Upsetting method and upsetting apparatus

Abstract

An upsetting method capable of manufacturing an upsetting manufactured product having a bent expanded portion under a lighter load. A bar-shaped raw material 1 is loaded to the receiving die 11 in an axial movement prevented state, and the expansion scheduled portion 2 of the raw material 1 is arranged in the insertion hole 21 for holding the expansion scheduled portion 2 of the raw material 1 in a buckling prevented state. Subsequently, the guide 20 is moved in a direction opposite to a moving direction of the punch 30 while pressurizing the expansion scheduled portion 2 of the raw material 1 with the punch 30 in an axial direction, to thereby radially outwardly expand the expansion scheduled portion 2 of the raw material 1 exposed between a tip end portion of the guide 20 and the receiving die 11 . In this upsetting method, the expansion scheduled portion 2 is bent while expanding the expansion scheduled portion 2 of the raw material 1.

1 . An upsetting method, comprising the steps of: 
 attaching a bar-shaped raw material to a receiving die in an axial movement prevented state, and arranging an expansion scheduled portion of the raw material in an insertion hole formed in a guide for holding the expansion scheduled portion of the raw material in a buckling prevented state; and    then radially outwardly expanding the expansion scheduled portion of the raw material exposed between a tip end portion of the guide and the receiving die by moving the guide in a direction opposite to a moving direction of a punch while pressurizing the expansion scheduled portion of the raw material with the punch in an axial direction,    wherein the expansion scheduled portion is bent while expanding the expansion scheduled portion of the raw material.    
   
   
       2 . The upsetting method as recited in  claim 1 , wherein the expansion scheduled portion is bent in a state in which the expansion scheduled portion is supported by a supporting portion arranged at an expansion scheduled portion bending side with respect to the expansion scheduled portion of the raw material in a buckling prevented state.  
   
   
       3 . The upsetting method as recited in  claim 1  or  2 , wherein the expansion scheduled portion of the raw material is bent by pivotally moving at least one of the guide and the receiving die about a pivotal axis perpendicular to a plane including an axis of the raw material.  
   
   
       4 . An upsetting manufactured product obtained by the upsetting method as recited in  claim 1 .  
   
   
       5 . An upsetting method, comprising the steps of: 
 attaching an axial intermediate portion of a bar-shaped raw material to a receiving die in an axial movement prevented state, and arranging expansion scheduled portions of axial both end portions of the raw material in an insertion hole for holding the expansion scheduled portion of the raw material formed in a guide in a buckling prevented state, respectively; and then    simultaneously expanding both the expansion scheduled portions of the raw material exposed between a tip end portion of each guide and the receiving die radially outwardly, respectively, by moving each guide in a direction opposite to a moving direction of a corresponding punch while simultaneously pressurizing both the expansion scheduled portions of the raw material with the punch in an axial direction, respectively,    wherein at least one of both the expansion scheduled portions of the raw material is bent while simultaneously expanding both the expansion scheduled portions of the raw material, respectively.    
   
   
       6 . The upsetting method as recited in  claim 5 , wherein the expansion scheduled portion is bent in a state in which the expansion scheduled portion is supported by a supporting portion arranged at an expansion scheduled portion bending side with respect to the expansion scheduled portion of the raw material in a buckling prevented state.  
   
   
       7 . The upsetting method as recited in  claim 5  or  6 , wherein the expansion scheduled portion of the raw material is bent by pivotally moving the guide about a pivotal axis perpendicular to a plane including a raw material axis.  
   
   
       8 . An upsetting manufactured product obtained by the upsetting method as recited in  claim 5 .  
   
   
       9 . An upsetting apparatus, comprising: 
 a receiving die to which a bar-shaped raw material is attached in an axial movement prevented state;    a guide having an insertion hole for holding an expansion scheduled portion of the raw material in a buckling prevented state;    a punch for pressurizing the expansion scheduled portion of the raw material arranged in the insertion hole of the guide in an axial direction; and    a guide driving device for moving the guide in a direction opposite to a moving direction of the punch,    wherein the upsetting apparatus is configured to radially outwardly expand the expansion scheduled portion of the raw material exposed between a tip end portion of the guide and the receiving die, and    wherein a bending device for bending the expansion scheduled portion of the raw material is provided.    
   
