JP3165137B2 - Manufacturing method of tire molding die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a tire molding die.

[0002]

2. Description of the Related Art Basically, in manufacturing a tire molding die, first, as shown in FIG. 6A, an inversion die 13 is manufactured from a prototype (master model) 44, and then, FIG. (B)
As shown in FIG. 6, for example, plaster 14 is poured into the reversing mold 13 and solidified to produce the mold 4, and finally, FIG.
As shown in (c), the casting is performed by pouring a molten metal 6 such as an aluminum alloy into a casting flask 5 in which the mold 4 is arranged. As shown in FIG. 7, the tire 8 has thick grooves such as ribs 9 running in the circumferential direction and lugs 10 running in the width direction, so that the tire molding die has projections corresponding to these grooves. Will be.

However, depending on the type of tire such as a studless tire, as shown in FIG. 7, in addition to a thick groove such as a rib 9 and a lug 10, a fine groove called a sipe 11 may be further provided. Since the protrusions (fine bones) corresponding to such fine grooves are thin, aluminum alloys have insufficient strength. Usually, cutting, press bending, etc. is performed on iron-based plate materials such as stainless steel. A mold in which fine bones having a predetermined shape are embedded is used.

[0004] The manufacture of a tire molding die having such a fine bone is performed as follows. First, FIG.
As shown in the figure, a master model 44 in which a blade 45 is provided at a position where a sipe is to be formed is formed in order to form a margin for casting a fine bone into a mold.
Is prepared. Next, as shown in FIG. 8B, the portion of the fine bone 12 to be embedded in the mold body is inserted into the groove formed in the reverse mold 13 by the blade 45, and the fine bone 12 is set. Next, as shown in FIG. 8C, a portion of the fine bone 12 exposed from the inverted mold is cast into a plaster 14 or the like, and is released from the inverted mold 13 to form a mold shown in FIG. 4
Is prepared. Next, as shown in FIG. 8E, the molten metal 6 of the aluminum alloy is poured into the mold 4 and cast to obtain the mold 1 having the fine bone 12 shown in FIG. 8F.

On the other hand, since it is difficult to create a mold for the entire tire at one time, as shown in FIG. 6C, a plurality of mold building blocks 30 are created and the tires are combined in the circumferential direction. Generally, the mold 4 is used for casting a molding die. In this case, conventionally, each mold building block 30 has a shape obtained by cutting the mold 4 by a plane on its circumference. Therefore, the tire design was always cut in a straight line.

Further, it takes much effort to create a prototype and a reverse mold for the entire tire to be manufactured, and since the same pattern is frequently repeated in the surface design of the tire, a part of the surface design of the tire is required. In many cases, a mold for the entire tire is created by creating a prototype and an inversion mold only for this and combining partial molds created from the inversion mold.

For example, as shown in FIG. 9, when manufacturing a tire having a surface design in which three types of design patterns S, M and L are appropriately combined in the circumferential direction of the tire, the design pattern arrangement of MMSS and LLSS is If two types of partial molds (hereinafter, referred to as primary mold 51) are prepared, these are appropriately divided into blocks (hereinafter, referred to as primary molds 51).
It is called a secondary mold building block 50. ) Can be combined to form an overall tire mold (hereinafter, referred to as a secondary mold 52) having the design pattern configuration shown in FIG. For example, the upper block of C is MM
The secondary mold building block of SS can be used as it is, and the upper mold block can be created by cutting off the L and S patterns at both ends of the secondary mold building block of LLSS. Therefore, in this case, only two types having the design pattern arrangement of MMSS and LLSS need to be created for the prototype and the inverted type. The primary mold design pattern arrangement is selected according to the design pattern configuration of the entire tire. In this case, conventionally, when cutting out the secondary mold building block 50 from the primary mold 51, the primary mold 51 was divided into planes, so that the tire design on the primary mold was always cut in a straight line. .

