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Link plate balling and annealing technology

An annealing process and chain plate technology, applied in the field of chain plate spheroidization annealing process, can solve the problems of large cold deformation capacity, large energy waste and high heat preservation temperature, and achieve the effects of large deformation capacity, short heat preservation time and low hardness

Active Publication Date: 2013-04-03
TANGSHAN JINSHI SUPER ABRASIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Metal heat treatment is to heat a metal workpiece in a certain medium to a suitable temperature, and keep it at this temperature for a certain period of time, then cool it in a different medium at different speeds, and control its surface or internal microstructure by changing the metal material. A process of performance; among them, spheroidizing annealing is an annealing method only applied to steel, heating the steel to 20-30°C above Ac1, keeping it warm for a period of time, then slowly cooling to a temperature slightly lower than Ar1 and staying for a period of time , the purpose is to make the lamellar cementite and proeutectoid cementite in the pearlite become spherical and evenly distributed in the ferrite matrix. The medium carbon steel and high carbon steel with this structure have low hardness and are Good machinability and large cold deformation ability; the chain plate parts made of traditional 45 and 40Mn steel are stamped from hot-rolled steel plate after cold rolling; due to the organization of raw materials, banded and reticular pearlite structures often appear, and The hardness is very high, and it is necessary to add a raw material annealing process before stamping; the traditional annealing is complete annealing, and generally adopts 920 ℃ heat preservation for a certain period of time. In the annealing process, the holding temperature is high, the time is long, the waste of energy is great, and quality problems such as uneven hardness are prone to occur.

Method used

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  • Link plate balling and annealing technology

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Embodiment Construction

[0020] Such as figure 1 The shown spheroidizing annealing process for chain plates includes the following steps:

[0021] A: Place the chain plate on the material pan set in the barrel of the spheroidizing annealing furnace, and close the furnace cover;

[0022] B: Increase the temperature in the inner barrel to 720°C at a heating rate of 5°C / min;

[0023] B1: Open the exhaust valve at the exhaust port of the inner barrel of the spheroidizing annealing furnace;

[0024] B2: Set the spheroidizing annealing furnace to start to heat up. By monitoring the temperature sensor in the barrel of the spheroidizing annealing furnace, when the temperature in the barrel of the spheroidizing furnace rises to 300°C, open the air inlet valve at the inlet of the inner barrel at this time Fill the inner barrel with nitrogen; adjust the nitrogen flow rate to 15m by monitoring the gas flowmeter at the air inlet of the inner barrel 3 / hr;

[0025] B3: When the air in the inner barrel is exhausted through ...

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Abstract

The invention discloses a link plate balling and annealing technology which comprises the following steps of: putting a link plate on a tray in an inner barrel of a balling and annealing furnace and closing a furnace cover; heating the inner barrel to the temperature of 720 DEG C at the speed of 5 DEG C per minute; preserving the heat for 5 hours; slowly cooling the inner barrel to the temperature of 650 DEG C, and closing an air inlet valve to stop charging methanol gas; forcibly cooling the inner barrel to the temperature of 500 DEG C in 3 hours; and opening the furnace cover, hoisting the link plate out of the furnace, and cooling the link plate to normal temperature with air. The technology can ensure that the treated workpiece has good cutting performance, low hardness and high deformability, so that the quality and the service performance of the product are improved.

Description

Technical field [0001] The invention relates to a chain plate spheroidizing annealing process. Background technique [0002] Metal heat treatment is to heat a metal workpiece in a certain medium to an appropriate temperature, and then keep it at this temperature for a certain period of time, and then cool it in different mediums at different speeds, and control it by changing the surface or internal microstructure of the metal material. A process of performance; spheroidizing annealing is an annealing method only applied to steel. The steel is heated to 20-30℃ above Ac1, kept for a period of time, and then slowly cooled to a temperature slightly lower than Ar1 and stayed for a period of time , The purpose is to make the flake cementite and proeutectoid cementite in the pearlite become spherulites and evenly distributed in the ferrite matrix. The medium carbon steel and high carbon steel with this structure have low hardness and low hardness. Good machinability and large cold def...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/32
Inventor 田绍洁
Owner TANGSHAN JINSHI SUPER ABRASIVE
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