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HOT INFORMATION / More

2018 - 04 - 18

We do cherish the time together with all of our esteemed customers. The picture shows the progressive hour withOne of our French customer who focus on the water purification system industry.

Inspection content and specification for spring parts(part 2)

2018 - 07 - 28

Detection of geometric size of 6.1 compression springs6.1.1 spring material diameter detection: check the spring material diameter generally with vernier caliper or micrometer. In particular, attention should be paid to the inspection of springs with small winding wires and annealed alloy wires wrapped by automatic spring coiling machines.6.1.2 spring free height or free length detection: the spring is generally placed in horizontal position measurement. It is allowed to be placed in erect position only when the self weight has no obvious effect on the height or length of the spring when it is...

A brief history of the development of Hooke's law

2018 - 08 - 09

At first, during the experiment, Hooke found that the weight added to the spring was proportional to the elongation of the spring, and he tested his conjectures by many experiments. In 1678, Hooke wrote a spring paper, which introduced the results of experiments on elastic objects, laying the foundation for the development of material mechanics and elastic mechanics.Spring dynamometerIn the early nineteenth Century, under the premise of a lot of experimental work in the former, British scientist Thomas Yang summed up the research results of Hooke and others, pointing out that if the elongation...

Types of Springs and their Applications

2018 - 08 - 21

Springs are ubiquitous in all kinds of machines—from consumer products to heavy industrial equipment, take apart anything that involves a mechanism, and chances are, you’ll find a spring inside. Springs are storage devices for mechanical energy—think of them as analogous to batteries! The earliest spring-driven clocks appeared in the 1400s. Fast-forward some 600 years, you still have to charge the Apple Watch everyday, and it’s not nearly as fast as winding a clock…but I digress.My personal fascination with springs began with Slinkies and wind-up toys, and countless mechanical pencils were sac...

Production of spring

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...

Penetration testing of springs

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...

Development of special spring and material requirements

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...

Surface treatment of stainless steel spring

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 ...

Metal spring plays an important role in safety valve

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...

NEW INFORMATION / More

Pregressive hour

2018 - 04 - 18

We do cherish the time together with all of our esteemed customers. The picture shows the progressive hour withOne of our French customer who focus on the water purification system industry.

The effect of the production process of the spring factory on the product

2018 - 08 - 03

Spring is no stranger to everyone. This element is seen everywhere in life. It is also one of the important parts of many industrial machinery equipment. There are many kinds, with different forms, specifications and sizes, and are widely used in the field. Now the spring plant is basically able to produce a variety of different springs. This component is made with special steel. The structure is relatively simple, but it is also required for the production process, so the manufacturer's production equipment and technology will affect the finished product.So if you need to choose a better ...

Inspection content and specification for spring parts(part 4)

2018 - 08 - 16

7. Detection of the characteristics of cylindrical helical spring7.1 detection of the characteristics of tension and compression springsThe characteristics of the characteristic tensile and compression springs of the 7.1.1 spring should be in accordance with the characteristics of the spring. Under the load of the specified height (or length), the deformation of the spring should be between the 20%~80% of the deformation amount under the test load, and when the I class precision is required, the deformation of the spring should be above 4mm at the specified height load. It should be between 30...

Causes and preventive measures of quenching cracks

2018 - 08 - 31

1. Shape effect is mainly caused by design factors, such as small fillet R, inappropriate location of acupoints, poor cross-sectional transition. 2. Overheating (overheating) is mainly caused by improper temperature control or running temperature, excessive process setting temperature, uneven furnace temperature and other factors. Preventive measures include overhaul, calibration of temperature control system, correction of process temperature, the addition of pad iron between the workpiece and furnace floor, etc.3. Decarbonization is mainly caused by overheating (or overburning), unprote...

