DE841804C - Direct measurement of the hardness values in Brinell and Vickers tests - Google Patents

Direct measurement of the hardness values in Brinell and Vickers tests

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Publication number
DE841804C
DE841804C DEC4037A DEC0004037A DE841804C DE 841804 C DE841804 C DE 841804C DE C4037 A DEC4037 A DE C4037A DE C0004037 A DEC0004037 A DE C0004037A DE 841804 C DE841804 C DE 841804C
Authority
DE
Germany
Prior art keywords
hardness values
vickers
brinell
tests
hardness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEC4037A
Other languages
German (de)
Inventor
Eberhard Dr-Ing Contius
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DEC4037A priority Critical patent/DE841804C/en
Application granted granted Critical
Publication of DE841804C publication Critical patent/DE841804C/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/40—Investigating hardness or rebound hardness
    • G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Description

Bei der Härteprüfung nach dein Brinell- und N.ickersverfahren- sind Meßeinrichtungen bekannt; -die darauf beruhen, daß nach Entfernung der Pruflast mit Hilfe optischer Geräte der Durchmesser bzw. die Diagonalen des Kugel- bzw Diamanteindruckes bestimmt werden. Nus diesen Längen wird der -Härtewert als Quotient Belastung : Eindrucksoberfläche errechnet oder aus vorbereiteten Tabellen abgelesen. In the hardness test according to your Brinell and N.ickers method Measuring devices known; -which are based on the fact that after removal of the test load with the help of optical devices the diameter or the diagonals of the spherical or diamond impression to be determined. Using these lengths, the hardness value is given as the quotient of the load: Impression surface calculated or read from prepared tables.

Der Erfindung liegt die Aufgabe zugrunde, eine Vereinfachung der Bestimmung des Härtewertes. durch unmittelbare Ablesung dieses Wertes vährend der Belastung zu erreichen. The invention is based on the object of simplifying the Determination of the hardness value. by reading this value directly during the To achieve load.

Diese Forderung wird mit Hilfe eines elektrischen Stromes erfüllt, der während der Prüfung des Werkstoffes durch die I)riickstelle fließt. Die-Eindrucksoberfläche wird zu einem elektrischen Kontakt, dessen Übergangswiderstand von der Größe des Druckes und der Fläche abhängig. ist. This requirement is met with the help of an electric current, which flows through the back during the test of the material. The impression surface becomes an electrical contact, the contact resistance of which is the same as the Pressure and area dependent. is.

Bei gleichem Druck und gleichem Strom ist der Spannungsabfall im Kontakt von der eindrucksoberfläche und damit von der Werkstoffhärte abhängig.At the same pressure and the same current, the voltage drop is in the contact depends on the impression surface and thus on the hardness of the material.

Die Messung des Härtewertes erfolgt mittels zweier Stromkreise. Im Belastungsstromkreis flieRt ein Strom von der Akkumulatorenbatterie 1 über den Schalter 2, über den Regulierwiderstand 3, durch den Strommesser 4, in den Druckkörper 5, durch den Kontakt 6, in den zu prüfenden Werk- -stoff 7 und über eine nach unten isolierte Unterlagsplatte 8 zur Batterie zurück. Im Meßstromkreis fließt infolge des Spannungsabfalles im Kontakt 6 ein Strom vom Druckkörper 5 durch den Spannungsmesser 9, durch den Regulierwiderstand 10, durch den federnden Taststift II in den Werkstoff 7. Der Schalter 2 ist mit der Vorrichtung zum Absetzen der Prüflast zwangsläufig gekuppelt, damit zur Sicherultg des Spannungsmessers g bei unbelastetem oder - abgehobenem Druckkörper gdie Apparatur stromlos ist. Der Regulierwiderstand 3 dient zur Einstellung konstanter Stromstärke hei verschiedenen Leitfähigkeiten oder verschiedenen Belastungen, Der Regulierwiderstand 10 ist für Eichung des Spannungsmessers g bestimmt und kann für genaueste Härtebestimmungen als Vorschaltwiderstand zum Ausgleich der verschiedenen Leitfähigkeiten der zu prüfenden Metalle verändert werden. Der Spannungsmesser g erhält zwei Skalen für Brinell- und Vickershärte. The hardness value is measured using two electrical circuits. in the In the load circuit, a current flows from the accumulator battery 1 via the switch 2, via the regulating resistor 3, through the ammeter 4, into the pressure body 5, through the contact 6, into the material to be tested 7 and via a downwards insulated base plate 8 back to the battery. In the measuring circuit flows as a result of the voltage drop in contact 6, a current from the pressure body 5 through the voltmeter 9, through the regulating resistor 10, through the resilient stylus II into the material 7. The switch 2 is inevitable with the device for placing the test load coupled, so that to safeguard the voltmeter g with unloaded or - lifted Pressure hull g the apparatus is de-energized. The regulating resistor 3 is used for setting constant current intensity with different conductivities or different loads, The regulating resistor 10 is intended for calibration of the voltmeter g and can for the most precise hardness determinations as a series resistor to compensate for the various Conductivity of the metals to be tested can be changed. The tension meter g receives two scales for Brinell and Vickers hardness.

