JP2009297852A - Tip saw with abrasive particle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tip saw having the composite cutting function of a tip comprising a cemented carbide and a cermet and abrasive grains. <P>SOLUTION: In this tip saw 1, saw blades 3 are formed on a base 2 made of a tool steel or an alloy tool steel circumferentially at predetermined intervals, and tips 5 made of a cemented carbide or a cermet are brazed to blade bases 4 formed on one sides of the saw blades 3. Abrasive grains 8 are adhered to at least both surfaces thereof at the portions of the saw blades 3 including the tips 5. When a workpiece is cut, the composite cutting is performed by the tips 5 and the abrasive grains 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tip saw in which abrasive grains are attached to outer peripheral portions on both sides.

  In general, a tip saw is formed by forming saw teeth at regular intervals around the outer periphery of a base metal made of tool steel or alloy tool steel, and brazing a chip made of cemented carbide or cermet on the tooth base of each saw tooth. .

  The tip saw has a basic problem of low wear and maintaining excellent cutting characteristics over a long period of time. In order to solve this problem, various improvements in base metal and tip materials and structures have been made. However, since the basic configuration of the tip saw itself does not change, the fact is that a significant improvement in cutting performance cannot be expected.

On the other hand, in addition to the above-mentioned tip saw, a cutting grindstone is also used for cutting the member, and in the field of the tip saw, one using a grindstone is also known. Specifically, saw teeth are formed at regular intervals on the outer periphery of the base metal, and these saw teeth are alternately provided with brazed cemented carbide chips and abrasive grains attached, and cutting with chips. And a method in which cutting with abrasive grains is used in combination. In addition, a substantially ring-shaped support abrasive layer formed integrally with saw teeth is provided on the outer periphery of the disk-shaped base metal, and a segment chip made of abrasive grains is attached to the saw teeth in the support abrasive layer. Some are known.
JP-A-5-285722 JP 2001-277137 A

  Of the above-described tip saws using abrasive grains, in the former tip saw in which tips and abrasive grains are alternately attached to the saw blade, cutting of the members by the chips and cutting of the members by the abrasive grains are alternately performed during the rotation. Become. On the other hand, in the case of the latter chip saw in which segment chips made of abrasive grains are attached to saw blades also made of abrasive grains, the segment chips are cut by the abrasive grains when rotating.

  Therefore, in any of the above-described tip saws, since the abrasive grains only have a cutting function that is not substantially different from the cutting of members using conventional abrasive grains, a dramatic improvement in cutting performance cannot be expected. there were.

  An object of the present invention is to provide a tip saw that can obtain a combined cutting function of a tip made of cemented carbide or cermet and abrasive grains.

According to the first aspect of the present invention, there is provided a chip saw in which saw teeth are formed on the outer periphery of the base metal at regular intervals, and the chips are brazed to one side of the saw teeth, and at least the saw tooth portions including the chips on both sides thereof are ground. The grains are attached.

According to a second aspect of the present invention, in the tip saw according to the first aspect, the abrasive grains are adhered from the blade edge to an intermediate position between the blade edge and the center hole.

The intermediate position between the cutting edge and the center hole includes both the case close to the cutting edge and the case close to the center hole, as well as the case where it is exactly the middle.

Examples of the abrasive grains include alumina, hydrocarbon, diamond, CDN and blue abrasive.

  In the tip saw of the present invention, a sawtooth is formed on the outer periphery of the base metal at a predetermined interval, and the tip is brazed to one side of the sawtooth, and at least the abrasive particles adhere to the sawtooth portion including the tip on both sides thereof. Therefore, when cutting the material to be cut, a dramatic cutting performance can be obtained by the combined effect of cutting with a tip and cutting with abrasive grains.

  Next, although embodiment of this invention is described according to drawing, this invention is not limited to this embodiment.

(Embodiment 1)
First, the basic structure of the tip saw according to the present embodiment will be described. As shown in FIGS. 1 and 2, the tip saw 10 has saw teeth 3 formed on the outer periphery of a base metal 2 made of alloy tool steel with a predetermined interval. An L-shaped tooth base 4 is formed on the side surface of the saw tooth 3 in the rotational direction, and a substantially square cermet chip 5 is brazed to the tooth base 4 as viewed from the side surface.

  Then, the tip saw 1 of the present embodiment is a blue abrasive grain (from the cutting edge 6 on both sides to the intermediate position between the cutting edge 6 and the center hole 7 of the tip saw 10 having the basic structure as shown in FIGS. 3 and 4. Blue abrasive) 8 is adhered by an adhesive or electrodeposited.

