JP5385573B2 - Tap die - Google Patents

Description

  The present invention relates to a tap die used in cooperation with a tap die that is used by being mounted on a punch press such as a turret punch press, and more specifically, discharge of chips generated during tapping. It is related with the tap die which can aim at improvement of.

For example, in a punch press such as a turret punch press, a small diameter pilot hole is punched into a plate-shaped workpiece, and a tapping process may be performed directly or after burring the pilot hole. Therefore, the punch press is provided with a tap mold that can rotate and move up and down the tap for tapping, and the tap mold is provided at a lower position in cooperation with the tap mold. The tap die is used (see, for example, Patent Document 1).
JP 2004-268247 A

  The tap die described in Patent Document 1 has a configuration as shown in FIG. That is, the tap die 105 used in cooperation with the tap mold 103 mounted on the punch holder 101 such as an upper turret in a turret punch press is attached to and removed from a die holder 107 such as a lower turret in a punch press. It is provided freely. The tap die 105 includes a cylindrical die body 109, and a tap that is pressed downward by a tap 111 that is rotatably and vertically movable on the tap die 103. An inner cylinder 115 having an abutting member 113 at the top is provided to be movable up and down.

  The inner cylinder 115 is always urged upward by a coil spring 117, and the upper surface of the inner cylinder 115 is in contact with the lower surface of an inner flange 109F provided at the upper portion of the die body 109. Further, a circumferential groove 121 is formed on the outer peripheral surface of the inner cylinder 115 so as to be able to communicate with and cut off from the air supply port 119 provided in the die main body 109. The circumferential groove 121 communicates with the inside of the inner cylinder 115. It is.

  The air supply port 119 of the die body 109 and the air source 123 are connected via a connection path 125, and the air supply port 119 and the circumferential groove 121 are in communication with the connection path 125. Or the pressure switch 127 for detecting whether it is in the cutoff state is connected.

  Therefore, after positioning the prepared hole WH processed into the workpiece W on the die body 109 in the tap die 105, the tap die 103 is lowered by a ram (striker) provided to the punch press so as to be movable up and down, and the workpiece W is moved to the above-described position. Tapping is performed on the pilot hole WH of the workpiece W by pressing and fixing to the die body 109 and lowering and rotating the tap 111 relatively.

  When the lower end portion (tip portion) of the tap 111 comes into contact with the tap contact member 113 and descends the inner cylinder 115 against the urging force of the coil spring 117, the air supply port 119 and the circumferential groove 121 are connected. Is done. Therefore, when the air supply port 119 in the shut-off state is connected to the circumferential groove 121, the air pressure in the connection path 125 changes from high pressure to low pressure, and this change in air pressure is detected by the pressure switch 127. be able to. Therefore, by detecting whether the pressure switch 127 repeats the ON-OFF-ON operation when the tap 111 rises again after being lowered from the raised position to the lowest lowered position, for example, the tap 111 is broken or the like. Can be detected.

  However, in the above configuration, the tap mold 103 attached to the punch holder 101 in the punch press is mistakenly replaced with the tap mold 103 having the small diameter tap 111 instead of the tap mold 103 having the small diameter tap 111. Since the stroke length of a large-diameter tap having a large screw pitch becomes large even if the number of tap rotations is the same, for example, after the inner cylinder 115 reaches the descending end, the tap further moves into the inner cylinder 115. There is a problem that the tap may be broken or the tap mold may be damaged.

  Further, in the conventional configuration as described above, long chips generated during the tapping process are wound around the tap contact member, or a part of the chips is formed on the upper surface of the inner cylinder 115 and the inner flange 109F of the die body 109. There are problems such as getting in between.

The present invention has been made in view of the conventional problems as described above, and is a tap die used in cooperation with a tap die used by being mounted on a punch press, in a cylindrical die body. An inner cylinder provided with a tap abutting member pressed downward by a tap provided on the tap die so as to be movable up and down, and urged upward, provided with an upper end portion of the cylindrical substantially the same height as the upper end of the die body, constituted by a plate material having the same thickness of the tap contact member over the entire length, both ends of the tap contact member, the A long helical chip that is attached to the inner cylinder at a position corresponding to a radial recess provided on the upper surface of the inner cylinder, and the vertical dimension of the tap contact member is generated by tapping. Wrap around Tare formed to the width of ten times several times a thickness to stop is, the lower end of the tap contact member is provided in an upper position than the air injection hole provided in the inner tube It is characterized by this.

