JPH0337826B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for pre-adjusting a spray point by a spray gun.

(Prior Art) For example, in mold casting, a mold release agent is applied to the surface of the mold every one or every few shots of casting for the purpose of preventing seizure and improving the casting surface. The application of such a mold release agent is generally done by hand, but recently, in consideration of productivity and labor saving, multiple spray guns are fixedly arranged around the mold and spray guns are applied as the mold opens. Automatic spraying, which automatically sprays the mold release agent from the spray gun, has come to be carried out. In this case, since the damaged area of the mold is generally in a limited area, it is common practice to set spray points in advance and spray the mold release agent concentratedly at those points. be.

By the way, the above-mentioned spray point naturally differs depending on the type of mold, and therefore the nozzle direction of the spray gun must be adjusted every time the mold is changed. This adjustment is also necessary when replacing the spray gun due to nozzle or valve failure.

(Problem to be Solved by the Invention) Conventionally, in order to adjust the nozzle direction, the mold release agent was actually sprayed onto the mold at a predetermined position with the mold open, and the sprayed area was visually checked. It depends on how you do it.

However, in the actual method of spraying the mold release agent, it is difficult to determine the spray point in a strict sense due to the spread of the spray pattern, and especially when spraying from multiple nozzles at the same time, there is interference between the mold release agents. This has caused the problem that the determination becomes even more difficult. In addition, such a method of spraying a mold release agent has the problem of not only increasing wastage of the mold release agent but also deteriorating the working environment.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a method for accurately and easily adjusting a spray point.

(Means for Solving the Problems) Therefore, the present invention emits visible light toward the surface of the object to be coated in a direction coaxial with the axis of a spray nozzle for spraying the object to be coated, and the emitted light The gist is that the position of the spray nozzle is set as the irradiation point on the surface of the object to be coated, and the direction of the spray nozzle is adjusted while visually checking the irradiation point.

As the visible light, it is preferable to use laser light in consideration of light convergence. Of course, it is also possible to use light other than the laser light, and in this case,
Try to converge the light using a converging lens or the like.

This law is applicable to fields where spray guns are fixedly arranged and automatically sprayed, and where the spraying is carried out partially on the object to be coated.For example, spraying a mold release agent onto a mold. This applies to spraying paint onto parts.

(Function) In the spray point adjustment method with the above configuration, the light spot on the surface of the object to be coated due to the emitted light becomes the spray point, and while visually checking the light spot, spray is applied to the target area. Adjustment of the spray point is completed by simply adjusting the nozzle direction (installation direction).

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIGS. 1 to 4 show an embodiment of the present spray point adjustment method for spraying a mold release agent onto a die-casting mold. In these figures, 1 is a fixed die provided on a fixed die 2;
3 is a movable mold provided on the movable die 4;
is capable of moving forward and backward toward the fixed die 1 together with the movable die 4 by a drive means (not shown). The fixed mold 1 and the movable mold 3 each have a corresponding concave portion 1a or convex portion 3a, and the corners of these concave portions 1a or convex portions 3a are particularly prone to seizure.

Spray guns 5, 5, . . . are fixedly arranged around the mold. The spray gun 5 is for selectively spraying a mold release agent onto the corners of the concave portions 1a or convex portions 3a (areas that are prone to seizure) of the mold, and consists of a main body 6 and a nozzle 7. The main body 6 has mold release agent piping 8, 8..., air piping 9, 9.
...is connected. The spray gun 5 is attached to the support shaft 10 using a universal joint 11 and a nut 12 so that its angle can be adjusted.

In the above configuration, the mold release agent is injected from the spray gun 5 at the timing of mold opening (Fig. 1) every shot or every few shots of casting, thereby easily causing seizure of the fixed mold 1 or the movable mold 3. Spray mold release agent on the area.

However, when the spray gun 5 itself is replaced or the mold setup is changed, the spray point must be adjusted. Therefore, in this embodiment, the following elements are added to the spray gun 5. , the spray point has been adjusted.

That is, a rod-shaped laser oscillator (light generator) 13 is attached to the tip of the nozzle 7 of the spray gun 5 at the joint 1.
Connect by 4. The laser oscillator 13 is He
- It consists of a main body part 15 that has a built-in He gas laser tube and generates red laser light, and a cylindrical mounting part 16 that can be fitted into the nozzle 7, and includes a power supply box 17, a connector 18, and a power cable 19. are connected via. The power supply box 17 is common to each laser oscillator 13, and has a power switch 17a for each laser oscillator.

