JP5214673B2 - Tread manufacturing equipment - Google Patents

Description

  The present invention relates to a tread manufacturing apparatus, and more particularly to a tread manufacturing apparatus that simultaneously vulcanizes and molds a plurality of treads that are previously formed to have a predetermined length.

One method of manufacturing tires is to attach a tread that has been vulcanized and molded to the outer circumference of the base tire, which is the base of the tire, to integrate the base tire and the tread. A tire manufacturing method is known.
The tread manufacturing apparatus for manufacturing the tread has a pair of platens for heating the unvulcanized tread so as to overlap each other at a predetermined distance, and a pair of treads and non-treads are molded between the platens. Place each mold. A mold for molding the tread is fixed to the upper surface of the platen, and a mold for molding the non-tread is fixed to the lower surface of the platen.
Then, by pressing the platens arranged at a predetermined distance away from each other by pressing, the tread arranged in the molding space of the mold for molding the tread is molded, and the plurality of platens are formed at the same predetermined temperature and The tread is vulcanized by heating for a predetermined time. A plurality of vulcanized treads are manufactured simultaneously by separating the platens after a predetermined time has elapsed.

However, since the temperature of the plurality of platens is set to be the same when the tread is vulcanized, it is vulcanized again in the subsequent process in which the tread manufactured as described above and the base tire are integrated. When the tread surface is overvulcanized more than the non-tread surface, or the non-tread surface bonded to the base tire and the cushion rubber is overvulcanized, resulting in poor adhesion between the base tire and the tire. There is a case.
In the former case, when the tread is vulcanized, it is preferable that the non-tread surface of the tread is more vulcanized than the tread surface. In the latter case, when the tread is vulcanized, the tread surface is It is preferable that vulcanization proceeds more than the non-tread surface. For example, changing the set temperature of the platen and setting the temperature difference in the platen so that the non-tread surface of the tread advances more than the tread surface, or the platen so that the tread surface advances more than the non-tread surface Although a method of providing a temperature difference is conceivable, even if a temperature difference is generated in the platen, the molds fixed to the platen are in direct contact with each other, so that the mold conducts heat so as to cancel the temperature difference of the platen. After a certain period of time, the temperature of the platen that heats the tread surface and the non-tread surface becomes the same, and the difference in vulcanization progress cannot be suitably set between the tread surface and the non-tread surface. It was.

JP 2008-120044 A

  In order to solve the above problems, the present invention causes a difference in the progress of vulcanization between the tread surface and the non-tread surface when a plurality of treads having a predetermined length are superimposed and simultaneously vulcanized, and Provided is a tread production apparatus capable of making the progress of vulcanization of all treads to be superimposed uniform.

As a configuration for solving the above-mentioned problems, a tread mold having a molding surface for molding the tread surface of the tread and a molding space closed by a non-tread mold for molding a non-tread surface opposite to the tread surface of the tread are provided. A tread manufacturing apparatus comprising a mold, a first heating means for heating a tread mold, and a second heating means for heating a non-tread mold, and vulcanizing and molding an unvulcanized tread disposed in a molding space. Thus, the temperature of the tread heated by the first heating means is set to be different from the temperature of the non-tread heated by the second heating means.
According to this configuration, since the temperature of the first heating means for heating the tread mold and the temperature of the second heating means for heating the non-tread mold are set to be different, the tread tread and non-tread Can be vulcanized at different temperatures, and a difference can be caused in the progress of vulcanization between the tread surface and the non-tread surface.
As another configuration, the tread mold and the non-tread mold are closed through a heat insulating material disposed on the contact surface.
According to this configuration, when the tread mold and the non-tread mold are in contact with each other via the heat insulating material, the heat of the first heating means for heating the tread mold and the second heating means for heating the non-tread mold. Therefore, the tread surface and the non-tread surface can be vulcanized in an independent state, and a difference can be caused in the progress of vulcanization between the tread surface and the non-tread surface.
As another configuration, the tread mold has a flat surface surrounding the molding surface, and the heat insulating material is arranged on the flat surface.
According to this configuration, since the heat insulating material is provided on the flat surface surrounding the periphery of the molding surface, the first heating means for heating the tread mold even if the tread mold is replaced with a tread mold having a different pattern. Therefore, the tread surface and the non-tread surface can be vulcanized at different temperatures in an independent state.
Further, as another configuration, a tread manufacturing apparatus in which the mold according to any one of claims 1 to 3 is superposed in a vertical direction, and a first heating unit positioned between adjacent molds in the vertical direction; The second heating means is spaced apart in the vertical direction via the heat insulating means, and the first heating means and the second heating means that are spaced apart in the vertical direction, the lower second heating means is the lower surface. And a non-treading mold, and the upper first heating means has a treading mold on the upper surface.
According to the present invention, the first heating means for heating the tread mold and the second heating means for heating the non-tread mold when the tread is vulcanized while the superimposed mold is pressurized by a press. By providing a heat insulating means between them, the heat of the first heating means for heating the tread mold and the heat of the second heating means for heating the non-tread mold do not interfere with each other, so It can be heated and vulcanized independently. Therefore, it is possible to make a difference in the progress of vulcanization between the tread surface and the non-tread surface of each tread that is superimposed, and it is possible to make the progress of vulcanization of all the treads that are superimposed even.
Moreover, the heat insulation means was comprised with the heat insulating material as another structure.
According to this configuration, since the temperature of the tread mold and the temperature of the non-tread mold are blocked by the heat insulating material, the tread and non-tread surfaces of the tread can be heated and vulcanized independently. Therefore, it is possible to make a difference in the progress of vulcanization between the tread surface and the non-tread surface of each tread that is superimposed, and it is possible to make the progress of vulcanization of all the treads that are superimposed even.
Moreover, the heat insulation means was comprised by the space | gap as another structure.
According to this configuration, since the temperature of the tread mold and the temperature of the non-tread mold are blocked by the gap, the tread and non-tread surfaces of the tread can be independently heated and vulcanized. Therefore, it is possible to make a difference in the progress of vulcanization between the tread surface and the non-tread surface of each tread that is superimposed, and it is possible to make the progress of vulcanization of all the treads that are superimposed even.

