JP4887919B2 - Tire mold member inspection method, tire mold member inspection apparatus, and mold member manufacturing process accuracy inspection method - Google Patents

Description

  The present invention relates to a method and apparatus for inspecting the shape accuracy of a mold member for tire production, which is produced based on three-dimensional shape design data corresponding to the shape of the tread surface of the tire to be produced, and the tread surface of the tire to be produced. A plurality of different parts in the tire production mold member production process in which the shape of the master mold member produced based on the three-dimensional shape design data corresponding to the shape is repeatedly transferred, and the mold members of different materials are sequentially produced each time the transfer is performed. The present invention relates to a method for inspecting shape transfer accuracy between the transfer processes.

  Needless to say, a tire vulcanization mold having a highly accurate shape is required to produce a tire having a highly accurate shape. Such a mold for tire vulcanization generally employs a partial mold. The partial mold includes an upper and lower side mold, and a segment mold that is divided into a plurality of pieces so as to form a radially dividing surface. By arranging such a plurality of partial molds in combination, the entire tire vulcanization mold is configured.

Conventionally, attention has been focused only on a state in which these partial molds are mounted on a vulcanizer (a state in which a tire vulcanization mold is configured) as an element for producing a highly accurate tire. For this reason, conventionally, a plurality of partial molds such as a tread segment mold are arranged in the same manner as in a state where they are attached to a vulcanizer, and in this arrangement state, they correspond to the inner peripheral surface of the tread segment (that is, the tread surface of the tire). Surface) was measured for one round (for example, Patent Document 1 and Patent Document 2 below). For example, Patent Document 3 discloses a method of measuring the shape of the inner peripheral surface of each of the plurality of tread segment molds and synthesizing the measured shape data as peripheral surface data for one round.
JP 2002-257537 A JP 2003-266445 A JP 2005-271536 A

  When actually manufacturing a tire, a some partial mold is arrange | positioned at a vulcanizer. When placed in a vulcanizer, the shape and thickness of the back surface, which is the surface of the partial mold facing the tire surface, is important, not the inner peripheral surface of the partial mold (surface corresponding to the tire surface). Come. In order to manufacture a highly accurate tire, the overall manufacturing accuracy including such a surface in the partial mold is important. In the above Patent Documents 1 to 3, all of them only measure the inner peripheral surface of the partial mold, and the method for measuring the shape of the other surface of the partial mold, and the method for inspecting the production accuracy, etc. There is no suggestion. An object of the present invention is to provide a method and an apparatus for inspecting the overall shape accuracy of a mold member for producing a tire, including portions other than the surface corresponding to the tire surface.

  In addition, such a mold member repeatedly transfers the shape of the master mold produced based on the three-dimensional shape design data corresponding to the tread surface shape of the tire to be produced. Produced sequentially. Another object of the present invention is to provide a tire mold member inspection method and a tire mold member inspection apparatus that can inspect each of the various transfer stages that determine the production accuracy of the entire partial mold.

In order to solve the above problems, the present invention is a method for inspecting the shape accuracy of a mold member for tire production, which is produced based on three-dimensional shape design data corresponding to the tread surface shape of a tire to be produced. The three-dimensional shape design data is acquired, the three-dimensional shape of the mold member is measured, and the mold member three-dimensional measurement data acquired by measurement is compared with the three-dimensional design data of the mold member. The amount of deviation of the shape of the produced mold member from the three-dimensional design data is derived, and the mold member divides the tread surface shape for one round of the tire into a plurality of portions along the tire circumferential direction. the plurality of partial molds, each with corresponding one of the partial shape forming the tire mold by is disposed linked or, a master mold for making the part mold, the mold When measuring the three-dimensional shape of the material, at least a part of the surface shape of the mounting plane and the mold in a state where the mold member is mounted on the mounting plane of the substrate having the mounting plane. Measure and compare the three-dimensional shape of the tire surface, which is the surface portion corresponding to the tread surface shape, among the members, and at least part of the member back surface, which is the surface of the mold member facing the tire surface. In this case, based on the three-dimensional measurement data of the mounting plane, the three-dimensional measurement data of the tire surface of the mold member, and the three-dimensional measurement data of the rear surface of the mold member, A measurement data reference point is set, the measurement data reference point and the design data reference point in the three-dimensional design data corresponding to the measurement data reference point are matched, 3D design data is arranged on the same coordinate space, and in this arrangement state, a deviation amount between the 3D measurement data and the 3D design data of the mold member is derived. Provide a method.

  In addition, the part of the rear surface of the member includes at least an arrangement reference point serving as a reference for the arrangement position of the partial mold when the partial mold is arranged in a vulcanizer for manufacturing a tire. It is preferable that a point corresponding to the arrangement reference point is extracted from the three-dimensional measurement data of the mold member, and the extracted point is set as the measurement data reference point.

  The mold member includes a mounting surface parallel to a plane passing through the tire surface corresponding to the equator plane of the tire to be manufactured, and when measuring the three-dimensional shape of the mold member, the mounting surface described above And the placement surface of the substrate are in contact with each other, and the mold member is placed on the placement plane, at least a part of the surface shape of the placement plane, and the mold member The three-dimensional shape of the tire surface and the part of the member back surface is measured, the surface shape of a part of the mounting plane measured above, the tire surface of the mold member, and the part of the member back surface It is preferable to set the measurement data reference point using the three-dimensional measurement data.

  Further, the member back surface of the mold member includes at least a vertical surface portion substantially perpendicular to the mounting surface, and when measuring the three-dimensional shape of the mold member, the mounting surface and the mounting surface described above In a state where the mold member is placed on the placement plane and the vertical surface portion is perpendicular to the placement surface, at least a part of the surface shape of the placement plane, It is preferable to measure a three-dimensional shape of the tire surface of the mold member and the vertical surface portion.

  In the comparison, based on the three-dimensional measurement data of the mounting plane, a first plane corresponding to the mounting plane is set, and the first plane is set using the three-dimensional measurement data of the tire surface. A second plane passing through the tire surface parallel to the plane is set, and a line connecting the surface represented by the three-dimensional measurement data of the tire surface and the second plane and a straight line connecting both ends of the line of intersection. Extract a plurality of combinations of two different intersections with each of a plurality of different parallel straight lines, derive the midpoint of each of the line segments connecting the two intersections in each combination, Based on this, the approximate straight line that approximates the midpoint as a point on the same straight line is derived, a third plane perpendicular to the first plane including the approximate straight line is set, and the set third plane and A line of intersection with the back of the member is derived and this line of intersection is derived. The midpoint, it is preferable to set as the reference point.

  The three-dimensional shape measurement data of the mold member is acquired using a three-dimensional scanner, and the three-dimensional scanner irradiates the mold member with projection light, and the projection light from the surface of the mold member. By detecting reflected light, three-dimensional measurement data of the mold member is obtained. When irradiating light on at least a part of the surface of the mold member, the projection light is applied to the mold member via a mirror. It is preferable to detect the reflected light of the projection light from the surface of the mold member through the mirror.

  Further, the display output step of displaying on the display screen at least one of the shape represented by the three-dimensional shape measurement data measurement data and the shape represented by the three-dimensional shape design data. It is preferable to display the measurement points for which the deviation amount is determined to be larger than a predetermined design tolerance value in a display form different from other measurement points.

  Furthermore, it is preferable to have a step of marking at a position corresponding to a measurement point where the deviation amount is determined to be larger than the design tolerance value.

Further, the present invention is a method for inspecting the shape accuracy of a mold member for tire production, which is produced based on the three-dimensional shape design data corresponding to the tread surface shape of a tire to be produced. The mold member produced by acquiring data, measuring the three-dimensional shape of the mold member, and comparing the three-dimensional measurement data of the mold member acquired by measurement with the three-dimensional design data of the mold member The shape member is one of partial shapes obtained by dividing the tread surface shape for one round of the tire into a plurality of portions along the tire circumferential direction. a plurality of partial molds forming a tire mold by respectively with corresponding is arranged connected to or, a master mold for making the part mold, measuring the three-dimensional shape of the mold member When the mold member is placed on the placement plane of the substrate having the placement plane, at least a surface shape of at least a part of the placement plane and the tread surface shape of the mold member The three-dimensional shape of the tire surface, which is the surface portion corresponding to the above, is measured, and at the time of comparison, based on the three-dimensional measurement data of the mounting plane described above and the three-dimensional measurement data of the tire surface of the mold member Deriving at least one point on the design center axis corresponding to the center axis of the tire to be set , setting the derived point as a measurement data reference point in the mold member three-dimensional measurement data, setting a measurement data reference point , By matching the measurement data reference point with the design data reference point in the three-dimensional design data corresponding to the measurement data reference point, the mold member three-dimensional measurement data and the three-dimensional design data are matched. Are arranged in the same coordinate space, and in this arrangement state, a deviation amount between the three-dimensional measurement data and the three-dimensional design data of the mold member is derived. Based on the dimensional measurement data, a first plane corresponding to the mounting plane is set, and a second plane passing through the tire plane parallel to the first plane using the three-dimensional measurement data of the tire surface. And a plurality of combinations of two different points are extracted from the intersection line between the surface represented by the three-dimensional measurement data of the tire surface and the second plane, and a plurality of line segments connecting the two points of each combination are extracted. An axis center point representing all the intersections of two different perpendicular bisectors in each of the perpendicular bisectors and approximating the points on the design center axis based on the plurality of derived intersections A line passing through this axis and perpendicular to the first plane; The deviation amount of the position other than the measurement data reference point of the three-dimensional measurement data is derived by matching the center axis of the three-dimensional design data of the mold member corresponding to the center axis of the tire to be produced. There is also provided a method for inspecting a tire mold member .

