1, commonly used plastic materials and shrinkage rate?
ABS: 0.5%
pc: 0.5% (bullet-proof glass plastic)
PMMa: 0.5%: (plexiglass)
pe: 2% polyethylene
PS: 0.5% (polystyrene)
pp: 2% (100% soft)
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
2, the mold is divided into several major systems?
Pouring → ejection → cooling → molding → exhaust
3, in the mold design process should pay attention to what issues?
(1) wall thickness as uniform as possible, stripping draft should be large enough.
(2) the transition part of the gradual, sleek transition to prevent sharp corners.
(3) Gating The runner should be as large and thick as possible, and the gate position should be set according to the process of shrinkage and condensation. If necessary, cold material wells should be added.
(4) mold surface smooth, low roughness (preferably low 0.8)
(5) vents, slots must be sufficient to timely discharge air and melt gas.
(6) In addition to PET, the wall thickness is not too thin, generally not less than 1mm.
4, plastic parts often appear flaws?
Lack of plastic → cloak → bubble → shrink → weld marks → black spots → stripes → tilt → stratification → peeling
5, commonly used plastic mold steel?
45 # S50c 718 738 718H
738H P20 2316 8407 H13
NAK80 NAK55 S136 S136H SKD61
6, high mirror polishing with what kind of platform?
Commonly used high hardness heat treatment of steel, for example: SKD61, 8407, S136
7, mold structure that have those?
Panel → A plate → B plate → square iron → guide column → thimble plate → thimble fixing plate → base plate
8, the basic form of sub-surface what?
Straight → Tilt → Surface → Vertical → Arc
9, how to hide each other in UG?
ctrL + B or ctrL + shift + B
10, mold processing machinery and equipment which?
Computer gong → lathe → milling machine → grinder → drilling machine
What is 2D, what is 3D?
D is in English: Dimension, 2D refers to the two-dimensional plane, 3D refers to the three-dimensional space, in the mold part, 2D usually refers to the plan that CAD drawings, 3D usually refers to the three-dimensional map.
What is the default precision of pro / e? What is the default precision of UG?
pro / e default accuracy: 0.0012MM, UG default accuracy: 0.0254MM.
13, the world's top four mold-making enterprises?
Germany: HASCO Japan: FUTABA (Futaba) USA: DME China: LKM (Dragon Kee)
14, CAD default word height is how much?
CAD default word height is: 2.5MM.
15, what is touched, what is inserted?
The male and female mold mating surfaces parallel to the PL surface are called contact surfaces, and the male and female mold mating surfaces that are not parallel to the PL surface are called facets.
16, the relationship between the wire and
Article and silk are length units, the phrase for Taiwan, 1 = 0.01MM, silk for the Hong Kong language, a silk = 0.01MM, so a = 1 silk.
17, what is the pillow?
Shell plastic parts often open the edge of the gap for the installation of various accessories, where the pillow-like part of the formation known as the pillow position.
What is the crater?
BOOS column root part of the plastic reduction reflected in the type of mold after the volcano eruption shape is called the mold crater.
What do you mean?
Oh refers to the mold kernel, Hong Kong idioms.
20, what is the tiger's mouth?
The tiger's mouth, also known as: pipe position, that is used to limit the part.
21, what is the ranking?
The product layout on the mold is called a rank.
22, what is gum position?
Cavity of the product on the mold is called: glue position.
23, what is the bone?
Products on the ribs called: bone position
24, what is the column?
BOSS product on the column called: column position.
25, what is the virtual position?
The gap on the mold is called: dummy bit.
26, what is buckle position?
The hooks on the product are called: Buckle.
27, what is the spark pattern?
The pattern left after EDM is called spark pattern.
28, what PL surface?
PL surface, also known as: sub-type surface, snap-pull surface, refers to the mold in the closure of the front and rear mold contact mode.
29, what is the computer gong?
CNC milling machines and machining centers
30, copper is what?
Electric spark is usually made of copper electrode easy to process to do discharge electrode, called copper, also known as electrode, copper is generally divided into: rough, rough young workers, young workers, young workers, also known as Seiko.
31, the spark is usually how much?
Discharge process, the discharge gap between the copper and steel known as the spark bits, rough sparks generally 10 to 50, the sparks of young workers are generally 5 to 15 (Welcome attention WeChat: automotive technologist).
32, the material level is what?
Plastic products to avoid thick, also known as meat thick.
33, what is the original stay?
The original stay is relative to cut inserts, the original stay is a piece of steel for the processing of billets, processed together processed.
34, weld marks what?
The formation of two plastic lines formed by the line known as welding marks.
