JPH0737047B2 - Vulcanization molding equipment for rubber products with inner cylinder fittings - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vulcanization molding apparatus for a rubber product with an inner cylinder fitting.

(Prior Art) Generally, in a conventional vulcanization molding apparatus for rubber products, a molding die is sandwiched between upper and lower hot plates and pressurized by a hydraulic cylinder or the like, and the pressurized state is maintained for a time required for vulcanization. It is like this.

However, this device has a problem that a high-pressure mold clamping device is required, the device configuration is complicated and large-scale, and the equipment cost is high.

Therefore, the applicant of the present invention filed an earlier patent application (Japanese Patent Application No.
52-35392), a recess is formed in a table which also serves as a heating plate, and a plurality of divided molds are inserted into the recess by a pushing means, and a plurality of guide means are used at the time of the insertion. A vulcanization molding apparatus was proposed in which the molding die divided into 2 was moved in the direction perpendicular to the pushing direction to close the mold, and the mold closed state was maintained.

This device has features that it does not require a high-pressure mold clamping device such as a large hydraulic cylinder, has a simple structure, and has a low equipment cost.

(Problems to be Solved by the Invention) However, when manufacturing a rubber product such as a bush with an inner cylinder fitting by this device, the inner cylinder fitting is set at a predetermined position inside the molding die and is positioned with high precision. There was a problem that it was difficult to do.

(Means for Solving the Problem) The device of the present invention has been devised to solve such a problem, and its gist is that the rubber elastic body is fixed to the outer peripheral side of the inner tubular metal member. A vulcanization molding apparatus for rubber products, comprising: (a) a plurality of inner tubular metal fittings divided in a direction perpendicular to the axis, having a molding cavity inside, and having a metal fitting insertion port at one end in the axial direction; On the side opposite to the insertion port of the cavity, a contact portion for axially abutting the end surface of the inner tubular metal fitting and a rubber molding space are tightly fitted to the outer peripheral surface of the end portion of the inner tubular metal fitting. A mold having a fitting portion that shuts off from the outside,
(B) A table that has a recess for inserting the molding die and also serves as a heating plate for holding and restraining the molding die in the mold clamping state, and (c) the molding die is inserted into the recess. Guide means for moving the molding die opened in the direction perpendicular to the axis in the central direction to close the mold, and expanding the mold in the opposite direction when the molding die in the closed state is extruded. ) Extruding means for pushing out the forming die in the recess and expanding it in the direction perpendicular to the axis by the action of the guiding means, and (e) for the forming die pushed out from the recess to be in an open state. The inner tubular metal fitting is axially inserted through the insertion port, and the tip end surface of the inner tubular metal fitting is brought into contact with the abutting portion of the molding die midway, and the molding die is axially moved through the inner tubular metal fitting. At the same time
It has a metal fitting pushing means for closing the mold by the action of the guide means.

(Operation and Effect of the Invention) In the device of the present invention, when the inner cylinder fitting is axially inserted through the insertion opening of the molding die by the pushing means in the state where the molding die is open, and the inner cylinder is pushed in the middle, The tip end surface of the metal fitting comes into contact with the abutment portion of the forming die to apply a pushing force to the forming die.
Then, the molding die moves together with the inner tubular metal member and is pushed into the recess, and is moved in the diameter reducing direction by the action of the guide means, and the die is closed at the pushing end. In this state, the rubber material is injected into the mold to be vulcanized, and during the vulcanization, the mold is held in the recess in the mold clamped state.

ADVANTAGE OF THE INVENTION According to the apparatus of this invention, an inner cylinder metal fitting can be easily inserted and set in a shaping | molding die, and can be positioned in a required position with high precision. This is because, in the apparatus of the present invention, the inner cylinder fitting and the molding die can be inserted or clamped while maintaining a predetermined relative positional relationship. Specifically, for example, according to the device of the present invention, the tip end surface of the inner tubular metal fitting is set so as to be surely brought into contact with the abutting portion of the molding die, and the outer peripheral surface of the end portion of the metal fitting corresponds to the molding die. The rubber molding space is shielded from the outside by ensuring close contact with the fitting portion without gap. Therefore, when the rubber material is injected into the molding space, there is no problem that the rubber material leaks to the outside through the gap between the metal fitting and the molding die to generate burrs.

(Example) Next, the Example of this invention is described in detail based on drawing.

In FIG. 2, reference numeral 10 is a rotary table which also serves as a heating plate, and a rotary shaft 12 is supported by a frame 14. This table
A plurality of recesses 16 are provided in the recess 10 at predetermined intervals, and a mold 18 is inserted and held in the recesses 16.

The molding die 18 is rotated together with the table 10, and is supported on a pedestal 20 at a predetermined injection station and is injected into the molding die 18 by an injection device 22 through a pressing jig 21 (fourth injection hole 23). The rubber material is injected according to the figure.

The mold 18 is kept heated and clamped for a certain period of time to rotate, and is pushed out of the recess 16 at the take-out station to take out the product inside. Then mold
18 reaches the metal fitting supply station, where the inner tubular metal fitting 15 (see FIG. 1) is inserted and set in the molding die 18 by the action of the pushing device 24 and the pushing device 26.

As shown in FIG. 1, a sleeve 27 made of a different material is attached to the table 10 and a mold 18 is inserted into a recess in the sleeve 27. The molding die 18 is composed of split molds 28, 28 each having a half-shape, and has a molding cavity 30 inside. Further, there is an insertion opening 32 for the inner tubular metal fitting 15 on one end side, and further, inside the cavity 30, an abutting portion 34 that abuts on the tip end surface of the inner tubular metal fitting 15, and a metal fitting 15
And a fitting portion 36 which is tightly fitted to the outer peripheral surface of the end portion and shuts off the molding space of the rubber material from the outside.

