Vulcanized rubber compression fatigue heat generation sample preparation mold

Abstract

The utility model provides a vulcanized rubber compression fatigue heat generation sample preparation mold, which belongs to the field of rubber molds, and comprises a cover plate, a gasket and a positioning part, and the cover plate comprises an upper cover plate and a lower cover plate which are correspondingly arranged; the gasket is arranged between the upper cover plate and the lower cover plate; a plurality of glue overflowing grooves are correspondingly formed in the upper surface and the lower surface of the gasket; the multiple positioning parts are arranged in the outer side circumferential direction of the cover plate and the outer side circumferential direction of the gasket and used for connecting the cover plate with the gasket. The vulcanized rubber compression fatigue heat generation sample preparation mold disclosed by the utility model is simple in structure and convenient to operate, and can solve the problems of complicated operation, low sample preparation efficiency, unfixed interface edge curve of a prepared composite material sample, difference between parallel samples and the like in the existing sample preparation mold.

Description

Technical Field

[0001] The utility model belongs to the technical field of rubber moulds, in particular to a vulcanized rubber compression fatigue heating sample making mould. Background Art

[0002] Carbon black filled reinforced rubber material is a composite vulcanized rubber material widely used in rubber engineering products. It has excellent viscoelastic properties. At the same time, due to the energy loss caused by the friction within the rubber molecular chain, there are obvious hysteresis losses and heat generation. When the tire made of carbon black filled reinforced rubber and skeleton materials (steel wire and fiber cord) is running at high speed, the internal structure temperature of the tire can exceed 100°C. Under such high temperature and high frequency conditions, the rubber will accelerate fatigue and its service life will be greatly reduced. Therefore, the study of the compression fatigue heat generation performance of rubber materials can reveal the thermal-mechanical coupling mechanism of carbon black filled reinforced rubber materials and improve the service life of tires.

[0003] During the actual use of tires, the heat-generating parts of tires under high-speed durability conditions are mainly concentrated in the middle of the crown, the shoulder and the tread. These parts are mainly composed of multiple layers of rubber. Among them, the shoulder and the tread are composed of multiple layers of rubber plus the end points of the skeleton material. There are different thermal fatigue properties and delamination between the rubber materials due to differences in hardness and adhesion. This cannot be tested and characterized by the thermal fatigue test of a single rubber. Therefore, it is necessary to prepare corresponding composite vulcanized specimens according to the rubber materials of different test parts of the tire. However, the existing sample preparation mold has problems such as the interface edge curve of the prepared composite sample is not fixed and there are differences between parallel samples, which affects the accuracy and repeatability of the test results, and the operation is complicated and the sample preparation efficiency is low. Utility Model Content

[0004] The utility model aims at the above-mentioned technical problems existing in the existing vulcanized rubber compression fatigue heating sample making mold, and proposes a vulcanized rubber compression fatigue heating sample making mold which has strong operability and can ensure stable sample test performance. The composite material compression heating sample prepared by using the mold of the utility model has regular and linear interfaces between different materials, and the test results are repeatable, which has guiding significance for studying the compression bonding performance and comprehensive dynamic heating performance between different materials.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a vulcanized rubber compression fatigue heating sample making mold, including a cover plate, including a corresponding upper cover plate and a lower cover plate; a gasket, which is arranged between the upper cover plate and the lower cover plate, and a plurality of overflow glue grooves are correspondingly arranged on the upper surface and the lower surface of the gasket; a plurality of positioning components are respectively arranged along the outer circumferential direction of the cover plate and the gasket, and the positioning components are used to connect the cover plate and the gasket.

[0006] Preferably, the upper cover plate is provided with a first cylindrical cavity, and the distance from the upper surface of the first cavity to the upper surface of the upper cover plate is ≥3mm; the first lower cover plate of the lower cover plate is provided with a second cavity corresponding to the first cavity, and the distance from the lower surface of the second cavity to the lower surface of the first lower cover plate is ≥3mm.

[0007] Preferably, the lower cover plate further includes a second lower cover plate and a third lower cover plate, wherein a central protrusion coaxial with the second lower cover plate is provided on the upper surface of the second lower cover plate, and a distance from the upper surface of the central protrusion to the upper surface of the first cavity is ≥3 mm.

[0008] Preferably, when the number of positioning components is an even number, the positioning components are symmetrically distributed along the outer circumference of the cover plate and the gasket; when the number of positioning components is an odd number, the positioning components are arranged along the outer circumference of the cover plate and the gasket at intervals of at least 45°.

[0009] Preferably, the positioning component and the gasket, and the positioning component and the cover plate are integrally formed or welded.

