Double-color injection mold for forming product with wheat ear grain texture
By designing a two-color injection mold, combined with a wheat ear texture molding layer and a pressing mechanism, the problem of unclear wheat ear texture in traditional molding is solved, achieving clear presentation and high-quality molding of the wheat ear texture, and meeting users' needs for diverse visual effects in automotive interiors.
Patent Information
- Application Number
- CN202520012080.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-01-03
AI Technical Summary
Traditional automotive interior trim patterns often struggle to maintain a consistent appearance, especially under different ambient lighting conditions where white streaks can appear, affecting both aesthetics and visual appeal.
A two-color injection mold is used. The fixed mold is equipped with a wheat ear texture molding layer and a clamping mechanism, while the moving mold is equipped with a clamping block. Through the cooperation of the drive unit during the mold closing and opening process, the wheat ear texture is ensured to be well presented on the product, and the 'white streaks' phenomenon is avoided.
It achieves a clear presentation of the wheat ear pattern on the product, improves molding quality and visual effect, solves the 'white stripe' problem, and meets users' needs for diverse visual effects.
Smart Images
Figure CN223934019U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of two-color injection molding technology, specifically relating to a two-color injection mold for molding products with wheat ear texture. Background Technology
[0002] As competition intensifies in the automotive market, consumers are demanding higher quality from car interiors. The quality of a car's interior reflects its perceived class and significantly impacts sales. Traditional car interiors typically employ a wrapping process, resulting in a relatively simple appearance that fails to meet diverse user expectations for visual appeal. Therefore, interior trim pieces with various textures are widely used, such as those featuring a wheat-ear pattern. However, the structural characteristics of the wheat-ear pattern present challenges in its manufacturing process, making it difficult to guarantee the desired texture's appearance. Utility Model Content
[0003] The purpose of this invention is to provide a two-color injection mold for molding products with wheat ear texture, so as to solve the problems existing in the processing and molding, and to ensure the good presentation effect of the wheat ear texture.
[0004] This utility model is achieved through the following technical solution:
[0005] Two-color injection molds for molding products with a wheat ear texture include:
[0006] The fixed mold is provided with a first fixed mold core and a second fixed mold core. The bottom surface of the mold cavity of the first fixed mold core is provided with a wheat ear texture forming layer for forming a wheat ear texture surface on a shot product. The second fixed mold is provided with a fixed mold cavity for forming a shot product.
[0007] The moving mold has two identical moving mold cores, and the moving mold cores have moving mold cavities for molding a shot product.
[0008] In some embodiments, the wheat ear texture molding layer is formed by a plurality of irregular strip grooves processed on the bottom surface of the mold cavity of the first fixed mold core. The irregular strip grooves are arranged along the length direction of the first fixed mold core and cover the entire bottom surface of the mold cavity. The cross section along the transverse direction of the wheat ear texture molding layer is serrated, and the chamfer diameter of the sharp corner at the bottom of the serration is not greater than 0.1mm.
[0009] In some embodiments, the moving mold core is provided with a plurality of clamping mechanisms located outside the moving mold cavity, the clamping mechanisms being able to fix a shot product inside the moving mold cavity when the fixed mold and the moving mold open.
[0010] In some embodiments, the clamping mechanism includes a clamping block that slides with the moving mold core;
[0011] When the fixed mold and the moving mold are closed, the clamping block on the moving mold core that is closed with the first fixed mold core can be pushed to move closer to the moving mold cavity, and the clamping block on the moving mold core that is closed with the second fixed mold core can be pushed to move away from the moving mold cavity.
[0012] In some embodiments, the clamping block is provided with a first driving part and a second driving part;
[0013] The fixed mold is provided with a third driving part that cooperates with the first driving part at a position corresponding to the first fixed mold core. When the fixed mold and the moving mold are closed, the clamping block on the corresponding moving mold core is driven to move towards the moving mold cavity through the cooperation between the third driving part and the first driving part.
[0014] The second fixed mold core is provided with a fourth driving part that cooperates with the second driving part. When the fixed mold and the moving mold are closed, the fourth driving part cooperates with the second driving part to drive the clamping block on the corresponding moving mold core to move away from the moving mold cavity.
