JPH0741393B2 - Method of coating release agent for rotor die casting - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for applying a release agent in die casting.

[Technical Background of the Invention and Problems Thereof] Generally, as a method for applying a release agent for die casting, as shown in FIG. 3, a release agent applying apparatus 1 is attached to a fixed die plate upper part 2 of a die casting machine. , A plurality of nozzles 3 are attached to the tip thereof, and nozzle air pipes 4 and nozzle release agent pipes 5 are connected to each nozzle 3,
The nozzle pipes 4 and 5 are the air pipes 6 of the main body of the coating apparatus 1.
It is connected to a release agent pipe 7, the air pipe 6 is connected to a compressed air source, and the release agent pipe 7 is connected to a release agent pressure tank. Furthermore, the release agent coating device 1 is configured to have an elevating mechanism (generally an air cylinder) for the nozzle 3. In this way, when opening the die casting machine,
The nozzle 3 part descends into the space between the molds 8, mixes the air and the mold release agent, blows the mold release agent from the nozzle 3, and the die casting mold 8
A mold release agent is applied to the surface, and after completion, the nozzle 3 is raised, the mold 8 is closed, and die casting is performed again. Since such a mold release agent coating device 1 is accompanied by raising and lowering of the nozzle portion 3, it is difficult to apply it to a mold having a narrow space between the surfaces of the mold 8 when the mold is opened. In particular, as in the die casting of a rotor for an electric motor, the mold shown in FIG. 4 with the structure of four molds has a fixed mold 10 having a casting sleeve 9, a runner 11 and an end ring forming space 12 following it. The sprue mold with 13,
It is composed of four molds, an intermediate mold 15 having a space for accommodating the rotor core 14 and a movable mold 17 having the other end ring forming space 16. The intermediate mold 15 is used to convey the casting roller 18, and the mold is opened. When the post-release agent is applied, since it moves to the outside of the die casting machine, the mold space distance A between the sprue mold 13 and the movable mold 17 is sufficiently large relative to the size of the nozzle part, and there is no problem in raising and lowering the nozzle part. Fixed type between fixed type 10 and sprue type 13
A mechanism for performing a slide cutting of a runner 11 and an end ring forming space 12 which form a sprue die 13 by means of an inclined pin 19 attached to a 10. Therefore, due to its structure, the die-to-die distance B between the fixed die 10 and the sprue die 13 is quite small, and the actual distance is 70
Approximately 100 mm, it is dimensionally difficult to move up and down the nozzle 3 part of the release agent applying device 1 for applying the release agent, and the operation of moving up and down the nozzle 3 part requires extremely high accuracy and is expensive. It was a strange thing. Also, the fixed mold 10 side gate type
The molten metal collides from the casting sleeve 9 at the highest speed on the die surface of 13, so that the temperature becomes high, and the molten metal and the die are apt to stick to each other, which easily causes seizure. Therefore, an effective coating method of the release agent is required. There is also a method in which the nozzle part is fixed and sprayed on the mold surface, but since a nozzle is used, the use of a high-viscosity mold release agent tends to cause clogging of the nozzle part and The application was difficult to automate. (For example, Tomonobu Kanno and Torazo Uehara "Introduction to Die Casting Technology" (Showa 46.3.20) Nikkan Kogyo Shimbun P64) It is an object of the present invention to provide a method for applying a mold release agent for a rotor die casting, which can easily and inexpensively apply a mold release agent to a narrow surface between molds and which can prevent the occurrence of seizure.

[Summary of the Invention] In order to achieve the above-mentioned object, in the present invention, a die casting mold comprising a movable die plate having a movable die and a fixed die plate having a fixed die, and a sprue die having a runner, In the method of applying a mold release agent to the sprue mold runner, a discharge tip formed by connecting an air pipe for supplying air and a mold release agent pipe for supplying the mold release agent is bent in the runner direction. A copper tube pipe is attached to the fixed die plate at a height position where it does not interfere with the mold during mold clamping, and a high-viscosity air mixture formed by mixing air and a high-viscosity release agent from the discharge tip of the copper tube pipe. Provided is a method for applying a release agent for rotor die casting, which discharges and applies a release agent to a collision portion of a runner where molten metal from a casting sleeve penetrating the fixed die and the fixed die plate collides.

