Jobs
Deburring
There are many deburring processes, but the most common are mass-finishing, spindle finishing, media blasting, sanding, grinding, wire brushing, abrasive flow machining, electrochemical deburring, electropolishing, thermal energy method, machining, water jet deburring, and manual deburring.[5]
Manual
Manual deburring is the most common deburring process because it is the most flexible process. It also only requires low cost tools and allows for instant inspection.[6] Manual deburring is either done with tools like scrapers, files, sandpaper, stones and reamers or with handheld power tools that use abrasive points, sandpaper, or cutters similar to those used to deburr during machining.
Electrochemical
Electrochemical deburring is the use of electrochemical machining to deburr precision work pieces and edges that are hard-to-reach, such as intersecting holes. The process uses a salt or glycol solution and electricity to dissolve the burr. The electric current is applied with a specialized tool to reach the burr location. Burrs are removed in 5 to 10 seconds, while the rest of the work piece is unaffected.[6]
Thermal
Thermal energy method (TEM), also known as thermal deburring, is a deburring process used to remove hard-to-reach burrs or burrs from multiple surfaces at the same time. The process uses an explosive gas mixture to provide thermal energy to burn off the burrs. It is the fastest burr removal process, requiring only 20 milliseconds to remove a burr.[7]
The process starts by loading the workpiece into an explosion-proof chamber, which is then sealed and clamped with approximately 220 metric tons (240 short tons). The chamber is then evacuated of air and filled with an oxygen and fuel mix; this mixture is pressurized to 0.5 to 1.9 MPa (73 to 276 psi). An electrical igniter then ignites the mixture, which burns for approximately 20 milliseconds, causing all of the sharp corners and burrs to burn away. The peak temperature reaches 3,000 °C (5,430 °F).[7]
Shropshire (/ˈʃrɒpʃər, -ʃɪər/; historically Salop[3] and abbreviated Shrops) is a landlocked ceremonial county in the West Midlands of England. It borders Cheshire to the north, Staffordshire to the east, Worcestershire to the south-east, Herefordshire to the south, and the Welsh counties of Wrexham and Powys to the west. The largest settlement is Telford, and Shrewsbury is the county town.
The county has an area of 3,487 square kilometres (1,346 sq mi) and a population of 498,073. Telford (155,570), in the east of the county, and Shrewsbury (76,782), in the centre, are the only large towns. Shropshire is otherwise rural and characterised by market towns such as Oswestry (15,613), Bridgnorth (12,212), and Newport (11,387). The county contains two districts, Shropshire and Telford and Wrekin, which are both unitary areas.
Shropshire is generally flat in the north and hilly in the south, where the Shropshire Hills AONB covers about a quarter of the county, including The Wrekin, Clee Hills, Stiperstones, Long Mynd, and Wenlock Edge.[4][5] Part of the Fenn's, Whixall and Bettisfield Mosses National Nature Reserve, which extends into Wales, occupies the low-lying north west of the county.[6] The River Severn, Great Britain's longest river, runs through the county in a wide, flat valley before exiting into Worcestershire south of Bridgnorth. The village of Edgmond, near Newport, is the location of the lowest recorded temperature (in terms of weather) in England and Wales.[7]
There is evidence of Neolithic and Bronze Age human occupation in Shropshire, including the Shropshire bulla pendant. The hillfort at Old Oswestry dates from the Iron Age, and the remains of the city of Viroconium Cornoviorum date from the Roman period.[8][9] During the Anglo-Saxon era the area was part of Mercia. During the High Middle Ages the county was part of the Welsh Marches, the border region between Wales and England; from 1472 to 1689 Ludlow was the seat of the Council of Wales and the Marches, which administered justice in Wales and Herefordshire, Shropshire, Worcestershire and Gloucestershire.[10] During the English Civil War Shropshire was Royalist, and Charles II fled through the county — famously hiding in an oak tree — after his final defeat at the Battle of Worcester.[11] The area around Coalbrookdale is regarded as one of the birthplaces of the Industrial Revolution and has been designated a UNESCO World Heritage Site.[12][13]
