Home

Class Schedule

µÚ·Î ¸ñÂ÷·Î
3 Æí     ¼Ò  ¼º   °¡   °ø


°üÀçÀιß(ηî§ìÚÚû; tube Ddawing)

¾ÐÃâ, õ°ø ¹× ¾Ð¿¬ µîÀÇ ¿­°£°¡°ø¿¡¼­ ¸¸µé¾îÁø cylinder ¶Ç´Â tubeÀÇ ¹ÝÁ¦Ç°À» Àι߿¡ ÀÇÇÏ¿© ³Ã°£°¡°øÇÔÀ¸·Î½á Ä¡¼ö¸¦ Á¶Á¤ÇÏ°í ±â°èÀû ¼ºÁú°ú Ç¥¸éÁ¤¹Ðµµ¸¦ Çâ»ó½ÃÅ°´Â °æ¿ì°¡ ÀÖ´Ù.
°üÀι߹ý(tube drawing process)Àº ±âº»ÀûÀ¸·Î´Â ¼±Àι߹ý(wire drawing process)°ú °°À¸³ª °üÀº ÀÎ¹ß drum¿¡ °¨À» ¼ö ¾ø±â ¶§¹®¿¡ drawnench¿¡ ÀÇÇÏ¿© ÀιßÇϸç, °üÀÇ ³»°æ, ¿Ü°æ ¹× º®ÀÇ µÎ²²¸¦ Á¶Á¤Çϱâ À§ÇÏ¿© ´ÙÀ½°ú °°Àº ½ÉºÀ(ãýÜê; mandrel), rod ¹× punch¸¦ »ç¿ëÇÑ´Ù.

Seamless tubes are produced from blanks made by piercing or boring billets or by extrusion. The blanks are reduced in section and elongated either by passing through rolls with semicircular grooves or passes cut into them or by drawing them through dies. Drawing is most frequently used because it produces a good surface finish and close dimensional control, coupled with improved mechanical properties due to cold working.
Tube drawing is a reduction process in which one end of a tube is grasped and pulled through a die that is smaller than the tube diameter. To obtain the desired size, a series of successive reductions, or passes, may be necessary. Because of its versatility, tube drawing is suited for both small and large production runs.

Process Characteristics

cylindrical mandrelÀ» ÀÏÁ¤ À§Ä¡¿¡ ³õ°í °üÀ» ÀϹßÇÑ´Ù.
Fixed, or stationary, plug drawing is the oldest method for plug drawing stainless steels. One application is for producing smooth ID surfaces in short, straight lengths. While the operation is slow and area reductions are limited, no other drawing process has the capability of producing comparable ID surfaces.

tapered mandrelÀ» ÀÏÁ¤ À§Ä¡¿¡ ³õ°í °üÀ» ÀιßÇÑ´Ù
.

cylindrical rod¿Í °üÀ» ÇÔ²² Àâ¾Æ ´ç±â¸é¼­ ÀιßÇÑ´Ù.
The rod drawing process draws the tube over a hardened steel rod, or mandrel, that passes through the die with the tube.
The typical die angle for rod drawing is 36 degrees; the bearing length is short. This process reduces the OD, ID, and wall thickness. A secondary operation called reeling expands the diameter slightly so the rod can be extracted. For this reason, rod drawing rarely is used as a final operation.
The differences among tube drawing methods include the presence or absence of a rod or plug, whether and how the plug is fixed in position, and the die angle. Rod drawing creates less friction and lower drawing forces than any of the plug drawing operations, so it can enable higher area reductions than the other methods. This advantage is offset in that it is a two-step operation (drawing and reeling), as opposed to the three variations of plug drawing, which are one-step operations.
Tube producers use rod drawing primarily for sizes not suitable for plug drawing, such as heavy-wall or small-ID tubing. Rod drawing requires less setup time, so it is suitable for small runs. Rod drawing is limited in the lengths it can draw, which generally are less than 100 feet.
Superhigh-pressure tubing and heavy-wall hydraulic tubing usually are produced by rod drawing followed by a sinking operation to produce the finished dimensions.

cylindrical punch·Î deep drawingµÈ shellÀ» ¹Ð¾î ³¿À¸·Î½á ÀιßÇÑ´Ù. ¹Ð¾î³»±â ¶§¹®¿¡ ¾ÐÃâ·Îµµ º¼ ¼ö ÀÖÀ¸³ª die¸¦ ÅëÇÏ¿© ³ª¿À´Â °üÀÌ ÀÎÀåÀÀ·ÂÀ» ¹Þ´Â´Ù´Â °üÁ¡¿¡¼­ ÀιßÀ̶ó ÇÒ ¼ö ÀÖ´Ù.

ÁöÁöºÎ°¡ ¾ø´Â floating plug¸¦ »ç¿ëÇÏ¿© °üÀÇ ³»°æ°ú ¿Ü°æÀ» µ¿½Ã¿¡ Á¶Á¤ÇÑ´Ù.
Floating plug drawing became useful in the stainless tube industry in the 1960s and 1970s for long coils for down-hole oil exploration. It is an effective way to produce good-surface-quality tubing in continuous lengths longer than 1,000 ft.
Tooling is more critical for this operation than for any of the others. The bearing must be long enough to permit the plug to seat in the tube ID, but not so long that friction becomes a problem. In addition to tool design, lubrication and tube cleanness are critical to successful floating plug drawing.
Two chief advantages of floating plug drawing are that it achieves a higher material yield than any of the other processes and its long-length capability.
It is the only drawing process for applications that require long lengths with a smooth ID surface, such as down-hole oil exploration. Thermocouple sheathing that requires a smooth and ultraclean ID surface is best produced by floating or tethered plug drawing methods.

µÚ·Î ¸ñÂ÷·Î À§·Î


Search Engine Home