OEM/ODM Factory for Brass Turning Parts 01 for Buenos Aires Manufacturers

OEM/ODM Factory for
 Brass Turning Parts 01  for Buenos Aires Manufacturers

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    Hueibin Enterprise Corp. E-mail:kevin@hueibin.com


    Progressive metal stamping is a metalworking method that can encompass punching, coining, bending and several other ways of modifying the metal raw material, combined with an automatic feeding system.
    The feeding system pushes a strip of metal (as it unrolls from a coil) through all of the stations of a progressive metal stamping mold. Each station performs one or more operations until a finished part is made. The final station is a cutoff operation, which separates the finished part from the carrying web. The carrying web, along with metal that is punched away in previous operations, is treated as scrap metal. Both are cut away, knocked down (or out of the molds) and then ejected from the mold set, and in mass production are often transferred to scrap bins via underground scrap material conveyor belts.
    The progressive metal stamping mold is placed into a reciprocating metal stamping press. As the press moves up, the top mold moves with it, which allows the material to feed. When the press moves down, the mold closes and performs the metal stamping operation. With each stroke of the press, a completed part is removed from the mold.

    Since additional work is done at each “station” of the mold, it is important that the strip is advanced very precisely so that it aligns within a few thousandths of an inch as it moves from station to station. Bullet shaped or conical “pilots” enter previously pierced round holes in the strip to assure this alignment since the feeding mechanism usually cannot provide the necessary precision in feed length.

    Progressive metal stamping can also be produced on transfer presses. These are presses that transfer the components from one station to the next with the use of mechanical “fingers”. For mass production of stamped parts which do require complicated in press operations, it is always advisable to use a progressive press. One of the advantages of this type of press is the production cycle time. Depending upon the part, productions can easily run well over 800 parts/minute. One of the disadvantages of this type of press is that it is not suitable for high precision deep drawing which is when the depth of the metal stamping exceeds the diameter of the part. When necessary, this process is performed upon a transfer press, which runs at slower speeds and relies on the mechanical fingers to hold the component in place during the entire forming cycle. In the case of the progressive press, only part of the forming cycle can be guided by spring-loaded sleeves or similar, which result in concentricity and morality issues and non-uniform material thickness. Other disadvantages of progressive presses compared to transfer presses are: increased raw material input required to transfer parts, tools are much more expensive because they are made in blocks with very little independent regulation per station; impossibility to perform processes in the press that require the part leave the strip (example beading, necking, flange curling, thread rolling, rotary metal stamping etc.).
    The molds are usually made of tool steel to withstand the high shock loading involved, retain the necessary sharp cutting edge, and resist the abrasive forces involved.

    The cost is determined by the number of features, which determine what tooling will need to be used. It is advised to keep the features as simple as possible to keep the cost of tooling to a minimum. Features that are close together produce a problem because it may not provide enough clearance for the punch, which could result in another station. It can also be problematic to have narrow cuts and protrusions.

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