Cold heading die assembly for car connecting sleeve

Abstract

The utility model relates to a car connecting sleeve cold heading die assembly which comprises a first station die, a second station die, a third station die, a fourth station die and a fifth station die which are mutually replaced, and each of the five station dies comprises an upper die, a lower die, an ejection sleeve, a lower die ejector pin and a lower die cushion block; and the cold heading forming process of different stages is achieved through the five station dies. By means of the die, production of large cold forging products is achieved, high-efficiency production of large deformation products is achieved, production efficiency can be improved by multiple times, and a large number of raw materials are saved. The product is formed by cold forging, and no machining is needed.

Description

Technical Field

[0001] This utility model relates to the field of basic component manufacturing, specifically a cold heading mold assembly for a car connecting sleeve. Background Technology

[0002] Car connecting sleeves, as a type of rear-mounted threaded pipe for suspension, have a complex structure and are not typical parts. Their main characteristics include a large difference between the blank diameter and the flange end diameter, difficulty in deformation, a thin head, and a deep inner bore. These characteristics result in extremely high resistance to deformation, making their manufacturing process particularly complex.

[0003] In traditional manufacturing processes, this product is primarily produced through full machining, including turning and drilling. However, this process has significant drawbacks. First, common cold heading techniques cannot produce ultra-thin flanges; the larger the flange, the more difficult it is to guarantee its thickness accuracy. Therefore, in actual production, it is usually necessary to allow for flange thickness in advance and then compensate for the shortcomings of traditional cold heading techniques by machining the flange thickness later.

[0004] Secondly, traditional cold heading technology cannot produce inner holes beyond the limit. Especially when the inner hole depth reaches 3.2 times the limit depth, the accuracy of the inner hole cannot be guaranteed. Therefore, subsequent machining drilling is still necessary to compensate for this deficiency.

[0005] In conclusion, the traditional combination of cold heading and machining is not only costly but also inefficient, failing to meet the demands of large-volume order fulfillment. Therefore, a new production process is urgently needed to address these issues, improving efficiency, reducing costs, and ensuring product quality. Summary of the Invention

[0006] The present invention aims to overcome the defects of the prior art and provide a cold heading mold assembly for car connecting sleeves, thereby solving the above-mentioned technical problems.

[0007] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0008] A cold heading die assembly for a car connecting sleeve is characterized by comprising five interchangeable die stations: a first-station die, a second-station die, a third-station die, a fourth-station die, and a fifth-station die. Each die station includes an upper die, an upper die ejector pin located within the upper die, a lower die, an ejector sleeve, a lower die ejector pin located within the lower die, a lower die pad, and a forming die. The lower die ejector pin has an ejector sleeve outside it. The material is placed inside the forming die. One end of the lower die ejector pin abuts against the material, and the upper die ejector pin squeezes the material, causing the material in the forming die to be cold-headed into a workpiece. The five die stations realize different stages of the cold heading forming process.

[0009] The cold heading die assembly for a car connecting sleeve is characterized in that: the first station die has a mold that matches the shape of the inner hole of the car connecting sleeve, and the first station die adopts a positive extrusion method to deform the material by drawing holes to form the initial inner hole structure.

[0010] The aforementioned cold heading die assembly for a car connecting sleeve is characterized in that: the two-station die adopts a positive extrusion method to shape the material after processing at the first station into a mushroom head shape.

[0011] The aforementioned cold heading die assembly for a car connecting sleeve is characterized in that: the three-station die applies force in the positive extrusion direction to flatten and round the mushroom head.

[0012] The aforementioned cold heading die assembly for a car connecting sleeve is characterized in that: the four-station die performs precision punching and extrusion on the ultra-thin flange head to achieve the final extrusion forming of the flange head.

[0013] The aforementioned cold heading die assembly for a car connecting sleeve is characterized in that: the five-station die is composed of an upper die, a lower die, and a lower die ejector pin die, and applies downward force through reverse extrusion to punch out the waste material at the inner hole of the flange, thereby processing a through hole and completing the final forming of the product.

[0014] The aforementioned cold heading mold assembly for car connecting sleeves is characterized in that: it further includes a transfer mechanism for automatically transferring materials, and each station mold is configured on a cold heading machine equipped with a transfer mechanism;

[0015] The aforementioned cold heading die assembly for a car connecting sleeve is characterized in that: the first-station die, the second-station die, the third-station die, the fourth-station die, and the fifth-station die are all made of cemented carbide.

[0016] The beneficial effects of this utility model are as follows: As can be seen from the above technical solution, this application provides a cold heading die assembly for car connecting sleeves. This die assembly enables the production of large cold-forged products, achieving high-efficiency production of products with large deformation, increasing production efficiency several times and saving a significant amount of raw materials. It allows the product to be formed using cold forging, eliminating the need for any machining. It completely replaces the original processing methods. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of a mold at one workstation.

[0019] Figure 2 This is a schematic diagram of a two-station mold.

[0020] Figure 3This is a schematic diagram of a three-station mold.

[0021] Figure 4 This is a schematic diagram of a four-station mold.

[0022] Figure 5 This is a schematic diagram of a five-station mold. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0024] like Figure 1-5 The image shows a cold heading die assembly for car connecting sleeves, comprising five interchangeable die stations: a first-station die, a second-station die, a third-station die, a fourth-station die, and a fifth-station die. Each die station includes an upper die 1, an upper die ejector pin 6 located within the upper die, a lower die 2, an ejector sleeve 3, a lower die ejector pin 4 located within the lower die, a lower die pad 5, and a forming die 7. The lower die ejector pin has an ejector sleeve externally. The material is placed within the forming die, with one end of the lower die ejector pin abutting against the material. The upper die ejector pin compresses the material, causing the material within the forming die to be cold-headed into a workpiece. The five die stations realize different stages of the cold heading forming process. This die structure enables the direct production of car connecting sleeves on a multi-station cold heading machine without subsequent machining.

