CN101294263A - Large piece weight molybdenum, tungsten, titanium stick and wire coil blank - Google Patents

Abstract

The invention relates to a large unit heavy molybdenum, tungsten and titanium bar and a wire coil proximate matter, and adopts the manufacture method that heavy ingot cogging is adopted, on-line continuous heating and rolling is adopted without stop during the machining process, and long wire drawing is adopted during the finish rolling process. The invention mainly comprises an automatic bar material feeding machine, a medium-frequency induction sintering bar heating furnace, a feed adding mechanism, a three-roll Y type 10 stand roughing mill group, a tube-type conveying mechanism, an on-line three section superaudio induction heating furnace, a three-roll Y type 12 stand finishing mill group, the tube-type conveying mechanism, a recoiling machine, and an electronic control and fume extraction system. The large unit heavy molybdenum, tungsten and titanium bar and the wire coil proximate matter are the important raw material in the electric light source industry, the automotive industry, the glass industry and the machinery manufacturing industry.

Description

Large piece weight molybdenum, tungsten, titanium rod and wire coil blank

Technical field

The stress metal processing and manufacturing

Background technology

Molybdenum, tungsten bar, wire rod are the important raw and processed materials of electric light source, automotive industry, glass industry and machinofacture.Home and overseas is now the highest, and to produce substance be product about 12 kilograms, and by product metallographic structure figure as can be seen quality product can not reach desirable requirement, so far, the technology of producing molybdenum, tungsten and titanium rod, wire rod both at home and abroad mainly adopt swage-stretch or rolling-two kinds of making methods stretch.

Swaging-stretching is traditional molybdenum, tungsten and titanium rod, wire production method.This method: equipment used is simple, less investment, but owing to be subjected to the restriction of rotary swaging machine performance and operation, generally can only process the little sintered blank bar of about 1 kilogram of substance; Because the processing of swaging is to disperse forging fast repeatedly by forging hammer, and pass deformation is little, and distortion is difficult for deeply, texturing temperature is inconsistent, causes the weave construction of processing material inhomogeneous, easily produces surface crack and subsurface defect again; Also little just because of every fiery deflection, need heating for multiple times and repeatedly swage, the energy consumption height, production efficiency is low, and noise, vibration are big, and labor strength is big.For the base that strengthens molybdenum, tungsten and titanium rod, wire rod is heavy, satisfying the needs of user to the product substance, indivedual enterprises also have the line base after many swaged to weld together, and behind the drawn growth line, use for the user.

In order to improve the production efficiency of tungsten and titanium rod, wire rod effectively, enlarge range of product, strengthen product substance, reduce production costs, improve the quality of products, developed country shuts out precision height, performance homogeneous, the great molybdenum wire bar of dish in the use continuous wire mill of later stage nineteen fifties success.

Domestic tungsten and molybdenum material factory mostly is the seventies starting, also has many factories still to continue to use the technology and the equipment in five sixties so far.At present, molybdenum, tungsten and titanium rod, wire production mostly adopt traditional swaging-drawing process, technology is outmoded, equipment is low, about 1 ~ 2 kilogram of product substance, manual feeding labour intensity are big, production efficiency is low, range of product few, of poor quality (grain fineness number sees figure a and figure b for details, and figure a is horizontal metallographic structure, and figure b is vertical metallographic structure).

China brings into use open-train mill to shuttle back and forth through multi-pass in nineteen seventies rollingly to shut out that dish weighs about 5 kilograms, molybdenum wire bar that diameter is the 7.5-14 millimeter.This rolling mill structure is simple, less investment, the wire surface that shuts out is smooth evenly, subsurface defect is few, but owing to roll low, the rolled piece temperature drop of speed and head and tail temperature difference is big, distortion is inhomogeneous, cause rolled piece low precision, performance heterogeneity, burning is serious, loss is big, in rolling easily low, the dish of " straight on the head ", lumber recovery weigh restricted, operator are many, labour intensity is big, environmental pollution is heavier.Also have the double two high rolling mill of employing to produce molybdenum wire, though dish heavy increase, rolled piece temperature drop to some extent reduce to some extent, rolled piece precision, performance and lumber recovery slightly improve, and overall objective does not have radical change.

Twentieth century 80 and the nineties, domestic priority is from the three-roller Y shaped wire tandem rolling machine of German KOCKS company's introduction 250 millimeter eight frame of two Φ, adopt twice heating, the rolling mode of frame of changing planes for twice, the tungsten of 17 millimeters of Φ or molybdenum wire bar are rolled into inscribed circle diameter earlier be about 12 millimeters and be cooled to normal temperature, heating rolling becomes 5.8 millimeters sexangle wire rod in batch again.Good, the performance homogeneous of this mode rolled piece precision, but when being used for rolling aluminum steel since the molybdenum filament process furnace must water supply in 24 hours, power supply, air feed, the energy consumption that seems is big, production efficiency and lumber recovery are on the low side; Sexangle base bar directly batches the fracture of easy generation bight, and vertical bar formula placement floor space is big, and the difficulty of gathering dust is polluted the workshop; Stocking is subjected to the restriction of second-heating furnace length simultaneously, and substance is generally less than 10 kilograms.

