JP2010228093A - Rotary cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary cutting tool having a chip scattering preventive means for preventing scattering of chips cut by a cutting tool. <P>SOLUTION: This rotary cutting tool attachable-detachable to a punch press, has a rotary shaft 47 rotated by driving a hydraulic motor 35, in a cylindrical holder 59 installed in a cope holder 5 in the punch press, and has a tool holding means 55 capable of attaching-detaching a cutting tool 57, in a tip part of this rotary shaft 47, and has a chip scattering preventive means 63 for preventing scattering of the chips cut by the cutting tool 57 to the periphery. The chip scattering preventive means 63 is constituted of a brush or bellows or a spatula member annularly arranged by surrounding the cutting tool 57. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotary cutting tool used by being mounted on a punch press such as a turret punch press.

  In a punch press such as a turret punch press, a main process is punching a plate-shaped workpiece. However, for example, in order to improve the accuracy of holes after punching, or to perform various cutting processes such as tapping the holes after punching, rotary cutting is used by attaching to a punch press. A tool has been proposed (see, for example, Patent Documents 1 and 2).

US Pat. No. 5,259,100 JP-A-6-155202

  In the invention described in Patent Document 1, a rotary cutting tool mounted on an upper turret in a turret punch press is pressed down by a striker (ram) provided on the turret punch press so as to be movable up and down. The rotating shaft provided in the rotary cutting tool is rotated by supplying a working fluid to the provided fluid pressure motor and rotating it. That is, the rotating shaft is rotated by a fluid pressure motor, and the cutting tool attached to the rotating shaft is merely rotated. For example, there is a problem in cooling the cutting tool and extending the tool life. .

  In the invention described in Patent Document 2, the rotating shaft provided in the rotary cutting tool is rotated by the electric motor, and the oil mist used for cooling the electric motor is guided to the cutting tool to cool the cutting tool. It is. Therefore, although the cutting tool can be cooled, there is a problem that the wiring configuration of the electric system for driving the transmission motor becomes complicated.

  The present invention has been made in view of the above-described problems, and is a rotary cutting tool that can be attached to and detached from a punch press, in which a fluid pressure is placed in a cylindrical holder that is attached to an upper mold holder in the punch press. A rotating shaft that is rotated by driving a motor is provided, and a tool holding means that can attach and detach a cutting tool is provided at the tip of the rotating shaft, so that chips cut by the cutting tool are prevented from being scattered around. Therefore, it is provided with means for preventing chips from scattering.

  Further, in the rotary cutting tool, the chip scattering preventing means is constituted by a brush, a bellows, or a spatula member arranged in an annular shape surrounding the cutting tool.

  According to the present invention, it is possible to extend the life of a rotary cutting tool used by being mounted on a punch press.

It is a section explanatory view of the rotary cutting tool concerning the embodiment of the present invention. It is sectional explanatory drawing which illustrated only the principal part which concerns on 2nd Embodiment of a rotary cutting tool. It is explanatory drawing which showed roughly the whole structure of the turret punch press as an example of a punch press.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. In order to facilitate understanding, an overall configuration of a turret punch press as an example of a punch press will be schematically and conceptually described.

  Referring to FIG. 3, a turret punch press 1 as an example of a punch press is rotatably provided with an upper turret as an upper mold holder 5 that supports a plurality of punches 3, and a plurality of turret punch presses 1 that face the punches 3. A lower turret as a lower mold holder 9 that supports the die 7 is rotatably provided. Further, the turret punch press 1 is a workpiece movement positioning means 11 capable of moving and positioning a plate-like workpiece W processed by the punch 3 and the die 7 in the X and Y axis directions with respect to the processing position by the punch 3 and the die 7. It has.

  Further, the punch press 1 is provided with a ram vertical movement actuator 15 such as a fluid pressure cylinder or a bow screw mechanism for moving the striker 13 up and down freely that can strike the punch 3 that is indexed and positioned at the processing position. . The striker 13 is connected to a fluid pressure source 19 such as an air source via a connection path 17, and the oil tank is sucked into the connection path 17 so as to suck oil in the oil tank 20. An ejector 22 connected to 20 is arranged.

