JPH08168865A - Device for coating releasing agent - Google Patents

Abstract

PURPOSE: To prevent the dropping of releasing agent in a cavity surface and to eliminate a process for removing the excess releasing agent by uniformly applying the liquid releasing agent on the cavity surface. CONSTITUTION: In the coating device for releasing agent, a cylindrical nozzle body 24 having an opening part (nozzle piece) 26 on the side of applying the releasing agent, an air supplying passage 30 capable of supplying the air toward the opening part 26 in the inner part of this nozzle body 24 and a releasing agent supplying passage 40 capable of supplying the liquid releasing agent from the direction almost orthogonal to the supplying direction of the air in the inner part of the nozzle body 24 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold release agent application device for applying a mold release agent to a cavity surface of a mold for the purpose of facilitating mold release of a molded product in die casting or the like.

[0002]

2. Description of the Related Art A technique relating to the application of a releasing agent of this type is disclosed in, for example, Japanese Patent Laid-Open No. 4-138861.
According to the technique of this publication, a liquid mold release agent stored in a tank is atomized into a mist by a vibrating body vibrating by a high frequency drive voltage, while a casting mold is closed and a cavity inside the mold is closed. The mist-like release agent is supplied to the supply port leading to the. And inside this cavity,
Negative pressure is sucked from a gas vent communicating therewith to introduce a mist-like release agent into the cavity, and this release agent is applied to the cavity surface.

[0003]

However, when the mist-like release agent is introduced into the cavity by negative pressure suction, the amount of the release agent floating in the cavity is not always uniform, and the amount of this release agent is not uniform. Due to the small amount, the uneven adhesion of the release agent to the cavity surface is caused. The uneven release may cause the mold release agent to drip, which causes a casting defect. Further, after the mold release agent is applied to the cavity surface, a step of collecting the excess mold release agent by the negative pressure suction, or removing it by blowing air is required.

One problem to be solved by the present invention is
Liquid mold release agent and air, which are individually supplied to the inside of the nozzle body, collide with each other at a substantially right angle, and the mold release agent is applied to the cavity surface of the mold in the state of being made into fine particles. The purpose is to apply the agent evenly to the cavity surface to prevent the release agent from dripping on the cavity surface, and to eliminate the step of removing the excess release agent. Another problem to be solved by the present invention is to more effectively atomize a liquid release agent and apply it to the cavity surface evenly.

[0005]

In order to solve the above-mentioned problems, the releasing agent applying apparatus of the present invention is constructed as follows. The invention according to claim 1 is a tubular nozzle body having an opening on the side to which the release agent is applied, and an air capable of supplying air to the inside of the nozzle body toward the opening. Similarly, a supply passage and a release agent supply passage capable of supplying a liquid release agent to the inside of the nozzle body from a direction substantially orthogonal to the air supply direction are provided. According to a second aspect of the invention, in the release agent applying apparatus according to the first aspect, at least one of the air supply passage and the release agent supply passage is opened at a plurality of locations inside the nozzle body.

[0006]

According to the present invention, the air supplied from the air supply passage and the liquid release agent supplied from the release agent supply passage are substantially perpendicular to each other inside the nozzle body. The release agent is atomized by this, and is sprayed from the opening of the nozzle body together with air.
It is applied to the cavity surface of the mold. The release agent thus made into fine particles is evenly applied to the cavity surface, which prevents the release agent from dripping on the cavity surface, which causes casting defects. Further, the step of removing the excess release agent adhering to the cavity surface after the application of the release agent by blowing air is also unnecessary. Claim 2
In the invention described, since at least one of the air supplied from the air supply passage and the release agent supplied from the release agent supply passage is introduced into the nozzle body from a plurality of locations, Inside the nozzle body, the air and the release agent collide with each other or are mixed with each other. Therefore, the release agent is more effectively atomized, whereby the release agent is uniformly applied to the cavity surface.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. Example 1 FIG. 1 is a block diagram showing the outline of a release agent coating device. As shown in this drawing, the die for die casting or the like comprises a fixed die 10 and a movable die 12, the fixed die 10 is fixed to a fixed die plate 14 of the machine, and the movable die 12 is fixed to a movable die plate 16 of the machine. Has been done. In FIG. 1, the movable die 12 is moved in the direction away from the fixed die 10 by the operation of the movable die plate 16, and the mold open state is shown. The mold is released between the fixed die 10 and the movable die 12. The agent ejecting section 20 is being entered. The release agent injection unit 20 includes a plurality of injection nozzles 22, and these injection nozzles 22 are the fixed mold 10 and the movable mold 12.
The mold release agent is disposed so as to be sprayed toward the respective cavity surfaces 11 and 13.

