Mandrel holder head with release device

Patent metadata

Field	Value
Publication number	US-9446438-B2
Application number	US-22575407-A
Country	US
Kind code	B2
Filing date	Mar 26, 2007
Priority date	Mar 27, 2006
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A mandrel holder head with release/fastening device of the mandrel for rolling metallic tubes comprises a mandrel holder ( 1 ) which accommodates within an internal seat a half collar ( 2 ) of externally cylindrical shape through an opening in the side wall. In the internal seat are accommodated both an end part ( 52 ) of the mandrel shank and the half collar ( 2 ) through the opening. The half collar has an internal cavity with a second longitudinal side opening which accommodates a second part ( 51 ) of the shank of diameter smaller than that of the first part ( 52 ). The half collar is divided along an axial direction into two cylindrical parts ( 21, 22 ) which have different diameters. The locking member ( 30, 31 ) of the half collar ( 2 ) holds it in the mandrel holder ( 1 ) seat in working conditions, while allowing shank release with an axial movement in locked conditions.

First claim

The invention claimed is:

1. A mandrel holder head adapted to releasably engage a mandrel used for rolling metallic tubes, where said mandrel has a first end part, having an outer diameter, an opposite end part having an outer diameter, and an intermediate part having an outer diameter, said outer diameters of said first and opposite end parts being greater than the outer diameter of said intermediate part, said mandrel holder head comprising:
a. a support member having a first cavity with a first lateral opening, said first cavity being adapted to receive said first end of the mandrel, and
b. an intermediate member having a second internal cavity adapted to cooperate with said support member, said first cavity of said support member being adapted to receive said intermediate member where said cavities of said intermediate member and said support member have a common central axis,
said intermediate member having said second cavity with a second lateral opening oriented axially that is adapted to accommodate said intermediate part of the mandrel, and being adapted to selectively restrain said mandrel in said mandrel holder head or to be rotated about said central axis to allow removal of said intermediate member transversely of said central axis from said support member, followed by extraction of said mandrel from said support member in the direction of said central axis.

2. The mandrel holder head according to claim 1 , wherein said intermediate member has an external cylindrical shape that is divided along its axial direction into first and second portions, where the external diameter of the first portion is larger than the external diameter of the second portion, the first portion being provided with a locking member adapted to be releasably fastened to said support member, so as to prevent a release of the intermediate member through a first longitudinal opening in a first predetermined operating condition, or to allow the release the intermediate member through the first longitudinal opening in a second predetermined operating condition.

3. The mandrel holder head according to claim 2 , wherein the intermediate member second portion comprises an end part that is engageable for rotation of said intermediate member about said central axis into said second predetermined operating condition for release of said intermediate member from said support member.

4. The mandrel holder head according to claim 2 wherein said locking member comprises two separate parts circumferentially separated from each other for engaging said intermediate member.

5. The mandrel holder head according to claim 1 , wherein said first cavity and said second cavity, each having a U-shape in a section plane transverse to said central axis.

6. The mandrel holder head according to claim 5 , wherein the shape of the first cavity of the support member is complementary to an external surface of said intermediate member so as to create a shape coupling between the support and intermediate members and so as to allow a rotational movement of the intermediate member with respect to the support member to allow a release/fastening operation of said intermediate member with respect to said support member.

7. The mandrel holder head according to claim 1 , operable with a lifting device having an externally threaded stem, said intermediate member having a threaded hole adapted to be engaged by said threaded stem of said lifting device for lifting said intermediate member to be lifted away from said support member by said lifting device.

8. A mandrel holder head adapted to releasably engage a mandrel used for rolling metallic tubes, where said mandrel has a first end part, and an opposite end part where both parts have an outer diameter, and an intermediate part having an outer diameter less than the outer diameter of said first and opposite end parts, said mandrel holder head comprising:
a. a support member provided with a generally cylindrical first cavity with a first lateral opening along a central axis,
said first cavity adapted to rotatably engage said first end part of said mandrel, and

b. an intermediate member axially alignable with said support member and having a second cavity axially aligned with said first cavity and said second cavity adapted to receive said intermediate part of said mandrel, whereby said support member can selectively restrain said mandrel in said mandrel holder head or allow said intermediate member to be rotated about said central axis which allows removal of said intermediate member transversely of to said central axis from said support member and then allows extraction of said mandrel from said support member in the direction of the central axis.

9. The mandrel holder head according to claim 8 further comprising a locking member adapted to be removably fastened to said support member, so as to prevent release of said mandrel through said first lateral opening when fastened, and to allow extraction of said mandrel when unfastened.

10. The mandrel holder head according to claim 9 wherein said intermediate member comprises an end with a portion that is engageable for rotation of said intermediate member about its central axis into a predetermined operative condition to allow release of said intermediate member from said support member comprises a portion adapted to couple with a tool for applying a moment about the axis of the intermediate member.

11. The mandrel holder head according to claim 9 wherein said locking member comprises two separate parts circumferentially spaced apart from each other for engaging said intermediate member.

12. The mandrel holder head according to claim 8 wherein said first cavity and said second cavity, each having a U-shape in a section plane transverse to said central axis.

13. The mandrel holder head according to claim 12 , wherein the shape of the first cavity of the support member is complementary to the external surface of said intermediate member so as to create a shape coupling between said support and intermediate members, and to allow rotational movement of said intermediate member with respect to said support member to allow a release/fastening operation of said intermediate member with respect to said support member.

14. The mandrel holder head according to claim 8 operable with a lifting device having an externally threaded stem, said intermediate member having a threaded hole adapted to be engaged by said threaded stem for lifting said intermediate member to be lifted away from said support member by said lifting device.

15. A mandrel holder head adapted to releasably engage a mandrel used for rolling metallic tubes, where said mandrel has a first end part having an outer diameter, an opposite end part having an outer diameter, and an intermediate part having an outer diameter, said outer diameters of said first and opposite end parts being greater than the outer diameter of said intermediate part, said mandrel holder head comprising:
a. a support member provided with a cavity with a first lateral opening on a top surface of said support member, the cavity being adapted to accommodate a said first end of the mandrel, and
b. an intermediate member adapted to cooperate with said support member, said cavity of said support member being adapted to receive said intermediate member through a first longitudinal opening, said intermediate member and support member having a common central axis, said intermediate member having a second cavity with a second lateral opening oriented axially where said second lateral opening is adapted to engage said opposite end part of the mandrel, said support member a

Assignees

• Cernuschi Ettore
• Deplano Stefano
• Danieli Off Mecc

Inventors

• Cernuschi Ettore
• Deplano Stefano

Classifications

• B21B25/02 Primary

  Guides, supports, or abutments for mandrels, e.g. carriages {or steadiers}; Adjusting devices for mandrels · CPC title

• B21B25/06

  Interchanging mandrels {, fixing plugs on mandrel rods or cooling during interchanging mandrels (separating tubes from mandrels B21C45/00)} · CPC title