JP2012206212A - Circular saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circular saw which performs high precision cutting and grooving even if a tool body has a thin-thickness blade.SOLUTION: The circular saw includes a plurality of cutting blades which are composed of high hardness sintered body chips and provided at the outer periphery of the tool body. In the tool body, the thickness of the tip of the high hardness sintered body chip is made thinner than that at the inner peripheral side by using particulate cemented carbide. Since there is no need for making the thickness of the tool body thinner, high precision/high efficiency cutting and grooving are possible even if the blade is thin in thickness.

Description

  The present invention relates to a circular saw in which a plurality of cutting blades made of a high-hardness sintered chip are provided on the outer periphery of a disk-shaped tool body. In particular, the present invention relates to a thin blade circular saw with a thin tool body.

  A cutting tool called a metal saw is known as a conventional tool of this type. (Patent Document 1)

  As another conventional tool of this type, a grinding tool in which a hard metal tool body is coated with polycrystalline diamond synthesized by a CVD method is known. (Patent Document 2)

  As yet another conventional tool of this type, a cutting tool is known in which a tool body is provided with a cutting edge made of polycrystalline diamond. (Patent Document 3)

  As another conventional tool of this type, a thin-blade cutting tool called a metal saw is defined in JIS B4219. This standard stipulates a metal saw having an outer diameter of 32 to 315 mm and a width of 0.3 to 6 mm. (Non-Patent Document 1)

  Further, as another conventional tool of this type, a cutting tool called “super hard circular saw” is defined in JIS B4805. This standard stipulates “Carbide Round Saw” in which a cemented carbide tip mainly used for processing wood is fixed to a tool body. (Non-Patent Document 2)

JP-A-10-263911 Japanese Patent Laid-Open No. 2000-225511 JP 2007-190642 A

“JIS Handbook 1997”, Japanese Standards Association, 1997, P395-399, Metal Saw, B4219 "JIS Handbook 1997", Japanese Standards Association, 1997, P925-928, carbide round saw, B4805

  However, the conventional thin-blade tool sometimes has a problem that cutting and grooving with high accuracy cannot be performed and a problem that the tool life is shortened. This problem was particularly noticeable as the thickness of the tool body decreased.

  The circular saw of the present invention is a circular saw in which a plurality of cutting edges made of a high hardness sintered body chip are provided on the outside of a disk-shaped tool body, and the thickness t of the tool body and the outer diameter D of the circular saw. A circular saw characterized in that the ratio value (t / D) is 0.00025 to 0.05.

Specifically, the high hardness sintered body chip is a circular saw characterized in that it is a diamond sintered body or a CBN sintered body.
As the high-hardness sintered body chip, a diamond sintered body (PCD) mainly composed of diamond or a CBN sintered body (PCBN) mainly composed of CBN can be used. In particular, a diamond sintered body is most suitable for the present invention because it has extremely high wear resistance of several tens of times that of cemented carbide.
Needless to say, cemented carbide, cermet, ceramics and the like can be used as the high-hardness sintered chip in addition to the above materials.

More specifically, the circular saw is characterized in that the material of the tool body (also called a base metal or body) is a cemented carbide.
The material of the tool body is preferably a cemented carbide. More preferably, it is a fine particle cemented carbide containing fine WC.
It goes without saying that cemented carbide, cermet, ceramics and the like can be used as the material of the tool body in addition to the above materials.

  More specifically, the circular saw is characterized in that the thickness t of the tool body is 0.05 mm or more and 1.0 mm or less.

  More specifically, in the circular saw, the outer diameter D of the tool body is 20 mm or more and 200 mm or less.

  More specifically, the high-hardness sintered chip is a circular saw characterized in that it is fixed to the tool body using a low melting point brazing material or a conductive adhesive.

More specifically, in the circular saw, the thickness of the tip portion of the high-hardness sintered chip is formed thinner than the inner peripheral side.
As shown in FIG. 4, it is not necessary to reduce the thickness of the tool body by making the thickness T1 of the tip of the high hardness sintered body chip thinner than the inner peripheral side T2. Therefore, even with a thin blade, cutting and grooving can be performed with high accuracy and high efficiency. In this case, normally, only the portion having the thickness T1 acts on the machining, and the T2 portion is used so as not to act on the machining. In this way, since only the portion where the high-hardness sintered chip acts on the workpiece can be thinned, a thin-blade circular saw can be manufactured without reducing the rigidity of the tool body.

