Mold repairing method of plastic mold
The mold notch is exposed through 3D scanning and grinding technology, and the repair is layer by layer using 3D printing and ultraviolet curing technology, which solves the problem of reduced precision of the mold due to wear, extends the mold life and reduces costs.
Patent Information
- Application Number
- CN202411545414.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-01-07
AI Technical Summary
During use, the injection molds are deformed, scratched or worn due to collisions, wear and other reasons, resulting in reduced mold accuracy and scrapping, increasing the injection molding cost.
The 3D scanning technology is used to confirm that the side walls on the mold are blocked by blocking the notch. The area of the notch opening is increased by polishing, so that the side walls are exposed. The 3D printing and ultraviolet curing technology are used to scan layer by layer with slice comparison, filling the defects to repair the mold.
Effectively repair the defects of the mold, extend the service life of the mold, and reduce resource waste and injection molding costs.
Smart Images
Figure CN119261027A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of mold technology, and in particular to a method for repairing a plastic mold. Background Art
[0002] Injection molds are consumable workpieces in the casting process. When the mold surface is deformed due to collision, scratched, or worn, the mold accuracy will be greatly reduced and scrapped, thereby increasing the injection molding cost. Summary of the invention
[0003] The present application provides a plastic mold repair method for facilitating the repair of the plastic mold.
[0004] The present application provides a method for repairing a plastic mold, the method comprising the following steps:
[0005] Grinding the damaged plastic mold to remove protrusions or burrs on the plastic mold;
[0006] Scanning the plastic mold and confirming all the gaps on the side walls of the mold that are blocked;
[0007] Polishing all the gaps whose side walls are blocked to increase the opening area of the gaps and make the side walls of the gaps exposed;
[0008] Acquire an unworn image of the plastic mold, and slice the unworn image according to a height of 3D printing;
[0009] The plastic mold is scanned layer by layer according to the slices, and the scanned image is compared with the corresponding slices, and whether there are defects is confirmed based on the comparison results; if there are defects, the defects are filled by 3D printing to the thickness of the corresponding slices, and the filled material is cured by ultraviolet rays.
[0010] In the above technical solution, the surface of the mold is processed in the early stage to remove burrs and protrusions, and then 3D scanning is performed to open the hidden gap on the back of the side wall on the outer surface of the mold, so as to facilitate subsequent 3D printing. During the printing process, the mold is sliced according to the unworn image, and the actual situation of the corresponding position of the current slice is obtained through real-time scanning, and 3D printing is performed according to the actual situation, which facilitates the repair of the mold.
[0011] In a specific implementation scheme, scanning the plastic mold and confirming all the gaps on the side walls of the mold that are blocked specifically includes:
[0012] Scanning the outer surface of the plastic mold by a 3D scanner to generate an outer surface image of the plastic mold;
[0013] All the gaps blocked by the side walls are confirmed based on the outer surface image scanned by the 3D scanner, and the positions of the gaps blocked by the side walls are confirmed.
[0014] In a specific possible implementation scheme, the step of confirming all the gaps blocked by the side walls and the positions of the gaps blocked by the side walls according to the outer surface image scanned by the 3D scanner is as follows:
[0015] Taking the placement surface of the plastic mold as a reference surface, constructing an XYZ reference coordinate system, wherein the reference surface is an XY plane;
[0016] Get the coordinates of any point of the outer surface image in the XYZ coordinate system, if any two points satisfy:
[0017] The coordinates of the first point are: X=a, Y=b, Z=c1; the coordinates of the second point are: X=a, Y=b, Z=c2, and the absolute value of c1-c2 is greater than 0, then the gaps corresponding to the first point and the second point are determined to be gaps blocked by the side wall; among them, a, b, c1, and c2 are all greater than 0.
[0018] In a specific possible implementation scheme, the step further includes performing a 3D scan on the plastic mold again after polishing all the gaps whose side walls are blocked, to confirm whether all the gaps on the plastic mold are gaps whose side walls are exposed;
[0019] If the 3D scanning result shows that there are still gaps blocked by the side wall, polishing is performed again until it is confirmed through 3D scanning that all the gaps are gaps exposed on the side wall.
