JPH091260A - Quick die change device - Google Patents

Abstract

PURPOSE: To provide a quick die change device which can easily, surely and in short time execute die change, reduce a size/weight of a die and correctly position/fix position of a die in high precision. CONSTITUTION: A quick die change device 10 has a table holder 12b mounted to a press machine, a reference hole H2 is provided at a position having prescribed interval in base face of the table holder 12b, a positioning bolt 21 is fitted into a reference hole H1 of die K and a reference hole H2 of table holder 12b through a torque washer 22. On a recessed part S of the table rear face of table holder 12b, a floating nut 23 is mounted with a prescribed free play in the height direction and peripheral direction. When the position bolt 21 is inserted into the reference holes H1, H2 and the tip of bolt part 21c is abutted on the floating nut 23, by turning the bolt around axis, the floating nut 23 is moved in the range of free play and the bolt part 21c is engaged to a nut groove N.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rapid mold exchanging device used for a press machine such as sheet metal working.

[0002]

2. Description of the Related Art A press machine for sheet metal working of automobile parts and the like is equipped with various dies for punching, drawing, molding, and cutting. It is necessary to accurately position and hold the mold on the movable part of the press machine, and a rapid mold changing device is used as a device for positioning and fixing such a mold. The conventional rapid mold changing apparatus is, for example, as shown in FIG. 11 and FIG.
2b is provided by a guide pipe 3 so as to be movable in the vertical direction, and positioning pins 4, 4 and clamps 5, 5 are attached to the table surfaces of the table holders 2a, 2b. As an operation procedure for attaching the mold K, first, the base holders 2a, 2b
The reference hole H1 of the mold K is aligned with the base surface of the mold K, and the pin grips 6, 6 are operated to project the positioning pins 4, 4 into the base surface and insert them into the reference hole H1. Next, the clamp knob 7 is operated to close the claw portion 8 and hold the mold K. When replacing the mold K, the mold K is removed in the reverse order and another mold is attached in the same manner. In the base portion of the mold K, a reference hole and a base width are generally formed with a certain size so as to correspond to the positions of the positioning pins 4 and 4 and the fixed width of the clamps 5 and 5. .

[0003]

However, according to such a conventional rapid die changing apparatus, when the die is attached,
Since the positioning operation and the clamp operation are performed separately, the pin knob and the clamp knob are sequentially operated, and the replacement work is likely to be complicated. In particular, when a large number of molds are used for processing parts, the burden on the operator becomes large. Further, conventionally, since the mold is formed so as to match the positions of the positioning pin and the clamp, the size of the base portion of the mold becomes relatively large, and the weight tends to increase. Therefore, there has been a problem that it becomes difficult to perform handling such as die replacement, transportation, and storage.

On the other hand, it is possible to simultaneously perform positioning and fixing by attaching a die to the base holder with bolts and nuts. In such an arrangement, when attaching the die, Since it is necessary to hold the bolts and nuts on the front surface of the die of the base holder and the back surface of the base holder, workability during replacement becomes extremely poor. Therefore, the present invention has been made in view of such a current situation, and makes it possible to easily and reliably replace a mold in a short time, and further, to reduce the size and weight of the mold. In addition, it is an object of the present invention to provide a rapid mold changing device capable of accurately positioning and fixing a mold with high accuracy.

[0005]

SUMMARY OF THE INVENTION A rapid mold changing apparatus of the present invention for solving the above problems has a base surface on which a mold is placed, and reference holes of the mold are provided at predetermined intervals on the base surface. A base holder having a reference hole positioned in the base, a bolt inserted through the reference hole of the mold and the base holder, and a shaft portion having an outer diameter capable of sliding contact with the reference hole; A positioning bolt having a head portion formed at one end of the shaft portion with an outer diameter larger than the inner diameter of the reference hole, and a bolt portion formed at the other end of the shaft portion with an outer diameter smaller than the inner diameter of the reference hole. A nut provided on the back surface of the base of the base holder so as to be fitted to the bolt portion of the positioning bolt, the floating nut being attached to the back surface of the base with a predetermined play width in the horizontal direction, the height direction and the circumferential direction. Having And it features. Further, the rapid mold exchanging device of the present invention is characterized in that a torque washer is inserted into the positioning bolt, and the mold and the base holder are sandwiched by the torque washer and the floating nut.

