What measures should be taken during high-speed machining

In high-speed cutting, in order to maintain a basic constant feed rate per tooth of the tool, the feed rate must also be significantly increased as the spindle speed increases. At present, the feed rate of high-speed cutting has reached 50m/min to 120m/min. To achieve and accurately control such a high feed rate, new requirements have been put forward for machine tool guides, ball screws, servo systems, worktable structures, etc.

Moreover, due to the generally short linear motion stroke on machine tools, high-speed machining machines must achieve higher feed acceleration and deceleration in order to be meaningful. In order to meet the requirements of high-speed feed motion, the following methods are mainly used on high-speed machining machines:

1. Adopting a new type of linear rolling guide, the contact area between the ball bearing and the steel guide in the linear rolling guide is very small, and its friction coefficient is only about 1/20 of that of the groove guide. Moreover, after using the linear rolling guide, the "crawling" phenomenon can be greatly reduced.

2. The high-speed feed mechanism adopts small pitch large-sized high-quality ball screws or coarse pitch multi head ball screws, with the aim of achieving high feed speed and feed acceleration/deceleration without reducing accuracy.

3. The high-speed feed servo system has developed into digitalization, intelligence, and software. High speed cutting machine tools have begun to adopt

Fully digital AC servo motor and control technology.

4. In order to minimize the weight of the workbench without losing stiffness, high-speed feed mechanisms usually use carbon fiber reinforced composite materials.

5. To improve the feed rate, more advanced and high-speed linear motors have been developed. Linear motors eliminate problems such as clearance and elastic deformation in mechanical transmission systems, reduce transmission friction, and have almost no reverse clearance.

Linear motors have high acceleration and deceleration characteristics, with an acceleration of up to 2g, which is 10 to 20 times that of traditional driving devices. The feed rate is 4 to 5 times that of traditional driving devices. Using a linear motor drive, it has obvious advantages such as large thrust per unit area, easy high-speed motion, and no need for mechanical structure maintenance.

5052 h32