JP5723758B2 - Cutting tools - Google Patents

Description

  The present invention relates to a cutting tool for removing burrs.

  When a plurality of machining holes are formed in the work material by a drill or the like, so-called burrs remain at the intersections of the machining holes that intersect each other. As a tool for efficiently removing this burr, Patent Document 1 discloses a deburring device in which a rotating shaft portion and a tip end of the rotating shaft portion can be protruded and protruded in a radial direction, and a cutting edge is provided on a side surface of the protruding and protruding portion. A cross hole deburring tool comprising a tip and biasing means for biasing the deburring tip in the protruding direction is described. As such a cutting tool, a tool that can more efficiently remove burrs is desirable.

Japanese Patent Application Laid-Open No. 2006-136992

  One of the objects of the present invention is to provide a cutting tool that can efficiently remove burrs.

  A cutting tool according to an embodiment of the present invention includes a substantially columnar holder, and a first cutting portion that is located on an outer peripheral portion of the holder and has a first cutting edge, and the holder opens to the outer peripheral portion. The first cutting portion is at least partially housed in the insert pocket, has the first cutting edge at the edge, and the first cutting portion A substantially disc-shaped cutting insert partially protruding outward from the opening, and an urging force urging the cutting insert accommodated in the insert pocket outward from the opening The cutting insert is accommodated in the insert pocket so that a central axis is substantially perpendicular to a rotation axis of the holder and is rotatable about the central axis.

  The cutting tool which concerns on embodiment of this invention has the insert pocket which the substantially columnar holder has the opening part opened to the outer peripheral part. And a substantially disc-shaped cutting insert in which at least a part is accommodated in the insert pocket and a part of the first cutting edge located at the edge protrudes outward from the opening of the insert pocket, and the insert pocket The 1st cutting part which has the urging means which urges | biases the cutting insert accommodated in the inside toward the outward from the said opening part is located in the outer peripheral part of a holder. Therefore, when a part of the protruding first cutting edge comes into contact with the inner wall surface of the machining hole, a part of the first cutting edge protruding against the urging force of the urging means is pushed into the insert pocket. And when it stops contacting the inner wall surface of the machining hole, a part of the first cutting edge again protrudes outward from the opening of the insert pocket by the biasing force of the biasing means. Therefore, the first cutting edge follows the shape of the inner wall surface of the machining hole and continues to contact the inner wall surface of the machining hole. In addition, the cutting insert is housed in the insert pocket so that the center axis is substantially perpendicular to the rotation axis of the holder and can be rotated around the center axis, so that the cutting tool is rotated around the rotation axis of the holder. When inserted into the machining hole, the cutting insert rotates smoothly, and the burrs can be efficiently removed in combination with the effects of the configuration of the cutting insert and the biasing means described above.

It is a side view which shows the cutting tool which concerns on embodiment of this invention. FIG. 2 is an enlarged view showing the cutting tool of FIG. 1, (a) is a partially enlarged side view seen from the direction of arrow a in FIG. 1, and (b) is an enlarged front end view seen from the direction of arrow b in FIG. (A) And (b) is a disassembled perspective view which shows the cutting tool of FIG. It is an enlarged view which shows the cutting insert with which the cutting tool of FIG. 1 is provided, (a) is an enlarged side view, (b) is an enlarged plan view (top view). 2 is an enlarged cross-sectional view showing the cutting tool of FIG. 1, wherein (a) is a partially enlarged cross-sectional view of the cutting tool and its vicinity in FIG. It is the expanded sectional view which cut | disconnected the 1 cutting part vicinity in the transversal direction. (A)-(c) is explanatory drawing which shows the removal method of the burr | flash which concerns on embodiment of this invention in order of a process. It is a partial expansion explanatory view showing a burr removal method according to an embodiment of the present invention.