  Moreover, it is preferable to derive the barycentric point of a plurality of derived intersections as the axial point.

  Further, the three-dimensional design data of the mold member is three-dimensional shape data having a perfect cross section represented by the design center axis and data of a radius of a tire to be manufactured. It is preferable that the approximate center axis and the design center axis coincide with each other to derive a shift amount between the three-dimensional measurement data and the three-dimensional design data having a perfect cross section.

The present invention is also an apparatus for inspecting the shape accuracy of a mold member for tire production, which is produced based on three-dimensional shape design data corresponding to the tread surface shape of a tire to be produced. It is produced by comparing the means for acquiring data, the means for measuring the three-dimensional shape of the mold member, the three-dimensional measurement data of the mold member acquired by measurement, and the three-dimensional design data of the mold member. Means for deriving a deviation amount of the shape of the mold member from the three-dimensional design data, and the mold member has a tread surface shape for one round of the tire in a plurality of portions along the tire circumferential direction. a plurality of partial molds, each with corresponding one of the divided partial shapes forming a tire mold by is disposed linked, or a master mold for making the part mold, the mold The means for measuring the three-dimensional shape of the material is the state in which the mold member is placed on the placement plane of the substrate having the placement plane, and at least the surface shape of at least a part of the placement plane, Measuring a three-dimensional shape of a tire surface which is a surface portion corresponding to the tread surface shape of the mold member and at least a part of a member back surface which is a surface of the mold member facing the tire surface; In the means for deriving, in the comparison, based on the three-dimensional measurement data of the mounting plane, the three-dimensional measurement data of the tire surface of the mold member, and the three-dimensional measurement data of the rear surface of the mold member , A measurement data reference point in the mold member three-dimensional measurement data is set, and the measurement data reference point is matched with a design data reference point in the three-dimensional design data corresponding to the measurement data reference point, The member three-dimensional measurement data and the three-dimensional design data are arranged in the same coordinate space, and in this arrangement state, a deviation amount between the three-dimensional measurement data and the three-dimensional design data of the mold member is derived. A tire type member inspection apparatus is also provided.

The present invention is also an apparatus for inspecting the shape accuracy of a mold member for tire production, which is produced based on three-dimensional shape design data corresponding to the tread surface shape of a tire to be produced. It is produced by comparing the means for acquiring data, the means for measuring the three-dimensional shape of the mold member, the three-dimensional measurement data of the mold member acquired by measurement, and the three-dimensional design data of the mold member. Means for deriving a deviation amount of the shape of the mold member from the three-dimensional design data, and the mold member has a tread surface shape for one round of the tire in a plurality of portions along the tire circumferential direction. A plurality of partial molds corresponding to one of the divided partial shapes and connected to each other to form a tire mold, or a master mold for producing the partial mold, The means for measuring the three-dimensional shape of the material is the state in which the mold member is placed on the placement plane of the substrate having the placement plane, and at least the surface shape of at least a part of the placement plane, The means for measuring the three-dimensional shape of the tire member, which is the surface portion corresponding to the shape of the tread surface of the mold member, and the means for deriving the three-dimensional measurement data of the mounting plane described above and the mold at the time of comparison Based on the three-dimensional measurement data of the tire surface of the member, at least one point on the design center axis corresponding to the center axis of the tire to be produced is derived, and the derived one point is measured in the mold member three-dimensional measurement data. A set measurement data reference point is set as a data reference point, and the measurement data reference point is matched with the design data reference point in the three-dimensional design data corresponding to the measurement data reference point. The mold member three-dimensional measurement data and the three-dimensional design data are arranged in the same coordinate space, and in this arrangement state, a deviation amount between the three-dimensional measurement data and the three-dimensional design data of the mold member is derived. In the comparison, a first plane corresponding to the mounting plane is set based on the three-dimensional measurement data of the mounting plane, and the first plane is set using the three-dimensional measurement data of the tire surface. A second plane passing through the tire surface parallel to the tire surface, and extracting a plurality of different combinations of two points from the intersection line of the surface represented by the three-dimensional measurement data of the tire surface and the second plane, Deriving all of the intersections of two different vertical bisectors among the vertical bisectors of the plurality of line segments connecting the two points of each combination, and based on the plurality of derived intersections, the design center Specifies the axial center point that approximates the point on the axis. The line perpendicular to the first plane passing through this axial center point is matched with the design center axis in the three-dimensional design data of the mold member corresponding to the center axis of the tire to be manufactured. There is also provided a tire mold member inspection apparatus characterized by deriving the deviation amount of a position other than the measurement data reference point of the dimension measurement data .

  According to the present invention, the shape of the mold member used for manufacturing the tire is measured in detail including the portion other than that corresponding to the surface shape of the tire, and the amount of deviation of the shape of the mold member from the design shape is accurately measured. Can be inspected. Thereby, the deviation | shift amount with respect to the design value of the mold member surface part corresponding to the tire surface in the state which has actually arrange | positioned the partial mold member in the vulcanizer, for example can be test | inspected correctly. In addition, it is possible to accurately inspect the deviation of the shape of the mold member before and after the transfer process at each transfer stage. Such inspection results can be used to improve the manufacturing accuracy in each manufacturing process and to improve the total manufacturing accuracy of the entire manufacturing process. This can be used for the production of tires.

  Hereinafter, a tire mold member inspection method, a tire mold member inspection apparatus, and a mold member manufacturing process accuracy inspection method of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

  First, a tire mold member inspection method and a tire mold member inspection apparatus of the present invention will be described (hereinafter referred to as a first aspect). In the first aspect, the three-dimensional shape of the mold member, which is produced based on the three-dimensional shape design data and used for producing the tire, is measured. By comparing with the three-dimensional design data, the production accuracy of the produced mold member, that is, the deviation amount of the mold member measurement data from the mold member design data is derived. In the present invention, the mold member corresponds to each partial shape obtained by dividing the tread surface shape for one round of the tire into a plurality of portions along the circumferential direction, each forming a tire mold by being connected and arranged. Each of the plurality of partial molds or various intermediate mold members used for producing these partial molds.

  A plurality of partial molds refers to each of a plurality of tread segment partial molds that are arranged in a vulcanizer during tire manufacture. In addition, various intermediate mold members are a master mold prepared by cutting a resin material according to mold member design data which is CAD or CAM data, which is used to produce such a tread segment partial mold. Master mold member set in a mold, a rubber mold in which the space shape of the inner surface of the master mold member is transferred, a rubber mold member in which this rubber mold is set in the mold, and a mold of the rubber mold member It includes both a gypsum mold in which the space shape of the inner surface is transferred, and a gypsum mold member in a state where the gypsum mold substrate is set in a mold frame. The production of various intermediate mold members and various intermediate mold members will be described in detail later in the description of the second aspect.

  FIG. 1 is a schematic configuration diagram illustrating a mold member three-dimensional shape measuring apparatus 10 (hereinafter simply referred to as an apparatus 10), which is an example of a tire mold member inspection apparatus according to the present invention. Hereinafter, the apparatus 10 is used to measure the three-dimensional shape of the partial mold 30, the three-dimensional measurement data (mold measurement data) of the partial mold 30 obtained by the measurement, and the three-dimensional design data (mold design) of the partial mold 30. Data) and an example of deriving the production accuracy of the produced partial mold 30 will be described.

  The apparatus 10 has a mounting table 12 for mounting the partial mold 30, and a three-dimensional shape of the shape of the partial mold 30 and the mounting table 12 mounted on the mounting table 12 (the shape of a mounting surface 15 described later). A three-dimensional scanner 18 for measurement, and a computer 20 connected to the mounting table 12 and the three-dimensional scanner 18 are configured. The computer 20 is connected to an input means 22 such as a keyboard and a mouse for receiving various input instructions from an operator, and a display 24 for displaying various calculation results by the computer 20.

