Cutting the real causes of residual stress and stress type (B)

Cutting the real causes of residual stress and stress type (B)

Machining residual stress generated in the metal surface by three main reasons: cold plastic deformation, thermal deformation, the local microstructure changes. Here’s a closer look at the substance of these three reasons and what the type of stress, and overall performance have any impact on the workpiece.

Cold plastic deformation caused by residual stress in the cutting process, the machined surface by the blunt part of the cutting edge and flank compression and friction, resulting in plastic deformation. As the plastic deformation produced only in the surface layer, the surface layer of metal specific volume increases, volume expansion, but connected to it by the inner layer of metal to contain, so the metal surface residual compressive stress in the layer of residual tensile stress.

Plastic deformation caused by thermal residual stress in machining, the cutting area will be a lot of cutting heat generation, the surface temperature is often high, then the metal substrate temperature is lower. Therefore, the surface stress generated hot. After the cutting process, the surface temperature and the substrate temperature down to the same, because the surface has produced thermoplastic deformation, the matrix shrinkage is subject to the constraints arising from the residual tensile stress in the residual compressive stress layer. Grinding the higher the temperature the greater the thermoplastic deformation, the greater the residual tensile stress, and sometimes even cracks.

Changes in microstructure caused by the residual stress of cutting the metal surface layer temperature will change in the microstructure. Different microstructure have different densities. Surface layer of metal microstructure changes in the volume change, will be subject to the limitations of metal matrix residual stress. When the surface layer of the metal volume expansion, the metal surface residual compressive stress in the metal layer residual tensile stress; smaller in size when the surface layer of metal, the metal surface residual tensile stress, resulting in residual compressive stress layer of metal.

Grinding hardened steel, if the surface layer have tempered their microstructure into martensite sorbite by the trust’s or body surface metal density increases smaller in size. Surface layer will have a residual tensile stress in the layer will have a residual compressive stress. When the surface layer of residual compressive stress exists, can delay fatigue cracks, expand and improve the fatigue strength of the workpiece; when the surface layer of the existence of residual tensile stress, the workpiece surface is prone to cracks and reduce fatigue. So try to avoid tensile stress in the process of production, and to try to change the methods and processes to be stress. The next section will briefly explain Haoke metal surface processing technology pre-good in the application of compressive stress.

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Residual stress in the production of metal cutting and Analysis

Residual stress in the production of metal cutting and Analysis

American Association for the Study of metal cutting in 1964 by M. Filed and J. Kahles first two experts in the industry made ​​in metal cutting “surface integrity” concept, which refers to the control of the processing methods due to the impact of lead to the finished surface of the state or performance without any damage, or even enhance the results. It is from the processing state of the metal surface geometry and surface texture materials, disturbed areas of physics, chemistry, mechanical properties of two ways to evaluate and control the surface quality.

Processing of the metal surface residual stress of size, orientation and distribution of surface integrity is an important indicator of assessment, in addition, the integrity of the surface morphology evaluation as well (including surface roughness, surface waviness and texture ), surface defects (including macro-cracks, scars, corrosion), microstructure (including micro-cracks, grain size, intergranular corrosion) and other engineering properties of the surface. Here, I briefly touch on the surface of metal cutting and types of residual stress generated.
Machining process is a complex process, affected by many factors (see below for milling, for example) the resulting complex stress, resulting in the quality of the workpiece can not be guaranteed, and even distortion.

Machining the workpiece surface layer of tissue changes in the surface and the substrate material and the junction will have a balance between the elastic stress, the stress that is, the surface layer of residual stress. It produces three main reasons:
◇ cold plastic deformation
◇ hot plastic deformation
◇ local microstructure changes

After cutting the actual surface layer of residual stress is the combined result of three reasons. Cold plastic deformation dominates, the surface layer will have a residual compressive stress; when the thermoplastic deformation dominates, the surface layer will have a residual tensile stress. In the next section will detail the substance of these three causes residual stresses and their respective types.

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The advantage of welding stress relieving equipment

The advantage of welding stress relieving equipment

I. Haoke residual stress relief is the most complete elimination of residual stress and stress produce the ideal way of limitation, other limitation methods to eliminate the residual stress as follows:

1 30 ~ 60% of the VSR

(2) thermally aged 35 to 80%

3 Haoke time 80 ~ 100%)

Two. Haoke welding residual stress stress relief of welded structure for the elimination of residual stress, fatigue strength of welded joints can be increased by 50% -120%, and 5-100 times to extend the fatigue life of metal resistance in corrosive environments corrosion increased by about 400%. Can completely replace the aging heat treatment and other methods of VSR, process simple, stable and reliable, and simply want to deal with where the process is where can at any time, any process on, so you arbitrary, handy.

