Casting mold for main shell of new energy charging gun

Abstract

The invention relates to the technical field of new energy charging gun production and manufacturing, in particular to a new energy charging gun main shell pouring mold which comprises a first mold body and a second mold body which can be buckled with each other, and a cavity used for pouring a new energy charging gun main shell is defined by the first mold body and the second mold body. The first mold body and the second mold body are also encircled to form a flat buffer glue inlet cavity, the buffer glue inlet cavity is connected with the mold cavity and the glue inlet pipeline along the longitudinal direction, and the connection position of the buffer glue inlet cavity and the mold cavity is located on one of the joint end surfaces, corresponding to the new energy charging gun main shell and other joint pieces of the new energy charging gun, of the mold cavity. The appearance quality of the new energy charging gun is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of new energy charging gun manufacturing technology, specifically a casting mold for the main shell of a new energy charging gun. Background Technology

[0002] In the manufacturing process of charging gun housings for new energy vehicles, a multi-component, separate casting and reassembly process is typically employed. This process first manufactures the housings of the charging guns using a casting molding process, such as... Figure 8 The main housing 1 of the new energy charging gun and its various connecting components are shown. These components are then assembled onto the connecting end faces (including the front connecting end face 5, the upper connecting end face 6, and the rear connecting end face 3) of the main housing 1 using snap-fit ​​and other connecting structures, ultimately forming a complete charging gun housing assembly. The production of the main housing 1 of the new energy charging gun employs a typical dual-mold casting system. This system consists of a first mold and a second mold that can interlock with each other. When the two molds are closed, they form a cavity that perfectly matches the shape of the main housing 1 of the new energy charging gun. In the mold design, at least one mold is equipped with a sprue and a sprue pipe connected to it. Molten casting material is injected through the sprue and transported into the cavity through the sprue pipe to complete the filling and curing process.

[0003] In traditional manufacturing processes, to ensure product appearance quality, the connection point between the glue inlet pipe and the mold cavity (i.e., Figure 8 The injection point 4) is located on the inner side of the grip portion 2 of the main housing 1 of the new energy charging gun. While this design can relatively conceal the sprue marks after casting through structural shielding, it is no longer sufficient to meet the quality demands of the high-end market as end-users increasingly demand higher product aesthetics. In particular, the sprue marks on the inner side may still be visible when the user holds the device, affecting the overall appearance of the product. To address this issue, the applicant's technicians attempted to optimize the injection point to the bottom area of ​​the rear joint end face 3. This location can be completely covered by the joint during subsequent assembly, theoretically achieving perfect concealment of the casting marks. However, actual production testing revealed that while this improvement solved the problem of exposed sprue marks, it also... Figure 8 The area A shown has developed a new appearance defect—a jet-like pattern resembling water ripples. This peculiar surface imperfection exhibits a radial texture, which not only affects the visual appeal but also creates a noticeable uneven texture, severely reducing the product's commercial value. Summary of the Invention

[0004] The present invention aims to provide a casting mold for the main shell of a new energy charging gun, which can significantly improve the appearance quality of the new energy charging gun.

[0005] To solve the above technical problems, the specific solution adopted by the present invention is as follows: a casting mold for the main shell of a new energy charging gun, including a first mold body and a second mold body that can be interlocked with each other. The first mold body and the second mold body together form a cavity for casting the main shell of the new energy charging gun. The first mold body and the second mold body also together form a flat buffer injection cavity. The buffer injection cavity connects the cavity and the injection pipe along the longitudinal direction, and the connection position of the buffer injection cavity and the cavity is located on one of the joint end faces of the cavity corresponding to the main shell of the new energy charging gun and other joint parts of the new energy charging gun.

[0006] Preferably, the transverse cross-sectional shape of the buffer inlet cavity is an isosceles trapezoid.

[0007] Preferably, the length ratio of the upper base to the lower base of the transverse cross section of the buffer inlet cavity is 1:1.

[0008] Preferably, the buffer inlet cavity is distributed in an arc shape along the corresponding joint end face and is concentric with the corresponding joint end face.

[0009] Preferably, both the first and second molds are provided with insert assemblies at the joint end faces corresponding to the main housing of the new energy charging gun. The insert assembly includes a base block, a plurality of molded inserts fixed on the base block, and a push-pull element for driving the base block to move. The shape and structure of the molded inserts correspond to the shape and structure inside the main housing of the new energy charging gun, and the molded inserts can be inserted into the cavity from the joint end face or pulled out from the cavity as the base block moves.

