Injection molding part auxiliary shaping jig and shaping method thereof

Abstract

This invention relates to the field of auxiliary forming technology for injection molded parts, and provides an auxiliary forming fixture and forming method for injection molded parts, including a lower plate structure and an upper plate structure for adaptive installation; the lower plate structure includes a plate body with a plurality of limiting blocks arranged in a matrix on the plate body, and a set of adapting grooves corresponding to each set of limiting blocks on the plate body; the adapting grooves are recessed and suspended from a first part; a forming column is provided above the first part, and the forming column is used to assist in forming; a set of height-adjustable forming columns is independently provided above the first part of each workpiece. The operator can independently adjust the extension length of each ejector pin by rotating the headless screw according to the pre-measured actual warpage data of each workpiece, realizing one-to-one reverse compensation for the warpage of each workpiece, improving the dimensional consistency and process capability index of batch product forming.

Description

Technical Field

[0001] This invention relates to the field of auxiliary shaping technology for injection molded parts, and more specifically, to an auxiliary shaping fixture for injection molded parts and a shaping method thereof. Background Technology

[0002] After demolding, residual stress in injection-molded plastic parts gradually releases, making them prone to warping and localized deformation, leading to dimensional deviations and failure to meet assembly precision requirements. Currently, the industry commonly employs baking stress relief and fixture-based positioning processes to assist in shaping injection-molded parts, reducing warping and improving product dimensional stability.

[0003] Existing forming fixtures are mostly integral pressure plate structures that press the workpiece as a whole into the fixture cavity for baking in the furnace. However, in this type of fixture, the entire area of ​​the workpiece is rigidly pressed, limiting the path for internal stress release and easily causing new stress concentrations in local areas, thus limiting the effect of auxiliary forming and correction. In addition, the uniform pressing height of multi-station fixtures makes it impossible to independently adjust and compensate for the actual warpage of individual workpieces. For workpieces with inconsistent warpage, targeted forming cannot be achieved, resulting in poor dimensional consistency of batch products, difficulty in improving the dimensional process capability index, and inability to meet the production requirements of high-precision injection molded parts. This paper proposes an auxiliary forming fixture for injection molded parts and its forming method to improve the existing problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide an auxiliary shaping fixture for injection molded parts and a shaping method thereof.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A jig for auxiliary forming of injection molded parts includes a lower plate structure and an upper plate structure for fitting and mounting. The lower plate structure includes a plate body, and two transfer handles are fixedly connected to both ends of the plate body by bolts. The two transfer handles are used to transfer and transport the jig composed of the lower plate structure and the upper plate structure. A plurality of limiting blocks are arranged in a matrix on the plate body, and a set of fitting grooves is formed on the plate body corresponding to each set of limiting blocks. The workpiece includes a first part and a second part integrally formed with the first part, and the workpiece is placed outside the limiting blocks. The fitting grooves are recessed, and the fitting grooves are perpendicular to the first part. The structure is suspended; a shaping column is provided above the first part to assist in shaping; the upper plate structure includes a limiting plate and a cover plate on top of the limiting plate; an adapter hole is provided through the limiting plate; an adjustment hole is provided through the cover plate; the adjustment hole and the adapter hole are connected; the shaping column is provided through the adjustment hole and the adapter hole in sequence; the bottom of the shaping column is in contact with the top of the first part; a set of positioning members is provided at the bottom of the limiting plate for each set of limiting blocks; the positioning members are used to limit the top of the second part after the lower plate structure and the upper plate structure are fastened together.

[0006] The present invention is further configured such that: the limiting block and the plate are integrally formed; when the workpiece is placed outside the limiting block, the limiting block is used to position the workpiece; after the lower plate structure and the upper plate structure are fastened together, the limiting block radially limits the workpiece.

[0007] The present invention is further configured such that: the limiting block includes a main body, and a first limiting part, a second limiting part, a third limiting part, a fourth limiting part, and a fifth limiting part are integrally formed around the outer side of the main body; each connection point between the first limiting part, the second limiting part, the third limiting part, the fourth limiting part, and the fifth limiting part is provided with an arc transition structure; the adapter groove is configured with an L-shaped structure, and the adapter groove is arranged around the third limiting part, the fourth limiting part, and the fifth limiting part.

