JP2009045734A - Band saw blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a band saw blade capable of preventing an intrusion of chips into a gap between a side face of the band saw blade and a cutting face of a workpiece. <P>SOLUTION: There is provided a band saw blade 1 with a trunk 14 and a blade 15 welded and bonded to each other, including a straight tooth 3S and right/left set teeth 5L, 7R, 9L, 11R formed so as to be set in right/left direction, wherein protrusions BL and BR protruded from the side face of the trunk 14 are formed on a weld-bonded part 12 of the trunk 14 and the blade 15, with a protrusion height dimension of the protrusion from the side face of the trunk 14 set to be smaller than a protrusion height dimension of the trunk 14 from the side face to an edge point of the set teeth 5L and 5R set in the right/left directions, and the protrusion height dimension of the protrusion set to be a height dimension capable of preventing an intrusion of chips into a gap between the side face of the trunk in the band saw blade and the cutting face of a workpiece when the workpiece is cut by the band saw blade 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a band saw blade. More specifically, the present invention has a function of preventing chips generated when a workpiece is cut by the band saw blade from entering a gap between the band saw blade and the cutting surface of the workpiece. It relates to a band saw blade.

  As a typical band saw blade conventionally known, for example, there is a band saw blade 101 as shown in FIG. The band saw blade 101 has a plurality of groups of patterns configured by including an appropriate number of straight teeth 103S and right and left set teeth 105R and left set teeth 107L that are swung to the left and right.

  In the band saw blade 101, in general, there is no portion protruding from the side surface of the body portion 109 of the band saw blade 101, that is, in the thickness direction of the band saw blade 101, other than the left and right set teeth 105R and 107L.

  In the band saw blade 101 described above, the body material forming the body portion 109 and the blade material forming the tooth portion 113 are different, for example, spring steel having a high elastic limit is used for the body material, and the blade material has high hardness. There is also a bimetal band saw blade using high-speed steel (for example, Patent Document 1).

  As shown in FIG. 9A, the joint portion (welding bead) 111 between the body portion 109 and the tooth portion 113 in the bimetal band saw blade protrudes on both side surfaces of the body portion 109 and protrudes. May occur. In this case, in the subsequent process, the joint (weld bead) 111 is flattened by rolling or polishing.

  For example, when the convex portion of the joint (weld bead) 111 is polished, the cross-sectional area of the joint (weld bead) 111 decreases as shown in FIG. When the joint (weld bead) 111 is rolled, the cross-sectional area of the weld joint (weld bead) 111 decreases. In addition, when the joint (weld bead) 111 is rolled, the cross-sectional area of the joint (weld bead) 111 decreases, and at the same time, the minute recesses 115 as shown in FIG. May occur.

  In the case of a band saw blade in which the body material forming the body portion 109 and the blade material forming the tooth portion 113 are different from each other, when the body material and part of the blade material are melted and welded together, the materials are brought into close contact with each other. Since the pressure is applied in the direction in which it is applied, the joint (welding bead) is raised as shown in FIG. Therefore, a post-process such as rolling or polishing for flattening the raised portion is necessary.

  The reason why a post-process such as rolling or polishing is necessary is that when the materials before gear cutting are overlapped and processed for mass production in the gear cutting process such as milling in the manufacturing process of the band saw blade. This is because if this material has a convex portion, a large number of materials cannot be stacked in parallel.

  By the way, in general, an endless band saw blade is mounted around a drive wheel and a driven wheel in a saw blade housing of a band saw machine, and is further twisted via a saw blade guide or the like, so that it is applied to the material surface. Right-angle cutting is performed. Therefore, metal fatigue occurs in the body due to the tension received from both wheels, the rotation, and the twisting force received by the guide. Or, during cutting (work cutting), metal fatigue occurs due to external force applied to the side of the saw blade due to chips entering the gap between the band saw blade and the work cutting surface, and it becomes impossible to withstand it. In some cases, chipping (tooth missing) may occur from a joint where stress is likely to concentrate, or a crack may occur from a gallet or the like where stress is likely to concentrate, resulting in cylinder rupture.

