JP6186169B2 - Rotary saw and rotary saw mounting structure - Google Patents

Description

  The present invention relates to a rotary saw that attaches to a saw mounting portion of a cutting device and rotates to cut an object to be cut, and a rotary saw mounting structure.

  Conventionally, for example, a disk-shaped rotary saw has been used to remove protrusions such as a feeder and a pouring gate provided in a rough casting immediately after casting (for example, see Patent Document 1). This rotary saw (rotary cutter) is constructed by forming a plurality of blade bases with chips on the outer periphery of a disk-shaped base metal at intervals, and the motor mounted on the tool support base. It is attached to the rotating shaft. Then, while rotating the rotary saw by the operation of the motor, the surface opposite to the position of the motor on both sides of the rotary saw is brought close to the surface of the product part of the rough casting from the side, thereby protruding from the surface of the product part. Unnecessary protrusions such as a feeder and a gate can be cut and removed.

  Such a rotary saw is attached to the rotating shaft of a motor using a bolt. If the head of the bolt protrudes from the surface of the rotary saw, the head of the protruded bolt becomes a workpiece during cutting. There is a risk of contact. For this reason, the thickness is generally increased by projecting the central portion of the surface of the rotary saw on the motor side. A concave portion that can accommodate the head portion of the bolt is provided on the plane side opposite to the motor of the rotary saw so that the head portion of the bolt does not protrude from the surface of the rotary saw. For the purpose of reinforcement, the central portion of the rotary saw may be thickened. However, when manufacturing a rotary saw having a thick central portion, a processing is performed in which a thick disc is prepared and the outer peripheral side portion is cut into a thin wall. This causes a problem that the processing becomes complicated and the cost is increased.

  For this reason, the center part is also thickened by assembling a small-diameter plate in the center of a large-diameter plate having a blade portion formed on the outer periphery. In this case, first of all, a large-diameter saw body in which an insertion hole into which a bolt including the head can be inserted is formed, and a small-diameter auxiliary plate in which an engagement hole in which the screw portion of the bolt can be inserted but the head cannot be inserted is formed. Are fixed with a fixing tool such as a bolt. Then, with the bolt inserted through the insertion hole of the saw body and the head of the bolt engaged with the surface on the saw body side of the auxiliary plate, the threaded portion is inserted into the engagement hole of the auxiliary plate and cut. A rotary saw composed of a saw body and an auxiliary plate is attached to the cutting device by screwing into a screw hole formed in the saw attachment portion of the device.

JP 2010-520 A

  However, when the rotary saw is attached to the cutting device in this manner, the auxiliary plate can be firmly fixed to the cutting device. However, the size of the fixing tool for assembling the saw body and the auxiliary plate is not limited to that of the rotary saw. Since there is a limit due to the thickness relationship, it is difficult to firmly assemble the saw body and the auxiliary plate. For this reason, when a workpiece is cut using such a rotary saw, there arises a problem that the saw body and the auxiliary plate rattle each other during cutting, and a cutting failure is likely to occur.

  The present invention has been made to address the above-described problems, and an object of the present invention is to provide a rotary saw and a rotary saw mounting structure that can be manufactured easily and at a low cost, and can prevent occurrence of cutting defects. That is. In the description of each constituent element of the present invention below, the reference numerals of corresponding portions of the embodiment are shown in parentheses in order to facilitate understanding of the present invention. The present invention should not be construed as being limited to the configurations of the corresponding portions indicated by the reference numerals of the forms.

In order to achieve the above-mentioned object, the structural feature of the rotary saw according to the present invention is that the workpiece is cut by being attached to the saw mounting portion (18, 28, 38) of the cutting device and rotating. It is a saw (10, 20), is formed in a disk shape, is provided with blade portions (12, 22) on its outer periphery, and the opening on one surface is larger in diameter than the opening on the other surface at the center side. A plurality of body-side connecting holes (13, 23, 33) and a plurality of screw holes (14a, 24a) are formed in a plate shape with a saw body (11, 21, 31) provided with a space therebetween. the outer peripheral side thereof to a plurality of the plurality of auxiliary plate side connection holes at the same interval as the body-side connecting hole (15b, 25b, 35b) are provided Rutotomoni, the opening of the one surface and the other at the same interval as a plurality of screw holes Te A plurality of fixing holes (15d, 25d) having a smaller diameter than the opening of the surface of Vignetting, auxiliary plate (15 installed a plurality of auxiliary plate-side connection hole Rutotomoni fit into a plurality of body side connection hole, the other surface of the saw body to fit a plurality of fixing holes in a plurality of screw holes, 25, 35) and an outer peripheral side engaging portion (16b, 26b) which is formed in a cylindrical shape and can be engaged with the inner peripheral portion (13a) of the main body side connecting hole on one of the outer peripheral portions, An inner peripheral side engaging portion (16c, 26c, 36c) that protrudes toward the inner peripheral side is provided on the other of the inner peripheral portions, and the outer peripheral side engaging portion is engaged with the inner peripheral portion of the main body side connecting hole. A plurality of pressing members (16, 26, 36) inserted from the main body side connection holes toward the auxiliary plate side connection holes and a plurality of pressing members inserted from the plurality of fixing holes and screwed into the plurality of screw holes, respectively. and a dish bolt (17, 27), to position the auxiliary plate side of the pressing member and the countersunk bolt In that each end portion is prevented from protruding to the outside from the auxiliary plate.

