JPH0371926B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a processing method and apparatus for continuously punching a workpiece material using a punch press machine.

[Prior Art] A punch press machine is used to punch holes in a workpiece material.

This punch press machine performs 340 punching operations per minute, making it a fast processing machine, and is a commonly used processing machine for punching and shearing workpiece materials.

[Problems to be Solved by the Invention] However, for example, when punching a long and narrow hole in a workpiece, the hole cannot be punched in one punching operation, and the hammer must be moved back and forth while sequentially moving the workpiece. It is necessary to perform punching operations continuously while moving.

In this case, since the second hole is drilled in succession to the hole drilled in the first punching operation, a seam is created between the hole formed by the first punching and the hole formed by the second punching due to the difference in plastic deformation.

The force applied to this seam is different between each part punched with a punch and die and the linear part, resulting in a difference in plastic deformation, but generally speaking, the precision of the punch press machine is Although it is not a practical problem due to its high price, it has the disadvantage that the presence of seams can be visually recognized from the reflection of light, which impairs the aesthetic appearance.

Conventionally, these joints were polished with a file or the like to keep the aesthetics intact, but the above-mentioned defects could not be completely removed and polishing was time-consuming.

Therefore, an object of the present invention is to provide a new seamless continuous punching method and apparatus.

[Means for solving the problem] Therefore, the continuous punching method of the first invention is as follows:
A predetermined part of the workpiece material is punched out leaving a part surrounding it, and then the tip of the punched part is cut off as a small piece.After that, the cut predetermined part of the workpiece material is cut off. It is characterized in that it is moved relatively in a predetermined direction, and by the impact of the next stroke of the hammer, it is connected to the cutting location, and new punching operations and cutting operations are repeated and processed continuously.

Further, in order to perform the above-mentioned processing operation, in the continuous punching device of the second invention, the punch attached to the press body has a punching blade having a blade surface at a predetermined angle;
A cutting blade is provided slidably adjacent to the punching blade and has a blade surface flush with the blade surface of the punching blade, and a die paired with the punch is provided with a cutting blade that is slidably provided adjacent to the punching blade. It is characterized in that a stepped portion is formed at the boundary between the abutting portion and the abutting portion of the cutting blade.

[Example] Examples of the processing method and apparatus of the present invention will be described below based on the drawings.

FIG. 1 is a perspective view of the overall structure of a punch press machine used in the present invention.

In FIG. 1, a punch press machine main body 1 supports a planar fan-shaped turret table 1a rotatably around the center of the fan shape, and a plurality of pairs of punches 3 and dies 6 are mounted on the turret table 1a at a constant rate. They are placed opposite each other with a gap of .

Further, a hammer 2 is provided in the punch press main body 1 so as to be located above the head of the punch 3.

On the other hand, a positioning device 5 is installed in front of the punch press main body 1 to move the workpiece 10 in the X-axis direction and the Y-axis direction. A movable carriage 5a is installed in this positioning device 5, and a workpiece material 10 is fixedly supported on this carriage 5a.

The workpiece material 10 is moved to a predetermined position by a carriage 5a movably installed in the positioning device 5, and in this state, the fan-shaped turret table 1a rotates.

In connection with this, a predetermined punch 3 and die 6 are arranged so as to sandwich the hole-drilling position of the workpiece material 10.
Here, when the hammer 2 provided on the punch press main body 1 hits the head of the punch 3, a predetermined hole is made in the workpiece material 10.

This drilling operation will be explained based on FIG.

FIG. 2 is a process diagram showing the steps of the processing method of the first invention.

In FIG. 2, reference numeral 10 denotes a workpiece material to be drilled, and above the workpiece material 10, a blade 20 provided on the punch 3 for making holes is arranged.

This blade 20 is composed of two punching blades 21 and a cutting blade 22 which are adjacent to each other.

FIG. 2a shows how the blade 20, which has been struck by a hammer provided on the press body, moves toward the workpiece material 10 and descends. During this descending stage, the punching blade 21 and the cutting blade 22 are moving in unison.

