A method for positioning a double B-pillar of an extended body

Abstract

The present invention discloses a method for positioning a double B-pillar on an extended body, which relates to the field of trial production of body parts. According to the dimensions of the extension and modification, on the white body, a ruler is used to measure and determine the cutting position, and the white body is cut into front and rear parts. A side panel of the same model as the white body is selected, and a grinding wheel is used to cut and separate the B-pillar according to the marked line. A feature surface is directly selected at the rear door opening of the white body. The three-dimensional solid template can be reinforced by means of plugging and welding point fixing, adopting a form of four horizontal and three vertical, and many weight-reducing holes can also be cut in the middle of each plate, ensuring the accuracy of the three-dimensional solid template. A welder is used to manually weld and match the inner plate of the B-pillar with the rear section of the body, the upper part of the B-pillar with the front section of the body, and the lower part of the B-pillar with the front section of the body. The operator can use it conveniently and quickly, and the positioning is accurate.

Description

Technical Field

[0001] The present invention relates to the field of trial production of vehicle body parts, and in particular to a method for positioning double B-pillars of a lengthened vehicle body. Background Art

[0002] A car's B-pillar refers to the vertical beam of the vehicle body between the front and rear seats of the cockpit, extending from the roof to the bottom of the car. It supports the roof, separates the doors, increases the strength of the vehicle body, and enhances its ability to resist side impacts. The process of lengthening the body-in-white (BIW) involves moving and repositioning the B-pillar. Especially when the BIW is extended by more than 500mm, two B-pillars will exist on a single side of the BIW, referred to as double B-pillars. Currently, the technical means of repositioning the newly added B-pillars basically uses a specialized welding fixture for positioning. Existing technologies have problems such as high cost, long manufacturing cycle, and inconvenient operation of the double B-pillar positioning fixture for the extended body.

[0003] Document (CN 208544336 U) discloses an extended vehicle body comprising a front half, a rear half, and an extended portion connecting the front and rear halves. The front and rear halves are derived from the same short vehicle and constitute the front and rear halves of the short vehicle body. However, the document does not describe a method for positioning the dual B-pillars of the extended vehicle body. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention conceives a method for positioning the double B-pillars of a lengthened vehicle body. Different numbers of characteristic cross sections are selected as positioning references according to different vehicle models, thereby solving the problems of high cost of B-pillar positioning fixtures, long manufacturing cycle and inconvenient operation.

[0005] The technical solution adopted by the present invention is: a method for positioning the double B-pillars of a lengthened vehicle body, characterized in that it includes the following steps:

[0006] 1) Based on the lengthened and remanufactured dimensions, a ruler is used to measure and determine the cutting position on the body-in-white. A cutting line is drawn in the Y direction of the body-in-white using a paint pen. Following the cutting line, a grinder is used to cut the body-in-white into two parts, front and rear.

[0007] 2) Selecting a side panel of the same model as the body-in-white, selecting seven characteristic surfaces (four horizontal and three vertical) on the side panel assembly, selecting a three-dimensional template based on the seven characteristic surfaces of the side panel, marking the B-pillar of the side panel, and using a grinding wheel to cut and separate the B-pillar along the marked lines;

[0008] 3) Separating the upper inner and outer panels of the B-pillar after cutting and separation in step 2) using a grinding machine;

[0009] 4) On the white body cut in step 1), manually match the B-pillar separated by cutting in step 3);

[0010] 5) According to the matching result in step 4), cut and trim the B-pillar again with a grinding wheel;

[0011] 6) At the position of the rear door opening of the white body cut in step 1), accurately position the B-pillar with the three-dimensional template;

[0012] 7) Manually match the inner panel of the B-pillar with the rear section of the body, the upper part of the B-pillar with the front section of the body, and the lower part of the B-pillar with the front section of the body;

[0013] 8) Weld the inner panel of the B-pillar manually matched with the rear section of the body, the upper part of the B-pillar with the front section of the body, and the lower part of the B-pillar with the front section of the body in step 7) with a welding machine;

[0014] 9) Manually match the outer panel of the B-pillar and weld the manually matched outer panel of the B-pillar with a welding machine;

[0015] 10) Grind the weld seam of the outer panel of the B-pillar with a grinding wheel.

[0016] Preferably, in step 1), the ruler is a tape measure.

[0017] Preferably, in step 1), the cutting position is at the position of the rear door behind the B-pillar.

[0018] Preferably, in steps 8) and 9), the welding machine is a carbon dioxide welding machine.

[0019] The beneficial effects of a method for positioning double B-pillars of an extended body are as follows:

[0020] A method for positioning double B-pillars of an extended body, according to the size of the extended modification, on the white body, uses a ruler to measure and determine the cutting position, cuts the white body into two parts, selects a side panel of the same model as the white body, uses a grinding wheel to cut and separate the B-pillar according to the marked line, directly selects a feature surface at the rear door opening of the white body, the three-dimensional template can be reinforced by plugging and welding point fixing, adopts a four-horizontal and three-vertical form, and many weight-reducing holes can also be cut in the middle of each plate, ensuring the accuracy of the three-dimensional template, welding the inner panel of the B-pillar manually matched with the rear section of the body, the upper part of the B-pillar with the front section of the body, and the lower part of the B-pillar with the front section of the body with a welding machine, which is convenient and fast for the operator and has accurate positioning. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the white body to be extended and cut placed on a special extended welding clamp in the embodiment;

[0022] Figure 2 In the embodiment, it is a schematic diagram of the positioning of the three-dimensional solid template on the side panel.

[0023] Figure 3 In the embodiment, it is a schematic diagram of the B-pillar after cutting.

