A large gas turbine blade ceramic core sintering cartridge size control device and application method

Abstract

The application discloses a large-sized gas turbine blade ceramic core sintering loading box size control device and an application method, two groups of suspension tools are arranged at the opening of the sagger, the suspension tool comprises a supporting piece and a suspension rod, the supporting piece is supported on the opening end face of the sagger, the suspension rod is connected with the supporting piece through a screw rod, and an adjusting nut is threadedly connected on the screw rod; a screen support is arranged on the top surface of the supporting piece; when filling, the ceramic core is hung on the suspension rod of the suspension tool, the filler is screened through the screen and then filled into the sagger, when the filling position reaches 3 / 4 of the ceramic core, the suspension tool is taken out, the filler is continuously screened through the screen until the ceramic core is completely covered; the suspension tool for the ceramic core sintering loading box and the powder filling screen are simultaneously used, stress is effectively eliminated, size deformation in the ceramic core loading process is avoided, the ceramic core sintering assembly rate is improved, the loading operation of the ceramic core with different size structures is suitable, and efficient and lean production is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ceramic core manufacturing and production, in particular to a large-scale gas turbine blade ceramic core sintering box size control device and application method. BACKGROUND

[0002] With the continuous improvement of the performance of aero-engine and ground gas turbine, the turbine blade at the key position is mostly hollow structure in order to withstand higher temperature and more harsh environment; and the ceramic core is an essential link for forming the complex cavity of the hollow blade. During the sintering process of the ceramic core, whether in the dewaxing stage or in the sintering stage, the ceramic core body is usually buried and sintered by filling the box with fillers. The purpose of burying and sintering is to improve the uniformity and stability of the temperature field distribution around the core body, reduce the surface pressure gradient of the core body, avoid the deformation of the core during dewaxing and sintering, reduce the defects in the sintering process of the core, and improve the sintering yield. The key step of burying and sintering is to fill the box. In order to reduce the impact of sintering on the "twisting" of the structural axis of the ceramic core, the ceramic core green body is buried in the filler of the sintering pot by vertically placing the ceramic core. According to the size and shape of the ceramic core, an appropriate size of the refractory sintering pot is selected, an appropriate amount of filler is filled, then the core is buried in the filler of the sintering pot according to the direction, position and number specified by the process design, and then the filler is continuously added to the sintering pot until the ceramic core is completely covered, and the sintering pot is vibrated to make it full. Put the sintering pot into the sintering furnace for sintering, cool down with the furnace after sintering, and take out the ceramic core.

[0003] The ceramic core of the large-scale gas turbine blade itself has a relatively large size (350-750mm), the blade structure is complex, the exhaust edge is relatively thin (the thinnest is only 1mm), and the wall thickness difference is large. The traditional way is to directly insert the ceramic core into the filler of the sintering pot after completing the core pressing, then directly fill the powder until the ceramic core is completely buried, and then sinter in the furnace. Since the sintering pot has been pre-filled with an appropriate amount of filler, the filler itself has a certain density, and it is difficult for the ceramic core to be inserted smoothly. Secondly, there will inevitably be stress during the insertion of the ceramic core, which will cause the ceramic core to deform in size before sintering, especially the size deformation of the thin ceramic core exhaust edge is particularly obvious. Therefore, the size of the sintered ceramic core is uncontrollable, and a large number of size unqualified situations occur. In addition, since the sintering pot is directly inserted manually, the depth, position and spacing of the insertion cannot be accurately controlled, resulting in uncontrollable size and sintering performance of each ceramic core after sintering, and the sintering stability of the ceramic core product cannot be achieved.

[0004] In view of the above problems, the inventor has developed a ceramic core sintering box size control device and application method based on many test cases and practical experience, which effectively solves the uncontrollable problems such as size deformation of the ceramic core caused by stress during the filling process, and achieves the stability and consistency of the size of the ceramic core wet body before sintering. SUMMARY

[0005] The main purpose of the present application is to provide a large gas turbine blade ceramic core sintering sagger size control device and application method, which can effectively solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a large gas turbine blade ceramic core sintering sagger size control device, comprising a sagger, two groups of suspension tooling are arranged at the opening of the sagger, the suspension tooling comprises a support and a suspension rod, the support is supported on the opening end surface of the sagger and fixed with the sagger through locking pieces at both ends, the suspension rod is connected with the support through a screw rod, and an adjusting nut is threadedly connected on the screw rod; a screen is supported on the top surface of the support.

[0007] Preferably, the two groups of suspension tooling are arranged in parallel.

[0008] Preferably, the support is a square rod with bent portions at both ends, and the bent portions are fixed with the outer side wall of the sagger through locking pieces.

[0009] Preferably, a plurality of suspension grooves are arranged at equal intervals on the suspension rod.

[0010] Preferably, the suspension rod is provided with a scale along the length direction.

[0011] Preferably, the mesh number of the screen is 7-12 mesh.

