A preforming jig

Abstract

The utility model discloses a preforming jig, including lower mould and being located in the upper of lower mould upper mould, the lower mould is detachably installed with preforming jig on, wherein the lower mould with the upper mould's opposite end face is equipped with several position corresponding upper cavity and lower cavity, the preforming jig upper and lower two ends are formed with the convex corresponding with upper cavity and lower cavity respectively, when the upper mould with preforming jig is covered in succession on the lower mould, upper cavity with preforming jig upper end's convex and lower cavity with preforming jig lower end's convex are formed with the forming space of section being "C" shape respectively, this design scheme has designed the preforming jig that cooperates with the silica gel package plastic part mould, has realized the standardization, accurate preplastic of silica gel material, has solved the industry difficult problem of the inhomogeneity of manual wrapping and inlay positioning inaccuracy completely.

Description

Technical Field

[0001] This utility model belongs to the field of silicone rubber product processing technology, specifically a pre-forming fixture. Background Technology

[0002] In the silicone rubber products industry, it is often necessary to coat silicone onto the outside of plastic or metal parts to combine the flexibility of silicone with the strength of the insert. The traditional production process is as follows: operators manually wrap the weighed silicone raw material around the insert (such as a plastic part), then place this semi-finished product into the lower mold cavity, and finally, the upper and lower molds are closed together for vulcanization under high temperature and pressure.

[0003] However, this traditional method has obvious drawbacks: First, manual wrapping relies entirely on the experience of the operators, making it difficult to ensure the uniform distribution of silicone around the insert, which can easily lead to localized areas of excessively thick or thin silicone. Second, during the mold closing process, the flowing silicone material can exert uneven pressure on the insert, causing it to shift or deflect within the cavity. As a result, the molded product often exhibits quality problems such as the insert being off-center or even exposed, leading to a high product defect rate. In addition, manual wrapping is inefficient, requires high worker skills, and increases production costs. Utility Model Content

[0004] To overcome the shortcomings of the prior art, the purpose of this utility model is to provide a preform fixture.

[0005] The technical solution adopted by this utility model is as follows: A preforming fixture includes a lower mold and an upper mold located directly above the lower mold. The preforming fixture is detachably mounted on the lower mold. The lower mold and the upper mold have a plurality of upper cavities and lower cavities corresponding to each other on their opposite end faces. The upper and lower ends of the preforming fixture have protrusions corresponding to the upper and lower cavities. When the upper mold and the preforming fixture are sequentially covered on the lower mold, the upper cavity and the protrusion at the upper end of the preforming fixture, and the lower cavity and the protrusion at the lower end of the preforming fixture, respectively enclose a forming space with a "C" shaped cross section.

[0006] In a preferred embodiment, the protrusion has the same shape as the upper and lower cavities, and the cross-sectional dimension of the protrusion is smaller than that of the upper and lower cavities.

[0007] In a preferred embodiment, the preforming fixture is arranged in a flat plate shape. When the upper mold and the preforming fixture are sequentially covered on the lower mold, the upper and lower end faces of the preforming fixture are respectively in contact with the bottom end face of the upper mold and the top end face of the lower mold.

[0008] In a preferred embodiment, both the upper and lower surfaces of the preform fixture are coated with a Teflon coating.

[0009] In a preferred embodiment, positioning protrusions are spaced apart at the four corners of the top of the lower mold, and the top of the positioning protrusions is a frustum-shaped structure that is narrower at the top and wider at the bottom.

[0010] In a preferred embodiment, the preform fixture has a through-hole corresponding to the positioning protrusion, and the inner diameter of the positioning hole is the same as the outer diameter of the main body of the positioning protrusion.

[0011] In a preferred embodiment, the bottom of the upper mold is provided with a guide sleeve corresponding to the positioning protrusion. The inner diameter of the guide sleeve is the same as the outer diameter of the main body of the positioning protrusion, and the height of the guide sleeve combined with the positioning hole is the same as the height of the positioning protrusion.

[0012] In a preferred embodiment, the preforming fixture has symmetrically provided hand holes, and when the preforming fixture is installed on the lower mold, the hand holes are located at the outer periphery of the lower mold.

[0013] In a preferred embodiment, the preform fixture is made of high-strength alloy steel.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: by pre-molding the silicone material into a shape with precise grooves using a pre-forming fixture, the position of the insert is ensured to be accurate, effectively preventing the displacement and eccentricity of the insert caused by the flow of the rubber material during vulcanization, significantly reducing the product defect rate to about 3%, which fully meets production requirements, greatly improves efficiency and reduces production costs, improves product quality, and does not require modification of the existing mold main structure. Only corresponding pre-forming fixtures need to be made for different products, making it more applicable. Attached Figure Description

[0015] Figure 1 This is a simplified three-dimensional structural diagram of the present invention (the silicone raw material is in its original state);

[0016] Figure 2 This is a simplified three-dimensional structural diagram of the preformed fixture in this utility model;

[0017] Figure 3 This is a simplified front view diagram of the preformed fixture in this utility model.

