Bra mold cup personalized customization method based on 3D printing technology

Abstract

The invention discloses a 3D printing technology-based bra mold cup personalized customization method, which comprises the following steps of: constructing a personalized customized mold cup model according to consumer demands and individual data, performing porous design with gradient modulus on the interior of the mold cup model in combination with a mold cup shaping mechanism, and finally printing and outputting the mold cup model through a 3D printing technology. And personalized customization of the bra mold cup is completed. By adopting the method, personalized customization of'one cup for one person 'of the bra mold cup can be realized, meanwhile, one-time forming of the mold cup can be ensured, and the environmental pollution degree is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of textile clothing and relates to a method for personalized customization of bra cups based on 3D printing technology. Background Art

[0002] At present, in the underwear industry, most of the three-dimensional design of the mold cup and its mold is based on reverse engineering design, and is formed in one go through the molding and heat setting technology. A complete set of molds includes a male mold and a female mold, which are located at the upper and lower mold positions in the vertical direction of the working environment. The male mold forms the inner surface of the mold cup, and the female mold forms the outer surface of the mold cup. The male mold and the female mold each contain two molds, which correspond to the symmetrical mold cups of the cup. The designed mold is made by CNC computer numerical control machine tools. When processing the mold cup, it is necessary to close the male and female molds under certain conditions of time, pressure, temperature, etc., and the composite material is molded in the membrane cavity.

[0003] At present, the processing method used is compression molding, which has complicated design and production processes, expensive processing costs, and a relatively long production cycle. At the same time, under the cumbersome production mode, a large amount of energy is wasted, and the backlog of inventory also increases the degree of environmental pollution. Secondly, because mold-cup bras are processed by a set of molds to produce a large number of mold cups with exactly the same shape and size, the bras cannot completely fit the individual size and cannot meet the purchasing needs of the general public. The processing cost of the mold cup mold is high, and it is impossible to achieve personalized customization of "one cup per person" to meet the needs of consumers. Finally, the foam sponge of the mold cup has poor air permeability, and sweat cannot be discharged in time after sweating, which affects the wearing comfort and is easy to breed bacteria. Wearing this type of bra for a long time is not good for breast health. Summary of the invention

[0004] The purpose of the present invention is to provide a method for personalized customization of bra mold cups based on 3D printing technology. The method can realize personalized customization of bra mold cups "one cup for each person" and can also ensure that the mold cups are formed in one time, thereby reducing the degree of environmental pollution.

[0005] The technical solution adopted by the present invention is a method for personalized customization of bra cups based on 3D printing technology, which specifically includes the following steps: Step 1, using a pressure measurement system to perform a molded cup bra wearing pressure experiment to obtain wearing pressure data of each target measurement point; Step 2, based on the data measured in step 1, calculate the elastic coefficient range of the material in each measuring area of ​​the bra cup mold; Step 3, determining the outer surface model of the mold cup; Step 4, constructing a curved surface model of the inner surface of the mold cup; Step 5, assembling the inner and outer surfaces of the mold cup to complete the construction of the bra mold cup model; Step 6, select printing method and printing materials; Step 7, select the printing structure; Step 8, performing a compression elastic modulus test on the sample to obtain the elastic modulus; Step 9, calculating the elastic recovery rate of the sample; Step 10, determining the porous structural units and parameters of the final filling mold cup, filling the mold cup to complete the construction of the mold cup with gradient modulus; Step 11: Print the mold cup to complete the customized mold cup production.

[0006] The present invention is also characterized in that: The specific process of step 1 is: Step 1.1, the entire cup is divided into an upper cup piece and a lower cup piece, the upper cup piece is divided into measurement area I; the lower cup piece is divided into measurement area II and measurement area III; Step 1.2, combining the diameter of the airbag of the pressure measurement system and the size of the inner surface of the mold cup, evenly select three measurement points in each measurement area, and select a total of eight measurement points represented by numbers 1-8; Step 1.3, the airbags of the pressure measurement system are glued and fixed to each measuring point of the mold cup bra bra1, and the customer wears the bra to perform a wearing pressure test to obtain the wearing pressure value F of each measuring point.

