HOT INFORMATION / More
1
2018 - 07 - 13
Although the spring industry is a small industry in the whole manufacturing industry, its role must not be underestimated. The industrial manufacturing industry and the automobile industry in the country should accelerate the development, and the spring industry, as one of the basic parts and parts, needs to have a development over the early stage to adapt to the rapid development of the country's whole industry. In addition, the expansion of the spring product variety and the improvement of the quality level are also the needs of the replacement of machinery and equipment and the imp...
2
2018 - 07 - 31
8.3.3 test machine should have the following functions: test time or preset function;Dynamic timing or counting function; test amplitude display or control function; automatic stop function.Evaluation of 8.4 spring fatigue test results8.4.1 fatigue life determination: under a given failure condition, the measured spring reachesThe maximum cycle number is the fatigue life of the spring.Verification of 8.4.2 fatigue life: if the number of cycles is tested, if the spring does not failThe validation test proved that the test was passed.8.4.3 reliability verification: according to the given reliabi...
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2018 - 08 - 14
(4) the development of stainless steelChina is a big country in the production of stainless steel. With the production and development of stainless steel, many varieties have been developed naturally. At present, more than 50 kinds of stainless steel have been developed, which basically meet the needs of domestic production and development, and a brief description of some new varieties developed at present.1) the initial formation of austenitic stainless steel system. Low carbon austenitic stainless steel 0Cr18Ni9 and 00Cr17Ni2Mo2 have been developed to eliminate fatigue corrosion caused by ca...
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2018 - 08 - 25
Like most other basic mechanisms, metal springs have existed for a long time in the bronze age. Even for metals, wood is used as a structural member of flexible bow and arrow and military catapult. In the Renaissance, precise clocks made precision springs the first necessity. In Fourteenth Century, we saw the precise clock of revolutionary astronomical navigation developed. The world's exploration and conquest of European colonial powers continue to provide impetus for watchmakers "science and art." The other area of the firearm promotes the development of the spring. At the dawn...
5
2018 - 09 - 10
The corrosion of spring can be divided into chemical corrosion and electrochemical corrosion according to the type of reaction.They are the result of changes in the metal atoms on the surface of the spring or the loss of electrons to an ionic state.If the metal on the surface of the spring simply reacts with the surrounding medium, and the spring causes corrosion, it is called chemical corrosion.For example, the spring is oxidized in the particularly dry atmosphere to form an oxidation film, and the spring is chemically changed with the liquid or impurity in the non-electrolyte liquid, which i...
6
2018 - 09 - 21
Compression springs are frequently seen and used in daily life. The main principle of compression springs is to provide a hand to the machine and drive it to work.The compression spring has a certain damping capacity, because the product's elastic force is not a fixed value, so every time it is used, there will be a return force, and the force is not a fixed size, which to some extent has the ability to slow down the vibration.As an example, now the car is installed above a compression spring, you will find when driving, its speed is greatly improved, and the movement process there is no s...
7
2018 - 10 - 08
The oxidation treatment of the spring (also known as bluish, blackened, cooked black, etc.) is mainly used to prevent the corrosion of the spring, and also to make the spring appearance bright.Oxidation treatment methods include: alkaline oxidation, alkali free oxidation and electrolytic oxidation.Spring oxidation treatment is often alkaline oxidation treatment, in the presence of oxidants (such as sodium nitrite) in caustic sodium solution.As the solution approaches the boiling point, the iron on the surface of the spring dissolves and forms sodium ferrite and sodium ferrite, which is then ma...
8
2018 - 10 - 18
For a long time, the shape and performance of the extension spring will change. If the extension spring is always in a certain situation, it may change its quality due to external conditions.Generally, there are the following situations:I. wear of extension spring :Wear can be divided into abrasive, fatigue and corrosion wear fracture.Ii. Brittle fractureThe majority of spring break belongs to brittle fracture.Plastic fracture is possible only when the working temperature is high.In engineering, fatigue fracture, stress corrosion fracture and hydrogen embrittlement fracture are called brittle ...
9
2018 - 11 - 01
1) make it clear whether to use raw drawn steel wire or lead hardened steel wire;2) propose the requirements of steel wire diameter, strength grade (group) and standard number (select according to table 1.1);3) if there are special requirements such as strength and diameter allowable error, etc. (standard parameters are in parts 2 and 3);4) special packaging and marking requirements (see 1.4);5) carbon steel spring suitable for long-term work under the condition of temperature 121 ℃, highest working temperature should be chosen alloy spring steel.3 special needsShaped cross section: square, re...
NEW INFORMATION / More
1
2018 - 07 - 16
