An ELID centerless grinding apparatus comprising: a blade 2 for horizontally supporting a rotator workpiece 1 and and a regulating wheel 10 driven to rotate around a horizontal shaft center. An outer surface of the workpiece is subjected to ELID grinding by using a conductive grinding wheel 4 . An outer peripheral portion of the wheel 10 includes a conductive elastic member 11 and abrasion resisting particles 12 . An electrolytic electrode 14 is provided in close vicinity to an outer peripheral surface of the wheel 10 . An electrolytic power supply 16 applies an electrolytic voltage between the electrolytic electrode and the wheel. A conductive electrolytic fluid is flow between the electrode and the wheel and the member 11 is removed by the electrolytic dressing to cause the abrasion resisting particles 12 to project, while the particles 12 are brought into contact with the outer peripheral surface of the workpiece 1 to rotate around its shaft center. Consequently, the coefficient of friction of the outer peripheral surface shape of the regulating wheel 3 with respect to the workpiece can be maintained more or less constant during the grinding process of the workpiece.

Elid centerless grinding apparatus

In the ultrasonic inspection method and equipment, a high-resolution and high-S/N-ratio inspection image can be speedily acquired with ease-of-operability. Inspection of the inside of the inspection target is performed by changing incident angle of the ultrasonic wave oscillated from the array-probe ultrasonic sensor. Then, while performing the inspection, the array-probe ultrasonic sensor is sequentially displaced from the position to the position via the position by using the displacement member. This displacement allows acquisition of inspection images on each position basis. Finally, the inspection images thus acquired are visualized as a processed image by adding or averaging the inspection images by shifting the images by displacement quantity of the array-probe ultrasonic sensor.

Ultrasonic inspection method and ultrasonic inspection equipment

A damage evaluation method and apparatus of a metal material which is capable of determining whether a flaw in the metal sample is originated by the creep damage or in the manufacturing process, and also capable of estimating a remaining life of the metal component The damage evaluation method of a metal material by the present invention is a method for evaluating a flaw in the metal sample comprising the steps of mounting onto a metal surface including an internal flaw and on both sides of the flaw a transmitting probe for transmitting an ultrasonic waves and a receiving probe for receiving the ultrasonic waves, transmitting the ultrasonic waves towards the internal flaw and receiving the diffracted wave from the flaw for determining whether or not a flaw is present in the metal, based on the analysis of the distribution of the diffracted waves and an analysis of the sample as to whether voids (creep voids) are present and, if present, the distribution of the voids

Method and apparatus for evaluating damage of metal material

An ultrasonic probe issues an ultrasonic wave to an object, receives a reflected wave from an object, and is provided with multiple piezoelectric elements. A three-dimensional display section displays three-dimensional flaw detection data superimposed on three-dimensional shape data of an object. The computer acquires a reflected ultrasonic wave signal from a reference object (reference). Based on the acquired signal, the computer corrects a reflected ultrasonic wave signal acquired from another object having the same material and shape as the reference. The computer allows the three-dimensional display section to display three-dimensional flaw detection data generated from a reflected ultrasonic wave signal resulting from a difference between a reference and an object.

Ultrasonic flaw detector and ultrasonic flaw detection method

An apparatus having a sample sectioning device including a cutting mechanism that is operable to cut sections from a sample and a sample holder that is operable to hold the sample. The apparatus further includes a drive system coupled with the sample holder to drive movement of the sample holder and a reciprocating member coupled to the drive system to drive vertical movement of the drive system. The reciprocating member to move in a reciprocating manner within an angle of rotation of less than 180 degrees. A surface orientation sensor may further be provided that is operable to sense an orientation of a surface of the sample held by the sample holder.

Reciprocating microtome drive system

PROBLEM TO BE SOLVED: To provide a centerless grinding technique with high producing efficiency allowing the grinding of a rod work at its end axial portion having an extremely small diameter while maintaining high coaxiality and a cylindricity. SOLUTION: After the work W is supported at its base axial portion Wa pushed against a regulating wheel 2 by a pressure roller 4 and the work W is fed to the axial direction by a push rod 5 while being forcibly rotated, the end axial portion Wb of the work W is ground by the grinding wheel 1. In the case of the end axial portion Wb of the work W has an extremely small diameter, the longitudinal direction of the work W to be ground can be accurately controlled and the end axial portion Wb of the work W can be ground with reference to the outer diameter of the base axial portion Wa. As a result, grinding work is applied to the stepped work W with less runout of the axial center in a short time while maintaining high coaxiality and cylindricity.