In the above method, when creating a prototype for the primary mold, in order to reduce the labor for creating the prototype by creating the prototype of the primary mold from the beginning,
As shown in FIG. 10A, prototypes (hereinafter, referred to as primary prototypes 53) of each of the design patterns (S, M, and L in the above example) included in the surface design of the tire.
Of the primary template (hereinafter, referred to as a secondary prototype) by combining blocks (hereinafter, referred to as “secondary prototype building blocks 54”) created using inverted molds thereof in accordance with the design pattern sequence of the primary template. 55 (FIG. 10B). In this case, conventionally, the primary prototype 53 and the secondary prototype building block 54 have a shape in which the tire is cut along a plane on its circumference. Therefore, in the primary prototype 53 and the secondary prototype building block 54, the tire design was always cut straight.

[0009] There are two types of tire molding dies, a vertically integrated type and a vertically split type. In the vertically integrated type, as shown in FIG. In the upper and lower split molds, as shown in FIG. 12, each block 2 cuts the tire at a center line of its peripheral surface as shown in FIG. And a molding space 3 corresponding to the shape in the case of The manufacturing method described above with reference to FIGS. 6, 9 and 10 is applied to both upper and lower integrated molds and upper and lower split molds.

[0010]

However, a tire design block, a secondary mold building block, or a primary prototype and a secondary prototype building block are created by cutting a tire design along a straight line regardless of the contents of the design. Had the following problems.

First, when a mold is cast with the mold 4 formed by combining a plurality of mold building blocks 30 (FIG. 6).
(C)) In the case where a mold is cast by the secondary mold 52 formed by combining a plurality of secondary mold building blocks 50 (FIG. 9).
In the case where an inverted mold is created by a secondary mold 55 composed of a combination of a plurality of secondary mold building blocks 54 (FIG. 10),
Although burrs are generated in the mold and inversion mold portions corresponding to the joints of the respective blocks, when the tire design is cut in a straight line, the burrs correspond to the sipe 11 of the tire design as shown in FIG. In many cases, such corrections occur in places where correction is difficult, such as a part to be repaired, and there is a problem that work is reduced because the correction is troublesome, and the accuracy of design is reduced.

In addition, a blade is installed on the primary prototype and the secondary prototype to form a fine bone casting allowance, and when the tire design is cut in a straight line, the cutting line 31 becomes a blade 45 as shown in FIG. May occur. Therefore, the primary prototype and the secondary prototype building blocks are created without installing the blades, and when the secondary prototype is created by combining the secondary prototype building blocks, the blades are installed when the secondary prototype is created, or the secondary prototype configuration with the blades installed. After creating the block, remove the blade from the secondary prototype building block,
When the secondary prototype is created by combining the secondary prototype building blocks, the blades are installed, and there is also a problem that the working efficiency is impaired.

In the case shown in FIG. 9, fine bones are embedded in the primary mold 51. When the tire design is cut along a straight line, as shown in FIG. At the time of cutting, the cutting line 31 often hits the fine bone 12, so at the time of cutting, the fine bone 12 was removed from the primary mold 51, and the cut secondary mold building block 50 was combined to form the secondary mold 52. At this point, it is necessary to fit the fine bone 12 into the secondary mold 52, and there is a problem that the working efficiency is significantly impaired. In other words, if the secondary mold building block is cut out with the fine bones installed, the strength of the fine bones is much larger than that of gypsum, etc., so the gypsum part of the mold is destroyed at the moment when the processing tool contacts the fine bones. It is done.

Furthermore, in the case shown in FIG. 6, fine bones are embedded in the mold building block 30. When the tire design is cut along a straight line, as shown in FIG.
2 may be present over different mold building blocks 30, which may complicate the operation of forming the mold building block from the inverted mold, and also significantly reduce the work efficiency.

The present invention has been made in view of such circumstances, and an object of the present invention is to manufacture a mold having excellent design accuracy as compared with a conventional method of manufacturing a mold for tire molding. In addition, an object of the present invention is to provide a method of manufacturing a mold for tire molding that can be easily corrected when burrs are generated and that can be efficiently manufactured.

