T/CSAE 92-2018The guideline of structure design of sedan body in white for anticorrosion (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1 -.2009.

Some elements of this standard may involve patents, and the standard issuing authority does not assume responsibility for identifying these patents.

This standard was proposed by the Automotive Anticorrosion and Aging Branch of the China Automotive Engineering Society.

This standard was drafted. Huachen Automobile Group Holdings Co., Ltd., Jianghuai Automobile Group Co., Ltd., Great Wall Motors Co., Ltd., Beijing New Energy Automobile Co., Ltd., Chery Automobile Co., Ltd., Shanghai Gelin Times Information Technology Co., Ltd.

Co., Ltd., FAW-Volkswagen Automotive Co., Ltd., Chongqing Changan Automobile Co., Ltd., Shanghai Automotive Group Co., Ltd.

Company passenger car company, China First Automobile Co., Ltd. Tianjin Technology Development Branch, SAIC-GM-Wuling Automobile Co., Ltd.

Co., Ltd., Hebei Hongxing Automobile Manufacturing Co., Ltd.

1 Scope

This guidance specification sets out the basic guidelines for the design of body-in-white anti-corrosion structures.

This guiding code is applicable to the design of the white body anti-corrosion structure of ordinary passenger cars, and the white body anti-corrosion structure design of other models.

Refer to this specification for reference.

2 Normative references

The following standards are essential for the application of this document. All dated references, all subsequent modifications (not the inclusion of errata content or revisions does not apply to this specification, but parties to agreements based on this specification are encouraged to study the use of these documents.

The possibility of the latest version.

GB/T 3730.1-2001 Terms and definitions for types of vehicles and trailers GB/T 4780 -2000 Automotive Body Terminology

3 Terms and definitions

4 White body anti-corrosion structure design

5 Clearance, or more b

The longitudinal beam and the floor cavity can also be perforated in the floor the outer and lower longitudinal beams of the cavity of the hair shaft are 20 to 30, with a spacing of 100 to.200.

Between the top cover and its reinforcing beam Cavity beam Clearance between the top cover and the beam (non-glued parts) 15 to 30 in diameter, spacing 100 to.200 Clearance 5 or more Cavity in the upper frame of the side wall Roof side beam inner panel Side frame upper frame reinforcement plate Side frame upper frame reinforcement plate and side wall outer plate gap 15 to 30 diameter, 100 to.200 pitch, perforated 15 to 30 diameter, 100 to.200 pitch, perforated Clearance 5 or more Cavity in the column Column inner panel Column stiffener Clearance between the pillar stiffener and the side panel outer panel 15 to 30 diameter, 50 to.200 pitch, perforated 15 to 30 diameter, 50 to.200 pitch, perforated Clearance 5 or more Cavity in the skirt threshold Threshold reinforcing plate Side panel outer panel Clearance between the outer panel of the sill and the sill reinforcement 20 to 30 diameter, 150 to 300 pitch, perforated 20 to 30 diameter, 150 to 300 pitch, perforated Clearance 5 or more c Between the side panel and the wheel cover Cavity Wheel cover inner panel Clearance between wheel cover outer panel and side panel outer panel 20 to 35 in diameter, 150 to 300 pitch Clearance 5 or more Engine cover, trunk lid Cavity Flap inner plate, tailgate inner plate Inner beam crossover Clearance between outer and reinforcing plates 20 to 30 or equivalent long round holes with a pitch of.200 or less Diameter larger than 1/3 of the diagonal length Clearance 5 or more Between the four inner panels and the stiffeners Cavity Reinforcing plate Door inner panel and reinforcing panel and door inner panel and outer door panel Clearance 15 to 30 in diameter, 50 to.200 pitch Clearance 5 or more a Applicable to the inner cavity reinforcing plate, through the opening, to promote the circulation of liquid, avoiding the formation of a closed cavity inside the cavity;

b The plate gap size of the electrophoretic coating part is usually not less than 5mm. Under the conditions allowed by the body structure, the gap should be increased as much as possible to optimize the interior of the body.

Surface treatment effect;

c If it is necessary to reserve the installation space of the potential measuring device, it is recommended to set the gap between the outer sill plate and the sill reinforcement plate to be more than 10mm;

d In order to achieve the film thickness design requirements, it is necessary to consider the specific structure of the model, such as the board spacing, cavity structure, coating process conditions, material properties and other factors;

The body-in-white assembled with the sub-assemblies is also recommended to use computer simulation technology to assist in the analysis and evaluation to enhance the ability to evaluate complex structures;

e Appendix A provides the electrophoretic coating characteristics of a typical structure to aid in the understanding of the above-mentioned opening design.

