Six-station cold extrusion manufacturing method of T-shaped sleeve nut for fixing automobile chassis

Abstract

The present invention provides a six-station cold extrusion manufacturing method for a T-shaped sleeve nut used for fixing an automobile chassis. Through cold extrusion six-die manufacturing, the T-shaped sleeve nut used for fixing an automobile chassis is directly manufactured. By the method of the present invention, the utilization rate and quality of raw materials can be improved, the production efficiency can be increased, and moreover, the appearance quality is high and the product strength is high.

Description

Technical Field

[0001] The present invention relates to the technical field of multi-station cold heading, and particularly to a manufacturing method for a T-shaped sleeve nut for fixing an automotive chassis. Background Art

[0002] The T-shaped sleeve nut for fixing an automotive chassis is an important fastener in the automotive chassis fixing system. The outer shape structure of the T-shaped sleeve nut for fixing an automotive chassis includes a cylindrical main body rod, and at the front end of the cylindrical main body rod is a flange head. The flange head includes a flat cylindrical main body of the flange head and a rear circular flange piece protruding laterally at the rear end of the flat cylindrical main body. The diameter of the flat cylindrical main body is 75-85% of the diameter of the circular flange piece. The diameter of the cylindrical main body rod is 37-50% of the diameter of the flat cylindrical main body. There is a central blind hole from the flange head to the inside of the cylindrical main body rod. The depth of the central blind hole is 78-90% of the total length of the T-shaped sleeve nut for fixing an automotive chassis. The diameter of the central blind hole is 45-55% of the diameter of the cylindrical main body rod. The length of the central blind hole is 95-105% of the length of the cylindrical main body rod.

[0003] In the past, for the T-shaped sleeve nut for fixing an automotive chassis, machining was mainly used, resulting in slow processing speed, high cost, and a lot of material waste. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a manufacturing method for a T-shaped sleeve nut for fixing an automotive chassis, which can directly produce the T-shaped sleeve nut for fixing an automotive chassis by a multi-station cold extrusion method, improve the utilization rate and quality of raw materials, and improve production efficiency. To this end, the present invention adopts the following technical solutions:

[0005] A six-station cold extrusion manufacturing method for a T-shaped sleeve nut for fixing an automotive chassis, characterized in that the outer shape structure of the T-shaped sleeve nut for fixing an automotive chassis includes a cylindrical main body rod, and at the front end of the cylindrical main body rod is a flange head. The flange head includes a flat cylindrical main body of the flange head and a rear circular flange piece protruding laterally at the rear end of the flat cylindrical main body. The diameter of the flat cylindrical main body is 75-85% of the diameter of the circular flange piece. The diameter of the cylindrical main body rod is 37-50% of the diameter of the flat cylindrical main body. There is a central blind hole from the flange head to the inside of the cylindrical main body rod. The depth of the central blind hole is 78-90% of the total length of the T-shaped sleeve nut for fixing an automotive chassis. The diameter of the central blind hole is 45-55% of the diameter of the cylindrical main body rod. The length of the central blind hole is 95-105% of the length of the cylindrical main body rod;

[0006] The manufacturing method includes the following steps:

[0007] (1) Feed the coiled round material into the cold heading forming machine to automatically cut it into individual raw material parts for the T-shaped sleeve nuts used for fixing the vehicle chassis. The diameter of the coiled round material is larger than the diameter of the cylindrical main body rod, and the length of the raw material part is longer than the length of the T-shaped sleeve nut.

[0008] (2) Transfer the raw material part to the first die opening of the cold heading forming machine. Through cold heading manufacturing in the first die, the rear end of the finished product of the first die is rod-bound. The length of the rod-bound section is basically equal to the length of the non-rod-bound part in the front. The rod section of the non-rod-bound part in the front and the rod-bound section are transitioned through a transition surface. The diameter of the rod-bound section is the same as that of the cylindrical main body rod.

[0009] (3) Translate the finished product of the first die to the second die opening. Through cold heading manufacturing in the second die, pre-heading the large end head of the non-rod-bound rod section of the finished product of the first die, so that the pre-headed large end head forms a frustum of a cone. The diameter of the rear end of the frustum of the cone is larger than the diameter of the non-rod-bound rod section, and the diameter of the front end is smaller than the diameter of the flat cylindrical main body. And a convex arc is formed at the rear end. The die surface line of the second die is located at the rear end face of the frustum of the cone-shaped large end head.

