Three-dimensional printing intermediate product, method for generating model of object to be printed, and three-dimensional printing method

Abstract

The present application discloses a three-dimensional printing intermediate product, a method for generating a model of an object to be printed, and a three-dimensional printing method. The three-dimensional printing intermediate product comprises enclosures, three-dimensional printing pieces and a printing material, the enclosures and the three-dimensional printing pieces are printed together, and the enclosures accommodate the three-dimensional printing pieces and the printing material wrapping the three-dimensional printing pieces. The method for generating the model of the object to be printed comprises the step of generating preparation enclosure models and combination models on the basis of three-dimensional printing piece models, and the step of generating, on the basis of the preparation enclosure models, enclosure models and the model of the object to be printed. The three-dimensional printing method comprises the method for generating the model of the object to be printed. A computer program is used for implementing the method for generating the model of the object to be printed, a three-dimensional printing system comprises a computing device, and the computing device comprises a memory and an actuator which are respectively used for storing and executing the computer program. The use of the technical solution can increase the cooling speed of three-dimensional printing pieces compared with the prior art.

Description

A three-dimensional printing intermediate product, a model generation method of a to-be-printed object, and a three-dimensional printing method TECHNICAL FIELD

[0001] The present application relates to the field of three-dimensional printing, and in particular to a three-dimensional printing intermediate product, a model generation method of a to-be-printed object, and a three-dimensional printing method. BACKGROUND

[0002] In the prior art, a three-dimensional printing system includes a computing device, a three-dimensional printer, and a printing platform. The computing device is configured to obtain at least one three-dimensional printed part model from a user, arrange the three-dimensional printed part models in a virtual printing cavity according to the quantity required by the user, and perform slicing processing on the three-dimensional printed part models to form slice information of each printing layer after obtaining confirmation from the user. The three-dimensional printer obtains the slice information output by the computing device to selectively sinter the printing material on the printing platform layer by layer to form a three-dimensional printed part in the printing material. After printing is completed, the printing material is accommodated in the printing cavity of the printing platform, and the three-dimensional printed part is wrapped by the printing material. The printing platform can be attached to the three-dimensional printer so that the three-dimensional printer performs three-dimensional printing, or the printing platform can be separated from the three-dimensional printer after three-dimensional printing is completed so that the three-dimensional printed part in the printing cavity cools down. The cooling time required is generally several times the time required for three-dimensional printing. The three-dimensional printed part is removed from the printing material after cooling. With the above technical solution, the cooling time is relatively long. SUMMARY

[0003] The present application aims to overcome the above-mentioned defects or problems in the background art and provide a three-dimensional printing intermediate product, a model generation method of a to-be-printed object, and a three-dimensional printing method, which can accelerate the cooling speed compared with the prior art.

[0004] To achieve the above-mentioned purpose, the following technical solutions are adopted:

[0005] The first technical solution relates to a three-dimensional printing intermediate product, characterized by comprising an envelope, a three-dimensional printed part, and a printing material. The envelope is printed together with the three-dimensional printed part, the envelope accommodates the printing material and the three-dimensional printed part, and the printing material wraps the three-dimensional printed part.

[0006] The second technical solution is based on the first technical solution, wherein the three-dimensional printed part is a color three-dimensional printed part, and the envelope does not spray color ink during printing.

[0007] The third technical solution is based on the first or second technical solution, wherein the envelope has a uniform wall thickness, and the printing material inside the envelope has a uniform thickness or part of the printing material has a uniform thickness.

[0008] The fourth technical solution relates to a model generation method of a to-be-printed object, characterized in that the method comprises the following steps: step 2.1: generating at least one combined model in a virtual printing cavity based on a three-dimensional printed part model, wherein the combined model comprises a three-dimensional printed part model for forming a three-dimensional printed part and a corresponding preliminary envelope model, the preliminary envelope model is formed by the overall diffusion of the outer surface of the three-dimensional printed part model at the same distance, each three-dimensional printed part model is not connected in space with each other, and the wall thickness of each preliminary envelope model is uniform; and step 2.2: generating an envelope model based on each preliminary envelope model, specifically, if any preliminary envelope model is not connected with other preliminary envelope models, the preliminary envelope model is the envelope model; if any preliminary envelope model is connected with other preliminary envelope models, the envelope model parts are formed after removing the connected parts, and each envelope model part is connected to form an envelope model; and all three-dimensional printed part models and all envelope models jointly constitute a to-be-printed object model.

[0009] The fifth technical solution is based on the fourth technical solution, wherein in step 2.1, the wall thickness of each preliminary envelope model is uniform.

[0010] The sixth technical solution is based on the fourth technical solution, and further comprises step 2.3, wherein each independent envelope model is connected as a whole through at least one connection part model.

[0011] The seventh technical solution relates to a three-dimensional printing method, which comprises the following steps: step 1: obtaining at least one three-dimensional printed part model for generating a three-dimensional printed part; step 2: generating a to-be-printed object model according to the model generation method of the to-be-printed object in any one of the fourth to sixth technical solutions; step 3: generating slice information based on the to-be-printed object model; step 4: forming all to-be-printed objects layer by layer on a printing platform according to the slice information; step 5: taking out all envelopes formed by the envelope models from the printing cavity and cooling; step 6: breaking the envelopes and taking out the three-dimensional printed part from the printing material wrapped outside the three-dimensional printed part.

[0012] The eighth technical solution is based on the sixth technical solution, wherein the printing material wrapped outside the envelope in the printing cavity is recycled.

[0013] The ninth technical solution relates to a computer program for being executed by a processor to implement the model generation method of the to-be-printed object in any one of the fourth to sixth technical solutions and to generate slice information based on the to-be-printed object model.

[0014] The tenth technical solution relates to a three-dimensional printing system, which comprises a computing device, a three-dimensional printer and a printing platform, the computing device comprises an input unit, an output unit, a memory and a processor, the input unit is used to obtain a three-dimensional printing model, the output unit is used to output slicing information, the memory is used to store the computer program according to the ninth technical solution, and the processor is used to call the three-dimensional printing model and the computer program, and obtain slicing information by executing the computer program; the three-dimensional printer performs three-dimensional printing on the printing material on the printing platform according to the slicing information output by the computing device.

[0015] The eleventh technical solution relates to an envelope, which is printed together with a three-dimensional printing product and is used to accommodate the three-dimensional printing product and the printing material wrapped around the three-dimensional printing product, the envelope is provided with a weak part, and the wall thickness of the weak part is smaller than that of other parts of the envelope.

[0016] The twelfth technical solution is based on the first technical solution, wherein the envelope entirely encloses the three-dimensional printing product and the printing material wrapped around the three-dimensional printing product.

