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                          河北华利机械配件有限公司

                          汽车JK 把手注射模设计制造

                          2013/5/16 14:07:59

                          1 SUJIANJIEGOUJICHENGXINGGONGYIFENXI

                                  汽车JK把手塑件如图1所示,外形尺寸73.28mm×45.6mm×34.5mm,对强度、硬度、抗冲击性和耐磨性有较高的要求。图1中K表面是塑件重要的外观面,不允许有气纹、缩痕、飞边、浮纤、烧焦、熔接痕、光亮带等缺陷,表面皮纹不能有人为因素导致的划痕及碰伤;精度要求较高的尺寸有宽度(45.6±0.1)mm、开口销孔ϕ(4.0±0.1)mm和拉线孔ϕ(6.2±0.1)mm,后二者若采用侧向分型,则须保证模具抽芯机构的精度。
                                  为满足塑件的性能和精度要求,采用玻璃纤维增强尼龙塑料,材料牌号为70G33HS1L,主要成分是PA66树脂和含量在33%~34%的玻璃纤维。加入玻璃纤维后的PA66,具有更好的力学性能,尤其是强度和耐磨性大幅提高,而且可以将收缩率降低至0.2%~1%,有利于改善塑件的尺寸稳定性。不足之处是熔体因熔融黏度增大而流动性降低,出现熔体充填困难以及因熔体流动定向引起的各向异性和塑件翘曲变形等缺陷,而且玻璃纤维与PA66树脂材质存在差异,容易产生相容性问题,在塑件成型过程中出现玻纤外露等表面质量不良现象。因此,需要有针对性地进行模具结构设计和注射成型工艺的制定,以获得高质量的把手塑件。

                          2.1 FENXINGMIANSHEJI

                                  QICHEJKBASHOUSUJIANWEIZHONGDENGPILIANGSHENGCHAN,GENJUSUJIANWAIXINGCHICUN,MOJUCAIYONG1MO2QIANGDUICHENGBUZHI,ZHUFENXINGMIANANTU1ZHONGP/LXIANSHEZHI,JUTIXINGSHIRUTU2SUOSHI。SUJIANQIAOJIAWAICEAORUBUWEIJIGEKONGCAIQUZHENGTICHOUXIN,YINCIKEXUANZEJIAOJIANDANDEDONGMOCHOUXINJIEGOU。

                          2.2 JIAOZHUXITONGSHEJI

                          123棋牌室        TU3WEIMOJUJIAOZHUXITONGSANWEITU,CAIYONGKAISHEZAICECHOUXINFENXINGMIANSHANGDECEJIAOKOUJINLIAO。PA66DENINGGUSUDUHENKUAI,ERQIEZAIJIARUBOLIXIANWEIHOULIUDONGXINGYOUSUOJIANGDI,YINCIJIAOKOUCHICUNBUYITAIXIAO。JIAOKOUSUOZAIBUWEIDESUJIANBIHOUt=2.2mm,TONGCHANGDUIYUWEIJIABOXIANDEPA66,JIAOKOUHOUDUBUYIXIAOYU0.5t,JI0.5×2.2=1.1 mm,ERDUIYUJIARUBOXIANDEPA66ZEYINGSHIDANGJIADAJIAOKOUCHICUN,SHEJICHUSHICHICUNWEI1.3mm×1.2mmDEJUXINGJIAOKOU,DAISHIMOHOUGENJUCHONGTIANQINGKUANGZAIZUOXIUZHENG。JIAOZHUXITONGDEJIEGOUJICHICUNRUTU4SUOSHI,WEIYUCECHOUXINFENXINGMIANSHANGDEGEDUANFENLIUDAOXUCAIQUTIXINGJIEMIAN,BINGQIEYAOQIUKAISHEZAICEXINGXINHUAKUAIYICE,YIBIANYUTUICHUSUJIANSHILIUDAONINGLIAONENGSHUNLITUOLUO。TONGGUOPro/ESULIAOGUWENXUANJIANMOKUAIJINXINGLIUDONGFENXIHEYOUHUABIJIAO,CHUBUZHENGSHIGAIJIAOZHUXITONGNENGGOUMANZUZHUSHECHENGXINGYAOQIU。

                          2.3 MOJUJIEGOUSHEJI

                          123棋牌室        MOJUJIEGOURUTU5SUOSHI。XINGQIANG、XINGXINHECEXINGXINHUAKUAIDENGCHENGXINGLINGJIANJUNSHIYONGRIBENJINKOUNAK80YUYINGSULIAOMOJUGANG,YUYINGYINGDUWEI38~41 HRC,GAICAILIAODIANJIAGONGJIPAOGUANGXINGNENGLIANGHAO,JUYOUJIAOGAODEYINGDU。MOJUXUANYONGLIANGBANMOMOJIA,CAIYONGXIEDAOZHUCHOUXINJIGOU。WEITIGAOCEXINGXINHUAKUAIDEYUNDONGPINGWENXING,LIANGHUAKUAIFENBIEYOU2GENXIEDAOZHUQUDONG,XIEDAOZHUQINGXIEJIAOWEI15°,CAIYONGDONGMOTXINGCAODAOHUA,TXINGCAOYOUYABAN

