6、制品后处理:对于形状复杂、带有金属嵌件、使用温度极低或很高的制品有必要进行后处理--消除或减少内应力。
方法:制品置于烘干箱后开始升温,由室温升至100-105时保温10-20min,继续升温至120-125时保温30-40min,然后缓慢冷却至60以下取出。
成型过程问题
产生原因 及解决办法
1、银丝
a、原材料受潮----干燥原料
b、树脂过热分解----减低成型温度
c、螺杆压缩比小,背压不足----增加背压
d、模温过低----加热模具
e、排气不良----模具分型面开排气槽
2、气泡
a、原材料受潮----干燥原料
b、排气不良----改进模具设计
3、树脂变色、黑点
a、料筒、喷嘴积料----清理料筒和喷嘴
b、成型温度过高----降低成型温度
4、制品未充满
a、物料塑化不够----提高料筒温度
b、模具温度过低----提高模具温度
c、喷嘴溢料----调整模具位置
d、注射压力过低----提高注射压力
6. Ukunyangwa emva kwemveliso: Kwimveliso ezinesimo esiqhelekileyo, iintsimbi zifaka, kunye nezishushu eziphantsi okanye eziphezulu zokusebenzisa, kufuneka ziqhubeke unyango olusezantsi ukususa okanye ukunciphisa uxinzelelo lwangaphakathi.
Indlela: Imveliso ibekwe kwi-oven ebomileyo kwaye iqala ukushushu. Xa ubushushu bengumbi buyaphuma ukuya ku 100-105, igcinwe utsha imizuzu eli-10-20, kwaye xa iqhubeka ukushushu ukuya ku 120-125, igcinwe utsha imizuzu engama-30-40. Ngoko, ipholiswe ngokucotha ukuya ngaphantsi kwe-60 kwaye ithathwe ngaphandle.
Imiba yenkqubo
Izizathu nezisombululo
Umsonto wesilivere
a. Izinto ezikhalazekileyo ezinzima - izixhobo ezikhalazekileyo ezimileyo
b. Ukutshisa ukutshisa okugqithisileyo okugqithisileyo - ukunciphisa ubushushu bokutshisa
c. Low screw compression ratio, insufficient back pressure - increase back pressure
d. Ubushushu bobunzulu obuphantsi kakhulu - ubushushu bobunzulu
e. Umphefumlo omncinane - ukuvulwa kwemigangatho yemithwalo yemithwalo esetyenzisweni
2. Imibhobho
b. Ukuphucula ukulungisa
3. Inkcazelo yesixhobo somhlaba kunye neendawo ezimnyama
a. Ukudibaniswa kwempahla kwibharili yempahla kunye nengxolo - ukuhlambulula ibherili yempahla kunye nengxolo
b. Ubushushu obutyibilikileyo obuphezulu - hlisa ubushushu obutyibilikileyo
4. Imveliso ayigcwaliswanga ngokupheleleyo
a. Insufficient material plasticization - raising the temperature of the material barrel
b. Ubushushu bomlilo obuphantsi kakhulu - unyusa ubushushu bomlilo
Stencils
d. Uxinzelelo lwesifo oluphantsi kakhulu - nyusa uxinzelelo lwesifo