CN114248446A - Method for improving three-dimensional forming strength of biological material - Google Patents

Method for improving three-dimensional forming strength of biological material Download PDF

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Publication number
CN114248446A
CN114248446A CN202111564149.9A CN202111564149A CN114248446A CN 114248446 A CN114248446 A CN 114248446A CN 202111564149 A CN202111564149 A CN 202111564149A CN 114248446 A CN114248446 A CN 114248446A
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cavity
axis
biological material
flat
layer
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冯博华
蔡永铭
刘世俊
阮萍
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Guangdong Pharmaceutical University
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Guangdong Pharmaceutical University
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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
    • 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
    • B29C64/386—Data acquisition or data processing for 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
    • B29C64/10—Processes of additive manufacturing
    • B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
    • B29C64/112—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using individual droplets, e.g. from jetting heads
    • 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
    • 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
    • B33Y50/00—Data acquisition or data processing for additive manufacturing

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

The invention relates to a method for improving the three-dimensional forming strength of a biological material, which comprises the following steps: the method comprises the following steps: setting parameters of the 3D printer; inputting a file of a three-dimensional model of the biological material; step two: cutting the model into n flat layers on average; step three: in the process of establishing the biological material three-dimensional model, in the adjacent continuous D flat layers, each flat layer generates KnA plurality of interconnected cavities; step four: printing according to the established three-dimensional model; and judging when the position of the hole is reached in the process of printing the nth flat layer, and if the sum of the depth of the hole and the depth of the hole of the previous (D-1) layer is more than D x H, filling the hole with a material. When the three-dimensional model is printed, not only the three-dimensional model is printedHorizontal printing forms the flat bed to vertically printing forms the strengthening rib in adjacent continuous D flat beds, having strengthened the bonding between the adjacent flat bed strong and the bulk strength of three-dimensional model, make the three-dimensional model that uses biomaterial to print stack the shaping more easily.

Description

Method for improving three-dimensional forming strength of biological material
Technical Field
The invention relates to the technical field of material forming, in particular to a method capable of improving the three-dimensional forming strength of a biological material.
Background
The existing three-dimensional molding of biological materials generally has a disadvantage that the strength is too poor and the stacking molding is difficult. Generally, in order to improve the strength, some biological or chemical methods are used for improvement, such as adding a photosensitive curing agent and a temperature-sensitive curing agent, but the method has the disadvantages of destroying the characteristics of the original biological material and increasing the complexity of the material.
One of the existing methods of the biological hydrogel is 3D printing, in a certain direction, a three-dimensional model is subdivided into printable thicknesses by using enough slices, all contour information of the intersection of the slices and the model on each layer is obtained, and a printing path is calculated; the model is reconstructed by building up the bond (curing) of the printed material layer by layer according to the printing path. However, in the conventional flat-layer printing of the cut sheet, the bonding strength between layers is low, which results in low strength of the formed object. Therefore, in order to increase the bonding strength between layers in the existing method, the sine curved surface is formed into a sliced curved surface, the unique uniformly distributed peak-valley distribution greatly increases the contact surface between adjacent layers, and the strength of an object obtained by 3D printing is increased on the premise of not changing the cohesiveness of the material.
However, in the above-mentioned solution, the strength that can be increased by merely increasing the contact area between adjacent layers is limited, and particularly, when the number of layers is increased, there is no adhesion between non-adjacent curved layers, so that the strength of the whole three-dimensional molded object is affected as long as there is actually two adjacent curved layers that are adhered, and the object may be damaged as two adjacent curved layers are broken. Therefore, the strength of the object as a whole is still not high enough.
Disclosure of Invention
The invention aims to overcome the problem of insufficient strength of the material after three-dimensional forming in the prior art, and provides a method for improving the three-dimensional forming strength of a biological material, which can connect non-adjacent sliced layers and increase the strength of the material after three-dimensional forming.
