JP6349090B2 - Saw blade - Google Patents

Description

  The present invention is a saw blade such as a circular saw blade or a band saw blade that cuts a metal material as a workpiece, and the tip of the saw tooth has a suitable shape such as cemented carbide, cermet, ceramic, high-speed tool steel, etc. The present invention relates to a saw blade provided with a hard tip, and more particularly, to a saw blade provided with a pair of succeeding teeth that respectively finish the cut surfaces facing each other in a workpiece.

  Conventionally, a band saw machine has been used as a cutting device for cutting, for example, a metal material as a workpiece. When cutting a workpiece with a band saw machine, in order to achieve more efficient cutting, such as cutting to obtain a highly accurate cutting surface, for example, high-speed cutting of an aluminum block (saw speed of 1000 m / min) or more, It is important to improve the accuracy of the cut surface by suppressing the vibration of the band saw blade. Suppressing the vibration of the band saw blade not only improves the accuracy of the cut surface but also reduces noise, prevents cutting troubles such as chipping during cutting, and improves the life of the saw blade.

  The saw blade is provided with set teeth that swing out in the left-right direction (left-right direction when viewed from the above-mentioned cutting direction) with respect to the workpiece cutting direction (traveling direction for the band saw blade and rotational direction for the circular saw). In this type of saw blade, in order to avoid resonance of each saw tooth, a structure is adopted in which the pitch between the saw teeth is unequal. Further, in order to suppress the vibration of the saw blade during cutting, there is a batachisari saw blade provided with a repellent (pigtail-shaped) saw blade having a wide tip (trapezoidal shape), that is, a batachisari type saw blade.

  The above-mentioned batiksari saw blade is generally provided with a hard tip such as cemented carbide at the tip of each saw tooth. The hard tip is generally formed in a symmetrical shape when viewed from the workpiece cutting direction. The shape of the hard tip is a trapezoid whose tip side is wide in the left-right direction or a trapezoid whose tip side is narrow. There are various shapes formed. In the above-mentioned blade saw blade, the bevel-shaped saw blade that finishes the cut surface of the workpiece has a small tooth height dimension (dimension from the reference position to the tooth tip (tip portion)), and the tip side is the largest in the left-right direction. Thus, the finished surface of the cut surface is finished by the left and right end portions of the tip edge of the bee-shaped saw blade.

  That is, when finishing the cutting surface of the workpiece with the bee-shaped saw blade, the left and right end portions of the tip edge of the bee-shaped saw blade are always facing each other in the cutting groove processed by the preceding tooth provided on the saw blade. The surface is being finished. That is, the left and right ends are always constrained in the left-right direction by the opposed cut surfaces. Therefore, if there is a slight variation in the tooth profile accuracy due to manufacturing errors of the bevel-shaped saw blades, the load (cutting resistance) on both the left and right sides during workpiece cutting will fluctuate, and cutting and chipping will easily occur. is there.

  There are various types of saw blades provided with a bee-shaped saw blade. Among them, Patent Documents 1 and 2 are prior examples of saw blades that are considered to be related to the present invention.

JP 2000-263327 A Japanese Patent No. 4727919

  Patent Document 1 includes a trapezoidal leading tooth (indicated by reference numeral 21 in FIG. 6 of Patent Document 1) having a large tooth height and a narrow tip end side, and is cut by the preceding tooth. A saw blade having left and right spur teeth (denoted by reference numerals 19 and 23) for expanding the cut grooves is described. Since the left and right spur teeth function to widen the cutting groove, a large cutting resistance acts, and a large lateral force due to the cutting resistance acts. Therefore, as shown in FIG. 9 of Patent Document 1, the surface roughness (Rmax) of the cut surface is as large as 30 μm. Improvement is desired.

  7 to 12 of Patent Document 2 also describe the same configuration as that described in Patent Document 1. The configuration described in Patent Document 2 is the same as that of Patent Document 1 because the preceding teeth, the preceding teeth corresponding to the horizontal teeth in the horizontal direction, and the horizontal teeth in the horizontal direction are configured to have the same height. It has the problem of.