[0016]

That is, according to the present invention, there is provided a method for manufacturing a tire molding die, comprising a step of combining a plurality of mold building blocks to form a mold for tire molding die casting. Thus, a method of manufacturing a tire molding die in which a joining line when assembling the mold building blocks mainly passes through the inside of the thick groove constituting the tire design, and minimizes the number of times the joining line crosses the fine bone. Provided.

Further, according to the present invention, a secondary template building block having a design pattern array included in a primary template composed of a plurality of design patterns is cut out from the primary template, and these are appropriately combined to obtain a secondary template. A method for manufacturing a tire molding die having a step of forming a next mold, wherein the cutting line when cutting out the secondary mold building block from the primary mold mainly passes through the inside of the large groove constituting the tire design, and There is provided a method of manufacturing a tire mold that minimizes the number of times a cutting line traverses a fine bone. In the above manufacturing method, it is preferable that the cutting line only passes through the inside of the large groove.

In the above manufacturing method, when cutting the secondary mold building block from the primary mold, when cutting both ends of the primary mold, the primary mold is cut from only the one end and the primary mold. It is preferable to cut the other end of the primary mold in a state where the secondary mold building block and another secondary mold building block to be adjacent or another primary mold whose only one end is cut off are joined.

Further, according to the present invention, a secondary prototype is appropriately combined with a secondary prototype building block manufactured by using an inversion mold corresponding to a primary prototype for each type of design pattern constituting a tire design. A method for manufacturing a tire molding die having a step, wherein a joining line when combining secondary prototype building blocks mainly passes through the inside of a thick groove constituting a tire design, and the joining line is a fine bone cast-in. Provided is a method for manufacturing a tire molding die that minimizes the number of times of crossing a margin. In the above manufacturing method, it is preferable that the joining line only passes through the inside of the large groove.

In the present invention, when cutting and removing the machining allowances provided at both ends of the mold building block or the secondary prototype building block, only the machining allowance provided at one end is cut out of the mold building block or the secondary prototype construction. Block, another mold building block to be adjacent to the above-mentioned mold building block or secondary prototype building block or another secondary prototype building block, or another mold building block or other secondary building block obtained by cutting only the processing allowance provided at one end. It is preferable to cut a processing allowance provided at the other end of the mold building block or the secondary prototype building block in a state of being joined to the next prototype building block.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, in a method of manufacturing a tire molding die, when a plurality of mold building blocks are combined to constitute a tire molding die casting mold, as shown in FIG. The joining line 32 when assembling the mold building blocks 30 mainly passes through the inside of the large grooves 9 and 10 constituting the tire design, and the number of times the joining line 32 traverses the fine bone 12 is minimized. .

Further, in the method of manufacturing a tire molding die, a secondary mold building block having a design pattern array included in a primary mold composed of a plurality of design patterns is cut out from the primary mold, and these are appropriately cut out. When the secondary mold is combined with the secondary mold, as shown in FIG. 1, the cutting line 31 when the secondary mold building block 50 is cut out from the primary mold 51 passes through the inside of the large grooves 9, 10 constituting the tire design. The number of times that the cutting line 31 mainly crosses and crosses the fine bone 12 is minimized.

Further, even when a secondary prototype is appropriately combined with a secondary prototype building block manufactured using an inversion mold corresponding to a primary prototype for each type of design pattern constituting a tire design, FIG. As shown in FIG. 7, the joining line 32 when the secondary prototype building blocks 54 are combined is formed by the thick grooves 9 and 1 constituting the tire design.
0, and the number of times that the joining line 32 crosses the fine bone insert allowance 46 is minimized.

By making the cutting line 31 or the joining line 32 mainly pass through the inside of the large grooves 9 and 10 constituting the tire design, the cutting line 31 or the joining line 32
2, and the frequency of traversing the fine bone insert allowance 46 is reduced, thus minimizing the attachment / detachment of the fine bone or the fine bone insert allowance forming blade in the process of producing the secondary prototype or the secondary mold. And the production efficiency of the mold can be dramatically improved.

