JP5950419B2 - Chip saw for composite materials - Google Patents

Description

  The present invention particularly relates to a chip saw that can be used for cutting a composite material such as a fiber reinforced plastic (CFRP) using a thermoplastic resin as a matrix and carbon fibers as a filler.

  Fiber reinforced plastic is a composite material formed by mixing fillers such as glass fibers in a matrix such as thermosetting resin or thermoplastic resin, and is relatively inexpensive, while being lightweight and excellent in physical strength. Therefore, carbon fiber reinforced plastic (CFRP) has high strength and light weight, so it has been put into practical use for sports and outdoor applications such as golf club shafts and fishing rods. At present, the application has been expanded to industrial applications such as aircraft, trains, and automobiles, and is also widely used in the construction field such as construction and seismic reinforcement of bridges.

  When cutting such fiber reinforced plastics, water jets obtained by passing pressurized water through small holes, etc., or cutting with diamond abrasive grains attached to the outer periphery of a disk-shaped base metal Grinding stones are generally used, but these are expensive in cost, and in the case of the above-mentioned cutting grindstone, clogging is likely to occur during the cutting of the fiber reinforced plastic material, the processing speed is likely to be lowered, and the cutting efficiency is poor. There was a problem.

JP 2010-234507 A JP 2012-206212 A JP 2013-154415 A

  In view of the above-mentioned problems, it is conceivable to cut the fiber reinforced plastic material using a tip saw having a relatively low cost and a high cutting speed. However, as described above, the fiber reinforced plastic may be carbon fiber, glass fiber, or the like. Because it is a composite material formed by mixing the filler in a matrix such as thermoplastic resin or thermosetting resin, burrs or fluffing on the cut surface or surface peeling during cutting is likely to occur during cutting operations. There is a problem.

Specifically, as shown in FIGS. 10 and 11, the tip saw 51 has an L-shape formed on the saw blade 53 with a saw blade 53 protruding from the outer periphery of the disc-shaped base metal 52 at a predetermined interval. Since the tip 55 having the cutting edge 56 protruding in the scooping direction is joined to the pedestal 54 by brazing, welding, or the like, the surface of the fiber reinforced plastic material W is cut by the cutting edge 56 of the tip 55 when the fiber reinforced plastic material W is cut. Since it is scraped up, fuzz and burrs are generated, and when the matrix is a thermoplastic resin, the matrix is welded to the blade edge 56 due to heat generated at the time of cutting, and as a result, the matrix becomes uncut.

  Further, in the tip saw 51, it is conceivable to reduce the above-mentioned problems related to the cutting of the fiber reinforced plastic by reducing the pitch of the saw blades 53. However, as shown in FIG. In the case of the chip saw 51, in order to obtain a sufficient bonding strength of the chip 55 at the time of bonding, it is necessary to form the heating temperature region H1 in a wide range at least from the pedestal 54 in the center direction. Is reduced, the outer peripheral portion of the base metal 52 becomes too hot, and the outer peripheral portion expands due to the thermal effect to cause plastic deformation.

Under the circumstances described above, it has been the actual situation that the tip saw has not been used for cutting fiber-reinforced plastics.

  An object of the present invention is to provide a chip saw for a composite material that can solve the above-mentioned various problems all at once and can cut a fiber-reinforced plastic material.

The present invention according to claim 1 is a tip saw in which saw blades are integrally extended with a predetermined interval on the outer periphery of a disk-shaped base metal, and a single chip is fixed to a pedestal formed on each saw blade. The tip has a staggered staggered staggered left end and right end, the flank of which is composed of an inclined surface that descends from the left end to the right end and an inclined surface that descends from the right end to the left end when viewed from the rotational direction side of the tip saw. The rake face of each chip is a negative angle inclined in the direction opposite to the rotation direction of the tip saw with respect to the center line extending from the center of the base metal in the outer peripheral direction. It has a square shape, the front side portion is a rake face, the top portion is a flank surface, the tip rear side portion and the tip bottom portion are fixed to a substantially L-shaped base, and the pitch between adjacent saw blades is 4 .For composite materials of 0 mm or more Is Ppuso.

According to a second aspect of the invention, the chip saw of claim 1, wherein, for the welding preventing composite material, in which the dehydrogenation-type DLC coating having a constant width is applied to the outer peripheral portion.

