您现在的位置： Home → News → Industry news

HOT INFORMATION / More

How to protect the surface of the spring?

2018 - 07 - 25

Core tip: the surface of spring can be generally treated, such as blackening (blue), phosphating, electroplating, spray molding, etc. In recent years, the zinc chromium film dacroa DACROMET dacroa protective layer has excellent corrosion resistance, which is 710 times the corrosion resistance of the traditional electroplating layer, and there is no hydrogen embrittlement in the electroplating process. Generally, the surface of springs can be treated, such as blackening (blue), phosphating, electroplating, spray molding, etc. In recent years, the zinc chromium film "dacrom DACROMET da...

What is the fall of autumn?

2018 - 08 - 07

What is the fall of autumn?The fall of autumn, the thirteenth throttle of the twenty-four solar calendar in the lunar calendar, is the first throttle of autumn, marking the official start of the season of Meng Qiu: "autumn" means the summer to cool. By the beginning of autumn, the Chinese parasol trees began to shed their leaves. From the point of view of writing, the word "Qiu" is composed of grass and fire characters. Autumn is a transitional season from hot to cool and then from cold to cold.The fall of autumn, July. A word can be found in spring. Autumn is the same.At t...

Inspection content and specification for spring parts(part 6)

2018 - 08 - 17

8, detection of fatigue property and relaxation rate of spring8.1 spring fatigue performance testing requirements: the spring that bears the variable load is in the internal quality of the enterprise.Quantity control, user inspection, new product certification, certification, industry sampling and process adjustment.In the ring section, the fatigue performance must be tested. The testing method can be tested by fatigue life testThere are two kinds of certificate test or reliability evaluation test, but they are classified and certified for products.Reliability evaluation test must be adopted t...

What is the cleaning and cleaning of stainless steel springs?

2018 - 09 - 03

In order to remove the detergent, wash the surface with clean water at the end of washing.Surface condition and washing methodDust and easy to remove dirt - wash with soap, weak lotion or warm water.Label and film: scrub with warm water and weak detergent.Binder composition - using alcohol or organic solution;Fat, oil, lubricating oil contamination - with a soft cloth or paper after drying with a neutral detergent or ammonia solution or special detergent to wash;Bleaching agent and seed acid adherence - immediately rinse with water, soak in ammonia or neutral soda solution, then wash with neut...

Knowledge of metal structure and heat treatment

2018 - 09 - 17

(1) metal tissue1. Metal: it has good thermal and electrical conductivity with opaque and metallic luster, and its electrical conductivity decreases with the increase of temperature, and it is rich in ductility and malleability.A solid (or crystal) in which the atoms of a metal are regularly arranged.2. Alloy: a substance which is composed of two or more metals or metals and non-metals and has metal properties.3. Phase: components with the same composition, structure and performance in the alloy.Solid solution: an atom (compound) of one (or several) element dissolves into the lattice of anothe...

Spring not in place and failure reasons

2018 - 09 - 27

In the actual work, we often encounter that the spring cannot push the moving object to the set position, that is to say, the length of the spring's computational freedom becomes shorter.The main reason is that there is no initial compression, that is, a spring is made into a spring, which is compressed to its compression height or to its compression height (if necessary) with a greater force, and cannot be restored to its original free length upon release.Its shortened quantity is called "initial compression quantity".After repeating 3-6 times of compression, the length is no lo...

Overview of spring surface treatment

2018 - 10 - 12

The spring is often corroded by the surrounding medium in the process of manufacture, storage and use.As the spring works under the influence of the spring force, the spring force will change and lose its function after being corroded.Therefore, preventing the corrosion of the spring can guarantee the stability of the spring and extend its service life.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 st...

Working characteristics of compressure spring

2018 - 10 - 23

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 calle...

Torsion Spring Performance

2019 - 12 - 16

Put simply, the most important factors of torsion spring performance are spring rate deflection, load capacity, and wind. In a torsion spring, spring rate accounts for the return of angular torque per unit of angular displacement. Deflection is the amount that the spring resists pressure before overstressing itself and becoming damaged (bent), and the wind is simply how the spring is wound, be it right (clockwise), left (counterclockwise), or with double torsion.torsion springThe following is the necessary information of a torsion spring:(1) control diameter: (a) outer diameter, (b) ...

NEW INFORMATION / More

Summary of spring parameters and symbols (Part 2)

2018 - 08 - 01

The basic spring parameters of the spring:1. Spring wire diameter D: wire diameter of spring.2. The outer diameter of the spring D2: the maximum outer diameter of the spring.3. The inner diameter of the spring D1: the smallest outer diameter of the spring.4. The middle diameter of the spring is D: the average diameter of the spring. Their calculation formula is: D= (D2+D1) +2=D1+d=D2-d5, pitch T: except for the support ring, the distance between the two adjacent circles of the spring corresponds to the axial distance on the middle diameter of the spring, and is expressed by t.6, effective circ...