   
       10 . The upsetting apparatus as recited in  claim 9 , wherein the upsetting apparatus is configured to bend the expansion scheduled portion of the raw material by the bending device while expanding the expansion scheduled portion of the raw material.  
   
   
       11 . The upsetting apparatus as recited in  claim 9  or  10 , further comprising a supporting portion arranged at a bending side of the expansion scheduled portion of the raw material with respect to the expansion scheduled portion to support the expansion scheduled portion in a buckling prevented state.  
   
   
       12 . The upsetting apparatus as recited in  claim 9 , wherein the bending device is configured to bend the expansion scheduled portion of the raw material by pivotally moving at least one of the guide and the receiving die about a pivotal axis perpendicular to a plane including a raw material axis.  
   
   
       13 . The upsetting apparatus as recited in  claim 12 , further comprising a change mechanism for changing a position of the pivotal axis.  
   
   
       14 . An upsetting apparatus, comprising: 
 a receiving die to which a bar-shaped raw material is attached in an axial movement prevented state;    two guides each having an insertion hole for holding each of axial both end expansion scheduled portions of the raw material in a buckling prevented state;    two punches each for pressurizing each expansion scheduled portion of the raw material arranged in the insertion hole of each guide in an axial direction; and    two guide driving devices each for moving each guide in a direction opposite to a moving direction of the corresponding punch,    wherein the upsetting apparatus is configured to radially outwardly expand both the expansion scheduled portions of the raw material each exposed between a tip end portion of the guide and the receiving die, and    wherein a bending device for bending at least one of the expansion scheduled portions of the raw material is provided.    
   
   
       15 . The upsetting apparatus as recited in  claim 14 , wherein the upsetting apparatus is configured to bend the expansion scheduled portion of the raw material by the bending device while expanding the expansion scheduled portion of the raw material.  
   
   
       16 . The upsetting apparatus as recited in  claim 14  or  15 , further comprising a supporting portion arranged at a bending side of the expansion scheduled portion of the raw material with respect to the expansion scheduled portion to support the expansion scheduled portion in a buckling prevented state.  
   
   
       17 . The upsetting apparatus as recited in  claim 14 , wherein the bending device is configured to bend the expansion scheduled portion of the raw material by pivotally moving the guide about a pivotal axis perpendicular to a plane including a raw material axis.  
   
   
       18 . The upsetting apparatus as recited in  claim 17 , further comprising a changing mechanism for changing a position of the pivotal axis.  
   
   
       19 . An upsetting method, comprising: 
 a step of preparing an upsetting apparatus equipped with a receiving die having a receiving face and a holding hole for holding a non-expansion scheduled portion of a bar-shaped raw material in a buckling prevented state formed at the receiving face, a guide having an insertion hole for holding an expansion scheduled portion of the raw material in a buckling prevented state, and a punch, wherein an expansion preventing protruded portion integrally protruded at a tip end portion of the guide in an axial direction of the guide;    a step of arranging the expansion scheduled portion of the raw material in the insertion hole of the guide with the non-expansion scheduled portion held in the holding hole of the receiving die;    a step of radially outwardly expanding the expansion scheduled portion of the raw material exposed between a tip end portion of the guide and the receiving face of the receiving die in a state in which an expansion of a contacting portion of at least one of thickness side surfaces of the expansion scheduled portions in contact with the guide protruded portion is controlled by moving the guide in a direction opposite to a moving direction of the punch while pressurizing the expansion scheduled portion of the raw material with the punch in an axial direction after the step of arranging the expansion scheduled portion of the raw material; and    a step of bending the expansion scheduled portion of the raw material in its width direction while expanding the expansion scheduled portion of the raw material expand at the expansion step.    
   
