Stamping forming and distribution characteristics of reducer

Using steel as raw material to produce the reducer, the part of the specifications of the reducer can also be used steel plate stamping forming technology is adopted to improve the production. Drawing die shapes used by reference to reducing tube surface size design, use after blanking punching die, stamping steel stretch forming.
The characteristics of stress distribution
(1) Under the action of the internal pressure, concentric reducer‘s size of terminal area pressure difference bending moments produced will cause to relatively open end, the small end of the relative shrinkage phenomenon.;
(2) the internal pressure under the action of eccentric reducer in central eccentric side inside the big end surface and eccentric side to the outer ring stress is the largest.
The use of eccentric reducer
When water absorption, water absorption section of the reduced pressure, gas will isolate was dissolved in the water, if the use is concentric reducer, these gases not discharge in time, will accumulate jams in the bumps, forming gas resistance. Pump will appear noise and carrying capacity drops greatly. If using eccentric reducer, isolate the gas discharge in time, will not form a vapor lock.
When reducing pipe diameter itself is not big, before and after the diameter difference is not big, with concentric reducer, possible gas resistance phenomenon is not so obvious, self-priming in the process of suction pressure change is not so big, so there was no harm.
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Stainless steel eccentric reducer in addition to the steel pipe as the raw material and what materials can be used

Stainless steel eccentric reducer besides using steel as raw material to produce reducer, reducer can also be used part of the specifications of the stainless steel stainless steel plate stamping forming technology is adopted to improve the production. Drawing die shapes used by reference to reducing tube surface size design, use after blanking punching die, stamping steel stretch forming.
1, when the fluid flow changes in stainless steel pipe, such as increasing or decreasing, velocity requirements haven’t changed much, must adopt stainless steel reducer.
2, and instrumentation, such as flow meter, the regulator shall, in order to cooperate with the joint of the instrument, also need to adopt stainless steel reducer.
3, the inlet of pump, in order to prevent cavitation, need to adopt stainless steel reducer.
Stainless steel reducer used in what place?
1, when the fluid flow in pipes have change, such as increasing or decreasing, velocity requirements haven’t changed much, all needs to use reducer.
2, the inlet of pump, in order to prevent cavitation, need to adopt stainless steel reducer.
3, and instrumentation, such as flow meter, the regulator shall, in order to cooperate with the joint of the instrument, also need to adopt stainless steel reducer.
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What are the trace elements in the stainless steel reducer

The iron element in stainless steel reducer by iron, steel, molybdenum steel materials, such as silicon, vanadium element materials.
The chemical composition of iron, steel material which occupies most of the position, and other basic material is the formation of iron and steel in this kind of material time will form a solid melting iron, after annealing the formation of a small amount of metal material.
Iron element if it is stainless steel material, then add the bearing in the cold will be thick impersonal, it certainly isn’t stainless steel iron, steel material is rough, stainless steel iron, steel materials are classified, simple said several Crl7, Cr25 Cr28 still has a lot of won’t go to the said.
Stainless steel reducer used in what place?
1, when the fluid flow in pipes have change, such as increasing or decreasing, velocity requirements haven’t changed much, all needs to use stainless steel reducer.
2, the inlet of pump, in order to prevent cavitation, requires a stainless steel reducer.
3, and instrumentation, such as flow meter, the regulator shall, in order to cooperate with the joint of the instrument, also need to use stainless steel reducer.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)

And what are the advantages of stainless steel tee than stainless steel reducer?

(1) compared with stainless steel tee, stainless steel reducer can not only change the piping, still can make for piping of different point of view, and can smooth tube medium flow, reduce the pressure drop and temperature drop.

(2) compared with the diameter stainless steel elbow, stainless steel reducer can not only absorb the heat-expansion and cold-contraction of displacement change, also can make the tube medium velocity change;

(3) stainless steel concentric reducer and stainless steel eccentric reducer under the premise of without changing for piping, can make the tube medium velocity change and flow smoothly;

(4) stainless steel reducing can add blind plate form head function.

The use of stainless steel eccentric reducer

When water absorption, water absorption section of the reduced pressure, gas will isolate was dissolved in the water, if use stainless steel concentric reducer, these gases not discharge in time, will accumulate \ jams in the bumps, forming gas resistance. Pump will appear noise and carrying capacity drops greatly. If use stainless steel eccentric reducer, isolate the gas discharge in time, will not form a vapor lock.

Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)

What should pay attention to when making stainless steel reducer

Forming hole diameter is less than stainless steel reducer big end diameter of the tube billet, used in die forming along the tube billet diameter hole enlargement. Hole enlargement technology mainly to solve the stainless steel reducer in the variable diameter is larger not easily by reducing forming, sometimes according to the requirements of the materials and products forming, expanding and reducing method of combination.
In the process of reducing or expanding deformation, according to different materials and variable diameter, determination by cold pressing and hot pressing. Under normal circumstances, as far as possible by cold pressing, but the multiple variable diameter and cause serious work hardening of the thick or alloy steel, wall thickness of materials appropriate USES hot pressing.
In addition to the use of stainless steel pipe as raw material to produce stainless steel reducer, the part of the specifications of the stainless steel reducer can also be used steel plate stamping forming technology is adopted to improve the production. Drawing die shapes used by reference to reducing tube surface size design, use after blanking punching die, stamping steel stretch forming.
stainless steel reducer used in what place?
1, when the fluid flow in stainless steel pipe have change, such as increasing or decreasing, velocity requirements haven’t changed much, all needs to use stainless steel reducer.
2, the inlet of pump, in order to prevent cavitation, requires a stainless steel reducer.
3, and instrumentation, such as flow meter, the regulator shall, in order to cooperate with the joint of the instrument, also need to use stainless steel reducer.
Source: Zhejiang Yaang Pipe Industry Co., Limited (www.yaang.com)

The processing technology of stainless steel reducer: reducing forming

Stainless steel eccentric reducer should not have crack, double skin appearance, wall thickness should be greater than the big diameter end section of the wall thickness. Roundness of stainless steel eccentric reducer should not be greater than 1% of the corresponding end diameter, and the allowable deviation of plus or minus 3 mm; Centerline should overlap on both ends of the stainless steel concentric reducer, the eccentric value allowable deviation is + / – 5 mm.
Reducing forming technology of stainless steel reducer is with eccentric head big end diameter equal to the size of the pipe into the forming mould, through along the axial direction of tube billet, shrink along the cavity movement and metal forming. Stainless steel reducer should not have crack, double skin appearance, wall thickness should be greater than the big diameter end section of the wall thickness. Centerline should overlap on both ends of the stainless steel reducer, the eccentric value allowable deviation is + / – 5 mm. According to the size of the stainless steel reducer, divided into the one of pressing or more press forming.
Stainless steel reducer stamping method
(1) because when stamping die to ensure the stamping precision of size and shape, and generally does not destroy the surface of the stamping parts quality, and the life of the mould are long, so the quality of stamping not disorderly, good compatibility, has the characteristics of “the same”.
(2) stamping, generally no chip broken material naturally, less material consumption, and do not need other heating equipment, it is a kind of material, machining method of energy saving, stamping parts of the capital is low.
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The application range of the stainless steel reducer

The application range of the stainless steel reducer:
A, mine, the application of the coal industry
(1) mine: mining, ore concentrate and tailings filling transported to tube wear serious, using kuangfen pipelines such as panzhihua, daye mine service life is less than a year, to increase the tube can make the life.
(2) coal: coal preparation and long distance pipeline of wet method widely used coal conveying, requires the duct is wear resistant and corrosion resistant, using the tube can be used as a long duct, considerable economic benefit.
The application of the two, metallurgy, electric power industry
Conveying of pulverized coal, metallurgy, electric power industry ash, mud and lime gypsum slurry every year to spend a lot of metal pipe. By using ceramic pipe to replace other pipe has high wear resistance, long service life, easy installation, the economic benefit is remarkable characteristic.
The concentric reducer arc length calculation method
Launches the arc length calculation methods of stainless steel concentric reducer topic related data in combination with our company for stainless steel reducer (stainless steel eccentric reducer, stainless steel concentric reducer, size of the stainless steel reducer), arc length calculation method of stainless steel concentric reducer carried out by the subject has its own unique insights, here are our views on the subject of his own point, the hope can help you. Stainless steel concentric reducer, a big head radius for R1, capitulum radius R2, high for H, these three data on the sheet metal drawing is known. For the convenience of calculation, a big circular arc radius for RD, an Angle for alpha, small head of the radius of the circular arc for RX, (R1, R2) = Δ (R), L size for the length of the lateral projection.
(RD – RX) = L = [(H) ^ 2 + (Δ R ^ 2) ^ (0.5)
RD = (R1 * L) present Δ (R),
RX = (R2 * L) present Δ (R),

An Angle for alpha = [180 x (Δ R)] present (L (PI), unit is degree.

