梯形丝杠螺母的配合标准有几点？

What are the matching standards for trapezoidal screw nuts?

梯形丝杠适用于大型螺纹的粗加工，在旋风铣削度螺杆的过程中，螺纹和滚花一次完成，效率高，成本低，加工精度低。其结构设计思想和方案具有较好的应用价值。

Trapezoidal screw is suitable for rough machining of large screw threads. In the process of whirlwind milling, the screw threads and knurling are completed at one time, with high efficiency, low cost and low machining precision. Its structural design idea and scheme have good application value.

1、丝杠螺母材质的选择

1. Material selection of lead screw nut

45#钢丝杠和40Cr钢丝杠调质的热处理工艺，调质是淬火加高温回火的双重热处理，目的是让工件具备良好的综合机械性能。调质钢丝杠分为碳素调质钢和合金调质钢两大类，无论是碳钢还是合金钢，其含碳量的控制都比较严格。梯形丝杠的原材料是通过模具拉光到所需要的中径尺寸，二次冷拉拉形成表面硬度(0.5 毫米深)达(18°-21°)。

Heat treatment process for 45# steel wire rod and 40Cr steel wire rod. Quenching and tempering is a dual heat treatment of quenching and high temperature tempering, so as to make the workpiece have good comprehensive mechanical properties. Quenched and tempered steel bars are divided into carbon quenched and tempered steel and alloy quenched and tempered steel. Carbon content of both carbon steel and alloy steel is strictly controlled. The raw material of the trapezoidal lead screw is polished to the required pitch diameter through the die, and the surface hardness (0.5mm deep) formed by the secondary cold drawing reaches (18 ° -21 °).

2、丝杠螺母的润滑

2. Lubrication of lead screw nut

建议对梯形丝杠采用油润滑，其中油池润滑或者滴油润滑这两种润滑方法更加有效。油池润滑较滴油润滑的方法更为合适，因为油池润滑法能够满足苛刻的条件，像高速、重负荷或者外部热传递，并且能够使梯形丝杠冷却。而滴油润滑更加适合用于中低速度和中轻负荷这两种情况。我们可以根据具体的使用条件选择合适的润滑方法。

It is suggested that the trapezoidal lead screw should be lubricated by oil, and the two lubrication methods of oil pool lubrication or oil dripping lubrication are more effective. The oil pool lubrication method is more suitable than the drop lubrication method, because the oil pool lubrication method can meet the harsh conditions, such as high speed, heavy load or external heat transfer, and can cool the trapezoidal lead screw. Oil dripping lubrication is more suitable for low and medium speed and light load. We can choose the appropriate lubrication method according to the specific service conditions.

3、丝杠和螺母的公差配合

3. Tolerance fit of lead screw and nut

YF45Mnv钢是85Kgf/mm(785N/mm)强度别的一切削非调质钢，其抗拉强度，疲劳性能，耐磨性能均优于传统常用的45调质钢及40Cr钢。钛浩产品选用YF45Mnv钢，也可选用45#调质钢及40Cr钢。螺母材质选用，螺母材质传统选用：锡青铜6-6-3及锡锌青铜5-5-5。

Yf45mnv steel is a kind of 85kgf/mm (785n/mm) strength non quenched and tempered steel. Its tensile strength, fatigue property and wear resistance are better than the traditional 45 Quenched and tempered steel and 40Cr steel. Yf45mnv steel, 45# quenched and tempered steel and 40Cr steel can be used for titanium Hao products. The nut material is selected, and the traditional nut material is: tin bronze 6-6-3 and tin zinc bronze 5-5-5.

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