[0007] The specific process of step 2 is: Step 2.1, select two bra cups that are exactly the same as those in step 1, mark them as bra2 and bra3 respectively, and use bra1, bra2, and bra3 as experimental objects; Step 2.2, align the measuring point of the mold cup with the airbag attached to the measuring point and place it on the measuring surface of the micrometer. After zeroing, turn the micrometer knob to increase the displacement by △L intervals. Observe until the pressure value of the pressure tester stabilizes, and record the pressure value △F at the displacement. Step 2.3, the compression amount of each measuring point when wearing the mold cup is included in the compression range of the elastic test, and the displacement range size is L; Step 2.4, import the experimental data into Excel, draw the pressure-displacement diagram of the three mold cups at each point, and calculate the data of each measurement point to fit the univariate linear equation y=ax+b, where x is the compression displacement value, y is the pressure value, b is the revised value, and the fitting equation coefficient a is the elastic coefficient E of the sponge material at the measurement point; Step 2.5, integrating the elastic coefficient into elastic coefficient intervals according to the three measuring areas of the mold cup upper piece, lower matching position, and side matching position, and obtaining the elastic coefficient range of the material in each measuring area of ​​the bra mold cup.

[0008] In step 6, select DLP printing mode; select liquid elastic flexible photosensitive resin material resione F80.

[0009] The specific process of step 8 is: Step 8.1, place the sample between the two pressure plates of the UTM5504 universal testing machine, so that the center line of the sample is consistent with the center line of the two pressure plates. The two end faces of the sample should be parallel to the pressure plates. For the test of anisotropic materials, the compression force acts in the direction of future use and design. The height of the upper pressure plate is adjusted so that the upper pressure plate lightly touches the upper surface of the sample; Step 8.2, compress the sample along the main axis of the sample at a speed of v=0.02x until the length of the sample is reduced by 60%. Where x is the side length of the cube and v is in mm / min; Step 8.3, raising the upper pressing plate to the starting height; Step 8.4, based on the experimentally measured stress σ and strain ε, draw a stress-strain curve based on the stress and strain data, and the slope of the curve is the compressive elastic modulus.

[0010] The specific process of step 9 is: Step 9.1, compress to the initial load Q1 state, and record the thickness P of the sample; Step 9.2, compress and apply the main load Q2 at a constant speed V, and record the specimen thickness M; Step 9.3, rebound to the initial load Q1 state, and record the rebound thickness R; Step 9.4: Execute steps 9.1 to 9.3 three times respectively and calculate the average of the three Ps. 、The average of the three M 、The average of the three Rs ; Step 9.5: Calculate the elastic rebound rate E1 of the sample according to the following formula (1): (1).

[0011] The beneficial effects of the present invention are as follows: 1. The wearing pressure value and compression amount of each measuring point of the mold cup are obtained by using the mold cup wearing pressure test and the mold cup elastic compression test, which provides data support for the construction of personalized customized mold cup bras. At the same time, the experimental research results of the elastic distribution of the bra mold cup can provide a basis for the design of mold cups with gradient modulus.

[0012] 2. Using the steps of constructing the inner and outer surfaces of the mold cup, a design method for personalized bra mold cup is proposed, realizing the personalized customization of the mold cup of "one cup for one person". The completed bra mold cup model will be used to design a mold cup model with a gradient modulus porous structure, so as to output it through 3D printing technology to complete the personalized customization of the bra mold cup.

[0013] 3. The personalized customized mold cup is obtained by using a porous design with a gradient modulus. The internal porous structure can not only realize the customization of the bra mold cup for the individual, but also ensure the good air permeability of the bra mold cup and improve the wearing comfort.

[0014] 4. Using 3D printing one-time molding technology to produce bra cups can save the intermediate process of cup mold production, simplify the production process of bra cups, and shorten the production cycle of bra cups. At the same time, the cups are formed in one time without the need to produce molds. Personalized bra cups greatly reduce corporate inventory and reduce the degree of environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of measuring area marking in the method for personalized customization of bra cup molds based on 3D printing technology of the present invention; Figure 2 It is a schematic diagram of measuring point marking of a method for personalized customization of a bra cup mold based on 3D printing technology of the present invention; Figure 3 It is the pressure displacement diagram of point 1 in Table 5; Figure 4 (a) to Figure 4 (c) are schematic diagrams of structural units, Figure 4 (a) is an X-type unit structure, Figure 4 (b) is a tetrahedral unit structure, and Figure 4 (c) is a pentagonal dodecahedron structure; Figure 5 (a) to Figure 5 (c) are unit structure parameters, Figure 5 (a) is the X-type unit structure parameter, Figure 5 (b) is the tetrahedron unit structure parameter, and Figure 5 (c) is the pentagonal dodecahedron structure parameter; Figure 6 It is a mold cup model with a gradient modulus design in the bra mold cup personalized customization method based on 3D printing technology of the present invention; Figure 7 It is the support added when the mold cup is printed in the personalized customization method of the bra mold cup based on 3D printing technology of the present invention; Figure 8 It is a mold cup structure after printing in the bra mold cup personalized customization method based on 3D printing technology of the present invention. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The invention discloses a personalized customization method for bra cups based on 3D printing technology, and constructs a cup model with a gradient modulus by analyzing and studying different porous structures, which ensures shaping and decompression while also greatly improving the breathability of the cup, solving the problem of women feeling stuffy and sticky when wearing bras in summer.

