88 Common Mold Design Knowledge

Today, we talk about engineering is concerning 88 common mold design knowledge points.

Mold design knowledge 1. What are the commonly used plastic engineering materials and shrinkage rates?

ABS: 0.5% (super unbreakable glue)

PC: 0.5% (bulletproof glass glue)

PMMa: 0.5%: (plexiglass)

PE: 2% polyethylene

PS: 0.5%(polyphenylene vinyl)

PP: 2% (Pepto-Bismol)

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

Mold design knowledge 2. How many systems are there in the mold?

Pouring/ejecting/cooling/forming/exhausting

Mold design knowledge 3. What issues should be noted in the process of mold design?

(1) The wall thickness should be as uniform as possible, and the slope of the mold release should be large enough.

(2) Transition part gradually, round and smooth transition, prevent sharp corners.

(3) Gating. The runner should be as wide as possible, thick and short, the location of the gate should be set according to the shrinkage condensation process, and the cold material well should be added if necessary.

(4) Smooth surface of the mold, low roughness (preferably low 0.8)

(5) Ventilation holes, slots must be sufficient to discharge air and gas in the melt in time.

(6) In addition to PET, the wall thickness should not be too thin, generally not less than 1mm.

Mold design knowledge 4. What are the common defects in the obstruction of plastic parts?

Lack of glue cloak bubble shrinkage fusion marks black spot streak warp delamination peeling

Mold design knowledge 5. What is the commonly used plastic mold steel?

45# S50c 718 738 718H

738H P20 2316 8407 H13

NAK80 NAK55 S136 S136H SKD61

Mold design knowledge 6. What kind of outline material is used for high mirror polishing?

Commonly used high hard heat treatment steel, such as SKD61, 8407, S136

Mold design knowledge 7. What is the structure of the die frame?

Panel A plate B plate square iron guide pillar ejector plate ejector pin fixed plate base plate

Mold design knowledge 8. What are the basic forms of parting surface?

Straight / inclined / curved / vertical / curved surface

Mold design knowledge 9. How to hide each other in UG?

ctrL+B or ctrL+shift+B

Mold design knowledge 10. What is the mechanical equipment for mold processing?

Computer gong lathe milling machine grinding machine drilling machine

Mold design knowledge 11. What is 2D and what is 3D?

D English is: Dimension (line degree, dimension) of the prefix, 2D refers to the two-dimensional plane, 3D refers to three-dimensional space, in the mold part, 2D usually refers to the planar drawings that are CAD drawings, 3D usually refers to three-dimensional drawings.

Mold design knowledge 12. What is the default precision of Pro/e and UG?

The default accuracy of pro/e is 0.0012MM, and the default accuracy of UG is 0.0254MM.

Mold design knowledge 13. What are the top four global mold production companies?

Germany: HASCO Japan: FUTABA (Double Leaf) USA: DME China: LKM (Longji)

Mold design knowledge 14. What is the default word height of CAD?

The default word height of CAD is 2.5MM.

Mold design knowledge 15. What is touch through and what is insert through?

The male and female die lamination surface that is parallel to the PL surface is called the touch-through surface, and the male and female die lamination surface that is not parallel to the PL surface is called the insertion surface.

Mold design knowledge 16. Relationship between strips and filaments

Both strip and filament are length units, strip is the term in Taiwan, 1 strip = 0.01MM, filament is the term in Hong Kong, 1 filament = 0.01MM, so 1 strip = 1 filament.

Mold design knowledge 17. What is the pillow position?

The edge of the shell-type plastic parts often has a gap for the installation of various accessories, the pillow-shaped part formed here is called the pillow position.

Mold design knowledge 18. What is the crater?

BOOS pillar root part of the rubber reduction reflected in the mold type after the eruption of the shape is called mold crater.

Mold design knowledge 19. What is the finger?

It refers to the mold kernel, the customary term in Hong Kong.

Mold design knowledge 20. What is tiger mouth?

Tiger mouth is also known as tube position, that is, the part used to limit the position.

Mold design knowledge 21. What do you mean by “alignment”?

The layout of the product on the mold is called the row.

Mold design knowledge 22. What is called glue position?

The cavity of the product on the mold is called: glue position.

Mold design knowledge 23. What is called bone position?