As the blade 20 further descends and hits the workpiece material 10, the blade 20 has a predetermined shear angle θ with respect to the workpiece material 10 as shown in FIG. Unfinished part 10a
It is punched out in a U-shape, leaving a part of it. Note that this punching operation may be performed not only in a U-shape but also in an L-shape. In short, it is sufficient that a portion remains uncut so that a half blank punching operation can be performed.

This uncut portion 10a is formed by the die 6 disposed below the workpiece 10 so that the lower end of the cutting blade 22 does not advance below the lower surface of the workpiece 10. Therefore, the U-shaped punched portion 11 is bent along the uncut portion 10a.

However, as shown in FIG. 2c, the punching blade 21 moves further downward, so that the tip of the punched portion 11 is punched out as a small piece 11a. When the punching out of the small piece 11a is completed, the punching blade 21 and the cutting blade 20 rise together as shown in FIG. 2d and leave the workpiece material 10.

The steps up to this point are performed during one stroke of the hammer.

Here, the workpiece material 10 is moved relative to the blade 20 by a positioning device (not shown), and as shown in FIG. The operations illustrated in Figure d are performed.

FIG. 2f shows that the cutting and punching operations are repeated in this way to form a strip-shaped long hole 1 in the workpiece material 10.
2 shows the final stage of formation. As shown in the figure, when forming a strip-shaped elongated hole 12 in a workpiece material 10 by the processing method of the present invention, the rearmost end of the hole to be formed is moved by a punch 3 by a mold rotating device (not shown). Then, the die 6 is rotated 180°, cut and punched in the opposite direction, and then punched out continuously from the leading edge to form a band-shaped hole 12.
form.

Next, an embodiment of an apparatus, which is the second invention, used to carry out the above-mentioned punching method will be described.

FIG. 3 is a partially cutaway perspective view showing the first embodiment of the processing apparatus, and FIG. 4 is an exploded perspective view of the main parts thereof.

As shown in FIG. 3, the punch 3 is housed and held inside a hollow cylindrical punch holder 4 having a flange 41 attached to the upper end thereof, and is adjusted by a support bolt 42 so as not to shift.

The punch holder 4 is fixed by a disc spring 50 interposed between the flange 41 and the punch head 31 attached to the head of the punch 3.
A biasing force against pressing is applied to the punch 3 which is slidably moved inside.

As shown in FIG. 4, this punch 3 has a first mold 3 equipped with a punch head 31 and a punching blade 21.
2. It has a second mold 33 equipped with a cutting blade 22.

Among these, the first mold 32 is made by cutting a cylindrical steel material, and the diameter increases from the middle. A punching blade 21 in the shape of a rectangular parallelepiped having a predetermined shear angle θ (for example, about 5° in the case of a 2 mm aluminum steel plate) is provided on one side of the lower tip of the cylindrical body. The semicircular portion below the center is cut out and has a predetermined step with respect to the punching blade 21.
Two screw holes 32b for screwing the support rod 34 are formed in the cut-off portion 32a where the diameter becomes thicker at the center.

The second mold 33 is obtained by cutting a cylindrical body having a dimension shorter than the length of the punching blade 21, and is used to slidably guide the punching blade 21 to the right semicircular portion of the cylindrical body. A rectangular guide hole 33a is formed, and a rectangular cutting blade 22 having a predetermined shear angle θ is projected from the tip of the left semicircular portion.
On both sides of this protruding cutting blade 22, there are support rods 3.
Two through holes 33b are formed to penetrate through the holes 33b.

The first mold 32 and the second mold 33 are combined as follows. That is, the punching blade 21 protruding from the first mold is combined so as to slide within the guide hole 33a formed in the second mold. The punching blade 21 has two support coil springs 3 attached to a cut-off portion 32a formed in the first mold.
The two rod-shaped support rods 34 are inserted from below the second mold 33 through the through holes 33b formed in the first mold 33 and the support springs 35. Insert, first mold 3
screw into the screw hole 32b formed in 2.