[0018] Figure 4 This is a simplified three-dimensional structural diagram of the upper mold in this utility model;

[0019] Figure 5 This is a simplified three-dimensional structural diagram of the lower mold in this utility model;

[0020] Figure 6 This is a simplified three-dimensional structural diagram of the silicone raw material in a plasticized state assembled with the insert in the lower mold in this utility model.

[0021] Figure 7 This is a simplified cross-sectional planar structural diagram of the finished product after combining silicone raw materials and plastic parts in this utility model.

[0022] Marked in the image:

[0023] 100 - Upper mold, 110 - Guide sleeve, 120 - Upper cavity;

[0024] 200 - Preformed fixture, 210 - Hand hole, 220 - Positioning hole, 230 - Protrusion;

[0025] 300 - Lower mold, 310 - Lower cavity, 320 - Positioning pin;

[0026] 400 - Silicone raw material;

[0027] 500 - Embedded component. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0031] A preforming fixture, as described above Figure 1-7The system includes a lower mold 300 and an upper mold 100 located directly above the lower mold 300. A preforming fixture 200 is detachably mounted on the lower mold 300. The lower mold 300 and the upper mold 100 have several corresponding upper cavities 120 and lower cavities 310 on their opposite end faces. The preforming fixture 200 has protrusions 230 at its upper and lower ends, corresponding to the upper cavities 120 and lower cavities 310, respectively. When the upper mold 100 and the preforming fixture 200 are sequentially fitted onto the lower mold 300, the upper cavities 120 and the protrusions 230 at the upper and lower ends of the preforming fixture 200 are connected. The cavity 310 and the protrusion 230 at the lower end of the preforming fixture 200 respectively enclose a molding space with a "C" shaped cross section. A detachable preforming fixture 200 is designed between the lower mold 300 and the upper mold 100. Through the cooperation of the lower mold 300, the preforming fixture 200 and the upper mold 100, the silicone raw material 400 can be pre-shaped into a shape with precise grooves, ensuring the accurate placement of the insert 500. This effectively prevents the insert from shifting or deflecting due to the flow of rubber during vulcanization, fully meeting production requirements and improving production efficiency and product quality.

[0032] It is worth mentioning that the design of the pre-forming fixture 200 does not require any changes to the existing mold structure. Only the corresponding pre-forming fixture 200 needs to be made for different products. It can also be used for silicone-on-silicone (requiring silicones of different hardness / color to be combined), silicone-on-metal parts, and the silicone material 400 can be replaced with rubber to wrap plastic parts, rubber-on-metal parts, etc., making it more applicable to a wider range of scenarios. Moreover, using this fixture in production can improve product quality, increase efficiency, and reduce production costs.

[0033] In this embodiment, the protrusion 230 has the same shape as the upper cavity 120 and the lower cavity 310. The cross-sectional dimension of the protrusion 230 is smaller than that of the upper cavity 120 and the lower cavity 310. The preforming fixture 200 is arranged in a flat plate structure. When the upper mold 100 and the preforming fixture 200 are successively covered on the lower mold 300, the upper and lower end faces of the preforming fixture 200 are respectively attached to the bottom end face of the upper mold 100 and the top end face of the lower mold 300. The above design ensures that the molding space is uniform and consistent, which facilitates the uniform flow and filling of the silicone raw material 400 during the preforming process, avoids local excessive thickness or thinness, and improves the dimensional accuracy and consistency of the silicone raw material 400 after molding.

[0034] In this embodiment, the upper and lower surfaces of the preform jig 200 are coated with Teflon. The purpose of coating the preform jig 200 with Teflon is to ensure that the silicone raw material 400 does not stick to the preform jig 200, and to ensure that the silicone raw material 400 only sticks to the upper cavity 120 and lower cavity 310 in the lower mold and upper mold.

[0035] In this embodiment, please refer to Figure 2 and Figure 5 As shown, positioning protrusions 320 are distributed at four intervals on the top of the lower mold 300. The top of the positioning protrusions 320 is a frustum-shaped structure that is narrower at the top and wider at the bottom. The preforming fixture 200 has a positioning hole 220 that corresponds to the positioning protrusions 320. The inner diameter of the positioning hole 220 is the same as the outer diameter of the main body of the positioning protrusion 320. The cooperation between the positioning hole 220 and the positioning protrusion 320 can realize the precise positioning of the preforming fixture 200 and the lower mold 300, prevent the fixture from moving or shifting during processing, ensure the positional accuracy of the forming space, and thus ensure product consistency. Secondly, the frustum-shaped structure of the positioning protrusions 320 can also play a guiding role, which facilitates the initial positioning of the preforming fixture 200 and the upper mold 100, reduces alignment time, and improves the ease of operation.

