JP2007118149A - Chip discharging device for rotary saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a chip discharging device for a rotary saw that allows chips to be efficiently discharged to the outside from a recessed part by making the thickness at the edge part of the recessed part thicker than that of a base metal. <P>SOLUTION: A large number of blade bases (12) are circumferentially provided on the outer periphery of the disk-like base metal (11) at prescribed pitches. The recessed part (13) recessed in the center direction of the base metal (11) is provided between respective blade bases (12). A tip blade (15) is provided to the respective blade bases (12). A projecting part (14) projecting to the side against a reference face (11a) of the base metal (11) is provided at the edge part of the recessed part (13). The projecting part (14) has a projection amount of being located on an approximate extension line of the side face of a base part (15a) of the tip blade (15) so that the end part opposite to the rotation side of the projecting part (14) is brought into contact with the base part (15a) of the tip blade (15). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a cutting saw discharging device for a rotary saw that cuts new building materials such as ALC (lightweight aerated concrete) and wood cement, or wood and metal materials.

As shown in FIG. 5, the conventional rotary saw has a large number of blade bases 2 formed on the outer periphery of the base metal 1, and a recess (tooth base) 3 that is recessed in the center direction of the base metal 1 between the blade bases 2. The tip blade 4 which is formed and thicker than the thickness of the blade base 2 is fixed to the rotating surface side of the blade base 2.

In the conventional rotary saw, since the thickness of the inner surface of the recess 3 is thinner than the chip blade 4, the function of discharging the chips cut by the chip blade to the outside is poor, and some chips are a base metal. 1 and the work material. For this reason, cutting resistance is increased, and frictional heat generated in the rotary saw is increased. In particular, when cutting a new building material, the chips are fragmented, and even if a dust collector is provided on the rotary saw, it is difficult to collect the chips, which may cause pollution.
JP 2004-351578 A

It is an object of the present invention to provide a novel rotary saw chip discharging device in which chips are efficiently discharged from the recess to the outside by making the edge of the recess thicker than the base metal. And

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is provided with a large number of blades at a predetermined pitch in the circumferential direction on the outer periphery of the disk-shaped base metal, and a recess recessed in the central direction of the base metal between each blade base, Each blade base is provided with a tip blade, and a protrusion projecting laterally with respect to the reference surface of the base metal is provided at the edge of the recess, and the protrusion is substantially on the extension line of the base side surface of the chip blade. The protruding amount is positioned, and the end of the protruding portion on the non-rotating side is in contact with the base of the tip blade.
Moreover, the invention which concerns on Claim 2 forms the said protrusion part by plastically deforming the surface part of a recessed part.

In the invention according to claim 1 of the present invention, since the thickness of the inner surface of the concave portion formed between the chip blades is expanded by the edge portion, the concave portion has a higher chip capturing function in the groove. The chips in the recess are efficiently discharged to the outside. In addition, since the protrusion provided on the edge of the recess is located on a substantially extended line of the base side surface of the tip blade, the contact force (friction) with the side surface of the groove of the work material is small, and the frictional heat is reduced. The increase will be avoided.
In the invention according to claim 2, since the projection is formed by plastically deforming the surface portion of the recess, the projection can be easily formed.

Embodiments of the present invention will be described below with reference to the drawings. 1 is a partial side view showing a first embodiment of the present invention, FIG. 2 is an enlarged side view of the main part of FIG. 1, FIG. 3 is an enlarged sectional view taken along line III-III of FIG. 2, and FIG. It is a fragmentary perspective view which shows 2nd Example of this.

1-3, 10 is a rotary saw and 11 is the metal base. The base 11 is formed of a steel plate. In this example, the base 11 is formed in a disc shape having an outer diameter of about 125 mm and a thickness T2 of about 1 mm, and 22 saw tooth-shaped tooth bases 12 are provided on the outer periphery. The chip blades 15 made of cemented carbide are brazed and fixed to the rotating surface side of each blade base 12.

An arcuate recess 13 that is recessed inward in the radial direction is formed between the respective blade bases 12, and a protrusion 14 that protrudes outward with respect to the reference surface 11 a of the base metal 11 is formed at the edge of the recess 13. As shown in FIGS. 1 and 2, the protruding portion 14 is formed in an arc shape along the inner surface of the concave portion 13, and the protruding amount of the protruding portion 14 is substantially extended from the side surface of the base portion 15 a of the tip blade 15. The projecting amount is located on the line, and the end portion on the counter-rotating side (right end portion in FIG. 2) of the projecting portion 14 is brought into contact with the base portion 15a of the tip blade 15.

