12 several common metal surface processing technology CNC Machine parts|easoar-soon
By jett NG | 11 August 2021 | 0 Comments

12 several common metal surface processing technology CNC Machine parts|easoar-soon

12 several common metal surface processing technology CNC Machine parts|easoar-soon

 

Anodic oxidation treatment of aluminum alloy die casting process| prototype manufacturing

 

Aluminum alloy die casting process in the market, has been a very mature processing technology, then what is the aluminum alloy die casting process is how to turn aluminum water into finished products? With these problems, Xiaobian I slowly tell you about the aluminum alloy die casting process and anodic oxidation treatment, Xiaobian I will give you a detailed explanation of the two processes from beginning to end.black anodize aluminium

First of all, let's take a look at the aluminum alloy die casting process flow chart:

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In aluminum alloy die casting technology is a very complex process system, far beyond our intuitive to check the process flow diagram is more complicated, the next, we explain the principle of the die casting technology, and actually die casting technology is to die casting, aluminum alloy die-casting machine, three main factors, such as the perfect combination of a machining process, and when we die casting, Metal will fill the cavity according to the process, the pressure, speed, temperature, time and other factors to get a unified control process. General aluminum alloy die-casting plant on the market are conducive to high pressure high pressure liquid metal into some kind of precision metal molds, under the action of stress, the metal liquid cooling solidification, eventually forming die casting, aluminum alloy die casting technology of most common general can be divided into two kinds, the cold and hot chamber die casting technology of two basic ways, ok, this is the principle of aluminum alloy die casting technology.

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Next we of anodic oxidation process in, believe that everyone knows that when aluminum alloy die casting molding, in order to improve the aluminum workpiece using time, improve the abrasion resistance and compressive coefficient, general will do next an anodic oxidation treatment process, the anode oxidation process, general oxidation processing plant on the market are using sulfuric acid electrolyte, electrolysis, The process of forming anodic oxidation film on the surface of aluminum alloy die casting is called anodic oxidation of aluminum sulfate.

12 several common metal surface processing technology

Surface treatment is to form a surface layer with some or more special properties on the surface of materials by physical or chemical methods. Through the surface treatment can improve the product appearance, texture, function and other aspects of the performance. The use of modern physics, chemistry, metallics and heat treatment and other disciplines of technology to change the condition and nature of the surface of parts, so that it and the core material for optimal combination, in order to achieve the predetermined performance requirements of the process method, called the surface treatment process. The role of surface treatment:

 

Improve surface corrosion resistance and wear resistance, slow down, eliminate and repair material surface changes and damage.

 

To enable common materials to obtain a surface with a special function.Easoon provides CNC Machine parts,prototype manfacturing service,anodized aluminium,black anodize aluminium

 

 

Save energy, reduce costs and improve the environment.

 

Metal surface treatment technology can be divided into four categories: surface modification technology, surface alloying technology, surface conversion film technology and surface coating technology.

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1, surface modification technology 1, surface quenching surface quenching refers to the heat treatment method to strengthen the surface of parts by using rapid heating to austenitize the surface without changing the chemical composition of the steel and the core structure. The purpose of surface quenching is to obtain a high hardness, high wear resistance surface, and the core still retains the original good toughness, often used in machine tool spindles, gears, engine crankshafts, etc. Surface quenching is a local quenching method in which the surface layer of a steel piece is quenched to a certain depth while the core part remains unquenched. Surface quenching by rapid heating, the surface of the steel parts quickly to the quenching temperature, in the heat is not enough to reach the core of the workpiece immediately cooling, to achieve local quenching.

The main methods of surface quenching are flame quenching and induction heating, commonly used heat sources such as aerobic acetylene or oxypropane flame, etc.

 

2, wire drawing,

 

Wire drawing refers to the metal forced through the mold under the action of external forces, metal cross-sectional area is compressed, and obtain the required shape and size of the cross-sectional area of the surface treatment method known as the metal wire drawing process. Wire drawing can be made into straight lines, messy lines, ripples and swirling lines according to decorative needs. It is a kind of surface treatment means to form lines on the workpiece surface by grinding products and play a decorative effect. According to the different lines after drawing can be divided into: straight line drawing, drawing, ripple, swirl. The drawing process can give the metal surface a non-mirror-like metallic luster, and the drawing process can also eliminate subtle defects on the metal surface. Wire-drawing treatment can also be called sweeping sand, sweeping nylon, and so on. Usually according to the surface effect is divided into straight wire and messy wire. Straight silk is also called hair silk, messy silk is also called snow pattern, the type of silk is good or bad has great subjectivity. Each user has different requirements for the surface line and different preferences for the line effect. Some people think hair looks good, some people like snow patterns, some people like long silk, some people like short silk. The effect of wire lines is often difficult to describe and define because of the variety of changes. Instead, the effect of wire lines is determined by determining the processing method of wire drawing, the grinding products used, and the technological parameters.Easoon provides CNC Machine parts,prototype manfacturing service,anodized aluminium,black anodize aluminium


