Basic Info.
Type
Induction Heating Machine
Structure
Horizontal Type
Product Description
QSH-ZP vacuum medium frequency induction melting furnace is also called vacuum induction furnace, it is widely used for melting and ingot of special steel, high temperature alloy and precision alloy in vacuum or protective atmosphere, it is also an ideal tool for small vacuum precision casting.
| Technical Specifications |
| Max temperature | 1750oC |
| Max. Vacuum(Cold) | 6.67x10-3Pa |
| Max melting vacuum | 6.67x10-2Pa |
| Rated power | 100KW(Based on the actual production situation) |
| Rated voltage | 380V |
| Power frequency | 50HZ |
| Rated frequency | 1500~2500HZ |
| Leakage rate | ≤3.0Pa/h |
| Heat element | Induction copper coil |
| Temperature control | Power Temperature Control (Non-Programmable Temperature Control) |
| Temperature measuring device | Thermocouple |
| Power Supply | IGBT |
| Furnace Shell | Furnace Shell is a vertical cylinder with double layer and water-cooling. 304 stainless steel inner was mirror polished; the outer rolled by carbon steel. |
| Vacuum furnace shell | Furnace Shell is a vertical cylinder with double layer and water-cooling. 304 stainless steel inner was mirror polished; the outer rolled by carbon steel.
Double layer water-cooling arched furnace cover. Equipped with two tension springs, used to balance the weight. You can open the cover easily. Two tension springs can also provide furnace cover airtight pressure to ensure good sealing. |
Electrode
| The electrode is located in the left side of the furnace shell. It can work as a power supply for induction heater, and also can be as a fulcrum of induction heater and Crucible.
Electrodes mounted on Sealed bearing, when needed tilting crucible, worker can operate the handle to pour the liquid steel. |
| Alloy feeder | Alloy feeder is located in the center of the cover. Inside the feeder there are six cubicles (material of one cubicle is placed in the tipping bucket), the material can be fed into the melting crucible by outside operating handle.
When turning the feeder hand wheel every 60 degrees, there is one cubicle material fall into the tipping bucket inside the furnace cover.
Feeding tipping bucket is equipped with damping plate to prevent materials falls too quickly. To shake the joystick (outside the furnace cover) gently, you can control the speed and quantity of the material fall into the crucible |
Observation window
| The furnace cover is equipped with an observation window, easy to observe the performance of the furnace.
Active baffle plate is installed under the observation window, to prevent glass from burning broken and getting dirty by accumulation of metal steam.
Baffle plate moves away shortly only when observing, controlled by the handle outside the furnace cover. |
Induction heater
| Induction heater consists of a rectangular copper tube, through the two mating nuts fixed on the electrode, easy to disassemble.
Suitable crucible can be placed inside the heater. You can also make
the crucible according to the inductor inner wall. The material of crucible
is up to the melting metal.
In front of the melting crucible, and at the bottom of the furnace shell (where place the ingot mould), there is a circular pipe. On the pipe, there is a circular shelf to place ingot mould. Normally, ingot mould is placed on this shelf. When you need to cast the slender ingot, you can remove the shelf and put the ingot mould into the circular pipe, place it on the water-cooling cover. If you have some special needs, you can replace the water-cooling cover into a suitable water-cooling ingot mould. |
| Temperature measuring | On the right side of the furnace exhaust pipe, temperature measuring device is fitted. When you need to measure temperature, just pull up the spring latch, turn the handle, the thermocouple tip will insert in the liquid metal. Quartz protecting tube for thermocouple prepared by the user.
|
| Medium frequency power supply and Water-cooling | Medium frequency power is 1500-2500Hz. To compensate for low power factor, the system is equipped capacitor.
The medium frequency current of furnace was sent to inductor through the outside bus-tie and water-cooled medium frequency cable.Cooling water of medium frequency cable was directed by control valve on the furnace base. |
| Vacuum system | Vacuum system directly connect to exhaust port on the furnace shell. The system includes oil vapor diffusion pump, two stage rotary pump, valve, pipeline, etc.
The vacuum system has a 0-0.1Mpa pressure gauge, to check the rough vacuum and negative pressure of protective atmosphere. |
| Melting process |
| Step 1. Feeding | The materials must be carefully cleaned, removed surface contamination, oil, etc. and baked to remove moisture.
Some complex recycling materials must be cut off and removed surface scale, non-metallic materials, etc.