  The rotary saw according to the present invention is composed of a saw body provided with a blade on the outer periphery, an auxiliary plate, and a pressing member, and an opening on one surface is provided on the other side of the center side of the saw body. A plurality of main body side connection holes having a diameter larger than the opening of the main plate are provided at intervals, and a plurality of auxiliary plate side connection holes are provided on the outer peripheral side of the auxiliary plate at the same intervals as the plurality of main body side connection holes. ing. That is, the size of the auxiliary plate is the same size as the central side portion of the saw body. Further, the pressing member is provided with an outer peripheral side engaging portion that can be engaged with the main body side connecting hole of the saw body on one end of the outer peripheral portion, that is, on one end side corresponding to one surface of the saw main body. On the other hand, that is, it is formed in a cylindrical shape with an inner peripheral engagement portion provided on the end side corresponding to the auxiliary plate, and is inserted into the main body side connection hole with the axial direction aligned, and the outer peripheral engagement portion is inserted into the main body By engaging with the inner peripheral portion of the side connecting hole, it can be assembled to the saw body.

  According to the present invention, the saw body can be formed by providing a plurality of body-side connecting holes in a disc having a constant thickness with a blade on the outer periphery, and the auxiliary plate has a predetermined shape smaller than the saw body. It can be formed by providing a plurality of auxiliary plate side connection holes in the plate. Then, by aligning the plurality of auxiliary plate side connecting holes with the small diameter side of the plurality of main body side connecting holes and installing the auxiliary plate on the other surface of the saw body, the outer peripheral side portion is thin and the central side portion is thick It can be made into the shape of a rotating saw. For this reason, a troublesome process of cutting a thick disk and thinning the outer peripheral side portion is not necessary, facilitating the manufacturing and reducing the cost.

  Further, since the pressing member is formed in a cylindrical shape, for example, a bolt composed of a head portion and a screw portion can be passed therethrough, and at that time, the head portion of the bolt is inserted into the inner peripheral side engaging portion. Can be engaged. For this reason, a pressing member is inserted from the main body side connection hole of the saw body toward the auxiliary plate side connection hole of the auxiliary plate to engage the outer peripheral side engagement portion with the inner peripheral portion of the main body side connection hole. By inserting the bolt through the inside of the pressing member and engaging the head of the bolt with the inner peripheral engagement portion, the screw portion of the bolt is fixed to the saw mounting portion of the cutting device by screwing, thereby assisting with the saw body. The plate can be integrated with the saw mounting portion. In this case, the saw body is attached to the saw attachment part via the pressing member and the bolt, and the auxiliary plate is interposed between the saw body and the saw attachment part. For this reason, the rotational force of the saw mounting portion is mainly transmitted to the saw body. When the saw body rotates during the cutting process, the auxiliary plate also rotates integrally with the saw body. As a result, it is difficult for the saw body and the auxiliary plate to rattle and cause poor cutting.

  In addition, although the number and arrangement | positioning of a some main body side connection hole can be set arbitrarily, it is preferable to provide 3-6 pieces at fixed intervals along the circumference of the virtual circle concentric with a saw main body. The shape of the auxiliary plate is preferably circular, but may be a triangle, a quadrangle, or a polygon that is a pentagon or more. And the number and arrangement of the plurality of auxiliary plate side connection holes are also provided corresponding to the plurality of main body side connection holes, and provided at regular intervals along the circumference of a virtual circle centered on the center of the auxiliary plate. Is preferred. Further, it is preferable that the other end of the pressing member does not protrude to the outside of the auxiliary plate side connecting hole. In this case, the other end of the pressing member may be located in the auxiliary plate side connecting hole. It may be located in the main body side connecting hole.

According to the present invention, the tip of the pressing member inserted from the main body side connection hole is positioned in the auxiliary plate side connection hole. For this reason, if the saw mounting surface of the saw mounting portion is flat when the rotary saw is fixed to the saw mounting portion of the cutting device using a rod-shaped fixing member such as a bolt, the pressing member is The saw body is pressed to the saw mounting portion side through the rod-shaped fixing member without being pressed against the saw body and directly pressed against the auxiliary plate or the saw mounting portion side. At this time, since the tip of the pressing member does not contact the saw mounting portion, the auxiliary plate can be firmly sandwiched between the saw body and the saw mounting portion. For this reason, the auxiliary plate and the saw body can rotate together with the saw mounting portion without rattling. As a result, smooth cutting can be performed. Moreover, it is preferable that the pressing member can be inserted into the auxiliary plate side connection hole without resistance.

In the present invention, it is preferable that the end portion of the pressing member located on the saw body side does not protrude outward from one surface of the saw body. One surface of the saw body is the surface opposite to the surface on which the auxiliary plate is installed, and the cutting process performed using the rotary saw cuts and removes the unnecessary portion protruding from the product portion of the rough casting. For example, it is a surface facing the product portion. According to this, it can prevent that the edge part located in the saw main body side of a pressing member protrudes outside, and becomes obstructive of a cutting process. Even if the part that cuts the workpiece directly is the outer peripheral part of the rotary saw, if the workpiece has a protruding part, the protruding part may come into contact with the central part of one surface of the rotary saw. is there. For this reason, by preventing the one end of the pressing member from projecting to the outside from one surface of the saw body, a favorable cutting process can be performed regardless of the shape of the workpiece.

