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Method for manufacturing tire molding die and tire molding die

A manufacturing method and tire forming technology, which are applied in the manufacture of tire forming molds and the fields of tire forming molds

Active Publication Date: 2016-01-06
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this point, the tool stops in the middle of the vent, or in some cases, the tool gets damaged during insertion into the vent

Method used

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  • Method for manufacturing tire molding die and tire molding die
  • Method for manufacturing tire molding die and tire molding die
  • Method for manufacturing tire molding die and tire molding die

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0029] figure 1 is a sectional view showing the manufacturing process of the mold 1 of the first embodiment, in which figure 1 (A) shows the casting mold 10 when viewed from the side. figure 1 (B) is when from figure 1 The cross-sectional view of the casting mold 10 when viewed in the X1 direction of (A), figure 1 of (C) and figure 1 (D) are both the same as figure 1 (A) corresponds to the cross-sectional view of mold 1 (cast metal 2). exist figure 1 of (A), figure 1 of (B) and figure 1 In (C) of , the part (product part) which becomes the product of the mold 1 is shown by a two-dot chain line. figure 1 The arrow M shown in (A) of , indicates the moving direction of the surface of the molten metal 3 (schematically shown by the broken line) in the casting mold 10 .

[0030] As shown, the casting mold 10 includes: a main mold 11 for molding the cast metal 2 of the mold 1; a molding flask 12 for housing the main mold 11; and a stoke 13 for storing molten metal Metal 3. ...

no. 2 approach

[0055] The aforementioned relational expressions (Formulas A to C) include the term sin(90-θ). Therefore, if the contact angle θ of the wire rod 20 is 90°, the bending amount W of the wire rod 20 is zero regardless of the conditions of the length L and the diameter D of the wire rod 20 . Focusing on this characteristic, in the second embodiment, the contact angle θ of the wire rod 20 is set to 90°, and the wire rod 20 is arranged in the casting space 14 .

[0056] Image 6 It is a diagram showing how the wire rod 20 is arranged in the second embodiment and showing the cross section of the casting mold 10 . in addition, Image 6 (B) is when from Image 6 A cross-sectional view of the casting mold 10 when viewed in the X2 direction in (A). exist Image 6 In the figure, the part (product part) which becomes the product of the mold 1 is shown by a two-dot chain line. Image 6 The arrows M shown represent the direction of movement of the surface of the molten metal 3 (schemat...

no. 3 approach

[0061] In the third embodiment, in addition to the foregoing embodiments, the thickness of the mold release agent 22 required to pull the wire rod 20 from the cast metal 2 is predicted, and the conditions for setting the thickness of the mold release agent 22 are also predicted. As a result, the wire rod 20 is reliably pulled out from the cast metal 2 while the bending deformation of the wire rod 20 is suppressed.

[0062] Figure 7 It is a figure for demonstrating the pulling-out of the wire rod 20. FIG.

[0063] As illustrated, after the molten metal 3 shrinks by solidification in the casting mold 10, the cast metal 2 shrinks by cooling (see Figure 7 of (A) to Figure 7 (C)). With this contraction, the pressure R (see Figure 7 (C)) is applied to the wire 20, so that the frictional force between the wire 20 and the cast metal 2 becomes larger. When the wire 20 is to be drawn from the cast metal 2 (see Figure 7 (D)), the pull-out resistance J is applied to the wire 20...

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Abstract

The present invention limits bending deformation of wires disposed inside the mold during casting of the tire molding die and forms die vent holes with good precision. Using a relational formula representing the relationship between the length (L) of wires (20) inside a casting space (14), the diameter (D) of the wires (20), the contact angle (theta) of the wires (20) with respect to the molten metal (3), and the flexure (W) of the wires (20) due to the casting that have been determined previously by experimentation, the contact angle (theta) for the wires (20) such that the flexure (W) of the wires (20) will be within a permissible range is calculated from the actual length (L) and diameter (D) of the wires (20). On the basis of the calculated contact angle (theta) for the wires (20), the wires (20) are disposed inside the casting space (14). Molten metal (3) is injected into the casting space (14) in which the wires (20) are disposed to cast a casting (2) in which the wires (20) are cast-in inside the casting space (14). The wires (20) are withdrawn from the casting (2) to form the vent holes (4).

Description

technical field [0001] The present invention relates to a method for producing a tire-building mold having a vent hole, and a tire-building mold. Background technique [0002] In general, casting of a gypsum mold is used to manufacture a tire-building mold used for tire molding at the time of vulcanization. During this tire building, air trapped between the mold and the tire needs to be purged in order for the tire's rubber to spread to every corner of the mold. Thus, a vent hole (vent hole) is formed in the mold so that the air between the mold and the tire is exhausted through the vent hole. In addition, in order to reliably discharge the air, for example, exhaust holes each having a diameter of 0.6 mm to 1.6 mm are formed at several hundreds to thousands of positions in a pair of molds. [0003] Typically, vent holes are formed in the mold by drilling or electrical discharge machining. Thus, the formation of a large number of vent holes consumes a lot of labor and limi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/02
CPCB29D2030/0607B22D19/0072B22D19/06B29D30/0606B29D2030/0617C22C21/04C22C21/08B29C33/3842B29K2905/02
Inventor 石原泰之
Owner BRIDGESTONE CORP
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