JP2011067903A - Rotary saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a rotary saw reducing cutting resistance when cutting a workpiece. <P>SOLUTION: A tip (10) formed at a narrow width portion (12), whose base side becomes substantially the same as the thickness of a base metal (2), is disposed at a wide width portion (11), whose front end side becomes larger than the thickness of the base metal (2). Blade bases (3) are projectedly formed at predetermined pitches along the outer periphery of the disk-shaped base metal (2). The tip (10) is brazed on a rotation progressive surface portion of each of the blade bases (3). The surface of the base metal (2) and the side surface of the narrow width portion (12) are coated with a film material (13) being rich in slippage and wear resistance. Further, a basal end wide width portion (11-1) corresponding to the extension line of the wide width portion (11) is disposed at the basal end of the narrow width portion (12) of the tip (10). The side surface of the narrow width portion (12) except for the basal end wide width portion (11-1) is coated with the film material (13) rich in slippage and wear resistance. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a rotary saw for cutting steel, wood, lightweight cellular concrete (ALC), wood cement and the like.

  There existed patent document 1 as a prior art. That is, a disk-shaped diamond sintered substrate was cut out by a wire-cut electric discharge machine, and the tip side was formed in a wide part wider than the thickness of the base metal, and the base side was formed in a narrow pattern part substantially equal to the thickness of the base metal. A blade-shaped diamond sintered chip is provided, and a stepped chip seat is formed in the rotation progression surface portion of each of the blade bases protruding at a predetermined pitch on the outer periphery of the disk-shaped base metal. There was a diamond tip saw made by brazing a diamond sintered tip.

  The patent document 1 prevents the chip from peeling from the base metal by increasing the brazing area with the base metal while reducing the cutting resistance by reducing the cutting edge on the tip side of the diamond sintered chip. Can do. However, since the handle portion of the diamond sintered tip is substantially equal to the thickness of the base metal, when cutting the cutting material, chips adhere to the side surface of the handle portion, and the cutting resistance increases.

Japanese Patent Laid-Open No. 10-309626

  The present invention provides a novel rotary saw that reduces the cutting resistance by preventing chips from adhering to the small width portion while making the base side of the chip fixed to the base metal a small width portion substantially equal to the thickness of the base metal. The purpose is to obtain.

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 provides a disk-shaped base metal by providing a chip formed at a wide width part where the tip side is larger than the thickness of the base metal and a base part side having a small width part substantially equal to the thickness of the base metal. A blade is formed on the outer periphery of the blade at a predetermined pitch, the tip is brazed to the rotation progress surface portion of each blade, and the surface of the base metal and the side surface of the small width portion are highly lubricated and wear-resistant. It is the structure which coat | covers by.
According to the second aspect of the present invention, a base end wide portion that matches an extension line of the wide width portion is provided at the base end portion of the small width portion of the chip, and the side surface of the small width portion excluding the base end wide width portion is made slippery and abrasion resistant. It is configured to be coated with a film material rich in wear.
The invention according to claim 3 is configured such that the stepped portion of the wide portion and the narrow portion of the chip extends in a substantially tangential direction of the base metal.

In the invention according to claim 1 of the present invention, since the wide portion provided on the tip end side cuts the cutting material, the cutting resistance is reduced. In addition, since the side surface of the small width portion provided on the tip base side is covered with a film material rich in lubricity and wear resistance, chips do not adhere to this portion and the cutting resistance is not increased. .
In the invention according to claim 2, since the base end wide portion that matches the extension line of the wide portion is provided at the base end portion of the small width portion, the measurement point of the chip width is between the tip end portion and the base end portion of the chip. When the left and right side surfaces of the chip are ground to form a side center angle that tapers from the tip to the base end, the side center angle can be measured with high accuracy. it can. In addition, since the side surfaces of the small width portion excluding the base end wide width portion are covered with a film material rich in lubricity and wear resistance, chips do not adhere to this portion and the cutting resistance is not increased.
In the invention according to claim 3, since the step portion of the wide portion and the narrow portion of the chip is extended in the substantially tangential direction of the base metal, the chips pass through the step portion smoothly.

It is a partial side view which shows 1st Example of this invention. It is an expanded sectional view by the II-II line of FIG. FIG. 2 is a P view of FIG. 1. It is a partial side view which shows 2nd Example of this invention. It is an expanded sectional view by the VV line of FIG. It is a partial side view which shows 3rd Example of this invention.

  1 to 3, 1 is a rotary saw and 2 is a base metal. The base metal 2 is formed of carbon tool steel (JIS standard; SK5, SK6). In this example, the base metal 2 is formed in a disk shape having an outer diameter of about 165 mm and a thickness T3 of about 1.0 mm. 52 blade bases 3 are formed at equal or non-uniform pitches in the circumferential direction, and arc-shaped concave parts 4 are formed between the respective blade bases 3 inward in the radial direction. A stepped chip seat 5 is formed on the traveling surface side, and the chip 10 is brazed to the chip seat 5.

