JP2012176525A - Method of manufacturing tire vulcanization mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily execute positioning work when machining a segment material 25.SOLUTION: Holes 27 as reference marks are made in both the end surfaces 26 or the like of the segment material 25 in a tire width direction in casting. The positioning work is executed using the holes 27 when machining the segment material 25. Accordingly, the positioning work can be easily executed when machining the segment material 25, and its work efficiency is improved. Further, the segment material 25 can be simply attached to a positioning jig.

Description

    The present invention relates to a method for manufacturing a tire vulcanization mold having a plurality of arc-shaped segments having an arc shape.

    As a conventional method for manufacturing a tire vulcanization mold, for example, a method described in Patent Document 1 below is known.

JP 2006-076224 A

  This includes a step of forming a segment material that exhibits an arc shape by casting, and a step of machining the segment material to form an arc-shaped segment. Usually, the above-described machining is a segment material tire. After machining the one end surface in the width direction, positioning of the segment material using one end surface in the tire width direction after the machining, and machining to both end surfaces in the circumferential direction, Positioning of the segment material is performed using both end faces in the circumferential direction after the machining, and machining is performed on the other end face in the tire width direction, and then the other end face in the tire width direction is used after the machining. The segment material is positioned and the inner and outer peripheral surfaces are machined in order.

    However, in such a conventional method for manufacturing a tire vulcanization mold, the segment material is positioned again with reference to the surface that has just been machined, and then machined to the next surface. Therefore, it is necessary to position the segment material every time each surface of the segment material is machined. As a result, a lot of man-hours and time are required, resulting in a decrease in work efficiency. was there.

  An object of the present invention is to provide a method for manufacturing a tire vulcanization mold that can easily perform positioning when machining a segment material.

    Such an object is firstly a method for producing a tire vulcanization mold having a plurality of arc-shaped segments which are arc-shaped and have a molding surface on which an outer surface of the tire is molded on the inner peripheral surface of the tire width direction central portion. , A step of molding a segment material having a reference portion on both end faces in the tire width direction by casting, a step of positioning the segment material at the time of machining using the reference portion, and a machining of the positioned segment material This can be achieved by a method for manufacturing a tire vulcanization mold including the step of forming an arc segment by applying the above.

  Second, a method for producing a tire vulcanization mold having a plurality of arc-shaped segments each having an arc shape and having a molding surface on which an outer surface of the tire is molded on the inner peripheral surface in the tire width direction center, wherein the tire is formed from the molding surface. A step of molding a segment material having a reference portion on both inner peripheral surfaces located on both outer sides in the width direction by casting, a step of positioning the segment material at the time of machining using the reference portion, and positioning This can be achieved by a method for manufacturing a tire vulcanization mold including a step of machining a segment material to form an arc segment.

  3rdly, it is a manufacturing method of the tire vulcanization mold which has a plurality of arc-like segments in which the embossing surface which formed the arc shape and formed the tire outer surface on the inner peripheral surface of the tire width direction center was formed, A step of casting a segment material having a reference portion by casting, a step of positioning the segment material at the time of machining using the reference portion, and machining the positioned segment material to form an arc segment. This can be achieved by a method for manufacturing a tire vulcanization mold including the steps.

  In the invention according to claim 1, the segment material is positioned at the time of machining using the reference portions provided on both end faces in the tire width direction of the segment material, and in the invention according to claim 2. Is configured to perform positioning of the segment material during machining using reference portions provided on the inner peripheral surfaces of the outer sides of the segment material. Since the segment material is positioned during machining using the provided reference section, the segment material can be easily positioned during machining, improving work efficiency and simplifying It can also be attached to a positioning jig.

  According to the fourth aspect, the segment material can be positioned in the radial direction, that is, the segment material can be easily centered with respect to the processing apparatus with high accuracy. Here, when the reference portion is a protrusion, it is necessary to remove the protrusion after machining based on the protrusion. However, if the reference portion is a hole as described in claim 5, the removal operation is performed. This eliminates the need to improve the work efficiency, and after using the tire vulcanization mold for a long time, it can be easily machined based on the remaining dents when machining again. . Furthermore, if it comprises as described in Claim 6, the positioning of the segment raw material by the hole as a reference | standard part can be ensured.

1 is a front sectional view of a tire vulcanization mold showing Embodiment 1 of the present invention. It is a perspective view which shows the segment raw material immediately after casting. It is a side view explaining the process of calculating | requiring the relative positional relationship of the curvature center in a segment raw material. It is a side view explaining the other process of calculating | requiring the relative positional relationship of the curvature center in a segment raw material. It is a partially broken front view when the segment material is machined. It is a perspective view of the segment raw material just after casting which shows Embodiment 2 of this invention. It is a perspective view of the segment raw material just after casting which shows Embodiment 3 of this invention.

