A turbine intermediate disk internal expansion positioning device

Abstract

This invention provides an internal expansion positioning device for a turbine intermediate disk. The clamping body has positioning pin holes, in which circular pins and diamond pins are installed. The clamping body also has threaded countersunk holes. A tensioning unit is internally installed in the threaded countersunk holes. The tensioning unit includes an inner expansion sleeve, a tapered column, a strong spring, and an upper tapered column. After the inner expansion sleeve is fitted onto the tapered column, the tapered column is inserted into the strong spring. The upper tapered column is installed at the top of the tapered column, which has a threaded hole. A hexagonal bolt is fixed through the threaded hole. The clamping body has a stop, and the turbine intermediate disk is installed in the stop. This invention solves the problem of low surface quality caused by vibration during the machining of turbine intermediate disks, improving the surface quality of the turbine intermediate disk. The strong clamping force of the tensioning unit enables high feed rates and heavy cutting during machining, improving machining efficiency. The tensioning unit can clamp different models of turbine intermediate disks by changing the inner expansion sleeve.

Description

Technical Field

[0001] This invention belongs to the field of gas turbines, specifically relating to a turbine intermediate disk internal expansion positioning device. Background Technology

[0002] The turbine intermediate disk is a crucial component of a gas turbine, located between the turbine rotor and the casing. Its primary function is support and fixation. The design of the gas turbine intermediate disk requires consideration of multiple factors, including strength and durability at high temperatures, good thermal conductivity, and appropriate cooling measures. Due to the high and uneven temperature distribution in the turbine components' operating environment, the intermediate disk must be manufactured from high-strength, high-temperature-resistant materials. Previously, the machining positioning device for turbine intermediate disks consisted of a pressure plate and a stop; the workpiece was placed within the stop and fixed by clamping the pressure plate. This method suffers from drawbacks because the positioning device only provides axial clamping force and lacks radial positioning capability, resulting in large machining amplitudes, complex alignment steps, poor surface finish, and a tendency for workpiece deflection. Summary of the Invention

[0003] The purpose of this invention is to provide a turbine intermediate disk internal expansion positioning device that solves problems such as lack of radial positioning capability, large processing amplitude, complex alignment steps, poor processing surface quality, and easy workpiece deflection.

[0004] A turbine intermediate disk internal expansion positioning device includes a clamp body; the clamp body is provided with a positioning pin hole, and a circular pin and a diamond pin are installed in the positioning pin hole; the clamp body is also provided with a threaded countersunk hole; a tensioning unit is installed in the threaded countersunk hole, the tensioning unit includes an inner expansion sleeve, a conical column, a strong spring and an upper conical column; after the inner expansion sleeve is fitted onto the conical column, the conical column is inserted into the strong spring, the upper conical column is installed on the top of the conical column, the top of the conical column is provided with a threaded hole, and a hexagonal bolt is fixed through the threaded hole; the clamp body is provided with a stop, and the turbine intermediate disk is installed in the stop.

[0005] Furthermore, the outer edge of the fixture body is provided with multiple threaded lifting holes, and the lifting ring is connected to the fixture body through the threaded lifting holes to lift the tooling onto the machine tool worktable.

[0006] Furthermore, the outer diameter of the inner expansion jacket is 0.1 mm smaller than the bore diameter of the turbine intermediate disk.

[0007] Furthermore, the length of the high-strength spring is greater than the natural distance between the conical column, the upper conical column, and the inner expansion sleeve.

[0008] Furthermore, the surfaces of the circular pins and diamond pins are plated with copper.

[0009] Furthermore, the fixture body is evenly distributed with multiple positioning pin holes and threaded countersunk holes.

[0010] The beneficial effects of this invention are as follows:

[0011] This invention solves the problem of low surface quality caused by vibration during the machining of turbine intermediate disks by using a tight fit between the circular pin, the diamond pin, and the fixture body stop, and by allowing for flexible and quick replacement. It improves the surface quality of the turbine intermediate disks. The tensioning unit has strong clamping force, which can achieve large feed rates and heavy cutting during machining, thus improving machining efficiency. The tensioning unit can clamp different models of turbine intermediate disks by changing the inner tensioning sleeve. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall assembly of the present invention;

[0013] Figure 2 This is a schematic diagram of the internal expansion fastening unit of the present invention;

[0014] Figure 3 This is a cross-sectional view of the internal expansion fastening unit of the present invention;

[0015] Figure 4 This is a schematic diagram of the clamp body of the present invention;

[0016] Figure 5 This is a schematic diagram illustrating the use of the present invention. Detailed Implementation

[0017] The present invention will now be further described with reference to the accompanying drawings.

[0018] like Figures 1-5 As shown, a turbine intermediate disk internal expansion positioning device includes a clamp body 1; the clamp body 1 is provided with a positioning pin hole 10, and a circular pin 2 and a diamond pin 3 are installed in the positioning pin hole 10; the clamp body 1 is also provided with a threaded countersunk hole 11; a tensioning unit is installed in the threaded countersunk hole 11, the tensioning unit includes an inner expansion sleeve 4, a conical column 5, a strong spring 6 and an upper conical column 7; after the inner expansion sleeve 4 is fitted onto the conical column 5, the conical column 5 is inserted into the strong spring 6, the upper conical column 7 is installed on the top of the conical column 5, the top of the conical column 5 is provided with a threaded hole, and a hexagonal bolt 8 is fixed through the threaded hole; the clamp body 1 is provided with a stop, and the turbine intermediate disk is installed in the stop.

