Burr-proof boss structure on large-size flat plate and forming die structure of burr-proof boss structure

Abstract

The utility model discloses an anti-burr boss structure on a large-size flat plate and a forming die structure of the anti-burr boss structure, a positioning end of a boss on the large-size flat plate is provided with a first inclined surface, and a forming part of a core-pulling piece on the upper side of a forming die is provided with a matched second inclined surface. According to the utility model, the positioning surface of the flat plate is the inclined surface, so that the function and the appearance of the flat plate are not influenced, the production and assembly cost of the flat plate is not increased, and the side core-pulling piece for forming the structure on the plastic film is also provided with the matched inclined surface, so that the assembly production of the mold is not influenced, and the manufacturing cost of the mold is not increased; the friction of relative movable parts on the parting surface can be relieved under the condition of the same machining precision and assembly precision, so that the problems of flash and residual burrs on a product in molding production are avoided and reduced, and meanwhile, the mold cleaning time caused by the flash and the mold abrasion problem caused by the fact that the flash is not cleaned up can be shortened; the service life of key components on the die is prolonged, and the production efficiency of the die can be improved.

Description

Technical Field

[0001] This utility model relates to the field of plastic mold technology, and in particular to the anti-burr boss structure on a large-size flat plate and its molding mold structure. Background Technology

[0002] For ease of use, large-sized flat plastic parts typically have bosses on their side walls. The upper surface of the boss usually serves as an appearance surface or a functional mating surface, while the lower surface serves as a positioning surface or a control / avoidance surface. In mold design, considering the product's purpose and the mold's own structure, a side-pulling slider structure is generally set around the cavity of the moving mold to form the bosses on the side walls and the positioning hole groove structure on the side walls, so that the parting surface of the molded product rests on the lower end face of the boss. However, in actual production, because the dimension of the side-pulling slider in one direction is relatively very large, the machining accuracy during manufacturing and assembly, the accumulation of assembly tolerances, and the deviations in direction and displacement during the sliding process will all affect its relative position deviation with the cavity when the mold is closed, which can easily lead to burrs on the parting surface of the product during molding.

[0003] There are too many interconnected structures and assembly relationships on the mold. Currently, the burr problem of such structural products has been difficult to solve economically and effectively in the molding production. Generally, a deburring process is added after molding, which is time-consuming and labor-intensive, and it is difficult to reduce production costs. Utility Model Content

[0004] To address the problems existing in the prior art, this utility model provides a large-size flat plate anti-burr boss structure and its forming mold structure. It does not increase the production and assembly costs of the product and the mold, but reduces the friction between relatively moving parts on the parting surface under the same processing and assembly precision, thereby avoiding and reducing the problems of overflow and residual burrs on the product during molding production. At the same time, it can reduce the mold cleaning time caused by overflow and the mold wear caused by incomplete overflow cleaning, improve the service life of key components on the mold, and improve the production efficiency of the mold.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A large-size flat plate has an anti-burr edge protrusion structure, wherein one or more positioning protrusions extending outward are formed on the outer contour sidewall of the flat plate; the end face of each positioning protrusion facing away from the outer surface is a first inclined surface, and each first inclined surface extends inclinedly away from the positioning protrusion from the outer edge of the positioning protrusion.

[0007] As a further explanation of the above technical solution:

[0008] In the above technical solution, the inclination angle of each of the first inclined planes is between 1.5° and 4°.

[0009] One technical solution adopted by this utility model is as follows:

[0010] A molding die structure for anti-burr protrusions on a large-size flat plate, wherein the molding die is provided with a moving die and a fixed die; the end of the moving die facing the fixed die forms a cavity adapted to the large-size flat plate described in the previous technical solution; two or more side core pullers are slidably provided on the moving die around the cavity; each side core puller has several forming parts at its end facing the cavity that are adapted to one side wall of the flat plate and can match and engage with several positioning protrusions one by one; the side wall of each forming part facing the positioning protrusion is a second inclined surface adapted to the first inclined surface, and each second inclined surface has the same inclination angle as the first inclined surface; when the mold is closed and opened, external force can drive each side core puller to slide on the moving die, so as to move each forming part closer to or away from the cavity.

