Plate forging forming method and die for R-shaped fork ring parts

Abstract

The present invention provides a sheet metal forging die for an R-shaped fork ring part, comprising a shrinking extrusion punch, a shearing punch, a die, a die backing plate, a nitrogen spring, a floating mandrel, an upper die base, and a lower die base. The present invention also provides a sheet metal forging method for the R-shaped fork ring part, wherein a tube blank having an outer diameter equal to that of a cylindrical target part is placed on the die backing plate, the floating mandrel remains stationary, and the shrinking extrusion punch is lowered until a rib having a thickness equal to that of the target part is formed at the upper end of the tube blank. The shrinking extrusion punch is replaced with a shearing punch, and the downward movement of the punch forces the metal material to continuously flow into the semi-enclosed cavity formed by the shearing punch and the floating mandrel through shear deformation. Finally, the floating mandrel or a lower ejector pin ejects the part, completing demolding and obtaining the target part. The present invention achieves the formation of an R-shaped fork ring part within a limited number of process steps, effectively resolving the difficulties of forming such parts with complex features and low material utilization. The present invention has the advantages of simple process steps, low forming load, and high forming accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of metal plastic forming, in particular to a forging method and a die for an R-shaped fork ring part plate. Background Art

[0002] The fork ring is a crucial component of a rocket fuel tank. Therefore, its performance directly impacts the rocket's launch success rate and payload capacity. However, due to its extreme geometry (the flange forms an angle less than 90 degrees with the cylinder wall) and high performance requirements, the R-shaped fork ring is difficult to manufacture efficiently and cost-effectively. Currently, machining is a relatively effective method for producing this R-shaped fork ring, but it still suffers from low material utilization and poor mechanical properties.

[0003] Therefore, how to change the current situation of low efficiency, high cost and poor mechanical properties in the forming of R-shaped fork ring parts in the existing technology has become an urgent problem to be solved by technical personnel in this field. Summary of the Invention

[0004] The purpose of the present invention is to provide a plate forging forming method and die for an R-shaped fork ring part to solve the problems existing in the above-mentioned prior art and improve material utilization, production efficiency and forming performance.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention provides a plate forging forming die for an R-shaped fork ring part, comprising a shrinking extrusion punch, a shearing punch, a die, a die pad, a nitrogen spring, a floating core shaft, an upper die base and a lower die base, wherein the shrinking punch and the shearing punch can be fixed to the upper die base by screws and pins, the die pad is arranged at the bottom of the die and the two are connected and positioned on the lower die base, the floating core shaft is slidably connected to the die pad, the floating core shaft can extend into the die, and there is a gap between the outer wall of the floating core shaft and the inner wall of the die, the floating core shaft is placed on the nitrogen spring, the nitrogen spring is fixed on the lower die base, and the limiting elements are all limiting blocks on the press.

[0006] Preferably, the inner wall of the necking extrusion punch has an angle with the axial direction, the inner wall of the shearing punch also has an angle with the axial direction, and the angles of the two are equal.

[0007] Preferably, the upper end of the floating mandrel has the same angle as the inner wall of the necking extrusion punch.

[0008] The present invention also provides a plate forging method for an R-shaped fork ring part, using the plate forging die for the R-shaped fork ring part, comprising the following steps:

[0009] Step 1: Place a tube blank with an outer diameter equal to that of the cylindrical target part on the die pad, keep the floating mandrel stationary, and move the necking extrusion punch downward until a rib with a thickness equal to the wall thickness of the target part is formed on the upper end of the tube blank;

[0010] Step 2: Replace the necking extrusion punch with a shearing punch. The downward movement of the punch forces the metal material to continuously flow into the semi-enclosed cavity formed by the shearing punch and the floating mandrel through shear deformation.

[0011] Step 3: Use the floating mandrel or lower ejector to eject the part and complete demoulding;

[0012] Preferably, in step 2, the shearing punch and the floating mandrel move downward synchronously.

[0013] Compared with the prior art, the present invention has achieved the following technical effects: the plate forging forming die of the R-shaped fork ring part of the present invention includes a shrinking extrusion punch, a shearing punch, a die, a die pad, a nitrogen spring, a floating core shaft, an upper die base and a lower die base, the shrinking punch and the shearing punch can be fixed to the upper die base by screws and pins, the die pad is arranged at the bottom of the die and the two are connected and positioned on the lower die base, the floating core shaft is slidably connected to the die pad, the floating core shaft can be extended into the die, and there is a gap between the outer wall of the floating core shaft and the inner wall of the die, the floating core shaft is placed on the nitrogen spring, the nitrogen spring is fixed on the lower die base, and the limiting elements are all limiting blocks on the press. The present invention also provides a sheet metal forging method for an R-shaped fork ring part. A tube blank with an outer diameter equal to that of a target cylindrical part is placed on a die backing plate. A floating mandrel remains stationary, and a shrinking extrusion punch is lowered until a rib having a thickness equal to the wall thickness of the target part is formed at the upper end of the tube blank. The shrinking extrusion punch is replaced with a shearing punch. The downward movement of the punch forces the metal material to continuously flow into the semi-enclosed cavity formed by the shearing punch and the floating mandrel through shear deformation. Finally, the floating mandrel or a lower ejector pin ejects the part, completing demolding and obtaining the target part. The present invention achieves the formation of an R-shaped fork ring within a limited number of process steps, effectively addressing the difficulties of forming such parts and the low material utilization. It has the advantages of simple process steps, low forming load, and high forming accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1This is a schematic cross-sectional view of the forging die for the R-shaped fork ring component plate of the present invention when working in step 1;

