JPH09239735A - Vulcanizing mold and method for molding solid tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent appearance inferiority by preventing the breakage of rubber. SOLUTION: An upper mold 3 having an upper mold 1 and the upper tread ring 2 forming a tire tread pattern part provided to the upper mold 1 and a lower mold 6 having a lower mold 4 and the lower tread ring 5 forming the tire tread pattern part provided to the lower mold 4 are provided. The upper and lower tread rings 2, 5 consist of a plurality of upper and lower segments 7, 8 arranged in a peripheral direction. The upper segment 7 slides outwardly in a diameter direction while falls with respect to the upper mold 1 accompanied by the rising of the upper mold 1. The upper pressure pin 37 pressed downwardly by an elastic member 36 to protrude toward the lower tread ring 5 is provided to the upper segment 7 and brought into contact with the lower tread ring 5 before raw rubber is crushed to mount the upper segment 7 on the upper mold 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid tire vulcanizing mold and a vulcanizing method for producing a solid tire.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, a solid tire is roughly preliminarily rough-molded in a space d of a mold a composed of an upper mold b and a lower mold c with a tire equator as a dividing surface f. After inserting the raw tire, the upper mold b and the lower mold c are closed, and the raw tire is vulcanized and molded by the mold a. Further, the vulcanized solid tire is By opening the upper mold b and the lower mold c again, it is taken out from the space d.

[0003]

However, when the solid tire vulcanized and molded by the mold a is taken out from the mold a, the convex portion g for forming the groove of the mold a is taken out.
There is a problem in that the friction resistance with the tire tends to be large, the tire cannot be taken out easily, and rubber cracks or the like are likely to occur in the completed solid tire due to contact with the mold a, thereby impairing the appearance of the completed tire. It was

[0004] As means for solving such problems,
For example, the mold may be divided into 8 to 9 by the radial dividing surface of the tire.
It has been proposed to make a so-called split mold that is divided into individual pieces and is composed of segments that can be expanded and contracted in the radial direction.

However, such a split mold is
The structure of the operating mechanism and the vulcanization device is extremely complicated, making it an expensive device, and since each segment shrinks while crushing the raw tire, a large amount of rubber sticks out between the split surfaces of the segment and it is completed. The appearance of the tire may be impaired, and the above problems have not been resolved.

[0006] Therefore, an object of the present invention is to provide a vulcanization mold for solid tire molding and a vulcanization method capable of preventing a defective appearance such as rubber chipping and being inexpensively manufactured by a simple mechanism. To do.

[0007]

In order to achieve the above object, a solid tire vulcanizing mold of one aspect of the present invention is to form an upper mold and a tire tread pattern portion attached to the upper mold. An upper die having an upper tread ring, a lower die having a lower die and a lower tread ring attached to the lower die to form a tire tread pattern portion, and each upper and lower treads. A vulcanization mold for solid tire molding, comprising a plurality of upper and lower segments each having a plurality of rings arranged in the circumferential direction, wherein the upper segment descends with respect to the upper mold as the upper mold rises, The upper segment is attached to the upper mold so as to slide in one direction, and the upper segment is pressed downward by the elastic member to project to the lower tread ring side and hit the lower tread ring before crushing the raw tire. Touch above the above segment The pressure pin on which is mounted to the upper die of cement is obtained by attached to the upper segment.

[0008] Another solid tire vulcanization mold is an upper mold having an upper mold and an upper tread ring attached to the upper mold for forming a tire tread pattern portion, and a lower mold. A lower mold having a lower tread ring for forming a tire tread pattern portion attached to the lower mold, and from upper and lower segments in which a plurality of upper and lower tread rings are respectively arranged in the circumferential direction. A vulcanization mold for forming a solid tire, wherein the upper segment is slid radially outward while the upper segment descends with respect to the upper die as the upper die rises. Attached, and
An upper pressing pin that is pressed downward by the elastic member to project to the lower tread ring side is attached to the upper segment, and is pressed upward by the elastic member to project to the upper tread ring side and to the upper pressing pin. A lower pressing pin that abuts is attached to the lower segment. At this time, it is preferable to provide one or more upper pressing pins on each of the upper segments.

