Manufacturing method of six-station cold extrusion of hexagonal socket T-nut blank for automobile engine

Abstract

The application provides a six-station cold extrusion manufacturing method for an internal hexagonal T-shaped nut blank for an automobile engine. The internal hexagonal T-shaped nut blank for the automobile engine is directly manufactured through a six-station cold extrusion die. Through the method, the utilization rate and quality of raw materials can be improved, and the production efficiency can be improved. In addition, the appearance quality is high, and the product strength is high.

Description

Technical Field

[0001] This invention relates to the field of multi-station cold heading technology, specifically to a six-station cold extrusion manufacturing method for an internal hexagonal T-nut blank for automobile engines. Background Technology

[0002] The internal hexagonal T-nut for automobile engines is an important fastening component in the automobile engine assembly.

[0003] The external structure of the automotive engine hexagonal T-nut includes a main cylinder and a head frustum located at the upper end of the main cylinder, with a central through hole; the ratio of the thickness of the head frustum to the length of the main cylinder is 0.2-0.3:1, the ratio of the outer diameter of the main cylinder to the diameter of the central through hole is 1:0.5-0.65, and the ratio of the outer diameter of the main cylinder to the head frustum is 0.75-0.8:1:1; the lower end of the central through hole is provided with an internal hexagonal connection configuration, the central through hole is provided with an internal thread above the hexagonal connection configuration, and the distance between opposite sides of the internal hexagon is smaller than the diameter of the central through hole, so that there is a concave arc surface on opposite sides of the internal hexagon, and the length of the internal hexagonal connection configuration accounts for 25%-35% of the total length of the central through hole.

[0004] Previously, due to the internal hexagonal T-nut for automobile engines containing an internal hexagonal connection configuration and the configuration of the internal hexagonal connection configuration with other shapes of the T-nut, it was mainly processed by turning, followed by drilling, reaming, punching hexagonal holes, and flat-head turning to roll the thread diameter. This process involved many steps, slow processing speed, large processing allowance, high cost, and low production efficiency. Summary of the Invention

[0005] The technical problem to be solved by this invention is to provide a six-station cold extrusion manufacturing method for automotive engine internal hexagonal T-nut blanks. This method enables the direct production of automotive engine internal hexagonal T-nut blanks via a six-station cold heading process, requiring only subsequent thread rolling. This improves production efficiency, reduces costs, and results in products with high strength and good appearance. To this end, this invention adopts the following technical solution:

[0006] A six-station cold extrusion manufacturing method for automotive engine hexagonal T-nut blanks is characterized in that the external structure of the automotive engine hexagonal T-nut blank includes a main cylinder and a head frustum located at the upper end of the main cylinder with a central through hole; the ratio of the thickness of the head frustum to the length of the main cylinder is 0.2-0.3:1, the ratio of the outer diameter of the main cylinder to the diameter of the central through hole is 1:0.5-0.65, and the ratio of the outer diameter of the main cylinder to the head frustum is 0.75-0.8:1:1; the lower end of the central through hole is provided with an internal hexagonal connection configuration, and the distance between opposite sides of the internal hexagon is smaller than the diameter of the central through hole, so that there is a concave arc surface on the opposite sides of the internal hexagon, and the length of the internal hexagonal connection configuration accounts for 25%-35% of the total length of the central through hole;

[0007] The manufacturing method includes the following steps:

[0008] (1) The coiled material is fed into the cold heading forming machine and automatically cut into individual automotive engine internal hexagon T-shaped nut blanks. The diameter of the coiled material is close to the diameter of the main cylinder.

[0009] (2) The raw material is transferred to the No. 1 mold opening of the cold heading forming machine. After cold heading in the No. 1 mold, the front end of the No. 1 molded product is flattened and the rear end is rounded and the center positioning hole is formed.

[0010] (3) Transfer the No. 1 molded product to the No. 2 mold opening. After cold heading in the No. 2 mold, the front end face of the No. 2 molded product is flattened and the diameter of the rear end center positioning hole of the original No. 1 molded product is enlarged to the diameter of the center through hole, forming the lower end base hole of the center through hole. The rear end of the No. 2 molded product is rounded and a positioning hole is formed. The length of the No. 2 molded product is slightly longer than the length of the No. 1 molded product.