[0019] The turbine intermediate disk is inserted into the stop of the fixture body 1. The end face of the turbine intermediate disk is tapped with a rubber hammer so that the bottom surface of the turbine intermediate disk is in contact with the end face of the fixture body 1. The distance between the end face of the fixture body and the bottom surface of the turbine intermediate disk is 0.02mm. The hexagonal bolts on the tensioning unit are tightened to tighten the inner hole of the workpiece, and the internal expansion positioning is completed. The lower surface of the tapered column 5 needs to be in contact with the upper end face of the fixture body 1 at a distance of 0.02mm.

[0020] The fixture body 1 has multiple threaded lifting holes 9 on its outer edge. The lifting ring 12 is connected to the fixture body 1 through the threaded lifting holes 9 to lift the fixture onto the machine tool worktable. T-blocks, bolts, pressure plates, washers, and nuts fix the fixture body onto the machine tool worktable.

[0021] The above technical solutions make it easier to install and remove lifting rings, saving installation and disassembly time and improving lifting efficiency.

[0022] Among them, the outer diameter of the inner expansion jacket 4 is 0.1 mm smaller than the bore diameter of the turbine intermediate disk.

[0023] The above technical solution satisfies the requirement that the upper conical column 7 presses down through the tapered expansion sleeve to tighten the space, preventing the situation where the aperture and the outer diameter of the inner expansion sleeve are not compatible, thus preventing the tightening and fixing from being impossible.

[0024] Among them, the length of the strong spring 6 is greater than the natural distance between the conical column 5, the upper conical column 7 and the inner expansion sleeve 4.

[0025] With the above technical solution, when tightening the hexagonal bolt 8, the strong spring 6 should be in a compressed state so as to loosen the hexagonal bolt 8, the upper conical column of the strong spring 6, and prevent the conical column 5 and the inner expansion sleeve 4 of the upper conical column 7 from forming a self-locking state, making the parts impossible to disassemble.

[0026] Among them, the round pin 2 and the diamond pin 3 are plated with copper.

[0027] The above technical solution effectively prevents scratches on the surface of the hole when loading the workpiece.

[0028] The internal expansion unit uses a fastening method of 4 units in a group, together with round pin 2 and diamond pin 3, for internal expansion positioning, so as to achieve better part processing effect.

[0029] Among them, the bottom diameters of the circular pin 2 and the rhomboid pin 3 are fitted with the positioning pin hole 10 on the fixture body 1 with a small clearance. The radial degree of freedom of the turbine intermediate disk is restricted by the "one side and two pins" positioning method, which prevents the turbine intermediate disk from rotating and shifting during the machining process, reduces vibration and improves the surface quality of the machined surface.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A turbine intermediate disk internal expansion positioning device, characterized in that, The fixture includes a main body (1); the main body (1) is provided with a positioning pin hole (10), and a round pin (2) and a diamond pin (3) are installed in the positioning pin hole (10). The bottom diameter of the round pin (2) and the diamond pin (3) are fitted with the positioning pin hole (10) on the main body (1) with a small clearance. The radial degree of freedom of the turbine intermediate disk is restricted by the one-sided two-pin positioning method; the main body (1) is also provided with a threaded countersunk hole (11); a tensioning unit is installed in the threaded countersunk hole (11). The tensioning unit includes an inner tensioning sleeve (4), a conical column (5), and a strong force. The spring (6) and the upper conical column (7) have an inner expansion sleeve (4) with an outer diameter 0.1 mm smaller than the diameter of the hole in the turbine intermediate disk. After the inner expansion sleeve (4) is fitted onto the conical column (5), the conical column (5) is inserted into the strong spring (6). The upper conical column (7) is installed on the top of the conical column (5). The top of the conical column (5) has a threaded hole, and the hexagonal bolt (8) is fixed through the threaded hole. The length of the strong spring (6) is greater than the natural distance between the conical column (5), the upper conical column (7), and the inner expansion sleeve (4). The fixture body (1) has a stop, and the turbine intermediate disk is installed in the stop. When tightening the hexagonal bolt (8), the strong spring (6) should be in a compressed state to loosen the hexagonal bolt (8). The strong spring (6) is placed on the upper conical column to prevent the inner expansion sleeve (4) of the conical column (5) and the upper conical column (7) from forming a self-locking state, making the parts impossible to disassemble. The inner expansion unit adopts a fastening method of 4 units in a group, combined with the round pin (2) and the diamond pin (3) for inner expansion positioning, so as to achieve better part processing effect. The turbine intermediate disk is inserted into the stop of the fixture body (1). The end face of the turbine intermediate disk is struck with a rubber hammer so that the bottom surface of the turbine intermediate disk is attached to the end face of the fixture body (1). The distance between the end face of the fixture body and the bottom surface of the turbine intermediate disk is 0.02mm. The hexagonal bolts on the tensioning unit are tightened to tighten the inner hole of the workpiece and complete the internal expansion positioning. The lower surface of the tapered column (5) needs to be attached to the upper end face of the fixture body (1) at 0.02mm.

2. The turbine intermediate disk internal expansion positioning device according to claim 1, characterized in that, The outer edge of the fixture body (1) is provided with multiple threaded lifting holes (9). The lifting ring (12) is connected to the fixture body (1) through the threaded lifting holes (9) to lift the tooling onto the machine tool worktable.

3. The turbine intermediate disk internal expansion positioning device according to claim 1, characterized in that, The surfaces of the circular pin (2) and the rhomboid pin (3) are plated with copper.

4. The turbine intermediate disk internal expansion positioning device according to claim 1, characterized in that, The fixture body (1) is evenly distributed with multiple positioning pin holes (10) and threaded countersunk holes (11).

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