CN115194179A

CN115194179A - Support structure and method for manufacturing spiral pipeline

Info

Publication number: CN115194179A
Application number: CN202110398849.9A
Authority: CN
Inventors: 田晓飞; 王威; 刘晓之
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2022-10-18
Anticipated expiration: 2041-04-12

Abstract

The invention discloses a support structure member and a manufacturing method of a spiral pipeline, wherein the support structure member is used for selective laser melting forming of the spiral pipeline and comprises a solid support body and a grid support body, the solid support body is arranged on the inner side of the spiral pipeline and extends along the axial direction of the spiral pipeline, the periphery of the solid support body is provided with a spiral support part which is spirally surrounded, and a spiral groove is formed on the spiral support part and is used for accommodating the spiral pipeline; the grid supporting body is arranged in the spiral groove, the grid supporting body and the spiral pipeline are formed together, and the grid supporting body is used for connecting and supporting the spiral pipeline. When the selective laser melting forming of the spiral pipeline is carried out, the solid support body and the grid support body are arranged to provide enough support strength for the spiral pipeline, the spiral pipeline can be pulled in the axial direction, the deformation of the spiral pipeline in the axial direction after the support is removed is effectively reduced, and the yield of the spiral pipeline is improved.

Description

Support structure and method for manufacturing spiral pipeline

Technical Field

The invention relates to the technical field of laser melting forming, in particular to a manufacturing method of a supporting structural part and a spiral pipeline.

Background

At present, small-channel pipelines (pipe diameters generally in the range of 1.5mm < <5 mm) are widely used in a variety of fields, for example, heat exchangers for exchanging heat between fluids, heat exchange in the field of household equipment such as air conditioners, refrigerators and purifiers, and heat exchange in the industrial fields such as oil pipelines, ships and aircraft engine fuel pipelines. Under special conditions (such as coking pipelines of aero-engines), in order to test the heat exchange performance of small-channel pipelines, the long diameter of the pipelines is required to be large, in order to reduce the space occupation, the pipelines are usually designed into a spiral shape, and under special conditions, the circulation cross section of the pipelines is required to be special-shaped (such as ellipses and rhombuses). For small-channel spiral pipelines or common bent pipelines, a hollow pipeline is obtained by a common drawing process and then is wound or bent. The method has the advantages of complex process, low production efficiency and high production cost, and can be influenced by various adverse effects of uneven pipe material, unstable drawing force, uncontrollable stability of a moving core head, unstable processing equipment, environment and lubricating conditions and the like, so that the obtained pipeline has low dimensional accuracy of the inner diameter and the outer diameter, low yield, easy deformation and cracking of the wound spring, difficult size control and the like.

Additive manufacturing, also called 3D printing, is a manufacturing technology for realizing part forming by layer-by-layer superposition of raw material powder based on a discrete accumulation principle. The selective laser melting technology is one of additive manufacturing technologies, and the selective laser melting technology is used for forming parts based on a powder bed layer-by-layer powder laying mode and a laser layer-by-layer scanning mode, has very high forming freedom degree, and can form parts with any complex structures almost, particularly parts with complex inner cavity structures. For the spring pipeline with the special-shaped section, a special tool is not required to be designed, printing can be directly carried out, the production period and the cost are greatly shortened, and the printed part is high in size precision and good in mechanical property.

The method is characterized in that a selective laser melting technology is used for printing, particularly parts which are complex and easy to deform in a cantilever structure and the like, a supporting structural part needs to be added to an initial model to form a printing model, and the supporting structural part and the parts are formed simultaneously when a forming step is carried out so as to ensure that the parts do not deform in the forming process. After the forming step is completed, the support structure needs to be removed. In the prior art, the form of the supporting structural member includes a grid support and a solid support. Because the distance between adjacent spiral sections of the spiral pipeline is very small, the support structural member is difficult to remove after being added, and the specific axial elastic deformation of the spiral pipeline needs to be controlled, so that the support structural member is prevented from generating large elastic deformation after being removed. Therefore, it is desirable to provide a support structure formed by selective laser melting of a spiral pipeline and a method for removing the support structure, so that the support structure is easy to remove and the forming quality of the spiral pipeline is ensured.

