Forging die and forging forming method for square pump body forging with special-shaped hole

Abstract

The present invention relates to a forging die, and in particular to a forging die for a square pump body forging with a special-shaped hole and a forging forming method, comprising a lower die assembly and an upper die assembly, wherein the lower die assembly comprises a lower die seat, a bottom die and a vertical lower ejector rod, and a side die one is symmetrically arranged inside the lower die groove, and a side die two is symmetrically arranged front and back; the upper die assembly comprises an upper die seat, a top die and a vertical upper ejector rod, and a side die three is symmetrically arranged inside the upper die groove, and a side die four is symmetrically arranged front and back; the side die one and the side die three are symmetrically arranged up and down, and the side die two and the side die four are symmetrically arranged up and down; a horizontal ejector rod is symmetrically arranged between the upper and lower die seats, and the bottom die, the top die, the side die one, the side die two, the side die three, the side die four, the vertical upper ejector rod and the horizontal ejector rod are molded together between the upper die seat and the lower die seat to form a mold cavity of the pump body forging. In the present invention, the die applies a deformation force to the blank in sequence according to the specified process action to form it, the metal flow is reasonable, the forging has high dimensional accuracy and good surface quality.

Description

Technical Field

[0001] The invention relates to a forging die, in particular to a forging die for a square pump body forging with a special-shaped hole and a forging forming method. Background Art

[0002] The special-shaped hole square pump body forgings are mainly used in the chemical, plastic, chemical fiber and other industries. They are an important part of the melt pump. The melt pump is mainly used for the transportation, pressurization and metering of high-temperature and high-viscosity polymer melts. It is a high-precision, high-speed and high-reliability equipment. The pump body is a square symmetrical structure, consisting of a square block, two independent vertical holes and an "8"-shaped symmetrical horizontal hole. The traditional forming methods of the special-shaped hole square pump body include casting and free forging and machining combined forming methods. Casting has the following significant disadvantages: low production efficiency, low performance, cannot meet the use requirements of long-term complex working conditions, and does not meet the overall needs of energy conservation and green development. The free forging and machining combined forming method has the following problems: the flow of materials during free forging is somewhat uncontrollable, so at least 30mm of margin needs to be reserved in each direction of the blank, and free forging can only forge blocks and cannot form inner holes, especially holes with complex structures. The hole volume of the square pump body with special-shaped holes accounts for 1 / 4-1 / 2 of the product volume. Therefore, the free forging material utilization rate is low, the manufacturing processes are many, the machining amount is large, and the manufacturing cost is high. At the same time, the forgings formed by free forging are unevenly deformed, the deformation of the core is small or almost non-deformed, resulting in low performance of the core, and the main position of the square pump body with special-shaped holes that bears temperature and pressure is in the core, so the product service life is greatly limited. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a forging die and a forging method for a square pump body forging with a special-shaped hole, so as to achieve the technical effects of reasonable metal flow, uniform deformation and high dimensional accuracy of the forging.

[0004] To achieve this technical purpose, the present invention adopts the following scheme:

[0005] A forging die for a square pump body forging with a special-shaped hole comprises a lower die assembly and an upper die assembly, wherein the lower die assembly comprises a lower die seat, a bottom die and a vertical lower ejector rod, wherein a lower die groove is provided on the upper surface of the lower die seat, the bottom die is placed in the lower die groove, and the top of the vertical lower ejector rod is inserted into the bottom of the lower die seat and contacts the bottom die; a side die 1 is symmetrically arranged in the lower and left and right sides of the lower die groove, and a side die 2 is symmetrically arranged in the front and back sides;

[0006] The upper mold assembly includes an upper mold base, a top mold and a vertical upper ejector rod. The upper mold base is connected to the lower mold base through a guide column. An upper mold groove is provided on the lower surface of the upper mold base. The top mold is placed in the upper mold groove. The lower part of the vertical upper ejector rod passes through the top of the upper mold base and the top mold in sequence. The inside of the upper mold groove is symmetrically provided with a side mold three and symmetrically provided with a side mold four.

[0007] Side mold one and side mold three are vertically symmetrically arranged, and side mold two and side mold four are vertically symmetrically arranged;

[0008] A horizontal push rod that runs through side die one and side die three is symmetrically arranged between the upper and lower die seats. The bottom die, the top die, the side die one, the side die two, the side die three, the side die four, the vertical upper push rod and the horizontal push rod are combined between the upper die seat and the lower die seat to form a die cavity of a square pump body forging with a special-shaped hole.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] The present invention adopts square billet, which is heated once, and the mold applies deformation force to the billet in sequence according to the specified process action to form it. The metal flow is reasonable, the deformation is uniform, and the structure is dense. The forging has high dimensional accuracy, good surface quality, and excellent mechanical properties. The production process is small, the efficiency is high, and energy is saved.

