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Processing method of five-fork blade-root moving blades with own shrouds

A processing method and technology of moving blades, applied in metal processing equipment, manufacturing tools, milling machine equipment details, etc., can solve the complex structure of the five-pronged blade root with its own crown, increased production costs, and the efficiency and dimensional accuracy cannot be achieved. Questions such as requirements

Active Publication Date: 2013-07-17
SICHUAN MIANZHU XINKUN MACHINERY MAKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The structure of the five-prong blade root is complex, and its blade root plays an important role in the steam turbine unit. Therefore, the precision of the blade itself, especially the blade root profile, is high. The existing process plan is: datum plane The processing is basically processed by ordinary flat milling and horizontal milling machine tools, and each process is processed in sequence, that is, each datum positioning plane is processed in sequence, and each datum plane needs a process to complete. The disadvantage of sequential processing is that it is easy to accumulate errors. The accumulative errors of multiple clamping and machining, the consistency of ordinary machine tools is not very good, the efficiency and dimensional accuracy are far from meeting the requirements, which inevitably has a great impact on product quality, and the product quality The consistency is poor, and it also greatly reduces the production efficiency, increases the product processing cycle, increases the number of machine tools required, and increases the production cost

Method used

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  • Processing method of five-fork blade-root moving blades with own shrouds
  • Processing method of five-fork blade-root moving blades with own shrouds

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1, the processing method of the five-fork blade root with crown moving blade of the present invention comprises the following steps:

[0033] Step 1, install the blade blank on the machine tool, use three tops to clamp the positioning reference of the blade, and add a clamping mechanism on both sides of the blade root, and add a floating support under the blade crown;

[0034] Step 2. Rough machining: For the machining of the blade root and blade crown, a milling cutter with a blade with a cutting angle radius of 0.4mm is selected, the rotation speed is 2200 rpm, the feed rate is 3500mm / min, and the cutting depth requirement is 1mm , Cutting width: 12-15mm; Among them, the processing of the steam channel profile adopts a bull-nose knife with a round blade with a cutting angle radius of 5mm, its speed is 2500 rpm, the feed rate is 3000 mm / min, and the cutting depth is 2 mm, and the cutting width is 8mm;

[0035] Step 3, semi-finishing: choose a blade milling ...

Embodiment 2

[0041] Embodiment 2 is similar to Embodiment 1, and mainly changes and controls various parameters affecting blade deformation during processing.

[0042] Step 1. Install the blade blank on the machine tool, use three tops to clamp the positioning reference of the blade, and add a clamping mechanism on both sides of the blade root, and add a floating support under the blade crown;

[0043] Step 2. Rough machining: For the machining of the blade root and blade crown, a milling cutter with a blade with a cutting angle radius of 0.4mm is selected, and its speed is 2000 rpm (can be selected from 2000-2200 rpm). The feeding speed is 3000mm / min (can be selected from 3000-3500mm / min), the cutting depth requirement is 0.8mm (can be selected from 0.8-1mm), and the cutting width can be 12mm (can be selected from 12-15mm); among them For the processing of the steam channel profile, a bull-nose knife with a round blade with a cutting corner radius of 5mm is selected, the speed is 2200 ...

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Abstract

The invention discloses a processing method of five-fork blade-root moving blades with own shrouds, belonging to the technical field of blade processing. The processing method comprises: step 1, clamping blades, step 2, roughing, step 3, semi-refining, step 4, refining, step 5, positioning a steam-out side of a shoulder of the blade root, a steam-out side of a shroud and a back radial surface of the blade root, selecting a cutter with cutting edges matching with five-fork blade root lines, with a rotating speed being 25-30 r / min, a feeding speed being 12.5 mm / min, a feed amount being 0.5-0.8 mm, and performing fine milling for the five-fork blade root lines of the blade along a linear direction. According characteristics of the five-fork blade-root moving blades with own shrouds, positioning reference surface during processing is unified, a one-time clamping is used to complete processing of each part, thereby effectively preventing accumulative errors, increasing processing precision, optimizing integration processing, shortening processing periods of products, reducing required amount of machine tool, and reducing production cost.

Description

technical field [0001] The invention relates to a steam turbine blade processing method, in particular to a processing method of a five-pronged blade root with a crowned blade, belonging to the technical field of steam turbine blade processing. Background technique [0002] The structure of the five-prong blade root is complex, and its blade root plays an important role in the steam turbine unit. Therefore, the precision of the blade itself, especially the blade root profile, is high. The existing process plan is: datum plane The processing is basically processed by ordinary flat milling and horizontal milling machine tools, and each process is processed in sequence, that is, each datum positioning plane is processed in sequence, and each datum plane needs a process to complete. The disadvantage of sequential processing is that it is easy to accumulate errors. The accumulative errors of multiple clamping and machining, the consistency of ordinary machine tools is not very go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23C3/18
Inventor 郑成旭谢泽波袁晓阳宁福贵罗兵肖鑫
Owner SICHUAN MIANZHU XINKUN MACHINERY MAKING
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