Disclosure of Invention

The invention aims to solve the technical problem that when a spiral pipeline is manufactured by adopting laser melting forming in the prior art, the support structural member is easy to elastically deform the spiral pipeline when removed, and provides the support structural member and the manufacturing method of the spiral pipeline.

The invention solves the technical problems through the following technical scheme:

the invention provides a supporting structure member for selective laser melting forming of a spiral pipeline, which comprises a solid supporting body and a grid supporting body, wherein the solid supporting body is arranged on the inner side of the spiral pipeline and extends along the axial direction of the spiral pipeline;

the grid support body is arranged in the spiral groove, the grid support body and the spiral pipeline are formed together, and the grid support body is used for connecting and supporting the spiral pipeline.

In this scheme, when carrying out the selective laser melting of spiral pipeline and forming, provide sufficient support intensity for spiral pipeline through setting up entity supporter and net supporter, can hold spiral pipeline in the axial, the effectual reduction goes to support back spiral pipeline at axial deflection, has improved spiral pipeline's yield.

Preferably, the helix parameter of the helical support part is the same as the helix parameter of the helical pipeline.

In this scheme, the helix parameter setting of the spiral supporting part of entity supporter is the same with the helix parameter of spiral pipeline to for the grid supporter of whole spiral pipeline along the journey section provides even, the sufficient support of intensity, further reduced to go to support back spiral pipeline at axial deflection.

Preferably, the grid support body is a linear structure, one end of the linear structure is connected with the spiral pipeline, and the other end of the linear structure is connected with the spiral support part; or the like, or, alternatively,

one end of part of the linear structure is connected with the spiral pipeline, and the other end of the linear structure is connected with the spiral supporting part; two ends of part of the linear structure are respectively connected with two adjacent pipe body sections of the spiral pipeline in height.

In this scheme, through the spiral support portion and the spiral pipeline of grid supporter connection entity supporter or connect two adjacent pipe body sections of spiral pipeline in height, not only can provide the support for the spiral pipeline, make at the spiral pipeline moreover and accomplish the convenient back and get rid of, can not exert an influence to the structure of spiral pipeline.

Preferably, the two ends of the spiral pipeline are respectively provided with an inlet joint and an outlet joint;

the entity supporter still includes supporting subject and base, the supporting subject is located the up end of base, be equipped with the powder blowing mouth on the base, the powder blowing mouth is established on the powder blowing mouth supporter, the powder blowing mouth be used for with the access connection or the exit linkage intercommunication.

In this scheme, set up the powder blowing mouth on bearing structure spare, blow off the inside remaining powder of spiral pipeline by the powder blowing mouth after being convenient for take shape, prevent that remaining powder from leading to the stifled hole with the internal face adhesion of spiral pipeline after the follow-up thermal treatment, influencing the quality of spiral pipeline.

Preferably, the side wall of the base is provided with a notch, and the powder blowing port supporting body is arranged in the notch.

In this scheme, set up the breach on the lateral wall of base and establish the powder blowing port supporter in the breach, conveniently be connected spiral pipeline's access connection or outlet connection and powder blowing port.

Preferably, the spiral supporting part has an upper end surface, the upper end surface is located below the spiral pipeline in the spiral groove, and the grid supporting body is arranged between the upper end surface and the spiral pipeline.

In this scheme, adopt above-mentioned structural style, avoid just taking shape the spiral pipeline flagging under the action of gravity and producing the deformation.

Preferably, the minimum distance between the spiral pipeline and the upper end face is not less than 2mm.

In this scheme, conveniently have sufficient space to generate the net supporter when generating the spiral pipeline, also conveniently have sufficient space to get rid of the net supporter after the spiral pipeline takes shape.

Preferably, the spiral support has a lower end surface located above the spiral pipe in the spiral groove, and the lower end surface is disposed obliquely upward from the outer surface of the solid support.

In this scheme, adopt above-mentioned structural style, strengthen the support intensity of the spiral support portion of entity support body.

Preferably, the lower end face is provided with a groove, the spiral pipeline part is positioned in the groove, and a gap is formed between the surface of the groove and the surface of the spiral pipeline.

In this scheme, adopt above-mentioned structural style, can be too little at spiral pipeline's pitch for spiral pipeline and spiral support portion have as big space as possible and set up the net supporter, avoid the difficult later stage of space undersize of net supporter to get rid of.

