JP3154368B2 - Gas curing type mold making equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gas-curing molding sand which is blown into a cavity of a mold and filled with the molding sand, and a hardening gas obtained by vaporizing triethylamine or dimethylethylamine is passed through the sand. The present invention relates to a gas-curing mold molding apparatus for molding a mold by hardening a filling sand.

[0002]

2. Description of the Related Art Conventionally, as a gas-curing mold molding apparatus as described above, a curing gas is generated by a gas generator as shown in Japanese Patent Publication No. 1-34701, and this curing gas is generated. Gassing cover via piping
In general, the gas is supplied to a gassing box which is closed by the above, and the gas is supplied from the gassing box to the molding sand in the mold. In this case, the gas concentration is set to be high because the higher the concentration of the supplied hardening gas, the shorter the gassing time can be. However, if the gas concentration is increased, the hardening gas will be condensed on portions that come into contact with the hardening gas, such as the gassing box and the blow port of the mold. There was a problem. The present invention has been made in view of the above problems, and has as its object to provide a gas-curing mold molding apparatus capable of performing mold molding with no dew of a curing gas and a smaller amount of a curing gas used. .

[0003]

In order to achieve the above-mentioned object, a gas-curing mold molding apparatus according to the present invention comprises a frame-shaped gasket having an opening vertically penetrating directly above a vertically movable mold. A gas generator is fixedly disposed, a gas generator is connected to a gas inlet of the gassing box through a pipe, and a gassing cover capable of closing an upper opening of the gassing box above the gassing box. In a gas-curing mold molding apparatus disposed so as to be able to move up and down and move horizontally, the temperature of the gas generated by the gas generator can be controlled at approximately 50 ° C., and the piping and the gassing cover are controlled at approximately 50 ° C. A possible heater is installed, and the temperature of the generated gas (approximately 50 ° C.) managed by the gas generator is 30 to 50 ° C. on the side wall of the gassing box.
A heater capable of controlling a high temperature is mounted.

[0004]

According to the present invention, by adopting the above solution, the pipes and the gassing cover which come into contact with the generated hardening gas are controlled at substantially the same temperature as the gas temperature to prevent dew condensation and to connect to the gassing cover. To prevent malfunction due to thermal expansion of each member, and heat the gassing box to a temperature 30 to 50 ° C. higher than the temperature of the hardening gas, so that heat is applied to the mold pressed against the gassing box. It is reported that hardening gas is gasified while preventing dew condensation of gas in the gassing box and the mold.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. At the four corners of the upper surface of the machine frame 1, columns 2 are erected, and at the upper end of the column 2, a ceiling frame 3 which is notched at the center and extended left and right is provided. An elevating cylinder 4 is mounted upward at the center of the upper surface of the machine frame 1, and a tape is attached to the tip of the piston rod 4A.
A lower mold 6 to which an extrusion pin mechanism 6A is attached is provided with a skirt 6B on the upper side of the table 5 to which the table 5 is fixed.
It is mounted and fixed via the. The piston rod 4A
Inside, an inner cylinder 7 is formed, the piston rod 7A of which is projected upward through the table 5, and an extruding plate 7B for operating the extruding pin mechanism 6A is attached to the tip thereof. .

At the lower part of the ceiling frame 3, a support rod 8.
8 is suspended, and a support frame 9.9 is fixed to the lower end of the support rod 8.8.
An upper mold 10 is mounted on the upper surface 9 so as to face the lower mold 6. At the upper position of the support frame 9.9 on the support rod 8.8, a frame-shaped gassing box 12 having an opening 11 penetrating vertically is fixed via a bracket 12A. The sing box 12 is arranged with a slight gap between the sing box 12 and the upper mold 10. A gas inlet 13 is provided on one side of the gassing box 12, and the gas inlet 13 is connected to a gas generator 14 mounted on the support column 2 via a pipe 15. The gas generator 14 sends out the hardening gas to be generated at a temperature of about 50 ° C., and a pipe 15 is wound with a heater 15A controlled at about 50 ° C. Furthermore, the temperature of the gas generated on the side wall of the gassing box 12 is 30 to 50 ° C. lower than the temperature of the generated gas.
Heater that can be controlled to a high temperature of 80 to 100 ° C
12B is mounted.

On the lower surface of the ceiling frame 3, there is fixed a fixed rail 16.16 with a cut-out central portion, and at the center upper portion of the ceiling frame 3, a crimping cylinder 17 faces downward. And its piston rod 17
A mounting plate 18 is fixed to the lower end of A. An internal cylinder 1 is provided in the piston rod 17A of the crimping cylinder 17.
7B, the piston rod 17C of which penetrates through the mounting plate 18 and protrudes downward, and the tip of which is the pressing plate 1
7D is fixed. Elevating rails 19.19 whose lower ends are bent inward are suspended from the front and rear lower surfaces of both ends of the mounting plate 18, and the elevating rails 19.19 are fixed at the raised position. -Same rail located between 16.16
It is arranged so as to be at the highest level.

A frame-shaped carriage 20 is suspended between the fixed rails 16.16 via wheels 21.21 so as to run freely, and the lift rail 19.19 is mounted on the lift rail 19.19. A gassing cover 22 having a size such that the upper part of the opening 11 of the singing box 12 can be closed is positioned below the carriage 20 via the frame 23 and the wheels 24 so as to be suspended and engaged in a freely movable manner. I have. Gassing cover-2
A heater 22A which can be controlled to a temperature substantially equal to the generated gas temperature (about 50 ° C.) is mounted inside 2. A guide pin 25.25 is provided in the gassing cover 22 so as to be vertically slidable and penetrate through an O-ring, and the lower end of the guide pin 25.25 has the opening 11.
And a lower mold 1 on its lower surface.
An extruding plate 27 having an extruding pin 26.26 inserted in the sand blowing hole of No. 0 is fixed. The guide pin 25.2
5 are connected to each other via a mounting frame 28, and the upper surface of the gassing cover 22 and the mounting frame 28 are connected.
And a coil spring 29 is interposed between the
7 is normally pulled up and is in contact with the lower surface of the gassing cover 22.

