JP3183126U - Portable electric circular saw tip saw - Google Patents

Abstract

An object of the present invention is to provide a portable device in which the edge of the cut surface on the uneven shape side is not easily chipped by cutting a siding board or the like having a decorative shape on one side for decoration, and the decorative property on the surface side of the board is not impaired. Providing a tip saw for electric circular saws.
A portable electric circular saw tip saw 10 is made of a material obtained by sintering polycrystalline diamond on a cemented carbide plate on a tip mounting seat 16 provided on a blade body 13 on the outer periphery of a disk-shaped base metal 11. A plurality of chips 21 are attached. The cutting edge of the tip 21 is an isosceles triangle that is inclined symmetrically toward both sides in the blade thickness direction.
[Selection] Figure 1

Description

  The present invention provides a plurality of chips made of cemented carbide or polycrystalline diamond on the outer periphery of the base metal of a portable electric circular saw chip saw that is used for cutting siding boards and the like that are frequently used as exterior wall materials in houses. The present invention relates to a chip saw for a portable electric circular saw to which is attached.

  Conventionally, as a tip saw used for this kind of portable electric circular saw, a tip processed into a blade plate shape as shown in FIG. 1 of Patent Document 1 or a tip 1 having a horizontal cutting edge 2 as shown in FIG. The one used is known. By using high-hardness polycrystalline diamond as the chip material, wear of the blade edge is suppressed in cutting a siding board or the like, and the life of the chip can be extended.

Japanese Patent Laid-Open No. 10-309626

  By the way, some siding boards used as the outer wall material have an uneven shape for decoration on one side. When a siding board having such a concavo-convex shape was cut using a conventional tip saw having a flat cutting edge, the edge of the cut surface on the concavo-convex shape side was likely to be chipped. Therefore, there is a problem that the decorativeness on the surface side of the siding board is impaired.

  The present invention is intended to solve such a problem, and by cutting a siding board or the like having a concavo-convex shape for decoration on one side, it is difficult for the edge of the cut surface on the concavo-convex shape side to be chipped. An object of the present invention is to provide a portable electric circular saw chip saw in which the decorativeness on the surface side of the board is appropriately secured.

  In order to achieve the above object, the structural feature of the present invention is that a cemented carbide or polycrystalline diamond is placed on the outer periphery of a disk-shaped base metal mounted on a portable electric circular saw used for cutting boards. In a portable electric circular saw tip saw with multiple tips attached, the tip of the tip is an isosceles triangle inclined symmetrically toward both sides of the blade thickness direction, or the tip side is flat and both sides are inclined symmetrically It is in the trapezoid shape.

  In the present invention configured as described above, the tip of the tip is an isosceles triangle inclined in a symmetrical shape toward both sides in the blade thickness direction, or a shape protruding in a trapezoid shape in which the tip side is flat and both sides are inclined in a symmetrical shape As a result, when cutting a siding board having a concavo-convex shape for decoration on one side, cutting is performed while the crest edge of the chip gradually bites into the concavo-convex surface of the siding board. Therefore, the resistance given to the uneven surfaces on both sides in the width direction of the chip can be suppressed as compared with the case where a flat cutting edge simultaneously bites into the uneven surface of the siding board as in the conventional chip. As a result, in the present invention, it is possible to effectively suppress the chipping of the cut surface on the uneven shape side of the siding board, so that the decorative property on the surface side of the cut siding board is maintained, and the product of the siding board Value is increased.

  In the present invention, by cutting the tip edge of the chip into an isosceles triangle or a trapezoidal shape, chipping of the edge of the cut surface is effective in cutting a siding board in which an uneven shape for decoration is formed on one side The decorativeness on the surface side of the siding board can be maintained and the commercial value of the siding board can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows roughly the portable electric circular saw chip saw which is Example 1 of this invention. It is a right view which shows the portable electric circular saw chip saw. It is an enlarged front view which expands and shows the chip | tip attachment part of the portable electric circular saw chip saw. It is an A line direction enlarged view which shows the arrow A direction of FIG. It is an enlarged front view which expands and shows the chip | tip attachment part in the chip saw for portable electric circular saws which is Example 2. FIG. FIG. 6 is an enlarged view in a B line direction showing an arrow B direction in FIG. 5. It is an enlarged view which expands and shows the rake face side of the chip | tip attachment part in the chip saw for portable electric circular saws which is a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a portable electric circular saw chip saw (hereinafter referred to as a chip saw) according to the first embodiment as a front view and a right side view, and FIGS. 3 and 4 show an enlarged front view of the chip saw. It is shown by the enlarged view of the line direction.

  The portable electric circular saw chip saw 10 is provided with a base metal 11 which is a thin circular plate made of steel. The base metal 11 is provided with a center hole 12 inserted into the rotating shaft of the processing machine at the center. The outer peripheral side of the base metal 11 is a substantially square blade body 13 protruding radially at 10 points at equal intervals in the circumferential direction, and a blade bag in which the space between the blade bodies 13 is relatively recessed in the radial direction. It is 15. The vicinity of the rotational rear of the outer periphery of the blade body 13 is a concave portion 14 slightly recessed in the radial direction. A mounting seat 16 for mounting the chip 21 is provided at the front end of the blade body 13 on the front side of the blade 13 by cutting it at a right angle. Further, the arbitrary first, third, sixth and eighth ones in the rotational direction among the ten blade bodies 13 extend from the intermediate position of the recess 14 to the inside of the blade body 13 in the radial direction. A slit 17 is formed. Both surfaces of the blade body 13 are roughened by shot blasting, and are separated from an annular portion on the radially inner side.