Preferably, the inclination angle of the lower end surface is not less than 30 °.

In this scheme, the spiral supporting part of the solid support body is ensured to have sufficient supporting strength.

Preferably, the solid support comprises a first support part, a plurality of second support parts and a limiting part, the first support part and the plurality of second support parts are arranged at intervals in the circumferential direction and enclose an annular structure, wherein two opposite side surfaces of the first support part and the second support part are arranged in parallel;

the limiting part is arranged in the annular structure, and the first supporting part and the plurality of second supporting parts are respectively connected with the limiting part; or the like, or, alternatively,

the limiting part is arranged in the annular structure, and the first supporting part and the plurality of second supporting parts are arranged in a separated mode between the limiting part and the second supporting part.

In this scheme, adopt above-mentioned structural style, divide into a plurality of structural part with the entity supporter, can conveniently take out it after the spiral tube body takes shape.

Preferably, the restriction part is of a cylindrical structure.

In this scheme, the barrel construction is adopted to the restriction portion, can save material, reduction in production cost.

The invention also provides a manufacturing method of the spiral pipeline, the spiral pipeline is manufactured by selective laser melting forming, and the manufacturing method comprises the following steps:

s1, establishing a forming model of the spiral pipeline according to the structure of the spiral pipeline, and establishing the forming model of the support structural member;

s2, carrying out selective laser melting forming according to the forming model of the spiral pipeline and the forming model of the supporting structural member to obtain a primary formed piece;

and S3, removing the supporting structural member on the primary forming member to obtain a finished product of the spiral pipeline.

In the scheme, the spiral pipeline is processed by adopting the selective laser melting forming manufacturing method, compared with the traditional process, the process is simple, the yield is high, the processing period is short, the production cost is reduced, and the method is particularly suitable for small-batch production of spring pipelines. And moreover, the supporting structural member with a spiral structure is adopted in the manufacturing process, so that the supporting strength of the whole spiral pipeline along the way is uniform and reliable, the deformation of the spiral pipeline in the axial direction after the support is removed is effectively reduced, and the quality and the yield of finished products of the spiral pipeline are improved.

Preferably, in step S1, the grid support is automatically generated by professional support generation software, and the structure of the grid support is locally adjusted according to the structural characteristics of the spiral pipeline, and then layered slicing is performed.

In the scheme, the method is convenient and quick, and the workload is effectively reduced.

Preferably, the support generation software selects Magics and the hierarchical slice processing software selects Rp-tools.

Preferably, in step S2, the spiral pipeline and the support structure are synchronously subjected to selective laser melting forming.

In the scheme, the method can provide support for the newly generated spiral pipeline in real time, and meanwhile improves production efficiency.

the limiting part is arranged in the annular structure, and the first supporting part and the plurality of second supporting parts are respectively connected with the limiting part;

in step S3, removing the support structure from the preliminary formed part comprises the following steps:

s31, knocking off the grid support body along a spiral line one by one;

s32, cutting off the limiting part in a linear cutting mode and taking out the limiting part to form a central space;

and S33, pushing the first supporting part to the central space, then drawing out the first supporting part from the central space, and then drawing out the second supporting parts.

In this scheme, the net supporter is got rid of earlier in the adoption, gets rid of the inside entity supporter of spiral pipeline again, can utilize the supporting role of inside entity supporter, avoids getting rid of the in-process of net supporter, and external effort can not lead to the spiral pipeline to warp.

Preferably, the solid support comprises a first support part, a plurality of second support parts and a limiting part, the first support part and the plurality of second support parts are arranged at intervals in the circumferential direction and enclose an annular structure, and two opposite side surfaces of the first support part and the second support part are arranged in parallel;

the limiting part is arranged in the annular structure, and the first supporting part, the second supporting part and the limiting part are arranged separately;

s31, knocking off the grid support body along a spiral line one by one;

s32, pushing out the limiting part along the axial direction to form a central space;

The positive progress effects of the invention are as follows: when the selective laser melting forming of the spiral pipeline is carried out, the solid support body and the grid support body are arranged to provide enough support strength for the spiral pipeline, the spiral pipeline can be pulled in the axial direction, the deformation of the spiral pipeline in the axial direction after the support is removed is effectively reduced, and the yield of the spiral pipeline is improved.

