Abrasive tool making process – material – or composition – With carbohydrate or reaction product thereof
Patent
1989-05-11
1991-09-03
Parker, Roscoe V.
Abrasive tool making process, material, or composition
With carbohydrate or reaction product thereof
5116587, 51347, 51 5D, 51262T, E01B 3117
Patent
active
050441264
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tangential grinding machines.
Tangential grinding machine are known comprising a grinding device consisting essentially of a grinding wheel of abrasive material which when rotated removes by abrasion a part of the material with which it comes into contact.
Currently known grinding machines comprise either a fixed structure and means for feeding the workpiece towards the abrasive grinding wheel, or an abrasive grinding wheel support structure mobile along the workpiece which is fixed. The particular application and the specific requirements of the workpiece determine the use of one or other type of machine. If for example a rolled section leaving a rolling mill is to be ground, the machine will obviously be of the fixed type, whereas if for example an already laid railway rail is to be ground, the machine will obviously be of the mobile type.
However, independently of the type of structure used, the known grinding devices, ie the assembly consisting of the abrasive tool or tools, its or their rotary drives, adjustment and replacement systems and all other accessory members required for correct operation, they currently suffer a series of limitations and drawbacks which the present invention proposes to obviate.
One of these drawbacks is that each grinding wheel generally consists of a disc of abrasive material and is intended to grind with its circumferential surface at a peripheral speed within a precise and narrow range of values. As the grinding wheel wears with time, and thus its grinding circumference decreases, it is necessary on the one hand to increase its angular speed and on the other hand to shift its axis of rotation with respect to the workpiece, so as to always ensure mutual contact. In all cases, complicated adjustment and control equipment are required, but this does not obviate the need to replace the grinding wheel very frequently, ie while the amount of abrasive material still unused is considerable.
In addition to all the aforesaid drawbacks, which relate to the grinding device of any tangential grinding machine, there are also particular drawbacks encountered in grinding machines used specifically for rail profile restoration in railways, tramways and/or underground railways.
One of these drawbacks is that known rail grinding machines generally use cup grinding wheels, which operate along a narrow longitudinal strip of the rails to be ground. A large number of grinding wheels are therefore required, and as these are mounted on trolleys a large number of these latter are necessary for grinding the adjacent strips which together make up the entire rail profile. The result is an overall space requirement which is often unacceptable, and an imperfect grinding result because of the inevitable rail faceting which appears on termination of the work. In addition, those cup grinding wheels which grind the rail lateral surfaces are impeded by the presence of natural obstacles such as points, guide and retaining plates at the points and, in the particular case of tramlines, the cement and asphaft and also the actual counterweb of the rail itself.
A further drawback of known grinding machines with cup grinding wheels is that said grinding wheels, which both grind the rails and create the reference plane at one and the same time, are consumable elements and as such they change with time and are unsuitable for forming a proper reference plane. This drawback, which in the case of short longitudinal rail undulations (up to 30 cm) can be overcome by the actual dimensions of the cup grinding wheels themselves (which can have a diameter of up to 30 cm), becomes more apparent in lengthy longidudinal undulations, which cannot be covered by the cup grinding wheel dimensions.
A further drawback of known rail grinding machines is that the cup grinding wheels must generally operate simultaneously on both rails for mass balancing reasons. This makes it more difficult to grind a single rail such as the central earth rail or outer side feed rail of underground railways. In addition when
REFERENCES:
patent: 1511165 (1924-10-01), Jaeger
patent: 2114454 (1938-04-01), Perazzoli
patent: 2148766 (1939-02-01), Mall
patent: 2746217 (1956-05-01), Breisch
patent: 2767523 (1956-10-01), Vasbinder
patent: 4050196 (1977-09-01), Theurer
Parker Roscoe V.
Rotrafer S.p.A.
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