JP5701328B2 - Hollow punching device - Google Patents

Description

  The present invention relates to a hollow machining apparatus for machining and forming a boring product having a bottomed circular hole by hollowing out a central portion from a work such as a crucible or a mortar.

  For example, when cutting the surface of a columnar workpiece made of a carbon-based material to form a boring product having a bottomed circular hole such as a crucible, the boring part is cut with a rotary tool and gradually expanded from a small hole. In order to maintain a working environment, all the bored parts that have been cut are discharged in the form of powder as shavings. In addition, when the collected shaving powder is reused, many steps are required to harden it, and the cost is high when it is reused.

  Therefore, for example, in the case where the workpiece itself to be bored (cut out) such as the above-described carbon-based material is a soft material capable of wire cutting, a circular groove is dug down and the bottom of the circular groove is directed inward. If the wire is cut, the cylindrical body can be easily hollowed out with little shaving, and a bottomed circular hole can be formed in the work, and the hollowed cylindrical body can be reused as the next work as it is. However, a cutting wire for cutting such a wire is arranged around a cylindrical body having a groove cutting edge for excavating a circular groove, or while being pulled, it is pushed inward to be engulfed and moved. It is not easy to provide a wire cutting device that performs wire cutting.

  That is, when cutting the circular groove, the cutting wire is not disturbed, and the cutting wire can be arranged at the bottom of the circular groove smoothly while pulling the cutting wire after forming the circular groove. It is difficult to incorporate a wire cutting device that bites and cuts the wire, and it is not easy to configure such processing to be performed with a simple operation.

  An object of the present invention is to realize a hollow machining apparatus capable of performing both excavation and wire cutting of such a circular groove, and has a configuration capable of easily excavating the circular groove and cutting the wire. The cutting wire that performs cutting can be retreated and held at the retraction position of the cylindrical body that does not interfere with the excavation until the circular groove is cut by the groove cutting blade provided at the lower end of the cylindrical body. After forming the wire, it can be switched to wire-free by a simple operation and the wire can be cut by applying tension to the cutting wire, and sufficient tension is applied to the cutting wire by pulling up from above. It is an object of the present invention to provide an epoch-making punching device that can easily arrange a tension applying device on an upper portion of a cylindrical body and can easily and smoothly perform a punching process by wire cutting.

  The gist of the present invention will be described with reference to the accompanying drawings.

  A hollow machining apparatus for excavating a circular groove 2 in a work 1 and cutting the bottom of the circular groove 2 inward to hollow out a cylindrical body 3 to form a bottomed circular hole 4. A cylindrical body 6 is provided so as to be movable up and down above the turntable 5 to be fixed, and a groove cutting blade 7 is provided at a lower end portion of the cylindrical body 6 so that the workpiece 1 rotating on the turntable 5 is By lowering the cylindrical body 6, the circular groove 2 is dug and cut from the upper surface of the work 1 toward the bottom of the work 1, and the cylindrical body 6 is used for cutting disposed at the bottom of the circular groove 2. A wire cutting device 12 comprising a wire 8 and a tension applying device 9 for applying tension to the cutting wire 8 is provided, and the cutting wire 8 is turned by the tension applied to the cutting wire 8 and the rotation of the workpiece 1. Let go into the inside of the bottom of the circular groove 2 The bottom of the circular groove 2 is cut inward, and the cylindrical body 3 is cut out from the workpiece 1 by wire cutting. The cutting wire 8 is hung around the lower end of the cylindrical body 6. A wire wrapping locking portion 10 for retracting and holding the cutting wire 8 in a state that does not hinder digging cutting by the groove cutting blade 7 is provided movably, and the wire wrapping locking portion 10 is provided. There is provided a wire pulling lock portion 11 for routing and arranging the cutting wire 8 wound around the wire, and applying tension to the cutting wire 8 pulled up from the wire pulling locking portion 11. A tension applying device 9 is provided on the upper portion of the cylindrical body 6, and after the cylindrical body 6 is lowered, the circular groove 2 is cut by the groove cutting blade 7, and then the wire-engaging locking portion 10 is movable. Let the cutting wire The cutting wire 8 is released from the wire holding state by releasing the holding of the wire, and the wire 8 is brought into the wire free state by applying the tension by the tension applying device 9, and the cutting wire 8 is moved upward via the wire pulling engaging portion 11. The wire cutting device 12 is configured such that the wire cutting device 12 is configured to bite into the inside of the bottom of the circular groove 2 and to hollow out the cylindrical body 3 by being pulled up.

