Clamping device and machining method for split type additive printing part

Abstract

The invention provides a clamping device and a machining method for a split type additive printing part. The clamping device comprises a profiling bottom plate, a profiling top plate and two sets of positioning mechanisms. The profiling top plate and the profiling bottom plate are assembled to form a containing cavity for containing the additive printing assembly part, a process hole is formed in the profiling top plate, after the additive printing assembly part is positioned by the positioning mechanism, the additive printing assembly part is clamped and fixed by the profiling top plate and the profiling bottom plate, and the clamped and fixed additive printing assembly part is machined through the process hole; and the positioning mechanism is used for positioning the additive printing assembly part. According to the clamping device and the machining method for the split type additive printing part, positioning and machining of the split type additive printing part can be rapidly completed, and the positioning precision, the clamping efficiency and the part qualification rate during machining are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of clamping devices, and in particular relates to a clamping device and a processing method for a split-type additively printed part. Background Art

[0002] In the field of aerospace, products are constantly developing along the trend of hollowing, thin-walled lightweight design, and special-shaped structures. The process scheme of combining additive printing technology with mechanical processing is gradually emerging. After the split additive printing parts are printed and formed using additive printing technology, they need to be assembled into assemblies, and then the surface of the assemblies is milled, through-punched and other machining processes are performed. At present, the deformation trend after additive printing cannot be maintained consistent, and the profile of the split additive printing parts is relatively poor, which indirectly causes the split additive printing parts in the assembled state to be time-consuming and labor-intensive to clamp and adjust during the mechanical processing, and the positioning accuracy of batch processing is poor, affecting the production efficiency and processing quality of the product. Therefore, it is necessary to solve the problems of time-consuming and labor-intensive clamping during mechanical processing and poor positioning accuracy of batch processing of such products after additive printing, so as to improve the overall production efficiency and qualified rate of such products. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the inventors have conducted intensive research and provided a clamping device and a processing method for split-type additively printed parts, which can quickly complete the positioning and processing of split-type additively printed parts, thereby improving the positioning accuracy, clamping efficiency and part qualification rate during processing.

[0004] The technical solution provided by the present invention is as follows:

[0005] In a first aspect, a split-type clamping device for additively printed parts includes a contoured bottom plate, a contoured top plate, and two sets of positioning mechanisms, each set of positioning mechanisms includes a pull rod, a limiter, and a locking pin;

[0006] The contoured bottom plate supports the additive printing assembly, a tie rod hole is opened from the side to the inside, and a locking pin hole is opened from the upper support surface to the inside, which is perpendicular to the tie rod hole and connected to the tie rod hole; the additive printing assembly is a combination of split additive printing parts assembled;

[0007] The profiling top plate and the profiling bottom plate are assembled to form a cavity for accommodating the additive printing assembly, and a process hole is provided on the profiling top plate. After the positioning mechanism positions the additive printing assembly, the profiling top plate and the profiling bottom plate complete the clamping and fixing of the additive printing assembly, and the clamped and fixed additive printing assembly is machined through the process hole;

[0008] The pull rod is a rod-shaped structure, the first end of which is connected to the locking pin by a lock, and a limit piece is installed on the second end to limit the movement of the pull rod into the pull rod hole; the first end of the pull rod and the rod body extend from the side of the contoured base plate into the interior of the contoured base plate, the lower end of the locking pin is assembled with the pull rod, and the upper end falls into the locking pin hole of the contoured base plate and has an adjustable height. When the upper end extends from the locking pin hole, it cooperates with the process hole or pre-processed hole on the lower mold surface of the additive printing assembly to position the additive printing assembly.

[0009] In combination with the first aspect, a bowl-shaped groove is provided at the first end of the pull rod, and the lower end of the locking pin is a spherical structure. When the pull rod moves in the pull rod hole of the contoured base plate along its length direction, the spherical structure at the lower end of the locking pin cooperates with the bowl surfaces at different heights in the bowl-shaped groove, driving the locking pin to move up and down, so that the upper end of the locking pin extends out or falls from the locking pin hole of the contoured base plate.

[0010] In combination with the first aspect, a "7"-shaped through hole is processed on the side of the second end of the pull rod, and the limiting member is a limiting pin; the "7"-shaped through hole includes a transverse hole and a vertical hole, the limiting member can move along the length direction of the pull rod in the transverse hole, and the limiting member can only move along the radial direction of the pull rod in the longitudinal hole, thereby limiting the movement of the pull rod into the contoured bottom plate and limiting the pull rod.

