CN112974644B

CN112974644B - Deep U-shaped part integrated forming tool and method

Info

Publication number: CN112974644B
Application number: CN202110289737.XA
Authority: CN
Inventors: 李映; 周磊; 代春森; 陈超
Original assignee: Yichang Marine Diesel Engine Co ltd
Current assignee: Yichang Marine Diesel Engine Co ltd
Priority date: 2021-03-18
Filing date: 2021-03-18
Publication date: 2023-01-31
Anticipated expiration: 2041-03-18
Also published as: CN112974644A

Abstract

The invention provides a deep U-shaped part integrated forming tool and a deep U-shaped part integrated forming method. Through the decomposition forming step, a corresponding forming die is designed, so that the integrated forming of the deep U-shaped part can be completed at a lower cost by adopting the tool and the method, and the size requirement of a product is met.

Description

Deep U-shaped part integrated forming tool and method

Technical Field

The invention relates to the technical field of gas turbine machining, in particular to a deep U-shaped part integrated forming tool and a deep U-shaped part integrated forming method.

Background

The cover plate of the airfoil body of the gas turbine exhaust cylinder plays a role of pressing and supporting heat insulation cotton, is made of 347 stainless steel with the thickness of 2mm, and is of a deep U-shaped structure, as shown in figure 1. In order to improve the stability of the structure under the working conditions of high temperature, high pressure and vibration, the original welding form of the upper L-shaped structure is changed into an integrated forming form. The conventional molding mode has high requirements on equipment capacity, or a special mold with complex design and manufacture is required, and the processing and use requirements of the part cannot be met only by the existing processing equipment and process.

Disclosure of Invention

The invention aims to provide a deep U-shaped part integrated forming tool and a deep U-shaped part integrated forming method.

In order to achieve the technical characteristics, the invention aims to realize that: the utility model provides a dark U type part integration shaping frock, it is including being used for carrying out fashioned bed die structure to airfoil type body apron, the bed die structure cooperatees with last mould structure.

The lower die structure adopts a rectangular block, a die cavity for molding is processed in the center of the rectangular block, one end of the die cavity is a large U-shaped end, and the other end of the die cavity is a small U-shaped end; the big U-shaped end is used for being matched with a big opening end of the airfoil body cover plate, and the small U-shaped end is used for being matched with a small opening end of the airfoil body cover plate.

The die cavity is integrally of an isosceles trapezoid cavity structure, the isosceles trapezoid cavity structure is matched with a U-shaped bending portion of the airfoil profile cover plate, and two sides of the U-shaped bending portion are bent to form a first bending plate and a second bending plate which are symmetrically arranged.

The upper die structure comprises a forming die head, the shape of the forming die head is matched with the die cavity of the lower die structure, a pressure-bearing vertical plate is fixed to the center line of the top of the forming die head in a welding mode through welding spots, and the pressure-bearing vertical plate is in contact with an upper die of an oil press in the forming process.

After the forming die head and the die cavity are combined, gaps with the width of 2-3mm are formed on two sides of the forming die head respectively, so that the airfoil body cover plate can just enter the gaps.

The length of the die cavity along the central axis of the die cavity is at least 10mm greater than the length of the U-shaped bending part of the airfoil body cover plate.

The method for forming the deep U-shaped part by the integrated forming tool comprises the following steps:

the method comprises the following steps: designing a corresponding lower die structure and an upper die structure according to the size of a cover plate of the airfoil body to be molded, cutting the inner profile of the trapezoid and the outer profile of the rectangle in a numerical control cutting mode, polishing and cleaning cutting slag, further forming a die cavity on the lower die structure, and forming a molding die head on the upper die structure;

step two: round corners are processed on two long edges of the lower plane of the upper die structure, and the round corners are matched with inner round corner parts of the U-shaped bending parts;

step three: a pressure-bearing vertical plate is welded and fixed at the top end of the upper die structure;

step four: blanking the cover plate of the airfoil body according to the drawing size to form a blank plate;

step five: drawing two bending lines on the blank plate according to the forming size, selecting a corresponding flanging machine die according to the size of an inner chamfer of the U-shaped bending part, and sequentially pre-bending two included angles to an angle P respectively;

step six: connecting an upper die structure with an upper oil press tire of an oil press, placing a lower die structure on a lower oil press tire, aligning an upper die and a lower die, flatly placing a blank plate which is preliminarily bent to the top of the lower die structure, and aligning two bending positions with two long edges of a trapezoidal inner contour die cavity;

step seven: and controlling the oil press to press downwards, pressing the blank plate by the upper die and the lower die, pressing the blank plate into the lower die structure, and achieving the purpose of molding through the matching of the molding die head and the die cavity to finally form the airfoil body cover plate.

