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怎么减少模具加工缺陷呢?

来源:http://www.ok9868.com     发布时间:2020-05-25 11:56:17    点击:

  为了进步模具的运用功能,许多厂商都会对其模具进行恰当加工,模具加工指的是成型和制坯工具的加工,此外还包括剪切模和模切模具,但是在许多情况下,模具加工完也会体现出加工的缺陷,导致模具功能下降,那怎么减少模具加工缺陷呢?其以下七大办法可减少模具加工缺陷就,接下来由山东模具的小编给大家分享一下。
  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、合理挑选和修整砂轮,选用白刚玉的砂轮较好,它的功能硬而脆,且易发生新的切削刃,因此切削力小,磨削热较小,在粒度上运用中等粒度,如46~60目较好,在砂轮硬度上选用中软和软(ZR1、ZR2和R1、R2),即粗粒度、低硬度的砂轮,自励性好可下降切削热。
  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.
  精磨时挑选恰当的砂轮十分重要,针对模具钢材的高钒高钼情况,选用GD单晶刚玉砂轮比较适合,当加工硬质合金、淬火硬度高的材料时,优先选用有机粘结剂的金刚石砂轮,有机粘结剂砂轮自磨性好,磨出的工件粗糙度可达Ra0.2μm,近年来,跟着新材料的应用,CBN(立方氮化硼)砂轮显示出十分好的加工效果,在数控成型磨床、坐标磨床、CNC内外圆磨床上精加工,效果优于其它种类砂轮。
  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,要注意及时修整砂轮,坚持砂轮的锋利,当砂轮钝化后,会在工件外表滑擦、挤压,造成工件外表烧伤,强度下降。
  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、合理运用冷却光滑液,发挥冷却、洗刷、光滑的三大效果,坚持冷却光滑清洁,然后操控磨削热在答应范围内,以防止工件热变形。改进磨削时的冷却条件,如选用浸油砂轮或内冷却砂轮等办法。将切削液引进砂轮的,切削液可直接进入磨削区,发挥有效的冷却效果,防止工件外表烧伤。
  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、将热处理后的淬火应力下降到低限度,由于淬火应力、网状碳化安排在磨削力的效果下,安排发生相变容易使工件发生裂纹。关于高精度模具为了消除磨削的剩余应力,在磨削后应进行低温时效处理以进步韧性。
  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、消除磨削应力也可将模具在260~315℃盐浴中浸1.5 min,然后在30℃油中冷却,这样硬度可下降1HRC,残留应力下降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、关于尺寸公役在0.01 mm以内的精密模具的精密磨削要注意环境温度的影响,要求恒温磨削。由核算可知,300mm长的钢件,温差3℃时,材料有10.8μm左右的改变,(10.8=1.2×3×3,每100mm变形量1.2μm/℃),各精加工工序都需充分考虑这一要素的影响。
  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、选用电解磨削加工,改进模具制作精度和外表质量。电解磨削时,砂轮刮除氧化膜:而不是磨削金属,因此磨削力小,磨削热也小,不会发生磨削毛刺、裂纹、烧伤等现象,一般外表粗糙度可优于Ra0.16μm;另外,砂轮的磨损置小,如磨削硬质合金,碳化硅砂轮磨损量大约为磨削掉的硬质合金分量的400%~600%,用电解磨削时,砂轮的磨损量只要硬质合金磨除量的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、合理挑选磨削用量,选用径向进给量较小的精磨方法甚至精密磨削。如恰当减少径向进给量及砂轮速度、增大轴向进给量,使砂轮与工件接触面积减少,散热条件得到改进,然后有效地操控表层温度的进步。
  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.
  以上就是减少模具加工缺陷的的全部内容了,由山东模具友情奉献,如果您还有其他问题,欢迎咨询山东模具官网http://www.ok9868.com
  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.ok9868.com !
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