JP2017094675A - Rubber biting determination method, device and program of tire vulcanization machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for determining rubber biting of a tire vulcanization machine by a computer simulation.SOLUTION: The method for determining rubber biting of a tire vulcanization machine is configured to: simulate deformation of a green tire M2 from an initial state in which a pair of side molds 3, 3 are open, a state in which the green tire M2 is held with a bladder 4 and the pair of side molds 3, 3, until a side closed state before a tread mold 2 is closed; identify a position P2 of the green tire on a virtual straight line Li connecting contact surfaces 3a of the side molds 3; then determine that rubber biting occurs, when the green tire M2 is disposed on a tire width direction outside WD1 relative to a smallest diameter portion P1 of a side wall molding surface 3b, and determine that rubber biting does not occur, when the green tire M2 is not disposed on the tire width direction outside WD1 relative to the smallest diameter portion P1.SELECTED DRAWING: Figure 3A

Description

  The present disclosure relates to a rubber biting determination method, apparatus, and program for a tire vulcanizer.

  A vulcanizer that vulcanizes and forms a pneumatic tire includes a pair of side molds that are disposed on both sides in the tire axial direction to form sidewalls, a tread mold that includes a plurality of annularly disposed sectors, and a tread mold that forms a tread. And a bladder for applying an internal pressure to the tire. First, the bladder is inflated and the pair of side molds are closed, the green tire is held by the bladder and the pair of side molds, and then the tread mold is closed, and vulcanization of the tire is started. When the tread mold is closed with respect to the side mold, rubber may be sandwiched between the contact surfaces of the two, and molding defects may occur. Such a rubber biting problem is described in Patent Document 1.

  Although it is not a technique for predicting rubber biting, Patent Document 2 uses a vulcanizer model and a raw tire model to simulate the deformation of a tire during vulcanization, the tire deformation state, and the distortion of each member. And calculating stress.

JP 2007-210248 A JP 20032259592 A

  By the way, in the design of a tire vulcanizer, it is possible to manufacture an actual product and perform tire vulcanization to evaluate whether rubber biting occurs between a tread mold and a side mold. However, since this evaluation method requires cost and time, it is considered preferable to perform evaluation by simulation using a computer.

  However, it seems that the technology for predicting whether or not the rubber bite is generated using computer simulation is not disclosed in the literature as the prior art.

  This indication was made paying attention to such a subject, and the object is to provide a method, an apparatus, and a program which judge rubber biting of a tire vulcanizer by computer simulation.

  In order to achieve the above object, the present disclosure takes the following measures.

That is, the rubber biting determination method of the tire vulcanizer of the present disclosure is:
A step of setting a vulcanizer model and a raw tire model including a pair of side molds having a contact surface with a tread mold and a sidewall molding surface, and a bladder that applies internal pressure to the raw tire;
Vulcanization conditions from the initial state where the pair of side molds are open to the side closed state where the bladder is inflated and the pair of side molds are closed and the green tire is held by the bladder and the pair of side molds. Steps to set,
Based on the vulcanizer model and the vulcanization conditions, simulating the deformation of the raw tire from the initial state to the side closed state;
In the side closed state, identifying the position of the raw tire on a virtual straight line connecting the contact surfaces;
If there is a raw tire on the outer side in the tire width direction than the minimum diameter part on the tread mold side of the sidewall molding surface, it is determined that rubber biting occurs, and the outer side in the tire width direction than the minimum diameter part. When there is no raw tire in the step of determining that the rubber bite is not generated,
including.

The rubber biting determination device of the tire vulcanizer of the present disclosure is:
A model setting unit for setting a vulcanizer model and a raw tire model including a pair of side molds having a contact surface with a tread mold and a sidewall molding surface, and a bladder that applies internal pressure to the raw tire;
From the initial state in which the pair of side molds are open, the bladder is inflated, the pair of side molds are closed, the green tire is held by the bladder and the pair of side molds, and the side is closed before the tread mold is closed. A vulcanization condition setting unit for setting vulcanization conditions up to the state,
Based on the vulcanizer model and the vulcanization conditions, a simulation execution unit that simulates deformation of the raw tire from the initial state to the side closed state;
In the side closed state, a position specifying unit that specifies the position of the raw tire on a virtual straight line connecting the contact surfaces;
If there is a raw tire on the outer side in the tire width direction than the minimum diameter part on the tread mold side of the sidewall molding surface, it is determined that rubber biting occurs, and the outer side in the tire width direction than the minimum diameter part. When there is no raw tire, a determination unit that determines that rubber biting is not occurring,
Is provided.

