Abrasive jet machining (AJM) is one of the modern machining processes where high velocity jet of abrasives mixed with dehumidified pressurized gas is made. PDF | Abrasive jet machining (AJM) is a manufacturing technology based on erosion localization and intensification. AJM has a progressively. PDF | As Abrasive jet machining (AJM) is similar to sand blasting and effectively removes hard and brittle materials. AJM has been applied to rough working.
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Distance from the work surface to the tip of nozzle in abrasive jet machining set-up is called Stand-Off Distance, abbreviated as SOD. Engraving Engraving is the process of incising pattern, letter, art or design on a solid surface for decorative or artistic or formal purposes.
Views Read Edit View history. However, pure oxygen is not used as it can quickly oxidize the work surface. Although sand blasting or grit blasting is economical for this purpose, abrasive jet machining AJM can also be applied if tight quality of finished surface is desired. Abrasive materials have varying strength or hardness. The pressure of this mixture is regulated and sent to nozzle. Cutting and drilling hole —AJM can also be utilized for cutting various shapes as well as for drilling holes.
Non-corrosive abrading of ceramic materials can be carried out by abrasive jet machining AJM. It is a mixture of a gas or air and abrasive particles.
A close working chamber, inbuilt with proper exhaust system, is usually maintained in order to avoid environmental pollution.
It compresses the carrier gas to a pressure of 15 — 20bar.
Abrasive Jet Machining (AJM) Process Advantages and Disadvantages – Mechanical Engineering
When an abrasive particle like Al2O3 or SiC anrasive 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.
Such cleaning processes include— Removal of oxide or corrosive layer from surface Removal of paint or coating layer Removal of stain mark Removal of glue, resin or other adhesive layer Removal of oil, grease or other smear Removal of foreign loose particles including soil Presence of rust on metallic surface can degrade appearance as well as functionality.
For polishing and coating removal purposes, glass beads and crashed glass are conventionally used. A nozzle is used to convert this pressure energy into kinetic energy and also to direct the jet towards work surface at a particular angle impingement angle.
When work material arbasive hard and machiming inert such as ceramics like stone, cement, etc.
Abrasive-jet Machining (AJM)
It also enhances MRR. Different Types of Welding Defects. Smooth surface finish can be obtained. Another disadvantage is that the process abrasuve a tapered cut. Jain Allied Publishers Private Limited.
Applications of Abrasive Jet Machining (AJM) Process
Typical frosted glass, it reduces transparency. Benedict Manufacturing Engineering and Materials Processing Process of removal of burrs from machined surface is known as deburring.
jachining Abrasive Jet Machining cannot be used to machine soft materials. Upon impact, hard abrasive particles gradually remove material by erosion and sometime assisted by brittle fracture. Advantages of abrasive jet machining Suitable for removal of deposits on surface Wide range of surface finish can be obtained Process is independent of electrical or thermal properties Mqchining thermal damage of workpiece Suitable for nonconductive brittle materials Low capital investment Disadvantages of abrasive jet machining Not suitable for soft and machinnig 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.
Carrier gas for abrasive jet machining Basic purpose of carrier gas in abrasive jet machining is to accelerate fine abrasive particles by macchining transfer. When gas is compressed to high pressure, steam may condense and tiny water particles can create a larger globule after agglomerating with abrasives.
Solar Collectors Solar energy solid mechanics Thermodynamics units wave energy. Higher gas pressure reduces jet spreading and thus helps in cutting deeper slots accurately.
Equipment for abrasive jet machining Air compressor: Retrieved from ” https: In AJM, why abrasive particles cannot be maxhining Normallly inaccessible portion can be machined with good accuracy. Hard and brittle material preferred. The following are some of the operations that can be performed using Abrasive Jet Machining: I am a mechanical engineer with a passion for technical stuff.
As a consequent, machining deeper slots or hole becomes difficult; instead a wider area is cut. Important process parameters include i abrasive particles—its shape, size, strength, material and flow rate; ii carrier gas—its nature, composition, flow rate, pressure and temperature; iii abrasive jet—mixing ratio, striking velocity, impingement angle and stand-off distance; iv nozzle—its profile and inner diameter; and v work material—its akm properties and stress concentration.
Get Fresh Content from Mechteacher. Process capability of abrasive jet machining Materials: Difference between AJM and sand blasting. Common uses include cutting heat-sensitive, brittle, thin, or hard materials. Ejt —As an alternative to laser beam machining, abrasive jet machining can also be applied sbrasive incising purposes irrespective of chemical and electrical properties of work material.
It controls the abrasive powder feed rate in the mixing chamber. This article explains the construction and working of AJM listing its advantages, disadvantages and applications. What is the basic mechanism of material removal in AJM? Jain Allied Publishers Private Limited.
There are many factors that can influence abrasive jet machining machinig. It consists of gas supply system compressorfilter, pressure regulator, mixing chamber, nozzle assembly and the work holding device.