CN103350313B

CN103350313B - Centrifugal casting roll cold mould renovation technique

Info

Publication number: CN103350313B
Application number: CN201310212941.7A
Authority: CN
Inventors: 刘建朝
Original assignee: Sinosteel Xingtai Machinery and Mill Roll Co Ltd
Current assignee: Sinosteel Xingtai Machinery and Mill Roll Co Ltd
Priority date: 2013-05-31
Filing date: 2013-05-31
Publication date: 2016-05-11
Anticipated expiration: 2033-05-31
Also published as: CN103350313A

Abstract

The renovation technique that the invention discloses a kind of centrifugal casting roll cold mould, comprises following processing step: A, scraps cold mould reaming: to the cold mould reaming of scrapping, remove on cold type inner wall, be with defective material completely. B, produce corresponding neck bush: produce the neck bush of external diameter and cold mould internal diameter interference fit, the internal diameter of neck bush is corresponding with the external diameter blank dimension of roll. C, assembling: adopt hot-mounting process, first cold mould is carried out to heat temperature raising processing, in the time that cold mould temperature rises to 400 DEG C～450 DEG C, neck bush is press-fited to cold mould endoporus. D, fixing: the cold mould of having assembled and neck bush are cooled to after normal temperature, fix on the periphery at neck bush external diameter and cold mould internal diameter seam crossing two ends with some junction of the edges of two sheets of paper screws. The present invention repairs improvement to the cold mould of scrapping, and has extended the service life of cold mould, has improved the utilization rate of cold mould. By the recycling to cold mould, significantly reduce production cost.

Description

Centrifugal casting roll cold mould renovation technique

Technical field

The present invention relates to the recycling technology of frock that a kind of centrifugal casting is used, centrifugal specificallyThe renovation technique of cold mould for casting roll.

Background technology

Roll is a kind of foundry goods that not only needs to bear larger load but also need surface abrasion resistance. Produce at present the master of rollWanting technique is centrifugal casting. While producing centrifugal casting roll blank, be by the outer layer metal of the high rigidity of roll firstCentrifugal casting, in a cold mould, arranges respectively one end top box at the forward and backward two ends of cold mould, make cold mould and front,Between latter two end cap case, form cast die cavity, when cast, first cast is placed on centrifugal casting machine, molten ironInject the die cavity of High Rotation Speed, utilize centrifugal action to make molten iron outside die cavity inwall formation roll high rigidityLayer blank, then takes off cold mould, cold mould and the end is emitted to case is vertical to be connected, the sky of the outer blank in cold mouldIn chamber, cast core of the roll, obtains solid roller cast blank.

Produce in the process of roll in centrifugal casting, cold mould is the main perishable tool that roll is produced, centrifugalCasting roll is produced cold mould material used and is generally casting pig, and cold mould is in the course of the work due to cold type inner wallDirectly contact with molten iron, cold type inner wall is subject to serious chilling and shock heating repeatedly, and general cold mould wall is thicker, thereforeIt is larger to there is loose tendency in cold type inner wall, so be easy to chap at the inwall of cold mould.

After cold type inner wall cracks, can make roll uneven in temperature in process of setting, thereby roller surface is producedRaw crackle, causes roll to scrap. Cold mould needs High Rotation Speed in the time of work simultaneously, if wall thickness tolerance differs greatly,The amount of unbalance causing can cause cold mould to produce vibration, if change not in time, not only affects product quality, alsoEasily cause security incident. Use 20 left and right to scrap so cold mould is general, the main cause of scrapping justThe quality problems of inwall. After scrapping, need to make new cold mould, and cold mould and static casting for centrifugal castingCompare by cold mould, required precision is high, manufacturing process complexity, manufacturing cost costliness. Once split if cold mould producesLine is just scrapped and is renewed, and can cause very large waste, has increased production cost.

Summary of the invention

It is simple that the technical issues that need to address of the present invention are to provide a kind of technique, implements centrifugal casting easily and rollThe renovation technique of cold mould for roller.

For solving the problems of the technologies described above, the technical solution adopted in the present invention is:

The renovation technique of cold mould for centrifugal casting roll, is characterized in that comprising following processing step:

A, scrap cold mould reaming: to the cold mould reaming of scrapping, remove on cold type inner wall and be with defective material,The defect that ensures cold type inner wall impact use can be eliminated completely, and after processing, the surface roughness of cold mould endoporus isRa1.6～Ra3.2。

B, produce corresponding neck bush: produce the neck bush of external diameter and cold mould internal diameter interference fit, value of interference fitFor 0.2mm～0.5mm, the internal diameter of neck bush is corresponding with the external diameter blank dimension of roll; The surface of neck bushRoughness is Ra1.6～Ra3.2;

C, assembling: cold mould and neck bush adopt hot-mounting process, first cold mould are carried out to heat temperature raising processing, when coldWhen type temperature rises to 400 DEG C～450 DEG C, neck bush is press-fited to cold mould endoporus;

D, fixing: the cold mould of having assembled and neck bush are cooled to after normal temperature, in neck bush external diameter and cold mouldOn the periphery at seam crossing two ends, footpath, fix with some junction of the edges of two sheets of paper screws.

Further improvement of the present invention is: described neck bush is selected the material identical or close with cold mould.

Owing to having adopted technique scheme, the technological progress that the present invention obtains is:

The present invention repairs and improves the cold mould of scrapping, by interference fit one again after the cold mould reaming of scrappingNeck bush, can continue to use, and has extended the service life of cold mould, has improved the utilization rate of cold mould. Only logicalCross and process a neck bush and just can allow and scrap cold mould and reused, the Meteorological of cold mould has reduced 70%Above, significantly reduced production cost.

Cold mould and neck bush adopt interference fit the seam crossing end face junction of the edges of two sheets of paper screw fastened at both, preventIn centrifugal casting production process, when cold mould and neck bush High Rotation Speed, relatively rotate, guarantee is producedCarry out smoothly.

Adding man-hour surface roughness is Ra1.6～Ra3.2, ensures surperficial fineness, is conducive to coordinate install.Cold mould and neck bush adopt hot-mounting process, make full use of the characteristic that material is expanded with heat and contract with cold, and can facilitate smoothlyCarry out the assembling of interference fit.

The material of neck bush need to be selected the material identical or close with cold mould, when junction of the edges of two sheets of paper screw is installedCan prevent junction of the edges of two sheets of paper screw generation deflection, guarantee the effect of fixing and locking.

Brief description of the drawings

Fig. 1 is the structural representation after utilizing cold mould that technique of the present invention completes to repair.

Wherein, 1, neck bush, 2, cold mould, 3, junction of the edges of two sheets of paper screw.

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is described in further details:

The renovation technique of cold mould 2 for centrifugal casting roll, comprises following processing step:

A, scrap cold mould 2 reamings: utilize the mode of machining to expand the internal diameter size of scrapping cold mould 2, warpCross after expansion endoporus, guarantee that on the inwall of cold mould 2, defective position can be removed completely, crack, splitLines etc. affect the normal defect using of cold mould 2 to be eliminated completely. For the assembling effect after not affecting, should protectThe endoporus fineness of card cold mould 2, after processing, the surface roughness of cold mould 2 endoporus is Ra1.6～Ra3.2.

B, produce corresponding neck bush 1: select the material identical or close with cold mould 2 to carry out processing linerCover 1, inner surface and the outer surface roughness of neck bush 1 are Ra1.6～Ra3.2. For preventing in centrifugal castingIn production process, neck bush 1 relatively rotates in the time of High Rotation Speed with cold mould 2, affects the quality of product,Neck bush 1 and cold mould 2 are arranged to interference fit. Because neck bush 1 needs interference fit with cold mould 2,Add man-hour neck bush 1 outside dimension than the large 0.4mm of the internal diameter size of cold mould 2; The internal diameter of neck bush 1 withThe external diameter blank dimension of centrifugal casting roll is corresponding.

C, assembling: in the time carrying out the assembling of interference fit, for reducing resistance, assemble easily and fast,Hot-mounting process is selected in the assembling of cold mould 2 and neck bush 1: cold mould 2 is taked to the pre-heat treatment, cold mould 2 is addedHot to 420 DEG C, the principle features of utilizing material to expand with heat and contract with cold, the interior hole dimension of cold mould 2 on the original basis canSwell to some extent, now in time neck bush 1 is press-fited to cold mould 2 endoporus.

D, fixing: neck bush 1 is positioned in cold mould 2, when bulk temperature is reduced to after room temperature, at neck bushOn the periphery at 1 external diameter and cold mould 2 internal diameter seam crossing two ends, some junction of the edges of two sheets of paper screws 3 are installed in border, guarantee to fixLocking effect, while preventing High Rotation Speed there is relative sliding dislocation in neck bush 1 and cold mould 2, affects product matterAmount.

So far, the repairing and reusing technique of cold mould completes. Cold mould after reparation can put into production use again.Utilize the structural representation of the cold mould after reparation of the present invention completes as shown in Figure 1.

Utilize the present invention, can repeatedly repair cold mould, under the prerequisite that does not affect production, extend cold mouldService life, improve cold mould utilization rate, reduce production costs.

The present invention goes for all centrifugal casting roll cold moulds that barrel length is less than 5000mm.

Claims

1. the renovation technique of cold mould for centrifugal casting roll, is characterized in that comprising following processing step:

A, scrap cold mould reaming: utilize the mode of machining barrel length to be less than to the cold mould of scrapping (2) reaming of 5000mm, remove on cold mould (2) inwall and be with defective material, the defect that ensures cold mould (2) inwall impact use can be eliminated completely, and after processing, the surface roughness of cold mould (2) endoporus is Ra1.6 ~ Ra3.2;

B, produce corresponding neck bush: produce the neck bush (1) of external diameter and cold mould (2) internal diameter interference fit, value of interference fit is 0.4mm, and the internal diameter of neck bush (1) is corresponding with the external diameter blank dimension of roll; Inner surface and the outer surface roughness of neck bush (1) are Ra1.6 ~ Ra3.2; Described neck bush (1) is selected the material identical with cold mould (2);

C, assembling: cold mould (2) adopts hot-mounting process with neck bush (1), first cold mould (2) is carried out to heat temperature raising processing, in the time that cold mould (2) temperature rises to 420 DEG C, neck bush (1) is press-fited to cold mould (2) endoporus;

D, fixing: the cold mould (2) and the neck bush (1) that have assembled are cooled to after normal temperature, fix on the periphery at neck bush (1) external diameter and cold mould (2) internal diameter seam crossing two ends with some junction of the edges of two sheets of paper screws.