 

 

3, polishing

 

Polishing is a finishing method to modify the surface of parts. Generally, only smooth surface can be obtained, and the original machining accuracy can not be improved or even maintained. Ra value after polishing can reach 1.6~0.008μm depending on the pre-processing conditions. Generally divided into mechanical polishing and chemical polishing. Polishing The finishing of the surface of a work piece by means of a flexible polishing tool and abrasive particles or other polishing media. For different polishing processes: rough polishing (basic polishing), medium polishing (finishing) and fine polishing (finishing), the appropriate polishing wheel can achieve the best polishing effect and improve the polishing efficiency. Improve the dimensional accuracy or geometric accuracy of the workpiece, get a smooth surface or mirror gloss, but also can eliminate gloss.

Process: chemical or electrochemical) in addition to the oil to hot water to wash, the flow of water to wash - derusting sulfuric acid (10%) - the flow of water to wash - chemical polishing - the flow of water to wash - and - surface treatment process that under the flow of water to wash - into working environment: traditional polishing process bad work environment, during the process of polishing sand, iron filings, dust, etc., serious environmental pollution; Processing efficiency: manual polishing; Hokereng process is to replace the mill with the car, the line speed can reach 50-80 m/min, the feed can reach 0.2-0.5mm/r, which is equivalent to the efficiency of the semi-finishing car. Paving consumption: polishing needs to consume polishing wheel, abrasive, abrasive belt and other accessories; Adaptability: polishing can be processed plane and other simple surface, for the curved surface can not be processed. If R arcs, curved surfaces and other complex surfaces are processed, Hawkernen polishing process can be used. 2. Surface alloying technology

 

The typical process of surface alloying is chemical surface heat treatment. It is a heat treatment process that places the workpiece in a specific medium for heating and insulation, so that the active atoms in the medium penetrate into the surface of the workpiece to change the chemical composition and organization of the surface of the workpiece, and then changes its performance.Easoon provides CNC Machine parts,prototype manfacturing service,anodized aluminium,black anodize aluminium

 

 

Compared with surface hardening, chemical surface heat treatment not only changes the surface structure of steel, but also changes its chemical composition. According to the infiltration of different elements, chemical heat treatment can be divided into carburizing, nitriding, multiple infiltration, infiltration of other elements and so on. Chemical heat treatment process includes decomposition, absorption and diffusion of three basic processes.

 

The two main ways of chemical surface heat treatment are carburizing and nitriding.

 

The purpose of contrast carburizing and nitriding is to improve the surface hardness, wear resistance and fatigue strength of the workpiece, and keep the good toughness of the core part. Improve workpiece surface hardness, wear resistance and fatigue strength, improve corrosion resistance. Low carbon steel containing 0.1-0.25%C. High carbon decreases core toughness. It is medium carbon steel containing Cr, Mo, Al, Ti, V. Common methods of gas carburizing, solid carburizing, vacuum carburizing gas nitriding, ion nitriding temperature 900 ~ 950℃500 ~ 570℃ surface thickness is generally 0.5 ~ 2mm not more than 0.6 ~ 0.7mm widely used in aircraft, cars and tractors and other mechanical parts, such as gear, shaft, camshaft, etc.. Used for parts with high wear resistance and precision and parts with heat resistance, wear resistance and corrosion resistance. Such as instrument small shaft, light load gear and important crankshaft, etc. Application of surface alloying technology 1, replace electroplating products electroplating is carried out under the action of current, for complex workpiece due to uneven current distribution resulting in uneven coating thickness. Surface alloying is a chemical reaction, pervasive, no matter how complex the workpiece can ensure the alloy layer uniformity. Electroplating coating is usually a single metal (chromium) crystal, poor surface adhesion, low hardness, easy to peel off, surface alloying coating for amorphous alloy, strong adhesion, high hardness, not peeling off. Plating often adopts multi - metal layer plating, technology complex lock, high processing cost. Surface alloying is finished by chemical raw materials, and the processing cost is low. 2, instead of part of the stainless steel products stainless steel prices are expensive, made of high commodity prices. Some items with ordinary carbon steel corrosion rust, stainless steel and "big only small use", the use of ordinary carbon steel surface alloying treatment, after the treatment of surface corrosion resistance, wear resistance, hardness are greatly improved, and the price is low. Such as: kitchen utensils, decorative plates, signs and so on. 3, enhance the performance of building hardware products some carbon steel products (such as nails, screws, etc.) should not be coated with antirust paint on the surface, after a long time of use will rust, corrosion, affect the stability of the building structure, after surface alloying treatment, can solve these defects. Some other carbon steel products (such as water pipes, faucets, hinges, etc.) after surface alloying treatment, not only have the function of rust prevention, but also play a beautifying effect. 3. Surface conversion membrane technology