Further, by allowing the cutting line 31 or the joining line 32 to pass mainly through the inside of the large grooves 9 and 10 constituting the tire design, as shown in FIG. It mainly occurs at the portion 34 corresponding to one thick groove, that is, at the protruding portion. The burr 33 generated in such a portion is easy to correct, so that the degree of impairing the production efficiency is small, and when a tire is manufactured, it is a part corresponding to the inner wall of a large groove, so that the design accuracy of the tire is impaired. Not even.

In the present invention, as shown in FIG. 1A, it is preferable that the cutting line 31 or the joining line 32 pass only inside the thick grooves 9 and 10 constituting the tire design. However, depending on the tire design, it may not be possible to draw the cutting line 31 or the joining line 32 so as to pass only inside the large grooves 9 and 10. In such a case, FIG.
As shown in (b), the cutting line 31 or the joining line 32
"It passes mainly through the inside of the large groove", that is, as long as it can pass through the inside of the large groove 9, 10, the cutting line 31 or the joining line 32 is passed through the large groove 9, 10 and the cutting line 31 or the joining line 32 is “to minimize the number of times of crossing over the fine bone or fine bone casting allowance”, that is, the cutting line 31 or the joining line 32 passing through a part other than the inside of the large grooves 9 and 10 Is to bypass the fine bone 12 and the fine bone casting allowance 46 as much as possible, and even if the bypass is not possible,
The number of times of traversing the fine bone 12 and the fine bone casting allowance 46 is minimized. In the present invention, the term "thick groove" refers to a groove on a tire surface, such as a rib or a rub, which can be formed without using a fine bone.

In the present invention, when the cutting line or the joining line passes through a portion other than the inside of the thick groove, as shown in FIG. 3, the cutting line 31 or the joining line 32 and the thick groove 9, 10 and the sipe 11 If the area of the enclosed portion (the hatched portion in the drawing) is made small, the strength of the corresponding portion of the mold or the prototype becomes small, and the portion may be damaged. Therefore, the portion surrounded by the cutting line or joining line and the thick groove and sipe,
It is preferable to draw a cutting line or a joining line so as to have sufficient strength in relation to the materials of the mold and the prototype. In addition, from the viewpoint that the above-described problem does not occur, it is preferable that the cutting line or the joining line pass only inside the thick groove.

In the method of the present invention, the cutting line or the joining line often becomes a curve, in which case the cutting surface or the joining surface becomes a curved surface. End milling with a 5-axis NC machine, omnidirectional cutting with a spiral saw blade, diamond abrasive grain dispersion wire, and the like are performed. When using gypsum as the material of the mold or the prototype, the above processing is preferably performed after removing the crystallization water by drying, from the viewpoint of processing dimensional accuracy, but the strength of the gypsum was removed by drying the crystallization water. Since it is at a minimum at the time, there may be difficulties in fixing the mold or prototype. On the other hand, the strength of gypsum is maximized when only free water is removed by predrying, so from the viewpoint of gypsum strength, the above processing is performed after preliminary drying,
It is preferable to remove water of crystallization by main drying.

When the mold building block, the secondary mold building block, and the secondary prototype building block are assembled into a mold, a secondary mold, and a secondary prototype, respectively, the distance between each block is 0.1 to 0.2 mm. It is preferable to process so as to allow clearance. The reason for providing the clearance is to avoid the occurrence of mismatch during assembly due to a processing error.

As described above, the secondary mold building block of the present invention is cut out of the primary mold.
As shown in (a), it may be necessary to cut both ends (hatched portions in the figure) of the primary mold 51. At that time,
If the width of the primary mold cut only at one end is small, or if the primary mold cut at only one end has a shape with poor stability, it is difficult to fix the primary mold to the processing machine to cut the other end. Become. In such a case, FIG.
As shown in the figure, a primary mold 51a cut only at one end,
In a state where the secondary mold building block cut out from the primary mold and another secondary mold building block to be adjacent or another primary mold 51b cut at only one end are joined, FIG.
As shown in (c), the primary mold can be easily cut by cutting the other end.