Further, the solid tire vulcanizing method according to the present invention comprises an upper mold having an upper mold and an upper tread ring attached to the upper mold for forming a tire tread pattern portion, a lower mold and a lower mold. A lower mold attached to the lower mold and having a lower tread ring for forming a tire tread pattern portion, and each of the upper and lower tread rings comprises a plurality of upper and lower segments arranged in the circumferential direction. A solid tire vulcanizing method using a vulcanizing mold for molding, wherein, before crushing raw rubber, the upper pressing pin abuts the lower tread ring, and the upper segment is mounted on the upper mold, and then , Vulcanize the raw rubber with the mold closed, and then
The vulcanized tire is taken out after the upper segment and the lower die are separated from each other and the upper segment is slid radially outward with respect to the upper die to be opened.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a vulcanizing mold for molding a solid tire according to the present invention, which comprises an upper mold 3 having an upper mold 1 and an upper tread ring 2 attached to the upper mold 1. , A lower die 6 having a lower die 4 and a lower tread ring 5 attached to the lower die 4. Also, the upper tread ring 2
Is for forming a tire tread pattern portion, and as shown in FIG. 3, a plurality of tire tread pattern portions are provided in the circumferential direction (eight in the illustrated example, but of course, the number can be increased or decreased). The upper segments 7 ... Are arranged. The lower tread ring 5 is also for forming a tire tread pattern portion, and is formed by arranging a plurality of (eight) lower segments 8 ... In the circumferential direction like the upper tread ring 2.

Thus, the upper mold 1 is provided with the concave circumferential groove 9 into which the upper tread ring 2 is fitted, and the peripheral surface 10 of the concave circumferential groove 9 is gradually expanded downward in diameter, and , This surface
A plurality of grooves 11 are provided at 10 at a predetermined pitch along the circumferential direction. As shown in FIG. 2, the groove 11 is composed of a first groove 12 having a substantially trapezoidal cross section and a second groove 13 having a substantially rectangular cross section which is connected to and communicated with the first groove 12. The slide key 14 of the upper segment 7 is fitted.

That is, the slide key 14 has the upper segment 7
Is attached to the outer surface 15 (the outer surface 15 is an inclined surface corresponding to the inclination of the peripheral surface 10 of the concave circumferential groove 9) and is attached to the main body 16 having a substantially trapezoidal cross section and the outer surface 17 of the main body 16. And a sub-block piece 18 having a substantially rectangular cross section. In this case, as shown in FIG. 1, in the slide key 14, the main body 16 is fixed to the upper segment 7 by fasteners 19, 19 such as bolts.
18 is fixed to the main body 16 and the upper segment 7 by a fixing tool 20 such as a bolt. The main body 16 is slidably fitted in the first groove 12 of the groove 11, and the sub block piece 18 is slidably fitted in the second groove 13. A stopper piece 21 is fixed to the lower surface of the upper die 1 on the outer peripheral side.

Therefore, the upper segment 7 is slidably attached to the upper mold 1. That is, when the upper die 1 rises, the upper segment 7 descends with respect to the upper die 1 and slides radially outward, resulting in the state shown in FIG. Further, in the state shown in FIG. 4B, the sub block piece 18
Comes into contact with the stopper piece 21, and the upper segment 7 does not come off from the upper mold 1.

Further, the lower mold 4 is also provided with a concave circumferential groove 22 into which the lower tread ring 5 is fitted, and a peripheral surface 23 of the concave circumferential groove 22.
Has a diameter that gradually increases in the upward direction, and a plurality of grooves 24 are provided on the peripheral surface 23 at a predetermined pitch along the circumferential direction. Similar to the groove 11, the groove 24 is composed of a first groove 25 having a substantially trapezoidal cross section and a second groove 26 having a substantially rectangular cross section which is connected to and communicates with the first groove 25. The slide key 27 of the segment 8 is fitted.

That is, the slide key 27 has the lower segment 8
Attached to the outer surface 28 (the outer surface 28 is an inclined surface corresponding to the inclination of the peripheral surface 23 of the concave circumferential groove 22) and the main body 29 having a substantially trapezoidal cross section and the outer surface 30 of the main body 29. And a sub block piece 31 having a substantially rectangular cross section. In this case, in the slide key 27, the main body 29 is fixed to the lower segment 8 by fasteners 32, 32 such as bolts, and the sub-block piece 31 is fixed to the main body 29 and the lower segment 8 by fasteners 33 such as bolts. To be done. The main body 29 is slidably fitted in the first groove 25 of the groove 24, and the sub block piece 31 is slidably fitted in the second groove 26. Also, on the outer peripheral side upper surface of the lower mold 4, the stopper piece 34
Is fixed.

Therefore, the lower segment 8 slides up and down with respect to the lower mold 4, and when it rises, slides radially outward. Further, when the lower segment 8 rises, the sub block piece 31 of the slide key 27 does not come into contact with the stopper piece 34 and the lower segment 8 does not come off from the lower mold 4.