<Cutting tools>
Hereinafter, the cutting tool which concerns on embodiment of this invention is demonstrated in detail using FIGS.
As shown in FIG. 1 and FIG. 2, the cutting tool 1 of the present embodiment is provided with a substantially columnar holder 2 and a first cutting portion 3 located on the outer peripheral portion 21 of the holder 2, and the holder The second cutting portion 4 is further provided at the two distal end portions 22. Hereinafter, each component of the cutting tool 1 is demonstrated in order.

  The holder 2 of the present embodiment has a substantially cylindrical shape, and can rotate around the rotation axis S1. The holder 2 can form a flow path for flowing a cutting fluid or the like inside, and can form discharge holes communicating with the flow path in the outer peripheral portion 21 or the distal end portion 22. Thereby, the burr | flash removal by the cutting tool 1 can be performed on wet conditions. The holder 2 has a shank portion 23 located at the base end portion. The shank part 23 is a part attached to the rotating shaft of the machine tool.

  The first cutting part 3 of the present embodiment is a part that removes small burrs from the remaining burrs and performs precision finishing of the machining holes, and is located in a region on the distal end 22 side of the outer peripheral part 21. Yes. As shown in FIG. 3, the first cutting portion 3 has a substantially disc-shaped cutting insert (hereinafter referred to as “insert”) 31 and a biasing means 32 that biases the insert 31 outward. doing.

  As shown in FIG. 4, the substantially disc-shaped insert 31 has a first cutting edge 314 at the edge. More specifically, the insert 31 has an upper surface 311 and a lower surface 312. The insert 31 has a rotationally symmetric configuration around a line L perpendicular to the midpoint M of the line segment between the upper surface 311 and the lower surface 312 of the central axis S2. The central axis S2 of the insert 31 is an axis that penetrates between the upper surface 311 and the lower surface 312 and means an axis that becomes a rotation axis when the insert 31 is rotated in a top view. The top view means a state where the insert 31 is viewed from the upper surface 311 side unless otherwise specified.

  The insert 31 further has a substantially curved side surface 313 connected to each of the upper surface 311 and the lower surface 312. The edge part of the insert 31 mentioned above shall mean the intersection part of the upper surface 311 and the side surface 313, and the intersection part of the lower surface 312 and the side surface 313. Therefore, the insert 31 of the present embodiment includes, as the first cutting edge 314 located at the edge, the first upper cutting edge 314a located at the intersection of the upper surface 311 and the side surface 313, and the lower face 312. And a first lower cutting edge 314b located at the intersection with the side surface 313.

  The first upper cutting edge 314 a is located over the entire circumference of the upper surface 311, and the first lower cutting edge 314 b is located over the entire circumference of the lower surface 312. Accordingly, when the burr is removed while the insert 31 is rotated, the entire cutting blade is used evenly, and therefore, uneven wear of the first upper cutting blade 314a and the first lower cutting blade 314b can be suppressed. it can.

  The upper surface 311 has an upper flat surface 311a located on the central axis S2 side, and an upper inclined surface 311b that is inclined so as to go to the lower surface 312 from the upper flat surface 311a toward the side surface 313. . Similarly, the lower surface 312 has a lower flat surface 312a located on the central axis S2 side, and a lower inclined surface 312b that is inclined so as to be directed toward the upper surface 311 from the lower flat surface 312a toward the side surface 313. doing. Thereby, the impact received when removing the burr is easily dispersed, and the first upper cutting edge 314a and the first lower cutting edge 314b can be prevented from being damaged.

  At least a part of the insert 31 described above is accommodated in the insert pocket 24 of the holder 2. That is, as shown in FIG. 3, the holder 2 of the present embodiment further has an insert pocket 24 that houses at least a part of the insert 31. The insert pocket 24 is an upper surface of the cutout portion 241 formed by cutting out a part of the outer peripheral portion 21 located in the region on the tip end portion 22 side of the holder 2 in a direction perpendicular to the rotation axis S1. This is a portion penetrating between the central portion of 241a and the outer peripheral portion 21 located corresponding to the central portion.

