JP6243773B2 - Milling tools - Google Patents

Description

  The present invention relates to a milling tool.

  In conventional machining, when cutting the surface of a workpiece, a cutting tool such as a milling cutter is used. However, if the machining accuracy is reduced due to tool breakage or wear, the tool needs to be replaced. For example, as shown in Patent Document 1, there has been proposed a milling cutter that allows easy blade replacement.

JP 2013-146790 A

  Even if the blade is exchangeable as in Patent Document 1, even if it is a blade-exchangeable rotary tool, when machining a workpiece that is difficult to machine, such as a difficult-to-cut material, the blade until the machining accuracy decreases Because of the short service life, running costs such as tool change increase. Further, in the initial state and the exchange state, there is a problem that the machining accuracy is lowered because the blade is worn.

  The present invention was created to solve these problems, and provides a milling tool capable of reducing running costs and improving machining accuracy and performing highly efficient and efficient machining. The task is to do.

  In order to solve the above-described problems, the present invention provides a milling tool that turns around the axis of a tool axis to cut the surface of a workpiece, and the axis of a rotary axis that is orthogonal to the tool axis at a tool tip. A rotating drum body rotatably provided around, a fixed abrasive wire spirally wound around the rotating drum body, a wire feeding means for feeding the fixed abrasive wire to the rotating drum body, and the rotating drum A milling tool characterized by comprising a turning means for turning a body around the axis of the tool axis.

  The “cutting” in the present invention is a process using a fixed abrasive wire, and includes grinding. According to such a configuration, the fixed abrasive wire wound around the rotating drum body rotates with the rotating drum body and turns around the axis of the tool shaft, whereby the blade is configured on the surface of the rotating drum body. Can be milled. Further, there is no need to change tools, and the fixed abrasive wire is replaced after being reused several times, so that the running cost can be reduced. Further, since the blade for cutting the workpiece is composed of a fixed abrasive wire fed to the pulley, new blades (fixed abrasive wire) are sequentially supplied during processing. Accordingly, it is possible to perform efficient processing with high processing accuracy and high productivity. Furthermore, since the cutting direction of the blade is sequentially rotated by turning the rotating drum body, the surface roughness of the workpiece can be made fine, and planar processing with extremely high processing accuracy can be performed.

  According to a second aspect of the present invention, a spirally extending wire receiving groove is formed on the outer peripheral surface of the rotating drum body, and a part of the cross section of the fixed abrasive wire is received in the wire receiving groove. The remaining portion of the cross section is wound around the rotating drum body in a state of protruding from the wire receiving groove. According to such a configuration, the fixed abrasive wires are arranged at predetermined intervals, and a uniform blade can be formed on the surface of the rotating drum body.

  The invention according to claim 3 is characterized in that a turning unit is formed by the rotating drum body, the fixed abrasive wire, and the wire feeding means, and the turning unit is turned together by the turning means. And According to such a configuration, since the rotating drum body can be continuously turned, efficient milling can be performed.

  According to the present invention, it is possible to reduce manufacturing costs and running costs and improve processing accuracy, and it is possible to perform efficient processing with high productivity.

It is the schematic front view which showed the tool for milling which concerns on 1st embodiment of this invention. It is the perspective view which showed the processing state of the tool for milling which concerns on 1st embodiment of this invention. It is the expanded sectional view which showed the rotating drum body and fixed abrasive wire of the tool for milling which concerns on 1st embodiment of this invention. It is the figure which showed the tool for milling which concerns on 2nd embodiment of this invention, Comprising: (a) is a schematic front view, (b) is a schematic plan view. (A), (b) is the schematic plan view which showed the state which the tool for milling which concerns on 2nd embodiment of this invention turned rightward from the state of FIG. (A), (b) is the schematic plan view which showed the state which the tool for milling which concerns on 2nd embodiment of this invention turned in the left direction from the state of FIG. It is the figure which showed the tool for milling which concerns on 3rd embodiment of this invention, Comprising: (a) is a schematic front view, (b) is a schematic plan view. (A), (b) is the schematic plan view which showed the state which the tool for milling which concerns on 3rd embodiment of this invention turned in the right direction from the state of FIG. (A), (b) is the schematic plan view which showed the state which the tool for milling which concerns on 3rd embodiment of this invention turned further rightward from the state of (b) of FIG. (A), (b) is the schematic plan view which showed the state which the tool for milling which concerns on 3rd embodiment of this invention turned in the left direction from the state of FIG.

