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数控丝锥的的软硬度是如何把控的?

发布时间:2021-04-01 10:58:38 来源:http://www.jnskdj.com 作者:骏豪 浏览量:

揉捏进口丝锥彻底是靠无屑揉捏出的螺纹孔,与切削进口丝锥比较,用冷揉捏成形进口丝锥加工软质资料(≤HRC35)螺纹孔具有许多优势。由于冷揉捏成形攻丝是揉捏而不是切削资料,因而揉捏进口丝锥不会发生切屑。与切削而成的螺纹比较,冷揉捏成形的螺纹具有更高的外表拉伸强度、屈从强度和剪切强度。更高的强度来源于螺纹构成机理,该工艺是经过使工件资料发生永久塑性变形而构成螺纹的。

Compared with the imported tap, the cold kneading imported tap has many advantages in processing soft data (≤ HRC35) threaded hole. Because cold kneading forming tapping is kneading rather than cutting data, chip will not occur when kneading imported tap. Compared with the cut thread, the cold kneading thread has higher external tensile strength, bending strength and shear strength. The higher strength comes from the mechanism of thread formation, which is formed by permanent plastic deformation of workpiece data.

冷揉捏成形丝锥的寿数一般比切削丝锥更长,由于冷揉捏成形丝锥没有简单被快速磨损的尖利切削刃。冷揉捏成形丝锥还能以比切削丝锥更大的长径比加工螺纹。此外,与切削丝锥比较,用冷揉捏成形丝锥加工出的螺纹尺度一般具有更好的一致性。

The service life of cold kneading tap is generally longer than that of cutting tap, because cold kneading tap has no sharp cutting edge which is easily and rapidly worn. The cold kneading forming tap can also process thread with larger length diameter ratio than the cutting tap. In addition, compared with the cutting tap, the thread size produced by cold kneading tap generally has better consistency.

数控丝锥的的软硬度是如何把控的?(图1)

可是,要取得这种尺度一致性也需求支付必定价值。在进行冷揉捏成形攻丝时,需求首要加工出更精细的中心孔。冷揉捏成形攻丝的成功取决于中心孔的直径,其尺度公役一般要比用切削丝锥攻丝时更小。孔径尺度一个单位的误差就或许引起构成的螺纹尺度4个单位的误差。因而,在进行冷揉捏成形攻丝之前,或许需求对中心孔进行铰削加工。

However, in order to achieve this scale consistency, we need to pay a certain value. In cold kneading forming tapping, it is necessary to process more precise center hole. The success of cold kneading tapping depends on the diameter of the central hole, which is generally smaller than that of tapping with a cutting tap. The error of one unit of aperture scale may cause the error of four units of thread scale. Therefore, before cold kneading tapping, it may be necessary to ream the center hole.

假如中心孔尺度过大,将没有满足的资料可供冷揉捏成形丝锥揉捏出正确尺度的螺纹。假如中心孔尺度过小,冷揉捏成形丝锥就不得不挤开更多的资料以构成螺纹,然后构成丝锥过快磨损。此外,在加工粗牙螺纹时,为了构成每个螺纹,冷揉捏成形丝锥都有必要挤开更多资料,而揉捏的资料越多,发生冷作硬化的或许性也越大。不锈钢、钛合金和镍基合金都简单发生冷作硬化,因而,这些资料都或许缩短丝锥寿数,或构成丝锥折断。

If the center hole size is too large, there will be no enough data for cold kneading forming tap to knead the correct size of thread. If the center hole ruler is too small, the cold kneading tap will have to squeeze more information to form the thread, and then the tap will wear too fast. In addition, in order to form each thread, it is necessary to squeeze more information when processing coarse thread. The more information kneaded, the more possibility of cold work hardening. Stainless steel, titanium alloy and nickel base alloy are all prone to cold work hardening. Therefore, these data may shorten the life of tap or cause tap fracture.

硬质资料上的螺纹孔还可以用螺纹铣刀来加工。一般来说,用硬质合金螺纹铣刀加工高硬度资料没有太大问题。螺纹铣削可以对刀具的进给率进行更好的操控。此外,螺纹铣削一般是在硬质资料上加工螺纹孔安全的办法,尤其是,一旦螺纹铣刀折断在螺孔中,十分简单采纳抢救办法。而一旦切削丝锥折断在螺孔中,从孔中取出折断的丝锥并抢救一般价值不菲的工件就要困难得多,有时乃至彻底不或许。因而,在模具制造业和航空工业,螺纹铣削一般是在硬质资料上加工螺纹孔的首选方法。

The thread holes on hard data can also be processed by thread milling cutter. Generally speaking, there is no big problem in processing high hardness data with carbide thread milling cutter. Thread milling can better control the tool feed rate. In addition, thread milling is generally a safe way to process thread holes on hard data. Especially, once the thread milling cutter is broken in the thread hole, it is very simple to adopt the rescue method. Once the cutting tap is broken in the screw hole, it is much more difficult to take out the broken tap from the hole and rescue the general valuable workpiece, sometimes even completely impossible. Therefore, in the mold manufacturing industry and aviation industry, thread milling is generally the preferred method for processing threaded holes on hard materials.

此外,在螺纹铣削时,制造商可以更简单地操控螺纹尺度。螺纹铣刀是经过螺旋插补运动(包含CNC数控机床的X、Y和Z轴一起运动)来铣制螺纹的,当螺纹铣刀磨损后,可以终究靠机床编程对刀具的螺旋插补进行补偿,然后确保加工出的螺纹尺度一直契合规范要求。不过,与螺纹攻丝比较,螺纹铣削的加工成本或许更高,在挑选加工工艺时有必要考虑这一点。

In addition, in thread milling, the manufacturer can control the thread size more easily. Thread milling cutter is processed by spiral interpolation (including the movement of X, y and Z axes of CNC machine tool). When the thread milling cutter is worn, the spiral interpolation of the cutter can be compensated by the machine tool programming, and then the dimension of the processed thread can always meet the specification requirements. However, compared with thread tapping, the processing cost of thread milling may be higher, so it is necessary to consider this point when selecting the processing technology.