Cleaning of the inner core rod of an aluminum alloy rolled tube blank

Abstract

This utility model relates to a mandrel for cleaning the inner hole of aluminum alloy rolled tube blanks, belonging to the technical field of tools for hot extrusion and cold rolling of seamless tubes. It solves the problem that aluminum chips entering the inner hole of the tube blank easily press against the inner wall of the tube blank during the rolling process of seamless aluminum alloy tubes. It includes: a mandrel body, a rotary joint, and an oil pipe. One end of the mandrel body is connected to a mandrel via a connector, and the other end of the mandrel body is connected to the oil pipe via the rotary joint. A cavity is provided inside the mandrel body, and the cavity is connected to the rotary joint via the oil pipe. Multiple through holes are formed on the side wall of the mandrel body, all of which communicate with the cavity. This utility model is used for rolling seamless tubes and has the function of cleaning the inner wall of the tube blank.

Description

Technical Field

[0001] This utility model relates to the technical field of hot extrusion and cold rolling processing tools for seamless tubes, and in particular to a core rod for cleaning the inner hole of an aluminum alloy rolled tube blank. Background Technology

[0002] In the rolling process of seamless aluminum alloy tubes, mandrels and core rods are typically used, and the two are detachably connected by connectors. The diameter of the mandrel is smaller than that of the core rod to facilitate the introduction of the tube blank; the core rod, on the other hand, supports the tube wall and works in conjunction with the rolls to complete the rolling deformation of the tube.

[0003] However, in actual continuous production, when one tube blank is rolled and a subsequent tube blank is rolled, the ends of the two tube blanks will experience severe friction during the rotational rolling process, generating a large amount of fine aluminum shavings. These aluminum shavings easily enter the inner hole of the tube blank, and as the rolling process continues, the attached aluminum shavings will be further pressed onto the inner wall of the tube blank, making it difficult to detach naturally. During subsequent aluminum shavings processing, their removal will cause varying degrees of indentation on the inner wall of the tube, directly affecting the quality of the rolled tube's inner hole. This can not only result in a large number of defective products but also increase production costs and reduce production efficiency. Utility Model Content

[0004] In view of the problem that aluminum chips entering the inner hole of the tube blank are easily pressed together with the inner wall of the tube blank during the rolling process of the above-mentioned seamless aluminum alloy tube, the purpose of this utility model is to provide a core rod for cleaning the inner hole of the rolled aluminum alloy tube blank.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A mandrel for cleaning the inner hole of an aluminum alloy rolled tube blank includes: a mandrel body 3, a rotary joint 4, and an oil pipe 5. One end of the mandrel body 3 is connected to a mandrel 1 via a connector 2, and the other end of the mandrel body 3 is connected to the oil pipe 5 via the rotary joint 4. A cavity 6 is provided inside the mandrel body 3, and the cavity 6 is connected to the rotary joint 4 via the oil pipe 5. Multiple through holes 7 are provided on the side wall of the mandrel body 3, and all the multiple through holes 7 are connected to the cavity 6.

[0007] Furthermore, the core rod body 3 includes a solid section 31 and a hollow section 32, the solid section 31 and the hollow section 32 are connected as one piece; the cavity 6 is disposed on the hollow section 32; the solid section 31 is provided with a first threaded part 311, the first threaded part 311 is threadedly connected to the connector 2.

[0008] Furthermore, the length of the solid section 31 in the axial direction is 200mm.

[0009] Furthermore, a ball valve 8 is installed on the oil pipe 5.

[0010] Furthermore, six through holes 7 are provided on the side wall of the core rod body 3, and the six through holes 7 are spirally distributed along the axial direction of the core rod body 3.

[0011] Furthermore, the diameter of through hole 7 is 6mm.

[0012] Furthermore, the other end of the core rod body 3 is provided with a second threaded part 33, which is threadedly connected to the rotary joint 4.

[0013] Furthermore, the oil pipe 5 is a flexible pipe.

