A method of cure control

Abstract

The present application relates to the field of tire mold, disclose a kind of vulcanization control method, by designing a new structure vulcanizing machine, let mold not be extruded damage in actual production process, prolong the service life of mold, guarantee mold production accuracy;While can guarantee not to produce rubber edge, also can effectively protect vulcanizing machine.

Description

Technical Field

[0001] This invention relates to the field of tire molds, and more specifically to a vulcanization control method. Background Technology

[0002] In the design and processing of tire molds, due to the high complexity of the tread pattern, the mold generally adopts a movable tread block structure. The tread blocks are generally made of forged steel and aluminum alloy, while the side plates are generally made of forged steel. During mold processing, the tread blocks are cut into n pieces, where n can be 8, 9, 10, etc.

[0003] When using the mold, it is pre-assembled into the corresponding model mold sleeve, and finally assembled onto the vulcanizing machine. Under the action of the vulcanizing machine's clamping force, the mold is rounded.

[0004] The hot plate on the vulcanizing machine will deform to a certain extent due to long-term use, so it is necessary to add a gasket to the outer ring of the mold sleeve to offset the deformation.

[0005] Because the patterned blocks are subjected to clamping force during use, the amount of shims directly affects the clamping force when the mold closes. If the amount of shims is large, the clamping force of the mold will be large when the mold closes, which will directly cause wear and deformation problems on the vertical surface of the patterned block's partition joint; if the amount of shims is insufficient, the clamping force of the mold will be small when the mold closes, which will cause the mold to not close properly and the product to have glue edge problems.

[0006] When a problem occurs, the machine will be stopped on-site to check for countermeasures, and the gaskets will be readjusted according to the actual situation; the workload is heavy and seriously affects production efficiency.

[0007] In the prior art, patent CN104985727A discloses a control method for automatic mold adjustment of a hydraulic vulcanizing machine. The problem it solves is the automatic adjustment method for the mold loading height of the vulcanizing machine when changing different models of molds. However, it cannot solve the preloading problem of different vulcanizing machines, nor can it solve the problems of mold damage and tire rubber edge.

[0008] The existing technology has the following drawbacks, summarized below:

[0009] The amount of deformation varies from vulcanizing machine to vulcanizing machine. It is impossible to quickly and accurately obtain the amount of deformation during installation, and it is impossible to scientifically adjust the preload (gasket amount). The amount of deformation of a single vulcanizing machine also changes with the number of uses.

[0010] The amount of shims directly affects the appearance quality of the tires produced by the mold and the precision of the mold. When the amount of shims is inappropriate, product defects will occur, requiring heavy workload to rectify and affecting production efficiency. When the amount of shims is larger than actually needed, the mold will be severely damaged, seriously affecting the mold's lifespan. When the amount of shims is smaller than actually needed, tires will have appearance quality problems such as rubber edges. Summary of the Invention

[0011] To address the aforementioned technical problems, this invention provides a vulcanization control method.

[0012] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0013] A vulcanization control method, wherein a mold is assembled inside a vulcanizing machine, the mold includes a mold sleeve, side plates, and patterned blocks, and the patterned blocks are spliced ​​together to form a ring when closed, and the side plates are located at the upper and lower parts of the ring spliced ​​by the patterned blocks;

[0014] The vulcanizing machine includes a vulcanizing machine hydraulic station, a hydraulic cylinder, and pipelines connecting the vulcanizing machine hydraulic station and the hydraulic cylinder. When the pressure inside the hydraulic cylinder increases, the pressure between each patterned block and between the patterned block and the side plate increases. When the pressure inside the hydraulic cylinder decreases, the pressure between each patterned block and between the patterned block and the side plate decreases.

[0015] The vulcanizing machine also includes a force sensor, a control unit, and pressure-boosting and pressure-relief valves installed on the pipeline; the force sensor is connected to the control unit by signal, and the control unit is connected to the pressure-boosting and pressure-relief valves by signal; the pressure-boosting valve controls the increase of pressure in the hydraulic cylinder, and the pressure-relief valve controls the decrease of pressure in the hydraulic cylinder;

[0016] Force sensors are installed on the mating surfaces of the patterned block and the side plate, as well as on the mating surfaces of the patterned block and adjacent patterned blocks.

[0017] Control methods include:

[0018] The tire blank is inserted into the cavity formed by the ring and the side plate, and the mold is closed.

[0019] The control unit is set with pressure threshold one and pressure threshold two, where pressure threshold two is greater than pressure threshold one.

[0020] During mold preloading, the average pressure value of all force sensors is calculated. When the average pressure value is less than pressure threshold one, the pressure valve is opened to increase the pressure in the hydraulic cylinder. When the average pressure value reaches pressure threshold one, the pressure valve is closed. When the average pressure value is greater than pressure threshold two, the pressure relief valve is opened to reduce the pressure in the hydraulic cylinder. When the average pressure value reaches pressure threshold two, the pressure relief valve is closed.

