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Screw pump rotor rotary die extrusion forming process

A technology of extrusion molding and screw pump, which is applied in the field of screw pump rotor rotary die extrusion molding technology, can solve the problems of very strict softening annealing and cooling process requirements, reduction of spheroidized cores, and difficulty in turning outer circles, etc., to achieve improved resistance Scaling performance, reduction of material loss, and reduction of metal surface oxides

Active Publication Date: 2021-03-19
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the conventional softening annealing and cooling process requires very strict
For example, when using spheroidizing annealing to eliminate work hardening, if the temperature is too high or the holding time is too long, the spheroidized core will be reduced, which will easily cause difficulty in turning the outer circle, low production efficiency, high production cost, and poor performance of the obtained rotor.

Method used

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  • Screw pump rotor rotary die extrusion forming process
  • Screw pump rotor rotary die extrusion forming process
  • Screw pump rotor rotary die extrusion forming process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: A rotary die extrusion molding process for a screw pump rotor:

[0040] This embodiment provides a rotary die extrusion molding process for a screw pump rotor, which specifically includes:

[0041] 1) Heat treatment: heat the metal blank to 1050°C within 5 hours, heat preservation treatment for 3 hours, lower the temperature to 840°C, hold isothermal heat for 5 hours, and then perform ultrasonic treatment at 800°C for 20s, the frequency of ultrasonic treatment is 20kHz, and the power density is 2.6 W / cm 2 , then lowered to 790°C with the furnace, and finally annealed at a cooling rate of 0.65°C / min. Among them, the metal blank includes: carbon steel (2.06% carbon content) 64.5%, chromium 24%, nickel 8%, titanium 3.4%, zirconium 0.1%, that is, the mass percentage of chromium and nickel is 1:0.33;

[0042] 2) Machining: Turn the annealed metal billet to Ф49, then soak the metal billet in saponified oil (sodium stearate) for 30 minutes, and perform lubricat...

Embodiment 2

[0046] The difference between this example and Example 1 is that in this example, the metal blank is carbon steel without adding chromium, nickel, titanium, or zirconium.

Embodiment 3

[0048] The difference between this embodiment and Example 1 is that in this example, the metal blank includes: 64.5% carbon steel, 25% chromium, 6% nickel, 4.4% titanium, 0.1% zirconium, that is, the mass percentage of chromium and nickel It is 1:0.24.

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Abstract

The invention relates to the technical field of screw pumps, in particular to a screw pump rotor rotary die extrusion forming process. The screw pump rotor rotary die extrusion forming process comprises the following steps: isothermal spheroidizing annealing is carried out on a metal blank, and ultrasonic treatment is carried out on the metal blank for 8-30 seconds before annealing; the annealed metal blank is subjected to outer circle turning, then sand blasting and shot blasting treatment is conducted, the metal blank is placed in saponification oil to be soaked for 10-30 min, lubricating treatment is conducted, the saponification oil contains 0.5%-8% of nano silicon carbide, the nano silicon carbide is a nano silicon carbide mixture with the particle size ranging from 20 nm to 60 nm andthe particle size ranging from 140 nm to 200 nm, and the mixing weight ratio is 1: 2.8-4; and at the room temperature, the lubricated metal blank is put into an extrusion cylinder to be subjected torotary die extrusion forming, and a finished product is obtained.

Description

technical field [0001] The invention relates to the technical field of screw pumps, in particular to a rotary-die extrusion molding process for a screw pump rotor. Background technique [0002] The screw pump is a rotary pump that relies on the volume change and movement of the meshing space formed by the pump body and the screw to deliver or pressurize the liquid. It has the characteristics of stable delivery medium, low turbulence of the discharge medium, weak pressure pulsation, small mechanical vibration, and low noise. Low, self-priming performance, good suction performance, high speed working ability, insensitive to the viscosity of the medium, simple and compact structure, small size, light weight, high efficiency, reliable work, long life, easy operation and easy maintenance. Therefore, the screw pump is widely used in the following four aspects: conveying liquid; realizing multi-phase mixed transportation of liquid, gas and solid; conveying viscous medium with extr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00C22C38/50C21D6/004C21D1/32C22C38/02C22C38/44B21C23/002
Inventor 竺柏康陶亨聪张乐丁波
Owner ZHEJIANG OCEAN UNIV
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