Bending and squeezing blade for sheet metal bending and squeezing machine and machine utilizing the aforesaid blade

A machine for bending and squeezing a sheet metal, comprising:

• a fixed counterblade which defines a resting plane for the sheet metal;
• a mobile blank holder which is movable towards the counterblade to lock the sheet metal on said resting plane;
• a bending blade which is movable and engageable with the counterblade and the blank holder in order to bend and squeeze a peripheral edge of the sheet metal;
• and
• bending blade driving means for moving the bending blade in perpendicular and parallel directions with respect to said resting plane,
• wherein said bending blade is provided with a bending tooth having a head surface for causing bending of the peripheral edge of the sheet metal at an angle of 90° with respect to said resting plane and a foot surface for causing subsequent bending of said peripheral edge to an angle greater than 90° with respect to said resting plane and subsequent squeezing of said peripheral edge onto a remaining part of the sheet metal up to an angle substantially equal to 180° with respect to said resting plane,
• wherein said foot surface is substantially parallel to said resting plane and is slightly inclined toward said head surface from a front end faced to the sheet metal to a rear end.

A machine for bending and squeezing a sheet metal, comprising:

• a fixed counterblade which defines a resting plane for the sheet metal;
• a mobile blank holder which is movable towards the counterblade to lock the sheet metal on said resting plane;
• a bending blade which is movable and engageable with the counterblade and the blank holder in order to bend and squeeze a peripheral edge of the sheet metal;
• and
• bending blade driving means for moving the bending blade in perpendicular and parallel directions with respect to said resting plane,
• wherein said bending blade is provided with a bending tooth having a head surface for causing bending of the peripheral edge of the sheet metal at an angle of 90° with respect to said resting plane and a foot surface for causing subsequent bending of said peripheral edge to an angle greater than 90° with respect to said resting plane and subsequent squeezing of said peripheral edge onto a remaining part of the sheet metal up to an angle substantially equal to 180° with respect to said resting plane,
• wherein said head and foot surfaces are connected by a substantially perpendicular front surface.

A machine for bending and squeezing a sheet metal, comprising:

• a fixed counterblade which defines a resting plane for the sheet metal;
• a mobile blank holder which is movable towards the counterblade to lock the sheet metal on said resting plane;
• a bending blade which is movable and engageable with the counterblade and the blank holder in order to bend and squeeze a peripheral edge of the sheet metal;
• and
• bending blade driving means for moving the bending blade in perpendicular and parallel directions with respect to said resting plane,
• wherein said bending blade is provided with a bending tooth having a head surface for causing bending of the peripheral edge of the sheet metal at an angle of 90° with respect to said resting plane and a foot surface for causing subsequent bending of said peripheral edge to an angle greater than 90° with respect to said resting plane and subsequent squeezing of said peripheral edge onto a remaining part of the sheet metal up to an angle substantially equal to 180° with respect to said resting plane,
• wherein the blank holder is provided with a pressing member which is driven to project from a bottom surface of the blank holder to lock the sheet metal onto said counterblade during squeezing of the peripheral edge of the sheet metal.