Anti-deformation machining tool for thin-journal steam turbine rotor

Abstract

The anti-deformation machining tool for the thin-journal steam turbine rotor comprises a thin-journal connecting sleeve, the thin-journal connecting sleeve is composed of three sections of sleeves, the three sections of sleeves comprise two or three sleeves with different diameters, one to two steps are formed in the sleeves, welding grooves are formed in the three sections of sleeves when the three sections of sleeves are welded, and the welding grooves are connected and fixed through electric welding; the external diameters of the sleeves are the same, and the connection structure of the adjacent sleeves is that the connection parts of the adjacent large-diameter cylindrical sleeves and small-diameter cylindrical sleeves are matched steps, so that a structure with different diameters of sleeves is formed; matched steps are arranged at the joints of the adjacent large-diameter cylinder sleeves and the secondary-diameter cylinder sleeves, steps with square corners matched with square concave parts are arranged at the joints of the secondary-diameter cylinder sleeves and the small-diameter cylinder sleeves, and the joints of the steps are welded and ground to be flat.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine rotor processing, in particular to an anti-deformation processing tool and a processing method for a thin-journal (super-long) steam turbine rotor. Background Art

[0002] As an important equipment in thermal power plants, steam turbines are closely related to the benefits of thermal power plants. The combination of all rotating parts in a steam turbine is called a rotor. As a core component, the rotor directly affects the efficient operation of steam turbine equipment. When the steam turbine rotor has a mass imbalance fault or deformation, the rotor will vibrate under the action of the unbalanced force. This fault will cause serious harm, increase the threat to the safety of steam turbine operation, and increase the cost of equipment inspection and maintenance.

[0003] The existing method uses a lathe chuck to clamp one end of the turbine rotor, and a center roller frame to support the end of the turbine rotor for processing. The size tolerance of the journal at both ends of the turbine rotor is required to be within 0.02mm, and the shape and position tolerance at both ends of the journal is required to be within 0.005mm, which is extremely demanding. When processing a thin-journal ultra-long turbine rotor (length over 3 meters), most of the weight of the rotor is concentrated in the middle of the rotor. This method is very likely to cause the rotor to deform during processing, resulting in the journal size and shape and position tolerance failing to meet the requirements of the drawing. In severe cases, the rotor is deformed and scrapped, causing unnecessary losses. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide an anti-deformation processing tooling for a thin-neck ultra-long steam turbine rotor, as well as an explanation of a processing method using the tooling. During the processing of the steam turbine rotor, a processing tooling is provided as a rotor connecting sleeve, and there is an interference fit relationship between the connecting sleeve and the rotor. The connecting sleeve is fixed to the shaft necks at both ends of the ultra-long steam turbine rotor and other slender positions by heat sleeve, thereby increasing the overall rigidity and anti-deformation of the ultra-slender steam turbine rotor. At this time, the accuracy of processing the thin-neck ultra-long steam turbine rotor is guaranteed.

[0005] The technical solution of the utility model is: an anti-deformation processing tool for a thin-neck steam turbine rotor, including a thin-neck connecting sleeve, the thin-neck connecting sleeve is composed of three-section sleeves, the three-section sleeves have two or three sleeves of different diameters, one or two steps are formed inside the sleeves, and welding grooves are provided when the three-section sleeves are welded, and the welding grooves are fixed by electric welding; the outer diameters of the sleeves are the same; the connection structure of adjacent sleeves is that the connection between adjacent large-diameter cylindrical sleeves and small-diameter cylindrical sleeves is a matching step, forming a structure with sleeves of different diameters; the connection between adjacent large-diameter cylindrical sleeves and secondary-diameter cylindrical sleeves is a matching step, and the connection between the secondary-diameter cylindrical sleeve and the small-diameter cylindrical sleeve is a step with a square corner and a square recess, and the step joint is welded and polished. If the other end (the second end) of the thin neck is also a thin neck, a second connecting sleeve 2 is also provided, and the second connecting sleeve 2 is also composed of three-section sleeves welded, and welding grooves are provided between each arc segment, and the welding grooves are fixed by electric welding;

[0006] Beneficial effects: The tooling of the utility model is applied to the processing of steam turbine rotors. An interference fit relationship is provided between the rotor connecting sleeve and the rotor. A step structure is provided in the connecting sleeve for tightly fixing the thin shaft neck. Different sleeves are welded to form the step-shaped sleeve of the present application. The processing is easy and the precision is easy to control. The tooling is fixed to the shaft necks at both ends of the super-long steam turbine rotor and other slender positions by heat sleeve, which increases the overall rigidity and anti-deformation of the super-slender steam turbine rotor, thereby ensuring that the belt clamp of the parts is precisely machined (especially the middle part of the machining shaft). Due to the reinforcement of the sleeve and the support of the middle roller, the machining of the shaft itself is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is the front view of the workpiece to be processed of the utility model;

[0008] Figure 2 It is an enlarged view of the utility model used for machining a journal. DETAILED DESCRIPTION

[0009] The names corresponding to the serial numbers in the figure are as follows: connecting sleeve 1, second connecting sleeve 2, rotor 3.

