JP3065939B2 - Tire mold and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a tire molding die made of an aluminum alloy and a method for producing the same.

[0002]

2. Description of the Related Art There are two types of tire molding dies, a vertical integrated type and a vertical split type.
As shown in FIG. 3, each block 2 has a molding space 3 corresponding to the shape of the tire when it is divided into 7 to 10 on the circumference thereof. The block 2 has a molding space 3 corresponding to the shape when the tire is cut in a circle at the center line of the peripheral surface.

[0003] Each of the molding dies usually has a structure shown in FIG.
As shown in (b), (c) and (d), the periphery of the gypsum mold 4 is surrounded by an annular casting frame 5, and a molten aluminum alloy 6 is poured between the gypsum casting mold 4 and the casting frame 5 to perform casting. It is manufactured by doing.

On the other hand, a tire is generally provided with a groove called a rib 9 running in a circumferential direction and a groove called a lug 10 running in a width direction, as shown in FIG. Further, a fine groove called a sipe 11 is provided. Therefore, a projection corresponding to each groove is formed in the tire molding die, but a projection (fine bone) corresponding to a fine groove such as a sipe becomes thin. Is insufficient, and the fine bone is damaged by a load at the time of molding the tire or at the time of releasing after the molding.

Conventionally, as a method of preventing such damage of the fine bone, a mold in which a fine bone having a predetermined shape is embedded by performing cutting, press bending, or the like on an iron-based plate material such as stainless steel is used. I was

[0006] In this case, the fine bone is embedded by the following method. First, as shown in FIG. 6A, the other portion of the fine bone 12 is cast into the plaster 14 while the portion 15 of the fine bone 12 to be embedded in the mold body is buried in the rubber mold 13. Then, the gypsum mold 4 shown in FIG. 6B is manufactured by releasing from the rubber mold 13. Next, as shown in FIG. 6 (c), a molten metal 6 of an aluminum alloy is poured into the gypsum mold 4 and cast.
A mold 1 (2) shown in FIG.

[0007] Furthermore, embedding of fine bones into a mold has also been performed by manufacturing a mold made of an aluminum alloy by casting and then performing post-processing.

Further, as another method for preventing damage to the fine bones, as shown in FIG. 7, a part of the iron-based plate 17 is cast into a mold body 18 at regular intervals to form a plate. After being arranged on the mold main body 18, the connection between the respective plate members 17 is also performed by casting.

[0009]

However, FIG.
When the fine bone 12 is embedded in the mold main body 18 by the method shown in (1), it is not possible to provide a fine bone that runs from one end to the other end of each block 2 constituting the mold 1;
There is a problem that a continuous sipe in which the fine bones provided in each block are integrally formed cannot be formed. This means that in order to provide fine bones that run from one end to the other end of each block, fine bones will be cast from one end of the plaster mold to the other end, but when performing casting, This is due to the fact that the temperature of the part of the fine bone that is cast with the aluminum alloy quickly rises, causing a temperature difference between the part and the part located inside the gypsum. That is, since the thermal expansion of the part cast by the aluminum alloy becomes large, deformation occurs such that the curvature R of the fine bone becomes small, and the deformation causes the fine bone to be distorted, causing the plaster to crack or the mold to die. This causes the position of the fine bone to be implanted to be shifted.

In the case of embedding fine bones by performing post-processing after manufacturing the mold, inconveniences such as cracking of the gypsum mold can be avoided, but the mold body made of aluminum alloy and the iron-based material are used. Due to insufficient fixing and adhesion to the fine bone, there is a problem that the fine bone falls off or becomes loose during tire molding. In addition, there is also a problem that a great number of man-hours and costs are required to embed the fine bone after casting.

[0011] Further, in a mold manufactured by connecting iron-based sheet materials cast into an aluminum alloy at regular intervals by casting, a continuous sipe extending over each block can be formed. However, there is a problem that the shape of the sipe is distorted because the joint between the plate material and the cast portion does not become a smooth flat surface or a curved surface but has steps or corners. There is also a problem that the cast portion having low strength is damaged during use of the mold.

The present invention has been made in view of such circumstances, and an object of the present invention is to form a continuous sipe extending over each block and to reduce the size of the sipe by pressure during casting. An object of the present invention is to provide a tire molding die capable of forming a smooth sipe having no steps, corners or the like without causing damage or falling off of a bone, and a method of manufacturing the same.