  (Embodiment 2)

  5 and 6 show a tip saw 21 according to another embodiment. The basic structure of the tip saw 21 of this embodiment is the same as that of the tip saw 10 of the above embodiment. Accordingly, the same reference numerals as those in the first embodiment are used to omit the description.

  In the tip saw 21 according to the present embodiment, blue abrasive grains (blue abrasive) 8 are adhered or electrodeposited with an adhesive from the blade edge 26 on both surfaces to the portion near the blade bottom 22 in the base metal 2.

  In the tip saw 1 and the tip saw 21, as shown in FIG. 7, the blue abrasive grains 8 are not attached to the outer peripheral portion including the squib face 9 and the flank face 11 of the saw blade 3, and the blue abrasive grains only on both sides 30. Although the grains 8 are adhered, the blue abrasive grains 8 may also adhere to the outer peripheral portion and the squeeze surface.

  [Cutting test]

  Next, the following cutting tests were performed on the tip saws 1 and 21 with abrasive grains according to each of the embodiments and a tip saw as a comparative example to be described later.

  As shown in FIG. 1, the tip saw of Comparative Example 1 is a tip saw 10 in which no abrasive grains are attached, and the tip saws 1 and 21 according to the first and second embodiments have their basics. It becomes a structure.

  As shown in FIG. 8, the tip saw 41 of Comparative Example 2 is an intermediate position between the blade bottom 42 and the center hole 43 on both sides of the body portion of the base metal 2 excluding the sawtooth 3 as shown in FIG. The blue abrasive grains 8 are attached.

  More specifically, the tip saw 10 according to Comparative Example 1 in which no abrasive grains are attached is more specifically an outer diameter of 203 mm × a blade width of 1.85 mm (plate thickness of 1.5 mm) × a center hole diameter of 15.875 mm × the number of blades of 42. It is.

  The blue abrasive grains 8 used in the first embodiment, the second embodiment, and the comparative example 2 are “GC # 80”. The tip saw of each embodiment and each comparative example is a material to be cut that is attached to the hand-type dry cutter C shown in FIG. 9 and fixed by the vise 52 on the work table 51 with the dry cutter C. An SS angle (50 mm × 50 mm × 6.0 t) 53 was cut under cutting conditions of a peripheral speed of 2360 m / min, a rotational speed of 3700 rpm, and a cutting time of about 7 to 20 seconds.

  The cutting test results are shown in Table 1 below.

As is apparent from Table 1, the tip saw of Comparative Example 1 in which no abrasive grains are attached has a limit of 215 times of cutting, and the cutting surface of the material to be cut from the beginning of cutting is a disadvantage that is a disadvantage of the tip saw. Strong lines were made. On the other hand, the tip saws according to Embodiment 1 and Embodiment 2 do not reach the cutting limit even after 300 times of cutting, and are still in a state that can be cut, and the cut surface has clean and fine lines from the beginning to the end. Continued to be recognized. In the tip saw of Comparative Example 2, good cutting similar to that in Embodiments 1 and 2 could be performed when the number of cuttings was less than 100, but after the number of cuttings exceeded 100, the cut surface gradually increased. The result was inferior to the tip saws according to the first and second embodiments.

  Note that the cutting limit means a state in which chipping or wear in the tip saw becomes large, and it takes 20 seconds or more to cut one material to be cut, or the cutting has stopped.

  According to the tip saw of the present invention, as described above, a good cut surface is maintained for a long time by the synergistic cutting effect of the tip and the abrasive grains, and thus it can be expected to be widely used in the field of this kind of tip saw.

It is a front view of the tip saw used as the basic structure to which the abrasive grain which concerns on the comparative example 1 is not adhered. It is the elements on larger scale of the chip saw of FIG. 1 is a front view of a chip saw according to Embodiment 1. FIG. It is the elements on larger scale of the chip saw concerning the embodiment. It is a front view of the chip saw which concerns on Embodiment 2. FIG. It is the elements on larger scale of the chip saw concerning the embodiment. It is an enlarged view of the outer peripheral part of the chip saw which concerns on Embodiment 1 and Embodiment 2. FIG. 10 is a front view of a tip saw according to Comparative Example 2. FIG. It is a figure which shows the outline | summary of a cutting test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tip saw 2 Base metal 3 Sawtooth 4 Tooth base 5 Tip 6 Cutting edge 7 Center hole 8 Abrasive grain

Claims (2)

  A chip saw in which saw teeth are formed at regular intervals on the outer periphery of a base metal, and chips are brazed to one side of the saw teeth, and abrasive grains are attached to at least saw blade portions including chips on both sides thereof.   The tip saw according to claim 1, wherein the abrasive grains are adhered from the blade edge to an intermediate position between the blade edge and the center hole.

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