JPH0739452Y2 - Press type structure for punching - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a press-type structure capable of perforating a panel arranged in an inclined shape.

(Prior Art and Problems Therefor) Conventionally, for example, a punch die as shown in FIG. 2 has been used to perforate a panel, and a punch 3 attached to an upper die 1 via a punch holder 2 in a hanging shape. As opposed to
A panel P is attached to the upper surface side of the lower die 4 via a pressing pad 5, and the panel P has an inclined surface Pa.
The punch 3 is used to punch holes in Pa. still,
Reference numeral 6 in the drawing denotes a button die attached to the lower mold 4.

In such a conventional press type structure, the lower end surface of the punch 3 slides on the inclined surface Pa of the panel P at the time of punching, the gap between the punch 3 and the lower die 4 becomes large, and burrs occur. In addition, since there is a difference between the inner diameter of the pad hole 5a of the pressing pad 5 and the diameter of the punch 3, the panel P is stretched by being pulled by the punch 3 and burrs are likely to occur.

(Means for Solving the Problems) The present invention has been devised in view of the above-mentioned conventional problems, and an object thereof is not to provide a press-type structure capable of suppressing the occurrence of burrs. In a press die in which a panel is sandwiched between a lower die and a pressing pad in an inclined manner with respect to a horizontal plane, and a punch attached to the upper die in a hanging manner is used to punch a hole in an inclined surface of the panel, a tip surface of the punch. Is formed in an inclined shape that matches the inclination angle of the inclined surface of the panel, and a sub pad for pressing the inclined surface of the panel is detachably provided in the lower portion of the pressing pad, and the pressing pad is attached to the sub pad. That is, a punch escape hole for punch insertion having a smaller inner diameter than the pad hole for punch insertion and slightly wider than the outer diameter of the punch is formed.

(Operation) Since the tip end surface of the punch is formed in an inclined shape corresponding to the inclined surface of the panel, the punch does not slip on the inclined surface of the panel, and the occurrence of burrs is reduced accordingly.
Also, since the hole diameter of the subpad is close to the punch diameter, the panel is less likely to be pulled by the punch, and the panel is satisfactorily held by the subpad and does not extend, and burrs do not occur.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment, in which the same components as those of the conventional structure shown in FIG. 2 are designated by the same reference numerals.

A punch 3 is attached to an upper die 1 forming a press die in a hanging shape. In this example, the lower end surface of the punch 3 is an inclined punch tip surface 3a. This punch tip surface
The inclination angle of 3a is the same as the inclination angle of the inclined surface Pa of the panel P sandwiched between the lower mold 4 and the pressing pad 5. Therefore, when the upper die 1 is lowered and the punch tip surface 3a of the punch 3 contacts the inclined surface Pa of the panel P,
The punch tip surface 3a comes into full contact with the inclined surface Pa of the panel, and slipping does not occur.

On the other hand, at the lower part of the pad hole 5a for inserting the punch of the pressing pad 5, a sub-pad 7 is detachably attached to the lower part of the pad 5 to facilitate the exchange of the punch. The sub pad 7 is pressed against the lower mold 4 to hold the panel P between the lower mold 4. The sub pad 7 has a punch escape hole 7a smaller than the pad hole 5a formed in the pressing pad 5, and the punch escape hole 7a is formed to have an inner diameter slightly wider than the outer diameter of the punch 3. During this period, when the punch 3 descends to make a hole in the inclined surface Pa of the panel P, the periphery of the inclined surface Pa of the panel P is firmly pressed to prevent the panel P from being displaced or extended. Can be suppressed.

As described above, in this example, the punch tip surface 3a is formed in an inclined shape, and the punch escape hole 7a is formed to have an inner diameter slightly wider than the outer diameter of the punch 3, so that when the hole is formed in the panel P, The punch 3 does not slip, and even if the panel P is pulled by the punch 3, since the punch escape hole 7a has a narrow inner diameter, the panel P does not extend, and a synergistic effect between the two may cause burrs on the panel P. In addition, a favorable drilling process is performed on the inclined surface Pa.

(Effect of the Invention) According to the present invention, a panel is sandwiched between a lower die and a pressing pad in an inclined manner with respect to a horizontal plane, and a punch attached to the upper die in a hanging manner is used to punch a hole in the inclined surface of the panel. In the press die, the tip end surface of the punch is formed into an inclined shape that matches the inclination angle of the inclined surface of the panel, and a sub pad for pressing the inclined surface of the panel can be attached to and detached from the lower portion of the pressing pad. Provided, in the subpad,
By forming a punch escape hole for punch insertion, which is narrower than the punch hole for punch insertion of the pressing pad and slightly wider than the outer diameter of the punch, there is no slip of the punch at the time of punching, and Therefore, the expansion of the panel is eliminated, and there is an effect that burring does not occur in the panel and favorable drilling can be performed. In addition, the sub pad can be attached and detached, and the punch can be easily replaced.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a sectional view showing the principal part of the first embodiment, and FIG. 2 is a sectional view showing the conventional structure. 1 …… Upper die, 3 …… Punch 3a …… Punch tip surface, 4 …… Lower die 5 …… Pressing pad, 6 …… Button die 7 …… Sub pad, 7a …… Punch escape hole P …… Panel, Pa ... Slope

Claims (1)

[Scope of utility model registration request] 1. A panel P is sandwiched between a lower die 4 and a pressing pad 5 in an inclined manner with respect to a horizontal plane, and a punch 3 attached to the upper die in a hanging manner is used to punch a hole in an inclined surface Pa of the panel P. In the press die for performing the above, the tip surface 3a of the punch 3 is
Is formed in an inclined shape that matches the inclination angle of the inclined surface Pa of the panel P, and a sub-pad 7 that presses the inclined surface Pa of the panel P is detachably provided below the presser pad 5. The press pad 5 is attached to the sub pad 7.
Punch hole for punch insertion, which is narrower than the pad hole 5a for punch insertion and is slightly wider than the outer diameter of the punch 3.
A press-type structure for punching, characterized in that 7a is formed.