JP2011224840A - Rotary saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary saw that suppresses an increase of a cutting resistance, and improves the efficiency of cutting and safety by restraining cutting chips from intruding into a tooth chamber, and efficiently discharging the cutting chips intruding into the tooth chamber.SOLUTION: The rotary saw has: blade bases in an outer circumference of disk-like body at predetermined pitches; tips at outer circumference corners of the blade bases in their rotation direction. The blade bases have a substantially rectangular shape, the height of outer circumference corners of outer circumference side of the blade base in the non-rotation direction is lower than that of the tips, and the tooth bottoms of tooth chambers between the blade bases are substantially linear.

Description

  The present invention relates to a rotary saw that cuts wood, wood, or the like.

  Conventionally, in a rotary saw, when the rotary saw rotates with the chips remaining in the tooth chamber, the cutting resistance increases due to the chips, and frictional heat is generated in the rotary saw, scoring the cut surface. The material being cut ignited.

  As a method for suppressing the increase in cutting resistance, for example, a device as disclosed in Patent Document 1 has been devised. In the rotary saw of patent document 1, the thickness of the edge of the recessed part of a dental chamber is made thicker than a base metal, so that chips are efficiently discharged from the recessed part to the outside.

JP 2007-118149 A

  However, in the conventional rotary saw, the cutting resistance of the rotary saw itself may increase by making the edge of the concave portion of the tooth chamber thicker than the base metal, and the cutting resistance is sufficiently suppressed. I can't.

  The present invention has been made in view of such circumstances, and it is possible to prevent cutting chips from entering the dental chamber and efficiently discharge cutting chips that have entered the dental chamber from the dental chamber, thereby increasing cutting resistance. An object of the present invention is to provide a rotary saw that can suppress cutting and improve cutting efficiency and safety.

  In the rotary saw according to claim 1, the blade base has a substantially rectangular shape, the height of the outer peripheral corner portion in the non-rotating direction around the outer periphery of the blade base is lower than the height of the tip, and the root of the tooth chamber between the blade bases is The shape is substantially linear.

  The rotary saw according to claim 2 is characterized in that the root of the tooth is substantially perpendicular to the direction in which the centrifugal force due to rotation is applied.

  The rotary saw according to claim 3 is characterized in that the outer periphery of the blade base is substantially V-shaped, and the rake angle of the outer peripheral corner in the non-rotating direction is 10 ° to 35 °.

  The rotary saw according to claim 4 is characterized in that the rake angle of the root of the tooth space between the blades is set to 25 ° to 35 °.

  According to the invention of the present application, it is possible to prevent chips from entering the tooth space at the outer peripheral corners in the non-rotating direction around the outer edge of the blade base, and the tooth bottom of the tooth space between the blade bases is substantially linear and rotated. The cutting efficiency and safety can be improved by efficiently discharging the chips that have entered the tooth space from the tooth space by being substantially perpendicular to the direction in which the centrifugal force is applied, and suppressing the increase in cutting resistance.

1 is an external view of a rotary saw according to a first embodiment of the present invention. It is explanatory drawing of the rotary saw of the 1st Example. It is an external view of the rotary saw of 2nd Example which concerns on this invention. It is explanatory drawing of the rotary saw of the 2nd Example.

  The rotary saw in the embodiment of the present invention has a blade base at a predetermined pitch on the outer periphery of a disk-shaped main body for cutting wood, wood material, etc., and a chip at an outer peripheral corner in the rotation direction of the blade base. is there.

  FIG. 1 is an external view of a rotary saw according to a first embodiment of the present invention. FIG. 2 is an explanatory diagram of the rotary saw according to the first embodiment.

  The rotary saw 1 in the first embodiment is a circular saw with φ305 and 30 teeth. In the rotary saw 1, 30 substantially rectangular blade bases 20 are provided on the outer periphery of the disk-shaped main body 10, and a substantially rectangular concave tooth chamber 26 is formed between the blade base 20 and the blade base 20. Yes. In the tooth chamber 26, the opening side (the outer peripheral side of the main body 10) faces the rotation direction of the rotary saw 1. A cutting tip 22 is provided at the outer peripheral corner 24 a in the rotational direction of the outer periphery 24 of the blade base 20.

  The outer periphery 24 of the blade base 20 has a substantially V shape in which an outer peripheral corner portion 24 a and an outer peripheral corner portion 24 b protrude in the outer peripheral direction, and the height of the outer peripheral corner portion 24 b in the non-rotating direction of the outer periphery 24 is the tip 22. It is set lower than the height. The difference in height between the tip 22 and the outer peripheral corner 24b is preferably about 1.5 mm to about 3.0 mm in the case of a circular saw having 10 to 80 teeth and φ150 to φ160, and the rotary saw 1 of this embodiment. Then, it is about 2.0 mm. The rake angle α, which is an angle formed by the outer peripheral corner portion 24b and the circumferential direction, is preferably 10 ° to 35 °, and is about 13 ° in the rotary saw 1 of the present embodiment.

