High-density powder bed spreading device

Abstract

The utility model discloses a high-density powder bed spreading device which comprises a device body, a powder spreading module, a first feeding hopper, a second feeding hopper, a powder spreading scraper, a powder spreading roller, a first movement guide rail, a second movement guide rail, a forming platform, a binder spraying module, a first powder collecting groove, a second powder collecting groove and a gate plate. The device can spread out two kinds of powder with different particle sizes at the same time, the large-particle-size powder is spread out preferentially, then the small-particle-size powder is spread out, gaps formed by the large-particle-size powder are filled with the small-particle-size powder, and then the powder is spread out to form a high-density powder bed.

Description

Technical Field

[0001] The utility model relates to the technical field of additive manufacturing, and more specifically to a high-density powder bed spreading device. Background Art

[0002] Additive manufacturing technology, also known as 3D printing technology, is a manufacturing method that directly shapes products from a three-dimensional digital model by adding materials layer by layer. For additive manufacturing technology that uses powdered materials to shape products, the density of the powder bed is one of the key factors affecting product quality. The density of the powder bed directly affects the density of the final product, thereby affecting the mechanical properties of the product.

[0003] In the field of additive manufacturing, increasing the density of the powder bed is generally achieved by using small-particle powder. As the powder particle size decreases, the gaps between the powders decrease after the powder is spread, and the density of the powder bed increases.

[0004] However, the reduction of powder particle size will lead to an increase in the tendency of powder agglomeration, a decrease in powder fluidity, a sharp increase in the difficulty of powder spreading, and a decrease in the density of the powder bed. Therefore, the improvement of powder bed density is still one of the research directions in the field of powder material additive manufacturing. Utility Model Content

[0005] The utility model aims to solve one of the above-mentioned technical problems in the prior art at least to a certain extent.

[0006] To this end, one purpose of the utility model is to provide a high-density powder bed spreading device, which spreads powder to form a high-density powder bed. The device can spread two powders of different particle sizes at the same time, preferentially spread the large particle size powder, and then spread the small particle size powder, so that the small particle size powder fills the gap formed by the large particle size powder, and then spreads to form a high-density powder bed.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions.

[0008] A high-density powder bed spreading device, comprising: an equipment body, a powder spreading module, a first feeding hopper, a second feeding hopper, a powder spreading scraper, a powder spreading roller, a first moving guide rail, a second moving guide rail, a molding platform and a binder injection module;

[0009] The first motion guide rail is arranged on both sides above the main body of the device, the powder spreading module is connected to the first motion guide rail and moves on the first motion guide rail; the second motion guide rail is arranged on the opposite side of the powder spreading module, and both ends are connected to the first motion guide rail;

[0010] The binder spraying module is connected to the second motion guide rail and moves on the second motion guide rail;

[0011] The first feeding hopper, the second feeding hopper, the powder spreading scraper and the powder spreading roller are all connected to the powder spreading module; the first feeding hopper and the second feeding hopper are arranged in parallel, and the second feeding hopper is located on a side close to the binder injection module; the powder spreading scraper is located between the first feeding hopper and the second feeding hopper; the powder spreading roller is located below the second feeding hopper on a side close to the binder injection module;

[0012] The forming platform is arranged at the center of the equipment body, and the powder spreading scraper, the powder spreading roller and the forming platform height can be adjusted as needed.

[0013] Furthermore, the above device also includes: a first powder collecting trough, a second powder collecting trough and a gate plate;

[0014] The first powder collecting trough, the second powder collecting trough and the gate plate are all arranged on a side of the equipment body away from the binder spraying module;

[0015] Furthermore, the gate plate is located between the first powder collecting trough and the second powder collecting trough.

[0016] In the utility model, the first feeding hopper is used to hold powder with larger particle size, the second feeding hopper is used to hold powder with smaller particle size, the powder spreading scraper is used to spread powder with larger particle size, the powder spreading roller is used to spread powder with smaller particle size, and the powder spreading scraper and the powder spreading roller are at the same height relative to the forming platform; the first powder collecting trough is mainly used to collect powder with large particle size; the second powder collecting trough is mainly used to collect powder with small particle size; the gate plate is mainly used to control the switching of the powder falling channels of the first powder collecting trough and the second powder collecting trough.

[0017] It can be seen from the above technical solution that compared with the prior art, the utility model has the following beneficial effects: by adopting the method of successively spreading powders of two particle sizes, a relatively high homogeneous powder bed with uniform and dense powder distribution can be formed, further improving the density of the molded body in the binder injection molding technology, reducing the difficulty of rear-end sintering, and improving the density of the final product to ensure that the product has good mechanical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 This is the front view of the device of the utility model;

[0020] Figure 2It is a three-dimensional diagram of the device of the utility model;

[0021] Figure 3 This is a comparison diagram of the effects of the utility model and the prior art, wherein the left side is a diagram of the powder bed effect of the conventional powder spreading method, and the right side is a diagram of the powder bed effect of the powder spreading method of the utility model.

