CN1306352C - Four-axle linked digital controlled processing post processing method and its control system - Google Patents

Abstract

The present invention discloses a four-axle linked digital controlled processing post treatment method and a control system thereof, which is characterized in that a step of cutter dynamic cutting speed data treatment is added in the conventional digital controlled processing procedure post treatment method, and a step of tooling error parameter treatment is added in the machine tool movement parameters. Thus, the cutter cutting speed and the paths in the processing course are dynamically regulated. The present invention effectively prevents a four-axle linked digital controlled processing machine tool from causing impact phenomena for cutters because of different turbine blade molded line sectional curvature in the processing course. As a result, the present invention ensures stable cutting course and uniform cutting speed in the whole digital control processing, extends the service life of cutters, ensures the processing quality of turbine blade molded lines. Besides, because the post treatment method shows consideration for technicians on the parameter design for tooling error compensation, the present invention can achieve the purpose of eliminating tooling errors by directly setting corresponding parameters in a post treatment program without operating complicated programming software.

Description

A kind of four-axle linked digital controlled processing post processing method and control system thereof

Technical field

The present invention relates to the rearmounted method of handling of nc program, especially relate to the rearmounted method and the control system of handling thereof of a kind of nc program of processing turbine blade on four-shaft linkage numerical control machine.

Background technology

Four-axle linked digital control processing is mainly used in crudy and requires height, curved surface molded lines than complicated parts.For example: aircraft, steam turbine, mould, automobile etc. contain the part of curved surface.Four-axle linked process tool route belongs to complicated three-dimensional Tool in Cutting path, and every cutting speed is subjected to the interference of several factors, as: cutting point is to the size of rotation center distance on the turning axle; Four watt levels of lathe when linking simultaneously; Workpiece curved transition size etc.The turbine blade profile blendes together moulding by the employing of a plurality of cross sections and forms, as shown in Figure 1, wherein, 1 is convex profile in the turbine blade, and 2 for advancing the lagging edge profile, the blade profile curvature variation is that interior convex profile 1 changes smooth, advance lagging edge profile 2 change violent, therefore, in the processing during convex profile 1 turning axle rotate slower, X, Y, the movement travel of Z axle are also shorter, and speed will be very fast when this miniwatt motion; And in that to advance lagging edge profile 2 place's curved transition very violent, turning axle rotates very fast in the processing, X, Y, the movement travel of Z axle are also very big, driving power deficiency in powerful like this motion, cause entire system speed to descend, therefore cutter can be subjected to very big impact in whole working angles, and is shown in Figure 2 as cutter path.How carry out data processing, thereby be badly in need of the key of the technical matters that solves when working angles being become steadily just become four-axle linked numerical control machine tool processing turbine blade according to the cutting speed of the dynamic each point of different curvature automatic tool preset tool of turbine blade profile.

Summary of the invention

In order to overcome the uneven phenomenon of Tool in Cutting speed that occurs in the existing four-axle linked numerical control machine tool processing turbine blade, the invention provides the rearmounted disposal route of nc program and the control system of a kind of energy homogenize Tool in Cutting speed, raising part processing quality and efficient.

The present invention is achieved by following technical scheme:

A kind of four-axle linked digital controlled processing post processing method generates the tool path data file according to workpiece molded lines feature and manufacturing procedure, and computing machine is handled described tool path data file by carrying out based on the program of order, and its step comprises:

Compile described tool path data file and will be put into the step of storer through the tool path data file of compiling;

Read described behind the tool path data file of compiling from storer;

The machine tool motion parameter is carried out the step of data processing;

Carry out the step that the cutter error compensation data is handled;

The coordinate figure of each point adds the step of absolute/increment size on the Tool in Cutting track;

And

The dynamic cutting speed of cutter is carried out the step of data processing.

The step that described dynamic cutting speed to cutter is carried out data processing comprises:

Determine the step of cutter distance between the 2 cutter rail points of space in working angles;

Determine the step of cutter vector angle between the 2 cutter rail points of space in working angles;

Determine the step of cutter dynamic cutting speed in working angles.

The described step that the machine tool motion parameter is carried out data processing comprises:

Determine the step of each point coordinate figure on the Tool in Cutting track;

Cutter azimuth between the 2 cutter rail points of space in working angles is converted to the step of lathe turning axle one to the four-quadrant corner;

And

The step that also comprises frock error compensation.

The control system of said method, this control system comprises the computer software that is used to handle the tool path data file, described program software comprises the functional module of working in the following order:

Compile described tool path data file and will be put into the module of storer through the tool path data file of compiling;

Read the module of described tool path data file through compiling from storer:

The machine tool motion parameter is carried out the module of data processing;

Carry out the module that the cutter error compensation data is handled;

The coordinate figure of each point adds the module of absolute/increment size on the Tool in Cutting track;

And

The dynamic cutting speed of cutter is carried out the module of data processing.

