Hot forging mold device for low-pressure casting

Abstract

The hot forging mold device for low-pressure casting includes an upper and lower mold forming a cavity, a riser cavity that supplies molten metal, and a press device positioned above the riser cavity to apply pressure. A sensor and controller can adjust pressure based on the molten metal's temperature or fill level. Cooling fluid circulates through a cylinder base plate, and an insulating plate reduces heat transfer. An ejection device, moved by an actuator, removes the solidified cast product. Guide blocks help align components, and a leakage preventing plate with a seal helps avoid fluid intrusion. The overall design ensures efficient feeding of molten metal, controlled forging pressure, and reliable ejection, improving casting quality and reducing defects.

What is claimed is: 
     
         1 . A hot forging mold device for low-pressure casting, comprising:
 a mold body comprising an upper mold and a lower mold;   a mold cavity formed in the mold body;   a riser cavity configured to store molten metal to for filling the mold cavity; and   a press device provided on an upper side of the riser cavity and configured to provide pressure to the molten metal in the riser cavity.   
     
     
         2 . The hot forging mold device of  claim 1 , further comprising:
 a riser runner connecting the mold cavity and the riser cavity.   
     
     
         3 . The hot forging mold device of  claim 1 , wherein a transverse cross section of the riser cavity has a tapered shape, an upper side of which is narrower and a lower side of which is wider. 
     
     
         4 . The hot forging mold device of  claim 1 , wherein the press device comprises:
 a press plunger;   a hydraulic cylinder configured to provide an operation force to the press plunger; and   a cylinder base plate supporting the hydraulic cylinder, and in which a cooling fluid circulates along an inner path.   
     
     
         5 . The hot forging mold device of  claim 4 , wherein the press device further comprises:
 an insulating plate installed on a lower side of the cylinder base plate.   
     
     
         6 . The hot forging mold device of  claim 4 , wherein the press device further comprises:
 a leakage preventing plate installed on an upper side of the riser cavity and installed at a circumference of the press plunger.   
     
     
         7 . The hot forging mold device of  claim 6 , wherein a through-hole, through which the press plunger passes, is formed in the leakage preventing plate, and
 wherein a sealing part is formed in the through-hole.   
     
     
         8 . The hot forging mold device of  claim 5 , further comprising:
 an ejection device installed at a lower end of the cylinder base plate, and configured to separate a finished cast product from the mold cavity,   wherein the ejection device comprises:
 an ejection plate installed between the cylinder base plate and the upper mold, and configured to move forward or rearward with respect to the upper mold along a movement direction of the upper mold; and 
 an ejection pin, to which one side of the ejection plate is fixed, a portion of an opposite side of which is inserted into the upper mold and configured to separate the cast product formed in the mold cavity from the upper mold by pushing the cast product. 
   
     
     
         9 . The hot forging mold device of  claim 8 , wherein a first guide block configured to guide a press plunger linearly moving while passing through the ejection plate is provided in the ejection plate. 
     
     
         10 . The hot forging mold device of  claim 8 , wherein a through-hole, through which the press plunger passes, is formed in the upper mold, and
 wherein a second guide block configured to guide the press plunger is formed in the through-hole.   
     
     
         11 . A hot forging mold device for low-pressure casting, comprising:
 a mold body including an upper mold and a lower mold;   a mold cavity formed in the mold body;   a riser cavity configured to store molten metal to be filled in the mold cavity;   a press device disposed above the riser cavity and configured to apply pressure to molten metal in the riser cavity;   a sensor configured to detect at least one condition of the molten metal in the riser cavity; and   a controller in communication with the sensor and configured to actuate the press device based on the detected condition.   
     
     
         12 . The hot forging mold device of  claim 11 , wherein the sensor is a temperature sensor arranged to measure a temperature of the molten metal in the riser cavity, and the controller is configured to initiate pressure application by the press device when the temperature exceeds a predetermined threshold. 
     
     
         13 . The hot forging mold device of  claim 11 , wherein the sensor is a fill-level sensor arranged to measure how full the riser cavity is with molten metal, and the controller is configured to actuate the press device when the fill level exceeds a predetermined setpoint. 
     
     
         14 . The hot forging mold device of  claim 11 , wherein the press device further comprises a pressure regulator configured to maintain a selected forging pressure for a predetermined dwell time. 
     
     
         15 . The hot forging mold device of  claim 14 , wherein the controller is configured to terminate the forging pressure after determining that the molten metal in the mold cavity has solidified to at least a selected degree, as indicated by data from the sensor. 
     
     
         16 . A hot forging mold device for low-pressure casting, comprising:
 a mold body including an upper mold and a lower mold;   a mold cavity formed in the mold body;   a riser cavity configured to store molten metal to be filled in the mold cavity;   a press device disposed above the riser cavity and configured to apply pressure to molten metal in the riser cavity;   an ejection device configured to separate a formed cast product from the mold cavity; and   an actuator configured to automatically move the ejection device in response to a control signal.   
     
     
         17 . The hot forging mold device of  claim 16 , wherein the ejection device comprises:
 an ejection plate movably disposed between the upper mold and a cylinder base plate of the press device; and   a plurality of ejection pins coupled to the ejection plate and configured to push the cast product away from the upper mold when the ejection plate is moved by the actuator.   
     
     
         18 . The hot forging mold device of  claim 16 , further comprising a controller configured to send the control signal to the actuator after a predetermined interval has elapsed from the time the press device applies pressure to the molten metal. 
     
     
         19 . The hot forging mold device of  claim 16 , wherein the actuator is a hydraulic or pneumatic cylinder configured to move the ejection device between an extended position and a retracted position relative to the upper mold. 
     
     
         20 . The hot forging mold device of  claim 16 , further comprising a safety sensor configured to detect whether the cast product has fully disengaged from the mold cavity, the safety sensor being in communication with the actuator to prevent reclosure of the upper mold unless disengagement is confirmed.