Multi-specification adapted double-pin clamping jaw of a radial forging machine

Abstract

The utility model discloses a kind of double pin clamping jaws of radial forging machine of multi-specification adaptation, including the clamping jaw body of high-strength alloy steel base, its clamping cavity inner wall is equipped with three-stage stepped clamping face, covering the shaft type forge piece of diameter 100mm-800mm;Base two sides parallelly arranged first pin shaft and second pin shaft, wherein first pin shaft is realized high-precision rotary support by clamping jaw sleeve, second pin shaft can be finely adjusted 5 ° displacement in long circular hole, double pin collaborates to share load, and single pin shaft stress is reduced by 40%;Clamping face composite surfacing wear layer is composed of surfacing transition layer and nickel-based high-temperature alloy working layer, and after wearing, it is repaired in situ by TIG welding, and integrated function of long life, multi-specification adaptation, high bearing and low-cost maintenance is comprehensively realized.

Description

Technical Field

[0001] This utility model relates to the technical field of metal plastic forming equipment, specifically a double-pin gripper for a radial forging machine with multiple specifications. Background Technology

[0002] In modern high-end equipment manufacturing, large-tonnage radial forging mills, as crucial equipment for metal plastic forming, undertake the important task of manufacturing large shaft-type key forgings. The forging tools of the radial forging mill, as the executing components directly involved in material processing, directly determine the quality stability of the forgings, production efficiency, and the operational reliability of the equipment. Traditional single-pin grippers have two major drawbacks: first, the clamping force is concentrated on a single pin, leading to easy wear and short lifespan of the pin, making it difficult to meet the high load requirements of large-tonnage forgings; second, the clamping surface is of a fixed size, adapting to only a single specification, and replacing the gripper results in low production efficiency. Therefore, a radial forging mill gripper that can achieve high load-bearing capacity, multi-specification adaptability, and repairability is needed. Utility Model Content

[0003] The purpose of this invention is to provide a dual-pin gripper for a radial forging machine that is compatible with multiple specifications. Through a stepped clamping surface and a dual-pin structure, it achieves high load-bearing capacity, compatibility with multiple specifications, and repairability, thereby solving the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a multi-specification adaptable double-pin gripper for a radial forging machine, comprising a gripper base, wherein the inner wall of the gripping cavity of the gripper base is provided with a stepped gripping surface, and the stepped gripping surface is provided with multiple levels of gripping surfaces of different sizes along the opening and closing direction of the gripper; The gripper base is symmetrically provided with a first pin hole and a second pin hole on both sides. A gripper bushing is installed in the first pin hole, and a first pin is movably connected in the gripper bushing. The second pin hole is an oblong hole, in which a second pin is movably connected. The first pin and the second pin are parallel to each other and spaced apart. The clamping surface of the gripper substrate is coated with a weld overlay wear-resistant layer, which includes a weld overlay transition layer and a weld overlay working layer, with the weld overlay working layer covering the surface of the weld overlay transition layer.

[0005] Preferably, the stepped clamping surface is configured in three levels, forming clamping areas with diameters of 100mm–300mm, 300mm–500mm, and 500mm–800mm, respectively.

[0006] Preferably, the gripper base is forged from 56NiCrMoV7 hot work die steel.

[0007] Preferably, the weld overlay is a high-temperature alloy wear-resistant layer with a thickness of 1%–5% of the base material thickness.

[0008] Preferably, the second pin 6 has a travel of 5° within the elongated hole, which is used to adjust the opening and closing angle of the gripper.

[0009] The working process of this utility model is as follows: After the forging to be processed enters the clamping cavity of the jaw base, the corresponding level of the stepped clamping surface is automatically matched according to the diameter of the forging. When the jaws are closed, the first pin provides the main rotation fulcrum through the jaw bushing, and the second pin adaptively fine-tunes the displacement by 5° in the elongated hole, so that the two pins synchronously share the clamping load. The high wear-resistant surface of the overlay working layer is closely attached to the surface of the forging, maintaining stable clamping under forging impact. After forging is completed, the jaws open to release the forging.

