Processing die and processing method for preventing rubber skeleton adhesion member skeleton surface glue

Abstract

The application discloses a processing mold and processing method for preventing rubber framework bonding member framework surface glue, and belongs to the technical field of rubber member processing. The glue agent will flow in the cavity during hot vulcanization, and the gap between the metal framework and the mold during vulcanization cannot be solved by the traditional mold design, so that the glue agent flows to the gap between the metal framework and the mold and adheres to the surface of the metal framework. The adhered glue agent will need to increase the manual process to remove, which is laborious. The processing mold comprises an upper mold, a middle mold and a lower mold, and the lower mold is provided with an inner groove and an outer groove. The gap problem between the mold and the metal framework is solved, the bottom groove design tightly presses the metal framework to form a closed loop, the glue agent cannot flow to the surface of the metal framework, the appearance quality of the product is greatly improved, the process of removing the glue agent on the surface of the metal framework is saved, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of rubber part processing, in particular to a processing mold and processing method for preventing rubber framework bonding part framework surface glue. BACKGROUND

[0002] Rubber framework bonding parts are widely used in various fields such as bridges, automobiles, aerospace, etc., and play a crucial role in cushioning, shock absorption, support, etc. However, in the actual production process, the difficult-to-remove adhesive attached to the surface of the metal framework is a quality problem related to the appearance and cleanliness of the entire product. With the rapid development of modern social economy and technology, facing the "full-automatic installation production line" of the customer end, the camera used by the production line can accurately capture the surface cleanliness and appearance, so it is urgent to solve the problem of "adhesive attached to the surface of the framework".

[0003] The current method used in the industry is to increase the manual process to physically "wipe off" the surface of the vulcanized product, which lengthens the product process, is time-consuming and labor-intensive, and may damage the surface plating state of the framework, greatly increasing production costs and reducing production efficiency.

[0004] Therefore, improvements need to be made in mold design to avoid adhesive attachment to the surface of the framework during production vulcanization, reduce production costs, and improve product competitiveness. SUMMARY

[0005] 1. Technical problem to be solved by the invention

[0006] In view of the problems in the prior art that the adhesive flows into the gap between the framework and the model surface during the vulcanization process, resulting in adhesion, and is difficult to remove in the subsequent process, the present application provides a processing mold and process improvement scheme for preventing rubber framework bonding parts from overflowing adhesive to the outer surface of the framework during vulcanization. Achieve the effect of avoiding adhesive attachment to the surface of the framework during production vulcanization, reduce production costs, and improve product quality competitiveness.

[0007] 2. Technical solution

[0008] To achieve the above purpose, the technical solution adopted by the present application is: a processing mold for preventing rubber framework bonding part framework surface glue is designed, which comprises an upper mold, a middle mold and a lower mold, and the upper mold, the middle mold and the lower mold enclose a cylindrical cavity. The lower mold surface in the cavity is annular, with a convex lower mold core in the middle, a lower mold inner groove closely attached to the lower mold core without contact, and a lower mold outer groove closely attached to the outer circle of the lower mold surface without contact.

[0009] The framework is placed on the lower mold surface, the lower mold inner groove is located below the framework closely attached to the inner circle, and the lower mold outer groove is located below the framework closely attached to the outer circle, so that the contact between the lower surface of the framework and the lower mold surface is converted from surface contact which is easy to produce gaps to annular line contact which is easier to seal.

[0010] Further, the upper mold core of the upper mold is in close contact with the lower mold core of the lower mold; the upper mold core has a flange at the top end, and the upper mold core flange is pressed against the skeleton on the lower mold surface.

[0011] Further, the shape of the lower mold inner groove and the lower mold outer groove is set according to the shape of the skeleton; the projection edge of the skeleton on the lower mold surface is closely attached without contact.

[0012] Further, the chamfer of the lower mold inner groove is 0.3-0.7mm; the distance between the lower mold inner groove and the inner circle of the cavity is 0.2-0.4mm; the chamfer of the lower mold outer groove is 0.3-0.7mm; the distance between the lower mold outer groove and the outer circle of the cavity is 0.2-0.4mm.

