MT7160Horizontal Spindle Surface Grinder with Rectangular Table

MT7160/1.6M Horizontal Spindle Surface Grinder with Rectangular Table

1.     Introduction

 The MT7160/1.6M horizontal spindle surface grinder with rectangular table is a precision machining equipment used for grinding the horizontal surface of workpieces by using a grinding wheel, and can also be used for grinding the vertical faces and grooves of workpieces using the end face of the grinding wheel. The machine layout adopts a column that moves horizontally driven by an electrical motor, which can meet the requirements of rapid movement and intermittent feeding. The vertical movement of the worktable is hydraulically stepless speed-regulated, and the vertical guide rail lubrication uses a constant volume open static pressure guide rail. The horizontal and vertical guide rails of the column are composed of steel-embedded and quenched preloaded rolling guide rails, which are lightweight and have sensitive feed.

2.    Product Composition 

This machine tool is composed of a bed, column, grinding head, worktable and electromagnetic worktable, hydraulic system, mechanical transmission system, and control system.

3. Machine Structure Performance

(1)  Bed

The bed of the machine tool is made of high-quality cast iron, and undergoes a second artificial aging treatment during the manufacturing process. The internal structure is uniform, and the structural performance is stable, with advantages such as load-bearing, compression resistance, wear resistance, etc. The machine tool adopts a front and rear bed joint layout with a frame structure. There are one V-shaped and one flat guide rail design. The guide rail surface is precision machined, with good guiding performance, ensuring the accuracy, strength, and stability required for precision machining.

(2)  Column

The machine tool adopts a column movement layout, frame structure, and column grip grinding head form. The structure is advanced and the accuracy is stable. It is made of high-quality gray cast iron and undergoes a second artificial aging treatment during the manufacturing process. The internal structure is uniform, and the structural performance is stable, with advantages such as load-bearing, compression resistance, wear resistance, etc. The horizontal movement direction of the column is a steel-embedded and quenched rolling guide rail structure, which is driven by a motor through a screw. The movement is smooth and the accuracy is reliable.

(3)  Grinding Head 

The grinding head is composed of a sleeve, spindle, rolling bearing, flange, and grinding wheel chuck, and other components. The assembly is installed in the grinding head casing surrounded by the column, with the characteristics of convenient maintenance and simple assembly. The grinding head has 12 levels of automatic vertical feed, with an increment of 0.0025mm starting from 0.0025mm, and the minimum scale value of the lifting handwheel is 0.005mm, suitable for grinding large molds, tools, and cutters. The vertical movement direction of the grinding head is a steel-embedded and quenched rolling guide rail structure, which is driven by a motor through a screw. The movement is smooth and the accuracy is reliable.

(4)  Worktable and Electromagnetic Worktable 

The worktable is made of high-quality cast iron and undergoes a second artificial aging treatment during the manufacturing process. The internal structure is uniform, and the structural performance is stable, with load-bearing, compression resistance, wear resistance, and easy machining characteristics.

On the worktable, there are T-slots, which can fix the electromagnetic worktable or large workpieces. In the lower part of the worktable, there are one V-shaped and one flat guide rail design, and there are several oil chambers on the V-flat guide rail. During the operation of the machine tool, the external pressure oil is supplied to the oil cavities on the worktable guide rails, which pressurizes the oil and creates an oil film between the bed and the worktable guide rails. This ensures that the two relative moving guide rails are always in a liquid friction state, and the machine tool guide rails have a long service life and the guide rail surface never wears, which can maintain the geometric accuracy of the machine tool guide rails for a long time and ensure the machining accuracy of the machine tool.

The electromagnetic worktable is installed on the worktable surface as a fixture for holding general workpieces. The installation or removal of the electromagnetic worktable can be determined according to the workpiece being processed. The electromagnetic worktable has a demagnetization protection function.

