JP5309420B2 - Fixing structure of siping blade to tire mold - Google Patents

Description

  The present invention relates to a structure for fixing a siping blade to a tire molding die. More specifically, when the tire molding die is discarded, the siping blade embedded in the die main body can be easily removed from the die main body. The present invention relates to a structure for fixing a siping blade to a tire molding die configured to be separable and removable.

  In general, a large number of narrow grooves (siping) may be formed on the tread surface of a tire for the purpose of increasing the braking force of the tire and reducing noise. It is formed by a siping blade made of many thin metal materials (for example, stainless steel etc.) embedded in the molding surface.

  For example, as shown in FIGS. 22 and 23, the siping blade is embedded in a base material 1 (a gypsum in the case of a gypsum casting method, a metal material such as iron in the case of a die casting method). The sipe molding part 2x of the ping blade 2 is embedded (gypsum is embedded in a gypsum mold, in the case of a metal mold, a groove is formed and embedded). A material (for example, aluminum) is poured and integrally cast.

  After this casting, in order to prevent the siping blade 2 from slipping out of the tire molding die 3 (showing one of the dies divided in the circumferential direction), An anchor hole 4 is formed on the side surface of the embedded portion 2y to allow the molten aluminum to flow as shown in FIG. 24 (a), or at the side edge of the embedded portion 2y as shown in FIG. 24 (b). By forming the undercut portion 5, the metal material of the tire molding die 3 is fixed integrally.

  In addition, as another method for fixing siping blades, a tire molding die is configured by stacking a plurality of plates, and by fixing the siping blades between the plates, even a complicated tread pattern can be obtained. A method for securely fixing a siping blade has been proposed (see, for example, Patent Document 1).

  However, in the former method in which the metal material of the tire molding die 3 and the siping blade 2 are fixed integrally, the siping blade 2 is attached to the tire molding die 3 when the tire molding die 3 is discarded. The tire molding die 3 is a composite of aluminum and the siping blade 2 made of stainless steel, and is disposed of as iron scrap. It was general. Accordingly, there is a problem that the mold for tire molding cannot be melted and made into a recyclable mold that can be used again as a mold, resulting in a large environmental load and a large waste of material resources.

Further, in the case of the latter method in which the siping blade is sandwiched and fixed between the plurality of plates, it takes a lot of labor and time to fix and position the siping blade, and it is difficult to improve productivity.
JP 2005-212430 A

  The present invention pays attention to such conventional problems, and is configured so that the siping blade embedded in the mold main body can be easily separated and removed from the mold main body. An object of the present invention is to provide a structure for fixing a siping blade to a tire molding die that can be reused.

In order to achieve the above object, the present invention inserts a siping blade into a through groove formed from the molding surface of the tire molding die toward the back side, and the siping blade is inserted into the back surface of the tire molding die. In the structure for fixing the siping blade to the tire molding die fixed detachably by the fixing means on the side, the fixing means of the siping blade protrudes from the back side of the tire molding die at the tip of the siping blade The gist is to fix the siping blade detachably by forming a claw to be formed, forming a through hole in the protruding claw portion, and inserting a pin into the through hole on the back side of the tire molding die. To do.

  With this configuration, the siping blade embedded in the mold body can be easily separated and removed from the mold body when the tire mold is discarded. The blade can be easily recycled.

According to the present invention, as described above, the fixing means for the sipe blade forms a claw protruding from the back side of the tire molding die at the tip of the sipe blade, and a through hole is formed in the protruding claw portion. By inserting a pin into the through hole on the back side of the tire molding die, the siping blade is detachably fixed, and the following excellent effects are obtained.
(A). At the time of disposal of the tire mold, easily separate the sipes blade is embedded in the mold body from the mold body, Ru can be removed.
(B). Tire molds and siping blades can be reused .
(C). Material resources can be used effectively .
(D). Since the tire molding die 3 is divided into pieces, it can be easily processed .

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the same components as those in the conventional example are denoted by the same reference numerals and description thereof is omitted.

