JP2012056067A - Circular saw for cutting metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circular saw for cutting metal reducing friction against a material to be cut, effectively preventing chipping of a cutting blade tip, increase of cutting resistance, roughening of a cutting surface and the like, and drastically extending a life.SOLUTION: Blades 14 are formed at a predetermined pitch in the outer peripheral edge of a disk-like base metal 12, and the cutting blade tips 20 are securely attached respectively to respective blades 14. In both corner parts between an outer peripheral flank 30 of the cutting blade tip 20 and outer peripheral edges of lateral flanks 28 on both sides thereof, taper chamfers 34 are provided that are formed toward the rear side of respective blades 14 from both ends of a flank 24 with a space of 0.2-0.8 mm. The taper chamfers 34 are formed tapered so as to widen from the flank 24 side toward the front edge of the blade 14. Small chamfers 36 are formed between the taper chamfers 34 and both ends of the flank 24. Blade taper surfaces 38 are provided in both corner parts of the outer peripheral parts of the blades 14 extended from the taper chamfers 34.

Description

  The present invention relates to a circular saw for metal cutting used when cutting a metal material such as a steel material or a non-ferrous metal material.

  Conventionally, as this type of metal cutting circular saw, there is one in which a cutting edge tip is brazed to protrude radially outward on the outer periphery of a disk-shaped circular saw body. As described in Patent Documents 1 and 2, this circular saw includes blade bodies formed at a predetermined pitch along the outer peripheral edge of a disk-shaped base metal, and each blade body has a base metal chip. It consists of a cutting edge chip brazed to a seat.

  The cutting edge chip includes a substantially rectangular chip body, a rake face having a required rake angle formed on the front side of the top of the chip body, and a recess formed to be connected below the rake face. Further, on both sides of the chip body, a pair of lateral flank surfaces having a required lateral clearance angle, an outer peripheral clearance surface having a required clearance angle formed on the top of the chip body, and a rear end of the outer peripheral clearance surface. A chip dividing groove formed in the end direction, and a recess or a chamfered portion formed by cutting out a corner formed by the outer peripheral flank and the outer peripheral ends of both lateral flank surfaces are provided.

Japanese Patent Laid-Open No. 2002-1614 JP 2004-351578 A

  In the case of the chip body of the background art described above, the lateral clearance surfaces on both sides have a required clearance angle to reduce contact with the cut surface of the material to be cut, but the clearance angle is at most about 1 °, which is large. It is difficult to take, and the lateral clearance surface wears with time, and the contact area with the cut surface increases. When the contact area is increased, there is an increase in cutting resistance and a problem of heat generation, which tends to cause cracks and chipping due to wear and frictional heat of the cutting edge tip, and to significantly reduce the life of the circular saw. Furthermore, due to the difference in the contact state between the side flank surfaces of the cut surface caused by them, cutting occurs, which adversely affects the machining accuracy.

  Furthermore, in the case of the circular saw disclosed in Patent Document 1, a recess is provided on the outer peripheral end side of the side clearance surface to reduce cutting resistance, but the positioning of the end of the recess is not easy and is difficult to manufacture. is there.

  In the case of the circular saw disclosed in Patent Document 2, since the taper surface is formed over the entire length from the front end to the rear end of the corner where the outer peripheral flank face and the lateral flank face of the cutting edge tip intersect, There is a problem in that there is a cutting action in the lateral direction, cutting vibration is generated, and cutting traces due to vibration are easily generated on the cut surface, and the quality of the cut surface is deteriorated.

  The present invention has been made in view of the above problems of the background art, and reduces friction with the work material and effectively prevents chipping of the cutting edge tip, increase of cutting resistance, rough surface of the cutting surface, and the like. An object of the present invention is to provide a circular saw for metal cutting that can greatly extend the service life.

