CN109358566B

CN109358566B - Four-axis rotary rough cutting method for end mill

Info

Publication number: CN109358566B
Application number: CN201811202037.7A
Authority: CN
Inventors: 汤安胜; 杨一峰; 王建明
Original assignee: AECC Guizhou Honglin Aviation Power Control Technology Co Ltd
Current assignee: AECC Guizhou Honglin Aviation Power Control Technology Co Ltd
Priority date: 2018-10-16
Filing date: 2018-10-16
Publication date: 2021-12-21
Anticipated expiration: 2038-10-16
Also published as: CN109358566A

Abstract

The invention discloses a four-axis rotary rough machining method for an end mill, which comprises the following steps: 1) extracting an outer contour sheet body of the part to be machined based on the machined part model; 2) converting the contour edge of the extracted outer contour sheet body into a curve; 3) spreading the obtained curve along any section of the processed model to make the curve spread on a plane; 4) processing a closed curve area formed by the expansion curve by using an end face milling cutter, and generating a processing tool path track; 5) converting the generated cutter track into points through post-processing, reconstructing a curve through the points, and winding the newly obtained curve to the outer contour of the part to be processed; 6) winding the generated curve to the outer contour of the part to be processed; 7) and generating a final four-axis rotation roughing numerical control program of the end mill by using multi-axis machining and adopting a curve driving mode to perform roughing. The invention has the characteristics of high processing efficiency and simple and stable feed track.

Description

Four-axis rotary rough cutting method for end mill

Technical Field

The invention relates to a part rough machining method, in particular to a four-axis rotary rough machining method for an end mill.

Background

Four-axis machining typically adds a rotating shaft, commonly referred to as the fourth axis. The general machine tool only has three shafts, namely a workpiece platform can move left, right, front, back and forth (1 shaft), and the front and back (2 shafts) of a main shaft tool bit (3 shafts) and is used for cutting a workpiece, and the fourth shaft is that an electric dividing head capable of rotating 360 degrees is additionally arranged on the moving platform, so that inclined holes can be automatically divided and drilled, inclined edges can be milled and the like, and secondary clamping loss precision is not needed.

However, the traditional four-axis rotary machining is rough by using a ball nose cutter, the machining efficiency is low, and the feed trajectory is complex and unstable.

Disclosure of Invention

The invention aims to provide a four-axis rotary rough machining method for an end mill. The invention has the characteristics of high processing efficiency and simple and stable feed track.

The technical scheme of the invention is as follows: a four-axis rotary rough machining method for a face milling cutter comprises the following steps:

1) extracting an outer contour sheet of a part to be processed in a simulation environment;

2) converting the contour edge of the extracted outer contour sheet body into a curve;

3) spreading the obtained curve along any section of the processed model to make the curve spread on a plane;

4) performing simulated machining on a closed area formed by the unfolded curve by using an end face milling cutter to generate a machining tool path track;

5) converting the generated cutter track into points through post-processing, reconstructing a curve through the points, and winding the newly obtained curve to the outer contour of the part to be processed;

6) and generating a final four-axis rotation roughing numerical control program of the end mill by using multi-axis machining and adopting a curve driving mode to perform roughing.

In the four-axis rotation rough machining method for the end mill, in the step 1), the outer contour sheet of the part to be machined is extracted through a curved surface extraction function in the UG modeling tool.

In the four-axis rotation rough machining method for the end mill, in the step 2), the extracted contour edge of the outer contour sheet is converted into a curve through an expansion function in the UG modeling tool, and the obtained curve is on the same plane.

In the four-axis rotation rough machining method for the end mill, in the step 4), a machining tool track is generated through plane milling of a CAM module in a UG modeling tool, the tool step parameter is a plane milling parameter, and the feeding mode is a following part.

In the four-axis rotation rough machining method for the end mill, in step 5), the post-processing is to control the generation point through Motion in a Postprocess in a UG modeling tool, the post-processing output format is X, Y, Z, and after the post-processing is finished, X, Y, Z is not output, and only the corresponding numerical value is processed.

In the four-axis rotation rough machining method for the end mill, in the step 5), a curve is constructed through points in a UG modeling tool, the generated points are fitted to the curve, and then the newly obtained curve is wound to the outer contour of the part to be machined through a winding function in the UG modeling tool.

In the four-axis rotation rough machining method for the end mill, in the step 6), multi-axis machining is selected by using a machining module in a UG modeling tool, a machined rotation center is a central axis of a part, a cutter shaft direction is a central line pointing to the part, a curve is selected as a drive carrier, and a final four-axis machining tool path is produced by using the end mill.

The invention has the beneficial effects that:

according to the machining method, end face milling cutters can be used for four-axis roughing, compared with a ball nose cutter roughing machining method, the machining method is simple and stable in machining, the cutter feeding mode is the same as a plane milling mode, cutter tracks are regular, cutter tracks are generated through plane milling, the generated cutter tracks are converted into curves, the curves are wound on the outer surface of a machined part, finally the cutter tracks are generated through curve driving, machining efficiency is improved, the idea that the traditional four-axis roughing method only can use ball cutters is changed, and therefore the defect of low machining efficiency of the ball cutters is avoided.

Tests prove that the method is actually applied to the machining of parts of the four shafts of the revolving body in the actual machining process of the parts, the machining is stable, and the efficiency is improved by 40-50%.

