A method for printing a metal 3D shoe form

Abstract

The present application relates to a kind of metal 3D shoe mold printing method, belong to 3D printing technical field, it includes the following steps: S1. setting laser galvanometer group, laser galvanometer group includes the small spot galvanometer unit of central arrangement and several large spot galvanometer unit arranged around small spot galvanometer unit;The printing range of the small spot galvanometer unit covers entire part, the collection of the printing range of the large spot galvanometer unit covers entire part;S2. the printing data of part external surface is assigned to small spot galvanometer unit, the printing data of the internal part of part is assigned to each large spot galvanometer unit, and 3D printing is carried out to part.This method splicing part is all in the interior of shoe mold, external surface is printed by one galvanometer unit, surface has no any splicing, meet the high surface quality requirement of shoe mold finished product, the requirement of low surface roughness, the requirement of not high internal density, the present application can also optimize printing data distribution amount, so that printing speed is optimal, improve printing efficiency.

Description

Technical Field

[0001] This invention belongs to the field of 3D printing technology, specifically relating to a method for printing metal 3D shoe molds. Background Technology

[0002] Laser processing, such as laser cutting, laser welding, laser marking, and laser 3D printing, typically uses a single laser beam reflected by a galvanometer to scan a curved image on a two-dimensional working plane or curved surface. Laser processing is an advanced rapid manufacturing technology.

[0003] In 3D printing, SLA, SLS, and SLM employ a method of reflecting a single laser beam through a galvanometer to scan and print an image on a two-dimensional working plane. Compared to traditional subtractive manufacturing technologies, 3D printing is an advanced additive manufacturing technology for rapidly producing parts. The role of an SLM metal 3D printer is to manufacture parts by melting metal powder under the thermal effect of a laser beam, cooling and solidifying it, and then stacking layers together.

[0004] Metal 3D printing has high requirements for printing lasers. The laser beam needs to be a pure single-mode output with a beam quality M2 of less than 1.1. Lasers with high beam quality usually have low laser power, which cannot be used to further improve printing efficiency. Therefore, in order to improve printing efficiency, the industry routinely uses multiple laser beams to scan and print simultaneously through multiple mirrors to improve efficiency.

[0005] In metal 3D printing, the printing of a part typically includes infill lines and outlines. Infill lines are used to fill the internal areas of the sintered and printed part, while outlines are used to print the surface of the part. The requirements for printing outlines and infill lines are different: outlines require the smallest possible spot size and printing precision to ensure that the surface quality of the part is good enough and the roughness is low; infill lines require high printing efficiency to quickly scan and fill the content. At the same time, the number of infill lines in a printed pattern is far greater than the number of scan lines.

[0006] Therefore, in order to improve printing efficiency without reducing accuracy, a variable spot system can be used. A small spot is used for precise printing of outlines, while a large spot is used for printing fill lines. This increases laser power, increases the spacing between fill lines, and reduces the number of fill lines, thereby improving printing efficiency.

[0007] Metal 3D printing of shoe molds is a significant application area in the current market. The following requirements must be met when printing shoe molds: 1. The surface quality of the finished shoe mold parts must be extremely high, with very low surface roughness and complete reproduction of all subtle surface textures; 2. Since the internal structure of the shoe mold parts does not need to withstand external tensile and compressive forces during subsequent production, the requirements for internal porosity and density are not high; 3. As a fast-moving consumer product, shoe molds require high efficiency in printing, necessitating the minimization of printing time. Currently, in the field of shoe mold printing, to meet the surface quality requirements of printed shoe mold parts, small laser spot sizes are used for 3D sintering printing. This results in low printing efficiency, making it difficult to meet market demands for timely printing cycles. Using larger laser spot sizes, while improving efficiency, risks a decrease in the surface quality of the shoe mold parts.

[0008] To improve printing efficiency, multiple lasers can be used to print a single shoe mold to shorten printing time. However, this method results in a decrease in quality at the seams where multiple lasers meet. Since shoe molds require high surface quality, the seams at the multiple laser connections are even more critical. In most cases, these seams will have a visible impact on the finished product, which limits the use of multiple lasers to shorten printing time. Summary of the Invention

[0009] The purpose of this invention is to provide a method for printing metal 3D shoe molds, so as to solve the problems of reduced quality and low printing efficiency at the multi-laser splicing points in existing multi-laser metal 3D shoe mold printing.

[0010] To achieve the above objectives, the technical solution of the present invention is as follows:

[0011] This invention relates to a method for printing metal 3D shoe molds, which includes the following steps:

[0012] S1. A laser galvanometer group is set up, which includes a small spot galvanometer unit set in the center and several large spot galvanometer units set around the small spot galvanometer unit; the printing range of the small spot galvanometer unit covers the entire part, and the combined printing range of the large spot galvanometer units covers the entire part.

