JP3103267B2 - Drilling and expanding device for metal cylindrical work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal cylindrical work drilling and expanding apparatus for drilling a metal cylindrical work and expanding the end of the cylindrical work.

[0002]

2. Description of the Related Art Conventionally, for example, there is a motor frame formed by rolling a steel plate into a cylindrical shape. For example, such a metal cylindrical work is provided with a hole for ventilation,
In addition, to expand the diameter of the end for bracket connection,
In the past, this was done on separate press machines.

[0003]

However, in the case where the drilling and the expanding of the metal cylindrical work are performed by separate presses as described above, the equipment becomes large,
There was a problem that much time was required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to perform drilling and expanding of a metal cylindrical work while saving equipment and time. Another object of the present invention is to provide a metal cylindrical work drilling / diameter expanding apparatus capable of obtaining high precision of the expanded diameter shape.

[0005]

In order to achieve the above-mentioned object, a metal cylindrical workpiece drilling and enlarging apparatus according to the present invention is arranged such that an upper die is provided between a lower die plate and an upper die plate. The plate is provided with a piercing type part that drills a hole in a metal cylindrical work by lowering the plate, and a diametrically expanding part that enlarges the diameter of the end of the work. It is characterized in that it is made to function in order to make a hole and expand its diameter.

[0006] In this case, it is preferable that the perforated mold portion includes a perforated punch and a stripper, and the stripper serves as a bending reference portion of the work when the diameter expanding mold portion functions. or,
Equipped with movable inserts in the work set section where the work is set,
It is preferable that the movable insert is moved by a cam protruding from the large-diameter die so as to make contact with the workpiece at the time of drilling and at the time of diameter molding.

[0007]

According to the above-described means, the metal cylindrical work can be drilled and the diameter can be expanded by a set of press dies. or,
They are performed in the order of drilling and diameter expansion, so that the deformation of the workpiece due to the drilling does not affect the expanded diameter shape.

In this case, in particular, in the case where the punching die portion is provided with a punching punch and a stripper, and the stripper serves as a bending reference portion of the work when the enlarged diameter die portion functions, the punching punch portion is used. The diameter of the workpiece can be accurately expanded using the stripper.

Further, a movable set is provided on a work setting portion for setting a work, and the movable insert is moved by a cam protruding from a large-diameter mold portion so as to be in contact with the work when drilling and expanding. In the case of contact, the setting accuracy of the work can be improved, and the accuracy of drilling and diameter expansion can be improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. First, FIG. 3 shows a lower mold plate 1 and an upper mold plate 2 opposed thereto.
A perforated mold part 3 and an enlarged diameter mold part 4 are provided between them.

Of the two mold portions, the punching mold portion 3 is, in detail, a cylindrical core 5 serving as a work set portion that stands vertically in the center of the lower mold plate 1, and A slide base 7 which is located on the outer periphery of the lower die plate 1 and supported by a plurality of columns 6 and a fixed block 8 which is arranged around the slide base 7 as shown in FIG. , 9 and a movable block 1 arranged to be slidable from the fixed blocks 8, 9 toward the metal core 5 respectively.
0, 11; a punch 12 attached to each core 5 side of the movable block 10; an outer receiving block 13 attached to each core 5 side of the movable block 11; A stripper 15 disposed on the outer periphery of the core block 5 and supported by a fixed block 8 supported by a spring 14; and a punching die 16 mounted on an outer peripheral portion of an upper portion of the cored bar 5 opposite to the punching punch 12 and the outer receiving block 13. A cam 18 attached to the periphery of the lower surface of the upper die plate 2 facing the receiving block 17 and the movable blocks 10 and 11;
It consists of nineteen. Note that the cams 18 and 19 and the movable blocks 10 and 11 have slopes 20 and 2 extending downward, respectively.
1, 22, 23 are formed.