1996 in order to provide the molybdenum wire base for 250 millimeter three roller of Φ, the 8 frame Y profile and wire continuous mills of introducing.The 370 millimeters three-roller Y shaped wire tandem rolling machines of Φ of developing of Luoyang Nonferrous Metal Processing Design Inst.'s success, the rolling molybdenum wire base that becomes 17 millimeters of Φ of 53 millimeters sintering molybdenums of heating back Φ bar can be solved is that 250 millimeter three roller of Φ, 8 frame continuous mills are for the base problem.We improved finish-rolling process in 2003, supply with 250 millimeter three roller of Φ, 8 frame Y profile and wire continuous mills and directly roll out 6 millimeters lines of Φ in the molybdenum filament process furnace after 40 minutes heating, and the product bar that this production line is produced weighs 12 kilograms molybdenum wire bar.But substance and quality product are unsatisfactory.

Summary of the invention

Little in order to solve molybdenum, tungsten, titanium rod and wire coil blank substance that existing market produces, the deficiency that waits of poor quality, the present invention has finally adopted the production of big ingot cogging, on-line continuous heating and rolling, long line drawing and has obtained product, realizes the molybdenum wire volume of product deep bid weight, high precision, smooth surface, performance homogeneous.

The technical solution adopted for the present invention to solve the technical problems is: molybdenum, tungsten belong to refractory metal, the fusing point height, density is big, texturing temperature is high, electrical and thermal conductivity is good, temperature drop is fast, resistance to deformation is big, and descend with temperature and sharply to raise, mould-crisp transition temperature constantly descends with the increase of distortion degree and characteristics such as at high temperature easily air-breathing, easy oxidation.

The sintering molybdenum bar base of 50 * 1300 millimeters of Φ will be hot-rolled down to Φ 5.8-6 millimeter molybdenum wire dish about 2 minutes, section shrinkage rate needs just can finish through twenties rolling passes up to 98%.Too fast according to high temperature molybdenum and molybdenum alloy temperature drop, and be convenient to the control of rolled piece section form in the pass and the adjustment and the maintenance of milling train, originally determine and implement the segmentation tandem rolling, that is: rolled piece is in proper order by former and later two tandem rolling units: roughing unit and finishing train, and to obtain the molybdenum wire of required specification.

For guarantee that rolled piece is rolled under the rolling temperature of necessity, this research is provided with a Medium Frequency Induction Heating Furnace heat-agglomerating rod base before the roughing unit; One group of online quick secondary induction heater is set between two tandem rolling units, make full use of surplus temperature heating after the roughing to finish, rolled piece is heated rapidly to is fit in the hot rolled temperature range, continue to be rolled down to delivery gauge, (grain fineness number of 5.2 millimeters goods of this research success back Φ sees figure c and figure d for details to make crystal grain avoid producing grain growth because of heat-up time is long in post bake process, figure c is horizontal metallographic structure, and figure d is vertical metallographic structure).

For line bar one-tenth dish and minimizing stocking oxidation and the workshop pollution of guaranteeing to shut out, carry rolled piece to adopt sealed protection of tubing and dust collecting system in the machine row, be provided with at machine row afterbody and be with the dust collection cover reeling machine.

The invention has the beneficial effects as follows: molybdenum, tungsten, titanium rod and the wire coil blank product of big substance, high quality (inside metallographic is tight) have improved production efficiency and quality product greatly.The application again of molybdenum, tungsten, titanium rod and wire coil blank is expanded.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

Fig. 1 is the mechanical test report of the 725 institute

Fig. 2 is the metallurgical analysis trial report

Fig. 3 is an invention production process synoptic diagram

The equipment of this research consists of: excellent base automatic charging machine, Medium frequency induction sintering furnace for heating billet, material loading add and send mechanism, three Roller Y type 10 frame roughing units, tubular type feed mechanism, online three sections superaudio induction heaters, three-roller Y shaped 12 frame essences Milling train group, tubular type feed mechanism, coiling machine, automatically controlled and smog recovery system, the machine of seeing for details lists intention.

