A pouring investment mold for a vane ring casting

Abstract

The present invention discloses a pouring investment mold for a vane ring casting, which includes a casting, a pouring cup, a runner, riser 1, riser 2, gate 1, gate 2, gate 3, gate 4, gate 5, and gate 6. The casting includes an outer ring, an inner ring, and vanes. Gate 1 connects the upper and lower mounting edges of the outer ring. Gate 2 and auxiliary gate 3 fill and feed the upper mounting edge of the outer ring, the outer ring, the lower mounting edge of the outer ring, and the vanes through gate 1. Gate 4 connects the upper and lower mounting edges of the inner ring. Gate 5 and auxiliary gate 6 fill and feed the upper mounting edge of the inner ring, the inner ring, the lower mounting edge of the inner ring, and the vanes through gate 4. Risers 1 and 2 are connected to the upper runner, and the runner is connected to the pouring cup. The runners are evenly distributed along the vane ring. The present invention can effectively reduce defects such as porosity and cracks in high-temperature alloy vane ring castings, and significantly improve the qualified rate of castings. Compared with the traditional scheme, the weight of the gating system is reduced by more than 30%, effectively improving the process yield.

Description

Technical Field

[0001] The invention relates to the technical field of investment casting, in particular to a casting investment mold for blade ring castings. Background Art

[0002] Blade ring castings refer to annular castings with inner and outer rings and multiple blades. They are commonly used in aircraft engines or gas turbines and are mostly cast from high-temperature alloys. This type of casting is difficult to cast because of its compact and complex structure, and has the characteristics of very thin thin walls and very thick thick walls. Among them, the upper and lower mounting edges of castings such as the pre-swirl nozzle and the inner ring of the guide vane are relatively thick and large, and due to the small axial height, the distance between the upper and lower mounting edges is very close, with a very narrow "annular groove", and the thin walls of the inner and outer rings between the mounting edges clamp the blades; for this type of casting, the traditional process is to install annular risers on the upper and lower mounting edges of the inner and outer rings, or to use annular runners to connect the upper and lower mounting edges of the inner and outer rings with multiple internal gates for bottom pouring, top pouring or side pouring. The disadvantage of this method is that there are many risers and runners; since the distance between the upper and lower mounting edges is very small, the annular pouring system and the casting shell are wrapped together to form a structure with a narrow internal space, which is not conducive to heat dissipation, resulting in loose castings, shrinkage cracks, and cracks on the blades between the two rings due to the shrinkage stress of many thick runners. Therefore, the casting qualification rate is very low, which becomes a bottleneck in production. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a casting mold for blade ring castings, which mainly aims at the problem of extremely low casting qualification rate of blade ring castings such as pre-rotating nozzles due to looseness and crack defects. The simplified structure of T-shaped inner gate composite shrinkage feeding riser replaces the shrinkage feeding process of multi-layer thick large annular casting riser, which realizes the needs of casting filling and shrinkage feeding, and avoids the casting system hindering the heat dissipation of the casting.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A casting mold for a blade ring casting includes a casting, a pouring cup, a cross runner, a riser 1, a riser 2, a gate 1, a gate 2, a gate 3, a gate 4, a gate 5, and a gate 6. The casting includes an outer ring, an inner ring, and blades. The gate 1 connects the upper and lower mounting edges of the outer ring, and the gate 2 assists the gate 3 to fill and compensate for the upper mounting edge of the outer ring, the outer ring, the lower mounting edge of the outer ring, and the blades through a pair of gates. The gate 4 connects the upper and lower mounting edges of the inner ring, and the gate 5 assists the gate 6 to fill and compensate for the upper mounting edge of the inner ring, the inner ring, the lower mounting edge of the inner ring, and the blades through a pair of gates. The riser 1 and the riser 2 are connected to the upper cross runner, and the cross runner is connected to the pouring cup, and the cross runners are evenly distributed along the blade ring.

[0006] The width of the first gate is not greater than that of the third gate, and its thickness does not exceed the mounting edge on the outer ring. The first gate is aligned with the third gate directly above it, and the other dimensions are coordinated with the outer ring surface and the upper and lower mounting edges.

