A cold heading die for an automobile engine nozzle body

Abstract

This invention discloses a cold forging mold for automotive engine nozzle bodies, relating to the field of nozzle body mold technology. It includes module A, with module B fixedly connected to the bottom of module A. Module C is detachably mounted on the bottom of module B. Modules A, B, and C are interconnected. An inner mold is provided on the inner side of module A, with a curved bottom surface on the inner side. An annular buffer groove is formed on the inner wall of module A. In this cold forging mold for automotive engine nozzle bodies, module C can have different inner diameters and can be disassembled and replaced, thereby increasing the mold's versatility. The limiting action of the inner mold and clamping components keeps the material in the middle of the mold. When the top driving device presses the material downwards, the inner mold separates the material at discontinuous points. As the driving device continues to press downwards, the bottom inner side of the inner mold limits the material, preventing hard deformation during the downward pressing process.

Description

Technical Field

[0001] This invention relates to the field of nozzle body mold technology, specifically a cold heading mold for automobile engine nozzle bodies. Background Technology

[0002] The fuel injection system is a key component of a car engine, and its quality directly affects the vehicle's speed, fuel consumption, and environmental pollution. As a crucial part of the fuel injection system for heavy-duty vehicles, the nozzle body is experiencing increasing market demand. The nozzle body's inner cavity is not only complex in shape with small fillets at the transition points of each section, but also incorporates steel balls and springs that work in pressure with the nozzle body to achieve its opening and closing function.

[0003] Currently, the forming and processing of nozzle bodies in the market often employs machining methods such as milling or drilling. However, these machining methods cannot achieve the machining of small radii at the transition sections. A few companies also use hot precision dies for forging to achieve smaller parts, but this results in large subsequent machining allowances, low material utilization, and high energy consumption. Furthermore, the oxidation and burning of the blank during hot forging, as well as the softening and deformation of the die, cause the inner cavity of the forging to have a taper and the radii at the transition sections of each section to be large. This leads to poor guidance during die processing and poor surface finish of the inner hole, which cannot meet the usage requirements of nozzle body parts.

[0004] Some companies use cold extrusion molds for forming, but these molds are based on machining. After rough machining, cold pressing molds are used to shape the rounded corners to meet the required size. This is a micro-deformation. The resulting support body only meets the requirements in terms of shape, but its density is the same as that of the machined body. The service life of both is the same. Furthermore, because it is a micro-shape forming, the surface smoothness of the inner wall and other parts is not high, which affects the spraying effect and the quality is not significantly improved.

[0005] Some companies also use machining and a cold extrusion molding die. However, after molding, because it is a one-time extrusion molding, the molded product has a lot of residual stress. Over time, due to the influence of residual stress, the overall size, fillets, and diameter will all deform, resulting in a short service life. It must be replaced every once in a while, which increases the cost of engine use. Otherwise, the fuel injection effect will be greatly reduced. Summary of the Invention

[0006] The purpose of this invention is to provide a cold heading mold for an automobile engine nozzle body to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a cold heading mold for an automotive engine nozzle body, comprising module A, module B fixedly connected to the bottom of module A, module C detachably installed at the bottom of module B, module A, module B and module C being interconnected, an inner mold provided on the inner side of module A, the bottom of the inner side of the inner mold being curved, an annular buffer groove provided on the inner wall of module A, a buffer member A fixedly connected inside the annular buffer groove, the top of the buffer member A being fixedly connected to the middle of the outer side of the inner mold, buffer members B being symmetrically fixedly connected to the two sides inside the module B, a clamping member fixedly connected to the inner end of the buffer member B, the two clamping members being symmetrical to each other, and a hollow groove being provided in the middle of the two clamping members;

[0008] Optionally, a fixing block is fixedly connected to the top outer side of module C, and screws are provided at the four corners of module C. Module C is fixedly connected to the bottom of module B through the screws. Screw holes A are opened at the four corners of the fixing block, and screw holes B are opened at the four corners of the bottom of module B. The top end of the screw passes through the screw hole A and is fixedly connected inside the screw hole B.

[0009] Optionally, a limiting slot is provided on the inner side of module A at a position corresponding to the top of the inner mold, and the limiting slot is adapted to the top of the inner mold.

[0010] Optionally, module A and module B are an integral structure.

[0011] Optionally, both buffer A and buffer B are high-strength springs.

[0012] Optionally, the bottom of module A is welded to the top of module B.

[0013] Compared with the prior art, the present invention provides a cold heading forming die for an automobile engine nozzle body, which has the following advantages:

[0014] 1. The cold heading mold for the automotive engine nozzle body, module C, can have different inner diameters and can be disassembled and replaced, thereby increasing the mold's versatility. The limiting action of the inner mold and clamping parts keeps the material in the middle of the mold. When the top drive device presses the material downwards, the inner mold separates the material at discontinuous points. As the drive device continues to press downwards, the bottom inner side of the inner mold limits the material, preventing hard deformation during downward pressing. When the material moves upwards to demold, the inner mold or clamping parts, through the central space, remove burrs from the material surface through friction, further improving the smoothness and flatness of the produced material surface. Burr waste falls downwards through the bottom of the mold.

[0015] 2. In the cold heading forming mold of the car engine nozzle body, when the driving equipment drives the material to press down so that the inner mold corresponds to the discontinuity of the material, the limiting groove will dock with the inner mold. The limiting groove keeps the inner mold stable during the processing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the cold heading mold for the automobile engine nozzle body of the present invention.

