;

before tooth separation, the tops of the first saw tooth and the third saw tooth are inclined towards the left side, the tops of the second saw tooth and the fourth saw tooth are inclined towards the right side, chamfers are arranged on two sides of the top of the fifth saw tooth, and the tops of the sixth saw tooth and the seventh saw tooth are level; the first saw tooth, the second saw tooth, the third saw tooth and the fourth saw tooth are the same in height and are larger than the fifth saw tooth in height; the height of the sixth sawtooth is the same as that of the seventh sawtooth, and the height of the fifth sawtooth is greater than that of the sixth sawtooth;

after tooth division, the first sawtooth, the second sawtooth and the fifth sawtooth are not tooth-divided, the third sawtooth and the sixth sawtooth are tooth-divided to the right side, and the fourth sawtooth and the seventh sawtooth are tooth-divided to the left side, wherein the tooth division amount of the third sawtooth and the fourth sawtooth is the same, the tooth division amount of the sixth sawtooth and the seventh sawtooth is the same, and the tooth division amount of the third sawtooth is smaller than the tooth division amount of the sixth sawtooth; the fifth saw tooth top middle flush part is higher than the middle part of the first saw tooth and higher than the middle part of the second saw tooth when viewed along the extending direction of the saw blade body.

Further, the front angle of the saw teeth is 10-20 degrees, preferably 10 degrees; the tooth clearance angle is 10 to 30, preferably 20.

Furthermore, before tooth separation, the heights of the first saw tooth, the fifth saw tooth and the sixth saw tooth are distributed in an arithmetic progression. Preferably, the first saw tooth is 0.07mm higher than the fifth saw tooth, and the fifth saw tooth is 0.07mm higher than the sixth saw tooth.

Further, before tooth separation, the top of the first sawtooth and the top of the third sawtooth incline to the left at an angle theta, the top of the second sawtooth and the top of the fourth sawtooth incline to the right at an angle theta of 5-15 degrees; preferably, the angle θ is 7 °.

Further, the chamfer angle omega of the fifth sawtooth is 15-50 degrees; preferably 45.

According to the invention, a 7-tooth/group tooth form design is adopted, so that the cutting chips in the sawing process are slender and thin, and the cutting force can be further reduced; through the setting to each profile, make full use of the compensation of the blade part of different tooth to improve the blade utilization degree of each tooth as far as possible, can strengthen whole wear resistance, prolong the life of tooth portion.

Drawings

FIG. 1 is a front view of a band saw blade of the present invention;

FIG. 2 is a design view of the tooth profile of the band saw blade after tooth separation according to the present invention;

FIG. 3 is a schematic view of the tooth profile and tooth height of the band saw blade before tooth separation according to the present invention;

FIG. 4 is a cutting schematic view of the band saw blade of the present invention;

FIG. 5 is a schematic view of the tooth edges of the band saw blade of the present invention;

FIG. 6 is a schematic view of the saw blade of the present invention showing the cutting of the teeth;

fig. 7 is a diagram showing the relationship between the chip thickness and the cutting force.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Referring to fig. 1-6, a split-teeth band saw blade includes a saw blade body and teeth on the saw blade body, wherein 7 teeth continuously distributed form a cycle, and the 7 teeth in the cycle are a first tooth 1, a second tooth 2, a third tooth 3, a fourth tooth 4, a fifth tooth 5, a sixth tooth 6, and a seventh tooth 7;