Another structural feature of the rotary saw according to the present invention is that the main body side connecting hole (13) is formed of a stepped hole with one side having a large diameter and the other side having a small diameter, and the outer periphery of the pressing member (16). The side engaging portion (16b) is constituted by a flange-like protrusion having a flat surface that can be engaged with the step portion of the main body side connecting hole.

According to the present invention, since the engagement between the inner peripheral portion of the main body side connecting hole and the outer peripheral side engaging portion of the pressing member is the engagement between the stepped portion and the flange-like protruding portion, more reliable engagement is possible. become.

Still another structural feature of the rotary saw according to the present invention is that the main body side connecting hole (23) is formed of a tapered hole having a gradually decreasing diameter from one side to the other, and the pressing member (26). The outer peripheral side engaging portion (26b) is formed of a flange-like protrusion having a tapered surface that can be engaged with the tapered surface of the main body side connecting hole.

According to the present invention, even when the thickness of the saw body is thin, the engagement between the inner peripheral part of the main body side connecting hole and the outer peripheral side engaging part of the pressing member can be further ensured. That is, when a step is provided in the inner peripheral portion of the main body side connection hole of the thin saw body, the strength is weakened, and when the outer peripheral side engaging portion of the pressing member is engaged with the step portion. There is a risk that the stepped portion is damaged. On the other hand, in the present invention, since the pressing force from the pressing member is received over substantially the entire inner peripheral surface of the main body side connecting hole, sufficient strength can be secured. The taper portion of the main body side connection hole may be formed on the entire inner peripheral surface of the main body side connection hole or may be formed on a part thereof. And the taper part of an outer peripheral side engaging part is formed corresponding to the taper part of a main body side connection hole.

  Further, the structural feature of the rotary saw mounting structure according to the present invention is the rotary saw mounting structure in which each rotary saw described above is mounted on the saw mounting portion of the cutting device, and is opposed to the auxiliary plate in the saw mounting portion. A plurality of screw holes (18c, 28c, 38c) are provided on the saw mounting surface at the same intervals as the plurality of main body side connecting holes, and the plurality of bolts (19, 29) are connected to the main body via the plurality of pressing members. A plurality of bolt heads (19b, 29b) are respectively engaged with the inner peripheral side engaging portions and the auxiliary plate is pressed against the saw mounting portion by the saw body through the side connecting holes and the auxiliary plate side connecting holes. In this state, a plurality of bolts are screwed into a plurality of screw holes.

  In the rotary saw mounting structure according to the present invention, a rotary saw composed of a saw body, an auxiliary plate, and a pressing member is mounted to the saw mounting portion with a plurality of bolts. In this case, first, a pressing member is inserted from the main body side connecting hole of the saw body toward the auxiliary plate side connecting hole of the auxiliary plate, and the outer peripheral side engaging portion is engaged with the inner peripheral portion of the main body side connecting hole. Yes. Then, by passing the bolt through the inside of the pressing member and engaging the bolt head portion with the inner peripheral engagement portion, the screw portion of the bolt is screwed into the screw hole of the saw attachment portion, thereby assisting the saw body. The plate is integrated with the saw mounting part. According to this, the saw body is attached to the saw attachment part via the pressing member and the bolt, and the auxiliary plate is interposed between the saw body and the saw attachment part. For this reason, the rotational force of the saw mounting portion is mainly transmitted to the saw body, and when the saw mounting portion is rotated by the operation of the cutting device, the saw body and the auxiliary plate rotate together. For this reason, it is unlikely that the saw body will rattle and cause a cutting failure.

  In the present invention, when the saw mounting surface of the saw mounting portion is flat, it is necessary to prevent the other end of the pressing member from protruding outside the auxiliary plate. In the case where a concave portion or the like is provided in a portion of the surface facing the pressing member, the other end of the pressing member may protrude outside the auxiliary plate according to the depth of the concave portion or the like. In short, when the saw body and the auxiliary plate are pressed and attached to the saw mounting portion by the pressing force of the bolt, the pressing member may not interfere with the pressing.

  In the present invention, a central shaft protruding from the saw mounting surface is formed at the center of the saw mounting surface facing the auxiliary plate in the saw mounting portion, and a mounting hole through which the central shaft can be inserted is formed at the center of the saw body. It is preferable that a central axis insertion hole through which the central axis can be inserted is formed in the center of the auxiliary plate. According to this, since the center part of the saw body is supported by the central axis of the saw attachment part, the installation positions of the saw body and the auxiliary plate with respect to the saw attachment part become accurate. Thereby, the rotary saw can rotate in a stable state. In addition, the central shaft may be inserted in a tightly fitted state with respect to the mounting hole or may be inserted in a loosely fitted state, but with a margin for the central shaft inserting hole. It is preferable to allow insertion.