In order to solve the technical problems, the invention adopts the technical scheme that: a method capable of improving the three-dimensional forming strength of a biological material adopts a 3D printing mode and specifically comprises the following steps:
the method comprises the following steps: setting parameters of the 3D printer; inputting a file of the three-dimensional model of the biological material to obtain the height H of the three-dimensional model of the biological material;
step two: and (3) according to the height H and setting the height H of each layer, averagely cutting the model into n flat layers: n is H/H;
step three: in the process of establishing a three-dimensional model of the biological material, K interconnected cavities are generated in each flat layer in adjacent continuous D flat layers;
step four: printing according to the three-dimensional model of the biological material established in the step three; judging when the position of the hole is reached in the process of printing the nth flat layer, if the sum of the depth of the hole and the depth of the hole of the previous (D-1) layer is more than D x H, filling the material into the hole until all the holes connected with the hole are filled; if the sum of the depth of the cavity and the depth of the cavity of the front (D-1) layer is less than D, automatically skipping the cavity and then continuously tiling and discharging; the above printing process is repeated for each layer until printing is completed.
In the technical scheme, after the three-dimensional model of the biological material is printed, the biological material filled in the cavity is equivalent to form the reinforcing ribs in the Z-axis direction, so that the interior of the three-dimensional model of the biological material is staggered in the longitudinal direction and the transverse direction, and the tensile strength of the three-dimensional model of the biological material after the three-dimensional model of the biological material is subjected to horizontal acting force in the Z-axis direction is enhanced. And because the model is connected at D adjacent continuous flat layers through the reinforcing ribs, the connection between two adjacent flat layers is not only the connection between the two adjacent flat layers, but also the connection between the two adjacent flat layers, and the great influence on the overall strength of the model due to the change of the connection strength between the two adjacent flat layers can be avoided, thereby improving the overall strength of the model.
Preferably, K is calculated specifically as follows:
Figure BDA0003421415910000021
Mn＝Vn*ρ
in the formula, MnMass of the nth flat layer; vnIs the volume of the nth flat layer; q is the tensile strength of the biomaterial; ρ is the density of the biomaterial; and the Kn is an integer upwards.
The value of D can be set as required, Q is the tensile strength of the biomaterial under the diameter of the cavity, and based on the total mass of the adjacent continuous D flat layers, the sufficient tensile strength of all the cavities of the group of D flat layers after the filling is finished is ensured, and the reinforcing ribs generated in the cavities can ensure the stable shape of the model.
Preferably, the cavities are uniformly distributed on each flat layer, and the distance between the cavities is J; the space between the cavities in the X-axis direction is JxAnd the space between the holes in the Y-axis direction is Jy/2. The reinforcing ribs formed after the holes are uniformly distributed, namely, the reinforcing ribs are uniformly distributed on the flat layer, so that the tensile resistance brought by the reinforcing ribs cannot be too concentrated, the stress distribution inside the model is more uniform, and better strength is obtained.
Preferably, in the third step, in the process of generating the hole of the nth flat layer, whether the hole is communicated with the hole of the (n-1) th layer is judged, and if not, an enhancement cavity with the length dx or dy is generated in the direction of the X axis and/or the Y axis of the hole respectively; the length dx or dy of the enhancement cavity is less than the distance of the cavity to the edge of the flat layer. Because 3D prints and lets the material bonding form a flat bed behind the material through printing the strip, also can not take place relative position and lead to the scheduling problem of fracture between the bonding inefficacy between the different strip materials between the inside of also being the flat bed, and through the effect in reinforcing chamber, strengthen the filling in chamber simultaneously when filling the hole, form the connecting portion of connecting different strip materials in the reinforcing chamber, increase the joint strength between the different strip materials, increase every flat bed intensity. And set up the reinforcing chamber in strip material extrusion moulding's direction, the connecting portion that forms after this reinforcing chamber is filled can receive the restriction of one deck flat bed on it to increase the joint strength of strengthening rib and connecting portion and flat bed, avoid taking place to peel off or loosen scheduling problem between strengthening rib and the connecting portion.
