Defects and countermeasures of carburizing parts in quenching furnace are common

The carburized layer presents large bulk or reticular carbides

Mesh belt furnace defects cause: high surface carbon concentration

1. Drip carburizing, drip too large

2. Control atmosphere carburizing, rich gas too much

3. Liquid carburizing, salt bath cyanide root content is too high

4. Carburizing and quenching furnace air cooling, cooling rate is too slow

Countermeasures:

1. Decrease the surface carbon concentration, reduce the amount of drops in the dispersion period and improve the humidity in the dispersion period, and also reduce the amount of drops in the carburization period

2. Carburizing agent to reduce solid carburizing

3. To reduce the content of cyanogen in liquid carburizing

4. Summer room temperature is too high, after infiltration air cooling parts can be blown cold

5. Improve the quenching heating temperature of 50~80 C and extend the heat preservation time appropriately

6. Two mesh belt type quenching furnace quenching or normalizing + quenching, but also normalizing + high temperature tempering, then quenching furnace tempering

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Check the preparation work of table furnace produced by electric furnace factory

Last we did a detailed introduction and explanation of the Danyang electric furnace. This article we simply to the electric furnace factory production table furnace preparation work inspection items to describe, as a professional manufacturer electric furnace factory co., LTD., will try our best to sort out and publish all kinds of related knowledge, wholeheartedly for your service.

Table furnace preparation inspection items produced by electric furnace factory:

1. Check whether the power supply of the equipment is normal, whether there is phase break, short circuit or bare wire, etc.

2. Check whether the connection of grounding device is in good condition.

3. Check whether there is any damage to the heating element, whether the contact of each connection is good, whether there is any contact with the trolley furnace body and housing.

4. Check the temperature control system for abnormal phenomena.

5. Check whether the lifting of the furnace door and the running of the trolley are normal.

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Net belt blackening production line

Net belt blackening production line (absolutely environmentally friendly)

Normalizing furnace, net belt furnace type blackening furnace USES the workpiece to heat, reuses the environmental protection to send black liquid to soak and becomes. Completely different from the traditional sodium nitrite solid melting and blackening, it greatly improves the production efficiency, reduces the labor intensity and cost, improves the working environment of workers, and meets the requirements of high efficiency, energy saving and environmental protection.

It is applicable to the blackening process after pretreatment (no oil stains, no rust) of elastic strip, spring, hardware, standard parts, fasteners, bicycle parts and other metal parts, etc., and is suitable for mass production.

Process flow: manual feeding → cleaning machine → heating → blackening → drying → oiling → discharging

Maximum voltage: 380V Rated temperature: 350℃-400℃ Power: more than 11kW

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Measurement and control system of rotary furnace

As a large calcining equipment, the production process of the rotary furnace is relatively complex, so its production needs to be set up and monitored to test the running state. In order to help you better understand and use this equipment, this paper shares its measurement and control system with you.

1. Automatic control of temperature outside the roller
The temperature of the rotary furnace is automatically controlled, and the system can realize the automatic control of the temperature outside the drum. Furnace temperature can be set below the rated temperature, temperature control accuracy is less than 2 degrees. By controlling the external temperature of the drum, the temperature of the material in the drum can be controlled.
2. Exhaust outlet temperature detection
A bimetal thermometer is installed on the vent at the upper end of the air supply hood, mainly used to detect the temperature of the vent and display it on site, so as to observe the temperature change.
3. Roller speed regulation
The speed regulation of the drum is realized by the frequency conversion speed regulation of the driving motor. The operation panel of the inverter is installed on the panel of the control cabinet, which is convenient for operation and helpful for the operation of the equipment.
4. Feeding speed adjustment
Feeding speed is regulated by screw feed motor frequency conversion. The inverter operation panel of the converter is installed on the panel of the control cabinet for easy operation. Feeding speed should be decided in the trial production stage, and gradually groped to increase, confirm the appropriate feeding speed, not too fast.
5, dust removal fan frequency adjustment
Dust removal fan adopts frequency conversion speed regulation, flexible and convenient. The operation panel of inverter is installed on the panel of control cabinet for easy operation.