  Furthermore, in the present invention, a drive pin protruding from the saw mounting surface is formed on the outer peripheral side of the saw mounting surface facing the auxiliary plate in the saw mounting portion, and a drive hole through which the drive pin can be inserted is formed in the center side of the saw body. Preferably, a pin insertion hole through which the drive pin can be inserted is formed on the outer peripheral side of the auxiliary plate. According to this, since the drive pin is inserted through the drive hole of the saw body and the pin insertion hole of the auxiliary plate, the rotational force of the saw mounting portion is transmitted to the rotary saw by the drive pin. For this reason, the rotational force of the saw mounting portion applied to the bolt and the pressing member is reduced, and the bolt and the pressing member are provided with a strength capable of mainly fixing the saw body and the auxiliary plate to the saw mounting portion. It will be better. Further, it is possible to prevent the bolt and the pressing member from being damaged by applying an excessive force. In addition, although the rotational force by a drive pin may be applied to both a saw main body and an auxiliary | assistant board, it is preferable to apply only to a saw main body.

The rotary saw which concerns on 1st Embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing. It is sectional drawing to which the principal part of FIG.1 (b) was expanded. The pressing member with which the rotary saw of 1st Embodiment is equipped is shown, (a) is a top view, (b) is sectional drawing. It is sectional drawing which showed the attachment structure which attached the rotary saw of 1st Embodiment to the saw attachment part. The rotary saw which concerns on 2nd Embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing. The pressing member with which the rotary saw of 2nd Embodiment is equipped is shown, (a) is a top view, (b) is sectional drawing. It is sectional drawing which showed the attachment structure which attached the rotary saw of 2nd Embodiment to the saw attachment part. It is sectional drawing which showed the principal part of the attachment structure of the rotary saw which concerns on a modification.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIGS. 1A, 1B, and 2 show a rotary saw 10 according to this embodiment. The rotary saw 10 includes a saw body 11, an auxiliary plate 15, and four pressing members 16. FIG. And four countersunk bolts 17. The rotary saw 10 is assembled to a saw mounting portion 18 (see FIG. 4) of a cutting device (not shown), and is rotated by the operation of the cutting device to mainly cut and remove unnecessary projections of the rough casting. In general, it is used by horizontally arranging the surface shown in FIG. 1A upward. For this reason, in the following description, it is assumed that the vertical direction of the rotary saw 10 is based on the state shown in FIG.

  The saw body 11 is configured by forming a blade portion 12 on the outer peripheral portion of a disk-shaped base metal 11a, and a mounting hole 11b is formed at the center of the base metal 11a. Then, four main body side connecting holes 13, two drive holes 14, and four screw holes 14a are formed around the mounting hole 11b. The saw body 11 is made of a steel plate material made of any one of JIS standard SK-5, SKS-5, SCM440, SCM435, etc., and has a diameter (outside of the blade 12 when the rotary saw 10 rotates). The diameter of the peripheral edge portion) is 460 mm, and the thickness is set to 7 mm. The diameter of the mounting hole 11b is set to 50.8 mm.

  The blade portion 12 is composed of a plurality of cutting blades 12c including a blade base 12a and chips 12b formed at a constant pitch on the outer peripheral portion of the base metal 11a. The blade base 12a is composed of a protrusion protruding outward from the outer periphery of the base 11a. And the edge part located in the front side of the rotation direction (counterclockwise direction in the state of Fig.1 (a)) of the rotary saw 10 in the blade base 12a extends in a substantially radial direction, and the back of the rotation direction in the blade base 12a. The edge located on the side extends linearly rearward and slightly to the inner periphery, and then smoothly curves so as to form a recess, and continues to the edge located on the front side of the next blade base 12a. Further, a stepped recess is formed in the outer peripheral side portion of the edge on the front side in the rotational direction of the blade base 12a, and the chip 12b is fixed to the stepped recess.

  The tip 12b is made of PCD (diamond sintered body), and is made of a small, substantially rectangular member having a size that can be installed in the stepped recess of the blade base 12a. The tip 12b has a width (length in the vertical direction) of 9 mm, and in a state where it is fixed to the stepped recess of the blade base 12a, the upper and lower side portions are slightly slightly from both sides in the width direction of the blade base 12a. It protrudes. Moreover, the outer peripheral side edge part of the chip | tip 12b protrudes on the outer peripheral side a little rather than the outer peripheral side edge part of the blade base 12a. The tip 12b is fixed to the stepped recess of each blade base 12a by brazing. Thirty cutting blades 12c formed in this way are formed at a constant pitch on the outer periphery of the base metal 11a, and the cutting blade 12c is constituted by the thirty cutting blades 12c.

  Four main body side connection holes 13 are provided at intervals of 90 degrees around the axis so that the center is located on the circumference when a virtual circle a having a diameter of 165 mm is concentric with the saw main body 11. Yes. The upper portion of the main body side connecting hole 13 has a larger diameter than the lower portion, and a step portion 13a is formed between the upper portion and the lower portion. The upper part of the main body side connecting hole 13 has a diameter of 34 mm and the vertical length is set to 3.5 mm, and the lower part of the main body side connecting hole 13 has a diameter of 26 mm and the vertical length is set to 3.5 mm. Has been.

  The drive hole 14 is provided so that the center is located on the circumference of the imaginary circle a described above, similarly to the main body side connecting hole 13, and two predetermined main body sides are provided at intervals of 180 degrees around the axis. They are arranged in the vicinity of the connecting hole 13. The diameter of the drive hole 14 is set to 12.5 mm. Further, the screw hole 14a is also provided so that the center is located on the circumference of the virtual circle a, and each screw hole 14a is disposed so as to be located between the two main body side connecting holes 13. Yes. The screw hole 14a is formed in a size that allows M8 bolts to be screwed together.

