CN113524519A - Manufacturing method of mold for processing backlight plate of display screen for vehicle - Google Patents
Manufacturing method of mold for processing backlight plate of display screen for vehicle Download PDFInfo
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- CN113524519A CN113524519A CN202111089925.4A CN202111089925A CN113524519A CN 113524519 A CN113524519 A CN 113524519A CN 202111089925 A CN202111089925 A CN 202111089925A CN 113524519 A CN113524519 A CN 113524519A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3835—Designing moulds, e.g. using CAD-CAM
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0075—Light guides, optical cables
Abstract
The invention discloses a manufacturing method of a mold for processing a backlight plate of a vehicle display screen, which is characterized in that a material is reserved on the mold in advance, the mold capable of meeting the form and position tolerance requirements of a product drawing is finally manufactured through data analysis, meanwhile, the mold core on the mold is not required to be subjected to welding and material accumulation treatment, and the service life of the mold is greatly prolonged.
Description
Technical Field
The invention relates to a manufacturing method of a mold, in particular to a manufacturing method of a mold for processing a backlight plate of a display screen for a vehicle.
Background
The plastic baffle plate, called backlight plate, called light guide, behind the liquid crystal display screen of the automobile is made of PC material by injection molding. Since the liquid crystal display screen is widely used in the current automobile, the parts of the backlight plate have wide application. As can be seen from the product plan view of fig. 1 and the top view of fig. 2, the backlight is a rectangular flat plate. Because of the large area, the requirement for the flatness of the whole backlight plate is too high to mount the display screen on the backlight plate flatly. In order to reduce the difficulty of processing, a method is generally adopted in which 5 small bearing surfaces, namely a first small bearing surface 121, a second small bearing surface 122, a third small bearing surface 123, a fourth small bearing surface 124 and a fifth small bearing surface 125, are arranged on a plane as shown in fig. 1, the 5 small bearing surfaces are theoretically on the same plane, and as can be seen from the top view of fig. 2, the positions of the back surfaces a1, a2 and A3 of the product are the bottom surfaces of 3 screw columns, which correspond to the product and can be regarded as an a reference, namely 0 position in the X direction, and in the actual product processing process, one usually arranges the second small bearing surface 122, the third small bearing surface 123 and the fourth small bearing surface 124 on a plane, and the 3 surfaces are discontinuous, but theoretically, the 3 surfaces are the same plane and the same plane. Since the liquid crystal display panel of the automobile is placed on the face, it is required that the face is very flat, the face has an angle of 0.85 degrees with the a reference, and more importantly, the face has a flatness requirement of 0.3 mm. While the first small bearing surface 121 and the fifth small bearing surface 125 are arranged on the other plane, that is, in the X direction, the second small bearing surface 122, the third small bearing surface 123, and the fourth small bearing surface 124 are one size with respect to the a reference, and the first small bearing surface 121 and the fifth small bearing surface 125 are the other size with respect to the a reference. To ensure the fluctuation value of the distance of the 5 points relative to the A reference, the flatness of the 5 points can be controlled within 0.3, and the rest part of the surface is smoothly connected with the corresponding area of the 5 points, so that the flatness of the whole surface can be judged to be within 0.3mm, and the requirement of a drawing is met.
However, in the manufacturing process of the plastic mold, the final deformation of the plastic product after injection molding is not necessarily deformed according to the preset idea, but is a complicated deformation process. The dimensions of the final plastic part obtained after deformation are based on the dimensions of the actual product. And is influenced by various factors such as injection molding process, measurement error, pouring gate position, product structure, mold cooling, molecular orientation in the process of filling the cavity with plastic, product shrinkage and the like. The difficulty is that the dimension of a plastic part product is required to be 100% in accordance with a drawing, particularly, form and position tolerance generated by deformation after injection molding determines that the actual difference between the actual dimension of the plastic part and the dimension of the drawing needs to be measured after a mold is tested in an initially designed and manufactured mold, and the requirement of the drawing is met by correcting the difference of corresponding parts of the mold. In the process of modifying the die, if the die amount is too much, only simple cutting is needed to remove the excessive size, but when the die amount is too little, the die is achieved only by welding the die core on the die, accumulating materials and then machining. However, in the process of welding the workpiece, the problems that the high temperature of the workpiece changes, whether the welding layer and the original material layer are 100% fused in place or not are involved, and the like, and the welding layer of the die is easy to fall off due to the mode, so that the service life of the die is shortened.
