Manufacture method and die for powder metallurgy inside spin ratchet wheel
A powder metallurgy and mold manufacturing technology, which is applied to the manufacturing method of powder metallurgy inner helical ratchet and the field of molds, can solve the problems of inability to form special-shaped internal helical gears, difficult control of the rotation speed of rotating parts, damage to molds and ingredients, etc. The effect of lowering, easier speed control, lower production cost
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Embodiment 1
[0063] A method for manufacturing a powder metallurgy internal helical ratchet, the method comprising the following steps:
[0064] The first step, mixing ingredients: mix the following powders evenly, in terms of mass percentage, wherein copper accounts for 1.5-2%, nickel accounts for 1.7-2%, molybdenum accounts for 0.5%, carbon accounts for 0.5%, manganese sulfide accounts for 0.3%, Micro-wax powder accounts for 0.3%, and the rest is the powder of pre-alloyed iron powder, mixed evenly,
[0065] The second step, pressing and forming: put the above powder in a pressing mold with a small mandrel rotation system with a friction plate structure and press it into a green compact with an inner spiral ratchet shape, with a pressure of 1100±5KN, pressing Density ≥ 6.85g / cm 3 , such as pressing density can be 7.2g / cm 3 , 7.3g / cm 3 ,
[0066] Wherein, it is composed of a pressing upper punch 1, a pressing middle die 2, a pressing lower punch 3, and a pressing mandrel member 4. The ...
Embodiment 2
[0071] A manufacturing mold for a powder metallurgy internal spiral ratchet, which consists of a pressing upper punch 1, a pressing middle die 2, a pressing lower punch 3, and a pressing mandrel member 4. The raw material powder is placed in the pressing middle die 2 and placed in the pressing lower punch 3 and the pressing upper punch 1, the lower part of the pressing upper punch 1 is provided with a limit hole 11 that matches the limit block 41 on the upper end of the mandrel 4. The shape of the limit block 41 is usually cylindrical. Cooperate, the shape of the limit hole 11 is also cylindrical, the shape of the inner mold cavity 21 of the pressing middle mold 2 is the same as the outer profile of the inner spiral ratchet wheel, and the upper part of the pressing lower punch 3 is provided with an outer spiral of the pressing mandrel member 4. The inner helical tooth 31 that tooth 41 matches, wherein the axial length of outer helical tooth 41 is longer than inner helical tooth...
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