Cold heading forming die assembly of set bolt special for passenger car steering engine

Abstract

The utility model relates to a cold heading forming die assembly of a set bolt special for a passenger car steering engine, 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 a punching die, a punching needle positioned in the punching die, a main die and an ejector pin with one end arranged in the main die; a raw material is arranged in the main die cavity, one end of the ejector pin abuts against the raw material, the punch pin extrudes the raw material, and the raw material in the main die cavity is subjected to cold heading forming. The cold heading forming process of different stages is achieved through the five station dies; a punching needle head of the five-station die is a hexagonal punching rod, so that one end of a raw material is subjected to cold heading to form an inner hexagonal shape. According to the utility model, one-step forming of the inner hexagon of the fastening bolt can be realized, and subsequent machining treatment is not needed.

Description

Technical Field

[0001] This utility model relates to the field of passenger vehicle parts manufacturing technology, specifically a cold heading forming mold assembly for a special set bolt for passenger vehicle steering gear. Background Technology

[0002] In the passenger vehicle manufacturing sector, the steering gear, as a core component of the vehicle's steering system, directly affects the vehicle's safety and handling. The set bolt, as a crucial connecting part in the steering gear, has a significant impact on the overall performance of the steering gear due to its quality and manufacturing efficiency. Currently, the traditional production method for set bolts specifically designed for passenger vehicle steering gears often involves cold forging followed by stamping the internal hexagonal socket using a punch press. This production method is not only cumbersome but also requires a separate punch press and the necessary stamping dies, increasing production costs and processing time.

[0003] With the continuous development of cold heading technology and the widespread application of multi-station cold heading machines, people have begun to explore more efficient and economical production methods for set bolts. However, existing cold heading die assemblies still have some problems when processing set bolts for passenger car steering gears. For example, some die assemblies cannot achieve one-time forming of the internal hexagonal head and still require subsequent machining, which not only increases production costs but may also affect the accuracy and strength of the bolts. In addition, the structural design of some die assemblies is not reasonable enough, resulting in low production efficiency and making it difficult to meet the needs of large-scale production. Summary of the Invention

[0004] This utility model aims to overcome the defects of the prior art and provide a cold heading forming die assembly for a special set bolt for passenger car steering gear, solving the problem of needing to add additional processes and prepare stamping dies for the punch press separately.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] A cold heading forming die assembly for a set bolt for a passenger vehicle steering gear 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 a punch, a punch located within the punch, a main die, and an ejector pin with one end located within the main die. The raw material is placed in the cavity of the main die, one end of the ejector pin abuts against the raw material, and the punch extrudes the raw material, causing the raw material in the cavity of the main die to be cold-headed. The five die stations realize different stages of the cold heading forming process. The punch head of the fifth die is a hexagonal punch, which causes one end of the raw material to be cold-headed into an internal hexagonal shape.

[0007] The cold heading forming mold assembly for a special set bolt for a passenger vehicle steering gear is characterized in that: the mold at one station processes the raw material into a pre-formed bolt shank.

[0008] The cold heading forming die assembly for a special set bolt for a passenger vehicle steering gear is characterized in that: the two-station die further processes the bolt shank to form the preliminary shape of the ball head portion.

[0009] The cold heading forming die assembly for a special set bolt for a passenger vehicle steering gear is characterized in that: the three-station die precisely shapes the ball head portion while simultaneously beginning the initial extrusion of the internal hexagonal portion.

[0010] The cold heading forming die assembly for a special set bolt for a passenger vehicle steering gear is characterized in that: the four-station die continues to extrude the internal hexagonal portion.

[0011] The cold heading forming mold assembly for a special set bolt for a passenger vehicle steering gear is characterized in that: in the five-station mold, the bolt shank and ball head are formed in one step by elastic mold closing.

[0012] 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 forming die assembly for a special set bolt for passenger vehicle steering gears. By employing a multi-station cold heading machine and combining it with an optimized die structure design, continuous and efficient processing of the set bolt from raw materials to finished products is achieved. This change significantly improves production efficiency and shortens the production cycle, thereby better meeting the needs of large-scale production. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0014] Figure 1 This is a schematic diagram of a mold at one workstation.

