Stamping machining die for oil retainer of vertical pipeline pump and manufacturing process

Abstract

The invention discloses a stamping machining die for an oil retainer of a vertical pipeline pump, belongs to the technical field of manufacturing and production, and aims to solve the problems that the traditional turning machining of the oil retainer is time-consuming and low-efficiency, so that raw materials are wasted, the product quality is unstable, waste products are easy to generate, the assembly and operation of the pump are influenced, and the service life is shortened. The die comprises a composite blanking die and a stamping and calendaring forming die which are used in cooperation. Firstly, a raw material steel plate is subjected to blanking treatment through a composite blanking die, and after blanking is completed, the raw material steel plate is machined into a blank meeting the size requirement; and the primarily-machined blank is calendered through a stamping and calendering die, so that the blank meets the design size requirement, and finally the finished product structure of the oil retainer is formed.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical pressure processing, and in particular to a stamping processing die and a manufacturing process for an oil retaining ring of a vertical pipeline pump. Background Art

[0002] Vertical pipeline pump is a pipeline process pump with large output, which is widely used in the fields of petroleum industry, chemical industry, water supply and drainage, etc. The oil retainer ring is a fitting in the bearing housing assembly of the vertical pipeline pump. This part is a thin-walled special-shaped part. It is time-consuming and labor-intensive to process it by conventional turning machine, with low processing efficiency, serious waste of raw materials, and extremely unstable product processing quality. It cannot meet the design requirements, resulting in a large number of scrapped products, which restricts the assembly and delivery progress of the whole machine product. The defective oil retainer ring will affect the operation quality and service life of the pump after assembly and use. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a stamping die for an oil retaining ring of a vertical pipeline pump, comprising a composite blanking die and a stamping and calendering die used in conjunction with each other; The raw material steel plate is first punched through a composite punching die. After the punching is completed, the raw material steel plate is processed into a blank that meets the size requirements; The initially processed blank is then rolled through a stamping and rolling die to meet the design size requirements, ultimately forming a finished product structure of the oil retaining ring.

[0004] As a further improvement of the present invention, the composite punching die comprises an upper die base and a lower die base connected to each other; The upper die seat is used as the main body for punching reciprocating motion, and a guide sleeve, a first upper die and an upper die pressing plate are symmetrically installed below it from outside to inside. A groove is provided in the middle of the lower end of the upper die seat, and a pressing plate return spring is provided in the groove. A punching punch is provided below the pressing plate return spring. The upper end surface of the punching punch is sleeved with a pressing plate retaining ring and connected to the upper die seat, and the pressing plate retaining ring is in conflict with the pressing plate return spring. The lower die seat serves as the main body of the punching die base, and a guide rod, a supporting outer ring seat (13) and a first lower die are symmetrically installed on the upper side from the outside to the inside. A supporting outer ring guide positioning pin is arranged in the cavity of the supporting outer ring seat, and a guide positioning pin return spring and a supporting outer ring are arranged in sequence on the upper end surface of the supporting outer ring guide positioning pin. The supporting outer ring corresponds to the lower end surface of the first upper die. As a further improvement of the present invention, the upper die base and the lower die base are connected by a reciprocating mechanism; The reciprocating mechanism comprises a guide sleeve and a guide rod. A return spring is sleeved on the outer periphery of the guide rod, and the return spring is in contact with the guide sleeve.

[0005] As a further improvement of the present invention, both ends of the pressure plate retaining ring abut against the upper end notch of the upper die pressure plate, and the first upper die abuts against the lower end notch of the pressure plate retaining ring.

[0006] As a further improvement of the present invention, the lower end surface of the upper mold plate corresponds to the position of the first lower mold.

[0007] As a further improvement of the present invention, a cavity is provided in the lower die base.

[0008] As a further improvement of the present invention, the stamping and calendering die is a combined die consisting of an upper convex die and a lower concave die; The upper punch comprises a second upper die as an upper body, both sides of the second upper die are provided with mutually connected mold opening ejector pins and mold opening ejector pin springs, the protruding part of the second upper die is a guide column, and the lower end surface of the second upper die is a punch molding surface; The lower concave die includes a second lower die as the lower main body, one side of the second lower die is installed with an interconnected ejector pin and an ejector pin spring, a guide hole is provided in the middle of the second lower die, positioning stops are provided on both sides of the guide hole, and the upper end surface of the second lower die is the concave die molding surface.

