JP5550360B2 - Bladder or bladder molded article outer diameter control device, and bladder molded article manufacturing method - Google Patents

Description

  The present invention relates to a bladder that is expanded by a gas supplied to the inside, or a bladder or an outer diameter control device for a bladder molded product that controls the outer diameter of a molded product (bladder molded product) molded by the expanded bladder, and bladder molding. The present invention relates to a method for manufacturing a product.

  Conventionally, various bladder moldings such as rubber moldings for tires and air springs are molded using a bladder that expands by gas in the manufacturing process. For example, an unvulcanized tire is formed by folding a tire constituent member around a bead core with an expanding bladder. In addition, the rubber spring, which is a component part of the air spring, is vulcanized by being pressed against the inner surface of the vulcanization mold by an expanded bladder (see Patent Document 1).

  By the way, at the time of vulcanization molding of such a rubber molded product for an air spring, the bladder is expanded in the rubber molded product in the middle of molding composed of a cylindrical unvulcanized rubber member before being stored in the vulcanized mold. Thus, the rubber molding may be bulged and deformed to some extent in advance. As a result, the rubber molded product is stored in the vulcanization mold in a state in which the shape is adjusted, the rubber molded product is evenly contacted with the vulcanization mold, and the air remaining between the vulcanization mold or the bladder and the rubber molded product is obtained. Is suppressed, and the rubber molding is stably vulcanized.

  However, there is a concern that the air spring may be sandwiched between the mating surfaces of the split molds constituting the vulcanization mold when the outer diameter of the rubber molding to be molded is greatly expanded and deformed. On the other hand, if the rubber molded product is bulged and deformed with a small outer diameter, there is a risk of problems with air residue and surface shape, and there is a greater risk of vulcanization being insufficient due to the formation of a portion that does not come into contact with the vulcanization mold. . Therefore, it is necessary for the air spring to bulge and deform the rubber molded product accurately and repeatedly with a set outer diameter. Also, bladder molded products other than rubber molded products for air springs, and bladders that mold them must also be expanded to a predetermined outer diameter to manage the outer diameter, without complicated control. It is required to ensure the accuracy of the outer diameter.

JP 2000-52348 A

  The present invention has been made in view of such problems, and its purpose is to accurately control the outer diameter of an inflated bladder and a bladder molded product formed by an inflated bladder without complicated control. Thus, a predetermined outer diameter is stably secured.

The present invention comprises a bladder and a gas supply means for supplying a gas into the bladder to expand the bladder, and controls the outer diameter of the expanded bladder or the outer diameter of the bladder molded product formed by the expanded bladder. An apparatus for controlling the outer diameter of a bladder molded product, the pressure control means for controlling the supply pressure of gas supplied from the gas supply means to fill the bladder with a predetermined sealing pressure, and the gas sealed in the bladder Based on the result of the comparison of the enclosed amount, the enclosed amount measuring means for measuring the enclosed amount of the gas, the enclosed amount comparing means for comparing the measured value of the enclosed amount of gas with the target value, and changing the gas enclosure pressure by the pressure control means And an amount adjustment means for adjusting the amount of gas enclosed in the bladder to a target value, an outer diameter measurement means for measuring the outer diameter of the expanded bladder or bladder molding, and a measured value and a target value of the outer diameter. With outer diameter comparison means to compare Based on the comparison result of the outer diameter, by changing the filling pressure of the gas by the pressure control means, characterized by comprising an outer diameter adjusting means for adjusting the outer diameter of the bladder or the bladder molded product target value.
The present invention is also a method for manufacturing a bladder molded product by manufacturing a bladder molded product with a bladder that expands with a gas supplied to the inside, and the gas is supplied into the bladder and sealed at a predetermined sealing pressure. Based on the comparison result of the process, the step of measuring the amount of gas sealed in the bladder, the step of comparing the measured value of the gas sealed amount with the target value, and the sealing result of the gas in the bladder And adjusting the gas filling amount in the bladder to the target value and controlling the outer diameter of the expanded bladder or the outer diameter of the bladder molding formed by the expanded bladder according to the gas filling amount. Based on the comparison result of the process, the process of measuring the outer diameter of the expanded bladder or bladder molding, the process of comparing the measured value of the outer diameter and the target value, and the sealed result of the gas in the bladder Change the bladder or bladder molding And adjusting the outer diameter to the target value, that it has a characterized.

  According to the present invention, it is possible to accurately control the outer diameter of the inflated bladder or the bladder molded product formed by the inflated bladder, without complicated control, and to ensure a predetermined outer diameter stably. it can.

It is principal part sectional drawing which shows the vulcanization molding apparatus of the rubber molding for air springs of this embodiment. It is principal part sectional drawing which shows the state by which the vulcanization molding apparatus of FIG. 1 was closed. It is principal part sectional drawing which shows typically the process in which a rubber molding is shape | molded with the bladder which expand | swells. It is principal part sectional drawing which shows typically the process in which a rubber molding is shape | molded with the bladder which expand | swells. It is a block diagram which shows schematic structure of the outer diameter control apparatus of this embodiment. It is a functional block diagram which shows schematic structure of PLC. It is a flowchart which shows the procedure of the outer diameter control process of the rubber molding by the outer diameter control apparatus of this embodiment.