Three. Haoke eliminate residual stress from the workpiece material, shape, structure, plate thickness, weight, site of the restrictions, especially in the field, the welding process and welding repair welding for the elimination of stress is more flexible and convenient.

Four. Haoke eliminate stress treatment can also improve the fatigue properties of weld impact of several factors, such as:

1 residual stress

(2) micro-cracks and defects

3 weld toe geometry

4 surface hardening,

Which is to improve weld fatigue performance of the most effective way to have a multiplier effect.

V. Hawk can eliminate stress welding equipment in the elimination of seam weld toe stress concentration area, is the most convenient, most effective, and its far more than in the weld toe remelting arc welding (TIG) or grinding of method.

Six. Haoke residual stress relief equipment for the elimination of local residual stress, heat and vibration completely replace aging and other aging methods, and the process simple, stable and reliable, suitable for large-scale structure of the weld site, low at high weld, the weld repair weld stress relief treatment.

Seven Energy saving, security, pollution, the construction site is more flexible and convenient to use.

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Principle and Application of VSR

VSR process development
Method using a vibrating metal components to eliminate the residual stress techniques, in 1900 obtained a patent in the United States. However, long-time use of heat, coupled with the vibration to eliminate stress at the time the mechanism is not very clear, and high-speed motor has not yet caused the heavy equipment, adjust the inconvenience, so the technology has not been developed and applied.
Until the 1960s the energy crisis, the United States, Britain, Japan, Germany and other countries only began to study the mechanism and application of VSR process. Since the 1970s, especially to the emergence of adjustable speed motor, vibration to eliminate stress to promote the device (VSR system) development: in 1973 the British made portable VSR system that VCM80, Martin Engineering Company and later the United States has developed a more advanced equipment LT-100R-based VSR system. France and Soviet Union were also produced PSV-and NB-based VSR system. The excitation of these more advanced devices, vibration to eliminate stress to promote the development and application of technology.
According to statistics, currently the world’s VSR system is being used about one million units. U.S. VSR process using more than 700 companies, the Soviet Union and Eastern European countries are also widely used, have achieved significant economic benefits. Many countries have set the VSR must be used for some mechanical components of the standard process. Almost no company in the UK do not use the technology.
VSR equipment applications
Vibration treatment abroad relatively wide range of applications, the component types to be handled more. For example:
1. British company producing large precision machine tools, the column bed with required accuracy 0.01mm/2m. Thermal aging in the past to maintain its accuracy is poor, then switch to VSR, to meet the accuracy requirements, so now has the product VSR as the standard process.
2. UK production of aluminum alloy casting precision pump, the size of 275 × 300 × 150mm, but also with the VSR to ensure its accuracy.
3. U.S. PX engineering company, with the VSR to eliminate 8 tons of welded structure gears of internal stress, to reduce weld cracking.
4. U.S. Pont Land electronics specialist with the technology for 4 tons of forging blank. The company provides treatment forging three times the vibration:
(1) blank (2) after roughing (3) after finishing. Three treatment after forging to ensure stability.
5. Washington, United States Steel Corporation, the company produced 47 tons of heavy shears seat vibration treatment. Shears seat is 152mm to 203mm thick steel plate welded into, ribs 38mm to 76mm thick so large and heavy components only 40 minutes of vibration treatment on the past instead of the thermal aging.
6. Northwest Industries of America 2800 tons of heavy marine tower and 1280 tons of heavy drilling platform also used over vibration aging treatment.
7. British land use VSR wellhead platform, wellhead platform is 200mm diameter steel pipe welded into 6m × 6m × 2m tube frame.
8. British jet engine flame tube lining, due to the occurrence of post-weld heat expansion cracks, scrap rate of 30% or more, then the use of VSR process, scrap rate is almost zero.
9. UK production of all special machine bed is replaced with the VSR heat aging. More than 30 dozen Forging Machine Tool Plant and Equipment Factory is the VSR as a standard production process.
United States, Britain and other countries also in other industrial sectors using VSR Dali, such as Paper Machinery Factory, ships bearing plants, laser welding machine factory, gearbox factory, textile machinery, steel rolling plant, Printing Machinery, pump factory , oil equipment factory, power plant, boiler plant and so the application of VSR to eliminate the stress components.
Since 1975, the technology in China has been rapid development and promotion of the machine castings made great breakthrough.
Over the years, on the VSR fatigue life of welded components is the impact of domestic and foreign experts of great interest and debate focused. Some of our units to do a lot of research, concluded that the VSR on the mechanical properties of metallic materials have a greater impact, reasonable VSR process can improve the fatigue life of welded components. These conclusions for the VSR in the application of welded components on a theoretical foundation.
VSR process in the country by twenty years of research and application, many companies have some important basic component in the application of the VSR technology.
1. Harbin Electrical Machinery Plant manufacturing power plant equipment in a large generator base, cover, ring, turbine guide vanes.
2. China’s first manufacturing plant of heavy machine rolling devices welded structure, large-scale forging axis.
3. Dalian Machine Tool Factory production of combination welding machine bed casting parts and CD6140 lathe bed.
4. Ministry of Railways, Dalian Locomotive Works produced by Dongfeng 4D diesel locomotive bogie welding components, with the VSR improve fatigue life and the second after the engine body vibration rough time, to prevent the body in the use of fatigue cracks.
5. Anshan Iron and Steel Company in blast transformation, some of the aging process can not be a large metal structure, such as the furnace shell, care circles, arches, ladle turret and so on.
6. Major projects in the aerospace field in the welding of large metal structure with a vibration to eliminate stress.
7. Dalian Engineering Technology Co., Ltd. products VSR single crystal furnace shell, stainless steel door by welding manufacturing, not heat aging, the use of VSR, which prevents deformation, but also improves the corrosion resistance.
8 letter of Technology, Dalian Co., Ltd. to help the Tang Beijing Shougang Iron and Steel Company a 5500 m3 blast furnace stove dome shell section and the vibration of high-temperature aging treatment to improve the blast furnace life.