[0010] The beneficial effects of this utility model are as follows: (1) In this utility model, the stepped clamping surface is provided with three different sizes of clamping surfaces (diameter 100mm-300mm, 300mm-500mm, 500mm-800mm) along the opening and closing direction of the jaws. A single set of jaws can cover a variety of conventional shaft forgings. Compared with traditional single-specification jaws, the replacement operation is eliminated, and the work efficiency is improved.

[0011] (2) The high-hardness wear-resistant layer on the stepped clamping surface of this invention can effectively resist friction and wear between the forging and the clamping jaws. The high-strength alloy steel substrate provides support for the surface layer, preventing cracking and peeling of the weld overlay and reducing the problem of unstable clamping of forgings caused by jaw wear. Compared with traditional clamping jaws, the service life of the clamping jaws of this invention is increased by more than 3 times under the same forging conditions.

[0012] (3) In this utility model, the wear-resistant overlay layer adopts a composite design of transition layer and working layer. When the overlay layer is worn, the worn area can be repaired by local re-overlay process. Using automated overlay equipment, the overlay thickness can be precisely controlled according to the degree of wear, and the repair process is simple and efficient. Compared with the traditional method of replacing the entire clamp after wear, the maintenance cycle is shortened, which greatly improves the maintenance convenience of the equipment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Among them: 1. gripper base, 2. weld overlay transition layer, 3. weld overlay working layer, 4. first pin, 5. gripper bushing, 6. second pin, 101. stepped clamping surface. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings.

[0015] like Figure 1The illustrated multi-specification adaptable radial forging machine double-pin gripper includes a gripper base 1 forged from 56NiCrMoV7 hot work die steel. The inner wall of the gripping cavity of the gripper base 1 is provided with a stepped gripping surface 101. The stepped gripping surface 101 is provided with three levels of gripping surfaces of different sizes along the opening and closing direction of the gripper, forming gripping areas with diameters of 100mm–300mm, 300mm–500mm, and 500mm–800mm, respectively. The gripper base 1 is symmetrically provided with a first pin hole and a second pin hole on both sides. A gripper bushing 5 is installed in the first pin hole, and a first pin 4 is movably connected in the gripper bushing 5. The second pin hole is an oblong hole, in which a second pin 6 is movably connected. The first pin 4 and the second pin 6 are parallel to each other and spaced apart. The second pin 6 moves 5° within the oblong hole to adjust the opening and closing angle of the gripper. The clamping surface of the gripper substrate 1 is coated with a weld overlay wear-resistant layer, which includes a weld overlay transition layer 2 and a weld overlay working layer 3. The weld overlay working layer 3 is a high-temperature alloy wear-resistant layer with a thickness of 1%–5% of the thickness of the substrate 1. The weld overlay working layer 3 covers the surface of the weld overlay transition layer 2.

[0016] The working process of this utility model is as follows: After the forging to be processed enters the clamping cavity of the jaw base 1, the corresponding level of the stepped clamping surface 101 is automatically matched according to the diameter of the forging. When the jaws are closed, the first pin 4 provides the main rotation fulcrum through the jaw bushing 5, and the second pin 6 adaptively fine-tunes its displacement in the elongated hole, so that the two pins synchronously share the clamping load. The high wear-resistant surface of the overlay working layer 3 is closely attached to the surface of the forging, maintaining stable clamping under forging impact. After forging is completed, the jaws open to release the forging. Example

[0017] 1) Forge a 56NiCrMoV7 steel gripper base 1 and machine a three-level stepped clamping surface 101; 2) Weld a 4mm transition layer 2 onto the clamping surface, and then weld a 6mm nickel-based working layer 3. 3) Finish machine the first pin hole and assemble the clamping sleeve 5; machine the second pin hole into an elongated hole; 4) During assembly, the first pin 4 passes through the gripper sleeve 5, and the second pin 6 is inserted into the elongated hole, with the two pins parallel and spaced 300mm apart.

[0018] 5) When the wear depth of the surfacing working layer 3 is >2mm, tungsten inert gas welding is used to locally repair the working layer.

