JP2003136541A - Method for producing three-dimensional blade plate to be embedded in tire molding mold, and mold for producing the blade plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a three-dimensional blade plate to be embedded in a tire molding mold which can precisely mold the blade plate without forming a crack by an inexpensive mold and a mold for producing the blade plate. SOLUTION: The mold for producing the three-dimensional blade plate 2 is composed of a pair of a lower mold main body 6 and an upper mold main body which can be engaged with each other. In the lower mold main body 6, a semi-finished bent mold 8 and a finished article bent mold 9 are installed in at least one place. In the upper mold main body 7, a semi-finished bent mold 10, a finished bending preceding press movable bent mold 11, and a finished bent fixed mold 12 are installed at least one place corresponding to the lower mold main body 6. The semi-finished bent mold 8 formed in the lower mold main body 6, the finished article bent mold 9, the semi- finished bent mold 10 formed in the upper mold main body 7, the finished bending preceding press movable mold 11, and the finished bent fixed mold 12, have the same shape and are formed by an angular projection part and an angular recession which can be engaged with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a three-dimensional blade plate to be implanted on the inner surface of a tire molding die and a mold for manufacturing the three-dimensional blade plate, and more particularly to a three-dimensional shape. A method for manufacturing a three-dimensional blade plate embedded in a metal mold for a tire, which is capable of efficiently and accurately processing sheet metal at low cost, and a method for manufacturing the three-dimensional blade plate. It is about the type.

[0002]

2. Description of the Related Art On a tread surface of a vehicle tire, a large number of blocks and ribs are divided by grooves, and these blocks and ribs are provided with slits called sipe if necessary. There is. Such sipes are provided, for example, in order to ensure braking and steering stability on ice and snow road surfaces. When molding a sipe on the tread surface, a blade plate corresponding to the shape of the sipe is implanted on the inner surface of the tire molding die, and this blade plate is generally processed by pressing from a steel plate or the like.

By the way, in recent years, the number of sipes on the tread surface has been increased in order to improve the tire performance, but the rigidity of the tire tread is lowered, and the tire performance may actually be lowered.

[0004]

Further, by making the shape of the blade plate three-dimensional (bellows shape), it is possible to secure the rigidity of the tread and suppress uneven wear.
Since the bellows shape is inclined with respect to the tire tread surface, it is difficult to embed the blade plate in the mold by the conventional tire mold manufacturing method.

An object of the present invention is to provide a method for manufacturing a three-dimensional blade plate which is embedded in a tire molding mold capable of accurately manufacturing a three-dimensional blade plate which does not cause cracking with an inexpensive mold and the method thereof. It is to provide a mold for manufacturing a three-dimensional blade plate.

[0006]

In order to achieve the above-mentioned object, the present invention provides a method for manufacturing a three-dimensional blade plate according to the present invention, wherein a pre-punched developed plate is formed into a concavo-convex portion of a pair of upper and lower molds. The semi-finished product bending process is performed with the semi-finished product, and the semi-finished product is bent with the semi-finished product that has a plurality of concavo-convex parts engaged and positioned. This is the summary.

Here, a pair of upper and lower molds including the plurality of semi-finished bending die portions and a plurality of finished product bending die portions are used to continuously form a plurality of semi-finished bending work products and finished bending work products. Lateral holes are preliminarily formed in a portion of the expanded shape plate which has been formed into a blank and has been punched and which is subject to processing elongation. Further, when a semi-finished product is bent with a pair of upper and lower molds, a positioning guide plate is used.

By manufacturing a three-dimensional blade plate by such a method, a three-dimensional blade plate can be efficiently manufactured without cracking.

The mold for manufacturing a three-dimensional blade plate according to the present invention comprises a lower die body having a semi-finished bending die section and a finished product bending die section at at least one location, and a semi-finished body at at least one location. The gist of the present invention is that it is composed of an upper mold body including a completed bending die portion, a completed bending preceding pressing movable bending die, and a completed bending fixed die.