[0010] (4) Translate the finished product of the second die to the third die opening. In the third die, further upset and flatten the pre-headed large end head. The diameter after upsetting is the same as the diameter of the flat cylindrical main body, and the height after flattening is basically the same as the height of the flange head. And a center positioning hole is upset at the front end. For the third die, the finished product of the second die is all cold extruded in the main die.

[0011] (5) Translate the finished product of the third die to the fourth die opening. Through cold heading manufacturing in the fourth die, pre-heading the center blind hole on the basis of the center positioning hole of the finished product of the third die. The diameter of the center blind hole of the finished product of the fourth die is the same as the diameter of the center blind hole of the T-shaped sleeve nut. The center blind hole of the finished product of the fourth die does not exceed the large end head of the finished product of the fourth die, and the transferred metal amount is used to increase the length of the large end head, so that the large end head of the finished product of the fourth die is longer than the large end head of the finished product of the third die, and the diameter remains the same. For the fourth die, the finished product of the third die is all cold extruded in the main die.

[0012] (6) Translate the finished product of the fourth die to the fifth die opening. Through cold heading manufacturing in the fifth die, extend the center blind hole of the finished product of the fourth die to upset the center blind hole of the finished product of the fifth die, forming the cylindrical main body rod and the center blind hole section therein. The metal transfer amount formed by upsetting the center blind hole section is used to extend the length of the rod-bound section to make it reach the length of the cylindrical main body rod. For the fifth die, its die surface line is located in the middle of the large end head of the finished product of the fourth die.

[0013] (7) Translate the finished product of the fifth mold to the opening of the sixth mold. For the sixth mold, its die surface line is located at the rear end face of the large-end head of the finished product of the fifth mold. The sixth mold is provided with a mandrel and a rear ejector rod that match the diameter of the central blind hole. The mandrel is inserted at least into the main mold, and the ejector rod is placed at the rear end of the finished product of the fifth mold. Based on the mandrel hole protection, cold extrusion is performed on the large-end head of the finished product of the fifth mold to form the flat cylindrical body and the rear circular flange that protrudes laterally at the rear end of the flat cylindrical body, shaping it into the flange head, and manufacturing the T-shaped sleeve nut for fixing the vehicle chassis.

[0014] Through reasonable work station task arrangement, the present invention can continuously cold-extrude and form the T-shaped sleeve nut for fixing the vehicle chassis by a six-station cold extrusion manufacturing method. Only tapping the internal thread is required subsequently, which can improve the mechanical properties of the product and ensure the product quality. Compared with the original process, the present invention omits a large amount of turning process, can save materials, reduce costs, and has stable dimensions, improving production efficiency. Brief Description of the Drawings

[0015] Figure 1 It is a schematic process flow diagram of the manufacturing method of the present invention.

[0016] Figure 2 It is a cold heading schematic diagram of the sixth mold. Detailed Embodiments

[0017] Referring to the drawings, the external structure of the T-shaped sleeve nut for fixing the vehicle chassis manufactured by the present invention includes a cylindrical main body rod 61. At the front end of the cylindrical main body rod 61 is a flange head. The flange head includes a flat cylindrical body 621 of the flange head and a rear circular flange 622 that protrudes laterally at the rear end of the flat cylindrical body 621. The diameter of the flat cylindrical body 621 is 75-85% of the diameter of the circular flange 622. The diameter of the cylindrical main body rod 61 is 37-50% of the diameter of the flat cylindrical body 621. There is a central blind hole 63 from the flange head to the inside of the cylindrical main body rod 61. The depth of the central blind hole 63 is 78-90% of the total length of the T-shaped sleeve nut 100 for fixing the vehicle chassis. The diameter of the central blind hole 63 is 45-55% of the diameter of the cylindrical main body rod 61. The length of the central blind hole 63 is 95-105% of the length of the cylindrical main body rod 61.

[0018] The six-station cold extrusion manufacturing method uses wire rod for pre-heat treatment of spheroidization, then phosphate surface treatment and precision drawing and sizing treatment, and then performs cold extrusion manufacturing in the following steps:

[0019] (1) Feed the wire rod into the cold heading forming machine to automatically cut it into individual raw material parts 101 of the T-shaped sleeve nut for fixing the vehicle chassis. The diameter of the wire rod is larger than the diameter of the cylindrical main body rod 61, and the length of the raw material part 101 is longer than the length of the T-shaped sleeve nut 100.