  As shown in FIGS. 3 and 4, the chip 21 bakes a polycrystalline diamond 23 having a thickness of about 0.5 mm on the cutting side onto a cemented carbide plate 22 having a thickness of about 1.5 mm serving as the base of the chip 21. It is formed by cutting a plate material formed by knotting. The tip 21 has a width of 1.5 mm, is formed in a shape that protrudes into an isosceles triangle with the blade edge 24 side symmetrical and a vertex angle of 90 °, and the flank face on the blade edge 24 side is super hard with respect to the rake face 26. It is inclined at approximately 70 ° toward the alloy 22 side, and the blade bottom 25 side is formed at right angles to the rake face 26. The tip 21 is fixed to the mounting seat 16 by brazing, whereby the rake face 26 is slightly inclined toward the front of the rotation, and the flank face is substantially flush with the outer side face of the subsequent blade body 13. . The rake angle is 10 °.

  In the first embodiment, the cutting edge 24 of the chip 21 has a shape protruding in an isosceles triangle inclined in a symmetrical shape toward both sides in the width direction, so that an uneven shape for decoration is formed on one side. When the siding board is cut, the cutting edge 24 protruding in a mountain shape of the chip 21 is cut while gradually biting into the uneven surface of the siding board. Therefore, the resistance given to the concavo-convex surface of the cutting edge 24 of the chip 21 is suppressed as compared with the case where the flat cutting edge 2 simultaneously bites into the concavo-convex surface of the siding board as in the conventional chip 1 shown in FIG. As a result, in Example 1, since the chipping of the cut surface of the siding board on the uneven shape side can be effectively suppressed, the decorativeness on the surface side of the cut siding board is maintained, and the siding board Product value is increased.

  As a specific example of Example 1, the tip saw 10 with the tip 21 brazed to the outer periphery 10 locations of the base 11 having an outer diameter of 100 mm, a hole diameter of 20 mm, and a thickness of 1.0 mm is attached to the electric tool with a sawing amount of 5 mm. A siding board (wooden cement board with an uneven surface on one side) was cut at a rotational speed N = 9000 rpm. As a comparative example, a chip saw in which ten conventional chips 1 shown in FIG. As a result, when cutting the siding board using the tip saw 10, no chipping of the cut surface on the uneven shape side is observed, and on the other hand, in the cutting using the tip saw of the comparative example, it is obvious at the edge of the cut surface on the uneven shape side. It was confirmed that clear gaps were observed between the two.

Next, Example 2 will be described.
In Example 2, as in Example 1, a chip 31 formed by processing a plate material in which polycrystalline diamond 33 having a thickness of about 0.5 mm is formed on a cemented carbide plate 32 having a thickness of about 1.5 mm by sintering. 5 and 6, the shape of the blade edge 34 is an isosceles trapezoid with a substantially 1/3 width portion in the middle of the blade edge side being horizontal, and approximately 1/3 portions on both sides being symmetrical and having an apex angle of 70 °. It has a shape protruding. The structure of the other parts is the same as that of the chip 21. Even if the siding board is cut using the tip saw with the tip 31 mounted, the same effect as the tip saw 10 of the first embodiment can be obtained.

  In each of the above embodiments, the description has been made using the polycrystalline diamond chip, but a cemented carbide chip may be used. Cemented carbide is inferior in durability to polycrystalline diamond, but the sharpness at the initial cutting is good due to the sharp cutting edge. Further, the outer shape of the chip, the outer shape of the base metal, and the like are examples, and various modifications can be made without departing from the spirit of the present invention.

  In the present invention, the cutting edge of the tip of a portable electric circular saw tip saw is formed into an isosceles triangle or a trapezoidal shape, so that a siding board having a concavo-convex shape for decoration is formed on one side. This is useful because it is possible to effectively suppress chipping at the edge of the cut surface, maintain the decorativeness of the surface side of the siding board, and increase its commercial value.

DESCRIPTION OF SYMBOLS 10 ... Portable electric circular saw chip saw, 11 ... Base metal, 13 ... Blade body, 16 ... Mounting seat, 21, 31 ... Chip, 22, 32 ... Cemented carbide plate, 23, 33 ... Polycrystalline diamond, 24 34 ... The cutting edge.

Claims (1)

In a portable electric circular saw tip saw mounted on a portable electric circular saw, a plurality of chips made of cemented carbide or polycrystalline diamond attached to the outer periphery of a disk-shaped base metal,
The tip of the tip is an isosceles triangle that is symmetrically inclined toward both sides in the blade thickness direction, or a trapezoid that is flat on the tip side and symmetrically inclined on both sides. Tip saw.

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