A semi-finished bending die portion formed on the lower die body,
The finished product bending mold part, the semi-finished bending mold part formed on the upper mold body, the completed bending preceding pressing movable bending mold and the completed bending fixed mold are formed in the same shape and with the mountain-shaped concavo-convex parts that can be engaged with each other. The lower die body is provided with a positioning plate used when bending a semi-finished bent product.

Further, in the completed bending fixed die, the movable bending die main body is arranged so as to be retractable through an elastic member in a recess formed in the upper die main body, and is positioned on the inner surface of the joint between the lower die main body and the upper die main body. Means are provided.

As described above, since the mold for manufacturing the three-dimensional blade plate is constructed with a relatively simple shape, it can be manufactured at a low cost, and the blade plate having a small size can secure the positioning accuracy while maintaining the narrowed portion. It is possible to prevent cracking and efficiently manufacture a blade plate.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a three-dimensional blade plate 2 embedded in a tire mold 1 and manufactured by the manufacturing method of the present invention. FIGS. 2A and 2B are punched three-dimensional. Front view of the expanded shape plate before bending of the blade plate 2 and A
3A is a front view showing a completed product of the three-dimensional blade plate 2, and FIG. 3B is a BB of FIG. 3A.
FIG. 3C is a side view taken along the arrow, and FIG. 3C is a plan view taken along the line CC of FIG.

The three-dimensional blade plate 2 is provided with a plurality of mountain-shaped convex portions 3 and concave portions 4 alternating in the width direction, and the convex portions 3 and the concave portions 4 are located at the tip side ( 3) has a three-dimensional shape shifted from each other on the upper side of FIG. 3 and the base side (the lower side of FIG. 3), and the X region on the tip side is a mold implant part,
The Y region on the base end side is the product shape portion.

As shown in FIGS. 4 to 7, the mold for manufacturing the three-dimensional blade plate 2 as described above is composed of a pair of upper and lower mold bodies 6 and 7 which can be engaged with each other. The lower die body 6 is provided with semi-finished bending die sections 8 and finished product bending die sections 9 at least at one or more locations (three in this embodiment, but the number is not limited), and the upper die The main body 7 is provided with a semi-finished bending die section 10, a completed bending preceding pressing movable bending die 11 and a completed bending fixed die 12 at at least one position at a position corresponding to the lower die body 6.

A semi-finished bending die portion 8 and a finished product bending die portion 9 formed on the lower die body 6, a semi-finished bending die portion 10 formed on the upper die body 7, and a completed bending preceding pressing movable bending die 11
And the completed bending-fixing die 12 has the same shape and is formed with a mountain-shaped convex portion and a mountain-shaped concave portion that can be engaged with each other. In this embodiment, the lower mold body 6 is formed with the mountain-shaped concave portion, Although the mountain-shaped convex portion is formed on the main body 7, it may be formed in reverse.

Further, the lower die body 6 is provided with a positioning plate 13 used for bending the semi-finished bent product. The completed bending fixed die 12 is the completed bending fixed die 12
An elastic member 15 such as a spring is provided in the recess 14 formed inside.
The completed bending preceding pressing movable bending die 11 is arranged so as to be retractable through the
1 is attached in a state in which it is always urged by an elastic member 15 in a direction in which it projects.

Incidentally, on the inner surface of the joint between the lower mold body 6 and the upper mold body 7, there is provided a positioning means comprising a positioning pin 16a at the time of engagement and a positioning recess 16b which engages with this.

Next, a method for manufacturing the three-dimensional blade plate 2 using the above-described manufacturing die will be described with reference to FIGS.
Description will be made with reference to (a), (b), (c) to FIGS. 10 (a), (b). In order to facilitate understanding of the following bending process, the tire tread cross-section (S in FIG.
The change will be described with respect to the shape change at −S, T−T).

