Multi-directional die forging forming die and forming method for elbow forge piece

Abstract

The invention relates to the technical field of closed multi-directional die forging, in particular to an elbow forge piece multi-directional die forging forming die and a forming method.The elbow forge piece multi-directional die forging forming die comprises a T-shaped ring, an upper punch and a die core, a connecting plate is arranged at the top of the T-shaped ring, and the upper punch is arranged in the T-shaped ring and connected with the connecting plate; the lower part of the T-shaped ring is matched with the mold core; a cavity consistent with an elbow forge piece in appearance is formed in the die core, a left horizontal punch is arranged on the left side of the die core, a right horizontal punch is arranged on the right side of the die core, the upper punch is used for forming an inner hole in the elbow forge piece in the vertical direction, and the right horizontal punch is used for forming an inner hole in the elbow forge piece in the horizontal direction. The multi-directional die forging process is adopted for forming the elbow forgings, smooth demolding can be guaranteed while inner hole forming of the forgings is reserved, the die sequentially applies deformation force to blanks to form the blanks according to specified process actions, the metal streamline in the whole forming process is complete, the size precision of the forgings is high, and the forming quality is good.

Description

Technical Field

[0001] The present invention relates to the technical field of closed multi-directional die forging, and particularly to a multi-directional die forging forming die and forming method for elbow forgings. Background Art

[0002] At present, the forging processes of elbow forgings are mostly free forging or die forging. The combined forming method of free forging and machining has the following problems: during free forging, the fluidity of the material has a certain degree of uncontrollability, and allowances need to be left in each direction of the blank. The dimensions after forming are inaccurate, and free forging can only forge blocks and cannot form internal holes; die forging forming mainly involves placing a metal blank into a die and cooperating with a press to deform the blank to fill the die cavity. However, the die forging forming process has many steps, low material utilization rate, discontinuous metal flow lines, and there are flash edges on the outside of the formed workpiece that need to be removed later. The internal hole forming is relatively shallow or even not formed, so it cannot be used to form deep or complex hole cavities. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a multi-directional die forging forming die and forming method for elbow forgings, which utilize the diversity of the multi-directional die forging forming method to process elbow forgings. The forgings have good forming quality and excellent comprehensive performance, and can change the disadvantages of the existing process.

[0004] The technical solution adopted by the present invention to solve its technical problems is: A multi-directional die forging forming die for elbow forgings includes a T-shaped ring, an upper punch, and a die core. A connecting plate is provided at the top of the T-shaped ring, and the upper punch is placed inside the T-shaped ring and connected to the connecting plate; the lower part of the T-shaped ring is matched with the die core; a cavity consistent with the outer shape of the elbow forging is provided inside the die core, a left horizontal punch is provided on the left side of the die core, and a right horizontal punch is provided on the right side. The upper punch is used to form the internal vertical hole of the elbow forging, and the right horizontal punch is used to form the internal horizontal hole of the elbow forging.

[0005] Compared with the prior art, the beneficial effects of the present invention are: The present invention uses a multi-directional die forging process to form elbow-shaped forgings. While retaining the internal hole forming of the forgings, smooth demoulding can be ensured. The die applies deformation forces to the blank in sequence according to the specified process actions to make it formed. The overall forming process has a complete metal flow line, high dimensional accuracy of the forgings, good forming quality, good surface quality, uniform deformation, excellent mechanical properties, and excellent comprehensive performance. It can change the disadvantages of the existing process and improve the service life of such forgings.

[0006] As a preference, a further technical solution of the present invention is: Preferably, the die core includes a lower die core and an upper die core, which are connected by guide posts; the lower die core and the upper die core take the plane where the central line of the forged part is located as the parting surface, and the cavity is divided into upper and lower chambers by the parting surface.