[0018] The present invention designs a personalized bra cup with gradient modulus according to consumer needs and 3D printing methods and materials. The present invention first constructs a personalized cup model according to consumer needs and individual data, then designs the interior of the cup model with a gradient modulus porous design in combination with the cup shaping mechanism, and finally prints out the cup model through 3D printing technology to complete the personalized customization of the bra cup.

[0019] Example 1 The method for personalized customization of bra cup molds based on 3D printing technology of the present invention comprises the following specific steps: Step 1: Use the pressure measurement system in the AMI clothing physiological comfort objective test system (Japan AMI3037-10) to conduct a molded cup bra wearing pressure test to obtain the wearing pressure data of each target measurement point. The specific process of step 1 is: Step 1.1, the cup can be divided into the upper cup piece and the lower cup piece. The upper cup piece protects the breasts and improves the appearance, which is set as measurement area I; the lower cup piece supports and gathers the breasts, and the position of the lower cup piece can achieve the breast shaping effect. According to the position and area of ​​the lower and outer positions, two measurement areas are divided, namely area II and area III. The area of ​​each area is almost equal, such as Figure 1 As shown; Step 1.2, combined with the diameter of the airbag of the pressure measurement system and the size of the inner surface of the mold cup, three measurement points are evenly selected in each measurement area, and a measurement point is selected at the intersection of the lower and outer positions. A total of eight measurement points are selected and represented by numbers 1-8. The positions of the measurement points are as follows: Figure 2 As shown; Step 1.3, the airbags of the pressure measurement system are glued and fixed to each measuring point of the mold cup bra bra1, and the customer wears the bra to perform a wearing pressure test to obtain the wearing pressure value F of each measuring point.

[0020] Step 2, using the pressure measurement system in combination with the micrometer measurement to measure the compression displacement of the target measurement point under the pressure value measured in step 1, and arranging the data to obtain a fitting equation. The coefficient of the fitting equation is the elastic coefficient of the sponge material. The coefficient is integrated into an elastic coefficient range according to each measurement area, and finally the elastic coefficient range of the material of each measurement area of ​​the bra mold cup (i.e., each functional area of ​​the mold cup) is obtained.

[0021] The specific process of step 2 is: Step 2.1, since the compression range of the bra cup elastic compression test is set according to the pressure value obtained from the cup wearing test, the test objects of the cup elastic compression test are three bra cups of the same style as the experimental clothing of the pressure test in step 1, and the other two cup bras are marked as bra2 and bra3 respectively.

[0022] Step 2.2, align the measuring point of the mold cup with the airbag attached to it and place it on the measuring surface of the micrometer. After zeroing, turn the micrometer knob to increase the displacement in increments of △L. Observe until the pressure value of the pressure tester stabilizes, and record the pressure value △F at the displacement.

[0023] Step 2.3, the experimental setting includes the compression amount of each measuring point when wearing the mold cup within the compression range of the elastic test, and the displacement range size is L.

[0024] Step 2.4, import the experimental data into Excel, draw the pressure-displacement diagram of the three mold cups at each point, and calculate the data of each measurement point to fit the univariate linear equation y=ax+b, where x is the compression displacement value, y is the pressure value, b is the revised value, and the fitting equation coefficient a is the elastic coefficient E of the sponge material at the measurement point.

[0025] Step 2.5, integrating the elastic coefficient into elastic coefficient intervals according to the three measurement areas of the mold cup upper piece, lower matching position, and side matching position, and obtaining the elastic coefficient range of the material of each measurement area of ​​the mold cup of the bra (i.e., each functional area of ​​the mold cup).

[0026] Step 3, measuring the chest of the customer, establishing a digital human body model based on the measured human body data, and then intercepting the outer surface of the mold cup to obtain a personalized mold cup outer surface model.

