US 3447588 A
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United States Patent US. Cl. 16473 2 Claims ABSTRACT OF THE DISCLOSURE A method of preparing a mold in a continuous casting plant that includes cleaning the mold of oxides and greases, then spraying the surfaces of the mold with a coating or dressing including a polymer base and molybdenum disulphide. The coating acts as a lubricant and may be applied a second, or other times, after completing several ingots.
The present invention relates to methods of running in the working Walls of a mold.
Methods are known of running in the working walls of a mold in the process of continuous casting of metal, in which the working walls of the mold are first covered by a coating in the form of suspension and then dried (see the book, entitled, A Continuous Casting, written by Hermann, Moscow, published in 1961, p. 451).
Disadvantages of the existing methods consist in that the period of time required for running in the working walls of a mold is rather long. The presence of roughnesses on the working walls that are not yet run in requires a great force to extract the ingot from the mold. This detrimentally affects the quality of the ingot being cast and also these methods are difficult to carry into effect.
An object of the present invention is to develop a method of running in the working walls of a mold which accelerates the running-in process.
An important object of the present invention is to develop a method of running in the working walls of a mold, which is simple to realize.
A further object of the present invention is to develop a method of running in the working walls of the mold which improves the quality of the ingot being cast.
These and other objects are achieved due to the fact that the method of running in the working walls of the mold includes the preliminary application of a coating thereon. The coating, according to the present invention, is a lubricant based on polymers with the additions of molybdenum disulphide.
Said lubricant may be applied upon the mould Working walls repeatedly after completing a number of casts.
The nature of the present invention will become more fully apparent from a consideration of the following description of an exemplary embodiment thereof.
The method of running in the working walls of the mold consists in preparing new or repaired working walls 3,447,588 Patented June 3, 1969 of the mold by thoroughly cleaning them from oxides and degreasing them by acetone or ethyl alcohol. The surfaces of the working walls of the mold thus prepared are covered, by the aid of a spray or by any other existing method, with a thin even coating of a lubricant in the form of polymers with additions of molybdenum disulphide.
In said lubricant, the polymer base is composed of an epoxy resin.
This lubricant is prepared in the following manner.
First, one must take about to 150 parts by Weight of the epoxy resin and heat it. Into the heated resin about 15 to 30 parts by weight of dibutyl phthalate are added, and the mixture is mixed. Then, about 50 to parts by weight of molybdenum disulphide are introduced therein, and about 15 to 30 parts by Weight of polyethylenepolyamine are added thereto. The mixture thus obtained is then dissolved in a nitric solvent until it is brought to a state where it is suitable to be applied upon the working walls of the mold by a spray device or by any other existing method.
After the application of the lubricant, the working Walls of the mold are dried for a period not less than one day.
After completing 2 to 3 casts, the surfaces of the working walls of the mold are washed by kerosene, dried, and the lubricant is applied thereon for the second time.
Under the effect of pressure and the high temperature of metal during its casting molybdenum disulphide, which partially diffuses into the working walls and remains on their surfaces, forms a surface layer which decreases the friction and prevents the adherence of the solidifying metal.
When the lubricant is applied for the second time, it can be employed without the use of epoxy resin, additions of dibutyl phthalate and polyethylene-polyamine.
The method of running in the working faces of the mold described above is capable of speeding up the running-in process, is simple to be realized, and decreases the forces required for extracting the ingot from the mold by as much as 1.5 times.
What is claimed is:
1. A method of running in the working walls of a mold in the process of continuous casting of metal by first applying thereon a lubricant on the basis of a polymer with additions of molybdenum disulphide.
2. A method according to claim 1, wherein the lubricant is applied for the second time on the Working walls of said mold after completing a number of casts.
References Cited UNITED STATES PATENTS 2,050,375 8/1936 Poland 16472 2,772,459 12/1956 Wieland 164-138 X 3,163,896 1/ 1965 Rochester et a1 16473 1. SPENCER OVERHOLSER, Primary Examiner.
V. RISING, Assistant Examiner.
US. Cl. X.R.