[0036] In this embodiment, please refer to Figure 4 As shown, the bottom of the upper mold 100 is fitted with a guide sleeve 110 corresponding to the positioning protrusion 320. The inner diameter of the guide sleeve 110 is the same as the outer diameter of the main body of the positioning protrusion 320. The height of the guide sleeve 110 combined with the positioning hole 220 is the same as the height of the positioning protrusion 320. The cooperation between the guide sleeve 110 and the positioning protrusion 320 ensures that the upper mold 100 and the lower mold 300 are precisely aligned when the mold is closed, preventing product defects caused by misalignment. At the same time, the height matching between the guide sleeve 110 and the positioning hole 220 ensures the stability of the overall structure.

[0037] In this embodiment, please refer to Figure 1 and Figure 2 As shown, the preforming fixture 200 has symmetrically provided hand holes 210. When the preforming fixture 200 is installed on the lower mold 300, the hand holes 210 are located on the outer periphery of the lower mold 300. The hand holes 210 make it easy for the operator to safely and quickly pick up and put down the preforming fixture 200, reducing the difficulty and time of operation, improving the production rhythm and humanized design.

[0038] Preferably, the preforming fixture 200 is made of high-strength alloy steel. High-strength alloy steel has excellent wear resistance, high temperature resistance and deformation resistance, which ensures the durability of the preforming fixture 200 for long-term use in high temperature and high pressure environments, and reduces the replacement frequency and maintenance costs.

[0039] The specific operation method of this utility model is as follows:

[0040] 1. First, install the lower mold 300 and the upper mold 100 onto the vulcanizing molding machine (not shown in the figure);

[0041] 2. Before production, all parts of the mold must be thoroughly cleaned, and the mold must be heated to the specified temperature.

[0042] 3. During production, the silicone raw material 400 is placed in the middle of the lower cavity 310, then the pre-forming fixture 200 is placed on it, and then the silicone raw material 400 is placed on the pre-forming fixture 200. Finally, the upper and lower molds are closed to compress the silicone raw material 400. The silicone raw material 400 is shaped by the joint compression of the lower mold 300, the pre-forming fixture 200, and the upper mold 100.

[0043] 4. Next, open the mold and remove the pre-forming fixture 200. The shaped silicone raw material 400 will then stick to the upper and lower molds.

[0044] 5. At this point, the insert 500 can be aligned with the groove shaped by the silicone raw material 400 and placed in it. Then, the upper and lower molds are closed and vulcanized under high temperature and high pressure to produce a product that meets the requirements.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A preforming fixture, comprising a lower mold and an upper mold disposed directly above the lower mold, characterized in that, A preforming fixture is detachably mounted on the lower mold. The lower mold and the upper mold have several corresponding upper and lower cavities on their opposite end faces. The upper and lower ends of the preforming fixture have protrusions corresponding to the upper and lower cavities. When the upper mold and the preforming fixture are sequentially covered on the lower mold, the upper cavity and the protrusion at the upper end of the preforming fixture, as well as the lower cavity and the protrusion at the lower end of the preforming fixture, respectively enclose a forming space with a "C" shaped cross section.

2. The preformed fixture as described in claim 1, characterized in that: The protrusion has the same shape as the upper and lower cavities, and the cross-sectional dimension of the protrusion is smaller than that of the upper and lower cavities.

3. The preformed fixture as described in claim 2, characterized in that: The preforming fixture is arranged in a flat plate shape. When the upper mold and the preforming fixture are sequentially covered on the lower mold, the upper and lower end faces of the preforming fixture are respectively in contact with the bottom end face of the upper mold and the top end face of the lower mold.

4. The preforming fixture as described in claim 3, characterized in that: The preformed fixture has a Teflon coating on both its upper and lower surfaces.

5. The preforming fixture as described in claim 4, characterized in that: The lower mold has positioning protrusions spaced at the four corners of its top, and the top of each positioning protrusion is a frustum-shaped structure that is narrower at the top and wider at the bottom.

6. The preforming fixture as described in claim 5, characterized in that: The preform fixture has a through-hole corresponding to the positioning protrusion, and the inner diameter of the positioning hole is the same as the outer diameter of the main body of the positioning protrusion.

7. The preforming fixture as described in claim 6, characterized in that: The bottom of the upper mold is fitted with a guide sleeve corresponding to the positioning protrusion. The inner diameter of the guide sleeve is the same as the outer diameter of the main body of the positioning protrusion. The height of the guide sleeve combined with the positioning hole is the same as the height of the positioning protrusion.

8. The preform fixture as described in claim 1, characterized in that: The preforming fixture has symmetrically provided hand holes. When the preforming fixture is installed on the lower mold, the hand holes are located at the outer periphery of the lower mold.

9. The preform fixture as described in any one of claims 1-8, characterized in that: The preform fixture is made of high-strength alloy steel.

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