CN117773147A - SLM forming method of TC4 thin-wall guide cylinder - Google Patents
SLM forming method of TC4 thin-wall guide cylinder Download PDFInfo
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Abstract
The invention relates to the technical field of titanium alloy structural member forming, in particular to a forming method of a TC4 thin-wall guide cylinder SLM. The application provides a shaping method of a TC4 thin-wall guide cylinder SLM, which comprises the following steps: constructing an initial three-dimensional model of the TC4 thin-wall guide cylinder; setting a support for the initial three-dimensional model to form an intermediate three-dimensional model; adding a margin to the intermediate three-dimensional model to form a target three-dimensional model; 3D printing is carried out according to the target three-dimensional model so as to obtain a first blank; performing heat treatment on the first blank to obtain a second blank; and finishing the second blank to obtain the target TC4 thin-wall guide cylinder. According to the SLM forming method of the TC4 thin-wall guide cylinder, the TC4 thin-wall guide cylinder is formed in the mode of the SLM, the production efficiency of parts can be improved, the manufacturing cost is reduced, the accuracy and performance of the SLM forming can be effectively controlled through the design of the solid support and the design of the allowance adding scheme, the processing procedures after forming components are reduced, and accordingly the manufacturing period is shortened.
Description
Technical Field
The invention relates to the technical field of titanium alloy structural member forming, in particular to a forming method of a TC4 thin-wall guide cylinder SLM.
Background
The TC4 thin-wall guide cylinder component belongs to a typical thin-wall structural component, and has the advantages of high requirement on dimensional accuracy of parts, complex flow, long manufacturing period, high processing cost due to material utilization rate and period in the traditional manufacturing process, titanium alloy belongs to a deformable cracking material, and difficulty in controlling the size and performance of the parts formed by the traditional process.
Disclosure of Invention
The application provides a forming method of a TC4 thin-wall guide cylinder SLM, which solves the technical problems that in the related art, the manufacturing flow of a TC4 thin-wall guide cylinder component is complex, the manufacturing period is long, the processing cost is high due to the utilization rate and the period of materials, and the size and performance control of parts are difficult.
The embodiment of the application provides a molding method of a TC4 thin-wall guide cylinder SLM, which comprises the following steps:
constructing an initial three-dimensional model of the TC4 thin-wall guide cylinder;
setting a support for the initial three-dimensional model to form an intermediate three-dimensional model;
adding a margin to the intermediate three-dimensional model to form a target three-dimensional model;
3D printing is carried out according to the target three-dimensional model so as to obtain a first blank;
performing heat treatment on the first blank to obtain a second blank;
and finishing the second blank to obtain the target TC4 thin-wall guide cylinder.
In some embodiments, the step of providing support to the initial three-dimensional model to form an intermediate three-dimensional model comprises:
a first solid support is arranged on the periphery of the arc-shaped plate;
a second solid support is arranged in a region with an included angle smaller than 45 degrees with the horizontal plane in the junction of the outer wall of the cylinder and the arc-shaped plate;
a third solid support is arranged in a region with the included angle of the arc-shaped plate and the horizontal plane being smaller than 45 degrees;
a fourth solid support is arranged at the step structure to form an intermediate three-dimensional model;
the TC4 thin-wall guide cylinder comprises a cylinder and an arc-shaped plate which is arranged on the outer wall of the cylinder in a surrounding mode, and the top end of the cylinder is provided with the step structure.
In some embodiments, a first physical support is provided on the perimeter side of the arcuate plate; a second solid support is arranged in a region with an included angle smaller than 45 degrees with the horizontal plane in the junction of the outer wall of the cylinder and the arc-shaped plate; a third solid support is arranged in a region with the included angle of the arc-shaped plate and the horizontal plane being smaller than 45 degrees, and grid supports are used as auxiliary materials; the step of providing a fourth solid support at the step structure to form an intermediate three-dimensional model comprises:
a plurality of first sub-supports are arranged at intervals on the periphery of the arc-shaped plate so as to form the first solid support; the first sub-support is in a strip shape, the thickness of the first sub-support is 1-4 mm, and the width of the first sub-support is 3-8 mm;
a plurality of second sub-supports are arranged in the junction of the outer wall of the cylinder and the arc-shaped plate and in the area with the included angle smaller than 45 degrees with the horizontal plane, so that the second solid supports are formed; wherein the second sub-support is in a cambered surface shape, and the thickness of the second sub-support is 1 mm-3 mm;
a plurality of third sub-supports are arranged at intervals in the area with the included angle of the arc-shaped plate and the horizontal plane being smaller than 45 degrees so as to form a third solid support, and grid supports are used as auxiliary supports; wherein the third sub-support is cylindrical;
and a rounded corner structure is arranged at the sharp corner of the step structure to form a fourth solid support, wherein the radius of the rounded corner structure is 1-3 mm.
