The common knowledge in the design of 86 plastic molds is as follows:
1. What are the major systems for the mold?
Pouring → ejection → cooling → forming → exhausting.
2. Commonly used plastic engineering materials and shrinkage rate?
PVC: 2% (polyvinyl chloride)
ABS: 0.5% (super broken glue)
PC: 0.5% (bulletproof glass glue)
PE: 2% polyethylene
PS: 0.5% (polystyrene)
PP: 2% (100% soft rubber)
PA: 2% (nylon)
POM: 2% (Sai ​​Steel)
PMMA: 0.5%: (Plexiglas)
ABS+PC: 0.4%
PC+ABS: 0.5%
Engineering materials: ABS PC PE POM PMMA PP PPO PS PET.
3. What problems should I pay attention to during the mold design process?
(1) The wall thickness should be as uniform as possible, and the draft angle should be large enough.
(2) The transition part is gradually and smoothly transitioned to prevent sharp corners.
(3) Gate. The flow path should be as wide and thick as possible, and the gate position should be set according to the shrinkage condensation process. If necessary, a cold well should be added.
(4) The surface of the mold is smooth and the roughness is low (preferably 0.8)
(5) The venting holes, the slots must be sufficient to expel the air and the gases in the melt.
(6) Except for PET, the wall thickness should not be too thin, generally not less than 1mm.
4. What are the common occurrences of plastic parts?
Lack of glue → cloak → bubble → shrinkage → weld mark → black point → stripe → lift → layering → peeling.
5. Commonly used plastic mold steel?
45# S50c 718 738 718H 738H P20 2316 8407 H13 NAK80 NAK55 S136 S136H SKD61.
6. What kind of material is used for high mirror polishing?
Commonly used high-hard heat-treated steel, such as: SKD61, 8407, S136.
7. What are the structures of the mold base?
Panel → A plate → B plate → square iron → guide column → thimble plate → thimble fixed plate → bottom plate.
8. What are the basic forms of the parting surface?
Straight → Tilt → Surface → Vertical → Arc Surface.
9, how to hide each other in UG?
ctrL+B or ctrL+shift+B.
10. What are the mold processing machinery and equipment?
Computer 锣 → lathe → milling machine → grinding machine → drilling machine.
11, what is 2D, what is 3D?
The English of D is: the head of Dimension (dimension, 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 view or CAD drawing, and 3D usually refers to the perspective view.
12. What is the default accuracy of pro/e? What is the default accuracy of UG?
The default precision of pro/e is: 0.0012MM, and the default accuracy of UG is: 0.0254MM.
13. What are the top four manufacturers of global formwork production?
Germany: HASCO Japan: FUTABA (double leaf) United States: DME China: LKM (Long Kee).
14. What is the default word height for CAD?
The default font height for CAD is: 2.5MM.
15. What is the wearing and what is the insertion?
The mating surface of the male and female molds parallel to the PL surface is called the bumping surface, and the mating surface of the male and female molds that are not parallel to the PL surface is called the inserting surface.
16, the relationship between the strip and the wire
Both the strip and the silk are length units, the strip is Taiwanese, 1 = 0.01MM, the silk is Hong Kong, 1 silk = 0.01MM, so 1 = 1 silk.
17. What is the pillow position?
The edges of the outer shell plastic parts are often notched and used to install various types of fittings. The pillow-shaped part formed here is called a pillow position.
18. What is the crater?
The shape of the BOOS column root rubber reduction is reflected in the shape of the mold after the volcanic eruption is called the mold crater.
19. What is your finger?
He refers to the model, Hong Kong idioms.
20. What is the tiger's mouth?
The tiger's mouth is also called: the tube position, which is the part used for the limit.
21. What is ranking?
The product layout on the mold is called the ranking.
22. What is the glue position?
The cavity of the product on the mold is called: the glue position.
23, what is the bone position?
The tendons on the product are called: bone position.
24. What is a column?
The column of BOSS on the product is called: column position.
25. What is a virtual position?
The gap on the mold is called: virtual position.
26. What is the deduction?
The hook used to connect the product is called: buckle.
27. What is the fire pattern?
The pattern left after EDM is called a fire pattern.
28. What PL surface?
The PL surface is also called: the parting surface and the rake surface, which refers to the part where the front mold and the rear mold are in contact when the mold is closed.
29. What is the computer?
CNC milling machines and machining centers.
30. What is copper work?
EDM usually uses easy-to-process copper material as the discharge electrode. It is called copper work, also called electrode. Copper work is generally divided into: rough work, rough work, young work, and young workers.
31. What is the spark position usually?
During the discharge process, the discharge gap between the copper and steel materials is called the spark position, the rough spark is generally 10 to 50, and the spark position of the young worker is generally 5 to 15 (welcome to WeChat: Automotive Technician).
