JP2018089723A - Tap die - Google Patents

Abstract

A tap die capable of smoothly discharging chips generated during tapping of a work is provided. A tap die used in cooperation with a tap die mounted on a punch press is provided in a cylindrical die body 3 so as to be vertically movable with respect to the tap die. The inner cylinder 5 is provided with a tap contact member 41 which is pressed downward by the tap so as to be vertically movable and is biased upward. It is cantilevered on the surface 5F. The upper portion of the tap contact member 41 is formed into a convex curved surface that is highest at the center and gradually lowers at the periphery. [Selection drawing] Fig. 2

Description

  The present invention relates to a tap die used in cooperation with a tap die used by being mounted on a punch press such as a turret punch press. More specifically, the present invention relates to a tap die that can satisfactorily discharge chips generated during tapping.

  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 die provided with a tap for performing tapping so as to be rotatable and vertically movable. And the tap die used in cooperation with the said tap metal mold | die is provided in the downward position of the tap metal mold | die (for example, refer patent document 1).

Japanese Patent No. 5385573

  According to the configuration described in Patent Document 1, long chips generated during tapping can be discharged well. However, it is the structure provided with the tap contact member which crosses the opening part center of the inner cylinder in a tap die. Therefore, the opening is bisected. Therefore, the chip discharge port in the opening is narrowed, and sometimes long chips are entangled to form a large lump and clog.

  The present invention has been made in view of the above-described problems, and is a tap die used in cooperation with a tap die used by being mounted on a punch press, and the tubular die body includes the above-described tap die. An inner cylinder provided with a tap contact member that is pressed downward by a tap that is provided on the tap mold so as to be movable up and down is provided with an up and down movement and is urged upward. The inner cylinder is supported in a cantilever manner on the inner peripheral surface thereof.

  Further, in the tap die, the upper portion of the tap contact member is formed in a convex curved surface having the highest central portion and the periphery gradually lowering.

  Further, in the tap die, the tap contact member includes a support portion having a diameter smaller than the maximum diameter of the tap contact member, and is attached to a front end portion side of a bracket provided in a cantilever manner on the inner surface of the inner cylinder. The support portion is supported.

  Further, in the tap die, both side edge portions of the bracket and the inner peripheral surface of the inner cylinder are connected by a concave curved surface, and the upper surface of the bracket is formed on an inclined surface where the both side edge portions are lowered.

  Further, the tap die includes a fluid passage that is cut off from communication by the vertical movement of the inner cylinder with respect to the die body.

  According to the present invention, since the tap contact member is supported in a cantilever manner on the inner peripheral surface of the inner cylinder, the chip discharge port at the opening of the inner cylinder can be enlarged. Therefore, even when long chips are entangled, the chips can be easily discharged.

It is a perspective explanatory view of the tap die concerning the embodiment of the present invention. It is a plane explanatory view of the tap die concerning the embodiment of the present invention. It is front explanatory drawing of the tap die which concerns on embodiment of this invention. It is a section explanatory view of a tap die concerning an embodiment of the present invention. It is a section explanatory view of a tap die concerning an embodiment of the present invention. It is a plane explanatory view of a bracket.

  Hereinafter, a tap die 1 according to an embodiment of the present invention will be described with reference to the drawings. A tap die (not shown) mounted on a punch press (not shown) such as a turret punch press, for example, as in a conventional tap die. It is used in cooperation with. The tap die 1 has a configuration in which an inner cylinder 5 is vertically movable in a cylindrical die body (outer cylinder) 3. As shown in FIG. 3, the tap die 1 is removably mounted in a die mounting hole 9 formed in a die holder 7 in a punch press.

  A flow path 13 connected to an air source 11 is connected to the die mounting hole 9. The flow path 13 is provided with a sensor 15 such as a flow switch or a pressure switch. A circumferential groove 17 is formed on the outer peripheral surface of the die body 3 in the tap die 1, and the flow path 13 is connected to the die mounting hole 9 at a height position corresponding to the circumferential groove 17. In addition, longitudinal grooves 19 communicating with the circumferential groove 17 are formed at a plurality of locations on the outer peripheral surface of the die body 3. Near the lower end of the vertical groove 19, a communication hole 21 is provided as a fluid passage communicating between the outer peripheral surface of the inner cylinder 5 and the inner peripheral surface of the die body 3.

  A recess 23 (see FIG. 3) is formed on the outer peripheral surface of the inner cylinder 5 at a position corresponding to the communication hole (fluid passage) 21. The recess 23 communicates with the inside of the inner cylinder 5 through a communication hole 25 (see FIGS. 4 and 5). And the said recessed part 23 is formed long vertically, The land part 27 (refer FIG. 3) which can close the said communicating hole 21 is provided in the center part. In the die body 3, an O-ring 29 that seals between the inner peripheral surface of the die mounting hole 9 is provided above the circumferential groove 17.