  In this way, when the raw tire protrudes outside the minimum diameter portion of the side mold in the tire width direction, the presence or absence of rubber biting is determined based on the new knowledge and judgment criteria that rubber biting occurs. Since the determination is made, the determination can be made with high accuracy based on a new empirical rule. Nevertheless, since the simulation for closing the tread mold is not performed, complicated calculation and condition setting are unnecessary, and determination can be easily made.

The block diagram which shows the determination apparatus which concerns on this indication. A tire meridian cross-sectional view schematically showing a vulcanization operation of a tire vulcanizer. A tire meridian cross-sectional view schematically showing a vulcanization operation of a tire vulcanizer. A tire meridian cross-sectional view schematically showing a vulcanization operation of a tire vulcanizer. A tire meridian cross-sectional view schematically showing a vulcanization operation of a tire vulcanizer. The figure which shows the simulation result of the state which does not generate | occur | produce rubber biting. The figure which shows the simulation result of the state which rubber | gum biting generate | occur | produces. The flowchart which shows the rubber biting determination processing routine which the determination apparatus which concerns on this indication performs.

  Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[Judgment device]
The determination device 1 simulates the movement of the raw tire due to the operation of the tire vulcanizer, and determines whether rubber biting occurs.

  Specifically, as illustrated in FIG. 1, the apparatus 1 includes a model setting unit 10, a vulcanization condition setting unit 11, a simulation execution unit 12, a position specifying unit 13, and a determination unit 14. These units 10 to 14 are realized by cooperation of software and hardware by executing a processing routine (not shown) stored in advance by the CPU in an information processing apparatus such as a personal computer having a CPU, memory, various interfaces, and the like. Is done.

  The model setting unit 10 shown in FIG. 1 accepts an operation from a user via a known operation unit such as a keyboard and a mouse, and sets a vulcanizer model M1 and a raw tire finite element model M2 to be analyzed. Is stored in the memory.

  As shown in FIG. 2A, the raw tire model M2 and the vulcanizer model M1 are axial target models that are rotationally symmetric about the tire axis, and are defined in the tire meridian cross section. The raw tire model M2 is formed of tire constituent members such as a carcass ply, a bead core, a bead filler, a side wall rubber, and a tread rubber, and a finite element model is set for deformation analysis. The vulcanizer model M1 includes a pair of side molds 3 and 3 having a contact surface 3a with the tread mold 2 and a sidewall molding surface 3b indicated by an imaginary line, and a bladder 4 that applies internal pressure to the raw tire M2. In the figure, a clamp ring 5 is defined for holding the tire by the bladder 4. The bladder 4 is composed of a finite element model for deformation. The other parts, that is, the side mold 3 and the clamp ring 5 are rigid models having only a shape and no mesh. The tread mold 2 (also referred to as sector mold) may not be defined because it is not used in this analysis, but may be defined.

  The vulcanization condition setting unit 11 shown in FIG. 1 receives an operation from the user through the operation unit, executes setting of the vulcanization conditions used in the vulcanization simulation, and stores these set values in the memory. The vulcanization simulation simulates from the initial state to the side closed state. The initial state is a state in which the pair of side molds 3 and 3 are open as shown in FIG. 2A. When the vulcanization operation is started, as shown in FIGS. 2B to 2D, the bladder 4 expands and the pair of side molds 3 and 3 are closed, and the side is closed. As shown in FIG. 2D, the side closed state is a state in which the raw tire M2 is held by the bladder 4 and the pair of side molds 3 and 3, and is a state before the tread mold 2 is closed. As the vulcanization conditions to be set, as shown in FIG. 1, the initial positions of the parts constituting the vulcanizer M1 and the raw tire M2 and the positions of the parts (3, 5) of the vulcanizer M1 during operation are shown for each time point. And time-series data indicating the internal pressure of the bladder 4 for each time point.

