JP2001129794A - Punching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punching device minimizing the number of defective products in punching of a ceramic green sheet by immediately deciding a punching defect and raising an alarm. SOLUTION: This punching device has a sensor detecting reflected light below a punching die and a mechanism deciding simultaneously with the punching from reflected light intensity whether normal punching is executed or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for punching a sheet-like substrate, and more particularly to an apparatus for punching a ceramic green sheet for forming a ceramic multilayer substrate.

[0002]

2. Description of the Related Art As a device for making a hole in a sheet-like substrate, there is, for example, a hole making device as disclosed in Japanese Patent Application Laid-Open No. 2-84304. The punch pin was lowered by the driving force of the coil or the like to make a hole in the green sheet. Usually, in order to make a plurality of holes in a green sheet, a punch pin is lowered to make a hole, then the punch pin is raised, and the green sheet is fed at a pitch to perform a plurality of through-holes. At this time, due to the wear of the punch pin, etc., it is difficult for the scrap left at the tip of the pin to come off the tip of the pin, and the hole in the green sheet is clogged when the punch pin rises, or the hole is not clear due to the breakage of the punch pin. May occur. For this reason, after drilling, it was necessary to check the sheet for proper drilling by visual inspection or the like.

[0003]

However, in the method of visually confirming after drilling, if a large number of holes, for example, tens of thousands, are formed in one sheet, all holes are normally formed. It takes a long time to confirm that there is a problem that all the sheets punched during the confirmation are defective.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problem, the present invention irradiates light to the perforated portion from below the sheet when the punch pin of the perforating machine is raised, and detects the reflected light. Then, by providing means for determining whether or not the hole is normally drilled based on the intensity of the reflected light, it is possible to confirm that the hole is drilled normally simultaneously with the drilling process.

[0005]

FIG. 1 shows an embodiment of the present invention. The actuator 1 drives the punch pin 2 up and down. The punch pin 2 is guided by a punch pin guide 3 supported by an upper die 4. The actuator 1 is driven by a driver 10 under a command from a controller 11. The lower die 6 supports a die 7 for boring. The hole diameter of the die 7 is larger than the outer diameter of the punch pin 2, and when the punch pin 2 descends, the tip of the punch pin 2 is inserted into the hole of the die 7, and at this time, the green sheet 5 is sheared. A light source 8 and a sensor 9 for capturing reflected light are provided below the die 7. The light source irradiates the green sheet 5 through the hole of the die 7. The sensor 9 captures the reflected light from the green sheet 5.

In the above configuration, the controller 11 first issues a command to lower the punch pins 2 in order to drill the green sheet 5. Next, a command to raise the punch pin 2 is issued, and the output of the sensor 9 is checked at the timing when the punch pin 2 rises. When the hole normally penetrates as shown in FIG. 2, the light of the light source 8 passes through the through hole of the green sheet 5, and the reflected light from this portion hardly returns. Therefore, the output value of the reflected light intensity of the reflected light captured by the sensor 9 decreases. On the other hand, when the hole does not penetrate normally, the output value of the reflected light intensity becomes larger than that in the normal state.

The controller 11 checks the intensity of the reflected light using an appropriate threshold value to determine whether or not a hole is normally formed.

[0008]

According to the present invention, it is possible to judge whether or not the drilling has been performed normally at the same time as the drilling. Therefore, when a defect occurs, an alarm can be immediately issued, and the number of defective products can be minimized. It can be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a punched portion to which the present invention is applied.

FIG. 2 is an explanatory diagram at the time of normal drilling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Actuator 2 ... Punch pin 3 ... Punch pin guide 4 ... Upper die 5 ... Ceramic green sheet 6 ... Lower die 7 ... Die 8 ... Light source 9 ... Sensor 10 Driver 11 Controller

Claims (1)

[Claims] 1. A device for punching a hole by lowering and raising a punch pin guided by a punch pin guide hole with respect to a sheet-like substrate. A drilling device, wherein light is detected and whether or not a hole is normally formed is determined based on the intensity of the reflected light.