弄污
发表于 2025-3-28 17:58:46
Heating Methods,. The blacksmith had limited tools with which to form his horseshoes and carry out repairs to farm equipment. He had to use the strength of his own wrists and shoulders. The fuel used was always coal, specially selected for size and quality.
gospel
发表于 2025-3-28 19:24:33
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清楚说话
发表于 2025-3-29 00:12:35
Spinning and Flow Turning,ith domestic utensils in copper, bronze and pewter. Many cup trophies are fashioned by the craft. Today it is widely used in all branches of the engineering industry: aircraft, communications, transport and chemical to name a few.
pacific
发表于 2025-3-29 03:41:49
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小样他闲聊
发表于 2025-3-29 07:42:07
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让你明白
发表于 2025-3-29 12:12:01
Tool Design,ducts of reputable tool suppliers. These have been developed after many years of research into the requirements of the metal-cutting industries and in most cases have been approved by national or even international standardisation committees.
lethal
发表于 2025-3-29 16:40:20
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JAUNT
发表于 2025-3-29 22:59:55
Powder Metallurgy,The production of parts by powder metallurgy now represents a sizeable industry, with the UK producing some 8000 tons a year and the USA 90000 tons. One of the principal users is the automotive industry and a typical UK motor car will have some 8 lb of sintered components in it compared with 2 lb only a few years ago.
FAR
发表于 2025-3-30 00:58:50
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变色龙
发表于 2025-3-30 07:27:44
Tool Material,Although the history of cutting tool materials dates back to the time when primitive man discovered that some natural substances, . shells and stones, were sufficiently hard to be used to fashion other softer materials, the modern concept of cutting tools begins around the late 19th century with the invention of high speed steel (HSS).