After casting, the grey cast iron parts are usually needed to be machined by CNC machines or machining centers. At RMC we can do them all by our own machining facilities with high precision accuracy. Also called precision machining, the CNC machining could reach a very high accuracy in geometical tolerance and dimensional tolerance. With our CNC machines and Horizontal Machining Centers (HMC) and Vertical Machining Centers (VMC), we can almost meet all of your required tolerance grades. We can strictly follow the tolerances you require for each dimension or according to the standard of ISO 2768.
CNC Precision Machining Capabilities
Size Range (mm)
Vertical Machining Center (VMC)
1,500 × 1,000 × 800
6,000 tonn or 300,000 pieces
Horizontal Machining Center (VMC)
1,200 × 800 × 600
2,000 tons or 100,000 pieces
Max turning φ600
5,000 tons or 600,000 pieces
Standard of Tolerance: ISO 8062 2013, ISO 2768, GOST 26645 (Russia) or GBT 6414 (China).
The machining center is developed from the CNC milling machine. The biggest difference from the CNC milling machine is that the machining center has the ability to automatically exchange machining tools. By installing tools for different purposes on the tool magazine, the machining tools on the spindle can be changed by the automatic tool changer in one clamping to realize multiple machining features.
The CNC machining center is a high-efficiency automated machine tool that is composed of mechanical equipment and a CNC system and is suitable for processing complex parts. The CNC machining center is currently one of the most widely used CNC machine tools in the world with strong comprehensive processing ability. It can complete more processing content after the workpiece is clamped at one time. The processing accuracy is high. For batch workpieces with medium processing difficulty, its efficiency is 5-10 times that of ordinary equipment, especially it can complete Many processings that cannot be completed by ordinary equipment are more suitable for single-piece processing with more complex shapes and high precision requirements or for small and medium batch production of multiple varieties. It concentrates the functions of milling, boring, drilling, tapping and cutting threads on one device, so that it has a variety of technological means.
Machining centers are classified into horizontal and vertical machining centers according to their spatial position during spindle machining. Classified according to process use: boring and milling machining center, compound machining center. According to the special classification of functions, there are: single workbench, double workbench and multi-workbench machining center. Machining centers with single-axis, dual-axis, three-axis, four-axis, five-axis and interchangeable headstocks, etc.
▶ Equipment for Precision Machining Components:
|Mechanical Properties of Gray Cast Iron|
|Item according to DIN EN 1561||Measure||Unit||EN-GJL-150||EN-GJL-200||EN-GJL-250||EN-GJL-300||EN-GJL-350|
|EN-JL 1020||EN-JL 1030||EN-JL 1040||EN-JL 1050||EN-JL 1060|
|0.1% Yield Strength||Rp0,1||MPA||98-165||130-195||165-228||195-260||228-285|
|Elongation Strength||A||%||0,3 – 0,8||0,3 – 0,8||0,3 – 0,8||0,3 – 0,8||0,3 – 0,8|
|0,1% Compressive Strength||σd0,1||MPa||195||260||325||390||455|
|Modules of elasticity||E||GPa||78 – 103||88 – 113||103 – 118||108 – 137||123 – 143|
|Brinell hardness||HB||160 – 190||180 – 220||190 – 230||200 – 240||210 – 250|
|Tension and pressure change||σzdW||MPa||40||50||60||75||85|