Mold forming machine, sand-filling compression unit, and mold forming method

Abstract

A molding machine forms a mold by using transferred molding flask and pattern plate, and includes: a filling frame provided with a lower opening connectable to an upper opening of the molding flask; a squeeze head mechanism including a squeeze board movable into and out from the filling frame, and a plurality of squeeze feet passing through the squeeze board, being able to move up and down with respect to the squeeze board; a sand injection hopper including at least one sand injection port for injecting molding sand into a molding space defined by the molding flask, the filling frame, the squeeze head mechanism, and the pattern plate; and a sand injection nozzle provided in a side portion of the filling frame to enable the sand injection port and the molding space to communicate with each other.

1 : A molding machine forming a mold by using a transferred molding flask and pattern plate, the molding machine comprising:
 a filling frame provided with a lower opening connectable to an upper opening of the molding flask;   a squeeze head mechanism including a squeeze board movable into and out from the filling frame, and a plurality of squeeze feet passing through the squeeze board, being able to move up and down with respect to the squeeze board;   a sand injection hopper including at least one sand injection port for injecting molding sand into a molding space defined by the molding flask, the filling frame, the squeeze head mechanism, and the pattern plate; and   a sand injection nozzle provided in a side portion of the filling frame to enable the sand injection port and the molding space to communicate with each other.   
     
     
         2 : A molding machine forming a mold by using a transferred molding flask and pattern plate, the molding machine comprising:
 a filling frame provided with a lower opening connectable to an upper opening of the molding flask;   an injection frame disposed above the filling frame, being provided with a lower opening connectable to an upper opening of the filling frame;   a squeeze head mechanism including a squeeze board movable into and out from the injection frame, and a plurality of squeeze feet passing through the squeeze board, being able to move up and down with respect to the squeeze board;   a sand injection hopper including at least one sand injection port for injecting molding sand into a molding space defined by the molding flask, the filling frame, the injection frame, the squeeze head mechanism, and the pattern plate; and   a sand injection nozzle provided in a side portion of the injection frame to enable the sand injection port and the molding space to communicate with each other.   
     
     
         3 : The molding machine according to  claim 1 , wherein the sand injection nozzle is inclined to become lower from its inlet toward its outlet. 
     
     
         4 : The molding machine according to  claim 3 , wherein the sand injection nozzle includes a ceiling surface including an inclination angle larger than that of its bottom surface. 
     
     
         5 : The molding machine according to  claim 1 , wherein the at least one sand injection port includes an inclined bottom surface. 
     
     
         6 : The molding machine according to  claim 5 , wherein the at least one sand injection port includes a bottom surface made of ultra-high molecular weight polyethylene. 
     
     
         7 : The molding machine according to  claim 1 , wherein the sand injection hopper includes a lower portion formed of forked chutes. 
     
     
         8 : The molding machine according to  claim 1 , wherein
 the sand injection hopper includes a lower portion formed of forked chutes, and   the filling frame is disposed between the chutes.   
     
     
         9 : The molding machine according to  claim 8 , wherein the filling frame is fixed to the chutes. 
     
     
         10 : The molding machine according to  claim 2 , wherein
 the sand injection hopper includes a lower portion formed of forked chutes, and   the injection frame is disposed between the chutes.   
     
     
         11 : The molding machine according to  claim 10 , wherein the injection frame is fixed to the chutes. 
     
     
         12 : The molding machine according to  claim 8 , wherein the squeeze head mechanism is disposed between the chutes. 
     
     
         13 : The molding machine according to  claim 1 , further comprising a frame surrounding an outer periphery of the pattern plate to be slid up and down, wherein a part of the molding space is defined by the frame. 
     
     
         14 : The molding machine according to  claim 1 , wherein the squeeze head mechanism is supported by two flask setting cylinders such that the squeeze head mechanism descends to perform a flask setting step and a squeezing step. 
     
     
         15 : The molding machine according to  claim 14 , wherein the sand injection hopper is coupled to a plurality of lifting cylinders attached to a lifting support frame provided between upper ends of piston rods of the respective flask setting cylinders. 
     
     
         16 : A sand-filling compression unit used in a molding machine configured to form a mold by using a transferred molding flask and pattern plate, and filling a molding space with molding sand, the sand-filling compression unit comprising:
 a filling frame provided with a lower opening connectable to an upper opening of the molding flask;   a squeeze head mechanism including a squeeze board movable into and out from the filling frame, and a plurality of squeeze feet passing through the squeeze board, being able to move up and down with respect to the squeeze board;   a sand injection hopper including at least one sand injection port for injecting molding sand into a molding space defined by the molding flask, the filling frame, the squeeze head mechanism, and the pattern plate; and   a sand injection nozzle provided in a side portion of the filling frame to enable the sand injection port and the molding space to communicate with each other.   
     
     
         17 : A sand-filling compression unit used in a molding machine configured to form a mold by using a transferred molding flask and pattern plate, and filling a molding space with molding sand, the sand-filling compression unit comprising:
 a filling frame provided with a lower opening connectable to an upper opening of the molding flask;   an injection frame disposed above the filling frame, being provided with a lower opening connectable to the upper opening of the filling frame;   a squeeze head mechanism including a squeeze board movable into and out from the injection frame, and a plurality of squeeze feet passing through the squeeze board, being able to move up and down with respect to the squeeze board;   a sand injection hopper including at least one sand injection port for injecting molding sand into a molding space defined by the molding flask, the filling frame, the injection frame, the squeeze head mechanism, and the pattern plate; and   a sand injection nozzle provided in a side portion of the injection frame to enable the sand injection port and the molding space to communicate with each other.   
     
     
         18 : A mold forming method for forming a mold by using a molding flask and a pattern plate, transferred to a molding machine, the mold forming method comprising:
 a step of defining a molding space by using: the molding flask; a filling frame provided with a lower opening connectable to an upper opening of the molding flask; a squeeze head mechanism including, a squeeze board movable into and out from the filling frame, and a plurality of squeeze feet passing through the squeeze board, being able to move up and down with respect to the squeeze board; and the pattern plate; and   a step of filling the molding space with molding sand using a sand injection nozzle enabling at least one sand injection port provided in a sand injection hopper provided in a side portion of the filling frame to store molding sand, and the molding space, to communicate with each other.   
     
     
         19 : A mold forming method for forming a mold by using a molding flask and a pattern plate, transferred to a molding machine, the mold forming method comprising:
 a step of defining a molding space by using: the molding flask; a filling frame provided with a lower opening connectable to an upper opening of the molding flask; an injection frame disposed above the filling frame, being provided with a lower opening connectable to an upper opening of the filling frame; a squeeze head mechanism including a squeeze board movable into and out from the injection frame, and a plurality of squeeze feet passing through the squeeze board, being able to move up and down with respect to the squeeze board; and the pattern plate; and   a step of filling the molding space with molding sand using a sand injection nozzle enabling at least one sand injection port provided in a sand injection hopper provided in a side portion of the injection frame to store molding sand, and the molding space, to communicate with each other.