Dove ridges 38 are provided on the back of each split mold 28, and these ridges 38 are slidably fitted in dovetail grooves 40 formed on the inner surface of the sleeve 27. The ridges 38 and the grooves 40 are inclined in a direction in which the molding die 18 is pushed out, that is, in a direction in which they are separated from each other as the molding die 18 moves to the right in the drawing. That is, the mold 18
And, when it is pushed out, it opens at the same time.

The pushing device 24 has a support frame 42 as shown in FIG. 3 (A), and a cylinder 44 is supported by the support frame 42. A push rod 46 is fixed to the cylinder 44, and a tip portion 48 of the push rod 46 is fixed to the molding die 18
It comes in contact with the bottom part of the and is pushed out from the recess 16 by a certain amount. A guide pin 50 extends from the push rod 46, and the inner tubular member 15 is fitted to the guide pin 50.

On the other hand, the pushing device 26 has a support frame 52 and a cylinder 54 supported by the support frame 52, as shown in FIG.
Push rod 56 and push pipe to the cylinder 54
58 are connected. The push pipe 58 is an inner tubular metal member held by a holding member 62 having a U-shaped receiving portion 60.
It abuts 15 and pushes it in the left direction in the drawing, that is, inside the molding die 18.

Next, the operation of this device will be described.

When the rotary table 10 stops at a predetermined angle position, the pushing device
The cylinder 54 of 26 operates to push the push pipe 58 to the left in the figure. The push pipe 58 extruded, the inner tubular metal fitting 15 held by the holding member 62 in the middle,
At this time, the mold 18 is inserted into the mold 18 through the insertion opening 32 of the mold 18. When the inserted metal fitting 15 reaches a certain position,
As shown in FIG. 1 (B), the tip of the mold abuts against the abutment portion 34 of the mold 18 and pushes the mold 18 leftward in the figure.
Then, the forming die 18, the dovetail ridges 38, and the dovetail groove 40 are guided to the left in the figure, and at the same time, they are moved in the diameter reducing direction,
Close the mold in the final position as shown in (C). At this time, the fitting portion 36 of the molding die 18 is tightly fitted to the outer peripheral surface of the end portion of the inner tubular metal fitting 15 to completely block the rubber molding space from the outside.
The push rod 46 of the extrusion device 24 is moved backward while pressing the molding die 18 from the bottom and applying a constant back pressure as the molding die 18 is pushed.

When the fitting 15 is inserted and set by the above operation, the guide pin 50 and the push pipe 58 are respectively retracted, and then the table 10 is rotated and the molding die 18 reaches the injection station. Then, the injection device 22 injects the rubber material into the mold 18. Then, vulcanization is performed for a certain period of time, and when the vulcanization is completed, the molding die 18 is opened at the unloading station and the product inside is taken out. Next, it reaches the supply station of the metal fittings 15, and there again the metal fittings.
15 supplies are made.

As described above, in the apparatus of this example, since the molding die 18 is closed by interlocking with the pushing of the metal fitting 15 and via the metal fitting 15, the metal fitting 15 can be easily set to a predetermined position and at the same time, Can be positioned with high accuracy.

Although the embodiment of the present invention has been described in detail above, this is merely an embodiment of the present invention, and the present invention is configured in a form in which various modifications are made based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It is possible.

[Brief description of drawings]

FIG. 1 is an operation explanatory view of a vulcanization molding apparatus which is an embodiment of the present invention, and FIG. 2 is an overall configuration diagram of the vulcanization molding apparatus,
FIG. 3 is a main part configuration diagram of an extrusion device and a pushing device of the same vulcanization molding device, and FIG. 10: Rotary table, 15: Inner tube metal fitting 16: Recess, 18: Mold 24: Extrusion device, 26: Pushing device 30: Molding cavity, 32: Insertion port 34: Abutment part, 36: Fitting part 38: Ridge, 40: groove

Claims (1)

[Claims] 1. A vulcanization molding apparatus for a rubber product, in which a rubber elastic body is fixed to the outer peripheral side of an inner cylindrical metal fitting, comprising: (a) a plurality of vulcanization molding devices divided in a direction perpendicular to the axis of the inner cylindrical metal fitting and molded inside. An abutting portion having a cavity and a metal fitting insertion port at one end side in the axial direction, and an abutting portion for abutting the end face of the inner tubular metal fitting in the axial direction on the side opposite to the insertion port of the molding cavity; A molding die having a fitting portion that tightly fits the outer peripheral surface of the end portion of the inner tubular metal member and shuts off the rubber molding space from the outside; and (b) a recess for inserting the molding die, A table that also serves as a heating plate for holding and restraining the mold in the recess in the recess, and (c) the mold that is opened in the direction perpendicular to the axis when the mold is inserted into the recess. And a guide means for expanding the mold in the opposite direction when the closed mold is extruded, while moving the mold toward the center to close the mold. (D) Extruding means for pushing out the forming die in the recess and expanding it in the direction perpendicular to the axis by the action of the guiding means, and (e) for the forming die extruded from the recess and in the open state. The inner cylindrical metal fitting through the insertion port in the axial direction, the tip end surface of the inner cylindrical metal fitting is brought into contact with the abutting portion of the molding die midway, and the molding die is inserted through the inner cylindrical metal fitting. A vulcanization molding apparatus for a rubber product with an inner tubular metal fitting, comprising: a metal fitting pushing means for closing the mold by the action of the guiding means at the same time as pushing in the axial direction.