  The auxiliary plate 15 has a central shaft insertion hole 15a formed at the center of the disk, and further includes four auxiliary plate side connection holes 15b and two pin insertion holes 15c around the central shaft insertion hole 15a (see FIG. 4). And four fixing holes 15d. The auxiliary plate 15 is made of the same steel plate material as that of the saw body 11, and has a diameter of 200 mm and a thickness of 8.5 mm. The diameter of the central shaft insertion hole 15a is set to 51.8 mm, which is slightly longer than the diameter of the mounting hole 11b. The four auxiliary plate side connection holes 15b are arranged on the outer peripheral side of the auxiliary plate 15 at the same interval as the four main body side connection holes 13 of the saw body 11, and the diameter thereof is set to 27 mm.

  The two pin insertion holes 15c are arranged on the outer peripheral side of the auxiliary plate 15 in the vicinity of two predetermined auxiliary plate side connection holes 15b at the same interval as the two drive holes 14 of the saw body 11. The diameter of this pin insertion hole 15c is set to 13.5 mm. Further, the four fixing holes 15d are arranged on the outer peripheral side of the auxiliary plate 15 so as to be positioned in the middle of the two auxiliary plate side connecting holes 15b with the same spacing as the four screw holes 14a of the saw body 11. Has been. The fixing hole 15d is configured by a straight hole through which the threaded portion of the M8 bolt can be inserted, and a tapered hole whose diameter increases from the upper part toward the lower part.

  The auxiliary plate 15 configured as described above is assembled to the lower surface of the saw body 11 with the central shaft insertion hole 15a aligned with the mounting hole 11b and the upper portion of the fixing hole 15d aligned with the screw hole 14a. As a result, the main body side connecting hole 13 and the auxiliary plate side connecting hole 15b communicate coaxially, and the drive hole 14 and the pin insertion hole 15c communicate coaxially. In this state, the auxiliary plate 15 can be fixed to the saw body 11 by passing the countersunk bolt 17 from below from the screw portion 17a through the fixing hole 15d and screwing the screw portion 17a into the screw hole 14a. The flat head bolt 17 is composed of an M8 bolt composed of a screw portion 17a and a head portion 17b. The head portion 17b has a larger diameter as it goes downward from the lower end (the lower end in the state of FIG. 2) of the screw portion 17a. It is formed in a truncated cone shape. When the auxiliary plate 15 is fixed to the saw body 11, the head portion 17b is accommodated in the lower portion of the fixing hole 15d, and the upper end portion of the screw portion 17a is located in the screw hole 14a. No part protrudes outside.

  As shown in FIGS. 3A and 3B, the pressing member 16 includes a cylindrical portion 16a whose axial direction is directed upward and downward, and an outward flange-shaped outer periphery formed at the upper end of the outer peripheral surface of the cylindrical portion 16a. The side engaging portion 16b and the inwardly flanged inner peripheral side engaging portion 16c formed at the lower end of the inner peripheral surface of the cylindrical portion 16a. The cylindrical portion 16a has an outer diameter of 25 mm and an inner diameter of 17 mm, and the outer peripheral side engaging portion 16b has an outer diameter of 33 mm and a thickness of 3 mm. The inner peripheral side engaging portion 16c has an inner diameter of 11 mm and a thickness of 3.5 mm. Further, the boundary portion between the outer peripheral surface of the cylindrical portion 16a and the lower surface of the outer peripheral side engaging portion 16b, the boundary portion between the inner peripheral surface of the cylindrical portion 16a and the upper surface of the inner peripheral side engaging portion 16c, and the outer peripheral side engaging portion 16b. In each boundary portion between the outer peripheral surface and the lower surface, 0.5 mm of R is formed.

  The pressing member 16 is inserted into the main body side connecting hole 13 and the auxiliary plate side connecting hole 15b from above the saw body 11 with the inner peripheral side engaging portion 16c facing downward, as shown in FIG. In this way, the saw body 11 and the auxiliary plate 15 are assembled to form the rotary saw 10. In this state, the outer peripheral side engaging portion 16b is engaged with the step portion 13a of the main body side connecting hole 13, and the upper surface of the outer peripheral side engaging portion 16b is at a position lower than the upper surface of the saw body 11, The lower surface of the side engaging portion 16 c is higher than the lower surface of the auxiliary plate 15.

  Further, as shown in FIG. 4, the saw attachment portion 18 is configured by a shaft portion having a diameter substantially the same as the diameter of the auxiliary plate 15, and a portion facing the central shaft insertion hole 15 a at the center of the upper surface thereof A central shaft 18a that protrudes upward is provided, and a drive pin 18b that protrudes upward is provided at a portion of the upper surface of the saw mounting portion 18 that faces the two pin insertion holes 15c. The central shaft 18a is formed with a thickness that can be fitted into the mounting hole 11b, and the drive pin 18b is formed with a thickness that can be fitted into the drive hole 14. Then, screw holes 18c into which M10 bolts can be screwed are formed in portions facing the four pressing members 16 on the upper surface of the saw mounting portion 18.