[0007] The center line of the second gate is aligned with the center line of the third gate. The second gate is wider at the top and narrower at the bottom, wider outside and narrower inside, larger at the top and smaller at the bottom. Its inner side is in contact with the third gate, the mounting edge on the outer ring, and the first gate. Its upper end is flush with the third gate. Its outer side is an arc surface or an inclined surface. Its width is less than that of the third gate, but not less than one-fourth of the width of the third gate. The contact part between the second gate and the third gate is tangent to its inclined surface.

[0008] The cross-section of the third gate is a right trapezoid, with the inclined line on the outside, the inclined angle being 15° - 40°, the right angle towards the axis of the casting. Both the inner and outer surfaces are designed as arcs along the mounting edge of the casting. The bottom width is the same as the thickness of the mounting edge of the casting, the height is 20 mm - 50 mm, and the chord length of the arc is 25 mm - 50 mm.

[0009] The width of the fourth gate is not greater than that of the sixth gate, and its thickness does not exceed the mounting edge on the inner ring. The fourth gate is aligned with the sixth gate directly above it, and the other dimensions are coordinated with the inner ring surface and the upper and lower mounting edges.

[0010] The center line of the fifth gate is aligned with the center line of the sixth gate. The fifth gate is wider at the top and narrower at the bottom, wider outside and narrower inside, larger at the top and smaller at the bottom. Its inner side is in contact with the sixth gate, the mounting edge on the inner ring, and the fourth gate. Its upper end is flush with the sixth gate. Its outer side is an arc surface or an inclined surface. Its width is less than that of the sixth gate, but not less than one-fourth of the width of the sixth gate. The contact part between the fifth gate and the sixth gate is tangent to its inclined surface.

[0011] The cross-section of the sixth gate is a right trapezoid, with the inclined line on the outside, the inclined angle being 15° - 40°, the right angle away from the axis of the casting. Both the inner and outer surfaces are designed as arcs along the mounting edge of the casting. The bottom width is the same as the thickness of the upper mounting edge of the casting, the height is 20 mm - 50 mm, and the chord length of the arc is 25 mm - 50 mm.

[0012] The outer contour dimensions of the first riser and the second riser are larger than the dimensions of the lower gates. Their inner sides are aligned with the inner arc surfaces of the lower gates. The first riser and the second riser are connected to the upper cross-riser above, and the cross-riser is connected to the pouring cup.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The present invention can effectively reduce defects such as porosity and cracks in high-temperature alloy blade ring castings, and significantly improve the qualified rate of castings. Compared with the traditional scheme, the weight of the gating and risering system is reduced by more than 30%, effectively improving the process yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the pouring investment structure of a blade ring casting of the present invention.

[0016] Among them, 1 - Gate 1, 2 - Gate 2, 3 - Gate 3, 4 - Gate 4, 5 - Gate 5, 6 - Gate 6, 7 - Riser 1, 8 - Risers 2, 9 - Runner, 10 - Sprue Cup, 11 - Casting. Specific Embodiment

[0017] To solve the problems existing in the prior art, such as Figure 1 As shown, the present invention provides a gating investment casting for a vane ring casting, including Gate 1, Gate 2, Gate 3, Gate 4, Gate 5, Gate 6, Risers 1, Risers 2, Runner, Sprue Cup, and Casting 11. The casting 11 includes an outer ring, an inner ring, and blades. Gate 1 connects the upper and lower mounting edges of the outer ring. Gate 2 assists Gate 3 to fill and compensate for shrinkage of the upper mounting edge of the outer ring, the outer ring, the lower mounting edge of the outer ring, and the blades through Gate 1. Gate 4 connects the upper and lower mounting edges of the inner ring. Gate 5 assists Gate 6 to fill and compensate for shrinkage of the upper mounting edge of the inner ring, the inner ring, the lower mounting edge of the inner ring, and the blades through Gate 4. Risers 1 and Risers 2 are connected to the upper runner 9, and the runner 9 is connected to the sprue cup 10. The runner 9 is evenly distributed along the vane ring.

[0018] The width of Gate 1 is not greater than that of Gate 3, and the thickness does not exceed the upper mounting edge of the outer ring. Gate 1 is aligned with Gate 3 directly above it, and the remaining dimensions are coordinated with the outer ring surface and the upper and lower mounting edges.

[0019] The center line of Gate 2 is aligned with the center line of Gate 3. Gate 2 is wider at the top and narrower at the bottom, wider outside and narrower inside, larger at the top and smaller at the bottom. The inner side is in contact with Gate 3, the upper mounting edge of the outer ring, and Gate 1. The upper end is flush with Gate 3. The outer side is an arc surface or an inclined surface, and the width is less than the width of Gate 3, but not less than one-fourth of the width of Gate 3. The contact part of Gate 2 and Gate 3 is tangent to its inclined surface.