[0011] In combination with the first aspect, the second end of the pull rod is processed with an external thread, and the limiter cooperates with the second end thread. After the second end of the pull rod is screwed in and contacts the side of the contoured base plate, the pull rod is restricted from moving into the contoured base plate to limit the position of the pull rod.

[0012] In combination with the first aspect, the contoured bottom plate and the contoured top plate are rotatably connected via a rotating shaft or a hinge.

[0013] In a second aspect, a method for processing a split-type additively printed part comprises the following steps:

[0014] Select two external features or two internal features as references on any two split additive printed parts that have an assembly relationship, and mark the reference surfaces with cross-shaped lines. When marking the lines with the two internal features of the split additive printed parts as references, return the reference lines to the external surfaces of the parts.

[0015] The cross-shaped engraved mark of the reference is used as the basis for the repair of the assembly stop of the split additive printing part, and the assembly stop of the split additive printing part with an assembly relationship is repaired so that the reference engraved mark is aligned after the split additive printing parts are assembled;

[0016] Using the cross-shaped engraved mark of the reference as a coordinate reference point, a pre-processed hole is opened on the lower mold surface of the additive printing assembly, or an existing process hole on the lower mold surface of the additive printing assembly is selected;

[0017] Two sets of positioning mechanisms are used to position the additively printed assembly, and the additively printed assembly is clamped and fixed using a contoured bottom plate and a contoured top plate. After clamping and fixing, the locking pin retracts, and the assembled split additively printed parts are machined from the process holes opened on the contoured top plate.

[0018] In combination with the second aspect, in the step of selecting two external features or two internal features on any two split additive-printed parts that have an assembly relationship as references, the center points of the surfaces of four regular external features or four regular internal features on the two split additive-printed parts are collinear; or two regular internal features are selected on two split additive-printed parts that have an assembly relationship, and the two internal features on one split additive-printed part are positioned opposite to the two internal features on the other split additive-printed part.

[0019] In combination with the second aspect, in the step of marking the reference surface with cross-shaped lines, the cross-shaped lines of the two references on any split additively printed part have one line that is collinear and passes through the center points of the two references, and the other line passes through the center point of the reference surface and is perpendicular to the determined line.

[0020] In conjunction with the second aspect, in the step of aligning the reference mark lines after assembling the split-type additively printed parts, for the case where the center points of four regular external features or four regular internal feature surfaces on two split-type additively printed parts are collinear, aligning the reference mark lines after assembling the split-type additively printed parts means that: one of the cross-shaped mark lines of the four references passes through the center points of the four reference surfaces;

[0021] For the case where two internal features on one split additive printed part are positioned opposite to two internal features on another split additive printed part, the alignment of the reference mark lines after the split additive printed parts are assembled means that after the two split additive printed parts are assembled, the cross-shaped mark lines of the two relatively positioned references are completely aligned.

[0022] In combination with the second aspect, the lower mold surface of the additive printing assembly has at least two process holes or pre-processed holes.

[0023] A clamping device and processing method for a split type additively printed part provided by the present invention has the following beneficial effects:

[0024] The present invention provides a clamping device and processing method for split-type additively printed parts. Aiming at the problems of fast development cycle and high production efficiency required by the new process method of split-type additively printed and processed parts, a pull rod, a limit piece and a locking pin are used as the positioning mechanism of the parts, and a contoured pressure plate and a contoured top plate are used to quickly press in the positioning state to achieve accurate and rapid positioning and clamping, thereby improving the qualification rate and production efficiency of the machining process of split-type additively printed parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the clamping device for split additively printed parts.

[0026] Figure 2 It is a schematic diagram of the pull rod, locking pin and limit piece.

[0027] Figure 3 Schematic diagram of the split additively printed parts after assembly.

[0028] Figure 4 A cross-shaped mark on the reference surface. DETAILED DESCRIPTION

[0029] The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

[0030] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0031] like Figure 1 and Figure 2 As shown, the present invention provides a split-type clamping device for additively printed parts, comprising: a contoured bottom plate 1, a contoured top plate 2, a pull rod 4, a limiter 5 and a locking pin 6.

[0032] The contoured base plate 1 is fixed on the machine tool platform and is used to support the additive printing assembly. A pull rod hole is opened from the side to the inside, and a locking pin hole is opened vertically and connected to the pull rod hole from the upper supporting surface to the inside to install the pull rod 4 and the locking pin 6; the additive printing assembly is a combination of split additive printing parts assembled together.

[0033] The contoured top plate 2 is located above the contoured bottom plate 1, and forms a cavity for accommodating the additive printing assembly after being assembled with the contoured bottom plate 1. The contact surface of the cavity matches the top and bottom surfaces of the additive printing assembly. A process hole is provided on the contoured top plate 2 to allow the additive printing assembly to be clamped and fixed, and then the machining equipment can machine the additive printing assembly from the process hole.

