JP6376653B2 - Circular saw for metal cutting - Google Patents

Description

  The present invention relates to a metal saw circular saw used for cutting a metal material such as a steel pipe.

  In general, a circular saw for metal cutting has a saw blade protruding from the outer periphery of a disk-shaped base metal at a predetermined interval, and a chip is fixed to a pedestal formed on the rotational direction side of the saw blade.

  And the circular saw which has the basic structure mentioned above has what has various technical characteristics in order to aim at improvement of cutting performance, prolongation of life, etc.

  Specifically, the cutting edge tip provided with an outer peripheral flank with a positive outer flank and a lateral flank with a 0 ° lateral flank is radially outward from the outer periphery of the disk-shaped circular saw body. In the circular saw for metal cutting that is joined to the blade body protruding in the direction by brazing or the like, the corner portion formed by the outer peripheral flank face and the lateral flank face of the cutting edge tip is on the rake face side of the lateral flank face What provided the hollow extended in the rotation back from the position 0.1-1.0 mm away from the outer periphery end is known.

  Further, in a circular saw for metal cutting in which a saw blade is formed at a constant interval on the outer periphery of the disk-shaped base metal, and the chip is fixed to the saw blade, the lateral flank face of the chip is the first flank face and the second flank face. The first flank is provided with a predetermined width from the front edge of the lateral flank to the rear, the second flank is provided behind the first flank, and the thickness direction of the base metal The first flank is formed by abutting a cup grindstone on both sides of the tip, and the second flank has ring grindstones on both sides of the tip. Also known is a concave arc formed by contact.

  Further, in a circular saw for metal cutting in which a saw blade is formed at a constant interval on the outer periphery of the disk-shaped base metal, and the chip is fixed to the saw blade, the lateral flank face of the chip is the first flank face and the second flank face. The second flank is divided from the upper edge to the lower edge in the radial direction of the base metal, and is formed from the rear edge to the front edge portion in the longitudinal direction of the chip. It is also known that the remaining portion is the first flank, and the second flank is formed with a height in the thickness direction of the base metal lower than that of the first flank.

Japanese Patent Laid-Open No. 2002-1614 Japanese Patent No. 4702804 JP 2011-93092 A

  Among the above-described conventional examples, the corner portion formed by the outer peripheral flank face and the lateral flank face of the cutting edge tip is based on a position 0.1 to 1.0 mm away from the outer peripheral edge of the rake face side of the lateral flank face. The one provided with a recess extending rearward of the rotation suppresses the occurrence of chipping due to thermal cracks in the vicinity of the corner portion of the cutting edge tip, and the thickness of the saw that the outer peripheral edge of the lateral flank face receives from the workpiece cutting surface in each cutting edge tip. Although it has the advantage that the lateral load in the direction can be reduced, the effect of the depression is limited.

  Next, according to the circular saw for metal cutting in which the first flank is formed by the cup grindstone and the second flank is formed by the ring grindstone, various excellent cutting performances can be obtained. This was premised on polishing with each grindstone.

  Further, the lateral flank face of the chip is divided into a first flank face and a second flank face, and the second flank face is formed halfway from the upper edge to the lower edge in the radial direction of the base metal. In the case of a metal cutting circular saw that is formed from the rear edge to the front edge portion with respect to the direction and the remaining portion is the first flank, the predetermined processing is performed in the same manner as in the case where the corner portion has a depression. Since accuracy and labor are required, there is an inconvenience that the skill of processing is required for the producer.

  An object of the present invention is to provide a circular saw for metal cutting which is not limited in the effect of improving the machinability, and does not require high skill in manufacturing, and can be manufactured easily and inexpensively. It is in.

According to the first aspect of the present invention, there is provided a metal cutting tool in which saw blades are projected at regular intervals on the outer periphery of a disk-shaped base metal, and chips are fixed to a pedestal formed on a side surface in the rotational direction of the saw blade. In a circular saw, the lateral flank face of the chip is divided into a first flank face on the upper stage and a second flank face on the lower stage through a step formed over the entire length, and the first flank face is separated from the front edge of the lateral flank face. The second flank is formed from the step to the trailing edge of the lateral flank, the width of the first flank is 0.2 to 0.6 mm, and the step is 0.02 to 0. 0.07 mm .