Disclosure of Invention
The invention aims to provide a manufacturing method of a mold for processing a backlight plate of a vehicle display screen, which can conveniently correct the mold and does not reduce the service life of the mold.
The technical scheme adopted by the invention for solving the technical problems is as follows: a manufacturing method of a mold for processing a backlight plate of a vehicle display screen is characterized in that three screw columns are arranged on the back surface of the backlight plate, the end surfaces of the three screw columns are positioned on the same plane, the front surface of the backlight plate is provided with 5 small supporting surfaces which are respectively a first small supporting surface and a fifth small supporting surface positioned on the lower side of the backlight plate, and a second small supporting surface, a third small supporting surface and a fourth small supporting surface positioned on the upper side of the backlight plate, the first small supporting surface and the fifth small supporting surface are positioned on the same plane, the second small supporting surface, the third small supporting surface and the fourth small supporting surface are positioned on the same plane, when the mold is processed, a first mold reserved layer is additionally arranged on a fixed mold core corresponding to the end surfaces of the screw columns according to design parameters, a second mold reserved layer is additionally arranged on a movable mold core corresponding to the small supporting surfaces according to design parameters, after testing the die, measuring the distance between the end surfaces of the three screw columns and each small supporting surface, firstly selecting the minimum difference value to reduce the material of the first die repairing reserved layer according to the difference value between the measured actual parameter and the theoretical parameter, when the thickness of the first die repairing reserved layer is larger than the minimum difference value, the thickness value of the material of the first die repairing reserved layer is the minimum difference value, when the thickness of the first die repairing reserved layer is smaller than or equal to the minimum difference value, the thickness value of the material of the first die repairing reserved layer is the thickness value of the first die repairing reserved layer, then reducing the material of the second die repairing reserved layer at the position corresponding to each small supporting surface, and the thickness value of the material of the second die repairing reserved layer is the difference value obtained by subtracting the minimum difference value from the actual parameter and the theoretical parameter of the distance between the end surfaces of the three screw columns and each small supporting surface, and finishing the manufacture of the die after finishing the material reduction of all the second die repairing reserved layers.
Preferably, the thickness ratio of the first die repair reserved layer to the second die repair reserved layer is 2: 3.
further preferably, the sum of the thicknesses of the first die repair reserved layer and the second die repair reserved layer is greater than or equal to 0.5 mm.
The length of the backlight plate is 262.2mm, the width is 107.3mm, the height is 17.6mm, the theoretical distance between the end face of each screw column and the first small supporting surface is 13.185mm, the theoretical distance between the end face of each screw column and the second small supporting surface is 14.635mm, the thickness of the reserved layer of the first trimming mold is 0.2mm, and the thickness of the reserved layer of the second trimming mold is 0.3 mm.
Compared with the prior art, the invention has the advantages that the mould which can meet the form and position tolerance requirements of the drawing of the product is finally manufactured by a mode of reserving materials on the mould in advance and data analysis, and meanwhile, the mould core on the mould is not required to be subjected to welding and material accumulation treatment, so that the service life of the mould is greatly prolonged.
