JPS6021538B2 - Cordless tire manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cordless gear manufacturing apparatus.

Currently, a typical pneumatic tire consists of a pair of bead sections, a carcass member that is wrapped around the bead sections at both ends and supports the strength of the tire, a tread section, and side sections.

The method for making these pneumatic tires is that in the tire molding process, a carcass part is wrapped around a molding drum, a bead member is set, and then the carcass part is wrapped around a bead member and sufficiently crimped, and then the tread part and sidewall part are It is common knowledge in the industry that a raw cover can be obtained through the process of pasting.

This molding process is an extremely important process in demonstrating the tire's performance, requires skilled workers, and due to the nature of the work, it is difficult to improve productivity, and it determines tire production capacity. This is an important process.

Furthermore, the carcass component accounts for a large proportion of the cost of tire constituent materials, and by eliminating this carcass component, it is expected that the cost will be significantly reduced.

On the other hand, if we look at the usage conditions of tires, there are low internal pressure leisure and agricultural tires that do not require general pneumatic tires that require such complicated processes and costly carcass parts. Many low internal pressure cordless tires have been proposed as special-purpose tires, but all of them require complex production equipment or special rims, and the bead and rim must be closely connected throughout the entire process of use. There were drawbacks such as the inability to maintain airtightness.

The present invention has been made in view of these problems,
To provide a simple device for manufacturing and producing an excellent cordless star.

Hereinafter, the cordless gear according to the present invention and the cordless gear manufacturing apparatus according to the present invention will be described in detail, but the present invention is not limited thereto. That is, as shown in FIG. 1 and described later, in the cordless gear according to the present invention, the bead east 26 of one bead part 30' is sulfurized, and the bead wire bundle is attached to the other bead part 30' during rim assembly. 2
6' is provided with a recessed portion 31' into which the device 6' can be attached.

Such a cordless star has the following advantages.

■ Existing rims can be used without the need for special rims.

■ Tire material costs can be reduced because there is no carcass component.

■ The bead wire is attached to the bead on one side by sulfuric acid, so the rim is out of place and looks bulky.

■ Tire manufacturing is facilitated by reducing the difficult and skill-intensive setting of bead wire bundles to the bead portion and the tempering and gluing process.

The above-described cordless star can be manufactured using the following apparatus of the present invention.

4. FIG. 2 is a schematic vertical sectional front view of the device of the present invention, and FIG. 3 is an enlarged right sectional view (Figure a) and a plan view (Figure b) of the coring portion of the device in FIG. 2.
In FIG. 2, 1 is an upper mold, 2 is a lower mold, 3 is a core mold, 4 is a core ring, 5 is a cylinder for the core mold, 6 is a cylinder for the core ring, and 7 is a main ram.

Each cylinder is arranged so that it can be operated independently via a control device (not shown). In addition, the inner cavity 10 of the core mold 3, the upper mold 1, and the lower mold 2
, 8 and 9, high-pressure heating steam is introduced by means not shown to supply heat energy.

Further, as shown in FIGS. 2 and 3, the coring 4 is connected to the piston rod 13 of the core ring cylinder 6 and the locking mechanism 25.
The core ring 4 is embedded with a plurality of permanent magnets 24 in order to prevent the groove portion 23 for attaching the bead wire east and the attached bead wire east from falling.

The operating sequence of the above device of the present invention is as follows.

First, oil is introduced into the inner chamber 19 of the coring cylinder via a hydraulic circuit (not shown) to raise the coring cylinder piston 15, thereby raising the core ring 4 connected to the coring piston rod 13. . A lever (not shown) is pressed before the core ring 4 comes into contact with the core mold 3.
Operate to stop the rise of coring 4.

Next, the lock mechanism 25 is released, the core ring 4 is removed from the piston rod 13 of the core ring cylinder 6, and the bead wire 26 is installed in the groove 23 of the core ring 4. The inside (BW) of this groove part 23 is slightly narrower than the inside of the Beedwaya East to be used, so that the Beedwaya East can be firmly held. Furthermore, a plurality of permanent magnets 24 are arranged on the bottom surface of the groove 23, making it possible to securely hold the bead wire in the groove 23. After the bead wire is installed in the groove 23 of the core ring 4, it is connected to the piston rod 13 again via the lock mechanism 25.

) to operate the coring cylinder 6 and remove the core ring 4.
and the inner chamber 1 of the core mold cylinder 5.
6 through a hydraulic circuit (not shown), and the core mold 3 is lowered.

When the core mold 3 and the core ring 4 come into contact, the diameter of the piston 15 of the core ring cylinder 6 is made smaller than the diameter of the piston 14 of the core mold cylinder 5, so the same hydraulic pressure is applied to each inner chamber. 16 and 19, the core mold 3 and core ring 4 remain in contact with each other and descend to the full stroke of the core mold cylinder 5. Next, the joint part 11 of the lower mold 2
A preliminarily measured amount of vulcanized rubber material is placed in the chamber 7, and then oil is introduced into the chamber 33 of the main ram 7 via a hydraulic circuit (not shown) to raise the lower mold.

At this time, the diameter of the piston 14 of the core mold cylinder 5 is made larger than the cylinder diameter of the main ram 7, so the core mold 3, core ring 4, and lower mold 2 are They will rise as a whole while being pressed together. When the upper mold 1 and the lower mold 2 approach each other, the raw rubber member placed at the joint 11 of the lower mold 2 gradually connects the upper mold 1, the lower mold 2, the core mold 3, and the core. It is pushed into the cavity created by the ring 4 that forms the tire shape as shown in FIG.