Torsional springs are a kind of helical springs, which mainly produce torque or rotational force. The end of the torsion spring is fixed to other components. When other components rotate around the center of the spring, the spring pullback them back to the initial position. Although this spring is called torsion spring, it is subject to bending stress rather than torsional stress. The torsion spring can store and release angular energy or fix a device in a static way by rotating the force arm around the middle axis of the spring body. Torsion springs are usually tight, but there is pitch betwe...
2
2018 - 08 - 08
Springs can also be classified by how they’re made. The first spring that comes to most people’s minds is probably a metal coil spring, also known as a helical spring. However, there are many other types. Even an elastic band can be considered a variable rate spring, since it stores mechanical energy. Coil SpringsLightweight coil springs are made by forming metal wires on an CNC coiling machine. The multi-axis CNC control allows you to create variable pitches and end conditions only limited by your imagination. Springs that come off the coiling machines do not have springy properties. They nee...
3
2018 - 08 - 21
Like most other basic mechanisms, metal springs have existed for a long time in the bronze age. Even for metals, wood is used as a structural member of flexible bow and arrow and military catapult. In the Renaissance, precise clocks made precision springs the first necessity. In Fourteenth Century, we saw the precise clock of revolutionary astronomical navigation developed. The world's exploration and conquest of European colonial powers continue to provide impetus for watchmakers "science and art." The other area of the firearm promotes the development of the spring. At the dawn...
4
2018 - 09 - 06
The technological process of helical springs refers to the process of converting spring materials into finished springs, which flow through every process in sequence. Because of the spring material, the spring type and the processing method are different, the technological procedures of the spiral spring are also different. However, their basic technological processes are coil spring heat treatment end processing surface treatment.Next, introduce several typical processes.1. manufacturing compressed spiral spring with cold drawn spring steel wireFor the lathe coil spring, after the winding spr...
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2018 - 09 - 18
Osmosis detection will be the basic principle of the spring of dip coating (penetrant) some penetration ability of the solution, the infiltration of surface defects, and then to remove excess penetrant, appeared in the surface layer of the tu yi agent again, at this point defects remaining in the penetrant sucked out, under the purple pay-off (fluorescence) observation or direct observation, can be found that the existence of defects.Osmotic detection can be used for the detection of ferromagnetic springs as well as non-ferromagnetic materials such as copper alloy and austenitic stainless stee...
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2018 - 09 - 28
The special-shaped spring contains spring clip, tension spring and torsion spring, and the generalized special-shaped spring also includes snake spring, corrugated spring, bar spring and other complicated springs.Special-shaped spring is the basic part with wide application range and multifarious variety in automobile, motorcycle, electric appliance and instrument products. Its quality and life directly affect the performance of main engine products.Hyundai has made it a key component.Over 90% of special-shaped springs at home and abroad are made of two kinds of materials: lead quenched carbon...
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2018 - 10 - 15
There are three ways to use stainless steel spring to remove oil and oxide skin:1. Immerse the stainless steel spring into the plastic container with the metal cleaning agent A diluted with water (the proportion of cleaning agent A and water dilution is 1:1 or 1:2), and the time should be as follows: the spring surface should be free from oil and oxide skin to restore the metal color. The soaking time should not be too long.So stainless steel spring surface has matte effect.2. In the ultrasonic equipment, the proportion of cleaning agent and water is about 1:30. It is advisable to restore the ...
8
2018 - 10 - 25
The spring relief valve is mainly composed of spool, seat, stem, spring and adjusting screw.The relief valve mainly USES spring force to press the spool on the seat.When the boiler pressure exceeds the pressure exerted by the spring on the upper part of the spool, the spool and stem are lifted and steam is discharged.When the boiler pressure is lower than the spring pressure acting on the upper part of the spool, the spool falls on the seat and the boiler stops discharging steam.The spool is a cone with a slight protrusion around the edge of the spool.When the steam opens the valve core, the e...
9
2019 - 12 - 23
Medical springs are an important component in the manufacturing of devices and equipment used throughout the medical industry. The three main types of springs used in medical devices—compression, torsion, and extension—and each serve a valuable purpose in varying types of equipment, large and small.Springs are devices that store mechanical energy. Though they are relatively simple in design, they are ubiquitous components in all kinds of devices and machines in a wide range of products from medical devices and equipment to consumer goods and heavy industrial equipment. Nearly anythin...
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The chemical protective layer of the spring