  When the above-mentioned joint (welding bead) is raised to form a convex part, the joint area (welding bead) has a significantly larger cross-sectional area than that obtained by rolling or polishing. Is also big.

  Further, when the workpiece (work) M such as a metal material is cut by the band saw blade 101, the chips 117 are always generated. Normally, the generated chips 117 are as shown in FIG. In addition, the curl is housed in a galette 121 formed between a scooping surface of the cutting edge of the band saw blade 101 and a clearance surface located in the traveling direction 119 of the band saw blade 101.

  However, some of the chips do not fit in the galette 121 even when curled when the band saw blade 101 is cut. As shown in FIG. Some may enter the gap 125 with M. In addition, depending on the material of the workpiece M, there is a case where the chips do not curl and become long like a thread, and do not fit in the galette 121 and enter the gap 125 described above.

  Despite the tooth tip biting into the workpiece M, the chips entering the gap 125 exert an external force on the side surface of the band saw blade being cut, causing chipping of the tooth tip, that is, chipping. May cause adverse effects such as an early bending phenomenon and a cut surface defect, and the external force may accelerate the progress of metal fatigue in the galette portion, which may cause early trunk fracture.

  In addition, there exist patent documents 2-4 as a prior example provided with the protrusion part which protruded from the side surface in a band saw blade.

  That is, as one method for preventing the band saw blade from being bent, saw blades having convex protrusions on the side surface of the saw blade are disclosed in, for example, Patent Document 2 and Patent Document 3. The configurations described in Patent Documents 2 and 3 exert their effects by preventing the inclination of the saw blade with respect to the material by the convex protrusions coming into contact with the cut surface of the workpiece. However, in patent document 3, the convex-shaped projection part is provided in the trunk | drum, and there exists a problem that a chip | tip penetrates between the projection part and a tooth base. That is, in the configurations described in Patent Document 2 and Patent Document 3, there is a problem in that the cutting resistance increases because the convex protrusion comes into contact with the cut surface of the workpiece.

Moreover, in the structure described in patent document 4, it combines with the advantage of a clam tooth and the wide width tooth brazed to the side of a saw blade, and it is easier than a saw body with all the wide width teeth. All blades have a cutting surface and a straight cutting surface that are superior to the blade of a set tooth, and the protruding wide-width teeth are cut to the cutting surface. The effect is demonstrated by touching. However, there is a problem that the cutting resistance increases because the protruding wide-width teeth come into contact with the cut surface as cutting teeth.
JP 2003-340644 A JP 2002-113612 A Japanese Patent Laying-Open No. 2005-088109 JP 2000-343324 A

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a band saw blade and a work piece in which a scrap generated during cutting of a workpiece is produced in a band saw blade having a different body material and blade material. Intrusion into the gap between the cutting surface and the cutting force is suppressed, and the chipping caused by breakage from the joint between the barrel and the blade and damage from the bottom of the tooth are prevented. It is an object of the present invention to provide a band saw blade capable of preventing a cylinder breakage that occurs.

  The present invention has been made in view of the above-described problems, and has a straight tooth and left and right set teeth by welding and joining the body and the blade and cutting left and right. A band saw blade, comprising a convex portion projecting from a side surface of the body material at a welded joint between the body material and the blade material, and a projecting height dimension of the convex portion from the side surface of the body material is The protrusion height dimension from the side surface of the barrel to the tip of the left and right set teeth is smaller.

  Further, a band saw blade provided by welding a hard tip to the tip portion of the saw blade that has been chopped of the barrel material, the welding joint portion including a convex portion protruding from a side surface of the barrel material, A protruding height dimension of the convex portion from the body material is smaller than a maximum projecting height dimension of the hard chip from the side surface of the body material.

