A forging die and process for a high pressure piston

Abstract

The application discloses a forging die and process of a high-pressure piston, which comprises an upper die plate and a lower die plate, a upper die sleeve is installed at the center of the upper die plate, a cover plate is arranged above the upper die sleeve, an upper material removing ring is arranged in the upper die sleeve, an upper sliding block is arranged in the upper material removing ring, a upper die core is arranged below the upper material removing ring, the upper die core is wrapped with a upper die ring, a lower die sleeve is installed at the center of the lower die plate, a lower die pressing ring is arranged at the upper end of the lower die sleeve, a base, a lower material removing ring, a lower cushion block and a lower die are arranged in the lower die sleeve; when forging starts, a blank is put into the groove of the lower die, the blank is extruded into the shape of a product by the upper die core, the upper die plate and the lower die plate are designed as an ejection structure, a little draft is added to the outer circle of the upper die and the position of the inner hole, and as long as the ejector rod is ejected, the product will automatically fall off, so that the problems of large stroke, deep inner cavity, difficult design of the die, limited ejection stroke, inconvenient product demolding and the like of the prior art are solved.

Description

Technical Field

[0001] This invention relates to the field of high-pressure piston forging technology, specifically to a forging mold and process for a high-pressure piston. Background Technology

[0002] High-pressure pistons, due to their high mechanical performance requirements and large longitudinal dimensions, place high demands on the fit and design of the molds. The existing forging process for high-pressure pistons generally involves: before forging, the aluminum alloy needs to be preheated appropriately to improve its plasticity and forgeability, making it easier to form the piston shape; the preheated aluminum alloy is then placed in a forging machine for high-pressure forging, shaping the alloy into the piston shape through impact and extrusion. Careful control of parameters such as forging temperature and pressure is crucial at this stage; after forging, the piston needs cooling to lower its temperature and strengthen its structure. This can be achieved through water quenching, air cooling, etc.; after forging and cooling, the piston requires precision machining, including turning, milling, and grinding, to ensure its accuracy and surface quality. However, existing forged high-pressure piston molds have disadvantages such as large strokes, deep internal cavities, difficult mold design, limited ejection stroke, and inconvenient product demolding. Summary of the Invention

[0003] The purpose of this invention is to provide a forging mold and process for a high-pressure piston. By adding a draft angle to the outer circle and inner hole of the upper die, the product will automatically fall off as soon as the ejector rod is ejected, thus solving the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A forging die for a high-pressure piston includes an upper die plate and a lower die plate, which are connected by a guide sleeve and a guide post. An upper die sleeve is installed at the center of the upper die plate, and a cover plate is provided above the upper die sleeve. An upper ejector ring is provided inside the upper die sleeve, and an upper pad is provided between the upper ejector ring and the cover plate. An upper sliding block is provided inside the upper ejector ring, and an upper die core is provided below the upper ejector ring. The upper die core is wrapped around the upper die ring, and the upper die ring is connected to the upper die sleeve by an upper threaded sleeve. A lower mold sleeve is installed at the center of the lower template. A lower mold pressure ring is provided at the upper end of the lower mold sleeve. The interior of the lower mold sleeve is provided with a base, a lower ejector ring, a lower pad block, and a lower mold. A lower mold fixing ring is provided on the outside of the lower mold and is connected to the lower mold pressure ring. The lower mold passes through the lower pad block and the lower sliding block, and the lower ejector ring is wrapped around the outside of the lower sliding block. A push rod is connected to the bottom of the lower mold and passes through the base.

[0005] Preferably, the upper mold core and the lower mold are located on the same axis.

[0006] Preferably, there is a draft angle of 2-5 between the lower edge of the upper mold ring and the upper mold core.

[0007] Preferably, the movement states of both the upper and lower sliding blocks are controlled by hydraulic cylinders.

[0008] Preferably, an ejector pin is connected through the upper sliding block, and the ejector pin passes through the upper mold core and slides with it.

[0009] Preferably, both the upper mold sleeve and the lower mold sleeve are fixed by bolts.

