JPH0929541A - Circular saw, its manufacture, and its fitting method to cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the excellent cutting ability by setting the diameter and the rake angle to the prescribed values, and making a cutting blade sufficiently bite into a work. SOLUTION: A circular saw 1 is 300-500mm in diameter. About forty base pieces 3 are formed on the outer circumferential part of a circular saw body 2 of the circular saw 1. A cutting blade 5 of cermet tip is implanted in each base piece 3. The projection of each cutting blade 5 from the highest part 7 of the base piece 3 is set to 0.25-0.5mm. The rake angle θ of the cutting blade 5 is set to -3 deg.-+7 deg.. Because the cutting blade 5 is projected in the circular saw 1, the cutting ability is not deteriorated. The circular saw has excellent characteristics of keeping the excellent cutting ability immediately before the saw is completely out of use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular saw having a cutting edge constituted by a cermet tip, a method for manufacturing the circular saw, and a method for mounting the circular saw on a cutting device.

[0002]

2. Description of the Related Art A circular saw having a grindstone-shaped cutting blade is used for cutting an angle made of metal such as iron or stainless steel. This circular saw was mounted on a cutting device and was installed at 3800r. p.
m. Can be rotated in degrees. A cutting device that uses a circular saw with a grindstone-shaped blade has a rotation speed that is almost the same as the rotation speed of the motor that is used, so the speed reduction mechanism can be simple and the cutting device is simple. It has the characteristic of being inexpensive.

[0003]

However, when a circular saw having a grindstone-shaped cutting edge is used, the material to be cut is scraped off and cut, so that the material is wasted and the cut portion becomes hot due to frictional heat. There is a problem that the material changes after being hardened. Further, since it takes a long time to cut, workability is poor, and burrs are formed on the cut portion, so that there is a problem that work for removing the burrs is required. Furthermore, the durability of the circular saw is low, and there is a problem that the cutting ability is immediately deteriorated. In addition, metal powder such as iron powder generated during cutting is harmful to health if inhaled.
Furthermore, noise during cutting is also a problem.

Conventionally, there is a circular saw using a cutting edge of a cermet tip, which is 1400r.
p. m. The number of cutting edges is 70
About one. This is 3800 r. p. m. If it is used at a rotation speed of the order of magnitude, the cutting edge will be clogged and seized, and a circular saw using a cermet tip will produce a 3800 r.
p. m. It was said that it could not be used at a moderate rotation speed. A circular saw with a grindstone-shaped cutting edge has a large thickness, and a circular saw with a cutting edge with a cermet tip with a small thickness can be installed in a cutting device that uses this type of circular saw. There was something I couldn't do.

When manufacturing a circular saw having a cutting edge of a cermet tip, the circular saw body is punched or laser-cut, and then the cermet tip is planted on the base metal of the circular saw body. In order to increase the strength of the circular saw body, it is desirable to quench the circular saw body, but if the quenching process is performed, the circular saw body will be distorted. There is a problem that management becomes impossible.

The present invention has been made by paying attention to the above-mentioned conventional problems, and can be applied to a conventional cutting device equipped with a circular saw having a grindstone-shaped cutting edge, which does not waste material and reduces friction heat. There is little generation, the material to be cut does not change due to heat, there is no risk of seizure, the cutting time is short, burrs do not occur, and the durability is high. Circular saw and manufacturing method of circular saw that can control the protruding dimension of the cutting edge of the cermet tip with high accuracy even if the circular saw body is hardened without causing metal powder or noise. And a method of attaching the circular saw to a cutting device.

[0007]

According to a first aspect of the present invention, there is provided a circular saw body, a base metal formed on the circular saw main body, and a cutting edge constituted by a cermet tip planted on the base metal. Circular saw with a diameter of 300 mm to 500 m
m, a rake angle is −3 ° to + 7 °, and a protruding dimension of the cutting edge from the base metal is 0.25 mm to 0.5 mm.

According to a second aspect of the present invention, a main body forming step of forming a circular saw body, a quenching step of subjecting the circular saw body to a quenching step, and a peripheral surface of the circular saw body that has undergone the quenching step are polished to form a center. Polishing process to make the distance from the to the peripheral surface uniform,
A method of manufacturing a circular saw, comprising: a cermet tip planting step of planting a cutting edge constituted by a cermet tip on a base metal of the circular saw body that has undergone the polishing step.

According to a third aspect of the present invention, the rotary shaft is inserted through the hole of the circular saw in which the cutting edge of the cermet tip is planted, and is fixed to the rotary shaft, and is fixed to the rotary shaft. In a method of attaching a circular saw to a cutting device, in which a circular saw is held by a holding plate and a circular saw attached to a rotating shaft, a spacer made of an elastic body is interposed between the circular saw and the holding plate. This is a method for attaching a circular saw to a cutting device.

