JPH0450975Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a pre-trimmed type scrap cutter.

[Conventional technology]

Conventionally, a normal trimming type wedge-shaped (T-shaped) scrap cutter 40 shown in FIG.
As can be seen from FIG. 5, the cutting edge 10 of the scrap cutter 40 is horizontally formed.

The reference numeral 8 in FIG. 4 is a workpiece such as a thin steel plate, the reference numeral 3 in FIG. 5 is a punch, and the reference numeral 2 is a cutting edge of the punch 3.

[Problem that the invention attempts to solve]

However, in the normal wedge-shaped (T-shaped) scrap cutter 40 as shown in FIGS. 4 and 5, as the circumference of the scrap increases, the scrap tends to shift outward in the direction away from the punch 3. As shown in the figure, the scrap 9a to be cut is displaced from the already cut scrap 9b, and the scrap 9a may not be completely cut.

In addition, as shown in Fig. 7, the circumference of the scrap 9 increases and a gap is created between the scrap 9 and the punch 3, and the scrap is not secured to the jaws 13 formed on the punch, so the scrap 9 tends to lift up. .

Therefore, in order to solve these problems, this idea is to improve the structure of the cutting edge line of the scrap cutter to prevent incomplete cutting and lifting of the scrap due to misalignment of the trimmed scrap. .

[Means for solving problems]

Therefore, this invention attempts to solve the above-mentioned problems by forming an inclined cutting edge on the cutting edge of the scrap cutter near the punch side.

More specifically, a punch 3 having a cutting edge 2 is fixed to the lower mold 1, a scrap cutter 4 is fixed to the punch 3, and a scrap cutter 4 is fixed to the punch 3. A jaw portion 13 is formed at a position higher than the cutting edge line of the press ram, and a die 7 is fixed to the upper mold 6. A workpiece 8 whose outer circumference is to be trimmed is set on the punch 3, and the press ram is placed at the bottom dead center. In a pre-trimming type scrap cutter configured to cut the scrap 9 by pressing the scrap 9 of the work 8 against the scrap cutter 4 using the die 7 of the upper mold 6, the cutting edge line of the portion of the scrap cutter 4 close to the punch 3 side In part 10,
Slanted cutting edge portion 11 that slopes diagonally downward toward the punch 3 side
The width of the inclined cutting edge portion 11 is larger than the width of the scrap 9 cut off from the workpiece 8.

[Effect]

According to the above-mentioned means, since the inclined cutting edge part 11 that is inclined diagonally downward toward the punch 3 side is formed on the cutting edge ridge line part 10 of the scrap cutter 4 in a portion close to the punch 3 side, the scrap cutter 4 is not separated from the workpiece 8. The scrap 9 that has been removed exerts a horizontal component force P (third
Therefore, the scrap 9 is prevented from shifting outward in the direction away from the workpiece 8, and the scrap 9 is twisted and bent by the scrap cutter 4, and is bitten by the punch 3. Scrap 9 is jaw part 1 of punch 3
3 to prevent the scrap 9 from lifting up.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

The drawings from FIG. 1 to FIG. 3c show an embodiment of this invention, and as can be seen from FIG.
A punch 3 having a cutting edge 2 is fixed to the lower die 1 by a fixing means (not shown), and a wedge-shaped (T-shaped) scrap cutter 4, the outer shape of which can be clearly seen in FIG. 2, is fixed to the punch 3. It is fixed by device 5. Furthermore, a jaw portion 13 is formed on the punch 3 between the cutting edge line of the scrap cutter 4 and the position where the workpiece 8 is trimmed.

In addition, a die 7 is fixed to the upper die 6,
The die 7 of the upper mold 6 at the bottom dead center of the press ram
The cutting edge 2 of the punch 3 is used to trim the outer periphery of a work 8 such as a thin steel plate set on the punch 3.

Further, the trimmed scrap 9 of the workpiece 8 is sandwiched between the die 7 and the scrap cutter 4, so that the trimmed scrap 9 is attached to the cutting edge 10 of the scrap cutter 4 by the descending die 7. When pressed, the scrap 9 is cut.

In the cutting edge 10 of the scrap cutter 4, in a portion close to the punch 3 side,
As can be clearly seen from FIG. 1, the cutting edge 10 is formed into an inclined cutting edge 11 that is slightly inclined diagonally downward toward the punch 3 side within a range less than the thickness of the scrap 9.
The width of the scrap 9 is larger than that of the scrap 9 to be cut off from the work 8.

The inclined cutting edge 11 of the scrap cutter 4 prevents the scrap 9 to be cut from shifting outward in the direction away from the punch 3.

