JPS607857Y2 - punch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the improvement of punches and contributes to the prompt detection of accidents such as cracks and breakage that occur due to use over time.

For example, punches used for coining, punching, etc. installed on a press processing line often crack or break due to continuous use over time.

In such a case, it is necessary to immediately stop the work and replace the punch with a new one, but in reality, it is necessary to check whether the punch has cracked or not, or whether the tip is broken or not, and the center of the punch holder such as the brim is damaged. If it is broken, it will almost never fall, so it is extremely difficult to detect whether or not it is broken during continuous work.

Therefore, by the time these accidents are noticed, a large number of defective products have already been produced, which is extremely inconvenient.

Therefore, in the past, in order to detect this problem early, for example, workers paid attention to changes in work vibrations, or testing methods such as X-ray transmission were tried, but the former required considerable skill on the part of the workers. Not only is this not common, but even the latter method is impractical because it requires the installation of large-scale equipment.

In view of this situation, the present invention has made it possible to immediately detect breakage of a punch in a simple and most reliable way. , which is characterized in that a coloring liquid is sealed in the hollow hole.

The specific content of the present invention will be explained below based on an illustrated embodiment. Reference numeral 1 indicates a punch attached to a ram 6, in which a punch is provided along the longitudinal direction from the base 1a to the tip 1b. It has a hollow hole 2.

The hollow hole 2 is filled with red ink 3 to the extent that a slight gap 4 is left between the hollow hole 2 and the opening, and a rubber stopper 5 is pushed into the opening to seal it.

In this case, the gap 4 is made large enough to be slightly redundant, and when the rubber stopper 5 is pushed as deep as possible into the gap 4, the gap 4 is compressed and the red ink 3 is further prevented from popping out in the event that the punch 1 breaks. It can be made good.

However, when forming a nut seat on the workpiece 8 placed on the jig 7, the work is carried out by lowering the press ram 6, but during the continuous operation due to repeated operations, the punch 1 If a crack occurs or breaks at any point, the red ink 3 inside the hollow hole 2 leaks out almost simultaneously, notifying the operator.

The coloring liquid to be filled into the hollow hole 2 is not necessarily limited to the red ink shown in the above embodiment; for example, in addition to black, yellow, and blue inks, fluorescent coloring agents may also be used. Various methods that appeal to the operator's eyes are applied.

As is clear from the above, in the present invention, if any part of the punch cracks or breaks during operation, the coloring liquid filled in the hollow hole leaks out and the worker is injured. As a result, the work can be interrupted immediately, and as a result, it is possible to prevent the production of a large number of defective workpieces.

[Brief explanation of the drawing]

The figure is a sectional view of a main part of a state in which a nut seat is formed on a workpiece using a punch according to an embodiment of the present invention. 1... Punch, 2... Hollow hole, 3...
...Red ink, 4...Gap, 5...
·Rubber stopper.

Claims (1)

[Scope of utility model registration request] A punch characterized in that a hollow hole is provided in the shaft along the longitudinal direction, and a coloring liquid is sealed in the hollow hole.