A method for processing a vane v-groove

Abstract

The application provides a machining method of a V-shaped groove of a blade, which converts the V-shaped groove into a flow channel of a virtual impeller through coordinate conversion, then borrows a machining program of the flow channel of the impeller, uses a ball end cutter with a diameter smaller than a corner radius R of a groove bottom of the V-shaped groove and a blade length greater than a groove depth, and performs five-axis linkage dynamic machining, so that the machining is completed based on one layer of machining mode, no cutter needs to be replaced during the machining, the machining efficiency is high, and the cutter cost is low. Meanwhile, the machining of the V-shaped groove can be completed by using a flow channel machining program in the machining program of the impeller in the prior art, the program development cost is small, and the method is more practical.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field, in particular to a kind of processing method of blade V-shaped groove. BACKGROUND

[0002] V-shaped groove on blade is mostly seen in weight-reducing groove of blade root and blade crown, self-locking blade crown lock port, etc., since it is mostly curved surface or double-face angle deep groove, so forging piece generally cannot be formed, needs large excess rough machining, and generally the top of V-shaped groove is large, groove bottom is small, rough machining needs multiple cutters to process, and processing time is long and cutter consumption is large. Figure 1 As shown in the embodiment, V-shaped groove is located at blade crown.

[0003] In prior art, for the processing of V-shaped groove, it is mostly completed by five-axis numerical control milling machine based on the processing mode of multiple layers approaching of multiple diameter cutters: first, the upper half is roughened by layering with suitable larger diameter end mill, then the lower half is roughened by layering with small diameter hard alloy end mill, and finally the R angle at groove bottom is roughened by layering with small diameter ball head cutter.This kind of processing method not only needs to replace multiple cutters, produces large cutter consumption, and processing time is long, efficiency is low. SUMMARY

[0004] In order to solve the problems in prior art that multiple cutters need to be replaced in the processing method of blade V-shaped groove, large cutter consumption is produced, processing time is long, and efficiency is low, the present application provides a kind of processing method of blade V-shaped groove, which can not need to replace multiple cutters, and processing time is short and efficiency is high.

[0005] The technical scheme of the present application is as follows: a kind of processing method of blade V-shaped groove, which is characterized by comprising the following steps:

[0006] S1: confirming the groove type characteristics of V-shaped groove to be processed on blade:

[0007] The groove type characteristics include: groove bottom fillet radius R, groove depth h, width w, groove bottom length l, and curved surface a and curved surface b intersecting with groove bottom;

[0008] S2: based on the groove type characteristics, the simulation model of the V-shaped groove to be processed is constructed with groove depth direction as Z axis direction and the plane where two opening ends are located as X axis and Y axis plane;

[0009] S3: taking Z axis as central axis, taking R1 as inner circle radius and R1+l as outer circle radius, the V-shaped groove to be processed is rotated around the Z axis to obtain a impeller simulation model, which is recorded as: virtual impeller; wherein R1 is a positive integer; the origin of virtual coordinate system is the rotation center of virtual impeller;

[0010] The groove bottom of the V-shaped groove constitutes a virtual flow channel between two adjacent blades of the virtual impeller; and the curved surface a and the curved surface b constitute adjacent surfaces of the two adjacent blades of the virtual impeller.

[0011] S4: selecting a ball tool of five-axis numerical control as a machining tool;

[0012] The diameter of the ball tool is smaller than the corner radius R of the groove bottom of the V-shaped groove, and the blade length of the ball tool is greater than the groove depth h.

[0013] S5: placing a workpiece to be machined on a numerical control machine tool, calling a flow channel machining program in an impeller machining program, and machining the virtual flow channel in which the V-shaped groove to be machined is located, so as to complete the machining of the V-shaped groove to be machined at one time.

[0014] It is further characterized in that:

[0015] The machining process of the virtual flow channel is:

[0016] a1: setting tool parameters:

[0017] The tool parameters include: cutting depth AP, tool rotation speed S, tool feed speed F, and forward step distance AE of the tool;

[0018] The cutting depth of the virtual flow channel is the groove depth h;

[0019] a2: the ball tool enters the workpiece to be machined with a cutting depth AP;

[0020] a3: after entering, the ball tool is moved from one side of the virtual blade to the other side of the virtual blade at a tool rotation speed S and a tool feed speed F;

[0021] a4: the ball tool cyclically executes step a3 with a forward step distance AE until the virtual flow channel with a length l is completely machined.

