JP2909714B2 - Dies for drilling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching machine which is mounted on a punching machine and is used to make a hole in a metal material such as a shape steel.
nch) and a die used in combination therewith.

[0002]

2. Description of the Related Art As shown in FIG.
The upper surface 3 of the blade 2 was a plane orthogonal to the center axis of the punch 1. Also, as shown in FIG. 7, the mounting surface 5 of the die 4 on which the workpiece is mounted was also a plane orthogonal to the centripetal axis of the die 4. For this reason, in the drilling process of punching out the workpiece with a strong force by the punching machine, burrs are easily generated and the workpiece is easily deformed, and an unpleasant impact sound is generated.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to minimize occurrence of burrs and deformation of a workpiece during drilling with a punch and a die.

[0004]

According to a die of the present invention, a ring-shaped inner slope is provided at an upper end of a punched hole to be inclined down to an outer edge of the die, and an outer edge of the inner slope is directed to an outer edge of the die. It is characterized in that a ring-shaped outer slope which is inclined upward is provided.

[0005]

1 to 3 show a punch 11 paired with a die according to the present invention. Reference numeral 12 denotes a mounting portion to a punching machine (not shown), and reference numeral 13 denotes a column-shaped blade. The blade portion 13 has a taper that tapers toward the base similarly to a conventional punch.

Reference numeral 14 denotes a truncated cone-shaped tip, and the blade 1
3, the center axis of which is coaxial with the center axis of the punch 11. The tip portion 14 is a portion that is applied to a positioning punch mark that is cast on a workpiece. The upper surface of the blade portion 13 is formed of two inclined planes 15, 15 which are orthogonal to the central axis of the punch 11 and are inclined down toward a straight line L passing through the central axis at an inclined angle α. ing.

Therefore, except for the portion where the straight line L passes, the angle of the blade 16 formed on the outer edge of the inclined plane 15, 15 becomes acute, and the angle of the blade 16 formed on the outer edge of the upper surface 3 of the conventional punch 1 becomes sharp. This punch 11 is extremely sharp as compared with an angle of 90 degrees. In the embodiment, the oblique descent angle α is 6 °,
Depending on the material and size of the punch 11, it can be appropriately selected in the range of 3 to 8 degrees.

Although it is possible to provide three or more inclined planes 15, machining of the inclined plane 15 becomes more difficult, and the strength of the blade 16 is impaired.

Next, the die 21 of the present invention will be described with reference to FIGS. Reference numeral 22 denotes a punch hole. At an upper end of the punch hole 22, a ring-shaped inner slope 23 which is inclined downward at an oblique angle β toward an outer edge of the die 21 is provided. Reference numeral 24 denotes a ring-shaped outer slope, which rises from the outer edge of the inner slope 23 toward the outer edge of the die 21.

Therefore, a sharp edge 25 is provided on the outer side of the upper end of the punch hole 22 from the inner slope 23, and the inner slope 23 and the outer slope 2
4 forms a ring-shaped groove 26 outside the blade 25. The grooves 26 effectively absorb the deformation of the workpiece during drilling.

In the embodiment, the inclination angle β is 3 °, and the inner slope 2
The inner angle γ formed by the outer slope 3 and the outer slope 24 is 120 °, but depending on the material and size of the die 21, the inclination angle β is in the range of 2 ° to 8 °, and the inner angle γ is 90 ° to 120 °. It can be appropriately selected within the range. The depth of the groove 26 is 1.5 mm in the embodiment, but can be appropriately selected in the range of 0.5 mm to 2.5 mm depending on the material and size of the die 21.

[0012]

According to the present invention, the grooves on the upper surface of the die absorb the deformation of the workpiece at the time of drilling, thereby suppressing the deformation after the processing. Especially when used with a punch that has an acute edge formed by two inclined planes on the outer edge of the upper end of the blade, the punch is sharp, so when drilling, the burrs and deformation of the work as in the past Less likely to occur, and low impact noise.

[Brief description of the drawings]

FIG. 1 is a front view of a punch.

FIG. 2 is a plan view of a punch.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged vertical sectional view of a die.

FIG. 5 is a plan view of a die.

FIG. 6 is a front view of a conventional punch.

FIG. 7 is a longitudinal sectional view of a conventional die.

[Explanation of symbols]

 Reference Signs List 11 punch 13 blade part 15 inclined plane 16 blade 21 die 23 inner slope 24 outer slope 25 blade 26 groove

Claims (2)

(57) [Claims] At the upper end of the punch hole (22), there is provided a ring-shaped inner slope (23) which descends toward the outer edge of the die (21), and a ring which rises from the outer edge of the inner slope (23) toward the outer edge of the die (21). Die for drilling provided with an outer slope 24 in the shape of a circle. 2. The inclination angle β of the inner slope 23 is in the range of 2 ° to 8 °, and the inner angle γ formed by the inner slope 23 and the outer slope 24 is in the range of 90 ° to 120 °. The die for drilling according to claim 1.