  Below, the tool for milling which concerns on embodiment of this invention is demonstrated. As shown in FIG. 1, in this embodiment, the case where the tool axis | shaft 11 is extended in the perpendicular | vertical direction is mentioned as an example, The positional relationship of each member is demonstrated on the basis of the upper and lower sides and the right and left of the state shown in FIG. . Note that the extending direction of the tool shaft 11 is not limited to the vertical direction.

  The milling tool 1 is a milling tool for cutting the surface 3 of the workpiece 2. The milling tool 1 includes a rotating drum body 10, a fixed abrasive wire 20 spirally wound around the rotating drum body 10, a wire feeding means 30 that feeds the fixed abrasive wire 20 to the rotating drum body 10, and rotation. A turning means (not shown) for turning the drum body 10 around the axis of the tool shaft 11 is provided. In the present embodiment, the rotating unit 5 is formed by the rotating drum body 10, the fixed abrasive wire 20, and the wire feeding means 30. The turning unit 5 is turned together by turning means.

  As shown in FIGS. 1 and 2, the rotary drum body 10 is provided at the tool front end portion so as to be rotatable around the axis of a horizontal rotary shaft 12 orthogonal to the tool shaft 11 (see FIG. 1). Yes. The rotating drum body 10 is configured to rotate together with the rotating shaft 12 around the axis of the tool shaft 11 extending in the vertical direction. The rotating drum body 10 moves along the surface 3 of the workpiece 2 while rotating and turning. The rotary shaft 12 is supported by lower ends of a pair of support arms 13 and 13 that hang from a base material 31 positioned above the rotary drum body 10.

  The rotating drum body 10 is made of tool steel. The rotating drum body 10 only needs to have the necessary rigidity to hold the fixed abrasive wire 20 against the pressure and rotation during processing, and the hardness required for the cutting blade is not required.

  As shown in FIG. 3, a wire housing groove 14 is formed on the outer peripheral surface of the rotating drum body 10. The wire housing groove 14 is formed in a spiral shape along the outer peripheral surface. The wire housing groove 14 has an arcuate inner circumferential cross section, and a part of the cross section of the fixed abrasive wire 20 having a circular cross section is housed in the wire housing groove 14. The central angle of the arc of the wire receiving groove 14 is smaller than 180 degrees. The depth dimension L1 of the wire receiving groove 14 is preferably 1/3 to 1/2 of the diameter of the fixed abrasive wire 20.

  A coolant supply passage 15 is formed in the rotary drum body 10 along the axial direction. A branch channel 16 communicates with the coolant supply channel 15. The branch channel 16 is orthogonal to the coolant supply channel 15 and extends from the coolant supply channel 15 to the outer peripheral surface of the rotary drum body 10. The branch flow path 16 is disposed at a position where it does not interfere with the wire housing groove 14 and the fixed abrasive wire 20, and a plurality of branch flow paths 16 are formed at regular intervals along the axial direction of the rotating drum body 10. The shapes of the coolant supply channel 15 and the branch channel 16 are not limited to the above shapes.

  The fixed abrasive wire 20 is used for a wire saw or the like, and has a hard wire 22 made of diamond abrasive grains fixed to a core wire 21 made of piano wire or the like.

  As shown in FIGS. 1 and 2, the fixed abrasive wire 20 is spirally wound along the wire accommodation groove 14 (see FIG. 3) of the rotary drum body 10. The rotating drum body 10 rotates together with the fixed abrasive wire 20 during milling, and the fixed abrasive wire 20 is wound around the rotating drum body 10 while being sequentially fed. In the fixed abrasive wire 20, a part of the cross section is accommodated in the wire accommodation groove 14, and the remaining part of the cross section protrudes from the wire accommodation groove 14. The remaining portion of the protruding fixed abrasive wire 20 constitutes a blade for milling. Both ends of the fixed abrasive wire 20 are connected to the wire feeding means 30.