[0013]

That is, according to the present invention, there is provided a tire molding die provided with fine bones for forming a sipe, wherein a part of the fine bones made of an iron-based material is made of an aluminum alloy. The tire mold is provided in which a slit is formed at an appropriate interval in a part of the fine bone cast in the mold body.

The above-described tire molding die is a vertically integrated tire molding die in which the fine bones formed in each block are integrated to form a continuous sipe extending over each block. Good.

[0015] In the above-described tire molding die,
It is preferable that the width of the slit increases as approaching the molding surface of the mold body.

Further, according to the present invention, after the fine bone is fitted into the groove corresponding to the sipe provided in the gypsum mold in a state where the portion having the slit is exposed, the molten aluminum alloy is poured into the gypsum mold to cast. And a method for manufacturing the tire molding die described above.

In the above-described method for manufacturing a tire molding die, a cut-out margin is provided at both ends of the fine bone, and the cut-out margin has a rectangular cut-out portion at a corner on the side where the slit is provided. A state in which a clearance is provided between the two sides constituting the part, in contact with the side oriented parallel to the length direction of the fine bone, and the side oriented perpendicular to the length direction of the fine bone. Then, by driving the nail into the plaster mold,
The fine bone is fixed to the plaster mold at both ends and after casting,
It is preferable to remove the cutting margin.

Further, according to the present invention, there is provided a tire molding die made of an aluminum alloy having fine bones for forming a sipe, wherein a thin plate-shaped reinforcing material whose fine bones are made of an iron-based material is used. There is provided a mold for tire molding, wherein the reinforcing material is entirely cast in an aluminum alloy while the reinforcing material is provided inside and a part of the reinforcing material is inserted into the mold body.

In the above-described tire molding die, the reinforcing material preferably has a plurality of through holes.

The above-described tire molding die is a vertically integrated tire molding die in which the fine bones formed in each block are integrated to form a continuous sipe extending over each block. Alternatively, a vertical split mold for tire molding may be used.

Further, in the above-mentioned mold for molding a tire,
Two or more reinforcements are placed adjacent to the length of the fine bone,
A clearance may be provided between adjacent reinforcing members.

Further, according to the present invention, after the reinforcing material is installed in the gypsum mold in the groove corresponding to the sipe so as not to contact the inner wall of the groove, the molten aluminum alloy is poured into the gypsum mold. There is provided a method for manufacturing the above-described mold for molding a tire, in which the mold is cast.

In the above method for manufacturing a tire molding die, a pin made of an aluminum alloy having a slit on an end face is oriented so that the slit is parallel to a length direction of a sipe-compatible groove provided in a gypsum mold, and After driving into at least the bottom of both ends of the sipe corresponding groove so that the end face is located near the bottom of the sipe corresponding groove provided in the gypsum mold, the reinforcing material is inserted into the slit while inserting the end of the reinforcing agent into the slit. May be installed.

Further, in the above method for manufacturing a tire molding die, at least both ends of the sipe-corresponding groove are so formed that the pin made of the aluminum alloy is exposed from the bottom of the sipe-corresponding groove provided in the gypsum mold. After placing the reinforcing material in the sipe corresponding groove while placing the end of the reinforcing agent on the end of the pin, the reinforcing material is placed at an appropriate position between the pins. Auxiliary pins made of an aluminum alloy may be arranged on both sides.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as shown in FIG. 1, a tire mold is formed by casting a part of a fine bone 12 made of an iron-based material into a mold body 18 made of an aluminum alloy. And the fine bone 12 cast into the mold body 18
Are formed at appropriate intervals.

In addition, as shown in FIG. 8, this tire molding die secures the fine bone 12 in the sipe-corresponding groove 21 provided in the gypsum mold 4 with the portion where the slit 20 is formed exposed. Then, it is manufactured by pouring a molten aluminum alloy into a gypsum mold and performing casting.

By providing the slit, distortion of the fine bone caused by thermal expansion of the part cast by the aluminum alloy can be suppressed small, and the fine bone is cast from one end to the other end of the gypsum mold. Even in this case, the plaster mold is not broken at the time of casting, and the position of embedding the fine bone in the mold does not shift. In addition, since the fine bone is made of an iron-based material, the fine bone is not damaged by the pressure at the time of forming the tire. Further, since the fine bone is deeply embedded in the mold body, there is a possibility that the fine bone may fall off at the time of forming the tire. Absent. Therefore, it is possible to form a continuous sipe over each block in the tire, and the formed sipe is
It is smooth with no steps or corners. Therefore, for example, when the present invention is applied to an upper and lower integrated tire molding die, the fine bones formed in each block are integrated,
It is possible to form a sipe that goes around the circumference of the tire.