[0017] The thirteenth technical solution is based on the second technical solution, wherein the weak part is closed.

[0018] The fourteenth technical solution is based on the third technical solution, wherein the number of the weak part is one.

[0019] The fifteenth technical solution is based on the third technical solution, wherein the number of the weak part is at least two, and each weak part does not intersect with each other.

[0020] The sixteenth technical solution is based on the third technical solution, wherein the number of the weak part is at least two, and at least two weak parts intersect with each other.

[0021] The seventeenth technical solution is based on the third technical solution, wherein the intersection line between the outer surface of the weak part and the cross section is V-shaped, the cross section is perpendicular to the extension direction of the weak part, the bottom of the V shape forms an easy-to-separate part, and the easy-to-separate part extends along the extension direction of the weak part.

[0022] The eighteenth technical solution is based on the seventh technical solution, wherein a plurality of connecting ribs are arranged along the extension direction of the easy-to-separate part, and the connecting ribs connect two faces of the V-shaped cross section.

[0023] The nineteenth technical solution is based on the seventh technical solution, wherein a plurality of through holes are arranged along the extension direction of the easy-to-separate part.

[0024] The twentieth technical solution is based on the ninth technical solution, wherein the through holes extend along the extension direction of the easy-to-separate part.

[0025] The twenty-first technical solution relates to a three-dimensional printing intermediate product, comprising a three-dimensional printed part, a printing material, and the envelope of any one of the first to tenth technical solutions, the envelope containing the three-dimensional printed part and the printing material, and the printing material being wrapped around the three-dimensional printed part.

[0026] The twenty-second technical solution relates to a three-dimensional printing method, comprising: a printing step of printing a three-dimensional printed part and the envelope of any one of the first to tenth technical solutions in a three-dimensional printing cavity, the envelope containing at least one three-dimensional printed part to form the three-dimensional printing intermediate product of the eleventh technical solution; a separating step of removing the three-dimensional printing intermediate product from the three-dimensional printing cavity and exposing at least part of the outer surface of the three-dimensional printing intermediate product to the environment; a cooling step of cooling the three-dimensional printing intermediate product; a splitting step of splitting the envelope by breaking the weak part; and a taking-out step of taking out the three-dimensional printed part from the split envelope.

[0027] The twenty-third technical solution is based on the twelfth technical solution, wherein the number of the envelopes printed in the printing step is at least two.

[0028] The twenty-fourth technical solution is based on the twelfth or thirteenth technical solution, wherein all the three-dimensional printed parts are contained in the envelope. Compared with the prior art, the above-mentioned solution has the following beneficial effects:

[0029] In the first technical solution, the envelope is printed together with the three-dimensional printed part and is used to contain the three-dimensional printed part and the printing material wrapped around the three-dimensional printed part. After the three-dimensional printing process is completed, the three-dimensional printed part is wrapped by the printing material and contained in the envelope. After the three-dimensional printing process is completed, the three-dimensional printing intermediate product can be taken out from the printing cavity and taken out from the printing material wrapped around the three-dimensional printing intermediate product. Since the volume of the envelope is necessarily smaller than the volume of the printing cavity, the printing material contained in the envelope is also necessarily less than the total of the printing material contained in the printing cavity, and therefore, the cooling speed of the three-dimensional printed part in the envelope is faster than the cooling speed in the printing cavity of the prior art.

[0030] In the prior art, when printing a color three-dimensional printed part, color ink needs to be sprayed to the printing material forming the color three-dimensional printed part, and in the process of spraying the color ink, the printing material close to the three-dimensional printed part will be stained with the color ink. After the color three-dimensional printed part is cooled, the printing material stained with the color ink is easy to mix with the printing material not stained with the color ink, making the printing material not easy to be recycled and only be discarded. In the second technical solution, the three-dimensional printed part is a color three-dimensional printed part, and the envelope is not sprayed with color ink during the printing process, so the printing material close to the three-dimensional printed part and stained with the color ink is contained in the envelope. The printing material outside the envelope will not be stained with the color ink and can be recycled, and only the printing material in the envelope will be discarded, so compared with the prior art, the recycling rate of the printing material is increased and the printing cost is reduced.

[0031] In the third technical solution, the thickness of the envelope wall is uniform and the thickness of the printing material is uniform at least in part. Compared with the non-uniform envelope wall or the non-uniform printing material thickness, the cooling speed of the three-dimensional printed part in each cooling direction is close or the same, so that the shrinkage of the three-dimensional printed part in each cooling direction is close or the same, which is beneficial to ensure the dimensional accuracy of the three-dimensional printed part while accelerating the cooling. The so-called uniform thickness of the envelope wall refers to the uniform thickness of each wall of each envelope.

[0032] The fourth technical solution relates to a method for generating a model of a to-be-printed object. The envelope model is formed by uniformly expanding the outer surface of the three-dimensional printed part model by the same distance, which makes the distance between the envelope model and the three-dimensional printed part model equal, so that the thickness of the printing material between the envelope and the three-dimensional printed part is uniform during three-dimensional printing. This is beneficial to ensure the dimensional accuracy of the three-dimensional printed part while accelerating the cooling.

[0033] In the fourth technical solution, each three-dimensional printed part model is not connected in space, which can ensure the spatial separation of each three-dimensional printed part.

[0034] In the fourth technical solution, any envelope model is connected to other envelope models, and the envelope model parts are formed after removing the connected parts, and each envelope model part connected together forms an envelope model. At this time, although the thickness of the printing material in the connected part cannot be consistent with the thickness of the printing material in the unconnected part, it is beneficial to improve the space utilization of the printing cavity and improve the efficiency of three-dimensional printing.

[0035] In the fourth technical solution, each envelope model has the same wall thickness. Compared with each envelope model having different wall thickness, it is beneficial to make the envelope wall thickness uniform, and thus it is beneficial to ensure the dimensional accuracy of the three-dimensional printed part while accelerating the cooling. The uniform wall thickness of each envelope model refers to the uniform wall thickness of each part of each envelope.

[0036] In the fifth technical solution, each envelope model has uniform wall thickness, so the wall thickness of each envelope model is also uniform, and the wall thickness of the envelope printed by the envelope model is also uniform, which is beneficial to ensure the dimensional accuracy of the three-dimensional printed part while accelerating the cooling.

[0037] In the sixth technical solution, each independent envelope model is connected as a whole through at least one connection part model. Compared with the absence of the connection part model, the integrated envelope is more convenient to take out the three-dimensional printing intermediate product from the printing material wrapped outside at one time.

[0038] In the seventh technical solution, in the three-dimensional printing scheme, the cooling speed of the three-dimensional printed part can be accelerated by taking out the envelope formed by the envelope model from the printing cavity and cooling.