                          123棋牌室21、NAIMOBAN7DENGLINGJIANZUHEXINGCHENG,CHICUNJINGDUGAO,JIAGONGWEIXIUFANGBIAN,TONGSHIZAIHUAKUAIZHONGXINZENGSHEDAOHUATIAO23,JIAQIANGCEXINGXINHUAKUAIDEDAOXIANGDINGWEI,YIBAOZHENGCECHOUXINJINGDU。YABAN、NAIMOBANJIDAOHUATIAOJUNCAIYONGCr12GANG,CUIHUOYINGDU(52±2)HRC。

                          123棋牌室3 MOJUCHENGXINGLINGJIANSHEJIZHIZAO

                                 定模镶件、动模镶件为模具主要成型零件,分别如图6、7所示,二者的分型面采用线切割加工。定模镶件上的型腔按图8所示电火花加工尺寸图加工。
                                 动模镶件的设计制造是模具设计制造的难点。首先是动模镶件与侧型芯滑块之间的配合关系需要妥善处理,二者采用U形滑配,即动模镶件与侧型芯滑块前部的两侧及中间部位分别形成锥面配合,以进一步保证侧型芯滑块的定位精度;其次是动模镶件上复杂易损部位宜采用小镶件结构,以利于加工和维修。图9为动模镶件图,图10为小镶件槽孔的线切割尺寸图,图11为小镶件外轮廓的线
                          切割尺寸图。

                          CEXINGXINHUAKUAIWEIZHENGTISHIJIEGOU,RUTU12SUOSHI。TU12(b)ZHONG7CHUKONGCAOXINGXINWEIXIANGJIANJIEGOU,YIBIANYUWEIXIU;CEXINGXINHUAKUAIDE3°、6°ZHUIMIANCHUYONGYUYUDONGMOXIANGJIANTIEHE;XIEDAOZHUKONGJINGWEIϕ14 mm,QINGXIEJIAOQU15°;DIMIAN69 mm× 12mm×5mmDEDAOHUACAOYONGYUYUDAOHUATIAO23PEIHE;18°XIEMIANSHANGKAISHEDE2CHUFANGCAOYONGYUANFANGXIEMIANNAIMOBAN4。

                          4 ZHUSHECHENGXINGGONGYIYAODIAN

                                  BIXUZHENDUIPA66BOXIANZENGQIANGSULIAODECHENGXINGGONGYITEXINGZHIDINGHELIDEZHUSHECHENGXINGGONGYI,BINGJINGDUOCISHIMOHOUYOUHUACHENGXINGGONGYICANSHU,ZHEIDUIBAOZHENGSUJIANCHENGXINGZHILIANGZHIGUANZHONGYAO。PA66SHUZHIJUYOUJIAODADEXISHIXING,ZAIZHUSHECHENGXINGQIANXUYAOJINXINGGANZAOCHULI,JICAIYONGWENDU(120±5)℃,SHIJIAN≥4hDEZHENKONGGANZAO,GANZAOXIAOGUOJIAOHAO,ERQIENENGYOUXIAOBIMIANYANGHUAXIANXIANG。

                          123棋牌室         PA66+33%BOLIXIANWEISULIAORONGHUAWENDUWEI275~280 ℃,JIAREWENDUBUYICHAOGUO300 ℃。SHENGCHANZHONGLIAOTONGQIANDUAN、ZHONGDUANJIHOUDUANWENDUFENBIEQU(293±5)℃、(288±5)℃HE(285±5)℃;PENZUIWENDUQU(265±5)℃;MOJUWENDUQU(118±5)℃,YOULIYUSUJIANHUODEJIAOGAODEJIEJINGDU,YOUHUALIXUEXINGNENG。CAIYONGSANDUANZHUSHEHEERDUANBAOYA,YALIYOUGAODAODI。

                          各注射成型工艺参数取值如下:
                                  (1)注射1段:压力(7.5±0.5)MPa,速度(75±5)mm/s;注射2 段:压力(3.0±0.5))MPa,速度(12±5)mm/s;注射3段:压力(2.0±0.5)MPa,速度(10±5)mm/s。
                                  (2)保压1段:压力(2.0±0.5)MPa,速度(12±5)mm/s;保压2段:压力(1.5±0.5)MPa,速度(10±5)mm/s。
                                  (3)冷却时间:(15±5)s。
                                  (4)注射周期:(30±5)s。塑件脱模后应立即进行调湿处理,将热塑件迅速置于95~100 ℃的热水中,时间为1 h,之后再自然冷却15~30min。这是尼龙塑件必须进行的后处理工序,使塑件在短时间吸水饱和,以提高塑件的尺寸稳定性,消除塑件内应力,防止塑件脆性断裂,同时使塑件与空气隔离,避免高温氧化。

                          华利胶木手轮

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