The side view and top view of a tread manufacturing device concerning the present invention. The elements on larger scale which show arrangement | positioning of the platen and metal mold | die which concern on this invention. The perspective view and sectional drawing of the metal mold | die which concerns on this invention. The layout of a metal mold | die and a platen when carrying out vulcanization molding of the tread which concerns on this invention. The figure which shows the test result for verifying the effect of the tread manufacturing apparatus which concerns on this invention. The figure which shows the other form of the platen which concerns on this invention.

  Hereinafter, the present invention will be described in detail through embodiments of the invention. However, the following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are included in the invention. It is not necessarily essential to the solution, but includes a configuration that is selectively adopted.

Embodiment 1
FIG. 1 shows a schematic configuration as an example of a tread manufacturing apparatus 1 (a side view and a front view). FIG. 2 is a partially enlarged view showing the arrangement of the platen and the mold. Hereinafter, the tread manufacturing apparatus 1 of this invention is demonstrated using FIG.1 and FIG.2.
The tread manufacturing apparatus 1 generally includes a frame 2 erected on the floor of a factory, a press apparatus 3, and a vulcanizing apparatus 4.
The frame 2 includes a plurality of support columns 21A to 21D, intermediate beams 22 and 22 that connect columns disposed in the longitudinal direction at intermediate portions of the support columns 21A to 21D, and support columns 21A to 21D on the upper side of the intermediate beams 22 and 22. The upper beams 23 and 23 for connecting the support columns at the upper end of the frame and the top plate 24 are formed in a gate shape.
The struts 21 </ b> A to 21 </ b> D are made of, for example, a steel material having an H-shaped section having an equal length, and are erected on a rectangular corner floor. Further, the pillars 21A and 21B and the pillars 21C and 21D forming the short sides are arranged so that the concave portions of the H-shaped cross section face each other. A pair of rails 25 having an I-shaped cross section are fixed along the extending direction in the recesses facing the columns 21A, 21B and the columns 21C, 21D. Further, notches for fixing the intermediate beams 22 and 22 and the upper beams 23 and 23 are formed on the outer side at the intermediate portion and the upper end side of the columns 21A to 21D.

The intermediate beams 22 and 22 are made of a steel material having a rectangular cross section, and the support columns 21A and 21C and the support columns 21B, 21B, 21C, and the support columns 21B, 21D are formed through the notches formed outside the support columns 21A and 21C and the support columns 21B and 21D. It is fixed to 21D.
The upper beams 23 and 23 are respectively fixed to the columns 21A and 21C and the columns 21B and 21D through notches formed on the upper ends of the columns 21A and 21C and the columns 21B and 21D to which the intermediate beams 22 and 22 are fixed. The
The top plate 24 is formed in a rectangular shape larger than the region surrounded by the columns 21A to 21D, and is fixed to the upper beams 23 and 23 and the upper ends of the columns 21A to 21D. On the lower surface 24 a of the top plate 24, an upper press table that is paired with a lower press table of the press device 3 described later is disposed. The details of the upper press stand will be described later.
A plurality of platen frames that move along the rails 25 and 25 and hold a plurality of platens described later are disposed along the rails 25 and 25.

The press apparatus 3 is arrange | positioned on the floor surface surrounded by support | pillar 21A-21D, for example. The press device 3 is roughly configured by a plurality of hydraulic cylinders 31, a hydraulic control valve 32 that controls the hydraulic pressure to the hydraulic cylinder 31, a hydraulic pump 33 that generates hydraulic pressure, and upper and lower press stands 34A and 34B.
The plurality of hydraulic cylinders 31 are equally disposed in the center of the columns 21A and 21B disposed in the short direction and in parallel with the columns 21A and 21C disposed in the longitudinal direction. A hydraulic hose 35 that individually extends from the hydraulic control valve 32 is connected to the plurality of hydraulic cylinders 31, and a hydraulic hose 36 from a hydraulic pump 33 that generates hydraulic pressure by a motor (not shown) is connected to the hydraulic control valve 32. . The hydraulic control valve 32 includes a control mechanism that electrically controls the hydraulic pressure, is connected to a control device (not shown), and controls expansion and contraction of the piston 31A of the hydraulic cylinder 31 based on a signal output from the control device.

The upper and lower press stands 34A and 34B are metal plates formed in the same size in a rectangular shape having a size one size larger than a mold for vulcanizing and molding the tread 11 to be molded. The material of the upper and lower press stands 34A and 34B is made of, for example, a material having lower thermal conductivity than the mold. The upper press table 34A is fixed to the top plate 24, and the lower press table 34B is fixed to the upper end surfaces 31a of the pistons 31A of the plurality of hydraulic cylinders 31.
Between the upper press table 34A and the lower press table 34B, a plurality of platens 41 to 45 are arranged so as to overlap each other.

The vulcanizer 4 includes a plurality of platens 41 to 45, platen frames 52 to 54 that hold the platens, and heat supply means 46 that supplies a thermal fluid to the platens 41 to 45.
The platens 41 to 45 are arranged, for example, in five stages between the upper and lower press stands 34A and 34B so as to overlap in the vertical direction. Each of the platens 41 to 45 is formed of a flat metal plate that is formed in a rectangular shape having the same size as the upper and lower press stands 34A and 34B, and whose upper and lower surfaces are parallel to each other and finished to a flat surface. In addition, a plurality of flow paths 47 penetrating the platens 41 to 45 in the extending direction are arranged in the short direction in the platens 41 to 45.
That is, the platen 41 constitutes a first heating means for heating the tread mold 61 and the platen 45 constitutes a second heating means for heating the non-tread mold 68. In the platen 42 to platen 44, the upper surface side constitutes first heating means for heating the tread dies 62 to 64, and the lower surface side constitutes second heating means for heating the non-tread dies 65 to 67.

  The platen 41 is fixed to the upper surface of the lower press table 34B, the platens 42 to 44 are held by the platen frames 52 to 54, and the platen 45 is fixed to the lower surface of the upper press table 34A.

