What is a knife rest?

What is a knife rest?

CNC machine tool is composed of spindle, tool changing device (tool holder, tool store manipulator), ball screw and other functional components. Most machine tool companies create complete machine tools by outsourcing, outsourcing different functional components and combining assembly.

Therefore, the reliability level of functional components will directly affect the reliability level of machines and equipment. Numerical control machining. Therefore, the key to improve the reliability level of CNC machine tools is to improve the reliability of key functional components of CNC machine tools.

The tool holder of CNC machine tool is the mechanical part that supports and fixes the tool, which plays a vital role in CNC machining. The design and function of tool holder directly affect the machining accuracy, efficiency and stability of CNC machine tool.

It is one of the key functional components of CNC lathes, and its reliability directly affects the stability and reliability of the whole machine. By realizing process integration and tool changing automation, NC tool handle significantly reduces tool changing time and ensures tool position accuracy.

The components of the handle:

Main structure: The main structure of the tool holder is usually made of cast iron or welded steel plate to ensure sufficient rigidity and stability. The parts are subjected to cutting forces and various loads during machining.

Guide rail system: The guide rail system is responsible for supporting and guiding the movement of the tool, which is usually composed of linear guide rail and ball screw and other components to ensure the accuracy and stability of the tool movement.

Tool clamping system: This part includes various parts of the clamping tool, such as chuck, clamping tool holder, etc., and its design directly affects the stability of the tool and the efficiency of tool change.

Tool adjustment device: Tool adjustment device allows the tool to be slightly adjusted to achieve precision and versatility during machining.

Cooling system: The cooling system is used to cool the tool, prevent overheating due to friction during machining, and also helps to extend the service life of the tool.

Support type:

The tool handle of CNC machine tool can be divided into many types according to its use, structure and characteristics. Here are some common types of tool handles for CNC machine tools:

Horizontal tool holder: Horizontal tool holder is a horizontal tool holder with the tool perpendicular to the working plane. This type of shank is suitable for horizontal milling, drilling and cutting operations.

Vertical tool holder: Vertical tool holder is a vertical tool holder, and the tool is level with the working plane. It is commonly used in vertical milling, drilling and cutting operations.

Gantry tool rest: Gantry tool rest is a large tool rest structure in which the tool rest moves along a gantry structure that spans the entire machining area. This type of tool holder is commonly used for machining large workpieces, such as steel structures, ships and aircraft parts.

Arm type tool rest: Arm type tool rest is a beam type tool rest that the tool rest moves along the arm structure. This type of tool holder is often used to realize complex workpieces such as automobile engine cylinder block and automobile frame.

Bridge tool holder: Bridge tool holder is similar to gantry tool holder, but the structure is simpler, and the tool holder spans the working plane. This type of tool handle is usually used for machining with higher precision requirements, such as mold processing and precision parts processing.

Rotary tool holder: The rotary tool holder has the tool rotation function, which can realize the processing of complex contours, such as curved surfaces, three-dimensional parts, etc.

Composite tool handle: Composite tool handle combines the functions of multiple tool handles to achieve milling, drilling, tapping, cutting and other processing operations.

The importance of the handle

Machining accuracy: The design and structure of the tool holder directly affect the machining accuracy of the CNC machine tool. The stable and strong tool handle can effectively reduce vibration and deformation, so as to ensure that the size and surface accuracy of the machined parts meet the requirements.

Processing efficiency: A well-designed tool holder can improve the processing efficiency of CNC machine tools. It can support a variety of cutting operations and ensure that the tool moves quickly and accurately, thereby reducing processing time and costs.

Stability: The stability of the tool holder is directly related to the stability of the CNC machine tool. The strong tool handle can effectively reduce the vibration and oscillation during the machining process to ensure the stability and reliability of the machining process.

Tool life: The right handle design reduces tool wear and damage, resulting in longer tool life and lower replacement and maintenance costs.

Versatility: The design of the tool handle should also take into account the versatility of different processing requirements. It should be able to accommodate various types and sizes of tools and support different types of machining operations, thereby increasing the application range and flexibility of CNC machine tools.