Semi-hollow self-punching riveting screw with fastening thread and self-punching riveting equipment and method

A self-piercing riveting and thread tightening technology, applied in the directions of screws, rivets, mechanical equipment, etc., can solve the problems of rivet fracture failure, high cost, inapplicability, etc., to improve the material forming performance, simple structure, easy to process and manufacture Effect

Pending Publication Date: 2018-08-28
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Thin metal and non-metal sheets are widely used in the machinery industry and the automobile industry. Self-piercing riveting technology is a new type of thin sheet connection technology that replaces traditional resistance spot welding. It does not require pre-punching like traditional riveting technology. The process is simple, and the semi-hollow self-piercing rivet and the light alloy plate are plastically deformed together to form a mechanical inner lock and realize a firm mechanical connection; it is especially suitable for the tightness of 2-6mm light alloy and composite material plates that are difficult to weld. However, due to the limitation of the rive

Method used

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  • Semi-hollow self-punching riveting screw with fastening thread and self-punching riveting equipment and method
  • Semi-hollow self-punching riveting screw with fastening thread and self-punching riveting equipment and method
  • Semi-hollow self-punching riveting screw with fastening thread and self-punching riveting equipment and method

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Example Embodiment

[0039] Example 1

[0040] Such as image 3 As shown, the upper sheet 4 used in this embodiment is a layer of 2mm thick 6061-T6 aluminum alloy, and the lower sheet 5 is a layer of 3mm thick Q235 low carbon steel and a layer of 4mm thick carbon fiber sheet. The total thickness of the sheet is 9mm. The yield strength of 6061-T6 aluminum alloy is 200-230Mpa, the tensile strength is 340-380Mpa, the yield strength of Q235 steel is 230-240Mpa, and the tensile strength is 370-500Mpa.

[0041] 6061-T6 aluminum alloy and Q235 low carbon steel can achieve better self-piercing riveting forming at room temperature. Q235 with better plasticity is placed in the middle as the lower plate 5, and 6061-T6 aluminum alloy is placed in the upper layer, which is realized after positioning and clamping. For riveting, the carbon fiber sheet is not suitable for riveting due to its poor plasticity. Therefore, it is used as the uppermost sheet after pre-punching. After the riveting is completed, the threaded...

Example Embodiment

[0042] Example 2

[0043] Such as image 3 As shown, the upper plate 4 and the lower plate 5 used in this embodiment are both 2mm thick 7075-T6 high-strength aluminum alloy, and a layer of 6mm thick high-strength steel plate, the total thickness of the plate is 10mm, of which 7075-T6 aluminum alloy The yield strength is 480-520Mpa, and the tensile strength is 630-670Mpa; the yield strength of high-strength steel plate is 800-900Mpa, and the tensile strength is 1200-1300Mpa.

[0044] 7075-T6 aluminum alloy cannot be riveted and formed at room temperature, so heat treatment is performed first to improve the formability of the material.

[0045] First, the double-layer 7075-T6 aluminum alloy sheet to be riveted is heated and solution treated, the solution temperature is 470-480℃, and the holding time is 25-35min. 7075 aluminum alloy has better formability at about 400℃, so solution treatment After the completion, when the 7075 aluminum alloy is cooled to 380-410°C, the self-piercing r...

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Abstract

The invention provides a semi-hollow self-punching riveting screw with a fastening thread. The screw is characterized by comprising a rivet body with a semi-hollow structure, and a thread head which is arranged on the upper end face of the rivet body and provided with the fastening thread. The bottom of the thread head is provided with a cutter withdrawal groove facilitating cutter withdrawal after thread machining is finished. The outer diameter of the rivet body is the same as that of the thread head. The invention further discloses self-punching riveting equipment method adopting the riveting screw. An improved self-punching riveting rod pushes the semi-hollow self-punching riveting screw to achieve riveting and forming of thin plates, and then mechanical connection between thicker plates is achieved by means of a thread mechanism. The screw is simple in structure form, machining and manufacturing are facilitated, the cost is low, the limitation to a traditional semi-hollow self-punching riveting screw from the thickness of riveted plates is overcome, and mechanical connection between three-layer or multi-layer thicker plates can be achieved.

Description

technical field [0001] The invention belongs to the field of connecting metal and non-metal plates, and in particular relates to a semi-hollow self-piercing riveting screw with fastening threads and self-piercing riveting equipment and method, especially suitable for the same type and different type with high strength and thickness Mechanical connection of metallic materials and most non-metallic materials. Background technique [0002] Thin metal and non-metal sheets are widely used in the machinery industry and the automobile industry. Self-piercing riveting technology is a new type of thin sheet connection technology that replaces traditional resistance spot welding. It does not require pre-punching like traditional riveting technology. The process is simple, and the semi-hollow self-piercing rivet and the light alloy plate are plastically deformed together to form a mechanical inner lock and realize a firm mechanical connection; it is especially suitable for the tightnes...

Claims

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Application Information

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IPC IPC(8): F16B19/10F16B5/04F16B5/02F16B35/04B21J15/02B21J15/10B29C65/60B29L7/00B29L9/00
CPCF16B5/02F16B5/045F16B19/10F16B35/04B21J15/025B21J15/10B29C65/601B29C66/41B29L2007/002B29L2009/00
Inventor 盈亮代景超戴明华胡平韩小强
Owner DALIAN UNIV OF TECH
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