The platen frames 52 to 54 for holding the platens 42 to 44 are respectively constituted by a pair of holding frames 55A and 55B and wheels 56A and 56B attached to the holding frames 55A and 55B.
The holding frames 55 </ b> A and 55 </ b> B are made of a rod-like body having a rectangular cross section, have a length equal to the length in the longitudinal direction of the platens 42 to 44, and are fixed to the side surfaces in the longitudinal direction of the platens 42 to 44.
The wheels 56A and 56B protrude in the horizontal direction from the side surfaces of the holding frames 55A and 55B, and are rotatably mounted at positions corresponding to the rails 25 and 25. The wheels 56 </ b> A and 56 </ b> B are formed in a flange-shaped cross-section H shape on both sides so as to sandwich the rails 25 and 25. The platen frames 52 to 54 are arranged at a predetermined distance from each other by a positioning device (not shown) provided on the columns 21A to 21D. Further, the positioning device operates only when the platen frames 52 to 54 are separated from each other, and does not operate when the platen 41 to 44 is moved in the upper one direction by the press device 3.

In the following description, the lowermost platen 41 is the first platen 41, the second platen 42 from the bottom is the second platen 42, the third platen 43 from the bottom is the third platen 43, and the second platen is from the top. The platen 44 is referred to as a fourth platen 44, and the platen 45 located at the uppermost position is referred to as a fifth platen 45.
The first platen 41 is provided on the upper surface of the lower press table 34B, the second platen 42 is held by the platen frame 52 positioned immediately above the lower press table 34B, and the third platen 43 holds the second platen 42. The platen frame 53 is held above the platen frame 52 to be held. The fourth platen 44 is held by a platen frame 54 positioned above the platen frame 53 that holds the third platen 43. The fifth platen 45 is provided on the lower surface of the upper press table 34A.

The heat supply means 46 includes a steam generator (not shown) that generates steam to be supplied to the flow paths 47 of the platens 41 to 45, and a supply pipe that supplies the steam from the steam generators to the flow paths 47 of the platens 41 to 45. 48, the recovery pipe 49 for recovering the steam discharged from the flow path 47 to the steam generator, and the platens 41 to 45 when the platens 41 to 45 are located at positions where the tread 11 is vulcanized. The supply coupler 50 includes a plurality of flow paths for supplying steam to all one openings of the plurality of flow paths 47, and a recovery coupler 51 that recovers steam from all the other openings.
The steam generator is configured by a boiler or the like that generates high-temperature water vapor, and includes a supply port 46A that supplies high-temperature water vapor and a recovery port 46B that collects water vapor via the platens 41 to 45.
The supply coupler 50 includes a plurality of supply couplers 50 for supplying steam to all the one openings of the plurality of flow paths 47 of the platens 41 to 45 when the platens 41 to 45 are positioned at positions where the tread 11 is vulcanized. The flow path is provided. A plurality of recovery couplers 51 are provided for recovering steam from all the other openings of the plurality of flow paths 47 of the respective platens 41 to 45 when the respective platens 41 to 45 are positioned at the positions where the tread 11 is vulcanized. The flow path is provided. The supply pipe 48 has one end connected to the supply port 46 </ b> A and the other end connected to the supply coupler 50. One end of the recovery pipe 49 is connected to the recovery port 46 </ b> B, and the other end is connected to the recovery coupler 51.

  The molding apparatus 6 includes a plurality of molds including a tread mold that molds the tread 11a of the tread 11 and a non-tread mold that molds the non-tread 11b. Each mold is overlapped in the vertical direction so as to be disposed between the platens. More specifically, a tread mold 61 for molding the tread 11a and a non-tread mold 65 for molding the non-tread 11b constitute a pair of molds, and a tread mold 62 for molding the tread 11a and the non-tread 11b are molded. A non-treading mold 66 that forms a pair of molds, and a treading mold 63 that molds the treading surface 11a and a non-treading surface mold 67 that molds the nontreading surface 11b constitutes a pair of molds, and the treading surface 11a is molded. The tread mold 64 and the non-tread mold 68 for molding the non-tread 11b constitute a pair of molds. In the first embodiment, each mold is described as a tread pattern having the same shape formed on the tread 11. However, the superimposed molds may have different tread patterns.

FIG. 3 shows a perspective view and a cross-sectional view of the tread molds 61 to 64 for molding the tread 11.
The tread dies 61 to 64 have, for example, a size for molding the tread 11 to have a length corresponding to one tire lap or a length shorter than one tire lap, and the tread 11 serving as the tread 11a of the tire. A molding surface 60a for forming a geometric groove, a frame body 60b that surrounds the periphery of the molding surface 60a to mold the tread 11 into a predetermined width and length, and molds the side surface of the tread 11. And a heat insulating material 70 disposed on a flat surface 60d formed on the upper surface along the outer peripheral edge of the body 60b.
The heat insulating material 70 is made of, for example, a sintered carbon fiber or glass fiber.
The heat insulating material 70 disposed on the flat surface 60d of the frame 60b is configured such that the tread molds 61 to 64 and the non-tread molds 65 to 68 come into contact with each other and the molding space 60c is closed. Thru | or 64, it forms so that it may become flush with the edge part by the side of a molding surface. Therefore, when the tread 11 is molded using the press device 3, the molding space 60c is provided via the heat insulating material 70 disposed on the contact surface where the tread dies 61 to 64 and the non-tread dies 65 to 68 contact each other. Is blocked.

The tread mold 61 is fixed to the upper surface of the first platen 41, the tread mold 62 is fixed to the upper surface of the second platen 42, the tread mold 63 is fixed to the upper surface of the third platen 43, and the tread mold 64 is It is fixed to the upper surface of the fourth platen 44.
The non-tread dies 65 to 68 have a size capable of closing the molding space 60c of the tread dies 61 to 64. For example, the non-tread dies 65 to 68 have a flat plate shape that is the same as or slightly larger than the tread dies 61 to 64. It consists of a metal plate.
The non-tread surface mold 65 is fixed to the lower surface of the second platen 42, the non-tread surface mold 66 is fixed to the lower surface of the third platen 43, and the non-tread surface mold 67 is fixed to the lower surface of the fourth platen 44. The mold 68 is fixed to the lower surface of the fifth platen 45.