[0027] The specific process of step 3 is: Step 3.1, measuring the chest circumference and underbust circumference of the customer, and obtaining that the chest circumference length of the customer after wearing the bra is a, and the underbust length is b; Step 3.2, use the avatar editor tool in CLO 3D software to change the chest size of the avatar and adjust the chest of the avatar to the ideal state, position and height according to the needs of the customizer; Step 3.3, in UG software, the surface of the human chest model is intercepted as the outer surface of the mold cup model, a complete mold cup contour line is constructed, and the surface within the contour line is intercepted to obtain the surface on the outer surface of the mold cup.

[0028] Step 4, combining the physical experiment in step 1 to obtain the thickness offset of each measuring point of the mold cup, constructing the characteristic curve of the inner surface of the mold cup according to each point, and constructing the surface model of the inner surface of the mold cup.

[0029] The specific process of step 4 is: Import the outer surface model of the mold cup into the UG environment, mark the positions of the measurement points on the outer surface model, and construct the characteristic curve of the inner surface of the mold cup based on the displacement data of each measurement point obtained from the physical experiment in step 2, and then construct the inner surface model of the mold cup.

[0030] Step 5: Assemble the inner and outer surfaces of the mold cup in the UG environment to complete the construction of the bra mold cup.

[0031] The specific process of step 5 is: The constructed inner and outer surface models of the mold cup are combined in the same coordinate system. Since the edge curvatures of the inner and outer surfaces of the mold cup are similar, the edge surfaces of the models overlap and the edges of the models are sharp during the splicing process, which does not conform to the smooth edge characteristics of the mold cups on the market. Therefore, the offset outer and inner surface models of the mold cup are combined, and the surface of the mold cup model is optimized to finally complete the construction of the bra mold cup.

[0032] Step 6: Select printing method and printing material. The specific process of step 6 is as follows: Step 6.1, compare and analyze the principle technology and advantages and disadvantages of each 3D printing method, and select the printing method suitable for mold cup printing. Printing method and printing material selection. Among them, DLP printing method has fast printing speed and high printing accuracy, which is suitable for mold cup printing, so DLP printing method is selected.

[0033] Step 6.2, according to the printing materials on the market suitable for the printing method selected in step 6.1, select a printing material with a softer hardness, and make a selection based on the material's tear strength, tensile strength, elongation at break and other performance parameters. Combined with market evaluation and the demand for printing mold cups, select the liquid elastic photosensitive resin material resione F80, which is an elastic resin with the lowest Shore hardness and elasticity close to silicone rubber. The printed parts are also softer, which best meets the needs of 3D printing mold cups. The specific performance parameters are shown in Table 1. Therefore, this material is selected as the printing material for personalized customized mold cups.

[0034] Table 1 Performance parameters of resione F80 material

[0035] Step 7: Analyze and study the porous structural unit and make a preliminary selection. On this basis, set the value range of the variable parameters of the porous structural unit and design an orthogonal experiment. The specific process of step 7 is: Step 7.1, preliminary analysis and selection of the performance of the porous structural unit, select the unit structure suitable for constructing a bra cup with a gradient modulus. The principles for selecting structural units are as follows: First, select the unit structure with higher compression elasticity during compression, and exclude the unit structure with poor compression elasticity to ensure the wearing pressure comfort of the customized cup; second, compare the porosity of the model under the same parameter modeling. Too low porosity will affect the breathability of the personalized customized cup. The selected porous structural units are represented by A, B, and C respectively.

[0036] Step 7.2, according to the actual thickness of the mold cup constructed in step 5, set the value range of the cube side length parameter x, and set the value range for the parameter variables including the unit structure side length d and the rod diameter l. When taking values, in order to ensure that at least one unit structure can be filled in the thinnest part of the mold cup and to ensure the integrity of the structure, the unit structure side length size cannot be too large. Considering the printer accuracy, the rod diameter of the unit structure cannot be too small; in order to ensure the printing effect and the volume of the cavity formed after the unit structure fills the cube, the diameter of the unit structure cannot be too large.

[0037] Step 7.3, design a three-factor multi-level orthogonal test table based on the three factors in step 7.2: cube side length x, unit structure side length d, and rod diameter l. Different parameter combinations are represented by numbers 1, 2, 3, etc.

[0038] Step 7.4, print the three unit structures selected in step 7.1 according to the structural parameters in the orthogonal experimental design in step 7.3. The printed samples are represented by corresponding letters and numbers according to different porous structural units and structural parameters, such as A1, B1, and C1.

