Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Stratified or layered articles
Patent
1998-04-28
2000-05-09
Ortiz, Angela
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Stratified or layered articles
264120, 264162, 264319, 425112, 425121, 425353, 425407, D04H 120
Patent
active
06060008&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a process for the manufacture of friction linings, for example disc brake linings for lorries, drum brake linings for passenger vehicles and lorries, clutch linings, industrial linings and railway linings.
BACKGROUND OF THE INVENTION
In a known process for making such linings, after the friction composition mixture has been mixed, the friction linings are manufactured in separate individual steps with interruptions being provided in the manufacturing process for storage times. The friction composition material is mixed from the raw materials in one or more stages. The friction composition mixture is given the intended shape in a compression mold or by another suitable method. The compressed friction linings are cured in a curing oven. The friction linings are finished by grinding, drilling and the like. After-treatment of the surface of the manufactured friction linings by means of heat is also possible. Such after-treatment may then be followed by lacquering, quality control, packaging, etc.
In the known processes, the succession of individual process steps, which are separate from one another in time, results in a relatively long processing time for the friction linings. The heating processes that are required lead to a high energy outlay, especially since the friction linings are cooled to room temperature again after each individual process step. In addition, transportation of the friction linings involves a not inconsiderable outlay in terms of work.
OBJECT OF THE INVENTION
It is an object of the invention to provide a process for the manufacture of friction linings that runs continuously as a process line without any interruption in the flow of material, so that the processing time is considerably shortened.
SUMMARY OF THE INVENTION
This object is attained according to the invention in a process for the manufacture of friction linings in which a friction composition is prepared in the form of a granular material in a mixing reactor, the granular material is compressed in a compression molds for up to 120 seconds with a support composition and lining supports to form friction linings and, immediately after leaving the compression molds, the finished compressed friction linings is cured for a given period of time in a continous oven, without being restrained, the friction linings being transported between the compression molds and the continuous travel oven on a continuous conveyor means. According to the invention, a continuous manufacturing line is produced using known and specially designed devices and apparatuses, the hitherto customary processing time of a friction lining being considerably shortened as a result.
In addition, because the friction linings are exposed during their manufacture to precisely defined process parameters for precisely defined periods of time, the spread of the manufacturing tolerances becomes considerably narrower. The principal difference as compared with the conventional process known from the prior art for manufacturing friction linings is that, according to the invention, the friction linings are manufactured in a process that can be regulated and that proceeds in a controlled manner from beginning to end. By adjusting the given process parameters at each process step, for example at mixing, metering, compression, the obtainable and given qualitative process product can be planned within narrow tolerances. Because the process proceeds in a closed and continuous manner, it is possible to ensure higher quality and uniformity of the manufactured friction linings. In contrast to the conventional processes for the manufacture of friction linings, it is no longer possible that a deviation from the given quality of the friction linings will be detected only after expensive tests have been carried out.
When introducing the friction composition into the mixing reactor it is unimportant in the case of the process according to the invention whether the friction composition is introduced into the mixing reactor in the form
REFERENCES:
patent: 4191726 (1980-03-01), Stillhard et al.
patent: 4563386 (1986-01-01), Schwartz
patent: 4777003 (1988-10-01), Baiborodov et al.
patent: 4900240 (1990-02-01), Leinweber
patent: 4923661 (1990-05-01), Russo
patent: 4968468 (1990-11-01), Leinweber
patent: 5030075 (1991-07-01), Leinweber
patent: 5132065 (1992-07-01), Christie
patent: 5641444 (1997-06-01), Fujikawa et al.
patent: 5895616 (1999-04-01), Yumoto et al.
Czarnowski Klaus-Peter
Gornik Fred
Dubno Herbert
Frimatec Ingenieurgesellschaft mbH
Ortiz Angela
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