ABRASIVE JET MACHINING AJM PDF

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.

Author: Moogusho Faugami
Country: Luxembourg
Language: English (Spanish)
Genre: History
Published (Last): 14 August 2010
Pages: 142
PDF File Size: 18.27 Mb
ePub File Size: 18.9 Mb
ISBN: 829-1-50490-424-8
Downloads: 40396
Price: Free* [*Free Regsitration Required]
Uploader: Tasar

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

The lodged out or wear particle is carried away by the air or gas. Surface of the workpiece is cleaned automatically. Why different abrasives produce different MRR? Mishra Narosa Publishing House. Controlled abrasive jet machining can be utilized for removing flash known as deflashing to get desired clean product with higher dimensional accuracy and tolerance as well as sumptuous appearance.

Abrasive Jet Machining – Process, Parameters, Equipment, MRR

A compressor is used to elevate pressure of the carrier gas as high as 20bar ; abrasive grits are mixed with it in a mixing chamber as per mixing ratioand a nozzle is used to convert pressure energy into kinetic energy in the form of high velocity jet. Material removal rate and its estimation Knowledge of jam removal rate Aim is beneficial for selecting process parameters and choosing feed rate of the nozzle.

Common applications of abrasive jet machining process are provided below. However, pure oxygen is not used as it can quickly oxidize the work surface. Cutting and drilling holes Apart from above main applications of AJM, it can also be utilized for cutting various shapes as well as for drilling holes. Mass flow rate of abrasive is usually controlled by Mixing Ratio, whose effects are also discussed later in this section.

The distance of the nozzle from the workpiece affects the size of the abbrasive area and the rate of material removal. Types of patterns used in Casting Process. Effects of carrier gas on abrasive jet 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.

  LEKTIRA ROBINZON KRUSO PDF

Mixing ratio can be increased by increasing abrasive percentage and in such case an increasing abrssive in MRR can be noticed because larger number of abrasives participates in micro-cutting action per unit time. This jet is used to remove unwanted material from the abrawive. 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.

A properly designed casting, a properly prepared mould and correctly malted metal should result in a defect free casting. Specifically it is used to cut intricate shapes or form specific edge shapes. Representative image Engraving ahm the process of incising pattern, letter, art or design on a solid surface for decorative or artistic or formal purposes.

Abrasive jet machining is best suited for machining brittle and heat machininy materials like glass, quartz, sapphire, ceramics etc, It is used jey drilling holes, cutting slots, cleaning hard surfaces, deburring, polishing etc.

Chamber is vibrated to obtain homogeneous mixing. Category List Automobile Engineering Biomass Boiling heat transfer energy energy sources engineering materials. Material is removed by fine abrasive particles, usually about 0.

The tapering of hole especially, when the depth of the hole is more, becomes almost inevitable. Even the pans and Macjining conventional machining operation is carried out, some unwanted tiny metal parts remain attached to the edges after the completion of operation, which are known as burr. It basically determines concentration of abrasives in the jet. Distance from the work surface to the tip of nozzle in abrasive jet machining set-up is called Stand-Off Distance, abbreviated as SOD.

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.

Here momentum transfer takes place and abrasives start flowing with carrier gas. Basic purpose of carrier gas in abrasive jet machining is to accelerate fine abrasive particles by momentum transfer.

Applications of Abrasive Jet Machining (AJM) Process

Alternatively smaller SOD can cut a deeper but narrow slot or hole. However, excessive concentration of abrasive in the jet can significantly reduce MRR because of lower jet velocity as gas pressure is constant and unavoidable collision thus loss of kinetic energy.

  ARQUITECTURA ANSI SPARC PDF

Non-corrosive abrading of ceramic materials can be carried out by abrasive jet machining AJM. Advantages of abrasive jet machining Suitable for removal of deposits on surface Wide range of surface amm 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.

It is also one application of abrasive jet abraeive.

Abrasive jet machining – Wikipedia

Views Read Edit View history. Advanced Machining Processes by V. Knowledge of material removal rate MRR is beneficial for selecting process parameters and choosing feed rate of the nozzle. AJM should be avoided if work material is soft and ductile; otherwise quality of machined surface will be poor. Nontraditional Manufacturing Processes by G. 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 velocity gas to erode material from the workpiece.

Among the desired properties sufficient hardness, irregular shape, presence of sharp edges and good flow characteristics are essential. Subscribe in a reader.

Mild steel is the most commonly used steel. Indefinite increase in MRR is not practically feasible because of limited capability of equipment and accessories. Also a good appearance may not be obtained if engraving is carried out by AJM. The process can be easily controlled to vary the metal removal rate which depends on flow rate and size abarsive abrasive particles.

Effects of abrasives on abrasive jet machining performance. The abrasive jet is obtained by accelerating fine abrasive particles in highly pressurized gas carrier gas. The following factors affect the choice of a pattern. These valves controls volume flow rate of carrier gas in order to maintain constant mixing ratio.