JP3281519B2 - Method and apparatus for inserting die into die insertion hole in punch press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for inserting a die in a turret punch press or other punch press into a die insertion hole of a die holder provided on a base such as a lower turret.

[0002]

2. Description of the Related Art Conventionally, for example, in a turret punch press as a punch press, a plurality of types of dies having different outer diameters are used. When the press is operated, each of these dies is connected to a lower turret via a die holder. Mounted on

[0003] When replacing the die, a series of operations such as separating the die holder from the lower turret, knocking the die out of the die holder, fitting the die to be replaced into the die holder, and attaching the die holder to the lower turret. Accompanied by

In a turret punch press equipped with an automatic tool changer, a removable die holder having the same precision as the die is used, and a method for exchanging the die with the die holder and a unified die shape are used. In such a case, only the die is replaced.

[0005]

In the above-mentioned conventional die replacing method, when manually performed, for each die to be replaced, the die holder is separated, the die is knocked out, the die to be replaced is fitted, and the die holder is replaced. Work such as mounting to the lower turret, and these occupy a large weight in the work process of the turret punch press, so that the burden on the operator was great.

In a turret punch press equipped with an automatic tool changer, in the case of exchanging the entire die holder, it is not possible to exchange each die, or a new die holder having the same precision as the die is required. I had to prepare. For the unified die shape,
It has the disadvantage that conventional dies cannot be used.

On the other hand, conventionally, there has been a problem that has been difficult when exchanging dies. That is, the clearance is 2
If the die is tilted when the die is inserted into the die insertion hole of about 0 micron, the die is obliquely hit on the inner periphery of the die insertion hole, so that the insertion becomes impossible. Therefore, it was necessary to eliminate the inclination of the die to automatically replace the die independently.

An object of the present invention is to enable a plurality of types of dies conventionally used to be automatically replaced independently for each type without using a die holder or the like requiring the same precision as the dies. The present invention provides a die fitting means.

[0009]

According to a first aspect of the present invention, there is provided a method for punch press, comprising the steps of: providing a die holder bottom and a base plate below a die insertion hole formed in a die holder in a punch press; A guide hole concentric with the die insertion hole is provided, and the upper and lower positions of the upper end of the spindle inserted in the guide hole are substantially aligned with the upper surface of the die holder, and in a state where the die is supported by the spindle, The lower part of the vertically movable upper pusher presses the die downward, while the upper part of the vertically movable lower pusher supports the lower end of the support shaft and lowers while holding the die horizontally at the upper end of the support shaft. By doing so, it is fitted into the die fitting hole while being kept horizontal.

[0010]

According to a second aspect of the present invention, there is provided a punch press having a guide hole concentric with the die fitting hole provided on the bottom of the die holder provided on the die holder provided in the die holder and on the base plate, and A lower pusher for vertically moving the spindle inserted into the guide hole, an upper pusher for vertically moving a die supported on the upper end of the spindle, and a die holding and positioning means for holding the die and positioning it on the spindle; And characterized in that:

The device according to the present invention according to claim 3 is a device according to claim 2.
In the apparatus according to the present invention, a flange is provided at the upper end of the support shaft, and the flange is inserted into a die fitting hole, thereby preventing the support shaft from falling off. In addition, the die can be horizontally supported in a more stable state.

[0013]

The device according to the present invention according to claim 4 is a device according to claim 2.
In the apparatus described in Item 3, as the means for holding and positioning the die, a plurality of holding pins are provided on the lower surface of a pair of arms to be opened and closed by opening and closing the arms so as to project a part of the outer periphery of the die. It is characterized by the following.

According to a fifth aspect of the present invention, in the device according to the second or third aspect, as the means for holding and positioning the die, opposing surfaces of a pair of arms that open and close are moved by opening and closing movement of the arms. It is characterized in that it has a shape for holding a part of the outer periphery of the die.

In the above method and apparatus according to the present invention,
The upper and lower pushers are, for example, an air cylinder and a hydraulic cylinder.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of a first apparatus according to the present invention will be described with reference to the drawings, and then a method of inserting a die using the apparatus will be described.

FIG. 1 shows the operation of inserting a die in an embodiment of the first apparatus according to the present invention. The lower part of the die holder below the die insertion hole 3 provided in the die holder 1 in the turret punch press. A guide hole 9 concentric with the die fitting hole 3 is provided in a base 7 called 5 and a lower turret. The support shaft 11 is fitted into the guide hole 9, and the die 13 fitted into the die fitting hole 3 is horizontally supported by the upper end of the support shaft 11. The support shaft 11 may be, for example, an annular support shaft (collar). A flange 11 a is provided at the upper end of the support shaft 11, and the flange 11 a is fitted into the die fitting hole 3.

