Bushing for installing cold extrusion joint

Abstract

A lining for installing a cold extrusion joint can provide high interference amount to enable the cold extrusion joint to generate plastic deformation, has a sealing effect and certain push-torsion resistance while being tightly combined with a structural frame plate, and protects an inner hole of the cold extrusion joint from being influenced by friction force generated by high interference of an extrusion core rod. The method can be suitable for cold extrusion joints made of aluminum alloy, stainless steel, titanium alloy, composite materials and the like, it is guaranteed that the cold extrusion joints can be installed from the single side, the installation requirement space of the cold extrusion joints is reduced, and the application range of the cold extrusion joints is widened.

Description

Technical Field

[0001] The utility model relates to the technical field of cold extrusion, in particular to a bushing for installing a cold extrusion joint. Background Art

[0002] Cold extruded joints are pipe connectors that can be used in fuel systems, hydraulic systems, electrical systems, drainage systems, etc. The current application installation location is mainly to replace the traditional through-wall connection method of welding or flange connection. When installing the current cold extruded joints, because the cold extruded joints need to be installed at both ends, the installation space required is large, and some small spaces are difficult to install, which limits its scope of use. Utility Model Content

[0003] The utility model aims to provide a bushing for installing a cold extruded joint, so as to ensure that the cold extruded joint can be installed from a single side, reduce the space required for installing the cold extruded joint, and increase the application range of the cold extruded joint.

[0004] In order to achieve the purpose of the utility model, the technical solution adopted is: a bushing for installing a cold extruded joint, the bushing is made of stainless steel strip and has a certain elasticity as a whole. The bushing includes a front end bushing and a rear end flange, and is made of a stainless steel strip that is rolled into an incompletely closed circular tube and flanged at the rear end. After the core rod is inserted into the front end bushing, there is a small width gap in the circumferential direction of the bushing, and there is an overlap at the slit position in the free state. The inner diameter hole wall of the bushing is coated with a solid dry film lubricant to reduce the tension required during the extrusion installation of the cold extruded joint. A high interference amount is provided by the bushing wall thickness and the main diameter of the core rod, so that the cold extruded joint is combined with the structural frame plate after elastic-plastic deformation, and it is ensured that the cold extruded joint can be installed from a single side, reducing the space required for the installation of the cold extruded joint and increasing the scope of application of the cold extruded joint.

[0005] The advantages of the utility model are:

[0006] 1. The bushing has the advantages of high efficiency and large extrusion volume;

[0007] 2. The bushing can be applied to cold extrusion joints of aluminum alloy, stainless steel, titanium alloy and composite materials;

[0008] 3. The bushing can be used for extrusion installation of cold extrusion joints with diameters ranging from Φ3mm to Φ70mm;

[0009] 4. Simple installation process;

[0010] 5. The bushing has a slit in the axial direction, which makes it easier to install the bushing on the mandrel and simplifies the operation process;

[0011] 6. After the bushing is extruded, the inner wall surface of the cold extruded joint can be smoother, reducing stress concentration areas and micro-crack sources;

[0012] 8. The lubricating coating on the inner surface can reduce the tensile force during the extrusion process of the special tool, ensure the correct radial expansion of the cold extruded joint, and prevent damage to the cold extruded joint;

[0013] 9. It can ensure that the cold extrusion joint can be installed from one side, reducing the installation space required for the cold extrusion joint and increasing the application scope of the cold extrusion joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the specification are used to explain the principles of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0015] Figure 1 It is a schematic diagram of the bushing structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the bushing extrusion installation of the utility model.

[0017] Figure 3 This is the comparison of the cold extruded joint before and after the bushing is extruded. Figure 3 a is before extrusion, Figure 3 b is after extrusion.

[0018] In the figure: 1 bushing; 1.1 bushing body; 1.2 rear end flange; 1.3 gap;

[0019] 2 Extrusion core rod; 3 Cold extrusion joint; 3.1 Protrusion; 4 Structural frame plate; 5 Gap. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0021] Embodiment 1:

[0022] See also Figure 1 , cold extruded joint installation bushing, bushing 1 is made of stainless steel strip, and has a certain elasticity as a whole. Bushing 1 includes an incompletely closed tubular bushing body 1.1 and a rear end flange 1.2, bushing 1 is sleeved on the extrusion mandrel 2 (combined with Figure 2 ) when the outer periphery is formed, the bushing 1 has a small width gap 1.3 in the circumferential direction; there is an overlap at the slot position in the free state. The inner wall of the bushing body 1.1 is coated with a solid dry film lubricant to reduce the tension required during the extrusion installation of the cold extrusion joint.

[0023] Extrusion installation process Figure 2As shown, the lubricated bushing body 1.1 is sleeved on the outer periphery of the extrusion mandrel 2, and can fit tightly with the mandrel 2. The bushing 1 has a small width gap 1.3 in the axial direction, and can be placed in the cold extrusion joint 3 with the extrusion mandrel 2. When the bushing body 1.1 and the mandrel 2 are placed in the cold extrusion joint 3, use the installation tool to install it along the Figure 2 The taper mandrel 2 is pulled horizontally in the direction of the arrow shown, so that the bushing body 1.1 expands radially and the inner wall of the cold extrusion joint 3 is squeezed, so that the cold extrusion joint 3 is plastically deformed at the inward protrusion 3.1 corresponding to the structural frame plate 4, and the gap 5 between the cold extrusion joint 3 and the structural frame plate 4 is closed, and the two are tightly combined together (see Figure 3 ). After the bushing body 1.1 is extruded and installed, a small ridge will be formed at the gap 1.3 of the bushing body 1.1 corresponding to the original protrusion 3.1 of the cold extruded joint 3. The bushing can be applied to a variety of cold extruded joint materials, such as aluminum alloy, titanium alloy, low carbon steel and high strength steel, composite materials, etc.

[0024] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A bushing for cold extrusion joint installation, characterized in that: The bushing (1) is made of stainless steel strip and has elasticity; the bushing (1) includes an incompletely closed tubular bushing body (1.1) and a rear end flange (1.2); when the bushing (1) is sleeved on the outer periphery of an extruded core rod (2), a gap (1.3) is formed in the circumferential direction of the bushing (1), and the bushing (1) is placed together in a cold extrusion joint (3); the cold extrusion joint (3) is plastically deformed at a protrusion (3.1) inwardly pointing to a structural frame plate (4), and the protrusion (3.1) fills the gap (5).

2. The cold extruded joint installation bushing according to claim 1, characterized in that: The inner wall of the bushing body (1.1) is coated with a solid dry film lubricant to reduce the pulling force required during the extrusion installation of the cold extruded joint.

3. The cold extruded joint installation bushing according to claim 1, characterized in that: The bushing (1) is suitable for cold extrusion joints of aluminum alloys, titanium alloys, low-carbon steel and high-strength steel, and composite materials.

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