35, jet is what?
Into the plastic into the plastic from the plastic into the cavity after the formation of bending like snake flow marks known as jet.
36, LKM refers to what?
LKM refers to the Dragon Kee embryo, commonly used mold embryos are: LKM, Fulbright, Minli, Central, Chang Hui, Desheng.
37, what is DME, what is HASCO?
Both DME and LKM are standard parts, DME is American, and HASCO is European.
38, what is the back button?
Before and after the mold can not be directly part of the demolition into the buckle.
39, what is foolproof?
Foolproof is a idiom, is to prevent a very simple error, to prevent trance! For example: an insert in the world have done the same size hanging table, the scene assembly is likely to put the world side anti , But he is hanging on the side of the insert, at this time, if heaven and earth side anti-fitted outfit does not go in, want to install the wrong impossible, this to prevent daze and error-making action becomes a daze.
40, what is beer machine?
Beer machine is a local idiom, that is, we often say that the injection molding machine, molding machine.
41, what is the stop?
Just mouth is clip mouth art line, also known as cover ugly line.
42, what is the flying mold?
Flying mold is the model or die.
43, what is the knife?
CNC finishing action known as the knife, which is rough in place on the basis of processing.
44, what is open box?
Die in the mold processing mold put Jen position action called open box.
45, what is the sun word?
The sun is the word on the film and then add fonts processing font.
46, what is the opposite?
Under normal circumstances, before and after the mold bits upside down to open the mold called anti-Oh.
47, what is floating?
Where there is a local buckle with a small insert ejection method known as floating Oh.
48, what is the former model?
When the mold is opened, the product remains in the front mold and is called the front mold.
49, what is white top?
When ejection, the required mold force is large, and the thimble is not enough to make the product partially wrecked. From the front of the product, there is obvious white for the top white, also called the top high water outlet.
50, what is the printing?
Dive into the water point in the point of appearance of the surface traces left as baking.
51, what is the code?
Yards Aberdeen belongs to the clamping tool, a triangular bevel open slot groove pad.
52, what is cut?
Overshoot refers to over-cutting, that is, the processing of the workpiece does not need to be processed part of the processing, over-cutting is not good.
53, school cup is what?
Former model pop-up mold inner space.
54, what is the click?
Tapping tapping thread is called clatter.
55, when to do two-color mold?
When a product contains two different materials or the same material of different colors, the design of two-color mold forming.
56, the factory mold design process is what?
Customers to provide product drawings → analysis of products → Confirm plastic varieties → confirm the material of the mold → turn the picture → take a picture of the shrinking water → improve the set of drawings → set the embryo → set mold material → draft → 3D parting → determine the runner / Gate way → Refer to the ranking chart for structural design → disassembly pieces → correct 3D → project plans "including: Dieren / inserts / mold embryo / parts" → BOM → proofreading review
57, stripping several ways?
Shun off and strong off
58, into the plastic which way?
Directly into the plastic → lap into the plastic → side glue → loop into the plastic → sheet into the plastic → latent → point into the plastic → horn into the plastic → fan into the plastic.
59, those forms of runners?
A circular flow path → semicircular flow path → T-shaped flow channel → hexagonal flow channel.
60, mold designers standing manuals and books?
Steel books, plastic books, mold standard books.
61, the role of the spring is what?
Rebound occurs when external appears
62, mold why the draft?
Prevent products from being pulled when stripping.
63, the role of screws and with the length of the determination?
Mainly from the tight fastening role, with the general length of the screw to take 1.5 to 2 times the diameter.
64, the slider generally take much of the slope, the angle of the inclined guide column generally take much?
The slope of the slider generally take: 20 degrees, the angle of the inclined guide column generally take 18 degrees.
65, cold well role?
The purpose of the cold well is to store the small portion of the plastic material that enters the mold earlier than the temperature.
66, the role of positioning ring?
The role of the positioning ring is: to ensure that the mold and the injection machine to maintain the correct relative position.
67, with the relative position?
With the main divided into three categories: clearance fit, transition fit, interference fit.
68, What is the role of inserts?
Easy processing, to prevent carbon deposition, which will help polishing, material saving, exhaust help, easy to replace, reduce processing machine.
69, there are several indicators of hardness?
Hardness means that the material is resistant to the ability of a hard object to be pressed into its surface. Brinell hardness, Rockwell hardness and Vickers hardness are commonly used indexes of hardness.
70, the surface can be drafted? Whether the group can pull the surface group can replace?
Surface can not draft, the surface can be drafted, quilt can be replaced.
71, the first angle and the third angle difference?