Hereinafter, an embodiment of a bladder or an outer diameter control device for a bladder molded product (hereinafter referred to as an outer diameter control device) and a method for manufacturing a bladder molded product according to the present invention will be described with reference to the drawings.
The outer diameter control device of the present embodiment is configured such that when the bladder molding is molded into a predetermined shape by the expanding bladder, the outer diameter of the expanded bladder or the outer diameter of the bladder molding molded by the expanded bladder is used. To control. Note that the bladder molded product is a molded product that is formed into a predetermined shape by being deformed in whole or in part by gradually expanding or expanding as the bladder expands. In this embodiment, in the vulcanization molding process of a rubber molded product for an air spring (hereinafter referred to as a rubber molded product), a rubber molded product in the middle of molding composed of a cylindrical unvulcanized rubber member is bulged and deformed by a bladder. The case where a rubber molding is molded as the bladder molding will be described as an example.

FIG. 1 is a cross-sectional view schematically showing a main part of a rubber molded product vulcanization molding apparatus (hereinafter referred to as a vulcanization molding apparatus) according to the present embodiment. FIG. 6 is a half cross-sectional view showing one side (left side) across a center line in the left-right direction. FIG. 2 is a cross-sectional view of the main part showing a state where the vulcanization molding apparatus 1 of FIG. 1 is closed.
In the following description of the vulcanization molding apparatus 1, when simply referred to as the circumferential direction, the radial direction, and the center line direction, they are orthogonal to the circumferential direction, radial direction (left-right direction in the figure), and radial direction of the annular vulcanization mold 10, respectively. This means the direction of the center line (vertical direction in the figure).

  The vulcanization molding apparatus 1 includes a vulcanization mold 10 that stores a rubber molding G, and a bladder 20 that is disposed in the rubber molding G in the vulcanization mold 10 as illustrated. Further, the vulcanization molding apparatus 1 includes a gas supply means 30 including a pump or the like that sends out gas (here, air), and supplies a gas as a pressurized medium into the bladder 20 from the gas supply means 30 to expand it, The rubber molding G is bulged and deformed by the bladder 20. The rubber molding G is formed in a cylindrical shape in which an annular bead portion B is provided along the edge of the opening at both ends (upper and lower ends in the figure) by unvulcanized rubber in a pre-process of vulcanization molding, At the time of vulcanization molding, it is transported by a transport device (not shown) and arranged around the bladder 20.

  The bladder 20 is formed in a cylindrical shape that can be expanded and contracted by a heat-resistant or stretchable material such as rubber, and in a contracted state (see FIG. 1), a rubber molded product G before molding is disposed on the outer peripheral side. The The bladder 20 is applied with an internal pressure by the gas from the gas supply means 30 and gradually expands in the rubber molded product G. The bladder 20 abuts on the inner surface thereof to bulge and deform the rubber molded product G. The object G is pressed against the inner surface of the vulcanization mold 10 (see FIG. 2) and pressed with a predetermined pressure. In addition, after the vulcanization molding is completed, the bladder 20 releases the internal gas to release the pressure of the rubber molded product G and contracts to the original state, so that the rubber molded product G after the vulcanization molding is Removed from.

  In addition, the bladder 20 has an annular end portion surrounding the upper and lower openings held in an airtight manner by upper and lower holding members 21 and 22, respectively, and a holding member 21 connected by a connecting member (not shown). The bladder unit is formed by integrating with 22. The holding members 21 and 22 are members that sandwich and fix each end of the T-shaped cross section of the bladder 20 and hold them in a concentric shape, and are formed in a disk shape that is disposed in contact with the vulcanization mold 10. Has been. These holding members 21 and 22 hold the end portions of the bladder 20 at a predetermined interval in the center line direction, and the through holes formed in the lower holding member 22 are connected to the gas supply means 30 so as to pass through. Gas is circulated between the inside and outside of the bladder 20 through the hole. The holding members 21 and 22 each have an annular recess with which the bead portion B of the rubber molded product G is engaged on the upper surface and the lower surface, respectively, and holds the bead portion B that is received and engaged therein, and During vulcanization molding, the bead portion B is sandwiched and held between the vulcanization mold 10.

  The vulcanization mold 10 is an outer mold that defines the outer surface shape of the rubber molded product G. The upper mold 11 and the lower mold 12 that are opposed to each other in the vertical direction are arranged between them, and a plurality of them are arranged in the circumferential direction. And a divided mold (sector mold) 13. The vulcanization mold 10 is configured such that each divided mold 13 can move in the radial direction and can move relatively in a direction in which the upper mold 11 and the lower mold 12 approach and separate from each other.

