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Method for improving hardenability by spray cooling and processing equipment improving hardenability by spray cooling

A processing equipment and hardenability technology, applied in the field of methods and processing equipment, can solve the problems of high cost of quenching agent, difficult process control, unstable product quality, etc. The effect of layer maximization

Pending Publication Date: 2021-12-03
临沂业隆通用机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of quenching agent is relatively high, and the consumption of quenching medium per ton is about 200 yuan, and the process control is difficult, and the product quality will be unstable due to fluctuations in the control process at any time

Method used

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  • Method for improving hardenability by spray cooling and processing equipment improving hardenability by spray cooling
  • Method for improving hardenability by spray cooling and processing equipment improving hardenability by spray cooling

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1: The processing equipment that utilizes spray cooling to improve hardenability includes a feeding device 1, an electromagnetic induction heating furnace and a cooling device 2. The feeding device 1 includes a workpiece clamping mechanism and a transmission device 3, and the transmission device 3 and the electromagnetic induction The furnace inlet of the heating furnace is connected, and the furnace outlet is connected with the cooling device 2 .

[0031] Such as figure 1 and figure 2 As shown, the workpiece clamping mechanism includes a frame 11, the frame 11 is fixedly connected with the transmission device 3, the transmission device 3 is provided with a plurality of transmission shafts 31, the transmission shaft 31 is provided with a limit groove 32, and the transmission shafts 31 are respectively installed Sprocket, adjacent two sprockets are connected by chains, frame 11 is provided with a support frame 18 that is fixedly connected, and support frame ...

Embodiment 2

[0041] Embodiment 2: The workpiece to be processed is 100mm in diameter, the material is 40Cr, the quenching heating temperature in step 1 is 780-800°C, the DC voltage of the electromagnetic induction heating furnace is 380V, and the intermediate frequency voltage is 520V; the tempering heating temperature is 610-620°C ℃, the DC voltage of the electromagnetic induction heating furnace is 340V, and the intermediate frequency voltage is 510V; after tempering, the temperature of the workpiece is reduced to normal temperature through natural cooling; the others are the same as in Embodiment 1. The workpiece hardness can reach 250-280HB.

Embodiment 3

[0042] Embodiment three: the workpiece to be processed is 110mm in diameter, the material is 42CrMo, the quenching heating temperature in step 1 is 750-770°C, the DC voltage of the electromagnetic induction heating furnace is 350V, and the intermediate frequency voltage is 480V; the tempering heating temperature is 650-660°C ℃, the DC voltage of the electromagnetic induction heating furnace is 340V, and the intermediate frequency voltage is 490V; the others are the same as in Embodiment 1. The workpiece hardness can reach 230-285HB.

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Abstract

The invention discloses a method for improving hardenability by spray cooling and processing equipment improving hardenability by spray cooling, and belongs to the field of heat treatment of shaft products. The method mainly comprises the following steps that a workpiece to be machined is placed in a hearth of an electromagnetic induction heating furnace to be heated; the heated workpiece is fed into a cooling device to be gradually cooled in a cooling water spraying manner; after the workpiece is cooled to the required temperature, the workpiece is put into the hearth of the electromagnetic induction heating furnace again to be subjected to tempering heating; and the temperature of the tempered and heated workpiece is reduced to the normal temperature in a natural cooling or spray cooling manner. Tempering and quenching are carried out by adopting a single workpiece pass-type cooling manner, the phenomenon that a hardening layer is unstable due to concentrated water cooling of a product is avoided, and the hardenability of the product is improved from 10-11 mm to 15-16 mm by improving heat treatment equipment under the condition that the product does not have hardening and tempering cracks, so that the hardenability of the product is improved to the maximum extent. The method and the equipment are mainly used for workpiece quenching.

Description

technical field [0001] The invention belongs to the field of heat treatment of shaft products, and in particular relates to a method for improving hardenability by spray cooling and processing equipment thereof. Background technique [0002] At present, in most machinery manufacturing enterprises, the commonly used process for quenching and tempering treatment of 42CrMo products is: 1. Quenching and quenching: use a box-type electric furnace to heat the workpiece to 810-830°C, heat it for 1 hour, and then water quench it. , oil cooling; 2, high temperature tempering: tempering temperature between 480-520 ℃, adjusted according to quenching and tempering hardness requirements, water cooling after tempering, to reduce tempering brittleness. During tempering and quenching, the workpiece to obtain a microstructure dominated by fine acicular martensite mainly depends on the heating temperature, holding time, and cooling capacity of the quenching medium. The existing quenching and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/10C21D1/25C21D1/667C21D9/28C21D11/00
CPCC21D1/10C21D1/25C21D1/667C21D9/0062C21D9/28C21D11/005C21D9/0018Y02P10/25
Inventor 杨明霞程世杰刘滨张传滨
Owner 临沂业隆通用机械有限公司
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