JP5272117B2 - Band saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band saw having a small cutting edge thickness and capable of attaining high durability without complicated work. <P>SOLUTION: The band saw 10 includes an endless belt 12. On one end side of the belt 12 in the width direction, there are formed a plurality of U-shaped cut portions 14 at intervals. Between these U-shaped cut portions 14, cutting edges 18 are firmly fixed. The cutting edge 18 is formed by bending a sheet material for a cutting edge whose plane shape is rectangular, for example, into a substantially U shape. The sheet material for the cutting edge is formed by bonding abrasive grain particles on a top face of a base material in a multiple-layer or a double layer structure using a thin metal layer. The sheet material for the cutting edge is firmly fixed on the belt 12 by brazing or the like while being bent along an end shape of the belt 12 after a central portion of the lower surface is pressed against a one-end side (upper end) face of the belt 12 in the width direction. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a band saw used in a cutting device or the like, and more particularly to a diamond band saw in which a plurality of cutting blades are fixed to a belt-like belt.

  In recent years, in order to reduce the cutting allowance for band saws used in cutting devices for cutting glass, ceramics, and various crystal materials (silicon crystal, crystal, sapphire, etc.), which are representative of hard brittle materials. Band saws having thin blades have been required.

  The band saw includes, for example, a band-shaped belt and a plurality of cutting blade tips fixed to one end side in the width direction of the belt with an interval, like a chip-type band saw described in Patent Document 1. ing. The cutting blade tip is obtained by mixing abrasive grains such as diamond powder and a material such as metal powder and sintering the mixture into a rectangular shape. This cutting blade tip is fixed to one end side in the width direction of the belt-like belt by brazing or the like. Thereafter, both sides of the cutting blade tip are polished to reduce the blade thickness. When such a band saw cuts a crystal material or the like, the cutting blade tip is brought into contact with the workpiece while rotating the belt, and the workpiece is cut by the abrasive grains contained in the cutting blade tip.

  Electrodeposited band saws are also known. Electrodeposition type band saws form a cutting blade by electrodepositing abrasive grains such as diamond powder on one end in the width direction of a belt-like belt by electroplating, and a band saw with a thin blade thickness can be obtained. .

JP-A-2005-96028

  However, in the case of the conventional tip type band saw, in order to reduce the blade thickness, both sides of the cutting blade tip have to be polished, and there is a problem that a complicated polishing operation is required.

  Also, in the case of a conventional electrodeposition type band saw, putting the entire belt in an electroplating tank and simultaneously electrodepositing abrasive grains such as diamond dust on one end of the belt in the width direction is very laborious. It is. Moreover, since the abrasive grains formed on the belt by the electrodeposition method are one layer (single layer), the durability of the electrodeposition type band saw was extremely low. In particular, since a band saw connects belt-shaped steel plates in a ring shape to create a belt, misalignment tends to occur at the joint. Therefore, since the belt swings up and down when the belt is rotated, the durability problem is important. In addition, there is a problem that it is difficult for the abrasive grains to be electrodeposited on the outer peripheral end face of the thin belt.

  Therefore, a main object of the present invention is to provide a band saw having a thin blade thickness and high durability without complicated work.

  The invention according to claim 1 is a band saw including a belt-like belt and a plurality of cutting blades fixed to one end side in the width direction of the belt at an interval, the cutting blade being a cutting blade sheet material. It is formed by having abrasive particles on the front side, folding the cutting blade sheet material to the back side, sandwiching one end in the width direction of the belt from both sides, and fixing the back side of the cutting blade sheet material to both sides of the belt This is a band saw.

  In the invention of claim 1, by using the cutting blade sheet material, a thin and uniform cutting blade sheet material can be easily formed. And since a cutting blade is formed using this sheet material for cutting blades, a cutting blade with a thin blade thickness can be obtained without requiring a complicated polishing operation for reducing the blade thickness.

  The invention according to claim 2 is an invention dependent on the invention according to claim 1, wherein the belt includes a blade portion formed at one end side in the width direction with a space therebetween, and the sheet material for a cutting blade is: A band saw that is bent to the back surface side, sandwiches the blade portion along the front surface, back surface, and end surface of the blade portion, and has a substantially U-shaped cross section.

  In the invention of claim 2, since the cutting blade sheet material is bent into a substantially U-shape to form the cutting blade, a complicated polishing operation for reducing the blade thickness is not required, and a thin cutting blade is obtained. can get.

