JP2005231016A - Spinning saw with chips, and chip grinding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance durability of a chip for a spinning saw by curbing the heating of the chip through reduction of friction resistance in cut scraps on the cutting face of each chip by forming a grinding streak extending from the tip of the cutting face to the base portion. <P>SOLUTION: In the spinning saw with chips in which many chips (13) are set in the circumferential direction around a disk-shaped base metal (11), a grinding streak (K1), extending from the tip of a cutting face (13a) of each chip (13) to its based portion, is formed. While a small-diameter grinding stone (15), which can be engaged with a gap part (A) between blade stands (12), adjoining in the circumferential direction as shown in Fig. 1, is revolved with its center line running almost in parallel with the rotational center line of the base metal (11), the grinding stone is arranged to grind the cutting face (13a) of each chip after the stone is transferred roughly to the radius direction of the base metal (11). Through such activities, a grind streak (K1), extending from the tip of the cutting face (13a) to its base direction, is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a rotary saw with a chip for cutting wood, aluminum material, steel material and the like and a chip grinding method thereof.

A conventional technique is shown in FIG. In FIG. 10, reference numeral 1 denotes a rotary saw with a chip having a large number of chips 4 on its outer periphery, and a sawtooth-shaped blade base 3 is formed on the outer periphery of a disk-shaped base metal 2 at a predetermined pitch in the circumferential direction. The chip 4 is brazed to the rotating surface side of the table 3. The base metal 2 is formed of a steel plate material such as SKS-5 or SK-5, and the tip 4 is formed of cemented carbide, and after brazing to each blade base 3, the rake face 4a, relief The surface 4b and the left and right side surfaces 4c are ground and finished.

In this case, the rake face 4a is ground as shown in FIG. That is, a grinding wheel 5 formed by fixing a ring-shaped grindstone 5b to the outer peripheral end face of a large-diameter dish-shaped rotating body 5a is provided, and the grinding wheel 5 is orthogonal to the outside of the rotary saw 1 with a tip. The grinding wheel 5b is slidably contacted with the rake face 4a to grind the rake face 4a.
JP 2002-79442 A.

In the conventional one, the grinding wheel 5 rotates in the blade width direction of the chip 4 to grind the rake face 4a, so that as shown in FIG. 10, grinding marks (wheel marks) K generated on the rake face 4a. Is formed to extend sideways (blade width direction). For this reason, when the workpiece is cut, chips flowing along the rake face 4a flow perpendicularly to the extending direction of the grinding marks K, and the friction resistance against the chips on the rake face 4a is increased, and the chip 4 is It was heated, and the durability of the chip 4 was lowered. It is an object of the present invention to obtain a novel rotary saw with a tip that solves the above problems.

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is a rotary saw with a chip in which a large number of chips are provided on the outer periphery of a disk-shaped base metal at a predetermined pitch in the circumferential direction. A grinding striation extending in the direction is formed.
According to a second aspect of the present invention, a grinding striation extending in the base direction from the tip is formed on the rake face of the chip, and a grinding striation extending in the rotation direction of the base metal is formed on the flank face of the chip. is there.
According to a third aspect of the present invention, the rake face has a circular arc shape in which the side cutting edges on both the left and right sides protrude in the rotational direction from the center part on the left and right.
According to a fourth aspect of the present invention, a saw-tooth shaped blade base is formed on the outer periphery of a disk-shaped base metal at a predetermined pitch in the circumferential direction, and a chip is fixed to the rotating surface side of each of the blade bases. A small-diameter grinding wheel that fits into the gap between adjacent blades is provided, the grinding wheel is rotated about an axis substantially parallel to the axis of rotation of the base metal, and the grinding wheel is used as a base metal. On the other hand, the rake face of each of the chips is ground by moving in a substantially radial direction, and a grinding striation extending in the base direction from the tip is formed on the rake face.

In the present invention, since the grinding streak extending in the base direction from the tip thereof is formed on the rake face of the chip, the chips when the workpiece is cut flows along the grinding streak of the rake face, The frictional resistance of chips on the rake face is reduced. In addition, since the grinding striation extending in the rotation direction of the base metal is formed on the flank face of the chip, the cut surface of the workpiece is slid along the grinding striation of the flank face, The frictional resistance with the workpiece will be reduced. For this reason, heating of a chip | tip is further suppressed and durability of this chip | tip becomes high.