  The tooth bottom of the tooth chamber 26 is substantially straight and is inclined in the rotational direction, and is preferably substantially perpendicular to the direction in which the centrifugal force is applied due to the rotation, and the rake angle γ, which is the angle formed with the circumferential direction, is , 25 ° to 35 °, and is about 33 ° in the rotary saw 1 of this embodiment.

  The rotary saw 1 of the first embodiment is a so-called circular saw having a large number of teeth, but a so-called cutter having a small number of teeth is the rotary saw 2 of the second embodiment. FIG. 3 is an external view of a rotary saw according to a second embodiment of the present invention. FIG. 4 is an explanatory diagram of the rotary saw according to the second embodiment.

  The rotary saw 2 in the second embodiment is a cutter with φ255 and 12 teeth. The rotary saw 2 is provided with twelve substantially rectangular blade bases 40 on the outer periphery of a disk-shaped main body 30, and a substantially rectangular concave tooth chamber 46 is formed between the blade bases 40 and 40. Yes. In the tooth chamber 46, the opening side (the outer peripheral side of the main body 30) faces the rotation direction of the rotary saw 2. A cutting tip 42 is provided at the outer peripheral corner 44 a in the rotation direction of the outer periphery 44 of the blade base 40.

  The outer periphery 44 of the blade base 40 is substantially V-shaped with the outer peripheral corner portion 44 a and the outer peripheral corner portion 44 b protruding in the outer peripheral direction, and the height of the outer peripheral corner portion 44 b in the non-rotating direction of the outer peripheral portion 44 is the tip 42. It is set lower than the height. The difference in height between the tip 42 and the outer peripheral corner 24b is preferably about 2.0 mm to about 5.0 mm in the case of a cutter having 4 to 30 teeth and φ100 to φ305. In the rotary saw 2 of this embodiment, About 3.5 mm. The rake angle α, which is an angle formed between the outer peripheral corner portion 44b and the circumferential direction, is preferably 10 ° to 35 °, and is about 30 ° in the rotary saw 2 of the present embodiment.

  The tooth bottom of the tooth chamber 46 is substantially linear and is inclined in the rotational direction, and is preferably substantially perpendicular to the direction in which centrifugal force is applied due to the rotation, and the rake angle γ, which is an angle formed with the circumferential direction, is 25 ° to 35 °, and is about 32 ° in the rotary saw 2 of this embodiment.

  As described above, according to the rotary saws 1 and 2 of the present embodiment, the outer peripheral corners 24b and 44b of the outer periphery 24 and 44 of the blade bases 10 and 40 in the non-rotating direction are the tooth chamber 26 at the rear in the rotating direction. , 46 is suppressed, and the tooth bases 28, 48 of the tooth chambers 26, 46 between the blade bases 20, 40 are substantially straight, so that the chips that have entered the tooth chambers 26, 46 are obtained. Can be efficiently discharged from the tooth chambers 26 and 46, and an increase in cutting resistance can be suppressed and cutting efficiency and safety can be improved.

  The rotary saws 1 and 2 according to the present embodiment are examples, and the radius and the number of teeth can be set in various ways.

  As described above, according to the present invention, it is possible to suppress cutting chips from entering the tooth space and efficiently discharge the chips that have entered the tooth space from the tooth space, thereby suppressing an increase in cutting resistance and cutting efficiency. A rotary saw capable of improving safety can be provided.

DESCRIPTION OF SYMBOLS 1 ... Rotary saw 2 ... Rotary saw 10 ... Main body 12 ... Shaft hole 20 ... Blade 22 ... Tip 24 ... Outer periphery 24a ... outer peripheral corner 24b ... outer peripheral corner 26 · · · tooth chamber 28 · · · tooth base 30 · · · body 32 · · · shaft hole 40 · · · blade base 42 · · · .... Tip 44 ... Outer periphery 44a ... Outer periphery corner 44b ... Outer periphery corner 46 ...... Tooth chamber 48 ...... Tooth base

Claims (4)

In a rotary saw having a blade base at a predetermined pitch on the outer periphery of a disk-shaped main body, and a tip at the outer peripheral corner of the rotational direction of the blade base,
The blade base is substantially rectangular, and the height of the outer peripheral corner in the non-rotating direction around the outer periphery of the blade base is lower than the height of the tip,
A rotary saw characterized in that the root of the tooth chamber between the blade bases is substantially linear.   The rotary saw according to claim 1, wherein the tooth bottom is substantially perpendicular to a direction in which centrifugal force due to rotation is applied.   The rotary saw according to claim 1 or 2, wherein an outer periphery of the blade base is substantially V-shaped, and a rake angle of an outer peripheral corner portion in the non-rotating direction is set to 10 ° to 35 °.   The rotary saw according to any one of claims 1 to 3, wherein a rake angle of a tooth bottom of a tooth chamber between the blade rests is set to 25 ° to 35 °.

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