Also, when creating the mold building block and the secondary prototype building block, it may be necessary to cut and remove the processing allowance provided on the joint surface with another block. Cutting method can be applied.

In order to make the joining surface between the mold building block and the secondary prototype building block a desired curved surface, in addition to the above-described cutting method, the mold building block is turned from an inverted mold by pouring gypsum or the like. Or, when creating a secondary prototype building block, as shown in FIG.
Partition plate 36 having a shape corresponding to the shape of the joining surface
(FIGS. 5A and 5B) or nesting 37 (FIG.
(C) and (d)) may be provided. When the mold building block and the secondary prototype building block are prepared by the method shown in FIG. 5, the dimensional accuracy is inferior to the case of cutting by a machine, but the setting of the workpiece to the processing machine and the processing itself are unnecessary. In addition, man-hours required for mold production can be reduced.

In the present invention, the materials of the mold building block, primary mold, secondary mold, primary prototype and secondary prototype include:
Gypsum, metal, resin and the like can be used. For joining the mold building block and the secondary prototype building block, a wavy nail, an instant adhesive or the like can be used.

[0034]

EXAMPLES Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

(Embodiment 1) As shown in FIG.
And a mold for manufacturing a tire having a surface design in which three types of design patterns L and L were combined in the circumferential direction of the tire. The mold is a vertical split type, and the surface design of the tire is 11 pitches for S, 10 pitches for M, and 9 for L.
It consists of a total of 30 pitches.

A prototype was prepared as follows. First, as shown in FIG. 10A, primary prototypes 53 corresponding to each of the three design patterns S, M, and L were made of model plaster. Blades were placed at locations corresponding to the sipe of the tire design. Next, an inverted mold was prepared from each primary prototype 53 using polysulfide rubber. Next, from the inverted type corresponding to S, M and L, S4
Pieces, M2 pieces, and L2 pieces of secondary prototype constituent blocks were made of model plaster. In addition, before pouring the gypsum into the reversing mold, by installing a blade on the reversing mold, the parts corresponding to the sipe of the tire design of each secondary prototype constituent block,
The blade was placed. In addition, a machining allowance was provided on both joint surfaces of the secondary prototype component block. Next, the machining allowance of the secondary prototype block was cut and removed by end milling using a 5-axis NC machine. The cutting is performed as shown in FIG.
Joining line 3 when combining secondary prototype building blocks 54
2 passed only inside the large grooves 9 and 10 constituting the tire design. Next, as shown in FIG. 10B, the created secondary prototype building blocks 54 are arranged in an arrangement of MMSS and LLSS, and are joined with a wave nail and an instant adhesive to form a pattern arrangement of MMSS and LLSS. Were obtained.

The mold was prepared as follows. First, reversal molds were prepared using polysulfide rubber for the two secondary prototypes thus prepared. After removing the burrs generated on the inverted mold, 11 pieces of the primary molds 5 for the lower mold and 11 pieces for the upper mold were formed from each of the two kinds of inverted molds with foamed gypsum.
1 was created. Before pouring the gypsum into the reversing mold, by setting the fine bones in the cast-in allowance formed inside the reversing mold by the blade of the secondary mold, the fine mold can be applied to the part corresponding to the sipe of the tire design of the primary mold. Bone was placed.

Next, secondary mold constituent blocks were cut out from the primary mold by end milling using a 5-axis NC processing machine in accordance with the design pattern blocks shown in FIG. As shown in FIG. 1, the cutting was performed so that the cutting line 31 passed only inside the large grooves 9 and 10 constituting the tire design. The cutting was performed after the primary mold was pre-dried to remove free water, and after the cutting, the main drying was performed to remove crystal water in the primary mold. Next, the prepared secondary mold building blocks were arranged according to FIG. 9 and joined with a wavy nail and an instant adhesive to obtain secondary molds for the upper mold and the lower mold.