[0022] The machining method of the blade V-shaped groove provided in the present application converts the V-shaped groove into a flow channel of a virtual impeller through coordinate conversion, and then uses a ball tool with a diameter smaller than the corner radius R of the groove bottom of the V-shaped groove and a blade length greater than the groove depth to dynamically machine by five-axis linkage, so as to be machined in place based on a one-layer machining method. The machining tool does not need to be replaced during the machining process, the machining efficiency is high, the tool cost is low, and the machining method is more practical. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of a multi-layer approximation machining method of a plurality of diameter tools in the prior art;

[0024] Figure 2 Figure 1 is a schematic diagram of the correspondence between the V-shaped groove and the virtual flow passage in the method of the present application;

[0025] Figure 3 Figure 2 is a schematic diagram of the structure of the virtual impeller in the method of the present application;

[0026] Figure 4 Figure 3 is an embodiment of the V-shaped groove to be machined on the blade. DETAILED DESCRIPTION

[0027] As shown in Figures 2-4 , the present application comprises a method for machining a V-shaped groove on a blade, which comprises the following steps.

[0028] S1: Confirm the groove type characteristics of the V-shaped groove to be machined on the blade:

[0029] The groove type characteristics include: the fillet radius R of the groove bottom, the groove depth h, the width w, the length l of the groove bottom, and the two curved surfaces a and b intersecting the groove bottom.

[0030] In the embodiment shown in Figure 4 , h = 23 mm, and the angle between the a surface and the b surface is 33°.

[0031] S2: In the UG environment, the V-shaped groove characteristics are reconstructed by coordinate system conversion, remodeling, etc. to construct a simulation model of the V-shaped groove to be machined, with the groove depth direction as the Z-axis direction, and the plane where the two opening ends are located as the X-axis and Y-axis planes.

[0032] S3: Take the Z-axis as the central axis, take R1 as the inner circle radius, and take R1 + l as the outer circle radius, so that the V-shaped groove to be machined rotates around the Z-axis to obtain an impeller simulation model, denoted as: virtual impeller; wherein R1 is a positive integer; the origin of the virtual coordinate system is the center of rotation of the virtual impeller;

[0033] Then: the groove bottom of the V-shaped groove constitutes a virtual flow passage between the adjacent two blades of the virtual impeller; the curved surface a and the curved surface b constitute the adjacent surfaces of the adjacent two blades of the virtual impeller. As shown in Figure 2 and Figure 3 .

[0034] In the method, the V-shaped groove is converted into a flow passage of a virtual impeller, and the existing virtual impeller flow passage machining program can be used or slightly adjusted to be applied to virtual flow passage machining, greatly reducing the development cost and being very practical.

[0035] S4: Select a ball nose tool of five-axis numerical control as the machining tool;

[0036] The diameter of the ball tool is smaller than the fillet radius R of the groove bottom of the V-shaped groove, and the blade length of the ball tool is greater than the groove depth h.

[0037] In this embodiment, the diameter of the ball tool is smaller than the fillet radius R of the V-shaped groove bottom, and the blade length is greater than 23 mm.

[0038] S5: placing the workpiece to be processed on the numerical control machine tool, calling the flow passage processing program in the impeller processing program, processing the virtual flow passage where the V-shaped groove to be processed is located, and completing the processing of the V-shaped groove to be processed at one time.

[0039] The impeller processing program is a relatively mature technology in the prior art. In the present application, the flow passage rough machining program in the impeller processing program in the prior art can be used to process the V-shaped groove. Of course, a flow passage processing program of the impeller processing program can also be compiled by the applicant. The program file generation process is as follows: first, a flow passage rough machining five-axis linkage dynamic machining tool position file is generated; then, a tool position file in the original coordinate system is constructed through the UG tool position transformation function, and then a five-axis machine tool NC program is formed through RCS post-processing; finally, a full-automatic machining process is performed through a five-axis numerical control machine tool to complete the processing of the V-shaped groove.

