Vacuum Heat Treatment Furnace: 八月 2016

2016年8月30日星期二

Green heat treatment of the vacuum furnace

Vacuum heat treatment is one more advanced way of mold heat treatment. Vacuum high-pressure gas quenching furnace is the most ideal realization of vacuum heat treatment equipment. Vacuum stove has not decarburization, not the effect of oxidation, uniform temperature, heating and cooling rate controlled, can achieve different technological process, vacuum furnace with no pollution, is internationally recognized as "green heat treatment".
Mould has the characteristics of the vacuum heat treatment technology, it is desperately needed in the mould manufacturing, such as preventing heating oxidation and decarburization, vacuum degassing and degassing, eliminate hydrogen embrittlement, so as to improve the plasticity and toughness of materials (parts) and fatigue strength. Vacuum heating slowly, parts smaller temperature difference between inside and outside factors, determines the parts and small deformation caused by vacuum heat treatment process.
Vacuum heat treatment is to point to the whole and part of heat treatment process in a vacuum, vacuum heat treatment can achieve almost all of the conventional heat treatment process of heat treatment can involve, but heat treatment quality greatly improved. Compared with conventional heat treatment, vacuum heat treatment at the same time, it can realize no oxidation and decarburization, carburizing, can remove phosphorus crumbs on the surface of the workpiece, and has the effect such as degreasing degassing, so as to achieve the surface brightness purification effect.

2016年8月26日星期五

Quality of vacuum heat treatment furnace has the advantages of good energy-saving safety and less pollution

Vacuum heat treatment furnace vacuum heat treatment of vacuum technology and heat treatment combining two professional comprehensive technology, refers to the whole and part of heat treatment process in a vacuum. Our country could be divided into low, medium and high vacuum and high vacuum. At present most of the vacuum heat treatment furnace work vacuum degree in 1.33 ~ 1.33 x 10 ˉ & sup3; Pa.
Vacuum heat treatment can achieve almost all heat treatment process, such as quenching, annealing, tempering, carburizing, nitriding, during the quenching process can realize gas quenching, quenching oil, water nitrate quenching, quenching, etc., can also be vacuum brazing, sintering and surface treatment, etc. Vacuum heat treatment furnace thermal efficiency is high, which can realize the rapid heating and cooling, which can realize no oxidation and decarburization, carburizing, can remove phosphorus crumbs on the surface of the workpiece, and has the effect such as degreasing degassing, so as to achieve the surface brightness purification effect. Generally speaking, the processed workpiece in the heating furnace is slow, and internal temperature difference is small, the thermal stress is small, so little deformation. Product qualified rate is high. Can reduce costs, have degassing effect, so as to improve the mechanical properties of the work and life. Good working environment, safety operation, no pollution and no pollution. Be processed workpiece no hydrogen embrittlement risk, to prevent surface of the titanium and refractory metal shell hydrogen embrittlement, stability and repeatability of vacuum heat treatment process. A series of advantages, the development of vacuum heat treatment equipment and technology is more and more attention and applied more and more widely.

2016年8月24日星期三

Heat treatment production technology and craft work

(1) heat treatment factory for specific products or equipment, necessary to direct production process documents. Such as process planning (i.e., process CARDS), safety operation procedures. Process equipment drawings and files, heat treatment parts list and process route, etc.
(2) indirect direct production process work must according to the file. Such as heat treatment furnace process claim, tooling design specification and sign technical records (or technical agreement), etc.
(3) general process files. Such as process rules, a manual, quality inspection procedures, safety regulations, etc.
Different tissue types have different production process management system, to meet the needs of the production, ensure the quality of heat treatment, must have corresponding process files. General of small and medium-sized machinery factory has the following kinds:
1) heat treatment parts list: summarize reflect parts of material, heat treatment type and requirements (including its process and heat treatment it proposed supplementary heat treated parts and process itself), part number, size and weight, etc., is a production process analysis, production preparation and organization of important documents.
2) heat treatment process card: in the form of a text and graphics to express parts heat treatment process of the basic types of process card mouth is there a special process for a certain parts or process card and on the similar and different specifications of the parts or general process card of various kinds of heat treatment process.
3) process code: namely must follow the principle of heat treatment process.
4) heat treatment craft equipment files, including the design specification, drawings and process equipment of fine table, etc.
5) heat treatment furnace of temporary heat treatment technology: because of the temporary change production conditions or for special orders, material substitution and new products, new technology of batch test using short-term effective process.

