CN111299701A

CN111299701A - Band saw blade

Info

Publication number: CN111299701A
Application number: CN202010233959.5A
Authority: CN
Inventors: 刘国跃; 贾寓真; 柳寒潇; 易佳文
Original assignee: Bichamp Cutting Technology Hunan Co Ltd
Current assignee: Bichamp Cutting Technology Hunan Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-06-19

Abstract

The utility model provides a band saw blade, includes the saw blade body, it has a plurality of sawtooth group to arrange on the saw blade body, every sawtooth group includes a plurality of sawtooth, the sawtooth that every sawtooth group corresponds has the same shape and arranges the order, the sequencing in the same sawtooth group is that the height of sawtooth to saw blade body back of the body of odd number all is greater than the height of sawtooth to saw blade body back of the body of the even number of sequencing, perhaps the sequencing in the same sawtooth group is that the height of sawtooth to saw blade body back of the body of the even number all is greater than the height of sawtooth to saw blade body back of the body of the odd number of sequencing. According to the invention, two groups of sawteeth with different heights are arranged, so that the higher sawteeth can play a main cutting role during cutting, and when the thick-wall part of the section steel is cut, compared with the conventional tooth form, the number of the sawteeth which actually participate in cutting can be reduced, the cutting force is reduced, and the probability of tipping and beveling is reduced; when the thin-walled part of the section steel is cut, the number of actual sawteeth participating in cutting can be increased compared with the conventional tooth form, and the situation of no-sawteeth cutting is avoided.

Description

Band saw blade

Technical Field

The invention belongs to the field of saw cutting metal cutters, and particularly relates to a band saw blade.

Background

When the band saw blade is used for cutting a bundle, a plurality of layers of overlapped pipes, profiles and the like, for a single sawtooth, after entering a workpiece, the times of cutting in and cutting out materials are greatly increased relative to the times of cutting in and cutting out solid materials, such as square pipes with the wall thickness of 50mm multiplied by 50mm being 5mm, the two layers are overlapped, and each layer has 5 (10 in total) pieces, compared with the solid workpiece with the same size of 250mm multiplied by 100 mm. In cutting 250mm x 100mm solid material, the chips are generally continuous with the material cut or uncut only once after the individual teeth enter the workpiece. However, when a square tube of 50mm × 50mm in the same cross-sectional dimension is cut, the number of times of cutting into and out reaches 20 (4 times for a single square tube) because the workpiece is hollow after a single saw tooth enters the workpiece, and the number of times of impact on the cutting edge is greatly increased, so that the saw tooth is liable to be chipped.

In order to reduce the chipping of the saw teeth, a method of reducing the clearance angle and enhancing the structural strength is generally adopted in the design of the band saw blade. The method can achieve quite obvious improvement effect when being used on small-size workpieces. However, for large-sized steel sections, particularly steel sections having a more varied cross-sectional shape, the above method may result in beveling. The reason is that: the reduced relief angle increases the blade feed resistance, which is an important component that causes the band saw blade base band to experience bending moments. As the size of the workpiece increases, this increase in resistance causes the bending moment to increase even more, resulting in a tendency for beveling to occur.

Secondly, in the cutting process of the large-size bundled and multi-layer stacked sectional materials, a single-end clamping mode (general rear-end clamping) is generally adopted, and after a single sectional material in the bundled and multi-layer stacked sectional materials is cut off, due to the tolerance of the sectional material, clamping precision and the like, the unclamped end is often displaced, and the saw path is narrowed due to the displacement, so that the saw blade is clamped in the material. To avoid this phenomenon, the method of increasing the tooth separation amount is generally adopted to increase the width of the saw kerf to avoid the belt jamming. However, increasing the amount of teeth separation increases the amount of material to be cut, increases the cutting load, and decreases the cutting efficiency.

In addition, in the cutting process of large-sized profiles such as H-shaped steel, angle steel, and the like, the effective cutting length varies greatly in the cutting process, which also causes the number of teeth participating in cutting at the same time to vary greatly. At this time, if the saw blade with smaller pitch (the number of the saw teeth in the unit length is large) is selected, when the effective cutting size is long, the saw teeth are pulled due to the fact that the number of the saw teeth is too large, the cutting resistance is too large, the feeding is difficult easily, and the vibration of the saw blade is aggravated. And because effective cutting is long, the smear metal volume of production is too much, and little tooth is apart from the saw blade slot and does not have enough space to hold the smear metal and lead to the slot to be extruded by the smear metal, and then the baseband takes place the deformation, and the sawtooth is lifted up and jumps out the cutting, but because the saw blade baseband itself has good rigidity, does not have the condition when cutting force, and the sawtooth is pulled back original cutting position again. The process can also lead to the aggravation of the vibration of the saw blade, the temperature rise of the saw teeth, and the easy occurrence of belt clamping and tooth breakage. However, if a saw blade with a large tooth pitch is selected, the situation of cutting without sawteeth exists at a position with a small effective cutting length, and at the moment, if subsequent sawteeth enter into cutting, the subsequent sawteeth are impacted greatly, so that tooth breakage is easily caused.