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A, anodic oxidation mainly refers to the anodic oxidation of aluminum and aluminum alloy. Anodic oxidation is to immerse aluminum or aluminum alloy parts in acidic electrolyte, under the action of external current as an anode, on the surface of the parts to form a corrosion prevention oxidation film firmly combined with the matrix. This layer of oxide film has protective, decorative, insulation, wear resistance and other special characteristics. Before anodizing, polishing, degreasing, cleaning and other pretreatments are required, followed by washing, coloring and sealing. Mainly is the anodic oxidation of aluminum, is the use of electrochemical principle, in the surface of aluminum and aluminum alloy to generate a layer of Al2O3 (alumina) film. This layer of oxide film has protective, decorative, insulation, wear resistance and other special characteristics.

 

Process flow:

 

Monochrome gradient: polishing/sand/drawing to oil removal, anodic oxidation - and - dyeing - hole sealing - drying double color: 1) polishing/sand/drawing to oil removal, covered anode oxidation to anode oxidation of 1, 2 - hole sealing - drying (2) the polishing/sand/drawing to oil removal, anodic oxidation 1 - radium vulture - anodic oxidation 2 - hole sealing - drying.

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The technical characteristics of anodic oxidation are: 1, enhance the strength; 2, achieve any color except white; 3, Ni-free sealing hole, to meet the requirements of Europe, the United States and other countries without nickel. The yield level of anodic oxidation is related to the cost of the final product. The key to improve the yield is the appropriate dosage of oxidizing agent, the appropriate temperature and the current density, which requires the manufacturers of structural parts to continuously explore in the production process and seek for a breakthrough.

4, surface coating technology 1, vacuum plating

 

Vacuum plating is a surface treatment process in which various metal and non-metal films are deposited on the metal surface by means of distillation or sputtering under vacuum conditions. PVD vacuum plating, full name physical vapor deposition, is a kind of industrial manufacturing process, is mainly the use of physical process to deposit thin film technology.

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Process: cleaning before PVD → vacuuming into furnace → cleaning target and ion → coating → coating end, cooling out → post-treatment (polishing, AFP)

 

PVD (Physical Vapor Deposition) can be used to coat the metal surface with high hard plating and high wear resistance. By vacuum plating, a very thin surface coating can be obtained. Meanwhile, PVD has the advantages of fast speed, good adhesion and less pollutants. According to the different process, vacuum plating can be divided into vacuum evaporation, vacuum sputtering, vacuum ion plating.

2, electroplating

 

Electroplating is an electrochemical and REDOX process, the use of electrochemistry to make the surface of the metal attached to a layer of metal film process so as to prevent corrosion, improve the wear resistance, electrical conductivity, reflective and enhance the role of a beautiful technology. Take nickel plating as an example: the metal parts are immersed in the metal salt (NISO4) solution as the cathode, the metal nickel plate as the anode, after connecting the DC power supply and then the parts will be deposited on the nickel plating layer. Electroplating methods are divided into ordinary electroplating and special electroplating.Easoon provides CNC Machine parts,prototype manfacturing service,anodized aluminium,black anodize aluminium

 

 

Process: pretreatment → cyanide-free alkali copper → cyanide-free white copper tin → chromium plating

 

Advantages: 1, high gloss coating, high quality metal appearance; 2. SuS, Al, Zn, Mg, etc.; The cost is lower than PVD.

 

Disadvantages: poor environmental protection, greater risk of environmental pollution

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