An injection molding product shaping device and its working method

Abstract

The present invention discloses an injection molding product shaping device and a working method. The shaping device includes a workbench, on which a loading and unloading mechanism, a positioning mechanism and a shaping mechanism are provided. The positioning mechanism includes a base, a fixture mounting plate and a fixture. The fixture includes a bottom fixing plate and a positioning block. The side wall of the injection molding product is flush with or protrudes from the outer edge of the bottom fixing plate. The positioning column corresponds to the positioning hole of the fixture mounting plate, and a profiling pressing surface is provided on the side close to the fixture, and the shape matches the contours of the fixture and the product. The lifting mechanism drives the positioning column to lift and lower, so that the profiling pressing surface selectively presses the fixture or synchronously presses the fixture and the side end of the product. The present invention realizes dynamic adaptation through the profiling pressing surface of the positioning column: for low-deformation products, only the fixture is pressed, avoiding surface damage caused by excessive restraint; for high-deformation or burr products, the fixture and the side end of the product are synchronously pressed, accurately suppressing displacement and guiding material shrinkage to ensure dimensional accuracy. A single positioning column integrates dual limiting functions, eliminating multiple sets of fixtures and complex adjustment mechanisms.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molded part production and processing equipment, and particularly relates to an injection molded product shaping device and its working method. Background Art

[0002] The core task of an injection molded product shaping device is to correct product deformation and improve dimensional accuracy through the cooperation of a fixture and a limiting mechanism. In the prior art, a typical solution is to fix the fixture through positioning posts, and then limit the product by the positioning structure (such as side wall buckles or bolts) of the fixture. For example, a common design fixes the whole fixture by pressing the bottom of the fixture with positioning posts, and the side wall of the fixture is provided with limiting grooves or clamping claws, and the side end of the product is locked by bolts. This solution relies on the rigid constraint of the fixture itself. Although it can adapt to some scenarios, it has significant limitations.

[0003] In actual production, the same injection molded product may present different deformation states due to fluctuations in the injection molding process (such as uneven temperature, insufficient pressure holding, or mold wear). When the deformation of the product is small or only simple planar correction is required, only fixing the fixture without forcibly limiting the side end of the product has obvious advantages: avoiding overconstraint: low-deformation products can freely rebound during the hot pressing process, reducing stress concentration or surface indentation caused by lateral limiting; simplifying the operation process: there is no need to additionally lock the side end of the product, shortening the clamping time and improving the production line efficiency; reducing cost risks: avoiding potential damage to high-precision products (such as optical elements, thin-walled parts) by complex limiting mechanisms.

[0004] However, if there is large deformation or burrs on the side wall of the product, it is necessary to fix the fixture and the side end of the product simultaneously to ensure shaping accuracy: suppressing displacement: lateral limiting can prevent the material from shifting due to softening during the hot pressing process; precise correction: applying directional constraints to the deformed area to guide the material to shrink towards the target shape.

[0005] To address these two different requirements, the prior art needs to design two sets of independent fixtures - one only fixes the fixture, and the other integrates a lateral limiting structure. This separated design not only increases the fixture development and maintenance costs, but also requires downtime to replace the fixture or manual adjustment of the limiting mechanism during tool change, resulting in a significant decrease in production efficiency. This rigid adaptation logic is difficult to meet the dynamic production requirements, especially in the scenarios of high-value-added and multi-batch products, where the yield and cost control face huge challenges. Summary of the Invention

[0006] Object of the Invention: The object of the present invention is to provide an injection molded product shaping device and its working method to solve the problem of overconstraint or insufficient limiting caused by a single positioning mode in the prior art.

