Deep Draw Stamping and CNC Machining
The production of deep-drawn parts requires mechanical and hydraulic presses with ratings from 2 to 200 tons, draw capability to 6" and bed size capacity of 5 ft x 5 ft.
To produce precision parts, a shop should include CNC machining centers with bar feeds, multiple-spindle screw machines (capacity to 2"), chuckers (up to 8" capacity) and speed lathes.
For secondary operations and assemblies the company should offer in-house drilling, tapping, spot welding and machining along with tool and die capability. A2 and D2 tool steels and carbide inserts are used in the dies. To complete customer requirements it is recommended that approved sources for painting, polishing and plating be offered by the stamping vendors should they provide these services in-house.
Cold-rolled steel alloys, stainless steel, aluminum and alloys such as Kovar and OFHC copper are among the materials used in these operations in gauges from 0.005" to 0.250".
Deep-drawn parts have application in lasers, capacitors and resistors. The range covers everything from candy machines to space shuttles. The draw process is more economical in medium to long production runs.
To maintain quality throughout this variety of operations, methods such as Statistical Process Control (SPC) must prevail. If the products being made are for government applications, compliance with specifications such as MIL-I-45208A is essential.
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