  Further, a tool mounting portion 13 that is controlled to move above the turntable 5 of the vertical lathe is provided with the groove cutting blade 7 and the cutting wire 8, the wire wrapping locking portion 10, and the wire lifting locking portion. 11. The hollow machining apparatus according to claim 1, wherein the cylindrical body 6 provided with 11 and the wire cutting device 12 provided with the tension applying device 9 is mounted.

  Further, a plurality of the wire-engaging locking portions 10 are configured to be movable at intervals in the circumferential direction of the lower end portion of the cylindrical body 6, and the wire pulling locking portion 11 is formed at the lower end portion of the cylindrical body 6. The cutting wire 8 provided at two locations opposite to the tube center and held around the plurality of wire-engaging latches 10 is pulled upward from the wire-raising latches 11 at the two opposite locations. The tension applying device (9) for applying a pulling tension to the cutting wire (8) disposed above and disposed above the cylindrical body (6) is provided at the upper part of the cylindrical body (6). The hollow machining apparatus according to any one of the above.

  Further, the wire-engaging latching portion 10 is constituted by a latching body provided so as to be movable in the vertical direction, and the wire-engaging latching portion 10 is moved upward to move the wire-engaging latch 10. The wire 10 that can be horizontally moved inward by releasing the stopper 10 from the wire-engaging latch 10 and the cutting wire 8 that has been hung outside the wire-engaging latch 10. This is in a free state and is disposed around the bottom of the circular groove 2 and is lifted and biased upward by the tension applying device 9 through the wire pulling locking portion 11 provided at intervals. 4. The hollow machining apparatus according to claim 1, wherein a pressing force is generated to the inside of the bottom of the circular groove 2 between the wire pulling locking portions 11. 5. It is.

  The tension applying device 9 is constituted by a cylinder device 14 for applying a tension for pulling and urging the cutting wire 8 disposed above the cylindrical body 6, and the cylinder device 14 provides the cutting wire. The tension | tensile_strength required for the said wire cutting which pulls up 8 and turns the wire 8 for cutting | disconnection arrange | positioned by turning to the said circular groove | channel 2 inside is given. This relates to the hollow machining apparatus described in 1.

  Further, the wire pulling locking portion 11 is provided at two locations facing the cylinder center of the lower end portion of the cylindrical body 6, and the cutting wire hooked and locked to the plurality of wire winding locking portions 10. The cylinder device 14 for pulling up and urging the cutting wire 8 lifted and disposed at the same time above the cylindrical body 6 is disposed by pulling up the wire 8 from the opposing two wire pulling locking portions 11 respectively. The tension applying device 9 is configured horizontally on the upper portion of the cylindrical body 6, and the cutting wire 8 is simultaneously pulled up from both sides by the cylinder device 14 through the two wire pulling locking portions 11. The wire is in a wire-free state, and is pressed against the inside of the cutting wire 8 necessary for cutting, which is disposed between the wire-lifting locking portions 11 so as to be movably turned inside the bottom of the circular groove 2. The tension that generates the force Kumishi those of the punching device in according to claim 5, characterized by being configured to perform the wire cut by the rotation of the workpiece 1 and the tension.

  Since the present invention is configured as described above, the circular groove can be easily cut by excavation, and the cutting wire for cutting the wire is formed by the groove cutting blade provided at the lower end of the cylindrical body. It can be retracted and held in the retracted position of the cylindrical body that does not interfere with the excavation until the excavation is cut, and after forming the circular groove, it is switched to wire-free by simple operation and tension is applied to the cutting wire. A tension applying device that applies sufficient tension to the cutting wire by pulling upward from the upper part can be easily disposed on the upper part of the cylindrical body. This is an epoch-making punching device capable of punching by wire cutting.

  Further, in the invention described in claim 2, the present invention can be realized by mounting the main part of the apparatus in place of the turning tool at the tool mounting part of the vertical lathe, and the revolutionary hollowing out which is extremely practical. It becomes a processing device.

