JPH0257761B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method and apparatus for manufacturing a molded product having a bulge on the shaft that protrudes over the entire surface of the umbrella, and relates to an umbrella-shaped valve, a soft rubber It is suitable for manufacturing dowels, rubber bushings, etc.

Conventional technology Conventionally, molded products such as umbrella-shaped valves, soft rubber dowels, and rubber bushings that have a bulge on the shaft that protrudes over the entire surface of the umbrella have a bulge on the outer periphery of the shaft. However, the molded product had the disadvantage that it required a lot of effort to remove it from the mold.

In the conventional method, as shown in FIG. It was then removed from the lower die 6 by holding it in place. This conventional method requires an air nozzle 3, and also has the disadvantage that it requires a lot of work, as it requires reversing the umbrella section 2 and holding and pulling out the inverted section 4 for each molded product. .

Problems to be Solved by the Invention The present invention aims to solve the above-mentioned problems, and it is an object of the present invention to provide a bulge on the shaft portion of an umbrella-shaped valve, a soft rubber dowel, a rubber bushing, etc. that protrudes over the entire surface of the umbrella. In the production of molded products, there is no need for auxiliary tools such as air nozzles, there is no need to invert the umbrella part, and many umbrella-shaped valves can be removed from the mold in one operation, allowing molded products to be manufactured one by one. The object of the present invention is to make it possible to easily remove the mold from the mold without having to manually hold and remove the mold.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention includes an upper mold having a plurality of umbrella forming portions on the lower surface of which form the umbrella portion of the molded product, and below the umbrella forming portions. During press molding with the upper mold, a corresponding umbrella-forming tsuba is formed via the umbrella-forming interval, and at the center of this umbrella-forming tsuba,
A medium mold with a central opening having a diameter larger than the outside diameter of the bulge of the molded product shaft, and a medium mold located below this medium mold.
A molded product in which the middle mold and the lower mold are connected, and the molded product is placed in the central opening of the mold, which consists of a lower mold that has a shaft forming part that forms the shaft of the molded product at a position corresponding to the lower part of the central opening. After heating and pressurizing the forming material with the upper mold and filling it into the umbrella forming part and the shaft forming part, the upper mold and the middle mold are raised to pull out the shaft part from the shaft forming part of the lower mold, and the middle mold is turned over and molded. It is characterized by forming the product by dropping it.

The second invention also provides an upper mold having a plurality of umbrella forming parts on the lower surface of the molded product, and an umbrella forming part provided below the umbrella forming parts at an interval between the umbrella parts during press molding with the upper mold. a corresponding umbrella-forming tsuba, and a middle mold that can be turned inside out and has a central opening with a diameter larger than the outside diameter of the bulging part of the molded product shaft in the center of the umbrella-forming tsuba, and a lower part of this middle mold. and a lower mold provided with a shaft forming part for forming the shaft of the molded product at a position corresponding to the lower part of the central opening.

In addition, the shaft forming part is formed as a fitting protrusion that protrudes above the lower mold and has a tapered upper surface, and a fitting recess into which this fitting protrusion is fitted is formed on the lower surface of the medium-sized umbrella-forming flange. It may be something you did.

Function Since the present invention is constructed as described above, in order to manufacture a molded product in which a bulge is provided on the shaft portion that protrudes over the entire surface of the umbrella portion, the middle mold and the lower mold are first brought into a connected state. Then, a forming material such as rubber for the molded product is placed in the center opening of the medium size. Next, this forming material is heated and pressurized by an upper mold, and the forming material is filled into the umbrella forming interval between the umbrella forming section and the umbrella forming collar and into the shaft forming section. After heating and vulcanizing for a certain period of time, the upper and middle molds are raised to pull out the shaft portion from the shaft forming portion of the lower mold, and the middle mold is turned upside down and the molded product is dropped.

As described above, in order to lift and separate the middle die from the lower die, an umbrella forming flange is placed on the lower surface of the umbrella part. Therefore, the shaft portion having the bulging portion can also be easily pulled out from the shaft forming portion of the lower mold. Also,
Since only the upper mold is located on the upper surface of the umbrella part,
If you turn the middle mold inside out after separating the upper mold from the middle mold, the molded product can be easily separated and dropped from the middle mold, and there is no need for auxiliary tools such as air nozzles.
There is no need to invert the umbrella part. In addition, many umbrella-shaped valves can be removed from the mold in one operation, and there is no need to manually hold and remove each molded product one by one, making it easy to remove from the mold. It is something that can be done.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 10 denotes an upper mold, and the umbrella portion 1 of a molded product 14 is provided with a bulge portion 13 on a shaft portion 12 protruding from one side of the umbrella portion 11.
A plurality of umbrella forming portions 15 are provided to form the umbrella 1. A middle mold 16 is placed below the upper mold 10, and an umbrella-forming collar 17 is placed on the middle mold 16 at a corresponding position below the umbrella-forming portion 15 with an interval between the umbrella-forming portions. And in the center of the umbrella forming tsuba 17,
than the outer diameter of the bulging portion 13 of the shaft portion 12 of the molded product 14,
A central opening 18 with a slightly larger diameter is opened.