[0008] The present invention is further configured such that: the positioning component includes a first positioning block, a second positioning block and a third positioning block arranged in sequence, the first positioning block, the second positioning block and the third positioning block are all configured as rectangular structures, and the first positioning block, the second positioning block and the third positioning block are respectively used to limit the triangular position at the top of the second part when the lower plate structure and the upper plate structure are fastened together.

[0009] The present invention is further configured such that: two sets of cover handles are symmetrically arranged on the top of the cover plate, and the two sets of cover handles are respectively fixedly connected to the cover plate by bolts.

[0010] The present invention is further configured such that: a plurality of fixing posts are provided through the top of the cover plate, the fixing posts being fixing bolts; when the lower plate structure is fastened to the upper plate structure, the fixing posts are provided through the cover plate, the limiting plate and the plate body in sequence, and the fixing posts are used to limit the cover plate, the limiting plate and the plate body.

[0011] The present invention is further configured such that: a plurality of connecting posts are provided between the limiting plate and the cover plate, the connecting posts being arranged sequentially through the bottom of the limiting plate and the cover plate, the connecting posts being countersunk bolts, and the connecting posts being used to fix and connect the limiting plate and the cover plate.

[0012] The present invention is further configured such that: a plurality of connecting posts are also provided through the top of the limiting plate, the top of the connecting posts are flush with the top of the adjustment hole, the end of the connecting posts is provided through the bottom of the limiting plate, and the end of the connecting posts is configured as a round head structure. When the lower plate structure and the upper plate structure are fastened together, the end of the connecting posts passes through the positioning hole on the plate body.

[0013] The present invention is further configured such that: the shaping column includes a ejector pin and a headless screw disposed on the top of the ejector pin, the headless screw being disposed inside the adjustment hole; after obtaining the warp data of the workpiece, the position between the ejector pin and the workpiece is adjusted based on the warp data using the headless screw, so as to adapt to the auxiliary shaping of the workpiece by the shaping column in subsequent processes.

[0014] The present invention also provides a shaping method using an auxiliary shaping fixture for injection molded parts, comprising the following steps: S1. Obtain the warpage data for each workpiece.

[0015] S2. Place the workpieces sequentially on the plate, so that each workpiece is fitted outside the corresponding limiting block.

[0016] S3. Adjust the position and height of each shaping column based on the warping data, and fasten the lower plate structure (to the upper plate structure, and fix the lower plate structure to the upper plate structure with bolts).

[0017] S4. Place the fixed lower plate structure and upper plate structure into the oven to bake the workpiece. After baking, remove the lower plate structure and upper plate structure as a whole, disassemble the upper plate structure, remove the workpiece, and let the workpiece cool naturally.

[0018] In summary, this application includes at least one of the following beneficial technical effects: (1) By dividing the workpiece into functional zones and setting different limiting methods accordingly, the second part is rigidly limited to provide a stable reference, while the first part is provided with an adapter groove to form a suspended state, which provides physical space for the thermal expansion and residual stress release of the first part during the baking process, and improves the sufficiency and uniformity of stress release.

[0019] (2) A set of height-adjustable shaping columns is independently set above the first part of each workpiece. The operator can independently adjust the extension length of each pin by rotating the headless screw according to the pre-measured actual warpage data of each workpiece, realizing one-to-one reverse compensation for the warpage of each workpiece, and improving the dimensional consistency and process capability index of batch product shaping.

[0020] (3) The positioning components in the upper plate structure adopt a triangular layout of the first positioning block, the second positioning block and the third positioning block. Using the principle that three points determine a plane, the structure can limit the triangular area at the top of the second part from above when it is fastened. The structure provides deformation space through the suspended adapter groove and performs excessive deformation limit with the shaping column, so that the physical changes of the first part can develop freely without rigid constraints. At the same time, the deformation is controlled within the predetermined allowable range by the shaping column of the preset height. Through the collaborative mechanism of first release and then constraint, the internal stress release needs are met, excessive deformation is reduced, and the controlled adjustment of the workpiece size is realized during the baking process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an auxiliary shaping fixture for injection molded parts according to the present invention.

[0022] Figure 2 This is a schematic diagram of the lower plate structure in this invention.

[0023] Figure 3 for Figure 2 Top view.

[0024] Figure 4 for Figure 3 A magnified structural diagram of area A in the middle.

[0025] Figure 5 This is a schematic diagram of the structure of the first and second parts in this invention.

[0026] Figure 6 This is a schematic diagram of the upper plate structure in this invention.

[0027] Figure 7 This is a schematic diagram of the cover plate in this invention.

