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30 Cards in this Set
- Front
- Back
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When selecting a press, be prepared to discuss what?
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1. Machine Size
2. Force 3. Energy 4. Speed 5. Parts size and geometry 6. Number of Workpieces 7. Production Rate 8. Accuracy & Finish 9. Equipment Costs |
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What are the two basic frame designs of mechanical presses?
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1. Gap-frame
2. Straight Sided |
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How many tons does a Gap-frame press rate?
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1 - 300 tons
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How many tons does a Straight-side press rate?
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Over 2000
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Is the Gap-press or the Straight-side press more succeptable to frame deflection?
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Gap
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What configurations are the gap-frame presses available in?
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1. Open Back Inclineable (OBI)
2. Adjustable Bed Stationary (ABS) 3. Open Back Stationary (OBS) 4. Bench Press |
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What does "single point", "two point", or "four point" press mean?
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Each slide is connected or suspended at one or more points where the power is applied to the slide.
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What makes a press "Double Acting"?
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It has two independent slides, one inside of the other.
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Where is a "die cushion" normally located on a press?
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In the bed, beneath the lower die and bolster plate.
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What does a die set consist of?
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1. Upper Die
2. Lower Die 3. Guide Pins |
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What actually controls teh size of the hole in a punching operation?
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The punch
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What controls the soze of the bland in a punching operation?
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The Die
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What two categories do die sets fall into?
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1. Forming
2. Cutting |
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Define Shallow Drawing.
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When the depth of the part is deeper than one-half the part radius.
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Define "Punch Penetration".
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The distance a punch will compress the material before fracture occurs.
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As the punch experiences breakthrough there is a reversal of forces. What is theis reversal of stresses called?
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Snap Through
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T or F:
Punches wear out about three times as fast as dies because th epunch muste penetrate the material and then be stripped out of it. |
True
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Why would you use a "stepped punch?
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Reduce required press tonnage.
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What is the rule of thumb regarding stepped punches?
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Maintain a stepping height slightly greater than the unch penetration debth.
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Why would you put a "shear angle" on a punch?
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To reduce required press tonnage.
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How do you determine shear angle on a punch?
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Equal to the metal thickness on the punch or die face.
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What thickness material can press brakes generally handle?
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Less than 10 gage (.141)
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What is the normal tooling type found on a press brake?
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90 degree
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What types of tooling can be found on a press break?
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1. Gooseneck
2. Hemming 3. Offset 4. Seaming 5. Radius 6. Channel forming |
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What are the factors to consider when specifying a press brake?
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1. Tonnage
2. Speed 3. Accuracy 4. Stroke Length 5. Controllability 6. Tooling |
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What determines if a roll forming machine is an "inboard" or "outboard" machine?
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How a roll is supported on a spindle.
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What is the maximum hardness (Rc) that can be sheared on a shearing machine?
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Rc 30
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What is the widest material size that most shears will handle?
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240" wide.
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What principle does CNC Punch Presses use?
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Shear
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Can punch presses be equipped with plasma and laser cutting equipment?
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Yes.
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