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a side view showing a grinding state of a chip rake face according to a first embodiment of the present invention, FIG. 2 is an enlarged perspective view of the chip part of FIG. 1, and FIG. 3 is an enlarged front view of the chip part of FIG. 4 is a plan view of FIG. 3, FIG. 5 is an enlarged sectional side view showing the grinding state of the chip rake face according to the second embodiment of the present invention, and FIG. 6 is grinding of the chip rake face according to the third embodiment of the present invention. FIG. 7 is an enlarged front view corresponding to FIG. 3, showing an example having a different chip shape, FIG. 8 is a plan view of FIG. 7, and FIG. 9 is a side view of FIG.

In FIG. 1, reference numeral 10 denotes a rotary saw with a tip. A saw blade 12 is formed on the outer periphery of a disk-shaped base 11 at a predetermined pitch in the circumferential direction, and a tip is formed on the rotary surface side of each blade 12. 13 is brazed. The base 11 is made of a steel plate material such as SKS-5 or SK-5, and the tip 13 is made of a cemented carbide. As shown in FIG. 1, the rake face 13a of the chip 13 according to this example is formed in an arc shape on the upper side of the chip body during rough machining. After each of the chips 13 is brazed to each of the blades 12, the rake face 13a, the flank face 13b, and the left and right side faces 13c are ground and finished.

In this case, the rake face 13a and the flank face 13b are ground as follows. First, as shown in FIG. 1, the rake face 13a is provided with a grinding wheel 15 having a small diameter that fits in the gap (a) of the blade base 12 adjacent in the circumferential direction, in this example, about 6 mm in diameter. While the grindstone 15 is rotated counterclockwise around the axis orthogonal to the outer side of the rotary saw 10, that is, rotated in the direction of the arrow C 1, the grinding grindstone 15 is rotated in the center direction (the direction of the arrow B) with respect to the rotary saw 10. ) And the rake face 13a of the target chip 13 is ground. Thereby, as shown in FIGS. 2 to 4, a grinding mark K <b> 1 extending in the base direction from the tip is formed on the rake face 13 a.

Further, the flank 13b is provided with a large-diameter disk-shaped grinding wheel 16 as shown by an imaginary line in FIG. 1, and the grinding wheel 16 has an axis perpendicular to the outer side of the rotary saw 10. The grinding wheel 15 is moved in the center direction with respect to the rotary saw 10 while rotating rightward as the center, that is, in the direction of the arrow C2, and the flank 13b of the target chip 13 is ground. As a result, as shown in FIGS. 2 and 4, a grinding mark K2 extending in the rotational direction of the rotary saw 10 is formed on the flank 13b. In the figure, reference numeral 14 denotes a chip breaker formed on the flank 13b. When the tip cutting edge 13d and the side cutting edge 13e of the tip 13 are worn due to long-term use, the flank 13b and the left and right side faces 13c of the tip 13 are ground and the tip cutting edge 13d and side face are ground. The cutting edge 13e is restored sharply.

5 and 6 show a second example and a third example of the grinding mode of the chip rake face. 5 and 6, reference numeral 20 denotes a jig for holding a single chip, and has a holding recess 20a on the upper surface. The chip 21 roughly processed in the holding recess 20a is fitted and held with its rake face 21a side exposed upward. In this state, a large-diameter grinding wheel 22 having a disc shape slightly thicker than the blade thickness of the chip 21 and having an outer peripheral grinding surface 22a having an arcuate cross section is disposed above the jig 20. Then, as shown in FIG. 5, the grinding wheel piece 22 is moved downward (in the direction of arrow D) while rotating in the base direction (in the direction of arrow C3) from the tip side of the tip 21, and the rake face 21a. Grind. Or, as shown in FIG. 6, the grinding wheel 22 is rotated from the tip side of the tip 21 toward the base direction (arrow C3 direction) and from the front side of the tip 21 toward the rear side (arrow E direction). The rake face 21a is ground by moving.

As a result, the rake face 21a is ground into a circular arc groove shape as shown in FIG. 8, and a grinding mark K1 (FIG. 7) extending from the tip of the rake face 21a in the base direction is formed on the rake face 21a. In this case, as shown in FIG. 5, when the grinding wheel piece 22 is rotated in the arrow C3 direction and moved in the arrow D direction for grinding, the rake face 21a is directed from the tip toward the base as shown in FIG. As shown in FIG. 6, when the grinding wheel piece 22 is rotated in the direction of the arrow C3 and moved in the direction of the arrow E for grinding as shown in FIG. 6, the rake face 21a has a tip as shown in FIG. From the side toward the base, the shape is linear in side view. In order to smooth the rake face 21a of the chip 21, a large number of chips 21 are arranged and fitted in the holding recess 20a in parallel, and a wide disc grindstone is rotated in the direction of arrow C3 in FIG. While moving in the direction of arrow E or rotating in the direction of arrow C3 in FIG. 5, it is also possible to move in the direction of arrow D, thereby grinding the numerous chips 21 arranged in a stroke.