Although the shape of the slit is not particularly limited,
In order to reduce the risk of the fine bone falling out of the mold body, as shown in FIG.
It is preferable that the shape becomes larger as approaching the portion exposed from the mold body 18. For the same reason, the depth of the slit is preferably 3 mm or more.

The interval between the slits is preferably 5 to 50 mm. If the thickness is less than 5 mm, the fixation of the fine bone by casting becomes insufficient, and if it exceeds 50 mm, it is not possible to effectively prevent the occurrence of distortion due to thermal expansion. Further, the number of slits is appropriately determined according to the relationship between the length of the fine bone and the interval between the slits.

When manufacturing the tire molding die, as shown in FIG. 9A, rectangular notches are formed at corners on both sides of the fine bone 12 where the slits 20 are provided. 22
9 is provided at the time of casting.
As shown in FIG. 2B, 2
A state in which a clearance 26 is provided between a side 25 oriented in parallel with the length direction of the fine bone 12 and a side 25 oriented perpendicular to the length direction of the fine bone 12 among the two sides. It is preferable that the fine bone 12 is fixed to the gypsum mold 4 at both ends by driving the nail 27 into the gypsum mold 4.

As described above, by fixing the fine bone 12 to the gypsum mold 4, it is possible to prevent the fine bone 12 from shifting toward the mold main body during casting. The reason why the clearance 26 is provided is that when the fine bone 12 extends in the length direction of the fine bone 12 due to thermal expansion, the fine bone 12 is distorted and
This is to prevent the occurrence of breakage. The cutting allowance 23 is removed after casting.

As shown in FIG. 10, the fine bone 12 is formed by casting a part of a thin plate-like reinforcing member 28 made of an iron-based material into an aluminum alloy with the part inserted into the mold body 18. Thus, the object of the present invention can be achieved. That is, since the fine bone 12 has the reinforcing material 28 made of an iron-based material therein, the fine bone 12 is not damaged by pressure or the like at the time of forming a tire, and a part of the reinforcing material 28 is a mold. Since it is inserted into the main body 18 and is made of aluminum alloy, it does not easily fall off. Furthermore, a smooth sipe without steps, corners, etc. can be formed. Also, by casting the entire reinforcing member 28 with an aluminum alloy, there is also an effect that the aluminum alloy absorbs the thermal expansion of the reinforcing member 28 and can prevent the gypsum mold from being damaged during casting.

The thickness t of the reinforcing material is 1/1 / th of the thickness T of the fine bone.
It is preferably at least 3, and (Tt) / 2 is at least 0.3 mm. When the thickness t of the reinforcing material is less than 1/3 of the thickness T of the fine bone, sufficient strength cannot be given to the fine bone, and when (T-t) / 2 is less than 0.3 mm, This is because, when the mold is cleaned by sandblasting or the like, the aluminum alloy may peel off and the reinforcing material may be exposed. The embedding depth d of the reinforcing material into the mold body is preferably 2 to 15 mm. If the embedding depth d is less than 2 mm, the fine bones may fall off due to the pressure during tire molding, etc., and if it exceeds 15 mm, the difference in thermal expansion between the aluminum alloy and the iron-based material when using a mold. This may cause distortion in the mold body. The height h of the portion of the reinforcing material protruding from the mold body is preferably shorter than the height H of the fine bone by 1 to 5 mm. If it is shorter than 5 mm, there is a risk that the fine bone may be damaged due to pressure during tire molding, etc.
If the thickness is less than mm, the aluminum alloy may peel off when the mold is cleaned, and the reinforcing material may be exposed.

In the upper and lower integrated tire molding die, the number of the reinforcing members 28 cast into the fine bones may be one, but as shown in FIG. It is more preferable to provide a clearance 29 between the adjacent reinforcing members 28 corresponding to 1 to 6 degrees as the central angle of the tire to be molded. The reason for providing the clearance 29 is to prevent the reinforcing members from being distorted due to expansion of the reinforcing members due to heating at the time of casting and tire molding and causing distortion of the reinforcing members.