[0010] This invention provides another technical solution: a forging process for a forging die for a high-pressure piston, comprising the following steps: S1: Place the blank into the groove of the lower mold. After starting, the upper mold plate moves along the guide sleeve and guide post to the lower mold plate. S2: The upper die core is pressed down into the lower die to extrude the blank into the shape of the product; S3: The upper template is lifted, and the product is carried out of the lower mold along with the upper mold core; S4: The upper sliding block is pushed out by the oil cylinder in the upper template, which in turn drives the ejector pin in the center to push the product out of the mold cavity and the product falls down.

[0011] Compared with the prior art, the beneficial effects of the present invention are: The forging mold and process for the high-pressure piston of the present invention involves placing the blank into the groove of the lower mold at the start of forging. After starting, the upper mold frame moves down, and the upper mold core extrudes the blank into the shape of the product. Then, the upper mold is lifted, and the product is carried out of the lower mold along with the upper mold core. The ejector cylinder on the equipment ejects the product, driving the ejector rod at the center of the upper mold frame to eject the product out of the mold cavity. The product falls down. Through the design of the mold, the upper and lower mold plates are set as ejector structures. Since the longitudinal dimension of the high-pressure piston product is large and the ejection stroke is large, the present invention adds a draft angle to the outer circle and inner hole of the upper mold. As soon as the ejector rod ejects, the product will fall automatically, thereby solving the problems of large stroke, deep inner cavity, difficult mold design, limited ejection stroke, and inconvenient product demolding of existing molds. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the upper mold core structure of the present invention; Figure 3 This is a schematic diagram of the lower mold structure of the present invention.

[0013] In the diagram: 1. Upper template; 2. Upper mold sleeve; 3. Guide sleeve and guide post; 4. Upper screw sleeve; 5. Lower mold pressure ring; 6. Lower mold sleeve; 7. Lower template; 8. Base; 9. Ejector rod; 10. Lower sliding block; 11. Lower ejector ring; 12. Lower pad block; 13. Lower mold fixing ring; 14. Upper mold ring; 15. Upper sliding block; 16. Upper ejector ring; 17. Upper pad block; 18. Cover plate; 19. Lower mold; 20. Upper mold core. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Please see Figure 1-3 This invention provides a forging mold for a high-pressure piston, including an upper mold plate 1 and a lower mold plate 7, which are connected by a guide sleeve and a guide post 3. An upper mold sleeve 2 is installed at the center of the upper mold plate 1, and a cover plate 18 is provided above the upper mold sleeve 2. An upper ejector ring 16 is provided inside the upper mold sleeve 2, and an upper pad block 17 is provided between the upper ejector ring 16 and the cover plate 18. An upper sliding block 15 is provided inside the upper ejector ring 16, and an upper mold core 20 is provided below the upper ejector ring 16. The upper mold core 20 is wrapped with an upper mold ring 14, which is connected to the upper mold sleeve 2 by an upper threaded sleeve 4. There is a draft angle of 2-5 between the lower edge of the upper mold ring 14 and the upper mold core 20, so that the product will fall off automatically when the ejector pin is ejected.

[0016] In this embodiment, a lower die sleeve 6 is installed at the center of the lower template 7. A lower die pressure ring 5 is provided at the upper end of the lower die sleeve 6. The lower die sleeve 6 is provided with a base 8, a lower ejector ring 11, a lower pad block 12, and a lower die 19. A lower die fixing ring 13 is provided on the outside of the lower die 19, and the lower die fixing ring 13 is connected to the lower die pressure ring 5. The lower die 19 passes through the lower pad block 12 and the lower sliding block 10, and the lower ejector ring 11 is wrapped around the outside of the lower sliding block 10. The bottom of the lower die 19 is connected to a push rod 9, which passes through the base 8. The upper die core 20 and the lower die 19 are located on the same axis. The blank in the lower die 19 is stamped by the downward movement of the upper die core 20.

[0017] In the above embodiment, the upper mold sleeve 2 and the lower mold sleeve 6 are both fixed by bolts, and the movement states of the upper sliding block 15 and the lower sliding block 10 are both controlled by hydraulic cylinders. A ejector pin is connected through the upper sliding block 15, and the ejector pin is inserted into the upper mold core 20 and slides with it. As soon as the ejector pin is ejected, the product will fall off automatically.