[0006]

According to the rapid die changer of the present invention, first, the reference holes of the die are aligned with the reference holes of the base holder, and the positioning bolts are inserted into the respective reference holes. Next, when the tip of the bolt reaches the floating nut, the positioning bolt is rotated around the axis to engage the bolt with the nut groove. At this time, the floating nut moves within the play width so as to match the rotation axis of the bolt portion, so that the bolt portion easily meshes with the nut groove. Further, when the positioning bolt is tightened, the floating nut is tightened on the base holder side, and the die is fixed to the base holder.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1st Example of this invention is shown in FIGS. As shown in FIG. 2, the rapid mold exchanging device 10 includes table holders 12a, 12 attached to a movable part and a base part of a press machine.
b. A column portion 13 fixed to the movable portion of the press is provided on the top surface of the table holder 12a.
A connecting bolt 14 fixed to the base of the press is provided on the side surface of b. A guide pipe 15 is provided at the connecting portion between the table holders 12a and 12b, and holds each table holder so as to be movable in the axial direction. When the movable part of the press moves up and down, the base holder 12a moves up and down accordingly.

Protective pipes 16a and 16b are axially fixed to the centers of both end portions of the base surfaces of the base holders 12a and 12b so that the base holders 12a and 12b do not fall below a predetermined distance. . A work guide 24 is fixed inside the protection pipes 16a and 16b in the width direction at a predetermined interval.

As shown in FIGS. 3 to 5, the base holder 12
Reference holes H2 are provided at predetermined intervals on the base surfaces of a and 12b, and the reference hole H1 of the mold K is positioned in accordance with the reference holes H2. A positioning bolt 21 is fitted into each of the reference holes H1 and H2 via a torque washer 22. A circular recess S is formed on the back surface of the bases of the base holders 12a and 12b, and a floating nut 23 fitted into the positioning bolt 21 is housed in the recess S. Stand holder 2
The reference holes H2 of a and 2b are formed in the inner hole of the bush 25, and the accuracy of the reference hole H2 is set to the same degree as the accuracy of the reference hole H1 of the mold. If the reference hole H2 of the bush 25 is worn or damaged, the bush 2
It is also possible to replace 5 with a new one.

As shown in FIG. 1, the positioning bolt 21 is constructed by a head portion 21a, a shaft portion 21b, and a bolt portion 21c.
Are formed in the axial direction. The head portion 21a has a diameter larger than the inner diameter of the reference hole, and its cross section is formed into a hexagon. By attaching a wrench or the like to the head portion 21a and rotating the head portion 21a, the positioning bolt 21 can be easily tightened. The shaft portion 21b is a reference hole H for the die and the base holder.
It is formed to have an outer diameter capable of sliding contact with H1 and H2, and its length is slightly shorter than the sum of the lengths of the reference hole H1 and the reference hole H2. The peripheral surface of the shaft portion 21b is polished, and the clearance between each reference hole and the peripheral surface is 1/100 to 2/100.
mm. The bolt portion 21c formed at the tip of the shaft portion 21b is formed smaller than the inner diameter of the reference hole H2, and its length is longer than the plate thickness of the floating nut 23. When the positioning bolt 21 is fitted into the reference holes H1 and H2 of the die K and the base holders 12a and 12b, the bolt portion 21c projects from the bottom surface of the recess S.

