JPH0784013B2 - Rubber product manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has two or more cylindrical bodies having different inner diameters by vulcanizing rubber in the gap between the inner surfaces of the upper and lower molds and the outer surface of the core. The present invention relates to an apparatus for manufacturing a rubber product having a large inner diameter and a thin wall portion, for example, a bellows-integrated bump stopper used for an automobile.

[Conventional technology]

As shown in FIG. 4, the conventional manufacturing apparatus has two or more cylindrical bodies 1 and 2 having different inner diameters by vulcanizing rubber in the gap between the inner surfaces of the upper and lower molds and the outer surface of the core 100. A bellows-integrated bump stopper having a large inner diameter and a thin wall portion 2 is manufactured. After the rubber has been vulcanized, the upper and lower molds are opened, and then the tip side of the cylindrical body part 1 is sandwiched by the eight-sided split claw 101.
Inject air from the tip side of 01 to send air between the cylindrical parts 1 and 2 and the core 100 to separate the rubber product from the core 100, then pull out the core 100 in the left-hand direction on the drawing. Was there.

[Problems to be solved]

Even if air is sent from the air inlet 102 with such a conventional device, the air is difficult to enter between the discontinuation 100 and the rubber product, and the product may be broken or the bellows length dimension cannot be secured at a place where it is not separated by air. Was occurring. In addition, the work efficiency was poor because the product was taken out from the air injection through the acquisition.

Therefore, an object of the present invention is to provide a rubber product manufacturing apparatus in which air can reliably enter and the core and the product can be reliably separated to manufacture a complete product, and can be automated without having to obtain the product.

[Means for solving problems]

In order to achieve the above-mentioned object, the core is slidable with respect to the core cylinder through the core cylinder and this axis, and its tip is
It consists of a shaft forming the inner surface of the cylindrical part having a smaller inner diameter among the above cylindrical parts, the tip of the shaft is formed to project beyond the core cylinder, and a gas injection port is formed on the base end side of the shaft. A gas outlet is provided in the vicinity of the fitting portion where the tip end side of the shaft and the core cylinder are in close contact with each other in a sealed state, and a passage is formed between the gas inlet and the gas outlet. Formed in the step between the shaft and the core tube, after rubber vulcanization, the upper and lower molds are separated, the shaft is slid toward the tip side, and gas is sent from the gas outlet to the inner surface of two or more cylinder parts. It is configured such that the vulcanized rubber is peeled from the rubber.

[Action]

In this invention, the core tube and the shaft are integrated during rubber vulcanization, and when the gas is injected after vulcanization, the shaft slides and directs the gas sent from the passage of the shaft toward the gas outlet. By discharging the gas, the gas is surely sent into the two or more cylindrical body parts.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, rubber is vulcanized in the gap between the inner surfaces of the upper and lower molds 3 and 4 and the outer surface of the core 5 to form two or more cylindrical body parts 1 having different inner diameters.
2 is formed, and a rubber product having a large inner diameter and a thin cylindrical body portion 2 is manufactured. The core 5 is composed of a core cylinder and a shaft body 7 which is slidable with respect to the core cylinder 6 and which has an end portion 7A forming the inner surface of the cylindrical body portion 1 having a small inner diameter. . A gas injection port 8 is provided on the base end side of the shaft body 7, and a gas discharge port 10 is provided in the vicinity of a fitting part 9 where the tip end portion 7A side of the shaft body 7 and the core tube 6 closely adhere in a sealed state. A passage 11 for passing gas is formed between the gas inlet 8 and the gas outlet 10. A spring 12 is provided as a means for constantly biasing the shaft body 7 so that the tip portion 7A side of the shaft body 7 is fitted into the fitting portion 9 in a sealed manner. The spring 12 is provided in the housing portion 5A formed in the core cylinder 6, and one end side thereof collides with the flange portion 13 provided on the base end side of the shaft body 7, and this flange portion 13 is in the left-hand direction in the drawing. Is always in pressure contact with. On the gas injection port 8 side of the shaft body 7, a connection cap 14 for sending the gas sent from a gas injection machine (not shown) to the core tube 6 is attached to the gas injection port 8. A hose or the like of a gas injecting machine is connected to the connection cap 14. Also,
A supply passage 15 for supplying a rubber material is formed in the upper mold 3, and the rubber material is injected into the gap between the upper and lower molds 3 and 4 and the core 5 from these supply passages 15. To be done. In addition,
A member indicated by reference numeral 16 in the figure is a member for pulling out the core 5 in the left-hand direction in FIG. 1 after separating or opening the upper and lower molds 3 and 4. Using the manufacturing apparatus as shown in FIG. 1, a bellows-integrated bump stopper in which a bellows portion is formed on the cylindrical portions 1 and 2 is formed. When the rubber is vulcanized, since the core cylinder 6 and the shaft body 7 are in close contact with each other, the rubber does not protrude even if the core 5 is divided into two parts. After the rubber is vulcanized, the upper and lower molds 3,
4 is separated by the usual means, the shaft 7 is slid toward the tip 7A side, gas is sent from the gas outlet 10 to the inner surfaces of the cylindrical parts 1 and 2, and the vulcanized rubber is separated from the core 5. . This is as shown in FIG. In this embodiment, when gas is sent from the hose passage connected to the connection cap 14, the gas travels from the gas inlet 8 through the passage 11 to the gas outlet 10 and hits the flange portion 13 to cause the shaft 7 to move. Slide to the right. At this time, the pressure of the gas is reduced at the beginning of the fitting portion 9 because the core cylinder 6 and the shaft body 7 are in a hermetically sealed state, so that all of them collide with the flange portion 13 and resist the pressing force of the spring 12. Let When the spring 12 contracts and the shaft body 7 slides toward the tip portion 7A, a gap 9A as shown in FIG. 2 is created between the fitting portion 9 and the shaft body 7, and the gas is discharged from the gas discharge port 10 through this gap. The gas is sent to the side of the tubular portion 1 and the side of the tubular portion 2 through 9A, and the tubular portion 2 having a particularly thin wall is inflated. As shown in FIG. 2, while the gas was fed to separate the vulcanized rubber from the core 5, the gas was continued to be injected and the member 15 was moved to pull out the core 5 from the product. Rubber products can be manufactured. If the gas injection is stopped after pulling out the core 5,
The shaft body 7 is returned by the force of the spring 12, and the shaft body 7 and the core cylinder 6 are sealed again to be ready for the next vulcanization.

