Elastic limiting pad forming die

Abstract

The utility model relates to the technical field of rubber forming, in particular to an elastic limiting pad forming die which comprises an upper die, a middle die and a lower die, the middle die is cylindrical, and the lower die is provided with a circular groove used for positioning the middle die and an annular groove used for forming an elastic limiting pad. The upper die is provided with a first through hole matched with the middle die and an annular pressing block corresponding to the annular groove. Forming of the annular elastic limiting pad is achieved through the upper mold, the middle mold and the lower mold, during demolding, the middle mold is arranged at the position of the first through hole of the upper mold, the middle mold is matched with the first through hole, then certain pressure is applied to the middle mold, and therefore the elastic limiting pad is separated from the middle mold. The mold is reasonable in design and simple in structure, facilitates forming and demolding of the elastic limiting pad, and particularly facilitates forming and demolding of an annular limiting pad with the inner wall being unequal in diameter.

Description

Technical Field

[0001] This utility model relates to the field of rubber molding technology, and in particular to an elastic limiting pad molding die. Background Technology

[0002] An elastic limiting pad is a ring-shaped rubber ring made of rubber material, which is an essential elastic element in industries such as automotive, aviation, petroleum, and photocopying.

[0003] The molding of elastic retaining pads involves placing rubber material in a mold and molding it under high temperature and pressure. During the molding process, due to the shrinkage of the rubber material after pressure and cooling, the molded elastic retaining pads tend to stick to the inner wall of the mold, making it difficult to remove the elastic rubber pads from the mold. Alternatively, to facilitate the demolding of the elastic retaining pads, existing molding molds have complex structures, increasing the production investment and equipment maintenance costs for enterprises. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing an elastic limiting pad molding mold. It has a reasonable design, simple structure, and facilitates the molding and demolding of elastic limiting pads, especially for annular limiting pads with non-uniform inner diameters.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an elastic limiting pad forming mold, including an upper mold, a middle mold and a lower mold, wherein the middle mold is cylindrical, the lower mold is provided with a circular groove for positioning the middle mold and an annular groove for forming the elastic limiting pad, and the upper mold is provided with a first through hole that cooperates with the middle mold and an annular pressure block that corresponds to the annular groove.

[0006] Furthermore, the lower end of the intermediate mold or / both ends of the intermediate mold are provided with chamfers.

[0007] Furthermore, the intermediate mold is provided with a second through hole, the axis of which is coaxial or parallel to the axis of the intermediate mold.

[0008] Furthermore, an annular protrusion is provided on the lower part of the outer wall of the intermediate mold.

[0009] Furthermore, the first through hole is a stepped hole.

[0010] The beneficial effects of this utility model are as follows: An elastic limiting pad forming mold includes an upper mold, a middle mold, and a lower mold. The middle mold is cylindrical. The lower mold is provided with a circular groove for positioning the middle mold and an annular groove for forming the elastic limiting pad. The upper mold is provided with a first through hole that mates with the middle mold and an annular pressure block corresponding to the annular groove. The upper mold, middle mold, and lower mold are used to form the annular elastic limiting pad. During demolding, the middle mold is placed at the position of the first through hole in the upper mold. By engaging the middle mold with the first through hole and applying pressure to the middle mold, the elastic limiting pad is detached from the middle mold. This utility model has a reasonable design, simple structure, and facilitates the forming and demolding of elastic limiting pads, especially for annular limiting pads with non-uniform inner diameters. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the upper mold structure.

[0013] Figure 3 This is a schematic diagram of the lower mold structure.

[0014] Figure 4 This is a structural schematic diagram of the intermediate mold.

[0015] Explanation of reference numerals in the attached figures:

[0016] 1—Upper mold, 11—First through hole, 12—Annular pressure block, 2—Middle mold, 21—Second through hole, 22—Annular protrusion, 3—Lower mold, 31—Circular groove, 32—Annular groove. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the present invention.