According to a second aspect of the present invention, in the circular saw for cutting metal according to the first aspect, a step is formed near a front edge of the side flank of the chip, and the first flank is a front edge of the side flank. To the front edge portion, and the second flank is formed in a wide range from the front edge portion to the rear edge of the lateral flank surface.

According to a third aspect of the present invention, in the circular saw for metal cutting according to the first or second aspect, the width of the first flank is 0.3 to 0.4 mm and the step is 0.03 to 0.05 mm. In particular, stable performance can be obtained .

According to a fourth aspect of the present invention, in the circular saw for metal cutting according to any one of the first to third aspects, an inclined surface and an inclined surface in which a rake face of the front surface of the chip extends in an outer edge direction. The entire length of the corner that is composed of a concave arc-shaped curved portion extending inward from the inside and a jaw portion formed inward of the curved portion, and where the upper edge of the side flank of the tip intersects with both edges of the tip flank A chamfer is formed on the surface .

According to a fifth aspect of the present invention, in the circular saw for metal cutting according to any one of the first to fourth aspects, the jaw portion projects into the blade chamber on the front side.

  In the circular saw for metal cutting according to the first aspect of the present invention, since the first flank on the upper side of the lateral flank of the tip of each saw blade is formed over the entire length of the tip, the first flank Makes stable contact with a metal workpiece such as a steel pipe with a small contact area, so that cutting with low cutting resistance is possible, and the wear on the side flank is greatly reduced. In addition, the cutting surface of the material to be cut is also a smooth surface, so that no burr is generated and the deburring operation is omitted, and a high peripheral speed (800) is obtained when cutting a steel pipe or the like. Therefore, the work efficiency can be greatly improved as compared with the conventional case.

Further, the circular saw for metal cutting of the present invention has a long life and can be thinned with the improvement of the overall cutting performance as described above, and can also save power when cutting a metal material. Have various practical advantages.

Moreover, according to the circular saw for metal cutting according to the present invention of claim 2 or less, the various effects described above can be further enhanced.

In addition, the above-described various effects are more prominent than the conventional circular saw for cutting with a metal having a multi-sided lateral relief surface, and high skill is required in manufacturing. Not easily obtained.

It is the expansion perspective view which looked at the saw-blade part of the circular saw for metal cutting which shows embodiment of this invention from back. It is a partial expanded side view which expands and shows a part of outer periphery in the circular saw of the same embodiment. It is a partial enlarged plan view which expands and shows a part of outer periphery in the circular saw of the embodiment. In the circular saw of the same embodiment, it is an enlarged front view of the saw blade portion viewed from the rotation direction side. It is the expansion perspective view which looked at the saw blade part in the circular saw of the embodiment from the front. It is an enlarged front view of the saw blade part which shows embodiment of the circular saw which has the chip | tip chamfered. It is the expansion perspective view which looked at the saw-blade part which concerns on other embodiment from the front. In the circular saw of the same embodiment, it is an enlarged front view of the saw blade portion viewed from the rotation direction side. It is a graph which shows the relationship between the wear area in a side flank, and the number of cuts. It is an image which shows the test result of the circular saw which concerns on a comparative example, Comprising: (a) shows the horizontal relief surface of the circular saw by 1000 cuts, (b) shows the cut surface of the pipe by the same cut. It is an image which shows the test result of the circular saw which concerns on embodiment, Comprising: (a) shows the horizontal flank face of the circular saw in 1000 cuts, (b) shows the cut surface of the pipe in the same cut. It is an image which shows the test result of the circular saw which concerns on embodiment, Comprising: (a) shows the side relief surface of the circular saw in 8000 cut, (b) shows the cut surface of the pipe in the same cut. In the circular saw according to the embodiment, it is a graph showing the relationship between the number of chip defects and the number of cuts of the work material in relation to the width of the first flank. In the circular saw concerning an embodiment, it is a graph which shows the relation between the number of chip | tip defect generation | occurrence | production in relation with a level | step difference dimension, and the number of cuts of a workpiece.

