CN205271457U - A anchor clamps for processing turbine blade steam passage - Google Patents

Abstract

The utility model relates to a fixture for processing the steam passage of a steam turbine blade, which relates to the field of fixtures for the steam passage of a steam turbine blade. The utility model aims to solve the existing problems of unstable clamping and inaccurate positioning of profile blocks during numerically controlled machining of steam channel profiles, resulting in poor processing quality of blades. The connecting plate, the clamping seat, the profiled line positioning block, the positioning seat and the profiled line clamping block of the utility model form a frame structure to fix the blade, the connecting plate is fixed on the machine tool, and the inner arc profiled line of the blade root is connected to the profiled line positioning block. At the end of the molded line, the positioning seat is a U-shaped groove structure, and the blade and the positioning block are wrapped in the U-shaped groove of the positioning seat. The positioning seat is connected with the profiled line positioning block. The side wall of the transverse end is connected, the back arc of the blade root is connected with one end of the profiled line clamping block, and the other end of the profiled line clamping block is connected with the clamping seat through a cylindrical end screw. It is used to clamp the blade.

Description

A Fixture for Machining Steam Turbine Blades

technical field

The utility model relates to a fixture used for processing the steam passage of a steam turbine blade. The utility model belongs to the field of fixtures for the steam passage of steam turbine blades.

Background technique

Some blades of the steam turbine are twisted regularly, so that the overlapping area of the steam inlet side and the steam outlet side of the blade root part is very small, and there is a situation of unstable clamping when CNC machining the steam channel profile. Inaccurate positioning and unstable clamping can easily cause waste products during production and processing. It has a great influence on the quality control of the product.

Utility model content

The utility model aims to solve the existing problems of unstable clamping and inaccurate positioning of profile blocks during numerically controlled machining of steam channel profiles, resulting in poor processing quality of blades. A fixture for processing steam turbine blade steam passages is now provided.

A fixture for processing the steam passage of a steam turbine blade, which includes a connecting plate, a square head cylindrical end screw, a hexagonal thin nut, a clamping seat, a positioning pin, a profile positioning block, a slotted screw, a positioning seat, a flat key, a square Cap screws, hexagon nuts, parallel pins, hexagon socket head screws and profile clamping blocks,

The clamping seat, the profiled line positioning block, the positioning seat and the profiled line clamping block are all arranged on the upper end of the connection plate,

The connection plate is a disc-shaped structure, and a positioning pin is set at the center of the connection plate, and the positioning pin fixes the bottom of the blade and the connection plate together;

The profiled line end of the profiled line positioning block engages the inner arc profiled line side of the blade root, the positioning seat is a U-shaped groove structure, and the blade and the positioning block are wrapped in the U-shaped groove of the positioning seat, and one vertical end of the positioning seat passes through the slot The screw is connected with the positioning end of the profiled line positioning block,

The upper surfaces of the two transverse ends of the positioning seat are fixed on the connecting plate by straight pins and hexagon socket head screws, and the steam inlet and outlet sides of the blade and the side walls of the two transverse ends of the positioning seat pass through the square head circle. Head screws and hexagon nuts are fixedly connected,

The inner side of the profile clamping block engages the back arc side of the blade root, and the outer side of the profile clamping block is connected to the cylindrical end screw, and the cylindrical end screw is covered with a clamping seat and a hexagonal thin nut, and the hexagonal thin nut is used for locking and clamping seat,

The upper surface of the clamping seat fixes the clamping seat on the connecting plate by means of hexagon socket head cap screws.

The beneficial effects of the utility model are as follows: the clamping part of the fixed blade is composed of a frame structure by using the connection plate, the clamping seat, the profile positioning block, the positioning seat and the profile clamping block; The positioning and clamping of the type structure make it stable and non-rotating during the process of CNC machining the steam channel, and the positioning of the molded line block ensures its accurate positioning. The design of this structure not only satisfies the processing requirements of this type of blade steam channel, but also realizes the universal design of the fixture, which greatly saves the manufacturing cost. The processing quality of the blade is improved. The pass rate of blades has been increased by about 15%, which has laid a solid foundation for subsequent assembly.

