Sprayed metal mold

Sprayed-metal mold n. A mold made by spraying molten metal onto a master form to obtain at shell of desired thickness, which may subsequently be backed with plaster, cement, casting resin, etc. Such molds are used most commonly in sheetforming processes. 

Mold construction FRP spray metal, cast aluminum gusket seal, air vents, self-sealing injection port FRP FRP, spray metal, cast aluminum, pinch (land) Metal, shear edge High grade steel shear edge... 

Consequently, their use is best confined to short run or prototype use. In normal production, the improved heat transfer capability of a metal mold will more than repay the greater cost. Aluminum is most commonly used for thermoforming molds other options include cast or sprayed low melting point alloys, porous sintered metals, and copper alloys (Chapter 17). 

Since the in-mold pressures in RIM are generally relatively low [50 to 150 psi (0.4 to 1.1 MPa)] a variety of tooling constructions have been used. These include machined steel or aluminum, cast aluminum or kirksite, sprayed metal or electroplated shells, and reinforced or aluminum filled epoxy (Chapter 17). With mold pressures usually below 100 psi (0.7 MPa), mold-clamp-pressure requirements can accordingly be low when compared to injection and compression molding. 

Molds can range from hardwood for short runs to filled and unfilled high temperature polyester (TS) and epoxy resins, cast solid urethane, sprayed metal, cast aluminum, cast porous aluminum, and machined steels. The... 

This refers to an open mold technique used for the production of many articles where the resin and reinforcement systems can be tailored to meet specific end use requirements. Typical products produced by this method are skis, boat hulls, tubs, and shower stalls. The molded cavity is sprayed with a gel coat to a desired thickness to produce a desired surface finish or color. The reinforcement, which is usually glass fibers, mats, or sheets, is then hand rolled to secure proper wetting of the fibers as well as the required wall thickness. The final curing takes place through the use of a catalyst or hardener reaction. Matched metal molds are often used with hand lay-up formulations in order to achieve high quality surface finishes on both sides of the molded article. 

Mold construction FRPt spray metal, cast FRP FRP, spray metal Metal, shear edge High grade steel ... 

Electroformed mold n. A mold made by electroplating a model, which is subsequently removed from the metal deposit. The deposit is sometimes reinforced with cast or sprayed metal backings to increase its strength and rigidity. Such molds are used in slush casting of vinyl plastisols and other forming processes done at low pressures. 

ASTM 281 138 Locator members in tools and fixtures, electroforming cores, dies for lost-wax patterns, plastic casting molds, prosthetic development work, encapsulating avionic components, spray metalizing, and pantograph tracer molds... 

Diffuse or scattering samples can have many appearances or compositions. Materials such as ceramic tiles, packed powdered metal salts or polymers, painted chips, simple molded plastics, or more esoteric materials such as plasma-sprayed metals or sintered porous polymers, are all successfully used as standards for diffuse reflectance. 

Also, glass, thermoplastics, composites and ceramics (metal molds sprayed with a refractory material) can be molded by this method. 

The actuator contains the final orifice and a finger pad or mechanical linkage for on—off control. The spray pattern is largely affected by the constmction of the actuator, particularly by the chamber preceding the orifice. Actuators are often termed mechanical breakup and nonmechanical breakup depending upon the complexity of this chamber. Mechanical breakup actuators are of more expensive two-piece constmction. Actuators are usually molded from polyethylene or polypropylene the breakup insert may be almost any material, including metal. 

Forced air, water mist, or water spray cool the mold after it leaves the oven. Once the mold [. cools sufficiently for the polymer inside to solidify, it is opened. The cooling time must take. into account the resin, the wall thicknesses, and the metal from which the mold is fabricated, ff.. Very rapid cooling of the mold can introduce stresses that can weaken or distort the final part. 

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