In some embodiments, the step of adding a margin to the intermediate three-dimensional model to form a target three-dimensional model comprises:
adding a first margin at the top end of the cylinder;
adding a second allowance at a round hole on the arc-shaped plate so as to fill the round hole;
adding a third allowance on the periphery side of the arc-shaped plate;
the TC4 thin-wall guide cylinder comprises a cylinder and an arc-shaped plate which is arranged on the outer wall of the cylinder in a surrounding mode, and a plurality of round holes are formed in the arc-shaped plate.
In some embodiments, the step of adding a first margin at the top end of the cylinder comprises:
adding a first allowance with the height of 1 mm-2 mm at the top end of the cylinder;
the step of adding a third allowance on the surface of the circumference side of the arc plate comprises the following steps:
and adding a third allowance with the thickness of 1 mm-2 mm on the periphery of the arc-shaped plate.
6. The method of forming a TC4 thin walled cylinder SLM according to claim 1, wherein said step of supporting said initial three dimensional model to form an intermediate three dimensional model is preceded by the step of:
the molding direction of the initial three-dimensional model is set to be upward.
In some embodiments, the step after adding a margin to the intermediate three-dimensional model to form a target three-dimensional model comprises:
and performing deformation prevention simulation calculation on the target three-dimensional model, wherein the deformation threshold value of the simulation calculation is set to be 0.1mm.
In some embodiments, the step of 3D printing from the target three-dimensional model to obtain a first blank comprises:
slicing the target three-dimensional model to obtain a two-dimensional graph corresponding to each layer of slice;
and guiding the two-dimensional graph into SLM forming equipment, setting the scanning interval to be 0.08-0.14 mm, setting the entity scanning speed to be 900-1200 mm/s, setting the inner contour scanning speed to be 700-1250 mm/s, and performing 3D printing after the outer contour scanning speed to be 700-1400 mm/s so as to obtain the first blank.
In some embodiments, the step of heat treating the first blank to obtain a second blank comprises:
placing the formed first blank and the substrate into a high-temperature vacuum heat treatment furnace, heating the first blank to (500+/-10) ℃ along with the furnace, preserving heat for 0.5 hour, continuously heating to (820+/-20) and preserving heat for 0.5 hour, and finally cooling the first blank to 200 ℃ along with the furnace, discharging and air-cooling to obtain the second intermediate blank;
and performing bulging control treatment on the second intermediate blank to obtain the second blank.
In some embodiments, the step of finishing the second blank to obtain the target TC4 thin-walled guide shell includes:
separating the second blank from the substrate;
blowing sand on the outer surface of the second blank; wherein the abrasive is corundum sand, the granularity is set to be 20-180 meshes, the pressure of compressed air is set to be 0.4-0.6 MPa, the diameter of a nozzle is set to be 12.5mm, and the sand blowing distance is set to be more than or equal to 100mm;
and removing the support and the allowance to obtain the target TC4 thin-wall guide cylinder.
The beneficial effects of the application are as follows:
according to the SLM forming method of the TC4 thin-wall guide cylinder, the TC4 thin-wall guide cylinder is formed in the mode of the SLM, the production efficiency of parts can be improved, the manufacturing cost is reduced, the accuracy and performance of the SLM forming can be effectively controlled through the design of the solid support and the design of the allowance adding scheme, the processing procedures after forming components are reduced, and accordingly the manufacturing period is shortened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention.
Fig. 1 is a schematic structural diagram of an initial three-dimensional model according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a three-dimensional model of a target according to an embodiment of the present application.
Fig. 3 is a schematic view of another angle of fig. 2.