Disclosure of Invention

The invention aims to provide a band saw blade, which solves the problems that the band saw blade is easy to have tipping, beveling or non-sawtooth cutting when cutting large-size sectional materials such as bundles, laminates and the like.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a band saw blade, includes the saw blade body, it has a plurality of sawtooth group to arrange on the saw blade body, every sawtooth group includes a plurality of sawtooth, the sawtooth that every sawtooth group corresponds has the same shape and arranges the order, a serial communication port, the sequencing in the same sawtooth group is that the height of sawtooth to saw blade body back side of odd number all is greater than the height of sawtooth to saw blade body back side of even number of sequencing, or the sequencing in the same sawtooth group is that the height of sawtooth to saw blade body back side of even number all is greater than the height of sawtooth to saw blade body back side of sequencing for the odd number of sequencing.

In the scheme, two groups of sawteeth which are alternately distributed in height are arranged, so that the higher sawteeth can play a main cutting role during cutting, and the number of the sawteeth which actually participate in cutting is reduced compared with the conventional tooth profile when the thick-wall part of the section steel is cut, so that the cutting force is effectively reduced, and the probability of tipping and beveling is reduced; meanwhile, when the thin-wall part of the section steel is cut, the number of actual sawteeth participating in cutting is increased compared with the conventional tooth shape, so that the situation of no-sawteeth cutting is avoided.

Preferably, in order to avoid the overlapping of two adjacent sawteeth with different heights and increase the cutting force, and in order to ensure that the shorter sawteeth can bear certain impact force and have cutting capability, the height difference of every two adjacent sawteeth is set to be 0.3-0.5 mm.

Preferably, the sawtooth group is including the first sawtooth, second sawtooth, third sawtooth, fourth sawtooth and the fifth sawtooth that arrange in proper order, and wherein first sawtooth, third sawtooth and fifth sawtooth all are greater than the height of second sawtooth, fourth sawtooth to saw blade body back side to the height of saw blade body back side.

Preferably, the tooth division amounts corresponding to the first saw tooth, the second saw tooth, the third saw tooth, the fourth saw tooth and the fifth saw tooth are respectively 0, S1, S2, S1 and S2, wherein S1 is more than or equal to S2 and more than 0.

In the above scheme, because first sawtooth, third sawtooth and fifth sawtooth undertake main cutting action, second sawtooth, fourth sawtooth are as supplementary tooth and through the contact of the side angle of deviating from and the kerf lateral wall after the cutting, form and support between kerf and the saw blade, the condition of no sawtooth cutting when reducible cutting steel member thin wall to reduce the saw blade vibrations.

Preferably, in order to ensure that the second saw tooth and the fourth saw tooth can play a supporting role and the wear of the eccentric tooth is generally about 0.2mm, the relation between the tooth dividing amount S1 of the second saw tooth or the fourth saw tooth and the tooth dividing amount S2 of the third saw tooth or the fifth saw tooth is set as follows: s2+0.2mm > S1 > S2.

Preferably, the tooth pitch between two adjacent teeth of the first, second, third, fourth and fifth teeth is L1, L2, L3, L4 and L5 in sequence, wherein L1 ≈ L3 ≈ L5 > L2 ≈ L4; the tooth depths corresponding to the first sawtooth, the second sawtooth, the third sawtooth, the fourth sawtooth and the fifth sawtooth are d1, d2, d3, d4 and d5 respectively, wherein d1 ≈ d3 ≈ d5 > d2 ≈ d 4.

In the scheme, the first saw teeth, the third saw teeth and the fifth saw teeth play a main cutting role, only a small number of cutting edges of the second saw teeth and the fourth saw teeth participate in cutting, and in order to deal with the situation that the chip containing space is insufficient when the steel member is cut at the thick-wall position, the first saw teeth, the third saw teeth and the fifth saw teeth have deeper tooth grooves and tooth spaces relative to the second saw teeth and the fourth saw teeth, so that a better chip containing space is obtained.

