JP5050043B2 - Band saw blade - Google Patents

Description

  The present invention relates to a band saw blade used for cutting and cutting various materials.

  Band saw blades are cut straight on both side edges of a steel plate to form a saw blank, and a tooth shape is created with a toothbrusher at the tooth edge of the saw blank, and then both ends of the saw blank are joined together to endlessly. The band saw blade. Then, a waistline for generating a tension band at the tooth edge and the back edge of the band saw body and a backrest for generating a tension difference between the tension band at the tooth edge and the tension band at the back edge. In addition, horizontal finishing is performed to remove the distortion generated in the band saw blade. After that, claws are attached to the tips of the extracted tooth molds, and finally the teeth are polished to produce band saw teeth. When the band saw teeth are used, not only the teeth wear but also the horizontal distortion described above. No, it is known from Non-Patent Document 1 that a change in the degree of waist placement and the amount of backfilling occurs, so that the finishing is performed each time.

  In the conspicuous finishing of the band saw blade, waisting and back filling are performed by so-called roll hanging by extending a rolling roll on the portion where the tension of the band saw body is to be lowered. This is a very subtle work that results in slightly different results and is very subtle.In addition, if the back is raised after the waist is placed properly, the tension at the back edge decreases, so the degree of waist change changes. If you refit your back and return it to the proper level, the amount of backfilling will become inadequate. Is performed by a skilled conscientious person who has gained many years of experience, but the skilled conscientious person will leave the site due to aging and will eventually disappear, so as a countermeasure against it, the band saw tooth back support Automatic band saw roll machine (Patent No. 290326) ) Has been invented Now the market provides. However, when this machine is used, a large amount of equipment costs are required, and the industry strongly demanded the emergence of a band saw tooth that can provide an appropriate waist insertion and back filling effect without making such capital investment.

Band sawing technology, sawmill theory and practice Japan National Forestry Improvement Dissemination Association November 1, 1976 Issued 4th edition

  The present invention has been made to satisfy the above-mentioned demands, and is a skilled conscientious person by manufacturing a band saw blade by joining saw materials cut into polygons that are rounded or approximate to both sides. It is an object of the present invention to provide a band saw blade that can easily make a new band saw blade and a conspicuous finish using existing equipment.

  The band saw blade according to the present invention is intended to solve the above problems by employing the following technical means.

  In the invention according to claim 1, the band sawtooth material band steel is obtained from the back edge portion radius and the tooth edge portion radius obtained on the basis of the backfill amount of the band saw blade to be manufactured, or a polygon approximate to these radiuses. By cutting both side edges so that a saw material is formed and joining both ends of this saw material, a band saw body with a diameter difference that fulfills the function of the back of the tooth edge part and the back edge part is obtained. It is characterized by.

  Advantages of the Invention According to Claim 1 When the both side edges of the saw material are cut into a round shape of the back edge portion and a round portion of the tooth edge portion obtained based on an appropriate backfill amount of the band saw blade, or a polygon approximate to these round portions. Because the band saw body made by joining this saw material has a slight diameter difference between the tooth edge and the back edge, when it is tensioned by hanging on the upper and lower saw wheels of the band saw machine, Due to the above diameter difference, the tension at the tooth edge is greater than the tension at the back edge, and the back edge of the band saw blade only generates heat due to friction with the material, whereas the tooth edge is subject to material cutting and friction. Therefore, even if the elongation due to thermal expansion is larger than that of the back edge, the diameter is smaller than that of the back edge as described above. It fulfills the back-up effect without bending. Therefore, in the conspicuous finishing of the band saw blade, the horizontal finishing of the band saw body is performed and the waist insertion is performed, or even if only the horizontal finishing is omitted and the waist insertion is omitted, the back filling effect due to the above-mentioned diameter difference makes it suitable Because it has a large amount, it can be easily and quickly used even by workers who are not skilled in new band saw blades and sharpening finishes that were previously only possible for skilled conscientists with many years of experience. The existing equipment is sufficient, and there is no need for capital investment.

The perspective view which shows the band sawtooth concerning this invention. Explanatory drawing which calculates | requires the radius of a back edge part and a tooth edge part of a band saw blade same as the above from a back gauge. Explanatory drawing which calculates | requires the distance between both based on R and a chord line same as the above. (1) (2) (3) (4) is a plan view showing a band sawtooth material band steel and a saw material formed from this material band steel. Explanatory drawing which shows the waist insertion state of a band saw body same as the above. Explanatory drawing of the side view which suspended the completed band sawtooth to the saw wheel.

