CN102069093A - Tungsten carbide roller - Google Patents

Abstract

The invention relates to a tungsten carbide roller. The tungsten carbide roller comprises the following components of: 84.5 to 85.5 percent of WC, 6.8 to 7.5 percent of Co, 6.8 to 7.5 percent of Ni, 0.2 to 0.5 percent of TiC, 0.2 to 0.5 percent of CrC, and 0.1 to 0.3 percent of VC. The mixed raw material powder is molded by an isostatic pressing process, and a roller blank is subjected to vacuum sintering treatment at the temperature of between 1,390 and 1,490 DEG C. Because a mixture of cobalt and nickel elements, titanium carbide, chrome carbide and vanadium carbide of hard alloy phase with extremely good bonding performance is added, the composition of the tungsten carbide roller is improved, and a reasonable internal tissue structure is formed. By reasonably selecting the sintering temperature in the vacuum state, defects of under sintering, over sintering and deformation are avoided, the tungsten carbide roller with good comprehensive performance is obtained, the rolling quantity of single-roll single rolling rings is improved by over two times, workload and expenditure of roller replacement are reduced, the work efficiency of the roller is improved, and the quality of wire products is ensured.

Description

A kind of tungsten carbide roll

Technical field

The invention belongs to the steel rolling equipment field, the tungsten carbide roll that particularly a kind of high-speed rod-rolling mill is used with good organization's structure and comprehensive serviceability.

Background technology

Roll is the crucial utensil that makes rolled piece produce plastic deformation and obtain desirable design shape, and the wearability of roll directly influences the surface quality of wire product and the production operational availability of milling train.Therefore, the high-speed rod-rolling mill of China's introduction in recent years especially employed roll of finishing mill is the tungsten carbide roll of import mostly, not only need a large amount of foreign exchange of cost every year, and the price of every roll is all very expensive, has increased production cost virtually.And tungsten carbide roll is later in the time of China's exploitation, the production technology of roll manufacturer is backward relatively, the surface quality and the inherent quality of institute's production roll are all relatively poor, tissue looseness causes roll to wear no resistance, serious wear and roller crushing rate height, the amount of rolling of single roller and single groove is less, is difficult to satisfy the instructions for use of high-speed wire rolling.On the other hand, the high-speed rod production development is swift and violent, and not only speed is more and more higher, the specification required precision is more and more tighter, kind is more and more simultaneously, and the intensity and the hardness of product are also more and more higher, influence the main bottleneck of product yield and operating rate of rolling mill thereby roll quality has been become.

In addition, the root two generations high speed water horizontal line material mm finishing mill unit of rubbing that introduce domestic last century, owing to lack fixed, tube reducing equipment, the tungsten carbide roll of rolling mill is being born the dual function of amount of plastic deformation and control product specification size before finished product and the finished product, in order to adapt to the high speed development of wire product, the wearability and the cracking resistance of the tungsten carbide roll of rolling mill before finished product and the finished product are had higher requirement.Simple only the tackling key problems of producer of domestic production tungsten carbide roll at present from forming technology, the isostatic pressure aspect of roll, and seldom study from aspects such as the working condition of tungsten carbide roll and chemical compositions, therefore can't fundamentally solve the serviceability problem of tungsten carbide roll always.External tungsten carbide roll manufacturer takes secret control measure to chemical composition, proportioning and main sintering, the moulding process of the tungsten carbide roll of its production again, thereby makes the combination property that how to improve tungsten carbide roll become a difficult problem that needs to be resolved hurrily.

Summary of the invention

Purpose of the present invention is exactly at above-mentioned defective, aims to provide a kind of passing through and adds trace element, improves the inherent institutional framework of roll, takes high-temperature vacuum sintering processes technology, obtains the high-speed rod tungsten carbide roll with good combination property.For this reason, the technical solution that the present invention taked is:

A kind of tungsten carbide roll comprises the main component tungsten carbide, also contains bonding element cobalt and nickel, micro-titanium carbide, chromium carbide and vanadium carbide.Each composition weight percent content is:

WC?84.5～85.5％、Co?6.8～7.5％、Ni?6.8～7.5％、TiC?0.2～0.5％、CrC?0.2～0.5％、VC?0.1～0.3％。

The material powder of mentioned component and content is adopted conventional isostatic pressing process moulding, and the roller stock after the roughing carries out the high-temperature vacuum sintering processes in 1390 ℃～1490 ℃ temperature ranges.