[0010] Preferably, the positioning component includes a first mold opening groove arranged along the circumferential direction of the outer side of the cover plate.

[0011] Preferably, the positioning component also includes a second mold opening slot arranged along the circumferential direction of the outer side of the gasket, the second mold opening slot is staggered with the adjacent overflow groove, and the second mold opening slot cooperates with the first mold opening slot.

[0012] Preferably, the vertical mold clearance L between the first mold slot and the matching second mold slot is ≥0.5mm, the horizontal mold clearance N between the first mold slot and the matching second mold slot is ≥0.5mm, and the locking boss height M of the second mold slot is ≥N+0.5mm.

[0013] Preferably, the positioning component further comprises a limit block arranged along the circumferential direction of the outer side of the gasket, and the limit block cooperates with the first mold opening slot.

[0014] Preferably, the opening of the overflow groove is rectangular or semicircular, and the depth of the groove is 0.2 to 1.5 mm.

[0015] Compared with the prior art, the advantages and positive effects of the utility model are as follows: a plurality of overflow grooves are correspondingly arranged on the upper and lower surfaces of the gasket of the utility model, so as to facilitate the discharge of excess rubber and gas between the rubbers; a positioning component is arranged to connect the cover plate and the gasket, so as to achieve the purpose of limiting, locking the mold, and quickly disassembling the mold, and to prevent the pre-vulcanized rubber from slightly flowing and causing the gasket to slip after the flat plate vulcanizer applies pressure, thereby causing deformation of the sample; cylindrical cavities of a certain height are respectively arranged on the upper cover plate and the lower cover plate, so as to ensure that the upper and lower cover plates have sufficient strength while ensuring the highest thermal energy efficiency utilization rate of the flat plate vulcanizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a vulcanized rubber compression fatigue heating sample making mold according to an embodiment of the utility model;

[0017] Figure 2 This is a schematic structural diagram of a mold for preparing the base rubber at the crown portion of an embodiment of the utility model;

[0018] Figure 3 This is a schematic structural diagram of a mold for preparing tread rubber at the crown portion of an embodiment of the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of a mold for preparing a film sample according to an embodiment of the utility model;

[0020] Figure 5 This is a schematic diagram of the staggered design of the overflow grooves when two gaskets are connected in the embodiment of the utility model;

[0021] Figure 6 It is a top view schematic diagram of the connection of two gaskets in an embodiment of the utility model;

[0022] Figure 7 This is a structural schematic diagram of a gasket provided with a mold slot in one embodiment of the utility model;

[0023] Figure 8 This is a top view schematic diagram of a gasket provided with a mold slot in one embodiment of the utility model;

[0024] Fig. 9 This is a schematic diagram of the matching relationship between two mold slots in one embodiment of the utility model;

[0025] Fig.10 This is a schematic diagram of a structure in which a limit block is arranged on a gasket in one embodiment of the utility model;

[0026] Fig.11 This is a schematic diagram of the matching relationship between the limit block and the mold opening slot in one embodiment of the utility model;

[0027] Fig.12 This is a schematic diagram of the structure of the crown portion sample prepared in Example 1;

[0028] Fig.13 for Fig.10 Schematic diagram of the cross-section of the sample structure at the crown part;

[0029] Fig.14 This is a schematic diagram of the structure of the sample piece at the sub-mouth portion prepared in Example 2;

[0030] Fig.15 for Fig.12 Schematic diagram of the cross-section structure of the sample at the mouth.

[0031] In the accompanying drawings, 1, upper cover plate, 11, first cavity; 2, gasket, 21, overflow groove; 3, lower cover plate, 31, first lower cover plate, 311, second cavity, 32, second lower cover plate, 321, center protrusion, 33, third lower cover plate; 41, first mold slot, 42, second mold slot, 43, limit block; 5, crown part sample, 51, tread rubber, 52, base rubber, 53, belt layer rubber, 54, crown part carcass rubber, 55, crown part inner lining rubber; 6, sub-mouth part sample, 61, wear-resistant protective rubber, 62, sub-mouth part carcass rubber, 63, apex rubber, 64, sub-mouth part inner lining rubber. DETAILED DESCRIPTION

[0032] In order to be able to understand the characteristics and technical contents of the embodiments of the utility model in more detail, the technical solutions in the embodiments of the utility model will be clearly and completely described below. Obviously, the embodiments described below are only part of the embodiments of the utility model, rather than all the embodiments of the utility model. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection requested by the utility model.

