CN114536604A - Flexible material based 3D printing sensor, preparation method and application - Google Patents
Flexible material based 3D printing sensor, preparation method and application Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 65
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 33
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- 229910052709 silver Inorganic materials 0.000 claims abstract description 6
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- 238000001035 drying Methods 0.000 claims abstract description 4
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- 238000000465 moulding Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 18
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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
-
- 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
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- 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
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
-
- 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
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/379—Handling of additively manufactured objects, e.g. using robots
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention relates to a preparation method of a 3D printing sensor based on a flexible material, which comprises the steps of designing a sensor model, printing a sensor conductive material appearance mold in a 3D mode through an insulating material which can be used for 3D printing, filling a mold cavity with a liquid conductive material for model verification and drying to obtain a prefabricated sensor, and performing model verification on the prefabricated sensor; the 3D integrated printing method includes the steps that a conductive material and an insulating material which can be used for 3D printing are integrally printed through a 3D printer according to a verified sensor model to obtain a sensor; and carrying out silver plating treatment on the terminal used for being connected with the outside on the conductive material of the sensor to obtain the final sensor. According to the invention, the sensor is manufactured in advance after the sensor model is designed, and the model verification is carried out on the sensor, so that the practical application feasibility of the sensor design can be estimated, and the production and processing precision of 3D integrated printing of the sensor is greatly improved.
Description
Technical Field
The invention relates to the technical field of materials and electronic sensing, in particular to a flexible material-based 3D printing sensor, a preparation method and application.
Background
Most of the current production and manufacturing of the sensor adopt metal and semiconductor materials, and the production of a large number of products has production and manufacturing standards; if the customer needs to customize, the scheme needs to be submitted to a processing company for non-standard production processing, and the customer cannot flexibly design and test own test samples, so that the research and development progress of related products is slowed down, and the project completion period is prolonged.
In order to solve the above problems, it has been proposed to fabricate the sensor by 3D printing, where 3D printing belongs to additive manufacturing technology, and is a technology for building a three-dimensional object by fusing liquid solidification or powder particles layer by layer under the control of a computer. In recent years, the printing ink is more and more widely commercialized and applied to the manufacturing of parts in the fields of buildings, automobiles, aerospace, medicine and the like, and the materials for 3D printing application mainly comprise metals, ceramics, composite materials, high polymer materials and the like. The sensor is manufactured by adopting a 3D printing mode in the prior art, the emphasis is mainly on the selection of printing materials, for example, the materials are selected from flexible materials, the flexible sensor technology is a development direction with great challenges and potentials, the flexible materials generally have the advantages of low elastic modulus, good stretchability and good conformal capability, the 3D printing technology realizes the forming flexibility, and the defects of long processing period and complex process of the traditional manufacturing method can be overcome when the flexible sensor is applied to the manufacturing process of the flexible sensor. However, in the prior art, the sensor is manufactured by 3D printing based on the flexible material, so that the verification link of the sensor model in the design stage is omitted, the practical application feasibility of the sensor design cannot be estimated, and the production and processing precision of the sensor manufactured by the 3D printing mode in the prior art is greatly limited.
Therefore, it is urgently needed to provide a 3D printing method for a sensor, which can predict the practical application feasibility of the sensor design so as to improve the production and processing precision.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problems in the prior art, and provide a flexible material based 3D printing sensor, a preparation method and application, wherein the flexible material and the conductive material are manufactured into an integrated sensor through a 3D printing mode based on the flexible material, and the integrated sensor has the characteristics of flexible, quick, simple and convenient graphic design and low cost.
In order to solve the technical problem, the invention provides a preparation method of a 3D printing sensor based on a flexible material, which comprises the following steps:
s10: designing a sensor model, printing a sensor conductive material appearance mold through insulating materials which can be used for 3D printing, filling a mold cavity with liquid conductive materials for model verification and drying to obtain a prefabricated sensor, and performing model verification on the prefabricated sensor, wherein the resistance value of the prefabricated sensor before deformation needs to be measured, and the resistance value meets the requirement that the Coefficient of Variation (CV) is less than or equal to 5%;
s20: the 3D integrated printing method includes the steps that a conductive material and an insulating material which can be used for 3D printing are integrally printed through a 3D printer according to a verified sensor model to obtain a sensor;
s30: and carrying out silver plating treatment on a terminal used for being connected with the outside on the conductive material of the sensor to obtain the final sensor.