Furthermore, a disk-shaped punch head 31 having a diameter slightly larger than the radius of the upper surface is placed on the upper surface of the first mold 33. The punch head 31 has a bolt hole 31a formed in the punch head 31 and a screw hole 31c formed in the upper surface of the first mold 32.
by screwing with the screw 36.
It is fixed in the mold 32 of.

In the punch 3 assembled in this way, the punching blade 21 is slidably fitted into the guide hole 33a. Therefore, the cutting blade 22 is guided by the guide hole 33a, and the right side of the cutting blade 22 slides on the left side of the punching blade 21, so that it can freely slide up and down with respect to the punching blade 21. In addition, the supporting coil spring 3
Due to the biasing force 5, the blade surface of the cutting blade 22 and the blade surface of the punching blade 21 are positioned in a straight line when no force is applied.

In this first embodiment, since the punching blade 21 is guided to the guide hole 33a formed in the second mold 33, the positional relationship between the first mold and the second mold does not shift. There are advantages.

The second embodiment is shown in a partially cutaway perspective view in FIG. 5 and an exploded perspective view of main parts in FIG. 6.

In the second embodiment, as shown in FIG.
The mold 33 is not a cylindrical body with a cutting blade 22 and a guide hole 33a formed therein as in the first embodiment, but a cylindrical body with a semicircular cross section obtained by vertically splitting the right half of the cylindrical body. It has become a thing of the past.

Then, the vertically divided cut surface is brought into contact with the cut surface of the cut-off portion 32a formed in the first mold 32, and the first mold 3 is moved by the surrounding punch holder 4.
2 and the second mold 33 are pressed so that their positional relationship does not shift.

This second embodiment has the advantage that the second mold 33 is easy to manufacture.

Note that throughout the first and second embodiments, the punching blade 2
1 and the cutting blade 22 have a rectangular cross section, but this need not necessarily be the case; for example, the four corners of the rectangle may be rounded to form an arc.

On the other hand, the die 6 that is paired with the punch for processing the workpiece material is the same throughout the first and second embodiments, and as shown in FIGS. 4 and 5, a punching blade is attached to the base 61. The part that 21 contacts and the cutting blade 2
Rectangular recesses 61a and 61b are formed in the contact areas of the punching blades 21 and the cutting blades 22 in accordance with the cross sections of the punching blades 21 and the cutting blades 22.
was formed.

Of the recesses 61a and 61b, the recess 61a in the part that the punching blade 21 contacts is deeper than the recess 61b in the part that the cutting blade 22 contacts, and there is a step 6 at the boundary between the recess 61a and the recess 61b.
a is formed.

In this case, there is no need to limit the shape of the recesses 61a, 61b themselves, as long as the stepped portion 6a at the boundary portion is formed.

Further, the shape of the base 61 itself does not have to be a cylinder as shown in the figure, but may be any shape as long as it can form the recesses 61a and 61b.

Next, the operation of the punching device according to the second invention will be explained based on the operation diagram shown in FIG. 7.

FIG. 7a to FIG. 7b show the steps in which the punching device punches and cuts the workpiece material 10.

FIG. 7a shows a state in which the hammer (not shown) provided on the press body has not yet struck the punch 3. In this state, the disc spring 50 and the supporting coil spring 35 are fully extended, and the punching blade 21 is fully extended. The blade surfaces of the cutting blade 22 and the cutting blade 22 are located on the same straight line.

Here, as shown in FIG. 7b, when a hammer (not shown) hits the head of the punch head 31, the disk spring 50
gradually shrinks and the punch 3 descends. As a result, the blade surfaces of the punching blade 21 and the cutting blade 22 come into contact with the surface of the workpiece material 10.

In this state, no external force is applied to the blade surfaces of the punching blade 21 and the cutting blade 22, so the punching blade 21
and the cutting blade 22 are moving integrally.

Proceeding further, the punch 3 descends as shown in FIG.
Since the spring constant of the supporting coil spring 35 is large, the supporting coil spring 35 does not contract during the process until the punching blade 21 and the cutting blade 22 come into contact with the bottom of the punching blade 21 and the cutting blade 22 move together. Based on this integral movement, the workpiece material 10 is cut into a U-shape leaving an uncut portion 10a, and the cut portion 11 is gradually bent along the uncut portion 10a.