The tendon on the product is called: bone position

Mold design knowledge 24. What is called column position?

The column of the BOSS on the product is called: column position.

Mold design knowledge 25. What do you mean by virtual position?

The gap on the mold is called: a false bit.

Mold design knowledge 26. What do you mean by buckle bit?

The hook on the product for connection is called: buckle a bit.

Mold design knowledge 27. What is called a sparkle pattern?

The pattern left after EDM is called the sparkle pattern.

Mold design knowledge 28. What is PL surface?

PL surface is also called: parting surface, snapping surface, refers to the mold in the closure of the front and rear mold contact part.

Mold design knowledge 29. What is the computer LUO?

CNC milling machine and machining center

Mold design knowledge 30. What is copper work?

EDM usually uses easy-to-process copper material to do the discharge electrode, called copper work, also known as an electrode, copper work is generally divided into rough work, rough young work, young work, young work is also known as fine work.

Mold design knowledge 31. What is the usual spark level?

During the discharge process, the discharge gap between the copper worker and the steel material is called the spark level, the rough work spark is usually between 10 and 50, the young work spark level is usually between 5 and 15 (welcome to follow the WeChat: automotive craftsman).

Mold design knowledge 32. What is the material level?

Plastic products to avoid the thickness, also known as meat thickness.

Mold design knowledge 33. What is the original body stay?

The original body stay is relative to the cut inserts, the original body stay refers to a whole piece of steel for processing embryo, processing together when processing out.

Mold design knowledge 34. What is a fusion mark?

The line formed by the meeting of two strands of plastic is called a fusion mark.

Mold design knowledge 35. What is the jet stream?

The plastic enters the cavity from the glue inlet and forms a curved and folded snake-like flow mark called a jet.

Mold design knowledge 36. What does LKM mean?

LKM refers to Longji mold, commonly used mold: LKM, Fudeba, Mingli, Huansheng, Changhui, Desheng.

Mold design knowledge 37. What does DME mean and what does HASCO mean?

DME and LKM are both standards of standard parts, DME is the American system, HASCO is the European system.

Mold design knowledge 38. What do you mean by inverted buckle?

The part of the product before and after the mold that cannot be directly demolded becomes an inverted buckle.

Mold design knowledge 39. What do you mean by dull-proof?

Anti-dull is a kind of idiom, that is, to prevent a very simple error, to prevent dullness!

For example, an insert has the same size as the hanging table on both the heaven and earthside, when assembling on-site, it is likely that the heaven and earthside will be installed backward, but he is doing hanging table on one side of the insert, at this time.

If the heaven and earthside is installed backward, it can’t be installed, it is impossible to install the wrong one, this kind of action to prevent dumbing down and producing mistakes becomes dumbing down.

Mold design knowledge 40. What do you mean by beer machine?

Beer machine is a local customary term, which is often referred to as injection molding machine, molding machine.

Mold design knowledge 41. What do you mean by stop?

Stop port is the clamping art line, also known as the ugly line.

Mold design knowledge 42. What do you mean by flying mold?

The flying mold is the matching mold or standard mold.

Mold design knowledge 43. What is called a light cutter?

CNC finishing action is called a light cutter, which is processed in place on the basis of the open rough.

Mold design knowledge 44. What do you mean by open frame?

The action of machining the position of the mold kernel on the mold embryo is called opening the frame.

Mold design knowledge 45. What do you mean by “sunlight”?

The word “sun” is put in the film and then take the font to add the processing font.

Mold design knowledge 46. What do you mean by “anti-pattern”?

The method of opening the mold by reversing the position of the front and rear mold material under normal circumstances is called reverse.

Mold design knowledge 47. What do you mean by floating?

Local inverted place using small inserts to pop out of the mold method is called floating.

Mold design knowledge 48. What do you mean by eating the front mold?

When opening the mold, the product stays in the front mold is called eating the front mold.

Mold design knowledge 49. What is called top white?

Top out the required mold force is larger, the ejector is not enough to force so that the product is partially top bad, from the front of the product, there is an obvious white for the top white, also called top high water mouth.

Mold design knowledge 50. What do you mean by baking?

Diving into the water point in the appearance of the surface of the system point left traces called baking marks.

