JPS645983B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a device for partially coating cores (particularly sand cores).

Conventional molding of cores was usually done manually by an operator using a brush, an air gun, a dipstick, or the like. However, in such manual mold painting work,
It has the disadvantage that unnecessary parts of the core mold are coated, and it is inefficient. Therefore, the present applicant has provided a mold cup filled with a mold coating liquid and shaped to allow the mold coating liquid to be dipped into the part to be coated, which can be moved up and down, and the coating mold can be applied only to the necessary convex portions of the mold. discloses a technique in which the liquid is immersed (Japanese Patent Application No. 54-25040).
As a result, the coating liquid can be applied only to the necessary convex portions of the coating mold, improving and stabilizing the quality, and further saving the coating liquid, which has the advantage of saving labor and improving the working environment. However, with this cup-type conventional technique, it is not possible to perform the mold coating work well for cores with complex shapes, that is, cores that have uneven portions that require coating. That is, although it is possible to apply the coating liquid in the cup to the convex portions, the coating liquid cannot reach the concave portions adjacent to the convex portions, making it difficult to coat the concave portions. Therefore, when applying the mold to the recessed areas, workers had to rely on manual labor.

In view of the drawbacks of the prior art, an object of the present invention is to provide an apparatus that can partially apply molding even to the concave portions of the core. In order to achieve this object, the present invention provides a coating mold member having a shape that fits atop the concave portion of the core so as to be movable up and down, and the coating mold member is a sponge impregnated with the coating liquid. It consists of a sub-cup filled with a molding liquid made of a soft material with elasticity, such as wood, or an elastic material such as rubber. The coating liquid is supplied from the coating surface of the soft material or the sub-cup facing the recessed portion of the core to be coated, and it is possible to perform partial molding on the recessed portion.

The present invention will be explained below with reference to the drawings. Figs. 1 and 2 show a plan view and a side view of the core a, respectively, and show portions b, c, and d protruding from the cutout surface l.
and a concave part e, and parts b and c of the convex part
d does not require a coating mold, and d requires a coating mold.
In addition, a region e adjacent to d and recessed from the parting surface l is also considered to be a region requiring coating.

3, 4, and 5 show a mold coating device in the first embodiment for coating the core shown in FIGS. 1 and 2. A coating mold tank 12 containing liquid A is placed therein. Clamp pieces 14 are provided on a bracket 13 fixed to the upper edge of the mold coating tank 12, and hold the core a shown in FIGS. 1 and 2 at its four corners. It is aimed at the mold coating liquid for the part of the core a that is to be molded.

The coating mold cup 18 is located in the coating mold tank 12, and has a shape that allows the mold coating liquid to be immersed in the parts d and e of the core to be coated. The cup 18 is fixed to a perforated plate 20, and the perforated plate 20 is connected to a beam 24 via a bar 22, so that the cup 18 is suspended. Both ends of the beam 24 are connected to the frame 10
Guide groove 28 slidable within the upper upright guide 26
The lower end of the guide groove 28 is connected to a beam 30, the upper end of a piston rod 34 is connected to the center of the beam 30, and the lower end is connected to a piston (not shown) in a cylinder 32.

Cup 1 corresponding to the recess e to be painted on the core a
A coating mold member 36 made of a water-absorbing elastic soft material (for example, sponge, cloth, brush) is installed upright from the bottom of the cup 18, and is fixed by being sandwiched between the crosspieces 38 stretched between the opposing walls of the cup 18. will be established. The soft material 36 has a tip shape that fits at the top of the recess e to be coated.

In the operation of the first embodiment described above, the core a taken out from a core forming machine (not shown) is set above the liquid level in the mold bath 12 using the clamp 14. Next, when air pressure is supplied to the cylinder 9 from the pipe 40, the piston rod 34 extends as shown in FIG. The protrusion d to be coated is immersed. At the same time, the tip of the coating member 36 comes into contact with the recess e of the core to be coated, and the coating liquid contained in the coating member 36 made of a sponge or the like is deposited on the portion e. This is the part d that requires the coating mold,
After the coating of mold e is completed, when air pressure is supplied from the pipe 40', the piston rod 10 contracts and the cup 18 is submerged in the liquid surface, and the cup 1 of the mold coating liquid required for the subsequent work is filled.
8 is filled.

