Silica gel key vulcanization forming device

Abstract

The utility model relates to the field of vulcanized product manufacturing, in particular to a silica gel key vulcanization forming device which comprises an upper template and a lower template, an upper product groove is formed in the lower end of the upper template, a lower product groove is formed in the upper end of the lower template, and during mold closing, the upper product groove and the lower product groove jointly form a cavity; a first overflow groove is formed in the lower mold plate, and the first overflow groove is arranged around the lower product groove; the upper end face, close to one side of the cavity, of the first overflow groove is a first step, a second step is formed on one side, close to the cavity, of the lower end face of the upper die plate, and the first step and the second step are in lap joint during die assembly. During mold closing, the first step and the second step are in lap joint with each other, and the third step and the edge of the convex block are in lap joint with each other, so that after mold closing is completed, connection between a product and redundant silica gel is cut off or thinned, burrs are avoided, or the burrs can be directly torn off during burr removal, and more convenience is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vulcanized product manufacturing, and particularly relates to a silicone button vulcanization and molding device. Background Art

[0002] As the name implies, a silicone button is a button product made of silicone. Silicone buttons belong to a product category of silicone products. Silicone buttons have excellent heat resistance, cold resistance, environmental resistance, electrical insulation, fatigue resistance and other characteristics. Silicone is a highly active adsorbent material, belonging to the amorphous state. It is insoluble in water and any solvent, non-toxic and odorless, and has stable chemical properties. It does not react with any substance except strong alkalis and hydrofluoric acid. Silicone buttons with various models have different microporous structures due to different manufacturing methods. Silicone buttons are often used in electronic devices such as electronic calculators, remote control systems, telephones, cordless telephones, computer keyboards, learning machine buttons, password device buttons, and digital products.

[0003] In the prior art, a flat vulcanization mold is used to produce silicone buttons. However, in the production process, problems such as material shortage, many edge burrs and difficulty in cleaning often occur. Therefore, the utility model has developed a silicone button vulcanization and molding device to solve the problems existing in the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a silicone button vulcanization and molding device to solve the problems of material shortage, many edge burrs and difficulty in cleaning in the prior art.

[0005] The technical solution of the utility model is: a silicone button vulcanization and molding device, including an upper template and a lower template. An upper product groove is arranged at the lower end of the upper template, and a lower product groove is arranged at the upper end of the lower template. When the mold is closed, the upper product groove and the lower product groove jointly form a cavity.

[0006] A first overflow groove is arranged on the lower template, and the first overflow groove surrounds the lower product groove. The upper end surface of the first overflow groove close to the cavity side is a first step, and a second step is formed on the lower end surface of the upper template close to the cavity side. When the mold is closed, the first step and the second step overlap each other.

[0007] Preferably, a second overflow groove is arranged on the lower template, and the second overflow groove surrounds the first overflow groove. When the mold is closed, the distance between the second overflow groove and the upper template is smaller than the distance between the first overflow groove and the upper template.

[0008] Preferably, a third overflow groove is arranged on the lower template, and the third overflow groove surrounds the second overflow groove.

[0009] Preferably, a protrusion is formed on one side of the second overflow groove close to the third overflow groove. When the mold is closed, a gap is formed between the protrusion and the lower end surface of the upper template.

[0010] Preferably, a convex block is provided on the upper template, and a fourth overflow groove corresponding to the convex block is provided on the lower template. The upper end of the periphery of the fourth overflow groove is a third step; when the mold is closed, the edge of the lower end surface of the convex block is lapped with the third step.

[0011] Preferably, a plurality of core molds are provided at the lower product groove, and grooves are provided on the core molds. Before the mold is closed, conductive particles are placed in the grooves.