[0034] Split additively printed parts need to be assembled into assemblies for surface milling, through-hole drilling and other machining. Figure 3 As shown, the split additive printing part includes additive part I and additive part II, which are assembled into an assembly. The contoured bottom plate 1 matches the bottom profile of the additive printing assembly (or additive part I), and the contoured top plate 2 matches the top profile of the additive printing assembly (or additive part II). The split additive printing part can also be three or more, not limited to Figure 3 shown.

[0035] In order to facilitate the clamping and positioning of the additive printing assembly by the profiling base plate 1 and the profiling top plate 2, such as the cooperation between the profiling base plate 1 and the profiling top plate 2 and the upper and lower surfaces of the additive printing assembly, the profiling base plate 1 and the profiling top plate 2 are rotatably connected via a rotating shaft 3 (or hinge).

[0036] The pull rod 4 is a rod-shaped structure, the first end of which is connected to the locking pin 6 by a lock, and the second end is installed with a limit piece 5 for limiting the movement of the pull rod 4 into the pull rod hole; the first end and the rod body of the pull rod 4 extend from the side of the contoured base plate 1 into the interior of the contoured base plate 1, the lower end of the locking pin 6 is assembled with the pull rod 4, and the upper end falls into the locking pin hole of the contoured base plate 1. When it extends from the locking pin hole, it cooperates with the process hole or pre-processed hole on the lower mold surface of the additive printing assembly to position the additive printing assembly.

[0037] As a preferred method, a "7"-shaped through hole is processed on the side of the second end of the pull rod 4, and the limit member 5 is a limit pin; the "7"-shaped through hole includes a transverse hole and a vertical hole, and the limit member 5 can move along the length direction of the pull rod 4 in the transverse hole, allowing the pull rod 4 to adjust the degree of extension into the contoured base plate 1, and the limit member 5 can only move radially along the pull rod 4 in the longitudinal hole, limiting the movement of the pull rod 4 into the contoured base plate 1, thereby limiting the pull rod 4.

[0038] As a preferred method, the second end of the pull rod 4 is processed with an external thread, and the limiter 5 cooperates with the second end thread. After the second end of the pull rod is screwed in and contacts the side of the contoured base plate 1, the pull rod 4 is restricted from moving into the contoured base plate 1, thereby limiting the position of the pull rod 4.

[0039] Since the positioning of the additive printing assembly requires at least two positioning points, the matching pull rod 4, limiter 5 and locking pin 6 are two groups, which cooperate with the two groups of process holes or pre-processed holes on the lower mold surface of the additive printing assembly to implement positioning. Figure 1 As shown, the clamping device has two sets of matching pull rods 4, limit members 5 and locking pins 6. The two sets of pull rods 4 enter the interior of the contoured base plate 1 from both sides of the contoured base plate 1 respectively, and cooperate with the two process holes or pre-processed holes on the lower mold surface of the additive printing assembly through two locking pins 6 to complete the positioning of the additive printing assembly.

[0040] A bowl-shaped groove is provided at the first end of the pull rod 4, and the lower end of the locking pin 6 is a spherical structure. When the pull rod 4 moves in the pull rod hole of the profiling base plate 1 along its length direction, the spherical structure at the lower end of the locking pin 6 cooperates with the bowl surface at different heights in the bowl-shaped groove, driving the locking pin 6 to move up and down, so that the upper end of the locking pin 6 extends out of or falls from the locking pin hole of the profiling base plate 1. When the upper end of the locking pin 6 extends out of the locking pin hole, it is the positioning state of the additive printing assembly. In the positioning state, the limiter 5 is pushed into the vertical hole from the transverse hole of the "7"-shaped through hole, or the limiter 5 is screwed into the external thread of the second end, and the limiter 5 contacts the side of the profiling base plate 1 to limit the movement of the pull rod 4 into the profiling base plate 1. The position of the additive printing assembly on the profiling base plate 1 is positioned by the locking pin 6, and the profiling base plate 1 and the profiling top plate 2 are closed to clamp and fix the additive printing assembly.

[0041] After the additive printing assembly is clamped and fixed, machining operations are performed. In order to avoid interference with machining equipment when performing longitudinal through-punching on the additive printing assembly, the upper end of the locking pin 6 is required not to extend out of the locking pin hole, so as to release the positioning state of the additive printing assembly. The additive printing assembly is only clamped and fixed by the contoured bottom plate 1 and the contoured top plate 2. To this end, the limit member 5 is pushed from the vertical hole of the "7"-shaped through hole into the horizontal hole, or the limit member 5 is unscrewed from the external thread at the second end, and the pull rod 4 is moved along the length direction of the pull rod 4 to reduce the height of the locking pin 6.

