Why are 100,000 plastic mold designs?
Time：2023-04-27 11:20:52 / Popularity： / Source：
ABS: 0.5% (super non-shredding glue)
pc: 0.5% (bulletproof glass glue)
PMMa: 0.5%: (plexiglass)
PE: 2% polyethylene
PS: 0.5% (polystyrene)
pp: 2% (100% soft glue)
PA: 2% (nylon)
PVC: 2% (polyvinyl chloride)
POM: 2% (plug steel)
ABS+PC: 0.4%
PC+ABS: 0.5%
Engineering Materials: ABS PC PE POM PMMA PP PPO PS PET
02 How many systems are molds divided into?
Pouring → Ejection → Cooling → Forming → Exhaust
03 What problems should be paid attention to in process of mold design?
(1) Wall thickness should be as uniform as possible, and demolding slope should be large enough.
(2) Transition part is gradual, smooth transition, and avoid sharp corners.
(3) Gate. Runner should be as wide and stubby as possible, gate position should be set according to shrinkage and condensation process, and a cold well should be added if necessary.
(4) Surface of mold is smooth and roughness is low (preferably lower than 0.8)
(5) Exhaust holes and grooves must be sufficient to discharge air and gas in melt in time.
(6) Except for PET, wall thickness should not be too thin, generally not less than 1mm.
04 Common defects in plastic parts?
Lack of glue → cape → bubbles → shrinkage → weld lines → black spots → streaks → warping → delamination → peeling
05 Commonly used plastic mold steel?
45# S50c 718 738 718H
738H P20 2316 8407 H13
NAK80 NAK55 S136 S136H SKD61
06 What kind of material is used for high mirror polishing?
Commonly used high-hardness heat-treated steel, such as: SKD61, 8407, S136
07 What are structures of mold base?
Panel → board A→ board B→ square iron → guide column → thimble plate → thimble fixing plate → bottom plate
08 What are basic forms of parting surfaces?
Straight→Inclined→Surface→Vertical→Arc
09 How to hide each other in UG?
ctrL+B or ctrL+shift+B
10 What are mold processing machinery and equipment?
Computer gong → lathe → milling machine → grinding machine → drilling machine
11 What is 2D and what is 3D?
English of D is: prefix of Dimension (linearity, dimension), 2D refers to two-dimensional plane, 3D refers to three-dimensional space, in mold part, 2D usually refers to plan view or CAD drawing, and 3D usually refers to three-dimensional view.
12 What is default precision of pro/e? What is default precision of UG?
Default precision of pro/e is: 0.0012MM, and default precision of UG is: 0.0254MM.
13 Top four companies in global mold base production?
Germany: HASCO Japan: FUTABA (Futaba) USA: DME China: LKM (Long Kee)
14 What is default font height for CAD?
CAD default word height is: 2.5MM.
15 What is touch-through and what is penetration?
Mating surface of male and female molds that is parallel to PL surface is called touch-through surface, mating surface of male and female molds that is not parallel to PL surface is called insertion surface.
Both strip and wire are units of length, strip is Taiwanese, 1 strip = 0.01MM, and wire is Hong Kong language, 1 wire = 0.01MM, so 1 strip = 1 wire.
17 What is a pillow seat?
There are often notches on the edge of shell-like plastic parts, which are used to install various accessories. Pillow-shaped part formed here is called pillow position.
18 What is a crater?
Type of plastic-reduced part at the root of BOOS pillar reflected on mold is called mold crater after eruption of volcano.
19 What is O?
O refers to Core, a Hong Kong idiom.
20 What is a tiger's mouth?
Tiger mouth is also known as: pipe position, that is, part used to limit position.
21 What is layout?
Product layout on mold is called layout.
22 What is a glue position?
Cavity of product on mold is called: glue position.
23 What is a bone position?
Tendons on product are called: bone positions
24 What is a column?
Column of BOSS on product is called: column position.
25 What is a virtual position?
Gap on mold is called: virtual position.
26 What is a deduction?
Hooks used for connection on product are called: buckles.
27 What is a fire pattern?
Pattern left after EDM is called fire pattern.
28 What PL face?
PL surface, also known as parting surface and snap surface, refers to part where front mold and back mold are in contact when mold is closed.
29 What is a CNC?
CNC Mills and Machining Centers
30 What is a copper electrode?
EDM usually uses easy-to-process copper material as discharge electrode, which is called copper work, also known as electrode.
31 How much is spark bit usually?
During discharge process, discharge gap between copper worker and steel material is called spark position. Rough worker sparks are generally 10 to 50, and young worker's spark position is generally 5 to 15.
32 What is material level?
Avoid thickness of plastic products, also known as thickness.
33 What is original?
Original body retention is relative to cutting inserts, original body retention refers to a whole piece of steel for processing blanks, which is processed together during processing.
