Free-form surface edge ink coating jig

Abstract

The utility model relates to 3D free-form surface product processing, and provides a free-form surface edge ink coating jig which comprises a jig body, at least one side face of the jig body forms an inclined face, the inclined face is a fixing face, a fixing groove is formed in the fixing face, and the upper portion of the fixing groove forms an opening structure. A gap can be formed between at least one edge of the free-form surface product adsorbed on the fixed surface and the upper edge of the fixed groove, so that the edge of the free-form surface product can be printed and ink-coated after the free-form surface product is fixed, and the precision and efficiency of edge ink coating are improved.

Description

Technical Field

[0001] The present disclosure relates to the processing of 3D free-form surface products, and particularly to an inking fixture for the edge of a free-form surface. Background Art

[0002] The HUD mirror is the core component of the automotive head-up display. The light leakage at its vertical position will rotate with the angle, and bright lines appear on the edge, causing light pollution, which has a great impact on the imaging effect of the head-up display and seriously affects the overall use effect of the product.

[0003] In order to reduce the interference of edge stray light, it is necessary to absorb and block the light leakage part at the edge of the product. Currently, for the inking process of the edge of a free-form surface product, the following two methods are usually adopted: First, manual operation with a rubber roller can be used for the process. During the process, the free-form surface product is fixed manually. When performing the inking operation, the free-form surface product is prone to tilt, resulting in problems such as edge ink overflow or uneven edge inking, and the manual inking efficiency is low. Second, relevant fixtures can also be used to fix the free-form surface product and then perform the inking operation. However, in the design process of the existing fixtures, the consideration of the chamfer structure is lacking, and unnecessary compression and scratching occur on the chamfer edge during the processing, resulting in damage and scratches, increasing the scrap rate and restricting the production efficiency and cost control. Summary of the Utility Model

[0004] The basic technical problem to be solved by the present disclosure is that it is difficult to fix a free-form surface product to perform printing and inking operations on the edge of the product. This inking fixture for the edge of a free-form surface can effectively fix the free-form surface product to improve the inking processing effect and efficiency of the edge of the free-form surface product.

[0005] To solve the above technical problem, the present disclosure provides an inking fixture for the edge of a free-form surface, including a fixture body. At least one side surface of the fixture body is formed as an inclined surface, and this inclined surface is a fixing surface. A fixing groove is opened on the fixing surface, and the upper part of the fixing groove is formed as an open structure so that there is a gap between at least one edge of the free-form surface product adsorbed on the fixing surface and the upper edge of the fixing groove.

[0006] In some embodiments, a plurality of through holes for connecting a vacuum negative pressure device are opened at the bottom of the fixing groove. The through holes penetrate the fixture body, and one end of the through hole far from the bottom of the fixing groove is connected to the vacuum negative pressure device; a cavity is provided at the bottom of the fixing groove, and the free-form surface product is adapted to be abutted against the outer edge of the cavity.

[0007] In some embodiments, the number of fixing grooves is set to one, and the fixing groove is arranged in the central area of the fixing surface; or the number of fixing grooves is set to two, and the two fixing grooves are symmetrically arranged with respect to the center line in the length direction of the fixing surface; or the number of fixing grooves is set to at least three, and the distance between adjacent two fixing grooves is equal.

[0008] In some embodiments, the opening diameter of one end of the through hole near the fixing groove is larger than that of the other end.

[0009] In some embodiments, the lower part of the fixing groove is formed as an open structure so that there is a gap between at least one edge of the free-form surface product adsorbed on the fixing surface and the lower edge of the fixing groove.

[0010] In some embodiments, the cavity is formed with a U-shaped recessed structure, and each through hole is arranged in the area of the bottom of the fixing groove that is not covered by the cavity.

[0011] In some embodiments, the side surface of the cavity is formed as a plane and a curved surface that are inclined inward from top to bottom.

[0012] In some embodiments, a positioning platform is further formed in the fixing groove. The edge of the positioning platform can abut against the free-form surface product, and the surface of the positioning platform is higher than the surface of the cavity.

[0013] In some embodiments, elastic buffer layers are provided on the edge of the positioning platform and the outer edge of the fixing groove.