[0015] In some embodiments, the clamping block includes a sliding part for slidingly engaging with the moving mold core, a cantilevered portion extending toward the moving mold cavity and disposed on the clamping part, and a driving part protruding onto the sliding part toward the fixed mold.
[0016] The first driving part and the second driving part are a first driving surface and a second driving surface disposed opposite to each other on the driving part, and the first driving surface and the second driving surface are inclined surfaces oriented in opposite directions;
[0017] The fixed mold is provided with a first recess for the drive part to extend into, and the third drive part is a third drive surface located on the first recess, and the third drive surface and the first drive surface are in contact.
[0018] The second fixed mold core is provided with a second recess for the drive part to extend into, and the fourth drive part is a fourth drive surface located on the second recess, and the fourth drive surface and the second drive surface are engaged.
[0019] The fixed mold has a third recess at the location of the second fixed mold core, into which the driving part extends. The third recess provides space for the driving part to move in a direction away from the moving mold cavity.
[0020] In some embodiments, the moving mold core is provided with clamping mechanisms at both ends of the moving mold cavity for fixing the two ends of a shot product.
[0021] In some embodiments, a clamping mechanism is provided on the side of the moving mold cavity near the gating system on the moving mold core, and no clamping mechanism is provided on the other side of the moving mold cavity.
[0022] Compared with the prior art, this utility model has the following advantages and beneficial effects:
[0023] This invention features a wheat ear texture molding layer at the bottom of the mold cavity of the fixed mold core for molding a first-shot product. During the first-shot molding process, a wheat ear texture is formed on the first-shot product. Then, a second-shot product is formed on one side of the wheat ear texture of the first-shot product, and a wheat ear texture is formed between the first-shot product and the second-shot product. This allows the wheat ear texture to be well presented on the product. The two-color injection mold is convenient for processing and can effectively guarantee the molding quality and presentation effect of the wheat ear texture.
[0024] By designing the mold core structure and setting and arranging clamping blocks in the moving mold core, the problem of "white streaks" in the wheat ear pattern obtained from the molding of two-color products is effectively solved, thus improving the presentation effect of the wheat ear pattern in two-color products. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the closed state structure of a two-color injection mold according to an embodiment of this utility model.
[0027] Figure 2 This is a schematic diagram of the fixed mold structure in an embodiment of this utility model.
[0028] Figure 3 This is a schematic diagram of the first mold core structure in an embodiment of this utility model.
[0029] Figure 4 This is a schematic diagram of the sharp corner structure of the wheat ear texture molding layer in an embodiment of this utility model.
[0030] Figure 5 This is a schematic diagram of the moving mold structure in an embodiment of this utility model.
[0031] Figure 6 This is a schematic diagram of the moving mold core structure in an embodiment of this utility model.
[0032] Figure 7 for Figure 6 A partial schematic diagram of point B in the middle.
[0033] Figure 8 This is a schematic diagram of the structure of a shot product obtained by molding on the moving mold core in an embodiment of this utility model.
[0034] Figure 9 for Figure 8 A partial schematic diagram at point C.
[0035] Figure 10 This is a cross-sectional schematic diagram of the clamping block clamping a product in an embodiment of the present invention.
[0036] Figure 11 This is a cross-sectional schematic diagram showing the release of the clamping block from the clamping action on the first shot product during the mold closing of the second shot in an embodiment of this utility model.
[0037] Figure 12 This is a schematic diagram of the structure of a product in an embodiment of this utility model.
[0038] Figure 13 This is a schematic diagram of the structure of the two-shot product in an embodiment of this utility model.
[0039] in:
[0040] 10. Fixed mold; 101. First recessed part; 102. Third driving surface; 103. Third recessed part; 11. First fixed mold core; 111. Wheat ear texture molding layer; 112. Strip groove; 113. Sharp corner; 12. Second fixed mold core; 121. Second recessed part; 122. Fourth driving surface.
[0041] 20. Moving mold; 21. Moving mold core; 211. Moving mold cavity;
[0042] 30. Clamping mechanism; 31. Clamping block; 311. Driving part; 3111. First driving surface; 3112. Second driving surface; 312. Sliding part; 313. Clamping part.
[0043] 41. One-shot product; 42. Two-shot product. Detailed Implementation
[0044] 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 some embodiments of this utility model, but not all embodiments.