[0010] The connection structure of adjacent sleeves of the connecting sleeve 1 is as follows: the connection between the adjacent large diameter cylinder 1-1 and the (inner cylinder) secondary diameter cylinder 1-2 is a matching step, the connection between the secondary diameter cylinder 1-2 and the (inner cylinder) small diameter cylinder 1-3 is a (square corner and square concave) matching step 1-4, and the outer joint of the step is welded and ground flat. A structure of sleeves with different diameter steps is formed. The outer diameters of the large diameter cylinder 1-1, the secondary diameter cylinder 1-2 and the small diameter cylinder 1-3 are the same, which can be easily completed by turning, and the accuracy of clamping on the lathe is guaranteed.

[0011] The connecting sleeve 1 and the second connecting sleeve 2 (inner diameter) at the other end are tightly matched with the thin-neck ultra-long steam turbine rotor 3 (corresponding thin-neck position 3-1). Therefore, the connecting sleeve 1 and the second connecting sleeve 2 are fixed on the rotor 3 by shrink sleeve.

[0012] When the thin-journal rotor is processed to a 1mm margin, the tooling of the present application is installed. The inner diameter of the sleeve (cylinder) with the smallest diameter is 2mm larger than the diameter of the thin-journal support part of the rotor.

[0013] The specific processing method of the anti-deformation processing tooling for the thin-neck ultra-long steam turbine rotor is as follows:

[0014] 1. Rough turning of the turbine rotor, leaving 3mm machining allowance on one side (most of the allowance is left for the rotor journal and thinner parts);

[0015] 2. Perform stress relief heat treatment on the entire turbine rotor;

[0016] 3. Semi-finishing turning of turbine rotor, leaving 1mm machining allowance on one side (most of the allowance is reserved for rotor journal and thinner parts)

[0017] 4. Perform stress relief heat treatment on the steam turbine rotor as a whole again;

[0018] 5. Minimum polishing of the journals at both ends and the outer circle of the thinner parts;

[0019] 6. The journal and thinner parts are matched with the connecting sleeve 1 and the second connecting sleeve 2 according to the interference;

[0020] 7. Heat the connecting sleeve 1, and heat-fit the three sections onto the turbine rotor 3 from inside to outside in sequence;

[0021] 8. Heat the second connecting sleeve 2, and heat-fit the three sections onto the turbine rotor 3 from inside to outside in sequence;

[0022] 9. Finish turning the middle part of the turbine rotor (the outer circles of the connecting sleeve 1 and the second connecting sleeve 2 are polished to the minimum);

[0023] 10. Put on the center frame, hold the processed outer circle, turn the connecting sleeve 1, and finish turn the journal at one end;

[0024] 11. Put on the center frame, turn over, hold the processed outer circle, turn off the second connecting sleeve 2, and finish turn the shaft neck at the other end.

[0025] The above description is only an implementation case of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit, principles and theories of the present utility model are included in the protection scope of the present utility model.

Claims

1. Anti-deformation processing tooling for thin-journal steam turbine rotors, characterized in that: include: A thin shaft neck connecting sleeve, the thin shaft neck connecting sleeve is composed of three sections of sleeves, the three sections of sleeves have two or three sleeves of different diameters, one to two steps are formed inside the sleeves, and welding grooves are provided when the three sections of sleeves are welded, and the welding grooves are fixed by electric welding; the outer diameters of the sleeves are the same; the connection structure of adjacent sleeves is that the connection between adjacent large-diameter cylindrical sleeves and small-diameter cylindrical sleeves is a matching step, forming a structure of sleeves with different diameters; the connection between adjacent large-diameter cylindrical sleeves and secondary-diameter cylindrical sleeves is a matching step, and the connection between the secondary-diameter cylindrical sleeve and the small-diameter cylindrical sleeve is a step with matching square corners and square recesses, and the step joints are welded and polished.

2. The anti-deformation processing tool for a thin-journal steam turbine rotor according to claim 1, characterized in that: The inner diameter of the sleeve with the smallest diameter is 2 mm larger than the diameter of the rotor thin journal support portion.

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