  Embodiments of a band saw tooth according to the present invention will be described below with reference to the drawings.

  In FIG. 1, symbol A indicates a band saw tooth according to the present invention. This band saw blade A is a radius that matches the radius R1 of the back edge portion 2 and the radius R2 of the tooth edge portion 3 determined based on the backfilling amount that is appropriate for the band saw blade for manufacturing the material band steel 1. A saw blank 4 is formed by cutting both side edges so as to form a polygon that approximates a round shape, and the saw blank 4 is joined to both the end 5 and the end 6 to be connected to the tooth edge 3 and the back edge 2. A band saw 7 having a slightly conical shape due to a difference in diameter that functions as a fill is produced, and the band saw 7 is sharpened as described later to obtain a band saw tooth A.

  The material band steel 1 is made of a material having characteristics necessary for a band saw blade and is formed into a thin band shape and wound into a roll, and is cut into a dimension corresponding to the length of the band saw blade A, as shown in FIG. A square plate as shown is formed, and a plurality of saw blanks 4 can be taken from this square plate.

The sides R1 and R2 when cutting the both side edges of the material band steel 1 (parts that become the back edge portion 2 and the tooth edge portion 3) into a polygon or a polygon approximate to this are the band saw teeth A to be manufactured. It calculates | requires based on the back gauge 8 which measures an appropriate backfill amount. As shown in FIG. 2, the back gauge 8 is an arrow height that is the distance from the midpoint of a straight string L connecting the point a that contacts one of the back edges 2 of the band sawtooth A and the point b that contacts the other to the apex of Earl. S is measured to determine whether or not the back amount is appropriate. Therefore, the back gauge 8 can obtain the radius R1 of the radius of the back edge 2 from the value L1 half the length of the string L and the arrow height S by the following formula.
R1 = L1 ² / 2S
Further, the radius of the radius of the tooth edge 3 is obtained by subtracting the width of the band saw blade 5 from the radius of the radius of the back edge 2 obtained by the above formula.

  If the radii R1 and R2 for cutting the back edge portion 2 and the tooth edge portion 3 into rounded shapes are obtained, the material strip steel 1 is either rounded with radii R1 and R2 on both sides, or approximate to these rounded R1 and R2. Although the saw material 4 is formed by cutting so as to form a polygonal shape, since an equipment capable of cutting is not provided, an approximate polygon cutting is performed, and the material strip steel 1 is a series of materials. In some cases, the existing equipment cannot be cut, so the material strip 1 is divided into two parts and processed in half, and the CAD is used prior to processing, as shown in FIG. An arc a having a radius R1 of the radius of part 2 is drawn, and a straight line (string line) d connecting both end points b and c of a distance corresponding to the length of the material strip steel 1 divided into the arc a is drawn. A straight line (string line) d is equally divided at a pitch of 10 mm, for example, and these equal dividing lines e1 to By calculating the coordinates of the intersections where en intersects the arc a and the straight line (chord line) d, the length of each equally divided e1 to en of the back edge 2 that sets the feed of the blade is obtained, and the tooth For the edge 3 as well, the length of each equally divided portion of the back edge 2 for setting the blade feed is obtained based on the radius R2 of the tooth edge 3 obtained by subtracting the width of the material strip 1 from the radius R1. Based on these values, a program is set up to move the blade forward and backward by the change in the distance between adjacent equal dividing lines while the material strip 1 is fed 10 mm, and machining is performed at the machining center, as shown in FIG. Cut into a polygon approximate to the radius of the radii R1 and R2 to form two half saw materials 4 and 4 as shown in FIGS. 4 (2) and 4 (3). So that the saw material 4 having the required length shown in FIG. 4 (4) can be obtained. But was, in the stage of full-scale production to allow efficient formed by introducing a facility saw material 4 can radius rounded cutting also described above in series.

  The formed saw blanks 4 and 4 are saw teeth having a shape and a pitch suitable for a sawmill as shown in part of FIG. Ten prototypes are formed by punching.