  In the invention according to claim 3, the present invention can be easily realized with a simpler configuration, and a tension applying device can be disposed on the upper portion of the cylindrical body. The cutting wire lifted and disposed upward via the wire pulling locking portion provided at the location is lifted and biased, and the tension necessary for cutting is applied to the cutting wire disposed at the bottom of the circular groove. Due to the configuration, the present invention can be realized more easily with a simple configuration, and the tension for wire cutting can be stably and efficiently applied, and the wire cutting can be performed smoothly with a simple configuration. It becomes a punching machine.

  In the invention according to claim 4, when the circular groove is excavated, the cutting wire can be easily hung around the lower end of the cylindrical body and retracted and held, and the cutting wire can be easily operated. This is a punching device with even more practicality that can be realized with a simpler configuration for the wire-engaging locking portion that can be switched to the wire-free state and that can perform wire cutting by applying tension.

  Further, in the invention described in claim 5, the tension applying device can be realized with a simple configuration, and in the invention described in claim 6, similarly to the invention described in claim 3, the tension applying device is provided above the cylindrical body. The tension applying device simultaneously pulls up and urges the cutting wire disposed upward through the wire pulling engaging portions provided at two positions at the lower end of the cylindrical body, thereby forming the circular groove. The present invention more easily adopts a simple configuration because the configuration is such that the cutting wire placed around the bottom portion is applied with a tension necessary for cutting and generates a pressing force to be engulfed inwardly between the wire lifting engagement portions. In addition, the pressing force due to the tension for wire cutting can be stably and efficiently applied, and the wire punching apparatus can be performed with a simple configuration and smoothly cut the wire.

It is a schematic structure explanatory perspective view of a present Example. It is operation | movement explanatory drawing (processing procedure figure) of a present Example. It is a description perspective view before the wire cutting of a present Example. It is a description perspective view at the time of the wire cutting start of a present Example. It is an explanatory top view at the time of the wire cutting start of a present Example. It is explanatory side sectional drawing at the time of the wire cutting start after circular groove formation of a present Example. It is explanatory perspective view seen from the back surface side in the middle of the wire cutting of a present Example. It is an operation explanation perspective view showing the state where the wire for cutting is hung and held in the wire hanging latching part of this example. FIG. 9 is a perspective view for explaining the operation in a state in which the wire-engaging locking portion is half-rotated from the state of FIG. 8 of the present embodiment and the cutting wire is removed from the locking groove. FIG. 10 is a perspective view for explaining the operation in a state in which the wire-engaging locking portion is moved upward from the state shown in FIG. It is explanatory front view which shows the connection structure of the edge part of the wire for a cutting | disconnection of a present Example, and the suction hole of the advancing / retreating rod of a cylinder apparatus.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  The workpiece 1 is fixed to the turntable 5, the cylindrical body 6 that is controlled to be moved up and down with respect to the rotating workpiece 1 is lowered, and a groove cutting blade 7 provided at the lower end of the cylindrical body 6 is used to lift the bottom portion from the upper surface of the workpiece 1. The circular groove 2 having a desired depth is cut by digging.

  For example, a groove cutting blade 7 such as a groove machining tip is provided so as to project from the lower edge of the cylindrical body 6, and the cylindrical body 6 is immersed in the rotating work 1 while being cut by the groove cutting blade 7. Then, the cutting powder is sucked and discharged by utilizing the gap generated inside the cylindrical body 6.

  Compared to the conventional case where boring is performed by cutting, almost no cutting powder is generated, but the slight amount of generated powder for forming the circular groove also uses the gap generated inside the cylindrical body 6 as described above. For example, the suction pipe 18 connected to the connection hole 17 provided with the upper lid portion 16 closing the upper portion of the cylindrical body 6 can be efficiently and reliably discharged without being scattered.

  More specifically, for example, a suction hole 15 (notch hole or the like) is provided in the vicinity of the groove cutting edge 7, for example, at the lower end portion of the cylindrical body 6 at the position where the groove cutting edge 7 is vertically suspended. The scraped powder is introduced from the suction hole 15 into the gap inside the cylindrical body 6 and discharged by the suction pipe 18 on the upper side, and the cylindrical body 6 can be smoothly collected while being recovered without scattering even a small amount of the ground powder. The circular groove 2 can be cut by excavation by advancing to the bottom of the rotary workpiece 1 deeply.

  While the circular groove 2 is being excavated and cut, the cutting wire 8 is hung on a wire-engaging locking portion 10 movably provided at the lower end of the cylindrical body 6, and this cutting wire is cut. 8 is retracted and held in a retracted position that does not interfere with the excavation cutting by the groove cutting blade 7.

