Centerless Grinding Machine-FX-20CNC

• After-sales Service: 1 Year
• Warranty: 1 Year
• Type: Centerless Grinding Machine
• Processing Object: Thread
• Abrasives: Grinding Wheel
• Controlling Mode: CNC
• Model NO.: FX-20CNC
• Automatic Grade: Automatic
• Cylindrical Grinder Type: Plunge Cylindrical Grinder
• Precision: High Precision
• Certification: CE
• Condition: New
• Processing Range of Standard Models (Dia: 1-80mm
• Grinding Wheel Size: 510*(205-305)*254
• Adjusting Wheel Size: 305*(205-305)*127
• Grinding Wheel Speed: 1470rpm
• Linear Speed of Grinding Wheel: 45m/S
• Adjusting Wheel Speed: 0-250rpm
• The Grinding Wheel Drives The Motor: 18.5kw
• Adjusting Wheel Servo Motor: 3kw
• Transport Package: Wooden Box
• Trademark: Hotman
• Origin: China
• Production Capacity: 500

Product Description

  1. Technical parameter:

Project	Unit	Model:FX-20CNC-3
Processing range of standard models (diameter)	mm	Φ 1-80
Grinding wheel size (OD * W * OD)	mm	Φ510*(205-305)*Φ254
Adjusting wheel size (OD * W * OD)	mm	Φ305*(205-305)*Φ127
Grinding wheel speed	RPM	1470
Linear speed of grinding wheel	m/s	45
Adjusting wheel speed	RPM	0-250
The grinding wheel drives the motor	KW	18.5
Adjusting wheel servo motor	KW	3
Feed servo motor	KW	3.9
Sand repair servo motor	KW	1.0*2
The hydraulic pump drives the motor	KW	0.75
The cooling pump drives the motor	KW	0.75
Adjusting wheel feed hand wheel	mm	3.5/ RPM 0.05/ scale
Adjusting wheel fine tuning hand wheel	mm	0.1/ RPM  0.001/ scale
Worktable feed hand wheel	mm	The servo feed minimum set weight is 0.0005mm
Worktable micro adjustment hand wheel	mm	0.2/ turn 0.001/ scale
Trim feed hand wheel	mm	2mm/ turn 0.01mm/ scale
Adjust wheel tilt Angle	Deg	+5°~-3°
Adjust the rotation Angle	Deg	±5°
Machine  size (length * width * height)	mm	2800×2100×2000
Mechanical weight	KG	About 4500

2. Standard accuracy of machine tool:
     After the centerless grinder grinding (through grinding) of Hotman Company, the following standard accuracy requirements must be met: (Different grinding wheels should be used for different materials).

No.	Grinding mode	Work piece size (MM)	Flatness	parallelism
1.	Through grinding	Standard sample	≤0.001mm	≤Ra0.1
2.	Entry grinding(press grinding)	Standard sample	≤0.002mm	≤Ra0.2

  Note: Rough grinding (generally grinding amount 0.05~0.20mm); Fine grinding (generally 0.005~0.02mm)
3.  Device description:
(1) Ontology:
    The body and components are cast with high-grade cast iron FC-30, which is artificially normalized heat treatment and then subjected to natural aging treatment. Component processing adopts YASDA, MITSUI SEIKI, TOSHIBA, ELB and other world-class equipment for one-time clamping processing, precision size up to micron level, to ensure the high precision of the basic components of the equipment.

(2) Spindle system:
    The spindle adopts Perrin bearing type spindle with double support structure before and after. High rigidity, high speed, stable operation, the main shaft is SNCM-21H alloy steel, after tempering, carburizing heat treatment and then computer controlled cryogenic treatment, its surface hardness up to HRC-62° above, single effective hardening layer up to 1.5mm above, independent lubrication and heat, beating less than 0.002mm
(3) Adjust the wheel drive system:
    Adjusting wheel spindle drive adopts servo motor, speed control 0-250rpm(digital control) can be arbitrarily set speed, adjust to the best linear speed, when adjusting wheel diameter changes still can maintain the same linear speed, grinding out the best product.
    The servo motor is cleverly designed and installed on the adjusting wheel box and directly driven by the synchronous belt. It can hit the tilt Angle with the adjusting wheel at the same time during grinding to ensure that the two belt wheels are always parallel. It overcomes many adverse effects caused by inertia loss and chain Angle caused by chain multi-segment transmission of old centerless grinder. And eliminates the need to constantly change chains and zipper springs.
(4) Sand repair system:
    The cross structure two-axis servo automatic sand repair system is adopted, and the two axes interlocking sand repair is realized through the numerical control system, and the workpiece with taper, step, arc and other workpiece is realized by forming cut-in grinding. Sand repair device adopts dovetail groove pure hand-shoveling flower structure to ensure the precision and stability of dressing device; The sand repairing device is separated from the spindle seat of the grinding wheel to avoid the impact of resonance caused by high-speed rotation of the grinding wheel on the accuracy of sand repairing. Rollers can be equipped for sand repairing according to customers' requirements.

(5) Circuit system:
    The circuit of the whole equipment adopts Beijing Schneid-er circuit system, beautiful and durable, good operation. Increase the height of the electric box, and equipped with air conditioning cooling device, convenient operation at the same time, more conducive to the circuit system heat dissipation.

(6) Numerical control system:
    Hotman secondary development of numerical control system, Chinese man-machine dialogue interface, easy to learn; With corresponding brand servo motor, one axis automatic feed, two axis CNC molding sand repair, good compatibility, accurate feed.
3.Installation environment requirement:

1	Supply voltage	380V
2	Total installed power	30KW
3	Operating ambient temperature	8-40ºC
4	Grinding fluid filtration method	Magnet or paper tape filter
5	Cooling water pump	0.5KW
6	Cooling water tank	300L

4.High rotation precision, excellent shock absorption, can bear super heavy work piece, super grinding force.
Pure liquid friction, low friction resistance, low power consumption, high transmission efficiency.
The wear caused by direct contact between metals will not occur during normal operation and frequent startup. The accuracy is good and the life is long.
Because the lifting of axle diameter is realized by the pressure of external oil, it has high bearing capacity under various relative motion speeds, and the change of speed has little influence on the stiffness of oil film.
The lubricating oil layer has good vibration resistance, and the shaft runs smoothly.
The oil film has the function of compensating error, reducing the influence of the shaft and bearing manufacturing error, and the shaft rotation precision is high.
Cone runout less than 0.002, spindle axial movement less than 0.002.
The maximum spindle speed is 1500 RPM.