Crankshaft Grinding Machine-G1

• After-sales Service: 1 Year
• Warranty: 1 Year
• Type: Multi-Use Grinding Machine
• Processing Object: Crank Shaft
• Abrasives: Grinding Wheel
• Controlling Mode: CNC
• Model NO.: G1
• Automatic Grade: Automatic
• Cylindrical Grinder Type: Universal Cylindrical Grinder
• Precision: High Precision
• Certification: CE
• Condition: New
• Maximum Grinding Workpiece Length: 300mm
• Maximum Diameter of Eccentric Circle: 40mm
• Maximum Spindle Speed of The Head Frame: 600rpm
• Minimum Rotation Angle: 2arcsec
• Maximum Eccentricity: 15
• Maximum Torque: 210nm
• Transport Package: Wooden Box
• Trademark: Hotman
• Origin: China
• Production Capacity: 5000

Product Description

1.Equipment overview:
(1) Excellent performance:
     High precision, high rigidity, high efficiency is the basic characteristics of this grinding machine, because of the excellent performance of the machine tool, and the flexible design of file color, can be widely used in aviation, medical, hydraulic, mold, high-end automobile manufacturing, robot reducer and other industries of camshaft, crankshaft and drive shaft, eccentric shaft workpiece precision grinding, can achieve a clamping, Grinding two eccentric shaft outside diameters and multiple eccentric outside diameters. Outstanding performance - for air conditioning compressor crankshaft, refrigerator compressor crankshaft and similar parts with superior processing performance.
(2) Machining accuracy of equipment:
    After Hotman crankshaft grinder grinding (grinding), can meet the following standard accuracy requirements:

No.	Model	Work piece	Cylindricity	Roughness
1.	G1	Standard sample	≤0.002mm	≤Ra0.4

  Note: rough grinding (generally grinding amount 0.03~0.05mm); Fine grinding (generally grinding amount 0.01~0.015mm)
(3) Technical specification:

Project	Parameter	Project	Parameter
Scope of work		Head frame part
Maximum grinding workpiece length	300mm	Maximum spindle speed of the head frame	600rpm
Maximum diameter of eccentric circle	40	Minimum rotation Angle	2arcsec
Maximum eccentricity	15	Repeated positioning accuracy	±2arcsec
Clamping mode	Pressure measuring fixture (Hotman custom)	Maximum torque	210NM
Grinding accuracy	Cylindricity 1.0μm	Head frame spindle power	12KW
Grinding wheel head part		Trimming part
Grinding wheel spindle type	Ball bearing motorized spindle	Dressing spindle type	Motorized spindle
Maximum spindle speed of grinding wheel	8000rpm	Trim the maximum spindle speed	8000rpm
Maximum linear speed of grinding wheel	120m/s	Maximum linear speed of trimming	45m/s
Grinding wheel spindle cooling mode	Oil cooling	Trimming spindle cooling mode	Oil cooling
Dimensions of CBN grinding wheel	250x20x25(Outside diameter x inside diameter x width)	Diamond roller size	100x32(Outer diameter x inner longitude)
Grinding wheel spindle power	13KW	Dressing spindle power	0.6KW
X-axis part (hydrostatic guide + linear motor + grating ruler)		Z-axis part
Maximum stroke of X axis	50mm	Maximum z-axis stroke	280mm
X-axis positioning accuracy	0.5μm	Z-axis positioning accuracy	3.0μm
X axis feed repeated positioning accuracy	0.3μm	Z-axis repeated positioning accuracy	2.0μm
Minimum resolution of X axis grating ruler	0.0001mm	Z axis screw precision class	C2
Maximum acceleration on the X-axis	3m/s	Maximum Z axis velocity	15m/min
Straightness of static guide	0.001/500mm	Z-axis motor power	3.0KW
Hydrostatic guide cooling mode	Oil cooling	Screw rail lubrication method	Grease lubrication
Hydrostatic guide feed system		Other
Total tank capacity	240L	Machine tool size (length x width x height)	3250X3000x2050mm
Total power of hydrostatic system	5.2KW	Total power supply voltage of the device	AC380V
Total cooling power of oil cooler	4.5KW	Control loop voltage	AC110V/DC24V
Hydrostatic guide pressure fluctuation	<2%	Total power of equipment	50KW
Oil products (two kinds)	Mobil Veros No. 6 / Amey Precision Spindle oil	Total weight of equipment (gross weight approx.)	7000KG
3 stages of filtration/accuracy	100μm/5μm/2μm	Height from the ground to the center of the work	1163mm(No cushion iron included)
Standard accessories		Optional part
Ceramic CBN grinding wheel	1PCS	Oil mist collector	1Set
Diamond roller	1PCS	Mapos P1DAE anti-collision and grinding wheel online detection system	1Set
Standard fixture	1Set	Centralized filtration system	1Set
High precision hydrostatic guide oil supply system	1Set	Grinding fluid high and low pressure control system	1Set
Oil cooler	2PCS	Special oil for hydrostatic guide	200L/Barrel
Standard hand tools and toolboxes	1Set	Spare ceramic CBN grinding wheel	1PCS
The first addition of lubricating grease	Screw rail grease	Spare diamond dressing roller	1PCS