Electrical Technology Co., Ltd. Shandong Huayun Founded in 1993, is a sophisticated science and technology with international standards joint-stock company. Headquartered in national Hi-tech Development Zone – University of Science and Technology Park of Jinan High-tech Zone – the Wu (China – Ukraine) high-tech Cooperation Park, specializes in precision machining Haoke and residual stress field of technology research, product transformation and production promotion, to provide users with a revolutionary Haoke metal surface processing technology and the complete elimination of residual stress measurement and packaged solutions. Products include vibration aging equipment, Hawk can eliminate stress welding equipment, residual stress measurement equipment, Haoke metal surface processing equipment, cutting fluids, anti-rust oil and cleaning agents, has become the world’s longest line of the residual stress field manufacturer of professional studies. The Hawk can be the introduction of metal surface processing technology to make the surface of metal parts in China to improve the three processing levels, even in the general machine parts can also reach the surface of the mirror effect.

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Hawking technology of eliminating welding stress


Promote the use of high-power impact tool Haoke (twenty thousand times per second the frequency) the impact of the metal surface, due to the high-frequency Haoke, efficient and focused under the great energy, making the metal objects have a greater surface of the plastic compression deformation; Haoke shock while changing the original stress field, resulting in compressive stress a certain value (currently, Hawk can eliminate stress welding equipment is the most complete elimination of residual stress, and produce); and to be able to strengthen the impact site. This is a stress relieving equipment, welding Haoke basic principles.
Hawk can eliminate stress welding equipment to improve fatigue properties of welded joints
Metal structure in the welding, the welding method commonly used by melting, the metal filling process, more than to stay high in the joints, pits, and a variety of weld undercut defects, causing serious stress concentration; also have some welding residual stress. In most cases, the residual tensile stress on the fatigue strength of welded structures is detrimental. Meanwhile, a large number of studies have shown that, in the weld toe area of ​​about 0.5mm from the surface of the slag at the general there, micro-cracks and other defects, the defects than the sharp, the equivalent of early fatigue crack initiation. In the stress concentration, weld toe defects and welding slag under the effect of residual tensile stress, the fatigue strength of welded joints and the fatigue life is severely reduced.
Hawk can eliminate stress welding equipment, welding joints increase fatigue strength and fatigue life
Haoke after welding tool to promote the impact of twenty thousand times per second the frequency along the direction of the impact of the weld seam weld toe area, making it a greater compression plastic deformation, so that the weld toe geometry produces smooth transition, thus greatly reducing the weld toe residual high, undercut pits and caused stress concentration; eliminates small weld toe cracks and slag surface defects, suppression of early initiation of crack; adjust the welding residual stress field, to eliminate the welding tensile stress in the vicinity of the weld toe and a certain number of residual compressive stress; while the weld toe area of ​​the material to be strengthened. So Haoke eliminate stress treatment can also improve the fatigue properties of weld affected several factors, such as: micro-cracks and slag defects, surface hardening, weld toe geometry, the residual should be so. Therefore, the Hawk can eliminate stress welding equipment can greatly improve the fatigue strength of welded joints and fatigue life!

