A U-shaped cross-section inclined conical annular reinforcing rib flanging forming tool and method

Abstract

The application discloses a U-shaped section inclined taper ring-shaped reinforcing rib flanging forming tool, which comprises a lower die plate, a sleeve, a forming ring, a base and a supporting ring are arranged on the lower die plate from outside to inside, the sleeve is connected with an upper cover plate, the base is provided with a ring groove, the ring groove is used for pre-positioning a to-be-flanged part, a protruding structure is arranged on the inner side of the forming ring in an inclined manner, a supporting structure which is opposite to the inclined surface of the protruding structure is arranged on the outer side of the supporting ring, the to-be-flanged part is clamped and fixed, a large-end flanging die or a small-end flanging die is arranged on the forming ring and the supporting ring, a pressing plate is arranged on the flanging die, the pressing plate is pressed to complete multiple flanging operations. The application realizes that the to-be-flanged part is clamped once on the ordinary hydraulic equipment, the large-end flanging forming and the small-end flanging forming are respectively carried out, the die structure is simple, the cost is not high, the to-be-flanged part can be clamped and accurately positioned, the blank stability in the forming process is ensured, and finally the forming size and quality are controllable.

Description

Technical Field

[0001] This invention relates to the field of mold forming technology, and in particular to a U-shaped cross-section oblique cone annular reinforcing rib flanging forming tooling and method. Background Technology

[0002] U-shaped cross-section oblique cone annular stiffeners are mainly used for structural support and reinforcement of thin-walled nozzles in liquid rocket engines. The stiffeners are assembled and connected to the liquid rocket engine nozzles using welding. The length of the straight section of the oblique cone of the stiffener directly affects the welding quality of the remaining nozzle sections.

[0003] Currently, U-shaped cross-section oblique tapered annular reinforcing ribs are mainly processed using manual forming or flexible spinning forming methods. Manual forming involves holding and fixing the pre-flanged part with a support ring and a forming ring, leveling the part manually by measurement, and determining if the flanging height meets requirements. Then, a wooden mallet is used to tap the part circumferentially to achieve the flanging operation. This method has a simple tooling structure and low manufacturing cost, but it is labor-intensive, results in poor part consistency, and has low work efficiency. Flexible spinning forming uses a horizontal lathe with specially designed tooling to hold and fix the part on the machine spindle. Special forming rollers are then fixed to the tool holder, and the forming rollers are used to shape the pre-flanged part to the forming surface to achieve the flanging. This method is simple to operate and has high flanging efficiency, but it requires high tooling precision, has a complex mold assembly process, and demands a high level of operator skill. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a U-shaped cross-section oblique cone annular reinforcing rib flanging forming tooling and method, which can realize flanging forming operation on ordinary hydraulic equipment, with simple operation and stable product quality.

[0005] The technical solution of this invention is: a U-shaped cross-section oblique cone annular reinforcing rib flanging forming fixture, including a lower template, on which a sleeve, a forming ring, a base and a support ring are arranged from the outside to the inside. The sleeve is connected to an upper cover plate. The base is provided with an annular groove for pre-limiting the part to be flanged. A protruding structure is provided obliquely upward on the inner side of the forming ring. A support structure is provided on the outer side of the support ring opposite to the oblique surface of the protruding structure to achieve clamping and fixing of the part to be flanged. A large-end flanging die or a small-end flanging die is provided on the forming ring and the support ring. A pressure plate is provided on the flanging die. By applying pressure to the pressure plate, multiple flanging operations are completed.

[0006] The present invention is further improved as follows:

[0007] The tooling also includes a flattening ring and a cover plate set above the support ring to achieve leveling and clamping of the end face of the part to be flanged.

[0008] The length of the inclined surface of the outer support structure of the support ring is the same as the length of the straight segment on the outer side of the formed part.

[0009] The dimensions of the protruding inclined surface on the inner side of the forming ring are consistent with the dimensions of the inner surface of the formed part, and the forming ring is a split structure, which facilitates the disassembly of the formed part.

