A split type clamping device and processing method of additive printing parts

Abstract

The application provides a split type additive printing part clamping device and processing method, which comprises a profiling bottom plate, a profiling top plate and two sets of positioning mechanisms; the profiling top plate and the profiling bottom plate form a cavity for accommodating an additive printing assembly after being assembled, and a process hole is formed on the profiling top plate; after the positioning mechanisms position the additive printing assembly, the profiling top plate and the profiling bottom plate complete clamping and fixing of the additive printing assembly, and the clamped and fixed additive printing assembly is machined through the process hole; and the positioning mechanisms position the additive printing assembly. The split type additive printing part clamping device and processing method provided by the application can quickly complete positioning and machining of the split type additive printing part, and improve positioning accuracy, clamping efficiency and part qualification rate during machining.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of clamping devices, and particularly relates to a split type additive printing part clamping device and a machining method. BACKGROUND

[0002] In the field of aerospace, products are constantly developing along the trend of hollowing, thin-walled lightweight design, and special shape structure. The process scheme of combining additive printing technology with mechanical machining is gradually emerging. After split type additive printing parts are formed by additive printing technology, they need to be assembled into an assembly, and then the surface of the assembly is milled, and the assembly is punched through for machining. At present, the deformation trend after additive printing forming cannot be kept consistent, and the profile tolerance of the split type additive printing part is relatively poor, which indirectly causes time-consuming and laborious clamping adjustment of the split type additive printing part in the assembled state during mechanical machining, poor positioning accuracy of batch machining, and affects the production efficiency and machining quality of the product. Therefore, it is necessary to solve the problems of time-consuming and laborious clamping during mechanical machining and poor positioning accuracy of batch machining after additive printing of such products, so as to improve the overall production efficiency and qualification rate of such products. SUMMARY

[0003] In order to overcome the deficiencies in the prior art, the present application provides a split type additive printing part clamping device and a machining method, which can quickly complete positioning and machining of the split type additive printing part, and improve positioning accuracy, clamping efficiency and part qualification rate during machining.

[0004] The technical scheme provided by the present application is as follows:

[0005] In a first aspect, a split type additive printing part clamping device includes a profiling bottom plate, a profiling top plate, and two sets of positioning mechanisms, each set of positioning mechanisms including a pull rod, a limiting piece, and a locking pin.

[0006] The profiling bottom plate supports the additive printing assembly, has a pull rod hole opened from the side to the inside, and has a locking pin hole opened from the upper support surface to the inside and perpendicular and connected to the pull rod hole; the additive printing assembly is a combined assembly after assembly of the split type additive printing parts;

[0007] The profiling top plate and the profiling bottom plate form a cavity accommodating the additive printing assembly after assembly, and the profiling top plate has a process hole opened thereon. After the positioning mechanisms position the additive printing assembly, the profiling top plate and the profiling bottom plate complete clamping and fixing of the additive printing assembly, and the additive printing assembly clamped and fixed is machined through the process hole.

[0008] The pull rod is a rod-shaped structure, the first end is connected with the locking pin through a lock, and the second end is provided with a limiting piece for limiting movement of the pull rod into the pull rod hole; the first end of the pull rod and the rod body extend into the inside of the profiling bottom plate from the side surface of the profiling bottom plate, the lower end of the locking pin is assembled with the pull rod, the upper end falls into the locking pin hole of the profiling bottom plate and is adjustable in height, and when the upper end extends out of the locking pin hole, the upper end cooperates with the process hole or the pre-processed hole on the lower die surface of the additive printing assembly to position the additive printing assembly.

[0009] In combination with the first aspect, the first end of the pull rod is provided with a bowl-shaped groove, the lower end of the locking pin is a spherical surface structure, and when the pull rod moves in the pull rod hole of the profiling bottom plate along the length direction, the spherical surface structure of the lower end of the locking pin cooperates with the bowl surface at different heights in the bowl-shaped groove to drive the upper end of the locking pin to extend out of the locking pin hole of the profiling bottom plate or to fall down.

