一、辊式拉模装置图1的a、b是A-51型辊式拉模,用来拉制φ5.0—2.5毫米的钢丝和φ10—2.5毫米的铝丝的拉制中。对于较粗的线材,使用较大的A-71型辊式拉模。这种装置如图2所示,它具有二组辊子,第一组辊子为椭圆孔型,第二组为圆孔型。圆断面坯料在第一组辊子加工成椭圆形,然后在第二组辊子沿其长径方向又加工成圆形线材。这样,在一台辊式拉模中具有两组辊子,一次拉制就能完成圆→椭圆→圆的加工,将这种 First, the roller die device Figure 1 a, b is A-51-type roller die, used to pull φ5.0-2.5 mm steel wire and φ10-2.5 mm aluminum wire drawing. For thicker wires, use a larger A-71 roll die. This device is shown in Figure 2, which has two sets of rollers, the first set of rollers is oval, the second set of round. Circular cross-section billet in the first set of rollers processed into an oval, and then in the second set of long-diameter roller along its direction into a circular wire. In this way, in a roller die with two sets of rollers, a drawing will be able to complete the round → oval → round processing, this