The invention according to claim 3 is an invention dependent on the invention according to claim 2, wherein the blade portion has a front surface and a rear surface substantially parallel, the front surface and the end surface are orthogonal, and the rear surface and the end surface are orthogonal. A band saw characterized by
In the invention of claim 3, since the shape of the blade portion is substantially parallel to the front surface and the back surface, the front surface and the end surface are orthogonal to each other, and the back surface and the end surface are orthogonal to each other. It becomes easy to adhere to.

The invention according to claim 4 is an invention dependent on the invention according to claim 2 or claim 3, wherein the blade portion and the cutting blade are intermittently sandwiched by a notch portion provided at one end in the width direction of the belt. The plurality of blade portions and the cutting blade are formed such that the end surfaces thereof are formed at substantially the same height, the front surface thereof is formed on the substantially same surface, and the back surface thereof is formed on the substantially same surface. It is a band saw.
In the invention of claim 4, a cutting blade having a thin blade thickness can be obtained without requiring a complicated polishing operation for reducing the blade thickness.

The invention according to claim 5 is an invention dependent on the invention according to any one of claims 1 to 4, wherein the cutting blade sheet material is provided with a metal layer containing abrasive particles on the surface of the substrate. It is a band saw characterized by being.
In the invention of claim 5, since the cutting blade sheet material is provided with a metal layer containing abrasive particles on the surface of the base material, it is possible to select a material that can be easily bent as the base material. A material that can easily fix the abrasive particles to the belt can be selected as the metal layer.

The invention according to claim 6 is a band saw according to the invention according to claim 5, wherein the abrasive particles constitute a multilayer.
In the invention of claim 6, since the abrasive particles constitute a multi-layer (two or more layers), the durability of the band saw is remarkably enhanced as compared with a direct electrodeposition type band saw which is difficult to be multilayered with a single layer.

The invention according to claim 7 is an invention subordinate to the invention according to claim 5 or claim 6, wherein the abrasive particles are locally disposed in a region partitioned by a gap on the substrate. It is a featured band saw.
In the seventh aspect of the invention, since the abrasive particles are locally disposed on the base material in the region divided by the gap, the chips generated when the workpiece is cut by the band saw passes through the gap. Easily discharged.

The invention according to claim 8 is an invention dependent on the invention according to any one of claims 1 to 7, wherein the abrasive particles are at least one of cubic boron nitride particles, diamond particles, and alumina abrasive particles. It is a band saw characterized by being one.
In the invention of claim 8, since the abrasive particles are at least one of cubic boron nitride particles, diamond particles, and alumina abrasive particles, glass, ceramic, and various crystals that are typical hard brittle materials A band saw optimal for cutting materials (silicon crystal, quartz, sapphire, etc.) can be obtained.

  According to the present invention, by using the cutting blade sheet material, a thin and uniform cutting blade sheet material can be easily formed. And since a cutting blade is formed using this sheet material for cutting blades, a cutting blade with a thin blade thickness can be obtained without requiring a complicated polishing operation for reducing the blade thickness.

  The above-described object, other objects, features, and advantages of the present invention will become more apparent from the following description of embodiments for carrying out the invention with reference to the drawings.

It is an external appearance perspective view which shows 1st Embodiment of the band saw which concerns on this invention. It is the figure which expanded the part of the cutting blade of the band saw shown in FIG. 1, (a) is a front view, (b) is a top view, (c) is a rear view. It is an external appearance perspective view which shows the belt shown in FIG. It is the figure which expanded the blade part of the belt shown in FIG. 3, (a) is a front view, (b) is a top view, (c) is a rear view. It is a top view which shows the sheet | seat material for cutting blades. It is a schematic sectional drawing for demonstrating an example of the method of attaching the sheet | seat material for cutting blades shown in FIG. 5 to a band saw. It is an external appearance perspective view which shows 2nd Embodiment of the band saw which concerns on this invention. It is the figure which expanded the part of the cutting blade of the band saw shown in FIG. 7, (a) is a front view, (b) is a top view, (c) is a rear view. It is a top view which shows the sheet | seat material for cutting blades. It is an external appearance perspective view which shows 3rd Embodiment of the band saw which concerns on this invention. It is the figure which expanded the part of the cutting blade of the band saw shown in FIG. 10, (a) is a front view, (b) is a top view, (c) is a rear view. It is a top view which shows the sheet | seat material for cutting blades. It is a cross-sectional view which shows the modification of the sheet material for cutting blades. It is a top view solution figure which shows the formation method of the sheet | seat material for cutting blades.