  The vulcanization molding apparatus 1 includes an open (die opening) position (see FIG. 1) that is separated from each other, and a closed (die closing) position in which the molds 11, 12, and 13 are brought into close contact with each other in a predetermined position (FIG. 2). (See). The vulcanization molding apparatus 1 accommodates the bladder 20 and the rubber molded product G in the vulcanization mold 10 by the movement to the mold closing position, and the cavity K corresponding to the shape of the rubber molded product G in the vulcanization mold 10. The unvulcanized rubber molding G is accommodated therein and vulcanized and molded. At that time, the upper mold 11 and the lower mold 12 respectively mold (mold) the upper and lower end side shapes of the rubber molded product G, and the split mold 13 the outer peripheral surface (side surface) shape of the rubber molded product G. It is formed in a predetermined shape. Therefore, each mold 11, 12, 13 has a concave curved surface corresponding to the shape of each part of the rubber molded product G, and the surface defining the cavity K on the inner surface side of the vulcanization mold 10 is smooth without any difference in level. It is formed on a continuous molding surface. Hereinafter, each part including these molds 11, 12, and 13 will be described in detail.

  The upper mold 11 and the lower mold 12 each have an annular shape, abut against the holding members 21 and 22 of the bladder 20 housed in the vulcanization mold 10, and sandwich them from above and below. Further, the lower mold 12 is attached to the upper surface of the lower plate 2 (for example, the lower platen), and the position in the vulcanization mold 10 is fixed. On the other hand, the upper mold 11 is attached to the lower surface of the upper plate 3 (for example, the upper platen) that can move in the vertical direction above the lower plate 2. The upper plate 3 is moved up and down (lifted and lowered) by a lifting / lowering means (not shown) such as a piston / cylinder mechanism installed vertically above the upper plate 3 to move the upper mold 11 apart and approach the lower mold 12. With this displacement, the vulcanization mold 10 is opened and closed, and the rubber molded product G is stored and taken out.

  The plurality of divided molds 13 each have an arc shape in plan view and are combined in the circumferential direction to form an annular mold as a whole. In addition, each of the split molds 13 is formed with an inclined guide portion 13A for guiding the movement in the radial direction on the back surface on the radially outer side. A cylindrical outer ring 4 is provided on the outer side in the radial direction of the plurality of divided molds 13 so as to be movable in the center line direction so as to move the divided molds 13 in synchronization with the radial direction. Yes.

  The outer ring 4 has an upper end attached to the lower surface of the upper plate 3, and moves up and down with the upper plate 3 in the center line direction. Further, the outer ring 4 is formed such that the inclined surface 4A of the inner peripheral surface is inclined with the same gradient as the inclined guide portion 13A of the split mold 13. A plurality of guide grooves (not shown) are formed on the inclined surface 4A, and each guide groove is connected to a slide rail (not shown) fixed to each inclined guide portion 13A so that they slide in the inclination direction. It is movably engaged. Therefore, when the outer ring 4 moves in the vertical direction, the inclined surface 4A and the inclined guide portion 13A of the divided mold 13 slide along the inclined direction, and the radial inner and outer force is applied to the divided mold 13 from the inclined surface 4A. Act. Thereby, the plurality of divided molds 13 are displaced in the radial direction according to the inclination of the inclined surface 4 </ b> A of the outer ring 4, and move (expand / contract) along the lower guide plate 5 inward or outward in the radial direction. Moreover, after moving to the movement end of the radial direction outer side, the division | segmentation mold 13 is maintained in the state connected with the outer ring 4, and raises with the outer ring 4 integrally (refer FIG. 1).

  The vulcanization molding apparatus 1 surrounds the bladder 20 and the rubber molding G, arranges the upper and lower molds 11 and 12 in the mold closing position (see FIG. 2), and moves the plurality of divided molds 13 inward in the radial direction. Then, the split molds 13 are brought into contact with each other, and the vulcanization mold 10 is closed. Further, the bladder 20 is expanded while pressing the outer ring 4 downward, and the rubber molded product G is heated to press the rubber molded product G against the molding surface of the vulcanizing mold 10 with a predetermined pressure, and the vulcanization molding proceeds. Let After completion of the vulcanization molding, the bladder 20 is contracted, the plurality of divided molds 13 and the upper and lower molds 11 and 12 are separated from each other, and the mold is opened. Take out.

  Here, in this embodiment, before the vulcanization mold 10 is closed and the rubber molded product G is stored in the vulcanization mold 10 (see FIG. 1), the bladder 20 is moved to the middle stage in the rubber molded product G. Inflate. Thus, after the rubber molding G is bulged and deformed to some extent in advance, the vulcanization mold 10 is closed and the rubber molding G is accommodated in the vulcanization mold 10 to further expand the bladder 20 (see FIG. 2). The rubber molded product G is vulcanized and molded as described above. At that time, the rubber molded product G is not sandwiched between the mating surfaces of the molds 11, 12, 13 when the mold is closed, and is in contact with the vulcanization mold 10 evenly, and between the vulcanization mold 10 and the bladder 20. Molding is performed by bulging and deforming to a predetermined state smaller than the cavity K so that no air remains. Further, the outer diameter of the rubber molded product G molded by the expanded bladder 20 is measured by the outer diameter measuring means 40 disposed outside the vulcanization mold 10.