  As shown in FIG. 1, the wire feeding means 30 includes a base material 31, a first bobbin 32, a second bobbin 33, and a plurality of guide rollers 34. The base material 31 is a member that integrally supports the first bobbin 32, the second bobbin 33, and the guide roller 34. A tool shaft 11 extending upward is provided at the center of gravity of the base material 31. The wire feeding means 30 is turned through the tool shaft 11.

  The first bobbin 32 and the second bobbin 33 are arranged on the base material 31 at symmetrical positions with the tool shaft 11 interposed therebetween. A drive device (not shown) such as a motor is connected to the first bobbin 32 and the second bobbin 33, and the first bobbin 32 and the second bobbin 33 are configured to be rotatable. The drive device is also integrally supported by the base material 31. One end of the fixed abrasive wire 20 is connected to the body of the first bobbin 32, and the other end of the fixed abrasive wire 20 is connected to the body of the second bobbin 33.

  At the time of milling, one of the first bobbin 32 and the second bobbin 33 (for example, the first bobbin 32) serves as a feeding bobbin, and the other (for example, the second bobbin 33) serves as a winding bobbin. At this time, the fixed abrasive wire 20 is wound around the first bobbin 32 that is a delivery bobbin, and the front end portion of the fixed abrasive wire 20 is a body portion of the second bobbin 33 that is a take-up bobbin. It is connected to the. And the 2nd bobbin 33 is rotationally driven and the fixed abrasive wire 20 is wound up sequentially.

  When milling proceeds and all of the fixed abrasive wire 20 is sent out from the first bobbin 32, the winding bobbin and the sending bobbin are reversed. That is, the other bobbin (second bobbin 33) is a delivery bobbin, and one bobbin (first bobbin 32) is a take-up bobbin. The first bobbin 32 is rotationally driven in the reverse direction to sequentially rewind the fixed abrasive wire 20. When the reverse rotation of the winding bobbin and the delivery bobbin was repeated several times and the fixed abrasive wire 20 was worn, the new fixed abrasive wire 20 was wound around the bobbin of the worn fixed abrasive wire 20. Replace with bobbin.

  The guide roller 34 includes a first guide roller 34a and a second guide roller 34b. The guide roller 34 is provided on each of the side of the first bobbin 32 and the side of the second bobbin 33.

  The first guide roller 34a folds the fixed abrasive wire 20 from the bobbin upward. The first guide roller 34a is configured by a traverser roller that moves in the vertical direction in accordance with the feeding height (or winding height) of the fixed abrasive wire 20 on the bobbin.

The second guide roller 34b folds the fixed abrasive wire 20 from the first guide roller 34a downward. One second guide roller 34 b is disposed above one side end of both ends of the outer peripheral surface of the rotating drum body 10, and the other second guide roller 34 b is one of both ends of the outer peripheral surface of the rotating drum body 10. Arranged above the other end. As a result, the fixed abrasive wire 20 between the second guide roller 34b and the rotating drum body 10 extends substantially vertically. The second guide roller 34b is a dancer roller supported so as to be able to approach and separate from the pulley 10 and moves in the vertical direction to keep the tension of the fixed abrasive wire 20 sent to the pulley 10 constant. Play the role of holding.

  The movement (feeding direction) of the fixed abrasive wire 20 in the first guide roller 34a and the second guide roller 34b described above is that of the guide roller 34 provided on the feeding bobbin side, and is applied to the winding bobbin. In the guide roller 34 provided on the side, the fixed abrasive wire 20 moves in the opposite direction.

  Since the support arms 13 and 13 are provided below the base material 31, the rotating drum body 10 is integrally connected to the wire feeding means 30 via the rotating shaft 12. That is, the rotating unit 5, the fixed abrasive wire 20, and the wire feeding means 30 form the turning unit 5. A turning means (not shown) is connected to the turning unit 5, and the turning unit 5 is turned as a unit.