(1st Embodiment, FIGS. 1-6)
FIG. 1 is an external perspective view showing a band saw according to a first embodiment of the present invention. 2A and 2B are enlarged views of the cutting blade 18 of the band saw 10, wherein FIG. 2A is a front view, FIG. 2B is a plan view, and FIG. 2C is a rear view. The band saw 10 includes an endless belt 12. FIG. 3 is an external perspective view showing the belt 12. 4A and 4B are enlarged views of the blade portion 16 of the belt 12. FIG. 4A is a front view, FIG. 4B is a plan view, and FIG. 4C is a rear view.
The belt 12 is formed with a plurality of U-shaped cut portions 14 in front view on one end side in the width direction (upper side in FIG. 3) at intervals. Blade portions 16 are formed between the cut portions 14 respectively.

  As shown in FIG. 4, the blade portion 16 has a front surface 16a, a back surface 16b, an end surface 16c, and two side surfaces 16d. As shown in FIG. 4A, the front surface 16a has a shape in which a portion on the tip end side of the blade portion 16 is substantially rectangular and a portion on the base side widens at the bottom. Similarly, as shown in FIG. 4C, the back surface 16b also has a shape in which the portion on the tip side is substantially rectangular and the portion on the root side widens at the bottom. As shown in FIG. 4B, the end face 16c is a rectangular plane. In the blade portion 16, the front surface 16a and the back surface 16b are substantially parallel, the front surface 16a and the end surface 16c are orthogonal, and the back surface 16b and the end surface 16c are orthogonal. Further, in the side surface 16d, the tip side portion of the blade portion 16 is a flat surface, and the base side portion is a curved surface. The height (distance from the end surface 16c to the root) H1, the width W1, and the thickness T1 of the blade portion 16 are variously selected according to the object to be cut. The thickness T1 is the same as the thickness of the belt 12. The plurality of blade portions 16 have end surfaces 16c formed at substantially the same height, front surfaces 16a formed on substantially the same surface, and rear surfaces 16b formed on substantially the same surface. As the material of the belt 12, for example, a quenched steel strip or steel plate having a length of 3700 mm, a width of 80 mm, and a thickness of 0.4 mm is used. The belt 12 is created by connecting the steel strips or steel plates constituting the belt 12 in a ring shape. As shown in FIG. 2, a cutting blade 18 is fixed to the blade portion 16. The pitch dimension P and the width dimension W of the cutting blade 18 are variously selected according to the object to be cut. For example, the pitch dimension P is designed to be 10 mm and the width dimension W is set to 5 mm, or the pitch dimension P is designed to be 20 mm and the width dimension W is designed to be 10 mm.

  As shown in FIG. 5, the cutting blade 18 is formed, for example, by bending a cutting blade sheet material 118 having a rectangular shape in plan view to the back surface side so that the cross section is substantially U-shaped. As shown in FIG. 2, the cutting blade 18 has a front surface 18 a, a back surface 18 b, and an end surface 18 c on the front surface side, and a fixing surface with the blade portion 16 on the back surface side. As shown in FIG. 2A, the front surface 18a has a rectangular shape. Similarly, as shown in FIG. 2C, the back surface 18b has a rectangular shape. The front surface 18a and the back surface 18b of the cutting blade 18 are disposed on the front surface 16a and the back surface 16b of the blade portion 16, respectively. The front surface 18a of the cutting blade 18 is designed to cover almost the upper half of the front surface 16a of the blade portion 16, so that its height H2 is designed to be almost ½ of the height H1 of the blade portion 16, and its width W2 is It is designed to be equal to the width W1 of the portion 16. Similarly, the back surface 18b of the cutting blade 18 is designed to have a height H2 that is approximately ½ of the height H1 of the blade portion 16 so as to cover almost the upper half of the back surface 16b of the blade portion 16, and its width. W2 is designed to be equal to the width W1 of the blade portion 16. As shown in FIG. 2B, the end face 18c of the cutting blade 18 has a rectangular shape. The end surface 18c is disposed on the end surface 16c in order to cover the entire end surface 16c of the blade portion 16. The width W2 of the end face 18c is equal to the width W1 of the blade portion 16, and the thickness D is the total of the thickness T1 of the blade portion 16 and twice the thickness of the cutting blade sheet material 118. The plurality of cutting blades 18 have end surfaces 18c formed at substantially the same height, front surfaces 18a formed on substantially the same surface, and rear surfaces 18b formed on substantially the same surface. The cutting blade 18 is not disposed on the two side surfaces 16 d of the blade portion 16.

