JP3012075U - Circular saw - Google Patents

Abstract

(57) [Abstract] [Purpose] It can be applied to a cutting device equipped with a conventional circular saw having a grindstone-shaped cutting edge, there is no waste of material, less frictional heat is generated, and the material to be cut changes depending on the heat. (EN) Provided is a circular saw which does not cause abrasion, does not cause seizure, has a short cutting time, has no burr, and has high durability. [Structure] A base metal 3 is attached to the outer periphery of the circular saw body 2 of the circular saw 1.
It is formed at 0 places. Cermet chips 5 as cutting blades are planted in the base metal 3, respectively. The protrusion size of the tip 5 from the highest portion 7 of the base metal 3 is set to 0.4 mm.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a circular saw using a cermet tip as a cutting blade.

[0002]

[Prior art]

 When cutting angles made of metal such as iron or stainless steel, circular saws with grindstone-shaped cutting blades are used. This circular saw was mounted on a cutting device and was installed at 3800r. p. m. It can be rotated in moderation. A cutting device that uses a circular saw with a grindstone-shaped cutting edge does not require a reducer because the rotation speed of the circular saw and the rotation speed of the motor used are almost the same, and the cutting device is simple. It has the characteristic of being inexpensive.

[0003]

[Problems to be solved by the device]

 However, if a circular saw with a grindstone-shaped cutting edge is used, the material to be cut is scraped off and cut, so not only is the material wasted, but the cut portion becomes hot due to frictional heat and becomes hardened. There is a problem that changes. In addition, since it takes a long time to cut, workability is poor, and burrs are formed on the cut portion, so there is a problem that work is required to remove the burrs. Furthermore, the circular saw has low durability, and there is a problem that the cutting ability is immediately deteriorated.

Conventionally, there is a circular saw using a cermet tip for the cutting edge, but these are all 1400 r.p.m. p. m. The number of chips used is about 70, and the number of chips is about 70. This is 3800 r. p. m. If it is used at a rotation speed of around 3, the cutting edge will be clogged and burned out, and a circular saw using a cermet tip will be 3800 r. p. m. It was said that it could not be used at a moderate number of rotations.

The present invention has been made in view of the above-mentioned conventional problems, and can be applied to a cutting device equipped with a circular saw having a grindstone-shaped cutting blade in the related art. It provides a circular saw with a high durability that is less likely to change, 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. The purpose is to

[0006]

[Means for Solving the Problems]

 The invention of claim 1 is 2800 r. p. m. To 4800 r. p. m. In the circular saw used at the above rotational speed, 30 to 50 cermet chips as cutting edges are planted at equal intervals.

According to a second aspect of the present invention, in the first aspect, the protruding dimension of the cutting edge is 0.2 mm to 0.1 mm. The circular saw is 6 mm.

[0008]

[Action]

 In the invention of claim 1, since the number of the cermet chips as the cutting blades is 30 to 50, it is 2800 r.p.m. p. m. To 4800 r. p. m. Even if it is used at the number of rotations, it does not cause clogging, and it prevents the occurrence of image sticking.

Further, according to the second aspect of the present invention, even if the protruding dimension of the cutting edge is changed from 0.2 mm to 0.6 mm, it is 2800 r.p.m. p. m. To 4800 r. p. m. Since it is used at the number of rotations of, the time for applying force to each cutting edge is short, and there is no risk of damage.

[0010]

【Example】

 A circular saw 1 according to an embodiment of the present invention will be described with reference to the drawings. The circular saw 1 has a straight diameter of 305 mm, 355 mm and 405 mm. On the outer periphery of the circular saw body 2 of the circular saw 1, base metals 3 are formed at 40 places. Cermet chips 5 as cutting blades are planted in the base metal 3, respectively. The protrusion size α of the tip 5 from the highest portion 7 of the base metal 3 is set to 0.4 mm.

A cutting device 9 is shown in FIG. 3, and this cutting device 9 is used by attaching a circular saw having a grindstone-shaped cutting blade. 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, and 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 oscillating 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. Further, 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 denotes a cover, which covers almost half of the circular saw 1.

The base 11 is provided with a holding member 25, 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 through the female screw base 31, and a handle 33 is attached to the base end of the screw shaft 27.

Next, the work of cutting the iron angle W by the cutting device 9 equipped with the circular saw 1 will be described. An iron angle W is installed between the holding member 25 and the holding member 29, the handle 33 is turned, 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 cermet chips 5 is set to 40 on the circular saw 1, frictional heat is less generated and cooling is performed smoothly, so no seizure occurs and only a whetstone-shaped cutting edge It is possible to cut the angle W in a shorter time than a circular saw having.

Since the frictional heat is less generated, the material of the angle W does not change, and the cut portion is clean and burr-free, so that it is not necessary to perform the finishing process with the sander. The circular saw 1 has higher durability than a circular saw having a grindstone-shaped cutting edge, as well as a circular saw having a super hard cutting edge. For example, when cutting an iron wrench with a thickness of 6 mm and a width of 65 mm, only 120 circular saws with carbide blades can cut this angle, whereas circular saw 1 It is possible to cut about 1000 angles.

Further, the cutting ability of the circular saw having a super hard cutting edge gradually decreases, whereas the circular saw 1 does not have the cutting ability of the circular saw 1 even if the tip 5 is slightly protruded, and thus the circular saw 1 has a perfect cutting ability. It has excellent characteristics that it can maintain high cutting ability until just before it becomes unusable.

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and the present invention can be made even if there is a design change within the scope not departing from the gist of the present invention. Included in the device. For example, the number of chips 5 may be appropriately changed within the range of 30 to 50, and the protrusion size α may be appropriately changed within the range of 0.2 mm to 0.6 mm. Further, the circular saw 1 can be used to cut the iron angle mentioned above and also those made of metal such as stainless steel.

[0019]

[Effect of device]

 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 should be cut in comparison with the case where a circular saw having a grindstone-shaped cutting edge is used. No more wasting material. Furthermore, frictional heat is less likely to be generated, and it is possible to prevent changes due to heat in the material to be cut and seizure of the circular saw. Also, the cutting time can be shortened, and there is no need to finish with a sander without the occurrence of burrs. Moreover, the circular saw has high durability.

[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.

[Explanation of symbols]

 1 circular saw 2 circular saw body 3 base metal 5 cermet tip 7 highest part of base metal 9 cutting device 11 base 13 support shaft 14 rotary shaft 15 swinging part 16 arm 19 gripping part 21 switch 23 cover 25, 29 Holding member 27 Screw shaft 31 Female screw base 33 Handle

Claims (2)

[Scope of utility model registration request] 1. A 2800 r. p. m. To 4800 r.
p. m. In the circular saw used at the number of revolutions, 30 to 50 cermet chips as cutting blades are planted at equal intervals. 2. A cutting edge according to claim 1, wherein the protruding dimension of the cutting edge is 0.
A circular saw having a length of 2 mm to 0.6 mm.