HOT INFORMATION / More
1
2018 - 04 - 18
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 need...
2
2018 - 07 - 31
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...
3
2018 - 08 - 13
With the development of spring application technology, more requirements for spring materials are put forward. The main reason is to improve the fatigue life and anti relaxation performance under high stress; secondly, according to different uses, it is required for corrosion resistance, non magnetic, electrical conductivity, wear resistance, heat resistance and so on. In addition to the development of new varieties, the spring materials have achieved beneficial results in the aspects of strict control of chemical composition, reducing non-metallic inclusions, improving the surface quality and...
4
2018 - 08 - 25
Wire forming spring is a mechanical part that uses elasticity to work. It is usually made of spring steel. It is used to control the movement of machine parts, to mitigate impact or vibration, to store energy and to measure the magnitude of force. It is widely used in machines and instruments.The spring is just an accumulator. It has the function of storing energy, but it can not release the energy slowly. To realize the function of releasing slowly, it should be realized by "Spring + large transmission ratio mechanism", which is common in the mechanical meter.Spring is a kind of ela...
5
2018 - 09 - 10
Spring grinding is easy to produce cracks at the end of the tightness, and directly affect the verticality of the spring, load and free length size, so the general grinding process of spring should be carried out after stress relief tempering. Eliminate the residual stress of steel wire cold drawing to prevent the generation of end gap cracks.The main factors that affect the quality of springs in grinding are as follows:(1) The grinding wheel should be selected reasonably; (2) the control of the bevel angle of the end ring; (3) a certain number of special measuring tools should be equipped to ...
6
2018 - 09 - 20
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...
7
2018 - 09 - 30
Washing method according to the surface state:General notice when washing, please pay attention not to scratch the surface to avoid the use of bleaching ingredients and abrasive solution, steel wire ball (brush roller ball), grinding tools, etc. In order to remove the washing liquid, wash the surface with clean water at the end of washing.Surface condition and washing methodDirt and scale removal - wash with soap, mild detergent or warm water.Label and film -- scrubbing with warm water and weak detergent;Binder ingredients - use alcohol or organic solutions;Contamination of fats, oils, lubrica...
8
2018 - 10 - 17
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 ...
9
2018 - 10 - 29
The torsion spring is divided into single torsion spring and double torsion spring. The spring is usually inserted into the pin or shaft. When external force is applied, a torsion force is generated according to the shaft center of the spring to make the spring coiled tightly or loose.Double - twist spring is divided into external double - twist and internal double - torque spring.The loops are either closely encircled or separately encircled to allow for a load of torque (at right angles to the spring axis).The end of the spring can be wound into a hook or straight twist arm.The following is ...
NEW INFORMATION / More
1
2018 - 04 - 18
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 need...
2
2018 - 08 - 08
The spring is often subjected to variable load or impact load. In order to ensure that the spring can work permanently and reliably, the material must have high elastic limit and fatigue limit. At the same time, it should have enough toughness and plasticity and good heat treatment.Spring materials and properties can be consulted in relevant manuals, specifications and standards (GB/T129.6-92, GB4357-89). The common spring steel is mainly:1: carbon spring steelThis kind of spring (such as 65, 70 steel, etc.) has the advantages of cheap price, convenient source of raw materials, low elastic lim...
3
2018 - 08 - 20
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...
4
2018 - 09 - 05
1, matching springs and springs based on automobiles, motorcycles, diesel engines and gasoline engines. This type of spring has valve spring, suspension spring, damping spring and clutch spring, etc., with a large amount, which accounts for about 50% of the spring production. At the same time, the technical level is also high, it can be said that the technical level of these springs is representative, they are mainly to the high fatigue life and high anti relaxation direction, thus reducing the quality. 2. Large springs and plate springs, which mainly include railway rolling stock, heavy ...
5
2018 - 09 - 18
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...
6
2018 - 09 - 28
The diameter of wire wound by automatic spring machine is 0.2-3mm, and the adjustment process is as follows:1. Calibrate the feeding roller and winch to fit the diameter of steel wire and install the pitch wedge and cutting knife.2. Insert the steel wire into the spring machine and press the pressure plate and feeding roller.3. Adjust the distance of winding xiao zi, control the diameter of spring, and adjust the pitch wedge and xiao zi Angle to control the spring pitch and parallel head.4. Install an appropriate cutter, adjust the feeding CAM according to the spring expansion length, cut off ...
7
2018 - 10 - 15
(1) deformation heat treatment -- the combination of deformation reinforcement and heat treatment enhancement to further improve the strength and toughness of steel.Heat treatment of deformation has high, medium and low temperature.The high temperature deformation heat treatment is to produce the deformation immediately after the austenitic state at a stable distance, or can be combined with forging or hot rolling, that is, quenching immediately after hot forming.The deformation heat treatment has been applied to automobile plate spring production.(60 si2mn)(2) isothermal quenching of spring -...
8
2018 - 10 - 25
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...
9
2019 - 12 - 16
Helical springsMaterials necessary for every aspect of daily life.  Helical spring is a spring that is subjected to torsional deformation, and its working part is also tightly wound into a helical shape. Its characteristic line is linear, can make compression spring, stretch spring and torsion spring. When the load is large and the radial size is limited, two compression springs with different diameters can be used together to become a combination spring. The total winding number n1 is the sum of the effective winding number n and the supporting winding number n2. Volute coil helical...
CONTACT US / More
hotline
86-755-28903525
Room 316,Building 4,Tusincere Science&Technology Park,QingChun Road,LongCheng Street,LongGang District, ShenZhen,China.