First, as shown in FIGS. 2 (a) and 2 (b),
A plurality of lateral holes 5 are preliminarily machined and punched, and then a developed shape plate 2a of the three-dimensional blade plate 2 is provided with a positioning plate 13 on a semi-finished bending die portion 8 composed of a pair of upper and lower lower die bodies 6. The semi-finished bending die section 1 of the upper die body 7 which is placed using
The semi-finished product was bent by 0, as shown in FIG.
A semi-finished bent product Wa as shown in (b) and (c) is processed.

When the three-dimensional blade plate 2 is subjected to the double ridge bending process, the blade of the semi-finished bent product Wa is, as shown in FIG. The finished product bending die portion 9 is arranged on the P3 mountain portion, and then, FIG. 9 (b).
As shown in FIG. 3, the completed bending precedent pressing movable bending die 11 of the upper die body 7 and the finished product bending die portion 9 of the lower die body 6 are lowered.
With, the blade of the semi-finished bent product Wa is clamped and fixed in position, and then the finished bending fixing die 12 descends to complete the bending process of the finished bent product W of the three-dimensional blade plate 2.

Further, when the three-dimensional blade plate 2 is subjected to three-mount bending, as shown in FIGS. 10 (a) and 10 (b), the blade of the semi-finished bent product Wa among the bending peaks P1 to P4. Is placed on the P2 peak portion of the finished product bending die portion 9 of the lower die body 6 shown in FIG. 10 (a), and then the completed bending preceding press movable bending die 11 of the upper die body 7 that has descended is a semi-finished product. W
Although the flat part of the blade of a is pressed, since the blade of the semi-finished bent product Wa is engaged with the P2 crest, no positional deviation occurs, and in this state the completed fixed bending die 12 descends and the tertiary Bending of the three-finished bending work W of the original blade plate 2 is completed.

As described above, by making the shape of the tire mold implant portion of the three-dimensional (bellows-shaped) blade plate 2 perpendicular to the tire tread surface, the tire mold 1 can be easily manufactured by the conventional manufacturing method. The three-dimensional blade plate 2 has a discontinuous shape between the product portion and the implantation portion.

The tire mold 1 as described above cannot be manufactured by wire cutting or milling, which is a general method for manufacturing a conventional two-dimensional bending mold, and a three-dimensional numerical control program is used. Processing is required. Moreover,
Machining by a numerical control program requires a high numerical control program cost, requires an expensive machine tool, has a long delivery time, and results in an increase in cost.

The three-dimensional blade plate 2 according to the present invention is
As described above, the shape of the mold implant part in the X region and the product shape part in the Y region are changed, so that a drawing part can be formed, effectively preventing the work crack that has occurred in the conventional single-shot bending process. I can.

In this way, first, the semi-finished bent product Wa
If the blade is processed, the semi-finished bent product Wa and the completed bent product W can be continuously bent from the next operation, and the number of mountain-shaped uneven portions is increased. As a result, it is possible to continuously process a large number of three-dimensional blade plates 2.

As described above, since the die for manufacturing the three-dimensional blade plate is constructed with a relatively simple shape, it can be manufactured at low cost, and the blade plate having a small size can secure the positioning accuracy and the diaphragm portion. It is possible to efficiently produce a blade plate by preventing the cracking of the blade, and it is possible to efficiently produce a blade plate having a three-dimensional shape without causing a crack.

[0029]

As described above, according to the present invention, since the mold for manufacturing the three-dimensional blade plate has a relatively simple shape, it can be manufactured at a low cost, and the positioning accuracy is secured even with a blade plate having a small size. At the same time, there is an effect that a crack in the drawn portion can be prevented and a blade plate can be efficiently manufactured, and a blade plate having a three-dimensional shape can be efficiently manufactured without causing a crack during drawing.

[Brief description of drawings]

FIG. 1 is a perspective view of a three-dimensional blade plate embedded in a tire mold and manufactured by the manufacturing method of the present invention.

2 (a) and 2 (b) are front views of a punched three-dimensional blade plate before being bent and a developed shape plate, and FIG.
FIG.