By the way, the upper segment 7 includes elastic members.
It is pressed downward by the elastic force of 36, and
As shown in FIG. 1 and the like, an upper pressing pin 37 protruding toward the lower tread ring 5 side is attached. As the upper pressing pin 37, one to several pieces are arranged in each upper segment 7. (In the example shown in the figure, only one is shown.) That is, as shown in FIG. 1, the upper segment 7 is provided with a hole 38 in the vertical direction, and the hole 38 is formed of the coil spring. The emitting member 36 is fitted and the upper pressing pin 37 is inserted. In this case, the upper pressing pin 37 is composed of a shaft portion 39 and a large-diameter portion 40 that is connected to the base end of the shaft portion 39. Intervened between. A stopper (not shown) is provided at the lower opening of the hole 38 so that the upper pressing pin 37 does not come out of the hole 38.

Further, the inner surfaces of the upper and lower segments 7 and 8 are provided with protrusions 41 and 42 for forming tread grooves.
Further, in FIG. 1, 43 is an upper clip ring forming the tire inner diameter portion, and 44 is a lower clip ring forming the tire inner diameter portion.

Next, a method of manufacturing a solid tire using the molding vulcanizing mold constructed as described above will be described. First, as shown in (a) of FIG. 4, the upper die 3 is raised with respect to the lower die 6 to be in an open state. At this time, the upper segments 7 ... Are in a lowered state with respect to the upper mold 1 due to their own weight.
That is, it is sliding radially outward.

Next, as shown in FIG. 4B, a raw rubber 45 (green tire) that has been roughly molded in advance is inserted between the upper and lower molds 3 and 6 and the upper mold 1 is lowered. When the upper die 1 moves down, first, the upper pressing pin 37 contacts the upper surface of the lower tread ring 5. When the upper die 1 further descends with the upper pressing pin 37 in contact with the upper surface of the lower tread ring 5, the upper pressing pin 37 raises the upper segment 7 via the elastic member 36, and the upper segment 7 To the upper mold 1. That is, the upper segments 7 ... Are set before the raw rubber 45 is crushed.

After that, when the upper die 1 is lowered, the elastic member is
Against the resilience of 36, as shown in FIG. 4C, the mold is closed and the raw rubber 45 is crushed. In this state, vulcanization is performed at a predetermined pressure and a predetermined temperature. After vulcanization, the upper mold 1 is raised. At this time, due to the friction between the convex portion 41 for forming the tread groove of the upper segment 7 and the formed tire 46, the upper segment 7 has a force to lower the tire 46 with respect to the upper mold 1 (that is, not to rise). Force), only the upper mold 1 rises, and with this rise, the upper segment 7 slides radially outward and is disengaged from the tire 46, as shown in FIG.

Thereafter, as shown in FIG. 5B, the lower clip ring 44 is raised and the tire 46 is taken out of this mold, whereby the tire molding is completed. At this time, due to friction between the tread groove-forming projections 42 of the lower segment 8 and the formed tire 46, the lower segment 8 slides radially outward along with the rise, and the tire 46 is taken out. It will be easy. After the tire 46 is taken out, the lower segments 8 ... Are fitted into the lower mold 4 by their own weight.

As described above, according to the molding vulcanization mold of the present invention, when the raw rubber 45 is mounted on the mold and closed,
The upper segments 7 ... Are set in the upper mold 1, and when the upper segment 7 ... Is slid outward in the radial direction when taking out from this mold after vulcanization, the tire 46 can be taken out easily. There is.

Next, FIG. 6 shows another embodiment. In this case, a lower pressing pin 47 similar to the upper pressing pin 37 of the lower segment 8 ... Is provided corresponding to the upper pressing pin 37. There is.
That is, a hole 48 is provided in the lower segment 8, and an elastic member 49 composed of a coil spring is inserted into the hole 48, and the elastic member 49 presses the lower pressing pin 47 upward. In this case, the upper pressing pin 37 and the lower pressing pin 47 come into contact with each other.

Therefore, as shown in FIG. 4B, before the raw rubber 45 is crushed, the upper pressing pin 37 pressed by the elastic member 36 and the lower pressing pin 37 pressed by the elastic member 49. The upper segments 7 ... Are pressed upward by the pins 47, and the upper segments 7 ... Are set in the upper mold 1. In this case, since the vertical pressing pins 37 and 47 having a short stroke can be used, it is optimal when the segments 7 and 8 are small.

The inclination angle of the groove 11 of the upper die 1 and the groove 24 of the lower die 4 and the inclination angles of the slide keys 14 and 27 corresponding to the inclination angle depend on the shape and size of the tire 46 to be formed.
You can change it.

