Paint removing tool and method for bonding hole of automobile frame

Abstract

The invention relates to an automobile frame bonding hole paint removing tool and method. The automobile frame bonding hole paint removing tool comprises a drill bit. The drill bit comprises a drill handle, a cutting edge and a guide column. A guide post is arranged at the other end of the cutting edge; the guide post adopts a step cylinder structure and is divided into two sections; according to the method, paint removal of the electrophoresis vehicle frame bond holes is achieved, the requirement that the resistance value between vehicle frame bond bolts is smaller than or equal to 1 m omega is met, the size precision of existing manual grinding wheel polishing paint removal faces is improved to be within 1 mm, the machining time of a single paint removal face is shortened to 10 s from 30 s, and the paint make-up technology is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobiles, and in particular to a paint removal tool and method for a bonding hole of an automobile frame. Background Art

[0002] As the frame painting process changes from overall electrophoresis to scattered parts electrophoresis, the overall electrophoresis grounding hole paint removal process method is no longer suitable for the current scattered parts electrophoresis grounding hole paint removal requirements. At present, commercial vehicle frame scattered parts electrophoresis usually uses two methods to remove paint to achieve frame grounding conductivity reliability; the first method uses grounding bolts to assemble serrated gaskets, but there are the following problems: serrated gaskets will increase resistance after the bolts are loose, increasing the risk of circuit fire; the second method is to use a shutter wheel to grind the paint around the grounding holes on the ventral surface of the frame, and then assemble the process bolts and nuts for repainting. This method results in a large and irregular paint removal range and must be repainted, with low processing efficiency, dust pollution in the production workshop, and is not conducive to the automated production of frame riveting lines. At the same time, some frames need to be depainted on site at the vehicle assembly line, and the paint removal process of frame riveting lines is not suitable for the vehicle assembly environment. Summary of the invention

[0003] The purpose of the present invention is to provide a paint removal tool and method for the bonding holes of an automobile frame in view of the deficiencies in the prior art.

[0004] The present invention is achieved by adopting the following technical solutions: A paint removal tool for a bonding hole of an automobile frame comprises a drill bit; the drill bit comprises a drill shank, a cutting edge and a guide column; the drill shank is arranged at one end of the cutting edge, and the guide column is arranged at the other end; the guide column adopts a stepped cylindrical structure and is divided into two sections.

[0005] As a further description of the invention, the drill bit is made of W6Mo5Cr4V2 with a quenching hardness of HRC61-63.

[0006] As a further illustration of the invention, the outer circle dimension tolerance of the cutting edge is controlled within 0 to 0.1 mm.

[0007] As a further explanation of the invention, the outer circle size tolerance of the first section of the guide column is controlled within -0.1 to 0 mm, and the center of the paint surface is controlled to be concentric with the center of the grounding hole of the first layer of the frame by ≤1 mm; The outer circle size tolerance of the second section of the guide column is controlled within 0-0.1mm, and the center of the paint surface is controlled to be concentric with the center of the grounding hole of the second layer of the frame within 1mm.

[0008] As a further illustration of the invention, the end of the drill shank is a hexagonal structure.

[0009] A method for removing paint from a bonding hole of an automobile frame, comprising: S1: Assemble the drill handle of the drill bit to the rechargeable electric drill, adjust the speed to 1700r / min, and ensure that the paint removal time on one side of the frame grounding hole is ≤10s; S2: Insert the guide column of the drill into the bonding hole of the frame, hold the rechargeable electric drill and keep the cutting edge of the drill close to the paint-removed surface of the bonding hole of the frame, and remove the paint from the bonding hole of the frame; S3: Use a box ruler to check the dimensions of the frame grounding holes without paint, and install the grounding bolts; S4: Measure the resistance between the two grounding bolts to ensure that the resistance between the grounding bolts is ≤1mΩ; S5: Apply anti-rust wax around the contact surface between the grounding bolt and the unpainted surface of the frame grounding hole.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention realizes paint removal of the grounding holes of a loose-part electrophoresis vehicle frame, ensures the requirement that the resistance value between the grounding bolts of the vehicle frame is ≤1mΩ, improves the dimensional accuracy of the existing manual grinding wheel paint removal surface to within 1mm, reduces the processing time of a single paint removal surface from 30s to 10s, and reduces the paint touch-up process. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the drill bit structure of the present invention; Figure 2 is a side view of the drill bit structure of the present invention; Figure 3 yes Figure 2 A partial enlarged view of BB.

[0012] In the figure, 1. guide column; 2. cutting edge; 3. drill shank. DETAILED DESCRIPTION

[0013] like Figure 1-3 As shown, a paint removal tool for the bonding holes of an automobile frame includes a drill bit; the drill bit includes a drill shank 3, a cutting edge 2 and a guide column 1; the drill shank 3 is provided at one end of the cutting edge 2, and the guide column 1 is provided at the other end; the guide column 1 adopts a stepped cylindrical structure and is divided into two sections.