[0007] Technical Solution:

[0008] An injection-molded product shaping device, including a workbench, and an up-and-down feeding mechanism, a positioning mechanism, and a shaping mechanism for the injection-molded product are arranged at the upper end of the workbench;

[0009] The positioning mechanism includes:

[0010] A base, installed at the upper end of the workbench;

[0011] A fixture mounting plate, arranged at the upper end of the base, and a plurality of positioning holes are formed on the surface;

[0012] A fixture, including a bottom fixing plate and a positioning block, the bottom fixing plate is connected to the fixture mounting plate, and its outer edge extends to the side end of the positioning hole area, and the positioning block is arranged on the bottom fixing plate for fixing the injection-molded product;

[0013] At least part of the side wall of the injection-molded product is flush with or protrudes outward from the outer edge of the bottom fixing plate;

[0014] Positioning columns, corresponding to the positioning holes one by one, and a profiling pressing surface is arranged on the side of the positioning column close to the fixture, and the shape of the profiling pressing surface matches the outer edge of the bottom fixing plate and the extended side wall of the injection-molded product;

[0015] A lifting mechanism, driving the positioning column to move vertically, when the positioning column rises, the profiling pressing surface can selectively press the bottom fixing plate or simultaneously press the bottom fixing plate and the extended side wall of the injection-molded product.

[0016] Furthermore, at least part of the side wall of the injection-molded product protrudes outward from the bottom fixing plate, and the protruding part is located within the area where the positioning hole is located. The profiling pressing surface includes a fixture fixing section and a product fixing section; the fixture fixing section is located at the lower part of the positioning column, and its shape matches the outer edge of the bottom fixing plate; the product fixing section is located at the upper part of the positioning column, and its shape matches the contour of the protruding side wall of the injection-molded product.

[0017] Furthermore, the protruding part of the injection-molded product is flush or gradually increases from bottom to top.

[0018] Furthermore, at least three side walls of the injection-molded product that are not all within the same semi-circular area on the same side are flush with or protrude outward from the outer edge of the bottom fixing plate.

[0019] Furthermore, the positioning mechanism further includes a locking column and a locking hole. The locking hole is formed on the fixture mounting plate. The lifting mechanism synchronously drives the locking column and the positioning column to lift and lower. The locking column cooperates with the locking hole to fix the relative position of the fixture mounting plate and the base.

[0020] Furthermore, the shaping mechanism includes a shaping mold and a shaping cylinder for controlling the lifting of the shaping mold.

[0021] Furthermore, the loading and unloading mechanism includes a loading and conveying assembly, a grabbing assembly and a flipping and unloading assembly. The loading and conveying assembly includes a loading conveyor belt and a conveying tool for the injection molded product arranged above the loading conveyor belt; the grabbing assembly includes a multi-degree-of-freedom manipulator; the flipping and unloading assembly includes a rotating cylinder and two centrally symmetrical unloading tools connected to the rotating cylinder.

[0022] Furthermore, the feeding conveyor belt is a screw structure, the conveying tool is transmission-connected to the screw structure via a movable seat, and two conveying tools are arranged on each movable seat; the freedom manipulator includes two grasping devices.

[0023] The present invention also discloses a working method of an injection molded product shaping device, wherein at least a portion of the side wall of the injection molded product is flush with the outer edge of the bottom fixing plate, comprising the following steps:

[0024] S1. The loading and unloading mechanism cooperates with the positioning mechanism to fix the injection molded product on the bottom fixing plate of the fixture;

[0025] S2, Selective horizontal limit:

[0026] If the injection molded product does not require lateral limit, the lifting mechanism drives the positioning column to rise to the first height, at which time the contoured pressing surface only performs horizontal limit fixation on the bottom fixing plate;

[0027] If the injection molded product needs lateral limitation, the lifting mechanism drives the positioning column to rise to the second height, at which time the contoured pressing surface simultaneously limits and fixes the bottom fixing plate and the injection molded product horizontally;

[0028] S3, start the shaping mechanism to shape the injection molded product;

[0029] S4. After the shaping is completed, the lifting mechanism drives the positioning column to descend and reset, and the loading and unloading mechanism transfers the finished product to the next process.

[0030] Furthermore, in step S2, the injection molded product needs to be laterally limited, and the lifting mechanism drives the positioning column to rise to a second height. At this time, the clamp fixing section of the contoured pressing surface horizontally limits and fixes the bottom fixing plate, and the product fixing section also horizontally limits and fixes the injection molded product.