2.Main characteristics:
 (1)   This equipment is mainly for the compressor industry crankshaft precision grinding, grinding camshaft, crankshaft, drive shaft and eccentric shaft workpiece. Using advanced numerical control system, the manipulator realizes automatic clamping, grinding multi eccentric shaft diameter, further improve the efficiency, shorten the grinding time, but also avoid the precision error of human tooling enjoined; The grinding wheel dressing device with fixed dovetail structure strengthens the maintenance of dressing accuracy. The on-line monitoring of the anti-collision system of the air elimination range makes the equipment safer to use and effectively implements a complete dressing cycle. The hydrostatic guide rail is adopted for grinding feed, which has high rigidity, no wear, smooth and smooth transmission, and does not produce any vibration, greatly enhancing the positioning accuracy and machining accuracy.

Equipment structure diagram


Casting analysis

(2) Cast iron machine tool body
    Design features of the bed and main components:
    In the grinding process, the most important thing we need is to maintain accuracy. The maintenance of accuracy depends on thermal stability more than vibration resistance. Cast iron itself has a very low coefficient of thermal expansion, more important is cast iron compared to artificial granite
    It says it has very high heat conductivity. Machine tools generate a lot of heat during production, and this heat can be quickly and evenly transmitted through the cast iron bed, thus keeping the machine tool in an extremely stable state.
The key parts of the machine tool such as grinding wheel head, workpiece head, spindle and all bearing supporting components are made of high grade cast iron or steel material, to ensure a homogeneous, continuous and stable coefficient of thermal expansion between the machine tool bed and components. Any occasional short time thermal changes are compensated by the stable composite cast iron, which provides a more stable environment, high rigidity and high seismic resistance, and its sturdiness is superior to typical artificial granite structures, making it ideal for high precision grinding machines. The outstanding point is that the working surface processing area is designed with inclined surface and hollow drainage structure, so that the grinding coolant is timely and smooth discharge.
(3) Z axis screw feed:
    Z-axis feed shaft adopts preloaded high-precision linear guide rail design, which can withstand loads in all directions. There is a lubrication reflux channel between the guide rail, and the guide rail moves smoothly, so that the friction coefficient reaches the minimum, eliminates the possibility of low speed crawling, reduces the wear of the guide rail to the greatest extent, increases the service life, and greatly improves the programming accuracy. C3 class ball screw has excellent accuracy retention.

(4)  High rigidity and high speed grinding wheel motorized spindle
    Grinding wheel spindle adopts ball bearing motorized spindle, dynamic balance level G1, grease lubricated spindle bearing, maximum speed 8000rpm, shaft end radial runout and end runout W0.001, internal design cooling cycle, can quickly cool the spindle.

(5) High precision head frame:
     Workpiece shaft adopts high precision, high rigidity, high torque permanent magnet synchronous motorized spindle, built-in Renishaw circular grating ruler and encoder, fast response, high positioning accuracy. At the same time, it has excellent hard torque characteristics, and still has high speed stability under the condition of load fluctuation. It improves the machining surface precision and expands the range of precision grinding and low-speed strong grinding.
     Workpiece fixture design through the balance simulation optimization, reduce the impact of fixture on processing accuracy, fixture compatible with the characteristics of conventional crankshaft parts, high universality, floating pressing mechanism, greatly reduce the error brought by pressing, thus improving the qualified rate and processing accuracy.