JPH0547607Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vulcanization mold device, and in particular, to a vulcanization mold device for vulcanizing an unvulcanized string-like body having a reinforcing cord layer inside. Regarding mold equipment.

[Conventional technology]

In general, string-like rubber products (e.g. rubber net-type chains, rubber net-type fences, etc.) that require elasticity in the vertical direction, but do not require much elongation in the length direction and require strength. In the case of manufacturing, a preformed product of a predetermined shape is formed from a reinforcing cord layer and a raw rubber material coated on the outer periphery of the cord layer, and the preformed product is placed in a cavity of a vulcanization mold device. , was vulcanized to form a product.

Conventionally, as shown in FIG. 5, a lower mold c has a cavity recess b having almost the same cross-sectional shape as the finished product on its upper surface a, and an upper mold d has a flat pressing surface. After filling the recess b with an unvulcanized string-like body e, the upper and lower molds c and d were polymerized and vulcanized.

[The problem that the idea aims to solve]

In the conventional vulcanization mold device, the string-like body e is
If the filling method is sloppy, the upper and lower molds may be pressed by parts other than the recess before the recess B is filled accurately, and in such a case, bare parts may occur. It may cause a defective appearance of the finished product, or
As shown in the figure, there were cases in which the position of the cord layer f after being made into the product g was shifted from the center, and the reinforcing effect was impaired.

Therefore, the object of the present invention is to provide a vulcanization mold device that allows unvulcanized cord-like bodies to be easily loaded and in which a reinforcing cord layer is disposed at the shaft center even if the loading method is poor. shall be.

[Means to solve the problem]

In order to achieve the above object, the vulcanization mold device of the present invention has a vulcanized portion whose width dimension of the upper opening is approximately the same as the outer diameter dimension of the unvulcanized string-like body having a circular cross section, and the vulcanized mold device of the present invention. It has a cavity consisting of an unvulcanized string-like body guide section provided continuously above the vulcanized section above the vulcanized section, and the bottom surface of the guide section is slightly wider than the upper opening of the vulcanized section. and a lower mold in which the side surface of the guide part is a sloped guide surface that gradually expands upward; and the lower mold is fitted into the unvulcanized string-like body guide part of the lower mold from above. an upper mold having a pressing convex portion for pressing the unvulcanized string-like body fitted into the guide portion into the vulcanized portion along the guide surface;

[Effect]

After loading the unvulcanized string into the unvulcanized string guide at the upper part of the cavity, if the upper and lower molds are set in a polymerized state, the unvulcanized string will move away from its center position in the guide. Even if it is misaligned, the pressing convex part pushes the string-like body into the vulcanized part along the guide surface, and at this time, the unvulcanized string-like body is placed on the vertical center line passing through the center of the vulcanized part. 1 axis is arranged.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 shows an enlarged cross-sectional view of essential parts of an embodiment of the vulcanization mold device according to the present invention, which includes a lower mold 3 having a cavity 2 into which an unvulcanized string-like body 1 is inserted. and an upper mold 4 that presses the unvulcanized string-like body 1 fitted into the cavity 2, and vulcanizes and molds the unvulcanized string-like body 1.

Thus, the cavity 2 has a size and shape sufficiently larger than the cross section of the finished product, and the upper part serves as the unvulcanized string-like body guide part 5, and the lower part serves as the vulcanized part.

That is, a stepped portion is formed at the center of the side surface of the cavity 2, the portion above the stepped portion serves as a guide portion 6, and the portion below the stepped portion serves as a vulcanized portion 5.

Specifically, the bottom surface 7 of the guide section 5 is made slightly wider than the upper opening of the vulcanized section 6, and the guide section 5
The side surface of the guide surface 8 is a sloped guide surface 8 that gradually expands upward. Further, the width of the upper opening of the vulcanized portion 6 is made approximately the same as the outer diameter of the unvulcanized string-like body 1 having a circular cross section. Note that the side surface of the vulcanized portion 6 is sloped in this embodiment. Further, it goes without saying that the cavity shape of the vulcanized part 6 is made to match the cross-sectional shape of the target string-like body of the finished product.

Here, the unvulcanized string-like body 1 is composed of a reinforcing cord layer 10 made of organic or inorganic fibers, etc., and a raw rubber material 11 covering the cord layer 10, and the reinforcing cord layer is formed at the axial center. 10 is located. Note that this string-like body 1 is manufactured in advance using, for example, an extrusion molding machine 15 as shown in FIG. 4. In addition, when manufacturing preformed products, in order to have no bare parts in the finished product and to obtain a good-looking skin finish, the volume of the raw rubber material 11 is slightly larger than the cavity volume of the vulcanization part 6 of the mold. Cover.

Next, the upper mold 4 has a pressing convex part 12 that is fitted into the guide part 5, and the upper and lower molds 4 and 3 are set in a vulcanizing press machine equipped with a hot platen so that they are mutually pressed. When it approaches, the string-like body 1 in the guide part 5 is pushed and pressed properly into the vulcanization part 6, and when it approaches further and becomes polymerized as shown in FIG. The inside of the vulcanization section 6 is filled with the string-like body 1, and the raw rubber material 11 of the string-like body 1 is vulcanized by pressure and heating to form a finished product S of the string-like body.