The mounting frame 28 is provided with a pressing projection 30 corresponding to a pressing plate 17D mounted on the inner cylinder 17B of the crimping cylinder 17. Therefore, when the inner cylinder 17B operates and pushes down the pressing projection 30, the guide pin 25.
25 and the extruding plate 27 are lowered. Further, a sand hopper 31 with a damper is provided at a position on the left side of the ceiling frame 3, and a frame-like truck 32 has wheels 33.33 on a fixed rail 16 provided thereunder. It is suspended and engaged so that it can run freely. Further, a sand blowing head 34 penetrates the fixed rail 16 vertically through the frame-shaped carriage 32, and wheels 35 at the upper end thereof.
And is suspended and engaged so as to be able to run freely via the.

[0010] The heater 15 is constructed as described above.
A, 22A make piping 15 gassing cover 22 approximately 5
While heating to 0 ° C, the gassing box 12 is heated to 80 to 100 ° C by the heater 12B. Gas-hardening molding sand is supplied to the blowing head 34 from the sand hopper 31. In this state, the elevating cylinder 4 operates to raise the lower mold 6 together with the table 5, align it with the upper mold 10, and further slightly raise the upper mold 10 to the lower surface of the gassing box 12. I do. The upper mold 1
To 0, the heat of the gassing box 12 is transmitted and heated. Next, the carriage 20.32 moves to the right, and when the sand blowing head 34 is positioned above the gassing box 12, the cylinder 17 operates to lower the sand blowing head 34 together with the lifting rail 19. , Gassing box 1
After being placed on the upper part of 2 (the blowing nozzle is inserted into the sand blowing port), the inner cylinder 17B is operated to close the upper part of the sand blowing head 34 by the pressing plate 17D and press it downward. Next, the sand blowing head 34 is operated to blow molding sand into the upper and lower molds 10.6, the cylinders 17B and 17 are operated in reverse, and the bogie 32.20 is moved leftward to the position shown in FIG. Return.

Next, the cylinder 17 is operated to move the lift rail 1
9.19 is lowered, and the gassing cover 22 engaged therewith is lowered and placed on the upper part of the gassing box 12 to close the opening 11 and to push out the push pin 26.
Into the sand inlet. Next, the internal cylinder 17B is operated to push the extrusion pin 26 until it is flush with the surface of the upper mold 10, and then the gas generator 14 is operated to generate a hardened gas at approximately 50 ° C. The pipe 15 is fed into the gassing box 12. The hardening gas fed into the mold 10.6 from the gap between the extrusion pin and the sand blowing port.
And flows through the molding sand in the mold, passes below the lower mold 6 and is exhausted. During this time, the hardening gas comes into contact with the pipe 15, the gassing box 12, the gassing cover 22, the upper mold 10, the extruding plate 27, etc., but these parts are heated to a temperature equal to or higher than the gas temperature and are not condensed and are in an atomized state. It will be gashed as it is. Further, since the gassing cover 22 is heated at about 50 ° C., malfunction of the guide pins 25 and 25 due to thermal expansion does not occur.

When gasification of the hardening gas is performed for a predetermined time, the molding sand is hardened and a mold is formed. Thereafter, when the operation of the gas generator 14 is stopped, the cylinder 4 is operated in reverse to lower the lower mold 6 while the operation of the internal cylinder 17B to push the push pin 26 downward is continued. At this time, the mold is attached to the lower mold 6 side. Next, the inner cylinder 7 is operated to push the push pin mechanism 6A.
Is raised to release the mold from the lower mold, and the mold is taken out. During this time, the cylinder 17 and the inner cylinder 17B also operate in reverse to return each member to the state shown in FIG.

[0013]

According to the present invention, as is apparent from the above description, the members which come into contact with the curing gas are heated to prevent dew condensation and to minimize the heating temperature of the gassing cover which operates mechanically. In order not to hinder operation, and to heat the upper mold by heat conduction from the gassing box, dew condensation does not occur at all parts where the hardening gas comes in contact, The effect is significant.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of an essential part showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a main part of an embodiment of the present invention.

[Explanation of symbols]

 10 Upper die 11 Opening 12 Gassing box 12B heater 13 Inlet 14 Gas generator 15 Piping 15A Heater 22 Gassing cover 22A Heater

Claims (1)

(57) [Claims] 1. A frame-shaped gassing box (12) having an opening (11) penetrating vertically is fixedly disposed directly above an upper mold (10) that can be raised and lowered. , A gas generator 14 is connected through a pipe 15 and a gassing cover 22 capable of closing the upper opening 11 of the gassing box 12 is movable above and below the gassing box 12 so as to be able to move up and down and move horizontally. In the gas-curing mold forming apparatus provided, the temperature of the gas generated by the gas generator 14 can be controlled at about 50 ° C., and the pipe 15 and the gassing cover 22 have a temperature of about 50 ° C.
The heaters 15A and 22A, which can be controlled at a temperature of 100 ° C., are mounted, and the gas generator 1 is mounted on the side wall of the gassing box 12.
30 to below the generated gas temperature (approximately 50 ° C.) managed in 4.
Gas curing type mold making apparatus characterized by mounting a heater 12B which can be controlled to a temperature higher by 50 ° C.