[0011] Further, the preferred embodiment of the present invention is:

[0012] The vertical upper ejector rod comprises a vertical connecting rod, and two vertical punches are arranged at the lower end of the vertical connecting rod; a clearance hole adapted to the two vertical punches is opened on the top die, and the vertical punches are slidably plugged with the top die through the clearance hole.

[0013] The horizontal push rod includes a horizontal connecting rod, on which a horizontal punch with an "8"-shaped cross-section is arranged. The upper surface of side mold one and the lower surface of side mold three are respectively provided with special-shaped grooves adapted to the surface of the horizontal punch. The curved surface on the upper surface of side mold one and the special-shaped groove on the lower surface of side mold three are combined to form an "8"-shaped horizontal hole adapted to the horizontal punch.

[0014] Positioning grooves are respectively provided on the inner walls of the lower mold groove and the upper mold groove, and positioning bosses are respectively provided on the outer side walls of the side mold one, the side mold two, the side mold three and the side mold four, and the positioning bosses are clamped with the positioning grooves.

[0015] The upper surface of side mold one and the lower surface of side mold three are respectively provided with a slot one, and after side mold one and side mold three are molded together, they are connected by a clamping block one placed in the two slots one; the upper surface of side mold two and the lower surface of side mold four are also respectively provided with a slot two, and after side mold two and side mold four are molded together, they are connected by a clamping block two placed in the two slots two.

[0016] An anti-rotation connecting block is arranged between the horizontal connecting rod and the horizontal punch, one end of the anti-rotation connecting block is connected to the horizontal connecting rod, and the other end is connected to the horizontal punch; the upper surface of the lower die base and the lower surface of the upper die base are respectively provided with anti-rotation grooves, and after the lower die base and the upper die base are closed, the two anti-rotation grooves form a through hole adapted to the anti-rotation connecting block.

[0017] A through slot is vertically opened in the middle of the bottom mold, and a lower ejector block is slidably connected in the through slot; a through hole is vertically opened in the middle of the lower mold base, and an ejector rod is slidably connected in the through hole, and the upper end of the ejector rod is connected to the lower ejector block.

[0018] The present invention also relates to a forging method for a square pump body forging with a special-shaped hole, which is carried out according to the following steps:

[0019] S1. Install the mold;

[0020] S2, mold preheating machine blank heating;

[0021] S3, forging, after the billet is taken out of the furnace and dephosphorized, it is immediately transferred to the lower die slot, and the forging equipment controls the two horizontal push rods to move in opposite directions to adjust the left and right positions of the billet; then the horizontal push rods move to the initial position; the upper die assembly and the lower die assembly are closed to slightly upset the billet; the vertical punch moves downward to extrude the billet, and finally the horizontal punch is aligned to extrude the billet to the final position to complete the forging process;

[0022] S4, the die returns and the forging is taken out. The horizontal punch, vertical punch and upper die assembly return in sequence under the action of the forging equipment, and then the forging is fixed by the lower ejector block to complete the forging.

[0023] All outer surfaces of the square pump body forgings with special-shaped holes produced by the forging forming process of the present invention have no draft angle, all processed surfaces have small margins and the outer shapes and inner holes are close to the outer shapes and sizes of the parts, and the raw material utilization rate is high; at the same time, the pump body forgings manufactured by the technology of the present invention have the advantages of dense structure, material saving, dense metal streamlines, long service life, etc., which can effectively improve the reliability and service life of the pump body and save operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the pump body forging structure;

[0025] Figure 2 It is a structural schematic diagram of the present invention;

[0026] Figure 3 for Figure 2 The main view;

[0027] Figure 4 for Figure 3 AA section view;

[0028] Figure 5 for Figure 2 Side view of

[0029] Figure 6 for Figure 5 BB cross-section diagram;

[0030] Figure 7 It is a schematic diagram of the internal mold closing of the upper mold base and the lower mold base;

[0031] Figure 8 It is a structural schematic diagram of the parting surface of the upper die base and the lower die base;

[0032] Fig. 9 It is a structural schematic diagram of the lower die base;

[0033] Fig.10 It is a structural schematic diagram of the upper die base;

[0034] Fig.11 It is a schematic diagram of the structure of side mold one and side mold three;

[0035] Fig.12 It is a schematic diagram of the structure of the side mold 2 and the side mold 4;

[0036] Fig.13 It is a schematic diagram of the structure of the top mold;

[0037] Fig.14 Schematic diagram of the structure of the bottom mold;

