Mould for mould pressing of rubber diaphragm

Abstract

The utility model relates to the technical field of mould pressing rubber diaphragm production equipment, in particular to a mould for mould pressing rubber diaphragms, which comprises a mould body, a plurality of mould cavities, a plurality of mould pressing plates and a plurality of mould pressing plates, the bearing surfaces are arranged in a gap between every two adjacent cavities and on the outer side of the outermost cavity; in the extension direction of the bearing surface, the height of the middle area of the bearing surface is larger than that of the two end areas, and the width of the middle area of the bearing surface is smaller than that of the two end areas; compared with the prior art, by means of the non-uniform structural design that the middle of the bearing face is high and narrow, and the two ends of the bearing face are low and wide, the defect that a traditional uniform bearing face cannot compensate rubber material flowing path difference and pressure attenuation is fundamentally overcome, and rubber material overflowing resistance in different areas is actively adjusted; and the thickness uniformity and the flatness of the rubber diaphragm are obviously improved.

Description

Technical Field

[0001] This utility model relates to the technical field of equipment for producing molded rubber diaphragms, and in particular to a mold for producing molded rubber diaphragms. Background Technology

[0002] In the molding production of rubber diaphragms, rectangular array cavity molds are widely used due to their potential advantages of high production efficiency and good product consistency. These molds typically have support surfaces (also known as overflow surfaces or parting surface steps) between adjacent cavities and outside the outermost cavity. Their core function is to guide the flow of rubber material and control the amount of overflow during mold closing, thereby ensuring the quality of product molding. However, there are significant defects in the existing technology: when the rubber material flows from the center to the edge within the rectangular array, there is a natural difference in path length and pressure attenuation. Traditional support surfaces are designed with uniform height and width. This uniform structure cannot actively adjust the overflow resistance of rubber material in different areas, resulting in premature and excessive overflow of rubber material in cavities near the center of the array, leading to thinner product thickness. Cavities at the edge or corner of the array have excessive overflow resistance and insufficient rubber material filling compensation, resulting in thicker product thickness. Ultimately, the thickness uniformity of the entire diaphragm sheet is poor, and the flatness cannot meet the requirements of high-precision scenarios.

[0003] Furthermore, the uniform support surface structure has poor adaptability to deviations in the placement of the material strips, making it impossible to precisely guide the two-dimensional flow of the rubber material within the cavity. For the innermost and outermost boundary cavities of the array, the rubber material can only overflow onto one side of the support surface. The existing symmetrical support surface design is not optimized for this special flow condition, further exacerbating the thickness difference between the boundary products and the internal products. Therefore, it is urgent to improve the flow balance and pressure distribution of the rubber material in the rectangular array cavity through mold structure innovation, and solve the technical problem of insufficient flatness and uniformity of the rubber diaphragm molding. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model proposes a mold for molding rubber diaphragms.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A mold for molding rubber diaphragms, comprising:

[0007] The mold body has multiple cavities arranged in a rectangular array.

[0008] A supporting surface is provided at the gap between two adjacent cavities and on the outer side of the outermost cavity;

[0009] Wherein, along its own extension direction, the height of the middle region of the supporting surface is greater than the height of the two end regions, and the width of the middle region is less than the width of the two end regions.

[0010] Furthermore, the height and / or width of the supporting surface gradually change from the middle region to both end regions along its extension direction.

[0011] Furthermore, the supporting surface, in a cross-section perpendicular to its extension direction, is arc-shaped or wedge-shaped, with a high center and low sides.

[0012] Furthermore, the height of the cross section varies along the extension direction of the supporting surface, with the cross section height in the middle region being greater than that in the two end regions.

[0013] Furthermore, among the multiple cavities distributed in a rectangular array, one cavity located at the geometric center of the array is eliminated, forming a central region for collecting the adhesive material.

[0014] Furthermore, for a support surface with the cavity on only one side, it has an asymmetrical arc or wedge shape in cross-section perpendicular to its extension direction, and its cross-sectional height gradually decreases from the middle high point toward the side with the cavity.

[0015] Furthermore, the mold body is provided with a positioning groove corresponding to the supporting surface, and the positioning groove is used to fix the preformed material strip.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] Compared with existing technologies, this utility model fundamentally solves the problem of traditional uniform support surfaces being unable to compensate for differences in rubber flow paths and pressure attenuation through a non-uniform structural design with a "high and narrow middle, low and wide ends" support surface. It actively adjusts the overflow resistance of rubber in different areas, significantly improving the thickness uniformity and flatness of the rubber diaphragm. The design of various additional features further optimizes the performance. The continuously varying height and width, along with the arc / wedge-shaped cross-section, achieves a smooth transition in overflow resistance, reducing rubber retention and air bubble defects. The directional change in cross-sectional height precisely matches the pressure attenuation law with the central convergence area, providing sufficient rubber replenishment to the edge cavities and adapting to large-size array molds. The asymmetrical cross-sectional structure adapts to the unilateral flow characteristics of the boundary cavities, reducing the difference between the boundary and internal products. The positioning groove effectively fixes the position of the material strip, improving molding stability and repeatability. The overall structural design is simple, requiring no additional complex mechanisms, and is directly compatible with existing molding production processes. It is suitable for the production of rubber diaphragms of different sizes and with different precision requirements, demonstrating significant practical value and promising prospects for promotion. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the mold for molding rubber diaphragms proposed in this utility model;