  The cutting wire 8 hung around the wire hanging locking portion 10 is lifted up via the wire pulling locking portion 11, and the cutting wire 8 lifted up is provided with a cylindrical body. The tension is applied to the cutting wire 8 disposed at the lower end of the cylindrical body 6 by applying the tension that causes the pulling bias by the tension applying device 9 provided on the upper portion of the cylinder 6, so that the inner side of the bottom of the circular groove 2. The cutting wire 8 is lifted upward by the amount of the bite. That is, the cutting wire 8 is configured to be urged toward the inner side of the bottom of the circular groove 2 by the upward biasing force of the cutting wire 8 and gradually bite and move in the inner horizontal direction.

  For example, it may be configured to be held around the outside of the wire-engaging locking portion 10 simply by this tension, but the locking groove 19 or the locking claw or hook may be used so that it is not further displaced or removed. A portion or the like may be provided on the wire-engaging locking portion 10.

  That is, when the cylindrical body 6 descends with respect to the rotating work 1, the cylindrical body 6 immerses into the work 1 from the upper surface of the work 1 toward the bottom by the groove cutting edge 7 provided at the lower end of the work body 1. The groove 2 is cut under digging. During this time, the cutting wire 8 is thus retracted and held in a state of being wound around the wire-engaging locking portion 10 at the lower end portion of the cylindrical body 6.

  After forming the circular groove 2 in this way, the wire-engagement locking portion 10 is retracted upward, for example, to release the wire-engagement locking of the cutting wire 8 to make the wire free. At the same time, when the cutting wire 8 is pulled up and biased by the tension applying device 9 at the upper part of the cylindrical body 6, tension is applied to the cutting wire 8 which is rotated and arranged at the bottom of the circular groove 2 in a wire-free state. By this tension, the cutting wire 8 turned to the bottom of the circular groove 2 generates a pressing force toward the inside of the bottom, and is pulled up and cut into the bottom by the pressing force due to this tension and the rotation of the work 1. Will go.

  For example, if the wire pulling lock portion 11 is provided at two locations opposite to the cylinder center of the lower end portion of the cylindrical body 6, the wire hooking lock portions 10 are wound around the wire hooking lock portions 10. When the cutting wire 8 is removed by the upward movement of the wire-engaging locking portion 10 to be in a wire-free state, the cutting wire 8 that is rotated around the bottom of the circular groove 2 is disposed at the two opposite positions. The cutting wire 8 that is simultaneously pulled up and biased upward via the wire pulling locking portion 11 and is rotated around the bottom of the circular groove 2 between the wire pulling locking portions 11 moves horizontally inward. As the cutting wire 8 is gradually pulled up, the wire cutting is completed while the wire pulling locking portion 11 is linearly formed, and tension is applied more stably and efficiently. And smooth wire cutting Performed, it is possible to form a smooth circular grooves 2 of the inner cylinder 3 hollowed to bottomed circular hole 4.

  Further, for example, the tension applying device 9 is constituted by a cylinder device 14 and controls the wire cutting to perform the wire cutting. For example, when the cutting wire 8 is hung around each wire hanging locking portion 10 and held, A pulling urging force is generated by the protruding urging force when the advancing / retreating rod 24 is protruded with a predetermined urging output, and is held around. When the wire wrapping locking portion 10 is removed and the wire is cut, the protrusion output of the advance / retreat rod 24 is further increased to a predetermined protrusion output to increase the tension due to the pulling force, and the wire cutting is performed as described above. And the control is made so that the advance / retreat rod 24 protrudes as the cutting wire 8 bites inward.

  In addition, the protruding stroke of the forward / backward rod 24 of the cylinder device 14 is restricted, or the wire is cut immediately before the cutting is completed without completely removing the tension so that the tension is weakened immediately before the cutting is completed. It is also possible to cut and remove the inside.

  Specific embodiments of the present invention will be described with reference to the drawings.

  The present embodiment is a hollowing apparatus with extremely high practicality, in which the present invention is realized by improving a vertical lathe.

  That is, in this embodiment, the circular groove 2 is excavated in the work 1, and the bottom of the circular groove 2 is wire-cut toward the inside to hollow the cylindrical body 3 to form the bottomed circular hole 4. An attachment 28 provided on the cylindrical body 6 is chucked on a chuck portion of a tool mounting portion 13 provided so as to be movable in the X, Y, and Z directions above the turntable 5 of the vertical lathe. It is configured to be installed instead.