The present invention was made in view of the problems as described above, and is a saw blade provided with a hard tip at the tip of a plurality of saw teeth formed at appropriate intervals in a base material,
The plurality of saw teeth are
A first succeeding tooth including a first tip having a tip side that is wide trapezoidal in the thickness direction of the base material and has chamfered portions at both ends of a linear tip edge;
The first tip is provided with a second tip in which a tip blade portion protruding from the tip edge is formed in a trapezoidal shape with a narrow tip side, and the tooth height dimension is larger than the tooth height dimension of the first subsequent tooth. Anterior teeth,
A second succeeding tooth comprising a third tip having the same tooth height as the first succeeding tooth and having a protruding blade portion projecting in the width direction from one chamfered portion of the first tip;
A third succeeding tooth comprising a fourth tip having a tooth height dimension identical to that of the first succeeding tooth and having a protruding blade portion projecting in the width direction from the other chamfered portion of the first tip;
In order to suppress the vibration caused by the component force in the left-right direction, the cutting amount W3 with respect to the cutting surface of the workpiece facing the second and third subsequent teeth is 4% of the total width W4 of the cutting groove. It is the structure which performs each opening, It is characterized by the above-mentioned.

  Further, in the saw blade, a tooth height dimension between a tooth height dimension of the preceding tooth and a tooth height dimension of the first succeeding tooth, and a second preceding tooth that widens a cutting groove by the preceding tooth. It is characterized by having.

  In the saw blade, a plurality of the first subsequent teeth are provided in one sawtooth pattern.

  In the saw blade, the total number of the second and third subsequent teeth in one sawtooth pattern is equal to or less than the sum of the number of the first subsequent teeth and the number of the preceding teeth. It is characterized by this.

  In the saw blade, the protruding amount of the protruding blade portion in the second and third subsequent teeth is in the range of 0.20 mm to 0.05 mm.

  In the saw blade, the second and third succeeding teeth are provided on the rear side of the one sawtooth pattern.

  According to the present invention, the second and third succeeding teeth have the same height as the first succeeding tooth and are chamfered portions formed at both ends of the straight leading edge of the first succeeding tooth. Projecting blade portions projecting in the opposite direction from each other contribute to the cutting of the workpiece. Since the chamfered portion is a small chamfer and the protruding amount of the protruding blade portion is small, the cutting resistance acting on the second and third succeeding teeth is small, and the workpiece is cut by a saw blade. The component force in the left-right direction is suppressed to be small. Accordingly, the opposed cut surfaces of the workpiece are processed with high accuracy by the second and third subsequent teeth.

It is explanatory drawing of the saw blade which shows that the fundamental structure in the several saw blade in the saw blade which concerns on embodiment of this invention is comprised from a leading tooth, a 1st, 2nd, 3rd succeeding tooth. The saw blade shown in FIG. 1 is an explanatory diagram showing the relationship and shape of the overlapping of the saw teeth and the tooth height dimension of each saw blade when viewed in the direction opposite to the arrow X direction shown in FIG. It is. It is explanatory drawing of the saw blade which concerns on 2nd Embodiment of this invention. It is explanatory drawing which represented the saw blade which concerns on 2nd Embodiment according to FIG. It is explanatory drawing of the saw blade which concerns on 3rd Embodiment. It is explanatory drawing which represented the saw blade concerning 3rd Embodiment according to FIG. It is explanatory drawing of a saw blade at the time of providing a some preceding tooth. It is explanatory drawing of the pitch pattern of a saw blade, and a set pattern. It is explanatory drawing of the pitch pattern of a saw blade, and a set pattern. It is explanatory drawing of the saw blade used for the experiment of the cutting process of a workpiece | work. It is explanatory drawing which shows an experimental result.

  Hereinafter, a saw blade according to an embodiment of the present invention will be described with reference to the drawings. The present invention can be applied to both a circular saw blade and a band saw blade. And

  Referring to FIG. 1, a saw blade 1A according to the first embodiment of the present invention has a base material 3 (in the case of a band saw blade, a band shape, and in the case of a circular saw blade, a disk shape) 3 The base material 3 is provided with a plurality of saw teeth 5, 7, 9, and 11 at appropriate intervals and in an appropriate arrangement in the same manner as a general saw blade. A galette 13 is provided between each of the saw teeth 5, 7, 9, 11. Further, hard tips 15, 17, 19, and 21 made of an appropriate material such as cemented carbide are integrally fixed to the tips of the saw teeth 5, 7, 9, and 11, for example.