In order to avoid that the reinforcement cavity penetrates the outer surface of the mould and causes the structure of the mould to be damaged, the length of the reinforcement cavity is smaller than the distance between the edges of the flat layer of the cavity
Preferably, the length dx of the reinforcement cavity in the direction of the X-axis is less than Jx/2; the length dy of the enhancement cavity in the Y-axis direction is less than Jy/2; if the length of the enhancement cavity is not limited, the enhancement cavities of different cavities may or may not be communicated, so that controllable parameters such as filling amount or time are difficult to estimate during filling, the amount is less, gaps exist in the enhancement cavities or the cavities, the amount is more, overflow is caused, printing is influenced, and finally the strength of the model is influenced.
Preferably, the length dx and/or dy of the enhancement cavity is a preset fixed value, and if the fixed value is smaller than the distance from the corresponding hole to the edge of the flat layer in any direction of the X axis or the Y axis or Jx/2 or Jy/2 is large, the enhancement cavity is generated in the direction of the X axis or the Y axis; otherwise, no enhancement cavity is generated in the X-axis or Y-axis direction. In order to reduce the calculation amount, the length of the enhancement cavity is preset as a fixed value, when the enhancement cavity is generated, the positive and negative directions of an X axis and the positive and negative directions of a Y axis are respectively judged, and in the directions, if the fixed value is smaller than the distance to the edge of a flat layer or smaller than Jx/2 or Jy/2, the enhancement cavity is generated, so that the enhancement cavities are ensured not to be communicated and not to break through the outer surface of a model, the calculation of the length of the enhancement cavity is omitted, and the judgment and comparison of the size of the numerical value are only needed.
Preferably, the area of the cavity is larger than the area of the discharge port of the printer. The discharge port of the printer is the discharge port of the spray head, and the general discharge port is a round point. The smallest cavity area is therefore the area of the outlet. In order to prevent blockage in the filling process, the area of the generated cavity is larger than that of the discharge hole, so that the cavity can more easily flow to the bottom and enter the reinforcing cavity when the biological material is filled. If the cavity is arranged on the same strip-shaped material, the width of the cavity is the diameter of the discharge hole, and the length of the cavity is larger than the diameter of the discharge hole. If the cavity spans several different strips, the diameter of the cavity is larger than the diameter of the discharge opening.
Preferably, the cross-sectional area of the intensification chamber is greater than the area of the cavity in communication therewith. The thickness of the reinforcement cavity is the thickness of the flat layer. During the process of filling the biomaterial, the large cross-sectional area of the reinforcing cavity enables the biomaterial to flow into the reinforcing cavity from the cavity more easily, and the blockage is not easy to cause.
Preferably, in the fourth step, in the filling process of the cavity, a filling time T is set, and the filling time T is the volume of the reinforcing cavity and all cavities multiplied by the flow rate of the discharge port of the printer. And glue is discharged all the time within the time T, the cavity and the reinforcing cavity are filled with the biological material, and no gap is left in the cavity.
Preferably, in the step one, a printing height threshold, a gradient threshold, a thickness threshold and a speed threshold of the 3D printer are set. The height of the target model exceeding the height threshold reduces the printing speed and decreases the flow of the biological material. The inclination of the target model exceeding the inclination threshold reduces the printing speed and the flow rate of the biomaterial. If the target model thickness is less than the thickness threshold, the printing speed is reduced and the flow of biological material is reduced. The speed threshold is set for different biological materials, and the speed which does not exceed the threshold after the setting is finished serves as a safe speed for printing.
Compared with the prior art, the beneficial effects are: when the three-dimensional model is printed, not only the flat layers are formed by transverse printing, but also the reinforcing ribs are formed by longitudinal printing in the adjacent continuous D flat layers, so that the bonding strength between the adjacent flat layers and the overall strength of the three-dimensional model are enhanced, and the three-dimensional model printed by using the biological material is easier to stack and form.
