CN101280373A - Compression sintering and quenching integrated production process for cemented carbides - Google Patents

Abstract

The invention relates to a pressure sintering and quenching integrated manufacturing process for the hard alloy. The manufacturing process is characterized in that the manufacturing process comprises the process steps that product charge into furnace, vacuum pumping (0.1 to 350Pa), temperature elevation, compression sintering (the temperature is kept at 1350 to 1600DEG C and the product is sintered for 30 to 100 minutes, and the pressure is up to 1 to 10 MPa), cooling down, heat preservation (1000 to 1300 DEG C, for 0 to 100 minutes), decompression (0.10 to 0.65MPa), quenching, cooling down, pressure relief and furnace tapping. The manufacturing process has the advantages that because the two working procedures of pressure sintering and quenching of the hard alloy are integrated into one working procedure and integrated on one device, the equipment investment can be saved on premise that the product quality is not influenced, thus the energy consumption can be reduced by above one time, the production cycle is shortened by above 4.5 times, the production efficiency is improved by above 4.5 times, the production cost is reduced by above one time, the man power is saved by one time, and the worksite is saved by about one time.

Description

A kind of compression sintering and quenching integrated production process for cemented carbides

Technical field

The present invention relates to the hard alloy production process field.

Background technology

The SINTERING TECHNOLOGY of Wimet mainly contains vacuum sintering and pressure sintering, because vacuum sintering is negative pressure state, product is in sintering process, during the weave construction densification, do not have the external world to exert pressure, cause densification incomplete, hole, hole are residual more, thereby fracture origin is more, and the strength of materials is low.And pressure sintering be product in the sintering densification process, the external world exerts pressure, material inside organization structure is finer and close, hole, hole are residual less, thus fracture origin quantity and size all have and reduce largely, the strength of materials obviously improves.Quenching processing technology can be transformed into most of cobalts of material inside organization structure the face-centered cubic lattice of viscous deformation better performances mutually, improves the shock resistance of goods.

Known Wimet pressure sintering processing step is: molded article-dress boat goes in stove-stove to vacuumize (250-650 ℃ of (1-10Pa)-electrically heated intensification-Tuo binder, comprise that vacuum is taken off binder and logical hydrogen takes off the binder dual mode)-(1350-1600 ℃ of pressurization heats up, pressure 2-10MPa is incubated 40-100 minute)-decrease temperature and pressure (12-20 hour)-venting unloads and is depressed into normal pressure-sintered article and comes out of the stove.Pressure sintering technology is metal current and alloy material industry, especially the advanced technologies of cemented carbide industry forefront property.

Known Wimet quenching technology is: the sintering cemented carbide product are packed into and are vacuumized (1-15Pa)-press process curve (2-6 hour)-vacuum hardening insulation (1000-1280 ℃ be incubated 30-100 minute)-cold soon (oil quenching or gas are quenched)-quenching finished product of quenching that heats up in vacuum sintering quenching furnance-stove and come out of the stove.

The sintering and quenching integrated processing step of known hard alloy vacuum is: the non-thermal sintering goods that taken off binder are packed into and are vacuumized (1-15Pa)-electrically heated in vacuum sintering quenching furnance-stove and heat up-(1350-1600 ℃, be incubated 30-100 minute)-cooling (1000-1280 ℃ be incubated 30-100 minute) naturally-feed nitrogen unlatching blower fan or oil quenching carry out fast cold quenching-finished product and come out of the stove.

Because known Wimet pressure sintering and quenching are come by pressure sintering and quenching two procedures branch and are finished, therefore need two covering devices, facility investment is big, and operation is many, and energy consumption is big, and rare gas element consumption is big, and is time-consuming.Though and the sintering and quenching integrated technology of known hard alloy vacuum is a covering device, because this device can only use vacuum sintering, can not pressure sintering, material hole, hole are residual more, thus fracture origin is more, and the strength of materials is low.

Summary of the invention

It is to be come by pressure sintering and quenching two procedures branch to finish that purpose of the present invention is quenched at known Wimet pressure sintering, therefore need two covering devices, facility investment is big, operation is many, and energy consumption is big, and rare gas element consumption is big, time-consuming, though and the vacuum sintering quenching is that a procedure is finished, the deficiency that product strength is low, and the compression sintering and quenching integrated production process for cemented carbides that provides a kind of pressure sintering and quenching one procedure to finish.