[0022] Among them, in the figure:

[0023] 1-first feeding hopper; 2-second feeding hopper; 3-powder spreading scraper; 4-powder spreading roller; 5-powder spreading module; 6-first moving guide rail; 7-binder injection module; 8-second moving guide rail; 9-forming platform; 10-first powder collecting trough; 11-second powder collecting trough; 12-gate; 13-equipment body. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] Example 1

[0030] See also Figure 1 and Figure 2 The present embodiment provides a high-density powder bed spreading device, including: an equipment body 13, a powder spreading module 5, a first feeding hopper 1, a second feeding hopper 2, a powder spreading scraper 3, a powder spreading roller 4, a first moving guide rail 6, a second moving guide rail 8, a molding platform 9, a binder injection module 7, a first powder collecting trough 10, a second powder collecting trough 11 and a gate 12;

[0031] The first motion guide rail 6 is arranged on both sides above the equipment body 13, and the powder spreading module 5 is connected to the first motion guide rail 6 and moves on the first motion guide rail 6; the second motion guide rail 8 is arranged on the opposite side of the powder spreading module 5, and both ends are connected to the first motion guide rail 6;

[0032] The binder spraying module 7 is connected to the second motion guide rail 8 and moves on the second motion guide rail 8;

[0033] The first feeding hopper 1, the second feeding hopper 2, the powder spreading scraper 3 and the powder spreading roller 4 are all connected to the powder spreading module 5; the first feeding hopper 1 and the second feeding hopper 2 are arranged in parallel, and the second feeding hopper 2 is located on the side close to the binder injection module 7; the powder spreading scraper 3 is located between the first feeding hopper 1 and the second feeding hopper 2; the powder spreading roller 4 is located below the second feeding hopper 2 on the side close to the binder injection module 7;

[0034] The forming platform 9 is arranged at the center of the equipment body 13, and the powder spreading scraper 3, the powder spreading roller 4 and the forming platform 9 height can be adjusted as needed.

[0035] The first powder collecting tank 10, the second powder collecting tank 11 and the gate plate 12 are all arranged on a side of the equipment body 13 away from the binder spraying module 7;

[0036] Furthermore, the gate plate 12 is located between the first powder collecting tank 10 and the second powder collecting tank 11 .

[0037] How it works

[0038] The device works as follows:

[0039] (1) Adding large-particle powder in the first feeding hopper 1, the particle size of the powder may be in the range of 15-50 μm, and adding small-particle powder in the second feeding hopper 2, the particle size of the powder may be in the range of 5-10 μm;

[0040] (2) The powder spreading module 5 moves from one side of the second moving guide rail 8 to the opposite side, and the first feeding hopper 1 spreads the powder evenly on the forming platform 9 and is flattened by the powder spreading scraper 3. At the same time, the second feeding hopper 2 spreads the small-particle powder, which has a powder supply of about 1 / 3 of that of the first feeding hopper 1, on the plane of the large-particle powder. After being compacted by the powder spreading roller 4, the small-particle powder fills the pores with the large-particle powder to form a high-density powder bed;

[0041] (3) When the first feeding hopper 1 moves to the first powder collecting trough 10, the gate 12 is in the lowered state, and the powder falls into the first powder collecting trough 10. After the first feeding hopper 1 passes through the first powder collecting trough 10, the gate 12 rises to form a new powder collecting channel, and the powder falls into the second powder collecting trough 11;

[0042] (4) The binder spraying module 7 sprays the binder onto the surface of the powder to bond the powder together;

[0043] (5) Repeat the first step, spreading powder layer by layer and printing layer by layer to form a high-density green body.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0045] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A high-density powder bed spreading device, characterized in that: include: Equipment body, powder spreading module, first feeding hopper, second feeding hopper, powder spreading scraper, powder spreading roller, first moving guide rail, second moving guide rail, forming platform and binder injection module; The first motion guide rail is arranged on both sides above the main body of the device, the powder spreading module is connected to the first motion guide rail and moves on the first motion guide rail; the second motion guide rail is arranged on the opposite side of the powder spreading module, and both ends are connected to the first motion guide rail; The binder spraying module is connected to the second motion guide rail and moves on the second motion guide rail; The first feeding hopper, the second feeding hopper, the powder spreading scraper and the powder spreading roller are all connected to the powder spreading module; the first feeding hopper and the second feeding hopper are arranged in parallel, and the second feeding hopper is located on a side close to the binder injection module; the powder spreading scraper is located between the first feeding hopper and the second feeding hopper; the powder spreading roller is located below the second feeding hopper on a side close to the binder injection module; The forming platform is arranged at the center of the equipment body, and the powder spreading scraper, the powder spreading roller and the forming platform height can be adjusted as needed.

2. A high-density powder bed spreading device according to claim 1, characterized in that: Also includes: The first powder collecting tank, the second powder collecting tank and the gate plate; The first powder collecting trough, the second powder collecting trough and the gate plate are all arranged on a side of the equipment body away from the binder spraying module; Furthermore, the gate plate is located between the first powder collecting trough and the second powder collecting trough.

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