[0039] In the eighth technical solution, the printing material wrapped outside the envelope is not stained with the colored ink, and recycling the printing material is beneficial to save resources and reduce costs.

[0040] The ninth technical solution has the technical effects of the fourth to sixth technical solutions.

[0041] The tenth technical solution has the technical effects of the ninth technical solution.

[0042] In the eleventh technical solution, the envelope is printed together with the three-dimensional printed part and is used to contain the three-dimensional printed part and the printing material wrapped around the three-dimensional printed part. Therefore, after the three-dimensional printing process is completed, the three-dimensional printed part is wrapped by the printing material and contained in the envelope. Since the envelope is printed together with the three-dimensional printed part, after the three-dimensional printing process is completed, it is located in the three-dimensional printing cavity, and the envelope and its contents can be taken out of the three-dimensional printing cavity and directly exposed to the environment. Since the volume of the envelope is necessarily smaller than the volume of the three-dimensional printing cavity, the printing material contained in the envelope is also necessarily less than the total of the printing material contained in the three-dimensional printing cavity, and therefore, the cooling speed of the three-dimensional printed part in the envelope is faster than the cooling speed in the three-dimensional printing cavity in the prior art. Based on the above analysis, the envelope defined in the first technical solution provides a material basis for accelerating the cooling speed of the three-dimensional printed part.

[0043] In the eleventh technical solution, even if the envelope is taken out of the three-dimensional printing cavity, the three-dimensional printed part is still wrapped by the printing material and the envelope, and therefore, compared with taking the three-dimensional printed part directly out of the three-dimensional printing cavity, the cooling speed is slower, which is more beneficial to prevent the three-dimensional printed part from being deformed or cracked into waste due to rapid thermal expansion and contraction caused by too fast cooling speed.

[0044] In the eleventh technical solution, the envelope is provided with a weak part, and the wall thickness of the weak part is smaller than the wall thickness of other parts of the envelope, so that after cooling is completed, the envelope is suitable to be broken from the weak part; compared with the technical solution in which the envelope is not provided with a weak part, the envelope is more convenient to break, and at the same time, it is beneficial to avoid damaging the three-dimensional printed part during the breaking process. In particular, when the weak part is broken by twisting other parts of the envelope, since the thickness of the weak part is smaller than that of other parts, the shear stress will be concentrated in the weak part, causing plastic deformation of the weak part and then breaking.

[0045] In the twelfth technical solution, the envelope entirely encloses the three-dimensional printed pieces and the printing material contained therein. Here, the entire enclosure means that the envelope does not have an opening suitable for taking out the three-dimensional printed pieces. Since the envelope is entirely enclosed, each three-dimensional printed piece is wrapped by the printing material and the envelope in all directions. If the envelope has an opening suitable for taking out the three-dimensional printed pieces, the side of the three-dimensional printed piece adjacent to the opening is only wrapped by the printing material and not by the envelope. Therefore, compared with the technical solution in which the envelope has the opening, the isotropy of the cooling of the three-dimensional printed pieces is higher, and the three-dimensional printed pieces are less likely to deform in a specific direction due to anisotropy of cooling.

[0046] In the thirteenth technical solution, the weak part is closed, which means that the weak part is continuously extended and connected at the beginning and the end. Since the weak part is closed, when the envelope is broken, it is beneficial to separate the envelope from the weak part, and therefore, compared with the case in which the weak part is not closed, it is more beneficial to take out the three-dimensional printed pieces from the envelope and the printing material.

[0047] In the fourteenth technical solution, the number of weak parts is one. Compared with the technical solution in which the number of weak parts is at least two, when the weak part is broken by twisting the other part of the envelope, the shear force generated by the twisting is only applied to one weak part and is not dispersed to more than two weak parts, so it is easier to make the weak part damaged by the shear force and make the envelope separated.

[0048] In the fifteenth technical solution, the number of weak parts is at least two and each weak part does not intersect with each other. Compared with the case in which there is only one weak part, it is more beneficial for the envelope to accommodate more printed pieces. When the envelope accommodates more printed pieces, the envelope can be gradually opened to take out the printed pieces by breaking the weak parts one by one, and since each weak part does not intersect with each other, breaking one weak part will not affect the other weak parts, which is beneficial for safely taking out the three-dimensional printed pieces one by one.

[0049] In the sixteenth technical solution, the number of weak parts is at least two and at least two weak parts intersect with each other, so it is easier to break the weak part from the intersection point, and therefore, the envelope is easier to separate.

[0050] In the seventeenth technical solution, by setting the outer surface of the weak part in a V shape, the stress is concentrated at the bottom of the V shape, i.e., the easy-to-separate part, when the weak part is stressed. Compared with setting the outer surface of the weak part in a U shape, the stress is more concentrated, and it is easier to break the weak part, so the envelope is easier to separate. In addition, setting the V shape on the outer surface of the weak part rather than the inner surface is easier for the operator to find the easy-to-separate part.

[0051] In the eighteenth technical solution, the easy-to-separate part is provided with a plurality of connecting ribs along the extension direction of the easy-to-separate part, and the connecting ribs connect the two faces of the V-shaped cross section, so that the envelope is less likely to be broken from the easy-to-separate part when the envelope is deformed due to thermal expansion and contraction, thereby avoiding the three-dimensional printed product from being deformed or broken due to rapid cooling and becoming waste.

[0052] In the nineteenth technical solution, the easy-to-separate part is provided with a plurality of through holes along the extension direction of the easy-to-separate part. Firstly, the through holes further shorten the connecting length of the two faces of the V-shaped cross section in the extension direction of the easy-to-separate part, so that the weak part is more likely to be broken from the easy-to-separate part. Secondly, when the weak part is broken, stress will be concentrated on the intervals between the through holes, and the more concentrated stress makes the weak part more likely to be broken from the easy-to-separate part.

[0053] The twentieth technical solution is a preferred embodiment of the ninth technical solution. In the twentieth technical solution, the through holes extend along the extension direction of the easy-to-separate part, thereby further shortening the connecting length of the two faces of the V-shaped cross section, so that the weak part is more likely to be broken from the easy-to-separate part.

[0054] The twenty-first technical solution has the corresponding technical effects of the first to twentieth technical solutions referred to.

[0055] In the twenty-second technical solution, in the printing step, the envelope is formed together with the three-dimensional printed product, which is beneficial to accommodating the three-dimensional printed product in the envelope, and does not need to increase the three-dimensional printing time for forming the envelope.

[0056] In the twenty-second technical solution, in the separation step, in order to accelerate the cooling speed of the three-dimensional printed intermediate product, the three-dimensional printed intermediate product needs to be removed from the three-dimensional printing cavity in order to achieve the purpose of accelerating cooling, because the cooling speed in the three-dimensional printing cavity is slow.

