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怎么減少模具加工缺陷呢?

來源:http://www.gvyuft.buzz     發布時間:2020-05-25 11:56:17    點擊:

  為了進步模具的運用功能,許多廠商都會對其模具進行恰當加工,模具加工指的是成型和制坯工具的加工,此外還包括剪切模和模切模具,但是在許多情況下,模具加工完也會體現出加工的缺陷,導致模具功能下降,那怎么減少模具加工缺陷呢?其以下七大辦法可減少模具加工缺陷就,接下來由山東模具的小編給大家分享一下。
  In order to improve the application function of the mold, many manufacturers will process the mold properly. Mold processing refers to the processing of the forming and blank making tools, in addition to the cutting mold and die-cutting mold. But in many cases, the mold processing will also reflect the processing defects, resulting in the decline of the mold function, so how to build the mold processing defects? The following seven methods can be used to build mold processing defects, next by Shandong mold editor to share with you.
  1、合理挑選和修整砂輪,選用白剛玉的砂輪較好,它的功能硬而脆,且易發生新的切削刃,因此切削力小,磨削熱較小,在粒度上運用中等粒度,如46~60目較好,在砂輪硬度上選用中軟和軟(ZR1、ZR2和R1、R2),即粗粒度、低硬度的砂輪,自勵性好可下降切削熱。
  1. It is better to select and trim the grinding wheel reasonably and select the white corundum grinding wheel. Its function is hard and brittle, and it is easy to produce new cutting edge. Therefore, the cutting force is small, and the grinding heat is small. The use of medium grain size, such as 46-60 mesh, is better. The use of medium soft and soft (ZR1, Zr2 and R1, R2) in the hardness of the grinding wheel, that is, the grinding wheel with coarse grain size and low hardness, with good self excitation, can reduce the cutting heat.
  精磨時挑選恰當的砂輪十分重要,針對模具鋼材的高釩高鉬情況,選用GD單晶剛玉砂輪比較適合,當加工硬質合金、淬火硬度高的材料時,優先選用有機粘結劑的金剛石砂輪,有機粘結劑砂輪自磨性好,磨出的工件粗糙度可達Ra0.2μm,近年來,跟著新材料的應用,CBN(立方氮化硼)砂輪顯示出十分好的加工效果,在數控成型磨床、坐標磨床、CNC內外圓磨床上精加工,效果優于其它種類砂輪。
  It's very important to choose the right grinding wheel for fine grinding. In view of the high vanadium and high molybdenum situation of die steel, it's more suitable to choose GD single crystal corundum grinding wheel. When processing the hard alloy and the material with high quenching hardness, the diamond grinding wheel with organic binder is preferred. The grinding wheel with organic binder has good self grindability and the workpiece roughness can reach Ra0.2 μ M. in recent years, with the application of new materials, CBN The grinding wheel (CBN) shows a very good machining effect. It is better than other kinds of grinding wheels in finishing on CNC forming grinding machine, coordinate grinding machine and CNC Internal and external cylindrical grinding machine.
  在磨削加工中,要注意及時修整砂輪,堅持砂輪的鋒利,當砂輪鈍化后,會在工件外表滑擦、擠壓,造成工件外表燒傷,強度下降。
  In the grinding process, we should pay attention to timely dressing the grinding wheel, adhere to the sharpness of the grinding wheel, when the grinding wheel is passivated, it will rub and squeeze on the surface of the workpiece, resulting in burn on the surface of the workpiece and strength reduction.
  2、合理運用冷卻光滑液,發揮冷卻、洗刷、光滑的三大效果,堅持冷卻光滑清潔,然后操控磨削熱在答應范圍內,以防止工件熱變形。改進磨削時的冷卻條件,如選用浸油砂輪或內冷卻砂輪等辦法。將切削液引進砂輪的,切削液可直接進入磨削區,發揮有效的冷卻效果,防止工件外表燒傷。
  2. Reasonably use the cooling smooth liquid, give play to the three effects of cooling, washing and smoothing, adhere to the cooling smooth cleaning, and then control the grinding heat within the allowable range to prevent the workpiece from thermal deformation. Improve the cooling conditions during grinding, such as selecting the immersion grinding wheel or internal cooling grinding wheel. When the cutting fluid is introduced into the center of the grinding wheel, the cutting fluid can directly enter the grinding area to play an effective cooling effect and prevent the surface of the workpiece from burning.
