JPS5932228B2 - How to spray mold release agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a "spraying method for a mold release agent" mainly used in die-casting work, and its purpose is to provide a spraying method that can simplify the treatment of waste liquid (oil-water separation). There is something to do.

Conventionally, when performing die-casting work, a water-soluble mold release agent made by diluting emulsified oil several dozen times with water is sprayed onto the mold using a hand spray gun or automatic spray device, but after spraying, it is no longer necessary. If a water-soluble mold release agent is directly discharged into a drainage canal, it will cause contamination of rivers, groundwater, etc., so it is necessary to separate the emulsified oil into water and fats and oils, and then discharge only the water.

However, with recent advances in surfactants, emulsified oil has become a stable product, so large-scale equipment and large amounts of chemicals are required to separate oil and water from wastewater, and wastewater treatment requires a lot of capital. A problem has arisen that requires On the other hand, conventional emulsified oil has the following features.

(1) There is no fire outbreak, (2) There is no oil mist in the air, (3) The working environment is improved, and (4) It is economical because the diluent is water. The present invention aims to produce the same effect as when spraying emulsified oil diluted several tens of times, and to simplify oil/water separation. Without using it at all, it is forcibly mixed and emulsified using a jet of air or water at the spray nozzle, and then immediately sprayed onto the mold, so that any excess mold release agent that has adhered and flowed down will immediately separate into water and oil. It is characterized by what it did.

In other words, according to the present invention, without using any surfactant that is easily soluble in water, water and oil are mixed together in a spray nozzle forcibly to form an emulsifying mold release agent. Since it is sprayed onto the mold, the mold release oil can be evenly applied to the mold surface. The excess mold release agent that has adhered and flowed down is immediately separated into water and oil, making wastewater treatment extremely easy. The invention can be effectively practiced using the apparatus of FIG.

In Fig. 1, 1 is a holder, in which a pipe fitting 3 is screwed and fixed into a screw hole 2, and a compressed air inlet 4 of the fitting 3 is connected to a pipe 5,
It is connected to a compressed air tank 34 via a cock 20. A spray nozzle T is screwed into the screw hole 6 of the holder 1 by a predetermined amount, and is locked by a fixing ring 8. The nozzle 7 includes a spout 9 and a cylinder 10 concentrically, and a pipe-shaped valve receiver 11 of a rather small diameter is fitted halfway into the cylinder 10. Cylinder 10 and valve receiver 1
A gap 12 having an annular cross section between the two is a portion that becomes a compressed air passage. The valve receiver 11 is screwed into a screw hole 13 in the holder 1, and the flange 14 is crimped onto the bottom surface 15 of the screw hole 6.

The valve receiver 11 has a mold release agent passage 16 in the center,
A seal ring 17 that functions as a valve seat is attached to an annular counterbore at the right end of this passage 16.
The needle 19 of the moving valve 18 is fitted inside. The moving valve 18 is integrated with the needle 19 and has a small diameter piston 21.
, a large-diameter piston 22, and a small-diameter cylinder 25 of the holder 1 via all seals 23 and 24, respectively.
, a compression spring 28 fitted into the large-diameter cylinder 26 and compressed between the large-diameter piston 22 and the valve control cap 27 receives elasticity in the direction that the needle 19 is always seated on the seal ring 17 (towards the left). ing.

The cap 27 is screwed into the screw 29 of the holder 1 and is provided with a ventilation hole 30. The chamber 31 in the large-diameter cylinder 26 communicates with the chamber 33 in the screw hole 6 through an air passage 32, and the strength of the compression spring 28 is such that a predetermined pressure is maintained in the chambers 33, 31 from the air inlet 4. When compressed air is introduced, the valve 18 moves to the right and the seal ring 17 is set to open. 35 is a holder, which is screwed and fixed into the screw hole 36 of the holder 1, and is connected to the water passage 37.
, an oil passage 38, and an oil adjustment needle valve 39.

