• Office of the use of metal products to pay attention to matters

    Modern enterprises are popular use metal containers, metal desk, and in line with the computer, fax machines, photocopiers, etc a variety of business machines, making indoor metal products. In fact, this is not in line with the health requirements of the office decoration. Because of the metal conductive and inductive magnetic field, make indoor field messy, easy to interfere with people's brainwaves, lead to physical discomfort, adverse decision. Therefore, the office should use a wooden desk, the owner of the office of the best use of wood products, not only elegant style, but also conducive to health. There are no large electrical equipment, such as large refrigerators, air conditioners and so on. The magnetic field generated by the electrical appliances has a great impact on the human body. Scientists in the United States in more than a decade ago issued a report pointed out that the long-term life in the high-voltage wire child, the proportion of cancer or leukaemia patients to higher than normal children. More scientists have pointed out that the magnetic field strength of cancer cells Gauss 50-60 Hz in the frequency of the environment, will grow at a rate of 5.2 times.

    2016-08-03

  • Notice of stainless steel products

    Stainless steel is in the air or chemical corrosion medium can resist the corrosion of a high alloy steel, stainless steel is beautiful surface and has good corrosion resistance, need not through surface treatment such as plating color, and play so inherent surface properties, used in the iron and steel, commonly known as stainless steel. Earth kitchen stainless steel products is higher than the general strength of the material, so the punching and shearing need higher pressure, and the knife and the knife gap is accurate can not occur shear failure and work hardening, the best use of plasma or laser cutting. When to use gas cutting or arc cutting, the heat affected zone of grinding and the necessary heat treatment. Stainless steel is in the air or chemical corrosion medium can resist the corrosion of a high alloy steel, stainless steel is beautiful surface and has good corrosion resistance, need not through surface treatment such as plating color, and play so inherent surface properties, used in the iron and steel, commonly known as stainless steel. Stainless steel products processing should pay attention to the following points: 1 stainless steel processing speed should slow down, slow down the feed rate, the general line speed of not more than 130 2 coolant should be water soluble cutting fluid, semi synthetic, cooling, lubrication is good. 3 stainless steel although hard but it also cotton, that is the meaning of soft. All of the above will be stirred up. To grind to stainless steel processing tools. Turning angle is greater than 5 in this way can play a lot of engagement, the efficiency will be high. General knife edge 3MM. 4 because the stainless steel is easy to deform, drilling and tapping is very difficult, so to prevent overheating, in the processing surface injection. 5 in stainless steel welding should pay attention to the size of the welding current. 6 because in the process of cutting tool surface and other non metal or metal combined into the alloy, so that the tool is more likely to rust, I think you can add an anti oxide film or anti oxide film. 7 lathe stainless steel processing set and use YT8 lane. 8. Should pay attention to not let has a very strong corrosive magnetic and stone luxury clean drug exposure to stainless steel surface, if the contact should immediately wash. After the construction, the application of neutral detergent and water washing a surface for the attachment of cement, fly ash matter.

    2016-08-03

  • Attention to the maintenance and maintenance of die casting die for aluminum alloy