[0014] The drill bit is made of W6Mo5Cr4V2 (high-speed tool steel) with a quenching hardness of HRC61-63, ensuring paint removal efficiency and durability, and a smooth paint removal surface.

[0015] The outer circle size tolerance of the cutting edge 2 is controlled within 0 to 0.1 mm. In this embodiment, the outer circle of the cutting edge 2 is φ28 mm, the size tolerance is controlled within 0 to 0.1 mm, the taper a of the cutting edge 2 is 30°, the taper b is 90°, the taper c is 8°, the taper d is 30°, the taper e is 8°, and the taper f is 20°.

[0016] In order to solve the "double eyelid" problem of the multi-layer board of the frame, the guide column 1 adopts a stepped cylindrical structure and is divided into two sections; the outer circle size tolerance of the first section is controlled within -0.1~0mm, and the center of the paint surface is controlled to be concentric with the center of the iron hole of the first layer of the frame ≤1mm; the outer circle size tolerance of the second section is controlled within the tolerance of 0~0.1mm, and the center of the paint surface is controlled to be concentric with the center of the iron hole of the second layer of the frame ≤1mm. In this embodiment, the outer circle of the first section of the guide column 1 is φ15mm, and the size tolerance is controlled within -0.1~0mm. The length of the first section of the guide column 1 is 3.5mm based on the 4mm frame layer, and the overall length of the guide column 1 is 20mm; according to the technical requirements of the punching hole spacing, the outer circle of the second section of the guide column 1 is φ14.2mm.

[0017] The end of the drill handle 3 is a hexagonal structure, which is convenient for assembly to a rechargeable electric drill without slipping, thereby ensuring the paint removal effect.

[0018] A method for removing paint from a bonding hole of an automobile frame, comprising: S1: Assemble the drill handle 3 of the drill bit to the rechargeable electric drill, adjust the speed to 1700r / min, and ensure that the paint removal time on one side of the frame grounding hole is ≤10s; S2: insert the guide column 1 of the drill into the frame bonding hole, hold the rechargeable electric drill and keep the cutting edge 2 of the drill close to the paint-removed surface of the frame bonding hole, and remove the paint from the frame bonding hole; S3: Use a box ruler to check the dimensions of the frame grounding holes without paint, and install the grounding bolts; S4: Measure the resistance value between the two grounding bolts to ensure that the resistance value between the grounding bolts is ≤1mΩ; in this embodiment, one grounding bolt is used for grounding the gearbox housing on the frame, and the other grounding bolt is used for grounding the battery box on the frame; S5: Apply anti-rust wax around the contact surface between the grounding bolt and the unpainted surface of the frame grounding hole.

Claims

1. A paint removal tool for the bonding holes of automobile frames, characterized in that: It comprises a drill bit; the drill bit comprises a drill shank, a cutting edge and a guide column; the drill shank is arranged at one end of the cutting edge, and the guide column is arranged at the other end; the guide column adopts a stepped cylindrical structure and is divided into two sections.

2. The paint removal tool for the bonding holes of automobile frames according to claim 1, characterized in that: The drill bit is made of W6Mo5Cr4V2 with a quenching hardness of HRC61-63.

3. The paint removal tool for the bonding holes of automobile frames as claimed in claim 2, characterized in that: The outer circle dimension tolerance of the cutting edge is controlled within 0 to 0.1 mm.

4. The paint removal tool for the bonding holes of automobile frames as claimed in claim 3, characterized in that: The outer circle size tolerance of the first section of the guide column is controlled within -0.1 to 0 mm, and the center of the paint surface is controlled to be concentric with the center of the grounding hole of the first layer of the frame by ≤1 mm; The outer circle size tolerance of the second section of the guide column is controlled within 0-0.1mm, and the center of the paint surface is controlled to be concentric with the center of the grounding hole of the second layer of the frame within 1mm.

5. The paint removal tool for the bonding holes of automobile frames as claimed in claim 4, characterized in that: The end of the drill shank is a hexagonal structure.

6. A method for removing paint from a bonding hole of an automobile frame, comprising the tool for removing paint from a bonding hole of an automobile frame as claimed in any one of claims 1 to 5, characterized in that: include: S1: Assemble the drill handle of the drill bit to the rechargeable electric drill, adjust the speed to 1700r / min, and ensure that the paint removal time on one side of the frame grounding hole is ≤10s; S2: Insert the guide column of the drill into the bonding hole of the frame, hold the rechargeable electric drill and keep the cutting edge of the drill close to the paint-removed surface of the bonding hole of the frame, and remove the paint from the bonding hole of the frame; S3: Use a box ruler to check the dimensions of the frame grounding holes without paint, and install the grounding bolts; S4: Measure the resistance between the two grounding bolts to ensure that the resistance between the grounding bolts is ≤1mΩ; S5: Apply anti-rust wax around the contact surface between the grounding bolt and the unpainted surface of the frame grounding hole.

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