  3、將熱處理后的淬火應力下降到低限度,由于淬火應力、網狀碳化安排在磨削力的效果下,安排發生相變容易使工件發生裂紋。關于高精度模具為了消除磨削的剩余應力,在磨削后應進行低溫時效處理以進步韌性。
  3. The quenching stress after heat treatment is reduced to a low level. Because the quenching stress and network carbonization are arranged under the effect of grinding force, the phase transformation is arranged to make the workpiece crack easily. In order to eliminate the residual stress in grinding, the high-precision die should be aged at low temperature to improve its toughness.
  4、消除磨削應力也可將模具在260~315℃鹽浴中浸1.5 min,然后在30℃油中冷卻,這樣硬度可下降1HRC,殘留應力下降40%~65%。
  4. The mould can also be immersed in 260-315 ℃ salt bath for 1.5 min to eliminate grinding stress, and then cooled in 30 ℃ oil, so the hardness can be reduced by 1 HRC, and the residual stress can be reduced by 40% - 65%.
  5、關于尺寸公役在0.01 mm以內的精密模具的精密磨削要注意環境溫度的影響,要求恒溫磨削。由核算可知,300mm長的鋼件,溫差3℃時,材料有10.8μm左右的改變,(10.8=1.2×3×3,每100mm變形量1.2μm/℃),各精加工工序都需充分考慮這一要素的影響。
  5. For the precision grinding of precision die with dimension less than 0.01 mm, it is necessary to pay attention to the influence of environment temperature and require constant temperature grinding. It can be seen from the calculation that when the temperature difference of 300 m m long steel parts is 3 ℃, the material changes about 10.8 μ m, (10.8 = 1.2 × 3 × 3, 1.2 μ M / ℃ for every 100 mm deformation). The influence of this factor should be fully considered in each finishing process.
  6、選用電解磨削加工,改進模具制作精度和外表質量。電解磨削時,砂輪刮除氧化膜:而不是磨削金屬,因此磨削力小,磨削熱也小,不會發生磨削毛刺、裂紋、燒傷等現象,一般外表粗糙度可優于Ra0.16μm;另外,砂輪的磨損置小,如磨削硬質合金,碳化硅砂輪磨損量大約為磨削掉的硬質合金分量的400%~600%,用電解磨削時,砂輪的磨損量只要硬質合金磨除量的50%~100%。
  6. Electrolytic grinding is selected to improve the accuracy of mold making and appearance quality. In electrolytic grinding, the grinding wheel scrapes off the oxide film instead of grinding the metal, so the grinding force is small, the grinding heat is small, and there will be no grinding burr, crack, burn and other phenomena. Generally, the surface roughness can be better than ra0.16 μ m; in addition, the wear of the grinding wheel is small, such as grinding hard alloy, the wear of silicon carbide wheel is about 400% - 600% of the grinding hard alloy component, When electrolytic grinding is used, the wear amount of grinding wheel is only 50% - 100% of that of cemented carbide.
  7、合理挑選磨削用量,選用徑向進給量較小的精磨方法甚至精密磨削。如恰當減少徑向進給量及砂輪速度、增大軸向進給量,使砂輪與工件接觸面積減少,散熱條件得到改進,然后有效地操控表層溫度的進步。
  7. Reasonable selection of grinding amount, selection of radial feed smaller precision grinding method or even precision grinding. If the radial feed rate and the grinding wheel speed are properly reduced and the axial feed rate is increased, the contact area between the grinding wheel and the workpiece is reduced, the heat dissipation condition is improved, and then the surface temperature is effectively controlled.
  以上就是減少模具加工缺陷的的全部內容了,由山東模具友情奉獻,如果您還有其他問題,歡迎咨詢山東模具官網http://www.gvyuft.buzz
  The above is the whole content of reducing mold processing defects. Shandong mold is dedicated. If you have other questions, please consult Shandong mold official website http://www.gvyuft.buzz !
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