Note that the reference numeral 12 in FIG. 1 is a stripper.

This invention is constructed as described above, and the workpiece 8 whose entire outer periphery is to be trimmed is set in the punch 3 fixed to the lower mold 1.

Next, the outer periphery of the workpiece 8 is trimmed by lowering the die 7 fixed to the upper mold 6.

At this time, the trimmed scrap 9 is closed and is located on the outer periphery of the punch 3 as shown in FIG.

Then, at the bottom dead center of the press ram, the scrap 9 is pressed against the inclined cutting edge 11 of the scrap cutter 4 by the die 7.
dig into it.

Note that two or more scrap cutters 4 are attached to the outer periphery of the punch 3.

Here, the cutting edge 10 of the scrap cutter 4 is
The scrap cutter 4 is formed with the inclined cutting edge 11 that is inclined diagonally downward toward the punch 3 side and whose width is larger than the width of the scrap 9.
A horizontal component force P acts on the upper scrap 9 toward the punch 3 side, and the scrap 9 bites toward the punch 3 side. Even when the die 7 is raised, the scrap 9 is retained by the jaw 13 of the punch 3 and therefore does not rise.

In this way, the scrap 9 has not yet been cut and separated in the first processing.

Then, by the second and subsequent processing, a new scrap 9b is generated on top of the scrap 9a shown in FIG. 3a.

The new scrap 9b is pressed downward by the die 7, and as shown in FIGS. 3a to 3b,
The scrap 9a is further bitten into the inclined cutting edge 11 of the scrap cutter 4.

At this time, the scrap 9a receives a horizontal component P of the cutting force in the direction (inward) of the punch 3 by the inclined cutting edge 11 of the scrap cutter 4, as seen in FIG. be forced to.

Further, the scrap 9b above the scrap 9a to be cut is twisted and bent inward in the direction of the punch 3, so that the scrap 9b is bent inward in the direction of the punch 3.
They become greedy towards others.

Furthermore, as shown in FIG. 3c, the scrap 9a is completely cut off at the bottom dead center of the press ram, the scrap 9b becomes a new scrap 9a, and the cutting of the scrap 9 is repeated.

[Effect of idea]

As mentioned above, this device forms an inclined cutting edge on the cutting edge of the scrap cutter near the punch side, which is inclined diagonally downward toward the punch side and is larger than the width of the scrap cut from the workpiece. Therefore, due to the inclination of the slanted cutting edge of the cutting edge of the scrap cutter, the scrap to be cut receives a force in the horizontal direction and is prevented from shifting outward. There is no misalignment between the scrap and the scrap to be cut, and normal cutting is performed.

Further, the scrap to be cut for the first time is twisted due to the inclination of the inclined cutting edge portion, and as a result of being bent slightly, the scrap to be cut for the first time is bent with respect to the horizontal plane, and comes to bite against the punch. Therefore, the scrap is locked to the jaw of the punch, and the scrap is prevented from lifting up.

[Brief explanation of the drawing]

The drawings from Fig. 1 to Fig. 3c show an embodiment of this invention, in which Fig. 1 is a drawing showing the overall configuration of the trimming press, Fig. 2 is a view taken in the direction of the arrow in Fig. 1, and Fig. 3 is a drawing showing the overall configuration of the trimming press. Each of the drawings from a to 3c is a partially enlarged view showing the process of cutting a scrap with a scrap cutter, and the drawings from Fig. 4 to 7 show a conventional example, and Fig. 4 shows a T-shaped scrap cutter. 5 is a perspective view showing the relationship between the scrap cutter and the punch in FIG. FIG. 1...lower die, 2...cutting blade, 3...punch, 4...
...Scrap cutter, 6...Upper die, 7...Dice, 8...Work, 9...Scrap, 10...
Cutting blade ridge line part, 11... Inclined cutting blade part, 12... Jaw part.

Claims (1)

[Scope of utility model registration request] A punch with a cutting blade is fixed to the lower die, a scrap cutter is fixed to this punch, a jaw is formed on the punch at a position higher than the cutting edge line of the scrap cutter, and a die is fixed to the upper die. In the press-trimming type device, the workpiece whose outer periphery is to be trimmed is set on the punch, and the scrap of the workpiece is pressed against the scrap cutter by an upper die at the bottom dead center of the press ram to cut the scrap. A slanted cutting edge that slopes diagonally downward toward the punch side is formed on the ridgeline of the cutting edge in a portion close to the punch side, and the width of the slanted cutting edge is larger than the width of the scrap cut off from the workpiece. A pre-trimming type device characterized by: