JP6655688B1 - Rotary cutter and manufacturing method thereof - Google Patents

Abstract

An object of the present invention is to replace only a cutter body in which chipping or the like has occurred among a plurality of cutter bodies, thereby improving the workability of replacing the cutter body. A rotary cutter (11) is rotatably mounted on a tip of an arm of a bark removing machine via a rotary shaft (14). The rotary cutter 11 has a cylindrical cutter holding member 31 that is spline-fitted to the rotary shaft 14, and a cutting blade portion 32 b that projects radially outward from an outer peripheral surface of the cutter holding member 31. A plurality of cutter bodies 32 are detachably attached to an outer peripheral portion of the base 31 at predetermined intervals in a circumferential direction. [Selection diagram] Fig. 1

Description

  The present invention relates to a rotary cutter rotatably attached to a tip of an arm of a bark removing machine, and a method for manufacturing the rotary cutter.

  BACKGROUND ART Conventionally, bark peeling cutters in which a blade body is formed on a surface of a cylindrical cutter main body by projecting a blade body from the cutter main body have been disclosed (for example, Patent Document 1 (Claims 1 to 4, paragraphs [0010], [0010] 0012], and FIGS. 1 to 4).). In this bark-cutting cutter, the cross-sectional shape of each blade body is formed symmetrically left and right, and is rotatably attached to the arm tip of a rotary barker (bark-cutting machine). The blade body is formed in a plurality of ridges on the surface mainly of the cutter. Further, an inner flange is provided on the inner peripheral surface of the cutter main body, and the inner flange and the outer flange of the boss portion are connected and fixed by bolts. Further, the cutter is coupled to the drive shaft by inserting the boss into the drive shaft and then screwing the lock nut into the male screw portion of the drive shaft. In addition, the cutter main body and the boss portion may be formed in an integrated structure.

  With the bark cutter constructed in this way, when bark peeling work is performed, the corners of the blade are worn, and when the bark peeling function is reduced, the bolt is removed and the inner flange of the cutter main body is attached to the boss portion. After the cutter is removed from the outer flange, the cutter is turned over, and the inner flange mainly including the cutter is attached to the outer flange of the boss again. As a result, when the bark is stripped at the corner of the blade, the bark stripping function is restored. As described above, since the shape of the blade body provided on the surface of the cutter main body is formed symmetrically, there are two corners where one blade body performs the stripping operation, and one corner is worn. Even in this case, the stripping operation can be continued simply by changing the direction of the blade body. Therefore, by polishing two corners at a time, the number of polishing operations can be reduced to half of that in the related art, so that the efficiency of bark removing operation is improved. If the cutter main body and the boss are formed as an integral structure, remove the lock nut, pull out the cutter from the drive shaft, turn the cutter over and insert it back into the drive shaft, and then insert the lock nut into the male screw of the drive shaft. Screw together.

JP-A-8-85105

  However, in the bark peeling cutter disclosed in the above-mentioned conventional Patent Document 1, when the inner flange mainly of the cutter and the outer flange of the boss portion are connected and fixed by bolts, the inner flange mainly of the cutter is attached to the outer flange of the boss portion. When mounting, the cores of both flanges are easily displaced.If the cores are mounted with the cores displaced, the cutter will run around and abnormal vibration will occur, so it will take a lot of time to match the cores of both flanges. There was a problem that the workability of turning over work and replacement work was reduced. Further, in the bark peeling cutter disclosed in the above-mentioned conventional patent document 1, when the main body of the cutter and the boss portion are formed in an integral structure, the boss portion and the drive shaft are fitted by spline fitting. It takes a lot of time to insert and remove the cutter from the drive shaft, and there is a problem that the workability of turning over and replacing the cutter is reduced. Further, in the cutter for bark stripping shown in the above-mentioned conventional Patent Document 1, the cutter can be used upside down by forming the cross-sectional shape of each blade of the cutter symmetrically, but one corner of the blade is used. When chipping, cracking or wear occurs, and chipping, cracking or wear occurs at the other corner of the plurality of blades, it is not possible to replace only the chipped blade, and it is necessary to replace the cutter itself. In addition, since the cutter itself is relatively large, there is also a problem that a large storage space for a spare cutter must be secured.