  The above-mentioned saw material 4 on which the original shape of the saw tooth 10 is formed is obtained by shaving the two edges 5 and 6 obliquely so as to increase the joining area, and superimposing them, and brazing, welding, etc. as shown in FIG. An endless band saw 7 is formed, and the band saw 7 has different diameters of the back edge 2 and the tooth edge 3, has a slightly conical shape, and has a tooth edge part 3 larger than the diameter of the back edge 2. Since the diameter of the band saw is reduced, the band saw body 7 having the function of the back is formed.

  If the formed band saw blade 7 is not in a straight plane state with no longitudinal or lateral strain, the saw through the material will be poor and the accuracy and efficiency of the sawmill will be deteriorated. Therefore, the strain is detected using a known straight gauge. Then, according to the position and form in which the distortion is generated, the strained portion is hit with a known hammer, or is rolled with a known roll machine, thereby performing horizontal finishing to obtain a flat band saw body 7 without distortion.

  The horizontal-finished band saw 7 generates heat due to friction with the material at the time of grinding, and the tooth edge 3 also generates heat due to the cutting resistance of the material. Higher, lower in the middle and back edge 2 goes up again. In this state, the tooth edge portion 3 and the back edge portion 2 of the band saw body 7 undergo thermal expansion and the tension force decreases, so this phenomenon is prevented and the tension force between the tooth edge portion 3 and the back edge portion 2 is reduced to the central portion. In order to raise it further, the center part of the band saw body 7 is rolled to reduce the tension of this part, and the waist insertion that produces the tension bands 11 and 12 at the tooth edge part 3 and the back edge part 2 as shown in FIG. Using a roll machine, roll the intermediate part sandwiched between the tension bands 11 and 12 from the tooth edge part 3 side to the back edge part 2 side at an appropriate pressure and interval, and then turn the band saw blade 7 upside down. By rolling between the rolled portions from the front side, the tension between the tension bands 11 and 12 is performed so that the tension in the central portion decreases.

  The above-described band saw blade 7 is formed with a tooth profile that adjusts the original saw blade 10 formed by tooth extraction into a shape that gives the best grinding result according to the type of grinding material, etc. To form the tooth mold, a known conspicuous machine is used to feed the band saw blade 4 intermittently, and every time the band saw blade 4 stops, the grinder is cut into the toothed original saw tooth 10 so that all A tooth mold for aligning the saw teeth 10 in a fixed shape is formed.

  The band saw blade 4 with the tooth shape formed on the saw blade 10 performs a set-up operation in order to widen the material path more than the band saw blade 7 and reduce friction between the band saw blade 7 and the material. For this set-up, using a known set-up device, the tip of each saw tooth 10 is alternately distributed to the left and right every other tooth, and the set-up is performed to widen the road.

  The band saw blade 7 that has been put out is polished to sharpen the cutting edge of the saw blade 10. In this polishing, a known conspicuous machine is used as in the tooth mold formation, and the band saw blade 4 is intermittently fed, and each time the band saw blade 4 stops, the grinder is cut into the saw blade 10 to sharpen the tooth tip sharply. Polish.

  The band saw blade A manufactured through the above steps is suspended from the upper and lower saw wheels 13 and 14 shown in FIG. Then, the band saw blade 9 has a difference in diameter generated between the tooth edge portion 3 and the back edge portion 2, and the tension force of the tooth edge portion 3 becomes larger than the tension force of the back edge portion 2, so Since the cutting heat is added to the frictional heat on the 3 side, even if the heat generation is higher than the back edge 2 side where only the frictional heat is generated and the decrease in the tension due to the amount of thermal expansion is larger than the back edge 2, the tension is reduced. Since it functions larger than the edge 2 and does not cause buckling of the band saw blade 9, it can be ground with the same conditions as when the back is built, even if the back is not placed. Since the material is made, the same product quality and sawing efficiency as the conventional ordinary band saw blades are obtained, and the band saw usage time is also the same. It was confirmed that it was obtained for practical use.

