JP4581671B2 - Method and apparatus for predicting cross-sectional shape during tire manufacture, computer program and information storage medium therefor - Google Patents

Description

  The present invention relates to a method and apparatus for predicting a cross-sectional shape at the time of manufacturing a tire for predicting a cross-sectional shape of a tire in an arbitrary process when manufacturing a pneumatic tire, a computer program thereof, and an information storage medium.

  When manufacturing a pneumatic tire, after forming a cylindrical raw tire in which a plurality of members constituting the tire are bonded together, the raw tire is put into a vulcanization mold (for example, a vulcanization mold). Vulcanized to produce tires as products.

  As is well known, the manufacturing process of a pneumatic tire is roughly divided into three processes: a first molding process, a second molding process, and a vulcanization process.

  In the first molding step, a green tire casing having a rotating body is formed by a carcass member, a pair of bead core members, a pair of bead filler members, and a pair of side tread members.

  In the second forming step, first, a tread / belt portion having a rotating body shape having a tread member and a belt member is formed. Next, the raw tire casing molded in the first molding step is arranged on the inner peripheral surface side of the tread / belt portion so that the central axis of the rotating body is aligned, and in this state, the raw tire casing is expanded to produce a raw tire casing. A tire casing is pressed against the inner peripheral surface of the tread / belt portion to form a green tire.

  In the vulcanization process, the green tire is placed in the vulcanization mold, and the elastic vulcanization bladder is expanded from the inner peripheral surface side of the green tire so that the green tire is shaped into the shape of the inner surface of the vulcanization mold. Expand to fit. Next, the temperature of the vulcanization mold and the vulcanization bladder is increased to vulcanize the expanded green tire.

  As described above, when manufacturing a pneumatic tire, the components of the tire are made cylindrical and deformed into a product tire shape. In addition, depending on the manufacturing conditions at that time, the manufacturing quality such as uniformity and appearance may be remarkably deteriorated.

  Also, depending on how the dimensions of the components of the tire are taken, there is a significant step on the surface of the green tire, or even if there is no step, the shape of the green tire and the shape of the vulcanization mold do not match well. When vulcanizing, production quality may be deteriorated.

  In order to solve such problems, the tire component, the vulcanization bladder, and the vulcanization mold are modeled and stresses in the tire manufacturing process using the well-known Finite Element Method (FEM). Alternatively, a method for examining changes such as strain and tension is used (for example, Japanese Patent Application Laid-Open No. 2003-225952).

In addition, for example, a tire simulation method disclosed in Japanese Patent Application Laid-Open No. 2003-200722, a large pneumatic tire manufacturing method disclosed in Japanese Patent Application Laid-Open No. 10-217349, and Japanese Patent Application Laid-Open No. 8-216154. And a technique such as a bladder used for the method of manufacturing a pneumatic radial tire disclosed in Japanese Patent Laid-Open No. 2004-259561 is known.
JP 20032259592 A Japanese Patent Laid-Open No. 2003-200722 JP-A-10-217349 JP-A-8-216154

  However, when the finite element method (FEM) as described above is used, it takes a long time to solve the problem because modeling and simulation itself take a lot of time. For example, it takes several hours per model, and it takes several days to analyze one case.

  The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to provide a method and an apparatus for predicting a cross-sectional shape at the time of manufacturing a tire capable of predicting a cross-sectional shape of a tire in an arbitrary manufacturing process in a short time. And providing the computer program and the information storage medium.

  In order to achieve the above object, the present invention provides a method for predicting a cross-sectional shape at the time of manufacturing a tire, in which a cross-sectional shape of a tire in a predetermined cross-sectional shape prediction target process from a tire forming process to a vulcanizing process is drawn using a computer. suggest. In this method, the computer device uses a predetermined function for determining the cross-sectional shape of the carcass, and based on the manufacturing condition information and the carcass structure specification information in the cross-sectional shape prediction target step, the carcass in the cross-sectional shape prediction target step. By performing a drawing process of geometrically arranging tire constituent members other than the carcass on the inside and outside of the carcass based on the structural specification information of the tire constituent members based on the obtained carcass sectional shape The cross-sectional shape of the tire in the cross-sectional shape prediction target process is drawn. This cross-sectional shape makes it possible to predict the cross-sectional shape at the time of tire manufacture.

