Connecting plate forging die and preparation method thereof

Abstract

The invention relates to the field of railways, in particular to a connecting plate forging die and a preparation method thereof.The connecting plate forging die comprises an upper forging die body and a lower forging die body, the bottom face of the upper forging die body is provided with a downwards-concave flash bin part, the center of the flash bin part is provided with a plurality of downwards-concave upper cavities, and the periphery of each upper cavity is provided with an upwards-convex bridge part; the lower forging die is located under the upper forging die, a concave bin cavity is formed in the top face of the lower forging die, a plurality of concave lower cavities are formed in the center of the bin cavity, and the lower cavities are matched with the upper cavities in a one-to-one correspondence mode. The position of the die cavity is proper and reasonable, the structure of a forge piece and the space of a module are ingeniously utilized, the forge piece is easy to form during forging, raw materials are saved, and one-die multi-piece production can be achieved. The device is unique in structure and high in practicability, and the production efficiency is greatly improved to a certain extent.

Description

Technical Field

[0001] The invention relates to the field of railways, and in particular to a connecting plate forging die and a preparation method thereof. Background Art

[0002] The hook frame is a key component of railway freight cars, carrying the traction force and ensuring the stability of the connection between the freight cars. The connecting plate is a connecting part of the hook frame. According to the CRCC certification requirements, the connecting plate is forged with a uniform raw material furnace number, so the forging process has particularity and complexity to meet the needs of domestic vehicle modification and new manufacturing. The existing forging die can only achieve one-die production, with low production efficiency. At the same time, the forging raw material specification of 70 diameter is selected. Due to the small purchase tonnage, it is not convenient for the steel plant to refine this specification of raw materials. Summary of the invention

[0003] Based on the above problems, the purpose of the present invention is to provide a connecting plate forging die and a preparation method thereof. The present invention adopts the following technical solutions:

[0004] The present invention provides a connecting plate forging die, comprising:

[0005] An upper forging die, wherein a concave flash bin portion is provided on the bottom surface of the upper forging die, a plurality of concave upper cavities are provided at the center of the flash bin portion, and a convex bridge portion is provided on the periphery of each of the upper cavities;

[0006] The lower forging die is located directly below the upper forging die, the top surface of the lower forging die is provided with a concave bin cavity, the center position of the bin cavity is provided with a plurality of concave lower cavities, and each of the lower cavities corresponds to each of the upper cavities one by one.

[0007] Preferably, the upper mold cavities and the lower mold cavities are arranged in a rectangular array; two adjacent upper mold cavities are connected by the bridge.

[0008] Preferably, the number of the upper cavity and the number of the lower cavity are both four.

[0009] Preferably, the upper forging die and the lower forging die are both rectangular in shape;

[0010] An upper wedge iron matching surface is arranged on the rectangular long side of the bottom surface of the upper forging die; and a lower wedge iron matching surface is arranged on the rectangular long side of the top surface of the lower forging die.

[0011] Preferably, an upper mark is engraved on the outer side wall where the long side of the upper forging die is located; a lower mark is engraved on the outer side wall where the long side of the lower forging die is located;

[0012] An upper hanging hole is arranged on the outer side wall where the short side of the upper forging die is located; and a lower hanging hole is arranged on the outer side wall where the short side of the lower forging die is located.

[0013] Preferably, an upwardly convex resistance platform is provided in the flash bin portion, and the number of the resistance platforms is two, and the two resistance platforms are symmetrically arranged with respect to the area where the upper cavity is located.

