A two-wheeled vehicle fender processing die assembly

Abstract

The present application relates to a kind of two-wheeled vehicle fender processing die equipment, comprising: punch, female die and drive the die closing driving element of the punch each other close and each other far away;The punch and the female die are formed after abutting to form forming chamber;At least one of the punch or the female die includes template assembly and sliding insert;Slide groove is provided on the template assembly, and the sliding insert is slidably connected with the slide groove;Independent drive structure for driving the sliding insert to move in the slide groove is further provided on the template assembly.The beneficial effects of the present application are that the interference of pre-stored air in the cavity is excluded, the common problems of gas, flow marks and burning during the forming process of large thin-walled fender are completely solved, the filling pressure and the residual stress in the product are greatly reduced, and the shrinkage marks and the warping deformation defects on the surface of large-arc fender after forming are completely eliminated.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, specifically to a mold equipment for processing mudguards for two-wheeled vehicles. Background Technology

[0002] Mudguards for two-wheeled vehicles, such as bicycles, electric bikes, and motorcycles, are typically thin-walled, curved structures with a large radius of curvature, and require high standards for appearance quality and dimensional stability. Currently, the industry mainly uses traditional injection molding processes to manufacture mudguards.

[0003] However, the existing injection molding and demolding processes have the following insurmountable technical defects: First, it is prone to trapping air and causing blowholes. During the high-speed filling process of large curved thin-walled parts, if the air in the fixed cavity cannot be discharged in time, it can easily lead to problems such as trapped air, burning, or insufficient glue at the front end of the melt.

[0004] Secondly, the molding quality is difficult to control. Because the mudguard has a large arc shape and uneven wall thickness in some areas, the injection melt will experience uneven volume shrinkage during the filling and cooling stages in the fixed-volume molding chamber. This shrinkage not only easily produces shrinkage marks on the product surface, but also leads to huge residual stress inside the product, which in turn causes warping deformation after the mudguard is molded. Summary of the Invention

[0005] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0006] To address the technical problems mentioned in the background section, some embodiments of this application provide a two-wheeled vehicle mudguard processing mold equipment, including: a punch, a die, and a mold closing drive component that drives the punches to move closer and further apart; the punch and the die form a molding chamber after docking; at least one of the punch or the die includes a template assembly and a sliding insert; the template assembly is provided with a groove, and the sliding insert slides in cooperation with the groove; the template assembly is also provided with an independent drive structure for driving the sliding insert to move within the groove; the independent drive structure is configured to change the relative distance between the sliding insert and the opposing mold during injection molding, thereby dynamically adjusting the volume of the molding chamber.

[0007] Furthermore, the sliding insert is disposed on the punch side; the punch includes a first template as the template assembly and a protruding plate as the sliding insert; the die is provided with a groove; the independent driving structure directly or indirectly drives the protruding plate to move in the groove of the first template to change the gap size between the protruding plate and the groove.

[0008] Furthermore, the sliding insert is disposed on the die side; the die includes a second template as the template assembly and a push plate as the sliding insert; the punch has a protrusion; the independent drive structure drives the push plate to move in the groove of the second template to change the gap size between the push plate and the protrusion.

[0009] Furthermore, the first template is provided with an arc-shaped convex surface, which matches the outer edge of the mudguard; the convex plate, the groove and the arc-shaped convex surface together constitute the forming chamber.

[0010] Furthermore, when the punch and the die are demolded, after the first template and the punch plate move away from the die at the same time, the independent driving structure drives the punch plate to move into the groove of the first template.

[0011] Furthermore, the convex plate is provided with injection holes that are compatible with the screw extruder.

[0012] Furthermore, the mold equipment also includes a fixed frame and a guide rod. A connecting plate is provided on the convex plate, and the convex plate is fixed to the guide rod through the connecting plate. The concave mold and the first template are both slidably connected to the guide rod. The mold closing drive and the independent drive structure are both provided on the fixed frame. The output end of the mold closing drive is connected to the concave mold, and the output end of the independent drive structure is connected to the first template.

[0013] Furthermore, multiple convex plates and grooves are provided, and the multiple convex plates directly or indirectly cooperate with the screw extruder, and the number of grooves in the first template matches the number of convex plates.

