Blow-squeeze molding machine

Abstract: This machine of this invention is for precisely and adequately filling each of upper and lower flask bodies with molding sand, and is equipped with second upper and lower compressed air jet mechanisms, which fluidize molding sand at the side and lower parts in the substantially horizontal part of upper and lower blow heads (4,5). These mechanisms are respectively provided in the upper and lower blow heads, and upper and lower guide members (4a,5a), which guide molding sand so as to disperse it toward the entire area of end openings after the molding sand in the blow heads is first focused on its central part, are projectingly provided in the upper and lower blow heads (4,5). Thus, the molding sand in the upper and lower blow heads (4,5) is almost all fluidized by jetting compressed air from the second upper and lower jet mechanisms (16-19) when molding sand is blow-squeezed into the upper and lower flask bodies (2,3). As a result, molding sand is blown into the upper and lower flask bodies (2,3) while it is dispersed toward the entire area of the end openings of the upper and lower blow heads (4,5).

Description: TECHNICAL FIELD OF THE INVENTION This invention relates to improvements in a blow-squeeze molding machine. BACKGROUND OF THE INVENTION As disclosed in Japanese Utility Model Publication No. 2-14833, one of this type of molding machine for a mold comprises a match plate, upper and lower flask bodies, each of which is disposed so that it can respectively abut upper and lower surfaces of the match plate, upper and lower elevating blow heads which can blow-squeeze molding sand into the upper and lower flask bodies abutting the match plate, and a sand magazine which can blow molding sand into the upper and lower blow heads. However, in the thus-structured molding machine, molding sand is respectively fed from one sand magazine into the upper and lower blow heads. The upper and lower heads in turn simultaneously blow the molding sand into the upper and lower flask bodies, respectively. Thus, it is very difficult to precisely and adequately fill each of the upper and lower flask bodies with molding sand. Hence, as hitherto disclosed in Japanese Patent Early-publication No. 5-337605, a proposal for its improvement has been made wherein mechanisms for jetting compressed air to change the direction of advancing molding sand within the blow heads are provided in the upper and lower blow heads respectively. However, it has still drawbacks in that neither the upper nor lower flask body can be precisely filled with molding sand. This invention was made considering the above-mentioned problem. The purpose of this invention is to provide a blow-squeeze molding machine equipped with mechanisms that can precisely and adequately fill each of upper and lower flask bodies with molding sand. SUMMARY OF THE INVENTION To achieve the above-mentioned purpose, the blow-squeeze molding machine of this invention comprises a match plate, upper and lower flask bodies, which are each disposed so as to be able to respectively abut upper and lower surfaces of the match plate, upper and lower blow heads disposed movably up and down for blow-squeeze molding sand into the upper and lower flask bodies abutting the match plate, a sand magazine for blowing molding sand into the upper and lower blow heads, and first upper and lower jet mechanisms respectively provided in the upper and lower blow heads for jetting compressed air to change the direction of the advancing molding sand so that the molding sand can simultaneously be blow-squeezed into the upper and lower flask bodies abutting the match plate. It is characterized by second upper and lower jet mechanisms respectively provided in the upper and lower blow heads for jetting compressed air so as to fluidize molding sand both at side and lower parts in the horizontal parts of the upper and lower blow heads and upper and lower guide members projectingly provided respectively in the upper and lower blow heads for guiding the molding sand within the upper and lower blow heads such that the molding sand is dispersed towards the entire area of their tip openings after the sand has once been focused on a central part in the upper and lower blow heads. The blow head used for this invention for blow-squeezing molding sand into a flask comprises a first jet mechanism for jetting compressed air to change the direction of the advancing molding sand, a second mechanism for jetting compressed air to fluidize the molding sand both at side and lower parts in the blow head, and a guide member for guiding the molding sand within the blow head to disperse the sand towards the entire area of the tip opening thereof after the sand has first been focused on a central part in the blow head. DESCRIPTION OF THE DRAWINGS Fig. 1 is a section showing one embodiment of this invention. Fig. 2 is an enlarged section showing part of the embodiment of Fig. 1 in detail. DETAILED DESCRIPTION An embodiment of this invention will now be explained in detail by reference to Fig. 1. The blow-squeeze mold molding machine of this invention comprises a match plate 1, upper and lower flask bodies 2,3, each of which can respectively abut the upper and lower surfaces of the match plate 1, upper and lower elbow-shaped blow heads 4,5, disposed movably up and down for blow-squeezing molding sand into the upper and lower flask bodies 2,3 abutting the match plate 1, a sand magazine 6 which can blow molding sand into the upper and lower blow heads 4,5, and upper and lower filling frames 7,8 disposed movably up and down between the upper and lower flask bodies 2,3 and the upper and lower blow heads 4,5. The upper and lower flask bodies 2,3 can be moved up and down by cylinders (not shown). The upper and lower blow heads 4,5 are mounted on the ends of the piston rods of cylinders 10,11 mounted on a frame 9 so that they can be moved up and down by the expansion/contraction movement of the cylinders 10,11. The upper and lower blow heads 4,5 are equipped with first upper and lower jet mechanisms for jetting compressed air to change the direction of molding sand advancing within the blow heads 4,5; second upper and lower jet mechanisms for jetting compressed air to fluidize molding sand at the side and lower parts in the substantially horizontal part of the upper and lower blow heads 4.5; and upper and lower guide members 4a,5a for guiding molding sand within the upper and lower blow heads 4,5 such that the molding sand is dispersed towards the entire area of their tip openings after it has first been focused on a central part in the upper and lower blow heads 4,5. The first upper and lower compressed air jet mechanisms are constituted by first upper and lower nozzles 16,17, which respectively pass through the bending parts of the upper and lower blow heads 4,5, and which are provided with wire netting at their ends, and a source of compressed air (not shown) communicating with the first upper and lower nozzles 16,17. The second upper and lower compressed air jet mechanisms are constituted by second upper and lower nozzles 18,19, which respectively pass through the side and lower parts of the substantially horizontal parts of the upper and lower blow heads 4,5, and which are provided with wire netting at their ends, and a source of compressed air (not shown) communicating with the second upper and lower nozzles 18,19. An example of a detailed arrangement of the first and second lower nozzles 17, 19 is shown in Fig. 2. The arrows show the directions of air jetted through the nozzles. The above-mentioned sand magazine 6 is structured such that upper and lower bending cylindrical bodies 22,23, which can be made to respectively communicate with openings at the base ends of the upper and lower blow heads 4,5, are provided at the lower ends of upper and lower cylindrical storage tanks 20,21, which have compressed air supply openings 20a,21a communicating with a source of compressed air (not shown); upper and lower cylindrical bodies 24,25, with slits penetrating therethrough, are provided inside the upper and lower cylindrical storage tanks 20,21; a first slide gate mechanism 26 is provided at the upper end of the upper storage tank 20; second upper and lower slide gate mechanisms 27,28 are respectively provided between the upper and lower blow heads 4,5 and the upper and lower bending cylindrical bodies 22,23; upper and lower compressed air supply mechanisms 29,30, which supply compressed air toward the tip openings thereof, are respectively provided in the upper and lower bending cylindrical bodies 22,23; and such that the upper and lower filling frames 7,8 are respectively mounted on the ends of the piston rods of the second upper and lower cylinders 31,32 mounted on the frame 9. The thus-structured sand magazine 6 is operated such that a given amount of molding sand is fed into the upper and lower sand storage tanks 20,21; the molding sand inside the upper and lower blow heads 4,5 is blow-squeezed respectively into the upper and lower flask bodies 2,3 and the upper and lower filling frames 7,8 by supplying compressed air to the sand magazine 6 and by causing the upper and lower heads 4,5 to come near each other; and such that at the same time as the blow-squeeze operation occurs, compressed air is jetted from the first and second nozzles 16-19 of the second upper and lower compressed air jet mechanisms. As a result, the molding sand, which has respectively flowed into upper and lower blow heads 4,5 from the upper and lower sand storage tanks 20,21, flows steadily while being almost all fluidized by the compressed air jetted from the first and second upper and lower nozzles 16-19, is dispersed into the entire area of the tip openings after being focused on the central parts by the guide members 4a,5a, and then respectively blow-squeezed from the tip openings of the blow heads 4,5 into spaces defined by the upper and lower flask bodies 2,3 and the upper and lower filling frames 7,8. Thus, nonframe-shaped upper and lower molds can be molded by performing the usual operations indispensable to this kind of molding machine after the blow-squeezing operation of the molding sand has been completed. As is clear from the above descriptions, since in this invention the second upper and lower compressed air jet mechanisms, which fluidize molding sand at side and lower parts in the substantially horizontal parts of the upper and lower blow heads, are respectively provided in the upper and lower blow heads, and since the upper and lower guide members, which guide molding sand so as to disperse it toward the entire area of the tip openings after the molding sand in the blow heads is first focused on its central part, are projectingly provided in the upper and lower blow heads, molding sand in the upper and lower blow heads can almost all be fluidized, and blown into the upper and lower flask bodies while being dispersed toward the entire area of the tip openings of the blow heads. Hence, this invention has superior effects in that each of the upper and lower flask bodies can be precisely and adequately filled with molding sand.

