Tire relief mold

Abstract

The utility model discloses a kind of tire active die, belong to tire active die technical field, including upper cover, upper slider, slider, guide bar, guide ring, base, upper cover and upper slider between, upper cover and slider between, slider and guide ring between, slider and guide bar between, slider and base between are all formed five friction pairs by sliding fit;At least one friction surface of at least one friction pair, fixedly set braided layer, the friction pair structure with braided layer is matrix, braided layer is woven from polytetrafluoroethylene fiber and aromatic polyamide fiber.The utility model in the braided layer wear resistance is high, friction coefficient is low, to make its use time increase on die, realizes the replacement-free of braided layer in die life cycle, greatly reduce production cost.

Description

Technical Field

[0001] This utility model belongs to the field of tire malfunction mold technology, specifically relating to a tire malfunction mold. Background Technology

[0002] Radial tire movable molds are used to produce radial tires. They are the most personalized "dynamic" molds in the mold family. During the tire vulcanization process, they need to undergo tens of thousands of opening and closing movements in a high-temperature (approximately 145-185℃), high-pressure (approximately 2.5-3.0MPa), and corrosive environment, and must withstand closing forces ranging from tens to thousands of tons. The structure of existing tire movable molds is as follows: Figure 1 As shown, it includes an upper cover 01, an upper slider 02, a slider 03, a guide bar 04, a guide ring 05, and a base 06. The slider 03 is located between the upper cover 01 and the base 06, and multiple sliders are arranged in a circumferential direction. The slider 03 can move radially relative to the upper cover 01 and the base 06. The guide ring 05 is sleeved on the outside of the slider 03. The guide ring 05 is configured to drive the slider 03 to move radially outward when it moves away from the base 06 in the direction of its own axis. The guide bar 04 is connected to the inner side of the guide ring 05. The upper slider 02 is located on the upper part of the slider 03 and slides with the upper cover 01. The upper cover 01 and the upper slider 02, the upper cover 01 and the slider 03, the slider 03 and the guide ring 05, the slider 03 and the guide bar 04, and the slider 03 and the base 06 are all in sliding fit, thus forming five friction pairs. In order to ensure the lubrication of the opening and closing movement, a wear-resistant plate is installed on one of the friction surfaces of the above friction pairs. The wear-resistant plate is connected to the corresponding components by a large number of screws. The existing wear-resistant plates are usually made of sintered copper alloy wear-resistant plates.

[0003] The above-mentioned wear-resistant plates have the following shortcomings: 1) The high coefficient of friction and rapid wear lead to changes in the clearance of each friction pair, reduced mold precision, and frequent replacement of wear-resistant plates, affecting tire vulcanization efficiency; in addition, due to the high coefficient of friction of the wear-resistant plates, the opening and closing of the mold is noisy and the mold is prone to jamming, that is, when the tire vulcanization is completed, the mold cannot be opened; 2) The mating parts that are paired with the wear-resistant plates need to be hardened, such as nitriding, electroplating, DLC, etc., which increases the processing cost and processing cycle. Utility Model Content

[0004] To address the problems of high friction coefficient and rapid wear of wear-resistant plates in existing tire swivel molds, this utility model provides a tire swivel mold.

[0005] A tire-operated mold includes an upper cover, an upper slider, a slider, a guide strip, a guide ring, and a base. The upper cover and the upper slider, the upper cover and the slider, the slider and the guide ring, the slider and the guide strip, and the slider and the base are all slidably engaged to form five friction pairs.

[0006] A braided layer is fixedly disposed on at least one friction surface of at least one friction pair, the friction pair structure with the braided layer being the base, and the braided layer being woven from polytetrafluoroethylene fibers and aramid fibers.

[0007] Preferably, the thickness of the braided layer is 0.1 to 3 mm.

[0008] Preferably, the woven layer is bonded to the substrate.

[0009] Preferably, the woven layer extends outward to wrap around the friction surface of the substrate.

[0010] Preferably, the woven layer extends outward and covers one or more end faces of the substrate other than the friction surface, which are provided with a plurality of parallel first grooves, and the woven layer is embedded in the first grooves.

[0011] Preferably, the woven layer and the substrate are connected by a pressure block.

[0012] Preferably, the woven layer extends outward to wrap around the friction surface of the substrate;

[0013] The portion of the braided layer covering the friction surface is the working part, and the portion of the braided layer extending outwards and covering other sides of the substrate is the connecting part;

[0014] At least two connecting parts are clamped by pressure blocks, and the pressure blocks are fastened to the base by screws.

