CN110153650B - Method for processing saddle groove blade seat of large axial flow compressor - Google Patents
Method for processing saddle groove blade seat of large axial flow compressor Download PDFInfo
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- CN110153650B CN110153650B CN201910363851.5A CN201910363851A CN110153650B CN 110153650 B CN110153650 B CN 110153650B CN 201910363851 A CN201910363851 A CN 201910363851A CN 110153650 B CN110153650 B CN 110153650B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/321—Rotors specially for elastic fluids for axial flow pumps for axial flow compressors
Abstract
The invention discloses a method for processing a saddle groove blade seat of a large axial flow compressor, which comprises the steps of respectively roughly processing the inner wall, the outer wall and the end surfaces at two sides of a cylindrical blank; carrying out heat treatment on the cylindrical blank after rough machining to enable the hardness of the cylindrical blank to reach the heat treatment hardness of a preset workpiece; and (3) performing finish machining on each part of the cylindrical blank respectively, and machining a saddle-shaped groove on one end surface of the cylindrical blank so as to complete machining of the blade seat with the saddle-shaped groove. The invention realizes a practical, high-efficiency and high-precision machining method for the saddle-shaped groove blade seat of the large axial flow compressor, and solves the technical blank of the current machining of the saddle-shaped groove blade seat.
Description
Technical Field
The invention relates to the technical field of large axial flow compressors, in particular to a method for machining a saddle groove blade seat of a large axial flow compressor.
Background
The large-scale axial flow compressor unit is applied to the axial flow compressor unit in large-scale aerodynamic experimental equipment, and the design precision requirement of the centrifugal compressor must be completely executed on the design and manufacturing precision. The hub, which is one of the main components of the rotor spindle of the large axial flow compressor, has an outer diameter of 3.7 m and is of a welded thin-wall structure, so that the hub is different from a common fan spindle hub and a common centrifugal compressor spindle hub. The blade seat is a key important part in a rotor hub of an axial flow compressor. The blade seat has the following structure: a cylindrical workpiece with a saddle-shaped groove on one end surface is shown in figure 1; the method is characterized in that: the number of single workpieces of the workpiece is large, and the processing difficulty of the saddle-shaped groove is high. Therefore, a feasible processing method is required and processing efficiency can be effectively improved by this method.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for processing a saddle groove blade seat of a large axial flow compressor.
A method for processing a saddle groove blade seat of a large axial flow type compressor comprises the following steps:
respectively carrying out rough machining on the inner wall, the outer wall and the end surfaces at two sides of the cylindrical blank;
carrying out heat treatment on the cylindrical blank after rough machining to enable the hardness of the cylindrical blank to reach the heat treatment hardness of a preset workpiece;
and (3) performing finish machining on each part of the cylindrical blank respectively, and machining a saddle-shaped groove on one end surface of the cylindrical blank so as to complete machining of the blade seat with the saddle-shaped groove.
Further, when the end faces of the inner wall, the outer wall and both sides of the cylindrical blank are respectively subjected to rough machining, the method comprises the following steps:
according to the size requirement of the blade seat, the cylindrical blank to be machined is roughly machined, and the allowance of 5MM is left on one side of each part of the roughly machined cylindrical blank, so that the cylindrical blank is guaranteed to have enough machining allowance for finishing after heat treatment is completed, and subsequent machining is completed.
Further, the heat treatment hardness of the preset workpiece of the cylindrical blank is HB 215-295.
Further, the heat treatment of the roughly machined cylindrical material includes:
normalizing treatment: heating the cylindrical blank after rough machining to 960-1000 ℃, preserving heat for 2-3 hours, and then air cooling;
quenching treatment: heating the cylindrical blank subjected to normalizing treatment to 850-870 ℃, preserving heat for 2-3 hours, and then cooling with oil;
tempering treatment: heating the quenched cylindrical blank to 620-640 ℃, preserving the heat for 3-4 hours, and then cooling in air.