  In addition, since a punch press like the said structure is well-known, more detailed description of a punch press is abbreviate | omitted.

  The rotary cutting tool according to the present invention is used by being mounted on the upper holder 5 in the same manner as the punch 3 and is configured as follows.

  Referring to FIG. 1, the rotary cutting tool 21 according to the present embodiment is supported so as to be attachable / detachable and movable up and down in an upper mold mounting hole 23 formed in the upper mold holder 5 in the same manner as the punch 3. Yes. That is, support pieces 25 for supporting the rotary cutting tool 21 are provided at a plurality of locations around the upper mold mounting hole 23 so as to be movable up and down. Each support piece 25 is always moved upward by a lifter spring 27. Is being energized. Since the support piece 25 and the lifter spring 27 have a well-known configuration, a detailed description of the configuration and operation is omitted.

  The rotary cutting tool 21 includes a cylindrical holder 29 that can be attached to and detached from the upper mold mounting hole 23. The holder 29 has a configuration in which a cylindrical upper holder 29U and a lower holder 29L are integrally connected by a connecting tool 31, and the connecting tool 31 is supported by the support piece 25. More specifically, the connector 31 is formed of a nut member that is fitted to the lower holder 29L so as to be rotatable and cannot be pulled upward. The lower end of the upper holder 29U is connected to the nut member. Are screwed together.

  A head member 33 that is pushed downward by the striker 13 in the punch press 1 is provided on the upper portion of the upper holder 29U in the rotary cutting tool 21 so as to be movable up and down. That is, the fluid pressure motor 35 such as an air motor fitted in the upper holder 29U so as to be movable up and down and the head member 33 are integrally connected. An elastic means 37 such as a coil spring is interposed between the head member 33 and the upper holder 29U, and the head member 33 is always urged upward. However, the raised position of the head member 33 is limited by a regulating member 39 such as a guide bolt.

  The head member 33 is provided with a fluid inlet 41 that can be connected to the fluid supply hole 13H provided in the striker 13, and the fluid inlet 41 is provided with a seal member 43 such as an O-ring. The head member 33 is formed with a fluid passage 45 extending from the fluid inlet 41 to the fluid pressure motor 35.

  The fluid pressure motor 35 is rotatably provided with a rotating shaft 47 that is rotated by receiving a supply of a working fluid such as compressed air, like a normal air motor. Further, the fluid pressure motor 35 is integrally connected with an upper end portion of a sleeve 49 fitted in the lower holder 29L so as to be movable up and down, and a bearing 51 such as a ball bearing is inserted into the sleeve 49. An upper end portion of the rotary sleeve 53 that is rotatably supported and the rotary shaft 47 are connected via a connecting pin 55 so as to rotate integrally.

  Since the rotary sleeve 53 is connected to the rotary shaft 47 so as to rotate integrally, the rotary sleeve 53 can be regarded as a part of the rotary shaft 47. A chuck 55 such as a collet chuck is attached to the lower end of the rotating sleeve 53 as an example of a tool holding means. Therefore, an appropriate cutting tool 57 such as a reamer or an end mill can be attached to and detached from the rotary cutting tool 21.

  A ring-shaped cap member 59 is detachably attached to a lower end portion of the lower holder 29L through a fixture 61 such as a bolt so as to surround the cutting tool 27. On the lower surface of the cap member 59, chip scattering preventing means 63 for preventing the chips cut by the cutting tool 57 from scattering to the surroundings is provided. As the chip scattering preventing means 63, various configurations such as a configuration in which a brush is arranged in an annular shape so as to surround the cutting tool 57, a configuration in which an annular bellows or an annular spatula member is provided, and the like are adopted. Can do.

