JP2008213117A - Rotating saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce consumption of a super hard sintered body forming the chip, a grinding amount of a blade of the chip, and a manufacturing cost of a rotating saw by improving a shape of a chip. <P>SOLUTION: A preceding chip (5) with narrow tooth width and high tooth depth and a following chip (6) with wider tooth width and lower tooth depth than those of the preceding chip (5) are formed of a super hard sintered body, then this preceding chip (5) and the following chip (6) are fixed to the outer periphery of a disk-like base metal with a space formed between them, and the preceding chip (5) is disposed in the center part of the following chip (6) in a tooth width direction. In the following chip (6), the tooth wide directional center part is recessed (6b) or removed so as to be overlapped on the preceding chip (5) in the rotation direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

 The present invention relates to a rotary saw having a chip formed of a super-hard sintered body such as a diamond sintered body (PCD) or a cubic boron nitride (CBN) sintered body, and in particular, the consumption of the chip and the blade The present invention relates to a rotary saw that can reduce the amount of polishing and reduce the manufacturing cost.

  Generally, as a rotary saw that has low cutting resistance and improves straightness during cutting, flat tooth chips and chevron chips with equal tooth widths are alternately arranged in the circumferential direction, and the top of the chevron chip is a flat tooth There is a rotary saw protruding from the center of the tip in the tooth width direction. Further, there is a chip formed of an ultra-hard sintered body such as a diamond sintered body (PCD) or a cubic boron nitride (CBN) sintered body in order to improve the wear resistance of teeth.

  Therefore, in order to reduce cutting resistance and improve straightness at the time of cutting, and improve the wear resistance of the blade, the flat tooth chip and the chevron chip are formed of an ultra-hard sintered body such as PCD or CBN. However, both the flat tooth chip and the chevron chip have the same tooth width and the size considering the amount of regrinding. By simply changing to a super-hard sintered body, the consumption of expensive super-hard sintered bodies increases, and the cutting edge becomes longer, resulting in an increased amount of polishing during production and an increased manufacturing cost.

In addition, the ultra-hard sintered body has wear resistance, but has low toughness, so it is easily damaged by impact during use. It will be replaced with a new one, and repair costs will increase.
Hideharu Sakai's “Chipsaw”, published by Sakai Shoten June 30, 1951 Utility Model Registration No. 31450503

  It is an object of the present invention to obtain a novel rotary saw that can reduce the manufacturing cost by reducing the consumption of the ultra-hard sintered body forming the chip and the polishing amount of the blade of the chip by improving the shape of the chip. And

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is formed of a super hard sintered body with a leading tip having a narrow tooth width and a high tooth height, and a succeeding tip having a tooth width wider than that of the preceding tip and a low tooth height. The preceding chip and the succeeding chip are fixed to the outer periphery of a disk-shaped base metal at intervals in the circumferential direction, and the preceding chip is disposed at the center in the tooth width direction of the subsequent chip.
According to a second aspect of the present invention, the center portion in the tooth width direction that overlaps the preceding tip in the rotational direction is notched or removed from the succeeding tip.
According to a third aspect of the present invention, the leading tip is a front leading tip having a narrow tooth width and a high tooth height, and a trailing leading tip having a tooth width wider than that of the leading leading tip and having a low tooth height. In addition to being arranged at intervals in the circumferential direction, the preceding preceding tip is arranged at the center in the tooth width direction of the succeeding preceding tip.
According to a fourth aspect of the present invention, the preceding chip and the subsequent chip are fixed to a base metal through a base made of cemented carbide.

In the invention according to claim 1, the leading tip cuts the central portion in the width direction of the groove, and then the trailing tip cuts both sides in the width direction of the groove. For this reason, the tooth portion does not easily roll during cutting, and the straightness is improved, and the leading tip and the following tip share the cutting of the bottom portion of the groove, so that the cutting resistance is reduced. Further, since the leading tip has a tooth width for cutting the central portion in the width direction of the groove, the leading tip becomes small and the consumption of the ultra-hard sintered body forming the leading tip is reduced. In addition, the tip of the leading tip is narrowed and the length of the cutting edge of the tip is shortened. This part can be polished quickly, and the consumption of the grindstone can be reduced to achieve high-precision polishing. It will be.
In the invention according to claim 2, since the tip cutting edge does not exist in the center portion of the subsequent tip in the tooth width direction, the tip cutting edge of the subsequent tip is polished only on both sides in the tooth width direction. For this reason, the tip cutting edge can be polished quickly and with high accuracy.
In the invention according to claim 3, since the preceding tip is a combined tooth of the preceding leading tip and the trailing leading tip having different tooth widths and heights, the straightness at the time of cutting and the reduction of cutting resistance are further improved. become.
In the invention according to claim 4, the leading tip and the trailing tip made of an ultra-hard sintered body can be firmly fixed to the outer peripheral portion of the base metal.

