CN113927108A - Closed flow passage processing method of two-dimensional bending moment radial diffuser - Google Patents

Closed flow passage processing method of two-dimensional bending moment radial diffuser Download PDF

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CN113927108A
CN113927108A CN202111326210.6A CN202111326210A CN113927108A CN 113927108 A CN113927108 A CN 113927108A CN 202111326210 A CN202111326210 A CN 202111326210A CN 113927108 A CN113927108 A CN 113927108A
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flow channel
electrode
point set
bending moment
throat
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CN113927108B (en
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肖威红
欧佳昕
张斌
詹伟
李勇强
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AECC South Industry Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
    • B23H1/04—Electrodes specially adapted therefor or their manufacture
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects

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  • Mechanical Engineering (AREA)
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  • Manufacturing & Machinery (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

The invention discloses a closed flow channel processing method of a two-dimensional bending moment radial diffuser, which redesigns and manufactures a rough processing electrode and a finish processing electrode through a theoretical cavity based on an inter-blade flow channel, adopts a horizontal transverse processing mode for the two-dimensional bending moment flow channel, can withdraw the electrode from the two-dimensional bending moment flow channel along the horizontal direction without interfering with the flow channel, and can be well suitable for the large-size radial diffuser with a two-dimensional bending moment flow channel structure. And only one rough machining electrode and one finish machining electrode are adopted, the number of the used electrodes is small, the tool catching marks on the free-form surface are reduced, and the smoothness of the blade profile can be well ensured. Meanwhile, only two procedures of rough machining and finish machining are carried out, and the finish machining electrode can finish machining of the R corners of the flow channel and the flow channel inlet at one time, so that the machining efficiency is greatly improved, and the machining precision is high.

Description

Closed flow passage processing method of two-dimensional bending moment radial diffuser
Technical Field
The invention relates to the technical field of closed flow passage processing of radial diffusers, in particular to a closed flow passage processing method of a two-dimensional bending moment radial diffuser.
Background
In advanced aerospace and weaponry engine designs, integral component designs are increasingly adopted, and radial diffusers belong to one of the integral components and are critical parts on the aero-engine. The closed flow passage of the radial diffuser part with the integral structure is generally short in length, about 110mm, and the shape of the flow passage channel is of a symmetrical and linear structure. However, as shown in fig. 1, the flow passage length of the existing novel integral component radial diffuser is about 235mm, the part diameter is about 700mm, the structure of the flow passage is asymmetric, the degree of bending of the flow passage shape is large, and the flow passage is of a two-dimensional bending moment structure. Conventional spark-erosion machining adopts vertical processing mode, utilize processing equipment to make the runner be vertical direction promptly, then control electrode processes along vertical, and the processing of runner entrance R angle divide twice to go on, and because this novel radial diffuser of two-dimensional moment of flexure's diameter reaches 700mm, the size is great, current processing equipment can't make the part runner carry out vertical processing, need research and development one set of new processing equipment of production again, the production cycle is long, the input cost is high, therefore, this novel radial diffuser of two-dimensional moment of flexure can't adopt the conventional thinking of electric spark to process.
In addition, the throat area of the flow passage of the radial diffuser is an important parameter influencing the performance of the engine, the measurement of the throat area of the flow passage becomes a key in the manufacturing and assembling processes of the engine, and the novel two-dimensional bending moment radial diffuser is large in bending degree of the flow passage shape, so that much inconvenience is brought to the measurement. The area of the throat of the current flow channel is obtained by indirectly calculating the width of the machined electrode, the discharge gap and the height of each channel, or measuring each channel by designing go-no-go gauge measuring tools with different specifications and quantities. The process is complicated and low in efficiency due to the fact that a plurality of go-no go gauge measuring tools are used for measuring, and a plurality of groups of go-no go gauges need to be manufactured. In addition, because the number of electrodes is large during electric spark finish machining, abrasion exists after each electrode is machined into a flow channel, the abrasion degree is different, the abrasion condition of each electrode needs to be considered to be calculated respectively, and the efficiency is low. In addition, the two methods obtain the area of the flow channel throat by an indirect method, so that the measurement precision is poor, the manual operation is complicated, the time consumption is long, the efficiency is low, and the calculation error is easily caused. Meanwhile, all data are required to be imported into professional software for wall thickness measurement, and finally, the position with the thinnest wall thickness is captured for measurement, so that the conditions of complicated operation process and low efficiency exist.