  In order to realize the above method, the present invention is a cross-sectional shape prediction device at the time of manufacturing a tire that draws a cross-sectional shape of a tire in a predetermined cross-sectional shape prediction target process from a tire forming process to a vulcanization process. Manufacturing structure database in which tire structure specification information including tire structure information and tire member dimension information is stored in advance, and manufacturing condition information including information on the forming drum and bead position information at the time of manufacturing are stored in advance. Using a condition database and a predetermined function for determining the cross-sectional shape of the carcass, the structure specification information of the carcass and the manufacturing condition information in the cross-sectional shape prediction target process are extracted from the structure specification database and the manufacturing condition database, and the extracted structure Based on the specification information and manufacturing condition information, the cross-sectional shape of the carcass in the cross-sectional shape prediction target process And a cross-sectional shape of the tire in the cross-sectional shape prediction target step by performing a drawing process for geometrically arranging tire constituent members other than the carcass on the inside and outside of the carcass based on the obtained carcass cross-sectional shape The cross-sectional shape prediction apparatus at the time of tire manufacture which has a means to draw is comprised.

  According to the present invention, the cross-sectional shape of a tire in an arbitrary manufacturing process can be predicted in a short time. Further, the cross-sectional shape of the tire in the manufacturing process can be obtained from the structural specification information, and an appropriate vent hole position can be determined at the design stage. Furthermore, since the cross-sectional shape of the tire in the manufacturing process can be obtained in a very short time, it is possible to obtain a very excellent effect that the cause of the failure can be easily pursued.

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

  FIG. 1 is an external view showing an apparatus for predicting a cross-sectional shape at the time of manufacturing a tire in one embodiment of the present invention. FIG. 2 is a block diagram showing an electric circuit of the apparatus for predicting a cross-sectional shape at the time of manufacturing a tire in one embodiment of the present invention. is there. In the figure, 1 is a cross-sectional shape prediction device, 11 is a known computer body, 12 is a display (display device), 13 is a keyboard, 14 is a mouse, and 15 is a printer.

  The computer main body 11 includes a well-known CPU 111, a memory 112 including a ROM and a RAM, and a hard disk device 113. In the hard disk device 113, a manufacturing condition information database 114, a structure specification information database 115, a member correction coefficient database 116, and a mold shape information database 117 are constructed.

  The CPU 111 operates according to a program stored in the memory 112 and the hard disk device 113, and manufactures tires based on information such as tire type and cross-sectional shape prediction target process and instruction commands input via the keyboard 13 and the mouse 14. The plotting information drawn by simulating the cross-sectional shape of the tire in a predetermined process at the time is stored in the memory 112 and the hard disk device 113, and the plot of the tire cross-sectional shape is displayed on the display 12 or printed by the printer 15. The CPU 111 accesses the manufacturing condition information database 114, the structural specification information database 115, the member correction coefficient database 116, and the die shape information database 117 in the hard disk device 113 when simulating and drawing the cross-sectional shape of the tire. Information stored in these databases, that is, information necessary for drawing the cross-sectional shape of the tire in an arbitrary process is used.

  The production condition information database 114 includes, for each tire type, molding drum information such as the shape and diameter of the molding drum, inflation pressure information, bead position information at the time of manufacture, and a carcass line (carcass contour (cross-sectional boundary A function for obtaining the line)) is stored.

  The structural specification information database 115 stores, for each tire type, information such as the types of members constituting the tire, the arrangement and position of each member and their order, the width, thickness, and profile of each member.