[0010] Preferably, the first mold body is provided with a plurality of positioning grooves spaced apart, and the second mold body is provided with positioning blocks that are matched with the positioning grooves.

[0011] Beneficial effects

[0012] First, the connection point between the buffer injection cavity and the mold cavity in this invention is located on the joint end face of the main housing of the charging gun, on the front joint end face 5, the upper joint end face 6, or the rear joint end face 3, so that the sprue position after molding can be completely covered by the subsequent assembled joint parts, avoiding exposure and affecting the aesthetics.

[0013] Secondly, after in-depth analysis by the applicant's technical personnel, the jetting marks mentioned in the background technology are mainly related to the fluid dynamics characteristics during the casting process. When the injection point is located at the bottom of the post-joint end face, the flow path of the melt in the cavity changes significantly, especially when flowing through... Figure 8Turbulence is easily formed in region A of the mold cavity. Simultaneously, variations in wall thickness in this area lead to uneven cooling rates, further exacerbating the formation of abnormal surface textures. This invention addresses this by incorporating a flat, buffered inlet cavity between the mold cavity and the injection line. This buffers and stabilizes the flow of molten material before it enters the mold cavity, preventing jet marks caused by high-speed flow or turbulence. The flat design of the buffered inlet cavity uniformly reduces the melt velocity, ensuring even and stable filling of the mold cavity, thereby improving the surface texture. Figure 8 The A area shown is designed to avoid wavy surface defects and meet high-standard appearance requirements.

[0014] In particular, the transverse cross-section of the buffer injection cavity adopts an isosceles trapezoidal structure, and the length ratio of the upper base to the lower base is controlled at 1:(1.05-1.15), which can further optimize the melt flow path, reduce flow resistance, and ensure that the material fills the cavity uniformly. In addition, the design of the buffer injection cavity being distributed in an arc shape along the joint end face makes the transition between it and the cavity smoother, avoiding material accumulation or short shot problems caused by abrupt changes in cross-section, thereby improving casting stability and product consistency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the first mold body of the casting mold for the main shell of a new energy charging gun according to the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the second mold body of the casting mold for the main shell of a new energy charging gun according to the present invention;

[0017] Figure 3 This is a schematic diagram showing the cooperation relationship between the buffer injection cavity and the injection pipeline in the casting mold of the main shell of a new energy charging gun according to the present invention.

[0018] Figure 4 This is a schematic diagram showing the fit between the main housing of the new energy charging gun produced by this invention and the rear joint end face.

[0019] Figure 5 for Figure 4 Front view structural diagram;

[0020] Figure 6 for Figure 5 Schematic diagram of the AA-direction cross-section structure;

[0021] Figure 7 This is a schematic diagram of the casting mold structure for the main housing of a new energy charging gun according to the present invention;

[0022] Figure 8 A three-dimensional structural diagram of the main housing of a new energy charging gun;

[0023] Figure 9This is a schematic diagram of the main structure of the new energy charging gun housing produced by the present invention.

[0024] Figure 10 for Figure 9 A schematic diagram of the left-side view structure;

[0025] Figure 11 for Figure 10 Schematic diagram of the AA-direction cross-section structure;

[0026] Figure 12 This is a structural schematic diagram of the rear joint end face of the main housing of the new energy charging gun produced by the present invention.

[0027] Figure 13 for Figure 9 A schematic diagram of the structure viewed from below;

[0028] The markings in the diagram are: 1. Main housing of the new energy charging gun; 2. Grip part; 3. Rear joint end face; 4. Inlet; 5. Front joint end face; 6. Upper joint end face; 7. Buffer plate; 8. Cavity; 9. First mold body; 10. Positioning groove; 11. Buffer inlet cavity; 12. Second mold body; 13. Insert assembly; 14. Base block; 15. Molded insert; 16. Inlet pipe; 17. Positioning insert; 18. Push-pull element; 19. Inlet. Detailed Implementation

[0029] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In this embodiment, the structure of the casting mold for the main housing of the new energy charging gun is as follows: Figure 1 , Figure 2 and Figure 7 As shown, the system includes a first mold body 9 and a second mold body 12 that can be interlocked. When the two mold bodies are closed, they form a cavity 8 that matches the shape of the main housing 1 of the new energy charging gun. Simultaneously, a flat buffer injection cavity 11 is formed at the mold-closing surface. This buffer injection cavity 11 connects the injection pipe 16 and the cavity 8 longitudinally, and its connection point with the cavity 8 is located on the cavity 8 corresponding to the rear joint end face 3 of the main housing 1 of the charging gun. This design ensures that the sprue after casting is located on the joint end face and can be completely covered by the subsequently assembled parts. This solves the problem of exposed sprue on the inner side of the traditional grip and avoids the jetting marks caused by injection at the rear joint end face in the prior art.