Disclosure of Invention
The invention provides a closed flow passage machining method of a two-dimensional bending moment radial diffuser, and aims to solve the technical problem that the existing electric spark machining method cannot be suitable for the two-dimensional bending moment radial diffuser.
According to one aspect of the invention, a closed flow passage processing method of a two-dimensional bending moment radial diffuser is provided, which comprises the following steps:
designing and manufacturing electrodes based on a theoretical cavity of an interlobe runner, wherein the electrodes comprise rough machining electrodes and finish machining electrodes;
performing transverse rough machining on the flow channel between the blades along the horizontal direction by using a rough machining electrode;
and (4) finishing the flow channel between the blades along the horizontal direction by using a finishing electrode and machining the R corner of the inlet of the flow channel.
Further, the process of designing and manufacturing the electrode based on the theoretical cavity of the flow channel between the leaves comprises the following steps:
horizontal lines are respectively made at the inlets of the upper curve and the lower curve of the flow channel between the blades, so that the two horizontal lines are not intersected with the upper curve and the lower curve of the flow channel, the distance between the two horizontal lines is smaller than the distance between the upper horizontal tangent line and the lower horizontal tangent line of the flow channel between the blades, and the horizontal planes where the two horizontal lines are respectively positioned are respectively used as the upper end surface and the lower end surface of the electrode head.
Further, the process of designing and manufacturing the electrode based on the theoretical cavity of the flow channel between the leaves further comprises the following steps:
and designing the forming surface of the electrode by adopting an equal-gap method.
Further, the process of designing the molding surface of the electrode by using the equal gap method specifically includes the following steps:
setting the discharge gap as delta, selecting a point set P on the molded surface of the region to be processed of the flow channel between the leaves, and taking each point P in the point set PiNormal unit vector n of profilepiBased on the formula Pni＝Pi-δnpiCalculating to obtain corresponding model value point PniMultiple type point PniForm a set of points PnSaid set of points PnIt is the theoretical plane of the electrode forming surface.
Furthermore, an offset of 0.5mm is reserved between the electrode forming surfaces of the rough machining electrode and the finish machining electrode and the molded surface of the flow channel between the blades.
Furthermore, the head of the finish machining electrode is designed into an arc section at the position of the R corner corresponding to the entrance of the flow channel, the curvature of the arc section is the same as that of the R corner, and the finish machining of the flow channel and the R corner of the entrance of the flow channel at one time is ensured through the translation machining of the finish machining electrode.
Further, the following contents are also included:
and collecting a waist-shaped hole point set A, a waist-shaped hole runner right side point set B, a throat runner left side point set S and a throat runner right side point set R by using three-coordinate metering equipment, and automatically calculating the total throat area and the minimum wall thickness set of the flow channels among the blades.
