Coating processes – Direct application of electrical – magnetic – wave – or... – Electromagnetic or particulate radiation utilized
Patent
1996-04-04
1999-06-08
Padgett, Marianne
Coating processes
Direct application of electrical, magnetic, wave, or...
Electromagnetic or particulate radiation utilized
427596, 148512, 148582, 148583, C23C 1414, C23C 400, C21D 904
Patent
active
059103434
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for improving the adhesitivity of surface refined parts to the body of railway wheels, which surface refined parts have been produced by treating the railway wheel with high energy generated preferably by laser radiation.
The present invention also relates to a simple method for obtaining said device.
BACKGROUND OF THE INVENTION
DE, C1, 35 09 582 teaches a railway wheel which has been surface refined or improved by means of laser radiation. However, the thickness of the surface refined parts is not maximized and said parts have therefore a substantial thickness. The results in that there is a great risk that said parts loosen, i.e. that so called flaking out occurs.
The object of the present invention is to avoid this drawback, which according to the invention is arrived at by providing the abovementioned device with the characterizing features of the present invention.
SUMMARY OF THE INVENTION
A method for obtaining said device comprises according to the invention the characterizing features of the present invention.
Since the device having said characterizing features ensures that the Hertzian pressure is substantially carried by the body of the railway wheel, loosening of the surface refined parts from the body is prevented or obstructed.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be further described below with reference to the accompanying drawings, wherein
FIG. 1 schematically illustrates a railway wheel on a rail;
FIG. 2 schematically illustrates a surface treatment of the railway wheel carried out in accordance with the method of the invention, whereby said surface treatment is a surface application;
FIG. 3 schematically illustrates a substantial magnification of a section of an area of the railway wheel at which surface application or surface coating according to FIG. 2 has occured;
FIG. 4 schematically illustrates a surface treatment of the railway wheel according to the present method, whereby said surface treatment is a surface impregnation;
FIG. 5 illustrates a substantially magnified section of an area of the railway wheel at which surface impregnation according to FIG. 4 has occured;
FIG. 6 is an enlarged section of a part of the railway wheel which in accordance with the method of the invention has been surface treated by surface application, whereby surface treating strings located beside each other have been integrated with each other;
FIG. 7 illustrates a section of a part of the railway wheel which in accordance with the method of the invention has been surface treated by surface impregnation, whereby surface treating strings located beside each other are integrated with each other;
FIG. 8 illustrates a section of a part of the railway wheel with a finished surface treatment provided in accordance with the present method, and
FIGS. 9,10,11,12,13 and 14 schematically illustrates parts of railway wheels on which surface treating strings are applied in accordance with the method of the invention in various patterns.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The railway wheel 1 illustrated in the drawings has a wheel tread 2 through which it is adapted to roll or run on a rail 3. The railway wheel 1 further includes a rail flange 4 which in a manner known per se ensures that the wheel can not move laterally relative to the rail 3 such that it ends up beside said rail. The railway wheel 1 also includes an arcuate transition portion 5 between the wheel tread 2 and rail flange 4. Central parts 5a of this transition part 5 have a smaller radius than the radii of outer parts 5b, 5c on opposite sides of said central parts 5a. When the railway wheel 1 rolls on the rail 3 during movement thereof on straight distances, in curves, on climbs, over switches and so on, it is the transition portion 5, the part 2a of the wheel tread 2 closest to said transition portion 5 and the part 4a of the rail flange 4 closest to said transition portion 5, i.e. those parts 2a, 5 and 4a located within the wheel sector S, which
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Excerpt from textbook entitled Mechanical Engineering Design, Joseph E. Shigley, McGraw Hill Publishing, 1989, pp. 71-74, No Month.
Translation of Previously Cited DE 3509582 CI Amendc et al. Feb. 1986.
Websters Ninth New Collegiate Dictionary, p. 1168 1990 (No Month).
Duroc AB
Padgett Marianne
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