CN101559467A - Method for manufacturing roller - Google Patents

Abstract

The invention relates to a method for manufacturing a roller. The method combines casting with forging to manufacture the roller. Roughcast is sent to a water press or an oil press to be machined in a way of forging under heat condition, wherein the forging comprises the steps of forging and pressing as well as hammering the neck part of the roughcast roller. The forging of the roller which is manufactured by the invention is carried out on the neck part of the roller. Therefore, the machining quantity of the work piece is greatly reduced and the manufacture cost is drastically reduced to bring great economic efficiency to enterprises. In addition, the invention retains the advantages of cast products and forged products, namely, the invention not only retains the advantage of the forged products such as high density, plasticity and toughness and little quality problem but also retains the advantage of the cast products such as good wear resistance of the same material when a cast support roller body is used.

Description

A kind of manufacture method of roll

Technical field

The present invention relates to a kind of manufacture method of roll.

Background technology

Backing roll is of paramount importance parts on the milling train, and the weight of single backing roll is at several tons to up to a hundred tons or bigger.Its effect is that the supporting working roll is rolled operation.Backing roll is bearing huge draught pressure, moment of flexure and impact load when work.In addition, the temperature that is rolled material is very high, also needs the outer surface of spraying cooling water in the backing roll body of roll in rolling.Under the chilling and shock heating condition, work and very easily cause body of roll fatigue, rupture, peel off and the phenomenon of hot tearing easily in that the long-term work situation is next.Show that according to actual the position of the easiest generation fracture is in the joint portion of roll neck portion or the roll neck and the body of roll, and is comparatively thin because the relative body of roll of the diameter of roll neck is thinner, easily ruptures under huge draught pressure.Also have in addition one very important reasons be exactly in manufacture process, specifically be in roller stock cast and condensation process, because the roll neck up and down of backing roll roller stock is in respectively or near the insulated feeder and the sprue gate position of strand, cause the material purity of roll neck part to descend, and ruptures easily.Cause loss economically.Therefore, the quality requirement to the specification requirement of making roll and product is all high especially.The method of now making roll is two kinds, and a kind of is forging method, and another kind is the cast steel method.The each side quality of the roll that the employing forging method is made is all relatively good, also very desirable in the use.But because adopt the processing capacity of forging method big especially, the manufacturing cost height influences economic benefit of enterprises.Though and the employing casting method is lower on manufacturing cost, the quality of the product that it manufactures is not really desirable, differs greatly according to manufacturing a product than forging method.Product in use the great majority of the various quality problems that occur easily all be the casting products made thereby.Therefore say that the method for existing two kinds of manufacturing rolls all exists certain problem.

Summary of the invention

At the problems referred to above, the objective of the invention is to propose a kind of method of new manufacturing roll, the problem that exists with the roll that solves existing method manufacturing.

Technical scheme of the present invention is to adopt casting and forge the method manufacturing roll that combines.Its technological process is: cast, forging, roughing, flaw detection, modified, semifinishing, final heat treatment, fine finishining.Cast roll blank in roll sandbox mould, is made roll blank through casting with pouring molten steel earlier.Hydraulic press delivered under hot state by blank or the enterprising row of hydraulic press forges processing, and processing is that the roll neck to blank partly adopts forging and pressing and forges, and forging ratio is 3-6.To carry out conventional heat treatment after the forging.Again forging is carried out quality inspection, flaw detection.Carry out roughing again.And then carry out conventional conditioning treatment.Carry out mechanical performance test, Hardness Surveillance etc. by technical regulation again after the processing.And then, make roll through semifinishing, final heat treatment and fine finishining.

The cast blank adopts attaches sandbox for fabricated structure, and the bottom is a under casing, and pars intermedia is a cold mould, and top is rising head.The outside of built-up flask is a housing, has the molding sand layer on the inner walls, has heat-insulation layer in rising head inside.In the middle of the under casing is big volume die cavity.The method of teeming or rising pouring is adopted in the cast of blank.Reserve the processing part during casting, cut away adding the man-hour part that impure amount is big, to keep the material purity of roll.

The inventive method is simple, and is easy to implement, employing be to forge and method that casting combines is made roll, forging is that the roll neck of breaker roll is partly processed.So just greatly reduce the processing capacity of workpiece, manufacturing cost is reduced significantly, for enterprise brings great economic benefit.According to calculating, the cost of one ton of backing roll of every manufacturing is compared with making forging backing roll cost, can save 8000 yuan, and by every heavy average 50 tons of calculating of backing roll, economic benefit is then very objective.In addition, adopt the inventive method to make the advantage that roll has kept forging and cast article, both kept density increase, its plasticity and the toughness in roll neck process forging and pressing processing back of forging backing roll own to increase substantially, seldom occur quality problems in the use.Kept simultaneously the casting backing roll body of roll part good advantage of same material wearability in use again.

The present invention does not have accompanying drawing

The specific embodiment

Adopt conventional top pouring or bottom running, pouring molten steel in roll sandbox die cavity, after solidifying, is carried out the check of roller stock surface quality.Under the hot state of roller stock, carry out heat treated then again.Deliver to after pending and forge processing on the forcing press.Processing is that the roll neck to blank partly forges processing.Through one to two fire time forging molding, the forging ratio of roll neck 〉=3.Forge and adopt fast the forging and free forging process.Then forging is carried out the heat treatment first time.Heat treatment adopts car-type heat treating furnace to carry out.Carry out the forging quality check then, size detection and blank are visited a part detection.Carry out the roughing of forging after to be detected.Lathe and boring machine are adopted in roughing.After roughing, carry out conditioning treatment again.Conditioning treatment adopts car-type heat treating furnace to carry out.The mechanical performance of carrying out workpiece then detects and the hardness detection.Carry out semifinishing after the detection, this operation adopts lathe and boring machine to finish.Carry out the check of specification and fineness after the processing again.To be tested qualified, reach quality standards and will carry out final heat treatment, the processing of quenching is sprayed with the fog quenching lathe in tempered stove differential temperature stove heating back.Carry out fine finishining after pending.Lathe is adopted in fine finishining, and grinding machine and boring machine carry out, and finish the manufacturing of roll.The technology that is adopted among the present invention is the common processes technology, and equipment also is existing equipment.

Claims (1)

1, a kind of manufacture method of roll, its technological process is: cast, forging, roughing, flaw detection, modified, semifinishing, final heat treatment, fine finishining, it is characterized in that: hydraulic press delivered under hot state by blank or the enterprising row of hydraulic press forges processing, processing is that the roll neck to blank partly adopts forging and pressing and forges, and forging ratio is 3-6.