CN103949701B - Based on the irregular part milling method of rotating vector - Google Patents

Abstract

The invention discloses a kind of irregular part milling method based on rotating vector, utilize signal analysis technology, by the spectrum analysis to processing parts outline closed curve, according to the work of the trajectory parameters controlled working mechanism of rotating vector superposition.Method of the present invention, based on the Milling Process mechanism that rotating vector is arranged, for the processing of some irregular parts, improve working (machining) efficiency, reduce processing cost, machining accuracy is high, is applicable to the processing of small lot irregular part, the shift design of organisation of working can be carried out for different part outer contours, there is certain versatility.

Description

Based on the irregular part milling method of rotating vector

Technical field

The invention belongs to Machining Technology field, relate to a kind of irregular part milling method based on rotating vector.

Background technology

The special-shaped plate-like class part of tradition generally adopts numerical control mill or Linear cut mode, carries out Milling Process, in order to improve precision, very high to the requirement of Digit Control Machine Tool, significantly increase equipment cost, and working (machining) efficiency is lower.

Summary of the invention

The object of this invention is to provide a kind of irregular part milling method based on rotating vector, solve existing processing method equipment cost high, the problem that working (machining) efficiency is low.

The technical solution adopted in the present invention is, a kind of irregular part milling method based on rotating vector, by the spectrum analysis to processing parts outline closed curve, obtain rotating vector superposition trajectory parameters, then superpose the work of trajectory parameters controlled working mechanism according to rotating vector.

The invention has the beneficial effects as follows, compared with common digital control processing: 1) based on the Milling Process mechanism that rotating vector is arranged, for the processing of some irregular parts, improve working (machining) efficiency, reduce processing cost, machining accuracy is high, is applicable to the processing of small lot irregular part.2) based on the preparation method of the milling machine tool of rotating vector, the 2D signal Fourier of signal is utilized to change, plane closed curve can be decomposed into the superposition of multiple rotating vector, utilize this principle, the boundary curve of irregular part can be decomposed into the superposition of multiple rotating vector, by controlling the rotating speed of each rotating vector and size and initial phase, the speed controlling rotary motion is eaily, the shift design of organisation of working can be carried out for different part outer contours, there is certain versatility.

Accompanying drawing explanation

Fig. 1 is the closed curve rotating vector decomposition principle schematic diagram that the inventive method adopts;

Fig. 2 is the Two Dimensional Rotating vector Milling Process mechanism structure schematic diagram that the inventive method adopts;

Fig. 3 is the structural representation of the inventive method embodiment special-shaped discoid part to be processed.

In figure, 1. part section bar, 2. workpiece electric rotating machine, 3. milling cutter electro spindle, 4. knife rest electric rotating machine, 5. bed piece.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.

With reference to Fig. 1, it is the irregular part milling method that the present invention is based on rotating vector, the closed curve rotating vector decomposition principle adopted, employing complex vector represents the position a little in two dimensional surface, setting f (t) is a closed curve gone round and begun again planar, and plane inner sealing curve f (t) can be write as the complex function that take t as independent variable:

F (t)=x (t)+iy (t), wherein, X (t) is the projection of f (t) on real axis; T (t) is the projection of f (t) in the imaginary axis; then f (t) is launched into Fourier space form by following formula:

$f\left(t\right)={\mathrm{\Σ}}_{n=-\∞}^{\∞}{C}_n{e}^{\mathrm{in}{\mathrm{\ω}}_{0}t}(n=0,\±1,\±2,......),$ ω wherein ₀fundamental frequency, i.e. the angular speed of main shaft, C _nbe a plural number, write as

According to the general principle that signal spectrum is analyzed, the closed curve in plane always can be decomposed into the superposition of multiple circular motion and rotating vector, and the angular speed of these circular motion is n ω ₀, during n > 0 and main shaft rotate in the same way, then reverse during n < 0; represent amplitude and the initial phase of rotating vector, radius is r _nthe i.e. amplitude of rotating vector, initial phase angle is

Utilizing this above-mentioned principle, for some special-shaped disk-like accessories, by extracting part outer contour, carrying out closed curve analysis of spectrum, the thinking design processing method then utilizing rotating vector to superpose.The rotating vector that following table 1 gives three class discoid part circumference lines decomposes.

The rotating vector of table 1, three class discoid part circumference lines decomposes contrast

With reference to Fig. 2, the Two Dimensional Rotating vector Milling Process mechanism structure that the inventive method relies on is, comprise the knife rest electric rotating machine 4(rotating vector 2 being fixedly mounted on the upper and lower table top of bed piece 5 respectively) and workpiece electric rotating machine 2(rotating vector 1), the main shaft of workpiece electric rotating machine 2 is provided with the part section bar 1 treating Milling Process, knife rest electric rotating machine 4 is connected with milling cutter electro spindle 3 by swinging mounting, the axle head of milling cutter electro spindle 3 is provided with milling cutter, for carrying out Milling Process to part section bar 1; Workpiece electric rotating machine 2 is connected with electric control system with knife rest electric rotating machine 4, accepts the unified control coordinated.

