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在对模具进行电脉冲加工时要注意什么

来源:    发布时间:2019-05-13 13:52:47    点击:

  在模具进行电脉冲加工的时候,我们要常常要注意脉冲间隔和放电时间,这非常重要。
  It is very important to pay attention to the pulse interval and discharge time when the dies are processed by electric pulse.
  在电脉注塑开模加工时候,我们通常把脉冲宽度我们简称脉宽,它是加到工具和工件上放电间隙两端的电压脉冲的持续时间。为了防止电弧烧伤,电火花加工只能用不停的用断断续续的脉冲电压波来加工。粗加工可用较大的脉宽来进行加工,在精加工的时候只能用较少的脉宽来仔细加工。
  Pulse width, which is the duration of voltage pulse applied to both ends of discharge gap on tools and workpieces, is usually referred to as pulse width in open-die processing of pulse injection moulding. In order to prevent arc burns, EDM can only be processed by intermittent pulse voltage waves. Rough processing can be carried out with a larger pulse width, while fine processing can only be done with a smaller pulse width.
  电火花加工
  EDM
  脉冲间隔又简称为脉间或间隔,也可以称为脉冲停歇时间。它的意思是两个电压脉冲之间的间隔时间。间隔时间过短的话,放电间隙来不及消除电离并恢复绝缘,容易产生电弧放电的现象,并且容易烧伤工具和工件;如果脉间选得过长,则容易降低加工生产率。
  Pulse interval is also referred to as pulse interval or interval. It can also be called pulse pause time. It means the interval between two voltage pulses. If the interval time is too short, the discharge gap can not eliminate ionization and restore insulation. It is easy to produce arc discharge and burn tools and workpieces. If the interval time is too long, it is easy to reduce the processing productivity.
  注塑模具脉冲周期通常指从一个脉冲电压开始到相邻的下一个脉冲电压的两者之间的时间叫做脉冲周期。它等于脉冲宽度和脉冲间隔之和。
  Pulse period of injection mould usually refers to the time between the beginning of one pulse voltage and the next adjacent pulse voltage, which is called pulse period. It is equal to the sum of pulse width and pulse interval.
  放电时间指从介质击穿后间隙通过电流到电流脉冲结束时的电流持续时间叫做放电时间。
  Discharge time refers to the current duration from the gap after dielectric breakdown through to the end of current pulse, which is called discharge time.
                                              山东模具
  停歇时间就是相邻两次放电之间的时间间隔叫做停歇时间。脉冲频率就是单位时间内电源产生的电压脉冲的个数叫做脉冲频率。峰值电流就是峰值电流是间隙火花放电时脉冲电流的比较大值(瞬时),它对表面粗糙度、加工效率等有较大的影响。
  The pause time is the time interval between two adjacent discharges called the pause time. Pulse frequency is the number of voltage pulses generated by the power supply in a unit time, which is called pulse frequency. Peak current is the maximum value (instantaneous) of pulse current in gap spark discharge, which has a great influence on surface roughness and processing efficiency.
  在我们对模具进行电火花加工的时候,无论是正极还是负极,都会受到不同程度的电极腐蚀,即使相同材料两电极的被腐蚀量也是不同的,我们会发现其中一个电极比另一个电极的蚀除量大,这种现象通常会叫做极性效应。如果这二个电极材料不同的话,则处于极性的效应会更加明显,通常把工件接脉冲电源正极的加工称为“正极性”加工;反之在工件接脉冲电源负极的加工称为“负极性”加工。在实践中充分利用极性效应,可以提高加工速度,降低工具的电极损耗。
  When we process dies by EDM, both positive and negative electrodes will be corroded to different degrees. Even if the two electrodes of the same material are corroded differently, we will find that one of the electrodes is more corroded than the other. This phenomenon is usually called polarity effect. If the two electrode materials are different, the effect of polarity will be more obvious. Generally, the process of connecting the workpiece to the positive pole of the pulse power supply is called "positive polarity" processing; conversely, the process of connecting the workpiece to the negative pole of the pulse power supply is called "negative polarity" processing. Making full use of polarity effect in practice can improve processing speed and reduce tool electrode loss.
  电火花加工
  EDM
  在电脉冲加工的时候,我们把油类介质中放电加工会分解出负极性的游离碳微粒,在合适的脉宽、脉间条件下将在放电的正极上覆盖碳微粒,叫覆盖效应。同时利用一定的覆盖效应可以降低电极损耗,但工具电极必须接正极,工件接在负极上,即采用负极性加工方式来加工工件。
  In the process of electric pulse processing, we decompose the free carbon particles with negative polarity in the oil medium. Under the suitable pulse width and pulse-to-pulse conditions, the carbon particles will be covered on the positive electrode of the discharge, which is called the covering effect. At the same time, the electrode wear can be reduced by using a certain covering effect, but the tool electrode must be connected with the positive electrode, and the workpiece is connected with the negative electrode, that is, the workpiece is processed by the negative polarity processing method.
  注塑加工脉冲放电释放的能量主要被工具电极、加工工件吸收,通常以融化或者汽化的形式腐蚀掉。很明显在工具电极或被加工金属的熔点、沸点、导热系数、熔化潜热、汽化潜热等越高,电蚀量将越来越少,对工具电极而言就是损耗小、容易保证加工精度;而对加工工件而言就是加工速度慢、效果差。
  The energy released by pulsed discharge in injection moulding is mainly absorbed by tool electrodes and workpieces, and is usually corroded by melting or vaporization. It is obvious that the higher the melting point, boiling point, thermal conductivity, melting latent heat and vaporization latent heat of tool electrode or processed metal, the less the erosion amount will be. For tool electrode, it is easy to guarantee the processing accuracy; for processing workpiece, it is slow and ineffective.
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