In an embodiment of the present invention, in S10, when performing model verification on the prefabricated sensors, at least 8 prefabricated sensors are maximally deformed according to actual usage scenarios, and a resistance value of each prefabricated sensor after deformation is measured, where each prefabricated sensor needs to satisfy that a resistance value of the prefabricated sensor changes by more than or equal to 20% under a maximum deformation condition compared with a resistance value before deformation, and a variation coefficient CV of the resistance value of the prefabricated sensor under the maximum deformation condition compared with a difference value of the resistance values before deformation is less than or equal to 5%.
In an embodiment of the present invention, in S10, when performing model verification on the prefabricated sensors, after at least 8 prefabricated sensors are maximally deformed according to actual usage scenarios, the resistance change rate before testing and the resistance change difference Coefficient of Variation (CV) under the condition of releasing the applied force is less than or equal to 2%, and the resistance change difference Coefficient of Variation (CV) is less than or equal to 3%, and the requirements that after 3000 times of maximum deformation of each sensor is completed and the applied force is removed, the resistance change rate before testing is less than or equal to 3%, and the resistance change difference Coefficient of Variation (CV) is less than or equal to 5% are met.
In an embodiment of the present invention, in S10, when performing model verification on the prefabricated sensors, at least 8 prefabricated sensors are maximally deformed according to actual usage scenarios thereof, the magnitude of the force applied to the prefabricated sensors during the maximum deformation is recorded, the resistance values correspondingly measured by applying different magnitudes of force to the prefabricated sensors are respectively recorded, the resistance value of each prefabricated sensor and the pearson correlation coefficient of the force are calculated, and the absolute values of the resistance value of each prefabricated sensor and the pearson correlation coefficient of the force are all equal to or greater than 90%.
In one embodiment of the present invention, the recording of the measured resistances corresponding to the different amounts of force applied to the pre-fabrication sensor in S10 includes recording the measured resistances corresponding to the force applied to the pre-fabrication sensor being 0.
In one embodiment of the present invention, in S10, the liquid conductive material for model verification is conductive ink or conductive silver paste.
In one embodiment of the present invention, in S20, the conductive material is a conductive printing filament usable for 3D printing, and the conductive printing filament is a carbon fiber material or conductive ABS.
In one embodiment of the present invention, in S20, when the sensor is 3D integrally printed, the temperature and the printing speed of the 3D printing extruder for the conductive material and the insulating material are respectively adjusted to ensure that the integral molding of the conductive material and the insulating material is not layered.
In addition, the invention also provides a sensor which is prepared by the preparation method of the flexible material based 3D printing sensor.
In addition, the invention also provides application of the sensor prepared by the preparation method based on the flexible material 3D printing sensor in wearing sensing devices and touch panels.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the invention provides a preparation method of a 3D printing sensor based on a flexible material, which is characterized in that a sensor model is designed, a prefabricated sensor is prepared, and model verification is carried out on the sensor model, so that the feasibility of actual application of sensor design can be estimated, and the production and processing precision of 3D integrated printing of the sensor is greatly improved;
2. the invention provides a preparation method of a flexible material-based 3D printing sensor, which is characterized in that a flexible material and a conductive material are manufactured into an integrated sensor in a 3D printing mode based on the flexible material, and the integrated sensor has the characteristics of flexible, quick, simple and convenient graphic design and low cost;
3. the sensor prepared by the preparation method based on the flexible material 3D printing sensor has excellent performance, and can be widely applied to the fields of wearable sensing devices, touch panels and the like.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.
Fig. 1 is a schematic flow chart of a manufacturing method of a 3D printing sensor based on a flexible material according to the present invention.
FIG. 2 is a diagram of a conductive material outline mold in the sensor pattern dimension design and verification step of the present invention.
FIG. 3 is a profile view of a conductive material in a sensor of the present invention.
Fig. 4 is a sensor-equipped touch key of the present invention.
Fig. 5 is a miniature keyboard of the present invention equipped with 3 touch keys.
Fig. 6 is a schematic diagram of the sensor signal acquisition circuit connection of the present invention.
FIG. 7 is a schematic diagram of the touch key circuit connection of the present invention.
Wherein the reference numerals are as follows: 1. an insulating material; 2. a conductive material mold cavity; 3. a sensor terminal; 4. a touch key terminal; 5. miniature keyboard supporting seat.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example one
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides a method for manufacturing a flexible material based 3D printing sensor, including the following steps:
s10: designing a sensor model, printing a sensor conductive material appearance mold through insulating materials which can be used for 3D printing, filling a liquid conductive material for model verification into a conductive material mold cavity 2 and drying to obtain a prefabricated sensor, performing model verification on the prefabricated sensor, and measuring the resistance value of the plurality of prefabricated sensors before deformation during verification, wherein the resistance value satisfies that the coefficient of variation CV is less than or equal to 5%;
s20: the 3D integrated printing method includes the steps that the conductive material and the insulating material 1 which can be used for 3D printing are integrally printed through a 3D printer according to a verified sensor model to obtain a sensor;
s30: and carrying out silver plating treatment on a terminal used for being connected with the outside on the conductive material of the sensor to obtain the final sensor.
