Control method for cracking at joint of closing-up structure of additive manufacturing aluminum alloy component
By generating auxiliary sheets at the characteristic boundaries of the closing structure and using them in the laser selection melting forming technology, the problem of cracking at the closing structure connections of components such as AlSi10Mg integrated valve seat is solved, and high-quality and low-cost rapid production is achieved.
Patent Information
- Application Number
- CN202411694117.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-03-28
AI Technical Summary
In laser selection melting forming technology, cracks appear at the closing structure connections of components such as AlSi10Mg integrated valve seats due to shrinkage stress on both sides during sintering, resulting in scrapping of parts.
A certain thickness of auxiliary sheet is generated at the boundary of the closing structure feature, so that it extends as a solid body of the closing structure feature, closes both sides of the closing structure feature, and reduces the stress of the parts during annealing and line cutting, and finally removes the auxiliary sheet by manual or mechanical processing.
By adding auxiliary sheets, cracking defects at the junction of the closing structure are transferred to the auxiliary sheets, avoiding cracking of the parts body, and rapid production of high-quality AlSi10Mg integrated valve seats and other components is achieved.
Smart Images
Figure CN119703122A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of laser selective melting forming 3D printing, and specifically relates to a method for controlling cracking at a joint of a closing structure of an additively manufactured aluminum alloy component. Background Art
[0002] With the rapid advancement of model tasks in the aviation field, higher requirements are placed on manufacturing processes - fewer manufacturing processes, short production cycles, and low costs. The traditional manufacturing method for components such as aluminum alloy mounting valve seats in the oil circuit system of aircraft is mainly based on casting processes, which use a lot of molds and tooling, have high processing costs, and long manufacturing cycles. However, the development cycle of new aircraft models is short and the batch size is small, and traditional casting processes are more difficult to deal with this problem. At the same time, the demand for weight reduction of model aircraft is increasing, and components such as mounting valve seats are developing in the direction of integration. More and more integrated valve seats are designed, manufactured, and applied. Faced with the integrated development trend of mounting valve seats with complex cavities, traditional casting processes are becoming increasingly difficult to adapt. The emergence of additive manufacturing technology has effectively solved the above problems and can achieve rapid prototyping of small batches, low costs, and complex components. Laser selective melting technology is the most widely used processing technology in the field of additive manufacturing. At present, laser selective melting technology has achieved the replacement of production processes for aviation components of various materials and structures.
[0003] However, laser selective melting technology is used to produce AlSi 10 There are also some process challenges when integrating components such as valve seats with Mg. 10 The Mg integrated valve seat closing structure has cracks at the joint of the closing structure due to shrinkage stress on both sides during the sintering process, and the cracks extend into the interior of the entity, further leading to the scrapping of the entire component. The closing structure is a structural feature of holes, holes, grooves, etc. at any placement angle in three-dimensional space (except horizontal placement). During the printing process, there are two independent sintering areas, which gradually merge into an integral sintering area as the printing height increases. This patent uses laser selective melting forming technology to produce AlSi 10 Mg integrated valve seats and other components, from the perspective of structural optimization, avoid cracking defects at the joints of the component closing structure, and achieve rapid production of low-cost, high-quality AlSi 10 Mg integrated valve seat and other components, for this purpose, the present invention proposes a method for controlling cracking at the connection of the closing structure of additively manufactured aluminum alloy components. Summary of the invention
[0004] The purpose of the present invention is to provide a method for controlling cracking at the joint of the closing structure of an additively manufactured aluminum alloy component, so as to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a method for controlling cracking at the joint of the closing structure of an additively manufactured aluminum alloy component, the specific steps of which include S1: model processing: generating an auxiliary thin sheet of a certain thickness at the boundary of the closing structure feature, so that the auxiliary thin sheet is used as a solid extension at the closing structure feature; the extension width is the width of the auxiliary thin sheet, and when the extension width is ≥ 0.5 times the width of the closing structure feature, the two sides of the closing structure feature can be closed; the lower side of the auxiliary thin sheet is smoothly connected to the lower side of the solid;
[0006] S2: Selective laser melting: The forming process parameters of the sheet are the same as those of the part;
[0007] S3: Annealing: Anneal the parts together with the substrate to reduce the overall stress of the parts and slow down the subsequent wire cutting deformation;
[0008] S4: Wire cutting: Wire cutting is used to separate the parts from the substrate after heat treatment;
[0009] S5: Support removal: manually remove the support of the part, and remove the auxiliary sheet by hand or mechanical processing;
[0010] S6: Surface treatment: After the parts are de-supported, they are surface treated as required to obtain the final product.
[0011] Preferably, the distance between the auxiliary sheet and the entity is 0 mm.
[0012] Preferably, the auxiliary sheet is AlSi 10 Mg auxiliary sheet.
[0013] Preferably, the auxiliary sheet has a thickness of ≥0.1 mm.