2016年8月19日星期五

Casting heat treatmen

For casting engineers and mechanical structure design engineer, heat treatment is a very meaningful, and with a very high value to improve the method of material quality, through heat treatment can change or influence the organization and properties of cast iron, and can obtain higher strength, hardness, and improve the wear resistance and so on.
Because the purpose of so many different kinds of heat treatment, the basic can be mainly divided into two categories, the first category is the organization structure will not change or by heat treatment should not be changed, the second is the basic organizational structure change. The first heat treatment procedure, is mainly used to eliminate internal stress, and the internal stress is in the process of casting due to different cooling condition and conditions. Organization, strength and other mechanical properties, no obvious changes due to heat treatment. For the second heat treatment, al qaeda has had the obvious change, can be roughly divided into five categories: (1) the softening annealing: its purpose is to decompose the carbide, its hardness is reduced, and improve the processing performance, for the spherical graphite cast iron, its aim is to obtain iron group has a very high fertility. (2) the normalization processing: mainly used to improve or made entirely wave to iron casting for mechanical properties of uniform distribution. (3) hardening: mainly in order to obtain a higher hardness and abrasion strength, at the same time to the surface of the high wear-resisting properties. (4) surface hardening treatment: mainly for surface hardening layer, and received very high surface wear-resisting properties. (5) precipitation hardening treatment: mainly in order to obtain high strength and elongation is not so violent change.

2016年8月17日星期三

On the development of the auto parts heat treatment of heat treatment equipment

Heat treatment is an important process in the process of automobile manufacturing, engine, gearbox, axle and other important components require after heat treatment, to ensure the safety, reliability and service life of the vehicle. With the rapid development of automobile industry, the domestic auto parts heat treatment craft equipment is increased rapidly, advanced heat treatment equipment for the popularization and application in automobile industry. However, in the process of auto parts production used as heat treatment equipment manufacturers, also deeply realize the domestic heat treatment equipment has yet to be improved and improving in many ways.
1. The standard heat treatment equipment needed
Along with the rapid development of automobile industry, auto parts for meeting the requirement of mass production, since the late 20th century, domestic heat treatment equipment manufacturers have developed a high degree of automation, reliable operation, process duplicate good equipment, such as push rod type carburizing production line, the sealed box furnace production line, mesh belt conveyor production line and production line for isothermal normalizing, etc. Due to the various equipment manufacturers based on its own technology conditions and production level, in the development process with its own set of equipment manufacture standard, industries and countries in the aspect of heat treatment equipment acceptance also does not have a complete standard, so the user feel nowhere when purchasing equipment, is always in a passive role. Therefore, it is important that the proposed standard management as soon as possible the organization experts to develop a complete heat treatment equipment acceptance standard, is advantageous to the heat treatment and heat treatment equipment manufacturer parts manufacturer along a healthy development track.

2016年8月12日星期五

High frequency heat treatment of several common heat treatment concept

Normalizing: steel or steel heated to a critical point AC3 or ACM more appropriate temperature keeping time, cooled in the air after get pearlite heat treatment process of the organization.
2. Annealing: hypoeutectoid steel workpiece heated to above AC3 20 to 40 degrees, heat preservation after a period of time, with the slow cooling furnace (or buried in the sand or lime cooling) to 500 degrees Celsius inair cooling heat treatment process
3. The solution heat treatment: keep single-phase zone temperature alloy is heated to high temperature, the excess phase dissolves into solid solution, and then rapidly cooling, to get the supersaturated solid solution heat treatment process
4. Aging: alloy after solution heat treatment or cold plastic deformation at room temperature or slightly above room temperature to keep, the phenomenon of its performance change with time.
5. Solid solution treatment: make various phase in the alloy dissolves, solid solution and improve the toughness and corrosion resistance performance, eliminate stress and softening, in order to continue processing molding
6. Aging treatment: in the precipitation strengthening phase temperature heating and heat preservation, make the strengthening phase precipitates out, hardening, increase the intensity
7. Quenching: the steel austenitizing with proper cooling, cooling speed after all or certain parts within the cross section within the scope of martensite and unstable organization structure change of heat treatment process
8. Tempering: after hardening of the workpiece heated to a critical point AC1 under proper temperature keeping time, method of cooling, then used to meet the requirements to obtain required by the organization and performance of heat treatment process

2016年8月9日星期二

What is a vacuum heat treatment furnace?

