Rotation shell 3D printing method and rotation shell

Abstract

The present invention belongs to the technical field of explosives, and discloses a 3D printing method for a rotating shell and a rotating shell. The 3D printing method for a rotating shell comprises the following steps: obtaining a three-dimensional model of the rotating shell, and dividing the three-dimensional model into multiple 3D printing layers along its own axial direction; laying metal powder layer by layer, and dividing the laying area of ​​each layer of metal powder to obtain multiple fragment areas and multiple connection areas; after laying each layer of metal powder, using an SLM process to process the metal powder located in the fragment area and the connection area, wherein the laser parameters of the laser irradiated on the fragment area and the laser parameters of the laser irradiated on the connection area are at least partially unequal, the metal powder located in the fragment area is melted and solidified to form a fragment layer, and the metal powder located in the connection area is melted and solidified to form a connection layer, the density of the fragment layer is greater than the density of the connection layer, and the fragment layer and the connection layer constitute a 3D printing layer.

Description

Technical Field

[0001] The present invention relates to the technical field of explosives, and in particular to a 3D printing method for a rotary shell and a rotary shell. Background Art

[0002] When explosives such as grenades or artillery shells explode, the shell of the explosive ruptures to form fragments, which are used as warheads. In order to improve the explosion effect, the shell structure is usually improved so that regular fragments are formed as much as possible when the shell ruptures.

[0003] The current processing methods for the shell of explosives include 3D printing methods, machining methods, etc. Among them, the machining method cannot obtain a groove with a larger depth-to-width ratio. A small depth-to-width ratio of the groove indicates that the proportion of fragments is small, and the killing effect cannot meet the expected value. The shell of explosives obtained by the 3D printing method has a groove with a larger depth-to-width ratio.

[0004] However, the shell of the explosive is made of high-toughness and high-strength metal material. Even with the existing 3D printing method, the phenomenon of connected fragments cannot be avoided. For example, the application number is CN202123094672.8, and the application name is a 3D printed shell. When the explosive explodes, there are still adjacent fragments, and the explosion effect still needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to provide a rotating shell 3D printing method and a rotating shell, so as to reduce the difficulty of cracking of the rotating shell during explosion, avoid the phenomenon of fragments being connected, and improve the explosion effect.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, a method for 3D printing a rotating shell is provided, comprising the following steps:

[0008] Acquire a three-dimensional model of the shell of revolution, and divide the three-dimensional model into multiple 3D printing layers along its own axial direction;

[0009] Laying metal powder layer by layer, dividing the laying area of ​​each layer of the metal powder to obtain a plurality of fragmentation areas and a plurality of connection areas;

[0010] After each layer of the metal powder is laid, the SLM process is used to process the metal powder located in the fragment area and the connecting area, wherein the laser parameters of the laser irradiated on the fragment area are at least partially unequal to the laser parameters of the laser irradiated on the connecting area, the metal powder located in the fragment area is melted and solidified to form a fragment layer, and the metal powder located in the connecting area is melted and solidified to form a connecting layer, the density of the fragment layer is greater than the density of the connecting layer, and the fragment layer and the connecting layer constitute the 3D printing layer.

[0011] As an optional technical solution, the spot diameter of the laser irradiated on the fragment area is 30-100 μm, and the spot diameter of the laser irradiated on the connection area is 30-100 μm.

[0012] As an optional technical solution, the actual scanning power of the laser irradiated on the fragment area is 200-800W, and the actual scanning power of the laser irradiated on the connection area is 50-100W.

[0013] As an optional technical solution, the physical scanning speed of the laser irradiated on the fragment area is 100-1000 mm / s, and the physical scanning speed of the laser irradiated on the connection area is 1500-3000 mm / s.

[0014] As an optional technical solution, the contour scanning power of the laser irradiated on the fragment area is 200-500W, and the contour scanning power of the laser irradiated on the connection area is 50-280W.

