JP5566094B2 - Tire molding shape simulation apparatus, simulation method, and program - Google Patents

Description

  The present invention relates to a tire forming shape simulation apparatus, a simulation method, and a program for simulating a forming shape of a tire formed by laminating rubber ribbons.

  Various types of tires such as pneumatic tires are manufactured by sequentially arranging tire constituent members made of unvulcanized rubber or the like on a molded body to form an unvulcanized tire, and then vulcanizing and molding the tire. At the time of molding the tire, conventionally, a rubber ribbon made of unvulcanized rubber is spirally wound around a molded body and laminated to form a tire constituent member such as tread rubber (Patent Documents 1 and 2). reference).

  Moreover, in the tire which laminates | stacks and shape | molds a rubber ribbon, the shaping | molding shape of the tire which laminated | stacked the rubber ribbon was simulated with a simulation apparatus, and the lamination | stacking state of a rubber ribbon may be confirmed. However, in such a conventional simulation apparatus, it is common to calculate one cross-sectional view in the tire width direction in a state where rubber ribbons are laminated at a constant angle (usually 0 °) with respect to the circumferential direction. Therefore, the lamination state of the rubber ribbon can be confirmed only in a certain lamination manner and in a cross-sectional shape at one place in the circumferential direction, and when the deviation of the lamination and the variation in the lamination thickness occur along the circumferential direction. Difficult to judge them. Therefore, conventionally, before starting production of tires, it is necessary to actually laminate tires with a plurality of patterns and prototype tires, check the lamination state of each rubber ribbon, and grasp the occurrence of problems with lamination, It takes a lot of time and effort to confirm the lamination state, and there is a tendency for the number of prototypes to increase.

JP 2004-35838 A JP 2005-246845 A

  The present invention has been made in view of such a conventional problem, and the object thereof is to obtain a molding shape of the entire tire circumferential direction by laminating rubber ribbons by simulation and laminating without actually laminating rubber ribbons. It is to make it easy to check the status.

The present invention relates to a tire molding shape simulation apparatus for simulating a tire molding shape formed by laminating rubber ribbons using a tire molding model, in a circumferential direction at a reference position in the circumferential direction of the tire molding model. Means for setting the placement position of rubber ribbons that are continuously arranged around the circumference, means for cutting and unfolding the laminated surface of the rubber ribbon of the tire molding model at the reference position, obtaining the developed laminated surface, and the set placement position of the rubber ribbon A means for determining a lamination position of the rubber ribbon on the development lamination surface, a means for calculating the lamination thickness of the rubber ribbon on the development lamination surface based on the lamination position of the rubber ribbon and a predetermined thickness of the rubber ribbon, the provided, means for determining a stacking position of the rubber ribbon, rubber ribbon to suit each position of the rubber ribbon on both cut open end of the deployment stacking surface Comprising means for setting the part position, and means for calculating the stacking position of the rubber ribbon on the development layer surfaces connecting the end position between the corresponding rubber ribbon in both cut open end and calculates a lamination thickness of the rubber ribbon The means stacks the value of the thickness of the rubber ribbon in the normal direction of the developed laminated surface by the number of overlaps of the rubber ribbon laminated on the developed laminated surface, and the laminated thickness of the rubber ribbon over the entire developed laminated surface. It has the means to calculate.
In addition, the present invention is a program for realizing each means of the tire molding shape simulation apparatus by a computer.
Furthermore, the present invention relates to a tire molding shape simulation method in a simulation apparatus for simulating a molding shape of a tire formed by laminating rubber ribbons using a tire molding model, and a circumferential reference position of the tire molding model The step of setting the arrangement position of the rubber ribbon that is continuously arranged in the circumferential direction, the step of opening the laminated surface of the rubber ribbon of the tire molding model at the reference position and developing it, the step of obtaining the developed laminated surface, The step of determining the lamination position of the rubber ribbon on the development lamination surface based on the set arrangement position, and the lamination thickness of the rubber ribbon on the development lamination surface based on the lamination position of the rubber ribbon and the preset thickness of the rubber ribbon. includes a step of calculating, the step of determining a stacking position of the rubber ribbon, rubber ribbon on both cut open end of the deployment stacking surface A step of setting the end position of the rubber ribbon in accordance with each arrangement position, and a step of calculating the position of the rubber ribbon on the development lamination surface by connecting the end positions of the corresponding rubber ribbons of the two open ends. The process of calculating the laminated thickness of the rubber ribbon accumulates the value of the thickness of the rubber ribbon in the normal direction of the developed laminated surface by the number of overlapping rubber ribbons laminated on the developed laminated surface. And a step of calculating the laminated thickness of the rubber ribbon.