[0028] Figure 8 This is a schematic diagram of the connecting plate in this invention.

[0029] Figure 9 for Figure 8 A bottom view.

[0030] Figure 10 for Figure 9 A magnified structural diagram of area B in the middle.

[0031] Explanation of reference numerals in the attached drawings: 1. Lower plate structure; 11. Plate body; 12. Transfer handle; 13. Limiting block; 131. Main body; 132. First limiting part; 133. Second limiting part; 134. Third limiting part; 135. Fourth limiting part; 136. Fifth limiting part; 14. Adaptor groove; 2. Upper plate structure; 21. Limiting plate; 211. Adaptor hole; 212. Positioning component; 2121. First positioning block; 2122. Second positioning block; 2123. Third positioning block; 22. Cover plate; 221. Adjustment hole; 23. Cover handle; 24. Fixing post; 25. Connecting post; 26. Connecting post; 3. Plastic column; 4. Workpiece; 41. First part; 42. Second part. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0034] Please see Figures 1-10 Example 1, see Figure 1 A jig for auxiliary shaping of injection molded parts includes a lower plate structure 1 and an upper plate structure 2 disposed above the lower plate structure 1. The lower plate structure 1 and the upper plate structure 2 can be interlocked, and in the interlocked state, the workpiece 4 placed between them is limited and shaped.

[0035] See Figure 5 For ease of description, this paper defines the part of workpiece 4 that corresponds to the position of the adapter groove 14 and is suspended in the jig usage state as the first part 41, and the part of workpiece 4 that contacts the top surface of plate 11 and is supported by plate 11 in the jig usage state as the second part 42. The first part 41 and the second part 42 are integrally formed and connected.

[0036] After injection molding, the injection molded part is prone to warping and deformation during subsequent baking after demolding due to the presence of internal residual stress. In addition, in the existing device, the entire area of ​​the workpiece 4 is rigidly pressed, the internal stress release path is restricted, and new stress concentration is easily generated in local areas, resulting in limited shaping and correction effect. In the above structure, the workpiece 4 is divided into sections. Furthermore, a limiting method is set in the first part 41 and the second part 42, and a shaping definition in accordance with the present application is given.

[0037] See Figure 2First, the lower plate structure 1 includes a plate body 11. Several limiting blocks 13 are arranged in a matrix on the plate body 11. The number and arrangement of the limiting blocks 13 are determined according to the number and arrangement of the workpieces 4 to be processed. The limiting blocks 13 limit the workpieces 4. In this embodiment, the limiting blocks 13 are arranged in a matrix, with each limiting block 13 corresponding to the placement position of one workpiece 4. A set of adapter grooves 14 are respectively provided on the plate body 11 corresponding to each set of limiting blocks 13. The adapter grooves 14 are groove-shaped structures recessed into the top surface of the plate body 11.

[0038] Specifically, workpiece 4 is placed outside the limiting block 13, that is, workpiece 4 is fitted onto the outside of the limiting block 13, and the outer contour of the limiting block 13 matches the inner contour of workpiece 4, thereby positioning workpiece 4. After workpiece 4 is placed outside the limiting block 13, the bottom of the second part 42 contacts the top of the plate 11, and the plate 11 supports the second part 42. The adapter groove 14 is recessed on the top surface of the plate 11, and the adapter groove 14 is suspended from the first part 41, that is, the cavity formed by the adapter groove 14 is below the first part 41, and the first part 41 does not contact the plate 11. This suspended arrangement allows the first part 41 to be free from the constraint of the bottom surface of the plate 11 during the baking process, providing space and clearance for the physical changes of the first part 41 during the baking process (such as deformation accompanied by thermal expansion and stress release). Correspondingly, the second part 42 obtains bottom support due to contact with the plate 11, and will be limited and fixed after being fastened with the upper plate structure 2.

[0039] See Figure 3 and Figure 4 The specific structure of the limiting block 13 is as follows: the limiting block 13 and the plate 11 are integrally formed to ensure the positional accuracy and structural strength of the limiting block 13. The limiting block 13 includes a main body 131, and a first limiting part 132, a second limiting part 133, a third limiting part 134, a fourth limiting part 135, and a fifth limiting part 136 are integrally formed around the outer side of the main body 131. Each connection point between the first limiting part 132, the second limiting part 133, the third limiting part 134, the fourth limiting part 135, and the fifth limiting part 136 is provided with an arc transition structure. The limiting block 13 forms an outer contour shape that matches the inner cavity shape of the workpiece 4 through the above-mentioned multiple limiting parts. When the workpiece 4 is placed outside the limiting block 13, the limiting block 13 positions the workpiece 4. After the lower plate structure 1 and the upper plate structure 2 are fastened together, the limiting block 13 radially limits the workpiece 4, reducing the possibility of the workpiece 4 moving horizontally. In addition, the arc transition structure can reduce stress concentration at the connection of the limiting part and improve the structural durability of the limiting block 13 under repeated use and heating conditions.