Because the present invention is being on the basis of primary raw material with the tungsten carbide, the element cobalt and the nickel that have not only added carbide alloy phase with fabulous adhesive property, and be added with the mixture of titanium carbide, chromium carbide and vanadium carbide, thereby the raw material that has improved tungsten carbide roll is formed and composition proportion, makes it possess the internal condition of the internal organizational structure formation of satisfying the serviceability needs.Simultaneously, fully taking into account roll belongs to and contains the higher middle coarse granule alloy of cobalt amount, and inside and outside footpath size is bigger, and little character and the profile characteristics of height (thickness) size, eutectic temperature according to production practices and carbide alloy and main carbide and binding metal, the sintering temperature of choose reasonable under vacuum state avoided defectives such as underburnt, burning and distortion, finally obtains the tungsten carbide roll of good internal organizational structure and required physical and mechanical properties.Being applied in the water quality pH value is lower than under the condition of 32 ℃ of cooling waters for alkalescence, water temperature, can improve the amount of rolling of roll list groove single high-carbon steel greatly, compare with the tungsten carbide roll that the same industry is used, the amount of rolling of collars can be enhanced about more than once, and the amount of rolling of its flexible cord will be higher.And the roll wear amount is little, the not broken roller of smooth surface, and life cycle is long, the roll change number of times is few, has not only reduced the roll change workload, has reduced expenses, and improved operating rate of rolling mill and product yield, guaranteed the inherent quality and the surface quality of institute's production line section product.Be suitable for rolling rigid line, especially the wire rod of high-level steel such as cord steel.

The specific embodiment

The present invention's tungsten carbide roll mainly is made up of tungsten carbide, cobalt, nickel, titanium carbide, chromium carbide and vanadium carbide.Its weight percent content is:

WC?84.5～85.5％、Co?6.8～7.5％、Ni?6.8～7.5％、TiC?0.2～0.5％、CrC?0.2～0.5％、VC?0.1～0.3％。By the proportioning of choose reasonable roll component and each composition, improve the inherence of roll and form and institutional framework; Adopt high-sintering process simultaneously, will adopt conventional isostatic pressing process moulding in 1390 ℃～1490 ℃ temperature ranges, to carry out the high-temperature vacuum sintering processes, thereby obtain the good tungsten carbide roll of combination property through the roller stock after the roughing.

Embodiment 1:

The material powder that will contain WC 84.5%, Co 6.9%, Ni 7.5%, TiC 0.5%, CrC 0.4%, VC 0.2% according to common process mix, adorn mould and etc. static pressure be processed into base, and its turning is processed into the roller stock of required size.Then roller stock is placed in the vacuum drying oven, under 1490 ℃ of conditions, be incubated 80min, carry out the high-temperature vacuum sintering processes.At last, again the roll behind the sintering is carried out one by one the ultrasonic wave lossless detection and be finish-machined to required specification.

Embodiment 2:

The material powder that will contain WC 85.2%, Co 7.0%, Ni 6.8%, TiC 0.2%, CrC 0.5%, VC 0.3% through conventional technology mix, adorn mould and etc. after static pressure is processed into base, the roller stock of required size is processed in turning.Then the roller stock after the turning is incubated 80min in 1490 ℃ of vacuum drying ovens, carries out the high-temperature vacuum sintering processes.At last the roller stock behind the sintering is carried out the ultrasonic wave lossless detection one by one, qualified roller stock is through being finish-machined to the polishing roll of required specification.

Claims (1)

1. a tungsten carbide roll is characterized in that, comprises main component tungsten carbide, bonding element cobalt and nickel, micro-titanium carbide, chromium carbide and vanadium carbide; Each composition weight percent content is:

WC?84.5～85.5％、Co?6.8～7.5％、Ni?6.8～7.5％、TiC?0.2～0.5％、CrC?0.2～0.5％、VC?0.1～0.3％；

The material powder of mentioned component and content is adopted conventional isostatic pressing process moulding, and the roller stock after the roughing carries out the high-temperature vacuum sintering processes in 1390 ℃～1490 ℃ temperature ranges.