Improvement of profile input mode of the most popu

2022-09-19
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Improvement of profile input mode of indexable screw rotor milling cutter

indexable milling cutter blade is widely used in machine tool, railway, automobile, motor and other mechanical processing industries because of its tangential installation, simple and compact structure, large cemented carbide section in the direction of cutting force, high pressure resistance, and large cutting depth and large tool travel, The domestic indexable screw rotor milling cutter used in the screw compressor rotor processing industry is mainly developed and produced by the numerical control tool factory of Harbin Yigong. The rough machining profile of the screw rotor processed with this milling cutter is uniform and consistent, and the surface roughness is good, so as to ensure the precision of the rotor after finishing, and at the same time, it also saves the finishing cost and other advantages, which has been affirmed by users. This kind of milling cutter has a large market demand

indexable screw rotor milling cutter is a non-standard product with high scientific and technological content. This kind of milling cutter is a special high-efficiency rough milling cutter for processing screw compressor rotor. As shown in Figure 1, this kind of milling cutter is composed of female and male milling cutters, which process the female rotor and male rotor of the screw respectively. When designing the cutter profile, it is necessary to ensure that the profile overlapped by the blade meets the user's tolerance and other requirements, so the input milling cutter profile must be accurate. In the specific design, according to the rotor profile coordinates provided by the user, input the initial tool profile into "AutoCAD" (or "I-DEAS"), and then arrange the blades

profile diagram of female screw rotor milling cutter profile diagram of male screw rotor milling cutter

Figure 1

some coordinate points provided by the user are shown in the table:

604424……2159.................. 161751...

the second column is the X coordinate of the profile, and the third column is the Y coordinate of the profile. The coordinate points of each milling cutter profile are less than 200, and more than 400. Moreover, the profile of milling cutters of different specifications are completely different. Each time a new specification of milling cutter is designed, the milling cutter profile must be input once. Therefore, inputting the profile of screw rotor milling cutter into the design software can also do the zigzag experiment of other specifications of plate and rectangular materials, which is the prerequisite for milling cutter design. The accuracy and efficiency of its input directly affect the next step of tool design

two commonly used methods of profile input

1) manual input

manual input is used. In order to reduce the workload, only some coordinate points can be intercepted by sections, and the X coordinate and Y coordinate of the coordinate points can be used in "AutoCAD" to draw the milling cutter profile with the "multi line" command. This method not only has a large workload, but also is easy to make mistakes

2) input

with the help of "UG" software to carry out the coordinate points provided by the user in "word", retain the X coordinate and Y coordinate, and add Z coordinate, and set each Z coordinate value to 0. Save the good coordinate points in ".Dat" format. Open the "UG" software, enter the "sketch" mode, select the "spline" command, select "through point" - "point in file", select the good file, and generate the milling cutter profile. Then output the generated profile to ".Dwg" or ".Igs" format. Finally, the milling cutter design is carried out in the software "AutoCAD" or "I-DEAS strengthening the supervision of announced enterprises during and after the event". In this way, the output profile is accurate and relatively efficient, but this method can only generate the prototype line of the milling cutter, and the centerline and tolerance zone profile of the milling cutter need to be manually input

improvement of profile input mode

from the above two input modes, we can see that manual input is inefficient and easy to make mistakes; Using "UG" software has certain limitations, and using only this function of "UG" is also a waste of software. Therefore, combined with the actual situation, we use "VBA" in "AutoCAD" to carry out secondary development of "AutoCAD" and develop the functions suitable for research and development. "VBA", as the secondary development tool of "AutoCAD", has the characteristics of simple syntax and powerful functions. The software interface developed in the secondary development is shown in Figure 2

Figure 2 software interface

the coordinate points provided by the user are carried out in "word", only the X coordinate and Y coordinate are retained, and the good coordinate points are saved in ".Txt" format. Run "VBA" in "AutoCAD" and load the software. Set the option of the profile to be output in the software, and click the "OK" button. The generated profile is shown in Figure 3

the profile generated by the software

adopts the prototype line of the milling cutter, and the center line, tolerance zone profile, tool shape line, etc. of the milling cutter can also be input at the same time according to the selection; At the same time, according to the needs, the coordinate points of the NC lathe program of the tool shape line can also be generated. The program is as follows:

...

N12 G01 x205.48 z29.2, which makes the market share of plastic packaging increase correspondingly. 3

N14 G01 x205.35 z29.374

n16 G01 x205.22 z29.561

N18 G01 x205.11 z29.747

through the secondary development of "AutoCAD", the develop the functions suitable for our needs, Give full play to the effectiveness of existing software and avoid the waste of software. After many times of verification of screw rotor milling cutter profile input of different specifications, the secondary development software is flexible and convenient to apply, which greatly improves the efficiency and accuracy of screw rotor milling cutter profile input, and provides a guarantee for the next step of milling cutter design, so as to provide users with high-quality, efficient and satisfactory products faster. (end)

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