Upsetting method and upsetting apparatus

Abstract

An upsetting method capable of eliminating a correction step by preventing occurrence of quench distortion is provided. The method includes the step of preparing an upsetting apparatus 10 equipped with a forming die 11 and a guide 20 having an insertion hole 21 for securing a diameter expansion scheduled portion 2 of the bar-shaped raw material 1 in a buckling preventing state and a punch 30 . The diameter expansion scheduled portion 2 of the raw material 1 in a heated state is disposed in the insertion hole 21 of the guide 20 in a heated state, and the tip end portion of the guide 20 is disposed in the cavity 12 of the forming die 11 adjusted in temperature so as to be below a temperature of the raw material 1 , and the raw material is secured to the securing portion 13 of the forming die 11 . With this state, the guide 20 is moved in a direction opposite to a moving direction 37 of the punch 30 while axially pressurizing the diameter expansion scheduled portion 2 of the raw material 1 by moving the punch 30 , to thereby expand the diameter expansion scheduled portion 2 of the raw material 1 exposed between a tip end portion of the guide 20 and the securing portion 13 of the forming die 11 within the cavity 12 of the forming die 11.

1 . An upsetting method, comprising the steps of:
 preparing an upsetting apparatus including a forming die having a securing portion for securing a bar-shaped raw material and a cavity, a guide having an insertion hole for holding a diameter expansion scheduled portion of the raw material in a buckling preventing state, the insertion hole being penetrated and extended in an axial direction, and a punch;   disposing the diameter expansion scheduled portion of the raw material in a heated state in the insertion hole of the guide in a heated state;   disposing a tip end portion of the guide in the cavity of the forming die adjusted in temperature so as to be below temperature of the raw material;   securing the raw material to the securing portion of the forming die; and   while keeping the above state, moving the guide in a direction opposite to a moving direction of the punch while axially pressurizing the diameter expansion scheduled portion of the raw material by moving the punch, to thereby expand the diameter expansion scheduled portion of the raw material exposed between the tip end portion of the guide and the securing portion of the forming die within the cavity of the forming die.   
   
   
       2 . The upsetting method as recited in  claim 1 , wherein the diameter expansion scheduled portion of the raw material is placed in the insertion hole of the guide by inserting the raw material in a heated state into the insertion hole of the guide in a heated state from the insertion hole inlet portion formed at a rear end portion of the guide. 
   
   
       3 . The upsetting method as recited in  claim 1 , wherein the diameter expansion scheduled portion of the raw material is axially pressurized with the punch simultaneous with or immediately after the securing of the raw material to the securing portion of the forming die. 
   
   
       4 . The upsetting method as recited in  claim 1 ,
 wherein the securing portion of the forming die is provided with a raw material fixing insertion hole communicated with the cavity,   wherein the forming die has a plurality of divided members divided by the dividing plane vertically dividing insertion hole and the cavity, and   wherein the raw material is secured to the securing portion of the forming die by clamping a non-diameter-expansion scheduled portion of the raw material between divided grooves of the insertion holes of a plurality of divided members of the forming die.   
   
   
       5 . The upsetting method as recited in  claim 1 , wherein the raw material is heated to solution heat treatment temperature of the raw material. 
   
   
       6 . The upsetting method as recited in  claim 5 , wherein the raw material is made of heat-treatment type aluminum alloy, and wherein the raw material is heated to a temperature range of 400 to 570° C. 
   
   
       7 . The upsetting method as recited in  claim 6 , wherein the forming die is adjusted in temperature so as to fall within the temperature range of 5 to 120° C. 
   
   
       8 . The upsetting method as recited in  claim 6 , wherein the guide is heated to a temperature range of 170 to 500° C. 
   
   
       9 . The upsetting method as recited in  claim 1 ,
 wherein the raw material has a non-diameter-expansion scheduled portion as its axial intermediate portion and diameter expansion scheduled portions at its axial both end portions,   wherein the upsetting apparatus has two cavities in the forming die, two guides, and two punches,   wherein each diameter expansion scheduled portion of the raw material in a heated state is placed in the corresponding insertion hole of the guide in a heated state,   wherein the tip end portion of each guide is placed in the cavity of the forming die adjusted in temperature so as to be below the temperature of the raw material,   wherein the raw material is secured to the securing portion of the forming die, and   wherein, while keeping the aforementioned state, both the diameter expansion scheduled portions of the raw material are simultaneously expanded in diameter by moving each guide in a direction opposite to the moving direction of the corresponding punch while simultaneously axially pressurizing each diameter expansion scheduled portion of the raw material with the corresponding punch.   
   
   
       10 . An upsetting manufactured product obtained by the upsetting method as recited in any one of  claims 1  to  9 . 
   