In the preparation method of the flexible material based 3D printing sensor disclosed by the embodiment of the invention, the flexible material and the conductive material are manufactured into the integrated sensor based on the flexible material in a 3D printing mode, and the integrated sensor has the characteristics of flexible, quick, simple and convenient graphic design and low cost.
In the preparation method of the flexible material based 3D printing sensor disclosed in the embodiment of the present invention, in S10 of the above embodiment, when performing model verification on the prefabricated sensor, it is preferable that at least 8 resistance values before deformation of the prefabricated sensor be measured, and the resistance values satisfy that the coefficient of variation CV is less than or equal to 5%.
In the method for manufacturing a 3D printing sensor based on a flexible material disclosed in the embodiment of the present invention, for S10 of the foregoing embodiment, when performing model verification on the prefabricated sensor, the prefabricated sensor designed according to the sensor model needs to satisfy conditions of resistance consistency, resistance change rate and Coefficient of Variation (CV) before and after maximum deformation, resistance change rate, Coefficient of Variation (CV) and fatigue characteristic under the condition of recovering the original shape after maximum deformation is released, and pearson correlation coefficient absolute value of resistance and force during the process of deforming to the maximum deformation amount not less than 90%, and determines whether the sensor model design satisfies the requirements by using the conditions as an index, so as to determine whether the sensor model needs to be further adjusted until determining the size of a sensor model graph that meets the above conditions.
For S10 of the foregoing embodiment, when performing model verification on the prefabricated sensors, at least 8 prefabricated sensors are maximally deformed according to actual usage scenarios, and a resistance value of each prefabricated sensor after deformation is measured, where each prefabricated sensor needs to satisfy that a resistance value under the maximum deformation condition changes by more than or equal to 20% compared with a resistance value before deformation, and a variation coefficient CV of a difference value of the resistance value under the maximum deformation condition compared with the resistance value before deformation is less than or equal to 5%.
For S10 of the foregoing embodiment, when performing model verification on the prefabricated sensors, after at least 8 prefabricated sensors are maximally deformed according to actual usage scenarios thereof, the rate of change of the resistance before and after testing is not greater than 2% and the coefficient of variation of difference of resistance (CV) is not greater than 3% under the condition of releasing the application force, and the requirements that after 3000 times of maximum deformation of each sensor are completed and the application force is removed, the rate of change of the resistance before and after testing is not greater than 3% and the coefficient of variation of difference of resistance (CV) is not greater than 5% are satisfied.
For S10 of the foregoing embodiment, when performing model verification on the prefabricated sensors, at least 8 prefabricated sensors are maximally deformed according to actual usage scenarios thereof, the magnitude of a force applied to the prefabricated sensors during the maximum deformation is recorded, resistance values correspondingly measured by applying different magnitudes of forces to the prefabricated sensors are respectively recorded, and the resistance value of each prefabricated sensor and the pearson correlation coefficient of the force are calculated, and the absolute values of the resistance value of each prefabricated sensor and the pearson correlation coefficient of the force are all equal to or greater than 90%. It should be noted that, when recording the resistance values corresponding to different forces applied to the prefabricated sensors, the recording of the resistance values corresponding to the forces applied to the prefabricated sensors is performed, including recording the resistance values corresponding to the forces applied to the prefabricated sensors as 0.
Specifically, at least 8 prefabricated sensors are subjected to maximum deformation according to actual use scenes, the magnitude G of force applied to the prefabricated sensors during maximum deformation is recorded, then resistance values corresponding to no force (namely, 0N) applied to the prefabricated sensors, 0.2G, 0.4G, 0.6G and 0.8G, G applied to the prefabricated sensors are recorded respectively, the resistance value of each prefabricated sensor and the Pearson correlation coefficient of the force are calculated respectively, and the absolute values of the resistance value of each prefabricated sensor and the Pearson correlation coefficient of the force are required to be more than or equal to 90%.
In the preparation method of the flexible material based 3D printing sensor disclosed in the embodiment of the present invention, for S10 in the above embodiment, the liquid conductive material used for model verification is conductive ink or conductive silver paste.
In the preparation method of the flexible material based 3D printing sensor disclosed in the embodiment of the present invention, as for S20 of the above embodiment, the conductive material in the sensor 3D integral printing step is a conductive printing filament that can be used for 3D printing, and may be a carbon fiber material or a conductive ABS.