  In this example, the chip 10 is made of a cemented carbide that is cold-molded and sintered-molded by a mold. As shown in FIG. 1, the tip 10 has a base portion on a wide-width portion 11 whose tip side is larger than the thickness of the base metal 2. The side is formed in a small width portion 12 that is substantially equal to the thickness of the base metal 2 via a step portion 12b, and the leading edge 11a of each wide width portion 11 has a left and right width T1 of about 1.45 mm, and in the circumferential direction. The tip inclination angle D after polishing of the adjacent tip cutting edge 11a is set to about 10 degrees opposite to each other, and the side face angle E of the side cutting edge 11b is set to about 1.0 degree. The small width portion 12 has the left and right side surfaces 12a parallel to each other, and the width T2 of the left and right side surfaces 12a is about 1.1 mm.

  After the tip 10 is brazed to the tip seat 5 of each blade base 3, the rake face 10a, the flank face 10b, and the side face 11c of the wide width portion 11 are polished, and the tip inclination angle D and the side face centration angle described above are polished. As shown in FIG. 1, the rake angle A is about 20 degrees, the clearance angle C is about 15 degrees, and the rake angle B of the rake face 10a is about 12 degrees as shown in FIG. The side clearance angle S of the side surface 11c of the part 11 is set to about 2 degrees. In addition, each angle and dimension of the said chip | tip 10 are suitably set with the kind of cutting material. Further, after the chip 10 is brazed to the base metal 2 and polished, as shown in FIG. 2, the left and right surfaces of the base metal 2 and the left and right side surfaces 12a of the narrow portion 12 of the chip 10 are lubricated and wear-resistant. It coat | covers with the film | membrane material 13 rich in property, and it prevents a chip | tip from adhering to these parts. In this example, the film material 13 is a fluororesin-based mixture of PTFE (fluororesin) 20 to 50 percent and other resins 50 to 80 percent. The film material 13 may be molybdenum disulfide or graphite.

  4 and 5 show a second embodiment. In this example, a base end wide portion 11-1 that matches an extension line of the side surface 11 c of the wide width portion 11 is formed at the base end portion of the small width portion of the chip 10. This can measure the side-facing angle E of the wide portion 11 at two points, that is, the tip end portion and the base end portion of the tip 10, so that the height of the wide portion 11 is minimized and the side cutting edge is cut. It is possible to measure the side-facing angle E of the side cutting edge 11b obtained by polishing with high accuracy while reducing the cutting resistance due to 11b.

  Further, after the chip 10 was brazed to the base metal 2 and polished, the left and right surfaces of the base metal 2 and the left and right side surfaces 12a of the narrow portion 12-1 of the chip 10 were baked as shown in FIG. It coat | covers with the film | membrane materials 13 and 13a of a fluororesin-type mixture, and it prevents a chip from adhering to these parts. The other structure is substantially the same as that of the first embodiment.

  FIG. 6 shows a third embodiment. This is because the step portion 12b of the wide width portion 11 and the small width portion 12 of the chip 10 and the step portion 12c of the small width portion 12 and the base end wide width portion 11-1 are tangential to the base metal 2, that is, the base metal 2 This is formed by extending in a direction perpendicular to the diameter line M of the steel sheet, so that the chips smoothly pass through the stepped portions 12b and 12c. The other structure is substantially the same as that of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Rotary saw 2 Base metal 3 Blade base 4 Recessed part 5 Tip seat 10 Tip 10a Rake face 10b Relief face 11 Wide part 11a End cutting edge 11b Side cutting edge 11c Side face 11-1 Base wide part 12 (12-1) Small part 12a Side surface 12b, 12c Step 13 (13a) Film material T1 Wide width left and right width T2 Small width left and right width T3 Base metal thickness

Claims (3)

  A tip formed on a wide part where the tip side is larger than the thickness of the base metal, and a chip formed on a narrow part where the base side is approximately equal to the thickness of the base metal is provided, and the blade base protrudes at a predetermined pitch on the outer periphery of the disk-shaped base metal A rotary saw characterized in that the tip is brazed to the rotation advancement surface portion of each blade base, and the surface of the base metal and the side surface of the small width portion are covered with a film material rich in lubricity and wear resistance. .   A base wide portion that matches the extended line of the wide portion is provided at the base end of the small width portion of the chip, and the side surface of the small width portion excluding the base wide portion is made of a film material that is rich in lubricity and wear resistance. The rotary saw according to claim 1, wherein the rotary saw is coated.   The rotary saw according to claim 1 or 2, wherein the step part of the wide part and the narrow part of the chip is extended in a substantially tangential direction of the base metal.

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