[0020] In a specific possible implementation scheme, the 3D scanning is used to confirm that all the gaps are gaps exposed on the side walls; specifically:
[0021] Taking the placement surface of the plastic mold as a reference surface, constructing an XYZ reference coordinate system, wherein the reference surface is an XY plane;
[0022] If any two points of the outer surface image do not overlap in the vertical projection of the XY plane, it is confirmed that all the gaps are gaps with exposed side walls.
[0023] In a specific possible implementation scheme, the polishing of all the gaps whose side walls are blocked increases the opening area of the gaps and makes the side walls of the gaps exposed; specifically:
[0024] The blocked notch on the side wall is ground into a notch with a V-shaped cross section.
[0025] In a specific possible implementation scheme, the damaged plastic mold is polished to remove protrusions or burrs on the plastic mold; specifically:
[0026] The plastic mold is polished by sandpaper or a grinding wheel to remove protrusions or burrs on the plastic mold.
[0027] In a specific possible implementation scheme, the plastic mold is scanned layer by layer according to the slices, and the scanned image is compared with the corresponding slices, and whether there is a defect is confirmed according to the comparison result; if there is a defect, the defect is filled by 3D printing to the thickness of the corresponding slice, and the filled material is cured by ultraviolet light; specifically:
[0028] The outer surface of the plastic mold is scanned by a scanning component that moves synchronously with the print head of the 3D printer; and during the scanning process, the scanned defects are filled and cured synchronously.
[0029] In a specific possible implementation scheme, the method further includes: after each printing of the area corresponding to the slice, scanning the area corresponding to the slice again, and performing compensation printing on the defects of the filler after filling and curing.
[0030] In a specific embodiment, the method further comprises performing ultraviolet curing for a second time in an oxygen-free environment after repairing the plastic mold. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 A flow chart of a plastic mold repair method provided in an embodiment of the present application;
[0032] Figure 2 A schematic diagram of a damaged state of a plastic mold provided in an embodiment of the present application;
[0033] Figure 3 A schematic diagram of a plastic mold provided in an embodiment of the present application after burrs or protrusions are removed;
[0034] Figure 4 A schematic diagram of a first notch and a second notch of a plastic mold provided in an embodiment of the present application;
[0035] Figure 5 A schematic diagram of the structure of the plastic mold after the second notch is processed according to an embodiment of the present application;
[0036] Figure 6 A schematic diagram of the analysis of the plastic mold provided in the embodiment of the present application in repairing the first notch;
[0037] Figure 7 A schematic diagram of the plastic mold after repair provided in an embodiment of the present application. DETAILED DESCRIPTION
[0038] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.
[0039] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0040] To facilitate understanding of the plastic mold repair method provided in the embodiment of the present application, its application scenario is first described. The plastic mold repair method provided in the embodiment of the present application is used to repair the mold, especially in the repair process of a small plastic mold. Current small plastic molds are inevitably damaged during use, and are often directly discarded after the mold is damaged, resulting in a waste of resources. For this reason, the embodiment of the present application provides a plastic mold repair method to reduce the waste of resources. The following is a detailed description in conjunction with specific embodiments and drawings.
[0041] In the plastic mold repair method provided in the embodiment of the present application, the gap on the plastic mold is processed to repair the gap into a gap that can be directly repaired by 3D printing, and then the gap is repaired by 3D printing. The method provided in the embodiment of the present application is described in detail below with reference to specific drawings.
[0042] refer to Figure 1 As shown, Figure 1 The flowchart of the plastic mold repair method provided in the embodiment of the present application is shown in FIG. The plastic mold repair method provided in the embodiment of the present application mainly comprises the following steps:
[0043] Step 001: Grinding the damaged plastic mold 100 to remove protrusions or burrs on the plastic mold 100;
[0044] During the specific grinding, the plastic mold 100 can be ground with sandpaper or a grinding wheel to remove protrusions or burrs on the plastic mold 100. Figure 2 and Figure 3 As shown, Figure 2 FIG. 4 shows a schematic diagram of the surface of the plastic mold 100 before polishing. Figure 3FIG. 1 shows a schematic diagram of the surface of the plastic mold 100 after polishing. Figure 2 It can be seen that when the plastic mold 100 is damaged, some burrs or protrusions will appear on the surface of the plastic mold 100. For example, when the surface of the plastic mold 100 is scratched or bumped, some burrs or protrusions will appear on the surface of the plastic mold 100. When processing the surface of the plastic mold 100, the surface of the plastic mold 100 can be polished with sandpaper to grind away the burrs or protrusions on the surface of the plastic mold 100, so that only depressions (notches 220 or scratches formed by bumps) exist on the surface of the plastic mold 100.