[0057] In the twenty-second technical solution, in the splitting step, the envelope is split by breaking the weak part, thereby improving the splitting speed of the envelope.

[0058] In the twenty-third technical solution, the number of envelopes printed in the printing step is at least two. Compared with only one envelope, in the case of accommodating the same three-dimensional printed product, the total outer surface area of the three-dimensional printed intermediate product exposed to the environment is larger, and the cooling speed is faster.

[0059] In the twenty-fourth technical solution, all the three-dimensional printed products in the three-dimensional printing cavity are accommodated in the envelope, which is beneficial to all the three-dimensional printed products being able to obtain the effect of accelerated cooling speed. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical solutions of the embodiments, the following briefly introduces the drawings needed to be used:

[0061] Fig. 1 is a schematic view of the model of the object to be printed after step 2.1 of the method for generating a model of an object to be printed is completed;

[0062] Fig. 2 is a schematic view of the model of the object to be printed after step 2.2 of the method for generating a model of an object to be printed is completed;

[0063] Fig. 3 is a schematic view of the model of the object to be printed;

[0064] Fig. 4 is a perspective view of the model of the object to be printed.

[0065] Fig. 5 is a perspective view of the three-dimensional printing intermediate product;

[0066] Fig. 6 is a top view of the three-dimensional printing intermediate product;

[0067] Fig. 7 is a sectional view along A-A of Fig. 2;

[0068] Fig. 8 is a perspective view of the envelope in Example 2;

[0069] Fig. 9 is an enlarged view of part A of Fig. 8;

[0070] Fig. 10 is a sectional view of the three-dimensional printing intermediate product in Example 2;

[0071] Fig. 11 is a schematic view of the state when the printing step in Example 2 is performed;

[0072] Fig. 12 is a schematic view of the state when the separation step in Example 2 is performed;

[0073] Fig. 13 is a perspective view of the envelope in Example 3;

[0074] Fig. 14 is an enlarged view of part B of Fig. 13;

[0075] Fig. 15 is a perspective view of the envelope in Example 4;

[0076] Fig. 16 is an enlarged view of part C of Fig. 15;

[0077] Fig. 17 is a perspective view of the envelope in Example 5;

[0078] Fig. 18 is an enlarged view of part D of Fig. 17;

[0079] Main reference signs: 1, model of three-dimensional printed part; 2, model of object to be printed; 3, virtual printing cavity; 4, combined model; 5, three-dimensional printed part; 6, model of envelope; 7, part in contact with each other; 8, model of envelope; 9, part of model of envelope; 10, model of connecting part; 11, printing material; 12, three-dimensional printing intermediate product; 13, envelope; 14, connecting part; 15, outer wall of construction unit; 16, construction platform; 131, weak part; 132, first surface; 133, easily separable part; 134, connecting rib; 135, through hole. DETAILED DESCRIPTION

[0080] In the claims and the specification, unless otherwise defined, terms such as "first", "second", or "third" are used to distinguish different objects, rather than to describe a specific order.

[0081] In the claims and the specification, unless otherwise defined, terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation and positional relationship shown in the drawings, and are only for the convenience of simplified description, rather than implying that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation.

[0082] In the claims and the specification, unless otherwise defined, the term "fixed connection" or "fixedly connected" should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two, that is, including non-detachable fixed connection, detachable fixed connection, being integrally formed, and being fixed connected through other devices or elements.

[0083] In the claims and the specification, unless otherwise defined, the terms "comprising", "having" and their variants mean "including but not limited to".

[0084] In the claims and the specification, unless otherwise defined, the term "provided with" means that the technical feature located after it is a part of the technical feature located before it.

[0085] The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings.

[0086] Embodiment 1

[0087] In this embodiment, the three-dimensional printing system includes a computing device, a three-dimensional printer, and a printing platform.

[0088] Among them, the computing device includes an input unit, a memory, a processor, and an output unit.

[0089] The input unit is used to obtain at least one three-dimensional printing model 1 (shown in Figure 1), and the three-dimensional printing model 1 is used to define the shape of the three-dimensional printing, and the input unit is also used to obtain the quantity of each three-dimensional printing to be printed.

[0090] The memory is used to store a computer program. The computer program is used to be executed by the processor to implement the method for generating a model of the object to be printed, and generate slice information based on the model of the object to be printed 2 generated by the method for generating a model of the object to be printed.

[0091] Specifically, the method for generating a model of the object to be printed includes:

[0092] Step 2.1: generating at least one combined model 4 in the virtual printing cavity 3 based on the three-dimensional printing piece model 1, the combined model 4 including one three-dimensional printing piece model 1 and one corresponding preliminary envelope model 6 formed by the overall diffusion of the outer surface of the three-dimensional printing piece model 1 at the same distance, each three-dimensional printing piece model 1 being spatially not connected to each other, and the wall thickness of each preliminary envelope model 6 being uniform; Fig. 1 shows a schematic diagram after the completion of step 2.1. As shown in Fig. 1, there are three combined models 4 in the virtual printing cavity 3 in the embodiment, wherein the preliminary envelope model 6 of one combined model 4 does not intersect with the preliminary envelope models 6 of the other combined models 4, and the preliminary envelope models 6 of the other two combined models 4 intersect to form the connected parts 7.

[0093] Step 2.2: generating an envelope model 8 based on each preliminary envelope model 6, specifically, if any preliminary envelope model 6 is not connected to the other preliminary envelope models 6, the preliminary envelope model 6 is the envelope model 8; if any preliminary envelope model 6 is connected to the other preliminary envelope models 6, the connected parts 7 are removed to form envelope model parts 9, and the envelope model parts 9 are connected to form an envelope model 8; all three-dimensional printing piece models 1 and all envelope models 8 together constitute the to-be-printed object model 2. Fig. 2 shows a schematic diagram after the completion of step 2.2. As shown in Fig. 2, the connected parts 7 are removed, and in the embodiment, since the preliminary envelope model 6 of one combined model 4 does not intersect with the preliminary envelope models 6 of the other combined models 4, the preliminary envelope model 6 of the combined model 4 is the envelope model 8, and the preliminary envelope models 6 of the other two combined models 4 form two envelope model parts 9 after the removal of the connected parts 7, and the two envelope model parts 9 are connected to form the envelope model 8;

[0094] Step 2.3: connecting the independent envelope models 8 to form the to-be-printed object model 2 through at least one connection part model 10. Fig. 3 shows a schematic diagram of the to-be-printed object model 2, and in the embodiment, the two independent envelope models 8 are connected through the generation of the connection part model 10. The finally formed to-be-printed object model 2 is shown in Fig. 4.