[0015] As an optional technical solution, the contour scanning speed of the laser irradiated on the fragment area is 100-900 mm / s, and the contour scanning speed of the laser irradiated on the connection area is 200-1200 mm / s.

[0016] As an optional technical solution, the physical line spacing of the laser irradiated on the fragment area is 0.06-0.15mm, and the physical line spacing of the laser irradiated on the connection area is 0.16-0.30mm.

[0017] In a second aspect, a rotating shell is provided, which is made by the rotating shell 3D printing method as described above, and the rotating shell includes a plurality of broken fragment parts and a plurality of connecting parts, the broken fragment parts are composed of multiple layers of the broken fragment layers stacked in sequence, and the connecting parts are composed of multiple layers of the connecting layers stacked in sequence, and the multiple broken fragment parts are arranged at intervals, and the interval space between two adjacent broken fragment parts is a pre-groove, and two adjacent broken fragment parts are connected by the connecting part, and the connecting part is located in the depth direction of the pre-groove, and the density of the broken fragment parts is greater than the density of the connecting part.

[0018] As an optional technical solution, the depth direction of the pre-groove is arranged at an angle with the central axis of the rotary shell, and the angle is less than 90°.

[0019] Beneficial effects of the present invention:

[0020] The present invention provides a 3D printing method for a rotating shell, which comprises the following steps: obtaining a three-dimensional model of a rotating shell, dividing the three-dimensional model into multiple 3D printing layers along its own axial direction; laying metal powder layer by layer, dividing the laying area of ​​each layer of metal powder to obtain multiple fragmentation areas and multiple connection areas; after laying each layer of metal powder, using an SLM process to process the metal powder located in the fragmentation area and the connection area, wherein the laser parameters of the laser irradiated on the fragmentation area are at least partially unequal to the laser parameters of the laser irradiated on the connection area, the metal powder located in the fragmentation area is melted and solidified to form a fragmentation layer, the metal powder located in the connection area is melted and solidified to form a connection layer, the density of the fragmentation layer is greater than the density of the connection layer, and the fragmentation layer and the connection layer constitute a 3D printing layer.

[0021] Since at least part of the laser parameters are not equal, the density of the fragment layer is greater than that of the connecting layer, and the connecting layer is easier to crack than the fragment layer, thereby avoiding the phenomenon of fragments being connected and improving the explosion effect.

[0022] The present invention also provides a rotating shell, which is made by the rotating shell 3D printing method as above, and includes multiple fragment parts and multiple connecting parts. The fragment parts are composed of multiple fragment layers stacked in sequence, and the connecting parts are composed of multiple connecting layers stacked in sequence. The multiple fragment parts are arranged at intervals, and the interval space between two adjacent fragment parts is a pre-groove. The two adjacent fragment parts are connected by the connecting part, and the connecting part is located in the depth direction of the pre-groove.

[0023] The fragment part is composed of multiple layers of fragment layers stacked in sequence, and the connecting part is composed of multiple layers of connecting layers stacked in sequence. The density of the fragment part is greater than that of the connecting part, and the connecting part is easier to crack than the fragment part. When the explosive explodes, under the action of the explosion pressure, the rotating shell cracks along the depth direction of the pre-groove. The connecting part is located in the depth direction of the pre-groove, and the crack passes through the connecting part along the depth direction of the pre-groove, thereby separating the two adjacent fragment parts. After the rotating shell explodes, each fragment part is separated, and there is no situation where two fragment parts are connected by the connecting part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the first structure of the rotary shell of the present invention;

[0025] Figure 2 is a schematic diagram of a second structure of the rotary shell of the present invention;

[0026] Figure 3 is a third structural schematic diagram of the rotary shell of the present invention;

[0027] Figure 4 is a fourth structural schematic diagram of the rotary shell of the present invention;

[0028] Figure 5 is a longitudinal cross-sectional view of a fourth structure of a rotary shell of the present invention from a first viewing angle;

[0029] Figure 6 yes Figure 5 A partial enlarged view of position A in the middle;

