Specifications

1.MM2120 precision internal grinder
2.Cross liner guideway more efficient
3.easy operation

MM2120 precision internal grinder

  

Features:

 

 

 

* This machine is mainly used for grinding cylindrical and conical hole.

* The spindle of the machine adopts hydrostatic and hydrodynamic bearing with high accuracy, good rigidity and long working life.

* The work table is driven by hydraulic or manual way. It can realize variable speed of grinding and dressing feed.

* The wheel can realize micro automatic feed or manual feed. Its dressing can be realized by the hydraulic handle.

* The wheel head cross movement of GP2120 can be driven by manual or hydraulic way. The feed driving system is composed by two feed driving chains. One is for grindling feed, the other is for adjusting and dressing feed. And they don't interfere each other. In the grinding process, the user neither need to make the hand wheel advance or retreat frequently nor remember the position of the dial. It makes the operation easy and convenient.   

* The work head spindle, wheel spindle, hydraulic pump, coolant pump, hydrostatic and hydrodynamic oil pump are driven by the separate motors.

* The machine is suitable for processing single work piece in small amount with high accuracy. And this process is easy and convenient to handle.

 

The spindle of wheel head:

The wheel spindle adopts the hydrostatic and hydrodynamic bearing with high accuracy, wide speed range and long work life.   

 

The accessories:

Coolant systrem, Wheel balancing bar, Wheel flange, Hydrostatic and hydrodynamic lubrication system, Three-jaw self-centering chuck, Machine wedge

 

Main specification:

Specifcation		Unit	MM2120	MM2150	MM2180
The diameter of grinding inner hole		mm	Φ50-Φ200	Φ150-Φ500	Φ150-Φ800
The max. depth of the grinding hole		mm	120 (while diameter of the grinding hole is 50-80)	350 (while diameter of the grinding hole is 150-250),           450 (while diameter of the grinding hole is 250-500)	350 (while diameter of the grinding hole is 150-250),           450 (while diameter of the grinding hole is 250-800)
			150 (while diameter of the grinding hole is 80-150)
			120 (while diameter of the grinding hole is 150-250)
Max. swivel diameter of work piece	Within cover	mm	400	510	510
	Without cover	mm	600	725	1025
Max. travel of work table		mm	600	725	725
Distance from spindle center to bottom of the bed		mm	1210	1200	1350
Max. swivel angle of the work head			30°	20° (with three-jaw chuck)	20° (with three-jaw chuck)
				15° (with face plate)	15° (with face plate)
Max. cross travel of the work head		mm	250	250	250
Max. cross travel of the wheel		mm	70	100	100
Work piece turning speed		r/min	100-500	25-350	25-350
Wheel turning speed		r/min	4000, 5000, 6000, 8000, 11000	1450, 4200	1450, 4200
Speed of table movement	Dressing speed	m/min	0.1-2	0.2-1	0.2-1
	Grinding speed	m/min	1.5-6	1-4	1-4
Work table movement as per round of the hand wheel		mm	12	1.083 (connect with planet gears)	1.083 (connect with planet gears)
				16 (disconnect with planet gears)	16 (disconnect with planet gears)
Total power		kw	9.3	10.5	10.5
Machine dimension		mm	3100x2130x1320	3760x1660x1650	3760x1600x1800
Machine weight		kg	3500	4500	4700

 

Machining accuracy:

Item	Unit	MM2120	MM2150	MM2180
Roundness	μm	3/1.5	3/1.5	3/1.5
Cylindricity	μm	5/3	5/3	5/3
Roughness	μm	0.40/0.16	0.40/0.16	0.40/0.16