The torque washer 22 comprises an outer ring 22a and an inner ring 22b. The inner ring 22b is rotatably provided on the inner peripheral portion of the upper end surface of the outer ring 22a in FIG. Outer ring 2
A bearing is incorporated in the circumferential direction between the facing surfaces of 2a and the inner ring 22b. When the head portion 21a of the positioning bolt 21 is pressed against the inner ring 22b and tightened, the outer ring 22a is pressed against the mold surface. Torque washer 22
When the inner ring 22b is tightened, the inner ring 22b
Therefore, the frictional resistance between the outer ring 22a and the die surface does not occur, and the tightening force can be suppressed to, for example, about half that of a normal ring washer. That is, the mold K can be securely fixed with a relatively light force.

As shown in FIG. 7, the floating nut 23 is formed of a metal such as iron in a disk shape, and has a nut groove N fitted in the positioning bolt 21 formed in the central axis direction. For example, the plate thickness is about 10 to 12 mm, and the outer diameter is 30 to
It is set to about 50 mm. Through holes 23h, 23h are formed at positions equidistant from the nut groove N in the diametrical direction, and mounting screws 27, 27 are fitted into the through holes 23h, 23h. As shown in FIG. 1, the mounting screws 27, 27 have a head portion 27a, a shaft portion 27b, and a screw portion 27c formed in the axial direction, and a step surface D1 is formed between the head portion 27a and the shaft portion 27b. Formed, shank 27b
A stepped surface D2 is formed between the screw portion 27c and the screw portion 27c.
When mounting the floating nut 23 in the recess S, the screw portion 27c is tightened in the screw holes of the base holders 12a and 12b until the step surface D2 comes into contact with the bottom surface of the recess S.

Here, the outer diameter of the shaft portion 27b is equal to the through hole 23.
It is formed smaller than the inner diameter of h, and a predetermined play is formed between the outer peripheral surface of the shaft portion 27b and the inner peripheral surface of the through hole 23h. Further, the length of the shaft portion 27b is formed larger than the plate thickness of the floating nut 23, and the step surface D1 and the floating nut 2 are formed.
A play is formed between the end face of No. 3 and the end face of No. 3. Therefore, FIG.
Further, as shown by the arrow in FIG. 7, the floating nut 23 is attached so as to be movable in the horizontal direction, the height direction, and the circumferential direction with this play width. The size of the play width is, for example, 0.5 to the center axis of the reference hole H2.
It is advisable to allow the floating nut to move about 0.7 mm.
This is because when the play width is set to this extent with respect to the clearance between the positioning bolt 21 and the reference hole, the positioning bolt 21 and the floating nut 23 can be fitted smoothly.

Next, an operation method for mounting the mold K will be described. When the mold K is positioned on the table holders 12a and 12b, first, the reference holes H of the table holders 12a and 12b.
The reference hole H1 of the mold K is aligned with the mold 2, and the positioning bolt 21 is inserted into each of the reference holes H1 and H2 via the torque washer 22. Next, as shown in FIG. 6, the bolt portion 21c
When the nut comes into contact with the floating nut 23, the positioning bolt 21 is rotated around the axis. Then, the floating nut 23 slightly moves within the play width range so as to coincide with the rotation axis of the positioning bolt 21, and the bolt portion 21c meshes with the nut groove N. Furthermore, when the positioning bolt 21 is tightened,
The floating nut 23 is tightened to the base holder side, and the base holder 12 and the mold K are fixed between the torque washer 22 and the floating nut 23 while being positioned.

When the mold K is removed from the base holders 12a and 12b, the positioning bolt 21 is loosened with respect to the floating nut 23, and the floating nut 23 is removed from the bolt portion 21c. At this time, the floating nut 23 is prevented from idling by the mounting screw 27. Next, by removing the positioning bolt 21 from the reference holes H1 and H2, the mold K can be removed from the base holder 12 and can be replaced with another mold.

Next, a comparative example is shown in FIG. The rapid mold changer 30 according to the comparative example is one in which the bolts 31 are inserted into the reference holes H1 and H2 of the mold K and the table holder 32, and the nuts 33 are inserted into the recesses S. After inserting the bolts 31 into the reference holes H1 and H2 of the die K and the base holder 12, the head portion 31a is tightened and the nuts 33 are fitted to the bolt portions 31c. According to the configuration of the comparative example, the table holder 3 is replaced every time the mold K is replaced.
It is necessary to turn the hand into the concave portion S on the back surface of 2 to hold the nut 33, and the replacement of the mold K becomes extremely complicated.

