JP3889422B2 - Vertical rubber injection molding equipment - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical rubber injection molding apparatus, and more particularly, to a vertical rubber injection molding apparatus in which a mold has a vertically divided structure, and the divided mold is lifted upward by a mold separating apparatus to perform mold separation. .

  Conventionally, as a rubber product vulcanization molding device, rubber material is vulcanized by injecting rubber material downward from the injection device into the mold cavity of the upper and lower split molds. 2. Description of the Related Art A vertical rubber injection molding apparatus is used in which an end portion is held by a mold separating apparatus and lifted upward to perform mold separation.

FIG. 7 specifically shows the main part of the mold separating apparatus in this type of vertical rubber injection molding apparatus.
In FIG. 7, reference numeral 200 denotes a molding die having an upper and lower divided structure.
In the figure, reference numeral 202 denotes a thin middle plate, and 204 denotes a lower die (the upper die is not shown).
Reference numeral 206 denotes an elevating rod in the mold separation device, and an elevating member 208 is provided at the upper end thereof, and a claw member 210 having a holding claw 214 is provided so as to move up and down integrally with the elevating member 208. .

  The holding claw 214 has a holding groove 212 having a U-shape, into which the end of the middle mold 202 as one of the divided molds is inserted and held, and the middle mold 202 faces upward by its own upward movement. And separated from the lower mold 204.

  By the way, there is a case where the middle mold 202 and the lower mold 204, which are formed into a thin plate shape after vulcanization, are in a state of being firmly attached via a rubber product vulcanized and molded in the cavity. When the middle mold 202 is forcibly lifted and the middle mold 202 is peeled off from the lower mold 204, the middle mold 202 once warped as shown in FIG. 7 (II) is warped in the opposite direction by the reaction. In addition, the end of the middle mold 202 jumps or dances inside the holding groove 212, and there is a problem that a loud sound “burn” is generated in the holding groove 212.

In addition, when the middle mold 202 greatly bounces or dances in this way, the middle mold 202 itself is displaced in the holding groove 212.
Therefore, when the separated middle mold 202 is grasped by a robot or the like and pulled out from the holding groove 212, there is a problem that the gripping operation of the middle mold 202 by the robot is not performed accurately.

  Further, the intermediate mold 202 once taken out is inserted into the holding groove 212 again for the next vulcanization molding and held by the holding claws 214, and the middle mold 202 is placed on the lower mold 204 by the lowering of the holding claws 214. When the state is set, there is a problem that the middle mold 202 is displaced in the holding groove 212 in the process of movement.

  The following Patent Document 1 discloses an invention relating to a molding method of a molded article having a bellows portion, in which a rubber injection mold is a fixed mold, a movable mold facing the fixed mold, and a three-part structure of core pins. It is disclosed that the mold is separated into a fixed mold, a movable mold, and a core pin holding the molded product after molding, but this is different from the present invention in the problem and the solution means. This is different from the present invention.

JP-A-10-202705

  The present invention is based on the above situation, and the end of the split mold does not jump in the holding groove in the mold separating apparatus during mold separation, and no loud noise is generated. Another object of the present invention is to provide a vertical rubber injection molding apparatus that does not cause a positional shift after the split mold once taken out is inserted into the holding groove again and before the next vulcanization molding. It is a thing.

  Thus, according to the first aspect of the present invention, the rubber material is vulcanized and molded by injecting the rubber material downward from the injection device into the cavity of the mold having the upper and lower divided structures, and after the vulcanization, the divided mold in the mold is molded. In a vertical rubber injection molding apparatus in which an end of the mold is held by a mold separating apparatus and lifted upward to separate the mold, the mold separating apparatus is provided so as to be movable up and down, and the end of the divided mold is held in a holding groove The holding claw is inserted into the holding claw, and a pressing spring that elastically presses the end of the divided mold inserted into the holding groove downward is attached to the holding claw. It is characterized by being.

  According to a second aspect of the present invention, in the first aspect, the pressing spring is a leaf spring.

Effects and effects of the invention

As described above, the present invention is such that a pressing spring is attached to the holding claw and the end of the split mold inserted into the holding groove is elastically pressed downward by the pressing spring. According to the present invention, when holding the split mold with the holding claws and lifting it upward and separating it from another split mold on the lower side, even if the pair of split molds are stuck to each other via the rubber product Further, it is possible to prevent the split-type end portion held by the holding claws by the reaction at that time from jumping or dancing in the holding groove and generating a loud sound due to the impact at that time.
At the same time, the end of the split mold can be held in the holding groove in a state constrained by the pressing force of the pressing spring. Can be solved.