  Further, in the band saw blade, the protrusion height dimension of the convex portion is such that when the work is cut by the band saw blade, chips enter the gap between the side surface of the body and the cut surface of the work in the band saw blade. It is the height dimension which prevents this.

  Further, a band saw blade having a straight tooth and left and right set teeth by welding and joining the body and the blade material and performing gear cutting, and by performing the gear cutting. Between the bottom of the formed galette and the tip of the saw blade, a convex portion protruding from the side surface of the body is provided, and the protruding height dimension of the convex portion from the side surface of the body is determined by It is characterized by being smaller than the projecting height dimension from the side surface of the material to the tip of the left and right set teeth.

  Further, in the band saw blade, the convex portion is provided between a set bending position in the left and right set teeth and a tooth tip in the left and right set teeth.

  According to the present invention, it is possible to prevent the generated chips from entering between the side surface of the band saw blade and the cut surface of the workpiece when the workpiece is cut (cut) by the band saw blade. Therefore, it is possible to solve the problem caused by the chips entering the gap between the band saw blade and the cut surface of the workpiece.

  In addition, by adopting a configuration in which the welded joint between the band saw blade body and the blade is provided with a convex portion, the strength of the welded joint can be improved, and the conventional problems as described above can be solved. Is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are explanatory views showing the band saw blade 1 according to the first embodiment of the present invention. FIG. 1 is a front view of the band saw blade 1 and FIG. 2 is an enlarged view of a section AA in FIG. FIG. 3 is an explanatory view, FIG. 3 is a view showing a state of cutting (cutting) of a workpiece (workpiece) M, and FIG. 4 is an enlarged view of a portion P in FIG.

  The band saw blade 1 shown in FIG. 1 is a bimetal band saw blade whose thickness t of the body portion 2 is 1.0 mm, the body width W is 38 mm, and the body material 14 and the blade material 15 are the same as those of the conventional band saw blade. is there.

  In addition, the inter-tooth pitch consists of 5 different tooth pitches, 2 teeth per inch and 3 teeth per inch in total, which is a non-uniform pitch (variable pitch). The amount (HL, HR) is 0.40 mm, and the set pattern includes five straight teeth 3S, left set teeth 5L, right set teeth 7R, left set teeth 9L, and right set teeth 11R.

  The band saw blade 1 is obtained by welding the band-shaped body member 14 and the band-shaped blade member 15 integrally at the weld joint 12 and then processing the galette G to perform gear cutting. 3S, 5L, 7R, 9L, and 11R are formed. The left and right set teeth 5L, 7R, 9L, and 11R are formed in the set teeth by swinging out in the left and right directions at the set bending position (setting file bending line) 13, respectively.

  The clam bending position 13 is located between the bottom GB of the galette G and the weld joint 12. In other words, the weld joint 12 is positioned between the set bending position 13 and the tooth tips of the set teeth 5L, 7R, 9L, 11R.

  In the band saw blade 1 shown in FIGS. 1 and 2, in each of the teeth (the straight teeth 3S, the left set teeth 5L, the right set teeth 7R, the left set teeth 9L, and the right set teeth 11R) having the galette G having a depth h, The weld joint 12 is provided at a position between each tooth tip and the bottom GB of the galette G and at a distance H (H = 1.5 mm) from the tooth tip toward the bottom GB side of the galette G. Yes. The weld joint 12 is provided with convex portions BL and BR projecting from both the left and right sides of the body portion 2.

  The convex portions BL and BR in the welded joint portion 12 are made of weld beads when the blade member 15 is welded to the barrel member 14, and the amount of projection (the projection height from the side surface of the barrel member 14). (TL, TR) is a dimension smaller than the height dimension (claw protrusion amount) HL, HR from the side surface of the body 14 to the tooth tips of the left and right set teeth 5L, 7R, 9L, 11R. The projecting heights TL and TR of the convex portions BL and BR are set between the cutting surface MF of the workpiece M and the gap 125 (see FIG. 3) between the side surfaces of the band saw blade 1. It is provided in the height dimension which has the function to prevent the thread-like chips generated at the time of cutting (cutting) from entering.