[0010] The depth of the annular groove in the base is determined by the length of the clamping surface formed by the forming ring and the support ring after the part to be flanged is assembled and clamped. The contact surface between the base and the support ring support structure is lower than the lower surface of the support ring support structure after the part to be flanged is assembled and clamped, forming a gap range of 0.5mm-0.8mm.

[0011] The large-end flanging mold includes large-end flanging mold I, large-end flanging mold II, and large-end flanging mold III. The flanging angle of each flanging mold decreases sequentially from the initial flanging angle to the final flanging angle.

[0012] The small-end flanging mold includes small-end flanging mold I, small-end flanging mold II, and small-end flanging mold III. The flanging angle of each flanging mold decreases sequentially from the initial flanging angle to the final flanging angle. Among them, small-end flanging mold I and small-end flanging mold II are used to realize the pre-flanging of the small-end negative angle hypotenuse as a positive angle.

[0013] The height difference between the contact surface of the flattening ring and the part to be flanged, and the contact surface of the flattening ring and the support ring, is determined by the length of the exposed clamping surface of the part to be flanged after assembly and clamping, and the assembly positional relationship between the support ring and the flattening ring.

[0014] The tooling also includes a rotating lifting ring set in the lower template, which is used to flip the tooling as a whole.

[0015] The present invention also provides a processing method using a U-shaped cross-section oblique tapered annular reinforcing rib flange forming tooling.

[0016] Use tooling to position and clamp the parts to be flanged;

[0017] Place the entire fixture onto the hydraulic press, and use the large end flanging die in sequence, applying pressure with the hydraulic press to complete the large end flanging operation; rotate the entire fixture 180°; and use the small end flanging die in sequence, applying pressure with the hydraulic press to complete the small end flanging operation.

[0018] The flanged part is removed from the forming ring, completing the part forming process.

[0019] The advantages of this invention compared to existing technologies are as follows: This invention successfully achieves large and small end flanging forming on ordinary hydraulic equipment through a single clamping of the blank. The mold structure is simple and the cost is low. The blank can be clamped and precisely positioned under the combined action of the forming ring, base, support ring, and flattening ring, thereby ensuring the stability of the blank during the forming process and making the final formed size and quality controllable. Compared with manual forming, this method is more efficient and produces better product consistency. Compared with flexible spinning forming methods, it does not require special equipment, process exploration, or experimentation, resulting in a shorter production cycle and lower cost. Attached Figure Description

[0020] Figure 1 This is a process diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the assembly structure between the forming ring, base, support ring, flattening ring and blank of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the large-end flange model surface of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the small-end flange model surface of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the forming ring of the present invention. Detailed Implementation

[0025] To better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, the U-shaped cross-section oblique cone annular reinforcing rib flanging forming fixture includes a lower template I1. A rotating lifting ring 2 is provided inside the lower template I1. From the outside in, a sleeve 3, a forming ring 6, a base 7, and a support ring 8 are arranged on the sleeve 3. The lower end of the sleeve 3 is connected to the lower template I1 by screws 13, and the upper end is connected to the upper cover plate 4 by screws 5. The support ring 8 is connected to the lower template I1 by screws 12. When clamping the blank, a flattening ring 9 and a cover plate 10 are arranged above the forming ring 6 and the support ring 8. The cover plate 10 is fastened to the lower template I1 with screws 11, thus securing the fixture as a whole. During the flanging operation, large-end flanging molds I15, II16, and III17 or small-end flanging molds I18, II19, and III20 are arranged above the forming ring 6 and the support ring 8. A pressure plate 14 is arranged above the flanging molds. The "large end" refers to the end of the oblique cone blank with the larger diameter, while the "small end" refers to the end of the oblique cone blank with the smaller diameter.