Claims (4)

Der wesentliche Fortschritt der Erfindung beruht darauf, daß bereits während der Prüfung der Härtewert am Spannungsmesser ahgelesetl werden kann. Es wird die Zeit für das Ausmessen der Durchmesser oder der Diagonalen und für das Berechnen oder Aufsuchen der Härtewerte in Tabellen erspart PATENTANSPRÜCHE: l. Messung der Härtewerte bei 13rinell- und Vickersprüfung dadurch gekennzeichnet, daß während der. Prüfung ein elektrischer Strom durch die Eindrucksfläche flieht. The main advance of the invention is based on the fact that already During the test, the hardness value can be read on the voltmeter. It is the time for measuring the diameter or the diagonals and for the Calculating or looking up the hardness values in tables saves PATENT CLAIMS: l. Measurement of hardness values in the case of rinell and Vickers tests characterized by that during the. Examination an electric current flees through the indentation surface. 2. Messung nach Anspruch 1, dadurch gekennzeichnet, daß der Spannungsabfall in der Druckstelle mittels eines Spannungsmessers gemessen wird, dessen Skalen Brinell- und Vickershärtewerte anzeigen. 2. Measurement according to claim 1, characterized in that the voltage drop is measured in the pressure point by means of a tension meter, the scales of which are Brinell and display Vickers hardness values. 3. Messung nach Anspruch I, dadurch gekennzeichnet, daß der Schalter (2) mechanisch mit der Auslösesorrichtung der Prüfbelastung gekuppelt ist. 3. Measurement according to claim I, characterized in that the switch (2) is mechanically coupled to the triggering device of the test load. 4. Messung nach Anspruch I, dadurch gekennzeichent, daß der Vorschaltwiderstand (10) zum Spannungsmesser entsprechend der Leitfähigkeit der Prüfwerkstoffe verändert werden kann. 4. Measurement according to claim I, characterized in that the series resistor (10) changed to the voltmeter according to the conductivity of the test materials can be.
DEC4037A 1951-04-05 1951-04-05 Direct measurement of the hardness values in Brinell and Vickers tests Expired DE841804C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEC4037A DE841804C (en) 1951-04-05 1951-04-05 Direct measurement of the hardness values in Brinell and Vickers tests

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEC4037A DE841804C (en) 1951-04-05 1951-04-05 Direct measurement of the hardness values in Brinell and Vickers tests

Publications (1)

Publication Number Publication Date
DE841804C true DE841804C (en) 1952-06-19

Family

ID=7013256

Family Applications (1)

Application Number Title Priority Date Filing Date
DEC4037A Expired DE841804C (en) 1951-04-05 1951-04-05 Direct measurement of the hardness values in Brinell and Vickers tests

Country Status (1)

Country Link
DE (1) DE841804C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0052857A1 (en) * 1980-11-25 1982-06-02 Unisearch Limited Hardness tester
WO1986006833A1 (en) * 1985-05-03 1986-11-20 Unisearch Limited Measuring hardness by contact resistance of indenter material
WO1988003644A1 (en) * 1986-11-12 1988-05-19 Unisearch Limited Hardness measuring with a diamond indenter having surface treatment or coating

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0052857A1 (en) * 1980-11-25 1982-06-02 Unisearch Limited Hardness tester
WO1986006833A1 (en) * 1985-05-03 1986-11-20 Unisearch Limited Measuring hardness by contact resistance of indenter material
WO1988003644A1 (en) * 1986-11-12 1988-05-19 Unisearch Limited Hardness measuring with a diamond indenter having surface treatment or coating

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