Things to pay attention to during CNC precision machining

1. Attentions in CNC precision machining

(1) When the workpiece is too high, it should be roughed with different lengths of knives in layers. After roughing with a large knife, a small knife should be used material removed.

(2) Use a flat-bottomed knife to process the plane, and a ball knife is rarely used in order to reduce the processing time; if there is a slope, and it is an integer, use a sloped tool for processing.

(3) Reasonably set up the staff, so that the machining accuracy and the computer calculation time are averaged with each other, and more processes are done to reduce the time for empty tools.

(4) If the hardness of the blank material is high, up-cut milling is selected; if the hardness of the blank material is low, down-cut milling is selected. Roughing up milling, finishing down milling.

(5) The tool material has good toughness and low hardness and is suitable for rough machining, while the tool material has poor toughness and high hardness and is suitable for finishing.

2. Machining technology of mechanical parts in Changzhou

(1) Parts clamping skills and fixture selection

CNC machining The clamping skills of the parts to be processed should also be reasonably selected for the positioning datum and clamping plan. When selecting the precise datum, the two principles of 'datum identical' and 'datum coincidence' should generally be followed, except for these two. In principle, we also need to consider:

a. Although all surfaces are processed in one positioning and clamping, the positioning method should be selected so that each surface can be processed.

b. When the workpiece is clamped at one time, it should be able to process the entire surface of the workpiece.

c. When determining the placement position of the workpiece on the worktable, consideration should be given to the processing that can be used at each station, the length of the tool and the impact of the stiffness of the tool on the processing quality.

d. The fixtures used in the control processing should be selected as far as possible, and the fixtures that are assembled by common components and can be adjusted to shorten the production preparation cycle.

(2) The placement of the processing sequence

When the CNC precision machining factory processes the sequence, the basic principles must be obeyed, including 'face first and then holeIn addition to these basic principles, we should also follow the following principles:

a. Process according to the tool-intensive process, so as to avoid repeated use of the same tool and reduce the number and time of tool changes.

b. Holes with very high coaxiality requirements should be processed after one positioning, and then the holes at other coordinate positions should be processed, which can eliminate The error generated during repeated positioning improves the coaxiality of the hole system.

c. Select the determined tool point and tool change point. Once determined, it should not be replaced.