3 and 4 are main part cross-sectional views schematically showing a process of molding the rubber molded product G by the expanding bladder 20, and a part related to the molding of the rubber molded product G is extracted from FIG. Yes.
The outer diameter measuring means 40 includes, for example, a laser displacement sensor that measures the amount of displacement of the object and a distance measuring sensor that measures the distance to the object. As shown in FIG. It is arranged toward (here, the central part in the vertical direction). Further, a pair of outer diameter measuring means 40 are arranged on both the left and right sides (only the left side is shown in the figure) across the rubber molded product G, and the displacement amount and the maximum The distance between the bulging part is measured, and the outer diameter of the part is measured from both the left and right sides.

  At the time of molding the rubber molding G, the vulcanization molding apparatus 1 first causes the bladder 20 (see FIG. 3) to slightly expand with the gas supplied from the gas supply means 30 so as to contact the inner surface of the rubber molding G. The rubber molded product G is positioned and arranged concentrically with the bladder 20. Next, gas is supplied into the bladder 20, the bladder 20 (see FIG. 4) is further expanded, gas is sealed in the bladder 20 at a predetermined sealing pressure, and rubber molding is performed in accordance with the expanded shape of the bladder 20. The object G is bulged and deformed. Thereby, the rubber molded product G is formed into a circular arc shape in cross section here, and its outer diameter is measured by the outer diameter measuring means 40. The vulcanization molding apparatus 1 controls the expansion of the bladder 20 by an outer diameter control device based on the measurement result of the outer diameter by the outer diameter measuring means 40 and the like, and the rubber molded product G molded by the expanded bladder 20 is controlled. Control the outer diameter.

FIG. 5 is a block diagram showing a schematic configuration of the outer diameter control device.
As shown in the figure, the outer diameter control device 50 includes a PLC (programmable logic controller) 60 that is a control unit for controlling the entire device, an input device 51, a pressure control means 52, a gas flow meter 53, and an outer diameter measurement. Means 40. The input device 51 includes, for example, a touch panel connected to the PLC 60, and is used for inputting and operating various data by an operator, and outputs each data of input and operation to the PLC 60. The input device 51 is also used when various data relating to outer diameter control, which will be described later, is set in the PLC 60, and outputs the input setting data to the PLC 60.

  The pressure control means 52 is connected to a gas supply path (pipe) between the gas supply means 30 and the bladder 20 and is an electropneumatic valve (or electropneumatic electromagnetic) that changes the pressure of the gas supplied to the bladder 20 steplessly. A pressure control valve such as a valve). The pressure control means 52 is an internal pressure control controller that operates the pressure control valve to control the internal pressure of the bladder 20, and opens and closes the gas supply path connected to the bladder 20 by opening and closing the pressure control valve. The pressure control means 52 controls and changes the supply pressure of the gas supplied from the gas supply means 30 into the bladder 20 by the pressure control valve, and expands the bladder 20 at each pressure to close the gas supply path. The gas is sealed in the bladder 20 at a predetermined sealing pressure. At that time, the pressure control means 52 supplies and seals the gas at the initial pressure set in the bladder 20 based on the control signal from the connected PLC 60, opens and closes the pressure control valve, etc. The pressure of the gas to be supplied and sealed is changed.

  The gas flow meter 53 is attached in a gas supply path between the pressure control means 52 and the bladder 20, and determines the flow rate of the gas supplied into the bladder 20 (the volume of gas flowing per unit time (volume flow rate)). taking measurement. The gas flow meter 53 continuously measures the gas flow rate when supplying the gas to the bladder 20, and sequentially outputs the measured value of the gas flow rate to the PLC 60. The PLC 60 is also connected with an outer diameter measuring means 40, and the outer diameter measuring means 40 determines the outer diameter of the rubber molded product G at a predetermined timing including when the bladder 20 is expanded and gas of an initial pressure is sealed. Measure and output each measured value to PLC60.

  The PLC 60 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory) that stores various programs for outer diameter control processing, a RAM (Random Access Memory) that temporarily stores data directly accessed by the CPU, and the like. A microcomputer (or CPU unit) having Moreover, PLC60 has each means (functional part) mentioned later which performs the process regarding the outer diameter control of the rubber molding G as a function implementation | achievement means obtained by executing the program stored in ROM by CPU.

FIG. 6 is a functional block diagram showing a schematic configuration of the PLC 60.
As shown in the figure, the PLC 60 includes an input / output unit 61, a storage unit 62, and an outer diameter control processing unit 70 that performs processing for controlling the outer diameter of the rubber molded product G. Are connected to each other. The input / output unit 61 is an interface that is connected to an external device to input / output data, and is connected to the input device 51, the pressure control unit 52, the gas flow meter 53, and the outer diameter measurement unit 40. The storage unit 62 stores various data related to outer diameter control, such as setting conditions for outer diameter control, a measured value of gas flow rate by the gas flow meter 53, and a measured value of outer diameter of the rubber molded product G by the outer diameter measuring means 40. Remember.

