JPH0620748B2 - Tire mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tire molding die.

[Problems to be Solved by Conventional Techniques and Inventions]

Conventionally, a mechanism that divides a sector into upper and lower parts, urges the respective divided pieces by elastic members such as springs, and causes the upper and lower divided pieces to contact each other according to the closing operation of the press to close the sector According to this method, since the elastic members have different inherent rigidity, the elastic forces of the elastic members are not always constant with each other. Therefore, when the mold is closed, the operating positions of the respective divided pieces become irregular, the positions of the mating surfaces of the upper and lower sectors fluctuate up and down, and they slide in the radial direction without being synchronized with each other (that is, with respect to each other). However, as a result, there is a drawback that the center (equator) of the tire deviates from the mold center where it should be, which impairs the uniformity of the tire.

Furthermore, set the low cover stretch, which is an advantage of the split mold, because the opening and closing of the sector is diagonal rather than horizontal (when using split molds, the outer diameter of the raw tire is close to that of the finished tire. The advantage that can be achieved is impossible.

In addition, the applicant of the present invention is
The tread sector is divided into upper and lower parts, and the actuator that moves the tread sector in the radial direction to open and close the mold also has a two-part structure, and when the mold is opened, the upper actuator is lifted and the lower actuator is predetermined. In order to raise the distance by a distance, the hook member is pivotally supported on the outer surface of the upper actuator, and the tip hook portion thereof can be engaged with and disengaged from the lower actuator.

In the mold of the above-mentioned invention, as described above, the hook member is provided on the outer surface of the mold, which is not sufficient in terms of downsizing of the mold.

Therefore, in the present invention, the mold can be further downsized, the opening and closing operation can be reliably performed without malfunction, the split position between the tread sector and the upper and lower molds can be freely set, and the tire uniformity is impaired. An object of the present invention is to provide a tire-molding die that does not have such a problem.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, one tire molding die according to the present invention comprises an upper actuator, an upper tread sector that slides in a radial direction along with the vertical movement of the upper actuator, a lower actuator, and the lower portion. A lower tread sector that slides in the radial direction as the actuator moves up and down, and a hook member that locks to the lower actuator and raises the lower actuator by a predetermined dimension as the upper actuator rises from the mold fully closed state. Is attached to the upper actuator, and the upper tread sector is provided with a pressing portion for releasing the locking of the hook member to separate the upper actuator and the lower actuator when the upper actuator has risen by a predetermined dimension. is there.

Further, another tire molding die according to the present invention includes an upper actuator, an upper tread sector that slides in the upper actuator in the radial direction while sliding on the upper actuator, and a lower actuator. A tire-molding mold comprising: a lower tread sector that slides in a radial direction while sliding on the lower actuator when the lower actuator moves up and down; a horizontal pivot shaft provided in the upper actuator. A hook member pivotally supported so as to be swingable and arranged at a lower end portion of the upper actuator closer to an inner diameter than an outer surface of the upper actuator, and a part of which protrudes from a lower surface of the upper actuator; an inner diameter from an outer surface of the lower actuator The upper actuator and the lower actuator are installed on the upper end of the lower actuator near In the close contact state, the front end hook portion of the hook member releasably locks; and the front end hook portion of the hook member is pressed in the inner diameter direction so that the upper actuator and the lower actuator are in close contact with each other. An elastic member for locking the tip hook portion to the locking portion; a hook provided in the upper tread sector, and in a mold open state in which the upper actuator is raised and the upper tread sector is slightly lowered. By abutting on a part of the member, the tip end hook of the hook member is pressed in the outer diameter direction against the elastic force of the elastic member, and the engagement of the hook member with the engaging portion is released. And a pressing portion.

[Action]

If the upper actuator is lifted from the mold fully closed state (the upper actuator and the lower actuator are in close contact with each other, and the tip hook portion of the hook member is locked to the locking portion), the lower actuator will be The upper tread sector descends as it is lifted by the hook member and rises together with the upper actuator, and the pressing portion (the tip of the dovetail groove) of the upper tread sector pushes the tip hook portion of the hook member in the outer diameter direction to make the tip end. The engagement of the hook portion with the engagement portion is released, and the upper actuator is separated from the lower actuator.

On the contrary, in order to fully close the mold from the state where the upper actuator and the lower actuator are separated (that is, the fully opened state), the upper actuator is lowered.
The upper tread sector abuts the lower tread sector, and the upper actuator pushes down the lower actuator, the upper and lower tread sectors move in the radial direction first, and the tip hook portion is locked to the locking portion.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

2 (I), (II) and (III) are simplified explanatory views of the closing operation of the tire molding die according to the present invention, which includes upper and lower dies 1 and 2, an upper tread sector 3a and a lower portion. A sector 3 including a tread sector 3b and an actuator 4 including an upper actuator 4a and a lower actuator 4b and disposed radially outside the sector 3 are provided, and an elastomer article such as a tire is vulcanized and molded. It is a thing.

