JP6436429B2 - Tip saw - Google Patents

Description

  The present invention is used when a plurality of chips are fixed in a predetermined form on the outer peripheral edge of a disk-shaped base metal plate made of steel, and are mounted on an electric tool to cut wood or the like as a work material. Related to the tip saw.

  In recent years, for example, when cutting wood at a residential building site, cutting methods such as horizontal grinding, vertical grinding, or 45-degree diagonal grinding have been employed. Conventionally, cutting of these wood has been done with a tip saw mounted on an electric tool. In this tip saw, a plurality of tip fixing portions made of steps or recesses are formed at predetermined intervals on the outer peripheral edge of a steel plate base metal, and each chip fixing portion is made of cemented carbide or the like. Each chip is fixed. At this time, each chip is fixed in a form that protrudes alternately by a predetermined dimension from both side surfaces of the base metal (a dust blade type), or a shape that protrudes from both side surfaces of the base metal and that has different scooping surface angles. It is fixed with (double-sided blade type). In addition, the gazette regarding this kind of chip saw is disclosed by patent document 1, for example.

JP 2005-324295 A

  However, in the case of the cutting edge type tip saw, although the resistance at the time of cutting is small and a light sharpness is obtained, the quality of the cut surface of the cut part is inferior and the linearity at the time of cutting is lacking. In this case, for example, when wood as a material to be cut is slanted at 45 degrees (oblique cutting), resistance at the time of cutting increases, resulting in a heavy sharpness and poor workability.

  Also, in any of the tip saws, each tip has an acute angle portion that functions as a cutting blade and an obtuse angle portion that functions as a stable blade, and these acute angle portions and obtuse angle portions alternately appear from both sides along the rotation direction of the base metal. In addition to being fixed in the protruding state, the sharp height of the acute angle part and the obtuse angle part are set to be the same, so the blade of the obtuse angle part rubs against the wood, especially in the case of oblique grinding, and friction occurs in that part. As a result, there is an inconvenience that a good cut skin cannot be obtained, for example, the cut surface is burnt. In particular, in the case of a chip saw in which a slit of a predetermined shape is formed with a predetermined length from the outer peripheral edge of the base metal toward the center position in order to prevent warpage of the base metal at the outer peripheral edge of the chip, The vibration at the time of rotation of gold causes blurring in the slit portion, and the above-mentioned disadvantages are likely to become more prominent.

  The present invention has been made in view of such circumstances, and its purpose is to burn the cut surface of the material to be cut without damaging good straightness at the time of cutting, even in the case of oblique grinding. It is an object of the present invention to provide a tip saw that can obtain a good cut skin with no occurrence of the above.

In order to achieve this object, the invention according to claim 1 of the present invention is such that a plurality of chip fixing portions are formed on the outer peripheral edge portion of the disk-shaped base metal, and a chip is provided at each chip fixing portion. In each of the fixed chip saws, each of the chips has an acute angle portion and an obtuse angle portion at both ends in the thickness direction corresponding to the plate thickness direction of the base metal, and these are along the rotation direction of the base metal. The base metal is fixed to the chip fixing part so as to protrude alternately from both side surfaces of the base metal, and the base metal has a plurality of slits formed from the outer peripheral edge part toward the center position direction, and is adjacent to the slits. The set height of the acute angle part of the pair of chips before and after the rotating direction is set to be lower by a predetermined dimension than the set height of the acute angle part of the chip corresponding to the chip adjacent to the slit in the part other than the slit, Next to the slit Rotation clam height of obtuse portion of the front-rear direction of the pair of chips, characterized in that it is set to be the same as the clam height of obtuse portion of the corresponding chip to the chip adjacent to the slit at a portion other than the slit .

In addition, the invention described in claim 2 is characterized in that the predetermined dimension is 1/10 to 1/2 of a set height of an acute angle portion of a chip other than the slit . Furthermore, the invention described in claim 3 is characterized in that the tip surface and the scooping surface of the chip are alternately inclined with respect to the plate thickness direction of the base metal.

According to the first aspect of the present invention, each chip has an acute angle portion and an obtuse angle portion at the tip thereof, and these chips protrude alternately from both side surfaces along the rotation direction of the base metal. in conjunction is secured to the chip fixing portion, sharp portions of the pair of chips located before and after the rotation direction of the base metal of the slits, the predetermined size is the clam height relative sharp corners of the chip parts other than the slit Because it is set low and the obtuse angle part is set to the same crest height, even if blurring occurs on the tip of the slit part due to vibration during base metal rotation, straightness and cut skin with a sharp crest part with low crest height For example, even in the case of oblique grinding , it is possible to prevent occurrence of scoring of the cut surface at an obtuse angle portion where the height is low and to suppress the deterioration of the quality and to improve the cutting quality. Skin can be easily obtained.