(5)  Hydraulic System 

The vertical movement of the worktable is hydraulically controlled with infinite speed adjustment, and it uses fixed-capacity static pressure guide rails. The movement is stable and can bear heavy loads. At the end of the worktable, our company has developed a multi-pump system composed of multiple oil pumps. Each pump supplies oil to various oil cavities on the worktable guide rail, creating a certain amount of oil film between the worktable and guide rail, which avoids dry friction between the guide rails and ensures the precision of the guide rails over the long term. This makes the guide rails run smoothly and become wear-resistant guide rails.

(6)  Mechanical Transmission System and Control System 

6-1. The column of the machine tool can move laterally in continuous, automatic intermittent feed, and manual feed modes. When the column moves laterally, it can realize the reversing function. 

6-2. The grinding head has the functions of quick lifting, automatic vertical feed, and manual vertical feed. The automatic feed zero position is controlled, and the vertical automatic feed of the grinding head has 12 levels, starting from 0.0025mm and increasing by 0.0025mm per level. The minimum scale value of the lifting handwheel is 0.005mm.

(7)  Safety Protection 

The protective shield and grinding wheel protective cover of the machine tool strictly comply with the national standard GB15760-2004 "General Technical Conditions for Safety Protection of Metal Cutting Machine Tools" and the departmental standard "Safety Protection Technical Requirements for Grinding Wheel Protective Covers", ensuring the safe operation of the machine tool.

MT7160/1.6m Main Specifications and Technical Parameters

1.  Working table size (width x length): 600x1600mm

2.    Electromagnetic working table size (width x length): 600x800mm (two pieces)

3.   Maximum grinding height (with electromagnetic working table removed and using maximum grinding wheel): 550mm

4.   Grinding wheel size (outer diameter x width x inner diameter): φ450x63xφ203mm Minimum outer diameter of grinding wheel: 320mm

5.   Width of T-slot on the working table: 18mm

6.    Number of T-slots on the working table: 3

7.    Longitudinal movement distance of working table: manual 1800mm, hydraulic 1600mm

8.    Maximum transverse stroke of column: 680mm

9.    Distance from spindle centerline to working table surface: 160-775mm

10.  Longitudinal movement speed of working table: 2-30m/min

11.   Transverse movement speed of column: 1-30mm/stroke (intermittent), 0.075-1.5m/min (continuous)

12.   Cross movement speed of dressing pen (stepless speed regulation): 56-560mm/stroke

13.   Rapid movement speed of grinding head: 210mm/min

14.   Longitudinal movement distance of working table per rotation of handwheel: 27mm

15.   Transverse movement distance of column per rotation of handwheel: 2mm Minimum scale value of handwheel dial: 0.01mm

16.   Vertical movement distance of grinding head per rotation of handwheel: 0.2mm Minimum scale value of handwheel dial: 0.005mm

17.   Automatic vertical feeding amount of grinding head (12 levels): 0.0025-0.03mm

18.   Motors: Power (kw) / Speed (r/min)

(1)   Spindle motor: 15 / 1460

(2)   Transverse movement motor of column: 0.355 / 75-1500

(3)   Lifting motor of grinding head: 0.75 / 1400

(4)   Dresser motor: 0.135 / 200

(5)   Demagnetizer motor: 0.04 / 2.8

(6)   Hydraulic pump motor: 4 / 2900

(7)   Guide rail lubrication pump motor: 0.055 / 360-3600

(8)   Oil tank air-cooling motor: 0.55 / 1380

(9)   Cooling water pump motor: 0.12 / 2700

(10) Exchange oil pump motor: 0.55 / 1400

19.   Flow rates of each pump:

(1)   Cooling pump flow rate: 50L/min

(2)   Hydraulic pump flow rate (screw pump): 2900r/min, 90L/min

(3)   Exchange oil pump flow rate: 18L/min

(4)   Guide rail lubrication pump flow rate: 0.95-9.5cm3/min

20.   Electromagnetic working table suction: 8kg/cm2

21.   Machine tool dimensions (length x width x height): 4800x2599x2400mm

22.    Maximum occupied space of machine tool (length x width x height): 5100x2599x2400mm 

23.    Packing dimensions of machine tool (length x width x height): 5125x2700x2900mm

24.    Net weight: 11000kg   

25.    Surface roughness of test piece: Ra≤0.63μm

26.    Thickness uniformity of test piece: 300:0.005mm, proportional conversion for values less than 300 but not less than 0.001mm.