In the preparation method of the flexible material based 3D printing sensor disclosed in the embodiment of the present invention, for S20 in the above embodiment, the insulating material is a flexible material that can be used for 3D printing, and the size of the flexible material in the step of 3D integrated printing of the sensor needs to meet the requirement that the sensor immediately recovers the original external size after the external force is removed, so that the problem of failure and deformation does not occur.
In the preparation method of the flexible material based 3D printing sensor disclosed in the embodiment of the present invention, for S20 in the above embodiment, when the sensor is used for 3D integral printing, the temperature and the printing speed of the 3D printing extruder for conductive materials and insulating materials are respectively adjusted to ensure that the conductive materials and the insulating materials are integrally formed without delamination, thereby ensuring the consistency of deformation.
In the preparation method of the flexible material based 3D printing sensor disclosed in the embodiment of the present invention, in S30 of the above embodiment, the step of silver plating the terminal for connection with an external circuit on the conductive material of the sensor refers to the step of silver plating the sensor terminal 3.
In the preparation method of the 3D printing sensor based on the flexible material, disclosed by the embodiment of the invention, the sensor is prepared in advance after a sensor model is designed, and model verification is carried out on the sensor, so that the practical application feasibility of sensor design can be estimated, and the production and processing precision of 3D integrated printing of the sensor is greatly improved.
Example two
Corresponding to the embodiment of the method, a second embodiment of the present invention provides a sensor, which is manufactured by using the manufacturing method of the flexible material based 3D printing sensor according to the first embodiment, and the manufacturing method of the flexible material based 3D printing sensor has been elaborated in the first embodiment, and this embodiment is not described herein again.
In the sensor disclosed by the embodiment of the invention, the sensor prepared by the preparation method based on the flexible material 3D printing sensor has excellent performance, and can be widely applied to the fields of wearable sensing devices, touch panels and the like.
In the sensor disclosed in the embodiment of the invention, when the sensor manufactured by the manufacturing method based on the flexible material 3D printing sensor is manufactured, the flexible material and the conductive material are manufactured into the integrated sensor based on the flexible material in a 3D printing mode, so that the sensor has the characteristics of flexible, quick, simple and convenient graphic design and low cost, and particularly, the prefabricated sensor is manufactured after a sensor model is designed and is subjected to model verification, so that the practical application feasibility of the sensor design can be estimated, and the production and processing precision of the 3D integrated printing of the sensor is greatly improved.
In the sensor disclosed in the embodiment of the invention, when the sensor manufactured by the preparation method based on the flexible material 3D printing sensor is used, the resistance range before and after the deformation of the conductive material of the sensor and the corresponding relation between the resistance and the applied force are predicted according to the using scene of the sensor, the sensor is used as one resistance access circuit of a wheatstone bridge according to the wheatstone bridge principle, as shown in fig. 6, Rx represents the resistance of the sensor, a voltage excitation signal is provided for the circuit through a digital interface of a controller, and a voltage signal at the end of the sensor is acquired and calculated through a pair of analog input ports of the controller.
EXAMPLE III
Corresponding to the embodiment of the method, the third embodiment of the present invention provides an application of the sensor manufactured by the method for manufacturing a 3D printing sensor based on a flexible material in wearing a sensing device and a touch pad, and the method for manufacturing a 3D printing sensor based on a flexible material has been elaborated in the first embodiment, and is not repeated herein.
Taking the use of the touch key of the sensor as an example, fig. 3 is an outline diagram of a conductive material after the design and verification of a sensor model, the design of the touch key containing the conductive material is shown in fig. 4, wherein a touch key terminal 4 is used for accessing a signal acquisition circuit, as shown in fig. 7, and Rx represents a single touch key resistor; using commercial conductive wires of MatterHackers as conductive materials, using NINJAFLEX as flexible insulating materials 1, integrally printing 3 touch keys through a 3D printer, then using PLA materials to print a miniature keyboard supporting seat 5 in a 3D mode, and respectively installing the 3 touch keys at corresponding positions of the miniature keyboard supporting seat 5 to form a miniature control keyboard, as shown in FIG. 5; vout varies with the deformation of the touch key, and its magnitude is calculated as follows:
the controller can control the corresponding buzzer to emit sounds with different frequencies according to different values of Vout, so that the micro control keyboard with 3 touch keys can respectively control 3 buzzers, and the micro control keyboard can be used for alarm triggering, music composition and other applications.
In the application of the sensor disclosed by the embodiment of the invention, the sensor prepared by the preparation method based on the flexible material 3D printing sensor has excellent performance, and can be widely applied to the fields of wearable sensing devices, touch panels and the like.