as shown in fig. 3, before tooth separation, the tops of the first saw tooth 1 and the third saw tooth 3 incline to the left, the tops of the second saw tooth 2 and the fourth saw tooth 4 incline to the right, two sides of the top of the fifth saw tooth 5 are provided with chamfers, and the tops of the sixth saw tooth 6 and the seventh saw tooth 7 are flush; the first saw tooth 1, the second saw tooth 2, the third saw tooth 3 and the fourth saw tooth 4 have the same height, and the top of the first saw tooth 1, the second saw tooth 2, the third saw tooth 3 and the fourth saw tooth 4 are inclined, so that the height of the first saw tooth 1 is the highest height (the height of the tip), and the height of the fifth saw tooth 5 is greater than that of the first saw tooth; the heights of the sixth saw tooth 6 and the seventh saw tooth 7 are the same, and the height of the fifth saw tooth 5 is greater than that of the sixth saw tooth 6; preferably, the heights of the first saw tooth 1, the fifth saw tooth 5 and the sixth saw tooth 6 are distributed in an arithmetic progression. Preferably, the first saw tooth 1 is 0.07mm higher than the fifth saw tooth 5, and the fifth saw tooth 5 is 0.07mm higher than the sixth saw tooth 6; the top parts of the first saw tooth 1 and the third saw tooth 3 are inclined to the left at an angle theta, the top parts of the second saw tooth 2 and the fourth saw tooth 4 are inclined to the left at an angle theta, and the angle theta is different according to different sawing materials. The angle range of the theta is generally 0-15 degrees, in the embodiment, the hardness of the sawing material is not high, and the theta is 5-10 degrees, preferably 7 degrees; the 5# is a chamfer at two sides, the angle is omega, the omega is generally 15-50 degrees, in the embodiment, the angle is 30-50 degrees, and preferably 45 degrees because the sawing material is softer.

As shown in fig. 2, after tooth division (tooth division processing is performed after the sawteeth of the band saw blade are processed), the first sawteeth 1, the second sawteeth 2 and the fifth sawteeth 5 are not tooth divided, the third sawteeth 3 and the sixth sawteeth 6 are tooth divided to the right, the fourth sawteeth 4 and the seventh sawteeth 7 are tooth divided to the left, wherein the tooth dividing amounts of the third sawteeth 3 and the fourth sawteeth 4 are the same, the tooth dividing amounts of the sixth sawteeth 6 and the seventh sawteeth 7 are the same, and the tooth dividing amount of the third sawteeth 3 is less than the tooth dividing amount of the sixth sawteeth 6; the top middle flush part of the fifth tooth 5 is higher than the middle part of the first tooth 1 and higher than the middle part of the second tooth 2, seen in the extension direction of the saw blade body 8 (see fig. 2). The left and right sides are relative, which essentially means that the top of the first saw tooth 1 and the second saw tooth 2 are inclined in opposite directions; the third saw tooth 3 and the fourth saw tooth 4 have opposite tooth division directions.

The saw tooth rake angle α (see fig. 1) is mainly the plunge into the workpiece during cutting, and generally the larger the rake angle, the better the plunge; the size 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 sawteeth in the cutting process. The range of alpha is generally-5-20 degrees, in the embodiment, because the sawing workpiece is a relatively general material, the front angle alpha is 10-20 degrees, preferably 10 degrees;

the tooth clearance angle β (see fig. 1) is mainly vibration resistance and cutting force in the feed direction during cutting. Generally, the larger the back angle, the poorer the anti-vibration capability, and the smaller the cutting force applied to the feeding direction; in addition, the larger the clearance angle is, the smaller the friction between the rear cutter face and the workpiece is, the better the cutting fluid can enter into between the tooth point and the workpiece during sawing, the better heat dissipation effect is achieved, the temperature of the tooth point can be better reduced, and the abrasion of the tooth point cutting edge is slowed down. The range of the clearance angle β is generally 10 ° to 30 °, and in the present embodiment, since the cutting force in the feed direction is not large, the clearance angle β is 10 ° to 30 °, preferably 20 °;

the chips generated by the 1-7 # sawteeth are shown in FIG. 4. The thicknesses of the chips generated by the 1# and 2# teeth are the same, and the thicknesses of the chips generated by the 3# and 4# teeth are the same; the thicknesses of the chips generated by the No. 6 and No. 7 teeth are the same; the 5# tooth produced a thicker and narrower cut thickness.

