Abrading – Precision device or process - or with condition responsive... – With feeding of tool or work holder
Patent
1993-10-18
1995-08-22
Rachuba, Maurina T.
Abrading
Precision device or process - or with condition responsive...
With feeding of tool or work holder
451 24, 451242, B24B 4900
Patent
active
054434114
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a grinding device for the machining, including facing, of resilient or semi-resilient materials.
Two maching techniques based on grinding wheels are known: the so-called "scanning" technique in which a grinding wheel, the width of which is less than the length of the workpiece to be machined, "scans" said workpiece by being moved in front of it at the desired distance, and the so-called "in-feed" technique in which the workpiece to be machined is cut by a grinding wheel, the width of which is at least equal to the length of this workpiece, so as to machine the latter without having to move it sideways.
Each of these techniques possesses advantages and disadvantages.
The "scanning" technique has the double advantage over the "in-feed" technique that it enables smaller grinding wheels to be used and that it allows workpieces made of resilient or semi-resilient materials to be machined.
In the "in-feed" technique, the relative movement between grinding wheel and workpiece being machined is radial in relation to the latter, and, if the workpiece is made of a material which is that bit resilient, surface compression inevitably occurs which prevents having complete control not only over the correct dimensioning of the workpiece, but also over its final surface condition. In addition, in the case of somewhat long workpieces, the pressure exerted by the grinding wheel always causes the workpiece to bend, to a greater or lesser degree, during machining and the result of this bending is to give the finished workpiece, to a greater or lesser extent, an undesirable crown.
This is why, for machining workpieces made of resilient or semi-resilient materials, the "scanning" technique is used.
However, the latter has, compared with the "in-feed" technique, the disadvantage of requiring a longer time insofar as it is absolutely necessary that the grinding wheel "scans" the entire length of the workpieces to be machined.
This drawback may certainly be overcome to a certain degree by increasing the number of machining machines supervised by a given person. However, this means an additional investment running the risk, ultimately, of canceling out any economic benefit from this increase in production.
SUMMARY OF THE PRESENT INVENTION
The object of the present invention is to provide a grinding device for the machining, including facing, of workpieces made of resilient or semi-resilient materials, enabling the "in-feed" technique to be used while still maintaining the advantages of the "scanning" technique as regards meeting dimensional requirements and final surface condition.
For this purpose, the grinding wheel operating in "in-feed" mode is equipped with means which are capable of ensuring, for a certain time, at the end of a machining operation, that the workpiece being machined is held in such a way that its rotation spindle is, at its supports, at a distance in relation to the rotation spindle of the grinding wheel equal to the sum of the theoretical radius of the desired workpiece and the radius of the grinding wheel.
This arrangement makes it possible, after rough-machining, to obtain a workpiece of precise dimensions, and therefore having the precise shape, and of as fine a surface condition as desired, this being so even for workpieces made of resilient materials.
In an advantageous embodiment exhibiting this characteristic, it is an airdraulic device which holds the workpiece being machined, subject to information from a feed via a timing device, when said workpiece reaches the desired position.
According to a second characteristic, the device according to the invention is provided with means allowing, during the rough-machining period, a slight drift of the rotation spindle of the workpiece being machined.
In an advantageous embodiment exhibiting this characteristic, two open bearing surfaces are provided, each of which is constituted by a component which includes two surfaces arranged perpendicularly to each other, on which surfaces the spindle of th
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Bastin Jacques
Rouyer Louis
Createc Rollers
Rachuba Maurina T.
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