Inspection content and specification for spring parts(part 1)

2018 - 08 - 15

1, Test classificationA) First inspection;B) Quality consistency check.2, A spring group of groupsThe spring shall be inspected according to the batch. Each batch shall consist of the same material specifications, grades, melting furnace numbers and springs made under the same technological conditions.3, First test3.1 The inspection of the production of the spring first piece must be carried out according to the test or inspection items specified in the drawings, and the determination of qualified and unqualified shall be made. 3.2 The first piece of spring must be checked and recorded in...

Analysis of surface defects of carbon steel wire rod

2018 - 08 - 29

In view of the harm caused by the surface defects of high carbon steel wire rods, the surface defects of high carbon steel wire rods were systematically analyzed by means of surface pickling, metallographic analysis and scanning electron microscopy, the types of defects were determined, the causes of defects were analyzed, and the improvement measures were put forward. After the implementation of these measures, the surface defects of high carbon steel wire rods were basically eliminated. Surface quality defects. The conclusions are as follows: 1. The surface defects found in high carbon ...

Spring machine regular maintenance and daily maintenance is very important

2018 - 09 - 12

Spring machine is now in the production of spring necessary equipment, due to the abundant of spring and the increase of precision is also more and more high to the requirement of spring machine, the spring machine maintenance is particularly important at ordinary times, and the main factors affecting the service life of spring machine has two, one is the operator of whether scientific and standardized operation, another is reasonable in daily maintenance.After using the spring machine for a period of time, the efficiency of the machine will be significantly reduced, affecting the efficiency o...

Properties of spring material

2018 - 09 - 22

1) high strength: in order to improve the spring's ability to resist fatigue failure and relaxation, the spring material should have a high yield strength and elastic limit, and in particular, a high ratio of strength to strength.In general, the elastic limit of the material is directly proportional to the yield strength, so the spring design and the manufacturer always want the material to have a high yield strength.The tensile strength and yield strength of the spring material are close, for example, about 90% of the carbon steel wire of cold drawn is about: since the tensile strength is...

Type of paint used on spring surfaces

2018 - 10 - 09

The paint used for the spring coating is usually of the following types:(1) asphalt paint has good water resistance, moisture resistance and corrosion resistance, especially excellent acid resistance and good alkali resistance.But adhesion, mechanical strength, poor decorative performance.(2) phenolic paint can be divided into two types: primer and topcoat. Phenolic primer has strong adhesion, good rust resistance, but poor mechanical strength and gloss.Phenolic coating film is hard, gloss good, but poor weather resistance, easy to yellow.(3) alkyd paint alkyd paint film is tough, with strong ...

The manufacturing process of cold formed spring

2018 - 10 - 19

When the spring is made from materials that do not need to be hardened or tempered after forming, the process is spiral compression spring: rolling, de-stressed annealing, grinding of two ends, (shot blasting), (rectification), (de-stressed annealing), standing or strong pressure treatment, inspection, surface anti-corrosion treatment, packaging.Coil stretching spring: rolling, de-stress annealing, hook making, (cutting the tail), de-stress annealing, standing treatment, inspection, surface anti-corrosion treatment, packaging.Spiral torsion spring: rolling, de-stress annealing, torsion arm mak...

Coil extension, torsion spring manufacturing

2018 - 11 - 02

Cylindrical spiral spring structureThere are three types of cylindrical spiral spring:1. Cylindrical spiral compression spring1) spacing between springsLet the spring's pitch be p;The diameter of the spring wire is d;In the free state, there should be proper spacing between the circles.In order to make the spring still maintain a certain elasticity after compression, it is also necessary to ensure that there is a certain gap of 1 between each circle under the maximum load.The size of lens 1 is generally recommended to be: in addition 1=0.1d or greater than 0.2mm2) dead circleThe two ends o...

We’ll be the exhibitor of Manufacturing world Japan 2018 in Tokyo from June 20-23.

2018 - 04 - 18

To develope the new customer and enhance the exist business relationship, we’ll be exhibiting at the 22th MechaniceComponents&Material Technology Expo(M-Tech) in Tokyo Japan from JUNE 20-23. Your visiting at that timeIs highly welcomed!

Consultation

hotline

86-755-28903525

Room 316,Building 4,Tusincere Science&Technology Park,QingChun Road,LongCheng Street,LongGang District, ShenZhen,China.

The passivation process for springs

日期： 2019-12-30

浏览次数: 188

1、What is Passivation?

