CN110102989B

CN110102989B - Processing method of compressed air impeller of VTR series supercharger

Info

Publication number: CN110102989B
Application number: CN201910475317.3A
Authority: CN
Inventors: 周德贵; 段昌文; 柯益; 刘国成; 林英
Original assignee: Chongqing Jiangjin Shipbuilding Industry Co Ltd
Current assignee: Chongqing Jiangjin Shipbuilding Industry Co Ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2021-12-10
Anticipated expiration: 2039-06-03
Also published as: CN110102989A

Abstract

The invention provides a processing method of a compressed air impeller of a VTR series supercharger, which comprises the following steps: a. turning an axial inner hole in the center of the impeller; b. heat treatment; c. turning the end face and the outer circle of the impeller; d. turning the small end of the impeller and an axial inner hole of the impeller, and simultaneously taking a sample ring on the impeller; e. checking; f. roughly turning the small end of the impeller; g. semi-finish turning the large end and the small end of the impeller, the meridian plane of the impeller and the axial inner hole of the impeller; h. milling a blade and a flow passage; i. finely turning the outer circle of the large end of the impeller; j. finely turning the large end of the impeller and an axial inner hole of the impeller; k. clamping and positioning the impeller on a turning tool, and finely turning an impeller positioning surface used in the next procedure; finely turning the large end of the impeller and an axial inner hole of the impeller; m, finely turning the end surface of the small end of the impeller; and n, finely turning the meridian plane and the end face of the blade of the impeller. The method improves the matching precision and the sealing property between the large end face of the impeller and the gas sealing sheet, and solves the problem that the performance condition of the part after heat treatment cannot be truly reflected by the sample ring after the original sample ring and the impeller are subjected to split heat treatment.

Description

Processing method of compressed air impeller of VTR series supercharger

Technical Field

The invention relates to the technical field of manufacturing and processing of engines of ships, in particular to a processing method of a compressed air impeller of a VTR series supercharger.

Background

At present, with the change of international situation, the ship manufacturing industry in China develops rapidly, and the market share keeps the leading position of the world. The main power device of the ship is a diesel engine, the supercharger is used as an important part of the diesel engine, and the technical level of the supercharger directly influences the working efficiency of the marine diesel engine.

The compressed air impeller is used as a core component of a VTR series supercharger product, a key part, as shown in figure 1, is arranged at the left end of a rotor and rotates at high speed along with a rotor sleeve when in work, and the part has higher required assembly and matching with surrounding parts, especially has strict matching and gas sealing between a large end plane and an air sealing sheet so as to meet the work requirement of high-speed operation of a machine, and the large end plane of the part has higher dimensional precision and form and position precision, especially has the end face jumping requirement, otherwise the large end plane of the part can rub and damage the matching part when in work, and even can damage the rotor sleeve to cause accidents;

1. the big terminal surface of part is before processing, need carry out clamping alignment facing runout within 0.03mm, because the clamping locating surface is uneven, big terminal surface and locating surface nonparallel etc, the part can not reach the alignment requirement under natural state clamping, lead to the operator to strike the part by force, high point step-down on the part when will aligning, the low point becomes high, in order to reach required terminal surface alignment value 0.03mm, thereby form the clamping internal stress, end face machining accomplishes, remove the external force clamping, the part resumes under the natural state, size and shape position precision on the terminal surface will take place great change, can not reach the drawing design requirement.

2. During heat treatment, the parts and the sample ring are separately processed, the area difference exists during heat treatment in a furnace, the heating speed, the heating time, the cooling time and the like are not completely the same, the sample ring cannot completely and truly reflect the heat treatment condition of the parts, and the heat treatment requirement of the parts cannot be really guaranteed.

3. The sampling quantity of the sample ring is only 1 piece per batch, and the quality control requirement and the inspection specification are not met.

4. The parts are processed in an external cooperation mode, the cost is high, the production progress cannot be controlled, and the time required by customers cannot be met.

