JP2011235427A - Tapping machining method and tapping die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tapping machining method which prevents chips produced upon tapping machining from coming into a tapping die, and a tapping die.SOLUTION: According to the tapping machining method, tapping machining is carried out using a tapping die 1 attached to a punch press in place of a punch die. In an external cylinder 3 of the tapping die 1, a tap holder 37 having a tap T on its lower end is disposed to rotate and move up and down freely. Under the external cylinder 3, an under cover 45 is disposed, which has a tap insertion hole 45H allowing the tap T to penetrate therethrough. A pressure fluid in a fluid pressure chamber 47 formed above the under cover 45 is jetted out of the tap insertion hole 45H along chip discharge grooves formed on the tap T so that chips produced upon tapping machining by the tap T are prevented from climbing up along the chip discharge grooves into the tapping die 1 as tapping machining is carried out.

Description

  The present invention relates to a tapping process method and a tapping mold in which a tapping mold is attached to a punch press such as a turret punch press, and more specifically, a tapping process is performed by cutting chips generated during tapping. The present invention relates to a tapping method and a tapping mold that can prevent entry into a mold.

  For example, in a punch press such as a turret punch press, punching or burring is performed on a plate-shaped workpiece, and tapping is performed on the hole after punching or the hole after burring. (For example, refer to Patent Document 1).

JP-A-4-41025

  The tapping die described in Patent Document 1 is provided with a tap at the lower end in an outer cylinder that is supported by a punch holder in a punch press (in the case of a turret punch press, the upper turret corresponds to the vertical movement). The tap holder is configured to be movable up and down and rotatable. The tap holder is provided with a fluid hole for injecting and supplying cutting oil to the tap. In addition, a skirt for preventing scattering of cutting oil is provided at a lower portion of the outer cylinder.

  In the above configuration, the cutting oil can be supplied to the tap, but the chips generated during the tapping process rise along the chip discharge grooves provided in the tap and enter the tapping mold. In the conventional configuration, it is difficult to remove the fine chips adhering to the valley of the tap, and it falls on the upper surface of the workpiece when the mold is changed. May cause scratches on the surface.

  The present invention has been made in view of the above-described problems, and is a tapping method for performing tapping with a tapping die attached to a punch press in place of the punch die, and includes an inner cylinder in the tapping die. The lower end of the outer cylinder is provided with a tap holder having a tap at its lower end, and a lower cover provided with a tap insertion hole through which the tap can be inserted. The pressure fluid in the fluid pressure chamber formed on the tap is ejected from the tap insertion hole along the chip discharge groove formed in the tap, and the chips generated during tapping by the tap rise along the chip discharge groove. Then, the tapping process is performed while preventing the tapping from entering the tapping mold.

  Also, a tapping mold that is used in place of a punch mold and mounted on a punch press, and a tap holder having a tap at a lower end portion is rotatably and vertically movable in an outer cylinder of the tapping mold. A lower cover provided with a tap insertion hole through which the tap can be inserted at the lower part of the outer cylinder, and chips generated during tapping by the tap rise along a chip discharge groove provided in the tap. In order to prevent entry into the outer cylinder, a fluid pressure chamber for ejecting pressure fluid along the chip discharge groove of the tap is provided on the upper side of the lower cover. To do.

  Also, it is a tapping mold that is used in place of a punch mold in a punch press, which is attached to a lower piston rod that can be moved up and down and rotated on the punch press. A lower part provided with a tap insertion hole through which the tap can be inserted in a lower part of an outer cylinder provided with a tap holder provided with a tap so as to be rotatable and movable up and down relatively relative to the outside of the mold body. The chip discharge of the tap is provided in order to prevent the chips generated during the tapping process by the tap from rising along the chip discharge groove provided in the tap and entering the outer cylinder. A fluid pressure chamber for ejecting pressure fluid along the groove is provided on the upper side of the lower cover.

  According to the present invention, when the chips generated during tapping by the tap tend to rise along the chip discharge groove provided in the tap and enter the tapping mold, the pressure fluid in the fluid pressure chamber is tapped. By blowing out along the chip discharge groove, it is possible to prevent the chips from entering the tapping mold. Further, when the pressure fluid is ejected along the chip discharge groove, a part of the pressure fluid passes through the valley portion due to the inclination of the valley portion in the tap, and enters the valley portion. This prevents fine chips from adhering. That is, chip adhesion to the tap is effectively prevented.

It is a section explanatory view of the tapping mold concerning the 1st embodiment of the present invention. It is operation | movement explanatory drawing of the tapping metal mold | die which concerns on the 1st Embodiment of this invention. It is a cross-sectional explanatory view of the tapping mold according to the second embodiment of the present invention. It is operation | movement explanatory drawing of the tapping metal mold | die which concerns on the 2nd Embodiment of this invention.