[0020] (2) Transfer the raw material part 101 to the first die opening of the cold heading forming machine. Through cold heading manufacturing in the first die, the rear end of the finished product 1 of the first die is rod-bundled. The length of the rod-bundled section 11 is basically equal to the length of the non-rod-bundled front part. The rod section 12 of the non-rod-bundled front part and the rod-bundled section 11 are transitioned through a transition surface 13. The rod section 12 of the non-rod-bundled front part will be specifically used for forming the flange head, while the rod-bundled section 11 will be specifically used for forming the cylindrical main body rod 61. The diameter of the rod-bundled section 11 is consistent with that of the cylindrical main body rod 61, and in subsequent workstations, this diameter continues to remain consistent, with at most only a natural slight difference caused by the sleeve die. In this way, in combination with subsequent workstations and die features, the amount and distance of metal transfer required for cold extrusion forming are reduced.

[0021] (3) Translate the finished product 1 of the first die to the second die opening. Through cold heading manufacturing in the second die, pre-heading the large end head of the non-rod-bundled rod section 12 of the finished product 1 of the first die, so that the pre-headed large end head 21 forms a frustum of a cone shape. The diameter of the rear end of the frustum of a cone-shaped large end head 21 is larger than that of the non-rod-bundled rod section 12, and the diameter of the front end is smaller than that of the flat cylindrical main body 621. And a convex arc 211 is formed at the rear end. The die surface line of the second die is located at the rear end face of the frustum of a cone-shaped large end head 21.

[0022] (4) Translate the finished product 2 of the second die to the third die opening. In the third die, continue to upset and flatten the pre-headed large end head 21 into a flat cylindrical large end head 31. The diameter of the flat cylindrical large end head 31 is consistent with that of the flat cylindrical main body 621, and the height of the flat cylindrical large end head 31 is basically consistent with the height of the flange head. In this way, the amount of metal transfer required for subsequent forming of the flange piece 622 mainly comes from the amount of metal transferred when drilling a center blind hole in the flange head.

[0023] And, when upsetting and flattening, a center positioning hole 32 is upset at the front end of the flat cylindrical large end head 31. For the third die, the finished product 2 of the second die is all cold-extruded in the main die ( Figure 1 the die below the middle die surface line) of the third die;

[0024] (5) Translate the finished product 3 of the third mold to the opening of the fourth mold. Through cold heading manufacturing in the fourth mold, for the flat cylindrical large end head 31 of the finished product 3 of the third mold, based on the central positioning hole 32, pre-heading the central blind hole 63. The diameter of the central blind hole 42 of the finished product 4 of the fourth mold is the same as the diameter of the central blind hole 63 of the T-shaped sleeve nut. The central blind hole 42 of the finished product 4 of the fourth mold does not exceed the large end head 41 of the finished product 4 of the fourth mold, and the metal amount transferred by the hole digging is used to increase the length of the large end head, so that the flat cylindrical large end head 41 of the finished product 4 of the fourth mold is longer than the flat cylindrical large end head 31 of the finished product 3 of the third mold, and the diameter remains the same. For the fourth mold, similar to the third mold, the finished product 3 of the third mold is all cold extruded in the main mold.

[0025] (6) Translate the finished product 4 of the fourth mold to the opening of the fifth mold. Through cold heading manufacturing in the fifth mold, extend and heading the central blind hole 52 of the finished product of the fifth mold based on the central blind hole 42 of the finished product 4 of the fourth mold. The metal transfer amount generated by extending the central blind hole 42 in the beam rod section 11 is specifically used to extend the beam rod section 11 to the length of the cylindrical main body rod 61, and at the same time, the diameter is also the length of the cylindrical main body rod 61. The length of the central hole section therein is also shaped and will not be changed in the next process. For the fifth mold, its die surface line is located in the middle of the flat cylindrical large end head 41 of the finished product 4 of the fourth mold.

[0026] (7) Translate the finished product of the fifth mold to the opening of the sixth mold. For the sixth mold, its die surface line is located at the rear end face of the large end head 51 of the finished product of the fifth mold. The sixth mold is provided with a mandrel 203 matching the diameter of the central blind hole 63. The reference numeral 201 in the attached drawing is the main mold, the reference numeral 202 is the front mold punch, and the reference numeral 204 is the ejector rod. During cold extrusion, on the basis of inserting the mandrel 201 into the central blind hole 52 of the finished product of the fifth mold (the insertion depth enters at least into the front mold) to protect the hole and support from the hole wall direction, and with the ejector rod 204 padded at the rear end, cold extrude the large end head 51 of the finished product of the fifth mold to form the flat cylindrical main body 621 and the rear end circular flange 622 protruding laterally at the rear end of the flat cylindrical main body, and form the flange head. The appearance quality and mechanical properties of the flange head are better, and the T-shaped sleeve nut 100 for fixing the automobile chassis is manufactured.