   
       20 . The upsetting method as recited in  claim 19 , wherein an expansion preventing side wall portion is provided at the receiving face of the receiving die in a protruded manner, and wherein at the expansion step, the expansion scheduled portion of the raw material is expanded radially outwardly in a state in which an expansion of a contacting portion of at least one of thickness side surfaces of the expansion scheduled portion in contact with the guide protruded portion is controlled and also in a state in which a contacting portion of at least one of thickness side surfaces of the expansion scheduled portion in contact with the receiving die side wall portion is controlled.  
   
   
       21 . The upsetting method as recited in  claim 20 , wherein the receiving die side wall portion is protruded from the receiving face of the receiving die at each of thickness side surfaces of the expansion scheduled portion of the raw material.  
   
   
       22 . The upsetting method as recited in  claim 19 , wherein the protruded portion of the guide is integrally provided at each of portions of a tip end portion of the guide opposed across the insertion hole.  
   
   
       23 . The upsetting method as recited in  claim 19 , wherein the receiving face of the receiving die is formed into a forming face for forming at least a portion of at least one side surface among widthwise side surfaces of the expansion scheduled portion of the raw material.  
   
   
       24 . The upsetting method as recited in  claim 19 , wherein at the bending step, the expansion scheduled portion of the raw material is bent in its widthwise direction by pivotally moving at least one of the guide and the receiving die about a pivotal axis parallel to a thickness direction of the expansion scheduled portion of the raw material.  
   
   
       25 . The upsetting method as recited in  claim 24 , wherein the tip end portion of the protruded portion of the guide is formed into an circular-arc-shape forwardly protruded along the widthwise direction of the expansion scheduled portion of the raw material.  
   
   
       26 . The upsetting method as recited in  claim 19 , wherein at the bending step, the expansion scheduled portion of the raw material is bent in its widthwise direction in a state in which the expansion scheduled portion is supported by a supporting portion arranged at an expansion scheduled portion bending side with respect to the expansion scheduled portion of the raw material in a buckling prevented state.  
   
   
       27 . An upsetting manufactured product obtained by the upsetting method as recited in  claim 19 .  
   
   
       28 . An upsetting method 
 a step of preparing an upsetting apparatus equipped with a receiving die having receiving faces at both axial end portions and a holding hole for holding a non-expansion scheduled portion of an axial central portion of a bar-shaped raw material in a buckling prevented state formed so as to communicate both the receiving faces, two guides each having an insertion hole for holding an expansion scheduled portion of the raw material in a buckling prevented state, and two punches, wherein an expansion preventing protruded portion is protruded from a tip end portion of at least one of the guides in an axial direction thereof;    a step of arranging both the expansion scheduled portions of the raw material in a respective insertion hole of the guide with the non-expansion scheduled portion held in the holding hole of the receiving die;    a step of radially outwardly expanding the expansion scheduled portion of the raw material exposed between a tip end portion of each guide and the receiving face of the receiving die in a state in which an expansion of a contacting portion of at least one of thickness side surfaces of the expansion scheduled portions in contact with the guide protruded portion is controlled by moving each guide in a direction opposite to a moving direction of the corresponding punch while pressurizing both the expansion scheduled portions of the raw material with the punches in an axial direction after the step of arranging the expansion scheduled portion of the raw material; and    a step of bending at least one of the expansion scheduled portions in its width direction while expanding both the expansion scheduled portions of the raw material in the expansion step.    
   
   
       29 . The upsetting method as recited in  claim 28 , wherein an expansion preventing side wall portion is provided at least one of the receiving faces of the receiving die in a protruded manner, and 
 wherein at the expansion step, both the expansion scheduled portions of the raw material are simultaneously expanded radially outwardly in a state in which an expansion of a contacting portion of at least one of thickness side surfaces of the expansion scheduled portion in contact with the guide protruded portion is controlled and also in a state in which a contacting portion of at least one of thickness side surfaces of the expansion scheduled portion in contact with the receiving die side wall portion is controlled.    
   
   
       30 . The upsetting method as recited in  claim 29 , wherein the receiving die side wall portion is protruded from the receiving face of the receiving die at each of thickness side surfaces of the expansion scheduled portion of the raw material.  
   
