CN115351563A - Clamp for milling blisk - Google Patents

Abstract

The application provides a fixture for integral blade ring milling, which belongs to the technical field of aero-engines, and specifically includes a symmetrically arranged cover plate and a base, both of which are circular in structure, and the parts to be processed are placed between the cover plate and the base , and the processing part of the part to be processed is exposed outside, and the cover plate and the base are fixed and clamped by connecting pieces; the cover plate and the base are equipped with quick-change device mechanisms, and one of the two quick-change device mechanisms is connected to the processing Machine tool cooperation, when the parts to be processed need to be turned over, replace it with another one of the quick change device mechanism to cooperate with the processing machine tool; both the cover plate and the base are equipped with angular positioning precision balls, which are used for positioning to be processed The position of the part. Through the processing scheme of the present application, the existence of milling steps caused by excessive angular deviation is avoided, and the milling accuracy is improved; the clamping and dismounting is convenient, the processing preparation time is shortened, and the production efficiency is improved.

Description

A milling fixture for integral leaf ring

technical field

The present application relates to the technical field of aero-engines, in particular to a milling fixture for an integral leaf ring.

Background technique

The integral leaf ring is a new type of integral structure key part used in advanced aero-engines, and is an important component of aero-engines. The closed integral leaf ring is composed of three parts: inner ring, outer ring, blade and flow channel, which is a complex integrated thin-walled structure. Due to the limitation of the inner and outer ring structures, the milling tool can only be processed from the intake and exhaust sides. If the part is clamped once to complete the blade milling, the machine tool spindle will interfere and collide with the shaft during milling, so the blade of the overall blade ring Type milling requires two flipping processes; the traditional clamping method is to position the inner or outer ring of the part in the circular direction, and use several pressure plates to compress, and the air inlet or exhaust edge is completely exposed to the outside. After the remaining milling, The part is manually dismantled and turned over for clamping. The integral leaf ring is a thin-walled part. After removing the large margin, the cutting force causes the part to produce different degrees of elastic deformation. The recovery of the elastic deformation leads to the processing error of the part. In addition, the residual stress in the processing causes the part to have different degrees of deformation. There are plane and circular runouts out of tolerance when turning over the clamping and aligning the parts, requiring manual alignment, lengthening the preparation cycle, and there are uncertain factors; in addition, there is an inherent angular error in the clamping system, resulting in two There is a certain deviation in the milling coordinate system. The position of the indirect tool in milling is too large, and the quality of the indirect tool is difficult to guarantee, which brings great difficulties to the subsequent polishing and dimensional accuracy.

Contents of the invention

In view of this, the embodiment of the present application provides a milling fixture for integral leaf ring, which is used for fast turning and milling and clamping of the integral leaf ring of an aero-engine, so as to prevent angular distortion caused by manual disassembly of parts for turning and clamping. The error caused the middle step of milling to be too large, avoiding the scrapping of parts.

An embodiment of the present application provides a jig for milling an integral leaf ring. The jig includes a symmetrically arranged cover plate and a base. Both the base and the cover plate have a circular structure, and the parts to be processed are placed on the cover plate and the base. Between the bases, and the processing parts of the parts to be processed are exposed outside, the cover plate and the base are fixed and clamped by connecting pieces; the cover plate and the base are equipped with fast A change device mechanism, one of the two quick change device mechanisms cooperates with the processing machine tool, and when the part to be processed needs to be turned over, it is replaced by the other of the quick change device mechanisms to cooperate with the processing machine tool; Both the cover plate and the base are provided with angular positioning precision balls, and the angular positioning precision balls are used to position the parts to be processed.

According to a specific implementation manner of the embodiment of the present application, the quick change device mechanism includes a plurality of pull studs, and the pull studs on the cover plate and the base are vertically connected.

According to a specific implementation of the embodiment of the present application, the number of the pull studs is set to six, one of the pull studs is set at the center of the cover plate/the base, and the other five pull studs are circumferential Evenly distributed.

According to a specific implementation of the embodiment of the present application, positioning pins are provided on the base, and the positioning pins are aligned with the pin holes of the parts to be processed for clamping, and the positioning pins are used to limit the position of the parts to be processed. rotation.

According to a specific implementation manner of the embodiment of the present application, the angular positioning precision ball is arranged on the circumferential side of the base and the cover plate, and the angular direction of the angular positioning precision ball is consistent with that of the positioning pin. same angle.

According to a specific implementation of the embodiment of the present application, the cover plate and the base are symmetrically provided with bolt holes, and the threaded holes are evenly arranged around the periphery of the quick change device mechanism, and the cover plate and the base are fixed and clamped through the bolt holes through the connecting piece.

According to a specific implementation manner of the embodiment of the present application, the connecting member is installed in the bolt hole by sinking.

According to a specific implementation manner of the embodiment of the present application, the connecting member is configured as a hexagonal cylindrical head connecting screw.

According to a specific implementation manner of the embodiment of the present application, the bolt holes are set as M12 bolt holes.