  According to the present invention, the entire shape of the tire in the circumferential direction by lamination of rubber ribbons can be obtained by simulation, and the lamination state can be easily confirmed without actually laminating rubber ribbons.

It is a functional block diagram which shows schematic structure of the simulation apparatus of the tire shaping | molding shape of this embodiment. It is a figure showing typically the tire fabrication model of this embodiment. It is a flowchart which shows the procedure of the simulation process of the tire shaping | molding shape of this embodiment. It is a figure for demonstrating the setting of the arrangement position of a rubber ribbon. It is a schematic plan view which shows the expansion | deployment lamination | stacking surface of a tire shaping | molding model. It is a figure which shows typically the state which laminated | stacked the rubber ribbon on the expansion | deployment lamination | stacking surface of FIG. It is a figure which shows the lamination | stacking thickness of the rubber ribbon on an expansion | deployment lamination | stacking surface.

Hereinafter, an embodiment of a simulation apparatus and a simulation method for a tire molding shape according to the present invention will be described with reference to the drawings.
A tire molding shape simulation apparatus (hereinafter, referred to as a simulation apparatus) according to the present embodiment is a simulator that simulates the molding shape of a tire formed by laminating rubber ribbons, and calculates the tire molding shape using a tire molding model. To simulate. The rubber ribbon is a rubber member (rubber strip) made of unvulcanized rubber formed in a ribbon shape having a predetermined cross-sectional shape, which is laminated on a molded body at the time of tire molding. The tire molding model is a virtual model in which the tire being molded is modeled.

FIG. 1 is a functional block diagram showing a schematic configuration of the simulation apparatus of the present embodiment.
The simulation apparatus 1 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory) that stores various programs for simulation processing, and a RAM (Random Access Memory) that temporarily stores data directly accessed by the CPU. It is comprised from the computer provided with etc. Moreover, the simulation apparatus 1 has each means (functional part) mentioned later which performs the process regarding simulation as a function implementation | achievement means obtained by executing the program stored in ROM by CPU.

  Specifically, as shown in the figure, the simulation apparatus 1 includes a simulation unit 10 that simulates a tire molding shape, an input / output unit 2, and a storage unit 3, which are connected to each other via a bus 15. It is connected. The input / output unit 2 is an interface for inputting / outputting data by connecting to an external device. The input device 4 such as a keyboard and a mouse used for inputting and operating data and commands by the user, and various simulation-related items for the user. A display device 5 for displaying the information is connected. The storage unit 3 stores various data related to simulation, for example, simulation setting conditions, tire molding models, rubber ribbon dimensions and shapes, simulation results, and the like.

  The simulation apparatus 1 receives the above-described data related to the simulation from the user via the input device 4 in advance and stores them in the storage unit 3. The simulation unit 10 reads out the data from the storage unit 3 and uses them. To do. The simulation unit 10 simulates the tire molding shape based on each data, stores the result in the storage unit 3, and outputs it to the display device 5 to display it in a predetermined format. The simulating unit 10 includes a rubber ribbon arrangement position setting unit 11, a development lamination surface acquisition unit 12, a rubber ribbon lamination position determination unit 13, and a lamination thickness calculation unit 14. Thus, each simulation process is executed using the tire molding model.

FIG. 2 is a diagram schematically showing a tire molding model, and shows a cross-sectional view in the width direction taken along a plane including the shaft core as an example.
The tire molding model 20 includes a plurality of tire constituent members such as a carcass 22 extending in a toroidal shape between a pair of bead cores 21, a belt 23 on the outer peripheral side of the carcass 22, and rubber between outer surfaces and members, as illustrated. It consists of data. In addition, the data includes the location, shape, and dimensions of each tire component, the relationship with other tire components, and the order of molding and placement. From these, it corresponds to the tire at each stage of molding. A tire molding model 20 is constructed. Thereby, as for the tire shaping | molding model 20, the inner / outer surface and the whole shape, dimension, and internal structure are set.