[0040] See Figure 3 and Figure 4The adapter groove 14 is L-shaped and surrounds the third limiting part 134, the fourth limiting part 135 and the fifth limiting part 136. The L-shaped adapter groove 14 corresponds to the contour of the first part 41 of the workpiece 4, so that the first part 41 is suspended within the range of the adapter groove 14.

[0041] The above structure defines the mating structure between the limiting block 13, the adapter groove 14, and the workpiece 4 in the lower plate structure 1, so as to achieve the purpose of supporting and placing the workpiece 4 on the lower plate structure 1. In addition to the lower plate structure 1, the upper plate structure 2 also needs to be configured to shape the workpiece 4. Specifically, the upper plate structure 2 includes a limiting plate 21 and a cover plate 22 disposed on top of the limiting plate 21. The limiting plate 21 and the cover plate 22 are fixedly connected as a single module by connecting posts 25.

[0042] See Figure 9 and Figure 10 The bottom of the limiting plate 21 is provided with a set of positioning members 212 corresponding to each set of limiting blocks 13. The positioning members 212 are used to limit the top of the second part 42 from above after the lower plate structure 1 and the upper plate structure 2 are fastened together, so that the second part 42 is limited between the plate body 11 and the positioning members 212.

[0043] See Figure 8 and Figure 9 The positioning component 212 includes a first positioning block 2121, a second positioning block 2122, and a third positioning block 2123 arranged sequentially. The first positioning block 2121, the second positioning block 2122, and the third positioning block 2123 are all rectangular structures, and their positions on the bottom surface of the limiting plate 21 correspond to three predetermined limiting positions on the top of the second part 42. The first positioning block 2121, the second positioning block 2122, and the third positioning block 2123 are used to limit the top of the second part 42 to a triangular position from above when the lower plate structure 1 and the upper plate structure 2 are engaged. This triangular positioning layout utilizes the principle that three points determine a plane, ensuring that the second part 42 remains flat after being limited, which is beneficial for improving the positional stability of the second part 42 during baking; at the same time, it reduces the contact area with the workpiece, lowering the possibility of large-area pressing hindering the release of internal stress.

[0044] By setting the upper plate structure 2, the top of the workpiece 4 is limited. However, in the actual auxiliary shaping process, if the same shaping structure is directly set on the top of the first part 41, the pressing height will be consistent. Therefore, it is not possible to independently adjust and compensate for the actual warpage of a single workpiece 4. For workpieces 4 with inconsistent warpage, targeted shaping cannot be achieved. Therefore, it is necessary to make detailed adjustments for a single workpiece 4 and set corresponding shaping adjustments for a single workpiece 4. Specifically, a set of shaping columns 3 is set above each first part 41, that is, the shaping columns 3 correspond to the suspended setting. The shaping columns 3 are used to limit the deformation of the first part 41 during the baking process, thereby achieving auxiliary shaping.

[0045] See Figure 2 and Figure 6 A fitting hole 211 is provided through the limiting plate 21, and the position of the fitting hole 211 corresponds to the setting position of the shaping column 3. An adjustment hole 221 is provided through the cover plate 22, and the adjustment hole 221 and the fitting hole 211 are arranged vertically. The shaping column 3 is arranged through the adjustment hole 221 and the fitting hole 211 in sequence, and the bottom of the shaping column 3 extends from the bottom surface of the limiting plate 21 and contacts the top of the first part 41.

[0046] The shaping column 3 includes a ejector pin and a headless screw located on the top of the ejector pin. The headless screw is located inside the adjustment hole 221. The ejector pin extends downward from the bottom of the headless screw, passes through the adjustment hole 221 and the adapter hole 211 in sequence, and then extends out from the bottom surface of the limiting plate 21.