①, where objects will be placed within the first quadrant to {view point (observer) → (object) → (projection surface) projection relationship between the view of the painting method, known as the first angle method, also known as the first quadrant law.
②, where objects will be placed in the third quadrant to {view point (observer) → (projection plane) → (object) and projection view of the painting method, known as the third angle method, also known as the third quadrant method .
Note: The difference between the first corner and the third corner is the article placed in the view.
The first corner of the painting: the left view on the right, put the right view on the left, put down the top view, and so on ...
The third angle painting: Left view on the left, right view on the right, put on the top view, and so on ...
72, there are several ways to transport water?
Commonly used water transport: straight-through, wraparound, water tower, spiral.
73, the three basic principles of what is?
The basic principles of the three views are: long alignment, high flush, equal width.
74, injection machine divided into those categories?
According to the shape points: vertical, horizontal, according to the amount of injection is divided into: ultra-small injection molding machine, small injection molding machine, medium injection molding machine, large injection molding machine, large injection molding machine. Injection volume is from a few milligram to dozens of Kilograms ranging, according to clamping force is divided into: a few tons to several thousand tons.
What is the relationship between clamping force and holding force?
The clamping force of the injection molding machine is greater than the mold clamping force, otherwise the mold will be mold pressure distraction.
76, male and female mode of positioning what?
There are two types of positioning before and after the mold: First, the template positioning, the second is: mold kernel positioning.
77, commonly used plastic wall thickness is appropriate?
ABS suitable wall thickness: 1.8-3mm, PC suitable wall thickness: 2-3.5mm, POM suitable wall thickness: 1.5-2.5mm, NoryL suitable wall thickness: 2-3.5mm
78, what is the overflow edge value?
Spillover value refers to how much plastic products will overflow, (that is, running flash) a value,
The overflow edge value of ABS is: 0.04mm,
pc overflow edge value is: 0.06mm,
The overflow edge of pA is: 0.015mm,
POM suitable wall thickness: 0.04mm,
PBT + 15% GR overflow edge value is: 0.03mm,
PBT + 30% of the overflow edge value is: 002mm,
The overflow margin value of PMMA is: 0.065mm,
PVC overflow edge value is: 0.07mm,
The AS overflow value is: 0.05mm,
The overflow value of ps is: 0.05mm,
pp spillover value is: 0.03mm,
PE overflow edge value is: 0.02mm.
79, the standard frame is much?
Common frame are: A0, A1, A2, A3, A4, A0 frame size is: 1189mx841m, A1 frame size is: 841mx594mm, A2 frame size: 594mmx420mm, A3 frame Size: 420mmx297mm, A4 frame size: 297mmx210mm
80, the size of the mold planning?
The standard for mold size is not the same for each company, but the common standards are divided as follows: the molds of 15-30 series molds are listed as small molds, the molds of 30-50 series mold molds are listed as medium molds, Embryo mold as a model.
81, What is elastic deformation? What is plastic deformation?
When the external force disappears, the object can be restored to the deformation before the deformation is called elastic deformation. When the external force disappears, the object can not be restored to the deformation before the deformation is called the plastic deformation.
82, mold embryo what material commonly used?
Die commonly used trump card steel (Hong Kong called France), the trump card is carbon steel, 45 steel.
83, CAD drawing work model space and layout space What is the difference?
Model space is the space for graphic entities and layout space is for drawing layouts.
84, what is the role of water?
The role of water transport is: control the temperature of mold kernels.
85, what is the mold?
In industrial production, with a variety of presses and special tools installed in the press, the pressure of metal or non-metallic materials made of the desired shape of the parts or products, the special tools collectively referred to as the mold.
86, mold classification?
Die can be divided into general plastic mold and non-plastic mold, non-plastic molds are: casting mold, forging mold, stamping die, die-casting mold, plastic mold according to the production process and production of different products are divided into: injection molding, blow mold , Compression molding, transfer molding, extrusion molding, thermoforming, rotary molding, mold casting system can be divided according to different types of molds into three categories: a large nozzle mold, a nozzle mold, hot runner mold.
87, what is pouring system?
The plastic flow path from the nozzle of the injection machine to the cavity is called the pouring system. The pouring system consists of the main channel, the runner, the gate and the cold well.
88, what is reverse engineering?
Reverse engineering is a high-speed three-dimensional laser scanner for the existing samples or models of accurate and high-speed scanning to obtain the three-dimensional contour data, with reverse software for the reconstruction of the curve, and reconstructed surface online accuracy analysis, evaluation Constructs the effect, produces IGES or STL data finally, according to the time can carry on rapid prototyping or the CNC numerical control processing.