Mandrel for forging inner stepped hole

Abstract

The utility model relates to the technical field of inner step forge piece forming, in particular to a mandrel for forging an inner step hole, which comprises a first carrier and a second carrier which are respectively positioned on two sides of a mandrel, the outer diameters of the first carrier and the second carrier are smaller than or equal to the inner diameter of the mandrel, and the two carriers are connected with the mandrel in a welding manner and are provided with guide inclined surfaces and transition cambered surfaces; a detachable forging die assembly is arranged on the mandrel and is of a split structure, and forging grooves are formed after the forging die assembly is installed at the two ends of the mandrel. The forging die assembly is composed of two coaxially-arranged saddle sleeves, working cavities are formed in the saddle sleeves, and arc-shaped buckles are arranged at the bottoms of the saddle sleeves. According to the forging die, the stability during forging of an inner stepped hole can be improved, the forging grooves formed by replacing the forging die assemblies of different specifications can adapt to forgings of different specifications, tool cost is reduced, resource waste is reduced, when the forgings are clamped, the forgings can be taken out quickly only by lowering the forging die assembly on one side, and destructive taking out and secondary machining are avoided.

Description

A lever for forging internal stepped holes Technical Field

[0001] This utility model relates to the field of forming technology of internal stepped forgings, and more specifically to a lever for forging internal stepped holes. Background Technology

[0002] Currently, in the forging industry, forgings with stepped inner holes are widely used in the field of mechanical parts, and their machining is usually completed using a lever.

[0003] However, most existing forging levers are one-piece structures, which have many limitations. For example, if the inner hole is not enlarged to the target size due to equipment, operation, or material problems, the forging is easily stuck in the lever, and it can only be removed or replaced by destructive means, resulting in waste of raw materials and tooling. If the lever is retained, the forging needs to be reheated and processed again, which prolongs the production cycle, increases energy consumption and labor costs, and reduces production flexibility, causing economic losses, especially in precision or urgent orders.

[0004] Because the specifications of the forging holes of traditional forging bars are fixed, they are only suitable for specific stepped inner hole structures. In actual production, customer needs are often changing, and the step depth often needs to be adjusted. Enterprises need to pre-manufacture forging bars of multiple specifications, which leads to increased tooling costs, reduced production efficiency and waste of resources. In addition, the frequent feeding and unloading of traditional forging bars can easily lead to local wear, thereby affecting the quality of forgings and increasing maintenance costs. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a lever for forging inner stepped holes, which addresses the technical problems of the existing one-piece lever forging being stuck and unable to be removed or causing a lot of losses when removed, as well as the fixed specifications making it difficult to adapt to the specifications of the forging, and the easy wear caused by frequent feeding and unloading.

[0006] To achieve the above objectives, this utility model adopts the following technical solution:

[0007] This utility model provides a lever for forging inner stepped holes, including a first carrier, a second carrier and a mandrel. The first carrier and the second carrier are respectively installed on both sides of the mandrel, and the outer diameter of the first carrier is less than or equal to the inner diameter of the mandrel, and the outer diameter of the second carrier is the same as the outer diameter of the first carrier.

[0008] A detachable forging die assembly is fitted onto the mandrel. The forging die assembly is a split structure. After the forging die assembly is installed at both ends of the mandrel, it forms a forging groove. The outline of the forging groove fits the outer wall of the forging material.

[0009] The present invention is further configured such that: the forging die assembly consists of two coaxially arranged lever sleeves, and the lever sleeves have a working cavity inside.

[0010] The present invention is further provided with an arc-shaped buckle at the bottom of the horse lever sleeve for fixing the horse lever sleeve to the spindle.

[0011] The present invention is further configured such that the opening end face of the horse lever sleeve is inclined, planar, or curved.

[0012] The present invention is further configured such that the first carrier, the second carrier, and the mandrel are connected by welding.

[0013] The present invention is further configured such that the top ends of the first carrier and the second carrier are provided with guide slopes.

[0014] The present invention is further configured such that the connecting ends of the first carrier, the second carrier and the mandrel are provided with transition arc surfaces.

[0015] The present invention is further configured such that the surface of the mandrel is provided with a wear-resistant coating.

[0016] In summary, the present invention has the following beneficial effects: The present invention adopts a split forging die assembly, which specifically consists of two replaceable end faces and specifications of the forging die sleeve, which are installed at both ends of the mandrel, thereby forming a groove on the mandrel that can adapt to forgings of different widths and depths. This solves the problem of the traditional forging die having fixed specifications and only being able to fit the inner hole of a step with a specific depth, reducing tooling costs and minimizing resource waste.

[0017] When a forging becomes stuck, the forging can be quickly removed by simply removing one side of the lever sleeve, avoiding the need for destructive removal methods or reheating the forging for secondary processing due to jamming. Furthermore, welding the two carriers to the mandrel increases stability, and the guide ramps at the top of the two carriers and the transition arc at the connection end facilitate loading and unloading of the forging, enhancing processing stability and extending service life. Attached Figure Description

[0018] Figure 1 is a cross-sectional structural diagram of this utility model;

[0019] Figure 2 is a schematic diagram of the horse lever sleeve structure of this utility model;

[0020] Figure 3 is a three-dimensional structural diagram of this utility model.