[0009] As a further improvement of the present invention, the guide column of the upper punch can be embedded in the guide hole of the lower die.

[0010] As a further improvement of the present invention, a stamping manufacturing process for an oil retaining ring of a vertical pipeline pump is characterized in that it comprises the following steps: Step 1: Center the raw material steel plate on the lower die and the outer ring of the support; Step 2: Use a press machine to push the upper die seat down along the guide sleeve and guide column; Step 3: When the first upper die and the upper die pressing plate are attached to the raw material steel plate, the pressing plate retaining ring is stressed, driving the pressing plate return spring to compress; the upper die pressing plate stops and presses the finished product part of the oil retaining ring blank together with the first lower die; Step 4: The upper die seat continues to press down, the first upper die and the outer ring of the support work together to clamp the excess part of the outer circular contour of the blank, and cooperate with the first lower die to complete the cutting of the outer circular contour of the blank; the punching punch and the first lower die work together to complete the cutting of the inner hole of the blank; Step 5: After the punching and pressing movement is completed, release the pressure; Step 6: Under the rebound effect of the return spring, the upper die seat rises, and the first upper die, the upper die pressing plate, the punching punch and the contact parts of the lower die seat are separated; Step 7: Take out the processed finished blank; Step 8: Place the inner hole of the finished blank onto the positioning stop on the second lower die to ensure accurate positioning of the blank; Step 9: Place the complete set of oil retaining ring finished stamping and rolling dies on a mechanical press; Step 10: Push the upper die to perform a downward pressing movement to squeeze the die; Step 11: Under the action of pressure, the male die forming surface and the female die forming surface extrude and stretch the blank to form a finished product structure of the oil retaining ring; Step 12: Release the pressure, the mold opening ejector moves, lifts up the second upper mold, separates the second upper mold from the second lower mold, and opens the mold; Step 13: Press the ejector pin from the bottom of the second lower die to push out the finished oil retaining ring attached to the lower die and take it out. Beneficial effects of the present invention: 1. High production efficiency: The raw materials can be made into finished products through two steps of punching and stamping, eliminating the original cumbersome cutting process and the processing speed is fast.

[0011] 2. Good processing quality: the finished product size is uniform and the quality is stable.

[0012] 3. Reduce labor intensity: The mold structure design fully considers the convenience of the operation process, the various components are reasonably arranged, the processing process is simple to operate, and the labor intensity is reduced.

[0013] 4. Reduce production costs: reduce waste of raw materials, shorten processing time, and reduce manpower and material consumption in the processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a composite blanking die for a stamping die of an oil retaining ring of a vertical pipeline pump according to the present invention; Figure 2 It is a structural diagram of a stamping and rolling die of a stamping processing die for an oil retaining ring of a vertical pipeline pump of the present invention; Figure 3 The invention discloses a process flow chart of a stamping manufacturing process for an oil retaining ring of a vertical pipeline pump.

[0015] : 1. upper die seat, 2. lower die seat, 3. guide sleeve, 4. guide rod, 5. reset spring, 6. upper die, 7. upper die pressure plate, 8. pressure plate retaining ring, 9. punching punch, 10. pressure plate reset spring, 11. first lower die, 12. support outer ring, 13. support outer ring seat, 14. support outer ring guide locating pin, 15. guide locating pin reset spring, 16. second upper die, 17. second lower die, 18. mold opening ejector pin, 19. mold opening ejector pin spring, 20. stripping ejector pin, 21. stripping ejector pin spring, 22. guide column, 23. guide hole, 24. positioning stop, 25. punch forming surface, 26. die forming surface. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The embodiments described are given in the drawings. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0017] In this embodiment, the stamping die for the oil retaining ring of the vertical pipeline pump is used in conjunction with a universal mechanical press to achieve efficient stamping of the oil retaining ring.

[0018] like Figure 1 As shown, a stamping processing die for an oil retaining ring of a vertical pipeline pump includes a composite blanking die and a stamping and calendering forming die used in conjunction with each other.