[0010] In combination with the first aspect, the side surface of the second end of the pull rod is processed with a "7" type through hole, and the limiting piece is a limiting pin rod; the "7" type through hole includes a horizontal hole and a vertical hole, the limiting piece can move in the horizontal hole along the length direction of the pull rod, and the limiting piece can only move in the vertical hole along the radial direction of the pull rod to limit movement of the pull rod into the profiling bottom plate.

[0011] In combination with the first aspect, the second end of the pull rod is processed with external threads, the limiting piece cooperates with the second end threads, and after the second end of the pull rod is screwed into and contacts the side surface of the profiling bottom plate, movement of the pull rod into the profiling bottom plate is limited, and the pull rod is limited.

[0012] In combination with the first aspect, the profiling bottom plate and the profiling top plate are rotationally connected through a rotating shaft or a hinge.

[0013] The second aspect is a processing method of a split additive printing part, including the following steps:

[0014] Two external features or two internal features are selected as references on any two split additive printing parts in an assembly relationship, and cross-shaped line markings are made on the reference surfaces, and when the internal features of the split additive printing parts are used as the references to make the line markings, the reference line is returned to the external surface of the part;

[0015] The cross-shaped line markings of the references are used as the basis for repairing the split additive printing part assembly joints, the split additive printing part assembly joints in the assembly relationship are repaired, and the reference line markings are aligned after the split additive printing parts are assembled;

[0016] The cross-shaped line markings of the references are used as coordinate reference points, pre-processed holes are made on the lower die surface of the additive printing assembly, or existing process holes on the lower die surface of the additive printing assembly are selected;

[0017] Two positioning mechanisms are used to position the additive printing assembly, a profiling bottom plate and a profiling top plate are used to clamp and fix the additive printing assembly, and after clamping and fixing, the locking pin is retracted, and the machining is performed on the assembled split additive printing parts through the process holes on the profiling 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 printing parts in assembly as references, the center points of the four regular external feature surfaces or the four regular internal feature surfaces on the two split additive printing parts are collinear; or two regular internal features are selected on the two split additive printing parts in assembly, and the two internal features on one split additive printing part are opposite to the two internal features on the other split additive printing part.

[0019] In combination with the second aspect, in the step of marking the reference surfaces with cross-shaped scribe lines, two reference surfaces on any split additive printing part are marked with cross-shaped scribe lines, one of which is collinear and passes through the center points of the two references, and the other of which passes through the center point of the reference surface and is perpendicular to the determined scribe line.

[0020] In combination with the second aspect, in the step of aligning the reference scribe line marks after assembly of the split additive printing parts, for the case that the center points of the four regular external feature surfaces or the four regular internal feature surfaces on the two split additive printing parts are collinear, the alignment of the reference scribe line marks after assembly of the split additive printing parts means that one of the cross-shaped scribe lines of the four references passes through the center points of the four reference surfaces.

[0021] For the case that the two internal features on one split additive printing part are opposite to the two internal features on the other split additive printing part, the alignment of the reference scribe line marks after assembly of the split additive printing parts means that the cross-shaped scribe lines of the two sets of references opposite in position are completely aligned after assembly of the two split additive printing parts.

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

[0023] The clamping device and the machining method for split additive printing parts provided by the present application have the following beneficial effects:

[0024] The application provides a split type additive printing part clamping device and a machining method. BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION OF THE INVENTION BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A split type additive printing part clamping device schematic diagram.

[0026] Figure 2 A pull rod, locking pin and limiting piece schematic diagram.

[0027] Figure 3 An assembled split type additive printing part schematic diagram.

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

[0029] The characteristics and advantages of the application will become more apparent from the following detailed description of the application.

[0030] The special word "exemplary" here means "as an example, embodiment or illustrative". Any embodiment described as "exemplary" here is not necessarily interpreted as superior or better than other embodiments.

[0031] As shown in Figure 1 and Figure 2 , the application provides a split type additive printing part clamping device, which comprises a profiling bottom plate 1, a profiling top plate 2, a pull rod 4, a limiting piece 5 and a locking pin 6.

[0032] The profiling bottom plate 1 is fixed on the machine tool platform and is used to support the additive printing assembly, which is internally provided with a pull rod hole from the side surface and a locking pin hole vertically and in communication with the pull rod hole from the upper support surface, so as to install the pull rod 4 and the locking pin 6; the additive printing assembly is the combined assembly after the split type additive printing part is assembled.

