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    • 金刚石工具行业里磨削与切削有什么区别?
    • 本站编辑:莱州市试验机金刚石工具厂发布日期:2019-08-28 20:52 浏览次数:


     金刚石工具行业里磨削与切削有什么区别?

      磨削是用磨料切除材料的切削加工方法。由于是用金刚石砂轮等金刚石磨具作切削工具,与通常的切削加工相比,磨削加工还具有一些显著的特点。

      1、切削刃不规则

      磨粒的形状多呈八面体,其大小,形状各异,在砂轮上为不规的随机分布。刚玉砂轮修整后,磨粒常在很大的负前角的条件下切削,顶尖角的刃口钝圆半径也较大。磨粒经精细修整后,将产生一些微小的切削刃,称为微刃。

      2、切削厚度薄

      切削厚度一般只有几微米,因此磨削加工可获得较高的精度和较小的粗糙度。又因磨粒有一定的刃口钝圆半径,故切除单位体积材料所消耗的能量(称磨削比能)大,约为铣削的10倍以上。

      3、磨削速度高

      金刚石砂轮的磨削速度可达60m/s,约为普通刀具切削的10倍以上。

      目前磨削速度可发展到120m/s,可获得较高的金属切除率。

      4、磨削温度高

      金刚石砂轮的磨削速度高,磨粒与工件接触时间短,并产生强烈的摩擦与急剧的塑性变形,金刚石砂轮与工件接触区的平均温度一般为500-800℃,磨粒磨削点温度可高达1000℃,且80%以上的热将传入工件,因此,加工表面容易出现热损伤。

      由上可见,在砂轮在磨削加工中对磨削特点及其带来的种种影响,是必须充分重视、适当运用和合理应对的。

    What is the difference between grinding and cutting in diamond tool industry?

    Grinding is the cutting method of cutting materials with abrasive. As diamond abrasive tools such as diamond grinding wheel are used as cutting tools, the grinding process has some remarkable characteristics compared with the common cutting process.

    1. Irregular cutting edge

    The shapes of abrasive grains are mostly octahedral, with different sizes and shapes, which are randomly distributed on the grinding wheel. After dressing the corundum wheel, the grinding grains are often cut under the condition of a large negative front Angle, and the edge edge of the top Angle has a large blunt circle radius. When the abrasive particles are finely trimmed, some tiny cutting edges are produced, which are called micro edges.

    2, the cutting thickness is thin

    The cutting thickness is usually only a few microns, so the grinding can get higher accuracy and less roughness. Because the abrasive particle has a certain edge blunt radius, the energy consumed by cutting the material per unit volume (called specific grinding energy) is larger, which is about 10 times more than that of milling.

    3. High grinding speed

    The grinding speed of diamond grinding wheel can reach 60m/s, which is more than 10 times of the cutting speed of ordinary tool.

    At present, the grinding speed can be developed to 120m/s, and high metal removal rate can be obtained.

    4. High grinding temperature

    The diamond grinding wheel has a high grinding speed, short contact time between the grinding particle and the workpiece, and produces strong friction and sharp plastic deformation. The average temperature of the contact area between the diamond grinding wheel and the workpiece is generally 500-800℃, and the grinding point temperature of the grinding particle can be as high as 1000℃, and more than 80% of the heat will be transferred to the workpiece. Therefore, the processed surface is prone to thermal damage.

    As can be seen from above, it is necessary to pay full attention to, properly apply and reasonably deal with the grinding characteristics and various influences brought by the grinding wheel in the grinding process.