As shown in FIG. 6C, the casting of the mold was performed by pouring a molten metal 6 of an aluminum alloy into a casting frame 5 in which the secondary mold 4 was arranged. At this time, the fine bones set in the secondary mold are cast in the mold. Finally, the generated burrs were removed to obtain a tire manufacturing mold.

(Comparative Example 1) The joining line of the secondary prototype building block and the cutting line for cutting out the secondary mold building block from the primary mold were made straight, without passing through the inside of the thick groove that constitutes the tire design. Example 1 except for
A mold similar to that of Example 1 was manufactured in the same manner as in Example 1.
Since the joining line of the secondary prototype building block was straightened, and the joining line was applied to the blade 45 as shown in FIG. 14, after creating the secondary prototype building block on which the blade was installed, The blade was removed from the secondary prototype building block, and the blade was installed when the secondary prototype was created by combining the secondary prototype building blocks. Further, since the cutting line for cutting out the secondary mold building block from the primary mold was set to be a straight line, the cutting line was applied to the fine bone 12 as shown in FIG. When the fine bone was removed and the cut-out secondary mold building blocks were combined to form a secondary mold, the fine bone was placed in the secondary mold.

In the example, it took only 20 minutes to create a secondary prototype by combining the secondary prototype building blocks, whereas in the comparative example, it was necessary to attach and detach the blade, so that it took 50 minutes. Cost.

Also, in the example, it took only 5 minutes to remove the burrs of the reverse mold for the prototype, whereas in the comparative example, the burrs occurred at a position where it was difficult to remove the burrs. Took 15 minutes. Furthermore, in the example, no design damage occurred in the secondary prototype, whereas in the comparative example, design damage occurred in the secondary prototype, and it took 20 minutes to repair them.

Also, in the examples, it took only 20 minutes to create the secondary mold by combining the secondary mold building blocks, whereas in the comparative example, it was necessary to attach and detach the fine bone. It took about 100 minutes. In addition, in the example, no design damage occurred in the secondary mold, whereas in the comparative example, design damage occurred in the secondary mold, and it took about 90 minutes to repair them.

Furthermore, in the example, it took only 20 minutes to remove the burrs generated in the mold, whereas in the comparative example, the burrs were generated at a position where it was difficult to remove the burrs. It took 220 to 250 minutes for removal and the like.

The molds manufactured in the examples had no design damage and good design accuracy. On the other hand, the mold manufactured in the comparative example was inferior in design accuracy due to repair of the design damage.

[0046]

According to the method for manufacturing a tire molding die of the present invention, it is possible to minimize the attachment and detachment of a fine bone or a fine bone cast-in substitute blade in the process of producing a secondary prototype or a secondary mold. Therefore, the production efficiency of the mold can be dramatically improved as compared with the conventional case. In addition, since burrs are mainly generated in a portion corresponding to a thick groove of a reversing die or a mold, that is, a protruding portion, correction is easy, and furthermore, the design accuracy of the tire is improved as compared with the conventional manufacturing method. Can be done.

[Brief description of the drawings]

FIG. 1 is a schematic view showing (a) an example and (b) another example of a cutting line or a joining line in a method for manufacturing a tire molding die of the present invention.

FIG. 2 is a schematic view showing an example of a burr generation mode in the method for manufacturing a tire molding die of the present invention.

FIG. 3 is a schematic diagram showing an example of a mode of damage of a tire design.

FIG. 4 is a process chart showing an example of a cutting method for cutting out a secondary mold building block from a primary mold.

5A and 5B are schematic views showing an example of a method for producing a mold building block and a secondary prototype building block, FIG. 5B is a cross-sectional view taken along the line AA ′ of FIG. 5A, and FIG. It is a schematic diagram which shows the figure and the sectional view on the AA 'line of (c).

FIG. 6 is a process chart showing an example of a conventional method for manufacturing a tire molding die.

FIG. 7 is a schematic view showing types of grooves provided in the tire.

FIG. 8 is a process chart showing an example of a conventional method for manufacturing a tire molding die having fine ribs.