5. No successful processing experience is available for reference.

Disclosure of Invention

The invention provides a processing method of a compressed air impeller of a VTR series supercharger, aiming at the technical problems that the size precision and the form and position precision of the processed large end surface of the impeller can not meet the design requirement, the mechanical performance of the processed impeller can not meet the standard and specification requirements and the like.

The technical scheme of the invention is as follows:

a processing method of a compression impeller of a VTR series supercharger comprises the following steps:

a. drilling an axial inner hole in the center of the impeller;

b. heat treatment;

c. turning the end face and the excircle of the impeller after roughly aligning the excircle and the end face;

d. turning the small end of the impeller and the axial inner hole of the impeller after roughly aligning the excircle and the end face, and simultaneously taking a sample ring on the impeller;

clamping an excircle by using three claws, turning the end face of the small end of the impeller and an axial inner hole of the impeller, and simultaneously taking a sample ring on the upper part of the small end of the impeller, wherein the sample ring is obtained by heat treatment in the same furnace and in the same body with the impeller;

e. taking the sample ring as an impeller sample piece to detect mechanical performance and ultrasonic flaw detection;

f. roughly turning the small end of the impeller by abutting against the end face of the large end of the flat impeller;

clamping the outer circle by using three claws, and roughly turning the end face and the circumferential surface of the small end of the impeller;

g. semi-finish turning the large end and the small end of the impeller, the meridian plane of the impeller and the axial inner hole of the impeller;

g1. clamping an excircle by using a soft three-jaw clamp, and semi-finish turning the end surface of the large end of the impeller, the back cambered surface and an axial inner hole of the impeller;

g2. clamping an excircle by using a soft three-jaw clamp, semi-finish turning a small end face, a circumferential face, an annular groove, an impeller meridian plane, an impeller axial inner hole and a small end inner hole chamfer, and reserving finish turning allowance on the meridian plane;

g3. clamping the impeller on a vehicle mandrel, and semi-finish turning the circumferential surface of the large end of the impeller and a clamping step;

h. clamping and positioning the semi-finished impeller on a milling tool, and milling blades and a flow channel; i. clamping the semi-finished impeller on a turning mandrel, and finely turning the outer circle of the large end of the impeller;

i. clamping the semi-finished impeller on a turning mandrel, and finely turning the outer circle of the large end of the impeller;

j. aligning a gas seal surface, aligning an axial inner hole of the impeller, and finely turning the large end of the impeller and the axial inner hole of the impeller;

k. the impeller is clamped on a special turning tool by taking the large end face of the impeller as a reference and leaning against a flat end face, the turning tool comprises a base and a clamping block arranged at one end of the base, a stepped hole fixedly connected with a machine tool chuck is vertically arranged on the base, the turning tool is fixedly connected with the machine tool chuck through the stepped hole by a screw, an inner arc surface for clamping the large excircle of the impeller is arranged on one side of the clamping block facing the base, the turning tools are uniformly distributed on the machine tool chuck, move along the machine tool chuck in the radial direction to clamp the impeller, and an impeller positioning surface used in the next procedure is finely turned;

taking the impeller positioning surface processed in the step k as a reference, aligning an axial inner hole of the impeller by abutting against a flat end surface, and finely turning the large end of the impeller and the axial inner hole of the impeller;

m, aligning an axial inner hole of the impeller and the end face of the large end of the impeller, and finish turning the end face of the small end of the impeller according to the requirements of a drawing;

n, finely turning a meridian plane and a blade end face of the impeller;

and further, the procedures of milling the blades and the flow channels in the step h are divided into rough milling and finish milling.

Furthermore, in the step j, clamping the outer circle of the large end by using the soft three-jaw clamp, aligning the gas seal surface, aligning the axial inner hole of the impeller, and finely turning the end surface, the back cambered surface and the axial inner hole of the impeller of the large end of the impeller.

And step l, lightly clamping a large outer circle by using soft three claws, leaning on a flat impeller positioning surface, and finely turning the large end surface, the back cambered surface, the air seal surface and the axial inner hole of the impeller.

Further, the sampling quantity of the sample ring is determined according to the standard specification according to the processing quantity of the impellers of each batch.

