汽车模具开发过程中所涉及的所有英文术语及其英文解释
Draw die – A die in which sheet metal is radially compressed on the binder and stretched as it is pulled off the binder and into the die cavity by the punch. Most automotive draw die stampings will have radial compression primarily in the corners of the stamping. Draw stampings for parts such as cups and cans will have radial compression around the entire punchline.
Open-end draw die – A die process similar to a draw die, but with little or no compression of the sheet metal due to the absence of closed corners at the ends of the stamping. A rough blank is used and a subsequent trim die operation is necessary, similar to that required for the draw die process. This is a recommended process for higher strength steel structural members such as rails and crossbars.
Draw-action form die – A form die in which an external pressure pad (similar to a binder) is used to control compression and buckles on flanges during the deformation process. This type of die normally utilizes a developed blank which eliminates the need for a following trim die operation. This is a recommended process for “hat section” parts with compression flanges.
Air draw – A draw operation performed in a single-action press with blankholder force supplied by air or nitrogen pressure cushion.
Draw development – The process of developing a die-setup for the workpiece, including the flange trim angles, addendum sheet metal and binder surfaces in order to design a draw die and subsequent trim die operation.
Blank – A precut sheet metal shape ready for subsequent press operation. Developed blanks are produced in blank cutting dies. Rough blanks are produced in shear lines or cutoff dies.
Developed blank - A flat sheet steel blank with a profile that can be used to produce a finished part with a minimum of trimming operations. This type of blank is used primarily in form dies.
Rough blank – A flat sheet steel blank with a rectangular, trapezoidal or chevron periphery. These blanks are used for draw die or stretch-form die applications.
Binder – The upper and lower holding surfaces that control sheet metal flow into the draw die cavity.
Blankholder – That part of the draw die binder which has pressure adjustment.
Programmable blankholder – A blankholder actuated by a press or die cushion that can be programmed to vary the pressure profile during the draw die process. HSS stampings can benefit from increased cushion pressure at the bottom of the press stroke.
Pulsed blankholder – A programmable blankholder that cycles the amplitude and frequency of the pressure profile to allow the sheet metal to alternately slip and stretch.
Flexible blankholder – A blankholder designed to apply specific pressures to target areas of the binder surface. Controllable pressure sources are required under each target area. The blankhold-er must be designed to allow minor flexing.
Active draw beads – Draw beads that can be actuated near the bottom of the press stroke to increase restraint of the sheet metal flow off the binder. This is intended to provided “shape set” for HSS stampings. |
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发表于 2009-5-12 23:21:41
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