Preferably, the relationship between the tooth depths d1, d2, d3, d4 and d5 is: d1 ≈ d3 ≈ d5 > 1.5d2 ≈ 1.5d 4; the relationship between the pitches L1, L2, L3, L4 and L5 is: l1 ≈ L3 ≈ L5 > 1.5L2 ≈ 1.5L 4.

Compared with the prior art, the invention has the beneficial effects that: the problem of tipping and beveling of the sawteeth when cutting large-size sectional materials such as bundles, laminations and the like can be solved, and the cutting efficiency is improved; the sawteeth which undertake the main cutting have deeper tooth grooves and better chip containing space; the auxiliary teeth form the support between the saw slot and the saw blade, and the sawtooth-free cutting condition when the steel member is cut into a thin wall is reduced, so that the vibration of the saw blade is reduced, and the probability of belt clamping and tooth breakage is reduced.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a schematic illustration of the amount of teeth separated for the teeth of FIG. 1;

FIG. 3(a) is a schematic view of a tooth division projection of the corresponding tooth of FIG. 2;

FIG. 3(b) is a rear view of the corresponding serration of FIG. 2;

FIG. 4 is a comparison view of the present invention with a conventional tooth-shaped cut H-section steel thin-walled portion;

FIG. 5 is a comparison of the present invention with a conventional tooth-shaped cut H-section steel web portion.

Detailed Description

The invention is further illustrated by the following figures and examples.

As shown in fig. 1, a band saw blade includes a blade body 10 and first, second, third, fourth and

fifth teeth

1, 2, 3, 4 and 5 on the blade body 10. Wherein the first sawtooth 1 is a straight tooth, the second sawtooth 2 and the fourth sawtooth 4 are short-offset teeth, and the third sawtooth 3 and the fifth sawtooth 5 are high-offset teeth. The depth and the interval of the tooth grooves corresponding to the first sawteeth 1, the second sawteeth 2, the third sawteeth 3, the fourth sawteeth 4 and the fifth sawteeth 5 are respectively as follows: d1, d2, d3, d4, d5, L1, L2, L3, L4 and L5. dp is the height difference of the first saw tooth 1, the third saw tooth 3 and the fifth saw tooth 5 with respect to the second saw tooth 2 or the fourth saw tooth 4.

As shown in fig. 2 and 3, the tooth separation amount of the second saw tooth 2 and the fourth saw tooth 4 is S1, the tooth separation amount of the third saw tooth 3 and the fifth saw tooth 5 is S2, and Hf is the height from the bending start position to the tooth tip corresponding to the tooth separation amount of S1.

In order to avoid the high-offset teeth and the high-offset teeth from being separately processed to generate overlapping, thereby increasing the cutting force, dp must be larger than the wear amount of the tooth tip of the bimetallic band saw blade, which is failed. In a general working condition, the tooth tip height lost by the abrasion failure of the sawteeth of the band saw blade is 0.3-0.5 mm, so that the height difference dp between a high tooth and a low tooth is more than or equal to 0.3mm in practical implementation. At this time, before the band saw blade fails, the cutting edges of the middle portions of the second saw teeth 2 and the fourth saw teeth 4 do not participate in cutting, the cutting amounts of the first saw teeth 1, the third saw teeth 3, and the fifth saw teeth 5 are not affected, and the cutting force is not affected. In actual use, however, the short teeth with large tooth division amount still have very small parts of saw teeth to participate in cutting, in order to ensure that the parts of saw teeth can bear certain impact force and have cutting capability, a certain high-speed steel tooth tip and the length of a welding seam between high-speed steel and a base band need to be kept, and the height of the high-speed steel raw material of the bimetal saw blade is comprehensively considered to be 1.0-2.0 mm, so that the height difference dp between the high teeth and the short teeth is less than or equal to 0.5 mm.

According to the invention, the first saw teeth 1, the third saw teeth 3 and the fifth saw teeth 5 play a main cutting role, the second saw teeth 2 and the fourth saw teeth 4 are used as auxiliary teeth, and the deviated side angles are contacted with the side wall of the sawn joint after cutting to form support between the sawn joint and the saw blade, so that the thin-wall non-saw-tooth cutting condition of a cutting steel component is reduced, and the vibration of the saw blade is reduced. Therefore, the amount of division S1 of the second and

fourth serrations

2 and 4 and the amount of division S2 of the third and

fifth serrations

3 and 5 in fig. 2 are related to: s1 is more than or equal to S2 and more than 0. However, to reduce the increase in cutting force due to the short set teeth, S1 should be as close as possible to S2. In actual use, the edge of the blade body part of the offset tooth is relatively more prone to tipping and wearing, and in order to ensure that the second saw tooth 2 and the fourth saw tooth 4 can play a supporting role, considering that the wearing of the offset tooth is generally about 0.2mm, the relationship between the tooth dividing amount S1 and the tooth dividing amount S2 is preferably as follows: s2+0.2mm > S1 > S2.

