Summary of the invention
The problem to be solved in the present invention provides a kind of lightweight gas turbine with the nearly clean shape casting method of thin brilliant block cast turbine.Adopt the turbine of this method casting, can satisfy the resistance to elevated temperatures requirement of turbine, improve low cycle fatigue property, prolong the service life of turbine.
For addressing the above problem, take following technical scheme:
Lightweight gas turbine of the present invention is to may further comprise the steps successively with the near clean shape casting method characteristics of thin brilliant block cast turbine:
Make wax-pattern earlier
Utilize mould under the pressure of 43 ~ 48 temperature of spending, 0.03 ~ 0.05Mpa, to suppress wax impeller processed;
Carry out the wax-pattern assembly welding again
Dead head and wax impeller processed are welded together, obtain module;
Afterwards, make formwork
Be coated with the extension refractory material on the module surface, form formwork on the surface;
Afterwards, dewax
Be that the steam of 95 ~ 105 degree are heated to formwork with temperature, make the wax material in the formwork melt fully, deviate from, obtain formwork;
Afterwards, carry out roasting
Formwork is put into the roaster that temperature is 940 ~ 960 degree, kept 1.8 ~ 2.2 hours;
Afterwards, cast
Arrange in vacuum furnace in 80 ~ 120 rev/mins the whirling vibration platform, it is on the adjustable whirling vibration platform of 95 ~ 105 rev/mins rotating speed that baked formwork is fixed on rotating speed, is that 1570 ~ 1590 molten metal injects in the formwork with temperature; Afterwards, make that the whirling vibration platform is forward and reverse alternately to be rotated for 3 ~ 5 seconds;
Afterwards, the formwork that is cast with molten metal is carried out taking out during to the dead head surface skining with the stove cooling;
Afterwards, remove formwork and remove the sand grains of cast(ing) surface;
Afterwards, cut dead head, obtain lightweight gas turbine block cast turbine.
Described refractory material is to be mixed together form slurry with 325 purpose zirconium English powder and Ludox, and after module put into described slurry and make it be coated with full slurry and take out, and spills zircon sand again and forms.
Take such scheme, have the following advantages:
By such scheme as can be seen, be on 80 ~ 120 rev/mins the whirling vibration platform because formwork is fixed on rotating speed, after the molten metal that with temperature is 1570 ~ 1590 injects formwork, make that the whirling vibration platform is forward and reverse alternately to be rotated for 3 ~ 5 seconds.Like this, under the vibration operating mode, cast, branch crystal grain is ruptured because of rotation, make that core increases, grain refinement, make that the crystal grain difference of the blade water the turbine foundry goods that casts out and core wheel is less and thinner, its high-temperature behavior and low cycle fatigue property improve, and prolong service life.
The specific embodiment
Be described in further details below in conjunction with the present invention of embodiment.
Embodiment one
Make wax-pattern earlier.Utilize mould under the pressure of 43 temperature of spending, 0.04Mpa, to suppress wax impeller processed.
Carry out the wax-pattern assembly welding again.Dead head and wax impeller processed are welded together, obtain module.
Afterwards, make formwork.Be coated with the extension refractory material on the module surface that combines, form formwork on the module surface.Described refractory material is to be mixed together form slurry with 325 purpose zirconium English powder and Ludox, and after module put into described slurry and make it be coated with full slurry and take out, and spills zircon sand again and forms.
Afterwards, dewax.Be that 100 degrees centigrade steam is heated to formwork with temperature, make module fusing in the formwork, deviate from, obtain formwork.
Afterwards, carry out roasting.Formwork is put into the roaster that temperature is 960 degree, kept 1.8 hours.
Afterwards, cast.Arrange in vacuum furnace in 120 rev/mins the whirling vibration platform, it is on 120 rev/mins the whirling vibration platform that baked formwork is fixed on rotating speed, is that 1570 molten metal injects in the formwork with temperature.Afterwards, make that the whirling vibration platform is forward and reverse alternately to be rotated for 4 seconds.
Afterwards, the formwork that is cast with molten metal is carried out taking out during to the dead head surface skining with the stove cooling.
Afterwards, remove formwork and remove the sand grains of cast(ing) surface.
Afterwards, cut dead head, obtain lightweight gas turbine with thin brilliant block cast turbine.
Embodiment two
Make wax-pattern earlier.Utilize mould under the pressure of 45 temperature of spending, 0.03Mpa, to suppress wax impeller processed.
Carry out the wax-pattern assembly welding again.Dead head and wax impeller processed are welded together, obtain module.
Afterwards, make formwork.Be coated with the extension refractory material on the module surface that combines, form formwork on the module surface.Described refractory material is to be mixed together form slurry with 325 purpose zirconium English powder and Ludox, and after module put into described slurry and make it be coated with full slurry and take out, and spills zircon sand again and forms.
Afterwards, dewax.Be that 105 degrees centigrade steam is heated to formwork with temperature, make module fusing in the formwork, deviate from, obtain formwork.
Afterwards, carry out roasting.Formwork is put into the roaster that temperature is 950 degree, kept 2.0 hours.
Afterwards, cast.Arrange in vacuum furnace in 80 rev/mins the whirling vibration platform, it is on 80 rev/mins the whirling vibration platform that baked formwork is fixed on rotating speed, is that 1580 molten metal injects in the formwork with temperature.Afterwards, make that the whirling vibration platform is forward and reverse alternately to be rotated for 5 seconds.
Afterwards, the formwork that is cast with molten metal is carried out taking out during to the dead head surface skining with the stove cooling.
Afterwards, remove formwork and remove the sand grains of cast(ing) surface.
Afterwards, cut dead head, obtain lightweight gas turbine with thin brilliant block cast turbine.
Embodiment three
Make wax-pattern earlier.Utilize mould under the pressure of 48 temperature of spending, 0.05Mpa, to suppress wax impeller processed.
Carry out the wax-pattern assembly welding again.Dead head and wax impeller processed are welded together, obtain module.
Afterwards, make formwork.Be coated with the extension refractory material on the module surface that combines, form formwork on the module surface.Described refractory material is to be mixed together form slurry with 325 purpose zirconium English powder and Ludox, and after module put into described slurry and make it be coated with full slurry and take out, and spills zircon sand again and forms.
Afterwards, dewax.Be that 95 degrees centigrade steam is heated to formwork with temperature, make module fusing in the formwork, deviate from, obtain formwork.
Afterwards, carry out roasting.Formwork is put into the roaster that temperature is 950 degree, kept 2.2 hours.
Afterwards, cast.Arrange in vacuum furnace in 100 rev/mins the whirling vibration platform, it is on 100 rev/mins the whirling vibration platform that baked formwork is fixed on rotating speed, is that 1590 molten metal injects in the formwork with temperature.Afterwards, make that the whirling vibration platform is forward and reverse alternately to be rotated for 3 seconds.
Afterwards, the formwork that is cast with molten metal is carried out taking out during to the dead head surface skining with the stove cooling.
Afterwards, remove formwork and remove the sand grains of cast(ing) surface.
Afterwards, cut dead head, obtain lightweight gas turbine with thin brilliant block cast turbine.