[0019] Figure 2This is a first cross-sectional view of the supporting surface in the mold for molding rubber diaphragms proposed in this utility model;

[0020] Figure 3 This is a top view of the supporting surface in the mold for molding rubber diaphragms proposed in this utility model;

[0021] Figure 4 This is a second cross-sectional view of the supporting surface in the mold for molding rubber diaphragms proposed in this utility model.

[0022] In the diagram: 1-Mold body, 11-Cavity, 12-Supporting surface, 13-Positioning groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figures 1-4 As shown, this embodiment provides a mold for molding rubber diaphragms, comprising:

[0025] The mold body 1 has multiple cavities 11 arranged in a rectangular array.

[0026] Supporting surface 12 is provided at the gap between two adjacent cavities 11 and on the outside of the outermost cavity 11;

[0027] Wherein, along its own extending direction, the height of the middle region of the supporting surface 12 is greater than the height of the two end regions, and the width of the middle region is less than the width of the two end regions.

[0028] Overall, it includes a mold body 1 and a supporting surface 12; the mold body 1 has multiple cavities 11 arranged in a rectangular array for molding rubber diaphragms; the supporting surface 12 is located at the gap between two adjacent cavities 11 and on the outside of the outermost cavity 11, for controlling the overflow and flow direction of the rubber material; the key point is that, along its own extension direction, the height of the middle region of the supporting surface 12 is greater than the height of the two end regions, and the width of the middle region is less than the width of the two end regions.

[0029] Through the above structural design, the middle area of ​​the support surface 12 forms a "high and narrow" structure with greater overflow resistance, which can suppress premature overflow of the rubber material in the central area; the two end areas form a "low and wide" structure with less overflow resistance, which can compensate for the problem of insufficient rubber material flow pressure in the edge area, thereby balancing the rubber material filling and overflow rate of the entire array and improving the uniformity of product thickness.

[0030] like Figures 2-3 As shown, in this embodiment, the height and / or width of the supporting surface 12 gradually change from the middle region to both ends along its extension direction.

[0031] The supporting surface 12 has an arc or wedge shape with a high center and low sides on a cross section perpendicular to its extension direction.

[0032] Specifically, the height and width of the supporting surface 12 gradually change from the middle region to both ends along its extension direction, and the supporting surface 12 is arc-shaped or wedge-shaped with a high middle and low sides on the cross section perpendicular to its extension direction.

[0033] Specific structure: Taking the supporting surface 12 at the gap between adjacent cavities 11 in the rectangular array as an example, its extension direction is horizontal; the height H1 of the middle area of ​​the supporting surface 12 is 0.8-1.2mm, and the width W1 is 2-3mm; when extending to both ends, the height continuously decreases from H1 to 0.3-0.5mm (height H2 of both ends area), and the width continuously increases from W1 to 4-6mm (width W2 of both ends area); when the cross-sectional shape is arc-shaped, the radius of the arc is 5-10mm; when it is wedge-shaped, the inclination angle of the two inclined surfaces is 3-8°.

[0034] The design of continuously varying height and width allows the overflow resistance to transition smoothly along the extension direction of the support surface 12, avoiding sudden pressure changes during the flow of the rubber material and further improving the uniformity of the rubber material filling. The arc or wedge-shaped cross section can reduce the shear resistance of the rubber material flow, reduce the risk of rubber material retention, and facilitate venting during mold closing, reducing product bubble defects.

[0035] like Figures 1-3 As shown, in this embodiment, the height of the cross section varies along the extension direction of the supporting surface 12, and the cross section height in the middle region is greater than the cross section height in the two end regions.

[0036] In the plurality of cavities 11 distributed in a rectangular array, one cavity 11 located at the geometric center of the array is eliminated, forming a central region for collecting the adhesive.

[0037] Specifically, the cross-sectional height of the supporting surface 12 varies along its extension direction, with the cross-sectional height of the middle region being greater than that of the two end regions; at the same time, among the multiple cavities 11 distributed in a rectangular array, one cavity 11 located at the geometric center of the array is eliminated, forming a central region for collecting the adhesive material.

[0038] Taking a 3×3 rectangular array as an example, the cavity 11 in the second row and second column at the center is removed to form a central gathering area. The cross-sectional height of the middle section of the supporting surface 12 around this area (i.e., the supporting surface 12 at the gap connecting the central area and the eight surrounding cavities 11) is 0.2-0.3mm higher than the middle section of the supporting surface 12 in other areas, and the width is 0.5-1mm narrower, to ensure that the adhesive in the central area flows preferentially to the surrounding cavities 11 and the flow pressure is uniform.

