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一、Introduction of machine tools
The MMK28 series precision CNC vertical spindle rotary surface grinder is a high-rigidity, CNC servo-controlled precision vertical spindle rotary grinding machine.
Featuring a vertically arranged grinding spindle and a worktable mounted on the upper part of the bed, this machine boasts rational and compact structural design with excellent static/dynamic rigidity and high precision.
Its selected drive system delivers outstanding dynamic performance, employing high-precision, highly reliable actuating components with fast response.
The machine primarily consists of: bed, column, rotary worktable (hydrostatic rotary table), grinding wheel spindle, wheel dresser, cooling system(including filtration unit), protective enclosure, hydraulic system, and electrical control system.
二、 Technical Parameters
Item | Unit | MMK2840NC | MMK2850NC | |
Table diameter | mm | Φ400 | Φ500 | |
Hydrostatic table speed | rpm | 40-140 | ||
Maximum distance from the lower face of the grinding wheel to the table surface | mm | 400 | ||
Back-and-forth motion | Automatic feed | mm/stork | 0.005～12 | |
Motorized speed | m/min | 0.5～1 | ||
Electronic handwheel micro feed | mm/div | 0.005 | ||
Grinding wheel | Grinding wheel size (OD x thickness x ID) | mm | depending on the type of workpiece | |
Spindle frequency conversion speed | rpm | 100-3600 | ||
Vertical motion | Motorized speed | m/min | 0～1 | |
Automatic feed | mm/stork | 0.001～0.05 | ||
Electronic handwheel micro feed | mm/div | 0.001 | ||
Rotary stroke of vertical mill head | rotational stroke | ±30° | ||
Locking method | manual locking | |||
Motor | Spindle motor | kW | 5.5 | |
Hydraulic pump motor | kW | 2.2 | ||
Table rotary motor | kW | 1.5 | ||
Maximum table weight | Kg | 300 | 400 | |
Gross weight (approx.) | kg | 2500 | 3000 | |
三、Machine accuracy
1、Hydrostatic table rotary accuracy:
Radial runout (tested with a datum ball): | ≤0.002mm |
Axial runout (tested with a datum ball): | ≤0.002mm |
2、Rotary accuracy of the grinding wheel spindle:
Vertical grinding wheel spindle axial runout (root) | ≤0.002mm |
Vertical grinding wheel spindle radial runout (root): | ≤0.002mm |
3、Machine coordinate positioning accuracy, repeatable positioning accuracy:
X-axis: | |
Positioning Accuracy（P）： | ≤0.015mm |
Repeat Positioning Accuracy（Ps）： | ≤0.008mm |
Z-axis： | |
Positioning Accuracy（P）： | ≤0.015mm |
Repeat Positioning Accuracy（Ps）： | ≤0.008mm |
4、Surface finish of workpiece Ra≤0.4um
四、Application Cases
一、Introduction of machine tools
The MMK28 series precision CNC vertical spindle rotary surface grinder is a high-rigidity, CNC servo-controlled precision vertical spindle rotary grinding machine.
Featuring a vertically arranged grinding spindle and a worktable mounted on the upper part of the bed, this machine boasts rational and compact structural design with excellent static/dynamic rigidity and high precision.
Its selected drive system delivers outstanding dynamic performance, employing high-precision, highly reliable actuating components with fast response.
The machine primarily consists of: bed, column, rotary worktable (hydrostatic rotary table), grinding wheel spindle, wheel dresser, cooling system(including filtration unit), protective enclosure, hydraulic system, and electrical control system.
二、 Technical Parameters
Item | Unit | MMK2840NC | MMK2850NC | |
Table diameter | mm | Φ400 | Φ500 | |
Hydrostatic table speed | rpm | 40-140 | ||
Maximum distance from the lower face of the grinding wheel to the table surface | mm | 400 | ||
Back-and-forth motion | Automatic feed | mm/stork | 0.005～12 | |
Motorized speed | m/min | 0.5～1 | ||
Electronic handwheel micro feed | mm/div | 0.005 | ||
Grinding wheel | Grinding wheel size (OD x thickness x ID) | mm | depending on the type of workpiece | |
Spindle frequency conversion speed | rpm | 100-3600 | ||
Vertical motion | Motorized speed | m/min | 0～1 | |
Automatic feed | mm/stork | 0.001～0.05 | ||
Electronic handwheel micro feed | mm/div | 0.001 | ||
Rotary stroke of vertical mill head | rotational stroke | ±30° | ||
Locking method | manual locking | |||
Motor | Spindle motor | kW | 5.5 | |
Hydraulic pump motor | kW | 2.2 | ||
Table rotary motor | kW | 1.5 | ||
Maximum table weight | Kg | 300 | 400 | |
Gross weight (approx.) | kg | 2500 | 3000 | |
三、Machine accuracy
1、Hydrostatic table rotary accuracy:
Radial runout (tested with a datum ball): | ≤0.002mm |
Axial runout (tested with a datum ball): | ≤0.002mm |
2、Rotary accuracy of the grinding wheel spindle:
Vertical grinding wheel spindle axial runout (root) | ≤0.002mm |
Vertical grinding wheel spindle radial runout (root): | ≤0.002mm |
3、Machine coordinate positioning accuracy, repeatable positioning accuracy:
X-axis: | |
Positioning Accuracy（P）： | ≤0.015mm |
Repeat Positioning Accuracy（Ps）： | ≤0.008mm |
Z-axis： | |
Positioning Accuracy（P）： | ≤0.015mm |
Repeat Positioning Accuracy（Ps）： | ≤0.008mm |
4、Surface finish of workpiece Ra≤0.4um
四、Application Cases