[0039] Step 8: Perform a compression elastic modulus test on the sample to obtain the elastic modulus. According to GB / T 1041-2008 Determination of compression properties of plastics, a UTM5504 universal testing machine is used to perform a compression elastic modulus test on the sample to obtain stress-strain data and obtain the elastic modulus E. The specific process of step 8 is: Step 8.1, place the sample between the two pressure plates of the UTM5504 universal testing machine, so that the center line of the sample is consistent with the center line of the two pressure plates, and the two end faces of the sample should be parallel to the pressure plates. For the test of anisotropic materials, the compression force acts in the direction of future use and design. Adjust the height of the upper pressure plate so that it lightly touches the upper surface of the sample.

[0040] Step 8.2: Compress the specimen along the principal axis of the specimen at a speed of v = 0.02x until the length of the specimen is reduced by 60%, where x is the side length of the cube and v is in millimeters per minute (mm / min).

[0041] Step 8.3, immediately raise the upper pressing plate to the starting height of the upper pressing plate.

[0042] Step 8.4, the experiment will automatically obtain stress σ and strain ε data, and obtain the compressive elastic modulus based on the stress and strain data , the stress and strain data are put into Excel to calculate the stress-strain curve, and the slope of the elastic part of the curve is the compressive elastic modulus.

[0043] Step 9: Perform an elastic recovery test on the sample according to GB / T 20671.2-2006 (Classification system and test methods for non-metallic gasket materials, Part 2: Compression rate and rebound rate test method for gasket materials) and calculate the elastic recovery rate.

[0044] Step 10, determine the porous structure unit and parameter settings of the final filling mold cup, and fill the mold cup with it to complete the construction of the mold cup with gradient modulus. The specific process of step 10 is: The elastic modulus range of each measuring area of ​​the mold cup obtained in step 2, and the elastic modulus and elastic recovery rate obtained from the compression elasticity experiment on the porous unit structure model in steps 8 and 9 are used as data references for designing the gradient modulus distribution of the mold cup, the porous unit structure for filling the mold cup is selected, the parameter settings are determined, and the appropriate porous structure is filled into each functional area of ​​the mold cup to complete the construction of the mold cup model with a gradient modulus.

[0045] Step 11: Print the mold cup to complete the customized mold cup production. The specific process of step 11 is: Add support to the designed mold cup model, print it out through a 3D printer, and perform post-processing such as cleaning and curing on the printed mold cup model to complete the customized mold cup production.

[0046] Example 2 Based on Example 1, the specific process of step 9 is as follows: Step 9.1, compress to the initial load Q1 state, and record the thickness P of the sample; Step 9.2, compress and apply the main load Q2 at a constant speed V, and record the specimen thickness M; Step 9.3, rebound to the initial load Q1 state, and record the rebound thickness R; Step 9.4: Execute steps 9.1 to 9.3 three times respectively and calculate the average of the three Ps. 、The average of the three M 、The average of the three Rs ; Step 9.5: Calculate the elastic rebound rate E1 of the sample according to the following formula (1): (1).

[0047] Example 3 Step 1: Use the pressure measurement system in the AMI clothing physiological comfort objective test system (Japan AMI3037-10) to conduct a molded cup bra wearing pressure experiment to obtain the wearing pressure data of each measuring point.

[0048] Take for example a customer who wears a 75B bra on a daily basis; Step 1.1, mark the measurement areas Ⅰ, Ⅱ, and Ⅲ on the 75B model mold cup; Step 1.2, mark the measurement points; Step 1.3, stick the airbags in the pressure measurement system to the various measuring points of the mold cup bra, and the customer wears the mold cup bra bra1 with a mold cup size of 75B and uses the pressure measurement system to measure Figure 2 The wearing pressure test was carried out at the measuring points shown in Table 2. The wearing pressure values ​​F of the measuring points were measured.

[0049] Table 2 Pressure values ​​F (KPa) at each point of three measurements of mold cup bra bra1

[0050] Step 2, using the pressure measurement system in combination with the micrometer measurement to measure the compression displacement of the target measurement point under the pressure value measured in step 1, and arranging the data to obtain a fitting equation. The coefficient of the fitting equation is the elastic coefficient of the sponge material. The coefficient is integrated into an elastic coefficient range according to each measurement area, and finally the elastic coefficient range of the material of each measurement area of ​​the bra mold cup (i.e., each functional area of ​​the mold cup) is obtained.

[0051] Step 2.1, label the other two bras with the same cups as bra1 used in step 1 as bra2 and bra3.