[0019] The composite punching die is an integral punching die, which comprises an upper die base 1 and a lower die base 2 connected to each other; The upper die seat 1 is used as the main body for blanking reciprocating motion, and a guide sleeve 3, a first upper die 6 and an upper die pressing plate 7 are symmetrically installed below it from outside to inside. A groove is provided in the middle of the lower end of the upper die seat 1, and a pressing plate return spring 10 is provided in the groove. A punching punch 9 is provided below the pressing plate return spring 10. The upper end surface of the punching punch 9 is sleeved with a pressing plate retaining ring 8 and connected to the upper die seat 1, and the pressing plate retaining ring 8 is in conflict with the pressing plate return spring 10. The lower die base 2 serves as the main body of the blanking die base, and a cavity is arranged therein; in addition, a guide rod 4, a supporting outer ring seat 13 and a first lower die 11 are symmetrically installed above the lower die base 2 from the outside to the inside, and a supporting outer ring guide positioning pin 14 is arranged in the cavity of the supporting outer ring seat 13, and a guide positioning pin return spring 15 and a supporting outer ring 12 are arranged on the upper end surface of the supporting outer ring guide positioning pin 14 in sequence, and the supporting outer ring 12 corresponds to the lower end surface position of the first upper die 6, and the lower end surface of the upper die pressing plate 7 corresponds to the position of the first lower die 11.

[0020] The upper die base 1 and the lower die base 2 are connected by a reciprocating mechanism; the reciprocating mechanism includes a guide sleeve 3 and a guide rod 4, and a return spring 5 is sleeved on the outer periphery of the guide rod 4. The return spring 5 is in contact with the guide sleeve 3. Under the action of the return spring 5, the reciprocating mechanism realizes the reciprocating blanking motion of the upper die base 1 and controls the centering accuracy.

[0021] Both ends of the pressure plate retaining ring 8 abut against the upper end notch of the upper die pressure plate 7 , and the first upper die 6 abuts against the lower end notch of the pressure plate retaining ring 7 .

[0022] During the punching and pressing movement, the first upper die 6 and the supporting outer ring 12 work together to clamp the excess part of the outer circular contour of the oil retaining ring blank, and cooperate with the first lower die 11 to complete the cutting of the outer circular contour of the blank.

[0023] The upper die pressing plate 7 is a movable part on the upper die base 1. During the punching and pressing movement, it presses the finished part of the oil retaining ring blank together with the first lower die 11 to achieve accurate cutting of the blank.

[0024] The pressure plate retaining ring 8 is a movable part, which transmits the force of the pressure plate return spring 10 to the upper die pressure plate 7 during the punching and pressing movement.

[0025] The punching punch 9 cooperates with the first lower die 11 during the punching downward pressing movement to complete the cutting of the inner hole of the blank and push the waste material after punching into the inner cavity of the lower die base 2.

[0026] The pressure plate return spring 10 applies force to the pressure plate retaining ring 8 during the punching downward pressing movement to ensure that the finished part of the oil retaining ring blank is pressed tightly.

[0027] The supporting outer ring 12 is a movable part. When the blanking and pressing movement is performed, it cooperates with the first upper die 6 to clamp the redundant part of the outer circle contour of the oil retaining ring blank, so as to realize the precise cutting of the outer circle contour of the blank.

[0028] The support outer ring seat 13 positions the support outer ring guide positioning pin 14 and stops and limits the support outer ring 12 during the punching and pressing movement.

[0029] The guide positioning pin restoring spring 15 supports the support outer ring 12 through the support outer ring guide positioning pin 14 and realizes the restoring and removing of the material after the punching and pressing movement.

[0030] like Figure 2 As shown, the stamping and calendering die is a combined die consisting of an upper punch and a lower concave die, and is used to realize the dual processes of stamping and calendering.

[0031] The upper punch comprises a second upper die 16 as an upper main body, and both sides of the second upper die 16 are provided with mutually connected mold opening ejector pins 18 and mold opening ejector pin springs 19, the protruding portion of the second upper die 16 is a guide column 22, and the lower end surface of the second upper die 16 is a punch molding surface 25.

[0032] The lower concave die includes a second lower die 17 as a lower main body, one side of the second lower die 17 is installed with an ejector pin 20 and an ejector pin spring 21 that are connected to each other, a guide hole 23 is provided in the middle of the second lower die 17, positioning stops 24 are provided on both sides of the guide hole 23, and the upper end surface of the second lower die 17 is a concave die molding surface 26.