  The simulation execution unit 12 shown in FIG. 1 is based on the vulcanizer model M1 and vulcanization conditions set by the model setting unit 10 and the vulcanization condition setting unit 11, and from the initial state (see FIG. 2A) to the side closed state (see FIG. 2D) to simulate the deformation of the raw tire M2. Since this analysis is publicly known, detailed description thereof is omitted, but as a gist, an equation of motion is calculated using the pressure applied to the raw tire M2 by the side mold 3 and the bladder 4 and the physical property values set in the raw tire M2. Is calculated to simulate the deformation of the raw tire M2.

  The position specifying unit 13 illustrated in FIG. 1 specifies the position P2 of the raw tire M2 on the virtual straight line Li that connects the contact surfaces 3a of the side molds 3 as illustrated in FIGS. 2D, 3A, and 3B. As the specifying method, specifying the position of the outer surface of the raw tire M2 in the virtual straight line Li can be mentioned.

  The determination unit 14 illustrated in FIG. 1 determines whether or not dust biting occurs based on the tire position specified by the position specifying unit 13. Specifically, as shown in FIGS. 3A and 3B, a minimum diameter portion P1 on the tread mold side of the sidewall molding surface 3b of the side mold 3 is specified. The minimum diameter portion P1 can be calculated from the shape data of the pair of side molds 3. As shown in FIG. 3B, the determination unit 14 determines that the rubber engagement is in a state where the raw tire M2 on the virtual straight line Li is on the outer side WD1 in the tire width direction from the minimum diameter portion P1. . On the other hand, as shown in FIG. 3A, when the raw tire M2 on the imaginary straight line Li is not on the outer side WD1 in the tire width direction from the minimum diameter portion P1, the determination unit 14 determines that no rubber biting occurs. To do.

  As shown in FIG. 2D, when the raw tire M2 is held by the side molds 3 and 3, the raw tire M2 may be offset in one of the tire width directions WD. It is preferable to perform both of the steps 3 and 3 in order to increase the determination accuracy. Of course, it is also possible to determine with only one side mold 3 as a reference.

[Judgment method]
The operation of the apparatus 1 will be described with reference to FIGS.

  First, in step ST1, the model setting unit 10 receives an operation from a user via a known operation unit such as a keyboard or a mouse, and a pair of side surfaces having a contact surface 3a with the tread mold 2 and a sidewall molding surface 3b. A vulcanizer model M1 and a raw tire model M2 including molds 3 and 3 and a bladder 4 that applies internal pressure to the raw tire M2 are set.

  In the next step ST2, the vulcanization condition setting unit 11 inflates the bladder 4 and closes the pair of side molds 3 and 3 from the initial state where the pair of side molds 3 and 3 are open (see FIG. 2A). Vulcanizing conditions up to a side closed state (see FIG. 2D) in which the green tire M2 is held by the bladder 4 and the pair of side molds 3 and 3 are set.

  In the next step ST3, the simulation execution unit 12 simulates the deformation of the raw tire M2 from the initial state to the side closed state based on the vulcanizer model M1 and the vulcanization conditions.

  In next step ST4, the position specifying unit 13 specifies the position P2 of the raw tire M2 on the virtual straight line Li connecting the contact surfaces 3a in the side closed state.

  In the next step ST5, the determination unit 14 determines whether there is a raw tire M2 on the outer side WD1 in the tire width direction from the minimum diameter portion P1 of the sidewall molding surface 3b. When the raw tire M2 is present on the outer side WD1 in the tire width direction (ST5: YES), the determination unit 14 determines that rubber biting is occurring. On the other hand, when the raw tire M2 is not present on the outer side WD1 in the tire width direction (ST5: NO), the determination unit 14 determines that no rubber biting occurs.