Fig. 4 is a partial enlarged view of fig. 2.
Fig. 5 is a partial enlarged view of fig. 2.
FIG. 6 is an assembly schematic of a thermal expansion tooling with a second blank.
Reference numerals illustrate:
1-initial three-dimensional model, 2-target three-dimensional model, 3-second blank, 4-base plate, 100-cylinder, 110-ladder structure, 111-fourth solid support, 120-first solid support, 121-first sub-support, 130-second solid support, 131-second sub-support, 140-first allowance, 200-arc plate, 210-third solid support, 212-third sub-support, 220-round hole, 221-second allowance, 230-third allowance, 300-thermal expansion tool, 310-mandrel, 320-split tile.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all the directional indicators in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are correspondingly changed.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The embodiment of the application provides a forming method of a TC4 thin-wall guide cylinder SLM, which can improve the production efficiency of parts and reduce the manufacturing cost. The selective laser melting (Selective Laser Melting, SLM) technology is to scan the metal superalloy powder bed layer by layer according to the planned path in the three-dimensional CAD slice model by using laser as energy source, and the scanned metal superalloy powder is melted and solidified to achieve the metallurgical bonding effect, and finally the metal part designed by the model is obtained. The method can be used for manufacturing the terminal and near-terminal metal products of complex parts, has the advantages of short forming period, high precision and good performance of formed components, high material utilization rate, low manufacturing cost and the like, and can be widely applied to the field of aerospace. The method comprises the following steps:
s1: an initial three-dimensional model 1 of the TC4 thin-walled flow guide cylinder is constructed.
Referring to fig. 1, the tc4 thin-walled cylinder includes a cylinder 100 and an arc plate 200 surrounding the outer wall of the cylinder 100, the top end of the cylinder 100 has a stepped structure, and the arc plate 200 has a plurality of circular holes 220 thereon. The initial three-dimensional model 1 of the TC4 thin-walled flow guide cylinder can be constructed in three-dimensional software according to the shape and the structure of the TC4 thin-walled flow guide cylinder, and the three-dimensional software can be UG, proe and the like, so that the method is not limited.
S2: the molding direction of the initial three-dimensional model 1 is set to be upward.
Before the support is arranged, the forming direction of the TC4 thin-wall guide cylinder can be selected, and the forming direction of the initial three-dimensional model 1 can be set to be vertical upwards, so that the roundness of the TC4 thin-wall guide cylinder is ensured.
S3: a support is provided for the initial three-dimensional model 1 to form an intermediate three-dimensional model.
In order to provide support for the formation of the next layer in the subsequent printing process, prevent collapse, heat conduction, thermal deformation and doctor blade collision, a support structure is required to be arranged for the initial three-dimensional model 1, and the support structure is arranged at a position where the initial three-dimensional model 1 has a deformation tendency in the subsequent printing process.
Referring to fig. 2 and 3, in some embodiments, the step of providing support to the initial three-dimensional model 1 to form an intermediate three-dimensional model includes:
s31: a first solid support 120 is provided at the circumferential side of the arc plate 200.
A plurality of first sub-supports 121 may be disposed at intervals on the circumferential side of the arc plate 200 to form the first solid support 120. The first sub-support 121 is in a strip shape, and the thickness of the first sub-support 121 is 1 mm-4 mm, and the width of the first sub-support 121 is 3 mm-8 mm.
S32: a second solid support 130 is provided in the region of the intersection of the outer wall of the cylinder 100 and the arcuate plate 200 at an angle of less than 45 ° to the horizontal.
A plurality of second sub-supports 131 may be provided in an area having an included angle of less than 45 ° with respect to the horizontal plane in the junction of the outer wall of the cylinder 100 and the arc plate 200 to form a second solid support 130. It is apparent that the junction line of the outer wall of the cylinder 100 and the arc plate 200 is circular, and thus the second sub-support 131 is in the shape of an arc surface, and the thickness of the second sub-support 131 is 1mm to 3mm.
S33: a third solid support 210 is provided in the area where the arc 200 makes an angle of less than 45 deg. with the horizontal.
A plurality of third sub-supports 212, which may be disposed at intervals in a region where the arc 200 forms an angle smaller than 45 ° with the horizontal plane, to form a third solid support 210, and are supplemented with grid supports; wherein the third sub-support 212 is cylindrical.