[0033] The utility model embodiment provides a vulcanized rubber compression fatigue heat generation sample making mold, referring to Figure 1 As shown, the vulcanized rubber compression fatigue heating sample preparation mold includes a cover plate, a gasket and a positioning component, wherein the cover plate includes an upper cover plate 1 and a lower cover plate 3, which provide heat energy and pressure for the vulcanization of the rubber sample. The upper cover plate 1 is in contact with the upper heating plate of the flat vulcanizer, and the thickness of the upper cover plate 1 is 5 to 10 mm; the lower cover plate 3 is in contact with the lower heating plate of the flat vulcanizer, and the thickness of the lower cover plate 3 is 5 to 10 mm. The upper cover plate 1 is provided with a first cylindrical cavity 11, and the distance from the upper surface of the first cavity 11 to the upper surface of the upper cover plate 1 is ≥3 mm. Reference Figure 1-Figure 4 As shown, the lower cover plate 3 includes a first lower cover plate 31, a second lower cover plate 32 and a third lower cover plate 33, wherein the first lower cover plate 31 is provided with a second cavity 311 corresponding to the first cavity 11, and the distance from the lower surface of the second cavity 311 to the lower surface of the first lower cover plate 31 is ≥3mm; the upper surface of the second lower cover plate 32 is provided with a central protrusion 321 coaxial with the second lower cover plate 32, and the distance from the upper surface of the central protrusion 321 to the upper surface of the first cavity 11 is ≥3mm. By providing a cylindrical cavity on the cover plate, the cover plate can have sufficient design strength while ensuring the highest thermal energy efficiency utilization rate of the flat vulcanizer.

[0034] The gasket of the vulcanized rubber compression fatigue heating sample making mold of the utility model embodiment is arranged between the upper cover plate 1 and the lower cover plate 3, the thickness of the gasket 2 is 1.0-20mm, and the number of gaskets 2 is determined according to the number of pre-vulcanized composite rubber layers and the specified size of the compression sample; the gasket 2 is made of high-strength steel to ensure that the gasket can quickly return to its original shape after deformation during the mold opening process; in order to facilitate the discharge of excess rubber and gas between rubber materials, a plurality of overflow grooves 21 are correspondingly arranged on the upper and lower surfaces of the gasket 2, and the grooves are rectangular or semicircular, and the depth of the grooves is 0.2-1.5mm. Reference Figure 5 and Figure 6 As shown, when the number of gaskets 2 is more than two, the overflow glue grooves 21 on the contact surfaces of two adjacent gaskets are staggered, and the staggered angle θ is 20 to 70°. This can prevent the overflow glue grooves 21 on the contact surfaces of adjacent gaskets from overlapping, resulting in excessive glue loss and glue shortage. It can also ensure that when the sample is cut later, the smaller overflow glue burrs can be quickly cut off without affecting the appearance of the sample and damaging the test specimen.

[0035] The positioning components of the vulcanized rubber compression fatigue heating sample preparation mold of the utility model embodiment are respectively arranged in multiple directions along the outer circumference of the cover plate and the gasket 2, and the positioning components are used to connect the cover plate and the gasket 2. The positioning components play the role of limiting, locking and quickly disassembling the mold, which can prevent the pre-vulcanized rubber from slightly flowing and causing the gasket 2 to slip and cause the sample to deform after the flat vulcanizer applies pressure. When the number of positioning components is an even number, the positioning components are symmetrically distributed along the outer circumference of the cover plate and the gasket 2; when the number of positioning components is an odd number, the positioning components are arranged at least 45° apart along the outer circumference of the cover plate and the gasket 2. The positioning components and the gasket 2, and the positioning components and the cover plate are all integrally formed or welded. When welding is used, the corresponding positioning components on the cover plate and the gasket 2 are matched and then welded as a whole. During the welding process, it is necessary to pay attention to the consistency of the matching relationship between different positioning components to prevent the cover plate and the gasket 2, and the gasket 2 and the gasket 2 from failing to match each other after welding.

