JPS63158206A - Production equipment for rubber product - Google Patents

Abstract

PURPOSE:To make it possible to surely separate a core from a product so as to manufacture the perfect product and, in addition, to automate its manufacture by a method wherein a top and a bottom forces are separated from each other after the vulcanization of rubber, and gas is fed to the inner surfaces of two or more cylindrical parts through gas exhaust ports by sliding a shaft to a top part side. CONSTITUTION:A core 5, which is surrounded in a top and a bottom forces 3 and 4, consists of a core cylinder 6 and a shaft 7, which passes through the axis center of the core cylinder 6 so as to be able to slide onto the core cylinder 6 and the tip part 7A of which forms the inner surface of a cylindrical part 1 having a smaller inner diameter. A gas inlet port 8 is provided on the basic end side of the shaft 7, while gas exhaust ports 10 are provided near a fitting part 9, at which the tip part 7A side of the shaft 7 and the core cylinder 6 contact each other under sealed state. In addition, a passage 11, through which gas passes, is formed between the gas inlet port 8 and the gas exhaust ports 10. After the vulcanization of rubber, the top and the bottom forces 3 and 4 are separated from each other, and gas is fed to the inner surfaces of the cylindrical parts 1 and 2 from the gas exhaust ports 10 by sliding the shaft 7 to the tip part 7A side in order to separated vulcanized rubber from the core 5. A finished rubber product can be manufactured by drawing the core 5 out of the product.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a method of vulcanizing rubber in the gap between the inner surfaces of upper and lower molds and the outer surface of a core to form two or more cylindrical portions with different inner diameters. The present invention relates to an apparatus for manufacturing a rubber product having a large inner diameter cylindrical body with a thin wall thickness, such as a bellows-integrated bump stopper used for automobiles.

[Conventional technology]

As shown in FIG. 4, the conventional manufacturing device has two or more cylindrical body parts 1.2 having different inner diameters by vulcanizing rubber in the gap between the inner surface of the upper and lower molds and the outer surface of the core 100. The company was manufacturing a bellows-integrated bump stopper in which the cylindrical body part 2 had a large inner diameter and had a thin wall. After the rubber is vulcanized, the upper and lower molds are opened, and then the tip side of the cylindrical body part 1 is sandwiched between the hexagonal split claws 101, and air is injected from the tip side of the split claws 101 to separate the cylindrical body parts 1, 2 and the core. 100 to separate the rubber product from the core 100, and then the core 100 was pulled out to the left in the drawing.

[Problem to be solved]

Even if air is sent from the air inlet 102 using such a conventional device, it is difficult for the air to sufficiently enter between the core 100 and the rubber product, and if air is not used to separate the product, the product may be torn or the length of the bellows cannot be secured. An inconvenience was occurring. In addition, since air injection and product removal were performed manually, work efficiency was poor.

Therefore, an object of the present invention is to provide a rubber product manufacturing apparatus that allows air to enter reliably, reliably separates the core from the product, and manufactures a complete product, and that can be automated without manual intervention.

[Means for solving problems]

In order to achieve the above-mentioned purpose, the core can be slid relative to the core cylinder through the axis of the core cylinder, and its tip has two parts.
It consists of a shaft that forms the inner surface of the cylinder with a smaller inner diameter among the above cylinders, and a gas inlet is provided on the base end of the shaft, and the tip side of the shaft and the core cylinder are in a sealed state. A gas outlet is provided near the fitting part where they come into close contact with each other to form a passage between the gas inlet and the gas outlet. After rubber vulcanization, the upper and lower molds are separated and the shaft body is slid toward the tip side to release the gas. The structure is such that gas is fed into the inner surface of two or more cylindrical parts from the discharge port to peel off the vulcanized rubber from the core.

[Effect]

In this invention, the core cylinder and the shaft are integrated during rubber vulcanization, and when gas is injected after vulcanization, the shaft slides to direct the gas fed from the passage in the shaft toward the gas outlet. By discharging the gas, the gas is reliably sent into the interior of the two or more cylindrical parts.

〔Example〕

Preferred embodiments 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 surface of the upper and lower molds 3.4 and the outer surface of the core 5 to form two or more cylindrical portions 1.2 with different inner diameters, and a cylindrical body with a larger inner diameter is formed. Rubber products are manufactured in which the wall thickness of part 2 is thin. The core 5 consists of a core cylinder 6 and a shaft body 7 which is slidable relative to the core cylinder 6 through its axis and whose tip 7A forms the inner surface of the cylinder body part 1 having a small inner diameter. There is. A gas inlet 8 is provided on the base end side of the shaft body 7, and a gas outlet port 10 is provided near the fitting part 9 where the tip end 7A side of the shaft body 7 and the core tube 6 are in close contact with each other in a sealed state. A passage 11 through which gas passes is formed between the gas inlet 8 and the gas outlet 10. The shaft body 7 is inserted so that the tip end 7A side of the shaft body 7 is tightly fitted into the fitting part 9.
A spring 12 is provided as a means for always biasing.

This spring 12 is attached to a housing portion 5A formed in the core cylinder 6.
One end side collides with a flange 13 provided on the proximal end side of the shaft body 7, and the flange 13 is always pressed against the flange 13 in the left-hand direction -1 in the drawing. A connecting cap 14 is attached to the gas inlet 8 side of the shaft body 7 for feeding gas sent to the core cylinder 6 from a gas injector (not shown) to the gas inlet 8. A hose of a gas injector, etc. is connected to this connection camp 14. Further, supply passages 15 for supplying rubber material are formed in the upper mold 3, and the rubber material is supplied from these supply passages 15 to the gap between the upper and lower molds 3, 4 and the core 5. injected into. A member indicated by reference numeral 16 in the figure is a member for pulling out the core 5 in the power direction in FIG. 1 after the upper and lower molds 3 and 4 are separated or opened. A bellows-integrated humps bar with bellows parts formed on the cylindrical body parts 1 and 2 is formed using a manufacturing apparatus as shown in FIG.

