【正文】 這意謂，當?shù)毒呖拷鼈儠r，較軟的金屬容易有些微小 的變形或凸出，這樣將會與刀具發(fā)生摩擦。太小的間隙角將會導(dǎo)致刀具與工件摩 擦。 切屑切斷器 ,如圖 928 D,導(dǎo)致切屑在角落里被切斷，然后以小的切屑落到切屑盤中。切屑緊密小卷曲形成反對刀把對抗刀具的刀刃的力會使之破斷。在延性的材料上進行深削減的時候，切屑容易在刀具周圍積聚很多，這將對操作人員造成危險。 后角的大小被加工材料的類型，也和刀具固定在刀把上的方式有關(guān)。 圖 926展示刀具以一個 15個度的角固定，但是在這情況下刀具以一個后角和側(cè)傾角的結(jié)合形式接近工件。 二個不同的側(cè)傾角在圖 923A 和 923B中被舉例 。 如果切屑向背面的流出 ,也就是說，向刀把，它被稱為后角。傾角的變化取決于被切割的材料。適當?shù)拈g隙，如圖 920 B ，切削刀具將會切削得好。直角三角形的毗連邊 (b) 與進給 英尺等同。當切削工作將近完成時，金屬的最后斷面被以圈，打包鐵皮或纏結(jié)的金屬球的形式逐漸地移開代替被直接移開 。有明顯的優(yōu)點 , 依下列各項 :好的切削角度 ,使刃口的切削工作進行得比較好，而 且切屑比較薄。 圖 918 舉例說明前面間隙對一個車刀的作用，當它以一個 15度角固定時。如果沒有前面的間隙。如果沒有側(cè)隙角 ,圖 916 A,刀具將會只是與工件摩擦而不是切削。太大的間隙將會引起刃口的振動 (顫動 ) 和可能使刃口的完全崩潰。 間隙的大小取決于被切割材料和被切割的材料變形。 間隙阻止刀具的刃口與工件摩擦。 總之 , 最廣泛使用過的割削刀具材料是高速鋼、低合金材料和硬質(zhì)合金。除了碳化鈦和金鋼石外 ,陶瓷刀具是現(xiàn)在工業(yè)中所有材料中最硬切削刀具，尤其在高的溫度。 陶瓷刀具 ( 或混合氧化物 ) 主要是混合氧化物。硬質(zhì)合金刀具比高速鋼刀具硬，因此用作工具有較好的耐磨性。 硬質(zhì)合金刀 具的進給機構(gòu)比高速鋼刀具或鑄造 合金刀具更輕，因為趨向于用硬質(zhì)合金刀具作為切削工具。硬質(zhì)合金中很少或含鐵。由高速鋼制成的刀具有熱硬性，一些高速鋼中還含有鈷，這也是形成熱硬性的因素。提高了刀具的耐磨性。刀具必然會被再次硬化和再次被回火。用這些鋼做成的切削刀具能在高于他們回火溫度大約華氏 400 度 (攝氏 205度 ) 到華氏 500 度 (攝氏 260 度 )時仍然保持硬度，這要取決于碳的含量的。一個氧化鋁搪磨工具作為碳素工具鋼和高速鋼刀具的工具。太多壓力可能被加到沙輪上。相同量的前面間隙對兩者情況是一樣的。刀具對于一個特別輪廓的螺紋的平面是要被磨成的正確尺寸。特別是加工灰口鑄鐵時更是如此。雖然這種刀具刀尖塊有足夠的強度來進行深削 , 但是較長的切屑會在切斷機的周圍積聚很多后才脫落。但請不要混淆了薄片刀具和帶斷屑器的刀具。不像粗加工 ,精加工的加工速度慢。 * 識別不同形式的間隙和傾角而選擇每種形式的應(yīng)用范圍。 * 列出三種使用最廣泛刀具材料。s edge can still continue to use it. Lowalloy steel cutting tool is relatively small for a modern processing. Highspeed steel with tungsten of 14 percent to 22 percent, or Containing % to 6% of the WMo (molybdenum which accounted for 6 percent to 91 percent). From highspeed steel tool made of a rigid heat, some highspeed steel also contains cobalt, which is formed of rigid factor. Cobalt containing highspeed steel tool can maintain hardness, more than 1,000 degrees Fahrenheit (or 540 degrees Celsius) blade will bee soft and easily damaged. After cooling, the tool will harden. When grinding, you must be careful because of overheating and cold at first, so that profile Benglie Zhucheng a variety of metal alloy materials have a special name called Carbide, such as containing tungsten carbide cobalt chrome. In little or iron carbide. However, its highspeed steel cutting speed than the maximum cutting speed is higher 25 percent to 80 percent. Carbide Tool General for cutting force and the intermittent cutting processing, such as processing Chilled Iron. The past, Carbide Tool is mainly used for processing iron, but now carburizing tool for processing all the metal. Carbide Tool into the body than to the highspeed steel tool or casting lighter alloy cutting tools, because tend to be used as a tool carbide cutting tools. Pure tungsten, carbon carburizing agent or as a dipping formation of the tungsten carbide, suitable for the cast iron, aluminum, noniron alloy, plastic material and fiber of the machining. Add tantalum, titanium, molybdenum led to the carbon steel The hardness of higher tool, this tool suitable for processing all types of steel. In manufacturing, or tungsten steel alloy containing two or more of a bonding agent and the mixture is hard carbon steel tool, is now generally containing cobalt, cobalt was inquiry into powder and thoroughly mixed, under pressure Formation of Carbide. These cutting tools in the temperature is higher than 1,660 degrees F (870 degrees C) can also be efficiently used. Carbide Tool hardware than highspeed steel tool, used as a tool for better wear resistance. Carbide Tool in a highspeed Gangdao nearly three times the maximum cutting speed of the cutting rate cutting. Made from diamonds to the cutting tool on the surface finish and dimensional accuracy of the high demand and carbide cutting tools can be petitive, but these tools processing the material was more difficult, and difficult to control. Metal, hard rubber and plastic substances can be effective tool together with diamonds and annoyance to the final processing. Ceramic tool (or mixed oxide) is mixed oxide. With 030 grade alumina mixture to do, for example, contains about 89 percent to 90 percent of alumina and 10 percent to 11 percent of titanium dioxide. Other ceramic tool is used with the tiny amount of the second oxides Mixed together the cause of pure alumina. Ceramic tools in more than 2,000 degrees F (1095 degrees C) temperature of the work is to maintain strength and hardness. Cutting rates than highcarbon steel knives to 50 percent or even hundreds of percentage. In addition to diamonds and titanium carbide, ceramic tool in the industry is now all the materials of the most hard cutting tool, especially at high temperatures. Tao structure easily broken in a specific situation, broken only carbon intensity of the half to twothirds. Therefore, in cut, according to the proportion of cutting and milling would normally not be remended. Ceramics cutting machine breakdown of failure is not usually wear failure, as pared with other materials, their lack of ductility and lower tensile strength. In short, the most widely used by the cutting tool material is cut highspeed steel, low alloy materials and carbide. Gap and dip Space and inclination of the principle is t