4.2.1.2 Design of drainage structure

a) The number of drain holes should be set to ensure the flow and discharge of the coating material to prevent liquid volume lag;

b) the drain hole should be set as low as possible;

c) Openings, bosses, sheet metal offset structures, etc. can be used for draining design;

d) In the treatment of metal surface, in order to avoid pockets and sputum, the drain hole should be designed to completely discharge the liquid within the specified time;

e) The drain hole of the whole vehicle state should not be interfered or blocked by the sealant or the like to avoid obstructing the drainage;

5T/CSAE 92 -.2018

4.2.1.3 Exhaust structure design

a) avoid gas retention, the surface of the metal substrate is insulated by air, affecting the surface treatment of the metal;

b) set the vent hole or exhaust rib in the area where the air stays (the highest point of the body into the groove inclination);

c) vent holes are provided at both ends of the cavity structure to avoid gas trapping in the inner cavity when entering or leaving the groove;

d) Openings, boss structures, sheet metal offset structures, etc. can be used for exhaust design.

4.2.2 Seal structure design

4.2.2.1 Common sealing forms and typical parts of the body in white, see Table 2;

Table 2 Common seal forms and typical parts of the body

Typical sealing form Typical sealing part Typical sealing form Typical sealing part 1. The front fence and the front floor overlap 2. Front floor and middle floor joints 3. Middle and rear floor joints 4. The front floor and the front floor channel overlap 5. The overlapping part of the top cover and the side outer panel

6 Front and rear plate lap joints of front wheel cover

1. The sill reinforcement plate and the side panel outer panel overlap 1. Closure hem 2. Side panel outer panel and rear wheel cover outer panel edging part 3. Top cover and skylight frame edging 1. Floor side panels, sill reinforcement panels, side panels Plate lap joint 1. The rear floor is overlapped with the rear panel (rear lock) Part 1. The side panel outer panel is overlapped with the upper windshield lower beam upper plate Part 2. The upper plate of the trunk beam is overlapped with the taillight cover plate Part 1. The inner cover of the wheel cover and the outer cover of the wheel cover 2. Front floor and floor side panel overlap 3. A pillar inner panel and front wall baffle overlap 4. The front wheel cover and the firewall overlap 1. Top cover and skylight frame edging 2. The rear wheel cover outer panel and the side outer panel overlap 1. The rear wheel cover outer panel and the side outer panel overlap 1. A pillar under the inner panel and the firewall 2. The side panel outer panel and the taillight side lamp cover panel overlap 3. The front wheel cover plate and the front shock absorber seat overlap 4. The joint between the rear panel and the side panel 1. The rear wheel cover outer panel and the side panel overlap 1. The front wheel cover and the front shock absorber overlap 2. The joint between the side wall outer panel and the fuel tank filling port Represents spot weld sealant;

Represents weld sealant;

6T/CSAE 92 -.2018

4.2.2.2 Closed seal

a) Flange seals shall be used in the gap between the closures and the edges of the edging shall be sealed with weld sealant;

b) The edging structure shall ensure the sealing space of the hem rubber and the weld sealant. The edging form is generally divided into straight edging and water edging.

An example of edge related dimension design, as shown in Figure 2;

The unit is mm

Description.

1-L1 is the length of the outer plate flanging;

2-L2 is the edge distance from the edge of the edge to the inner plate;

3-L3 is the width of the inner and outer plates.

Cover size description. the edge size of the outer edge of the outer edge of the L1 is 8 ~ 10, the water droplets L1 can be appropriately increased; the width of the overlap surface of the inner and outer panels L3 should be greater than 5, the overlap width is too small Conducive to the sealing of the inside of the hem of the hem edge; the rounding distance L2 of the edge of the hem to the inner panel should be greater than 5 to ensure the feasibility of coating the sealant, but the distance should not be too large. It is recommended that L2 be 5-8 , Otherwise it affects the electrophoresis performance.

Figure 2 closure edging form

c) The rubberized form of the edging part of the closure is shown in the following table, and the corner of the hem is slightly different from the general part, as shown in Figure 3;

The unit is mm

Description.

1-folded edge glue;

2- Weld sealant;

3- The inner plate covers the rear R angle.

The coated hemming rubber should overflow the outer plate to cover the rear R angle, L > 2.