  A first object of the present invention is to provide a rotary cutter and a method of manufacturing the rotary cutter, which can replace only a cutter body in which chipping or the like has occurred among a plurality of cutter bodies and can improve workability of replacing the cutter body. A second object of the present invention is to provide a rotary cutter and a method of manufacturing the rotary cutter, which can replace only a relatively small cutter body in which chipping or the like has occurred among a plurality of cutter bodies, whereby a spare cutter body can be stored in a relatively narrow place. It is to provide a method. A third object of the present invention is to form a cutter body by a lost-wax precision casting method so that a hard or sticky steel type suitable for a dry state of wood (raw wood) can be selected as a material of the cutter body. It is to provide a manufacturing method of. A fourth object of the present invention is to produce a cutter holding member with good dimensional accuracy by producing a holding member piece of the same shape and size by laser cutting a metal plate and laminating these holding member pieces. An object of the present invention is to provide a method for manufacturing a cutter.

As shown in FIGS. 1, 4 , 9 and 11 to 17, a first aspect of the present invention is a rotatable mounting via a rotary shaft 14 to a tip of an arm 13 of a bark removing machine 12. A rotary cutter 11 having a cylindrical cutter holding member 31 that is spline-fitted to the rotary shaft 14, and a cutting blade portion 32 b protruding radially outward from an outer peripheral surface of the cutter holding member 31. A plurality of cutter bodies 32 detachably attached to the outer peripheral portion of the member 31 at predetermined intervals in the circumferential direction, and the cutter holding member 31 is provided at predetermined intervals in the circumferential direction on the outer peripheral surface. Each of the cutter bodies 32 has a plurality of recesses 31f extending in the axial direction of the rotary shaft 14, and each of the cutter bodies 32 is formed in the recess 31f of the rotary shaft 14 in the axial direction of the rotary shaft 14. From Each has a mounting portion 32a that can be inserted, and a cutting blade portion 32b that is formed integrally with the mounting portion 32a while extending in a direction inclined by a predetermined angle with respect to the longitudinal direction of the mounting portion 32a. A plurality of cutter bodies 32 are attached to the cutter holding portion 31 by the both sides of the plurality of attaching portions 32a being sandwiched by the pair of sandwiching plates 33 and 34 in a state where the attaching portions 32a are inserted into the respective concave stripes 31f. It is characterized by having.

According to a second aspect of the present invention, as shown in FIGS. 1, 9, and 11 to 13, a metal plate having a predetermined thickness is laser-cut so that a predetermined distance is circumferentially provided on the outer peripheral surface. Forming a plurality of holding member pieces 31a of the same shape and the same size in which a plurality of recessed grooves 31e are formed, and laminating the plurality of holding member pieces 31a to connect the recessed grooves 31e to form a concave streak. A step of manufacturing the cutter holding member 31 having the formed 31f, and integrally molding the mounting portion 32a that can be inserted into the concave streak 31f with the cutting blade portion 32b by the lost wax precision casting method, and then quenching the plurality of cutter main bodies 32. In the manufacturing process, the plurality of cutter bodies 32 are held by the cutter holding members 31 by sandwiching both surfaces of the plurality of attachment portions 32a with the pair of sandwiching plates 33 and 34 with the respective attachment portions 32a inserted into the respective recesses 31f. Mounted on A method for producing a rotary cutter 11 and a step.

  In the rotary cutter according to the first aspect of the present invention, a cylindrical cutter holding member is spline-fitted to a rotary shaft, and a plurality of cutter bodies are detached from the outer peripheral portion of the cutter holding member at predetermined circumferential intervals. Since the attachment is possible, only the cutter body in which chipping or the like has occurred among the plurality of cutter bodies can be replaced. As a result, the workability of replacing the cutter body can be improved. Further, since each cutter body is relatively small, a spare cutter body can be stored in a relatively narrow place.

Further, in the rotary cutter according to the first aspect of the present invention, the mounting portions of the plurality of cutter bodies are inserted into the plurality of recesses of the cutter holding member, and in this state, both surfaces of the plurality of mounting portions are paired with a pair of holding plates. Since the plurality of cutter bodies are attached to the cutter holding member by being clamped, the cutter body can be replaced by a simple operation of removing one of the pair of clamping plates and attaching the other clamping plate again. . As a result, the workability of replacing the cutter body can be further improved.