On the other hand, the enlarged diameter mold part 4 is
And an enlarged punch 24 attached to the center of the lower surface of the upper die plate 2, a punch guide rod 25 inserted into the center of the enlarged punch 24, and a peripheral portion of the enlarged punch 24 from the upper die plate 2. It comprises a stripper 27 supported and arranged by a spring 26, a stripper guide 28 for guiding the stripper 27, and a punch guide ring 29 attached to the center of the cored bar 5.

Now, in the above-mentioned configuration, in order to fold the work, a metal cylindrical work (for example, a frame made of a steel plate of a motor) 30 also shown in FIG. Start operation.

Then, the upper plate 2 is moved to the cams 18 and 19.
The cam 18 enters between the fixed block 8 and the movable block 10, and the cam 19 enters between the fixed block 9 and the movable block 11, respectively. 23, and the movable blocks 10 and 11 are moved in the direction of the cored bar 5.

Thus, the movable block 10 applies the stripper 15 and the punch 12 to the work 30, and the movable block 11 applies the outer receiving block 13 to the work 30. The movable block 10 is further advanced from this state. As a result, the punch 12 is stripper 15
Is punched out of the work 30, that is, the hole 31 (FIG. 1)
And enters the punching die 16.

Thereafter, the punch guide rod 25 is connected to the punch expanding ring 24 guided by the punch guide ring 29.
Enters the upper end of the work 30, and expands the diameter of the upper end of the work 30 as indicated by the enlarged diameter portion 32. FIG. 1 shows the state at this time. Particularly, at this time, the stripper 15 is pressed against the work 30 by the spring 14 to support the work 30 and expand the diameter of the work 30 therefrom. Reference numeral 15 denotes a bending reference portion of the work 30.

Thereafter, the upper plate 2 is moved to the cams 18 and 19.
The movable blocks 10 and 11 also return together with the punch 12 and the outer receiving block 13 by the force of a return spring (not shown). FIG. 6 shows the work 30 processed as described above. The work 30 is turned upside down and the above-mentioned processing is performed again to obtain the completed product shown in FIG.

As described above, according to the present structure, a set of press dies can form the hole and expand the diameter of the metal cylindrical work 30. Therefore, such a large-scale structure as that performed by the conventional separate press device can be used. It is possible to achieve a saving of such equipment and time without using a large amount of equipment and a lot of time.

Moreover, in this case, when the work 30 is pierced, the work 30 is slightly deformed. For this reason, if the diameter of the work 30 is expanded before that, the effect of the deformation due to the drilling of the work 30 appears in the expanded shape, however, in the case of this configuration, the drilling is performed first. And then expand the diameter.
The effect of the deformation of the work 30 due to the drilling does not affect the expanded diameter shape, and the expanded diameter shape can be obtained with high accuracy.

Further, in the case of this structure, the perforated mold 3
However, since the punch 30 and the stripper 15 are provided, and the stripper 15 serves as a bending reference portion when the diameter of the work 30 is expanded, the diameter of the work 30 can be accurately expanded. This has the further effect of being able to be performed using the stripper 15 for the opening punch 12.

8 and 9 show a different embodiment of the present invention.
A movable insert 33 which is positioned inside and can move radially outward of the cored bar 5 is provided, and the movable insert 33 is supported by the enlarged punch 24 of the enlarged die 4 and supported by a spring 34 so as to protrude therefrom. The workpiece 3 is moved by the cam 35 when drilling and expanding.
FIG. 1 shows a structure in which the contact is made from 0 to the inside. In this case, the setting accuracy of the work 30 can be improved, and thus the accuracy of drilling and diameter expansion can be improved.

When the workpiece 30 is punched, the punching load by the cam 18 acts on the metal core 5 as a force for tilting the metal core 5. In particular, when the plate thickness of the work 30 is large or when the perimeter of the hole 31 to be drilled is long, the drilling load becomes large, and the tendency becomes remarkable. Then, if the inclination of the core metal 5 becomes large due to them, the punch 12
The clearance between the hole 30 and the punching die 16 is not maintained at an appropriate amount, so that "burrs" are generated on the work 30 and the mold is damaged.