In the comparative example shown in FIG. 8, the nut 33 can be fixed to the bottom surface of the recess S by welding or the like in alignment with the central axis of the reference hole H2. It is necessary to match the fixing position of the nut 33 with the same accuracy as or higher than the accuracy of the hole H2, and if the bolt 31 is tightened while the position is misaligned, the tightening becomes hard and the bolt 31 cannot come off. Further, it is possible to continuously form the reference hole H2 and the nut groove within the plate thickness of the base holder 32 without using such a nut 33, but in this case as well, the position of the nut groove is small. Due to misalignment, tightening tends to be firm and quick replacement work becomes difficult.

On the other hand, according to the configuration of the above embodiment,
By inserting the positioning bolt 21 into the reference holes H1 and H2 of the die K and the base holder 12 and rotating them, the floating nut 23 moves and fits along the rotation axis of the positioning bolt 21. It is not necessary to turn the hand to the back side of 12, and the tightening does not become hard. Therefore, the worker can easily and accurately perform the replacement work of the mold K in a short time.

Further, according to the above-mentioned embodiment, since the positioning bolt 21 and the torque washer 22 exert a clamping function, it is necessary to secure a special plate area for clamping the die K. Therefore, the size of the mold K can be reduced. In the case of the conventional example shown in FIGS. 11 and 12, since the positioning pin 4 and the clamp 5 are provided at positions displaced in the front-rear direction, the front-back width of the mold K is formed to be relatively large. According to the configuration, since positioning and fixing can be performed simultaneously by the two reference holes at both ends of the mold K, if the front and rear width of the mold K is secured to be about the size of the outer diameter of the torque washer 22. It is possible to reduce the size of the mold K. Therefore, the manufacturing and handling of the mold can be facilitated,
The burden on the operator can be further reduced. In the case of the above-mentioned embodiment, the reference holes H2 are provided at three places on each side of the table holders 12a and 12b, that is, at six places in total, which is used according to the mold from small size to large size. To do so. If it is a relatively small mold, the reference holes at the center of both sides may be used, and if a relatively large mold is used, it may be placed at four or six corners.
By using the reference holes at all places, the mold can be held more reliably.

Regarding the position of the reference hole H1 formed in the die K, it may be provided so as to correspond to at least one reference hole H2 among the reference holes H2 on both sides of the stand holder. Therefore, the trapezoidal shape of the mold K has a reference hole H.
It is possible to provide the reference hole at a position where stress concentration is most unlikely to occur in the mold K when it is hard to be limited to the position 1 and the mold shape is large and complicated, for example. Further, according to the configuration of the above-described embodiment, since the configuration of the positioning bolt 21 and the floating nut 23 is relatively simple, the number of parts is small compared to the case where the positioning pin and the clamp shown in the conventional example are adopted, and the assembly and processing are performed. And so on,
The manufacturing cost of the device can be suppressed. Further, the positioning bolt 21 and the floating nut 23 can be easily replaced with new ones as needed, and the life of the device such as the base holder can be remarkably improved.

Next, a second embodiment of the present invention is shown in FIGS. Rapid mold changer 40 according to the second embodiment
Is the one in which the floating nut 43 is housed in a housing chamber formed by the recess S1 of the base holder 42 and the cover plate 44. A rectangular recess S1 is formed at a predetermined position on the back surface of the base of the base holder 42, and the floating nut 4 has a predetermined play width in the recess S1.
3 is inserted. A concave portion S2 having a step surface P is formed on the outer peripheral portion of the concave portion S1.
4 are tightly fixed by screws 45. This allows
The floating nut 43 is movable within the storage chamber in the range of the play width in the horizontal direction, the height direction and the circumferential direction. At the time of mounting, when the positioning bolt 21 is inserted into the reference holes H1 and H2 and the tip of the bolt portion 21c is brought into contact with the floating nut 43 and rotated about the axis, the nut groove N of the floating nut 43 rotates the bolt portion 21c. Move along the axis. Next, when the positioning bolt 21 is tightened, the floating nut 43 is prevented from hitting the wall surface of the recess S1 and idling, and is tightened to the side of the base holder 42. Since the other configurations are substantially the same as those in the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted. According to the second embodiment, the operation of exchanging the mold K is facilitated, and since the floating nut 43 is sealed in the storage chamber by the cover plate 44, dust, chips, etc. enter the clearance of the play width. Is reliably prevented. As another embodiment of the present invention,
Ring washers may be used in place of the torque washers of the first and second embodiments. Further, by forming the outer diameter of the head portion of the positioning bolt to be large, it is possible to perform tightening without using a washer.

