Milling Worker Internship Log

The two-week practical training for milling has come to a successful conclusion. This internship was carried out in the school's mechanical training workshop. I systematically got to know and studied the basic structure, operating principles, processing technologies of horizontal milling machines and vertical milling machines, as well as workshop safety regulations. From being unfamiliar and nervous about milling equipment at the very beginning to being able to independently complete the milling of simple planes, steps and groove workpieces, my mechanical operation ability, process thinking and awareness of safe production have been greatly improved. This training allowed me to step out of textbooks and engage in practical operations, and I deeply realized the rigorous, meticulous and pragmatic professional characteristics of the mechanical processing industry. I summarize the internship content and experience as follows.

At the initial stage of the internship, teachers first carried out safety production education and training for milling workers, which was the first and most important lesson of mechanical processing training. The teacher explained in detail the rules and regulations of the milling workshop, forbidden dangerous operations, requirements for wearing labor protection articles and disposal methods for sudden accidents. I learned that milling involves high-speed cutting operations. The spindle of the milling machine rotates fast and the milling cutter is sharp. Iron filings, vibration and noise will be generated during processing. Carelessness may easily lead to safety accidents such as scratches, collisions and clothes being rolled into the machine. Therefore, it is mandatory to wear work clothes and anti-smashing shoes when entering the workshop. Wearing jewelry and letting long hair exposed are prohibited. It is not allowed to hold workpieces by hand or stride over running equipment during operation. Special brushes must be used to clean iron filings after shutdown, and direct contact by hand is strictly forbidden. Through safety training, I completely abandoned fluke mentality and established the processing philosophy of "safety first, prevention first", laying a solid safety foundation for subsequent practical operations.

After the safety training, we started to learn about milling machine equipment, as well as its basic structure and working principles. Vertical knee-type milling machines, one of the most widely used equipment in mechanical processing, were mainly adopted in this training. The teacher explained the core components of the milling machine one by one, including the spindle, spindle gearbox, feed gearbox, lifting worktable, cross slide, longitudinal worktable, handwheel, dial gauge, cooling system and lubrication system. I fully grasped the functions of each component: the spindle clamps the milling cutter and provides high-speed rotating power; the gearbox adjusts the spindle speed and feed rate; the three-axis worktable realizes the movement of workpieces in longitudinal, horizontal and vertical directions to precisely control the cutting position and depth. Meanwhile, I distinguished the core differences between milling machines and lathes: lathes rotate workpieces with fixed tools, while milling machines rotate cutters at high speed with workpieces fed steadily. Milling machines are suitable for processing planes, grooves, steps, gears, keyways and other complex shapes with a wider range of applications.

With solid theoretical knowledge, we moved on to basic practical training, starting with no-load operation of the milling machine and reading control of dial gauges. Accurate control of feed rate is the core skill for milling workers. Each small grid on the handwheel dial of the milling machine corresponds to a fixed moving distance. The handwheel must be turned evenly, slowly and accurately, and reckless shaking, rapid feeding and overtravel operations are forbidden. At first, I was not proficient in handwheel control, prone to excessive feed and position deviation, resulting in benchmark errors of workpieces. After repeated practice, I gradually mastered the operation rhythm, learned to read data accurately and control cutting depth according to machining allowance, and skillfully completed precise three-axis positioning of the worktable, greatly improving the stability and accuracy of operation.

After mastering basic operations, we officially carried out milling training on workpieces, focusing on three fundamental processing technologies: plane milling, step milling and right-angle groove milling. Before processing, I strictly followed the technological process. First, I inspected the dimension of blank workpieces and removed surface oxide scale. Then I placed the workpiece into a bench vice on the worktable, leveled the workpiece and clamped it evenly to ensure no loosening or offset during processing. After clamping, a suitable end milling cutter and spindle speed were selected according to the workpiece material and processing requirements. Low rotating speed and large feed rate were adopted in rough machining to remove excess allowance, while higher rotating speed and smaller feed rate were used in finish machining to guarantee the surface finish of workpieces.

Plane milling is the most basic working procedure, aiming to flatten the uneven surface of blanks and ensure the flatness of the reference plane. During my first milling practice, uneven milling lines and tool joint marks appeared on the surface. Under the teacher's guidance, I found that the problems were caused by unstable feed speed and inaccurate tool setting. In subsequent operations, I completed precise tool setting in advance, maintained uniform feeding, reasonably controlled cutting depth and conducted multiple shallow cutting passes, which effectively improved the surface quality of workpieces. In the practice of step and groove milling, I mastered the processing idea of layered cutting to avoid excessive one-time cutting depth that would cause cutter wear, workpiece deformation and burrs generated by tool chatter. After processing, I measured the length, width and depth of workpieces with calipers and straight rulers, compared the data with tolerance requirements on drawings, and repeatedly corrected machining errors. I gradu

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