[0010]

According to the invention of claim 1, the diameter is from 300 mm to 5 mm.
Since the rake angle is set to 00 mm and the rake angle is from -3 ° to + 7 °, the cutting edge can sufficiently cut into the material to be cut, exhibiting high cutting ability, and the protruding dimension of the cutting edge from the base metal is 0.2.
Since it is set to 5 mm to 0.5 mm, it is possible to prevent the cutting edge from coming off the base metal.

According to the second aspect of the present invention, the circular saw body is formed by punching or cutting with a laser in the body forming step, and the circular saw body is heated and hardened in the quenching step. Next, the peripheral surface of the circular saw body is polished to make the distance from the center to the peripheral surface uniform, and then, in the cermet tip implanting step, the cutting edge of the cermet tip is implanted on the base metal of the circular saw body.

According to the third aspect of the present invention, the rotary shaft is passed through the hole of the circular saw, and the circular saw is brought into contact with the support plate fixed to the rotary shaft, and the spacer constituted by the elastic body is provided with the circular saw. The circular saw is attached to the rotary shaft by interposing it between the press plate and the press plate. Therefore, make sure to attach a circular saw with a small thickness of a circular saw body with a cutting edge of a cermet tip to the rotary shaft of a cutting device that uses a circular saw with a grindstone-shaped cutting edge and a large thickness. You can Further, vibrations when the circular saw rotates are absorbed, and noise generation is reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A circular saw 1 according to an embodiment of the present invention will be described with reference to the drawings. This circular saw 1 has a diameter of 305 mm, 35
5 mm and 405 mm. Circular saw body 2 of circular saw 1
The base metal 3 is formed at 40 locations on the outer peripheral portion of the. A cutting edge 5 of a cermet tip is planted in each of the bases 3. As shown in the enlarged view of FIG. 2, the cutting edge 5 is a base metal 3.
The protrusion dimension α from the highest portion 7 of is set to 0.3 mm. Further, the rake angle θ of the cutting edge 5 is set to 0 °.

A cutting device 9 is shown in FIG.
Is used by attaching a circular saw having a grindstone-shaped cutting edge. Reference numeral 11 indicates a base, and a support shaft 13 is provided on the base 11, and an arm 16 is attached to the support shaft 13. An oscillating portion 15 is fixed to the arm 16. The oscillating portion 15 can oscillate with the support shaft 13 as a fulcrum, and is urged in a lifting direction by a spring (not shown).

The swinging portion 15 is provided with a motor and a rotary shaft 14 rotated by the motor, and the circular saw 1 is fixed to the rotary shaft 14. As shown in FIG. 4, a support plate 18 is fixedly provided on the rotary shaft 14,
The circular saw 1 is attached to the protruding portion 14a protruding from the support plate 18 of the. The female screw 1 is attached to the tip surface of the protruding portion 14a.
0 is formed. The swinging portion 15 is provided with a grip portion 19, and a switch 21 for turning the motor on and off is attached to the grip portion 19. Reference numeral 23 indicates a cover, which covers almost half of the circular saw 1.

A holding member 25 is provided on the base 11, and a holding member 29 attached to the tip of the screw shaft 27 is arranged so as to face the holding member 25.
The screw shaft 27 is inserted into the female screw base 31, and a handle 33 is attached to the base end of the screw shaft 27.

A method of attaching the circular saw 1 to the rotary shaft 14 will be described. Pass the protrusion 14a through the hole 1a of the circular saw 1,
Further, the protrusion 14a is formed in the hole 20a of the rubber spacer 20.
Pass through. Then, the circular saw 1 is pressed by the pressing plate 22 via the spacer 20, the mounting bolts 24 are inserted from the holes 22a of the pressing plate 22, and are attached to the female screw 10 of the rotary shaft 14. Further tighten the mounting bolts 24 to make a circular saw 1
Is fixed to the rotary shaft 14.

Next, the work of cutting the iron angle W by the cutting device 9 equipped with the circular saw 1 will be described. The iron angle W is installed between the holding member 25 and the holding member 29, the handle 33 is rotated, and the holding member 29 is advanced together with the screw shaft 27. Then, the angle W is held and fixed by the holding member 29 and the holding member 25.

Next, the grip portion 19 is gripped, the switch 21 is turned on, and the motor is operated to rotationally drive the circular saw 1 attached to the rotary shaft 14. Then, the swinging portion 15 is lowered, and the angle W is cut by the circular saw 1. Since the number of cutting blades 5 is set to 40 in the circular saw 1, frictional heat is less generated and cooling is performed smoothly, so that seizure does not occur and moreover, a circular cutting blade having a grindstone-shaped cutting edge is used. The angle W can be cut in a shorter time than a saw.

Since the frictional heat is not generated so much, the material of the angle W does not change, and the cut portion is clean and burrs-free, so that it is not necessary to carry out finishing work with a sander. In addition, almost no iron powder is generated, and the vibration and noise of the circular saw 1 are suppressed by the rubber spacer 20.