[0031] Beneficial effects:

[0032] 1. The core innovation of the present invention lies in selectively pressing the fixture or synchronously pressing the fixture and the product side end through the profiling pressing surface of the positioning post, achieving dynamic adaptation to the requirements of different product states. Its significant advantages are as follows: When shaping low-deformation products, only fixing the side end of the fixture can avoid surface indentation or stress concentration caused by excessive restraint, while simplifying the operation process and reducing cost risks; when shaping high-deformation or burr products, synchronously pressing the fixture and the product side end can accurately suppress displacement and guide the material to contract directionally, ensuring dimensional accuracy and yield.

[0033] 2. By integrating dual limiting functions into a single positioning post, eliminating traditional multiple sets of fixtures or complex adjustment mechanisms, the complexity of the equipment and the manufacturing cost are significantly reduced, and the changeover efficiency is remarkably improved, especially suitable for the flexible production requirements of multi-batch and high-value-added products. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a perspective view of the present invention;

[0035] Figure 2 is an enlarged perspective view of the position of the positioning mechanism and the shaping mechanism of the present invention;

[0036] Figure 3 is an enlarged perspective view of the flipping and blanking assembly of the present invention;

[0037] Figure 4 is an enlarged perspective view of the positioning mechanism of the present invention;

[0038] Figure 5 is the working principle diagram of the positioning post of the present invention;

[0039] Figure 6 is a schematic diagram of the fixture fixing section and the product fixing section of the positioning post of the present invention;

[0040] Figure 7 is a schematic diagram of the locking post and the locking hole of the present invention;

[0041] Reference numerals: 1, workbench; 2, loading and unloading mechanism; 21, loading conveying assembly; 211, loading conveyor belt; 212, conveying tooling; 213, moving seat; 22, grasping assembly; 23, flipping and blanking assembly; 231, rotating cylinder; 232, blanking tooling; 3, positioning mechanism; 31, base; 32, fixture mounting plate; 33, fixture; 331, bottom fixing plate; 332, positioning block; 34, positioning hole; 35, positioning post; 351, profiling pressing surface; 3511, fixture fixing section; 3512, product fixing section; 36, lifting mechanism; 37, locking post; 38, locking hole; 4, shaping mechanism; 41, shaping die; 42, shaping cylinder; 5, injection molded product. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] To make the technical solution of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.

[0043] Embodiment 1

[0044] As Figure 1-7 shown, an injection product shaping device includes a workbench 1, and a loading and unloading mechanism 2, a positioning mechanism 3, and a shaping mechanism 4 for the injection product 5 are arranged at the upper end of the workbench 1;

[0045] The positioning mechanism 3 includes:

[0046] A base 31, installed at the upper end of the workbench 1;

[0047] A fixture mounting plate 32, arranged at the upper end of the base 31, with a plurality of positioning holes 34 formed on its surface;

[0048] A fixture 33, including a bottom fixing plate 331 and a positioning block 332. The bottom fixing plate 331 is connected to the fixture mounting plate 32, and its outer edge extends to the side end of the positioning hole 34 area. The positioning block 332 is arranged on the bottom fixing plate 331 and is used to fix the injection product 5; the base 31 and the fixture mounting plate 32 form a stable support structure, and the outer extension of the bottom fixing plate 331 to the positioning hole 34 area provides a space basis for the subsequent pressing action of the positioning post 35, ensuring the precise alignment of the fixture 33 and the positioning post 35;

[0049] At least part of the side wall of the injection product 5 is flush with or protrudes from the outer edge of the bottom fixing plate 331; through the protruding or flush design, a continuous or extended surface is formed between the product side wall and the side end of the fixture, providing a matching contact area for the profiling pressing surface 351 of the positioning post 35 and ensuring the limiting accuracy;

[0050] Positioning posts 35, corresponding to the positioning holes 34 one by one. A profiling pressing surface 351 is arranged on the side of the positioning post 35 close to the fixture 33, and the shape of the profiling pressing surface 351 matches the outer edge of the bottom fixing plate 331 and the extended side wall of the injection product 5; the profiling pressing surface 351 matches the fixture and the product contour, and uniform pressure distribution is achieved through physical fitting, avoiding local overpressure or underpressure and improving the shaping consistency;

[0051] A lifting mechanism 36 drives the positioning posts 35 to move vertically. When the positioning posts 35 rise, the profiling pressing surface 351 can selectively press the bottom fixing plate 331 or simultaneously press the bottom fixing plate 331 and the extended side wall of the injection product 5; the lifting mechanism 36 realizes two pressing modes through height control - only fixing the fixture or synchronously fixing the fixture and the product, dynamically adapting to different deformation states and solving the defects of traditional limiting.

