Conical tooth forging die

Abstract

The utility model discloses a conical tooth forging die which comprises an upper forming die arranged on an upper die base and a lower forming die arranged on a lower die base, a tooth forming cavity is formed in the bottom of the upper forming die, and a blank cavity is formed in the position, corresponding to the tooth forming cavity, of the top of the lower forming die. The tooth forming cavity and the blank cavity can be folded to form an inverted-cone-shaped cavity, the bottom of the blank cavity is provided with a conical hole which extends downwards in the center line direction of the blank cavity, the diameter of the conical hole is gradually increased, an ejector rod hole is formed in the bottom of the conical hole in a penetrating mode along the center line, and an ejector rod is arranged in the ejector rod hole in the same center line. According to the utility model, the part with machining allowance on the lower part of the forging blank is utilized to form a cone structure in the forging process to be limited with the conical hole, so that the upper die is prevented from being adhered and brought out of the forging blank in the rising process, and meanwhile, the forging blank is conveniently ejected by the ejector rod to realize demoulding.

Description

Technical Field

[0001] The utility model relates to the technical field of gear processing, in particular to a cone gear forging die. Background Art

[0002] Bevel gears (also called bevel gears or bevel gears) are a type of gear used to transfer power between intersecting shafts, most commonly between perpendicular intersecting shafts. They can change the direction of force and are able to provide continuous power transmission between two shafts, even if the shafts are not in the same plane. The design and manufacture of bevel gears usually require high precision and complex processes, with forging being a common manufacturing method.

[0003] Forging is a process that uses pressure to deform metal materials in a die to obtain the desired shape. For bevel gears, this usually means placing a preheated metal block in a specially designed die, and then applying huge force to plastically deform the metal so that it fills every detail of the die, thereby forming the precise contour of the gear. When designing the product forging blank, the tooth-shaped tooth forming cavity is generally designed in the upper die for easy filling, and the lower die cavity is left with a machining allowance. However, during the forging process, since the tooth forming cavity has a larger contact area with the product than the lower mold cavity, the forging blank is easy to adhere to the upper die after forging. After the upper die is raised, the operator needs to clamp the forging blank and then use tools to pry the forging blank off the upper die. This not only affects the forging efficiency and forging blank quality, but also the temperature of the forging blank is high at this time, and manual operation is prone to safety accidents. Utility Model Content

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the utility model is: how to provide a tapered tooth forging die that can prevent the forging blank from sticking to the upper die during the forging process and ensure smooth ejection of the forging blank after forging.

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

[0006] A tapered tooth forging die comprises a forming upper die arranged on an upper die seat and a forming lower die arranged on a lower die seat, a tooth forming cavity is arranged at the bottom of the forming upper die, a blank cavity is arranged at the top of the forming lower die corresponding to the position of the tooth forming cavity, when the forming upper die is closed with the forming lower die, the tooth forming cavity and the blank cavity can be closed to form an inverted cone cavity, the bottom of the blank cavity has a tapered hole extending downward along the center line of the blank cavity and gradually increasing in diameter, a push rod hole is penetrated at the bottom of the tapered hole along its center line, and a push rod is arranged in the push rod hole on the same center line.

[0007] The forging blank is placed in the blank cavity. When the forming upper die and the forming lower die are closed, the tooth forming cavity squeezes the tooth shape on the upper part of the forging blank, and at the same time, the lower part of the forging blank is squeezed into the tapered hole, and finally a tapered structure is formed on the lower part of the forging blank; after the forging is completed, since the cone structure formed at the lower part of the forging blank is restricted by the tapered hole, the forming upper die can easily separate from the forging blank when it rises, and then the forging blank remains on the forming lower die; when the forging blank is demolded, since the temperature of the gear is high during forging, the forging blank is better shaped at this time, and the upper push of the ejector pin can easily eject the forging blank from the blank cavity to achieve demolding.

[0008] As an optimization, the depth of the tapered hole is 3 mm to 4 mm.

[0009] As an optimization, the semi-cone angle of the tapered hole is 5° to 7°. The purpose of setting the tapered hole is to limit the forging blank, and the force of limiting the forging blank can be greater than the force of separating the forming upper die from the forging blank, and can prevent the forming upper die from taking away the forging blank, and can make the ejector rod easily eject the forging blank.

[0010] As an optimization, the top of the tooth forming cavity has a core hole which passes upward along the center line direction of the tooth forming cavity, and an upper core is arranged in the core hole on the same center line. The top surface of the upper core is flush with the top surface of the forming upper mold, and the bottom of the upper core extends into the tooth forming cavity.

[0011] Compared with the prior art, the utility model has the following advantages: the utility model utilizes the portion with machining allowance at the bottom of the forging blank to form a conical structure and a conical hole for limiting during the forging process, thereby preventing the upper die from sticking to and pulling out the forging blank during the rising process, and also facilitates demolding by using a push rod to eject the forging blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural cross-sectional view of the utility model during the forging process;

[0013] Figure 2 for Figure 1 A is an enlarged schematic diagram. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0015] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when used, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0016] like Figure 1 and Figure 2As shown, the tapered tooth forging die in this specific embodiment includes a forming upper die 1 arranged on an upper die seat and a forming lower die 2 arranged on a lower die seat, a tooth forming cavity is arranged at the bottom of the forming upper die 1, and a blank cavity is arranged at the top of the forming lower die 2 corresponding to the position of the tooth forming cavity, when the forming upper die 1 and the forming lower die 2 are molded together, the tooth forming cavity and the blank cavity can be closed to form an inverted cone cavity, the bottom of the blank cavity has a tapered hole extending downward along the center line of the blank cavity and with a gradually increasing diameter, a push rod hole is pierced at the bottom of the tapered hole along its center line, and a push rod 3 is arranged in the push rod hole on the same center line.

[0017] In this specific implementation manner, the hole depth h of the tapered hole is 3.5 mm.

[0018] In this specific implementation, the semi-cone angle α of the conical hole is 5°.

[0019] In this specific embodiment, the top of the tooth forming cavity has a core hole extending upward along the center line of the tooth forming cavity, and an upper core 4 is arranged in the core hole on the same center line. The top surface of the upper core 4 is flush with the top surface of the forming upper mold 1, and the bottom of the upper core 4 extends into the tooth forming cavity.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described by referring to the preferred embodiments of the utility model, those skilled in the art should understand that various changes can be made in form and details without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A tapered tooth forging die, comprising an upper forming die arranged on an upper die seat and a lower forming die arranged on a lower die seat, a tooth forming cavity is arranged at the bottom of the upper forming die, a blank cavity is arranged at the top of the lower forming die corresponding to the position of the tooth forming cavity, when the upper forming die and the lower forming die are closed, the tooth forming cavity and the blank cavity can be closed to form an inverted cone cavity, characterized in that: The bottom of the blank cavity is provided with a tapered hole extending downward along the center line of the blank cavity and with a gradually increasing diameter. A push rod hole is penetrated at the bottom of the tapered hole along its center line, and a push rod is arranged in the push rod hole along the center line.

2. The tapered tooth forging die according to claim 1, characterized in that: The hole depth of the tapered hole is 3 mm to 4 mm.

3. The tapered tooth forging die according to claim 1, characterized in that: The semi-cone angle of the conical hole is 5° to 7°.

4. The tapered tooth forging die according to claim 1, characterized in that: The top of the tooth forming cavity has a core hole which is upwardly penetrated along the center line of the tooth forming cavity. An upper core is arranged in the core hole on the same center line. The top surface of the upper core is flush with the top surface of the forming upper mold, and the bottom of the upper core extends into the tooth forming cavity.

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