[0040] In specific implementation, the rough machining process of the virtual flow passage performed on the five-axis numerical control machine tool is as follows:

[0041] a1: setting tool parameters:

[0042] The tool parameters include: cutting depth AP, tool rotation speed S, tool feed speed F, and tool forward step distance AE; the cutting depth of the virtual flow passage is the groove depth h; in this embodiment, the cutting depth AP is 23 mm, the feed F is 2000 mm / min, the rotation speed is 3100 rpm, and the forward step distance is 0.3 mm;

[0043] a2: the ball nose tool enters the workpiece to be processed with the cutting depth AP;

[0044] a3: after entering, the tool rotates at the tool rotation speed S and the tool feed speed F, and moves from one side of the virtual blade to the other side of the virtual blade;

[0045] a4: the ball nose tool cyclically executes step a3 with the forward step distance AE until the virtual flow passage with the length l is completely machined.

[0046] In this embodiment, the angle between the a surface and the b surface is 33°, that is, the angle between the adjacent surfaces of the two adjacent blades of the virtual impeller on the virtual flow passage, i.e., the angle between the virtual blade A surface and the virtual blade B surface, is 33°. During machining, the virtual blade A surface is machined first after entering, and then the tool rotates at the tool rotation speed S and the tool feed speed F to move to the virtual blade B surface, and the inclination angle of the ball nose tool is controlled by the five-axis machine tool. After moving to the B surface, the tool is returned to the A surface, and then the tool walks forward by a step distance AE, and step a3 is continuously executed until the virtual flow passage with the length l is completely machined.

[0047] The blade V-shaped groove machining method can be separated from the multi-layer approximation machining mode of various diameter cutters, a small diameter ball head cutter is used to dynamically machine a layer in a five-axis linkage mode, the machining efficiency is greatly improved, and the cutter cost for machining is reduced.

Claims

1. A method of machining a vane V-groove, characterized by, It comprises the following steps: S1: confirming the groove type characteristics of the V-shaped groove to be processed on the blade: The groove type characteristics include: groove bottom fillet radius R, groove depth h, width w, groove bottom length l, and curved surface a and curved surface b intersecting with the groove bottom; S2: based on the groove type characteristics, a simulation model of the V-shaped groove to be processed is constructed with the groove depth direction as the Z-axis direction and the plane where the two opening ends are located as the X-axis and Y-axis planes; S3: taking the Z-axis as the central axis, R1 as the inner circle radius, and R1+l as the outer circle radius, the V-shaped groove to be processed is rotated around the Z-axis to obtain a impeller simulation model, denoted as: virtual impeller; wherein R1 is a positive integer; the origin of the virtual coordinate system is the center of rotation of the virtual impeller; Then: the groove bottom of the V-shaped groove constitutes the virtual flow passage between the two adjacent blades of the virtual impeller; the curved surface a and the curved surface b constitute the adjacent surfaces of the two adjacent blades of the virtual impeller; S4: selecting a ball-end cutter of five-axis numerical control as the machining tool; The diameter of the ball-end cutter is smaller than the V-shaped groove bottom fillet radius R, and the blade length of the ball-end cutter is greater than the groove depth h; S5: placing the workpiece to be processed on the numerical control machine tool, calling the flow passage machining program in the impeller machining program, machining the virtual flow passage of the V-shaped groove to be processed, and completing the machining of the V-shaped groove to be processed at one time.

2. The method of claim 1, wherein: The machining process of the virtual flow passage is: a1: setting tool parameters: The tool parameters include: cutting depth AP, tool rotation speed S, tool feed speed F, and tool forward step distance AE; The cutting depth of the virtual flow passage is the groove depth h; a2: the ball-end cutter enters the tool on the workpiece to be processed with the cutting depth AP; a3: after entering the tool, the ball-end cutter moves from one side of the virtual blade to the other side of the virtual blade with the tool rotation speed S and the tool feed speed F; a4: the ball-end cutter executes step a3 cyclically with the forward step distance AE until the virtual flow passage with length l is completely machined.

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