Machining technology for PH stainless steel pump shaft

A precipitation hardening type, 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 the effects of stabilizing the size, ensuring the dimensional accuracy, and eliminating the processing stress.

Inactive Publication Date: 2018-03-16
马迎春
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Problems solved by technology

[0005] The invention aims at the problems existing in the above-mentioned prior art, and provides a processing technology for a preci

Method used

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Experimental program
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Embodiment

[0042] Include the following steps:

[0043] 1. Forgings, configure molten steel according to GB1220-2007 "Stainless Steel Rods", 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 processing technology for a precipitation-hardened stainless steel pump shaft, which comprises the following steps: forging, rough turning I, UT inspection, heat treatment, rough turning II, high temperature aging, semi-finishing I, semi-finishing II, low temperature Aging, repairing, finishing turning I, grinding I, scribing, milling, grinding II, flaw detection, chrome plating, dehydrogenation treatment, removal of chrome protection, grinding III, grinding IV, trimming, to obtain the finished product. The pump shaft processing technology of the present invention has small work hardening effect, small dimensional deformation, good dimensional precision of pump shaft processing, and high surface finish. The finished size inspection is controlled below 40°C; and the processing efficiency is high and the quality is good, which can ensure the dimensional accuracy of the pump shaft and the small deformation of the shape and size tolerances, and meet the dimensional requirements and technical requirements of the drawings.

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...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 马迎春
Owner 马迎春
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