Secondary molding mold structure
By setting positioning cavities and cooling pipes at the ends of pre-formed plastic parts, combined with ejector pins and core designs, the problems of insufficient sealing and difficult demolding during secondary molding are solved, achieving efficient secondary molding and improving yield.
Patent Information
- Application Number
- CN202422676133.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-04
AI Technical Summary
During the secondary molding process, insufficient sealing between the mold and the pre-placed plastic parts leads to glue overflow. Furthermore, the pre-placed plastic parts are not completely cooled under high temperature and are stretched and deformed, making it difficult to demold smoothly and affecting the yield of secondary molding products.
Positioning cavities and cooling pipes are set at the ends of pre-placed plastic parts to form a well-sealed molding cavity. Rapid cooling and smooth demolding are achieved through the cooperation of ejector pins and cores.
To avoid or reduce burrs, improve the yield rate of secondary molding, ensure that pre-placed plastic parts are not stretched or deformed, and improve production efficiency.
Smart Images
Figure CN223520079U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a plastic mould technical field, especially a kind of secondary forming mould structure. BACKGROUND
[0002] In order to reduce assembly cost while improving product quality, more and more composite plastic products use secondary forming process, that is, the molded plastic part is put into the mold cavity again and the glue is poured on the specific area to form a whole with the original plastic part. However, in actual application and production, the secondary forming process is prone to difficult demolding and burr at the joint. The main reason is that the secondary forming cavity formed between the mold and the pre-plastic has poor sealing, which causes glue overflow, and the pre-plastic part is not fully cooled before being pushed away by the high temperature of the secondary formed plastic part, resulting in sticking to the mold and being pulled and deformed. SUMMARY
[0003] To solve the above problems in the prior art, the utility model provides a secondary forming mould structure, which can form a forming cavity with good sealing and matching the secondary forming structure around the end of the pre-plastic part, to avoid or reduce burr phenomenon, and a cooling pipeline is provided beside the pre-plastic part to avoid sticking of the pre-plastic part to the mold during demolding, thereby improving the secondary forming yield.
[0004] To solve the above technical problems, the utility model adopts a technical scheme as follows:
[0005] A secondary forming mould structure, the mould includes a fixed mold and a movable mold, a fixed mold pin is provided on the fixed mold, and a movable mold pin and a plurality of ejector pins are provided on the movable mold. The end of the plurality of ejector pins extends to the movable mold pin and can be driven by external force to lift the plastic part on the movable mold pin. Wherein:
[0006] The end of the movable mold pin towards the fixed mold pin is provided with a positioning cavity for fixing the pre-plastic part. A plurality of ejector pins can pass through the movable mold pin and extend into the positioning cavity. A cooling pipeline is formed on the movable mold, one end of the cooling pipeline passes through the movable mold pin and extends into the positioning cavity to abut against the pre-plastic part.
[0007] A forming plate and a core are provided on the fixed mold pin. The forming plate is embedded on the end of the fixed mold pin towards the movable mold pin, and a cavity adapted to the secondary forming structure is formed on the forming plate. The core passes through the cavity in the closing direction and extends into the positioning cavity. A flow channel for glue feeding is provided on the side of the cavity on the fixed mold pin and the forming plate. The flow channel is connected with the positioning cavity or a hidden flow channel when the mold is closed. The hidden flow channel is connected with the side wall of the positioning cavity.
[0008] Further description of the above technical solution:
[0009] In the technical scheme, the depth of the positioning cavity is greater than the height / thickness of the preset plastic part.
[0010] In the technical scheme, the positioning cavity is further provided with a support, the preset plastic part is clamped on the support, the depth of the positioning cavity is greater than the sum of the height / thickness of the support and the preset plastic part, and the cooling pipeline is attached to the support or extends into the support.
[0011] In the technical scheme, the end of the forming plate towards the fixed die core is further provided with a positioning groove, the positioning groove is in communication with the cavity, and the contour projection of the positioning groove falls on the periphery of the cavity; the core comprises a stepped guiding portion and a forming portion, and the guiding portion is matched with the positioning groove.
[0012] In the technical scheme, the outer wall of the forming portion is provided with a protrusion matched with the secondary forming structure, and the protrusion extends into the positioning cavity during clamping.
[0013] In the technical scheme, the movable die core is formed with more than one positioning cavity, the forming plate is formed with a plurality of cavities matched with the positioning cavities one by one, the fixed die core is formed with a plurality of cores matched with the cavities one by one, and each cavity is provided with a runner on the side.