[0095] As shown in Figs. 1-3, in the embodiment, the wall thickness of each preliminary envelope model 6 is uniform.

[0096] The method for generating the slicing information from the to-be-printed model 6 is a prior art, which is not described herein.

[0097] The processor is configured to retrieve the three-dimensional printing piece model 1 from the input unit and retrieve the computer program from the memory, and obtain the slicing information by executing the computer program.

[0098] The output unit is configured to output the slicing information of each printing layer.

[0099] The three-dimensional printer performs three-dimensional printing on the printing material 11 on the printing platform according to the slicing information output by the computing device.

[0100] Specifically, the printing material 11 on the printing platform is three-dimensionally printed by the three-dimensional printing method, which includes:

[0101] The slicing information of the to-be-printed object model 2 is generated by a computer program, and all to-be-printed objects are formed on the printing platform layer by layer according to the slicing information. Referring to FIGS. 5 to 7, FIGS. 5 to 7 show the three-dimensional printing intermediate product 12 in this embodiment, which includes a three-dimensional printed part 5, a printing material 11, an envelope 13, and a connecting part 14 connecting the envelopes 13. The connecting part 14 connects the independent envelopes 13. As shown in FIG. 7, the three-dimensional printed part 5 is wrapped by the printing material 11 and accommodated in the envelope 13, and the envelope wall thickness of each three-dimensional printing intermediate product 12 is uniform. In this embodiment, there are two three-dimensional printing intermediate products 12, one of which contains two three-dimensional printed parts 5 in the envelope 13, and the other of which contains only one three-dimensional printed part 5. As shown in FIG. 7, the thickness of the printing material 11 in the three-dimensional printing intermediate product 12 containing only one three-dimensional printed part 5 is uniform, and the thickness of the printing material 11 in the three-dimensional printing intermediate product 12 containing two three-dimensional printed parts 5 is partially uniform.

[0102] In this embodiment, the three-dimensional printed part 5 is a color three-dimensional printed part. In the printing process, the three-dimensional printer sprays color ink on the printing material 11 forming the color three-dimensional printed part 5. In the process of spraying color ink, the printing material 11 close to the three-dimensional printed part 5 will be stained with color ink, while the envelope 13 wrapping the three-dimensional printed part 5 and the printing material 11 stained with color ink will not be sprayed with color ink, so that the printing material 11 close to the three-dimensional printed part 5 stained with color ink is accommodated in the envelope 13.

[0103] After the printing is completed, all the envelopes 13 formed by the envelope model 8 are taken out of the printing material 11 and subjected to cooling treatment. After the three-dimensional printed part 5 is cooled, the envelope 13 outside the three-dimensional printed part 5 is broken, the three-dimensional printed part 5 in the envelope 13 is taken out, and the printing material 11 in the envelope 13 is discarded.

[0104] After all the envelopes 13 formed by the envelope model 8 are taken out of the printing material 11, the printing material 11 outside the envelope 13 is recycled and reused.

[0105] In the embodiment, the envelope 13 is printed together with the three-dimensional printed part 5 and is used to accommodate the three-dimensional printed part 5 and the printing material 11 wrapping the three-dimensional printed part 5. After the three-dimensional printing process is completed, the three-dimensional printed part 5 is wrapped by the printing material 11 and is accommodated in the envelope 13. After the three-dimensional printing process is completed, the three-dimensional printing intermediate product 12 can be taken out from the printing cavity and taken out from the printing material 11 wrapping the three-dimensional printing intermediate product 12. Since the volume of the envelope 13 is necessarily smaller than the volume of the printing cavity, the printing material 11 accommodated by the envelope 13 is also necessarily less than the total of the printing material 11 accommodated by the printing cavity, and therefore, the cooling speed of the three-dimensional printed part 5 in the envelope 13 is faster than the cooling speed in the printing cavity in the prior art.

[0106] In the prior art, when printing a color three-dimensional printed part 5, color ink needs to be sprayed to the printing material 11 forming the color three-dimensional printed part 5, and in the process of spraying the color ink, the printing material 11 close to the three-dimensional printed part 5 will be stained with the color ink. After the color three-dimensional printed part 5 is cooled, the printing material 11 stained with the color ink is easy to mix with the printing material 11 not stained with the color ink, so that the printing material 11 cannot be recycled and can only be discarded. In the embodiment, the three-dimensional printed part 5 is a color three-dimensional printed part 5, and the envelope 13 is not sprayed with color ink during the printing process, so that the printing material 11 close to the three-dimensional printed part 5 and stained with the color ink is accommodated in the envelope 13. The printing material 11 outside the envelope 13 will not be stained with the color ink and can be recycled, and only the printing material 11 in the envelope 13 will be discarded, so that the recycling rate of the printing material 11 is increased and the printing cost is reduced compared with the prior art.

[0107] In the embodiment, the envelope 13 has a uniform wall thickness and at least part of the printing material 11 has a uniform thickness. Compared with the case where the wall of the envelope 13 is not uniform or the thickness of the printing material 11 is not uniform, it is more conducive to the cooling speed of the three-dimensional printed part 5 being close to or the same in each cooling direction, so that the shrinkage rate of the three-dimensional printed part 5 in each cooling direction is close to or the same, which is conducive to speeding up the cooling while ensuring the dimensional accuracy of the three-dimensional printed part 5. Here, the uniform wall thickness of the envelope 13 means that the wall thickness of each wall of each envelope 13 is uniform.

[0108] In the embodiment, the envelope model 6 is obtained by uniformly diffusing the outer surface of the three-dimensional printed part model 1 by the same distance, which makes the distance between the envelope model 6 and the three-dimensional printed part model 1 equal, so that the thickness of the printing material 11 between the envelope 13 and the three-dimensional printed part 5 is uniform during three-dimensional printing. This is conducive to speeding up the cooling while ensuring the dimensional accuracy of the three-dimensional printed part 5.

[0109] In the embodiment, the three-dimensional printed part models 1 are not connected to each other in space, which can ensure that the three-dimensional printed parts 5 are separate in space.

[0110] In the embodiment, when any of the preliminary envelope models 6 meets other preliminary envelope models 6, the envelope model parts 9 are formed by removing the meeting parts 7, and the envelope model parts 9 meeting each other jointly form an envelope model 8. At this time, although the thickness of the printing material 11 of the meeting part cannot be consistent with the thickness of the printing material 11 of the part not meeting, it is beneficial to improve the space utilization of the printing cavity and the efficiency of three-dimensional printing.

