INVT PLC HMI and Servo Solution for Facing Machine in India

1. Introduction

Facing is a fundamental operation that can be done in two basic ways: facing on a lathe and facing on the milling machine. Milling involves removing material to produce parts with specific features. Facing is the process of removing material from the end and/or shoulder of a work piece, using a special tool to produce a smooth surface perpendicular to the rotational axis of the work piece. When facing, the machinist uses a facing tool to cut a flat surface perpendicular to the work piece’s rotational axis. The facing tool is then fed perpendicularly across the axis. Facing will take the work piece down to its finished length very accurately: depending on how much material needs to be removed, a machinist can choose to take roughing or finishing cuts.

Spindle motors are used the rotation of tools and servo motors are used to carry the tool assembly. First it needs to home the carriage with home sensor with respect to Z- position. Operator mount the job in machine and press the start button then clamp engaged to hold the job then spindle motor start with set rpm then carriage start with rapid speed that is settable to a desired settable length after that machine starts slow feed rate to a settable length in HMI. After achieved the length the carriage is return with reverse speed to rapid stop position and clamp disengaged again operator put the job and engage the job and the process continue till stop button pressed.

The machine part description is as below photo:

2. INVT Solution

According the machine control requirement, the system configuration is as below table:

And the schematic diagram of the control system is as below:

3. System commissioning
According to the control logic and display requirement, PLC and HMI program are made and uploaded to IVC3-3232MAT and VS-070HS. The HMI pages and control panel photos are as below:

And the site control panel is installed as the below photo:

Control cabinet photo

4. Advantages and benefits

* High accuracy with high speed as servo motors are used for rapid and slow feeding.
* Low maintenance and Energy efficient as hydraulic power pack replace by servo motor
* Multiple type of dual facing is possible as inbuilt recipe feature is available in HMI
* Production is high, i.e. 20 jobs per minute.
* IVC3 PLC is having 200khz high speed output with 0.25ms scan time is efficiently control the two servo motor at same time to achieve the facing process.

5. Conclusion
Facing is commonly used in CNC Machine and boring, refers to the process of removing material from the end and/or shoulder of a workpiece, uses a facing tool to produce a flat, smooth surface perpendicular to the rotational axis of the workpiece. Nowadays this application can be possible in PLC, HMI, and Servo with multiple recipe function and INVT successfully replaced the CNC controller. Trouble shoot is easier and Parameters setting is very simple for operator as compare to CNC machine. INVT IVC3 PLC solution is Economical in machine tool sector.