Therefore, the tread 11 molded by the molding apparatus 6 is molded with the tread 11a and side surfaces of the tread 11 by the tread dies 61 to 64, and the non-tread 11b of the tread 11 is molded by the non-tread dies 65 to 68. This is a configuration.
Hereinafter, the tread mold 61 fixed to the upper surface of the first platen 41 is the first tread mold 61, the tread mold 62 fixed to the upper surface of the second platen 42 is the second tread mold 62, and the third platen 43. The tread mold 63 fixed to the upper surface of the first plate is referred to as a third tread mold 63, and the tread mold 64 fixed to the upper surface of the fourth platen 44 is referred to as a fourth tread mold 64.
Further, the non-treading surface mold 65 fixed to the second platen 42 is fixed to the first non-treading surface mold 65, and the non-treading surface mold 66 fixed to the lower surface of the third platen 43 is set to the second non-treading surface mold 66. The non-treading surface mold 67 fixed to the fourth platen 44 is referred to as a third non-treading surface mold 67, and the non-treading surface mold 68 fixed to the lower surface of the fifth platen 45 is referred to as a fourth non-treading surface mold 68.

Hereinafter, the vulcanization molding process of the tread 11 by the tread manufacturing apparatus 1 having the above configuration will be described.
The tread 11 formed into a predetermined cross-sectional shape and length by an extrusion molding machine (not shown) and transported is placed in a molding space 60c surrounded by the frame body 60b of the first tread mold 61 to the fourth tread mold 64, respectively. To do.
Next, the hydraulic pump 33 is driven to generate hydraulic pressure, and the hydraulic control valve 32 is controlled to extend the piston 31A of the hydraulic cylinder 31.
Then, when the lower press table 34B moves upward, the heat insulating material 70 of the first tread mold 61 together with the first platen 41 is pressed by the first non-tread mold 65 fixed to the lower surface of the second platen 42.
Next, the second platen 42 is pushed up, and the heat insulating material 70 of the second tread mold 62 is pressed by the second non-tread mold 66 fixed to the lower surface of the third platen 43. Next, the third platen 43 is pushed upward, and the heat insulating material 70 of the third tread mold 63 is pressed by the third non-tread mold 67 fixed to the lower surface of the fourth platen 44. Next, the fourth platen 44 is pushed upward, and the heat insulating material 70 of the fourth tread mold 64 is pressed by the fourth non-tread mold 68 fixed to the lower surface of the fifth platen 45 to set the hydraulic control valve 32. When the pressed pressure is applied to the hydraulic cylinder 31, pressurization is stopped while the press pressure is maintained.
Therefore, the unvulcanized tread 11 disposed in each mold is molded into a desired shape.

  Next, the supply coupler 50 and the recovery coupler 51 that supply steam to the first platen 41 to the fifth platen 45 are connected to the plurality of flow paths 47. Next, steam heated to a predetermined temperature from the heat supply means 46 is supplied to the first platen 41 to the fifth platen 45 via the supply pipe 48 and the supply coupler 50, and the first platen 41 to the fifth platen 45. The steam that has passed through the flow path 47 is recovered by the heat supply means 46 via the recovery coupler 51 and the recovery pipe 49, and the first platen 41 to the fifth platen 45 are heated by the recirculation of the steam.