Since the core tube 6 and the shaft body 7 are in close contact with each other during vulcanization of the rubber, no rubber protrudes even if the core 5 is divided into two parts. After the rubber is vulcanized, the upper and lower molds 3.4 are separated using normal means, and the shaft body 7 is slid toward the tip 7A side, allowing gas to flow from the gas outlet 10 to the inner surface of the cylindrical body part 1.2. The vulcanized rubber is peeled off from the feeding core 5. This is as shown in FIG. In this embodiment, when gas is fed from a hose or the like connected to the connection cap 14,
The gas passes from the gas inlet 8 through the passage 11 to the gas outlet 1.
As it moves toward 0, it collides with the flange portion 13, causing the shaft body 7 to slide toward the right. At this time, the gas pressure initially hits the flange 13 at the fitting part 9 because the core cylinder 6 and shaft body 7 are in a sealed state, and is reduced against the pressing force of the spring 12. let When the spring 12 contracts and the shaft 7 slides toward the tip 7A, a gap 9A as shown in FIG. 2 is created between the fitting part 9 and the shaft 7, and gas flows from the gas outlet 10 into this gap. Gas is sent to the cylindrical portions l and 2 through 9A, and the cylindrical portion 2, which has a particularly thin wall, is inflated. As shown in Figure 2, the core 5 was completed by injecting gas to peel off the vulcanized rubber from the core 5, and then continuing to inject the gas and moving the member 15 to pull out the core 5 from the product. Rubber products can be manufactured. When the injection of gas is stopped after the core 5 has been punched out, the shaft 7 is returned by the force of the spring 12, and the shaft 7 and the core cylinder 6 are again in a sealed state, ready for the next vulcanization.

The member 16 can be moved by pulling the member 16 toward the left using a hydraulic cylinder or the like, as shown in FIG. Further, when pulling out the core 5, the flange portion IA formed at the tip side of the cylindrical portion l is gripped by the chuck 17.

This chuck 17 is movable up and down in the drawing.

〔effect〕

As explained above, according to the present invention, the core can be slid relative to the core cylinder through the axis of the core cylinder, and the shaft body has a tip portion that forms the inner surface of the cylinder body having a small inner diameter. A gas inlet is provided on the base end side of the shaft body, and a gas outlet is provided near the fitting part where the tip side of the shaft body and the core cylinder come into close contact with each other in a sealed state. A passage is formed between the gas outlet and the upper and lower molds after the rubber is vulcanized, the upper and lower molds are separated, the shaft is slid toward the tip, and gas is sent from the gas outlet to the inner surface of two or more cylindrical bodies to vulcanize from the core. Since the rubber is peeled off, there is no longer a problem in which gas does not reach inside the product as in the past, and it is also possible to automate the feeding of gas and the subsequent removal of the core.

Further, in the case where the cylindrical body portion is formed into a bellows shape with a thin wall, it is possible to reliably manufacture the bellows with a thin wall without tearing the bellows or out of dimension. In addition, the shaft is always biased so that the distal end of the shaft fits into the fitting part in a sealed manner, and a flange is provided on the base end of the shaft to supply gas not only to the gas inlet but also to the fitting part. If the structure is such that gas is fed into the flange and the shaft is slid by the pressure of the gas, and gas is sent from the gas outlet to the inner surface of two or more cylindrical parts, there is no need to provide a separate shaft sliding means. , further labor savings can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the overall outline, FIG. 2 is a partial cross-sectional view in a state where gas is pumped in, and FIG. 3 is a cross-sectional view showing a means for pulling out the core after gas is pumped in.
FIG. 4 is a sectional view showing a conventional example. 1.2... Cylinder part, 3... Upper die, 4... Lower die, 5... Core, 6... Core tube, 7... Shaft body, 8... Gas inlet, 9... Fitting portion, 10... Gas outlet, 11... Passage.

Claims (1)

[Claims] 1. Rubber is vulcanized in the gap between the inner surface of the upper and lower molds and the outer surface of the core to form two or more cylindrical portions with different inner diameters, and the wall thickness of the cylindrical portion with the larger inner diameter. In an apparatus for manufacturing thin rubber products, the core is slidable relative to the core cylinder through its axis, and the tip thereof forms the inner surface of the cylindrical body having the small inner diameter. A gas inlet is provided at the proximal end of the shaft, and a gas outlet is provided near the fitting part where the tip end of the shaft and the core cylinder come into close contact with each other in a sealed state. A passage is formed between the mold and the outlet, and after the rubber is vulcanized, the upper and lower molds are separated, the shaft is slid toward the tip, and gas is sent from the gas outlet to the inner surface of two or more cylindrical parts, and the core is vulcanized. A rubber product manufacturing device characterized in that it is configured to peel off rubber. 2. The shaft must always be biased so that the distal end of the shaft fits into the fitting part in a sealed manner, and a flange is provided on the base end of the shaft so that gas can be supplied only to the gas inlet. 2. The rubber product manufacturing apparatus according to claim 1, wherein the gas is fed into the flange portion and slides the shaft body under the pressure of the gas to feed gas from the gas outlet to the inner surface of the two or more cylindrical portions.