Further, a first part deburring, a first impeller single-piece dynamic balance test and an overspeed test are further included between the steps j and k, and a second part deburring and a second impeller single-piece dynamic balance test are further included after the step n.

The invention has the beneficial effects that:

1. and (3) before finish turning of the large end face in the step (l), adding a finish turning procedure of the step (k) to perform reliable plane positioning on the large end face, finish turning an impeller positioning plane used in the step (processing the large end face), ensuring the flatness of the impeller positioning plane used in the step (l) and the parallelism of the large end face, and ensuring that a clamping positioning plane is parallel to the large end face, so that the part is clamped in a natural state, the alignment requirement of 0.03mm is met, and the generation of clamping internal stress is avoided.

2. And (c) during finish machining in the step k, designing and using a special turning tool required by a common lathe, solving the problems of inconvenience in clamping, instability and unreliability in positioning of a common chuck, realizing indirect measurement of the machining size of the process, providing a reliable positioning surface for the subsequent process, meeting the requirement of being parallel to the alignment surface, and providing reliable guarantee for smooth implementation of the subsequent process.

3. According to the invention, the part is subjected to heat treatment in the step b, then the sample ring is taken during turning in the step d, the sample ring and the part are in the same body and are subjected to heat treatment in the same furnace, so that the authenticity and the identity of the sample ring and the part are realized, the heat treatment condition of the part can be completely and truly reflected by detecting the mechanical property and performing ultrasonic flaw detection on the sample ring, and the problems that the sample ring and the part are subjected to split heat treatment firstly and then the heat treatment of the part in the original process, and the performance condition of the part after the heat treatment cannot be completely and truly reflected by the sample ring are effectively solved.

4. The sampling number of the heat treatment sample rings is adjusted, and the sampling number is determined according to the standard specification according to the number of the processed impellers of each batch, so that the defect that only 1 sample ring is taken for detection in each batch of processing in the prior art is overcome, and the quality control specification requirement and the quality standard are met.

5. A set of reliable and stable processing method is provided for processing VTR series air compression impellers, and reference basis and reference are provided.

Drawings

FIG. 1 is an assembly view of a prior art compressor impeller;

FIG. 2 is a schematic view of a compressor impeller;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a drawing of the turning process of step c;

FIG. 5 is a drawing of the turning process of step d;

FIG. 6 is a drawing of the rough turning process of step f;

FIG. 7 is a drawing of a semi-finish turning process of step g 1;

FIG. 8 is a drawing of a semi-finish turning process of step g 2;

FIG. 9 is a drawing of a semi-finish turning process of step g 3;

FIG. 10 shows a schematic diagram of a milling process of step h;

FIG. 11 is a drawing of the finish turning process of step j;

FIG. 12 is a drawing of step k in the finish turning process;

FIG. 13 is a drawing of a finish turning process of step l;

FIG. 14 is a drawing of a finish turning process of step n;

FIG. 15 is a front view of the turning tool clamping the positioning impeller;

FIG. 16 is a view taken along line A of FIG. 15;

in the drawings: 1-an impeller; 101-large end of impeller; 102-impeller small end; 103-axial inner bore; 104-meridian plane; 105-dorsal camber; 106-blade; 107-impeller positioning surface; 108-blade end face; 109-an annular groove; 110-a clamping step; 111-gas cover; 2-sample loop; 3-turning a tool; 301-a base; 302-a clamping block; 3011-a stepped hole; 3021-inner arc surface; 4-machine tool chuck.

Detailed Description

Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

As shown in fig. 15 and 16, a turning tool for a VTR series supercharger compressor impeller comprises a base 301 and a clamping block 302 arranged at one end of the base, wherein a stepped hole 3011 fixedly connected with a machine tool chuck 4 is vertically arranged on the base 301, a turning tool 3 is tightly connected with the machine tool chuck 4 through the stepped hole by a screw, an inner arc surface 3021 for clamping a large outer circle of the impeller is arranged on one side of the clamping block 302 facing the base 301, and the turning tools 3 are uniformly distributed on the machine tool chuck and move along the radial direction of the machine tool chuck 4 to clamp the impeller 1.