On the other hand, in the case where a fine bone corresponding to a sipe that goes around the peripheral surface of the tire by one turn is provided in a vertically integrated tire molding die, the reinforcing material is prevented from being distorted due to thermal expansion of the reinforcing material. In order to do so, it is necessary to divide the reinforcing material into at least two equal parts and to provide a clearance corresponding to 1 to 6 ° as the central angle of the molded tire between adjacent reinforcing materials. From the viewpoint of, for example, FIG.
As shown in the figure, 8 to 1 along the inner circumference of the tire molding die
It is more preferable to divide into six.

In the above-described tire molding die, after a reinforcing material is installed in a groove corresponding to the sipe provided in the gypsum mold so as not to contact the inner wall of the groove corresponding to the sipe, an aluminum alloy is poured into the gypsum mold. It is manufactured by casting.

In order to install the reinforcing member so as not to contact the inner wall of the sipe corresponding groove, a pin 31 made of an aluminum alloy having a slit 30 on an end face as shown in FIG. As shown in FIG. 12 (b), the slit 30 is oriented parallel to the length direction of the sipe corresponding groove 21 provided in the gypsum mold 4, and the end is located near the bottom of the sipe corresponding groove 21 provided in the gypsum mold 4. The reinforcing material 28 is set in the sipe corresponding groove 21 while being driven into the bottom of the sipe corresponding groove 21 so as to be positioned, and as shown in FIG. The pin 31 has a diameter smaller than the width of the sipe corresponding groove. The above-mentioned pins need to be arranged at least at both ends of the sipe corresponding groove, but an appropriate number may be arranged at an arbitrary position between the two pins arranged at both ends.

As shown in FIG. 15A, a pin 34 made of an aluminum alloy is connected to a gypsum mold 4
So that it is exposed from the bottom of the sipe corresponding groove 21 provided in
After driving at least the bottoms of both ends of the sipe corresponding groove 21, as shown in FIG. 15 (b), the reinforcing material 28 is placed on the end of the pin 34 while the reinforcing material 28 is placed on the end of the pin 34. Also, as shown in FIG. 15 (c), by arranging auxiliary pins 32 made of an aluminum alloy on both sides of the reinforcing member 28 at appropriate positions between the pins 34, the reinforcing member 28 can be installed so as not to contact the inner wall of the sipe corresponding groove 21.
The diameter of the auxiliary pin 32 is smaller than half the value obtained by subtracting the thickness t of the reinforcing material from the thickness T of the fine bone.

In the case where the shape of the sipe is a waveform, a sawtooth shape, a rectangle, or the like, as shown in FIG. 13A, a reinforcing material 28 having a shape corresponding to the shape of the sipe is used. For example, as shown in FIG.
8 may be used. Also, the shape of the sipe is wavy, sawtooth,
When a reinforcing material having a shape corresponding to the shape of the sipe is used in the case of a shape other than a linear shape such as a rectangle, from the viewpoint of reducing the change in the thickness of the aluminum alloy covering the reinforcing material, FIG. It is preferable to divide the reinforcing member 28 as shown in FIG.

At the time of casting, the molten aluminum alloy is filled into the sipe-corresponding groove provided in the gypsum mold, and the above-mentioned pins and auxiliary pins are cast into the aluminum alloy in a partially exposed state. A fine bone is formed in which a reinforcing material is cast in an aluminum alloy. In addition,
The part of the pin driven into the gypsum mold is cut after casting.

In the tire molding die described above, a plurality of through holes 33 may be provided in the reinforcing member 28 as shown in FIGS. This is because the aluminum alloy and the iron-based material are not fused only by casting of the aluminum alloy. Therefore, the aluminum alloy on both sides of the reinforcing member 28 is fused through the through-hole 33 so that the aluminum alloy is separated from the reinforcing member. This is to prevent If the area occupied by the through-holes on the reinforcing material is too large, the strength of the reinforcing material is reduced. Therefore, the diameter of each through-hole is preferably 1.0 to 3.0 mm. Area occupied by
Preferably it is 40%.

