Tool for welding nut on middle cross beam assembly of rear floor of automobile

Abstract

The utility model relates to a tool for welding a nut on an automobile rear floor middle cross beam assembly, which comprises an upper tool, a conductive ball head electrode piece and a lower tool, and the upper tool and the lower tool are respectively and electrically connected with an upper electrode and a lower electrode; a groove is formed in the bottom of the upper tool, the top of the conductive ball head electrode piece is embedded in the groove, the conductive ball head electrode piece is composed of an upper part and a lower part, the bottom of the upper part is provided with a spherical concave face, the top of the lower part is provided with a spherical convex face, the bottom of the lower part is in threaded connection with an electrode tip, and a nut receding hole is formed in the bottom of the electrode tip. An air pipe connector used for being connected with an air source is arranged on the lower part, a vent hole communicated with the air pipe connector is formed in the lower part, and the vent hole is communicated with the nut receding hole. According to the utility model, the sealing nut is internally coated with the sealant and is convexly welded on the rear floor middle cross beam assembly, so that the sealing function requirement after the nut is welded is met.

Description

Technical Field

[0001] The utility model belongs to the field of automobile parts processing, and in particular relates to a tool for welding nuts on a crossbeam assembly in a rear floor of an automobile. Background Art

[0002] The sealing nut is welded on the rear floor middle crossbeam assembly. Because the sealing nut has good sealing performance, it needs to be positioned and welded on a special projection welding tool. The sealing performance after welding must be qualified. The flatness of the upper and lower tooling electrodes is very high. During the welding process, the local unevenness of the electrodes will affect the fusion of the nut flange, resulting in reduced sealing performance. Summary of the invention

[0003] The utility model aims to provide a tool for welding nuts on a middle crossbeam assembly of a rear floor of an automobile, which can convexly weld sealing nuts on the middle crossbeam assembly of the rear floor, thereby achieving the sealing function requirement after the nuts are welded.

[0004] The technical solution provided by the utility model is: a tooling for welding nuts on a cross beam assembly in a rear floor of an automobile, comprising an upper tooling, a conductive ball head electrode component and a lower tooling, wherein the upper tooling and the lower tooling are electrically connected to an upper electrode and a lower electrode respectively; a groove is provided at the bottom of the upper tooling, the top of the conductive ball head electrode component is embedded in the groove, the conductive ball head electrode component is composed of an upper component and a lower component, the bottom of the upper component has a spherical concave surface, the top of the lower component has a spherical convex surface, the spherical convex surface at the top of the lower component is fitted with the spherical concave surface at the bottom of the upper component, the upper component and the lower component are connected by bolts, the bottom of the lower component is threadedly connected with an electrode head, the bottom of the electrode head is provided with a nut yield hole, the lower component is provided with an air pipe joint for connecting to an air source, the lower component is provided with an air vent connected to the air pipe joint, and the air vent is connected to the nut hole.

[0005] The utility model adopts the above structure, after applying a circle of conductive sealant inside the flange of the sealing nut, the nut is then inserted into the nut clearance hole (in the positioning pin) at the bottom of the electrode head for welding; the middle crossbeam assembly of the rear floor of the automobile is placed on the lower tooling, the upper tooling is pressed down, the sealing nut is automatically aligned and flattened by the ball head, the tooling is powered on for welding, and the air pipe joint is connected to the air source for ventilation to blow away the spatter in welding. During the welding process, the nut conducts electricity to generate high temperature, the conductive sealant solidifies under the high temperature, and a circle of sealing layer is formed on the inner surface of the flange, meeting the sealing function requirements of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of the utility model. Implementation

[0007] See also Figure 1The utility model includes an upper tooling 5, a conductive ball head electrode member 3 and a lower tooling 10, wherein the upper tooling 5 and the lower tooling 10 are electrically connected to the upper electrode and the lower electrode respectively; a groove is provided at the bottom of the upper tooling 5, and the top of the conductive ball head electrode member 3 is embedded in the groove and connected to the upper tooling 5 by bolts 9. The conductive ball head electrode member 3 is composed of an upper member 6 and a lower member 8. The upper member 6 has a spherical concave surface at the bottom, and the lower member 8 has a spherical convex surface at the top. The spherical convex surface at the top of the lower member 8 fits with the spherical concave surface at the bottom of the upper member 6. The upper member 6 and the lower member 8 are connected by bolts 7 (the bolts are tightened when they are screwed to the bare thread position, and the bolt bare thread is designed with a 3MM open gap to ensure that the upper and lower ball heads are tightly fitted when they are under pressure, and there is a 3MM gap when they are separated under the action of their own weight). The bottom of the lower member 8 is threadedly connected with an electrode head 1, and a nut clearance hole 4 is provided at the bottom of the electrode head 1 to make way for the nut head end (without damaging the nut port and the internal thread during welding), so that electricity can be supplied to the nut flange surface (closer than the nut port for electrification, and the electrification current on the welding boss is more concentrated). The lower member 8 is provided with an air pipe joint 2 for connecting to an air source, and a vent hole 11 connected to the air pipe joint 2 is provided in the lower member 8, and the vent hole 11 is connected to the nut hole 4. The lower tooling is a conventional supporting member that can support the crossbeam assembly in the rear floor of the automobile.

[0008] The electrode head 1 of the utility model is tightened and installed on the conductive ball head electrode part 3. After a circle of conductive sealant is applied inside the flange of the sealing nut, the nut is inserted into the nut clearance hole 4. When the nut is pressed down, the ball head is used to automatically align and flatten the sealing nut for welding; the air pipe joint 2 is connected to the air source, and the air is ventilated to blow away the splashes in the welding. During the welding process, the nut conducts electricity to generate high temperature, and the conductive sealant solidifies under the high temperature, forming a circle of sealing layer on the inner surface of the flange, meeting the sealing function requirements of the product.

Claims

1. A tool for welding nuts on a crossbeam assembly in a rear floor of an automobile, characterized in that: It includes an upper tooling, a conductive ball head electrode member and a lower tooling, wherein the upper tooling and the lower tooling are electrically connected to the upper electrode and the lower electrode respectively; a groove is provided at the bottom of the upper tooling, and the top of the conductive ball head electrode member is embedded in the groove; The conductive ball head electrode component consists of an upper component and a lower component. The upper component has a spherical concave surface at the bottom, and the lower component has a spherical convex surface at the top. The spherical convex surface at the top of the lower component fits with the spherical concave surface at the bottom of the upper component. The upper component and the lower component are connected by bolts. The bottom of the lower component is threaded with an electrode head. A nut yield hole is provided at the bottom of the electrode head. The lower component is provided with an air pipe joint for connecting to an air source. A vent hole connected to the air pipe joint is provided in the lower component, and the vent hole is connected to the nut hole.

2. The tooling for welding nuts on the middle crossbeam assembly of the rear floor of an automobile according to claim 1, characterized in that: A conductive sealant injection tube is provided on the electrode head.

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