JP2008105130A - Structure of cutting edge of tip saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein a tip saw to be used to cut off a steel pipe and a bar material is a milling cutter type in general so as to improve the durability of the saw, but this type of tip saws does not easily cut into a circular workpiece, and requires a long time period for cutting, and further its cutting edge quickly deteriorates. <P>SOLUTION: In the milling cutter type tip saw, a large number of hard tips are fixed to the circumferential portion of a disk having a shaft bore, and the hard tips are provided with cutting edges formed so as to be in parallel with the axis of the shaft bore. The cutting edges are composed of a first cutting edges left at the central portion in the direction of the width of the saw, and second cutting edges chamfered with a small chamfering angle so as to reduce their height from both end portions of the first cutting edges outward in the direction of the width of the saw. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a milling-type tip saw suitable for cutting a steel pipe, and more particularly to an improvement in the shape of the cutting edge.

  In general, a cutting machine 50 used for cutting a material having a circular cross section (hereinafter simply referred to as a material tube) such as a circular tube such as a stainless steel tube or a steel tube, or a solid round bar is shown in FIG. The clamp means 52 and the support arm part 54 that supports the tip saw 53 and is rotatably supported in the direction of the clamp means 52 are mounted on the support base 51. The material tube 55 is fixed to the support base 51 by the clamp means 52, the support arm portion 54 is rotated downward from above, and the tip saw 53 is pressed against the outer surface of the material tube 55 to be cut.

  Conventionally, when the tip saw 53 cuts a round bar or a circular tube as the material tube 55, the outer end of the blade edge is ground in parallel with the axis in order to improve the surface roughness of the end surface of the steel tube obtained by cutting. A so-called milling type tip saw 53 is often used. As shown in FIG. 5, the shape of the hard tip 56 that forms the cutting edge of the milling-type tip saw 53 has a cutting edge 56a ground in parallel with the axis of the rotation axis, and is small at 45 degrees at both corners of the cutting edge 56a. The chamfers 56b and 56b are provided so as to increase the durability of the cutting edge. In addition, 56c is a cutting groove escape groove (refer patent document 1).

  However, in the cutting by the milling type tip saw 53, when cutting a material having a circular outer surface such as a round bar or a circular tube, the relationship between the material tube 55 and the blade edge 56a that are in contact with each other is parallel, and the blade edge 56a and the material are cut. Since the contact length with the tube 55 is large, it may slip without biting into contact with each other and promote wear of the cutting edge or increase the cutting resistance.

  In addition, since both ends of the blade edge are chamfered at an angle of approximately 45 degrees, there is an advantage that the blade edge angle is increased and the durability of the blade is increased, compared to the case where the blade edge is used without chamfering, but the tube member has a large advantage. The cut resistance was only slightly improved.

To avoid such problems, it is effective to reduce the width of the blade edge or increase the upper angle of the blade edge. On the other hand, if the width of the blade edge is reduced, the rigidity of the blade edge decreases. It was expected that the tip of the cutting edge would easily fall off due to a slight swing of the saw, or that the blade life would be shortened.
Registered Utility Model No. 3088953

  The problem to be solved by the present invention is to reduce the large cutting resistance to the material pipe when trying to cut the pipe member using the milling type tip saw, and to reduce the large cutting resistance, the width of the cutting edge is reduced. The object is to obtain a cutting edge structure that minimizes the reduction in the cutting edge life that tends to occur when trying to reduce and does not reduce the surface roughness of the cutting surface of the product obtained by cutting.

  The present invention provides a milling-type tip saw in which a large number of hard tips are attached to the peripheral portion of a disc having a shaft hole, and the hard tip is provided with a blade tip formed in parallel to the axis of the shaft hole. It is mainly composed of a first cutting edge left in the part and a second cutting edge chamfered at a shallow chamfering angle that decreases in height from both ends of the first cutting edge outward in the width direction. Features.

  The cutting edge structure of the tip saw according to the present invention can extend the life of the cutting edge without adversely affecting the surface roughness of the product obtained by cutting the material tube. In addition, there is an advantage that the cutting resistance of the milling type tip saw with respect to the material pipe can be reduced to enable rapid processing.

  Hereinafter, a chip saw which is an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 10 is a chip saw. The tip saw 10 is attached with a number of hard tips 15 by brazing, laser beam welding, or other welding on the peripheral edge of the disc 12 having the shaft hole 11 as in the prior art. The hard chip 15 includes two types of a left-hand 15a and a right-hand 15b, which are composed of two pairs attached alternately to the peripheral edge of the disk 12. Reference numerals 13 and 13 denote mounting holes.

