摘要:
To provide the manufacturing method for the friction material products which does not require the special molding die and realizes the significant simplification of the molding step while maintaining the quality of the friction material. The manufacturing method for the friction material products comprising the molding step of pressurizing and heating to mold the molding material made of the raw friction material within the molding die, wherein the molding temperature in the molding step is 190° C.-230° C. and the pressure thereof is 100 MPa-200 MPa.
摘要:
A restraint fixture (12) is disclosed that includes a preform retention region configured to limit contracting forces applied against a preform (10) in the preform retention region when the restraint fixture (12) thermally contracts. In one embodiment, the restraint fixture (12) comprises a band (12) having a first surface defining the preform retention region and a first expansion portion (26, 28, 29) adapted to deform upon application of a force to the band (12).
摘要:
The present invention makes use of loose fibrous material (for instance, chopped fibers) as reinforcement matrix material in the manufacture of carbon-carbon composites. In accordance with this invention, a constraint fixture is provided which can be separated from the mold. The constraint fixture has an internal shape corresponding to the shape of a desired preform component, with the internal shape being defined by a bottom plate (2), an annular ejector plate (3, 3′), a inner wall (10), an outer wall (4), and an annular top plate (11, 11′). The constraint fixture is normally made of metal, porous ceramic, or carbon material. The constraint fixture of the mold holds the loose matrix materials (fibers, along with any fillers and/or additives). The mold assembly itself is segmented, so that the constraint, fixture and the loose fill materials in the fixture can be removed and subjected to further processing as a unit. Such further processing may include Chemical Vapor Deposition or resin or pitch infiltration or Resin Transfer Molding. The preform matrix may remain in the constraint fixture through such processing steps as densification and until it is removed therefrom for final machining.
摘要:
Molding apparatus for rapid transfer of molten resin or pitch in an infiltration molding process. The apparatus includes e.g. an extruder (4) for melting and conveying a resin or pitch and a mold (10) arranged so that resin or pitch is conveyed to a mold insert cavity (19) within the mold. The mold insert contains an internal protrusion such as an outside diameter ring (20) for effecting a pressure gradient and flow of the resin or pitch from one side (ID) of the mold insert cavity toward an opposite side (OD) of the mold insert cavity. The mold insert also contains an internal protrusion such as a locating ring (25) for positioning a porous body (1, 18) within the mold insert cavity in a position that brings about unidirectional flow of the molten resin or pitch through the porous body. Also, a rapid resin or pitch infiltration molding process that includes injecting a high melting point, high viscosity, molten resin or pitch into the mold to effect a unidirectional impregnation of a heated preform via a pressure gradient in the mold.
摘要:
The invention relates to a method for producing ceramic brake discs, comprising the following steps: a) producing a BMC compound (2) with a matrix consisting of phenol resin and with carbon reinforcement fibres, the length of the carbon fibres being between 6 mm and 50 mm; b) poducing a green compact of the ceramic brake discs from the BMC compound (2) in a transfer moulding or injection compression moulding process, c) pyrolysing the green compact in order to produce a porous moulded body, and d) melt-infiltrating the porous moulded body with a melt preferably a silicon melt, in order to produce a moulded body with reaction-bonded fibres.
摘要:
A device (100) for the thermal treatment of friction lining surfaces (19) (scorching) is characterized in that at least one infrared light source is placed in the heating station (10) for heating the friction lining surfaces. Short-wave infrared light of approximately 780 to 1400 nm with a maximum at 1200 nm is preferably used. A suction bell (11) and a fan (12) for removing the decomposition gas are above the heating station (10). The irradiation can take place in depression or in special chemical atmospheres. An infrared thermometer (20) supervises the temperature of the friction lining surfaces (19) and eventually causes an elimination (14) of parts. A cooling station (17) is following the heating station (10).
摘要:
Methods for forming a lined brake shoe having a curved brake lining attached to a table of the lined brake shoe. The curved brake lining is manufactured by molding a flat sheet of brake lining material in a partially polymerized state. This flat sheet is allowed to cool prior to be positioned within a press having warmed dies. The warm dies of the press form the curved brake lining while holding the curved brake lining in its desired shape. The warm dies restart the polymerization process. When further polymerization has been completed the curved lining is removed from the press. One embodiment places the table of the lined brake shoe in the press. Then, by adding a bonding material, the completed lined brake shoe can be manufactured while the polymerization process continues in the press.
摘要:
To provide a friction component of a multilayer structure in which each layer can be formed so as to have a specified thickness, as well as its manufacturing apparatus and method. A side plate 3 having a void 3a of a specified depth formed therein is provided between a plunger 2 and a fixed mold 5 so as to move in the horizontal direction. A hopper 6 for adhesive-layer materials is provided near a molding box 1. An output port 6a in the hopper is located so as to contact slide plate 3. When the side plate 3 is moved in the lateral direction in the figure so that the void 3a is located under the hopper 6, the lower end surface 6b of the hopper acts as a leveling plate to feed an adhesive-layer material 8 into the void. The adhesive-layer material is moved to the lower part of the molding box 1, a specified amount of friction material 9 is fed in such a way that its thickness becomes uniform, and the plunger is then used to pressurize and mold the materials. By placing a plurality of slide plates one on another, a multilayer structure having three or more layers can be obtained.
摘要:
The invention relates to the field of needling processes for forming fibrous preform structures. The invention is particularly useful in forming fibrous preform structures suitable for subsequent processing into high temperature resistant composite structures such as carbon/carbon aircraft brake disks. The process according to the invention compensates for fiber pull back induced by fiber resilience, and for compaction in previously needled layers induced during subsequent needling passes. According to a further aspect of the invention, Z-fiber distribution throughout the thickness of the fibrous preform structure may be manipulated as necessary to achieve a desired distribution.
摘要:
A continuous process for the manufacture of friction units includes the steps of impregnating a plurality of strands of reinforcing fibers with a phenolic resin having zero to ten percent copper and graphite powders, pulling the impregnated strands of reinforcing fibers through a composite forming die for forming a body having the peripheral configuration of the friction units, and selectively cutting the body into a plurality of the friction units.