Thereafter, the first platen 41 to the fifth platen 45 are heated, and the tread 11 is passed through the first tread mold 61 to the fourth tread mold 64 and the first non-tread mold 65 to the fourth non-tread mold 68. The flow of heat around the first tread mold 61 to the fourth tread mold 64 and the first non-tread mold 65 to the fourth non-tread mold 68 when vulcanizing is described in detail.
FIG. 4 shows the positions of the dies 61 to 64, 65 to 68 and the platens 41 to 45 when the tread 11 is vulcanized.
In the tread 11 vulcanized and molded by the first tread mold 61 and the first non-tread mold 65, the molding surface of the first tread mold 61 is transmitted to the tread 11a by conduction of heat from the upper surface of the first platen 41. The non-tread surface 11b is heated by the first non-tread surface mold 65 by conducting heat from the lower surface of the second platen 42. Specifically, the first tread mold 61 and the first non-tread mold 65 are brought into contact with each other via a heat insulating material 70 provided on the flat surface 60d of the frame body 60b of the first tread mold 61. Further, the surface of the tread 11 faces the tread 11a side without the heat of the first tread mold 61 heated by the first platen 41 and the heat of the first non-tread mold 65 heated by the second platen 42 interfering with each other. And heated and vulcanized independently from the non-tread surface 11b side.
That is, in the tread 11, the first tread mold 61 and the first non-tread mold 65 that are in contact with each other via the heat insulating material 70 are heated by the first platen 41 and the second platen 42 having the same amount of heat. Accordingly, the heating by the first non-treading surface mold 65 having a small surface area is higher in temperature than the first treading surface mold 61 having a large surface area due to the unevenness. That is, in the tread 11 heated by the first platen 41 and the second platen 42, the temperature on the non-treading surface 11b side is higher than that on the treading surface 11a, and the non-treading surface 11b is more vulcanized than the treading surface 11a. Becomes faster.
Further, in the tread 11 vulcanized and molded by the second tread mold 62 and the second non-tread mold 66, the tread 11 a conducts heat from the upper surface of the second platen 42, so that the second tread mold 62 The non-tread surface 11 b is heated by the second non-tread surface mold 66 by the conduction of heat from the lower surface of the third platen 43. Specifically, the second tread mold 62 and the second non-tread mold 66 are brought into contact with each other via a heat insulating material 70 provided on the flat surface 60d of the frame 60b of the second tread mold 62. Further, the surface of the tread 11 does not interfere with the heat of the second tread mold 62 heated by the second platen 42 and the heat of the second non-tread mold 66 heated by the third platen 43 on the tread 11a side. And heated and vulcanized independently from the non-tread surface 11b side.
That is, in the tread 11, the second tread mold 62 and the second non-tread mold 66 that are in contact with each other via the heat insulating material 70 are heated by the second platen 42 and the third platen 43 having the same amount of heat. Accordingly, the heating by the second non-treading mold 66 having a small surface area is higher in temperature than the second treading mold 62 having a large surface area due to the unevenness. That is, the temperature of the tread 11 heated by the second platen 42 and the third platen 43 is higher on the non-treading surface 11b side than the treading surface 11a, and the non-treading surface 11b is more vulcanized than the treading surface 11a. Becomes faster.
Further, in the tread 11 vulcanized and molded by the third tread mold 63 and the third non-tread mold 67, heat from the upper surface of the third platen 43 is conducted to the tread 11 a, thereby the third tread mold 63. The non-tread surface 11 b is heated by the third non-tread surface mold 67 by the conduction of heat from the lower surface of the fourth platen 44. Specifically, the third tread mold 63 and the third non-tread mold 67 are brought into contact with each other via a heat insulating material 70 provided on the flat surface 60d of the frame body 60b of the third tread mold 63. The surface of the tread 11 is made to face the tread 11a without the heat of the third tread mold 63 heated by the third platen 43 and the heat of the third non-tread mold 67 heated by the fourth platen 44 interfering with each other. And heated and vulcanized independently from the non-tread surface 11b side.
That is, in the tread 11, the third tread mold 63 and the third non-tread mold 67 that are in contact with each other via the heat insulating material 70 are heated by the third platen 43 and the fourth platen 44 having the same amount of heat. Accordingly, the heating by the third non-treading mold 67 having a small surface area is higher in temperature than the third treading mold 63 having a large surface area due to the unevenness. That is, the tread 11 heated by the third platen 43 and the fourth platen 44 has a higher temperature on the non-treading surface 11b side than the treading surface 11a, and the non-treading surface 11b is more vulcanized than the treading surface 11a. Becomes faster.
Further, in the tread 11 that is vulcanized and molded by the fourth tread mold 64 and the fourth non-tread mold 68, heat from the upper surface of the fourth platen 44 is transmitted to the tread 11 a, so that the fourth tread mold 64. The non-tread surface 11 b is heated by the fourth non-tread surface mold 68 when the non-tread surface 11 b conducts heat from the lower surface of the fifth platen 45. Specifically, the fourth tread mold 64 and the fourth non-tread mold 68 are brought into contact with each other via a heat insulating material 70 provided on the flat surface 60d of the frame body 60b of the fourth tread mold 64. The surface of the tread 11 faces the tread 11a side without the heat of the fourth tread mold 64 heated by the fourth platen 44 and the heat of the fourth non-tread mold 68 heated by the fifth platen 45 interfering with each other. And heated and vulcanized independently from the non-tread surface 11b side.
That is, in the tread 11, the fourth tread mold 64 and the fourth non-tread mold 68 that are in contact with each other via the heat insulating material 70 are heated by the fourth platen 44 and the fifth platen 45 having the same amount of heat. Accordingly, the heating by the fourth non-treading mold 68 having a small surface area is higher in temperature than the fourth treading mold 64 having a large surface area due to the unevenness. In other words, the tread 11 heated by the fourth platen 44 and the fifth platen 45 has a higher temperature on the non-treading surface 11b side than the treading surface 11a, and the non-treading surface 11b is more vulcanized than the treading surface 11a. Becomes faster.
That is, by providing the heat insulating material 70 on the flat surface 60d formed on the frame body 60b of the first tread mold 61 to the fourth tread mold 64, the first tread mold 61 to the fourth tread mold 64 are changed. Heat of the first platen 41 to the fifth platen 45 to be heated is not conducted to the first non-tread surface mold 65 to the fourth non-tread surface mold 68. Accordingly, the first tread mold 61 and the first non-tread mold 65, the second tread mold 62 and the second non-tread mold 66, the third tread mold 63, the third non-tread mold 67, and the fourth tread. The tread 11 that is vulcanized and molded by the mold 64 and the fourth non-tread surface mold 68 is individually heated, and the tread surface 11a and the non-tread surface 11b of each tread 11 are vulcanized at different temperatures. For this reason, the tread 11 that is vulcanized and superimposed has no variation in the progress of vulcanization, and the non-tread surface 11b can be set to a state in which vulcanization has progressed more than the tread surface 11a.

Next, after a predetermined time has elapsed from the start of heating the tread 11 by the first platen 41 to the fifth platen 45, the supply of steam from the steam generator to the first platen 41 to the fifth platen 45 is stopped, and vulcanization is performed. finish. Then, the supply coupler 50 and the recovery coupler 51 are removed from the first platen 41 to the fifth platen 45, the pressure of the hydraulic cylinder 31 is released, and the first tread mold 61 to the fourth tread mold 64 and the first non-tread. The pressurization to the mold 65 to the fourth non-tread mold 68 is released. Accordingly, the first tread mold 61 together with the first platen 41 is separated from the first non-tread mold 65 of the second platen 42, and the second tread mold 62 together with the second platen 42 is separated from the second non-tread of the third platen 43. The third tread mold 63 is separated from the third tread mold 66 together with the third platen 43, and the third tread mold 67 is separated from the third non-tread mold 67 of the fourth platen 44. The platen 45 is separated from the fourth non-treading surface mold 68.
Then, by removing the tread 11 that has been vulcanized and molded from the molding space 60c of the first tread molds 61 to 64, a plurality of vulcanized treads 11 are manufactured in a single step.

