CNC machining is not only used for machining parts in large batches, but also for machining parts in small batches with high precision. The CNC system has good flexibility and a high degree of automation. It is especially suitable for machining curved and curved parts with complex contours and shapes, as well as complex box-shaped and prismatic parts with a large number of holes and slots. Under the condition of multi-variety and small batch production, CNC machining can obtain higher economic benefits. So how does CNC machine parts?
CNC machining technology is basically the same as ordinary machining, but has its own characteristics. Therefore, when designing the CNC machining process of parts, it is not only necessary to follow the high degree of flexibility and automation of CNC machining, but also to be especially suitable for machining curved and curved parts with complex contours and shapes, as well as complex box-shaped and Prismatic parts. Under the condition of multi-variety and small batch production, higher economic benefits can be obtained by using CNC machine tools for processing.
The tool setting point and the tool change point of the CNC machining center are determined. The tool setting point is the starting point of the movement of the tool relative to the workpiece during the CNC machining process. Since the program is also executed from this point, the tool set point is also called the program start point or the tool start point. When programming, first consider the selection of the tool point position.
When the machining accuracy is not high, some surfaces on the workpiece or fixture can be directly used as the tool surface; when the machining accuracy is high, the tool setting point should be selected as far as possible on the design basis or process basis of the part. For parts positioned by holes, it is more appropriate to use the axis of the hole as the tool setting point.
The tool setting point must have a certain coordinate relationship with the positioning reference of the workpiece, so as to determine the relationship between the machine tool coordinate system and the workpiece coordinate system. The selection of tool points should facilitate the calculation of coordinate values and tool setting.
When setting the cutter, make the set point coincide with the cut point. The so-called tool position, for flat end mills, refers to the intersection of the tool shaft and the bottom of the tool; for ball end mills, it refers to the ball center of the ball head part; for turning tools, it refers to the tool tip; for drill bits, it refers to the Drill tip; for wire cutting machines, the focal point between the wire electrode axis and the surface of the part.
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