Front and back split type shell and its blister forming mold

Abstract

The utility model relates to a front and rear split type shell and blister forming die of plastic shell processing technical field, aims at solving the problem of exposed joint and difficult size control caused by the traditional blister process unable to realize the beautiful front and rear split structure. Its technical scheme main points are: the shell parting surface is arranged at the shape modeling boundary, the front shell adopts female die blister forming, the rear shell adopts the male die with the reverse structure and is formed through the bag suction process and is demoulded through the mode of stretching from the opening end two sides and taking off from bottom to top. The utility model is mainly used for manufacturing the electric appliance plastic shell with hidden joint and beautiful appearance.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic shell processing, and in particular to a front and rear split shell and its vacuum forming mold. Background Technology

[0002] In existing technologies, integral plastic shells generally adopt a design consisting of a left shell 1 / and right shell 2 / The splicing structural design is shown in the attached figure. Figure 1 As shown. This left-right split design is not for aesthetic or structural optimization, but mainly due to the limitations of traditional vacuum forming processes. When designing traditional vacuum forming molds, the primary consideration is the feasibility of vacuum forming and whether the product can be easily demolded from the mold. Therefore, any undercut structures are usually avoided in the mold design.

[0003] This left-right split structure results in the product seam being located on the main visual facade, severely impacting the overall aesthetics. Adopting a more aesthetically pleasing front-back split structure would present difficulties in demolding due to the naturally occurring inverted shape of the product, leading to a series of defects such as exposed seams, difficulty in controlling the mating dimensions, and challenges in surface treatment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a front and rear split shell and its vacuum forming mold, so as to solve the problem that traditional vacuum forming process cannot achieve an aesthetically pleasing front and rear split structure, as well as the resulting problems such as unsightly seams and poor dimensional accuracy.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a front and rear split shell, including a front shell and a rear shell, wherein the parting surface of the front shell and the rear shell is set at the boundary of the outer shape of the shell; the mating surface of the front shell and the rear shell at the parting surface is a mold surface that matches each other; the front shell is a component made by vacuum forming with a female mold; the rear shell is a component made by vacuum forming with a male mold having an undercut structure, and the rear shell has a shape corresponding to the undercut structure of the male mold.

[0006] To precisely define the position of the parting surface and ensure that the seam is concealed and integrated with the product's shape to the greatest extent possible, this invention further specifies that, in the above technical solution, the parting surface is located on a recessed portion or a protruding portion of the outer shell shape. By specifically defining the parting surface on the recessed or protruding portion of the shape, the seam is naturally hidden within the shape variation, disappearing visually, significantly improving the overall appearance and aesthetics of the product.

[0007] This utility model also provides a vacuum forming mold for manufacturing a front and rear split shell, including a front shell forming mold and a rear shell forming mold; the front shell forming mold is a female mold for forming the front shell; the rear shell forming mold is a male mold, and its mold body is provided with an inverted structure for forming the rear shell; the shape of the inverted structure is suitable for demolding by stretching the product outward from both sides of the opening end of the rear shell and removing the rear shell from the male mold from bottom to top.

[0008] To construct the undercut structure of the male mold, and to physically realize and ensure the smooth execution of the specific manual demolding method of stretching outwards from both sides, this invention further specifically defines the following: in the above technical solution, the bottom radial dimension of the mold body of the rear shell forming mold is smaller than its top radial dimension, thereby forming the undercut structure; its top is used to form the closed end of the rear shell, and its bottom is used to form the open end of the rear shell. This specific and measurable mold construction, where the bottom radial dimension is smaller than the top radial dimension, provides a solid structural foundation for the demolding method, ensuring that the rear shell with the undercut can be demolded smoothly, efficiently, and without damage.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] 1. By precisely setting the parting surface at the boundary of the product's shape (such as a recess or protrusion), the seam is integrated with the shape lines, successfully hiding it and completely solving the problem of exposed seams in traditional left-right split structures that affect the overall visual integrity.

[0011] 2. The mating surfaces of the front and rear shells at the parting surface are mold surfaces that match each other. This means that the shape and precision of the seam are directly guaranteed by the mold, thus achieving uniform and small gaps and precise alignment, fundamentally overcoming the defects of difficult size control and uneven seams caused by manual finishing.