Claims: A blow-squeeze machine equipped with a match plate (1), upper and lower flask bodies (2, 3) which are each disposed so as to be able to respectively abut upper and lower surfaces of the match plate, upper and lower blow heads (4, 5) disposed movably up and down for blow-squeezing molding sand into the upper and lower flask bodies abutting the match plate, a sand magazine (6) which can blow molding sand into the upper and lower blow heads, and first upper and lower jet mechanisms (16, 17) respectively provided in the upper and lower blow heads for jetting compressed air to change the direction of the advancing molding sand so that the molding sand can simultaneously be blow-squeezed into the upper and lower flask bodies abutting the match plate, characterized by second upper and lower jet mechanisms (18, 19) respectively provided in the upper and lower blow heads for jetting compressed air so as to fluidize molding sand both at side and lower parts in the horizontal parts of the upper and lower blow heads and upper and lower guide members (4a, 5a) projectingly provided respectively in the upper and lower blow heads for guiding the molding sand within the upper and lower blow heads such that the molding sand is dispersed towards the entire area of their tip openings after it has first been focused on a central part in the upper and lower blow heads. A blow head used for blow-squeezing molding sand into a flask comprising a first jet mechanism (16, 17) for jetting compressed air to change the direction of the molding sand advancing therethrough, a second jet mechanism (18, 19) for jetting compressed air to fluidize the advancing molding sand both at side and lower parts in the blow head, and a guide member for guiding the molding sand within the blow head to disperse the sand towards the entire area of the tip opening thereof after the sand has first been focused on a central part in the blow head.

Inventors: KOTAKA KAZUO, NOGUCHI MASAHIDE, KOTAKA, KAZUO, NOGUCHI, MASAHIDE
Applicants: SINTOKOGIO LTD, SINTOKOGIO, LTD.
Application year: 1996
Main classification: B22C15
IPC codes: B22C15