In this way, appropriate pressure is applied to the rubber members tightened by the upper mold 1 and the lower mold 2, and the hollow parts 8 of the upper mold 1, the lower mold 2, and the core mold 3 ,9,1 The vulcanization reaction of the unvulcanized rubber member progresses due to the thermal energy of the high-pressure heated steam introduced, and the rubber member and the rubber member are firmly vulcanized and vulcanized. When worn, the rubber properties necessary for a cordless star with low internal pressure can be obtained.

Next, we will show how to take out the tire after vulcanization is complete.

First, the hydraulic circuit of the coring cylinder 6 is switched to the lowered position to introduce oil into the empty chamber 18. Next, when the main ram 7 is lowered, the lower mold 2, core mold 3, and core ring 4 unite and descend while sandwiching the vulcanized tire between their cavities, thereby removing the vulcanized tire from the upper mold 1. You can draw a sword. Next, when the stroke of the core mold cylinder 5 becomes full, the core mold 3 stops.

However, since the core ring 4 lower mold 2 further descends, the vulcanized tire comes off from the core mold 3. Here, the core mold 3 is raised, the core ring 4 is raised to an appropriate position, and the piston rod 13 of the core ring cylinder 6 and the core ring 4 are released from the locking mechanism 25 to take out the tire from the molding equipment. can. After that, the core ring 4 remaining inside the tire is taken out from the upper bead part of the tire, and a low internal pressure cordless tire having a bead wire 26 firmly vulcanized and bonded to one bead part can be obtained. Ru.

Also, since the upper bead portion of the core mold 3 has a convex portion 27 so that the bead wire east can be attached, the bead wire east can be attached to the groove of the tire when assembling the rim.
As shown in Fig. 1, the tire thus obtained consists of a tread 28, a sidewall 29, bead parts 30, 31', and a pea wire east 26. Recessed part 3 for mounting
1' is arranged.

The tread 28 is also provided with a suitable pattern.
Also, from the tire's maximum middle straightness (RW) to the bead portions 30, 31
The rubber thickness of the side portion 29 extending to ' is gradually increased so as to maintain the tire shape even when the internal pressure is low. Rim and bead part 30,3
0', the ridge RB of the bead seat part 32 of the tire is smaller than the rim ridge, and the distance a between the bead east 26 and the bead seat part 32 is made larger than that of a general pneumatic tire. (The distance between Peedo East 26' and the bead seat on that side is also the same as that of the aircraft). For this reason, so-called bead compression becomes tight, and airtightness between the rim and the bead portion can be maintained sufficiently when running at low internal pressure. The apparatus of the present invention as described above has the following advantages.

■ Obtain cordless gear without requiring complicated processes.

■ Does not require skilled workers required for general tire molding processes.

■ Because it is molded, there is no unevenness in the thickness of each part of the tire, and the desired shape for a cordless tire can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of the cordless star according to the present invention, Fig. 2 is a schematic diagram of the entire device of the present invention and is a longitudinal sectional front view, and Fig. 3 is a right sectional view of the core ring in Fig. 2. (Figure a) and a plan view (Figure b) are shown as examples.

1... Upper mold, 2... Lower mold, 3... Core mold, 4... Core ring, 5... Cylinder for core mold, 6... Cylinder for core ring, 7. ...Main ram, 8, 9, 10...Inner cavity, 1
1...Joint part of upper mold and lower mold,
12... Piston rod for core mold, 13... Piston rod for core ring, 14... Cylinder piston for core mold, 15... Cylinder piston for core ring, 16, 17, 18, 19... Inner chamber, 20... ...Upper mold mounting board, 21...Lower mold mounting board, 22...Rubber section, 23...Groove section,
24...Permanent magnet, 25...Lock mechanism,
26, 26'...Beedwaya East, 27...Convex part,
28...Tread, 29...Side wall, 30,3
0'...Bead part, 31'...Concave part, 32...
...Bead seat section, 33...vacant room.

O diagram Figure 3 Figure 2

Claims (1)

[Claims] 1 Upper mold 1, lower mold 2, and core mold 3
and a core ring 4, the core mold 3 can be moved up and down by a core mold cylinder 5,
The core ring 4 can be moved up and down by a core ring cylinder 6, and the lower mold 2 can be moved up and down by a main ram 7. The diameter of the piston 15 is smaller than the diameter of the piston 14 of the core mold cylinder 5.
The diameter of the core mold 3 is smaller than that of the main ram 7, and the core mold 3 has a convex portion 27 at its upper end that forms a recess for attaching a bead wire bundle to the tire. It has a groove 23 at its lower end into which a bead wire bundle is attached, and is detachable via the piston rod 13 of the coring cylinder 6 and a locking mechanism 25 so that the bead wire bundle can be attached to this groove 23. A bead wire bundle is attached to the groove 23 of the core ring 4, and an unvulcanized rubber member is formed in the tire-shaped cavity formed by joining the upper mold 1, lower mold 2, core mold 3, and core ring 4. A cordless tire manufacturing device characterized by being able to vulcanize. 2 Groove portion 23 for attaching the bead wire bundle of core ring 4
The cordless tire manufacturing apparatus according to claim 1, wherein a permanent magnet 24 for preventing the bead wire bundle from falling is embedded in the upper side.