[0030] Figure 7 is a longitudinal cross-sectional view of the fourth structure of the rotary shell of the present invention from a second viewing angle;

[0031] Figure 8 yes Figure 7 A partial enlarged view of position B in the middle;

[0032] Fig. 9 It is a schematic diagram of the structure of the 3D printing layer of the present invention;

[0033] Fig.10 yes Fig. 9 A partial enlarged view of the C position in the middle;

[0034] Fig.11 It is a schematic diagram of the structure of at least two 3D printing layers of the present invention;

[0035] Fig.12 yes Fig.11 A partial enlarged view of the D position in the middle;

[0036] Fig.13 It is a schematic diagram of the structure of the multi-layer 3D printing layer of the present invention;

[0037] Fig.14 yes Fig.13 A partial enlarged view of the E position in the middle;

[0038] Fig.15 It is a schematic diagram of the structure of the multi-layer 3D printing layer of the present invention;

[0039] Fig.16 yes Fig.15 A partial enlarged view of the F position in the middle.

[0040] In the figure:

[0041] 11. fragment portion; 111. fragment layer; 12. connection portion; 121. connection layer; 13. pre-groove. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0046] like Figure 1 As shown, the rotary shell is a straight cylindrical structure, and a plurality of pre-grooves 13 are provided on the outer wall of the rotary shell, a part of the pre-grooves 13 are forward spiral grooves, and another part of the pre-grooves 13 are reverse spiral grooves.

[0047] like Figure 2 As shown, the rotating shell is a conical structure, and a plurality of pre-grooves 13 are provided on the outer wall of the rotating shell, a part of the pre-grooves 13 are warp grooves, and another part of the pre-grooves 13 are weft grooves.

[0048] like Figure 3As shown, the rotating shell is a waist-contracted structure, and a plurality of pre-grooves 13 are provided on the outer wall of the rotating shell, a part of the pre-grooves 13 are warp grooves, and another part of the pre-grooves 13 are weft grooves.

[0049] like Figure 4 As shown, the rotating shell is a straight cylindrical structure, and a plurality of pre-grooves 13 are provided on the outer wall of the rotating shell, a part of the pre-grooves 13 are warp grooves, and another part of the pre-grooves 13 are weft grooves.

[0050] like Figures 5 to 16 The structures shown are Figure 4 The shell of revolution shown is the basis.

[0051] like Figures 1 to 16 As shown, this embodiment provides a rotating shell, which is made by a rotating shell 3D printing method. The rotating shell includes a plurality of fragment parts 11 and a plurality of connecting parts 12. The fragment parts 11 are composed of a plurality of fragment layers 111 stacked in sequence, and the connecting parts 12 are composed of a plurality of connecting layers 121 stacked in sequence. The plurality of fragment parts 11 are arranged at intervals, and the interval space between two adjacent fragment parts 11 is a pre-groove 13. Two adjacent fragment parts 11 are connected by the connecting part 12, and the connecting part 12 is located in the depth direction of the pre-groove 13. The density of the fragment parts 11 is greater than the density of the connecting part 12.

[0052] The fragment part 11 is composed of multiple layers of fragment layers 111 stacked in sequence, and the connecting part 12 is composed of multiple layers of connecting layers 121 stacked in sequence. The density of the fragment part 11 is greater than that of the connecting part 12, and the connecting part 12 is easier to crack than the fragment part 11. When the explosive explodes, under the action of the explosion pressure, the rotating shell cracks along the depth direction of the pre-groove 13. The connecting part 12 is located in the depth direction of the pre-groove 13, and the crack passes through the connecting part 12 along the depth direction of the pre-groove 13, thereby separating the two adjacent fragment parts 11. After the rotating shell explodes, each fragment part 11 is separated, and there is no situation where two fragment parts 11 are connected by the connecting part 12.