Because the third sub-supports 212 are columnar supports, the diameters of the third sub-supports are designed to be smaller for easy processing and removal, so that an unsupported gap exists between two adjacent third sub-supports 212, and because the angle between the cambered surface and the horizontal plane is smaller than 45 degrees, supports are added to fill the gap between two adjacent third sub-supports 212 for preventing the part from warping in the forming process, grid supports can be added between the two adjacent third sub-supports 212 for assisting in supporting, the grid supports can be manually removed later, material waste can be reduced, and the processing period of parts can be reduced.
S34: a fourth solid support 111 is provided at the step structure to form an intermediate three-dimensional model.
Referring to fig. 2 and 4, a rounded corner structure is disposed at a sharp corner of the step structure to form a fourth solid support 111 to reduce the risk of deformation and cracking due to stress concentration. The radius of the round-corner guiding structure can be 1 mm-3 mm.
It should be noted that, the first physical support 120, the second physical support 130, the third physical support 210, and the fourth physical support 111 may be set in three-dimensional software such as UG, and the grid support may be set in slicing software such as Magics.
S4: a margin is added to the intermediate three-dimensional model to form a target three-dimensional model 2.
In order to ensure that the molded part still can meet the size requirement after being processed, the machining allowance of the middle three-dimensional model is added, so that the later processing is convenient.
In some embodiments, the step of adding a margin to the intermediate three-dimensional model to form the target three-dimensional model 2 includes:
s41: a first margin 140 is added to the top end of the cylinder 100.
The overall height of the part in the longitudinal direction has a shrinkage after the printing is finished, so that a first margin 140 needs to be added to the top end of the cylinder 100 for supplementing the shrinkage in the Z-axis direction. Specifically, a first margin 140 having a height of 1mm to 2mm may be added to the top end of the cylinder 100 for later part shrinkage compensation.
S42: a second margin 221 is added at the circular hole 220 on the arc plate 200 to fill the circular hole 220.
Because the arc plate 200 of the target TC4 thin-walled guide cylinder is provided with the plurality of round holes 220, in order to process the round holes 220 later, a second allowance 221 is added at the round holes 220 on the arc plate 200 to fill the round holes 220, and then the structural size is ensured by machining.
S43: a third margin 230 is added to the peripheral side of the arcuate plate 200.
Referring to fig. 2 and 5, since a small amount of support structures remain around the arc 200 after the subsequent machining, polishing is required, and thus a polishing margin is required to be added to the circumference of the arc 200. Specifically, a third margin 230 having a thickness of 1mm to 2mm may be added to the circumferential side of the arc plate 200.
S5: anti-deformation simulation calculation is performed on the target three-dimensional model 2, and the simulation calculation deformation threshold is set to be 0.1mm.
The deformation prevention simulation calculation of the target three-dimensional model 2 can be performed by using simulation analysis software such as Simufact Additive, the simulation calculation software can automatically change the part structure to perform part anti-deformation compensation, an allowable deformation maximum value is set before anti-deformation, the maximum value is the simulation calculation deformation threshold, and the calculation software can perform continuous iterative calculation until the deformation is lower than the set simulation calculation deformation threshold.
S6: 3D printing is performed according to the target three-dimensional model 2 to obtain a first blank.
After the stress strain value of the target three-dimensional model 2 meets the design requirement, 3D printing can be performed according to the target three-dimensional model 2 so as to ensure the service performance and mechanical properties of the printed first blank.
In some embodiments, the step of 3D printing according to the target three-dimensional model 2 to obtain the first blank comprises:
s61: and slicing the target three-dimensional model 2 to obtain a two-dimensional graph corresponding to each slice.
I.e. converting the target three-dimensional model 2 into a two-dimensional contour, this step can be performed in slicing software such as Magics.
S62: the two-dimensional pattern is led into an SLM forming device, the scanning interval is set to be 0.08-0.14 mm, the entity scanning speed is set to be 900-1200 mm/s, the inner contour scanning speed is set to be 700-1250 mm/s, and 3D printing is carried out after the outer contour scanning speed is set to be 700-1400 mm/s, so that a first blank piece is obtained.