[0015] Preferably, a pressure block is provided on one or more end faces of the substrate other than the friction surface covered by the outward extension of the woven layer, and the pressure block is fastened to the substrate by screws. Preferably, a plurality of parallel second grooves are provided on the side of the substrate opposite to the pressure block, and the woven layer is embedded in the second grooves to form a third groove; the pressure block is provided with a protrusion adapted to the third groove.

[0016] Preferably, a transition layer is provided on the friction surface of the substrate used to install the braided layer, and the transition layer is an alloy layer or a composite material layer.

[0017] The beneficial effects of this utility model are:

[0018] (1) The braided layer in this utility model has high wear resistance and low friction coefficient, which increases its service life on the mold and realizes the replacement of the braided layer within the life cycle of the mold, greatly reducing the production cost.

[0019] (2) In this utility model, the braided layer has no special requirements for the hardness of the grinding parts. Regardless of whether the grinding parts are hardened, they have a small amount of wear and a low coefficient of friction, which can shorten the processing cycle of the mold and reduce the production cost.

[0020] (3) Existing wear-resistant plates are connected to corresponding components by a large number of screws. The machining of screw holes on the mold is time-consuming and labor-intensive, and there is a phenomenon of screw falling off during use, which leads to production stoppage. However, when the braided layer of this utility model adopts the bonding connection method, it does not need to be fixed with screws, thus avoiding the defect of existing wear-resistant plates that require a large number of screws for connection. When the braided layer of this utility model adopts the connection method of bonding connection and pressure block pressing, the number of screws used for pressure block fixing on the basis of bonding connection is much smaller than the number of screws required for fixing existing wear-resistant plates. Therefore, compared with the installation of existing wear-resistant plates, the risk caused by screw connection defects is reduced to a certain extent. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0022] Figure 1 This is a schematic diagram of the structure of an existing tire swivel mold;

[0023] Figure 2 This is a schematic diagram of the structure of the braided layer in this utility model;

[0024] Figure 3 This is a schematic diagram of the structure when the woven layer and the substrate are bonded together. Figure 1 ;

[0025] Figure 4 This is a schematic diagram of the structure when the woven layer and the substrate are bonded together. Figure 2 ;

[0026] Figure 5 This is a structural diagram showing the mechanical connection between the braided layer and the base material. Figure 1 ;

[0027] Figure 6 This is a structural diagram showing the mechanical connection between the braided layer and the base material. Figure 2 ;

[0028] in:

[0029] 01. Top cover; 02. Upper slider; 03. Slider; 04. Guide bar; 05. Guide ring; 06. Base;

[0030] 1. Woven layer; 2. Substrate; 3. First groove; 4. Pressing block; 5. Second groove; 6. Third groove; 7. Protrusion. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1:

[0033] A tire-operated mold includes an upper cover 01, an upper slider 02, a slider 03, a guide strip 04, a guide ring 05, and a base 06. The upper cover 01 and the upper slider 02, the upper cover 01 and the slider 03, the slider 03 and the guide ring 05, the slider 03 and the guide strip 04, and the slider 03 and the base 06 are all in sliding fit to form five friction pairs.

[0034] A braided layer 1 is fixedly disposed on at least one friction surface of at least one friction pair. The friction pair structure with the braided layer 1 is a base 2. The braided layer 1 is woven from polytetrafluoroethylene fibers and aramid fibers. The structure of the braided layer 1 is as follows: Figure 2 As shown, the specific weaving of the braided layer 1 can be achieved using existing technology, and will not be described in detail here.

[0035] In the substrate 2, a transition layer is provided on the friction surface used to install the braided layer 1. The transition layer is an alloy layer or a composite material layer. The transition layer has wear-resistant and friction-reducing effects and can protect the friction surface of the friction pair.

[0036] Preferably, the thickness of the braided layer 1 is 0.1 to 3 mm.

[0037] Polytetrafluoroethylene (PTFE) fibers have a low coefficient of friction, while aramid fibers have high strength and are easy to bond. Therefore, the braided layer 1, which is woven from PTFE fibers and aramid fibers, has high wear resistance and a low coefficient of friction, thereby extending its service life on the mold and eliminating the need for replacement of the braided layer 1 throughout the mold's lifespan, thus greatly reducing production costs. At the same time, the braided layer 1 in this application does not have special requirements for the hardness of the grinding components, and the grinding components have a small amount of wear and a low coefficient of friction regardless of whether they are hardened.

[0038] The friction coefficient of the braided layer 1 of this application and the sintered copper alloy wear-resistant plate were compared using a friction testing machine. The braided layer 1 of this application was pasted onto the friction test block to form a test specimen. The thickness of the braided layer 1 used in the test specimen was 0.3 mm. The comparison specimen was a sintered copper alloy wear-resistant plate with a thickness of 1.2 mm.