Further, according to the invention described in claim 2 , in addition to the effect of the invention described in claim 1 , the predetermined dimension is 1/10 to 1 with respect to the height of the sharp edge portion of the chip other than the slit. Since it is / 2, it is possible to set the set height of the chip in each of the three parts of the acute angle part, the obtuse angle part and the slit part to an optimum state, and to prevent the straightness and the cut of the cut skin more reliably. .

Furthermore, according to the invention described in claim 3 , in addition to the effect of the invention described in claim 1 or 2 , the tip surface and the scooping surface of the chip are alternately inclined with respect to the thickness direction of the base metal. Therefore, a chip saw with excellent sharpness can be easily obtained with each chip.

  The side view which shows the tip saw concerning this invention   The side view which expanded the principal part of the same figure 1   The plan view   Front view of the chip other than the slit   Front view of chip in the slit   Explanation of each chip

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 6 show an embodiment of a tip saw according to the present invention. As shown in FIG. 1, the tip saw 1 has a disc shape formed of a carbon steel plate or the like having a predetermined plate thickness, and has a base metal 2 in which a mounting hole 3 for an electric tool (not shown) is formed at the center position. ing.

  On the outer peripheral edge 2a of the base metal 2, chip fixing portions 4 having a substantially step shape are formed at predetermined (constant) intervals, and the base metal 2 is disposed on the front side in the rotational direction A of the chip fixing portion 4. The blade chambers 5 that are recessed in the direction of the mounting hole 3 (center position) are respectively formed. A chip 6 made of, for example, a cemented carbide formed as described later is fixed to each chip fixing portion 4 of the base metal 2 by brazing.

  In addition, a total of four slits 7 are formed in the cross position of the outer peripheral edge 2 a of the base metal 2. The slit 7 is formed at a slit portion 7a having a predetermined width and a predetermined length extending linearly from the bottom of the blade chamber 5 at the cross position of the outer peripheral edge portion 2a in the direction of the mounting hole 3, and at the end of the slit portion 7a. And a circular hole 7b. The slit 7 prevents the base metal 2 from being distorted from heat shrinkage that occurs when cutting with the chip saw 1.

  As shown in FIGS. 2 and 3, the tip 6 has a front end surface 6a located on the outer peripheral side, a scooping surface 6b continuous at a predetermined angle with the front end (blade edge) of the front end surface 6a in the rotational direction a, Both side surfaces 6c and 6d having a crest height and a fixing surface 6e having a substantially L shape in side view corresponding to the shape of the chip fixing portion 4 are provided. In addition, as shown in an enlarged view in FIG. 3, each chip 6 has a vertical width of the fixing surface 6e by making the widths of both side surfaces 6c and 6d formed obliquely different when viewed from the front end surface 6a. The scooping surface 6b is not parallel to the part, and is inclined at a predetermined angle in the horizontal direction with respect to the plate thickness t of the base metal 2. Further, the tip surface 6 a of each chip 6 is also inclined linearly by a predetermined angle in the direction perpendicular to the plate thickness t of the chip 6.

  Furthermore, each chip 6 has a thickness (dimension in the vertical direction in FIG. 3) larger than the plate thickness t of the base metal 2, and both end portions in the thickness direction are from both side surfaces 2 b and 2 c of the base metal 2. In addition to being fixed so as to protrude by a predetermined dimension, as described above, the scooping surface 6b having a predetermined inclination angle is fixed so that the directions of the scooping surfaces 6b are alternately different from each other along the rotation direction (a). Thus, there are three types of chips in a fixed state, which will be described later. The chips 6 are all set to the same shape in a single unit that is not fixed to the base metal 2.

Then, a substantially L-shaped fixing surface 6e in side view of each chip 6 is fixed to the chip fixing portion 4 having a substantially L shape in side view, and each chip 6 in the fixed state has the following height and the like. Is set to That is, the tip 6-1a on the front side in the rotational direction A and the tip 6-1b on the rear side in the rotational direction A fixed to the slit 7 other than before and after the rotational direction A (other than the slit portion) are shown in FIG. It is formed as shown in FIG. That is, each of the chips 6-1a and 6-1b includes an acute angle portion 8 in which the angle α between one end in the thickness (width) direction of the tip surface 6a and one side surface 6c is less than 90 degrees, and the thickness of the tip surface 6a . Each has an obtuse angle portion 9 in which the angle β between the other end in the direction and the other side surface 6d exceeds 90 degrees.