  Groove cutting blades 7 are suspended from the lower end portion of the cylindrical body 6 at intervals. The groove cutting edge 7 is configured to protrude from the lower end edge of the cylindrical body 6 and a groove processing tip is attached to the lower end portion of the cylindrical body 6, and is fixed on the turntable 5 by a fixing tool and rotated. By lowering the cylindrical body 6 with respect to the workpiece 1, the cylindrical body 6 is immersed in the workpiece 1 while digging and cutting the circular groove 2 from the upper surface of the workpiece 1 toward the bottom of the workpiece 1. The composition is going to go.

  In the present embodiment, the lower end portion of the cylindrical body 6 near the groove cutting edge 7 is cut out from the lower end to provide a suction hole 15, from which the cutting powder is sucked and discharged, and the cutting powder generated by the groove cutting edge 7. From the suction hole 15 to the inside of the cylindrical body 6 without scattering, and from the suction pipe 18 connected to the connecting hole 17 of the upper lid portion 16 of the cylindrical body 6 through the gap generated inside the cylindrical body 6 It is configured so that the shavings are sucked and discharged, and the circular groove 2 can be smoothly excavated deeply into the bottom of the work 1.

  In the present embodiment, the cylindrical body 6 is provided with a wire cutting device 12 comprising a cutting wire 8 disposed at the bottom of the circular groove 2 and a tension applying device 9 for applying tension to the cutting wire 8. Then, the cutting wire 8 is caused to bite into the bottom portion of the circular groove 2 by the tension applied to the cutting wire 8 (pressing force to bite inward) and the rotation of the workpiece 1. The bottom is cut inward, and the cylindrical body 3 is cut out from the workpiece 1 by such wire cutting.

  As the cutting wire 8, a wire that is strong and bends freely along the circular groove 2 and that can be bent upward is used, and for example, a diamond coating wire is used to improve the cutting force.

  Further, a wire wrapping device is provided that hangs the cutting wire 8 around the lower end portion of the cylindrical body 6 so that the cutting wire 8 is retracted and held in a state that does not hinder excavation cutting by the groove cutting blade 7. The stopper portion 10 is provided movably, and a wire pulling lock portion 11 is provided at an interval to route the cutting wire 8 hung around the wire hooking lock portion 10 and arranged at intervals. The tension applying device 9 for applying a pulling tension to the cutting wire 8 lifted and arranged upward from the pulling locking portion 11 is provided on the upper portion of the cylindrical body 6, and the groove cutting blade is moved by the lowering of the cylindrical body 6. After the circular groove 2 is cut by digging, the wire-engagement locking portion 10 is moved upward to release the wire-engagement lock of the cutting wire 8 to make the wire free. The tension applying device When the cutting wire 8 that has become wire-free due to the pulling tension applied by the wire 9 is pulled upward and biased via the wire pulling locking portion 11, the cutting between the wire pulling locking portions 11 is performed. Tensile force acting as a pressing force to the inside of the bottom of the circular groove 2 is generated in the wire 8 for cutting, so that the cutting wire 8 is bitten into the inside of the bottom of the circular groove 2 and the cutting wire 8 is pulled up. The wire cutting device 12 is configured to hollow out the cylindrical body 3.

  Specifically, a plurality of the wire-engaging locking portions 10 are configured to be movable in the vertical direction at intervals in the circumferential direction of the lower end portion of the cylindrical body 6.

  Further, the wire pull-up locking portion 11 is provided at two positions opposite to the cylinder center of the lower end portion of the cylindrical body 6, and the cutting wire 8 wound around the plurality of wire hanging locking portions 10 is connected to the wire pulling locking portion 11. The cylindrical body is provided with the tension applying device 9 that is arranged to be lifted upward from the opposing two wire pulling engaging portions 11 and applies a pulling tension to the cutting wire 8 that is lifted and disposed above the cylindrical body 6. 6 is provided at the top.

  Both the wire wrapping locking portion 10 and the wire pulling locking portion 11 are provided at the lower end portion of the cylindrical body 6, but are configured not to protrude downward from the hanging lower end of the groove cutting blade 7. It is constructed so that it does not interfere with cutting by the wire, and the wire latching portion 10 is retracted so that the wire latching portion 10 is lifted upward so that the wire latching latch portion 10 is released. ing.

