JPH07232240A - Molding machine for gas hardening mold - Google Patents

Abstract

PURPOSE:To prevent the dew condensation at the part where the hardening gas is brought into contact by providing a heater which can be controlled at the temperature higher than the temperature of the generated gas by the prescribed value on a side wall of a gassing box. CONSTITUTION:A gassing box 12 provided with an opening part 11 is fixed immediately above an elevatable upper die 10. A gas generator 14 is communicated with and connected to a gas inlet 13 through the piping 15. A gassing cover 22 which can cover the opening part 11 is arranged to the upper part of the box 12 in an elevatable and horizontally movable manner. A gas generator is controlled so that the temperature of the gas may be controlled to approximately 50 deg.C. Heaters 15A, 22A which can be controlled at approximately 50 deg.C are mounted on the piping 15 and the gassing cover 22, and a heater 12B which can control the temperature higher than thc temperature of the generated gas (approximately 50 deg.C) by the gas generator 14 by 30-50 deg.C is mounted on the side wall of the gassing box 12. This constitution minimizes the overheated temperature of the gassing cover which is mechanically operated so as not to cause failures in the operation.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a gas hardening type mold making apparatus as described above, as shown in Japanese Patent Publication No. 1-34701, a hardening gas is generated by a gas generator and the hardening gas is generated. Gassing cover through piping
It is general that the gas is supplied to the gassing box that is blocked by, and then the gas is supplied from the gassing box to the molding sand in the mold for aeration. In this case, the higher the concentration of the curing gas to be supplied, the shorter the gassing time, so the gas concentration is made higher. However, if the gas concentration is increased, the curing gas will condense on the parts that come into contact with the curing gas, such as the gassing box and the injection port of the mold, and additional curing gas will have to be fed, resulting in a lot of waste. There was a problem. The present invention has been made in view of the above problems, and an object thereof is to provide a gas-curing mold molding apparatus that does not cause condensation of the curing gas and can perform mold molding with a smaller amount of the curing gas used. .

[0003]

In order to achieve the above object, a gas hardening type mold making apparatus according to the present invention comprises a frame-shaped gutter provided with an opening penetrating vertically just above a mold which can be raised and lowered. A gas box is fixedly installed, a gas generator is connected to the gas inlet of the gassing box through a pipe, and a gassing cover capable of sealing the upper opening of the gassing box above the gassing box. In a gas curing type mold making apparatus in which the − is arranged to be movable up and down and horizontally, the temperature of the gas generated by the gas generator can be controlled to about 50 ° C., and the pipe and the gassing cover are controlled to about 50 ° C. A possible heater is attached to the side wall of the gassing box at 30 to 50 ° C. from the temperature of the generated gas controlled by the gas generator (about 50 ° C.).
It is characterized by mounting a heater that can be controlled at a high temperature.

[0004]

According to the present invention, by adopting the above-mentioned solution means, the piping and the gassing cover which come into contact with the generated curing gas are controlled at a temperature substantially the same as the gas temperature to prevent dew condensation and to be connected to the gassing cover. In order to prevent malfunction of each member due to thermal expansion, and to heat the gassing box to a temperature 30 to 50 ° C. higher than the curing gas temperature, heat is applied to the mold press-bonded to the gassing box. Therefore, the condensation of the gas in the gassing box and the mold is also prevented, and the curing gas is gassed.

[0005]

Embodiments of the present invention will now be described in detail with reference to the drawings. Posts 2 are erected on the four corners of the upper surface of the machine frame 1, and a ceiling frame 3 is formed at the upper end of the post 2 by cutting out the central portion and extending to the left and right. A lifting cylinder 4 is attached upward at the center of the upper surface of the machine frame 1, and a taper is attached to the tip of the piston rod 4A.
The lower mold 6 having the push pin mechanism 6A attached thereto is attached to the upper part of the table 5 and the skirt 6B.
Placed and fixed via. The piston rod 4A
Inside, an internal cylinder 7 is constructed, a piston rod 7A thereof penetrates through the table 5 and is projected upward, and an extruding plate 7B for operating the extruding pin mechanism 6A is attached to the tip thereof. .