  Referring to FIG. 1, a tapping die 1 according to an embodiment of the present invention is used by being mounted on a punch press (not shown) such as a turret punch press instead of a punch die. An outer cylinder 3 is provided that is fitted and supported in a die mounting hole in a punch holder in a punch press (an upper turret corresponds to the turret punch press: not shown) so as to be movable up and down. A hollow rotary shaft 7 is rotatably supported on the upper portion of the outer cylinder 3 via a bearing 5, and a rotation transmission member 9 such as a pulley or a gear is integrally formed on the upper portion of the hollow rotary shaft 7. It is installed in. The rotation transmitting member 9 is interlocked with a rotating means (not shown) such as a motor provided in the punch press.

  A hollow shaft 11 is fitted and supported on the hollow rotary shaft 7 so as to be movable only in the vertical direction. That is, the hollow shaft 11 rotates integrally with the hollow rotary shaft 7 via a key (not shown) or by spline fitting, and is provided to be movable up and down with respect to the hollow rotary shaft 7. ing. A head member 13 is integrally attached to the upper end portion of the hollow shaft 11, and the upper surface of the head member 13 is provided with a pipe 15 that is long in the downward direction, and is also provided in a punch press so as to be movable up and down. A turntable 21 having a connection port 19 that can be connected to the fluid supply hole 17 of the striker ST is rotatably provided.

  Therefore, when the striker ST is lowered and comes into contact with the head member 13, the head member 13 is lowered, and the fluid supply hole 17 provided in the striker ST and the connection port 19 of the turntable 21 are connected. Therefore, a pressure fluid such as oil mist supplied from the fluid supply hole 17 can be supplied into the tapping mold 1 through the pipe 15.

  Inside the outer cylinder 3, a female screw member 25 having a female screw 23 having the same pitch as the pitch of the threaded portion of the tap T is fitted freely through a key (not shown) only in a vertical movement. A male screw 31 of a male screw member 29 supported in the outer cylinder 3 via a bearing 27 so as to be rotatable and movable up and down is screwed into the female screw 23 of the female screw member 25 so as to be movable up and down. . Between the female screw member 25 and the bearing 27, an elastic member 33 such as a return spring that presses and biases the female screw member 25 upward is elastically mounted. The upper surface of the female screw member 25 pressed and urged upward by the elastic member 33 is in a relatively rotatable contact with the lower surface of the hollow shaft 11 via a bearing.

  The male screw member 29 is formed in a cylindrical shape having a small-diameter portion 29A in the upper portion and a large-diameter portion 29B in the lower portion, and the pipe 15 is inserted into the small-diameter portion 29A downward from the upper end surface. is there. In the large-diameter portion 29B of the male screw member 29, there is provided a cylindrical holder main body 35 that can rotate integrally and move up and down with respect to the male screw member 29. The tap holder 37 provided with the tap T at the lower part so as to be detachable and replaceable is integrally fitted and fixed. A flow path 39 through which the pressure fluid can flow downward is formed between the inner peripheral surface of the holder body 35 and the outer peripheral surface of the tap holder 37.

  Between the upper surface of the tap holder 37 and the male screw member 29, an elastic member 41 such as a coil spring that presses and biases the tap holder 37 downward is elastically mounted. A ring-like stopper 43 for preventing the holder main body 35 from coming out downward is screwed to the lower end portion of the male screw member 29.

  A lower cover 45 having a tap insertion hole 45H having a diameter slightly larger than the outer diameter of the tap T is detachably attached to a lower end portion of the outer cylinder 3 via a fixture (not shown) such as a bolt. It is installed. The lower cover 45 prevents chips generated during tapping from entering the outer cylinder 3, and the lower cover 45 is attached to the lower end of the outer cylinder 3, so that the outer cylinder 3 A fluid pressure chamber 47 is formed on the inner side of the lower end portion and / or the upper side of the lower cover 45.

  In the configuration as described above, tapping is performed on a pilot hole formed in a plate-shaped workpiece on a tap die (not shown) provided in a die holder in a punch press (a lower turret corresponds to a turret punch press: not shown). In order to perform processing, the striker ST in the punch press is lowered. Then, when it comes into contact with the head member 13 of the tapping mold 1, the tapping mold 1 is lowered with respect to the punch holder against the urging force of a lifter spring (not shown) provided in the punch press.

  As described above, when the tapping mold 1 is lowered and the lower cover 45 provided at the lower end portion of the outer cylinder 3 comes close to the upper surface of the workpiece, the lowering of the outer cylinder 3 is restricted and stopped. Thereafter, the female screw member 25, the male screw member 29, and the like are lowered against the urging force of the elastic member 33. As described above, after the striker ST contacts the head member 13 or almost simultaneously with the lowering of the female screw member 25 and the male screw member 29, the oil is supplied from the fluid supply hole 17 provided in the striker ST. When a pressure fluid such as mist is ejected, the pressure fluid is supplied to the fluid pressure chamber 47 through the inside of the pipe 15 and the male screw member 29 and accumulated in the fluid pressure chamber 47.