More specifically, various metal materials, wood, plywood, FRP, CFRP, resin, rubber, semi-fired ceramics, green ceramics, or a composite material composed of two or more materials selected from these materials It is a circular saw characterized by being used for cutting.
Here, a ceramic molded body formed by mixing a ceramic raw material powder and a binder is referred to as a green ceramic (also referred to as a green molded body or a generated shape). The green ceramics calcined at a temperature lower than the firing temperature is called semi-fired ceramics. The ceramic material can be applied to various ceramic materials and is not particularly limited.

  By using the circular saw of the present invention, various materials can be cut with high efficiency and high accuracy.

The top view of Example 1 of this invention is shown. The enlarged view of the chip | tip of Example 1 is shown. The enlarged view when the chip | tip of Example 1 is seen from the rake face side is shown. The enlarged view when the chip | tip of another Example is seen from the rake face side is shown.

  The best mode for carrying out the invention will be described in detail in Examples.

The following circular saw of Example 1 of the present invention was manufactured, and the effect of the present invention was confirmed by experiments.
18 diamond sintered body chips (PCD) are brazed to the tool body with a low melting point silver solder, the outer diameter D is 70 mm, the tool body thickness t is 0.25 mm, the blade thickness T is 0.3 mm, A circular saw having a rake angle α in the radial direction of 5 °, a first outer clearance angle β of 10 °, and a cutter angle γ of 75 ° was manufactured. FRP was cut using this circular saw. The processing machine used was a dicing machine, the rotational speed was 15000 / min, the feed rate was 600 mm / min, the cutting depth was 0.5 mm, and wet cutting was performed while supplying pure water. As a result, there was no chip adhesion on the rake face and the flank face, no damage to the blade edge, good surface properties of the work material, and satisfactory results with satisfactory cutting accuracy were obtained.
(Comparative Example 1)

A metal saw made of cemented carbide having the same dimensions as the circular saw of Example 1 was manufactured. The experiment was performed under the same conditions as in Example 1.
As a result, as the experiment was continued, chips were welded to the rake face and flank face, making it impossible to satisfy the required cutting accuracy.

  The present invention is considered to be used for cutting a workpiece such as an electronic material, a semiconductor product, and various substrates with high efficiency and high accuracy.

DESCRIPTION OF SYMBOLS 1 Circular saw 2 High-hardness sintered compact chip 3 Tool body D Outer diameter T Blade thickness T1 Tip thickness T2 Inner circumference thickness t Tool body thickness α Radial rake angle β Outer peripheral first clearance angle γ Tool angle

Claims (8)

A circular saw provided with a plurality of cutting edges made of a high-hardness sintered chip on the outside of a disk-shaped tool body,
A circular saw having a ratio (t / D) of a thickness t of the tool body to an outer diameter D of the circular saw of 0.00025 to 0.05.   The circular saw according to claim 1, wherein the high hardness sintered body chip is a diamond sintered body or a CBN sintered body.   The circular saw according to claim 1 or 2, wherein a material of the tool body is a cemented carbide.   The circular saw according to any one of claims 1 to 3, wherein a thickness t of the tool main body is 0.05 mm or more and 1.0 mm or less.   The circular saw according to any one of claims 1 to 4, wherein an outer diameter D of the tool body is 20 mm or more and 200 mm or less.   6. The high-hardness sintered body chip is fixed to the tool body using a low melting point brazing material or an electrically conductive adhesive, or the like. Circular saw according to item.   The circular saw according to any one of claims 1 to 6, wherein a thickness of a tip portion of the high-hardness sintered chip is formed thinner than an inner peripheral side.   Used for cutting various metal materials, wood, plywood, FRP, CFRP, resin, rubber, semi-fired ceramics, green ceramics, or composite materials composed of two or more materials selected from these The circular saw according to any one of claims 1 to 7, characterized in that:

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