Further, the bulging part 13 of the shaft part 12 can be formed into any shape, such as spherical, square, elliptical, etc., depending on the purpose of use. Swelling part 13 in 11 directions
Any structure having a small diameter portion 20 smaller in diameter than the above may be used. Further, a lower mold 21 is located below the middle mold 16, and the lower mold 21 has a shaft forming portion that forms the shaft portion 12 of the molded product 14 at a position corresponding to the lower part of the central opening 18 of the umbrella-forming collar 17. 22 are provided. This shaft forming part 22 is formed so as to be continuous with the umbrella forming part 15 when connected to the upper mold 10 and the middle mold 16, and the lower mold 21
Projects upward and has a tapered upper surface 23
It is formed within the fitting protrusion 24. A fitting recess 25 into which this fitting protrusion 24 is fitted is provided.
is formed on the lower surface of the umbrella-forming collar 17 of the medium size 16.

In order to form the molded product 14 using the lower mold 21, middle mold 16, and upper mold 10 formed in this way, first, the middle mold 16 and the lower mold 21 are connected. Next, the forming material of the molded product 14 is placed in the center opening 18 of the middle mold 16, heated and pressed by the upper mold 10, and the umbrella forming part 15 and the shaft forming part 22 are filled with the forming material. and raise the medium size 16. When the upper mold 10 and the middle mold 16 rise, the umbrella forming collar 17
holds the lower surface of the umbrella portion 11, so the shaft portion 12
can be pulled out from the shaft forming part 22 of the lower mold 21. Next, if the middle mold 16 is pulled out from the gap between the upper mold 10 and the lower mold 21 and turned over, the molded product 14
can be dropped from the medium mold 16, and the work is completed by picking up the fallen molded product 14 by hand or the like.

Effects of the Invention Since the present invention is configured as described above,
By positioning the umbrella forming collar on the lower surface of the umbrella part, the middle mold can be lifted and separated from the lower mold, and the shaft part having the bulge can also be easily pulled out from the shaft forming part of the lower mold.
Moreover, since only the upper mold is located on the upper surface of the umbrella part, the molded product can be easily separated and dropped from the middle mold by turning the middle mold inside out after separating the upper mold and the middle mold.

Therefore, there is no need for auxiliary tools such as air nozzles, no reversal of the umbrella part, and a large number of umbrella-shaped valves can be removed from the mold in one operation.
It is possible to easily remove the molded products from the mold without having to manually hold and remove the molded products one by one.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a conventionally known example, FIG. 2 is a sectional view showing an embodiment of the present invention, and FIG. 3 is a plan view showing an embodiment of a medium size. 10...Upper mold, 11...Umbrella part, 12...Shaft part,
13... Swelling part, 14... Molded product, 15... Umbrella forming part, 16... Medium size, 17... Umbrella forming collar, 18...
... Central opening, 21 ... Lower mold, 22 ... Shaft forming part, 22
... Shaft forming part, 23 ... Tapered shape, 24 ... Fitting protrusion, 25 ... Fitting recess.

Claims (1)

[Scope of Claims] 1. An upper mold having a plurality of umbrella forming portions forming umbrella portions of a molded product on the lower surface, and an upper mold having an umbrella portion forming interval below the umbrella forming portions during press molding with the upper mold. a medium mold which forms a corresponding umbrella-forming tsuba, and has a central opening having a diameter larger than the outside diameter of the bulging part of the molded product shaft in the center of the umbrella-forming tsuba, and is located below the medium mold; A mold consisting of a lower mold having a shaft forming part for forming the shaft of the molded product at a position corresponding to the lower part of the central opening,
The middle mold and the lower mold are in a connected state, and the material for forming the molded product placed in the center opening of the middle mold is heated and pressed by the upper mold to fill the umbrella forming part and the shaft forming part, and then the upper mold and the middle mold are raised. A molded product having a bulge on the shaft protruding from one side of the umbrella part, characterized in that the shaft is pulled out from the shaft forming part of the lower mold, the middle mold is turned upside down, and the molded product is dropped. Production method. 2. The shaft forming part is formed as a fitting protrusion that protrudes above the lower mold and has a tapered upper surface, and a fitting recess into which this fitting protrusion is fitted is formed on the lower surface of the medium-sized umbrella-forming flange. A method for manufacturing a molded product in which a bulge is provided on a shaft portion that protrudes over one surface of the umbrella portion, as set forth in claim 1. 3. An upper mold having a plurality of umbrella forming parts forming the umbrella part of the molded product on the lower surface, and a corresponding umbrella forming flange below the umbrella forming part through the umbrella part forming interval during press molding with the upper mold. At the same time, in the center of this umbrella-forming tsuba, there is a medium mold that can be turned inside out and has a central opening with a diameter larger than the outer diameter of the bulge of the molded product shaft, and a central opening located at the bottom of this medium mold. 1. An apparatus for manufacturing a molded product having a bulge on a shaft protruding from one surface of an umbrella part, comprising a lower mold having a shaft forming part for forming a shaft of the molded product at a downwardly corresponding position. 4. The shaft forming part was formed as a fitting protrusion that protruded above the lower mold and had a tapered upper surface, and a fitting recess into which this fitting protrusion was fitted was formed on the lower surface of the medium-sized umbrella-forming flange. An apparatus for manufacturing a molded product according to claim 3, characterized in that a bulge is provided on a shaft portion projecting from one surface of an umbrella portion.