阅读说明：本技术 一种离心叶轮长寿命控制方法 (Long-life control method for centrifugal impeller ) 是由 胡冬生 方岚枫 王铁海 郭君伟 金汉� 刘金慧 戎漪婷 胡艳波 李政平 朱金刚 于 2021-09-03 设计创作，主要内容包括：本发明属于涡轴发动机压领域,具体为一种离心叶轮长寿命控制方法。提出根据循环寿命的影响程度,对离心叶轮关键区域进行分级界定,并通过关键区域0.2mm特种工艺控制、优化工艺过程控制和固化工艺,提高了产品合格率和质量稳定性。通过对离心叶轮加工工艺的改进,消除异形内腔、大端型面等关键区域的表面缺陷,优化了应力分布,改进抛光工艺方法、采用磨粒流加工技术,提高了叶轮关键区域围观表面质量,提高了抗疲劳性能,改进钛合金磨削方法,解决轴径端面和内孔磨削烧伤问题等。(The invention belongs to the field of turboshaft engine pressure, and particularly relates to a long-life control method for a centrifugal impeller. According to the influence degree of the cycle life, the key area of the centrifugal impeller is defined in a grading way, and the product percent of pass and the quality stability are improved through the control of a special process with the key area of 0.2mm, the control of the optimized process procedure and the curing process. By improving the processing technology of the centrifugal impeller, the surface defects of key areas such as a special-shaped inner cavity, a large-end molded surface and the like are eliminated, the stress distribution is optimized, the polishing technology method is improved, the abrasive flow processing technology is adopted, the quality of the surrounding surface of the key areas of the impeller is improved, the fatigue resistance is improved, the titanium alloy grinding method is improved, and the problem of shaft diameter end face and inner hole grinding burn is solved.)

1. A long-life control method for a centrifugal impeller is characterized by comprising the following steps:

(1) and assembling and processing single pieces of the centrifugal impeller: according to the requirements, the single centrifugal impeller is roughly machined to a specified size by a conventional method;

(2) and carrying out semi-finishing and finish machining on the single piece to form a special-shaped hole: according to the requirements, semi-finish machining is carried out on a single centrifugal impeller to a specified size by a conventional method, different areas of a special-shaped hole are processed by parameters, and the processing parameters and a cutter are solidified;

(3) and carrying out finish milling blade profile machining on the single piece: installing the single piece on equipment through a high-precision clamp, performing fine machining on the blade profile until the blade profile is qualified, distinguishing parameters of different areas, and curing a machining tool and machining parameters;

(4) polishing the single piece, and processing the abrasive flow: dividing a plurality of areas on a centrifugal impeller, respectively selecting different polishing methods for each area to process the area to a specified size, and then carrying out abrasive flow processing on the whole impeller to meet the requirement of surface roughness;

(5) and carrying out finish machining on the single piece: performing finish machining on the single piece to a specified size, and curing machining parameters and a cutter of a key area, wherein a formal piece can be machined after burn inspection on the test piece is qualified aiming at the position of grinding;

(6) and grinding the end teeth of the single piece: grinding the end teeth of the single piece to a specified size, and processing a formal piece after the burn inspection on the test piece is qualified before processing;

(7) and assembling: carrying out pressure assembly on the single centrifugal impeller;

(8) and processing the assembly: removing the allowance of the single piece to a specified size, and curing the processing parameters and the cutter of the key area, wherein a formal piece can be processed after the burn inspection on the test piece is qualified aiming at the position of the grinding processing;

(9) and balancing the components: carrying out dynamic balance on the centrifugal impeller assembly, and carrying out weight removal on the centrifugal impeller according to requirements until the dynamic balance meets the specified requirements;

(10) and final inspection: and (5) checking according to a drawing.

2. The method as claimed in claim 1, wherein the transmission of rough machining, radius machining, and finishing reference is strictly controlled.

3. The method as claimed in claim 1, wherein the polishing of the impeller is strictly performed according to fixed requirements, and the polishing of different regions takes different polishing forms.

4. The method for controlling the long life of a centrifugal impeller according to claim 1, wherein the abrasive flow processing parameters in (4) are strictly in accordance with the specification.

5. The method for controlling the long life of the centrifugal impeller according to claim 1, wherein UG modeling is adopted to machine the precision drive during the dynamic balance drive in (9).

6. The method for controlling the long service life of the centrifugal impeller according to claim 1, wherein the method is applied to an integral open type centrifugal impeller single piece.

7. The method for controlling the long life of a centrifugal impeller according to claim 1, wherein the solidifying in (3) is specifically a numerical control program list and an operation specification.

8. The method for controlling the long life of a centrifugal impeller as claimed in claim 1, wherein the roughness of the blades in the blade profile in (3) is Ra0.4 microns, and the roughness of the flow channels is Ra0.8 microns.

9. The method as claimed in claim 1, wherein the roughness of the profile of the outer flow channel and the major segment of the blade profile during the machining of the component (8) is less than Ra0.8 μm.