  The saw blade 5 is a leading tooth (hereinafter referred to as the leading tooth 5) that first cuts the workpiece (not shown) when cutting the workpiece (not shown). The tooth height dimension of the hard tip 15 up to the linear tip blade portion 15A (see FIG. 2) is the largest saw blade. The hard tip 15 has a workpiece cutting direction X (corresponding to the traveling direction for the band saw blade and the rotating direction for the circular saw blade) perpendicular to the cutting direction (the arrow Z direction in FIG. 1A) with respect to the workpiece. When viewed from the above, it is formed by grinding a trapezoidal hard tip whose tip side (the tip blade portion 15A side) is wide.

  That is, the tip of the hard tip 15 is the thickness direction of the base material 3 (the left-right direction in FIG. 2, the left-right direction as viewed from the direction opposite to the arrow X in FIG. By grinding a trapezoidal hard tip that is wide in this horizontal direction), as shown in FIG. 2 (B), inclined surfaces 15B whose tip sides approach each other on both sides in the width direction. Are formed symmetrically. In other words, the distal end side of the hard chip 15 is formed in a trapezoidal shape with a narrower distal end side.

  The saw blade 7 has a function of expanding a cutting groove (cutting groove) having a width W1 (see FIG. 2A) formed on the workpiece by the preceding teeth 5 into a cutting groove having a width W2. The succeeding tooth is configured to have a tooth height dimension smaller than the tooth height dimension of the preceding tooth 5. The initial shape of the hard tip 17 provided in the first subsequent tooth 7 is the same as the initial shape of the hard tip 15 in the preceding tooth 5. A linear tip edge (cutting blade portion) 17A is formed by grinding to make the tooth height dimension smaller than that of the preceding tooth 5, and chamfered portions 17B are formed at both ends of the tip edge. It is. The chamfered portion 17B is formed on an inclined surface parallel to the inclined surface 15B of the preceding tooth 5. When the sizes of the inclined surface 15B and the chamfered portion 17B are compared, the chamfered portion 17B is extremely small.

  The sawtooth 9 is a second succeeding tooth, and has a function of slightly expanding one side of the cutting groove widened to the width W2 by the first succeeding tooth 7 by W3. The saw tooth 11 is a third succeeding tooth, and has a function of slightly expanding the other side of the cutting groove widened to the width W2 by the first succeeding tooth 7 by W3.

  The tooth height dimension of the second and third succeeding teeth 9 and 11 is made equal to the tooth height dimension of the first succeeding tooth 7. That is, there are four types of saw teeth and two types of tooth height dimensions. The initial shapes of the hard tips 19 and 21 in the second and third succeeding teeth 9 and 11 are the same as the initial shapes of the hard tips 15 and 17 in the preceding tooth 5 and the first succeeding tooth 7. By performing the grinding process, it is formed into a shape as shown in FIGS. 2 (C) and 2 (D). As shown in FIGS. 2C and 2D, the hard tips 19 and 21 in the second and third succeeding teeth 9 and 11 are formed symmetrically with each other.

  That is, one end portion of the tip edge 19A of the hard tip 19 in the second subsequent tooth 9 is subjected to finish processing of one of the cut surfaces facing the workpiece, so that one of the hard tips 17 in the first subsequent tooth 7 is processed. An acute-angled protruding blade portion 19B that slightly protrudes in the width direction from the chamfered portion 17B is formed. A flank 19C is formed at the other end of the tip edge 19 to hold the non-contact state on the other cut surface of the workpiece when the workpiece is cut. Since the hard tip 21 of the third subsequent tooth 11 is symmetrical with the hard tip 19, parts corresponding to the functions of the respective parts of the hard tip 19 are denoted by reference numerals corresponding to those of the hard tip 19. A duplicate description will be omitted.

  By the way, the initial shape of the hard tips 19 and 21 in the second and third succeeding teeth 9 and 11 is the initial shape of the hard tip 17 in the first succeeding teeth 7 (the chamfered portion 17B is formed). It is the same as the previous shape. Therefore, the protruding amount in the left-right direction of the protruding blade portions 19B, 21B corresponds to the protruding amount in the left-right direction (width direction) before the chamfered portion 17B is formed on the hard tip 17 in the first subsequent tooth 7. The amount of protrusion.

  When the saw blade 1A (band saw blade) is mounted on the band saw machine as described above to cut a metal workpiece, the saw blade 1A is driven to move in the direction of arrow X shown in FIG. Will cut in the direction. As described above, when the saw blade 1A is cut into the workpiece, the leading tooth 5 having the largest tooth height dimension cuts into the workpiece first.