[0027] like Figure 2The diagram shows the specific assembly structure between the forming ring 6, base 7, support ring 8, flattening ring 9, and the blank. The forming ring has a protruding structure angled upwards on its inner side, and the support ring has a support structure on its outer side opposite to the angled surface of the protruding structure. The base 7 has an annular groove to support the blank. The depth of the groove is determined by the length of the blank protruding from the clamping surface after clamping, ensuring contact between the blank and the bottom of the groove. The contact surface between the base 7 and the support ring 8 is slightly lower than the lower surface of the support ring 8 after clamping the blank, creating a gap that provides some support and limitation. The height difference between the contact surface between the flattening ring 9 and the blank, and between the flattening ring 9 and the support ring 8, is determined by the length of the blank protruding from the clamping surface after clamping and the assembly position relationship between the support ring 8 and the flattening ring 9, ensuring contact between the blank and the bottom of the flattening ring. The annular groove on the base 7 and the flattening ring 9 ensure a uniform length of the blank protruding from the clamping end face. The dimensions of the inclined surface of the support ring 8 are determined by the diameter of the large or small end of the U-shaped cross-section of the reinforcing rib, the taper, and the length of the straight section. During use, the blank is roughly positioned in height and circumference under the constraint of the base 7 and the forming ring 6. After the support ring 8 is placed in, its own weight aligns the support ring 8 and clamps the blank. In this state, the blank may shift; the flattening ring 9 then levels the blank and simultaneously presses the forming ring 6 against the support ring 8, achieving clamping and precise positioning of the blank.

[0028] like Figure 3 As shown, three large-end flanging molds, I15, II16, and III17, with different flanging angles, are designed. The flanging angles decrease from large to small, preferably evenly distributed from the initial to the final flanging angle. The specific flanging angle is determined based on the material properties. The profile of large-end flanging mold III17 represents the final U-shaped flanging cross-sectional size of the reinforcing rib's large end. In use, the large-end flanging molds are placed in sequence for flanging operations to achieve the flanging of the reinforcing rib's large end.

[0029] like Figure 4 As shown, three small-end flanging molds, I18, II19, and III20, with different flanging angles, are designed. The flanging angles decrease from large to small, preferably evenly distributed from the initial flanging angle to the final flanging angle. The specific flanging angle is determined based on the material properties. Small-end flanging molds I18 and II19 are mainly used for pre-flanging the negative angle bevel of the small end to a positive angle. The surface of small-end flanging mold III20 represents the final U-shaped flanging cross-section size of the reinforcing rib's small end. In use, the small-end flanging molds are placed sequentially for flanging operations to achieve the flanging of the reinforcing rib's small end.

[0030] The method for forming the U-shaped cross-section oblique tapered annular reinforcing rib by the present invention mainly includes the following steps:

[0031] (1) Assemble the lower template I1, sleeve 3, forming ring 6, and base 7. Figure 1 As shown in step one, assemble the blank by pressing the forming ring 6 with the upper cover plate 4 and connecting and securing it with screws 5 and 11. Place the oblique conical annular blank into the annular groove of the base 7. At this time, the blank is limited by the forming ring 6 and the base 7. Then, place the support ring 8, the flattening ring 9, and the cover plate 10, and press them firmly and fix them with screws 11. After completion, use screws 12 to connect and secure the support ring 8 to the lower template 1. At this time, the positioning and clamping of the blank is completed.

[0032] (2) Place the tooling on the hydraulic press, remove screw 11, take out the flattening ring 9 and cover plate 10, and press... Figure 1 Step 2: Place the large end flanging mold I 15, large end flanging mold II 16, and large end flanging mold III 17 in sequence, and place the pressure plate 14 on the flanging mold. Use a hydraulic press to perform three closed pressure operations. This step completes the flanging operation of the large end.

[0033] (3) After the large end flanging mold Ⅲ17 is used, remove the upper cover plate 4 and the pressure plate 14, and press... Figure 1 Step 3: Install the lower template II21 and connect it to the sleeve 3 and support ring 8 with screws. Lift the fixture off the hydraulic press, rotate it 180°, and then put it back on the hydraulic press.