  In FIG. 4, the dimension h1 (referred to as the set height h1) with respect to the side surfaces 2b and 2c of the base metal 2 of each acute angle portion 8 of the chips 6-1a and 6-1b is set to h1 = 0.3 mm. The obtuse angle part 9 of each of the chips 6-1a and 6-1b is such that the dimension relative to the acute angle part 8 of the chip 6-1a before and after the rotation direction A is lower by h2 = 0.03 mm to 0.1 mm (of the obtuse angle part 9). Crest height = h1-h2). The dimension h2 is set by polishing (side polishing) the side surface 6d on the obtuse angle portion 9 side of the chip 6 having the same thickness, and thereby, the clearance height of the obtuse angle portion 9 of the chips 6-1a and 6-1b. However, h2 is lower than the set height h1 of the acute angle part 8, and the obtuse angle part 9 is in a state of being retracted in the direction of the base metal 2.

On the other hand, a pair of chips 6-2a and 6-2b in the slit portion positioned before and after the rotational direction A of the slit 7 are formed as shown in FIG. That is, a pair of chip 6-2a, 6-2b, by polishing dimension h3 side to side 6c of the chip 6 having the same shape as the other than the slit portion indicated by the two-dot chain line in FIG. 5, sharp edges 8, wherein chip 6-1a, is set to be dimension h3 = 0.03mm~0.1mm lower against the sharp edges 8 of 6-1b.

That is, the acute angle 8 of the pair of chips 6-2a and 6-2b (in this example, a total of eight chips) of the slit portion 7 is the acute angle portion 8 of the chips 6-1a and 6-1b other than the slit portion. in for, is the clams height set lower becomes the dimension h3 low (clam acute angle portion 8 height = h1-h3), the chip 6-2a, sharp corners 8 of 6-2b are each the base metal 2 directions It is in a retracted state.

  FIG. 6 shows the role of each chip 6 and its height. The “upper blade” and the “lower blade” shown in the role column and the crest height column of FIG. 6 are the blades (the acute angle portion 8) positioned on the upper side or the lower side in the drawing in each chip 6 of FIG. Or the obtuse angle part 9) is shown. As apparent from FIG. 6, the tip number 3 which is the tip 6-2a on the front side in the rotational direction (a) of the slit 7 (with a slit) has a role of the upper blade (obtuse angle portion 8) as a stable blade and a lower blade. The role of (acute angle portion 9) is a cutting blade, and the heights of the upper blade and the lower blade are both low.

  Further, the tip number 4 which is the tip 6-2b on the rear side in the rotational direction A has a role opposite to the tip number 3 (the role of the upper blade is a cutting blade and the role of the lower blade is a stable blade), and the upper side Both the heights of the blades and the lower blades are the same as the chip number 3. In addition, in the chip numbers 1, 2, 5, and 6 which are the chips 6-1a and 6-1b other than the slit portion, the roles of the upper blade and the lower blade are “stable blade” and “cut” before and after the rotation direction A. The blades are alternately arranged, and the height of the claws is alternately “high” and “low” before and after the rotational direction a.

  As a result of mounting the tip saw 1 configured in this way on an electric tool and actually grinding the wood diagonally, the cut surface is not damaged and the cut surface is not burned and the like is not damaged. Has been confirmed to be obtained. The reason for this is that the obtuse angle portion 9 of the chips 6-1a and 6-1b other than the slit portion does not directly act on the cutting, and the vibration due to the rotation of the base metal 2 at the time of cutting causes blurring in the slit 7 portion. Even so, since the heights of the sharp corners 8 and the obtuse corners 9 of the chips 6-2a and 6-2b at the slit 7 are set to be low, the chips 6-2a and 6-2b are cut off. This is thought to be due to the fact that the friction with the surface is reduced (suppressed). It has also been confirmed that cutting performance similar to that of the prior art can be obtained even in horizontal grinding and vertical grinding other than diagonal grinding.

  As described above, according to the tip saw 1, the acute angle portion 8 and the obtuse angle portion 9 are formed at both ends in the thickness direction of the tip surface 6 a of each tip 6, respectively, and these both sides along the rotation direction A of the base metal 2. Since it is fixed to the chip fixing portion 4 so as to alternately protrude from the surfaces 2b and 2c, and the set height of the obtuse angle portion 8 is set lower than the set height h1 of the acute angle portion 8, It is possible to ensure the stability of cutting with the obtuse angle part 8 with a low height, while obtaining a predetermined cutting performance and straightness with the acute angle part 8 with a high height. As a result, for example, even when wood is slanted, a good cut skin can be easily obtained by suppressing the quality deterioration of the cut surface by the obtuse angle portion 9 having a low set height.