[0038] The markings in the figure are: 1. lower die seat; 101. lower die groove; 2. upper die seat; 201. upper die groove; 3. vertical upper ejector rod; 301. vertical connecting rod; 302. connecting block; 303. vertical punch; 4. horizontal ejector rod; 401. horizontal connecting rod; 402. anti-rotation connecting block; 403. horizontal punch; 5. vertical lower ejector rod; 6. bottom die; 7. lower ejector block; 8. side die one; 9. top die; 10. side die three; 11. blank; 12. side die two; 13. side die four; 14. positioning boss; 15. positioning groove; 16. clamping block one; 17. clamping groove one; 18. clamping block two; 19. clamping groove two; 20. curved groove; 21. special-shaped groove; 22. bayonet one; 23. bayonet two; 24. limiting boss. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of 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 violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0040] A forging die for a square pump body forging with a special-shaped hole is mainly composed of a lower die assembly and an upper die assembly. The upper die assembly consists of a lower die base 1, a bottom die 6 and a vertical lower ejector rod 5. A lower die groove 101 is opened on the upper surface of the lower die base 1, and the bottom die 6 is placed in the lower die groove 101.

[0041] A through groove is vertically opened in the middle of the bottom mold 6, and a lower ejector block 7 is slidably connected in the through groove; a through hole is also vertically opened in the middle of the lower mold base 1 at a position corresponding to the lower ejector block 7, and a vertical lower ejector rod 5 is slidably connected in the through hole, and the upper end of the vertical lower ejector rod 5 is connected to the lower ejector block 7, and the lower ejector block 7 can be lifted up by pushing the vertical lower ejector rod 5.

[0042] The upper mold assembly consists of an upper mold base 2, a top mold 9 and a vertical upper ejector rod 3. The four top corners of the upper mold base 2 are connected to the lower mold base 1 through guide rods respectively; an upper mold groove 201 is provided on the lower surface of the upper mold base 2, and the top mold 9 is placed in the upper mold groove 201; two clearance holes are vertically arranged in parallel in the middle of the top mold 9, and the vertical upper ejector rod 3 can penetrate the clearance holes and be slidably connected with the clearance holes.

[0043] Two side molds 1 8 are symmetrically arranged on the inner wall of the lower mold groove 101, and two side molds 2 12 are symmetrically arranged front to back. The interior of the upper mold groove 201 is symmetrically arranged with side mold 3 10, and side mold 4 13 is symmetrically arranged front to back. Side mold 1 8 and side mold 3 10 are symmetrically arranged up and down, and side mold 2 12 and side mold 4 13 are symmetrically arranged up and down.

[0044] Positioning grooves 15 are respectively provided on the inner walls of the lower mold groove 101 and the upper mold groove 201, and positioning bosses 14 are respectively provided on the outer walls of the side mold 18, the side mold 2 12, the side mold 3 10 and the side mold 4 13, and the positioning bosses 14 are clamped with the positioning grooves 15 in a one-to-one correspondence.

[0045] In this embodiment, the upper surface of the bottom mold 6 and the lower surface of the top mold 9 are respectively provided with limiting bosses 24, the bottom of the side mold 1 8 and the top of the side mold 3 10 are respectively provided with snap-fits 22, the snap-fits 22 at the bottom of the side mold 1 8 are snapped with the limiting boss 24 on the upper surface of the bottom mold 6, and the snap-fits 22 at the top of the side mold 3 10 are snapped with the limiting boss 24 on the lower surface of the top mold 9; the bottom of the side mold 2 12 and the top of the side mold 4 13 are respectively provided with snap-fits 23, the snap-fits 23 at the bottom of the side mold 2 12 are snapped with the limiting boss 24 on the bottom mold 6, and the snap-fits 23 at the top of the side mold 4 13 are snapped with the limiting boss 24 on the top mold 9.

[0046] The upper surface of the side mold 1 8 and the lower surface of the side mold 3 10 are respectively provided with a slot 17, and after the side mold 1 8 and the side mold 3 10 are molded together, they are connected by a block 16 placed in the two slots 17; the upper surface of the side mold 2 12 and the lower surface of the side mold 4 13 are also respectively provided with a slot 2 19, and after the side mold 2 12 and the side mold 4 13 are molded together, they are connected by a block 2 18 placed in the two slots 2 19.

[0047] A horizontal push rod 4 penetrating the side mold 1 8 and the side mold 3 10 is symmetrically arranged between the upper and lower mold bases 1. The horizontal push rod 4 consists of a horizontal connecting rod 401 and a horizontal punch 403. One end of the horizontal connecting rod 401 is connected to the forging equipment, and the other end is threadedly connected to an anti-rotation connecting block 402. The anti-rotation connecting block 402 is connected to the horizontal punch 403. The cross-section of the horizontal punch 403 is an "8"-shaped structure.

