推荐回答(2个)
模具安装、拆卸:
模具的安装和拆卸是一名冲压工一项非常关键的技能,它基本上用到了压力机所有的操作:装模高度调整、微调、工作台夹紧与放松、工作台开出等。从模具的角度看,在模具安装和拆卸的过程中很容易出现工装事故,容易对模具产生致命的伤害,另外装模调整的合理性对模具使用寿命、稳定性及冲压件的质量都有着非常直接的关系。还有从生产的角度看,熟练掌握装卸模具的工作要领有利于缩短换模时间,从而提高劳动生产率。以下就是模具安装和拆卸的程序以及注意事项进行叙述和说明:
A、单动模具安装:
1.工作台开出并清擦干净:
开出前清擦工作台导轨,将废料等杂物清理干净,检查模具台两侧是否有物品超宽,以防止工作台开出时与压机主柱相干涉,引发事故。工作台所停的位置要合理,以方吊模和放模为标准,但要与导轨的挡块留一定的安全距离;
2.单动拉延模根据《作业指导书》把顶杆装好并确保顶杆长度一致:
根据《作业指导书》上的顶杆图选用顶杆和顶杆位置,放好顶杆后要进行检查,保证顶杆的位置和长度的一致性,为了使模具摆放位置准确,根据《作业指导书》在模具相应的位置上放置定位销。另外顶杆孔的盖板要定置摆放,以防丢失;
3.模具吊上工作台并将中心与压机的工作台中心对齐:
模具放置前要将模具的底面及上表面清擦干净,模具放好后检查各安装槽与压机T形槽的对齐情况,以方便安装;
4.工作台开进并夹紧:
工作台开进前对压力机底座进行清擦,工作台开进时一定要开到位后方可落下和夹紧;
5.调好模具的安装高度(模具的安装高度=模具存放高度+10cm);
6.单动拉延模在离模具上表面20-30cm处试顶杆,顶杆正确后将气垫落下;
7.将滑块开至滑块底面与模具上表面触后,将上模螺钉装上并锁紧,下模螺钉放上即可,切记不要锁紧;
8.滑块开到上死点,将留模样件取出,取下存放限置器;
9.对模具进行清擦润滑;
10.精调装模高度,滑块空行程两次后将模具合上,锁紧下模螺钉(空行程时注意模具各部份的工作情况是否正常,如有异常及时通知模修工);
11.单动拉延模要调整好气垫压力值;
12.首件调试合格后投入生产,填写《模具日点检表》和《自检记录表》。
B、双动模具安装:
1.工作台开进与夹紧的步骤与单动模具相同;
2.调整好模具的安装高度。(双动模的安装高度是在模具的装模高度的基础上加上调整值,调整值一般在0.5-2.5之间);
3.将滑块开到下死点(注意液压垫压力表的表值),将内外滑块夹紧器放松,并检查放松情况,待确认放松后用微调点动将滑块开到上死点。由于操作人员无法看见内滑块内部的情况,故在滑块下行时一定要有专人看内滑块压力表的表值,当指针有动时,说明内滑块与模具已经接触,如果此时不在下死点,就应向上调整装模高度。注:滑块夹紧器放松后,操作人员一定要逐个检查夹紧器的放松情况,以保证工作安全;
4.安装螺钉,锁紧上模螺钉后将滑块开到下死点;
5.将内外滑块夹紧后把滑块开到上死点,对模具进行清擦和润滑;
6.滑块空行程二次后用微调将模具合上,锁紧下模。空行程过程中模具的凸、凹模之间不应墩死,以保护模具型面不受损害;
7.首件调试合格填写《工装日点检表》和《自检记录表》。
C、单动模具卸下:
1.认真检查模具各部位是否完好、废料是否清除干净,并将模具各部位清擦干净;
2.存放限置器放上,合模(使存放限置器轻微受力变形,若是刚性存放限置器则在快接触时使用装模高度调整)后将上下模具螺钉卸下;
3.将滑块开到上死点后,工作台放松并开出;
4.模具吊至存放地,清理工作台。
D、双动模具卸下:
1.认真检查模具各部位并清擦干净,零件归位;
2.将装模高度调整到模具的安装高度后将滑块开到下死点;安装高度为模具安装放松垫板时压机的装模高度;
3.将内外滑块放松后滑块开至上死点,卸下安装螺钉。夹紧器放松后一定要逐个对夹紧器进行检查;
4.滑块开到下死点后将内外滑块夹紧。夹紧器夹紧后一定要逐个对夹紧器进行检查;
5.滑块开到上死点,将工作台放松并开出;
6.模具吊至存放地,并清擦工作台面;
7.模具吊回存放地点,用塑料布盖在模具上表面上。
E、模具的联合安装:
联合安装指的是在一个工作台面上,同时安装两个或两个以上的模具进行生产。其优点有:提高设备的使用率、生产效率高、制造成本低等;但其存在装卸不方便,模具制造要求高,另外生产的安全性下降等缺点。
模具联合安装的条件:①模具的闭合高度要求必须等高;②联合安装后冲压力的中心必须与压机的压力中心重合;③生产中操作必须方便。
1\冲裁力P=1.3XL周长Xt料厚X剪切强度
冲裁力=1.3X4X30X1.6(料厚)X剪切强度440=109824牛=11吨。按16T选用。
2、设备不仅要看吨位,还要看台面大小。
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