The module that described dynamic cutting speed to cutter is carried out data processing comprises:

Determine the module of cutter distance between the 2 cutter rail points of space in working angles;

Determine the module of cutter vector angle between the 2 cutter rail points of space in working angles;

Determine the module of cutter dynamic cutting speed in working angles.

The described module that the machine tool motion parameter is carried out data processing comprises:

Determine each point coordinate figure on the Tool in Cutting track module;

Cutter azimuth between the 2 cutter rail points of space in working angles is converted to the module of lathe turning axle one to the four-quadrant corner;

And

The module that also comprises frock error compensation.

The nc program that is generated by this postposition disposal route has strengthened speed of feed advancing lagging edge profile 2, is used to compensate the underpower phenomenon of lathe at this place, makes lathe add high-power running and satisfies the cutting requirement; In processing, during convex profile 1, obviously reduce cutting speed, make lathe when miniwatt, can keep cutting speed even.Significantly improve cutter life and surface quality of products after the cutting speed homogenize, also improved working (machining) efficiency simultaneously; Owing to be provided with the parameter adjustment of frock error compensation, can dynamically adjust the cutter path that adds man-hour, need not operate loaded down with trivial details programming software the purpose that relevant parameter just can reach compensation frock error directly is set in post processing program.

Description of drawings

Fig. 1 is typical turbine blade molded lines schematic cross-section

The synoptic diagram of cutter path when Fig. 2 is digital control processing

Fig. 3 is the process flow diagram of the rearmounted disposal route of the present invention

Fig. 4 is the blade profile processing program code that is generated by CAM software

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention is done and to be described in further detail:

As shown in Figure 3, be the process flow diagram of the rearmounted disposal route of the present invention.Be that example illustrates specific implementation process of the present invention with the digital control processing of turbine blade profile now: at first, engineering technical personnel require to adopt CAM software according to processing technology, as: Pro/E works out corresponding blade processing program.Generate corresponding tool path data file by this CAM software, its suffix is called NCL, that is: blade profile processing program code, and referring to Fig. 4, the executive program order that is programmed then, in the following order this tool path data file is handled:

At first compile described tool path data file, as: the delegation's compiling of instruction in the tool path data file is become following two parts: operation part and argument section, wherein the common binomial of argument section is divided into 6 groups of data, first comprises three current point coordinate parameters, comprise three current point vector direction parameters in second, to be put into storer through the tool path data file of compiling, computing machine reads described behind the tool path data file of compiling by execution of program instructions from storer then, carry out the dynamic cutting speed data processing of cutter respectively, carrying out the machine tool motion parameter handles, and the determining of cutter error compensation value, add absolute/increment size at last.

Wherein the data processing of the dynamic cutting speed of above-mentioned cutter is a core of the present invention, the method of its processing is: at first determine cutter distance between the adjacent space 2 cutter rail points in working angles according to first in the argument section in the tool path data file through compiling, and then, carry out determining of the dynamic cutting speed of cutter again according to second in the parameter vector angle of determining cutter space 2 cutter rail points in working angles.

That is:

ΔF＝Δθ/Δd×F×e

In the formula: Δ F is that dynamic cutting speed Δ d is space two cutter rail point distances

Δ θ is that space two cutter rail point vector angle F are the standard speed of feed

E is for adjusting coefficient

The method that wherein said machine tool motion parameter is handled is: the size of determining frock error compensation value earlier, determine the coordinate figure of cutter each point in working angles then, the azimuth of cutter space 2 cutter rail points in working angles is converted to lathe turning axle one arrives the four-quadrant corner.Wherein the step of frock error compensation is a core of the present invention, and it realizes that principle is: cutter raw data and frock error are entered machine tool motion parameter treatment step after superimposed once more, and the purpose of realization round-off error, its computational mathematics pattern is:

$\mathrm{\Δdot}=\left|\begin{array}{c}x+\mathrm{\Δx}\\ y+\mathrm{\Δy}\\ z+\mathrm{\Δz}\end{array}\right|$

In the formula: Δ dot is a frock error compensation value

X is that the stroke size delta x of lathe X-axis is the offset of the stroke of lathe X-axis

Y is that the stroke size delta y of lathe Y-axis is the offset of the stroke of lathe Y-axis

Z is that the stroke size delta z of lathe Z axle is the offset of the stroke of lathe Z axle

Wherein said cutter error compensation value implementation is: whole cutter path is divided into three parts, the feed path, cuts and subtract path, withdrawing path, the tool length offset just adds in the feed path, cancels in the withdrawing path.

Wherein said adding is absolute/and the increment size implementation is: and the motor point that will work as pre-treatment is the lathe incremental motion with the exercise data that the argument section in the motor point of first pre-treatment subtracts each other acquisition afterwards, again this data processing is become the NC code.