[0024] In the figure: 1. Body in white, 2. Three-dimensional solid template, 3. Extended special welding clamp, 4. Side panel, 5. Front end of the roof panel, 6. Upper end of the B-pillar, 7. Rear end of the roof panel, 8. Lower end of the B-pillar. Specific implementation manner

[0025] The following combines the attached Figures 1 to 3 and specific implementation manners to further elaborate on the present invention in detail. To make the purpose, technical solution, and advantages of the implementation manner clearer, the accompanying drawings in the embodiments of the present invention will be combined, and the technical solutions in the embodiments will be clearly and completely described. The specific implementation manners described herein are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] A method for positioning double B-pillars of an extended body includes the following steps:

[0027] 1) As shown in the attached Figure 1 , place the body in white 1 that needs to be cut and extended on the extended special welding clamp 3. There are 8 positioning points in total for the extended special welding clamp 3 and the body in white 1, with 4 positioning points at the front and rear of the body in white 1 respectively, generally selected from the RPS reference of the body in white 1. First, use tools such as an electric drill on the body in white 1 assembly to remove the weld points of the roof panel assembly and the side panel to facilitate the subsequent matching welding of the double B-pillars. According to the size of the extended modification, on the body in white 1, use a tape measure to determine the cutting position, draw a cutting line with a paint pen in the Y direction of the body in white 1, and according to the drawn cutting line, use a grinding wheel to cut the body in white 1, cutting the body in white 1 into two parts, the front and the rear;

[0028] 2) As shown in the attached Figure 2 , select a side panel 4 of the same model as the body in white 1. Select 7 feature surfaces of four horizontal and three vertical on the side panel 4 assembly. Select a three-dimensional solid template 2 according to the 7 feature surfaces of four horizontal and three vertical of the side panel. Draw lines on the B-pillar of the side panel 4. For the part of the upper end 6 of the B-pillar close to the rear end 7 of the roof panel, draw a line after reserving a margin according to the body cutting position. Draw a line for reserving a margin for the upper end 6 of the B-pillar close to the front end 5 of the roof panel. Draw a line after reserving a margin according to the extended size on the side of the lower end 8 of the B-pillar close to the floor. As shown in the attached Figure 3 , use an electric grinding wheel to cut the newly added left and right B-pillars according to the drawn lines, and use a grinding wheel to cut and separate the B-pillar according to the drawn lines;

[0029] 3) Separate the upper inner and outer panels of the B-pillar after the cutting and separation in step 2) with a grinding wheel;

[0030] 4) On the white body after cutting in step 1), manually match the B-pillar after the cutting and separation in step 3);

[0031] 5) According to the matching result in step 4), cut and trim the B-pillar again with a grinding wheel;

[0032] 6) At the position of the rear door opening of the white body after cutting in step 1), accurately position the B-pillar with the three-dimensional template;

[0033] 7) Manually match the inner panel of the B-pillar with the rear section of the body, the upper part of the B-pillar with the front section of the body, and the lower part of the B-pillar with the front section of the body;

[0034] 8) Weld the inner panel of the B-pillar with the rear section of the body, the upper part of the B-pillar with the front section of the body, and the lower part of the B-pillar with the front section of the body manually matched in step 7) with a carbon dioxide welding machine;

[0035] 9) Manually match the outer panel of the B-pillar and weld the manually matched outer panel of the B-pillar with a carbon dioxide welding machine; 10) Grind the weld of the outer panel of the B-pillar with a grinding wheel.

[0036] The above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included. For those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. A method for positioning a double B-pillar of an extended body, characterized in that It includes the following steps: 1) According to the dimensions of the lengthening and modification, on the white body, use a ruler to measure and determine the cutting position, draw a cutting line around the white body in the Y direction with a paint pen, and according to the cutting line, use a grinding wheel to cut the white body into two parts, the front part and the rear part; 2) Select a side panel of the same model as the white body, select 7 characteristic surfaces of four horizontal and three vertical on the side panel assembly, select a three-dimensional solid template according to the 7 characteristic surfaces of four horizontal and three vertical of the side panel, draw a line on the B-pillar of the side panel, and use a grinding wheel to cut and separate the B-pillar according to the drawn line; 3) Separate the upper inner panel and outer panel of the B-pillar after cutting and separating in step 2) with a grinding wheel; 4) Manually match the B-pillar after cutting and separating in step 3) on the white body cut in step 1); 5) According to the matching result in step 4), use a grinding wheel to cut and trim the B-pillar again; 6) At the position of the rear door opening of the white body cut in step 1), use the three-dimensional solid template to accurately position the B-pillar; 7) Manually match the inner panel of the B-pillar with the rear section of the body, the upper part of the B-pillar with the front section of the body, and the lower part of the B-pillar with the front section of the body; 8) Weld the inner panel of the B-pillar and the rear section of the body, the upper part of the B-pillar and the front section of the body, and the lower part of the B-pillar and the front section of the body manually matched in step 7) with a welding machine; 9) Manually match the outer panel of the B-pillar, and weld the manually matched outer panel of the B-pillar with a welding machine; 10) Use a grinding wheel to polish the weld of the outer panel of the B-pillar.

2. The method for positioning a double B-pillar of an extended body according to claim 1, characterized in that, In step 1), the ruler is a tape measure.

3. A method for positioning a double B-pillar on an extended vehicle body according to claim 1, characterized in that, In step 1), the cutting position is at the position of the rear door behind the B-pillar.

4. A method for positioning a double B-pillar of an extended body according to claim 1, characterized in that In steps 8) and 9), the welding machine is a carbon dioxide welding machine.

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