JPS62120999A - Method of perforating and processing ceramic green sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for punching holes such as through holes in ceramic green sheets.

2. Description of the Related Art Conventionally, the method of bunching holes in ceramic green sheets is as shown in FIG.
A punch stand 2 is provided on one side of the ceramic green sheet 1, and a presser foot 3 is lowered from the opposite side to hold the ceramic green sheet 1. Thereafter, the punch 4 is lowered to punch out the hole 5, and then the presser foot 3 and the punch 4 are returned to complete the drilling process.

Problems to be Solved by the Invention However, in such a method, when the ceramic green sheet 1 is inspected after processing, punching holes 6 occur at a height h of about 5 to 151 tm, as shown in FIG. However, when through-holes are formed by conductor printing in a post-process, problems such as poor conductivity and withstand voltage due to Paris etc. occur, resulting in poor product yields.

Means for Solving the Problems Therefore, the present invention focuses on the fact that when a hole is punched out in a ceramic green sheet, the ceramic green sheet contracts in the direction of reducing the diameter of the hole in the periphery of the hole. When the punch with the double-sided tower processing blade on the return side moves forward, the processing blade on the punching side punches and forms the ceramic green sheet, and when the punch returns, the processing blade on the return side punches and forms the hole in the ceramic green sheet. The punched edges have been removed.

In other words, immediately after punching holes in the ceramic green sheet with the punching side machining blade, the punching hole shrinks to a diameter of 10 to 20 pm smaller than the diameter of the punch. When returning, the punching edges can be removed with the return side machining blade of the punch, making it possible to punch holes in the ceramic green sheet without any edges.

Example An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 7 is a ceramic green sheet, 8 is a punch stand, 9 is a guide stand, 10 is a punch, and the ceramic green sheet 7 is positioned on the punch stand 8, and the punch 1
o is provided with a punching side processing blade 11 and a return side processing blade 12,
The diameter d1 of the shaft portion of the punch 1o is made slightly smaller than the diameter d of the cutting edge portion 13. With the above configuration, Figures 2, 3, 4,
To explain the operation with reference to Fig. 5, Fig. 2 shows the ceramic green sheet 7 after punching holes. Fix the green sheet 7 so that it does not shift, and punch the punch 1.
0 is lowered (forward movement), and the punching hole D1 is machined with the punching side machining blade 11. At this time, punch stand 8 and punch 1o
There is a clearance between the ceramic green sheet 7 and the cutting edge 13, and punching holes 14 occur in the ceramic green sheet 7. The machining of the punched hole is completed in the above manner, but as shown in FIG. 3, after the punching process, the punched hole D1 contracts and shrinks to the size of the punched hole. In this state, when moving to the return process shown in Figure 4,
The punch 10 moves upwards (backwards), and the guide table 9 and the return side machining blade 12 process the ceramic green sheet 7 from the opposite side to that used during punching.The ceramic green sheet 7 is machined with rounded surfaces 16 on both end faces. At the same time, holes can be punched without punching holes.

Effects of the Invention As described above, according to the present invention, a ceramic green sheet can be processed from both the front and back sides in one punching operation cycle, and punching edges can be removed.
It is possible to provide a processing method for forming holes in ceramic green sheets that can improve continuity reliability by forming through-holes through conductor printing, which is a post-process.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a method for processing a ceramic green sheet in an embodiment of the present invention, Fig. 2 is an operation diagram showing the process of punching a ceramic green sheet, Fig. 3 is an operation diagram showing shrinkage of punched holes, and Fig. 4 is an operation diagram showing the shrinkage of the punched hole. The figure is an operation diagram showing the return process of punching out the ceramic green sheet from the back side and removing the cracks.
Fig. 5 is a cross-sectional view showing a completed hole machined using the ceramic green sheet processing method of the present invention, Fig. 6 is a block diagram of the processing method according to the conventional method, and Fig. 7 is a completed punched hole machined using the conventional method. FIG. 3 is a sectional view showing a machined hole. 10... Punch, 11... Punching side processing blade, 12... Return side processing blade, 14...
・Punching Paris. Name of agent: Patent attorney Toshi Nakao, male and 1 other person
Figure 12--Primary 1-fired sword (4-Ichiko twins) ζwa Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] In the method of punching holes such as through holes in ceramic green sheets, when a punch with processing blades on both the punching side and return side moves forward, the holes are punched in the ceramic green sheet with the processing blades on the punching side. A method for drilling holes in a ceramic green sheet, characterized in that, when the punch moves backward, the punching edge produced in the hole during punching is removed by the return side processing blade.