[0016] Figure 2 This is a schematic cross-sectional view of the forging die for the R-shaped fork ring component plate of the present invention during operation in step 2;

[0017] Figure 3 Schematic diagram of a tube blank formed by the forging method of the R-shaped fork ring part plate of the present invention;

[0018] Figure 4 Schematic diagram of a part formed by necking and extrusion using the forging method for an R-shaped fork ring part plate of the present invention;

[0019] Figure 5 This is a schematic diagram of a part after shearing and forming using the R-shaped fork ring part plate forging forming method of the present invention;

[0020] Among them, 1 is the shrinking extrusion punch, 2 is the floating mandrel, 3 is the die, 4 is the die pad, 5 is the nitrogen spring, 6 is the shearing punch, 7 is the upper die base, 8 is the lower die base, D is the outer diameter of the tube, d 0 is the inner diameter of the tube, d 1 is the minimum inner diameter of the part after shrinkage forming, d 2 is the minimum inner diameter of the part after shearing. t 0 is the wall thickness of the tube, h 0 is the height of the tube, h 1 is the height of the part after shrinking, h 2 is the height of the part after shearing. t 1 is the thickness of the rib of the fork ring part, t 2 is the thickness of the straight wall portion at the upper end of the fork ring part, α It is the shrinkage angle, and also the inclination angle of the rib of the fork ring part. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a plate forging forming die for an R-shaped fork ring part to solve the problems existing in the above-mentioned prior art and improve the production efficiency and mechanical properties of the formed parts.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Please refer to Figure 1-5 ,in, Figure 1 This is a schematic cross-sectional view of the R-shaped fork ring part plate forging die of the present invention during operation in step 1. Figure 2 This is a schematic cross-sectional view of the forging die for the R-shaped fork ring component plate of the present invention during step 2. Figure 3 Schematic diagram of a tube blank formed by the forging method of the R-shaped fork ring part plate of the present invention. Figure 4 This is a schematic diagram of a part formed by necking and extrusion using the forging method for an R-shaped fork ring part plate according to the present invention. Figure 5 This is a schematic diagram of a part after shearing and forming using the R-shaped fork ring part plate forging forming method of the present invention.

[0025] The present invention provides a cylindrical plate forging forming die with a small rounded corner feature, comprising a shrinking extrusion punch 1, a shearing punch 6, a die 3, a die pad 4, a nitrogen spring 5, a floating core shaft 2, an upper die base 7 and a lower die base 8. The shrinking punch 1 and the shearing punch 6 can be fixed to the upper die base 7 by screws and pins. The die pad 4 is arranged at the bottom of the die 3 and the two are connected and positioned on the lower die base 8. The floating core shaft 2 is slidably connected to the die pad 4. The floating core shaft 2 can extend into the die 3, and there is a gap between the outer wall of the floating core shaft 2 and the inner wall of the die 3. The floating core shaft 2 is placed on the nitrogen spring 5, and the nitrogen spring 5 is fixed on the lower die base 8. The limiting elements are all limiting blocks on the press.

[0026] When using the cylindrical plate forging die with a small rounded corner feature of the present invention, a tube blank with an outer diameter equal to that of the target cylindrical part is placed on a die backing plate 4. The floating mandrel 2 remains stationary, and the shrinking extrusion punch 1 is lowered until a rib with a thickness equal to the wall thickness of the target part is formed at the upper end of the tube blank. The shrinking extrusion punch 1 is replaced with a shearing punch 6. The downward movement of the punch 6 forces the metal material to continuously flow into the semi-enclosed cavity formed by the shearing punch 6 and the floating mandrel 2 through shear deformation. Finally, the floating mandrel 2 or the lower ejector pin ejects the part, completing demolding and obtaining the target part. The present invention achieves the formation of an R-shaped fork ring within a limited number of process steps, effectively solving the difficulties of forming such parts and the low material utilization. It has the advantages of simple process steps, low forming load, and high forming accuracy. It should be noted that the necking extrusion punch 1, the shearing punch 6 and the floating core shaft 2 can all be connected to a press, which can drive the necking extrusion punch 1, the shearing punch 6 and the floating core shaft 2 to reciprocate respectively, and the floating core shaft 2 can also be connected to the nitrogen spring 5.

