Presentation is loading. Please wait.

Presentation is loading. Please wait.

1 Coil Feed Systems Bruce Grant Coe Press Equipment Corp.

Similar presentations


Presentation on theme: "1 Coil Feed Systems Bruce Grant Coe Press Equipment Corp."— Presentation transcript:

1 1 Coil Feed Systems Bruce Grant Coe Press Equipment Corp.

2 2 Agenda  Coil Feed Systems  Considerations For Selection  Unwinding  Straightening  Slack Loops  Feeding  Question And Answer

3 3 Coil Feed Systems Selection Determines:  Versatility  Productivity  Floor Space Variety Of Solutions

4 4 Considerations For Selection  Speed Requirement  Floor Space  Purchase Price  Energy and Maintenance Cost  Safety  Coil Weight  Range of Materials  Material Finish  Run Time Between Reloading  Loading/Threading Time

5 5 System Components  Uncoiler  Straightener  Slack Loop  Feed

6 6 Uncoiler Types  The 3 most common types of uncoilers. Coil Cradle Centering Reel Pallet Reel

7 7 Coil Cradle: Concept  The Coil Is Supported On Rollers  Medium to Heavy Gauge Materials  Materials Not Sensitive To Marking

8 8 Coil Cradles - Advantages  Coil Weight prevents clock-spring.  Unlimited weight capacity.  Payoff speed does not vary as coil diameter changes.

9 9 Coil Cradles - Disadvantages  Marking and distortion of thin or cosmetically sensitive materials.  Not suitable for rewinding and re- banding partially run coils.

10 10 Coil Cradles - 2 Basic Styles  Inline Style  Combination Style

11 11 Inline Style Cradle  Unwinds coil from the bottom.  Payoff is away from the press.  Easier to thread.

12 12 Inline Style Cradle  Space Saver  Overhead loop uses vertical space instead of floor space

13 13 Combination Style Cradle  Unwinds coil from top.  Pays off through a powered straightener into conventional loop.

14 14  Unobstructed access for loading.  Allows use of a load ramp for fast coil change. Combination Style Cradle

15 15  Threading  More difficult to thread thick or high strength  Floor Space  Requires more floor space due to its conventional loop configuration. Combination Style Cradle

16 16 Pallet Reels: Concept  Coils are stacked on a turntable and unwound laying on their side

17 17  Narrow material  Thin material  Low strength material  Where marking is not a concern Pallet Reels: Applications

18 18  Loading  Coils can be stacked  No need to upend narrow coils  Space Saver  Loop is contained around and above coil and does not use much floor space. Pallet Reels: Advantages

19 19  Limited material Width Capacity  Strip must transition from vertical to horizontal  Payoff Rate Changes With Coil Diameter Pallet Reels: Disadvantages

20 20  Clock spring Danger  Limited to light gauge, low strength materials  Threading aides for thick or high strength material are not normally available YOW!! Pallet Reels: Disadvantages

21 21 Centering Reels: Concept  Coil is held by its inside diameter  Most common method of unwinding  Available in a variety of configurations

22 22 Centering Reels: Applications  Can accommodate a wide variety of materials  No contact with outer wraps of material as unwound  Great for non-marking applications

23 23  Options available to safely and effectively thread thick or high strength material.  Allows rewinding, banding and removal of partially run coils. Clockspring Guard Hold Down With Motorized Wheel Peeler Breaker Centering Reels

24 24  Motorized units with loop control for payoff into slack loop.  Used where straightening is not required or can be used with pull through straighteners or feeder/straightener units. Centering Reels: Powered

25 25  Known as “Pull Off Reels”  Pinch rolls or powered straightener pulls material off coil  Requires a drag tensioning device prevents coil overrun Centering Reels: Non-Powered

26 26  Fixed position.  Coil must be centered on mandrel when loaded. Centering Reels: Stationary

27 27  Reel runs on a track  Allows realignment after the coil has been loaded and threaded.  Can run multiple coils Centering Reels: Traveling

28 28  Great for quick coil changes  Great for running partial coils  Requires more floor space Centering Reels: Double Ended

29 29 Dual Cone/Double Stub Arbor  Used for very heavy or very wide coils, with small inside diameters.  Support at both ends prevents mandrel deflection.  Can reposition coil after threading

30 30 Straightening  Purpose  To remove unwanted material shape defects  Requirements  Vary per application depending on the material defects present, the design of the die and the finished part requirements.