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Principle and Application of VSR

VSR process development
Method using a vibrating metal components to eliminate the residual stress techniques, in 1900 obtained a patent in the United States. However, long-time use of heat, coupled with the vibration to eliminate stress at the time the mechanism is not very clear, and high-speed motor has not yet caused the heavy equipment, adjust the inconvenience, so the technology has not been developed and applied.
Until the 1960s the energy crisis, the United States, Britain, Japan, Germany and other countries only began to study the mechanism and application of VSR process. Since the 1970s, especially to the emergence of adjustable speed motor, vibration to eliminate stress to promote the device (VSR system) development: in 1973 the British made portable VSR system that VCM80, Martin Engineering Company and later the United States has developed a more advanced equipment LT-100R-based VSR system. France and the Soviet Union were also produced PSV-and NB-based VSR system. The excitation of these more advanced devices, vibration to eliminate stress to promote the development and application of technology.
According to statistics, currently the world’s VSR system is being used about one million units. U.S. VSR process using more than 700 companies, the Soviet Union and Eastern European countries are also widely used, have achieved significant economic benefits. Many countries have set the VSR must be used for some mechanical components of the standard process. Almost no company in the UK do not use the technology.
VSR equipment applications
Vibration treatment abroad relatively wide range of applications, the component types to be handled more. For example:
1. British company producing large precision machine tools, the column bed with required accuracy 0.01mm/2m. Thermal aging in the past to maintain its accuracy is poor, then use VSR to meet the accuracy requirements, so now has the product VSR as the standard process.
2. UK production of aluminum alloy casting precision pump, the size of 275 × 300 × 150mm, but also with the VSR to ensure its accuracy.
3. U.S. PX engineering company, with the VSR to eliminate 8 tons of welded structure gears of internal stress, to reduce weld cracking.
4. U.S. Pont Land electronics specialist with the technology for 4 tons of forging blank. The company provides treatment forging three times the vibration:
(1) blank (2) after roughing (3) after finishing. Three treatment after forging to ensure stability.
5. Washington, United States Steel Corporation, the company produced 47 tons of heavy shears seat vibration treatment. Shears seat is 152mm to 203mm thick steel plate welded into, ribs 38mm to 76mm thick so large and heavy components only 40 minutes of vibration treatment on the past instead of the thermal aging.
6. Northwest Industries of America 2800 tons of heavy marine tower and 1280 tons of heavy drilling platform also used over vibration aging treatment.
7. British land use VSR wellhead platform, wellhead platform is 200mm diameter steel pipe welded into 6m × 6m × 2m tube frame.
8. British jet engine flame tube lining, due to the occurrence of post-weld heat expansion cracks, scrap rate of 30% or more, then the use of VSR process, scrap rate is almost zero.
9. UK production of all special machine bed is replaced with the VSR heat aging. More than 30 dozen Forging Machine Tool Plant and Equipment Factory is the VSR as a standard production process.
United States, Britain and other countries also in other industrial sectors using VSR Dali, such as Paper Machinery Factory, ships bearing plants, laser welding machine factory, gearbox factory, textile machinery, steel rolling plant, Printing Machinery, pump factory , oil equipment factory, power plant, boiler plant and so the application of VSR to eliminate the stress components.
Since 1975, the technology in China has been rapid development and promotion of the machine castings made great breakthrough.
Over the years, on the VSR fatigue life of welded components is the impact of domestic and foreign experts of great interest and debate focused. Some of our units to do a lot of research, concluded that the VSR on the mechanical properties of metallic materials have a greater impact, reasonable VSR process can improve the fatigue life of welded components. These conclusions for the VSR in the application of welded components on a theoretical foundation.
VSR process in the country after twenty years of research and application, many companies are based in some important parts of the application of the VSR technology.
1. Harbin Electrical Machinery Plant manufacturing power plant equipment in a large generator base, cover, ring, turbine guide vanes.
2. China’s first manufacturing plant of heavy machine rolling devices welded structure, large-scale forging axis.
3. Dalian Machine Tool Factory production of combination welding machine bed casting parts and CD6140 lathe bed.
4. Ministry of Railways, Dalian Locomotive Works produced by Dongfeng 4D diesel locomotive bogie welding components, with the VSR improve fatigue life and the second after the engine body vibration rough time, to prevent the body in the use of fatigue cracks.
5. Anshan Iron and Steel Company in blast transformation, some of the aging process can not be a large metal structure, such as the furnace shell, care circles, arches, ladle turret and so on.
6. Major projects in the aerospace field in the welding of large metal structure with a vibration to eliminate stress.
7. Dalian Engineering Technology Co., Ltd. products VSR single crystal furnace shell, stainless steel door by welding manufacturing, not heat aging, the use of VSR, which prevents deformation, but also improves the corrosion resistance.
8 letter of Technology, Dalian Co., Ltd. to help the Tang Beijing Shougang Iron and Steel Company a 5500 m3 blast furnace stove dome shell section and the vibration of high-temperature aging treatment to improve the blast furnace life.

