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影響鱷魚式金屬剪切機單位剪切抗力的因素：
1、金屬性質：金屬材料的強度極限越高，則單位剪切抗力就越大；塑性越低，對應于剪斷時的相對切入深度就越小，既金屬斷的就越早。因此單位剪切抗力與金屬的強度和塑性有關。
2、剪切溫度：鋼板剪切時的溫度越高，單位剪切抗力就越小，對應于剪斷相對切入深度則越大。
3、變形速度：熱剪時，理論上變形速度與剪切速度成正比關系，單位剪切抗力隨變形速度的增加而增加；冷剪時，剪切速度對單位剪切抗力的影響很小，一般可以不考慮。
4、剪刃側向間隙：剪刃側向間隙的大小，可以使剪切時的受力狀況發(fā)生變化。當側向間隙由零逐漸增大時，鋼板的受力狀況分別為壓縮—剪切—彎曲狀態(tài)，側向間隙過小或過大都會使單位剪切抗力增加。因此，合理選擇和保持剪刃側向間隙的大小，對于正確使用鱷魚式剪切機是十分重要得。
5、刀鈍半徑：刀鈍半徑的大小，直接影響單位剪切抗力的大小。刀鈍半徑越大，刀就越不“快”，剪切抗力就越大。但在壓入階段
金屬剪切機的計算中，不考慮刀鈍半徑的影響是允許得。
6、剪切斷面的寬高比b/h：b當/h小于1時，τ與b/h幾乎無關；當b/h大于1時，τ值隨b/h的增大而迅速增大(z—剪刃壓入鋼板的深度)。
除上述因素影響外，壓板、剪刃與鋼板的摩擦系數(shù)及剪刃的幾何形狀等因素，對單位剪切抗力也都有一定的影響，但這些因素相對來說影響很小，可以忽略不計。
The factors influencing crocodile type shear machine unit shear resistance:
1, metal properties: the ultimate strength of metal materials is higher, the greater the unit shear resistance; The lower plasticity, corresponding to the cut when cutting depth is, the smaller the relative, the metal break the sooner. So the unit shear resistance related to the strength of the metal and plastic. 2, cutting temperature, the higher the temperature of the steel plate shear, the smaller unit shear resistance, corresponding to the relative cut into the depth of cut is the greater. 3, deformation speed: hot cut, deformation speed is proportional to the shear velocity relationship in theory, the unit shear resistance increases along with the increase of strain rate; Cold cut, the influence of shear rate on the unit shear resistance is very small, generally can not consider. 4, lateral clearance of shear blade: the size of the lateral clearance of shear blade, can make the change of shear force. When the lateral clearance by the zero increase gradually, the stress of the steel plate respectively, compression, shear, bending the lateral clearance is too small or too metropolitan increase unit shear resistance. Therefore, rational selection and keep the size of the lateral clearance of shear blade, for the correct use of crocodile type shear machine is very important. 5, a blunt knife radius: the size of the knife is blunt radius, directly affects the size of the unit shear resistance. The less the greater the radius of a blunt knife, knife "fast", the greater the shear resistance. But in the pressure into the stage
The calculation of shearing machine, does not consider the influence of the radius of a blunt knife is allowed.
6, shear ratio of high to width of cross section b/h: when b/h is less than 1, tau has nothing to do with b/h almost; When b/h is greater than 1, tau value increases quickly with the increase of b/h (z - shear blade pressure into the depth of the steel plate). Besides the influence of the above factors, the clamp, cutting edge and the friction coefficient of steel plate and shear blade geometry factors, such as shear resistance to the unit also has a certain impact, but these factors are relatively small, negligible.
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