The support shaft 11 can be raised by a lower pusher 15 such as an air cylinder or a hydraulic cylinder that moves the support shaft 11 up and down.

2 to 5 which can hold one die 13 of a plurality of types having different outer diameters and position it on the support shaft 11, the upper and lower parts 15 a of the lower pusher 15 shown in FIGS. The die 1 pulled out from the die insertion hole 3 onto the die holder 1 by being raised
3, 3 and 4, and a feed screw shaft 25 linked to a motor 23 mounted on a base 21 via a mounting plate 19, as shown in FIGS. On the lower surface of a pair of left and right arms 27 which open and close in the left and right direction, a plurality of holding pins 29 for holding a part of the outer periphery of the die 13 are symmetrically projected by opening and closing movement of the arms 27 in the left and right direction. It is. Here, the feed screw shaft 25 is supported by left and right bearings 33 attached to the base 21 by brackets 31, and the left screw portion 25a
The right and left screw portions 25b are reverse screws, respectively, screwed into nut portions 35 provided on the upper surfaces of the left and right arms 27, respectively, and a U-shaped cross section feeding portion 37 provided at the roots of the left and right arms 27 is provided. The rotational force of the motor 23 is fitted to a guide 39 fixed to the base 21.
5. The driven timing pulley 47 provided at the end of the feed screw shaft 25 and the nut portion 35 provided on the left and right arms 27 via the feed screw shaft 25, whereby the left and right arms 2
7 performs opening and closing movement right and left along the guide 39.

FIG. 6 shows an example of the arrangement of a plurality of holding pins 29 with respect to the left arm 27.
4 pinching pins 2 tangentially at the front and back of the outer circumference of
9, the right arm 27 not shown in the drawing.
Is a symmetrical arrangement. The opening / closing motion of the pair of left and right arms 27 in the left / right direction can hold the die 13 having three types of large, medium, and small outer diameters. The plurality of holding pins 29 hold the die 13 by the thrust of the feed screw shaft 25, guide the vertical movement of the die 13 by providing a gap with the outer periphery of the die 13, and hold the die 13 from the left and right. 13 has a function of centering.

As another example of the sandwiching / positioning means 17 for the die 13, as shown in FIG. 7, a pair of left and right arms 27, which open and close in the left and right directions by a feed screw shaft linked to a motor, are provided. The opening and closing movement of the die 13 in the left-right direction may cause the die 13 to have a shape that clamps a part of the outer periphery. As an example of a specific shape of the opposing surfaces of the pair of left and right arms 27, cutouts 49 are provided on the opposing surfaces so as to be symmetrical with respect to the four sides of the outer periphery of the die 13 to be clamped. There is a shape.

As another example of the driving means of the opening / closing mechanism of the pair of right and left arms 27, there is an oil / pneumatic drive or the like.

An upper pusher 51 such as an air cylinder or a hydraulic cylinder for moving the die 13 supported on the upper end of the support shaft 11 up and down is provided between the left and right arms 27 as shown in FIGS. Set the position, and
And is fixed to the base 21 via. On the outer surface of the upper pusher 51, a rising end auto switch 55 and a falling end auto switch 57 of the upper portion 51a are respectively mounted. At the front end of the upper part 51 a of the upper pusher 51, a cylindrical part 51 b is provided to protrude upward, and this cylindrical part 51 b is fitted to a guide rod 59 fixed to the lower surface of the mounting plate 53.

When the die 13 is inserted into the die insertion hole 3 provided in the die holder 1 by using the above-described apparatus, the upper part 15a of the lower pusher 15 is raised to be inserted into the guide hole 9. The support shaft 11 is pushed up, and the vertical position of the upper end of the support shaft 11 is made to substantially coincide with the upper surface of the die holder 1. Then, as shown in FIGS. 2 and 3, for example, a nut member 6 guided by a guide rail 61 is provided.
3 is provided on the lower surface of the root portion of the base 21, and the feed screw shaft 65 screwed to the nut member 63 is rotated by the servo motor 67 to move the base 21 forward or backward, and to move the base 21 by any other means. With the position of the die 13 held by the plurality of holding pins 29 set just above the die insertion hole 3 provided in the die holder 1, the motor 23 is operated to slightly open the left and right arms 27. For example, the die 13 is supported on the support shaft 11 while being guided by the plurality of holding pins 29. Note that FIG.
As shown in (2), for example, by making a part of the upper turret 69 smaller in diameter than the base plate (lower turret) 7, it is possible to provide a space for die exchange including insertion of the die 13.

