How to Bending Large Metal Radius Profiles DELEM DA58T
If a Press brake tool with large radius is not available, the bumping method can be chosen in CNC Press brake controller delem da58t 2d full touch screen bending controlelr .
With this sheet metal bending
method, a large radius in a product is obtained by a series of slight bends in succession.
First you can choose the Angle Definition. The available definitions are:
• The default angle is the angle which could be programmed as standard.
• The central angle is the supplement of the default angle (i.e. 180 degrees - default
angle)
To apply the bumping method, the following parameters must be programmed in deelm da58t bending controller:
Central bending angle
The supplement of the angle value to bend.
Radius
The intended radius which is programmed. As initial value the programmed product
thickness is used.
Number of segments
The number of segments in which the radius will be divided. The number of bends in this
radius is the number of segments plus 1.
The more segments you select, the more bends will be used to create the programmed
radius within a smaller tolerance. With a high number of segments you will need a
smaller V-die opening to be able to bend in a proper way.
Equal bumping-segments
When a product has a radius bend, the segment size is computed from the number of
segments, which has been defined by the user. Standard the first and last segment are
calculated half the size of the mid segments to obtain a better result. However, it can be
a problem selecting a die suitable to bend these small segments. Therefore the control
can calculate an equal size for all segments. This can be defined with this parameter.
• Disabled (no equal sizes)
• Enabled (equal sizes)
When Enabled all segments will have an equal size.
When Disabled the calculation is including half size segments. If in this case a problem
with the size of the V die is detected in the bend sequence determination, the user is
asked whether or not to select a re-calculation with equally sized segments.
When you must program such a bend, first program a standard angle with adjacent sides.
Then put the cursor back on the angle, tap the function Properties and select Bumping as
Bending Type. You will be prompted to program the radius, the number of segments and if you
like to have equal bumping segments or not. After programming these parameters the radius
is drawn in the product and a message will appear on the screen with information about the
smallest calculated segment length. The smallest segment length has consequences for the
selection of the die.
In case of a selected bumping bend a general correction for a bumping bend can be entered.
This function can be activated when the cursor is on the parameter for angle correction ('corr.
α1/α2'). It is only available if a product is loaded that contains a bumping bend.
With Bumping Corr. a new window appears in which the correction can be entered.
When the general correction of an angle is altered, all individual corrections are recalculated.
When any of the individual corrections is altered, the general correction is recalculated.
Bumping corrections can be programmed independently for both sides, α1 and α2.
When the general correction α1 is changed, it is automatically copied to α2 and as a result, all
separate corrections for α2 are recalculated. To change correction values of α2, use
correction α2 or one of the separate corrections of α2.
Hemming bends for flattening sheet metal forming profiles
When creating the required profile of the product with a hemming bend it is possible to first prepare
a flange with a prebend angle, place the cursor on the bend and select Properties. The sheet metal profiles bending
properties can be programmed in the pop-up window.
It is also possible to create a hem bending by placing the cursor on the flange end where the hem
bend is required and select properties. In this way the pop-up window will appear with an extra
parameter to fill-out.
Bend properties
Prebend angle
The required angle of the pre-bend, normally a sharp angle. The angle can be set upon
the best practical value, the default value is 30 degrees.
Hem opening
The hem bend can be made with a certain opening distance between the 2 flanges. The
hem opening value will be used calculating the beam position in the hemming process.
By default this parameter has the value of the Settings mode parameter Default Hem
Opening
Side properties
Side length
The length of the flange to hem.