[0027] In this specific embodiment, the limiting elements are all limiting blocks on the press, and during the forming step 1, it should be ensured that the bottom dead point position of the necking extrusion punch has a gap with the upper end of the die.

[0028] In this specific embodiment, the floating mandrel 2 and the die backing plate 4 are matched with H7 / g6.

[0029] The present invention also provides a plate forging method for an R-shaped fork ring part, using the plate forging die for the R-shaped fork ring part, comprising the following steps:

[0030] Step 1: According to the characteristics of the cylindrical target part, a cylindrical part with an outer diameter of D , wall thickness is t 0, height is h 0 tube, the tube is positioned on the die pad 4 with the outer tube wall as the positioning. The press has a hydraulic cylinder output mechanism under it. The necking extrusion punch 1 is connected to the slider in the main cylinder of the press, and the floating mandrel 2 is connected to the nitrogen spring 2. First, the floating mandrel 2 is moved to the upper limit under the action of the floating mandrel and remains stationary. Then, the main cylinder of the press drives the punch 1 downward at a uniform speed to form the upper end surface of the tube to form a necking extrusion part. Figure 4 As shown, the height of the part after shrinkage extrusion is h 1. Minimum inner diameter is d 1. Rib wall thickness is t 1. The shrinking angle is α .

[0031] Step 2: The main cylinder of the press moves upward to drive the punch 1 to move to the upper limit and then keep it stationary, and then replace it with the shearing punch 6. Then the main cylinder of the press drives the shearing punch 6 to continue to move downward, forcing the metal to continuously flow into the semi-closed cavity surrounded by the shearing punch 6 and the floating mandrel 2, thereby shearing out a tubular part with an oblique rib in the middle, such as Figure 5 As shown, the part height is h 2. Minimum inner diameter is d 2. The upper wall thickness is t 2. The wall thickness of the lower end is t 0, t 0. t 1. t 2 The thickness of the three locations may be different. It should be noted that the lower limit position may be specifically set according to the specific target formed part.

[0032] Step 3. After the part is formed, the demolding process is carried out. The floating core shaft 2 connected to the hydraulic cylinder below the press remains stationary, and the main cylinder of the press drives the shear punch 6 to return and separate from the part. Then the hydraulic cylinder below the press drives the floating core shaft 2 upward to push the part out of the die 3.

[0033] Specifically, the inner wall of the necking extrusion punch 1 has an angle with the axial direction.α The inner wall of the shear punch 6 also has the same angle with the axial direction α Similarly, the upper end of the floating mandrel also has the same angle as the inner wall of the necking extrusion punch. α , the specific size can be adjusted according to the target part size.

[0034] In step 2, the shearing punch 6 and the floating mandrel 2 move downward synchronously.

[0035] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A plate forging method for an R-shaped fork ring part, using a plate forging die for an R-shaped fork ring part, characterized in that: The method comprises a necking extrusion punch of step one, a shearing punch of step two, and the dies of steps one, two and three, a die pad, a nitrogen spring, a floating mandrel, an upper die base and a lower die base, wherein the necking extrusion punch and the shearing punch can be fixed to the upper die base by screws and pins, the die pad is arranged at the bottom of the die and the two are connected and positioned on the lower die base, the floating mandrel is slidably connected to the die pad, the floating mandrel can extend into the die, and a gap is provided between the outer wall of the floating mandrel and the inner wall of the die, the floating mandrel is placed on the nitrogen spring, and the nitrogen spring is fixed to the lower die base; the forming method comprises the following steps: Step 1: Place a tube blank with an outer diameter equal to that of the cylindrical target part on the die pad, keep the floating mandrel stationary, and move the necking extrusion punch downward until a rib with a thickness equal to that of the target part is formed on the upper end of the tube blank; Step 2: Replace the necking extrusion punch with a shearing punch. The downward movement of the punch forces the metal material to continuously flow into the semi-enclosed cavity formed by the shearing punch and the floating mandrel through shear deformation. Step 3: Use the floating mandrel or lower ejector to eject the part, complete demoulding, and obtain the target part.

2. The plate forging method of the R-shaped fork ring part according to claim 1, characterized in that: The inner wall of the necking extrusion punch has an angle with the axial direction, and the inner wall of the shearing punch also has an angle with the axial direction, and the angles of the two are equal.

3. The plate forging method of the R-shaped fork ring part according to claim 1, characterized in that: The upper end of the floating core shaft has the same angle as the inner wall of the necking extrusion punch.

4. The plate forging method of the R-shaped fork ring component according to claim 1, characterized in that: In the step 2, the shearing punch and the floating mandrel move downward synchronously.

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