Drawings

Fig. 1 is a schematic structural view of a spring pipeline in embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a solid support in embodiment 1 of the present invention.

Fig. 3 is a cross-sectional view of fig. 2.

FIG. 4 is a bottom view of the solid support of FIG. 2 with the powder blowing ports removed.

Fig. 5 is a schematic view of the spring tube and the supporting structural member in the embodiment 1 of the present invention.

FIG. 6 is a schematic view of the spring tube of FIG. 5 from another perspective in cooperation with a support structure.

Fig. 7 is a cross-sectional view of fig. 5.

Fig. 8 is a detailed view of the spring tube and the supporting structural member partially engaged with each other in embodiment 1 of the present invention.

Fig. 9 is a flowchart of manufacturing the spring tube in embodiment 1 of the present invention.

Fig. 10 is a schematic structural diagram of a solid support in embodiment 2 of the present invention.

Fig. 11 is a cross-sectional view of fig. 10.

Fig. 12 is a detail view of the spring tube and the supporting structural member partially engaged in embodiment 2 of the present invention.

Fig. 13 is a schematic structural diagram of a solid support in embodiment 3 of the present invention.

FIG. 14 is a bottom view of the solid support of FIG. 13 with the powder blowing ports removed.

Fig. 15 is a cross-sectional view of fig. 13.

Fig. 16 is a schematic view of the spring tube and the supporting structural member in embodiment 3 of the present invention.

Description of the reference numerals:

spring line 100

Inlet fitting 101

Outlet fitting 102

Solid support 200

Support body 210

Spiral support portion 211

Upper end surface 2111

Lower end surface 2112

Helical groove 212

Groove 213

Base 220

Notch 221

Powder blowing port support 222

First support part 201

Second support part 202

Connecting structure ring 203

Core rod 204

Grid support 300

Detailed Description

The invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, without thereby limiting the scope of the invention to these examples.

Example 1

Referring to fig. 1, a spiral tube to be manufactured by selective laser melting forming according to the present embodiment is a small channel spring tube 100. The inner diameter of the spring tube 100 may be 0.2-0.3mm, and the two ends of the spring tube 100 are respectively provided with an inlet joint 101 and an outlet joint 102. Because the spring pipeline 100 is all suspended surfaces along the way, a supporting structural member needs to be added to the suspended surfaces in the selective laser melting forming process.

As shown in fig. 2-8, a support structure designed for the spring tube 100 of this embodiment is used for selective laser melting of the spring tube 100. The support structure includes a solid support 200 and a mesh support 300.

The solid support 200 is disposed inside the spring tube 100 and extends along the axial direction of the spring tube 100, the solid support 200 has a spiral support 211 spirally wound on the outer circumference thereof, the spiral support 211 is formed with a spiral groove 212, and the spiral groove 212 is used for accommodating the spring tube 100.

The grid support 300 is disposed in the spiral groove 212, the grid support 300 is formed together with the spring tube 100, and the grid support 300 is used for connecting and supporting the spring tube 100.

In this embodiment, when the selective laser melting forming of the spring pipeline 100 is performed, the solid support 200 and the grid support 300 are arranged to provide sufficient support strength for the spring pipeline 100, so that the spring pipeline 100 can be pulled in the axial direction, the deformation of the spring pipeline 100 in the axial direction after the support is removed is effectively reduced, and the yield of the spring pipeline 100 is improved.

In this embodiment, the helix parameters of helical support portion 211 are the same as the helix parameters of spring tube 100. The spiral line parameters of the spiral supporting part 211 of the solid supporting body 200 are set to be the same as those of the spring pipeline 100, so that the uniform and strong enough support is provided for the grid supporting body 300 of the whole spring pipeline 100 along the section, and the deformation of the spring pipeline 100 in the axial direction after the support is removed is further reduced.

Of course, in other embodiments, the helical parameters of helical support portion 211 may not be the same as the helical parameters of spring tube 100, but may not affect the support of spring tube 100.

In this embodiment, the spring tube 100 is completely located in the spiral groove 212, the grid support 300 is a linear structure, one end of the linear structure is connected to the spring tube 100, and the other end of the linear structure is connected to the spiral support 211. The spiral supporting part 211 of the solid supporting body 200 and the spring pipeline 100 are connected through the grid supporting body 300, which not only can provide support for the spring pipeline 100, but also can be removed conveniently after the spring pipeline 100 is manufactured, and does not affect the structure of the spring pipeline 100.