[0012] An application method of a large gas turbine blade ceramic core sintering sagger size control device, comprising the following steps: after the ceramic core is pressed and formed, the mold is corrected, a small amount of filler is preloaded in the sagger, the suspension tooling is fixed on the opening end surface of the sagger, the suspension rod is adjusted to an appropriate height through the adjusting nut, the ceramic core is hung on the suspension rod, and the distance between the ceramic cores is more than 15mm, the screen is placed on the suspension tooling, the filler is sieved through the screen and then filled into the sagger, when the position of the filler reaches 3 / 4 of the ceramic core, the filling is stopped, the suspension tooling is taken out, the filler is continuously added through the screen until the ceramic core is completely covered, the sagger is slightly vibrated to be filled, it is put into the sintering furnace for sintering, it is cooled in the furnace after sintering is completed, and the ceramic core is taken out.

[0013] Compared with the prior art, the present application has the beneficial effects that: the present application simultaneously uses the suspension tool for sintering the ceramic core and the powder filling screen mesh, and the two work together to effectively eliminate the stress generated during the boxing operation, avoid the size deformation generated during the boxing operation of the ceramic core of the large gas turbine blade, and improve the size qualification rate of the sintered ceramic core and the inner cavity size and wall thickness size qualification rate of the castings; the suspension tool is an adjustable device with simple structure and low cost; it can be widely applied to the boxing operation of ceramic cores with different sizes and structures, effectively controls the consistency and uniformity of the sintering boxing, and makes the ceramic core sintering boxing operation more standardized, scientific and replicable, thereby realizing efficient and lean production. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0015] Figure 2 It is a schematic diagram of the overall structure of the present application;

[0016] Figure 3 It is a schematic diagram of the overall structure of the present application;

[0017] Figure 4 It is a schematic diagram of the overall structure of the present application.

[0018] In the figure: 1, box; 2, support; 201, bending part; 3, suspension rod; 301, suspension groove; 4, locking part; 5, screw; 6, adjusting nut; 7, screen. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0020] Example 1

[0021] As Figures 1-4As shown, a large gas turbine blade ceramic core sintering loading size control device is provided, which comprises a sagger 1, two sets of parallel suspension tooling are arranged at the opening of the sagger 1, the two sets of suspension tooling form a set and are used in cooperation, and the distance and height between the two sets of suspension tooling can be adjusted and can be applied to ceramic cores of different sizes. The suspension tooling comprises a support 2 and a suspension rod 3. The support 2 is a square rod and two ends of the support 2 are provided with bent portions 201. The bent portions 201 are fixed to the outer side wall of the sagger 1 by locking members 4. The locking members 4 are locking bolts. The support 2 is supported on the opening end surface of the sagger 1 and the two ends of the support 2 are fixed to the sagger 1 by the locking members 4. The suspension rod 3 is connected to the support 2 by a screw rod 5. A adjusting nut 6 is threadedly connected to the screw rod 5. The screw rod 5 slides through the support 2 and the adjusting nut 6 is arranged above the support 2. The position of the screw rod 5 is adjusted by rotating the adjusting nut 6, and then the height of the suspension rod 3 is adjusted. A screen 7 is arranged on the top surface of the support 2. The screen 7 can be attached to the top surface of the support 2 through the screw rod 5. The mesh number of the screen 7 is 7-12 mesh. The screen 7 has a buffering effect when the filler is added, so that the filler is more evenly distributed. The impact force of the filler on the ceramic core when the filler is loaded into the sagger 1 is effectively reduced. The fine material cannot leak through the screen hole, and the buffering effect is not obvious when the screen hole is too large.

[0022] In order to standardize the suspension distance of the ceramic core, a scale is arranged on the suspension rod 3 along the length direction, and a plurality of suspension grooves 301 are arranged at equal intervals according to the scale. The distance between adjacent suspension grooves 301 is 15 mm.

[0023] Example 2

[0024] In order to further illustrate the application method of the loading size control device in example 1 and the effect, the following four ceramic core loading implementation cases are compared:

[0025] Implementation case one: using the traditional method, after the ceramic core is pressed and formed, the mold is straightened, and then the ceramic core is directly inserted into the sagger which has been pre-loaded with an appropriate amount of filler, that is, 1 / 3 of the sagger, and the filler is continuously loaded until the ceramic core is completely covered. The sagger is slightly vibrated to make it full. Enter the sintering furnace for sintering, cool down with the furnace after sintering, and take out the ceramic core. Perform size detection. The size of the ceramic core is severely deformed, and the overall size profile is out of tolerance by >0.5 mm, and the size of the relatively thin exhaust edge is out of tolerance by >0.7 mm. The size of the ceramic core is unqualified.

[0026] Case two: After the ceramic core is pressed, the mold is straightened, and the ceramic core is directly inserted into the pre-filled crucible with the appropriate amount of filler, which is 1 / 3 of the crucible. Then the filler is sieved until it completely covers the ceramic core. Vibrate the crucible to fill it. Put it in the sintering furnace for sintering. After sintering, cool it in the furnace and take it out. Check the size. The size of the ceramic core is still severely deformed, with an overall size profile of >0.45mm and a thin exhaust edge of >0.6mm. The ceramic core size is unqualified.

