Forging device and re-centering attachment of forging device

Abstract

Disclosed is a forging device containing a die insert 1, a stationary die case 2, a movable part (Ram) 3, a punch holder 4, and a punch tool 5. The punch holder 4 contains upper and lower reference stud holes 14,15, upper and lower reference studs 7,8 loosely fitted in the respective holes 14,15 in the movable part 3, an alignment adjusting bolt 17T, etc. to be tightened into a direction of the stud 7 to move the punch holder 4 in an alignment direction, and clamping nuts 9 engaged with the respective studs 7,8, to fix the punch holder 4. A positioning nut 22T is received by a male screw portion 21 of at least one alignment transcription bolt 20T and fixed thereto, and the nut 22 is brought into contact with the punch holder 4 at a complete alignment position, whereby the bolt 20T and the punch tool 5 should be attached/detached as a pair.

1 . A forging device comprising:
 a stationary part comprising a die,   a movable part reciprocally movable to and away from the stationary part in a moving direction,   a punch holder detachably attached to the movable part, and   a punch tool that is paired with the die and is detachably attached to the punch holder;   the punch holder comprising:   an upper reference stud hole drilled through the punch holder with an axis of the upper reference stud hole along the moving direction of the movable part,   a lower reference stud hole drilled through the punch holder with an axis of the lower reference stud hole along the moving direction of the movable part in an opposing side of the upper reference stud hole across the punch tool,   an upper reference stud fixed to the movable part such that the upper reference stud is loosely fitted in the upper reference stud hole of the punch holder,   a lower reference stud fixed to the movable part such that the lower reference stud is loosely fitted in the lower reference stud hole of the punch holder, wherein either the upper reference stud or each of the upper and lower reference studs is defined as a reference stud, and either the upper reference stud hole or the lower reference stud hole in which the reference stud is loosely fitted is defined as a reference stud hole,   a plurality of adjusting bolts each comprising a male screw portion, the adjusting bolts to be tightened with respect to the reference stud from an outer side of the punch holder into a direction of the reference stud to move the punch holder into an alignment direction, defined as a direction in which the punch holder is moved to align the punch tool and the die, with fixing the punch holder at a position of the reference stud,   clamping nuts which are engaged with the upper reference stud and the lower reference stud, respectively, and fix the punch holder at a complete alignment position, defined as a position at which the punch tool and the die are aligned, and   a positioning nut which is received by at least one of the adjusting bolts in movable engagement therewith,   wherein the positioning nut can be non-rotatably fixed to the male screw portion of the adjusting bolts with the positioning nut put in contact with an outer surface of the punch holder set at the complete alignment position, whereby the positioning nut is fixed on the adjusting bolt in association with the complete alignment position,   wherein the adjusting bolt on which the positioning nut is fixed and the punch tool in the punch holder are attached to and detached from the punch holder in pairs.   
     
     
         2 . The forging device according to  claim 1 , wherein the adjusting bolts comprise:
 a first group of adjusting bolts used for a normal alignment adjusting operation, defined as an operation in which information on a formerly performed alignment adjusting operation is not used, and;   a second group of adjusting bolts used for an alignment transcription operation, defined as an operation in which the punch tool and the die are aligned at the same position with a formerly aligned position,   wherein the first group of adjusting bolts and the second group of adjusting bolts are displaced from one another and the second group of adjusting bolts receive the positioning nuts.   
     
     
         3 . The forging device according to  claim 1 , wherein the adjusting bolt receiving the positioning nut is a headless screw with a recess at an axial end thereof for engagement with a fastening tool. 
     
     
         4 . The forging device according to  claim 1  comprises an alignment transcription attachment comprising:
 a thick-plate shaped block body that is set in contact with a surface of the punch holder on a side facing the stationary part, 
 an extended bolt hole drilled in the block body to communicate with the reference stud hole, and 
 the adjusting bolts used in a alignment transcription operation and to be tightened from an outer side of the punch holder into a direction of the reference stud, wherein the alignment transcription operation is defined as an operation in which the punch tool and the die are aligned at the same position with a formerly aligned position, and the alignment transcription attachment is coupled to the punch holder with the extended bolt hole communicating with the reference stud hole. 
 
     
     
         5 . The forging device according to  claim 2 , wherein the second group of adjusting bolts receiving the positioning nuts are each headless screw like hexagon socket set screw with a recess at an axial end thereof for engagement with a fastening tool. 
     
     
         6 . The forging device according to  claim 5  comprises an alignment transcription attachment comprising:
 a thick-plate shaped block body that is set in contact with a surface of the punch holder on a side facing the stationary part, 
 an extended bolt hole drilled in the block body to communicate with the reference stud hole of the punch holder, and 
 the second group of adjusting bolts used in the alignment transcription operation and to be tightened from an outer side of the punch holder into a direction of the reference stud, wherein the alignment transcription attachment is coupled to the punch holder with the extended bolt hole communicating with the reference stud hole. 
 
     
     
         7 . An alignment transcription attachment to be coupled to a forging device, the forging device comprising:
 a stationary part comprising a die,   a movable part reciprocally movable to and away from the stationary part in a moving direction,   a punch holder detachably attached to the movable part, and   a punch tool that is paired with the die and is detachably attached to the punch holder;   the punch holder comprising:   an upper reference stud hole drilled through the punch holder with an axis of the upper reference stud hole along the moving direction of the movable part,   a lower reference stud hole drilled through the punch holder with an axis of the lower reference stud hole along the moving direction of the movable part in an opposing side of the upper reference stud hole across the punch tool,   an upper reference stud fixed to the movable part such that the upper reference stud is loosely fitted in the upper reference stud hole of the punch holder,   a lower reference stud fixed to the movable part such that the lower reference stud is loosely fitted in the lower reference stud hole of the punch holder, wherein either the upper reference stud or each of the upper and lower reference studs is defined as a reference stud, and either the upper reference stud hole or the lower reference stud hole in which the reference stud is loosely fitted is defined as a reference stud hole,   a plurality of adjusting bolts each comprising a male screw portion, the adjusting bolts to be tightened with respect to the reference stud from an outside of the punch holder into a direction of the reference stud to move the punch holder into an alignment direction, defined as a direction in which the punch holder is moved to align the punch tool and the die, with fixing the punch holder at a position of the reference stud, and   clamping nuts which are engaged with the upper reference stud and the lower reference stud, respectively, and fix the punch holder at a complete alignment position, defined as a position at which the punch tool and the die are aligned,   the alignment transcription attachment comprising:   a substantially thick-plate shaped block body that is set in contact with a surface of the punch holder at a portion covering the upper reference stud hole on a side facing the stationary part,   an extended bolt hole drilled though the block body to communicate with the reference stud hole of the punch holder,   an adjusting bolt tightened into a direction of the extended bolt hole from the outer side of the punch holder to be in contact with the reference stud, and   a positioning nut movably engaged with the male screw portion of the adjusting bolt, wherein   the block body is coupled or bolted to the punch holder with the extended bolt hole communicating with the reference stud hole, the adjusting bolt of the block body is tightened till the bolt hits the reference stud in alignment, the positioning nut is tightened till the positioning nut hits the block body, and the tightened positioning nut is un-rotatably fixed to the male screw portion of the adjusting bolt.