[0047] After measuring the warpage of workpiece 4, the length of the ejector pin extending downwards can be adjusted by rotating the headless screw, thereby adjusting the distance between the bottom of the ejector pin and the top of the first part 41 of workpiece 4. Since each workpiece 4 corresponds to a shaping post 3, each workpiece 4 can be adjusted independently, achieving reverse compensation based on the actual warpage data of each workpiece. The headless screw is located inside the adjustment hole 221 and is protected by the cover plate 22 after adjustment, preventing it from changing position due to external force, thus ensuring the reliability and consistency of shaping.

[0048] To facilitate intuitive reading of the adjustment amount of the shaping column 3 by the operator, in one optional embodiment, the inner wall of the adjustment hole 221 is provided with a scale line along the axial direction, and the top end face of the headless screw is provided with an indicator mark. When the operator rotates the headless screw with a tool, the position of the indicator mark relative to the scale line changes. The operator can read this position change to know the number of rotations or the axial displacement of the headless screw, thereby achieving precise and visual adjustment of the height of the shaping column 3.

[0049] In another alternative implementation, a reference mark is provided on the upper edge of the adjustment hole 221, and an angle scale is provided on the top end face of the headless screw. By reading the relative position of the angle scale and the reference mark, and combining it with the thread pitch of the headless screw, the operator can calculate the axial displacement of the ejector pin.

[0050] It should be noted that the above-mentioned scale indication method is only an optional implementation method for ease of operation and does not constitute a limitation on the adjustment method of the shaping column of the present invention.

[0051] Based on the above structure, the working principle of this fixture is as follows: First, the warpage of workpiece 4 is measured to obtain deformation data for each workpiece 4. Based on the measured warpage data, the deformation that needs to be restricted at the first part 41 of each workpiece 4 is calculated, thereby determining the required extension length of the ejector pin for each shaping column 3. Each ejector pin is adjusted to the corresponding height position by rotating the headless screw.

[0052] Then, the workpieces 4 are placed sequentially on the plate 11, so that each workpiece 4 is fitted outside the corresponding limiting block 13. At this time, the bottom of the second part 42 of the workpiece 4 is in contact with the top of the plate 11, and the plate 11 supports the second part 42; the first part 41 of the workpiece 4 is located above the adapter groove 14, forming a suspended state between it and the adapter groove 14.

[0053] Next, the upper plate structure 2 is fastened onto the lower plate structure 1. After fastening, the positioning piece 212 presses against the triangular position at the top of the second part 42 from above, together with the plate body 11, clamping and fixing the second part 42. At the same time, the bottom of the ejector pin of the shaping column 3 contacts the top of the first part 41 (or maintains a preset compensation distance). The cover plate 22, the limiting plate 21, and the plate body 11 are fixed together by the locking fixing column 24.

[0054] Finally, the combined structure of the lower plate structure 1 and the upper plate structure 2 is placed in the oven. During the baking process, the workpiece 4 is heated, and physical changes occur inside it (including deformation accompanied by thermal expansion and residual stress release).

[0055] For the second part 42, since it is clamped and fixed by the plate 11 and the positioning member 212, its positional stability is improved during the baking process, providing a stable positioning reference for the entire workpiece 4. For the first part 41, since it is suspended between itself and the fitting groove 14, it is not constrained by the plate 11 during the baking process, and the physical changes caused by heat (including deformation accompanied by thermal expansion and residual stress release) can occur at least partially within this suspended space. The first part 41 deforms during the above-mentioned physical changes, and this deformation can develop freely because it is not rigidly constrained. At the same time, the ejector pin of the shaping column 3 abuts against the top surface of the first part 41 from above. When the deformation of the first part 41 reaches a predetermined degree, the ejector pin limits the deformation of the first part 41 and controls it within a predetermined range. Since the height of the shaping column 3 is adjusted based on the previous warping measurement data, the allowable deformation of the first part 41 is pre-calculated and controlled.

[0056] During the above process, the first part 41 completes the physical change process in a suspended state. At the same time, the shaping column 3 prevents excessive deformation, so that the deformation of the first part 41 is controlled within a predetermined range after baking, thus achieving the purpose of auxiliary shaping.

[0057] It should be noted that the controlled physical changes and dimensional adjustments of the injection molded part during the baking process are achieved through the coordinated operation of three elements: the fixed clamping of the second part 42 providing a reference, the suspended setting of the first part 41 providing space for physical changes, and the adjustable shaping column 3 providing excessive deformation limits. The suspended setting of the adapter groove 14 is the structural basis for the space for physical changes, and the shaping column 3 is the adjusting element for controlling the amount of deformation; both are indispensable.

