CN105563053A - Machining process for ultra-thin 3D integral impeller - Google Patents

Machining process for ultra-thin 3D integral impeller Download PDF

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Publication number
CN105563053A
CN105563053A CN201410618242.7A CN201410618242A CN105563053A CN 105563053 A CN105563053 A CN 105563053A CN 201410618242 A CN201410618242 A CN 201410618242A CN 105563053 A CN105563053 A CN 105563053A
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China
Prior art keywords
impeller
machining
benchmark
processing
centering
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CN201410618242.7A
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Chinese (zh)
Inventor
沈玉琢
富岩岩
刁全
裴忠科
彭宇
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沈阳鼓风机集团齿轮压缩机有限公司
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Priority to CN201410618242.7A priority Critical patent/CN105563053A/en
Publication of CN105563053A publication Critical patent/CN105563053A/en

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Abstract

The invention relates to a machining process for a compressor impeller, in particular to a machining process for an ultra-thin 3D integral impeller with ultra-thin blades. The machining process includes the steps of blank outer contour shape machining, numerically-controlled impeller milling machining and final outer contour machining, wherein when the blank outer contour shape machining is conducted, an alignment datum and a clamping datum are machined, a datum boss is machined on the upper side of a blank, and the outer circular face of the datum boss is the alignment datum; when the numerically-controlled impeller milling machining is carried out, precise machining tools for precise machining of the blades are conical, and the front ends of the precise machining tools are bulb-shaped; during precise machining of the blades, firstly, the precise machining tool with the front end bulb diameter being R4 is adopted for machining, and then the precise machining tool with the front end bulb diameter being R2 is adopted for precise machining of the whole blades. According to the machining process, machining efficiency is high, alignment time and machining time are greatly shortened, and the 3D integral impeller with high precision can be machined.

Description

Very thin overall 3 d impeller processing technology

Technical field

The present invention relates to the processing technology of compressor impeller, the very thin overall 3 d impeller processing technology that specifically a kind of blade is very thin.

Background technology

Impeller is also known as active wheel, it is unique element to air-flow work done in centrifugal compressor, also be epitrochanterian main parts, impeller is provided with blade, namely gas make High Rotation Speed with blade under the effect of impeller blade, and gas makes it be improved by the pressure of impeller by the effect of rotary centrifugal force and the flowing of the diffusion in impeller.The machining accuracy of 3 d impeller has vital impact to whole centrifugal compressor, and the machining accuracy improving 3 d impeller improves the important means of unit performance.In prior art, the processing method of monoblock type 3 d impeller mainly contains hot investment casting, numerical control cutting is processed, the methods such as Electrolyzed Processing, the processing of overall 3 d impeller have studied more than ten years at home, and have accumulated certain processing experience, but 0.6mm is only for blade thinnest part and the processing of the more very thin overall 3 d impeller of blade quantity, because blade is thinner and blade wheel structure complicated, if processing will be made very difficult according to overall 3 d impeller processing experience of the prior art, such as: 3 d impeller processing centering benchmark of the prior art is the impeller outlet outer circumference surface being positioned at impeller outlet place, centering inconvenience will be there will be according to the very thin overall 3 d impeller of this benchmark processing, the defects such as mismachining tolerance is large.

Summary of the invention

The object of the present invention is to provide the very thin overall 3 d impeller processing technology that a kind of blade is very thin, working (machining) efficiency is high, greatly saves centering and process time, and can process the higher very thin overall 3 d impeller of precision.

The object of the invention is to be achieved through the following technical solutions:

A kind of very thin overall 3 d impeller processing technology, comprises the processing of (one) blank outline shape, blank is processed into the outline shape of overall 3 d impeller, and processes centering benchmark and the benchmark that is installed; (2) impeller numerical control milling processing, first carries out roughing, processes blade and wheel hub by fine finishining again; (3) outline is finally processed.

In described step (), process a benchmark boss (1) on the upside of blank, the outer circumference surface of described benchmark boss (1) is centering benchmark.

The roughness of the outer circumference surface of described benchmark boss (1) is less than Ra3.2.

In described step (two), first processed the profile of blade and wheel hub by roughing.

In described step (two), for being taper to the accurately machined finishing tool of blade and front end is bulb shape.

The tapering of described finishing tool is 6 °.

During blade fine finishining, first adopt front end bulb diameter to be that the finishing tool of R4 is processed, then adopt front end bulb diameter to be the last processing that the finishing tool of R2 completes whole lamina.

In described step (two), workpiece is installed after centering according to centering benchmark and utilizes Five Axis lathe to complete processing.