[0014] Furthermore, the mold equipment also includes a fixed frame and a guide rod. A mating plate is provided on the push plate. The push plate is slidably connected to the guide rod through the connecting plate. The second template is slidably connected to the guide rod. The punch is fixed to the guide rod. The mold closing drive and the independent drive structure are both mounted on the fixed frame. The output end of the mold closing drive is connected to the push plate, and the output end of the independent drive structure is connected to the second template.

[0015] Furthermore, a connecting rod is provided on the second template, a push rod is provided on the connecting rod, and a through hole is provided on the punch. The push rod is slidably engaged with the through hole; the position of the through hole at least partially intersects with the forming chamber.

[0016] The beneficial effects of this invention are: The mold equipment described in this application can perform a vacuum injection molding process similar to "syringe suction". In the initial stage of injection molding, the die and sliding insert can fit completely together. As the extruder injects melt, the mold closing drive and independent drive structure gradually increase the distance between the die and the sliding insert, causing the cavity to gradually expand with the injection of melt until it forms a molding cavity identical in shape to the mudguard. This "zero-cavity start, follow-up expansion" working mode fundamentally eliminates the interference of pre-existing air in the cavity, completely solving the common problems of air entrapment, flow marks, and scorching during the molding of large thin-walled mudguards.

[0017] This application, by incorporating a sliding insert on the mold assembly and introducing an independent drive structure, enables dynamic adjustment of the relative distance between the sliding insert and the opposing mold during injection molding, thereby regulating the volume of the molding chamber. In practical applications, such as injection compression processes, secondary mechanical compression can be applied to the molten plastic by reducing the volume of the molding chamber at the end of injection molding or during the holding pressure stage. This design effectively compensates for volume shrinkage during plastic cooling, significantly reduces filling pressure and residual stress within the product, thus completely eliminating shrinkage marks on the surface of large-arc mudguards and warping defects after molding. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0019] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0020] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the die and the punch; Figure 3 yes Figure 2 A schematic diagram of the exploded structure; Figure 4 yes Figure 3 A schematic diagram of the exploded structure; Figure 5 This is an exploded structural diagram of the convex plate and the first template; Figure 6 yes Figure 1 A schematic diagram of the cross-sectional structure; Figure 7 yes Figure 6 A schematic diagram of a partial structure; Figure 8 yes Figure 7 An enlarged schematic diagram of part A in the middle; Figure 9 yes Figure 6 A schematic diagram of the cross-sectional structure; Figure 10 This is a structural diagram of the mudguard and some surrounding parts; Figure 11 This is a cross-sectional view of the second template and the push plate; Figure 12 yes Figure 11 Enlarged schematic diagram of part B.

[0021] The annotations in the attached figures are explained as follows: 1. Punch; 11. First template; 12. convex plate; 13. Slide groove; 14. Connecting plate; 15. Arc-shaped convex surface; 16. Injection hole; 17. Protrusion; 2. Cavity; 21. Groove; 22. Second template; 23. Push plate; 24. Butt plate; 3. Mold closing drive components; 4. Molding chamber; 5. Independent drive structure; 6. Fixing bracket; 61. Guide rod; 7. Mudguard; 71. Inner surface; 72. Outer surface; 73. Outer edge. Detailed Implementation

[0022] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0023] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0024] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0025] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0026] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Reference Figures 1-12 As shown, the present invention provides a two-wheeled vehicle mudguard processing mold equipment, including a punch 1, a die 2, and a mold closing drive 3. The mold closing drive 3 is used to drive the punch 1 and the die 2 to move closer together to achieve mold closing, and to drive them to move away from each other during the demolding stage to achieve mold opening. After the punch 1 and the die 2 are joined, they enclose a molding chamber 4 for injection molding the mudguard 7.

[0028] At least one of the punch 1 or die 2 includes a template assembly and a sliding insert. A groove 13 is provided on the template assembly, and the sliding insert slides into the groove 13. An independent drive structure 5 is also provided on the template assembly for driving the sliding insert to move within the groove 13. The independent drive structure 5 is configured to change the relative distance between the sliding insert and the opposing mold during injection molding, thereby dynamically adjusting the volume / local clearance size of the molding chamber 4.