As shown in fig. 4 to 14, a VTR series supercharger compressor impeller processing method includes the following steps:

a. drilling axial inner hole 103 to

b. Heat treatment;

c. clamping the outer circle by using three claws, roughly aligning the outer circle and the end face, and turning the end face and the outer circle of the impeller;

d. clamping the outer circle by using three claws, roughly aligning the outer circle and the end face, turning the end face of the small end 102 of the impeller and an axial inner hole 103 of the impeller, and simultaneously taking a sample ring 2 from the upper part of the small end of the impeller, wherein the sample ring is obtained by heat treatment in the same furnace with the impeller in the step b and turning;

e. the sample ring is used as an impeller sample piece for detecting mechanical performance and ultrasonic flaw detection, and because the sample ring and the impeller are in the same body and are subjected to heat treatment in the same furnace, the performance condition of the impeller after heat treatment can be completely and truly reflected;

f. clamping the outer circle by using three claws, and roughly turning the end surface of a small end 102 and the circumferential surface of the impeller by leaning against the end surface of a large end 101 of the flat impeller;

g. semi-finish turning an impeller large end 101, an impeller small end 102, an impeller meridian plane 104 and an impeller axial inner hole 103; in the embodiment, step g includes three steps, as shown in fig. 7, g1. uses a soft three-jaw clamp to clamp the outer circle, and semi-finish turning the end surface of the large end 101 of the impeller, the back arc surface 105 and the axial inner hole 103 of the impeller; as shown in fig. 8, g2. uses soft three-jaw clamp to clamp the excircle, semi-finish turning the end face and the circumferential face of the small end 102 of the impeller, the annular groove 109, the meridian plane 104 of the impeller, the axial inner hole 103 of the impeller and the chamfer of the inner hole of the small end, the meridian plane 104 reserves finish turning allowance of 1 mm; g3. clamping the impeller 1 on a vehicle mandrel, semi-finish turning the circumferential surface of the large end 101 of the impeller and a 45-degree clamping step 110 as shown in FIG. 9;

h. clamping and positioning the semi-finished impeller product on a milling tool, milling a blade 106 and a flow channel, wherein the milling tool adopts an issued patent of a company, namely a compressed air impeller universal milling tool (CN205733965U) for positioning and clamping the impeller; the blade milling and runner milling procedures are divided into rough milling and finish milling, the control is carried out through a numerical control program, and the milled first piece is sent to three-coordinate detection.

i. Will be provided withThe semi-finished impeller is clamped on a vehicle mandrel, and the excircle of the large end 101 of the impeller is finely turned to

j. Clamping a large excircle by using a soft three-jaw clamp, aligning a gas seal surface 111, aligning an impeller axial inner hole 103, aligning a runout of the impeller axial inner hole 103, and finish turning the end surface of a large end 101 of the impeller, a back cambered surface 105 and the impeller axial inner hole 103, wherein the runout is not more than 0.03 mm;

k. clamping the impeller on a turning tool according to claim 1 by using a flat end surface (the impeller cannot be plugged by using a feeler gauge of 0.02 mm) by taking the end surface of a large end 101 of the impeller as a reference, and finely turning an impeller positioning surface 107 used in a next process; on a common lathe, a special turning tool is designed and used, a clamping positioning surface for a subsequent process is turned flat and is parallel to the large end surface of the impeller, and safe and reliable guarantee is provided for smooth processing of a next process;

the large outer circle is lightly clamped by using soft three claws, the impeller positioning surface 107 processed in the process k is taken as a reference, the runout is not more than 0.03mm by means of a flat impeller positioning surface (only whether the impeller is assembled and the positioning surface is well attached and the impeller is not beaten to align the end face runout), the axial inner hole 103 of the impeller is aligned, the runout is not more than 0.01mm, and the end face of the large end 101 of the impeller, the back cambered surface 105, the air seal surface 111 and the axial inner hole 103 of the impeller are finely turned; the radial circular run-out of the gas cover is 0.045 mm; during clamping, a leveling part does not need to be knocked positively, so that the generation of clamping internal stress is avoided, and therefore, after the large end face is finish turned, the deformation is avoided, the drawing and design requirements can be smoothly met, and the dimensional accuracy and the form and position accuracy of the large end face of the impeller are improved;