[0013] Further, the parting surface of the upper mold, the middle mold, and the lower mold has a knife slot along the cavity of the product, and the knife slot closely attaches to the cavity without entering the cavity.

[0014] Further, the diameter of the knife slot is 0.8-1.5mm, and the distance between the edge of the knife slot and the cavity is 0.1-0.3mm.

[0015] Further, the cylindrical cavity of the cavity has a contraction ring in the middle part.

[0016] Further, the skeleton is a metal flat gasket with a thickness of 0.8-3.0mm.

[0017] Further, the upper mold has multiple single array upper mold plates; the lower mold has multiple single array lower mold plates; the middle mold has multiple single arrays arranged into middle mold strips, and the middle mold strips constitute the surrounding wall of the cavity when clamped, and facilitate product demolding when unclamped.

[0018] Preferably, the upper mold core is in close contact with the lower mold, and the mold core does not undergo the traditional interference pressing of 0.03-0.05mm, preventing indentation on the surface of the skeleton after vulcanization. The shape of the lower mold inner groove and the lower mold outer groove can be adjusted according to the shape of the skeleton.

[0019] The processing method for processing the rubber skeleton bonding piece using the above mold has the following steps:

[0020] (1) The upper mold, the middle mold, and the lower mold are installed on the vulcanizing machine, the mold temperature is set to 165-185℃, after the temperature reaches, the skeleton (400) is placed on the lower mold surface of the lower mold in the cavity, and the middle mold and the lower mold are clamped;

[0021] (2) Then, the rubber blank is filled into the middle mold clamping part of the cavity;

[0022] (3) press 16-20 MPa to close the mold, in the process of closing the mold, the hot glue is pressed to form a flowable adhesive flowing into the cavity; at the same time, the adhesive is bonded with the skeleton under the heat vulcanization and flows with the cavity, at this time, the groove design of the lower mold tightly presses the metal skeleton to form a closed loop, the adhesive cannot flow to the lower surface of the skeleton, thereby the process of removing the adhesive attached to the surface of the skeleton is omitted;

[0023] (4) after vulcanization for 5-10 minutes, separate the upper mold and the middle mold;

[0024] (5) separate the middle mold and the lower mold, open the mold cavity, and take out the rubber skeleton bonding piece;

[0025] (6) the knife slot is pulled to quickly remove the flash formed by the gap between the parting surfaces of the rubber skeleton bonding piece, and a finished product with a smooth surface is obtained.

[0026] 3. Beneficial effects

[0027] The technical scheme provided by the present application has the following remarkable effects:

[0028] (1) The introduction of the inner groove of the lower mold and the outer groove of the lower mold in the processing mold changes the surface contact sealing of the lower surface of the metal skeleton and the lower mold surface from the gap-prone surface contact sealing to the more easily sealed ring-type line contact sealing. The adhesive cannot flow to the surface of the metal skeleton, thereby the process of removing the adhesive attached to the surface of the metal skeleton is omitted, the production efficiency is greatly improved, and the production cost is reduced. The introduction of the inner groove of the lower mold and the outer groove of the lower mold also has another function: providing a small amount of overflow adhesive accommodating cavity. Even if there is an operation error, a small amount of adhesive overflowed outside the cavity is all absorbed in the inner groove of the lower mold and the outer groove of the lower mold, and will not diffuse along the gap between the outer surface of the skeleton and the lower mold surface. Without the groove, the gap capacity between the outer surface of the skeleton and the lower mold surface is small, and a small amount of overflow causes large-area pollution.

[0029] (2) The processing mold of the present application opens a knife slot along the product cavity at each parting surface. The knife slot is in close contact with the cavity without entering the cavity. The rubber flows into the pull strip at the knife slot, the flash formed by a small amount of overflow rubber at the product parting surface is connected in series, the pull strip is pulled, the flash is quickly removed, and a finished product with a smooth surface is obtained.