Mold design knowledge 51. What is called code boy?

Code boy belongs to the clamping tool, a triangular beveled open bit slot of the pad.

Mold design knowledge 52. What is called overcutting?

Overcutting means overcutting, that is, machining the part of the workpiece that does not need to be machined, overcutting is bad.

Mold design knowledge 53. What is the school cup?

The front mold pops out the inner line of the mold.

Mold design knowledge 54. What is tooth tapping?

Tapping is called thread tapping.

Mold design knowledge 55. When do I need to make a two-color mold?

When a product contains two different materials or different colors of the same material, design a two-color mold for molding.

Mold design knowledge 56. What is the process of mold design in a factory?

The customer provides product drawing, analyze the product, confirm the plastic species, confirm the mold material, transfer the engineering drawing, take the shrinkage to make the mirror, perfect the assembly drawing, order the mold embryo, mold insert material, mold pulling, 3D parting, determine the flow channel/gating method, refer to the layout drawing for structural design, dismantle the insert correction, 3D engineering drawing “including mold embryo/insert/ mold embryo/ loose parts”, do the BOM table check and audit.

Mold design knowledge 57. How many ways of demoulding?

Smooth and strong stripping

Mold design knowledge 58. What are the ways of glue feeding?

Direct glue feed, lap glue feed, side glue feed, ring glue feed, sheet glue feed, latent point glue feed, bullhorn glue feed, fan glue feed.

Mold design knowledge 59. What are the forms of runners?

There are round runners, semi-round runners, T-shaped runners, and hexagonal runners.

Mold design knowledge 60. What are the common manuals and books for mold designers?

Steel books, plastic books, mold standard parts books.

Mold design knowledge 61. What is the function of spring?

To produce rebound force when external use occurs

Mold design knowledge 62. Why should the mold be pulled?

To prevent the product from being strained when it comes off the mold.

Mold design knowledge 63. What is the role of screws and the determination of the fitting length?

The main role of the screw is to tighten and fix the role, the fitting length is generally 1.5 to 2 times the screw diameter.

Mold design knowledge 64. What is the slope of the slider generally taken, and what is the slope of the inclined guide column generally taken?

The slope of the slider is generally taken as 20 degrees, and the slope of the inclined column is generally taken as 18 degrees.

Mold design knowledge 65. What is the role of the cold material well?

The function of cold material well is: to store the small part of plastic material with lower temperature which enters the mold first.

Mold design knowledge 66. What is the role of the positioning ring?

The purpose of the positioning ring is to ensure that the correct relative position is maintained between the mold and the injection machine.

Mold design knowledge 67. What is the relative position of the fit?

There are three main types of fits: gap fit, transition fit, an interference fit.

Mold design knowledge 68. What is the role of inserts?

To facilitate processing, prevent carbon accumulation, facilitate polishing, save material, help exhaust, facilitate replacement, and reduce the processing machine.

Mold design knowledge 69. What are the indicators of hardness?

Hardness indicates the ability of a material to resist the pressure of a hard object into its surface, and the common indicators of hardness are Brinell, Rockwell, and Vickers.

Mold design knowledge 70. Can a surface be pulled out of a mold? Can groups be pulled? Can a surface group be replaced?

The surface can not be pulled, the group can be pulled, and the group can be replaced.

Mold design knowledge 71. What is the difference between the first angle method and the third angle method?

The first angle method is called the first quadrant method, where the object is placed in the first quadrant and the view is projected in relation to the (observer) (object) (projection surface).

In the third quadrant, the object is placed in the third quadrant, the (observer) (projection surface) (object) relationship and the projection view of the drawing method, that is, the third angle method, also known as the third quadrant method.

Note: The difference between the first and third angle drawing methods is the article of view placement.

The first angle drawing method: 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 corner drawing method: the left view is placed on the left, the right view is placed on the right, the top view is placed on top, and so on…

Mold design knowledge 72. What are the ways to transport water?

Water transport commonly used are: straight through, around the type, water tower type, spiral type.

Mold design knowledge 73. What is the basic principle of the three views?

The basic principles of the three views are length right, height flush, width equal.

Mold design knowledge 74. How many types of injection machines are there?