  The insert pocket 24 includes a first opening 242 that opens at the center of the upper surface 241 a of the notch 241, a second opening 243 that opens at the outer periphery 21, a first opening 242, and a second opening 242. And an insert housing portion 244 that is located between the opening portions 243 and houses at least a part of the insert 31.

  The first opening 242 has a slightly larger shape than the insert 31. The insert 31 is accommodated in the insert accommodating portion 244 through the first opening 242.

  The second opening 243 has a moderately smaller shape than the insert 31, and when the insert 31 is accommodated in the insert accommodating part 244, a part of the first cutting edge 314 is removed from the second opening 243. This is the part that protrudes in the direction. The first cutting edge 314 preferably protrudes outward from the second opening 243 to the extent that burrs can be removed.

  The insert accommodating portion 244 of the present embodiment can accommodate the entire insert 31 when the insert 31 is accommodated in a state where a part of the first cutting blade 314 does not protrude from the second opening 243, and the first When the insert 31 is accommodated in a state where a part of the cutting blade 314 protrudes from the second opening 243, the insert 31 can be accommodated so that the insert 31 is in the following states (i) and (ii). It has a shape.

(I) As shown in FIG. 2A, the center axis S2 of the insert 31 is substantially perpendicular to the rotation axis S1 of the holder 2, and the insert 31 is rotatable about the center axis S2. More specifically, as shown in FIG. 7 described later, the center axis S2 of the insert 31 is substantially perpendicular to the rotation axis S1 so as not to intersect the rotation axis S1 of the holder 2, and the insert 31 is centered. It can rotate around the axis S2.
(Ii) As shown in FIG. 5A, when the cutting tool 1 is sent in the direction of arrow A, the insert 31 can rotate in the direction of arrow B about the central axis S2. That is, a part of the first cutting edge 314 protruding from the second opening 243 can rotate in the opposite direction to the feed direction indicated by the arrow A direction of the cutting tool 1.

  The insert 31 accommodated in the insert pocket 24 described above is urged by the urging means 32 from the second opening 243 toward the outside in the arrow C direction. Here, as shown in FIGS. 3A and 5A, the insert pocket 24 of the present embodiment has a pair of locking portions 245 located in the vicinity of the second opening 243 of the insert accommodating portion 244. 245. The pair of locking portions 245 and 245 are portions that contact the side surface 313 of the insert 31 and lock the insert 31. Accordingly, the insert 31 accommodated in the insert pocket 24 is urged by the urging means 32 from the second opening 243 toward the outer side in the direction of arrow C, and the pair of locking portions 245. 245. The locking portion 245 of the present embodiment has a shape that makes surface contact with the side surface 313 of the insert 31 and is integrally formed with the insert housing portion 244.

  Further, the biasing means 32 of this embodiment is a so-called spring plunger, and as shown in FIG. 5, a spring 321 and a pin 322 connected to one end of the spring 321 and in contact with the side surface 313 of the insert 31. And have. The pin 322 has a substantially hemispherical end 322a on the side in contact with the side surface 313 of the insert 31. Thereby, since the edge part 322a comes to contact smoothly with the side surface 313, when the insert 31 is rotated, it can suppress that a sliding damage generate | occur | produces on the side surface 313.

  Note that the holder 2 of the present embodiment further includes a cover 25 as shown in FIGS. 3 and 5. The first opening 242 of the insert pocket 24 is closed by attaching the cover 25 to the upper surface 241a of the notch 241 after the insert 31 is accommodated in the insert accommodating portion 244.

  The cover 25 is attached at both ends of the cover 25 by inserting a tightening screw 252 through a pair of first through holes 251 and 251 penetrating between the upper surface and the lower surface of the cover 25. This is done by screwing the tip part into a screw hole 246 located on the outer peripheral part of the upper surface 241a of the notch part 241.