  In the present embodiment, the tire molding model 20 at the stage where the tread rubber is arranged next is used, and the tire molding when the tread rubber is molded by laminating the rubber ribbon R on the laminated surface 24 having the unevenness as the outer peripheral surface thereof. The shape (laminated shape of the rubber ribbon R) is simulated. At that time, the rubber ribbon R is gradually displaced in the width direction while being wound in the circumferential direction of the tire molding model 20, wound around the laminated surface 24 in a spiral manner, and continuously arranged around the circumference (only a part is shown in the figure). To calculate the shape when stacked. Hereinafter, based on this lamination condition, the procedure and flow of the process of simulating the tire molding shape by the simulation device 1 and the tire molding shape simulation method in the simulation device 1 will be described.

FIG. 3 is a flowchart showing the procedure of the tire forming shape simulation process by the simulation apparatus 1.
In the simulation apparatus 1, as shown in the figure, first, based on a user's designation, the simulation unit 10 acquires a pre-stored tire molding model 20 of a tire to be molded from the storage unit 3 (S 101). Next, the arrangement position setting unit 11 sets the arrangement position of the rubber ribbon R with respect to the laminated surface 24 based on the arrangement position data of the rubber ribbon R input by the user (S102).

FIG. 4 is a diagram for explaining the setting of the arrangement position of the rubber ribbon R, and shows a schematic shape by enlarging the F range of FIG. 2.
Here, the arrangement position of the rubber ribbon R is set with respect to the laminated surface 24 of the rubber ribbon R at a circumferential reference position K set at a predetermined circumferential position of the tire molding model 20 as illustrated. That is, this arrangement position is the position of each rubber ribbon R arranged on the laminated surface 24 in the cross section of the tire molding model 20 in the width direction (left and right direction in FIG. 4). Multiple inputs are made along the direction. Based on this, the arrangement position setting unit 11 sets the arrangement position of the rubber ribbon R that is continuously arranged in the circumferential direction at the reference position K in the circumferential direction of the tire molding model 20.

  At this time, the winding order of the tire molding model 20 is set together with the arrangement position of the rubber ribbon R. For example, the Nth roll is a rubber ribbon R (N), the N + 1th roll is a rubber ribbon R (N + 1), and the N + 2th roll is a rubber ribbon. R (N + 2) is set. Further, in the illustrated example, the rubber ribbons R are arranged at positions spaced apart in order along the width direction, and the arrangement positions separated from each other are set on the laminated surface 24. Subsequently, the simulation apparatus 1 uses the developed laminated surface acquisition unit 12 to open the laminated surface 24 on which the rubber ribbon R of the tire molding model 20 is laminated at the reference position K described above, and change the shape from a cylindrical shape to a planar shape. Development is performed to acquire a developed laminated surface (S103 in FIG. 3).

FIG. 5 is a schematic plan view showing a developed laminated surface of the tire molding model 20, and the circumferential position of the tire molding model 20 is also indicated by an angle A (°) from the reference position K, respectively.
The developed laminated surface acquisition unit 12 cuts the laminated surface 24 of the rubber ribbon R of the tire molding model 20 and develops it on a developed laminated surface 24T having a rectangular shape in plan view as shown in the drawing. In the developed laminated surface 24T, the cut ends (upper and lower ends in the figure) on both sides corresponding to the cut-open side correspond to the reference position K of the tire molding model 20, and the circumferential positions are 0 ° and 360 °, respectively.

  The rubber ribbon R is disposed from the disposition position set at the reference position K of 0 ° to the position of 360 ° along the circumferential direction with respect to the development laminated surface 24T, wound once, and then continuously wound by 0 °. They are arranged in the circumferential direction from the next arrangement position set at the reference position K. In this way, the rubber ribbon R is continuously arranged in the circumferential direction in a plurality of circumferences and laminated on the development lamination surface 24T. Therefore, the N-th rubber ribbon R (N) arranged from the 0 ° position is arranged at the arrangement position of the next N + 1-th rubber ribbon R (N + 1) at the 360 ° position. Similarly, the rubber ribbon R (N + 1) is disposed at the position of the next N + 2 roll rubber ribbon R (N + 2) at a position of 360 °. However, the rubber ribbon R (N + 2) to be wound last is linearly arranged along the circumferential direction, and is arranged at the same arrangement position even at a position of 360 °. The simulation apparatus 1 calculates the lamination position of the rubber ribbon R arranged on the development lamination surface 24T by calculating by the lamination position determination unit 13 based on the arrangement condition of the rubber ribbon R.