[0014] Because this utility model employs the aforementioned technology, it has the following positive effects compared to existing technologies:

[0015] (1) Compared with the traditional solid mandrel, this utility model adds a cleaning function. This utility model includes a mandrel body, a rotary joint and an oil pipe. A cavity is provided inside the mandrel body, and the cavity is connected to the oil pipe through the rotary joint. Multiple through holes communicating with the cavity are opened on the side wall of the mandrel body. The oil pipe is used to transmit oil into the cavity. The oil flushes the inner wall of the tube blank through the through holes, which can promptly remove the fine aluminum chips that enter the inner hole of the tube blank during the rolling process, and prevent the aluminum chips from being pressed into the inner wall of the tube blank. It solves the problem that aluminum chips falling off easily causes pits on the inner wall, effectively reduces the quality defects of the inner hole of the tube, and significantly reduces the rate of defective products. Due to the reduction in the rate of defective products, the waste of raw materials and the additional costs caused by rework and scrap are reduced. In addition, there is no need to carry out complicated treatment for aluminum chip residue in subsequent processes, which simplifies the production process, shortens the production cycle and improves the overall continuous production efficiency.

[0016] (2) The structure of this utility model is simple and practical, and can be matched and connected with existing mandrels, making it easy to promote and apply in the existing production system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a core rod for cleaning the inner hole of an aluminum alloy rolled tube blank according to this utility model.

[0018] In the attached diagram: 1. Mandrel; 2. Connector; 3. Mandrel body; 31. Solid section; 311. First threaded section; 32. Hollow section; 33. Second threaded section; 4. Rotary joint; 5. Oil pipe; 6. Cavity; 7. Through hole; 8. Ball valve. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0020] Please refer to Figure 1The diagram illustrates a mandrel for cleaning the inner bore of an aluminum alloy rolled tube blank. It includes a mandrel body 3, a rotary joint 4, and an oil pipe 5. One end of the mandrel body 3 is connected to a mandrel 1 via a connector 2, and the other end is connected to the oil pipe 5 via the rotary joint 4. The end of the oil pipe 5 furthest from the rotary joint 4 is connected to an oil pump, which is connected to an oil tank. The mandrel body 3 has a cylindrical structure. A cavity 6 is provided inside the mandrel body 3, and the cavity 6 is connected to the rotary joint 4 via the oil pipe 5. Multiple through holes 7 are formed on the side wall of the mandrel body 3, all of which are connected to the cavity 6. The oil pump delivers rolling oil into the oil pipe 5. The rolling oil enters the cavity 6 through the rotary joint 4 and is sprayed out through the through holes 7. The sprayed rolling oil cleans the inner wall of the tube blank, and the cleaned scum flows out from the tail end of the tube blank.

[0021] Furthermore, in a preferred embodiment, the core rod body 3 includes a solid section 31 and a hollow section 32, which are connected as a single unit; a cavity 6 is disposed on the hollow section 32; a first threaded portion 311 is provided on the solid section 31, which is threadedly connected to the connector 2; the connector 2 is made of solid tool steel, and each end of the connector 2 is provided with a threaded hole, one threaded hole being connected to the first threaded portion 311, and the other threaded hole being connected to the core rod 1; the core rod body 3 must be strong enough to resist tensile stress; the core rod body 3 is made of steel.

[0022] Furthermore, in a preferred embodiment, the length of the solid segment 31 in the axial direction is 200 mm. The purpose of setting a certain length for the solid segment 31 is to facilitate the machining of the first threaded portion 311. This length selection not only provides sufficient machining space to facilitate the machining of the first threaded portion 311 using conventional equipment such as lathes, but also ensures the load-bearing strength of the connection of the first threaded portion 311.

[0023] Furthermore, in a preferred embodiment, a ball valve 8 is provided on the oil pipe 5. The ball valve 8 is used to control the flow rate of the rolling oil, so as to adjust the corresponding oil supply flow rate according to the different aluminum shaving residue levels in the inner hole of the billet, ensuring the cleaning effect while avoiding waste of rolling oil; furthermore, the ball valve 8 is a manual ball valve switch.

[0024] Furthermore, in a preferred embodiment, six through holes 7 are provided on the side wall of the core rod body 3. The six through holes 7 are spirally distributed along the axial direction of the core rod body 3. The spiral distribution causes the through holes 7 to be misaligned in both the axial and circumferential directions, thereby improving the uniformity of rinsing.

[0025] Furthermore, in a preferred embodiment, six through holes 7 are distributed in a region 2300-600mm away from the connector; the axial length of the core rod body 3 can be equal to the length of the solid core rod in the prior art, typically designed to be 12 meters; the six through holes 7 are located near one end of the core rod 1. The design purpose of distributing the six through holes 7 in a region 2300-600mm away from the connector is twofold: first, it avoids the stress concentration area near the connector 2 caused by assembly stress, preventing weakening of the connection strength between the core rod body 3 and the connector 2 after drilling; second, since the rolling oil after rinsing flows out from the tail end of the tube, this design ensures more comprehensive rinsing of the tube fitted on the core rod body 3.

