Cooling Contraction Mode; Made-Up In Digging Style And Restore - Chery QQ Service Manual

Chery QQ Service Manual Body System

(3) Cooling contraction mode

You can choose appropriate cooling mode according to stretchable degree of sheet metal after
evacuation from flame, different cooling mode result in different shrinkage.
1) Natural cooling contraction. That means natural cooling in the air, which is applicable to
deformation place with smaller shrinkage.
2) Water cooling. You can cover the heating area with wet cotton cloth in order to make
cooling, the shrinkage is deeper in degree than natural cooling ones, but it is easy for the sheet
metal to be tendering.
3) Combination natural cooling with hammer knocking, it happens frequently to use hand
hammer and spacer, knock the surrounding of heating area promptly, enlarge the contraction
stress and shrinkage, until beaten that position, you'd better use wooden hammer, you'd better
not put more pressure, so that the sheet metal is not to be stretched once more.

2.2.3 Made-up in digging style and restore

If local part of door sheet metal piece rot away or the damage is too serious to be repaired, you
shall dig that damaged part and enchase with relevant substitute materials. It includes pasting
made-up and digging made-up:
(1) Check the circumstances of damage make clear the repair scope.
(2) Make paper sample in accordance with the defined repair scope.
(3) Scribe lay off on the sheet metal according to paper sample, leave appropriate processing.
(4)Adopt suitable shaping method, make the enchase piece tally with parts needing to be
repaired.
(5)Keep the enchase pieces close to the requested position, draw the bordering line of the parts
needing to be cut, then cut off the useless part, You can adopt method such as gas cutting
shear ,bring two things into contact properly.
(6) Weld the welded seam with oxygen acetylene weld or CO2 blocking welding. Weld properly
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Chery Automobile Co., Ltd