[0018] To further explain the embodiments of the present invention, a forging process for a forging die for a high-pressure piston is also provided, including the following steps: Step 1: Place the blank into the groove of the lower mold 19. After starting, the upper mold plate 1 moves along the guide sleeve and guide post 3 to the lower mold plate 7. Step 2: The upper mold core 20 is pressed down into the lower mold 19 to extrude the blank into the shape of the product; Step 3: The upper mold plate 1 is lifted, and the product is brought out of the lower mold 19 along with the upper mold core 20; Step 4: The oil cylinder inside the upper mold plate 1 drives the upper sliding block 15 to push out, thereby driving the ejector pin at the center to push the product out of the mold cavity, and the product falls down.

[0019] In summary, the present invention provides a forging mold and process for a high-pressure piston. Through mold design, the upper mold plate 1 and the lower mold plate 7 are designed as ejection structures. Since the longitudinal dimension of the high-pressure piston product is large and the ejection stroke is large, the present invention avoids designing based on the maximum stroke. A draft angle is added to the outer circle and inner hole of the upper mold. As soon as the ejector rod is ejected, the product will automatically fall off, thereby solving the problems of large stroke, deep internal cavity, difficult mold design, limited ejection stroke, and inconvenient product demolding of existing molds.

[0020] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A forging die for a high-pressure piston, characterized in that, Includes an upper template (1) and a lower template (7), connected by a guide sleeve and guide post (3); an upper mold sleeve (2) is installed at the center of the upper template (1), a cover plate (18) is provided above the upper mold sleeve (2), an upper ejector ring (16) is provided inside the upper mold sleeve (2), and an upper pad block (17) is provided between the upper ejector ring (16) and the cover plate (18); an upper sliding block (15) is provided inside the upper ejector ring (16), and the upper sliding block (15) is in motion... The state is controlled by an oil cylinder set in the upper template (1); an ejector pin is connected through the upper sliding block (15), the ejector pin is inserted into the upper mold core (20) and slides with it; the upper mold core (20) is provided below the upper ejector ring (16), the upper mold core (20) is wrapped with the upper mold ring (14), the upper mold ring (14) is connected to the upper mold sleeve (2) through the upper screw sleeve (4), and there is a draft angle of 2-5 between the lower edge of the upper mold ring (14) and the upper mold core (20); A lower mold sleeve (6) is installed at the center of the lower template (7). A lower mold pressure ring (5) is provided at the upper end of the lower mold sleeve (6). The lower mold sleeve (6) is provided with a base (8), a lower ejector ring (11), a lower pad block (12) and a lower mold (19). A lower mold fixing ring (13) is provided on the outside of the lower mold (19). The lower mold fixing ring (13) is connected to the lower mold pressure ring (5). The lower mold (19) passes through the lower pad block (12) and the lower sliding block (10). The lower ejector ring (11) is wrapped around the outside of the lower sliding block (10). A top rod (9) is connected to the bottom of the lower mold (19). The top rod (9) passes through the base (8).

2. The forging die for a high-pressure piston as described in claim 1, characterized in that: The upper mold core (20) and the lower mold (19) are located on the same axis.

3. The forging die for a high-pressure piston as described in claim 1, characterized in that: The movement states of the upper sliding block (15) and the lower sliding block (10) are both controlled by the hydraulic cylinder.

4. The forging die for a high-pressure piston as described in claim 1, characterized in that: Both the upper mold sleeve (2) and the lower mold sleeve (6) are fixed by bolts.

5. A forging process for a forging die for a high-pressure piston as described in claim 1, characterized in that, Includes the following steps: S1: Place the blank into the groove of the lower mold (19). After starting, the upper mold plate (1) moves along the guide sleeve and guide post (3) to the lower mold plate (7). S2: The upper mold core (20) is pressed down into the lower mold (19) to squeeze the blank into the shape of the product. S3: The upper mold plate (1) is lifted up, and the product is taken out of the lower mold (19) along with the upper mold core (20). S4: The oil cylinder in the upper mold plate (1) drives the upper sliding block (15) to push out, thereby driving the ejector pin at the center to push the product out of the mold cavity, and the product falls down.

Images