[0017] Figure 2 This is a schematic diagram of the top view of the cold heading forming mold for the automobile engine nozzle body of the present invention.

[0018] Figure 3 The cold heading die for the automobile engine nozzle body of this invention is along Figure 2 A schematic diagram of the cross-sectional view of the structure along the AA section line;

[0019] Figure 4 This is a schematic diagram of the bottom structure of module B of the cold heading mold for the automobile engine nozzle body of the present invention.

[0020] Figure 5 This is a schematic diagram of the bottom structure of module C of the cold heading mold for the automotive engine nozzle body of the present invention.

[0021] In the diagram: 1. Module A; 2. Module B; 3. Module C; 4. Inner mold; 5. Buffer A; 6. Buffer B; 7. Clip; 8. Fixing block; 9. Screw; 10. Limiting slot. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] Please see Figure 1-5 As shown, one embodiment of this application provides a cold heading forming mold for an automotive engine nozzle body, including module A1, module B2 fixedly connected to the bottom of module A1, module C3 detachably installed at the bottom of module B2, module A1, module B2 and module C3 are interconnected, an inner mold 4 is provided on the inner side of module A1, the bottom of the inner side of the inner mold 4 is curved, an annular buffer groove is provided on the inner wall of module A1, a buffer member A5 is fixedly connected inside the annular buffer groove, the top of the buffer member A5 is fixedly connected to the middle of the outer side of the inner mold 4, buffer members B6 are symmetrically fixedly connected on both sides inside the module B2, a clamping member 7 is fixedly connected to the inner end of the buffer member B6, the two clamping members 7 are symmetrical to each other, a hollow groove is provided in the middle of the two clamping members 7, and both buffer members A5 and buffer members B6 are strong springs.

[0026] In this embodiment, module B2 can process materials, and module C3, as an external module, can be replaced as needed during use. Module C3 can have different inner diameters, thereby further improving the application range of the mold. Under the limiting action of the inner mold 4 and the clamping piece 7, the material can be kept in the middle of the mold. When the top driving device extrudes the material downward, the inner mold 4 separates the discontinuities of the material. When the driving device continues to extrude downward, the bottom inner side of the inner mold 4 limits the material to prevent hard deformation during the downward extrusion process. When the material is demolded and moved upward, the lifting driving device pushes the material out from bottom to top. During this process, the inner mold 4 or the clamping piece 7 can remove burrs from the surface of the material through the central space, thereby further improving the smoothness and flatness of the produced material surface.

[0027] Furthermore, a fixing block 8 is fixedly connected to the top outer side of module C3, and screws 9 are provided at the four corners of module C3. Module C3 is fixedly connected to the bottom of module B2 through screws 9. Screw holes A are provided at the four corners of fixing block 8, and screw holes B are provided at the four corners of the bottom of module B2. The top of screw 9 passes through screw hole A and is fixedly connected inside screw hole B.

[0028] Module C3 is fixedly connected to the bottom of module B2 via screw 9. By replacing module C3, the mold can process nozzles of different lengths and diameters. It is easy to disassemble and use.

[0029] In this embodiment, a limiting groove 10 is further provided on the inner side of module A1 at a position corresponding to the top of the inner mold 4. The limiting groove 10 is adapted to the top of the inner mold 4. When the driving device drives the material to press down, at the discontinuity between the inner mold 4 and the material, the driving device presses down, and the limiting groove 10 will dock with the inner mold 4. The limiting effect of the limiting groove 10 keeps the inner mold 4 stable during the processing.

[0030] In this embodiment, module A1 and module B2 are an integral structure and can be integrally cast.

[0031] In this embodiment, the bottom of module A1 is welded to the top of module B2, and module A1 and module B2 can be connected by welding.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cold-upset forming die for an automotive engine nozzle body comprising a die block A (1), characterized in that: Module A (1) is fixedly connected to the bottom of module B (2), and module C (3) is detachably installed at the bottom of module B (2). Module A (1), module B (2) and module C (3) are interconnected. The inner side of module A (1) is provided with an inner mold (4). The bottom of the inner side of the inner mold (4) is curved. The inner wall of module A (1) is provided with an annular buffer groove. The inner side of the annular buffer groove is fixedly connected with a buffer component A (5). The top of the buffer component A (5) is fixedly connected to the middle of the outer side of the inner mold (4). The inner side of module A (1) and the top of the inner mold (4) are provided with a limiting slot (10). The limiting slot (10) is adapted to the top of the inner mold (4). The two sides of the inner side of module B (2) are symmetrically fixedly connected with buffer components B (6). The inner end of the buffer component B (6) is fixedly connected with a clip (7). The two clips (7) are symmetrical to each other. The middle of the two clips (7) is provided with an empty slot. A fixing block (8) is fixedly connected to the top outer side of module C (3). Screws (9) are provided at the four corners of module C (3). Module C (3) is fixedly connected to the bottom of module B (2) through screws (9). Screw holes A are provided at the four corners of the fixing block (8). Screw holes B are provided at the four corners of the bottom of module B (2). The top of the screw (9) passes through the screw hole A and is fixedly connected inside the screw hole B.

2. A cold heading die for forming a body of an automotive fuel injection nozzle according to claim 1, characterized in that: Module A (1) and Module B (2) are an integrated structure.

3. A cold heading die for forming a body of an automotive fuel injector nozzle as defined in claim 2, wherein: Both buffer A (5) and buffer B (6) are high-strength springs.

4. The cold heading die for an automobile engine nozzle body according to claim 1, characterized in that: The bottom of module A (1) is welded to the top of module B (2).

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