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a partial side view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, FIG. 3 is a sectional view taken along the line III-III in FIG. -IV sectional view, FIG. 5 is a VV sectional view of FIG. 4, FIG. 6 is an explanatory front view showing the overlapping state of the preceding chip and the succeeding chip according to the first embodiment of the present invention, and FIG. It is a front view for description which shows the overlap state of the preceding chip | tip and a subsequent chip | tip by an Example.

  1 to 5, reference numeral 1 denotes a disposable rotary saw for cutting a high silicon aluminum alloy material so that a chip made of a super-hard sintered body having high wear resistance is made as small as possible to reduce manufacturing costs. It is a thing. In this example, the rotary saw 1 has an outer diameter of about 355 mm, the number of teeth 40, and the thickness W1 of the base metal 2 is about 3.5 mm. The base metal 2 is formed in a disk shape by alloy tool steel (JIS standard; SKS5), and 40 sawtooth-shaped blade bases 3 are formed at the outer circumferential portion at equal or irregular pitches in the circumferential direction. Via a pedestal 4, a high-tooth chevron-shaped leading tip 5 and a low-tooth flat-toothed succeeding tip 6 are alternately arranged in the circumferential direction and fixed to the blade base 3.

  The pedestal 4 is made of a cemented carbide (JIS standard; K20), and is formed in a rectangular parallelepiped shape as shown in FIGS. It is placed on the stepped portion 3a and fixed by brazing with a silver solder or the like. The pedestal 4 has a left and right width W2 of the base portion 4a of about 4 mm, a left and right width W3 of the tip portion 4b of about 5.4 mm, and an L-shaped placement portion in which the leading tip 5 is brazed and fixed to the tip portion 4b. 4c is formed. The pedestal 4 is brazed and fixed to each blade base 3 after brazing the leading tip 5 to the mounting portion 4c.

  The leading tip 5 is made of an ultra-hard sintered body such as a diamond sintered body (PCD) or a cubic boron nitride (CBN) sintered body, and has a tooth width (tooth thickness) T2 of about 2.7 mm and a tooth height H2. Is about 1.5 mm, the left and right corner angles K1 are about 35 degrees, the tip clearance angle C2 is about 10 degrees, and the rear clearance angle C1 is about 15 degrees. It is placed at the center and fixed by brazing with a brazing material having a high melting point, for example, nickel brazing.

  As shown in FIGS. 4 and 5, the succeeding tip 6 is made of the same super-hard sintered body as the preceding tip 5, and the tooth width (tooth thickness) T <b> 1 is about 5 mm and the tooth height H <b> 1 is the tooth of the preceding tip 5. About 1.2mm slightly lower than the height H2, side clearance angle S1 is about 1 degree, left and right corner angle K1 is about 35 degrees, tip clearance angle C2 is about 10 degrees, rear clearance angle C1 is about 15 degrees In addition, a recess (notch) 6b is formed at the center in the tooth width direction on the upper surface, and the groove width L1 of the recess 6b is about 2.1, which is slightly narrower than the tooth width T2 of the preceding tip 5. It has become. Note that the succeeding chip 6 may be configured to remove the central portion in the tooth width direction corresponding to the concave portion 6b.

  The clearance angle C1 at the rear portion of the preceding tip 5 and the succeeding tip 6 is for reducing the polishing of the clearance angle C2 at the tip portion where the ultra-hard sintered body exists. In addition, the dimension, angle, etc. of each part mentioned above are suitably set with the material etc. of a cut material. Further, the corner angles K1 and K2 may be omitted depending on a cut object.

  FIG. 6 is an explanatory front view showing an overlapping state of the preceding chip 5 and the succeeding chip 6 when viewed from the front side in the rotational direction, and M1 is a protruding amount of the preceding chip 5 with respect to the succeeding chip 6, and the protruding amount M1 is about 0.3 mm. P1 is an overlap amount in which the preceding chip 5 and the subsequent chip 6 overlap in the rotation direction, and the overlap amount P1 is about 0.3 mm.

