DE2141566B2 - TOOL FOR CLAMPING FLAT AND CIRCULAR SAMPLES IN MATERIAL TESTING MACHINES - Google Patents

Description

n, r invention is based on the object, a one it in the first case in the.

Toothing to be generated no wear of the SP ^? ™haben _Gesta i _tU ng

The clamping jaw to get on its cuboid- ^ mfaoS encloses and the locking In ^ ² J

from from into the holder, without cüeses Implementation

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XU Zurich dl 'light e & sefbartcit der Clamping jaw does not affect the latter being void he, ',, .. "", -ade made much easier by this, that the locking element holding the clamping jaw

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^^ differently shaped flat mn ? »™ Ssma

_ver c _e henesSnannpnsma, toothed ! f ^^^ g ^ JL toothed

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them existing toothed 30 n.cht

Kontage or the replacement of the clamping jaws 35 multi-part ^^ ^? _z w prisms is much easier to make. Hold down 5 nu

particularly advantageous embodiment schiebhch gelagc

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₆ Τ guide pieces 6 sliding holding pieces 5 size - - _{the other type} of hy-

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Clamping jaw te », the

around

Able to handle thrust. d, e at the location fm ^ ud, y,

2Ä | _ri smen 4 «with a 5? Mistake. This is just *.

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wedge to provide several toothed striking surfaces on ae prisms, which can be designed either the same or different. As a result d Pl _u ^ _{the over} d ^ g _{gl extend} the pin e

especially in those cases where the stresses are particularly high.

While the one-piece clamping jaw 4 'is provided with a profile-ground flat toothing 14 and serves to clamp flat specimens, the two clamping prisms 4 ″ according to FIG. 4 are at their facing front edge provided with profile-ground toothed inclined surfaces 15, which are used to clamp round specimens.

In the case of FIG. 5, the clamping prism 4 ^{ΙΠ is provided} with two differently designed flat-toothed inclined surfaces 15 ¹ , 15 "which, depending on the installation of the two clamping prisms, result in different specimen diameter clamping areas - or clamping surfaces be provided so that further specimen diameter clamping areas can be realized with it.

In the case of FIG. 6, the clamping prism 4 ^{1V is provided} with four identically designed toothed clamping surfaces 15 ^m which can be used one after the other by correspondingly reversing the sides or turning the clamping prisms. This design of the clamping jaws is particularly recommended for those applications in which a large throughput of samples of approximately the same diameter is used and the samples are subjected to relatively high loads, so that correspondingly high wear of the clamping surfaces on the clamping prisms must be expected. By simply turning the clamping prisms, the clamping surfaces can be opened one after the other

ίο use.

The present invention is not restricted to the exemplary embodiments shown. For example, the wedge-shaped retaining piece 5 does not necessarily have to be closed ^{around the recess 5 1.} Rather, for example, the top of the holding piece or its recess 5 'can also be open and closed by a laterally, ie in the direction of the pins 10 and 11 to be moved slide, which at the same time the clamping jaw or the

ao clamping prisms in the holding piece 5. The ones around closed design of the holding piece 5 is much more advantageous, especially not only because of this Tensile and lateral forces, but also shear forces can be better absorbed.

1 sheet of drawings

Claims (6)