FIG. 2 is an enlarged sectional view showing the internal structure of one injection nozzle 22, and FIG. 3 is a sectional view taken along the line AA of FIG. As is apparent from these drawings, the injection nozzle 22
Is a cylindrical nozzle body 24, and the nozzle body 24
An air supply passage 30 capable of supplying air to the inside of the nozzle and a release agent supply passage 40 capable of supplying a release agent to the inside of the nozzle body 24 are configured as main components. A nozzle piece 26 as an opening of the nozzle body 24 is attached to the side of the nozzle body 24 on which the release agent is to be applied by spraying, that is, the side facing the cavity surface 11 (or the cavity surface 13). ing. Further, although the end of the nozzle body 24 on the side opposite to the nozzle piece 26 is closed by a wall 25, a plurality of communication holes 34 for communicating the inside and outside of the nozzle body 24 are formed in this wall 25. There is.

Further, a proximal end portion of a double cylinder 32 arranged on the central axis of the nozzle body 24 is connected to the central portion of the wall 25. The outer cylinder 32a of the double cylinder 32
Has one end (base end) closed and the other end (tip) open near the nozzle piece 26. Double cylinder 3
In FIG. 2, one end (base end) of the inner cylinder 32b is open on the outer side surface of the wall 25, and the other end (tip) is open inside the outer cylinder 32a.

An air pipe 36 is connected to the end of the nozzle body 24 on the side opposite to the nozzle piece 26 by a connecting member 38, and the air sent from a predetermined compressed air source (not shown) by the air pipe 36. Is being guided. The air is supplied into the nozzle body 24 through the communication holes 34 and the inner cylinder 32b of the double cylinder 32. That is, the air pipe 3
6, the communication holes 34 and the inner cylinder 32b constitute the air supply passage 30 for supplying air toward the nozzle piece 26 in the nozzle body 24.

On the other hand, a mold release agent pipe 42 is connected to the outer peripheral portion of the nozzle body 24 in a direction substantially orthogonal to the axis of the nozzle body 24, and the tip of the mold release agent pipe 42 is the outer cylinder of the double cylinder 32. It penetrates through 32a and opens near the tip opening of the inner cylinder 32b. The release agent pipe 42 supplies a liquid release agent to the inside of the nozzle body 24 (inside the outer cylinder 32a). That is, the inside of the mold release agent pipe 42 serves as the mold release agent supply passage 40 for supplying the mold release agent to the inside of the nozzle body 24 from a direction substantially orthogonal to the air supply direction. .

Next, the operation of the release agent coating device constructed as described above will be described. First, the air supply path 3
The air sent by the air pipe 36 forming 0 is supplied to the inside of the nozzle body 24 through the communication holes 34 and the inner cylinder 32b of the double cylinder 32. The air passing through each communication hole 34 is supplied to the outer peripheral portion of the outer cylinder 32a of the double cylinder 32, and the air passing through the inner cylinder 32b is supplied to the inside of the outer cylinder 32a. Flowing.

On the other hand, the liquid release agent sent by the release agent pipe 42 constituting the release agent supply passage 40 is supplied to the inside of the outer cylinder 32a, and the release agent is supplied to the inside. It collides with the air ejected from the tip of the cylinder 32b in a direction substantially orthogonal to the air. As a result, the liquid release agent is atomized inside the outer cylinder 32a and is sent toward the nozzle piece 26 by the force of air. Then, the atomized release agent exits the opening of the outer cylinder 32a, and then the outer cylinder 3
After colliding with the air supplied to the outer peripheral portion of 2a, being mixed and atomized, the nozzle piece 26 is passed through the nozzle body 2
It is jetted out of 4. As a result, the release material is the cavity surface 11 (or the cavity surface 13) shown in FIG.
Evenly applied to.

As described above, in this embodiment, the air supply passage 3 is provided.
0 is opened at a plurality of locations inside the nozzle body 24, and the air supplied from the air supply passage 30 to the inside of the nozzle body 24 flows between the air flowing inside the outer cylinder 32a and the outer cylinder 32a. It is divided into air flowing in the outer periphery. This promotes atomization of the release agent, prevents the release agent applied to the cavity surface 11 (or the cavity surface 13) from dripping, and removes excess release agent by blowing air. The step of performing is also unnecessary.