  According to the present invention, it is possible to prevent swarf from wrapping around the tap contact member and to prevent swarf from entering between the die body and the inner cylinder. Can be eliminated.

  Hereinafter, as will be described with reference to the drawings, the tap mold used by being attached to the punch press may be a tap mold described in Patent Document 1, for example. The tap die used in cooperation with the tap mold will be described in detail.

  1 to 4, a tap die 1 according to an embodiment of the present invention has a cylindrical shape that is detachably attached to a die holder (not shown) in a punch press, like a general tap die. A die body 3 is provided. The die body 3 includes an inner cylinder 7 provided with a tap contact member 5 that is pressed downward by a tap 111 that is rotatably and vertically movable on a tap mold 103 (see FIG. 7). Can be moved up and down and urged upward.

  More specifically, the die body 3 is mounted in a die mounting hole (not shown) provided in the die holder so as to be detachable and replaceable while holding a minute gap. A circumferential groove 9 corresponding to a communication port (not shown) communicating with the die mounting hole is formed, and the die body 3 communicates with the circumferential groove 9 at a plurality of locations and penetrates inward. An air supply port 11 is formed. The communication port is connected to an air source (not shown) via a connection path (not shown), and this connection path includes a flow switch as an example of a fluid sensor for detecting the presence or absence of air flow. (Not shown) is provided.

  The flow switch is turned on when a large amount of air is flowing in the connection path, and is turned off when a large amount of air is not flowing in the connection path. It should be noted that a small amount of air flowing out from the minute gap between the die mounting hole and the die body 3 is provided so as not to be turned on. Therefore, it is possible to detect whether a large amount of air is flowing through the connection path by the ON / OFF operation of the flow switch. Since the flow switch may have a known configuration, a detailed description of the configuration of the flow switch is omitted.

  The outer diameter of the inner cylinder 7 provided in the die body 3 so as to freely move up and down is to prevent the chips from entering (entering) between the die body 3 and the inner cylinder 7. 3 and the upper part of the die body 3 are formed substantially equal to the inner diameter of a presser ring 15 which is detachably attached via a fixing tool 13 such as a bolt. That is, the clearance between the die main body 3 and the pressing ring 15 and the inner cylinder 7 is formed as a minute clearance that does not allow chips to enter. The upper end (upper surface) 7U of the inner cylinder 7 in the normal state is substantially coincident with the upper end (upper surface) 15U of the presser ring 15.

  In order to constantly urge the inner cylinder 7 upward with respect to the die body 3, between the rotation prevention keys 17 provided at a plurality of locations of the inner cylinder 7 and the bottom of the die body 3, for example, An elastic member 19 (see FIG. 4B) such as a coil spring is mounted. The detent key 17 abuts against the lower surface of the presser ring 15 to prevent the retainer key 17 from coming off upward.

  The tap contact member 5 is made of a plate material that is long in a direction (radial direction) orthogonal to the axis of the inner cylinder 7, and is attached to the upper end side of the inner cylinder 7. More specifically, the tap contact member 5 is in a state in which protruding portions at both ends are engaged with a radial engagement groove 21 formed in the upper portion of the inner cylinder 7, and the inner cylinder 7 is threaded in the radial direction. It is detachably attached by a combined set screw 23.

  The upper surface 5U of the tap contact member 5 is provided lower than the upper end portion 7U of the inner cylinder 7, and the upper surface 5U is provided in the thickness direction of the tap contact member 5 in order to make it easier to remove chips. It is formed in the curved surface where both sides become low. And the width dimension of the up-down direction of the said tap contact member 5 is provided larger than the thickness dimension, in order to prevent winding of a chip. More specifically, the vertical width dimension of the tap contact member 5 is thick in order to prevent wrapping or entanglement of long helical chips generated by tapping with a tap provided in the tap mold. It is provided in a size several to ten times the length.

  On the outer peripheral surface of the inner cylinder 7, communication portions 25 </ b> A and 25 </ b> B that can communicate with the air supply port 11 provided in the die body 3 are provided in a plurality of stages. More specifically, a concave portion 25 that is long in the vertical direction is formed on the outer peripheral surface of the inner cylinder 7 corresponding to the air supply port 11. By providing the land portion 25C, one side portion of the concave portion 25 is divided into the upper communication portion 25A and the lower communication portion 25B. An air ejection hole 27 (see FIG. 4A) provided in the inner peripheral surface of the inner cylinder 7 so as to be directed downward is provided in communication with the recess 25.

