Industrial Straight Knives Sharpening Machine (for 3000mm Length) plastic crusher blade grinding machine.  Straight Knife Sharpening Machine is a specialized, heavy-duty grinder used to sharpen and hone the long, straight-edge blades critical to many converting and slitting processes.

factory price Crusher knife automatic straight blade sharpening machine. grindingall kinds of long and straight knives used in plastics, printing, paper making, machinery, food and other industries. Can be used for grinding, cutting edge, polishing edge; grinding straightness≤0.01mm/m

Knife sharpener is suitable for blades such as crusher blades, paper cutting blades, woodworking planer blades, plastic machine blades, medicine cutters and other blades. Available with grinding lengths ranging from 1500 mm to 3100 mm, or longer for special grinding purposes. Blade grinding machine features a heavy-duty reinforced machine base which gives the maximum stability. PLC controls the carriage movement during the various stages of the working cycle.Advantage

Key Features and Components

1. Long, Heavy-Duty Bed & Grinding Length: rigid bed (often 3500mm or longer) to fully support a 3000mm knife. This prevents flex and ensures geometric accuracy.

2. Precision Grinding Head:

   • Motor: Powered by a high-quality, electric motor (typically 4kW to5.5kW).

   • Grinding Wheel: Uses a large-diameter abrasive wheel

   • Adjustability: The head can be precisely adjusted for grinding angle

3. Magnetic Chuck: A powerful electromagnetic chuck runs the length of the machine bed.

4.  The grinding head moves smoothly back and forth along the length of the knife. This movement can be manual, hydraulic, or CNC-controlled for full automation.

5. Coolant System: An integrated coolant system is essential. It pumps coolant over the grinding point to:

   • Prevent overheating and “burning” the steel, which ruins its temper.

   • Wash away metal particles (swarf) to keep the wheel clean.

   • Extend the life of the grinding wheel.

6. Dust and Splash Guards: Full-length safety guards protect the operator from sparks, coolant spray, and broken wheel fragments.

 Knives Sharpening Process

1. Setup & Cleaning: The knife is removed from the slitter or cutter. The blade and machine’s magnetic chuck are thoroughly cleaned to ensure perfect, flat contact.

2. Mounting: The knife is carefully placed onto the energized magnetic chuck. Its back edge is aligned against a rear guide to ensure parallelism.

3. Parameter Setting: The operator sets the grinding parameters:

   • Grinding Angle: This is the most critical setting, determining the cutting bevel (e.g., 30° is common).

   • Cross-Feed: How much the wheel moves sideways per pass.

   • Depth of Cut: How much material is removed in each pass (typically very small, e.g., 0.01mm).

4. Rough Grinding: The machine is started. The grinding head moves along the knife, taking several passes to remove nicks, damage, and establish the primary bevel. The coolant flows continuously.

5. Fine Grinding / Honing: After the rough grind, a final, very light pass is made with a finer wheel or a slower feed rate to create a sharp, refined edge.

6. Deburring: A small burr (wire edge) often forms on the opposite side of the blade. This is typically removed by a quick, light pass on the back of the knife (with the magnet off or using a non-magnetic shim) or by using a honing stone.

7. Inspection & Demounting: The magnet is turned off, the knife is removed, cleaned, and inspected for a uniform, sharp edge along its entire length.