In the method for manufacturing a rotary cutter according to the second aspect of the present invention, the same shape in which a plurality of concave grooves are formed at predetermined intervals in the circumferential direction on the outer peripheral surface by laser cutting a relatively thin metal plate. A large number of large holding member pieces are produced, and the holding member pieces are laminated to produce a cutter holding member in which concave grooves are connected to form a concave streak. Can be produced. In addition, since the mounting part that can be inserted into the concave strip is integrally formed with the cutting blade part by the lost wax precision casting method and then quenched to produce a plurality of cutter bodies, the hardness and the stickiness suitable for the dry state of the wood (raw wood) Can be selected as the material of the cutter body. Furthermore, since the plurality of cutter bodies are attached to the cutter holding member by sandwiching both surfaces of the plurality of attachment portions with the pair of holding plates in a state where each attachment portion is inserted into each of the concave streaks, one of the pair of holding plates is provided. , And after replacing only the one of the plurality of cutter bodies where the chipping or the like has occurred, the cutter body can be replaced by a simple operation of attaching one of the holding plates again. As a result, the workability of replacing the cutter body can be further improved.

FIG. 18 is a sectional view taken along line AA of FIG. 17 including the rotary cutter according to the embodiment of the present invention. FIG. 15 is a sectional view taken along line BB of FIG. 14 showing the rotary cutter. FIG. 5 is a view showing the rotary cutter as viewed from an arrow C in FIG. 4. FIG. 4 is a view on arrow D of FIG. 3 showing the rotary cutter. FIG. 7 is a view as seen from an arrow E in FIG. 6 showing the cutter body. FIG. 6 is a view as viewed from the direction of arrow F in FIG. 5 showing the cutter body. FIG. 6 is a view on arrow G of FIG. 5 showing the cutter body. FIG. 7 is a view on arrow H of FIG. 6 showing the cutter body. It is the perspective view seen from the attachment part side which shows a cutter main body. It is the perspective view which looked at the cutter main body from the cutting blade part side. It is a front view of the 1st holding piece of a cutter holding member. It is a front view of the 2nd holding piece of a cutter holding member. It is a front view of a cutter holding member. FIG. 2 is a sectional view taken along line II of FIG. 1. It is a perspective view of the rotary cutter which shows the state which removed the 2nd holding piece. It is a perspective view of the rotary cutter which shows the state to which the 2nd holding piece was attached. It is a front view of the bark removing machine to which the rotary cutter was attached.

  Next, an embodiment for carrying out the present invention will be described with reference to the drawings. As shown in FIG. 17, the rotary cutter 11 is rotatably mounted via a rotary shaft 14 to a distal end of an arm 13 of a bark removing machine 12. The bark removing machine 12 is also called a ring barker or a rotary barker, and includes a machine 16, a machine frame 17 and an electric motor 18 mounted on the machine 16 at predetermined intervals. A ring frame 19 is rotatably mounted on the machine frame 17, and a belt 21 is stretched between the ring frame 19 and a drive shaft 18a of the electric motor 18. Then, the ring frame 19 is driven to rotate by the electric motor 18. In addition, three arms 13 are attached to the front of the ring frame 19 so as to be able to swing around the support shaft 22, and the base ends of three air cylinders 23 are attached to be able to swing. The proximal end of the arm 13 is connected to the distal end of the piston rod 23 a of the air cylinder 23, and the rotary cutter 11 is rotatably attached to the distal end of the arm 13 via the rotary shaft 14. By supplying and discharging compressed air to and from each air cylinder 23, each rotary cutter 11 is urged to gather at the center of the ring frame 19, so that the bark of wood (raw wood) can be peeled off at each rotary cutter 11. A large pressing force is generated.