  The rotary saw 10 inserts the center shaft 18a through the center shaft insertion hole 15a and fits the upper end portion thereof into the mounting hole 11b, and inserts the drive pin 18b into the pin insertion hole 15c and connects the upper end portion thereof to the drive hole 14. Is assembled to the upper surface of the saw mounting portion 18. At this time, the upper end portion of the central shaft 18 a slightly protrudes from the upper surface of the saw body 11, and the upper end portion of the drive pin 18 b is positioned slightly below the upper surface of the saw body 11.

  In this state, the rotary saw 10 can be fixed to the saw mounting portion 18 by passing the hexagon socket head bolt 19 from above the screw portion 19a through the pressing member 16 and screwing the screw portion 19a into the screw hole 18c. . The hexagon socket head cap bolt 19 is composed of an M10 bolt including a threaded portion 19a and a head portion 19b. A hexagonal hole 19c having a hexagonal shape in plan view is formed at the center of the upper surface of the head portion 19b. When the rotary saw 10 is fixed to the saw mounting portion 18, the head portion 19b is accommodated inside the pressing member 16 and does not protrude outside. The saw mounting portion 18 is connected to a main body of a cutting device provided with a motor, and rotates by the operation of the motor. Furthermore, the cutting device is also provided with a moving mechanism, whereby the saw mounting portion 18 can move in the vertical and forward / backward / left / right directions.

  Next, a method for cutting and removing unnecessary protrusions such as a feeder and a gate from a rough casting of an aluminum alloy cylinder head, for example, using the rotary saw 10 attached to the cutting device as described above will be described. . In this case, first, the workpiece support base is installed with the workpiece installation surface facing downward on the side side of the cutting device, and the rough casting is directed downward with the unnecessary projections to be cut and removed. To fix. Next, after the rotary saw 10 is moved so that the upper surface of the rotary saw 10 is located slightly below the height of the lower surface of the cylinder head, which is a product portion of the rough cast, at the side of the coarse casting, the rotary saw is moved. While rotating 10, close to the rough casting. And when the blade part 12 of the rotary saw 10 contacts an unnecessary protrusion, the unnecessary protrusion is cut and removed from the cylinder head.

  In this case, since there is no projecting portion other than the central shaft 18a located at the center on the upper surface of the rotary saw 10, there is no obstacle to the cutting process due to contact with the rough casting. For this reason, smooth cutting becomes possible. The saw body 11 and the auxiliary plate 15 are fixed by a countersunk bolt 17, and the rotary saw 10 is fixed to the saw mounting part 18 by a hexagon socket head bolt 19. And since the rotational force of the saw attachment part 18 by the action | operation of a cutting device is transmitted to the saw main body 11 via the drive pin 18b, the pressing member 16, and the hexagon socket head bolt 19, the hexagon socket head bolt 19 loosens and a rotary saw. It is less likely that 10 is rattled or the countersunk bolt 17 is loose and the saw body 11 and the auxiliary plate 15 are rattled. For this reason, cutting defects do not occur.

  As described above, in the rotary saw 10 according to this embodiment, the saw body 11 and the auxiliary plate 15 which are separately provided are assembled, so that the outer peripheral portion is thin and the central portion is thick. For this reason, when manufacturing the rotary saw 10, troublesome processing such as cutting a thick disk and thinning the outer peripheral side portion becomes unnecessary, which facilitates manufacture and enables cost reduction. . Further, the pressing member 16 presses the saw body 11 and the auxiliary plate 15 integrally assembled by the countersunk bolt 17 against the saw mounting portion 18 through the tightening force of the hexagon socket head bolt 19. Since the pressing member 16 does not contact the saw mounting portion 18, not only the saw body 11 but also the auxiliary plate 15 can be reliably pressed against the saw mounting portion 18. For this reason, when the rough casting is cut, it is unlikely that the saw body 11 or the auxiliary plate 15 will rattle and cause a cutting failure.

  Further, the main body side connecting hole 13 is provided with a stepped portion 13a between the large diameter of the upper portion and the lower portion of the connecting hole 13, and an outer peripheral side engagement with the upper portion of the outer periphery of the pressing member 16 that can be engaged with the stepped portion 13a. While providing the joint part 16b, the inner peripheral side engaging part 16c which can engage the head 19b of the hexagon socket head bolt 19 is provided in the inner peripheral lower part of the member 16 for a press. For this reason, when the rotary saw 10 is fixed to the saw mounting portion 18 with the hexagon socket head cap bolt 19, the outer peripheral side engaging portion 16b of the pressing member 16 is engaged with the step portion 13a of the main body side connecting hole 13, and the pressing is performed. By engaging the head portion 19b of the hexagon socket head bolt 19 with the inner peripheral side engaging portion 16c of the member 16 for use, the saw body 11 and the auxiliary plate 15 can be more reliably fixed.

  Furthermore, by using the pressing member 16, the head portion 19 b of the hexagon socket head bolt 19 can be positioned to the inside of the auxiliary plate 15, and thereby the head portion of the pressing member 16 and hexagon socket head bolt 19. 19 b does not protrude upward from the upper surface of the saw body 11. For this reason, the pressing member 16 and the hexagon socket head bolt 19 do not interfere with the cutting process. Further, since the central shaft 18a of the saw mounting portion 18 is fitted in the mounting hole 11b of the saw body 11, the rotary saw 10 can rotate in a stable state. Further, since the rotational force of the saw mounting portion 18 due to the operation of the cutting device is transmitted to the rotary saw 10 via the drive pin 18b, the pressing member 16, and the hexagon socket head bolt 19, the pressing member 16 and the hexagon socket The accessory bolt 19 may be provided mainly for fixing the saw body 11 and the auxiliary plate 15 to the saw mounting portion 18, and does not need to be configured with a particularly high strength.