Further, the finish machining of each portion of the cylindrical material includes:
aligning according to the drawing of the blade seat and the inner wall of the cylindrical blank, and performing finish machining on the outer wall of the cylindrical blank and the flat end face on one side of the cylindrical blank;
fixing the cylindrical blank on a workbench of a numerical control milling machine after the cylindrical blank is subjected to surface marking and alignment according to the finished flat end surface of the cylindrical blank, and ensuring that the coaxiality of the cylindrical blank and the center of a machine tool is not more than 0.02 mm;
processing a saddle-shaped groove on the end surface of the other side of the cylindrical blank by a numerical control milling machine;
after the outer wall and the flat end face of the cylindrical blank are aligned, the inner wall of the cylindrical blank is subjected to finish machining, so that the thickness of the cylindrical blank reaches the design size of the blade seat.
Furthermore, when the cylindrical blank is fixed on a workbench of a numerical control milling machine after the cylindrical blank is subjected to surface alignment according to the finished flat end surface of the cylindrical blank, the method comprises the following steps:
placing the cylindrical blank on a special tool, and performing meter making and alignment through one side of the special tool fixed with the flat end face of the cylindrical blank;
when the coaxiality of the center of one side of the special tool fixed with the flat end face of the cylindrical blank and the center of the machine tool is not more than 0.02mm, the special tool is fixed on a workbench of the numerical control milling machine, and the cylindrical blank is fixed on the workbench of the numerical control milling machine.
Further, the special tool comprises:
the positioning seat is used for placing the cylindrical blank and making the cylindrical blank be subjected to surface printing and alignment on a workbench of the numerical control milling machine;
and the fixing mechanism comprises a pressing plate, a central hole and a bolt, wherein the pressing plate is used for being placed on one side of the cylindrical blank, which is far away from the workbench of the numerical control milling machine, the central hole is formed in the center of the pressing plate, and the bolt can penetrate through the central hole, and two ends of the bolt are detachably connected with the central hole and the workbench of the numerical control milling machine respectively.
Further, when fixing the special tool on the workbench of the numerical control milling machine and fixing the cylindrical blank on the workbench of the numerical control milling machine, the method comprises the following steps:
aligning the positioning seat at the center of the machine tool, and fixing the positioning seat on a workbench of a numerical control milling machine, wherein the coaxiality of the center of the positioning seat and the center of the machine tool is not more than 0.02 mm;
placing the cylindrical blank in the positioning seat, and placing the pressing plate on one side of the cylindrical blank, which is far away from the workbench of the numerical control milling machine;
and (3) penetrating a bolt through a central hole on the pressing plate, and connecting two ends of the bolt with the central hole and a machine tool respectively to finish the fixation of the cylindrical blank on a workbench of the numerical control milling machine.
Further, when the pressing plate is placed on one side of the cylindrical blank far away from the workbench of the numerical control milling machine, the method comprises the following steps:
and processing a spigot at the inner wall of one side of the cylindrical blank, which is far away from the workbench of the numerical control milling machine, wherein the spigot is used for fixing the outer edge of the pressing plate on the inner wall of the cylindrical blank when the pressing plate is connected with the workbench of the numerical control milling machine through a bolt.
The invention provides a method for processing a saddle groove blade seat of a large axial flow compressor, which comprises the steps of respectively roughly processing the inner wall, the outer wall and the end surfaces at two sides of a cylindrical blank; carrying out heat treatment on the cylindrical blank after rough machining to enable the hardness of the cylindrical blank to reach the heat treatment hardness of a preset workpiece; and (3) performing finish machining on each part of the cylindrical blank respectively, and machining a saddle-shaped groove on one end surface of the cylindrical blank so as to complete machining of the blade seat with the saddle-shaped groove. The invention realizes a practical, high-efficiency and high-precision machining method for the saddle-shaped groove blade seat of the large axial flow compressor, and solves the technical blank of the current machining of the saddle-shaped groove blade seat.