Two professional vacuum heat treatment of vacuum technology and heat treatment technology that combines an integrated, refers to the whole and part of heat treatment process in a vacuum. Our country could be divided into low, medium and high vacuum and high vacuum. At present most of the vacuum heat treatment furnace work vacuum degree in 1.33 ~ 1.33 x 10 ˉ & sup3; Pa.
Vacuum heat treatment can achieve almost all heat treatment process, such as quenching, annealing, tempering, carburizing, nitriding, during the quenching process can realize gas quenching, quenching oil, water nitrate quenching, quenching, etc., can also be vacuum brazing, sintering and surface treatment, etc. Vacuum heat treatment furnace thermal efficiency is high, which can realize the rapid heating and cooling, which can realize no oxidation and decarburization, carburizing, can remove phosphorus crumbs on the surface of the workpiece, and has the effect such as degreasing degassing, so as to achieve the surface brightness purification effect. Generally speaking, the processed workpiece in the heating furnace is slow, and internal temperature difference is small, the thermal stress is small, so little deformation. Product qualified rate is high. Can reduce costs, have degassing effect, so as to improve the mechanical properties of the work and life. Good working environment, safety operation, no pollution and no pollution. Be processed workpiece no hydrogen embrittlement risk, to prevent surface of the titanium and refractory metal shell hydrogen embrittlement, stability and repeatability of vacuum heat treatment process. A series of advantages, the development of vacuum heat treatment equipment and technology is more and more attention and applied more and more widely.

2016年8月4日星期四

The development of the vacuum heat treatment and its prospect

Vacuum heat treatment is to point to the metal parts in a vacuum or vacuum before they are inert gas under the condition of heating, and then quenching cooling technology in the oil or gas. Because the vacuum heat treatment, the workpiece basic oxidation, steel decarburization, use air convection heating method still can make uniform heating, reduce the temperature difference between the surface and center and thus reduce the distortion. Now it has become a high quality mould and indispensable preferred heat treatment process. More valuable is that vacuum heat treatment in the process of production material won't produce any pollution environment, to be generally accepted belong to the category of cleaner production technologies. It is no exaggeration to say, vacuum heat treatment has become the main sign of advanced heat treatment production technology.
The current development of vacuum heat treatment is the main characteristic of convection heating and high pressure gas quenching, acetylene low pressure carburizing, ion carburizing, carburizing and other aspects. In order to make the heat treatment of the counterpart in the production of technical reformation can correctly understand and return to the development trend of vacuum heat treatment, thus can choose appropriate, the popularization and application.

2016年8月3日星期三

Development of vacuum heat treatment furnace vacuum technology

Development of vacuum heat treatment process is inseparable from the development of equipment to improve the level of equipment and technology to adapt to the technological requirements, they often closely associated with the development of technology supporting parts.
Pump development
Before 1873 incandescent bulbs invention, is mainly obtained by a piston-type air pump vacuum, but only reached 0.25 Torr. Then a higher degree of vacuum tube manufacturing technology requirements, promoting the development of vacuum technology, which have appeared in a variety of pumps: rotary mercury pump (1905), oil seal rotary pump (1907), molecular pump (1913) and diffusion pump (1915). The invention of which the diffusion pump, the vacuum technology into the high vacuum (10-8 hair around) stage. With the development of modern science and technology, such as accelerators, thermonuclear reactor, large vacuum care, etc., are required to be able to establish the necessary degree of vacuum in the space of a large volume. Thus, by the early 1960s, the diffusion pump exhaust rate has reached capacity of tens of thousands liters / sec.
However, the required vacuum heat treatment, the general reach 1x10-2 ~ 1x10-4 Torr enough, only in exceptional circumstances, only with 1x10-5 ~ 1X10-6 Torr. So common vacuum pump vacuum heat treatment furnace, by a mechanical pump and an oil diffusion pump composed of evaporation.

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