(Second Embodiment)
FIGS. 5A and 5B show a rotary saw 20 according to the second embodiment of the present invention. The rotary saw 20 includes a saw body 21, an auxiliary plate 25, four pressing members 26, and four countersunk bolts 27. The saw body 21 is configured by forming a blade portion 22 on the outer peripheral portion of a disk-shaped base metal 21a, and a mounting hole 21b is formed at the center of the base metal 21a. Then, four main body side connecting holes 23, two drive holes 24, and four screw holes 24a are formed around the mounting hole 21b. The thickness of the saw body 21 is set to 3 mm.

  The blade portion 22 is composed of a plurality of cutting blades 22c including a blade base 22a and a tip 22b formed at a constant pitch on the outer peripheral portion of the base metal 21a, and the width of the tip 22b is set to 5 mm. ing. The main body side connecting hole 23 is configured by a tapered surface whose inner peripheral surface gradually decreases in diameter from the upper end to the lower end, and the upper end has a diameter of 32 mm and the lower end has a diameter of 20 mm. Further, the angle of both edges in the cross section of the central portion of the main body side connecting hole 23 is set to 120 degrees. The configuration and dimensions of the other parts of the saw body 21 are the same as those of the saw body 11 described above.

  The auxiliary plate 25 has a central shaft insertion hole 25a formed at the center of the disk, and further, four auxiliary plate side connection holes 25b, two pin insertion holes 25c, and four fixed portions around the central shaft insertion hole 25a. 25 d for holes are formed and comprised. The diameter of the auxiliary plate side connecting hole 25b is set to 23 mm, and the configuration and dimensions of the other portions of the auxiliary plate 25 are the same as those of the auxiliary plate 15 described above. The auxiliary plate 25 configured as described above is fixed to the saw body 11 by a countersunk bolt 27. The countersunk bolt 27 has the same thickness as the countersunk bolt 17 described above, and the length of the threaded portion 27a is a countersunk bolt. It is 4 mm shorter than the 17 screw portions 17a. Thus, the upper end portion of the screw portion 27a is located in the screw hole 24a.

  As shown in FIGS. 6A and 6B, the pressing member 26 includes a cylindrical portion 26a whose axial direction is directed up and down, and an outward flange-shaped outer periphery formed at the upper end of the outer peripheral surface of the cylindrical portion 26a. The side engaging portion 26b and an inwardly flanged inner peripheral side engaging portion 26c formed at the lower end of the inner peripheral surface of the cylindrical portion 26a. The cylindrical portion 26a has an outer diameter of 20 mm and an inner diameter of 14 mm, and the outer peripheral side engaging portion 26b is configured by a tapered surface whose upper surface is flat and whose lower surface decreases from the top to the bottom. The diameter is 32 mm, the thickness is 3 mm on the inner peripheral side, and the thickness gradually decreases toward the outer peripheral side. The inner peripheral side engaging portion 26c has an inner diameter of 6 mm and a thickness of 2 mm. Further, a boundary portion between the outer peripheral surface of the cylindrical portion 26a and the lower surface of the outer peripheral side engaging portion 26b, and a boundary portion between the inner peripheral surface of the cylindrical portion 26a and the upper surface of the inner peripheral side engaging portion 26c are respectively 0. R of 5 mm is formed.

  The rotary saw 20 is formed by assembling the pressing member 26 to the saw body 21 and the auxiliary plate 25 fixed by the countersunk bolt 27, and the rotary saw 20 is attached to the saw mounting portion 28 by a hexagonal socket bolt 29. Fixed. The saw mounting portion 28 is configured as shown in FIG. 7, and is provided with a central shaft 28a, two drive pins 28b, and a screw hole 28c, similar to the saw mounting portion 18 described above. The central axis 28a has the same diameter as the central axis 18a and has a shorter projection length than the central axis 18a. The protruding length of the central shaft 28 a is set to a length that does not protrude from the upper surface of the rotary saw 20.

  Further, the drive pin 28b has the same diameter as the drive pin 18b, and the protruding length is shorter than that of the drive pin 18b. The projecting length of the drive pin 28 b is set such that the upper end portion does not project from the upper surface of the rotary saw 20. And the screw hole 28c is formed in the magnitude | size which an M8 bolt can screw together. The hexagon socket head cap screw 29 that fixes the rotary saw 20 to the saw mounting portion 28 is composed of an M8 bolt composed of a threaded portion 29a and a head portion 29b. A hexagonal hole 29c is formed. The method of assembling the rotary saw 20, the method of fixing the rotary saw 20 to the saw mounting portion 28 using the hexagon socket head bolt 29, and the method of cutting the workpiece using the rotary saw 20 are the same as those in the first embodiment. Since it is the same, the description is omitted.

  As described above, in the rotary saw 20 according to the present embodiment, since the inner peripheral surface of the main body side connection hole 23 is formed in a tapered shape, the entire inner peripheral surface of the main body side connection hole 23 can be used as an engagement surface. . For this reason, even if the thickness of the saw body 21 is reduced to 3 mm, it is possible to ensure sufficient strength to withstand the fixing. The other operational effects of the rotary saw 20 and its mounting structure are the same as the operational effects of the rotary saw 10 and its mounting structure.