  The mounting table 12 moves the stage 14 having a planar mounting surface 15 for mounting the partial mold 30 and the stage 14 provided on the side opposite to the mounting surface 15 of the stage 14. And stage moving means 16 for rotating. In the present embodiment, the stage moving unit 16 is configured to be able to rotate the stage 14 around a predetermined rotation axis (shown by a chain line in FIG. 1). The stage moving unit 16 is connected to an operation control unit 43 (to be described later) of the computer 20, and the operation (rotation of the stage 14) is controlled by a control signal output from the operation control unit 43.

  FIG. 2 is a schematic configuration diagram for explaining the computer 20. The computer 20 has a memory 40 and a CPU 41, and is a known computer in which the processing means 42 and the operation control unit 43 operate when the CPU 41 executes a program stored in the memory 40. The operation control unit 43 is connected to the three-dimensional scanner 18 and the stage moving unit 16, and transmits a control signal to each of the three-dimensional scanner 18 and the stage moving unit 16 to control each operation. The processing means 42 is a part that acquires the mold member measurement data measured by the three-dimensional scanner 18 and compares the mold member measurement data (mold measurement data) with the mold member design data (mold design data). The data acquisition unit 44, the reference point deriving unit 45, and the comparison unit 46 are included. In the memory 40, three-dimensional design data of the partial mold 30 is stored in advance.

  The data acquisition unit 44 is a part that acquires mold member measurement data measured by the three-dimensional scanner 18, three-dimensional measurement data (mounting surface measurement data) of the mounting surface 15 of the stage 14, and the like. The mold measurement data and the mounting surface measurement data acquired by the data acquisition unit 44 are sent to the reference point deriving unit 45. The reference point deriving unit 45 derives (sets) a measurement data reference point in the mold measurement data according to the mold measurement data and the placement surface measurement data. The mold measurement data and the measurement data reference point data are sent to the comparison unit 46.

  The comparison unit 46 reads out the mold design data stored in the memory 40, and mold measurement data in a state where the design data reference point of the mold design data corresponding to the measurement data reference point and the measurement data reference point coincide with each other. And the amount of deviation between the mold design data. The comparison result such as the shift amount derived by the comparison unit 46 is displayed and output on the display 24 (not shown in FIG. 2), for example. The mold design data is not limited to being stored in the memory 40 of the computer 20, but may be stored in various external storage media such as a magnetic recording medium and an optical recording medium.

  The three-dimensional scanner 18 is a device that obtains mold measurement data and placement surface measurement data by measuring the three-dimensional shape of the placement surface 15 of the partial mold 30 and the stage 14 located in the measurement space. The three-dimensional scanner 18 allows the entire partial mold 30 and at least a part of the mounting surface 15 to enter the measurement space in a state where the partial mold 30 is mounted on the mounting surface 15. The arrangement position and the arrangement angle are adjusted so that at least a part of the placement surface 15 is within the measurable range.

FIG. 3 is a diagram illustrating the configuration of the three-dimensional scanner 18. The three-dimensional shape scanner 18 includes a CPU 47, a driver circuit 48, a laser diode 49, a galvanometer mirror 50, optical systems 51 and 52, a CCD element 53, an AD converter 54, a FIFO 55, a signal processor 56, and a frame memory 57.
In the three-dimensional scanner 18, in response to a measurement start instruction from the computer 20, the CPU 47 generates a measurement start trigger signal and activates a clock generator (not shown) to generate a clock signal. This clock signal is supplied to the CCD element 53, AD converter 54, FIFO 55, and signal processor 56. On the other hand, by generating the trigger signal, the driver circuit 48 generates a laser light irradiation signal and supplies it to the laser diode 49. The laser diode 49 irradiates the laser beam by this, turns the laser beam into slit light, shakes the galvano mirror 50 that starts driving in accordance with the irradiation signal of the laser beam, and is irradiated through the optical system 51. A slit-shaped laser beam is scanned on the partial mold 30 and the mounting surface 15.

On the other hand, reflected light of the laser beam focused through the optical system 52 is received by the CCD element 53, the generated image signal is converted into a digital signal by the AD converter 54, and the image signal is sequentially processed through the FIFO 55. This is supplied to the processor 56. The signal processor 56 incorporates a circuit that executes a well-known algorithm using a light cutting method. From the supplied image signal, three-dimensional shape data (mold member measurement data) of the partial mold 30 and the mounting surface 15 is obtained. And mounting surface measurement data). This three-dimensional shape data is sequentially written in the frame memory 57 and is called up as necessary. A processing method for generating three-dimensional shape data from an image signal is an algorithm using a known light cutting method. The light cutting method is a method of irradiating a measuring object with slit light, photographing a band-like reflected light of the measuring object with a camera such as a CCD element, and obtaining three-dimensional shape data from an imaging position in the image. . The calculation at this time is performed based on the principle of triangulation.
The generated mold member measurement data and placement surface measurement data are supplied to the computer 20.
The three-dimensional scanner 18 is a device configured to perform the above operation.
An example of such a unit is a non-contact three-dimensional digitizer VIVID9i (manufactured by Konica Minolta Co., Ltd.) using a light cutting method.

  In the first embodiment, the manufacturing accuracy of the partial mold 30 is inspected using the apparatus 10 having such a configuration. 4A is a schematic top view showing a state in which the partial mold 30 is installed in a vulcanization container 31 of a tire vulcanizer together with other partial molds, and FIG. 4B is a partial mold. FIG. As shown in FIG.4 (b), the partial mold 30 divided | segmented the tread surface shape of the tire surrounding part which comprises a tire metal mold | die by connecting and arrange | positioning into several parts along the circumferential direction. It is one of a plurality of partial molds corresponding to each partial shape.

  The partial mold 30 has a tire surface 32 corresponding to the tread surface of the tire to be manufactured, and the shape of the tire surface 32 is transferred to the tread surface of the tire in the vulcanization molding process of the tire. The surface portion of the partial mold 30 other than the tire surface 30 affects the installation state when the partial mold 30 is installed in the vulcanizer. For this reason, in order to produce a highly accurate tire, the partial mold 30 has not only the tire surface 32 but also the shape accuracy of the member surface such as the shape of the mold back surface 34 on the side facing the tire surface 32. Very important. If the tire surface 32 and the mold back surface 34 are produced according to the mold design data, the tire surface 32 of the partial mold 30 (here, in the state where it is installed in the vulcanizer as shown in FIG. 4A) The cross section of the tire (excluding the tread groove portion) coincides with a perfect circle (a circle with the tire design radius as the radius) centered on the tire axis (point O in the drawing) of the tire to be manufactured.

  Naturally, when the tire surface 32 of the partial mold 30 is not produced according to the mold design data, the cross section of the tire surface 32 does not coincide with such a perfect circle. Even when the mold back surface 34 of the partial mold 30 is not produced according to the mold design data, the cross section of the tire surface 32 does not coincide with such a perfect circle. This is because if the shape accuracy of the mold back surface 34 is poor, the installation state at the time of installation in the vulcanizer is also deteriorated, and the installation position of the tire surface 32 is shifted in the state of being installed in the vulcanizer. In the present embodiment, the mold member such as the partial mold 30 was manufactured by measuring not only the three-dimensional shape of the tire surface corresponding to the shape of the tire but also the three-dimensional shape including the member surfaces other than the tire surface. The amount of deviation (error) from the design data of the shape of the entire mold member is inspected.

  FIGS. 5A and 5B are diagrams for explaining the mold design data (three-dimensional shape data) 60, and are schematic diagrams illustrating the three-dimensional shape data indicated by the mold design data 60. 5A corresponds to a schematic perspective view, and FIG. 5B corresponds to a schematic top view. The mold design data 60 has a tire surface portion 62 corresponding to the tread surface of the tire to be manufactured, and a plane corresponding to the mold back surface portion 64 on the side facing the tire surface portion 62 and the equator surface of the tire to be manufactured. Is provided with a mounting surface portion 66 (bottom surface) parallel to the surface. The mold back surface portion 64 includes a vertical surface portion 65 perpendicular to the mounting surface portion 66. As a matter of course, as shown in FIGS. 1 and 4, the partial mold 30 produced based on such mold design data 60 is also placed on the placement surface portion 66 of the mold design data. And a vertical surface 35 corresponding to the vertical surface portion 65 of the mold design data.