  The lamination position determination unit 13 first matches the rubber ribbon R with the two cut ends (reference position K) of the developed lamination surface 24T according to the arrangement positions (see FIG. 4) of the rubber ribbon R set by the arrangement position setting unit 11. Set the end position of. At that time, the end position (see FIG. 5) is set so as to coincide with the set arrangement position of the rubber ribbon R at the 0 ° open end. On the other hand, at the 360 ° open end, as described above, the end position is set to the arrangement position set to the rubber ribbon R to be wound next, and only the rubber ribbon R (N + 2) to be wound last is the same end as the arrangement position. Set the position. Thereby, the end positions (cut end positions) of the developed rubber ribbons R (N), R (N + 1), and R (N + 2) are set at both cut ends of the spread laminated surface 24T.

  Next, the lamination position determination unit 13 connects the end positions of the corresponding rubber ribbons R at the two open ends (two-dot chain line in FIG. 5), and calculates the lamination position of the rubber ribbon R on the developed lamination surface 24T. Specifically, the X coordinate is set along the width direction of the tire molding model 20 with respect to the development laminated surface 24T, the X coordinate at each circumferential position (angle) of the rubber ribbon R is calculated, and the rubber ribbon R The X coordinate over the whole circumferential direction is acquired. At this time, for example, in the rubber ribbon R (N), the X coordinate at the angle A is X (A), the X coordinate at 0 ° is X (N), and the X coordinate at 360 ° (= 0 of the rubber ribbon R (N + 1)). X (A) is calculated by the following equation (Equation 1), where X (N coordinates) in degrees is X (N + 1).

  The stacking position determination unit 13 calculates the X coordinate of the rubber ribbon R connecting the end positions with a full angle A at a predetermined position in the width direction (for example, the end or the center) using this calculation formula. Further, the X coordinate of each part in the width direction of the rubber ribbon R is calculated based on the preset width of the rubber ribbon R, and the lamination position of each rubber ribbon R is obtained. However, the rubber ribbon R (N + 2) wound lastly has an X coordinate at 0 ° as a lamination position in the entire circumferential direction. In this way, the lamination position determination unit 13 determines the lamination position of the rubber ribbon R on the developed lamination surface 24T based on the arrangement position of the rubber ribbon R set by the arrangement position setting unit 11 (FIG. 3, S104). Next, the lamination thickness calculation unit 14 reads out the preset thickness of the rubber ribbon R from the storage unit 3, and based on the decided lamination position of the rubber ribbon R and the preset thickness, on the development lamination surface 24T. The thickness of the rubber ribbon R is calculated (FIG. 3, S105).

FIG. 6 is a diagram schematically showing a state in which the rubber ribbon R is laminated at each lamination position of the developed lamination surface 24T of FIG.
The laminated thickness calculation unit 14 adds the thickness to the rubber ribbon R and calculates the Y coordinate set in the normal direction of the developed laminated surface 24T. For the Y coordinate, the value for the thickness is added at each lamination position of the rubber ribbon R, and the value for the thickness is accumulated in the normal direction by the number of overlaps at the overlapping portion of the rubber ribbon R, and the entire laminated surface 24T is spread. To calculate. Thereby, the lamination thickness calculation unit 14 calculates the Y coordinate of all the rubber ribbons R laminated on the development lamination surface 24T and the lamination thickness of each part of the rubber ribbon R corresponding to the Y coordinate.

FIG. 7 is a view showing the laminated thickness of the rubber ribbon R on the developed laminated surface 24T, and is a display example on the display device 5 schematically showing the laminated thickness divided for each thickness.
As shown in the figure, the simulating unit 10 calculates the laminated thickness of the rubber ribbon R, discriminates the laminated shape of the rubber ribbon R on the developed laminated surface 24T from the calculation result, and the tire according to the laminated shape and the laminated shape. A molding shape is acquired (FIG. 3, S106). In this way, the simulation apparatus 1 simulates the molded shape of the tire formed by laminating the rubber ribbon R using the tire molding model 20, and acquires the tire molded shape including the laminated shape of the rubber ribbon R, The simulation process ends.

  As described above, in the present embodiment, the tire molding model 20 is used to determine the lamination position of the rubber ribbon R on the development lamination surface 24T and calculate the lamination thickness. The entire shape in the circumferential direction can be obtained by simulation. Therefore, it is possible to easily and accurately check the lamination state without actually stacking the rubber ribbon R to make a tire prototype, and to easily check the lamination state with various lamination patterns by changing the lamination pattern of the rubber ribbon R. it can. Along with this, before starting production of the tire, it is possible to grasp in advance the problems associated with the lamination of the rubber ribbon R, and accurately determine whether or not there is a deviation in the lamination or a variation in the lamination thickness along the circumferential direction, An optimum lamination pattern can be determined. In addition, it is possible to significantly reduce the labor and time required for checking the lamination state and the number of trial manufacturing steps of the tire, thereby reducing the production cost of the tire.