[0033] The guide pins 22 of the upper punch can be embedded in the guide holes 23 of the lower die.

[0034] The mold opening ejector pin 18 is a part of the upper mold 1 and is used to lift up the upper mold 1 after the stamping and stretching movement is completed, so as to subsequently open the mold and take out the finished product.

[0035] The mold opening ejector pin spring 19 is also a part of the second upper mold 16 and acts as an elastic element to act on the mold opening ejector pin to achieve a lifting action so that the mold can be opened.

[0036] The stripping ejector is a part of the second lower die 17. After the stamping is completed, the die is opened and the stripping ejector is pressed to push out the finished oil retaining ring attached to the forming surface of the concave die for easy removal.

[0037] The stripping ejector spring is a part of the second lower die 17, and serves as an elastic element, and its function is to help the stripping ejector to reset after the stripping ejector is ejected and the stripping is completed.

[0038] The guide pin 22 is a part of the second upper die 16 and is positioned in cooperation with the guide hole 23 for performing precise stamping and rolling operations on the blank.

[0039] The guide hole 23 is a part of the second lower die 17 and cooperates with the guide post 22 for positioning to ensure accurate alignment of the blank during the stamping and rolling process.

[0040] The positioning stop 24 is a part of the second lower die 17, which cooperates with the inner hole of the planar annular blank during loading to provide stable positioning for the blank.

[0041] The convex die forming surface 25 is a part of the second upper die 16 and cooperates with the concave die forming surface 26 to complete the stamping and rolling of the blank to ensure that the finished oil retaining ring meets the design size requirements.

[0042] The concave mold forming surface 26 is a part of the second lower mold 17, and cooperates with the convex mold forming surface 25 to jointly shape the blank to form a finished oil retainer ring structure that meets the design requirements.

[0043] After the preparation work is done, the stamping process for the oil baffle ring of the vertical pipeline pump using the aforementioned stamping die for the oil baffle ring of the vertical pipeline pump is carried out.

[0044] like Figure 3 As shown, a stamping manufacturing process for an oil retaining ring of a vertical pipeline pump includes the following steps: Step 1: Center the raw material steel plate on the lower die and the outer ring of the support; Step 2: Use a press machine to push the upper die seat down along the guide sleeve and guide column; Step 3: When the first upper die and the upper die pressing plate are attached to the raw material steel plate, the pressing plate retaining ring is stressed, driving the pressing plate return spring to compress; the upper die pressing plate stops and presses the finished product part of the oil retaining ring blank together with the first lower die; Step 4: The upper die seat continues to press down, the first upper die and the outer ring of the support work together to clamp the excess part of the outer circular contour of the blank, and cooperate with the first lower die to complete the cutting of the outer circular contour of the blank; the punching punch and the first lower die work together to complete the cutting of the inner hole of the blank; Step 5: After the punching and pressing movement is completed, release the pressure; Step 6: Under the rebound effect of the return spring, the upper die seat rises, and the first upper die, the upper die pressing plate, the punching punch and the contact parts of the lower die seat are separated; Step 7: Take out the processed finished blank; Step 8: Place the inner hole of the finished blank onto the positioning stop on the second lower die to ensure accurate positioning of the blank; Step 9: Place the complete set of oil retaining ring finished stamping and rolling dies on a mechanical press; Step 10: Push the upper die to perform a downward pressing movement to squeeze the die; Step 11: Under the action of pressure, the male die forming surface and the female die forming surface extrude and stretch the blank to form a finished product structure of the oil retaining ring; Step 12: Release the pressure, the mold opening ejector moves, lifts up the second upper mold, separates the second upper mold from the second lower mold, and opens the mold; Step 13: Press the ejector pin from the bottom of the second lower die to push out the finished oil retaining ring attached to the lower die and take it out.