[0026] Furthermore, in a preferred embodiment, the angle between two adjacent through holes 7 along the circumference of the core rod body 3 is 120°.

[0027] Furthermore, in a preferred embodiment, the diameter of the through hole 7 is 6 mm.

[0028] Furthermore, in a preferred embodiment, the other end of the mandrel body 3 is provided with a second threaded portion 33, which is threadedly connected to the rotary joint 4. During the rolling process, the mandrel body 3 rotates with the billet, and the rotary joint 4 can achieve a dynamic sealing connection between the mandrel body 3 and the oil pipe 5, ensuring that the rolling oil flows stably into the cavity 6 without leakage.

[0029] Furthermore, in a preferred embodiment, the oil pipe 5 is a flexible pipe; the oil pipe 5 can be made of oil-resistant rubber or PU pipe, and its flexibility can be adapted to the spatial layout of the rolling production line. It can flexibly connect the rotary joint 4 and the oil pump, and avoid damage to the oil pipe 5 due to slight vibration or displacement of the core rod body 3, thereby improving the safety and durability of the equipment operation; the oil pipe 5 and the rotary joint 4 are connected by a quick connector, with a female end on the rotary joint 4 and a male end on the oil pipe 5.

[0030] Working principle:

[0031] One end of the mandrel body 3 is connected to the mandrel 1 via connector 2, and the other end of the mandrel body 3 is connected to rotary joint 4. The tube blank is then fitted onto the mandrel body 3 and mandrel 1 through the rotary joint 4, and then the oil pipe 5 is connected to the rotary joint 4. During rolling, the oil pump is turned on, and the flow rate is controlled by ball valve 8. The oil pump delivers rolling oil into the oil pipe 5, and the rolling oil enters the cavity 6 through the rotary joint 4 and is sprayed out through the through hole 7. The sprayed rolling oil cleans the inner wall of the tube blank, and the cleaned slag flows out from the tail end of the tube blank. During the rolling process, the sprayed rolling oil continuously washes the inner wall of the tube blank, promptly dispersing and carrying away the generated aluminum shavings, and the slag flows out from the tail end of the tube blank.

[0032] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A core rod for cleaning the inner hole of an aluminum alloy rolled tube blank, characterized in that: It includes a core rod body (3), a rotary joint (4) and an oil pipe (5). One end of the core rod body (3) is connected to the core rod (1) through a connector (2), and the other end of the core rod body (3) is connected to the oil pipe (5) through a rotary joint (4). A cavity (6) is provided inside the core rod body (3), and the cavity (6) is connected to the rotary joint (4) through the oil pipe (5). Multiple through holes (7) are provided on the side wall of the core rod body (3), and the multiple through holes (7) are all connected to the cavity (6).

2. The core rod for cleaning the inner hole of an aluminum alloy rolled tube blank according to claim 1, characterized in that: The core rod body (3) includes a solid section (31) and a hollow section (32), the solid section (31) and the hollow section (32) are connected as one unit; the cavity (6) is provided on the hollow section (32); the solid section (31) is provided with a first threaded part (311), the first threaded part (311) is threadedly connected to the connector (2).

3. The core rod for cleaning the inner hole of an aluminum alloy rolled tube blank according to claim 2, characterized in that: The length of the solid section (31) in the axial direction is 200mm.

4. The core rod for cleaning the inner hole of an aluminum alloy rolled tube blank according to claim 1, characterized in that: A ball valve (8) is installed on the oil pipe (5).

5. A core rod for cleaning the inner hole of an aluminum alloy rolled tube blank according to claim 1, characterized in that: The core rod body (3) has six through holes (7) on its side wall, and the six through holes (7) are spirally distributed along the axial direction of the core rod body (3).

6. A core rod for cleaning the inner hole of an aluminum alloy rolled tube blank according to claim 1, characterized in that: The diameter of the through hole (7) is 6 mm.

7. A core rod for cleaning the inner hole of an aluminum alloy rolled tube blank according to claim 1, characterized in that: The other end of the core rod body (3) is provided with a second threaded part (33), which is threadedly connected to the rotary joint (4).

8. A core rod for cleaning the inner hole of an aluminum alloy rolled tube blank according to claim 1, characterized in that: The oil pipe (5) is a flexible pipe.

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