In the fifth step, the value of the angle P is 130-135 degrees.

The invention has the following beneficial effects:

1. the integrated forming tool can be used for integrated forming of deep U-shaped parts, the forming of the deep U-shaped parts is divided into two different procedures, and in the first step, a flanging machine is used for pre-bending two right-angle positions to about 135 degrees; the simple frock mould of design is then to the secondary oil pressure, because dark U type part bottom is trapezoidal, cuts out the trapezoidal profile the same with dark U type part bottom on a square plate through using numerical control cutting equipment, and profile is as last mould in the trapezoidal during oil pressure, and a square plate of trapezoidal outline lower plane welding is as the lower mould, carries out the secondary oil pressure to the part of folding in advance, makes the dimensional requirement that reaches the drawing, and then has effectively improved the shaping efficiency of part.

2. Through the matching between the lower die structure and the upper die structure, the one-time forming of the part can be finally realized.

Drawings

The invention is further illustrated by the following figures and examples.

Fig. 1 is an overall structure view of an airfoil body cover plate to be formed according to the present invention.

FIG. 2 is a plan view of an airfoil body cover plate according to the present invention.

FIG. 3 is a top view of the lower mold structure of the present invention.

FIG. 4 is a top view of the lower and upper mold structures of the present invention after mating.

FIG. 5 is a view C-C of FIG. 4 according to the present invention.

FIG. 6 is a state diagram of the present invention at the time of preliminary molding.

Fig. 7 is a state diagram of the present invention after molding.

In the figure: the device comprises an airfoil body cover plate 1, a lower die structure 2, a forming die head 3, a pressure-bearing vertical plate 4, welding spots 5, an upper die 6 of an oil press, a blank plate 7, an upper die structure 8 and a bottom plate 9;

a first bending plate 101, a second bending plate 102, a U-shaped bending part 103, a large opening end 104 and a small opening end 105;

a large U-shaped end 201, a rectangular block 202, a mold cavity 203, and a small U-shaped end 204.

Detailed Description

Embodiments of the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1-7, a deep U-shaped part integrated molding tool comprises a lower mold structure 2 for molding an airfoil-shaped body cover plate 1, wherein the lower mold structure 2 is matched with an upper mold structure 8. Through the cooperation between the lower die structure 2 and the upper die structure 8, one-time forming of parts can be finally realized. Effectively improving the forming efficiency and quality of parts. The integrated forming of the deep U-shaped part can be completed with low cost, and the size requirement of the product is met.

Further, the lower die structure 2 adopts a rectangular block 202, a die cavity 203 for molding is processed in the center of the rectangular block 202, one end of the die cavity 203 is a large U-shaped end 201, and the other end is a small U-shaped end 204; large U-shaped end 201 is adapted to mate with large open end 104 of airfoil body cover plate 1 and small U-shaped end 204 is adapted to mate with small open end 105 of airfoil body cover plate 1. The mold cavity 203 just matches with the shape structure of the airfoil body cover plate 1, so that the shape of the airfoil body cover plate is convenient to mold.

Further, the die cavity 203 is integrally in an isosceles trapezoid cavity structure, the isosceles trapezoid cavity structure is matched with the U-shaped bending portion 103 of the airfoil profile cover plate 1, and two sides of the U-shaped bending portion 103 are bent to form the first bending plate 101 and the second bending plate 102 which are symmetrically arranged.

Further, the upper die structure 8 comprises a forming die head 3, the shape of the forming die head 3 is matched with the die cavity 203 of the lower die structure 2, a pressure-bearing vertical plate 4 is fixedly welded at the top center line of the forming die head 3 through a welding point 5, and the pressure-bearing vertical plate 4 is in contact with an upper tire of an oil press in the forming process. The upper die structure 8 can be used for matching with the lower die structure 2, so that the airfoil body cover plate 1 is guaranteed to be molded in the pressing process.