  Further, the cover 25 has a second through hole 253 that is located in the central portion and penetrates between the upper surface and the lower surface of the cover 25. When the cover 25 is attached to the upper surface 241 a of the notch 241, the urging means 32 described above is fitted into the second through hole 253 and fixedly held by the cover 25.

  On the other hand, the 2nd cutting part 4 located in the front-end | tip part 22 of the holder 2 is a site | part which removes a big burr | flash from the remaining burr | flash, and rough-finishes a processing hole. The second cutting part 4 of the present embodiment is formed integrally with the holder 2. Thereby, it can suppress that the 2nd cutting part 4 remove | deviates from the front-end | tip part 22 of the holder 2 by the comparatively big impact received when removing a big burr | flash, and can remove a burr | flash stably.

  As a method of forming the second cutting part 4 integrally with the holder 2, for example, a method of cutting the tip 22 of the holder 2 into the shape of the second cutting part 4 or a welding of the second cutting part 4 to the tip 22. Although the method of fixing etc. is mentioned, it is not limited to these.

  As shown in FIG. 2B, the second cutting part 4 has a substantially cross shape when viewed from the front end. The front end view means a state in which the cutting tool 1 is viewed from the front end 22 side of the holder 2 unless otherwise specified. Moreover, the 2nd cutting part 4 protrudes outward from the front-end | tip part 22, as shown to Fig.2 (a).

  As shown in FIG. 2B, the second cutting part 4 is configured by a pair of strip-like cutting parts 41 and 41 that intersect with each other so as to be orthogonal to each other at the center part of the tip part 22 when viewed from the tip. Has been.

  The second cutting part 4 has a plurality of second cutting edges 42 located at the edge of the belt-like cutting part 41. Each of the second cutting blades 42 is continuous with the first cutting region 42a, which is linear, and the first cutting region 42a in order from the central portion side of the tip portion 22, and the second cutting blade 42 of the holder 2 moves toward the outer peripheral side of the holder 2. And a second cutting region 42b inclined toward the base end side, that is, the shank portion 23 side. Thereby, it becomes easy to insert the cutting tool 1 into the machining hole, and it is easy to disperse a relatively large impact received when removing a large burr, and it is possible to suppress the second cutting edge 42 from being lost. As described above, the second cutting region 42b of the present embodiment is continuous with the first cutting region 42a. For example, the first cutting region 42b is connected to the first cutting region 42b through another cutting region having an outwardly convex curved shape. You may connect to the area | region 42a.

<Burr removal method>
Next, the burr removal method according to the embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 6A, inside the work material 100, the first machining hole 101 intersects the first machining hole 101 substantially perpendicularly to the first machining hole 101 by a drill or the like, and from the first machining hole 101. The second processing hole 102 having a small diameter is formed in this order. The burr 104 remains at the intersection 103 between the first processing hole 101 and the second processing hole 102 so as to be positioned in the first processing hole 101. In the present embodiment, the removal of the burr 104 remaining in the first processing hole 101 is performed by the cutting tool 1 described above.

  More specifically, first, the cutting tool 1 is rotated in the direction of arrow D around the rotation axis S1 of the holder 2. In this embodiment, the insert 31 is accommodated in the insert pocket 24 with the upper surface 311 facing forward in the rotational direction. Therefore, the removal of the burr 104 by the first cutting unit 3 is performed by the first upper cutting edge 314a of the first upper cutting edge 314a and the first lower cutting edge 314b. The rotation direction of the cutting tool 1 is not particularly limited, and the cutting tool 1 may be rotated in the direction opposite to the arrow D direction. In this case, the removal of the burr 104 by the first cutting unit 3 is performed by the first lower cutting edge 314b.