In the present invention, the aluminum alloy used for the mold body and the above-mentioned pins and auxiliary pins includes:
AC4C, AC4D, AC4F, AC7A and the like are suitably used, but it is more preferable to use the same material as the aluminum alloy constituting the mold body. In addition, as an iron-based material used for a fine bone or a reinforcing material for the fine bone, SUS30
4, SUS420T2, SUS631, S45C, S5
OC, SS41, SK4, SK5 and the like are preferably used, but those having higher Young's modulus are more preferably used.

[0043]

EXAMPLES Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. Example 1 A vertically integrated tire-molding mold having a fine bone partly made of an iron-based material cast into a mold body, and the cast-in part having a slit is manufactured and cast. At that time, the presence or absence of cracks in the gypsum mold, the dimensional accuracy of the height of the fine bone, and the magnitude of the bending strength of the fine bone were examined. Further, a tire was molded using the manufactured tire molding die, and the presence or absence of breakage of fine bone and the appearance of the formed sipe were examined.

As shown in FIG. 9A, the gypsum mold 4 is provided with fine bones 12 in which slits 20 are formed at regular intervals in a portion to be cast in the mold body. It was manufactured by pouring an aluminum alloy into the gypsum mold 4 and casting it after fixing the portion where the slit 20 was formed in the sipe corresponding groove 21 in an exposed state.
SUS304 was used for the material of the fine bone, and AC4F was used for the aluminum alloy.

At the time of casting of the tire mold, no crack was found in the gypsum mold. Also, the deviation of the height of the formed fine bone from the desired size is -0.5.
mm or less and within the range that can be prepared by modification after finishing. Further, the bending strength of the fine bone was 22 to 25 kgf / mm ² at the yield point at 0.2% proof stress.

Further, even after the tire was formed, no damage to the fine bone was observed, and a smooth sipe having no corners, steps or the like could be formed.

(Example 2) An upper and lower integrated tire molding die having a fine bone having a reinforcing material therein was manufactured, and the presence or absence of cracks in the gypsum mold during casting, and the height of the fine bone The dimensional accuracy and the strength of the fine bone were examined. Further, a tire was molded using the manufactured tire molding die, and the presence or absence of breakage of fine bone and the appearance of the formed sipe were examined.

As shown in FIG. 12 (c), the tire molding die is provided with a reinforcing member 28 in a sipe corresponding groove 21 provided in the gypsum mold 4 in a state where the reinforcing member 28 does not contact the inner wall of the sipe corresponding groove 21. After installation, it was manufactured by pouring an aluminum alloy into a gypsum mold and performing casting. In addition, the reinforcing material is provided with through holes having a diameter of 2.0 mm at intervals of 4 mm,
A reinforcing material having an opening ratio of 23% was used. Note that the same gypsum mold as in Example 1 was used.

The installation of the reinforcing member in the groove corresponding to the sipe was performed as follows. First, a pin having a slit on the end face is driven into the bottom of both ends of the sipe corresponding groove 21 so that the slit 30 is oriented parallel to the length direction of the sipe corresponding groove 21 as shown in FIG. It is. Next, the reinforcing member 28 was set in the sipe corresponding groove 21 while fitting the end of the reinforcing agent 28 into the slit 30. Further, FIG.
As shown in (2), auxiliary pins 32 were arranged on both sides of the reinforcing member 28 at appropriate positions between the pins 31. The portion of the pin 31 that was driven into the gypsum mold 4 was cut off after casting and after removing the gypsum mold. Note that SUS304 was used as the material of the reinforcing material, and AC4F was used as the aluminum alloy. The pins and the auxiliary pins were also made of AC4F.

[0050] At the time of casting the mold for molding a tire, no crack was found in the gypsum mold. In addition, no defects in appearance such as the exposure of the reinforcing material were observed in the formed fine bone, and the deviation of the height of the fine bone from the desired dimension was +0.
1 mm and -0.1 mm or less, which were within the range that can be prepared by modification after finishing. Further, the bending strength of the fine bone is such that the yield point at a 0.2% proof stress is 12 to 15 kgf / mm.
^{Was 2} .

Further, even after the tire was formed, no damage to the fine bone was observed, and a smooth sipe having no corners, steps, etc. could be formed.

(Comparative Example 1) An aluminum alloy was poured into a gypsum mold similar to that in Example 1 and casting was performed to produce an upper and lower integrated tire molding die entirely including an aluminum alloy including fine bones. Then, the dimensional accuracy of the height of the fine bone during casting and the magnitude of the bending strength of the fine bone were examined. Further, the tire was molded using the manufactured tire molding die, and the presence or absence of breakage of the fine bone was examined. AC4F was used as the aluminum alloy.