Drawings
FIG. 1 is a schematic plan view of a backlight panel for a display screen of a vehicle;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic plan view of a mold cavity insert fabricated by the method of the present invention according to an example of the present invention;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is an enlarged view at E in FIG. 4;
FIG. 6 is a schematic plan view of a core insert of a mold fabricated by the method of the present invention according to an example of the present invention;
FIG. 7 is a cross-sectional view A-A of FIG. 6;
FIG. 8 is a cross-sectional view B-B of FIG. 6;
FIG. 9 is an enlarged view at F in FIG. 7;
FIG. 10 is an enlarged view at G of FIG. 7;
fig. 11 is an enlarged view of fig. 8 at H.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example (b): a method for manufacturing a mold for processing a backlight plate of a vehicle display screen comprises the steps of arranging three screw columns 11 on the back surface of a backlight plate 1, arranging the end surfaces of the three screw columns 11 on the same plane, arranging 5 small supporting surfaces 12 on the front surface of the backlight plate 1, namely a first small supporting surface 121 and a fifth small supporting surface 125 which are respectively arranged on the lower side of the backlight plate 11, and a second small supporting surface 122, a third small supporting surface 123 and a fourth small supporting surface 124 which are arranged on the upper side of the backlight plate 11, arranging the first small supporting surface 121 and the fifth small supporting surface 125 on the same plane, arranging the second small supporting surface 122, the third small supporting surface 123 and the fourth small supporting surface 124 on the same plane, increasing a first mold trimming layer 21 on a fixed mold core 2 corresponding to the end surfaces of the screw columns according to design parameters when the mold is processed, and arranging a second mold trimming layer 31 on a movable mold core 3 corresponding to the small supporting surfaces according to the design parameters as shown in reserved in figures 3-5, as shown in FIGS. 6 to 11; after testing the mold, measuring the distance between the end face of the three screw columns and each small supporting face, according to the difference between the measured actual parameter and the theoretical parameter, firstly selecting the minimum difference to reduce the material of the first mold repairing reserving layer 21, when the thickness of the first mold repairing reserving layer 21 is larger than the minimum difference, the thickness value of the material of the first mold repairing reserving layer 21 is the minimum difference, when the thickness of the first mold repairing reserving layer 21 is smaller than or equal to the minimum difference, the thickness value of the material of the first mold repairing reserving layer 21 is the thickness value of the first mold repairing reserving layer 21, then reducing the material of the second mold repairing reserving layer 31 at the position corresponding to each small supporting face, the thickness value of the material of the second mold repairing reserving layer 31 is the difference between the measured actual parameter and the theoretical parameter of the distance between the end face of the three screw columns and each small supporting face, and after completing the material reduction of the second mold repairing layer 31, and (5) finishing the manufacturing of the die.
The present invention is further specifically described below by way of an example.
The backlight in this example has a length of 262.2mm, a width of 107.3mm and a height of 17.6mm, where the positions a1, a2 and A3 in top view are the bottoms of the screw posts 11 at 3, which corresponds to a product and can be considered as an a reference. Which is also 0 bit in the X direction. In front view, there are 5 small bearing surfaces such as a first small bearing surface 121, a second small bearing surface 122, a third small bearing surface 123, a fourth small bearing surface 124, and a fifth small bearing surface 125, and these 5 small bearing surfaces are theoretically on the same surface, and from the viewpoint of the product shape, the first small bearing surface 121 is on one surface, the second small bearing surface 122, the third small bearing surface 123, the fourth small bearing surface 124 are on one surface, and the fifth small bearing surface 125 is on one surface. Although the 3 surfaces are not continuous, the 3 surfaces are in theory coplanar and are in the same plane. Since the liquid crystal display on the car is placed on this side. The face is required to be very flat with an angle of 0.85 degrees to the a datum and more importantly, the face is required to have a flatness of 0.3 mm. In the design, the theoretical distance between the end surfaces of the three screw posts 11 and the first small bearing surface 121 is 13.185mm, the theoretical distance between the end surfaces of the three screw posts and the second small bearing surface 122 is 14.635mm, and the flatness OK and NG of the three screw posts are determined by the distance values of 5 small bearing surfaces, namely the first small bearing surface 121, the second small bearing surface 122, the third small bearing surface 123, the fourth small bearing surface 124 and the fifth small bearing surface 125, from the a reference. To ensure the fluctuation value of the distance between the 5 small bearing surfaces and the A reference, the flatness of the 5 small bearing surfaces can be controlled within 0.3, and the rest part of the surface is smoothly connected with the corresponding area of the 5 small bearing surfaces, so that whether the flatness of the whole surface is within 0.3mm or not can be judged, and whether the flatness meets the requirements of the drawing or not can be judged.
Aiming at the part of the backlight plate, the requirement of the flatness of 0.3 is met, and in the link of mold design, the following adjustment is firstly carried out on the product size. Similarly, the design value of the mold is also 0.2mm in thickness of the first mold repair reserve layer 21 and 0.3mm in thickness of the second mold repair reserve layer 31 corresponding to the following design specification values (material).