  The PLC 60 is preliminarily input with each data related to the outer diameter control from the operator via the input device 51, stores them in the storage unit 62, and the outer diameter control processing unit 70 reads out necessary data from the storage unit 62. To use. The outer diameter control processing unit 70 includes an enclosed amount measuring unit 71, an enclosed amount comparing unit 72, an enclosed amount adjusting unit 73, an outer diameter comparing unit 74, an outer diameter adjusting unit 75, and a pressure setting unit 76. The outer diameter control processing of the rubber molded product G is executed by the means), and the processing result is stored in the storage unit 62. Hereinafter, the outer diameter control device 50 controls the outer diameter of the rubber molded product G molded by the expanded bladder 20, and the outer diameter control device 50 controls the outer diameter of the rubber molded product G. The manufacturing method to manufacture is demonstrated.

FIG. 7 is a flowchart showing the procedure of the outer diameter control process of the rubber molded product G by the outer diameter control device 50.
In the outer diameter control device 50, first, as described above, the rubber molding G before molding is arranged around the bladder 20 (see FIG. 1), and then from the gas supply means 30 based on the control signal from the PLC 60. Gas is supplied through the pressure control means 52 to slightly expand the bladder 20 (see FIG. 3). Subsequently, the pressure control means 52 controls the supply pressure of the gas supplied into the bladder 20 to supply the gas into the bladder 20 to further expand the bladder 20 (see FIG. 4). Gas is sealed at a predetermined sealing pressure corresponding to (S101).

  At that time, the preset initial pressure is output to the pressure control means 52 by the outer diameter control processing unit 70 of the PLC 60, and the gas is gradually supplied from the pressure control means 52 at the initial pressure, and the gas is sealed in the bladder 20. To do. Thereby, the bladder 20 is expanded to a state corresponding to the initial pressure, and the rubber molded product G is bulged and deformed in accordance with the expanded shape of the bladder 20. Further, the gas flow meter 53 sequentially measures the flow rate of the gas supplied into the bladder 20 and outputs it to the PLC 60. Based on the measured value of the flow rate of the gas and the supply time of the gas at each flow rate, the enclosed amount measuring unit 71 calculates the integrated value by integrating the supply amount of the gas through the gas supply to the bladder 20, The amount of gas sealed in the bladder 20 is measured (S102). Subsequently, the measurement value of the gas filling amount measured by the filling amount measuring unit 71 is compared with a preset target value of the gas filling amount by the filling amount comparison unit 72 (S103).

  Next, based on the comparison result between the enclosed amounts by the enclosed amount comparing unit 72, the enclosed amount of the gas in the bladder 20 is adjusted by the enclosed amount adjusting unit 73 (S104). The filling amount adjusting unit 73 controls the supply pressure of the gas supplied into the bladder 20 by the pressure control means 52 based on the comparison result of the filling amounts, and changes the filling pressure of the gas in the bladder 20 by the pressure control means 52. Let At this time, for example, when the measured value of the gas filling amount is smaller than the target value, the gas supply pressure is increased to expand the bladder 20, and the gas filling pressure to the bladder 20 is increased to increase the gas filling amount. To increase. Conversely, when the measured value of the gas filling amount is larger than the target value, the gas supply pressure is lowered to contract the bladder 20, and the gas filling pressure to the bladder 20 is lowered to reduce the gas filling amount. To do. In this way, the filling amount adjusting unit 73 changes the gas filling pressure to the bladder 20 according to the difference between the measured value of the gas filling amount and the target value, and sets the gas filling amount in the bladder 20 as the target. Adjust towards the value.

  Here, like a general balloon, the bladder 20 expands according to the gas supply pressure, and the gas is sealed at the pressure, and between the gas sealing amount and the outer diameter (expansion diameter). As a result, linearity and a predetermined relationship occur, and the outer diameter continuously changes in accordance with the amount of gas enclosed. Therefore, the outer diameter control device 50 adjusts the amount of gas enclosed in the bladder 20 by the PLC 60 and the pressure control means 52 to change the amount of expansion of the bladder 20, and the outside of the expanded bladder 20 is changed by the amount of gas enclosed. The diameter or the outer diameter of the bladder molded product formed by the expanded bladder 20 is controlled. Here, the outer diameter control device 50 measures and changes the outer diameter of the rubber molding G, which is a bladder molding, by measuring the amount of gas sealed by the sealing amount measuring unit 71, and thereby changing the rubber The outer diameter of the molded product G is adjusted toward a preset target value of the outer diameter.

  Also, the outer diameter control device 50 measures and monitors the outer diameter of the bulging and deforming rubber molding G by the outer diameter measuring means 40 (see FIG. 4), and the adjusted outer diameter of the rubber molding G is measured. Measurement is performed (S105), and the measured value of the outer diameter is compared with the target value by the outer diameter comparing unit 74 (S106). Next, based on the comparison result between the measured value of the outer diameter and the target value, the outer diameter adjusting unit 75 changes the gas sealing pressure by the pressure control means 52 to change the bladder 20 or the rubber molded product G (here, rubber molding). The outer diameter of the object G) is adjusted (S107). In addition, as the target value of the outer diameter, a predetermined outer diameter value or an outer diameter value including a predetermined allowable range is set in advance and stored in the storage unit 62.

