JPH0316246B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a tire mold used for molding and vulcanizing tires. Specifically, in a tire mold consisting of a pair of upper and lower molds, the upper and lower mold shells are It has a pair of two-part structure, a sidewall mold is attached to each mold shell, and the tread ring, which is made up of a plurality of split molds in the circumferential direction, is divided into two parts near the tread center to form two tread ring halves. It is attached so as to be able to slide freely on the sliding surface of the lower mold shell, and furthermore, one or two jaws are provided on each of the split molds that make up this tread ring half, and the tread ring is surrounded by these jaws. A tread ring guide that is integral around the entire circumference is attached to the tread ring guide, and a drive device is connected to the tread ring guide via a piston rod, so that the drive device controls the operation of the tread ring halves when closing or opening the upper and lower molds. Therefore, it is an object of the present invention to provide a tire mold characterized in that the molding is performed synchronously.

Conventionally, in container-type tire molds used for molding and curing tires, there are 7 to 9 holes in the circumferential direction.
Although a tread ring composed of two split molds is used, this tread ring 1 has a structure that is integrated in the vertical direction in the width direction of the ring, as shown in FIG.

This tread ring 1 is set to the side wall mold of the lower mold B by sliding the slide surface 5 of the mold shell 4 of the upper mold A down to the tapered surface 3 of the actuator 2 integrated therein. Each segment of the split mold constituting the tread ring is pressed against the outer circumferential surface of the preshaved raw tire, and the upper mold and lower mold are brought into contact and the mold is closed.

However, since there is a small gap between the slide key surface of the upper mold shell and the key surface of the actuator, when the mold is closed, the tread ring contacts the tire outer surface in a slightly inclined state. Moreover, since the split molds do not operate synchronously, a slight step 6 is formed on the tire surface at the joint between the mold shell 4 and the tread ring 1, as shown in FIG.

As described above, the tread ring of conventional tire molds lacks synchronization in the circumferential direction, so when the upper and lower molds are closed, they close unevenly, which can cause the tire to deform. Otherwise, overspill causes a poor appearance, and since the tread ring consisting of a split mold is integral in the width direction, the segment block is large, making it inconvenient to replace the mold.

The present inventor has conducted studies to solve the above-mentioned drawbacks in tire molds, and as a result, has arrived at the present invention.

The present invention will be explained below based on FIGS. 3 to 6 showing one embodiment thereof.

This invention is a tire mold consisting of an upper mold and a lower mold, and the mold shell has a two-part structure with a pair of upper and lower molds, but since the structure of the lower mold is the same as that of the upper mold, the explanation thereof will be omitted. This will be omitted and only the structure of the upper mold will be explained.

Further, in the drawings, the reference numerals relating to each part of the lower mold are indicated by adding a to the reference numeral of the same part in the upper mold.

First, in FIG. 3, A is the upper mold and B is the lower mold.

Reference numeral 11 denotes a mold shell, to which a side wall mold 12 is attached with set screws 13.

Reference numeral 15 denotes a tread ring half body which is divided into two from the tread center of the tread ring 14 which is made up of a plurality of split molds in the circumferential direction, and this half body 15 is connected to the conical sliding surface 16 of the mold shell 11.
is attached to the mold shell 11 by a bolt 17 and a set screw 18 so as to be slidable.

When the tread ring half 15 slides on the sliding surface 16 of the mold shell 11, the bolt 17 slides on the guide groove 19 of the mold shell 11, and 20 is an adjustment collar for smooth sliding. be.

Therefore, the positioning of the tread ring half 15 is achieved by fitting the tread ring side guide 21 connected to the head of the half 15 into the mold notch hole 22 formed in the head of the mold shell 11, and This can be done accurately and easily by fitting another side guide 23 formed outward of the mold shell 11 into the mold knob groove 24 of the mold shell 11.

The plurality of split half bodies C constituting this tread ring 14 have a shape as shown in FIG.
1-2 treadling side guides 21 on the head
It has a jaw part 25 connected to the bottom part.

