JPH0317574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a groove forming press type device used for forming grooves on a grooved brake disk or the like.

Conventionally, this kind of apparatus is equipped with a blank holder a and a groove-forming punch b that can freely come out and go in front of the blank holder a, as shown in FIG.
When the punch b comes into contact with the
There are known products in which the groove Wa is carved, but in this case, sag occurs in the shoulder part of the groove Wa due to the press-fitting of the punch b, and it is necessary to remove the edge of the shoulder part of the groove Wa, such as in brake discs. In this case, it is necessary to cut the workpiece W to the position shown by the dotted line in FIG. 1 after grooving, and in the conventional method, the cutting allowance becomes large, which causes the inconvenience that machining is time-consuming and the material yield is poor.

SUMMARY OF THE INVENTION In order to eliminate such inconveniences, an object of the present invention is to provide a device capable of suppressing the occurrence of sagging at the groove shoulder as much as possible. A groove carving punch which is provided with a groove carving punch that can freely come out and retract from the outer surface of the formed guide hole, and when the holder comes into contact with the work, the punch protrudes and carves a groove in the work. In a press type device, protrusions having a V-shaped cross section that are located on both sides of the guide hole and bite into the workpiece are provided on the outer surface of the holder, and the edge of the guide hole on the inside of the protrusion is connected to the holder on the outside. It is recessed from the outside surface.

Next, the present invention will be explained with reference to the illustrated embodiments.

Referring to FIG. 2, reference numeral 1 indicates a blank holder, and reference numeral 2 indicates a groove-forming punch.The holder 1 is supported by an elastic member, for example, on an upper die (not shown) that can be raised and lowered, and the punch 2 is attached to the holder 1. A protrusion having a V-shaped cross section is disposed on the lower surface of the holder 1 so as to be freely protrusive and retractable through the guide hole 3 formed in the guide hole 3, and is located on both sides of the protrusion of the punch 2, that is, on both sides of the guide hole 3. 4,4 was established. Note that the hole edge 3a of the guide hole 3 inside the projection 4 is slightly offset above the holder surface outside the projection 4.

The tip surface of the punch 2 is formed into a flat surface or a chevron-shaped surface.

Next, to explain the operation, when the upper mold is lowered from the state shown in the second figure, first, the blank holder 1
The protrusions 4, 4 on the lower surface come into contact with the workpiece W such as a brake disk, push the meat of the workpiece W apart and bite into it, and the meat gathers inside each of the protrusions 4, causing the meat to swell up as shown in Figure 3. The state will be as follows. When the upper die is further lowered, the punch 2 protrudes from the lower surface of the holder 1 through the guide hole 3, and a groove Wa is carved in the workpiece W as shown in FIG. The meat is prevented from being pulled toward the punch 2 side by the projections 4, and only the meat inside the projections 4 is pulled in.

Here, as described above, on the inside of each protrusion 4, extra thickness is formed by the meat rising higher than the surface of the workpiece W due to the biting of each protrusion 4 into the workpiece W. The meat is drawn in, and grooves can be carved without applying excessive force to the meat inside each of the protrusions 4.

In this case, even if sagging occurs due to the drawing of this excess thickness, the depth of the sag relative to the surface of the workpiece W can be suppressed to be shallow because the excess thickness is raised higher than the surface of the workpiece W.

Then, the workpiece W is
The product is obtained by grinding, but the amount of penetration can be set to less than half of the amount of sag in the shoulder that occurs when grooving is performed using conventional equipment, and the cutting allowance is also reduced accordingly. .

As described above, according to the present invention, V-shaped protrusions are provided on the outer surface of the blank holder located on both sides of the guide hole, and the protrusions are made to bite into the workpiece prior to pushing in the punch. The protrusion prevents the meat from being drawn toward the punch when the punch is pressed in, thereby suppressing the sagging of the shoulder of the groove, and since the edge of the guide hole inside the protrusion is recessed, this By raising the meat higher than the surface of the workpiece before pushing the punch into the part, it is now possible to carve grooves with less sag without applying excessive force to the meat inside the protrusion, making it possible to carve grooves. The subsequent grinding process becomes easier and the material yield is also improved, which has the effect of improving productivity and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a cut-away side view of a conventional device, FIG. 2 is a cut-away side view of an example of the device of the present invention, and FIGS. 3 and 4 are cut-away side views illustrating its operation. 1... Blank holder, 2... Punch, 3...
Guide hole, 3a... edge, 4... protrusion, W...
Work, Wa...groove.

Claims (1)

[Claims] 1. A blank holder, and a groove-carving punch that can freely appear and retract from the outer surface of the blank holder through a guide hole formed in the blank holder, and when the holder comes into contact with the workpiece, the punch protrudes to carve a groove in the workpiece. In the grooving press-type device as described above, protrusions having a V-shaped cross section that are located on both sides of the guide hole and bite into the workpiece are provided on the outer surface of the holder, and an edge of the guide hole inside the protrusion is provided. 1. A press-type device for groove engraving, characterized in that a portion of the holder is recessed from an outer surface of the holder.