[0027] Case three: After the ceramic core is pressed, the mold is straightened, and a small amount of filler is pre-filled in the crucible, with a thickness of ≥25mm. The suspension tool is fixed on the open end face of the crucible. Adjust the suspension rod to the appropriate height by adjusting the nut. Hang the ceramic core on the suspension rod, with a spacing of more than 15mm between the ceramic cores. After all the ceramic cores are hung, fill directly. Stop filling when the filler position reaches 3 / 4 of the ceramic core. Remove the suspension tool and continue to fill directly until the ceramic core is completely covered. Vibrate the crucible to fill it. Put it in the sintering furnace for sintering. After sintering, cool it in the furnace and take it out. Check the size. The size of the ceramic core is significantly improved, with an overall size profile of ≤0.25mm and a thin exhaust edge of ≤0.3mm. The ceramic core size is basically qualified.

[0028] Case four: After the ceramic core is pressed, the mold is straightened, and a small amount of filler is pre-filled in the crucible, with a thickness of ≥25mm. The suspension tool is fixed on the open end face of the crucible. Adjust the suspension rod to the appropriate height by adjusting the nut. Hang the ceramic core on the suspension rod, with a spacing of more than 15mm between the ceramic cores. Place a sieve on the suspension tool. Fill the filler into the crucible after sieving. Stop filling when the filler position reaches 3 / 4 of the ceramic core. Remove the suspension tool and continue to add filler through the sieve until the ceramic core is completely covered. Vibrate the crucible to fill it. Put it in the sintering furnace for sintering. After sintering, cool it in the furnace and take it out. Check the size. The size of the ceramic core is effectively improved, with an overall size profile of ≤0.20mm and a thin exhaust edge of ≤0.25mm. The size qualification rate reaches the international leading level. The ceramic core size qualification rate reaches more than 95%. The size of the ceramic core sintered with the ceramic core sintering and packing device completely meets the design requirements. The size is effectively controlled, improving the overall qualification rate of the ceramic core and the overall qualification rate of the inner cavity size and wall thickness of the castings.

[0029] After multiple tests and comparison, the scheme of the fourth preferred embodiment is finally selected, which simultaneously uses the suspension tool of the ceramic core sintering cartridge and the powder filling screen mesh, and the two work together to effectively eliminate the stress generated during the cartridge operation process, avoid the dimensional deformation generated during the cartridge operation process of the large gas turbine blade ceramic core, and improve the dimensional qualification rate of the ceramic core after sintering and the qualification rate of the inner cavity size and wall thickness size of the castings; the suspension tool is an adjustable device, which is simple in structure and low in cost; it can be widely applied to the cartridge operation of ceramic cores of different sizes and structures, effectively controls the consistency and uniformity of sintering cartridge, and makes the ceramic core sintering cartridge operation more standardized, scientific and replicable, so as to realize efficient and lean production.

[0030] The foregoing merely illustrates some exemplary embodiments of the present application, and it is needless to say that the described embodiments can be modified in various ways without departing from the spirit and scope of the present application. Therefore, the foregoing drawings and descriptions are illustrative in nature, and should not be construed as limiting the scope of the claims of the present application.

Claims

1. A method of using a large gas turbine vane ceramic core sintering magazine size control device, characterized by: The large-sized gas turbine blade ceramic core sintering box size control device comprises a box, two sets of suspension tools are arranged at the opening of the box, the suspension tool comprises a support and a suspension rod, the support is supported on the opening end surface of the box and is fixed with the box through locking pieces at both ends, the suspension rod is connected with the support through a screw rod, and an adjusting nut is threadedly connected on the screw rod; and a screen is supported on the top surface of the support. The application method comprises the following steps: after the ceramic core is press-formed, the mold is straightened, a small amount of filler is pre-loaded in the box, the suspension tool is fixed on the opening end surface of the box, the suspension rod is adjusted to an appropriate height through the adjusting nut, the ceramic core is hung on the suspension rod, the spacing between the ceramic cores is greater than 15mm, the screen is placed on the suspension tool, the filler is sieved through the screen and then filled into the box, when the position of the filler reaches 3 / 4 of the ceramic core, the filling is stopped, the suspension tool is taken out, the filler is continuously added through the screen until the ceramic core is completely covered, the box is slightly vibrated to make the filler full, the box is put into a sintering furnace for sintering, the ceramic core is taken out after the sintering is completed and the furnace is cooled.

2. A large gas turbine vane ceramic core sintering magazine size control device according to claim 1, characterized in that: The two sets of suspension tools are arranged in parallel.

3. A large gas turbine vane ceramic core sintering magazine size control device according to claim 1, characterized in that: The support is a square rod and is provided with a bent portion at both ends, and the bent portion is fixed with the outer side wall of the box through the locking pieces.

4. A large gas turbine vane ceramic core sintering magazine size control device according to claim 1, characterized in that: A plurality of suspension grooves are arranged on the suspension rod at equal intervals.

5. A large gas turbine vane ceramic core sintering magazine size control device according to claim 4, characterized in that: The suspension rod is provided with a scale along the length direction.

6. A large gas turbine vane ceramic core sintering magazine size control device according to claim 1, characterized in that: The mesh number of the screen is 7-12.

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