A tread ring guide 26, which is integrated all around the tread ring so as to surround the tread ring, is attached to the position of the jaw part 25 of the tread ring half body 15 made of such a half body C, and the jaw part 25 is attached to the recessed part of the tread ring guide 26.
The tread ring guide 26 is fitted with a bolt 27 and a set screw 28 in a long hole 29 provided in the tread ring guide 26.

Figure 5 shows the tread ring guide 26 and the half body C.
FIG. 3 is a perspective cross-sectional view showing a state of fitting with a mold shell 11. FIG.

The elongated hole 29 is provided with a stop bolt so that when the tread ring half 15 fixed to the mold shell 11 slides on the slide surface 16 of the mold shell 11, the tread ring guide 26 screwed to the jaw portion 25 can follow the movement. 27 is a hole for sliding.

30 is an adjustment collar fitted in order to make this sliding smooth.

Further, 31 is a cylinder or spring type driving device, which is connected to the tread ring guide 26 by a piston rod 32.
When the lower die is closed, uniform pressure is applied to the tread ring guide 26 to operate the entire tread ring 14 synchronously.

Therefore, it is preferable that two to four drive devices 31 be connected to the tread ring guide 26, which is integrally formed around the entire circumference.

Next, to explain the operation of the tire mold consisting of the upper mold A and the lower mold B having the above structure, first, when the upper mold A and the lower mold B are open,
When the tire T to be molded and vulcanized is brought close to the sidewall mold 12a of the mold shell 11a of the lower mold B, the drive device 31a of the lower mold B is activated to move the tread ring half 15a of the lower mold B to the sliding surface of the mold shell 11a. 16a to gradually lower it, and then the bladder (not shown)
At the same time as preshaping is completed, the head tread ring side guide 21a of the tread ring half 15a is fitted into the mold nok hole 22a of the mold shell 11a, and the tread ring side guide 23a is fitted into the mold nok groove 24a. tread ring 15a and mold shell 11
Connect a.

When the tread ring half 15a slides onto the slide surface 16a of the mold shell 11a, the set screw 18a slides along the guide groove 19a of the mold shell 11a, and
After connecting the tread ring half body 15a, tighten it.

After setting the tire T on the lower mold in this way, the upper mold A is then lowered.

First, gradually lower the mold shell 11,
The tread ring side guide 21 of the tread ring half 15 is fitted into the mold nok hole 22 of the mold shell 11, and the tread ring side guide 23 is fitted into the mold nok groove 24.

Then, the tread ring half 15 is brought into contact with the outer peripheral surface of the tire T, and the tread ring half 15a and the mold shell 11a of the lower mold B, which were previously set in contact with the tire T, are brought into contact with those of the upper mold A. Bring it into contact.

After that, the driving devices 31, 31 for the upper mold A and the lower mold B
At a, each tread ring guide 26, 26a
By pressing strongly, all the tread rings operate synchronously, and as shown in Figure 6, the tire is smoothly inserted into the mold along the circumference of the tire T without causing any steps or deformation on the tire surface. T can be set.

After vulcanizing the tire T in this state, first begin to bleed air from the bladder 33, and at the same time move the upper die A upward, then slide the tread ring half 15a of the lower die B together with the tire to form the sidewall. After separating from the mold 12a, the molded tire is removed by lifting only the tire T upward and removing it from the lower mold.

The structure and operation of the tire mold of the present invention have been explained above, and its features and effects include: 1. The tread ring, which is made up of 7 to 9 split molds in the circumferential direction, is divided into upper and lower halves near the tread center; As a result, each tread ring half is slidably attached to the upper and lower mold shells, so when setting the tire, the tread ring halves can be smoothly placed along the outer circumference of the tire, and there are no steps on the tire surface. Does not occur.

2 1 to 2 pieces for each split mold that makes up the tread ring
The jaw part of the ke was connected and formed.