[0045] Of course, in addition to the sandpaper in the above example, a grinding wheel can also be used for grinding, or other tools that can process the surface of the plastic mold 100 can be used for grinding, which is not specifically limited in the embodiments of the present application.
[0046] Step 002: Scan the plastic mold 100 and confirm all the gaps 220 on the side walls of the mold that are blocked;
[0047] During the specific scanning, the outer surface of the plastic mold 100 can be scanned by a 3D scanner, and an outer surface image 200 of the plastic mold 100 can be generated. For example, the surface of the plastic mold 100 can be scanned by a handheld 3D scanner. During the specific operation, the staff can perform a 360° scan around the surface of the plastic mold 100 without blind spots to obtain an outer surface image of the plastic mold 100, and the outer surface image can display the notch 220 on the surface of the plastic mold 100.
[0048] According to the classification of the notch 220, the notch 220 can be divided into a notch 220 with all side walls exposed and a notch 220 with side walls blocked. For the convenience of description, the two types of notches 220 are named as the first notch 221 and the second notch 222, wherein the first notch 221 is a notch 220 with all side walls exposed, and the second notch 222 is a notch 220 with side walls blocked. The side walls of the notch 220 are exposed or hidden as follows: when looking at the notch 220 in a direction perpendicular to the surface of the plastic mold 100, the notch 220 with all side walls visible is the first notch 221, and the notch 220 with part of the side walls blocked and cannot be seen is the second notch 222.
[0049] It should be understood that in the embodiment of the present application, when the side wall of a notch 220 is of an irregular shape, such as a portion of one side wall is exposed and another portion is hidden, the notch 220 is also considered as a second notch 222 .
[0050] like Figure 4 As shown, Figure 4 Two different types of notches 220 are shown in FIG. Figure 4 It can be seen intuitively that along Figure 3 Looking at the gap 220 from the straight line direction in the example, it can be clearly seen that all the side walls of the first gap 221 are exposed, while part of the side walls of the second gap 222 are blocked. This step is to cooperate with the subsequent 3D printing implementation steps to perform preliminary processing on the gap 220. Figure 4 As shown in , during 3D printing, the 3D printed material also falls in a straight line direction, and since the second gap 222 is blocked by the side wall, the 3D printed material cannot be filled from the opening to the area corresponding to the blocked side wall during printing, as shown in FIG. Figure 5 As shown in the dotted reference line, when the material is filled into the second gap 222, the area corresponding to the opening on one side of the dotted line can be directly filled with the material, while the area on the other side of the dotted line is blocked, resulting in the material being unable to be filled in, which will cause pores in the repaired plastic mold 100, affecting the strength of the repaired plastic mold 100.
[0051] After scanning the outer surface of the plastic mold 100, all the gaps 220 (second gaps 222) blocked by the sidewalls are confirmed based on the outer surface image 200 scanned by the 3D scanner, and the positions of the second gaps 222 are confirmed. That is, the three-dimensional coordinates of the outer surface of the plastic mold 100 can be constructed by the outer surface image 200 scanned by the 3D scanner, and the coordinates of the second gap 222 can be confirmed in the three-dimensional coordinate system, thereby confirming the position of the second gap 222.
[0052] Specifically, the placement surface of the plastic mold 100 is used as a reference surface to construct an XYZ reference coordinate system, wherein the reference surface is an XY plane, the X direction and the Y direction are both horizontal directions, and the Z direction is the height of the plastic mold 100.