Beneficial effect

The overall leaf ring milling fixture in the embodiment of this application adopts the form of "hamburger" to fix the parts, and quickly completes the two clamping of the parts and the machine tool through the quick change device mechanism, without disassembling the parts, ensuring that the parts are deformed after milling with a large margin The amount is controllable and consistent, avoiding the step of the intermediate knife-joining position caused by the deformation of the disassembled parts and the difference in the angle of the second clamping of the flipping, which improves the accuracy of milling.

The invention adopts two angular positioning precision ball structures. Before the first milling process of the part, the position of the precision ball at the front end is measured to determine its A-axis coordinate system. Make adjustments based on the results to ensure that the front and rear machining coordinate systems are consistent, and avoid the existence of milling steps caused by excessive angular deviation.

The clamp structure is simple, the clamping and dismounting is convenient, the processing preparation time is shortened, and the production efficiency is improved. The positioning and pressing of the processing tooling provided by the invention and the quick change device are highly versatile, and can be widely used in the processing of the same type and large batches of integral leaf rings. Suitable for popularization and use in this field.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is a perspective view of a jig for milling an integral leaf ring according to an embodiment of the present invention;

Fig. 2 is a perspective view of a milling jig for an integral leaf ring according to an embodiment of the present invention;

Fig. 3 is a top view of a jig for milling an integral blade ring according to an embodiment of the present invention;

Fig. 4 is a side view of a milling jig for an integral blade ring according to an embodiment of the present invention;

Figure 5 is an enlarged view of the L place in Figure 3;

Fig. 6 is A-A sectional view among Fig. 3;

Fig. 7 is B-B sectional view among Fig. 3;

Fig. 8 is a schematic diagram of the clamping and cooperation between the integral blade ring milling fixture and the machine tool according to an embodiment of the present invention.

In the figure: 1. Quick change device mechanism; 2. Cover plate; 3. Parts to be processed; 4. Angular positioning accuracy ball; 5. Base; 6. Hexagonal cylindrical head connecting screw; 7. Bolt hole; 8. Positioning pin ; 9. The inner circle end face of the part; 10. The inner circle; 11. The mating surface of the fixture and the machine tool.

Detailed ways

Embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

Embodiments of the present application are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. The present application can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

It is noted that the following describes various aspects of the embodiments that are within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is illustrative only. Based on the present application one skilled in the art should appreciate that an aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, any number of the aspects set forth herein can be used to implement an apparatus and/or practice a method. In addition, such an apparatus may be implemented and/or such a method practiced using other structure and/or functionality than one or more of the aspects set forth herein.

It should also be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic idea of the application, and only the components related to the application are shown in the drawings rather than the number, shape and number of components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

Additionally, in the following description, specific details are provided to facilitate a thorough understanding of examples. However, it will be understood by those skilled in the art that the described aspects may be practiced without these specific details.

An embodiment of the present application provides a jig for milling an integral leaf ring, which will be described in detail below with reference to FIGS. 1 to 8 .

Referring to Figures 1 to 4, the fixture includes a symmetrically arranged cover plate 2 and a base 5, the base 5 and the cover plate 2 are both circular structures, and the parts to be processed 3 are placed on the cover plate 2 and the between the bases 5, and the processed part of the part 3 to be processed is exposed outside, and the cover plate 2 and the base 5 are fixed and clamped by connecting pieces. Both the cover plate 2 and the base 5 are provided with a quick change device mechanism 1, one of the two quick change device mechanisms 1 cooperates with the processing machine tool, and when the part 3 to be processed needs to be turned over, it is replaced by The other of the quick change device mechanism 1 cooperates with the processing machine; the cover plate 2 and the base 5 are provided with an angular positioning precision ball 4, and the angular positioning precision ball 4 is used for positioning The position of the part 3 to be processed.

Further, the quick change device mechanism 1 includes a plurality of pull studs, and the pull studs on the cover plate 2 and the base 5 are vertically connected. In this embodiment, controlled by the pneumatic device of the machine tool, the fixture is connected to the machine tool through a pull nail. When the machine tool and the fixture are assembled, referring to the mating surface 11 of the fixture and the machine tool in FIG. The pull stud on one side is connected to the machine tool. When one side of the part 3 to be processed is finished, it is only necessary to disassemble the overall fixture and replace it with the pull stud on the other side to connect with the machine tool. There is no need to disassemble the part 3 to be processed, ensuring the Fast flip milling ensures precise positioning between the fixture and the machine tool.

Preferably, there are six pull studs, one of which is set at the center of the cover plate 2/the base 5, and the remaining five pull studs are evenly distributed in the circumferential direction of φ272.

In the above-mentioned embodiment, a quick-change device in the form of a "hamburger" is used to fix the part 3 to be processed between the tool base 5 and the cover plate 2, and the part to be processed is exposed to the outside. In order to limit the rotation of the part 3 to be processed, the Base 5 is provided with positioning pin 8, with reference to Fig. 5, described positioning pin 8 is aligned with the pin hole of described workpiece 3 to be processed and clamped, and described positioning pin 8 is used to limit the rotation of described workpiece 3 to be processed, cooperates The connection between the base 5 and the cover plate 2 realizes the positioning and pressing of the parts, and at the same time realizes the limitation of the degree of freedom of the axial direction of the parts, and the radial positioning restricts the lateral sliding of the parts. In order to ensure the positioning and pressing requirements of the parts, the tolerance of the matching gap between the radial positioning position and the parts is within 0.03mm.