Drawings
FIG. 1 is a schematic structural view of a saddle groove blade seat;
FIG. 2 is a schematic flow chart of a method for machining a saddle-groove blade seat of a large axial flow compressor according to an exemplary embodiment of the present invention;
FIG. 3 is a schematic flow chart of another method for machining a saddle-groove blade seat of a large axial flow compressor according to an exemplary embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for machining a saddle-groove blade seat of a large axial flow compressor according to another exemplary embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a dedicated tool according to an exemplary embodiment of the present invention;
fig. 6 is a schematic flow chart of a method for machining a saddle-groove blade seat of a large axial flow compressor according to another exemplary embodiment of the present invention.
Detailed Description
In order to overcome the defects in the prior art, the invention provides a method for processing a saddle groove blade seat of a large axial flow compressor. In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the preferred embodiments of the present invention. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below by reference are exemplary and are intended to be illustrative of the invention, but are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The following describes embodiments of the present invention in detail.
As shown in fig. 1, a method for processing a saddle groove blade seat of a large axial flow compressor includes:
and S100, respectively performing rough machining on the inner wall, the outer wall and the end faces on the two sides of the cylindrical blank.
As a preferred embodiment, step S100 includes:
according to the size requirement of the blade seat, the cylindrical blank to be machined is roughly machined, and the allowance of 5MM is left on one side of each part of the roughly machined cylindrical blank, so that the cylindrical blank is guaranteed to have enough machining allowance for finishing after heat treatment is completed, and subsequent machining is completed.
And S200, carrying out heat treatment on the cylindrical blank after rough machining to enable the hardness of the cylindrical blank to reach the heat treatment hardness of a preset workpiece.
In a preferred embodiment, the predetermined workpiece of the cylindrical blank has a heat treatment hardness of HB 215-295.
Further, the heat treatment of the roughly machined cylindrical material includes:
normalizing treatment: heating the cylindrical blank after rough machining to 960-1000 ℃, preserving heat for 2-3 hours, and then air cooling;
quenching treatment: heating the cylindrical blank subjected to normalizing treatment to 850-870 ℃, preserving heat for 2-3 hours, and then cooling with oil;
tempering treatment: heating the quenched cylindrical blank to 620-640 ℃, preserving the heat for 3-4 hours, and then cooling in air.
S300, performing finish machining on each part of the cylindrical blank respectively, and machining a saddle-shaped groove on one end face of the cylindrical blank so as to complete machining of the blade seat with the saddle-shaped groove.
Wherein, the saddle-shaped groove processed on one end surface of the cylindrical blank is a 45-degree groove processed on the intersecting line position generated by the intersection of the blade seat and the hub outer cylinder.
As a preferred embodiment, as shown in fig. 3, the finish machining of each portion of the cylindrical material includes:
s301, according to the drawing of the blade seat, the inner wall of the cylindrical blank is aligned, and the outer wall and the flat end face on one side of the cylindrical blank are subjected to finish machining.
S302, performing table alignment on the finished flat end surface of the cylindrical blank according to the finished flat end surface of the cylindrical blank, and fixing the cylindrical blank on a workbench of a numerical control milling machine, wherein the coaxiality of the cylindrical blank and the center of a machine tool is not more than 0.02 mm.
As shown in fig. 4, step S302 includes:
s302-1, placing the cylindrical blank on a special tool, and performing meter making and alignment through one side of the special tool fixed with the flat end face of the cylindrical blank;
s302-2, when the coaxiality of the center of one side of the special tool fixed with the flat end face of the cylindrical blank and the center of the machine tool is not more than 0.02mm, fixing the special tool on a workbench of a numerical control milling machine to complete the fixation of the cylindrical blank on the workbench of the numerical control milling machine.
S303, processing a saddle-shaped groove on the end surface of the other side of the cylindrical blank by a numerical control milling machine;
s304, after the outer wall and the flat end face of the cylindrical blank are aligned, the inner wall of the cylindrical blank is subjected to finish machining, and the thickness of the cylindrical blank reaches the design size of the blade seat.