[0014] In some embodiments, an included angle is formed between the fixing surface and the bottom of the fixture body, and the included angle is 35 - 55 degrees.

[0015] In some embodiments, an embedding groove is further provided at the bottom of the fixture body. The embedding groove is used to connect a vacuum negative pressure device, and one end of the through hole far from the cavity is located in the embedding groove.

[0016] In some embodiments, an auxiliary fixture is further included. One side surface of the auxiliary fixture is formed as a fitting surface, and the fitting surface is adapted to fit with the fixing surface.

[0017] Through the above technical solutions, a free-form surface edge ink-jetting fixture provided by the present disclosure includes a fixture body. The free-form surface product is embedded in the fixing groove of the inclined fixing surface. The vacuum negative pressure device can generate negative pressure through a plurality of through holes to adsorb the free-form surface product, and the positioning platform and the cavity support the free-form surface product, so as to position the free-form surface product and reduce the possibility of the free-form surface product being scratched. During this process, the free-form surface product is firmly fixed in the fixing groove, and one or two edges of the free-form surface product can protrude from the fixing groove. The auxiliary fixture further clamps the free-form surface product, and then the edges of the free-form surface product can be printed and inked. Compared with manual ink-jetting, not only the situation that the free-form surface product is not firmly fixed, resulting in edge ink overflow or uneven edge ink-jetting, is reduced, but also the ink-jetting processing efficiency is improved. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 is a schematic structural diagram of a free-form surface edge inking fixture disclosed in an embodiment of the present disclosure;

[0020] Figure 2 is a front view of a free-form surface edge inking fixture disclosed in an embodiment of the present disclosure;

[0021] Figure 3 is a bottom view of a free-form surface edge inking fixture disclosed in an embodiment of the present disclosure;

[0022] Figure 4 is a schematic structural diagram of an auxiliary fixture in a free-form surface edge inking fixture disclosed in an embodiment of the present disclosure;

[0023] Figure 5 is a schematic diagram of the usage situation of the fixture body and the auxiliary fixture in a free-form surface edge inking fixture disclosed in an embodiment of the present disclosure.

[0024] Explanation of reference numerals:

[0025] 1. Fixture body; 2. Fixed surface; 3. Fixed groove; 4. Through hole; 5. Cavity; 6. Positioning platform; 7. Embedding groove; 8. Auxiliary fixture; 9. Fitting surface. Detailed implementation manners

[0026] The following will further describe in detail the implementation manners of the present disclosure in conjunction with the accompanying drawings and embodiments. The detailed description and the accompanying drawings of the following embodiments are used to exemplarily illustrate the principle of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms, not limited to the specific embodiments disclosed herein, but including all technical solutions falling within the scope of the claims.

[0027] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and fully express the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of the components and steps, the components of the materials, the numerical expressions and the numerical values described in these embodiments should be interpreted as merely exemplary, rather than as limitations.

[0028] It should be noted that in the description of the present disclosure, unless otherwise specified, "a plurality of" means greater than or equal to two; the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] In addition, the "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "including" or "comprising" mean that the elements before the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements.

[0030] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0031] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as those defined in a general dictionary, should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0032] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the specification.

[0033] The present disclosure provides a free-form surface edge inking fixture, see Figures 1 to 3 , including:

[0034] A fixture body 1, at least one side surface of the fixture body 1 is formed as an inclined surface, and this inclined surface is a fixed surface 2. A fixed groove 3 is formed on the fixed surface 2. The upper part of the fixed groove 3 is formed as an open structure so that there is a gap between at least one edge of the free-form surface product adsorbed on the fixed surface 2 and the upper edge of the fixed groove 3.