[0030] (3) The processing method of the present application greatly enhances the stability of the appearance quality of the product, improves the cleanliness of the product, and avoids the risk of skeleton damage caused by the traditional mold design during the "erasing" process in the subsequent process. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a schematic diagram of the lower mold and the middle mold assembly structure of the present application;

[0032] Figure 2 Assemble the rear edge of the lower mold, middle mold and upper mold of the present invention Figure 1 The AA section is a schematic diagram of the local structure;

[0033] Figure 3 Schematic diagram of the mold structure of the present invention;

[0034] Figure 4 This is a cross-sectional view of the middle mold of the present invention along the BB section;

[0035] Figure 5 It is a schematic diagram of the lower die surface structure of the present invention.

[0036] Explanation of the numbers in the schematic diagram: upper mold 100, middle mold 200, lower mold 300, cavity 201, skeleton 400, upper mold core 101, lower mold core 301, blade groove 102, middle mold blade groove 202, middle mold convex ring 203, middle mold positioning groove 204, lower mold blade groove 302, lower mold positioning rail 303, lower mold inner groove 304, lower mold outer groove 305. DETAILED DESCRIPTION

[0037] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0038] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology. They are not used to limit the conditions for implementation of the present invention and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Example 1

[0041] like Figures 1-5 As shown in the figure, a processing mold for preventing adhesive from sticking to the surface of a rubber skeleton adhesive component of this embodiment comprises an upper mold 100, a middle mold 200, and a lower mold 300, which together form a cylindrical cavity 201. The lower mold surface of the lower mold 300, located within the cavity 201, is annular, with a raised lower mold core 301 in the center. An inner groove 304 is provided, which is close to but not in contact with the lower mold core 301, and an outer groove 305 is provided, which is close to but not in contact with the outer ring of the lower mold surface.

[0042] The shape of the lower mold inner groove 304 and the lower mold outer groove 305 is determined according to the shape of the skeleton 400. The skeleton 400 is placed on the lower mold surface, the lower mold inner groove 304 is located below the skeleton 400 and closely contacts the inner circle, and the lower mold outer groove 305 is located below the skeleton 400 and closely contacts the outer circle. That is, the groove closely contacts the projected edge of the skeleton 400 on the lower mold surface without contacting it.

[0043] More specifically, the distance between the groove edge of the lower mold inner groove 304 and the inner circle of the cavity 201 is 0.3 mm, and the distance between the groove edge of the lower mold outer groove 305 and the outer circle of the cavity 201 is 0.3 mm. Both groove edges are chamfered by 0.5 mm. The determination of this set of data range not only takes into account the sealing effect of the groove edge and the lower surface of the skeleton, but also considers the mechanical strength of the groove edge and the stress strength of the edge of the lower surface of the skeleton. If the distance from the edge is too close, the groove edge and the edge of the lower surface of the skeleton may be damaged due to the necessary sealing pressure.

[0044] The above structure design converts the contact between the lower surface of the skeleton 400 and the lower mold surface from a face contact that is easy to produce gaps into a ring-type line contact that is easier to seal. At the same time, it also provides a small space for accommodating excess adhesive, effectively preventing the spread of adhesive.

[0045] At the same time, the upper mold core 101 of the upper mold 100 and the lower mold core 301 of the lower mold 300 are in close contact; the upper mold core 101 has a flange at the top end, and the upper mold core flange presses the skeleton 400 located on the lower mold surface. The close fit of the mold core here, as well as the pressing fit of the flange and the skeleton, effectively prevents the overflow of adhesive.