  When milling is performed with the milling tool 1 having the above-described configuration, as shown in FIG. 2, the rotating drum body 10 is vertically moved while feeding the fixed abrasive wire 20 and rotating the rotating drum body 10. The milling tool 1 is moved along the surface 3 of the workpiece 2 while turning around the axis of the tool axis 11 (see FIG. 1), which is a vertical axis. As a result, the remaining part of the cross section of the fixed abrasive wire 20 protruding from the wire housing groove 14 becomes a blade to scrape the workpiece 2. Since the rotating drum body 10 is rotating at this time, the workpiece 2 can be cut over a wide range on the entire outer peripheral surface of the rotating drum body 10. Further, since the rotating drum body 10 is swiveled, the cutting direction of the blade is sequentially rotated, the surface roughness of the workpiece can be made fine, and planar processing with extremely high processing accuracy can be performed. .

  Furthermore, since the fixed abrasive wire 20 is always fed by the wire feeding means 30, new blades (fixed abrasive wire 20) are sequentially supplied during processing. Therefore, since the blade wear is slow, the machining accuracy is very high. Moreover, since the heat generated by the processing moves away from the workpiece 2 together with the moving fixed abrasive wire 20, the heat is hardly accumulated in the workpiece processing portion.

  Further, since the blade for cutting the workpiece 2 is composed of the fixed abrasive wire 20 fed to the rotary drum body 10, it is not necessary to perform special processing of a hard blade unlike a conventional tool. In addition, there is no need to change the tool that has undergone special processing, and it is only necessary to replace the bobbin around which the fixed abrasive wire 20 is wound after reusing the fixed abrasive wire several times, so that the running cost can be reduced. . Since the fixed abrasive wire 20 is wound around the bobbin, it can be stably supplied over a long period of time.

  Further, the rotating drum body 10, the fixed abrasive wire 20 and the wire feeding means 30 form a turning unit 5, and the turning unit 5 is turned together by the turning means. The wire 20 can be continuously turned. Therefore, the rotating drum body 10 can be turned at high speed, and efficient milling can be performed.

  Next, a milling tool according to a second embodiment of the present invention will be described. In the milling tool 1 according to the first embodiment, the rotating drum body 10, the fixed abrasive wire 20, and the wire feeding means 30 form a turning unit 5, and the turning unit 5 turns together. On the other hand, in the milling tool 1a of the second embodiment, the wire feeding means 50 has a structure that does not turn. In the present embodiment, the positional relationship of each member will be described with reference to the X axis, the Y axis, and the Z axis shown in FIG.

  As shown in FIG. 4, the milling tool 1 a is provided with a tool shaft 11 a extending in the vertical direction (Z-axis direction) above the rotary drum body 10. The tool shaft 11a is connected to a pair of support arms 13a and 13a that extend in a direction that hangs down from the lower end of the tool shaft 11a in the X-axis direction.

  The pair of support arms 13a and 13a are arranged on both sides centered on a downwardly extending portion of the tool shaft 11a, and are provided so as to sandwich the tool shaft 11a from both sides in the X-axis direction. The support arms 13a and 13a are arranged in parallel to the tool shaft 11a. Overhang portions 17a and 17a extending in the X-axis direction and connected to the side surfaces of the tool shaft 11a are provided at the upper ends of the support arms 13a and 13a, respectively. The support arms 13a and 13a are respectively overhang portions 17a and 17a. It is being fixed to the lower end part of tool axis 11a via. The rotary shaft 12 of the rotary drum body 10 is spanned and supported at the lower ends of the support arms 13a and 13a. The rotating shaft 12 extends in the X-axis direction in the state of FIG.

  A central roller 61 that changes the direction of the fixed abrasive wire 20 extending from the wire feeding means 50 is pivotally supported on the tool shaft 11a. Two central rollers 61 are provided with a gap in the vertical direction. The fixed abrasive wire 20 connected from the first bobbin 51 is wound around the upper central roller 61, and the fixed abrasive wire 20 connected from the second bobbin 52 is wound around the lower central roller 61. .

