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      • 刀具的磨損的形式有哪些
      • 本站編輯:穆格精密工具(杭州)有限公司發布日期:2019-10-22 20:40 瀏覽次數:

      刀具正常磨損的形式有以下幾種:

      1. 前刀面磨損 2. 后刀面磨損 3. 邊界磨損( 前、后刀面同時磨損)

      從對溫度的依賴程度來看,刀具正常磨損的原因主要是機械磨損和熱、化學磨損。機械磨損是由工件材料中硬質點的刻劃作用引起的,熱、化學磨損則是由粘結(刀具與工件材料接觸到原子間距離時產生的結合現象) 、擴散(刀具與工件兩摩擦面的化學元素互相向對方擴散、腐蝕) 等引起的。

      (1) 磨粒磨損

      在切削過程中,刀具上經常被一些硬質點刻出深淺不一的溝痕。磨粒磨損對高速鋼作用較明顯。

      (2) 粘結磨損

      刀具與工件材料接觸到原子間距離時產生的結合現象, 稱粘結。粘結磨損就是由于接觸面滑動在粘結處產生剪切破壞造成。低、中速切削時,粘結磨損是硬質合金刀具的主要磨損原因。

      (3) 擴散磨損

      切削時在高溫作用下,接觸面間分子活動能量大,造成了合金元素相互擴散置換,使刀具材料機械性能降低,若再經摩擦作用,刀具容易被磨損。擴散磨損是一種化學性質的磨損。

      (4) 相變磨損

      當刀具上比較高溫度超過材料相便溫度時,刀具表面金相組織發生變化。

      (5) 氧化磨損

      氧化磨損是一種化學性質的磨損。


      There are the following types of normal tool wear:
      1. Front blade wear 2. Back knife surface wear 3. Boundary abrasion(both front and rear blade)
      Judging from the degree of dependence on temperature, the normal wear of the tool is mainly due to mechanical wear and thermal and chemical wear. Mechanical wear is caused by the engraving of hard points in the workpiece material. Heat and chemical wear are caused by adhesion(the combination of the tool and the workpiece material when they come into contact with the distance between atoms), diffusion(the chemical elements of the friction surface between the tool and the workpiece spread to each other, corrosion), etc..
      (1) Grinding wear
      In the process of cutting, the tool is often carved by some hard points with different depths of groove. The abrasion effect of abrasive grains on high speed steel is more obvious.
      (2) Adhesive wear
      The binding phenomenon that occurs when the tool and the workpiece material come into contact with the distance between atoms is called bonding. Adhesive wear is caused by the shear failure caused by the sliding of the contact surface at the bond. Glue wear is the main wear cause of cemented carbide tools in low and medium speed cutting.
      (3) Diffusion wear
      During cutting, under the action of high temperature, the molecular activity energy between the contact surfaces is large, resulting in the diffusion and replacement of alloy elements, which reduces the mechanical properties of the tool material. If the tool is subjected to friction, the tool is easily worn. Diffusion wear is a chemical wear.
      (4) Phase change wear
      When the maximum temperature on the tool exceeds the material phase temperature, the metallographic structure of the tool surface changes.
      (5) Oxidation wear
      Oxidation wear is a chemical wear.

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