Embodiment 2 FIG. 4 is a sectional view showing the internal structure of an injection nozzle of Embodiment 2, and FIG. 5 is a sectional view taken along line BB in FIG. As shown in these drawings, in this embodiment, the air supply passage 30 is opened at one place and the release agent supply passage 40 is opened at a plurality of places inside the nozzle body 24. That is, one communication hole 35 is formed in the center of the wall 25 of the nozzle body 24, and air is supplied from the air pipe 36 to the inside of the nozzle body 24 through this communication hole 35. A plurality of (four in the drawing) release agent pipes 43 are connected to the outer peripheral portion of the nozzle body 24 so as to open toward the axial center portion of the nozzle body 24. The liquid release agent is supplied to the inside of the nozzle body 24 through the mold agent pipe 43 in a direction substantially orthogonal to the air supply direction.

In the second embodiment, the liquid release agent supplied from each of the release agent pipes 43 is supplied to the air supplied from the air pipe 36 into the nozzle body 24 through the communication hole 35. It collides and is effectively atomized. Then, the release agent in the form of fine particles is obtained in Example 1
In the same manner as in the case (1), it is sprayed from the nozzle piece 26 and is evenly applied to the cavity surface 11 (or the cavity surface 13). In the second embodiment, members which are considered to have the same or equivalent configurations as those of the first embodiment are designated by the same reference numerals in the drawings, and duplicated description will be omitted. Also, with respect to the third embodiment to be described next, the same idea is used and the duplicated description will be omitted.

Embodiment 3 FIG. 6 is a sectional view showing the internal structure of an injection nozzle of Embodiment 3, and FIG. 7 is a sectional view taken along the line CC of FIG. As is apparent from these drawings, in this embodiment, both the air supply passage 30 and the release agent supply passage 40 are opened at a plurality of locations inside the nozzle body 24. That is, the wall 2 of the nozzle body 24
5, a plurality of communication holes 34 are formed in the same manner as in the first embodiment.
Further, a plurality of (four in the drawing) mold release agent pipes 43 are provided on the outer peripheral portion of the nozzle body 24 toward the axial center portion of the nozzle body 24 as in the case of the second embodiment. Are connected so as to open.

Therefore, in the third embodiment, air is supplied to the inside of the nozzle body 24 from the air pipe 36 through the communication holes 34, and the liquid release agent is supplied through the release agent pipes 43. Are each supplied and collide with each other, and the release agent is more effectively atomized. As a result, the release agent sprayed from the nozzle piece 26 is evenly applied to the cavity surface 11 (or the cavity surface 13).

[0019]

Industrial Applicability According to the present invention, a liquid mold release agent is uniformly applied to the cavity surface of a mold, and it is possible to prevent the mold release agent from dripping on the cavity surface, which causes a casting defect. The step of removing the excess release agent adhering to is unnecessary. Further, according to the present invention, the liquid release agent can be made into fine particles more effectively, whereby the release agent can be applied to the cavity surface more evenly.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a release agent coating device.

FIG. 2 is an enlarged cross-sectional view showing the internal structure of a jet nozzle.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view showing the internal structure of an injection nozzle of Example 2.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a cross-sectional view showing the internal structure of an injection nozzle of Example 3.

7 is a cross-sectional view taken along line CC of FIG.

[Explanation of symbols]

 24 Nozzle body 26 Nozzle piece (opening) 30 Air supply path 40 Release agent supply path

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Naoya Yamamoto 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Masaaki Yamada 4-20 Funahara Town, Mizuho-ku, Nagoya City, Aichi Prefecture Ieda Corporation Within the industry

Claims (2)

[Claims] 1. A cylindrical nozzle body having an opening on the side to which a release agent is applied, and an air supply path capable of supplying air to the inside of the nozzle body toward the opening. Similarly, a release agent applying device is provided with a release agent supply path capable of supplying a liquid release agent to the inside of the nozzle body from a direction substantially orthogonal to the air supply direction. . 2. The release agent coating device according to claim 1, wherein at least one of the air supply passage and the release agent supply passage is opened at a plurality of locations inside the nozzle body. Release agent coating device.