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Rotary Die Extrusion Process of Screw Pump Rotor

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, difficulty in turning the outer circle, and reduction of spheroidized cores, etc., to achieve improved resistance Scaling performance, reduction of metal surface oxide generation, reduction of material loss effect

Active Publication Date: 2022-02-08
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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  • Rotary Die Extrusion Process of Screw Pump Rotor
  • Rotary Die Extrusion Process of Screw Pump Rotor
  • Rotary Die Extrusion Process of Screw Pump Rotor

Examples

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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 , and then lowered to 790°C with the furnace, and finally annealed at a cooling rate of 0.65°C / min. Among them, the metal blanks include: 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 a diameter of Ф49, then soak the metal billet in saponified oil (sodium stearate) for 30 minutes, an...

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 rotary-die extrusion molding process for a screw pump rotor. The invention provides a screw pump rotor rotary die extrusion molding process, comprising: performing isothermal spheroidization annealing on the metal blank, and ultrasonically treating the metal blank for 8-30 seconds before annealing; turning the outer circle of the annealed metal blank, Then sandblasting and shot blasting treatment, the metal blank is placed in saponified oil and soaked for 10-30 minutes, and lubricated, wherein the saponified oil contains 0.5-8% nano-silicon carbide, and the nano-silicon carbide has a particle size of 20-60nm , 140-200nm nano-silicon carbide mixture, the mixing weight ratio is 1:2.8-4; at room temperature, put the lubricated metal billet into the extrusion cylinder for rotary extrusion molding to obtain the finished product.

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 Patents(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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