The cutting blade sheet material 118 is provided with a first abrasive layer 24a and a second abrasive layer 24b containing abrasive particles 22 on the upper surface of a plate-like substrate 20 such as thin copper, brass, or steel. . The plating layer constituting the first abrasive grain layer 24 a is a thin metal layer, for example, a thickness of 0.1 mm (representative value), and has a function as an adhesive for fixing the abrasive grains 22 to the base material 20.
The plating layer constituting the second abrasive layer 24b is a thin metal layer, for example, a thickness of 0.1 mm (representative value), and functions as an adhesive for fixing the abrasive particles 22 to the first abrasive layer 24a. Have.
Furthermore, in this 1st Embodiment, as shown in FIG. 6, the abrasive particle 22 is comprised by the multilayer (two or more layers). As a material of the substrate 20, for example, a copper plate having a thickness of 0.05 mm (representative value) is used. For example, nickel, copper, tin, or an alloy thereof is used as a material of the plating layer or the metal layer for fixing the abrasive particles 22 of the first abrasive layer 24a and the second abrasive layer 24b.

  As the material of the abrasive particles 22, for example, diamond particles having a particle size of 120 # (about 105 μm), cubic boron nitride particles, or alumina abrasive particles are used. By using these abrasive particles, a band saw 10 optimum for cutting glass, ceramics, and various crystal materials (silicon crystal, crystal, sapphire, etc.), which are typical hard brittle materials, can be obtained.

Further, the band saw 10 will be described in detail together with an example of a manufacturing method thereof.
First, a strip-shaped steel plate is prepared, and a plurality of U-shaped cut portions 14 in front view are formed by pressing at one end side in the width direction with a gap therebetween. As a result, a blade portion 16 is formed between the cut portions 14 as viewed from the front, with the front end portion being substantially rectangular and the base portion being flared. Next, the belt 12 is created by connecting the steel plates in a ring shape.

The cutting blade sheet material 118 shown in FIG. 5 is produced, for example, by the method described below.
That is, a base material 20 such as a strip-like copper plate or sheet-like material is prepared as a base metal for fixing the abrasive particles 22 by the electrodeposition method.
On the surface of the base material 20 forming the base metal, the first abrasive layer 24a in which the abrasive particles 22 are bound by a thin plated metal layer is formed by an electrodeposition process, and the abrasive particles 22 are thin by the electrodeposition process. A second abrasive grain layer 24b bound with a plated metal layer is formed.
Further, in order to reinforce the first abrasive layer 24a and the second abrasive layer 24b, as shown in FIG. 13, an alloy is plated or coated on the second abrasive layer 24b, and the reinforcing layer 26 is formed. It may be formed. The alloy that forms the reinforcing layer 26 may be one that melts at 600 ° C. or higher.
Further, as shown in FIG. 14, a group of abrasive particles 22 in which the abrasive particles 22 are solidified and electrodeposited are formed side by side at appropriate intervals on a straight line, and are arranged in multiple rows at appropriate intervals. They may be juxtaposed. By doing so, the distribution density of the abrasive particles 22 arranged on the surface can be made uniform.
The cutting blade sheet material 118 is used by cutting the large cutting blade sheet material 118 into an appropriate size (cut along the two-dot chain line in FIG. 14). For example, the group of abrasive particles 22 is linear. It may be bent along the end shape of the belt 12 on the line (on the alternate long and short dash line in FIG. 14). This is because the density of the abrasive particles can be made uniform.
Thus, the cutting blade sheet material 118 having a thickness of 0.25 mm (representative value) is obtained. That is, the cutting blade sheet material 118 having a thin and uniform thickness can be easily formed.

The base material 20 is formed so that the width W2 is equal to the width W1 of the blade portion 16, and the length L of the base material 20 is set to the height H2 of each of the front surface 18a and the back surface 18b of the cutting blade 18 and the length of the end surface 18c. To the total dimension.
Next, as shown in FIG. 6A, the central portion of the lower surface (rear surface) of the cutting blade sheet material 118 has a rectangular shape in plan view of the blade portion 16 on one end side (upper side) in the width direction of the belt 12. It is fixed to the end face 16c by brazing, soldering, synthetic resin adhesive or the like. Then, it bend | folds along the edge part shape of the belt 12 to the back surface side (base material 20 side). That is, both sides of the cutting blade sheet material 118 are left at right angles with the edge of the tip portion of the blade portion 16 as a fulcrum, except for the center portion fixed to the end surface 16c of the blade portion 16, The blade portion 16 is sandwiched from both sides by folding to the back side (base material 20 side). Then, both sides of the cutting blade sheet material 118 are fixed to the front surface 16a and the back surface 16b of the blade portion 16 by brazing or the like. When the cutting blade sheet material 118 is bent, it is reinforced with an alloy so that the abrasive particles 22 in the bent portion are not peeled off from the plated metal layers constituting the first abrasive layer 24a and the second abrasive layer 24b. Some ideas have been devised. Further, since the U-shaped cut portion 14 is formed in the belt 12, heat at the time of brazing is dissipated, and deformation of the belt 12 due to heat can be prevented.