One side view of FIG. 1 is split tire mold of the present invention (sector), FIG. 2 shows a front view of FIG. 1, the tire mold 3 (die body) of aluminum or the like A siping blade 2 made of stainless steel or the like is inserted into the through groove 6 formed integrally from the molding surface 3a of the tire molding die 3 toward the back side 3b. .

  The siping blade 2 is detachably fixed by a fixing means 7 on the back side 3b of the tire molding die 3, and in this first embodiment, a recess formed on the back side 3b of the tire molding die 3 A drop prevention band 7 a is attached to the tip of the siping blade 2 protruding from 8, and the siping blade 2 is fixed to the through groove 6 of the tire molding die 3.

  Therefore, when the tire molding die 3 is disassembled, the dropping blade 7a attached to the tip of the siping blade 2 is removed, so that the siping blade 2 can be easily removed from the through groove 6 of the tire molding die 3. I can do it.

3 (a), (b), (c) and FIGS. 4 (a) and 4 (b) show a fixing means 7 for fixing the siping blade 2. This fixing means 7 is shown in FIG. ), 9B, 9B having various shapes (square, circular, trapezoidal, etc.) protruding from the back side 3b of the tire molding die 3 at the tip of the siping blade 2 as shown in FIGS. 9C, and the claws 9A, 9B, 9C are bent and fixed as shown in FIG. 4A on the back side 3b of the tire molding die 3, and the bent portions are fixed with bolts 10. .

The 5 and 6 show another implementation form of the fixing means 7 for fixing the sipes blade 2, this embodiment, toward the rear side 3b of the molding surface 3a of the tire mold 3 forming A claw 9D protruding from the back side 3a of the tire molding die 3 is formed at the tip of the formed through groove 6, and a through hole 10 is formed in the claw portion 9D so that the claw 9D is formed on the back side of the tire molding die 3. The siping blade 2 is fixed by inserting a single pin 11 into the through hole 10.

The 9 to 12 show a fixing means 7 for fixing the sipes blade 2, the fixing means 7, located on the rear side 3b and internal mold 3A to form a molding surface 3a of the tire mold 3 A sipe blade that is divided into an external mold 3B and that has a claw protruding from the back side 3b in a through groove 12 formed in the internal mold 3A from the molding surface 3a side to the back side 3b. 2A is inserted, and the claw 2a bent by the siping blade 2A is sandwiched between the bottom surface of the internal mold 3A and the top surface of the external mold 3B and is detachably fixed.

Further, FIGS. 13 to 16 show the securing means 7 for fixing the sipes blade 2, the fixing means 7, each advance of sipes blade 2 sipes shaped portion 2x the base material 1 of the gypsum mold or a metal mold As shown in FIGS. 16 (a), 16 (b), and 16 (c), single or multiple layers (double pipes) are provided in each anchor hole 13 that is implanted and formed in the embedded portion 2y of the siping blade 2. An anchor rod 14 having a predetermined length and having heat resistance for preventing slipping is detachably inserted, and in such a state, molten metal is poured into a gypsum mold or a metal mold and embedded portion 2y of siping blade 2 Are integrally fixed. In the case where the anchor rod 14 for preventing slipping is a multilayer, the material may be the same or different.

  When the tire molding die 3 is disassembled, as shown in FIG. 15, the tire molding die 3 is pulled out by pulling one end 14 a of the anchor rod 14 from the recess 15 formed on one side surface of the tire molding die 3. The siping blade 2 can be separated from the metal mold 3 and removed.

  As a method for preventing the siping blade 2 from coming off, as shown in FIGS. 17 and 18, the siping blade 2 in a state where no anchor hole is formed in the tire molding die 3 is integrally cast. 19 and FIG. 20, through holes 16 are formed in the tire molding die 3 and the siping blade 2 from the side surface of the tire molding die 3, and a pin for preventing the slipping in the through hole 16. You may make it insert 17 and fix.