[0025] The first-station mold has a cavity that matches the shape of the inner hole of the car connecting sleeve. The first-station mold uses a positive extrusion method to deform the material by drawing holes φ10 to form the initial inner hole structure.

[0026] The two-station mold includes a shaping core and a shaping die. The shaping core and the shaping die cooperate with each other and use a positive extrusion method to shape the material after the first station processing into a mushroom head shape, preparing it for subsequent flange forming.

[0027] The three-station mold includes a flattening and rounding mold core and a flattening and rounding mold. Within a closed space, force is applied in the positive extrusion direction to flatten and round the mushroom head, achieving a shape close to the final flange size, reaching φ37.8*2.8. This simultaneously prevents cracks or deformation of the flange head.

[0028] The four-station mold includes a blanking die core and a blanking die. The blanking die core has a cutting edge that matches the shape of the flange inner hole. In a closed space, the ultra-thin flange head is finely blanked and extruded to achieve the final extrusion forming of the φ38mm×2.5mm ultra-thin flange head.

[0029] The five-station mold, consisting of an upper mold, a lower mold, and a lower mold ejector pin, applies downward force through reverse extrusion to punch out the waste material in the inner hole of the flange, thus machining a through hole of φ10mm and completing the final forming of the product.

[0030] It also includes a transfer mechanism for automatically transferring materials, with each station mold mounted on a cold heading machine equipped with the transfer mechanism;

[0031] The molds at the first, second, third, fourth, and fifth stations are all made of cemented carbide, which improves the wear resistance and service life of the molds and reduces maintenance costs.

[0032] Due to the ultra-deep inner hole of this product, the inner hole depth reaches 3.2 times the limit hole depth. During production, a wire of a reasonable diameter is selected and squeezed through the hard alloy mold in the one-station mold to achieve hole deformation.

[0033] The wire head flange is pre-formed and flattened in a closed hard alloy mold using two-station and three-station molds, thus completing the entire forming process of the flange forming mold.

[0034] The wire head flange is precision punched and extruded in a closed hard alloy mold using a four-station mold to complete the entire forming process of the ultra-thin flange head.

[0035] The five-station mold consists of an upper mold push tube, a lower mold, and a lower mold ejector pin. These three molds are interlocked to form a continuous perforation mold combination, ensuring the product's shape while enabling continuous and rapid production.

[0036] The mold in this application is decomposed into multiple interconnected workstation components, each of which is responsible for a specific processing step, thereby realizing the modularization and standardization of the processing process.

[0037] A transfer mechanism was introduced to automatically transfer materials, reducing manual operation and improving production efficiency and processing accuracy.

[0038] By combining forward and reverse extrusion technologies at different workstations, precise control and shaping of materials are achieved, improving product quality and consistency.

[0039] By sequentially setting up workstation components and coordinating with the transfer mechanism, a continuous processing flow from raw materials to finished products is achieved, thereby improving production efficiency.

[0040] Ultra-thin flange forming technology: Especially in the four-station assembly, the precise forming of ultra-thin flanges is achieved through specially designed hard alloy upper and lower molds, solving the problem that it is difficult to process ultra-thin flanges in traditional processing methods.

[0041] The mold assembly features a rational overall structural design and tight connections between components, ensuring the stability and reliability of the processing. This mold assembly is suitable for producing automotive connecting sleeves of various specifications and sizes, demonstrating strong adaptability and flexibility.

[0042] The above are merely embodiments provided in this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cold heading die assembly for a car connecting sleeve, characterized in that: The system includes interchangeable one-station, two-station, three-station, four-station, and five-station molds. Each of the five molds includes an upper mold, an upper mold ejector pin located within the upper mold, a lower mold, an ejector sleeve, a lower mold ejector pin located within the lower mold, a lower mold pad, and a forming mold. The lower mold ejector pin has an ejector sleeve outside it. The material is placed inside the forming mold. One end of the lower mold ejector pin abuts against the material, and the upper mold ejector pin squeezes the material, causing the material in the forming mold to be cold-forged into a workpiece. The five molds realize different stages of the cold forging process. The first-station mold has a shape that matches the shape of the inner hole of the car connecting sleeve. The first-station mold adopts a positive extrusion method to deform the material by drawing holes to form the initial inner hole structure. The second-station mold uses a positive extrusion method to shape the material after processing at the first station into a mushroom head shape; the third-station mold applies force in the positive extrusion direction to flatten and round the mushroom head; the fourth-station mold performs precision punching and extrusion on the ultra-thin flange head to achieve the final extrusion forming of the flange head. The five-station mold, consisting of an upper mold, a lower mold, and a lower mold ejector pin, applies downward force through reverse extrusion to punch out waste material from the inner hole of the flange, thus creating a through hole and completing the final forming of the product.

2. The cold heading die assembly for a car connecting sleeve according to claim 1, characterized in that: It also includes a transfer mechanism for automatically transferring materials, with each station mold mounted on a cold heading machine equipped with the transfer mechanism.

3. The cold heading die assembly for a car connecting sleeve according to claim 1, characterized in that: The molds for the first, second, third, fourth, and fifth workstations are all made of cemented carbide.

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