Similarly, the end of the split mold reinserted in the holding groove for the next vulcanization molding can be correctly positioned and held in the pressed state by the pressing action of the pressing spring, and the position of the subsequent split mold Deviation can also be prevented well.
Here, the pressing spring can be a leaf spring (claim 2).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows the overall configuration of a vertical rubber injection molding apparatus according to this embodiment. As shown in FIG. 1, this vertical rubber injection molding apparatus has an injection device 10 and a molding device 12. is doing.
The injection device 10 plasticizes and fluidizes the injection pot 14 and the ribbon-like rubber material by the rotation of the screw, and pushes the extruder 16 into the injection pot 14 and the rubber material filled in the injection pot 14 in the figure. The plunger 18 which injects from the injection pot 14 by the downward advance movement, and the drive cylinder 20 are provided.
The injection device 10 moves the plunger 18 forward and injects the rubber in the injection pot 14 toward the lower mold 24.

The molding device 12 includes a mold clamping device 22 and a molding die 24.
In FIG. 1, reference numeral 25 denotes a hydraulic device in the mold clamping device 22.
The molding die 24 has an upper and lower divided structure of an upper die 26 (see FIG. 5), a thin plate-like middle die 28, and a lower die 30. As shown in FIG. 3B, a rubber product 32 ( (See FIG. 6).

Here, most of the cavity 34 is formed in the middle die 28.
Further, the rubber product 32 is of a small size, and an extremely large number of cavities 34 are formed in the mold 24, substantially the middle mold 28.
As shown in FIG. 2, the middle mold 28 has a shape in which left and right end portions in the same figure protrude in the same direction.
As shown in FIG. 2, a heat plate 36 is provided on the lower side of the lower mold 30, a heat insulating plate 38 is provided on the lower side, and a first slide plate 40 is provided on the lower side. ing.
Reference numeral 42 denotes a movable plate that moves up and down at the molding position to raise or lower the middle die 28 and the lower die 30 together with the hot plate 36, the heat insulating plate 38, and the like.

The first slide plate 40 extends rearward (leftward in the figure) as shown in FIGS. 1 and 5, and collects wiring connected to the heater embedded in the hot plate 36 on the end thereof. A wiring box 44 is provided, and a second slide plate 46 that also serves as a lid for the wiring box 44 is provided above the wiring box 44.
The second slide plate 46 extends further to the left in the drawing from the wiring box 44.

In the present embodiment, the first slide plate 40, the wiring box 44, and the second slide plate 46 as a whole constitute a slide member 47 (see FIG. 5).
A slide member 47 composed of the first slide plate 40, the wiring box 44, and the second slide plate 46 is moved forward and backward in the left-right direction in FIG.
On the other hand, a table 50 is provided at the front part (right part in FIG. 1) of the molding apparatus 12, and a mold separating apparatus 52 for separating the middle mold 28 and the lower mold 30 in the molding mold 24 is provided on the table 50. Is provided.

The mold separating device 52 has a pair of lifting cylinders 54, a lifting rod 56 driven to move up and down by this, and a lifting member 58 provided at the upper end thereof on the left and right sides in FIG.
A claw member 60 is further provided above the elevating members 58, and the claw members 60 are moved up and down integrally with the elevating member 58.

The claw member 60 has a holding claw 62 provided with a holding groove 64 having a U-shaped cross section extending along the left-right direction in FIGS.
The holding claw 62 inserts and holds both ends of the middle mold 28 in the holding groove 64, and lifts the middle mold 28 and separates it from the lower mold 30 by its own upward movement.

In the present embodiment, as shown in detail in FIG. 4, a pressing spring 66 made of a leaf spring is attached to the holding claw 62.
The pressing spring 66 extends in the same direction as the holding groove 64, and the shape thereof has a generally square shape in which the central portion in the left-right direction in FIG. 4 is convex downward, and each end portion is formed on the holding claw 62. It is fixed.

Next, the operation of the vertical rubber injection molding apparatus of this embodiment will be described.
In this embodiment, the mold 24 is held in the mold-clamped state by the mold-clamping device 22 shown in FIG. 1, and in this state, the plunger 18 is protruded downward in the figure by the drive cylinder 20 to fill the injection pot 14. The fluidized rubber material is injected into the cavity 34 of the mold 24.
In this state, the rubber material injected into the cavity 34 is vulcanized to become a rubber product 32 by being held for a predetermined time.