[0011] As a further explanation of the above technical solution:

[0012] In the above technical solution, each of the forming parts is further provided with a plurality of forming protrusions for forming positioning holes and grooves on the side wall of the forming plate. The side wall of each forming protrusion is a third inclined surface, and the inclination angle and inclination direction of each third inclined surface are the same as the inclination angle and inclination direction of the second inclined surface.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting the positioning surface of the flat plate as an inclined surface, this utility model will not affect its function and appearance, nor will it increase the production and assembly cost of the flat plate. By also setting a matching inclined surface on the side core-pulling part used to form the structure on the plastic film, it will not affect the assembly production of the mold, nor will it increase the manufacturing cost of the mold. However, under the same processing accuracy and assembly accuracy, it can reduce the friction between the relatively moving parts on the parting surface, thereby avoiding and reducing the problems of overflow and residual burrs on the product during molding production. At the same time, it can reduce the mold cleaning time caused by overflow and the mold wear caused by incomplete overflow cleaning, improve the service life of key components on the mold, and improve the production efficiency of the mold. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the flat plate structure in this embodiment;

[0015] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of BB;

[0016] Figure 3 yes Figure 2 Enlarged structural diagram of section C;

[0017] Figure 4 This is a schematic diagram of the structure of the flat plate and the side core-pulling component after the mold is closed and formed in this embodiment.

[0018] Figure 5 yes Figure 4 A schematic diagram showing the exploded structure of the core-pulling component and the flat plate on one side.

[0019] In the figure: 10, flat plate; 20, side core pull part; 2, positioning protrusion; 3, appearance surface; 4, first inclined surface; A, tilt angle; 5, forming part; 6, second inclined surface; 7, forming protrusion. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] The embodiments described with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as limiting this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] like Figure 1-3 The large-size flat plate has an anti-burr edge protrusion structure. One or more positioning protrusions 2 extending outward are formed on the outer contour sidewall of the flat plate 10. The end face of each positioning protrusion 2 facing away from the appearance surface 3 is a first inclined surface 4. Each first inclined surface 4 extends in an inclined direction away from the positioning protrusion 2, starting from the outer edge of the positioning protrusion 2.

[0023] Specifically, the inclination angle A of each first inclined plane 4 is between 1.5° and 4°.

[0024] In this embodiment, the tilt angle A is 3°. In application, an appropriate tilt angle A can be set according to the actual structure and size of the product.

[0025] like Figure 4-5 As shown, this utility model also discloses a molding die structure for forming anti-burr bosses on large-size flat plates. The molding die is provided with a moving die and a fixed die. The end of the moving die facing the fixed die is formed with a cavity adapted to the large-size flat plate 10 in the above embodiment. Two or more side core pullers 20 are slidably provided on the moving die around the cavity. The end of each side core puller 20 facing the cavity is provided with several forming parts 5 that are adapted to one side wall of the flat plate 10 and can be matched and engaged with several positioning protrusions 2 one by one. The side wall of each forming part 5 facing the positioning protrusion 2 is a second inclined surface 6 adapted to the first inclined surface 4. Each second inclined surface 6 has the same inclination angle A as the first inclined surface 4. When the mold is closed and opened, the external force can drive each side core puller 20 to slide on the moving die, so as to drive each forming part 5 to move closer to or away from the cavity.