Hardness testing method for tempering heat treatment

日期: 2018-09-17
浏览次数: 60
Daisy

Hard inspection method for chemical heat treatment and surface quenching and tempering

Surface heat treatment is divided into two categories, one is chemical heat treatment and the other is surface quenching and tempering heat treatment. The hardness test method is as follows:

1. Chemical heat treatment

Chemical heat treatment is to make the workpiece surface infiltrate one or several chemical elements of the atom, thereby changing the workpiece surface chemical composition, organization and performance.After quenching and tempering, the surface of the workpiece has high hardness, wear resistance and contact fatigue strength, and the core of the workpiece has high toughness.

The main technical parameters of chemical heat treatment workpiece are the depth of hardened layer and surface hardness.The depth of the hardened layer is still determined by a vickers hardness tester.Detect the distance from the surface of the workpiece to the point where the hardness is reduced to 50HRC.This is the effective depth of hardening chemical heat treatment of workpiece surface hardness testing and surface heat treatment quenching hardness testing, can use vickers hardness tester, surface rockwell hardness tester or rockwell hardness tester to test, only the thickness of nitriding thick thin, generally not more than 0.7 mm, is no longer using rockwell hardness tester.

2. Surface quenching and tempering heat treatment

Surface quenching and tempering heat treatment is usually performed by induction heating or flame heating.The main technical parameters are surface hardness, local hardness and effective depth of hardened layer.The hardness test can be done by vickers hardness tester, or by rockwell hardness tester or surface rockwell hardness tester.The selection of test force (scale) is related to effective hardening depth and workpiece surface hardness.There are three types of durometer involved here.

The vickers hardness tester is an important means to test the surface hardness of the heat-treated workpiece. It can choose the test force of 0.5 ~ 100kg to test the surface hardening layer of the workpiece thin to 0.05mm thick. It has the highest accuracy and can distinguish the slight difference of the surface hardness of the heat-treated workpiece.In addition, the effective depth of the hardening layer is also detected by the vickers hardness tester, so it is necessary to have a vickers hardness tester for the units that conduct surface heat treatment or use a large number of surface heat treatment workpieces.