Advantage of the present invention is because the pressure sintering and the quenching two procedures of Wimet are merged into a procedure, one covering device, both guaranteed that molded article took off finishing of binder technology, also guaranteed the processing requirement of pressure sintering, simultaneously do not need having guaranteed again again, row vacuumizes intensification, utilize in the stove self existing heat and temperature to carry out quenching and preserving heat, and need not resemble vacuum sintering quench inflated with nitrogen or use machine oil, but directly utilize the argon gas pump circulation heat exchange of pressurizeing in the stove, carry out fast cold quenching.Not influencing under the product quality premise, can save facility investment, cut down the consumption of energy more than 1 times, shorten the production cycle more than 4.5 times, production efficiency improves more than 4.5 times, reduces production costs more than 1 times, saves 1 times of manpower, saves nearly 1 times of place.

Description of drawings:

Accompanying drawing 1 is structural representation of the present invention.

Embodiment

The quenching integrated stove of pressure sintering is formed (see figure 1) by body of heater 1, heat insulating screen 2, pushing mechanism 3, electric heating body 5, ar gas passage 6, ar gas passage 8, vacuum pressure valves 9, vacuum pressure valves 10, Blower Housing 11, blower fan 12, interchanger 13, goods boat support case 14, the warm idol 15 of observing and controlling; Be respectively equipped with body of heater Qianmen 1-1 and stove back door 1-2 in the rear and front end of body of heater 1, heat insulating screen 2 is installed in the body of heater 1, electric heating body 5 is installed in the heat insulating screen 2, goods boat support case 14 is installed in the body of heater 1, be respectively equipped with heat insulating screen Qianmen 2-1 and back door 2-2 in the rear and front end of heat insulating screen 2, pushing mechanism 3 is installed on the body of heater 1, pushing mechanism 3 mainly is made up of a pair of pressure cylinder, the piston push rod of a pair of pressure cylinder links to each other with back door 2-2 with heat insulating screen Qianmen 2-1, blower fan 12 and interchanger 13 (for water cooling heat exchanger) are installed in respectively in the Blower Housing 11, ar gas passage 6 one ends communicate with the air outlet of blower fan 12, the other end communicates with the inner chamber of heat insulating screen 2, ar gas passage 8 one ends communicate with the inner chamber of heat insulating screen 2, the other end communicates with the blast inlet of blower fan 12, vacuum pressure valves 9 and vacuum pressure valves 10 are installed in respectively on ar gas passage 6 and the ar gas passage 8, the warm idol 15 of observing and controlling is installed in the body of heater 1, be provided with multi-purpose interface 1-3 on body of heater 1, multi-purpose interface 1-3 communicates with the inner chamber of body of heater 1.

Concrete processing step:

1, goods are gone into stove: the molded article dress boat that will treat the pressure sintering quenching is put on the goods boat support case of pressure sintering quenching furnance;

2, vacuumize: close forward and backward door of heat insulating screen and stokehold, back door, by multi-purpose interface with in the sintered quenching stove, vacuumize in ar gas passage and the Blower Housing and reach 1-10Pa;

3, heat up: the pressure sintering quenching furnance is heated up with electrically heated;

4, pressure sintering: be warming up to 1350-1600 ℃; At 1350-1600 ℃ of heat preservation sintering 30-100 minute, close vacuum pressure valves before the ventilation pressurization, and feed the rare gas element pressurization in during this temperature, make pressure reach 1-10MPa;

5, cooling, insulation: in 5-80 minute, be cooled to quenching temperature 1000-1300 ℃ naturally, and be incubated 0-100 minute;

6, step-down: drive valve and be depressurized to 0.15-0.65MPa;

7, quench: start blower fan and blow rare gas element pump circulation heat exchange Cooling Quenching 3-20 minute, temperature is reduced to 0-400 ℃;

8, cooling, release, come out of the stove: when temperature is reduced to normal temperature-150 ℃, drive valve and unload and be depressed into normal pressure, product can be come out of the stove.

Claims (1)

1, a kind of compression sintering and quenching integrated production process for cemented carbides is characterized in that its processing step is:

1, goods are gone into stove: molded article is adorned boat put into the quenching integrated stove of pressure sintering;

2, vacuumize: reach vacuumize in the quenching integrated stove of pressure sintering at 0.1-350Pa;

3, heat up: the pressure sintering quenching furnance is heated up with electrically heated;

4, pressure sintering: be warming up to 1350-1600 ℃; At 1350-1600 ℃ of heat preservation sintering 30-100 minute, and feed the rare gas element pressurization in during this temperature, make pressure reach 1-10MPa,

5, cooling, insulation: in 5-80 minute, be cooled to quenching temperature 1000-1300 ℃ naturally, and be incubated 0-100 minute;

6, step-down: drive valve and be depressurized to 0.10-0.65MPa,

7, quench: start blower fan and blow rare gas element pump circulation heat exchange Cooling Quenching 3-20 minute, temperature is reduced to 0-400 ℃;

8, cooling, release, come out of the stove: when temperature is reduced to normal temperature-150 ℃, drive valve and unload and be depressed into normal pressure, product can be come out of the stove.

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