Tateshi Kishinami

A New Method for Detecting the Contact Point between a Touch Probe and a Surface

Abstract This paper deals with a newly developed touch probe which can directly detect the point between the surface of an object being measured and itself. The proposed method is based on the spherical potentiometer; that is, the probe ball is covered with a thin resistant film and four electrodes are symmetrically allocated on the upper part of the probe ball. By measuring the electric resistance between the four electrodes and the contact point, it is possible to determine where the point of contact is located on the probe ball. This paper describes the computer simulation for designing the probe, the development of the probe based on this principle, the system of measurement using the probe and a coordinate measuring machine, and an evaluation of the developed probe according to the results of experiments.

Development of Numerical Contouring Control Electric Discharge Machining (NCC-EDM)

This paper deals with a newly developed Numerical Contouring Control Electric Discharge Machining(NOC-EDM) system which is based on Profile Electrode, Contouring NC data and Multi-axis NC discharge machine. The proposed NOC-EDN makes it possible to efficiently generate 3-dimensional curved surfaces, configurated by the combination of cross section profiles and its axial motion. In order to generate NC data for the profile electrode and axial motion from given drawings, an Automatic Programming System(APSET-2) has been developed. NCC-EDM system has the following characteristics: 1) As the stock removal is performed as trepanning by using the profile electrode, high speed and low energy machining process is possible. 2) Regarding the machining of 3-dimensional swept surfaces which consist of cross sectional profile and axial motion, the shape of electrode is easily machined by using NC wire discharge machine, and the data of axial motion is also easily produced by the developed Automatic Programming System(APSET-2). 3) The proposed NOC-EDM permits us to produce a complex 3-dimensional mold cavity without any complex female electrode. And a number of such complex 3-dimensional shapes can be made and tried out in a very short time with APSET-2. 4) High accuracy of the electrode shape can be obtained by standardizing of the electrodes. Furthermore, higher machining accuracy and resistance against the electrode wear, can be obtained by using an Automatic Tool Changer(ATC).

Automatic recognition system for relative position of required shape in workpiece space

Abstract This paper deals with an automatic recognition system for determining a relative position of a required shape in the workpiece space such as large castings or forgings. The proposed automatic recognition system consists of a five-direction measuring system for obtaining the entire workpiece shape, an automatic recognition processor for determining the relative position of geometric model in the measured workpiece space, and an automatic marking system which put marks on a workpiece for giving the information of reference planes and points. Satisfactory results have been confirmed by some assessment tests.

The Optimum Sequence of Operations in the Multistage Manufacturing System

In this paper the problem of optimum sequence of operations in the multi-stage manufacturing system (for example, some machining centres or NC machine tools combining some operations) is studied for achieving minimum total cutting cost. In order to determine the optimum sequence of operations in the multi-stage manufacturing system, dynamic programming has been applied to its numerical model, which is obtained by relating the optimum sequence of operations to the optimum job allocation for each operation, and it is pointed out that dynamic programming is a powerful tool for determining the optimum sequence of operations in the multistage manufacturing system.

Distribution of Stress and Strain in Metal Cutting

Stress-strain distributions in the cutting plastic zone are analysed by using the Visioplasticity method with a digital computer.Steady-state flow patterns for these analysis are obtained from the cutting of alpha brass with a 30 deg. rake angle tool, 13.6 mm/sec cutting tool speed and 1.5 mm depth of cut.The plastic behavior in metal cutting is discussed from obtained results.