  In the member correction coefficient database 116, for example, a correction coefficient table as shown in FIG. 3 is stored. In this correction coefficient table, a correction coefficient αn (n is a natural number) in the second molding process corresponding to each member name. And a correction coefficient βn (n is a natural number) in the vulcanization process. The correction coefficients αn and βn are preferably determined based on experimental results and geometric calculation values. Furthermore, the correction coefficients αn and βn can be set in common for all types of tires, but may be a function of the tire size, a function of the member expansion ratio, or a function of the curvature of the carcass line. Further, correction coefficients may be set individually such as αn1, αn2, βn1, and βn2 in the thickness direction and width direction of the member.

  The mold shape information database 117 stores information on the shape of the vulcanization mold for each tire type.

  Next, a cross-sectional shape prediction method using the above-described apparatus will be described. Here, operation | movement of the prediction apparatus 1 is demonstrated along the flowchart of FIG. 4 which shows the flow of the cross-sectional shape simulation by the processing program of CPU111.

  When predicting the cross-sectional shape at the time of manufacturing the tire, information on the tire type and cross-sectional shape prediction target process and an instruction command are input using the keyboard 13 and the mouse 14.

  When such information and an instruction command are input (SA1), the CPU 111 accesses the manufacturing condition information database 114 and the structural specification information database 115 to obtain a function for calculating a carcass line and member information on the shape of the carcass. Obtained (SA2), and using these, the carcass line is calculated (SA3).

  The above function derives the theoretical formula that determines the shape of the carcass line that is the skeleton of the tire from a very simple theory such as a membrane theory and a beam theory as a function, and any process in the vulcanization process from the tire molding process. The carcass line at that time can be obtained from the boundary conditions determined from the manufacturing conditions in FIG.

  Next, a carcass line is drawn based on the calculation result (SA4). Thereafter, information on each tire constituent member other than the carcass is obtained from the structural specification information database, and each tire constituent member other than the carcass is based on this information. Is repeatedly performed in the order of application (SA5). Furthermore, when this drawing process is a drawing process of a sectional view of the second molding step, a member correction process described later is performed. Thus, by arranging the respective tire constituent members other than the carcass inside and outside the carcass with the carcass line as a reference, the cross-sectional shape of the tire can be drawn. The completed drawing data is stored in the memory 112 and the hard disk device 113, and is drawn and displayed on the display 13 (SA6). An example of the drawing data corresponding to the first molding step is shown in FIG. 5, and an example of the drawing data corresponding to the second molding step is shown in FIG.

  In addition, if the member arrange | positioned inside a carcass is about an inner liner, the carcass line calculated | required as mentioned above may be made into the tire inner surface shape, and all the members may be arrange | positioned on it.

  According to this method, the calculation of the carcass line requires only a few seconds even if a computer with general performance is used, and other necessary tire components are geometrically superimposed on the obtained carcass line. Even if drawing processing time is added, the cross-sectional shape of the tire can be obtained in about one minute.

  Here, in the processes of SA2 to SA6, when the first molding process is input as the cross-sectional shape prediction target process, the carcass line is calculated based on the function corresponding to the first molding process, and the drawing data is generated. Further, when the second molding process or the vulcanization process is input as the cross-sectional shape prediction target process, the carcass line is calculated based on the function corresponding to the first molding process to generate the drawing data, and the determination of SA7 described later After performing the above, the carcass line is calculated based on the function corresponding to the second molding step to generate the drawing data. The details of the carcass line calculation process in the second molding step will be described later.

  Next, it is determined whether the cross-sectional shape prediction target process input in SA1 is the second molding process but the vulcanization process (SA7), and the cross-sectional shape in the first molding process and in the second molding process is determined. Stop processing when drawing is finished. Further, when it is the second molding step, the process proceeds to the processing of SA2, and when it is the vulcanization step, a sectional view at the time of vulcanization is drawn (SA8). In the cross-section creation process during vulcanization, the mold shape information corresponding to the tire type is acquired from the mold shape information database, and the cross-section creation process and the member correction process are performed based on the mold shape information. Then, the drawing data is stored in the memory 112 and the hard disk device 113 and is drawn and displayed on the display 13. An example of the drawing data at this time is shown in FIG.

