News

Heat Treatment Furnace Types

Heat Treatment Furnace Types   Furnaces used for heat treatment can be split into two broad categories, batch furnaces and continuous furnaces. Batch furnaces are usually manually loaded and unloaded where continuous furnaces have an automatic conveying system to provide a constant load into the furnace chamber.   Batch Furnaces Batch systems usually consist of an insulated chamber with a steel shell, a heating system, and an access door to the chamber.   Box-type Furnace Many basic box type furnaces have been upgraded to a semi-continuous batch furnace with the addition of integrated quench tanks and slow-cool chambers. These upgraded furnaces are a very commonly used piece of equipment for heat-treating.   Car-type Furnace Also known as a “bogie hearth”, the car furnace is an extremely large batch furnace. The floor is constructed as an insulated movable car that is moved in and out of the furnace for loading and unloading. The car is usually sealed using sand seals or solid seals when in position. Due to the difficulty in getting a sufficient seal, car furnaces are usually used for non-atmosphere processes.   Elevator-type Furnace   Fluidised bed heat treatment line Similar in type to the car furnace, except that the car and hearth are rolled into position beneath the furnace and raised by means of a motor driven mechanism. Elevator furnaces can handle large heavy loads and often eliminate the need for any external cranes and transfer mechanisms.   Bell-type Furnace Bell furnaces have removable covers called “bells”, which are lowered over the load and hearth by crane. An inner bell is placed over the hearth and sealed to supply a protective atmosphere. An outer bell is the lowered to provide the heat supply.   Pit Furnaces Furnaces which are constructed in a pit and extend to floor level or slightly above are called pit furnaces. Workpieces can be suspended from fixtures, held in baskets or placed on bases in the furnace. Pit furnaces are suited to heating long tubes, shafts and rods by holding them in a vertical position. This manner of loading provides minimal distortion.   Salt Bath Furnaces Salt baths are used in a wide variety of heat treatment processes including neutral hardening, liquid carburising, liquid nitriding, austempering, martempering and tempering.   Parts are loaded into a pot of molten salt where they are heated by conduction, giving a very readily available source of heat. The […]

Read More

Welding Neck Flange

Welding Neck flange Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting. The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces. These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection. This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld). The high quality and cost effective Welding Neck Flange can be produced by Guokun Machinery. If need, please contact with us. gina@guokuncasting.com or gina.guokun@gmail.com Other Flange we produced: Type: Indurtrial pipe flange, blind flange, wled-neck flange, slip-on flange, socket weld flange, lap-joint flange, threaded flange, steel casted flange,  etc Process: Investment casting, sand casting, silica sol casting, lost wax casting, close die forging, mould forging, precision machining, welding, etc Material: carbon steel, alloy steel, stainless steel, brass, plastic, etc

Thread Flange

Threaded Flanges are used for special circumstances with their main advantage being that they can be attached to the pipe without welding. Sometimes a seal weld is also used in conjunction with the threaded connection. Although still available in most sizes and pressure ratings, screwed fittings today are used almost exclusively in smaller pipe sizes. A threaded flange or fitting is not suitable for a pipe system with thin wall thickness, because cutting thread on a pipe is not possible. Thus, thicker wall thickness must be chosen…what is thicker ? ASME B31.3 Piping Guide says: Where steel pipe is threaded and used for steam service above 250 psi or for water service above 100 psi with water temperatures above 220° F, the pipe shall be seamless and have a thickness at least equal to schedule 80 of ASME B36.10. Other Flange we produced: Type: Indurtrial pipe flange, blind flange, wled-neck flange, slip-on flange, socket weld flange, lap-joint flange, threaded flange, steel casted flange,  etc Process: Investment casting, sand casting, silica sol casting, lost wax casting, close die forging, mould forging, precision machining, welding, etc Material: carbon steel, alloy steel, stainless steel, brass, plastic, etc If need high quality and cost effective Industrial Pipe Flange, please contact us via gina@guokuncasting.com or gina.guokun@gmail.com

Slip-on Flange

Slip On flange The calculated strength from a Slip On flange under internal pressure is of the order of two-thirds that of Welding Neck flanges, and their life under fatigue is about one-third that of the latter. The connection with the pipe is done with 2 fillet welds, as well at the outside as also at the inside of the flange. The X measure on the image, are approximately: Wall thickness of pipe + 3 mm. This space is necessary, to do not damage the flange face, during the welding process. A disadvantage of the flange is, that principle always firstly a pipe must be welded and then just a fitting. A combination of flange and elbow or flange and tee is not possible, because named fittings have not a straight end, that complete slid in the Slip On flange. Other Flange we produced: Type: Indurtrial pipe flange, blind flange, wled-neck flange, slip-on flange, socket weld flange, lap-joint flange, threaded flange, etc Process: Investment casting, sand casting, silica sol casting, water glass casting, lost wax casting, close die forging, mould forging, precision machining, welding, etc Material: carbon steel, alloy steel, stainless steel, brass, plastic, etc If need high quality and cost effective Industrial Pipe Flange, please contact us via gina@guokuncasting.com or gina.guokun@gmail.com

Water Glass Castings

Water glass casting process Water glass casting is one of investment casting process, in which water glass is added into the molding materials in proportion and then gets stirred and mixed for 6-8 min, then grind into “ sodium silicate-bonded sand”. Then the sand is put into the mold boxes in which CO2 has been much blown into. CO2 starts the chemical reaction with the water glass to from the silica gel which hardens the sodium silicate-bonded sand. Why choose water glass casting for your customized parts? The water glass casting parts is the most cost-effective casting process with short shell making cycles, which helping you to cut a lot costs. Compared with silica sol casting parts, water glass casting components is with large surface roughness and low dimension accuracy. The surface quality of investment water glass casting parts is poor, so it is mainly used for carbon steel and low alloy steel castings. And the silica sol precision casting is mainly used for high-alloy steel and stainless steel products. Application: China water glass castings is widely applied throughout all kinds machinery, such as automotive castings, engineering machinery casting, agricultural casting parts, motor casting components, elevator casted parts, mining parts, earthmoving machinery casting components, construction machinery casting parts,  marine & ship casting, pump fittings, hydraculic cyclinder castings, valve casting spare parts and various metal casting. Baoding Guokun Machinery Co., Ltd is A high quality China foundry, mainly manufacture the investment casting, precision casting, lost wax casting, silica sol casting, resin sand casting, green sand casting, shell mold casting, hot forging and cnc precision machining process for all your needs!

1 … 14 15 16 17 18 … 20