A flat plate vulcanization rubber mold capable of adjusting mold pressure balance

Abstract

The present application relates to a kind of adjustable mold pressure equalization flat vulcanization rubber mold, the flat vulcanization mold is made of upper die, lower die, the flat vulcanization machine has upper die plate, lower die base, the upper die is installed on upper die plate, lower die is installed on lower die base, upper die moves up and down with upper die plate, it is relative to the movement of lower die, and it is opened / closed mold;The lower surface of the upper die plate is opposite to the upper surface of the upper die, one is concave, one is plane, the contact between the two is in the middle part gap, the maximum gap center is 0.3-0.5mm, it is gradually smaller from inside to outside.Using concave design, there is a gap in the middle part of the contact surface, which is used for compensation, so that the matching gap of each position of the mold is basically the same when the mold is closed, so that the temperature and pressure of each position of the mold are balanced, the rubber material in the cavity is balanced during the rubber vulcanization process, the thickness tolerance of each area of the sealing rubber strip is controlled within ±0.015mm, and the standard is reached.

Description

TECHNICAL FIELD

[0001] The present application relates to sealing ring technology, in particular to a flat plate vulcanized rubber mold capable of adjusting mold pressure balance. BACKGROUND

[0002] For the sealing strip of hydrogen energy fuel cell industry, the thickness size is generally 0.4-0.7mm, and the precision requirement is ±0.02mm. In the face of such high tolerance requirements, the mold processing tolerance can be basically controlled at ±0.01mm, and the tolerance space of the rubber forming process is very small, so that the precision of the formed sealing strip cannot meet the standard. SUMMARY

[0003] To solve the above problems, the present application provides a flat plate vulcanized rubber mold capable of adjusting mold pressure balance, and the thickness tolerance of each region of the sealing strip formed by using the mold is controlled at ±0.015mm, which meets the standard.

[0004] The technical scheme of the present application is as follows:

[0005] A flat plate vulcanized rubber mold capable of adjusting mold pressure balance, the flat plate vulcanized mold is composed of an upper mold and a lower mold, the flat plate vulcanizing machine has an upper mold plate and a lower mold base, the upper mold is installed on the upper mold plate and the lower mold is installed on the lower mold base, the upper mold moves up and down with the upper mold plate and moves relative to the lower mold to open / close the mold;

[0006] The lower surface of the upper mold plate is opposite to the upper surface of the upper mold, one of them is concave and the other is flat, the peripheral part between them is in contact, and the middle part has a gap, the maximum gap center is 0.3-0.5mm, which gradually decreases from inside to outside;

[0007] Or

[0008] The upper heat plate is further installed between the upper mold plate and the upper mold, the lower surface of the upper mold plate is opposite to the upper surface of the upper heat plate, and the lower surface of the upper heat plate is opposite to the upper surface of the upper mold, the lower surface of the upper mold plate is flat, the upper and lower surfaces of the upper heat plate are both flat, the upper surface of the upper mold is concave, the lower surface of the upper mold plate is in contact with the upper surface of the upper heat plate, the lower surface of the upper heat plate is in contact with the peripheral side of the upper surface of the upper mold, and the middle part has a gap, the maximum gap center is 0.3-0.5mm, which gradually decreases from inside to outside.

[0009] The lower surface of the lower mold is opposite to the upper surface of the lower mold base, one of them is concave and the other is flat, the peripheral part between them is in contact, and the middle part has a gap, the maximum gap center is 0.3-0.5mm, which gradually decreases from inside to outside;

[0010] Or

[0011] A lower heating plate is also installed between the lower mold and the lower mold base. The lower surface of the lower mold is opposite to the upper surface of the lower heating plate, and the lower surface of the lower heating plate is opposite to the upper surface of the lower mold base. The lower surface of the lower mold is concave, and the lower heating plate is a flat plate with both its upper and lower surfaces being planar. The upper surface of the lower mold base is planar. The lower surface of the lower mold is in contact with the periphery of the upper surface of the lower heating plate, with a gap in the middle. The gap is largest at the center, ranging from 0.3 to 0.5 mm, and gradually decreases from the inside to the outside. The lower surface of the lower heating plate is in surface contact with the upper surface of the lower mold base.

[0012] The advantages of this invention are its reasonable design and ingenious concept. The thickness of the sealing strip is related to the fluidity of the rubber compound during the vulcanization process, which in turn is greatly influenced by the temperature and pressure at various points on the mold. My research on traditional molds revealed that due to the structure of the flat vulcanizing machine, the point of force is located in the middle of the mold during mold closing. This results in larger gaps at both ends and smaller gaps in the middle, leading to uneven temperature and pressure across the mold and affecting the fluidity of the rubber compound during vulcanization, ultimately resulting in a sealing strip thickness that does not meet standards. Based on this, we made an improvement by adopting a concave design with a gap in the middle of the contact surface for compensation. This ensures that the gaps at various points on the mold are essentially uniform during mold closing, resulting in balanced temperature and pressure across the mold. During the vulcanization process, the rubber compound within the cavity is evenly distributed, and the thickness tolerance of the sealing strip in each area is controlled within ±0.015mm, meeting the standard.

