PROBLEM TO BE SOLVED: To provide recessed part forming method and device capable of forming a recessed part having a highly accurate depth in a short machining time, and a material for forming the recessed part. SOLUTION: In the material to be an object for forming the recessed part, a sheet provided with a first physical characteristic different from a physical characteristic of the material and having the same planar shape as that of the recessed part is incorporated. By using a cutting tool, the material is cut in a depth direction from a first surface of the material. At this time, a physical characteristic of a deepest part of the cutting portion is detected by using a detecting device. When the physical characteristic is equal to the first physical characteristic, cutting in the depth direction is finished. The material is cut in a horizontal direction substantially parallel to the first surface to form a groove. The first surface is divided into a first region having the same shape as the planar shape and a second region to be the other region. Lastly, the material in the first region and between the sheet and the first surface is peeled. COPYRIGHT: (C)2009,JPO&INPIT

Recessed part forming method and device, and material for forming recessed part

PURPOSE:To prevent generation of faulty products by setting the upper limit of torque on the basis of a mean value of cutting torque required for machining an insulation material laeyr and certainly detecting the start of cutting the second conductive material layer requiring larger cutting torque. CONSTITUTION:Such a physical effect is utilized that the cutting resistance of a conductive material layer is larger than that of an insulation material layer. The upper limit of cutting torque is set by a torque detection unit 12 on the basis of an instantaneous cutting torque value of the insulation material layer 6 or a mean value of the cutting torque in a given period of time. When an end will 10 starts a process of cutting the second conductive material layer 7, the torque increases and a spindle feeding motor 8 is stopped in its operation by means of a control unit 11 so that the end mill may retreat. Accordingly, there shall be no chance of th end mill penetrating through the layer 7 to cut out the inner layer marks.

Method of exposing inner later marks of multi-layer lamina haterial

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Method of exposing inner later marks of multi-layer lamina haterial