In described step (three), after the centering that is installed by workpiece, according to described centering benchmark, the final processing that turnery processing completes 3 d impeller outline is carried out to the 3 d impeller after numerical control milling completes.

Advantage of the present invention and good effect are:

1, the present invention adds at blank outline shape and processes be installed benchmark and centering benchmark man-hour, on the upside of blank, wherein process a benchmark boss, the outer circumference surface of described benchmark boss is centering benchmark, and as the machining benchmark of all subsequent handlings, when making centering using described benchmark boss outer circumference surface as centering benchmark, eccentric angle is less, thus error is less, simultaneously according to the benchmark after improvement, operator's centering is convenient, reduces alignment time about a times.

2, the present invention is when impeller numerical control milling is processed, adopt the finishing tool of full cone angle shape, the taper design of the cone angle of described finishing tool is 6 °, front end bulb diameter is first adopted to be that the finishing tool 3 of R4 carries out the fine finishining of blade major part during the fine finishining of blade, then front end bulb diameter is adopted to be the fine finishining that the finishing tool 3 of R2 carries out whole lamina, remove remaining surplus, substantially increase working (machining) efficiency like this, and machining accuracy ensures to some extent.

Accompanying drawing explanation

Fig. 1 is blank outline shape schematic diagram of the present invention,

Fig. 2 is that the present invention's finishing tool used shows agreement,

Fig. 3 is impeller numerical control milling machining sketch chart of the present invention.

Wherein, 1 is benchmark boss, and 2 is impeller outlet outer circumference surface, and 3 is finishing tool.

Detailed description of the invention

Below in conjunction with accompanying drawing, the invention will be further described.

The whole process of method that the present invention processes very thin overall 3 d impeller is divided into: the processing of blank outline shape, impeller numerical control milling processing and outline are finally processed, and are specially:

(1) blank outline shape processing

After blank is heat-treated (comprising solutionizing and timeliness), first blank is processed into the outline shape of overall 3 d impeller, when processing outline shape, as shown in Figure 1, the centering benchmark of impeller and the benchmark that is installed need be processed, when wherein processing centering benchmark, a benchmark boss 1 need be processed on the upside of blank, the outer circumference surface roughness of described benchmark boss 1 is less than Ra3.2, and this outer circumference surface is centering benchmark of the present invention, is also the machining benchmark of all subsequent handlings.In the present embodiment, the length of described benchmark boss 1 on impeller height direction is 5mm.Centering benchmark of the prior art is the impeller outlet outer circumference surface 2 being positioned at impeller outlet place, and described impeller outlet outer circumference surface 2 can be used as the calibration reference of centering benchmark in the present invention.

The foundation of centering benchmark of the present invention, improves the centering precision of impeller greatly, effectively ensures the axiality of vane profile and centre bore, thus significantly improves the machining accuracy of impeller.Also such result can be derived theoretically:

tanθ=X/H

Wherein: θ is eccentric angle (degree °), and X is impeller blade radial height (mm), H: be impeller blade axial height (mm).

For any one impeller blade, its axial height is fixing, and eccentric angle is directly proportional to impeller blade radial height and changes, as long as therefore we ensure that eccentric angle is less, so impeller blade radial height deviation is less.Centering benchmark is defined as the outer circumference surface of described benchmark boss 1, when this transformation of criterion makes centering, eccentric angle is less, thus error is less, and simultaneously according to the benchmark after improving, operator's centering is convenient, reduces alignment time about a times.

(2) impeller numerical control milling processing

After blank shapes, workpiece to be installed centering make every runout error control within 0.01mm according to centering benchmark, then to utilize Five Axis lathe to carry out impeller numerical control milling processing according to numerical control program.

Impeller numerical control milling processing comprises roughing and fine finishining two parts, roughing adopts conventional machining mode, and the cutter utilizing diameter larger carries out roughing, removes most of surplus, process the profile of blade and wheel hub, then utilize finishing tool 3 to carry out fine finishining.The roughing surplus of the present embodiment is 2 ~ 3mm.

As shown in Figure 2, the design of the fine finishining milling cutter of 3 d impeller blade need consider the intensity that cutter will have, therefore Tool Design is tapered and front end is the finishing tool 3 of bulb shape, the taper design of described finishing tool 3 is 6 °, and length and the point diameter of described finishing tool 3 are determined according to actual needs.

