Steve Brown is bending product manager,  Wilson Tool International.Click image to enlargeby Steve Brown 

 When left to their own devices, press brake operators come up with all sorts of creative ways to curb deflection, aka the “canoe effect” when bending longer parts in the press brake. Often, there are so many scraps of paper or cardboard left behind from repeated efforts to shim the die to achieve a consistent angle that their shop looks like an elementary school craft project went awry. 

The reason for this is that any time you are bending a part over four feet long on a press brake that part is susceptible to deflection. A result of uneven downward pressure combined with slight nuances built into the machine itself, deflection occurs when more tonnage is applied to the ends of the beams than in the centre. This causes the angle of the bend to be tighter on the left and right and less so in the middle, creating a bow in the bend angle. 

A common method for countering the “canoe effect” is to manually shim press brake dies using folded paper or cardboard in order to offset the deflection. However, doing so requires a significant amount of trial and error resulting in costly downtime. And once a solution is found, it’s not easily repeatable the next time you need to perform the same bend, which means you’ll waste even more time tinkering to find the same solution over and over again. 

Wilson ToolsClick image to enlargeFortunately today, press brake crowning systems are available from the machine OEM and aftermarket suppliers that take the guesswork out of correcting sheet metal bowing. Crowning systems are installed in the lower beam of the press brake to offer precise crowning and micro tuning of the die. Crowning adjusts the beam up to 3.5 mm (.137 in.), depending on length, with available micro adjustment at points every 200 mm (7.87 in.) on the beam for fine-tuning up to 5 mm (.020 in.)

Not only are crowning systems faster to set up and more precise than manual shimming, the results can be repeated setup after setup with no tinkering required. 

Crowning systems generally have two key features: a method to hold the die and a way to control deflection. Die holding can be accomplished with set screws every inch along the beam for manual tightening or with hydraulic actuation.

Deflection is controlled using either a manually adjustable hand crank for overall height control and digital display to measure movement. Or crowning can be adjusted via the machine control using a CNC controlled electric motor. 

Producing consistently straight bends in long parts shouldn’t be a game of guess and check, where the operator with the most creative solution wins one round, with the answer for the next round being anyone’s guess. 

Instead, installing a crowning system will eliminate the guessing game and improve your press brake profitability by significantly reducing unnecessary downtime and producing consistently higher quality bends. SMT

Steve Brown is bending product manager, Wilson Tool International.

Translas partners with Gullco on distribution deal

Translas, a global manufacturer of on- torch fume extraction solutions, has announced a distribution partnership with Gullco International Ltd. Based in Newmarket, Ont., Gullco will be the global distributor of Translas’ newest fume extraction solutions, namely Translas 7XE Semi-Automatic Fume Extraction welding gun and the ClearO2 W-Series hi-vac units, designed and engineered for welding automation.

'Dr. Bender' Paul LeTang set to retire

After seven years working at Bystronic, and a career in sheet metal fabrication spanning five decades, Paul LeTang, bending guru and press brake product manager for Bystronic Inc., is set to retire on March 2, 2020.

Bystronic’s FL 170 3D fiber laser tube cutting machine

Check out Bystronic's latest fiber laser tube cutting machine in action

Metal Supermarkets launches start of 7th “Metal My Way”

Metal Supermarkets, in partnership with sponsors OMAX Abrasive Waterjets and Cosen Saws, are kicking off the 7th annual "Metal My Way" contest, which gives individuals in the welding and fabricating community an opportunity to show off their metal creations.

Fast and easy programming for robotic bending

The LVD Dyna-Cell robotic bending cell is now available with LVD’s Easy-Form Laser adaptive bending system and features a revolutionary, automatic wizard for fast and easy programming.

Samuel acquires 100% of additive business Burloak Technologies

Samuel Son & Co., Ltd., a Burlington, Ont.-based metals distributor and industrial products manufacturer, has acquired all remaining shares of Burloak Technologies, an engineering and design contract manufacturer for additive manufacturing (AM), materials development, high precision CNC machining, post-processing and metrology.

Automation Mindset

Investment in automation forms success for Ontario fabricator

Bystronic adds to Western Canadian sales team

  

Bystronic Canada Ltd. has announced that Terry Matheson and Gannon McSween are joining as direct sales personnel for Alberta, British Columbia, Manitoba and Saskatchewan.

Additive Manufacturing Update: The Shape of Metal

by Noelle Stapinsky

Additive manufacturing is finally a player in the future of metalworking 

Boosting skilled trades

Labour union training centres playing bigger role in apprentice training in fabricating, welding

by Mary Scianna

Apprenticeship programs in Canada have a long history.

US shipbuilder orders one-of-a-kind all electric bender

First of its type ever built, machine will bend up to 8 in. (219 mm OD) diameters

The largest all-electric bender of its kind in the world will be in place at the end of this year at a US shipbuilder's facility after bending machine manufacturer Unison received an order from Newport News Shipbuilding (NNS) for an all-electric machine capable of bending large bore tubing and piping up to eight in. (219 mm OD) in diameter.

Canada's bedrock: Job shops in Canada

G B Fabrication
Ghislain Levasseur, a certified truck and car mechanic, and his brother Bruno,

On a roll

by Mary Scianna

Manufacturers gearing up for growth

The manufacturing industry is undergoing a renaissance.

$3 M for Windsor automotive manufacturers

Two Windsor manufacturers are the latest recipients in a recent slew of funding announcements by the Federal government. Newmak of Canada Corp. in partnership with Arbec Tool and Machine Ltd., both based in Windsor, ON, have received funding of up to $3 million to support development of stronger engine blocks made of lightweight aluminum.

Choosing an annular cutter

There is more than one type of annular cutter for different alloys

Stay In Touch

twitter facebook linkedIn