[0042] The present invention also provides a method for processing a split-type additively printed part, comprising the following steps:

[0043] S1, using two external features or two internal features of the split additive printed part as the reference, and marking the reference surface with cross-shaped lines respectively, when marking the lines with two internal features of the split additive printed part as the reference, return the reference lines to the external surface of the part. External features refer to the features located on the external surface of the additive printed assembly after the split additive printed part is assembled, and internal features refer to the features located inside the additive printed assembly after the split additive printed part is assembled.

[0044] Before performing surface milling, through-hole punching and other machining on additively printed assemblies, the split additively printed parts need to be assembled, but the additive printing molding method usually causes assembly errors in the assembly stop. To improve assembly accuracy, according to the design drawings, select two regular external features or two regular internal features on any two split additively printed parts that have an assembly relationship, and the center points of the four regular external features or four regular internal features are collinear; or select two regular internal features on two split additively printed parts that have an assembly relationship, and the two internal features on one split additively printed part are located opposite to the two internal features on the other split additively printed part; select the external features or internal features determined above as the datum of the split additively printed parts and mark them with cross-shaped engraved lines. For the cross-shaped engraved line marking of the two datums on any split additively printed part, one of the engraved lines is collinear and passes through the center points of the two datums, and the other engraved line passes through the center point of the datum surface and is perpendicular to the determined engraved line, see Figure 4 .

[0045] S2, using the cross-shaped engraved mark of the above-mentioned reference as the basis for repairing the assembly stop of the split additive printing part, and repairing the assembly stop so that the reference engraved mark of the split additive printing part is aligned after assembly, thereby reducing the error of the overall processing after assembly.

[0046] When the reference point selection in step S1 is as follows: according to the design drawing, two regular external features or two regular internal features are selected on any two split additively printed parts that have an assembly relationship, and the center points of the four regular external features or four regular internal features are collinear, the reference mark alignment after the parts are assembled means that one of the cross-shaped marks of the four references passes through the center point of the four reference surfaces (that is, one of the cross-shaped marks of any reference is collinear with one of the cross-shaped marks of the remaining three references).

[0047] When the reference point selection in step S1 is as follows: according to the design drawing, two regular internal features are respectively selected on any two split additive-printed parts that have an assembly relationship, and the two internal features on one split additive-printed part are positioned relative to the two internal features on the other split additive-printed part, the alignment of the reference scale marks after the parts are assembled means that after the two split additive-printed parts are assembled, the cross scale marks of the two relatively positioned references are completely aligned.

[0048] S3, using the cross-shaped engraved mark of the reference as a coordinate reference point, opening a pre-processed hole on the lower mold surface of the additive printing assembly, or selecting an existing process hole on the lower mold surface of the additive printing assembly.

[0049] S4, using two sets of positioning mechanisms to position the additively printed assembly, using the contoured bottom plate and the contoured top plate to clamp and fix the additively printed assembly, after clamping and fixing, the locking pin retracts, and the assembled split additively printed parts are machined from the process holes opened on the contoured top plate.

[0050] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0051] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A split type additive printing parts clamping device, characterized in that: It comprises a contoured bottom plate (1), a contoured top plate (2) and two sets of positioning mechanisms, each set of positioning mechanisms comprising a pull rod (4), a limiting member (5) and a locking pin (6); The contoured bottom plate (1) supports the additive printing assembly, has a pull rod hole opened from the side to the inside, and has a locking pin hole opened vertically and connected to the pull rod hole from the upper supporting surface to the inside; The additive printing assembly is a combination of separate additive printing parts assembled; The profiling top plate (2) and the profiling bottom plate (1) are assembled to form a cavity for accommodating the additive printing assembly, and a process hole is provided on the profiling top plate (2). After the positioning mechanism positions the additive printing assembly, the profiling top plate (2) and the profiling bottom plate (1) complete the clamping and fixing of the additive printing assembly, and the clamped and fixed additive printing assembly is machined through the process hole; The pull rod (4) is a rod-shaped structure, the first end of which is connected to the locking pin (6) by a lock, and the second end is installed with a limiter (5) for limiting the movement of the pull rod (4) into the pull rod hole; the first end of the pull rod (4) and the rod body extend from the side of the contoured base plate (1) into the interior of the contoured base plate (1), the lower end of the locking pin (6) is assembled with the pull rod (4), and the upper end falls into the locking pin hole of the contoured base plate (1) and is height-adjustable; when the upper end extends from the locking pin hole, it cooperates with the process hole or pre-processed hole on the lower mold surface of the additive printing assembly to position the additive printing assembly.