[0052] Step 2.2, align the measuring point of the mold cup with the airbag attached to the measuring point of bra1 and place it on the measuring surface of the micrometer. After zeroing, turn the micrometer knob to increase the displacement by 0.2mm intervals. Observe until the pressure value of the pressure tester stabilizes, and record the pressure value at the displacement. Repeat step 2.2 for bra2 and bra3 in turn to perform compression displacement test.

[0053] Step 2.3, measure the compression displacement of each measuring point under the pressure data in Table 2, include it in the compression interval of the elastic experiment, and divide the compression displacement range as shown in Table 3.

[0054] Table 3 Compression displacement range of each point of the mold cup

[0055] Step 2.4, import the displacement-pressure data measured within the compression displacement range in Table 3 into an Excel table to fit the linear equation. Taking point 1 as an example, the pressure values ​​measured within the displacement range are shown in Table 4. Draw a scatter plot of the pressure-displacement graph in the Excel table, draw a trend line based on the scatter plot, and obtain the trend equation, such as Figure 3 The pressure-displacement diagrams and linear equations of the three bra cups at each measuring point are shown in Table 5.

[0056] Table 4 Pressure values ​​within the displacement range of point 1

[0057] Table 5 Pressure-displacement equations at each measurement point of the three bra cups

[0058] Step 2.5, integrate the elastic coefficient of the material at each measuring point into an elastic coefficient range according to the regional division in step 1.1, and obtain the elastic coefficient range of the material in each measuring area of ​​the bra cup (i.e., each functional area of ​​the cup). The elastic coefficient range of the cup in each measuring area of ​​the cup is shown in Table 6.

[0059] Table 6 Range of elastic coefficient E of each measuring area of ​​the mold cup

[0060] Step 3, measuring the chest of the customer, establishing a digital human body model based on the measured human body data, and then intercepting the outer surface of the mold cup to obtain a personalized mold cup outer surface model.

[0061] Step 3.1, measure the chest circumference and underbust circumference of the customer, the chest circumference is 87.19cm, and the underbust circumference is 75.03cm; Step 3.2, use the virtual model editor tool in the CLO 3D software to change the chest size of the virtual model, and adjust the model's chest to the ideal state, position and height according to the needs of the customizer; Step 3.3, in the UG software, intercept the surface of the human chest model as the outer surface of the mold cup model, construct a complete mold cup contour line, intercept the surface within the contour line, and obtain the surface on the outer surface of the mold cup.

[0062] Step 4, import the mold cup outer surface model into the UG environment, mark the positions of the 8 measurement points on the outer surface model, construct the characteristic curve of the mold cup inner surface according to the displacement data of the 8 measurement points in Table 3 in step 2.3, and finally construct the mold cup inner surface model.

[0063] Step 5: Combine the inner and outer surfaces of the mold cup in the UG environment to complete the construction of the bra mold cup. Combine the inner and outer surface models of the mold cup that have been constructed in the same coordinate system to obtain a digital model of the bra mold cup.

[0064] Step 6: Step 6.1, select DLP printing method.

[0065] Step 6.2, select liquid elastic photosensitive resin material resione F80.

[0066] Step 7: Analyze and study the porous structure unit and make a preliminary selection. On this basis, set the value range for the variable parameters of the porous structure unit and design an orthogonal experiment.

[0067] Step 7.1, select the sample with X-type unit structure and mark it as A, the sample with tetrahedral unit structure and mark it as B, and the sample with pentagonal dodecahedron unit structure and mark it as C, as shown in Figure 4 (a)-Figure 4 (c), where Figure 4 (a) is an X-type unit structure, Figure 4 (b) is a tetrahedral unit structure, and Figure 4 (c) is a pentagonal dodecahedron structure.

[0068] Step 7.2, set the size of the cube to 8-22mm. Design the unit structure size range to 3-6mm. Set the unit structure diameter range to 0.8-1.2mm. Its unit structure parameters are shown in Figure 5 (a)-Figure 5 (c). Figure 5 (a) is the X-type unit structure parameter, Figure 5 (b) is the tetrahedron unit structure parameter, and Figure 5 (c) is the pentagonal dodecahedron structure parameter.

[0069] Step 7.3, the experiment uses the above parameter combinations to conduct compression elastic tests on the three unit structures, and designs a three-factor three-level orthogonal test, as shown in Table 7.

[0070] Table 7 Orthogonal experimental design table

[0071] Step 7.4, print out the sample according to the structural parameters in Table 7.

[0072] Step 8: Perform a compression elastic modulus test on the sample to obtain the elastic modulus. According to GB / T 1041-2008 Determination of the compression properties of plastics, use the UTM5504 universal testing machine to perform a compression elastic modulus test on the sample to obtain stress-strain data. According to the compression elastic modulus formula The elastic modulus is calculated.

