Apparatus and method for rail head improvement

Abstract

A railroad rail comprising a rail head, wherein the rail head is made from a first material and defines a void, and an insert comprising a second material installed in the void.

Claims

1. A method for installing an insert in a rail head comprising: wrapping the insert in-whole or in-part with a brazing material; inserting the wrapped insert into a void in the rail head, and heating the wrapped insert and surrounding rail head to braze the insert to the rail head.

2. The method of claim 1 further comprising feeding brazing material into the joints between the insert and the void during heating to compensate for brazing material flowing out of the void during heating.

3. The method of claim 1 wherein the brazing material comprises BAg-7.

4. The method of claim 1 wherein the heating is performed at 1,200 F.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) For the present disclosure to be easily understood and readily practiced, the present disclosure will now be described for purposes of illustration and not limitation in connection with the following figures, wherein:

(2) FIG. 1 shows rail end batter damage in conventional rail heads;

(3) FIG. 2 shows plastic flow damage in conventional rail heads;

(4) FIG. 3 is an exploded top perspective view of a rail head defining a void or cut-out section that receives an insert in accordance with the present disclosure;

(5) FIG. 4 is a top perspective view of a rail head having an insert disposed within a void or cut-out section in accordance with the present disclosure;

(6) FIG. 5 is a top perspective view of a rail joint comprising rail heads having an insert disposed within a void or cut-out section in accordance with the present disclosure;

(7) FIG. 6 is a top perspective view of a rail head defining a void or cut-out section for receiving an insert in accordance with the present disclosure;

(8) FIG. 7 is a top perspective view of an insert for installation in a rail head defining a void or cut-out section in accordance with the present disclosure;

(9) FIG. 8 is a left side view of an insert for installation in a rail head defining a void or cut-out section in accordance with the present disclosure; and

(10) FIG. 9 is a bottom perspective view of an insert for installation in a rail head defining a void or cut-out section in accordance with the present disclosure.

DETAILED DESCRIPTION

(11) In the following detailed description, reference is made to the accompanying examples and figures that form a part hereof, and in which is shown by way of illustration specific embodiments in which the inventive subject matter may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice them, and it is to be understood that other embodiments may be utilized and that structural, logical, and electrical changes may be made without departing from the scope of the inventive subject matter. Such embodiments of the inventive subject matter may be referred to, individually and/or collectively, herein by the term disclosure merely for convenience and without intending to voluntarily limit the scope of this application to any single disclosure or inventive concept if more than one is in fact disclosed.

(12) The following description is, therefore, not to be taken in a limited sense, and the scope of this disclosure is defined by the appended claims.

(13) Insulated rail joints are commonly used for signaling control and broken rail detection in signaled track. The rails used in rail joints are made of regular rails, compliant with railroad standards. The rails are drilled, cut and assembled per railroad industry standards and standards proprietary to the insulated rail joint suppliers. The design options for a rail joint can include various bar designs, assembly process, unique parts used in the joint assembly or unique cutting geometries. While there may be many design options for an insulated rail joint and its parts, these design options do not generally include major alterations to the rails used in the joint other than fabricating the rails in a specific shape or form.

(14) Historically, the only alteration that has been made to virgin rails used in a joint application is rail end hardening, which is a heat treatment process to harden the ends of the rails for improved performance in the field. This method doesn't involve any replacement of rail material with another material. The method was embraced in the past, however the industry and suppliers gradually moved away from it mainly due to improvements in premium rail qualities supplied by the rail mills.

(15) Rail end damage within insulated rail joints is widely known (see FIGS. 1 and 2). While the performance of rail joints in their operational environment has increased as a result of improved designs and track maintenance, rail end damage still remains one of the key initiators of failure in rail joints (ref: RT&S magazine, August 2016 edition, incorporated herein by reference).

(16) The apparatus and method of the present disclosure comprises a rail head end 22 of rail head 20 defining a void 24 (FIGS. 3 and 6) having a particular geometry and an insert or tip 26 (FIGS. 3, 4 and 7) made of an improved material installed in the void 24 (see FIG. 3 and FIG. 4).

(17) A preferred embodiment of the present disclosure shows a particular shape for void 24, which may be customized as required, and a complementary shape for insert 26 to be inserted in the void 24. Preferably, insert 26 is fixed in void 24 by one or more of friction-fitting, force-fitting, slide-fitting, adhesive bonding and/or brazing.

(18) Void 24 and insert 26 define geometric locking features such as tongue 27 disposed around one or more of the three sides of insert 26 that are inserted into void 24. Tongues 27 are received in grooves 25 that form part of void 24. Such locking features may be shaped as necessary to assist in enabling insert 26 to remain in its place within void 24 in the event of a bond failure between insert 26 and rail head 20.

(19) Insert 26 is preferably made from heat treated tool steel, such as A9 tool steel, possessing superior properties compared to rail steel.

(20) In a preferred method of the present disclosure for installing insert 26 in void 24, insert 26 is wrapped with BAg-7 brazing foil and inserted into void 24. The assembly is heated up to 1,200 F., preferably using torch heaters. In addition, a feeder tube of BAg-7 brazing material is held above the vertical cut lines of the brazed joint between insert 26 and void 24 to back fill BAg-7 brazing material as some of the BAg-7 brazing material from the wrapping will inevitably flow out of the joint during the brazing process. After the joint is fully brazed, the heat is removed and the brazed joint comprising insert 26 in void 24 preferably cools down in the ambient plant environment. Following the cool down, excess brazed material is cleaned away to bring rail head end 22 back to its original and acceptable shape.

(21) Preferably, rails with modified rail heads according to the present disclosure having the insert 26 brazed in void 24 construction are assembled with bars and other design elements in the discontinuous portion 30 (generally the middle of the rail joint) of a standard rail joint assembly as shown in FIG. 5.

(22) It will be readily understood to those skilled in the art that various other changes in the details, components, material, and arrangements of the parts and methods which have been described and illustrated in order to explain the nature of this disclosure may be made without departing from the principles and scope of the disclosure as expressed in the subjoined claims.

(23) In the foregoing description of preferred embodiments of the present disclosure, various features are grouped together in a single embodiment to streamline the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the disclosure require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby incorporated into the foregoing description, with each claim standing on its own as a separate embodiment.