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

  In the present specification, front, rear, left and right are based on FIG. 2, and the front means the rotation direction (arrow A direction) of the circular saw 1 and the rear means the opposite side. Further, the left indicates the front side of the drawing sheet of FIG. 2, and the right indicates the back side of the drawing sheet.

As shown in FIGS. 1 to 3, in the circular saw 1 for cutting metal according to the present embodiment, a saw blade 3 protrudes from the outer periphery of a disk-shaped base metal 2 at a predetermined interval. A chip 5 is fixed to a base 4 formed on the front side (side surface in the rotation direction A) by brazing or the like.

Then, the lateral flank 6 of the tip 5 in the metal cutting circular saw 1 is connected to the upper first flank 7 and the lower tier via a step 10 formed over the entire length (the radial length of the circular saw 1). The first flank 7 is formed from the front edge of the side flank 6 to the rear step 10 thereof, and the second flank 8 is formed from the step 10 to the rear edge of the side flank 6. It is a flat surface that extends to

Further, in the present embodiment, the step 10 is formed in the portion near the front edge of the side flank 6 of the chip 5, and the first flank 7 is in a narrow range from the front edge of the side flank 8 to the portion near the front edge. The second flank 8 is formed in a wide range from the portion near the front edge of the lateral flank 6 to the rear edge, and the first flank 7 and the second flank 8 extend in the circumferential direction. The surfaces are parallel to each other.

As shown in FIGS. 2 to 5, the rake face 13 on the front surface of the chip 5 has an inclined surface 13a having a predetermined width W1 extending in the outer edge direction, a concave arc-shaped curved portion 13b extending inward from the inclined surface 13a, and a curved portion 13b. It is comprised by the jaw part 13c formed inward.

As shown in FIGS. 1, 2, and 5, in this embodiment, in the blade chamber 11 between the adjacent saw blades 3 on the outer periphery of the metal cutting circular saw 1, the jaw portion 13 c of the tip 3 is It has a structure protruding to the front side.

As shown in FIG. 1 and FIGS. 3 to 5, chip breaking grooves 9 </ b> A and 9 </ b> B extending in the front-rear direction are formed on the tip flank 12 of the chip 5. The chips 5 of the adjacent saw blades 3 on the outer periphery of the circular saw 1 are formed to be alternately left and right.

As shown in FIG. 4, the chip 5 has a predetermined set angle α on the left and right lateral relief surfaces 6.

Next, the manufacturing method of the circular saw 1 for metal cutting according to the present embodiment will be described. First, the chip 5 molded in the predetermined shape is fixed to each base 4 on the outer periphery of the base metal 2, and then the round The saw 1 is rotated and the first flank 7 of the tip 5 is rotated sideways for polishing.

As shown in FIG. 6, in the circular saw 1 for metal cutting according to the present embodiment, a chamfer 23 is formed at a corner where the upper edge of the side flank 6 of the chip 5 intersects with both side edges of the tip flank 12. There is also.

As shown in FIGS. 7 and 8, the metal cutting circular saw 21 is another embodiment of the metal cutting circular saw 1 described above, and the tip flank 32 of the tip 25 extends from the central portion in the left-right direction. Since it is comprised by the inclined surfaces 32A and 32B which each descend | fall, and the other part is the same as that of the circular saw 1 for metal cutting which concerns on the said embodiment, description is abbreviate | omitted by attaching | subjecting the respectively same code | symbol.

(Cutting performance test)

  Next, the circular saw 1 according to the embodiment described above and the circular saw according to the comparative example in which the lateral relief surface in which the step 10 is not formed on the lateral relief surface 6 of the metal cutting circular saw 1 are flush with each other are carried out. The cutting test performed will be described.

  As a common specification, a circular saw for metal cutting of φ260 × 2.0 (1.7) × 25.4H × 180Z, with a base metal equivalent to SKS5 and a tip equivalent to cermet P30, saw blade peripheral speed 800 m / min The cutting of a square pipe of material STKR400, 50 mm × 50 mm × 2.3 mm (t), was performed under cutting conditions with a feed rate of 10500 mm / min.