According to the shape: vertical, horizontal, “the two most commonly used” according to the injection volume: ultra-small injection molding machine, small injection molding machine, medium-sized injection molding machine, large injection molding machine, super-large injection molding machine.

In other words, the injection volume ranges from a few milligrams to tens of kilograms, and the closing force is divided into a few tons to several thousand tons.

Mold design knowledge 75. What is the relationship between clamping force and clamping force?

The clamping force of the injection molding machine should be greater than the clamping force, otherwise, the mold will be opened by the pressure inside the mold.

Mold design knowledge 76. What are the positioning methods of male and female molds?

There are two types of positioning methods for front and rear molds: one is: template positioning and the other is: mold kernel positioning.

Mold design knowledge 77. What is the suitable wall thickness of commonly used plastics?

ABS suitable wall thickness is: 1.8-3mm, PC suitable wall thickness is: 2-3.5mm, POM suitable wall thickness is: 1.5-2.5mm, Noryl suitable wall thickness is: 2-3.5mm

Mold design knowledge 78. What do you mean by the edge of the overflow value?

The overflow value refers to the plastic product is in how big the gap will overflow, (also known as running edge) a value, ABS overflow value: 0.04mm,

PC’s edge spill value: 0.06mm,

The overflow value of PA is 0.015mm.

The appropriate wall thickness of POM is 0.04mm,

For PBT+15%GR: 0.03mm,

For PBT+30% GR: 0.03mm, for PBT+30% GR: 002mm,

For PMMA: 0.065mm,

For PVC: 0.07mm,

For AS: 0.05mm,

For PS: 0.05mm,

The overflow value of pp is 0.03mm,

The overflow value of PE is 0.02mm.

Mold design knowledge 79. What is the size of the standard frame?

Commonly used frames are: A0, A1, A2, A3, A4, the size of A0 frame is: 1189mx841m,

The size of the A1 frame is 841mx594mm,

The size of the frame of A2 is 594mmx420mm,

The size of the frame of A3 is 420mmx297mm,

The size of the A4 frame is 297mmx210mm

Mold design knowledge 80. How to plan the size of the mold?

Each company has different criteria for mold size planning, but the common criteria are as follows: 15-30 series mold germ is classified as small mold, 30-50 series mold germ is classified as medium mold, and over 50 series mold germ is classified as large mold.

Mold design knowledge 81. What is meant by elastic deformation? What is plastic deformation?

When the external force disappears, the object can return to the deformation before the deformation is called elastic deformation, when the external force disappears, the object cannot return to the deformation before the deformation is called plastic deformation.

Mold design knowledge 82. What materials are commonly used for mold bases?

The mold embryo is often made of Wang steel (called in Hong Kong), which is also known as medium carbon steel and 45 steel.

Mold design knowledge 83. What is the difference between the model space and layout space in CAD drawing work?

Model space is the space for graphic entities, and layout space is the space for drawing layout.

Mold design knowledge 84. What is the role of water transportation?

The role of water transportation is: to control the temperature of the mold kernel.

Mold design knowledge 85. What is a mold?

In industrial production, using various presses and special tools mounted on the press, through the pressure of metal or non-metallic materials to produce the required shape of parts or products, this special tool is collectively known as the mold.

Mold design knowledge 86. What is the classification of molds?

Molds can be generally divided into plastic molds and non-plastic molds, non-plastic molds are: casting molds, forging molds, stamping molds, die-casting molds, plastic molds.

According to the different production processes and production, products are divided into injection molding mold, blowing mold, compression molding mold, transfer molding mold, extrusion molding mold, thermoforming mold, rotational molding mold.

According to the different types of pouring systems, the molds can be divided into three categories: large spout molds, fine spout molds, and hot runner molds.

Mold design knowledge 87. What is a pouring system?

The plastic flow channel from the injector nozzle to the cavity is called the pouring system, which includes: the main flow channel, manifold channel, gate, and cold material well.

Mold design knowledge 88. What is reverse engineering?

Reverse engineering is the accurate and high-speed scanning of existing samples or models by the high-speed laser scanning machine, to get its three-dimensional profile data, with the inverse software to reconstruct the curvature, and online accuracy analysis of the reconstructed surface, to evaluate the construction effect, and finally generate IGES or STL data, according to the time can be rapid prototyping or CNC machining.

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