  At both ends in the axial direction of the rotating drum body 10, a position (winding start position) P <b> 1 where the fixed abrasive wire 20 is fed from the wire feeding means 50 to the rotating drum body 10, and the rotating drum body 10 is sent to the wire feeding means 50. Upper guide rollers 62, 62 for turning back the fixed abrasive wire 20 extending from the central roller 61 toward the lower rotating drum body 10 are provided above the position (winding end position) P <b> 2. The rotation shaft of the upper guide roller 62 extends in the horizontal direction. The winding start position P1 and the winding end position P2 are sequentially switched.

  In FIG. 4A, one upper guide roller 62 located on the near side is supported by a branch arm 18a that branches from one (left side of FIG. 4A) support arm 13a. In FIG. 4A, the other upper guide roller 62 located on the back side is supported by the branch arm 18a branched from the other support arm 13a (the right side in FIG. 4A).

  In the present embodiment, the rotating drum body 10 and the upper guide rollers 62 and 62 are a part of the fixed abrasive wire 20 wound around the supporting arms 13a and 13a, the branch arms 18a and 18a and the rotating drum body 10 that support them. Turn with. The turning angle will be described later.

  The wire feeding means 50 includes a first bobbin 51, a second bobbin 52, and a plurality of guide rollers 53. The 1st bobbin 51 and the 2nd bobbin 52 are the structures equivalent to the bobbin of 1st embodiment, Comprising: Each is comprised so that rotation drive is possible.

  The guide roller 53 includes a first guide roller 53a and a second guide roller 53b. The rotation shafts of the first guide roller 53a and the second guide roller 53b both extend in the horizontal direction.

  The first guide roller 53a folds the fixed abrasive wire 20 extending from the bobbin upward. The first guide roller 53a has a height (or a portion where the fixed abrasive wire is wound around the bobbin) of the feeding portion (the portion where the fixed abrasive wire is separated from the bobbin) of the fixed abrasive wire 20 on the bobbin. The traverse roller is configured to move in the vertical direction according to the height.

  The second guide roller 53 b turns back the fixed abrasive wire 20 from the first guide roller 53 a toward the center roller 61.

  The guide rollers 53 are provided on the side of the first bobbin 51 and the side of the second bobbin 52, respectively. The first bobbin 51 and the second bobbin 52 are in a positional relationship of point objects around the axis of the tool shaft 11a in plan view. Further, the guide rollers 53a and 53b positioned on the side of the first bobbin 51 and the guide rollers 53a and 53b positioned on the side of the second bobbin 52 are such that the corresponding guide rollers are in a plan view. The positional relationship of the point object is centered on the axis of the shaft 11a.

  The movement of the fixed abrasive wire 20 in the first guide roller 53a and the second guide roller 53b described above is that of the guide roller 53 provided on the feeding bobbin side and provided on the winding bobbin side. In the guide roller 53, the movement (feeding direction) of the fixed abrasive wire 20 in each guide roller 53a, 53b is opposite.

  Next, the turning state of the rotary drum body 10 in the milling tool 1a configured as described above will be described. FIG. 5 is a view showing a state in which the rotating drum body 10 is turned clockwise in a plan view from the state of FIG. FIG. 6 is a view showing a state in which the rotary drum body 10 is turned counterclockwise in a plan view from the state of FIG. The turning angle shown below is based on the state shown in FIG.

  FIG. 5A shows a state in which the rotating drum body 10 starts to turn clockwise. Thus, when turning clockwise from the state of FIG. 4B, the angle at which the fixed abrasive wire 20 is wound around the central roller 61 becomes large. Here, since the upper guide roller 62 is pivoted integrally with the rotating drum body 10, the fixed abrasive wire 20 turned back by the upper guide roller 62 on the delivery side is wound around the winding start position P1 of the rotating drum body 10. It is sent out downward. In the upper guide roller 62 on the winding side, the fixed abrasive wire 20 wound upward from the winding end position P <b> 2 of the rotary drum body 10 is folded back toward the central roller 61.

