TITLE
ENHANCED MANUFACTURING METHOD FOR BRAKE SHOE WEBS
FIELD OF THE INVENTION
This invention generally relates to a brake mechanism for an automotive vehicle in a drum brake. In particular this invention claims a novel, cost-effective manufactunng method for brake shoe webs.
BACKGROUND OF THE INVENTION
Brake shoe assembly is found In the wheel drum of any automobile. The brake shoe assembly is made up of individual components that include shoe web, hm and brake lining. The individual component shoe web is vital to augment rib strength and to transmit force from CAM assembly to hold the brake.
Drum brake shoe webs have been produced commercially for many years. The brake shoe webs are manufactured by a conventional method called "Blanking Operation" by employing various devices like press tool for blanking , Mechanical press machine, etc. In this conventional process of manufacturing webs, sheared or cut to size hot rolled steel plates are fed one by one in to the Press tool which is bolted to the machine bed. The individual plates so fed into the press tool of the

machine are blanked down into several individual brake shoe webs. The die penetrates In to the punch through metal strip and cold cutting takes place thereby required shape of the component is achieved.
Some of the prior art in this field reveal diverse techniques deals with various kinds of brake shoe assemblies.
Indian Patent Application No; 1375/DEL/1999 describes a brake shoe assembly for a vehicle comprising: a brake lining having a predetermined thickness which gradually wears away and increases In temperature during a vehicle braking application; a housing positioned to wear away and Increase in temperature concurrently with said brake lining; and a thermally sensitive switching element encapsulated in said housing for directing power from a power source to a remote indicator in response to the temperature of said housing exceeding a predetermined temperature threshold.
Indian Patent Application No: 2926/DEL/199 discloses a composition brake shoe for use on a railway freight vehicle for reconditioning a wheel tread surface of such railway freight vehicle during a normal braking application on such vehicle, said composition brake shoe comprising: (a) a brake surface having a predetermined configuration and a predetermined surface area; (b) a first friction type composition material having a predetermined shape and at least initially extending entirely over

said predetermined surface area of said brake surface of said composition brake shoe; and (c) a second fhction type composition material formed as a discrete insert, having a predetermined shape, and molded into said first friction type composition material.
Indian Patent Application No: 1254/MAS/1997 claims a brake shoe for an internal shoe drum has an arcuate platform (2a, 3a) carrying a lining of friction material (2b, 3b) on its outer face. A web (2c, 3c) extends perpendicularly from the inner face of the platform and provides a shoe tip intended to be supported on an angled surface (7a, 7b) of the brake abutment (7). This shoe tip has a pair of differently directed surface portions (T1, T2).
None of the existing prior art discloses any manufacturing method of brake shoe webs or claims the brake shoe web itself.
As an example, in the conventional method of manufacturing shoe webs, raw material input for 100 webs of 8 mm thickness is around 100 kg and the output produced is around 57 kg. Therefore almost 44% of the input material forms the scrap which is nothing but waste material. Hence in such conventional method of manufacturing shoe web the percentage of input raw material wasted as scrap is large and poses a great loss to the manufacturer.

Few proposals have been made in the past to bui!d a new technology to manufacture brake shoe webs with minimum wastage of raw material and without producing enormous amount of scrap as waste. The above mentioned conventional method called Blanking Operation is being used by the present automobile and spare parts industries engaged in the manufacture of shoe webs. The concern of all these industries lies in the substantial percentage of waste that is obtained while manufacturing shoe webs in this conventional style. Therefore is it the need of the hour in the industry to develop a cost effective manufacturing method for brake shoe webs.
The present invention attains this objective and addresses the major problem of wastage of raw material. The present invention involves a novel manufacturing method whereby, the conventional blanking operation and using higher tonnage mechanical press method of manufacturing brake shoe webs are eschewed in favour of a special process called Radial formation which includes several concise steps and the employment of a lower tonnage hydraulic or Mechanical press to arrive at the final finished product. The Radial formation process that forms the part of the present invention ensures that maximum percentage of input raw material is converted into product output. As an example, In the present novel manufacturing method, raw material input for 100 webs of 8 mm thickness Is around 100 kg and the out put is 83 kg . Therefore only 17% of the input material forms the scrap.

Hence the present invention for manufacturing braise shoe webs is a cost effective method where the percentage of waste is very minimal.
Further it will be apparent to those skilled in the art that the objects of this invention have been achieved by providing a suitable manufacturing method which is unique in nature unlike existing manufacturing methods that are no longer cost effective. Various changes may be made in and without departing from the concept of the invention. Additional features of the invention will be described hereinafter that form the subject of the claims of the invention. Those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiment as a basis for designing and modifying other methods and structures for carrying out the same purpose of the present invention. Further, features of some stages disclosed in this application may be employed with features of other stages. Therefore, the scope of the invention is to be determined by the terminology of the following claims and the legal equivalents thereof,
OBJECTIVES OF THE INVENTION:
This invention may be summarized, at least in part, with reference to its objects.

The foremost object of the present invention is to present a novel cost effective manufacturing method for brake shoe webs that can improve the input or output ratio.
Another object of the present invention is to replace the conventional method of manufacture using higher tonnage mechanical press by a comparatively lower tonnage hydraulic press.
Another object of the present invention is to avoid frequent tool breakage.
Another object of the present invention is to provide an easily maintainable manufacturing machinery.
Another object of the present invention is to facilitate easy handling of the raw material.
Yet another object of the present invention is maximum utility of the raw material and save input.
A further object of the present invention is to reduce the noise that is common during the conventional manufacturing process.

Additional objects, advantages and novel features of the invention will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following, or may be learned by practice of the invention.
SUMMARY OF THE INVENTION
The present invention embodies a novel cost effective manufacturing method for brake shoe webs improves the input / output ratio, reduces the total cost of manufacturing said brake shoe webs, and thereby the investment into the manufacturing process.
Individual strips are fed into a hydraulic press and radially formed into the desired shoe web shape due to the descending force of the press. The shoe web is cropped and hole punched with a mechanical press leading to the formation of the final product..
The above process uses easily maintainable manufacturing machinery that helps to avoid frequent tool breakage and reduce the noise that is common during the conventional manufacturing process.

DESCRIPTION OF THE DRAWINGS
The advantages and features of the present invention will be more readily apparent by persons s[