The upper actuator 4a has a ring shape and is detachably fixed to the upper plate 19a.
The upper mold 1 is detachably fixed to the. The inner peripheral surface 5 is a tapered surface that gradually expands toward the outer diameter side as it goes downward, and the inner peripheral surface 5 is provided with a concave groove 6 as shown in FIGS. 1 and 6. A dovetail member 7 is fitted in the groove 6 by a fixing tool such as a bolt.

The upper tread sector 3a can be fitted into a concave circumferential groove 10 formed by the inner peripheral surface 5 of the upper actuator 4a, the lower surface 9 of the upper wall of the actuator 4a, and the outer peripheral surface 1a of the upper die 1. , Its outer surface 11 is the upper actuator 4
The taper surface is slidable on the inner peripheral surface 5 of a. And
As shown in FIGS. 1 and 6, the outer surface 11 is provided with a dovetail groove 12 into which the dovetail member 7 is slidably fitted.

Each upper tread sector 3a is constantly urged downward (that is, pushed down) by an elastic member 13 such as a coil spring attached to the upper actuator 4a. That is, as shown in FIG. 3, the upper tread sector 3a is provided with a blind hole portion 14, and the lower wall 9 of the upper wall of the upper actuator 4a is inserted into the hole portion 14 and elastic A supporting rod (15) on which the emitting member (13) is fitted is pressed. The respective axial centers of the hole portion 14 and the support rod 15 are
It is arranged with the same inclination angle as the inner peripheral surface 5 of the upper actuator 4a and the outer surface 11 of the upper tread sector 3a. Reference numeral 16 is a cylindrical body fitted in the hole portion 14, and 17 is a ring body disposed on the bottom surface of the hole portion 14.

Thus, the outer surface 18 of the lower tread sector 3b is the same inclined surface as the outer surface 11 of the upper tread sector 3a,
It is attached to the lower plate 19b so as to be slidable in the radial direction. The lower mold 2 is attached to the lower plate 19b. Further, in FIG. 1, 20 is a bolt member for slidably attaching the lower tread sector 3b to the lower plate 19b, and is fitted in a slide groove 21 provided in the lower plate 19b. The groove 21 is a so-called dovetail groove, and a flange portion is provided on the bolt member 20 so that the bolt member 20 does not come out of the slide groove 21.

The lower actuator 4b has a ring shape,
The inner peripheral surface 22 has the same inclined surface as the inner peripheral surface 5 of the upper actuator 4a. That is, the inner peripheral surface 22 and the outer surface 18 of the lower tread sector 3b are in sliding contact with each other. Then, as shown in FIG. 1, a concave groove 23 is formed on the inner peripheral surface 22 of the lower actuator 4b.
Is provided, and the dovetail member 24 is fitted into the concave groove 23 via the fastener 8. The outer surface 18 of the lower tread sector 3b is provided with a dovetail groove 25 into which the dovetail member 24 is slidably fitted. The dovetail groove 25 is formed in the block body 27 fitted in the groove 26 provided in the outer surface 18 of the lower tread sector 3b.

Thus, as shown in FIG. 4, the lower actuator 4b is constantly urged upward by an elastic member 28 such as a coil spring attached to the lower plate 19b (that is,
Has been pushed up). That is, the lower actuator 4b is provided with a plurality of vertical blind holes 29 ... Along the circumferential direction, and the lower plate 19b is fixed with the support rod 30 inserted into the holes 29. ing. The elastic member 28 is inserted into the hole 29 as an outer fitting shape on the support rod 30.

Then, in this mold, the mold is completely closed (that is, the first
A suspension mechanism 31 is provided for raising the upper actuator 4a when the upper actuator 4a is raised from the state shown in FIGS. 2 and 3 (III).

That is, the suspending mechanism 31 means that while the upper plate 19a is raised from the state shown in FIG. 2 (III) and the upper actuator 4a is raised by a predetermined dimension H as shown in FIG. 2 (II). As the upper actuator 4a rises, the lower actuator 4b locked by the hook member 34 rises, and thereafter, the upper actuator 4a further rises.
2 is lifted, the locking by the hook member 34 is released, only the actuator 4a is lifted as shown in FIG. 2 (I), and the lower actuator 4b is moved to the lower tread sector 3
It remains in sliding contact with the taper portion of b, and is pushed up by the elastic member 28. As shown in FIG. 1, the upper actuator 4a
Upper actuator 4 located inward inward from the outer surface 32 of the
a hook member 34 provided at the lower end 33, a locking portion 37 provided at the upper end 36 of the lower actuator 4b closer to the inner diameter than the outer surface 35 of the lower actuator 4b, and a tip hook portion 38 of the hook member 34 in the inner diameter direction. Elastic member 39 pushing inward
And the tip hook part provided in the upper tread sector
And a pressing portion 40 that presses 38 outward in the radial direction.

