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Machining technology for precipitation hardening stainless steel pump shaft

A precipitation hardening type, stainless steel pump technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problem of easy fracture and failure of the pump shaft, and achieve the effect of stabilizing the size, ensuring the dimensional accuracy, and eliminating the processing stress.

Inactive Publication Date: 2019-01-04
NINGBO ZEE AUTOMATION EQUIP
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  • Abstract
  • Description
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AI Technical Summary

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 precipitation-hardening stainless steel pump shaft, which solves the problem that the pump shaft is easy to break and fail in the prior art

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 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 technology for a precipitation hardening stainless steel pump shaft. The machining technology includes the following steps of forging, rough turning I, UT detection, heat treatment, rough turning II, high-temperature aging, semi-finish turning I, semi-finish turning II, low-temperature aging, coping and lapping, finish turning I, grinding I, lineation, milling,grinding II, flaw detection, chromium plating, dehydrogenation treatment, chromium plating removing protection, grinding III, grinding IV, finishing and finish product obtaining. By means of the machining technology for the pump shaft, the machining hardening effect is small, size deformation is small, the pump shaft machining size precision is good, the surface smoothness is high, and the finishing size inspection is controlled to be below 40 DEG C; and in addition, the machining efficiency is high, the quality is good, it can be ensured that the size precision and the shape and position dimensional tolerance deformation of the pump shaft are small, and drawing size requirements and technical requirements are met.

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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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D9/28
CPCB23P15/00C21D9/28
Inventor 刘建军
Owner NINGBO ZEE AUTOMATION EQUIP
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