[0045] Reference Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 In some embodiments of this utility model, a two-color injection mold for molding products with a wheat ear texture includes:
[0046] The fixed mold 10 is provided with a first fixed mold core 11 and a second fixed mold core 12. The bottom surface of the mold cavity of the first fixed mold core 11 is provided with a wheat ear texture forming layer 111 for forming a wheat ear texture surface on the first shot product. The second fixed mold 12 is provided with a fixed mold cavity for forming a second shot product.
[0047] The moving mold 20 has two identical moving mold cores 21, and the moving mold cores 21 have moving mold cavities for molding a shot product.
[0048] During molding, a product 41 is formed through the cavity of the first fixed mold core and one of the moving mold cores, such as... Figure 8 and Figure 12 As shown, after rotating the moving mold 180°, it mates with the first injection product remaining in the cavity of the moving mold core through the cavity of the first fixed mold core, forming the second injection product 42 on the first injection product, as shown. Figure 13 As shown, a wheat ear texture molding layer is set at the bottom of the mold cavity of the mold core of the first shot product. During the first shot molding, the wheat ear texture is formed on the first shot product. Then, the second shot product is formed on one side of the wheat ear texture of the first shot product. The wheat ear texture is formed between the first shot product and the second shot product. The first shot product is made of transparent PC plastic. Under different colored ambient lights, the wheat ear textures of different depths are distinct and crystal clear, so that the wheat ear texture can be well presented on the product.
[0049] In some embodiments, refer to Figure 3 , Figure 4 The wheat ear texture molding layer 111 is formed by several irregular strip grooves 112 processed on the bottom surface of the mold cavity of the first fixed mold core. The irregular strip grooves 112 are arranged along the length direction of the first fixed mold core and cover the entire bottom surface of the mold cavity. The cross section along the transverse direction of the wheat ear texture molding layer is serrated, and the chamfer diameter of the sharp corner 113 at the bottom of the serrated shape is not greater than 0.1mm.
[0050] The molding quality of the wheat ear pattern at the bottom sharp corner directly affects the molding quality of the pattern on the final product. Poor molding quality will result in "white streaks" and indistinct edges. The "white streaks" are particularly noticeable under different colored ambient lighting, severely impacting the product's appearance and visual appeal.
[0051] When processing the wheat ear pattern on the first mold core, a special hard tool is used. The tool is a ball-end cutter with a cutting head diameter of no more than 0.1mm. This gives the sharp corners at the bottom of the serrated wheat ear pattern a certain chamfer, and the diameter of the chamfer is no more than 0.1mm. This effectively ensures the processing quality of the wheat ear pattern forming layer, thereby ensuring the forming quality of the first shot product at the sharp corner position and solving the problem of "white streaks" in the wheat ear pattern.
[0052] When machining the bottom sharp corner of the wheat ear texture layer, controlling the rotation speed of the ball end mill to be no less than 25,000 rpm can effectively ensure the machining quality of the bottom sharp corner of the wheat ear texture layer.
[0053] During injection molding, after the first injection is completed, the first injection needs to remain in the cavity of the moving mold core. In order to prevent the first injection from being carried out or its position from shifting when the mold is opened, it is necessary to be able to fix the first injection in the cavity of the moving mold core.
[0054] In some embodiments, refer to Figure 5 and Figure 6 Multiple clamping mechanisms 30 are provided on the moving mold core 21 outside the moving mold cavity 211. The clamping mechanisms 30 can fix a shot product in the moving mold cavity 211 when the fixed mold and the moving mold are opened.
[0055] In some embodiments, the clamping mechanism 30 includes a clamping block 31 that slides with the moving mold core, and the clamping block 31 is capable of horizontal movement in a direction away from or towards the moving mold cavity;
[0056] When the fixed mold and the moving mold are closed, the clamping block on the moving mold core that is closed with the first fixed mold core can be pushed to move closer to the moving mold cavity, and the clamping block on the moving mold core that is closed with the second fixed mold core can be pushed to move away from the moving mold cavity.
[0057] By coordinating the clamping mechanism with other parts of the mold, when the mold is closed, the clamping block on the moving mold core that cooperates with the first fixed mold core can be pushed to the position to fix the first shot product, thereby clamping and fixing the first shot product; at the same time, the clamping block on the moving mold core that cooperates with the second fixed mold core can be pushed to the position to release the clamping and fixing of the first shot product, so as to avoid the impact of the clamping block on the molding of the second shot product and to allow the two-color product after the second shot molding to be ejected when the mold is opened.