The SLM forming equipment is filled with titanium alloy TC4 powder, a mounting substrate and a scraper, TC4 powder with the particle size of 35-53 mu m is adopted, a wear-resistant plastic material scraper is adopted, the substrate is selected from titanium alloy TC4 substrates which are good in wettability with component materials and consistent in linear expansion coefficient with the component materials, and the thickness t=45mm. And drying the titanium alloy powder in a vacuum drying oven at 80 ℃ for 6 hours.
When installing scraper and base plate, reduce shaping platform by a take-off altitude, then remove the platform top with the scraper, the used scraper of equipment is rubber scraper, removes the scraper and looks over the damage degree, changes new scraper when necessary. And installing the substrate and performing preliminary position adjustment, primarily installing the scraper on the tool rest, lightly screwing the jackscrew, fixing the scraper on the tool rest, and enabling the surface of the substrate to be flush with the bottom surface of the forming bin by moving the forming platform. And moving the scraper above the platform, loosening the jackscrews to enable the hairbrush cutter to be in a free falling state, and then lifting the platform by 5mm to screw the jackscrews in sequence from inside to outside. Confirming that the powder collecting barrel is installed and the valve is opened, performing powder spreading operation, adjusting the powder feeding amount to 7 grids, and fine-adjusting the position of the substrate through the powder spreading effect until the outline of the substrate can be seen through the powder layer. After the substrate position is determined, the laser incident protection mirror is cleaned in a spiral manner from inside to outside by using special IPA and mirror wiping paper. Closing the forming bin gate, clicking a door lock button, pressing a blue reset button on the equipment, opening a platform for heating, and performing forming bin gas washing.
When the oxygen content of the molding bin is reduced to below 1000PPM, sintering the first layer of powder by adopting single-layer scanning, then sintering layer by layer according to the parameters, and performing SLM molding of the part to obtain a first blank.
After the forming is finished, the substrate is closed for heating, under the atmosphere of argon protection, after the temperature of the substrate is naturally cooled to the room temperature, the forming cabin is opened, the explosion-proof dust collector is opened for cleaning powder on the wall of the cabin, and after the cleaning is finished, the powder materials in the equipment are separated according to the primary recovery powder and the secondary recovery powder. (the primary powder is powder which is not used in a powder feeding bin, and the secondary powder is powder which is adhered in a forming bin, a powder collecting bin and a part cavity and on the surface of the part cavity); lowering the molding bin to the lowest point, moving the molding bin to a powder removing area, taking out powder in the molding bin, unscrewing 10 screws on the base plate in a diagonal sequence, taking down the base plate with parts, placing the base plate on a moving vehicle platform, and finally using further cleaning equipment of a dust collector.
S7: the first blank member is subjected to heat treatment to obtain a second blank member 3.
Referring to fig. 6, in order to improve the mechanical properties of the first blank, so as to fully release the residual stress of the guide cylinder, finally obtain the SLM-molded TC4 thin-wall guide cylinder member with stable and reliable shape and performance, heat treatment is required to be performed on the first blank.
In some embodiments, the step of heat treating the first blank to obtain the second blank 3 comprises:
s71: placing the molded first blank and the substrate into a high-temperature vacuum heat treatment furnace, heating the first blank to (500+/-10) ℃ along with the furnace, preserving heat for 0.5 hour, continuously heating to (820+/-20) and preserving heat for 0.5 hour, finally cooling the first blank to 200 ℃ along with the furnace, discharging and air-cooling to obtain a second intermediate blank.
S72: and performing bulging control treatment on the second intermediate blank to obtain a second blank 3.
It should be noted that, the TC4 thin-walled cylinder has a wall thickness of 2mm, and is easily deformed after printing and heat treatment, so that a post bulging process is required to ensure the inner and outer diameters of the cylinder 100, and in order to save the manufacturing cycle, the bulging control process is performed simultaneously with the stress annealing process of the TC4 thin-walled cylinder.
Specifically, the design of the thermal expansion tooling 300 can be performed in Auto CAD according to the allowable range of the dimensional tolerance of the parts, and the tooling material is 1Cr18Ni9Ti stainless steel. The thermal bulging tool 300 comprises a bulging mandrel 310 and split blocks 320, wherein the bulging mandrel 310 is arranged in the cylinder 100 during thermal bulging, the split blocks 320 are arranged on the outer wall of the cylinder 100, and the thermal bulging is completed and then the thermal bulging is taken out.