  FIG. 5B shows a state in which the rotary drum body 10 is in the limit position for turning clockwise. When turning further clockwise than the turning limit position shown in the figure, the upper guide roller 62 interferes with the fixed abrasive wire 20 between the second guide roller 53b and the central roller 61, and thus cannot turn any further. If it will be in this state, a turning means (not shown) will reverse rotation of a turning motor, and will switch to left-handed turning.

  In the counterclockwise turn, the state of FIG. 5 is reversely rotated to return to the state of FIG. 6 through the state of FIG. 4B. 6A shows a state in which the rotating drum body 10 has been rotated 90 degrees counterclockwise, and FIG. 6B shows a state in which the rotating drum body 10 is at the limit position for turning counterclockwise. . When turning further counterclockwise than the turning limit position shown in the drawing, the fixed abrasive wire 20 hanging from the upper guide roller 62 located on the upper side of the two upper guide rollers 62, 62 is located on the lower side. Since it interferes with the fixed abrasive wire 20 between the guide roller 53b and the central roller 61, it cannot turn any more. If it will be in this state, a turning means (not shown) will reverse rotation of a turning motor, and will switch to clockwise turning.

  As described above, in the milling tool 1a, the rotating drum body 10 can turn in a range of slightly less than 180 degrees. Therefore, the turning means can be repeatedly reversed at a pitch of less than 180 degrees by the turning means. Milling is performed. The turning direction of the rotating drum body 10 is switched by controlling the forward and reverse rotation of the turning motor with the NC device (numerical control device) of the turning means.

  According to the milling tool 1a of the present embodiment, in addition to obtaining the same operational effects as the milling tool 1 of the first embodiment, the first bobbin 51 and the second bobbin 52 do not pivot, so the swivel portion The number of parts can be reduced and the weight can be reduced. As a result, it is possible to obtain an effect that the turning motor can be miniaturized.

  Next, a milling tool according to a third embodiment of the present invention will be described. Similarly to the milling tool 1a of the second embodiment, the milling tool 1b of the third embodiment has a structure in which the wire feeding means 70 does not turn. In the present embodiment, the positional relationship of each member will be described with reference to the X axis, the Y axis, and the Z axis shown in FIG.

  As shown in FIG. 7, the milling tool 1 b is provided with a tool shaft 11 b extending above the rotating drum body 10 in the vertical direction (Z-axis direction). A pair of support arms 13b and 13b extending in a direction that hangs offset from the lower end of the tool shaft 11b in the X-axis direction are coupled to the tool shaft 11b.

  The pair of support arms 13b and 13b are arranged on both sides centering on the downward extending portion of the tool shaft 11b, and are provided so as to sandwich the tool shaft 11b from both sides in the X-axis direction. The support arms 13b and 13b are arranged in parallel to the tool shaft 11b. Overhang portions 17b and 17b extending in the X-axis direction and connected to the side surface of the tool shaft 11b are provided at the upper ends of the support arms 13b and 13b, respectively. The support arms 13b and 13b are respectively overhang portions 17b and 17b. Is fixed to the lower end of the tool shaft 11ba. The rotating shaft 12 of the rotating drum body 10 is spanned and supported at the lower ends of the support arms 13b and 13b. The rotating shaft 12 extends in the X-axis direction.

  A position (winding start position) P1 at which the fixed abrasive wire 20 is fed from the wire feed means 70 to the rotary drum body 10 at both axial ends of the rotary drum body 10 and a feed from the rotary drum body 10 to the wire feed means 70. A pair of upper guide rollers 65, 65 for turning back the fixed abrasive wire 20 extending from the wire feeding means 70 toward the lower rotating drum body 10 is provided above the position (winding end position) P <b> 2. . The rotation shafts (not shown) of the upper guide rollers 65, 65 extend in the horizontal direction. The winding start position P1 and the winding end position P2 are sequentially switched.