  In the above configuration, when air is supplied from the air source 11 into the die mounting hole 9 of the die holder 7, the air in the die mounting hole 9 passes through the circumferential groove 17, the vertical groove 19, the communication hole 21, the recess 23 and the communication hole 25. After that, it flows out into the inner cylinder 5. When the inner cylinder 5 is lowered relative to the die body 3 and the land portion 27 closes the communication hole 21, the air flow is blocked. This blockage of the air flow is detected by the sensor 15. That is, it is detected that the tap in the tap mold has been lowered by a distance necessary for tapping. Since the configuration as described above is a configuration known in Patent Document 1, a more detailed description is omitted.

  Now, in order to support the inner cylinder 5 so as to be movable up and down with respect to the die body 3, vertical spring holes 31 (see FIG. 4) are formed at a plurality of locations on the die body 3. The inner cylinder 5 is integrally provided with a pin 33 penetrating vertically through a vertical slit 31S formed along the spring hole 31. The tip of the pin 33 is supported by a coil spring 35 elastically mounted in the spring hole 31. A ring-shaped spring seat 37 on which the coil spring 35 is elastically mounted is integrally attached to the lower surface of the die body 3 by a plurality of mounting screws 39 (see FIG. 5).

  As understood from the above configuration, the inner cylinder 5 is always urged upward by an urging means such as a coil spring 35. The pin 33 is locked at the upper end of the slit 31, so that the pin 33 is always located at a constant height in the normal state. That is, the upper part of the die body 3 and the upper part of the inner cylinder 5 are always located at the same height. In other words, when the inner cylinder 5 is pressed downward against the urging force of the coil spring 35, the inner cylinder 5 can be lowered.

  Inside the inner cylinder 5 is provided a tap contact member 41 (see FIG. 4) that is pressed downward by a tap provided on the tap mold so as to be movable up and down. As shown in FIG. 2, the tap contact member 41 is provided at a position that coincides with the axis of the inner cylinder 5. More specifically, the tap contact member 41 is integrally supported via a mounting bolt 45 on the distal end side of a bracket 43 that is integrally fixed in the inner cylinder 5 in a cantilever manner.

  The upper portion 41A of the tap contact member 41 is formed in a hemispherical convex curved surface, for example. The upper portion 41A of the tap contact member 41 is not limited to a hemispherical shape, and may be an appropriate convex curved surface such as a parabolic rotating curved surface. The lower part of the tap contact member 41 is formed in a column part 41B having a diameter smaller than the maximum horizontal diameter of the convex curved surface of the upper part 41A. The lower surface of the support column 41B is erected on the bracket 43 with the upper surface of the bracket 43 being in contact with the upper surface on the front end side. At this time, the uppermost part of the tap contact member 41 is set lower than the upper end edge of the inner cylinder 5 as shown in FIGS.

  The bracket 43 has a configuration in which an arcuate curved surface 47 (see FIG. 6) aligned with the inner peripheral surface of the inner cylinder 5 is provided at the base end portion. On the distal end side, a substantially semicircular support plane portion 49 corresponding to the horizontal cross-sectional shape of the column portion 41B of the tap contact member 41 is provided. Both side edge portions 43A and 43B of the bracket 43 are formed as concave curved surfaces in which the inner peripheral surface 5F (see FIG. 6) of the inner cylinder 5 and the support flat portion 49 are smoothly connected. The shape of the bracket 43 when viewed in plan is symmetrical with respect to the center line L of the bracket 43 in FIG.

  In the bracket 43, an inclined surface is formed on the upper surface of the bracket 43, with the center line L positioned at the peak 51 and lower on both sides. That is, the left and right sides in FIG. 6 are provided with the side edge portions 43A and 43B which are concave curved surfaces. And the inclined surface is formed so that the said side edge part 43A, 43B side may become low. That is, the regions 51A and 51B surrounded by the lines A and B and the side edge portions 43A and 43B shown in FIG. 6 are formed on the inclined surface. In other words, the upper surface of the bracket 43 forms an inclined surface in which the side edge portions 43A and 43B on both sides are lowered, so that only the portion of the peak 51 is formed into a flat surface or a convex curved surface.

  That is, the upper surface of the bracket 43 is formed on a sliding surface (inclined surface) on which chips falling on the upper surface slide down to the side edge portions 43A and 43B.