  FIG. 7 shows a second embodiment. In FIG. 7, reference numeral 4 denotes a pedestal, and 6 denotes a subsequent chip, which have substantially the same structure as the pedestal 4 and the subsequent chip 6 in the first embodiment described above. Reference numeral 5-1 denotes a preceding preceding chip, and 5-2 denotes a succeeding preceding chip. The rear-stage leading tip 5-2 is formed with a recess (notch) 5c that is slightly narrower than the tooth width of the front-stage leading chip 5-1, at the center in the tooth width direction on the upper surface. The tooth width, tooth height, corner angle, etc. of the latter leading tip 5-2 are substantially the same as the tooth width T2, tooth height H2, corner angle K1 of the preceding tip 5. In addition, you may make it the said back | latter stage precedent chip | tip 5-2 remove the tooth width direction center part corresponded to the said recessed part 5c.

  The preceding leading tip 5-1 has a tooth width T3 of about 1 mm, a tooth height of about 0.3 mm higher than the trailing leading tip 5-2, and a mountain shape having a corner angle of about 35 degrees on the left and right. .

  According to the embodiment, when the workpiece is cut, after the leading tip 5 cuts the central portion in the width direction of the groove, the trailing tip 6 cuts both sides in the width direction of the groove, The narrow leading tip 5 exhibits a guide function, and the tooth portion does not easily roll when cutting, and straightness is improved. Further, since the leading tip 5 and the trailing tip 6 share the cutting of the bottom of the groove, the chips become small pieces and the cutting resistance is reduced.

  In addition, since the preceding tip 5 is small, the consumption of the ultra-hard sintered body forming the tip 5 can be reduced, and the length of the tip cutting edge 5a is shortened, so that this portion can be polished quickly. In addition, the consumption of the grindstone is reduced and high-precision polishing can be performed. Further, since the concave portion 6b having a width that overlaps the leading tip 5 in the rotational direction is formed in the center portion of the trailing tip 6 in the tooth width direction, the leading edge 6a of the trailing tip 6 is only on both sides in the tooth width direction, The length of the leading edge 6a is shortened, and further, the height H1 of the succeeding tip 6 is about 1.2 mm with respect to the conventional height of 5 mm to 6 mm. The polishing of the part can be performed quickly and with high accuracy.

  In addition, since the leading tip 5 is the preceding leading tip 5-1 and the trailing leading tip 5-2 having different tooth widths and heights, the leading edge of the leading leading tip 5-1 having a narrow tooth width and a high tooth height. The length of 5b is further shortened, and the straightness at the time of cutting is further improved, and the cutting resistance is reduced.

  Further, since the leading tip 5 and the trailing tip 6 are fixed to the base metal 2 via the base 4, the base 4 is attached to both the chip made of super hard sintered body and the base 2 made of alloy tool steel. By using a material that can be brazed firmly, such as a cemented carbide (JIS standard; K20), the preceding chip 5 and the subsequent chip 6 can be firmly fixed to the base metal 2. In the present invention, a plurality of sets of two or more kinds of chip sets (preceding chips and succeeding chips) whose tooth widths are sequentially reduced and tooth heights are sequentially increased may be attached to the outer periphery of the base metal 2.

It is a partial side view which shows 1st Example of this invention. It is II-II sectional drawing of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. It is a front view for description which shows the overlapping state of a preceding chip and a succeeding chip. It is a front view for description which shows the overlap state of the leading chip and the succeeding chip according to the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating saw 2 Base metal 3 Blade base 3a Step part 4 Base 4a Base part 4b Tip part 4c Placement part 5 Leading tip 5-1 Front stage leading tip 5-2 Rear stage leading chip 5a (5b) Tip cutting edge 5c Recessed part )
6 Subsequent insert 6a Tip cutting edge 6b Concave part (notch)

Claims (4)

  A leading tip having a narrow tooth width and a high tooth height and a succeeding tip having a tooth width wider than that of the leading tip and a lower tooth height are formed of a super-hard sintered body, and the outer periphery of the disk-shaped base metal A rotary saw characterized in that a leading tip and a trailing tip are fixed at intervals in the circumferential direction, and the leading tip is disposed at a center portion in the tooth width direction of the trailing tip.   2. The rotary saw according to claim 1, wherein the succeeding tip is formed by notching or removing a central portion in the tooth width direction which overlaps the preceding tip in the rotation direction.   The leading tip has a front leading tip with a narrow tooth width and a high tooth height, and a trailing leading tip with a wider tooth width and a lower tooth height than the preceding leading tip, and is arranged at intervals in the circumferential direction. The rotary saw according to claim 1 or 2, wherein the preceding leading tip is arranged at a center portion in the tooth width direction of the trailing leading tip.   The rotary saw according to any one of claims 1, 2, and 3, wherein the leading tip and the trailing tip are fixed to the base metal via a base made of cemented carbide.

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