   
       31 . The upsetting method as recited in  claim 28 , wherein the protruded portion of the guide is integrally provided at each of portions of a tip end portion of the guide opposed across the insertion hole.  
   
   
       32 . The upsetting method as recited in  claim 28 , wherein at least one of the receiving faces of the receiving die is formed into a forming face for forming at least a portion of at least one side among widthwise side surfaces of the expansion scheduled portion of the raw material.  
   
   
       33 . The upsetting method as recited in  claim 28 , wherein at the bending step, the expansion scheduled portion of the raw material is bent in its widthwise direction by pivotally moving the guide about a pivotal axis parallel to a thickness direction of the expansion scheduled portion of the raw material.  
   
   
       34 . The upsetting method as recited in  claim 33 , wherein the tip end portion of the protruded portion of the guide is formed into an circular-arc-shape forwardly protruded along the widthwise direction of the expansion scheduled portion of the raw material.  
   
   
       35 . The upsetting method as recited in  claim 28 , wherein at the bending step, the expansion scheduled portion of the raw material is bent in its widthwise direction in a state in which the expansion scheduled portion is supported by a supporting portion arranged at an expansion scheduled portion bending side with respect to the expansion scheduled portion of the raw material in a buckling prevented state.  
   
   
       36 . An upsetting manufactured product obtained by the upsetting method as recited in  claim 28 .  
   
   
       37 . An upsetting apparatus, comprising: 
 a receiving die having a receiving face and a holding hole for holding a non-expansion scheduled portion of a bar-shaped raw material in a buckling prevented state formed at the receiving face;    a guide having an insertion hole for holding an expansion scheduled portion of the raw material in a buckling prevented state;    a punch for pressurizing the expansion scheduled portion of the raw material arranged in the insertion hole of the guide in an axial direction; and    a guide driving device for moving the guide in a direction opposite to a moving direction of the punch,    wherein the upsetting apparatus is configured to radially outwardly expand the expansion scheduled portion of the raw material exposed between a tip end portion of the guide and the receiving face of the receiving die,    wherein an expansion preventing protruded portion protruded in an axial direction of the guide is integrally provided at the tip end portion of the guide,    wherein the protruded portion of the guide is configured to control an expansion of a contacting portion of the expansion scheduled portion by a contact with at least one of thickness side surfaces of the expansion scheduled portion at the time of expanding the expansion scheduled portion of the raw material, and    wherein the upsetting apparatus further comprises a bending device for bending the expansion scheduled portion of the raw material in its width direction.    
   
   
       38 . The upsetting apparatus as recited in  claim 37 , wherein the bending device is configured to bend the expansion scheduled portion of the raw material in its width direction at the time of expanding the expansion scheduled portion of the raw material.  
   
   
       39 . The upsetting apparatus as recited in  claim 37 , wherein an expansion preventing side wall portion is provided at the receiving face of the receiving die in a protruded manner, and 
 wherein the side wall portion of the receiving die controls expansion of a contacting portion of the expansion scheduled portion by a contact with at least one side surfaces among thickness side surfaces of the expansion scheduled portion at the time of expanding the expansion scheduled portion of the raw material.    
   
   
       40 . The upsetting apparatus as recited in  claim 39 , wherein the receiving die side wall portion is protruded from the receiving face of the receiving die at each of thickness side surfaces of the expansion scheduled portion of the raw material.  
   
   
       41 . The upsetting apparatus as recited in  claim 37 , wherein the protruded portion of the guide is integrally provided at each of portions of a tip end portion of the guide opposed across the insertion hole.  
   
   
       42 . The upsetting apparatus as recited in  claim 37 , wherein the receiving face of the receiving die is formed into a forming face for forming at least a portion of at least one side surface among widthwise side surfaces of the expansion scheduled portion of the raw material.  
   
   
       43 . The upsetting apparatus as recited in  claim 37 , wherein the bending device is configured to bend the expansion scheduled portion of the raw material in its widthwise direction by pivotally moving at least one of the guide and the receiving die about a pivotal axis parallel to a thickness direction of the expansion scheduled portion of the raw material.  
   