[0046] The processing method for processing the rubber skeleton bonding piece by using the above mold is as follows:

[0047] (1) The upper mold 100, the middle mold 200, and the lower mold 300 are installed on the vulcanizing machine, the mold temperature is set to 165℃, and after the temperature reaches, the skeleton 400 is placed on the lower mold surface of the lower mold 300 in the cavity 201, and the middle mold 200 and the lower mold 300 are closed;

[0048] (2) Then, the rubber blank is filled into the middle mold 200 at the joint of the cavity 201;

[0049] (3) The pressure is increased to 18MPa to close the mold, and in the process of closing the mold, the hot rubber under pressure forms a flowable adhesive that flows into the cavity 201; at the same time, the adhesive is bonded with the skeleton under the action of heat vulcanization and flows with the cavity, at this time, the groove design of the lower mold 300 tightly presses the metal skeleton to form a closed loop, and the adhesive cannot flow to the lower surface of the skeleton 400, thereby eliminating the process of removing the adhesive attached to the surface of the skeleton 400;

[0050] (4) After vulcanization for 7 minutes, the upper mold 100 and the middle mold 200 are separated;

[0051] (5) Separate the middle mold 200 and the lower mold 300, open the mold cavity, and take out the rubber framework bonding piece.

[0052] Preferably, the upper mold core is in close contact with the lower mold. The lower mold inner groove 304 and the lower mold outer groove 305 are circular in shape, and the framework 400 is a 1mm-thick annular metal flat gasket.

[0053] The rubber framework bonding piece obtained in the embodiment has the following remarkable effects:

[0054] (1) The processing mold of the present application makes the adhesive unable to flow to the surface of the metal framework, thereby eliminating the process of removing the adhesive attached to the surface of the metal framework, greatly improving the production efficiency and reducing the production cost.

[0055] (2) The processing method of the present application greatly enhances the stability of the appearance quality of the product, improves the cleanliness of the product, and at the same time avoids the risk of damage to the framework during the "erasing" process in the subsequent process caused by the traditional mold design.

[0056] Example 2

[0057] On the basis of Example 1, another implementation is adjusted, the lower mold inner groove 304 is 0.2mm away from the inner circle of the cavity 201, the lower mold outer groove 305 is 0.2mm away from the outer circle of the cavity 201, and the chamfer of the groove edge is 0.3mm.

[0058] Further preferably, a knife slot 102 is opened along the product cavity 201 at the parting surface of the upper mold 100, the middle mold 200, and the lower mold 300, and the knife slot 102 is in close contact with the cavity 201 without entering the cavity 201. The diameter of the knife slot 102 is 1.2mm, and the edge of the knife slot 102 is 0.2mm away from the edge of the cavity 201.

[0059] The knife slot 102 is in close contact with the cavity 201 without entering the cavity, and the pull strip is formed at the knife slot due to the flow of rubber, so that the flash formed by a small amount of overflow rubber at the parting surface of the product is connected in series, the pull strip is pulled, the flash is quickly removed, and a finished product with smooth surface is obtained.

[0060] The processing method for processing the rubber framework bonding piece by using the above mold has the following steps:

[0061] (1) The upper mold 100, the middle mold 200, and the lower mold 300 are installed on the vulcanizing machine, the mold temperature is set to 185℃, after the temperature reaches, the framework 400 is placed on the lower mold surface of the lower mold 300 in the cavity 201, and the middle mold 200 and the lower mold 300 are combined;

[0062] (2) The rubber blank is filled into the middle mold 200 at the combined part of the cavity 201;

[0063] (3) pressurize 20 MPa to close the mold, in the process of closing the mold, the hot rubber is pressed to form a flowable adhesive to flow into the cavity 201; at the same time, the adhesive is bonded with the skeleton under the action of heat vulcanization and flows with the cavity, at this time, the groove design of the lower mold 300 tightly presses the metal skeleton to form a closed loop, the adhesive cannot flow to the lower surface of the skeleton 400, thereby omitting the process of removing the adhesive attached to the surface of the skeleton 400;

[0064] (4) after vulcanization for 10 minutes, separate the upper mold 100 and the middle mold 200;

[0065] (5) separate the middle mold 200 and the lower mold 300, open the mold cavity, and take out the rubber skeleton bonding piece;

[0066] (6) the knife slot 102 is pulled to remove the flash formed by the gap between the parting surfaces of the rubber skeleton bonding piece, and a finished product with a smooth surface is obtained.