[0028]

Since the present invention is configured as described above, the following effects can be obtained.

The resistance due to the friction between the mold and the tire that occurs when the finished tire after vulcanization molding is taken out from the mold is reduced, and so-called rubber cracks and the like that tend to occur when a conventional mold is used. It is possible to prevent the defective appearance of the finished tire. It is possible to easily manufacture this vulcanization mold without the need for a complicated mechanism that a so-called split mold-compatible vulcanizer has, and it is possible to reduce costs and simplify the operating mechanism. Easy to use. When the upper and lower pressing pins are used, the stroke of each pressing pin can be set small, which is suitable for a small segment size. If one or a plurality of upper pressing pins 37 are provided on each of the upper segments 7, each upper segment 7 can be securely attached to the upper mold 1 before the raw rubber is crushed, and the raw rubber 45 can be attached when the mold is closed. Can be reliably crushed, and defective appearance of the finished tire can be reliably prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a vulcanization mold for solid tire molding according to the present invention.

FIG. 2 is an enlarged sectional view of a main part.

FIG. 3 is a simplified bottom view of the upper mold.

FIG. 4 is a simplified diagram showing a vulcanization method.

FIG. 5 is a simplified diagram showing a vulcanizing method.

FIG. 6 is a sectional view of a main part of another vulcanization mold for solid tire molding.

FIG. 7 is a sectional view of a main part of a conventional vulcanization mold for solid tire molding.

[Description of symbols] 1 upper mold 2 upper tread ring 3 upper mold 4 lower mold 5 lower tread ring 6 lower mold 7 upper segment 8 lower segment 36 elastic member 37 upper pressing pin 47 lower pressing pin 49 elastic member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29K 105: 24 B29L 30:00

Claims (4)

[Claims] 1. An upper mold 1 and an upper tread ring 2 attached to the upper mold 1 for forming a tire tread pattern portion.
An upper die 3 having a lower die 4 and a lower die 6 having a lower die 4 and a lower tread ring 5 attached to the lower die 4 to form a tire tread pattern portion. A solid tire molding vulcanization mold comprising upper and lower segments 7, ..., 8 ... Each of which has a plurality of tread rings 2, 5 arranged in the circumferential direction. The upper die 1 is provided with the upper segment 7 so as to slide radially outward while descending with respect to the upper die 1, and is pressed downward by the elastic member 36 so that the lower tread ring 5 side. The upper segment 7 by contacting the lower tread ring 5 before the raw rubber is crushed.
A vulcanization mold for molding a solid tire, characterized in that an upper pressing pin 37 to be mounted on the upper segment 7 is attached to the upper segment 7. 2. An upper mold 1 and an upper tread ring 2 attached to the upper mold 1 for forming a tire tread pattern portion.
An upper die 3 having a lower die 4 and a lower die 6 having a lower die 4 and a lower tread ring 5 attached to the lower die 4 to form a tire tread pattern portion. A solid tire molding vulcanization mold comprising upper and lower segments 7, ..., 8 ... Each of which has a plurality of tread rings 2, 5 arranged in the circumferential direction. The upper die 1 is provided with the upper segment 7 so as to slide radially outward while descending with respect to the upper die 1, and is pressed downward by the elastic member 36 so that the lower tread ring 5 side. An upper pressing pin 37 protruding to the upper segment 7 is attached to the upper segment 7, and a lower pressing pin 47 that is pressed upward by an elastic member 49 and projects toward the upper tread ring 2 side and abuts the upper pressing pin 37. Solid tie characterized by being attached to the lower segment 8 Vulcanizing mold for molding. 3. The vulcanization mold for molding a solid tire according to claim 1, wherein one or a plurality of upper pressing pins 37 are provided on each of the upper segments 7. 4. An upper mold 1 and an upper tread ring 2 attached to the upper mold 1 to form a tire tread pattern portion.
An upper die 3 having a lower die 4 and a lower die 6 having a lower die 4 and a lower tread ring 5 attached to the lower die 4 to form a tire tread pattern portion. A solid tire vulcanizing method using a vulcanizing mold for molding which comprises upper and lower segments 7, ..., 8 in which a plurality of tread rings 2, 5 are arranged in the circumferential direction. The upper pressing pin 37 ... is the lower tread ring 5 described above.
, The upper segments 7 are mounted on the upper mold 1, and then the raw rubber 45 is vulcanized in a mold closed state, and then the upper mold 3 and the lower mold 6 are separated from each other, A method for vulcanizing a solid tire, characterized in that the upper segment 7 is slid radially outward while sliding relative to the upper mold 1 to open the vulcanized tire.