[0011] (4) The No. 2 molded product is transferred to the No. 3 mold opening and cold-forged in the No. 3 mold to form the prototype of the head frustum at the front end of the No. 3 molded product. The prototype is a flat frustum with a thickness greater than that of the head frustum and a diameter smaller than that of the head frustum. The positioning hole at the rear end of the original No. 2 molded product is enlarged to the diameter of the central through hole to form the upper base hole of the central through hole. The rear part of the No. 3 molded product maintains the same diameter as the No. 2 molded product and its length is shorter than the length of the raw material and the blank of the internal hexagon T-nut for automobile engine. The No. 3 molded product becomes the prototype of the T-nut blank.

[0012] (5) The No. 3 molded product is moved to the No. 4 mold opening and cold-forged in the No. 4 mold. The head frustum of the No. 3 molded product is cold-forged and drilled to deepen the upper base hole to the depth of the iron core. The upper height of the iron core is predetermined to be lower than the upper height of the internal hexagonal connection configuration. The rear cylinder of the No. 3 molded product is extended to be consistent with the length of the main cylinder.

[0013] (6) The No. 4 molded product is transferred to the No. 5 mold opening and cold-forged in the No. 5 mold to reduce the thickness and increase the diameter of the head frustum prototype of the No. 4 molded product. The head frustum is then formed to produce the No. 5 molded product. The amount of metal transferred required to increase the diameter comes from the reduction in thickness.

[0014] (7) Move the No. 5 molded product to the No. 6 mold opening, pass the iron core through the No. 5 molded product to form the central through hole, and at the same time, cold extrude the rear end of the central through hole wall at six corners to form an internal hexagonal connection structure. Furthermore, the distance between opposite sides of the internal hexagonal is less than the diameter of the central through hole, so that there is a concave arc surface on opposite sides of the internal hexagonal, thus making an internal hexagonal T-shaped nut blank.

[0015] This invention, through a rational arrangement of workstations, enables the direct cold extrusion of automotive engine T-nut blanks using a six-station cold extrusion manufacturing method. The blanks are formed directly by continuous cold extrusion in a six-station cold extrusion machine, requiring only thread rolling to obtain the finished product. This improves the product's mechanical properties, enhances its appearance, and ensures product quality. Compared to the original process, this invention eliminates multiple processing steps using different machinery. The original method required 50g of material, while the improved method requires only 23.1g, saving 53.8% of material. Employing multi-station cold heading continuous forming production, the production speed can reach 60 pieces per minute, with an average daily output of 23,040 pieces, significantly improving production efficiency and reducing investment costs in manpower and materials. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the manufacturing process of the present invention.

[0017] Figure 2 This is a bottom view of the fifth molded product of the present invention. Implementation

[0018] Referring to the accompanying drawings, the automotive engine T-nut blank to be manufactured according to the present invention includes a main cylinder 601 and a head frustum 602 located at the upper end of the main cylinder 601, with a central through hole 603. The ratio of the thickness of the head frustum 602 to the length of the main cylinder 601 is 0.2-0.3:1, the ratio of the outer diameter of the main cylinder 601 to the diameter of the central through hole 603 is 1:0.5-0.65, and the ratio of the outer diameter of the main cylinder 601 to the outer diameter of the head frustum 602 is 0.75-0.8:1. The lower end of the central through hole 603 is provided with an internal hexagonal connection configuration 604, and the distance between the opposite sides 605 of the internal hexagonal is less than the diameter of the central through hole 603, so that there is a concave arc surface 606 on the opposite sides 605 of the internal hexagonal. The length of the internal hexagonal connection configuration 604 accounts for 25%-35% of the total length of the central through hole 603. The finished hexagonal T-nut for automobile engines can be obtained by rolling the center through hole 603 of the blank.