The mold design data is data reproducing an ideal shape, and the cross-sectional shape of the tire surface portion 64 (corresponding to FIG. 5B) is a part of a perfect circle centered on the virtual tire center axis O ′. It is. In FIG. 5B, a plane Y ′ that passes through a point C ′ that bisects the surface shape of the tire surface 62 along the tire circumferential direction, and that is perpendicular to the vertical surface portion 65, has a virtual tire center axis O ′. It is a plane that contains it. The vertical surface portion 65 corresponds to a surface serving as a reference when the mold member (mold member 30 in the present embodiment) produced based on the mold member design data is arranged in the vulcanizer. The midpoint S ′ of the intersection line l ′ between the plane Y ′ and the vertical surface portion 65 can be said to be a point (design data reference point) serving as a reference for the arrangement position in such a vulcanizer. Here, a plane X ′ parallel to the plane X ₁ ′ including the mounting surface portion 66 and passing through the midpoint S ′ (a plane corresponding to the equator plane of the tire to be manufactured) and a vertical surface portion 65 are included. Let the plane be Z ′. The mold member design data has the midpoint S ′ as the origin, and intersects the plane Z ′ and the plane X ′, the plane X ′ and the plane Y ′, and the plane Y ′ and the plane Z ′ intersect. It is represented by coordinates on a coordinate system with three axes (x axis, y axis, z axis). Note that the mold design data does not need to be represented by coordinates on such a coordinate system from the design stage. For example, after being stored in the memory 40, the processing unit 42 may convert the coordinate system of the mold design data.

  Hereinafter, the shape accuracy inspection method of the partial mold 30 corresponding to the tire mold member inspection method of the present invention will be described. FIG. 6 is a flowchart of the shape accuracy inspection method for the partial mold 30 according to the present embodiment.

  First, a measurement target mold member (partial mold 30), which is a shape accuracy comparison target, is placed on the placement surface 15 of the stage 14 (step S102). When the partial mold 30 is placed on the stage, the measurement target space of the three-dimensional scanner 18 includes at least a part of the partial mold 30 and the placement surface 15 regardless of how the stage 14 is rotated. Place it in such a position. As described above, the partial mold 30 includes the mounting surface 36 parallel to a plane corresponding to the equator plane of the tire to be manufactured, and the mounting surface 36 and the mounting surface 15 of the stage 14 come into contact with each other. Thus, the partial mold 30 is placed on the placement surface 15. As described above, the mold back surface 34 of the partial mold 30 has the vertical plane 35 that is a plane perpendicular to the mounting surface 36.

  In this state, the measurement of the three-dimensional shape is started for at least a part of the partial mold 30 and the mounting surface 15 (step S104). When measuring the three-dimensional shape, the control signal is transmitted from the operation control unit 43 of the computer 20 to the stage moving means 16 while the position of the three-dimensional scanner 18 and the angle of the light receiving surface are fixed, and the stage 14 is set at a predetermined angle. When the rotation is completed and the position is fixed, a control signal is transmitted from the operation control unit 43 to the scanner 18 and the scanner 18 measures the three-dimensional shape. Each time the three-dimensional shape is measured, the measured three-dimensional shape data is stored in the memory 40. When the stage 14 rotates 360 ° or more and the three-dimensional shape data of the entire partial mold 30 is stored in the memory 40, the data synthesizing means (not shown) of the computer 20 is acquired from a plurality of angles stored in the memory 40. The dimensional shape data is synthesized to create mold measurement data and placement surface measurement data for the entire measurement range of the mold 30 and the placement surface 15.

  In the measurement of such a three-dimensional shape, the three-dimensional shape may be measured using a mirror. In particular, the tire surface 32 of the partial mold 30 has a shape corresponding to the tread portion of the tire, and has fine irregularities corresponding to vertical grooves and horizontal grooves to be provided on the tread surface of the tire. Due to such fine irregularities, there may be a region where the laser light emitted from the three-dimensional scanner 18 cannot reach no matter how the stage 14 is rotated. When measuring such a region, it can be measured by placing a mirror at a desired position on the mounting surface 15 of the stage 14. FIG. 7 is a schematic configuration diagram for explaining a method of measuring the three-dimensional shape of a mold member using such a mirror.

In this case, as shown in FIG. 7, the placement surface 15 of the stage 14 is irradiated so that the laser beam reflected by the mirror 17 is irradiated to a region (shadow region) that cannot be reached no matter how the stage 14 is rotated. A mirror 17 is placed. As a result, the shadow area is irradiated with the laser beam via the mirror 17, and the reflected light from the shadow area of the laser beam is received by the three-dimensional scanner 18. In the three-dimensional scanner 18, information on the distance from the laser beam emitted from the three-dimensional scanner 18 to the measurement point is obtained. In other words, the three-dimensional scanner 18 measures the shape of the mirror image reflected on the mirror 17. The information thus obtained is determined according to the arrangement position N ₁ of the three-dimensional scanner, the arrangement position N _{2 of} the mirror 17, and the arrangement angle of the reflection surface 13 of the mirror 17 (perpendicular to the placement surface 15 in the figure). The reflection angle α can be used to convert the position information into actual space. When placing the mirror 17 on the placement surface 15, it is necessary to acquire such information. In addition, it is preferable that the apparatus 10 has mirror surface arrangement means (not shown) that can arrange the mirror 17 at a desired position on the placement surface 15 according to control information from the computer 20. .

Next, the measurement data reference point S ₁ corresponding to the design data reference point S ′ in the mold measurement data is derived using the mold measurement data 70 and the mounting surface measurement data 77 acquired in this way (step S _1). S106). The FIGS. 8 (a) and 8 (b), a diagram illustrating an example of derivation of the measured data reference point S ₁ in the mold measured data, FIGS. 8 (a) in the schematic perspective view, FIG. 8 (b) Each corresponds to a schematic top view. The mounting surface measurement data 77 is three-dimensional shape data that reproduces the planar shape of the mounting surface 15. The mold measurement data 70 is three-dimensional shape data that reproduces the shape of the partial mold member 30, and corresponds to the tire surface portion 72 corresponding to the tire surface 32, the mold back surface portion 74 corresponding to the mold back surface 34, and the vertical surface portion 35. A vertical surface portion 75 is provided. The measurement data reference point S ₁ corresponding to the design data reference point S ′ is derived as follows.

First, based on the placement surface measurement data 77, sets the plane X ₁ representing the planar shape of the mounting surface 15. If data placement surface measurement data 77 represents completely plane may be the plane as X _1. If the placement surface measurement data 77 is not the data representing the complete plane, the surface shape mounting surface measurement data 77 represents the smoothed shape may be a plane X _1. Next, a plane (not shown) parallel to the plane X ₁ is set, and an intersection line L between the plane and the tire surface portion 72 corresponding to the tire surface 32 is defined. When setting a plane parallel to the plane X _1, the intersection line L is, among the tire surface portion 72, it is preferable to set to be a region corresponding to a tread surface of the tire rather than the regions corresponding to the tire groove portion . Next, define a straight line L ₁ passing through both ends of the line of intersection L. Then, it intersects with the intersection line L, to set the straight line _{L 1} and a plurality of parallel straight lines _{L 2,} shown in combination (FIG. 8 (b) of intersection between the straight line _{L 2} and the intersection line L, _{A 1} and A ₂ , B ₁ and B ₂ , C ₁ and C ₂ . Then, midpoints ma, mb, mc... On line segments connecting the combinations of intersections are obtained.

The partial mold 30 is created on the basis of the mold data 60. If the shape is the same as the mold design data 60, the midpoints ma, mb, mc,. It should be a point on the line. That is, the midpoints ma, mb, mc,... Are points on the plane corresponding to the plane Y ′ shown in FIG. 5 and the intersection of the plane corresponding to the plane Y ′ and the plane including the intersection line L. Should be a point on the line. However, in the actual partial mold 30, the midpoints ma, mb, mc,... Are not on the same straight line due to manufacturing errors. In this embodiment, in order to define the plane Y corresponding to the plane Y ′ in the mold measurement data, an approximate straight line N of the midpoints ma, mb, mc... Is derived using, for example, the least square method. A plane including the approximate straight line N and perpendicular to the plane X is defined as a plane Y corresponding to the plane Y ′. Then, an intersection line l between the plane Y and the vertical surface portion 75 that is the back surface of the member is obtained. The intersection line l becomes a point on the vertical surface portion 75, the midpoint of the intersection line l, i.e. a half of the position in the height direction perpendicular to the X plane, as a reference point S ₁ on the mold measured data Stipulate. Here, parallel to the plane X _1, a plane passing through the reference point S ₁ as the plane X, passes through the reference point S _1, a planar Z a plane perpendicular to both the plane Y and the plane X. Then, the reference point S ₁ as the origin, the intersection line of the plane Z and the plane X, plane X and the plane Y intersection line, three axes (x axis orthogonal line of intersection of the plane Y and the plane Z, the, y-axis, The coordinates of each measurement point of the mold measurement data are expressed by coordinates on the coordinate system (z axis).