[0020] The cross-section of Gate 3 is a right trapezoid, with the inclined line on the outside, the inclined angle being 15° - 40°, the right angle facing the axis direction of the casting. Both the inner and outer surfaces are designed as arcs along the mounting edge of the casting. The bottom width is the same as the thickness of the upper mounting edge of the casting, the height is 20 mm - 50 mm, and the chord length of the arc is 25 mm - 50 mm.

[0021] The width of Gate 4 is not greater than that of Gate 6, and the thickness does not exceed the upper mounting edge of the inner ring. Gate 4 is aligned with Gate 6 directly above it, and the remaining dimensions are coordinated with the inner ring surface and the upper and lower mounting edges.

[0022] The center line of gate five 5 is aligned with the center line of gate six 6. Gate five 5 is wider at the top and narrower at the bottom, wider on the outside and narrower on the inside, larger at the top and smaller at the bottom. The inner side is in contact with gate six 6, the installation edge on the inner ring and gate four 4. The upper end is flush with gate six 6. The outer side is an arc surface or an inclined surface, and its width is less than that of gate six 6, but not less than one-fourth of the width of gate six 6. The contact part between gate five 5 and gate six 6 is tangent to its inclined surface.

[0023] The cross-section of gate six 6 is a right trapezoid, with the inclined line on the outside, the inclined angle being 15° - 40°, the direction perpendicular to the axis of the casting being a right angle, both the inner and outer surfaces being designed as arcs along the installation edge of the casting, the bottom width being the same as the thickness of the installation edge of the casting, the height being 20 mm - 50 mm, and the chord length of the arc being 25 mm - 50 mm.

[0024] The outer contour dimensions of riser one 7 and riser two 8 are larger than the gate dimensions below. The inner side surfaces are aligned with the inner arc surfaces of the gates below. Riser one 7 and riser two 8 are connected to the upper cross-gate 9, and the cross-gate 9 is connected to the sprue cup 10.

[0025] Example 1

[0026] A pouring investment mold for a K4648 alloy blade ring with an outer diameter of 400 mm. Among them, gate three 3 is an arc-shaped inner gate arranged along the installation edge on the outer ring, with a chord width of 30 mm, the cross-section being a right trapezoid, the lower side being the same as the thickness of the installation edge on the outer ring, the inclined side inclining upward by 20°, and the height being 25 mm; Gate two 2 is aligned with the center line of gate three 3. The outer side is an arc surface with a radius of 35 mm. The upper end is flush with gate three 3, and the distance from the outer ring surface of the installation edge is 25 mm. The lower end is connected to the middle part of gate one 1. The outer width at the upper end is 12 mm, and the width at the contact part between the inner side and gate one 1 or the outer ring installation edge is 8 mm. The contact part with gate three 3 is tangent to the inclined surface; Gate one 1 is aligned with gate three 3 above, with a chord width of 25 mm, and the other dimensions are coordinated with the outer ring surface and the upper and lower installation edges; The cross-section of riser one 7 is 35 mm × 35 mm, with a height of 25 mm. It is connected to gate two 2 and gate three 3 below, and the inner side surface is aligned with the inner arc surface of gate three 3. It is connected to the cross-gate 9 above; Gate one 1, gate two 2, gate three 3 and riser one 7 can be combined to form a runner, which is convenient for precise positioning and improves production efficiency; The layout forms of gate four 4, gate five 5, gate six 6 and riser two 8 are the same as those of gate one 1, gate two 2, gate three 3 and riser one 7; There are six groups of cross-gates 9, which are evenly distributed along the blade ring.

