Turbopump blade body curved surface milling clamp

Abstract

The utility model belongs to the field of aviation turbine pump blade machining and manufacturing, and relates to a turbine pump blade body curved surface milling clamp which comprises a mounting base, a connecting disc, a connecting screw, a lower supporting block, an upper supporting block and a supporting base. The mounting seat is connected with a machine tool spindle chuck; the blades are screwed into the connecting disc through the external threads; the connecting disc is matched with the mounting seat through an inner hole; meanwhile, a blade left-end key slot is matched with a mounting seat right-end convex key; the lower supporting block and the upper supporting block clamp the blade right end process chuck; the supporting base is connected with a machine tool auxiliary spindle. The fastening lower supporting block and the upper supporting block are connected with the supporting seat through connecting screws; the blade clamping device has the advantages that the structure is simple, the manufacturing is convenient, the blade clamping is stable, the blade machining vibration can be reduced, and the blade machining precision is improved.

Description

Technical Field

[0001] The utility model belongs to the field of machining and manufacturing of aviation turbine pump blades, and relates to a milling fixture for the blade body curved surface of a turbine pump blade. Background Art

[0002] The turbine pump provides a power source for the fuel system of a certain device of an aircraft, and converts the kinetic energy of the airflow during aircraft flight into the pressure energy of fuel. The turbine blade converts the kinetic energy of the high-speed airflow during aircraft flight into the mechanical energy of turbine rotation. The blade body curved surface of the turbine pump blade belongs to a complex curved surface, with a large twist of the blade body curved surface and high dimensional accuracy requirements. The machining quality of the blade body curved surface directly affects the performance of the turbine pump.

[0003] The traditional machining methods of the blade include electrolytic finish machining of the blade body curved surface, polishing the curved surface after precision forging, or die forging the blade blank and leaving a margin for finish machining the blade. Electrolytic machining requires a special electrolytic machining machine tool and electrolytic tools; precision forging machining requires multiple forging operations on the blade body, and the curved surface needs to be trimmed and polished against a template after each forging operation. The production cycle is long, the accuracy is not easy to guarantee, and the cost is high during the small-batch production and trial production of aviation products. When machining the blade with a die forging part, the die forging part machining method always reserves a process chuck, and the blade body curved surface is machined by the methods of clamping one end and supporting the other end, clamping one end and pulling the other end, or floating support clamping. Due to the long overhang of the blade and the poor rigidity of the blade body curved surface, the jacking force and pulling force change at any time during the material removal process of the part, resulting in part vibration and deformation, which has a great impact on the machining accuracy of the blade body curved surface. Therefore, it is necessary to optimize the machining fixture for the specific blade body curved surface to reduce the vibration and deformation during the machining of the blade body curved surface and improve the machining accuracy and surface quality of the blade. Content of the Utility Model

[0004] The purpose of the utility model: Aiming at the deficiencies existing in the above-mentioned prior art, the utility model patent provides a milling fixture for the blade body curved surface of a turbine pump blade.

[0005] Technical Solution:

[0006] A milling fixture for the blade body curved surface, the milling fixture for the blade body curved surface includes a mounting base 1, a connecting disc 3, connecting screws 5, a lower support block 6, an upper support block 7, and a support seat 9; the mounting base 1 is connected to the machine tool spindle chuck; the blade 4 is screwed into the connecting disc 3 through an external thread; the connecting disc 3 is matched with the mounting base 1 through an inner hole, and at the same time, the keyway at the left end of the blade 4 is matched with the raised key at the right end of the mounting base 1; the lower support block 6 and the upper support block 7 clamp the process chuck at the right end of the blade 4; the support seat 9 is connected to the machine tool sub-spindle; the connecting screws 5 connect and fasten the lower support block 6, the upper support block 7 and the support seat 9; there is a gap between the connecting screw 5 and the connecting hole of the upper support block 7.

[0007] Furthermore, it further includes fastening screws 2, and the fastening screws 2 fix the connecting disc 3 to the mounting base 1.

[0008] Further, it also includes a fastening screw 8 for fastening the lower support block 6 and the upper support block 7.

[0009] Further, the left end of the blade 4 has an external thread that mates with the internal thread of the inner hole of the adapter plate 3.

[0010] Further, the keyway on the left end face of the blade 4 is a cross keyway that is connected and matched with the raised key of the rectangular shape at the right end of the mounting seat 1.

[0011] Further, an outer circular boss is provided on the mounting seat 1, and the raised key is arranged on the outer circular boss. The inner hole of the connecting plate 3 is matched with the outer circular boss of the mounting seat 1, and the raised key on the outer circular boss of the mounting seat 1 is matched with the cross keyway on the end face of the blade 4. The fastening screw 2 fixes the connecting plate 3 together with the blade 4 to the mounting seat 1.

[0012] Further, the clearance between the connecting screw 5 and the connecting hole of the upper support block 7 is 0.5 mm.

[0013] Beneficial effects:

[0014] In the present utility model, the internal thread of the connecting plate is fixedly screwed with the external thread at the left end of the blade. When the connecting plate is connected to the mounting seat, it is necessary to rotate a certain angle to match the keyway at the left end of the blade with the raised key of the mounting seat. After the screw fixes the connecting plate and the mounting seat, the blade cannot rotate radially and is also limited axially, and is integrated with the chuck of the machine tool spindle. The upper and lower support blocks clamp the process chuck at the right end of the blade and are fixed with connecting screws. The support seat is connected to the sub-spindle of the machine tool. There is a certain clearance between the fastening screw and the connecting hole of the upper support block to compensate for the deformation during the previous process machining of the blade. The fastening screw clamps and connects the upper and lower support blocks to the support seat, realizing the functions of clamping at the left end and supporting at the right end, and the blade is in a free stress state during clamping and supporting, avoiding the deformation of the blade when the right end support is released after the machining of the blade body curved surface is completed.

