tailieunhanh - Process Selection - From Design to Manufacture Part 11

Tham khảo tài liệu 'process selection - from design to manufacture part 11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 234 Selecting candidate processes Dissimilar materials can cause residual stresses on cooling due to different expansion coefficients especially if heat is used in the curing process. Problems encountered with materials which are prone to solvent attack stress cracking water migration or low surface energy. Problems may be encountered in bonding materials which have surface oxides loose surface layers or which are plated or painted de-lamination may occur from the base material . Stress distribution over the joint area more uniform than other joining techniques. Joint fatigue resistance improved due to inherent damping properties of adhesives to absorb shocks and vibrations. Heat sensitive materials can be joined without any change of base material properties. Adhesives generally have a short shelf life. Optimum joint strength may not be immediate following assembly. Various adhesives can operate in temperatures up to approximately 250 C. Control of surface preparation adhesive preparation assembly environment and curing procedure important for consistent joint quality. In surface preparation important to remove any contaminates from the joint area such as oxide layers paint and thick films of grease and oil to aid wetting of the joint. Mechanical abrasion grit blasting abrasive cloth solvent degreasing chemical etching anodizing or surface primers may be necessary depending on the base materials to be joined. Adhesive almost invisible after assembly. Joint surface free of irregular shapes and contours as produced by mechanical fastening techniques and welding. Joint inspection difficult after assembly and NDT techniques currently inadequate. Quality control should include intermittent testing of joint strength from samples taken from the production line. Quality control of adhesive mix also important. Consideration of joint permanence important for maintenance purposes. Bonded structures are not easily dismantled. Joint strength may deteriorate with time and .

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