1.like this kind of product,
because the locate easy to bend when
injected, so ,when you begin to design this mold, #301 component must be
length 0.10mm,after first trying mold, according the length of bending, o
repair or adjust the #301 component, one slide as datum no adjust, the other
slide also must be adjust.
in order to reduce the bend length ,you must care the
cooling, so you must design cooling hole in the #301
1.when you design this type of
plastics mold, parting line must be designed according the max silhouette
curves. because if you designed by manned line, which somewhere was be length
or shorted ,so that mold can be machined easier, this locate will easy be worn
and torn so production will be easy to occur overflow. outlook will not be
1.like this part, when you
discharge ,at first, you must roughly discharge this part at left and right
side, then semi-finish discharge this part from left and right side, at last
,finish discharge this part. if you discharge one side of this part from rough
to finish at same time, then discharge the other side, you will not get to
correctly result. being heating and no enough stiffness, making this part
1. when design the mold of plastic glass, the
circle runner is often used. (plastic material name pmma)
2. skh51 used in plastic mold as core or cavity
should be heated to 58 rather 61, because is cool-steel, when it is used at
heat environment, it can be cracked. however, when it is used as tip or pin can
be heat-treated to 61hrc.
3.s10c, s20c is regard as iron.
s45c, s55c is regard as steel.
4.spring steel or viking steel
can be used in special constitution, such as insert.
5.asp23 is a kind of good
material having the same direction in the atom.
6.some press mold need the
steel having the different direction in
the atom, but some press mold want the steel having the same direction in the
atom, because of the different condition.
7.skd11,skd61(sld is used on the
plastic mold side. nak55, nak80, nak101 have different performance in the
8.the heat steel has a bit lower
hardness than the cool steel which can reach the top performance of the
9.skh9 is high-speed steel which
is often used as mill tool and also is used as the high difficult plastic mold.
10.the manufacturing of plastic
gear often demands 5 times discharge. in japan there are two standard on the
gear, jis (japanese international standard) and jgma (japanese gear manufacture
association). some factory has the capacity of machining 45 degree lean gear or
0.2-0.25 module with 14-20 gear num by using charmiller or argi. when the gear
is finished, it need be measured by the special machine, such as osaka’s gear
11.generally, we can machine 2
grade gear, but it is hard for us to machine 3-4 grade gear.
12.a japanese plant designing and
machining a gear mold need about 25 days.
13.to new mold, the part need be
check once per two hours during the trial mold, however, the producing mold
normally was checked once per four hours.
14.if the gear is unqualified, we
can check it by using the gear measure machine which can print the gear curve
with measuring, and analyze the results, then adjust the gate size
corresponding the unreasonable position.
15.generally the plastic runner
material can be used three to five times after broken into pieces by a machine.
except the plastic material including glass, the other plastic material can be
mixed into the new material directly.
16. to wedm, the gap of rough electronic discharge
is about 0.02mm, however to finish
machining, the gap is 0.002mm or so.
17.to wedm, the corner of radius,
the point of wire entering the workpiece or outing the workpiece is very easily
to occur some error, so leading to the quality of surface isn’t very good.
18.to charmill wedm machining, the
maximum machining height is about 180mm.
19.to a general wedm machining,
the average capacity of machining is about 120-160mm2, that is the
rough machining is about 80mm2, the semi-finish machining and finish
20.because the flow is difficult,
the runner of pmma (polymethyl methacrylate) is set circle shape.
21.the removing gap slot of
plastic mold often set around the pruduct of core&cavity. the depth of
begin is 0.01-0.015mm , the length is about 1-2mm. the length is over 1-2mm,
the depth of gap can be set 0.5mm. but you must remember: only setting slots on
cavity&core is not rough. around the outside of cavity&core should have
a slot, 2mm depth, the plate of mold should have slots.
22.the tape isn’t necessary, if the relative height of insert or core
is least than 1mm. but the result isn’t absolute, you must analyze the product
and think about the demand of customer.
1.該模具加工的順序為: a. 凸點先不加工,平面咬花. b. 然后,檢測該平面的平面度,修模直到ok. c. 最后才加工所有的凸點,其中,部品上凸點的高度應比側面的兩條筋低處0.03-0.05mm,這一點應該在打合時向客戶提出. d. 再后, 拋光凸點, 拋光時應該在30-50倍的放大鏡下拋.(平時拋光也最好在5倍的放大鏡下拋),拋光前的機加工(用加工中心銑出,而不能用放電,以免凸點大小不均)余量應留0.03mm左右,供拋光.