Embodiment 1 of the present invention will be described below with reference to the drawings.
1 and 2, reference numeral 10 denotes a plurality of sector segments arranged side by side in the circumferential direction, for example, 7 to 13 arc-shaped segments, and a central portion in the tire width direction on the inner circumferential surface 11 of these sector segments 10. Is formed with a molding surface (design surface) 12 for molding the outer surface of the unvulcanized tire, here mainly the outer surface of the tread portion, and the molding surface 12 is formed with a main groove extending in the circumferential direction on the tread portion. A plurality of protruding main bones 13 are provided. These sector segments 10 can be expanded and contracted synchronously in the radial direction by an expansion / contraction mechanism (not shown), and when moved to the inner limit in the radial direction, the circumferential end surfaces 14 of adjacent sector segments 10 are in close contact with each other ( Surface contact) to form a continuous ring. The plurality of sector segments 10 described above constitute a ring-shaped sector mold 15 as a whole.

  18 is a substantially bowl-shaped lower mold disposed immediately below the sector mold 15, and the upper surface of the lower mold 18 is molded with the outer surface of the unvulcanized tire, here mainly the outer surface of the lower sidewall portion. A molding surface (design surface) 19 is formed. 20 is a substantially bowl-shaped upper mold that can be raised and lowered arranged above the sector mold 15, and the lower surface of the upper mold 20 is the outer surface of the unvulcanized tire, here mainly the outer surface of the upper sidewall portion. A molding surface (design surface) 21 for molding is formed.

  Here, as described above, when the sector segment 10 moves to the inner limit in the radial direction and has a continuous ring shape, when the upper mold 20 and the lower mold 18 are in close contact with the sector segment 10 from above and below, A donut-shaped vulcanization space for accommodating an unvulcanized tire is formed in the sector segment 10 and in the lower and upper molds 18 and 20. The sector mold 15 and the lower and upper molds 18 and 20 as a whole constitute a tire vulcanization mold 22 for vulcanizing an unvulcanized tire accommodated in a vulcanization space together with a bladder (not shown).

  The sector segment 10 described above is usually formed by molding a segment material 25, which is a material of the sector segment 10, by molding a mold, and then casting an aluminum alloy and an iron-based alloy in the mold. The segment material 25 is manufactured by machining the surface thereof. Here, the reason why the segment material 25 is formed by the casting method is that the shape of the sector segment 10 is complicated and the corner shape is sharp, and it corresponds to the cast-in of a sipe blade that is a dissimilar metal. . Note that the above-described mold surface 12 is not machined and is usually used as-cast.

  Here, when the above-described segment material 25 is molded by casting, the both sides of the tire width direction end surface 26 of the segment material 25, that is, the width direction one side end surface 26a and the width direction other side end surface 26b are respectively used as reference portions. Hole 27, here two holes 27a and 27b are formed respectively, and these holes 27a and 27b are both circular holes with a bottom and are separated from each other in the circumferential direction. It is arrange | positioned at the circumferential direction both ends of the direction both end surface 26, respectively. In the present invention, a total of three reference portions are provided on one side in the width direction and the other side end surfaces 26a and 26b, for example, two on the one side end surface 26a in the width direction and one on the other side end surface 26b in the width direction. Only one may be provided.

  After the segment material 25 thus molded by casting is placed on a flat support table (not shown) with the molding surface 12 as the upper side, the molding surface 12 of the segment material 25 is then used using a three-dimensional measuring instrument. The shape of the inner peripheral surface in the circumferential direction, i.e., the position of the center of curvature of the molding surface 12 and the radius of curvature are measured, and the circumferential direction of both outer inner peripheral surfaces 31, 32 located on both outer sides in the tire width direction from the molding surface 12 The shape of the inner peripheral surface at, that is, the position of the center of curvature and the radius of curvature are measured. Then, from such a measurement result, the relative positional relationship between the center of curvature of the molding surface 12 and the center of curvature of the outer inner peripheral surfaces 31 and 32, that is, the direction and amount of displacement is obtained.

  Here, as the above-described three-dimensional measuring instrument 30, for example, while moving a laser sensor 33 as a non-contact probe as shown in FIG. 3 in the circumferential direction, the coordinates of the laser sensor 33 and the laser sensor 33 and the molding surface 12 are used. In addition, by measuring the distance between the outer inner peripheral surfaces 31 and 32, the inner peripheral surface shape of the mold surface 12 and the outer inner peripheral surfaces 31 and 32 can be measured. Further, by intermittently contacting the surface of the molding surface 12 and the outer inner circumferential surfaces 31, 32 while moving the contact probe in the circumferential direction, and measuring the coordinates of the contact position, the molding surface 12 and A device that measures the shape of the inner peripheral surfaces of the outer inner peripheral surfaces 31 and 32 is also known.