[0035] In the present disclosure, the actual contour coordinates of the free-form surface product to be inked are first collected through point position calculation to obtain the actual contour coordinates of the free-form surface product. Subsequently, the fixture body 1 is designed and manufactured by a profiling process, so that the fixture body 1 can match the radian and shape of the free-form surface product, and thus the free-form surface product with a curved surface can be fixed. When the fixture body 1 is placed horizontally, the angle between one side surface of the fixture body 1 and the horizontal plane is an acute angle, that is, one surface of the fixture body 1 is an inclined surface, and this inclined surface is the fixing surface 2. A fixing groove 3 for the free-form surface product to be embedded is formed on the fixing surface 2. The size of the fixing groove 3 matches that of the free-form surface product to be inked, which enables the free-form surface product to be stably embedded in the fixing groove 3. That is, the fixture body 1 can stably and continuously fix the free-form surface product, and using the inclined surface as the fixing surface 2 can reduce the situation of fixing failure caused by the free-form surface product coming out of the fixing groove 3.

[0036] The upper part of the fixing groove 3 is an open structure, that is, the fixing groove 3 extends along the height direction of the fixture body 1 and penetrates through the upper part of the fixture body 1. Specifically, when the free-form surface product is embedded in the fixing groove 3, the upper edge of the free-form surface product does not fit against the groove wall of the fixing groove 3, and the upper edge of the free-form surface product is flush with or higher than the upper bottom surface of the fixture body 1, that is, the upper edge of the free-form surface product protrudes from the fixing groove 3. Therefore, after the free-form surface product is embedded in the fixing groove 3, the upper edge of the free-form surface product can be printed and inked. Compared with manual edge processing using a rubber roller, it can not only improve the ink application accuracy, reduce the possibility of edge ink overflow and uneven edge ink application, but also improve the ink application efficiency.

[0037] In some embodiments, a plurality of through holes 4 for connecting a vacuum negative pressure device are formed at the bottom of the fixing groove 3. The through holes 4 penetrate through the fixture body 1, and one end of the through holes 4 far away from the bottom of the fixing groove 3 is connected to the vacuum negative pressure device.

[0038] In a specific embodiment of the present disclosure, a cavity 5 is provided at the bottom of the fixed groove 3, and the free-form surface product is suitable for being attached to the outer edge of the cavity 5. After the free-form surface product is embedded in the fixed groove 3, the vacuum negative pressure device is started, and the vacuum negative pressure device extracts the air between the bottom of the fixed groove 3 and the free-form surface product through the through hole 4, thereby vacuum adsorbing the free-form surface product, which can further increase the fixing stability of the free-form surface edge inking jig on the free-form surface product. When the vacuum negative pressure equipment is performing vacuum adsorption on the free-form surface product, the free-form surface product is attached to the outer edge of the cavity 5. On the one hand, the cavity 5 can support the free-form surface product to reduce the situation where the vacuum adsorption force of the vacuum negative pressure equipment is too large, causing the middle part of the free-form surface product to bend toward the bottom of the fixed groove 3, thereby reducing the possibility that the free-form surface edge inking jig will not be able to fix the free-form surface product firmly. On the other hand, when the inking is completed and the vacuum negative pressure equipment is turned off, the cavity 5 abuts between the free-form surface product and the bottom of the fixed groove 3, so that air can flow into the space between the free-form surface product and the bottom of the fixed groove 3 through the through hole 4, which helps to reduce the situation where the free-form surface product is difficult to separate from the fixed groove 3.

[0039] In some embodiments, the number of the fixing groove 3 is set to one, and the fixing groove 3 is set in the central area of ​​the inclined fixing surface 2, and a plurality of through holes 4 are provided at the bottom of the fixing groove 3.

[0040] Optionally, the number of the fixing grooves 3 is set to two, and the two fixing grooves 3 are symmetrically arranged with respect to the center line in the length direction of the inclined fixing surface 2, and a plurality of through holes 4 are provided at the bottom of each fixing groove 3.

[0041] Optionally, the number of the fixing grooves 3 is set to at least three, the distance between two adjacent fixing grooves 3 is equal, and a plurality of through holes 4 are provided at the bottom of each fixing groove 3 .

[0042] In a specific embodiment of the present disclosure, the number of fixed grooves 3 can be flexibly set according to actual needs, whether it is a single layout located in the central area of ​​the inclined fixed surface 2, or two fixed grooves 3 are symmetrically arranged on both sides of the center line of the inclined fixed surface 2 in the length direction, or even a larger number of fixed grooves 3 are configured with equal distances. All of them are intended to achieve the best airflow distribution and adsorption balance, so that it not only adapts to free-form surface products of different sizes and shapes, but also optimizes the utilization efficiency of the vacuum negative pressure equipment, so that the adsorption force of the vacuum negative pressure equipment on the free-form surface products is balanced and consistent.