  Since the band saw blade A according to the present invention has achieved an unexpected result as described above, the band saw blade A is formed by considering that it is possible to eliminate not only the back filling but also the waist insertion. 7 is applied in the same manner as in the above embodiment until the horizontal finish is applied, omits the waist saw 7 after the horizontal finish, forms a tooth profile that aligns the tooth profile of the formed saw blade, and causes the tooth tip to swing left and right. Then, a sharpening of the tooth tip was made to make a finished band saw tooth A, and this band saw tooth A was suspended from the upper and lower saw wheels 13 and saw wheel 14 as shown in FIG. I saw it while driving in the state and sawing. As a result, the band saw blade A is stabilized at a fixed position of the upper and lower saw wheels 13 and 14 due to the tension difference generated by the diameter difference between the tooth edge portion 3 and the back edge portion 2, and the temperature rise of the band saw blade A is caused by the sawn timber. It is possible to continue to maintain stability and to grind the material with the same accuracy and speed as the band saw blade A that has been cut into the material, and the band saw blade A according to the present invention is not only back-filled It was confirmed that even if the waist was omitted, it could be put to practical use.

(Experimental example 1)
The band saw tooth A to be tested has a width of 178 mm, a thickness of 1.25 mm, and a length of 7600 mm. In order to manufacture the band saw blade, first, the material band steel 1 is cut to form the saw blank 4, so that the radiuses R1 and R2 of the cutting radius are used for inspecting the backstrip amount of the band saw blade of the same size. It calculated | required using the back gauge 8 to do. That is, as shown in FIG. 2, the half length L1 and the arrow height S of the chord length L of the back gauge 8 are measured, the half length L1 of the chord length L is 335 mm, and the arrow height S is 0.3 mm. It was confirmed. From these values, R1 is calculated to be 187041.66 mm based on the above formula R1 = L ₁ ² / 2S, and the radius of the radius R2 of the tooth edge portion 3 is the radius 187041.66 mm of the radius R1 of the back edge portion 2. From this, the width 178 mm of the band saw blade 7 was subtracted to obtain 18686.66 mm.

  Next, with the long material strip 1 having a length of 7600 mm, the existing equipment cannot perform polygon cutting that approximates the radius, so the material strip 1 has a dimension obtained by adding a joining allowance to 3800 mm, which is half of the above 7600 mm. I used one. And as described above, Table 1 is a table of changes in coordinates of the back edge 2 and the tooth edge 3 that are the basis of a program for moving the blade forward and backward with respect to the fixed feed of the material strip 1 using CAD. Created as shown in Table 2 and a machining center program based on Tables 1 and 2 is used to cut the material strip 1 so that the back edge 2 and the tooth edge 3 are similar to the above R1 and R2. By cutting so as to form a square, two saw blanks 4 and 4 are formed as shown in FIGS. 3 (2) and 3 (3), and an oblique joining surface 9 is formed at the corresponding ends of the two saw blanks 4 and 4. 9 is formed, and the joining surfaces 9 and 9 are brazed and joined by welding or the like to obtain a saw blank 4 having a length of 7600 mm as shown in FIG.

  When the saw blank 4 is formed as described above, a saw tooth 10 as shown in FIG. The prototype was formed.

  The saw material 4 that has been formed with a prototype of the sawtooth 10 by tooth extraction forms oblique joint surfaces 13 and 14 at both end edges 5 and 6, and these joint surfaces 13 and 14 are overlapped and joined with a known brazing, An endless band saw blade 7 as shown in FIG. Since the band saw blade 7 is formed by cutting the back edge portion 2 and the tooth edge portion 3 into a polygon that approximates the radius R1 and the radius R2, the back edge portion 2 has a diameter larger than that of the tooth edge portion 3 when joined. Since the diameter of the band saw 7 is slightly conical and the curvature of the back edge line 3 is measured with the back gauge 8 when viewed from the back gauge 8, it has an arrow height of approximately 0.3 mm. It was confirmed that it was in the same state as a normal band saw tooth that was filled.

  Therefore, the band saw 7 is inspected horizontally, and a portion with distortion is hit with a hammer as is known in accordance with the shape of the distortion or the position where the distortion occurs, or is rolled by a roll machine to remove the distortion and level. Finished.

  The band saw 7 that had been subjected to the horizontal finishing was stretched using a known roll machine in order to generate tension bands at the tooth edge portion 3 and the back edge portion 2. As shown in FIG. 4, this waist placement is about 20% of the width of the band saw blade 7 at the tooth edge portion 3 and about 15% of the width of the band saw blade 7 at the back edge portion 2. As shown by the solid line in FIG. 4 from the front side, seven rolls are applied at almost equal intervals over the entire circumference, and when the front side rolls are finished, the band saw body 7 is turned over and the solid roll rolls are made from the front side. In the meantime, as shown by the chain line, the roll application was carried out so that the pressure was gradually higher than the both end sides as is well known, and the backfilling operation usually performed after the waist insertion was not performed.