[0048] The upper surface of side mold 1 8 is provided with a special-shaped groove 21 adapted to the lower surface of the horizontal punch 403, and the lower surface of side mold 3 10 is provided with a special-shaped groove 21 adapted to the upper surface of the horizontal punch 403. After side mold 1 8 and side mold 2 12 are combined, the two special-shaped grooves 21 form an "8"-shaped horizontal hole adapted to the horizontal punch 403, and the horizontal punch 403 is slidably connected to the horizontal hole.

[0049] The upper surface of the lower mold base 1 is provided with a curved groove 20 adapted to the lower surface of the anti-rotation connecting block 402, and the lower surface of the upper mold base 2 is provided with a curved groove 20 adapted to the upper surface of the anti-rotation connecting block 402. After the upper and lower mold bases 1 are molded together, the two curved grooves 20 form an anti-rotation groove adapted to the anti-rotation connecting block 402, and the anti-rotation connecting block 402 is plugged into the anti-rotation groove.

[0050] The vertical upper push rod 3 is composed of a vertical connecting rod 301 and two vertical punches 303. One end of the vertical connecting rod 301 is connected to the forging equipment, and the other end is threadedly connected to a connecting block 302. Two vertical punches 303 are threadedly connected to the connecting block 302. The two vertical punches 303 pass through the clearance hole and are slidably connected to the clearance hole.

[0051] The bottom die 6, top die 9, side die one 8, side die two 12, side die three 10, side die four 13, vertical upper push rod 3 and horizontal push rod 4 are molded together between the upper die base 2 and the lower die base 1 to form a mold cavity of a square pump body forging with a special-shaped hole.

[0052] Based on the above forging die, the specific forging forming method is carried out according to the following steps:

[0053] S1. Install the mold: assemble the upper mold assembly and the lower mold assembly respectively, and connect the horizontal connecting rod 401 and the vertical connecting rod 301 to the corresponding positions of the forging equipment respectively; then fix the lower mold assembly on the forging workbench, turn over the upper mold assembly, and install it on the upper surface (i.e., the parting surface) of the lower mold assembly, and guide and connect the upper and lower mold bases 1 through the guide rods, then install the vertical punch 303 on the upper mold assembly, and then connect the vertical connecting rod 301 to the connecting block 302, that is, complete the connection between the vertical punch 303 and the forging equipment; finally, place the end of the horizontal punch 403 with the anti-rotation connecting block in the curved groove 20 of the lower mold base 1, and then rotate the horizontal connecting rod 401 to connect the horizontal punch 403 to the forging equipment; when installing the above mold, ensure the centering accuracy and positioning accuracy.

[0054] S2. Preheating of mold and heating of blank 11: The blank is square, and the length, width and height of the blank are 230mm×200mm×146mm. It is heated by a resistance furnace, and the heating temperature is 1180℃±20℃. The mold preheating temperature is not lower than 150℃ and the mold use temperature is controlled below 400℃.

[0055] S3, forging: after the blank 11 is taken out of the furnace and dephosphorized, it is immediately transferred to the groove of the lower die assembly. The forging equipment controls the two horizontal push rods 4 to move in opposite directions to adjust the left and right positions of the blank 11 to ensure the accuracy of the positioning of the blank 11; then the horizontal push rods 4 move to the initial position; the upper die assembly and the lower die assembly are molded together to slightly upset the blank 11; the vertical punch 303 moves downward to extrude the blank 11, and finally the horizontal punch 403 aligns and extrude the blank 11 to the final position to complete the forging process;

[0056] S4, die return and forging removal, the horizontal punch 403, vertical punch 303 and upper die assembly return in sequence under the action of the forging equipment, and then the forging is fixed by the lower ejector block 7, and the forging is completed, and the forging can be transferred.

[0057] The present invention adopts a one-fire-one-process forging forming method and a forming die to produce a square pump body forging with a special-shaped hole. The size and shape of the forging are close to those of the parts, and all outer surfaces have no draft angle. The utilization rate of raw materials is high, the machining time is short, the production efficiency is high, and the mold has strong versatility and is easy to replace, thereby reducing the mold cost.

[0058] Finally, it should be noted that the above are only preferred embodiments of the present invention. Of course, those skilled in the art can make changes and modifications to the present invention. If these modifications and variations fall within the scope of the claims of the present invention and their equivalent technologies, they should be considered to be within the scope of protection of the present invention.

