Mirror sparking machine forming process should pay attention to the problem

Today I will come together with you to understand the mirror spark machine forming processing should pay attention to several issues.

First, to improve the processing accuracy of the problem:

Mainly including size accuracy and profiling accuracy. Affects the profiling accuracy of many factors, the first is the electrode loss, so the sharp corners, sheet and the main cavity decomposition processing, this part of the cavity as the pattern mold requires a large increase in pulse width. The use of large pulse widths and low currents is the main concern for low losses. Secondly, it is important to prevent back-sticking, especially in graphite, and to pay attention to the geometry of the cavity to prevent damage when processing with high energy. In addition, attention should be paid to the selection of a suitable leveling (shaking) track.

Secondly, the issue of improving the finish:

In addition to the previously mentioned factors of alignment, card loading and mechanical accuracy to be excluded, attention should also be paid to the following: always wait for the pockmarks of the previous gauge to disappear completely before moving on to the next gauge. During processing, especially fine gauge, do not stop for a long time to prevent the electrode from deforming and not being able to repair the light according to the intended gauge. Mirror power can be used. Without mirror power, the surface of the workpiece is indeed very demanding, the electrode can no longer be used twice, small pulse width, instantaneous change of polarity, or a little addition of uniform, fine particles of graphite powder, have a special light repair effect.

Third, to improve the stability of the processing of the problem:

To ensure stable processing, is an important condition to improve productivity and cavity mould quality. Processing instability, not only directly affect the etching speed, but also, often cause arc pulling, burns, damage to the processing surface, so that processing interruptions, and even scrap the mold. 1. first from the processing area to determine the appropriate current density, estimate the appropriate peak current, select the appropriate pulse duration and pulse interval time. 2. to ensure that the processing products in a timely manner, smooth exclusion; to prevent local "3. Pay attention to the cleanliness of the working fluid, change the oil or replace the paper core at the right time. (In particular, graphite and purple copper electrodes mixed machine tools) 4. graphite electrodes, pay attention not to use positive pressure direction, to prevent sparring off slag. 5. ensure servo sensitivity.

IV. Problems with starting the arc:

Before starting the arc, there are a series of abnormal phenomena, such as: smoke, sound, spark colour is normal; observe whether the screen display indicating the spindle feed is stable. If, however, it is found to be unstable, or back in the opposite direction, it indicates that there is carbon build-up; if clean-up is carried out in time, it will not yet cause serious burns to the electrode and workpiece. However, if not dealt with in time, too long, once the short-circuit pulling arc, from the surface maybe processing backwards stable, this will be over current, put electric spark is dark red, dull sound, white smoke, graphite electrode will also drop slag, stop check, clean carefully, otherwise, will repeat arc.