Jdc Molybdenum Wire

JDC Molybdenum Wire uses an advanced process for longer service life and requires no special maintenance. Made of precious metals to ensure a longer service life. On the other hand, our Jdc Bright 0.18mm Edm molybdenum wire realizes the function of pulsed spark discharge ablation and cutting metal forming on the workpiece. High frequency power can be increased to improve roughing efficiency, thus ensuring a longer service life.

Product name	JDC molybdenum wire
purity	99.99%
Diameter	0.14mm,0.18mm,0.2mm
Length	2000M,3000M
Note	The storage environment of molybdenum wire should be placed in a room free of acidic and alkaline harmful gases and with a relative temperature not higher than 65℃. The normal vacuum-packed product has a shelf life of more than 6 months.

 

Our supply Molybdenum Wire Brands

1. Broken wire related to molybdenum wire

1. Tension and wire speed

1) Increasing the tension of molybdenum wire can reduce the influence of wire vibration, thereby improving precision and cutting speed, and significantly reducing broken wires. It is generally considered that the tension is more suitable at 12-15N.

2) The increase of the wire speed is beneficial to the molybdenum wire to bring the working fluid into the discharge gap of the workpiece with a large thickness, so as to ensure the elimination of electric corrosion products and the stability of electric discharge machining. However, if the wire speed is too high, the molybdenum wire will vibrate seriously, which will destroy the stability of processing, the processing accuracy and surface roughness will deteriorate, and it will easily cause wire breakage. When the wire speed is too low, due to the large loss, it is also easy to break the wire. Generally, it is better to be less than 10m/s.

2. Broken wire related to the guide wire structure

1. Broken wire related to the wire drum

1) The inner and outer circles of the wire delivery drum are not on the same axis, which will cause unbalanced inertia, and it is easy to cause overlapping of wires during operation, resulting in broken wires.

2) The shafts and bearings of the wire drum often have gaps due to wear and tear, which can easily cause the wire to vibrate and break the wire.

3) If the high-frequency power supply is not cut off when the wire drum changes direction, it will cause the molybdenum wire to burn due to high temperature in a short period of time. damage).

4) Keep the wire feeding cylinder and guide wheel flexible, otherwise the wire guide system will vibrate and the wire will be broken during reciprocating operation.

5) It is necessary to adjust the limit stopper at the rear end of the wire drum to prevent the wire drum from rushing out of the limit stroke and breaking the wire.

6) Stop the machine shortly after reversing to prevent the wire drum from damaging the transmission parts and breaking the molybdenum wire due to inertia overtravel.

2. Broken wire related to guide wheel and conductive block

1) If the guide wheel and the conductive block have grooves due to wear, or the guide wheel bearing wears and there is a gap, it is easy to cause the molybdenum wire to vibrate and break the wire.

2) It should be ensured that the molybdenum wire is in good contact with the conductive block, the processed workpiece and the work surface, otherwise the negative electrode of the high-frequency power supply cannot be connected to the molybdenum wire or cause poor contact.

3. Broken wire when processing thick workpieces

Molybdenum wire ring

Thick workpieces generally refer to workpieces with a thickness greater than 100mm. The main causes of broken wires are:

1. Broken wire at the beginning of cutting

This is because the molybdenum wire is outside the workpiece during the initial cutting, and the distance between the upper and lower guide wheels is large, which will cause the molybdenum wire to pull and shake, making the gap between the molybdenum wire and the workpiece unstable, and arc discharge is easy to form, so that the arc is concentrated in a certain place. For a while, it will cause broken wires. In EDM, arc discharge is the main factor causing corrosion damage to the negative electrode.

2. Broken wire during cutting

When the molybdenum wire cuts into the workpiece, due to the narrow slit, it is difficult for the emulsion to penetrate, and the electric corrosion products (carbon black and metal objects) in the slit are not easy to get rid of, which makes the processing conditions worse, and produces secondary and tertiary damage in the slit. EDM causes the kerf to widen and the gap to be in an unfavorable state, causing the pulse to form an arc discharge and causing wire breakage.

3. Broken wire at the end of cutting

In addition to the above-mentioned reasons, there are also wire breakage caused by the self-weight of the workpiece or the deformation caused by the internal stress of the workpiece material. The solution is: self-made Simple fixtures and material factories do necessary heat treatment before processing.