Description of drawings

Fig. 1 is a front view of a fixture for processing steam turbine blade steam passages described in Embodiment 1;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a front view of a steam turbine blade, reference numeral 16 is the steam passage part, reference numeral 17 is the blade root, reference numeral 18 is the inner arc of the blade root, and reference numeral 19 is the back arc of the blade root;

Fig. 4 is a top view of Fig. 3, reference numeral 20 is the steam inlet side, and reference numeral 21 is the steam outlet side.

detailed description

Specific embodiment 1: This embodiment is described in detail with reference to FIGS. 1 to 4. A fixture for processing steam turbine blade steam passages described in this embodiment includes a connecting plate 1, a square head cylindrical end screw 2, a hexagonal thin Nut 3, clamping seat 4, positioning pin 5, profile positioning block 6, slotted screw 7, positioning seat 8, flat key 9, square head round head screw 10, hex nut 11, straight pin 12, hexagon socket head screw 13 and profile clamping block 14,

The clamping seat 4, the profile positioning block 6, the positioning seat 8 and the profile clamping block 14 are all arranged on the upper end of the connection plate 1,

The connection plate 1 is a disc-shaped structure, and a positioning pin 5 is set at the center of the connection plate 1, and the positioning pin 5 fixes the bottom of the blade and the connection plate 1 together;

The profile end of the profile positioning block 6 engages the inner arc profile side of the blade root, the positioning seat 8 is a U-shaped groove structure, and the blade and the positioning block 6 are wrapped in the U-shaped groove of the positioning seat 8, and one of the positioning seats 8 The vertical end is connected with the positioning end of the molding line positioning block 6 through the slotted screw 7,

The upper surfaces of the two transverse ends of the positioning seat 8 are fixed on the connecting plate 1 by straight pins 12 and hex socket head cap screws 13, and the steam inlet and outlet sides of the blade are connected with the two transverse ends of the positioning seat 8. The side walls are fixedly connected by square head round head screws 10 and hex nuts 11,

The inner side of the molded line clamping block 14 engages the back arc side of the blade root, and the outer side of the molded line clamping block 14 is connected to the cylindrical end screw 2, and the cylindrical end screw 2 is covered with a clamping seat 4 and a hexagonal thin nut 3, and the hexagonal thin nut 3 is used to lock the clamping seat 4,

The upper surface of the clamping seat 4 fixes the clamping seat 4 on the connection plate 1 by means of hexagon socket head cap screws 13 .

Specific examples:

First, the fixture is connected to the CNC machine tool, and the blade to be processed is placed in the fixture frame to ensure that the end surface of the blade root is in contact with the end surface of the positioning pin 5 to complete the positioning in the length direction. The inner arc of the blade root is in close contact with the profile line positioning block 6 in the frame to complete the positioning in the axial direction. Secondly, tighten the screws of the steam inlet or outlet side and the back arc clamping mechanism of the blade root to complete the clamping. Finally, the entire processing part is clamped by tightening the crown of the blade with the thimble of the machine tool itself.

Specific embodiment 2: This embodiment is a further description of a fixture for processing steam turbine blade steam passage described in specific embodiment 1. In this embodiment, it also includes positioning connecting bosses and flat keys, positioning connecting bosses One end of the platform is connected to the center of the bottom of the connecting plate 1, the other end of the positioning connecting boss is connected to the machine tool, and the flat key is arranged at the bottom of the connecting plate 1.

Specific embodiment three: This embodiment is a further description of a fixture for processing steam turbine blade steam passages described in specific embodiment two. In this embodiment, four U grooves are uniformly arranged on the connecting plate 1, and the The four U grooves are fixedly connected with the machine tool by bolts.

Working principle: first design the connection plate 1, and then design the connection plates of appropriate size, namely φC and H, according to the selection of production and processing CNC machine tools. According to the position and size of the connecting hole in the center of the machine tool, the size of the positioning connecting boss φA and the flat key 9 of the positioning part are designed, and finally the U groove is designed to be fixedly connected to the machine tool through bolts.