Next, as shown in FIG. 1A, by lowering the lower part 51a of the upper pusher 51, the die 13 is pressed downward by the lower part 51a, and at the same time, the upper part 15a of the lower pusher 15 is When the die 13 is lowered while supporting the lower end of the support shaft 11 and holding the die 13 horizontally at the upper end of the support shaft 11, the die 13 does not tilt and maintains a horizontal state as shown in FIG. The fitting holes 3 are fitted.

In the state where the die 13 is fitted in the die fitting hole 3, the lower portion 51a of the upper pusher 51 is provided.
Is raised, and the lower shaft 15 pushes the support shaft 11.
By pushing up, the die 13 can be pulled out from the die insertion hole 3 while maintaining a horizontal state.

An embodiment of the second apparatus according to the present invention will be described with reference to FIG.

FIG. 8 shows the operation of inserting a die in an embodiment of the second apparatus according to the present invention. The lower part of the die holder below the die insertion hole 3 provided in the die holder 1 in the turret punch press. A guide hole 9 concentric with the die fitting hole 3 is provided in a base 7 called 5 and a lower turret. For example, the lower pusher 15 such as an air cylinder or a hydraulic cylinder can insert the upper portion 15a into the guide hole 9 from below by raising the upper portion 15a.

The die holding / positioning means not shown in FIG. 8 is the same as the die holding / positioning means 17 described in the above embodiment, whereby one of a plurality of types having different outer diameters is provided. The die 13 can be positioned on the upper portion 15 a of the lower pusher 15 by sandwiching the die 13.

For example, the upper pusher 51 such as an air cylinder or a hydraulic cylinder is similar to the upper pusher 51 described in the above embodiment, so that the die 13 supported on the upper end of the upper portion 15a of the lower pusher 15 is moved downward. Can be pressed.

When the die 13 is inserted into the die insertion hole 3 provided in the die holder 1 by using the above-described apparatus, the upper portion 15a of the lower pusher 15 is raised, so that the guide hole 9 is inserted from below. Lower pusher 1 inserted
5 in the vertical direction of the upper end of the upper part 15a of the die holder 1.
Almost coincide with the upper surface of Next, by using the sandwiching positioning means 17 of the die 13 in the same manner as in the above embodiment,
The die 13 is supported on the upper part 15 a of the lower pusher 15.

Next, as shown in FIG. 8A, the upper part 51a of the upper pusher 51 is lowered to press the die 13 downward with the upper part 51a, and at the same time, the upper part 15a of the lower pusher 15 supports the die 13. When the die 13 is lowered while holding the die 13 horizontally with the upper part 15a of the lower pusher 15, the die 13 is not inclined and the die insertion hole 3 is maintained while being kept horizontal as shown in FIG. 8B. Is inserted into.

In a state where the die 13 is fitted in the die fitting hole 3, the upper part 51a of the upper pusher 51 is provided.
Is raised, and the die 13 is moved by the lower pusher 15.
By pushing up, the die 13 can be pulled out from the die insertion hole 3 while maintaining a horizontal state.

As shown in FIG. 9, when the die 13 is inserted into the die insertion hole 3, the position of the die 13 is slightly shifted from the die insertion hole 3 in the horizontal direction due to an error in the mechanical device. There is. The upper pusher 51 holds the die 1
3 is pushed from above with a force P. At this time, the frictional force generated on the bottom surface of the die 13 is μP (μ is a coefficient of friction). The entrance of the die insertion hole 3 of the die holder 1 is chamfered at, for example, 30 degrees, and the horizontal component force when the die 13 contacts the chamfered portion 71 is Px. Here, if Px> μP, the die 13 moves in the horizontal direction without tilting, and is inserted into the die insertion hole 3. The die 13 and the die 1
The coefficient of friction with the surface that 3 contacts is the same.

As shown in FIG. 10, P × {(1 / tan θ) −μ} obtained by subtracting a loss μP caused by friction generated in the chamfered portion 71 from a horizontal component force P × (1 / tan θ) caused by P. Is a force Px for moving the die 13 in the horizontal direction.
When Px> μP as described above, the die 13 is inserted into the die insertion hole 3 without tilting, so that Px = P × ｛(1 /
tan θ) −μ｝> μP, and therefore (1 / tan
θ)> 2μ. Therefore, if μ = 0.2 here, θ <68, 2 degrees. The chamfer angle of 30 degrees has sufficiently cleared the limit angle of 68.2 degrees, and the die 1
When the corner portion 3 is located inside the chamfered portion 71, the die 13 can be sufficiently shifted in the horizontal horizontal direction by the pressing force of the upper pusher 51 and can be slid into the die insertion hole 3.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes.