4. Broken wires related to working fluid

1. After the working fluid turns black, the overall performance will deteriorate, and it is easy to cause broken wires. Therefore, it is necessary to observe its color and smell its smell frequently, and replace it in time if any abnormality is found, so as to maintain a certain dielectric capacity of the working fluid. Especially when processing cemented carbide, there are many electric corrosion products, which can easily make the permeability and fluidity of the working fluid poor, resulting in poor chip removal.2. How to identify saponified liquid

1) Wrap a little new molybdenum wire, try cutting on the workpiece for about 1 hour, observe the color of the molybdenum wire, if it is off-white, the coolant can cut thinner workpieces, if black spots or black bars are mixed in the off-white, the diameter of the black bars is obvious Thinner, need to replace the new working fluid.

2) Look at the arcing and access currents. Start the wire feeding cylinder, and manually force the high-frequency current to be connected, so that the molybdenum wire slowly moves closer to the workpiece without touching the workpiece. The distance is about 1-1.5mm, and there should be no sparks at this time. Then cool the workpiece so that the distance between the molybdenum wire and the workpiece forms a liquid path. If sparks are generated or the reading value of the ammeter increases by more than 10mA on the basis of the original no-load (about 30mA under no-load), the working fluid can no longer be used at this time.

5. Broken wires related to electrical parameters

1. Select reasonable electrical parameters according to the thickness of the workpiece, and open the pulse interval a little, which is conducive to the discharge of molten metal particles. At the same time, the no-load voltage of the peak current should not be too high, otherwise the energy of a single pulse will increase, the cutting speed will increase, and concentrated discharge and arcing will easily occur, causing broken wires. Generally, the no-load voltage is about 100V.

2. Select the appropriate discharge gap according to the thickness of the workpiece. If the discharge gap is too small, it is easy to produce a short circuit, and it is not conducive to cooling and the removal of electric corrosion. If the discharge gap is too large, it will affect the surface roughness and processing speed. When cutting a workpiece with a large thickness At the same time, the large pulse width current should be selected as much as possible, and the discharge gap should be correspondingly larger (generally greater than 0.02mm), so as to enhance the effect of chip removal and improve the stability of cutting.

6. Broken wire related to high frequency power supply

1. The peak value of the short-circuit current is too large, that is, the number of power amplifier tubes invested is too much, which exceeds the current that the molybdenum wire can withstand, which will cause the molybdenum wire to overheat and become brittle due to excessive fatigue.

2. The negative wave of the high-frequency pulse is too large, and the negative wave of the pulse directly corrodes the molybdenum wire, which increases the loss of the wire, reduces the service life of the wire, and causes the wire to break in a short time.

3. Improper selection of pulse width and pulse interval. When processing a workpiece with a large thickness, the pulse width is too large, which will cause the phenomenon of concentrated discharge points in the discharge gap and burn the molybdenum wire; if the pulse interval is too small, the electricity in the gap will The corrosion cannot be fully discharged, the deionization is not sufficient, and the wire is easy to break. At this time, burn marks (ie, black spots) can be clearly seen on the molybdenum wire.

7. Broken wires related to table movement

1. The cutting accuracy of the workpiece is guaranteed by the screw, and the gap between the screw and the nut is eliminated by the spring. If the screw rod is poorly lubricated or the spring force is insufficient, it will cause the table to move at an uneven speed. In this case, when cutting, the high-frequency current will cause frequent short circuits. If the fault is not eliminated in time, it will inevitably cause broken wires.

2. When adjusting the frequency conversion tracking speed, the feed speed should be approximately equal to the work erosion speed as far as possible, so that the pulse utilization rate is high, the processing speed is fast, and the processing state is stable. The feed speed is too high, the short circuit is frequent, the wire aging is fast, and the processing current can be seen on the ammeter; Burn out the molybdenum wire.

 

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Customer-focused approach
Commitment to the best product quality
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On-time delivery
Ability to take on urgent needs
Competitive pricing policy
Commitment to a defined time frame
Easy access to our JDC Molybdenum Wire raw materials
Ability to meet customer volume requirements

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