   
       44 . The upsetting apparatus as recited in  claim 43 , wherein the tip end portion of the protruded portion of the guide is formed into an circular-arc-shape forwardly protruded along the widthwise direction of the expansion scheduled portion of the raw material.  
   
   
       45 . The upsetting apparatus as recited in  claim 43 , further comprising a change mechanism for changing a position of the pivotal axis.  
   
   
       46 . The upsetting apparatus as recited in  claim 37 , further comprising a supporting portion arranged at a bending side of the expansion scheduled portion with respect to the expansion scheduled portion of the raw material to support the expansion scheduled portion in a buckling prevented state.  
   
   
       47 . An upsetting apparatus, comprising: 
 a receiving die having receiving faces at axial both end portions and a holding hole for holding a non-expansion scheduled portion of a bar-shaped raw material in a buckling prevented state formed so as to communicate both the receiving faces;    two guides each having an insertion hole for holding an expansion scheduled portion of the raw material in a buckling prevented state;    two punches each for pressurizing the expansion scheduled portion of the raw material arranged in the insertion hole of each guide in an axial direction; and    two guide driving devices each for moving each guide in a direction opposite to a moving direction of the corresponding punch,    wherein the upsetting apparatus is configured to radially outwardly expand both the expansion scheduled portions of the raw material exposed between a tip end portion of each guide and the corresponding receiving face of the receiving die,    wherein an expansion preventing protruded portion protruded in an axial direction of the guide is provided at the tip end portion of at least one of the guides,    wherein the protruded portion of the guide is configured to control an expansion of a contacting portion of the expansion scheduled portion by a contact with at least one of thickness side surfaces of the expansion scheduled portion at the time of expanding the expansion scheduled portion of the raw material, and    wherein the upsetting apparatus further comprises a bending device for bending at least one of the expansion scheduled portions of the raw material in a width direction.    
   
   
       48 . The upsetting apparatus as recited in  claim 47 , wherein the bending device is configured to bend the expansion scheduled portion of the raw material in its width direction at the time of expanding the expansion scheduled portion of the raw material.  
   
   
       49 . The upsetting apparatus as recited in  claim 47 , wherein expansion preventing side wall portion is provided at least one of the receiving faces of the receiving die in a protruded manner, and 
 wherein the side wall portion of the receiving die controls an expansion of a contacting portion of the expansion scheduled portion by a contact with at least one side surfaces among thickness side surfaces of the expansion scheduled portion at the time of expanding the expansion scheduled portion of the raw material.    
   
   
       50 . The upsetting apparatus as recited in  claim 49 , wherein the receiving die side wall portion is protruded from the receiving face of the receiving die at each of thickness side surfaces of the expansion scheduled portion of the raw material.  
   
   
       51 . The upsetting apparatus as recited in  claim 47 , wherein the protruded portions of the guide is integrally provided at each of portions of a tip end portion of the guide opposed across the insertion hole.  
   
   
       52 . The upsetting apparatus as recited in  claim 47 , wherein at least one of the receiving faces of the receiving die is formed into a forming face for forming at least a portion of at least one side surface among width wise side surfaces of the expansion scheduled portion of the raw material into a predetermined shape.  
   
   
       53 . The upsetting apparatus as recited in  claim 47 , wherein the bending device is configured to bend the expansion scheduled portion of the raw material in its widthwise direction by pivotally moving the guide about a pivotal axis parallel to a thickness direction of the expansion scheduled portion of the raw material.  
   
   
       54 . The upsetting apparatus as recited in  claim 53 , wherein the tip end portion of the protruded portion of the guide is formed into an circular-arc-shape forwardly protruded along the widthwise direction of the expansion scheduled portion of the raw material.  
   
   
       55 . The upsetting apparatus as recited in  claim 53 , further comprising a change mechanism for changing a position of the pivotal axis.  
   
   
       56 . The upsetting apparatus as recited in  claim 47 , further comprising a supporting portion arranged at a bending side of the expansion scheduled portion with respect to the expansion scheduled portion of the raw material to support the expansion scheduled portion in a buckling prevented state.