[0012] Compared with the prior art, the advantages of the present utility model are as follows:

[0013] (1) When the mold is closed, the first step and the second step are lapped with each other, and the third step and the edge of the convex block are lapped with each other, so that after the mold is closed, the connection between the product and the excess silicone is cut off or thinned, avoiding the generation of burrs or when removing burrs, it can be directly torn off, which is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0015] Figure 1 is a schematic structural diagram of the silicone button vulcanization molding device of the present utility model;

[0016] Figure 2 is a top view structural diagram of the silicone button vulcanization molding device of the present utility model;

[0017] Figure 3 is Figure 2 a sectional structural diagram taken along line A-A in

[0018] Figure 4 is Figure 3 an enlarged structural diagram at B in

[0019] Figure 5 is Figure 4 an enlarged structural diagram at B1 in

[0020] Figure 6 is Figure 3 an enlarged structural diagram at C in

[0021] Figure 7 is a schematic structural diagram of the upper template of the present utility model;

[0022] Figure 8 is a schematic structural diagram of the lower template of the present utility model.

[0023] Wherein: upper template 1, upper product groove 11, second step 111, bump 12;

[0024] Lower template 2, lower product groove 21, first overflow groove 22, first step 221, second overflow groove 23, third overflow groove 24, protrusion 25, gap 251, fourth overflow groove 26, third step 261;

[0025] Cavity 3;

[0026] Button product 4, through hole 41. Specific implementation mode

[0027] The following combines specific embodiments to further elaborate on the content of the present utility model:

[0028] As Figures 1-8 shown, this embodiment is applied to the manufacture of silicone buttons, adopting the flat vulcanization molding process, and the raw material is solid silicone. The solid silicone is cut into a plate shape according to the specifications of the silicone button, and the amount of the solid silicone raw material is greater than the amount required for the molding of the button product. First, conductive particles are placed in the groove of the lower template manually or mechanically; then, the solid silicone raw material is placed on the lower template and covers the lower product groove, and the upper template moves downward under the drive of the vulcanization equipment to close the mold; during the mold closing process, the upper template presses against the silicone raw material, causing the silicone raw material to flow in the upper product groove and the lower product groove until the cavity is completely filled, and the excess silicone raw material flows out through the first overflow groove; after the mold closing is completed, heat vulcanization and shaping are carried out through the mold, and at this time, the conductive particles adhere to the silicone on the silicone; when opening the mold, the upper template moves upward and separates from the button product, and then the button product 4 on the lower template is taken out manually or by a robotic arm. Specifically:

[0029] A silicone button vulcanization molding device includes an upper template 1 and a lower template 2. The lower end of the upper template 1 is provided with an upper product groove 11, and the upper end of the lower template 2 is provided with a lower product groove 21. When the mold is closed, the upper product and the lower product groove 21 together form a cavity 3.

[0030] The lower template 2 is provided with a first overflow groove 22, and the first overflow groove 22 is arranged around the lower product groove 21; the upper end surface of the first overflow groove 22 close to the cavity 3 is a first step 221, and the lower end surface of the upper template 1 close to the cavity 3 forms a second step 111. When the mold is closed, the first step 221 and the second step 111 overlap each other. The lower template 2 is provided with a second overflow groove 23, and the second overflow groove 23 is arranged around the first overflow groove 22. When the mold is closed, the distance between the second overflow groove 23 and the upper template 1 is smaller than the distance between the first overflow groove 22 and the upper template 1. The lower template 2 is provided with a third overflow groove 24, and the third overflow groove 24 is arranged around the second overflow groove 23. A protrusion 25 is formed on one side of the second overflow groove 23 close to the third overflow groove 24. When the mold is closed, a gap 251 is formed between the protrusion 25 and the lower end surface of the upper template 1.

[0031] In this embodiment, when the mold is closed, as the upper template 1 extrudes the solid silica gel, the solid silica gel flows, and when the mold closing is completed, the solid silica gel completely fills the cavity 3. Among them, the distance between the second overflow groove 23 and the upper template 1 is smaller than that of the first overflow groove 22 after the mold is closed, and the setting of the protrusion 25 makes the solid silica gel tend to flow in the direction of the cavity 3 when flowing, so that the solid silica gel in the cavity 3 can flow sufficiently, avoiding the occurrence of material shortage. After the mold is closed, the first step 221 and the second step 111 overlap each other, which can cut off the connection between the key product 4 and the redundant silica gel, avoiding the generation of burrs.

