Cold heading die assembly for car suspension beam connecting sleeve

Abstract

The utility model relates to a car suspension beam connecting sleeve cold heading die assembly which comprises a first station die, a second station die, a third station die and a fourth station die which are mutually replaced, and each of the four station dies comprises an upper die, an upper die ejector pin located in the upper die, a lower die, a lower die ejector pin located in the lower die and a shape die. A raw material is arranged in the forming die, one end of the lower die ejector pin abuts against the material, the upper die ejector pin extrudes the raw material, and the raw material in the forming die is subjected to cold heading to form a workpiece; and the cold heading forming process of different stages is achieved through the four station dies. Complete cold forging forming of the product is achieved through the die, and the mode that cold heading and a machining machine are combined is broken through.

Description

Technical Field

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

[0002] The suspension beam connecting sleeve for passenger cars is a complex automotive component characterized by its extremely deep inner bore, reaching a maximum depth of 63mm, while also requiring a large diameter and thin head. This ultra-deep inner bore design presents significant challenges to production.

[0003] In traditional manufacturing methods, this product is typically produced using a combination of cold heading and machining. Cold heading is primarily used to deform the product's contours; however, due to the excessive depth of the inner hole, reaching 4.7 to 4.8 times the material diameter, traditional cold heading cannot directly machine such deep holes. Therefore, after cold heading, machining drilling is required to ensure the accuracy and dimensional requirements of the inner hole.

[0004] However, this combined processing method has many drawbacks. First, the processing cost is high because the machining process requires additional equipment and labor. Second, production efficiency is low, making it unable to meet the rapid delivery requirements of large-volume orders. Furthermore, there is significant waste of raw materials, as a large amount of waste is generated during the machining process. Summary of the Invention

[0005] This utility model aims to overcome the defects of the prior art and provide a cold heading mold assembly for car suspension beam connecting sleeves, solving the problem that traditional processing methods cannot effectively produce car suspension beam connecting sleeves with ultra-limit inner hole depths (up to 63mm).

[0006] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0007] A cold heading die assembly for a car suspension beam connecting sleeve is characterized in that it includes a first-station die, a second-station die, a third-station die, and a fourth-station die that can be replaced with each other. Each of the four die positions includes an upper die, an upper die ejector pin located in the upper die, a lower die, a lower die ejector pin located in the lower die, and a forming die. The raw material is placed in the forming die, one end of the lower die ejector pin abuts against the material, and the upper die ejector pin squeezes the raw material, so that the raw material in the forming die is cold-headed to form a workpiece. The four die positions realize different stages of the cold heading forming process.

[0008] The cold heading die assembly for a car suspension beam connecting sleeve is characterized in that: the die at one station uses positive extrusion to shape the raw material, transforming the raw material into a mushroom head shape.

[0009] The cold heading die assembly for a car suspension beam connecting sleeve is characterized in that: the two-station die adopts positive extrusion to further shape the shaped material, so that one end of the material has an opening and opens outward.

[0010] The aforementioned cold heading die assembly for a car suspension beam connecting sleeve is characterized in that: the three-station die uses positive extrusion to perform the first inner hole stretching on the opening.

[0011] The aforementioned cold heading die assembly for a car suspension beam connecting sleeve is characterized in that: the four-station die uses a positive extrusion method to achieve a second inner hole deepening and stretching, forming a car suspension beam connecting sleeve with an inner hole depth of 63mm.

[0012] The aforementioned cold heading mold assembly for a car suspension beam connecting sleeve 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.

[0013] The aforementioned cold heading die assembly for a car suspension beam connecting sleeve is characterized in that: the first-station die, the second-station die, the third-station die, and the fourth-station die are all made of cemented carbide.

[0014] The beneficial effects of this utility model are as follows: As can be seen from the above technical solution, this application provides a cold forging die assembly for a car suspension beam connecting sleeve, which realizes the complete cold forging of the product. Attached Figure Description

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0016] Figure 1 This is a schematic diagram of a mold at one workstation.

[0017] Figure 2 This is a schematic diagram of a two-station mold.

[0018] Figure 3 This is a schematic diagram of a three-station mold.

[0019] Figure 4 This is a schematic diagram of a four-station mold. Detailed Implementation

[0020] 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.