3. A tread ring guide is installed around the entire circumference of the jaw so as to surround the tread ring, and a driving device is connected to the piston rod at several points on the guide for tightening, so the entire tread ring can be operated synchronously. , it can be placed evenly along the outer circumference of the tire.

4. The sliding surfaces of the mold shell and the tread ring are conical, and the tread ring side guide is fitted into the mold nok holes and grooves of the mold shell, so that the tread ring can be positioned accurately.

5 The upper and lower mold shells are in contact with each other when the mold is closed, so the press clamping force is received by the notch holes and grooves of the mold shell, and the aluminum tread ring receives the clamping force. There is no damage to the tread ring.

6. Since the joint between the tread ring and the sidewall mold is a tapered surface, unlike the conventional structure where the upper mold, lower mold and tread ring slide, it is possible to prevent mold galling (defects in engagement). .

7 When connecting the tread ring guide to the jaws of the tread ring half and the mold shell with a set screw, this is done within the long hole provided in the guide, so the set screw can slide within the long hole, allowing the tread ring to slide. The position of the tread ring guide does not change due to

8. Since the driving device can be installed inside the container, the device can also be installed in a press before split molds, for example, where the device cannot be installed outside.

9. Since the tread ring is divided into two parts, the upper mold and the lower mold, the sliding surface of the ring with respect to the mold shell becomes smaller, and the thickness of the mold shell can be increased accordingly, so that the rigidity of the mold can be increased.

10 Since the upper sidewall mold and tread ring do not have sliding surfaces, it is possible to prevent mold galling.

11 The tread ring side guide is fitted into the notch hole and the notch groove to hold the tread ring and mold shell, so even if the finishing accuracy of the clearance between the tread ring and mold shell is rough, the positioning of both can be performed accurately. Can be done.

12 Since the tread ring is split and consists of two halves, it is easy to handle.
Mold replacement work can also be easily performed.

The tire mold of this invention has great industrial value.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view showing a conventional tire mold, FIG. 2 is a partially enlarged sectional view, and FIG. 3 is a partially cutaway sectional view showing the tire mold of the present invention when opened. Fig. 4 is a partially cutaway sectional view of a half-split mold constituting the tire mold of the present invention, Fig. 5 is an explanatory diagram showing the state of contact between the mold shell, the tread ring, and the tread ring guide, and Fig. 6 is the present invention. FIG. 2 is a partially cutaway sectional view showing the tire mold when the tire is loaded and closed. 11, 11a...Mold Ciel, 12, 12
a...Side wall mold, 14...Tread ring, 15, 15a...Tread ring half, 16, 16a...Slide surface, 25, 25a
...Jaw portion, 26, 26a...Tread ring guide, 31, 31a...Drive device, A...Upper mold,
B...lower mold, C...half mold, T...tire.

Claims (1)

[Claims] 1. In a tire mold consisting of a pair of upper and lower molds, the mold shell is divided into a pair of upper and lower molds, a sidewall mold is attached to each mold shell, and a plurality of molds are installed in the circumferential direction. A tread ring consisting of a split mold is divided into upper and lower parts near the tread center, and the tread ring halves are slidably attached to the sliding surfaces of the upper and lower mold shells, and the individual split molds that make up the tread ring are attached. One to two jaws are formed in the jaw, a tread ring guide integrally attached to the entire circumference is attached to the jaw so as to surround the tread ring, and a plurality of drive devices are linked to the tread ring guide,
A tire mold characterized in that the upper mold and lower mold are closed and opened synchronously by the same device. 2. In the tread ring halves that slide on the sliding surfaces of the upper and lower mold shells, the heads of the respective split molds that make up the halves are tapered surfaces, and the heads are provided with one or two protrusions. A tread ring side guide is provided, and when the mold is closed by the upper mold and the lower mold, the guide fits into the mold nozzle hole drilled in the mold shell head of the upper mold and the lower mold, and the tapered surface of the head is inserted into the side wall mold. 2. The tire mold according to claim 1, wherein the tire mold comes into contact with a tapered surface.