Could I ask you some questions if you are free?/ Are you free now? May I ask you some questions (a question)?
Can you tell me whether the surface of this part is a visible/esthetic one? What will we do for its surface? Texture or Polishing?
Does this part need an ejector pin or an ejector bar? Can we add an ejector blade?
Can we add ejector sleeves or ejector pins in the boss of this part?
There’s an undercut at this position and it needs a slider. It will also have a parting line on this side, is that OK?
We will make the lifter and (inner) slider in this position, will that be a problem?
The 2D and 3D drawing you provided is not the same, can you tell me which one is correct?
There is no draft angle in the 3D drawing, some materials are too thick, and some place are too thin. Can we modify this part by ourselves? We will send the drawing to you for you to check after we modify it.
Accoring to the shrinkage one over two hundred, the mold has been done in the right
dimension, but the part falls short to your part drawing, are you sure the shrinkage is right?
This position is too small and will make the steel material here too thin, can we widen it here?
The angular lifter interferes with the boss during ejection. Please consider changing the position of the boss.
The rib here is too thin and on the high side, so it will be difficult to fill here when we do the injection, can you inrcease the thickness of this rib?
Will you increase/decrease the material on this rib? We will use EDM if you add material, but there are two option if you choose to decrease:1.Make inserts;2.Welding, because there is water in the bottom of the insert, is that OK?
This sample has been burned in the bottom because the venting is not good, we can add an insert in the middle of the rib.
It will take about 5 or 6 days to redo the insert, is that OK?
We have made the texture on this side, if we add material, it will take some days to remake the texture by out-resourcing, so we suggest using the texture by EDM instead, is that OK?
Is this mold dimension measured in inches or meters? Does it need spare parts?
Will you provide the engraving content of the plate of this mold to us? When will you send it?
Can you provide the type of injection machine and other related information of this mold to us? Such as the boss dimension, the hole’s dimension of the ejector pin and the size of the injection machine and so on.
I need to discuss this problem with the other colleagues and then I will reply back to you.
We will try our best to complete your plan, if there are any complications, we will notify you immediately.
The length of this part is 330.12MM, Width is 78.96MM, height is 45MM, thickness is 2MM, weight is 70.63g, the injection machine is 250T,the material is black, the outside of the part has texture, inner side needs polishing, and it also needs a date and recycle stamp,the core&cavity is 2344 nitridng, the lifter and slider shelf is 728H. Please check the information above!”
It is time to have lunch, let’s discuss this project later this afternoon?
The undercut area interferes with the slide block and needs to be filled with material to help the slider move smoothly.
The thickness added is too thick.
The thickening area is too wide.
The gate position is moved.
The split line of slide block or the area of slide.
It is hard to fill this area due to the sharp feature.
The strength of this area is too weak and it is hard to cool because the steel is too thin.
We avoid designing the semicircle of the cylinder on the slide block because it will be pulled apart or cause drag marks.
The part will be damaged if we make the lifter in this area.
This is a critical surface where we cannot add additional material.
Because of the shrinkage of the thickness, we suggest reducing some wall thickness to improve it.
Please confirm whether it is a critical surface or not. Also, confirm whether it is acceptable to have a slide split line if we have a slide in this area.
Please confirm whether we can reduce material to the area where we have an undercut as indicated to have shut off on cavity side. No slide block and lifter will be made.
Please confirm the issues of Parting line, Gate position…etc. as soon as possible; otherwise, the lead-time will be extended.
Please confirm whether it is a critical surface or not and if we can have E.J. pin marks on it.
There are sharp edges if we set the parting line here, It will reduce the tool life
We suggest enlarging the draft angle to help release the tool.
41. GATE做在此处的话有两个缺点：1.盖子打开时可以看到GATE的修剪部位; 2.两个斜销在同一侧，顶出也不是很平衡.
There are two problems if the gate is to be designed in this area:
a). It is easy to see the gate mark when you open the cap.
b). The ejectors are unbalanced when two lifters are on the same side
The gate mark is not visible if the gate position is designed like this.
If you insist that the gate position has to be like the original design, then we would further recommend to have it to the area indicated so it can avoid a shrink problem in this area.
If the design of the gate has to be a sub. Gate, then the back surface of the part will have serious flow marks due to the black colour.
There is possible sticking on cavity; therefore, please confirm whether it can make undercuts, snatch pins or leave coarse E.D.M. on the core to snatch the part on.
Please confirm whether it is acceptable to have stress lines on the surface because the thickness is not equal.
Please advise where the critical surface is. Please also provide us a 2D drawing with critical dimensions.
Please note the red highlights because those areas have problems.
We would suggest using the attached part design as the current design has problems.
We suggest modifying it as a globe recess.
Half of the cylinder features can not be removed in the slider, in case of tension
The inside small slide block will recede first and the parent slide block have to postpone sliding.
The slide pins will use an oil cylinder to assure that the process is in proper order.
We cannot add material to this surface because it will intervene between the two parts when it is assembled. Please see the sketch attached.
To descend the surface of lifter in order to thicken the part.
One half side will have the lifter and the other half will be solid/nature.
These two bosses are overlapping with undercut therefore it can not be made as solid. We
suggest making it with a slide block.
This area needs force ejection.
Here will be a double ejection for forward and receding.
Please confirm whether it is acceptable that there will be a split line here.
Please confirm whether it is ok to have mismatch to the area where there is 1 degree of shut off in Core / Cavity side.
Please confirm whether we can enlarge this dimension.
It will affect the elastic of the film better if we add a recess. See how it will affect the assembly parts, and then make your decision.
There is an undercut here, we suggest cutting out the indicated part as it highlighted to avoid an undercut.
65. 成型后SUB GATE要修平
The gate (sub gate) needs to be trimmed evenly after being moulded.
This area of the undercut needs to be ejected vertically, then taken out manually.
The gate is not suitable in this area becuase there are two sliding blocks sealing off this area.
We would suggest placing a runner shut-off insert to adjust the volume of part filling.
This undercut will be force ejected out, Please confirm whether it can be reduced to 0.6 mm.)
This boss is not releasable. Please check the file again and if possible, pleas re-send us the original draft.
This boss will shrink because it is a solid boss.
Please confirm whether this surface needs to be textured or not. Please advise texture specs. Also, what’s the min. draft.
Please confirm whether this surface needs to be polished and stuck on a sticker.
The red highlighted area has a problem of a small draft angle. We suggest enlarging the
draft to avoid casuing drag marks on the part.
This rib can not be filled properly because it is too thin.
This rib will have a shrink problem because it is too thick.
There are problems with this current design, we recommend doing this undercut as an alternative but there will be additional costs.
The base of all bosses require a crater to avoid shrinkage.
The surface of KO insert shound below bottom plate 0.5mm,thread M20.
RP,EGP should have 0.5mm gap with the moldbase.
Venting slot distance from the seal off position 10-15mm
82.运水进用 E,，运水出用 S ；
Top/Bottom plate must have insulator plate,DME standard 1/4’H
Eyebolt should on the center of the mold(for balance)
The eyebolt position on the cavity/core side should on the center of gravity for balance
Plug use NPT spec.
Use HASCO ball EGP
Jiffy Use French Standard: 1/4″ mark:RPL08-1151