Really empty brazing furnace maintenance and maintenance work

Really empty brazing furnace maintenance and maintenance work

1, vacuum brazing air quenching furnace after the furnace, furnace domestic demand remain below 66.5 LPa vacuum.
2, inside furnace dust or not clean, soak through application of alcohol or gasoline silk cloth to wipe clean and dry.
3, furnace sealing structure of the vacuum system components such as tear open outfit, alcohol or gasoline clean and after drying, vacuum grease on besmear put on.
4, vacuum quenching furnace stove outside surface often wipe, running clean clean.
Parts and car parts should be clean, dry rear can into the furnace, prevent moisture, dirt from entering the furnace.
5, the transmission parts found screens, limit, control failure phenomenon, should immediately end of the line, don't strong operation, so as not to damage parts.
6, mechanical transmission parts should be lubricated periodically or oil changes and maintenance.
7, vacuum pump, valve, measuring instruments, thermal instrumentation, electrical components and other accessories, all in accordance with the technical specifications of the products to be repair and maintenance.
8, maintenance operation should be performed in the case of power failure. Under the condition of charged for repair, must ensure the absolute safety of person and equipment.

The importance of the theory of vacuum brazing furnace cooling system

The importance of the theory of vacuum brazing furnace cooling system

The vacuum gas quenching furnace with graphite heater heating way, by the body, vacuum system, water system, air system, startup system, electric control management system and so on several parts of structure.
In close to a vacuum brazing furnace heating by electric heating element, and has important effect on the service life of furnace body cooling system. Work condition cooling water channel should be kept unobstructed, avoid water temperature rise the phenomenon of downtime impact production schedule.
If water cooling system disorder, vacuum furnace heating system after long use a contraction harden etc. Phenomenon, serious still can appear short circuit phenomenon, reduce the service life of the furnace body is normal. So attention should be paid to the use of the cooling system maintenance, reduce sediment accumulation in the piping and water jacket, keep the water flow.
Periodically maintenance care, once appear, loss of expensive machines burning phenomenon, also prone to accidents, so the cooling system normal operation of the staff to ignore.

Vacuum furnace has so many functions

Vacuum furnace has so many functions

Vacuum boiler is in a closed furnace internal form a negative pressure of vacuum, filling heat medium water in the body. By burning heating heat medium water or any other way, again by heat medium water evaporation, condensation and heat exchanger, again by heat exchanger to heat to heat water.
Vacuum boiler heat conversion signal:
Oil, natural gas, gas, electricity - > combustion heat (electric conversion) - > heat medium water - > after boiling steam condensation heat transfer of -- -- -- -- > > heat exchanger heat transfer > water
Vacuum boiler working principle: using the characteristics of low water under the condition of low boiling point, rapid heating sealing furnace heat medium filled in water, high temperature steam, the heat medium water boiling evaporating out water vapor condenses on the heat exchange tube heat exchange tube in cold water, hot water supply.
Vacuum boiler by pumping air into vacuum state, almost no air to form a low pressure environment, and then use water (less than atmospheric pressure) under low pressure low temperature steam boiling, soda condensation heat transfer way will work the principle of heat output.
Vacuum heat medium boiler water is after deoxidization, descaling and other special processing of high pure water, a filling to complete before they go out, when used within the unit closed cycle (vaporization and condensation and evaporation), does not increase, not decrease, in unit service life does not need to supplement or replace.
Therefore, the vacuum inside the boiler furnace will never scale, corrosion, normal service life can reach more than 20 years, far more than ordinary hot water boiler the service life of 10 years or so.

Pump vacuum brazing furnace temperature is too high

Pump vacuum brazing furnace temperature is too high

Vacuum brazing furnace will inevitably be in the process of using all kinds of fault, pump vacuum brazing furnace temperature is too high? The following vacuum furnace manufacturers to share the solution.
(1) check the thermostat setting of the temperature control pump is in accordance with the regulations. If not, should be reset.
(2) pump cooling water flow rate of solid scale or other dirt jam for smaller. Lead to rising pump Yun. Because oil pump must have certain viscosity to ensure the sealing of pump. The viscosity is too small, the sealing performance variation. And pump oil viscosity with temperature rise and fall. The sealing of pump, oil saturation vapor pressure increases, vacuum degree reduced. Solution is to dredge waterways. Increase the flow of cooling water, the temperature of the oil pump shall not exceed 0 ℃ o l e., it is about 0 ℃.
(3) components assembly is undeserved, cause wear and tear, should be reassembled.

In the brazing furnace parts carburized control method

In the brazing furnace parts carburized control method

Parts carburizing in the brazing furnace control method, when the carbon carrier of hydrocarbon gas into the vacuum furnace, this method is available to control. Respectively under vacuum and negative pressure carburizing is known to all. Available hydrocarbon gas as gas carburizing agent, and the most common is methane. In certain furnace gas composition is known, is CH 'and N:, for example, or CH' + CO N: 10, a H:. Using these methods, because between the gas and carbon amount carburizing steel need not form a chemical equilibrium, so the oversupply in the gas carbon measures must be taken, for example through supply 0 h4. The necessary of excessive hydrocarbon gas supply has a weakness, is in the reaction process has yet to reach the free carbon occurs on the surface of the steel, such as the reaction of methane CH '= C + useful: black carbon is produced by this kind of free carbon and, with the concentration increased, the carbon black into carbon black cloud and visible.
It has two drawbacks: first, obstruct carburizing; Second, the pollution is carburizing and furnace. In addition and cause the danger of short circuit in the electric heating furnace. In order to reduce the carbon black, already use fixed pulse or how many according to adjust the way of pulse, quantity and time on the amount of hydrocarbon gas supply vacuum furnace control. But this method cannot obtain the effective results, and for the formation of infiltration layer depth and some inadequacies in the border carbon content, in order to get better comprehensive effect related to the carbon black form, the need for most different carburized parts determined by pulse test procedures. Therefore, only do a lot of testing under different conditions.