Method for improving heat treatment performance

2018 - 09 - 14

Manufacturers of heat treatment furnaces are adopting new features designed to improve the overall temperature distribution of their equipment: with improved ambient flow patterns, carefully designed energy and dynamic densities have brought very useful working capabilities.Process consistency is a major issue for aerospace (typically, Nadcap and AMS2750 U.S. army standards) and automotive (TS16949 test equipment) customers, and compatibility with more acceptable standards is building confidence between heat treatment equipment manufacturers and customers.This is especially true when the heat ...

Working characteristics of pressure spring

2018 - 09 - 26

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 ...

Method for improving heat treatment performance

2018 - 10 - 11

Penetration testing of springs

2018 - 10 - 22

Application of valve spring

2018 - 11 - 03

Internal combustion engine valve spring, low, medium and high stress valve spring, safety valve spring, pressure reducing valve, electric regulating valve, pneumatic regulating valve, self-support regulating valve, hydraulic control valve, steam trap, gate valve, as per valve, butterfly valve, ball valve, check valve, special valve, hydraulic valve, electromagnetic valve, etc.Relief valve: spring safety valve by using the spring force, spring loaded relief valve is closed and not closed in two kinds of structure, general inflammable, explosive or toxic medium should choose enclosed, steam or i...

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Introduction of heat treatment process -- surface quenching

日期： 2018-09-13

浏览次数: 76

Daisy

The surface of steel is hardened

In some parts, the surface layer of the workpiece bears higher stress than the core under the action of alternating loads such as torsion and bending and impact loads.In the case of friction, the surface layer is also constantly worn. Therefore, high strength, high hardness, high wear resistance and high fatigue limit are put forward for some surface layer of parts. Only surface strengthening can meet the above requirements.Because surface quenching has the advantages of small deformation and high productivity, it is widely used in production.

According to different heating methods, surface quenching mainly includes induction heating, flame heating and electric contact heating.

Quench by induction heating

Induction heating is to use electromagnetic induction to produce eddy current in the workpiece and heat the workpiece.The ratio of induction heating surface quenching to ordinary quenching has the following advantages:

1. The heat source is on the surface of the workpiece, with fast heating speed and high thermal efficiency

2. The workpiece is less deformed due to non-integral heating

3. The heating time of workpiece is short, and the surface oxidation decarburization amount is small

4. High surface hardness, small gap sensitivity, impact toughness, fatigue strength and wear resistance of the workpiece are greatly improved.It is helpful to realize the potential of materials, save material consumption and improve the service life of parts

5. Compact equipment, easy to use and good working conditions

6. Facilitate mechanization and automation

7. It can be used not only in surface quenching but also in penetration heating and chemical heat treatment.

The basic principle of induction heating

The workpiece is placed in the sensor. When the alternating current passes through the sensor, an alternating magnetic field is generated around the sensor at the same frequency as the current. The induced electromotive force is correspondingly generated in the workpiece.Under the action of the resistance of the workpiece, electric energy is converted into thermal energy to make the workpiece surface temperature reach the quenching heating temperature, which can realize the surface quenching.

Properties of induction surface after quenching

1. Surface hardness: the workpiece hardened by high and medium frequency induction heating is usually 2 ~ 3 units (HRC) higher than ordinary quenching.

2. Wear resistance: the workpiece after high frequency quenching has higher wear resistance than ordinary quenching.This is mainly due to the martensite grain size of the hardened layer, high carbon dispersion, high hardness and high compressive stress on the surface.

3. Fatigue strength: high, medium frequency surface quenching increases the fatigue strength greatly, and the notch sensitivity decreases.For workpieces of the same material, the depth of hardening layer is within a certain range, and the fatigue strength increases with the increase of hardening layer depth. However, when the depth of hardening layer is too deep, the surface layer is compressive stress, so the increasing fatigue strength of hardening layer depth decreases instead, and the brittleness of workpiece increases.Generally, the depth of hardened layer is (10 ~ 20) % D.More appropriate, where D.Is the effective diameter of the workpiece.

Introduction of heat treatment process -- surface quenching

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