Round additive manufacturing process for preventing titanium alloy from cracking

Abstract

The invention relates to the technical field of additive manufacturing, in particular to a rounding additive manufacturing process for preventing titanium alloy cracking, which comprises the following steps: step 1, constructing a part model of a target part; the target part is provided with an edge, the part model is provided with an arc-shaped part enveloped by the side wall of the target part, and the arc-shaped part forms an edge margin of the target part; 2, adding a support to the constructed part model; thirdly, printing is conducted based on the part model; and fourthly, the printed part is subjected to linear cutting and machining, and a target part is obtained. The cylinders are arranged at the edges, the machining allowance of the edges is formed, the cracking risk is reduced during part printing, meanwhile, the edges can be obtained through later bench worker polishing after part forming, the machining allowance is only located at the edges, the blank size cannot be enlarged, follow-up machining treatment of the side face allowance is not needed, and the machining efficiency is improved. The process not only can ensure that the characteristics of the target part are not lost, but also can save the printing material cost.

Description

Technical Field

[0001] The invention relates to the technical field of additive manufacturing, and in particular to a circumferential additive manufacturing process for preventing titanium alloy from cracking. Background Art

[0002] Titanium alloys are widely used in aerospace, medical equipment, and automobile manufacturing due to their excellent mechanical properties and good corrosion resistance. With the development of additive manufacturing, the design of titanium alloy parts is more free, and the part structure has more additive manufacturing characteristics. Titanium alloy additive manufacturing technology is becoming an efficient and low-cost option.

[0003] In the process of additive manufacturing of titanium alloys, easy cracking during printing is a difficult-to-solve characteristic. The risk of cracking exists during the molding process, cooling after printing, and post-processing, causing huge cost losses and adding obstacles to the advancement of additive manufacturing of titanium alloys.

[0004] like Figure 1 As shown, the existing titanium alloy process is direct printing, which is very easy to produce edge cracks and cause scrap.

[0005] like Figure 2 As shown in the figure, the improved process, in which the rounded corners transition at the edges of the parts, can only reduce the risk of cracking, and the rounded corners lose the edge features. In order to ensure the size, the size of the part blank needs to be enlarged, resulting in increased printing costs and difficulties in post-processing.

[0006] Therefore, the existing process has high printing costs, great risks, and high post-processing difficulty, and the process needs to be further optimized. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a circumferential additive manufacturing process for preventing titanium alloy cracking. By arranging a cylinder at the edge, a machining allowance for the edge is formed, thereby reducing the risk of cracking when the part is printed. At the same time, the edge can be obtained by subsequent bench grinding after the part is formed, and the machining allowance is only at the edge and will not expand the size of the blank. There is no need for subsequent processing of the side allowance. This process can not only ensure that the target part features are not lost but also save the cost of printing materials.

[0008] The objective of the present invention is achieved through the following technical solutions: A circumferential additive manufacturing process for preventing titanium alloy cracking comprises the following steps: Step 1, constructing a part model of a target part; the target part has an edge, and the part model is provided with an arc portion enclosed by a side wall of the target part, and the arc portion forms an edge margin of the target part; Step 2: Add support to the constructed part model; Step 3: Printing based on the part model; Step 4: Perform wire cutting and machining on the printed parts to obtain the target parts.

[0009] Furthermore, the arc-shaped portion is a cylinder or an elliptical cylinder.

[0010] Furthermore, the arc-shaped portion is a cylinder, and the diameter of the arc-shaped portion is tangent to the vertex of the target part.

[0011] Furthermore, the radius of the arc portion is 1mm-10mm.

[0012] Furthermore, in step 2, the support includes a rib plate, and the rib plate is arranged at the bottom of the target part where the base plate is attached.

[0013] Furthermore, the rib plate has a thickness of 3 mm to 10 mm.

[0014] Furthermore, the edges of the rib plate are smoothly transitioned.

[0015] Furthermore, a notch is provided at the bottom of the part model, and the notch is used to release stress during the printing cooling and wire cutting process of the target part.

[0016] Furthermore, the notch radius is 0.5 mm-2 mm.

[0017] Furthermore, in step four, the machining is grinding.

[0018] The beneficial effects of the present invention are: 1) The present invention provides a cylinder at the edge to form a machining allowance at the edge, thereby reducing the risk of cracking when printing parts. At the same time, the edge can be obtained by subsequent bench grinding after the part is formed, and the machining allowance is only at the edge and will not expand the size of the blank. There is no need for subsequent processing of the side allowance. This process can not only ensure that the target part features are not lost but also save the cost of printing materials.

