拉伸比是指管材成型模具中芯棒与口模间的环形截面积与管材截面积的比值。
轴向拉伸比和环向扩张比要合理匹配。
The axial drawing ratio and hoop extension ratio should be properly matched.
随着拉伸比、拉伸速度的提高和拉伸温度的降低，拉伸张力增大。
The drawing tension increases with the increase of drawing ratio and speed, and with the decrease of drawing temperature.
增大拉伸比、拉伸速度和拉伸温度能有效地减小张力波动和不匀率。
The tension fluctuation and irregularity of fiber decreases with the increase of drawing ratio, speed and temperature.
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