[0012] 3. For the back shell with an inverted structure, an innovative combination of a vacuum forming process and a specific manual demolding method was used, successfully solving the demolding problem of male mold vacuum forming. This technological breakthrough makes it possible to adopt a more aesthetically pleasing and more ergonomically sound front and rear split design.

[0013] 4. A dedicated mold system (such as a female mold for the front shell and a male mold for the rear shell at a specific angle) is matched with the above-mentioned innovative process, ensuring that even complex undercut parts can achieve stable, efficient and high-quality mass production, improving the aesthetics while ensuring the structural strength and production consistency of the product. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of a shell with a left-right split structure in the existing technology.

[0016] Figure 1 The label in is: 1 / 1. Left shell; 2. / Right shell;

[0017] Figure 2 This is a schematic diagram of the front and rear split shell of this utility model;

[0018] Figure 3 This is a schematic diagram of the female mold in the vacuum forming mold of this utility model;

[0019] Figure 4 This is a schematic diagram of the undercut structure of the male mold and the demolding direction in the vacuum forming mold of this utility model.

[0020] Figure 2-4 The numbers in the mold are: 1. Front shell; 2. Rear shell; 3. Female mold; 4. Male mold. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation 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.

[0023] See Figure 2This invention relates to a front-and-rear split shell for a moxibustion robot, comprising a front shell 1 and a rear shell 2. The parting surface between the front shell 1 and the rear shell 2 is located at the boundary of the shell's overall shape. The mating surfaces of the front shell 1 and the rear shell 2 at the parting surface are mutually fitting mold surfaces. The front shell 1 is a component formed by vacuum forming using a female mold 3. The rear shell 2 is a component formed by vacuum forming using a male mold 4 with an undercut structure, and the rear shell 2 has a shape corresponding to the undercut structure of the male mold 4. The parting surface is located on a recessed portion or a protruding portion of the shell's overall shape.

[0024] See Figure 3 and Figure 4 This invention discloses a vacuum forming mold for manufacturing a split-type outer shell, comprising a front shell forming mold and a rear shell forming mold. The front shell forming mold is a female mold 3, used to form the front shell 1. The rear shell forming mold is a male mold 4, the mold body of which is provided with an inverted structure for forming the rear shell 2. The shape of the inverted structure is suitable for demolding by stretching the product outward from both sides of the open end of the rear shell 2 and removing the rear shell 2 from the male mold 4 from bottom to top. The rear shell forming mold body has a bottom radial dimension smaller than its top radial dimension, thus forming the inverted structure; its top is used to form the closed end of the rear shell 2, and its bottom is used to form the open end of the rear shell 2.

[0025] Example 1:

[0026] Taking the manufacturing of the outer shell of a moxibustion robot as an example, based on the industrial design of the robot's shell, a ring-shaped recess at its waistline is determined as the parting surface. This parting surface is the dividing point of the product's overall shape. Based on this parting surface, the entire shell is divided into two parts: the front shell 1 and the rear shell 2. This design ensures that the final seam is integrated with the product's shape, making it aesthetically pleasing and concealed.

[0027] Based on the above disassembly scheme, a dedicated vacuum forming mold system is manufactured. This system includes a female mold 3 and a male mold 4. The cavity surface of the female mold 3 is consistent with the outer surface shape of the front shell 1. The surface of the male mold 4 is consistent with the inner surface shape of the rear shell 2. The core of the male mold 4 is that its mold body is designed with an undercut structure. Specifically, the radial dimension of the bottom of the mold body used to form the open end of the rear shell is smaller than the radial dimension of its top used to form the closed end of the rear shell.

[0028] After the plastic sheet is heated and softened, it is vacuum-formed on the female mold 3 using a conventional female mold vacuum forming process. By drawing a vacuum, the sheet is made to fit tightly into the cavity of the female mold 3. After cooling and solidification, it can be directly demolded upwards to obtain the front shell 1 component.