[0014] In the technical scheme, each positioning cavity is in communication with more than one first hole groove and second hole groove arranged on the movable die core, each first hole groove is matched with the cooling pipeline, and each second hole groove is matched with a ejector pin.
[0015] Compared with the prior art, the beneficial effects of the utility model lie in that the positioning cavity for fixing the preset plastic part is arranged on the movable die, the cavity and the core are arranged on the fixed die core, the forming cavity body matched with the secondary forming structure and having good airtightness can be enclosed on the periphery of the end of the preset plastic part, the burr phenomenon is avoided or reduced, the cooling pipeline extends to the preset plastic part or the side of the preset plastic part, the temperature of the preset plastic part is quickly reduced after the secondary forming is completed, the preset plastic part is prevented from being adhered to the movable die core, the preset plastic part with the secondary forming structure formed on the end is smoothly pushed away from the movable die core by the cooperation of the ejector pin, the preset plastic part is prevented from being damaged, and the yield of the secondary forming is improved. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is the exploded structural schematic view of the movable die core and the fixed die core during clamping of the embodiment;
[0017] Figure 2 is the structural schematic view of the fixed die core in the embodiment.
[0018] In the figure: 10, fixed die; 20, movable die; 30, ejector pin; 40, pre-plastic part; 50, cooling pipeline; 60, secondary forming structure; 70, support; 1, positioning cavity; 2, forming plate; 3, core; 301, guide part; 302, forming part; 303, protrusion; 4, cavity; 5, runner; 6, positioning groove. DETAILED DESCRIPTION
[0019] The utility model will be described in further detail below with reference to the drawings.
[0020] The embodiments described with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. In the description of the present application, it is understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "several" and "multiple" is two or more than two, unless otherwise explicitly specified and limited. In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the indirect contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.
[0021] As Figure 1 shown in the figure, a kind of overmolding mold structure, mold includes fixed mould and movable mould, fixed mould is equipped with mould insert 10, movable mould is equipped with movable mould insert 20 and several ejector pins 30, the end of several ejector pins 30 extends to movable mould insert 20 and can be driven by external force to lift the plastic part on movable mould insert 20;Wherein:
[0022] the end of movable mould insert 20 towards fixed mould insert 10 is equipped with the positioning cavity 1 for fixing pre-plastic part 40;Several ejector pins 30 can pass through movable mould insert 20 and extend into the positioning cavity 1;Cooling line 50 is formed on movable mould, one end of cooling line 50 passes through movable mould insert 10 and extends into the positioning cavity 1 to abut on pre-plastic part 40;Positioning cavity 1 is also equipped with support 70, pre-plastic part 40 is matched and clamped on support 70, the depth of positioning cavity 1 is greater than the height / thickness of support 70 and pre-plastic part 40;Cooling line 50 abuts on support 70 or extends to its inside.In application, according to the structural characteristics of pre-plastic part 40, it can also be directly placed in the positioning cavity 1, and the depth of the positioning cavity 1 is greater than the height / thickness of the pre-plastic part 40.
[0023] mould insert 10 is equipped with forming plate 2 and core 3, forming plate 2 is embedded on the end of fixed mould insert 10 towards movable mould insert 20, and the forming plate 2 is formed with the cavity 4 adapted to the overmolding structure 60, the core 3 passes through the cavity 4 and extends into the positioning cavity 1 along the clamping direction;Fixed mould insert 10 and forming plate 2 are equipped with runner 5 for feeding glue on the side of cavity 4, runner 5 is connected with positioning cavity 1 or with potential runner when clamping, and the potential runner is connected with the side wall of positioning cavity 1;The end of forming plate 2 towards fixed mould insert 10 is also equipped with positioning groove 6, the positioning groove 6 is communicated with the cavity 4, and the contour projection of the positioning groove 6 falls on the periphery of the cavity 4.
[0024] As Figure 2 shown in the figure, the core 3 includes the stepped guide part 301 and the forming part 302, and the guide part 301 is adapted to the positioning groove 6.In this embodiment, the pre-plastic part 40 and the overmolding structure 60 are both annular structures, the forming part 302 is adapted to the cavity 4, and the outer wall of the forming part 302 is equipped with the protrusion 303 adapted to the overmolding structure, and the protrusion 303 extends into the positioning cavity 1 when clamping.
[0025] As Figure 1 shown in the figure, in this embodiment, the movable mould insert 20 is formed with more than one positioning cavity 1, the forming plate 2 is formed with several cavities 4 adapted to the positioning cavities 1 one by one, the fixed mould insert 10 is formed with several cores 3 adapted to the cavities 4 one by one, and each cavity 4 is equipped with a runner 5 on the side thereof;Each positioning cavity 1 is communicated with more than one first hole groove and second hole groove provided on the movable mould insert 20, each first hole groove is adapted to the cooling line 50, and each second hole groove is adapted to an ejector pin 30.