[0039] The directional change of the cross-sectional height can accurately match the pressure decay law of the rubber material from the center to the edge, further enhancing the adjustment accuracy of the overflow resistance; the central collection area can serve as a "reserve" for the rubber material, preventing excessive overflow of the rubber material in the cavity 11 near the center, while providing sufficient rubber material replenishment for the edge cavity 11, significantly improving the problem of insufficient filling of the edge cavity 11.

[0040] like Figure 4 As shown, in this embodiment, for the support surface 12 with the cavity 11 provided on only one side, it is asymmetrically arc-shaped or wedge-shaped in cross-section perpendicular to its extension direction, and its cross-sectional height gradually decreases from the middle high point to the side with the cavity 11.

[0041] Specifically, for the special flow conditions of the boundary cavity 11, the optimization is applicable to the support surface 12 with cavity 11 on only one side (i.e., the outer support surface 12 of the outermost cavity 11, the support surface 12 at the gap between adjacent cavities 11 on only one side in the edge row / column of the rectangular array): the support surface 12 is asymmetrical arc or wedge-shaped in the cross section perpendicular to its extension direction, and its cross section height gradually decreases from the middle high point to the side with cavity 11, and the decrease is smaller to the side without cavity 11.

[0042] Specific structure: Taking the outer support surface 12 of the outermost cavity 11 as an example, the height of the middle high point is 0.9mm, the slope angle towards the cavity 11 side (inner side) is 6°, and the height is reduced to 0.4mm; the slope angle towards the side without cavity 11 (outer side) is 2°, and the height is reduced to 0.7mm; the width direction still maintains a continuous gradient structure that is narrow in the middle (2.5mm) and wide at both ends (5mm).

[0043] By adapting the asymmetrical cross-sectional structure to the characteristics of the unilateral flow of adhesive material in the boundary cavity 11, the low resistance design on the cavity 11 side can ensure that the adhesive material fully fills the cavity 11, while the high resistance design on the non-cavity 11 side can prevent excessive overflow of adhesive material, effectively reducing the thickness difference between the boundary product and the internal product, and improving the consistency of the entire product.

[0044] like Figure 1 As shown, in this embodiment, the mold body 1 is provided with a positioning groove 13 corresponding to the supporting surface 12, and the positioning groove 13 is used to fix the preformed material strip.

[0045] Specifically, a positioning structure is added: the mold body 1 is provided with a positioning groove 13 corresponding to the supporting surface 12. The positioning groove 13 is opened in the middle area of ​​the supporting surface 12 along the extension direction of the supporting surface 12. The width of the positioning groove 13 is 1.05-1.1 times the width of the preformed strip, and the depth is 0.3-0.5mm.

[0046] Specific structure: The positioning groove 13 corresponds one-to-one with the supporting surface 12. On the supporting surface 12 between adjacent cavities 11, the positioning groove 13 is located on the symmetrical center line of the two cavities 11; on the outer supporting surface 12 of the outermost cavity 11, the positioning groove 13 is located on the side of the supporting surface 12 closer to the cavity 11; the preformed strip is placed in the positioning groove 13, and the position of the strip is fixed by the limiting effect of the positioning groove 13.

[0047] By setting the positioning groove 13, the placement position of the preformed strip can be accurately fixed, reducing the problem of uneven distribution of adhesive caused by strip offset; at the same time, the positioning groove 13 can guide the adhesive to flow along the preset path, further enhancing the fine control of adhesive flow and improving the stability and repeatability of product molding.

[0048] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0050] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A mold for molding rubber diaphragms, characterized in that, include: The mold body (1) has multiple cavities (11) arranged in a rectangular array. A support surface (12) is provided at the gap between two adjacent cavities (11) and on the outside of the outermost cavity (11); The supporting surface (12) extends along its own direction, with the height of the middle region being greater than the height of the two end regions, and the width of the middle region being less than the width of the two end regions.

2. The mold according to claim 1, characterized in that, The height and / or width of the supporting surface (12) gradually change from the middle region to both ends along its extension direction.

3. The mold according to claim 2, characterized in that, The supporting surface (12) is arc-shaped or wedge-shaped with a high center and low sides on a cross section perpendicular to its extension direction.

4. The mold according to claim 3, characterized in that, The height of the cross section varies along the extension direction of the supporting surface (12), with the cross section height in the middle region being greater than that in the two end regions.

5. The mold according to claim 4, characterized in that, In the plurality of cavities (11) distributed in a rectangular array, one cavity (11) located at the geometric center of the array is eliminated, forming a central region for collecting adhesive.

6. The mold according to claim 3 or 4, characterized in that, For a support surface (12) with the cavity (11) on only one side, it is asymmetrically arc-shaped or wedge-shaped in cross section perpendicular to its extension direction, and its cross section height gradually decreases from the middle high point to the side with the cavity (11).

7. The mold according to any one of claims 1-5, characterized in that, The mold body (1) is provided with a positioning groove (13) corresponding to the supporting surface (12), and the positioning groove (13) is used to fix the preformed material strip.

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