The Uni-pro NC90 CNC system is a special CNC system developed by HELLER Machine Tool Company of Germany for crankshaft, camshaft CNC milling machine and car-pulling machine tool produced by HELLER. I have used this system for many years. There are many advantages in programming and operation compared to other CNC systems, which are described in detail here.

2 Numerical control system function description Uni-pro NC90 numerical control system adopts APARM language for programming. APARM programming instructions are simplified based on language words, and different languages ​​and operation interface versions can be converted according to the language of the machine tool. In this way, the operator's memory and operation are greatly facilitated, and the cumbersome G command and M command are avoided.

The Uni-pro NC90 CNC system describes the object to be processed with a polar coordinate system. First, define the shape of the object and give the spatial position of the object. For example, the crankshaft journal of the crankshaft is only described by the spatial angle, eccentricity and radius. For example: BCO1 CIR 30, 55 defines a basic shape with a radius of 30mm and an eccentricity of 55mm.

CON1 = BCO 1 ANG 120, STO 3 defines that the spatial position of the basic shape 1 relative to the machine zero is 120 degrees counterclockwise, and STO 3 represents the one-sided machining allowance of shape 1 is 3 mm.

For the shape of the balanced iron, it is defined according to the polar coordinate system, usually with the center of the main journal as the pole, the apex of the connecting rod journal is zero degrees, and the shape of the balanced iron is described by the angle and the polar radius every 15 degrees. As shown in the figure, in addition to the regular shape, the shape of the machined workpiece can also be described by the above method, such as a camshaft. For a geometric shape requiring a stricter shape such as a camshaft, the angular division interval unit is Need to be in 2 or 3 degrees. The shape of the above figure is described as: BCO 12 POL 0, 100 SPN 15, 97 30, 90 45, 82. .

345, 97. 4 360, 100 With the above description of the geometry, the spatial position of the shape relative to the machine zero is given: CON 12 = BCO 12 ANG 240, STO 1. 0 defines the basic shape 12 relative to the machine tool The spatial position of the zero point is 240 degrees counterclockwise, and STO 1. 0 indicates that the unilateral machining allowance of shape 11 is 1 mm.

When the machine feeds in the cutting, the influence of the shape of the cutting and the contact area of ​​the blade and the workpiece on the load of the cutter head is considered, and the slow feed in the two parts of the above figure is automatically realized, and the feed can be quickly performed in one position.

The system uses the program module to simultaneously process two journals, eg RAP W LHS 811. 0, L1 622, Z LHS 541. 0, C 200 (cutter and center frame quickly moved to the specified position) BOB (machining module Start of the program) STY CLA 1 (center clamp) CYC CON 3, Z LHS 541. 0, PLA 200 POS CON 12 (Z-axis finish machining shape 3, side balance iron shape 12) CYC CON 1, W LHS 811. 0, PLA 200 NEG CON 10 (W axis completes shape 1 machining, side balance iron shape is shape 10) STY UNC 1 (center frame release) EOB (processing module program end) is also set in the system Different cutting amounts in different parts, CHL1, CHL2, CHL3, CHL4, also help to achieve variable speed feed in different parts, which is beneficial to improve processing efficiency. In order to achieve a fast access to the machining target at different positions, the system provides a CLE command, such as: CLE 5 indicates that the cutter blade feeds quickly 5 mm away from the target shape (including machining allowance).

In addition to the main program, the system also provides up to 9 calibration procedures. Calibration procedure 1 is mainly used for calibration of diameter, position, axial dimension and eccentricity, eg CORRECTION PIN I = = = = = = = = = = = = = = = = = = = POC 1 W 0. 00, C 0. 00 LENGHT ANGLE 811. 70 0 FOC 1 CIR - 0. 00, 0. 00 RADIUS 1 2 STROKE 38. 5 67. 5 POC Indicates the correction of the position, including the correction of the axial dimension (W) and the spatial angle (C), and the FOC indicates the correction of the shape, including the correction of the radius (CIR) and the eccentricity.

Such a calibration procedure more specifically describes the correction of the parameters affecting the machining quality of any one of the connecting rod journals, as long as the operator grasps the positive and negative directions of the axes of the machine tool, it is easy to operate. If the axial dimension is 100, in the UNI-PRO90 system, the command is given directly: RAP W 100, the W axis moves to 100, and if there is an offset, it is corrected by the W axis correction value in the POC. More intuitive and easy for the operator to master.

Correction procedure 2 is used for the roundness correction of the machined shape (such as the crankshaft connecting rod journal). Since the machine tool is a circle formed by the two-axis differential compensation, the shape after the difference compensation may be elliptical, and the correction program 2 provides An effective tool for eliminating ellipses.

If the shape of the machine is shown in the actual shape of the curve, the angle radius 0 is subtracted from 0. 045 to - 0. 045 5 0. 002 10 0. 003. .30 0. 007 This point plus 0. 85 becomes 0. 857 60 - 0. 003 This point plus 0. 12 becomes 0. 117. .

The operator can increase the radius at the low point of the shaft diameter profile curve and reduce the radius at the high point. In order to achieve a smooth transition, it is common to increase or decrease the radius at successive points above and below the point.

3 Conclusions (1) Advantages: Because the system adopts a visual programming language and perfect functional configuration, the operator has great flexibility in the realization of programming and processing purposes. It avoids the shortcomings of the traditional G and M instructions and is easy to confuse, and is very user-friendly, easy to operate and understand.

(2) Disadvantages: Since the system is a dedicated system developed by HELLER itself, it is only used on the machine tools produced by HELLER itself, so the production volume is small, resulting in expensive repair parts.

(Finish)

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