  The left-hand 15a and the right-hand 15b of the hard tip 15 are determined by the position of a relief groove 16c provided in the circumferential direction on the outer peripheral surface in order to promote the removal of cutting waste. That is, when the hard chips 15 are aligned in the same direction, the difference is in whether the escape groove 16c is on one side or the other side with respect to the center in the width direction, and the remaining part is formed in the same shape. ing. The basic configuration of the tip saw 10 described above and the shape of the hard tip 15 are not significantly different from those commercially available.

  As shown in FIGS. 2 to 4, the hard tip 15 according to the present invention has a cutting edge 16 attached to the peripheral edge of the disk 12 at a position parallel to the axis of the shaft hole 11. The shape of the cutting edge 16 of the hard tip 15 is composed of a first cutting edge 16a formed at the center in the width direction and second cutting edges 16b and 16b provided on both sides thereof. The second cutting blades 16b and 16b are subjected to shallow chamfering that decreases in height from both ends of the first cutting blade 16a toward the side in the width direction. The angle λ is the shallow chamfer chamfer angle.

  The widths of the first cutting edge 16a and the second cutting edges 16b and 16b are substantially the same, and the width of the cutting edge 16 is roughly divided into three parts by them. Therefore, the first cutting edge 16a located at the center has a sharp shape with a shorter length in the width direction of the cutting edge 16 than the conventional tip 53 shown in FIG. Therefore, the cutting edge 16 can easily bite into the material tube 55, and the cutting resistance during cutting is small, so-called a well-cut state and excellent straightness can be obtained.

  Since the second cutting edge 16b is continuously formed at both sides of the first cutting edge 16a at the shallow chamfering angle λ, the second cutting edge immediately after the first cutting edge 16a bites into the material tube 55. Since 16b acts as the cutting edge 16, an excessive load does not act on the first cutting edge 16a. Therefore, the durability of the tip saw 10 is not impaired although the sharpness is improved.

  Since the second cutting edge 16b does not have the chamfer 56b in the conventional tip 53, the effective blade width is widened and the durability is improved. In addition, the cutting edge angle τ becomes sharp and the sharpness is improved. Roughness is improved.

  The hard chip 15 has a rake face 17 on the front surface in the rotation direction, and the rake angle β is set to 5 to 7 degrees. The first cutting edge 16a constituting the cutting edge 16 and the two second cutting edges 16b, 16b are both set to a negative rake angle α, and the negative rake angle α is set to 10 to 20 degrees. It is set and has a strong shape against impact. Note that the clearance angle γ and the front clearance angle δ of the side clearance 18 provided on both side surfaces of the hard chip 15 are about 1 degree and the front clearance angle δ is 8 to 10 degrees, similar to the conventional one. Respectively.

  As described above, the cutting edge structure of the hard tip 15 according to this embodiment includes the first cutting edge 16a in which the cutting edge 16 corresponding to the outer edge of the tip saw 10 is formed in the central portion, and the angle provided on both sides thereof. Since the second cutting blades 16b and 16b are chamfered at λ, the cutting time is shortened when the material tube is cut by the tip saw 10, and the working efficiency is improved. Further, the blade width of the blade edge 16 is substantially increased, and durability and straightness are improved. Furthermore, the quality of the product obtained by cutting the material tube 55 is improved.

It is a front view of the chip saw which is the implementation of the present invention. It is II-II sectional drawing in FIG. It is a front view of a left-handed hard chip. It is a front view which shows the right-handed hard chip. 3 is an external view showing a main part of the cutting machine 50. FIG. It is a front view equivalent to FIG. 3 which shows the conventional hard chip | tip.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Tip saw 11 Shaft hole 12 Disc 13 Mounting hole 15 Hard tip 15a Left hand 15b Right hand 16 Cutting edge 16a First cutting blade 16b Second cutting blade 16c Relief groove 17 Rake face 18 Side relief 50 Cutting machine 51 Support base 52 Clamp means 53 Tip saw 54 Support arm 55 Material tube 53a Cutting edge 53b Chamfer α Rake angle β Rake angle γ Relief angle λ Chamfer angle τ Cutting edge angle

Claims (3)

  In a milling-type tip saw in which a large number of hard tips are attached to the periphery of a disc having a shaft hole, and a blade tip formed parallel to the axis of the shaft hole is provided on the hard tip, the blade tip is left in the center in the width direction. A cutting blade structure comprising a first cutting blade and a second cutting blade chamfered at a shallow chamfering angle that decreases in height from both ends of the first cutting blade toward the outside in the width direction.   The cutting blade structure according to claim 1, wherein the first cutting blade and the two second cutting blades have substantially the same width.   The cutting edge structure according to claim 1, wherein the shallow chamfer angle is set in a range of 8 degrees to 16 degrees.

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