Claims

1. A forging die for a square pump body forging with a special-shaped hole, characterized in that: The lower mold assembly comprises a lower mold base, a bottom mold and a vertical lower ejector rod. The upper surface of the lower mold base is provided with a lower mold groove, the bottom mold is placed in the lower mold groove, and the top of the vertical lower ejector rod is inserted into the bottom of the lower mold base and contacts with the bottom mold. The lower mold groove is provided with a side mold 1 symmetrically arranged on the left and right, and a side mold 2 symmetrically arranged on the front and back. The upper mold assembly includes an upper mold base, a top mold and a vertical upper ejector rod. The upper mold base is connected to the lower mold base through a guide column. An upper mold groove is provided on the lower surface of the upper mold base. The top mold is placed in the upper mold groove. The lower part of the vertical upper ejector rod passes through the top of the upper mold base and the top mold in sequence. The inside of the upper mold groove is symmetrically provided with a side mold three and symmetrically provided with a side mold four. Side mold one and side mold three are vertically symmetrically arranged, and side mold two and side mold four are vertically symmetrically arranged; A horizontal ejector rod penetrating the side mold 1 and the side mold 3 is symmetrically arranged between the upper and lower mold bases, and the bottom mold, the top mold, the side mold 1, the side mold 2, the side mold 3, the side mold 4, the vertical upper ejector rod and the horizontal ejector rod are molded together between the upper mold base and the lower mold base to form a mold cavity of a square pump body forging with a special-shaped hole; The horizontal push rod includes a horizontal connecting rod, on which a horizontal punch with an "8"-shaped cross section is arranged, and the upper surface of the side mold 1 and the lower surface of the side mold 3 are respectively provided with special-shaped grooves adapted to the surface of the horizontal punch, and the curved surface on the upper surface of the side mold 1 and the special-shaped groove on the lower surface of the side mold 3 are molded together to form an "8"-shaped horizontal hole adapted to the horizontal punch; The inner walls of the lower mold groove and the upper mold groove are respectively provided with positioning grooves, and the outer side walls of the side molds 1, 2, 3 and 4 are respectively provided with positioning bosses, which are engaged with the positioning grooves; The upper surface of the side mold 1 and the lower surface of the side mold 3 are respectively provided with a first card slot, and after the side mold 1 and the side mold 3 are molded together, they are connected by a first card block placed in the two first card slots; the upper surface of the side mold 2 and the lower surface of the side mold 4 are also respectively provided with a second card slot, and after the side mold 2 and the side mold 4 are molded together, they are connected by a second card block placed in the two second card slots; An anti-rotation connecting block is arranged between the horizontal connecting rod and the horizontal punch, one end of the anti-rotation connecting block is connected to the horizontal connecting rod, and the other end is connected to the horizontal punch; the upper surface of the lower die base and the lower surface of the upper die base are respectively provided with anti-rotation grooves, and after the lower die base and the upper die base are closed, the two anti-rotation grooves form a through hole adapted to the anti-rotation connecting block.

2. The forging die for a square pump body forging with a special-shaped hole according to claim 1, characterized in that: The vertical upper ejector rod comprises a vertical connecting rod, and two vertical punches are arranged at the lower end of the vertical connecting rod; a clearance hole adapted to the two vertical punches is opened on the top die, and the vertical punches are slidably plugged with the top die through the clearance hole.

3. The forging die for a square pump body forging with a special-shaped hole according to claim 2, characterized in that: A through slot is vertically opened in the middle of the bottom mold, and a lower ejector block is slidably connected in the through slot; a through hole is vertically opened in the middle of the lower mold base, and a vertical lower ejector rod is slidably connected in the through hole, and the upper end of the vertical lower ejector rod is connected to the lower ejector block.

4. A method for forging a square pump body forging with a special-shaped hole, characterized in that: The forging die for the square pump body forging with a special-shaped hole as claimed in claim 3 is used for forging and forming, and the steps are as follows: S1. Install the mold; S2, preheating the mold and heating the blank; S3, forging, after the billet is taken out of the furnace and dephosphorized, it is immediately transferred to the lower die slot, and the forging equipment controls the two horizontal push rods to move in opposite directions to adjust the left and right positions of the billet; then the horizontal push rods move to the initial position; the upper die assembly and the lower die assembly are closed to slightly upset the billet; the vertical punch moves downward to extrude the billet, and finally the horizontal punch is aligned to extrude the billet to the final position to complete the forging process; S4, the die returns and the forging is taken out. The horizontal punch, vertical punch and upper die assembly return in sequence under the action of the forging equipment, and then the forging is fixed by the lower ejector block to complete the forging.

Images