  Next, a drawing process of a vulcanization extension drawing is performed (SA9). Regarding the expansion of the tire during vulcanization, each component in the tire cross-sectional view obtained by the above processing is expanded in the direction of the mold shape line in a predetermined direction at a constant size or a constant ratio. Reproduce the contact process. For example, the contact process to the mold shape line is reproduced by expanding each component member in the direction of the mold shape line in a direction such as a normal direction or the like at a constant size or a constant ratio.

  In the drawing process of the vulcanization extension drawing, the tire extension direction may be set to the normal direction of the carcass line, and the tire at that time may be extended to the mold side with a constant dimension such as 1 mm. Alternatively, it can be expanded to the mold side by 1/10 of the distance of the farthest distance, or it can be expanded to the mold side by 1/100 of the tire diameter. May be.

  Or, in the drawing process of this vulcanization extension drawing, the direction connecting the points where the mold line and the green tire are equally divided, that is, the distance from the center portion to the bead portion of the tire and the mold is divided by an arbitrary number of divisions, and the corresponding As a direction for connecting the dividing points, the tire at that time may be expanded to the mold side by a fixed dimension such as 1 mm. Alternatively, it can be expanded to the mold side by 1/10 of the distance of the farthest distance, or it can be expanded to the mold side by 1/100 of the tire diameter. May be.

  Thereafter, the drawing data of the completed vulcanization extension drawing is stored in the memory 112 and the hard disk device 113 and is drawn and displayed on the display 13. An example of the drawing data of the vulcanization extension diagram is shown in FIG.

  In each of the above drawing processes, the subordinate confirmation process is performed in parallel. That is, as a process for confirming the change in distortion of each member, the correction coefficient in the width direction is extracted from the member correction coefficient table of the member correction coefficient database, collated with a predetermined allowable range, and when the collation result is out of the allowable range. A warning is displayed on the display 12.

  Further, in the cross-section drawing process of the second molding step, the confirmation process of the change in the green tire shape depending on the bead position and the confirmation process of the bonding width between the first molding assembly and the belt / tread assembly are performed in determining the second molding condition. . In the confirmation process of the change in the green tire shape depending on the bead position, the magnitude of the strain of each member is extracted and collated with a predetermined allowable range. When the result of this collation is out of the allowable range, a warning is displayed on the display 12. Do. Further, in the confirmation process of the adhesion width between the first molded assembly and the belt tread assembly, the carcass length between points A and B in the carcass line calculation procedure described later is extracted and collated with a predetermined allowable range. When the result of this collation is outside the allowable range, a warning is displayed on the display 12.

  Furthermore, in the cross-section drawing process of the second molding step, a stitcher condition determination process that matches the shape of the green tire is performed. As stitcher condition determination processing, pressure switching position determination processing and pressing angle determination processing are performed. In the process of determining the pressure switching position, the adhesion width between the first molding assembly and the belt tread assembly is extracted, the width of the belt tread member is extracted from the structural specification information database, and the first molding assembly and the belt are extracted from the center. -Up to the bonding width of the tread assembly is set as a constant pressure region, from there to the belt member terminal is set as a high pressure region, and from there to the tread member terminal is set as a medium pressure region. In the pressing angle determination process, a drawn tire cross-sectional view is extracted, and a line intersecting the tire contour line at an arbitrary angle is output as a function of the z coordinate as the pressing angle at each position.