Although the dimensional accuracy of the height of the formed fine bone was good, the bending strength was 6% with a yield point at a proof stress of 0.2%.
~7kgf / mm ² and less, when forming the tire, bending at a rate of about once to about 3000 times, breakage of the falling or the like of the fine aggregate has occurred.

[0054]

According to the tire molding die of the present invention,
Since the fine bone is made of an iron-based material or has a thin plate-like reinforcing material made of an iron-based material therein, the fine bone is not damaged by pressure during casting or the like.

Further, a part of the fine bone provided with slits at regular intervals is cast into the mold body, or the whole reinforcing material is made of aluminum alloy while a part of the reinforcing material is inserted into the mold body. Since the fine bone is fixed to the mold body by casting, the fine bone does not easily fall off due to pressure during casting.

In casting a tire molding die,
In the case of forming the fine bone from one end to the other end of the molding die, the aluminum alloy that fills the slit or reinforcing material provided in a part of the fine bone absorbs the thermal expansion of the iron-based material. In addition, the fine bone is not deformed, and the plaster mold is not damaged by the deformation of the fine bone. Therefore, it is possible to provide a fine bone that runs from one end to the other end of each block, and a continuous sipe spanning each block, for example,
It is possible to form a sipe in the tire such that the sipe goes around the circumference of the tire.

Further, a smooth sipe having no steps, corners or the like can be provided to the tire.

[Brief description of the drawings]

FIG. 1 is a partial explanatory view showing an example of an installation mode of a fine bone in a tire molding die of the present invention.

FIG. 2 is a perspective view showing an example of a vertically integrated tire molding die.

FIG. 3 is a cross-sectional view showing an example of an upper and lower split type tire molding die.

4A and 4B are a plan view and a cross-sectional view taken along the line AA 'showing a method of casting a tire mold of a vertical split type. It is a (c) top view and (d) BB 'line sectional drawing which shows the casting method of the tire molding die of upper and lower integrated type.

FIG. 5 is a schematic view showing types of grooves provided in the tire.

6 (a) to 6 (d) are schematic views showing an example of a method for manufacturing a conventional tire molding die.

FIG. 7 is a partial explanatory view showing an example of an installation mode of a fine bone in a conventional tire molding die.

FIG. 8 is an explanatory view showing one example of a method for manufacturing a tire molding die of the present invention.

9A is a schematic view showing another example of a fine bone used in the method for manufacturing a tire molding die of the present invention, and FIG. 9B is a schematic diagram showing a method for manufacturing a tire molding die using the fine bone. FIG.

10 (a) is a partial explanatory view showing another example of the installation mode of the fine bone in the tire molding die of the present invention, and FIG.
It is AA 'line sectional drawing.

11 (a) and 11 (b) are partial explanatory views showing still another example of an installation mode of fine bones in the tire molding die of the present invention.

FIG. 12A is a perspective view showing an example of a pin having a slit on an end face used for installing a reinforcing member. (B) It is a perspective view which shows an example of the installation aspect of the pin which has a slit in an end surface in a sipe corresponding groove. (C) It is explanatory drawing which looked at the example of the installation aspect of the reinforcement in the sipe corresponding groove | channel when the pin which has a slit in an end surface was used, seen from the arrow A.

13 (a) to 13 (c) are cross-sectional views showing still another example of the installation mode of the fine bone in the tire molding die of the present invention.

14A is a perspective view showing still another example of an installation mode of a reinforcing material in a tire molding die of the present invention, and FIG. 14B is a cross-sectional view taken along the line AA ′.