  If it is determined that rubber biting occurs, the contact surface 3a of the side mold 3 may be moved outward in the tire radial direction. A correction unit that performs such correction on the vulcanizer model M1 may be provided so that the above determination and correction are repeated until no rubber biting occurs.

As described above, the rubber biting determination method of the tire vulcanizer of the present embodiment is
A vulcanizer model M1 and a raw tire model M2 including a pair of side molds 3 and 3 having a contact surface 3a with the tread mold 2 and a sidewall molding surface 3b, and a bladder 4 that applies internal pressure to the raw tire M2. Step ST2 for setting,
From the initial state in which the pair of side molds 3 and 3 are open, the bladder 4 is inflated and the pair of side molds 3 and 3 are closed, and the side closure is performed where the bladder 4 and the pair of side molds 3 and 3 hold the raw tire M2. Step ST2 for setting vulcanization conditions up to the state;
Step ST3 for simulating the deformation of the green tire M2 from the initial state to the side closed state based on the vulcanizer model M1 and the vulcanization conditions;
In the side closed state, step ST4 for specifying the position of the raw tire M2 on the virtual straight line Li connecting the contact surfaces 3a;
When the raw tire M2 is present on the outer side WD1 in the tire width direction from the minimum diameter portion P1 on the tread mold side of the sidewall molding surface 3b, it is determined that rubber biting occurs, and the tire is smaller than the minimum diameter portion P1. When there is no raw tire M2 in the width direction outer side WD1, steps ST5 to 7 are determined to be in a state where no rubber biting occurs,
including.

The rubber biting determination device of the tire vulcanizer of this embodiment is
A vulcanizer model M1 and a raw tire model M2 including a pair of side molds 3 and 3 having a contact surface 3a with the tread mold 2 and a sidewall molding surface 3b, and a bladder 4 that applies internal pressure to the raw tire M2. A model setting unit 10 to be set;
From the initial state in which the pair of side molds 3 and 3 are open, the bladder 4 is inflated and the pair of side molds 3 and 3 are closed, and the raw tire M2 is held by the bladder 4 and the pair of side molds 3 and 3, and the tread A vulcanization condition setting unit 11 for setting vulcanization conditions until the side closed state before closing the mold 2;
Based on the vulcanizer model M1 and vulcanization conditions, a simulation execution unit 12 that simulates deformation of the raw tire M2 from the initial state to the side closed state;
In the side closed state, the position specifying unit 13 that specifies the position of the raw tire M2 on the virtual straight line Li that connects the contact surfaces 3a;
When the raw tire M2 is present on the outer side WD1 in the tire width direction from the minimum diameter portion P1 on the tread mold side of the sidewall molding surface 3b, it is determined that rubber biting occurs, and the tire is smaller than the minimum diameter portion P1. When there is no raw tire M2 in the width direction outer side WD1, the determination unit 14 that determines that the rubber biting is not generated,
Is provided.

  As described above, when the raw tire protrudes outside the minimum width portion P1 of the side mold 3 in the tire width direction WD1, the rubber engagement is based on the new knowledge and determination criterion that the rubber engagement occurs. Therefore, it is possible to determine with high accuracy based on a new empirical rule. Nevertheless, since the simulation for closing the tread mold 2 is not performed, complicated calculation and condition setting are unnecessary, and determination can be easily made.

In the method of the present embodiment, when at least one of the pair of side molds 3 and 3 has the raw tire M2 on the outer side WD1 in the tire width direction from the minimum diameter portion P1, it is in a state in which rubber biting occurs. Steps ST5 to ST7 for determining that both the pair of side molds 3 and 3 are in a state in which no rubber biting occurs when there is no raw tire M2 on the outer side WD1 in the tire width direction from the minimum diameter portion P1. including.
In the apparatus according to the present embodiment, the determination unit 14 causes rubber biting when at least one of the pair of side molds 3 and 3 has the raw tire M2 on the outer side WD1 in the tire width direction from the minimum diameter portion P1. When both the pair of side molds 3 and 3 have no raw tire M2 on the outer side WD1 in the tire width direction from the minimum diameter portion P1, it is determined that no rubber biting occurs. To do.

