DD296362A5 - DEVICE FOR EXAMINATION OF TURN SURFACES WITH ULTRASOUND SURFACE WAVES - Google Patents

Abstract

The invention relates to a device for the examination of indexable inserts with Ultraschallloberflaechenwellen and preferably finds in the test for surface defects and the expected life time application. The object of the invention is to avoid the complicated displacement of the transmitter between the first and second measurement, which is necessary to determine the speed in order to avoid the defined distance Dl. This object is achieved according to the invention in that two transmitters are arranged in the measuring head in the defined distance D1 and these emit US signals one after the other. These are recorded by the receiver and evaluated by a microcomputer integrated in the ultrasonic measuring instrument. From the calculated speed of the ultrasonic surface waves conclusions can be drawn on the quality of the indexable inserts. By means of the device according to the invention, the masticating times can be substantially reduced {insert; Indexable insert; Ultraschalloberflaechenwellen; Oberflaechenfehler; Life}

Description

-2- 296 3G2

The Eintfittswinkol α results from the Snolliusschon calculation goset

sin α C _L sin β ⁼ C ₀

sin a - entrance angle dor Longittidinalwolle In piacryl

sin β - exit angle of the ultrasonic globe

Cl - sound velocity of the longitudinal dwarf in the piacrylic body

C ₀ , - velocity of the ultrasonic surface waves

Advantageously, the recording for the transmitter and the receiver ous Piacryl should exist and the angle α are chosen so that ultrasonic surface waves arise. Each transmitter is connected to a separate output of the ultrasonic meter.

The transmitters successively emit a signal which, in the form of ultrasonic surface waves, runs along the open spaces to the receiver. The successive signals arriving at the receiver of the ultrasound measuring device are evaluated in the integrated microcomputer in the form of pulse repetition frequencies or pulse transit times, and the velocity of the ultrasonic surface wavonon is calculated therefrom. The inventive integration of two transmitters in the measuring head eliminates the hitherto complex displacement of a transmitter between the two measurements to be performed and the necessary thereby determining the defined distance ΔΙ. The time for the measurement decreases significantly. Advantageously, different sized cutting plates can be measured with a device. By tilting the two Piacrylteile against each other can be measured in addition to square and rhombic indexable inserts. A small area of the open space between the transmitters and the receiver which the ultrasonic surface waves do not pass through is not detected in the measurement. It is therefore necessary to turn the indexable insert 90 ° or 180 ° after the first measurement and make another measurement.

By the opposite arrangement of two measuring devices all open spaces are measured. A rotation of the cutting plate is no longer necessary.

By measuring the speed of the ultrasonic surface wavon, statements can be made about the expected service life of the indexable inserts. For coated indexable inserts, statements about the quality and adhesion of the coating are possible.

exemplary

The invention will be explained in more detail using an exemplary embodiment with reference to drawings. Show it

Fig. 1: front view of the invention

Fig. 2: Front view using two opposite measuring heads Fig. 3: Coupling with the ultrasonic measuring device.

The device according to the invention consists, according to FIG. 1, of a base plate 1, to which a pacrocrylic part 2 for receiving the transmitters 4a, 4b and a pacrocrylic part 3 for receiving the receiver 5 are fastened. According to the shape of the indexable insert 6, the piacryl parts 2, 3 have receiving surfaces 7 which are inclined by 90 ° relative to one another.

At the angle of incidence α = 45 °, the transmitters 4 a and 4 b are arranged at the piacryl part 2 by the defined distance ΔΙ. On Piacrylteil 3 is the receiver. 5

Each transmitter 4 a, 4 b is connected to an output 8 a, 8 b of the Ultraschallmeßgerätes. The receiver 5 is coupled to the input E of the meter. (Fig.3)

When carrying out the measurements according to FIG. 1, a small area of the indexable insert is not detected because it is not passed through by the surface waves. The indexable insert must therefore be measured again after a rotation of 90 ° or 180 "in order to include this area in the investigation.

A rotation of the indexable insert is not required if, according to FIG. 2, two opposite measuring heads are used.

Here, two successive measurements are made with the measuring heads.

In the ultrasonic measuring device, a microcomputer is integrated, which controls the temporal transmission of the signals and from the input value (pulse repetition frequencies or pulse transit times) determines the speed of the ultrasonic surface waves, which is made visible on the ultrasound device by the display A.

Claims (2)

1. A device for examining Wendesohneidplatten with ultrasonic surface waves using the sing-around principle and a Ultraschallmeßgerät with integrated microcomputer, which evaluates pulse repetition frequencies or pulse transit times and determines the speed of the ultrasonic surface waves, characterized in that the Ultraschallmeßkopf two at a defined distance .DELTA.Ι to each other staggered transmitter (4a, 4b) and a receiver (5), wherein the two transmitters and the receiver are arranged on corresponding Piacrylteilen at an angle such that ultrasonic surface waves arise, which rotate around the free surfaces of the indexable inserts. 2. Device according to claim 1, characterized in that each transmitter (4a, 4b) is connected to a separate output (8a, 8b) of the Ultraschallmeßgerätes. For this 1 page drawings Field of application of the invention The invention relates to a device for examining indexable inserts with ultrasonic surface waves, consisting of a special Ultraschallprüfeinrichtung and a Ultraschallullmgerät with integrated microcomputer, with the open spaces of indexable inserts are examined with ultrasonic surface waves to obtain statements about surface defects and the expected life. Characteristic of the known state of the art It is known that with the help of the acoustic emission analysis indexable inserts are tested for their nature. Here, the sound emission is measured and assessed, which arises when a probe tip is pulled under increasing load on the free surface of the insert. This method works only partially destructive and takes a relatively long time (Hintermann, H.E., lecture to the Vl. Surface Colloquium, 1984, Karl Marx City). In all previously known methods for material testing with ultrasonic surface waves (Krautkrämer, J., Krautkrämer, H "material testing with ultrasound, Springer Verlag, 1986), which are based in particular on the determination of the speed of the surface waves, it is necessary after the first measurement to change the distance between transmitter and receiver defined and then perform a second measurement. In this case, the pulse transit times t or the pulse repetition sequences ft, measured using the oing-around method, can be determined. From the measured values at different transducer distances, the speed of the ultrasonic surface waves shall be calculated as follows: ΔΙ ΔΙ c = ti - t ₂ J 1_ ff, ff. c - velocity of the ultrasound surface waves ΔΙ - distance change between transmitter and amplifier ti, ff, - transit time or pulse repetition frequency with a large transducer distance t ₂ , ff, - transit time or pulse repetition frequency with a small transducer distance The determination of ΔΙ must be made anew for each measurement and be carried out very accurately, at least in the μιη range. This measuring method is very time consuming. Object of the invention The goal of Dio's invention is to measure indexable inserts non-destructively with little expenditure of time. Explanation of the essence of the invention The invention is based on the object to develop a device for the investigation of indexable inserts with ultrasonic surface waves, which allows, without the time-consuming defined change in the distance between transmitter and receiver after the first measurement and the associated complex determination of this change in distance a reliable material testing terms Surface defects and the expected service life of the indexable inserts. This object is achieved according to the invention using the sing-around principle and a Ultraschallmeßgerät with integrated microcomputer, which evaluates pulse repetition frequencies or pulse transit times and determines the speed of Uhraschalloberflächenwellon, achieved in that the Ultraschallmeßkopf has two arranged at a defined distance 1 transmitter and a receiver , The transmitters and the receiver are mounted on two pacacrylic parts so that ultrasonic surface waves travel in the faces of the indexable inserts, which rest on the receiving surfaces of the piacentic parts and are coupled with oil.