  As can be understood from the above description, the tap contact member 41 supported in a cantilever manner via the bracket 43 is only located in the center portion inside the inner cylinder 5, and the tap contact Between the member 41 and the inner peripheral surface of the inner cylinder 5, there is a hole 53 having an arc shape as shown in FIG.

  In the configuration as described above, the hole WH formed in the workpiece W is positioned so as to coincide with the center of the tap die 1 as schematically shown in FIG. Then, the tap in the tap mold is lowered and the workpiece W is tapped. When tapping is performed as described above, the tap penetrating the hole WH of the workpiece W comes into contact with the tap contact member 41 provided in the tap die 1. Then, the tap contact member 41 is lowered against the urging force of the coil spring 35.

  As described above, when the tap contact member 41 is lowered, the inner cylinder 5 is lowered with respect to the communication hole 21 provided in the die body 3. Therefore, the land portion 27 (see FIG. 3) in the concave portion 23 formed in the inner cylinder 5 is lowered, and the communication hole 21 is closed. Therefore, the air pressure in the communication hole 21 and the flow path 13 rises, and the sensor 15 detects the pressure rise. That is, it is detected that the tap has penetrated the workpiece W.

  Thereafter, when the tap is rotated in the reverse direction, the tap is lifted away from the tap contact member 41. Therefore, the inner cylinder 5 is raised by the urging force of the coil spring 35. Therefore, the land portion 27 in the recess 23 rises to the original position and releases the closing of the communication hole 21. That is, the air pressure in the communication hole 21 and the flow path 13 is reduced, and an increase in the tap is detected. As can be understood from the above configuration, the tap breakage can be detected by detecting the pressure change in the communication hole 21 and the flow path 13 by the sensor 15 when the workpiece W is tapped.

  As described above, when the workpiece W is tapped, thin and long spiral chips are generated from the workpiece W. Then, the chips fall on the tap contact member 41 and the upper surface of the bracket 43 and are dropped and discharged from the hole 53. The chips generated during the tapping process tend to entangle with the tap contact member 41 and the bracket 43.

  However, since the tap contact member 41 is supported on the inner peripheral surface of the inner cylinder 5 in a cantilever manner, the hole 53 between the inner peripheral surface of the inner cylinder 5 and the tap contact member 41 is divided into two parts. It can be formed large without doing. Accordingly, the chips can be smoothly discharged and discharged.

  And since the upper part of the said tap contact member 41 is formed in the hemispherical convex curved surface, for example, the entanglement of the chip with respect to the tap contact member 41 can be suppressed. Furthermore, the upper surface of the bracket 43 that supports the tap contact member 41 is formed with an inclined surface where both sides are lowered, with the center line L positioned at the peak 51 and the portions reaching the side edge portions 43A and 43B on both sides. Therefore, the chips are smoothly discharged and discharged from the bracket 43.

  In other words, it is generated during tapping because the chips are not easily entangled with the tap contact member 41, the chips are easily dropped and discharged from the bracket 43, and the hole 53 is large without being divided into two parts. Thin and long chips can be easily discharged, and can be prevented from being entangled into a large lump.

DESCRIPTION OF SYMBOLS 1 Tap die 3 Die main body 5 Inner cylinder 5F Inner peripheral surface 11 Air source 13 Flow path 15 Sensor 17 Circumferential groove 19 Vertical groove 21 Communication hole 23 Recessed part 27 Land part 41 Tap contact member 43 Bracket 47 Arc-shaped curved surface 49 Support plane part 51 peaks 53 holes

Claims (5)

  A tap die used in cooperation with a tap die used by being attached to a punch press, and is downwardly moved by a tap provided in the cylindrical die body so as to be movable up and down. An inner cylinder having a tap contact member to be pressed is provided to be movable up and down and biased upward, and the tap contact member is supported in a cantilever manner on the inner peripheral surface of the inner cylinder. A tap die characterized by   2. The tap die according to claim 1, wherein an upper portion of the tap contact member is formed in a convex curved surface having a highest central portion and a gradually lower periphery.   The tap die according to claim 1 or 2, wherein the tap contact member includes a support portion having a diameter smaller than the maximum diameter of the tap contact member, and is a cantilever bracket on the inner surface of the inner cylinder. A tap die characterized in that the support portion is supported on the front end side of the tap die.   4. The tap die according to claim 3, wherein both side edges of the bracket and the inner peripheral surface of the inner cylinder are connected by a concave curved surface, and the upper surface of the bracket is formed on an inclined surface where the side edges are lowered. A tap die characterized by The tap die according to any one of claims 1 to 4, further comprising a fluid passage that is communicated and cut off by a vertical movement of the inner cylinder with respect to the die body.

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