Blade due to this kind of impeller is thin and blade quantity is many, first the fine finishining of blade adopt front end bulb diameter to be that finishing tool 3 pairs of blades of R4 are processed, surplus after the present embodiment adopts the finishing tool 3 of R4 to process is 0.5mm, then the machined parameters of Five Axis lathe is adjusted, and adopt front end bulb diameter to be the fine finishining that the finishing tool 3 of R2 carries out whole lamina, surplus is 0mm, completes blade processing.Because minor diameter finishing tool 3 cutting ability of R2 is poor, first adopt the finishing tool 3 of R4 to carry out fine finishining and can significantly improve working (machining) efficiency.After the blade processing of impeller terminates, adopt conventional knife to carry out the fine finishining of impeller hub, surplus is 0mm.After completing the fine finishining of impeller hub, the numerical control milling processing of 3 d impeller just all completes.

(3) outline is finally processed

After impeller numerical control milling machines, be next that the outline after very thin overall 3 d impeller numerical control mill is finally processed.Workpiece is played table by the cylindrical after impeller milling and runner end face and to be installed centering, every allowable error < 0.005mm that beats, and carry out turnery processing according to the 3 d impeller after numerical control milling completes by the centering benchmark on benchmark boss 1, complete the final processing of 3 d impeller outline, then after the heat treatment steps such as adjustment and timeliness, whole 3 d impeller process finishing.

Claims (9)

1. a very thin overall 3 d impeller processing technology, is characterized in that: comprise the processing of (one) blank outline shape, blank is processed into the outline shape of overall 3 d impeller, and processes centering benchmark and the benchmark that is installed; (2) impeller numerical control milling processing, first carries out roughing, processes blade and wheel hub by fine finishining again; (3) outline is finally processed.
2. very thin overall 3 d impeller processing technology according to claim 1, it is characterized in that: in described step (), on the upside of blank, process a benchmark boss (1), the outer circumference surface of described benchmark boss (1) is centering benchmark.
3. very thin overall 3 d impeller processing technology according to claim 2, is characterized in that: the roughness of the outer circumference surface of described benchmark boss (1) is less than Ra3.2.
4. very thin overall 3 d impeller processing technology according to claim 1, be is characterized in that: in described step (two), first processed the profile of blade and wheel hub by roughing.
5. very thin overall 3 d impeller processing technology according to claim 1, is characterized in that: in described step (two), for the accurately machined finishing tool of blade (3) for taper and front end is bulb shape.
6. very thin overall 3 d impeller processing technology according to claim 5, is characterized in that: the tapering of described finishing tool (3) is 6 °.
7. very thin overall 3 d impeller processing technology according to claim 5, it is characterized in that: during blade fine finishining, first adopt front end bulb diameter to be that the finishing tool (3) of R4 is processed, then adopt front end bulb diameter to be the last processing that the finishing tool (3) of R2 completes whole lamina.
8. very thin overall 3 d impeller processing technology according to claim 1, is characterized in that: in described step (two), and being installed by workpiece after centering according to centering benchmark utilizes Five Axis lathe to complete processing.
9. very thin overall 3 d impeller processing technology according to claim 1, it is characterized in that: in described step (three), workpiece is installed after centering, according to described centering benchmark, the final processing that turnery processing completes 3 d impeller outline is carried out to the 3 d impeller after numerical control milling completes.
CN201410618242.7A 2014-11-05 2014-11-05 Machining process for ultra-thin 3D integral impeller CN105563053A (en)

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Publication number Priority date Publication date Assignee Title
CN108637272A (en) * 2018-07-20 2018-10-12 江苏瑞尔隆盛叶轮科技有限公司 A kind of turning process of impeller
CN109759791A (en) * 2019-02-01 2019-05-17 黑龙江省机械科学研究院 Cavity thin-wall Centrifugal Impeller processing method in a kind of aerospace engine is accurate
CN110081024A (en) * 2019-03-25 2019-08-02 沈阳鼓风机集团股份有限公司 A kind of multistage centrifugal pump and its processing method

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108637272A (en) * 2018-07-20 2018-10-12 江苏瑞尔隆盛叶轮科技有限公司 A kind of turning process of impeller
CN109759791A (en) * 2019-02-01 2019-05-17 黑龙江省机械科学研究院 Cavity thin-wall Centrifugal Impeller processing method in a kind of aerospace engine is accurate
CN109759791B (en) * 2019-02-01 2020-01-07 黑龙江省机械科学研究院 Method for machining thin-wall integral centrifugal impeller with precise inner cavity of aerospace engine
CN110081024A (en) * 2019-03-25 2019-08-02 沈阳鼓风机集团股份有限公司 A kind of multistage centrifugal pump and its processing method

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