Then, the mold design data represented by the above coordinate system is read (step S110), and the mold measurement data represented by the coordinates of such a coordinate system and the mold design data represented by the above coordinate system are obtained. In comparison, a coordinate shift at each measurement point is derived (step S112). Thus, by expressing the mold design data and the mold measurement data by the coordinates in each of the above coordinate systems, the design data reference point (middle point S ′) in the mold design data and the design data reference in the mold measurement data. A deviation amount of the mold measurement data with respect to the mold design data when the point S ′ is matched with the corresponding measurement data reference point S ₁ is derived. The reference point S defines the installation position when the partial mold is actually installed in the vulcanizer, and the deviation amount derived in this way is the actual location of the partial mold 30 installed in the vulcanizer. It can be said that it represents the amount of deviation.

  Next, the comparison result is output (step S114). As a comparison result, for each measurement point of the mold measurement data, an absolute value of the deviation amount with respect to the design data may be output for each measurement point. Also, for each measurement point, the absolute value of the deviation amount with respect to the design data is compared with a predetermined design tolerance value, and the design is performed only for the measurement point where the absolute value of the deviation amount is larger than this design tolerance value. A message indicating that the deviation amount is larger than the tolerance value may be displayed. In addition, for example, a three-dimensional model corresponding to mold measurement data is displayed on the display, and a measurement point having a deviation larger than a predetermined design tolerance value is expressed in a color different from other measurement points, and the display is displayed. You may visually show the part where the amount of deviation is larger than the design tolerance value to the observer who sees. In addition, using marking means (not shown), marking may be performed on a portion of the actual partial mold 30 corresponding to a measurement point having a larger deviation amount than a predetermined design tolerance value.

  In the above embodiment, paying attention to the amount of deviation when the partial mold 30 is actually installed in the vulcanizer, in step S106 to step S112, mold measurement corresponding to the reference point S ′ in the mold design data. The reference point S in the data was derived, and the reference point S ′ and the reference point S were made to coincide with each other, thereby deriving the deviation amount of each measurement point in the mold measurement data. In the present invention, for example, when it is particularly desired to know the deviation amount from the roundness of the tire surface 32 in the partial mold 30, the deviation amount from the perfect circle of the mold measurement data may be derived as follows. .

FIG. 9 is a diagram for explaining derivation of another example of the measurement data reference point in the mold measurement data, and corresponds to a schematic top view. First, as in the case described above, a plane parallel to the plane X is set, and an intersection line L between the plane and the tire surface portion 72 corresponding to the tire surface 32 is defined (see FIG. 8A). When setting a plane parallel to the plane X, it is preferable to set the intersecting line L so that it is not a region corresponding to the tire groove portion of the tire surface portion 72 but a region corresponding to the tire tread surface. Then, a plurality of combinations of two different points (D ₁ and D ₂ , E ₁ and E ₂ , F ₁ and F ₂ ,...) Are extracted from the intersection line L, and a plurality of the two points of each combination are connected. A plurality of intersections U ₁ , U 2, U 3,... Where two different vertical bisectors intersect are derived for each of the vertical bisectors T ₁ , T ₂ , T ₃ . The plurality of intersections _U 1, U2, U3 position of the center of gravity of ... is set as a reference point _{S 2.} When the tire surface 62 of the partial mold member 30 is produced faithfully to the mold member design data, the plurality of intersection points U ₁ , U 2, U 3 are all the same point, that is, the point corresponding to the tire axis of the tire to be produced. Should meet. In the present embodiment, such a reference point S _2, assuming that a point corresponding to the center axis of the tire to be produced, around the reference point S _2, the circularity of the radius of the tire and a radius to be produced The deviation amount of each measurement data with respect to is derived. Such an embodiment may be suitably used in the case where it is desired to inspect only the production accuracy of the shape of the tire surface 32 among the shapes of the partial mold 30.

  Also in this case, as a comparison result, for each measurement point of the mold measurement data, the absolute value of the deviation amount with respect to the perfect circle represented by the design data may be output for each measurement point. Also, for each measurement point, the absolute value of the deviation amount with respect to the perfect circle represented by the design data is compared with a predetermined design tolerance value, and the absolute value of the deviation amount is larger than this design tolerance value. Only for the points, it may be displayed and output that the deviation amount is larger than the design tolerance value. In addition, for example, a three-dimensional model corresponding to mold member measurement data is displayed on a display, and a measurement point having a deviation larger than a predetermined design tolerance value is expressed in a color different from other measurement points. The viewer may visually show a portion where the amount of deviation is larger than the design tolerance value. In addition, using marking means (not shown), marking may be performed on a portion of the actual partial mold 30 corresponding to a measurement point having a larger deviation amount than a predetermined design tolerance value.

  Next, a second embodiment of the present invention will be described. In the second embodiment of the present invention, a master mold is produced according to the three-dimensional design data of the shape of the tread surface of the tire to be produced, and the shape of the produced master mold is sequentially transferred, and a material that is different for each transfer. By manufacturing the intermediate member, the shape transfer accuracy between a plurality of different transfer processes when a tire mold is manufactured is inspected. In the second embodiment of the present invention, among the plurality of transfer processes, at least the three-dimensional shape of the intermediate mold member just before the transfer process whose shape transfer accuracy is to be inspected, and the intermediate mold member after the transfer process whose shape transfer accuracy is to be inspected Each of the three-dimensional shapes is measured. Then, the shape transfer is performed by comparing the three-dimensional shape measurement data of the intermediate mold member before transfer immediately before the transfer process with the three-dimensional shape measurement data of the intermediate mold member after transfer after one or more transfer processes. Derivation of shape transfer accuracy before and after the transfer process for which accuracy is to be inspected.

  FIG. 10 is a flowchart for explaining a mold manufacturing process in which a mold for tire manufacturing is manufactured by sequentially transferring the shape of the manufactured master mold and manufacturing an intermediate mold member of a different material for each transfer. FIG. FIGS. 11A to 11D are schematic perspective views of various molds among various intermediate mold members produced in the mold production process shown in FIG.

  When producing a mold, first, mold member design data, which is CAD or CAM data, is created based on the tread surface shape of a tire to be produced (step S202). Then, the resin material is cut according to the mold member design data, which is CAD or CAM data, to produce a master mold 82 as shown in FIG. 11A (step S204). And this master type | mold 82 is set to the formwork enclosed by the wall surface arrange | positioned so that the circumference | surroundings of the master type | mold 82 may be enclosed, and the master type | mold member of the state by which the master type | mold 82 was set to the formwork is comprised. (Step S206). Then, a rubber member is poured into the space on the inner surface of the mold of the master mold member (the space surrounded by the surface of the master mold 82 and the inner surface of the wall surface), and the space shape of the inner surface of the mold of the master mold member is transferred. Further, a rubber mold 84 as shown in FIG. 11B is produced (step S208). As will be described in detail later, the rubber mold 84 is provided by transferring a space shape surrounded by the surface of the master mold 82 and the inner surface of the wall surface to the surface of the metal lid 83. Next, the rubber mold 84 is set in a mold frame surrounded by wall surfaces arranged so as to surround the rubber mold 84, thereby constituting a rubber mold member in a state where the rubber mold 84 is set in the mold frame. (Step S210). Then, an uncured gypsum member is poured into the space on the inner surface of the mold of the rubber mold member (the space surrounded by the surface of the rubber mold 84 and the inner surface of the wall surface), and the space on the inner surface of the mold of the rubber mold member A gypsum mold 86 as shown in FIG. 11C to which the shape has been transferred is produced (step S212). Then, the gypsum mold 86 is dried and sufficiently cured (step S214), and the gypsum mold 86 is set on the mold to constitute a gypsum mold member in a state where the gypsum mold 86 is set on the mold ( Step S216). The metal member was poured into the space on the inner surface of the mold frame of this gypsum mold member (the space surrounded by the surface of the gypsum mold 86 and the inner surface of the wall surface), and the space shape of the inner surface of the mold frame of this gypsum mold member was transferred. A mold 88 as shown in FIG. 11D is produced (step S218).

  In the second embodiment, for each of these various intermediate mold members (each mold and each mold member), at least the three-dimensional shape of the intermediate mold member after the transfer process whose shape transfer accuracy is to be inspected is measured. Then, by comparing the three-dimensional shape measurement data of the pre-transfer intermediate mold member before the transfer process with the three-dimensional shape measurement data of the post-transfer intermediate mold member after the transfer process, before and after the transfer process to inspect the shape transfer accuracy Deriving the shape transfer accuracy at.