[0052] Furthermore, at least a part of the side wall of the injection molded product 5 protrudes outward from the bottom fixing plate 331, and the protruding part is located within the area where the positioning holes are located. The profiling pressing surface 351 includes a fixture fixing section 3511 and a product fixing section 3512; the fixture fixing section 3511 is located below the positioning post 35, and its shape matches the outer edge of the bottom fixing plate 331; the product fixing section 3512 is located above the positioning post 35, and its shape matches the contour of the protruding side wall of the injection molded product 5. The split profiling pressing surface 351 is designed with upper and lower segments to adapt to the profiles of the fixture and the product respectively, achieving precise positioning. The fixture fixing section 3511 preferably presses the fixture tightly to ensure basic stability; the product fixing section 3512 applies constraints to the protruding side wall to inhibit displacement. It can perform targeted positioning for different products.

[0053] Furthermore, the protruding part of the injection molded product 5 is flush or gradually increases from bottom to top. The flush design of the protruding part is suitable for products with simple structures (such as rectangular bosses), and the gradually increasing design is suitable for conical or curved products (such as automotive lamp housings). By matching the gradient contour with the material shrinkage direction, stress residue can be reduced.

[0054] Furthermore, at least three side walls of the injection molded product 5 that are not all within the same semi - circle on the same side are flush with or protrude from the outer edge of the bottom fixing plate 331. The asymmetrical distribution of multiple side walls avoids stress concentration, and at the same time disperses the pressing force of the positioning posts 35, ensuring that the product is evenly stressed during the shaping process and preventing deformation or damage caused by unilateral overload.

[0055] As Figure 7 shown, the positioning mechanism 3 further includes a locking post 37 and a locking hole 38. The locking hole 38 is opened on the fixture mounting plate 32. The lifting mechanism 36 synchronously drives the locking post 37 and the positioning post 35 to lift and lower. The locking post 37 cooperates with the locking hole 38 to fix the relative position of the fixture mounting plate 32 and the base 31. The locking post 37 and the positioning post 35 are lifted and lowered synchronously. Before pressing the product, the fixture mounting plate 32 is fixed first to eliminate the risk of relative displacement between the fixture and the base 31, improve the system rigidity, and ensure the shaping accuracy.

[0056] Furthermore, the shaping mechanism 4 includes a shaping die 41 and a shaping cylinder 42 for controlling the lifting and lowering of the shaping die 41. The shaping die 41 is driven by a cylinder to achieve rapid pressing down and resetting. Combining hot - pressing or cold - pressing processes, a directional corrective force is applied to the deformed area to restore the designed dimensions of the product.

[0057] Furthermore, the loading and unloading mechanism 2 includes a loading and conveying assembly 21, a grabbing assembly 22 and a flipping and unloading assembly 23. The loading and conveying assembly 21 includes a loading conveyor belt 211 and a conveying fixture 212 for injection molded products arranged above the loading conveyor belt 211; the grabbing assembly 22 includes a multi-degree-of-freedom manipulator; the flipping and unloading assembly 23 includes a rotating cylinder 231 and two centrally symmetrical unloading fixtures 232 connected to the rotating cylinder. The loading conveyor belt 211 and the manipulator cooperate to realize automatic loading, and the flipping and unloading assembly 23 quickly transfers finished products through the centrally symmetrical fixture, reducing manual intervention, and shortening the single-piece processing cycle by more than 20%.

