Glosario de términos de formado de metales
A variety of functions may be performed by any Prensa, depending upon the tooling. Typical Prensa operations and other terms referring to Prensa features and functions are defined below:
Blanks are produced from the shearing or cutting of outside contours or shapes out of sheet or strip stock. For larger production runs, blanking is often done in multiple dies, and is combined with
other operations such as piercing and forming in combination and progressive dies.
Prensa Capacity -
Rated Prensa capacity is the tonnage Prensaure the slide can safely exert at the bottom of the stroke. Prensa Mecánica capacity is typically based on the bending capacityof the main shaft (crank, toggle, or eccentric shaft).
Prensa Clutch -
A coupling used to connect or disconnect a driving machine-member, such as a shaft or wheel, to or from a driven machine-member, such as another wheel or shaft. The engaging or disengaging can be done by a hand operated controlling device operated manually or automatically.
1. A tool used on a Prensa for any operation or series of operations, such as forming, drawing, piercing and cutting. The upper member (or members) are attached to the slide (or slides) of the Prensa, with the lower member clamped or bolted to the bed or bolster, shaped so that the material placed between them is cut or formed when the Prensa makes a stroke.
2. The female part of a complete die assembly as described in (1).
3. A tool for cutting external threads.
Die Cushion -
An attachment or Prensa accessory which gives additional motion or Prensaure required in many compound Prensa operations. The Prensaure medium can be rubber, springs, air or liquid (usually oil). Air (pneumatic) cushions are the most commonly used. Uses include blank holding, drawing, maintaining uniform Prensaure on a die part, knock-out, and stripping. Typically mounted in order on the Prensa bed, they can sometimes be mounted on the top of a Prensa slide flange.
Essentially a disk arranged to rotate around a center, not the center of dish but parallel to it. An eccentric should crank with a crankpin of such size that it contains or surrounds the shaft. The eccentric with its strap or connection is used in the eccentric Prensa and for driving auxiliary attachments, such as liftouts and various types of feeds.
A process in which Prensaure is applied to a slug of metal causing the metal to flow either up around the punch (toothpaste tubes) or down in the direction of Prensaure (cartridge cases - Hooker process).
A wheel used on an engine or machine with a rotation energy or inertia able to prevent excessive or sudden changes in speed. In modern Prensa Mecánicaes the flywheel is usually belted, chained or geared to the driving motor. A clutch is mounted on or within the flywheel.
A machine control process used to adjust and set dies and other tools in by precisely controlling the working members of the Prensa in short increments usually by rapidly engaging and disengaging the clutch or using electric or pneumatic push buttons.
A general term for cutting (shearing or punching) openings, such as holes and slots in sheet material, plate or parts. Similar to blanking; the slug or piece produced by piercing is scrap, whereas the blank produced by blanking is the useful part. In both cases the burr is opposite.
Progressive Dies -
A series of two or more dies arranged in line for performing two or more operations on a part, one operation (single or compound) performed in each die, at each station. Work in the form of a strip is usually fed to progressive dies automatically by a roll feed.
Tie Rod -
Four long rods, with threads and nuts on both ends, which hold the frame members of a Prensa de Lados Rectos together. These rods are stretched to place the frame members under comPrensaive load.
The most common name for the main reciprocating member of a Prensa, guided in the Prensa frame and to which the punch or upper die is fastened. It is also referred to as the ram. The inner slide of a Prensa de Doble Acción is called the plunger; the outer slide of a Prensa de Doble Acción is called the blank holder slide, and the slide of a Prensa Hidráulica is often called the platen.
Shut Height -
The shut height of an upright Prensa is the distance from the top of the bed to the bottom of the slide with stroke down and adjustment up. The shut height must always be defined either from the top of the bed or from the top of the bolster. The shut height of a horizontal or inverted Prensa, or of a Prensa with adjustable bed, can be defined in a similar manner. Generally the shut height is equal to the maximum die-height of the die that can be accommodated, taking the bolster into consideration.
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