  Moreover, in the cross-section drawing process of a 2nd shaping | molding process, the confirmation process of a member terminal position and the confirmation process of a green tire surface unevenness | corrugation are performed as a quality confirmation process of a selection member. In the confirmation process of the member terminal position, the drawn tire sectional view is extracted, and the distance between the terminal position of each member and the reference position is automatically measured and collated with a predetermined allowable range. A warning is displayed. In the confirmation process of the green tire surface unevenness, the drawn tire cross-sectional view is extracted, the unevenness amount within the specified width of the tire outer surface is automatically measured and collated with a predetermined allowable range, and when it is out of the allowable range, the display 12 A warning is displayed.

  In the cross-section drawing process of the vulcanization process, the compatibility confirmation process of the installation location of the vent hole between the green tire shape and the gap between the molds is performed as the matching confirmation process of the vulcanization mold and the green tire. In the process of checking the gap between the molds, the drawn vulcanized cross section is extracted, the cross-sectional area and volume of the gap between the tire and the mold are automatically measured, collated with the predetermined allowable range, and out of the allowable range Performs a warning display on the display 12. In addition, in the compatibility check process of the vent hole installation location, the final installation location of the tire and the mold is extracted from the vulcanization extension diagram, and the amount of deviation from the specified vent hole installation position is automatically measured to obtain a predetermined range. When the value is outside the allowable range, a warning is displayed on the display 12.

  Further, in the cross-section drawing process of the vulcanization process, the confirmation process of the member terminal position and the confirmation process of the green tire surface unevenness are performed as the quality confirmation process of the selected member. In the confirmation process of the member terminal position, the drawn tire sectional view is extracted, and the distance between the terminal position of each member and the reference position is automatically measured and collated with a predetermined allowable range. A warning is displayed. In the confirmation process of the green tire surface unevenness, the drawn tire cross-sectional view is extracted, the unevenness amount within the specified width of the tire outer surface is automatically measured and collated with a predetermined allowable range, and when it is out of the allowable range, the display 12 A warning is displayed.

  As described above, according to the present embodiment, the information necessary for the simulation is only information on the manufacturing conditions, the widths of the constituent members, the dimensions of the gauges, the mold shape, and the like. If this is the case, there is no need to create a model, and even if a dozen patterns are simulated, it takes only a dozen minutes.

  Although the method of this embodiment cannot perform detailed analysis related to stress, the green tire in the manufacturing process is in an unvulcanized state, and the stress is easily relaxed because the green tire may become high temperature during vulcanization, Even in the analysis by the conventional method, it is rare to solve the problem by paying attention to the stress, and in general, the analysis is centered on strain and tension. Can be analyzed.

  Furthermore, in the present embodiment, the tire component changes in width, thickness, etc. due to expansion and contraction associated with the deformation of the entire tire, but after adding the correction of the member dimensions accompanying the deformation in a manner that matches the characteristics of each member, Since it is arranged on the obtained carcass line, an actual tire can be simulated more accurately. As described above, since this correction is also converted into a numerical value or a numerical expression using a theoretical formula or an experimental formula, a simulation in a short time can be realized.

  Therefore, the cross section of the tire in the cross-sectional shape prediction target process can be drawn accurately and in a short time, and manufacturing problems can be analyzed quickly.

  Next, the carcass line calculation process in the second molding step performed by the CPU 111 will be described with reference to FIGS. In FIG. 9, the vertical axis r represents the distance in the tire radial direction, and the horizontal axis z represents the distance in the tire axial direction.

  In the carcass line calculation process, the CPU 111 accesses the manufacturing condition information database 114 and the structural specification information database 115 to acquire and set initial values (SB1). The initial values set here are molding drum information such as the shape and diameter of the molding drum, inflation pressure information, bead position information at the time of manufacture, a function for obtaining a carcass line, and the types of members constituting the tire. These are values such as arrangement and pasting position and order of each member, width and thickness of each member, profile, and the like.

Next, the carcass line between points A and B shown in FIG. 9 is calculated using the following equation (1) considering the rigidity of the belt as a beam (SB2). Equation (1) is a function (r = f (z _AB )) representing displacement in the r direction, where EI is the bending stiffness of the belt + tread, and p is the internal pressure.