[0058] In the second embodiment, the limiting and shaping of workpiece 4 are set in the above structure. In the specific use of the fixture, the ordinary fixture lacks the positioning for the fastening of the upper plate structure 2 and the lower plate structure 1, which is not convenient for the fastening and transfer of the two. Therefore, it is also necessary to set the connection relationship between the upper plate structure 2 and the lower plate structure 1.

[0059] See Figure 6 Two combined cover handles 23 are symmetrically arranged on the top of the cover plate 22, and the two combined cover handles 23 are fixedly connected to the cover plate 22 by bolts. When fastening the lower plate structure 1 and the upper plate structure 2, the operator can hold the two combined cover handles 23 to lift the upper plate structure 2 as a whole and accurately place it on top of the lower plate structure 1 to achieve a smooth fastening.

[0060] See Figure 6 and Figure 7A number of fixing posts 24 are provided through the top of the cover plate 22. The fixing posts 24 are fixing bolts. When the lower plate structure 1 and the upper plate structure 2 are fastened together, the fixing posts 24 are provided through the cover plate 22, the limiting plate 21 and the plate body 11 in sequence. By tightening the fixing posts 24, the cover plate 22, the limiting plate 21 and the plate body 11 can be locked together as one, so that the upper plate structure 2 and the lower plate structure 1 can be reliably fixedly connected, so that the upper plate structure 2 will not separate from the lower plate structure 1 due to thermal expansion or external force during the baking process. Specifically, since the limiting block 13 is integrally formed with the plate body 11, the plate body 11 has fixing holes at the positions of the fixing posts 24. The fixing holes can be opened on the main body 131 of the limiting block 13 corresponding to the fixing posts 24. When the lower plate structure 1 and the upper plate structure 2 are fastened together, the fixing posts 24 are inserted into the fixing holes provided through the main body 131 and fixed by twisting.

[0061] See Figure 8 and Figure 9 A plurality of connecting posts 25 are provided between the limiting plate 21 and the cover plate 22. The connecting posts 25 are arranged sequentially through the bottom of the limiting plate 21 and the cover plate 22. The connecting posts 25 are countersunk bolts. The countersunk structure ensures that the head of the connecting post 25 does not protrude from the bottom surface of the limiting plate 21, thus avoiding interference with the workpiece 4 during fastening. The connecting posts 25 are used to fix the limiting plate 21 and the cover plate 22 into a whole, forming the upper plate structure 2.

[0062] See Figure 8 and Figure 9 Several connecting posts 26 are also provided through the top of the limiting plate 21. The top of the connecting post 26 is flush with the top of the adjusting hole 221, and the end of the connecting post 26 is provided through the bottom of the limiting plate 21. The end of the connecting post 26 is set with a round head structure. When the lower plate structure 1 and the upper plate structure 2 are fastened together, the round head end of the connecting post 26 first inserts into the positioning hole on the plate body 11, which plays a guiding and positioning role, so that the upper plate structure 2 is accurately aligned with the lower plate structure 1 in the horizontal direction. Specifically, since the limiting block 13 and the plate body 11 are integrally formed, the positioning hole can be opened on the main body 131 of the limiting block 13 corresponding to the connecting post 26. When the lower plate structure 1 and the upper plate structure 2 are fastened together, the round head end of the connecting post 26 first inserts into the positioning hole provided through the main body 131. It should be noted that the fixing hole and the positioning hole are respectively set for the fixing post 24 and the connecting post 26, and there is no interference between them.

[0063] The fixing holes and positioning holes are integrated into the main body 131 of the limiting block 13. Utilizing the integral molding structure of the limiting block 13 and the plate 11, the guiding and locking functions can be integrated without requiring additional space, increasing the density of the workstation layout. Mechanically, it shortens the locking force transmission path, enhancing the overall rigidity and resistance to thermal deformation after fastening. In manufacturing, the holes are directly machined using the outer contour of the limiting block 13 as a reference, reducing the cumulative error caused by reference conversion. Furthermore, the fixing and guiding functions are independently set and do not interfere with each other, ensuring reliability and durability during repeated use.