[0058] In terms of the structural design of the clamping mechanism, since the clamping block needs to be located in different positions during the first and second injection molding processes, and the clamping block is located between the moving mold and the fixed mold, there are great difficulties in designing the motion control mechanism of the clamping block.
[0059] In some embodiments, refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 and Figure 11 The clamping block 31 is provided with a first driving part and a second driving part;
[0060] A third driving part is provided on the fixed mold 10 at a position corresponding to the first fixed mold core, which cooperates with the first driving part. When the fixed mold and the moving mold are closed, the clamping block on the corresponding moving mold core is driven to move towards the moving mold cavity through the cooperation between the third driving part and the first driving part.
[0061] The second fixed mold core 12 is provided with a fourth driving part that cooperates with the second driving part. When the fixed mold and the moving mold are closed, the fourth driving part cooperates with the second driving part to drive the clamping block on the corresponding moving mold core to move away from the moving mold cavity.
[0062] During mold closing, the clamping block is driven to move towards the moving mold cavity through the cooperation between the fixed mold and the clamping block, allowing the clamping block to move to a position that can fix the shot product. Through the cooperation between the second fixed mold core and the clamping block, the clamping block is driven to move away from the moving mold cavity, allowing the clamping block to move to a position that releases the fixation of the shot product.
[0063] In some embodiments, refer to Figure 7 and Figure 8 The clamping block 31 includes a sliding part 312 for slidingly engaging with the moving mold core, a cantilever structure extending out toward the moving mold cavity and a driving part 311 protruding on the sliding part toward the fixed mold.
[0064] The first driving unit and the second driving unit are a first driving surface 3111 and a second driving surface 3112 disposed opposite to each other on the driving unit. The first driving surface 3111 and the second driving surface 3112 are inclined surfaces that are inclined in opposite directions. The inclination angle of the first driving surface and the second driving surface is set to 17°.
[0065] Reference Figure 10 and Figure 11 The fixed mold 10 is provided with a first recess 101 into which the driving part extends. The third driving part is a third driving surface 102 located on the first recess. The third driving surface 102 and the first driving surface 3111 cooperate with each other.
[0066] The second fixed mold core 12 is provided with a second recess 121 for the drive part to extend into, and the fourth drive part is a fourth drive surface 122 located on the second recess, and the fourth drive surface 122 cooperates with the second drive surface 3112.
[0067] A third recess 103 is provided on the fixed mold 10 at the location of the second fixed mold core, into which the drive part extends. The third recess 103 provides space for the drive part to move in a direction away from the moving mold cavity.
[0068] The clamping part 313 adopts a cantilever structure, which clamps and fixes the edge of the shot product through its end. While clamping the shot product, it can reduce the volume of the clamping block and facilitate the setting of the clamping block on the moving mold core.
[0069] By utilizing the mold closing action, a force is generated between the fixed mold, the fixed mold core, and the clamping block, which simplifies the mold structure and makes the operation more stable and reliable. Simultaneously, by differentiating the structures of the fixed mold, the first fixed mold core, and the second fixed mold core, the clamping blocks on the two moving mold cores can be driven to move to different positions during mold closing.
[0070] In some embodiments, the moving mold core 21 is provided with clamping mechanisms 30 at both ends of the moving mold cavity for fixing the two ends of a shot product.
[0071] In some embodiments, a clamping mechanism 30 is provided on the side of the moving mold core 21 near the gating, and no clamping mechanism is provided on the other side of the moving mold cavity.
[0072] Since the product shrinks after molding, the product will generate mutual tension with the clamping block during shrinkage, which will cause stress cracks in the product. In this embodiment, the clamping mechanism is only set on the sprue and the upper and lower sides of the product to fix the product and avoid affecting the molding of the product on the non-sprue side.
[0073] The process of product molding using the two-color injection mold in the above embodiments is as follows:
[0074] The mold is closed, and a product is formed in the mold cavity of the first fixed mold core;
[0075] Open the mold, and rotate the moving mold 180°.
[0076] The mold is closed, and a second product is formed on the first product through the mold cavity of the second fixed mold core, while a second product is formed again in the mold cavity of the first fixed mold core.