  When the male screw member 29 is rotated forward through the pulley 9, the hollow rotary shaft 7, and the hollow shaft 11 by a driving means such as a motor, the tap T is also rotated forward. Accordingly, the male screw member 29 is lowered while rotating with respect to the female screw member 25, and the tap T that rotates integrally with the male screw member 29 and integrally descends from the tap insertion hole 45 </ b> H of the lower cover 45. It protrudes downward, and tapping is performed on the pilot hole of the workpiece.

  As described above, the chips produced when tapping the pilot hole of the work are along the chip discharge grooves (straight or spiral grooves) formed at a plurality of locations on the outer peripheral surface of the tap T. It tends to rise and enter the outer cylinder 3 in the tapping mold 1. However, when tapping is performed by the tap T, the pressure fluid is supplied from the fluid supply hole 17 of the striker ST, and the pressure fluid accumulated in the fluid pressure chamber 47 is transferred to the tap insertion hole 45H of the lower cover 45. Is ejected along the chip discharge groove of the tap T.

  Accordingly, the chips that tend to rise along the chip discharge groove of the tap T are scattered around the tap T on the lower side of the lower cover 45, and the inside of the outer cylinder 3 in the tapping mold 1 Intrusion is prevented. As described above, when the pressure fluid is ejected from the tap insertion hole 45H, a part of the pressure fluid is ejected downward along the valley of the tap T located in the tap insertion hole 45H. The fine chips do not remain in the valley of the tap T, and the tap T can be easily cleaned.

  After completion of the tapping process on the prepared hole of the workpiece, the pulley 9 is reversely rotated and the striker ST is raised and returned to return to the initial state. It is desirable that the ejection of the pressure fluid from the tap insertion hole 45H of the lower cover 45 is continued until the tip of the tap T returns to the position of the tap insertion hole 45H. That is, as described above, by continuing the ejection of the pressure fluid until the tip of the tap T rises to the tap insertion hole 45H, it is possible to more reliably remove the cut off adhering to the tap T. .

  FIG. 3 shows a tapping mold 51 according to the second embodiment of the present invention. This tapping die 51 is mounted on a punch support 53 in a punch press described in Japanese Patent Application Laid-Open No. 2002-143945 in place of the punch, and is the same as the pull stud in the punch mounted on the punch press. A mold main body 57 having a pipe-shaped pull stud 55 at the top is provided. An annular outer cylinder 59 corresponding to a plate presser in the punch is relatively rotatably provided on the outer peripheral portion of the mold main body 57 in the tapping mold 51, and the outer peripheral surface of the outer cylinder 59 is provided. Is provided with a replacement groove 61 corresponding to the punch replacement groove in the punch.

  Therefore, the tapping mold 51 can be used by being mounted on a punch press as described in JP-A-2002-143945.

  On the lower surface of the mold main body 57, an internal gear 63 integrally provided inside the outer cylinder 59 is relatively rotatably disposed. A lower portion of the internal gear 63 has a central portion. A disc-shaped base member 67 having a boss portion 65 is integrally attached to the boss portion 65. A pipe-like male screw member 71 having a sun gear 69 at an intermediate height position is fitted inside the pull stud 55 of the mold body 57 so as to be rotatable and vertically movable.

  A male screw 73 is formed on the outer peripheral surface of the lower end portion of the male screw member 71, and this male screw 73 is screwed to a female screw 77 of a female screw member 75 fixed to the boss portion 65 of the base member 67 so as to move up and down. is there. A tap holder 79 is fitted into the male screw member 71 so as to be freely movable up and down, and a tap TA having a threaded portion having the same pitch as the male screw 73 and the female screw 77 is attached to and detached from the lower part of the tap holder 79. It is prepared to be exchangeable. An elastic member 83 such as a coil spring that presses and urges the tap holder 79 downward is provided between the upper surface of the tap holder 79 and the spring seat 81 that is screwed and fixed to the upper end of the male screw member 71. It is armed.

  The sun gear 69 of the male screw member 71 meshes with a large-diameter gear 85L of a plurality of first planetary gears 85 whose both ends are rotatably supported by the mold body 57 and the base member 67. The internal gear 63 meshes with a small-diameter gear 87S of a plurality of second planetary gears 87 whose both ends are rotatably supported by the mold body 57 and the base member 67. The small diameter gear 85S in the first planetary gear 85 and the large diameter gear 87L in the second planetary gear 87 are meshed (the meshing state is omitted in FIG. 3). That is, the internal gear 63, the sun gear 69, and the plurality of first and second planetary gears 85 and 87 constitute a planetary gear mechanism.