In other embodiments, if the spring tube 100 is not completely located in the spiral groove 212, but partially located outside the spiral groove 212, one end of the partial linear structure in the grid support 300 is connected to the spring tube 100, the other end is connected to the spiral support 211, and two ends of the partial linear structure are respectively connected to two tube segments of the spring tube 100 adjacent to each other in height.

In other embodiments, the lattice support 300 may also be of other structural types, such as a cross-shaped fish net structure or a honeycomb structure, and the specific structure is not limited herein.

In this embodiment, as shown in fig. 2-7, the solid support 200 further includes a support body 210 and a base 220, the support body 210 is located on an upper end 2111 of the base 220, the base 220 is provided with a powder blowing port, the powder blowing port is provided on a powder blowing port support 222, and the powder blowing port is used for communicating with the outlet connector 102. Through set up the powder blowing mouth on the supporting structure spare, blow off the remaining powder in the spring pipeline 100 by the powder blowing mouth after being convenient for take shape, prevent that remaining powder from leading to the stifled hole with the internal face adhesion of spring pipeline 100 after the follow-up thermal treatment, influence the quality of spring pipeline 100.

Since the inlet joint 101 and the outlet joint 102 at the two ends of the spring pipeline 100 can be selected according to the requirement, the inlet joint 101 can be communicated with the powder blowing port.

As shown in fig. 2, 5 and 6, the sidewall of the base 220 has a notch 221, and the powder blowing port support 222 is disposed in the notch 221. The notch 221 is formed in the side wall of the base 220, and the powder blowing port support 222 is disposed in the notch 221, so that the outlet connector 102 of the spring pipeline 100 can be conveniently connected with the powder blowing port.

The base 220 is in contact with the substrate of the selective laser melting forming device, and the base 220 is in a cylindrical structure and has a diameter larger than the outer diameter of the spiral line of the spring pipeline 100.

As shown in fig. 7 and 8, the spiral support portion 211 has an upper end surface 2111, the upper end surface 2111 is located below the spring tube 100 in the spiral groove 212, and a lattice support 300 is provided between the upper end surface 2111 and the spring tube 100. By adopting the structure form, the just-formed spring pipeline 100 is prevented from sagging under the action of gravity to generate deformation.

The support structure of the present embodiment is suitable for the case where the pitch of the spring tube 100 is large, for example, the pitch is not less than 5mm. In this embodiment, the minimum spacing of the spring tube 100 from the upper end face 2111 is no less than 2mm. It is convenient to have enough space to produce the mesh support 300 while producing the spring tube 100, and it is also convenient to have enough space to remove the mesh support 300 after the spring tube 100 is formed. Of course, in other embodiments, the distance between the spring tube 100 and the upper end surface 2111 may be smaller than 2mm, and the design is reasonable according to the pitch of the spring tube 100.

As shown in fig. 7 and 8, the spiral support portion 211 further has a lower end surface 2112, the lower end surface 2112 is located above the spring tube 100 in the spiral groove 212, and the lower end surface 2112 is disposed obliquely upward from the outer surface of the solid support 200. The inclination angle of the lower end surface 2112 is not less than 30 °, and 30 ° in this embodiment, ensuring sufficient support strength of the spiral support portion 211 of the solid support 200.

Of course, in other embodiments, the angle of inclination of the lower end surface 2112 may be smaller than 30 °, which is not limited herein, as long as the spiral supporting portion 211 of the solid support 200 has sufficient supporting strength.

As shown in fig. 4 and 6, in the present embodiment, the solid support 200 includes a first support 201, a plurality of second supports 202, and a limiting portion, the first support 201 and the plurality of second supports 202 are arranged at intervals in the circumferential direction and enclose an annular structure, wherein two sides of the first support 201 opposite to the second supports 202 are arranged in parallel. The limiting portion is disposed in the annular structure, and the first supporting portion 201 and the plurality of second supporting portions 202 are connected to the limiting portion, respectively.