  The working fluid supplied to the fluid pressure motor 35 rotates the rotating shaft 47 of the fluid pressure motor 35 and then enters the annular fluid passage 65 between the fluid pressure motor 35 and the inner peripheral surface of the upper holder 29U. It is the composition which is discharged. The upper side of the fluid passage 65 is closed by a seal member 67 such as an O-ring. The lower side of the fluid passage 65 communicates with a radial through hole 69 provided in the sleeve 49. That is, the fluid discharged from the fluid pressure motor 35 is guided from the fluid passage 65 through the through hole 69 to the position of the cutting tool 57 held by the chuck 55 through the bearing 51 in the sleeve 49. It is constituted as follows.

  A workpiece support member 71 that supports the workpiece W when the workpiece W is cut by the rotary cutting tool 21 is detachably mounted on the lower mold holder 9 so as to face the rotary cutting tool 21. That is, the outer shape of the work support member 71 is the same as that of the die 7 and is detachably mounted in a die mounting hole provided in the lower mold holder 9.

  A relatively large opening 73 into which the lower end of the cutting tool 57 can enter when the workpiece W is cut is formed in the upper part of the work support member 71, and an opening is formed below the opening 73. A discharge hole 75 having a smaller sectional area (smaller diameter) than the sectional area of the portion 73 is formed. A small-diameter outside air suction hole 76 is inclined and communicated with the discharge hole 75 so as to be directed in the discharge direction (downward direction).

  At a plurality of locations on the upper surface of the work support member 71, there are provided projecting support members 77 made of a rotatable ball or brush for supporting the work W in a state of slightly floating from the upper surface of the work support member 71. ing. Further, an auxiliary block 81 having a hole 79 having substantially the same diameter as the discharge hole 75 is attached to the lower surface of the work support member 77. Note that a suction device (not shown) for making the inside of the opening 73, the discharge hole 75, and the hole 79 of the work support member 71 negative pressure is disposed below the lower mold holder 9.

  In the configuration as described above, in the state where the rotary cutting tool 21 is indexed and positioned at the lower position of the striker 13, the ram vertical movement actuator 15 is operated to lower the striker 13, and the striker 13 is moved to the head member of the rotary cutting tool 21. When the compressed air is supplied from the fluid pressure source 19 to the striker 13, the oil in the oil tank 20 is sucked and supplied to the striker 13 as oil mist. When the oil mist (working fluid) is supplied from the fluid supply hole 13H of the striker 13 to the fluid pressure motor 35 of the rotary cutting tool 21, the rotary shaft 47 of the fluid pressure motor 35 is rotated and the cutting tool 57 is rotated. .

  As described above, when the striker 13 is further lowered after the striker 13 comes into contact with the head member 33 of the rotary cutting tool 21, first, the entire rotary cutting tool 21 is lowered against the urging force of the lifter spring 27. When the cutting tool 57 corresponds to the position where the workpiece W is to be cut and the chip scattering prevention means 67 made of a brush or the like comes into contact with the upper surface of the workpiece W and is pressed against the upper surface of the workpiece W, the holder 29 is lowered. Is stopped, and the head member 33 is relatively lowered against the urging force of the elastic means 37.

  When the head member 33 is lowered relative to the holder 29 as described above, the cutting tool 57 is lowered integrally, and the lower end portion of the cutting tool 57 enters the opening 73 of the work support member 71. It becomes like this. In this way, when the cutting tool 57 is lowered, the workpiece W is moved in the X and Y directions with respect to the cutting tool 57 by the workpiece movement positioning means 11 provided in the punch press 1. The nibbed contour portion can be cut (cut by an end mill), and the processed surface can be processed with higher accuracy. In addition, when using a reamer as a cutting tool, the inner surface of the hole processed by the punch 3 can be processed with high accuracy.

  As described above, when the workpiece W is cut by the cutting tool 57, the striker 13 is moved up and down by the ram up-and-down actuator 15, and the cutting tool 57 is moved up and down to perform cutting. For example, in the case of an end mill, the entire blade portion of the cutting tool 57 contributes to cutting, and only a part can be prevented from being worn. Therefore, the life of the cutting tool 57 can be extended.

