Claims
- 1. A method of bonding brake linings to a metallic brake shoe which comprises:
- (a) subjecting the inner side of the brake linings to intense preheat in a range of 500.degree. to 700.degree. F. for a period of 45 to 75 seconds to remove moisture and trapped gases in a thin layer at the heated surface,
- (b) cooling the linings to about ambient temperature,
- (c) spraying a heat-setting bonding material on the inner side of said linings,
- (d) applying said inner side of a said linings to a metallic brake table surface under pressure to pre-stick the linings in place,
- (e) applying a high pressure to said linings relative to said table surface in the range of 2000 pounds per square inch, and
- (f) heating said linings and brake tables to a temperature in the neighborhood of 650.degree. F. for about 45 minutes to set the heat-setting bonding material.
- 2. A method of bonding brake linings to a metallic brake shoe as defined in claim 1 in which:
- (a) the brake table surface is heated and cleaned prior to the pre-stick step.
- 3. A method of bonding brake linings to a metallic brake shoe as defined in claim 1 in which:
- (a) the preheat is accomplished by passing the linings through an infrared oven with the inner side of the linings exposed.
- 4. In a method of bonding brake linings to a metallic brake shoe in which the linings are bonded to the shoe by a heat-setting bonding material under conditions of pressure and heat, that improvement which comprises:
- (a) preheating the surface of the inner side of the linings, to a temperature of about 300.degree. to 800.degree. F., by subjecting the linings to infrared burners for a period ranging from 1/2 minute to 12 minutes,
- (b) cooling the linings to ambient temperatures, and
- (c) spraying the inner side of the linings with a heat-setting bonding material prior to the application of the final pressure and heat stage.
- 5. In a method of bonding brake linings to a metallic brake shoe in which the linings are bonded to the shoe by a heat-setting bonding material under conditions of pressure and heat, that improvement which comprises:
- (a) passing the linings through an infrared oven with the inner side of the lining exposed,
- (b) preheating the surface of the inner side of the linings to a temperature of about 300.degree. F. to 800.degree. F. by subjecting the inner sides to infrared heat for a period of 1/2 minute to 12 minutes,
- (c) cooling the linings to ambient temperatures, and
- (d) spraying the inner side of the linings with a heat-setting bonding material prior to the application of the final pressure and heat stage.
Parent Case Info
This application is a continuation-in-part of my co-pending application entitled "Process for Bonding Brake Linings," Ser. No. 662,725, filed Mar. 1, 1976 now abandoned.
US Referenced Citations (4)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
662725 |
Mar 1976 |
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