[0045] When performing the compound punching process of the oil retaining ring, after ensuring that the size of the blank is qualified, the compound punching die is installed on a general hydraulic or mechanical press. Center the 0.5mm thick square steel plate raw material on the lower die 11 and the support outer ring 12. Before starting the press, make sure that all safety measures are in place. Turn on the press and push the upper die seat 1 to press down along the guide sleeve 3 and the guide column 4. At this time, the reset spring 5 is compressed. When the first upper die 6 and the upper die plate 7 are attached to the raw material steel plate, the plate retaining ring 8 is subjected to force, driving the plate reset spring 10 to compress. The upper die plate 7 stops and presses the finished part of the oil retaining ring blank together with the first lower die 11. The upper die seat 1 continues to press down, and the first upper die 6 and the support outer ring 12 work together to clamp the excess part of the outer circular contour of the oil retaining ring blank, and cooperate with the first lower die 11 to complete the cutting of the outer circular contour of the blank. At the same time, the support outer ring 12 moves downward, pushing the waste material downward. The punching punch 9 works together with the first lower die 11 to complete the cutting of the inner hole of the blank. The punching punch 9 pushes the waste material after punching into the inner cavity of the lower die seat 2, and pushes the support outer ring 12 to the support outer ring seat 13 to limit. After the punching and pressing movement is completed, operate the press to release the pressure. Under the rebound action of the reset spring 5, the upper die seat 1 rises, and the first upper die 6, the upper die plate 7, the punching punch 9 and the lower die seat 2 are separated from each other. Under the rebound action of the guide positioning pin reset spring 15, the support outer ring 12 is reset, and the excess waste material of the outer circular contour of the blank is pushed out. After the reset stops, confirm the safety state, clean up the waste material, and take out the processed finished blank. Subsequently, the oil retaining ring finished stamping and calendering mold is used for subsequent finished product processing.

[0046] When stamping and rolling the oil retaining ring, ensure that the blank size is qualified and proceed as follows: Take a qualified annular blank and place its inner hole on the positioning stop 24 on the second lower die 17 to ensure that the blank is accurately positioned. Insert the guide post 22 of the first upper die 16 into the guide hole 23 of the second lower die 17 to complete the assembly of the die. Place the entire set of finished stamping and rolling dies for the oil retaining ring on a general hydraulic or mechanical press. Before starting the press, conduct a safety check to ensure that all safety measures are in place. Turn on the press and push the upper die to perform a downward movement to extrude the die. Under the action of the press, the convex die forming surface 25 and the concave die forming surface 26 extrude and stretch the blank to form the finished structure of the oil retaining ring. After the extrusion is completed, operate the press to release the pressure. After confirming the safety state again, separate the die from the press. At the same time, the mold opening ejector 18 moves to lift the second upper die 16 and disengage the second upper die 16 from the second lower die 17. Completely separate the second upper die 16 from the second lower die 17 and open the die. After opening the mold, the stripping ejector rod 20 is pressed from the bottom of the second lower mold 17 to move, and the oil retaining ring finished product attached to the lower mold is pushed out and taken out. So far, the processing of the oil retaining ring is completed.

[0047] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A stamping die for an oil retaining ring of a vertical pipeline pump, characterized in that: Including a composite punching die and a stamping and calendering die used in conjunction with each other; The raw material steel plate is first punched through a composite punching die. After the punching is completed, the raw material steel plate is processed into a blank that meets the size requirements; The initially processed blank is then rolled through a stamping and rolling die to meet the design size requirements, ultimately forming a finished product structure of the oil retaining ring.

2. The stamping die for the oil retaining ring of a vertical pipeline pump according to claim 1, characterized in that: The composite punching die comprises an upper die base (1) and a lower die base (2) which are connected to each other; The upper die seat (1) serves as a main body for punching reciprocating motion, and a guide sleeve (3), a first upper die (6) and an upper die pressing plate (7) are symmetrically installed below the upper die seat (1) from the outside to the inside. A groove is provided in the middle of the lower end of the upper die seat (1), and a pressing plate return spring (10) is provided in the groove. A punching punch (9) is provided below the pressing plate return spring (10). The upper end surface of the punching punch (9) is sleeved with a pressing plate retaining ring (8) and is connected to the upper die seat (1), and the pressing plate retaining ring (8) is in contact with the pressing plate return spring (10). The lower die seat (2) serves as the main body of the punching die base, and a guide rod (4), a material supporting outer ring seat (13) and a first lower die (11) are symmetrically installed on the upper side from the outside to the inside. A material supporting outer ring guide positioning pin (14) is arranged in the cavity of the material supporting outer ring seat (13), and a guide positioning pin return spring (15) and a material supporting outer ring (12) are arranged in sequence on the upper end surface of the material supporting outer ring guide positioning pin (14). The material supporting outer ring (12) corresponds to the lower end surface of the first upper die (6).