1 2 zontally arranged, from the side adjustable claims: screw that engages in a relatively small before jump, which is located on the clamping jaw 1. Tool for clamping flat specimens and with which they protrude into a correspondingly small round specimen in the clamping heads of material saving in the holding piece. If the clamping testing machines, especially for tensile tests, are to be replaced, the holding piece heads, which are essentially semicylindrical on smooth rods without shoulder or thread, must consist of a holding piece with a recess that can be slid in the clamping head together with a wedge-shaped intermediate piece Clamping head can be removed. Since the locking element, which can be adjusted by means of a clamping head transversely to the clamping direction, surrounds the wedge-shaped intermediate pieces in a shaped manner, the respective interchangeably fastened clamping jaws must be lifted out upwards with cuboid pieces, which requires the deformed outer circumference, which means laborious expansion work ,
The clamping jaws are provided at their recess (5 ¹ ) facing the specimen, the clamping jaw (4) εη ih- 15 facing side, as a rule, with a so-called rem cuboid outer circumference. The specimen is gripped from two sides and the locking element (10 or 11) from the sides by a wedge piece or its clamping front in the holding piece (5) without having to dismantle this jaw, which must be pushed in due to the test load. stung the wedge pieces in the wedge mouth of the clamping heads of the 2. Clamping tool according to claim 1, that 20 materials testing machine are tightened. The characterized in that the recess (5 ¹ ) exchangeable fastening of the clamping jaws in the wedge pieces in the retaining piece (5) is closed laterally all around has the advantage that the clamping jaws and the locking element can be replaced cost-saving after wear or threaded pin from a plug (11 or 10) exists. This can also create different shapes 3. Clamping tool according to claims 1 25 of clamping jaws for the respective material test und2, characterized in that the plug-in can easily be used, for example for flat specimens or or threaded pin (11 or 10) each half in for round specimens. In particular for round specimens who have grooves (13), one of which is used in one longitudinal side of different forms of clamping toothing on the wall of the recess (5 ¹ ) and the other. Usually there are toothed clamping prisms in the adjacent side wall of the clamping jaw 30 or semicircular toothed clamping troughs that are incorporated (4 ¹ or 4 ¹¹ ). are more or less different in shape to the sample. 4. Clamping tool according to claims 1 nestle. to 3 with two clamping jaws that are divided in the middle The production of the clamping prisms, which are characterized by milling, planing or Drenet, that the clamping prisms (4 ") are at several or ₃₅ hen Edges of the finish machining lying in the clamping direction are hardened, but finished with toothed inclined surfaces (15 ¹ or 15 "or depending on the condition the tooth tips are decarburized and 15 ¹¹¹ ). as a result, they do not achieve the desired hardness. 5. Clamping tool according to claim 4, since recently, therefore, the clamping jaws are characterized in that all toothed 40 openings are produced in the profile grinding process, with inclined surfaces (15 '") on the clamping prisms (4 ^1V ), the clamping jaws are hardened beforehand and which are designed in the same way , in such a way that it is carried by the corresponding decarburized surface when profile grinding with sloping ropes or turning the. After this process, general clamping prisms are to be used one after the other 6. Clamping tool according to claim 4, there- 45 clamping jaws produced. On the other hand, have to go through characterized in that the toothed clamping of round specimens has two-part clamping jaws in Inclined surfaces (15, 15 ") on the prism-shaped clamping prisms are used to make the toothed (4 "') are designed differently in such a way that they can be used to grind inclined or clamping surfaces depending on the insertion of the clamping prisms, different, in turn, requires special wedge pieces because this is the case Sample diameter clamping areas to be obtained during the test in the two clamps are. side forces occurring in the prisms Need to become. The cost of such special wedge pieces are considerable depending on the design.
With known clamping tools of the above type The invention relates to a tool for clamping 55 are the clamping jaws or prisms mostly swell of flat and round specimens in the clamping head tail-shaped in appropriately undercut, fen of material testing machines, especially for guides located on both sides of the recess in the Tensile tests on smooth rods without shoulder or wedge-shaped holding pieces, whereby the fastening threaded heads, Consists of one in the clamping head movement of the clamping jaws through one that can be pushed in Holding piece with a recess and 60 direction to be placed on and with the holding piece too one takes place therein by means of a cover strip screwed transversely to the tensioning direction. Such an exhibitor Interchangeable interchangeable clamping jaw attachment in the wedge-shaped fixed Clamping jaw with cuboid outside holding piece, however, requires a considerable amount of equipment, workload and is also proportionate In a known clamping tool above G5 difficult to make because the removal and Art (according to German Auslegeschrift 1 164124) Replace the cover strip regularly consists in removing the wedge-shaped holding pieces from the clamping locking element, which holds the clamping jaw interchangeably from one of the heads of the factory testing machine in the holding piece.