[0039] Friction conditions: temperature 180℃, pressure 10MPa, friction speed 20mm / s, stroke 55mm, and the grinding part is a 40Cr nitrided steel plate.

[0040] According to friction coefficient experiments, the average friction coefficient of the sintered copper alloy wear-resistant plate gradually increases after a period of friction, and then its average friction coefficient is basically greater than 0.35. After 18,000 friction cycles, the wear amount of the sintered copper alloy wear-resistant plate is 0.3 mm, and the wear ratio is 25%. In the test sample, the woven layer 1 has a relatively stable friction coefficient with little change during long-term friction, and the average friction coefficient is less than 0.08. After 30,000 friction cycles, the wear amount is 0.035 mm, and the wear ratio is 11.67%, which is much lower than the wear ratio of the sintered copper alloy wear-resistant plate.

[0041] Therefore, compared with existing wear-resistant plates, the woven layer 1 of this application has high wear resistance, low friction coefficient, and does not require hardening treatment of the wear pair, thus its service life can be increased by more than 4 times.

[0042] In addition, a pressure resistance test was conducted on the test specimen. A pressure of 150 MPa was applied to the braided layer 1 of the test specimen and held for 10 seconds. The permanent deformation of the braided layer 1 in the test specimen was 0.01 mm, and no damage or peeling was observed. Therefore, the braided layer 1 of this application has good pressure resistance.

[0043] Example 2:

[0044] Based on Example 1, the braided layer 1 and the substrate 2 are bonded together.

[0045] Preferably, the woven layer 1 extends outward to wrap the friction surface of the substrate 2.

[0046] Preferably, the woven layer 1 extends outward and covers one or more end faces of the substrate 2, excluding the friction surface, with a plurality of parallel first grooves 3, and the woven layer 1 is embedded in the first grooves 3.

[0047] When the braided layer 1 and the substrate 2 are bonded together, the bonding process is as follows:

[0048] The braided layer 1 is impregnated with an adhesive, which is epoxy resin.

[0049] The woven layer 1 after impregnation is dried, and the dried woven layer 1 is covered on the friction surface of the substrate 2 and extended outward to other sides. When the first groove 3 is provided on the other sides, the woven layer 1 is embedded in the first groove 3.

[0050] The braided layer 1 was then subjected to pressure and heat treatment at a pressure of 0.8 MPa and a temperature of 190°C.

[0051] Afterwards, an air-cooling process will be carried out for two hours;

[0052] Finally, remove any remaining adhesive from the surface of the braided layer 1.

[0053] The structure when the braided layer 1 and the substrate 2 are bonded together is as follows: Figure 3 , Figure 4 As shown; Figure 3 The middle braided layer 1 extends outward from both sides of its width to cover one side of the substrate 2, and a first groove 3 is provided on both sides of the extended and covered layer. Figure 4 The middle braided layer 1 extends outwards on both sides of the width to cover the two sides of the substrate 2, and a first groove 3 is provided on the two outermost sides of the extended layer.

[0054] Example 3:

[0055] Based on Example 1, the braided layer 1 and the base 2 are connected by a pressure block 4.

[0056] Preferably, the braided layer 1 extends outward to wrap around the friction surface of the substrate 2;

[0057] The portion of the braided layer 1 covering the friction surface is the working part, and the portion of the braided layer 1 extending outwards and covering other sides of the substrate 2 is the connecting part;

[0058] At least two connecting parts are pressed together by pressure blocks 4. The pressing action of the pressure blocks 4 ensures that the working part of the braided layer 1 is tightly attached to the friction surface. The pressure blocks 4 and the base 2 are fastened together by screws.

[0059] Preferably, a plurality of parallel second grooves 5 are provided on the side of the base 2 opposite to the pressure block 4, and the braided layer 1 is embedded in the second grooves 5 to form a third groove 6; the pressure block 4 is provided with protrusions 7 that are adapted to the third groove 6, thereby increasing the fastening area.

[0060] The structure when the braided layer 1 and the base 2 are mechanically connected is as follows: Figure 5 , Figure 6 As shown; Figure 5 The two sides of the middle braided layer 1 extend outward to cover one side of the base 2. The two connecting parts of the extension are pressed and fixed by their respective pressure blocks 4, and the protrusions 7 on the two pressure blocks 4 are adapted to the corresponding third grooves 6. Figure 6 The braided layer 1 extends outward from both sides of its width to cover the two sides of the substrate 2. That is, the braided layer 1 has four connecting parts. The two outermost connecting parts are pressed and fixed by their respective pressure blocks 4, and the protrusions 7 on the two pressure blocks 4 are adapted to the corresponding third grooves 6.