[0013] S2. Assign the printing data of the outer surface of the part to the small spot galvanometer unit, and assign the printing data of the inner part of the part to the large spot galvanometer unit to perform 3D printing on the part.

[0014] Preferably, in step S2, the printing data of the internal parts of the part are allocated to the major spot galvanometer units according to the principle of equal data volume.

[0015] Preferably, in step S2, when distributing the printing data of the internal part of the part to the large spot galvanometer units, a remelting area is set between adjacent large spot galvanometer units, and the width of the remelting area is not less than the printing drift amount of the large spot galvanometer unit.

[0016] Preferably, in step S2, after allocating the printing data of the outer surface of the part to the small-spot galvanometer unit and the printing data of the inner part of the part to the large-spot galvanometer units, the printing time of each large-spot galvanometer unit is recorded as S1, and the printing time of each small-spot galvanometer unit is recorded as S2. Based on the printing times of the large-spot galvanometer units and the small-spot galvanometer units, the allocation of printing data is optimized. The optimization method is as follows:

[0017] When the printing time of the small spot galvanometer unit is not less than that of the large spot galvanometer unit, the amount of printing data allocation is not optimized.

[0018] When the printing time of the small spot galvanometer unit is less than that of the large spot galvanometer unit, a portion of the internal printing data is allocated to the small spot galvanometer unit, such that the printing time of the large spot galvanometer unit after data allocation satisfies the following formula:

[0019]

[0020]

[0021] Where S1′ and S2′ are the printing times of the optimized small spot galvanometer unit and the large spot galvanometer unit, respectively; S1 and S2 are the printing times of the small spot galvanometer unit and the large spot galvanometer unit before optimization, respectively; N is the total number of small spot galvanometer units and large spot galvanometer units; and M indicates that the printing efficiency of the large spot galvanometer unit is M times that of the small spot galvanometer unit.

[0022] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0023] 1. The metal 3D shoe mold printing method of the present invention uses a laser galvanometer group comprising a centrally located small spot galvanometer unit and several large spot galvanometer units arranged around the small spot galvanometer unit. The printing range of the small spot galvanometer unit covers the entire part, and the combined printing range of the large spot galvanometer units covers the entire part. During printing, the printing data of the outer surface of the part is allocated to the small spot galvanometer unit, and the printing data of the inner part of the part is allocated to the large spot galvanometer units. In this way, the splicing parts are all inside the shoe mold, and the outer surface is printed by one galvanometer unit. There are no splices on the surface, which meets the requirements of very high surface quality, very low surface roughness, and low internal density of the finished shoe mold.

[0024] 2. The metal 3D shoe mold printing method of the present invention distributes the printing data of the internal part of the part to the large spot galvanometer units according to the principle of equal data volume, so that the scanning time of the large spot galvanometer units is equal, thereby making the printing efficiency higher; when distributing the printing data of the internal part of the part to the large spot galvanometer units, a remelting area is set between adjacent large spot galvanometer units, and the width of the remelting area is not less than the printing drift of the large spot galvanometer unit, so that even if the galvanometer is unstable, the internal splicing area will not break.

[0025] 3. The metal 3D shoe mold printing method of the present invention allocates some of the printing data of the internal part to the small spot galvanometer unit when the printing time of the small spot galvanometer unit is less than that of the large spot galvanometer unit, so that the printing time of the small spot galvanometer unit is equal to that of the large spot galvanometer unit, thereby achieving the optimal printing speed. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the printing process of the metal 3D shoe mold printing method involved in this invention;

[0027] Figure 2 This is a schematic diagram showing the splicing positions of each printing unit in the metal 3D shoe mold printing method of the present invention. Detailed Implementation

[0028] To further understand the content of this invention, the invention will be described in detail with reference to the embodiments. The following embodiments are used to illustrate the invention, but are not intended to limit the scope of the invention.

[0029] See attached document Figure 1 As shown, this invention relates to a method for printing metal 3D shoe molds, which includes the following steps:

[0030] S1. A laser galvanometer group is set up, which includes a small spot galvanometer unit 1 set in the center and several large spot galvanometer units 2 set around the small spot galvanometer unit 1; the printing range of the small spot galvanometer unit 1 covers the entire part, and the combined printing range of the large spot galvanometer units 2 covers the entire part.

[0031] The small spot galvanometer unit 1 uses a laser with a beam quality M2 of less than 1.1 and high beam quality. Since the printing quality of the internal filling part of the shoe mold part is not very high, the large spot galvanometer unit 2 can use a laser with poor beam quality and a higher M2 to reduce equipment cost.