  Based on the comparison result of the outer diameters, the outer diameter adjusting unit 75 changes the gas sealing pressure in the bladder 20 by changing the gas sealing pressure in the bladder 20 in the same manner as the sealing amount adjusting unit 73, and changes the rubber sealing amount. The outer diameter of the molded product G is adjusted to a target value. At that time, the outer diameter of the rubber molded product G that is deformed toward the set target value of the outer diameter is measured by the outer diameter measuring means 40, and the outer diameter adjusting unit 75 monitors the measured value of the outer diameter while measuring the pressure. The gas sealing pressure by the control means 52 is controlled and changed. Thereby, when the measured value of the outer diameter coincides with the target value, the outer diameter adjusting unit 75 encloses the gas in the bladder 20 by the pressure control means 52 and stops the change in the outer diameter of the rubber molded product G. Further, the outer diameter adjustment unit 75 stores in the storage unit 62 the final sealing pressure in the bladder 20 changed based on the comparison result of the outer diameters, and the final sealing amount of the gas in the bladder 20 measured by the sealing amount measurement unit 71. Remember me.

  Subsequently, the outer diameter control device 50 uses the pressure setting unit 76 based on the final sealed pressure in the bladder 20 to initially seal the gas in the bladder 20 by the pressure control means 52 when the next bladder 20 is expanded. The sealing pressure is set (S108). Here, the pressure setting unit 76 sets a pressure lower than the final sealed pressure by a predetermined pressure as the initial sealed pressure, and ends the outer diameter control process of the rubber molded product G at that time. Next, when the bladder 20 is inflated, gas is first sealed in the bladder 20 at the set initial sealing pressure, and the gas in the bladder 20 is set by the sealing amount comparison unit 72 using the final sealing amount of the previous gas as a target value. Compare with the measured value of the amount of entrapped. As a result, after confirming that the measured value is smaller than the target value, the gas sealing pressure is increased to the last final sealing pressure, and the gas sealing amount of the bladder 20 is adjusted.

  In this manner, the outer diameter control device 50 uses the outer diameter measuring means 40 to adjust the gas filling pressure and the amount of filling at that time, and based on the result, the gas filling is performed when the bladder 20 is expanded. Feedback and control of pressure and quantity of filling are performed. In addition, when the bladder 20 is first inflated, there is a certain degree of validity as a result of experimentally inflating the bladder 20 as a setting condition such as the initial gas filling pressure or the target value of the filling amount, or from past data. If a certain value is set, the difference from the next time onward can be reduced and smooth control can be performed. The outer diameter control device 50 repeats the above steps and sequentially forms the rubber molded product G into a predetermined shape by the bladder 20 that is expanded by the gas supplied to the inside, thereby producing the rubber molded product G. Here, after the rubber molding G is swelled and deformed in a predetermined state, the vulcanization mold 10 (see FIG. 2) is closed as described above, and the bladder 20 is further expanded to form a rubber molding. G is vulcanized. Thereafter, the bladder 20 is shrunk to open the vulcanization mold 10, the vulcanized rubber molding G is taken out, the next rubber molding G is placed around the bladder 20, and the rubber molding G is continuously formed. To manufacture.

  As described above, in the present embodiment, gas is sealed in the bladder 20 at a predetermined sealing pressure, the measured value of the gas sealing amount is compared with the target value, and the gas is calculated based on the comparison result of the sealing amount. The filling amount of gas in the bladder 20 is adjusted to the target value by changing the filling pressure. Therefore, the amount of gas enclosed in the bladder 20 is the outer diameter in which the expanded bladder 20 or the outer diameter of the rubber molded product G molded by the bladder 20 (here, the outer diameter of the rubber molded product G) is set. It can be repeatedly and stably maintained at the target value of the enclosed amount. Along with this, the bladder 20 can be expanded to a predetermined outer diameter and shape corresponding to the target value of the gas filling amount each time the expansion is performed, and the outer diameter of the rubber molded product G can be accurately controlled. G can be molded in a similar state by repeatedly and stably bulging and deforming G. Moreover, in order to measure the gas filling amount that can be measured relatively easily and accurately, and to adjust the gas filling amount in the bladder 20 based on the measurement result, the bladder 20 is accurately inflated to remove the rubber molding G from the outside. Diameter accuracy can be increased. At the same time, the expansion of the bladder 20 can be reliably controlled without complicated control, and high outer diameter accuracy can be easily ensured.

  Therefore, according to the present embodiment, the outer diameter of the rubber molded product G molded by the expanded bladder 20 is accurately controlled without complicated control, and the predetermined outer diameter is stably secured. Can do. Thereby, at the time of vulcanization molding, the rubber molded product G can be stored in the vulcanization mold 10 in a state of being accurately molded to the target outer diameter and shape, so that the rubber molded product G is evenly placed on the vulcanization mold 10. It can also be contacted. As a result, the remaining air between the vulcanization mold 10 or the bladder 20 and the rubber molded product G and the fluctuation of the surface shape of the rubber molded product G are more reliably suppressed, and the rubber molded product G can be stably added. Sulfur molding is possible. In addition, the rubber molding G can be stored in the vulcanization mold 10 without being sandwiched between the mating surfaces of the molds 11, 12, and 13, and the rubber molding G can be heated by contacting the vulcanization mold 10 throughout. Vulcanization and molding can be reliably performed with reduced variations in molding.