  The base of the rotary shaft 14 is rotatably attached to the tip of the arm 13 via a pair of bearings 24 and 26 (FIG. 17). Further, a spline shaft 14a is provided at the tip of the rotary shaft 14, and a male thread 14b is provided at the tip of the spline shaft 14a (FIG. 1). The spline hole 11a of the rotary cutter 11 is fitted into the spline shaft portion 14a, and the lock nut 27 is screwed into the male screw portion 14b, whereby the rotary cutter 11 is configured to rotate together with the rotary shaft 14. Reference numerals 14c and 14c in FIG. 17 denote two rows of driven sprockets that are fitted between the pair of bearings 24 and 26 of the rotary shaft 14, that is, are fitted and then fixed by welding. Roller chains (not shown) are respectively mounted on these driven sprockets 14c, 14c. These roller chains are passed through the inside of the arm 13 and are mounted on two rows of drive sprockets (not shown), and furthermore, these drive chains are driven. The sprocket is connected to a rotation drive mechanism (not shown).

  On the other hand, the rotary cutter 11 is attached to a cylindrical cutter holding member 31 that is spline-fitted to the rotary shaft 14, and is detachably attached to an outer peripheral portion of the cutter holding member 31 at a predetermined circumferential interval. A plurality of cutter bodies 32 are provided (FIG. 1). The cutter holding member 31 is formed by using a metal plate having a predetermined thickness and stacking a plurality of holding member pieces 31a formed in the same shape and the same disk shape having a first spline hole 31b at the center. Is formed into a cylindrical shape. However, the two holding member pieces 31a, 31a located at both ends of the plurality of holding member pieces 31a become part of the first and second concave concave surfaces 31c, 31c and part of the slopes 38, 39, respectively. The inclined surfaces 31d are formed respectively (FIGS. 2, 13 and 14).

  Further, on the outer peripheral surface of each holding member piece 31a, a plurality of concave grooves 31e formed at predetermined intervals in the circumferential direction, and between the adjacent concave grooves 31e, toward the first spline hole 31b. A plurality of the above-mentioned first curved concave surfaces 31c that are recessed are formed (FIGS. 13 and 14). The cutter holding member 31 formed by laminating the plurality of holding member pieces 31a has a predetermined interval in the circumferential direction on the outer peripheral surface and extends in the axial direction of the rotary shaft 14 by connecting the concave grooves 31e. (FIG. 1 and FIG. 14 to FIG. 16). These concave stripes 31f are formed to extend from the outer peripheral surface of the cutter holding member 31 substantially toward the center (a position shifted by a predetermined distance from the center), and have an outermost width along the longitudinal direction of the concave stripe 31f. A wide first concave strip 31g is formed, a wide second concave strip 31h is formed on the innermost side, and a narrow third concave strip 31i is formed between the first concave strip 31g and the second concave strip 31h. (FIG. 14). Specifically, the first groove 31g and the second groove 31h are formed to have the same width, and the third groove 31i is formed to be narrower than the first groove 31g and the second groove 31h. The second concave strip 31h is formed in a flat rectangular shape, and a T-shaped concave strip is formed by the second concave strip 31h and the third concave strip 31i. Furthermore, four through holes 31j are formed in the cutter holding member 31 at equal intervals in the circumferential direction around the first spline hole 31b. The surface hardness of the cutter holding member 31 is set smaller than the surface hardness of the rotary shaft 14. Specifically, the surface hardness of the cutter holding member 31 is preferably set to HRC28 to HRC32, more preferably HRC30, and the surface hardness of the rotary shaft 14 is preferably set to HRC40 to HRC44, more preferably HRC42. . This is because the rotary shaft 14 is not worn and the rotary cutter 11 is worn, so that the rotary shaft 14 incorporated inside the bark removing machine 12 is replaced. This is because it is easier to replace the cutter 11.