[0013] We have taken into consideration the maximum center clearance of 0.3-0.5mm, which gradually decreases from the inside to the outside. With this clearance, the upper mold rigidly deforms under pressure, and the middle part also makes contact, so the pressure can be effectively transmitted. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a flat vulcanizing rubber mold with adjustable mold pressure.

[0015] Figure 2 This is a schematic diagram of the measurement positions for a flat vulcanized rubber mold with adjustable mold pressure equalization.

[0016] The diagram shows the upper mold 1, lower mold 2, upper template 3, lower mold base 4, and upper heating plate 5. Detailed Implementation

[0017] like Figure 1 As shown, a flat vulcanizing rubber mold with adjustable mold pressure equalization is provided. The flat vulcanizing mold consists of an upper mold 1 and a lower mold 2. The flat vulcanizing machine has an upper template 3 and a lower mold base 4. The upper mold 1 is installed on the upper template 3 and the lower mold 2 is installed on the lower mold base 4. The upper mold 1 moves up and down with the upper template 3 and moves relative to the lower mold 2 to open / close the mold.

[0018] The upper hot plate 5 is installed between the upper mold plate 1 and the upper mold 3, the lower surface of the upper mold plate 3 is opposite to the upper surface of the upper hot plate 5, the lower surface of the upper hot plate 5 is opposite to the upper surface of the upper mold 1, the lower surface of the upper mold plate 3 is a plane, the upper hot plate 5 is a flat plate, the upper and lower surfaces of the upper hot plate 5 are planes, the upper surface of the upper mold 1 is a concave surface, the lower surface of the upper mold plate 3 is in surface contact with the upper surface of the upper hot plate 5, the lower surface of the upper hot plate 5 is in contact with the periphery of the upper surface of the upper mold 1, and a gap is left in the middle part, the center of the gap is the largest, and is 0.3-0.5mm, which gradually decreases from the inside to the outside.

[0019] Temperature measurement:

[0020] As shown in the table, the temperature of the nine typical positions of the mold is measured (measured at the moment of opening the mold) by using a point thermometer; Figure 2

[0021] Comparing the conventional mold and the flat plate vulcanized rubber mold with adjustable mold pressure balance, the test data is listed in the following table,

[0022]

[0023] It can be seen by comparison that, compared with the conventional mold, the temperature of each position of the flat plate vulcanized rubber mold with adjustable mold pressure balance is close to balance.

[0024] Mold surface strain measurement:

[0025] As shown in the table, the stress of the nine typical positions of the mold is measured by using a stress strain gauge (patch type): Figure 2

[0026] Comparing the conventional mold and the flat plate vulcanized rubber mold with adjustable mold pressure balance, the test data is listed in the following table,

[0027]

[0028] It can be seen by comparison that, compared with the conventional mold, the pressure of each position of the flat plate vulcanized rubber mold with adjustable mold pressure balance is close to balance.

[0029] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.​​

Claims

1. An adjustable mold pressure balanced flat vulcanization rubber mold, the flat vulcanization mold is composed of an upper mold and a lower mold, the flat vulcanization machine has an upper mold plate and a lower mold base, the upper mold is installed on the upper mold plate and the lower mold is installed on the lower mold base, the upper mold moves up and down with the upper mold plate, and moves relative to the lower mold to open / close the mold; characterized in that, the lower surface of the upper mold plate is opposite to the upper surface of the upper mold, one of them is concave and the other is flat, the peripheral part between them is in contact, and the middle part has a gap, the center of the gap is the largest, which is 0.3-0.5mm, and it gradually decreases from inside to outside; or an upper hot plate is further installed between the upper mold plate and the upper mold, the lower surface of the upper mold plate is opposite to the upper surface of the upper hot plate, and the lower surface of the upper hot plate is opposite to the upper surface of the upper mold, the lower surface of the upper mold plate is flat, the upper and lower surfaces of the upper hot plate are both flat, the upper surface of the upper mold is concave, the lower surface of the upper mold plate is in contact with the upper surface of the upper hot plate, the lower surface of the upper hot plate is in contact with the peripheral part of the upper surface of the upper mold, and the middle part has a gap, the center of the gap is the largest, which is 0.3-0.5mm, and it gradually decreases from inside to outside.

2. An adjustable mold pressure equalized flat panel vulcanization rubber mold according to claim 1, wherein, the lower surface of the lower mold is opposite to the upper surface of the lower mold base, one of them is concave and the other is flat, the peripheral part between them is in contact, and the middle part has a gap, the center of the gap is the largest, which is 0.3-0.5mm, and it gradually decreases from inside to outside; or a lower hot plate is further installed between the lower mold and the lower mold base, the lower surface of the lower mold is opposite to the upper surface of the lower hot plate, and the lower surface of the lower hot plate is opposite to the upper surface of the lower mold base, the lower surface of the lower mold is concave, the lower hot plate is a flat plate, and its upper and lower surfaces are both flat, the upper surface of the lower mold base is flat, the lower surface of the lower mold is in contact with the peripheral part of the upper surface of the lower hot plate, and the middle part has a gap, the center of the gap is the largest, which is 0.3-0.5mm, and it gradually decreases from inside to outside, and the lower surface of the lower hot plate is in contact with the upper surface of the lower mold base.

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