In the case of approximation with a high-order function, the displacement f (z _AB ) in the r direction may be obtained using the following approximate expression (2) or (3). Here, a, b, c, d are constants obtained experimentally.

Next, the carcass line between point C and point D shown in FIG. 9 is calculated using the following equation (4) considering the rigidity of the bead filler as a beam (SB3). Equation (4) is a function (r = f (z _CD )) representing the displacement in the r direction, where EI is the bending rigidity of the bead filler portion and p is the internal pressure.

In the case of approximating with a high-order function, the displacement f (z _CD ) in the r direction may be obtained using the following approximate expression (5) or (6). Here, a, b, c, d are constants obtained experimentally.

  Next, the carcass line between points B and C shown in FIG. 9 is calculated using the process shown in the flowchart of FIG. 11 in consideration of the diamond side portion as a film (SB4). That is, when the carcass line between points B and C shown in FIGS. 9 and 12 is calculated, the carcass line between AB and the carcass line between CDs obtained as described above are smoothly connected. For example, the connection angle is 30 degrees or less, and the entire carcass length is equal to the length set in the structural specification information database, and the error is, for example, 1 mm or less.

When calculating the carcass line between points B and C, an initial value is set (SC1), and the following equation (7) to (10) is used to calculate the distance between points B and C. The length of the carcass is calculated (SC2). Here, Expressions (7) and (8) are expressions representing the balance of forces, and Expressions (9) and (10) are geometric relational expressions. In these equations, p represents the internal pressure, t is the cord tension per carcass, N is the total number of cords, r ₁ is the radius of curvature, and φ is the carcass line between points B and C. Represents the angle formed by the normal and the z-axis at any point of z, and z ′ is a derivative of the function z of φ or r at any point on the carcass line from point B to point C once. Yes, z ″ is the derivative of the function z twice.

  Note that the carcass line between the points B and C may be calculated using a high-order function as described above.

  Next, the calculated length of the carcass is checked (SC3), and when the carcass length is outside the predetermined allowable range, the process proceeds to SC6 described later. When the carcass length is within a predetermined allowable range, the connection angle between the carcass line between the points A and B and the carcass line between the points C and D is calculated (SC4). The calculated connection angle is checked (SC5). As a result, when the connection angle is within a predetermined allowable range, the carcass line having the calculated length and connection angle is determined, and the process is terminated.

  When the calculated connection angle is out of the predetermined allowable range, the substitution value to the above equations (7) to (10) is changed (SC6), and the number of calculations is checked (SC7).

  As a result of this check, when the number of calculations is within a predetermined allowable range, the process proceeds to the process of SC2 and the processes of SC2 to SC5 are repeated using the changed substitution value. When the number of calculations is out of the allowable range, predetermined error processing is executed, and the fact that an error has occurred is displayed on the display 12 (SC8).

  Next, details of the above-described member correction processing will be described with reference to the flowchart of FIG.

  In the member correction process, information on the shape such as the width, thickness, and profile of the tire component to be corrected is acquired from the structural specification information database 115 (SD1), and thereafter, the correction coefficient is obtained from the member correction coefficient database 116. Obtain (SD2). When acquiring the correction coefficient, if the drawing process in the second molding process is being performed, the correction coefficient αn for the second molding process is acquired, and if the drawing process in the vulcanization process is being performed, the correction coefficient αn is being acquired. The correction coefficient βn is acquired.

  Next, the dimensions of the tire constituent members to be corrected acquired from the structural specification information database 115 are corrected using the correction coefficients αn and βn (SD3). For example, the correction is performed by multiplying the initial dimension by the correction coefficients αn and βn with the dimension of the tire constituent member to be corrected acquired from the structural specification information database 115 as the initial dimension.

  Thereafter, the drawing is performed using the dimensions of the tire constituent member subjected to the correction process (SD4).