Design of the clamping blade part

According to the processing and positioning requirements, the fixture is positioned by the steam inlet side of the blade root or the steam outlet side of the blade root and the inner radial shape of the blade root, and the back arc of the blade root is assisted by the clamping method. The details are as follows, first of all, it should be ensured that the center of the blade to be processed is consistent with the center of the fixture. According to the size of the blade root, the positioning seat of the frame member 8 is correspondingly designed, and the dimensional tolerance of L is designed according to the size of the blade root steam inlet side and the steam outlet side of the blade to be processed. Secondly, in order to meet the processing requirements of blade roots of different lengths, the fixture is designed with positioning pins 5 at the bottom. Finally, the positioning block 6 is fixed on the positioning seat 8 through the slotted screw 7 according to the profile line design part of the blade root. The positioning seat 8 is connected with the connection plate 1 through a cylindrical pin 12 and a hexagon socket head cap screw 13 . This completes the design of the positioning part of the fixture. For better clamping, threaded holes are processed on the steam inlet side and the steam outlet side of the positioning seat 8 through square head cylindrical end screws 10 and hexagon nuts 11 to assist in tightening.

The clamping part is designed, and the clamping mechanism composed of the square head round head screw 2, the hexagonal thin nut 3 and the clamping seat 4 is designed in the back arc direction of the blade root. It is connected with the connection plate 1 by the hexagon socket head cap screw 13. In order to increase the clamping force, a molded line clamping block 14 is designed on the back arc of the blade root. Increase the tightening area. Guaranteed stable performance during processing. This completes the overall design of the set of fixtures.

Claims (3)

1. A fixture for processing steam turbine blade steam passage, it is characterized in that it includes connecting plate (1), square head cylindrical end screw (2), hexagonal thin nut (3), clamping seat (4), positioning Pin (5), shaped line positioning block (6), slotted screw (7), positioning seat (8), flat key (9), square head round head screw (10), hex nut (11), cylindrical pin ( 12), hexagon socket cap screw (13) and molded line clamping block (14), The clamping seat (4), the profile positioning block (6), the positioning seat (8) and the profile clamping block (14) are all arranged on the upper end of the connection plate (1), The connection plate (1) has a disc-shaped structure, and a positioning pin (5) is arranged at the center of the connection plate (1), and the positioning pin (5) fixes the bottom of the blade and the connection plate (1) together; The molded line end of the profiled line positioning block (6) engages the inner arc profiled line side of the blade root, the positioning seat (8) is a U-shaped groove structure, and the blade and the positioning block (6) are wrapped in the U-shaped surface of the positioning seat (8). In the groove, one vertical end of the positioning seat (8) is connected with the positioning end of the profile positioning block (6) through a slotted screw (7), The upper surfaces of the two transverse ends of the positioning seat (8) are fixed on the connecting plate (1) by straight pins (12) and socket head cap screws (13). The side walls of the steam side and the two transverse ends of the positioning seat (8) are fixedly connected by square head round head screws (10) and hex nuts (11), The inner side of the molded wire clamping block (14) engages the back arc side of the blade root, and the outer side of the molded wire clamping block (14) is connected with the cylindrical end screw (2), and the cylindrical end screw (2) is covered with a clamping seat (4 ) and the hexagonal thin nut (3), the hexagonal thin nut (3) is used to lock the clamping seat (4), The upper surface of the clamping seat (4) fixes the clamping seat (4) on the connection plate (1) by means of hexagon socket head cap screws (13). 2. A fixture for processing steam turbine blade steam passages according to claim 1, characterized in that it also includes a positioning connecting boss and a key, and one end of the positioning connecting boss is connected to the bottom of the connecting plate (1). At the center position, the other end of the positioning connection boss position is connected to the machine tool, and the flat key is arranged at the bottom of the connection plate (1). 3. A fixture for processing steam turbine blade steam passages according to claim 2, characterized in that four U-grooves are evenly arranged on the connection plate (1), and the four U-grooves are fixedly connected with the machine tool by bolts .