  Thus, as shown in FIG. 6B, the cutting blade sheet material 118 has a U-shaped cross section, and the front surface 18a, the back surface 18b, and the end surface of the front surface 16a, the back surface 16b, and the end surface 16c of the blade portion 16, respectively. The cutting blade 18 is provided with 18c. In the blade portion 16, the front surface 16a and the back surface 16b are substantially parallel, the front surface 16a and the end surface 16c are orthogonal to each other, and the back surface 16b and the end surface 16c are orthogonal to each other. Can be easily fixed to. Regardless of the length of the belt 12, the cutting blade 18 can be easily formed by an operation in which the cutting blade sheet material 118 is sequentially applied to the blade portion 16 and fixed while being bent.

  The band saw 10 can form the cutting blade 18 by bending a thin and uniform thickness of the cutting blade sheet material 118 into a substantially U shape, and thus requires a complicated polishing operation to reduce the blade thickness. The cutting blade 18 having a thin blade thickness can be obtained. The thickness D is the sum of the thickness of the belt 12 (0.4 mm) and twice the thickness of the cutting blade sheet material 118 (0.25 mm), and is 0.9 mm (representative value). And thin.

  Further, in the cutting device using the band saw 10, the cutting blade 18 is brought into contact with the object to be cut while the belt 12 is rotated by putting the belt 12 in tension. Thereby, the workpiece is cut by the abrasive particles 22 of the cutting blade 18. A cutting fluid such as water or oil is used when cutting the workpiece. By using such a cutting fluid, the band saw 10 is cooled, and damage to the band saw 10 due to heat can be prevented. Moreover, chips are removed by the cutting fluid.

  At this time, since the abrasive particles 22 are locally disposed on the base material 20 in the region delimited by the gap G, the cutting blade 18 comes into contact with the workpiece when the workpiece is cut by the band saw 10. Chips generated in the portion (between the cutting blade 18 and the workpiece) are easily discharged through the gap G. As a result, the cutting efficiency of the band saw 10 is improved.

  Since the sheet-type band saw 10 having the above-described configuration is formed by cutting the sheet material 118 for a cutting blade having a thin and uniform thickness into a substantially U-shape to form the cutting blade 18, a complicated polishing operation for reducing the blade thickness. In addition, the cutting blade 18 having a thin blade thickness can be obtained accurately and easily without requiring a cumbersome operation of electrodepositing abrasive particles in an electroplating tank. Specifically, the thickness accuracy of the cutting blade 18 can be suppressed within 50 μm. On the other hand, in the case of a conventional tip type band saw in which a cutting blade tip is polished to form a thin blade, it is difficult to suppress the thickness accuracy of the cutting blade to within 50 μm.

  Further, the abrasive particles 22 can be easily formed on the end surface 16c of the blade portion 16 provided on one end side (upper side) of the thin belt 12 which is difficult with the conventional electrodeposition type band saw. In addition, since the abrasive particles 22 can be formed into a multilayer (two or more layers), the band saw 10 having higher durability can be obtained as compared with the conventional electrodeposition type band saw that can form only one layer of abrasive particles.

  Furthermore, since the cutting blade sheet material 118 is provided with the first abrasive grain layer 24 a and the second abrasive grain layer 24 b including the abrasive particles 22 on the base material 20, the base material 20 can be easily bent. A material can be selected, and a material that can easily fix the abrasive particles 22 as a fixing material such as a metal forming a plated metal layer for forming the first abrasive layer 24a and the second abrasive layer 24b can be selected. it can.

(Second Embodiment, FIGS. 7 to 9)
FIG. 7 is an external perspective view showing a second embodiment of the band saw according to the present invention. 8A and 8B are enlarged views of the cutting blade 28 of the band saw 10A. FIG. 8A is a front view, FIG. 8B is a plan view, and FIG. 8C is a rear view.
The band saw 10A includes an endless belt 12.
The belt 12 is formed with a plurality of U-shaped cut portions 14 at one end side in the width direction (upper side in FIG. 7) at intervals. Between the cut portions 14, a blade portion 16 is formed in which the front end portion is substantially rectangular and the root side portion is widened in the front view.
As shown in FIG. 8, a cutting blade 28 is fixed to the blade portion 16.
The band saw 10A of the second embodiment has the same components and parts as those of the band saw 10 of the first embodiment except for the cutting blade sheet material 128 and the cutting blade 28. Is omitted.