[0053] Density is also called packing ratio or maximum space utilization, which refers to the volume percentage occupied by atoms in a unit cell, that is, the ratio of the volume of atoms contained in a unit cell to the volume of the unit cell. The concept of density is used to describe the compactness of the atomic arrangement in a crystal structure. In this embodiment, the fragment portion 11 is a high-density area, and the connecting portion 12 is a low-density area. The fragment portion 11 has stronger toughness and higher strength, and the connecting portion 12 has weaker toughness and strength than the fragment portion 11. Therefore, during the explosion of the rotating shell, the crack is more likely to pass through the connecting portion 12 along the depth direction of the pre-grooved groove 13.

[0054] The revolving shell of the present embodiment is a shell of a cannonball, with the fragmentation part 11 as the killing part. When the shell explodes, it is necessary to split the shell into multiple fragmentation parts 11 that are not connected to each other as much as possible. Therefore, the present embodiment sets a pre-groove 13 on the revolving shell to improve the separation effect between the multiple fragmentation parts 11; the depth-to-width ratio of the pre-groove 13 needs to reach a certain size. If the depth-to-width ratio of the pre-groove 13 is relatively small, the volume of the surface fragmentation part 11 accounts for a small proportion, and the effect of explosion killing is not high. Therefore, the present embodiment adopts the SLM process to make the revolving shell, which can achieve a preset depth-to-width ratio of the pre-groove 13, while the traditional production method, such as using powder Metallurgical methods such as metal injection molding process a single-layer ring, cut a groove shape on the surface of the single-layer ring, and then stack and weld multiple single-layer rings to obtain a complete rotating shell. This method can use a tool to cut the groove on the single-layer ring, or it can use metal wire cutting, but the use of the tool is greatly limited, and the machinability of tungsten alloy is poor. During the processing, a groove with a higher aspect ratio cannot be obtained. The groove bottom thickness is too high, and there is a gap between the single-layer rings during the stacking and welding process, and the quality is uncontrollable. When using metal wire cutting, the width of the groove is limited by the diameter of the metal wire. The groove width obtained by this method is greater than the groove width of the present embodiment.

[0055] Optionally, the material of the rotating shell is a metal material, such as tungsten alloy.

[0056] In some embodiments, in the depth direction of the pre-groove 13, the notch of the pre-groove 13 faces the central axis of the rotating shell. The pre-groove 13 is located on the inner side of the rotating shell, and the connecting portion 12 is located on the outer side of the rotating shell.

[0057] In some other embodiments, the notch of the pre-groove 13 is away from the central axis of the rotating shell in the depth direction of the pre-groove 13. The pre-groove 13 is on the outer side of the rotating shell, and the connecting portion 12 is located on the inner side of the rotating shell.

[0058] In some embodiments, the outer wall or the inner wall of the rotating shell is provided with a plurality of pre-grooves 13, a portion of the pre-grooves 13 are forward spiral grooves, and another portion of the pre-grooves 13 are reverse spiral grooves; the forward spiral grooves are forward spirally encircled around the central axis of the rotating shell, and the reverse spiral grooves are reversely spirally encircled around the central axis of the rotating shell.

[0059] In some other embodiments, the outer wall or the inner wall of the rotating shell is provided with a plurality of pre-grooves 13, a portion of the pre-grooves 13 are warp grooves, and another portion of the pre-grooves 13 are weft grooves; the extension direction of the warp grooves is parallel to the central axis of the rotating shell, and the weft grooves surround the central axis of the rotating shell.

[0060] In some embodiments, the depth direction of the pre-grooved groove 13 is set at an angle with the central axis of the rotating shell, and the angle is less than 90 degrees. The depth direction of the pre-grooved groove 13 refers to the direction between the inner wall and the outer wall of the rotating shell. In the longitudinal section of the rotating shell, the pre-grooved groove 13 extends obliquely from the outer wall of the rotating shell to the connecting portion 12.

[0061] In some other embodiments, the depth direction of the pre-groove 13 is perpendicular to the central axis of the rotating shell.