[0111] In the embodiment, each of the preliminary envelope models 6 has the same wall thickness. Compared with each of the preliminary envelope models 6 having different wall thicknesses, it is beneficial to make the wall thickness of the envelope 13 consistent, thus ensuring the dimensional accuracy of the three-dimensional printed part 5 while accelerating the cooling. Here, the consistent wall thickness of each of the preliminary envelope models 6 means that the wall thickness of each part of each envelope 13 is consistent.

[0112] In the embodiment, the wall thickness of each of the preliminary envelope models 6 is consistent, thus the wall thickness of each of the envelope models 8 is also consistent, and the wall thickness of the envelope 13 printed by the envelope model 8 is also consistent, which is beneficial to ensure the dimensional accuracy of the three-dimensional printed part 5 while accelerating the cooling.

[0113] In the embodiment, each of the independent envelope models 8 is connected as a whole through at least one connection part model 10, and compared with the case without the connection part model 10, the envelope 13 connected as a whole is more convenient to take out the three-dimensional printing intermediate product 12 from the printing material 11 wrapped outside at one time.

[0114] In the embodiment, in the three-dimensional printing scheme, the cooling speed of the three-dimensional printed part 5 can be accelerated by taking out the envelope 13 formed by the envelope model 8 from the printing cavity and cooling.

[0115] In the embodiment, the printing material 11 wrapped outside the envelope 13 is not stained with colored ink, thus recycling it is beneficial to save resources and reduce costs.

[0116] Embodiment Two

[0117] Referring to FIG. 1, FIG. 1 shows the envelope 13 in the embodiment. As shown in FIG. 1, in the embodiment, the envelope 13 is a cuboid as a whole, and has a cavity for accommodating the three-dimensional printed part 5 and the printing material 11, wherein the printing material 11 wraps the three-dimensional printed part 5. In the embodiment, the envelope 13 entirely encloses the three-dimensional printed part 5 and the printing material 11 wrapping the three-dimensional printed part 5, and the entire enclosure herein refers to that the envelope 13 does not have an opening suitable for taking out the three-dimensional printed part 5. In other embodiments, the envelope 13 can also have an opening suitable for taking out the three-dimensional printed part 5. As shown in FIG. 1, in the embodiment, the envelope 13 has three weak portions 131, and the wall thickness of the weak portions 131 is smaller than that of other portions of the envelope 13. In the embodiment, each weak portion 131 is connected end to end and closed. In other embodiments, the weak portions 131 can also be provided to be not closed. In the embodiment, three weak portions 131 are provided, and in other embodiments, one weak portion 131 or other number of weak portions 131 can also be provided. In the embodiment, the weak portions 131 do not cross each other, and in other embodiments, at least two weak portions 131 can also be provided to cross each other.

[0118] Referring to FIG. 2, FIG. 2 shows the weak portion 131. As shown in FIG. 2, in the embodiment, the intersection between the outer surface of the weak portion 131 and the cross section perpendicular to the extension direction of the weak portion 131 is V-shaped. In the embodiment, two first surfaces 132 form two sides of the V shape respectively, and the intersection of the two first surfaces 132 is located at the bottom of the V shape to form an easy-to-separate portion 133. The extension direction of the easy-to-separate portion 133 is the same as that of the weak portion 131.

[0119] Referring to FIG. 3, FIG. 3 shows the three-dimensional printing intermediate product 12. As shown in FIG. 3, the three-dimensional printing intermediate product 12 includes the envelope 13, the three-dimensional printed part 5 and the printing material 11 in the embodiment. The envelope 13 accommodates the three-dimensional printed part 5 and the printing material 11, and the printing material 11 wraps the three-dimensional printed part 5.

[0120] The embodiment also discloses a three-dimensional printing method. The three-dimensional printing method includes a printing step, a separating step, a cooling step, a splitting step and a taking-out step.

[0121] Referring to Fig. 4, Fig. 4 shows the state after the printing step is completed in the present embodiment. As shown in Fig. 4, the printing step is completed in the build unit. The build unit comprises a build unit outer wall 15 in the shape of a cylinder and a build platform 16 extending into the build unit outer wall 15, which together enclose a three-dimensional printing cavity. The build platform 16 is raised and lowered relative to the build unit outer wall 15, so that the printing material 11 is continuously selectively solidified in the three-dimensional printing cavity, thereby performing three-dimensional printing. Specifically, in the present embodiment, both the three-dimensional printed objects 5 and the envelope 13 are formed in the three-dimensional printing cavity. Moreover, the envelope 13 is configured to enclose part or all of the three-dimensional printed objects 5 therein. In the present embodiment, two envelopes 13 are constructed, each of which contains five three-dimensional printed objects 5, and all the three-dimensional printed objects 5 are contained in the envelopes 13. In other embodiments, only one envelope 13 or multiple envelopes 13 can be provided, and part of the three-dimensional printed objects 5 can also be provided outside the envelope 13. After the envelope 13 is printed, the envelope 13 and the three-dimensional printed objects 5 contained therein, as well as the printing material 11 outside the three-dimensional printed objects 5, form the three-dimensional printing intermediate product 12 in the present embodiment. In the printing step, the three-dimensional printing intermediate product 12 is embedded in the three-dimensional printing material 11 outside the envelope 13.

[0122] Referring to Fig. 5, Fig. 5 shows the state after the separation step is completed in the present embodiment. As shown in Fig. 5, after the three-dimensional printing is completed, the contents in the three-dimensional printing cavity can be removed from the three-dimensional printing cavity by raising the build platform 16, and at least part of the printing material 11 outside the three-dimensional printing intermediate product 12 also needs to be removed in order to expose at least part of the outer surface of the three-dimensional printing intermediate product 12 to the environment. Of course, the three-dimensional printing intermediate product 12 can also be completely removed from the build platform 16 and separated from the printing material 11 in other locations.

[0123] In the cooling step, the three-dimensional printing intermediate product 12 can be left to cool to room temperature or a temperature suitable for handling in the environment.

[0124] In the disassembly step, the envelope 13 is disassembled by breaking the weak portion 131. Specifically, in the present embodiment, the envelope 13 can be disassembled by twisting other portions at the left and right ends of the envelope 13, so that the portions at the left and right ends of the envelope 13 are separated from the middle portion at the easily separable portion 133. After part of the three-dimensional printed objects 5 are removed, the easily separable portion 133 of the weak portion 131 in the middle is broken, so that the envelope 13 is completely disassembled.

[0125] In the object removal step, the three-dimensional printed objects 5 are removed from the disassembled envelope 13 and the printing material 11 outside the envelope 13. In this way, the three-dimensional printing is completed.

[0126] Embodiment Three

[0127] Referring to Figs. 6 and 7, the only difference between the present embodiment and the second embodiment is that the detachable portion 133 is provided with a plurality of connecting ribs 134 along the extension direction of the detachable portion 133, and the connecting ribs 134 connect the two first surfaces 132 which are V-shaped in cross section.

