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在對模具進行電脈沖加工時要注意什么

刮刮乐2000 www.yfrmbf.com.cn 來源:    發布時間:2019-05-13 13:52:47    點擊:

  在模具進行電脈沖加工的時候,我們要常常要注意脈沖間隔和放電時間,這非常重要。
  It is very important to pay attention to the pulse interval and discharge time when the dies are processed by electric pulse.
  在電脈注塑開模加工時候,我們通常把脈沖寬度我們簡稱脈寬,它是加到工具和工件上放電間隙兩端的電壓脈沖的持續時間。為了防止電弧燒傷,電火花加工只能用不停的用斷斷續續的脈沖電壓波來加工。粗加工可用較大的脈寬來進行加工,在精加工的時候只能用較少的脈寬來仔細加工。
  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.
  電火花加工
  EDM
  脈沖間隔又簡稱為脈間或間隔,也可以稱為脈沖停歇時間。它的意思是兩個電壓脈沖之間的間隔時間。間隔時間過短的話,放電間隙來不及消除電離并恢復絕緣,容易產生電弧放電的現象,并且容易燒傷工具和工件;如果脈間選得過長,則容易降低加工生產率。
  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.
  注塑模具脈沖周期通常指從一個脈沖電壓開始到相鄰的下一個脈沖電壓的兩者之間的時間叫做脈沖周期。它等于脈沖寬度和脈沖間隔之和。
  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.
  放電時間指從介質擊穿后間隙通過電流到電流脈沖結束時的電流持續時間叫做放電時間。
  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.
                                              山東模具
  停歇時間就是相鄰兩次放電之間的時間間隔叫做停歇時間。脈沖頻率就是單位時間內電源產生的電壓脈沖的個數叫做脈沖頻率。峰值電流就是峰值電流是間隙火花放電時脈沖電流的比較大值(瞬時),它對表面粗糙度、加工效率等有較大的影響。
  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.
  在我們對模具進行電火花加工的時候,無論是正極還是負極,都會受到不同程度的電極腐蝕,即使相同材料兩電極的被腐蝕量也是不同的,我們會發現其中一個電極比另一個電極的蝕除量大,這種現象通?;嶠兇黽孕в?。如果這二個電極材料不同的話,則處于極性的效應會更加明顯,通常把工件接脈沖電源正極的加工稱為“正極性”加工;反之在工件接脈沖電源負極的加工稱為“負極性”加工。在實踐中充分利用極性效應,可以提高加工速度,降低工具的電極損耗。
  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.
  電火花加工
  EDM
  在電脈沖加工的時候,我們把油類介質中放電加工會分解出負極性的游離碳微粒,在合適的脈寬、脈間條件下將在放電的正極上覆蓋碳微粒,叫覆蓋效應。同時利用一定的覆蓋效應可以降低電極損耗,但工具電極必須接正極,工件接在負極上,即采用負極性加工方式來加工工件。
  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.
  注塑加工脈沖放電釋放的能量主要被工具電極、加工工件吸收,通常以融化或者汽化的形式腐蝕掉。很明顯在工具電極或被加工金屬的熔點、沸點、導熱系數、熔化潛熱、汽化潛熱等越高,電蝕量將越來越少,對工具電極而言就是損耗小、容易保證加工精度;而對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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