  According to the tip saw according to the first and second aspects of the present invention, since the tip fixed to the saw blade on the outer periphery of the base metal is a staggered blade, in the cutting portion of the composite material which is the work material Since the inner matrix is cut while always cutting the outer filler, it is possible to perform cutting without causing surface peeling. Moreover, in the tip saw of the present invention, the rake face of the tip has a negative angle inclined in the direction opposite to the rotation direction of the tip saw with respect to the center line extending from the center of the base metal in the outer peripheral direction. Depending on the cutting edge angle, there is a portion where the cutting edge cuts in a range of 75 ° to 105 ° with respect to a composite material such as CFRP (carbon fiber reinforced plastic) and cuts at 90 ° (right angle). As a result, the filler (fiber) does not peel off or fluff, and coupled with the continuous cutting action by the staggered blade described above, it is possible to cut sharply without missing the filler in the composite material. The special effect that cutting can be performed reliably is obtained.

  In short, the tip saw according to the present invention can reliably prevent the occurrence of burr and fluffing, surface peeling and clogging when cutting a composite material, which has been a problem in the past, with the saw blade configuration described above, Even if the material to be cut is CFRP, it can be cut smoothly with sharpness.

Composite material for tipped according to the present invention of claim 2, the composite material for chip saw of claim 1, wherein, by dehydrogenation type DLC coating having a constant width on the outer peripheral portion is applied, and the surface smoothness The friction coefficient during cutting can be reduced. Therefore, especially in the cutting of CFRP, which is a thermoplastic resin, it is possible to completely prevent the molten resin from welding to the cutting edge, and to obtain a clean cut surface without burrs, and as described above, the friction coefficient can be lowered. Therefore, the cutting heat itself generated at the cutting edge during cutting of the workpiece can be suppressed, thereby extending the tool life, preventing the plastic deformation of the base metal, and reducing the cutting ability for thermoplastics having a low melting temperature. Further improvements are possible. Further, according to the DLC coating, the friction coefficient is about 1/4 as compared with a generally applied PVD coating.

It is a side view which shows a part of chip saw concerning Embodiment 1 of the present invention. It is an enlarged view of the saw blade part in the chip saw of FIG. It is a perspective view of the saw blade part which shows the staggered blade in the same chip saw. It is a side view which shows a part of chip saw of Embodiment 2. It is an enlarged view of the saw blade part in the chip saw of FIG. It is a principal part enlarged front view which shows the cutting condition with the staggered-tip type | mold chip | tip in the same chip saw. It is a partial expanded side view which shows the heating range of the base metal part in the same chip saw. It is a side view which shows the cutting condition by the same chip saw. It is a side view which shows embodiment which gave DLC coating to the same chip saw. It is a side view which shows the cutting condition by the conventional tip saw. It is an enlarged view of the blade edge | tip part in the tip saw of FIG. It is a partial expanded side view which shows the heating range of the base metal part in the chip saw of FIG. It is a cut surface image of the cut material which shows the result of the cutting test by the conventional tip saw. It is a cut surface image of the cut material which shows the result of the cutting test by the tip saw of this embodiment.

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

  (Embodiment 1)

  As shown in FIGS. 1 to 3, in the composite material chip saw 1 according to the present embodiment, saw blades 3 are formed on the outer periphery of a disk-shaped base metal 2 at regular intervals, and formed on each saw blade 3. The chip 5 is fixed to the pedestal 4, the chip 5 is a staggered blade, and the rake face 5 a of each chip 5 is based on the center line CL extending from the center of the base metal 2 toward the outer periphery. The negative angle α is inclined in the direction opposite to the rotational direction A of 1.

  As shown in FIG. 2, the pedestal 4 is formed in a substantially L-shape when viewed from the side, on the saw blade 3 bulging outward.

As shown in FIGS. 2 and 3, the tip 5 has a substantially vertical rectangular shape and is inclined from one side to the other side of the base metal 2, and the adjacent cutting blades 3 have cutting edges B1 and B2 opposite to each other. The front side portion is the rake face 5a, the top portion 5b is a relief surface, the rear side portion 5c and the bottom portion 5d are joined to the pedestal 4, and the pitch P between adjacent saw blades is 4.0 mm. That's it.

(Embodiment 2)

  As shown in FIGS. 4 and 5, in the chip saw 21, saw blades 23 are formed at regular intervals on the outer periphery of the disk-shaped base metal 22, and the chips 25 are fixed to pedestals 24 formed on the respective saw blades 23. The tip 25 is substantially fan-shaped, and with the cutting edge B as the apex, the front radius portion 25a is a rake face, the rear radius portion 25b is a flank surface, and both the radius portions 25a and 25b are The convex arc portion 25c to be connected is fixed to the concave arc-shaped pedestal 24 formed on the outer periphery of the base metal 22 at a predetermined interval by welding or the like, and the adjacent saw blade pitch P is less than 4.5 mm. The rake face 25a has a negative angle α that is inclined in the direction opposite to the rotational direction A of the tip saw 21 with respect to the center line CL extending from the center of the base metal 22 in the outer circumferential direction.