Embodiment

By the sintering molybdenum bar base of base rod feed mechanism with 25 kilograms of 50 ~ 53 * 1300 millimeters net weight of Φ, be placed into the stokehold charging ram before, push induction heater (electric current is not zero when having material in the stove); Can place two excellent bases in the stove,, can release one (each molybdenum base rod heat-up time be 6 minutes) in per 3 minutes through photoelectric thermometer feedback control material temperature; Molybdenum bar base after will being heated by pinch mechanism before the machine is pulled out from fire door with the speed of 0.15 ~ 0.25 meter per second clock, and it is rolling to send roughing mill rapidly to, and the roughing start rolling temperature is 1400-1500 ℃; After 10 passages of process 370 millimeters three-roller Y shaped thick continuous mills of Φ are rolling, roll into and be of a size of 16.2 millimeters sexangles of inscribed circle diameter or circle line bar, temperature is reduced to 1150-1200 ℃.The 50MPa of its resistance to deformation during also by open rolling increases to 220MPa, and the maximum elongation coefficient also drops to 7～8% from 60%.If process with 25% passage elongation continuation again, because the recrystallize that can't recover of rolling pressure and brittle increase and Deformation structure makes the continuation difficult processing to carry out.

Can't carry out this problem of tandem rolling for solving the Yin Wendu reduction, we propose to set up online second heating apparatus after thick Mill Exit, make the rolled piece temperature be increased to 1300-1400 ℃, and stretch coefficient is increased to 55～60%; For making second-heating speed and finishing mill speeds match, online second heating apparatus has adopted three sections ultrasonic frequency induction heater heat protocol, uneven for preventing inside and outside the too fast easy generation of material rate of heating, set up the soaking pit soaking again between per two sections, to guarantee that rolled piece can be with the speed that is complementary with the three-roller Y shaped molybdenum wire continuous mill of 265 millimeter 12 frame of Φ, as the feeding speed of 0.15 ~ 0.25 meter per second clock, evenly be warmed up to about 1370 ℃.

Roughing mill finish to gauge speed is about 2m/s, can't be complementary with secondary heating furnace and finishing mill inlet velocity, and we adopt clamping and conveying device behind the machine that directly enters after the roughing mill outlet, is anti-oxidation distillation and pollutes, and clamping and conveying device is for being interrupted the stainless steel pipes formula.After finishing mill is rolled down to certain inscribed circle diameter, progressively advises through 3 frames and to justify into 5.8 millimeters of Φ.

The material temperature of finish rolling during to 5.8 millimeters of Φ is still about 1000 ℃, can cause product surface oxidation distillation rapidly, serious environment pollution, this research adopts stainless steel tube to make transport pipe between milling train and reeling machine, make that the line base is online under sealing anoxybiotic condition to be cooled to 700 ~ 800 ℃, and under the semitight state, coil into the dish circle of 1800 millimeters of Φ.

Various if desired diameter work in-process are as 25 millimeters of Φ, 20 millimeters of Φ ... the rule circular knitting machine frame that 10 millimeters of Φ or the like, this production line only need the preceding two or three road frame near the goods diameter to be changed into this research can meet the demands.

Consider titanium base and 3 kilograms of possibilities that the sintered tungsten base is rolling simultaneously during the design of this machine row, increased the water cooling system of discharge system, oiling system, equipment and finished product that the middle discharging of blank is arranged etc. in the equipment.

Absolute spread during the titanium metal hot rolling is bigger, and flat triangle pass schedule more is adapted to rolling titanium or titanium alloy material, and rule circles technology has also satisfied and batches and back road tensile requirement at last.Just the hot rolling cogging temperature according to composition different heating to 820 ~ 1010 ℃.Finished product is rolled into the dish circle.

For the sintering tungsten strip hot rolling of 17 millimeters of 3 kilogram weight Φ, the base bar in process furnace internal heating to 1600 ~ 1700 ℃, is directly rolled 5.8 millimeters of Φ by the three-roller Y shaped molybdenum wire continuous mill of 265 millimeter 12 frame of Φ, fall on the blanking frame getting final product.

Claims (4)

1, a kind of large piece weight molybdenum, tungsten, titanium rod and wire coil blank, it is characterized in that: adopt online type of heating, make waste heat after goods utilize hot-work, in the goods operational process, be heated rapidly to the temperature that can continue to process and continue processing, cut down the consumption of energy and reduce the thick phenomenon of crystal grain that is produced because of in goods roughing postcooling and second-heating to reach, improve yield rate and metal income rate.

2, a kind of large piece weight molybdenum according to claim 1, tungsten, titanium rod and wire coil blank, it is characterized in that: adopt three-roller Y shaped milling train to adopt flat triangle, oblique triangle etc., to the last three passages or two passages, even a time rule circle is so that in the pass designing technique of wire reel-up.

3, a kind of large piece weight molybdenum according to claim 1, tungsten, titanium rod and wire coil blank is characterized in that: adopt flow process sealing measure, to reduce temperature drop, scaling loss and oxidation, reach the assurance rolling temperature, reduce metal loss and reduce the purpose of polluting.

4, a kind of large piece weight molybdenum according to claim 1, tungsten, titanium rod and wire coil blank is characterized in that: the big and final product quality height (inside metallographic is tight) of substance.

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