  In addition, when setting the arrangement position of the rubber ribbon R at the reference position K (see FIG. 4) of the tire molding model 20, each arrangement position may be set arbitrarily, and a plurality of arrangement positions may be set at the same interval. It may be set at intervals different from each other. At this time, the arrangement position of the rubber ribbon R may be set by overlapping a part or the whole in the normal direction of the laminated surface 24. Further, the tire constituent member formed by laminating the rubber ribbon R is not limited to the tread rubber, but may be other tire constituent members such as a sidewall rubber. You can get it. In addition, this invention can also be made into the program for implement | achieving each means which performs the process demonstrated above of the tire shaping shape simulation apparatus 1 with a computer.

  DESCRIPTION OF SYMBOLS 1 ... Tire shaping | molding shape simulation apparatus, 2 ... Input-output part, 3 ... Memory | storage part, 4 ... Input device, 5 ... Display apparatus, 10 ... Simulation part, 11 * ··· Arrangement position setting unit, 12 ··· Laminated laminated surface acquisition unit, 13 ··· Lamination position determination unit, 14 ··· Lamination thickness calculation unit, 15 ··· Bus, 20 ··· Tire molding model, 24: Laminated surface, 24T: Unfolded laminated surface, K: Reference position, R: Rubber ribbon.

Claims (3)

A tire molding shape simulation device that simulates a molding shape of a tire formed by laminating rubber ribbons using a tire molding model,
Means for setting an arrangement position of a rubber ribbon arranged continuously in the circumferential direction at a reference position in the circumferential direction of the tire molding model;
Means for cutting and unfolding the laminated surface of the rubber ribbon of the tire molding model at a reference position and obtaining the unfolded laminated surface;
Means for determining a lamination position of the rubber ribbon on the development lamination surface based on the set arrangement position of the rubber ribbon;
A means for calculating a lamination thickness of the rubber ribbon on the development lamination surface based on a lamination position of the rubber ribbon and a predetermined thickness of the rubber ribbon, and
The means for determining the laminating position of the rubber ribbon includes a means for setting the end position of the rubber ribbon in accordance with each arrangement position of the rubber ribbon at both open ends of the development lamination surface, and the end positions of the rubber ribbons corresponding to the both open ends. And means for calculating a lamination position of the rubber ribbon on the development lamination surface,
The means for calculating the laminated thickness of the rubber ribbon accumulates the value of the thickness of the rubber ribbon in the normal direction of the developed laminated surface by the number of overlapping rubber ribbons laminated on the developed laminated surface. A tire molding shape simulation apparatus characterized by having means for calculating the laminated thickness of the rubber ribbon. The program for implement | achieving each means of the simulation apparatus of the tire shaping | molding shape described in Claim 1 by computer . A tire molding shape simulation method in a simulation apparatus for simulating a molding shape of a tire formed by laminating rubber ribbons using a tire molding model ,
A step of setting an arrangement position of a rubber ribbon arranged continuously in the circumferential direction at a reference position in the circumferential direction of the tire molding model;
Cutting and unfolding the laminated surface of the rubber ribbon of the tire molding model at the reference position and obtaining the unfolded laminated surface;
A step of determining a lamination position of the rubber ribbon on the development lamination surface based on the set arrangement position of the rubber ribbon;
A step of calculating a lamination thickness of the rubber ribbon on the development lamination surface based on a lamination position of the rubber ribbon and a predetermined thickness of the rubber ribbon,
The step of determining the lamination position of the rubber ribbon includes the step of setting the end position of the rubber ribbon in accordance with each arrangement position of the rubber ribbon at the two open ends of the development lamination surface, and the end positions of the corresponding rubber ribbons of the two open ends. And connecting the rubber ribbon on the development lamination surface to calculate the lamination position,
The process of calculating the thickness of the rubber ribbon stacks the value of the thickness of the rubber ribbon in the normal direction of the developed laminated surface by the number of overlapping rubber ribbons laminated on the developed laminated surface, A method for simulating a tire shape, comprising a step of calculating a laminated thickness of the rubber ribbon.

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