The hottest mastercam80 is processed on a four axi

2022-10-02
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The application and skills of MasterCAM8.0 in the processing of four-axis and five axis milling machines

mastercam8.0 adds a multi axis processing module, but in the actual processing application, the controller of the NC machine tool is different. During post-processing, if the post-processing file suitable for the NC machine tool controller cannot be found in the post-processing folder posts provided by MasterCAM8.0, or after a general post-processing file, If the post-processing file corresponding to the NC machine controller is still not available, the NCI file obtained by the multi axis machining module cannot be converted into the NC program available in the actual machining

in my work practice, through appropriate transformation, some commonly used and typical four-axis and five axis machining can be realized on MasterCAM8.0, and successfully post processed into NC programs suitable for the actual four-axis and five axis CNC milling machine controller format

application of one and four axis machining

NC machining of sanitary napkin cutter forming roll is mainly realized on xk-715m machine tool (three coordinate NC machine tool with rotating shaft) by using flat milling cutter and taper forming cutter. The cutter forming roller clamped on the rotating axis is equivalent to the fourth axis - axis A. the cutter walks a spatial curve on the cylinder to obtain the profile of the blade

then, how to build this space curve rolled on the cylinder

first of all, in MasterCAM8.0, according to the cutter theory, the blade development needs to take multiple measures to improve the system, and draw the unfolding diagram of the center trajectory of different cutters, which is a two-dimensional curve

then, use the conversion of the main menu → drum → serial connection, and select the tool path curve in the way of serial connection → then set the drum diameter, rotation axis X and the position of the curve on the cylinder → confirm that the service conditions of the valve spring are very harsh, and then make a cylindrical surface with the same size as the drum diameter as the guide surface for 4-axis curve processing, and cast the spatial curve on the cylindrical surface in the way of projection for processing

although it is also FANUC system, the format used by xk-715m machine tool and machining center controller is slightly different, so the post-processing file t needs to be modified before using MasterCAM post-processing to generate NC program

the method is as follows: enter the file →→ * PST → find the default t file of the system, make a backup first, such as saving as a t file, and then open it to find the variable rot in the following list_ ccw_ Pos: 1, change it to rot_ ccw_ Pos: 0, and save it

# Rotary Axis Settings

# --------------------------

vmc : 1 #0 = Horizontal Machine, 1 = Vertical Mill

rot_ on_ x: 1 default rotary opens a new era Y axis orientation, see ques 164. #0 = Off, 1 = About X, 2 = About Y, 3 = About Z

rot_ ccw_ Pos: 1 axis signed dir, 0 = CW positive, 1 = CCW positive

then enter the "NC management" menu → change the post-processing file → select the T file, and then post-processing the NCI file to generate the NC format that conforms to the xk-715m machine tool

application of two and five axis machining

taking the machining of the inner shape of the double angle fork on T20 of FIDIA system as an example, it is explained that the five axis machining with fixed angle on T20 is realized with MasterCAM8.0

t20 angles a and B are defined as follows: angle a rotates around the X axis, angle B rotates around the Y axis, angle B is the active angle, and angle a is attached to angle B. The T20 workbench does not rotate, and the cutter head can rotate at angles a and B. During MasterCAM modeling, first of all, determine the actual clamping position of the part (not exceeding the range defined by corners a and b), and the selection of composition surface should be consistent with the actual clamping surface of the part

when machining the inner shape of the fork ear, in fact, the T20 cutter head rotates and fixes the double angles a and B angles, and then takes a tool path similar to the three-axis, but this path is a three-dimensional space line relative to the clamping surface

analyze the final T20 fixed angle five axis Machining NC program, first add the A and B angle information of the cutter head, and then go out of the three-dimensional space line

1. Get the information of a and B angles in MasterCAM 8.0

after building the fork shaped surface according to the above clamping method, first make the normal loss of the surface to be grooved, and then analyze the information of the normal vector on the front composition surface (front view), in which the angle information is the B angle value we require; Then, in the state of 3D composition plane, calculate the angle between the normal vector and the Y axis, and get the value of angle A

2. Get the actual available tool path and NC program in MasterCAM 8.0

first define the surface to be grooved as a new composition surface, such as number 13, store it, and then select the tool plane as 13, and then make the tool path like three-axis machining. The obtained tool path cannot be post processed directly, because it has two angles, and it cannot or may not be post processed into a program format suitable for T20 FIDIA controller. Therefore, only after the tool path is simulated and saved as a geometric graphic element, and then in the state of top composition surface and top tool surface, select the geometric graphic element for "contour" processing. The processing parameters "computer compensation" and "controller compensation" are both selected as "off", and the selection of "tool tip compensation" is consistent with the last tool path. The new tool path obtained in this way is equivalent to the tool path in the original composition surface (t surface) converted by the helper system. After it is put in the general post position, check whether the power of the instrument is sufficient, and then get the NC program that T20 tool head should go after rotating and fixing angles a and B. (end)

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