Here, the hook member 34 is a member pivotally supported by a horizontal pivot shaft 41 provided in the lower actuator 4 so as to be swingable, and a part (tip hook portion 38) of the upper actuator 4a. Of the lower surface 63 of the. The tip hook portion 38 is swingable in the radial direction. Also,
The pivot shaft 41 is supported by a supporting body 42 attached to the upper actuator 4a, and the supporting body 42 is a recess provided in a lower surface 63 of the upper actuator 4a as shown in FIGS. 5 and 8. It is fitted into the inside of 43 through a fastener 8. A through hole 44 is provided in the support body 42, and the hook member 34 is swingably inserted into the through hole 44. In addition, a notch 46 is provided in the center of the lower end of the inner wall of the support body 42, and further, projecting pieces 47, 47 are formed at the lower end of the inner wall in the inner diameter direction.
It is provided as shown in the figure. And the tip hook portion 38
Protrudes from the recess 43.

Further, the hook member 34 has a protruding portion 48 protruding in the inner diameter direction.
Is provided, the protrusion 48 is inserted into the notch 46 of the support 42, and if the hook member 34 is vertical as shown in FIG. 5 (I), the protrusion from the notch 46 is provided. 48 is protruding.

A recess 49 is provided on the inner surface of the outer wall of the support body 42, and a recess 50 is provided on the outer end surface of the hook member 34. The elastic member 39 is provided between the recesses 49, 50. It is installed. Therefore,
The hook portion 38 at the tip of the hook member 34 is pressed inward in the inner diameter direction to be locked to the locking portion 38.

Further, the locking portion 37 is provided in the fitting body 52 fitted in the recess 51 provided in the lower actuator 4b. That is,
The fitting body 52 is provided with a substantially rectangular through hole 53 (see FIG. 7), and the locking portion 37 is provided on the inner surface of the inner wall 54 thereof. The tip of the hook member 34 is inserted into the through hole 53.

Next, the pressing portion 40 is formed by the lower end portion of the block body 55 forming the dovetail groove 12 of the upper tread sector 3a. That is, as shown in FIG. 6, the block body 55 is fitted into the concave groove 56 provided on the outer surface 11 of the upper tread sector 3a through the fasteners 8 ...
A substantially L-shaped projecting piece forming 40 is projected. When the upper actuator 4a starts to move upward to open the mold and the upper tread sector 3a is pressed downward by the elastic member 13, the pressing portion 40 causes the hook member 34 to move as shown in FIG. 5 (II). The protruding portion 48 of the hook member 34 is pressed, and the tip hook portion 38 of the hook member 34 is pressed in the outer diameter direction, so that the locking portion 37 of the tip hook portion 38 is unlocked. Further, in the state shown in FIG. 5 (II), the lower end surface 57 of the block body 55 contacts the projecting pieces 47, 47 of the support body 42, and the upper tread sector 3a does not descend further. In FIG. 1, reference numeral 62 is a stopper, which is used to fix the fastener 8 on the upper surface 60 of the lower tread sector 3b.
It is fixed through.

Then, in order to vulcanize and mold a tire using this mold, as shown in FIG. 2 (I), a raw tire was placed on the lower mold 2 with the upper plate 19a raised. After that, the upper plate 19a is lowered, and in this case, as shown in FIG. 5 (II), the hook member 34 is partially pressed by the pressing portion 40, and the tip hook portion 38 is locked by the locking portion 37. However, as shown in FIG. 2 (II), after the upper tread sector 3a contacts the lower tread sector 3b, the upper tread sector 3a is pressed by the lower tread sector 3b and starts to rise. When the upper tread sector 3a rises, the block body 55 also rises at the same time and becomes in the locked state as shown in FIG. 5 (I). After that, when the upper plate 19a is further lowered to lower the upper actuator 4a, the lower actuator 4b is lowered against the elastic force of the elastic member 28,
Upper tread sector 3a and lower tread sector 3
At the same time, b slides in the inner diameter direction, and the mold is fully closed as shown in Fig. 2 (III). Then, vulcanization molding is performed in this fully closed state.

In this embodiment, the mating surface 61 of the lower surface 59 of the upper tread sector 3a and the upper surface 60 of the lower tread sector 3b coincides with the equator of the tire, and the upper tread sector 3a and the lower tread sector 3b slide. At this time, the mating surface 61 slides in the radial direction while maintaining the same level as the tire equator. Further, it is of course possible to dispose this mating surface 61 at a portion deviating from the equator of the tire, and at any position of this mating surface, this mating surface 61 fluctuates up and down during the mold closing operation. Without moving, both sectors 3a and 3b move inward in the radial direction while maintaining the same level.

