AJM MACHINING PDF

Abrasive jet machining (AJM) utilizes a high velocity jet of abrasives to remove material from work surface by impact erosion. Get an overview of AJM process. AJM Advantages: This process is significant for machining breakable, heat resistant materials like ceramic, glass, germanium, mica etc. components of abrasive jet machining Abrasive delivery system . Abrasive Jet Machining In AJM, generally, the abrasive particles of around.

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Benedict Manufacturing Engineering and Materials Processing Hard materials and materials of high strength can be easily machined. There are some allowances which are responsible for the difference in the dimensions of the casting and the pattern However, various accessories including pipeline must be capable enough to handle such high pressure without failure.

Different Types of Welding Defects. Advanced Machining Processes by V. Smooth surface finish can be obtained. Sometime movement of work table is controlled by servo mechanism. It can be utilized for cutting, drilling, polishing, deburring, machinng etc. A fine abrasive jet is rendered by the nozzle. I wanted to sjm about the movement of the nozzle using servos.

It consists of gas supply system compressorfilter, pressure regulator, mwchining chamber, nozzle assembly and the work holding device.

Abrasive jet machining – Wikipedia

From Wikipedia, the free encyclopedia. For polishing and coating removal purposes, glass beads and crashed glass are conventionally used. The pressure of this mixture is regulated and sent to nozzle. Abrasive particles cannot be reused.

In the mixing chamber, abrasive powder is fed. Larger grit size tends to produce larger cavity and thus MRR improves with the sacrifice of qjm finish.

List of factors that affect abrasive jet machining performance. Compressor unit also consists of drier and filter.

Abrasive Jet Machining (AJM) Process Advantages and Disadvantages – Mechanical Engineering

Cutting and drilling hole —AJM can also be utilized for cutting various shapes as well as for drilling holes.

The distance of the nozzle from the workpiece affects the size of the machined area and the rate of material removal. The main advantages are its flexibility, low heat production, and ability to machine hard and brittle materials. It filters mschining gas before entering the compressor and mixing chamber.

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Engraving —As an alternative to laser beam machining, abrasive jet machining can also be applied for incising purposes irrespective of chemical and electrical properties of work material. Advantages of abrasive jet machining Suitable for removal of deposits on surface Wide range of maachining finish can be obtained Process is independent of electrical or thermal properties No thermal damage of workpiece Suitable for nonconductive brittle materials Low capital investment Disadvantages of abrasive jet machining Not suitable for soft and ductile materials Abrasives are not reusable Abrasive collection and disposal are problematic Inaccurate cutting and drilling stray cutting Limited nozzle life Applications of AJM Abrasive jet machining can be advantageously utilized for multifarious purposes including surface cleaning, deburring, abrading and even making holes.

The surface machined can have good finish by controlling the grain size mainly.

Subscribe in a reader. This gives easy, accurate and precise control and is suitable for cutting intricate profiles and contours.

The lodged out or wear particle is carried away by machning air or gas. Indefinite increase in MRR is not practically feasible because of limited capability of equipment and accessories. Abrasive jet machining can be advantageously utilized for multifarious purposes including surface cleaning, deburring, abrading and even making machijing.

Basic purpose of carrier gas in abrasive jet machining is to accelerate fine abrasive particles by momentum transfer. This process is best suited for machining super alloys and refractory type of materials, and also machining thin sections of hard materials and making intricate hard holes.

The process can be easily controlled to vary the metal removal rate which depends on flow rate and size of abrasive particles. Nonconventional Machining by P.

Compressed air is then passed into the mixing chamber. Abrasive jet machining is best suited for machining brittle and heat sensitive materials machlning glass, quartz, sapphire, ceramics etc, It is used for drilling holes, cutting slots, cleaning hard surfaces, deburring, polishing etc.

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Process parameters and their influence on AJM There are many factors that can influence abrasive jet machining performance. You may also Read: By using this site, you agree to the Machinign of Use and Privacy Policy. However, ductile and brittle machininy behave differently in indent formation, and thus size of indentation created by the impact of single abrasive grit is different for ductile and brittle materials.

It compresses the carrier gas to a pressure of 15 — 20bar. Abrasive jet machining AJMalso known as abrasive micro-blastingpencil blasting and micro-abrasive blasting[1] is an abrasive blasting machining process that uses abrasives propelled by a high machinin gas to erode material from the workpiece. Applications of AJM process.

Nozzle is made of hard and resistant material like tungsten carbide. Effects of carrier gas on abrasive jet machining performance. Its purpose is to mix abrasives with pressurized carrier gas.

Abrasive Jet Machining – Process, Parameters, Equipment, MRR

Working principle of abrasive jet machining with sketch. When gas is compressed to high pressure, steam may condense and tiny water particles can create a larger globule after agglomerating with abrasives. If you continue to use this site we will assume that you are happy with it. MRR can be enhanced by proportionally increasing both the abrasive flow rate and gas flow rate at same rate so that mixing ratio remains constant.

Functions of nozzle in abrasive jet machining Can you choose AJM nozzle with arbitrary inner diameter? As discussed earlier, shape, size, strength, material and flow rate of abrasive can influence machining performance.

When an abrasive particle like Al2O3 or SiC having sharp edges hits a brittle and fragile material with a high speed, it makes dent into the material and lodges a small particle from it by a tiny brittle fracture. The operating elements in AJM are abrasive, carrier gas and the nozzle as schematically shown in the following Figure.