Drawings

FIG. 1 is a final tool path generation diagram of the present invention;

FIG. 2 is an outline diagram of an extracted processed part and a graph extracted through the outline, which is a basic aid for generating a two-dimensional tool path in the next step, and aims to make the tool path generated by a rotary cutter shaft generated in the next step regular and smooth;

FIG. 3 is a machining tool path generated by developing a curve, the machining tool path must be generated inside the curve to ensure that the tool path is not generated outside the machined part and the part cannot be machined when the tool path is subsequently used as a drive;

fig. 4 is a diagram for converting a tool path into a curve, and is a tool for converting a numerical control program into data by using a UG post processor, wherein the generated numerical control programs are all in an X Y Z format, so that generated points can be completely identified when UG software is converted into a curve, and finally, the format of the generated program NC or MPF program is changed into a DAT format, and then a curve is generated by fitting the curve through the points;

FIG. 5 is a diagram of winding a curve to the surface of a machined part, wherein the winding direction and a reference point are tangent points with the outer contour of the part, and the generated winding curve is used as a driving carrier for generating a four-axis machining tool path in the next step;

FIG. 6 is a diagram of a four-axis roughing tool path formed with the multi-axis machining selected in the machining module, the drive mode and the carrier selected as the curve from the previous step.

Detailed Description

The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention.

Examples of the invention

A four-axis rotary rough machining method for an end mill comprises the following steps:

1) extracting an outer contour sheet body of the part to be machined based on the machined part model through a curved surface extraction function in a UG modeling tool;

2) converting the contour edge of the extracted outer contour sheet body into a curve through an expansion function in a UG modeling tool, wherein the obtained curve is on the same plane;

4) generating a processing cutter track through plane milling of a CAM module in a UG modeling tool, wherein cutter step distance parameters are milling processing parameters according to planes, a feeding mode is a following part, and an end face milling cutter is used for processing a closed curve area formed by an expansion curve;

5) the generated tool path is controlled by Motion in Postprocess in a UG modeling tool to generate points, the points are converted into points through post-processing, then the points are reconstructed into a curve through a function of constructing the curve through the points in the UG modeling tool, the newly obtained curve is wound to the outer contour of a part to be machined through a winding function in the UG modeling tool, the post-processing output format is X, Y, Z, after post-processing is achieved, X, Y, Z is not output, only corresponding numerical values are processed, and the points can be identified when the UG is used for constructing the curve conveniently through point introduction.

6) Generating a final four-axis rotation roughing numerical control program of the end face milling cutter in a curve driving mode to carry out roughing, specifically, selecting multi-axis machining by using a machining module in a UG modeling tool, wherein the machining rotation center is a central axis of a part, the cutter axis direction is a central line pointing to the part, selecting a curve as a driving carrier, and producing a final four-axis machining tool path by using the end face milling cutter.

The application example operates according to the above operation steps, and in the above step 5), the format of the single generation point X Y Z is set through the post process in the UG software, the generated program is processed through the set post process, the customized post process is to control the post process generation point through the Motion in the UG post process, and the post processor is default to be:

changing the tool path into X, Y and Z format, removing the rest needed parameters and auxiliary instructions, finally generating post-processing and storing, and converting the tool path in the step 4) into point format.

The result of the processing has no other auxiliary codes, and the format is as follows:

and after the file is generated, the suffix name of the file suffix NC or MPF is changed into a DAT format, a curve is constructed through passing points in UG, the generated points are fitted into the curve to obtain the curve shown in figure 4, the obtained curve is wound to the outer contour of the machined part through the winding function in UG software, and the obtained curve is used as a cushion in a driving mode for the following four-axis machining.

Claims

1. A four-axis rotary rough machining method for a face milling cutter is characterized by comprising the following steps:

4) performing simulated machining on a closed area formed by the unfolded curve by using an end milling cutter to generate a machining cutter track;

6) generating a final four-axis rotation roughing numerical control program of the end mill by using multi-axis machining and adopting a curve driving mode to perform roughing;

in step 5), the post-processing is to control the generation of points through Motion in Postprocess in the UG modeling tool, change default setting in a post-processor into X, Y, Z format, only process and output corresponding numerical values, and convert the tool path into the point format; in the step 5), a function of constructing a curve through points in the UG modeling tool is adopted, the generated points are fitted into the curve, and then the newly obtained curve is wound to the outer contour of the part to be processed through a winding function in the UG modeling tool.

2. A four-axis rotational roughing method for a face mill as set forth in claim 1, wherein: in the step 1), the outer contour sheet body of the part to be processed is extracted through a curved surface extraction function in the UG modeling tool.

3. A four-axis rotational roughing method for a face mill as set forth in claim 1, wherein: in the step 2), the contour edge of the extracted outer contour sheet body is converted into a curve through an expansion function in the UG modeling tool, and the obtained curve is on the same plane.

4. A four-axis rotational roughing method for a face mill as set forth in claim 1, wherein: in the step 4), a processing cutter track is generated through plane milling of a CAM module in a UG modeling tool, the cutter step parameter is a plane milling processing parameter, and the feeding mode is a following part.

5. A four-axis rotational roughing method for a face mill as set forth in claim 1, wherein: and 6), selecting multi-axis machining by using a machining module in the UG modeling tool, wherein the machining rotation center is the central axis of the part, the cutter shaft direction is the central line pointing to the part, a curve is selected as a driving carrier, and an end mill is used for producing the final four-axis machining tool path.