In one embodiment, the angular positioning precision ball 4 is arranged on the peripheral side of the base 5 and the cover plate 2, referring to Fig. 4 and Fig. 7, and the angular direction of the angular positioning precision ball 4 is in line with The angular orientations of the positioning pins 8 are the same, that is, the angular positioning accuracy balls 4 on the base 5 and the cover plate 2 are symmetrically arranged, and both have the same angular orientations as the positioning pins 8 . After the part is turned over and clamped, the position of the angular positioning accuracy ball 4 is measured to ensure that the turning angle is consistent with the previous step.

In one embodiment, the cover plate 2 and the base 5 are symmetrically provided with bolt holes 7, and the threaded holes are evenly arranged around the periphery of the quick change device mechanism 1, and the cover plate 2 and the The bases 5 are fixed and clamped through the bolt holes 7 through the connecting piece. In order to prevent the connecting piece from being obstructed during milling, the connecting piece is sunk-mounted in the bolt hole 7 , see FIG. 6 and FIG. 7 .

Preferably, the connecting piece is set as a hexagonal cylindrical head connecting screw 6. It should be noted that the form of the connecting piece is not limited to the ones listed in this embodiment, and the selection is based on the fact that the cover plate 2 and the base 5 can be connected. .

Preferably, the bolt holes 7 are set as M12 bolt holes.

In actual clamping, first use the inner circle end face 9 and the inner circle 10 of the part 3 to be processed as the positioning surface, refer to Figure 7, install the part 3 to be processed on the base 5, and align the positioning pin 8 with the part 3 to be processed. Align the pin hole of the pin hole to limit the rotation of the part, clamp the cover plate 2 of the clamp, and then use the hexagonal cylindrical head connecting screw 6 to fix the part and the fixture to form a "hamburger" clamping method to realize the positioning and compression of the part. At the same time, the restriction of the degree of freedom in the axial direction of the restricted part is realized, and the radial positioning restricts the lateral sliding of the part. Controlled by the pneumatic device of the machine tool, the fixture is connected to the machine tool through the quick change device mechanism 1, without dismantling the parts, ensuring fast turning and milling of the parts, and accurate positioning between the fixture and the machine tool; when milling one side of the part 3 to be processed, by measuring The position of the angular positioning accuracy ball 4 is used to ensure the A-axis coordinate system of the part processing; when the part is turned over and clamped to mill the other side, measure the position of the angular positioning accuracy ball 4 on the other side and adjust according to the results to ensure that the front and rear The machining coordinate system is kept consistent to avoid the existence of milling steps caused by excessive angular deviation.

The above is only a specific embodiment of the application, but the scope of protection of the application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. All should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (9)

1. A fixture for integral leaf ring milling, characterized in that, the fixture includes a symmetrically arranged cover plate and a base, both of the base and the cover plate have a circular structure, and the parts to be processed are placed on the cover plate and the base, and the processing part of the part to be processed is exposed outside, and the cover plate and the base are fixed and clamped by connecting pieces; the cover plate and the base are equipped with A quick change device mechanism, one of the two quick change device mechanisms cooperates with the processing machine tool, and when the part to be processed needs to be turned over, it is replaced by the other of the quick change device mechanisms to cooperate with the processing machine tool; Both the cover plate and the base are provided with angular positioning precision balls, and the angular positioning precision balls are used to position the parts to be processed. 2. The overall blade ring milling jig according to claim 1, wherein the quick change device mechanism includes a plurality of pull studs, and the pull studs on the cover plate and the base are vertically connected . 3. The overall leaf ring milling fixture according to claim 2, characterized in that there are six pull studs, one of which is set at the center of the cover plate/the base, and the other five pull studs are set at the center of the cover plate/the base. The pull studs are uniformly distributed in the circumferential direction. 4. The overall leaf ring milling fixture according to claim 1, characterized in that, the base is provided with a positioning pin, the positioning pin is aligned with the pin hole of the part to be processed and clamped, and the positioning pin Used to limit the rotation of the part to be machined. 5. The overall blade ring milling fixture according to claim 4, characterized in that, the angular positioning precision ball is arranged on the circumferential side of the base and the cover plate, and the angular positioning precision ball The angular direction is the same as that of the positioning pin. 6. The milling jig for an integral leaf ring according to claim 1, wherein bolt holes are symmetrically provided on the cover plate and the base, and the threaded holes surround the outer periphery of the quick change device mechanism Arranged uniformly, the cover plate and the base are fixed and clamped through the bolt holes through the connecting piece. 7. The milling jig for integral blade ring according to claim 6, characterized in that, the connecting piece is installed in the bolt hole by sinking. 8 . The milling jig for integral blade ring according to claim 6 or 7 , characterized in that, the connecting piece is set as a hexagonal cylindrical head connecting screw. 8 . 9. The milling jig for integral leaf ring according to claim 6 or 7, characterized in that, the bolt holes are set as M12 bolt holes.

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