Embodiments of the Invention Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the die-casting die of the rotor for an electric motor shows a state in which the die opening is completed after casting, and includes a fixed die 10 having a casting sleeve 9, a runner 11 and an end ring forming space 12 following the die. The sprue mold 13 has, the intermediate mold 15 having a space for housing the rotor core 14, the other end ring forming space
Fixed mold composed of 4 molds of movable mold 17 having 16
10 is attached to a fixed die plate 21. Further, the sprue die 13 is provided with an inclined pin 19 attached to the fixed die 10 for sliding cutting of the runner 11 and the end ring forming space 12.
It is held by. Next, a copper pipe 22 for discharging a high-viscosity air-mixed release agent, which is a mixture of air and a high-viscosity release agent, includes an air pipe 26 for supplying air and a release agent pipe 25 for supplying a release agent. It is formed by connecting and. And this copper pipe 22 is attached to the fixed die plate 21 surface,
The discharge tip 23 faces the surface of the runner 11 of the sprue mold 13 and is provided at a height position where it does not interfere with the mold when the mold is clamped, as shown in FIG. The other end of the copper pipe 22 is connected to a pipe joint 24, and the pipe joint 24 branches to a release agent pipe 25 and an air pipe 26 via check valves 27 and 28, respectively. Agent pipe 25 is discharge pump 29
It is connected to the release agent tank 30 via
26 is connected to a compressed air source such as a compressor 32 via an opening / closing valve 31.

Next, the operation configured as described above will be described. In FIG. 1, the rotor core 14 is die-cast to form the rotor 18, the mold is opened, and the die is ready for the next die-casting. The intermediate die 15 moves to the outside of the die casting machine while holding the rotor 18, discharges the rotor 18 and inserts the rotor core 14, and returns to the inside of the die casting machine again. At this time, the discharge pump 29 is operated for a certain period of time, the releasing agent is pumped from the releasing agent tank 30, and a certain amount of the releasing agent is sent to the pipe joint 24 via the check valve 27. After that, the opening / closing valve 31 in the air pipe 26 operates for a certain period of time, the compressed air from the compressor 32 or the like is sent to the pipe joint 24 through the check valve 28, and the compressed air is released in the copper pipe pipe 22 together with the release agent. Through the discharge tip 23 to become an air-mixing release agent, and the runner 11 of the sprue mold 13
It is spray-applied to the surface. A sprue mold coated with a release agent 13
Completes the preparation for the next casting and is clamped again for die casting.

As described above, according to this embodiment, since the mold release agent is applied to the narrow space between the molds without using the conventional spraying device, the facility cost can be reduced and the following effects can be obtained.

a. Since the tip of the copper pipe is attached to the surface of the fixed die plate that does not interfere with the movement of the die, no setup or movement of the pipe connection is required.

b. A high-viscosity air-mixing mold release agent is sprayed on the runner, which is a sprue mold surface where seizure is likely to occur due to collision of molten metal from the casting sleeve, to concentrate the mold release agent. Since it can be applied, it is possible to apply the release agent only to the necessary portions without impairing the running property due to excess release agent, and it is possible to prevent seizure.

c. Since a high-viscosity air-mixing release agent is applied by air ejection, the high-viscosity release agent does not become a mist, so it does not scatter out of the mold and environmental pollution is small.

d. Since the discharge part is a copper pipe with a diameter larger than the spray discharge port, there is no trouble such as clogging of the discharge part even when using a release agent with high viscosity.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide an inexpensive and effective mold release agent even for a collision portion of a runner where molten metal of a narrow die-casting die where seizure easily occurs collides. Coating can be performed, and rotor die casting work without seizure can be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a release agent coating method according to the present invention, FIG. 2 is a partial sectional front view showing a release agent coating method according to the present invention, and FIG. 3 is a conventional release agent coating method. The front view shown in FIG. 4 is a partial cross-sectional front view showing the structure of the rotor die casting mold. 1 ... Release agent coating device, 2 ... Fixed die plate upper part,
3 ... Nozzle, 4 ... Nozzle air pipe, 5 ... Nozzle release agent pipe, 6 ... Air pipe, 7 ... Release agent pipe, 8
…… Mold, 9 …… Casting sleeve, 10 …… Fixed mold, 11 ……
Runway, 12 …… End ring forming space, 13 …… Spout type, 14
...... Rotor iron core, 15 …… Intermediate type, 16 …… End ring forming space, 17 …… Movable type, 18 …… Rotor, 19 …… Inclined pin, 20 …… Movable die plate, 21 …… Fixed die plate, 22 …… Copper pipe pipe, 23 …… Discharge tip, 24 …… Pipe joint, 25 …… Release agent pipe, 26 …… Air pipe, 27 ……
Check valve, 28 ... Check valve, 29 ... Discharge pump, 30 ... Release agent tank, 31 ... Open / close valve, 32 ... Compressor,
A: Mold space distance, B: Mold space distance.

Claims (1)

[Claims] 1. A die casting mold comprising a sprue die having a runner between a die plate having a movable die and a fixed die plate having a fixed die, wherein a release agent is applied to the runner of the sprue die. In the method, a copper pipe having a discharge tip bent in the runner direction formed by connecting an air pipe for supplying air and a mold release agent pipe for supplying a mold release agent does not interfere with a mold. Attached to the fixed die plate at a height position, a high-viscosity air-mixing release agent formed by mixing air and a high-viscosity release agent from the discharge tip of the copper pipe, the fixed die and the fixed die plate. A method for applying a mold release agent for a rotor die casting, characterized in that the molten metal from a penetrating casting sleeve is discharged and applied to a collision portion of a runner.