In the application of the sensor disclosed by the embodiment of the invention, when the sensor manufactured by the manufacturing method based on the flexible material 3D printing sensor is manufactured, the flexible material and the conductive material are manufactured into the integrated sensor based on the flexible material in a 3D printing mode, the integrated sensor has the characteristics of flexible, quick, simple and convenient graphic design and low cost, and particularly, the prefabricated sensor is manufactured after a sensor model is designed and subjected to model verification so as to estimate the practical application feasibility of the sensor design, thereby greatly improving the production and processing precision of the 3D integrated printing of the sensor.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A preparation method of a 3D printing sensor based on a flexible material is characterized by comprising the following steps:
s10: designing a sensor model, printing a sensor conductive material appearance mold through insulating materials which can be used for 3D printing, filling a mold cavity with liquid conductive materials for model verification and drying to obtain prefabricated sensors, performing model verification on the prefabricated sensors, and measuring resistance values of at least 8 prefabricated sensors before deformation, wherein the resistance values meet that the coefficient of variation CV is less than or equal to 5%;
s20: the 3D integrated printing method includes the steps that a conductive material and an insulating material which can be used for 3D printing are integrally printed through a 3D printer according to a verified sensor model to obtain a sensor;
s30: and carrying out silver plating treatment on a terminal used for being connected with the outside on the conductive material of the sensor to obtain the final sensor.
2. The manufacturing method of the flexible material based 3D printing sensor according to claim 1, characterized in that: in S10, when performing model verification on the prefabricated sensors, at least 8 prefabricated sensors are maximally deformed according to actual usage scenarios, and the resistance value of each prefabricated sensor after deformation is measured, where each prefabricated sensor needs to satisfy that the resistance value of the prefabricated sensor changes by more than or equal to 20% under the maximum deformation condition compared with the resistance value before deformation, and the coefficient of variation CV of the resistance value of the prefabricated sensor under the maximum deformation condition compared with the difference value of the resistance values before deformation is less than or equal to 5%.
3. The manufacturing method of the flexible material based 3D printing sensor according to claim 1, characterized in that: in S10, when performing model verification on the prefabricated sensors, after at least 8 prefabricated sensors are maximally deformed according to actual use scenarios, the change rate of the resistance before testing and the change rate of the resistance difference (CV) before testing are not greater than 2% under the applied force condition, and the difference Coefficient of Variation (CV) of the resistance change is not greater than 3%, and the requirements that after 3000 times of maximum deformation of each sensor is completed and the applied force is removed, the change rate of the resistance before testing is not greater than 3%, and the change rate of the resistance difference (CV) is not greater than 5% are met.
4. The manufacturing method of the flexible material based 3D printing sensor according to claim 1, characterized in that: in S10, when performing model verification on the prefabricated sensors, at least 8 prefabricated sensors are maximally deformed according to actual usage scenarios, the magnitude of a force applied to the prefabricated sensors during maximum deformation is recorded, resistance values correspondingly measured by applying different magnitudes of forces to the prefabricated sensors are recorded, and the resistance value of each prefabricated sensor and the pearson correlation coefficient of the force are calculated, and the absolute value of the resistance value of each prefabricated sensor and the pearson correlation coefficient of the force is equal to or greater than 90%.
5. The manufacturing method of the flexible material based 3D printing sensor according to claim 4, wherein: in S10, the recording of the measured resistance values corresponding to the different amounts of force applied to the premanufactured sensor includes recording the measured resistance values corresponding to the force applied to the premanufactured sensor being 0.
6. The manufacturing method of the flexible material based 3D printing sensor according to claim 1, characterized in that: in S10, the liquid conductive material used for model verification is conductive ink or conductive silver paste.
7. The manufacturing method of the flexible material based 3D printing sensor according to claim 1, characterized in that: in S20, the conductive material is a conductive printing filament that can be used for 3D printing, and the conductive printing filament is a carbon fiber material or conductive ABS.
8. The manufacturing method of the flexible material based 3D printing sensor according to claim 1, characterized in that: in S20, when the sensor is subjected to 3D integral printing, the temperature and the printing speed of the 3D printing extruder of the conductive material and the insulating material are respectively adjusted to ensure that the integral molding of the conductive material and the insulating material is not layered.
9. A sensor, characterized by: the flexible material based 3D printing sensor is prepared by the preparation method of any one of claims 1 to 8.
10. Use of the sensor prepared by the preparation method of the flexible material based 3D printing sensor according to any one of claims 1-8 in wearing of sensing devices and touch panels.
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