[0027] The above are only specific embodiments 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 a T-shaped sleeve nut for fixing an automobile chassis, characterized in that The external structure of the T-shaped sleeve nut for fixing the vehicle chassis includes a cylindrical main body rod. At the front end of the cylindrical main body rod is a flange head, which includes a flat cylindrical main body and a rear circular flange piece protruding laterally at the rear end of the flat cylindrical main body. The diameter of the flat cylindrical main body is 75-85% of the diameter of the circular flange piece, and the diameter of the cylindrical main body rod is 37-50% of the diameter of the flat cylindrical main body. There is a central blind hole from the flange head to the inside of the cylindrical main body rod. The depth of the central blind hole is 78-90% of the total length of the T-shaped sleeve nut for fixing the vehicle chassis. The diameter of the central blind hole is 45-55% of the diameter of the cylindrical main body rod, and the length of the central blind hole is 95-105% of the length of the cylindrical main body rod. The manufacturing method includes the following steps: (1) Feed the coil stock into a cold heading machine to automatically cut it into individual raw material parts of the T-shaped sleeve nut for fixing the vehicle chassis. The diameter of the coil stock is larger than the diameter of the cylindrical main body rod, and the length of the raw material part is longer than the length of the T-shaped sleeve nut. (2) Transfer the raw material part to the first die opening of the cold heading machine. After cold heading in the first die, the rear end of the finished product of the first die is rod-restrained. The length of the rod-restrained section is basically equal to the length of the non-rod-restrained front part. The rod section of the non-rod-restrained front part and the rod-restrained section are transitioned through a transition surface. The diameter of the rod-restrained section is the same as that of the cylindrical main body rod. (3) Translate the finished product of the first die to the second die opening. After cold heading in the second die, pre-upset the large end head of the non-rod-restrained rod section of the finished product of the first die, so that the pre-upset large end head forms a conical frustum. The diameter of the rear end of the conical frustum is larger than that of the non-rod-restrained rod section, and the diameter of the front end is smaller than the diameter of the flat cylindrical main body. And a convex arc is formed at the rear end. The die surface line of the second die is located at the rear end face of the conical frustum-shaped large end head. (4) Translate the finished product of the second die to the third die opening. In the third die, further upset and flatten the pre-upset large end head. The diameter after upsetting is the same as the diameter of the flat cylindrical main body, and the height after flattening is basically the same as the height of the flange head. And a central positioning hole is upset at the front end. For the third die, the finished product of the second die is all cold extruded in the main die. (5) Translate the finished product of the third die to the fourth die opening. After cold heading in the fourth die, pre-upset the central blind hole on the basis of the central positioning hole for the large end head of the finished product of the third die. The diameter of the central blind hole of the finished product of the fourth die is the same as the diameter of the central blind hole of the T-shaped sleeve nut. The central blind hole of the finished product of the fourth die does not exceed the large end head of the finished product of the fourth die, and the transferred metal amount is used to increase the length of the large end head, so that the large end head of the finished product of the fourth die is longer than the large end head of the finished product of the third die, and the diameter remains the same. For the fourth die, the finished product of the third die is all cold extruded in the main die. (6) Translate the finished product of the fourth die to the opening of the fifth die. Through cold heading manufacturing in the fifth die, extend the central blind hole of the finished product of the fourth die to upset the central blind hole of the finished product of the fifth die, forming the cylindrical main body rod and the central blind hole section therein. The metal transfer amount formed by upsetting the central blind hole section is used to extend the length of the bundled rod section to reach the length of the cylindrical main body rod. For the fifth die, its die surface line is located in the middle of the large end head of the finished product of the fourth die. (7) Translate the finished product of the fifth die to the opening of the sixth die. For the sixth die, its die surface line is located at the rear end face of the large end head of the finished product of the fifth die. The sixth die is provided with a mandrel and a rear ejector rod that match the diameter of the central blind hole. The mandrel is inserted at least into the main die, and the ejector rod is placed at the rear end of the finished product of the fifth die. Cold extrude the large end head of the finished product of the fifth die on the basis of the mandrel hole protection to form the flat cylindrical main body and the rear circular flange that protrudes laterally at the rear end of the flat cylindrical main body, forming the flange head, and manufacturing the T-shaped sleeve nut for fixing the vehicle chassis.

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