JPH0742665Y2 - Vulcanization mold - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> This invention is a vulcanization provided with a means for removing burrs generated in a mold split portion of a rubber-like elastic product during vulcanization molding. The present invention relates to a molding die.

<Prior Art> When manufacturing a rubber-like elastic product, for example, an oil seal,
A rubber-like elastic material is put in a vulcanization molding die, heated and compressed, and vulcanization molded to obtain a product having appropriate elasticity. Since this vulcanization molding die is a compression molding die, burrs are generated at the die split portion between the upper die and the lower die or the middle die.

Conventionally, the method of removing such flash is to remove only the molded product at the time of mold opening and leave the flash in the mold, and then forcibly remove it from the mold by means such as air blow. Alternatively, a method has been adopted in which the thickness of the flash is increased from the beginning, the molded product is taken out of the mold, and then removed by a cutter or the like.

<Problems to be solved by the invention> However, the method of leaving the flash in the mold increases the working time required for flash removal during the molding cycle, lowers the mold temperature, and removes it by air blow or the like. There are problems such as scattered spills.

Further, in the method of taking out the flash with the molded product, the flash removal work can be performed in a step different from the molding cycle, but there is a problem that extra man-hours are required.

Therefore, an object of this invention is to provide a vulcanization molding die capable of easily removing flash during a molding cycle without increasing the number of steps.

<Means for Solving the Problem> The present invention is a vulcanization molding die for vulcanizing and molding a rubber-like elastic product, which includes an upper die, a lower die, an upper die and a lower die. A middle mold part which is provided between the upper mold part and the lower mold part and cooperates with the upper mold part and the lower mold part to form a cavity, and the upper mold part and the middle mold part are in contact with each other; The deburring plate is embedded so that it can be taken out, and the vulcanization molding mold is closed.When molding, the flash that protrudes from the cavity to the mold part between the upper mold and the middle mold is deburred. Provided is a vulcanization molding die having a structure in which a gap for guiding to a plate is formed.

Further, the present invention is a vulcanization molding die for vulcanizing and molding a rubber-like elastic product, which has an upper die and a lower die which cooperates with the upper die to form a cavity. The deburring plate is removably embedded in the lower mold part of the mold splitting portion where the upper mold and the lower mold are in contact with each other, and the vulcanization molding mold is closed. A mold for vulcanization molding, characterized in that a gap is formed between the mold and a mold to guide a flash protruding from a cavity to a mold splitting portion to a deburring plate.

<Operation> After the vulcanization and molding, the upper mold is opened and the deburring plate is lifted, so that the deburring is lifted together with the deburring plate and separated from the molded product and removed.

<Embodiment> FIG. 1 shows an embodiment of the present invention. This mold is for molding the oil seal 5,
It is composed of an upper die 1, a middle die 2 and a lower die 3. Of course, depending on the product to be molded, it may be composed of only the upper mold and the lower mold. In this embodiment, the upper mold 1, the middle mold 2, and the lower mold 3 form a cavity. The reinforcing ring 4 is set in advance on the core part 3a of the lower mold 3, and the upper mold 1 is closed from above with the mass of the rubber-like elastic material placed on the reinforcing ring 4 to remove the rubber-like elastic material. It flows into the cavity and is heated and compressed. The heating is performed by receiving heat from heating plates provided on the upper die 1 and the lower die 3 respectively. By this heating and compression, a part of the material of the oil seal 5 protrudes into the mold split portion 6 between the upper mold 1 and the middle mold 2 and becomes a flash 7. In this flash 7,
A hump 7a is purposely made at the base of the oil seal 5 so that the flash 7 can be easily cut from the oil seal 5. Then, the deburring plate 8 is taken out upward to the concave step portion 2a provided in the middle die 2 part in the die split portion 6a between the upper die 1 and the middle die 2 where the upper end of the flash 7 is located. It is buried as much as possible. The deburring plate 8 is formed on the ring and is made of a steel plate or a stainless plate that is resistant to dirt and to which burrs do not adhere. After the vulcanization compression molding is completed and the upper mold 1 is opened, the deburring plate 8 is then lifted manually or by an elevating mechanism (not shown), so that the flash 7 moves under the bumps 7a at its root. The oil seal 5 is cut and removed.

Thus, in this embodiment, the flash 7 can be removed without scattering by simply lifting the deburring plate 8 after opening the upper mold 1.

FIG. 2 shows an embodiment in which the present invention is applied to a mold for taking a large number of pieces. As shown in the plan view of FIG. 3, the entire mold has seven molds 9 of the same size, one at the center,
Six radial arrangements are provided around the periphery and are attached to the mold mounting plate 10. Each die 9 has the same structure as that shown in FIG. 1, but the deburring plate 80 is embedded in the die split portion 6a of each middle die 2 as shown in FIG. It has a continuous shape having an opening 80a.

Therefore, in this embodiment, after the mold mounting plate 10 is lifted to lift all the seven upper molds 1 to open the mold,
By lifting the continuous deburring plate 80,
You can remove all seven flashes 7 at once.

<Effects of the Invention> As described above, the vulcanization molding die according to the present invention can be opened by simply opening the upper die and lifting the deburring plate.
The burr can be easily removed from the product without causing the burr to scatter. Therefore, the mold temperature is not lowered during the molding cycle without increasing the number of deburring steps.

[Brief description of drawings]

FIG. 1 is a sectional view of a mold showing an embodiment of the present invention, FIG. 2 is a partial sectional view of a mold showing another embodiment of the present invention, and FIG. 3 is shown in FIG. FIG. 4 is a plan view showing the overall structure of the mold, and FIG. 4 is a plan view of the deburring plate used in the mold shown in FIG. 1 ... Upper mold, 2 ... Medium mold, 3 ... Lower mold, 4 ... Oil seal reinforcement ring, 5 ... Oil seal (product), 6
…… Mold splitting part, 7 …… burrs, 8,80 …… deburring plate,
9 ... Mold, 10 ... Mold mounting plate.

Claims (2)

[Scope of utility model registration request] 1. A vulcanization molding die for vulcanizing and molding a rubber-like elastic product, which is provided between an upper die, a lower die, and an upper die and a lower die. The upper mold and the lower mold cooperate with the middle mold to form cavities, and the deburring plate can be taken out from the middle mold part in the mold part where the upper mold and the middle mold contact each other. It is embedded and the mold for vulcanization molding is closed.A gap is formed between the upper mold and the middle mold for guiding the flash protruding from the cavity to the deburring plate between the upper mold and the middle mold. A mold for vulcanization molding, which is characterized in that 2. A vulcanization molding die for vulcanizing and molding a rubber-like elastic product, which comprises an upper die and a lower die which cooperates with the upper die to form a cavity. The deburring plate is removably embedded in the lower mold part in the mold split portion where the upper mold and the lower mold are in contact with each other, and the vulcanization molding mold is closed. A mold for vulcanization molding, characterized in that a gap is formed between the mold and the mold for breaking the flash out of the cavity into the deburring plate.