Through the above introduction, it is not difficult to find the composition of the measurement and control system of the rotary furnace, their existence is an auxiliary role for the equipment, and easy to operate, it needs to pay attention to the standard operation, so as to help the long-term use of the equipment.

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Five main steps of gas nitriding furnace

Gas nitriding furnace has the characteristics of low temperature, short time, small deformation of the workpiece, properties: high fatigue limit and good wear resistance.

1. The gas nitriding furnace prior to nitriding must be a normalizing or tempering treatment of the workpiece.

2. First use gasoline and alcohol to scrub the surface of the workpiece in the gas nitriding furnace, not rust spots, oil stains, dirty presence.

3. After loading into the furnace, tighten the pressing bolts of the furnace cover symmetrically.

4. Circulate the cooling water through the inlet of the furnace tank and the furnace cover. The lower end of the cooling water in the pipeline on the cover of the gas nitrification furnace is inlet water, while the upper end is outlet water. Inlet water is fed into the furnace tank separately and discharged separately. All water pipes in the cover of the gas nitrification furnace can be connected in series according to the principle of low inlet and high, with one inlet and one outlet discharging.

5 gas nitriding furnace before the temperature should be sent to exhaust nitrogen, exhaust flow should be more than twice the use.

Exhaust after 10 minutes, to set the temperature control meter to 150 ℃, automatic heating switch to open, exhaust gas nitriding fireside and heated to 150 ℃ for 2 h and exhaust, and then to set the temperature control meter to 530 ℃, the ammonia flow down, maintain positive pressure in the furnace, vent has smaller flow upward pressure, when the temperature rises to 530 ℃, constant temperature constant current nitriding 3-20 h, then up the ammonia pressure, keeping the exhaust moderate pressure, nitriding 4-70 - h, then ammonia pressure down, back n 1 to 2 h, cut off power supply, give a small amount of ammonia, maintain positive pressure in the furnace, Ammonia supply can be stopped until the furnace temperature drops below 150℃.

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AC2000 air source processor oil water separator

Technical parameters:

1. Model: AC2000

2. Combination: AF2000 (air filter) +AL2000 (oil mist) +AR2000(pressure regulating valve)

3. Pipe diameter: G1/4

4. Working medium: air

5. Ensure pressure resistance: 1.5mpa

6. Ambient temperature: 5~60°C

7. Filter aperture: 40um

8. Recommended lubrication oil: Turbine No. 1 oil (IOS VG32)

9. Water filter glass capacity: 60CC

10. Feed glass capacity: 90CC

11. Weight: 0.75kg

12. Material of main accessories (body material: aluminum alloy, cup material: PC, protective cover: plastic)

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Analysis on the use stage of well furnace

There are several stages in the operation of a well furnace:

Furnace installation, exhaust and temperature rise:
1, after the well furnace to the temperature insulation 0.5~1h, make the temperature uniform, into the parts, hanging parts should be more than 10mm gap, to ensure that the gas unblocked.
2, the parts must be placed in the effective heating zone of the furnace tank, the upper end should not exceed the exhaust pipe, the lower end should keep a certain distance from the intake pipe, after installing the furnace exhaust time is about 20~60min.
3. The sample should be placed in three different positions: upper, middle and lower.
4, after the installation of the furnace, should immediately send infiltration agent exhaust (ethanol drops), when the temperature of the furnace to the specified temperature, in the outlet of the exhaust gas, such as the flame does not point, should increase the amount of infiltration agent or timely clean up the pipe pile.
5, the new furnace and the new fixture should be pre-nitriding treatment for 3~5h.
Insulation stage:
1. Check whether the ammonia decomposition rate and flow rate are normal at any time. When the furnace temperature meets the requirements and the ammonia decomposition rate is unstable, adjust the flow rate of ammonia gas, increase the flow rate, reduce the decomposition rate, and increase the decomposition rate.
2. In some nitrification tanks, the ammonia decomposition rate increases during long-term use. In order to stabilize the ammonia decomposition rate, 800~960 C 2~4h denitrification treatment is required after the furnace is shut down.
Furnace cooling:
Parts with high fatigue strength requirements shall be oil-cooled and silver-gray parts shall be required on the surface. Under the protection of ammonia or cracking gas, the lifting tank shall be cooled to 200 C before opening the tank to retrieve the workpiece.

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