[0014] The present invention also provides a connection plate forging preparation method, including the connection plate forging die described above, the forging preparation method comprising the following steps:

[0015] According to the required cutting size, the round steel is sawed by a sawing machine, and then the round steel is sawed by a sawing tool, and the round steel is sawed along the axis to split it into two;

[0016] Use a heating furnace to heat the 1 / 2 bar material that has been laid, and the heating temperature is 1100-1200℃;

[0017] Put the heated 1 / 2 bar into the connecting plate forging die, and use a 10T die forging hammer for die forging;

[0018] Use 1250T hydraulic press to emboss and remove flash.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are:

[0020] The present invention cleverly utilizes the structure of the forging and the space of the module, making it easy to forge and forming, making full use of the raw materials, and realizing the production of multiple pieces with one mold, thereby improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a structural schematic diagram of the connecting plate forging die of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the upper forging die of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the lower forging die of the present invention;

[0025] Figure 4 This is a structural diagram of 1 / 2 bar material of the present invention;

[0026] Figure 5 This is a product diagram of one mold and four pieces forged by the present invention.

[0027] Explanation of the accompanying drawings: 1. Upper forging die; 101. Flash bin; 102. Upper cavity; 103. Bridge; 104. Upper wedge mating surface; 105. Upper mark; 106. Upper hanging hole; 107. Resistance platform; 2. Lower forging die; 201. Bin cavity; 202. Lower cavity; 203. Lower wedge mating surface; 204. Lower mark; 205. Lower hanging hole. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] like Figures 1 to 3 As shown, this embodiment discloses a connecting plate forging die, the structure of which includes an upper forging die 1 and a lower forging die 2 , and the upper forging die 1 is located directly above the lower forging die 2 .

[0030] The bottom surface of the upper forging die 1 is provided with a concave flash bin 101, and a plurality of concave upper cavities 102 are provided at the center of the flash bin 101. A convex bridge 103 is provided on the periphery of each upper cavity 102, and the cross section of the bridge 13 is rectangular. The flash bin 101 is used to accommodate excess metal during the forging process. The bridge 103 is used to prevent the metal in the upper cavity 102 from flowing outward. The height of the bridge 103 is about 2 mm lower than the bottom surface of the upper forging die 1.

[0031] The top surface of the lower forging die 2 is provided with a concave bin cavity 201 , and a plurality of concave lower cavities 202 are provided at the center of the bin cavity 201 , and each lower cavity 202 corresponds to each upper cavity 102 one by one.

[0032] In this embodiment, the upper mold cavities 102 and the lower mold cavities 202 are arranged in a rectangular array, and the number of the upper mold cavities 102 and the number of the lower mold cavities 202 are both four. Two adjacent upper mold cavities 102 are connected by a bridge portion 103.

[0033] In this embodiment, the upper forging die 1 and the lower forging die 2 are both rectangular in shape; an upper wedge iron matching surface 104 is provided on the rectangular long side of the bottom surface of the upper forging die 1; and a lower wedge iron matching surface 203 is provided on the rectangular long side of the top surface of the lower forging die 2. The upper wedge iron matching surface 104 and the lower wedge iron matching surface 203 are both fastened with the inclined surface of the machine tool equipment through the inclined iron.

[0034] In this embodiment, an upper mark 105 is engraved on the outer wall where the long side of the upper forging die 1 is located; a lower mark 204 is engraved on the outer wall where the long side of the lower forging die 2 is located; wherein the upper mark 105 is located above the upper wedge iron mating surface 104, and the lower mark 204 is located below the lower wedge iron mating surface 203.

[0035] In this embodiment, an upper hanging hole 106 is provided on the outer side wall where the short side of the upper forging die 1 is located, and a lower hanging hole 205 is provided on the outer side wall where the short side of the lower forging die 2 is located. The upper hanging hole 106 and the lower hanging hole 205 are provided to facilitate the lifting and turning of the forging die in actual production.

[0036] In this embodiment, a convex resistance platform 107 is provided in the flash bin 101, and there are two resistance platforms 107, which are arranged symmetrically about the area where the upper cavity 102 is located. The resistance platform 107 is a step designed to block the flow of metal. It specifically solves the problem that the middle billet flows too fast to form a flash, resulting in insufficient material in other places, thus forming a shortage. After the resistance platform 107 is set, the flow of the middle billet is slow, so that it flows to other places, ensuring that there is material in each position of the cavity, so that the cavity is full and the product quality is guaranteed.