[0128] Embodiment Four

[0129] Referring to Figs. 8 and 9, the only difference between the present embodiment and the second embodiment is that the detachable portion 133 is provided with a plurality of through holes 135 along the extension direction of the detachable portion 133, and the through holes 135 are substantially circular in cross section in the present embodiment.

[0130] Embodiment Five

[0131] Referring to Figs. 10 and 11, the only difference between the present embodiment and the fourth embodiment is that the through holes 135 extend along the extension direction of the detachable portion 133, i.e. the through holes 135 are long in cross section.

[0132] In the above embodiments, the envelope 13 is printed together with the three-dimensional printed part 5 and is used to accommodate the three-dimensional printed part 5 and the printing material 11 wrapping the three-dimensional printed part 5. Therefore, after the three-dimensional printing process is completed, the three-dimensional printed part 5 is wrapped by the printing material 11 and accommodated in the envelope 13. Since the envelope 13 is printed together with the three-dimensional printed part 5, after the three-dimensional printing process is completed, it is located in the three-dimensional printing cavity, and the envelope 13 and its contents can be taken out of the three-dimensional printing cavity and directly exposed to the environment. Since the volume of the envelope 13 is necessarily smaller than the volume of the three-dimensional printing cavity, the printing material 11 accommodated by the envelope 13 is also necessarily less than the total of the printing material 11 accommodated by the three-dimensional printing cavity, therefore, the cooling speed of the three-dimensional printed part 5 in the envelope 13 is faster than the cooling speed in the three-dimensional printing cavity in the prior art. Based on the above analysis, the envelope 13 defined in the first technical solution provides a material basis for accelerating the cooling speed of the three-dimensional printed part 5.

[0133] In the above embodiments, even if the envelope 13 is taken out of the three-dimensional printing cavity, the three-dimensional printed part 5 is still wrapped by the printing material 11 and the envelope 13, therefore, compared to directly taking the three-dimensional printed part 5 out of the three-dimensional printing cavity, the cooling speed is slower, which is more conducive to preventing the three-dimensional printed part 5 from being deformed or cracked due to rapid thermal expansion and contraction and becoming a waste product.

[0134] In the above embodiments, the envelope 13 is provided with a weakened portion 131, the thickness of the weakened portion 131 is less than the thickness of other portions of the envelope 13, thus after cooling, the envelope 13 is adapted to be broken from the weakened portion 131; compared with the technical solution that the envelope 13 is not provided with a weakened portion 131, the envelope 13 is more convenient to break, and at the same time, it is beneficial to avoid damaging the three-dimensional printed part 5 during the breaking process. Especially when the weakened portion 131 is broken by twisting the other portions of the envelope 13, since the thickness of the weakened portion 131 is less than the other portions, the shear stress will be concentrated on the weakened portion 131, causing the weakened portion 131 to plastically deform and break.

[0135] In the above embodiments, the envelope 13 entirely encloses the three-dimensional printed part 5 and the printing material 11 contained therein. Since the envelope 13 is entirely enclosed, each three-dimensional printed part 5 is wrapped by the printing material 11 and the envelope 13 in all directions. If the envelope 13 is provided with an opening adapted to take out the three-dimensional printed part 5, the three-dimensional printed part 5 adjacent to the opening is only wrapped by the printing material 11 on the side facing the opening without the envelope 13. Therefore, compared with the technical solution that the envelope 13 is provided with the above opening, the isotropy of the cooling of the three-dimensional printed part 5 is higher, and it is less likely to deform in a specific direction due to the anisotropy of the cooling.

[0136] In the above embodiments, the closure of the weakened portion 131 means that the weakened portion 131 continuously extends and connects at the beginning and end. The closure of the weakened portion 131 is beneficial for the separation of the envelope 13 from the weakened portion 131 when the envelope 13 is broken, thus compared with the case that the weakened portion 131 is not closed, it is more beneficial to take out the three-dimensional printed part 5 from the envelope 13 and the printing material 11.

[0137] In an embodiment, the number of weakened portions 131 is one. Compared with the technical solution that the number of weakened portions 131 is at least two, when the weakened portion 131 is broken by twisting the other portions of the envelope 13, the shear force generated by the twisting is only applied to one weakened portion 131, and will not be dispersed to more than two weakened portions 131, thus it is easier to make the weakened portion 131 damaged due to the shear force and make the envelope 13 separated.

[0138] In the above embodiments, the number of weakened portions 131 is at least two and each weakened portion 131 does not intersect with each other, compared with the case that there is only one weakened portion 131, it is more beneficial for the envelope 13 to accommodate more printed parts. When the envelope 13 accommodates more printed parts, the envelope 13 can be gradually opened to take out the printed parts by breaking the weakened portions 131 one by one, and since each weakened portion 131 does not intersect with each other, the breaking of one weakened portion 131 will not affect the other weakened portions 131, which is beneficial for the safe taking out of the three-dimensional printed part 5 one by one.

[0139] In one embodiment, the number of the weakened portions 131 is at least two and the at least two weakened portions 131 intersect each other, thus the weakened portions 131 are more easily broken from the intersection point, thus the envelope 13 is more easily separated.

[0140] In each of the above embodiments, by setting the outer surface of the weakened portion 131 as a V shape, the stress is concentrated at the bottom of the V shape, i.e. the easy-to-separate portion 133, when the weakened portion 131 is stressed, compared to setting the outer surface of the weakened portion 131 as a U shape, the stress is more concentrated, and the weakened portion 131 is more easily broken, thus the envelope 13 is more easily separated. In addition, the V shape is arranged on the outer surface of the weakened portion 131 rather than the inner surface, which is easier for the operator to find the easy-to-separate portion 133.

[0141] In the third embodiment, the easy-to-separate portion 133 is provided with a plurality of connecting ribs 134 along the extension direction thereof, and the connecting ribs 134 connect the two faces of the V-shaped cross section, thus when the envelope 13 is deformed due to thermal expansion and contraction, it is more difficult to crack from the easy-to-separate portion 133, thereby avoiding the three-dimensional printed part 5 from being deformed or cracked due to rapid cooling and becoming a waste product.

[0142] In the fourth embodiment, the easy-to-separate portion 133 is provided with a plurality of through holes 135 along the extension direction thereof, firstly, these through holes 135 further shorten the connecting length of the two faces of the V-shaped cross section in the extension direction of the easy-to-separate portion 133, thus the weakened portion 131 is more easily broken from the easy-to-separate portion 133; secondly, when broken, the stress will be concentrated on the interval between the through holes 135, the stress is more concentrated, and the weakened portion 131 is more easily broken from the easy-to-separate portion 133.