In the present embodiment, there is only one first support portion 201, similar to a rectangular structure, and there are a plurality of second support portions 202, similar to a fan-shaped structure. Here, the structure of the second supporting portion 202 is not exactly the same, and the second supporting portion 202 is referred to as a "second supporting portion" only for distinguishing from the first supporting member. The restriction is a connection structure ring 203 of a cylinder structure. The limiting part adopts a cylinder structure, so that materials can be saved, and the production cost is reduced.

In other embodiments, there may be a plurality of the first supporting portions 201. The restriction may also be of solid construction.

The connection structure ring 203 can strengthen the supporting strength of the plurality of second supporting parts 202 and the first supporting part 201, and avoid the scraper phenomenon caused by the supporting vibration under the large length-diameter ratio. The structure of the connection structure ring 203 is not limited to a circular ring shape.

The plurality of second support portions 202 are circumferentially spaced from one first support portion 201 by a circumferential distance of 0.2 to 0.3mm to facilitate removal of the support after the formation is completed. Compared with the design on the periphery of the spring pipeline 100, the solid support 200 is limited in the core of the spring pipeline 100 by the above cross section design, so that the loss of raw material powder can be effectively reduced, and the cost is reduced. Meanwhile, due to the design of the first supporting part 201 with the rectangular structure, in the later supporting process, the first supporting part 201 with the rectangular structure only needs to be pushed to the core rear shaft to move, the second supporting parts 202 with the rest fan-shaped structures can be automatically taken out, and the problem that the solid supporting body 200 is difficult to remove in the core design of the spring pipeline 100 is solved.

As shown in fig. 9, the present embodiment further provides a method for manufacturing a spring tube 100 by selective laser melting forming, the manufacturing method comprising the following steps:

s1, establishing a forming model of the spring pipeline 100 according to the structure of the spring pipeline, and establishing a forming model of a corresponding supporting structural part;

s2, carrying out selective laser melting forming according to the forming model of the spring pipeline 100 and the forming model of the supporting structural part to obtain a primary formed part;

and S3, removing the supporting structural member on the primary forming member to obtain a finished product of the spring pipeline 100.

In the embodiment, the spring pipeline 100 is processed by adopting the selective laser melting forming manufacturing method, compared with the traditional process, the process is simple, the yield is high, the processing period is short, the production cost is reduced, and the selective laser melting forming manufacturing method is particularly suitable for producing small-batch spring pipelines 100. Moreover, the support structure with a spiral structure is adopted in the manufacturing process, so that the support strength of the whole spring pipeline 100 along the process is uniform and reliable, the deformation of the spring pipeline 100 in the axial direction after the support is removed is effectively reduced, and the quality and the yield of the finished product of the spring pipeline 100 are improved.

In step S1 of this embodiment, the grid support 300 is automatically generated by professional support generation software, and the structure of the grid support 300 is locally adjusted according to the structural characteristics of the spring tube 100, and then the layered slicing process is performed. By adopting the method, the operation is convenient and fast, and the workload is effectively reduced. Wherein, the support generation software selects Magics, and the hierarchical slice processing software selects Rp-tools.

In step S2 of the present embodiment, the spring tube 100 is selectively laser-melted and formed in synchronization with the support structure. By adopting the method, the newly generated spring pipeline 100 can be supported in real time, and meanwhile, the production efficiency is improved.

In other embodiments, the solid support 200 may be formed first, and then the spring tubes 100 and the mesh support 300 may be formed simultaneously.

In this embodiment, since the first supporting portion 201 and the second supporting portion 202 are both fixedly connected to the limiting portion, in step S3, removing the supporting structure on the preliminary formed piece includes the following steps:

s31, knocking off the grid support body 300 along the spiral line one by one.

In specific implementation, the lattice support 300 is knocked off by a chisel along a spiral line one by one, and at this time, the solid support 200 and the spring pipeline 100 can rock, but the solid support 200 is arranged at the core part of the spring pipeline 100, and the maximum outer diameter of the solid support 200 is larger than the outer diameter of the spiral line of the spring pipeline 100, so that the solid support 200 cannot be taken out. Further, the spring is not deformed by the striking force of the chisel in the process of removing the mesh support 300 due to the supporting function of the internal solid support 200.

And S32, cutting off the connecting structure ring 203 in a linear cutting mode, and taking out to form a central space.