[0026] In operation, the preset plastic part 40 is placed in the positioning cavity 1 or on the support 70, one end of the preset plastic part 40 or the support 70 is close to or connected with the cooling pipeline 50 on the movable die, the mold is closed, the movable die core 20 is buckled with the fixed die core 10 and the forming plate 2, at this time, the cavity 4 is matched with the outer periphery of the end of the existing plastic 40, the forming part 302 on the core 3, the end of the preset plastic part 40, the inner wall of the positioning cavity 1 and the outer wall of the guide part 301 jointly enclose a cavity adapted to the secondary forming structure 60, the glue flows to the preset plastic part 40 through the runner 5 and fills the cavity to form. After completion, the cooling pipeline 50 cools the preset plastic part 40 or indirectly cools the preset plastic part 40 through the cooling support 70, and the ejector pin 30 ejects it from the movable die core 20.
[0027] The utility model discloses a positioning cavity 1 for fixing the preset plastic part 40 is arranged on the movable die, and the cavity 4 and the core 3 are arranged on the fixed die core 10, the molding cavity that is matched with the secondary forming structure 60 and the better airtightness of the peripheral enclosure of the end of the preset plastic part 40 can be formed, the burr phenomenon is avoided or reduced, and the cooling pipeline 50 is extended to the preset plastic part 40 or the side, the temperature of the preset plastic part 40 can be quickly reduced after the secondary forming is completed to avoid or reduce the adhesion with the movable die core 20, and the preset plastic part 40 with the secondary forming structure 60 formed on the end can be smoothly pushed away from the movable die core 60 by cooperating with the ejector pin 30, the preset plastic part 40 is avoided to be damaged, and the secondary forming yield is improved.
[0028] The above is not any limitation on the technical range of the utility model, any modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model still belong to the range of the technical scheme of the utility model.
Claims
1. A structure of a secondary molding die, the die comprising a fixed die and a movable die, the fixed die being provided with a fixed die core, the movable die being provided with a movable die core and a plurality of ejector pins, the end portions of the plurality of ejector pins extending into the movable die core and being capable of driving the movable die core to eject a molded part therefrom; characterized in that: the end portion of the movable die core facing the fixed die core is provided with a positioning cavity for fixing a pre-molded part; the plurality of ejector pins are capable of extending into the positioning cavity through the movable die core; the movable die is provided with a cooling pipeline, one end portion of the cooling pipeline extending into the positioning cavity through the movable die core to abut against the pre-molded part; the fixed die core is provided with a forming plate and a core, the forming plate being embedded in the end portion of the fixed die core facing the movable die core and being provided with a cavity adapted to the secondary molding structure, the core extending into the positioning cavity through the cavity in the closing direction; the fixed die core and the forming plate are provided with a runner for feeding plastic material on the side of the cavity, the runner being connected to the positioning cavity or a hidden runner in the closed state, the hidden runner being connected to the side wall of the positioning cavity. The depth of the positioning cavity is greater than the height / thickness of the pre-molded part.
2. A structure molded by overmolding according to claim 1, wherein The positioning cavity is further provided with a support, the pre-molded part being fixedly fitted on the support, the depth of the positioning cavity being greater than the sum of the height / thickness of the support and the pre-molded part; the cooling pipeline abuts against or extends into the support.
3. The overmolded structure of claim 1, wherein The end portion of the forming plate facing the fixed die core is further provided with a positioning groove, the positioning groove being connected to the cavity and having an outline projection falling on the periphery of the cavity; the core comprises a base and a forming portion arranged in a stepped manner, the base being adapted to the positioning groove, and the forming portion being adapted to the cavity.
4. The overmolded structure of claim 1, wherein The outer wall of the forming portion is provided with a protrusion adapted to the secondary molding structure, the protrusion extending into the positioning cavity in the closed state.
5. A structure molded by overmolding according to claim 4, wherein The movable die core is provided with more than one positioning cavity, the forming plate is provided with a plurality of cavities adapted to the positioning cavities one by one, the fixed die core is provided with a plurality of cores adapted to the cavities one by one, and each cavity is provided with a runner on the side thereof.
6. A two-shot moulded structure according to any one of claims 1 to 5, wherein, Each positioning cavity is connected to more than one first hole and a second hole provided on the movable die core, each first hole is adapted to the cooling pipeline, and each second hole is adapted to an ejector pin.
7. A structure molded by overmolding according to claim 6, wherein