English Translation

GB4250/70 Double-Column Horizontal Metal Band Sawing Machine

1. Equipment Model: GB4250/70

1.1 Main Purpose of the Equipment

This machine is primarily used for cutting metal profiles, pipes, round stock, and square billets. By selecting appropriate process parameters, it can cut various ferrous and non-ferrous metal materials.

It is widely used in large and medium-sized enterprises such as steel, mold/die, machinery, metallurgy, mining, petroleum, automotive, shipbuilding, and machine tools. It is an ideal processing equipment for sawing large workpieces. Key features include:

• Cutting Tool: Utilizes a bi-metal band saw blade.

• Advantages: Narrow kerf (cut width), low material wastage, and low power requirement.

• Efficiency: High-efficiency cutting equipment that saves both material and energy.

1.2 Main Technical Parameters

1. Maximum Cutting Range (mm) :  Round: bullet 500 mm

   • Square: blacksquare 500 x 700 mm

2. Cutting Line Speed (m/min): 3 Stages (22, 45, 65)

3. Feed Speed Adjustment Method: Hydraulic stepless speed regulation

4. Saw Band Specifications (L x W x T) (mm): 5640 × 41 × 1.3

5. Clamping Method: Hydraulic clamping

6. Saw Band Tensioning Method: Manual tensioning

7. Main Motor Power (kW): 5.5

8. Oil Pump Motor Power (kW): 1.5

9. Cooling Motor Power (kW): 0.09

10. Machine External Dimensions (mm): 2800 × 1200 × 1880

2. Main Structure and Performance of the Machine

1. Machine Base: A welded steel plate structure containing a built-in hydraulic station and coolant reservoir. The machine is mounted via the base to the foundation to support the weight of the machine and the workpiece.

2. Worktable: The surface is smooth and flat. The workpiece must be placed on the table for cutting; it is a key component for ensuring cutting precision. The table features a receiving plate for materials and a set of clamping vises driven by a lead screw and hydraulic cylinder to ensure the workpiece remains fixed during the cutting process.

3. Columns: Divided into a main column and an auxiliary column. The main column is cylindrical; the saw frame and base are connected via the main column for vertical movement, which is essential for working precision. The auxiliary column is square-shaped and serves as a guiding mechanism for the vertical motion.

4. Saw Frame: A welded steel plate structure used to house and connect the main transmission device, the band saw tensioning mechanism, and the saw band guiding mechanism.

5. Main Transmission: Utilizes a worm gear transmission system consisting of a main motor, a worm gear box, and a saw wheel assembly. It is primarily used to transmit torque and drive the rotation of the band saw blade for cutting. Three cutting speeds can be achieved by shifting the belt on the pulleys to suit the cutting requirements of different materials.

6. Saw Band Tensioning Mechanism: Composed of a driven wheel, tensioning seat, tensioning handle, and sliding block. By rotating the tensioning handle, the sliding block moves the saw wheel to achieve blade tension. This creates specific pressure between the saw band and the rim of the wheel, generating enough friction to drive the saw band in its rotational motion.

7.  Saw Band Guiding Mechanism: Composed of a crossbeam, guide arms, guide heads, and alloy plates. The saw band passes through bearings on the guide heads to twist and maintain a vertical position relative to the worktable. The alloy plates fit closely against the back and sides of the saw band to minimize vibration and friction. The guide arms are locked onto the crossbeam; when cutting workpieces of different widths, the guide arms can be moved to maintain the shortest possible distance between the left and right guide heads This ensures that the flexible saw band gains both enhanced rigidity and appropriate flexibility, thereby extending the service life of the blade.

2.1 Working Principle of the Machine

• Hydraulic System: Consists of an oil tank, hydraulic motor pump set, overflow valve, solenoid directional valve, speed control valve, pressure gauge, filter, lifting cylinder, clamping cylinder, and piping. The electrical system controls the solenoid valve to complete the lifting/lowering of the saw frame and the clamping of the workpiece. Stepless speed regulation of the feed rate is achieved via the speed control valve to meet the sawing requirements of different materials.

• Electrical System: Consists of limit switches, terminal boards, junction boxes, electrical control boxes, operation panels, electrical components, and cables. It controls the rotation of the saw wheel, the movement of the saw frame, and the clamping of the workpiece to ensure the sawing process is completed according to the operational sequence.

2.2. Machine Operating Environment

• Power Supply: 3AC, 380V \pm 10\%, 50Hz \pm 1Hz

• Temperature: -5 to 45C

• Relative Humidity: <95\%

2.3. Technical Standards for Band Sawing Machines

This machine complies with:

• JB/T4318.3-2013: Technical conditions for horizontal band sawing machines.

• GB16454-2008: Safety technical conditions for metal sawing machines.