The cutting edges of the tooth tips are shown in fig. 5-6. In the sawing process, 1# to 7# teeth sequentially enter a workpiece, the cutting edge of the 1# teeth is composed of L1 to L4, the cutting edge of the 2# teeth is composed of L5 to L8, and the cutting edge of the 5# teeth is L9. After 1#, 2# entered the work piece, because the 1# tooth saw cuts the part and has already covered L7, L8 of 2# tooth, the saw cuts the part and has already covered L3, L4 of 1# tooth in 2# tooth, so it is the cutting edge of L1, L2 and L5, L6 that it really plays the effect of sawing, and when L1, L2 and L5, L6 appear wearing and tearing too much, L7, L8 and L3, L4 will compensate it, thus reach the effect of lengthening the life-span of saw blade. Similarly, the edge portions L2, L3, L6 and L7 of the 1# and 2# teeth compensate for the excessive wear of the edge L9 of the 5# teeth. On one hand, the abrasion of the cutting edge (L10, L11) can be compensated, and on the other hand, the cutting force of the teeth 3#, 4#, 6#, and 7#, namely the left eccentric tooth and the right eccentric tooth, is reduced, so that a smoother sawing section is obtained.

According to the paper "Simulation of the intersection Cutting Action of a Bandsaw Blade" published by m.sarwar, h.hellbergh, a.r.dorasingam, m.persson et al, we can establish the relationship between the thickness of the chip and the Cutting force in the corresponding sawing process, as shown in fig. 7, where the square points represent the theoretical values of the Cutting force and the circular points represent the actual and corrected values.

According to the relation between the cutting force and the thickness of the cutting chips, the cutting force of the common tooth form of the hard alloy is calculated, and the cutting force of each tooth form is obtained, and is shown in the following table 1:

TABLE 1 comparison of chip forces and chip counts for different tooth rows

As can be seen from the above table, the cutting force of the tooth form design in this embodiment is the lowest, and from the perspective of the overall tooth form design, the cutting force of the present invention is reduced by 17.85% compared with the three-chip universal product, and the cutting force of the present invention is not obviously superior to that of Bacho 3881THQ series, but the production efficiency is high. In addition, 7 teeth/group in the invention patent, the middle teeth account for 3 teeth, account for 42.86% (Bacho THQ middle teeth account for 33.33%), are much higher than the series of the tooth division type, the abrasion resistance of the tooth part is enhanced, and the purpose of anti-skew cutting is achieved.

The embodiments of the present invention are described above with reference to the drawings, and the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A kind of tooth separating band saw blade, including the saw blade body and sawtooth located on saw blade body, characterized by, 7 sawtooth distributed continuously form a cycle, 7 teeth in a cycle are the first sawtooth, second sawtooth, third sawtooth, fourth sawtooth, fifth sawtooth, sixth sawtooth, seventh sawtooth respectively;

2. The divided tooth band saw blade according to claim 1, wherein a rake angle of said saw teeth is 10 ° -20 °.

3. The divided tooth band saw blade according to claim 1, wherein a saw tooth clearance angle is 10 ° -30 °.

4. The split-tooth band saw blade according to claim 3, wherein a saw tooth clearance angle is 20 °.

5. The split-tooth band saw blade according to claim 1, wherein the first saw tooth, the fifth saw tooth and the sixth saw tooth are arranged in an arithmetic progression in height before being split.

6. The split-tooth band saw blade according to claim 5, wherein said first tooth is 0.07mm higher than said fifth tooth, and said fifth tooth is 0.07mm higher than said sixth tooth.

7. The split-tooth band saw blade according to claim 1, wherein before the splitting, the top of the first saw tooth and the third saw tooth are inclined to the left at an angle θ, the top of the second saw tooth and the fourth saw tooth are inclined to the right at an angle θ, and the angle θ is 5 ° to 15 °.

8. The split-tooth band saw blade according to claim 7, wherein the angle θ is 7 °.

9. The split-tooth band saw blade according to claim 1, wherein the chamfer angle ω of said fifth tooth is 15 ° -50 °.

10. The split-tooth band saw blade according to claim 9, wherein the chamfer angle ω of the fifth tooth is 45 °.