Further, the process of collecting the waist-shaped hole point set a, the waist-shaped hole runner right side point set B, the throat runner left side point set S and the throat runner right side point set R by using the three-coordinate measuring equipment and automatically calculating the total throat area and the minimum wall thickness set of the flow channel between the leaves specifically comprises the following contents:
determining a coordinate system and an angular direction on the part in a three-coordinate measuring device;
determining a measurement range and point taking precision;
respectively acquiring a waist-shaped hole point set A, a waist-shaped hole runner right side point set B, a throat runner left side point set S and a throat runner right side point set R by using three-coordinate metering equipment;
automatically calculating to obtain the minimum wall thickness L of each waist-shaped hole based on the waist-shaped hole point set A and the right side point set B of the flow channel at each waist-shaped holeWAutomatically calculating to obtain the minimum throat width D of each flow channel based on the point set S on the left side of the flow channel at the throat and the point set R on the right side of the flow channel at the throati；
Acquiring the number n of flow channels, the number Q of blades with kidney-shaped holes and a flow channel height set H, and combining the minimum wall thickness L at each kidney-shaped holeWAnd automatically calculating the minimum throat width D of each flow channel to obtain the total throat area and the minimum wall thickness set of the flow channels between the blades.
Further, the process of determining the measurement range and the point taking accuracy specifically includes the following steps:
and (3) taking points on the length of 5-10 mm before and after the theoretical minimum position, wherein the point taking precision is 0.003 mm.
The invention has the following effects:
according to the closed flow channel processing method of the two-dimensional bending moment radial diffuser, the rough processing electrode and the finish processing electrode are redesigned and manufactured through the theoretical cavity based on the flow channel between the blades, the horizontal transverse processing mode is adopted for the two-dimensional bending moment flow channel, the electrode can be withdrawn from the two-dimensional bending moment flow channel along the horizontal direction without interfering with the flow channel, and the closed flow channel processing method can be well suitable for the large-size radial diffuser with the two-dimensional bending moment flow channel structure. And only one rough machining electrode and one finish machining electrode are adopted, the number of the used electrodes is small, the tool catching marks on the free-form surface are reduced, and the smoothness of the blade profile can be well ensured. Meanwhile, only two procedures of rough machining and finish machining are carried out, and the finish machining electrode can finish machining of the R corners of the flow channel and the flow channel inlet at one time, so that the machining efficiency is greatly improved, and the machining precision is high.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a two-dimensional bending moment radial diffuser in a partial cross-sectional configuration.
Fig. 2 is a schematic flow chart of a closed flow passage processing method of a two-dimensional bending moment radial diffuser according to a preferred embodiment of the invention.
Fig. 3 is a schematic diagram illustrating horizontal lines are drawn from upper and lower curved inlets of a two-dimensional bending moment flow channel in a closed flow channel processing method of a two-dimensional bending moment radial diffuser according to a preferred embodiment of the present invention.
Fig. 4 is a schematic illustration of the rough electrode of the preferred embodiment of the present invention with an offset between the forming surface and the runner profile.
Fig. 5 is a schematic diagram of a circular arc section designed at the corner corresponding to the flow channel entrance R on the finishing electrode according to the preferred embodiment of the present invention.
Fig. 6 is a schematic flow chart of a closed flow passage processing method of a two-dimensional bending moment radial diffuser according to another embodiment of the invention.
Fig. 7 is a sub-flowchart of step S4 in fig. 6.
Fig. 8 is a schematic diagram of metering points in a closed flow passage processing method of a two-dimensional bending moment radial diffuser according to another embodiment of the invention.
Fig. 9 is an enlarged view at i in fig. 8.
Fig. 10 is an enlarged schematic view at ii in fig. 8.
Fig. 11 is a logic flow diagram illustrating calculation of a minimum wall thickness in a closed flow path processing method of a two-dimensional bending moment radial diffuser according to another embodiment of the present invention.
Fig. 12 is a logic flow diagram illustrating calculation of a minimum throat width in a closed flow path processing method of a two-dimensional bending moment radial diffuser according to another embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
As shown in fig. 2, a preferred embodiment of the present invention provides a closed flow channel processing method of a two-dimensional bending moment radial diffuser, which includes the following steps:
step S1: designing and manufacturing electrodes based on a theoretical cavity of an interlobe runner, wherein the electrodes comprise rough machining electrodes and finish machining electrodes;
step S2: performing transverse rough machining on the flow channel between the blades along the horizontal direction by using a rough machining electrode;
step S3: and (4) finishing the flow channel between the blades along the horizontal direction by using a finishing electrode and machining the R corner of the inlet of the flow channel.