[0062] In some embodiments, the rotating shell is divided into several layers along the axial direction, each layer includes several fragment parts 11, and the fragment parts 11 of two adjacent layers are staggered along the axial direction.

[0063] In some other embodiments, the rotary shell is divided into several layers along the axial direction, each layer includes several fragment parts 11, and the fragment parts 11 of two adjacent layers are arranged one by one along the axial direction.

[0064] In this embodiment, the width of the pre-groove 13 is 0.1-0.2 mm, and the thickness of the connecting portion 12 is less than 0.5 mm along the depth direction of the pre-groove 13. The aspect ratio of the pre-groove 13 is extremely high, that is, the ratio of the depth of the pre-groove 13 to the width of the pre-groove 13 is large, the volume proportion of the fragment portion 11 is higher, the mass is larger, and the destructiveness is stronger.

[0065] Optionally, the central axis of the rotating shell is perpendicular to the transverse section of the rotating shell, and in the transverse section of the rotating shell, the pre-groove 13 is square, U-shaped or V-shaped.

[0066] In the transverse section of the rotary shell, the pre-groove 13 is square. In some other embodiments, the pre-groove 13 is U-shaped or V-shaped.

[0067] Optionally, the central axis of the rotating shell is located in the longitudinal section of the rotating shell, and in the longitudinal section of the rotating shell, the pre-groove 13 is square, U-shaped or V-shaped.

[0068] In the longitudinal section of the rotary shell, the pre-groove 13 is square. In some other embodiments, the pre-groove 13 is U-shaped or V-shaped.

[0069] This embodiment provides a 3D printing method for a rotating shell. The 3D printing method for a rotating shell is used to manufacture the rotating shell as above. The 3D printing method for a rotating shell comprises the following steps:

[0070] Step 100: Obtain a three-dimensional model of the shell of revolution, and divide the three-dimensional model into multiple 3D printing layers along its own axis.

[0071] Step 200: Lay metal powder layer by layer, and divide the laying area of ​​each layer of metal powder to obtain a plurality of broken areas and a plurality of connection areas.

[0072] Step 300, after each layer of metal powder is laid, the metal powder located in the fragment area and the connection area is processed by the SLM process, wherein the laser parameters of the laser irradiated on the fragment area are at least partially different from the laser parameters of the laser irradiated on the connection area, the metal powder located in the fragment area is melted and solidified to form a fragment layer 111, and the metal powder located in the connection area is melted and solidified to form a connection layer 121, the density of the fragment layer 111 is greater than the density of the connection layer 121, and the fragment layer 111 and the connection layer 121 constitute a 3D printing layer.

[0073] The SLM process, namely Selective Laser Melting, is an existing additive manufacturing technology.

[0074] In this embodiment, since at least part of the laser parameters are not equal, the density of the fragment layer 111 is greater than that of the connecting layer 121, and the connecting layer 121 is easier to crack than the fragment layer 111, thereby avoiding the phenomenon of fragments being connected and improving the explosion effect.

[0075] In step S200, after the metal powder is melted and solidified, another layer of metal powder is laid; in the axial projection direction, the metal powder layer is square, circular or annular, and in actual production, it is more convenient to lay a square metal powder layer. The cross-section of the rotating shell is an annular structure. Therefore, it is necessary to divide the metal powder layer into annular areas, which include multiple fragment areas, multiple connection areas and multiple static areas. The metal powder corresponding to the static area is not laser melted. After the rotating shell is completed, the metal powder corresponding to the static area is removed, and a pre-groove 13 is formed in the static area.

[0076] Each 3D printing layer needs to be printed according to the three-dimensional model of the rotating shell, so the laying area of ​​the metal powder needs to be adaptively divided.