[0022]

As described above, according to the rapid die changer of the present invention, the positioning bolt is inserted into the reference holes of the base holder and the die, and the floating nut is used for tightening. The positioning and fixing of the mold can be performed quickly and accurately by a simple operation, and the mold replacement work can be facilitated. Further, according to the rapid die changer of the present invention, since the die holder and the die are held by the positioning bolt and the floating nut, and a special clamp is not required, the die can be made small and lightweight. This makes it possible to easily handle the dies such as replacement, transportation and storage, and to significantly reduce the burden on the operator. Further, according to the present invention, since the device configuration is relatively simple and component processing, assembly, etc. can be easily performed,
There is an effect that the manufacturing cost can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view showing a positioning bolt and a floating nut of a rapid mold changing device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a rapid mold changing apparatus according to a first embodiment of the present invention.

FIG. 3 is a perspective view showing a base holder of the rapid mold changing apparatus according to the first embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a rapid mold changing apparatus according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a rapid mold changer according to the first embodiment of the present invention.

FIG. 6 is a partial enlarged cross-sectional view for explaining the operation at the time of fitting the positioning bolt and the floating nut of the rapid mold changing device according to the first embodiment of the present invention.

FIG. 7 is a plan view showing a floating nut of the rapid mold changing apparatus according to the first embodiment of the present invention.

FIG. 8 is a partially enlarged cross-sectional view showing a positioning bolt and a floating nut of a rapid mold changing device according to a comparative example.

FIG. 9 is a partially enlarged cross-sectional view showing a positioning bolt and a floating nut of a rapid mold changing device according to a second embodiment of the present invention.

FIG. 10 is a partially enlarged plan view showing a positioning bolt and a floating nut of the rapid mold changing apparatus according to the second embodiment of the present invention.

FIG. 11 is a perspective view showing a rapid mold changing device according to a conventional example.

FIG. 12 is a perspective view showing a table holder of a rapid mold changing device according to a conventional example.

[Explanation of symbols]

 10 Quick mold changer 12a, 12b Holder 15 Guide pipe 16a, 16b Protective pipe 21 Positioning bolt 21b Shaft 21a Head 21c Bolt 22 Torque washer 23 Floating nut 24 Work guide 25 Bush 27 Mounting screw H1, H2 Reference hole K mold N nut groove S recess

Claims (2)

[Claims] 1. A base holder having a base surface on which a mold is placed, and reference holes for positioning reference holes of the mold at predetermined intervals on the base surface, and a reference for the mold and the base holder. A bolt inserted through the hole, the shaft portion having an outer diameter capable of sliding contact with the reference hole, and a head portion formed at one end of the shaft portion with an outer diameter larger than the inner diameter of the reference hole. And a positioning bolt having a bolt portion formed at the other end of the shaft portion with an outer diameter smaller than the inner diameter of the reference hole, and provided on the back surface of the base holder so that the bolt portion of the positioning bolt can be fitted. And a floating nut attached to the back surface of the base with a predetermined play width in the horizontal direction, the height direction and the circumferential direction. 2. The quick die according to claim 1, wherein a torque washer is inserted into the positioning bolt, and the mold and the base holder are held by the torque washer and the floating nut. Mold changer.