Draw-bending machine
First Claim
1. A draw-bending machine comprising:
- a base frame (2);
a bending head (3) movably in engagement with the base frame (2) and including at least one bending die (4) rotatable about a bending axis (Z);
a support and positioning device (9) of said at least one bending head (3), said support and positioning device (9) being linked to the base frame (2);
handling and locking means (51) for a pipe (6) to be bent;
the support and positioning device (9) of said at least one bending head (3) presenting;
a first support arm (10) movably in engagement with the base frame (2), said first support arm (10) having a first end (10a) and a second end (10b) opposite to the first one (10a);
first actuating means (11) of the first support arm (10);
second actuating means (12) of the first support arm (10);
a second support arm (17) having a first end (17a) hinged on the first end (10a) of the first support arm (10) at a first articulation axis (J) and a second end (17b) hinged on the bending head (3) at a second articulation axis (K);
third actuating means (18) of the second support arm (17) around the first articulation axis (J);
fourth actuating means (19) of the bending head (3) around the second articulation axis (K);
the draw-bending machine being characterized in that the handling and locking means (51) for the pipe (6) to be bent comprises a first gripping unit (25) having a first (27) and a second (28) clamps aligned along a first alignment direction (P) to tighten the pipe (6) to be bent at two regions spaced apart from each other.
1 Assignment
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Accused Products
Abstract
A draw-bending machine comprises a base frame (2), a bending head (3) movably in engagement with the base frame (2), a support and positioning device (9) for the bending head (3), and handling and locking means (51) of a pipe (6) to be bent. The support and positioning device (9) consists of a first support arm (10) movable relative to the base frame (2) and a second support arm (17) having a first end (17a) hinged on an end (10a) of the first support arm (10) and a second end (17b) hinged on the bending head (3). The handling and locking means (51) comprises a first gripping unit (25) adapted to shift the pipe (6) to an operating space that can be reached by the bending head (3).
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Citations
25 Claims
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1. A draw-bending machine comprising:
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a base frame (2);
a bending head (3) movably in engagement with the base frame (2) and including at least one bending die (4) rotatable about a bending axis (Z);
a support and positioning device (9) of said at least one bending head (3), said support and positioning device (9) being linked to the base frame (2);
handling and locking means (51) for a pipe (6) to be bent;
the support and positioning device (9) of said at least one bending head (3) presenting;
a first support arm (10) movably in engagement with the base frame (2), said first support arm (10) having a first end (10a) and a second end (10b) opposite to the first one (10a);
first actuating means (11) of the first support arm (10);
second actuating means (12) of the first support arm (10);
a second support arm (17) having a first end (17a) hinged on the first end (10a) of the first support arm (10) at a first articulation axis (J) and a second end (17b) hinged on the bending head (3) at a second articulation axis (K);
third actuating means (18) of the second support arm (17) around the first articulation axis (J);
fourth actuating means (19) of the bending head (3) around the second articulation axis (K);
the draw-bending machine being characterized in that the handling and locking means (51) for the pipe (6) to be bent comprises a first gripping unit (25) having a first (27) and a second (28) clamps aligned along a first alignment direction (P) to tighten the pipe (6) to be bent at two regions spaced apart from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of bending pipes comprising the following steps:
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positioning a pipe (6) to be bent within an operating space to be reached by a bending head (3) defining a bending axis (Z);
the longitudinal axis of said pipe (6) being disposed along a first alignment direction (P);
the bending axis (Z) lying in a plane perpendicular to the first alignment direction (P);
shifting the bending head (3) a first time to engage the pipe (6) to be bent;
inclining the bending axis (Z) in a first reference direction (Z′
) to bend the pipe (6) in a plane perpendicular to said first reference direction (Z′
);
bending the pipe (6) around the bending axis (Z);
moving the head (3) away from the pipe (6);
axially shifting the pipe (6) along the first alignment direction (P) to change the bending region on said pipe (6);
shifting the bending head (3) at least a second time to engage the pipe (6) to be bent;
inclining the bending axis (Z) at least in a second reference direction (Z″
) distinct from the first one (Z′
) to bend the pipe (6) in a plane perpendicular to said second reference direction (Z′
);
bending the pipe (6) around the bending axis (Z);
wherein the step of positioning the pipe (6) to be bent involves the steps of;
adjusting the mutual distance of a first clamp (27) and of a second clamp (28) of a first gripping unit (25), said first clamp (27) and second clamp (28) being aligned along the first alignment direction (P);
gripping the pipe (6) to be bent with each clamp (27, 28) at two positions disposed a varying axial distance from each other, in order to tighten the pipe (6) at two regions spaced apart from each other;
moving the pipe (6) gripped by the gripping unit (25) within the operating space.
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Specification