S8: and finishing the second blank 3 to obtain the target TC4 thin-wall guide cylinder.
The finishing treatment is to remove the supporting structure, surface treatment, etc. from the second blank member 3 to improve the quality of the printed matter.
In some embodiments, the step of finishing the second blank 3 to obtain the target TC4 thin walled cylinder comprises:
s81: the second blank member 3 is separated from the base plate 4.
The second blank member 3 may be separated from the base plate 4 by wire cutting.
S82: blowing sand on the outer surface of the second blank 3; wherein the abrasive is corundum sand, the granularity is set to be 20-180 meshes, the pressure of compressed air is set to be 0.4-0.6 MPa, the diameter of a nozzle is set to be 12.5mm, and the sand blowing distance is set to be more than or equal to 100mm;
s83: and removing the support and the allowance to obtain the target TC4 thin-wall guide cylinder.
And the physical support and the part finish machining can be removed by utilizing machining, so that the size requirement of the final target TC4 thin-wall guide cylinder is ensured.
According to the SLM forming method of the TC4 thin-wall guide cylinder, the TC4 thin-wall guide cylinder is formed in the mode of the SLM, the production efficiency of parts can be improved, the manufacturing cost is reduced, the accuracy and performance of the SLM forming can be effectively controlled through the design of the solid support and the design of the allowance adding scheme, the processing procedures after forming components are reduced, and accordingly the manufacturing period is shortened.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The molding method of the SLM of the TC4 thin-wall guide cylinder is characterized by comprising the following steps of:
constructing an initial three-dimensional model of the TC4 thin-wall guide cylinder;
setting a support for the initial three-dimensional model to form an intermediate three-dimensional model;
adding a margin to the intermediate three-dimensional model to form a target three-dimensional model;
3D printing is carried out according to the target three-dimensional model so as to obtain a first blank;
performing heat treatment on the first blank to obtain a second blank;
and finishing the second blank to obtain the target TC4 thin-wall guide cylinder.
2. The method of forming a TC4 thin walled cylinder SLM according to claim 1, wherein said step of providing support to said initial three dimensional model to form an intermediate three dimensional model comprises:
a first solid support is arranged on the periphery of the arc-shaped plate;
a second solid support is arranged in a region with an included angle smaller than 45 degrees with the horizontal plane in the junction of the outer wall of the cylinder and the arc-shaped plate;
a third solid support is arranged in a region with the included angle of the arc-shaped plate and the horizontal plane being smaller than 45 degrees;
a fourth solid support is arranged at the step structure to form an intermediate three-dimensional model;
the TC4 thin-wall guide cylinder comprises a cylinder and an arc-shaped plate which is arranged on the outer wall of the cylinder in a surrounding mode, and the top end of the cylinder is provided with the step structure.
3. The method of forming a TC4 thin walled cylinder SLM of claim 2 wherein a first solid support is provided on a perimeter side of the arcuate plate; a second solid support is arranged in a region with an included angle smaller than 45 degrees with the horizontal plane in the junction of the outer wall of the cylinder and the arc-shaped plate; a third solid support is arranged in a region with the included angle of the arc-shaped plate and the horizontal plane being smaller than 45 degrees, and grid supports are used as auxiliary materials; the step of providing a fourth solid support at the step structure to form an intermediate three-dimensional model comprises:
a plurality of first sub-supports are arranged at intervals on the periphery of the arc-shaped plate so as to form the first solid support; the first sub-support is in a strip shape, the thickness of the first sub-support is 1-4 mm, and the width of the first sub-support is 3-8 mm;
a plurality of second sub-supports are arranged in the junction of the outer wall of the cylinder and the arc-shaped plate and in the area with the included angle smaller than 45 degrees with the horizontal plane, so that the second solid supports are formed; wherein the second sub-support is in a cambered surface shape, and the thickness of the second sub-support is 1 mm-3 mm;
a plurality of third sub-supports are arranged at intervals in the area with the included angle of the arc-shaped plate and the horizontal plane being smaller than 45 degrees so as to form a third solid support, and grid supports are used as auxiliary supports; wherein the third sub-support is cylindrical;
and a rounded corner structure is arranged at the sharp corner of the step structure to form a fourth solid support, wherein the radius of the rounded corner structure is 1-3 mm.