Further, after the molding die 3 is combined with the cavity 203, gaps of 2 to 3mm width are formed on both sides thereof, respectively, so that the airfoil body cover plate 1 just enters the gaps. Through foretell size cooperation relation, guaranteed in the forming process that the thickness dimension of airfoil body apron 1 just cooperatees with clearance between them, and then guaranteed forming process.

Further, the length of the mold cavity 203 along the central axis thereof is at least 10mm greater than the length of the U-shaped bending part 103 of the airfoil body cover plate 1. And a certain length is reserved, so that the oil press can smoothly pass through the oil press.

Example 2:

the method for molding the deep U-shaped part by the integrated molding tool comprises the following steps:

the method comprises the following steps: designing a corresponding lower die structure 2 and an upper die structure 8 according to the size of an airfoil body cover plate 1 to be molded, cutting a trapezoidal inner contour and a rectangular outer contour in a numerical control cutting mode, polishing and cleaning cutting slag, further forming a die cavity 203 on the lower die structure 2, and forming a molding die head 3 on the upper die structure 8;

step two: round corners are processed on two long sides of the lower plane of the upper die structure 8, and the round corners are matched with the inner round corner parts of the U-shaped bending parts 103;

step three: the top end of the upper die structure 8 is welded and fixed with a pressure-bearing vertical plate 4;

step four: blanking the airfoil body cover plate 1 according to the drawing size to form a blank plate 7;

step five: drawing two bending lines on the blank plate 7 according to the forming size, selecting a corresponding flanging machine die according to the size of an inner chamfer of the U-shaped bending part 103, and sequentially pre-bending two included angles to an angle P respectively;

step six: connecting an upper die structure 8 with an upper hydraulic press tire 6 of a hydraulic press, placing a lower die structure 2 on a lower hydraulic press tire, aligning the upper die with the lower die, flatly placing a preliminarily bent blank plate 7 to the top of the lower die structure 2, and aligning two bending positions with two long edges of a trapezoidal inner outline die cavity 203;

step seven: and (3) controlling the oil press to press down, pressing the blank plate 7 by the upper die and the lower die, further pressing the blank plate into the lower die structure 2, and matching the forming die head 3 with the die cavity 203 to achieve the purpose of forming and finally forming the airfoil body cover plate 1.

Further, in the fifth step, the value of the angle P is 130-135 degrees. Through the above-mentioned angular relationship, it is ensured that the blank plate 7 can be positioned exactly on the top of the die cavity 203 in the subsequent molding process.

Example 3:

in this example, a 7f.04 gas turbine exhaust casing airfoil cover plate is taken as an example.

1. Tooling design, the specific structure of the 7F.04 airfoil body cover plate is shown in figure 2, and the dimensions are as follows: the widths of the bottoms of the two sections are respectively 80mm and 55mm, the distance between the two sections is 470mm, an isosceles trapezoid with a long side of 80mm, a short side of 55mm and a height of 470mm is drawn according to the three dimensions, the dimension between the two sections and the end part is respectively 115mm and 70mm, two inclined sides of the isosceles trapezoid extend to positions of 120mm and 75mm, two ends are respectively lengthened by 5mm to reserve enough space for oil pressure of parts, a cut inner contour, namely the outer contour of the forming die head 3, the vertex of the four sides of the trapezoid outwards deviates 100mm in each direction, and a cut rectangular outer contour, namely a rectangular block 202 is obtained, as shown in fig. 3. If select for use 50mm steel sheet preparation, form 3mm wide slot between last lower mould when cutting trapezoidal interior profile, during the oil pressure 2mm apron just in time can get into 3mm clearance, guarantee the implementation of oil pressure process.

2. Manufacturing a tool, selecting a steel plate with the thickness of 50mm and a material Q235B, cutting a trapezoidal inner outline and a rectangular outer outline by using a numerical control cutting mode, polishing and cleaning cutting slag, seeing that two included angles of a cover plate are R14 fillets from figure 2, processing the two long edges of the lower plane of the upper trapezoidal die into the R14 fillets, welding a 20 x 410 x 659 on the upper plane, wherein the two rounded angles are larger than the maximum width 444 of the cover plate, forming the thickness of the upper die into a 50-thick rectangular plate, completing manufacturing the integral upper die, welding a 20 x 300 x 880 bottom plate 9 below the rectangular lower die, and completing manufacturing the integral lower die, wherein the steel plate is shown in figure 4.