3. The stamping die for the oil retaining ring of a vertical pipeline pump according to claim 2, characterized in that: The upper die base (1) and the lower die base (2) are connected via a reciprocating mechanism; The reciprocating mechanism comprises a guide sleeve (3) and a guide rod (4); a return spring (5) is sleeved on the outer periphery of the guide rod (4); and the return spring (5) is in contact with the guide sleeve (3).

4. The stamping die for the oil retaining ring of a vertical pipeline pump according to claim 2, characterized in that: Both ends of the pressure plate retaining ring (8) abut against the upper end notch of the upper die pressure plate (7), and the first upper die (6) abuts against the lower end notch of the pressure plate retaining ring (7).

5. The stamping die for the oil retaining ring of a vertical pipeline pump according to claim 2, characterized in that: The lower end surface of the upper die pressing plate (7) corresponds to the position of the first lower die (11).

6. The stamping die for the oil retaining ring of a vertical pipeline pump according to claim 2, characterized in that: A cavity is provided in the lower die base (2).

7. The stamping die for the oil retaining ring of a vertical pipeline pump according to claim 1, characterized in that: The stamping and calendering die is a combined die consisting of an upper convex die and a lower concave die; The upper punch comprises a second upper die (16) as an upper body, and mutually connected die opening ejector pins (18) and die opening ejector pin springs (19) are installed on both sides of the second upper die (16), the protruding portion of the second upper die (16) is a guide column (22), and the lower end surface of the second upper die (16) is a punch molding surface (25); The lower concave die comprises a second lower die (17) as a lower body, a stripping ejector pin (20) and a stripping ejector pin spring (21) which are connected to each other are installed on one side of the second lower die (17), a guide hole (23) is provided in the middle of the second lower die (17), positioning stops (24) are provided on both sides of the guide hole (23), and the upper end surface of the second lower die (17) is a concave die molding surface (26).

8. The stamping die for the oil retaining ring of a vertical pipeline pump according to claim 7, characterized in that: The guide column (22) of the upper punch can be embedded in the guide hole (23) of the lower die.

9. A stamping manufacturing process for an oil retaining ring of a vertical pipeline pump, characterized in that: The following steps are involved: Step 1: Center the raw material steel plate on the lower die and the outer ring of the support; Step 2: Use a press machine to push the upper die seat down along the guide sleeve and guide column; Step 3: When the first upper die and the upper die pressing plate are attached to the raw material steel plate, the pressing plate retaining ring is stressed, driving the pressing plate return spring to compress; the upper die pressing plate stops and presses the finished product part of the oil retaining ring blank together with the first lower die; Step 4: The upper die seat continues to press down, the first upper die and the outer ring of the support work together to clamp the excess part of the outer circular contour of the blank, and cooperate with the first lower die to complete the cutting of the outer circular contour of the blank; the punching punch and the first lower die work together to complete the cutting of the inner hole of the blank; Step 5: After the punching and pressing movement is completed, release the pressure; Step 6: Under the rebound effect of the return spring, the upper die seat rises, and the first upper die, the upper die pressing plate, the punching punch and the contact parts of the lower die seat are separated; Step 7: Take out the processed finished blank; Step 8: Place the inner hole of the finished blank onto the positioning stop on the second lower die to ensure accurate positioning of the blank; Step 9: Place the complete set of oil retaining ring finished stamping and rolling dies on a mechanical press; Step 10: Push the upper die to perform a downward pressing movement to squeeze the die; Step 11: Under the action of pressure, the male die forming surface and the female die forming surface extrude and stretch the blank to form a finished product structure of the oil retaining ring; Step 12: Release the pressure, the mold opening ejector moves, lifts up the second upper mold, separates the second upper mold from the second lower mold, and opens the mold; Step 13: Press the ejector pin from the bottom of the second lower die to push out the finished oil retaining ring attached to the lower die and take it out.

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