Drawings
FIG. 1 is a flow chart of a method of the present invention for improving the stereoforming strength of a biomaterial;
FIG. 2 is a schematic cross-sectional view in the Y-axis direction of a three-dimensional model after the method of example 1 is used;
FIG. 3 is a schematic cross-sectional view in the X-axis direction of a three-dimensional model after the method of example 1 is used;
FIG. 4 is a schematic cross-sectional view in the Y-axis direction of a three-dimensional model after the method of example 2 is used;
fig. 5 is a schematic cross-sectional view in the X-axis direction of a solid model after the method of example 2 is used.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1
Fig. 1 shows an embodiment of a method for improving the three-dimensional forming strength of a biomaterial, which adopts a 3D printing method, and specifically includes the following steps:
the method comprises the following steps: setting parameters of the 3D printer; inputting a file of the three-dimensional model of the biological material to obtain the height H of the three-dimensional model of the biological material;
step two: and (3) according to the height H and setting the height H of each layer, averagely cutting the model into n flat layers: n is H/H;
step three: in the process of establishing a three-dimensional model of the biological material, K interconnected cavities are generated in each flat layer in adjacent continuous D flat layers; preferably, K is calculated specifically as follows:
Figure BDA0003421415910000051
Mn＝Vn*ρ
in the formula, MnMass of the nth flat layer; vnIs the volume of the nth flat layer; q is the tensile strength of the biomaterial; ρ is the density of the biomaterial; and the Kn is an integer upwards.
The value of D may be set as required, and in this embodiment, the value of D is 3; q is the tensile strength of the biomaterial under the diameter of the cavity, and based on the total mass in the adjacent continuous D flat layers, the sufficient tensile strength of all the cavities in the group of D flat layers after the filling is finished is ensured, and the reinforcing ribs generated in the cavities can ensure the stable shape of the model.
Step four: printing according to the three-dimensional model of the biological material established in the step three; judging when the position of the hole is reached in the process of printing the nth flat layer, if the sum of the depth of the hole and the depth of the hole of the previous (D-1) layer is more than D x H, filling the material into the hole until all the holes connected with the hole are filled; if the sum of the depth of the cavity and the depth of the cavity of the front (D-1) layer is less than D, automatically skipping the cavity and then continuously tiling and discharging; the above printing process is repeated for each layer until printing is completed.
The working principle or working process of the embodiment is as follows: after the three-dimensional model of the biological material is printed, as shown in fig. 1-2, 1 is a flat layer formed by flat printing, and the biological material filled in the cavity is equivalent to form a reinforcing rib 2 in the direction of the Z axis, so that the interior of the three-dimensional model of the biological material is staggered in the longitudinal direction and the transverse direction, and the tensile strength of the three-dimensional model of the biological material after the three-dimensional model of the biological material is subjected to horizontal acting force in the direction of the Z axis is enhanced. And because the model is connected at D adjacent continuous flat layers through the reinforcing ribs, the connection between two adjacent flat layers is not only the connection between the two adjacent flat layers, but also the connection between the two adjacent flat layers, and the great influence on the overall strength of the model due to the change of the connection strength between the two adjacent flat layers can be avoided, thereby improving the overall strength of the model.
The beneficial effects of this embodiment: when the three-dimensional model is printed, not only the flat layers are formed by transverse printing, but also the reinforcing ribs are formed by longitudinal printing in the adjacent continuous D flat layers, so that the bonding strength between the adjacent flat layers and the overall strength of the three-dimensional model are enhanced, and the three-dimensional model printed by using the biological material is easier to stack and form.
Example 2
Based on example 1, the method for improving the stereoforming strength of the biomaterial is further defined as follows:
when the holes are generated, the holes are uniformly distributed on each flat layer, and the distance between the holes is J; the space between the cavities in the X-axis direction is JxAnd the space between the holes in the Y-axis direction is Jy/2. The reinforcing ribs formed after the holes are uniformly distributed, namely, the reinforcing ribs are uniformly distributed on the flat layer, so that the tensile resistance brought by the reinforcing ribs cannot be too concentrated, the stress distribution inside the model is more uniform, and better strength is obtained.