[0033] The profiling top plate 2 is located above the profiling bottom plate 1 and forms a cavity containing the additive printing assembly after being assembled with the profiling bottom plate 1, and the cavity contact surface matches the top profile and the bottom profile of the additive printing assembly; the profiling top plate 2 is provided with a process hole, so that the machine tool equipment can machine the additive printing assembly from the process hole after the additive printing assembly is clamped and fixed.

[0034] The split type additive printing part needs to be assembled into an assembly for surface milling, through-hole drilling and other machining. As shown inFigure 3 As shown, the split additive printing part includes additive part I and additive part II, which are assembled into an assembly. The profiling bottom plate 1 matches the bottom profile of the additive printing assembly (or additive part I), and the profiling 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 As shown.

[0035] In order to facilitate the clamping and positioning of the profiling bottom plate 1 and the profiling top plate 2 to the additive printing assembly, such as the cooperation of the profiling bottom plate 1 and the profiling top plate 2 with the upper and lower profiles of the additive printing assembly, the profiling bottom plate 1 and the profiling top plate 2 are rotationally connected by the rotating shaft 3 (or the hinge).

[0036] The pull rod 4 is a rod structure, the first end is connected with the locking pin 6 through the lock, and the second end is provided with the limiting 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 into the inside of the profiling bottom plate 1 from the side of the profiling bottom plate 1, the lower end of the locking pin 6 is assembled with the pull rod 4, the upper end falls into the locking pin hole of the profiling bottom plate 1, and when the upper end extends out of the locking pin hole, it cooperates with the process hole or the pre-machining hole on the lower profile of the additive printing assembly to position the additive printing assembly.

[0037] As a preferred mode, the second end side of the pull rod 4 is processed with a "7" type through hole, and the limiting piece 5 is a limiting pin rod; the "7" type through hole includes a horizontal hole and a vertical hole, the limiting piece 5 can move in the length direction of the pull rod 4 in the horizontal hole, allowing the pull rod 4 to adjust the extension degree in the inside of the profiling bottom plate 1, and the limiting piece 5 can only move in the radial direction of the pull rod 4 in the vertical hole, limiting the movement of the pull rod 4 into the profiling bottom plate 1, and limiting the pull rod 4.

[0038] As a preferred mode, the second end of the pull rod 4 is processed with external threads, and the limiting piece 5 cooperates with the second end threads to limit the movement of the pull rod 4 into the profiling bottom plate 1 after the second end of the pull rod is screwed into and contacts the side of the profiling bottom plate 1, and to limit the pull rod 4.

[0039] Since the positioning of the additive printing assembly requires at least two positioning points, the matched pull rod 4, limiting piece 5 and locking pin 6 are two groups, which cooperate with two groups of process holes or pre-machining holes on the lower profile of the additive printing assembly to implement positioning. For example Figure 1 As shown, the clamping device has two groups of matched pull rods 4, limiting pieces 5 and locking pins 6, two groups of pull rods 4 respectively enter the inside of the profiling bottom plate 1 from the two sides of the profiling bottom plate 1, and cooperate with two process holes or pre-machining holes on the lower profile of the additive printing assembly through two locking pins 6 to complete the positioning of the additive printing assembly.

[0040] The first end of the pull rod 4 is provided with a bowl-shaped groove, the lower end of the locking pin 6 is a spherical surface structure, when the pull rod 4 moves in the pull rod hole of the profiling bottom plate 1 along the length direction, the spherical surface structure of the lower end of the locking pin 6 cooperates with the bowl surface at different heights in the bowl-shaped groove, drives the locking pin 6 to move up and down, and the upper end of the locking pin 6 extends out of or falls into the locking pin hole of the profiling bottom 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 limiting piece 5 is pushed into the vertical hole from the horizontal hole of the "7" type through hole, or the limiting piece 5 is screwed on the external thread of the second end, the limiting piece 5 contacts the side surface of the profiling bottom plate 1, and the movement of the pull rod 4 into the profiling bottom plate 1 is limited. The position of the additive printing assembly on the profiling bottom plate 1 is positioned by the locking pin 6, the profiling bottom plate 1 and the profiling top plate 2 are closed, and the additive printing assembly is clamped and fixed.