[0043] In some embodiments, the opening diameter of one end of the through hole 4 close to the fixing groove 3 is larger than the diameter of the other end. The larger suction end diameter can more easily capture and guide the surrounding air into the through hole 4, which helps to quickly adsorb the free-form surface product.

[0044] In some embodiments, the lower part of the fixing groove 3 is formed as an open structure, so that there is a gap between at least one edge of the free-form surface product adsorbed on the fixing surface 2 and the lower edge of the fixing groove 3, that is, both the upper and lower parts of the fixing groove 3 penetrate through the jig body 1. The free-form surface product is fixed in the fixing groove 3 under the adsorption of the vacuum negative pressure device, which makes the upper edge of the free-form surface product protrude from the fixing groove 3, and the lower edge also protrudes from the fixing groove 3. Therefore, after the free-form surface product is embedded in the fixing groove 3 and vacuum adsorbed by the vacuum negative pressure device, the upper edge and the lower edge of the free-form surface product can be printed and inked, which can further improve the ink application efficiency.

[0045] In some embodiments, the cavity 5 is formed with a U-shaped recessed structure, and each through hole 4 is arranged in the area of the bottom of the fixing groove 3 that is not covered by the cavity 5. When the vacuum negative pressure device vacuum adsorbs and fixes the free-form surface product, the middle part of the free-form surface product bends towards the bottom of the fixing groove 3. The U-shaped recessed structure enables the cavity 5 to fit with the free-form surface product over a larger area, which can not only improve the support stability of the cavity 5 for the free-form surface product, but also reduce the situation that the free-form surface product is scratched due to too small contact area between the free-form surface product and the cavity 5.

[0046] In some embodiments, the side surface of the cavity 5 is formed as a plane and a curved surface that incline inwards from top to bottom. When the vacuum negative pressure device vacuum adsorbs and fixes the free-form surface product, it can guide the air flow more evenly and efficiently, improving the adsorption effect and stability.

[0047] In some embodiments, a positioning platform 6 is further formed in the fixing groove 3. The edge of the positioning platform 6 can abut against the free-form surface product, and the surface of the positioning platform 6 is higher than the surface of the cavity 5. At least one positioning platform 6 is formed in the fixing groove 3. The edge of the positioning platform 6 is precisely designed to abut against the edge or specific part of the free-form surface product to provide multi-point abutment for the free-form surface product. The multi-point support makes the fixing of the free-form surface product by the free-form surface edge inking jig more stable, and can reduce the possibility that the edge of the free-form surface product bends towards the bottom of the fixing groove 3, so as to ensure the positioning accuracy of the free-form surface edge inking jig for the free-form surface product.

[0048] In some embodiments, elastic buffer layers are provided on the edge of the positioning platform 6 and the outer edge of the fixing groove 3. The elastic buffer structure provides a soft contact interface at the edges of the positioning platform 6 and the fixing groove 3, effectively alleviating the impact and friction generated by the direct contact between the free-form surface product and the hard material during installation, fixing and operation, significantly reducing the risk of breakage and scratching. At the same time, the elastic buffer structure can make adaptive adjustments according to the contour of the free-form surface product, ensuring the close fit between the positioning platform 6 and the edge of the fixing groove 3 and the free-form surface product, enhancing the sealing performance, and further improving the efficiency and stability of vacuum adsorption.

[0049] In some embodiments, an included angle is formed between the fixing surface 2 and the bottom of the jig body 1, and the included angle is 35 - 55 degrees. This angle range can make the fixing surface 2 fit the free-form surface product better. Especially when fixing a free-form surface product with a relatively large or irregular curved surface, it can improve the efficiency and stability of vacuum adsorption and fixation. The inclined design helps the air flow to be evenly distributed between the bottom of the fixing groove 3 and the free-form surface product, reducing the air leakage points, thereby enhancing the adsorption force. In addition, the included angle of 35 - 55 degrees is a range, and the most suitable angle can be adjusted according to the specific requirements of different application scenarios to ensure the fixing stability of the free-form surface edge ink-jetting jig for the free-form surface product.

