A device for expanding and shaping the end (1A) of pipes (1), comprising:
- a head (10C) comprising means (11) for removably connecting an expanding element (2) for said end (1A) of the pipe (1) to said head (10C),
- wherein said expanding element (2) comprises:
- a first elongated portion (2D) having an outer surface (2A) with a maximum diameter (D1) which is less than or equal to the internal diameter (D2) of the end (1A) of the pipe to be expanded and shaped, so that at least said first elongated portion (2D) of the expanding element can be introduced into said end (1A) of the pipe (1),
- and a second portion (2E) rigidly connected to said first elongated portion (2D), the second portion (2E) protruding relative to an outer circumference of said elongated portion (2D), departing from one end of the elongated portion (2D), and having a substantially discoid shape,
- said second protruding portion (2E) having:
- an inner extremal surface (2F) which rests on an abutting surface (10G) of the head (10C) of the device, so as to prevent the expanding element (2) from axially moving towards the inside of said head (10C) when it is deformed,
- and an outer extremal surface (2K) which is parallel to the inner extremal surface (2F), the outer extremal surface suitable to act as a stop for a free edge (1B) of the end (1A) of the pipe to be deformed and shaped;
- wherein said expanding element (2) comprises a central through hole (2B) arranged coaxially to a longitudinal axis (L1′) of said expanding element (2) and delimited by an inner surface (2C) of the expanding element (2), said device also comprising:
- an extracting member (3) comprising an expansion head (3A) suitable to move, coaxially to the longitudinal axis (L1′) of said expanding element (2), from the outside to the inside of said central through hole (2B) of the expanding element (2) so as to cause a deformation of said expanding element (2), and from the inside to the outside of said central through hole (2B) to allow said expanding element (2) to elastically return to an undeformed state,
- and means (4, 24 25 26) for moving said extracting member (3),
- characterised in that:
- the means (11) suitable for removably connecting the expanding element (2) to the head (10C) of the device comprise a fastening means (30) which stops against at least one intermediate surface (2G, 2H) of the expanding element (2) provided between the inner (2F) and the outer (2K) extremal surfaces of the protruding portion (2E) of the expanding element (2), the fastening means (30) suitable to keep said protruding portion (2E) of the expanding element (2) and the expanding element itself, bound to said head (10C) of the device for a plurality of succeeding deforming and shaping operations on respective ends of a plurality of different pipes (1), so as to keep the expanding element (2) rigidly constrained to the head (10C) of the device when said device is to be used to deform and shape the end of a pipe and when said expanding element (2) is to be extracted from the deformed and shaped end (1A) of the pipe (1),
- in that said fastening means (30) is removably constrained to an outer circumferential surface defined at a first end of a junction element (31) for said head (10C) so as to allow said expanding element (2) to be replaced when said expanding element (2) is worn out, the junction element (31) having said abutting surface (10G) defined on a free end thereof facing the free edge of the end of the pipe to be deformed and shaped, a second end of the junction element (31) defining an outer circumferential surface removably constrained to a body (5) of the device,
- in that at least said elongated portion (2D) of the expanding element (2) and at least one portion of the expansion head (3A) of said extracting member (3) protrude from said head (10C) of the device in an axially forward direction with respect to said junction element (31), so that the at least said elongated portion (2D) and at least one portion of the expansion head (3A) can be introduced into the end of the pipe to be expanded and shaped,
- in that the expanding element (2) for said end (1A) of the pipe is made of an elastically deformable material,
- and in that at least said elongated portion (2D) of the expanding element (2) is made of an elastically deformable polyurethane plastic material, having:
- a hardness between 45D and 60D,
- and an elongation at break between 400% and 600%, and/or a modulus of elasticity, at 300% of deformation, between 30 and 60 MPa.