  An annular base cover 89 in which the boss portion 65 of the base member 67 is fitted and supported is integrally attached to the lower surface of the outer cylinder 59 by a plurality of attachments such as bolts. A lower cover 91 provided with a tap insertion hole 91H through which the tap TA can be inserted is integrally attached to the lower surface of the portion by a plurality of attachments such as bolts. A fluid pressure chamber 93 is formed between the lower cover 91 and the boss portion 65, and a fluid passage 95 formed in the base cover 89 communicates with the fluid pressure chamber 93. . The channel 95 communicates with a fluid supply hole (not shown) provided in the punch support portion 53.

  In the above-described configuration, the pull stud 55 in the tapping mold 51 is attached to the lower part of the lower piston rod 97 that is movable up and down and rotatable in the punch press described in JP-A-2002-143945, and the outer cylinder. By attaching 59 to the punch support portion 53, the tapping die 51 can be used in the punch press in place of the punch.

  When the lower piston rod 97 is rotated forward, the second planetary gear 87 rolls with respect to the internal gear 63, and the first planetary gear 85 meshed with the second planetary gear 87 is rotated. The male screw member 71 is rotated forward via the sun gear 69 meshed with the first planetary gear 85. When the male screw member 71 is rotated forward, the tap TA is also rotated positively integrally and lowered while rotating due to the screwed relationship between the male screw member 71 and the female screw member 75. Accordingly, the tap TA is screwed into the pilot hole WH of the workpiece W, and tapping is performed on the pilot hole WH.

  When tapping is performed on the pilot hole WH of the workpiece W as described above, the pressure fluid such as oil mist supplied to the fluid pressure chamber 93 through the flow path 95 and accumulated in the fluid pressure chamber 93 is The cover 91 is ejected downward from the tap insertion hole 91H. Accordingly, even when the chips generated by the tapping process tend to rise along the chip discharge grooves of the tap TA and enter the tapping mold 51, the chips are cut in the same manner as in the above-described embodiment. It is possible to prevent the powder from entering the tapping mold 51.

  When the lower piston rod 97 is reversely rotated and the tap TA is raised and returned, the fine chips in the tap TA chip discharge groove and the tap TA can be blown away for cleaning. The same effect can be obtained.

1,51 Tapping mold 3 Outer cylinder 7 Hollow shaft 9 Rotation transmission member (pulley)
DESCRIPTION OF SYMBOLS 11 Hollow shaft 13 Head member 17 Fluid supply hole 21 Turntable 23,77 Female screw 25,75 Female screw member 29,71 Male screw member 31,73 Male screw 33 Elastic member (return spring)
35 Holder body 37, 79 Tap holder 45, 91 Lower cover 45H, 91H Tap insertion hole 47, 93 Fluid pressure chamber 53 Punch support part 55 Pull stud 57 Mold body 59 Outer cylinder 63 Internal gear 67 Base member 69 Sun gear 85 First 1 planetary gear 87 2nd planetary gear ST striker

Claims (3)

  A tapping method for performing tapping with a tapping die attached to a punch press instead of a punch die, wherein a tap holder having a tap at a lower end portion is rotatably and vertically moved in an outer cylinder of the tapping die. A lower cover having a tap insertion hole through which the tap can be inserted is provided at a lower portion of the outer cylinder, and pressure fluid in a fluid pressure chamber formed on the upper side of the lower cover is passed through the tap insertion hole. Tapping is performed while spraying along the chip discharge groove formed on the tap and preventing chips generated during tapping by the tap from rising along the chip discharge groove and entering the tapping mold. Tapping method characterized by performing.   It is a tapping mold that is used in place of a punch mold and attached to a punch press.In the outer cylinder of the tapping mold, a tap holder having a tap at the lower end is provided rotatably and vertically movable, A lower cover having a tap insertion hole through which the tap can be inserted is provided at the lower part of the outer cylinder, and chips generated during tapping by the tap rise along a chip discharge groove provided in the tap. Tapping characterized by comprising a fluid pressure chamber on the upper side of the lower cover for ejecting pressure fluid along the chip discharge groove of the tap in order to prevent entry into the outer cylinder. Mold.   A tapping die that is used in place of a punch die in a punch press. A tapping die is attached to a lower piston rod that is vertically movable and rotatable on the punch press, and a tap is provided at the lower end. A lower cover provided with a tap insertion hole through which the tap can be inserted is provided at a lower portion of an outer cylinder which is provided with a tap holder provided so as to be rotatable and vertically movable, and is relatively rotatable outside the mold body. In order to prevent chips generated during tapping by the tap from rising along the chip discharge groove provided in the tap and entering the outer cylinder, the chip discharge groove of the tap A tapping mold comprising a fluid pressure chamber for ejecting pressure fluid along the upper side of the lower cover.

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