  Next, the cutting tool 1 is sent in the direction of arrow A while rotating, and the cutting tool 1 is inserted into the first processing hole 101 as shown in FIGS. 6B and 7. At this time, when a part of the first upper cutting edge 314a protruding from the second opening 243 comes into contact with the inner wall surface of the first processing hole 101, the urging force indicated by the urging means 32 in the direction of arrow C is resisted. A part of the protruding first upper cutting edge 314a is pushed into the insert accommodating portion 244. Then, when the contact with the inner wall surface of the first processing hole 101 stops, a part of the first upper cutting edge 314 a again protrudes outward from the second opening 243 by the urging force of the urging means 32. Therefore, the first upper cutting edge 314a follows the shape of the inner wall surface of the first machining hole 101 and continues to contact the inner wall surface of the first machining hole 101. Further, since the insert 31 is accommodated in the insert accommodating portion 244 so as to be in the states (i) and (ii) described above, the insert 31 smoothly rotates in the direction of arrow B, and the insert 31 In combination with the effect of the configuration of the biasing means 32, the burrs can be efficiently removed.

  In the present embodiment, the large burrs 104 among the remaining burrs 104 are removed by the second cutting edge 42 of the second cutting unit 4 rotating in the direction of arrow D, and the small burrs 104 are removed. The first upper cutting edge 314a of the first cutting part 3 rotating in the direction of arrow D and in the direction of arrow B is used. Thereby, the impact which each of the 1st upper cutting blade 314a and the 2nd cutting blade 42 receives can be reduced, the defect | deletion of each cutting blade 314a and 42 can be suppressed, and the burr | flash 104 can be removed stably.

  Next, after the cutting tool 1 passes through the burr 104, as shown in FIG. 6C, the cutting tool 1 is rotated in the arrow E direction opposite to the arrow D direction from the first machining hole 101 in the arrow F direction. The cutting tool 1 is separated from the work material 100 by being extracted. When the cutting tool 1 is extracted from the first processing hole 101, the insert 31 rotates in the direction opposite to the arrow B direction.

  In the present embodiment, the burr 104 remaining in the first processed hole 101 is removed through the above-described steps. In the case where the removal of the burr 104 is continued, the cutting tool 1 is inserted into the machining hole formed in the work material 100 while maintaining the state in which the cutting tool 1 is rotated. What is necessary is just to repeat the process shown by 6 (b) and FIG.6 (c). When the first upper cutting edge 314a and the second cutting edge 42 used are worn, the cutting tool 1 is rotated in the direction opposite to the arrow D direction, or the upper surface 311 and the lower surface 312 of the insert 31 are turned over. Then, the burr 104 may be removed using the unused first lower cutting edge 314b or second cutting edge 42.

  Note that the present invention is not limited to the above-described embodiment, and it goes without saying that many modifications and changes can be made within the scope of the present invention.

  For example, in the above-described embodiment, the holder 2 has a substantially cylindrical shape. However, instead of this, for example, the holder 2 can have a polygonal column shape such as a square column.

  Further, in the above-described embodiment, the side surface 313 of the insert 31 is substantially curved, but instead, for example, when viewed from above, the side surface 313 has a substantially polygonal shape and can be rotated. 313 may be configured by a plurality of planes.

  Moreover, in the above-mentioned embodiment, although the latching | locking part 245 has the shape which can carry out surface contact with the side surface 313 of the insert 31, it replaces with this, for example, the latching | locking part 245 can be point-contacted with the side surface 313 of the insert 31. You may comprise in such a shape.

  In the above-described embodiment, a spring plunger is employed as the biasing means 32. However, instead of this, a spring such as a leaf spring may be employed.

  Moreover, in the above-mentioned embodiment, although the 2nd cutting part 4 is shape | molded integrally with the holder 2, it replaces with this and you may comprise the 2nd cutting part 4 so that removal from the holder 2 is possible. Thereby, when the 2nd cutting edge 42 of the 2nd cutting part 4 is worn out or missing, the holder 2 is removed by removing the second cutting part 4 from the holder 2 and attaching a new second cutting part 4 to the holder 2. It can be used continuously and has the effect of being economically superior.