Centerless grinding method and centerless grinding device for rod work

PROBLEM TO BE SOLVED: To make a defect existing in the vicinity of a surface of a specimen detected. SOLUTION: A waveform data of a reflected echo provided by a probe 10 in each flaw detection position is stored in a waveform memory 40. A difference computing means 31 conducts difference computation between the waveform data obtained by flaw detection in the each flaw detection point and the waveform data obtained by the last flaw detection in the flaw detection point adjacent to the flaw detection position to find a difference waveform data. A surface echo reflected on the specimen 2 to be returned is removed thereby, and only a defect echo reflected by the defect to be returned is contained in the difference waveform data, when the defect exists in the vicinity of the surface of the specimen 2. The defect existing in the vicinity of the surface of the specimen 2 is detected thereby based on the difference wave form data.

Ultrasonic flaw detector

PROBLEM TO BE SOLVED: To efficiently perform ultrasonic flaw detection by using a TOFD method. SOLUTION: When vertical scanning is performed by a TOFD method, at first, for example, four continuous ultrasonic vibrators 11 1 -11 4 among ultrasonic vibrators provided to an ultrasonic probe 11 are excited to generate ultrasonic waves. In the reception of these ultrasonic waves, four ultrasonic vibrators 12 n -12 n-3 among the ultrasonic vibrators provided to an ultrasonic probe 12 are used. Next, ultrasonic vibrators are shifted by one to generate ultrasonic waves in ultrasonic vibrators 11 2 -11 5 , and these ultrasonic waves are received by ultrasonic vibrators 12 n-1 -12 n-4 . Thereafter, flaw detection is performed while the ultrasonic vibrators are successively shifted one by one, and ultrasonic waves are finally generated by using ultrasonic vibrators 11 n-3 -11 n to be received by ultrasonic vibrators 12 4 -12 1 . COPYRIGHT: (C)1999,JPO

Ultrasonic flaw detection apparatus and method

PROBLEM TO BE SOLVED: To provide a centerless grinding method and its device which can carry out a field grinding effectively by carrying out the form correction of a high strength metal bond super abrasive grain grinding wheel at a high accuracy and efficiently. SOLUTION: This standard centerless grinding device is provided with an electrode 1 provided opposing to a grinding wheel 12; a cutting giving means to advance the electrode 1 a specific amount to the grinding wheel 12; an electrode 12 provided opposing to the grinding wheel 12; a power source 16 to apply a voltage between the grinding wheel 12 and the electrode 1 or the electrode 11; and a grinding liquid feeding means 17 to feed a conductive grinding liquid between the grinding wheel 12 and the electrode 11 for dressing. A discharge is generated between the electrode 1 for truing and the grinding wheel 12, so as to correct the form of the grinding operation surface of the metal bond grinding wheel 12. A work is grinding processed while dressing the grinding wheel 12 by the electrolytic operation. COPYRIGHT: (C)1998,JPO

Centerless grinding method using metal bond grinding wheel, and its device

The present invention facilitates with high accuracy the adjustment of a minute angle degree, and also is capable of sufficiently securing the rigidity of the whole device after the adjustment and provides good operability, accuracy, and rigidity. Provided are a workpiece attaching body having a workpiece attaching surface and a rotating body rotatably supporting the workpiece attaching body. The rotating body has an inclination angle adjusting surface inclined relative to an axis of the rotating body, the workpiece attaching body has opposite to the workpiece attaching surface an inclination angle adjusting surface which is inclined relative to the workpiece attaching surface and which comes in surface contact with the inclination angle adjusting surface of the rotating body, and spherical coupling means is arranged which is for rotatably adjustably coupling the workpiece attaching body and the rotating body about a spherical center on an axis of the rotating body along both inclination angle adjusting surfaces. Thereby, the rotating body and the workpiece attaching body are relatively rotated about the spherical center along both inclination angle adjusting surfaces so as to adjust the inclination angle of the workpiece attaching surface.

Hirohisa Yamada

Papers

Centerless grinding method and centerless grinding device for rod work

Ultrasonic flaw detector

Ultrasonic flaw detection apparatus and method

Centerless grinding method using metal bond grinding wheel, and its device

Inclination angle adjusting device and workpiece attaching device