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Hot bending method for stainless steel pipe fittings

Stainless steel pipe fittings in heating condition, to bend called hot bending. The bending of the stainless steel pipe fittings and can be divided into sand filling without buckling of hot bending and buckling is not filling sand hot bending.
Without buckling filling sand hot bending under applicable to D400mm stainless steel pipe fittings, the bending radius R > 3.5 D,. Its main operations include line filling sand heating, cooling and heat treatment, etc.
(1) stainless steel pipe’s line pipe crossing is usually marked with white chalk or white paint mark. L, when a is in the bend, the fixed with two block string (bolt) ask, D, < l50mm stainless steel pipe fittings, L1 should be not less than 500 mm, D > l50mm stainless steel pipe fittings, L1 should be not less than 600 mm, L the length of the stainless steel pipe fittings heating bending part.
(2) the sand filling,  tube filling sand within the purpose is to prevent the stainless steel pipe fittings elliptic or buckling when bending. At the same time, in the sand heating can save big when the quantity of heat, can extend the time of bend pipe.
Sand should be clean screen and drying, to particle size also to have certain requirements. Before filling sand, stainless steel pipe fittings at one end of the plug with length to diameter 1.2 ~ 2 times. About 25 of taper conical dry wood heart can also use the steel seal or use the steel plate welding seal), and then sucked straight stainless steel pipe fittings, with one end of the cork on the ground, with a special filling sand and sand filling equipment or manual with funnel will move into the tube. Each pack sand filling height 300 ~ 400 mm, with iron bars or vibrators outside the tube walls of beat vibration, the packed sand strong. After filling sand, in the top of the stainless steel pipe fittings to also want to break into a cork, and cork must come into contact with the tube of the sand.
(3) stainless steel pipe fittings of commonly used heating pipe, heating furnace, heating gu, used for carbon SuoGang with coke or anthracite, the brass and alloy steel pipe, appropriate USES charcoal for aluminum tube with coke. Bituminous coal tender material it is forbidden to use it, for the bituminous coal contain harmful impurities such as sulfur, phosphorus, heating will penetrate into pipe fittings surface of metal in the organization, and make the pipes become fragile.
Heating pipe, should be assorted child need ah song over the toe in the flame of uniform, do not turn the pipe when heated evenly. Depending on the types of pipes and heating temperature, the carbon steel pipe is 950 ~ 1000 ℃ (i.e., to pink or orange), of low alloy steel pipe is 1050 ℃, the nickel and chromium stainless steel tube is 1100 ~ 200 ℃, the copper pipe is 400 ~ 500 ℃, the aluminium tube is 300 ~ 400 ℃ when the stainless steel pipe fittings and the sand are all reach the heating temperature, should immediately remove the pipe bending.
(4) Platform has two kinds of concrete and cast iron. Fixed platform soil has a steel bolt, sample or model. Better stainless steel pipe fittings of heating on the platform quickly, end between steel bolt, the other end is in 3 ~ 5 seven hand dumpling or electric car hinge for wire rope tied bent stainless steel pipe fittings, smooth stretch bending speed should be uniform. Tended to be slightly stainless steel pipe fittings for cooling after bending springback straightened (3 ~ 5 °), so when bend bend more than sample 3 ~ 5 °, or taken into account when making sample.
(5) the cooling of the stainless steel pipe fittings and desanding tube bending, buried in the hot sand or asbestos dust, best to make it slow cooling. After being the pipe cooling, will empty tube sand, remove residual burning in the sand, with compressed air blowing off again, finally check its curved shape and any other defects.
(6) stainless steel pipe fittings after heat treatment of carbon steel pipe bending generally don’t need to heat treatment, but for the higher working pressure pipe bending best annealing treatment, in order to eliminate the internal stress generated when the bend. Annealing method is generally around the bend heated to 600 ℃, slow cooling in the air again can. For alloy steel tube, should for normalizing and tempering treatment, in order to improve the microstructure and stress relief.

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Cold bending method of the most common stainless steel pipe fittings

D 150 mm stainless steel pipe fittings or less, because the stainless steel pipe bending without heating, the stainless steel tube bending aluminum pipe and copper pipe, cold bending heat is more appropriate.
Stainless steel pipe fittings’ cold bending processing, tube don’t need to pack sand (except for larger diameter and wall thinner), usually conducted on manual or motorized pipe bender.
When the stainless steel pipe outside diameter greater than 60 mm must be placed in the tube bending mandrel bending. Outside the mandrel margin is smaller than stainless steel pipe diameter 1 ~ l. 5 mm, on stainless steel pipe fittings began to bend and slightly forward. Ball part of the heart library boundary with cylindrical part should always keep in the beginning of the stainless steel pipe fitting curved surface. If the mandrel stretched out before, is likely to make the mandrel fracturing; Without mandrel to position, and stainless steel pipe fittings causes excessive ovality.
A large number of bent pipe, use the motor tube bending machine.
Stainless steel pipe fittings is one of the books to parts of piping, it originated in the connection between tube and tube and the turning of pipe, branch, variable diameter, or closed, and then the pipe installation and maintenance (such as union).
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Thread step and methods of stainless steel pipe fittings

