CNC lathe, turning center is a high - precision and efficient automatic machine tool. Equipped with multi-station dao tower or power tower, the machine will have a wide range of processing technology, performance can be processed straight cylindrical, slash cylinder, circular arc and a variety of thread, groove, worm and other complex artifacts, compensated by linear interpolation, arc interpolation function, and in the mass production of complex parts in good economic effect.
"CNC" is the abbreviation of English word "Numerical Control". The CNC machine tool is prepared according to the prefabricated processing procedure, automatically processing the parts processed. We put the parts of the processing craft route, process parameters and tool trajectory, displacement, cutting parameters (spindle revolutions, feeding, turning back, etc.) as well as the auxiliary function (in knife, spindle forward, reverse, cutting fluid, etc.), in accordance with the instruction code and procedures prescribed by the CNC machine format write into the processing program list, then this application form on the contents of the records in the control medium (such as punched tape, tape, disk, magnetic bubble memory), and then input to the numerical control machine tool numerical control device, thereby command machine parts.
The process from the analysis of the part graph to the control medium is called nc program. Nc machine tools and common machine tool processing parts of the difference between nc machine tools is according to the program automatically machining parts, while the common machine tool to operate by the people, we just change control machine action program can achieve the purpose of processing different parts. As a result, CNC machines are especially suitable for small batch and complex shapes requiring high precision.
Since the CNC machine must process the parts according to the procedure, the programmer can then enter into the numerical control device to direct the machine tool. The input of the program is through the control medium.
1. Preliminary preparation
Determine the typical batch process requirement, machining parts, and formulate the functions of the CNC lathe is to do a good job in preparation, reasonable choice of CNC lathe Meet the technological requirements of typical parts.
The process requirements of typical parts are mainly the structural dimensions, machining range and precision requirements of the parts. The control precision of CNC lathe is selected according to the requirement of precision, precision of the workpiece, positioning accuracy and surface roughness. Based on reliability, reliability is the guarantee of improving product quality and productivity. The reliability of nc machine tool is that the machine tool can perform its function under the specified conditions, and it is stable for a long time without failure. That means the average time of failure is long, even if there is a failure, it can be recovered in a short time and re-put into use. Select the machine with reasonable structure, excellent manufacture and batch production. Generally, the more users, the higher the reliability of the numerical control system.
2. Tool accessories and tool selection
Machine tool random attachment, spare parts and their supply ability, cutting tools are very important to the CNC lathe and turning center. Select machine tool, need to consider the tool and the attachment.
3. Focus on the identity of the control system
The manufacturer generally chooses the same manufacturer's products, at least the same manufacturer's control system, which brings great convenience to the maintenance work. Teaching units, due to the need of students to be informed, choose different systems, equipped with various simulation software is the smart choice.
4. Choose according to the performance price
Do function, precision not idle, not waste, do not choose to do not have irrelevant function with oneself.
5. Protection of machine tools
When needed, the machine can be equipped with fully enclosed or semi-enclosed protective devices, automatic cuttings.
The above principles should be taken into account in selecting the CNC lathe and turning center.
1. Lifting and transportation
The lifting and position of the machine tool shall be used for the special lifting tools provided by the manufacturer and shall not be used in other ways. No special lifting tools shall be required. The steel wire rope shall be used to hoist and place the parts according to the specified instructions.
2. Foundation and location
The machine should be installed on a firm foundation, the position should be away from the vibration source; Avoid sunlight and thermal radiation; Place in a dry place to avoid moisture and air flow. If there is a vibration source near the machine tool, the anti-vibration ditch must be installed on the foundation.
3. Installation of machine tools
The machine tool is placed on the foundation, should be in the free state to find the flat, then the ground bolt evenly lock. For common machine tools, the level meter reading is not more than 0.04/1000mm, for high-precision machine tools, the level is not more than 0.02/1000mm. When measuring the installation accuracy, it should be carried out at constant temperature, and the measuring tool should be used after a fixed time. The machine should avoid the method of forcing the machine to produce the forced deformation. Some parts of the machine should not be removed when the machine is installed. The removal of parts may result in the redistribution of the internal stress of the machine, thus affecting the precision of the machine tool.
4. Preparation before trial
After the machine tool geometry is qualified, the machine needs to be cleaned. Cotton or silk cloth that is soaked with cleaning agent shall not be used for cotton yarn or gauze. Anti-rust oil or anti-rust paint used to protect the guide surface and machined surface when the machine is removed. Clean the surface of the machine. Apply the machine tool rules to the sliding surfaces and working surfaces for lubricating oil.