    Mold maintenance and maintenance of the mentioned, will be immediately flashed a concept in the minds of many die cast operator that is that of repair work, and he has little to do, in fact, just the opposite. How to mold the fate of all can be said that in the hands of a cast operator. For example, you have a car, opened a few years bad, you can say is those who caused the car wash it? So the mold during the use of the following points to pay special attention to: (1) the use of mold cooling system. Mold cooling water in the correct use of the situation is not only to extend the life of the mold, but also improve production efficiency. In actual production, we often ignore the importance of it. Mold materials are generally dedicated to the production of steel through a variety of processing, and then a good mold steel also has the limit of their use, for example, the temperature. Mold in the state, if the mold temperature is too high, it is easy to will make the surface of the mold core early crack turtle, some die hasn't even more than 2000 die crack turtle on a large area. Even die in production because the mold temperature is too high core has changed color, after measuring even reached more than 400 degrees, such temperature to meet a demoulding agent induced cold state is prone to crack turtle, production of the products are easy to deformation, strain, stick the mould. In mold cooling water use can greatly reduce the use of release agent, such operators will not use mold release agent to reduce the mold temperature. The advantage is that it can effectively prolong the life of the mold, save the die casting cycle, improve the quality of the product, reduce the viscosity of the mold and the strain and the aluminum, and reduce the use of the release agent. Can also reduce the mold temperature due to overheating caused by the top bar and core loss. (2) mold in the production process must be for preheating the mold, to prevent in the cold die suddenly encountered hot metallic liquid and lead to crack turtle, complex mold can use a blowtorch, liquefied gas condition good with mold temperature machine, the relatively simple mold can slow injection preheating to use. (3) the mold points surface clean, this is very troublesome, is also easy to overlook, if not the quality of the mold, production in the mold sub surface inevitably fly edge or dirt, the operator should often to clean up the site, at any time with a small shovel. If the flash is not promptly removed, mold parting surface easily collapsed, killing in the production process of middle distance race aluminum, once cause such consequences, no matter you have what good repair experts, completely repair the possibility of is very small. Aluminum running caused by the consequences, not only increase the cost of die casting, white aluminum waste away, product quality is not stable, especially internal quality, but also increases the difficulty of process parameters are identified, qualified rate will drop a lot, from security considerations, the increased injury rate. In succession, the operators to use kerosene thoroughly to mold sub surface clean again, not only can prevent mold will not be crushed, and after cleaning, the mold is releasing agent residues or other dirt clogging vents open and conducive to injection process medium cavity gas discharge to improve the quality of the products, a team down cleaning surface preferably twice. (4) if mold is equipped with a neutron control, pay attention to the absolute prohibition of die casting machine and mold between the signal line connector, the reason is clear, in daily production, it is difficult to avoid signal line cleaning the bathroom, or is joint bandage, easily broken, resulting in machine tools and short circuit, if the cause of the error signal, light alarm, automatic shutdown delay time, re disturbance signal, the mold top bad. Cause unnecessary loss. Stroke switch attention waterproof.

    2016-08-03

  • Reasons and precautions for the oxidation of metal zipper

    The chemical property of copper alloy in metal zipper is the chemical reaction of acid, alkali, oxidant or reducing agent, and it is easy to change the color of the copper alloy. Cloth on the residual chemicals and metal zipper chain teeth and pull the head or cotter part occur chemical reaction, zipper may will change. This chemical reaction in high temperature, high humidity conditions (sewing products through steam ironing, sealed in a plastic bag and save for a long time) is more likely to occur. This situation does not belong to the quality of the zipper. Little Liu Yu to share the reasons for the discoloration of metal zipper and preventive methods! A copper alloy (nickel alloy, copper, brass) made of metal zipper discoloration: When used in metal products or wool products, metal zipper will be part of the metal oxidation caused by the phenomenon of black teeth. This because the leather leather agent and wool textile products processing bleaching agent, processing process and the residue in the product, the product gas will cause discoloration of the metal zipper. Examples of chemical reactions: oxidation bleaching agent (H2O2), black (CuO) or red (CuO2); Two, rubber band beam of the metal zipper discoloration reasons: Rubber band itself contains sulfide, in order to rubber band beam metal zipper, metal chain will produce curing phenomenon (black). Examples of chemical reactions: conditions for excess of sulfide or HS2 gas, black [CuS] Three, the cause of the discoloration of the contact with acid compounds or chromium compounds. Examples of chemical reactions: acid compounds and chromium compounds [Cr2O3], black [CuO, red [CuO2], or blue [CuSO4]. Four, the reason for the change of the hanging zipper head: Although the hanging zipper head has been done in advance to do anti rust treatment, but because of oxidation is a metal property, in order to reduce discoloration and surface cleaning, please use a copy paper bag. Examples of chemical reactions: wet or steam ironing wet blue 2]. (OH) [Cu How to prevent metal zipper discoloration? 1, avoid metal zipper with acid, alkali, oxidizing agent or reducing agent contact. 2, to avoid ironing clothes for a long time or long-term sealing packing in plastic bags, because the clothing on the residual chemicals under high temperature and high humidity conditions easily teeth with metal zipper, zipper head, cotter parts occur chemical reaction cause discoloration. The degree of chemical reaction can be reduced by the use of anti wet paper and anti moisture agent when necessary. 3, the correct method of washing: washing or put into the dryer, the zipper closed, pull the head fixed. If you open the washing, the front stop will damage the fabric, and the cloth will shrink. Strong alkaline detergent or chlorine bleach to primality wax or oil film coated on the metal zipper. Stop