S33, the first support 201 is pushed into the central space and then pulled out from the central space, and then the plurality of second support 202 is pulled out.

In this embodiment, the grid support 300 is removed first, and then the solid support 200 inside the spring pipeline 100 is removed, so that the support effect of the internal solid support 200 can be utilized to avoid that the external acting force does not cause the deformation of the spring pipeline 100 in the process of removing the grid support 300.

In this embodiment, since the outlet connector 102 of the spring tube 100 is connected to the powder-blowing opening, the powder-blowing opening support 222 is cut off from the outlet connector 102 by wire cutting.

Example 2

As shown in fig. 10 to 12, the structure of the support structural member in the present embodiment is substantially the same as that of embodiment 1, except that: in this embodiment, the lower end surface 2112 of the spiral support portion 211 has a groove 213, the spring tube 100 is partially located in the groove 213, and a gap is formed between the surface of the groove 213 and the surface of the spring tube 100. The support structure of this embodiment is suitable for selective laser melt forming of spring tubes having a relatively small pitch, such as spring tubes 100 having a pitch of less than 5mm.

The groove 213 has an arc surface adapted to the spring pipeline 100, but the distance between the arc surface and the spring pipeline 100 is 0.2mm to 0.3mm. The spiral support portion 211 of this structure can limit the amount of deformation of the spring pipeline 100 in the axial direction, and avoid the excessive amount of deformation of the spring pipeline 100 in the axial direction caused by insufficient tensile strength of the grid support 300.

In this embodiment, with the above structure, when the thread pitch of the spring pipeline 100 is too small, the spring pipeline 100 and the spiral supporting portion 211 have a space as large as possible for arranging the grid supporting body 300, so as to avoid that the space of the grid supporting body 300 is too small and is not easy to be removed in a later period.

Example 3

As shown in fig. 13 to 16, the structure of the support structural member in the present embodiment is substantially the same as that of embodiment 1, except that: in the present embodiment, the restricting portion is a mandrel 204 having a cylindrical structure, and the first support portion 201 and the second support portion 202 are provided separately from the mandrel 204.

The distance between the mandrel bar 204 and the first and

second support portions

201 and 202 is 0.2 to 0.3mm. The core rod 204 can not only play a role in enhancing the supporting strength of the solid supporting body 200, but also be conveniently drawn out from the core part of the spring pipeline 100 after being formed and used for a mechanical property test rod, thereby effectively increasing the utilization rate of the formed powder and reducing the production cost. The core rod 204 may be a solid structure or a hollow structure.

Therefore, in this embodiment, in step S3, the step of removing the support structure on the preliminary formed piece is also different from that in embodiment 1, and mainly includes the following steps:

s31, the grid support 300 is knocked off along the spiral line one by one.

In specific implementation, the lattice support 300 is knocked off by a chisel along a spiral line one by one, and at this time, the solid support 200 and the spring pipeline 100 can rock, but the solid support 200 is arranged at the core part of the spring pipeline 100, and the maximum outer diameter of the solid support 200 is larger than the outer diameter of the spiral line of the spring pipeline 100, so that the solid support 200 cannot be taken out. Further, due to the supporting function of the internal solid support 200, the spring is not deformed by the striking force of the chisel in the process of removing the mesh support 300.

S32, the mandrel 204 is pushed out in the axial direction to form a central space. In this step, the mandrel 204 can be directly withdrawn without using a wire cutting method.

In this embodiment, by removing the mesh support 300 and then removing the solid support 200 inside the spring pipeline 100, the support effect of the internal solid support 200 can be utilized, and the situation that the spring pipeline 100 is not deformed by external acting force in the process of removing the mesh support 300 is avoided.

Also, in this embodiment, since the outlet connector 102 of the spring tube 100 is connected to the powder-blowing opening support, the powder-blowing opening support 222 is cut off from the outlet connector 102 by wire cutting.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. The selective laser melting forming method and the supporting structural member of the spiral pipeline are not limited to a spring pipeline, and any small channel and bent pipeline which are difficult to machine in the traditional process can adopt the manufacturing method provided by the invention. Various changes or modifications to these embodiments may be made by those skilled in the art without departing from the principle and spirit of this invention, and these changes and modifications are within the scope of this invention.