[0015] Figure 2 This is a schematic diagram of a two-station mold.

[0016] Figure 3 This is a schematic diagram of a three-station mold.

[0017] Figure 4 This is a schematic diagram of a four-station mold.

[0018] Figure 5 This is a schematic diagram of a five-station mold. Detailed Implementation

[0019] 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.

[0020] like Figure 1-5 The image shows a cold heading forming die assembly for a set bolt for a passenger vehicle steering gear. It includes 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 a punch 1, a punch 2 located within the punch 1, a main die 3, and an ejector pin 4 with one end located within the main die. Raw material 5 is placed within the cavity 6 of the main die. One end of the ejector pin abuts against the raw material, and the punch squeezes the raw material, causing it to be cold-headed within the cavity of the main die. The five die stations achieve different stages of the cold heading process. The punch head of the fifth-station die is a hexagonal punch, causing one end of the raw material to be cold-headed into an internal hexagonal shape.

[0021] The first-stage mold processes the raw materials into a preliminary bolt rod.

[0022] The two-station mold further processes the bolt shank to form the preliminary shape of the ball head portion.

[0023] The three-station mold precisely shapes the ball head portion while simultaneously beginning the initial extrusion of the internal hexagon portion.

[0024] The four-station mold continues to extrude the internal hexagonal portion.

[0025] Because the internal hexagonal joints are formed in one step, no subsequent machining is required, which greatly reduces production costs. At the same time, the use of flexible mold closing technology also reduces mold damage during the mold closing process, extends the mold's service life, and further reduces production costs.

[0026] In the five-station mold, the φ7.5 bolt shank and φ10 ball head are formed in one step through elastic mold closing.

[0027] Elastic mold-closing technology introduces elastic elements into the mold structure, enabling a buffering effect between the upper and lower molds during the mold-closing process, thereby avoiding rigid collisions. These elastic elements are typically made of elastic materials such as nylon and silicone, which can undergo elastic deformation when subjected to external forces and return to their original shape after the external force is removed.

[0028] The optimized design of the mold components ensures the precision and strength of the set bolts during the cold heading process. The one-step forming of the internal hexagonal socket avoids errors and deformations that may arise from subsequent processing, thereby improving the product's quality stability and reliability.

[0029] 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 set bolt specifically designed for passenger vehicle steering gears, characterized in that: It includes interchangeable one-station molds, two-station molds, three-station molds, four-station molds, and five-station molds. Each of the five molds includes a punch, a punch located inside the punch, a main mold, and an ejector pin with one end located inside the main mold. The raw material is placed in the cavity of the main mold, one end of the ejector pin abuts against the raw material, and the punch squeezes the raw material, so that the raw material in the cavity of the main mold is cold-forged. The five molds realize different stages of cold-forging process. The punch head of the five-station mold is a hexagonal punch, so that one end of the raw material is cold-forged into an internal hexagonal shape.

2. The cold heading die assembly for a set bolt for a passenger vehicle steering gear according to claim 1, characterized in that: The first-stage mold processes the raw materials into a preliminary bolt rod.

3. The cold heading die assembly for a set bolt for a passenger vehicle steering gear according to claim 1, characterized in that: The two-station mold further processes the bolt shank to form the preliminary shape of the ball head portion.

4. The cold heading die assembly for a set bolt for a passenger vehicle steering gear according to claim 1, characterized in that: The three-station mold precisely shapes the ball head portion while simultaneously beginning the initial extrusion of the internal hexagon portion.

5. The cold heading die assembly for a set bolt for a passenger vehicle steering gear according to claim 1, characterized in that: The four-station mold continues to extrude the internal hexagonal portion.

6. A cold heading die assembly for a set bolt for a passenger vehicle steering gear according to any one of claims 1-5, characterized in that: In the five-station mold, the bolt shank and ball head are formed in one step through elastic mold closing.

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