  When the leading tooth 5 cuts the workpiece, the shape of the hard tip 15 in the leading tooth 5 is symmetrically inclined with respect to the cutting direction of the saw blade 1A (the direction perpendicular to the paper surface in FIG. 2). Therefore, the leading teeth 5 are cut well with respect to the workpiece. When the tip edge portion 15A of the hard tip 15 cuts into the workpiece, the saw blade 1A functions as a guide in the cutting direction, and vibrates in a direction perpendicular to the cutting direction (left and right in FIG. 2). It is to suppress. That is, cutting with good straightness is performed without causing cutting.

  As described above, when the leading tooth 5 cuts into the workpiece to form a cutting groove having the width W1 shown in FIG. 2A, the first succeeding tooth 7 cuts into the workpiece, and the cutting groove is formed as W2. Expand to width. Then, the protruding blade portions 19B and 21B in the second and third subsequent teeth 19 and 21 protrude in the width direction from the slight chamfered portion 17B in the first subsequent teeth 7, and the cut surfaces facing the cutting grooves are cut into the cut surfaces. Cutting is performed with a cut amount W3 with respect to the surface, and the width of the cut groove of the workpiece is expanded to W4.

  As described above, when the width of the cutting groove is expanded from W2 to W4, the cutting amount W3 with respect to the cutting surface of the workpiece facing the second and third subsequent teeth 9 and 11 is set to the width W4 of the cutting groove. The amount is very small, and the ratio of 2W3 / W4 is set to about 0.08. Therefore, the second and third succeeding teeth 9 and 11 only expand about 4% (about 8% on both sides) of the cutting groove width W4. For example, in the case of W4 = 2.4 mm, W3 = 0.1 mm, and the cut amount with respect to the opposed cut surfaces is small. Therefore, the cutting resistance acting on the second and third subsequent teeth 9 and 11 when cutting the workpiece is extremely small compared to the cutting resistance of the leading teeth 5 and the first trailing teeth 7, and The component force in the direction perpendicular to the cut surface (component force in the left-right direction) is also small, and vibrations caused by the component force in the left-right direction can be suppressed.

  Therefore, when the workpiece is cut by the saw blade 1A, the cutting surfaces facing each other with the workpiece cutting groove in between can be cut with high accuracy.

  The cutting amount W3 by the second and third succeeding teeth 9, 11 is not limited to the above, and can be set to 0.1 mm or less. That is, as the cutting amount W3 is reduced, the component force in the left-right direction is reduced, and the cut surface can be processed with higher accuracy. In consideration of wear and the like, 0.03 mm or more is desirable.

  By the way, as understood from the above configuration, the function of further cutting and expanding to the width of W2 with respect to the cutting groove having the width W1 cut by the leading tooth 5 is due to the first trailing tooth 7. . Since the second and third succeeding teeth 9 and 11 have the same tooth height dimension as the first succeeding tooth 7, the incision to the workpiece is a part of the width W3 and is extremely small. . In other words, the amount of work in the cutting direction for the workpiece by the second and third succeeding teeth 9 and 11 is extremely small.

  The projecting blade portions 19B and 21B in the second and third succeeding teeth 9 and 11 only act on one of the cut surfaces, respectively, and on the opposite side of the projecting blade portions 19B and 21B are flank surfaces, respectively. Since 19C and 21C are formed, they can be elastically deformed to the opposite side when subjected to a strong impact or cutting resistance from the lateral direction. Therefore, tooth missing at the time of cutting the workpiece can be prevented, and the accuracy of the cut surface can be improved. That is, since the second and third succeeding teeth 9 and 11 individually finish facing cutting surfaces, the second and third succeeding teeth 9 and 11 respectively cut the workpieces facing each other. There is no pinching between the surfaces.

  Therefore, even when left-right vibration occurs in one of the subsequent teeth 9, the one subsequent tooth 9 can be elastically deformed in the left-right direction to absorb the vibration in the left-right direction. That is, even if the second and third succeeding teeth 9 and 11 are subjected to vibration in the left-right direction, the influence of the vibration is not imparted to the other succeeding teeth. The cutting accuracy of the cut surface can be improved.

