CNC machining programming flow chart
First, the determination and use of fixtures
In order to improve work efficiency and reduce auxiliary operation time, more attention should be paid to the selection of fixtures in CNC machining. Generally speaking, the fixture of the CNC machine tool is relatively simple, to ensure the clamp tightening and the accurate positioning of the rotatable tool during the machining process, at the same time, the selected fixture should be able to match the size and parts of the machine tool coordinate system. In CNC machining, in most cases, the combined fixture of general component assembly is selected, because the standard parts of this type of fixture have the advantage of repeated use, and can effectively reduce the equipment time and achieve better economic benefits.
CNC machine tool fixtures
Second, the problems that need to be paid attention to in the design of CNC fixtures
When designing the ordinary fixture, it is usually necessary to realize the fixture functions such as positioning, clamping, guiding, and tool setting, and when the CNC fixture is designed for positioning, clamping and other functions, it is necessary to rely on the workpiece coordinate system to determine the position of the workpiece and the tool on the basis of following the principle requirements of the ordinary fixture design.
CNC lathe two unit zero point positioning
Fourth, the rigidity requirements of fixture design
When designing the fixture, high rigidity should be considered as much as possible, because the determination of the CNC machining scheme will take the principle of process concentration, and sometimes the same set of fixtures will be used for finishing and rough machining, if the high rigidity can not be guaranteed in the fixture design, it may not be able to meet the needs of CNC machining.
Fifth, the number of clamping workpieces
In the process of fixture design, when determining the number of clamping workpieces, multiple workpieces should be clamped as much as possible, because when clamping multiple workpieces, the frequency of shutdown can be effectively reduced, and the time and number of tool changes can be reduced, which is obviously very helpful to improve the efficiency of CNC machining.
Multi-station vise
Sixth, the issue of replacement
In order to improve the utilization efficiency of the fixture, reduce the production cost and achieve higher economic benefits, the problem of its versatility should be considered in the process of fixture design, that is, it is designed to be a general-purpose fixture that only replaces one or several parts.
Schematic diagram of replacing the fixture of the locating piece