[0021] Furthermore, the mold also includes an arc-shaped seat, a mold sleeve that engages with the arc-shaped seat via a conical surface, and an upper ring on the upper part of the mold sleeve; a patterned block is mounted on the arc-shaped seat; and the piston rod of the hydraulic cylinder is pressed onto the upper ring of the mold sleeve.

[0022] Furthermore, the force sensor includes force sensor one, force sensor two, and force sensor three; the side plate includes an upper side plate located at the top and a lower side plate located at the bottom; force sensor one is located on the mating surface between each patterned block and the upper side plate, force sensor two is located on the mating surface between each patterned block and other patterned blocks, and force sensor three is located on the mating surface between each patterned block and the lower side plate.

[0023] Compared with the prior art, the beneficial technical effects of the present invention are:

[0024] This invention designs a new structure for a vulcanizing machine that prevents molds from being damaged by compression during actual production, extends mold life, and ensures mold production accuracy. At the same time, it can prevent the formation of glue edges and effectively protect the vulcanizing machine. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the vulcanizing machine structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the vulcanization control method of the present invention;

[0027] Figure 3 This is a layout diagram of the force sensor of the present invention;

[0028] Figure 4 This is a layout diagram of the force sensor of the present invention;

[0029] Figure 5 This is a layout diagram of the force sensor of the present invention;

[0030] Figure 6 This is a schematic diagram of the mounting holes on the patterned block of the present invention;

[0031] Figure 7 This is a schematic diagram of the sensing probe of the force sensor of the present invention;

[0032] Figure 8 This is a schematic diagram showing the signal from the force sensor of the present invention being collected by a signal transmitter;

[0033] Figure 9 This is a schematic diagram of the structure of a vulcanizing machine and mold in the prior art;

[0034] Figure 10 This is a schematic diagram of the structure of the hot plate, gasket, and mold in the prior art;

[0035] Figure 11 This is a schematic diagram of the structure of a mold in the prior art. Detailed Implementation

[0036] A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0037] like Figures 9 to 11 As shown, the conventional structure of a vulcanizing machine includes a vulcanizing machine hydraulic station, a vulcanizing machine clamping force hydraulic cylinder d1, a mold sleeve upper cover d2, and an upper hot plate d3. Due to prolonged use, the upper hot plate will deform to a certain extent, so a shim T1 needs to be added to the upper ring d4 of the mold sleeve to offset the deformation T. P is the clamping force applied to the upper ring of the mold sleeve, and P1 is the radial component of P. The conventional structure of the mold includes an upper ring d4 of the mold sleeve, a mold sleeve d5, an arched seat d6, a patterned block d7, an upper side plate d8, and a lower side plate d9. The mating surface between the upper side plate and the upper parting surface of the patterned block is denoted as f1, and the mating surface between the lower side plate and the lower parting surface of the patterned block is f2. g1 to g8 are the mating clearances between the patterned blocks.

[0038] The patterned block is installed inside the bow-shaped seat. The mold sleeve and the outer side of the bow-shaped seat are engaged by a conical surface. When the mold sleeve moves downward, the bow-shaped seat drives the patterned block to move inward, increasing the pressure between the patterned block and the side plate, and between the patterned block and the adjacent patterned block.

[0039] The upper heating plate serves as the base for mounting the mold sleeve and is used to transfer heat and apply clamping force.

[0040] like Figure 1 As shown, in this invention, a hydraulic cylinder a, pipeline, pressure valve, pressure relief valve, and force sensor are added to the conventional structure of a vulcanizing machine.

[0041] The hydraulic cylinder is connected to the hydraulic station of the vulcanizing machine via pipelines, which are equipped with pressure-increasing valves and pressure-reducing valves. The pressure-increasing valve increases the pressure in the hydraulic cylinder, causing the piston rod a1 to extend; the pressure-reducing valve decreases the pressure in the hydraulic cylinder, causing the piston rod to retract. When the piston rod extends, it presses down on the upper ring and the mold sleeve, thereby increasing the pressure between the patterned block and the side plate, and between the patterned block and adjacent patterned blocks.

[0042] like Figure 3 , Figure 4 , Figure 5 As shown, the force sensors include force sensor one C1, force sensor two C2, and force sensor three C3. Force sensor one C1 and force sensor three C3 are respectively installed on the mating surfaces of the patterned block d7 and the upper side plate d8 and lower side plate d9. Two symmetrical patterned blocks in a set of molds are selected to arrange the force sensors. Each patterned block has one set of force sensors. Each set of force sensors includes one force sensor one, one force sensor two, and one force sensor three. A total of two sets of force sensors are needed for these two symmetrical patterned blocks.

