What Is A Universal Milling Machine

Ⅰ. What is a Universal Milling Machine? What's the difference between it and an ordinary milling machine?

To explain the universal milling machine clearly, we must first start with the basic principle of the milling machine. A milling machine is a type of machine tool that uses a rotating milling cutter to perform cutting operations on a workpiece fixed on a worktable. Different from lathes that can only turn outer circles, milling machines can process planes, grooves, and curved surfaces. It is one of the most widely used types of equipment in mechanical processing.

The worktable of a common lifting table milling machine can only make linear feed along the longitudinal and transverse directions. Combined with the vertical movement of the lifting table, it can only complete conventional planar groove processing. The most significant difference of the universal milling machine is that, on the basis of the ordinary lifting table milling machine, a rotatable turntable is added to the longitudinal worktable - this turntable enables the worktable to rotate up to 45 degrees to the left or right in the horizontal plane. Combined with special accessories such as dividing heads, universal milling heads, and circular worktables, it can process complex shapes that ordinary milling machines cannot handle. Therefore, it is named "Universal Milling Machine".

It is precisely because of the design of this rotatable worktable that the universal milling machine has a processing range far exceeding that of ordinary milling machines, and can almost complete the cutting processing of the vast majority of small and medium-sized parts. The name "universal" thus spread.

Ⅱ. Where exactly does the "versatility" of the universal milling machine lie?

Many people are curious: Isn't it just an extra rotatable workbench? How can it be called "omnipotent"? In fact, it is precisely this tiny rotating function that enables the universal milling machine to unlock many processing scenarios that ordinary milling machines cannot handle:

1. Proficient in conventional processing and stable in basic tasks

For the most common flat surfaces, step surfaces, and various groove processing, such as the reference surface of parts, keyways of motor shafts, and dovetail grooves of machine tool guides, universal milling machines handle them with ease. Their precision and processing efficiency can meet the requirements of the vast majority of industries, and they are suitable for both mass production and single-piece processing.

2. Complex shapes can be handled, and spiral grooves are a specialty

The spiral grooves that cannot be processed by ordinary milling machines are precisely the most classic application scenarios of universal milling machines. The helical grooves for chip removal on the blade of the twist drill bit we commonly use were first processed on a universal milling machine - in 1862, the world's first universal milling machine was born, specifically for milling the helical grooves of twist drill bits. Load the workpiece onto the dividing head, then rotate the worktable to the corresponding helix Angle. With the longitudinal feed of the worktable and the synchronous rotation of the dividing head, a helical groove with qualified precision can be processed. Even the helical structure of workpieces such as machine tool lead screws and milling cutter bodies can be easily completed.

In addition to helical grooves, universal milling machines can also process various inclined surfaces, inclined holes, arc-shaped curved surfaces, and even straight and helical gears. As long as they are equipped with corresponding forming milling cutters and accessories, small-batch gear processing does not require dedicated gear machines and can be completed by universal milling machines. For single-piece and small-batch production, the cost advantage is very obvious.

3. It has strong accessory expansion capabilities, can be used for multiple purposes with one machine and saves costs

The universal milling machine has very strong expandability. As long as different accessories are installed, it can be transformed into processing equipment with different functions: after installing the universal milling head, the spindle can be adjusted to any Angle to process inclined surfaces and inclined holes in different directions. By installing a circular worktable, circular workpieces and arc-shaped contours can be processed. By installing a dividing head, splines, sprockets and polyhedral parts can be processed. If upgraded to a CNC dividing head and a CNC rotary table, it can also achieve multi-axis linkage processing and complete the processing of more complex parts. For many small-scale processing plants, a universal milling machine can meet most processing demands, eliminating the need to purchase multiple specialized devices and significantly reducing production costs.

Ⅲ. For daily use of universal milling machines, these maintenance points must be kept in mind

Universal milling machines have a sturdy structure and a long service life. However, if they are not properly maintained on a daily basis, they are prone to problems such as reduced precision and accelerated wear. By doing these things well, the service life of the equipment can be prolonged: First, daily cleaning must be thorough After each processing is completed, the chips and oil stains on the worktable, guide rails and lead screws should be cleaned in time. The filter felt should be disassembled and washed regularly to prevent chips from scratching the surface of the guide rails. Second, lubrication cannot be neglected: Before starting the machine every day, check whether all oil holes are unobstructed, add lubricating oil to the guide rails, lead screws and sliding surfaces, and regularly check the oil level of the gearbox to ensure that the lubricating oil is at the specified elevation position. Third, regularly check and tighten: Vibrations during processing can cause screws to loosen. Regularly inspect the fixing screws of the pressure plate, insert strips, and transmission mechanism. If any loosening is found, tighten them promptly to prevent processing accidents caused by loose parts. Fourth, take good rust prevention measures: For machine tools that have been out of use for a long time, the exposed parts such as the guide rails, lead screws and handwheels that are prone to rust should be cleaned thoroughly and coated with anti-rust oil to prevent rust from affecting accuracy.

In terms of safe operation, there are several key points that must be noted: when loading and unloading workpieces, the cutting tools must be moved away, and the head and hands must not approach the milling surface during the cutting process. When advancing or retreating the knife quickly, pay attention to the position of the handle to prevent it from rotating and injuring people. When adjusting the cutting tool, measuring the workpiece or changing the speed change, the machine must be stopped first to prevent safety accidents. One chuck can only hold one workpiece at a time. Clamping multiple workpieces is prone to sliding, which may cause the workpiece to fly out and injure people.