[0007] Preferably, the right horizontal punch includes a right horizontal fixed punch and a right horizontal moving punch. The cross-sections of the right horizontal fixed punch and the right horizontal moving punch are respectively semi-circular structures. A limit ring is arranged outside the right horizontal fixed punch, and the limit ring is placed in the cavity. The inner diameter of the limit ring is equal to the radius of the semi-circular cross-section of the right horizontal fixed punch. The limit ring forms a semi-circular inner cavity above the semi-circular cross-section, and the right horizontal moving punch is adapted to the semi-circular inner cavity; a right punching hole adapted to the right horizontal moving punch is opened at the bottom end of the upper die core, and the right punching hole is communicated with the cavity; a left punching hole adapted to the left horizontal punch is opened on the left side of the lower die core.

[0008] Preferably, semi-circular grooves are respectively arranged on the lower end surface of the T-shaped ring corresponding to the left horizontal punch and the right horizontal moving punch.

[0009] Preferably, the left horizontal punch and the right horizontal punch are coaxially arranged.

[0010] The present invention also relates to a multi-directional die forging forming method for elbow forgings, which is applicable to a multi-directional die forging forming die for elbow forgings. The specific steps are as follows: S1. Install the die. S2. Preheat the die and heat the blank. S3. Forging: After the blank is taken out of the furnace, it is placed on the lower die core. The forging equipment controls the T-shaped ring and the upper punch to move downward to extrude the blank. After the upper die moves in place, the forging equipment controls the left horizontal punch to move to extrude the lower die core, and at the same time controls the right horizontal moving punch to move to extrude the blank to complete the forging process. S4. The die returns and the forging is taken out: The T-shaped ring, the upper punch, the left horizontal punch and the right horizontal moving punch return under the action of the forging equipment, and the forging is taken out to complete the forging.

[0011] The present invention adopting the above technical solution, compared with the prior art, its prominent features are: The machined surface produced by the forging forming process of the present invention not only has small allowance, but also the outer shape and inner hole are both close to the outer shape and size of the part, and the raw material utilization rate is high; at the same time, the elbow forging manufactured by the technology of the present invention has the advantages of dense structure, material saving, dense metal streamline and long service life, which can effectively improve the reliability and service life of the forging and save the operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of an elbow forging in an embodiment of the present invention; Figure 2 is a schematic diagram of the effect of die closing in an embodiment of the present invention; Figure 3 It is a schematic structural diagram of a connecting plate, a T-shaped ring and an upper punch; Figure 4 It is a schematic structural diagram of a lower die core; Figure 5 It is a schematic structural diagram of an upper die core; Figure 6 It is a schematic structural diagram of a right horizontal fixed punch and a limit ring; Figure 7 It is a schematic structural diagram when the upper punch is separated from the die core; Figure 8 It is a sectional view when the whole mold is closed; Figure 9 It is a schematic diagram of a workpiece placed in the die core; Explanation of reference numerals in the drawings: 1. Lower die core; 2. Left horizontal punch; 3. T-shaped ring; 4. Connecting plate; 5. Upper punch; 6. Guide post; 7. Upper die core; 8. Right horizontal moving punch; 9. Right horizontal fixed punch; 10. Limit ring; 11. Semi-circular inner cavity; 12. Right punching hole; 13. Left punching hole; 14. Semi-circular groove; 15. Blank; 16. Positioning hole. Specific implementation manners

[0013] To make the above objects, features and advantages of the present application more obvious and understandable, the following will make a detailed description of the specific implementation manners of the present application with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below As Figures 1 to 9 shown, a multi-directional die forging forming die for elbow forgings is composed of a T-shaped ring 3, an upper punch 5, a die core, a connecting plate 4, etc. The upper end of the T-shaped ring 3 and the upper end of the upper punch 5 are respectively connected to the bottom of the connecting plate 4, and the upper punch 5 is placed at the center of the T-shaped ring 3. The upper end of the connecting plate 4 is connected to a forging device.

[0014] The inner hole of the T-shaped ring 3 is matched with the die core. The inside of the die core is provided with a cavity consistent with the outer shape of the elbow forging. A left horizontal punch 2 is arranged on the left side of the die core, and a right horizontal punch is arranged on the right side. The left horizontal punch 2 and the right horizontal punch are coaxially arranged; the upper punch 5 is used to form the inner hole in the vertical direction inside the elbow forging, and the right horizontal punch is used to form the inner hole in the horizontal direction inside the elbow forging.