7 and 8, after the tip 21 ground with the grinding wheel 22 is brazed to the blade base 12 of the base 11, the flank 21b and the left and right side surfaces 21c of the tip 21 are separated from each other. Finish with a grinding wheel. In this example, the flank 21b is also ground with a disk-shaped grinding wheel similar to the above-described grinding wheel 22, so that the flank 13b has a circular arc shape when viewed from the front (FIG. 7), and in the rotational direction of the rotary saw 10. An extending grinding mark K2 (FIG. 8) is formed. When the tip cutting edge 21d and the side cutting edge 21e of the tip 21 are worn due to long-term use, the tip 21 and the side cutting edge 21d and the side surface 21c of the tip 21 are ground by grinding. The cutting blade 21e is restored sharply.

According to the above embodiment, since the grinding mark K1 extending in the base direction from the tip is formed on the rake face 13a (21a) of the chip 13 (21), the chips when the workpiece is cut are removed from the grinding line. It flows along the mark K1, and the frictional resistance of the chips on the rake face 13a is reduced. For this reason, heating of the chip 13 is suppressed, and the durability of the chip 13 is increased. Further, as shown in FIG. 5, the rake face 21a of the chip 21 is ground with the chip 21 as a single unit, and a grinding mark K1 extending in the base direction from the tip is formed, and this is attached to the base metal 11. In this case, the grinding striation K1 extending in the base direction from the tip of the tip 21 is formed on the rake face 21a of the tip 21 with the large-diameter grinding wheel 22 without being influenced by the pitch of the blade 12 (blade pitch). The durability of the grinding wheel 22 can be increased.

It is a side view which shows the grinding state of the chip rake face by 1st Example of this invention. It is an expansion perspective view of the chip | tip part of FIG. FIG. 3 is an enlarged front view of a chip portion in FIG. 2. FIG. 4 is a plan view of FIG. 3. It is an expanded sectional side view which shows the grinding state of the chip rake face by 2nd Example of this invention. It is an expanded sectional side view which shows the grinding state of the chip rake face by 3rd Example of this invention. FIG. 4 is an enlarged front view corresponding to FIG. 3, showing examples of different chip shapes. FIG. 8 is a plan view of FIG. 7. It is a side view of FIG. It is an expansion perspective view of the chip | tip part which shows a prior art example. It is a partial cross section side view which shows the grinding state of the chip scoop surface which shows a prior art example.

Explanation of symbols

10 Rotary Saw with Tip 11 Base 12 Tool Base 13 (21) Tip 13a (21a) Rake Face 13b (21b) Flank 13c (21c) Left and Right Sides 13d (21d) Tip Cutting Edge 13e (21e) Side Cutting Edge 14 Tip Breakers 15, 16 Grinding wheel K1, K2 Grinding streak (A) Gap 20 Jig 20a Holding hole 22 Grinding wheel 22a Grinding surface

Claims (4)

In a rotary saw with a chip in which a large number of chips (13) are provided at a predetermined pitch in the circumferential direction on the outer periphery of a disk-shaped base metal (11), the tip (13a) of the chip (13) is connected to the rake face (13a) from its tip. A rotary saw with a tip formed with a grinding striation (K1) extending in a base direction. 2. The rotary saw with a tip according to claim 1, wherein a grinding striation (K2) extending in the rotation direction of the base metal (11) is formed on the flank (13b) of the tip (13). The rake face (21a) of the tip (21) has a cross-sectional arc shape in which the side cutting edges (21e) on both the left and right sides protrude in the rotational direction from the center portion on the left and right sides. Rotary saw. A saw-tooth shaped blade base (12) is formed on the outer periphery of the disk-shaped base metal (11) at a predetermined pitch in the circumferential direction, and the tip (13) is fixed to the rotating surface side of each of the blade bases (12). A small-diameter grinding wheel (15) that fits in the gap (a) of the blade base (12) adjacent in the circumferential direction, and the grinding wheel (15) is connected to the rotational axis of the base metal (11). The rake face (13a) of each chip is ground by rotating the grinding wheel (15) in a substantially radial direction with respect to the base metal (11) while rotating about a substantially parallel axis. A tip grinding method for a rotary saw with a tip, characterized in that a grinding striation (K1) extending in the base direction from the tip is formed on (13a).

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