[0043] The force sensor must withstand a temperature of at least 200℃. Mounting holes are provided on the upper parting surface, lower parting surface, and side of the patterned block. The force sensor is installed within the mounting hole d71. The sensing probe of the force sensor needs to protrude from the parting surface by a distance P = 3mm; no other part of the force sensor should protrude from the parting surface. The force sensor signal is collected by a signal transmitter S installed on the back of the patterned block. The signal transmitter S uses Bluetooth signal transmission mode, and each Bluetooth signal has a unique code. A Bluetooth signal receiving module matched with the signal transmitter S is installed on the vulcanizing machine.

[0044] The force sensor's force value setting range is 90MPa to 100MPa.

[0045] The control unit in this invention is a vulcanizing machine control cabinet.

[0046] The vulcanization control method includes the following steps:

[0047] The mold containing the force sensor is bolted onto the vulcanizing machine;

[0048] Connect the force sensor quick-connect connector to the vulcanizing machine control cabinet;

[0049] In the control panel of the vulcanizing machine control cabinet, set the static pressure value range of the parting surface to 90MPa~100MPa, that is, the first pressure threshold is 90MPa and the second pressure threshold is 100MPa.

[0050] Preheating and vulcanizing in a vulcanizing machine;

[0051] The vulcanizing machine is loaded with the tire blank, the mold is closed, and the tread blocks close under the action of the mold closing force. When the mold cavity reaches the design height, the tread blocks stop moving.

[0052] The force sensor transmits the force signal to the controller, which compares it with the set value. When the average pressure is below 90MPa, the pressure valve opens, the hydraulic cylinder piston moves downward, pushing the die sleeve downward. Under the action of the conical surface, the pattern block is further pushed to close. When the average pressure reaches 90MPa, the pressure valve closes, and the preload of the die sleeve is locked.

[0053] When the average pressure is greater than 100MPa, the pressure relief valve is opened to release pressure. At this time, the hydraulic cylinder piston moves upward and the pattern block moves slowly outward. When the average pressure reaches 100MPa, the pressure relief valve closes, and the preload of the mold sleeve is locked.

[0054] In this invention, the pressure between the molds can be automatically adjusted without frequent checks of the tire's appearance during the adjustment process, thus preventing the generation of defective products and achieving high efficiency in one step. It can also acquire the actual parameters of the mold during mold closing in real time, enabling scientific pre-loading adjustment. Furthermore, it can effectively protect the mold, preventing mold compression damage, extending mold life, and reducing production costs.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A vulcanization control method, wherein a mold is assembled inside a vulcanizing machine, the mold comprising a mold sleeve, side plates, and patterned blocks, wherein the patterned blocks are joined together to form a ring when closed, and the side plates are located at the upper and lower parts of the ring formed by the patterned blocks; characterized in that: The vulcanizing machine includes a vulcanizing machine hydraulic station, a hydraulic cylinder, and pipelines connecting the vulcanizing machine hydraulic station and the hydraulic cylinder. When the pressure inside the hydraulic cylinder increases, the pressure between each patterned block and between the patterned block and the side plate increases. When the pressure inside the hydraulic cylinder decreases, the pressure between each patterned block and between the patterned block and the side plate decreases. The vulcanizing machine also includes a force sensor, a control unit, and pressure-boosting and pressure-relief valves installed on the pipeline; the force sensor is connected to the control unit by signal, and the control unit is connected to the pressure-boosting and pressure-relief valves by signal; the pressure-boosting valve controls the increase of pressure in the hydraulic cylinder, and the pressure-relief valve controls the decrease of pressure in the hydraulic cylinder; Force sensors are installed on the mating surfaces of the patterned block and the side plate, as well as on the mating surfaces of the patterned block and adjacent patterned blocks. Control methods include: The tire blank is inserted into the cavity formed by the ring and the side plate, and the mold is closed. The control unit is set with pressure threshold one and pressure threshold two, where pressure threshold two is greater than pressure threshold one. During mold preloading, the average pressure value of all force sensors is calculated. When the average pressure value is less than pressure threshold one, the pressure valve is opened to increase the pressure in the hydraulic cylinder. When the average pressure value reaches pressure threshold one, the pressure valve is closed. When the average pressure value is greater than pressure threshold two, the pressure relief valve is opened to reduce the pressure in the hydraulic cylinder. When the average pressure value reaches pressure threshold two, the pressure relief valve is closed. The force sensor includes force sensor one, force sensor two, and force sensor three; the side plate includes an upper side plate located at the top and a lower side plate located at the bottom; force sensor one is located on the mating surface between each patterned block and the upper side plate, force sensor two is located on the mating surface between each patterned block and other patterned blocks, and force sensor three is located on the mating surface between each patterned block and the lower side plate.

2. The vulcanization control method according to claim 1, characterized in that: The mold also includes an arc-shaped seat, a mold sleeve that engages with the arc-shaped seat via a conical surface, and an upper ring on the upper part of the mold sleeve; a patterned block is mounted on the arc-shaped seat; and the piston rod of the hydraulic cylinder is pressed onto the upper ring of the mold sleeve.

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