32. What is the material level?
The thickness of plastic products is also called thick meat.
33. What is the original body?
The original body is relative to the cutting insert, the original body is a piece of steel for the processing of the billet, processed together when processing.
34. What is the weld line?
The line formed by the encounter of two plastics is called a weld line.
35. What is the jet?
The flow of plastic that forms a curved fold-like snake from the glue inlet into the cavity is called a jet flow.
36. What is LKM?
LKM refers to the dragon record mold embryo, commonly used mold embryos are: LKM, Fu Deba, Mingli, Huansheng, Changhui, Desheng.
37. What does DME mean, what does HASCO mean?
DME and LKM are standard standards, DME is American, and HASCO is European.
38, what is the reverse buckle?
The part of the front and back of the product that cannot be directly demolded becomes an inverted buckle.
39, what is the foolproof?
Defending is to prevent a very simple mistake and prevent daze! For example: an insert has the same size of the hanging platform on the side of the heaven and earth, and it is very likely that the side of the sky will be installed on the side of the assembly, but he is in the insert. On one side, the hanging platform is used. At this time, if the heaven and earth side is not loaded, it is impossible to install it. This kind of action to prevent the occurrence of a daze and a mistake is a daze.
40, what is a beer machine?
The beer machine is a local idiom, which is the injection molding machine and molding machine we often say.
41, what is the stop?
The mouth is the pinch art line, also known as the ugly line.
42. What is a flying model?
The flying mode is the matching die or the standard model.
43. What is a light knife?
The CNC finishing motion is called a light knife, which is to process it in place on an open basis.
44, what is the open box?
The action of machining the position of the mold core on the mold blank is called an open frame.
45, what is the sun word?
The sun type is a processed font that is placed in the film and then added to the font.
46, what is the opposite?
The method of turning the mold before and after the normal mold position is reversed is called reverse.
47, what is floating?
The part that has a partial buckle with a small insert is called a floating method.
48, what is the pre-meal?
When the mold is opened, the product remains in the front mold as the pre-meal mold.
49. What is white?
When the ejection is required, the mold force is large, and the thimble is not enough, so that the product is partially broken. From the front of the product, there is obvious white for the top white, which is also called the top water nozzle.
50, what is baking?
The mark left on the surface of the manufacturing point when diving into the water is called baking.
51, what is the code?
The dowel is a clamping tool, a pad with a triangular beveled open slot.
52, what is called cut?
Overcutting refers to excessive cutting, that is, when machining a workpiece, the part that does not need to be machined is also processed, and overcutting is not good.
53. What is the school cup?
The front mold pops up the inner position of the mold.
54. What is gums?
Tapping. The tapping thread is called the gums.
55. When do you need to make a two-color mold?
Design a two-color mold when a product contains two different materials or different colors from the same material.
56. What is the mold design process of the factory?
Customer provides product map → analysis product → confirm plastic variety → confirm mold material → transfer engineering drawing → take shrinking water as mirror phase → perfect group drawing → order mold embryo → order mold material → draft mode → 3D parting → determine flow path /Gate method→Refer to the layout diagram for structural design→demolition
Inserts → Correction 3D → Project Drawing “Includes: Mold/Inlay/Mold/Distribution†→ Do BOM → Proofreading.
57. How many ways to demould?
Shun and strong off.
58. What are the feeding methods?
Directly enter the glue → lap into the glue → side glue → loop travel glue → sheet into the glue → latent → point into the glue → horn angle into the glue → fan into the glue.
59. What are the forms of the runner?
There are circular flow paths → semi-circular flow paths → T-shaped flow paths → regular hexagonal flow paths.
60, the mold designer's standing manual and books?
Steel books, plastic books, mold standard parts books.
61. What is the role of the spring?
Resilience occurs when external use occurs.
62. Why should the mold be drafted?
Prevents the product from being pulled when it is released.
63. What is the role of the screw and the length of the fit?
Mainly tightening and fixing, the matching length is generally 1.5 to 2 times the diameter of the screw.
64. How big is the slope of the slider? How much is the slope of the inclined guide column?
The slope of the slider is generally taken as: 20 degrees, and the inclination of the inclined guide column is generally 18 degrees.
65, the role of cold wells?
The function of the cold well is to store a small portion of the lower temperature plastic material that first enters the mold.
66, the role of the positioning ring?
The purpose of the positioning ring is to ensure that the correct relative position between the mold and the injection machine is maintained.
67. The relative position of the match?
The cooperation is mainly divided into three categories: clearance coordination, transition coordination, and interference fit.
68. What is the role of the insert?
Convenient processing, prevent carbon deposits, facilitate polishing, save materials, help exhaust, facilitate replacement, and reduce processing machines.