  The present invention is a metal sawing circular saw in which a blade body is formed at a predetermined pitch on the outer peripheral edge of a disk-shaped base metal, and a cutting blade tip is fixed to each of the blade bodies. Tapered chamfered portions formed at both corners formed by the outer peripheral flank face of the chip and the outer peripheral ends of the lateral flank faces on both sides of the chip from 0.2 to 0.8 mm from both ends of the rake face toward the rear of the blade body. The tapered chamfered portion is a circular saw for metal cutting that is formed in a tapered shape so as to spread from the rake face side toward the tip end portion of the blade body.

  Furthermore, a small chamfered portion is formed between the tapered chamfered portion and both ends of the rake face. Moreover, the blade body taper surface may be formed at both corners of the outer peripheral portion of the blade body extending from the taper chamfered portion.

  The circular saw for metal cutting of the present invention reduces the friction by reducing the contact between the work material and the side flank, suppresses the cutting resistance of the cutting edge tip, and greatly increases the life of the cutting edge tip and the circular saw. It can be extended. Further, cutting is prevented and the cut surface can be improved.

It is a partial expansion perspective view of the circular saw for metal cutting of one Embodiment of this invention. It is a top view (a), a front view (b), and a right side view (c) of a blade body part and a cutting edge tip of a circular saw for metal cutting of this embodiment. It is a partial enlarged front view of the circular saw for metal cutting of this embodiment. It is a partial expansion perspective view of the circular saw for metal cutting of other embodiment of this invention. It is a top view (a), a front view (b), and a right side view (c) of a blade body part and a cutting edge tip of a circular saw for metal cutting according to another embodiment.

  An embodiment of the present invention will be described below with reference to FIGS. A circular saw 10 for cutting metal according to this embodiment has blade bodies 14 formed at a predetermined pitch on the outer periphery of a disk-shaped base metal 12, and each blade body 14 has a chip seat cut out at a substantially right angle. 16 is provided, and a cutting edge tip 20 made of a cemented carbide is fixed to the tip seat 16 by brazing or the like.

  The cutting edge tip 20 is formed by being connected to a substantially rectangular chip body 22, a rake face 24 having a required rake angle formed on the top front side of the chip body 22, and a rake face 24 connected to the rake face 24. The concave portion 26 is provided. On both sides of the chip body 22, connecting to both ends of the rake face 24 and the recess 26, a laterally inclined side in a direction slightly approaching the radial center of the base metal 12 from a plane parallel to both side faces of the blade body 14. A flank 28 is provided.

  An outer peripheral flank 30 having a required clearance angle and a chip dividing groove 32 formed from the front end of the outer peripheral flank 30 toward the rear end are formed at the top of the chip body 22. Tapered chamfered portions 34 formed by cutting out in a tapered shape are formed at corners formed by the outer peripheral flank 30 and the outer peripheral ends of the lateral flank 28 on both sides thereof.

  The tapered chamfered portion 34 is formed about 0.2 to 0.8 mm from both ends of the rake face 24 toward the rear of the blade body, and extends from the rake face 24 side toward the distal end portion 14a of the blade body 14. It is formed in a taper shape. In a section of 0.2 to 0.8 mm between the rake face 24 and the chamfered portion 34, a small flat surface that is in contact with the envelope circle of the blade tip 14 a with respect to the plane of the tapered chamfered portion 34 is small. A chamfered portion 36 is formed. The small chamfered portion 36 has no taper, and its size may be in the range of 0.1 to 1.0 mm, preferably in the range of 0.2 to 0.8 mm, more preferably 0.4 to. The range is 0.6 mm. This is because if the dimension of the small chamfered portion 36 is smaller than 0.1 mm, horizontal cutting occurs at the left and right ends of the cutting edge, cutting vibration is likely to occur, and cutting traces accompanying the vibration are generated on the cutting surface. This is because the quality of the surface deteriorates. On the other hand, if the size is larger than 1 mm, chipping may occur in the vicinity due to friction on the outer peripheral end side of the lateral clearance surface 28, which is a defect in the absence of the tapered chamfer 34, or due to a difference in load in the saw thickness direction. There is a problem that cutting becomes easy to occur. Further, the end of the tapered chamfered portion 34 on the side of the widened portion is inclined with respect to the side surface of the base metal 12 from both corners of the tip 16 a of the tip seat 16 of the blade body 14 toward the rear of the blade body 14. The blade tapered surface 38 that spreads toward the rear of the blade 14 is formed to extend from the surface of the tapered chamfer 36 on the same surface.

