JPS5836414Y2 - Punch punch with anti-galling mechanism - Google Patents

Description

[Detailed description of the invention] This invention relates to a punching punch with a galling prevention mechanism used when drilling holes in a workpiece. It exhibits galling prevention effect regardless of thickness.

When drilling holes in long materials such as aluminum sash frames, conventionally the die was placed on the back side of the material so that the center of the hole to be drilled coincided with the center of the die hole. After positioning the hole, the center of the punch is aligned from above with the center of the hole to be punched, and a press machine or the like is used to apply pressure, thereby punching the hole.

However, such a die generally has to be accurately positioned at a predetermined position on the back side of the workpiece, but if the workpiece is a hollow member, the die is made slightly smaller than the hollow part of the workpiece, so it is necessary to place the die in a hollow workpiece. There were many cases where there was some lateral deviation within the hollow part of the.

If the die shifts laterally in this way, the die hole drilled in the die will also shift laterally, so if the punch is pressurized in that state, the cutting edge of the punch will come off the die hole. The peripheral edge of the die hole was damaged, causing a so-called galling phenomenon.

Furthermore, when the distance from the end face of the workpiece to the center of the hole to be drilled is long, the die hole tends to shift in the longitudinal direction, resulting in the same problem as the above-mentioned force strain phenomenon.

In order to eliminate such drawbacks, Japanese Patent Application Laid-Open No. 53-13159
In No. 3, an auxiliary cutting edge for punching guide is formed protruding in the center area of the front surface of the main shearing blade of the punch, and has an outer edge-to-edge dimension that is shorter than the outer edge-to-edge dimension of the main shearing blade by twice the thickness of the workpiece. First, the punch is automatically centered on the die hole of the die by pushing and bending the workpiece downward with the auxiliary cutting edge for punching guide, and when the center of the punch and the center of the die hole of the die are aligned, the punch is further removed. A press punching tool for punching a desired hole by applying pressure has also been proposed.

However, this punching tool for presses can only automatically center the punch in the die hole of the die by pushing and bending the workpiece downward with the auxiliary cutting edge for punching guide, only when working with workpieces of a constant thickness. If the material to be worked changes and the difference between the outer edge dimension of the main shearing blade of the punch and the outer edge dimension of the auxiliary cutting edge for punching guide becomes longer than twice the thickness of the material to be worked, the punching guide Even if the workpiece is pushed downward with the auxiliary cutting edge of the tool, the outer edge of the pressed and bent workpiece will not come into contact with the die hole of the die.
The center of the punch did not match the center of the die hole of the die, and it was not possible to prevent the punch from snapping into the die.

This invention eliminates these drawbacks and is revolutionary in that the punch is always accurately and automatically centered on the die hole of the die, regardless of the thickness of the workpiece, and as a result, the punch is prevented from galling into the die. To provide a punch with a galling prevention mechanism having a galling prevention mechanism having a structure.

More specifically, the present invention includes a tip punch portion that punches a pilot hole in the machined surface of the workpiece according to the position of the die hole of a die applied to the back side of the machined surface, and a hole that is continuous from the tip punch portion. A press-and-spread portion is formed and is formed continuously at the rear of the press-spread portion, which presses down the peripheral edge of the prepared hole on the machined surface to create a tapered shape for centering the die hole of the die. A hole is formed on the outer periphery of the rear punch base at a predetermined angle with respect to the axial direction, and a hole having the same cross-sectional shape as the rear punch base is bored in the machined surface of the workpiece. The present invention provides a punching punch with a galling prevention mechanism, which is characterized by a sharper blade part.

Hereinafter, one embodiment of a punching punch with a galling prevention mechanism according to the present invention will be described in detail with reference to the drawings.

Figure 1 shows one of the punching punches with a galling prevention mechanism according to the present invention.
2 is a left side view of the same; FIG. 3 is a front view of a state in which a punch with a galling prevention mechanism according to the present invention is used to punch a hole in an aluminum sash frame material; FIG. 4 is a front view of the embodiment; 7 to 7 are longitudinal cross-sectional views showing a state in which a punch is being punched with a galling prevention mechanism according to the present invention.

In the drawings, reference numeral 1 indicates a processed material, and the illustrated embodiment is a hollow member having a hollow portion inside.

The punch 3 with a galling prevention mechanism according to the present invention is used for punching a desired hole in the work surface 1a of the workpiece 1 to be bent.

A die 2 is inserted into a hollow portion of the workpiece 1 when a desired hole is bored in the workpiece surface 1a of the workpiece 1, and the die hole 2a is formed at a predetermined position.

The die hole 2a of this die 2 and the punch make the workpiece 1
A desired hole is punched by applying a shearing force to the machined surface 1a.

3 is a punching punch with a casino prevention mechanism according to the present invention,
The tip punch part 3a punches a pilot hole 1b in the workpiece surface 1a of the workpiece 1, and the die hole 2a of the die 2 and the hole to be punched by pushing and expanding the periphery of the pilot hole 1b of the workpiece surface 1a downward. , a rear punch base 3C formed continuously at the rear of the pressed and expanded portion 3b, and the machined surface 1.
A cutting edge portion 3d is used to punch a desired hole, that is, a hole having the same cross-sectional shape as the rear punch base 3C, with the lower part 1b of the hole approximately at the offshore center.

The cutting edge 3d is formed at a position adjacent to the expanded portion 3b on the outer periphery of the rear punch base 3C, and forms a predetermined angle with respect to the axial direction of the rear punch base 3C.

It goes without saying that in the sagging structure, the cross-sectional shapes of the tip punch portion 3a and the rear punch base may have various shapes other than the circular shape shown in the drawings.

The punching punch with a galling prevention mechanism according to the present invention has the above-mentioned configuration, and its usage will be explained below.