[0032] S2. Assign the printing data for the outer surface of the part to the small-spot galvanometer unit 1, and assign the printing data for the inner part of the part to the large-spot galvanometer units 2 according to the principle of equal data volume, ensuring that the printing time of each large-spot galvanometer unit 2 is the same. Figure 2 As shown. For the large spot galvanometer unit 2, a remelting area is set for adjacent large spot galvanometer units 2. The width of the remelting area is not less than the printing drift of the large spot galvanometer unit. For example, if the long-term printing drift of the galvanometer of the large spot galvanometer unit 2 is 0.5mm, then the width of the remelting area of ​​the printing data allocated to the adjacent large spot galvanometer units 2 is not less than 0.5mm. In this way, even if the galvanometer becomes unstable, there will be no breakage of the internal splicing area. After allocating the printing data of the outer surface of the part to the small spot galvanometer unit 1 and the printing data of the inner part of the part to the large spot galvanometer units 2, the printing time of each large spot galvanometer unit 2 is calculated as S1 based on the printing data volume and printing speed of each galvanometer unit, and the printing time of the small spot galvanometer unit 1 is calculated as S2. Based on the printing time of the large spot galvanometer unit and the small spot galvanometer unit, the distribution of printing data is optimized. The optimization method is as follows:

[0033] When the printing time of the small spot galvanometer unit 1 is not less than the printing time of the large spot galvanometer unit 2, that is, when S2≥S1, the amount of printing data allocation is not optimized in this case because allocating the printing data of the outer surface of the part to the large spot galvanometer unit 2 will cause the surface quality of the part to decrease.

[0034] When the printing time of small spot galvanometer unit 1 is less than the printing time of large spot galvanometer unit 2, i.e., S2 < S1, the data volume of small spot galvanometer unit 1, which is responsible for printing the outer surface of the part, is too small. Therefore, the printing data for the internal parts of the part needs to be allocated to small spot galvanometer unit 1 as well. This allocation of some internal printing data ensures that the printing time of large spot galvanometer unit 2 and the printing time of small spot galvanometer unit 1 after data allocation satisfy the following formula:

[0035]

[0036] Where S1′ and S2′ represent the printing times of the optimized small-spot galvanometer unit and the large-spot galvanometer unit, respectively; S1 and S2 represent the printing times of the small-spot galvanometer unit and the large-spot galvanometer unit before optimization, respectively; N represents the total number of small-spot galvanometer units and the large-spot galvanometer unit; and M indicates that the printing efficiency of the large-spot galvanometer unit is M times that of the small-spot galvanometer unit. At this point, S1′=S2′ is satisfied, meaning that the printing time for the small-spot galvanometer and the large-spot galvanometer unit is the same, maximizing printing efficiency.

[0037] Based on the above allocation results, the parts are 3D printed.

[0038] The present invention has been described in detail above with reference to the embodiments, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made in accordance with the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A method for printing metal 3D shoe molds, characterized in that: It includes the following steps: S1. A laser galvanometer group is set up, which includes a small spot galvanometer unit set in the center and several large spot galvanometer units set around the small spot galvanometer unit; the printing range of the small spot galvanometer unit covers the entire part, and the combined printing range of the large spot galvanometer units covers the entire part. S2. Assign the printing data of the outer surface of the part to the small spot galvanometer unit, and assign the printing data of the inner part of the part to the large spot galvanometer units according to the principle of equal data volume. Record the printing time of each large spot galvanometer unit as S1 and the printing time of each small spot galvanometer unit as S2. Optimize the distribution of printing data based on the printing time of the large spot galvanometer units and the small spot galvanometer units, and perform 3D printing on the part. The way to optimize the distribution of print data is as follows: When the printing time of the small spot galvanometer unit is not less than that of the large spot galvanometer unit, the amount of printing data allocation is not optimized. When the printing time of the small spot galvanometer unit is less than that of the large spot galvanometer unit, a portion of the internal printing data is allocated to the small spot galvanometer unit, such that the printing time of the large spot galvanometer unit after data allocation satisfies the following formula: ， ， Where S1' and S2' represent the printing times of the optimized small-spot galvanometer unit and the large-spot galvanometer unit, respectively, and S1 and S2 represent the printing times of the unoptimized small-spot galvanometer unit and the large-spot galvanometer unit, respectively. N This represents the total number of small-spot galvanometer units and large-spot galvanometer units. M This indicates that the printing efficiency of the large-spot galvanometer unit is equal to that of the small-spot galvanometer unit. M times.

2. The metal 3D shoe mold printing method according to claim 1, characterized in that: In step S2, when the printing data of the internal part of the part is allocated to the large spot galvanometer units, a remelting area is set between adjacent large spot galvanometer units, and the width of the remelting area is not less than the printing drift amount of the large spot galvanometer unit.

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