[0015] The structure of the present utility model is simple, easy to manufacture, the blade clamping is stable, it can reduce the vibration during blade machining, and improve the machining accuracy of the blade. Description of the drawings

[0016] Figure 1 is a schematic diagram of a fixture for milling the curved surface of the blade body of the present utility model;

[0017] Figure 2 is Figure 1 a sectional view taken along A-A;

[0018] Figure 3 is an exploded view of the present utility model.

[0019] Description of reference numerals in the figure: 1 mounting base; 2 fastening screw; 3 connecting disc; 4 turbine blade; 5 connecting screw; 6 lower support block; 7 upper support block; 8 fastening screw; 9 support base. Detailed implementation mode

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] A milling fixture for the blade body surface of a turbine pump proposed by the present invention, and the milling fixture for the blade body surface of the turbine pump includes a mounting base 1, a fastening screw 2, a connecting disc 3, a turbine blade 4, a connecting screw 5, a lower support block 6, an upper support block 7, a fastening screw 8, and a support base 9.

[0022] The chuck of the machine tool spindle clamps the mounting base 1.

[0023] The external thread of the blade 4 is screwed into the internal thread of the connecting disc 3.

[0024] The keyway at the left end of the blade 4 cooperates with the convex key at the right end of the mounting base 1 to play an angular limiting role, and the blade 4 is driven to rotate by the mounting base 1 during subsequent processing.

[0025] The connecting disc 3 is fitted with the mounting base 1 through the inner hole.

[0026] The fastening screw 2 fixes the connecting disc 3 to the mounting base 1.

[0027] The lower support block 6 and the upper support block 7 clamp the process chucks at the two places at the right end of the blade 4.

[0028] The fastening screw 8 fastens the lower support block 6 and the upper support block 7 together.

[0029] The vice spindle of the machine tool clamps the support base 9.

[0030] The connecting screw 5 fixes the lower support block 6 and the upper support block 7 on the end face of the support base 9. There is an adjustment gap between the screw 5 and the inner hole of the upper support block 7 to ensure that the blade 4 is in a free state radially when connected to the support base 9, preventing deformation of the subsequent processed parts.

[0031] The fastening screw 2 fixes the connecting disc 3 to the mounting base 1.

[0032] Furthermore, as Figure 1, the spindle chuck drives the mounting base 1 to rotate, and the mounting base 1 drives the blade 4 to rotate through the raised keyway. The process chuck of the blade 4 fixes the right end of the blade to the support base 9 through the lower support block 6, the upper support block 7, the fastening screw 8 and the connecting screw 5, which plays a supporting role during the machining of the blade 4 and prevents the deformation of the part during machining.

[0033] Although the technical solution of the present invention has been described in detail, those skilled in the art can make reasonable changes, substitutions or deformations to the structure and content of the technical solution of this application. These changed or improved technical solutions all fall within the protection scope of this application.

Claims

1. A milling fixture for the blade body surface of a turbo pump blade, characterized in that The described milling fixture for blade surface includes a mounting base (1), a connecting disc (3), connecting screws (5), a lower support block (6), an upper support block (7), and a support seat (9); the mounting base (1) is connected to the machine tool spindle chuck; the blade (4) is screwed into the connecting disc (3) through an external thread; the connecting disc (3) is fitted with the mounting base (1) through an inner hole, and at the same time, the keyway at the left end of the blade (4) is fitted with the protruding key at the right end of the mounting base (1); the lower support block (6) and the upper support block (7) clamp the process chuck at the right end of the blade (4); the support seat (9) is connected to the machine tool sub-spindle; the connecting screws (5) connect the fastened lower support block (6), upper support block (7) and the support seat (9); there is a gap between the connecting screw (5) and the connecting hole of the upper support block (7).

2. The milling fixture for the blade body surface of the turbo pump blade according to claim 1, characterized in that It further includes a fastening screw (2), and the fastening screw (2) fixes the connecting disc (3) to the mounting base (1).

3. The milling fixture for the blade body surface of the turbo pump blade according to claim 1, characterized in that, It further includes a fastening screw (8), and the fastening screw (8) fastens the lower support block (6) and the upper support block (7).

4. The fixture for milling the blade body surface of a turbo pump blade according to claim 2, characterized in that The left end of the described blade (4) has an external thread, which is fitted with the internal thread of the inner hole of the connecting disc (3).

5. The machining fixture for the blade body surface milling of the turbo pump blade according to claim 4, characterized in that The keyway on the left end face of the described blade (4) is a cross keyway, which is fitted and connected with the rectangular protruding key at the right end of the mounting base (1).

6. The milling fixture for the blade body surface of the turbo pump blade according to claim 4, characterized in that, The mounting base (1) is provided with an outer circular boss, and the protruding key is arranged on the outer circular boss. The inner hole of the connecting disc (3) is fitted with the outer circular boss of the mounting base (1). The protruding key on the outer circular boss of the mounting base (1) is fitted with the cross keyway on the end face of the blade (4). The fastening screw (2) fixes the connecting disc (3) together with the blade (4) to the mounting base (1).

7. The milling fixture for the blade body surface of the turbo pump blade according to claim 1, characterized in that, The gap between the connecting screw (5) and the connecting hole of the upper support block (7) is 0.5 mm.

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