China Drying Newsletter As of January 1, 2013, the turbine rotor of the urea plant CO2 compressor in Daqing Petrochemical Plant has been running smoothly for 625 days, marking the success of the research on the turbine rotor end-stage and sub-last stage blade breaking project of the CO2 compressor. The transformed blade of this project is the first in China. According to reports, the steam turbine is a complete set of equipment imported from Italy in the early stages of construction. Since the commissioning of the steam turbine, there have been many accidental blade breakages of the last stage and second stage, which severely restricted the long-term operation of the urea plant. It has been learned that similar accidents often occur in other chemical fertilizer companies of the same type, and blade fracture has become a common problem for chemical fertilizer companies. In this regard, the company set up a research team specifically to analyze the causes of blade fracture from multiple angles, and put forward a reform program and implemented it. After two years of operation, the operating parameters and spectrum of the modified urea plant CO2 compressor steam turbine are in full compliance with the technical agreement requirements. It is expected that the modified rotor can be operated normally for 5 to 10 years, and annual economic losses of 4.65 million yuan due to rotor blade fracture can be recovered. A 3-Axis CNC Machining Center/Mill is used for creating various industrial parts. This is achieved by using a wide-range of tooling and cutters depending on the type of material being cut and the end product being manufactured. Vertical Machining Center,Vertical Cnc Machine,Cnc Vertical Machining Center,Vertical Turning Center Jiangsu Hoston Machine Tools Co., Ltd. , https://www.haostonmachinetools.com
A 3-axis CNC Mill works on three separate axes:
X-Axis: Moving longitudinally or [left-to-right"
Y-Axis: Moving laterally or [front-to-back"
Z-Axis: Moving Vertically or [up-and-down"
CNC Vertical Machining Centers can include an additional axis to do specific cutting applications.
Rotary Tables are common as a 4th Axis on mills. They can vary in size and weight capacities and can have a horizontal or vertical configuration. They are generally an add-on to a standard 3-axis mill. The mill will have to have a proper 4th axis interface (generally a 4th axis card, drive and CNC Control) to accept a 4th axis rotary table.
Trunnion Tables can also be an add-on to a vertical CNC Mill. A Trunnion table adds a 4th and 5th axis to a standard mill by incorporating an A-Axis (which rotates around the X-Axis) as well as a C-Axis (which rotates around the Z Axis).
A true 5-axis machine can allow for continuous 5-axis machining simultaneously. This increases both speed and accuracy when machining the part.
CNC Vertical Mills generally have a single spindle, automatic tool changer, work table and CNC Control.
The spindle on a CNC Machining Center can have a wide range of speeds depending on what material is being cut and the depth of cut that is required. Typical spindle speed ranges from 0 to 10,000 RPM. Higher speeds are used for lighter materials including graphite and aluminum among others. Higher speeds can reach 12,000 RPM up to 50,000 RPM and higher.
The Spindle is loaded with tool holders and cutters to achieve the proper material removal. There are many different styles of tool holders including BT and CAT – which have a conical shape as well as HSK, which uses flanges instead of a taper to lock the holder in place. BT and CAT Holders can come in various sizes including 30, 40 and 50 taper depending on the size of tool the cutter requires. HSK (Hollow taper ShanK) comes in a variety of types – A through F – and sizes from HSK-32 up to HSK-160. HSK is considered a better tool holder for high speed machining as there is more surface contact between the spindle and the holder, reducing vibration and keeping the tool from pulling back into the receiver when cutting at high speeds.
A CNC Vertical Machining Center offers different styles of automatic tool changers as well. The most common style is the umbrella-style. This is where the tool holders are loaded into the carousel vertically. The other style is a drum or side-mount style. The tools are loaded in horizontally in this type. This allows for greater part height in the work area and can help accommodate a rotary table, fixture or any additional work holding devices mounted to the table.