As a post-fabrication method, passivation is intended to maximize the natural corrosion resistance of stainless steel. Stainless steel is a steel alloy that contains a minimum of 10.5% chromium content by mass and along with a number of other alloys. When stainless steel is newly formed it needs to be cleaned of lubricants, oils, greases and other substances used in its fabrication. Once the steel has been cleaned it must be passivated. Passivation is a process that treats metal surfaces with an acid solution to make the surface corrosion resistant.

Passive to atmospheric conditions by removing the free iron from the surface that causes corrosion. Once treated with an acid solution, slowly and naturally a passive layer develops on the surface of the steel as the chromium at the surface reacts with oxygen in the air to produce chromium oxide. The molecular layer of chromium oxide provides a barrier to prevent oxygen and moisture from reaching the iron underneath that would otherwise rust if oxygen and moisture contact the iron.

2、The Purpose of Passivated Springs

Because springs are highly susceptible to corrosion they need to be passivated. If springs are not passivated after they are formed, pitting and cavity corrosion of the metal will occur, reducing its strength, thickness, and structural integrity. In addition to environmental conditions, corrosion can occur simply through contact. Without passivation, if oxide deposits from a rusting piece of metal touch non-rusting stainless steel it will spread beyond the point of contact. Corrosion can also happen in any crevice or confined space on a metal’s surface, such as the gaps amongst a nut and a bolt.

3、How Passivated Springs are Treated

Passivated springs are treated through citric acid passivation or nitric acid passivation. Either method treats the metal with an acid solution that acts to remove any free iron from the metal’s surface before that iron can react to water and oxygen in the air, causing rust oxidation.

The use of citric acid passivation or nitric acid passivation of springs depends on its application. Medical grade stainless steel device passivation is an important aspect of taking care of medical parts and components. Today, custom springs for medical devices generally receive citric acid passivation due to its ease of chemical handling, disposal and overall safety for employees involved in the passivation of springs. On the other hand, food-grade stainless steel springs manufactured for use in the food industry typically utilize nitric acid passivation.

In the manufacturing of springs, passivation is a necessary step that is used to resist corrosion and further removal of contaminants from the surface of stainless steel components that have accrued during the manufacturing process.

last：Compression spring,torsion spring,extensNext：Spring Design

Relevant recommendations

Constant Force Spring

2020 . 01 . 13

Constant force spring, or “clock” spring, is a roll of prestressed strip which exerts a nearly constant restraining force to resist uncoiling. The force is constant because the change in the radius of curvature is constant. Such applications as brush springs for motors, counterbalance springs for window sashes and carriage return springs for typewriters. Constant force motor springs are used to drive mechanisms for timers, movie cameras and cable retractors.Constant force spring also known as coil spring helix in a plane of the spring, Spring is the material wound into a plane of the spiral of a spring, the spring is fixed at one end, the other end of the material after acting torque bending torque, bending elastic deformation, so the spring in its own plane to p...

Compression Springs

2020 . 01 . 13

A compression spring is an open-coil helical spring that offers resistance to a compressive force applied axially. They are usually coiled at a constant diameter, though they can be coiled in other needed forms such as conical, concave (barrel), convex (hourglass), or various combinations of these. Compression springs are used to resist force and/or store energy,1、CharacteristicsBy far the most widely used type of spring, compression springs are designed to oppose compression and return to its uncompressed length when the applied force is removed. 2、Service LifeIt should be noted that if critical force-versus-deflection linearity is required, only the center 60-80% of the available deflection range should be employed.Thus, reserve at least the first and last 15-20% of t...

Spring wire materials

2020 . 01 . 06

When choosing the right spring, selecting the best spring wire is a critical before manufacturing. Below are some of the most common spring wire materials and their unique characteristics .Stainless Steel SpringsStainless steel springs have low-stress relaxation and resist corrosion. They have good strength at moderate temperatures and are resistant to heat. Extension springs are most commonly made from stainless steel.Extension springs absorb energy and provide resistance to pulling. As the name suggests, an extension spring stretches as a load is applied to it. Applications for extension springs include carburetors, trampolines and farm machinery.Oil Tempered Spring WireOil tempered wire is cold drawn and heat treated before plating. Ideal as a general purpose spring wire, it is often us...

Compression spring,torsion spring,extension spring,wire forming spring

2020 . 01 . 06

springs are a mechanical part that use elasticity to work. Generally made of spring steel. It is widely used in machines and instruments to control the movement of machine parts, mitigate impact or vibration, store and store energy, measure force, etc.The spring is just an accumulator, it has the function of storing energy, but can not release the energy slowly, to achieve the release of this function should rely on the 'spring + large transmission ratio mechanism' to achieve, common in the mechanical table.The spring is widely used in the mechanical and electronic industry. The spring can produce a large elastic deformation under load and convert mechanical work or kinetic energy into deformation energy. After unloading, the spring's deformation disappears and returns to its o...