[Experimental example]
In order to verify the above effect, in the vulcanization molding of the tread 11 by the conventional tread manufacturing apparatus that does not include the heat insulating material 70 in the tread mold and the tread manufacturing apparatus of the present invention shown in FIGS. The progress of the degree of vulcanization with the inside of the tread was examined, and the results are shown in FIGS. 5 (a) and 5 (b). FIG. 5A shows the tread surface and the inside of the tread 11 vulcanized and molded by the first tread mold and the first non-tread mold 65 when the heat insulating material 70 positioned at the lowest position in FIG. 2 is not provided. Shows the time change of the degree of vulcanization. FIG. 5 (b) shows the change over time in the degree of vulcanization between the tread surface of the tread 11 vulcanized by the first tread mold 61 and the first non-tread mold 65 located at the lowest position in FIG. Indicates. The tread surface refers to the surface of the tread 11a, and the tread interior refers to the center of the tread thickness.
As shown in FIG. 5 (a), the tread 11 vulcanized and molded by a conventional vulcanizing device has a first non-heated heat from the first platen 41 through the frame body 60b of the first tread mold 61. Since it is conducted to the tread mold 65, the temperature surrounding the tread 11 rises rapidly, so that the temperature of the tread surface rises following this, and vulcanization proceeds rapidly. However, since the heat conduction speed of the rubber constituting the tread 11 is slower than the heating speed at which the tread surface is heated, the temperature rise inside the tread is delayed from the tread surface by the rubber thickness. That is, a difference in the degree of vulcanization between the tread surface and the inside of the tread is caused by the delay in the temperature rise inside the tread with respect to the tread surface. The difference in vulcanization degree immediately after the start of vulcanization is expected to decrease as the vulcanization degree inside the tread approaches the vulcanization degree on the tread surface as the vulcanization time progresses. As shown to (a), it will be in an equilibrium state, with the difference immediately after a vulcanization start maintained. This is presumably because the thermal conductivity of the tread surface decreased as the degree of vulcanization of the tread surface progressed, making it difficult for heat to be conducted inside the tread.
On the other hand, as shown in FIG. 5B, in the tread 11 by the tread manufacturing apparatus 1 of the present invention, heat from the first platen 41 is on the tread surface 11a side of the tread 11, and heat from the second platen 42 is non-tread surface 11b. By separately heating the sides, the heat surrounding the tread 11 is not generated abruptly as in the prior art, so the tread 11 is gradually heated from the tread surface 11a side and the non-tread surface 11b side, The tread surface 11a and the non-tread surface 11b are vulcanized at different temperatures, and the difference between the degree of vulcanization on the tread surface and the degree of vulcanization inside the tread as the vulcanization progresses is small. The vulcanization process is maintained until equilibrium is reached.
Therefore, as can be seen from FIGS. 5A and 5B, in the conventional tread manufacturing apparatus and the tread manufacturing apparatus of the present invention, the difference between the vulcanization degree on the tread surface and the vulcanization degree inside the tread is about There will be a difference of 3 times. That is, in the tread 11 vulcanized by the manufacturing apparatus of the present invention, the degree of progress of vulcanization between the tread surface and the inside of the tread is closer than before, so the non-tread surface 11b side proceeds slightly more than the tread surface 11a side. Thus, it is possible to manufacture the tread 11 vulcanized in the state. And the tire manufactured by adhering the said tread 11 to a base tire via cushion rubber has a small rolling resistance, and can improve the fuel consumption of the vehicle equipped with the tire.

Embodiment 2
FIG. 6 is a diagram showing the configuration of another form of the platen.
It has been found that the difference in the degree of vulcanization (the progress of vulcanization) between the tread surface and the inside of the tread can be reduced by vulcanizing and molding the tread 11 with the production apparatus 1 of the present invention of the first embodiment.
Therefore, in the second embodiment, a description will be given of the tread manufacturing apparatus 1 that prevents variations in the progress of vulcanization in each of the superimposed dies 61 to 64.
In the second embodiment, the second platen 42, the third platen 43, and the fourth platen 44 of the first embodiment are respectively divided into two upper and lower parts, a platen that heats the non-treading surface 11b side and a platen that heats the treading surface 11a side. This is different from the first embodiment in that it is divided. In addition, about the same structure as the manufacturing apparatus 1 of Embodiment 1, it abbreviate | omits.

Hereinafter, the configuration of the second platen 42 to the fourth platen 44 will be described.
The second platen 42 according to the first embodiment is divided into a second A platen 42A for heating the first non-treading surface mold 65 and a second B platen 42B for heating the second tread surface mold 62, and the second A platen 42A and the second B. A heat insulating means is arranged between the platen 42B and a single structure. A heat insulating material 71 is disposed in the heat insulating means.
The second A platen 42A and the second B platen 42B are made of, for example, a flat metal plate having the same size and half the thickness as the second platen 42 used in the first embodiment. A plurality of channels 47A and 47B extending in the width direction are provided.
For the heat insulating material 71, the same material as the heat insulating material 70 used on the upper surface of the frame body 60b of the molds 61 to 64 is used. The heat insulating material 71 is formed to have the same size as the second A platen 42A and the second B platen 42B, and to a predetermined thickness that substantially does not conduct heat between the second A platen 42A and the second B platen 42B. It arrange | positions between the 2nd A platen 42A and the 2nd B platen 42B.
That is, the second platen 42 includes a second A platen 42A that heats the first non-treading mold 65, a second B platen 42B that heats the second tread mold 62, and a second A platen 42A and a second B platen 42B. A heat insulating material 71 disposed therebetween is configured as a stacked structure.

Further, the third platen 43 in the first embodiment is divided into a third A platen 43A that heats the second non-treading surface mold 66 and a third B platen 43B that heats the third tread surface mold 63, and the third A platen 43A A heat insulating means is disposed between the third B platen 43B and a single structure. A heat insulating material 71 is disposed in the heat insulating means.
The third A platen 43A and the third B platen 43B are made of, for example, a flat metal plate having the same size and half the thickness as the third platen 43 used in the first embodiment. A plurality of extending channels 47A and 47B are provided in the width direction.
The heat insulating material 71 is made of the same material as the heat insulating material 70 used on the upper surface of the frame body 60b of the first tread surface mold 61 to the fourth tread surface mold 64. The heat insulating material 71 is formed to have the same size as the third A platen 43A and the third B platen 43B and a predetermined thickness that does not substantially transfer heat between the third A platen 43A and the third B platen 43B. Arranged between the third A platen 43A and the third B platen 43B.
That is, the third platen 43 includes a third A platen 43A that heats the second non-treading mold 66, a third B platen 43B that heats the third tread mold 63, and a third A platen 43A and a third B platen 43B. A heat insulating material 71 disposed therebetween is configured as a stacked structure.