[0067] Preferably, the upper mold core is in close contact with the lower mold. The shape of the inner groove of the lower mold and the outer groove of the lower mold is a circular ring, and the skeleton is a ring-shaped ceramic flat gasket with a thickness of 0.8 mm.

[0068] Example 3

[0069] On the basis of example 1, a knife slot 102 is opened on the parting surface of the upper mold 100, the middle mold 200 and the lower mold 300 along the cavity 201 of the product, and the knife slot 102 is in close contact with the cavity 201 without entering the cavity 201. The diameter of the knife slot 102 is 0.8 mm, and the edge of the knife slot 102 is 0.1 mm away from the edge of the cavity 201.

[0070] As another embodiment, according to the toughness of different rubber varieties, the diameter of the knife slot 102 can also be set to 1.5 mm, and the edge of the knife slot 102 is 0.3 mm away from the edge of the cavity 201.

[0071] In order to improve the production efficiency, further, a plurality of single arrays of upper mold plates are arranged on the upper mold 100; a plurality of single arrays of lower mold plates are arranged on the lower mold 300; and a plurality of single arrays of middle mold strips are arranged on the middle mold 100, and the middle mold strips are combined to form the surrounding wall of the cavity 201, and the middle mold 100 is opened to facilitate the demolding of the product. The design of the middle mold 100 arranged in the form of a middle mold strip and the opening and closing of the middle mold strip enables the rubber bonding piece provided with a shrink ring in the middle part of the cylindrical cavity of the cavity 201 to be smoothly demolded according to the structural needs of the rubber bonding piece.

[0072] The processing method of the rubber skeleton bonding piece using the above mold is as follows:

[0073] (1) The upper mold 100, the middle mold 200 and the lower mold 300 are installed on a vulcanizing machine, the mold temperature is set to 180℃, and after the temperature reaches, the framework 400 is placed on the lower mold surface of the lower mold 300;

[0074] (2) The rubber blank is filled into the cavity 201 again;

[0075] (3) The mold is closed under pressure of 16 MPa, in the process of closing the mold, the hot rubber material forms a flowable adhesive under pressure and flows into the cavity 201; at the same time, the adhesive is bonded with the framework under heat vulcanization and flows with the cavity, at this time, the groove design of the lower mold 300 tightly presses the metal framework to form a closed loop, the adhesive cannot flow to the lower surface of the framework 400, thereby the process of removing the adhesive attached to the surface of the framework (400) is omitted;

[0076] (4) After vulcanization for 5 minutes, the upper mold 100 and the middle mold 200 are separated;

[0077] (5) The middle mold 200 and the lower mold 300 are separated, the mold cavity is opened, and the rubber framework bonding piece is taken out;

[0078] (6) The knife slot 102 is pulled to remove the flash of the rubber framework bonding piece caused by the gap between the parting surfaces, and a smooth finished product is obtained.

[0079] Preferably, the upper mold core is in close contact with the lower mold. The shape of the inner groove of the lower mold and the outer groove of the lower mold is a rectangular ring, and the metal framework is a flat gasket with a thickness of 3.0 mm.

[0080] The above describes the present application and its embodiments in a schematic manner, which is not restrictive, and the drawings only show one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired thereby, without departing from the purpose of the present application, similar structural modes and embodiments can be designed without creativity, which should all belong to the protection scope of the present application.

