Friction spot joint structure

a friction spot and joint technology, applied in non-electric welding apparatus, manufacturing tools, welding/soldering/cutting articles, etc., can solve the problems of difficult adjustment, large time period, and unsuitable light metals such as aluminum and the like for fused joints such as arc welding, so as to achieve constant target joint strength and increase shear fracture strength. , the effect of easy adjustmen

Inactive Publication Date: 2005-08-18
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0035] In the friction spot joint structure according to the above embodiment, the concave portion 61 is formed by the pin portion 42, with the continuous interface S2 between the first plate member W1 and the second plate member W2 remained by pressing the first plate member W1 toward the second plate member W2 between the rotary tool 4 and the receiving member 5, and the annular bulging portion 63 of the second plate member W2 is formed which protrudes into the first plate member W1 by plastic flow of the first and second plate members W1, W2. The joint strength depends on the size of a mechanically joined part of the bulging portion 63, which can be easily adjusted by changing joining conditions such as the pressure and number of rotation of the rotary tool 4, ajoining period and the like. Accordingly, a target joint strength can be obtained constantly. Further, with the interface S2, the shear fracture strength is increased and easy quality manag...

Problems solved by technology

It has been known conventionally that light metals, particularly aluminum and the like are unsuitable for fused joint such as arc welding, compared with steels, because they are more conductive and transfer more heat than steels.
Howev...

Method used

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modified example of embodiment

[0038] The receiving member 5 is fixed in the above embodiment but may be movable in the rotation axis X. Further, the receiving member 5 is formed of the column shaped main body 51 having the top face 52 of which shape and area are substantially the same as or larger than those of the tip end portion 41 of the rotary tool 4 in the present invention, but the receiving member 5 may be in a plate shape.

working examples

[0039] Working Examples that were performed practically will be described next.

working example 1

[0040] Referring to the work W, a 6000 series aluminum alloy of 1 mm in thickness was used as the first plate member W1 and a 3000 series aluminum alloy of 1 mm in thickness was used as the second plate member W2. The work W was joined using the aforementioned friction point joining apparatus.

[0041] Specifically, the rotary tool 4 having the shoulder portion 43 of 8 mm in diameter was used, the pressure and number of rotation thereof were set to 3.42 kN and 2500 rpm, respectively, and a plurality of joint parts were formed in a single work W with the joining period changed per 0.1 sec. Then, the work W was cut into joint parts per joining period to observe each section thereof Further, the tensile shear strength of each joint part per joining period was measured.

[0042]FIG. 3 shows studied results of dependencies of diameters R of fractured parts and tensile shear strength on the joining period. FIG. 4 is a section showing the joint part obtained at the joining period of 0.4 sec., ...

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Abstract

In a friction spot joint structure, a first plate member is pressed against a second plate member by using a rotary tool and a receiving member. A concave portion is formed by a rotating pin portion of the rotating tool, with an interface between the first plate member and the second plate member remained. In this time, the first and second plate members are allowed to plastic-flow, so that an annular bulging portion of the second plate member raised into the first plate member is formed around the concave portion.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This Non-provisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No. 2004-037708 filed in Japan on Feb. 16, 2004, the entire contents of which are hereby incorporated by reference. BACKGROUND ART [0002] 1. Field of the Invention [0003] The present invention relates to a friction spot joint structure in which a plurality of plate members are overlapped and joined by plastic-flowing the plate members. [0004] 2. Description of the Prior Art [0005] It has been known conventionally that light metals, particularly aluminum and the like are unsuitable for fused joint such as arc welding, compared with steels, because they are more conductive and transfer more heat than steels. [0006] Taking the above into consideration, friction spot joint structure has been known in which plate members are point joined by fusing a part thereof by friction, for example, as disclosed in Japanese Patent Application Laid Open Public...

Claims

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Application Information

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IPC IPC(8): B23K20/12B23K103/10
CPCB23K20/1265D04H1/4291D04H1/4382D04H13/00D06C7/00D06C15/00
Inventor TAKASE, KENJIIWASHITA, TOMOYUKIKATO, KIKUOGENDOU, TOSHIYUKI
Owner MAZDA MOTOR CORP
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