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CNC Maching Prototype Craftsmanship
- Sep 04, 2017 -

CNC machine tool prototype refers to the machine manufacturing machine, also known as the machine or machine tool machine, used to refer to machine tools. Generally divided into metal cutting machine tools, forging machine tools and woodworking machine tools. In addition to cutting, there are casting, forging, welding, stamping, extrusion, etc., but those who require high precision and surface roughness requirements of the smaller parts, generally need to be in the processing of mechanical parts, Machine tool with the final cutting method. Machine tools play a major role in the construction of national economy modernization.

The lathe is a machine tool that mainly rotates the workpiece with a turning tool. In the lathe can also be used drill, reaming drill, reamer, tap, die and knurling tools such as the corresponding processing. The lathe is mainly used for machining shafts, plates, sleeves and other workpieces with slewing surfaces, the most widely used class in machinery manufacturing and repair plants

The quality of the machine itself, the quality of the machine directly affect the quality. Measuring the quality of a machine is a multifaceted, but mainly requires a good process, serialization, generalization, high degree of standardization, simple structure, light weight, reliable, high productivity. Specific indicators are as follows:

1, the possibility of the process

The possibility of the process is the ability of the machine to meet different production requirements. General machine can complete a certain range of various parts of the multi-process processing, the possibility of a wide range of technology, and thus relatively complex structure, adapted to single-piece production. Special machine tools can only complete one or several parts of a specific process, the possibility of its technology is narrow, suitable for mass production, can improve productivity, ensure processing quality, simplify the machine structure, reduce machine tool costs.

2, accuracy and surface roughness

To ensure the accuracy of the machined parts and surface roughness, the machine itself must have a certain geometric accuracy, motion accuracy, transmission accuracy and dynamic accuracy.

Geometric accuracy refers to the accuracy of the position between the parts when the machine is not running and the shape accuracy and position accuracy of the main parts. The geometric accuracy of the machine tool has an important effect on the machining accuracy, so it is the main index to evaluate the precision of the machine tool.

Motion accuracy refers to the geometric position accuracy of the main parts when the machine is operating at the working speed. The greater the change in geometric position, the lower the motion accuracy.

Transmission accuracy refers to the coordination and uniformity of motion between the end of the machine tool chain.

The above three kinds of precision indicators are detected in the no-load conditions, in order to fully reflect the performance of the machine, the machine must have a certain dynamic accuracy and temperature under the action of the main parts of the shape and position accuracy. The main factors that affect the dynamic accuracy of the machine stiffness, vibration and thermal deformation.

The rigidity of the machine refers to the ability of the machine tool to resist deformation under external force. The greater the rigidity of the machine, the higher the dynamic precision. The rigidity of the machine includes the stiffness of the machine tool itself and the contact stiffness between the components. The rigidity of the machine tool itself depends mainly on the material properties of the component itself, the cross-sectional shape, size and so on. The contact stiffness between the members is not only related to the geometrical and hardness of the contact material, the contact surface, but also the surface roughness, geometric accuracy, processing method, contact surface medium, preload and other factors of the contact surface.

Machine vibration, can be divided into forced vibration and self-excited vibration. Self-excited vibration is caused by any external force, excitation force interference, the internal vibration generated by the process of continuous vibration. Under the continuous action of the exciting force, the system is forced to cause the vibration to be forced vibration.

Machine vibration and machine stiffness, damping characteristics, quality. As the various parts of the machine thermal expansion coefficient is different, resulting in different parts of the machine deformation and relative displacement, this phenomenon is called thermal deformation of the machine. The maximum error due to thermal deformation can account for 70% of the total error.

For the dynamic accuracy of the machine, there is no uniform standard, mainly through the cutting of typical parts to achieve the accuracy of the accuracy of the machine to make a comprehensive evaluation of the dynamic accuracy.

3, serialization and so on

Machine series of serialization, generalization, standardization is closely linked, the series of products is the generalization of parts and parts of the standardization of the basis of the generalization of parts and parts of the standardization and promote and promote the series of work.

4, the machine life

The reliability and wear resistance of machine tool structures are a major indicator of machine life.