Technical Field

The invention belongs to the field of turboshaft engine pressure, and particularly relates to a long-life control method for a centrifugal impeller.

Background

The centrifugal impeller is a key part of a compressor of a medium and small-sized turboshaft engine and an APU compressor, and engines of various types researched by companies are applied. The centrifugal impeller machining is one of core technologies for manufacturing the gas compressor, has the requirements on long service life and working reliability, and is developed through years of experiments in factories, certain process knowledge is accumulated in all aspects, but the technical stability is not high, so that the part qualification rate is low, the surface quality is not high, repeated polishing and repair are needed, a large amount of labor and material cost is increased, and the service life of the part is severely limited.

Disclosure of Invention

The method for controlling the long service life of the centrifugal impeller is provided, the stability and the qualification rate of the centrifugal impeller processing are improved, and the manufacturing of the centrifugal impeller with long service life and high reliability is realized. A set of advanced process flow is developed, a plurality of advanced process methods are adopted, the technical index of the surface integrity of the impeller is controlled, the fatigue resistance of the impeller is improved, and relevant process specifications and operation specifications are formed.

Technical scheme

A long-life control method for a centrifugal impeller comprises the following steps:

(1) and assembling and processing single pieces of the centrifugal impeller: according to the requirements, the single centrifugal impeller is roughly machined to a specified size by a conventional method;

(2) and carrying out semi-finishing and finish machining on the single piece to form a special-shaped hole: according to the requirements, semi-finish machining is carried out on a single centrifugal impeller to a specified size by a conventional method, different areas of a special-shaped hole are processed by parameters, and the processing parameters and a cutter are solidified;

(3) and carrying out finish milling blade profile machining on the single piece: installing the single piece on equipment through a high-precision clamp, performing fine machining on the blade profile until the blade profile is qualified, distinguishing parameters of different areas, and curing a machining tool and machining parameters;

(4) polishing the single piece, and processing the abrasive flow: dividing a plurality of areas on a centrifugal impeller, respectively selecting different polishing methods for each area to process the area to a specified size, and then carrying out abrasive flow processing on the whole impeller to meet the requirement of surface roughness;

(5) and carrying out finish machining on the single piece: performing finish machining on the single piece to a specified size, and curing machining parameters and a cutter of a key area, wherein a formal piece can be machined after burn inspection on the test piece is qualified aiming at the position of grinding;

(6) and grinding the end teeth of the single piece: grinding the end teeth of the single piece to a specified size, and processing a formal piece after the burn inspection on the test piece is qualified before processing;

(7) and assembling: carrying out pressure assembly on the single centrifugal impeller;

(8) and processing the assembly: removing the allowance of the single piece to a specified size, and curing the processing parameters and the cutter of the key area, wherein a formal piece can be processed after the burn inspection on the test piece is qualified aiming at the position of the grinding processing;

(9) and balancing the components: carrying out dynamic balance on the centrifugal impeller assembly, and carrying out weight removal on the centrifugal impeller according to requirements until the dynamic balance meets the specified requirements;

(10) and final inspection: checking according to a drawing;

further, the transmission of rough machining, radius machining, and finishing references needs to be strictly controlled.

Further, impeller polishing needs to be strictly performed according to fixed requirements, and polishing in different areas adopts different polishing forms.

Further, in (4), the abrasive flow processing parameters strictly meet the requirements of the execution parameters according to the specification.

Further, (9) during dynamic balance driving, UG modeling machining precision driving is adopted.

Further, the method is applicable to the single piece of the integral open centrifugal impeller.

Further, the solidification in the point (3) is specifically numerical control program list and operation specification.

Further, (3) the roughness of the blade in the blade profile is Ra0.4 microns, and the roughness of the flow channel is Ra0.8 microns.

Further, (8) the roughness of the outer flow passage and the large section profile of the blade profile during the processing of the component is less than Ra0.8 microns.

Technical effects

The invention provides a long-life control method for a centrifugal impeller, which is characterized in that a key area of the centrifugal impeller is defined in a grading manner according to the influence degree of the cycle life, and the qualification rate and the quality stability of products are improved through special process control, optimized process control and solidification processes of 0.2mm in the key area.

Detailed Description

By improving the processing technology of the centrifugal impeller, the surface defects of key areas such as a special-shaped inner cavity, a large-end molded surface and the like are eliminated, the stress distribution is optimized, the polishing technology method is improved, the abrasive flow processing technology is adopted, the quality of the surrounding surface of the key areas of the impeller is improved, the fatigue resistance is improved, the titanium alloy grinding method is improved, and the problem of shaft diameter end face and inner hole grinding burn is solved.

The centrifugal impeller is wind wheel equipment which supplies air in the axial direction and discharges air in the radial direction, and applies work by utilizing centrifugal force (depending on rotating speed and outer diameter) to improve pressure of air. The centrifugal fan impeller can be divided into a forward-inclined wind wheel, a radial wind wheel and a backward-inclined wind wheel according to the angle of the blade, and the impeller can be divided into a multi-wing impeller and a divided wheel according to the structure of the impeller.