4. The method of SLM forming a TC4 thin walled cylinder SLM according to claim 1, wherein said step of adding margin to said intermediate three dimensional model to form a target three dimensional model comprises:
adding a first margin at the top end of the cylinder;
adding a second allowance at a round hole on the arc-shaped plate so as to fill the round hole;
adding a third allowance on the periphery side of the arc-shaped plate;
the TC4 thin-wall guide cylinder comprises a cylinder and an arc-shaped plate which is arranged on the outer wall of the cylinder in a surrounding mode, and a plurality of round holes are formed in the arc-shaped plate.
5. The method of forming a TC4 thin walled cylinder SLM of claim 1, wherein said step of adding a first margin at the top end of the cylinder includes:
adding a first allowance with the height of 1 mm-2 mm at the top end of the cylinder;
the step of adding a third allowance on the surface of the circumference side of the arc plate comprises the following steps:
and adding a third allowance with the thickness of 1 mm-2 mm on the periphery of the arc-shaped plate.
6. The method of forming a TC4 thin walled cylinder SLM according to claim 1, wherein said step of supporting said initial three dimensional model to form an intermediate three dimensional model is preceded by the step of:
the molding direction of the initial three-dimensional model is set to be upward.
7. The method of SLM forming a TC4 thin walled cylinder SLM according to claim 1, wherein the step after adding a margin to said intermediate three dimensional model to form a target three dimensional model comprises:
and performing deformation prevention simulation calculation on the target three-dimensional model, wherein the deformation threshold value of the simulation calculation is set to be 0.1mm.
8. The method of forming a TC4 thin walled guide shell SLM according to claim 1, wherein said step of 3D printing according to said target three dimensional model to obtain a first blank comprises:
slicing the target three-dimensional model to obtain a two-dimensional graph corresponding to each layer of slice;
and guiding the two-dimensional graph into SLM forming equipment, setting the scanning interval to be 0.08-0.14 mm, setting the entity scanning speed to be 900-1200 mm/s, setting the inner contour scanning speed to be 700-1250 mm/s, and performing 3D printing after the outer contour scanning speed to be 700-1400 mm/s so as to obtain the first blank.
9. The method of forming a TC4 thin walled cylinder SLM of claim 1, wherein said step of heat treating said first blank to obtain a second blank includes:
placing the formed first blank and the substrate into a high-temperature vacuum heat treatment furnace, heating the first blank to (500+/-10) ℃ along with the furnace, preserving heat for 0.5 hour, continuously heating to (820+/-20) and preserving heat for 0.5 hour, and finally cooling the first blank to 200 ℃ along with the furnace, discharging and air-cooling to obtain the second intermediate blank;
and performing bulging control treatment on the second intermediate blank to obtain the second blank.
10. The method for forming the TC4 thin walled cylinder SLM according to claim 1, wherein said step of finishing said second blank member to obtain a target TC4 thin walled cylinder includes:
separating the second blank from the substrate;
blowing sand on the outer surface of the second blank; wherein the abrasive is corundum sand, the granularity is set to be 20-180 meshes, the pressure of compressed air is set to be 0.4-0.6 MPa, the diameter of a nozzle is set to be 12.5mm, and the sand blowing distance is set to be more than or equal to 100mm;
and removing the support and the allowance to obtain the target TC4 thin-wall guide cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311812863.4A CN117773147A (en) | 2023-12-27 | 2023-12-27 | SLM forming method of TC4 thin-wall guide cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311812863.4A CN117773147A (en) | 2023-12-27 | 2023-12-27 | SLM forming method of TC4 thin-wall guide cylinder |
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| Publication Number | Publication Date |
|---|---|
| CN117773147A true CN117773147A (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311812863.4A Pending CN117773147A (en) | 2023-12-27 | 2023-12-27 | SLM forming method of TC4 thin-wall guide cylinder |
Country Status (1)
| Country | Link |
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| CN (1) | CN117773147A (en) |
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2023
- 2023-12-27 CN CN202311812863.4A patent/CN117773147A/en active Pending
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