[0077] Open the mold and eject the molded two-color product;
[0078] Repeat this process.
[0079] The first-shot product uses transparent PC material, while the second-shot product uses ABS+PC material. The fixed mold is mounted on the fixed platen of the injection molding machine and typically remains stationary during the injection process. The part where the injection nozzle engages with the mold is generally stationary; the mold that the injection nozzle contacts is the fixed mold. The moving mold is mounted on the moving platen of the injection molding machine and can rotate during mold opening.
[0080] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to 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.
[0081] Furthermore, the use of terms such as "horizontal" or "vertical" in the description of this utility model does not imply that the component is required to be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0082] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 utility model according to the specific circumstances.
[0083] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A two-color injection mold for molding products with a wheat ear texture, characterized in that, include: The fixed mold is provided with a first fixed mold core and a second fixed mold core. The bottom surface of the mold cavity of the first fixed mold core is provided with a wheat ear texture forming layer for forming a wheat ear texture surface on a shot product. The second fixed mold is provided with a fixed mold cavity for forming a shot product. A moving mold, wherein two identical moving mold cores are provided on the moving mold cores, and the moving mold cores are provided with moving mold cavities for molding a shot product; The wheat ear texture molding layer is formed by several irregular strip grooves processed on the bottom surface of the mold cavity of the first fixed mold core. The irregular strip grooves are arranged along the length direction of the first fixed mold core and cover the entire bottom surface of the mold cavity. The cross section along the transverse direction of the wheat ear texture molding layer is serrated, and the chamfer diameter of the sharp corner at the bottom of the serrated shape is no greater than 0.1mm. The moving mold core is provided with multiple clamping mechanisms located outside the moving mold cavity. The clamping mechanisms can fix a shot product inside the moving mold cavity when the fixed mold and the moving mold open.
2. The two-color injection mold for molding products with a wheat ear texture as described in claim 1, characterized in that, The clamping mechanism includes a clamping block that slides with the moving mold core; When the fixed mold and the moving mold are closed, the clamping block on the moving mold core that is closed with the first fixed mold core can be pushed to move closer to the moving mold cavity, and the clamping block on the moving mold core that is closed with the second fixed mold core can be pushed to move away from the moving mold cavity.
3. The two-color injection mold for molding products with a wheat ear texture as described in claim 2, characterized in that, The clamping block is provided with a first driving part and a second driving part; The fixed mold is provided with a third driving part that cooperates with the first driving part at a position corresponding to the first fixed mold core. When the fixed mold and the moving mold are closed, the clamping block on the corresponding moving mold core is driven to move towards the moving mold cavity through the cooperation between the third driving part and the first driving part. The second fixed mold core is provided with a fourth driving part that cooperates with the second driving part. When the fixed mold and the moving mold are closed, the fourth driving part cooperates with the second driving part to drive the clamping block on the corresponding moving mold core to move away from the moving mold cavity.
4. The two-color injection mold for molding products with a wheat ear texture as described in claim 3, characterized in that, The clamping block includes a sliding part for slidingly engaging with the moving mold core, a cantilever structure extending out toward the moving mold cavity and disposed on the clamping part, and a driving part disposed on the sliding part and protruding toward the fixed mold. The first driving part and the second driving part are a first driving surface and a second driving surface disposed opposite to each other on the driving part, and the first driving surface and the second driving surface are inclined surfaces oriented in opposite directions; The fixed mold is provided with a first recess for the drive part to extend into, and the third drive part is a third drive surface located on the first recess, and the third drive surface and the first drive surface are in contact. The second fixed mold core is provided with a second recess for the drive part to extend into, and the fourth drive part is a fourth drive surface located on the second recess, and the fourth drive surface and the second drive surface are engaged. The fixed mold has a third recess at the location of the second fixed mold core, into which the driving part extends. The third recess provides space for the driving part to move in a direction away from the moving mold cavity.
5. The two-color injection mold for molding products with a wheat ear texture as described in claim 1, characterized in that, The moving mold core is provided with clamping mechanisms at both ends of the moving mold cavity for fixing the two ends of the injection product.
6. The two-color injection mold for molding products with a wheat ear texture according to claim 5, characterized in that, A clamping mechanism is provided on the side of the moving mold cavity near the gating system, while no clamping mechanism is provided on the other side of the moving mold cavity.