34 What is a weld line?
Line formed by meeting of two strands of plastic is called a weld line.
35 What is a jet stream?
After plastic enters cavity from plastic inlet, it forms a curved, folded, snake-like flow mark called a jet.
36 What does LKM mean?
LKM refers to Longji mold base. Commonly used mold bases are: LKM, Fudeba, Mingli, Huansheng, Changhui, and Desheng.
37 What does DME mean and what does HASCO mean?
Both DME and LKM are standard parts, DME is American, and HASCO is European.
38 What is a undercut?
Part where front and rear molds of product cannot be directly demolded becomes an undercut.
39 What is foolproof?
Fool-proof is an idiom, which is to prevent a very simple mistake and prevent a daze! For example: an insert has a hanging platform of same size on the side of sky and earth. During on-site assembly, it is very likely that side of heaven and the earth will be installed upside down, but he will make hanging platform on the side of insert. If you can't put it in, it's impossible to pretend to be wrong. This kind of action to prevent errors from appearing in a daze becomes a daze.
40 What is a injection machine?
Injection machine is a local idiom, that is, we often say injection molding machine, molding machine.
41 What is stop ?
Stop is clip art line, also known as cover-up line.
42 What is a flying mold?
Flying mold is matching mold or standard mold.
43 What is a light knife?
Action of CNC finishing is called light knife, that is, it is processed in place on basis of roughing.
44 What is open frame?
Action of processing mold core position on mold base is called frame opening.
45 What is word texturing?
Posted characters are processed fonts that are placed on the film and then used to add fonts.
46 What is opposite?
Method of inverting material level of front and rear molds under normal conditions to open mold is called reverse.
Ejection method in which small inserts are used to pop out places where there is an upside down is called floating.
48 What is pre-eat mold?
When mold is opened, product is left in front mold, which is called eating front mold.
49 What is top white?
Mold force required for ejection is large, and ejector pin is not strong enough, so that product is partially ejected. From front of product, there is an obvious white top white, also known as top high nozzle.
50 What is Baking Printing?
Marks left by water entry point on the surface of control point during diving are called baking marks.
51 What is a code boy?
Code is a clamping tool, a cushion block with a triangular inclined surface opening slot.
52. What is overcut?
Overcutting refers to overcutting, that is, when machining workpiece, parts that do not need to be machined are also machined, and overcutting is not good.
53 What is school cup?
Front mold pops out of mold opening position.
54 What is toothpaste?
Tapping. Tapping is called a click.
55 When do two-color molds need to be made?
When a product contains two different materials or different colors of same material, design a two-color mold for molding.
56 What is mold design process in factory?
Customer provides product drawing→Analyze product→Confirm plastic type→Confirm mold material→Transfer engineering drawing→Make mirror image by shrinking→Perfect assembly drawing→Order mold base→Order mold core material→Draft mold→3D parting→Determine runner /Gate method→Structural design with reference to layout drawing→Remove inserts→Correction 3D→Engineering drawing "including: mold core/inserts/mold base/parts"→Make BOM table→Proofreading and auditing
57 How many ways are there for demolding?
Smooth and strong
58 What are ways of feeding glue?
Direct glue feeding → lap glue feeding → side glue → ring travel glue → sheet glue feeding → latent type → point glue feeding → horn type glue feeding → fan-shaped glue feeding.
59 What types of runners are there?
There are circular runners → semi-circular runners → T-shaped runners → regular hexagonal runners.
60 Standing manuals and books for mold designers?
Steel books, plastic books, mold standard parts books.
61. What is function of spring?
Rebound when applied externally
62 Why should mold be drafted?
Prevent product from being pulled when demoulding.
63 Function of screw and determination of matching length?
It mainly plays role of tightening and fixing, and matching length is generally 1.5 to 2 times diameter of screw.
64 How big is slope of slider and how big is slope of inclined guide column?
Slope of slider is generally taken as 20 degrees, and slope of inclined guide column is generally taken as 18 degrees.
65 Role of cold wells?
Function of cold material well is to store a small part of plastic material with a relatively low temperature that first enters mold.
66 Role of positioning ring?
Function of positioning ring is to ensure correct relative position between mold and injection machine.
67 Relative position of mate?
There are three main types of fit: clearance fit, transition fit, and interference fit.
68 What is function of inserts?
It is convenient for processing, prevents carbon deposition, facilitates polishing, saves materials, helps exhaust, facilitates replacement, and reduces processing machines.
69 What are indicators of hardness?
Hardness indicates ability of a material to resist pressing of a hard object into its surface. Commonly used hardness indicators are Brinell hardness, Rockwell hardness and Vickers hardness.
70 Can surface be drafted? Can group be drafted? Can quilt be replaced?
Surfaces cannot be drafted, quilts can be drafted, and quilts can be replaced.