Claims

1. A mold for preventing rubber skeleton adhesion component skeleton surface glue processing, comprising an upper mold (100), a middle mold (200), and a lower mold (300), the upper mold (100), the middle mold (200), and the lower mold (300) enclose a cylindrical cavity (201), characterized in that: the lower mold face of the lower mold (300) in the cavity (201) is ring-shaped, with a convex lower mold core (301) in the middle, a lower mold inner groove (304) closely attached to the lower mold core (301) without contact, and a lower mold outer groove (305) closely attached to the outer circle of the lower mold face without contact; the upper mold core (101) of the upper mold (100) is in close contact with the lower mold core (301) of the lower mold (300); the upper mold core (101) has a flange at the top end, which presses the skeleton (400) on the lower mold face; the skeleton (400) is placed on the lower mold face, the lower mold inner groove (304) is closely attached to the inner circle below the skeleton (400), and the lower mold outer groove (305) is closely attached to the outer circle below the skeleton (400), with the grooves closely attached to the projected edge of the skeleton on the lower mold face without contact, so that the contact between the lower surface of the skeleton (400) and the lower mold face is converted from surface contact to ring-shaped line contact; the shape of the lower mold inner groove (304) and the lower mold outer groove (305) is determined according to the shape of the skeleton (400); the grooves are closely attached to the projected edge of the skeleton (400) on the lower mold face without contact; the distance between the groove edge of the lower mold inner groove (304) and the inner circle of the cavity (201) is 0.2-0.4 mm; the chamfer of the groove edge of the lower mold inner groove (304) is 0.3-0.7 mm; the distance between the groove edge of the lower mold outer groove (305) and the outer circle of the cavity (201) is 0.2-0.4 mm; and the chamfer of the groove edge of the lower mold outer groove (305) is 0.3-0.7 mm.

2. The mold of claim 1, wherein: a contraction ring is arranged in the middle of the cylindrical cavity of the cavity (201).

3. The mold of claim 1, wherein: the parting surface of the upper mold (100), the middle mold (200), and the lower mold (300) has a knife slot (102) along the cavity (201) of the product, which closely attaches to the cavity (201) without entering the cavity (201).

4. The mold of claim 3, wherein: the diameter of the knife slot (102) is 0.8-1.5 mm, and the distance between the edge of the knife slot (102) and the edge of the cavity (201) is 0.1-0.3 mm.

5. The mold of claim 1, wherein: the skeleton (400) is a metal flat gasket with a thickness of 0.8-3.0 mm.

6. The mold of claim 1, wherein: a plurality of single array upper mold plates are arranged on the upper mold (100); a plurality of single array lower mold plates are arranged on the lower mold (300); and a plurality of single arrays are arranged as middle mold strips on the middle mold (200), which form the surrounding wall of the cavity (201) when closed and facilitate product demolding when opened. 7.A processing method for preventing rubber skeleton adhesion component skeleton surface glue, using the mold of any one of claims 1-6, comprising the following steps: (1) The upper mold (100), the middle mold (200), and the lower mold (300) are installed on a vulcanizer, and the mold temperature is set to 165~185℃. After the temperature is reached, the skeleton (400) is placed on the lower mold surface of the lower mold (300) in the cavity (201), and the middle mold (200) and the lower mold (300) are closed; (2) The rubber blank is then filled into the cavity (201) and the center mold (200); (3) Pressurizing the upper mold (100) at 16-20 MPa, during the mold closing process, the hot glue is pressurized to form a fluid adhesive that flows into the mold cavity (201); at the same time, the adhesive adheres to the skeleton under heat vulcanization and flows along the mold cavity. At this time, the groove design of the lower mold (300) tightly presses the metal skeleton to form a closed loop, and the adhesive cannot flow to the lower surface of the skeleton (400), thereby eliminating the process of removing the adhesive from the surface of the skeleton (400); (4) After vulcanization for 5 to 10 minutes, separate the upper mold (100) and the middle mold (200); (5) Separate the middle mold (200) and the lower mold (300), open the mold cavity, and remove the rubber skeleton bonding part; (6) A pulling strip is formed at the knife edge groove (102) due to the inflow of rubber. The pulling strip is pulled to quickly remove the flash formed by the gap between the parting surfaces of the rubber skeleton bonding parts, thereby obtaining a finished product with a smooth surface.

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