FIG. 15 (a) is a perspective view showing an example of an installation mode of a pin in a sipe-compatible groove when a reinforcing material is placed on an end of the pin. (B) It is explanatory drawing which looked at the example of the installation aspect of the reinforcement in the groove corresponding to a sipe in the case of mounting a reinforcement on the edge part of a pin, seen from arrow A. (C) It is explanatory drawing which looked at the example of the installation aspect of the reinforcing material in the sipe corresponding groove | channel when the reinforcing material is mounted on the end part of a pin seen from the arrow B.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... tire molding die, 2 ... each block which comprises a tire molding die, 3 ... molding space, 4 ... gypsum mold, 5 ...
・ Cast frame, 6 ・ ・ ・ Metal melt of aluminum alloy, 7 ・ ・ ・ Mold fixing material, 8 ・ ・ ・ Tire, 9 ・ ・ ・ Rib, 10 ・ ・ ・ Lug, 11 ・ ・ ・ Sipe, 12 ・ ・ ・ Thin Bone, 13 ... rubber mold, 14 ... gypsum, 1
5: Fine bone portion embedded in the mold body, 16: Feeder, 17: Plate material, 18: Mold body, 19: Aluminum alloy, 20: Slit, 21 ... Sipe-compatible grooves, 2
2 Notch, 23 Cutout allowance, 24 Side oriented parallel to the length direction of the fine bone, 25 ... Side oriented perpendicular to the length direction of the fine bone, 26 ... clearance, 27 ...
Nail, 28: reinforcing material, 29: clearance, 30: slit, 31: pin, 32: auxiliary pin, 33: through hole, 34: pin.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FIB29L 30:00

Claims (13)

(57) [Claims] 1. A tire molding die having fine bones for forming a sipe, wherein a part of the fine bones made of an iron-based material is cast into a die body made of an aluminum alloy. A mold for tire molding, wherein slits are formed at appropriate intervals in a part of the fine bone cast into the mold body. 2. The tire molding die according to claim 1, wherein the fine bones formed in each block are integrally formed to form a continuous sipe extending over each block. Mold. 3. The tire molding die according to claim 1, wherein the width of each slit increases as approaching the molding surface of the die body. 4. After casting the fine bone into a groove corresponding to a sipe provided in a gypsum mold in a state where a portion having the slit is exposed, casting a molten aluminum alloy into the gypsum mold to perform casting. The method for producing a tire molding die according to claim 1, 2, or 3. 5. A cut-out margin is provided at both ends of the fine bone, and the cut-out margin has a rectangular notch at a corner on the side where the slit is provided. The nail is placed in a plaster mold in a state where the nail is in contact with a side oriented parallel to the length direction of the fine bone and a clearance is provided between the side oriented perpendicular to the length direction of the fine bone. 5. The method for manufacturing a tire molding die according to claim 4, wherein the fine bone is fixed to a gypsum mold at both ends thereof by casting, and the casting margin is removed after casting. 6. A tire molding die made of an aluminum alloy having fine bones for forming a sipe, wherein the fine bones have a thin plate-like reinforcing member made of an iron-based material therein. In a state where the reinforcing material is partially inserted into the mold body,
A tire molding die, characterized in that the reinforcing material is entirely cast in an aluminum alloy. 7. The tire molding die according to claim 6, wherein the reinforcing member has a plurality of through holes. 8. The tire according to claim 6, which is a vertically integrated tire molding die in which the fine bones formed in each block are integrated to form a continuous sipe spanning each block. Mold for molding. 9. The tire molding die according to claim 6, which is a vertically divided die for molding a tire. 10. The tire according to claim 6, wherein two or more reinforcing members are arranged adjacent to each other in the longitudinal direction of the fine bone, and a clearance is provided between the adjacent reinforcing members. Mold for molding. 11. After casting the reinforcing material in the groove corresponding to the sipe provided in the gypsum mold so as not to contact the inner wall of the groove corresponding to the sipe, casting an aluminum alloy melt into the gypsum mold. The method for producing a tire molding die according to any one of claims 6 to 10, characterized in that: 12. A pin made of an aluminum alloy having a slit on an end face thereof, wherein the slit is oriented parallel to the length direction of a sipe corresponding groove provided on the gypsum mold, and the end face is provided on a gypsum mold. Claims: At least two ends of the sipe corresponding groove are driven into the groove so as to be located near the bottom of the groove, and then the reinforcing material is placed in the sipe corresponding groove while fitting the end of the reinforcing agent into the slit. 12. The method for manufacturing a tire molding die according to item 11. 13. A pin made of an aluminum alloy is driven into at least the bottom of both ends of the sipe corresponding groove so that its end is exposed from the bottom of the sipe corresponding groove provided in the gypsum mold. The reinforcement is placed in the groove corresponding to the sipe while the end is placed on the end of the pin. Further, at an appropriate position between the pins, an auxiliary material made of aluminum alloy is provided on both sides of the reinforcement. The method for manufacturing a tire molding die according to claim 11, wherein the pins are arranged.