JPH0354891Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention relates to an improved split mold for vulcanizing automobile tires.

<Prior art and its problems> The so-called split mold used for vulcanizing automobile tires mainly consists of a plurality of slide blocks 1 and an upper platen 2, as shown in FIGS. 2, 5, and 7. A set of guide members 5, an upper slide portion 6, bolts 7, and guide portions 1 for connecting and sliding the upper mold 3 and each slide block 1 to the upper mold 3 or the upper platen 2.
The actuator 8 is connected to each slide block 1 by means of an actuator 8 and a lower mold 9.

The bolts 7 are screwed into bolt holes 13 drilled at the center of the circumferential length of each slide block 1, and the guide member 5 holds the bolts 7 and attaches them to the upper part of the upper die 3 or the upper platen 2. Slide 6
slide.

The bolts 7 and the guide member 5 complement each other so that the slide block 1 and the upper die 3 or the upper platen 2 operate synchronously and in a well-balanced manner when the press is opened and closed, and furthermore, they are designed to prevent the guide part 10 from being worn out due to vibration. It is functioning.

In the case of the mold shown in Fig. 2, the upper mold 3 is pressed downward by a drive cylinder placed above the center of the split mold, and the upper platen 2 is raised by the opening operation of the press opening/closing mechanism (not shown). and the above platen 2
is raised together with the actuator 8, but each slide block 1 is moved up by the actuator 8 and the guide part 1.
Since they are engaged at 0, they do not rise but move in the directions of arrows 12 and are separated from the tread surface of the tire. At this time, the portion of the guide member 5 holding the bolt 7 screwed into each slide block also slides on the slide portion 6 of the upper die 3 and spreads in the radial direction.

3 is a longitudinal sectional view taken along the line AA in FIG. 2, and FIG. 4 is a longitudinal sectional view taken along the line BB in FIG. Needless to say, when the mold is closed, the operation is the opposite to the above.

Further, in FIG. 5, when the actuator 8 is raised by the opening operation of the press opening/closing mechanism (not shown) while the upper die 3 is pressed by the upper platen 2, each slide block is engaged with the actuator 8 by the guide part 10. As a result, they each move in the direction of arrow 12 and are separated from the tread surface of the tire.

At this time, the guide member 5 holding the bolt 7 screwed onto the slide block 1 also slides on the slide portion 6 of the upper mold 3 and expands in the radial direction.

FIG. 6 is a sectional view taken along the line B--B in FIG. 5.

However, in both FIG. 2 and FIG. 5, as described above and shown in FIG. Because of this, the movement of the slide block 1 in the radial direction is unstable. In particular, when the press is opened and the tread ring 11 is pulled away from the tire, it becomes extremely unstable.

This is because the slide block 1 swings between the right and left sides of the bolt 7 with one bolt 7 at the center of each slide block 1 as a fulcrum. That is,
The force F ₁ that presses the tread ring 11 against the green tire when the mold is closed or the force that pulls the tread ring 11 off the vulcanized tire when the mold is opened.
F ₂ is not uniform on the right and left sides of the bolt 7, and a difference occurs, and a biased force is applied to the fulcrum bolt 7, leading to breakage of the bolt 7.

If the bolts 7 break, the tire cannot be removed from the mold, causing trouble in that the tire cannot be removed, increasing loss time in the vulcanizer, and increasing the number of defective tires.

<Means for Solving the Problems> In view of the above, the purpose of this invention is to prevent the loss of time in the vulcanizer and the occurrence of defective tires due to bolt breakage during opening and closing of conventional split molds.

That is, this invention includes an actuator attached to an upper platen, a plurality of slide blocks slidably engaged with the actuator through a guide section, and a slide block attached to the upper surface of the slide block that slides over the upper slide section of the upper mold. A split mold for tire curing having a sliding guide member, characterized in that each slide block is slidably connected to an upper mold or an upper platen by two sets of guide members, an upper slide part, and a bolt. This is a split mold for tire curing.

<Example> The structure of the split mold of this invention is the same as that of the conventional split mold except that two sets of guide members, upper slides, and bolts are provided for each slide block 1, so a detailed explanation will be provided. is omitted.

In FIG. 1, the positions of the two bolt holes need to be equally distributed around the keyway F of the guide portion 10.

That is, ₀ = 1/6 to 1/3 is preferable with respect to the circumferential length of the slide block 1, and ₀ = 1/4.
is most preferred. ₀ = less than 1/6 and ₀ =
If it exceeds 1/3, it is not preferable because it is difficult in terms of processing technology.

In addition, you can set the above ₀ to be different by shifting it slightly for each slide block (for example, for the first slide block, ₀ = 1/4, for the second slide block, ₀ = 1/3). For example, when assembling the mold into a press, the work of fitting the upper mold and the slide block into each other becomes extremely easy, and fitting errors are eliminated, and so-called matching marks are no longer required.

<Effects of the invention> As described above, in this invention, each slide block has two sets of guide members, upper slides, and bolts. The positions of the two sets of bolts must be equally distributed with respect to the center of the guide. Distribution dimensions are ₀ = 1/6 to 1/3 relative to the circumferential length of the slide
To do so. As a result, (a) when the press is opened and closed, the slide block moves smoothly and the left and right balance is good, so there is no risk of bolt breakage. Therefore, loss time can be prevented.

(b) The tire peeling force can be twice as strong for the same slide block.

(c) Also, if ₀ is set differently for each slide block, it is easy to fit the upper mold and slide block when assembling the mold.
Also, mating errors are eliminated.

Effects such as

[Brief explanation of drawings]

Fig. 1 is a partial perspective view of the slide block of this invention, Fig. 2 is a sectional view of a conventional mold, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is Fig. 2 - B-- 5 is a sectional view showing another example of a conventional mold, FIG. 6 is a sectional view taken along line B-B of FIG. 5, and FIG. 7 is a partial perspective view of a conventional slide block. be. DESCRIPTION OF SYMBOLS 1... Slide block, 2... Upper platen, 3... Upper die, 5... Guide member, 6... Upper slide portion, 7... Bolt, 8... Actuator, 9... Lower die, 10... Guide part, 11...tread ring.

Claims (1)

[Scope of claims for utility model registration] (1) An actuator attached to the upper platen,
A split for tire vulcanization having a plurality of slide blocks slidably engaged with the actuator through a guide portion, and a guide member attached to the upper surface of the slide block and sliding on the upper slide portion of the upper die. 1. A split mold for curing a tire, wherein each slide block is slidably connected to an upper mold or an upper platen by two sets of guide members, an upper slide portion, and a bolt. (2) A tire vulcanizer according to claim 1 of the utility model registration claim, in which two sets of guide members, an upper slide part, and a bolt are arranged _{equidistantly} on both sides from the center of the guide part of the slide block. Split type. (3) The split mold for tire vulcanization according to claim 2, wherein the equal distance ₀ from the center of the guide portion of the slide block to both sides is different for each slide block.