[0034] (4) In this state, remove the original lower template I21 and press Figure 1 Step four: Reinstall the upper cover plate 4 and secure it with screws. Place the small end flanging mold I 18, small end flanging mold II 19, and small end flanging mold III 20 in sequence, and place the pressure plate 14 on the flanging mold. Use a hydraulic press to close and press three times respectively. This step completes the flanging operation of the small end.

[0035] (5) First, remove the upper cover plate 4, take out the pressure plate 14 and the small end flanging mold Ⅲ20, and then take out the forming ring 6 with the formed part. When the forming ring 6 is separated from the sleeve 3, the forming ring 6 is divided into two halves from the original dividing point, and the part is taken out from the forming ring 6, thus completing the forming and manufacturing of the part.

[0036] It is understood that this invention has been described through embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific circumstances without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

[0037] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A tooling for forming a U-shaped cross-section oblique cone annular reinforcing rib by flanging, characterized in that: The device includes a lower template, on which a sleeve, a forming ring, a base, and a support ring are arranged from the outside in. The sleeve is connected to an upper cover plate. The base has an annular groove for pre-limiting the workpiece to be flanged. The inner side of the forming ring has a protruding structure inclined upwards. The outer side of the support ring has a support structure opposite to the inclined surface of the protruding structure to achieve clamping and fixing of the workpiece to be flanged. A large-end flanging die or a small-end flanging die is set on the forming ring and the support ring. A pressure plate is set on the flanging die. By applying pressure to the pressure plate, multiple flanging operations are completed.

2. The U-shaped cross-section oblique cone annular reinforcing rib flange forming tooling according to claim 1, characterized in that: It also includes a flattening ring and a cover plate set above the support ring to achieve leveling and clamping of the end face of the part to be flanged.

3. The U-shaped cross-section oblique cone annular reinforcing rib flange forming tooling according to claim 1, characterized in that: The length of the inclined surface of the outer support structure of the support ring is the same as the length of the straight segment on the outer side of the formed part.

4. The U-shaped cross-section oblique cone annular reinforcing rib flange forming tooling according to claim 1, characterized in that: The dimensions of the protruding inclined surface on the inner side of the forming ring are consistent with the dimensions of the inner surface of the formed part, and the forming ring is a split structure, which facilitates the disassembly of the formed part.

5. The U-shaped cross-section oblique cone annular reinforcing rib flange forming tooling according to claim 1, characterized in that: The large-end flanging mold includes large-end flanging mold I, large-end flanging mold II, and large-end flanging mold III. The flanging angle of each flanging mold decreases sequentially from the initial flanging angle to the final flanging angle.

6. The U-shaped cross-section oblique cone annular reinforcing rib flange forming tooling according to claim 1, characterized in that: The small-end flanging mold includes small-end flanging mold I, small-end flanging mold II, and small-end flanging mold III. The flanging angle of each flanging mold decreases sequentially from the initial flanging angle to the final flanging angle. Among them, small-end flanging mold I and small-end flanging mold II are used to realize the pre-flanging of the small-end negative angle hypotenuse as a positive angle.

7. The U-shaped cross-section oblique tapered annular reinforcing rib flange forming tooling according to claim 2, characterized in that: The height difference between the contact surface of the flattening ring and the part to be flanged and the contact surface of the flattening ring and the support ring is determined by the length of the clamping surface exposed after the part to be flanged is assembled and clamped, and the assembly position relationship between the support ring and the flattening ring.

8. The U-shaped cross-section oblique cone annular reinforcing rib flange forming tooling according to claim 1, characterized in that: It also includes a rotating lifting ring set in the lower template to achieve overall flipping of the tooling.

9. A processing method using the U-shaped cross-section oblique tapered annular reinforcing rib flanging forming fixture as described in claim 2, characterized in that... include: Use tooling to position and clamp the parts to be flanged; Place the entire fixture onto the hydraulic press, and use the large end flanging die in sequence, applying pressure with the hydraulic press to complete the large end flanging operation; rotate the entire fixture 180°; and use the small end flanging die in sequence, applying pressure with the hydraulic press to complete the small end flanging operation. The flanged part is removed from the forming ring, completing the part forming process.

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