[0019] 2) At the same time, the present invention provides a notch at the bottom of the part model. After the part is printed and formed, its bottom is not completely connected to the substrate. The provided notch can release stress during the printing cooling and wire cutting process. At the same time, during wire cutting separation, only the part part needs to be separated, which greatly shortens the wire cutting time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a model diagram of titanium alloy printed parts in the prior art; Figure 2 A model diagram of titanium alloy printed parts after improved process in the prior art; Figure 3 A part model diagram of the round-wrapped additive manufacturing process for preventing titanium alloy cracking in this embodiment; Figure 4 This is the bottom view of the part model; Figure 5 It is a three-dimensional diagram of the parts model; In the figure, 1. part model; 2. edge; 3. arc-shaped part; 4. support; 5. notch. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] See also Figure 3-Figure 5 , the present invention provides a technical solution: Example: like Figure 3-Figure 5 As shown, a circumferential additive manufacturing process for preventing titanium alloy cracking, the circumferential additive manufacturing process for preventing titanium alloy cracking comprises the following steps: Step 1, constructing a part model 1 of a target part; the target part has an edge 2, and the part model 1 is provided with an arc portion 3 enclosed by a side wall of the target part, and the arc portion 3 forms a margin of the edge 2 of the target part; The arc portion 3 is a cylinder or an elliptical cylinder. In this embodiment, the arc portion 3 is a cylinder, and the diameter of the arc portion 3 is tangent to the vertex of the target part (here, the vertex tangent means that the vertex coincides with the diameter of the arc portion. In this embodiment, the vertex is the center of the cylinder when the arc portion is a cylinder). The radius of the arc portion 3 is 1mm-10mm.

[0023] Step 2: Add support 4 to the constructed part model 1; in step 2, the support 4 includes a rib plate, which is arranged at the bottom of the target part where the base plate is attached. The thickness of the rib plate is 3mm-10mm. The edge 2 of the rib plate is rounded (here, the rounded transition refers to the rounding treatment of the edge 2 of the rib plate).

[0024] The bottom of the part model 1 is provided with a notch 5, which is used to release the stress of the target part during printing cooling and wire cutting. The radius of the notch 5 is 0.5mm-2mm.

[0025] Step 3: Printing based on the part model 1; Step 4: Perform wire cutting and grinding on the printed parts to obtain the target parts.

[0026] The present invention forms a machining allowance at the edge by arranging a cylinder at the edge, thereby reducing the risk of cracking when printing the part. At the same time, the edge can be obtained by subsequent bench grinding after the part is formed, and the machining allowance is only at the edge and will not expand the size of the blank. There is no need for subsequent processing of the side allowance. This process can not only ensure that the target part features are not lost but also save the cost of printing materials.

[0027] At the same time, the present invention provides a notch at the bottom of the part model. After the part is printed and formed, its bottom is not completely connected to the substrate. The provided notch can release stress during printing cooling and wire cutting processes. At the same time, during wire cutting separation, only the part part needs to be separated, which greatly shortens the wire cutting time.

[0028] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A circumferential additive manufacturing process for preventing titanium alloy cracking, characterized in that: The steps include: Step 1, constructing a part model of a target part; the target part has an edge, and the part model is provided with an arc portion enclosed by a side wall of the target part, and the arc portion forms an edge margin of the target part; Step 2: Add support to the constructed part model; Step 3: Printing based on the part model; Step 4: Perform wire cutting and machining on the printed parts to obtain the target parts.

2. The process for preventing titanium alloy cracking according to claim 1 is characterized in that: The arc-shaped portion is a cylinder or an elliptical cylinder.

3. The process for preventing titanium alloy cracking by rounding according to claim 2 is characterized in that: The arc-shaped portion is a cylinder, and the diameter of the arc-shaped portion is tangent to the vertex of the target part.

4. The process for preventing titanium alloy cracking by rounding according to claim 3 is characterized in that: The radius of the arc portion is 1mm-10mm.

5. The process for preventing titanium alloy cracking by rounding according to claim 1 is characterized in that: In step 2, the support includes a rib plate, and the rib plate is arranged at the bottom of the target part where the base plate is attached.

6. The process for preventing titanium alloy cracking by rounding according to claim 5 is characterized in that: The thickness of the rib plate is 3mm-10mm.

7. The process for preventing titanium alloy cracking by rounding additive manufacturing according to claim 5 or 6, characterized in that: The edges of the rib plate are smoothly transitioned.

8. The process for preventing titanium alloy cracking by rounding according to claim 1 is characterized in that: A notch is provided at the bottom of the part model, and the notch is used to release the stress of the target part during printing cooling and wire cutting.

9. The process for preventing titanium alloy cracking by rounding according to claim 8 is characterized in that: The notch radius is 0.5mm-2mm.

10. The process for preventing titanium alloy cracking by rounding additive manufacturing according to claim 1, characterized in that: In step 4, the machining is grinding.

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