In the above-described member correction processing, when one sheet-like member is considered, a case where the diameter of the member having a width W and a thickness H is wound around a drum having a radius r ₁ and then expanded to a radius r ₂ is considered. Rubber is generally assumed to have a Poisson's ratio of close to 0.5 and there is no volume change due to deformation, so there is no volume change before and after diameter expansion, so W × H × 2πr ₁ = W ′ × H ′ × 2πr ₂ If r ₁ <r ₂ , then W ′ × H ′ <W × H. Therefore, when drawing a member having a changed diameter, the accuracy of prediction is further improved by correcting the gauge and the width. This correction may be derived from the theoretical formula as described above. For example, when the diameter changes in an actual tire, it is examined how the width W and thickness H change, and an empirical formula is created to correct it. You may do it. In addition to the change in diameter, correction may be made for crushing / stretching by crimping, stretching at the time of application, and the like.

The external view which shows the cross-sectional shape prediction apparatus at the time of tire manufacture in one Embodiment of this invention The block diagram which shows the electric system circuit of the cross-sectional shape prediction apparatus at the time of tire manufacture in one Embodiment of this invention The figure which shows the correction coefficient table in one Embodiment of this invention. The flowchart explaining the processing operation of the cross-sectional shape prediction apparatus in one Embodiment of this invention. The figure which shows an example of the drawing data corresponding to the 1st shaping | molding process in one Embodiment of this invention. The figure which shows an example of the drawing data corresponding to the 2nd shaping | molding process in one Embodiment of this invention. The figure which shows an example of the plotting data corresponding to the vulcanization | cure process in one Embodiment of this invention The figure which shows an example of the drawing data of the vulcanization extension figure in one Embodiment of this invention The figure which shows the drawing data explaining the calculation process of the carcass line in one Embodiment of this invention The flowchart explaining the calculation process of the carcass line in one Embodiment of this invention The flowchart explaining the calculation process of the carcass line in one Embodiment of this invention The figure explaining the calculation process of the carcass line in one Embodiment of this invention The flowchart explaining the member correction | amendment process in one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cross-sectional shape prediction apparatus, 11 ... Computer main body, 12 ... Display (display device), 13 ... Keyboard, 14 ... Mouse, 15 ... Printer, 111 ... CPU, 112 ... Memory, 113 ... Hard disk device, 114 ... Manufacturing condition information Database 115, structural specification information database 116, member correction coefficient database 117, mold shape information database 117

Claims (11)