  That is, the wire-wrapping locking portion 10 of the present embodiment has a configuration in which a pin-shaped locking body 10 provided so as to be movable in the vertical direction is provided along the peripheral surface of the cylindrical body 6. The lower end portion of the locking body 10 is provided so as to protrude downward from the lower end edge of the cylindrical body 6, but is configured not to protrude downward from the groove cutting blade 7. The cutting wire 8 is configured to be held and retracted by applying tension by the tension applying device 9 so as to hang around the portion protruding from the lower end edge of the cylindrical body 6. By moving upward, the pin-shaped locking body 10 comes off from the cutting wire 8 and the cutting wire 8 hung around the outside of the pin-shaped locking body 10 is removed from the pin-shaped locking body 10. It is in a wire-free state that can move horizontally and move inward, and is placed around the bottom half of the circular groove 2 It is composed.

  In addition, the wire pulling locking portion 11 of the present embodiment is provided at two locations facing the cylinder center of the lower end portion of the cylindrical body 6, and the cutting is wound around the plurality of wire winding locking portions 10. The cutting wire 8 is lifted and arranged upward from the two opposing wire pulling locking portions 11, and the cutting wire 8 pulled up and arranged above the cylindrical body 6 is the cutting wire 8 at the top of the cylindrical body 6. The tension applying device 9 is configured by placing the air cylinder device 14 for pulling up and urging the upper side of the cylindrical body 6, and by applying the pulling tension by the cylinder device 14, The cutting wire 8 is simultaneously lifted and urged from both sides via the locking portion 11 so as to apply a cutting tension (inward pressing force) to the cutting wire 8 with high stability.

  Therefore, while the cylindrical body 6 is lowered with respect to the rotating work 1 as described above and the circular groove 2 is dug and cut from the upper surface to the bottom of the work 1, the cutting wire 8 is cut. Is hanged around a wire wrapping locking portion 10 movably provided at the lower end portion of the cylindrical body 6, and the cutting wire 8 is moved to a retracted position that does not hinder digging cutting by the groove cutting blade 7. After retracting and holding and forming the circular groove 2, the wire-engaging locking portion 10 is moved upward to release the wire for cutting 8 and to be in a wire-free state. A cutting wire disposed around a half circumference of the bottom of the circular groove 2 which has become a wire-free state by applying a pulling tension to the cutting wire 8 on the cylindrical body 6 by a tension applying device 9 on the cylindrical body 6. 8 is the wire pulling locking portion 11 As a result of being pulled upward and biased, tension is applied to the cutting wire 8 turned to the bottom of the circular groove 2 at the lower end of the cylindrical body 6 to generate a pressing force in the inner horizontal direction. The cutting wire 8 between the wire pull-up locking portions 11 bites into the inside of the bottom of the circular groove 2 due to the pressing force due to the tension and the rotation of the work 1, and the cutting wire 8 is gradually lifted and cut accordingly. Will go.

  Specifically, a connecting portion 25 is provided at the tip of the advance / retreat rod 24 of the cylinder device 14, and the cutting wire 8 is connected to the connecting portion 25. That is, it is arranged to be lifted upward along the outer periphery of the cylindrical body 6 via the wire lifting locking portion 11 and further to the cylinder via the horizontal erection locking portions 26 provided at two positions opposite to the upper portion of the cylindrical body 6. An end portion of the cutting wire 8 disposed in the upper horizontal direction of the body 6 is connected to the connecting portion 25.

  Accordingly, by projecting the advancing / retreating rod 24 of the cylinder device 14 laid horizontally on the upper part of the cylindrical body 6, the connecting portion 25 at the tip portion protrudes and the cutting wire 8 connected to the end portion thereof pulls. Then, tension is applied to the cutting wire 8 at the bottom, that is, the cutting wire 8 between the wire lifting engagement portions 11, and the cutting wire 8 at the bottom of the circular groove 2 is formed between the wire lifting engagement portions 11. It will go inside and move.

  In other words, the cylinder device 14 is controlled to generate a predetermined projecting output so that the cylinder device 14 projects a predetermined length, so that the cylinder device 14 is routed to the bottom of the circular groove 2 via the horizontal laying locking portion 26 and the wire lifting locking portion 11. Tension is applied to the provided cutting wire 8, and a pressing force (moving force) in the inner horizontal direction is generated between the wire pulling locking portions 11, and the wire cutting is performed by the pressing force and the rotation of the workpiece 1. At the same time, the advancing / retreating rod 24 of the cylinder device 14 protrudes and the cutting wire 8 is pulled up by the amount of biting.