[0026] It is understandable that, such as Figure 1 As shown, in this embodiment, the plastic flat plate is a middle plate used for support and positioning in large precision electronic products. Several positioning slots are formed on its body and side walls, such as... Figure 2-3 As shown, a positioning protrusion 2 for error-proof positioning is formed on its side wall. One end face of the positioning protrusion is the appearance surface 3, and the other end face needs to cooperate with other support plates to achieve the positioning of the middle plate. Therefore, the flatness of its end face is required to a high degree. However, the parting surface of the mold in the molding production is also located here. The burrs here directly affect the subsequent assembly quality of the product. This utility model sets the positioning end face on the plate 10 as an inclined surface, which will not affect its subsequent assembly positioning and can relatively increase the contact area between the plate and the support plate, thus ensuring its stability in the assembly. On the other hand, since the core-pulling part 20 on the upper side of the molding mold slides horizontally or vertically relative to the cavity on the moving mold, its movement can reduce the friction between the inclined third inclined surface and the cavity on the moving mold, thereby ensuring that the cavity is in a better closed state when the mold is closed, avoiding and reducing the occurrence of overflow, thereby avoiding and reducing the problem of residual burrs on the plate 10 after molding.

[0027] The structural design of the moving mold and the fixed mold on the plastic mold, as well as the action process and driving structure of the side core-pulling component on the moving mold, are common knowledge to those skilled in the art and are recorded in a large number of patent documents and related literature. Therefore, their specific structures will not be elaborated here.

[0028] This invention sets the positioning surface of the flat plate 10 as an inclined surface, which neither affects its function and appearance nor increases its production and assembly costs. By also setting a matching inclined surface on the side core-pulling part 20 used to form the structure on the plastic film, it neither affects the assembly and production of the mold nor increases the manufacturing cost of the mold. However, it can reduce the friction between the relatively moving parts on the parting surface under the same processing and assembly accuracy, thereby avoiding and reducing the problems of overflow and residual burrs on the product during molding production. At the same time, it can reduce the mold cleaning time caused by overflow and the mold wear caused by incomplete overflow cleaning, improve the service life of key components on the mold, and improve the production efficiency of the mold.

[0029] Furthermore, each forming part 5 is also provided with a number of forming protrusions 7 for positioning holes and grooves on the side wall of the forming plate 10, and each forming protrusion 7 is provided with a draft angle on its side wall.

[0030] like Figure 1 As shown, in this embodiment, the side wall of the plate 10 is also provided with several positioning holes and slots. The inclined side wall of the forming protrusion 7 on the mold can avoid or reduce the damage to the positioning holes and slots of the plastic parts when the mold is opened.

[0031] The above does not limit the technical scope of this utility model. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this utility model shall still fall within the scope of the technical solution of this utility model.

Claims

1. A burr-resistant boss structure on a large-size flat plate, wherein one or more positioning protrusions extending outward are formed on the outer contour sidewall of the flat plate; characterized in that: The end face of each positioning protrusion facing away from the outer surface is a first inclined surface, and each first inclined surface extends at an angle away from the outer edge of the positioning protrusion.

2. The anti-burr edge boss structure on a large-size flat plate according to claim 1, characterized in that, The inclination angle of each of the first inclined planes is between 1.5° and 4°.

3. A forming mold structure for anti-burr bosses on large-size flat plates, wherein the forming mold is provided with a moving mold and a fixed mold; characterized in that, The moving mold has a cavity at its end facing the fixed mold that is adapted to the large-sized flat plate as described in any one of claims 1-2. Two or more side core-pulling members are slidably provided on the moving mold around the cavity. Each side core-pulling member has a plurality of forming parts at its end facing the cavity that are adapted to one side wall of the flat plate and can be matched and engaged with a plurality of positioning protrusions. The side wall of each forming part facing the positioning protrusion is a second inclined surface adapted to the first inclined surface. Each second inclined surface has the same inclination angle as the first inclined surface. When the mold is closed and opened, an external force can drive each side core-pulling member to slide on the moving mold, so as to move each forming part closer to or away from the cavity.

4. The forming mold structure for the anti-burr boss on a large-size flat plate according to claim 3, characterized in that, Each of the forming parts is further provided with a plurality of forming protrusions for forming positioning holes and grooves on the side wall of the forming plate. The side wall of each forming protrusion is a third inclined surface, and the inclination angle and inclination direction of each third inclined surface are the same as the inclination angle and inclination direction of the second inclined surface.

Images