Claims

1. A supporting structure member for selective laser melting forming of a spiral pipeline is characterized in that: the supporting structure comprises an entity supporting body and a grid supporting body, the entity supporting body is arranged on the inner side of the spiral pipeline and extends along the axial direction of the spiral pipeline, the periphery of the entity supporting body is provided with a spiral supporting part which is spirally surrounded, a spiral groove is formed on the spiral supporting part, and the spiral groove is used for accommodating the spiral pipeline;

the grid supporting body is arranged in the spiral groove, the grid supporting body and the spiral pipeline are formed together, and the grid supporting body is used for connecting and supporting the spiral pipeline.

2. The support structure of claim 1, wherein the helical support portion has a helix parameter that is the same as a helix parameter of the helical conduit.

3. The support structure of claim 1, wherein the lattice support is a wire structure, one end of the wire structure being connected to the helical conduit and the other end of the wire structure being connected to the helical support; or the like, or a combination thereof,

one end of part of the linear structure is connected with the spiral pipeline, and the other end of the linear structure is connected with the spiral supporting part; two ends of part of the linear structures are respectively connected with two adjacent pipe body sections of the spiral pipeline in height.

4. The support structure of claim 1, wherein the spiral conduit has an inlet connection and an outlet connection at each end;

5. The support structure of claim 4, wherein the side wall of the base has a notch, and the powder-blowing port support is disposed in the notch.

6. The support structure of claim 1, wherein the helical support portion has an upper end surface that is located within the helical groove below the helical tube, the grid support being disposed between the upper end surface and the helical tube.

7. The support structure of claim 6, wherein the helical conduit has a minimum spacing from the upper end face of no less than 2mm.

8. The support structure of claim 1, wherein the helical support portion has a lower end surface located above the helical channel within the helical groove, the lower end surface being disposed obliquely upwardly outwardly from the outer surface of the solid support body.

9. The support structure of claim 8, wherein the lower end surface has a groove therein, the spiral conduit portion is located in the groove, and a gap is provided between a surface of the groove and a surface of the spiral conduit.

10. The support structure of claim 8, wherein the angle of inclination of the lower end face is not less than 30 °.

11. A support structure as claimed in claim 1, wherein the solid support comprises a first support, a plurality of second supports and a restraining portion, the first and second supports being circumferentially spaced and enclosing an annular formation, wherein two opposite sides of the first support are arranged in parallel with the second support;

the limiting part is arranged in the annular structure, and the first supporting part and the plurality of second supporting parts are respectively connected with the limiting part; or the like, or a combination thereof,

12. The support structure of claim 11, wherein the restraint is a cylindrical structure.

13. A method of manufacturing a helical pipe, said helical pipe being manufactured by selective laser fusion forming, said method comprising the steps of:

s1, establishing a forming model of the spiral pipeline according to the structure of the spiral pipeline, and establishing the forming model of the support structure member according to claim 1;

s2, carrying out selective laser melting forming according to the forming model of the spiral pipeline and the forming model of the supporting structural part to obtain a primary formed part;

14. The method for manufacturing a spiral pipe according to claim 13, wherein in step S1, the mesh support is automatically generated by a professional support generation software, and the structure of the mesh support is locally adjusted according to the structural characteristics of the spiral pipe, and then a layered slicing process is performed.

15. The method of manufacturing a spiral pipe as claimed in claim 14, wherein the support generation software selects Magics and the slice processing software selects Rp-tools.

16. The method of manufacturing a spiral pipe as claimed in claim 13, wherein in step S2, the spiral pipe is selectively laser melt-formed in synchronization with the support structure.

17. The method of manufacturing a spiral pipe as claimed in claim 13, wherein the solid support includes a first support portion, a plurality of second support portions and a restriction portion, the first support portion and the plurality of second support portions being circumferentially spaced and enclosing an annular structure, wherein two sides of the first support portion opposite to the second support portion are arranged in parallel;

s31, knocking off the grid support body along a spiral line one by one;

18. The method of manufacturing a spiral pipe as claimed in claim 13, wherein the solid support includes a first support portion, a plurality of second support portions and a restriction portion, the first support portion and the plurality of second support portions being circumferentially spaced and enclosing an annular structure, wherein two sides of the first support portion opposite to the second support portion are arranged in parallel;

s31, knocking off the grid support body along a spiral line one by one;