After the product is injection molded by the mold, the X data of 5 small bearing surfaces, namely the first small bearing surface 121, the second small bearing surface 122, the third small bearing surface 123, the fourth small bearing surface 124 and the fifth small bearing surface 125, of the product are actually measured by the measuring tool, so that the following results are obtained:
the distance between the end surfaces of the three screw posts 11 and the first small bearing surface 121 is 12.67mm, the distance between the end surfaces of the three screw posts 11 and the second small bearing surface 122 is 14.438mm, the distance between the end surfaces of the three screw posts 11 and the third small bearing surface 123 is 14.0928mm, the distance between the end surfaces of the three screw posts and the fourth small bearing surface 124 is 14.423mm, and the distance between the end surfaces of the three screw posts 11 and the fifth small bearing surface 125 is 12.656mm, and the above results are analyzed in the following table:
as can be seen from the above table, the theoretical residual material amount of the a datum plus the 5 small bearing surfaces, i.e., the first small bearing surface 121, the second small bearing surface 122, the third small bearing surface 123, the fourth small bearing surface 124 and the fifth small bearing surface 125, is 0.5mm, and it is normally understood that after the product is injection-molded, the product should meet the design specification value (residual material), but the actual deviation amount is the rightmost value in the above table, and the deviation amount of X at 3 positions of the first small bearing surface 121, the third small bearing surface 123 and the fifth small bearing surface 125 has a deviation amount of 0.015,0.0422 and 0.029 from 0.5. Substantially meets the expected requirements. Since the 3 points of the first small bearing surface 121, the third small bearing surface 123 and the fifth small bearing surface 125 are near the fixed point of the measuring tool, the dimension is stable. Explaining that the theoretical residual material amount of the 3 points of the first small supporting surface 121, the third small supporting surface 123 and the fifth small supporting surface 125 is consistent with the actual deviation amount, when the die is repaired, the theoretical residual material amount of the 3 points of the first small supporting surface 121, the third small supporting surface 123 and the fifth small supporting surface 125 is only required to be removed, namely the A reference plus the residual material amount of the first small supporting surface 121, the third small supporting surface 123 and the fifth small supporting surface 125 is 0.2+0.3=0.5, so that the requirement of the flatness of the 3 points X value of the first small supporting surface 121, the third small supporting surface 123 and the fifth small supporting surface 125 on the flatness of 0.3 can be met.
However, in the two points, i.e., the second small bearing surface 122 and the fourth small bearing surface 124, the deviation amount of the actual X value is 0.197 and 0.212, and is not about 0.5 as expected. Since, for plastic products, the dimensions of the product after injection moulding do not vary as expected, subject to multiple factors, deformations occur in the product, the exact value of which, unpredictable, can only be obtained by measuring the actual product data. This is why the actual X value deviates from 0.197 to 0.212, and does not deviate from about 0.5 as expected. For the actual product, two points, the second small bearing surface 122 and the fourth small bearing surface 124, are relative to the a reference in fig. 1. Also the 0 bit in the X direction, has a variation of 0.303 and 0.288, which is a factor to be considered in trimming the mold. Only by considering the factors, the direction of the trimming die can be correct, and the product size can be trimmed to be qualified. Therefore, the amount of the remaining material of 0.5 can be simply removed as in the case of the first small bearing surface 121, the third small bearing surface 123 and the fifth small bearing surface 125, and the amount of the remaining material of the second small bearing surface 122 and the fourth small bearing surface 124 added to the reference a is corrected according to the actual deformation amount of the product. This is also the reason why the pre-reserved material needs to be designed earlier before the mold is designed. Because of the unpredictability of the deformation amount, only the material is reserved through the early design, and then the size of the die is corrected through the actual product measurement value. That is, the modification amounts to 0.197 and 0.212 for the trimming of the second small bearing surface 122 and the fourth small bearing surface 124 at two points cannot be the original amount of 0.5 of the remaining material.
Therefore, the final evaluated mold repair solution is as follows, while considering the modifications of the a datum and the 5 small bearing surfaces of the first small bearing surface 121, the second small bearing surface 122, the third small bearing surface 123, the fourth small bearing surface 124 and the fifth small bearing surface 125 as shown in the following table:
from the above die repair scheme, it can be seen that: the 3 modifications a1, a2 and A3 are 0.2, that is, 0.2 of the amount of material left before the a reference first trimming reserved layer 21 is removed. Similarly, the margin of 0.2 is removed for the first mold repair allowance layer 21 with the second small bearing surface 122 and the fourth small bearing surface 124. As analyzed previously, the remaining amount of the second mold repair reserve layer 31 at 3 of the first small bearing surface 121, the third small bearing surface 123 and the fifth small bearing surface 125 is 0.3, which is to be considered in the mold repair scheme. The trimming modulus of the first small bearing surface 121, the third small bearing surface 123 and the fifth small bearing surface 125 is 0.3. However, regarding the remaining amount of 0.3 of the second trimming reserved layer 31 at two positions of the second small supporting surface 122 and the fourth small supporting surface 124, it cannot be considered that the trimming amount can only be 0 in the trimming scheme.