  Thereafter, as an example, a rubber member is poured into the space on the inner surface of the mold of the master mold member (the space surrounded by the surface of the master mold 82 and the inner surface of the wall surface) in step S208, and the inner surface of the mold of the master mold member An example of deriving the transfer accuracy in the process of producing the rubber mold 84 to which the space shape is transferred will be described. That is, a description will be given of a comparison between the intermediate mold members produced in steps S206 and S208 indicated by an arrow II in FIG.

  FIG. 12 is a diagram illustrating a state immediately after the process of step S206. FIG. 12A shows that the master mold 82 is set in a mold 94 surrounded by a wall 92 arranged so as to surround the master mold 82, and the master mold 82 is set in the mold 94. 3 is a schematic perspective top view of a mold member 90. FIG. FIG. 12B shows a state in which one of the four wall surfaces 92 of the mold 94 is removed (the lower wall surface in FIG. 12A), and the inside of the master mold member 90 is removed from the removed side. It is a schematic side view which shows the state which observed space. In FIG. 12C, the lid 83 is disposed on the open surface on the upper surface side of the master mold member 90, and one of the four wall surfaces 92 of the mold 94 is removed. It is a schematic side view which shows the state which observed the internal space of the master type | mold member 90 from the side. The lid 83 is provided with a rubber member inflow hole (not shown) penetrating the lid 83, and from this rubber member inflow hole, an uncured portion is provided in the internal space 95 of the master mold member 90 shown in FIG. The rubber member is poured. In step S208, an uncured rubber member is poured into the internal space 95 of the master mold member 90 from the rubber member inflow hole, so that the surface of the master mold 82 and the inner surface of the wall surface 92 are placed on the surface of the metal lid 83. A rubber mold 84 to which the space shape surrounded by is transferred is produced.

  In the production of such a rubber mold 84, the hardness of the rubber after curing is lower than the hardness of the master mold 82 and the wall surface 92. Therefore, when the rubber is cured in a state of being distorted inside, the rubber mold substrate In a state where 84 is removed from the master mold member 90 (completed state of the rubber mold), the surface shape of the rubber mold 84 may be distorted. Such distortion leads to a shape error of the actually produced tire shape. In the production of the rubber mold 84, when an uncured rubber member is poured into the internal space 95 of the master mold member 90, an air pocket is generated on the surface portion of the master mold 82 in the internal space 95 of the master mold member 90. In some cases, the rubber is cured while the air pocket remains. Such an air pocket naturally results in the shape of the rubber mold 84. Accurately grasping the degree of such distortion and defects that occur in the rubber mold manufacturing process, that is, in the process of step S208, improves the shape transfer accuracy of the rubber mold manufacturing process itself (step S208). It is very important in making it happen. In the second embodiment of the present application, in order to accurately grasp the transfer accuracy in each of these processes, at least the three-dimensional shape of the intermediate mold member after the transfer process whose shape transfer accuracy is desired to be inspected is measured. The three-dimensional shape measurement data of the previous pre-transfer intermediate mold member is compared with the three-dimensional shape measurement data of the post-transfer intermediate mold member after the transfer process.

  In order to obtain the shape transfer accuracy in the rubber mold substrate manufacturing process in step S208, the surface shape of the rubber mold 84, particularly the rubber, may be compared with the surface shape of the internal space 95 of the master mold member 90. For this purpose, first, the surface shape of the internal space 95 of the master mold member 90 is measured. For such shape measurement and evaluation, the three-dimensional scanner 18 and the computer 20 used in the first embodiment may be used.

  In order to measure the surface shape of the internal space 95 of the master mold member 90, first, in a state where the lid body 83 is not disposed on the frame body 94, the master mold member is viewed from the upper surface side where the lid body 83 is to be disposed. The shape of 90 internal spaces is measured. That is, the three-dimensional shape of the internal space of the master mold member 90 is measured at a measurement angle at which the three-dimensional shape in the measurement range as shown in FIG. The shape of the internal space of the master mold member 90 is measured from the side of the removed side surface in a state where one of the four wall surfaces 92 of the mold 94 is removed. That is, the three-dimensional shape of the internal space of the master mold member 90 is measured at a measurement angle at which the three-dimensional shape in the measurement range as shown in FIG. The measurement from the side surface side is preferably performed from each side of the wall surface 92 surrounding the four sides of the master-type substrate 82. By combining the three-dimensional measurement data obtained by these measurements, detailed three-dimensional shape measurement data of the internal space of the master mold member 90 can be obtained. Such detailed measurement data of the three-dimensional shape of the internal space of the master mold member 90 is stored in the memory 40 of the computer 20, for example.

  And after the process of step S208 is performed, the three-dimensional shape of the produced rubber mold 84 is measured. At this time, for example, after measuring the three-dimensional shape at a measurement angle at which the three-dimensional shape in the measurement range as shown in FIG. 11B is measured, the three-dimensional shape is measured from each of the four side surfaces substantially perpendicular to the upper surface. The three-dimensional shape measurement data of the rubber mold 84 may be obtained by measuring the shape and synthesizing the obtained three-dimensional shape data. The detailed measurement data of the three-dimensional shape of the internal space of the rubber mold member 84 is stored in the memory 40 of the computer 20, for example.

  Then, for example, the reference point deriving unit 45 of the computer 20 reads out the three-dimensional shape measurement data of the internal space of the master mold member 90 and the three-dimensional shape measurement data of the rubber mold member 84, respectively. A reference point is derived from each. At this time, as a reference point, it is preferable to use a portion of the three-dimensional shape that does not correspond to the tire shape as the reference point. This is because the shape of the portion corresponding to the shape of the tire is relatively monotonous (except for the detailed tire groove portion), it is difficult to derive the reference point, and the tire groove portion having a complicated shape This is because it is the target portion itself for which the transfer accuracy is to be evaluated in the most detail, and it is not preferable to compare such a portion as a reference point.

  In this example, the reference point is a point (see FIGS. 11 and 12) corresponding to the corner 91 in the boundary portion between the tire shape portion and the surrounding portion in the master die 82. Such a reference point can be easily measured, and the shape is also characteristic, so that it can be easily extracted from the three-dimensional shape measurement data.

  Then, for example, in the comparison unit 46 of the computer 20, the three three-dimensional shape measurement data of the internal space of the master mold member 90 and the three-dimensional shape measurement data of the rubber mold member 84 are matched with each other. A deviation amount of each measurement of the dimensional shape measurement data is derived. It can be said that the amount of deviation derived in this way well represents the shape transfer accuracy of the rubber mold manufacturing process itself in step S208.

  Then, for example, such a comparison result is displayed on the display 24 connected to the computer 20 or the like. As a comparison result, for each measurement point of the rubber mold 84, an absolute value of a deviation amount with respect to the three-dimensional shape measurement data of the internal space of the master mold member 90 may be output for each measurement point. Further, for each measurement point, the absolute value of the deviation amount with respect to the three-dimensional shape measurement data of the internal space of the master mold member 90 is compared with a predetermined design tolerance value, and the deviation amount is compared with this design tolerance value. Only a measurement point having a large absolute value may be displayed and output indicating that the deviation amount is larger than the design tolerance value. Further, for example, a three-dimensional model corresponding to the three-dimensional shape measurement data of the rubber mold 84 is displayed on the display, and a measurement point whose deviation amount is larger than a predetermined design tolerance value is different in color from other measurement points. It is also possible to visually represent a portion where the amount of deviation is larger than the design tolerance value for the observer who views the display. Further, by using marking means (not shown), only a portion of the actual rubber mold 84 corresponding to a measurement point having a larger deviation amount than a predetermined design tolerance value may be marked.