Further, as shown in fig. 5, the special tool includes a positioning seat 1 and a fixing mechanism, wherein the positioning seat is used for placing the cylindrical blank and making the cylindrical blank form a table on a workbench of a numerical control milling machine for alignment; the fixing mechanism comprises a pressing plate 2, a center hole 3 and a bolt 4, wherein the pressing plate 2 is used for being placed on one side, away from the numerical control milling machine workbench, of the cylindrical blank, the center hole 3 is formed in the center of the pressing plate 2, the bolt 4 can penetrate through the center hole 3, and two ends of the bolt 4 are detachably connected with the center hole 3 and the numerical control milling machine workbench respectively.
Further, as shown in fig. 6, when the special tool is fixed on the workbench of the numerical control milling machine to complete the fixing of the cylindrical blank on the workbench of the numerical control milling machine, the method includes:
s302-2a, aligning the positioning seat at the center of the machine tool, and fixing the positioning seat on a workbench of a numerical control milling machine, wherein the coaxiality of the center of the positioning seat and the center of the machine tool is not more than 0.02 mm;
because the hole size of positioning seat is based on the little clearance fit of the excircle size design of blade seat, consequently, the blade seat can directly be placed in having passed through the alignment and compress tightly in the upper positioning seat of milling machine, need not secondary alignment and can fix a position the blade seat.
S302-2b, placing the cylindrical blank in the positioning seat, and placing the pressing plate on one side of the cylindrical blank, which is far away from a workbench of the numerical control milling machine;
specifically, step S302-2b further includes:
and processing a spigot at the inner wall of one side of the cylindrical blank, which is far away from the workbench of the numerical control milling machine, wherein the spigot is used for fixing the outer edge of the pressing plate on the inner wall of the cylindrical blank when the pressing plate is connected with the workbench of the numerical control milling machine through a bolt.
And S302-2c, penetrating a bolt through a central hole in the pressing plate, and respectively connecting two ends of the bolt with the central hole and a machine tool to complete the fixation of the cylindrical blank on the workbench of the numerical control milling machine.
Because one side end face of the blade seat is the saddle-shaped groove, when the workpiece is machined, firstly, after the workpiece has certain size and appearance structural conditions through turning, then, a special tool is used for assisting clamping, aligning and compressing the workpiece, a numerical control program is programmed by using a numerical control milling machine to realize the machining of the saddle-shaped groove, and finally, the allowance of an inner hole is turned to finish the whole machining of the workpiece. Through the tool and the using steps, the rapid alignment and clamping of blade seat processing are realized, the rapid change of batch workpiece processing is realized, the problems of repeated alignment and time waste of clamping during batch workpiece single piece processing are solved, the working efficiency is greatly improved, and the stability of the processing quality is ensured.
The invention provides a method for processing a saddle groove blade seat of a large axial flow compressor, which comprises the steps of respectively roughly processing the inner wall, the outer wall and the end surfaces at two sides of a cylindrical blank; carrying out heat treatment on the cylindrical blank after rough machining to enable the hardness of the cylindrical blank to reach the heat treatment hardness of a preset workpiece; and (3) performing finish machining on each part of the cylindrical blank respectively, and machining a saddle-shaped groove on one end surface of the cylindrical blank so as to complete machining of the blade seat with the saddle-shaped groove. The invention realizes a practical, high-efficiency and high-precision machining method for the saddle-shaped groove blade seat of the large axial flow compressor, and solves the technical blank of the current machining of the saddle-shaped groove blade seat.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. A method for processing a saddle groove blade seat of a large axial flow type compressor is characterized by comprising the following steps:
respectively carrying out rough machining on the inner wall, the outer wall and the end surfaces at two sides of the cylindrical blank;
carrying out heat treatment on the cylindrical blank after rough machining to enable the hardness of the cylindrical blank to reach the heat treatment hardness of a preset workpiece, wherein the heat treatment hardness of the preset workpiece of the cylindrical blank is HB 215-295;
respectively carrying out finish machining on each part of the cylindrical blank, and machining a saddle-shaped groove on one end surface of the cylindrical blank so as to complete machining of a saddle-shaped groove blade seat;
wherein, when carrying out the heat treatment to the cylindric blank after the rough machining, include:
normalizing treatment: heating the cylindrical blank after rough machining to 960-1000 ℃, preserving heat for 2-3 hours, and then air cooling;
quenching treatment: heating the cylindrical blank subjected to normalizing treatment to 850-870 ℃, preserving heat for 2-3 hours, and then cooling with oil;
tempering treatment: heating the quenched cylindrical blank to 620-640 ℃, preserving heat for 3-4 hours, and then cooling in air;
wherein, when each part on the cylindric blank is respectively processed finely, include:
aligning according to the drawing of the blade seat and the inner wall of the cylindrical blank, and performing finish machining on the outer wall of the cylindrical blank and the flat end face on one side of the cylindrical blank;
fixing the cylindrical blank on a workbench of a numerical control milling machine after the cylindrical blank is subjected to surface marking and alignment according to the finished flat end surface of the cylindrical blank, and ensuring that the coaxiality of the cylindrical blank and the center of a machine tool is not more than 0.02 mm;
processing a saddle-shaped groove on the end surface of the other side of the cylindrical blank by a numerical control milling machine;
after the outer wall and the flat end face of the cylindrical blank are aligned, the inner wall of the cylindrical blank is subjected to finish machining, so that the thickness of the cylindrical blank reaches the design size of the blade seat;
and after the flat end face of the cylindrical blank which is finished is used for marking and aligning the cylindrical blank, the cylindrical blank is fixed on a workbench of a numerical control milling machine, and the method comprises the following steps:
placing the cylindrical blank on a special tool, and performing meter making and alignment through one side of the special tool fixed with the flat end face of the cylindrical blank;
when the coaxiality of the center of one side of the special tool fixed with the flat end face of the cylindrical blank and the center of the machine tool is not more than 0.02mm, fixing the special tool on a workbench of a numerical control milling machine to complete the fixation of the cylindrical blank on the workbench of the numerical control milling machine;
wherein, special frock includes:
the positioning seat is used for placing the cylindrical blank and making the cylindrical blank be subjected to surface printing and alignment on a workbench of the numerical control milling machine;
and the fixing mechanism comprises a pressing plate, a central hole and a bolt, wherein the pressing plate is used for being placed on one side of the cylindrical blank, which is far away from the workbench of the numerical control milling machine, the central hole is formed in the center of the pressing plate, and the bolt can penetrate through the central hole, and two ends of the bolt are detachably connected with the central hole and the workbench of the numerical control milling machine respectively.
2. The method of claim 1, wherein the rough machining of the inner wall, the outer wall and the end surfaces of the two sides of the cylindrical blank comprises:
according to the size requirement of the blade seat, the cylindrical blank to be machined is roughly machined, and the allowance of 5MM is left on one side of each part of the roughly machined cylindrical blank, so that the cylindrical blank is guaranteed to have enough machining allowance for finishing after heat treatment is completed, and subsequent machining is completed.
3. The method for processing the saddle-shaped groove blade seat of the large axial flow type compressor according to claim 1, wherein when the special tool is fixed on a workbench of a numerical control milling machine to complete the fixation of the cylindrical blank on the workbench of the numerical control milling machine, the method comprises the following steps:
aligning the positioning seat at the center of the machine tool, and fixing the positioning seat on a workbench of a numerical control milling machine, wherein the coaxiality of the center of the positioning seat and the center of the machine tool is not more than 0.02 mm;
placing the cylindrical blank in the positioning seat, and placing the pressing plate on one side of the cylindrical blank, which is far away from the workbench of the numerical control milling machine;
and (3) penetrating a bolt through a central hole on the pressing plate, and connecting two ends of the bolt with the central hole and a machine tool respectively to finish the fixation of the cylindrical blank on a workbench of the numerical control milling machine.
4. The method for machining the saddle-groove blade seat of the large axial flow compressor as claimed in claim 3, wherein when the pressing plate is placed on the side of the cylindrical blank away from the workbench of the numerically controlled milling machine, the method comprises:
and processing a spigot at the inner wall of one side of the cylindrical blank, which is far away from the workbench of the numerical control milling machine, wherein the spigot is used for fixing the outer edge of the pressing plate on the inner wall of the cylindrical blank when the pressing plate is connected with the workbench of the numerical control milling machine through a bolt.
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