[0018] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] like Figures 1-4 As shown, an elastic limiting pad forming mold of this embodiment includes an upper mold 1, a middle mold 2 and a lower mold 3. The upper mold 1, the middle mold 2 and the lower mold 3 are coaxial. The middle mold 2 is cylindrical. The lower mold 3 is provided with a circular groove 31 for positioning the middle mold 2 and an annular groove 32 for forming the elastic limiting pad. The upper mold 1 is provided with a first through hole 11 that cooperates with the middle mold 2 and an annular pressure block 12 corresponding to the annular groove 32. During operation, the middle mold 2 is placed into the circular groove 31 of the lower mold 3. The outer wall of the middle mold 2 is used to form the inner wall of the annular groove 32, which is also used to form the inner wall of the annular elastic limiting pad. The rubber strip is placed into the annular groove 32, and the upper mold 1 is placed above the lower mold 3, so that the annular pressing block 12 of the upper mold 1 corresponds to the annular groove 32. The first through hole 11 of the upper mold 1 is coaxial with the middle mold 2. The mold is heated and a certain pressure is applied to the upper mold 1, so that the rubber strip is heated and formed in the mold. After forming, the upper mold 1 and the middle mold 2 are removed. The middle mold 2 is placed above the upper mold 1, and the middle mold 2 is coaxial with the first through hole 11 of the upper mold 1. A certain pressure is applied to the middle mold 2. Under the action of the upper mold 1 and the external pressure, the product separates from the middle mold 2, realizing the demolding of the product.

[0021] The lower end of the middle mold 2 and / or both ends of the middle mold 2 are provided with chamfers. The chamfer at the lower end of the middle mold 2 facilitates the middle mold 2 to be placed into the circular groove 31 of the lower mold 3 and ensures the fit between the middle mold 2 and the lower mold 3, avoiding gaps between the middle mold 2 and the lower mold 3. At the same time, when the product is demolded, it is easy to put the middle mold 2 into the first through hole 11 of the upper mold 1. The chamfer at the upper end of the middle mold 2 facilitates the demolding of the annular elastic limiting pad from the middle mold 2 when pressure is applied to the middle mold 2.

[0022] The middle mold 2 is provided with a second through hole 21. The axis of the second through hole 21 is coaxial or parallel to the middle mold 2. The middle mold 2 is easily grasped through the second through hole 21, which facilitates the removal and placement of the middle mold 2 into the lower mold 3 without affecting the molding and demolding operations.

[0023] The lower part of the outer wall of the middle mold 2 is provided with an annular protrusion 22. The annular protrusion 22 is used to form a lip on the inner wall of the elastic limiting pad or to form a stepped inner wall on the inner wall of the elastic limiting pad. The diameter of the first through hole 11 of the upper mold 1 is larger than the outer diameter of the middle mold 2, larger than the outer diameter of the annular protrusion 22, and smaller than the outer diameter of the elastic limiting pad.

[0024] The first through hole 11 of the upper mold 1 is a stepped hole, which facilitates the demolding of the elastic limiting pad with a lip or a stepped inner wall.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A molding die for an elastic limiting pad, characterized in that: It includes an upper mold (1), a middle mold (2) and a lower mold (3). The middle mold (2) is cylindrical. The lower mold (3) is provided with a circular groove (31) for positioning the middle mold (2) and an annular groove (32) for forming an elastic limiting pad. The upper mold (1) is provided with a first through hole (11) that cooperates with the middle mold (2) and an annular pressure block (12) corresponding to the annular groove (32).

2. The elastic limiting pad forming mold according to claim 1, characterized in that: The lower end of the middle mold (2) or / both ends of the middle mold (2) are provided with chamfers.

3. The elastic limiting pad forming mold according to claim 1, characterized in that: The middle mold (2) is provided with a second through hole (21), and the axis of the second through hole (21) is coaxial or parallel to the axis of the middle mold (2).

4. The elastic limiting pad forming mold according to claim 1, characterized in that: The lower part of the outer wall of the middle mold (2) is provided with an annular protrusion (22).

5. The elastic limiting pad forming mold according to claim 4, characterized in that: The first through hole (11) is a stepped hole.

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