In the second embodiment shown in FIG. 6, the coating mold member 4 is used when there is a protrusion like f in the recess e' of the core a' to be coated.
Indicates 0. The coating mold member 40 is similar to the first embodiment,
It is made of a soft material like a sponge that can be filled with molding liquid. The coating mold member 40 has a concave surface 401 at its top corresponding to a protrusion f, which ensures uniform application of the mold to the area e'. There is no difference in other configurations and operations.

In the embodiment shown in Fig. 7, the core a'' has only e'' recessed from the parting surface l'' and f' slightly protruding from c'' as parts requiring coating, and b'' located on the parting surface l'', It is assumed that the area c″ should not be coated. In this case, the coating cup 18 is not used and the perforated plate 2
0, only a coating mold member 44 made of soft wood is provided. By means of a similar cylinder such as 32 in FIG.
The plate 20 rises, and the mold coating liquid impregnated in the mold coating member 44 comes into contact with portions e'' and f'', and mold coating is performed only on those portions.

In the embodiment shown in FIGS. 8 and 9, the mold bath 12, bar 24, guide 26, etc. of the above-mentioned embodiment are omitted, and the piston rod 34 from the cylinder 32 is connected to the subframe 40. A drainage cup 50 is provided on top of the drain cup 40. A coating mold cup 18 is provided within the drainage cup 50, and a coating mold member 54 is installed upright from the bottom of the coating mold cup 18 as a sub-cup made of an elastic material. The lower end of the coating mold member 54 is connected to a discharge port 601 of a pump 60 via a suction hole 55 and a flexible hose 56 . A suction port 602 of the pump 60 leads to a mold coating liquid tank 64 . The drain cup 50 has a drain hole 66 and a flexible hose 68.
The mold coating liquid is returned to the mold coating liquid tank 64 via.

The pump 60 is driven by a motor 70 and introduces the mold coating liquid into the mold coating member 54 serving as a sub-cup. The coating liquid overflows from the tip of the coating mold cup 18.
The liquid that overflows from the drain cup 50 is returned to the tank 64 via the hose 68. When the piston rod 34 is extended by introducing air pressure into the cylinder 32, the coating member 5 is formed as a sub-cup.
The tip of No. 4 comes into contact with the recess e to be coated. At this time, the mold coating member 54 achieves sufficient adhesion due to its elasticity, and the mold is applied to the recess e. At the same time, the mold cup 18 is immersed in the convex portion d of the core to be molded, and that portion is molded. When air pressure is sent to the cylinder 32 to lower the piston rod 54, the coating member 5
4 is separated from the core a and returns to its original shape due to its elasticity, and the coating liquid sent from the pump 60 is applied to the coating mold member 5.
4 to be refilled.

As described above, according to the present invention, it is possible to apply a mold to the concave portions e, e', and e'' of the core using a sponge or elastic sub-cup whose tip is shaped like the concave portions e, e', e''. become.

[Brief explanation of drawings]

Figures 1 and 2 are a plan view and side view showing the shape of the core to be coated, Figures 3 and 4 are a front view and plan view of the first embodiment, and Figure 5 is an elevation of the cup. FIG. 6 is a partial view of the second embodiment, FIG. 7 is a partial view of the third embodiment, FIG. 8 is a front view of the fourth embodiment, and FIG. 9 is a partial front view of the fourth embodiment. A view taken in the direction of arrow A in the figure. 10... Frame, 12... Coating liquid tank, 14...
... Clamp, 18 ... Coating mold cup, 32 ... Cylinder, 34 ... Piston, 36, 40, 44 ...
Coated mold member made of soft wood, 54... Coated mold member made as an elastic tube, a... Core, d... Convex portion to be coated, e... Concave portion to be coated.

Claims (1)

[Claims] 1. A device for coating a part of the core that is recessed from the cut-off surface, the mold member having a shape that fits exactly into the recessed part of the core and made of an elastically deformable material. The coating mold member is filled with a coating liquid and forms a coating surface facing the recessed portion for supplying the filled coating liquid. A mold coating device for a sand core, comprising a driving means for driving a mold member upward so that the coated surface of the member comes into close contact with a recessed part of the core.