First, the punching punch 3 with a galling prevention mechanism according to the present invention having a rear punch base 3C having the same shape as the shape of the hole to be drilled is attached to a press machine, etc., and the rear part of the punching punch 3 with a galling prevention mechanism is attached. A die 2 having a die hole 2a having a shape corresponding to the cross-sectional shape of the punch base 3C is installed at a predetermined position on the back surface of the workpiece 1 (the state shown in FIG. 3).

Next, a press machine or the like is operated to lower the punch 3 with a galling prevention mechanism according to the present invention, and the tip punch portion 3 is lowered.
A pilot hole 1b is bored at a predetermined position on the processing surface 1a of the workpiece 1 by means of the step (a) (state shown in FIG. 4).

Furthermore, when the punch 3 with a galling prevention mechanism according to the present invention is lowered, a widened portion 3b that is continuously formed from the tip punch portion 3a and which enhances the tapered shape is punched in the processed surface 1a of the workpiece 1. Since the periphery of the pilot hole 1b that has been pierced is pushed downward and expanded, even if the die hole 2a of the die 2 is misaligned with the center of the punch 3 with a galling prevention mechanism according to the present invention, the die 2 is automatically moved to match the center of the punching punch 3 with a galling prevention mechanism by the portion pushed up by the expanding portion 3b of the punching punch 3 with a galling prevention mechanism, so that the centers of the two are completely aligned (
(Situation shown in Figure 5).

The reason why the position of the die 2 relative to the punch 3 with a galling prevention mechanism is automatically and smoothly adjusted is that the tapered surface of the expanded portion 3b of the punch 3 with a galling prevention mechanism remains unchanged at the rear punch base 3C. Furthermore, since the cutting edge 3d is formed on the surface of the rear punch base 3C adjacent to the pushing and expanding portion 3b, when the punch 3 with a galling prevention mechanism is lowered, the workpiece is This is because the outer edge of the downwardly expanded portion of the workpiece comes into contact with the die hole 2a of the die 2, regardless of the thickness.

When the center of the die hole 2a of the die 2 and the center of the punching punch 3 with a galling prevention mechanism according to the present invention coincide with each other, the punching punch 3 with a galling prevention mechanism according to the present invention is further lowered, and the cutting edge 3d is removed. The expanded portion 3 of the processed surface 1a of the processed material 1
The part that has been pushed downward in step b is cut (the state shown in FIG. 6), and is caused to fall downward as small chips (the state shown in FIG. 7).

Thereafter, the punch with anti-galling mechanism according to the present invention is pulled out to complete the drilling process.

In addition, when punching a hole in the workpiece 1 using the punch 3 with a galling prevention mechanism according to the present invention, if the workpiece is a hollow member as in the illustrated embodiment, the workpiece 1
If you install the die holder 4 at the bottom of the hole and perform the drilling process,
This is preferable because the work can be performed more reliably.

Furthermore, when the workpiece 1 is a hollow member in the above-mentioned drilling process, the punching punch 3 with a galling prevention mechanism according to the present invention is further lowered before being pulled out, and the part below the workpiece surface 1a of the workpiece 1 is cut into the tip. It is also possible to perform the punching operation all at once using the punch portion 3a.

As described in detail above, the punching punch 3 with a galling prevention mechanism according to the present invention allows the die hole 2a drilled in the die 2 located on the back side of the punching position of the workpiece 1 to be positioned more precisely. The die hole 2a is automatically opened by the pushing and expanding portion 3b of the punch 3 with anti-galling mechanism without any restriction.
The position of the hole can be corrected, and this correction can always be made accurately regardless of the thickness of the workpiece, so it can be used as is for workpieces of various thicknesses, greatly increasing the drilling ability. The punching process also reduces the size of chips, making post-processing easy.

Furthermore, the punching punch 3 with a galling prevention mechanism according to the present invention has the advantage of having a simple structure and being manufactured at low cost, and anyone can easily use the punching punch 3 with a galling prevention mechanism according to the present invention. It also has the advantage that the workpiece 1 can be reliably drilled, and its practical value is very great.

[Brief explanation of drawings]

Figure 1 shows one of the punching punches with a galling prevention mechanism according to the present invention.
2 is a left side view of the embodiment; FIG. 3 is a front view of a state in which a punch with a galling prevention mechanism according to the present invention is used to punch a hole in a frame material for an aluminum sash; FIG. 4 is a front view of the embodiment; 7 to 7 are longitudinal cross-sectional views showing a state in which a hole is being punched using a punching punch with a galling prevention mechanism according to the present invention. 1... Processed material, 1a... Processed surface, 1b
...... Pilot hole, 2... Die, 2a...
...Die hole, 3...Punching punch with galling prevention mechanism according to the present invention, 3a...Tip punch part,
3b...Press expansion part, 3C...Rear punch base, 3d...Cutting blade part, 4...Dice receiver.

Claims (1)

[Scope of utility model registration request] A prepared hole 1b is formed on the processed surface 1a of the workpiece 1 in accordance with the position of the die hole 2a of the die 2 applied to the back surface of the processed surface 1a.
A tip punch portion 3a for drilling a hole 1b formed continuously from the tip punch 3a and a prepared hole 1b in the processing surface 1a.
a pushing-spreading part 3b which forces the peripheral edge of the die 2 downward to create a tapered shape for centering the die hole 2a of the die 2; and a rear punch base 3C formed continuously at the rear of the pushing-spreading part 3b. A cutting edge portion 3d is formed on the outer periphery of the workpiece at a predetermined angle with respect to the axial direction, and punches a hole having the same cross-sectional shape as the rear punch base portion 3C in the workpiece surface 1a of the workpiece 1. A punching punch with a galling prevention mechanism.