In the process of generating the hole of the nth flat layer, judging whether the hole is communicated with the hole of the (n-1) th layer, if not, respectively generating an enhanced cavity with the length of dx or dy in the X-axis and/or Y-axis direction of the hole; the length dx or dy of the enhancement cavity is less than the distance of the cavity to the edge of the flat layer. Because 3D prints and lets the material bond thereby form a flat bed behind the strip material of printing, in this embodiment, the shower nozzle of printer prints the strip material along Y axle direction, and after a strip material accomplished to print in the direction of Y axle, the shower nozzle moved to X axle direction and then continued the printing of Y axle direction to the tiling forms a flat bed. That is, the bonding failure between different strip-shaped materials also occurs at relative positions between the interiors of the flat layers, so that the problems of cracking and the like are caused, and through the action of the reinforcing cavities, as shown in fig. 4 to 5, when the cavity is filled to form the reinforcing rib 2, the reinforcing cavities are filled simultaneously to form the connecting parts 3, the connecting parts 3 for connecting different strip-shaped materials are formed in the reinforcing cavities in the X-axis direction, so that the connecting strength between different strip-shaped materials is increased, and the strength of each flat layer is increased. And set up the reinforcing chamber in the direction of Y axle, connecting portion 3 that forms after this reinforcing chamber is filled can receive the restriction of one deck flat bed on it to increase the joint strength of strengthening rib and connecting portion and flat bed, avoid taking place to peel off or take off scheduling problem between strengthening rib and the connecting portion.
In order to avoid that the reinforcement cavity penetrates the outer surface of the mould and the structure of the mould is destroyed, the length of the reinforcement cavity is smaller than the distance between the edges of the flat layer of the cavity.
Further, the length dx of the reinforcement cavity in the X-axis direction is less than Jx/2; the length dy of the enhancement cavity in the Y-axis direction is less than Jy/2; if the length of the enhancement cavity is not limited, the enhancement cavities of different cavities may or may not be communicated, so that controllable parameters such as filling amount or time are difficult to estimate during filling, the amount is less, gaps exist in the enhancement cavities or the cavities, the amount is more, overflow is caused, printing is influenced, and finally the strength of the model is influenced. Fig. 4-5 are schematic cross-sectional views of the printed three-dimensional model.
Specifically, the area of the cavity is larger than the area of the discharge port of the printer. The discharge port of the printer is the discharge port of the spray head, and the general discharge port is a round point. The smallest cavity area is therefore the area of the outlet. In order to prevent blockage in the filling process, the area of the generated cavity is larger than that of the discharge hole, so that the cavity can more easily flow to the bottom and enter the reinforcing cavity when the biological material is filled. If the cavity is arranged on the same strip-shaped material, the width of the cavity is the diameter of the discharge hole, and the length of the cavity is larger than the diameter of the discharge hole. If the cavity spans several different strips, the diameter of the cavity is larger than the diameter of the discharge opening. The cross-sectional area of the intensification chamber is greater than the area of the cavity in communication therewith. The thickness of the reinforcement cavity is the thickness of the flat layer. During the process of filling the biomaterial, the large cross-sectional area of the reinforcing cavity enables the biomaterial to flow into the reinforcing cavity from the cavity more easily, and the blockage is not easy to cause. In the fourth step, in the process of filling the cavity, the filling time T is set, and the time T is the volume of the reinforcing cavity and all cavities multiplied by the flow rate of the discharge port of the printer. And glue is discharged all the time within the time T, the cavity and the reinforcing cavity are filled with the biological material, and no gap is left in the cavity.
The remaining features and operating principle of this embodiment are consistent with embodiment 1.