  The relative positional relationship between the center of curvature of the molding surface 12 and the center of curvature of the outer inner peripheral surfaces 31 and 32 is such that the tips of the support pins 36 are in contact with the outer inner peripheral surfaces 31 and 32, respectively, as shown in FIG. A center shaft 38 parallel to the center axis of the molding surface 12 is fixed to the center of the pair of fan-shaped support frames 37 and a dial gauge 39 is attached to the center shaft 38 between the pair of support frames 37. The swinging arm 40 attached to the center shaft 38 is supported so as to be swingable, and the swinging arm 40 is swung while the tip of the measurement spindle 39a of the dial gauge 39 is in contact with the molding surface 12. It can also be obtained by continuously measuring the distance to the surface 12 in the circumferential direction.

  Next, when machining the segment material 25, the segment material 25 is positioned with respect to the machining apparatus prior to the machining. In this case, first, as shown in FIG. 5, the segment material is formed by the lower positioning plates 43 and 44 with the one end surface 26a in the width direction on the upper side and the other end surface 26b in the width direction on the lower side. Hold 25 from above and below. At this time, only two columnar projections 43a are formed on the lower surface of the upper positioning plate 43, which are separated by the same distance as the distance between the holes 27a and have a complementary relationship with the hole 27a. Each is inserted into the hole 27a. On the other hand, on the upper surface of the lower positioning plate 44, only two columnar protrusions 44a are formed which are equidistant from the distance between the holes 27b and have a complementary relationship with the holes 27b. Insert each into 27b.

  As a result, the segment material 25 is positioned such as the front-rear direction, the left-right direction, the up-down direction, and the horizontal inclination at the time of machining, but at this time, the above-described center of curvature of the molding surface 12 and the outer peripheral surface 31, Based on the relative positional relationship with the center of curvature of 32, the outer circumferential surfaces 31, 32 are positioned in the radial direction, that is, the segment material 25 is centered with respect to the processing apparatus. In this way, if the segment material 25 is positioned at the time of machining using the hole 27 as the reference portion provided at the time of casting, the segment material 25 can be easily positioned at the time of machining. As a result, the work efficiency can be improved and it can be simply attached to the positioning jig, here, the upper and lower positioning plates 43 and 44.

  Here, between the step of molding the segment material 25 by casting as described above and the step of positioning with respect to the segment material 25, the center of curvature of the molding surface 12 and the center of curvature of the outer inner peripheral surfaces 31, 32 are provided. When the segment material 25 is positioned, the positioning in the radial direction is performed based on the outer peripheral surfaces 31 and 32 based on the relative positional relationship of the calculated curvature center. By doing so, the positioning of the segment material 25 in the radial direction, that is, the centering of the segment material 25 with respect to the processing apparatus can be performed easily and with high accuracy.

  In addition, although it is conceivable that the reference portion formed on the segment material 25 is a protrusion, in this case, it is necessary to remove the protrusion that becomes a hindrance when it remains after the machining with the protrusion as a reference. However, if the reference portion is configured with the bottomed hole 27 as in this embodiment, such removal work is unnecessary and work efficiency is improved, and after the tire vulcanization mold 22 is used for a long time. Again, when machining the sector segment 10, machining can be performed based on the remaining holes 27, and the work efficiency is improved. As described above, if the two or more holes 27 are formed on the outer inner peripheral surfaces 31 and 32 so as to be separated from each other, the positioning of the segment material 25 by the reference portion (hole 27) is ensured. can do.

  Next, the processing device is operated, and the processing tool 46 of the processing device performs machining, for example, cutting processing, grinding processing, on the segment material 25 that is positioned. It is performed on a surface other than the direction end faces 26, that is, at least one of the circumferential end faces 14, the outer inner peripheral faces 31, 32, or the outer peripheral face 47. Here, after machining all the above-mentioned surfaces, the segment material 25 is positioned again with reference to any of the machined surfaces, and the remaining surfaces (the tire width direction both end surfaces 26) Alternatively, machining may be applied to one or two surfaces, and then the segment material 25 is positioned again with reference to the machined surface, and the remaining surface All may be machined.

  In this way, after performing machining on any surface of the segment material 25, if the segment material 25 is re-positioned and machined on the remaining surface, the position of the segment material 25 is adjusted. Machining can be performed on all surfaces that need to be machined with a single change. As a result, the number of setups is reduced and work efficiency is improved. Miniaturization and cost reduction can be achieved. In addition, there is no restriction | limiting in particular in the order of machining with respect to each surface at this time. Then, as described above, when all the surfaces that need to be machined are machined, the segment material 25 becomes the sector segment 10.