  In FIG. 7A, one upper guide roller 65 located on the front side is supported by a branch arm 18b branched from one (left side of FIG. 7A) support arm 13b. In FIG. 7A, the other upper guide roller 65 located on the back side is supported by the branch arm 18b branched from the other (right side of FIG. 7A) support arm 13b. The upper guide roller 65 is supported at the upper end portion of the branch arm 18b so that the rotation shaft can turn.

  In the present embodiment, the rotary drum body 10 and the upper guide rollers 65 and 65 are a part of the fixed abrasive wire 20 wound around the support arms 13b and 13b, the branch arms 18b and 18b, and the rotary drum body 10 that support them. Turn with. The turning angle will be described later.

  The wire feeding means 70 includes a first bobbin 71, a second bobbin 72, and a plurality of guide rollers 73. The 1st bobbin 71 and the 2nd bobbin 72 are the structures equivalent to the bobbin of 1st embodiment, Comprising: Each is comprised so that rotation drive is possible.

  The guide roller 73 includes a first guide roller 73a, a second guide roller 73b, a third guide roller 73c, and a fourth guide roller 73d.

  The first guide roller 73a folds the fixed abrasive wire 20 extending from the bobbin upward. The first guide roller 73a has a height (or a portion where the fixed abrasive wire is wound around the bobbin) of the feeding portion (the portion where the fixed abrasive wire is separated from the bobbin) of the fixed abrasive wire 20 on the bobbin. The traverse roller is configured to move in the vertical direction according to the height.

  The second guide roller 73 b folds the fixed abrasive wire 20 from the first guide roller 73 a in a direction away from the rotary drum body 10. The third guide roller 73c is a dancer roller supported so as to be able to approach and separate from the fourth guide roller 73d, and turns the fixed abrasive wire 20 from the second guide roller 73b in a direction toward the rotating drum body 10. . The third guide roller 73c serves to keep the tension of the fixed abrasive wire 20 sent to the rotary drum body 10 constant.

  The fourth guide roller 73d has a rotating shaft extending in the vertical direction, and folds the fixed abrasive wire 20 from the third guide roller 73c in the horizontal direction toward the upper guide roller 65. The fourth guide roller 73 d is disposed at a position closest to the upper guide roller 65 among the guide rollers 73, and is located at the same height as the upper guide roller 65.

  The position of the fourth guide roller 73d is constant, and the upper guide roller 65 pivots about the axis of the tool shaft 12a, so that the distance between the fourth guide roller 73d and the upper guide roller 65 changes. Since the tension of the fixed abrasive wire 20 is kept constant by the movement of the third guide roller 73c, the fixed abrasive wire 20 does not bend.

  The guide rollers 73 are provided on the side of the first bobbin 71 and the side of the second bobbin 72, respectively. The first bobbin 71 and the second bobbin 72 have a point-target positional relationship centered on the axis of the tool shaft 11b in plan view. Further, the guide rollers 73a to 73d positioned on the side of the first bobbin 71 and the guide rollers 73a to 73d positioned on the side of the second bobbin 72 are such that the corresponding guide rollers are in a plan view. This is a positional relationship of point objects around the axis of the shaft 11b.

  The movement of the fixed abrasive wire 20 in the first guide roller 73a to the fourth guide roller 73d described above is that of the guide roller 73 (see FIG. 7B) provided on the delivery bobbin side. In the guide roller 73 provided on the side of the winding bobbin, the movement (feeding direction) of the fixed abrasive wire 20 in each guide roller 73a to 73d is in the opposite direction.

  Next, the turning state of the rotary drum body 10 in the milling tool 1b configured as described above will be described. 8 and 9 are views showing a state in which the rotating drum body 10 is turned clockwise in a plan view from the state of FIG. 7B. The turning angles shown below are based on the state shown in FIG. 7B (0 degree).