[0021] Reference numerals: 10, first carrier; 11, guide slope; 12, transition arc surface; 20, second carrier; 30, forging die assembly; 101, mandrel; 301, lever sleeve; 302, working cavity; 303, arc-shaped buckle; 60, forging groove. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings.

[0023] To make the objectives, solutions, and advantages of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0024] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, well-known structures, circuits, materials, or methods are not specifically described in order to avoid obscuring the present invention.

[0025] In the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0026] The embodiments of this utility model will now be described in detail with reference to Figures 1-3.

[0027] Example 1:

[0028] This embodiment provides a forging lever for forging internal stepped holes, including a first carrier 10, a second carrier 20, and a mandrel 101. The first carrier 10 and the second carrier 20 are respectively installed on both sides of the mandrel 101, and the outer diameter of the first carrier 10 is less than or equal to the inner diameter of the mandrel 101, while the outer diameter of the second carrier 20 is the same as the outer diameter of the first carrier 10. The structure formed by the difference between the first carrier 10, the second carrier 20, and the mandrel 101 increases the overall stability of the lever's center of gravity. The first carrier 10 and the second carrier 20 are distributed on both sides of the mandrel 101, forming a stable frame structure together with the mandrel 101. This makes the interaction between the various parts more coordinated when the entire structure is under stress, and can better resist various complex forces generated during the forging process, ensuring that the lever will not shake or deform during operation and maintaining a stable working state. At the same time, it makes the first carrier 10 and the second carrier 20 less obstructive to the installation of the forging during the forging operation.

[0029] Furthermore, a detachable forging die assembly 30 is sleeved on the mandrel 101. The forging die assembly 30 is a split structure. After the forging die assembly 30 is installed at both ends of the mandrel 101, it forms a forging groove 60. The outline of the forging groove 60 fits the outer wall of the forging material.

[0030] The split forging die assembly 30 can be adjusted according to the needs of the forging, avoiding the technical problem of having to replace the entire mandrel when processing forgings of different specifications, reducing tooling costs and time waste. After forging, if the forging gets stuck, since the forging die assembly 30 is detachable, only one end of the forging die assembly 30 needs to be removed to easily take the forging off the mandrel 101, avoiding the need to use destructive means to remove the forging, reducing the loss of raw materials and tooling. The detachable structure facilitates the individual maintenance or replacement of the forging die assembly 30. When the forging die assembly 30 wears out due to long-term use, only the damaged part needs to be replaced instead of replacing the entire mandrel 101, reducing maintenance costs.

[0031] Example 2:

[0032] This embodiment is based on the above embodiment, as shown in Figures 1 and 2. In this embodiment, the forging die assembly 30 consists of two coaxially arranged lever sleeves 301, and the lever sleeves 301 have a working cavity 302 inside.

[0033] Working cavities 302 are provided on both coaxial lever sleeves 301 to facilitate alignment and positioning with the mandrel 101. Operators can quickly place them in the predetermined position, reducing installation time. When the coaxial and symmetrical lever sleeves 301 bear various forces during the forging process on the mandrel 101, the force distribution is more uniform, effectively reducing component deformation or displacement caused by uneven force, enhancing the overall structural integrity, preventing displacement of the lever sleeves 301 relative to the mandrel, and ensuring the forming quality of the forging. Specific lubricants or anti-wear coatings can be added to the working cavities 302 according to different forging process requirements to improve friction conditions during the forging process or achieve special forging effects.

[0034] Example 3:

[0035] To further improve the ease of installation and removal of the lever sleeve 301, as shown in Figures 2 and 3, in this embodiment, the lever sleeve 301 is provided with an arc-shaped buckle 303 at its bottom for fixing the lever sleeve 301 to the mandrel 101. The bottom arc-shaped buckle 303 makes the disassembly of the lever sleeve 301 easier, and the buckle is effectively secured by fasteners such as clips or bolts to ensure the stability of the lever sleeve 301, providing a foundation for forging safety.

[0036] When disassembly is required, simply remove the fasteners on one side of the clip to quickly remove the lever sleeve 301 on that side, thereby removing the forging. No other complicated operations are required, reducing maintenance costs and improving production flexibility.

[0037] Example 4:

[0038] This embodiment is based on the above embodiment. Referring to Figure 3, in this embodiment, the shape and specifications of the open end face of the lever sleeve 1 can be set according to actual usage requirements, including but not limited to inclined settings, planar settings, or curved surface settings with a specific curvature. By combining two lever sleeves 301 of different specifications, the lever sleeve assembly 1 forms a forging area that adapts to forgings of different specifications when installed on the lever. This effectively avoids the need for enterprises to frequently replace the integrated lever due to differences in forging specifications, reducing procurement and time costs. At the same time, the precisely matched forging area can provide more stable support and constraint for the forging during the forging process, which helps to improve the forming accuracy of the forging and ensure product quality.

