CN104308370B

CN104308370B - A kind of circular arc fly-cutting method

Info

Publication number: CN104308370B
Application number: CN201410421630.6A
Authority: CN
Inventors: 周荇; 代田田; 王飞锦
Original assignee: SHANGHAI BOCHU ELECTRONIC TECHNOLOGY Co Ltd
Current assignee: Shanghai Friendess Electronic Technology Co ltd
Priority date: 2014-08-25
Filing date: 2014-08-25
Publication date: 2016-05-11
Anticipated expiration: 2034-08-25
Also published as: CN104308370A

Abstract

The present invention relates to numerical control laser cutter technical field, specifically a kind of circular arc fly-cutting method. A kind of circular arc fly-cutting method, the process software that includes the laser cutting machine of computer control work carries out circular arc cutting, it is characterized in that this cutting method comprises the steps: to open the process software of laser cutting machine; Carry out laser cutting from first circle; First has been justified after laser cutting, and whether judgement next one circle and the position relationship when previous circle, be same direction, is to connect the outer tangent line that is total to find next one circle, otherwise connects the next circle of interior tangent line altogether searching; Generate new cutting track, cut second circle; Cut after second circle, determined whether last circle. Compared with the existing technology, the circle that will cut couples together along tangent line, and whole machining locus is all smoothly connected, and lathe does not almost have large reduction of speed in cutting process, greatly saves time.

Description

A kind of circular arc fly-cutting method

Technical field

The present invention relates to numerical control laser cutter technical field, specifically a kind of circular arc fly-cutting method.

Background technology

In Laser cutting process, be a basic problem to walking of different graphic cutting always. Many circles are cutCut and be wherein to apply a most general example, therefore walking of many circle cuttings seem particularly important industrial.

Traditional cutting is to regard that by justifying multiple figures process as more, and after a figure processes, cutting head needs to closeLaser, on lift, then emptyly move on to the figure top that the next one will be processed, then decline, open laser, start nextThe processing of figure. If figure is a lot, cutting head is lifting frequently. And due to the technique of laser cuttingRequirement, can only, in the situation that motion stops, could carrying out the lifting of cutting head, therefore each figure safelyProcessing rear lathe all needs to decelerate to 0, and cutting head could rise, then accelerates sky and move on to next source of graph,Decelerate to 0, cutting head could decline, and again and again, takes time and effort completely, and makes under the working (machining) efficiency of latheFall.

Summary of the invention

The present invention is for overcoming the deficiencies in the prior art, and the circle that will cut couples together along tangent line, makes whole processingTrack is all smoothly connected, and lathe does not almost have large reduction of speed in cutting process, greatly saves time.

For achieving the above object, design a kind of circular arc fly-cutting method, include the laser of computer control workThe process software of cutting machine carries out circular arc cutting, it is characterized in that this cutting method comprises the steps: that (1) startsProcessing, the process software of unlatching laser cutting machine; (2) carry out laser cutting from first circle; (3) first circleComplete after laser cutting, whether the next circle of judgement and the position relationship of working as previous circle, be same direction, isConnect the next circle of outer tangent line altogether searching, find next circle otherwise be total to tangent line in connecting; (4) generate new cuttingTrack, cuts second circle; (5) having cut after second circle, determined whether last circle, isThe formation route that walks completes cutting work, otherwise continues the next circle of judgement and position relationship when previous circle.

Current circle is to be all counterclockwise clockwise or all with the cut direction of next circle, and employing is outer cuts altogetherLine is connected with next circle.

Current circle is contrary with the cut direction of next circle, and in adopting, tangent line is connected with next circle altogether.

Compared with the existing technology, the circle that will cut couples together along tangent line in the present invention, makes whole machining locus allBe smoothly connected, lathe does not almost have large reduction of speed in cutting process, greatly saves time.

Multiple circles are regarded as to a figure, between two adjacent circles, directly walk and replace sky traditionally to move with tangent lineWalk, because tangential motion, velocity variations is little, and Acceleration and deceleration time is few, so mechanical shock is also little, and cutting effectGood.

Brief description of the drawings

Fig. 1 is program flow diagram of the present invention.