When feeding, you need to make sure the materials at the top of crucible is looser than the bottom. Use small piece of material to fill the gap. Place more regular shape material at the top to avoid "bridge concretion" during the melting. In the direction of tapping hole can amass some granular materials.
Feeding movements should be light to avoid crucible damage and slags in the metallic liquid. |
| Step 2. Vacuum pumping | Firstly, open the 2-stage rotary pump to vacuum the furnace. At the same time, open the diffusion pump power supply, start heating the diffusion pump oil. When the furnace vacuum reach 15Pa and diffusion pump have been heated for about 50 minutes, now you can close 2-stage rotary pump valve, open diffusion pump valve, vacuum the furnace to the required high vacuum. |
| Step 3. Melting | Firstly, open the thyristor medium frequency power supply, increase working voltage gradually through potentiometer. Normally, start with the small power and increase power slowly to avoid sharp temperature rising and vacuum dropped significantly.
The max power of furnace is subject to the medium frequency voltage and max current. |
| Step 4. Refining | After all materials melting, when to add alloy, you can turn the hand wheel. The alloy will drop into the feeding tipping bucket. Gently turn the operation handle, the alloy will drop into the crucible at the speed you need.
It's easy to cause sputtering when some alloy drop into the crucible. You need to pay attention to the speed of alloy's adding. It can't be too fast. Sometimes, you need to lower the power,make the liquid surface a bit harder, then adding the alloy to reduce sputtering. |
| Step 5. Casting | When refining complete, no need to cut off the power, tilt crucible to pour metallic liquid into ingot mould. Notice, do not pour it out of the ingot mould. |
| Maintenance |
| Cooling water | When melting, you should pay attention to cooling condition of each part. The temperature of cooling water should not over 50ºC. If the water pressure is inadequate or some part over temperature, you should cut off the power, find the reason and fix it, then restart. The hardness of water should not be too high, should be clean. Cooling water pressure: 0.2Mpa, water consumption: 3000kg/h.
When stop using the furnace for a while, you need to use compressed air to blow out the balanced water to prevent corrosion and extent service life. |
| Vacuum system | Replace the oil of diffusion pump and 2-stage rotary pump regularly. Add diffusion pump oil as lubricating oil to the seal parts regularly.
Pay attention to the heater of diffusion pump regularly. You can check if the heating wire is broken by measuring current.
When vacuuming steam-containing gas, you should open the gas ballast valve on the 2 stage rotary pump, or it will contaminate the oil in 2 stage rotary pump and lower the max vacuum. |
| Furnace | When stop using the furnace, you should clean the furnace inside and outside and vacuum it. |
FAQ:
Are you a manufacturer?
Yes, we have been manufacturing different models of furnaces for years.
What quality standard you have acquired?
All our products are CE approval.
Do you have your own R&D team?
Yes, we have R&D department, a group of retired personnels and highly educated expertise staff.
They will make the products perfect and design your requirements for free.
What information should i let you know if i want to get a quotation?
It's best for you to offer us the chamber size,temperature,etc.
How many days will the goods be finished?
Usually stocks are available.If stock finish,the standard sizes take one week to finish.
For non-standard sizes,60 working days after receiving the down payment.
Do you inspect the finished products?
Yes,each step of production and finished products will be carried out inspection by QC department before shipping.
How do you ship the products?
By sea;
By plane;
By couriers, DHL, TNT, Fedex, UPS, etc.
Note :Special furnace size is customizable. Better quality, Better service!
Address:
Room 304 Building 2 Nong 651 Dongming Road Pudong New Area Shanghai, Shanghai, China
Business Type:
Manufacturer/Factory
Business Range:
Auto, Motorcycle Parts & Accessories, Consumer Electronics, Industrial Equipment & Components, Instruments & Meters, Manufacturing & Processing Machinery, Metallurgy, Mineral & Energy, Tools & Hardware
Company Introduction:
Shanghai Alarge Furnace Co., Ltd is a professional manufacturer of high temperature furnaces and heating elements, which is engaged in R&D, producing and high temperature service for over than 10 years. We can offer strong technical and after-sale support to customers with our rich experience in high temperature field.
Our company own two factories, one is producing muffle furnace, tube furnace, crucible furnace, vacuum furnace and etc; Another is producing MoSi2 and SiC heating elements.
Based on our perfect technical team, all of our furnaces and heating elements can be customized.
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