  With the above configuration, even if the communication portions 25A and 25B are configured vertically, the air jet 27 is common because of the configuration provided on one side of the recess 25, and the configuration is simplified. Can be achieved.

  In the above configuration, in the state where the tap die 1 is mounted in the die mounting hole of the die holder provided in the punch press, the inner cylinder 7 is raised by the urging force of the elastic member 19 as shown in FIGS. The upper end portion (upper surface) 7U of the inner cylinder 7 is substantially coincident with the upper end portion of the die body 3, that is, the upper end portion (upper surface) 15U of the presser ring 15. As shown in FIG. 3, the air supply port 11 provided in the die main body 3 is in a state where it communicates with the lower communication portion 25 </ b> B formed in the outer peripheral surface of the inner cylinder 7.

  Therefore, the air supplied from the air source is jetted in the downward direction in the inner cylinder 7 from the air ejection hole 27 provided in the inner cylinder 7, and sucks air from the upper part of the inner cylinder 7 into the inner cylinder 7. This will produce an effect. Moreover, the flow switch as a fluid sensor provided in the connection path connected to the air source is in the ON operation state.

  As described above, a ram (striker) provided in a punch press for positioning a pilot hole of a workpiece on the tap die 1 and performing tapping processing on the pilot hole when the inner cylinder 7 is in the highest position. The tap mold is lowered to a predetermined height position by this, and the work is pressed and fixed to the upper surface of the presser ring 15 in the tap die 1 by this tap mold, or the tap mold is held slightly separated from the work. Then, by tapping and lowering the tap provided in the tap mold, tapping is performed on the prepared hole of the work by the tap as in the conventional general tap mold.

  As described above, when tapping is performed on the prepared hole of the workpiece, if the lower end of the tap 111 comes into contact with the tap contact member 5, as shown in FIGS. 6, the work is omitted), and the inner cylinder 7 is gradually lowered against the urging force of the elastic member 19. And the communication state of the lower side communication part 25B formed in the outer peripheral surface of the inner cylinder 7 and the air supply port 11 with which the die main body 3 was equipped will be interrupted | blocked gradually. That is, the air supply port 11 is blocked from communication corresponding to the land portion 25C.

  As described above, the air supply port 11 provided in the die body 3 is in a state corresponding to the land portion 25C of the inner cylinder 7, and the air supply port 11 is disconnected from the communication corresponding to the land portion 25C. When in the state, the ram provided to the punch press so as to be movable up and down is in a state of being lowered to a preset lowering position, and the tap provided in the tapping mold is rotated by the set number of rotations, This is a time when the rotation speed and the tap pitch are lowered from the predetermined height position by a specified stroke length. That is, this is when the tap 111 and the inner cylinder 7 are moved down with the stroke length defined in advance. After the tap 111 is lowered in this way, the tap 111 is reversely rotated and the ram is lifted to complete the tapping process on the prepared hole of the workpiece.

  Therefore, when the tap 111 changes from normal rotation to reverse rotation and rises from the lowest position, when the flow switch as the fluid sensor performs ON-OFF-ON operation, normal tapping is performed. It can be detected as an object. Here, even though the tap 111 is rotating forward and descending, the tap is in contact with the tap contact member 5 when the flow switch continues to be in the ON state without being in the OFF state. It can be detected that the tap is broken, or that the tap mold is not provided with a tap, or that the tap is shorter than the specified length.

  Further, when the tap 111 is operated in the forward and reverse directions, it can be detected that the tap is in the lowered state when the flow switch indicates the ON, OFF, and OFF states. That is, in this case, it can be detected that the tap remains without coming out upward from the workpiece.

  Furthermore, if the tap 111 is in the OFF, OFF, or OFF state during forward or reverse rotation, the inner cylinder 7 has already been lowered and can be detected as a sliding failure.