[0050] In some embodiments, an embedding groove 7 is further provided at the bottom of the jig body 1. The embedding groove 7 is used to connect the vacuum negative pressure device. One end of the through hole 4 far away from the cavity 5 is located in the embedding groove 7, which is more directly connected to the vacuum negative pressure device, shortening the air flow path, reducing the air flow loss, improving the adsorption efficiency, and also helping to better control and manage the direction and speed of the air flow. In addition, the embedding groove 7 helps to isolate the noise generated when the vacuum negative pressure device works. Especially when the embedding groove 7 is wrapped or filled with sound insulation materials, the noise can be further reduced. At the same time, the jig body 1 is secretly connected to the vacuum negative pressure device, reducing the exposure of external pipelines, making the tooling equipment cleaner and more compact.

[0051] In some embodiments, an auxiliary fixture 8 is further included. One side surface of the auxiliary fixture 8 is formed as a fitting surface 9, and the fitting surface 9 is adapted to fit with the fixing surface 2. When the fitting surface 9 fits with the fixing surface 2, the auxiliary fixture 8 and the jig body 1 jointly clamp the free-form surface product, enabling better fixation and positioning of the free-form surface product. The jig body 1 and the auxiliary fixture 8 can also protect the free-form surface product, and at the same time help to reduce the possibility of edge ink overflow. An elastic buffer layer is also provided on the fitting surface 9. The elastic buffer layer provides a soft contact interface, effectively alleviating the impact and friction generated when the free-form surface product comes into direct contact with hard materials during installation, fixation, and operation, significantly reducing the risk of breakage and scratching. At the same time, the elastic buffer layer can make adaptive adjustments according to the contour of the free-form surface product, ensuring a tight fit between the fitting surface 9, the fixing surface 2, and the free-form surface product, and enhancing the fixing stability.

[0052] In some embodiments, to better understand the technical solutions of the present disclosure, the following is described in combination with relatively preferred technical features.

[0053] The present disclosure provides a free-form surface edge inking fixture, including a fixture body 1. At least one side surface of the fixture body 1 forms an inclined surface as a fixing surface 2 to fit a free-form surface product. There is an included angle between the fixing surface 2 and the bottom of the fixture body 1, and the included angle is 35 - 55 degrees. A fixing groove 3 is formed on the fixing surface 2. The number of the fixing grooves 3 is set to one, and the fixing groove 3 is located in the central area of the fixing surface 2. Both the upper part and the lower part of the fixing groove 3 are open structures. A plurality of through holes 4 are formed at the bottom of the fixing groove 3. The through holes 4 penetrate through the fixture body 1 and extend to the bottom of the fixture body 1. The opening diameter of one end of the through hole 4 close to the fixing groove 3 is larger than that of the other end. An embedding groove 7 is further formed at the bottom of the fixture body 1. The embedding groove 7 is used to connect a vacuum negative pressure device. One end of the through hole 4 far from the fixing groove 3 is located in the embedding groove 7. A positioning platform 6 is formed in the fixing groove 3. The edge of the positioning platform 6 can abut against the free-form surface product. Elastic buffer structures are provided on the edge of the positioning platform 6 and the upper edge of the fixing groove 3. A cavity 5 is further formed in the fixing groove 3. The cavity 5 forms a U-shaped recessed structure. Each through hole 4 is arranged in the area of the bottom of the fixing groove 3 not covered by the cavity 5. The side of the cavity 5 forms a plane and a curved surface that incline inwards from top to bottom. An auxiliary fixture 8 is further included. One side surface of the auxiliary fixture 8 forms a fitting surface 9, and the fitting surface 9 is suitable for fitting with the fixing surface 2.

