Cam Product Training
What is a Cam Slide Unit? Cam: A mechanical device that converts one linear motion to another linear direction Cam Slide Unit: ...
What is a Cam Slide Unit? Cam: A mechanical device that converts one linear motion to another linear direction Cam Slide Unit: An in-die mechanical device in a metal stamping die that performs a mechanical function with attached tooling
Cam Applications Cams are typically used in the following applications • • • • • •
– Cams can be uses anywhere press motion must be redirected from one direction to another.
Types of Cams •External / outboard Vox style
• Aerial (NAAMS Standards)
•Internal / inboard box style
• Die mount (NAAMS Standards
•Mini-cam / barrel style
• Milfab
Cam Features • Hardened surfaces • Self-Lubricating wear surfaces • Soft mounting face on driver • Choice of mechanical or nitrogen springs with most models • Component parts marked with serial number for easy re-assembly • Positive returns on aerial and die mount models • Wide range of cam angles up to 60 degrees on Aerial • Product templates for easy die design on CD or Web Site
Driver Driver Retainer Slide Top Plate End Plate Body Spring Spring Guard Stud
Internal Bump Cam • • • • • • •
Driver Driver Retainer Slide End Plate Body Spring Base Plate
Mini-Bump Cam • • • • • • • • •
Driver Driver Retainer Screws Slide Dowel Body Spring Guide Plate Punch Retainer
Milfab Models • Inboard Spring • Outboard Spring • Gas Spring
Why Milfab? • Small economical cams provide us with excellent margins and expands the cam market • Good name recognition • Ongoing punch sales • Serial Numbers and order records are maintained at Milfab for quick replacement part turnaround • Milfab has the ability to manufacture like cams in lot sizes for customers
Inboard Model •
Body
•
Trigger
•
Pivot Pin
•
Punch Plate
•
Strap
•
Spring Rod Spring
•
Spring Cage
•
Steel Washer and Urethane Stripper
•
Punch
•
Grease Fitting
Inboard Features • Urethane stripper and washer standard (use on flat surfaces or where urethane can compress) • Internal spring • Small and compact • Standard Trigger when used 0 to 15 degrees • Optional offset trigger used if mounted from 15 to 60 degrees
Outboard Model •
Body
•
Trigger
•
Pivot Pin
•
Punch Plate
•
Strap
•
Spring Rod and lock nut
•
Spring
•
Spring Cage
•
Punch
•
Body and Grease Fitting
Outboard Features
• External Spring for stripping punch • For use on Curved surfaces • Part must be held for stripping in some external means • Standard Trigger when used 0 to 15 degrees • Special offset trigger used if mounted from 15 to 60 degrees
Gas Spring Model •
Body
•
Trigger
•
Gas Cylinder
•
Pivot Pin
•
Punch Plate
•
Strap
•
Spring Rod and lock nut
•
Spring
•
Spring Cage
•
Punch
•
Body and Grease Fitting
Gas Spring Features • External Spring for aid in stripping and returning unit • Gas spring for high stripping force • For use on larger holes or any area requiring a large stripping Force • Part must be held for stripping in some external means • Same footprint as outboard models • Standard Trigger when used 0 to 15 degrees • Special offset trigger used if mounted from 15 to 60 degrees
Top(PH) Mounted Units
Top Mounted Units
•
Inboard, Outboard, and Gas Spring models can all be set up for top mounting
•
Oil impregnated bronze bearings added to top mounting units for punch lubrication
•
Standard Trigger when used 0 to 15 degrees
•
Special offset trigger used if mounted from 15 to 60 degrees..
Choosing the Right Model • Material Thickness • Type of part • Punch stroke • Punch force or tonnage • Stripping Force • Point size • Point Shape
Other Considerations • Mounting angle and trigger style • Shaped punches need key flats • Oil impregnated available bearing on std. models • Stripper displacement • Special designs
Die-Mount / Lower Cams / Downstairs Cams:
• Cam is mounted to the die shoe or lower shoe. • Typically work at angles of 0 30 degrees
Die Mount Cams • • • • • • • •
Driver Slide Body Side Gib Plates Wear Plates Spring Spring Retainer Assembly Positive Return
Aerial / Upper / Upstairs / Flying • Popularized in transfer presses; reduce number of dies. • Cam is mounted to upper shoe or punch shoe of the die • Typically work at an angle of 30-60 degrees. • 0-30 degrees where work and cannot clear the cam if die-mounted.
Aerial Cams • • • • • • • • •
Driver UV Blocks Slide Body Side Gib Plates Wear Plate Wearstrip Spring Spring Retainer Assembly • Positive Return
Other Types of Cams - Hydraulic
• Used for negative angle or very low shut height applications. • Non-press pierce/work unit. • Hydraulic power pack with a return spring. • Non-mechanical cam.
Other Types of Cams - Rotary
• Fill units where rotary slide moves into position to allow negative flanging • Rotary moves out of position to accommodate removal of the part or panel • Replaces drop slides with less space
Other Types of Cams - Giant • Used primarily in the automotive industry • Can handle multiple operations in one movement • Sizes range from 400 - 1600 mm • Some manufacturers use multiple large cams to make larger “Giant Cams”
Estimated World Cam Market Worldwide Cam Sales in Millions
$17.5
$24.5
North America Europe
$27.5
Pacific Rim
RATIONALE FOR BUILDING YOUR OWN CAM SLIDE UNITS IN-HOUSE
• Slow Economy • Personal Satisfaction --- My Quality is Better • Special Applications • Perception of being cheaper
Bump Cam Slide • Nested in a Cam Body. • Soft Mounting Face. • Angular section to accept driver – Driver pushes slide so it moves or “travels” • Lubrication by self-lube wear surfaces
Bump Cam Body
• Houses the Slide ; affixed to the die ; does not move. – Slide “travels” within the Body • Provides the Accuracy of the Cam Work • Typical clearance between the Cam Body and the Slide is .002 (slip fit, no slop)
Bump Cam Driver
• The driver accepts the force of the press. • The angular section of the driver acts on the slide.
Bump Cam Spring Assembly
• Spring rod attaches to the slide • Spring compresses during the sliding action against endplate • Returns the slide when the die opens • Can aid in part stripping
Miscellaneous Details
• End Plate
• Top Plate
• Driver Retainer
Glossary of Terms Driver Slide Body Slide face Travel Spring Guard Retainer Positive return
causes the slide to move forward contained within the body and holds the tooling contains and guides the moving slide location on the slide where the tooling is affixed maximum movement of slide the mechanism to return the slide to its home position the protection device surrounding the spring prevents the driver from disengaging from the body ensures the slides return to the home position