[0073] Step 8.1, place the sample between the two pressure plates of the UTM5504 universal testing machine, so that the center line of the sample is consistent with the center line of the two pressure plates, and the two end faces of the sample should be parallel to the pressure plates. For the test of anisotropic materials, the compression force acts in the direction of future use and design. Adjust the height of the upper pressure plate so that it lightly touches the upper surface of the sample.

[0074] Step 8.2: Compress the sample along its main axis at a constant speed of 4 mm / min while keeping the sample quasi-static until the length of the sample is reduced by 60%.

[0075] Step 8.3, immediately maintain the quasi-static process of the sample and raise the upper pressing plate at a slow and uniform speed of 2 mm / min to the starting height of the upper pressing plate.

[0076] Step 8.4, plot the stress and strain data in an Excel spreadsheet to form a stress-strain curve, and obtain the slope of the elastic part of the curve, which is the elastic modulus E. The sorted elastic modulus is shown in Table 8.

[0077] Step 9: Perform an elastic recovery test on the sample according to GB / T 20671.2-2006 (Classification system and test methods for non-metallic gasket materials, Part 2: Compression rate and rebound rate test method for gasket materials) and calculate the elastic recovery rate.

[0078] Step 9.1, compress to the initial load Q1 state, and record the thickness P of the sample; Step 9.2, compress and apply the main load Q2 at a constant speed V, and record the specimen thickness M; Step 9.3, rebound to the initial load Q1 state, and record the rebound thickness R; Step 9.4: Execute steps 9.1 to 9.3 three times respectively and calculate the average of the three Ps. 、The average of the three M 、The average of the three Rs ; Step 9.5: Calculate the elastic rebound rate E1 of the sample according to the following formula (1): (1).

[0079] The elastic recovery results are shown in Table 8.

[0080] Table 8 Elastic modulus and elastic recovery rate of porous structure samples

[0081] Step 10, determine the porous structural unit and parameter settings for the final filling mold cup, and fill the mold cup with it to complete the construction of the gradient modulus mold cup. Table 6 shows that the elastic modulus range of each measurement area of ​​the mold cup is between 0.8-1.9, and the porous structures with elastic modulus within this range in Table 7 are A4, A9, B6, C6, C8, and C13. In order to ensure that the porous structures with different elastic moduli can be connected in order, a porous structural unit will eventually be selected to design the gradient modulus of the mold cup, and the tetrahedral porous structure (B) will not be considered. According to the elastic recovery rate value, the elastic recovery rates of C6 and C8 are relatively high, and are more suitable for the design of gradient modulus mold cups. The entire mold cup is filled with a pentagonal dodecahedron unit structure, and the upper cup is filled with a C8 porous structure with a unit size of 6×6×6mm and a rod diameter of 1.2mm; the mold cup is filled with a C6 porous structure with a unit size of 4.5×4.5×4.5mm and a rod diameter of 1.0mm; the middle area of ​​the mold cup is designed as a transition area to make the porous structure change smoothly. Figure 6 shown.

[0082] Step 11, add support to the mold cup model after gradient design. In order not to affect the performance of the porous structure, no printing support is added inside the porous structure. The support that needs to be added when printing the mold cup is as follows: Figure 7 As shown. Print according to the selected printing material and printing parameters, and perform post-processing such as cleaning and curing on the printed mold cup model. The printed mold cup structure, as shown Figure 8 shown.

[0083] 3D printing can build products of any complex shape. Combining 3D printing technology with personalized bra cup customization, the cup production process does not require a mold, and the material properties are most effectively utilized. This design and production model eliminates the intermediate process of cup mold production, greatly shortens the production cycle, and simplifies the bra cup production process. At the same time, because 3D printing technology does not require a one-time molding production method, it also greatly reduces customization costs. It can ensure that the cup is formed in one time and reduce the degree of environmental pollution.

[0084] 3D printed customized mold cups can also be designed and printed according to consumers' customized needs by analyzing the shaping mechanism of the mold cup on the chest, using anthropometric measurement and digital scanning methods to achieve a high degree of fit between the mold cup and the consumer's body characteristics, thereby enhancing the consumer's experience of the product.

