12. STANDARD PUNCH PRESS TYPICAL TURRET LAYOUT = Forming Tool = Adjacent stations without tooling 20 Station Turret
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14. CONVENTIONAL STATION VS. UPFORMING STATION This lance and form could never be achieved in a conventional machine. Machine with forming station makes it possible! Forming die operated by forming cylinder Die Line
23. MINIMUM SPACING BETWEEN FORMS Minimum = 3 x material thickness to sheet edge or form on sheet Minimum = 6 x material thickness to like forms 3 x T Minimum Material Thickness (T) 6 x T Minimum 3 x T + R Minimum Radius (R) Radius = 1/2 x T
24. SPRING LOADED VS. NON-SPRING LOADED Non-Spring Loaded Die Line Spring Loaded Die Line
38. Clusters: Solid or Insert Insert Style Solid Style Features Solid Insert Fully Guided Available Yes Yes Initial Cost Lower Higher Replacement Costs Higher Lower Punch Point Spacing Closer Farther Pattern Size Larger Smaller Punch Point Size Recommended Larger Smaller Sharpening Easier Harder
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46. CALCULATING CLUSTER TONNAGE PUNCHING FORCE FORMULA = linear length of cut x material thickness x shear strength = punching force in kilonewtons (kN). PUNCHING FORCE SHOULD NOT EXCEED 75% PRESS CAPACITY. EXAMPLE: Grid of .250(6.35) diameter holes. Area of punch covers 48 holes; punch every 4th hole (12 holes). Mild steel .060 (1.52) thick. (Linear length of cut = 3.14 x diameter x number of punches). Spring pressure of the spring-loaded cluster assembly runs under a ton (9 kN) and can be ignored in calculations for machine capacity. SHEAR STRENGTH IN US tons/in 2 (kN/mm 2 ): Aluminum 5052 H32 = 15.0(0.2068) Brass = 17.5(0.2413) Mild Steel = 25.0(0.3447) Stainless 304 = 50.0(0.6894) Clusters: Tonnage
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48. Clusters: Tool Life Using cluster tools reduces the number of hits…and machine and tool wear Cluster tooling will produce patterns with just 172 hits vs. current 2,064 hits
61. Extrude, OR … Punch and Shave Finished hole size is the starting point. Punch #1 = finished hole size – clearance (20%) Die #1 = finished hole size + 0.1 mm Punch #2 = finished hole size (full mat’l contact : Maxima !) Die #2 = die #1 .
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65. Lance and Form The ‘form’ part of the operation takes place as the work piece is squeezed between the lower unit and an inverted die in the upper unit. The ‘lance’ is normally performed by the lower unit using an inverted punch.
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67. Lance and Form: Design Considerations Lower tool travel is what typically limits the form height. Spring Back Thicker materials may break before completing form and cause too much abuse on lower insert. Angle is typical, may be increased if form height decreased. SHEET METAL PARAMETERS Maximum Height .250(6.4mm) R = .060(1.5mm) Minimum 85º Maximum Maximum Thickness .120(3.0mm) OPEN END 85º Maximum 45º Maximum OPEN END CLOSED SHAPE
106. Shear Button One tool produces the form in each mating part. Using shear buttons to square large sheets... Conventional use of shear buttons... Shear buttons in lower plate fit into matching holes in upper plate... Shear buttons used as weld projections for precision placement of plates to be welded together...
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112. EasySnap™ Use for easy part removal and skeleton breakdown Use when a formed flange needs extra material for gauging and forming. Snap off extra after form is made
124. HINGE TOOLS Tool 1 makes 2 hits: Pre bending and rising the pre-bended tap with axis movement in between Tool 2 makes one hit and finishes the hinge Tool 1 Tool 2
134. SHEETMARKER ™ Three springs, two points (120 & 150) allow control of depth and width of the line scribed Flexible, programmable marking
135. Score Plastic Protection for removal before laser cutting or fabrication ( bending lines etc.) Cuts trough the protective plastic film without leaving any marks on the metal surface .
136. Mate EasyMark Springs: 3 Types to be used for diamond or Brass Inserts Spacer: Use for dead weight on top of Ink Marker Punch: for installing and removing inserts Ink Marker pen Insert Holder 3 Inserts (2 diamond, 1 brass) Allen Wrench: for installing and removing inserts Die: Used for SheetMarker and InkMarker Spacer: Use with SheetMarker A-station Holder
Post dwell is a programming command to allow the tool extra time to strip before advancing material to next coordinate, and may be required for certain applications.
Use FG when you have small point size or close to material thickness…. Punch head drives proximity and range
How do you make a wok? Answer: You bang on one side until it becomes a bowl shape……