[0015] Specifically, the die core is composed of an upper die core 7 and a lower die core 1. The lower die core 1 and the upper die core 7 take the plane where the center line of the formed forging is located as the parting surface, that is, the cavity is divided into two upper and lower chambers by the parting surface.

[0016] Positioning holes 16 are respectively formed on the contact surfaces of the lower die core 1 and the upper die core 7. The lower die core 1 and the upper die core 7 are connected by a guiding column 6 placed in the positioning hole 16, and the guiding column 6 can ensure the accuracy of the cooperation between the lower die core 1 and the upper die core 7.

[0017] The right horizontal punch consists of a right horizontal fixed punch 9 and a right horizontal moving punch 8. The cross-sections of the right horizontal fixed punch 9 and the right horizontal moving punch 8 are respectively semi-circular structures. An inner limiting ring 10 is fixedly connected to the outside of the right horizontal fixed punch 9, and the inner limiting ring 10 and the right horizontal fixed end are of an integral structure; the inner limiting ring 10 is placed in two chambers. The inner diameter of the inner limiting ring 10 is equal to the radius of the semi-circular cross-section of the right horizontal fixed punch 9. A semi-circular inner cavity 11 is formed above the right horizontal fixed punch 9 by the inner limiting ring 10. The right horizontal moving punch 8 is adapted to the semi-circular inner cavity 11, and the semi-circular inner cavity 11 guides and positions the right horizontal moving punch 8 to ensure the accuracy of the cooperation between the right horizontal moving punch 8 and the right horizontal fixed punch 9.

[0018] A right punching hole 12 adapted to the right horizontal moving punch 8 is formed at the bottom end of the upper die core 7, and the right punching hole 12 communicates with the cavity; a left punching hole 13 adapted to the left horizontal punch 2 is formed on the left side of the lower die core 1.

[0019] Semicircular grooves 14 are respectively formed on the lower end surface of the T-shaped ring 3 corresponding to the left horizontal punch 2 and the right horizontal moving punch 8.

[0020] The present invention also discloses a multi-directional die forging forming method for elbow forgings, which is applicable to a multi-directional die forging forming die for elbow forgings. The specific steps are as follows: S1. Install the die; assemble the die core. Fix the lower die core 1 on the forging platform, and then guide and connect the upper die core 7 and the lower die core 1 through the guiding column 6. During installation, ensure the installation accuracy of the upper die core 7 and the lower die core 1 to ensure their precise cooperation; a cavity consistent with the outer part of the elbow forging is formed inside the assembled upper die core 7 and lower die core 1; connect the T-shaped ring 3, the upper punch 5, the left horizontal punch 2, and the right horizontal moving punch 8 to the corresponding positions of the forging equipment respectively; when installing the above die, ensure the centering accuracy and positioning accuracy.

[0021] S2. Preheat the die and heat the blank 15; preheat the die to make the die temperature between 300 and 400 °C; the blank 15 is selected as a bar with a size of Φ350 x 280 mm. After the blank 15 is heated to the starting forging temperature and kept warm, it is ready to be put into the die.

[0022] S3. Forging: Place it on the lower die core 1. When placing, one side of the blank 15 is tangent to the end face of the right horizontal fixed punch 9. The forging equipment controls the T-ring 3 and the upper punch 5 to move downward to extrude the blank 15. Since the distance between the upper punch 5 and the blank 15 is greater than the distance between the T-ring 3 and the upper die core 7 and the lower die core 1, during the downward movement of the T-ring 3 and the upper punch 5, the T-ring 3 contacts the upper die core 7 and the lower die core 1 first, ensuring that before the upper punch 5 contacts the blank 15, the upper die core 7 and the lower die core 1 are within the T-ring 3 and cannot move horizontally. At the same time, the guide post 6 also restricts the relative movement of the lower die core 1 and the upper die core 7 in the vertical direction, ensuring the size of the cavity. After the T-ring 3 and the upper punch 5 move downward in place under the control of the forging equipment, the forging equipment controls the left horizontal punch 2 to move to extrude the lower die core 1, and at the same time controls the right horizontal moving punch 8 to move along the semi-circular inner cavity 11 to extrude the blank 15, forming the final closed-die state and completing the forging process.