Thread step and methods of stainless steel pipe fittings are as follows:
The thread sets before the first choice corresponds to the diameter of the die, according to sequence number 4 will die to turn into the hinge plate die chamber. Prior to loading, pay attention to the hinge plate on the iron sweep.
The pipe clamp is clamped firmly on the stainless steel pipe fittings, the stainless steel pipe fittings are in a horizontal state, and the pipe ends extend out of the pipe pressing pliers about 150mm. There shall be no attention orifice oval, oblique mouth, burr and flaring defects.
3 after the card claws sliding handle 9 release, the hinge plate is sheathed in the pipe, then turn the rear clamping claws sliding handle, hinge plate fixed on the end of stainless steel pipe fittings, die elastic handle 6 to the end, and the activities of the underlying disk 4 alignment fixed disc 2 with diameter corresponding to the scale, make them coincide with diameter, final tightening standard disc fixed handle 5.
(4) operation, the first station at the end of the tube of front side, facing the pressure of pipe clamp, legs a splayed, hand pressed hinge plate, and force to move forward, the other hand holding the handle 7, according to a clockwise direction pulled the hinge plate until the hinge plate after wearing buckle pipe, then going sideways station in pressure pipe clamp side, a handle is wrenched. Manual stainless steel pipe fittings.
Fifthly, began to thread sleeve, action should be slow, steady, operator attention to coordinate with each other, not overexert, so as not to set the thread and the stainless steel pipe fitting misalignment caused by eating buckle, partial deduction, to be set into the two buckle, for lubricating and cooling die, to continuously to the cutting position drops into the lubricating oil.
The set of process in depth should not be too deep, set end again, adjust a subscript disk, increase the amount of feed, and then set it again. General requirements: nun DN25 within the stainless steel pipe fittings, can be a set of screw: DN25 ~ DN40mm of stainless steel pipe fittings, should be set into the two times; DN50nuin more than the stainless steel pipe fittings, to be divided into 3 sets of the system.
Seventhly, the handle is wrenched, the best is operated by two people, action to coordinate, so that not only the operation is labor-saving and avoid defects of the generating set of the thread and the stainless steel pipe fitting are not concentric. Set DN 15 ~ DN20n. Stainless steel pipe fittings, a can be wrenching 90 sets of slightly larger diameter pipe thread, a wrenching 60 degrees, set of DN50nuii or above DN50nuii stainless steel pipe fittings, depending on the actual need to increase manpower, but also to increase the number of pull.
And eighthly, when processing thread to close to the specified length, side pulled the handle 7, one side should be slowly loosen die elastic handle 6, and release side edge of a 2 – 3 deduction, to make thread the end of a set of a taper.
To set the thread exit end hinge plate, the hinge plate shall not reverse back, so as not to damage the die and thread or cause arbitrary deduction.
The threaded sleeve is good, with connections to try, with 2 to 3 hand can be screwed into the buckle. Such as that of the screw loose, connected after the poor tightness and thread quickly by medium corrosion of stainless steel pipe fittings; as of the thread tight, connection, easy to burst pipes, or because most of the pipe thread dew in outside of the pipe, and reduce the coupling strength. The requirements of high tightness under the condition of gradually available method of releasing die elastic handle, increase the thread taper.
Electric) set of filaments, “short silk” and “crooked wire,, filament, generally used for radiator and the stainless steel pipe fitting pipe connected, at one end of the short thread, at the other end of the short thread 2.5 to 3 times the long thread, do not need to any taper.
Stainless steel pipe screwed into the plate clamping wire “short silk head”, also known as Lady Gaga, is refers to the length of less than 100mm, at both ends of the threaded tube, so short to the tube clamp pressure, is not by the hinge sleeve thread: this can be the first in a long stainless steel pipe fittings of a short thread, then according to the length of the section is a short thread pipe head, and the threaded end is connected with a pipe hoop stainless steel pipe, and then connected with a pipe hoop stainless steel pipe is fixed on the bench, so that you can in a short tube at the other end of a thread: finally, the both ends of a thread tube removed, “short silk head” set of finished.

In installation of stainless steel pipe fittings, when the branch for slope, and in case of connection thread is not correct, sets of threads corresponding skew, commonly known as “twisted wire. Crooked wire the maximum not more than 15 DEG crooked wire “set of method is: hinge plate set into the one, two button, the card claw handle according to the need of skewness slightly loosen the standard disc to the side of the inclined cutting can be.

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