Further, the fourth platen 44 in the first embodiment is divided into a fourth A platen 44A for heating the third non-treading surface mold 67 and a fourth B platen 44B for heating the fourth treading surface mold 64, and the fourth A platen 44A A heat insulating means is disposed between the fourth B platen 44B and a single structure. A heat insulating material 71 is disposed in the heat insulating means.
The fourth A platen 44A and the fourth B platen 44B are made of, for example, a flat metal plate having the same size and half the thickness as the fourth platen 44 used in the first embodiment. A plurality of extending channels 47A and 47B are provided in the width direction.
The heat insulating material 71 is made of the same material as the heat insulating material 70 used on the upper surface of the frame body 60b of the first tread surface mold 61 to the fourth tread surface mold 64. The heat insulating material 71 is formed to have the same size as the 4A platen 44A and the 4B platen 44B and a predetermined thickness that does not substantially transfer heat between the 4A platen 44A and the 4B platen 44B. It is disposed between the fourth A platen 44A and the fourth B platen 44B.
That is, the fourth platen 44 includes a fourth A platen 44A that heats the third non-treading mold 67, a fourth B platen 44B that heats the fourth tread mold 64, a fourth A platen 44A, and a fourth B platen 44B. A heat insulating material 71 disposed therebetween is configured as a stacked structure.
That is, the second A platen 42A, the third A platen 43A, and the fourth A platen 44A constitute a second heating means, and the second B platen 42B, the third B platen 43B, and the fourth B platen 44B are the first. Constitutes a heating means;
The second platen 42 to the fourth platen 44 configured as described above are respectively held by the platen frames 52 to 54 as in the first embodiment.
Note that the heat insulating means may be replaced with the heat insulating material 71 so as to provide a gap, and the platen for heating the tread mold and the platen for heating the non-tread mold may be configured so as not to contact each other.
As a method of providing a gap between the platen for heating the tread mold and the platen for heating the non-tread mold, for example, when the platen 42 is used, heat conduction is performed between the second A platen 42A and the second B platen 42B. The frame body may be configured to have a desired thickness with a low material, and may be configured as one structure so as to be provided between the second A platen 42A and the second B platen 42B. Alternatively, when the tread 11 is formed by the pressing device 3 so that the second A platen 42A and the second B platen 42B are not formed as one structure, but are attached to the platen frames and moved on the rail 25 of the frame 2, respectively. In addition, a stopper mechanism may be provided on the rail 25 so that a gap is formed between the second A platen 42A and the second B platen 42B.

According to the tread manufacturing apparatus 1 having the above-described configuration, for example, the second platen 42 is divided into the second A platen 42A and the second B platen 42B, and the heat insulating material 71 is disposed between the second platen 42A and the second B platen 42B. Since the second tread mold 62 can be individually heated, the tread 11 heated by the first tread mold 61 and the first non-tread mold 65, the second tread mold 62, and the second non-tread mold. Since the tread 11 heated by the mold 66 is individually heated, in addition to the effect of the first embodiment, there is no difference in the progress of vulcanization with the tread 11 that is simultaneously vulcanized and molded.
This effect can be similarly obtained in the relationship between the second platen 42 and the third platen 43 and between the third platen 43 and the fourth platen 44.

Embodiment 3
In the second embodiment, it has been described that the steam supplied from the heat supply unit is shared and the steam at the common temperature is supplied from the first platen 41 to the fifth platen 45. However, the steam at a different temperature for each platen is used. You may make it supply.
That is, the temperature is applied to the flow path 47B of the first platen 41, the second B platen 42B, the third B platen 43B, and the fourth B platen 44B as the first heating means for heating the first tread mold 61 to the fourth tread mold 64. The second A platen 42A, the third A platen 43A, the fourth A platen 44A, and the fifth platen 45 for supplying low steam and heating the first non-treading surface mold 65 to the fourth non-treading surface mold 68 as the second heating means. Steam that is higher in temperature than the steam supplied to the flow path 47B of the platens 41, 42B, 43B, and 44B that heat the first tread mold 61 to the fourth tread mold 64 is supplied to the flow path 47A. It ’s fine.

Specifically, the heat supply means supplies the steam generator and the steam supplied from the steam generator to the first platen 41, the second B platen 42B, the third B platen 43B, and the fourth B platen 44B via the cooling body. Low temperature piping, high temperature piping for directly supplying the steam supplied from the steam generator to the second A platen 42A, the third A platen 43A, the fourth A platen 44A, and the fifth platen 45, and recovery for recovering the steam from all the platens What is necessary is just to supply the vapor | steam of different temperature by platen by comprising with piping.
The cooling body is provided, for example, in the middle of the piping, and includes an expansion chamber in which steam expands and a plurality of cooling fins provided outside the expansion chamber. Therefore, the steam passing through the cooling body is cooled by expanding in the expansion chamber. The cooling efficiency of the cooling body is such that the first platen 41, the second B platen 42B, the third B platen 43B, the fourth B platen 44B, the second A platen 42A, the third A platen 43A, the fourth A platen 44A, the fifth platen 45, What is necessary is just to set suitably by the temperature difference set when heating this.
The tread 11 that is vulcanized and molded as described above is manufactured in a state where the non-tread surface 11b is more vulcanized than the tread surface 11a. Therefore, the tread 11 is vulcanized again in a later process in which the tread 11 and the base tire are integrated. It is possible to prevent the tread surface 11a of the tread 11 from being overvulcanized more than the non-tread surface 11b.