The control system of said method, this control system comprises the computer software that is used to handle the tool path data file, described program software comprises the functional module of working in the following order:

Compile described tool path data file and will be put into the module of storer through the tool path data file of compiling; Read the module of described tool path data file through compiling from storer; The machine tool motion parameter is carried out the module of data processing; The module of cutter compensation data processing; The module that adds absolute/increment size; And the module of the dynamic cutting speed of cutter being carried out data processing.

The module that described dynamic cutting speed to cutter is carried out data processing comprises: the module of determining cutter distance between the 2 cutter rail points of space in working angles, determine the module of cutter vector angle between the 2 cutter rail points of space in working angles, determine the module of the dynamic cutting speed of cutter.

The source program of the module of the dynamic cutting speed data processing of cutter is:

Public Function stirspeed (pnt1 () As Double, pnt2 () As Double, F As String, R As Double, MaxF As Double, MULTAX As String) As String Dim K As Long, L (3) As Double, A As Double, between V As Double ' computer memory 2 cutter rail points apart from vector angle If pnt1 (4)+pnt1 (5)+pnt1 (6)=0 Then A=VrCalculation (pnt2 (4) between the distance ' calculating end ' computer memory 2 cutter rail points between For K=1 To 3 L (K)=pnt2 (K)-pnt1 (K) L (K)=Abs (L (K)) Next L (0)=L (1) * L (1)+L (2) * L (2)+L (3) * L (3) L (0)=Sqr (L (0)) ' space 2 cutter rail points, pnt2 (5), pnt2 (6)) ' call vector computing function VrCalculation A=Abs (A) Else A=VrCalculation (pnt2 (4), pnt2 (5), pnt2 (6))-VrCalculation (pnt1 (4), pnt1 (5), pnt1 (6)) dynamic F value calculating If F=" " the Then stirspeed=" " of A=Abs (A) End If If A＞180 Then A=360-A End If ' vector angles calculating end '＜!--SIPO＜DP n=" 6 "〉--〉＜dp n=" d6 "/Exit Function End If If A=0 Or L (0)=0 Or R=0 Then stirspeed=Mid (F, 2) Else V=(A/L (0))/(5*R) V=Sqr (V) V=V+1 V=V*Val (Mid (F, 2)) If V＞MaxF Then stirspeed=MaxF Else stirspeed=V End If End If stirspeed=" F " ﹠amp; Amp; Format (stirspeed, " 0.000 ") End Function

The described module that the machine tool motion parameter is carried out data processing comprises: the module of determining cutter each point coordinate figure in working angles, cutter azimuth between the 2 cutter rail points of space in working angles is converted to the module of lathe turning axle one to the four-quadrant corner, and the module of frock error compensation.

The source program of the module that the machine tool motion supplemental characteristic is handled is:

Public Function Calculation_Move (Pntm () As Double, Prejudice_str () As Double, MULTAX As String) As Double () ' some computing module Dim A As Double, K As Long, Move (4) As Double For K=1 To 3 Pntm (K)=Pntm (K)+Prejudice_str (K) Next If MULTAX=" ON " Then A=VrCalculation (Pntm (4), Pntm (5), Pntm (6)) Else A=0＜!--SIPO＜DP n=" 7 "〉--〉＜dp n=" d7 "/End If Move (1)=Pntm (1) Move (2)=(Pntm (2) * Cos (A* (3.14159265358979/180)))-(Pntm (3) * Sin (A* (3.14159265358979/180))) Move (3)=(Pntm (2) * Sin (A* (3.14159265358979/180)))+(Pntm (3) * Cos (A* (3.14159265358979/180))) Move (4)=A* (1)+Prejudice_str (4) Calculation_Move=Move () End Function Public Function AddMove (Movel () As Double; Move2 () As Double) As Double () ' angular transition module Dim i As Long; Move (4) As Double For i=1 To 4 Move (i)=Move1 (i)-Move2 (i) Next If Move1 (4)-Move2 (4)＞180 Then Move (4)=-360+ (Move1 (4)-Move2 (4)) End If If Move1 (4)-Move2 (4)＜-180 Then Move (4)=360+ (Move1 (4)-Move2 (4)) End If AddMove=Move () End Function Public Function VrCalculation (X As Double; Y As Double, Z AsDouble) As Double () ' azimuth calculate Dim Angle (2) As Double ' calculate rotating shaft A If Y＞0 Then If Z＞0 Then ' first quartile Angle (1)=Atn (Y/Z) Angle (1)=Angle (1) * (180/3.14159265358979) End If＜!--SIPO＜DP n="8"〉--〉＜dp n="d8"/〉 If Z＜0 Then′ Angle   (  1  )=Atn   (  Abs   (  Z  )  /Y  )  Angle   (  1  )=Angle   (  1  )  *   (  180/3.14159265358979  )  +90 End If If Z=0 Then′Y Angle   (  1  )=90 End If End If If Y＜0 Then If Z＞0 Then′ Angle   (  1  )=Atn   (  Z/Abs   (  Y  )   )  Angle   (  1  )=Angle   (  1  )  *   (  180/3.14159265358979  )  +270 End If If Z＜0 Then′ Angle   (  1  )=Atn   (  Abs   (  Y  )  /Abs   (  Z  )   )  Angle   (  1  )=Angle   (  1  )  *   (  180/3.14159265358979  )  +180 End If If Z=0 Then′Y Angle   (  1  )=270 End If End If If Y=0 Then If Z＞0 Then′Z Angle   (  1  )=0 End If If Z＜0 Then′Z Angle   (  1  )=180 End If End If MoVe   (  2  )=(  Pntm   (  2  )  *Cos   (  A*   (  3.14159265358979/180  )   )   )-(  Pntm   (  3  )  *Sin   (  A*   (  3.14159265358979/180  )   )   )  Move   (  3  )=(  Pntm   (  2  )  *Sin   (  A*   (  3.14159265358979/180  )   )   )  +   (  Pntm   (  3  )  *Cos   (  A*   (  3.14159265358979/180  )   )   ) ＜!--SIPO＜DP n=" 9 "〉--〉＜dp n=" d9 "/VrCalculation=Angle () End Function