  Note that the protruding amounts (projecting height dimensions) TL and TR of the convex portions BL and BR from the side surface of the band saw blade 1 are about 0.1 mm for straight teeth, but in the case of set teeth, the amount of settling out As shown in FIG. 4, the gap a between the convex portions BL and BR of the set teeth and the cutting surface MF of the workpiece M is as close to zero as possible without adversely affecting the cutting work. Is preferred.

  Next, the band saw blade 1A (not shown) of the second embodiment is the band saw blade 1 of the first embodiment described above, and the protruding amount of the convex portions BL and BR is set to about 0.40 mm. The left and right set teeth are provided in the same size as the set-out amount of the set teeth, and other configurations are the same as those of the band saw blade 1.

  Next, the band saw blade 20 for comparative experiments according to the present invention will be described.

  5 and 6 are explanatory views showing a band saw blade 20 for comparative experiment according to the present invention, FIG. 5 is a front view of the band saw blade 20, and FIG. 6 is an enlarged explanatory view of a BB cross section in FIG. is there.

  The band saw blade 20 for comparative experiment shown in FIG. 5 is a bimetal band saw blade in which the body material 14 and the tooth material 15 are different, like the band saw blade 1 of the first embodiment.

  Further, the configuration of the band saw blade 20 is the same except for the configuration of the convex portions BL and BR made of weld beads formed so as to protrude from the left and right sides of the body portion 2 of the band saw blade 1. The same reference numerals are attached and detailed description thereof is omitted.

  In the band saw blade 20, a distance w (w = 3.0 mm) from the line L connecting the roots of the straight teeth 3 </ b> S and 3 </ b> S having the galette G having the largest depth h from the tooth tip in the saw back direction of the body portion 2. ) Are formed on the left and right side surfaces of the body portion 2 at positions separated from each other by a welding bead extending continuously in the longitudinal direction. That is, the convex portion f is provided between the bottom portion GB of the galette G and the back portion of the band saw blade 20.

  The protruding amount (TL, TR) of the convex portion f from the side surface of the band saw blade 20 to the left and right (TL, TR) is 0.2 mm. Note that the set-out amount of the set teeth is 0.4 mm, which is the same as that of the band saw blade 1. Further, the convex portion f is provided so as not to protrude left and right from the tips of the left and right set teeth of the band saw blade 20.

  Next, in the band saw blade 1 in the first embodiment, the band saw blade 1A in the second embodiment, the band saw blade 20 for comparison experiment and the band saw blade shown in FIGS. The results of performing a cutting performance comparison test using four types of band saw blades of the same length with a normal band saw blade (not shown) not equipped with BR will be described below.

  In the cutting test, SUS304 (18-8 stainless steel), 250φ was used as the workpiece (workpiece) M, and one cut of the workpiece M was completed in about 15 minutes at a saw speed [40 m / min]. The cutting conditions were set so that the state of the tooth tip was observed when 20 cuts were made.

  As a result, in the normal band saw blade having no convex portion, chipping (tooth missing) occurred in 10 teeth, but in the band saw blade (1, 1A) according to this embodiment, chipping (tooth missing) occurred at all. It wasn't. However, with the band saw blade 1A, a bend and a undulation pattern occurred at the end of one cut and could not be cut up to 20 cuts.

  In the cutting with the band saw blade 1A, the cause of the bending and the undulation pattern is that the convex portions provided on the left and right set teeth are swung outward from the corner portions of the set teeth. Since the width of the left and right convex parts is wider than the cutting groove in which the teeth of the set teeth open during cutting, the convex parts contact the cutting surface of the cutting material and receive excessive frictional force. Is the cause.