Embodiment 4
In the third embodiment, the flow paths of the first platen 41, the second B platen 42B, the third B platen 43B, and the fourth B platen 44B as first heating means for heating the first tread mold 61 to the fourth tread mold 64 are described. The second A platen 42A, the third A platen 43A, the fourth A platen 44A, the second non-tread surface die 65 to the fourth non-tread surface die 68 as second heating means are heated by supplying low temperature steam to 47B. Steam having a temperature higher than the steam supplied to the flow path 47B of the platens 41, 42B, 43B, and 44B for heating the first tread mold 61 to the fourth tread mold 64 is supplied to the flow path 47A of the 5 platen 45. As described above, the first platen 41, the second B platen 42B, the third B platen 43B, the first platen 41 as the first heating means for heating the first tread mold 61 to the fourth tread mold 64 are provided. A high temperature steam is supplied to the flow path 47B of the B platen 44B to heat the first non-treading surface mold 65 to the fourth non-treading surface mold 68 as the second heating means, the second A platen 42A, the third A platen 43A, Than the steam supplied to the flow path 47B of the platens 41, 42B, 43B, and 44B for heating the first tread mold 61 to the fourth tread mold 64 in the flow path 47A of the fourth A platen 44A and the fifth platen 45. Low temperature steam may be supplied.

Specifically, the heat supply means supplies the steam generator and the steam supplied from the steam generator to the second A platen 42A, the third A platen 43A, the fourth A platen 44A, and the fifth platen 45 through the cooling body. Low temperature piping, high temperature piping that directly supplies steam supplied from the steam generator to the first platen 41, the second B platen 42B, the third B platen 43B, and the fourth B platen 44B, and recovery for recovering steam from all the platens What is necessary is just to supply the vapor | steam of different temperature with a platen by comprising by piping.
The cooling body is provided, for example, in the middle of the piping, and includes an expansion chamber in which steam expands and a plurality of cooling fins provided outside the expansion chamber. Therefore, the steam passing through the cooling body is cooled by expanding in the expansion chamber. The cooling efficiency of the cooling body is such that the first platen 41, the second B platen 42B, the third B platen 43B, the fourth B platen 44B, the second A platen 42A, the third A platen 43A, the fourth A platen 44A, the fifth platen 45, What is necessary is just to set suitably by the temperature difference set when heating this.
The tread 11 that is vulcanized and molded as described above is manufactured in a state where the tread 11a is more vulcanized than the non-tread 11b. Therefore, the tread 11 is vulcanized again in a later process in which the tread 11 and the base tire are integrated. When this is done, the non-tread surface 11b of the tread 11 is well bonded to the base tire.
The first platen 41, the second A platen 42A and the second B platen 42B of the second platen 42, the third A platen 43A and the third B platen 43B of the third platen 43, and the fourth A platen 44A and the fourth B of the fourth platen 44. The temperatures of the steam supplied to the platen 44B and the fifth platen 45 may be appropriately set to different temperatures to vulcanize the tread 11.

In the first to fourth embodiments, the heat insulating material 70 is described as being provided on the flat portion 60d of the tread dies 61 to 64. However, the flat surface 60d is not formed on the tread dies 61 to 64. Even if the heat insulating material 70 is arranged at the contact portions of the non-treading surface molds 65 to 68 that are in contact with the molds 61 to 64, the same effects as those shown in the above embodiments can be obtained.
Further, although it has been described that the tread dies 61 to 64 are fixed to the upper surfaces of the platens 41 to 44 and the non-tread dies 65 to 68 are respectively fixed to the lower surfaces of the platens 42 to 45, the tread dies 61 to 64 are fixed. The non-tread surface molds 65 to 68 may be fixed to the lower surfaces of the platens 42 to 45, respectively, and the upper surfaces of the platens 41 to 44, respectively. In particular, in the second to fourth embodiments, the upper and lower positions where the pair of molds including the tread mold and the non-tread mold are fixed to the upper and lower surfaces of the platen are arbitrarily overlapped. May be. Furthermore, in Embodiment 3 and Embodiment 4, you may set so that the mold which shape | molds a tread of a different kind may overlap.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the above embodiment.

1 tread manufacturing equipment, 2 frames, 3 press equipment, 4 vulcanizing equipment,
6 Molding device, 11 tread, 11a tread, 11b non-tread,
21A to 21D Post, 22 Intermediate beam, 23 Upper beam, 24 Top plate, 24a Lower surface,
25 rail, 31 hydraulic cylinder, 31A piston, 31a upper end surface,
32 Hydraulic control valve, 33 Hydraulic pump,
34A upper press stand, 34B lower press stand, 35:36 hydraulic hose,
41-45 platen, 42A 2A platen, 42B 2B platen,
43A 3A platen, 43B 3B platen, 44A 4A platen,
44B 4B platen, 46 heat supply means, 46A supply port, 46B recovery port,
47 flow path, 48 supply pipe, 49 recovery pipe, 50 supply coupler, 51 recovery coupler,
52-54 platen frame, 55A, 55B holding frame, 56A, 56B wheels,
60a molding surface, 60b frame, 60c molding space, 60d flat surface,
61-64 tread mold, 65-68 non-tread mold, 70 heat insulating material, 71 heat insulating material.

Claims (6)

A tread mold having a molding surface for molding the tread surface, and a mold having a molding space closed by a non-tread mold for molding a non-tread surface opposite to the tread surface;
First heating means for heating the tread mold;
A second heating means for heating the non-tread mold,
A tread manufacturing apparatus for vulcanizing and molding an unvulcanized tread disposed in the molding space,
The tread manufacturing apparatus, wherein the temperature of the tread heated by the first heating means is set to be different from the temperature of the non-tread heated by the second heating means.   2. The tread manufacturing apparatus according to claim 1, wherein the tread mold and the non-tread mold are closed via a heat insulating material disposed on a contact surface of the tread mold. The tread mold has a flat surface surrounding the molding surface;
The tread manufacturing apparatus according to claim 2, wherein the heat insulating material is disposed on the flat surface. A tread manufacturing apparatus in which the mold according to any one of claims 1 to 3 is superimposed in a vertical direction,
The first heating means and the second heating means located between the molds adjacent in the vertical direction are arranged spaced apart in the vertical direction via the heat insulating means,
Of the first heating means and the second heating means that are spaced apart in the vertical direction, the lower second heating means has the non-treading mold on the lower surface, and the upper first heating means on the upper surface. A tread manufacturing apparatus comprising the tread mold.   The tread manufacturing apparatus according to claim 4, wherein the heat insulating means is a heat insulating material.   The tread manufacturing apparatus according to claim 4, wherein the heat insulating means is a gap.

Images