The structure of the joint 14 that connects the nozzle 7 and the mounting part 16 includes an axial slit 16 at one end of the mounting part 16, as shown in detail in FIGS. 3 and 4.
an adapter 2 with a slit (not shown) provided thereon and a tapered surface 20a on the outer periphery.
0 is fitted, and its axial removal is restricted by a stopper 21 protruding from the mounting part 16.
The inner surface of the opening end of the nut 22, whose bottom portion is screwed into the nut 22, can be engaged with the tapered surface 20a of the adapter 20. Note that the tapered surface 20a of the adapter 20
has a positive slope toward the front end side (opening end side of the mounting portion 16). As a result, when the nozzle is inserted into the mounting portion 16 and the nut 22 is turned to advance it in the direction of arrow A (forward), the adapter 20 is pushed by the nut 22 and contracts in diameter in the direction of arrow B, following this. Then, the diameter of the tip of the attachment part 16 is also reduced as shown by arrow B, so that the nozzle 7 and the laser oscillator 13 can be kept concentrically.

With this configuration, when trying to adjust the spray point by replacing the spray gun 5 itself or changing the mold setup, first connect the laser oscillator 1 to the spray gun 5 using the joint 14.
3 concentrically, and then turn on the switch 17a of the power supply box 17. Then, the laser oscillator 13 emits a red laser beam as shown by the arrow (Fig. 1) toward the molds (fixed mold 1 and movable mold 3).
A light spot appears on the mold surface. This light spot becomes the spray point as it is, and the operator loosens the nut 12 while visually checking the light spot to adjust the angle of the spray gun 5, that is, the direction of the nozzle 7.
The light spot is moved to the target area, and the nut 12 is tightened again in this state. This operation is performed for each spray gun 5 one after another, and a series of spray point adjustments are completed.

Since the laser beam has extremely good convergence, it is possible to precisely adjust the spray point.

Here, the connection between the nozzle 7 and the light generator 13 is as follows.
Instead of the above-mentioned embodiment, the structure may be constructed as shown in FIGS. 5 and 6, for example. That is, a tapered threaded portion 31 is provided at the tip of the mounting portion 16 of the light generator 13.
A cap nut 32 can be screwed onto the cap nut 32.
As a result, the nozzle 7 is inserted into the mounting part 16,
When the cap nut 32 is tightened in the direction of arrow A', the diameter of the mounting portion 16 is reduced in the direction of B', so that the nozzle 7 and the light generator 13 can be kept in a concentric state.

If the diameter of the nozzle 7 is smaller than the inner diameter of the attachment part 16, as shown in FIG. If you insert nozzle 7 into 33,
With the same configuration as in the above two embodiments, it is possible to integrate the nozzle 7 and the light generator 13 in a concentric state.

Note that, of course, other light sources such as a standard light source, a light emitting diode, etc. may be used in place of the laser oscillator in the above embodiment. However, if another light source is used, the light should be converged using a converging lens.

Furthermore, the application of this method is not limited to the application of a mold release agent to a mold as in the above embodiments, but can of course be applied to other fields such as the application of paint to parts.

(Effects of the Invention) As described above in detail, the present invention connects a light generator to the tip of a spray nozzle, emits light that is aligned with the axis of the spray nozzle, and illuminates the surface of the object to be coated. By connecting the points, it became possible to adjust the spray point extremely easily just by following the light point. In addition, by appropriately suppressing the spread of the light spot, it has become possible to accurately adjust the spray point.

[Brief explanation of drawings]

1 to 4 show the configuration of an apparatus for carrying out the spray point adjustment method according to the present invention. FIG. 1 is a plan view showing the arrangement around the mold, and FIG. is a schematic diagram showing the connection relationship of each element,
Fig. 3 is a cross-sectional view showing an example of the connection structure between the spray nozzle and the light generator, Fig. 4 is a front view showing the shape of the connection end of the light generator, and Fig. 5 is a cross-sectional view showing an example of the connection structure between the spray nozzle and the light generator. FIG. 6 is a cross-sectional view showing another example of the connection configuration, FIG. 6 is a front view showing the shape of the connection end of the light generator, and FIG. 7 is a front view showing the shape of the sleeve attached to the connection portion. 1, 3...Object to be coated (mold), 7...Spray nozzle, 13...Light generator.

Claims (1)

[Claims] 1 Emit visible light toward the surface of the object to be coated in the coaxial direction of the axis of the spray nozzle for spraying the coating object, and set the position of the emitted light as the irradiation point on the surface of the object to be coated. A method for adjusting a spray point, comprising adjusting the direction of the spray nozzle while visually confirming the direction.