[0014] Preferably, the auxiliary sheet width is ≥ 0.2 mm.
[0015] Preferably, the closing structure includes but is not limited to holes, holes, and grooves.
[0016] Compared with the prior art, the present invention has the following beneficial effects: in the method of the present invention, an auxiliary sheet is added, so that the connection of the closing structure is moved out of the part body and transferred to the auxiliary sheet, and the auxiliary sheet has cracking defects, but the part body will not crack; the auxiliary sheet can also be used to seal the closing structure as a whole, so there is no problem of the connection being cracked by the shrinkage stress on both sides, the auxiliary sheet will not crack, and the part body will not crack;
[0017] This control method is applicable to high-quality additive manufacturing of various aluminum alloy components with closing structures; the auxiliary thin sheet structure of this method is simple in design and easy to remove, and cracks can be removed from the part body, and a fully enclosed auxiliary thin sheet can also be designed to completely avoid cracking; the problem of cracking at the connection of the closing structure of aluminum alloy components in additive manufacturing is solved, so that the additive manufacturing process can achieve rapid production of low-cost, high-quality aluminum alloy integrated structures. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0020] Example 1
[0021] See also Figure 1 , which is the first embodiment of the present invention, and provides a technical solution: a method for controlling cracking at the joint of the closing structure of an additively manufactured aluminum alloy component, and the specific steps include S1: model processing: generating an auxiliary thin sheet of a certain thickness at the boundary of the closing structure feature, so that the auxiliary thin sheet is used as a solid extension at the closing structure feature; the extension width is the width of the auxiliary thin sheet, and when the extension width is ≥ 0.5 times the width of the closing structure feature, the two sides of the closing structure feature can be closed; the lower side of the auxiliary thin sheet is smoothly connected to the lower side of the entity;
[0022] S2: Selective laser melting: The forming process parameters of the sheet are the same as those of the part;
[0023] S3: Annealing: Anneal the parts together with the substrate to reduce the overall stress of the parts and slow down the subsequent wire cutting deformation;
[0024] S4: Wire cutting: Wire cutting is used to separate the parts from the substrate after heat treatment;
[0025] S5: Support removal: manually remove the support of the part, and remove the auxiliary sheet by hand or mechanical processing;
[0026] S6: Surface treatment: After the parts are de-supported, they are surface treated as required to obtain the final product.
[0027] In this embodiment, preferably, the distance between the auxiliary sheet and the entity is 0 mm.
[0028] In this embodiment, preferably, the auxiliary sheet is AlSi 10 Mg auxiliary sheet.
[0029] In this embodiment, preferably, the auxiliary sheet has a thickness of ≥0.1 mm.
[0030] In this embodiment, preferably, the width of the auxiliary sheet is ≥ 0.2 mm.
[0031] In this embodiment, preferably, the closing structure includes but is not limited to holes, holes, and grooves.
[0032] Although embodiments of the present invention have been shown and described (see the above detailed description for details), it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A method for controlling cracking at the joint of the closing structure of an additively manufactured aluminum alloy component, characterized in that: The specific steps include S1: model processing: generating an auxiliary sheet of a certain thickness at the boundary of the closing structure feature, and allowing the auxiliary sheet to be used as an extension of the entity at the closing structure feature; the extension width is the width of the auxiliary sheet, and when the extension width is ≥ 0.5 times the width of the closing structure feature, the two sides of the closing structure feature can be closed; the lower side of the auxiliary sheet is smoothly connected to the lower side of the entity; S2: Laser selective melting forming: the forming process parameters of the sheet are the same as those of the part; S3: Annealing: Anneal the parts together with the substrate to reduce the overall stress of the parts and slow down the subsequent wire cutting deformation; S4: Wire cutting: Wire cutting is used to separate the parts from the substrate after heat treatment; S5: Support removal: manually remove the support of the part, and remove the auxiliary sheet by hand or mechanical processing; S6: Surface treatment: After the parts are de-supported, they are surface treated as required to obtain the final product.
2. The method for controlling cracking at the joint of the closing structure of an additively manufactured aluminum alloy component according to claim 1, characterized in that: The distance between the auxiliary sheet and the entity is 0 mm.
3. The method for controlling cracking at the joint of the closing structure of an additively manufactured aluminum alloy component according to claim 1, characterized in that: The auxiliary sheet is AlSi 10 Mg auxiliary sheet.
4. The method for controlling cracking at the joint of the closing structure of an additively manufactured aluminum alloy component according to claim 1, characterized in that: The thickness of the auxiliary sheet is ≥0.1 mm.
5. The method for controlling cracking at the joint of the closing structure of an additively manufactured aluminum alloy component according to claim 1, characterized in that: The auxiliary sheet has a width of ≥0.2 mm.
6. The method for controlling cracking at the joint of the closing structure of an additively manufactured aluminum alloy component according to claim 1, characterized in that: The closing structure includes but is not limited to holes, holes, and grooves.