[0053] Afterwards, the coordinates of any point of the outer surface image 200 in the XYZ coordinate system are obtained. If any two of the points satisfy: the first point coordinates: X=a, Y=b, Z=c1; the second point coordinates: X=a, Y=b, Z=c2, and the absolute value of c1-c2 is greater than 0, then the gap 220 corresponding to the first point and the second point is determined to be a gap 220 blocked by the side wall; wherein a, b, c1, and c2 are all greater than 0. For example, Figure 3 For example, in the X and Y directions, the positions of A1 and A2 are the same, but in the Z direction, there is a difference in height between A1 and A2, that is, there is a drop between the two points. The gap 220 at this position is considered to be the second gap 222. For the first gap 221, it is considered that there are no two points in the outer surface image 200 that have the same XY coordinates but different Z coordinates. Figure 4For example, if the reference line D has one intersection point in the image of the surface of the plastic mold 100, the gap 220 corresponding to the position is considered to be the first gap 221, or there is no gap 220. If the reference line D' has two intersection points with the outer surface image 200, the gap 220 corresponding to the position is considered to be the second gap 222.
[0054] It should be understood that in this method, the three-dimensional coordinate system can be constructed as described above, and the external surface image 200 can be processed by software in the above manner to confirm the position of the second notch 222. Alternatively, the second notch 222 can be directly marked in the external surface image 200 by a staff member, and the position of the second notch 222 marked by the staff member can be obtained by software.
[0055] Step 003: polishing all the gaps 220 whose side walls are blocked, increasing the opening area of the gaps 220, and making the side walls of the gaps 220 exposed;
[0056] Specifically, Figure 5 As shown, after the position of the second notch 222 is confirmed, all the second notches 222 are polished to increase the opening area of the second notch 222, so that all the side walls of the second notch 222 are exposed, thereby forming a first notch 221, which is convenient for subsequent 3D printing operations.
[0057] During the specific grinding, grinding can be performed by a milling cutter or other mechanized tools. For example, after the position of the second notch 222 is confirmed, the control system determines the milling path of the milling cutter according to the position and size of the second notch 222, thereby increasing the opening area of the second notch 222.
[0058] For example, the gap 220 blocked by the side wall can be polished into a gap 220 with a V-shaped cross section. Of course, in addition to the V-shaped gap 220, it can also be polished into a trapezoidal gap 220 with a large upper bottom and a small lower bottom or other types of gaps 220.
[0059] After step 003 is completed, the method provided in the embodiment of the present application can also perform a 3D scan on the plastic mold 100 again after polishing all the gaps 220 whose side walls are blocked, to confirm whether all the gaps 220 on the plastic mold 100 are gaps 220 with exposed side walls; if the 3D scanning result shows that there are still gaps 220 with blocked side walls, polish again until it is confirmed through 3D scanning that all the gaps 220 are gaps 220 with exposed side walls.
[0060] That is, step 002 is repeated to scan the surface of the plastic mold 100 again, and confirm whether all the second gaps 222 are processed (that is, there are no second gaps 222 in the scanned outer surface image 200). If the second gaps 222 still exist in the scanned result, step 003 is repeated.
[0061] When determining whether the second notch 222 exists, the placement surface of the plastic mold 100 is used as a reference surface to construct an XYZ reference coordinate system, wherein the reference surface is the XY plane. The construction method is the same as that in step 002 and will not be repeated here.
[0062] In addition, if any two points in the vertical projection of the outer surface image 200 on the XY plane do not overlap, then all the gaps 220 are confirmed to be gaps 220 with exposed side walls. That is, if there is only one intersection point between the reference line D and the outer surface image 200, then all the gaps 220 are considered to be first gaps 221.
[0063] In this step, step 002 and step 003 are repeated until no second notch 222 is found in the structure scanned in step 002, and then the next step 004 is executed.
[0064] Step 004: Acquire an unworn image of the plastic mold 100 and slice the unworn image according to the height of 3D printing;
[0065] Specifically, the unworn image of the plastic mold 100 is the initial image of the plastic mold 100, that is, the target image after the plastic mold 100 is repaired in the mold repair method provided in the embodiment of the present application. In the embodiment of the present application, the mold is repaired with reference to the unworn image of the plastic mold 100 to repair the plastic mold 100. It should be understood that the unworn image of the plastic mold 100 provided in the embodiment of the present application is a three-dimensional image, which can be obtained by obtaining the initial processing drawing of the plastic mold 100, or by 3D scanning and constructing the unworn plastic mold 100. Of course, it can also be obtained by other means, which will not be shown one by one in the embodiment of the present application.