Below the ceiling frame 3, a support rod 8.
8 is suspended, and a supporting frame 9.9 is fixed to the lower end of the supporting rod 8.8. The supporting frame 9.
An upper mold 10 is placed on the upper mold 9 so as to face the lower mold 6. At the upper position of the support frame 9.9 of the support rod 8.8, a frame-shaped gassing box 12 having an opening 11 penetrating vertically is fixed via a bracket 12A. The single box 12 is arranged with a slight gap between it and the upper die 10. A gas injection port 13 is provided on one side of the gassing box 12, and the gas injection port 13 is connected to a gas generator 14 attached to the support column 2 through a pipe 15. The gas generator 14 is designed to send out the temperature of the hardening gas to be generated at about 50 ° C., and the pipe 15 is wound with a heater 15A which can be controlled at about 50 ° C. Further, the side wall of the gassing box 12 has a temperature of 30 to 50 ° C. higher than the generated gas temperature.
A heat that can be controlled at a high temperature of 80 to 100 ° C
12B is installed.

A fixed rail 16.16 having a notched central portion is fixed to the lower surface of the ceiling frame 3, and a crimping cylinder 17 faces downward on the upper central portion of the ceiling frame 3. It is provided and its piston rod 17
A mounting plate 18 is fixed to the lower end of A. Inside the piston rod 17A of the crimping cylinder 17, the internal cylinder 1
7B is formed, and its piston rod 17C penetrates through the mounting plate 18 and projects downward, and the pressing plate 1 is attached to the tip thereof.
7D is fixed. Elevating rails 19.19 whose lower ends are bent inward are suspended on the lower surfaces of the front and rear ends of the mounting plate 18. -Located between 16.16 and the same level
It is arranged so as to be at the full level.

A frame-shaped trolley 20 is hangably engaged between the fixed rails 16.16 via wheels 21.21, and the hoisting and lowering rails 19.19 are fitted with the gantry. A gassing cover 22 having a size capable of closing the upper portion of the opening 11 of the single box 12 is positioned below the carriage 20 via the frame 23 and the wheels 24 and is movably suspended and engaged. There is. See also Gassing Hippo-2
A heater 22A capable of controlling the temperature of the generated gas (approximately 50 ° C.) to be substantially the same as that of the heater 22A is installed inside the unit 2. A guide pin 25.25 is provided on the gassing cover 22 so as to be vertically slidable through a 0-ring and penetrates the guide pin 25.25, and the opening 11 is provided at the lower end of the guide pin 25.25.
It is sized so that it can be inserted into
An extruding plate 27 having extruding pins 26.26 inserted into the No. 0 sand blowing holes is fixed. The guide pin 25.2
The upper ends of 5 are connected via a mounting frame 28, and the upper surface of the gassing cover 22 and the mounting frame 28 are connected together.
A coil spring 29 is interposed between the push plate 2 and
7 is always pulled up and brought into contact with the lower surface of the gassing cover 22.

A push-down projection 30 corresponding to a push-down plate 17D attached to the inner cylinder 17B of the crimping cylinder 17 is attached to the attachment frame 28. Therefore, when the inner cylinder 17B operates to push down the push-down protrusion 30, the guide pin 25.
25 and the push-out 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-shaped carriage 32 has wheels 33.33 on a fixed rail 16 provided below the damper. It is suspended and engaged so that it can travel freely. Further, a sand blowing head 34 vertically penetrates the fixed rail 16 through a frame-shaped carriage 32, and wheels 35 are provided at the upper ends thereof.
It is hung and engaged so that it can travel freely via.

