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TECHNICAL GUIDE

PRESS BRAKE TOOLS

vol.6 ABOUT TOOL SELECTION

TECHNICAL GUIDE

BENDING TOOLS

vol.6 ABOUT TOOL SELECTION
(STEPS FOR CHOOSING A TOOL, STUDYING FROM THE DRAWINGS, READ DETAILS FROM DRAWINGS)

Until Vol.5, preparation for tool selection has been described, but from this time on,
it will be into a practical tool selection method. This page features "V-bending" and "R-bending".
These bending methods are considered "standard machining procedures" and account for the majority of standard tools in the catalog.

ABOUT TOOL SELECTION
ABOUT TOOL SELECTION Fig.1
ABOUT TOOL SELECTION Fig.2

STEPS FOR CHOOSING A TOOL

When choosing the tool, it is necessary to check the completed and development drawings and make a comprehensive determination.

To do so, it is important to check that all necessary conditions are met and to select the appropriate tool.
When the phenomenon such as "Bending is insufficient and angle does not come out" or "Poor accuracy" appears, it is common when the following contents are omitted.

〔 Check the following items to make a comprehensive decision. 〕
  • 1．Machine specifications
  • 2．Determine V width
  • 3．Tool combination
  • 4．Bending sequence
  • 5．Required pressure (withstand pressure)

STUDYING FROM THE DRAWINGS

Study the contents of the table below from the drawing and select the tool.

Confirmation items Confirmation contents
Material (SPCC / SUS / AL) Allowable tonnage, tool tip angle (against spring-back)
Material Thickness Selection of V groove width, tool pressure resistance tonnage for required bending tonnage
Bending length Allowable tonnage, Length and depth of machine table length side plate
Inner radius Coining (inner R0.8t～)
Air bending (General bending)(inner R1t～2.8t)
R-bending (inner R2.8t or more)

READ DETAILS FROM DRAWINGS

Basic tools can be selected from the contents on the previous page,
but there are cases where it is necessary to select tools that require simulation, such as "complex bending" and "multi-point bending."
Please see below.

Together with the items on the previous page
  • 6．Select the machine to use
  • 7．Tool specification
  • 8．Determine working conditions
Confirmation items Confirmation contents
Bending length / height Minimum length = V-width x 0.7
Table length, Flange length / side plate distance
Z bending dimension V-groove depth
1st process, Bending height (Material thickness step),
Total width of inverse bending Die length
Box bending Punch length
Tooling points such as burring Tool interference
Box bending / Width dimension Sectional tool length
Hole position near the bending part Beware of deformation
Width dimension / Weight Number of people performing bending, Storage of product
Accuracy Check bending order
Surface condition
(Surface without scratch)		 Scratch prevention measures
(Die shoulder R, Plating, etc.)

When choosing a tool, double check that you have a die!

Surprisingly, they often see the punch and forget the die.
The die has a large effect on the processed material, such as scratches and deflection on the product,
so check it carefully.

When choosing a tool, double check that you have a die!

Check the dies before starting work,
and safely perform high-quality bending.

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vol.6 ABOUT TOOL SELECTION
(STEPS FOR CHOOSING A TOOL, STUDYING FROM THE DRAWINGS, READ DETAILS FROM DRAWINGS)(798KB)