日期: 2018-10-17
浏览次数: 300
Daisy

A compact protective film is formed on the surface of the spring by chemical reaction to prevent the corrosion of the spring.Generally, oxidation treatment and phosphating treatment are used.

Oxidation treatment and phosphating treatment have low cost and high production efficiency. Generally, spring manufacturers adopt oxidation treatment as corrosion prevention treatment.

1.Oxidation treatment of steel is also known as bluing, blackening and boiling black.After oxidation treatment, the surface of the spring produces protective magnetic iron oxide, which is generally blue or black or sometimes dark brown.The color depends on the surface state of the spring, the chemical composition of the spring material and the oxidation process.The chemical protective layer of the spring

The methods of oxidation treatment include alkaline oxidation, alkali free oxidation and electrolytic oxidation.Use alkaline oxidation method is much.

Alkaline oxidation will spring into the temperature about 140 ℃, the sodium hydroxide solution of oxidant soaking in a certain time, oxidant and sodium hydroxide with iron, ferrous generate acid sodium and sodium, iron reacts to each other, to generate the magnetic iron oxide.

The thickness of the oxide film is about 0.6 ~ 2 / negative m.Although the oxide film can improve the corrosion resistance of the spring, it has poor protective ability due to its thin film and air hole, so it can only be used for the spring in the medium with weak corrosion.The anti-corrosion property depends on the density and thickness of the oxide film, which is determined by the concentration of sodium hydroxide, the concentration of oxidant and the temperature of the solution.

In order to improve the corrosion resistance and lubrication ability of the oxide film, the treatment before and after oxidation treatment should be strengthened.Prior to the oxidation treatment, the spring surface rust, oxide skin, oil pollution, heat treatment of salt slag, surface contact copper layer and so on to be thoroughly cleared.After oxidation treatment, the spring is usually filled in soap solution or bichromate solution, and then washed, blown dry or dried with flowing warm water. Finally, the rust prevention oil or mechanical oil at a certain temperature is replaced by the water film for immersion treatment.

The surface grain boundary of some hot-rolled spring materials has been eroded by oxidation treatment, which can reduce fatigue strength to a certain extent. Therefore, care should be taken when using oxidation treatment.

Conventional oxidation treatments require heating.In recent years, some domestic manufacturers also use room temperature blackening agent, which overcomes the defect of traditional blackening process and saves a lot of energy.

Blackening agent is blue and green concentrated liquid, no impurity, no odor, no fire, no explosion, no corrosion, transport safety.

The dilution of the blackening agent with water is about 1:5.

The operation process of blackening agent is relatively simple, and its process route is as follows: degreasing, rinsing, pickling, rinsing, blackening (2-5min at room temperature), rinsing, water film replacement anti-rust oil.It should be noted that the spring workpiece must be thoroughly cleaned of the oil, and then put into room temperature blackening agent for oxidation treatment.

Oxidation treatment has low cost, simple process formulation, high production efficiency, and a certain elasticity of the oxide film, which basically does not affect the spring characteristic curve. Therefore, oxidation treatment is widely used as the anti-corrosion and decoration measures of cold-formed spiral spring, spring washer and sheet spring.

The quality inspection of the spring after oxidation treatment includes appearance inspection and corrosion resistance inspection.

2.The process of phosphating a spring into a phosphate solution containing manganese, iron, and zinc to form a layer of water-insoluble phosphate film on the metal surface is called phosphating.The appearance of phosphating film is dark gray, gray or black gray, not shiny.The thickness of the phosphating film is usually 5-20 / pressure m.Phosphating film is stable under general atmospheric conditions, and its corrosion resistance is 2 ~ 10 times of that of bluing film.Phosphating film has micropore structure and good adsorption capacity for paint and oil.After phosphating, dichromate filling, oil soaking or painting can further improve its corrosion resistance.Phosphating film is stable in animal oil, vegetable oil and mineral oil, and also stable in some organic solutions (such as benzene and toluene).

Phosphating film can withstand temperatures up to 400 ~ 500 ℃, as a result, some of the work under the high temperature of the spring, such as shell part of spring that common phosphating treatment.

The spring had better be sandblasted before phosphating.After sandblasting, the tongue should not be left for too long and should be phosphated immediately.If there is no sandblasting equipment, chemical oil removal and pickling can also be used to remove oil.The phosphating spring produces a lot of hydrogen in the process of phosphating, so the phosphating spring has hydrogen embrittlement.For the key part of the spring, after phosphating treatment should be dehydrogenated.


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