   
       11 . A method of manufacturing an upsetting manufactured product, comprising the steps of:
 subjecting a raw material to the upsetting method as recited in any one of  claims 1  to  9 ; and thereafter   subjecting the raw material to aging treatment.   
   
   
       12 . An upsetting apparatus, comprising:
 a forming die having a securing portion for securing a bar-shaped raw material and a cavity;   a guide having an insertion hole for holding a diameter expansion scheduled portion of the raw material in a buckling preventing state, the inserting hole being penetrated and extended in an axial direction;   a punch for axial pressurizing the diameter expansion scheduled portion of the raw material placed in the insertion hole of the guide;   a guide driving apparatus for moving the guide in a direction opposite to a moving direction of the punch;   a raw material heating device for heating the raw material;   a forming die temperature adjusting device for adjusting the forming die so as to be a temperature below a heating temperature of the raw material by the raw material heating device; and   a guide heating device for heating the guide.   
   
   
       13 . The upsetting apparatus as recited in  claim 12 , further comprising a raw material insertion apparatus for inserting the raw material into the insertion hole of the guide from the insertion hole inlet portion formed at a rear end portion of the guide. 
   
   
       14 . The upsetting apparatus as recited in  claim 12 , wherein the securing portion of the forming die has a raw material fixing insertion hole communicated with the cavity, and wherein the forming die has a plurality of divided members divided by a dividing plane vertically dividing the insertion hole and the cavity, whereby the raw material is secured to the securing portion by clamping the non-diameter-expansion scheduled portion of the raw material between the divided grooves of the insertion hole of the plurality of divided members. 
   
   
       15 . The upsetting apparatus as recited in  claim 11 , wherein the raw material heating device is configured to heat the raw material to solution heat treatment temperature of the raw material. 
   
   
       16 . The upsetting apparatus as recited in  claim 15 , wherein the raw material is made of heat-treatment type aluminum alloy, and wherein the raw material heating device is configured to heat the raw material to a temperature range of 400 to 570° C. 
   
   
       17 . The upsetting apparatus as recited in  claim 16 , wherein the forming die temperature adjusting device is configured to adjust the forming die to a temperature range of 5 to 120° C. 
   
   
       18 . The upsetting apparatus as recited in  claim 16 , wherein the guide heating device is configured to heat the guide to a temperature range of 170 to 500° C. 
   
   
       19 . An upsetting apparatus for expanding axial both end portions of a bar-shaped raw material as diameter expansion scheduled portions, the raw material having an axial intermediate portion as a non-diameter-expansion scheduled portion, the apparatus comprising:
 a forming die having a securing portion for securing the raw material and two cavities;   two guides each having an insertion hole for holding each diameter expansion scheduled portion of the raw material secured to the securing portion of the forming die in a buckling preventing state, the insertion hole being penetrated through the guide and extended in an axial direction;   two punches each for axially pressurizing each diameter expansion scheduled portion of the raw material placed in the insertion hole of each guide;   two guide driving apparatus each for moving the corresponding guide in a direction opposite to a moving direction of the corresponding punch;   a raw material heating device configured to heat the raw material;   a forming die temperature adjusting device configured to adjust the forming die so as to be a temperature below the heating temperature of the raw material by the raw material heating device; and   two guide heating devices each configured to heat each guide.   
   
   
       20 . The upsetting apparatus as recited in  claim 19 , further comprising a raw material insertion apparatus for inserting the raw material into the insertion hole of one of guides from the insertion hole inlet portion formed at a rear end portion of the guide. 
   
   
       21 . The upsetting apparatus as recited in  claim 19 , wherein the securing portion of the forming die has a raw material fixing insertion hole communicated with the cavity, and wherein the forming die has a plurality of divided members divided by a dividing plane vertically dividing the insertion hole and both the cavities, whereby the raw material is secured to the securing portion by clamping the non-diameter-expansion scheduled portion of the raw material between the divided grooves of the insertion holes of the plurality of divided members. 
   
   
       22 . The upsetting apparatus as recited in  claim 19 , wherein the raw material heating device is configured to heat the raw material to solution heat treatment temperature of the raw material. 
   
   
       23 . The upsetting apparatus as recited in  claim 22 , wherein the raw material is made of heat-treatment type aluminum alloy, and wherein the raw material heating device is configured to heat the raw material to a temperature range of 400 to 570° C. 
   
   
       24 . The upsetting apparatus as recited in  claim 23 , wherein the forming die temperature adjusting device is configured to adjust the forming die to a temperature range of 5 to 120° C. 
   
   
       25 . The upsetting apparatus as recited in  claim 23 , wherein the guide heating device is configured to heat the guide to a temperature range of 170 to 500° C.