On the other hand, the cutter body 32 is detachably attached to the outer peripheral portion of the cutter holding member 31 at predetermined intervals in the circumferential direction (FIGS. 1, 3, and 14 to 16). Each cutter body 32 is formed so as to extend in the axial direction of the rotary shaft 14 and can be inserted into each recess 31f from the axial direction of the rotary shaft 14, and a predetermined angle θ with respect to the longitudinal direction of the mounting portion 32a. Each has a mounting blade 32a and a cutting blade 32b integrally formed in a state of extending in a direction inclined by _one (FIGS. 5 to 10). The mounting portion 32a and the cutting blade portion 32b are integrally formed of an alloy tool steel such as SKD11 or a high-speed tool steel such as SKH3. The mounting portion 32a includes a first convex ridge 32c that can be inserted into the first concave ridge 31f from the axial direction of the rotary shaft 14, and a second convex ridge that can be inserted into the second concave ridge 31h from the axial direction of the rotary shaft 14. 32d and a third convex ridge 32e that can be inserted into the third concave ridge 31i in the axial direction of the rotary shaft 14 (FIGS. 5, 8, 10, and 14). The first ridge 32c and the second ridge 32d are formed to have the same width, and the third ridge 32e is formed to be narrower than the first ridge 32c and the second ridge 32d. The second convex ridge 32d is formed in a flat rectangular shape, and a T-shaped convex ridge is formed by the second convex ridge 32d and the third convex ridge 32e. Further, a relatively large chamfer 32f is formed at one corner of the second convex strip 32d (FIGS. 8, 13 and 14). Thereby, the second concave ridge 31h can be formed in a shape corresponding to the second convex ridge 32d, so that a large thickness between the adjacent second concave ridges 31h can be secured, and the strength of the cutter holding member 31 can be increased. The predetermined angle theta ₁ is preferably 18 degrees to 22 degrees, is more preferably set to 20 degrees (Fig. 6). Discharge Here, was limited to the range of the predetermined angle theta ₁ to 18 degrees to 22 degrees, the bark was peeled off at the cutting edge portion 32b of the cutter body 32 (chips) smoothly below 18 degrees If the angle exceeds 22 degrees, a load is applied to the cutting edge of the cutting blade portion 32b, and the cutting edge is consumed in a short period of time.

  With the mounting portions 32b of the cutter body 32 being inserted into the respective recesses 31f of the cutter holding portion 31, both surfaces of the plurality of mounting portions 32a are sandwiched by a pair of sandwiching plates 33 and 34, thereby forming a plurality of cutters. The main body 32 is attached to the cutter holding member 31 (FIG. 1). Thereby, the cutting blade 32b is provided to protrude radially outward from the outer peripheral surface of the cutter holding member 31 (FIGS. 1, 4, and 14). One of the pair of holding plates 33 and 34 has a large-diameter hole 33a formed at the center and four screws formed at equal intervals in the circumferential direction around the large-diameter hole 33a. It has a hole 33b and a plurality of second curved concave surfaces 33c formed on the outer peripheral surface at equal intervals in the circumferential direction (FIG. 11). The large-diameter hole 33a is loosely fitted into the collar 36 fitted into the spline shaft portion 14a of the rotary shaft 14 (FIG. 1). The other of the pair of holding plates 33, 34 is formed with a second spline hole 34a formed at the center and at equal intervals in the circumferential direction around the second spline hole 34a. It has four through holes 34b and a plurality of third curved concave surfaces 34c formed on the outer peripheral surface at equal intervals in the circumferential direction (FIG. 12). Further, one holding plate 33 is formed thicker than the other holding plate 34.

  When the mounting portions 32a of the cutter body 32 are inserted into the recesses 31f of the cutter holding portion 31 and both surfaces of the plurality of mounting portions 32a are sandwiched by the pair of holding plates 33 and 34, the cutter holding member 31 is removed. The first spline hole 31b communicates with the second spline hole 34a of the other holding plate 34 (FIG. 1), and the through hole 31j of the cutter holding member 31, the screw hole 33b of one holding plate 33, and the other holding plate. The through hole 34b of the plate 34 communicates (FIG. 1), and the first curved concave surface 31c of the cutter holding member 31, the second curved concave surface 33c of the one holding plate 33, and the third curved concave surface 34c of the other holding plate 34 are smooth. (FIG. 2). Then, a bolt 37 (for example, a button cap bolt) is inserted into the through hole 34b and the through hole 31j and screwed into the screw hole 33b, whereby the cutter body 32 and the cutter holding portion 31 are integrated (FIG. 1). . Further, the second curved concave surface 33c is formed to be inclined so as to be continuous with one inclined surface 31d of the first curved concave surface 31c, whereby a clearance gradient 38 is formed from the first curved concave surface 31c to the second curved concave surface 33c, The third curved concave surface 34c is formed to be inclined so as to be continuous with the other inclined surface 31d of the first curved concave surface 31c, whereby a clearance gradient 39 is formed from the first curved concave surface 31c to the third curved concave surface 34c (FIG. 2). Further, the first spline hole 31b and the second spline hole 34a communicate with each other to form a spline hole 11a of the rotary cutter 11, and the spline hole 11a is fitted into the spline shaft portion 14a of the rotary shaft 14. Then, the cutter holding member 31 is spline-fitted to the rotary shaft 14 (FIG. 1).