On the other hand, in the above configuration, the movable insert 33 abuts the work 30 from the inside, and the outer receiving block 13 receives the work 30 on the outside. The inclination of the cored bar 5 as described above is suppressed by being positioned on the substantially opposite side of the punch 12. Therefore, the clearance between the punch 12 and the die 16 can be maintained at an appropriate level, and it is possible to prevent the burrs from being generated on the work 30 and the mold from being damaged.

The work 30 may be other than a motor frame. In addition, the present invention is not limited to the embodiment described above and shown in the drawings, and can be implemented with appropriate modifications without departing from the scope of the invention.

[0025]

EFFECT OF THE INVENTION Drilling of the metal cylindrical work of the present invention
The diameter expanding device is as described above, and has the following effects. First, a lowering die plate is provided between a lower die plate and an upper die plate to form a hole in a metal cylindrical work, and an expanding die for expanding the diameter of the end of the work. The diameter and the diameter of the cylindrical workpiece are increased by making them function in the order from the drilling part to the diameter-enlarging part so as to drill and expand the diameter. This can save time and increase the accuracy of the expanded shape.

Secondly, the above-mentioned perforated mold portion is provided with a perforated punch and a stripper, and the stripper serves as a bending reference portion of the workpiece when the enlarged diameter portion functions.
The diameter of the workpiece can be accurately expanded using a stripper for punching. Third, a movable set is provided on a work setting portion for setting a work, and the movable insert is moved by a cam protruding from a large-diameter die to abut on the work when drilling and expanding. With this configuration, the setting accuracy of the work can be improved, and the accuracy of drilling and diameter expansion can be improved.

[Brief description of the drawings]

FIG. 1 is an overall longitudinal sectional view of a working state showing an embodiment of the present invention.

FIG. 2 is a plan view of the perforated mold portion in the same state.

FIG. 3 is an overall vertical sectional view of a state before processing.

FIG. 4 is a plan view of the perforated mold portion in the same state.

FIG. 5 is a front view of a state before processing of the workpiece.

FIG. 6 is a front view of a half-finished work state of a workpiece.

FIG. 7 is a front view showing a state in which all machining of the workpiece is completed.

FIG. 8 is a view corresponding to FIG. 3, showing a different embodiment of the present invention.

FIG. 9 is a diagram corresponding to FIG. 1;

[Explanation of symbols]

1 is a lower mold plate, 2 is an upper mold plate, 3 is a perforated mold part, 4 is an enlarged diameter mold part, 5 is a metal core (work set part), 10
Is a movable block, 12 is a punch, 15 is a stripper, 16 is a punch die, 18 is a cam, 24 is a large diameter punch, 30 is a work, 31 is a hole, 32 is a large diameter portion, 33 is a movable insert, Reference numeral 35 denotes a cam.

Claims (3)

(57) [Claims] 1. A method according to claim 1, wherein the lower plate and the upper plate are
The upper die plate is lowered to provide a drilling part that drills a hole in a metal cylindrical work, and a diameter expanding part that expands the diameter of the end of the work, and expands them from the drilling part. An apparatus for drilling and expanding metal cylindrical workpieces, which functions in the order of a mold portion to perform drilling and diameter expansion. 2. The metal cylindrical shape according to claim 1, wherein the punching die portion includes a punching punch and a stripper, and the stripper serves as a bending reference portion of the workpiece when the diameter expanding die portion functions. Drilling and expanding device for work. 3. A work setting part for setting a work is provided with a movable insert, and the movable insert is moved by a cam protruding from a large-diameter die to impinge on the work when drilling and expanding. 2. The apparatus for drilling and expanding a metal cylindrical workpiece according to claim 1, wherein the apparatus is brought into contact with the workpiece.