Processing Technology of Precipitation Hardened Stainless Steel Pump Shaft
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A precipitation-hardening, stainless steel pump technology, applied in the field of pump shaft processing technology, can solve the problems of easy fracture and failure of the pump shaft, and achieve good machining performance, excellent high temperature resistance mechanical properties, and good corrosion resistance.
Active Publication Date: 2019-03-29
SHENYANG SANKE HYDRAULIC MACHINERY MANUFACTORY
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[0005] The present invention aims at the problems existing in the above-mentioned prior art, and provides a processing technology of precipitation-hardening stainless steel pump shaft, which solves the problem that the pump shaft is easy to break and fail in the prior art
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[0042] Include the following steps:
[0043] 1. Forgings, configure molten steel according to GB1220-2007 "Stainless Steel Bars", forge steel ingots, and forge blanks after secondary remelting;
[0044] 2. Rough turning I: Support the above-mentioned blank with a center frame, clamp one end of the shaft, turn the end face of the stuck end flat, punch the blank with a center hole, the outer circle of the center hole has a unilateral allowance of 3-4mm, and the surface roughness is Ra6.3um ;
[0045] 3. UT inspection: Ultrasonic inspection is carried out on the workpiece after the above rough car I, according to the JB / T4730 standard;
[0046] 4. Heat treatment: The workpiece after the above UT inspection is subjected to solution treatment at 1040±10°C, water quenched, and the test block is in the same furnace;
[0047] 5. Rough turning II: clamp the workpiece after the above heat treatment to the other end, support the workpiece with the center frame, flatten the end face of ...
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Abstract
The invention relates to a machining process of a precipitation hardening stainless steel pump shaft. The machining process comprises the steps of: forging, rough turning I, UT inspection, heat treatment, rough turning II, high-temperature aging, semi-finish turning I, semi-finish turning II, low-temperature aging, grinding, finish turning I, polishing I, lineation, milling, polishing II, flaw detection, chromium plating, hydrogen removing treatment, chromium plating protection removal, polishing III, polishing IV, finishing, and obtaining of a finished product. The pump shaft machining process is low in hardening effect and size deformation, excellent in pump shaft machining size precision and high in surface smoothness, controls the size inspection below 40 DEG C after machining, is high in machining efficiency and quality, can guarantee the pump shaft size precision and low shape and position size tolerance deformation, and satisfies the drawing size requirements and the technical requirements.
Description
technical field [0001] The invention relates to a processing technology of a pump shaft, in particular to a processing technology of a precipitation-hardened stainless steel pump shaft. Background technique [0002] 0Cr17Ni4Cu4Nb is a typical martensitic precipitation-hardening stainless steel. Its nickel content is low, and its martensite transformation temperature is higher than room temperature. After cooling to room temperature through solid solution temperature, its structure transforms into martensite, and then undergoes aging treatment. The copper phase is precipitated in the martensite matrix, which further improves the strength. Due to the low carbon content, the steel has good machinability in solid solution state, and its corrosion and weldability are better than those of martensitic stainless steel. [0003] 0Cr17Ni4Cu4Nb has good corrosion resistance and high temperature oxidation resistance, and has excellent high temperature resistance mechanical properties b...
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