13. When processing workpieces on lathe faceplate angle iron, it is necessary to meet the position tolerance (parallelism, verticality) requirements.

What should we pay attention to?

Answer: When processing workpieces on lathe faceplate angle iron, it is necessary to meet the position tolerance (parallelism, verticality) requirements.

The following points should be noted:

(1) For workpieces with high precision requirements, its installation datum surface must be flat ground or finely scraped. The datum surface requirements

Straight, good contact.

(2) The faceplate plane of a lathe is best turned out on this lathe, and the angle iron must be finely scraped.

(3) When clamping the workpiece, prevent the workpiece from deforming.

(4) After the workpiece is installed, it must be balanced.

(5) Excessive lathe spindle clearance and uneven guide rails will affect the shape and position accuracy of the workpiece.

14. Which cutting fluid should be used for finishing stainless steel and aluminum alloys?

Answer: When finishing stainless steel, oxidized kerosene or 75% kerosene plus 25% oleic acid or vegetable oil should be used.

When finishing aluminum alloys, kerosene or a mixture of kerosene and mineral oil can be used.

15. What are the characteristics of deep hole processing and what measures should be taken in the process?

Answer: Characteristics of deep hole processing: As the length of the hole increases, the rigidity of the cutting tools used for hole processing weakens.

On the other hand, the improvement of hole accuracy and surface roughness requirements makes the tool shape more complex. Deep hole plus

The tool is prone to vibration and the axis of the machined hole deviates from the center; it is difficult to inject cutting fluid and the chips are difficult to discharge.

Chips are often blocked, which pulls the hole wall and intensifies tool wear, which can easily cause the tool to break; the tool is buried in the

Cutting in deep holes cannot be observed, and the processing quality is difficult to control.

16. What are the main issues to pay attention to when turning multi-threads?

Answer: (1) Line dividing method and correct line dividing. If the wiring method is not selected properly and the wiring operation is incorrect,

The occurrence of line dividing error will cause the pitch of the multi-thread turned to be unequal, thus seriously affecting the internal and external threads.

The screwing accuracy of the grooves will be affected and the service life will be reduced.

(2) The adjustment of the lathe exchange gear should be determined according to the lead, and the position of the lathe handle should be adjusted correctly.

(3) The lead of multi-thread threads is relatively large, so special attention should be paid to the influence of lead on the clearance angle of the two cutting edges of the tool.

The helix angle should be calculated based on the lead and should be paid attention to when sharpening.

(4) When finishing multi-threads, all spiral grooves must be finished together after rough turning. Otherwise, it will be difficult to ensure the consistency of the thread profile.