2. The clamping device for split-type additively printed parts according to claim 1 is characterized in that: A bowl-shaped groove is formed at the first end of the pull rod (4), and the lower end of the locking pin (6) is a spherical structure. When the pull rod (4) moves in the pull rod hole of the contoured base plate (1) along its length direction, the spherical structure at the lower end of the locking pin (6) cooperates with the bowl surface at different heights in the bowl-shaped groove, driving the locking pin (6) to move up and down, so that the upper end of the locking pin (6) extends out of or falls from the locking pin hole of the contoured base plate (1).

3. The clamping device for split-type additively printed parts according to claim 1, characterized in that: A "7"-shaped through hole is processed on the side surface of the second end of the pull rod (4), and the limiting member (5) is a limiting pin; the "7"-shaped through hole includes a transverse hole and a vertical hole, and the limiting member (5) can move along the length direction of the pull rod (4) in the transverse hole, and the limiting member (5) can only move along the radial direction of the pull rod (4) in the longitudinal hole, thereby limiting the movement of the pull rod (4) into the contoured bottom plate (1) and limiting the pull rod (4).

4. The clamping device for split-type additively printed parts according to claim 1, characterized in that: The second end of the pull rod (4) is processed with an external thread, and the limiting member (5) cooperates with the second end thread. After the second end of the pull rod is screwed in and contacts the side of the contoured base plate (1), the pull rod (4) is restricted from moving into the contoured base plate (1), thereby limiting the position of the pull rod (4).

5. The clamping device for split-type additively printed parts according to claim 1, characterized in that: The contoured bottom plate (1) and the contoured top plate (2) are rotatably connected via a rotating shaft (3) or a hinge.

6. A method for processing a split-type additively printed part, characterized in that: The following steps are involved: Select two external features or two internal features as references on any two split additive printed parts that have an assembly relationship, and mark the reference surfaces with cross-shaped lines. When marking the lines with the two internal features of the split additive printed parts as references, return the reference lines to the external surfaces of the parts. The cross-shaped engraved mark of the reference is used as the basis for the repair of the assembly stop of the split additive printing part, and the assembly stop of the split additive printing part with an assembly relationship is repaired so that the reference engraved mark is aligned after the split additive printing parts are assembled; Using the cross-shaped engraved mark of the reference as a coordinate reference point, a pre-processed hole is opened on the lower mold surface of the additive printing assembly, or an existing process hole on the lower mold surface of the additive printing assembly is selected; Two sets of positioning mechanisms are used to position the additively printed assembly, and the additively printed assembly is clamped and fixed using a contoured bottom plate and a contoured top plate. After clamping and fixing, the locking pin retracts, and the assembled split additively printed parts are machined from the process holes opened on the contoured top plate.

7. The method for processing a split-type additively printed part according to claim 6, characterized in that: In the step of selecting two external features or two internal features as references on any two split additive-printed parts that have an assembly relationship, the center points of the surfaces of four regular external features or four regular internal features on the two split additive-printed parts are collinear; or two regular internal features are selected on the two split additive-printed parts that have an assembly relationship, and the two internal features on one split additive-printed part are positioned opposite to the two internal features on the other split additive-printed part.

8. The method for processing a split-type additively printed part according to claim 6, characterized in that: In the step of marking the reference surface with cross-shaped engraved lines, the cross-shaped engraved lines of the two references on any split additively printed part have one engraved line that is collinear and passes through the center points of the two references, and the other engraved line passes through the center point of the reference surface and is perpendicular to the determined engraved line.

9. The method for processing a split-type additively printed part according to claim 6, characterized in that: In the step of aligning the reference mark lines after assembling the split-type additively printed parts, for the case where the center points of four regular external features or four regular internal feature surfaces on two split-type additively printed parts are collinear, aligning the reference mark lines after assembling the split-type additively printed parts means that: one of the cross-shaped mark lines of the four references passes through the center points of the four reference surfaces; For the case where two internal features on one split additive printed part are positioned opposite to two internal features on another split additive printed part, the alignment of the reference mark lines after the split additive printed parts are assembled means that after the two split additive printed parts are assembled, the cross-shaped mark lines of the two relatively positioned references are completely aligned.

10. The method for processing a split-type additively printed part according to claim 6, characterized in that: The lower mold surface of the additive printing assembly has at least two process holes or pre-processed holes.

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