  By the way, also in the saw blade of the structure described in each said patent document, since each subsequent saw-tooth which processes the cut surface which the workpiece | work opposes acts separately with respect to the cut surface of a workpiece | work, with respect to a cut surface It can be elastically deformed by the component force in the orthogonal direction (component force in the left-right direction). However, each of the saw teeth functions to further widen the cutting groove machined by the preceding tooth (the sum of the cutting widths of each succeeding tooth is substantially equal to the cutting width of the preceding tooth), and each succeeding tooth A large cutting resistance acts on the sawtooth. Therefore, the component force in the left-right direction also increases, and vibration tends to occur in the left-right direction, and it is difficult to machine the cut surface of the workpiece with high accuracy with a surface roughness (Rmax) of 30 μm or less.

  As already understood, in order to cut the cutting surfaces opposed to each other with higher accuracy, the saw blade has good linear travelability and the horizontal direction acting on the saw blade that cuts the cutting surface. It is necessary to suppress the vibration in the left-right direction by reducing the force. In response to this demand, the leading tooth 5 in the saw tooth 1A first cuts the workpiece, and has a leading edge 15A projecting from the leading edge 17A of the hard tip 17 in the first trailing tooth 7 and left and right. Since it is the structure provided with the symmetrical inclined surface 15B on both sides, the linear cutting property of a saw blade is favorable, and the vibration to the left-right direction can be suppressed effectively.

  The first succeeding teeth 17 in the saw blade 1A serve to widen the cutting grooves cut by the preceding teeth 5, and the second and third succeeding teeth 19, 21 are cut. Since it has a configuration that suppresses the function of expanding the groove and suppresses the generation of component forces in the left-right direction in order to improve the finishing processing function of the cutting surface, it can process the cutting surface of the workpiece with high precision It is. In other words, the second and third subsequent teeth 9 and 11 are saw blades dedicated to finishing processing of the cut surface of the workpiece (saw blades that place importance on the function of improving the accuracy of the cut surface rather than the function of expanding the cut surface) The cutting surface of the workpiece can be cut with higher accuracy.

  3 and 4 show a saw blade 1B according to the second embodiment of the present invention. In the saw blade 1B according to the second embodiment, components having the same functions as those of the saw blade 1A are denoted by the same reference numerals, and redundant description is omitted.

  The saw blade 1B according to the second embodiment has a configuration in which a second leading tooth 23 is provided between the first trailing tooth 7 and the second trailing tooth 9 with respect to the construction of the saw blade 1A. is there. The tooth height dimension of the second preceding tooth 23 is set smaller than the tooth height dimension of the preceding tooth 5 and larger than the tooth height dimension of the first succeeding tooth 7. The hard tip 25 provided in the second leading tooth 23 is provided with a leading edge portion 25A that is wider in the left-right direction than the leading edge portion 15A of the hard tip 15 in the leading tooth 5. The left and right end sides of the tip blade portion 25A protrude in the left-right direction from the inclined surface 15B of the hard tip 15, and inclined surfaces 25B parallel to the inclined surface 15B are formed on the left and right end sides.

  That is, in the saw blade 1B according to the second embodiment, it is configured in a set pattern of five saw teeth (5, 7, 9, 11, 23), and the tooth height dimension is configured in three types. . In this saw blade 1B, the number of left and right symmetrical hard chips (15, 17, 25) is three, which is larger than that of the saw blade 1A (two). In addition to being more effectively suppressed, the straightness of the saw blade 1B is further improved. Further, since the number of saw teeth is large, the cutting of the workpiece is shared by each saw tooth, and the cutting resistance of each saw tooth is reduced, and vibration is suppressed.

  Therefore, the saw blade 1B can improve the accuracy of the cutting surface of the workpiece as compared with the saw blade 1A, and can improve the saw blade life by suppressing the cutting resistance of each saw tooth. Highly efficient cutting can be performed.

  5 and 6 show the configuration of the saw blade 1C according to the third embodiment, and components having the same functions as the configurations of the saw blades 1A and 1B of the above-described embodiment are denoted by the same reference numerals. Thus, duplicate explanations are omitted.

  The saw blade 1 </ b> C according to the third embodiment includes a third leading tooth 27 having a tooth height dimension intermediate between the tooth height dimension of the second leading tooth 23 and the tooth height dimension of the first trailing tooth 7. In addition, two first succeeding teeth 7 are provided. The hard tip 29 of the third leading tooth 27 includes a leading edge portion 29A that is wider in the left-right direction than the leading edge portion 25A of the hard tip 25 of the second leading tooth 23. The left and right end sides of the tip blade portion 29A protrude in the left-right direction from the inclined surface 25B of the hard tip 25, and inclined surfaces 29B parallel to the inclined surface 25B are formed on the left and right end sides. is there.