m, clamping an excircle by using a soft three-jaw clamp, aligning an axial inner hole 103 of an impeller and the end surface of a large end 101 of the impeller, and finely turning the end surface of a small end 102 of the impeller to 67mm according to the drawing requirements;

n, finely turning an impeller meridian plane 104 and a blade end face 108;

in this embodiment, in step d, the sampling number of the sample rings is determined according to the standard specification according to the number of processed parts of each batch of impellers, and the specification requirement is that the processed number of each batch of parts is less than (including) 10, 2 sample rings in total are respectively taken from 2 parts, the processed number of the parts is greater than 11 to 50, 4 sample rings in total are respectively taken from 4 parts, the processed number of the parts is greater than 51, 6 sample rings in total are respectively taken from 6 parts, and the quality control standard and the specification requirement can be met.

In this embodiment, a first part burr cleaning, a first impeller single-piece dynamic balance test and an overspeed test are further included between steps j and k, and a second part burr cleaning and a second impeller single-piece dynamic balance test are further included after step n.

As shown in fig. 15 and 16, when the turning tool is used, six hexagon socket head cap screws are connected to a chuck of a machine tool, an inner arc surface on a clamping block clamps a large outer circle of an impeller, 3 inner square holes on the chuck of the machine tool are pulled, so that the turning tool moves along the radial direction of the chuck to clamp the impeller.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.

Claims

1. A processing method of a compression impeller of a VTR series supercharger is characterized by comprising the following steps:

a. drilling an axial inner hole in the center of the impeller;

b. heat treatment;

g. semi-finish turning the large end, the small end, the meridian plane and the axial inner hole of the impeller,

h. clamping and positioning the semi-finished impeller on a milling tool, and milling blades and a flow channel;

k. the method comprises the following steps that the large end face of an impeller is taken as a reference, the impeller is clamped and positioned on a special turning tool by means of a flat end face, the turning tool comprises a base and a clamping block arranged at one end of the base, a stepped hole fixedly connected with a machine tool chuck is vertically arranged on the base, the turning tool is fixedly connected with the machine tool chuck through the stepped hole by a screw, an inner arc surface used for clamping the large excircle of the impeller is arranged on one side, facing the base, of the clamping block, the turning tools are uniformly distributed on the machine tool chuck, the turning tools move along the radial direction of the machine tool chuck to clamp the impeller, and an impeller positioning surface used in the next procedure is finely turned;

m, aligning an axial inner hole and a large end face of the impeller, and finish turning the small end face of the impeller according to the requirements of a drawing;

and n, finely turning the meridian plane and the end face of the blade of the impeller.

2. The method for machining a compressor impeller of a VTR series supercharger according to claim 1, characterized in that: and h, the procedures of blade milling and runner milling are divided into rough milling and finish milling.

3. The method for machining a compressor impeller of a VTR series supercharger according to claim 1, characterized in that: and j, clamping the outer circle of the large end by using a soft three-jaw clamp, aligning a gas seal surface, aligning an axial inner hole of the impeller, and finely turning the end surface of the large end of the impeller, the back cambered surface and the axial inner hole of the impeller.

4. The method for machining a compressor impeller of a VTR series supercharger according to claim 1, characterized in that: and step l, lightly clamping the large excircle by using soft three claws, leaning against a flat impeller positioning surface, and finely turning the large end surface, the back cambered surface, the air seal surface and the axial inner hole of the impeller.

5. The method for machining a compressor impeller of a VTR series supercharger according to claim 1, characterized in that: and the sampling quantity of the sample ring is determined according to the standard specification according to the processing quantity of the impellers of each batch.

6. The method for machining a compressor impeller of a VTR series supercharger according to claim 1, characterized in that: and (c) further comprising a first part burr cleaning, a first impeller single-piece dynamic balance test and an overspeed test between the steps j and k, and further comprising a second part burr cleaning and a second impeller single-piece dynamic balance test after the step n.