[0077] For example, when the depth direction of the pre-groove 13 is perpendicular to the central axis of the rotating shell, each 3D printed layer of the rotating shell is composed of multiple fragment layers 111 and multiple connection layers 121 in an alternating manner. Therefore, each layer of metal powder needs to be divided into multiple fragment areas and multiple connection areas. Multiple fragment areas and multiple connection areas are arranged alternately in an annular manner to form an annular area. Two adjacent fragment areas are arranged at intervals. The interval area is a static area. The connection area connects the two adjacent fragment areas. When the metal powder in the fragment area is laser printed, the fragment layer 111 is obtained. When the metal powder in the connection area is laser printed, the connection layer 121 is obtained. After obtaining multiple layers of 3D printed layers, a shell composed of multiple fragment parts 11 and multiple connection parts 12 in an alternating manner is obtained. In actual situations, the rotating shell includes multiple layers of shells stacked in the axial direction. In the axial direction, two adjacent layers of shells are connected by the connection part 12.

[0078] Alternatively, when the depth direction of the pre-groove 13 is set at an angle with the central axis of the rotating shell and the angle is less than 90°, a part of the 3D printed layer of the rotating shell is composed of two annular structures, and the other part of the 3D printed layer is composed of one annular structure; in the 3D printed layer composed of the two annular structures, when the metal powder is divided into regions, one of the annular structures is composed of a part of the fragment area and a plurality of connecting areas arranged alternately in a surrounding manner, and the other annular structure is composed of another part of the fragment area arranged in a surrounding manner at intervals. In the two annular structures, one is used as an inner annular layer and the other is used as an outer annular layer, and the outer annular layer is spaced around the inner annular layer. The circumference of the ring layer and the gap between the inner ring layer and the outer ring layer are an annular static zone. The metal powder in the static zone is not laser melted. When the metal powder is laid again, the static zone located in the upper layer overlaps with the static zone located in the lower layer in the axial direction, and the other part is misaligned. After the metal powder in the static zone is removed, the pre-grooved groove 13 located in the upper layer is connected with the pre-grooved groove 13 located in the lower layer, and the connection direction is set at an angle with the central axis of the rotating shell, and the angle is less than 90°; in a 3D printing layer composed of an annular structure, when the metal powder is divided into areas, multiple fragment areas and multiple connection areas are arranged alternately in a surrounding manner.

[0079] In the rotating shell 3D printing method of the present embodiment, the spot diameter of the laser irradiated on the fragment area is 30-100μm, for example, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, and the spot diameter of the laser irradiated on the connection area is 30-100μm, for example, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm.

[0080] In the rotating shell 3D printing method of this embodiment, the physical scanning power of the laser irradiated on the fragment area is 200-800W, for example, 200W, 300W, 400W, 500W, 600W, 700W, 800W, and the physical scanning power of the laser irradiated on the connection area is 50-100W, for example, 50W, 60W, 70W, 80W, 90W, 100W.

[0081] In the rotating shell 3D printing method of this embodiment, the physical scanning speed of the laser irradiated on the fragment area is 100-1000mm / s, for example, 100mm / s, 200mm / s, 300mm / s, 400mm / s, 500mm / s, 600mm / s, 700mm / s, 800mm / s, 900mm / s, 1000mm / s, and the physical scanning speed of the laser irradiated on the connection area is 1500-3000mm / s, for example, 1500mm / s, 1800mm / s, 2100mm / s, 2400mm / s, 2700mm / s, 3000mm / s.

[0082] In the rotating shell 3D printing method of this embodiment, the contour scanning power of the laser irradiated on the fragment area is 200-500W, for example, 200W, 300W, 400W, 500W, and the contour scanning power of the laser irradiated on the connection area is 50-280W, for example, 50W, 90W, 130W, 180W, 210W, 250W, 280W.

[0083] In the rotating shell 3D printing method of this embodiment, the contour scanning speed of the laser irradiated on the fragmentation area is 100-900mm / s, for example, 100mm / s, 200mm / s, 300mm / s, 400mm / s, 500mm / s, 600mm / s, 700mm / s, 800mm / s, 900mm / s, and the contour scanning speed of the laser irradiated on the connection area is 200-1200mm / s, for example, 200mm / s, 400mm / s, 600mm / s, 800mm / s, 1000mm / s, 1200mm / s.