The heater thus constructed is a heater 15
Piping 15 gassing cover 22 with A and 22A is approximately 5
While heating to 0 ° C., the gassing box 12 is heated to 80 to 100 ° C. by the heater 12B. Further, gas-hardening molding sand is supplied from the sand hopper 31 to the blowing head 34. In this state, the elevating cylinder 4 operates to raise the lower die 6 together with the table 5 to align with the upper die 10 and further raise slightly to crimp the upper die 10 to the lower surface of the gassing box 12. To do. Upper die 1 by this crimping
The heat of the gassing box 12 is transmitted to 0 and is heated. Next, when the carriage 20.32 moves to the right and the sand blowing head 34 is positioned above the gassing box 12, the cylinder 17 is operated to lower the sand blowing head 34 together with the elevating 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 internal 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 actuated to blow the foundry sand into the upper and lower molds 10.6, the cylinders 17B and 17 are actuated in reverse, and the carriage 32.20 is moved leftward to the position shown in FIG. Return.

Next, the cylinder 17 is actuated to operate the elevating 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 the push pin 26.
Is inserted into the sand blowing mouth. Next, the internal cylinder 17B is operated to allow the extrusion pin 26 to enter the same surface as the mold surface of the upper mold 10, and then the gas generator 14 is operated to generate a curing gas at about 50 ° C. It is sent to the pipe 15 and the gassing box 12. The hardening gas that was sent in was passed through the gap between the extrusion pin and the sand injection port to the mold 10.6.
It flows into the inside of the mold, flows through the molding sand in the mold, passes through below the lower mold 6, and is discharged. 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 since these parts are heated to a temperature equal to or higher than the gas temperature, dew condensation does not occur. It will be gassing as it is. Further, in the gassing cover 22, since the heating is performed at about 50 ° C., the malfunction of the guide pin 25.25 due to the thermal expansion does not occur.

In this way, when the hardening gas is gassed for a predetermined time, the molding sand is hardened to mold the mold. After that, when the operation of the gas generator 14 is stopped, the internal cylinder 17B operates and the cylinder 4 reversely operates and lowers the lower mold 6 while continuing the operation of pushing the pushing pin 26 downward. At this time, the mold is attached to the lower mold 6 side. Next, the internal cylinder 7 is activated and the push pin mechanism 6A
Is lifted to release the mold from the lower mold, and the mold is taken out. During this time, the cylinder 17 and the internal cylinder 17B are also reversely operated to return each member to the state of FIG.

[0013]

As is apparent from the above description, the present invention heats the members that come into contact with the hardening gas to prevent dew condensation and minimizes the heating temperature of the mechanically operating gassing cover. It does not hinder the operation, and the upper mold is heated by heat conduction from the gassing box, so that condensation does not occur at all parts where the curing gas contacts, The effect is remarkable.

[Brief description of drawings]

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

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

[Explanation of symbols]

 10 Upper mold 11 Opening 12 Gassing box 12B Heater 13 Injection port 14 Gas generator 15 Piping 15A heater 22 Gassing cover 22A heater

Claims (1)

[Claims] 1. A frame-shaped gassing box 12 having an opening 11 extending vertically is fixedly arranged immediately above an upper mold 10 which can be raised and lowered, and a gas injection port 13 of the gassing box 12 is provided. , A gas generator 14 is connected and connected through a pipe 15, and a gassing cover 22 capable of closing the upper opening 11 of the gassing box 12 is arranged above the gassing box 12 so that the gassing cover 22 can be moved vertically and horizontally. In the installed gas curing type mold making apparatus, the temperature of the gas generated by the gas generator 14 can be controlled to about 50 ° C., and the pipe 15 and the gassing cover 22 have about 50 ° C.
The heaters 15A and 22A that can be controlled at ℃ are attached, and the gas generator 1 is attached to the side wall of the gassing box 12.
30 ~ than the generated gas temperature (approximately 50 ° C) controlled by 4
Gas hardening type mold making apparatus equipped with a heater 12B that can be controlled at a temperature as high as 50 ° C