[0061] Example 4:

[0062] Based on Example 1, the braided layer 1 is bonded to the substrate 2, and the braided layer 1 extends outward to wrap the friction surface of the substrate 2;

[0063] Pressure blocks 4 are provided on any one or more end faces of the substrate 2, other than the friction surface, which are covered by the outward extension of the braided layer 1. The pressure blocks 4 are fastened to the substrate 2 by screws.

[0064] Preferably, a plurality of parallel second grooves 5 are provided on the friction pair end face opposite to the pressure block 4, and the braided layer 1 is embedded in the second grooves 5 to form a third groove 6; the pressure block 4 is provided with a protrusion 7 that matches the third groove 6, thereby increasing the fastening area.

[0065] In Example 4, the braided layer 1 and the substrate 2 are connected by a combination of adhesive bonding and compression bonding. The process is as follows:

[0066] The braided layer 1 is impregnated with an adhesive, which is epoxy resin.

[0067] Dry the woven layer 1 after it has been impregnated with resin;

[0068] The dried braided layer 1 is covered on the corresponding friction surface and extended outward to cover other sides of the base 2, forming a wrapping shape on the friction surface; the braided layer 1 is embedded in the second groove 5;

[0069] The braided layer 1 was then subjected to pressure and heat treatment at a pressure of 0.8 MPa and a temperature of 190°C.

[0070] Afterwards, the air-cooling process is carried out for two hours; finally, the residual adhesive on the surface of the braided layer 1 is removed; the protrusion 7 of the pressure block 4 is embedded into the third groove 6, and the pressure block 4 and the base 2 are fastened together with screws.

[0071] In this application, both the first groove 3 and the second groove 5 have a structure that gradually narrows from the outside to the inside, and the cross-sections of both the first groove 3 and the second groove 5 are triangular.

[0072] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, they are not intended to limit the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the protection scope of the present utility model.

Claims

1. A tire-operated mold, comprising an upper cover (01), an upper slider (02), a slider (03), a guide strip (04), a guide ring (05), and a base (06), wherein five friction pairs are formed by sliding fit between the upper cover (01) and the upper slider (02), between the upper cover (01) and the slider (03), between the slider (03) and the guide ring (05), between the slider (03) and the guide strip (04), and between the slider (03) and the base (06); characterized in that, A braided layer (1) is fixedly disposed on at least one friction surface of at least one friction pair, and the friction pair structure with the braided layer (1) is a base (2). The braided layer (1) is woven from polytetrafluoroethylene fiber and aramid fiber.

2. The tire-operated mold as described in claim 1, characterized in that, The thickness of the braided layer (1) is 0.1 to 3 mm.

3. The tire-operated mold as described in claim 1, characterized in that, The woven layer (1) is bonded to the substrate (2).

4. The tire-operated mold as described in claim 3, characterized in that, The woven layer (1) extends outward to wrap the friction surface of the substrate (2).

5. The tire-operated mold as described in claim 4, characterized in that, The woven layer (1) extends outward and covers one or more end faces of the substrate (2) other than the friction surface, which are provided with a plurality of parallel first grooves (3), and the woven layer (1) is embedded in the first grooves (3).

6. The tire-operated mold as described in claim 1, characterized in that, The woven layer (1) and the base (2) are connected by a pressure block (4).

7. The tire-operated mold as described in claim 6, characterized in that, The woven layer (1) extends outward to wrap the friction surface of the substrate (2); The portion of the braided layer (1) covering the friction surface is the working part, and the portion of the braided layer (1) extending outward and covering the other sides of the substrate (2) is the connecting part; At least two connecting parts are clamped by pressure blocks (4), and the pressure blocks (4) are fastened to the base (2) by screws.

8. The tire-operated mold as described in claim 4, characterized in that, Pressure blocks (4) are provided on any one or more end faces of the substrate (2) covered by the outward extension of the braided layer (1), excluding the friction surface. The pressure blocks (4) are fastened to the substrate (2) by screws.

9. The tire-operated mold as described in claim 7 or 8, characterized in that, A number of parallel second grooves (5) are provided on the side of the base (2) opposite to the pressure block (4), and the braided layer (1) is embedded in the second groove (5) to form a third groove (6); the pressure block (4) is provided with a protrusion (7) that matches the third groove (6).

10. The tire-operated mold as described in claim 1, characterized in that, A transition layer is provided on the friction surface of the substrate (2) used to install the braided layer (1), and the transition layer is an alloy layer or a composite material layer.

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