Piston forging die

Abstract

The utility model discloses a piston forging die which comprises an upper die frame and a lower die frame, an upper die core and a lower die core are arranged in a first press-in groove and a second press-in groove respectively, die cavities are formed in the surface of the upper die core and the surface of the lower die core respectively, and a plurality of first limiting rods and a plurality of second limiting rods are arranged on the surface of the bottom end of the upper die core and the surface of the bottom end of the lower die core respectively. The first press-in groove is internally provided with first limiting grooves which are matched with the first limiting rods and have the same number as the first limiting rods, and the second press-in groove is internally provided with second limiting grooves which are matched with the second limiting rods and have the same number as the second limiting rods. According to the piston forging die, the alignment marks arranged on the die frame and the die core help a worker to align when the die core is pressed in, so that the die core is prevented from shifting before being pressed in; and the limiting rod at the bottom end of the mold core is inserted into the limiting groove in the press-in groove before being pressed in, so that the mold core is prevented from deviating when being pressed in, and the mold is prevented from being scrapped due to the deviation of the mold core.

Description

Technical Field

[0001] The utility model relates to the field of piston processing, and particularly relates to a piston forging die. Background Technique

[0002] A piston is a reciprocating part in a cylinder block of an automobile engine. The basic structure of a piston can be divided into a top part, a head part and a skirt part. The top part of the piston is the main part forming the combustion chamber, and its shape is related to the selected combustion chamber form. Gasoline engines mostly use flat-top pistons, and their advantage is small heat absorption area. The top part of a diesel piston often has various pits, and its specific shape, position and size must all meet the requirements of the formation and combustion of the air-fuel mixture in the diesel engine.

[0003] A forged piston is formed by forging a metal block in a die through a forging machine, and the forging die consists of a die holder and a die core. The die core is usually forced into the die holder through the tolerance between them to achieve the purpose of combining the die core and the die holder. However, when pressing in using the existing method, the die core may shift during the pressing process, and it is almost impossible to separate the die core from the die holder without damage after the die core is pressed into the die holder. Therefore, once it shifts, the die will be scrapped. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a piston forging die.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A piston forging die of the utility model includes an upper die holder and a lower die holder. The opposite surfaces of the upper die holder and the lower die holder are respectively provided with a boss and a groove. First pressing grooves and second pressing grooves are respectively opened on the surfaces of the boss and the groove. An upper die core and a lower die core are respectively arranged in the first pressing groove and the second pressing groove. Die cavities are respectively opened on the surfaces of the upper die core and the lower die core. A plurality of first limiting rods and a plurality of second limiting rods are respectively arranged on the bottom end surfaces of the upper die core and the lower die core. First limiting grooves which are adapted to and have the same number as the first limiting rods are arranged in the first pressing groove. Second limiting grooves which are adapted to and have the same number as the second limiting rods are arranged in the second pressing groove.

[0007] As a preferred technical solution of the utility model, a first inner alignment mark is arranged on the top end surface of the upper die core, and a first outer alignment mark which is aligned with the first inner alignment mark is arranged on the surface of the boss.

[0008] As a preferred technical solution of the utility model, a second inner alignment mark is arranged on the top end surface of the lower die core, and a second outer alignment mark which is aligned with the second inner alignment mark is arranged on the surface of the groove.

[0009] As a preferred technical solution of the present utility model, the number of the first limiting rods and the second limiting rods is four each.

[0010] As a preferred technical solution of the present utility model, fixing card slots and fixing screw holes are provided on the side walls of the upper mold base and the lower mold base.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The alignment marks provided on the mold base and the mold core help workers to align when pressing the mold core, so as to prevent the mold core from shifting before being pressed in; the limiting rods at the bottom end of the mold core are inserted into the limiting slots in the pressing slots before being pressed in, so as to prevent the mold core from shifting when being pressed in, thereby preventing the mold from being scrapped due to the shift of the mold core. Description of the Drawings

[0013] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0014] Figure 1 is the overall structural schematic diagram of the present utility model;

[0015] Figure 2 is one of the split diagrams of the overall structure of the present utility model;

[0016] Figure 3 is the other split diagram of the overall structure of the present utility model;

[0017] Figure 4 is the cross-sectional structural schematic diagram of the present utility model;

[0018] In the figure: 1. upper mold base; 2. lower mold base; 3. upper mold core; 4. lower mold core; 5. convex platform; 6. groove; 7. first pressing slot; 8. second pressing slot; 9. mold cavity; 10. first limiting rod; 11. second limiting rod; 12. first limiting slot; 13. second limiting slot; 14. first inner alignment mark; 15. first outer alignment mark; 16. second inner alignment mark; 17. second outer alignment mark; 18. fixing card slot; 19. fixing screw hole. Detailed Embodiments

[0019] The following is a description of the preferred embodiments of the present utility model with reference to the drawings. It should be understood that the preferred embodiments described herein are only for explaining and illustrating the present utility model, and are not used to limit the present utility model.

[0020] Among them, the same reference numerals in the drawings all refer to the same components.