    2016-08-03

  • The history of the most complete knowledge of the metal materials

    [1] overview A metal material is a general designation of a material consisting of a metal element or a metal element. Including pure metals, alloys, metal materials, metal compounds and special metal materials, etc.. Note: metal oxides (e.g., aluminium oxide) do not belong to metallic materials. 1.1 meaning: The development of human civilization and the progress of the society are closely related to the metal materials. After the stone age appears after the bronze age and the iron age, all with the application of metal material is marked by its age. Modern, wide variety of metal materials has become an important material foundation for the development of human society. 1.2 kinds: Metal materials are usually divided into ferrous metals, non-ferrous metals and special metal materials. (1) black metal, also known as iron and steel materials, including containing iron more than 90% of industrial pure iron, carbon 2% ~ 4% of cast iron containing, containing less than 2% of the carbon steel, and various uses of structural steel, stainless steel, heat-resistant steel, high temperature alloy, stainless steel, precision alloy. The generalized black metal also includes chromium, manganese and its alloys. (2) non-ferrous metals are all metals except iron, chromium and manganese, which are usually classified as light metals, heavy metals, precious metals, semi metals, rare metals and rare earth metals. The strength and hardness of non-ferrous alloys are generally higher than those of pure metals, and the resistance is large and the temperature coefficient of resistance is small. (3) special metal materials, including structural and functional metallic materials for different purposes. There are obtained by rapid solidification process of amorphous metal material, as well as quasicrystal, microcrystalline and nanocrystalline metal materials; and stealth, anti hydrogen, superconductivity, shape memory, wear resistance, vibration damping special alloys and metal matrix composites. 1.3 performance: Generally divided into two types of process performance and performance. The so-called process performance refers to the performance of mechanical parts in the process of manufacturing, metal materials in the set of cold and hot processing conditions. The process performance of the metal material is good or bad, which determines its ability to adapt to the forming process in the manufacturing process. Due to the different processing conditions, the requirements of the process performance is also different, such as casting properties, can be welding, forging, heat treatment, machining, etc.. The so-called performance is the use of mechanical parts in the use of the conditions, the performance of metal materials, including mechanical properties, physical properties, chemical properties, etc.. The use of metal materials is good or bad, which determines its scope of use and service life. In the mechanical manufacturing industry, the general mechanical parts are used in normal temperature, normal pressure and very strong corrosive medium, and in the use of mechanical parts in the process will bear the role of different loads. The performance of a metal material under the action of a load, known as mechanical properties (in the past, also known as mechanical properties). The mechanical properties of metal materials are the main basis for the design and material selection of the parts. The mechanical properties of metallic materials are different, such as tensile, compression, torsion, impact, cyclic loading, and so on. Mechanical properties, such as strength, plasticity, hardness, impact toughness, repeated impact resistance and fatigue limit, etc.. [2] characteristics of metal materials 2.1 fatigue Many mechanical parts and engineering components are subjected to alternating load operation. Under the action of alternating load, although should stress level is less than the material yield limit, but after a long time of stress after repeated cycles, sudden brittle fracture, this phenomenon called the fatigue of metal material. The characteristics of fatigue fracture of metal materials is: (1) the load stress is alternating; (2) the load effect time is longer; (3) the fault is instantaneous; and (4) whether it is plastic material or brittle materials, in fatigue and fracture zone is brittle. Therefore, fatigue fracture is the most common and most dangerous type of fracture in engineering. The fatigue phenomena of metal materials can be divided into the following according to the different conditions: (1) high cycle fatigue: the number of stress cycles at 100000 or more under low stress (working stress is lower than the yield limit of the material, even below the elastic limit). It is one of the most common fatigue damage. High cycle fatigue is generally referred to as fatigue. (2) low cycle fatigue: the number of stress cycles under 10000~100000 in the case of high stress (stress close to the yield limit of the material) or high strain condition. Because the alternating plastic strain plays a major role in this kind of fatigue failure, it is also called plastic fatigue or strain fatigue. (3) thermal fatigue: the fatigue failure caused by the thermal stress caused by temperature changes. (4) corrosion fatigue: the machine parts in alternating load and corrosive medium (such as acid, alkali, water, active gas, etc.) Under the common action, the fatigue damage. (5) contact fatigue: This is refers to the contact surface of machine parts and subjected to repeated in contact stress, pock exfoliation or crushing surface spalling, thus resulting in mechanical failure. 2.2 plastic Plasticity refers to the ability to produce permanent deformation (plastic deformation) without damage under the action of external force. Metallic materials when subjected to tension, length and cross-sectional area to change. Therefore, metal plastic can length elongation and cross-section contraction (section shrinkage) two indicators to measure. Metal material elongation and section shrinkage rate is bigger, said the material of the plastic is better, that is, the material can bear larger plastic deformation without failure. Generally the extension rate is greater than