[0029] Without changing the mold closing position or significantly altering the mold closing stroke, the cavity space corresponding to the 7-wall thickness of the mudguard can be adjusted online. For example, reducing the local clearance during the later stages of mold filling / holding pressure can increase local pressure and suppress shrinkage and warping; or appropriately increasing the local clearance during the initial stages of mold filling can improve flow and reduce the risk of shearing and weld lines. Alternatively, the relative distance between the sliding insert and the opposing mold can be zero initially, and then gradually increased during injection molding to avoid air leakage affecting product quality. Example

[0030] The mold equipment in this embodiment includes a punch 1, a die 2, a mold closing drive 3, and an independent drive structure 5.

[0031] The punch 1 and the die 2 move closer or further apart under the action of the mold closing drive 3. After the punch 1 and the die 2 are connected, they together form the molding chamber 4 for injection molding the mudguard 7 of a two-wheeled vehicle.

[0032] The core innovation of this embodiment lies in the fact that the structure of the punch 1 is designed to be movable and modular. Specifically, in this embodiment, the punch 1 includes a first template 11 as a template assembly and a punch 12 as a sliding insert.

[0033] The first template 11 is provided with a groove 13 for the sliding of the protruding plate 12. The main body of the protruding plate 12 matches the shape and size of the groove 13, so that the protruding plate 12 can slide smoothly within the groove 13. The first template 11 is also provided with an independent driving structure 5. The output end of the independent driving structure 5 is connected to the first template 11 and is used to drive the first template 11 to move relative to the protruding plate 12, thereby realizing the relative movement of the protruding plate 12 within the groove 13.

[0034] During injection molding, the independent drive structure 5 is precisely controlled to change the relative distance between the convex plate 12 and the opposing cavity mold 2, thereby dynamically adjusting the volume of the molding chamber 4. For example, at the end of the injection filling or holding pressure stage, the independent drive structure 5 can drive the first template 11, causing the convex plate 12 to move a small distance further towards the cavity mold 2, thus performing secondary compression on the molten plastic in the molding chamber 4. This effectively compensates for the volume loss caused by the cooling and shrinkage of the plastic, resulting in a mudguard 7 product with better surface quality, higher density, and more stable dimensions. Alternatively, before injection molding, the convex plate 12 and the groove 21 are attached, and then during the injection molding process, the distance between them gradually increases, achieving vacuum injection molding and avoiding the problem of poor product quality caused by incomplete air removal.

[0035] The mold equipment in this embodiment also includes a fixing frame 6 and multiple guide rods 61. The protruding plate 12 is fixedly connected to the guide rods 61 via a connecting plate 14, so the position of the protruding plate 12 is relatively fixed throughout the entire operation. The die 2 and the first template 11 are both slidably connected to the guide rods 61, and they are movable parts.

[0036] The mold closing drive component 3, such as a hydraulic cylinder or a servo motor, is mounted on the fixed frame 6. Its output end is connected to the die 2 and is used to drive the die 2 to move along the guide rod 61 to complete the opening and closing of the mold.

[0037] An independent drive structure 5, such as another set of hydraulic cylinders or servo motors, is also set on the fixed frame 6. Its output end is connected to the first template 11 and is used to drive the first template 11 to move independently along the guide rod 61.

[0038] The mold closing drive component 3 controls the opening and closing of the die 2 and the punch 12, while the independent drive structure 5 controls the relative position of the first template 11 and the punch 12. The two actions do not interfere with each other, realizing the dynamic and precise adjustment of the volume of the molding chamber 4.

[0039] To form the complete outline of the mudguard 7, the first template 11 is provided with an arc-shaped convex surface 15, the curvature and shape of which match the outer edge 73 of the mudguard 7 to be produced. The die 2 has a groove 21 that matches the outer surface 72 of the mudguard 7. The face of the protruding plate 12 facing the die 2 matches the inner surface 71 of the mudguard 7. Therefore, the final forming chamber 4 is formed by the forming surface of the protruding plate 12, the groove 21 of the die 2, and the arc-shaped convex surface 15 of the first template 11.

[0040] To facilitate material feeding, the injection hole 16 is preferably set on a relatively fixed protrusion 12, which can be directly and stably connected to the nozzle of an injection molding machine such as a screw extruder, thus ensuring the reliability of the injection molding process.

[0041] The workflow of this embodiment is as follows: Mold closing: The mold closing drive 3 drives the die 2 to move along the guide rod 61 toward the punch 1 until the mold opening of the die 2 fits against the arc-shaped convex surface 15 of the first template 11. At the same time, the independent drive structure 5 positions the first template 11 in the initial position, at which time a preset initial forming cavity 4 is formed between the punch 12 and the groove 21 of the die 2.