[0041] After the additive printing assembly is clamped and fixed, in order to avoid interference to the machining instrument when the additive printing assembly is longitudinally perforated, the upper end of the locking pin 6 does not extend out of the locking pin hole, the positioning state of the additive printing assembly is released, and only the additive printing assembly is clamped and fixed by the profiling bottom plate 1 and the profiling top plate 2, for this, the limiting piece 5 is pushed into the horizontal hole from the vertical hole of the "7" type through hole, or the limiting piece 5 is screwed out of the external thread of the second end, the pull rod 4 is moved along the length direction, and the height of the locking pin 6 is lowered.

[0042] In the present application, a machining method of a split additive printing part is also provided, comprising the following steps:

[0043] S1, taking two outer features or two inner features of the split additive printing part as the reference, and marking the reference surface with cross-shaped lines, when marking the reference surface with cross-shaped lines taking two inner features of the split additive printing part as the reference, the reference line is returned to the outer surface of the part. The outer feature refers to the feature of the split additive printing part after assembly, which is located on the outer surface of the additive printing assembly, and the inner feature refers to the feature of the split additive printing part after assembly, which is located inside the additive printing assembly.

[0044] Before machining such as surface milling and through-hole drilling of an additive printing assembly, the split additive printing parts need to be assembled. However, the additive printing forming method usually causes assembly errors of the assembly joints. In order to improve the assembly accuracy, according to the design drawing, two regular external features or two regular internal features, four regular external features or four regular internal feature surfaces of any two split additive printing parts in assembly relationship are selected, and the center points of the four regular external features or four regular internal feature surfaces are collinear; or two regular internal features of any two split additive printing parts in assembly relationship are selected, and the two internal features of one split additive printing part are opposite to the two internal features of the other split additive printing part; the above-mentioned external features or internal features are selected as the reference of the split additive printing parts and are marked with cross-line markings. For the cross-line markings of the two references on any split additive printing part, one of the cross-line markings is collinear and passes through the center points of the two references, and the other cross-line marking passes through the center point of the reference surface and is perpendicular to the determined cross-line marking, as shown in Figure 4 .

[0045] S2, the cross-line markings of the above-mentioned references are used as the basis for repairing the assembly joints of the split additive printing parts, the assembly joints are repaired, the reference cross-line markings are aligned after the split additive printing parts are assembled, and the error of the overall machining after assembly is reduced.

[0046] When the reference points are selected in step S1, according to the design drawing, two regular external features or two regular internal features of any two split additive printing parts in assembly relationship are selected, and the center points of the four regular external features or four regular internal feature surfaces are collinear, and the reference cross-line markings are aligned after the parts are assembled, which means that one of the cross-line markings of the four references passes through the center points of the surfaces of the four references (i.e. one of the cross-line markings of any reference is collinear with one of the cross-line markings of the other three references).

[0047] When the reference points are selected in step S1, according to the design drawing, two regular internal features of any two split additive printing parts in assembly relationship are selected, and the two internal features of one split additive printing part are opposite to the two internal features of the other split additive printing part, and the reference cross-line markings are aligned after the parts are assembled, which means that the cross-line markings of the two groups of references opposite to each other are completely aligned after the two split additive printing parts are assembled.

[0048] S3, the cross-line markings of the references are used as the coordinate reference points, a pre-machining hole is opened on the lower surface of the additive printing assembly, or an existing process hole on the lower surface of the additive printing assembly is selected.

[0049] S4, the additive printing assembly is positioned by using two sets of positioning mechanisms, is clamped and fixed by using a profiling bottom plate and a profiling top plate, and after clamping and fixing, a locking pin is retracted, and the machined additive printing part after assembly is machined from a process hole formed in the profiling top plate.

[0050] The present application is described in detail above in connection with specific embodiments and exemplary examples, but these descriptions cannot be understood as limiting the present application. Those skilled in the art understand that the technical solutions and embodiments of the present application can be variously replaced, modified or improved without deviating from the spirit and scope of the present application, and these all fall within the scope of the present application. The protection scope of the present application is subject to the appended claims.

[0051] The contents not described in detail in the specification of the present application are the known technology of those skilled in the art.