    FIG. 6 is a diagram showing Embodiment 2 of the present invention. In this embodiment, holes 50 and 51 as reference portions are formed on both outer peripheral surfaces 31 and 32 of the segment material 25 at the time of casting, respectively, but these holes 50 and 51 are both bottomed. The circular holes are spaced apart from each other in the circumferential direction and are arranged at both ends in the circumferential direction of the outer inner circumferential surfaces 31 and 32. Then, the segment material 25 in which the holes 50 and 51 are formed on the outer inner peripheral surfaces 31 and 32 is then used to project the projections fitted into the holes 50 and 51, respectively. With the positioning plate on which is formed, positioning during machining is performed in the same manner as described above. Next, the positioned segment material 25 is machined in the same manner as described above, and the segment material 25 becomes the sector segment 10. Other configurations and operations are the same as those of the first embodiment.

    FIG. 7 is a diagram showing Embodiment 3 of the present invention. In this embodiment, holes 54 (holes 54a and 54b) are formed as reference portions on the circumferential end surfaces 14 of the segment material 25 at the time of casting, respectively. The holes are spaced apart in the vertical direction and are respectively disposed on the upper and lower ends of the circumferential end faces 14. Then, the segment material 25 in which such holes 54 are respectively formed in the circumferential end faces 14 is then used by the positioning plates on which the protrusions fitted respectively to the holes 54 are formed using the holes 54. In the same manner as described above, positioning during machining is performed. Next, the positioned segment material 25 is machined in the same manner as described above, and the segment material 25 becomes the sector segment 10. Other configurations and operations are the same as those of the first embodiment.

    Then, when machining was performed while positioning using the reference portion of the segment material 25 as described above, the setup process time could be reduced by about 29% compared to the case described in the background art. . In the above-described embodiment, the hole is used as the reference portion. However, in this invention, the reference portion may be formed of a rectangular or pentagonal groove, and the formed surface is the outer peripheral surface. In the case of a curved surface such as 31 and 32, the reference portion may be constituted by a flat surface having a certain area.

  The present invention can be applied to the industrial field of manufacturing a tire vulcanization mold having a plurality of arc-shaped segments exhibiting an arc shape.

10 ... Arc segment 11 ... Inner peripheral surface
12 ... Molding surface 14 ... End face in the circumferential direction
22 ... Tire vulcanizing mold 25 ... Segment material
26… End surface in the tire width direction 27, 50, 51, 54… Reference part
31, 32 ... Outer inner peripheral surface

Claims (6)

    A method for manufacturing a tire vulcanization mold having a plurality of arc-shaped segments each having an arcuate shape and formed with a molding surface that molds an outer surface of a tire on an inner circumferential surface in a tire width direction central portion, wherein reference portions are provided on both end surfaces in the tire width direction. Forming a segment material by casting, a step of positioning the segment material during machining using the reference portion, and a step of machining the positioned segment material to form an arc segment. A method for producing a tire vulcanization mold, comprising:     A method of manufacturing a tire vulcanization mold having a plurality of arc-shaped segments each having an arc shape and having a molding surface on which an outer surface of the tire is molded on an inner peripheral surface in a tire width direction central portion, and both outer sides in the tire width direction from the molding surface A step of molding a segment material having a reference portion on both outer inner peripheral surfaces located at a position, a step of positioning the segment material at the time of machining with respect to the segment material using the reference portion, and A method for manufacturing a tire vulcanization mold, comprising: a step of machining to form an arc segment.     A method for manufacturing a tire vulcanization mold having a plurality of arc-shaped segments having an arc shape and a molding surface on which an outer surface of a tire is molded on an inner peripheral surface of a tire width direction central portion, and having reference portions on both circumferential end surfaces A step of molding a segment material by casting, a step of positioning the segment material during machining using the reference portion, and a step of machining the positioned segment material to form an arc segment. A method for producing a tire vulcanization mold, characterized in that:     Between the step of molding the segment material by casting and the step of positioning with respect to the segment material, the center of curvature of the molding surface and the curvature of both outer peripheral surfaces located on both outer sides in the tire width direction from the molding surface A step of obtaining a relative positional relationship with the center is further provided, and when positioning the segment material, the positioning in the radial direction is performed based on the inner peripheral surfaces of both outer sides based on the relative positional relationship of the obtained curvature center. The method for producing a tire vulcanization mold according to any one of claims 1 to 3.     The tire vulcanization mold manufacturing method according to claim 1, wherein the reference portion is a bottomed hole.     The tire vulcanization mold manufacturing method according to claim 5, wherein two or more of the holes are spaced apart from each other.

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