[0019] The six-station cold extrusion manufacturing method for the automotive engine internal hexagon T-nut blank 600 of the present invention includes the following steps:

[0020] (1) The coiled material is fed into a cold heading machine and automatically cut into individual blanks 1 for automotive engine hexagonal T-nuts. The diameter of the coiled material is close to the diameter of the main cylinder 601, preferably slightly smaller than the main cylinder 601. The difference matches the slightly increased diameter of the die. During the subsequent six cold heading processes, the diameter of the part corresponding to the main cylinder naturally increases to the diameter of the main cylinder 601 with each die pass, resulting in a smoother appearance for the final product. The length of the blank 1 is close to the length of the automotive engine hexagonal T-nut blank. Specifically, it depends on the diameter of the blank and can be equal, slightly longer, or slightly shorter.

[0021] (2) The raw material 1 is transferred to the first mold opening of the cold heading forming machine. After cold heading in the first mold, the front end of the first molded product 100 is flattened and the rear end is rounded 101 and central positioning hole 102 is formed.

[0022] (3) The No. 1 molded product 100 is transferred to the No. 2 mold opening. After cold heading in the No. 2 mold, the front end face of the No. 2 molded product 200 is flattened and the diameter of the rear end center positioning hole 102 of the original No. 1 molded product 100 is enlarged to the diameter of the center through hole 603, forming the lower end base hole 201 of the center through hole 604. The base hole 201 is shallow, but it already has a straight section of the hole. After cold heading in the No. 2 mold, the rear end of the No. 2 molded product 200 is also rounded 202 and the center positioning hole 203 is formed. The length of the No. 2 molded product 200 is slightly longer than the length of the No. 1 molded product 100.

[0023] (4) The No. 2 molded product is transferred to the No. 3 mold opening. After cold forging in the No. 3 mold, the front end of the No. 3 molded product 300 is forged into the prototype 301 of the head frustum. The prototype 301 is a flat frustum with a thickness greater than that of the head frustum 602 and a diameter smaller than that of the head frustum 602. The rear end center positioning hole 203 of the original No. 2 molded product 200 is enlarged to the diameter of the center through hole to form the upper base hole 302 of the center through hole. The base hole 302 is shallower and less than the thickness of the head frustum 602, but it already has a straight section of the hole. The rear part of the No. 3 molded product 300 maintains the same diameter as the No. 2 molded product, with only a slight difference in diameter caused by the mold. The length of the No. 3 molded product 300 is shorter than the length of the raw material 1 and the blank of the internal hexagon T-nut for automobile engine. The No. 3 molded product 300 becomes the prototype of the T-nut blank.

[0024] (5) The No. 3 molded product is transferred to the No. 4 mold opening. After cold heading in the No. 4 mold, the head frustum prototype 301 of the No. 3 molded product 300 is cold-headed and drilled, so that the upper base hole 302 is deepened to the depth of the iron core, named the central through hole main body section 402. The upper height of the iron core 6 is predetermined to be lower than the upper height of the internal hexagonal connection configuration 604. The amount of metal transferred by the drilling is used to increase the rear cylinder of the No. 3 molded product, so that the rear cylinder of the No. 4 molded product 400 is extended to be consistent with the length of the main body cylinder 601, forming the main body cylinder 601. The diameter of the head frustum prototype 401 of the No. 4 molded product 400 is only slightly increased by the mold due to the overlay, and the thickness is not increased.

[0025] (6) The No. 4 molded product 400 is transferred to the No. 5 mold opening. After cold heading in the No. 5 mold, the thickness of the head frustum prototype 401 of the No. 4 molded product is reduced and the diameter is increased. The amount of metal transferred required to increase the diameter is not taken from the main cylinder 601 of the No. 4 molded product, but from the reduction in thickness. The head frustum 602 is formed to make the No. 5 molded product 500. The diameter of the main cylinder 601 of the No. 5 molded product 500 and the main cylinder 601 of the No. 4 molded product are only slightly different due to the mold.