[0019] The gripper described in this utility model adopts a bimetallic composite structure, which combines the high strength of the core with the high wear resistance of the clamping parts. The three-tiered clamping structure allows the gripper to closely fit forgings of different specifications, and the stable double-pin support structure ensures synchronous operation of all parts of the gripper.

[0020] like Figure 1As shown, the gripper consists of a base 1 and a wear-resistant layer composed of a weld overlay transition layer 2 and a weld overlay working layer 3. The inner side of the gripping part of the base 1 adopts a stepped shape design, with three different sizes of gripping steps set along the opening and closing direction, dividing the workpiece gripping areas into large, medium and small workpiece gripping areas to meet the gripping requirements of different specifications of forgings.

[0021] In the above scheme, the steel material used for the gripper base 1 is hot work die steel, with the grade 56NiCrMoV7. This steel is smelted in an electric furnace and then forged into a gripper base, and processed into a three-step trapezoidal structure according to the external dimensions.

[0022] Then, a high-temperature alloy wear-resistant layer is deposited on the surface of the gripping area of ​​the jaws. This deposited layer consists of a bottom transition layer 2 and a top working layer. The transition layer 2 has good high-temperature mechanical properties and crack resistance, while the deposited working layer 3 has good oxidation resistance, corrosion resistance, and high-temperature strength. The bimetallic welded repairable design of the jaws in this invention allows for local re-welding repair of the worn area when the welded layer wears down after prolonged use. This significantly reduces the amount of jaws scrapped, and the lifespan of the repaired jaws is no less than, and may even be greater than, the lifespan of the original jaws.

[0023] In the above scheme, two pin holes are provided on the gripper base 1 so that the first pin 4 and the second pin 6 are installed parallel to each other. The first pin hole is circular, and the gripper bushing 5 is installed in the hole to improve the wear resistance of the pin; the second pin hole adopts an elongated hole design, which allows the second pin 6 to move within a certain range, realizes the fine adjustment of the opening and closing angle of the gripper, and ensures a reliable connection and flexible rotation between the pin and the gripper body.

[0024] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, based on the technical teachings provided by this utility model and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of this utility model.

Claims

1. A multi-specification adaptable double-pin gripper for a radial forging machine, characterized in that: Includes a gripper base (1), the inner wall of the gripping cavity of the gripper base (1) is provided with a stepped gripping surface (101), the stepped gripping surface (101) is provided with multiple levels of gripping surfaces of different sizes along the opening and closing direction of the gripper; The gripper base (1) is symmetrically provided with a first pin hole and a second pin hole on both sides. A gripper bushing (5) is installed in the first pin hole, and a first pin (4) is movably connected in the gripper bushing (5). The second pin hole is an oblong hole, and a second pin (6) is movably connected in it. The first pin (4) and the second pin (6) are parallel to each other and spaced apart. The clamping surface of the gripper substrate (1) is coated with a weld overlay wear-resistant layer, which includes a weld overlay transition layer (2) and a weld overlay working layer (3), with the weld overlay working layer (3) covering the surface of the weld overlay transition layer (2).

2. The multi-specification adaptable double-pin gripper for radial forging machines according to claim 1, characterized in that: The stepped clamping surface (101) is set in three levels, forming clamping areas with diameters of 100mm–300mm, 300mm–500mm, and 500mm–800mm respectively.

3. A multi-specification adaptable double-pin gripper for a radial forging machine according to claim 1 or 2, characterized in that: The gripper base (1) is forged from 56NiCrMoV7 hot work die steel.

4. A multi-specification adaptable double-pin gripper for a radial forging machine according to claim 3, characterized in that: The weld overlay working layer (3) is a high-temperature alloy wear-resistant layer, and its thickness is 1%–5% of the thickness of the substrate (1).

5. A multi-specification adaptable double-pin gripper for a radial forging machine according to claim 4, characterized in that: The second pin (6) moves 5° within the elongated hole, which is used to adjust the opening and closing angle of the gripper.

Images