It can be understood that, in the closed flow channel processing method of the two-dimensional bending moment radial diffuser of the embodiment, the rough processing electrode and the finish processing electrode are redesigned and manufactured through the theoretical cavity based on the inter-blade flow channel, and a horizontal transverse processing mode is adopted for the two-dimensional bending moment flow channel, so that the electrode can be withdrawn from the two-dimensional bending moment flow channel along the horizontal direction without interfering with the flow channel, and the closed flow channel processing method can be well applied to the radial diffuser with a large-size and two-dimensional bending moment flow channel structure. And only one rough machining electrode and one finish machining electrode are adopted, the number of the used electrodes is small, the tool catching marks on the free-form surface are reduced, and the smoothness of the blade profile can be well ensured. Meanwhile, only two procedures of rough machining and finish machining are carried out, and the finish machining electrode can finish machining of the R corners of the flow channel and the flow channel inlet at one time, so that the machining efficiency is greatly improved, and the machining precision is high.
It can be understood that, in the step S1, for the machining of the inter-leaf flow channel (the special-shaped cavity) on the closed integral component, based on the theoretical cavity as the electrode entity, the closed integral component is withdrawn from the inter-leaf flow channel according to a certain trajectory in the environment of the three-dimensional modeling software UG, and the withdrawal trajectory performs boolean reduction operation with the workpiece entity during the withdrawal process, and follows the principle that the electrode entity is subtracted by the minimum volume, so that the movement trajectory of the withdrawal of the whole electrode is the reverse process of the machining movement trajectory, and the electrode entity subjected to the subtraction operation after the withdrawal subtracts the machining gap to obtain the electrode shape to be designed. In addition, in the three-dimensional modeling process, if the electrode profile is damaged in the process of withdrawal, the electrode entity can be reduced by a certain size (the size is compensated by numerical control shaking motion) and the process is carried out again.
Wherein the step S1 includes the following steps:
horizontal lines are respectively made at the inlets of the upper curve and the lower curve of the flow channel between the blades, so that the two horizontal lines are not intersected with the upper curve and the lower curve of the flow channel, the distance between the two horizontal lines is smaller than the distance between the upper horizontal tangent line and the lower horizontal tangent line of the flow channel between the blades, and the horizontal planes where the two horizontal lines are respectively positioned are respectively used as the upper end surface and the lower end surface of the electrode head.
Specifically, as shown in fig. 3, the flow path profile of the two-dimensional bending moment radial diffuser is a two-dimensional bending moment structure, and transverse processing in the horizontal direction should be selected as much as possible in the two-dimensional bending moment structure, which is mainly due to two reasons: (1) because large-size parts cannot be horizontally clamped and vertically processed, if the rotary table and the equipment are large enough, the whole part processing economy is poor, and no existing equipment can meet the requirement in the market; (2) the horizontal transverse processing is selected to consider that the X-axis stroke of the device is longer, and the single-axis feeding processing is easier to control. By rotating the two-dimensional blade profile data diagram, a horizontal line is respectively made from an upper curve inlet and a lower curve inlet of the two-dimensional flow channel (namely the position on the flow channel farthest from the excircle of the radial diffuser), so that the two horizontal lines are not intersected with the upper curve and the lower curve of the flow channel between the blades, and the distance between the two horizontal lines is smaller than the distance between the upper horizontal tangent line and the lower horizontal tangent line of the flow channel between the blades, thereby ensuring that the electrode can be fed to a processing position from an exhaust port through numerical control movement without interference when horizontal transverse processing is carried out on the electrode. Under the condition of ensuring no interference, the height dimension L between two horizontal lines is maximized as much as possible so as to ensure the processing precision.
In addition, the step S1 further includes the following steps:
and designing the forming surface of the electrode by adopting an equal-gap method.