31 31  Bend the material around sets of rollers to alternately stretch and compress the upper and lower regions to exceed the yield point so that all surfaces are the same length after spring back. Straightening: Concept

32 32  Strain  Elastic Modulus  Stress  Elastic Limit  Yield Point  Springback Straightening: Concept

33 33  The result of winding strip into a coil  Length difference between top and bottom surfaces  Results in curved shape Straightening: Coil Set

34 34  Effectiveness is a function of roll center distance, number of rolls and power available Straightening

35 35  Precision Leveler  Straightener Straightening: Methods

36 36 Precision Leveler  Material Conditions Corrected  Coil Set  Edge Wave  Center Buckles  Crossbow  Coil Breaks  Deep Stress Relief

37 37  19 to 21 work rolls  Small diameter rolls  Very close roll center distance  Adjustable flights of backup rolls Precision Leveler

38 38  Removes coil set and minor crossbow only  Typically 5 to 11 work rolls  Larger roll diameter  Wider roll spacing  Backup rolls not adjustable Straightener/Flattener

39 39  Available in various roll configurations  5, 7, 9 and 11 roll versions  Additional roll sets allow running entire coil without readjustment of straightening rolls Straightener/Flattener

40 40  Pull Through Straighteners  Non-driven rollers  Located after the loop  Material is pulled through the straightener by the feeder  Powered Straighteners  Driven rollers  Located before the loop  Often used to pull material off of the coil Straightener/Flattener

41 41  Inexpensive and compact  Allows shorter loop length Straightener: Pull Through

42 42  Pull Through Straightener Disadvantages  Material marking  Slippage and inaccurate feed lengths  Requires power from the feeder for straightening.  Limits material capacity  Decreases feed speeds  Less effective pilot release Straightener: Pull Through

43 43 Straightener: Powered  Advantages:  Less marking  Higher production speeds  Greater material capacity  Straightener/Feeders

44 44 Slack Loop: Purpose  Material storage to supply the feed while the unwinder accelerates to line speed  To absorb and store material while the coil decelerates after feeding stops  To allow the coil to run at a constant speed

45 45 Slack Loop  Types  Horizontal  Overhead  Paddle Horizontal Loop Paddle Loop Overhead Loop

46 46  The amount of material stored is equal to the total slack length minus the straight line length. Straight Line Length Slack Length Slack Loop

47 47  If the material is straightened prior to the loop then the radius of the loop cannot be smaller than the Minimum Bend Radius for the thickest material that will be run on that line. Slack Loop

48 48  The strip must be supported into and out of the loop by cascade rolls at both ends.  Without support the weight of the loop will cause the material to be bent beyond its minimum bend radius resulting in material that is no longer flat. Slack Loop

49 49  Gripper Feeds  Roll Feeds  Press Driven  Servo Driven  Straightener/Feeder Feeds: Types

50 50  Uses linear motion to move the strip  Uses clamping mechanisms to hold and move the strip Feeds: Gripper

51 51  Powered by:  Compressed air  Hydraulic  Servo Drive and Ball Screw Feeds: Gripper  Applications:  Slow To Medium Speeds  Medium to Heavy gauge materials

52 52 Advantages:  Low acquisition price  Mechanically and electrically simple  Accurate if properly maintained and set up  Widely used with pull through straighteners  Flexible feed and pilot release timing Feeds: Gripper

53 53 Disadvantages:  High maintenance cost  Limited speeds  Long set-up time  High operating cost  Material marking  Limited feed length capability  No inherent inching capability Feeds: Gripper

54 54 Roll Feeds  Press Driven  Servo Driven  Straightener/Feeders

55 55  Rack and Pinion Feeds  Cam Feeds  Powered by the press  Synchronized to press motion Roll Feeds: Press Driven

56 56  Applications:  Full range of materials  High speed applications  Non-marking capability Roll Feeds: Press Driven

57 57 Advantages  High cycle rates  Synchronized to press motion  Very accurate  Mechanically and electrically simple Roll Feeds: Press Driven

58 58 Disadvantages  Mechanical linkage to press  Limited feed length capability  Limited adjustment of feed timing  No inherent inching capability Roll Feeds: Press Driven

59 59  Powered By A Closed Loop Servo Drive  Microprocessor Based Motion Control Roll Feeds: Servo Driven

60 60 Roll Feeds: Servo Driven  Applications:  Full range of materials  Non-marking capability  Medium high speed applications

61 61  Rapid set up  Unlimited length capability  Flexible feed timing and window  Inherent Inching Capability  Low maintenance  Interface with press automation Roll Feeds: Servo Driven

62 62  Wide variety of configurations and control options:  Synchronization to press motion  Step programmability  Push-Pull Feeds  Zig-Zag Feeds  Straightener/Feeders Roll Feeds: Servo Driven

63 63 Roll Feeds: Servo Driven  Straightener Feeders  Compact Coil Lines

64 64 Conclusion  There is no “one size fits all” solution.  Don’t limit your capabilities through equipment selection.  Consider all aspects when selecting your system. Summary & Conclusion


Download ppt "1 Coil Feed Systems Bruce Grant Coe Press Equipment Corp."

Similar presentations


Ads by Google