JPH0677923U - Cutting punch blades and punch dies - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a blade having a punching force less than that of a conventional blade having the same diameter by adjusting the conditions for punching an iron plate. [Structure] The blade angle (2) of the blade (1) is set to be smaller than 128 degrees, and at the same time, the clearance angle (3) is set to be larger than 15 degrees so that it can escape from any position of the blade tip (4) to the blade bottom (5). Make sure there are corners, and for the punch die,
The inner diameter of the punch die (6) is larger than that of the blade (1) by 0.5 mm to 0.7 mm.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a punching punch blade and a punch die.

[0002]

[Prior art]

 Conventionally, the cutting edge angle of a cutting tool is 140 degrees or more, the clearance angle of the cutting edge is 5 degrees, and the clearance angle of the blade bottom is almost 0 degree. The diameter of the punch die and the cutting tool was about 0.2 mm to 0.3 mm in diameter.

[0003]

[Problems to be solved by the device]

With the conventional blade, the punching force was 2700 kg / mm ² when a blade having a diameter of 30 was used. A larger punching force is required than when the diameter is increased. Moreover, if the gap between the inner diameter of the punch die and the outer diameter of the blade is large, a larger force is required, and if the gap is too small, the blade cannot be inserted into the punch die when the axis (7) of the punch die and the blade are deviated. If the gap is too large, burr (a bulge that occurs around the hole during punching) will appear on the iron plate with the hole. The present invention was devised so that the punching force would be smaller than that of the conventional product by the blade and the mechanical error could be absorbed by the blade, and when the hole was punched, the burr (bulge around the hole when punching) It was devised so that it would not occur.

[0004]

[Means for Solving the Problems]

 The blade angle (2) of the cutting tool (1) is set to be smaller than 128 degrees, and at the same time, the clearance angle (3) is set to be larger than 15 degrees. Then, the clearance angle is set at any position from the blade edge (4) to the blade bottom (5). As for the punch die (6), the inner diameter of the punch die (6) is made larger than the outer diameter of the blade (1) by 0.5 mm to 0.7 mm. The present invention is a blade having the above configuration.

[0005]

[Action]

 The iron plate (10) can be punched by placing the iron plate (10) between the blade (1) and the punch die (6) and pressing the blade in the direction of the punch die (6). Also, by changing the angle, it became possible to punch the iron plate (10) with a small pressing force.

[0006]

【Example】

 Hereinafter, the present embodiment will be described with reference to the drawings. The punching force measurement experiment of the blade and punch die reduces the punching force, improves the wear resistance of the blade and punch die, and reduces the stroke of the blade (distance from the biting start of the iron plate to the exit) as much as possible, and the punched hole In order to eliminate burrs (bulges that occur around the hole after punching) (a) As shown in Fig. 1, the cutting edge angle (2) of the cutting tool (1) is set between 125 degrees and 123 degrees. . (B) As shown in FIG. 1, the relief angle (3) of the blade (1) is provided so as to be between 15 degrees and 20 degrees. (C) FIG. 2A shows the cross-sectional position and the perspective direction at the blade bottom (4), the cross-sectional view at that time is shown in FIG. 2B, and FIG. 2C shows the cross-sectional position and the perspective direction of the cutting edge (5). A sectional view at that time is shown in FIG. 2D. 2E shows a cross-sectional position and a perspective direction in the middle of the blade edge (5) and the blade bottom (4), and FIG. 2F shows a sectional view at that time. As described above, as shown in FIGS. 2B, 2D, and 2F, the cutting blade (11) is provided with the same clearance angle (3) at any position. (E) As shown in FIG. 3, the inner diameter (9) of the punch die (6) is larger than the outer diameter (8) of the blade (1) by 0.5 mm to 0.7 mm. The present invention is configured as described above, and when using this, as shown in FIG. 4, an iron plate (7) is placed between the blade (1) and the punch die (6) to pressurize the blade (1). Then, the blade (1) is pressed into the punch die (6) to punch out the iron plate (10). Also, by changing the angle of the blade (1), it becomes easier to bite into the iron plate (10), and punching is possible with less pressing force than conventional products.

[0007]

[Effect of device]

 By changing the cutting edge angle (2) and the clearance angle (3) of the blade (1), the force required to bite into the iron plate (10) has been reduced, and by providing the cutting blade (11) with the clearance angle of the same angle, It became possible to punch the iron plate (10) with a constant force from the bite into the iron plate (10) until the iron plate (10) was broken. As a result of comprehensively examining from the two effects, a pressing force of a blade having the same diameter was reduced by about 1/3 as compared with the conventional type.

[Brief description of drawings]

1A and 1B are perspective views of a blade of the present invention.

FIG. 2A is a perspective view showing a cross-sectional position and a perspective direction of a blade bottom of the present invention. 3B is a sectional view taken along the line AA 'of the present invention. C is a perspective view showing a position of a cross section and a perspective direction of a cutting edge of the present invention. D is B of the present invention
It is sectional drawing in a -B 'cross section. E is the cutting edge of the present invention,
It is the perspective view which showed the position of the cross section of the middle of a blade bottom, and the perspective direction. F is a sectional view taken along the line CC 'of the present invention.

FIG. 3 is a perspective view showing the relationship between the blade and the punch die of the present invention.

FIG. 4A is a perspective view showing a state before punching according to an embodiment of the present invention. FIG. 3B is a perspective view showing a state after punching according to the embodiment of the present invention.

[Explanation of symbols]

 1 Cutting Tool 2 Cutting Edge Angle 3 Clearance Angle 4 Cutting Edge 5 Cutting Edge 6 Punch Die 7 Axis 8 Outer Diameter 9 Inner Diameter 10 Iron Plate 11 Cutting Blade

Claims (2)

[Scope of utility model registration request] 1. A blade for a punching punch, wherein a blade angle (2) provided on the blade (1) is smaller than 128 degrees,
A tool having a clearance angle (3) greater than 15 degrees and a cutting blade (11) having a clearance angle (3) evenly at any position from the blade tip (4) to the blade bottom (5). 2. A punch die in which the inner diameter (9) of the punch die (6) is larger than 0.5 mm to 0.7 mm with respect to the outer diameter (8) of the blade (1).