The surface rockwell hardness tester is also very suitable for testing the hardness of surface hardened workpiece.Various surface hardened workpieces whose effective hardening depth exceeds 0.1mm can be tested.Although the precision of the surface rockwell hardness tester is not as high as that of the vickers hardness tester, it has been able to meet the requirements as a means of quality management and qualified inspection in the heat treatment plant.In addition, it is easy to operate, easy to use, low price, rapid measurement and direct reading of hardness values. By using the surface rockwell hardness tester, it can be used to quickly and nondestructive testing of the surface heat treatment workpieces.This is of great significance to metal processing and machinery manufacturing plants.

When the surface heat treatment hardening layer is thicker, the rockwell hardness tester can also be used.HRA scale can be used when the thickness of heat treatment hardening layer is between 0.4 and 0.8mm, and HRC scale can be used when the thickness of hardening layer is over 0.8mm.

The three hardness values of vickers, rockwell and surface rockwell can be easily converted into standard, drawing or required by the user.Corresponding conversion tables are given in ISO, ASTM and GB/T.These three conversion tables can be found in the technical data column of shenyang tianxing website.

3. Local heat treatment

For parts with high local hardness requirements, local quenching heat treatment can be carried out by induction heating, etc. Such parts usually need to indicate the location of local quenching heat treatment and local hardness value on the drawing.The hardness test of the part should be carried out in the designated area.The hardness tester can use the rockwell hardness tester to test the HRC hardness value. For example, the surface rockwell hardness tester can be used to test the HRN hardness value if the hardening layer of heat treatment is shallow.

Hardness testing method for tempering heat treatment

Relevant recommendations
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...
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...
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...
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...
Related products / Products
  • 发布时间: 2018 - 04 - 08
    Precision Torsion Spring:Description: wire diameter ranged from Φ0.10-Φ14mm, minimum spring convolution: 3•Various materials: music wire,galvanised wire, carbon wire,stainless steel wire, copper, beryllium copper wire, and more•Various torsion arms•Single torsion, double torsion and multi-torsion•Torsion in different direction•Applications: all kinds of cars, machines, electronic products,electric appliance, cameras, stationery, computers, power switches,miniature switches, architecture, commodity and home appliance, A/Vequipment, hardware and plastic molds, sports equipment and gifts
  • 发布时间: 2018 - 04 - 08
    拉伸弹簧
    Precision Extension spring:Description: wire diameter ranged from Φ0.08-Φ14mm, minimum spring convolution: 2.7, hook style can be customized per customer’s requirement•Spring loops and hooks vary in different shapes•Changeable diameter•Advanced manufacturing and testing equipment•Made of standard material•Applications: furniture, electronic products, electric appliance, architecture, commodity and home appliance, sports equipment and gifts
  • 发布时间: 2018 - 04 - 08
    异形弹簧
    Auto wire forming Spring:Description: CNC forming, maximum feeding error:0.05mm,wire diameter ranged from 0.08-14mmAUTO Wire Formings and Clasps, Round, Flat and Square Wire Types are Available•Produced by specific clasp formers•Round wire, flat wire and square wire•Advanced manufacturing and testing equipment•Exported directly•Standard material•Responsive service•Applications: all kinds of cars, machines, electronic products,electric appliance, cameras, stationery, computers, power switches,miniature switches, architecture, commodity and home appliance, A/Vequipment, hardware and plastic moul...
  • 发布时间: 2018 - 04 - 08
    CD盖弹簧、电器按钮弹簧、剃须刀弹簧等…
    For household applicancedDescription: wire diameter ranged from Φ0.10-Φ14mm, minimum spring convolution: 3Various materials: music wire,galvanised wire, carbon wire,stainless steel wire, copper, beryllium copper wire, and moreVarious torsion armsSingle torsion, double torsion and multi-torsionTorsion in different directionApplications: all kinds of cars, machines, electronic products,electric appliance, cameras, stationery, computers, power switches,miniature switches, architecture, commodity and home appliance, A/Vequipment, hardware and plastic molds, sports equipment and gifts
  • 发布时间: 2018 - 04 - 20
    Bttery shell stamping parts
Copyright ©2018 AFR PRECISION TECHNOLOGY CO,LTD
Xiniuyun Providing enterprise cloud services
在线聊天
live chat
-->
客户服务
live chat