The invention designs the forming surfaces of the rough machining electrode and the finish machining electrode by an equal electrode method, thereby effectively reducing the machining error of the flow channel between the blades.
Specifically, the process of designing the molding surface of the electrode by using the equal gap method specifically includes the following steps:
setting a discharge gap as delta, selecting a point set P on a molded surface of a region to be processed of an inter-leaf flow channel, wherein the point set P comprises enough points, and taking each point P in the point set PiNormal unit vector n of profilepiBased on the formula Pni＝Pi-δnpiCalculating to obtain corresponding model value point PniMultiple type point PniForm a set of points PnSaid set of points PnIt is the theoretical plane of the electrode forming surface.
It can be understood that the molding surfaces of the rough machining electrode and the finish machining electrode are designed according to an equal-gap method in the design process, the flow channel model between the blades can be completely removed from the rough machining electrode and the finish machining electrode, and the flow channel does not interfere with the molding surfaces of the electrodes. However, in the actual machining process, the electrode machining is performed in a numerically controlled oscillation mode, and therefore, it is necessary to consider the displacement of the electrode forming surface. Therefore, as shown in FIG. 4, an offset of 0.5mm is left between the electrode forming surfaces of the rough machined electrode and the finished machined electrode and the inter-leaf flow channel profile. For the finish machining electrode, as shown in fig. 5, the head of the finish machining electrode is designed into an arc section at the R corner position corresponding to the entrance of the flow channel, specifically, the R corners of the upper and lower curves of the entrance of the flow channel are both designed with arc sections, the curvature of the arc sections is the same as that of the R corner of the entrance of the flow channel, and the finish machining of the flow channel and the R corner of the entrance of the flow channel is ensured by the translation machining of the finish machining electrode.
It can be understood that, as shown in fig. 6, in another embodiment of the present invention, the method for processing the closed flow channel of the two-dimensional bending moment radial diffuser further includes the following steps:
step S4: and collecting a waist-shaped hole point set A, a waist-shaped hole runner right side point set B, a throat runner left side point set S and a throat runner right side point set R by using three-coordinate metering equipment, and automatically calculating the total throat area and the minimum wall thickness set of the flow channels among the blades.
It can be understood that, in the closed flow channel processing method of the two-dimensional bending moment radial diffuser of the embodiment, the three-coordinate metering equipment is used for acquiring the waist-shaped hole point set a, the waist-shaped hole flow channel right side point set B, the throat-position flow channel left side point set S and the throat-position flow channel right side point set R, the total throat area and the minimum wall thickness set of the flow channel between the leaves can be obtained through automatic calculation, compared with the two existing measurement modes, the measurement data can be automatically processed, errors caused by manual intervention are reduced, the measurement efficiency is improved, and the direct measurement mode is adopted, so that the measurement precision is improved.
It can be understood that, as shown in fig. 7, the step S4 specifically includes the following steps:
step S41: determining a coordinate system and an angular direction on the part in a three-coordinate measuring device;
step S42: determining a measurement range and point taking precision;
step S43: respectively acquiring a waist-shaped hole point set A, a waist-shaped hole runner right side point set B, a throat runner left side point set S and a throat runner right side point set R by using three-coordinate metering equipment;
step S44: automatically calculating to obtain the minimum wall thickness L of each waist-shaped hole based on the waist-shaped hole point set A and the right side point set B of the flow channel at each waist-shaped holeWAutomatically calculating to obtain the minimum throat width D of each flow channel based on the point set S on the left side of the flow channel at the throat and the point set R on the right side of the flow channel at the throati；
Step S45: acquiring the number n of flow channels, the number Q of blades with kidney-shaped holes and a flow channel height set H, and combining the minimum wall thickness L at each kidney-shaped holeWAnd automatically calculating the minimum throat width D of each flow channel to obtain the total throat area and the minimum wall thickness set of the flow channels between the blades.