  According to this configuration, when the raw tire M2 is held by the side molds 3 and 3, even when the raw tire M2 is offset in any one of the tire width directions WD, it is possible to accurately determine the rubber engagement.

The program according to the present embodiment causes a computer to execute each step constituting the method.
By executing these programs, it is possible to obtain the operational effects of the above method. In other words, it can be said that the above method is used.

  As mentioned above, although embodiment of this indication was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present disclosure is indicated not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, each of the units 10 to 14 illustrated in FIG. 1 is realized by executing a predetermined program by a CPU of a computer, but each unit may be configured by a dedicated memory or a dedicated circuit.

  In this embodiment, the mold uses a sector, but a two-piece mold may be used.

  The structure employed in each of the above embodiments can be employed in any other embodiment. The specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present disclosure.

DESCRIPTION OF SYMBOLS 1 ... Apparatus 10 ... Model setting part 11 ... Vulcanization condition setting part 12 ... Simulation execution part 13 ... Position specification part 14 ... Determination part 2 ... Tread mold 3 ... Side mold 3a ... Contact surface 3b ... Side wall molding surface 4 ... Bladder M1 ... Vulcanizer model M2 ... Raw tire model Li ... Virtual straight line P1 ... Minimum diameter part of side mold P2 ... Raw tire position

Claims (5)

A step of setting a vulcanizer model and a raw tire model including a pair of side molds having a contact surface with a tread mold and a sidewall molding surface, and a bladder that applies internal pressure to the raw tire;
Vulcanization conditions from the initial state where the pair of side molds are open to the side closed state where the bladder is inflated and the pair of side molds are closed and the green tire is held by the bladder and the pair of side molds. Steps to set,
Based on the vulcanizer model and the vulcanization conditions, simulating the deformation of the raw tire from the initial state to the side closed state;
In the side closed state, identifying the position of the raw tire on a virtual straight line connecting the contact surfaces;
If there is a raw tire on the outer side in the tire width direction than the minimum diameter part on the tread mold side of the sidewall molding surface, it is determined that rubber biting occurs, and the outer side in the tire width direction than the minimum diameter part. When there is no raw tire in the step of determining that the rubber bite is not generated,
A method for judging rubber biting of a tire vulcanizer.   For at least one of the pair of side molds, if there is a raw tire on the outer side in the tire width direction than the minimum diameter portion, it is determined that rubber biting occurs, and both of the pair of side molds The method according to claim 1, further comprising the step of determining that no rubber biting occurs when there is no raw tire on the outer side in the tire width direction than the minimum diameter portion. A model setting unit for setting a vulcanizer model and a raw tire model including a pair of side molds having a contact surface with a tread mold and a sidewall molding surface, and a bladder that applies internal pressure to the raw tire;
From the initial state in which the pair of side molds are open, the bladder is inflated, the pair of side molds are closed, the green tire is held by the bladder and the pair of side molds, and the side is closed before the tread mold is closed. A vulcanization condition setting unit for setting vulcanization conditions up to the state,
Based on the vulcanizer model and the vulcanization conditions, a simulation execution unit that simulates deformation of the raw tire from the initial state to the side closed state;
In the side closed state, a position specifying unit that specifies the position of the raw tire on a virtual straight line connecting the contact surfaces;
If there is a raw tire on the outer side in the tire width direction than the minimum diameter part on the tread mold side of the sidewall molding surface, it is determined that rubber biting occurs, and the outer side in the tire width direction than the minimum diameter part. When there is no raw tire, a determination unit that determines that rubber biting is not occurring,
A rubber biting determination device for a tire vulcanizer.   The determination unit determines that at least one of the pair of side molds is in a state where rubber biting occurs when a raw tire is present on the outer side in the tire width direction than the minimum diameter portion, and the pair of side molds The apparatus according to claim 3, wherein for both the side molds, when there is no raw tire on the outer side in the tire width direction than the minimum diameter portion, it is determined that rubber biting does not occur.   The program which makes a computer perform the method of Claim 1 or 2.

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