  Further, as means for forming the through hole 16 of the siping blade 2 in the tire molding die 3 after casting the tire molding die 3, as shown in FIG. (Cutter processing) 18a, or as shown in FIG. 21 (b), processed by wire cut 18b, as shown in FIG. 21 (c), processed by discharge electrode processing 18c, As shown in 21 (d), it is processed by laser processing 18 d.

As described above, in the implementation form of the invention, at the time of disposal of the tire mold 3, easily separate the sipes blade 2 which is embedded in the mold body from the mold body, it can be removed, the tire The molding die 3 and the siping blade 2 can be easily recycled. Moreover, since the tire molding die 3 is divided into pieces, it is easy to process.

Which is one of the side view of the tire mold which is divided showing the implementation form of the invention (sector). It is a front view of FIG. (A), (b), (c) is explanatory drawing of the nail | claw of various forms (square, circular, trapezoid etc.) formed in the front-end | tip of a siping blade. (A), (b) is explanatory drawing of the structure which bends and fixes the nail | claw formed in the front-end | tip of a siping blade. It is a side view of the metal mold | die for tire molding which shows the fixing means of this invention. FIG. 6 is a front view of FIG. 5. It is a front view of the siping blade used for the fixing means of FIG. It is explanatory drawing of the fixing method of the siping blade used for the fixing means of FIG. It is a side view of the metal mold | die for tire molding which shows the other example of a fixing means. FIG. 10 is a front view of FIG. 9. It is a side view of the metal mold | die for tire shaping | molding which shows the other example of the fixing means of this invention. It is a front view of FIG. It is a perspective view of the fixing method which has arrange | positioned the siping blade of this invention in the base material. FIG. 3 is a perspective view of a fixing method in which a siping blade is embedded in a tire molding die. It is an enlarged view of the X section of FIG. (A), (b), (c) is explanatory drawing which shows the structure of an anchor rod. As retaining method of preventing Size Lee ping blade is a plan view of a tire mold which is performed after casting the tire mold. It is a front view of FIG. As retaining method of preventing Size Lee ping blade is a plan view of a tire mold which is fixed by inserting a pin to open the hole in the sipes blade after casting of the tire mold. FIG. 20 is a front view of FIG. 19. (A), (b), (c), (d) is explanatory drawing of the means which forms the penetration groove for inserting a siping blade in the metal mold | die for tire molding after casting. It is explanatory drawing of the method of fixing a siping blade to the conventional metal mold | die for tire molding. It is explanatory drawing of the method of fixing a siping blade to the conventional mold for tire shaping | molding divided | segmented into plurality. (A), (b) is explanatory drawing of the fixing method of the conventional siping blade.

DESCRIPTION OF SYMBOLS 1 Base material 2 Siping blade 2x Sipe molding part 2y Embedded part 2A Siping blade 2a Claw 3 Tire molding metal mold 4 Anchor hole 5 Undercut part 3a Molding surface 3b Back side 3A Internal mold 3A , 3B External mold 6 Through groove 7 Fixing means 8 Recess 7a Fall prevention band 9A, 9B, 9C, 9D Claw 10 Bolt 10 Through hole 11 Pin 12 Through groove 13 Anchor hole 14 Anchor rod 14a One end 15 Recess 16 Through hole 17 Retaining prevention pin 18a Machining (cutting tool processing)
18b Wire cut 18c Discharge electrode processing 18d Laser processing

Claims (1)

A siping blade is inserted into a through groove formed from the molding surface to the back side of the tire molding die, and the sipe blade is detachably fixed by a fixing means on the back side of the tire molding die. In the structure for fixing the siping blade to the tire mold,
The fixing means for the siping blade forms a claw projecting toward the back side of the tire molding die at the tip of the siping blade, and a through hole is formed in the projecting claw portion to form the back surface of the tire molding die A structure for fixing a siping blade to a mold for molding a tire, wherein the siping blade is detachably fixed by inserting a pin into the through hole on the side.

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