[0054] In summary, the free-form surface edge inking fixture of the present disclosure has the following advantages: The fixing surface 2 matches the radian of the free-form surface product. The free-form surface product can be embedded in the fixing groove 3. After the vacuum negative pressure device starts to work, the free-form surface product is firmly adsorbed and fixed in the fixing groove 3. The cavity 5 and the positioning platform 6 form a support for the free-form surface product, protecting the free-form surface product while firmly fixing it. The auxiliary fixture 8 further clamps the free-form surface product. The upper edge and the lower edge of the free-form surface product protrude from the fixing groove 3, so that the edges of the free-form surface product can be printed and inked, which not only improves the accuracy of inking the edges of the free-form surface product, but also improves the efficiency of inking the edges of the free-form surface product.

[0055] So far, the embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Those skilled in the art can clearly understand how to implement the technical solutions disclosed here based on the above description.

[0056] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or equivalent substitutions can be made for some technical features without departing from the scope and spirit of the present disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A free-form surface edge inking fixture, characterized in that It includes a jig body (1), at least one side surface of the jig body (1) is formed as an inclined surface, which is a fixing surface (2), a fixing groove (3) is formed on the fixing surface (2), and the upper part of the fixing groove (3) is formed as an open structure so that there is a gap between at least one edge of the free-form surface product adsorbed on the fixing surface (2) and the upper edge of the fixing groove (3).

2. The free-form surface edge inking fixture according to claim 1, wherein A number of through holes (4) for connecting a vacuum negative pressure device are formed at the bottom of the fixing groove (3), the through holes (4) penetrate through the jig body (1), and one end of the through hole (4) far from the bottom of the fixing groove (3) is connected to the vacuum negative pressure device; A cavity (5) is provided at the bottom of the fixing groove (3), and the free-form surface product is adapted to be abutted against the outer edge of the cavity (5).

3. The free-form surface edge inking fixture according to claim 2, characterized in that, The number of the fixing grooves (3) is set to one, and the fixing groove (3) is arranged in the central area of the fixing surface (2); or The number of the fixing grooves (3) is set to two, and the two fixing grooves (3) are symmetrically arranged with respect to the center line in the length direction of the fixing surface (2); or The number of the fixing grooves (3) is set to at least three, and the distance between adjacent two fixing grooves (3) is equal.

4. The free-form surface edge inking fixture according to claim 3, characterized in that, The opening diameter of one end of the through hole (4) close to the fixing groove (3) is larger than that of the other end.

5. The free-form surface edge inking fixture according to claim 2, characterized in that The lower part of the fixing groove (3) is formed as an open structure so that there is a gap between at least one edge of the free-form surface product adsorbed on the fixing surface and the lower edge of the fixing groove (3).

6. The free-form surface edge inking fixture according to claim 4, characterized in that, The cavity (5) is formed with a U-shaped recessed structure, and each of the through holes (4) is arranged in the area of the bottom of the fixing groove (3) not covered by the cavity (5).

7. The free-form surface edge inking fixture according to claim 6, characterized in that, The side surface of the cavity (5) is formed as a plane and a curved surface that incline inward from top to bottom.

8. The free-form surface edge inking fixture according to claim 3, characterized in that, A positioning platform (6) is further formed in the fixing groove (3), the edge of the positioning platform (6) can abut against the free-form surface product, and the surface of the positioning platform (6) is higher than the surface of the cavity (5).

9. The free-form surface edge inking fixture according to claim 8, wherein, Elastic buffer layers are provided on the edge of the positioning platform (6) and the outer edge of the fixing groove (3).

10. The free-form surface edge inking fixture according to any one of claims 1 to 9, characterized in that, An included angle is formed between the fixing surface (2) and the bottom of the jig body (1), and the included angle is 35 - 55 degrees.

11. The free-form surface edge inking fixture according to any one of claims 2 to 9, characterized in that, An embedding groove (7) is further provided at the bottom of the jig body (1), the embedding groove (7) is used for connecting the vacuum negative pressure device, and one end of the through hole (4) far from the cavity (5) is located in the embedding groove (7).

12. The free-form surface edge inking fixture according to claim 1, wherein It further includes an auxiliary jig (8), one side surface of the auxiliary jig (8) is formed as a fitting surface (9), and the fitting surface (9) is adapted to be fitted with the fixing surface (2).

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