Abrading – Precision device or process - or with condition responsive... – With feeding of tool or work holder
Patent
1996-02-07
1998-07-28
Eley, Timothy V.
Abrading
Precision device or process - or with condition responsive...
With feeding of tool or work holder
451 5, 451160, 451158, B24B 4900, B24B 5100
Patent
active
057855781
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to equipment for the grinding of material samples, for instance microstructure grinding of a rock sample assembled on a microscope slide.
The extraction of oil and gas from an underground formation (rock) it is of basic importance to obtain knowledge of the nature of this formation. This is obtained inter alia by studying microstructures of the rock in question in a microscope to form an idea of the rock's porosity and structure. A grinding is produced at first by cutting a piece of the rock and then impregnating it. The impregnated piece is then surface ground before it is assembled on a microscope slide and finally ground.
The most common grinding method is based on so-called "patching". Silicon carbide grain in a water suspension is supplied to a rotary cast iron disk. The material samples (the microscope slide with the samples) are assembled with one or more rotary holders and are pressed towards the rotary cast iron disk. With this type of equipment and method the silicon carbide grains as such act as a grinding compound, and the thickness of the samples is reduced gradually to about 30 .mu.m.
The know method and equipment is, however, encumbered with several disadvantages. Firstly, the grinding grains are pressed into the epoxy plastic in the material samples during the "patching" process and appear as black particles in the pores in the ground material samples. This, in the worst case, may make the samples unsuitable for further analyses. Secondly, the rotary cast iron disk may obtain an oblique surface during the grinding operation and have to be adjusted frequently. This involves considerably more work. The obliquity in the cast iron disk may also lead to considerably unevenness in the material samples in which case they could not be used for further testing.
A further disadvantage of the known equipment is that it requires supervision by an operator and is therefor expensive to us.
SUMMARY OF THE INVENTION
With the present invention there is provided equipment for grinding material samples where the disadvantages mentioned above are eliminated, i.e. which material samples, samples, and
The equipment according to the invention includes a rotating table (a turntable) on which the material samples are releasably provided. The grinding thereby takes place in at least one step by means of at least one vertically moveable grinding spindle arranged above the turntable.
BRIEF DESCRIPTION OF THE DRAWINGS
FIGS. 1(a)-(c) show (a) a front side view, (b) a side view and (c) a top view of grinding equipment in accordance with the invention;
FIG. 2 shows, on a larger scale, a support for a grinding spindle included with the equipment of FIGS. 1(a)-(c); and
FIGS. 3(a) and (b) show, as seen from the top and on an enlarged scale, a turntable according to the present invention and a detail thereof, respectively.
FIGS. 4 show two examples of material samples, which are ground by means of, in FIG. 4 (a), grinding equipment according to the invention, and in FIG. 4(b), known equipment by "patching" respectively.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The equipment according to the invention includes, as shown in FIG. 1, four main components, namely, a frame and console structure 1, a grinding spindle arrangement 2, a turntable 3 and a control unit 4.
The frame and console structure 1 is designed to absorb great amounts of energy, during the grinding operation when the equipment is used, and is therefore made of strong steel beams and stiffeners 5, 6 and 7 to ensure sufficient stability and prevent unevenness of the grinding samples. Concerning further details about the frame and console structure, such details lie within the competence of a person skilled in the art, and will therefore not be further described here.
The grinding spindle arrangement 2 comprises, as shown in FIG. 1, two grinder spindles provided above the turntable 3, one rough and one fine spindle, each being driven by an electric motor 8. Each spindle and motor unit 2, 8 are
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Patent Abstracts of Japan, vol. 11, No. 76, M-569, abstract of JP, A, 61-230853 (Shibayama Kikai K.K.), 15 Oct. 1986.
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Thoresen Bj.o slashed.rn
Thorkilsen Geir
Banks Derris H.
Eley Timothy V.
Norsk Hydro a.s.
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