  As is clear from the above configuration, the saw blade 1C according to the third embodiment is a clam pattern having seven saw teeth (5, 7, 23, 7, 27, 9, 11) sequentially, The high dimensions are four types of tooth height dimensions. The third leading tooth 27 serves to further widen the cutting groove widened by the second leading tooth 23. That is, in the saw blade 1C, the width dimension in the left-right direction of the tip blade portion increases as the tooth height dimension decreases, and the cutting resistance is distributed to each saw tooth (5, 23, 27, 7). The cutting resistance of each saw tooth is suppressed to be smaller, and the occurrence of vibration due to the cutting resistance can be suppressed.

  In the configuration of the saw blade 1C, the number of left and right symmetrical hard chips is increased, and vibrations in the left and right directions are more effectively suppressed and straightness is further improved. In the saw blade 1C, the plurality of first subsequent teeth 7 are provided, so that the cutting amount of the second and third subsequent teeth 9 and 11 in the cutting direction with respect to the workpiece is further reduced and the cutting resistance is further reduced. can do. Therefore, the cutting resistance in the cutting direction can be further reduced, the vibration caused by the cutting resistance can be further reduced, and the processing accuracy of the workpiece cutting surface can be made a highly accurate cutting surface.

  That is, in the saw blade 1C, the cutting amounts of the tip edges 19A and 21A of the hard tips 19 and 21 in the second and third succeeding teeth 9 and 11 with respect to the workpiece are substantially zero, and the cutting with respect to the workpiece is the protruding blade portion. Only 19B and 21B are used, and the form is used exclusively for finishing the cut surface of the workpiece. Therefore, the cutting accuracy of the cut surface is further improved.

  As already understood, a saw blade is provided with a leading edge provided at the tip of a hard tip and four or more leading teeth provided with inclined surfaces on both the left and right sides as shown in FIG. The cutting resistance acting on the sawtooth is distributed to each sawtooth, so that the cutting resistance of each sawtooth can be made smaller and the straightness can be improved. In addition, the number of preceding teeth can be made into a desired number.

  Further, the saw blade 1B shown in FIG. 3 is a clam pattern constituted by five teeth of saw teeth 5, 7, 23, 9, 11 having different shapes. As shown in FIG. 8, the pitch pattern is three pitch patterns PP (3) in which the pitches P1, P2, and P3 are repeated. That is, in this case, the pitch pattern and the set pattern are 3 × 5 = 15 patterns. As described above, a complex tooth profile pattern can be realized by combining the number of pitch patterns and the number of set patterns as different numbers.

  FIG. 9 shows the saw blade 1C shown in FIG. 5 as six pitch patterns PP (6) in which the pitches P1 to P6 are repeated, and seven saw teeth (5, 7, 23, 7, 27, 9, In the clam pattern consisting of 13), 6 × 7 = 42 patterns.

  Incidentally, in order to investigate the relationship between the configuration of the saw blade and the surface roughness of the cut surface of the workpiece, the saw blade NO. 1-NO. 4 was made and a cutting experiment was conducted. NO. Shown in FIG. The first saw blade is configured to include a first leading tooth 5, a second leading tooth 23, and a repellent saw blade 31 whose left and right end sides simultaneously act on the cutting surface of the workpiece. And the protrusion amount of the protruding blade part which the repellent saw blade 31 protrudes from the 2nd preceding tooth | gear 23 in the left-right direction and cuts a workpiece | work is 0.28 mm (structure which expands about 23% of the cutting groove full width). .

  NO. Shown in FIG. 10 (B) to FIG. 10 (D). 2-NO. 4 has the same five-tooth configuration as the saw blade shown in FIG. The tooth height of the saw blades 5, 23 and 31 in one saw blade is the same. And NO. The protruding amount in the left-right direction of the protruding blade portions 19B and 21B at the saw blades 19 and 21 from the saw blade 17 of the second saw blade is 0.20 mm (a configuration that expands about 17% of the entire width of the cutting groove). In the same configuration, NO. No. 3 saw blades 19B and 21B have a protruding amount in the left-right direction of about 8%, NO. The amount of protrusion at the 4 saw blade is about 4%.