  The spread angle of each taper chamfer 34 may be approximately 10 to 40 °, and preferably 15 to 30 °. When the spread angle of the taper chamfer 34 is less than 10 °, the contact between the work material and the side flank 28 increases and the friction increases, and the cutting edge due to wear of the cutting edge tip 20 or frictional heat. Chips 20 are likely to be chipped, and cutting is likely to occur due to rough cutting surfaces and increased cutting resistance due to them. Furthermore, it reduces the life of the circular saw. Further, when the spread angle of the taper chamfered portion 34 exceeds 40 °, the cutting edge of the cutting edge tip 20 becomes thin and the cutting edge tends to be chipped, which also reduces the life of the circular saw.

  The method of using this metal cutting circular saw 10 is the same as that of a known metal cutting circular saw, and it is set in a required cutting machine and rotated at a high speed by a conventional method, so that a required work material such as a steel material is obtained. Cut and cut.

  The circular saw for metal cutting 10 to which the cutting edge tip 20 of this embodiment is attached has a clearance angle toward the rear in the rotational direction at the portion where the pair of lateral clearance surfaces 28 and the outer peripheral clearance surface 30 of the chip body 22 intersect. Since the tapered chamfered portion 34 that is formed and spreads out is formed, the portion that abuts the cut surface of the work material at the time of cutting is limited to a certain range of the rake surface 24 and the lateral flank 28, and the lateral flank Friction between the workpiece 28 and the work material can be minimized. Thereby, cutting resistance due to friction during cutting can be suppressed, and heat generation can also be suppressed. As a result, it is possible to suppress the occurrence of thermal cracks on the rake face 24 and the like of the cutting edge chip 20 and to prevent chipping of the chip body 22 due to the thermal cracks. Further, since the blade tapered surface 38 is formed extending from the tapered chamfered portion 34, friction between the blade 14 and the work material can be suppressed, and heat generation at the blade 14 portion can also be suppressed.

  In addition, this metal cutting circular saw 10 can effectively prevent the occurrence of bending by improving the cutting surface accuracy and reducing the cutting resistance, and can significantly extend the life of the metal cutting circular saw 10. Also, with this structure, it is easy to regenerate the cutting edge by regrinding the cutting edge tip 20, and from this point of view, the life of the metal cutting circular saw 10 can be extended.

  The circular saw for metal cutting according to the present invention is not limited to the above embodiment, and as shown in FIGS. 4 and 5, the blade body taper surface 38 is not provided and the taper chamfered portion of the cutting blade tip 20 portion is provided. Only the portion 34 may be formed. This also provides the same effect as described above, and is particularly suitable for a small-diameter circular saw.

DESCRIPTION OF SYMBOLS 10 Metal cutting circular saw 12 Base metal 14 Blade body 16 Tip seat 20 Cutting blade tip 22 Chip body 24 Rake face 28 Side relief face 30 Outer circumference relief face 34 Taper chamfer 36 Small chamfer 38 Blade taper

Claims (3)

In a circular saw for metal cutting, in which a blade body is formed at a predetermined pitch on the outer peripheral edge of a disk-shaped base metal, and a cutting blade tip is fixed to each blade body,
At each corner formed by the outer peripheral flank face of each cutting edge tip and the outer peripheral edge of the lateral flank face on both sides thereof, 0.2 to 0.8 mm is formed from both ends of the rake face toward the rear of the blade body. A taper chamfered portion is provided, and the taper chamfered portion is formed in a tapered shape so as to spread from the rake face side toward the tip end portion of the blade body.   The circular saw for metal cutting according to claim 1, wherein a small chamfered portion is formed between the tapered chamfered portion and both ends of the rake face. The circular saw for metal cutting according to claim 1, wherein a tapered blade surface is formed at both corners of the outer peripheral portion of the blade body, extending from the tapered chamfered portion.

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