  Further, according to the cutting test under the same conditions by replacing the band saw blade 1, the band saw blade 20 and the normal band saw blade with a new one, the state of the tooth tip when cutting 20 cuts is 10 for the normal band saw blade. While the chipping (tooth chipping) occurred in the teeth, the band saw blade 1 and the band saw blade 20 did not generate any chipping (tooth chipping).

  Further, when the state of the cut surface at this time is observed, in the case of a normal band saw blade, the chip hits the cut surface to form a peeled surface, whereas the band saw blade 1 and the band saw blade. At 20, no such condition was observed.

  This is because, in the case of a normal band saw blade, chips generated during cutting enter the gap between the side surface of the band saw blade and the cut surface of the workpiece M, and the tooth tip bites into the material. Nevertheless, since external force is applied to the band saw blade, the joint between the body and the tooth cannot endure, and the joint breaks, resulting in chipping, and chips on the cut surface of the material. A cut surface defect due to contact has occurred.

  However, in the band saw blade 1 and the band saw blade 20, the convex portion is provided on the side surface of the band saw blade, thereby preventing chips from entering the gap between the cutting surface of the cutting material and the band saw blade. Therefore, it seems that it has become possible to suppress the occurrence of chipping (tooth missing) and defective cut surfaces.

  Since the band saw blade 20 performs bending of the settling out on the tooth tip side with respect to the protruding portion f made of the weld bead, the protruding amount (the protruding height) of the protruding portion f should be smaller than the settling amount of the set teeth. For example, the convex part f does not contact the cut surface of the material during cutting. In the case of the band saw blade 1, since the convex portion is closer to the tooth tip than the bending position of the set-up, the convex portions BL and BR are formed by welding beads in which the convex portion is formed to protrude. If the amount is not considered so as to be smaller than the amount of protrusion of the tooth tip, the convex portions BL and BR of the body portion come into contact with the cut surface of the cutting material, leading to early cutting, cutting failure, chipping (tooth missing), etc. May occur.

  In addition, the three kinds of the band saw blade 1, the band saw blade 20 and the normal band saw blade described above, and an aluminum material (A6061: heat treatment system structural alloy of Al-Mg-Si), 200φ as a workpiece M, When a cutting test was carried out at a cutting speed of 150 [m / min] under cutting conditions that could complete one cut in about 1 minute, no chipping (tooth chipping) occurred in any band saw blade. Seems to be because the material is soft.

  However, in the case of a normal band saw blade in the state of the cut surface in the case of SUS304, 250φ, the cut surface is a scraped surface that seems to have been scraped, whereas the band saw blade 1 and the band saw blade 20 No peeling surface due to such chips was observed.

  However, when the cutting test was further continued, the band saw blade 20 had an early trunk fracture from the convex portion near the tooth bottom. This is because the crystal grain size and structure of the convex part and its peripheral part are changed by welding (heat treatment) to reduce the viscosity, and the convex part is continuously formed. A convex portion is provided near the bottom of the tooth (synonymous with the bottom GB of the galette G) where stress is concentrated, and it is considered that cracks entered from the vicinity of the bottom of the tooth and led to breakage.

  However, in the case of the band saw blade 1, the convex portion is not provided in the vicinity of the tooth bottom where the stress is most concentrated due to the metal fatigue of the band saw blade, that is, the convex portion is closer to the tooth tip than the tooth bottom. Since the aluminum material (A6061: Al-Mg-Si heat-treating structural alloy), 200φ is cut under the same cutting conditions, there is no flaking state due to chips. It was confirmed that since the workpiece M was an aluminum material, chipping (tooth chipping) did not occur, and early trunk fracture due to trunk fatigue did not occur.

  Next, the band saw blade 1 described above, and the band saw blade A (not shown) having a convex portion flattened by polishing the welded joint of the body and teeth of the band saw blade having the same configuration as the band saw blade 1, When three types of band saw blades B (not shown) in which the welded joints are flattened by rolling are prepared and the cross section of the welded joints of each band saw blade is observed, as shown in FIG. 9, as shown in FIG. , (B), (c), the same cross-sectional shape was observed.