9A is a schematic diagram illustrating an example of an array of design patterns and blocks of the design pattern constituting a surface design of a tire, FIG. 9B is a schematic diagram illustrating an example of a primary mold, and FIG. 9C is an example of a secondary mold. FIG.

FIG. 10 (a) is a schematic view showing an example of a primary prototype,
(B) It is a schematic diagram which shows an example of a secondary prototype building block and a secondary prototype.

FIG. 11 is a perspective view showing an example of a vertically integrated tire molding die.

FIG. 12 is a cross-sectional view showing an example of an upper and lower split type tire molding die.

FIG. 13 is a schematic view showing an example of a burr generation mode in a conventional method for manufacturing a tire molding die.

FIG. 14 is a schematic view showing an example of a cutting line of a tire design in a conventional method for manufacturing a tire molding die.

FIG. 15 is a schematic diagram showing an example in which the same fine bone is present over different mold building blocks.

[Explanation of Signs] 1 ... tire molding die, 2 ... each block constituting the tire molding die, 3 ... molding space, 4 ... mold, 5 ... casting frame, 6
... Aluminum molten metal, 7 ... Mold fixing material, 8 ... Tire, 9 ... Rib, 10 ... Lug, 11 ... Sipe, 12 ... Small bone, 13 ... Inverted mold, 14 ... Gypsum, 15 ... Embedded in the mold body Fine bone part, 16 ... hot water, 18 ... mold body, 3
0: mold building block, 31: cutting line, 32: joining line,
33 ... Burr, 34 ... Part corresponding to the thick groove, 35 ... Form,
36 ... partition board, 37 ... nesting, 44 ... prototype, 45 ...
Blades, 46: fine bone casting allowance, 50: secondary mold building block, 51: primary mold, 52: secondary mold, 53: primary prototype, 54: secondary prototype building block, 55: secondary prototype.

Claims (7)

(57) [Claims] 1. A method of manufacturing a tire molding die, comprising a step of combining a plurality of mold building blocks to form a mold for tire molding die casting, wherein a joining line for combining the mold building blocks is provided. However, a method for producing a tire molding die, characterized in that the number of times the joining line crosses the fine bone is minimized mainly through the inside of the large groove constituting the tire design. 2. A step of cutting out a secondary template building block having a design pattern sequence included in a primary template composed of a plurality of design patterns from the primary template and appropriately combining them to form a secondary template. A method for producing a tire molding die having a cutting line for cutting the secondary mold building block from the primary mold, mainly passing through the inside of a large groove constituting a tire design, and the cutting line is thin. A method for manufacturing a tire molding die, wherein the number of times of crossing a bone is minimized. 3. The method according to claim 2, wherein the cutting line passes only inside the large groove. 4. A tire molding process comprising a step of appropriately combining secondary prototype building blocks produced by using a reverse mold corresponding to a primary prototype for each type of design pattern constituting a tire design to form a secondary prototype. A method for manufacturing a mold, wherein a joining line when combining the secondary prototype building blocks mainly passes through the inside of a large groove constituting a tire design, and the number of times the joining line crosses a fine bone casting allowance. A method for manufacturing a tire molding die, wherein 5. The method according to claim 4, wherein the joining line passes only inside the large groove. 6. When cutting both ends of the primary mold when cutting out the secondary mold building block from the primary mold, the primary mold having only one end cut off is adjacent to the secondary mold building block cut out from the primary mold. The tire mold according to claim 2 or 3, wherein the other end of the primary mold is cut in a state where the other secondary mold constituent block to be formed or another primary mold whose only one end is cut off is joined. Method. 7. When cutting and removing machining allowances provided at both ends of a mold building block or a secondary prototype building block, a mold building block or a secondary prototype building block obtained by cutting only the machining allowance provided at one end; Other mold building blocks or other secondary building blocks to be adjacent to the mold building blocks or secondary prototype building blocks or other mold building blocks or other secondary prototype building blocks obtained by cutting only the processing allowance provided at one end. The method for manufacturing a tire molding die according to claim 1, wherein the processing allowance provided at the other end of the mold building block or the secondary prototype building block is cut in a state where they are joined.