  Further, as described above, when the workpiece W is cut by the cutting tool 57, the working fluid such as oil mist discharged from the fluid pressure motor 35 passes through the portion of the bearing 51 from the fluid passage 65 to the cutting tool 57. Therefore, the bearing 51 is lubricated and cooled, and the cutting tool 57 is cooled. Therefore, the life of the bearing 51 and the cutting tool 57 can be extended.

  Further, the chips generated by the cutting of the cutting tool 57 are prevented from being scattered to the surroundings by the chip scattering preventing means 63, and the suction force by the suction means acts on the opening 73 in the work support member 71. As a result, the chips are sucked and removed, so that scattering around the chips is effectively prevented. The work support member 71 is provided with an outside air suction hole 76 communicating with the discharge hole 75 so as to be inclined, so that the chips in the discharge hole 75 are effectively discharged and the opening portion is provided. Even when 73 is closed, the air sucked from the outside air suction hole 76 can secure the flow of fluid in the discharge direction in the discharge hole 75, and clogging occurs. There is no.

  FIG. 2 shows a second embodiment. In the second embodiment, a branch path 83 branched from the fluid inlet 41 provided in the head member 33 is formed, and a part of the fluid is guided to the cutting tool 57 side through the branch path 83. Is. Although the branch path 83 is illustrated as passing through a regulating member 39 such as a bolt, the branch path 83 may be any path as long as it avoids the fluid pressure motor 35. is there. Also in the above configuration, the bearing 51 and the cutting tool 57 can be cooled in the same manner as described above, and the same effect can be obtained.

  Further, in the second embodiment, a throttle adjusting valve 85 such as a needle valve is provided as an example of a flow control means in the middle of the fluid passage 45 extending from the fluid inlet 41 to the fluid pressure motor 35. Yes. Therefore, the flow rate of the working fluid supplied to the fluid pressure motor 35 can be controlled by adjusting the throttle adjusting valve 85. Therefore, the rotational speed of the fluid pressure motor 35 can be adjusted by the material of the workpiece W, the material and diameter of the cutting tool 57, and the cutting conditions can always be set appropriately.

  The present invention is not limited to the above-described embodiment, and can be implemented in other embodiments by making various modifications. In other words, it is also possible to configure the fluid passage for the working fluid supplied to the fluid pressure motor 35 and the fluid passage for guiding the fluid to the bearing and cutting tool separately in advance and to allow the working fluid to flow separately. . It is also possible to separate the fluid passage to the bearing and the fluid passage to the cutting tool. That is, the present invention can be implemented with various modifications.

1 Turret punch press 5 Upper holder (upper turret)
9 Lower mold holder (lower turret)
DESCRIPTION OF SYMBOLS 11 Work movement positioning means 13 Striker 13H Fluid supply hole 15 Actuator for vertical movement of ram 21 Rotary cutting tool 29 Holder 29U Upper holder 29L Lower holder 33 Head member 35 Fluid pressure motor 41 Fluid inlet 45 Fluid passage 47 Rotating shaft 51 Bearing 55 Chuck 57 Cutting Tool 63 Chip scattering prevention means 65 Fluid passage 71 Work support member 73 Opening portion 75 Discharge hole 76 Outside air suction hole 79 Hole 83 Branch path 85 Restriction adjusting valve

Claims (2)

  A rotary cutting tool that can be attached to and detached from a punch press, and is provided with a rotary shaft that is rotated by driving of a fluid pressure motor in a cylindrical holder that is attached to an upper mold holder in the punch press. A tool holding means to which the cutting tool can be attached and detached is provided at the tip portion, and chip scattering prevention means for preventing the chips cut by the cutting tool from being scattered around is provided. Rotary cutting tool.   2. The rotary cutting tool according to claim 1, wherein the chip scattering preventing means is configured by a brush, a bellows, or a spatula member arranged in an annular shape surrounding the cutting tool. tool.

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