[0029] The softened plastic sheet is vacuum-formed onto the male mold 4 using a vacuum forming process. This process ensures that the sheet fully wraps around and tightly conforms to the complex shape of the male mold 4 under negative pressure, completely replicating all details, including the undercut, to form the back shell 2 component. Due to the presence of the undercut structure, the back shell 2 cannot be demolded conventionally. The operator must demold according to a specified manual sequence, including lateral stretching: placing both hands on either side of the open end of the formed back shell 2, along the attached... Figure 4 As indicated by the middle arrow, slowly and evenly stretch the product outwards. This action utilizes the elastic deformation of the plastic to deform a local area at the opening of the rear shell 2, thereby disengaging it from the mold's undercut structure. Remove upwards: While maintaining the lateral stretch, remove the rear shell 2 entirely from the male mold 4 from bottom to top, completing the demolding process.

[0030] Excess flash is cut off, and the front shell 1 and the rear shell 2 are precisely aligned using special tooling. Since the mating surfaces of the two are molded on the mold to match each other, a precise and uniform joint can be achieved. Adhesive is applied to the mating surfaces for fixation, and after curing, a complete and beautiful moxibustion robot shell is obtained.

[0031] Example 2:

[0032] Taking the manufacturing of an air purifier casing as an example, for the cylindrical shape of the air purifier, a ring-shaped decorative protrusion in the middle of the casing is selected as the parting surface. This protrusion is the dividing point of the product's shape, separating the casing into an upper cover and a lower cylinder. The upper cover is manufactured using a female mold. The lower cylinder is manufactured using a male mold. This male mold is cylindrical, with its bottom radial dimension significantly smaller than its top radial dimension, forming a deep inverted structure. The upper cover is formed using conventional female mold vacuum forming, allowing for direct demolding. The lower cylinder is formed using a vacuum forming process. During demolding, the operator must hold the opening end of the cylinder with both hands, first expanding it evenly outwards in all directions, and then removing the product from the mold from bottom to top. Finally, the components are bonded at the mold surface of the ring-shaped joint, forming a complete cylindrical casing. This structure has concealed seams, a smooth appearance, and successfully solves the industry problem of vacuum forming and demolding deep cylindrical products.

[0033] Example 3

[0034] Taking the manufacturing of a smart speaker shell as an example, based on the speaker's streamlined design, the parting line is used at its maximum horizontal circumference, a subtle curved transition. The shell is then divided into an upper shell and a lower shell. The upper shell is manufactured using a female mold, while the lower shell is manufactured using a male mold. The curved shape of the male mold results in a smaller bottom projection area than the top, creating a complex curved inverted surface. The upper shell is manufactured using conventional female mold vacuum forming. The lower shell uses a vacuum forming process to ensure the material evenly covers the complex curved surface. During demolding, a specific sequence must be followed: first, stretch designated points on both sides of the product, then stretch the other two sides, and finally remove it from bottom to top. This specific demolding sequence is crucial to ensuring that the complex curved surface product does not deform or get damaged. Finally, using tooling for positioning, the joints are bonded on the continuous curved surfaces. The final product has smooth seams, perfectly replicating the original design, and has a robust structure.

[0035] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A front-rear split shell, comprising a front shell (1) and a rear shell (2), characterized in that: The parting surface of the front shell (1) and the rear shell (2) is located at the boundary of the outer shape of the shell; the mating surfaces of the front shell (1) and the rear shell (2) at the parting surface are mold surfaces that match each other; the front shell (1) is a component made by vacuum forming with a female mold (3); the rear shell (2) is a component made by vacuum forming with a male mold (4) with an undercut structure, and the rear shell (2) has a shape corresponding to the undercut structure of the male mold (4).

2. The front and rear split shell according to claim 1, characterized in that: The parting surface is located on a recess or a protrusion of the outer shell shape.

3. A vacuum forming mold for manufacturing a front and rear split shell as described in any one of claims 1-2, characterized in that: It includes a front shell forming mold and a rear shell forming mold; the front shell forming mold is a female mold (3) used to form the front shell (1); the rear shell forming mold is a male mold (4), and its mold body is provided with an undercut structure for forming the rear shell (2); the shape of the undercut structure is suitable for demolding by stretching the product outward from both sides of the opening end of the rear shell (2) and removing the rear shell (2) from the male mold (4) from bottom to top.

4. The vacuum forming mold according to claim 3, characterized in that: The mold body of the rear shell forming mold has a bottom radial dimension smaller than its top radial dimension, thereby forming the inverted structure; its top is used to form the closed end of the rear shell (2), and its bottom is used to form the open end of the rear shell (2).

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