  In addition, W shown to FIG. 10 (A) is a work amount of the cutting direction of each tooth. The area of the rectangle formed by the work amount in the cutting direction is the work amount of the protruding blade portion, and the smaller the area, the smaller the work amount.

  The NO. 1-NO. Samples 1, 2 and 3 were manufactured by manufacturing three saw blades of 4 with the same material and the same tooth profile. Then, an aluminum square (1.68 m × 1.68 m) is used as a work material, a saw speed of 2000 m / min, a cutting speed of 300 mm / min, a band saw blade width of 80 mm, a thickness of 1.6 mm, and 0.5 / 0.8 P. The surface roughness Ra (μm) was measured when the cutting area was 1,000,000 cm 2 (measuring method: JISB0601-2001 and ISO standard). The results are as shown in FIG. there were.

  As is clear from FIG. The surface roughness Ra of the saw blade of No. 1 is about 12 μm on average, while NO. In the case of 2 saw blades, the average is about 4.7 μm. And NO. No. 3 saw blade has an average of about 3.0 μm and NO. In the case of 4 saw blades, the average is about 2.7 μm.

  In addition, according to the application example of the surface roughness according to JIS B0601: 1990, the Rmax roughness classification 6.3S is defined as “good machine finish surface”, and this Rmax is determined according to “20. Various surfaces according to JIS B0601: 2013”. Rmax 6.3S corresponds to the triangle symbol “▽▽▽” and is higher than the arithmetic average roughness (Ra) of 3.2 because it is the value of the maximum height (Rz) in the “Roughness Value Correspondence Table”. It means accuracy. In other words, NO. 3 and NO. 4 indicates that “good machine finish surface” is achieved.

  Therefore, even if the configuration of each saw blade is similar when viewed from the cutting direction (traveling direction) of the saw blade, the amount of protrusion of the protruding blade portions 19B and 21B in the left and right directions at the second and third subsequent teeth is determined. It can be seen that reducing the size is effective for cutting the cut surface of the workpiece with higher accuracy. In addition, the cutting surface in which one end side of both the left and right ends of the saw blade for finishing is opposed to the configuration in which the left and right ends of the saw blade for finishing work simultaneously work on the facing cutting surface (NO.1 saw blade). The configuration (NO.2 to NO.4 saw blade) that acts only on one of these can cut the cut surface with higher accuracy.

  As will be understood from the above description, in order to cut the workpiece cutting surface with higher accuracy with a saw blade having a hard tip at the tooth tip, NO. 3-NO. As shown in FIG. 4, the function of expanding the cutting groove by cutting the leading teeth with the subsequent teeth is suppressed to a small extent to expand about 8% or less of the entire width of the cutting groove, thereby causing the horizontal direction caused by the cutting resistance. The vibration of the saw blade can be suppressed, and the cut surface of the workpiece can be cut with higher accuracy.

  By the way, as already understood, the protruding blade portions 19B and 21B of the hard tips 19 and 21 on the second and third subsequent teeth 9 and 11 from the left and right chamfered portions 17B of the hard tip 17 on the first subsequent teeth 7 are changed. By adopting a configuration that protrudes in the left-right direction, the opposed cut surfaces of the workpiece can be finished with high accuracy. At this time, the first succeeding tooth 7 has a chamfered portion 17B on both the left and right sides and is excellent in straightness, and the cutting of the cut surface by the first succeeding tooth 7 is also performed relatively well. Is.

  That is, since the cut surface cut relatively well by the first subsequent teeth 7 is finished by the protruding blade portions 19B and 21B in the second and third subsequent teeth 9, 11, the cut surface This improves the cutting accuracy.

  Here, it is also conceivable to apply the configuration as described above to a clawing saw blade that has been sawtoothed out (clawed out). That is, a chamfered portion corresponding to the chamfered portion 17B of the hard tip 17 in the first subsequent tooth 7 is formed on the left and right subsequent set teeth (chamfered set teeth) in the set-up saw blade. And it is set as the structure which protruded in the left-right direction from the chamfering part in the said chamfering set teeth in the left and right subsequent finishing set teeth which perform the finishing process of the cut surface of a workpiece | work.

  In the set-up saw blade having the above-described configuration, the cutting grooves (cutting grooves) cut by the leading teeth are expanded by the left and right chamfered set teeth. Then, the cutting surfaces facing the left and right sides of the expanded cutting groove are finished with the left and right subsequent finishing set teeth.