Actually measuring the product after die repairing to obtain the following results:
the distance between the end face of the three screw columns 11 and the first small support surface 121 is 13.159 mm, the distance between the end face of the three screw columns 11 and the second small support surface 122 is 14.74mm, the distance between the end face of the three screw columns 11 and the third small support surface 123 is 14.593mm, the distance between the end face of the three screw columns 11 and the fourth small support surface 124 is 14.773mm, and the distance between the end face of the three screw columns 11 and the fifth small support surface 125 is 13.151mm, so that the X values of the 5 small support surfaces, namely the first small support surface 121, the second small support surface 122, the third small support surface 123, the fourth small support surface 124 and the fifth small support surface 125, meet the requirement of tolerance and the flatness is 0.185. This pre-left material is accounted for and the trimming scheme to adjust the trim modulus is correct after the product is deformed.
Claims (4)
1. A manufacturing method of a mold for processing a backlight plate of a vehicle display screen is characterized in that a first mold repairing layer is additionally arranged on a fixed mold core corresponding to the end face of a screw column according to design parameters, a second mold repairing layer is additionally arranged on a movable mold core corresponding to the small support surface according to the design parameters, after testing the die, measuring the distance between the end surfaces of the three screw columns and each small supporting surface, firstly selecting the minimum difference value to reduce the material of the first die repairing reserved layer according to the difference value between the measured actual parameter and the theoretical parameter, when the thickness of the first die repairing reserved layer is larger than the minimum difference value, the thickness value of the material of the first die repairing reserved layer is the minimum difference value, when the thickness of the first die repairing reserved layer is smaller than or equal to the minimum difference value, the thickness value of the material of the first die repairing reserved layer is the thickness value of the first die repairing reserved layer, then reducing the material of the second die repairing reserved layer at the position corresponding to each small supporting surface, and the thickness value of the material of the second die repairing reserved layer is the difference value obtained by subtracting the minimum difference value from the actual parameter and the theoretical parameter of the distance between the end surfaces of the three screw columns and each small supporting surface, and finishing the manufacture of the die after finishing the material reduction of all the second die repairing reserved layers.
2. The manufacturing method of the mold for processing the backlight plate of the display screen for the vehicle as claimed in claim 1, wherein the thickness ratio of the first mold repairing reserved layer to the second mold repairing reserved layer is 2: 3.
3. the method for manufacturing the mold for processing the backlight plate of the display screen for the vehicle as claimed in claim 1, wherein the sum of the thicknesses of the first mold repairing reserved layer and the second mold repairing reserved layer is greater than or equal to 0.5 mm.
4. The manufacturing method of the mold for processing the backlight plate of the display screen for the vehicle as claimed in claim 1, wherein the length of the backlight plate is 262.2mm, the width is 107.3mm, the height is 17.6mm, the theoretical distance between the end surface of the three screw posts and the first small supporting surface is 13.185mm, the theoretical distance between the end surface of the three screw posts and the second small supporting surface is 14.635mm, the thickness of the reserved layer of the first trimming mold is 0.2mm, and the thickness of the reserved layer of the second trimming mold is 0.3 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116186944A (en) * | 2023-04-27 | 2023-05-30 | 宁波天龙电子股份有限公司 | Manufacturing method of die for producing precise plastic products |
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| CN103862597A (en) * | 2014-02-24 | 2014-06-18 | 锦丰科技（深圳）有限公司 | Method for manufacturing injection mold |
| CN105458639A (en) * | 2015-11-30 | 2016-04-06 | 东莞市建升压铸科技有限公司 | Method for manufacturing mold |
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2021
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103702529A (en) * | 2013-12-16 | 2014-04-02 | 东莞劲胜精密组件股份有限公司 | Method for manufacturing shell of electronic product |
| CN103862597A (en) * | 2014-02-24 | 2014-06-18 | 锦丰科技（深圳）有限公司 | Method for manufacturing injection mold |
| CN105458639A (en) * | 2015-11-30 | 2016-04-06 | 东莞市建升压铸科技有限公司 | Method for manufacturing mold |
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| CN116186944A (en) * | 2023-04-27 | 2023-05-30 | 宁波天龙电子股份有限公司 | Manufacturing method of die for producing precise plastic products |
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