  Further, the connection between the connecting portion 25 at the distal end of the advance / retreat rod 24 and the cutting wire 8 adopts a configuration such as that used in a stringed instrument, for example, and is attached to the mounting pin 22 that is rotatably fixed. The ends of the cutting wire 8 are wound and connected to each other, and the tension can be finely adjusted by adjusting and rotating the mounting pin 22 with the rotating operation unit 23.

  In addition, the wire-wrapping locking portion 10 of the present embodiment is a pin-shaped locking body 10 that is arranged so as to be movable up and down along the cylindrical body 6 so as to protrude from the lower end edge as described above. However, the cutting wire 8 hung around the outer surface of the pin-shaped locking body 10 is lifted and biased by the tension applying device 9 provided on the upper portion of the cylindrical body 6 via the wire lifting locking portion 11. The cutting wire 8 is latched and held (pressed) by the tension generated by the above. Further, in this embodiment, the surface of the pin-like locking body 10 is cut to a predetermined height so that the hooking and holding around the pin-like locking body 10 is securely held without shifting up and down. The locking groove 19 for locking the wire 8 is recessed, and this locking groove 19 is not formed on the entire circumference of the predetermined height but is formed on a part of the outer side so that the pin-shaped locking body 10 is formed. For example, the cutting wire 8 is configured to be detached from the locking groove 19 by a half rotation, and the pin-shaped locking body 10 is moved halfway in this way and then moved upward to ensure engagement. The cutting wire 8 that has been stopped and held smoothly disengages from the pin-like locking body 10, and the cutting wire 8 becomes in a wire-free state and can move horizontally inward so that it can be moved directly inside the bottom of the circular groove 2 by the tension. It is constructed so that it can be pressed, and further by the increase in the pulling force by the tension applying device 9 The wire cutting as described above is performed by the increased tension and the rotation of the workpiece 1.

  Further, as described above, the wire-lifting locking portion 11 is provided at two positions opposite to the cylinder center of the lower end portion of the cylindrical body 6, and the wire pulling-up / down-moving portion 10 is moved upward and downward to move the wire. The cutting wire 8 which is in a free state and is rotated around the bottom half circumference of the circular groove 2 is simultaneously lifted and biased upward through the two opposing wire pulling locking portions 11 and is necessary for cutting. The tension is applied by the tension applying device 9 at the upper part of the cylindrical body 6, and the wire pulling locking portion 11 is 90 degrees upward through the cutting wire 8 at the lower end of the cylindrical body 6. A locking metal fitting having a through hole 27 that is bent and pulled up so as to be bent is provided, and the cutting wire 8 that is arranged around the bottom half circumference of the circular groove 2 through the cutting wire 8 is passed through the through hole 27. For both wire pulling The cutting wire 8 is arranged so as to be pulled upward from the stopper 11 along the outer periphery of the cylindrical body 6, and the pulled cutting wire 8 is passed through a through hole 27 provided in the horizontal laying locking portion 26, and further bent 90 degrees. The end portion of the cutting wire 8 is connected to the connecting portion 25 at the front end portion of the forward / backward rod 24 of one cylinder device 14.

  Therefore, by controlling the projecting output of one cylinder device 14, the cutting wires 8 on both sides are lifted and urged in a balanced manner via the wire pulling locking portions 11 on both sides. The tension can be applied to the cutting wire 8 in a well-balanced manner so that the cutting wire 8 can be smoothly entrapped inwardly between the wire-lifting locking portions 11, and the wire cutting can be performed stably and efficiently. It will be possible.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

DESCRIPTION OF SYMBOLS 1 Work 2 Circular groove 3 Cylindrical body 4 Bottomed circular hole 5 Turntable 6 Cylindrical body 7 Groove cutting edge 8 Cutting wire 9 Tension applying device
10 Wire hooking latch
11 Wire pulling latch
12 Wire cutting device
13 Tool mounting
14 Cylinder device

Claims (6)