27.    Flatness tolerance of working table surface within 1 meter: 0.01mm.

MT7160 Horizontal Spindle Surface Grinder with Rectangular Table

1.     Introduction

The machine tool adopts a column movement structure, with steel-embedded roller guide rails in the horizontal and vertical directions, and hydraulic stepless speed regulation in the longitudinal direction of the worktable. The static pressure guide rail is of fixed volume type, and the grinding head adopts a rolling bearing sleeve structure. It is suitable for processing large molds, measuring tools.

 2.     Parameters

(1)   Worktable size (W x L): 600 x 1000 mm

(2)   Electromagnetic worktable size (W x L): 600 x 1000mm

(3)   Maximum grinding height (with the electromagnetic chuck removed and using the largest grinding wheel): 550mm

(4)   Grinding wheel size (outer diameter x width x inner diameter): φ450 x 63 x φ203mm 

(5)   Minimum outer diameter of the grinding wheel: 320mm

(6)   T-slot width of the worktable: 18mm

(7)   Number of T-slots on the worktable: 3

(8)   Longitudinal travel of the worktable: Manual: 1200mm  Hydraulic: 1000mm

(9)   Transverse travel of the column (Max.): 680mm

(10) Distance from the centerline of the spindle to the worktable surface: 160-775mm

(11) Longitudinal travel speed of the worktable: 2-30m/min

(12) Lateral travel speed of the column: Intermittent: 1-30mm/stroke  Continuous: 0.075-1.5m/min

(13) Lateral movement speed of the dresser (stepless): 56-560mm/stroke

(14) Fast movement speed of the grinding head: 210mm/min

(15) Longitudinal movement of the worktable per revolution of the handwheel: 27mm

(16) Transverse movement of the column per revolution of the handwheel: 2mm Minimum value on the handwheel dial: 0.01mm

(17)  Vertical movement of the grinding head per revolution of the handwheel: 0.15mm Minimum value on the handwheel dial: 0.005mm

(18)  Automatic vertical feed rate of the grinding head (12 levels): 0.0025-0.03mm

(19)  Motors: Power (kW) and speed (r/min)

1)     Spindle motor: 15 kW, 1460 r/min

2)     Transverse movement motor of the column: 0.355 kW, 75-1500 r/min

3)     Up-and-down movement motor of the grinding head: 0.75 kW, 1400 r/min

4)     Dresser motor: 0.135 kW, 200 r/min

5)     Hydraulic pump motor: 4 kW, 2900 r/min

6)     Guide rail lubrication pump motor: 0.09 kW, 360-3600 r/min

7)     Oil tank air-cooling motor: 0.55 kW, 1380 r/min

8)     Cooling water pump motor: 0.12 kW, 2700 r/min

9)     Oil exchange pump motor: 0.55 kW, 1400 r/min

(20)  Flow rates of various pumps:

1)     Cooling pump flow rate: 50L/min

2)     Hydraulic pump flow rate (screw pump): 90L/min at 2900 r/min

3)     Oil exchange pump flow rate: 18L/min

4)     Guide rail lubrication pump flow rate: 0.95-9.5cm3/min

(21)  Electromagnetic worktable suction: 8kg/cm2

(22)  Machine dimensions (Lx W x H): 3660 x 2449 x 2400mm

(23)  Maximum machine footprint space (Lx W x  H): 5330 x 2449 x 2400mm.

(24)  Machine packaging size (L x W x  H): 5125 x 2700 x 2900mm.

(25)  Net weight: 11000kg.