    2016-08-03

  • Knowledge and common sense of metal jewelry

    - Gold (silver) (1) classification: Gold (silver) according to the different material is divided into two categories, one is homogeneous materials of gold (silver), refers to the gold (silver) surface treatment; another type of gold (silver) for heterogeneous materials, that is, the Gold (silver) on the surface of gold (silver) treatment. (2) standard: Internationally accepted gold plated jewelry standard is: good gold plating layer thickness of 10 microns ~25 microns, generally 2 microns ~3 microns, such as under 0.18 microns is inferior. (3) performance and maintenance: To avoid friction, so as not to fall off the surface layer; Not long time and the human sweat gland direct contact, summer should not be worn; Avoid direct contact with acid and alkali substances such as soap and so on; From the cosmetics, avoid contact with cosmetics. The gold-plated copper (silver) with high hardness, and alloy gold (silver) small hardness and wear to avoid hard pull hard pull. (4) identification: 1, look at the color: gold (silver) jewelry is generally good gloss, high brightness, color than gold, silver really shallow. 2, weight: gold (silver) in the hands of weight than gold, silver jewelry, much lighter. 3, listen to the voice: the gold (silver) jewelry thrown on the table or the ground, the sound of teaching to teach boring. Gold, silver and it's voice is very clear. 4, gold and silver jewelry in weight than gold (silver) to be much heavier, but the hardness of teaching soft, real gold Zhenyin wearing light and gold (silver) and vice versa. 5, in addition, copper plated platinum jewelry and platinum jewelry is very similar, and the gloss is higher than platinum, the surface is smooth, never change. Two, silver, silver Thai silver. (1) knowledge: silver, also known as "niello" is put in the silver jewelry silver, lead and sulphur mixture of melt, and the glassy state of a cap layer is formed. (2) the performance: the silver coating gold layer loose, the black, and the silver bright bright bright contrast, produces the special visual effect. Because of the special anti old treatment, Ukrainian silver jewelry is not only long-term change, The surface hardness is greatly enhanced, because the texture and color have a unique style, making the rough and simple jewelry. Sterling Silver. (1) level: 625, 725, 925 (2): white, fine, elegant, smooth surface, good ductility, and sulfide contact in the air will turn black. Classification of silver Silver jewelry can be divided into two categories of fine and fine, they are as follows: (1): fine silver silver thousandth of not less than 990 silver said. Because it is too soft, easy to wear, and therefore more used to make silver, but not suitable for jewelry production. (2): Wenyin silver thousandth of not less than 925 known wenyin. Also known as the "925 silver", sterling silver is usually added 7.5% mixed with 92.5% silver copper. Due to the incorporation of copper, the finished product is polished. After the gloss, than pure silver bright beautiful, so often used in jewelry and silverware. The characteristics of two silver (1) the low melting point of silver, easy smelting, good ductility, because silver is good, it is easier to form. (2) did not respond to most acids, easy to produce all kinds of jewelry, processed silver surface smooth and elegant. (3) the silver time will appear black, mainly due to the oxidation of sulfur in the air and black. Three silver jewelry identification (1) color: eye, looks white, shiny, fine. (2) bending method: hand bending silver jewelry, easy to bend easily broken with high purity. (3) casting method: the silver jewelry from thrown down on the bedplate, bouncing is not high and "poof tick tock" sound is really silver or high fineness of silver jewelry. In addition, silver, color should be darker than platinum; teach soft hardness, not easy to rust, weight. Four silver jewelry maintenance (1) do not wear silver jewelry at the same time to wear other metal jewelry, so as to avoid the impact of deformation. (2) to avoid contact with water vapor and chemical products, can not wear it to swim, especially in the sea. (3) if you have enough time to wear cotton to wipe clean, and put it in jewelry box. Silver (4) will be due to oxidation and black, can be used to rub silver cloth or wash water, also can using a soft bristle brush dipped in toothpaste scrub, after washing to dry with cotton can be. Three, alloy 1, knowledge Alloy is a synthetic metal, its scope is very wide, made of alloy jewelry quality is worse than that of copper, hardness is not strong, education soft, alloy jewelry price is cheap, styles of jewelry more fancy, but not hard pinch and is easily broken. And the copper on the contrary, its toughness is better. If there is a silver or bronze alloy, in general, the copper content is higher, alloy color is red, the color of the alloy is green. 2, maintenance (1) do not use bleach. The chlorine in the water will make the alloy appear pit marks, break down the alloy, and even erode the weld. (2) avoid washing powder, detergent and toothpaste with abrasive material. 3, identification Alloy hardness is not strong, but the toughness is good, good smoothness, make jewelry more fancy, with hand weigh weight significantly than other metal jewelry to, alloy hole is very small. Four, stainless steel

    2016-08-03

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