Operating personnel will be transferred to numerically-controlled machine by the nc program that this postposition disposal route is generated, and treat that blade and cutter install, and start lathe and just can process the molded lines of turbine blade by the nc program after handling through postposition.

According to different blade profile geometric parameters, only need to adjust each parameter of manufacturing procedure and selected cutter, generate nc program by rearmounted disposal route provided by the present invention, be transferred to four-axle linked numerical control machine tool again, just can process blade.

What this need emphasize be: the range of application of technical solution provided by the present invention not only comprises homemade four-shaft linkage numerical control machine, and comprise the four-shaft linkage numerical control machine of import, its processing object except that the case of present embodiment, also applicable to other industry, have in the machining by the product of the identical or similar profile of different curvature surface mixed-forming.

Claims (6)

1. a four-axle linked digital controlled processing post processing method generates the tool path data file according to workpiece molded lines feature and manufacturing procedure, and computing machine is handled described tool path data file by carrying out based on the program of order, and its step comprises:

Compile described tool path data file and will be put into the step of storer through the tool path data file of compiling;

Read described behind the tool path data file of compiling from storer:

The machine tool motion parameter is carried out the step of data processing;

Carry out the step that the cutter error compensation data is handled;

The coordinate figure of each point adds the step of absolute/increment size on the Tool in Cutting track;

It is characterized in that: also comprise the step of the dynamic cutting speed of cutter being carried out data processing.

2. four-axle linked digital controlled processing post processing method according to claim 1 is characterized in that: the step that described dynamic cutting speed to cutter is carried out data processing comprises:

Determine the step of cutter distance between the 2 cutter rail points of space in working angles;

Determine the step of cutter vector angle between the 2 cutter rail points of space in working angles;

Determine the step of cutter dynamic cutting speed in working angles.

3. four-axle linked digital controlled processing post processing method according to claim 1, the described step that the machine tool motion parameter is carried out data processing comprises:

Determine the step of each point coordinate figure on the Tool in Cutting track;

Cutter azimuth between the 2 cutter rail points of space in working angles is converted to the step of lathe turning axle one to the four-quadrant corner;

It is characterized in that: the step that also comprises frock error compensation.

4. control system of method according to claim 1, this control system comprises the computer software that is used to handle the tool path data file, described program software comprises the functional module of working in the following order:

Compile described tool path data file and will be put into the module of storer through the tool path data file of compiling;

Read the module of described tool path data file through compiling from storer:

The machine tool motion parameter is carried out the module of data processing;

Carry out the module that the cutter error compensation data is handled;

The coordinate figure of each point adds the module of absolute/increment size on the Tool in Cutting track;

It is characterized in that: also comprise the module of the dynamic cutting speed of cutter being carried out data processing.

5. control system according to claim 4 is characterized in that: the module that described dynamic cutting speed to cutter is carried out data processing comprises:

Determine the module of cutter distance between the 2 cutter rail points of space in working angles;

Determine the module of cutter vector angle between the 2 cutter rail points of space in working angles;

Determine the module of cutter dynamic cutting speed in working angles.

6. control system according to claim 4, the described module that the machine tool motion parameter is carried out data processing comprises:

Determine each point coordinate figure on the Tool in Cutting track module;

Cutter azimuth between the 2 cutter rail points of space in working angles is converted to the module of lathe turning axle one to the four-quadrant corner;

It is characterized in that: the module that also comprises frock error compensation.

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