Specifically, in step S41, the coordinate system and angular orientation of the radial diffuser are determined in the three-coordinate metrology device in preparation for programming and metrology.
In step S42, as shown in fig. 8 to 10, in order to ensure the accuracy of the measured value, the dot is taken at a length of 5mm to 10mm before and after the theoretical minimum position (i.e., the theoretical minimum wall thickness and the minimum throat width), and the dot-taking accuracy is 0.003 mm.
In step S43, waist-shaped hole point sets a { (a) are acquired by three-coordinate programming, respectivelyx1、Ay1、Az1)，(Ax2、Ay2、Az2)……(Axm、Aym、Azm) The right side point of the flow channel at the waist-shaped hole is set as B { (B)x1、By1、Bz1)，(Bx2、By2、Bz2)……(Bxn、Byn、Bzn) And (R) point set on the left side of the flow channel at the throat, wherein R is { (R)x1、Ry1、Rz1)，(Rx2、Ry2、Rz2)……(Rxm、Rym、Rzm) And (S) determining a right side point S of a flow channel at the throatx1、Sy1、Sz1)，(Sx2、Sy2、Sz2)……(Sxn、Syn、Szn)}。
In step S44, as shown in fig. 11, an initial value of the minimum wall thickness is calculated based on the waist-shaped hole point set a and the waist-shaped hole right side point set B, and the initial value is obtained
Figure BDA0003347244450000081
Then, the distance between each point in the waist-shaped hole point set A and each point in the flow channel right side point set B at the waist-shaped hole is calculated in sequence,
Figure BDA0003347244450000091
then, the distance value L calculated each time is calculatedjkAnd an initial value LwIf L isjkLess than LwThen L will bejkAs a new initial value LwAnd continuously iterating until j is m, k is n, and finally obtaining the LwAnd outputting the minimum wall thickness value.
Similarly, for the minimum throat width, as shown in fig. 12, an initial value of the minimum throat width is calculated based on the set R of the left side points of the throat runners and the set S of the right side points of the throat runners, and the initial value is
Figure BDA0003347244450000092
Then, the distance between each point in the point set R on the left side of the flow channel at the throat and each point in the point S on the right side of the flow channel at the throat is calculated in turn,
Figure BDA0003347244450000093
then, the distance value D calculated each timejkAnd an initial value DiIf D isjkIs less than DiThen D will bejkAs a new initial value DiAnd continuously iterating until j is m, k is n, and obtaining the final DiAnd outputting the value as the minimum throat width value.
It is to be understood that, in step S45, the number n of flow channels, the vane number Q with the kidney-shaped hole, and the flow channel height set H are confirmed, where the vane number Q with the kidney-shaped hole is { Q ═ Q1，Q2…QwH is set as height of flow channel1，H2…HnAnd correspondingly numbering the W values according to the serial numbers of the flow channels, and automatically outputting the total throat area A and the minimum wall thickness set L through logical operation. Specifically, throat area Ai＝Di*Hi，i＝1、2、…、n，AiDenotes the throat area of the ith flow channel, DiDenotes the minimum throat width, H, of the ith flow channeliThe throat height of the ith flow channel is indicated. Thus, the total throat area
Figure BDA0003347244450000094
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A closed flow passage processing method of a two-dimensional bending moment radial diffuser is characterized by comprising the following steps:
designing and manufacturing electrodes based on a theoretical cavity of an interlobe runner, wherein the electrodes comprise rough machining electrodes and finish machining electrodes;
performing transverse rough machining on the flow channel between the blades along the horizontal direction by using a rough machining electrode;
and (4) finishing the flow channel between the blades along the horizontal direction by using a finishing electrode and machining the R corner of the inlet of the flow channel.