  As already understood, when the left and right chamfered set teeth expand the cutting groove, a large cutting resistance acts on the chamfered set teeth and a component force in the left and right direction acts. Therefore, the cut surface of the workpiece cut by the left and right chamfering set teeth is subject to the adverse effects of vibration caused by the left and right component forces acting on the left and right chamfering set teeth, and is easily cut into an uneven surface. is there.

  As described above, when vibration occurs in the left and right chamfering set teeth having the chamfered portion, the amount of protrusion of the edge portion in the left and right subsequent finishing set teeth from the chamfered portion in the chamfered set teeth changes in the left-right direction. become. As described above, when the amount of protrusion of the edge portion in the left and right subsequent finish set teeth changes in the left and right direction, the cutting resistance acting on the edge portion changes, and the left and right subsequent finish set teeth are changed in the left and right direction. The component force changes.

  Therefore, the left and right subsequent finishing set teeth tend to vibrate in the left and right directions due to changes in the component force acting in the left and right directions, and it becomes difficult to machine the cut surface of the workpiece with higher accuracy. Is. Therefore, it is difficult to apply the configuration of the sawtooth blade of the battering tooth as described above to the clawing saw blade that swings the saw tooth in the left-right direction.

  In other words, the set-up saw blade is configured to easily generate vibrations in the left-right direction, and the sawtooth blades of batiksari teeth are configured to suppress the vibrations in the left-right direction and improve straightness, so the configuration is basically Is different. Therefore, it is difficult to apply the configuration of the sawtooth blade of the battered tooth to the clawing saw blade, and conversely, to apply the configuration of the claw sawtooth blade to the sawtooth of the battered tooth.

1A, 1B, 1C Saw blade 3 Base material 5 Saw blade (preceding tooth)
7 sawtooth (first follower tooth)
9 sawtooth (second follower tooth)
11 Sawtooth (third follower tooth)
15 Hard Tip 15A Tip Blade 15B Inclined Surface 17 Hard Tip 17A Tip Edge (Cutting Blade)
17B Chamfered portion 19 Hard tip 19A Tip edge 19B Protruding blade portion 19C Flank 21 Hard tip 21A Tip edge 21B Protruding blade portion 21C Flank 23 Second leading tooth 25 Hard tip 25A Tip blade portion 25B Inclined surface 27 Third leading edge Teeth 29 Hard chip W Work in cutting direction

Claims (6)

A saw blade with a hard tip at the tip of a plurality of saw teeth formed at appropriate intervals in the base material,
The plurality of saw teeth are
A first succeeding tooth including a first tip having a tip side that is wide trapezoidal in the thickness direction of the base material and has chamfered portions at both ends of a linear tip edge;
The first tip is provided with a second tip in which a tip blade portion protruding from the tip edge is formed in a trapezoidal shape with a narrow tip side, and the tooth height dimension is larger than the tooth height dimension of the first subsequent tooth. Anterior teeth,
A second succeeding tooth comprising a third tip having the same tooth height as the first succeeding tooth and having a protruding blade portion projecting in the width direction from one chamfered portion of the first tip;
A third succeeding tooth comprising a fourth tip having a tooth height dimension identical to that of the first succeeding tooth and having a protruding blade portion projecting in the width direction from the other chamfered portion of the first tip;
In order to suppress the vibration caused by the component force in the left-right direction, the cutting amount W3 with respect to the cutting surface of the workpiece facing the second and third subsequent teeth is 4% of the total width W4 of the cutting groove. A saw blade characterized by being configured to perform each opening.   2. The saw blade according to claim 1, wherein the tooth height dimension is between the tooth height dimension of the preceding tooth and the tooth height dimension of the first succeeding tooth, and the cutting groove formed by the preceding tooth is widened. A saw blade having a leading tooth.   The saw blade according to claim 1 or 2, wherein a plurality of the first following teeth are provided in one saw tooth pattern.   The saw blade according to claim 2 or 3, wherein the total number of the second and third subsequent teeth in one sawtooth pattern is equal to the sum of the number of the first subsequent teeth and the number of the preceding teeth. Or a saw blade characterized by being less than the said sum.   The saw blade according to any one of claims 1 to 4, wherein a protruding amount of the protruding blade portion in the second and third subsequent teeth is in a range of 0.20 mm to 0.05 mm. blade.   The saw blade according to any one of claims 1 to 5, wherein the second and third subsequent teeth are provided on the rear side of the one saw tooth pattern.

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