[0027] Example 2

[0028] A casting mold for a K4169 alloy blade ring with an outer diameter of 600 mm, wherein a gate 3 is an arc-shaped inner gate arranged along the upper mounting edge of the outer ring, with a chord width of 40 mm and a right-angle trapezoidal cross section, the lower side having the same thickness as the upper mounting edge of the outer ring, the beveled side being inclined upward by 40° and 35 mm in height; a gate 2 is aligned with the center line of the gate 3, the outer side is an inclined surface with a larger upper side and a smaller lower side, the upper end is flush with the gate 3, the distance from the outer ring surface of the mounting edge is 30 mm, the lower tip is butted against two-thirds of the gate 1, the outer side of the upper end is 15 mm wide, the inner side is 10 mm wide at the junction with the outer ring mounting edge and the gate 1, and the contact with the gate 3 The inclined surfaces are tangent; gate 1 is directly opposite to gate 3 above, with a chord width of 35mm, and the other dimensions are coordinated with the outer ring surface and the upper and lower mounting edges; riser 17 has a cross-section of 45mm×45mm and a height of 30mm, connected to gate 2 and gate 3 below, and the inner side surface is aligned with the inner arc surface of gate 3 3, and connected to cross runner 9 above; gate 1, gate 2, gate 3 3 and riser 1 7 can be combined into a forming runner, which is convenient for precise positioning and improves production efficiency; the arrangement of gate 4, gate 5, gate 6 and riser 2 8 is the same as that of gate 1, gate 2, gate 3 3 and riser 1 7; there are eight groups of cross runners 9, which are evenly distributed along the blade ring.

Claims

1. A pouring investment mold for a vane ring casting, characterized in that: It includes a casting, a pouring basin, a runner, riser 1, riser 2, gate 1, gate 2, gate 3, gate 4, gate 5, and gate 6; the casting includes an outer ring, an inner ring, and blades; gate 1 connects the upper and lower mounting edges of the outer ring, and gate 2 and auxiliary gate 3 fill and feed the upper mounting edge of the outer ring, the outer ring, the lower mounting edge of the outer ring, and the blades through gate 1; gate 4 connects the upper and lower mounting edges of the inner ring, and gate 5 and auxiliary gate 6 fill and feed the upper mounting edge of the inner ring, the inner ring, the lower mounting edge of the inner ring, and the blades through gate 4; riser 1 and riser 2 are connected to the upper runner, the runner is connected to the pouring basin, and the runner is evenly distributed along the blade ring. The width of gate 1 is not greater than that of gate 3, and the thickness does not exceed the upper mounting edge of the outer ring; gate 1 is aligned with gate 3 directly above it, and the other dimensions are coordinated with the outer ring surface and the upper and lower mounting edges. The center line of gate 2 is aligned with the center line of gate 3. Gate 2 is wider at the top and narrower at the bottom, wider outside and narrower inside, larger at the top and smaller at the bottom. The inner side is in contact with gate 3, the upper mounting edge of the outer ring, and gate 1. The upper end is flush with gate 3. The outer side is an arc surface or an inclined surface. The width is less than the width of gate 3, but not less than one-fourth of the width of gate 3; the contact part of gate 2 and gate 3 is tangent to its inclined surface. The cross-section of gate 3 is a right trapezoid, with the inclined line on the outside, the inclined angle being 15° - 40°, the right angle facing the axis direction of the casting. Both the inner and outer surfaces are designed as arcs along the mounting edge of the casting. The bottom width is the same as the thickness of the upper mounting edge of the casting, the height is 20 mm - 50 mm, and the chord length of the arc is 25 mm - 50 mm. The width of gate 4 is not greater than that of gate 6, and the thickness does not exceed the upper mounting edge of the inner ring; gate 4 is aligned with gate 6 directly above it, and the other dimensions are coordinated with the inner ring surface and the upper and lower mounting edges. The center line of gate 5 is aligned with the center line of gate 6. Gate 5 is wider at the top and narrower at the bottom, wider outside and narrower inside, larger at the top and smaller at the bottom. The inner side is in contact with gate 6, the upper mounting edge of the inner ring, and gate 4. The upper end is flush with gate 6. The outer side is an arc surface or an inclined surface. The width is less than the width of gate 6, but not less than one-fourth of the width of gate 6; the contact part of gate 5 and gate 6 is tangent to its inclined surface. The cross-section of gate 6 is a right trapezoid, with the inclined line on the outside, the inclined angle being 15° - 40°, the right angle facing away from the axis direction of the casting. Both the inner and outer surfaces are designed as arcs along the mounting edge of the casting. The bottom width is the same as the thickness of the mounting edge of the casting, the height is 20 mm - 50 mm, and the chord length of the arc is 25 mm - 50 mm.

2. The investment casting of a vane ring casting according to claim 1, wherein: The outer contour dimensions of riser 1 and riser 2 are larger than the gate dimensions below, and the inner side is aligned with the inner arc surface of the gate below.

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