  Further, since the outer diameter control of the rubber molded product G can be executed without requiring complicated control, processing, operation, etc., the configuration of the outer diameter control device 50 can be made relatively simple, and the cost of the apparatus can be reduced. Reliability can be improved. Here, the calculation and processing for the outer diameter control, the control of the pressure control means 52, and the signal processing from the outer diameter measuring means 40 and the gas flow meter 53 are performed by one PLC 60 without being dispersed. The versatility of the outer diameter control device 50 is also increased.

  Further, when the bladder 20 is repeatedly inflated, for example, by calculating the slope of the change (differential coefficient) from the amount of gas sealed in the bladder 20 each time by the PLC 60, the change with time of the bladder 20 is grasped. it can. Based on this differential coefficient, the target value of the next gas filling amount at which the outer diameter of the bladder 20 becomes the target value during the next expansion can be set as appropriate, or deterioration of the bladder 20 can be determined early. As described above, the deterioration of the bladder 20 is judged at an early stage based on the data accumulated in the past and the control history, so that a sudden change in the gas filling amount and the overexpansion of the bladder 20 can be prevented in advance, and the gas to the bladder 20 can be prevented. Thus, the rubber molding G can be stably molded to the target outer diameter by appropriately maintaining the amount of the sealing material.

  Here, for example, when the outer diameter of the rubber molded product G is measured only by the outer diameter measuring sensor such as a laser displacement sensor and the gas filling amount is adjusted, the rubber molded product is influenced by the measurement accuracy of the outer diameter measuring sensor. It may be difficult to effectively increase the accuracy of the outer diameter of G. That is, such an outer diameter measurement sensor has a limitation in measurement distance, and the measurement accuracy tends to be low when measuring from a long distance. Measurement is difficult. Therefore, as in the vulcanization molding apparatus 1 (see FIG. 1), it is necessary to install an outer diameter measuring sensor outside the apparatus, and in a situation where the rubber molding G cannot be installed close to the rubber molding G, the rubber molding G is sufficient. Until it bulges and deforms, it is difficult to accurately control the outer diameter by measuring the outer diameter.

  On the other hand, in this embodiment, since the amount of gas enclosed in the bladder 20 is measured to adjust the amount of sealing, each problem in the outer diameter measurement sensor can be avoided, and in various situations, the rubber molded product G The outer diameter can be reliably controlled to improve the accuracy of the outer diameter effectively. In addition, after the rubber molded product G is molded by the bladder 20, the outer diameter of the rubber molded product G is measured by the outer diameter measuring means 40. In this case, the rubber molded product G is externally moved according to the expansion of the bladder 20. Since it is close to the diameter measuring means 40, the outer diameter of the rubber molded product G can be accurately measured. Therefore, based on the comparison result between the measured value of the outer diameter and the target value, the gas sealing pressure in the bladder 20 is changed to adjust the outer diameter of the rubber molded product G to the target value. By controlling the outer diameter more accurately, the accuracy of the outer diameter can be further improved.

  In addition, as described above, if the initial sealing pressure at the time of the next expansion is set based on the final sealing pressure in the bladder 20 changed from the comparison result of the outer diameter, the next initial sealing pressure can be appropriately set. The cycle time until gas filling into the bladder 20 is completed can be shortened. In addition, since the bladder 20 is stretched to some extent as the expansion and contraction are repeated, and the manner of expansion also changes, the bladder 20 is changed by setting the next initial sealing pressure based on the previous final sealing pressure. Appropriate initial sealing pressure corresponding to can be set. Thereby, the bladder 20 can be appropriately expanded for each expansion, and the outer diameter of the rubber molded product G can be controlled with higher accuracy. At that time, once the outer diameter of the rubber molding G becomes larger than the target value, even if the bladder 20 is contracted by lowering the gas sealing pressure, a history of once large deformation remains in the rubber molding G. . Therefore, it is desirable to set a pressure lower than the final sealing pressure as the initial sealing pressure. By doing in this way, first, since the bladder 20 expand | swells with the outer diameter smaller than aim, it can prevent reliably that the outer diameter of the rubber molding G becomes larger than a target value, and the quality of the rubber molding G Can be secured stably.

  In the present embodiment, the example of controlling the outer diameter of the rubber molded product G, which is a bladder molded product, has been described. However, the outer diameter of the expanded bladder 20 itself can also be accurately controlled in the same manner as described above. In this case, the outer diameter of the expanded bladder 20 is directly measured and compared with a target value of the outer diameter, and the outer diameter of the bladder 20 is adjusted toward the target value. Thus, for example, when forming an unvulcanized tire by folding the tire component around the bead core by the expanding bladder 20 in the tire manufacturing process, the tire component is accurately folded to Molding accuracy can be improved.