  A method for manufacturing the rotary cutter 11 configured as described above will be described. First, a plurality of grooves 31e and a plurality of first curved concave surfaces 31c are formed at predetermined intervals in the circumferential direction on the outer peripheral surface by laser cutting a metal plate having a predetermined thickness, and the first curved central surface is formed at the center. A plurality of holding member pieces 31a of the same shape and the same size in which the spline holes 31b are formed are manufactured. Thereby, the holding member piece 31a having good dimensional accuracy can be manufactured. In addition, the thickness of the metal plate is preferably in the range of 8 mm to 10 mm, and more preferably 9 mm. As the metal plate, it is preferable to use a steel plate such as S45C, SK5, or SK7. Here, the reason why the thickness of the metal plate is limited to the range of 8 mm to 10 mm and the material of the metal plate is limited to the steel plate is because the holding member piece 31 a having good dimensional accuracy is manufactured by laser cutting. is there. Further, the two holding member pieces 31a, 31a located at both ends of the plurality of holding member pieces 31a are partially cut away by laser cutting into a part of the first curved concave surface 31c and a part of the slope 38, 39. The inclined surfaces 31d, 31d are formed respectively (FIGS. 2, 13 and 14). Further, in this embodiment, three holding member pieces 31a in which twelve concave grooves 31e and twelve first curved concave surfaces 31c are formed are manufactured. Next, a plurality of holding member pieces 31a are stacked to produce a cutter holding member 31 having a concave stripe 31f formed by a series of concave grooves 31e.

  Next, a plurality of cutter bodies 32 are manufactured by integrally molding a mounting portion 32a that can be inserted into the concave streak 31f of the cutter holding member 31 with the cutting blade portion 32b by a lost wax precision casting method. In the lost wax precision casting method, after a wax molded in a mold is attached to a tree and a ceramic coating is applied, a wax of a wax type is melted to produce a mold, and the molten metal is poured into the mold to obtain a desired shape. This is a method of manufacturing the part. As the metal to be poured into the mold, alloy tool steel such as SKD11 or high-speed tool steel such as SKH3 is preferably used, but a hard or sticky steel type suitable for the dry state of wood (raw wood) is used as the cutter body 32. Material can be selected. Further, the quenching temperature after integrally forming the mounting portion 32a and the cutting blade portion 32b is preferably in the range of 1020 ° C to 1030 ° C, and the quenching hardness is preferably in the range of HRC50 to HRC63. The reason for limiting the quenching hardness to the range of HRC50 to HRC63 is that if the hardness is less than HRC50, the cutter body 32 is worn, and if the hardness exceeds HRC63, the cutter body 32 becomes too hard and breaks. After quenching, in order to increase the toughness of the cutter body 32, it is preferable to perform a heat treatment of tempering twice at a temperature of about 500 ° C. In this embodiment, twelve cutter bodies 32 are manufactured.