The member 16 can be moved by pulling the member 16 in the left-hand direction using a hydraulic cylinder or the like as shown in FIG. Also,
When pulling out the core 5, the chuck 17 holds the flange portion 1A formed on the front end side of the cylindrical body portion 1 in advance. The chuck 17 can be moved up and down in the drawing.

〔effect〕

As described above, according to the present invention, the core body is slidable with respect to the core cylinder and the core cylinder, and the tip of the shaft body forms the inner surface of the cylinder body portion having a small inner diameter. And a gas inlet is provided at the base end side of the shaft body, and a gas outlet is provided near the fitting portion where the tip end side of the shaft body and the core cylinder are in close contact with each other in a sealed state. A passage is formed between the exhaust port and the rubber vulcanization, the upper and lower molds are separated, the shaft is slid toward the tip side, and gas is sent from the gas exhaust port to the inner surface of two or more cylinders and vulcanized from the core. Since the tip end of the shaft body is formed so as to protrude from the core cylinder and the fitting portion is formed at the step between the shaft body and the core cylinder, As described above, the gas does not reach the inside of the product, and the gas is sent and the core is then withdrawn. Automation also becomes possible. Further, in the case where the thin-walled tubular portion is formed in a bellows shape, it is possible to reliably manufacture the thin-walled bellows without breaking the thin bellows or changing the dimensions. In addition, the shaft body is always biased so that the tip end side of the shaft body fits in the fitting part in a sealed manner, and the flange portion is provided on the base end side of the shaft body so that not only the gas injection port In the structure in which the shaft is also fed into the collar and the shaft is slid by the pressure of the gas to feed the gas from the gas outlet to the inner surface of the two or more cylinders, it is not necessary to provide a separate slide means for the shaft. Therefore, labor saving can be further achieved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an outline of the whole, FIG. 2 is a partial sectional view in a state of feeding gas, and FIG. 3 is a sectional view showing a means for pulling out a core after feeding gas.
FIG. 4 is a sectional view showing a conventional example. 1,2 ... Cylinder part 3 ... Upper mold, 4 ... Lower mold, 5 ... Core, 6 ... Core cylinder, 7 ... Shaft, 7A ... Tip, 8 ... Gas injection Inlet, 9 ... Fitting part, 10 ... Gas outlet, 11 ... Passage.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area B29L 23:18 31:30

Claims (2)

[Claims] 1. A vulcanization of rubber in a gap between an inner surface of an upper die and a lower die (3, 4) and an outer surface of a core (5) to have two or more tubular portions (1, 2) having different inner diameters. In a device for manufacturing a rubber product having a large inner diameter cylindrical body portion (2) having a small wall thickness, a core (5) is passed through the core cylinder (6) and this axis center with respect to the core cylinder (6). The tip portion (7A) is slidable and comprises a shaft body (7) forming the inner surface of the tubular body portion (1) having the small inner diameter, and the tip portion (7A) of the shaft body (7) is a core tube ( 6) is formed so as to project more than 6), a gas inlet (8) is provided on the proximal end side of the shaft body (7), and the tip end (7A) side of the shaft body (7) and the core tube (6) are sealed. The gas outlet (10) is provided in the vicinity of the fitting portion (9) that is in close contact with each other, and the passage (11) is formed between the gas inlet (8) and the gas outlet (10). (9) is a combination of the shaft body (7) and the core tube (6). After the rubber is vulcanized, the upper and lower molds (3, 4) are separated and the shaft (7) is slid toward the tip (7A) side from the gas outlet (10).
A core (5) for feeding gas into the inner surface of the cylindrical body (1, 2)
A rubber product manufacturing apparatus, characterized in that it is configured to peel off vulcanized rubber from the rubber product. 2. The shaft body (7) is always biased so that the tip end (7A) side of the shaft body (7) is fitted into the fitting portion (9) in a sealed manner, and the shaft body (7) is ) Providing a flange on the base end side,
The gas is sent not only to the gas inlet (8) but also to the flange, and the shaft (7) is slid by the pressure of the gas to discharge the gas (10).
2. The rubber product manufacturing apparatus according to claim 1, wherein the gas is sent from the inside to the inner surfaces of the two or more tubular portions (1, 2).