Workpiece electric rotating machine 2 for drive part section bar 1 rotate realize equipment rotating vector 1(and one dimension rotating vector) rotation; Knife rest electric rotating machine 4, for driving the rotation of milling cutter, realizes equipment rotating vector 2(and Two Dimensional Rotating vector) rotation.Distance R1 between the center line of workpiece electric rotating machine 2 and the center line of knife rest electric rotating machine 4 is the amplitude of one dimension rotating vector; Distance R2 between the center line of knife rest electric rotating machine 4 and the center line of milling cutter is the amplitude of Two Dimensional Rotating vector.

Irregular part milling method based on rotating vector of the present invention, utilize signal analysis technology, by the spectrum analysis to processing parts outline closed curve, obtain rotating vector superposition trajectory parameters, again according to the work of rotating vector superposition trajectory parameters controlled working mechanism, specifically implement according to following steps:

Step 1: the outline curve extracting the plate-like class part needing processing:

Step 2: rotating vector spectrum analysis is carried out to the outline closed curve of this plate-like class part, is decomposed into Two Dimensional Rotating vector, and calculate the parameter of each rotating vector;

Step 3: the rotating vector parameter obtained according to spectrum analysis, the structural parameters of setting Milling Process mechanism, comprise structural parameters R ₁and R ₂, controling parameters workpiece electric rotating machine 2 and knife rest electric rotating machine 4 rotating speed w ₁and w ₂, and the initial phase φ of two motors ₁and φ ₂;

Step 4: the outline of working plate-like class part, controls the phase place of two rotating vectors by the time difference controlling two electric motor startings two electric machine rotations realize the superposition action of Two Dimensional Rotating vector, and the track of milling cutter is the outline of processing parts, adopt electro spindle to realize Milling Process part outer contour by milling cutter.

Embodiment

With reference to Fig. 3, the present invention processes a kind of special-shaped plate-like class part embodiment, and the spectrum analysis of this part outer contour f (t) is: $f\left(t\right)={6e}^{i\&CenterDot;(2\mathrm{\&pi;t}+\frac{1}{4}\mathrm{\&pi;})}+e^{i\&CenterDot;(12\mathrm{\&pi;t}+\frac{2}{3}\mathrm{\&pi;})},$ The blockade line of this part outline is decomposed into two rotating vectors, each vector parameters is respectively with reference to shown in following table 1:

Table 1, Fig. 3 embodiment decompose each vector parameters of latter two rotating vector

Utilize above-mentioned discoid part spectrum analysis setting parameter as the Milling Process mechanism structure parameter of Fig. 2, the crossbeam of lathe bed 5 mounting tool post electric rotating machine 4 has bar shaped installing hole, can the installation site of follow rest electric rotating machine 4, thus realize first rotation amplitude R ₁; The position of milling cutter electro spindle 3 on swinging mounting can axially adjust, to realize the second rotation amplitude R ₂.Workpiece electric rotating machine 2 is adjusted by electric control system with the rotating speed of knife rest electric rotating machine 4; Initial phase is then by difference adjustment running time of control two motors.

Claims (1)

1. the irregular part milling method based on rotating vector, it is characterized in that: by the spectrum analysis to processing parts outline closed curve, obtain rotating vector superposition trajectory parameters, then superpose the work of trajectory parameters controlled working mechanism according to rotating vector

The device that the method relies on is, comprise the knife rest electric rotating machine (4) and workpiece electric rotating machine (2) that are fixedly mounted on bed piece (5) upper and lower table top respectively, the main shaft of workpiece electric rotating machine (2) is provided with the part section bar (1) treating Milling Process, knife rest electric rotating machine (4) is connected with milling cutter electro spindle (3) by swinging mounting, the axle head of milling cutter electro spindle (3) is provided with milling cutter, workpiece electric rotating machine (2) is connected with electric control system with knife rest electric rotating machine (4)

Depend on above-mentioned device, the method is specifically implemented according to following steps:

Step 1: the outline curve extracting the plate-like class part needing processing:

Step 2: rotating vector spectrum analysis is carried out to the outline closed curve of this plate-like class part, is decomposed into Two Dimensional Rotating vector, and calculate the parameter of each rotating vector;

Step 3: the rotating vector parameter obtained according to spectrum analysis, the structural parameters of setting Milling Process mechanism, comprise structural parameters R ₁and R ₂, controling parameters workpiece electric rotating machine (2) and knife rest electric rotating machine (4) rotating speed w ₁and w ₂, and the initial phase φ of two motors ₁and φ ₂parameter R1 is the distance between the center line of workpiece electric rotating machine (2) and the center line of knife rest electric rotating machine (4), and parameter R2 is the distance between the center line of knife rest electric rotating machine (4) and the center line of milling cutter;

Step 4: the outline of working plate-like class part, controls the phase place of two rotating vectors by the time difference controlling two electric motor startings two electric machine rotations realize the superposition action of Two Dimensional Rotating vector, and the track of milling cutter is the outline of processing parts, adopt electro spindle to realize Milling Process part outer contour by milling cutter.