  As shown in FIG. 9, the cutting blade 28 is formed by, for example, bending a cutting blade sheet material 128 having a rectangular shape in plan view to the back surface side so that the cross section is substantially U-shaped. The cutting blade sheet material 128 is provided with a first abrasive grain layer 24 a and a second abrasive grain layer 24 b including abrasive grains 22 on the upper surface of the substrate 20. The plating layer or metal layer constituting the first abrasive grain layer 24 a and the second abrasive grain layer 24 b has a function as an adhesive for fixing the abrasive grains 22 to the substrate 20. The abrasive particles 22 are locally disposed in a region partitioned by a gap G formed in a lattice shape. Furthermore, in this 2nd Embodiment, the abrasive particle 22 is comprised by the multilayer (two or more layers).

  As shown in FIG. 8, the cutting blade 28 has a front surface 28 a, a back surface 28 b, and an end surface 28 c on the front surface side, and a fixing surface to the blade portion 16 on the back surface side. As shown in FIG. 8A, the front surface 28a has a rectangular shape. Similarly, as shown in FIG. 8C, the back surface 28b has a rectangular shape. The front surface 28a and the back surface 28b of the cutting blade 28 are disposed on the front surface 16a and the back surface 16b of the blade portion 16, respectively. Since the front surface 28a of the cutting blade 28 covers almost the entire front surface 16a of the blade portion 16 from the distal end side to the root side of the blade portion 16, its height H3 is approximately 90% of the height H1 of the blade portion 16. The width W2 is designed to be equal to the width W1 of the blade portion 16. Similarly, the back surface 28b of the cutting blade 28 is also designed to have a height H3 of approximately 90% of the height H1 of the blade portion 16 in order to cover almost the entire back surface 16b of the blade portion 16, and the width W2 thereof is It is designed to be equal to the width W1 of the portion 16. As shown in FIG. 8B, the end face 28c of the cutting blade 28 has a rectangular shape. The end face 28c is disposed on the end face 16c in order to cover the entire end face 16c of the blade portion 16. The width W2 of the end face 28c is equal to the width W1 of the blade portion 16, and the thickness D is a total dimension of the thickness T1 of the blade portion 16 and twice the thickness of the cutting blade sheet material 128. In this manner, the cutting blade 28 and the blade portion are covered by the front surface 28a and the back surface 28b of the cutting blade 28 covering substantially the entire front surface 16a and the back surface 16b of the blade portion 16 from the distal end side to the root side of the blade portion 16. 16 can be fixed in a wide area, and a strong fixing force can be obtained. The plurality of cutting blades 28 have end faces 28c formed at substantially the same height, front faces 28a formed on substantially the same faces, and rear faces 28b formed on substantially the same faces. Note that the cutting blade 28 is not disposed on the two side surfaces 16 d of the blade portion 16.

Further, the band saw 10A will be described together with an example of the manufacturing method thereof.
First, a strip-shaped steel plate is prepared, and a plurality of U-shaped incisions 14 are formed by pressing at one end side in the width direction with a gap therebetween. As a result, a blade portion 16 is formed between the cut portions 14 as viewed from the front, with the front end portion being substantially rectangular and the base portion being flared. Next, the belt 12 is created by connecting the steel plates in a ring shape.

  The cutting blade sheet material 128 having a predetermined size in a plan view shown in FIG. 9 is produced by the same manufacturing method as the cutting blade sheet material 118 described in the first embodiment. Therefore, detailed description thereof is omitted. The width W2 of the cutting blade sheet material 128 is designed to be equal to the width W1 of the blade portion 16, and the length L of the cutting blade sheet material 128 is the height H3 of each of the front surface 28a and the back surface 28b of the cutting blade 28. And the length D of the end face 28c are designed to be a total dimension.

  Next, the center part of the lower surface (back surface) of the cutting blade sheet material 128 is fixed to one end side (upper side) of the belt 12 in the width direction by a brazing or the like in the rectangular end surface 16c in a plan view. . Then, it bend | folds along the edge part shape of the belt 12 to the back surface side (base material 20 side). That is, both sides of the cutting blade sheet material 128 leave the center portion fixed to the end face 16c of the blade portion 16 as shown by an arrow R at right angles with the edge of the tip portion of the blade portion 16 as a fulcrum. The blade portion 16 is sandwiched from both sides by folding to the back side (base material 20 side). Then, both sides of the cutting blade sheet material 128 are fixed to the front surface 16a and the back surface 16b of the blade portion 16 by brazing or the like.

  Since brazing has to be bonded at a relatively high temperature, it is suitable for bonding in a small area, and since a synthetic resin adhesive can be bonded at room temperature, it is suitable for bonding in a relatively large area. For example, in the first embodiment, brazing is selected, and in the second embodiment, an adhesive is selected.

