How to set the shape parameters on the slow wire

When the machining within the time set by M is judged to be unstable, the pulse interval of the actual output is automatically extended by a multiple of the interpulse width set by the A parameter. Therefore, it is necessary to detect the change of the thickness of the workpiece, adjust the corresponding process parameters, and control the feed rate and discharge frequency of the electrode wire.

The broken wire is mainly due to the high temperature of the electrode wire caused by the concentration of electric spark discharge and Zen electricity, which is consistent with the detected precursor of wire breakage. Therefore, the study of the temperature distribution of electrode wires from the theory of heat conduction has become the main way to study the mechanism of wire breakage.

The results show that the thermal load before wire breakage exceeds the average value. The pulse width and wire diameter have a great influence on the wire temperature. The thermal convection coefficient has a great influence on the filament temperature, and the state of the flush is very important to avoid wire breakage. The effects of Joule heating and filament vibration can be relatively negligible.

For the equal energy pulse current power supply, the study shows that there are two important prerequisites for wire breakage: the spark discharge frequency suddenly rises in a short time, and the local temperature of the electrode wire is too high due to the high discharge frequency, which in turn leads to wire breakage.

The normal spark probability decreases, and the probability of normal sparks in the abnormal sedan car gradually increases, which is also a precursor to broken wire. As the filament loss rises, the electrode filament becomes thinner and eventually breaks. Therefore, it is necessary to detect the change of the thickness of the workpiece, adjust the corresponding process parameters, control the feed rate and discharge frequency of the electrode wire, and obtain the best cutting speed under the condition of continuous filament dust.

The first cutting task is a high-speed stable cut:

Pulse parameters: High peak current, long pulse width of the standard for high-current cutting, to obtain a higher cutting speed.

The amount of compensation for the center trajectory of the electrode wire is small

f=1 2 d+δ+s, where f is the compensation amount (mm); δ is the discharge gap (mm) at the time of the first cutting; d is the diameter of the electrode wire (mm); is the machining allowance (mm) left for the second cut; s is the trimming allowance (mm). In the case of coarse gauge cutting of high peak current, the single-sided discharge gap is approximately; The refinement margin is very small, generally only. The machining allowance depends on the roughness of the machined surface and the accuracy of the machine tool after the first cut, which is approximately within the range.

In this way, the amount of compensation for the first cut should be between, and the larger one will affect the speed of the second cut, and the smaller one is difficult to eliminate the traces of the first cut.

Wire walking method: high-speed wire walking, wire walking speed is 8 12m s, to achieve the maximum processing efficiency.

The task of the second cut is to refine and ensure the dimensional accuracy of the processing

Pulse parameters: Medium gauge is selected, so that the roughness after the second cut is in between.

Compensation amount f: because the second cut is refined, the discharge gap is small at this time, and the δ is not reached, and the processing quality required for the third cut is very small, only a few microns, and the two add up to about. Therefore, the compensation amount f for the second cut is about 1 2d+.

Wire walking method: In order to achieve the purpose of finishing, the low-speed wire walking method is usually adopted, the wire walking speed is 1 3m s, and the tracking feed speed is limited to a certain range, so as to eliminate the round-trip cutting stripes and obtain the required processing dimensional accuracy.

The task of the third cut is polishing

Pulse parameters: Trimming is performed with a minimum pulse width, while the peak current varies depending on the quality requirements of the machined surface.

Compensation amount f: theoretically the radius of the electrode wire plus the discharge gap, in fact, the finishing process is a kind of EDM grinding, the processing amount is very small, will not change the size of the workpiece. Therefore, only the radius of the electrode can be used as a compensation amount to achieve the desired effect.

Wire walking method: like the second cutting, the low-speed wire feeding can be used to limit the speed feed.

Summary. The setting of the Z-axis height of the slow wire is generally set in the control system of the machine tool, and the specific setting method can refer to the operation manual of the machine tool.

The setting of the Z-axis height of the slow wire is generally set in the control system of the machine tool, and the specific setting method can refer to the operation manual of the machine tool.

Can you tell us more about that?

The Z-axis height setting of the slow wire is generally set in the machine tool control system, and the specific setting method can refer to the manual of the machine tool control system. The reasons for the problem could be:1

The control system is not properly set, such as the incorrect Z-axis height set; 2.The structure of the machine tool is not properly designed, such as the travel of the Z-axis is not enough; 3.Improper operation of the machine, e.g. the operator does not follow the correct steps.

Workaround:1According to the instruction manual of the machine tool control system, the Z-axis height is set correctly; 2.

According to the structural design of the machine tool, the stroke of the Z-axis is correctly set; 3.Operate the machine correctly according to the operating instructions of the machine tool. Personal Tips:

1.When setting the Z-axis height of the machine tool, it is necessary to read the manual of the machine tool control system carefully to avoid improper setting; 2.When operating the source Zheng Shen to make the machine tool, it is necessary to carefully read the operation of the machine tool to avoid improper operation; 3.

When designing the structure of the machine tool, it is necessary to take into account the travel of the Z-axis to avoid the situation that the stroke is insufficient.