[0021] Such as Figures 1-4As shown in the figure, the utility model provides a piston forging die, which includes an upper die holder 1 and a lower die holder 2. On the opposite surfaces of the upper die holder 1 and the lower die holder 2, there are respectively a boss 5 and a groove 6. On the surfaces of the boss 5 and the groove 6, there are respectively a first press-in groove 7 and a second press-in groove 8. An upper die core 3 and a lower die core 4 are respectively arranged in the first press-in groove 7 and the second press-in groove 8. Mold cavities 9 are respectively arranged on the surfaces of the upper die core 3 and the lower die core 4. On the bottom end surfaces of the upper die core 3 and the lower die core 4, there are respectively multiple first limiting rods 10 and multiple second limiting rods 11. In the first press-in groove 7, there is a first limiting groove 12 that is adapted to and has the same number as the first limiting rods 10. In the second press-in groove 8, there is a second limiting groove 13 that is adapted to and has the same number as the second limiting rods 11.

[0022] In this embodiment, the upper die holder 1 is installed at the output end inside the forging machine, and the lower die holder 2 is installed on the platform inside the forging machine. The boss 5 and the groove 6 are adapted to each other. When the upper die holder 1 presses down, the boss 5 will insert into the groove 6 to prevent misalignment between the two dies and improve the precision of forging the piston. The upper die core 3 is placed in the first press-in groove 7, and the first limiting rods 10 at its bottom end are inserted into the first limiting grooves 12 in the first press-in groove 7. Then, the upper die core 3 is pressed in to combine the upper die core 3 with the upper die holder 1. The lower die core 4 is placed in the second press-in groove 8, and the second limiting rods 11 at its bottom end are inserted into the second limiting grooves 13 in the second press-in groove 8. Then, the lower die core 4 is pressed in to combine the lower die core 4 with the lower die holder 2.

[0023] Furthermore, on the top end surface of the upper die core 3, there is a first inner alignment mark 14, and on the surface of the boss 5, there is a first outer alignment mark 15 that is aligned with the first inner alignment mark 14.

[0024] In this embodiment, when the worker places the upper die core 3 into the first press-in groove 7, the first inner alignment mark 14 on the upper die core 3 is aligned with the first outer alignment mark 15 on the surface of the boss 5 to prevent the upper die 3 from shifting during placement.

[0025] Furthermore, on the top end surface of the lower die core 4, there is a second inner alignment mark 16, and on the surface of the groove 6, there is a second outer alignment mark 17 that is aligned with the second inner alignment mark 16.

[0026] In this embodiment, when the worker places the lower die core 4 into the second press-in groove 8, the second inner alignment mark 16 on the lower die core 4 is aligned with the second outer alignment mark 17 on the surface of the groove 6 to prevent the lower die core 4 from shifting during placement.

[0027] Furthermore, the number of both the first limiting rods 10 and the second limiting rods 11 is four.

[0028] Furthermore, on the side walls of both the upper die holder 1 and the lower die holder 2, there are respectively fixed clamping grooves 18 and fixed screw holes 19.

[0029] In this embodiment, the upper die holder 1 and the lower die holder 2 are installed on the forging machine through the fixed card slots 18 and the fixed screw holes 19.

[0030] The utility model is a piston forging die. The alignment marks provided on the die holder and the die core help workers to align when the die core is pressed in, so as to prevent the die core from shifting before being pressed in; the limiting rod at the bottom end of the die core is inserted into the limiting slot in the pressing groove before being pressed in, so as to prevent the die core from shifting when being pressed in, thereby preventing the die core from shifting and causing the die to be scrapped.

[0031] Finally, it should be noted that the above are only the preferred embodiments of the utility model and are not used to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features therein. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included within the protection scope of the utility model.

Claims

1. A piston forging die, comprising an upper die holder (1) and a lower die holder (2). Convex platforms (5) and grooves (6) are respectively provided on the opposite surfaces of the upper die holder (1) and the lower die holder (2). First press-in grooves (7) and second press-in grooves (8) are respectively formed on the surfaces of the convex platforms (5) and the grooves (6). An upper die core (3) and a lower die core (4) are respectively arranged in the first press-in groove (7) and the second press-in groove (8). Mold cavities (9) are formed on the surfaces of the upper die core (3) and the lower die core (4). It is characterized in that, On the bottom surfaces of the upper die core (3) and the lower die core (4), a plurality of first limiting rods (10) and a plurality of second limiting rods (11) are respectively provided. In the first press-in groove (7), first limiting grooves (12) which are adapted to and have the same number as the first limiting rods (10) are provided. In the second press-in groove (8), second limiting grooves (13) which are adapted to and have the same number as the second limiting rods (11) are provided.

2. The piston forging die according to claim 1, characterized in that, On the top surface of the upper die core (3), a first inner alignment mark (14) is provided. On the surface of the boss (5), a first outer alignment mark (15) which is aligned with the first inner alignment mark (14) is provided.

3. A piston forging die according to claim 1, characterized in that, On the top surface of the lower die core (4), a second inner alignment mark (16) is provided. On the surface of the groove (6), a second outer alignment mark (17) which is aligned with the second inner alignment mark (16) is provided.

4. A piston forging die according to claim 1, characterized in that, The number of both the first limiting rods (10) and the second limiting rods (11) is four.

5. A piston forging die according to claim 1, characterized in that, On the side walls of the upper die holder (1) and the lower die holder (2), fixed clamping grooves (18) and fixed screw holes (19) are provided.

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