  Moreover, in the above-mentioned embodiment, although the 2nd cutting part 4 is comprised by the cross shape in front end view by the pair of strip | belt-shaped cutting parts 41 and 41, it replaces with this, for example, a pair of groove-shaped cutting part May be crossed so as to be orthogonal to each other at the center portion of the tip portion 22, whereby the second cutting portion 4 may be configured in a substantially cross shape in the tip view. In the case of this embodiment, the 2nd cutting blade 42 will be located in an upper end edge part among groove-shaped cutting parts.

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Holder 21 Outer peripheral part 22 Tip part 23 Shank part 24 Insert pocket 241 Notch part 241a Upper surface 242 1st opening part 243 2nd opening part 244 Insert accommodating part 245 Locking part 246 Screw hole 25 Cover 251 1st penetration Hole 252 Clamping screw 253 Second through hole 3 First cutting part 31 Cutting insert 311 Upper surface 311a Upper flat surface 311b Upper inclined surface 312 Lower surface 312a Lower flat surface 312b Lower inclined surface 313 Side surface 314 First cutting blade 314a First upper cutting blade 314b First lower cutting edge 32 Biasing means 321 Spring 322 Pin 322a End part 4 Second cutting part 41 Band-like cutting part 42 Second cutting edge 42a First cutting area 42b Second cutting area 100 Work material 101 First machining hole 102 Second machining hole 103 Intersection 104 Burr S1 Rotation S2 central axis

Claims (11)

A substantially columnar holder;
A first cutting part located on the outer periphery of the holder and having a first cutting edge,
The holder has an insert pocket having an opening that is open to the outer periphery;
The first cutting part is
Circular upper and lower surfaces;
A curved side surface connected to each of the upper surface and the lower surface;
A first cutting edge provided at an intersecting line portion between the upper surface and the side surface and an intersecting line portion between the lower surface and the side surface;
And at least partially housed in the insert pocket, whether One the first cutting insert partially circular plate shape that protrude outward from the opening of the cutting edge,
Biasing means biasing the cutting insert accommodated in the insert pocket outward from the opening, and
The cutting insert has a central axis that penetrates between the upper surface and the lower surface substantially perpendicular to the rotation axis of the holder, and is in contact with the work material when the cutting tool is sent around the central axis . A cutting tool which is rotatably accommodated in the insert pocket.   The cutting insert is housed in the insert pocket such that a part of the first cutting edge protruding outward from the opening is rotatable in the direction opposite to the feeding direction of the cutting tool. The cutting tool according to claim 1. The insert pocket further has a locking portion located in the vicinity of the opening,
The cutting tool according to claim 1 or 2, wherein the cutting insert is locked to the locking portion in a state of being biased outward from the opening by the biasing means.   The cutting tool according to any one of claims 1 to 3, wherein the biasing means includes a spring and a pin connected to one end of the spring and in contact with the cutting insert.   The cutting tool according to claim 4, wherein the pin has a substantially hemispherical end on the side in contact with the cutting insert.   The cutting tool according to claim 1, further comprising a second cutting portion located at a tip portion of the holder and having a second cutting edge.   The cutting tool according to claim 6, wherein the second cutting part is formed integrally with the holder.   The cutting tool according to claim 6 or 7, wherein the second cutting part has a substantially cross shape in a front end view.   The cutting tool according to any one of claims 6 to 8, wherein the second cutting portion protrudes outward from the tip portion.   The cutting tool according to any one of claims 6 to 9, wherein the second cutting portion is a pair of strip-shaped cutting portions that intersect with each other so as to be orthogonal to each other at a center portion of the tip portion when viewed from the tip.   The second cutting edge is located at the edge of the strip-shaped cutting portion, and in order from the central portion side of the tip portion, the first cutting region that is linear and the outer periphery side of the holder, The cutting tool of Claim 10 which has a 2nd cutting area | region which inclines in the base end part side of a holder.

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