  Further, the plurality of cutter bodies 32 are attached to the cutter holding member 31 by sandwiching both surfaces of the plurality of attachment portions 32a with the pair of sandwiching plates 33 and 34 with the respective attachment portions 32a inserted into the respective concave streaks 31f. Here, a bolt 37 (for example, a button cap bolt) is inserted into the through hole 34b of the other holding plate 34 and the through hole 31j of the cutter holding member 31, and screwed into the screw hole 33b of the one holding plate 33. Then, the cutter body 32 and the cutter holding portion 31 are integrated, and the rotary cutter 11 is completed (FIGS. 1, 3, 4, and 16). The pair of holding plates 33 and 34 are preferably manufactured by laser cutting a metal plate (a steel plate such as S45C, SK5, or SK7), similarly to the holding member piece 31a. One of the holding plates 33 of the pair of holding plates 33, 34 has a large-diameter hole 33a formed at the center thereof by laser cutting, and four large-diameter holes 33a are formed around the large-diameter hole 33a at equal intervals in the circumferential direction. A pilot hole is formed, and a plurality of second curved concave surfaces 33c are formed on the outer peripheral surface at equal intervals in the circumferential direction (FIG. 11). The other holding plate 34 of the pair of holding plates 33 and 34 has a second spline hole 34a formed at the center by laser cutting, and is circumferentially equally spaced around the second spline hole 34a. Are formed, and a plurality of third curved concave surfaces 34c are formed on the outer peripheral surface at equal intervals in the circumferential direction (FIG. 12). In addition, four screw holes 33b are respectively formed in the four pilot holes by performing tapping. Further, the second curved concave surface 33c of one of the holding plates 33 is formed by laser cutting so as to be continuous with one inclined surface 31d of the first curved concave surface 31c, thereby forming the second curved concave surface 31c from the first curved concave surface 31c. A clearance gradient 38 is formed over the concave surface 33c (FIG. 2). Further, the third curved concave surface 34c of the other holding plate 34 is formed so as to be inclined so as to be continuous with the other inclined surface 31d of the first curved concave surface 31c, so that the third curved concave surface 31c extends from the first curved concave surface 31c to the third curved concave surface 34c. A clearance gradient 39 is formed.

  A method of using the rotary cutter 11 manufactured as described above will be described. After the spline hole 11a of the rotary cutter 11 is fitted into the spline shaft portion 14a of the rotary shaft 14, the lock nut 27 is screwed into the male screw portion 14b of the rotary shaft 14, so that the rotary cutter 11 is attached to the bark removing machine 12. Can be At this time, since the surface of the other holding plate 34 of the rotary cutter 11 protrudes from the distal end surface of the spline shaft portion 14a of the rotary shaft 14, when the lock nut 27 is screwed into the male screw portion 14b of the rotary shaft 14, The cutter holding member 31 and the cutter main body 32 are pressed against each other with a large force, and the cutter holding member 31 and the cutter main body 32 do not shift and move. Then, when the bark peeling machine 12 is operated and the wood (raw wood) is sent to the center of the ring frame 19 by a transfer device (not shown) while the ring frame 19 and the rotary cutter 11 are rotating, The supply and discharge of compressed air to and from the air cylinder 23 urges the rotary cutters 11 to gather at the center of the ring frame 19. As a result, the bark of the wood (raw wood) is peeled off by the rotary cutter 11.

On the other hand, as shown in FIG. 14, for example, when the outer diameter D ₁ of the rotary cutter 11 is set to 155 mm, the radius of curvature R ₁ of the first curved concave surface 31c of the cutter holding member 31 is formed as large as 8 mm, and the cutting edge the distance d ₁ from the edge parts 32b to the bottom of the first concave curved surface 31c of the cutter holding member 31 is deeply formed with 21 mm. Also, as shown in FIG. 2, in this embodiment, a clearance gradient 38 (for example, θ ₂ = 20 degrees) is formed from the first curved concave surface 31c to the second curved concave surface 33c, and the first curved concave surface 31c A clearance gradient 39 (for example, θ ₂ = 20 degrees) is formed over the three curved concave surfaces 34c. With this configuration, chips in the first to third curved concave surfaces 31c, 33c, 34c are smoothly discharged from both sides of the rotary cutter 11.

  When it is determined that the cutter body 32 of the rotary cutter 11 is chipped or the like due to a change in vibration or noise of the bark removing machine 12, first, the bark removing machine 12 is stopped, and the lock nut 27 is moved to the rotary shaft 14. Remove from the male screw portion 14b, remove the bolt 37 (for example, button cap bolt) from the screw hole 33b of the one holding plate 33, and pull out from the through hole 31j of the cutter holding member 31 and the through hole 34b of the other holding plate 34. . Next, the other holding plate 34 is detached from the rotary shaft 14, and the attachment portion 32 a of the cutter body 32 where the chipping or the like has occurred is pulled out from the concave streak 31 f of the cutter holding member 31, so that the cutter body 32 where the chipping or the like has occurred. Is removed from the cutter holding member 31. Next, after the spare cutter body 32 is attached to the cutter holding member 31 by inserting the mounting portion 32a of the spare cutter body 32 into the concave streak 31f of the cutter holding member 31, the other holding plate 34 is rotated by the rotary shaft. 14. Further, after the bolt 37 (for example, a button cap bolt) is inserted into the through hole 34b and the through hole 31j and screwed into the screw hole 33b, the lock bolt 27 is screwed into the male screw portion 14b of the rotary shaft 14. With such a simple operation, the cutter main body 32 in which chipping or the like has occurred can be replaced with the spare cutter main body 32.