[0042] Injection Molding and Dynamic Volume Adjustment: The injection molding machine injects molten plastic into the molding chamber 4 through the injection hole 16. At the end of the injection filling or during the holding pressure stage, the control system issues a command, and the independent drive structure 5 drives the first template 11 to move slightly towards the die 2. Since the position of the protruding plate 12 is fixed, this is equivalent to the protruding plate 12 "extending" further from the groove 13 of the first template 11, thereby reducing the volume of the molding chamber 4 and compressing the plastic.

[0043] Pressure holding and cooling: The mold remains closed until the product cools and solidifies.

[0044] Mold opening and demolding: First, the mold closing drive 3 drives the die 2 away from the punch 1, completing the mold opening. At this time, because the inner surface 71 covers more tightly, the mudguard 7 will remain on the punch 12.

[0045] Next, the independent drive structure 5 drives the first template 11 to continue moving toward the cavity mold 2, that is, forward relative to the convex plate 12. During this process, the arc-shaped convex surface 15 on the first template 11 is equivalent to a demolding pusher 23, which will press against the outer edge 73 of the mudguard 7 product. It can also be understood that the convex plate 12 retracts into the groove 13 relative to the first template 11, thereby smoothly pushing the mudguard 7 product off the convex plate 12 and completing the demolding.

[0046] In another workflow, the above-mentioned injection molding and dynamic volume adjustment steps are replaced with vacuum injection molding. The vacuum injection molding method is that the independent drive structure 5 and the mold clamping drive 3 simultaneously drive the die 2 and the first template 11 toward the screw extruder until the groove 21 of the die 2 fits with the protrusion 12. Then the extruder starts to extrude the molten material outward. During the process of the extruder extrudes the molten material, the independent drive structure 5 and the mold clamping drive 3 simultaneously drive the groove 21 and the first template 11 away from the screw extruder. As a result, the originally fitted groove 21 and protrusion 12 will gradually separate and form the molding chamber 4.

[0047] In an optional embodiment, to improve production efficiency, multiple protrusions 12 and corresponding grooves 21 can be provided to achieve multi-cavity production in a single mold. In this case, the multiple protrusions 12 can be integrated onto a common connecting plate 14, while the first template 11 is provided with a number of grooves 13 matching the number of protrusions 12. The screw extruder can also be configured with multiple protrusions 12, or connected to the injection holes 16 on the protrusions 12 via a die head or other connecting parts. Example

[0048] This embodiment provides a two-wheeled vehicle mudguard 7 processing mold equipment with another structural form. Its basic principle is the same as that of the embodiment, that is, the volume of the forming chamber 4 is dynamically adjusted by the independent drive structure 5, but the sliding insert is set on the side of the concave mold 2.

[0049] In the mold assembly of this embodiment, a sliding insert is disposed on the side of the die cavity 2. Specifically, the die cavity 2 includes a second template 22 as a template assembly and a push plate 23 as the sliding insert. The second template 22 is also provided with a groove 13, in which the push plate 23 can slide. The groove 21 provided on the die cavity 2 is defined by the push plate 23 and the groove 13.

[0050] The punch 1 has a fixed protrusion 17 whose shape matches the inner surface 71 of the mudguard 7. The forming chamber 4 is formed between the protrusion 17 of the punch 1 and the push plate 23 in the die 2.

[0051] The mold assembly also includes a fixing frame 6 and a guide rod 61. In this embodiment, the punch 1 is fixedly connected to the guide rod 61 and is a fixed component. The two parts of the die 2, the second template 22 and the push plate 23, are both slidably connected to the guide rod 61. A mating plate 24 can be provided on the push plate 23.

[0052] The output end of the mold closing drive 3 is connected to the second template 22 and is used to drive the second template 22 to move closer to or away from the fixed punch 1.

[0053] The output end of the independent drive structure 5 is connected to the docking plate 24, and the docking plate 24 is fixed to the push plate 23. That is, the independent drive structure 5 is connected to the push plate 23 and is used to drive the push plate 23 to move independently.

[0054] During operation, the mold closing drive 3 drives the second template 22 to complete mold closing. During the injection molding process, the independent drive structure 5 drives the push plate 23, causing the push plate 23 to move in the slide groove 13, thereby changing the gap size between the push plate 23 and the protrusion 17 of the punch 1, realizing dynamic adjustment of the volume of the molding chamber 4 or realizing vacuum injection molding.