[0143] In the fifth embodiment, the through holes 135 extend along the extension direction of the easy-to-separate portion 133, thus further shortening the connecting length of the two faces of the V-shaped cross section, thus the weakened portion 131 is more easily broken from the easy-to-separate portion 133.

[0144] In each of the above embodiments, in the printing step, the envelope 13 is formed together with the three-dimensional printed part 5, which not only facilitates the accommodation of the three-dimensional printed part 5 therein, but also does not need to increase the three-dimensional printing time for the formation of the envelope 13.

[0145] In each of the above embodiments, in the separation step, due to the slow cooling speed in the three-dimensional printing cavity, in order to accelerate the cooling speed of the three-dimensional printing intermediate product 12, it is necessary to remove the three-dimensional printing intermediate product 12 from the three-dimensional printing cavity in order to achieve the purpose of accelerating the cooling.

[0146] In each of the above embodiments, in the splitting step, the envelope 13 is split by breaking the weakened portion 131, thereby improving the splitting speed of the envelope 13.

[0147] In the above embodiments, the number of the envelopes 13 printed in the printing step is at least two, compared with only one envelope 13, in the case of accommodating the same three-dimensional printed part 5, the total outer surface area of the three-dimensional printing intermediate product 12 formed is larger, and the cooling speed is faster.

[0148] In the above embodiments, all the three-dimensional printed parts 5 in the three-dimensional printing cavity are accommodated in the envelope 13, which is beneficial to the effect of accelerating the cooling speed of all the three-dimensional printed parts 5.

[0149] The above description and embodiment are used to explain the protection scope of the present application, but do not constitute a limitation on the protection scope of the present application.

Claims

1. A three-dimensional printing intermediate product, characterized in that: It includes an envelope, a 3D printed part, and printing material. The envelope is printed together with the 3D printed part. The envelope contains the printing material and the 3D printed part, and the printing material wraps around the 3D printed part.

2. The 3D printing intermediate product as described in claim 1, characterized in that, The 3D printed part is a color 3D printed part, and the cover is not sprayed with color ink during the printing process.

3. A three-dimensional printing intermediate product as described in claim 1 or 2, characterized in that, The envelopes have a uniform wall thickness, and the printed material inside the envelopes has a uniform thickness or a portion of the printed material has a uniform thickness.

4. A method for generating a model of an object to be printed, characterized in that, include: Step 2.1: Generate at least one combined model in the virtual printing cavity based on the 3D printed part model. The combined model includes a 3D printed part model for forming a 3D printed part and a corresponding pre-enclosure model. The pre-enclosure model is formed by the overall diffusion of the outer surface of the 3D printed part model at the same distance. The 3D printed part models are not connected to each other in space, and the wall thickness of each pre-enclosure model is consistent. Step 2.2: Generate envelope models based on each pre-existing envelope model. Specifically, if any pre-existing envelope model is not connected to other pre-existing envelope models, then that pre-existing envelope model is the envelope model; if any pre-existing envelope model is connected to other pre-existing envelope models, then remove the connected parts to form envelope model parts, and the connected envelope model parts together form an envelope model; all 3D printable models and all envelope models together constitute the model of the object to be printed.

5. The method for generating a model of an object to be printed as described in claim 4, characterized in that, In step 2.1, the wall thickness of each pre-made envelope model is consistent.

6. The method for generating a model of an object to be printed as described in claim 4, further comprising step 2.3, characterized in that, Each independent envelope model is connected as one unit through at least one connecting part model.

7. A three-dimensional printing method, characterized in that, include: Step 1: Obtain at least one 3D printed part model for generating the 3D printed part; Step 2: Generate a printable model according to any one of claims 4 to 6; Step 3: Generate slice information based on the model of the object to be printed; Step 4: Form all the objects to be printed layer by layer on the printing platform according to the slicing information; Step 5: Remove all the envelopes formed from the envelope mold from the printing cavity and allow them to cool; Step 6: Break open the envelope and remove the 3D printed part from the printing material wrapped around it.

8. A three-dimensional printing method as described in claim 7, characterized in that, The printing material wrapped around the envelope in the printing cavity is recycled.

9. A computer program characterized in that, It is used to be executed by a processor to implement the method for generating a printable model as described in any one of claims 4 to 6, and to generate slice information based on the printable model.

10. A three-dimensional printing system, characterized in that, It includes a computing device, a 3D printer, and a printing platform. The computing device includes an input unit, an output unit, a memory, and a processor. The input unit is used to acquire a 3D printed model, the output unit is used to output slicing information, the memory is used to store the computer program as described in claim 9, and the processor is used to retrieve the 3D printed model and the computer program, and acquire slicing information by executing the computer program. The 3D printer performs 3D printing on the printing material on the printing platform according to the slicing information output by the computing device.

11. A cover, characterized in that: It is printed together with the 3D printed part and is used to contain and wrap the 3D printed part. The envelope has a weak part, and the wall thickness of the weak part is less than the wall thickness of other parts of the envelope.

12. A cover according to claim 11, characterized in that: The envelope completely encloses the 3D printed part it contains and the printing material that wraps the 3D printed part.

13. A cover according to claim 12, characterized in that: The intersection of the outer surface of the weak part and the cross section forms a V-shape, the cross section is perpendicular to the extension direction of the weak part, the bottom of the V-shape forms an easily separable part, and the easily separable part extends along the extension direction of the weak part.

14. A cover according to claim 13, characterized in that: The easily separable part is provided with several connecting ribs along its extension direction, and the connecting ribs connect two V-shaped surfaces of the cross section.

15. A cover according to claim 13, characterized in that, The easily separable part is provided with a plurality of through holes along its extension direction, and the through holes extend along the extension direction of the easily separable part.

16. A three-dimensional printing intermediate product, comprising a three-dimensional printed part, printing material, and an envelope as described in any one of claims 11 to 15, characterized in that: The envelope contains the 3D printed part and the printing material, with the printing material wrapped around the 3D printed part.

17. A three-dimensional printing method, characterized in that, include: Printing steps: Printing a 3D printed part and an envelope as described in any one of claims 11 to 15 in a 3D printing cavity, the envelope accommodating at least one 3D printed part to form the 3D printing intermediate product as described in claim 16; Separation step: Remove the 3D printing intermediate from the 3D printing cavity and expose at least a portion of the outer surface of the 3D printing intermediate to the environment; Cooling step: Cooling the intermediate products of 3D printing; Disassembly steps: Disassemble the envelope by breaking through the weak point; Retrieval steps: Remove the 3D printed part from the disassembled envelope.

18. A three-dimensional printing method according to claim 17, characterized in that: All 3D printed parts are housed in envelopes.

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