  And, when the state of the flow switch changes to ON, OFF, ON state when the tap 111 descends in the normal rotation, the tap provided in the tap mold is a tap having a larger diameter than the specified tap. Alternatively, it can be detected that the length of the tap is longer than a predetermined length. That is, when the tap 111 is lowered from the state shown in FIG. 5A and the tap contact member 5 is pushed down, the air supply provided in the die body 3 in the state shown in FIGS. 5C and 6A. The mouth 11 is in a state of being blocked by the land portion 25C of the inner cylinder 7, and the flow switch is in an OFF operation state. From this state, when the tap 111 is further lowered to the lowest position, the inner cylinder 7 is further lowered by the tap 111, and the upper communication portion 25 </ b> A in the recess 25 formed on the outer peripheral surface of the inner cylinder 7 is provided in the die body 3. The air switch 11 communicates with the air supply port 11 and the flow switch is turned on.

  Therefore, when the flow switch is turned ON, OFF, or ON during the tap lowering operation, it can be detected as a tap overstroke. Therefore, in this case, the tap mold is replaced with a tap mold having a predetermined tap or a tap having a predetermined length.

  As described above, the chips generated by performing the tapping process on the prepared hole of the workpiece fall into the inner cylinder 7. At this time, a part of the cutting powder tends to remain on the upper surface 5U of the tap contact member 5, but the upper surface 5U is formed in a curved surface where both sides in the thickness direction of the tap contact member 5 are lowered. , It is dropped without remaining on the upper surface 5U. In addition, the relatively long spiral chips tend to be wound around and entangled with the tap contact member 5, but the vertical width of the tap contact member 5 is large so that the chips cannot be wound and entangled. Since it is formed in the width dimension, it is possible to prevent the chips from being wound and entangled with respect to the tap contact member 5.

  Furthermore, the outer diameter of the inner cylinder 7 is formed to be substantially equal to the inner diameter of the tap body 3, and in the normal state, the upper end (upper surface) 7U of the inner cylinder 7 is the upper end of the tap body 3, that is, the press ring 15 Since the upper end portion (upper surface) 15U of the inner cylinder 7 is held substantially in the same state, chips do not enter between the tap main body 3 and the inner cylinder 7, and The vertical movement can always be performed smoothly.

  As can be understood from the above description, according to the tap die 1 according to the present embodiment, the discharge of chips generated during tapping is improved, and the smooth vertical movement of the inner cylinder 7 with respect to the die body 3 is hindered. There is nothing that can be done. Further, when the air supply state into the inner cylinder 7 in the tap die 1 can be detected by the fluid sensor and the inner cylinder 7 is lowered by the tap in the punch press, the fluid sensor is turned ON, OFF, ON. The tap overstroke can be easily detected.

  In addition, since the fluid sensor is composed of a flow switch that detects the air flow in the connection path, unlike the pressure switch, the air flow can be accurately detected without being affected by pressure fluctuations. Communication and blocking of the air supply port 11 provided in the main body 3 can be accurately detected.

It is a perspective explanatory view of the tap die concerning the embodiment of the present invention. It is a plane explanatory view same as the above. FIG. 3 is a cross-sectional explanatory view along AA and BB in FIG. 2. FIG. 3 is a cross-sectional explanatory diagram along CC and DD in FIG. 2. It is operation | movement explanatory drawing of a tap die. It is operation | movement explanatory drawing of a tap die. It is sectional explanatory drawing which shows the conventional tap metal mold | die and a tap die.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tap die 3 Die main body 5 Tap contact member 5U Upper surface 7 Inner cylinder 7U Upper end part 11 Air supply port 15 Presser ring 15U Upper end part 19 Elastic member 25 Recessed part 25A, 25B Communication part 25C Land part 27 Air ejection hole

Claims (1)

A tap die used in cooperation with a tap die used by being mounted on a punch press, and is moved downward by a tap provided in the cylindrical die body so as to be movable up and down. An inner cylinder provided with a pressed tap contact member is provided to be movable up and down and urged upward, and the upper end of the inner cylinder is normally provided at substantially the same height as the upper end of the die body. In addition, the tap contact member is formed of a plate material having the same thickness over the entire length, and both end sides of the tap contact member are positioned at positions corresponding to the radial recesses provided on the upper surface of the inner cylinder. The vertical dimension of the tap abutting member attached to the cylinder is several times to several tens of times the plate thickness in order to prevent the long spiral chips generated by tapping from being wound. Thea is formed in the width dimension of is, The lower end of the serial tap contact member is characterized in that is provided in an upper position than the air injection hole provided in the inner cylinder Tappudai.

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