[0026] (7) The No. 5 molded product 500 is moved to the No. 6 mold opening, and the No. 5 molded product 500 is passed through the iron core 6 to form the central through hole 603. At the same time, the rear end of the central through hole 600, which includes the part where the iron core 6 is located, is cold-extruded at six corners to form an internal hexagonal connection configuration 604. The distance between the opposite sides 605 of the internal hexagon is smaller than the diameter of the central through hole 603, so that there is a concave arc surface 606 on the opposite sides 605 of the internal hexagon. Compared with the No. 5 molded product 500, the diameter changes of the head frustum 602 and the main body cylinder 601 are only minor changes caused by the mold, thus producing an internal hexagonal T-shaped nut blank.

[0027] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the protection scope of the present invention.

Claims

1. A six-station cold extrusion manufacturing method for automotive engine internal hexagonal T-nut blanks, characterized in that... The external structure of the automotive engine internal hexagon T-nut blank includes a main cylinder and a head frustum located at the upper end of the main cylinder, with a central through hole; the ratio of the thickness of the head frustum to the length of the main cylinder is 0.2-0.3:1, the ratio of the outer diameter of the main cylinder to the diameter of the central through hole is 1:0.5-0.65, and the ratio of the outer diameter of the main cylinder to the head frustum is 0.75-0.8:1; the lower end of the central through hole is provided with an internal hexagon connection configuration, and the distance between opposite sides of the internal hexagon is smaller than the diameter of the central through hole, so that there is a concave arc surface on opposite sides of the internal hexagon, and the length of the internal hexagon connection configuration accounts for 25%-35% of the total length of the central through hole; The manufacturing method includes the following steps: (1) The coiled material is fed into the cold heading forming machine and automatically cut into individual automotive engine internal hexagon T-shaped nut blanks. The diameter of the coiled material is close to the diameter of the main cylinder. (2) The raw material is transferred to the No. 1 mold opening of the cold heading forming machine. After cold heading in the No. 1 mold, the front end of the No. 1 molded product is flattened and the rear end is rounded and the center positioning hole is formed. (3) Transfer the No. 1 molded product to the No. 2 mold opening. After cold heading in the No. 2 mold, the front end face of the No. 2 molded product is flattened and the diameter of the rear end center positioning hole of the original No. 1 molded product is enlarged to the diameter of the center through hole, forming the lower end base hole of the center through hole. The rear end of the No. 2 molded product is rounded and a positioning hole is formed. The length of the No. 2 molded product is slightly longer than the length of the No. 1 molded product. (4) The No. 2 molded product is transferred to the No. 3 mold opening and cold-forged in the No. 3 mold to form the prototype of the head frustum at the front end of the No. 3 molded product. The prototype is a flat frustum with a thickness greater than that of the head frustum and a diameter smaller than that of the head frustum. The positioning hole at the rear end of the original No. 2 molded product is enlarged to the diameter of the central through hole to form the upper base hole of the central through hole. The rear part of the No. 3 molded product maintains the same diameter as the No. 2 molded product and its length is shorter than the length of the raw material and the blank of the internal hexagon T-nut for automobile engine. The No. 3 molded product becomes the prototype of the T-nut blank. (5) The No. 3 molded product is moved to the No. 4 mold opening and cold-forged in the No. 4 mold. The head frustum of the No. 3 molded product is cold-forged and drilled to deepen the upper base hole to the depth of the iron core. The upper height of the iron core is predetermined to be lower than the upper height of the internal hexagonal connection configuration. The rear cylinder of the No. 3 molded product is extended to be consistent with the length of the main cylinder. (6) The No. 4 molded product is transferred to the No. 5 mold opening and cold-forged in the No. 5 mold to reduce the thickness and increase the diameter of the head frustum prototype of the No. 4 molded product. The head frustum is then formed to produce the No. 5 molded product. The amount of metal transferred required to increase the diameter comes from the reduction in thickness. (7) Move the No. 5 molded product to the No. 6 mold opening, pass the iron core through the No. 5 molded product to form the central through hole, and at the same time, cold extrude the rear end of the central through hole wall at six corners to form an internal hexagonal connection structure. Furthermore, the distance between opposite sides of the internal hexagonal is less than the diameter of the central through hole, so that there is a concave arc surface on opposite sides of the internal hexagonal, thus making an internal hexagonal T-shaped nut blank.

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