After that, as shown in FIG. 7d, the cutting blade 22
1 hits the bottom of the recess 61b of the die 6 and no longer descends, and the support coil spring 35 gradually contracts. At this time, the punching blade 21 further descends, and at this stage of descent, a part of the U-shaped punched part 11 is punched out as a small piece 11a, and after the punch 3 reaches the bottom dead center, the disc spring is released. Punch 3 rises due to the urging force of 50.

The processes shown in FIGS. 7a to 7d are performed during one stroke of the hammer provided in the press body.

[Effects of the Invention] As explained above, according to the processing method of the present invention, a workpiece material is punched out leaving a part surrounding a predetermined part, and then the tip of the punched part is cut off as a small piece. , the punching operation and cutting-off operation are performed while continuously moving the workpiece material in series with the punching point, and continuous punching is performed while cutting off the punched portion as small pieces. Seams due to the difference between plastic deformation of each part and straight parts that occur in the straight parts are eliminated, and the aesthetic appearance is not impaired. Moreover, since the punched parts are cut off into small pieces one after another, punching can be performed continuously at high speed, regardless of the size of the processed parts.

Further, according to the processing device of the present invention, the cutting blade and the punching blade, which are flush with each other and have a predetermined angle, are provided in one punch so that they can slide freely relative to each other, so that one stroke of the hammer During striking, cut the workpiece material leaving a part surrounding a predetermined location,
Subsequently, a portion of the punched area can be punched out as a small piece, and an effect similar to that of continuously and smoothly cutting the workpiece material using shearing can be achieved.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the overall structure of a punch press machine, Figures 2a to 2f are process diagrams showing the steps of the continuous punching method of the first invention, and Figures 3 and 4 are A partially cutaway perspective view and an exploded perspective view of the main parts of the first embodiment of the continuous punching device of the second invention, and FIGS. 5 and 6 show the first embodiment of the continuous punching device of the second invention. FIG. 7 is a partially cutaway perspective view showing the second embodiment and an exploded perspective view of its essential parts, and FIG. 7 is an operation diagram showing the processing operation of the continuous punching apparatus of the second invention. 1...Punch press machine body, 2...Hammer, 3
... Punch, 5 ... Positioning device, 6 ... Die,
6a...Step part, 10...Work material, 10a...
...Uncut part, 11...Cut part, 20...
Blade, 21...Cutting blade, 22...Punching blade, 32...
...first mold, 33...second mold.

Claims (1)

[Scope of Claims] 1. A hammer 2 provided in a press body 1; a pair of punches 3 and a die 6 for processing a workpiece material 10; a workpiece disposed between the punch 3 and the die 6; In the continuous punching method of performing continuous punching on the workpiece material 10 using a positioning device 5 that moves and positions the workpiece material 10, a predetermined location of the workpiece material 10 is punched by one stroke of the hammer 2. Then, the tip of the punched part is cut off as a small piece 11a, and then the positioning device 5 moves the workpiece material 1
The cut predetermined part of the cut part 0 is relatively moved in a predetermined direction, and the next stroke of the hammer punches out the cut part, leaving a part so as to connect with the cut part and surrounding another predetermined part. A continuous punching method characterized by performing continuous punching on a workpiece material by repeating the operation of cutting off the tip of a point as a small piece. 2. A hammer 2 provided in the press body 1; A pair of punches 3 and a die 6 for processing a workpiece material 10; Moving the workpiece material 10 disposed between the punch 3 and the die 6; In a continuous punching device that continuously performs punching using a positioning device 5 for positioning; the punch 3 has a punching blade 21 having a blade surface at a predetermined angle; and a punching blade adjacent to the punching blade. The die 6 includes a portion corresponding to the punching blade of the punch and a cutting blade 22 having a blade surface flush with the blade surface of the punching blade. A continuous punching device characterized in that a stepped portion 6a is formed at the boundary with a portion corresponding to a cutting blade.