  The band saw blade A that has been placed into the waist is formed into a tooth shape that adjusts the original saw tooth 10 made by tooth extraction to a shape suitable for the material using a known conspicuous machine, and then the shape is adjusted. In order to sharpen the blade edge of each saw-tooth 10 that has been set out, and to sharpen the blade edge of each saw-tooth 10 that has been set out, it is known that 1 was used to sharpen the tooth tip of the saw blade 10 to complete the blade saw blade A as shown in FIG.

  The completed band saw blade A is applied to the saw wheels 15 and 16 of the lumber machine, which shows only the saw wheels 13 and 14 by omitting the machine body in FIG. Since the function of the back is obtained by the difference in diameter between the tooth edge portion 3 and the back edge portion 2, the tooth edge portion 3 maintains an appropriate tension even if the band saw blade 7 generates heat due to the grinding material. Since it does not buckle, there is no grinding and accurate grinding is performed smoothly, the efficiency of the sawing is good, and the time that the band saw blade can be used is the same as the conventional band saw blade. It is used every other week for replacement, and it is used for more than 2 months without polishing the back, as well as polishing the cutting edge that has become uncut when not in use. There was no change in the accuracy and efficiency of the material, and it was confirmed that the band saw blade can achieve the intended purpose.

(Experimental example 2)
In this experimental example, it was demonstrated in Experimental Example 1 that the band saw blade A according to the present invention can omit the backfill, and it was recognized that the performance was the same as that of the conventional band saw blade in the subsequent practical test. The band saw tooth A of the same size as the experimental example 1, two material steel strips 1 half the length of the size, and the tooth edge and back edge are set to be set. After cutting into a recent polygon, it is joined to form a single saw blank 4. The original shape of the saw blade 10 is formed on the tooth edge of the saw blank 4. By joining both ends of the saw material 4 on which the original shape of the saw tooth 10 is formed, a slightly conical shape is formed, thereby forming an endless band saw body 7 that can provide a backfill effect. The band saw 7 is inspected horizontally to remove the distortion. The above steps were made in the same manner as in Experimental Example 1, and the original saw blade 10 was finished into a tooth shape suitable for the ground material without placing the band saw body 7 into the waist. By sharpening sharpening, we have completed the band sawtooth A that eliminates not only the back but also the waist.

When the completed band saw blade A is hung on the saw wheels 15 and 16 of the sawing machine, which shows only the saw wheels 13 and 14 with the machine body omitted in FIG. Since the function of the back is obtained by the diameter difference between the edge 3 and the back edge 2, the band saw 7 is not buckled because the tooth edge 3 does not buckle even if heat is generated by the sawmill. Accurate timber that does not cause bending even if it does not fit is smoothly performed, the efficiency of the timber is good, and the time that the band saw blade can be used is the same as that of the band saw blade of Experimental Example 1, It has been confirmed that the band saw blade of the present invention can be used for practical sawing without performing the insertion that is considered to be an indispensable requirement in the saw saw using the band saw blade.
By the way, the ground lumber according to this experimental example is obtained by grinding an American fir with a diameter of 45 cm and a length of 2 m to a ground width of 30 cm, and the ground lumber speed is 28 m / min. Also in the comparison of the state and the like, it was not inferior to the band saw tooth A of Experimental Example 1.

  The present invention improves the band saw blade so that both the backfilling work and the backfilling and waisting work can be omitted, and it is possible to produce and sharpen the band saw blade with excellent grinding performance even if it is not an expert. Realize that.

A Band saw blade 1 Material band steel 2 Back edge 3 Tooth edge R1 Radius radius of back edge R2 Radius radius of tooth edge 4 Saw material 5 One edge 6 Other edge 7 Band saw body

Claims (1)

The material of the band saw blade is cut on both side edges so that the back edge of the band saw and the tooth edge of the band saw obtained on the basis of the backsaw amount of the band saw blade to be manufactured or a polygon approximate to these ares. Forming saw material,
A band saw tooth characterized in that a band saw body in which a difference in diameter that fulfills the function of back filling occurs in the tooth edge portion and the back edge portion by joining both ends of the saw material.

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