  Thus, the cutting blade sheet material 128 has a U-shaped cross section, and the cutting blade 28 has the front surface 28a, the back surface 28b, and the end surface 28c disposed on the front surface 16a, the back surface 16b, and the end surface 16c of the blade portion 16, respectively. The The sheet-type band saw 10A having the above configuration also forms the cutting blade 28 by bending the thin and uniform thickness of the cutting blade sheet material 128 into a substantially U-shape, and therefore a complicated polishing operation for reducing the blade thickness. In addition, it is possible to obtain the cutting blade 28 with a thin blade thickness accurately and easily without requiring the troublesome work of electrodepositing abrasive particles in the electroplating tank, and with the band saw 10 of the first embodiment. Similar effects can be obtained.

(Third embodiment, FIGS. 10 to 12)
FIG. 10 is an external perspective view showing a third embodiment of the band saw according to the present invention. FIG. 11 is an enlarged view of a portion of the cutting blade 38 of the band saw 10B, where (a) is a front view, (b) is a plan view, and (c) is a rear view. The band saw 10B includes an endless belt 12. On one end side in the width direction of the belt 12 (upper side in FIG. 10), a plurality of U-shaped cut portions 14 are formed at intervals. Between the cut portions 14, a blade portion 16 is formed in which the front end portion is substantially rectangular and the root side portion is widened in the front view. As shown in FIG. 11, a cutting blade 38 is fixed to the blade portion 16. In addition, in the band saw 10B of 3rd Embodiment, since it has the same components and part as the band saw 10 of the above-mentioned 1st Embodiment except the sheet | seat material 138 for cutting blades, and the cutting blade 38, the detailed description Is omitted.

  As shown in FIG. 12, the cutting blade 38 is formed by bending a cutting blade sheet material 138 having a substantially square planar shape to the back surface side so that the cross section is substantially U-shaped. The cutting blade sheet material 138 is provided with a first abrasive grain layer 24 a and a second abrasive grain layer 24 b containing abrasive grains 22 on the upper surface of the base material 20. The plating layer or metal layer constituting the first abrasive grain layer 24 a and the second abrasive grain layer 24 b has a function as an adhesive for fixing the abrasive grains 22 to the substrate 20. The abrasive particles 22 are locally disposed in a region partitioned by a gap G formed in a lattice shape. Furthermore, in this 3rd Embodiment, the abrasive particle 22 is comprised by the multilayer (two or more layers).

  As shown in FIG. 11, the cutting blade 38 has a front surface 38a, a back surface 38b, and an end surface 38c on the front surface side, and a fixing surface with the blade portion 16 on the back surface side. As shown in FIG. 11A, the front surface 38a has an inverted right triangle shape. Similarly, as shown in FIG. 11C, the back surface 38b has an inverted right triangle shape. The front surface 38a and the back surface 38b of the cutting blade 38 are disposed on the front surface 16a and the back surface 16b of the blade portion 16, respectively. Since the front surface 38a of the cutting blade 38 covers almost half of the area of the front surface 16a of the blade portion 16, its height H4 is the height H1 of the blade portion 16 from the tip side to the root side. The width W2 is designed to be equal to the width W1 of the blade portion 16. Similarly, the back surface 38b of the cutting blade 38 is designed to have a height H4 substantially equal to the height H1 of the blade portion 16 so as to cover almost half of the area of the front surface 16a of the blade portion 16, and its width W2 is It is designed to be equal to the width W1 of the blade portion 16. As shown in FIG. 11B, the end face 38c of the cutting blade 38 has a rectangular shape. The end surface 38 c is disposed on the end surface 16 c in order to cover the entire surface of the end surface 16 c of the blade portion 16. The width W2 of the end face 38c is equal to the width W1 of the blade portion 16, and the thickness D is a total dimension of the thickness T1 of the blade portion 16 and twice the thickness of the cutting blade sheet material 138. Thus, by making the shape of the front surface 38a and the back surface 38b of the cutting blade 38 into an inverted right triangle shape, the cutting blade 38 that is easy to manufacture and excellent in cutting performance can be obtained. The plurality of cutting blades 38 have end surfaces 38c formed at substantially the same height, front surfaces 38a formed on substantially the same surfaces, and back surfaces 38b formed on substantially the same surfaces. Note that the cutting blade 38 is not disposed on the two side surfaces 16 d of the blade portion 16.

Further, the band saw 10B will be described in detail together with an example of a manufacturing method thereof.
First, a strip-shaped steel plate is prepared, and a plurality of U-shaped incisions 14 are formed by pressing at one end side in the width direction with a gap therebetween. As a result, a blade portion 16 is formed between the cut portions 14 as viewed from the front, with the front end portion being substantially rectangular and the base portion being flared. Next, the belt 12 is created by connecting the steel plates in a ring shape.

