手术是创伤和畸形矫正类骨科疾病所必不可少的治疗手段，行业标准规定手术床的台面尺寸为200×48cm。肥胖人体型较宽，而手术床较窄，已不能满足与日俱增的肥胖人群的需求，肥胖患者在手术过程中因胳膊无处放置而存在诸多不便。该论文针对肥胖患者在手术过程中遇到的实际问题，设计制造了一种托臂件及相配套的模具，并对托臂件的材质及注塑工艺进行了研究。得出以下研究结论： （1）该托臂件为内弯型，使用方便，可根据患者的肥胖程度灵活调节。尺寸参数为：长40cm、宽15cm、厚0.4cm、弯臂半径5cm、弯臂弧度角为120°； （2）硅烷偶联剂处理纤维的最优工艺是：硅烷偶联剂溶液（10wt%）用量20mL、时间30min、温度60℃；玻璃纤维经硅烷偶联剂处理后按20wt%加入至聚碳酸酯树脂中制得纤维增强复合材料，其拉伸强度增长了104.5%，SEM显示纤维增强复合材料的破坏呈脆性断裂，强度显著提高而韧性略有下降； （3）用相容剂聚丙烯接枝马来酸酐（PP-g-MAH）改善聚丙烯（PP）/聚碳酸酯（PC）的界面制备共混材料，当PP-g-MAH和PP的添加量分别为6wt%和10wt%时，复合材料的拉伸强度下降3.8%，而断裂伸长率增大6.7%，共混物的熔体流动指数增加了21.7%，PP有效地改善了共混物的加工性能，且对拉伸强度的影响较小。 （4）经比较纤维增强复合材料与PP/PC共混材料的力学与加工性能，PP/PC共混物更适用于制备该托臂件制品。其注塑工艺为：螺杆转速40r/min、射咀温度240℃，料筒一段温度255℃、二段温度245℃、三段温度240℃，一次注射压力90MPa、二次注射压力80MPa、三次注射压力40MPa，保压时间30s、冷却时间30s，模具温度90℃，背压0.6MPa。通过模拟应用检验，所制备的托臂件产品可连续载荷数月，达到了设计要求。

Surgical operation is commonly used for the treatment of trauma and deformity correction. The size of operating table is 200×48cm in accordance with standards. The operation table is too narrow to put down the arms of those are obese , causing inconvenience in operation process. To deal with practical problems in the treatment of obese patients, portable bracket with its corresponding mold was designed and prepared, and also portable bracket material and injection molding process were studied. Conclusions as follows: (1) Portable bracket curl inwards to use easily, and could be flexibly adjusted according to the somatotype of the patients. Size parameters as shown: length was 40cm, width was 15cm, thickness was 0.4cm, curved arm radius was 5cm, curved radian angle was 120°; (2) The optimal process of silane coupling agent treating fiber was: dosage of silane coupling agent solution was 20mL for 30min, temperature at 60℃. Fiber reinforced composite was prepared when added glass fiber 20wt% to polycarbonate resin, while that of the fiber was modified by silane coupling agent. The tensile strength of composite increased by 104.5%, and SEM displayed composite damage was brittle fracture, and enhanced the strength and decreased toughness slightly; (3) Compatibilizing agent polypropylene grafted with maleic anhydride (PP-g-MAH), which improved interface of polypropylene(PP) and polycarbonate(PC) to prepare blending materials. When added 6wt% PP-g-MAH and 10wt% PP, the tensile strength of the composite decreased 3.8%, while the elongation at break increased 6.7%, melt flow index of the blends increased 21.7%. PP effectively improved the processing properties of the blends, and had little influence on the tensile strength; (4) Compared the mechanical and processing properties of fiber reinforced composite materials and PP/PC blend, PP/PC blends is more suitable for the preparation of the bracket arm. The injection process was: screw speed was 40r/min, nozzle temperature was 240℃, the barrel’s first temperature at 255℃, the second temperature at 245℃, third section at 240℃,and the first injection pressure was 90MPa, the second was 80MPa, the third was 40MPa, press time was 30s, cooling time was 30s, he temperature of mold was 90℃, and backpressure was 0.6MPa. Through simulation test, the bracket support could sustain continuous load for several months and reach design requirements.