JPS6320443Y2 - - Google Patents

Description

[Detailed description of the invention] (Technical field) The invention relates to molds such as press molds manufactured by FMC (full mold casting).
Particularly, this mold is intended to improve mold production efficiency in a mold provided with a chute mounting rod.

(Technical Background) Figure 1 shows the state of a molded product being carried out in a press. Generally, a press-processed molded product 1 is removed from the mold by the lifting and lowering movement of the lifter 2, and is gripped by an iron hand 4 and then pressed into the mold. It is carried out from the mold 3 onto a chute 5 and a conveyor 6.

Therefore, when manufacturing the mold 3 equipped with the chute mounting rod 8 for hooking the chute 5, it is necessary to manufacture ribs using equilateral angle iron or steel blocks, and also to attach the ribs 7 to the mold 3. Since it is necessary to perform various machining processes such as drilling and tapping in order to attach it to the mold 3,
Recently, it has been proposed to perform this mold manufacturing using FMC.

FIG. 2 is a perspective view showing the vicinity of the chute mounting rod 8 of a mold formed by this FMC, and FIG. 3 is a sectional view of a main part showing the molding process.

To mold a mold using this FMC, as shown in Figure 3, before pouring hot water, at the stage of mold model 3M of foamed polystyrene, form rib models 7M, 7M on this mold model 3M, and also form rib models 7M on this mold model 3M. Model 7
A through hole 11 is opened in M and 7M, and a chute mounting rod 8, which does not melt at the temperature of hot water, is inserted into the through hole 11 so that both ends thereof protrude from the rib models 7M and 7M. Pour into a bowl and let it harden thoroughly. By pouring the metal into the mold formed in this way, the mold model 3M etc. are combusted and vaporized,
Instead, a mold 3 in which the chute mounting rod 8 is supported by the rib 12 is obtained.

(Problems with the prior art) However, in this method, both ends of the chute mounting rod 8 are fixedly supported by the ribs 12, so the influence of heat during the inflow of hot water or the cooling of this hot water may damage the material between the two. Due to various factors such as differences in the temperature and coefficient of thermal expansion, distortion may occur in the chute mounting rod, resulting in deformation of the chute mounting rod after the mold is completed, or in extreme cases, the hook portion 9 of the chute may be pulled. There is also a risk that it will be impossible to hook up.

(Purpose of the invention) This invention was made in view of the above points.
The purpose of the present invention is to provide a mold in which a chute mounting rod is not deformed.

(Structure of the invention) In order to achieve the above object, in the present invention, the mold body and ribs are molded from expanded polystyrene, and at least one of the ribs has a through hole formed in the rib with an outer diameter of the chute mounting rod. It is characterized by full mold casting using a model into which a sleeve that has a larger inner diameter and does not melt at the pouring temperature is inserted.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 4A is a perspective view of essential parts showing an example of a mold according to the present invention, and the same members as those shown in FIGS. 1 to 3 are given the same reference numerals.

To explain the FMC used in manufacturing this mold, as shown in Fig. 3, a mold model 3M is made in advance from expanded polystyrene, and this is made of molding sand.
This mold model 3M is made by injecting molten metal while it is buried in the mold and burning and vaporizing the mold model 3M.
Mold 3 is made instead of M.

The present invention utilizes this FMC, and at the stage of mold model 3M of foamed polystyrene before casting, rib models 7M, 7M are formed on this mold model 3M, and rib models 7M, 7M are passed through the mold model 3M. Hole 11
A chute mounting rod 8 made of a metal pipe or round steel bar that will not melt at the temperature of the hot water that will be poured later is inserted into this through hole 11 so that both ends thereof protrude from the rib models 7M, 7M. However, especially in the present invention, as shown in FIG. 4B, one of the two rib models 7M, 7M is directly attached to this rib model 7.
M and the chute mounting rod 8 are in contact with each other, and the other is inserted into the through hole 11 so that the outer diameter D ₁ of the chute mounting rod 8 is in contact with the chute mounting rod 8.
A sleeve 15, which has an inner diameter _D2 larger than that and which does not melt at the temperature of this pouring, is inserted.
In addition, 13 in the figure is a notch groove part.

When the model constructed in this way is buried in foundry sand S and poured with hot water in a compacted state, the chute mounting rod 8 will be elongated once due to the heat of the hot water, but will gradually cool down and contract. , a tensile or compressive load is applied mainly in the axial direction of this rod.

However, since one end of the chute mounting rod 8 is fixed and the other end is free, the chute mounting rod 8 can freely expand and contract even when subjected to the various loads mentioned above, and there is no strain inside the rod. It never happens.

Therefore, even after the molding is completed, the chute mounting rod is attached to the mold body in a straight state.

In addition, in the above-mentioned embodiment, the rib 7 is formed on the side of the mold body 3A since it is a chute mounting rod for product chute, but the present invention is not limited to this. If a rib is protruded from the lower surface of the holder and a chute mounting rod is attached to the rib, it becomes a chute mounting rod for a scrap chute.

Also, the chute mounting rod 8 that comes into contact with this rib 7
Although the uneven portion 13 may be formed on the outer circumferential surface of the rib 7, the engagement with the rib 7 will be further strengthened by doing so.

Further, in the above embodiment, a chute mounting rod is provided between a pair of ribs, but if necessary, three
It is also possible to erect up to four ribs. However, in this case, the chute mounting rod 8 must be cast into at least one of the ribs, and the chute mounting rod 8 must be supported by the ribs of the remaining ribs via the sleeve 15. .

In addition, as shown in FIG. 5, all the rib models 12
After fitting the sleeve 15 into the through hole and fixing the sleeve 15 to the rib 12 by full mold casting, attach the chute mounting rod 8 to the sleeve 15.
It may also be inserted through it.

In this way, the chute mounting rod 8 is not affected by heat at all, so that no bending or the like occurs.

(Effects of the invention) As is clear from the above explanation, according to the invention, the mold body and ribs are molded from expanded polystyrene, and at least one of the ribs has a chute mounting rod in a through hole formed in the rib. Full mold casting was carried out using a model with an inner diameter larger than the outer diameter and a sleeve that does not melt at the pouring temperature. Even if this rod is subjected to thermal influences, the rod itself will not be distorted, and when only the sleeve is provided on the rib model and casted, the chute attachment rod can be attached without any problem.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the configuration near the chute of the press die, Figure 2 is a perspective view showing the main parts of a mold molded using conventional FMC, and Figure 3 is a process of conventional mold forming using FMC. FIG. 4A is a perspective view of the main part showing an embodiment of the present invention, FIG. 4B is a sectional view of the main part in the mold forming process, and FIG. FIG. 3...Mold, 3M...Mold model, 5...Chute, 7M...Rib model, 8...Chute mounting rod,
11...Through hole, 12...Rib, 15...Sleeve, S...Molding sand.

Claims (1)

[Scope of utility model registration request] In a mold configured to support a chute mounting rod with a plurality of ribs protruding from the sides of the mold body, the mold body and the ribs are molded from foamed polystyrene, and at least one of the ribs includes: Full mold casting is performed using a model in which a sleeve having an inner diameter larger than the outer diameter of the chute mounting rod and which does not melt at the pouring temperature is inserted into the through hole opened in the rib. Mold.