Milling headstock for rivet stems
A milling headstock for rivet stems includes a mouth for the introduction of the stem. A milling machine can be displaced towards the mouth by a previously established length, in order to trim the stem of the different rivets made in a piece. The mouth has a dimension equal to or less than the head of the rivet so that, after introducing the stem via the mouth, the latter at all times rests on the surface of the head of that rivet in such manner that the milling machine is then displaced through the previously established length.
1 . MILLING HEADSTOCK FOR RIVET STEMS, comprising a mouth ( 4 ) for the introduction of the surplus stem ( 5 ) of a rivet ( 6 ), and in front of which it includes a milling machine ( 3 ) that can be displaced a previously established length towards the mouth ( 4 ), in order to trim the stem ( 5 ) of the different rivets ( 6 ) made in a piece; characterised in that the mouth ( 4 ) has a dimension selected between a dimension equal to the dimension of the surface ( 6 a ) of the head of the rivet ( 6 ) and a dimension less than the dimension of the surface ( 6 a ) of the head of the rivet ( 6 ), so that the mouth ( 4 ) rests on the surface ( 6 a ) of said head of the rivet ( 6 ) and at all times the same amount of stem ( 5 ) is left in each rivet made, being kept within the established margins of tolerance independently of the depth at which each rivet ( 6 ) is fixed in the piece.
2 . MILLING HEADSTOCK FOR RIVET STEMS, according to claim 1 , characterised in that the milling machine ( 3 ) is arranged in a fixed position inside the headstock, and the mouth ( 4 ) is arranged in an external casing ( 1 ) that can be displaced with respect to the milling machine ( 3 ) and assisted by at least one spring, so that, when the mouth ( 4 ) presses on the surface of the rivet ( 6 ), overcoming the action of at least one spring, the casing ( 1 ) is displaced with respect to the milling machine ( 3 ) causing the latter to advance.
3 . MILLING HEADSTOCK FOR RIVET STEMS, according claim 1 , characterised in that the headstock is mounted on a robot provided with means of positioning the headstock facing the surface ( 6 a ) of the head of the rivet ( 6 ), and means of advance so that it presses against said surface ( 6 a ) of the head of the rivet ( 6 ).
4 . MILLING HEADSTOCK FOR RIVET STEMS, according to claim 1 , characterised in that the milling machine ( 3 ) is arranged in a support ( 8 ) provided with at least one micro-switch ( 9 ) which, when it makes contact with a limit ( 10 ) of the casing ( 1 ), is detected by the robot performing the withdrawal of the headstock and locating the casing ( 1 ) in its initial position due to the action of the spring.
5 . MILLING HEADSTOCK FOR RIVET STEMS, according to claim 4 , characterised in that the relative position of the limit ( 10 ) with respect to at least one micro-switch ( 9 ) is adjustable according to the length of the surplus stem ( 5 ).
6 . MILLING HEADSTOCK FOR RIVET STEMS, according to claim 2 , characterised in that the headstock is mounted on a robot provided with means of positioning the headstock facing the surface ( 6 a ) of the head of the rivet ( 6 ), and means of advance so that it presses against said surface ( 6 a ) of the head of the rivet ( 6 ).
7 . MILLING HEADSTOCK FOR RIVET STEMS, according to claim 3 , characterised in that the milling machine ( 3 ) is arranged in a support ( 8 ) provided with at least one micro-switch ( 9 ) which, when it makes contact with a limit ( 10 ) of the casing ( 1 ), is detected by the robot performing the withdrawal of the headstock and locating the casing ( 1 ) in its initial position due to the action of the spring.