Further, the cutting ability of the circular saw having a super hard cutting edge gradually decreases, whereas the cutting ability of the circular saw 1 does not decrease if the cutting edge 5 is slightly protruding. It has excellent characteristics that it can maintain high cutting ability until just before it becomes completely unusable.

A method of manufacturing the circular saw 1 will be described. The circular saw body 2 is manufactured by punching or laser cutting, and then subjected to quenching to improve the strength of the circular saw body 2. When the circular saw body 2 is hardened, distortion occurs, so that the protruding size of the cutting blade 5 from the highest portion 7 of the base metal 3 cannot be controlled with high accuracy. Therefore, as shown in FIG. 4, a plurality of hardened circular saw bodies 2 are stacked and fixed to the rotary shaft 40 of the polishing apparatus.
While contacting the polishing roller 43 attached to the rotary shaft 41, the rotary shaft 40 and the rotary shaft 41 are rotated to polish the circumferential surface of the circular saw body 2. This makes the distance from the center of the circular saw body 2 to the peripheral surface uniform. Therefore the cutting edge 5
It becomes possible to manage the protruding size of the with high accuracy.

The embodiment of the present invention has been described above in detail. However, the specific configuration is not limited to this embodiment, and the present invention can be made even if the design is changed within the scope not departing from the gist of the present invention. Included in the invention. For example, a circular saw with a diameter of 300 mm to 500 mm can be manufactured with an appropriate size, and the number of cutting edges 5 is 30 to 5.
It may be appropriately changed within the range of 0 pieces, and the protruding dimension α of the cutting edge 5
Can be appropriately changed within the range of 0.25 mm to 0.5 mm. Further, the rake angle θ of the cutting edge 5 can be appropriately changed within the range of −3 ° to + 7 °. Further, the circular saw 1 can also be used to cut the iron angle described above, as well as those made of metal such as stainless steel.

[0024]

As described above, according to the present invention, the present invention can be applied to a cutting device equipped with a circular saw having a grindstone-shaped cutting edge, and is compared with the case where a circular saw having a grindstone-shaped cutting edge is used. The material to be cut is not wasted. Further, the frictional heat is less generated, and the change of the material to be cut due to the heat and the seizure of the circular saw can be prevented.

Further, the cutting time can be shortened, and it is not necessary to finish by using a sander without generating burrs. Moreover, the circular saw has high durability. Furthermore, it becomes possible to prevent generation of metal powder such as iron powder during cutting. Further, since the spacer formed of the elastic body is provided, it is possible to prevent vibration and noise from being generated. Further, even if the circular saw body is hardened, the protruding dimension of the cutting edge of the cermet tip can be controlled with high accuracy.

[Brief description of drawings]

FIG. 1 is a plan view of a circular saw according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a perspective view of a cutting device equipped with a circular saw according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a structure for attaching a circular saw according to an embodiment of the present invention to a rotary shaft of a cutting device.

FIG. 5 is a perspective view for explaining a polishing process for manufacturing a circular saw according to an embodiment of the present invention.

[Explanation of symbols]

 1 Circular Saw 1a Circular Saw Hole 2 Circular Saw Main Body 3 Base Metal 5 Cutting Edge 7 Highest Part of Base Metal 9 Cutting Device 10 Female Screw 11 Base 13 Support Shaft 14 Rotating Shaft 14a Rotating Shaft Projection 15 Swinging Part 16 Arm 18 Support Plate 19 Grip 20 Spacer 20a Spacer Hole 21 Switch 22 Holding Plate 22a Holding Plate Hole 23 Cover 24 Mounting Bolts 25, 29 Holding Member 27 Screw Shaft 31 Female Thread Base 33 Handle

Claims (3)

[Claims] 1. A circular saw having a circular saw main body, a base metal formed on the circular saw main body, and a cutting edge constituted by a cermet tip planted in the base metal, and having a diameter of 300.
A circular saw characterized in that the cutting edge has a rake angle of -3 mm to + 7 °, and a protruding dimension of the cutting edge from the base metal is 0.25 mm to 0.5 mm. 2. A main body forming step of forming a circular saw main body, a quenching step of subjecting the circular saw main body to a quenching process, and a peripheral surface of the circular saw main body which has undergone the quenching step, and polishing from the center to the peripheral surface. A method of manufacturing a circular saw, comprising: a polishing step for making the distance uniform; and a cermet tip planting step for implanting a cutting edge constituted by a cermet tip on a base metal of the circular saw body that has undergone the polishing step. 3. A support plate fixed to the rotary shaft by inserting the rotary shaft into a hole of a circular saw in which a cutting edge of a cermet tip is planted, and a holding plate fixed to the rotary shaft. In a method of attaching a circular saw to a cutting device that holds the circular saw and attaches the circular saw to a rotary shaft, a spacer made of an elastic body is interposed between the circular saw and the holding plate. Method of attaching a circular saw to the cutting device.