CNC Machining Errors 2
Errors caused by thermal deformation of process system Thermal deformation of process system has a great impact on machining errors, especially in precision machining and large machining, machining errors caused by thermal deformation can sometimes account for 50% of the total error of the workpiece.
Adjust the error in each process of machining, always to the process system to carry out one kind of adjustment work. Because the adjustment cannot be absolutely accurate, the adjustment error occurs. In the process system, the accuracy of the position of the workpiece and the tool on the machine tool is guaranteed by adjusting the machine tool, the tool, the fixture or the workpiece. When the original precision of machine tool, cutting tool, fixture and workpiece blank all meet the technological requirements without considering the dynamic factors, the adjustment error plays a decisive role in machining error.
Measurement error parts in the process or after the process of measurement, because of the measurement method, measuring accuracy and workpiece and subjective and objective factors directly affect the measurement accuracy. 9, internal stress without external force and exist in the parts of the internal stress, called internal stress. Once the internal stress is generated on the workpiece, it will make the workpiece metal in an unstable state of high energy potential. It will instinctively transform to a stable state of low energy potential, accompanied by deformation, so that the workpiece loses its original processing accuracy.
Tools in the process of mechanical processing is very important, is directly and processing quality and processing accuracy is closely related, in the rapid development of processing manufacturing today, a variety of new materials, new technology emerge in endlessly, the tool of the material and technology is also in constant change in the update. In the face of increasing processing requirements, as a machining person is to understand the types of tools and tool selection standards, today BMT will come to talk with you: what are the types of tools in machining? How to choose a tool?
What are the types of cutting tools in machining?
1. According to the tool material classification
High speed steel: high bending strength and impact toughness, good workability.
Hard alloy: the chemical vapor deposition method coated with titanium carbide, titanium nitride, alumina hard layer or composite hard layer, so that the tool wear is low, long service life.
2. According to the cutting movement of the tool classification
General tools: commonly used tools, planer, milling cutter, boring cutter, drill, reaming drill, reamer and saw.
Forming tools: commonly used forming tool, forming planer, forming milling cutter, broach, taper reamer and all kinds of thread processing tools.
Development tools: commonly used hob, gear shaper, gear shaver, bevel gear planer and bevel gear milling cutter disc, etc.
3. According to the tool work part classification
Integral: the cutting edge is made on the knife body.
Welding type: brazing the blade to the steel knife body
Mechanical clamping: the blade is clamped on the knife body, or the brazed knife head is clamped on the knife body