[0030] Specifically, such as Figure 3 The buffer inlet cavity 11 shown has an isosceles trapezoidal cross-section, with the preferred length ratio of the upper base to the lower base being 1:1.1. This gradually changing cross-section design allows the molten material to gradually decrease in velocity as it flows through the buffer inlet cavity 11, effectively guiding the flow direction. Figure 3As shown, when the material enters the buffer inlet cavity 11 from the inlet pipe 16, the inclined side of the trapezoidal cross-section can guide the fluid, allowing it to smoothly transition into the cavity 8, thereby eliminating... Figure 8 The jetting marks phenomenon in region A caused by turbulence. Experiments show that this ratio range can ensure smooth material flow while avoiding pressure loss caused by abrupt changes in cross-section.

[0031] Further optimized, the buffer inlet cavity 11 is distributed in an arc shape along the rear joint end face 3 (e.g. Figure 12 As shown), its radius of curvature is concentric with the three surfaces of the rear joint end. This arc-shaped flow channel design allows the material to be uniformly injected into the cavity 8 along the tangential direction of the joint end face, which significantly reduces the shear stress at the flow front compared to a straight injection method. Figure 11 As shown in the cross-sectional view, the material is filled in cavity 8 in a radial diffusion pattern, which avoids uneven cooling caused by local accumulation, thus ensuring that there are no defects such as flow marks or shrinkage marks on the product surface.

[0032] To achieve the molding of the complex internal structure of the charging gun's main housing 1, insert components 13 (such as...) are provided at the joint end faces of the first mold body 9 and the second mold body 12. Figure 7 (As shown). The component includes a base block 14, a plurality of molded inserts 15 arrayed and fixed on the base block 14, and a push-pull element 18 (in this embodiment, a hydraulic cylinder) for driving the linear movement of the base block 14. Figure 5 As shown, when the mold is closed, the push-pull element 18 pushes the base block 14, causing the molding insert 15 to be inserted into the cavity 8 from the joint end face, forming the inner cavity structure of the main shell 1; when the mold is opened, the reverse movement realizes the removal of the insert. This modular design not only solves the problem of difficult demolding of deep cavity structures, but its split insert layout also improves the heat dissipation performance of the mold, making the product cool more evenly.

[0033] To ensure mold closing accuracy, multiple positioning slots 10 are spaced apart on the first mold body 9 (e.g., Figure 1 As shown), the second module 12 is provided with a positioning block 17 that is interference-fitted with it at the corresponding position (as shown). Figure 2 As shown). Figure 7 As shown in the assembly diagram, during mold closing, the positioning insert 17 is embedded into the positioning groove 10 with an interference fit of 0.02-0.05mm, so that the misalignment of the two mold bodies in the XYZ directions is controlled within ±0.01mm. This structure effectively avoids the cumulative error of gaps present in traditional guide pillars, ensures the uniformity of wall thickness in all parts of the cavity 8, and eliminates the flash problem caused by mold closing deviation from the root.

[0034] In actual production, molten material is injected through the inlet 19 and enters the buffer inlet chamber 11 via the inlet pipe 16. For example... Figure 3As shown in the flow channel diagram, after the material undergoes flow rate adjustment and flow direction alignment within the buffer injection cavity 11, it is smoothly injected into the mold cavity 8 from the bottom of the rear joint end face 3. During the filling process, the material diffuses in a laminar flow state along the arc-shaped joint end face in all directions (e.g., Figure 11 As shown), it eventually fills the entire cavity. After demolding, the formed main shell 1 only has linear sprue marks at the bottom of the rear joint end face 3 (as shown). Figure 13 As shown), it can be completely covered by the joint after simple trimming, and the surfaces of the gripping part 2 and area A are smooth and without defects (as shown). Figure 9 , Figure 10 As shown in the figure, it fully meets the appearance requirements of high-end products.