  The results are as shown in Table 1 and the graph of FIG. 9. Specifically, in the circular saw of the comparative example described as “rotating polishing”, the wear of the side clearance surface progresses very quickly, and 1000 Until the cutting, burning and a large number of burrs were generated on the cut surface of the square pipe, which forced the cutting to be stopped. On the other hand, in the circular saw 1 according to the embodiment described as “step flat”, the wear width and the wear area are very small compared to the comparative example, and good cutting results are obtained in all of 500 cuts to 8000 cuts. was gotten. Further, FIG. 10A is an actual photographed image of the lateral clearance surface at the 1000 cut in the circular saw of the comparative example, and the progress of wear is remarkably shown, and FIG. 10B is the same circle. Although it was a cut surface of 1000 cuts by a saw, it was a very rough surface state, and many burrs were observed.

  On the other hand, FIG. 11 (a) is an actual image of the lateral clearance surface at 1000 cuts in the circular saw 1 according to the embodiment of the present invention, and FIG. 12 (a) is an actual image of the lateral clearance surface at 8000 cuts in the circular saw 1. In any case, it is clear that the progress of wear is suppressed as compared with the circular saw of the comparative example, and the pipe cut surfaces of FIGS. 11 (b) and 12 (b) also show the comparative example. Compared with FIG. 10B using a circular saw, the cut surface is clearly better.

  Next, when a defect test related to the width W2 of the first flank 7 and the dimension LD of the step 10 in the circular saw 1 for metal cutting of the present embodiment was performed, first, regarding the width W2 of the first flank 7 As shown in FIG. 13, chipping of chip 5 was suppressed up to 3000 cuts at 0.3 mm, and chipping of chip 5 was revealed up to 1000 cuts at 0.15 mm. In addition, as shown in FIG. 14, for the step LD, the suppression of defects was clearly recognized at both 0.02 mm and 0.05 mm.

  And as a result of repeating a test, about the width W2 of the 1st flank 7, the effect of defect | deletion suppression can be confirmed in the range of 0.2-0.6 mm, and also in the range of 0.3-0.4 mm. Was more stable. Moreover, about the level | step difference LD, the effect of defect | deletion suppression was confirmed in the range of 0.02-0.07 mm, and also it was more stable in the range of 0.03-0.05 mm.

  As described above, the circular saw for metal cutting according to the present invention has excellent cutting performance and long life, and can be easily manufactured as compared with the conventional one, so that it is widely used in the field of cutting metal materials such as steel pipes. Can be used.

DESCRIPTION OF SYMBOLS 1 Circular saw for metal cutting 2 Base metal 3 Saw blade 4 Base 5 Tip 6 Lateral flank 7 First flank 8 Second flank 10 Level difference

Claims (5)

In a circular saw for metal cutting in which a saw blade protrudes from the outer periphery of a disk-shaped base metal at a predetermined interval, and the chip is fixed to a base formed on a side surface in the rotational direction of the saw blade, Is divided into an upper first flank and a lower second flank through a step formed over its entire length, and the first flank is formed from the front edge of the lateral flank to the step behind it, The two flank surfaces are formed from the step to the trailing edge of the lateral flank surface, and the width of the first flank surface is 0.2 to 0.6 mm and the step is 0.02 to 0.07 mm . Circular saw for metal cutting.   A step is formed near the front edge of the side flank of the chip, the first flank is formed in a narrow range from the front edge of the side flank to the front edge, and the second flank is The circular saw for metal cutting according to claim 1, wherein the circular saw is formed in a wide range from a front edge portion to a rear edge. The first flank has a width of 0.3 to 0.4 mm and a step of 0.03 to 0.05 mm, and the tip flank of the tip is composed of inclined surfaces that descend from the central portion in the left-right direction. The circular saw for metal cutting according to claim 1 or 2, wherein The rake face on the front surface of the chip is composed of an inclined surface extending in the direction of the outer edge, a concave arc-shaped curved portion extending inwardly from the inclined surface, and a jaw portion formed inward of the curved portion , and a lateral clearance surface of the chip The circular saw for metal cutting according to any one of claims 1 to 3 , wherein a chamfer is formed at the entire length of a corner portion where the upper edge and both side edges of the tip flank face .   The circular saw for metal cutting according to any one of claims 1 to 4, wherein the jaw portion protrudes into the blade chamber on the front side thereof.