Electrical Technology Co., Ltd. Shandong Huayun Founded in 1993, is a sophisticated science and technology with international standards joint-stock company. Headquartered in national Hi-tech Development Zone – University of Science and Technology Park of Jinan High-tech Zone – the Wu (China – Ukraine) high-tech Cooperation Park, specializes in precision machining Haoke and residual stress field of technology research, product transformation and production promotion, to provide users with a revolutionary Haoke metal surface processing technology and the complete elimination of residual stress measurement and packaged solutions. Products include vibration aging equipment, Hawk can eliminate stress welding equipment, residual stress measurement equipment, Haoke metal surface processing equipment, cutting fluids, anti-rust oil and cleaning agents, has become the world’s longest line of the residual stress field manufacturer of professional studies. The Hawk can be the introduction of metal surface processing technology to make the surface of metal parts in China to improve the three processing levels, even in the general machine parts can also reach the surface of the mirror effect.

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vibration stress relief

VSR is a resonant device in the form of the substance to exert additional dynamic stress of the workpiece, when additional dynamic stress and residual stress superimposed, meet or exceed the material yield limit, the workpiece micro-or macro-plastic deformation occurs, thereby reducing both chemical components and internal residual stresses and dimensional accuracy to achieve stability.
VSR Technology Overview:
VSR technology, foreign called “Vibrating Stress Relief” (referred to as the “VSR”), designed by a dedicated VSR equipment, so that the workpiece is processed resonance, and in this way a certain resonance energy transfer to the vibration all parts of the workpiece, the workpiece micro-plastic deformation occurs within – the gradual recovery of the lattice is distorted equilibrium. Dislocation slip and re-pinning, and finally to get rid of residual stress and are, thus ensuring the stability of the workpiece dimensional accuracy.
VSR works:
VSR also known as vibration vibration to eliminate stress method, is the artifacts (including castings, forgings, welded components, etc.) in its natural frequency of vibration treatment for tens of minutes, remove and all of its residual stress, the dimensional accuracy to obtain a stable a method. This process has low energy consumption, time is short, the effect is remarkable and so on. At home and abroad in recent years has been rapid development and wide application.
VSR features:
VSR is a real resonance in the form of additional dynamic stress applied to the workpiece, when additional dynamic stress and residual stress superimposed, meet or exceed the material yield limit, the workpiece micro-or macro-plastic deformation occurs, thereby reducing both chemical components and internal residual stress and dimensional accuracy to achieve stability.
VSR reason to get all aspects of general importance, because it has the following characteristics:
1, less investment. Compared with the thermal aging, it does not require a huge time-furnace can save an area with expensive equipment investment. The large-scale modern industrial casting and welding parts, such as thermal stress relief you need to build a large aging aging furnace, is not only expensive, low utilization, and the furnace temperature uniformity is difficult to eliminate the stress of poor results. VSR can be used completely avoid these problems.
2, short production cycle. After months of natural aging at least long-term placement, shall also be required dozens of hours of thermal aging cycle to complete, and the vibration of VSR, only to tens of minutes to complete. Moreover, the VSR subject to site constraints, the workpiece can be reduced from the time before and after transport. If the vibration device placed in the machining production line, not only the production of more compact arrangement, and can eliminate the processing work generated stress on love.
3, easy to use. VSR equipment, small size, light weight, easy to carry. Complete set of equipment, the device itself but also the total weight 65KG. Because space is limited vibration aging treatment without vibration device can be brought to the scene. So this process compared with the thermal aging, easy to use and flexible.
4, strong adaptability. It is not part size and material constraints, from a few kilograms to several hundred tons of the workpiece can easily use the vibration aging technology, especially for large, medium, severe deformation of the workpiece and the workpiece thermal aging, it can show VSR its superior performance.
5, save energy and reduce costs. The resonance frequency of the workpiece under the aging process, energy consumption is minimal. Practice has proved that power with 0.25 to 1 horsepower mechanical vibration exciter can be 150 tons of artifacts. Therefore, a rough calculation of its thermal energy consumption of only 3 to 5% of the time, cost, thermal aging only 8 to 10%.