Figure 3 Closed form of glue

d) It is recommended to apply anti-rust wax to the gap of the inner cavity of the closure, as shown in Figure 4;

Description.

1- anti-rust wax;

2- Weld sealant;

3- Spot weld sealant.

The example of the cross section in the figure is the front door, and the remaining rust-proof wax coating forms of the door and the hood inner cavity refer to this section; in general, the trunk lid is defined as a dry area.

The interior is not coated with anti-rust wax. If the risk of corrosion inside the trunk lid is verified, the coating may be considered.

Figure 4 Wax form of the lap joint gap of the closure

L1 L2

L3 L3

L1 L2

a) ordinary edging (straight edging) b) water edging twenty two

a) hem portion b) corner portion Section AA 7T/CSAE 92 -.2018

e) It is recommended to apply weld sealant to the joint between the hinge and the body; the joint between the hinge and the body is recommended.

Welding sealant or anti-corrosion wax;

f) The closure exposed process hole is recommended to be sealed with a gland or adhesive.

4.2.2.3 Body seal

a) Weld sealant

1) In order to apply the weld sealant, it is necessary to control the thickness of the sheet metal overlap gap of the body-in-white, which is usually not more than 3mm. In principle, each the smaller the weld of the large assembly or sheet metal lap, the better, according to the coating process and quality requirements of the part, the sheet metal lap joint the gap is appropriately reduced, such as the sharp corner of the tail light and the overlapping surface of the curved surface;

2) In order to apply the weld sealant, a plurality of sheet metal superposed structures should be overlapped in order, and the edge of the steel sheet is exposed layer by layer;

3) For the application of weld sealant, the direction of the sheet metal joint should be oriented towards the operator, avoiding the sheet metal seam being blocked from being visible or glued.

The tool cannot enter;

4) In order to apply the weld sealant, it is advisable to avoid the design of the bracket, the pillar and the reinforcing plate that block the sealing joint, otherwise welding will occur.

Seam sealant can not be coated, but can not seal the gap structure;

5) For the application of weld sealant, it is not advisable to have open or unsupported corners, see Figure 5;

Figure 5 sheet metal connection structure

6) For the coating of weld sealant, the design of the rubberized structure of the flange spot welding part, see Figure 6;

The unit is mm

Description.

1- Weld sealant;

The spot welding flange rubber coating structure usually adopts the wrong side design, and the wrong side is usually 3 to 5, and the size L should be at least 3 to ensure the application of the weld sealant.

Figure 6 Design of the offset structure of the spot welding flange

7) For the application of weld sealant, the spot weld flange of the sheet metal joint towards the bottom of the vehicle should be designed as a "J" or "L" flange.

Avoid open connection forms, flanges should be free of stamping gaps;

8) In order to apply the weld sealant, the outer corner overlaps the overlapped part to provide a flat structure, see Figure 7.

The unit is mm

Description.

1- Weld sealant

The plane of the outer corner overlapping the gap portion is usually 3 to 5. To ensure the coating of the weld sealant, the dimension L should be at least 3.

Figure 7. The outer corner overlaps the overlapping part

Open structure

a) avoid b) preference 8T/CSAE 92 -.2018

9) For the coating of weld sealant, the body and seal, bonding system should be reserved for sheet metal offset.

b) spot welding sealant

1) The joint between the side wall outer panel and the trunk flow tank should be applied in combination with the spot welding sealant and the weld sealant;

2) The overlapping gap in the lower part of the skirt should be applied in combination with the spot welding sealant and the weld sealant;

3) The bonding and sealing of the top cover to the side frame, it is advisable to apply the spot welding sealant and the weld sealant in combination;

4) For seams that have been covered by stiffeners or pillars or that cannot be applied in the paint shop when entering the paint shop, in the welding shop Coating spot welding sealant;

5) The sheet metal joint is facing the outside of the vehicle bottom. It is recommended to apply spot weld sealant on all matching surfaces, see Figure 8;

Description.

1- side outer panel;

2- sill reinforcement plate;

3- floor side panels;

4- Spot weld sealant.

Figure 8. Sheet metal bottom seam seal at the bottom of the door

6) The welding body should be assembled in such a direction that the spot welding sealant is in contact with the surface perpendicularly to achieve the action of squeezing and should avoid slippage.

Contacting causes the sealant to be wiped off from the seam;

7) In order to ensure the reliability of the welding sealing performance, sufficient welding space should be provided on both surfaces of the welding;

c) anti-stone coating (PVC) in order to reduce the stone damage of the body...