[0039] Example 5:

[0040] To further improve the overall structural stability of the horse harness, this embodiment is based on the above embodiment.

[0041] In this embodiment, the first carrier 10, the second carrier 20 and the mandrel 101 are connected by welding.

[0042] Welding allows the first carrier 10, the second carrier 20, and the mandrel 101 to form a robust integral structure, reducing the risks caused by loose connections. During the forging process, the mandrel 101 bears the main forging force; through welding, these forces can be evenly transmitted to the first carrier 10 and the second carrier 20, extending the service life of the mandrel.

[0043] Example 6:

[0044] To further improve the convenience of loading and unloading forgings, this embodiment is based on the above embodiment. As shown in Figure 1, in this embodiment, the top of the first carrier 10 and the second carrier 20 are provided with guide slopes 11. When the forging is installed on the mandrel 101, the guide slopes 11 can play a guiding role, making the installation process of the forging smoother.

[0045] When removing forgings, the guide ramp is used to enter during installation, and its tilt angle can also be used to reduce the risk of forging jamming and improve removal efficiency.

[0046] Furthermore, considering that the mandrel will be subjected to huge impact and pressure during the forging process, and stress is prone to concentrate at the connection point, which may lead to damage or deformation, the connection end of the first carrier 10, the second carrier 20 and the mandrel 101 is provided with a transition arc surface 12.

[0047] On the one hand, the lever needs to adapt to frequent impact forces and alternating loads. The presence of the transition arc surface 12 makes the geometry of the connection end smoother, and the stress can be gradually dispersed along the arc surface, relieving stress concentration, improving the overall mechanical properties and fatigue resistance of the lever, and extending its service life.

[0048] On the other hand, during loading and unloading of forgings, the guide ramp 11 and the transition arc surface 12 work together. First, the forging moves towards the mandrel 101 via the guide ramp 11. During this process, the presence of the transition arc surface 12 allows the forging to smoothly transition to the correct position when approaching the connection end. The synergistic effect of the two reduces the possibility of jamming or misalignment of the forging during installation, improving the efficiency and accuracy of installation.

[0049] Example 7:

[0050] To ensure a more stable fit between the mandrel and other components and to extend the service life of the mandrel, this embodiment, based on the above embodiment, provides a wear-resistant coating on the surface of the mandrel 101.

[0051] During forging, the mandrel 101 is typically subjected to cyclic loads, which easily leads to fatigue wear on its surface. Wear-resistant coatings can disperse stress, reduce localized stress concentration, and thus improve the mandrel's resistance to fatigue wear, further extending its service life. Wear-resistant coatings can be chromium plating, which has high hardness and good wear resistance. Chromium plating also has a certain self-healing ability, able to repair some damage through oxidation and other reactions after minor scratches. Alternatively, nickel-chromium alloys or nickel-cobalt alloys can be used; these coatings not only have high hardness and wear resistance but also good toughness and fatigue resistance. Nickel-based alloy coatings provide reliable protection for the mandrel 101 under complex environments such as high temperature, high pressure, and high load.

[0052] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A forging lever for forging internal stepped holes, comprising a first carrier (10), a second carrier (20), and a mandrel (101), characterized in that: The first carrier (10) and the second carrier (20) are respectively installed on both sides of the mandrel (101), and the outer diameter of the first carrier (10) is less than or equal to the inner diameter of the mandrel (101), and the outer diameter of the second carrier (20) is the same as the outer diameter of the first carrier (10); a detachable forging die assembly (30) is sleeved on the mandrel (101), the forging die assembly (30) is a split structure, and after the forging die assembly (30) is installed at both ends of the mandrel (101), a forging groove (60) is formed, and the outline of the forging groove (60) fits the outer wall of the forging material.

2. A lever for forging an inner stepped hole according to claim 1, characterized in that: The forging die assembly (30) consists of two coaxially arranged lever sleeves (301), and the lever sleeves (301) have a working cavity (302) inside.

3. A lever for forging an inner stepped hole according to claim 2, characterized in that: The bottom of the lever sleeve (301) is provided with an arc-shaped buckle (303) for fixing the lever sleeve (301) to the spindle (101).

4. A lever for forging an inner stepped hole according to claim 3, characterized in that: The opening end face of the horse lever sleeve (301) is inclined, planar, or curved.

5. A lever for forging an inner stepped hole according to claim 4, characterized in that: The first carrier (10), the second carrier (20), and the mandrel (101) are connected by welding.

6. A lever for forging an inner stepped hole according to claim 5, characterized in that: The top ends of the first carrier (10) and the second carrier (20) are provided with guide slopes (11).

7. A lever for forging an inner stepped hole according to claim 6, characterized in that: The first carrier (10), the second carrier (20) and the mandrel (101) are provided with a transition arc surface (12).

8. A lever for forging an inner stepped hole according to any one of claims 1-7, characterized in that: The surface of the mandrel (101) is provided with a wear-resistant coating.

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