The method specifically comprises the following steps:

(1) and assembling and processing single pieces of the centrifugal impeller: according to the requirements, the single centrifugal impeller is roughly machined to a specified size by a conventional method;

(2) and carrying out semi-finishing and finish machining on the single piece to form a special-shaped hole: according to the requirements, semi-finish machining is carried out on a single centrifugal impeller to a specified size by a conventional method, different areas of a special-shaped hole are processed by parameters, and the processing parameters and a cutter are solidified;

(3) and carrying out finish milling blade profile machining on the single piece: installing the single piece on equipment through a high-precision clamp, performing fine machining on the blade profile until the blade profile is qualified, distinguishing parameters of different areas, and curing a machining tool and machining parameters;

(4) polishing the single piece, and processing the abrasive flow: dividing a plurality of areas on a centrifugal impeller, respectively selecting different polishing methods for each area to process the area to a specified size, and then carrying out abrasive flow processing on the whole impeller to meet the requirement of surface roughness;

(5) and carrying out finish machining on the single piece: performing finish machining on the single piece to a specified size, and curing machining parameters and a cutter of a key area, wherein a formal piece can be machined after burn inspection on the test piece is qualified aiming at the position of grinding;

(6) and grinding the end teeth of the single piece: grinding the end teeth of the single piece to a specified size, and processing a formal piece after the burn inspection on the test piece is qualified before processing;

(7) and assembling: carrying out pressure assembly on the single centrifugal impeller;

(8) and processing the assembly: removing the allowance of the single piece to a specified size, and curing the processing parameters and the cutter of the key area, wherein a formal piece can be processed after the burn inspection on the test piece is qualified aiming at the position of the grinding processing;

(9) and balancing the components: carrying out dynamic balance on the centrifugal impeller assembly, and carrying out weight removal on the centrifugal impeller according to requirements until the dynamic balance meets the specified requirements;

(10) and final inspection: checking according to a drawing;

further, the transmission of rough machining, radius machining, and finishing references needs to be strictly controlled.

Further, impeller polishing needs to be strictly performed according to fixed requirements, and polishing in different areas adopts different polishing forms.

Further, in (4), the abrasive flow processing parameters strictly meet the requirements of the execution parameters according to the specification.

Further, (9) during dynamic balance driving, UG modeling machining accurate driving is adopted, and manual operation risks are avoided.

Further, the method is applicable to the single piece of the integral open centrifugal impeller. If the impeller is a split centrifugal impeller, other control methods are adopted for corresponding design.

Further, the solidification in the point (3) is specifically numerical control program list and operation specification.

Further, (3) the roughness of the blade in the blade profile is Ra0.4 microns, and the roughness of the flow channel is Ra0.8 microns.

Further, (8) the roughness of the outer flow passage and the large section profile of the blade profile during the processing of the component is less than Ra0.8 microns. The precision is ensured.

Examples

The first-stage centrifugal impeller machining method of a certain large helicopter engine comprises the following implementation processes:

(1) and assembling and processing single pieces of the centrifugal impeller: according to the requirements, the single centrifugal impeller is roughly machined to a specified size by a conventional method;

(2) and carrying out semi-finishing and finish machining on the single piece to form a special-shaped hole: according to the requirements, semi-finish machining is carried out on a single centrifugal impeller to a specified size by a conventional method, different areas of a special-shaped hole are processed by parameters, and the processing parameters and a cutter are solidified;

(3) and carrying out finish milling blade profile machining on the single piece: installing the single piece on equipment through a high-precision clamp, performing fine machining on the blade profile until the blade profile is qualified, distinguishing parameters of different areas, and curing a machining tool and machining parameters;

(4) polishing the single piece, and processing the abrasive flow: dividing a plurality of areas on a centrifugal impeller, respectively selecting different polishing methods for each area to process the area to a specified size, and then carrying out abrasive flow processing on the whole impeller to meet the requirement of surface roughness;

(5) and carrying out finish machining on the single piece: performing finish machining on the single piece to a specified size, and curing machining parameters and a cutter of a key area, wherein a formal piece can be machined after burn inspection on the test piece is qualified aiming at the position of grinding;

(6) and grinding the end teeth of the single piece: grinding the end teeth of the single piece to a specified size, and processing a formal piece after the burn inspection on the test piece is qualified before processing;

(7) and assembling: carrying out pressure assembly on the single centrifugal impeller;

(8) and processing the assembly: removing the allowance of the single piece to a specified size, and curing the processing parameters and the cutter of the key area, wherein a formal piece can be processed after the burn inspection on the test piece is qualified aiming at the position of the grinding processing;

(9) and balancing the components: carrying out dynamic balance on the centrifugal impeller assembly, and carrying out weight removal on the centrifugal impeller according to requirements until the dynamic balance meets the specified requirements;

(10) and final inspection: and (5) inspecting according to a drawing, and conforming to the drawing requirement and being qualified.