  In the above-described embodiment, three holding member pieces having twelve concave grooves and twelve first curved concave surfaces are formed, and these holding member pieces are laminated to form twelve concave members. Although a single cutter holding member having a strip was formed, and twelve cutter bodies to be inserted into these concave strips were formed, the number of cutter bodies is not limited to these. For example, when peeling a resin such as special wood (rough wood) that generates a lot of chips, three holding member pieces having eight concave grooves and eight first curved concave surfaces are formed, and these are held. A single cutter holding member in which eight concave stripes are formed by stacking the member pieces may be produced, and eight cutter bodies inserted into these concave stripes may be produced. As a result, the distance between the adjacent cutter bodies increases, so that chips are less likely to be clogged. As a result, the load on the cutting edge of the cutter body can be reduced.

  In the above-described embodiment, the second ridge among the ridges of the cutter holding member is formed in a flat rectangular shape, and the second ridge of the mounting portion of the cutter body is formed in a shape corresponding to the second ridge. However, if the second ridge can be formed to be wider than the third ridge, the second ridge is formed in a circular shape, an elliptical shape, a flat polygonal shape, or another shape, and the second ridge of the mounting portion of the cutter body is formed. May be formed in a shape corresponding to the second concave stripe. Further, in the above embodiment, three arms are attached to the bark removing machine, and three rotary cutters are attached to the ends of these arms. However, four or five or more arms are attached to the bark removing machine. , And four or five or more rotary cutters may be attached to the ends of these arms, respectively.

Reference Signs List 11 rotary cutter 12 bark removing machine 13 arm 14 rotary shaft 31 cutter holding member 31a holding member piece 31e concave groove 31f concave streak 32 cutter body 32a mounting portion 32b cutting blade portion 33, 34 clamping plate

Claims (2)

A rotary cutter rotatably mounted via a rotary shaft at a tip of an arm of a bark removing machine,
A cylindrical cutter holding member spline-fitted to the rotary shaft,
A plurality of cutter bodies having cutting edge portions protruding radially outward from the outer peripheral surface of the cutter holding member and detachably attached to the outer peripheral portion of the cutter holding member at predetermined intervals in the circumferential direction. Prepared ,
The cutter holding member has a plurality of recesses formed on the outer peripheral surface, each extending in the axial direction of the rotary shaft at predetermined intervals in the circumferential direction,
Each cutter body is formed so as to extend in the axial direction of the rotary shaft and is capable of being inserted into each of the recesses from the axial direction of the rotary shaft, and is inclined at a predetermined angle with respect to the longitudinal direction of the mounting portion. Having the cutting portion integrally formed with the mounting portion in a state extending in the direction,
The plurality of cutter bodies are attached to the cutter holding portion by clamping both surfaces of the plurality of attaching portions with a pair of holding plates in a state where the respective attaching portions are inserted into the respective concave streaks. A rotary cutter characterized by the following. A step of manufacturing a plurality of holding member pieces of the same shape and size having a plurality of concave grooves formed at predetermined intervals in a circumferential direction on an outer peripheral surface by laser cutting a metal plate having a predetermined thickness; ,
A step of producing a cutter holding member in which the concave grooves are formed in series with the concave grooves by laminating the plurality of holding member pieces,
A step of producing a plurality of cutter bodies by quenching after integrally forming a mounting portion insertable into the concave streak with the cutting blade portion by a lost wax precision casting method,
Attaching the plurality of cutter bodies to the cutter holding member by sandwiching both surfaces of the plurality of attaching portions with a pair of sandwiching plates in a state where each attaching portion is inserted into each of the concave streaks. Production method.

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