[0064] See Figure 2 After the lower plate structure 1 and the upper plate structure 2 are fastened together, they need to be transferred to the oven together. Therefore, a transfer component needs to be further added to the above structure. Specifically, two transfer handles 12 are fixedly connected to both ends of the plate body 11 by bolts. The two transfer handles 12 are symmetrically arranged at both ends of the plate body 11 for transferring the fixture composed of the lower plate structure 1 and the upper plate structure 2. After the baking process is completed, the operator can use a clamping tool to hold the transfer handles 12 and remove the entire fixture from the oven.

[0065] Example 3: The present invention also provides a shaping method for an auxiliary shaping fixture for injection molded parts, using the aforementioned auxiliary shaping fixture for injection molded parts. The method includes the following steps: S1. Obtain warpage data of workpiece 4. Use a warpage measuring device to measure each workpiece 4, obtain the warpage data of the first part 41 of each workpiece 4, and record the deformation data of each workpiece 4.

[0066] S2. Place the workpiece 4 on the lower plate structure 1. After measurement, place the workpiece 4 sequentially on the plate 11, so that each workpiece 4 is fitted onto the outside of the corresponding limiting block 13. The limiting block 13 radially positions the workpiece 4. The bottom of the second part 42 contacts the top of the plate 11 to obtain support during subsequent baking. The first part 41 is suspended above the adapter groove 14, which provides space for the physical changes of the first part 41 during subsequent baking.

[0067] S3. Adjust the position and height of the shaping column 3 based on the warp data, fasten the lower plate structure 1 and the upper plate structure 2, and finely adjust the position of the shaping column 3. Fix the lower plate structure 1 and the upper plate structure 2 with bolts. According to the warp data measured in S1, adjust the extension length of the ejector pin by rotating the headless screw of each shaping column 3, so that a predetermined compensation gap is formed between the bottom of the ejector pin and the top of the first part 41. This gap determines the maximum allowable deformation of the first part 41 during the baking process. The specific adjustment method is as follows: First, before fastening the upper plate structure 2, pre-screw the ejector pin to a pre-adjusted position close to the target height; then fasten the upper plate structure 2 onto the lower plate structure 1, so that the positioning part 212 presses against the second part 42, but do not lock the fixing column 24 yet; in the fastened position, perform final adjustment by turning the headless screw, so that the actual gap matches the reverse compensation value calculated based on the warp data; finally, lock the fixing column 24 to fix the cover plate 22, the limiting plate 21 and the plate body 11 into one piece. In this state, the second part 42 is clamped and fixed, while the first part 41 is suspended and limited by the ejector pin.

[0068] S4. Place the lower plate structure 1 and the upper plate structure 2 into the oven. Place the fixed fixture as a whole into the oven to bake the workpiece 4. Specifically, maintain the temperature at a predetermined time to allow the workpiece 4 to undergo a controlled physical transformation process. During this process, the shaping column 3 assists in shaping the workpiece 4. After baking, remove the fixture using a clamping tool, disassemble the upper plate structure 2, and remove the processed workpiece 4. Allow the workpiece 4 to cool naturally to complete the processing of the workpiece 4.

[0069] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. A shaping fixture for injection molded parts, characterized in that: Includes a lower plate structure (1) and an upper plate structure (2) for adaptive installation; The lower plate structure (1) includes a plate body (11), and two transfer handles (12) are fixedly connected to both ends of the plate body (11) by bolts. The two transfer handles (12) are used to transfer the jig composed of the lower plate structure (1) and the upper plate structure (2). Several limiting blocks (13) are arranged in a matrix on the plate body (11), and a set of adapter slots (14) are opened on the plate body (11) corresponding to each set of limiting blocks (13). The workpiece (4) includes a first part (41) and a second part (42) integrally formed with the first part (41). The workpiece (4) is placed on the outside of the limiting block (13). The adapter groove (14) is recessed and suspended between the adapter groove (14) and the first part (41). A shaping column (3) is provided above the first part (41) to assist in shaping. The upper plate structure (2) includes a limiting plate (21) and a cover plate (22) disposed on the top of the limiting plate (21). The limiting plate (21) has a through-hole (211); the cover plate (22) has an adjustment hole (221); the adjustment hole (221) and the adapter hole (211) are connected; the shaping column (3) is arranged to pass through the adjustment hole (221) and the adapter hole (211) in sequence; the bottom of the shaping column (3) is in contact with the top of the first part (41); The bottom of the limiting plate (21) is provided with a set of positioning members (212) corresponding to each set of limiting blocks (13). The positioning members (212) are used to limit the top of the second part (42) after the lower plate structure (1) and the upper plate structure (2) are fastened together.