Therefore, in the formed finished product S, the reinforcing cord layer 10 is properly disposed at the axial center position.
However, even if the string-like body is placed in a position shifted from the guide portion 5 as shown by the imaginary line in FIG.
This is because they are pressed and guided into the vulcanization section 6 one after another as shown by the arrows. Moreover, when guided, the axis of the unvulcanized string-like body 1 is arranged on the vertical center line passing through the center of the vulcanized part 6, and the finished product S after vulcanization is shown in FIG. ), the code layer 10
is placed in the center of the finished product S. In addition, string-like body 1
Even in the case where the cord layer 10 is overlapped twice (see FIG. 2), it is possible to form a finished product S in which the cord layer 10 is arranged in the center.

Note that in the state shown in FIG.
2 and the bottom surface 7 to guide surface 8 of the guide section 5, minute gaps 13, 13 are formed from which the raw rubber 11 protrudes, and the material left over from filling the vulcanized section 6 is
This minute gap 13, 1 serves as a so-called speed section.
It protrudes from 3.

Further, FIG. 2 shows a modified example, in which chamfered portions 14, 14 are formed on the upper edge of the cavity 2, and the inclination angle of the guide surface 8 is changed to a slope slightly inclined with respect to the vertical plane. It is said that In other words, the chamfered portions 14, 14 make it easier to prepare the string-like body 1.

Next, FIG. 3 shows another embodiment, in which case,
A stepped portion is formed on the guide surface 8 of the guide portion 5, and the upper opening 9 side is wider. Therefore, in this case as well, if the upper and lower molds 4 and 3 are made into a polymerized state as shown by the imaginary line after the string-like body 1 is charged into the guide portion 5, the raw rubber material 11 of the string-like body 1 is is the vulcanized part 6
It is guided inside and vulcanized, as shown in Figure 1.
A finished product S is formed in which the reinforcing cord layer 10 is arranged at the axial center position. As described above, the stepped shape has the advantage that mold processing is easy. Also in this embodiment, it is preferable to form chamfered portions 14, 14 on the upper edge of the cavity 2.

Note that the present invention is not limited to the above-mentioned embodiments, and the design may be changed without departing from the scope of the present invention. For example, when the guide surface 8 of the guide portion 5 is sloped, the angle of inclination may be changed arbitrarily. Yes, there is also information screen 8
When the stepped portion is stepped, the number of stepped portions is not limited to one. Furthermore, the guide portion 5 may have only one guide surface 8.

[Effect of idea]

Since the present invention is configured as described above,
This produces the following effects.

Since the unvulcanized string-like body guide portion 5 of the lower mold 3 has a sloped guide surface 8 whose side surface gradually expands upward, the upper opening 9 of the guide portion 5 is wide. When inserting the unvulcanized string-like body 1 into the guide portion 5, it is extremely easy to fit the unvulcanized string-like body 1 into the guide portion 5, and work efficiency is improved.

Even if the preparation accuracy is poor to some extent, if the upper and lower molds 4 and 3 are placed one on top of the other, the string-like body 1 of the guide part 5 will be guided into the vulcanizing part 6 by the pressing convex part 12. . At this time, since the width of the upper opening of the vulcanized part 6 and the outer diameter of the unvulcanized string-like body 1 having a circular cross section are approximately the same, the vertical direction passing through the center of the vulcanized part 6 is The axial center of the unvulcanized string-like body 1 is disposed on the center line, and no bareness occurs in the finished product S, and no defective appearance of the finished product S occurs.

If the string-like body 1 has a reinforcing cord layer 10 at the axial center, in the finished product S, the reinforcing cord layer 10 is arranged at the axial center of the finished product S, and the reinforcing effect of the reinforcing cord layer 10 is is not damaged, and the reinforcing cord layer 10 is the finished product S.
It will not be exposed on the surface and will not cause poor appearance.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of the main part showing one embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main part showing a modification, and Fig. 3 is an enlarged sectional view of the main part showing an embodiment of the present invention.
The figure is an enlarged sectional view of a main part showing another embodiment, and FIG. 4 is a sectional view of one embodiment of a string-like body manufacturing apparatus. FIG. 5 is an enlarged cross-sectional view of the main part of the conventional example, and FIG. 6 is a cross-sectional view of a product manufactured using the conventional mold apparatus. 1... Unvulcanized string-like body, 2... Cavity, 3...
... lower mold, 4 ... upper mold, 5 ... unvulcanized string-like body guide section, 6 ... vulcanized section, 8 ... guide surface, 9 ... upper opening, 12 ... pressing convex Section 14... Chamfered section.

Claims (1)

[Claims for Utility Model Registration] 1. A vulcanized part 6 whose upper opening has a width dimension that is approximately the same as the outer diameter dimension of an unvulcanized string-like body 1 having a circular cross section, and a vulcanized part 6 that is located above the vulcanized part 6. It has a cavity 2 consisting of an unvulcanized string-like body guide part 5 provided continuously to the vulcanized part 6, and the bottom surface 7 of the guide part 5 is slightly wider than the upper opening of the vulcanized part 6. In addition,
A lower mold 3 whose side surface of the guide part 5 is a sloped guide surface 8 that gradually expands upward; and a lower mold 3 that fits into the unvulcanized string-like body guide part 5 of the lower mold 3 from above. An upper mold 4 having a pressing convex part 12 for pressing the unvulcanized string-like body 1 fitted into the guide part 5 into the vulcanized part 6 along the guide surface 8.
A vulcanization mold device comprising: 2. The vulcanization mold device according to claim 1, wherein the guide surface 8 is provided with a stepped portion. 3. The vulcanization mold apparatus according to claim 1, wherein chamfered portions 14, 14 are formed on the upper edge of the cavity 2.