Special Tooling Currently Available:  crush-bend tooling, automatic follow-bar return, wiper dies and ball mandrels for thin-walled tight radius tube bending, power clamping for high speed application, pneumatic mandrel extractor.

When you have a bending problem in production or design, Di-Acro can aid you at no obligation.  Just send blueprints, dimensioned sketches, or the part you wish to produce, to our Applications Engineering Department and your plans will receive prompt attention.

SPRING BACK – When determining the size of the Radius Pin or Collar, spring back should be compensated for.  A frequent way is by over bending slightly beyond the required angle.  After the amount of spring back has been determined, the Angle Gauge can be set so that all bends will be duplicated.  In addition to over bending, it may be necessary in some cases, to form the material around a Radius Pin or Radius Collar or smaller radius than the desired bend.  The actual size of the Radius Pin or Collar can best be determined by experiment for the material and conditions.

FORMING ROLLER – to eliminate work marking and reduce operator effort, it is often desirable to replace the Forming Nose (furnished as standard equipment) with a Forming Roller.

BUILD-UP FORMING NOSE – This is used to increase the material width range of Di-Acro Benders.  Must be used with wider or stacked radius collars.

There are two tube bending methods:

1. The “Forming Roller” method is recommended for (a) all large bends where centerline radius is at least 4 times the outside diameter (O.D.) of the tube,  (b) pipe and heavy wall tubing, and (c) very small diameter tubing.
2. The “Follow Block” method, which allows forming thin wall tubing to a centerline radius as small as 2-1/2” time the O.D. without using inside mandrels or fillers.

Guard against spring back (see above).  To prevent the tube from slipping during forming, the Quik-Lok Clamp is recommended, used with Type A Radius Collar.  For locking smaller size tubing the Clevis and Swivel Clamps with Type Radius Collars are used on No. 1 and No. 1A Benders.

PARTS REQUIRED FOR “FORMING ROLLER” BENDING METHODS – Grooved Radius Collar – one for every radius and tube size, Grooved Forming Roller – one for each tube size only, Clamp Block – for use with Quik-Lok Clamp on all Di-Acro Benders – one for each tube size, Swivel and Clevis Clamps – for No. 1 and No. 1A Benders – one for each tube size.

PARTS REQUIRED FOR “FOLLOW BLOCK” BENDING METHODS – Grooved Radius Collar – one for every radius and tube size, Forming Roller – one covers all “Follow Block” operations, Follow Block – one for each tube size only – listed length will accommodate a 180-degree bend, Clamp Block – for use with Quik-Lok Clamp on all Di-Acro Benders – one for each tube size, Swivel and Clevis Clamps – for No. 1 and No. 1a Benders – one for each tube size, Style B Collars only.