  Further, each of the concave arc-shaped pedestals 24 in the tip saw 21 of the present embodiment has a shape that is recessed in the center direction from the outer periphery of the disc-shaped base metal 22, and the above-described substantially fan-shaped chip 25 is fixed to the pedestal 24. Thus, the blade chamber 26 is formed between the adjacent chips 25.

  Furthermore, the adjacent saw blade pitch P in the tip saw 21 is more preferably about 3.5 mm.

  As shown in FIG. 6, also in this embodiment, the tip 25 fixed to the saw blade 23 on the outer periphery of the base metal 22 is a staggered blade as in the first embodiment.

As shown in FIG. 7, in the tip saw 21, as described above, the tip 25 is substantially fan-shaped, the front radius portion 25a is a rake face, and the rear radius portion 25b is a relief surface. Since the convex arc portion 25c connecting the radius portions 25a and 25b is fixed to a concave arc-shaped pedestal 24 formed on the outer periphery of the base metal 22 at a predetermined interval, the chip 25 is joined when the chip 25 is joined. By heating the central portion of the base plate 22, the heat amount H 2 can be uniformly and efficiently applied to the concave arc-shaped base 24 of the base metal 22 via the convex arc portion 25 c of the chip 25. Impact is minimized.

  Therefore, as described above, in the tip saw 21, it is possible to reduce the adjacent saw blade pitch to about 3.5 mm.

  Further, as shown in FIG. 8, when cutting the composite material W such as CFRP with the tip saw 21 having the above-described configuration, the cutting edge of the composite material W is cut in a range of 75 ° to 105 °, and the tip is cut. Since there is a portion where the rake face 25a of 25 is cut at a right angle, the composite material W is cut while preventing separation of fibers in the composite material W at this portion.

Further, as shown in FIG. 6, when cutting the composite material W, the tip 25 is formed in a staggered shape, so that the left and right cutting edges B1 and B2 are alternately cut in a well-balanced and sharp shape. Since the cutting edges B1 and B2 cooperate to cut the filler (fiber) of the composite material W and further cut the matrix (resin), fluffing and surface peeling are completely prevented. Such a point is the same in the tip saw 1 of the first embodiment.

  As shown in FIG. 9, the tip saw 31 is obtained by applying a dehydrogenation type DLC (diamond-like carbon) coating 29 having a constant width on the outer peripheral portion of the tip saw 21 according to the present embodiment. Further, the coating 29 can be performed in the same manner in the tip saw 1 of the first embodiment.

(Cutting test)

  Next, a cutting test of CFRP was performed using the tip saws 1 and 21 of the above-described embodiment and the conventional tip saw 51 shown in FIGS. 10 and 11. As shown in FIG. Cut flecks were generated on the surface, and fluffing F and surface peeling E caused by scraping carbon fibers in CFRP were confirmed.

  On the other hand, as shown in FIG. 14, the tip saws 1 and 21 according to the embodiment have a clean cutting surface with no cut spots, and the cut CFRP, which is a material to be cut, has no burrs, fluffing, or surface peeling. I was not able to admit. Furthermore, in the tip saw 31 of the embodiment to which the dehydrogenation type DLC (diamond-like carbon) coating 29 was applied, the frictional resistance during the cutting was further significantly reduced.

  According to the tip saw of the present invention, cutting of a composite material such as thermoplastic CFRP, which has been impossible in the past, can be easily performed, and thus can be widely used.

1 Tip Saw 2 Disc Base 3 Saw Blade 4 Pedestal 4a Front End of Pedestal 4b Rear End of Pedestal 5 Tip 5a Rake Face of Chip α Rake Angle

Claims (2)

In a chip saw in which a saw blade is integrally extended with a predetermined interval on the outer periphery of a disk-shaped base metal, and a single chip is fixed to a pedestal formed on each saw blade, the chip has a relief surface, When viewed from the rotation direction side of the tip saw, the left end and the right end, which are composed of an inclined surface descending from the left end to the right end and an inclined surface descending from the right end to the left end, are alternately sharpened staggered blades, and the rake face of each tip Is a minus angle inclined in the opposite direction to the rotation direction of the tip saw with respect to the center line extending from the center of the base metal to the outer peripheral direction, and the tip is substantially square when viewed from the side, and the front side is scooped. For the composite material, the top part is a flank, the chip rear side part and the chip bottom part are fixed to a substantially L-shaped base, and the pitch between adjacent saw blades is 4.0 mm or more Tip saw.   The composite material chip saw according to claim 1, wherein a dehydrogenation-type DLC coating having a constant width is applied to an outer peripheral portion for preventing welding of the composite material.