[0084] In the rotating shell 3D printing method of this embodiment, the physical line spacing of the laser irradiated on the fragment area is 0.06-0.15mm, for example, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, and the physical line spacing of the laser irradiated on the connection area is 0.16-0.30mm, for example, 0.16mm, 0.18mm, 0.20mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.30mm.

[0085] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A 3D printing method for a rotary shell, characterized in that: The following steps are involved: Acquire a three-dimensional model of the shell of revolution, and divide the three-dimensional model into multiple 3D printing layers along its own axial direction; Laying metal powder layer by layer, dividing the laying area of ​​each layer of the metal powder to obtain a plurality of fragmentation areas, a plurality of connection areas, and a plurality of static areas; After each layer of the metal powder is laid, the metal powder located in the fragment area and the connection area is processed using the SLM process, and the metal powder corresponding to the static area is not laser melted. After the rotating shell is manufactured, the metal powder corresponding to the static area is removed, and a pre-groove (13) is formed in the static area; wherein the laser parameters of the laser irradiated on the fragment area are at least partially different from the laser parameters of the laser irradiated on the connection area, the metal powder located in the fragment area is melted and solidified to form a fragment layer (111), and the metal powder located in the connection area is melted and solidified to form a connection layer (121), the density of the fragment layer (111) is greater than the density of the connection layer (121), and the fragment layer (111) and the connection layer (121) constitute the 3D printing layer.

2. The method for 3D printing a rotating shell according to claim 1, characterized in that: The spot diameter of the laser irradiated on the fragment area is 30-100 μm, and the spot diameter of the laser irradiated on the connection area is 30-100 μm.

3. The method for 3D printing a rotating shell according to claim 1, characterized in that: The actual scanning power of the laser irradiated on the fragment area is 200-800W, and the actual scanning power of the laser irradiated on the connection area is 50-100W.

4. The method for 3D printing a rotating shell according to claim 1, characterized in that: The actual scanning speed of the laser irradiated on the fragment area is 100-1000 mm / s, and the actual scanning speed of the laser irradiated on the connection area is 1500-3000 mm / s.

5. The method for 3D printing a rotating shell according to claim 1, characterized in that: The contour scanning power of the laser irradiated on the fragment area is 200-500W, and the contour scanning power of the laser irradiated on the connection area is 50-280W.

6. The method for 3D printing a rotating shell according to claim 1, characterized in that: The contour scanning speed of the laser irradiated on the fragment area is 100-900 mm / s, and the contour scanning speed of the laser irradiated on the connection area is 200-1200 mm / s.

7. The method for 3D printing a rotating shell according to claim 1, characterized in that: The physical line spacing of the laser irradiated on the fragment area is 0.06-0.15 mm, and the physical line spacing of the laser irradiated on the connection area is 0.16-0.30 mm.

8. A rotary shell, characterized in that: The revolving shell is manufactured by the 3D printing method according to any one of claims 1 to 7, wherein the revolving shell comprises a plurality of fragment parts (11) and a plurality of connecting parts (12), wherein the fragment parts (11) are composed of a plurality of fragment layers (111) stacked in sequence, and the connecting parts (12) are composed of a plurality of connecting layers (121) stacked in sequence, wherein the plurality of fragment parts (11) are arranged at intervals, and the interval space between two adjacent fragment parts (11) is a pre-grooved groove (13), and the two adjacent fragment parts (11) are connected by the connecting parts (12), and the connecting parts (12) are located in the depth direction of the pre-grooved groove (13), and the density of the fragment parts (11) is greater than the density of the connecting parts (12).

9. The rotary shell according to claim 8, characterized in that: The depth direction of the pre-grooved groove (13) is arranged at an angle with the central axis of the rotary shell, and the angle is less than 90°.

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