[0035] During the casting process, the buffer injection cavity 11 forms an integrally molded buffer sheet 7 at the bottom of the rear joint end face 3 of the main housing 1 of the new energy charging gun. The buffer sheet 7 has a thickness of 0.8-1.2 mm, and its outline perfectly matches the shape of the buffer injection cavity 11, exhibiting an isosceles trapezoidal shape that is wider at the top and narrower at the bottom. This specially designed buffer sheet 7 has the following technical advantages:

[0036] First, such as Figure 9 and Figure 10 As shown in the front and left views, the buffer plate 7 is located at the bottom edge of the rear joint end face 3. The upper edge of its trapezoidal lower base smoothly transitions with the inner wall of the main shell 1, and the lower edge of the lower base forms a natural fracture line. After demolding, the buffer plate can be easily removed by bending and breaking it through this natural fracture line, and the resulting marks can be completely covered by the subsequent assembled joints. Compared with traditional dot-shaped sprue marks, this linear fracture method reduces the trimming process and avoids cracks caused by stress concentration.

[0037] Secondly, such as Figure 12 As shown in the rear view schematic diagram, the arc-shaped distribution of the buffer sheet 7 ensures that its radius of curvature matches that of the rear joint end face 3. This design allows the molten material to spread evenly along the tangential direction during filling, avoiding [further issues]. Figure 8 Turbulence is generated in region A shown. Experimental data shows that when the arc length of the buffer plate 7 is about 1 / 10 of the circumference of the joint end face, the temperature difference at the flow front of the material in the cavity 8 can be controlled within ±2℃, fundamentally eliminating jet mark defects.

[0038] In particular, Figure 11 As shown in the cross-sectional view, the trapezoidal cross-section design of the buffer plate 7 enables it to perform a gradual pressure reduction function. When the material enters the buffer inlet cavity 11, its velocity decreases significantly after passing through the buffer plate 7 area, greatly improving the efficiency of converting kinetic energy into pressure energy. This flow stabilization effect reduces the pressure fluctuation range of the material when entering the cavity 8, which helps to improve the uniformity of product density.

[0039] like Figure 13 As shown in the bottom view, the residual portion of the molded buffer sheet 7 exhibits a regular strip-like structure, which can be directly used as an assembly reference surface. Compared to the protruding structure left by traditional gates, this design improves the fit of the joints during assembly and effectively prevents abnormal noise problems caused by assembly gaps.

Claims

1. A casting mold for the main housing of a new energy charging gun, comprising a first mold body (9) and a second mold body (12) that can be interlocked, wherein the first mold body (9) and the second mold body (12) together form a cavity (8) for casting the main housing (1) of the new energy charging gun, characterized in that: The first mold (9) and the second mold (12) together form a flat buffer injection cavity (11). The buffer injection cavity (11) is longitudinally connected to the cavity (8) and the injection pipe (16). The connection position between the buffer injection cavity (11) and the cavity (8) is located on one of the joint end faces of the cavity (8) corresponding to the main housing (1) of the new energy charging gun and other joint parts of the new energy charging gun.

2. The casting mold for the main housing of a new energy charging gun as described in claim 1, characterized in that: The transverse cross-sectional shape of the buffer inlet cavity (11) is an isosceles trapezoid.

3. The casting mold for the main housing of a new energy charging gun as described in claim 2, characterized in that: The length ratio of the upper and lower bases of the transverse cross section of the buffer inlet cavity (11) is 1:(1.05-1.15).

4. The casting mold for the main housing of a new energy charging gun as described in claim 1, characterized in that: The buffer inlet cavity (11) is distributed in an arc shape along the corresponding joint end face and is concentric with the corresponding joint end face.

5. The casting mold for the main housing of a new energy charging gun as described in claim 1, characterized in that: On the first mold (9) and the second mold (12), there are insert assemblies (13) at the joint end face corresponding to the main housing (1) of the new energy charging gun. The insert assembly (13) includes a base block (14), a plurality of molded inserts (15) fixed on the base block (14), and a push-pull element (18) for driving the base block (14) to move. The shape and structure of the molded insert (15) correspond to the shape and structure inside the main housing (1) of the new energy charging gun. The molded insert (15) can be inserted into the cavity (8) from the joint end face or pulled out from the cavity (8) as the base block (14) moves.

6. The casting mold for the main housing of a new energy charging gun as described in claim 1, characterized in that: The first mold (9) is provided with a plurality of positioning grooves (10) spaced apart, and the second mold (12) is provided with positioning inserts (17) that are matched with the positioning grooves (10).

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