[0066] In this method, the unworn image of the plastic mold 100 is sliced, and the specific slicing is performed according to the height of the 3D print. It should be understood that in order to ensure the position correspondence, the unworn image in the embodiment of the present application and the plastic mold 100 to be repaired can be located in the same coordinate system to ensure that the position of the unworn image of the plastic mold 100 can correspond to the position of the plastic mold 100 to be repaired. Exemplarily, the unworn image and the mold to be repaired are both located in the XY plane, and the height direction is along the Z direction. Of course, the two can also be located in different coordinate systems, and the coordinates of the plastic mold 100 to be repaired can be made to correspond to the coordinates of the unworn image through coordinate conversion.
[0067] When slicing the unworn image, the slice data is obtained, and the slice data can be directly obtained by dividing the unworn image into slices. The slice data includes the coordinate position of the slice in the X direction, the Y direction and the Z direction.
[0068] Exemplarily, during 3D printing, along the Z direction, the 3D printing device prints layer by layer, and the height of each layer is H. Then, the unworn image of the plastic mold 100 is sliced along the Z direction according to the height of each layer being h (h≤H). Thus, the height of each layer of slices matches the height of 3D printing. Exemplarily, along the Z direction height, the unworn image of the plastic mold 100 can be cut into slices of different numbers such as slices B1, B2, B3, ... Bn, where n is a positive integer greater than 3, to prepare for subsequent 3D printing.
[0069] The above-mentioned slicing of the unworn image can be specifically processed by the host computer of the 3D printing device. After obtaining the unworn image, the host computer can slice the unworn image through image processing software. The slicing provided in the embodiment of the present application does not refer to actual cutting of the unworn image, but virtual cutting on the unworn image to obtain data of each slice.
[0070] Step 005: Scan the plastic mold 100 layer by layer according to the slices, and compare the scanned image with the corresponding slices, and confirm whether there are defects based on the comparison results; if there are defects, fill the defects to the thickness of the corresponding slices through 3D printing, and cure the filled material through ultraviolet rays.
[0071] Specifically, when repairing the plastic mold, the plastic mold 100 is scanned layer by layer according to the slices, and the repair is performed in real time, so as to be repaired layer by layer according to the slices. Exemplarily, when repairing slice A1, the plastic mold 100 is scanned by a 3D printing device, the scanned image is compared with the corresponding slice, and whether there is a defect is confirmed based on the comparison structure. For example, the image of the scanned plastic mold 100 is compared with the data of the slice. Compare the coordinates of the slice and the image of the scanned plastic mold 100. If the coordinates of a point on the slice are (X1, Y1, Z1), and the coordinates of the corresponding position of the scanned plastic mold 100 are also (X1, Y1, Z1), it is determined that there is no defect at the position. If the coordinates of a point on the slice are (X1, Y1, Z1), and the coordinates of the corresponding position of the scanned plastic mold 100 are also (X1, Y1, Z2), and Z2>Z1, it is confirmed whether there is a defect at the position. If the coordinates of a point on the slice are (X1, Y1, Z1), and the coordinates of the corresponding position of the scanned plastic mold 100 are also (X1, Y1, Z2), and Z2 < Z1, it is confirmed whether there is a defect at this position. The defect is filled to the thickness of the corresponding slice by 3D printing, and the filling thickness is Z1-Z2. After filling, the filled material is cured by ultraviolet light. It should be understood that the defect in the embodiment of the present application is a part of the gap 220.