  In the above-described embodiment, an example of deriving the transfer accuracy in the process of producing the rubber mold 84 in step S208, that is, the intermediate mold member produced in each process of step S206 and step S208 indicated by an arrow II in FIG. Each comparison was explained. In the second embodiment of the present application, the process of deriving the transfer accuracy is not limited to such a process. For example, by comparing the surface shape of the master mold 82 and the surface shape of the rubber mold 84, the shape transfer accuracy when the two processes of Step S206 to Step S208 in FIG. Arrow I) in FIG. This is effective when, for example, it is desired to evaluate the transfer accuracy in consideration of the installation position shift of the mold 94 with respect to the master mold 82 when the master mold 82 is set on the mold 94. Similarly, by comparing the surface shapes of the rubber mold 84 and the plaster mold 86, the shape transfer accuracy when the two processes of Step S210 to Step S212 of FIG. 10 are performed may be derived (FIG. Arrow III in 10). Further, in the case of deriving the transfer accuracy in the process of manufacturing the gypsum mold substrate 86 in step S212, the intermediate mold members manufactured in each process of step S210 and step S212 indicated by arrow IV in FIG. 10 are compared. That's fine. Similarly, by comparing the surface shapes of the plaster mold 86 and the mold 88, the shape transfer accuracy when the steps S212 to S218 in FIG. 10 are performed may be derived (in FIG. 10). Arrow V). Further, in the case of deriving the transfer accuracy in the step of producing the mold 88 by casting in step S218, the intermediate mold members produced in the steps S216 and S218 shown by the arrow VI in FIG. 10 are compared. do it. In the second embodiment of the present application, each process for inspecting the transfer accuracy is not limited to the process indicated by an arrow on the right side of the flowchart in FIG. 10. For example, a master mold and a plaster mold are used. It is also possible to compare the rubber mold and the mold. Needless to say, the arrow on the left side of the flowchart of FIG. 10 shows an example of a combination of three-dimensional shape data to be compared in the first embodiment of the present invention.

  As described above, the gypsum mold 86 is subjected to a drying process for a long time prior to the setting of the form shown in step S216. In the second embodiment of the present application, the three-dimensional shape of the gypsum mold 86 is measured at each stage in the drying process in step S216, and the degree of change with time in the drying process (in other words, the shape maintenance accuracy) is derived. Good. Since the three-dimensional scanner 18 can measure the three-dimensional shape in a short time, the change with time of the gypsum-type substrate 86 in the drying process in step S216 can be derived in detail in fine time units. In each of the above cases, if the reference point is a point (see FIGS. 10 and 11) corresponding to the corner 91 in the boundary portion between the tire shape portion and the surrounding portion in the master die 82, as the reference point. Good.

  As described above, the tire mold member inspection method, the tire mold member inspection apparatus, and the mold member manufacturing process accuracy inspection method of the present invention have been described in detail. However, the present invention is not limited to the above embodiment and does not depart from the gist of the present invention. Of course, various improvements and changes may be made in the range.

It is a schematic block diagram explaining an example of the tire type | mold member test | inspection apparatus of this invention. It is a schematic block diagram explaining the computer in the tire type | mold member test | inspection apparatus shown in FIG. It is a schematic block diagram explaining the three-dimensional scanner in the tire type | mold member test | inspection apparatus shown in FIG. (A) is a schematic top view showing a state where a partial mold, which is a target mold member for measuring a three-dimensional shape by the tire mold member inspection apparatus shown in FIG. 1, is installed in a tire vulcanizer together with other partial molds. It is a figure and (b) is a schematic top view explaining a partial mold. (A) And (b) is the schematic which shows the three-dimensional shape data which mold member design data shows, (a) is equivalent to a schematic perspective view, (b) is a figure corresponding to a schematic top view. . It is a flowchart figure of an example of the tire type | mold member inspection method of this invention. It is a schematic block diagram explaining the method to measure the three-dimensional shape of a type | mold member using a mirror. It is a figure explaining derivation | leading-out of an example of the measurement data reference point in mold measurement data, FIG.8 (a) is a figure corresponding to the schematic perspective view of the three-dimensional shape which mold measurement data shows, FIG.8 (b) is FIG. It is a figure corresponding to the schematic top view of the three-dimensional shape which mold measurement data shows. It is a figure explaining derivation | leading-out of the other example of the measurement data reference point in mold measurement data, and is a figure corresponding to the schematic top view of the three-dimensional shape which mold measurement data shows. It is a flowchart figure explaining an example of the production process of a mold which transfers the shape of various mold members sequentially, and produces the mold metal mold for tire preparation. It is a schematic perspective view of various type | mold board | substrates among the various intermediate mold members produced in the production process of the mold die shown in FIG. (A)-(c) is a figure explaining the master type | mold member of the state by which the master type | mold was set to the formwork, (a) is a schematic top view of a master type | mold member, (b) is a master type | mold. The schematic side view of the master mold member in a state in which a part of the wall surface surrounding the member is removed, (c) shows a schematic side view in a state where a lid is disposed on the open surface on the upper surface side of the master mold member. ing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 3D shape measuring apparatus 12 Mounting stand 14 Stage 15 Mounting surface 16 Stage moving means 18 3D scanner 20 Computer 22 Input means 24 Display 30 Partial molding member 31 Vulcanization container 32 Tire surface 35 Vertical surface 36 Mounting surface 40 Memory 41 CPU
42 processing means 43 operation control unit 44 data acquisition unit 45 reference point derivation unit 46 comparison unit 47 CPU
48 Driver circuit 49 Laser diode 50 Galvano mirror 51,52 Optical system 53 CCD element 54 AD converter 55 FIFO
56 signal processor 57 frame memory 60 mold design data 62 tire surface portion 64 mold back surface portion 65 vertical surface portion 66 mounting surface portion 70 mold measurement data 72 tire surface portion 74 mold back surface portion 75 vertical surface portion 77 mounting surface measurement Data 82 Master mold 83 Cover body 84 Rubber mold 86 Plaster mold 88 Mold 90 Master mold member 92 Wall surface 94 Mold frame 95 Internal space

Claims (13)