  The cutting blade sheet material 138 having a predetermined size in a plan view shown in FIG. 12 is produced by the same manufacturing method as the cutting blade sheet material 118 described in the first embodiment. Therefore, detailed description thereof is omitted. The cutting blade sheet material 128 is cut out at two opposite corners so that the width W2 of the cutting blade sheet 128 is equal to the width W1 of the blade 16 in the direction connecting the two opposite corners. The length L of the cutting blade sheet material 138 is designed to have a total dimension of the height H4 of the front surface 38a and the back surface 38b of the cutting blade 38 and the length D of the end surface 38c.

  Next, the cutting blade sheet material 138 has a lower surface (rear surface) center portion at one end side (upper side) in the width direction of the belt 12 in accordance with an opposing line in which two opposing corner portions are cut out. The portion 16 is fixed to the end face 16c having a rectangular shape in plan view by brazing or the like. Then, it bend | folds along the edge part shape of the belt 12 to the back surface side (base material 20 side). That is, both sides of the cutting blade sheet material 138 are perpendicular to each other with the edge of the tip end portion of the blade portion 16 as a fulcrum, leaving the central portion fixed to the end surface 16c of the blade portion 16. The blade portion 16 is sandwiched from both sides. Then, both sides of the cutting blade sheet material 138 are respectively fixed to the front surface 16a and the back surface 16b of the blade portion 16 by brazing or the like.

  Thus, the cutting blade sheet material 138 has a U-shaped cross section, and the cutting blade 38 is provided with the front surface 38a, the back surface 38b, and the end surface 38c on the front surface 16a, the back surface 16b, and the end surface 16c, respectively. The The sheet-type band saw 10B having the above-described configuration also forms the cutting blade 38 by bending the thin and uniform thickness of the cutting blade sheet material 138 into a substantially U shape, so that a complicated polishing operation for reducing the blade thickness is required. In addition, the cutting blade 38 having a thin blade thickness can be obtained accurately and easily without requiring a complicated operation of electrodepositing abrasive particles in an electroplating tank, and the band saw 10 of the first embodiment can be obtained. Similar effects can be obtained.

(Other embodiments)
In addition, this invention is not limited to the said embodiment, A various deformation | transformation is carried out within the range of the summary. For example, in the above-described embodiment, the abrasive particles 22 are locally disposed on the upper surface of the base material 20, but the present invention is not necessarily limited thereto, and is uniformly disposed on the entire upper surface of the base material 20. May be.

10, 10A, 10B Band saw 12 Belt 14 U-shaped cut portion 16 Blade portion 16a Front surface 16b Rear surface 16c End surface 16d Side surface 18, 28, 38 Cutting blades 18a, 28a, 38a Front surface 18b, 28b, 38b Rear surface 18c, 28c, 38c End face 118, 128, 138 Cutting blade sheet material 20 Base material 22 Abrasive particle 24a First abrasive layer 24b Second abrasive layer G Gap

Claims (8)

A band saw including a belt-like belt and a plurality of cutting blades fixed to one end side in the width direction of the belt with an interval therebetween,
The cutting blade has abrasive particles on the front surface side of the cutting blade sheet material, bends the cutting blade sheet material to the back surface side and sandwiches one end in the width direction of the belt from both sides, and the cutting blade sheet material A band saw characterized in that it is formed by adhering the back side of the belt to both sides of the belt.   The belt includes a blade portion formed at an interval on one end side in the width direction, and the cutting blade sheet material is bent to the back surface side and cut along the front surface, the back surface, and the end surface of the blade portion. The band saw according to claim 1, wherein the cross section is formed in a substantially U shape.   The band saw according to claim 2, wherein the blade portion has a front surface and a back surface that are substantially parallel, a front surface and an end surface are orthogonal to each other, and a back surface and an end surface are orthogonal to each other.   The blade portion and the cutting blade are intermittently formed with a cut portion provided at one end in the width direction of the belt interposed therebetween, and the plurality of blade portions and the cutting blade have substantially the same end face. The band saw according to claim 2 or 3, wherein the front surface is formed on substantially the same surface and the back surface is formed on the substantially same surface.   The band saw according to any one of claims 1 to 4, wherein the cutting blade sheet material is provided with a metal layer containing abrasive particles on a surface of a base material.   The band saw according to claim 5, wherein the abrasive particles constitute a multilayer.   The band saw according to claim 5 or 6, wherein the abrasive particles are locally disposed on the base material in a region partitioned by a gap.   The band saw according to any one of claims 1 to 7, wherein the abrasive particles are at least one of cubic boron nitride particles, diamond particles, and alumina abrasive particles.

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