69. What are the indicators of hardness?
Hardness indicates the ability of a material to resist the intrusion of a hard object into its surface. Commonly used hardness indexes are Brinell hardness, Rockwell hardness and Vickers hardness.
70. Can the surface be drafted? Can the group be modeled? Can the quilt be replaced?
The surface cannot be drafted, the surface can be drafted, and the quilt can be replaced.
71. What is the difference between the first corner method and the third angle method?
1. When placing an object in the first quadrant, the method of projecting the view by the relationship of {viewpoint} (observer) → (object) → (projection surface) is called the first corner method, also known as the first quadrant. law.
2. Where the object is placed in the third quadrant, the drawing method is projected by the {viewpoint} (observer) → (projection surface) → (object) relationship, which is called the third angle method, also known as the third quadrant method. .
Note: The difference between the first corner painting and the third corner painting is the article placed by the view.
The first corner drawing: the left view is placed on the right, the right view is placed on the left, the upper view is placed below, and so on...
The third triangle: the left view is placed on the left, the right view is placed on the right, the upper view is placed on the top, and so on...
72. What are the ways to transport water?
Commonly used for transporting water are: straight-through, wraparound, water tower, and spiral.
73. What are the basic principles of the three views?
The basic principle of the three views is: long alignment, high level and width.
74. What are the types of injection machines?
According to the shape: vertical, horizontal, according to injection volume is divided into: ultra-small injection molding machine, small injection molding machine, medium-sized injection molding machine, large injection molding machine, super large injection molding machine. That is, the injection volume ranges from a few milligrams to several tens of kilograms, and is divided into several to several thousand tons according to the clamping force.
75. What is the relationship between clamping force and modulus?
The clamping force of the injection molding machine is greater than the clamping force, otherwise the mold will open the pressure inside the mold.
76. What are the positioning methods of the male and female models?
There are two types of positioning methods for the front and rear modes: one is: template positioning, and the other is: mold positioning.
77. What is the appropriate wall thickness for commonly used plastics?
The suitable wall thickness of ABS is: 1.8-3mm, the suitable wall thickness of PC is: 2-3.5mm, the suitable wall thickness of POM is: 1.5-2.5mm, and the suitable wall thickness of NoryL is: 2-3.5mm.
78, what is the overflow value?
The overflow value refers to the value of the plastic product that overflows under the gap (that is, the running edge).
The overflow value of ABS is 0.04mm.
The overflow value of pc is 0.06mm,
The overflow margin of pA is: 0.015mm,
The appropriate wall thickness for POM is: 0.04mm,
The overflow value of PBT+15%GR is 0.03mm.
The PBT+30% overflow value is 002mm.
The overflow value of PMMA is 0.065mm.
The overflow value of PVC is 0.07mm.
The overflow value of AS is 0.05mm.
The overflow value of ps is 0.05mm.
The overflow value of pp is 0.03mm.
The overflow value of PE is 0.02 mm.
79. How big is the standard frame?
Commonly used frames are: A0, A1, A2, A3, A4, A0 frame size is: 1189mx841m, A1 frame size is: 841mx594mm, A2 frame size is: 594mmx420mm, A3 frame The size is 420mmx297mm, and the size of the frame of A4 is 297mmx210mm.
80. Planning for mold size?
The standard for mold size is different for each company, but the common standards are as follows: the molds of 15-30 series molds are listed as small molds, and the molds of 30-50 series molds are listed as medium molds, and 50 molds. The mold of the embryo is listed as a large mold.
81. What is elastic deformation? What is plastic deformation?
The object is deformed under the action of external force. When the external force disappears, the deformation of the object before the deformation can be called elastic deformation. When the external force disappears, the deformation of the object before the deformation can be called plastic deformation.
82. What materials are commonly used in mold embryos?
The mold core is commonly used in the ace steel (Hong Kong is called the law), the ace is also the medium carbon steel, 45 steel.
83. What is the difference between CAD drawing work model space and layout space?
The model space is the space for the graphic entities, and the layout space is the space for the drawing layout.
84. What is the mold?
In industrial production, metal or non-metal materials are used to produce parts or articles of a desired shape by pressure using various presses and special tools mounted on the press. These special tools are collectively referred to as molds.
85. Classification of molds?
Molds can be generally divided into plastic molds and non-plastic molds. Non-plastic molds include: casting molds, forging molds, stamping molds, die-casting molds, and plastic molds. According to different production processes and production products, they are further divided into: injection molding molds and blowing molds. The compression molding die, the transfer molding die, the extrusion molding die, the thermoforming die, and the rotary forming die can be divided into three types according to the different types of the casting system: a large nozzle mold, a fine nozzle mold, and a hot runner mold.
86, what is the pouring system?
The plastic flow path from the injection nozzle to the cavity is called the gating system. The gating system includes: main flow, split runner, gate and cold well.
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