Common problems of graphite electrode electric discharge machining treatment of graphite powder

Graphite powder is processed expanded graphite flexible graphite. The types of graphite paper can be divided into flexible graphite paper, graphite paper for sealing, ultra-thin graphite paper, thermal conductive graphite paper, etc. The industrial sealing field uses graphite paper for sealing, which is flexible Graphite paper, graphite paper for sealing, ultra-thin graphite paper, etc. are very complete have a wide range of industrial applications.

Graphite paper is made of expanded graphite after pressing, rolling roasting. Graphite paper has high temperature resistance, thermal conductivity, flexibility, resilience good sealing. The high-quality graphite paper has superior sealing performance, thin thickness light weight. The graphite paper is easy to cut. Using the sealing performance thermal conductivity of graphite paper, graphite paper is mainly used in the field of industrial sealing heat dissipation. The graphite paper for sealing is thin in thickness, has the advantages of easy cutting, high temperature resistance, wear resistance, corrosion resistance, good sealing performance, long replacement cycle. The advantages of graphite paper for sealing play a very important role in the field of industrial sealing. The advantages of graphite paper for sealing can meet the requirements of industrial sealing. The graphite paper for sealing can be processed into graphite sealing products such as graphite sealing ring, graphite sealing ring, graphite sealing gasket, graphite packing, etc., which can be used for pipelines, valves, The sealing of pumps other interfaces can also be used for mechanical dynamic static sealing. Graphite paper for sealing is used as the raw material of graphite seals, which gives full play to the advantages of graphite paper for sealing. It is an indispensable material for industrial sealing production. The use of paper plays an important role in the field of sealing heat dissipation.

With the acceleration of the upgrading of electronic products the increasing demand for heat dissipation management of mini, highly integrated, high-performance electronic devices, a brand-new new heat dissipation technology for electronic products has also been introduced, that is, a new solution for heat dissipation of graphite materials. This new natural graphite solution uses graphite paper to dissipate heat efficiently, occupy a small space, is light in weight. It conducts heat evenly in two directions, eliminates "hot spots", shields heat sources components, improves the performance of consumer electronic products.

Graphite paper is a kind of graphite product made by chemically treating high-carbon phosphorus flake graphite expanding rolling at high temperature. It is the basic material for manufacturing various graphite seals.

Its main purpose: Graphite paper is also called graphite sheet, which uses its high temperature resistance, corrosion resistance,

Graphite powder

With good electrical conductivity, it can be used in petroleum, chemical, electronic; toxic, flammable, high-temperature equipment components, can be made into various graphite strips, fillers, gaskets, composite plates, cylinder gaskets, etc.

With the acceleration of the upgrading of electronic products the increasing demand for heat dissipation management of mini, highly integrated, high-performance electronic devices, a brand-new new heat dissipation technology for electronic products has also been introduced, that is, a new solution for heat dissipation of graphite materials. This new natural graphite solution uses graphite paper to dissipate heat efficiently, occupy a small space, is light in weight. It conducts heat evenly in two directions, eliminates "hot spots", shields heat sources components, improves the performance of consumer electronic products.

The main purpose of this new graphite paper application technology: applied to notebook computers, flat panel displays, digital cameras, mobile phones personal assistant devices. 1. Start of machining discharge is unstable

cause:

At the beginning of graphite electrode electrical machining, due to the small contact area of the workpiece, the presence of cutting chips burrs, concentrated discharge; due to the large discharge energy (high peak current, wide pulse width), the pulse interval is too narrow, the jet pressure is too high. Large, resulting in unstable discharge even arcing when starting processing.

solution:

1. Before processing, completely remove the cutting chips burrs attached to the workpiece, remove the oxide film, paint, rust, etc. produced by the heat treatment of the workpiece.

2. At the beginning, set the current to a smaller value. Then gradually increase to the peak current set the jet pressure to be smaller.

2. Produce granular protrusions

Causes:

1. If the pulse width is set too large, granular protrusions will be generated at the edges corners of the electrode, which will cause short circuits arc discharge;

2. There are too many machining chips of electro-corrosion products to be discharged; the angle of the machining fluid nozzle is set incorrectly, the machining fluid cannot be fully sprayed into the gap, the machining chips of electro-corrosion products cannot be fully discharged; when the machining depth is too deep, the machining chips cannot Fully discharged, stay at the bottom.

Solution:

1. Shorten the pulse width Ton prolong the pulse interval Toff to suppress the generation of granular protrusions the generation of processing chips of electro-erosion products.

2. Try to set the nozzle on the side of the electrode; if the processing depth is too deep,

3. Increase the number of beats of the electrode, speed up the beat, shorten the discharge time.

Three. Depression on the bottom of the processing

cause:

In the process of EDM, the pulse interval is too small, the electrode jumps up down slowly, the jet pressure is weak. As a result, the machining chips of the electrolytic corrosion products cannot be fully discharged, many electrolytic corrosion products adhere to the bottom surface of the electrode to form carbide blocks. It is easy to detach during the up down movement, resulting in depressions on the bottom surface of the processing

solution:

1. Extend the pulse interval.

2. Increase the electrode beating speed.

3. Increase the jet pressure.

4. Use a brush to clean the machining chips on the electrode end face the machining bottom face.

4. The bottom surface roughness is uneven curved

cause:

Because the pulse interval is too small, the jet pressure is uneven, the gap between the electrodes is too small, the electro-erosion products cannot be fully discharged, the distribution on the processing bottom surface is uneven, so that as the processing continues, the bottom surface will bend cause the processing bottom surface The roughness is uneven.

solution:

1. Increase the pulse interval set a constant jet pressure,

2. Increase the gap between the poles check the chip removal frequently.