Further, after the molding and vulcanization, if the upper plate 19a is raised, the tip hook portion 38 is locked to the locking portion 37,
As the upper actuator 4a rises, the lower actuator 4b also rises. That is, the upper tread sector 3a and the lower tread sector 3b slide in the outer diameter direction, and the sector 3 expands. Then, if the actuator 4a moves upward by a predetermined dimension H, the upper tread sector 3a is moved to the upper actuator 4a by a predetermined dimension H.
However, the pressing portion 40 comes into contact with the protruding portion 48 of the hook member 34 at this time. After that, if the upper actuator 4a is further raised, the pressing portion 40
By pressing 48, the lock is released as shown in FIG. 5 (II), and the lower actuator 4b is pushed up and supported by the elastic member 28. That is, the mold is fully opened except for the vulcanized tire.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

The mold opening / closing operation can be performed without malfunction, and the positions of the mating surfaces 41 of the upper and lower sectors 3a and 3b fluctuate up and down.
The sectors 3a and 3b do not slide in the radial direction in a state of being displaced from each other, and the uniformity of the tire is not impaired.

Further, since various members are not provided outside the mold, the mold as a whole can be made compact and good in appearance.

Further, the hook member 34, the fitting body 52 forming the locking portion 37,
The elastic member 39, the block body 55 forming the pressing portion 40, and the like can be held as a single component, and the attachment and detachment work is easy, which is advantageous in terms of maintenance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the present invention, FIG. 2 is a simplified cross-sectional view illustrating a mold opening / closing operation, and FIG.
4 is an enlarged sectional view of an essential part of a lower actuator and a lower plate, FIG. 5 is an enlarged sectional view of an essential part for explaining a mold opening / closing operation, and FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG. FIG. 7 is an enlarged sectional view taken along line VII-VII of FIG. 1, and FIG. 8 is VIII- of FIG.
VIII line enlarged sectional view, FIG. 9 is an IX-IX line enlarged sectional view of FIG. 3a ... upper tread sector, 3b ... lower tread sector, 4a ... upper actuator, 4b ... lower actuator, 32,35 ... outer surface, 33 ... lower end, 34 ...
… Hook member, 36 …… Upper end part, 37 …… Locking part, 38 …… Tip hook part, 39 …… Elastic member, 40 …… Pressing part, 41 …… Horizontal pivot shaft, 63 …… Lower surface .

Claims (2)

[Claims] 1. An upper actuator 4a, an upper tread sector 3a that slides in a radial direction as the upper actuator 4a moves up and down, and a lower actuator 4.
b, and a lower tread sector 3b that slides in the radial direction as the lower actuator 4b moves up and down. The lower tread sector 3b is locked to the lower actuator 4b and the upper actuator 4a rises from the mold fully closed state. Hook member for raising the lower actuator 4b by a predetermined dimension L
34 is attached to the upper actuator 4a, and when the upper actuator 4a rises by a predetermined dimension L, the hook portion 34 is unlocked to separate the upper actuator 4a and the lower actuator 4b from each other. A tire-molding die provided in the upper tread sector 3a. 2. An upper actuator 4a, an upper tread sector 3a which slides in the radial direction while sliding on the upper actuator 4a when the upper actuator 4a moves up and down, a lower actuator 4b, and a lower actuator 4b. Lower tread sector 3b that slides in the radial direction while sliding on the lower actuator 4b
And a horizontal pivot shaft provided in the upper actuator 4a.
The upper actuator 4 is swingably and pivotally supported by 41.
The hook member 34 disposed on the lower end 33 of the upper actuator 4a closer to the inner diameter than the outer surface 32 of a, and a part of which protrudes from the lower surface 63 of the upper actuator 4a, and the lower actuator closer to the inner diameter than the outer surface 35 of the lower actuator 4b. 4b is provided at the upper end portion 36, and the tip portion 38 of the hook member 34 detachably engages with the engaging portion 37 of the hook member 34 when the upper actuator 4a and the lower actuator 4b are in close contact with each other. By pressing the tip hook portion 38 in the inner diameter direction, the upper actuator 4a and the lower actuator 4b
In the close contact state with
The elastic member 39 to be locked to the 37 and the upper tread sector 3a are provided, and the upper actuator 4a moves upward to raise the upper tread sector 3a.
In the mold open state in which a is slightly lowered, it abuts against a portion of the hook member 34 and the tip hook 38 of the hook member 34 is abutted.
Is pressed in the outer diameter direction against the elastic force of the elastic member 39,
A tire molding die, comprising: a pressing portion 40 for releasing the engagement of the hook member 34 with the engagement portion 37.