[0038]

According to the method according to the present invention, the die can be securely inserted into the die insertion hole while keeping the die horizontal without tilting. Therefore, conventionally,
The problem that was considered difficult when replacing the die, that is, the problem that the die is inclined when the die is inserted into the die insertion hole and the die hits the inner periphery of the die insertion hole obliquely, and the insertion becomes impossible. Solvable.

The device according to the present invention according to claims 2 and 3
Since it is used for carrying out the invention of the method of the present application, it is possible to ensure that the die can be securely inserted into the die insertion hole while keeping the die horizontal without tilting, as described above.

In particular, the apparatus according to the present invention according to the fourth and fifth aspects of the present invention is capable of clamping one die of a plurality of types having different outer diameters and positioning the die on the support shaft or on the upper portion of the lower pusher. Since it has a function to keep the die horizontal when the die moves up and down,
Since one die of a plurality of types having different outer diameters can be fitted into the respective die fitting holes, an automatic die changing device can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an operation of inserting a die in an embodiment of a first device according to the present invention.

FIG. 2 is a plan view showing an example of a die holding / positioning means and an upper pusher.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 2;

FIG. 6 is an explanatory diagram showing an example of the arrangement of a holding pin with respect to an arm.

FIG. 7 is a plan view showing another example of the die holding and positioning means.

FIG. 8 is a cross-sectional view showing an operation of inserting a die in one embodiment of the second device according to the present invention.

FIG. 9 is a cross-sectional view showing a state where the die is fitted while being in contact with the chamfered portion at the entrance of the die fitting hole.

FIG. 10 is an explanatory diagram showing a relationship between a horizontal component force, a frictional force, and the like acting on the die when the die is fitted while being in contact with the chamfered portion at the entrance of the die fitting hole.

[Explanation of symbols]

 Reference Signs List 1 die holder 3 die insertion hole 5 die holder bottom 7 base plate 9 guide hole 11 support shaft 11a flange 13 die 15 lower pusher 15a upper part 17 die holding and positioning means 23 motor 25 feed screw shaft 27 arm 29 holding pin 51 upper pusher 51a lower part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B21D 28/14 B21D 28/36 B21D 37/04 B21D 37/14

Claims (5)

(57) [Claims] 1. A guide hole concentric with the die insertion hole is provided on the bottom of the die holder and the base plate below the die insertion hole provided in the die holder in the punch press, and the upper end of a spindle inserted into the guide hole. In the state where the vertical position of the die is substantially coincident with the upper surface of the die holder, and the die is supported by the support shaft, the die is pressed downward by the lower part of the upper die pusher that can move up and down, and at the same time, the lower part that can move up and down By supporting the lower end of the spindle at the upper part of the die pusher, and lowering the die while holding it horizontally at the upper end of the spindle,
A method of inserting a die into a die insertion hole in a punch press, wherein the die is inserted into the die insertion hole while being kept horizontal. 2. A guide hole provided on the bottom of the die holder provided on the die holder provided in the die holder in the punch press and on the base plate and concentric with the die insertion hole, and a support shaft inserted into the guide hole. And a lower die pusher that moves the
A punch press, comprising: an upper die pusher for vertically moving a die supported on the upper end of the spindle, and a die clamping and positioning means capable of clamping and positioning the die on the spindle. A device for inserting a die into a die insertion hole. 3. A flange is provided at an upper end of the support shaft,
3. An apparatus for inserting a die into a die insertion hole in a punch press according to claim 2, wherein the flange is inserted into the die insertion hole. 4. The clamping and positioning means for the die is provided on a lower surface of a pair of arms which can be freely opened and closed by opening and closing movement of the arms.
4. A die according to claim 2, wherein a plurality of holding pins for holding a part of the outer periphery of the die are provided in a protruding manner.
An apparatus for inserting a die into a die insertion hole in the punch press described in the above. 5. The die holding and positioning means has a shape in which opposing surfaces of a pair of openable and closable arms are held by an opening and closing movement of the arms in the left-right direction to hold a part of an outer periphery of the die. An apparatus for inserting a die into a die insertion hole in the punch press according to claim 2 or 3.