- High reliability
The reliability of CNC machine tool is a key index of product quality. Whether the CNC machine tool can play its high performance, high precision and high efficiency, and obtain good benefits depends on its reliability.
- CAD design and modular structure design of CNC lathe
CAD can not only replace the manual to complete the tedious drawing work, but also can select the design scheme, analyze, calculate, predict and optimize the static and dynamic characteristics of the whole machine, and can simulate the working parts of the whole machine dynamically.
- High speed and high precision
Linear motor has high driving speed, good acceleration and deceleration characteristics, superior response characteristics and tracking accuracy. By using linear motor as servo drive, the ball screw as an intermediate transmission link is eliminated, the transmission clearance (including reverse clearance) is eliminated, the motion inertia is small, the system has good rigidity, and the precision positioning can be achieved at high speed, thus greatly improving the servo accuracy.
The linear rolling guide pair has very good thermal stability because of its zero clearance in all directions and very small rolling friction, small wear and negligible heating, which improves the positioning accuracy and repeated positioning accuracy in the whole process. Through the application of linear motor and linear rolling guide pair, the fast moving speed of the machine tool can be increased from 10 ~ 20m / MIM to 60 ~ 80m / min, and the maximum speed can reach 120m / min.
High speed and precision is the eternal goal of machine tool development. With the rapid development of science and technology, the upgrading speed of mechanical and electrical products is speeding up, and the requirements for the machining accuracy and surface quality of parts are becoming higher and higher. In order to meet the needs of this complex and changeable market, the current machine tools are developing in the direction of high-speed cutting, dry cutting and quasi dry cutting, and the machining accuracy is constantly improving. On the other hand, the successful application of motorized spindle and linear motor, ceramic ball bearing, low-temperature and high-speed ball screw pair with high-precision and large lead hollow internal cooling and ball nut strong cooling, and linear guide pair with ball retainer and other machine tool functional parts have also created conditions for the machine tool to develop towards high speed and precision.
CNC lathe adopts motorized spindle, cancels belt, pulley, gear and other links, greatly reduces the moment of inertia of the main drive, improves the dynamic response speed and working accuracy of the spindle, and thoroughly solves the vibration and noise problems of belt and pulley when the spindle runs at high speed. With the motorized spindle structure, the spindle speed can reach more than 10000 R / min.
Machining path refers to the movement path and direction of the cutter relative to the part in the process of NC machining.
The processing route should be shortened as far as possible to reduce the tool idle travel time
It should be able to meet the requirements of machining accuracy and surface roughness;
At present, under the condition that the CNC lathe has not been widely used, the excessive allowance on the blank, especially the allowance with forging and casting hard skin, should be arranged on the ordinary lathe. If must use the numerical control lathe processing, then needs to pay attention to the program flexible arrangement.
Key points of fixture installation: at present, the connection between hydraulic chuck and hydraulic clamping cylinder is realized by pull rod.
Reasonable selection of cutting parameters
For high efficiency metal cutting, the processed materials, cutting tools and cutting conditions are the three major elements. These determine the processing time, tool life and processing quality. The economic and effective machining method must be reasonable selection of cutting conditions. The three elements of cutting conditions: cutting speed, feed and cutting depth directly cause tool damage. With the increase of cutting speed, the temperature of tool tip will rise, which will produce mechanical, chemical and thermal wear. If the cutting speed is increased by 20%, the tool life will be reduced by 1 / 2.
The relationship between the feed condition and the tool wear is very small. But when the feed rate is large, the cutting temperature rises, and the back wear is large. It has less influence on the tool than the cutting speed. Although the influence of cutting depth on the tool is not as big as the cutting speed and feed rate, the hardened layer of the material to be cut will also affect the life of the tool
Regular and stable wear is the ideal condition. However, in the actual operation, the selection of tool life is related to tool wear, dimension change, surface quality, cutting noise, processing heat and so on. In determining the processing conditions, it is necessary to study according to the actual situation. For stainless steel and heat-resistant alloy and other difficult to machine materials, you can use coolant or choose a rigid blade.
Reasonable selection of cutting tools
In order to reduce the tool changing time and facilitate tool setting, the machine clamping tool and machine clamping blade should be used as far as possible.
In rough turning, the cutting tools with high strength and good durability should be selected, so as to meet the requirements of large back feed and large feed.
When finishing turning, the cutting tools with high precision and good durability should be selected to meet the requirements of machining accuracy.
Reasonable selection of fixture
Try to use general fixture to clamp workpiece, avoid using special fixture
In order to reduce the positioning error, the positioning datum of parts coincides.
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