[0037] Based on the specific structure of the above-mentioned connecting plate forging die, such as Figure 4 and 5 As shown, this embodiment also discloses a connecting plate forging preparation method, which includes the following steps:

[0038] According to the required cutting size, the round steel of material 25MnCrNiMoA is sawed by using a sawing machine of model GZ4230, and then the round steel is sawed by a sawing tool, and the round steel is sawed along the axis to be divided into two;

[0039] Use a 1600KW medium frequency electric furnace to heat the 1 / 2 bar material that has been laid, and the heating temperature is 1100-1200℃;

[0040] Place the heated 1 / 2 bar in the forging die, at the exact center of the chamber cavity 201 (i.e., the center of the area where the four lower cavities 202 are located), and use a 10T die forging hammer for die forging;

[0041] Finally, a 1250T hydraulic press is used to emboss the characters and remove the flash.

[0042] The forging die of the present invention can realize the production of four pieces in one die, and the four forgings forged are connected by flash edges, and the four forgings are separated after trimming in the later stage. The raw material specifications used in the present invention are all 155 in diameter, and the steel mill is also convenient to refine according to tonnage.

[0043] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A connecting plate forging die, characterized in that: include: An upper forging die (1), wherein a concave flash bin portion (101) is provided on the bottom surface of the upper forging die (1), a plurality of concave upper cavities (102) are provided at the center of the flash bin portion (101), and a convex bridge portion (103) is provided on the periphery of each upper cavity (102); A lower forging die (2), the lower forging die (2) being located directly below the upper forging die (1), the top surface of the lower forging die (2) being provided with a concave bin cavity (201), a plurality of concave lower cavities (202) being provided at the center of the bin cavity (201), each of the lower cavities (202) corresponding to each of the upper cavities (102) being matched with each other.

2. The connection plate forging die according to claim 1, characterized in that: The upper mold cavities (102) and the lower mold cavities (202) are arranged in a rectangular array; two adjacent upper mold cavities (102) are connected by the bridge portion (103).

3. The connection plate forging die according to claim 2, characterized in that: The number of the upper mold cavity (102) and the number of the lower mold cavity (202) are both four.

4. The connection plate forging die according to claim 1, characterized in that: The upper forging die (1) and the lower forging die (2) are both rectangular in shape; An upper wedge iron matching surface (104) is provided on the rectangular long side of the bottom surface of the upper forging die (1); and a lower wedge iron matching surface (203) is provided on the rectangular long side of the top surface of the lower forging die (2).

5. The connection plate forging die according to claim 1, characterized in that: An upper mark (105) is engraved on the outer side wall where the long side of the upper forging die (1) is located; a lower mark (204) is engraved on the outer side wall where the long side of the lower forging die (2) is located; An upper hanging hole (106) is provided on the outer side wall where the short side of the upper forging die (1) is located; and a lower hanging hole (205) is provided on the outer side wall where the short side of the lower forging die (2) is located.

6. The connection plate forging die according to claim 1, characterized in that: An upwardly convex resistance platform (107) is provided in the flash bin portion (101), and the number of the resistance platforms (107) is two, and the two resistance platforms (107) are symmetrically arranged with respect to the area where the upper cavity (102) is located.

7. A method for preparing a connecting plate by forging, comprising the connecting plate forging die according to any one of claims 1 to 6, characterized in that: The connecting plate forging preparation method comprises the following steps: According to the required cutting size, the round steel is sawed by a sawing machine, and then the round steel is sawed by a sawing tool, and the round steel is sawed along the axis to split it into two; Use a heating furnace to heat the 1 / 2 bar material that has been laid, and the heating temperature is 1100-1200℃; Put the heated 1 / 2 bar into the connecting plate forging die, and use a 10T die forging hammer for die forging; Use 1250T hydraulic press to emboss and remove flash.

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