  Using the three band saw blades 1, the band saw blade A, and the band saw blade B having the cross-sectional shapes of the three types of weld joints described above, a flat bar having a workpiece M of SS400 and 200w × 36t is shown in FIG. As shown in the figure, it is fixed to a fixed vise V of a band saw (not shown), and the cutting amount per tooth of the saw blade is gradually increased at a constant speed of the saw speed [60 m / min] (speed in the cutting direction). The cutting test was carried out by gradually increasing the load during cutting by gradually increasing.

  As a result, when the band saw blade B with the welded joint flattened by rolling is cut under the condition that one cut is finished in about 40 seconds, the chipped portion is removed from the bead of the welded joint between the body and the blade. On the other hand, when the band saw blade A with the welded portion polished and flattened convex portion is cut under the condition that one cut is finished in about 33 seconds, the welded joint between the body and the blade Tooth chipping occurred from the bead part of the part, and when the band saw blade 1 was cut under the condition that one cut was completed in about 26 seconds, tooth chipping occurred from the bead part of the welded joint of the body and blade material. .

  From the above cutting test, it is determined that the band saw blade 1 that has no teeth until the fastest cutting speed has the highest strength because the saw speed is constant and the welded joint between the body 14 and the blade 15 is the fastest. it can.

  As can be seen from the observation of the cross-sectional shape and cross-sectional area of the three types of joints shown in FIG. 9 (a, b, c), the band saw blade B with the weld joint 111 flattened by rolling is: A recess 115 as shown in FIG. 9C may occur. Accordingly, the band saw blade B has the result that the strength of the weld joint 111 is the weakest among the three types of the band saw blade 1, the band saw blade A, and the band saw blade B.

  Next to the band saw blade B, the strength of the welded joint portion 111 was weaker in the band saw blade A with the convex portion flattened by polishing the welded joint portion 111, and the weld welded portion 111 was the strongest in the band saw blade. 1 is understood to be due to the largest cross-sectional area of the weld joint 111.

  In the above description of the embodiment, a so-called bimetal band saw blade having a different material from the body material and the tooth material has been described as an example. However, a band saw blade having the same body material and tooth material (having no weld joint). ), Band saw blades having pitch configurations other than five, band saw blades having different patterns and clashes, protrusion amounts, band saw blades having a difference in height of tooth tips, circular saws, etc. Similar effects can be expected.

  By the way, the present invention is not limited to the above-described embodiments, and can be implemented in other forms by making appropriate changes. That is, in the above description, the case where the convex portion is formed or the case where the convex portion is formed by the welding bead is illustrated. However, it is also possible to adopt a configuration in which an appropriate resin is linearly adhered and welded to both sides of the band saw blade and then solidified integrally.

  In addition, the band saw blade is not limited to the band saw blade with left and right set teeth that are set out in the left and right direction, but a hard tip such as a dovetail-shaped carbide tip with a wide tooth tip is welded (low contact). There is also a band saw blade provided. This type of band saw blade 41 is already known, but as shown in FIG. 12, hard tips 45A, 45B, and 45C having various dovetail shapes with a wide tooth tip are welded to the tip of the saw tooth 43. It is the structure which joined.

  Therefore, the weld bead when the hard tips 45A, 45B, 45C are welded to the tip of the saw tooth 43 can be provided as the convex portion 47. In this case, the protruding height of the convex portion 47 in the left-right direction from the side surface of the body 41A in the band saw blade 41 is the tooth in the hard tip 45A having the largest width in the left-right direction in each of the hard tips 45A to 45C. The tip portion C is provided smaller than the protruding height dimension protruding in the left-right direction from the side surface of the body 41A.

  Even in such a configuration, the same effect as that of the band saw blade described above can be obtained.