  However, the rubber molded product G manufactured by the vulcanization molding apparatus 1 is thinner than the tire and has no or no use of a member for reinforcing the inside such as a bead or a wire. Therefore, it is sensitively deformed according to the state and expansion of the bladder 20. Therefore, it is difficult to control the outer diameter of the rubber molded product G, and there is a tendency that variations in the outer diameter and excessive bulging deformation are likely to occur. From the viewpoint, more accurate outer diameter control is required. Therefore, the present invention is suitable for controlling the outer diameter of the rubber molded product G for the air spring that is bulged and deformed by the expanding bladder 20.

  DESCRIPTION OF SYMBOLS 1 ... Vulcanization molding apparatus, 2 ... Lower plate, 3 ... Upper plate, 4 ... Outer ring, 4A ... Inclined surface, 5 ... Lower guide plate, 10 ... Addition Sulfur mold, 11 ... upper mold, 12 ... lower mold, 13 ... divided mold, 13A ... inclined guide part, 20 ... bladder, 21, 22 ... holding member, 30 ... Gas supply means, 40 ... outer diameter measuring means, 50 ... outer diameter control device, 51 ... input device, 52 ... pressure control means, 53 ... gas flow meter, 60 ... PLC, 61 ... Input / output unit, 62 ... Storage unit, 63 ... Bus, 70 ... Outer diameter control processing unit, 71 ... Encapsulated amount measuring unit, 72 ... Encapsulated amount comparing unit 73... Enclosed amount adjustment unit, 74... Outer diameter comparison unit, 75... Outer diameter adjustment unit, 76. ... bead portion, G ... rubber molding, K ... cavity.

Claims (8)

A bladder or a bladder molded article comprising a bladder and a gas supply means for supplying gas into the bladder to expand the bladder, and controlling an outer diameter of the expanded bladder or an outer diameter of the bladder molded article formed by the expanded bladder. An outer diameter control device,
Pressure control means for controlling the supply pressure of the gas supplied from the gas supply means, and sealing the gas at a predetermined sealing pressure in the bladder;
An enclosed amount measuring means for measuring an enclosed amount of gas enclosed in the bladder;
An enclosed amount comparison means for comparing a measured value of the amount of gas enclosed with a target value;
Based on the comparison result of the filled amount, the filled amount adjusting means for adjusting the filled amount of the gas in the bladder to a target value by changing the filled pressure of the gas by the pressure control means,
An outer diameter measuring means for measuring the outer diameter of the expanded bladder or bladder molding;
An outer diameter comparing means for comparing the measured value of the outer diameter with the target value;
Based on the comparison result of the outer diameter, by changing the gas sealing pressure by the pressure control means, the outer diameter adjusting means for adjusting the outer diameter of the bladder or the bladder molding to a target value,
A device for controlling the outer diameter of a bladder or a bladder molded product. In the outer diameter control device of the bladder or the bladder molded product according to claim 1,
A bladder comprising pressure setting means for setting an initial sealing pressure to be sealed in the bladder by the pressure control means at the time of the next bladder expansion based on the final sealing pressure in the bladder changed from the comparison result of the outer diameter, or Bladder molded outer diameter control device. In the outer diameter control device of the bladder or the bladder molded product according to claim 2,
An apparatus for controlling the outer diameter of a bladder or a bladder molded product, wherein the pressure setting means sets a pressure lower than the final sealing pressure to the initial sealing pressure . In the outer diameter control device of the bladder or the bladder molded product according to any one of claims 1 to 3,
Bladder molded product for controlling the outer diameter of the outer diameter control apparatus of the bladder or bladder molding, wherein a rubber molding der Rukoto the air spring which bulges deformed by bladder expands. A method for manufacturing a bladder molding by which a bladder molding is manufactured by a bladder that expands with a gas supplied therein ,
Supplying gas into the bladder and sealing the gas at a predetermined sealing pressure;
Measuring the amount of gas enclosed in the bladder;
A step of comparing the measured value of the gas filling amount with a target value;
Based on the comparison result of the filling amount, the step of adjusting the filling amount of the gas in the bladder to the target value by changing the filling pressure of the gas in the bladder;
A step of controlling the outer diameter of the expanded bladder or the outer diameter of the bladder molded product formed by the expanded bladder, depending on the amount of gas enclosed;
Measuring the outer diameter of the expanded bladder or bladder molding;
Comparing the measured value of the outer diameter with the target value;
Based on the comparison result of the outer diameter, changing the gas sealing pressure in the bladder and adjusting the outer diameter of the bladder or the bladder molding to a target value;
Method for producing a bladder molded product, characterized in Rukoto to have a. Te manufacturing method odor bladder molded product according to claim 5,
A method for manufacturing a bladder molded product comprising a step of setting an initial sealing pressure to be sealed in a bladder at the time of the next bladder expansion based on a final sealing pressure in the bladder changed from a comparison result of outer diameters . In the method for producing a bladder molded product according to claim 6,
A method for producing a bladder molded product, wherein the step of setting an initial sealing pressure sets a pressure lower than the final sealing pressure as an initial sealing pressure . In the method for producing a bladder molded product according to any one of claims 5 to 7,
Method for producing a bladder molded product for controlling the outer diameter, bladder molding, wherein a rubber molding der Rukoto the air spring which bulges deformed by bladder expands.

Images