First, under the premise of aluminum, the following aspects need to be considered:

First, irresistible factors:

1, the stability of the machine tool itself. If it is not a new machine tool or a large number of machines have been processed without commissioning, the size error caused by the machine tool itself will occur. There are several factors that cause the error of the machine tool itself:

Mechanical aspects:

1, servo motor and screw loose.

2, ball screw bearings or nuts wear.

3, insufficient lubrication between the screw and nut.

Electrical aspects:

1, servo motor failure.

2, there is dirt inside the grid ruler.

3, servo amplifier failure.

PMC recovery can be performed on system parameters, so do not mention it.

4, the workpiece after processing cooling deformation. This is basically unavoidable. When processing, pay attention to the use of coolant, and when performing in-position measurements, pay attention to the deformation of the cooled workpiece.

Avoidance factors:

1, processing process

In fact, most of the actual processing errors are caused by the unreasonable processing process. In order to ensure the basic processing process(such as milling NC machining, "first thick and then fine, first and then hole, first and then small" or fixture use, "reduce the number of clips., As far as possible, on the basis of the basic processing process details such as the combination fixture, the machining error caused by iron chips on aluminum parts is minimized, because aluminum parts are very soft, and the excluded iron chips can easily cause aluminum parts to cause processing errors. For example, deep holes are used as much as possible to allow iron chips to be discharged instead of G73 instructions.

2, cutting three elements: cutting speed VC, feed F, cutting depth AP and tool compensation

This aspect is really not very detailed, in simple terms, that is, under the premise of ensuring the quality of the processing and tool wear, adjust the parameters to give full play to the cutting performance of the tool, so that the cutting efficiency is the highest and the processing cost is the lowest. In the CNC lathe, there are elements such as tool head wear compensation.

3, numerical calculations in manual programming and automatic programming

In manual programming, calculation errors are also common, but most production is now automated programming.

4, the knife

The inaccuracy of the knife is also a factor that causes the size error. Try to select a good edge finder. If the machine tool has an automatic edge cutter, it is even better. If there is no edge finder test cut, this is the operating experience.