Example 3
Example 3 of a method for improving the stereoforming strength of a biomaterial, based on example 1, the third step is further defined on the basis of example 1, specifically:
when the holes are generated, the holes are uniformly distributed on each flat layer, and the distance between the holes is J; the space between the cavities in the X-axis direction is JxAnd the space between the holes in the Y-axis direction is Jy/2. The reinforcing ribs formed after the holes are uniformly distributed, namely, the reinforcing ribs are uniformly distributed on the flat layer, so that the tensile resistance brought by the reinforcing ribs cannot be too concentrated, the stress distribution inside the model is more uniform, and better strength is obtained.
In the process of generating the hole of the nth flat layer, judging whether the hole is communicated with the hole of the (n-1) th layer, if not, respectively generating an enhanced cavity with the length of dx or dy in the X-axis and/or Y-axis direction of the hole; the length dx or dy of the enhancement cavity is less than the distance of the cavity to the edge of the flat layer. Because 3D prints and lets the material bonding form a flat bed behind the material through printing the strip, also can not take place relative position and lead to the scheduling problem of fracture between the bonding inefficacy between the different strip materials between the inside of also being the flat bed, and through the effect in reinforcing chamber, strengthen the filling in chamber simultaneously when filling the hole, form the connecting portion of connecting different strip materials in the reinforcing chamber, increase the joint strength between the different strip materials, increase every flat bed intensity. And set up the reinforcing chamber in strip material extrusion moulding's direction, the connecting portion that forms after this reinforcing chamber is filled can receive the restriction of one deck flat bed on it to increase the joint strength of strengthening rib and connecting portion and flat bed, avoid taking place to peel off or loosen scheduling problem between strengthening rib and the connecting portion.
The length dx and/or dy of the enhancement cavity is a preset fixed value, and if the fixed value is smaller than the distance from the corresponding hole to the edge of the flat layer in any direction of the X axis or the Y axis or Jx/2 or Jy/2 is large, the enhancement cavity is generated in the direction of the X axis or the Y axis; otherwise, no enhancement cavity is generated in the X-axis or Y-axis direction. In order to reduce the calculation amount, the length of the enhancement cavity is preset as a fixed value, when the enhancement cavity is generated, the positive and negative directions of an X axis and the positive and negative directions of a Y axis are respectively judged, and in the directions, if the fixed value is smaller than the distance to the edge of a flat layer or smaller than Jx/2 or Jy/2, the enhancement cavity is generated, so that the enhancement cavities are ensured not to be communicated and not to break through the outer surface of a model, the calculation of the length of the enhancement cavity is omitted, and the judgment and comparison of the size of the numerical value are only needed. If the X axis and the Y axis generate the enhanced cavity, a cavity body in a cross shape is generated; if the positive and negative directions of the X axis generate the enhanced cavity, but the positive and negative directions of the Y axis do not generate the enhanced cavity, an inverted T-shaped hole is generated; if the positive and negative directions of the Y axis generate the enhanced cavity, but the positive and negative directions of the X axis do not generate the enhanced cavity, an inverted T-shaped hole is generated; if the positive direction or the negative direction of the X axis generates the enhancement cavity, but the other direction of the X axis and the positive and negative directions of the Y axis do not generate the enhancement cavity, an L-shaped hole shape is generated; if the enhancement cavity is generated in the positive direction or the negative direction of the Y axis, but the enhancement cavity is not generated in the other direction of the Y axis and the positive and negative directions of the X axis, an L-shaped hole shape is generated;
the remaining features and operating principle of this embodiment are consistent with embodiment 1.
Example 4
Embodiment 4 of a method for improving the stereoforming strength of a biomaterial, based on any of the above embodiments, further limiting the first step, specifically: in step one, a printing height threshold, an inclination threshold, a thickness threshold and a speed threshold of the 3D printer are set. The height of the target model exceeding the height threshold reduces the printing speed and decreases the flow of the biological material. The inclination of the target model exceeding the inclination threshold reduces the printing speed and the flow rate of the biomaterial. If the target model thickness is less than the thickness threshold, the printing speed is reduced and the flow of biological material is reduced. The speed threshold is set for different biological materials, and the speed which does not exceed the threshold after the setting is finished serves as a safe speed for printing.