  A hollow machining apparatus for excavating a circular groove in a workpiece and cutting the bottom of the circular groove inward to hollow out a cylindrical body to form a bottomed circular hole, above the turntable for fixing the workpiece A cylindrical body is provided so as to be movable up and down, a groove cutting blade is provided at the lower end of the cylindrical body, and the cylindrical body is lowered with respect to the work rotating on the turntable, so that it can be removed from the upper surface of the work. The circular groove is cut under the work toward the bottom of the workpiece, and the cylindrical body includes a cutting wire disposed at the bottom of the circular groove and a tension applying device that applies tension to the cutting wire. A wire cutting device is provided, and the cutting wire is bitten into the bottom of the circular groove by the tension applied to the cutting wire and the rotation of the work, and the bottom of the circular groove is cut inward. Before work The cylindrical body is configured to be hollowed out by wire cutting, and the cutting wire is wound around the lower end portion of the cylindrical body, and the cutting wire is retracted and held in a state that does not interfere with the excavation cutting by the groove cutting blade. A wire-hanging latching portion is provided to be movable, and a wire-lifting latching portion is provided for routing the cutting wire hung around the wire-engaging latching portion upward. The tension applying device for applying tension to the cutting wire lifted and arranged upward from the pulling locking portion is provided on the upper portion of the cylindrical body, and the circular groove by the groove cutting blade is dug by lowering the cylindrical body. After undercutting, the wire-engaging locking portion is moved to release the wire-holding state of the cutting wire so that the wire is free, and the tension is applied by the tension applying device. The wire for cutting in a wire-free state is pulled upward through the wire pulling engagement portion, so that the cutting wire is bitten into the bottom of the circular groove and the cylindrical body is hollowed out. A punching device comprising the wire cutting device.   The tool mounting portion that is controlled to move above the turntable of the vertical lathe includes the groove cutting blade, the cutting wire, the wire wrapping locking portion, the wire pulling locking portion, and the tension applying device. The hollow machining apparatus according to claim 1, wherein the cylindrical body provided with the wire cutting device is mounted.   A plurality of the wire-engaging locking portions are configured to be movable at intervals in the circumferential direction of the lower end portion of the cylindrical body, and the wire lifting locking portion faces the cylinder center of the lower end portion of the cylindrical body. The cutting wire, which is provided at two places and is held around the plurality of wire-engaging locking portions, is pulled upward from the two opposite wire-lifting locking portions, and is disposed above the cylindrical body. The hollow machining apparatus according to any one of claims 1 and 2, wherein the tension applying device for applying a pulling tension to the cutting wire arranged to be pulled up is provided on an upper portion of the cylindrical body.   The wire wrapping locking portion is formed of a locking body provided so as to be movable in the vertical direction, and the wire wrapping locking portion is moved upward by moving the wire wrapping locking portion upward. The circular groove enters the wire-free state in which the cutting wire that has been pulled out and pulled out to the outside of the wire-engaging latching portion is released from the wire-engaging latching portion and can be moved horizontally inward. And is urged upward by the tension applying device via the wire pulling engagement portion provided at an interval to form a circular groove between the wire pulling engagement portions. The hollow machining apparatus according to any one of claims 1 to 3, wherein a pressing force to the inside of the bottom portion is generated.   The tension applying device is constituted by a cylinder device that applies tension for pulling and urging the cutting wire disposed above the cylindrical body, and the circular wire bottom is lifted by the cylinder device. The hollow machining apparatus according to any one of claims 1 to 4, wherein a tension necessary for cutting the wire that causes the cutting wire disposed in the inside to bite into the inside is applied.   The wire pull-up locking portions are provided at two locations facing the cylinder center of the lower end portion of the cylindrical body, and the cutting wires hooked and locked by the plurality of wire routing locking portions are placed at the two opposing locations. The above-mentioned cylinder device is installed on the upper part of the cylindrical body, and is disposed above the cylindrical body, and is arranged to be pulled upward from each of the wire-lifting locking portions, and simultaneously pulling up and urging the cutting wires disposed above the cylindrical body. A tension applying device is configured, and this cylinder device simultaneously pulls up and urges the cutting wire from both sides via the two wire pulling engaging portions to enter the wire free state and pull the wire. The cutting wire, which is arranged so as to be movably turned inside the bottom of the circular groove between the engaging portions, is given a tension that generates an inward pressing force necessary for cutting, and this tension and the rotation of the workpiece are applied. Ri punching device in according to claim 5, characterized by being configured to perform the wire cut.

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