2. The auxiliary shaping fixture for injection molded parts according to claim 1, characterized in that: The limiting block (13) and the plate (11) are integrally formed. When the workpiece (4) is placed outside the limiting block (13), the limiting block (13) is used to position the workpiece (4). After the lower plate structure (1) and the upper plate structure (2) are fastened together, the limiting block (13) radially limits the workpiece (4).

3. The auxiliary shaping fixture for injection molded parts according to claim 2, characterized in that: The limiting block (13) includes a main body (131), and a first limiting part (132), a second limiting part (133), a third limiting part (134), a fourth limiting part (135) and a fifth limiting part (136) are integrally formed around the outer side of the main body (131). Each connection point between the first limiting part (132), the second limiting part (133), the third limiting part (134), the fourth limiting part (135) and the fifth limiting part (136) is provided with an arc transition structure. The adapter groove (14) is configured in an L-shape and surrounds the third limiting part (134), the fourth limiting part (135) and the fifth limiting part (136).

4. The auxiliary shaping fixture for injection molded parts according to claim 1, characterized in that: The positioning component (212) includes a first positioning block (2121), a second positioning block (2122), and a third positioning block (2123) arranged in sequence. The first positioning block (2121), the second positioning block (2122), and the third positioning block (2123) are all set as rectangular structures. The first positioning block (2121), the second positioning block (2122), and the third positioning block (2123) are respectively used to limit the triangular position at the top of the second part (42) when the lower plate structure (1) and the upper plate structure (2) are engaged.

5. The auxiliary shaping fixture for injection molded parts according to claim 4, characterized in that: The top of the cover plate (22) is symmetrically provided with two sets of cover handles (23), and the two sets of cover handles (23) are fixedly connected to the cover plate (22) by bolts.

6. The auxiliary shaping fixture for injection molded parts according to claim 5, characterized in that: The top of the cover plate (22) is provided with several fixing posts (24), which are fixing bolts. When the lower plate structure (1) and the upper plate structure (2) are fastened together, the fixing posts (24) are provided to pass through the cover plate (22), the limiting plate (21) and the plate body (11) in sequence. The fixing posts (24) are used to limit the cover plate (22), the limiting plate (21) and the plate body (11).

7. The auxiliary shaping fixture for injection molded parts according to claim 6, characterized in that: A plurality of connecting posts (25) are provided between the limiting plate (21) and the cover plate (22). The connecting posts (25) are arranged from the bottom of the limiting plate (21) through the limiting plate (21) and the cover plate (22) in sequence. The connecting posts (25) are countersunk bolts. The connecting posts (25) are used to fix the limiting plate (21) and the cover plate (22).

8. The auxiliary shaping fixture for injection molded parts according to claim 7, characterized in that: The top of the limiting plate (21) is also provided with several connecting posts (26). The top of the connecting posts (26) is flush with the top of the adjustment hole (221). The end of the connecting posts (26) is provided through the bottom of the limiting plate (21). The end of the connecting posts (26) is set as a round head structure. When the lower plate structure (1) and the upper plate structure (2) are fastened together, the end of the connecting posts (26) passes through the positioning hole on the plate body (11).

9. The auxiliary shaping fixture for injection molded parts according to claim 8, characterized in that: The shaping column (3) includes a ejector pin and a headless screw set on the top of the ejector pin. The headless screw is set inside the adjustment hole (221). After the warp data of the workpiece (4) is obtained, the position between the ejector pin and the workpiece (4) is adjusted by the headless screw based on the warp data so as to adapt to the auxiliary shaping of the workpiece (4) by the shaping column (3) in the subsequent process.

10. A shaping method using an auxiliary shaping fixture for injection molded parts, comprising using the auxiliary shaping fixture for injection molded parts as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. Obtain the warping data of each workpiece (4); S2. Place the workpieces (4) on the plate (11) in sequence, so that each workpiece (4) is fitted on the outside of the corresponding limiting block (13); S3. Adjust the position and height of each shaping column (3) based on the warping data, fasten the lower plate structure (1) and the upper plate structure (2), and fix the lower plate structure (1) and the upper plate structure (2) with bolts. S4. Place the fixed lower plate structure (1) and upper plate structure (2) into the oven to bake the workpiece (4). After baking, remove the lower plate structure (1) and upper plate structure (2) as a whole, disassemble the upper plate structure (2), remove the workpiece (4), and let the workpiece (4) cool naturally.

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