[0036] In an optional embodiment, the positioning component includes a first mold opening slot 41 arranged along the circumferential direction of the outer side of the cover plate. Figure 7-Figure 9As shown, the positioning component also includes a second mold opening slot 42 arranged along the outer circumferential direction of the gasket 2, the second mold opening slot 42 is staggered with the adjacent overflow groove 21, and the second mold opening slot 42 matches the first mold opening slot 41. When the cover plate and the gasket 2 are matched through the positioning component, the mold opening clearance L in the vertical direction of the first mold opening slot 41 and the matching second mold opening slot 42 is ≥0.5mm, and a mold opening screwdriver or a hard blade can be placed; the mold opening clearance N in the horizontal direction of the first mold opening slot 41 and the matching second mold opening slot 42 is ≥0.5mm, and a mold opening screwdriver or a hard blade can be placed; the locking boss height M of the second mold opening slot 42 is ≥N+0.5mm, and the matching mold opening slot 41 can be locked. The mold opening method includes the following steps: placing a screwdriver or a hard blade horizontally, inserting it into the gap between the locking boss and the mold opening gap in the horizontal direction of the matching mold opening slot, disengaging the two matching mold opening slots, and after the mold opening gap is greater than the MN size height, placing the screwdriver or the hard blade vertically, inserting it into the mold opening gap in the vertical direction of the matching mold opening slot, so that the upper and lower mold parts rotate relative to each other, and then the mold can be opened in a rotating manner.

[0037] refer to Fig.10 and Fig.11 As shown, the positioning component also includes a limit block 43 arranged along the outer circumferential direction of the gasket 2, the limit block 43 cooperates with the first mold opening slot 41, and the distance between two adjacent limit blocks 43 matches the width of the protrusion at the bottom of the first mold opening slot 41. The limit block 43 is arranged on the gasket 2, which is more suitable for the case where the thickness of the gasket 2 is less than 2.0 mm and the mold opening is relatively easy.

[0038] The use of the vulcanized rubber compression fatigue heating sample preparation mold of the utility model to prepare a sample comprises the following steps: according to the number of types of composite materials in the tire part to be tested, preparing final rubber or laboratory samples of rubber materials, and respectively refining them on a rubber mixing mill; preheating the vulcanization mold to be used on a flat vulcanizer to reach thermal equilibrium; prevulcanizing different rubber materials on the flat vulcanizer into samples of specified thickness; preassembling the vulcanized rubber compression fatigue heating sample preparation mold by cooperating with the mold slots and checking it, stacking the prevulcanized samples in a specified order and then filling them into the above-mentioned mold to vulcanize the complete sample to obtain a test sample.

[0039] The vulcanized rubber compression fatigue heating sample making mold of the embodiment of the utility model obtains the corresponding preparation mold according to the combination of samples of different parts of the tire. In order to more clearly and in detail introduce the vulcanized rubber compression fatigue heating sample making mold provided by the embodiment of the utility model, the following will take the passenger radial tire as an example and describe it in combination with the specific embodiment. The crown part of the passenger radial tire is divided into tread rubber, base rubber, belt layer rubber, carcass rubber and inner liner rubber from the outer contour to the inner contour, and the mouth part of the passenger radial tire is divided into wear-resistant protective rubber, carcass rubber, apex rubber, carcass rubber and inner liner rubber from the outer contour to the inner contour, wherein the inner liner rubber is further divided into transition layer rubber and sealant.

[0040] Example 1

[0041] Mold preparation: tread rubber Figure 3 The mold assembly shown in the figure uses the base glue Figure 2 The mold assembly shown in the figure uses the belt layer glue Figure 4 The mold assembly shown, the carcass rubber is Figure 4 The mold assembly shown in the figure has an inner lining made of Figure 4 The mold assembly shown;

[0042] The preparation of the crown sample includes the following steps:

[0043] Take the final rubber of tread rubber, base rubber, belt rubber, carcass rubber and inner liner rubber from the tire manufacturing workshop, and respectively open-mix each rubber material on a rubber open mixing mill; preheat the above-mentioned mold components and compression heat generation test sample mold on a flat vulcanizer in advance to reach thermal equilibrium; pre-vulcanize the tread rubber, base rubber, belt rubber, carcass rubber and inner liner rubber on a flat vulcanizer to obtain pre-vulcanized samples; after stacking the tread rubber, base rubber, belt rubber, carcass rubber and inner liner rubber in sequence, push the inner liner rubber downward as a whole into the vulcanized rubber compression fatigue heat generation sample making mold, so that the inner liner rubber is located at the bottom of the mold, and vulcanize the complete sample to obtain the sample structure schematic diagram of the crown part as shown in the figure Fig.12 The cross-sectional structure diagram is shown in Fig.13 shown.