Claims

1. A clamping device for a split-type additively printed part, characterized in that, It includes a contoured base plate (1), a contoured top plate (2), and two sets of positioning mechanisms. Each set of positioning mechanisms includes a pull rod (4), a limiting component (5), and a locking pin (6). The contour base plate (1) supports the additive printing assembly. A tie rod hole is opened from the side to the inside, and a locking pin hole is opened vertically from the upper support surface to the inside and connects to the tie rod hole. The additive printing assembly is a combination of separate additive printing parts assembled together. After the top plate (2) and the bottom plate (1) are assembled, they form a cavity to accommodate the additive printing assembly. Process holes are opened on the top plate (2). After the positioning mechanism positions the additive printing assembly, the top plate (2) and the bottom plate (1) clamp and fix the additive printing assembly. The additive printing assembly is then machined through the process holes. The pull rod (4) is a rod-shaped structure. The first end is connected to the locking pin (6) by a buckle. The second end is equipped with a limiting part (5) to restrict 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 into the interior of the contour base plate (1) from the side. The lower end of the locking pin (6) is assembled with the pull rod (4). The upper end falls into the locking pin hole of the contour base plate (1) and the height is adjustable. When the upper end extends out of the locking pin hole, it cooperates with the process hole or pre-processed hole on the lower surface of the additive printing assembly to position the additive printing assembly.

2. The clamping device for the split additive printing part according to claim 1, characterized in that, The first end of the pull rod (4) is provided with a bowl-shaped groove, and the lower end of the locking pin (6) is a spherical structure. When the pull rod (4) moves along its length in the pull rod hole of the contour base plate (1), 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, causing the locking pin (6) to move up and down, so that the upper end of the locking pin (6) extends out or falls from the locking pin hole of the contour base plate (1).

3. The clamping device for the split additive printing part according to claim 1, characterized in that, The second end of the pull rod (4) has a "7" shaped through hole machined on its side, and the limiting member (5) is a limiting pin. The "7" shaped through hole includes a horizontal hole and a vertical hole. The limiting member (5) can move along the length direction of the pull rod (4) in the horizontal hole and can only move radially along the pull rod (4) in the vertical hole, thus limiting the movement of the pull rod (4) into the contour base plate (1) and limiting the pull rod (4).

4. The clamping device for the split additive printing part according to claim 1, characterized in that, The second end of the pull rod (4) is machined with an external thread. The limiting member (5) is threaded with the second end. After the second end of the pull rod is screwed in and contacts the side of the contour base plate (1), the movement of the pull rod (4) into the contour base plate (1) is restricted, thus limiting the pull rod (4).

5. The clamping device for the split additive printing part according to claim 1, characterized in that, The contoured bottom plate (1) and the contoured top plate (2) are rotatably connected by a pivot (3) or a hinge.

6. A method for processing a split-type additively printed part, characterized in that, The clamping device for the split additive printing part according to any one of claims 1 to 5 includes the following steps: On any two separate additively printed parts that have an assembly relationship, select two external features or two internal features as references, and mark the reference surfaces with cross-shaped scribing. When marking the references with two internal features of the separate additively printed parts as references, return the reference scribing to the external surface of the part. The reference cross-shaped engraving marks are used as the basis for fitting the assembly stop of the split additive printing parts. The assembly stop of the split additive printing parts with assembly relationship is fitted so that the reference engraving marks are aligned after the split additive printing parts are assembled. Using the cross-shaped engraving mark as a reference point, pre-machined holes are made on the lower surface of the additively printed assembly, or existing process holes on the lower surface of the additively printed assembly are selected. Two sets of positioning mechanisms are used to position the additively printed assembly. The additively printed assembly is clamped and fixed using a contoured base plate and a contoured top plate. After clamping and fixing, the locking pin retracts, and the assembled split additively printed parts are machined through the process holes opened on the contoured top plate.

7. The processing method for a split 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 separate additively printed parts that have an assembly relationship, the center points of the four regular external features or four regular internal features on the two separate additively printed parts are collinear; or two regular internal features are selected on the two separate additively printed parts that have an assembly relationship, and the two internal features on one separate additively printed part are positioned opposite to the two internal features on the other separate additively printed part.

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

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

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

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