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A method for processing cold-rolled work rolls of complete martensitic alloy steel after hardening and cryogenic cooling

A cold-rolled work roll, martensite technology, applied in the direction of roll, metal rolling, metal rolling, etc., can solve the problems of high cost, complex hard cutting process, low efficiency, etc., achieve small bending deformation, reduce processing Difficulty and productivity, smooth cutting effect

Active Publication Date: 2017-08-25
马鞍山市恒久特材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of complex hard cutting process, low efficiency and high cost of hard cutting process of alloy steel cold-rolled work rolls after hardening, especially after forming complete martensitic structure through cryogenic process, the present invention provides a process hardening cryogenic The method of cold-rolling work rolls with complete martensitic alloy steel breaks through the cutting forbidden zone of the martensitic hardened layer of the roller shaft parts, realizes powerful cutting, and achieves the beneficial effects of high precision and high efficiency

Method used

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  • A method for processing cold-rolled work rolls of complete martensitic alloy steel after hardening and cryogenic cooling
  • A method for processing cold-rolled work rolls of complete martensitic alloy steel after hardening and cryogenic cooling
  • A method for processing cold-rolled work rolls of complete martensitic alloy steel after hardening and cryogenic cooling

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Embodiment 1

[0047] A method for processing cold-rolled work rolls of complete martensitic alloy steel after hardening and deep cooling, comprising the steps of:

[0048] S1. Adopt CNC dual-frequency scanning quenching to precisely control the bending deformation of the cold-rolled work roll of hardened martensitic alloy steel to be cut within 2.5 / 1000mm~3 / 1000mm, that is, to control the maximum bending deformation of the work roll per 1000mm length Within 2.5 ~ 3mm;

[0049] Controlling the deformation per unit length of the work roll to be cut can effectively reduce the machining allowance, thereby reducing the processing difficulty of removing the excess martensitic hardened layer in the subsequent steps to a certain extent, thereby improving production efficiency;

[0050] S2. For the hardened martensitic alloy steel cold-rolled work roll obtained in step S1, use "a kind of machine tool for automatically centering and milling the end face, punching the center hole and covering the oute...

Embodiment 2

[0069] This embodiment is basically the same as Embodiment 1, the difference is: in step S3, a kind of machine tool of special configuration is improved based on a lathe with a turning diameter of 500, and its guide rail 4 adopts a three-rail structure, and the width of the three guide rails is 850mm, which greatly improves The rigidity and stability of the machine tool are improved; the large carriage 7 and the rotary tailstock 5 are respectively misplaced and arranged on the guide rail 4, the width of the middle carriage 6 is 480mm, and the electric tool holder 3 is fixedly arranged on the middle carriage 6 Above; the rotary tailstock has a built-in rotary top, the diameter of the tailstock sleeve is 220mm, and the diameter of the rotary shaft is 160mm; the main motor is equipped with an AC servo spindle motor with a power of 22KW; the width of the electric tool rest is designed to be 300mm ×300mm.

Embodiment 3

[0071]Since alloy steel cold-rolled work rolls do not form a complete martensite structure during the hardening process, there are still some residual austenite structures. This is an unavoidable technical difficulty in the heat treatment industry, and it is the cause of The source of the local spalling phenomenon; in a method of processing hardened and deep-cooled complete martensitic alloy steel cold-rolled work rolls in this embodiment, the cutting work is to be performed after the quenching treatment in step S1 and before the center hole at the two ends is re-corrected in S2 The rolls are subjected to a cryogenic process. Specifically, the hardened alloy steel cold-rolled work rolls are placed in a liquid nitrogen extreme cold box at minus 193°C, and then cryogenically cooled for 4 hours. Through the cryogenic process, the alloy steel cold-rolled work rolls Part of the residual austenite structure in the roll matrix is ​​completely transformed into martensite structure; at ...

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Abstract

The invention discloses a method for machining a complete martensitic alloy steel cold working roll after hardening and copious cooling, belongs to the field of cutting work, and solves the problems of complex process, low efficiency and high cost of the conventional hardened martensitic alloy steel cold working roll hard cutting process. The method disclosed by the invention comprises the following steps: S1, controlling the length bending deformation of a working roll to be cut after quenching; S2, correcting a central hole in the second end of the working roll to be cut; S3, mounting the working roll, of which the central hole in the second end is corrected in the step S2, on a dedicated configuration lathe, wherein the dedicated configuration lathe comprises a main motor, a reducer, a spindle box, a large carriage, a medium carriage, an electric tool carrier, a guide rail and a rotary tailstock; S4, mounting an integral CBN tool on the electric tool carrier of the lathe, and optimizing the angle and the parameters of the integral CBN tool; and S5, setting machining parameters of the dedicated configuration lathe, and carrying out powerful cutting to fulfil cutting at a time. The method disclosed by the invention has the advantages that the cutting forbidden area of a martensitic hardened layer of a roll shaft-type part is broken through; powerful cutting is realized; and the effects of high precision and high efficiency are achieved.

Description

technical field [0001] The invention belongs to the field of metal mechanical cutting and processing, and in particular relates to a powerful cutting method for processing cold-rolled work rolls of complete martensitic alloy steel after quenching and cryogenic cooling. Background technique [0002] The hardness of the alloy steel cold-rolled work roll after heat treatment and quenching is generally HRC61-64 degrees. Since the diameter of the cold-rolled work roll is generally φ110mm-φ250mm, the total length is 850mm-2300mm, and the diameter of the two-end bearing stop is φ70mm---φ130mm. The ratio of lengths belongs entirely to the slender axis. There will be relatively large bending deformation during heat treatment and quenching. In the process, it is generally necessary to leave a margin of 2-2.5mm on one side for the finished product size before fine grinding, but the deformation margin left after surface hardening is the traditional machining method. Can not be cut off ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B21B27/00
CPCB21B27/00B23P15/00
Inventor 罗吉平石明良
Owner 马鞍山市恒久特材有限公司
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