DE637402C - Method for clamping wires or test rods in material testing machines - Google Patents

Method for clamping wires or test rods in material testing machines

Info

Publication number
DE637402C
DE637402C DEH142206D DEH0142206D DE637402C DE 637402 C DE637402 C DE 637402C DE H142206 D DEH142206 D DE H142206D DE H0142206 D DEH0142206 D DE H0142206D DE 637402 C DE637402 C DE 637402C
Authority
DE
Germany
Prior art keywords
material testing
testing machines
test rods
clamping wires
test
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
DEH142206D
Other languages
German (de)
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.)
WILLY HELLWIG DIPL ING
Original Assignee
WILLY HELLWIG DIPL ING
Publication date
Priority to DEH142206D priority Critical patent/DE637402C/en
Application granted granted Critical
Publication of DE637402C publication Critical patent/DE637402C/en
Expired legal-status Critical Current

Links

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
    • G01N3/02—Details
    • G01N3/04—Chucks

Description

Drähte und dünne Probestäbe wurden, wenn sie an den Enden keine Verdickungen aufwiesen, bisher in der Weise in der Prüfmaschine festgehalten, daß sie zwischen Keilbacken gelegt wurden, wodurch aber an den Einspannstellen Oberflächenbeschädigungen hervorgerufen wurden, die dazu Anlaß gaben, daß der Bruch meist unmittelbar an der Einspannstelle, und zwar vorzeitig erfolgte.Wires and thin test rods, if they did not have any thickening at the ends, were so far held in such a way in the testing machine that they are between wedge jaws were laid, but this caused surface damage at the clamping points which gave rise to the fact that the break usually occurs directly at the clamping point, and that was done prematurely.

Dieser Übelstand wird nun durch vorliegende Erfindung dadurch beseitigt, daß man den hohen Schrumpfdruck eines erhitzten Stahlringes über ein ein- oder mehrmal geschlitztes Zwischenstück auf die einzuspanig nende Probe einwirken läßt.This drawback is now eliminated by the present invention in that one the high shrinkage pressure of a heated steel ring over a one or more slit Intermediate piece can act on the sample to be spanned.

An Hand der Abb. 1 und 2 sei das erfindungsgemäße Verfahren näher erläutert.The method according to the invention will be explained in more detail with reference to FIGS. 1 and 2.

α bedeutet einen Konus, der eine Bohrung d aufweist, die mit dem Durchmesser des einzuspannenden Drahtes oder Probestabes. übereinstimmt. Durch den Schlitz c, der über die Bohrung hinausgeht, erhält der Konus die Eigenschaften einer Feder. Über den Konus wird nun der erwärmte Ring δ mit leichten Schlägen geschoben, und dann das ganze System abgekühlt. Das Aufschlagen des Ringes auf den Konus bedingt, daß die Unebenheiten, die zwischen Bohrung d und dem eingespannten Draht vorhanden sind, verschwinden. Durch. die Federwirkung des Konus α wird alsdann der volle Schrumpfdruck auf die Probe übertragen. Durch die schnelle Abkühlung nach Auftreiben des Ringes wird der eingespannte Draht nicht wesentlich erwärmt, so daß keine Gefügeänderungen des Drahtes eintreten können.. α means a cone which has a bore d that is the same as the diameter of the wire or test rod to be clamped. matches. Through the slot c, which goes beyond the bore, the cone has the properties of a spring. The heated ring δ is now pushed over the cone with light blows, and then the whole system is cooled. The impact of the ring on the cone causes the unevenness that exist between the hole d and the clamped wire to disappear. By. the spring action of the cone α is then transferred to the specimen with the full shrinkage pressure. Due to the rapid cooling after the ring has been driven open, the clamped wire is not significantly heated, so that no structural changes in the wire can occur.

Claims (1)

Patentanspruch:Claim: Verfahren zum Einspannen von Drähten oder Probestäben in Werkstoffprüfmaschinen, dadurch gekennzeichnet, daß der Schrumpfdruck eines erhitzten Stahlringes (ö) über ein ein- oder mehrmal geschlitztes Zwischenstück [λ) auf den einzuspannenden Prüfling übertragen wird.Method for clamping wires or test rods in material testing machines, characterized in that the shrinkage pressure of a heated steel ring (ö) is transmitted to the test piece to be clamped via an intermediate piece [λ) which is slotted one or more times. Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DEH142206D Method for clamping wires or test rods in material testing machines Expired DE637402C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH142206D DE637402C (en) Method for clamping wires or test rods in material testing machines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH142206D DE637402C (en) Method for clamping wires or test rods in material testing machines

Publications (1)

Publication Number Publication Date
DE637402C true DE637402C (en) 1936-10-28

Family

ID=7178882

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH142206D Expired DE637402C (en) Method for clamping wires or test rods in material testing machines

Country Status (1)

Country Link
DE (1) DE637402C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2583885A (en) * 1944-07-01 1952-01-29 Amsler Alfred J & Co Gripping means for specimens in pulsating testing machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2583885A (en) * 1944-07-01 1952-01-29 Amsler Alfred J & Co Gripping means for specimens in pulsating testing machines

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