When the machining plant processes mechanical parts, when the workpiece is too high, it shall be roughened with knives of different lengths in layers. After roughening with a large knife, the remaining materials shall be removed with a small knife. The flat bottom cutter is used to process the plane, and the ball cutter is used less, so as to reduce the processing time; If there is a slope and it is an integer, it shall be processed with a slope knife.
At the same time, set the tolerance reasonably to balance the machining accuracy and computer calculation time, do more processes and reduce the empty tool time; The hardness of blank material is high, so reverse milling is selected; The hardness of blank material is low, so forward milling is selected. Rough machining, reverse milling, finish machining, forward milling; The tool material has good toughness and low hardness, and is suitable for rough machining. The tool material has poor toughness and high hardness, and is suitable for finish machining.
For the clamping method of machined parts processed by NC machine tools in machining plants, it is also necessary to reasonably select positioning datum and clamping scheme. When selecting fine datum, it is generally necessary to follow the two principles of "datum unification" and "datum coincidence". In addition to these two principles, it is also necessary to consider completing the processing of all surfaces in one positioning clamping as far as possible. Therefore, The positioning mode that is convenient for each surface to be machined shall be selected.
When the workpiece is clamped at one time, it shall be able to complete the processing of all surfaces of the workpiece; When determining the placement position of the workpiece on the workbench, the influence of the processing of each station, the length of the tool and the stiffness of the tool on the processing quality should be considered. For the fixture used in controlled machining, the fixture assembled by general components and adjustable shall be selected as far as possible to shorten the production preparation cycle.
When the machining plant arranges the machining sequence, the basic principles must be observed, including "face before hole", "coarse before fine", etc. It is processed according to the centralized process of tools to avoid repeated use of the same tool and reduce the times and time of tool change.
For the hole system with high coaxiality requirements, the hole system at other coordinate positions shall be processed after the processing of the hole system is completed after one positioning, so as to eliminate the error caused by repeated positioning and improve the coaxiality of the hole system. Select and determine the tool point and tool change point. Once determined, it should not be replaced.