After forming the concave portion 13, the protruding portion 14 is subjected to pressure processing (roll processing) in the inner peripheral direction of the base metal 11 to plastically deform the inner peripheral portion of the concave portion 13 to be plastically deformed. The thick portion is polished so as to be flush with the side surface of the base portion 15a of the tip blade 15. Then, after forming the protruding portion 14 by polishing, the tip blade 15 is brazed and fixed to the blade base 12, and the side surface of the tip blade 15 is polished to a specified dimension. In this case, as shown in FIG. 2, the protrusion 14 has a depth P <b> 2 from the base 15 a of the tip blade 15 that is approximately one half or more of the depth P <b> 1 of the recess 13. The thick wall portion may be polished at the same time as the side surface of the tip blade 15 is polished after the tip blade 15 is fixed to the blade base 12.

Further, as shown by the solid line in FIG. 3, the protruding portion 14 may have a uniform thickness from the base portion 15a of the tip blade 15 toward the center of the base metal 11, or two in FIG. As indicated by the dotted line, the thickness may be sequentially reduced from the base portion 15a of the tip blade 15 toward the center of the base metal 11 at the same angle as the side-facing angle E of the tip blade 15.

2, the rake angle A of the rake face 15b and the rake angle C of the flank face 15c are both about 15 degrees, and the side rake angle of the rake face 15b of the adjacent insert blade 15 (see FIG. 2). The tip inclination angle D (FIG. 3) of the tip cutting edge 15d is opposite to each other, and the side rake angle and the tip inclination angle D are both about 10 degrees. In addition, the side-facing angle E of each tip blade 15 is about 1.5 degrees, and the blade thickness T1 of each tip blade 15 is about 1.6 mm.

According to the embodiment, since the thickness of the inner surface of the recess 13 formed between the chip blades 15 is expanded by the edge, the recess 13 has a function of trapping chips in the groove of the work material. Becomes higher. For this reason, when the work material is cut, chips that have arrived in the recess 13 are smoothly captured by the inner surface of the recess and are efficiently discharged to the outside. For this reason, when a dust collector is attached to the rotary saw, when cutting a new building material such as ALC (lightweight cellular concrete) or wood cement that is likely to generate dust, the chips are smoothly discharged from the groove and collected by the dust collector. Increases efficiency.

Further, the side surface of the protruding portion 14 provided at the edge of the concave portion 13 is substantially the same surface as the side surface of the base portion 15a that is thinner than the tip cutting edge 15d of the tip blade 15, so that the protruding portion 14 The contact force (friction) with the side surface of the groove is small, and an increase in frictional heat is avoided.

FIG. 4 shows a second embodiment. This is because when the base metal 11 is manufactured, the thickness of the blade base 12-1 to which the tip blade 15 is fixed is made equal to the thickness of the base portion 15 a of the tip blade 15 from the reference thickness of the base metal 11. When the tip blade 15 is fixed to the blade base 12-1, the side surface of the recess 13a connected to the base portion of the tip blade 15 becomes the same protruding portion 14 as the side surface of the base portion 15a of the tip blade 15. It is a thing. When the thickness of the blade base 12-1 is slightly thicker than the thickness of the base portion 15a of the tip blade 15, and the side surface of the tip blade 15 fixed to the blade base 12-1 is polished, it continues to the recess 13. You may make it grind the side surface of the blade base 12-1 simultaneously, and may form the protrusion part 14 in this part.

According to the said 2nd Example, since the roll process of the edge part of the recessed part 13 becomes unnecessary, the protrusion part 14 can be obtained easily.

It is a partial side view which shows 1st Example of this invention. It is a principal part enlarged side view of FIG. It is an expanded sectional view by III-III of FIG. It is a fragmentary perspective view which shows 2nd Example of this invention. It is a fragmentary perspective view which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotating saw chip discharging apparatus 11 Base 11a Reference surface 12 Blade base 13 Recess 14 Protrusion 15 Tip blade 15a Base 15b Rake face 15c Relief face 15d Tip cutting edge

Claims (2)

On the outer periphery of the disk-shaped base metal (11), a large number of blade bases (12) are provided at a predetermined pitch in the circumferential direction, and recessed portions (13) recessed between the respective blade bases (12) in the center direction of the base metal (11). ), A tip blade (15) is provided on each of the blade bases (12), and a protrusion protruding laterally with respect to a reference surface (11a) of the base metal (11) at an edge of the recess (13) The protrusion (14) is provided with a protruding amount located on a substantially extended line of the side surface of the base (15a) of the tip blade (15), and the end on the counter-rotation side of the protrusion (14) is provided. A scrap saw discharging device for a rotary saw, wherein the tip is brought into contact with the base (15a) of the tip blade (15). 2. A rotary saw chip discharging apparatus according to claim 1, wherein the projecting portion is formed by plastic deformation of the surface portion of the concave portion.

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