An inlet 40 of the water passage 37 communicates with a water pressure tank 42 through a pipe 41, and a lower end thereof communicates with a chamber 44 within the screw hole 13 through a passage 43 within the holder 1. An inlet 45 of the oil passage 38 communicates with an oil pressurized tank 47 through a pipe 46, and the other end opens at right angles to the side wall of the water passage 37. FIG. 1 shows a state in which compressed air enters and water and oil are sprayed from the nozzle 9.

To explain the operation of each part up to this state, first open the cock 20 and pump the compressed air in the tank 34 to the pipe 5.
It is introduced into the chamber 33 inside the holder 1 through the pipe fitting 3. The compressed air in the chamber 33 flows from the annular gap 12 into the cylinder 10.
At the same time, part of the air flows into the chamber 3 through the air passage 32.
1, the valve 18 is pushed to the right against the elasticity of the spring 28 to the position shown, and the moving valve 18 is fully opened. At the same time, the mold release agent in the chamber 44 is also removed from the seal ring 17.
It is ejected into the cylinder 10 through the passage 16. Until the mold release agent enters the cylinder 10, it is in a state where oil and fat are simply added to water at a predetermined ratio (for example, 0.2 to 0.5%). However, the unmixed mold release agent released from the passage 16 is sucked and agitated by the air flow that is ejected into the cylinder 10 from the annular gap 12 and rapidly expands under reduced pressure, causing water and oil to enter the air. A uniformly dispersed mist is directly sprayed onto the mold from the nozzle 9. Therefore, the oil and fat in a state diluted with water adheres uniformly to the mold in the form of fine particles, and it is possible to expect the same mold release effect as when emulsified oil is used. When the pot 20 is closed, the pressure inside the chamber 31 is reduced, and the needle 1
9 seats on the seal ring 17, blocking the mold release agent, and the spraying is completed. In the present invention, the mold release oil is not only not water-soluble, but also water and water-insoluble mold release oil are mixed at the spray nozzle without using any surfactant, so that the mold Excess mold release agent that adheres to the surface and flows down immediately separates into water and oil, and waste liquid treatment (
(oil/water separation) becomes extremely simple and inexpensive. Even though the mold release oil is water-insoluble and does not contain a surfactant, it is difficult to spray it onto the mold immediately after it is forcibly mixed with water and emulsified by a jet of air or water in a spray nozzle. As a result, the mold release oil can be applied uniformly to the mold surface. In addition, in the present invention, water and water-insoluble mold release oil are forcibly mixed and emulsified using a jet of air or water at the spray nozzle, so that when mechanically mixing and emulsifying with a stirrer or the like, In comparison, there is an advantage that a drive mechanism, driving force, etc. are not required, and the structure of the spray nozzle portion is simplified. Note that when embodying the present invention, a method of atomizing oil and fat using only water may be adopted.

In that case as well, emulsification can be carried out at the nozzle tip without the aid of a surfactant. Moreover, various oils and fats having a mold release function can be used. Other effects of the present invention are listed below. (1)
No fire outbreak (because forced emulsified oil is used).

(2) Oil does not fly into the air.

(3) Improved work environment.

(4) Economical.

(5) Oil-water separation becomes easier, and wastewater treatment equipment becomes simpler.

It also requires less capital for equipment. (6) Die-casting mold cooling can be done easily.

(7) Pigments that react with water can also be used by mixing them with fats and oils.

[Brief explanation of drawings]

Figure 1 shows a device (atomizer) particularly suitable for carrying out the invention.
FIG. 7...Spray nozzle.

Claims (1)

[Claims] 1 Water and a water-insoluble mold release oil are forcibly mixed and emulsified using a jet of air or water at a spray nozzle without using any surfactant, and then immediately sprayed onto a mold.
A method for spraying a mold release agent, characterized in that excess mold release agent that has adhered and flowed down is immediately separated into water and oil.