[0072] Exemplary, reference Figure 6 As shown in Figure 6 The corresponding slices B1, B2 and B3 on the plastic mold 100 are exemplified, and the plastic mold 100 has a notch 220 (after step 002, only the first notch 221 exists on the plastic mold 100). Figure 3 It can be seen that according to the division of slices, the gap 220 is divided into two areas, among which the area corresponding to slice B1 does not have the gap 220, while the areas corresponding to slices B2 and B3 have defects. When scanning specifically, first scan according to slice B1. When scanning, because slice B1 is located at the bottom and the area corresponding to slice B1 does not have the gap 220, the coordinates in the Z direction corresponding to slice B1 are either consistent with the coordinates in the Z direction of the unworn image. When scanning according to slice B2, at the position of the corresponding defect, the coordinates in the Z direction of the position in the scanned image are smaller than the coordinates in the Z direction of slice B2 in the unworn image, so it is repaired. When scanning according to slice B3, at the position of the corresponding defect, the coordinates in the Z direction of the position in the scanned image are smaller than the coordinates in the Z direction of slice B3 in the unworn image, so it is repaired. Thus, the repair of the plastic mold 100 is finally completed. After the repair, as shown Figure 7 As shown by Figure 7It can be seen that the plastic mold 100 provided in the embodiment of the present application is filled with multiple layers and the material is immediately solidified during filling, thereby enhancing the solidification effect of the filled material and also increasing the structural strength of the plastic mold 100 after repair.
[0073] In the solution provided in the embodiment of the present application, the scanned image is compared with the slice in real time, that is, after scanning a position, the coordinates of the position are immediately compared with the coordinates of the corresponding position on the slice, and if there is a defect, the material is immediately replenished and cured immediately. Thus, the effect of scanning, repairing and curing at the same time is achieved, which improves the efficiency of repairing.
[0074] In addition, in a specific implementation, the 3D printing device provided in the embodiment of the present application includes a scanning head, a printing head and a curing head, wherein the scanning head is used to perform a 3D scan on the plastic mold 100, and the scanning head may be a laser scanner. The printing head is used to fill the defects with materials (such as resin, or other printable materials that are the same or similar to the plastic mold 100), and the curing head is used to UV-cure the filled materials. When the three components are specifically arranged, along the scanning path, the scanning head is located at the front, the printing head is located in the middle, and the curing head is located at the tail, so that scanning, filling, and curing can be achieved along the scanning path. The above controls can all be controlled by the host computer of the 3D printing device to realize automatic control of the 3D printing device to repair the plastic mold 100.
[0075] That is, in the solution disclosed in the present application, the outer surface of the plastic mold 100 is scanned by a scanning component that moves synchronously with the print head of the 3D printer; and during the scanning process, the scanned defects are filled and cured synchronously.
[0076] The material provided in the embodiment of the present application has a liquid bridge phenomenon, which is that the uncured material droplets change the surface of the liquid from a curved surface to a flat surface due to the capillary phenomenon between the already cured resin protrusions. For example, when the material is a resin, the resin is viscous and has low fluidity. When it is filled into the gap 220, a liquid bridge phenomenon will appear, thereby forming a curved surface. After each layer is printed, dense bulges are formed in the gap 220.
[0077] The method provided in the embodiment of the present application further includes: after each printing of the corresponding area of the slice, scanning the corresponding area of the slice again, and performing compensation printing for the defects of the filling material after filling and curing. When performing compensation printing, the material is filled between the formed curved surfaces, so that the formed bulges are filled and leveled through the liquid bridge phenomenon, thereby obtaining a relatively flat surface to facilitate the printing of subsequent layers.
[0078] It should be understood that the 3D printing used in the embodiment of the present application is specifically 3D inkjet printing technology. 3D inkjet printing technology is used to repair the worn surface of the injection mold. The surface roughness after printing can reach less than 10nm, and no secondary grinding is required. It can be directly used as a mold.
[0079] It can be seen from the above description that the surface of the mold is processed in the early stage to remove burrs and protrusions, and then 3D scanning is performed to open the hidden gap 220 on the back of the side wall on the outer surface of the mold, so as to facilitate subsequent 3D printing. During the printing process, the mold is sliced according to the unworn image, and the actual situation of the corresponding position of the current slice is obtained through real-time scanning, and 3D printing is performed according to the actual situation, which facilitates the repair of the mold.
[0080] The method provided in the embodiment of the present application may further include the following steps:
[0081] Step 006: After the plastic mold 100 is repaired, ultraviolet curing is performed for a second time in an oxygen-free environment. Specifically, the plastic mold 100 is placed in a sealed oxygen-free environment, and then the plastic mold 100 is irradiated with an ultraviolet lamp to further cure the material filled on the plastic mold 100, thereby improving the strength of the repaired plastic mold 100.
[0082] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.