2. The closed flow channel processing method of the two-dimensional bending moment radial diffuser of claim 1, wherein the process of designing and manufacturing the electrode based on the theoretical cavity of the inter-blade flow channel comprises the following steps:
horizontal lines are respectively made at the inlets of the upper curve and the lower curve of the flow channel between the blades, so that the two horizontal lines are not intersected with the upper curve and the lower curve of the flow channel, the distance between the two horizontal lines is smaller than the distance between the upper horizontal tangent line and the lower horizontal tangent line of the flow channel between the blades, and the horizontal planes where the two horizontal lines are respectively positioned are respectively used as the upper end surface and the lower end surface of the electrode head.
3. The closed flow channel processing method of the two-dimensional bending moment radial diffuser of claim 2, wherein the process of designing and manufacturing the electrode based on the theoretical cavity of the inter-blade flow channel further comprises the following steps:
and designing the forming surface of the electrode by adopting an equal-gap method.
4. The closed flow channel processing method of the two-dimensional bending moment radial diffuser of claim 3, wherein the process of designing the forming surface of the electrode by the equal gap method specifically comprises the following steps:
setting the discharge gap as delta, selecting a point set P on the molded surface of the region to be processed of the flow channel between the leaves, and taking each point P in the point set PiNormal unit vector n of profilepiBased on the formula Pni＝Pi-δnpiCalculating to obtain corresponding model value point PniMultiple type point PniForm a set of points PnSaid set of points PnIt is the theoretical plane of the electrode forming surface.
5. The closed flow channel processing method of the two-dimensional bending moment radial diffuser of claim 4, wherein an offset of 0.5mm is left between the electrode forming surfaces of the rough processing electrode and the fine processing electrode and the blade flow channel profile.
6. The closed flow channel processing method of the two-dimensional bending moment radial diffuser of claim 5, wherein the head of the finish machining electrode is designed into an arc section at the position corresponding to the R corner of the flow channel inlet, the curvature of the arc section is the same as that of the R corner, and the finish machining of the flow channel and the R corner of the flow channel inlet is guaranteed to be completed in one step through translation machining of the finish machining electrode.
7. The closed flow passage processing method of the two-dimensional bending moment radial diffuser of claim 1, further comprising the following steps:
and collecting a waist-shaped hole point set A, a waist-shaped hole runner right side point set B, a throat runner left side point set S and a throat runner right side point set R by using three-coordinate metering equipment, and automatically calculating the total throat area and the minimum wall thickness set of the flow channels among the blades.
8. The closed flow channel processing method of the two-dimensional bending moment radial diffuser of claim 7, wherein the process of collecting the waist-shaped hole point set a, the waist-shaped hole flow channel right side point set B, the throat flow channel left side point set S and the throat flow channel right side point set R by using a three-coordinate measuring device and automatically calculating the total throat area and the minimum wall thickness set of the flow channel between the blades specifically comprises the following steps:
determining a coordinate system and an angular direction on the part in a three-coordinate measuring device;
determining a measurement range and point taking precision;
respectively acquiring a waist-shaped hole point set A, a waist-shaped hole runner right side point set B, a throat runner left side point set S and a throat runner right side point set R by using three-coordinate metering equipment;
automatically calculating to obtain the minimum wall thickness L of each waist-shaped hole based on the waist-shaped hole point set A and the right side point set B of the flow channel at each waist-shaped holeWAutomatically calculating to obtain the minimum throat width D of each flow channel based on the point set S on the left side of the flow channel at the throat and the point set R on the right side of the flow channel at the throati；
Obtaining the number n of flow channels, with kidney-shaped holesVane number Q and flow channel height set H, in combination with minimum wall thickness L at each kidney-shaped holeWAnd automatically calculating the minimum throat width D of each flow channel to obtain the total throat area and the minimum wall thickness set of the flow channels between the blades.
9. The closed flow channel processing method of the two-dimensional bending moment radial diffuser of claim 8, wherein the process of determining the measurement range and the point taking precision specifically comprises the following steps:
and (3) taking points on the length of 5-10 mm before and after the theoretical minimum position, wherein the point taking precision is 0.003 mm.
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