①. Where object is placed in the first quadrant, drawing method of projecting view in relationship of {viewpoint} (observer) → (object) → (projection surface) is called the first angle method, also known as first quadrant Law.
2. Drawing method of placing object in third quadrant and projecting view in relationship of {viewpoint} (observer) → (projection surface) → (object) is called third angle method, also known as third quadrant method. .
Note: Difference between the first angle drawing method and third angle drawing method is article of view placement.
First corner drawing method: left view is placed on the right, right view is placed on the left, top view is placed on bottom, and so on...
Third angle drawing method: left view is placed on the left, right view is placed on the right, upper view is placed on the top, and so on...
72 How many ways are there to transport water?
Commonly used water transportation are: straight-through, wrap-around, water tower, and spiral.
73 What are basic principles of three views?
Basic principles of three views are: length is aligned, height is flush, and width is equal.
74 What are types of injection machines?
According to shape: vertical, horizontal, according to injection volume is divided into: ultra-small injection molding machine, small injection molding machine, medium injection molding machine, large injection molding machine, super large injection molding machine. That is, injection volume ranges from a few milligrams to dozens of kilograms, and is divided into: several tons to several thousand tons according to clamping force.
75 What is relationship between clamping force and clamping force?
Clamping force of injection molding machine should be greater than clamping force, otherwise mold will be opened by the pressure in the mold.
76 What are positioning methods of male and female molds?
There are two types of positioning methods for front and rear molds: one is: mold plate positioning, and the other is: mold core positioning.
77. What is appropriate wall thickness of commonly used plastics?
Suitable wall thickness of ABS is: 1.8-3mm, suitable wall thickness of PC is: 2-3.5mm, suitable wall thickness of POM is: 1.5-2.5mm, and suitable wall thickness of NoryL is: 2-3.5mm
78 What is an overflow value?
Overflow value refers to a value under which the plastic product will overflow (that is, the burr),
Overflow value of ABS is: 0.04mm,
Overflow value of pc is: 0.06mm,
Overflow value of pA is: 0.015mm,
Suitable wall thickness of POM is: 0.04mm,
Overflow value of PBT+15%GR is: 0.03mm,
Overflow value of PBT+30% is: 002mm,
Overflow value of PMMA is: 0.065mm,
Overflow value of PVC is: 0.07mm,
Overflow value of AS is: 0.05mm,
Overflow value of ps is: 0.05mm,
Overflow value of pp is: 0.03mm,
Overflow value of PE is: 0.02mm.
79 What is standard frame size?
Commonly used frames are: A0, A1, A2, A3, A4, size of frame of A0 is: 1189mx841m, size of frame of A1 is: 841mx594mm, size of frame of A2 is: 594mmx420mm, size of frame of A3 is: 594mmx420mm, size of frame of A3 is: Size is: 420mmx297mm, size of A4 frame is: 297mmx210mm.
80 Mold size planning?
Each company has different standards for planning size of molds, but common standards are divided as follows: 15-30 series molds are classified as small molds, 30-50 series molds are classified as medium molds, more than 50 series mold are classified as large molds.
81 What is elastic deformation? What is plastic deformation?
Object deforms under action of external force. When external force disappears, object can return to deformation before deformation, which is called elastic deformation. When external force disappears, object cannot return to deformation before deformation, which is called plastic deformation.
Mold base is commonly used in trump card steel (called in Hong Kong), and trump card is medium carbon steel and 45 steel.
83 What is difference between model space and layout space in CAD drawing work?
Model space is for drawing entities, and layout space is for drawing layouts.
84 What is function of water transport?
Function of water transport is to control temperature of mold core.
85 What is a mold?
In industrial production, various presses and special tools installed on press are used to make metal or non-metallic materials into parts or products of desired shape through pressure. Such special tools are collectively referred to as molds.
86 Classification of molds?
Molds can generally be divided into plastic molds and non-plastic molds. Non-plastic molds include: casting molds, forging molds, stamping molds, die-casting molds, and plastic molds. , Compression molding mold, transfer molding mold, extrusion molding mold, thermoforming mold, rotary molding mold, according to different types of gating systems, the molds can be divided into three categories: large nozzle mold, narrow nozzle mold, hot runner mold.
87 What is a gating system?
Plastic flow channel from injection nozzle to cavity is called gating system. Gating system includes: main runner, runner, gate and cold well.
88 What is reverse engineering?
Reverse engineering is accurate and high-speed scanning of existing samples or models by a high-speed 3D laser scanner to obtain its 3D contour data, coordinate with reverse software to reconstruct curved direction, conduct online precision analysis on reconstructed surface, evaluate structural effect, finally generate IGES or STL data, which can be used for rapid prototyping or CNC machining.
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