Meanwhile, as the first saw tooth 1, the third saw tooth 3 and the fifth saw tooth 5 play a main cutting role, and in order to deal with the situation that the chip containing space is insufficient at the thick-wall position of the steel member, the first saw tooth 1, the third saw tooth 3 and the fifth saw tooth 5 need a larger chip containing space. And the second saw teeth 2 and the fourth saw teeth 4 only have a small amount of cutting edges to participate in cutting, so that the chip containing space is small. Thus, in the relationship, d1 ≈ d3 ≈ d4, d2 ≈ d4, and d1 ≈ d3 ≈ d4 > d2 ≈ d4, with d1 ≈ d3 ≈ d4 > 1.5d2 ≈ 1.5d4 being preferred. L1, L2, L3, L4, L5 also exhibit similar relationships, L1 ≈ L3 ≈ L5, L2 ≈ L4, and L1 ≈ L3 ≈ L5 > L2 ≈ L4, with preference: l1 ≈ L3 ≈ L5 > 1.5L2 ≈ 1.5L 4.

As shown in FIG. 4, after the invention (reference numeral 1) is adopted, when the thin-wall position of the H-shaped steel is cut, the number of the saw teeth participating in cutting is increased from 1 to 2 relative to the conventional tooth shape (reference numeral 2). As shown in fig. 5, after the invention (reference numeral 1) is adopted when cutting the position of the H-shaped steel intermediate rib plate, the number of actual cutting teeth is reduced by 40% (5 relatively short teeth) compared with the conventional tooth form (reference numeral 2), which can effectively reduce the cutting force when cutting the position of the rib plate. Second, the inventive example (reference number 1) has deeper gullets and better chip space than the conventional tooth (reference number 2) that undertakes the main cutting.

Claims

1. The utility model provides a band saw blade, includes saw blade body (10), it has a plurality of sawtooth group to arrange on saw blade body (10), every sawtooth group includes a plurality of sawtooth, the sawtooth that every sawtooth group corresponds has the same shape and arranges the order, a serial communication port, the sequencing in the same sawtooth group is that the height of odd sawtooth to saw blade body (10) back all is greater than the height of sequencing for the sawtooth of even number to saw blade body (10) back, or the sequencing in the same sawtooth group is that the height of sawtooth to saw blade body (10) back of the order for the even number all is greater than the height of sequencing for the sawtooth of odd number to saw blade body (10) back of the order.

2. A band saw blade according to claim 1, wherein the difference in height between every two adjacent saw teeth is 0.3 to 0.5 mm.

3. A band saw blade according to claim 1, characterized in that said set of teeth comprises a first tooth (1), a second tooth (2), a third tooth (3), a fourth tooth (4) and a fifth tooth (5) arranged in sequence, wherein the height of the first tooth (1), the third tooth (3) and the fifth tooth (5) to the back side of the blade body (10) is greater than the height of the second tooth (2), the fourth tooth (4) to the back side of the blade body (10).

4. A band saw blade according to claim 3, wherein said first (1), second (2), third (3), fourth (4) and fifth (5) teeth have respective tooth divisions of 0, S1, S2, S1, S2, wherein S1 ≧ S2 > 0.

5. A band saw blade according to claim 4, characterized in that the amount S1 of the second tooth (2) or the fourth tooth (4) is related to the amount S2 of the third tooth (3) or the fifth tooth (5): s2+0.2mm > S1 > S2.

6. A band saw blade according to claim 3, characterized in that the tooth spaces between two adjacent teeth of the first tooth (1), the second tooth (2), the third tooth (3), the fourth tooth (4) and the fifth tooth (5) are L1, L2, L3, L4 and L5 in that L1 ≈ L3 ≈ L5 > L2 ≈ L4; the tooth depths corresponding to the first saw tooth (1), the second saw tooth (2), the third saw tooth (3), the fourth saw tooth (4) and the fifth saw tooth (5) are d1, d2, d3, d4 and d5 respectively, wherein d1 ≈ d3 ≈ d5 > d2 ≈ d 4.

7. A band saw blade according to claim 6, wherein the tooth depths d1, d2, d3, d4 and d5 are in the following relationship: d1 ≈ d3 ≈ d5 > 1.5d2 ≈ 1.5d 4; the relationship between the pitches L1, L2, L3, L4 and L5 is: l1 ≈ L3 ≈ L5 > 1.5L2 ≈ 1.5L 4.