[0055] This embodiment may also include an ejection mechanism. Specifically, a connecting rod may be provided on the second template 22 or the mating plate 24, and a push rod is connected to the connecting rod. A through hole is provided on the fixed punch 1 at a corresponding position. The position of the through hole at least partially intersects with the forming chamber 4.

[0056] The demolding process can be as follows: After the mold opens, the entire die 2 retracts. The mudguard 7 remains on the punch 1. When the entire die 2 retracts to a position where the push rod on the connecting rod slides in the through hole to contact the mudguard 7, regardless of whether the entire die 2 retracts, the second template 22 retracts alone, or the push plate 23 retracts alone, the push rod can be moved according to the position of the connecting rod, such as on the second template 22 or on the mating plate 24, and the push rod extends outward in the through hole, thus removing the mudguard 7 from the die 2.

[0057] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A two-wheeled vehicle mudguard processing mold equipment, comprising: A punch, a die, and a mold closing drive that moves the punches closer and further apart; the punches and the die form a molding cavity after docking. Its features are, At least one of the punches or the dies includes a template assembly and a sliding insert; The template assembly is provided with a sliding groove, and the sliding insert slides in the sliding groove; the template assembly is also provided with an independent driving structure for driving the sliding insert to move within the sliding groove; The independent drive structure is configured to dynamically adjust the volume of the molding chamber by changing the relative distance between the sliding insert and the opposing mold during the injection molding process.

2. The equipment for processing mudguards for two-wheeled vehicles according to claim 1, characterized in that: The sliding insert is disposed on the punch side; the punch includes a first template as the template assembly and a protruding plate as the sliding insert; The die has a groove; the independent drive structure directly or indirectly drives the convex plate to move in the groove of the first template to change the gap between the convex plate and the groove.

3. The equipment for processing mudguards for two-wheeled vehicles according to claim 1, characterized in that: The sliding insert is disposed on the die cavity side; the die cavity includes a second template as the template assembly, and a push plate as the sliding insert; The punch has a protrusion; the independent drive structure drives the push plate to move in the groove of the second template to change the gap between the push plate and the protrusion.

4. The equipment for processing mudguards for two-wheeled vehicles according to claim 2, characterized in that: The first template is provided with an arc-shaped convex surface, which matches the outer edge surface of the mudguard; The convex plate, the groove, and the arc-shaped convex surface together constitute the molding chamber.

5. The equipment for processing mudguards for two-wheeled vehicles according to claim 2, characterized in that: When the punch and the die are demolded, after the first template and the punch plate move away from the die at the same time, the independent driving structure drives the punch plate to move into the groove of the first template.

6. The equipment for processing mudguards for two-wheeled vehicles according to claim 2, characterized in that: The convex plate is provided with injection holes that are compatible with the screw extruder.

7. The equipment for processing mudguards for two-wheeled vehicles according to claim 2, characterized in that: The mold equipment also includes a fixing frame and a guide rod. A connecting plate is provided on the convex plate. The convex plate is fixed to the guide rod through the connecting plate. The concave mold and the first template are both slidably connected to the guide rod. Both the mold closing drive and the independent drive structure are mounted on the fixed frame. The output end of the mold closing drive is connected to the cavity mold, and the output end of the independent drive structure is connected to the first template.

8. The equipment for processing mudguards for two-wheeled vehicles according to claim 7, characterized in that: Multiple convex plates and grooves are provided, and the multiple convex plates directly or indirectly cooperate with the screw extruder. The number of grooves in the first template matches the number of convex plates.

9. The equipment for processing mudguards for two-wheeled vehicles according to claim 3, characterized in that: The mold equipment also includes a fixing frame and a guide rod. A docking plate is provided on the push plate. The push plate is slidably connected to the guide rod through the connecting plate. The second template is slidably connected to the guide rod. The punch is fixed to the guide rod. Both the mold closing drive and the independent drive structure are mounted on the fixed frame. The output end of the mold closing drive is connected to the push plate, and the output end of the independent drive structure is connected to the second template.

10. The equipment for processing mudguards for two-wheeled vehicles according to claim 9, characterized in that: The second template is provided with a connecting rod, the connecting rod is provided with a push rod, the punch is provided with a through hole, and the push rod is slidably engaged with the through hole; The location of the through hole intersects at least partially with the molding chamber.

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