3A is a front view showing a completed product of a three-dimensional blade plate, FIG. 3B is a side view taken along the line BB in FIG. 3A, and FIG. 3C is a line CC in FIG. 3A. FIG.

FIG. 4 is a front view of a pair of a lower mold body and an upper mold body that constitute a mold for manufacturing a three-dimensional blade plate.

FIG. 5 is a plan view of FIG.

FIG. 6 is a left side view of FIG.

FIG. 7 is a right side view of FIG.

8A is a front view of a semi-finished bent product of a three-dimensional blade plate, FIG. 8B is a plan view of FIG. 8A, and FIG. 8C is a plan view showing a processed state of the semi-finished bent product. is there.

9A and 9B are process explanatory diagrams of a lower mold body and an upper mold body when a semi-finished bent product is bent into two peaks.

10A and 10B are process explanatory diagrams of a lower mold body and an upper mold body when a semi-finished bent product is bent into three peaks.

[Explanation of symbols]

1 Tire mold 2 Three-dimensional blade plate 3 Mountain-shaped convex portion 4 Mountain-shaped concave portion 5 Horizontal holes 6 Lower body 7 Upper mold body 8 Semi-finished bending mold part 9 Finished product bending mold part 10 Semi-finished bending mold part 11 Completion bending preceding press movable bending die 12 Completed fixed bending type 13 Positioning plate 14 Recess 15 Elastic member 16a Positioning pin 16b Positioning recess 2a Expanded shape plate W finished bent product Wa Semi-finished bending products P1 to P4 Bending peaks

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuyoshi Yamada             160-40 Nakazato, Fuji City, Shizuoka Prefecture F-term (reference) 4F202 AH20 CA21 CU01 CU14

Claims (9)

[Claims] 1. A semi-finished product bending process is performed on a pre-punched expanded shape plate with a semi-finished bending mold part composed of a pair of upper and lower mold-shaped concavo-convex parts, and the semi-finished bending product is formed into a mountain shape. A method for manufacturing a three-dimensional blade plate, which is embedded in a tire molding die for bending a finished product in a state of being engaged with and positioned by a plurality of finished product bending die parts each having an uneven portion. 2. A pair of upper and lower molds provided with the plurality of semi-finished bending die sections and the plurality of finished product bending die sections, wherein a plurality of semi-finished bending work pieces and finished bending work pieces are continuously formed. A method for manufacturing a three-dimensional blade plate which is embedded in the tire molding die according to claim 1. 3. The method for producing a three-dimensional blade plate according to claim 1, wherein a lateral hole is formed in advance at a portion where the expansion of the punched expanded plate occurs. 4. The method for manufacturing a three-dimensional blade plate according to claim 1, wherein a positioning guide plate is used when bending the semi-finished product with a pair of upper and lower molds. 5. A lower mold body having at least one semi-finished bending mold part and a finished product bending mold part, and at least one.
A die for manufacturing a three-dimensional blade plate, which comprises an upper die body having a semi-finished bending die section, a completed bending preceding pressing movable bending die and a completed bending fixed die in more than one place. 6. A semi-finished bending die section, a finished product bending die section formed on the lower die body, a semi-finished bending die section, a completed bending preceding pressing movable bending die and a completed bending fixed die formed on the upper die body. The mold for manufacturing a three-dimensional blade plate according to claim 5, wherein and are formed in the same shape and have a mountain-shaped uneven portion that can be engaged with each other. 7. The mold for manufacturing a three-dimensional blade plate according to claim 5, wherein the lower mold body is provided with a positioning plate used for bending a semi-finished bent product. 8. The three-dimensional blade according to claim 5, 6 or 7, wherein the completed bending-fixing die is arranged such that the movable bending-die main body can be retracted through an elastic member in a recess formed in the upper die main body. Mold for manufacturing plates. 9. The mold for manufacturing a three-dimensional blade plate according to claim 5, 6, 7 or 8, wherein a positioning means is provided on an inner surface of the joint between the lower mold body and the upper mold body.