6, the mechanical properties significantly. After vibration treatment of the residual stress of the workpiece can be eliminated 30% to 55%, eliminating the high tensile stress area than the proportion of low stress District. Therefore, the workpiece can be used to improve strength and fatigue life, reducing stress corrosion. Can prevent or reduce the heat treatment, welding and other processes caused by micro-cracks. Can improve the ability of resistance to deformation of the workpiece, the workpiece accuracy and stability, improve the accuracy of the workpiece to improve the mechanical properties.
7, in line with environmental requirements. The aging process to avoid the waste heat aging of flue gas dust and other sources.
8, the other. VSR is simple, easy to implement mechanized automation. Can avoid the metal parts produced in the thermal aging process warpage, oxidation, decarburization, and hardness and decreased defects.
VSR advantages:
VSR technology compared with traditional thermal aging, has the following advantages:
1, the aging effect. A lot of research and practical applications show that the limitation of the workpiece VSR better than burning coal, heavy oil or gas heat aging furnace, aging furnace and basic with similar results, because not only overcome the VSR uneven oven heat aging eliminate the problems caused by uneven stress, and avoid artifacts due to heat and reduce the impact of its resistance to deformation, it is generally handled by the VSR parts than the average thermal aging stability of the dimensions of the workpiece can be increased by 30% or more.
2, the flexibility. VSR from the use of space technology, workpiece size, shape, weight and other conditions, because only a few dozen kilograms of VSR equipment, it may carry out on large workpieces aging. At the same time can be arranged according to process requirements of different manufacturing processes in the workpiece between the aging process.
3, solve the thermal aging furnace pit problem of environmental pollution. With the increasing demand on the environment, heat aging furnace flue gas pits, dust, slag, the problem has been restricted, VSR is able to completely avoid, which is the vibration aging technology by the National Environmental Protection Agency in recent years has been to promote the cause.
4, less investment. VSR equipment prices generally 6 to 10 million, will be able to meet hundreds of tons of the following parts of aging, while large parts of the furnace thermal aging cellars construction not only requires an investment of hundreds of thousands, and the large area, the application up not flexible, if the workpiece is not worth opening a small furnace, the workpiece is too large Shiyou does not fit heaters.
5, significant energy saving. VSR treatment one week down and only a few degrees electricity, heat aging compared with its base in more than 95% energy saving.
6, and high efficiency. Subject to natural aging six months to one year, more than a dozen thermal aging also needs to dozens of hours of a cycle, and VSR just 10 minutes to an hour to complete.
7, not particularly suitable for high-temperature aging of materials and components to eliminate the stress treatments, such as stainless steel parts, and some metal parts, welding parts and so on mechanical retirement.

Hawking which eliminate stress welding equipment, high-power principle is to use impact tools to promote Haoke twenty thousand times per second, the frequency of the impact of the metal surface, due to Haoke high-frequency, high efficiency and focus under the high-energy, the metal surface have a greater compression plastic deformation; Haoke shock while changing the original stress field, producing a certain value of compressive stress; and to be able to strengthen the impact site

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Hawking welding stress relief

It’s the best aging method that can completely eliminate the welding residual stress and produce the ideal hitting stress(others aging methods to eliminate the residual stress of the situation as follows:30-50% of VSR,40-80% heat aging,80-10% hawking aging).

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HK21B type blind-hole residual stress detector

HK21B type of blind-hole method of residual stress detector Description
 
HK21B residual stress detector used blind-hole method to analysis and research the residual

stress of variety materials and structures,it’s also be used as a stress analysis

instrument to measure the structure in static strength researching and any point

deformation of matieral.
 
It also can measure force, pressure, torque, displacement and temperature when it be

equipped with appropriate sensors.
 
It can measure the measurement and direction of residual stress value directly when using

the computer as a microprocessor and adopting high precision measuring amplifiers,data

acquisition and processor and the measurements without zero,then realizing the automation

of the residual stress measurement.

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Picture

此多媒体陈列厅包含 1 张图像

some pictures about our products and the products processed:

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