  FIG. 8A shows a state in which the rotating drum body 10 is turned 45 degrees clockwise, and FIG. 8B shows a state in which the rotary drum body 10 is turned 90 degrees clockwise. As described above, when turning clockwise from the state shown in FIG. 7B, the distance between the fourth guide roller 73d and the upper guide roller 65 gradually decreases, so that the third guide roller 73c, which is a dancer roller, is It moves in a direction away from the four guide rollers 73d. As a result, the distance between the upper guide roller 65 and the third guide roller 73c becomes substantially constant, so that the tension of the fixed abrasive wire 20 is kept constant. Therefore, the fixed abrasive wire 20 does not bend.

  FIG. 9A shows a state in which the rotating drum body 10 is rotated 180 degrees clockwise. Here, since the distance between the fourth guide roller 73d and the upper guide roller 65 is gradually increased, the third guide roller 73c, which is a dancer roller, moves in a direction approaching the fourth guide roller 73d. Also here, since the distance between the upper guide roller 65 and the third guide roller 73c is substantially constant, the tension of the fixed abrasive wire 20 is kept constant, and the fixed abrasive wire 20 does not bend.

  FIG. 9B shows a state in which the rotating drum body 10 is in the limit position for turning clockwise. When turning further clockwise than the limit position of turning shown in the drawing, the fixed abrasive wire 20 between the fourth guide roller 73d and the upper guide roller 65 interferes with the tool shaft 11b, so that no further turning is possible. If it will be in this state, a turning means (not shown) will reverse rotation of a turning motor, and will switch to left-handed turning.

  In the counterclockwise turn, the state shown in FIGS. 8 and 9 is rotated in the reverse direction and returned to the state shown in FIG. 10 through the state shown in FIG. 7B. FIG. 10A shows a state in which the rotating drum body 10 has turned 90 degrees counterclockwise, and FIG. 10B shows a state in which the rotating drum body 10 is at the limit position for turning counterclockwise. When turning further counterclockwise than the turning limit position shown in the figure, the fixed abrasive wire 20 between the fourth guide roller 73d and the upper guide roller 65 interferes with the tool shaft 11b, so that no further turning is possible. If it will be in this state, a turning means (not shown) will reverse rotation of a turning motor, and will switch to clockwise turning.

  As described above, in the milling tool 1b, the rotating drum body 10 can turn in a range of slightly less than 360 degrees. Therefore, by reversing the turning direction at a pitch of less than 360 degrees by the turning means. Milling is performed. The turning direction of the rotating drum body 10 is switched by controlling the forward and reverse rotation of the turning motor with the NC device (numerical control device) of the turning means.

  According to the milling tool 1b of the present embodiment, in addition to obtaining the same operational effects as the milling tool 1a of the second embodiment, the swivel angle is larger than that of the second embodiment. The rotating drum body 10 can be turned.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and it is needless to say that the design can be changed as appropriate without departing from the spirit of the present invention. For example, the shape of the wire feeding means 30, 50, 70 shown in the above embodiment is an example, and the position and number of bobbins and guide rollers can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Milling tool 2 Work piece 3 Surface 5 Rotating unit 10 Rotating drum body 11 Tool axis 12 Rotating axis 14 Wire receiving groove 20 Fixed abrasive wire 30 Wire feed means 1a Milling tool 11a Tool axis 50 Wire feed means 1b Milling Tool 11b Tool axis 70 Wire feed means

Claims (3)

A milling tool that turns around the axis of the tool axis to cut the surface of the workpiece,
A rotating drum body rotatably provided around a rotation axis orthogonal to the tool axis at a tool tip, a fixed abrasive wire wound spirally around the rotary drum body, and the fixed abrasive wire A milling tool comprising: wire feeding means for feeding the rotating drum body to the rotating drum body; and turning means for turning the rotating drum body about the axis of the tool shaft. On the outer peripheral surface of the rotating drum body, a wire accommodating groove extending spirally is formed,
The fixed abrasive wire is wound around the rotating drum body in a state in which a part of the cross section is accommodated in the wire accommodating groove and the remaining portion of the cross section protrudes from the wire accommodating groove. The milling tool according to claim 1. A turning unit is formed by the rotating drum body, the fixed abrasive wire, and the wire feeding means,
The milling tool according to claim 1 or 2, wherein the swivel unit is swung integrally by the swivel means.

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