In particular, a pair of chip 6-2a slit portion of the base metal 2, sharp corners 8 of 6-2b is, chip 6-1a in the portion other than the slits, its clams height against the sharp edges 8 of 6-1b Since both of the dimensions h3 are set low, even if the vibration is generated in the slits 6-2a and 6-2b due to vibration during the rotation of the base metal, both the acute angle part 8 and the obtuse angle part having a low crushing height. No. 9 can surely prevent the straightness and the cut of the cut skin, and better oblique grinding is possible.

  The heights h2 and h3 of the set heights are 1/10 to 1/2 (preferably 0.03 mm to 0.1 mm with respect to the set height h1 of the acute angle portion 8 of the chips 6-1a and 6-1b. ) Since it is set to be low, the set height of the tip 6 of each of the three parts of the acute angle part 8, the obtuse angle part 9 and the slit 7 part is set to an optimum state, and the straightness and the cut skin are reduced. This can be prevented more reliably.

  Further, since the dimensions h2 and h3 with respect to the acute angle portion 8 are set by polishing the side surfaces 6c and 6d of the chip 6, all the chips 6 fixed to the chip fixing portion 4 have the same shape. Polishing after fixing to the chip fixing portion 4 can be achieved, and the cost can be reduced by using the chip 6 in common, and the side surface of a predetermined chip 6 can be polished by using a conventional side polishing machine. Therefore, it is possible to obtain a chip saw 1 that is inexpensive and suitable for oblique grinding while suppressing the capital investment. At the same time, the tip surface 6a and the scooping surface 6b of the chip 6 are inclined in a predetermined direction of the thickness of the base metal 2 and are alternately fixed along the rotational direction A. Therefore, the chip saw 1 having excellent sharpness can be easily obtained. Can be obtained.

  In the embodiment, the number and shape of the chip fixing portions 4 of the base metal 2, the number and shape of the slits 7, the shape of each chip 6, the set height h 1, the dimensions h 2 and h 3 are examples. For example, the scooping surface 6b of the chip 6 is parallel to the fixing surface 6e, the slits 7 are non-linear, or five or more (for example, eight) are formed. An appropriate configuration can be employed.

  The present invention can be used not only for a wood saw chip saw, but also for a chip saw that cuts plastic or the like as a workpiece.

  DESCRIPTION OF SYMBOLS 1 ... Tip saw, 2 ... Base metal, 2a ... Outer peripheral edge part, 2b, 2c ... Side surface, 3 ... Mounting hole, 4 ... Tip fixed part, 5 ... Blade chamber , 6... Chip, 6-1a, 6-1b... Chip other than slit part, 6-2a, 6-2b... Slit part, 6a. Surface, 6c, 6d ... side face, 6e ... fixing surface, 7 ... slit, 7a ... slit part, 7b ... hole part, 8 ... acute angle part, 9 ... obtuse angle part .

Claims (3)

In a chip saw in which a plurality of chip fixing portions are formed on the outer peripheral edge of the disk-shaped base metal, and chips are fixed to the respective chip fixing portions,
Each of the chips has an acute angle portion and an obtuse angle portion at both ends in the thickness direction corresponding to the plate thickness direction of the base metal, and these alternate from both side surfaces of the base metal along the rotation direction of the base metal. Fixed to the chip fixing part so as to protrude to
The base metal has a plurality of slits formed toward the center position direction from the outer peripheral edge portion thereof, and the height of the sharp corners of a pair of chips adjacent to the slit in the rotational direction is set to be other than the slits. Is set to a predetermined dimension lower than the height of the sharp edge of the chip corresponding to the chip adjacent to the slit in the part,
The set height of the obtuse angle part of the pair of chips adjacent to the slit in the rotation direction is set to be the same as the set height of the obtuse angle part of the chip corresponding to the chip adjacent to the slit in a part other than the slit. Chip saw characterized by. 2. The chip saw according to claim 1, wherein the predetermined dimension is 1/10 to 1/2 of a set height of an acute angle portion of a chip other than the slit . The tip saw according to claim 1 or 2, wherein the tip end surface and the scooping surface of the tip are alternately inclined with respect to the plate thickness direction of the base metal .

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