[0023] S4. Die return and removal of the forging: The T-ring 3, the upper punch 5, the left horizontal punch 2, and the right horizontal moving punch 8 return under the action of the forging equipment, separating the upper die core 7 and the lower die core 1, removing the forging, and the forging is completed.

[0024] The present invention uses a multi-directional forging process to form elbow forgings. While retaining the inner hole forming of the forging, the size and shape of the forging are close to those of the part, the raw material utilization rate is high, the water inlet streamline in the overall forming process of the forging is complete, the forming quality of the forging is good, the comprehensive performance is excellent, and the service life of the forging is also improved.

[0025] The above are only the preferred embodiments of the present invention that can be implemented, and do not limit the scope of the rights of the present invention accordingly. All equivalent changes made by using the content of the specification and drawings of the present invention are included within the scope of the rights of the present invention.

Claims

1. A multi-directional die forging forming die for an elbow forging, characterized in that: It includes a T-shaped ring, an upper punch and a die core. A connecting plate is arranged at the top of the T-shaped ring. The upper punch is placed inside the T-shaped ring and connected to the connecting plate. The lower part of the T-shaped ring is matched with the die core. A cavity consistent with the outer shape of the elbow forging is arranged inside the die core. A left horizontal punch is arranged on the left side of the die core, and a right horizontal punch is arranged on the right side. The upper punch is used to form the inner hole in the vertical direction inside the elbow forging, and the right horizontal punch is used to form the inner hole in the horizontal direction inside the elbow forging.

2. The multi-directional die forging forming die for elbow forgings according to claim 1, wherein: The die core includes a lower die core and an upper die core, and the lower die core and the upper die core are connected by a guide post. The lower die core and the upper die core take the plane where the center line of the forging is located as the parting surface, and the cavity is divided into upper and lower two chambers by the parting surface.

3. The multi-directional die forging forming die for elbow forgings according to claim 2, wherein: The right horizontal punch includes a right horizontal fixed punch and a right horizontal movable punch. The cross-sections of the right horizontal fixed punch and the right horizontal movable punch are respectively semi-circular structures. A limit ring is arranged outside the right horizontal fixed punch. The limit ring is placed inside the cavity. The inner diameter of the limit ring is equal to the radius of the semi-circular cross-section of the right horizontal fixed punch. The limit ring forms a semi-circular inner cavity above the semi-circular cross-section. The right horizontal movable punch is adapted to the semi-circular inner cavity. A right punching hole adapted to the right horizontal movable punch is opened at the bottom end of the upper die core, and the right punching hole is communicated with the cavity. A left punching hole adapted to the left horizontal punch is opened on the left side of the lower die core.

4. The multi-directional die forging forming die for elbow forgings according to claim 3, characterized in that: Semicircular grooves are respectively arranged on the lower end surface of the T-shaped ring corresponding to the left horizontal punch and the right horizontal movable punch.

5. The multi-directional die forging forming die for elbow forgings according to claim 1, wherein: The left horizontal punch and the right horizontal punch are coaxially arranged.

6. A multi-directional die forging forming method for elbow forgings, characterized in that, It is applicable to the multi-directional die forging forming die of the elbow forging as described in any one of claims 1 to 5. The specific steps are as follows: S1. Install the die. S2. Preheat the die and heat the blank. S3. Forging. After the blank is taken out of the furnace, it is placed on the lower die core. The forging equipment controls the T-shaped ring and the upper punch to move downward to extrude the blank. After the upper die moves in place, the forging equipment controls the left horizontal punch to move to extrude the lower die core, and at the same time controls the right horizontal movable punch to move to extrude the blank to complete the forging process. S4. The die returns and the forging is taken out. The T-shaped ring, the upper punch, the left horizontal punch and the right horizontal movable punch return under the action of the forging equipment, and the forging is taken out to complete the forging.

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