  Further, the rotary saw and the rotary saw mounting structure according to the present invention are not limited to the above-described embodiments, and can be implemented with appropriate modifications. For example, in the embodiment described above, the saw mounting surfaces of the saw mounting portions 18 and 28 are flat, but a concave portion can be formed in a portion of the saw mounting surface facing the pressing members 16 and 26. In this case, the lower ends of the pressing members 16 and 26 may protrude from the lower surfaces of the rotary saws 10 and 20. That is, as shown in FIG. 8, the recess 38 a is formed in the opening peripheral portion of the screw hole 38 c in the saw attachment portion 38, and the main body side connection hole 33 of the saw body 31 and the auxiliary plate side connection hole 35 b of the auxiliary plate 35. The lower end of the pressing member 36 on the inner peripheral side engaging portion 36c side of the pressing member 36 may protrude downward from the lower surface of the auxiliary plate 35 as long as it does not contact the bottom surface of the recess 38a.

  In the embodiment described above, the object to be cut is a rough cast of a cylinder head. However, the object to be cut may be other as long as it is cut. In that case, the directions of the rotary saws 10 and 20 are not limited to the horizontal direction, but are changed according to the fixed state of the workpiece. Further, the entire inner peripheral surface of the main body side connecting hole 23 may not be a tapered surface, and only a part of the inner peripheral surface may be a tapered surface according to the thickness of the saw body 21. Further, the size, shape, material, and configuration of each part of the rotary saws 10 and 20 and the saw attachment portions 18 and 28 are not limited to the above-described embodiments, and are appropriately changed within the technical scope of the present invention. be able to.

  DESCRIPTION OF SYMBOLS 10,20 ... Rotary saw 11, 21, 31 ... Saw body, 12, 22 ... Blade part, 13, 23, 33 ... Main body side connection hole, 13a ... Step part, 15, 25, 35 ... Auxiliary plate, 15b, 25b, 35b ... auxiliary plate side connecting hole, 16, 26, 36 ... pressing member, 16b, 26b ... outer peripheral side engaging portion, 16c, 26c, 36c ... inner peripheral side engaging portion, 18, 28, 38 ... saw Mounting portion, 18c, 28c, 38c ... screw hole, 19, 29 ... hexagon socket head cap screw, 19b, 29b ... head.

Claims (4)

A rotary saw that cuts a workpiece by being attached to a saw mounting portion of a cutting device and rotating,
A plurality of body-side connecting holes and a plurality of screw holes are formed in a disc shape and provided with a blade portion on the outer periphery thereof, and the opening on one surface has a larger diameter than the opening on the other surface at the center side. a saw body respectively provided at a distance,
Plate-like formed plurality of auxiliary plate side connection holes at the same interval as the plurality of body-side connecting hole in the outer peripheral side thereof is provided Rutotomoni, the opening of the one surface at the same interval as the plurality of screw holes and the other than the opening face provided with a plurality of fixing holes smaller diameter, Rutotomoni, the plurality fixing holes of the plurality fit the plurality of auxiliary plates side connecting hole in the plurality of body-side connecting hole An auxiliary plate installed on the other surface of the saw body according to the screw hole ;
An outer peripheral side engaging portion that is formed in a cylindrical shape and that can be engaged with the inner peripheral portion of the main body side connecting hole is provided on one of the outer peripheral portions, and an inner portion that protrudes toward the inner peripheral side on the other inner peripheral portion. A peripheral engagement portion is provided, and the outer peripheral engagement portion is inserted from the main body side connection hole toward the auxiliary plate side connection hole in a state where the outer peripheral side engagement portion is engaged with the inner peripheral portion of the main body side connection hole. A plurality of pressing members ;
A plurality of countersunk bolts inserted through the plurality of fixing holes and screwed into the plurality of screw holes, respectively ;
A rotary saw characterized in that respective end portions of the pressing member and the countersunk bolt located on the auxiliary plate side do not protrude outward from the auxiliary plate .   The main body side connecting hole is formed by a stepped hole having a large diameter on one side and a small diameter on the other side, and the outer peripheral side engaging portion of the pressing member is engageable with the step portion of the main body side connecting hole. The rotary saw according to claim 1, comprising a flange-like protrusion having   The main body side connecting hole is formed by a tapered hole having a gradually decreasing diameter from one side to the other, and the outer peripheral side engaging portion of the pressing member can be engaged with the tapered surface of the main body side connecting hole. The rotary saw according to claim 1, wherein the rotary saw comprises a flange-like protrusion having a tapered surface. A rotary saw mounting structure in which the rotary saw according to any one of claims 1 to 3 is mounted on a saw mounting portion of the cutting device,
A plurality of screw holes are provided in the saw attachment surface facing the auxiliary plate in the saw attachment portion at the same interval as the plurality of main body side connection holes, and a plurality of bolts are inserted through the plurality of pressing members. The auxiliary plate is passed through the main body side connecting hole and the auxiliary plate side connecting hole, and the heads of the plurality of bolts are engaged with the inner peripheral side engaging portions, respectively. A rotating saw mounting structure, wherein the plurality of bolts are screwed into the plurality of screw holes in a pressed state.

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