Casting mold making system

Abstract

In a casting mold making system for blowing and packing casting sand accommodated in a receiver of a blow head into a cavity in molding dies by feeding pressurized gas into the receiver, the pressure of pressurized gas to be fed into the receiver is discontinuously raised at least once in the course of feeding of pressurized gas into the receiver.

1 . A casting mold making system including a blow head having a receiver for accommodating casting sand and a blow nozzle communicating with the receiver and a pressurized gas feed system for feeding pressurized gas into the receiver of the blow head and configured to feed pressurized gas into the receiver through the pressurized gas feed system and thereby blow the casting sand in the receiver through the blow nozzle into a cavity in molding dies and pack the casting sand into the cavity,
 wherein the pressurized gas feed system is configured to discontinuously raise the pressure of pressurized gas to be fed into the receiver at least once in the course of feeding of pressurized gas into the receiver.   
   
   
       2 . The casting mold making system of  claim 1 , wherein the pressurized gas feed system is configured to discontinuously raise the pressure of pressurized gas to be fed into the receiver from a low pressure to a high pressure once in the course of feeding of pressurized gas into the receiver. 
   
   
       3 . The casting mold making system of  claim 2 , wherein the pressurized gas feed system comprises: a low-pressure tank for storing low-pressure pressurized gas; a high-pressure tank for storing high-pressure pressurized gas; and a feeding device for first feeding the low-pressure pressurized gas in the low-pressure tank into the receiver and then feeding the high-pressure pressurized gas into the receiver. 
   
   
       4 . The casting mold making system of  claim 2 , wherein the pressurized gas feed system further comprises a pressure changing device for individually changing the pressure levels of the low and high pressures. 
   
   
       5 . The casting mold making system of  claim 3 , wherein the pressurized gas feed system further comprises a pressure changing device for individually changing the pressure levels of the low and high pressures. 
   
   
       6 . The casting mold making system of  claim 4 , further comprising
 a casting sand amount detection device for detecting the amount of casting sand in the receiver,   wherein the pressure changing device is configured to individually change the pressure levels of the low and high pressures based on the amount of casting sand detected by the casting sand amount detection device.   
   
   
       7 . The casting mold making system of  claim 5 , further comprising
 a casting sand amount detection device for detecting the amount of casting sand in the receiver,   wherein the pressure changing device is configured to individually change the pressure levels of the low and high pressures based on the amount of casting sand detected by the casting sand amount detection device.   
   
   
       8 . The casting mold making system of  claim 4 , further comprising:
 a stirrer for stirring the casting sand in the receiver;   a stirrer drive unit for driving the stirrer; and   a stirring resistance detection device for detecting the stirring resistance of the stirrer,   wherein the pressure changing device is configured to individually change the pressure levels of the low and high pressures based on the stirring resistance detected by the stirring resistance detection device.   
   
   
       9 . The casting mold making system of  claim 5 , further comprising:
 a stirrer for stirring the casting sand in the receiver;   a stirrer drive unit for driving the stirrer; and   a stirring resistance detection device for detecting the stirring resistance of the stirrer,   wherein the pressure changing device is configured to individually change the pressure levels of the low and high pressures based on the stirring resistance detected by the stirring resistance detection device.   
   
   
       10 . The casting mold making system of  claim 4 , further comprising:
 a casting sand amount detection device for detecting the amount of casting sand in the receiver;   a stirrer for stirring the casting sand in the receiver;   a stirrer drive unit for driving the stirrer; and   a stirring resistance detection device for detecting the stirring resistance of the stirrer,   wherein the pressure changing device is configured to individually change the pressure levels of the low and high pressures based on the amount of casting sand detected by the casting sand amount detection device and the stirring resistance detected by the stirring resistance detection device.   
   
   
       11 . The casting mold making system of  claim 5 , further comprising:
 a casting sand amount detection device for detecting the amount of casting sand in the receiver;   a stirrer for stirring the casting sand in the receiver;   a stirrer drive unit for driving the stirrer; and   a stirring resistance detection device for detecting the stirring resistance of the stirrer,   wherein the pressure changing device is configured to individually change the pressure levels of the low and high pressures based on the amount of casting sand detected by the casting sand amount detection device and the stirring resistance detected by the stirring resistance detection device.