3. Forming a cover plate, unfolding laser blanking according to the drawing size, drawing two bending lines on a blanking part according to the forming size, selecting a proper flanging machine mould according to the R14 of the root, pre-folding two included angles to 135 degrees in sequence, connecting an upper mould structure with an upper mould of an oil press, placing a lower mould structure on the platform of the oil press, aligning an upper mould and a lower mould, flatly placing the part to the lower mould, aligning the included angles of the two 135 positions to two long edges of the trapezoid inner contour, controlling the oil press to press downwards, and applying pressure to the part by the upper mould and the lower mould, so that the part achieves the forming purpose, as shown in figures 6-7.

Claims

1. The method comprises the steps that a deep U-shaped part integrated forming tool is adopted to form the deep U-shaped part, the deep U-shaped part integrated forming tool comprises a lower die structure (2) used for forming an airfoil-shaped body cover plate (1), and the lower die structure (2) is matched with an upper die structure (8);

the lower die structure (2) adopts a rectangular block (202), a die cavity (203) for molding is processed at the central part of the rectangular block (202), one end of the die cavity (203) is a large U-shaped end (201), and the other end is a small U-shaped end (204); the large U-shaped end (201) is used for being matched with a large opening end (104) of the airfoil body cover plate (1), and the small U-shaped end (204) is used for being matched with a small opening end (105) of the airfoil body cover plate (1);

the die cavity (203) is integrally in an isosceles trapezoid cavity structure, the isosceles trapezoid cavity structure is matched with a U-shaped bending part (103) of the airfoil-shaped cover plate (1), and two sides of the U-shaped bending part (103) are bent to form a first bending plate (101) and a second bending plate (102) which are symmetrically arranged;

the upper die structure (8) comprises a forming die head (3), the shape of the forming die head (3) is matched with a die cavity (203) of the lower die structure (2), a pressure-bearing vertical plate (4) is fixedly welded at the central line position of the top of the forming die head (3) through a welding point (5), and the pressure-bearing vertical plate (4) is contacted with an upper die of an oil press in the forming process;

after the molding die head (3) is combined with the die cavity (203), gaps with the width of 2-3mm are respectively formed on two sides of the molding die head, so that the airfoil body cover plate (1) just enters the gaps;

the method is characterized by comprising the following steps:

the method comprises the following steps: designing a lower die structure (2) and an upper die structure (8) according to the size of an airfoil body cover plate (1) to be molded, cutting a trapezoidal inner contour and a rectangular outer contour in a numerical control cutting mode, polishing and cleaning cutting slag, forming a die cavity (203) on the lower die structure (2), and forming a molding die head (3) on the upper die structure (8);

step two: round corners are processed on two long sides of the lower plane of the upper die structure (8), and the round corners are matched with the inner round corner parts of the U-shaped bending parts (103);

step three: a pressure-bearing vertical plate (4) is welded and fixed at the top end of the upper die structure (8);

step four: blanking the airfoil body cover plate (1) according to the drawing size to form a blank plate (7);

step five: drawing two bending lines on the blank plate (7) according to the forming size, selecting a corresponding flanging machine die according to the size of an inner chamfer of the U-shaped bending part (103), and sequentially pre-bending two included angles to an angle P respectively;

step six: connecting an upper die structure (8) with an upper oil press tire (6) of an oil press, placing a lower die structure (2) on a lower oil press tire, aligning an upper die with a lower die, horizontally placing a blank plate (7) which is preliminarily bent to the top of the lower die structure (2), and aligning two bending positions with two long sides of a trapezoidal inner contour die cavity (203);

step seven: and controlling the oil press to press downwards, pressing the blank plate (7) by the upper die and the lower die, further pressing the blank plate into the lower die structure (2), and achieving the purpose of molding through the matching of the molding die head (3) and the die cavity (203) to finally form the airfoil body cover plate (1).

2. The method for molding the deep U-shaped part by adopting the deep U-shaped part integrated molding tool according to claim 1, is characterized in that: the length of the die cavity (203) along the central axis is 10mm greater than that of the U-shaped bending part (103) of the airfoil body cover plate (1).

3. The method for molding the deep U-shaped part by adopting the deep U-shaped part integrated molding tool according to claim 1, is characterized in that: and a bottom plate (9) is fixed at the bottom of the lower die structure (2).

4. The method for molding the deep U-shaped part by adopting the deep U-shaped part integrated molding tool according to claim 1, is characterized in that: in the fifth step, the value of the angle P is 130-135 degrees.