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Method for machining concave surface between rotor impellers of steam turbine

A steam turbine rotor and processing method technology, applied in metal processing equipment, manufacturing tools, turning equipment, etc., can solve the problems of low processing accuracy and efficiency, small impeller clearance, etc., and achieve the effect of improving processing accuracy and processing efficiency

Active Publication Date: 2012-02-01
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low machining accuracy and efficiency due to the small gap between two adjacent impellers, the present invention further provides a method for machining concave surfaces between impellers of steam turbine rotors

Method used

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  • Method for machining concave surface between rotor impellers of steam turbine
  • Method for machining concave surface between rotor impellers of steam turbine

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0012] Specific implementation mode one: as figure 1 As shown, the steps of the method for processing the concave surface between the rotor blades of the steam turbine in the present embodiment are as follows:

[0013] Step 1, install the cutting tool: install the knife bank 9 on the CNC machine tool, and install the first tool on the knife bank 9;

[0014] Step 2, tool setting: set the tool outside the rotor impeller, then remove the first tool from the knife bank 9, insert the knife bank 9 between the two-stage impellers, and install the first tool on the knife bank 9;

[0015] Step 3. Carry out concave turning between the two-stage impellers by programming the CNC machine tool, control the speed of the rotor impeller to 30-50 rpm, and the feed rate of the cutter for one revolution of the rotor impeller is 0.1-0.3 mm;

[0016] Step 4. Tool change processing: After the first tool finishes processing, replace the second tool, the third tool to the eighth tool in sequence, rep...

specific Embodiment approach 2

[0017] Embodiment 2: In step 3, the rotational speed of the rotor impeller is 40 rpm. In this way, the rotor impeller rotates at a low speed, and the machining accuracy is high. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Embodiment 3: In step 3, the feed rate of the cutter is 0.2 mm for one revolution of the rotor impeller. In this way, the machining accuracy is high. Others are the same as in the first embodiment.

[0019] working principle:

[0020] Due to the narrow distance between the two impellers of the impeller rotor, the concave surface (ie figure 1 The middle shaded part) controls the movement distance of the knife row 9 along the axial direction, and the same tool cannot be used to complete the machining. processing figure 1 The length of the longest cutter required for the middle shaded part is B. When the right end face of the blade row 9 is close to the end face of the impeller, the distance between the left end face of the blade row and the end face of the adjacent first-stage impeller is A. If A is greater than B, the distance between the blade row 9 The width of the upper cutter can be extended from between the two-stage impellers, and the shadow part can be process...

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Abstract

The invention discloses a method for machining a concave surface between rotor impellers of a steam turbine, relating to methods for machining concave surfaces, which is used for solving the problem that the machining accuracy and the machining efficiency are low because the clearance between two adjacent impellers is small. The method comprises the following steps: (1) mounting a cutter row on anumerically-controlled machine, and mounting a first cutter on the cutter row; (2) aligning the cutter with the outer sides of the rotor impellers, detaching the first cutter from the cutter row, inserting the cutter row between the two-stage impellers, and mounting the first cutter on the cutter row; (3) carrying out a turning operation on the concave surface between the two-stage impellers through programming the numerically-controlled machine; and (4) sequentially replacing a second cutter, a third cutter to a eighth cutter after the first cutter finishes machining, and repeating the (1) to the (2), gradually machining the concave surface between the two-stage impellers, and finally finishing allowance-machining between the impellers so as to form a final molded line for the concave surface between the two-stage impellers, wherein the length of the second cutter to the eighth cutter sequentially and gradually increases from short to long. The method disclosed by the invention is used for machining concave surfaces between rotor impellers of steam turbines.

Description

technical field [0001] The invention relates to a method for processing concave surfaces between impellers of steam turbine rotors. Background technique [0002] The steam turbine rotor is the core component of the steam turbine and requires high machining accuracy. The impellers of low-pressure rotors of high-power steam turbines are generally processed into large concave surfaces. Due to the small gap between two adjacent impellers, it is difficult to process the concave surfaces between impellers, resulting in low machining accuracy and efficiency. Contents of the invention [0003] In order to solve the problem that the gap between two adjacent impellers is small, resulting in low machining accuracy and efficiency, the invention further provides a method for machining the concave surface between the rotor impellers of a steam turbine. [0004] The concave surface machining method between the machining steam turbine rotor blades of the present invention is realized acc...

Claims

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Application Information

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IPC IPC(8): B23B1/00B23B27/00
Inventor 孙治丰太秀滨姚青文张俊成车利民项胜新储继影
Owner HARBIN TURBINE