[0044] Example 2

[0045] Mold preparation: Wear-resistant protective rubber is used Figure 4 The mold assembly shown, the carcass rubber is Figure 4 The mold assembly shown, the apex is made of Figure 4 The mold assembly shown, the carcass rubber is Figure 4 The mold assembly shown in the figure has an inner lining made of Figure 4 The mold assembly shown;

[0046] The preparation of the sample of the sub-mouth part includes the following steps:

[0047] Take the final rubber of the wear-resistant protective rubber, carcass rubber, apex rubber and inner liner rubber from the tire manufacturing workshop, and respectively refine each rubber material on a rubber open mixer; preheat the above-mentioned mold components and compression heat generation test sample mold on a flat vulcanizer in advance to reach thermal equilibrium; pre-vulcanize the wear-resistant protective rubber, carcass rubber 1, apex rubber, carcass rubber 2 and inner liner rubber on a flat vulcanizer to obtain pre-vulcanized samples; after stacking the wear-resistant protective rubber, carcass rubber 1, apex rubber, carcass rubber 2 and inner liner rubber in sequence, push the inner liner rubber downward as a whole into the vulcanized rubber compression fatigue heat generation sample making mold, so that the inner liner rubber is located at the bottom of the mold, and vulcanize the complete sample to obtain the sample structure schematic diagram of the mouth part as shown in the figure Fig.14 The cross-sectional structure diagram is shown in Fig.15 shown.

[0048] Depend on Fig.13 and Fig.15 It can be seen that the sample prepared by using the vulcanized rubber compression fatigue heating sample preparation mold of the utility model has regular and linear interfaces between different materials, and can be used to test the compression fatigue heating performance of composite materials.

[0049] Finally, it should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only the better feasible embodiments of the present invention. The above-mentioned embodiments are only used to illustrate the technical scheme of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations, modifications, evolutions and improvements made by ordinary technicians in this field to the technical scheme of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A vulcanized rubber compression fatigue heating sample making mold, characterized in that: include A cover plate, comprising an upper cover plate and a lower cover plate which are arranged accordingly; A gasket is arranged between the upper cover plate and the lower cover plate, and a plurality of overflow glue grooves are arranged on the upper surface and the lower surface of the gasket accordingly; A plurality of positioning components are respectively arranged along the outer circumferential directions of the cover plate and the gasket, and the positioning components are used to connect the cover plate and the gasket.

2. The vulcanized rubber compression fatigue heating sample making mold according to claim 1, characterized in that: The upper cover plate is provided with a first cylindrical cavity, and the distance from the upper surface of the first cavity to the upper surface of the upper cover plate is ≥3mm; The first lower cover plate of the lower cover plate is provided with a second cavity corresponding to the first cavity, and the distance from the lower surface of the second cavity to the lower surface of the first lower cover plate is ≥3 mm.

3. The vulcanized rubber compression fatigue heating sample making mold according to claim 2, characterized in that: The lower cover plate also includes a second lower cover plate and a third lower cover plate, wherein: A central protrusion coaxial with the second lower cover plate is arranged on the upper surface of the second lower cover plate, and a distance from the upper surface of the central protrusion to the upper surface of the first cavity is ≥3 mm.

4. The vulcanized rubber compression fatigue heating sample making mold according to claim 1, characterized in that: When the number of the positioning components is an even number, the positioning components are symmetrically distributed along the outer circumference of the cover plate and the gasket; when the number of the positioning components is an odd number, the positioning components are arranged along the outer circumference of the cover plate and the gasket at intervals of at least 45°.

5. The vulcanized rubber compression fatigue heating sample making mold according to claim 1, characterized in that: The positioning component and the gasket, as well as the positioning component and the cover plate are integrally formed or welded together.

6. The vulcanized rubber compression fatigue heating sample making mold according to any one of claims 1 to 5, characterized in that: The positioning component comprises a first mold opening groove arranged along the circumferential direction of the outer side of the cover plate.

7. The vulcanized rubber compression fatigue heating sample making mold according to claim 6, characterized in that: The positioning component also includes a second mold opening slot arranged along the circumferential direction of the outer side of the gasket, the second mold opening slot and the adjacent overflow glue slot are staggered, and the second mold opening slot cooperates with the first mold opening slot.

8. The vulcanized rubber compression fatigue heating sample making mold according to claim 7, characterized in that: The vertical mold clearance L between the first mold slot and the matching second mold slot is ≥0.5mm, the horizontal mold clearance N between the first mold slot and the matching second mold slot is ≥0.5mm, and the locking boss height M of the second mold slot is ≥N+0.5mm.

9. The vulcanized rubber compression fatigue heating sample making mold according to claim 6, characterized in that: The positioning component also includes a limit block arranged along the circumferential direction of the outer side of the gasket, and the limit block cooperates with the first mold opening slot.

10. The vulcanized rubber compression fatigue heating sample making mold according to claim 1, characterized in that: The notch of the overflow glue groove is rectangular or semicircular, and the depth of the notch is 0.2 to 1.5 mm.

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