[0021] like Figure 1-4As shown: A cold heading die assembly for a car suspension beam connecting sleeve includes a first-station die, a second-station die, a third-station die, and a fourth-station die that can be replaced with each other. Each of the four die positions includes an upper die 1, an upper die ejector pin 2 located in the upper die, a lower die 3, a lower die ejector pin 4 located in the lower die, and a forming die 5. The raw material 6 is placed in the forming die, one end of the lower die ejector pin abuts against the material, and the upper die ejector pin squeezes the raw material, so that the raw material in the forming die is cold-headed to form a workpiece. The four die positions realize the cold heading forming process at different stages.

[0022] The first-stage mold uses positive extrusion to shape the raw material, transforming it into a mushroom shape, thus providing a suitable initial shape for subsequent stages.

[0023] The two-station mold adopts positive extrusion to further shape the shaped material, so that one end of the material has an opening and opens outward, deforming into a φ38 shape, providing the necessary pre-deformation for subsequent inner hole stretching.

[0024] The three-station mold uses positive extrusion to stretch the opening for the first time to form a semi-finished product with an inner hole length of φ13.32×H26. This step reduces the subsequent hole stretching depth by pre-stretching the hole and distributes the forming force, laying the foundation for achieving the ultimate hole depth.

[0025] The four-station mold uses a positive extrusion method to achieve a second inner hole deepening and stretching, forming a final size of φ13.32×H63 that meets the requirements. This step breaks through the limit of traditional hole depth processing by further stretching, and completes the ultra-limit inner hole depth processing of the car suspension beam connecting sleeve, finally producing a car suspension beam connecting sleeve with an ultra-limit inner hole depth of 63mm.

[0026] Through continuous cold heading at four workstations, automotive suspension beam connecting sleeves that meet the requirements can be produced directly without any machining steps, significantly improving production efficiency and shortening the production cycle.

[0027] This application avoids the need for machining and drilling in traditional processing methods, reducing equipment investment and labor time consumption, thereby lowering processing costs. At the same time, by reducing waste generation, the utilization rate of raw materials is improved, further reducing material costs.

[0028] By employing cold heading for internal hole stretching, the effects of cutting heat and forces generated during machining on material properties are avoided, thus improving the product's mechanical properties and dimensional accuracy. Furthermore, achieving ultra-limit internal hole depths through gradual stretching effectively reduces the risk of material deformation and cracking, thereby increasing product yield and reliability.

[0029] The mold design is flexible, and the mold shape and stretching gap of each station can be adjusted according to the needs of different products, so as to realize multiple uses of one machine and improve the utilization rate and flexibility of the equipment.

[0030] Due to the ultra-deep inner hole of this product, the inner hole depth reaches 4.8 times the limit hole depth, which cannot be produced by conventional processing methods. Therefore, the first pre-pulling of the hole at the third station is 2.5 times to reduce the subsequent hole pulling depth, and then the second hole pulling at the fourth station is to achieve the required 4.8 times limit hole depth. This application breaks through the traditional hole depth processing limit by stretching the inner hole multiple times on the semi-finished mold and distributing the forming force of each station, thus solving the problem of increasing the hole length.

[0031] 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 suspension beam connecting sleeve, characterized in that: It includes interchangeable one-station molds, two-station molds, three-station molds, and four-station molds. Each of the four molds includes an upper mold, an upper mold ejector pin located in the upper mold, a lower mold, a lower mold ejector pin located in the lower mold, and a forming mold. The raw material is placed in the forming mold, one end of the lower mold ejector pin abuts against the material, and the upper mold ejector pin squeezes the raw material, so that the raw material in the forming mold is cold-forged into a workpiece. The four molds realize different stages of cold forging process. The three-station mold uses positive extrusion to stretch the inner hole of the opening for the first time. The four-station mold uses a positive extrusion method to achieve a second inner hole deepening and stretching, forming a car suspension beam connecting sleeve with an inner hole depth of 63mm.

2. The cold heading die assembly for a car suspension beam connecting sleeve according to claim 1, characterized in that: The first-station mold uses positive extrusion to shape the raw material, transforming it into a mushroom head shape.

3. The cold heading die assembly for a car suspension beam connecting sleeve according to claim 1, characterized in that: The two-station mold uses positive extrusion to further shape the shaped material, so that one end of the material has an opening that opens outward.

4. A cold heading die assembly for a car suspension beam connecting sleeve according to any one of claims 1-3, 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.

5. A cold heading die assembly for a car suspension beam connecting sleeve according to any one of claims 1-3, characterized in that: The molds at the first, second, third, and fourth workstations are all made of cemented carbide.

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