Explanatory drawing (front view) of the band saw blade which concerns on embodiment of this invention. Expansive explanatory drawing of the AA cross section in FIG. Explanatory drawing which shows the cutting state by the band saw blade which concerns on embodiment of this invention. Explanatory explanatory drawing of the P section in FIG. Explanatory drawing (front view) of the band saw blade 20 of 3rd embodiment which concerns on this invention. FIG. 6 is an enlarged explanatory view of a BB cross section in FIG. 5. The figure explaining the cutting state of the flat bar whose work material M is SS400, 200wx36t in the cutting test using the band saw blade 1 which concerns on this invention. It is a figure explaining an example of the structure of the conventional bimetal band saw blade, FIG.8 (a) is a front view of the band saw blade 101, FIG.8 (b) is a bottom view, FIG.8 (c) is FIG.8 (a). Right side view. FIG. 9A is a cross-sectional view of a weld joint portion of the conventional bimetal band saw blade 101, FIG. 9A is a cross-sectional view of a bead of the weld joint portion 111, and FIG. The figure which shows the state which carried out, FIG.9 (c) is a figure which shows the state of a cross section when the bead of the welding junction part 111 is rolled and made flat. The figure which showed the state of the chip 117 at the time of cut | disconnecting the workpiece M, such as a metal material, with the conventional bimetal band saw blade 101, and sectional drawing which looked at the band saw blade 101 from the front direction. The figure which showed the state of the chip | piece 117 which did not fit in the galette at the time of cutting the workpiece M, such as a metal material, with the conventional bimetal band saw blade 101, and sectional drawing seen from the band saw blade 101 advancing direction. It is explanatory drawing which shows the band saw blade provided with the dovetail-shaped hard tip.

Explanation of symbols

1, 20, 101 Band saw blade 2 Body 3S, 3SA Straight teeth 5L Left set teeth 7R Right set teeth 9L Left set teeth 11R Right set teeth 12 Welded joints 13 Settle bending position 14 Body 15 Cutting material a Convex on set teeth Gap between shaped parts (BL, BR) and workpiece M h Depth from tip of galette G t Thickness of body part 2 BL, BR Convex part L Straight teeth 3S, 3SA Line H Distance from convex part of convex part (BL, BR) TL, TR Projection amount of convex part of straight tooth G Galette M Work material V Fixed vise W Body width GB Bottom part of galette

Claims (5)

  A band saw blade having a straight tooth and left and right set teeth by welding and joining the body and the blade and cutting teeth and taking out the left and right claws, and comprising the body and the blade The weld joint includes a convex portion protruding from the side surface of the body, and the protruding height dimension of the convex portion from the side surface of the body is determined by the teeth of the left and right set teeth from the side surface of the body A band saw blade characterized by being smaller than the protruding height dimension.   A band saw blade provided by welding and joining a hard tip to a tip of a saw blade that has been cut into a body, wherein the weld joint includes a convex portion protruding from a side surface of the body, and the body The projecting height dimension of the convex portion from the band saw blade is smaller than the maximum projecting height dimension of the hard tip from the side surface of the body.   The band saw blade according to claim 1 or 2, wherein the protruding height dimension of the convex portion is a gap between a side surface of the body and a cut surface of the workpiece in the band saw blade when the workpiece is cut by the band saw blade. Band saw blade characterized in that it has a height dimension that prevents chips from entering.   A band saw blade having a straight tooth and left and right set teeth by welding and joining the body and blade material and cutting out the left and right, and formed by cutting the gear. A convex portion projecting from the side surface of the body member between the bottom of the galette and the tip of the sawtooth, and the projecting height dimension of the convex portion from the side surface of the body member is A band saw blade having a height smaller than a protruding height dimension from the side surface to the tooth tips of the left and right set teeth.   5. The band saw blade according to claim 4, wherein the convex portion is provided between a set bending position in the left and right set teeth and a tooth tip in the left and right set teeth. 6.

Images