The remaining features and principles of operation of this embodiment are consistent with any of the embodiments described above.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. 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. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A method capable of improving the three-dimensional forming strength of a biological material is characterized in that a 3D printing mode is adopted, and the method specifically comprises the following steps:
the method comprises the following steps: setting parameters of the 3D printer; inputting a file of the three-dimensional model of the biological material to obtain the height H of the three-dimensional model of the biological material;
step two: and (3) according to the height H and setting the height H of each layer, averagely cutting the model into n flat layers: n is H/H;
step three: in the process of establishing the biological material three-dimensional model, in the adjacent continuous D flat layers, each flat layer generates KnA plurality of interconnected cavities;
step four: printing according to the three-dimensional model of the biological material established in the step three; judging when the position of the hole is reached in the process of printing the nth flat layer, if the sum of the depth of the hole and the depth of the hole of the previous (D-1) layer is more than D x H, filling the material into the hole until all the holes connected with the hole are filled; if the sum of the depth of the cavity and the depth of the cavity of the front (D-1) layer is less than D, automatically skipping the cavity and then continuously tiling and discharging; the above printing process is repeated for each layer until printing is completed.
2. The method for improving the stereogenic strength of a biological material according to claim 1, wherein KN is calculated as follows:
Figure FDA0003421415900000011
Mn＝Vn*ρ
in the formula, MnMass of the nth flat layer; vnIs the volume of the nth flat layer; q is the tensile strength of the biomaterial; ρ is the density of the biomaterial; and the Kn is an integer upwards.
3. The method according to claim 2, wherein the cavities are uniformly distributed on each flat layer and have a distance of J; the space between the cavities in the X-axis direction is JxAnd the space between the holes in the Y-axis direction is Jy/2.
4. The method according to claim 3, wherein in step three, in the process of generating the cavity of the nth flat layer, whether the cavity is connected with the cavity of the (n-1) th layer is determined, and if not, an enhanced cavity with a length of dx or dy is generated in the direction of the X axis and/or the Y axis of the cavity; the length dx or dy of the enhancement cavity is less than the distance of the cavity to the edge of the flat layer.
5. The method for improving the stereogenic strength of a biomaterial according to claim 4, wherein the length dx of the enhanced cavity in the X-axis direction is less than Jx/2; the length dy of the enhancement cavity in the Y-axis direction is less than Jy/2.
6. The method according to claim 4, wherein the length dx and/or dy of the reinforced cavity is a predetermined fixed value, and the distance from the corresponding cavity to the edge of the flat layer in either direction of the X-axis or the Y-axis is greater than the fixed value or the J of the corresponding cavity in either direction of the X-axis or the Y-axisxOr Jy/2 is greater than the fixed value, then an enhancement cavity is generated in the X-axis or Y-axis direction; otherwise, no enhancement cavity is generated in the X-axis or Y-axis direction.
7. The method for improving the stereogenic strength of a biological material as claimed in any one of claims 4 to 6, wherein the area of said cavity is larger than the area of the outlet of the printer.
8. The method of claim 7, wherein the cross-sectional area of the reinforcing cavity is larger than the area of the cavity communicating with the reinforcing cavity.
9. The method of claim 7, wherein in the fourth step, during the filling of the cavities, the time T for filling is set, and the time T is the volume of the reinforcing cavities and all cavities multiplied by the flow rate at the outlet of the printer.
10. The method for improving the stereolithography strength of biological materials as claimed in claim 1, wherein in step one, a printing height threshold, a gradient threshold, a thickness threshold and a speed threshold of the 3D printer are set.
CN202111564149.9A 2021-12-20 2021-12-20 Method for improving three-dimensional forming strength of biological material Pending CN114248446A (en)

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