[0083] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
Claims
1. A method for repairing a plastic mold, characterized in that: The following steps are involved: Grinding the damaged plastic mold to remove protrusions or burrs on the plastic mold; Scanning the plastic mold and confirming all the gaps on the side walls of the mold that are blocked; Polishing all the gaps whose side walls are blocked to increase the opening area of the gaps and expose the side walls of the gaps; Acquire an unworn image of the plastic mold, and slice the unworn image according to a 3D printed height; Scanning the plastic mold layer by layer according to the slices, and comparing the scanned images with the corresponding slices, and confirming whether there are defects according to the comparison results; If there is a defect, it is filled by 3D printing to the thickness of the corresponding slice, and the filled material is cured by ultraviolet light.
2. The method for repairing a plastic mold according to claim 1, characterized in that: The step of scanning the plastic mold and confirming all gaps on the side walls of the mold that are blocked specifically includes: Scanning the outer surface of the plastic mold by a 3D scanner to generate an outer surface image of the plastic mold; All the gaps blocked by the side walls are confirmed based on the outer surface image scanned by the 3D scanner, and the positions of the gaps blocked by the side walls are confirmed.
3. The method for repairing a plastic mold according to claim 2, characterized in that: The step of confirming all the gaps blocked by the side walls according to the outer surface image scanned by the 3D scanner and confirming the positions of the gaps blocked by the side walls is specifically as follows: Taking the placement surface of the plastic mold as a reference surface, constructing an XYZ reference coordinate system, wherein the reference surface is an XY plane; Get the coordinates of any point of the outer surface image in the XYZ coordinate system, if any two points satisfy: The coordinates of the first point are: X=a, Y=b, Z=c1; the coordinates of the second point are: X=a, Y=b, Z=c2, and the absolute value of c1-c2 is greater than 0, then the gaps corresponding to the first point and the second point are determined to be gaps blocked by the side wall; among them, a, b, c1, and c2 are all greater than 0.
4. The method for repairing a plastic mold according to claim 3, characterized in that: It also includes performing 3D scanning on the plastic mold again after polishing all the gaps blocked by the side walls to confirm whether all the gaps on the plastic mold are gaps with exposed side walls; If the 3D scanning result shows that there are still gaps blocked by the side wall, polishing is performed again until it is confirmed through 3D scanning that all the gaps are gaps exposed on the side wall.
5. The method for repairing a plastic mold according to claim 4, characterized in that: After 3D scanning, it was confirmed that all the gaps were gaps exposed on the side walls; specifically: Taking the placement surface of the plastic mold as a reference surface, constructing an XYZ reference coordinate system, wherein the reference surface is an XY plane; If any two points of the outer surface image in the vertical projection of the XY plane do not overlap, it is confirmed that all the gaps are gaps with exposed side walls.
6. The method for repairing a plastic mold according to claim 1, characterized in that: The step of polishing all the gaps whose side walls are blocked increases the opening area of the gaps and makes the side walls of the gaps exposed; specifically, The blocked notch on the side wall is ground into a notch with a V-shaped cross section.
7. The method for repairing a plastic mold according to claim 1, characterized in that: The damaged plastic mold is polished to remove protrusions or burrs on the plastic mold; specifically: The plastic mold is polished by sandpaper or a grinding wheel to remove protrusions or burrs on the plastic mold.
8. The method for repairing a plastic mold according to any one of claims 1 to 7, characterized in that: The plastic mold is scanned layer by layer according to the slices, and the scanned image is compared with the corresponding slices, and whether there is a defect is confirmed according to the comparison result; if there is a defect, the defect is filled to the thickness of the corresponding slice by 3D printing, and the filled material is cured by ultraviolet light; specifically: The outer surface of the plastic mold is scanned by a scanning component that moves synchronously with the print head of the 3D printer; and during the scanning process, the scanned defects are filled and cured synchronously.
9. The method for repairing a plastic mold according to claim 8, characterized in that: Also includes: After each printing of the area corresponding to the slice is completed, the area corresponding to the slice is scanned again, and compensation printing is performed for defects of the filling material after filling and curing.
10. The method for repairing a plastic mold according to claim 8, characterized in that: The method also includes performing a second ultraviolet curing in an oxygen-free environment after repairing the plastic mold.