[0032] The upper template 1 is provided with a convex block 12, and the lower template 2 is provided with a fourth overflow groove 26 corresponding to the convex block 12. The upper end of the periphery of the fourth overflow groove 26 is a third step 261; when the mold is closed, the lower end surface edge of the convex block 12 overlaps with the third step 261.

[0033] In this embodiment, the setting of the convex block 12 and the fourth overflow groove 26 forms a through hole 41 on the key product 4, so as to facilitate the subsequent installation and positioning of the key product 4. Through the setting of the fourth overflow groove 26, when the mold is closed, a part of the redundant silica gel raw material flows to the fourth overflow groove 26, avoiding the occurrence of bubbles caused by bubbles or incomplete filling. The setting of the overlap between the convex block 12 and the third step 261 can cut off the connection between the key product 4 and the redundant material in the fourth overflow groove 26, avoiding the generation of burrs.

[0034] It should be noted that in actual production, due to the long-term use and wear of the mold or the influence of design accuracy, etc., it may cause the first step 221 and the second step 111 not to be in complete contact connection, or the convex block 12 and the third step 261 not to be in complete contact connection. However, this design can still greatly thin the connection between the key product 4 and the redundant raw material, so that there is only an extremely thin connection layer between the key product 4 and the redundant raw material, which can be separated from the key product 4 during material taking, or directly torn off manually after the material taking is completed, and the operation is convenient. In addition, the silicone product is not conductive, and conductive particles need to be connected at the key. When the key is pressed, it is connected to the circuit board through the conductive particles to complete the control action. Therefore, when the key product 4 is molded, a plurality of core molds are arranged at the lower product groove 21, and grooves are arranged on the core molds. Before the mold is closed, the conductive particles are placed in the grooves. After molding, the conductive particles adhere to the corresponding positions of the key product 4.

[0035] In this embodiment, guide post, guide sleeve and other guiding and positioning devices, heating devices and other structures are arranged on the upper template 1 and the lower template 2 to ensure the normal or stable operation of the flat vulcanization mold. These are all prior arts and will not be elaborated in this embodiment.

[0036] The above embodiments are only used to illustrate the technical concept and features of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A vulcanization molding device for silicone rubber buttons, characterized in that: It includes an upper template and a lower template. A product slot is provided at the lower end of the upper template, and a product slot is provided at the upper end of the lower template. When the molds are closed, the upper product slot and the lower product slot jointly form a cavity; A first overflow groove is provided on the lower template, and the first overflow groove is arranged around the lower product slot; the upper end face of the first overflow groove close to the cavity side is a first step, and a second step is formed on the lower end face of the upper template close to the cavity side. When the molds are closed, the first step and the second step overlap each other.

2. A silicone button vulcanization and molding device according to claim 1, characterized in that: A second overflow groove is provided on the lower template, and the second overflow groove is arranged around the first overflow groove. When the molds are closed, the distance between the second overflow groove and the upper template is smaller than the distance between the first overflow groove and the upper template.

3. A silicone button vulcanization and molding device according to claim 2, characterized in that: A third overflow groove is provided on the lower template, and the third overflow groove is arranged around the second overflow groove.

4. A silicone button vulcanization and molding device according to claim 3, characterized in that: A protrusion is formed on one side of the second overflow groove close to the third overflow groove. When the molds are closed, a gap is formed between the protrusion and the lower end face of the upper template.

5. A silicone button vulcanization and molding device according to claim 4, characterized in that: A convex block is provided on the upper template, and a fourth overflow groove corresponding to the convex block is provided on the lower template. The upper end of the periphery of the fourth overflow groove is a third step; when the molds are closed, the edge of the lower end face of the convex block overlaps with the third step.

6. A vulcanization molding device for silicone rubber buttons according to claim 1, wherein: A plurality of core pins are provided at the lower product slot, and grooves are provided on the core pins. Before the molds are closed, conductive particles are placed in the grooves.

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