[0058] Furthermore, the feeding conveyor belt 211 is a screw structure, the conveying fixture 212 is connected to the screw structure through a moving seat 213, and two conveying fixtures 212 are arranged on each moving seat 213; the freedom manipulator includes two grippers. The screw drive ensures high-precision positioning of the conveying fixture 212, and the double fixture design improves the feeding efficiency; the double gripping manipulator supports parallel operation, further shortening the cycle time.

[0059] Example 2

[0060] The present invention also discloses a working method of an injection molding product shaping device, wherein at least a portion of the side wall of the injection molding product 5 is flush with the outer edge of the bottom fixing plate 331, comprising the following steps:

[0061] S1, the loading and unloading mechanism 2 cooperates with the positioning mechanism 3 to fix the injection molded product 5 on the bottom fixing plate 331 of the fixture 33;

[0062] S2, Selective horizontal limit:

[0063] If the injection molded product does not require lateral positioning, the lifting mechanism 36 drives the positioning column 35 to rise to a first height, at which time the contoured pressing surface 351 only performs horizontal positioning and fixing of the bottom fixing plate 331;

[0064] If the injection molded product needs to be laterally limited, the lifting mechanism 36 drives the positioning column 35 to rise to the second height, at which time the contoured pressing surface 351 simultaneously limits and fixes the bottom fixing plate 331 and the injection molded product horizontally;

[0065] The limit mode is automatically selected according to the product deformation. Low-deformation products avoid excessive constraints, and high-deformation products accurately suppress displacement, and the yield rate is increased to more than 98%. The deformation can be detected by visual sensors;

[0066] S3, start the shaping mechanism 4 to shape the injection molded product 5;

[0067] S4. After the shaping is completed, the lifting mechanism 36 drives the positioning column 35 to descend and reset, and the loading and unloading mechanism 2 transfers the finished product to the next process.

[0068] Further, in step S2, the injection molded product needs lateral limit. The lifting mechanism 36 drives the positioning column 35 to rise to the second height. At this time, the fixture fixing section 3511 of the profiling pressing surface 351 horizontally limits and fixes the bottom fixing plate 331, and the product fixing section 3512 simultaneously horizontally limits and fixes the injection molded product 5; the staged pressing logic preferentially fixes the fixture and then restricts the side end of the product to avoid the offset of the fixture caused by simultaneous pressing, ensuring the stability of the system.

[0069] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. An injection molding product shaping device, characterized in that: It comprises a workbench (1), wherein the upper end of the workbench (1) is provided with a loading and unloading mechanism (2), a positioning mechanism (3), and a shaping mechanism (4) for an injection molded product (5); The positioning mechanism (3) comprises: A base (31) mounted on the upper end of the workbench (1); A fixture mounting plate (32) is disposed on the upper end of the base (31) and has a plurality of positioning holes (34) formed on its surface; The clamp (33) comprises a bottom fixing plate (331) and a positioning block (332), wherein the bottom fixing plate (331) is connected to the clamp mounting plate (32), and its outer edge extends to the side end of the positioning hole (34) area, and the positioning block (332) is arranged on the bottom fixing plate (331) and is used to fix the injection molded product (5); At least part of the side wall of the injection molded product (5) is flush with or convex to the outer edge of the bottom fixing plate (331); The positioning posts (35) correspond to the positioning holes (34) one by one, and a contoured pressing surface (351) is provided on one side of the positioning posts (35) close to the clamp (33), wherein the contoured pressing surface (351) matches the outer edge of the bottom fixing plate (331) and the extended side wall of the injection molded product (5); The lifting mechanism (36) drives the positioning column (35) to move vertically. When the positioning column (35) rises, the contoured pressing surface (351) can selectively press the bottom fixing plate (331) or simultaneously press the bottom fixing plate (331) and the extended side wall of the injection molded product (5).

2. The device for shaping injection molded products according to claim 1, characterized in that: At least part of the side wall of the injection molded product (5) protrudes outward from the bottom fixing plate (331), and the protruding part is located in the area where the positioning hole is located. The contoured pressing surface (351) comprises a clamp fixing section (3511) and a product fixing section (3512); the clamp fixing section (3511) is located at the bottom of the positioning column (35), and its shape matches the outer edge of the bottom fixing plate (331); the product fixing section (3512) is located at the top of the positioning column (35), and its shape matches the contour of the protruding side wall of the injection molded product (5).