Fig. 2 is that two circles are with counterclockwise, connects the outer tangent line schematic diagram that is total to.

Fig. 3 is that two circles are one counterclockwise another is clockwise, tangent line schematic diagram altogether in connecting.

Detailed description of the invention

The present invention is described further with reference to the accompanying drawings below.

As shown in Figure 1, cutting method of the present invention is a series of circles for object, and cutting method comprises the steps:

(1) start processing, open the process software of laser cutting machine;

(2) carry out laser cutting from first circle, the position of first circle is predefined;

(3) first has been justified after laser cutting, the next circle of judgement and the position relationship of working as previous circle, whetherFor same direction, be to connect the next circle of outer tangent line altogether searching, find next circle otherwise be total to tangent line in connecting,The information that circle comprises is the center of circle, radius and cut direction, and cut direction is predefined;

Judge whether with next circle be all clockwise or counterclockwise:

(a) as shown in Figure 2,, if two circles are to be all counterclockwise clockwise or all, look for the granddad of two circles to cutLine, specific as follows:

If the two round hearts are respectively O₁(x₁,y₁),O₂(x₂,y₂), radius is respectively R₁,R₂, suppose that two circles are all counterclockwiseDirection.

If connecting straight line L and the x axle clamp angle of the two round hearts is β, the point of contact of first circle is P₁, line segment O₁P₁With L'sAngle is designated as α, and two distance of center circle are from being designated as D.

?

D = \sqrt{{(x_{1} - x_{2})}^{2} + {(y_{1} - y_{2})}^{2}}, α = \arccos (\frac{| R_{1} - R_{2} |}{D}) .

Make θ=β-α, the point of contact on two circles is respectively

(x₁+R₁cosθ,y₁+R₁sinθ)，(x₂+R₂cosθ,y₂+R₂sinθ)。

Finally, as long as be exactly outside common tangent these two points with segment link.

(b) as shown in Figure 3, if two one of circles are that another is counterclockwise clockwise, the interior public affairs of looking for two circlesTangent line, specific as follows:

Mark before continuing to use: establish the two round hearts and be respectively O₁(x₁,y₁),O₂(x₂,y₂), radius is respectively R₁,R₂, might as wellSupposing one of two circle, counterclockwise another is clockwise.

?

D = \sqrt{{(x_{1} - x_{2})}^{2} + {(y_{1} - y_{2})}^{2}}, α = \arccos (\frac{| R_{1} + R_{2} |}{D}) .

Make θ=β-α, the point of contact on two circles is respectively

(x₁+R₁cosθ,y₁+R₁sinθ)，(x₂-R₂cosθ,y₂-R₂sinθ)。

Equally, as long as be exactly internal common tangent these two points with segment link.

(4) generate new cutting track, cut second circle;

Using the point of contact of common tangent and first circle as starting point, first circle is first paragraph cutting track, common tangentFor second segment cutting track, within one week, cut as the 3rd section around second circle since the point of contact of second circle and common tangentCut track, second circle repeated to first step process, then the point of contact of the common tangent being connected with a upper circle and with underThe point of contact of the connected common tangent of circle connects with small arc-shaped, as the 4th section of cutting track.

(5) having cut after second circle, determined whether last circle, is to form the route that walks to complete cuttingWork, otherwise the next circle of continuation judgement and the position relationship of working as previous circle.

Claims

1. a circular arc fly-cutting method, the process software that includes the laser cutting machine of computer control work carries out circular arc cutting, it is characterized in that this cutting method comprises the steps: that (1) starts processing, opens the process software of laser cutting machine; (2) carry out laser cutting from first circle; (3) first has been justified after laser cutting, and whether the next circle of judgement and the position relationship of working as previous circle, be same direction, is to connect outside common tangent to find next circle, otherwise connects the next circle of internal common tangent searching; (4) generate new cutting track, cut second circle; (5) having cut after second circle, determined whether last circle, is to form the route that walks to complete cutting work, otherwise the next circle of continuation judgement and the position relationship of working as previous circle; Current circle is to be all counterclockwise clockwise or all with the cut direction of next circle, adopts outside common tangent to be connected with next circle; Current circle is contrary with the cut direction of next circle, adopts internal common tangent to be connected with next circle.