Claims

1. A method for personalized customization of bra cups based on 3D printing technology, characterized in that: The specific steps include: Step 1, using a pressure measurement system to perform a molded cup bra wearing pressure experiment to obtain wearing pressure data of each target measurement point; Step 2, based on the data measured in step 1, calculate the elastic coefficient range of the material in each measuring area of ​​the bra cup mold; Step 3, determining the outer surface model of the mold cup; Step 4, constructing a curved surface model of the inner surface of the mold cup; Step 5, assembling the inner and outer surfaces of the mold cup to complete the construction of the bra mold cup model; Step 6, select printing method and printing materials; Step 7, select the printing structure; Step 8, performing a compression elastic modulus test on the sample to obtain the elastic modulus; Step 9, calculating the elastic recovery rate of the sample; Step 10, determining the porous structural units and parameters of the final filling mold cup, filling the mold cup to complete the construction of the mold cup with gradient modulus; Step 11: Print the mold cup to complete the customized mold cup production.

2. The method for personalized customization of bra cups based on 3D printing technology according to claim 1, characterized in that: The specific process of step 1 is as follows: Step 1.1, the entire cup is divided into an upper cup piece and a lower cup piece, the upper cup piece is divided into measurement area I; the lower cup piece is divided into measurement area II and measurement area III; Step 1.2, combining the diameter of the airbag of the pressure measurement system and the size of the inner surface of the mold cup, evenly select three measurement points in each measurement area, and select a total of eight measurement points represented by numbers 1-8; Step 1.3, the airbags of the pressure measurement system are glued and fixed to each measuring point of the mold cup bra bra1, and the customer wears the bra to perform a wearing pressure test to obtain the wearing pressure value F of each measuring point.

3. The method for personalized customization of bra cups based on 3D printing technology according to claim 2, characterized in that: The specific process of step 2 is: Step 2.1, select two bra cups that are exactly the same as those in step 1, mark them as bra2 and bra3 respectively, and use bra1, bra2, and bra3 as experimental objects; Step 2.2, align the measuring point of the mold cup with the airbag attached to the measuring point and place it on the measuring surface of the micrometer. After zeroing, turn the micrometer knob to increase the displacement by △L intervals. Observe until the pressure value of the pressure tester stabilizes, and record the pressure value △F at the displacement. Step 2.3, the compression amount of each measuring point when wearing the mold cup is included in the compression range of the elastic test, and the displacement range size is L; Step 2.4, import the experimental data into Excel, draw the pressure-displacement diagram of the three mold cups at each point, and calculate the data of each measurement point to fit the univariate linear equation y=ax+b, where x is the compression displacement value, y is the pressure value, b is the revised value, and the fitting equation coefficient a is the elastic coefficient E of the sponge material at the measurement point; Step 2.5, integrating the elastic coefficient into elastic coefficient intervals according to the three measurement areas of the mold cup upper piece, lower matching position, and side matching position, and obtaining the elastic coefficient range of the material in each measurement area of ​​the bra mold cup.

4. The method for personalized customization of bra cups based on 3D printing technology according to claim 3, characterized in that: In the step 6, the DLP printing method is selected; and the liquid elastic flexible photosensitive resin material resione F80 is selected.

5. The method for personalized customization of bra cup molds based on 3D printing technology according to claim 4, characterized in that: The specific process of step 8 is as follows: Step 8.1, place the sample between the two pressure plates of the UTM5504 universal testing machine, so that the center line of the sample is consistent with the center line of the two pressure plates. The two end faces of the sample should be parallel to the pressure plates. For the test of anisotropic materials, the compression force acts in the direction of future use and design. The height of the upper pressure plate is adjusted so that the upper pressure plate lightly touches the upper surface of the sample; Step 8.2, compress the sample along the main axis of the sample at a speed of v=0.02x until the length of the sample is reduced by 60%; where x is the side length of the cube and v is in mm / min; Step 8.3, raising the upper pressing plate to the starting height; Step 8.4, based on the experimentally measured stress σ and strain ε, draw a stress-strain curve based on the stress and strain data, and the slope of the curve is the compressive elastic modulus.

6. The method for personalized customization of bra cup molds based on 3D printing technology according to claim 5, characterized in that: The specific process of step 9 is as follows: Step 9.1, compress to the initial load Q1 state, and record the thickness P of the sample; Step 9.2, compress and apply the main load Q2 at a constant speed V, and record the specimen thickness M; Step 9.3, rebound to the initial load Q1 state, and record the rebound thickness R; Step 9.4: Execute steps 9.1 to 9.3 three times respectively and calculate the average of the three Ps. 、The average of the three M 、The average of the three Rs ; Step 9.5: Calculate the elastic rebound rate E1 of the sample according to the following formula (1): （1）。

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