A method for predicting a cross-sectional shape at the time of manufacturing a tire, which draws a cross-sectional shape of a tire in a predetermined cross-sectional shape prediction target step from a tire forming step to a vulcanization step,
The computer device includes:
Using a predetermined function for determining the cross-sectional shape of the carcass, obtaining the cross-sectional shape of the carcass in the cross-sectional shape prediction target process based on the manufacturing condition information in the cross-sectional shape prediction target process and the structure specification information of the carcass;
The cross-sectional shape prediction target is obtained by performing a drawing process in which a tire constituent member other than the carcass is geometrically arranged on the inside and outside of the carcass based on the structural specification information of the tire constituent member on the basis of the obtained carcass cross-sectional shape. And a step of drawing a cross-sectional shape of the tire in the process.   The cross-sectional boundary line of each component member in the cross-sectional shape of the tire drawn corresponding to the cross-sectional shape prediction target process in the vulcanization process, using either a constant dimension or a constant ratio in a predetermined direction of the cross-sectional boundary line 2. The method of predicting a cross-sectional shape at the time of manufacturing a tire according to claim 1, wherein the step of drawing a cross-sectional shape of the tire being vulcanized by performing correction is executed.   The cross-sectional boundary line of each component member in the cross-sectional shape of the tire drawn corresponding to the cross-sectional shape prediction target process in the vulcanization process, using either a constant dimension or a constant ratio in the normal direction of the cross-sectional boundary line The method of predicting a cross-sectional shape at the time of manufacturing a tire according to claim 2, wherein the step of drawing the cross-sectional shape of the tire being vulcanized by performing correction is performed.   The cross-sectional boundary line of each component member in the cross-sectional shape of the tire drawn corresponding to the cross-sectional shape prediction target process in the vulcanization process has a constant size or a constant ratio in the direction connecting the equally divided points between the mold line and the green tire. 3. The method for predicting a cross-sectional shape at the time of manufacturing a tire according to claim 2, wherein the step of drawing the cross-sectional shape of the tire being vulcanized by performing correction using any one of the methods. A cross-sectional shape prediction device at the time of manufacturing a tire that draws a cross-sectional shape of a tire in a predetermined cross-sectional shape prediction target step from a tire forming step to a vulcanization step,
A structure specification database in which tire structure specification information including tire structure information and tire member size information is stored in advance;
Manufacturing condition database in which manufacturing condition information including information on the forming drum and bead position information at the time of manufacturing is stored in advance,
Using a predetermined function for determining the cross-sectional shape of the carcass, the structural specification information of the carcass and the manufacturing condition information in the cross-sectional shape prediction target process are extracted from the structural specification database and the manufacturing condition database, and the extracted structural specification information and manufacturing Based on condition information, means for obtaining a cross-sectional shape of the carcass in the cross-sectional shape prediction target step;
Means for drawing the cross-sectional shape of the tire in the cross-sectional shape prediction target step by performing a drawing process in which tire constituent members other than the carcass are geometrically arranged inside and outside the carcass based on the determined carcass cross-sectional shape; An apparatus for predicting a cross-sectional shape at the time of manufacturing a tire, comprising: A member correction coefficient database storing correction coefficient information for extending the cross-sectional boundary line in a predetermined direction of the cross-sectional boundary line of the tire constituent member;
The cross-sectional shape of the tire being vulcanized by correcting the position of the cross-sectional boundary line of each component member in the cross-sectional shape of the tire drawn corresponding to the cross-sectional shape prediction target step in the vulcanization step by using the correction coefficient information The cross-sectional shape prediction device at the time of manufacturing a tire according to claim 5, further comprising: A member correction coefficient database storing correction coefficient information for extending the cross-sectional boundary line in the normal direction of the cross-sectional boundary line of the tire constituent member;
The cross-sectional shape of the tire being vulcanized by correcting the position of the cross-sectional boundary line of each component member in the cross-sectional shape of the tire drawn corresponding to the cross-sectional shape prediction target step in the vulcanization step by using the correction coefficient information The cross-sectional shape prediction device at the time of manufacturing a tire according to claim 6, characterized by comprising: A member correction coefficient database in which correction coefficient information for expanding the cross-sectional boundary line in a direction connecting the mold line of the tire constituent member and the point obtained by equally dividing the green tire is stored;
The cross-sectional shape of the tire being vulcanized by correcting the position of the cross-sectional boundary line of each component member in the cross-sectional shape of the tire drawn corresponding to the cross-sectional shape prediction target step in the vulcanization step by using the correction coefficient information The cross-sectional shape prediction device at the time of manufacturing a tire according to claim 6, characterized by comprising: The cross-sectional shape prediction device at the time of manufacturing a tire according to any one of claims 5 to 8, further comprising means for displaying a cross-sectional shape of the drawn tire. A computer program for drawing a cross-sectional shape of a tire in a predetermined cross-sectional shape prediction target step from a tire forming step to a vulcanization step using a computer, and predicting a cross-sectional shape at the time of tire manufacture,
The computer program characterized by including the processing step in any one of the said Claim 1 thru | or 4. A computer in which a computer program for drawing a cross-sectional shape of a tire in a predetermined cross-sectional shape prediction target process from a tire forming process to a vulcanizing process using a computer and predicting a cross-sectional shape at the time of tire manufacture is stored A readable information storage medium,
An information storage medium in which the computer program according to claim 10 is stored.

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