A method for inspecting the shape accuracy of a mold member for tire production, which is produced based on the three-dimensional shape design data corresponding to the tread surface shape of a tire to be produced,
Obtaining the three-dimensional shape design data;
Measure the three-dimensional shape of the mold member,
By comparing the three-dimensional measurement data of the mold member acquired by measurement and the three-dimensional design data of the mold member, a deviation amount of the shape of the produced mold member from the three-dimensional design data is derived. Is,
The mold member corresponds to one of the partial shapes obtained by dividing the tread surface shape for one round of the tire into a plurality of portions along the tire circumferential direction, and a plurality of the mold members are connected to each other to form a tire mold. Or a master mold for producing the partial mold ,
When measuring the three-dimensional shape of the mold member, in a state where the mold member is mounted on the mounting plane of the substrate having a mounting plane, at least a surface shape of at least a part of the mounting plane; A three-dimensional shape of a tire surface which is a surface portion corresponding to the tread surface shape of the mold member and at least a part of a member back surface which is a surface of the mold member facing the tire surface is measured. ,
At the time of comparison, based on the three-dimensional measurement data of the mounting plane, the three-dimensional measurement data of the tire surface of the mold member, and the three-dimensional measurement data of the rear surface of the mold member, the mold member three-dimensional measurement data Set the measurement data reference point at
By matching the measurement data reference point with the design data reference point in the three-dimensional design data corresponding to the measurement data reference point, the mold member three-dimensional measurement data and the three-dimensional design data are placed in the same coordinate space. And in this arrangement state, a deviation amount between the three-dimensional measurement data and the three-dimensional design data of the mold member is derived. The part of the rear surface of the member includes at least an arrangement reference point serving as a reference for an arrangement position of the partial mold when the partial mold is arranged in a vulcanizer for manufacturing a tire.
During the comparison, the type wherein the member 3 dimensional measurement data extracting a point corresponding to the arrangement reference point, tire type according to claim 1, wherein setting the point that the extracted as the measurement data reference point Member inspection method. The mold member includes a mounting surface parallel to a plane passing through the tire surface corresponding to the equator plane of the tire to be manufactured,
When measuring the three-dimensional shape of the mold member, the mounting surface is in contact with the mounting surface of the substrate, and the mold member is placed on the mounting plane, at least, Measuring the three-dimensional shape of the surface shape of a part of the mounting plane, the tire surface of the mold member, and the part of the back surface of the member;
The measurement data reference point is set using the three-dimensional measurement data of the measured surface shape of a part of the mounting plane, the tire surface of the mold member, and the part of the member back surface. The tire mold member inspection method according to claim 2 , wherein the tire mold member is inspected. The member back surface of the mold member includes at least a vertical surface portion substantially perpendicular to the mounting surface,
When measuring the three-dimensional shape of the mold member, the mounting surface and the mounting surface are brought into contact with each other, the mold member is mounted on the mounting plane, and the vertical surface portion is mounted on the mounting surface. In a state perpendicular to the surface,
The tire mold member according to claim 3 , wherein at least a three-dimensional shape of the surface shape of a part of the mounting plane, the tire surface of the mold member, and the vertical surface portion is measured. Inspection method. In the comparison, based on the three-dimensional measurement data of the mounting plane, a first plane corresponding to the mounting plane is set, and the first plane is determined using the three-dimensional measurement data of the tire surface. Set a second plane through the parallel tire surfaces;
The intersection of the surface represented by the three-dimensional measurement data of the tire surface and the second plane, and each of a plurality of different straight lines parallel to a straight line connecting both ends of the intersection, Extract multiple combinations,
Deriving the midpoint of each of multiple line segments connecting two intersections in each combination,
Based on the derived midpoints, an approximate straight line that approximates the midpoint as a point on the same straight line is derived,
Setting a third plane perpendicular to the first plane including the approximate straight line, and deriving a line of intersection between the set third plane and the back of the member;
The tire mold member inspection method according to claim 4 , wherein a midpoint of the intersection line is set as the reference point. The three-dimensional shape measurement data of the mold member is acquired using a three-dimensional scanner,
The three-dimensional scanner obtains three-dimensional measurement data of the mold member by irradiating the mold member with projection light and detecting reflected light from the surface of the mold member of the projection light,
When irradiating at least a part of the surface of the mold member with light, the mold member is irradiated with the projection light through a mirror, and the reflected light from the surface of the mold member is reflected on the mirror. The tire mold member inspection method according to claim 2 , wherein the tire mold member inspection method is performed. And a display output step for displaying on the display screen at least one of the shape represented by the three-dimensional shape measurement data measurement data and the shape represented by the three-dimensional shape design data,
Wherein the display output step, the deviation amount is, for the measurement points is determined to be greater than the predetermined design tolerance value, claims 2 to which and displaying in a different display form and the other measurement points The tire mold member inspection method according to any one of claims 6 to 10. The tire mold member inspection method according to claim 7 , further comprising a step of marking a position corresponding to a measurement point at which the deviation amount is determined to be larger than the design tolerance value. A method for inspecting the shape accuracy of a mold member for tire production, which is produced based on the three-dimensional shape design data corresponding to the tread surface shape of a tire to be produced,
Obtaining the three-dimensional shape design data;
Measure the three-dimensional shape of the mold member,
By comparing the three-dimensional measurement data of the mold member acquired by measurement and the three-dimensional design data of the mold member, a deviation amount of the shape of the produced mold member from the three-dimensional design data is derived. Is,
The mold member corresponds to one of the partial shapes obtained by dividing the tread surface shape for one round of the tire into a plurality of portions along the tire circumferential direction, and a plurality of the mold members are connected to each other to form a tire mold. Or a master mold for producing the partial mold,
When measuring the three-dimensional shape of the mold member, in a state where the mold member is mounted on the mounting plane of the substrate having a mounting plane, at least a surface shape of at least a part of the mounting plane; Measure the three-dimensional shape of the mold member and the tire surface, which is the surface portion corresponding to the tread surface shape,
At the time of comparison, at least one point on the design central axis corresponding to the central axis of the tire to be produced is derived based on the three-dimensional measurement data on the mounting plane and the three-dimensional measurement data on the tire surface of the mold member. And setting the derived one point as a measurement data reference point in the mold member three-dimensional measurement data, setting a measurement data reference point ,
By matching the measurement data reference point with the design data reference point in the three-dimensional design data corresponding to the measurement data reference point, the mold member three-dimensional measurement data and the three-dimensional design data are placed in the same coordinate space. In this arrangement state, a deviation amount between the three-dimensional measurement data of the mold member and the three-dimensional design data is derived,
In the comparison, based on the three-dimensional measurement data of the mounting plane, a first plane corresponding to the mounting plane is set, and the first plane is determined using the three-dimensional measurement data of the tire surface. Set a second plane through the parallel tire surfaces;
A plurality of combinations of two different points are extracted from the intersection line between the surface represented by the three-dimensional measurement data of the tire surface and the second plane, and each of a plurality of line segments connecting the two points of each combination 2 Deriving all of the intersections of two different perpendicular bisectors of the bisectors, and defining an axial center point representing the points on the design center axis based on the plurality of derived intersections,
A line passing through this axial center point and perpendicular to the first plane and a design center axis in the three-dimensional design data of the mold member corresponding to the center axis of the tire to be manufactured are matched, and the three-dimensional features and to filter ear type member inspection method that derives the deviation amount of the position other than the measurement data reference point of the measurement data. The tire mold member inspection method according to claim 9 , wherein a barycentric point of a plurality of derived intersections is derived as the axial point. The three-dimensional design data of the mold member is three-dimensional shape data having a perfect cross section represented by the design center axis and data of a radius of a tire to be manufactured.
In the comparison, the approximate center axis and the design center axis are matched,
The tire type member inspection method according to claim 9 or 10 , wherein a deviation amount between the three-dimensional measurement data and the three-dimensional design data having a perfect circular cross section is derived. An apparatus for inspecting the shape accuracy of a mold member for tire production, which is produced based on three-dimensional shape design data corresponding to the tread surface shape of a tire to be produced,
Means for acquiring the three-dimensional shape design data;
Means for measuring the three-dimensional shape of the mold member;
By comparing the three-dimensional measurement data of the mold member acquired by measurement and the three-dimensional design data of the mold member, a deviation amount of the shape of the produced mold member from the three-dimensional design data is derived. Means,
The mold member corresponds to one of the partial shapes obtained by dividing the tread surface shape for one round of the tire into a plurality of portions along the tire circumferential direction, and a plurality of the mold members are connected to each other to form a tire mold. Or a master mold for producing the partial mold ,
The means for measuring the three-dimensional shape of the mold member includes at least a surface shape of at least a part of the placement plane in a state where the mold member is placed on the placement plane of the substrate having the placement plane. Measure a three-dimensional shape of a tire surface which is a surface portion corresponding to the tread surface shape of the mold member and at least a part of a member back surface which is a surface of the mold member facing the tire surface. And
In the means for deriving, in the comparison, based on the three-dimensional measurement data of the mounting plane, the three-dimensional measurement data of the tire surface of the mold member, and the three-dimensional measurement data of the rear surface of the mold member , A measurement data reference point in the mold member three-dimensional measurement data is set, and the measurement data reference point is matched with a design data reference point in the three-dimensional design data corresponding to the measurement data reference point. Dimensional measurement data and the three-dimensional design data are arranged on the same coordinate space, and in this arrangement state, a deviation amount between the three-dimensional measurement data and the three-dimensional design data of the mold member is derived. A tire mold member inspection device. An apparatus for inspecting the shape accuracy of a mold member for tire production, which is produced based on three-dimensional shape design data corresponding to the tread surface shape of a tire to be produced,
Means for acquiring the three-dimensional shape design data;
Means for measuring the three-dimensional shape of the mold member;
By comparing the three-dimensional measurement data of the mold member acquired by measurement and the three-dimensional design data of the mold member, a deviation amount of the shape of the produced mold member from the three-dimensional design data is derived. Means,
The mold member corresponds to one of the partial shapes obtained by dividing the tread surface shape for one round of the tire into a plurality of portions along the tire circumferential direction, and a plurality of the mold members are connected to each other to form a tire mold. Or a master mold for producing the partial mold,
The means for measuring the three-dimensional shape of the mold member includes at least a surface shape of at least a part of the placement plane in a state where the mold member is placed on the placement plane of the substrate having the placement plane. , Measuring the three-dimensional shape of the mold member and the tire surface which is a surface portion corresponding to the tread surface shape;
In the means for deriving, on the basis of the design center axis corresponding to the center axis of the tire to be produced based on the three-dimensional measurement data of the mounting plane and the three-dimensional measurement data of the tire surface of the mold member at the time of comparison. Deriving at least one point, and setting the derived one point as a measurement data reference point in the mold member three-dimensional measurement data, and setting a measurement data reference point,
By matching the measurement data reference point with the design data reference point in the three-dimensional design data corresponding to the measurement data reference point, the mold member three-dimensional measurement data and the three-dimensional design data are placed in the same coordinate space. In this arrangement state, a deviation amount between the three-dimensional measurement data of the mold member and the three-dimensional design data is derived,
In the comparison, based on the three-dimensional measurement data of the mounting plane, a first plane corresponding to the mounting plane is set, and the first plane is determined using the three-dimensional measurement data of the tire surface. Set a second plane through the parallel tire surfaces;
A plurality of combinations of two different points are extracted from the intersection line between the surface represented by the three-dimensional measurement data of the tire surface and the second plane, and each of a plurality of line segments connecting the two points of each combination 2 Deriving all of the intersections of two different perpendicular bisectors of the bisectors, and defining an axial center point representing the points on the design center axis based on the plurality of derived intersections,
A line passing through this axial center point and perpendicular to the first plane and a design center axis in the three-dimensional design data of the mold member corresponding to the center axis of the tire to be manufactured are matched, and the three-dimensional A tire mold member inspection apparatus, wherein the deviation amount of a position other than the measurement data reference point of measurement data is derived.

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