Vacuum brazing furnace operation procedures

Vacuum brazing furnace operation procedures

First, before the vacuum brazing furnace blow-in, ensure that water, electricity, gas in the assignments. In 380 v voltage, can not have the deviation of 10%. Pressure in 0.6 Mpa, the water pressure to the lowest (0.5 Mpa). Reach the above requirements to electricity, after operation.
Second, before feeding, check the equipment heating chamber, the heating chamber is necessary to clean, can not have sundry, dust, oil, water, etc. In view to put goods, dry cleaning, same before feeding the without watermarks, oil and other washing clean.
Third, after loading, the knob to the "door close" position. Then, a "mechanical pump" and "thick smoke valve". Of vacuum unit and the furnace smoke gas, opened the vacuum furnace with the power supply (general vacuum gauge power to launch with total power supply).
Fourth, when the vacuum degree higher than 1000 pa, vacuum gauge monitoring "J2" light. This time, can open "roots pump. Conditions such as, "roots pump" will not open, click on the button no response.
Five, when the vacuum degree is higher than 7 pa, vacuum gauge monitoring "J1" light. Level before this time, open the "valve" and "scattered pump". For preheating scattered "pump".
Six, to be scattered "pump" preheating time arrive 90 minutes time (on the counter investigation touch screen), closed "thick smoke valve", opened the "high valve", the high vacuum chamber of a stove or furnace.
Seven, when after the vacuity of the vacuum chamber of a stove or furnace to operations (vacuum gauge monitoring "J3" light up, pay attention to the initial monitoring set is higher, can set may be arrived at the required vacuum, heating) to open, open the heating and temperature control table with the initiative launched operation (heating curve should be ready in advance).
Eight, heating, heat preservation whole process has been completed, "process completed" alarm, together, closed heating the initiative.
Nine, if choose natural cooling, let vacuum furnace equipment remains the same, for natural cooling equipment to the melt temperature, closed "high valve", "dispersed pump" and "roots pump", leaving only "mechanical pump" and "the former valve" to vacuum pump "dispersion" and cooling. Together to beat knob to the "door open" position. In a closed vacuum gauge, opened the "manual vent valve", were deflated, stay in furnace pressure and atmospheric pressure balance, oven door open, can take is expected to tighten together "manual vent valve". To be scattered "pump" temperature cooled to room temperature (about one hour), can be closed "mechanical pump" and "the former valve". Closed water, electricity, gas. Finished the whole process.
Ten, such as selection of strong cold, in step 8, closed "gauge", "high valve", "thick smoke valve", "pump" scattered, leaving only "mechanical pump" and "the former valve" to spread to vacuum pump and cooling. "Charging valve" in turn, to the furnace into nitrogen maybe after argon to basic balance and atmospheric (with a pressure gauge control fan start testing point and inflatable limit testing point), open air cooler, until cool to melt temperature (strong cold air is in the process of active control). Enclosed the "charging valve. After cooling to the melt temperature, the knob to the "door open" position. And then unscrew the manual vent valve inflatable to balance and atmospheric, oven door opened, and then screw down the "manual vent valve". Then in the discharge. Closed water, electricity, gas. Finished the whole process.

In so doing, the vacuum brazing for longer service life

In so doing, the vacuum brazing for longer service life

1, according to the PLC program of low vacuum, closed all the double chamber vacuum valve of high-pressure gas quenching furnace, start the mechanical pump, after waiting for its running normally (about 1 to 2 min), open to the furnace of low vacuum valve disc valve, in advance of furnace smoke low vacuum;
2, according to the PLC program, high vacuum, open the valve disc, the diffusion pump suction, after 15 Pa under vacuum, the system automatically open to preheat diffusion pump, diffusion pump in about after 45 min started its function, can closed on disc valve, at the same time open the main stop valve for vacuum degree of 1.33 x 10 Pa, the samples can only open the heating button to heat.
Vacuum brazing maintenance guide equipment operators within the scope of responsibility of equipment point check parts, with the right inspection methods and tools based on the tally equipment daily maintenance cycle; The operator according to the daily maintenance manual fill in the heat treatment equipment daily maintenance records, and check by the team leader review, maintenance man to collect the archive. According to the technical requirements after the installation of complete equipment, perfect and has a good grounding, debugging and acceptance in accordance with the following items.

Maintenance of vacuum brazing furnace

Maintenance of vacuum brazing furnace

Continuously operating on a daily basis - with no filler metal with vacuum brazing furnace to various parts of the vacuum brazing furnace, inevitably lead to some vacuum brazing furnace charge fly all the damage to the heating elements and heat shield. If not timely maintenance, vacuum brazing furnace metal deposition, will soon be corrosion damage to the heating element, or produce local overheating, or make the heating system is broken one or more of the phase. That leads to the temperature of the inhomogeneity, in batch vacuum brazing furnace production, this kind of situation is often not noticed. Heating element of repair is the easy, it is not the same as heat insulation screen damage.
If heat insulation screen USES the key persons, as long as the screen with a thin layer of ink stone protection can make the vacuum brazing furnace metal splash damage down to the most. Vacuum brazing furnace metal and graphite surface wetting and bonding, not simply in the form of beads drops roll to the cold of the furnace area. After completion of these particles in a vacuum brazing furnace, also not harm can easily be removed.