3. The device for shaping injection molded products according to claim 2, characterized in that: The convex part of the injection molded product (5) is flush or gradually increases from bottom to top.

4. The device for shaping injection molded products according to claim 1, characterized in that: At least three side walls of the injection molded product (5) that are not entirely within the semicircle on the same side are flush with or convex to the outer edge of the bottom fixing plate (331).

5. The device for shaping injection molded products according to claim 1, characterized in that: The positioning mechanism (3) further comprises a locking column (37) and a locking hole (38), wherein the locking hole (38) is formed on the fixture mounting plate (32), and the lifting mechanism (36) synchronously drives the locking column (37) and the positioning column (35) to rise and fall, and the locking column (37) and the locking hole (38) cooperate to fix the relative position of the fixture mounting plate (32) and the base (31).

6. The device for shaping injection molded products according to claim 1, characterized in that: The shaping mechanism (4) comprises a shaping die (41) and a shaping cylinder (42) for controlling the lifting and lowering of the shaping die (41).

7. The device for shaping injection molded products according to claim 1, characterized in that: The loading and unloading mechanism (2) comprises a loading and conveying assembly (21), a gripping assembly (22) and a flipping and unloading assembly (23); the loading and conveying assembly (21) comprises a loading and conveying belt (211) and a conveying fixture (212) for injection molded products arranged above the loading and conveying belt (211); the gripping assembly (22) comprises a multi-degree-of-freedom manipulator; and the flipping and unloading assembly (23) comprises a rotating cylinder (231) and two centrally symmetrical unloading fixtures (232) connected to the rotating cylinder (231).

8. The device for shaping injection molded products according to claim 7, characterized in that: The loading conveyor belt (211) is a lead screw structure, the conveying tool (212) is transmission-connected to the lead screw structure via a moving seat (213), and two conveying tool (212) are arranged on each moving seat (213); the freedom manipulator includes two grippers.

9. A working method using the injection molding product shaping device according to claim 1, characterized in that: The injection molded product (5) has at least a portion of its side wall flush with the outer edge of the bottom fixing plate (331), comprising the following steps: S1, the loading and unloading mechanism (2) cooperates with the positioning mechanism (3) to fix the injection molded product (5) on the bottom fixing plate (331) of the fixture (33); S2, Selective horizontal limit: If the injection molded product does not require lateral positioning, the lifting mechanism (36) drives the positioning column (35) to rise to a first height, at which time the contoured pressing surface (351) only performs horizontal positioning and fixing on the bottom fixing plate (331); If the injection molded product needs to be limited laterally, the lifting mechanism (36) drives the positioning column (35) to rise to a second height, at which time the contoured pressing surface (351) simultaneously limits and fixes the bottom fixing plate (331) and the injection molded product horizontally; S3, starting the shaping mechanism (4) to shape the injection molded product (5); S4. After the shaping is completed, the lifting mechanism (36) drives the positioning column (35) to descend and reset, and the loading and unloading mechanism (2) transfers the finished product to the next process.

10. The working method of the injection molding product shaping device according to claim 9, characterized in that: At least part of the side wall of the injection molded product (5) protrudes outward from the bottom fixing plate (331), and the protruding part is located in the area where the positioning hole is located. The contoured pressing surface (351) comprises a clamp fixing section (3511) and a product fixing section (3512); the clamp fixing section (3511) is located at the bottom of the positioning column (35), and its shape matches the outer edge of the bottom fixing plate (331); the product fixing section (3512) is located at the top of the positioning column (35), and its shape matches the contour of the protruding side wall of the injection molded product (5). In step S2, the injection molded product needs to be laterally limited, and the lifting mechanism (36) drives the positioning column (35) to rise to a second height. At this time, the clamp fixing section (3511) of the contoured pressing surface (351) horizontally limits and fixes the bottom fixing plate (331), and the product fixing section (3512) simultaneously horizontally limits and fixes the injection molded product (5).

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