Thereafter, as shown in FIG. 5I, the middle mold 28 and the lower mold 30 in the mold 24 are lowered, and the slide member 47 is advanced from the left to the right in FIG. Specifically, the middle mold 28 and the lower mold 30 placed on the first slide plate 40 are both brought on the table 50 as shown in FIG. 5 (II).
That is, the middle mold 28 and the lower mold 30 are moved from the molding position to the mold separation position.

At this time, both ends of the middle mold 28 are inserted into the holding grooves 64 of the holding claws 62 while sliding.
FIG. 5 (II) shows the state at this time.
The mold separating device 52 subsequently raises the lifting rod 56 by the lifting cylinder 54.
Then, as shown in FIG. 6, the pair of holding claws 62 that hold both ends of the middle mold 28 in the holding groove 64 are lifted together, lifting the middle mold 28 upward, and separating the middle mold 28 from the lower mold 30.

  At this time, the vulcanized rubber product 32 is held by the middle mold 28 and lifted up integrally, but these rubber products 32 are in a state of being attached to the lower mold 30 with a strong force, that is, the middle mold 28 is lowered. The mold 30 is firmly attached to the mold 30 via a large number of rubber products 32. Therefore, the middle mold 28 can be lifted upward with a strong force by forcibly peeling each rubber product 32 from the lower mold 30. It becomes.

At that time, the middle die 28 is warped and deformed in a downward convex shape and lifted upward. Therefore, when separated from the lower die 30, the middle die 28 tends to warp and deform in the reverse direction due to the reaction.
In the conventional apparatus, due to the movement of the middle mold 28, the end of the middle mold 28 jumps or dances in the holding groove 64, and an impact sound is generated. In this embodiment, a leaf spring is applied to the holding claw 62. Since the pressing spring 66 is attached and the pressing spring 66 presses the end of the middle die 28 strongly and elastically downward, the end of the middle die 28 jumps or dances in the holding groove 64. This phenomenon is well prevented.
Further, the end portion of the middle mold 28 is prevented from being displaced in the holding groove 64 due to a sudden dancing movement.

According to the present embodiment as described above, when the middle mold 28 is lifted upward by the holding claws 62 and separated from the lower mold 30 on the lower side, the pair of split molds are connected to each other via the rubber product 32. Even in the attached state, the end of the middle mold 28 held by the holding claws 62 due to the reaction is prevented from jumping or dancing in the holding groove 64 and generating a loud sound due to the impact at that time. be able to.
At the same time, by holding the end of the middle die 28 in the holding groove 64 in a state constrained by the pressing force of the pressing spring 66, the problem that the forcibly separated middle die 28 is displaced due to the reaction is also solved. can do.

  Similarly, the end portion of the middle die 28 reinserted into the holding groove 64 for the next vulcanization molding can be correctly positioned and held in a positioned state by the pressing action of the pressing spring 66, and the subsequent middle die 28 It is also possible to prevent the misalignment.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is a figure which shows the whole structure of the vertical rubber injection molding apparatus which is one Embodiment of this invention. It is a figure which shows the type separation apparatus in FIG. 1 with a peripheral part. It is the top view and sectional drawing of a middle size. It is a figure which shows the nail | claw member provided with the press spring with a peripheral part. It is operation | movement explanatory drawing of the embodiment. FIG. 6 is an operation explanatory diagram following FIG. 5. It is a figure of the conventional vertical rubber injection molding apparatus.

Explanation of symbols

10 Injection device 24 Mold 28 Medium mold (split mold)
32 Rubber Product 34 Cavity 52 Mold Separator 62 Holding Claw 64 Holding Groove 66 Pressing Spring

Claims (2)

The rubber material is injected downward into the cavity of the upper and lower split molds from the injection device to vulcanize the rubber product, and after vulcanization, the end of the split die in the mold is held by the mold separator. In a vertical rubber injection molding apparatus that is lifted upward and separated into molds, the mold separating apparatus is provided so as to be movable up and down, and has a holding claw that holds the end of the divided mold inserted into a holding groove. A vertical rubber injection molding characterized in that a pressing spring that elastically presses the end of the split mold inserted into the holding groove downward is attached to the holding claw. apparatus.   2. The vertical rubber injection molding apparatus according to claim 1, wherein the pressing spring is a leaf spring.

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